/* =========================================================
   NetCalc Pro — Cisco Professional Dark Theme
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600;700&family=IBM+Plex+Sans:wght@400;500;600;700&display=swap');

:root {
  /* Cisco mavi paleti */
  --cisco-blue: #1BA0D7;
  --cisco-blue-dark: #0D6E96;
  --cisco-blue-light: #5BBEE6;
  --cisco-blue-glow: rgba(27, 160, 215, 0.15);
  --cisco-cyan: #00BCEB;

  /* Dark slate arkaplan katmanları */
  --bg-base: #0A0E14;
  --bg-surface: #11161E;
  --bg-elevated: #161D27;
  --bg-input: #0D1218;
  --bg-hover: #1C2532;

  /* Border'lar */
  --border-subtle: #1E2733;
  --border-default: #2A3544;
  --border-strong: #3D4B5E;
  --border-accent: var(--cisco-blue);

  /* Text */
  --text-primary: #E8EEF5;
  --text-secondary: #9AA8B8;
  --text-tertiary: #5D6B7E;
  --text-mono: #B8D4E5;

  /* Status */
  --status-success: #2ECC71;
  --status-warning: #F39C12;
  --status-error: #E74C3C;
  --status-info: var(--cisco-blue);

  /* Vurgu renkleri (binary highlighting için) */
  --bit-network: #1BA0D7;
  --bit-host: #F39C12;
  --bit-on: #2ECC71;
  --bit-off: #5D6B7E;

  /* Typography */
  --font-mono: 'IBM Plex Mono', 'Consolas', 'Monaco', monospace;
  --font-sans: 'IBM Plex Sans', -apple-system, sans-serif;

  /* Spacing & layout */
  --radius-sm: 3px;
  --radius-md: 5px;
  --radius-lg: 8px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 0 3px var(--cisco-blue-glow);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Subtle grid texture overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(27, 160, 215, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27, 160, 215, 0.025) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  z-index: 0;
}

/* =========================================================
   HEADER / TOPBAR
   ========================================================= */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(180deg, var(--bg-surface) 0%, rgba(17, 22, 30, 0.95) 100%);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-default);
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border: 1.5px solid var(--cisco-blue);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--cisco-blue-glow);
  position: relative;
}

.brand-mark::before,
.brand-mark::after {
  content: '';
  position: absolute;
  background: var(--cisco-blue);
}
.brand-mark::before {
  width: 14px; height: 2px;
  transform: rotate(-45deg);
  top: 14px; left: 8px;
}
.brand-mark::after {
  width: 14px; height: 2px;
  transform: rotate(45deg);
  top: 14px; left: 8px;
}

.brand-name {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.5px;
}

.brand-name .accent { color: var(--cisco-blue); }

.brand-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-tertiary);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  border-left: 1px solid var(--border-default);
  padding-left: 12px;
  margin-left: 4px;
}

.status-dot {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.status-dot::before {
  content: '';
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--status-success);
  box-shadow: 0 0 8px var(--status-success);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* =========================================================
   LAYOUT
   ========================================================= */
.app {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: calc(100vh - 61px);
  position: relative;
  z-index: 1;
}

/* Sidebar tab navigation */
.sidebar {
  background: var(--bg-surface);
  border-right: 1px solid var(--border-default);
  padding: 20px 0;
}

.sidebar-label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-tertiary);
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 0 20px 10px;
}

.tab-button {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
  background: none;
  border: none;
  color: var(--text-secondary);
  padding: 11px 20px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border-left: 2px solid transparent;
  transition: all 0.15s ease;
  text-align: left;
}

.tab-button:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.tab-button.active {
  background: var(--bg-hover);
  color: var(--cisco-blue-light);
  border-left-color: var(--cisco-blue);
  font-weight: 600;
}

.tab-button .tab-icon {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-tertiary);
  width: 24px;
  text-align: center;
}

.tab-button.active .tab-icon { color: var(--cisco-blue); }

/* Content area */
.content {
  padding: 28px 32px;
  overflow-x: auto;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.panel-header {
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.panel-title {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.panel-title::before {
  content: '▸';
  color: var(--cisco-blue);
  font-size: 14px;
}

.panel-subtitle {
  margin-top: 6px;
  font-size: 13px;
  color: var(--text-secondary);
}

/* =========================================================
   FORM ELEMENTS
   ========================================================= */
.input-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: flex-end;
  margin-bottom: 24px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field-label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-tertiary);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  font-weight: 600;
}

.input {
  background: var(--bg-input);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 14px;
  padding: 10px 14px;
  outline: none;
  transition: all 0.15s ease;
  min-width: 200px;
}

.input:focus {
  border-color: var(--cisco-blue);
  box-shadow: var(--shadow-glow);
  background: var(--bg-elevated);
}

.input.error {
  border-color: var(--status-error);
}

.input-cidr {
  width: 90px;
  min-width: unset;
  text-align: center;
}

.input-small {
  width: 120px;
  min-width: unset;
}

select.input {
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  padding-right: 36px;
  background-image: linear-gradient(45deg, transparent 50%, var(--text-tertiary) 50%),
                    linear-gradient(135deg, var(--text-tertiary) 50%, transparent 50%);
  background-position: calc(100% - 18px) 50%, calc(100% - 13px) 50%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  transition: background-image 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

select.input:hover {
  background-image: linear-gradient(45deg, transparent 50%, var(--text-secondary) 50%),
                    linear-gradient(135deg, var(--text-secondary) 50%, transparent 50%);
}

select.input:focus {
  background-image: linear-gradient(45deg, transparent 50%, var(--cisco-blue) 50%),
                    linear-gradient(135deg, var(--cisco-blue) 50%, transparent 50%);
}

.btn {
  background: var(--cisco-blue);
  color: white;
  border: 1px solid var(--cisco-blue);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  padding: 10px 18px;
  cursor: pointer;
  letter-spacing: 1px;
  text-transform: uppercase;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.btn:hover {
  background: var(--cisco-blue-light);
  border-color: var(--cisco-blue-light);
  box-shadow: 0 0 12px var(--cisco-blue-glow);
}

.btn:active { transform: translateY(1px); }

.btn-secondary {
  background: transparent;
  color: var(--cisco-blue-light);
  border-color: var(--border-strong);
}

.btn-secondary:hover {
  background: var(--bg-hover);
  border-color: var(--cisco-blue);
  box-shadow: none;
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: var(--border-default);
}
.btn-ghost:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.btn-danger {
  background: transparent;
  color: var(--status-error);
  border-color: var(--border-default);
  padding: 6px 10px;
  font-size: 11px;
}
.btn-danger:hover { border-color: var(--status-error); }

.error-message {
  color: var(--status-error);
  font-family: var(--font-mono);
  font-size: 12px;
  margin-top: 8px;
  padding: 10px 14px;
  background: rgba(231, 76, 60, 0.08);
  border-left: 2px solid var(--status-error);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  display: none;
}

.error-message.visible { display: block; }

/* =========================================================
   RESULT CARDS
   ========================================================= */
.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 18px;
  position: relative;
  overflow: hidden;
}

.card-accent {
  border-left: 3px solid var(--cisco-blue);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.card-title {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-tertiary);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  font-weight: 600;
}

.card-value {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--text-primary);
  font-weight: 600;
  word-break: break-all;
}

.card-value.large {
  font-size: 22px;
  color: var(--cisco-blue-light);
}

.card-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-tertiary);
  margin-top: 6px;
}

/* =========================================================
   DATA TABLE / DETAIL ROWS
   ========================================================= */
.detail-section {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
}

.detail-header {
  background: var(--bg-elevated);
  padding: 10px 16px;
  border-bottom: 1px solid var(--border-default);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-secondary);
  letter-spacing: 1px;
  text-transform: uppercase;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.detail-header::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--cisco-blue);
  border-radius: 1px;
}

.detail-rows {
  display: grid;
  grid-template-columns: 200px 1fr;
}

.detail-rows > div {
  padding: 9px 16px;
  border-bottom: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 13px;
}

.detail-rows > div:nth-last-child(-n+2) { border-bottom: none; }

.detail-rows > div:nth-child(odd) {
  color: var(--text-tertiary);
  background: var(--bg-elevated);
  font-size: 11px;
  letter-spacing: 1px;
  text-transform: uppercase;
  font-weight: 600;
}

.detail-rows > div:nth-child(even) {
  color: var(--text-mono);
  word-break: break-all;
}

/* Binary representation styling */
.binary-display {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
}

.binary-octet {
  display: flex;
  align-items: center;
}

.binary-bit {
  display: inline-block;
  width: 1ch;
  text-align: center;
  transition: color 0.15s ease;
}

.binary-bit.network { color: var(--bit-network); font-weight: 700; }
.binary-bit.host    { color: var(--bit-host); }
.binary-dot { color: var(--text-tertiary); margin: 0 2px; }

.copy-btn {
  background: transparent;
  border: 1px solid var(--border-default);
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
  letter-spacing: 0.5px;
}

.copy-btn:hover {
  border-color: var(--cisco-blue);
  color: var(--cisco-blue-light);
}

.copy-btn.copied {
  border-color: var(--status-success);
  color: var(--status-success);
}

/* =========================================================
   VLSM TABLE
   ========================================================= */
.vlsm-requirements {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 16px;
}

.vlsm-row {
  display: grid;
  grid-template-columns: 1fr 140px 40px;
  gap: 10px;
  margin-bottom: 8px;
  align-items: center;
}

.vlsm-row .input { min-width: unset; width: 100%; }

.vlsm-add {
  margin-top: 12px;
  display: flex;
  gap: 10px;
}

table.results-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.results-table thead {
  background: var(--bg-elevated);
}

.results-table th {
  text-align: left;
  padding: 11px 14px;
  font-size: 10px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-tertiary);
  font-weight: 600;
  border-bottom: 1px solid var(--border-default);
  white-space: nowrap;
}

.results-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-mono);
}

.results-table tbody tr:last-child td { border-bottom: none; }

.results-table tbody tr:hover { background: var(--bg-hover); }

.results-table .row-error td {
  color: var(--status-error);
  background: rgba(231, 76, 60, 0.04);
}

.cidr-pill {
  display: inline-block;
  padding: 2px 8px;
  background: var(--cisco-blue-glow);
  color: var(--cisco-blue-light);
  border-radius: 10px;
  font-size: 11px;
  font-weight: 600;
}

/* Summary line */
.summary-bar {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  margin-bottom: 16px;
}

.summary-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.summary-stat .label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-tertiary);
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

.summary-stat .value {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--text-primary);
  font-weight: 600;
}

.summary-stat .value.accent { color: var(--cisco-blue-light); }

/* Multi-input area */
.textarea-input {
  width: 100%;
  min-height: 120px;
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--bg-input);
  color: var(--text-mono);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  resize: vertical;
  outline: none;
  transition: all 0.15s ease;
  line-height: 1.7;
}

.textarea-input:focus {
  border-color: var(--cisco-blue);
  box-shadow: var(--shadow-glow);
}

/* Hint */
.hint {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-tertiary);
  margin-top: 6px;
}
.hint code {
  background: var(--bg-elevated);
  padding: 1px 6px;
  border-radius: 2px;
  color: var(--cisco-blue-light);
}

/* Empty state */
.empty-state {
  padding: 40px 20px;
  text-align: center;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  font-size: 13px;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-default);
  padding: 14px 24px;
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-tertiary);
  letter-spacing: 1px;
  text-transform: uppercase;
  background: var(--bg-surface);
}

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }
  .sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border-default);
    padding: 12px 0;
    display: flex;
    overflow-x: auto;
  }
  .sidebar-label { display: none; }
  .tab-button {
    border-left: none;
    border-bottom: 2px solid transparent;
    padding: 10px 14px;
    flex-shrink: 0;
  }
  .tab-button.active {
    border-left: none;
    border-bottom-color: var(--cisco-blue);
  }
  .content { padding: 20px 16px; }
  .detail-rows { grid-template-columns: 1fr; }
  .detail-rows > div:nth-child(odd) { padding-bottom: 4px; }
  .detail-rows > div:nth-child(even) { padding-top: 4px; padding-bottom: 12px; }
  .topbar { padding: 12px 16px; }
  .brand-tag { display: none; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: var(--cisco-blue-dark); }

/* Selection */
::selection { background: var(--cisco-blue); color: white; }

/* ============================================================
   MOBILE BREAKPOINTS — 3 kademe (Tablet / Mobile / XS)
   ============================================================ */

/* Mobile (≤ 640px) */
@media (max-width: 640px) {
  body { font-size: 13px; }

  /* iOS Safari input zoom önleme — minimum 16px gerekli */
  .input, .textarea-input, select.input { font-size: 16px; }

  .topbar { padding: 10px 14px; }
  .brand-name { font-size: 13px; }
  .brand-mark { width: 28px; height: 28px; }
  .brand-mark::before, .brand-mark::after { width: 12px; top: 12px; left: 8px; }
  .status-dot { font-size: 10px; }

  .content { padding: 16px 12px; }
  .panel-header { margin-bottom: 18px; padding-bottom: 12px; }
  .panel-title { font-size: 15px; }
  .panel-subtitle { font-size: 12px; }

  /* Input grupları dikey stack */
  .input-group { flex-direction: column; align-items: stretch; gap: 10px; }
  .input-group .field { width: 100%; }
  .input-group .input,
  .input-group select.input { width: 100%; min-width: 0; }
  .input-group .btn { width: 100%; padding: 14px 18px; }

  /* CIDR input mobilde dar */
  .input-cidr { width: 100% !important; max-width: 140px; }
  .input-small { width: 100%; }

  /* Sonuç kartları tek sütun */
  .result-grid { grid-template-columns: 1fr; gap: 10px; }
  .card { padding: 14px; }
  .card-value { font-size: 15px; }
  .card-value.large { font-size: 18px; }
  .card-sub { font-size: 10px; }

  .detail-rows > div { padding: 8px 12px; font-size: 12px; }
  .detail-rows > div:nth-child(odd) { font-size: 10px; padding-bottom: 4px; }
  .detail-rows > div:nth-child(even) { padding-top: 4px; padding-bottom: 10px; }

  .binary-display { font-size: 11px; gap: 4px; }
  .binary-bit { width: 0.9ch; }

  /* VLSM satırları dikey stack */
  .vlsm-row {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 10px;
    background: var(--bg-elevated);
    border-radius: var(--radius-sm);
    margin-bottom: 10px;
  }
  .vlsm-row .btn-danger { width: 100%; padding: 8px; font-size: 11px; }
  .vlsm-add { flex-direction: column; gap: 8px; }
  .vlsm-add .btn { width: 100%; }

  .summary-bar { gap: 12px; padding: 12px; }
  .summary-stat .value { font-size: 14px; }
  .summary-stat .label { font-size: 9px; }

  .results-table { font-size: 11px; }
  .results-table th, .results-table td { padding: 8px 10px; }

  /* Touch target'lar — min 36-44px */
  .btn { padding: 12px 18px; min-height: 40px; }
  .btn-danger { min-height: 36px; min-width: 36px; }
  .copy-btn { padding: 6px 10px; font-size: 11px; min-height: 28px; }
  .tab-button { min-height: 44px; padding: 12px 16px; }

  pre { font-size: 11px !important; padding: 12px !important; overflow-x: auto; }

  .footer { padding: 10px 14px; font-size: 9px; flex-direction: column; gap: 4px; text-align: center; }
}

/* Extra small (≤ 380px — iPhone SE, eski cihazlar) */
@media (max-width: 380px) {
  .topbar { padding: 8px 10px; }
  .content { padding: 12px 8px; }
  .brand-name { font-size: 12px; letter-spacing: 0.3px; }
  .panel-title { font-size: 14px; }
  .binary-display { font-size: 10px; }
  .card-value.large { font-size: 16px; }
}

/* ============================================================
   OPTION 43 — Mode toggle ve TLV chips
   ============================================================ */

.mode-toggle {
  display: flex;
  gap: 4px;
  background: var(--bg-elevated);
  padding: 4px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
  margin-bottom: 20px;
  width: fit-content;
}

.mode-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  letter-spacing: 1px;
  text-transform: uppercase;
  transition: all 0.2s ease;
}

.mode-btn.active {
  background: var(--cisco-blue);
  color: white;
}

.mode-btn:hover:not(.active) {
  color: var(--text-primary);
  background: var(--bg-hover);
}

@media (max-width: 640px) {
  .mode-toggle { width: 100%; }
  .mode-btn { flex: 1; padding: 10px 8px; font-size: 10px; }
}

.tlv-byte {
  display: inline-block;
  padding: 6px 10px;
  margin: 0 3px 4px 0;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 13px;
  border: 1px solid var(--border-default);
  letter-spacing: 0.5px;
  font-family: var(--font-mono);
}
.tlv-type   { background: rgba(27,160,215,0.15); color: var(--cisco-blue-light); border-color: var(--cisco-blue); }
.tlv-length { background: rgba(243,156,18,0.12); color: var(--status-warning); border-color: var(--status-warning); }
.tlv-value  { background: rgba(46,204,113,0.10); color: var(--status-success); border-color: rgba(46,204,113,0.4); }

/* ============================================================
   ANIMATIONS
   ============================================================ */

@keyframes slideInUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.96); }
  to   { opacity: 1; transform: scale(1); }
}

@keyframes statusPulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 8px var(--status-success); }
  50%      { opacity: 0.5; box-shadow: 0 0 4px var(--status-success); }
}

/* Tab panel geçişi */
.tab-panel.active {
  animation: slideInUp 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Sonuç kartları staggered */
.result-grid .card {
  animation: scaleIn 0.3s cubic-bezier(0.4, 0, 0.2, 1) backwards;
}
.result-grid .card:nth-child(1) { animation-delay: 0.05s; }
.result-grid .card:nth-child(2) { animation-delay: 0.10s; }
.result-grid .card:nth-child(3) { animation-delay: 0.15s; }
.result-grid .card:nth-child(4) { animation-delay: 0.20s; }

/* Detail section staggered */
.detail-section {
  animation: slideInUp 0.3s cubic-bezier(0.4, 0, 0.2, 1) backwards;
}
.detail-section:nth-of-type(1) { animation-delay: 0.10s; }
.detail-section:nth-of-type(2) { animation-delay: 0.18s; }
.detail-section:nth-of-type(3) { animation-delay: 0.26s; }
.detail-section:nth-of-type(4) { animation-delay: 0.34s; }
.detail-section:nth-of-type(5) { animation-delay: 0.42s; }

/* Card hover efekti */
.card {
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}
.card.card-accent:hover {
  border-left-color: var(--cisco-blue-light);
  box-shadow: 0 4px 20px var(--cisco-blue-glow);
}

/* Buton ripple efekti */
.btn {
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}
.btn::after {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  width: 0; height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.25);
  transform: translate(-50%, -50%);
  transition: width 0.45s ease, height 0.45s ease;
  pointer-events: none;
}
.btn:active::after { width: 240px; height: 240px; }

/* Tablo satır geçişi */
.results-table tbody tr {
  transition: background 0.15s ease;
}

/* Brand mark hover'da dön */
.brand-mark {
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), background 0.2s ease;
}
.brand:hover .brand-mark {
  transform: rotate(45deg);
  background: rgba(27, 160, 215, 0.25);
}

/* Tab button geçişi */
.tab-button {
  transition: all 0.2s ease;
}

/* Input focus geçişi */
.input, .textarea-input, select.input {
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

/* Copy button feedback */
.copy-btn { transition: all 0.15s ease; }
.copy-btn.copied { animation: scaleIn 0.2s ease; }

/* Status dot — daha smooth pulsing */
.status-dot::before { animation: statusPulse 2.4s ease-in-out infinite; }

/* TLV byte chip'leri sıralı görünür */
.tlv-byte {
  animation: scaleIn 0.25s cubic-bezier(0.34, 1.56, 0.64, 1) backwards;
}
.tlv-byte:nth-child(1)  { animation-delay: 0.05s; }
.tlv-byte:nth-child(2)  { animation-delay: 0.10s; }
.tlv-byte:nth-child(3)  { animation-delay: 0.15s; }
.tlv-byte:nth-child(4)  { animation-delay: 0.20s; }
.tlv-byte:nth-child(5)  { animation-delay: 0.25s; }
.tlv-byte:nth-child(6)  { animation-delay: 0.30s; }
.tlv-byte:nth-child(7)  { animation-delay: 0.35s; }
.tlv-byte:nth-child(8)  { animation-delay: 0.40s; }
.tlv-byte:nth-child(9)  { animation-delay: 0.45s; }
.tlv-byte:nth-child(10) { animation-delay: 0.50s; }

/* Mode button geçişi */
.mode-btn { transition: all 0.2s ease; }

/* Reduced motion — erişilebilirlik */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================================
   REFERENCE BLOCKS (inline, her tab'ın altında)
   ============================================================ */

.reference-block {
  margin-top: 32px;
  padding: 18px 20px;
  background: linear-gradient(180deg, var(--bg-surface) 0%, rgba(17, 22, 30, 0.6) 100%);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--cisco-blue-dark);
}

.reference-block-title {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-tertiary);
  font-weight: 700;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.reference-block-title::before {
  content: '§';
  color: var(--cisco-blue);
  font-size: 14px;
  font-weight: 400;
}

.reference-block-text {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.reference-block-text code {
  background: var(--bg-elevated);
  padding: 1px 6px;
  border-radius: 2px;
  color: var(--cisco-blue-light);
  font-family: var(--font-mono);
  font-size: 12px;
}

.reference-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.reference-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 11px;
  background: var(--bg-input);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.5px;
  transition: all 0.2s ease;
}

.reference-link::before {
  content: '↗';
  color: var(--cisco-blue);
  font-size: 12px;
}

.reference-link:hover {
  border-color: var(--cisco-blue);
  color: var(--cisco-blue-light);
  background: var(--bg-hover);
  transform: translateY(-1px);
}

.reference-link .tag {
  display: inline-block;
  padding: 1px 5px;
  background: var(--cisco-blue-glow);
  color: var(--cisco-blue-light);
  border-radius: 2px;
  font-size: 9px;
  font-weight: 700;
  margin-left: 4px;
}

@media (max-width: 640px) {
  .reference-block { padding: 14px 16px; margin-top: 24px; }
  .reference-block-text { font-size: 12px; }
  .reference-link { font-size: 10px; padding: 5px 9px; }
}

/* ============================================================
   REFERENCES TAB
   ============================================================ */

.ref-section-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--cisco-blue-light);
  font-weight: 700;
  margin: 32px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  gap: 10px;
}

.ref-section-title::before {
  content: '';
  width: 4px; height: 14px;
  background: var(--cisco-blue);
  border-radius: 1px;
}

.ref-section-title:first-of-type { margin-top: 8px; }

.ref-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 14px;
}

.ref-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  position: relative;
  overflow: hidden;
}

.ref-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 3px; height: 100%;
  background: var(--cisco-blue);
  opacity: 0.6;
  transition: opacity 0.2s ease, width 0.2s ease;
}

.ref-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.ref-card:hover::before { opacity: 1; width: 4px; }

.ref-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.ref-badge {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  font-weight: 700;
  background: var(--cisco-blue-glow);
  color: var(--cisco-blue-light);
  padding: 3px 8px;
  border-radius: 2px;
  border: 1px solid var(--cisco-blue-dark);
  white-space: nowrap;
}

.ref-card-title {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.ref-card-body {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.55;
  flex: 1;
}

.ref-card-body code {
  background: var(--bg-elevated);
  padding: 1px 5px;
  border-radius: 2px;
  color: var(--cisco-blue-light);
  font-family: var(--font-mono);
  font-size: 11px;
}

.ref-card-footer {
  margin-top: 4px;
  padding-top: 10px;
  border-top: 1px solid var(--border-subtle);
}

.ref-card-link {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-tertiary);
  text-decoration: none;
  letter-spacing: 0.5px;
  transition: color 0.2s ease;
}

.ref-card-link:hover { color: var(--cisco-blue-light); }

.ref-cheatsheet {
  margin-top: 6px;
}

/* Sidebar divider */
.sidebar-divider {
  height: 1px;
  background: var(--border-subtle);
  margin: 8px 16px;
}

/* References mobile */
@media (max-width: 640px) {
  .ref-grid { grid-template-columns: 1fr; gap: 10px; }
  .ref-section-title { margin: 24px 0 10px; font-size: 10px; }
  .ref-card { padding: 14px; }
  .ref-card-title { font-size: 13px; }
  .ref-card-body { font-size: 12px; }
}

/* References staggered animation */
.ref-grid .ref-card {
  animation: scaleIn 0.3s cubic-bezier(0.4, 0, 0.2, 1) backwards;
}
.ref-grid .ref-card:nth-child(1) { animation-delay: 0.05s; }
.ref-grid .ref-card:nth-child(2) { animation-delay: 0.10s; }
.ref-grid .ref-card:nth-child(3) { animation-delay: 0.15s; }
.ref-grid .ref-card:nth-child(4) { animation-delay: 0.20s; }
.ref-grid .ref-card:nth-child(5) { animation-delay: 0.25s; }
.ref-grid .ref-card:nth-child(6) { animation-delay: 0.30s; }

/* ============================================================
   OPTION 43 — Görsel hex breakdown
   ============================================================ */

.opt43-main-card {
  grid-column: 1 / -1;
  padding: 22px 24px !important;
}

.opt43-hex-display {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 1px;
  margin: 12px 0;
  align-items: center;
}

.hex-group {
  display: inline-block;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid;
  background: rgba(0, 0, 0, 0.2);
  cursor: help;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.hex-group:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.hex-type {
  background: rgba(27, 160, 215, 0.18);
  color: var(--cisco-blue-light);
  border-color: var(--cisco-blue);
}

.hex-length {
  background: rgba(243, 156, 18, 0.15);
  color: var(--status-warning);
  border-color: var(--status-warning);
}

.hex-ip-1 {
  background: rgba(46, 204, 113, 0.12);
  color: #5DD89E;
  border-color: rgba(46, 204, 113, 0.5);
}

.hex-ip-2 {
  background: rgba(155, 89, 182, 0.15);
  color: #B68FD0;
  border-color: rgba(155, 89, 182, 0.5);
}

.hex-ip-3 {
  background: rgba(231, 76, 60, 0.12);
  color: #EC8A7E;
  border-color: rgba(231, 76, 60, 0.5);
}

.hex-ip-4 {
  background: rgba(241, 196, 15, 0.12);
  color: #F4D360;
  border-color: rgba(241, 196, 15, 0.5);
}

.opt43-cli-snippet {
  display: inline-block;
  margin-top: 8px;
  padding: 6px 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  color: var(--text-mono);
  font-family: var(--font-mono);
  font-size: 12px;
}

.opt43-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-tertiary);
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  border: 1px solid;
}

.legend-type {
  background: rgba(27, 160, 215, 0.4);
  border-color: var(--cisco-blue);
}

.legend-length {
  background: rgba(243, 156, 18, 0.4);
  border-color: var(--status-warning);
}

.legend-ip-1 { background: rgba(46, 204, 113, 0.4); border-color: rgba(46, 204, 113, 0.7); }
.legend-ip-2 { background: rgba(155, 89, 182, 0.4); border-color: rgba(155, 89, 182, 0.7); }
.legend-ip-3 { background: rgba(231, 76, 60, 0.4); border-color: rgba(231, 76, 60, 0.7); }
.legend-ip-4 { background: rgba(241, 196, 15, 0.4); border-color: rgba(241, 196, 15, 0.7); }

/* ============================================================
   Per-IP Breakdown Cards
   ============================================================ */

.ip-breakdown-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 14px;
  padding: 16px;
}

.ip-breakdown-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-left: 3px solid;
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.ip-breakdown-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.3);
}

.ip-breakdown-1 { border-left-color: rgba(46, 204, 113, 0.8); }
.ip-breakdown-2 { border-left-color: rgba(155, 89, 182, 0.8); }
.ip-breakdown-3 { border-left-color: rgba(231, 76, 60, 0.8); }
.ip-breakdown-4 { border-left-color: rgba(241, 196, 15, 0.8); }

.ip-breakdown-header {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
}

.ip-breakdown-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-tertiary);
  font-weight: 700;
  letter-spacing: 1px;
}

.ip-breakdown-ip {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}

.ip-breakdown-conversion {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}

.octet-pair {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 8px 4px;
  background: var(--bg-base);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

.octet-dec {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text-primary);
  font-weight: 600;
}

.octet-arrow {
  font-size: 9px;
  color: var(--text-tertiary);
  line-height: 1;
}

.octet-hex {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cisco-blue-light);
  font-weight: 700;
  background: var(--cisco-blue-glow);
  padding: 2px 6px;
  border-radius: 2px;
  min-width: 28px;
  text-align: center;
}

.ip-breakdown-result {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
}

.ip-breakdown-label {
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 10px;
  font-weight: 700;
}

.ip-breakdown-result code {
  background: var(--bg-base);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-default);
  color: var(--text-mono);
  letter-spacing: 0.5px;
}

@media (max-width: 640px) {
  .opt43-main-card { padding: 16px !important; }
  .opt43-hex-display {
    font-size: 14px;
    gap: 4px;
  }
  .hex-group { padding: 5px 8px; }

  .opt43-legend {
    gap: 8px;
    font-size: 10px;
  }

  .ip-breakdown-grid {
    grid-template-columns: 1fr;
    padding: 12px;
    gap: 10px;
  }

  .ip-breakdown-conversion {
    gap: 4px;
  }

  .octet-pair {
    padding: 6px 2px;
  }

  .octet-dec { font-size: 12px; }
  .octet-hex { font-size: 11px; min-width: 24px; }

  .ip-breakdown-ip { font-size: 14px; }

  .opt43-cli-snippet {
    font-size: 11px;
    word-break: break-all;
  }
}

@media (max-width: 380px) {
  .opt43-hex-display { font-size: 12px; }
  .hex-group { padding: 4px 6px; }
}

.hex-group {
  animation: scaleIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1) backwards;
}
.hex-group:nth-child(1) { animation-delay: 0.05s; }
.hex-group:nth-child(2) { animation-delay: 0.10s; }
.hex-group:nth-child(3) { animation-delay: 0.15s; }
.hex-group:nth-child(4) { animation-delay: 0.20s; }
.hex-group:nth-child(5) { animation-delay: 0.25s; }
.hex-group:nth-child(6) { animation-delay: 0.30s; }
.hex-group:nth-child(7) { animation-delay: 0.35s; }
.hex-group:nth-child(8) { animation-delay: 0.40s; }

.ip-breakdown-card {
  animation: slideInUp 0.3s cubic-bezier(0.4, 0, 0.2, 1) backwards;
}
.ip-breakdown-card:nth-child(1) { animation-delay: 0.10s; }
.ip-breakdown-card:nth-child(2) { animation-delay: 0.18s; }
.ip-breakdown-card:nth-child(3) { animation-delay: 0.26s; }
.ip-breakdown-card:nth-child(4) { animation-delay: 0.34s; }

/* ============================================================
   UTILITY CLASSES (replaces inline style.cssText)
   ============================================================ */

.calc-form { display: contents; }

.code-block {
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-mono);
  margin: 0;
  white-space: pre-wrap;
  overflow-x: auto;
}

.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.table-flush {
  border-radius: 0;
}

.copy-btn-margin {
  margin: 10px 16px;
}

.scrollable-output {
  max-height: 400px;
  overflow-y: auto;
}

.legend-row {
  padding: 10px 16px;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 11px;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.warning-banner {
  padding: 10px 14px;
  background: rgba(243, 156, 18, 0.08);
  border-left: 2px solid var(--status-warning);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 12px;
}

.success-banner {
  padding: 18px;
  background: rgba(46, 204, 113, 0.08);
  border: 1px solid rgba(46, 204, 113, 0.3);
  border-radius: var(--radius-md);
  color: var(--status-success);
  font-family: var(--font-mono);
  font-size: 13px;
}

.input-large-min { min-width: 280px; }
.input-medium-min { min-width: 200px; }
.input-stretchy { flex: 1; min-width: 250px; }

.tlv-container {
  padding: 16px;
  font-family: var(--font-mono);
}

.tlv-bytes-row {
  margin-bottom: 12px;
  line-height: 2.2;
}

.tlv-legend {
  font-size: 11px;
  color: var(--text-tertiary);
  display: grid;
  gap: 4px;
}

.tlv-legend-dot { display: inline-block; }
.tlv-legend-dot.t { color: var(--cisco-blue-light); }
.tlv-legend-dot.l { color: var(--status-warning); }
.tlv-legend-dot.v { color: var(--status-success); }

.status-warn { color: var(--status-warning); }
.status-ok   { color: var(--status-success); }
.summary-stat .value.warn { color: var(--status-warning); }
.summary-stat .value.success { color: var(--status-success); }
.cell-sub { font-size: 10px; color: var(--text-tertiary); }
.cidr-pill.danger { background: rgba(231,76,60,0.15); color: #EC8A7E; }
.cidr-pill.warning { background: rgba(243,156,18,0.15); color: #F4D360; }

/* ============================================================
   TOPBAR ACTIONS (share, theme, help)
   ============================================================ */

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.share-btn {
  background: transparent;
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  letter-spacing: 1px;
  text-transform: uppercase;
  transition: all 0.2s ease;
}
.share-btn:hover {
  border-color: var(--cisco-blue);
  color: var(--cisco-blue-light);
  background: var(--bg-hover);
}

@media (max-width: 640px) {
  .share-btn span { display: none; }
  .share-btn::before { content: '↗'; font-size: 14px; }
}

.theme-btn {
  width: 28px;
  height: 28px;
  background: transparent;
  border: 1px solid var(--border-default);
  border-radius: 50%;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 14px;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.theme-btn:hover {
  border-color: var(--cisco-blue);
  color: var(--cisco-blue-light);
  transform: rotate(180deg);
}

.help-btn {
  width: 24px;
  height: 24px;
  background: transparent;
  border: 1px solid var(--border-default);
  border-radius: 50%;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.help-btn:hover {
  border-color: var(--cisco-blue);
  color: var(--cisco-blue-light);
}

/* ============================================================
   COMMAND PALETTE / SHORTCUTS
   ============================================================ */

@keyframes overlayFadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.shortcut-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 15vh;
  animation: overlayFadeIn 0.15s ease;
}

.shortcut-palette {
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  width: 90%;
  max-width: 480px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
  overflow: hidden;
  animation: scaleIn 0.18s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.shortcut-search {
  width: 100%;
  background: var(--bg-input);
  border: none;
  border-bottom: 1px solid var(--border-default);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 14px;
  padding: 14px 18px;
  outline: none;
}

.shortcut-list {
  max-height: 320px;
  overflow-y: auto;
}

.shortcut-item {
  padding: 10px 18px;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 1px solid var(--border-subtle);
  transition: all 0.1s ease;
}
.shortcut-item:hover, .shortcut-item.active {
  background: var(--bg-hover);
  color: var(--cisco-blue-light);
}

.shortcut-help { padding: 24px; }

.shortcut-help-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--cisco-blue-light);
  margin-bottom: 16px;
  font-weight: 700;
}

.shortcut-help-list {
  display: grid;
  gap: 10px;
}

.shortcut-help-list > div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--text-secondary);
}

.shortcut-help-list kbd {
  display: inline-block;
  padding: 3px 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-bottom-width: 2px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cisco-blue-light);
  margin: 0 2px;
}

.shortcut-help-close {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-tertiary);
  text-align: center;
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* ============================================================
   LIGHT THEME — Professional, soft, modern
   Inspired by Linear, Stripe, Cisco DNA Center
   ============================================================ */

:root[data-theme="light"] {
  /* Backgrounds — soft slate-blue tinted whites with proper hierarchy */
  --bg-base: #EAEFF6;
  --bg-surface: #FFFFFF;
  --bg-elevated: #F2F5FA;
  --bg-input: #FFFFFF;
  --bg-hover: #E2E8F2;

  /* Borders — subtle but visible */
  --border-subtle: #DCE3EE;
  --border-default: #C5CFDD;
  --border-strong: #9FAEC4;

  /* Text — high contrast but not pure black */
  --text-primary: #0F1A2E;
  --text-secondary: #4A5874;
  --text-tertiary: #8B97AD;
  --text-mono: #1E2A44;

  /* Cisco blue — slightly darker for AAA contrast on white */
  --cisco-blue: #0E7BB0;
  --cisco-blue-dark: #095B85;
  --cisco-blue-light: #1A8FC9;
  --cisco-blue-glow: rgba(14, 123, 176, 0.10);

  /* Status — adjusted for light visibility */
  --status-success: #0F8A55;
  --status-warning: #C77A0F;
  --status-error: #C73428;

  /* Bit colors — slightly desaturated for light */
  --bit-network: #0E7BB0;
  --bit-host: #C77A0F;

  /* Layered shadows for proper depth */
  --shadow-sm: 0 1px 3px rgba(15, 26, 46, 0.06), 0 1px 2px rgba(15, 26, 46, 0.04);
  --shadow-md: 0 4px 14px rgba(15, 26, 46, 0.10), 0 2px 6px rgba(15, 26, 46, 0.05);
  --shadow-lg: 0 12px 32px rgba(15, 26, 46, 0.12), 0 4px 12px rgba(15, 26, 46, 0.06);
  --shadow-glow: 0 0 0 3px var(--cisco-blue-glow);
}

/* Body grid texture — much softer */
[data-theme="light"] body::before {
  background-image:
    linear-gradient(rgba(14, 123, 176, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14, 123, 176, 0.035) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.8;
}

/* Topbar — frosted glass effect */
[data-theme="light"] .topbar {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: 0 1px 2px rgba(15, 26, 46, 0.03);
}

[data-theme="light"] .brand-mark {
  background: linear-gradient(135deg, rgba(14, 123, 176, 0.10), rgba(14, 123, 176, 0.04));
  border-color: rgba(14, 123, 176, 0.35);
}

[data-theme="light"] .brand-tag {
  border-left-color: var(--border-default);
}

/* Status dot pulsing — softer */
[data-theme="light"] .status-dot::before {
  box-shadow: 0 0 6px var(--status-success);
}

/* ============ Sidebar ============ */
[data-theme="light"] .sidebar {
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
}

[data-theme="light"] .tab-button {
  color: var(--text-secondary);
}

[data-theme="light"] .tab-button:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

[data-theme="light"] .tab-button.active {
  background: var(--cisco-blue-glow);
  color: var(--cisco-blue-dark);
  border-left-color: var(--cisco-blue);
}

[data-theme="light"] .tab-button.active .tab-icon {
  color: var(--cisco-blue);
}

[data-theme="light"] .sidebar-divider {
  background: var(--border-subtle);
}

/* ============ Cards ============ */
[data-theme="light"] .card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
}

[data-theme="light"] .card:hover {
  border-color: var(--border-default);
  box-shadow: 0 6px 20px rgba(15, 26, 46, 0.12), 0 2px 6px rgba(15, 26, 46, 0.06);
  transform: translateY(-2px);
}

[data-theme="light"] .card.card-accent:hover {
  box-shadow: 0 6px 20px rgba(14, 123, 176, 0.18), 0 2px 8px rgba(15, 26, 46, 0.06);
  border-left-color: var(--cisco-blue);
}

[data-theme="light"] .card-value.large {
  color: var(--cisco-blue-dark);
}

/* ============ Detail sections ============ */
[data-theme="light"] .detail-section {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
}

[data-theme="light"] .detail-header {
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

[data-theme="light"] .detail-header::before {
  background: var(--cisco-blue);
}

[data-theme="light"] .detail-rows > div:nth-child(odd) {
  background: var(--bg-elevated);
  color: var(--text-tertiary);
  border-bottom-color: var(--border-subtle);
}

[data-theme="light"] .detail-rows > div:nth-child(even) {
  color: var(--text-mono);
  background: var(--bg-surface);
  border-bottom-color: var(--border-subtle);
}

/* ============ Forms ============ */
[data-theme="light"] .input,
[data-theme="light"] .textarea-input,
[data-theme="light"] select.input {
  background: var(--bg-input);
  border: 1px solid var(--border-default);
  color: var(--text-primary);
  box-shadow: 0 1px 2px rgba(15, 26, 46, 0.03);
}

[data-theme="light"] .input:hover,
[data-theme="light"] .textarea-input:hover {
  border-color: var(--border-strong);
}

[data-theme="light"] .input:focus,
[data-theme="light"] .textarea-input:focus,
[data-theme="light"] select.input:focus {
  border-color: var(--cisco-blue);
  box-shadow: 0 0 0 3px var(--cisco-blue-glow), 0 1px 2px rgba(15, 26, 46, 0.04);
  background: var(--bg-input);
}

[data-theme="light"] .field-label {
  color: var(--text-tertiary);
}

[data-theme="light"] .hint {
  color: var(--text-tertiary);
}

[data-theme="light"] .hint code {
  background: var(--bg-elevated);
  color: var(--cisco-blue-dark);
  border: 1px solid var(--border-subtle);
}

/* ============ Buttons ============ */
[data-theme="light"] .btn {
  background: var(--cisco-blue);
  color: white;
  border: 1px solid var(--cisco-blue);
  box-shadow: 0 1px 2px rgba(14, 123, 176, 0.20), inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

[data-theme="light"] .btn:hover {
  background: var(--cisco-blue-dark);
  border-color: var(--cisco-blue-dark);
  box-shadow: 0 4px 12px rgba(14, 123, 176, 0.25);
}

[data-theme="light"] .btn-secondary {
  background: var(--bg-surface);
  color: var(--cisco-blue);
  border-color: var(--border-default);
  box-shadow: var(--shadow-sm);
}

[data-theme="light"] .btn-secondary:hover {
  background: var(--bg-hover);
  border-color: var(--cisco-blue);
  color: var(--cisco-blue-dark);
}

[data-theme="light"] .btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: var(--border-default);
}

[data-theme="light"] .btn-ghost:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

[data-theme="light"] .btn-danger {
  background: var(--bg-surface);
  color: var(--status-error);
  border-color: var(--border-default);
}

[data-theme="light"] .btn-danger:hover {
  border-color: var(--status-error);
  background: rgba(199, 52, 40, 0.05);
}

/* ============ Tables ============ */
[data-theme="light"] .results-table {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
}

[data-theme="light"] .results-table thead {
  background: var(--bg-elevated);
}

[data-theme="light"] .results-table th {
  color: var(--text-tertiary);
  border-bottom: 1px solid var(--border-default);
}

[data-theme="light"] .results-table td {
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-subtle);
}

[data-theme="light"] .results-table tbody tr:hover {
  background: var(--bg-elevated);
}

[data-theme="light"] .results-table .row-error td {
  background: rgba(199, 52, 40, 0.05);
  color: var(--status-error);
}

/* ============ Code blocks (dark on light — developer convention) ============ */
[data-theme="light"] pre,
[data-theme="light"] .code-block {
  background: #0F1A2E;
  color: #E8EEF5;
  border: 1px solid #1E2A44;
  border-radius: var(--radius-sm);
}

[data-theme="light"] code {
  background: var(--bg-elevated);
  color: var(--cisco-blue-dark);
  border: 1px solid var(--border-subtle);
  padding: 1px 6px;
  border-radius: 2px;
}

[data-theme="light"] pre code,
[data-theme="light"] .code-block code {
  background: transparent;
  color: inherit;
  border: none;
  padding: 0;
}

/* ============ Reference blocks ============ */
[data-theme="light"] .reference-block {
  background: linear-gradient(180deg, var(--bg-elevated) 0%, var(--bg-surface) 100%);
  border: 1px solid var(--border-subtle);
  border-left: 3px solid var(--cisco-blue);
  box-shadow: var(--shadow-sm);
}

[data-theme="light"] .reference-block-text {
  color: var(--text-secondary);
}

[data-theme="light"] .reference-block-text code {
  background: var(--bg-surface);
  color: var(--cisco-blue-dark);
  border: 1px solid var(--border-subtle);
}

[data-theme="light"] .reference-link {
  background: var(--bg-surface);
  border-color: var(--border-default);
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
}

[data-theme="light"] .reference-link:hover {
  border-color: var(--cisco-blue);
  color: var(--cisco-blue-dark);
  background: var(--bg-hover);
  box-shadow: var(--shadow-md);
}

/* ============ References tab cards ============ */
[data-theme="light"] .ref-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
}

[data-theme="light"] .ref-card:hover {
  border-color: var(--border-default);
  box-shadow: 0 6px 20px rgba(15, 26, 46, 0.12), 0 2px 6px rgba(15, 26, 46, 0.06);
  transform: translateY(-2px);
}

[data-theme="light"] .ref-section-title {
  color: var(--cisco-blue-dark);
  border-bottom-color: var(--border-default);
}

[data-theme="light"] .ref-section-title::before {
  background: var(--cisco-blue);
}

[data-theme="light"] .ref-badge {
  background: var(--cisco-blue-glow);
  color: var(--cisco-blue-dark);
  border-color: rgba(14, 123, 176, 0.3);
}

[data-theme="light"] .ref-card-title {
  color: var(--text-primary);
}

[data-theme="light"] .ref-card-body {
  color: var(--text-secondary);
}

[data-theme="light"] .ref-card-body code {
  background: var(--bg-elevated);
  color: var(--cisco-blue-dark);
}

[data-theme="light"] .ref-card-footer {
  border-top-color: var(--border-subtle);
}

[data-theme="light"] .ref-card-link {
  color: var(--text-tertiary);
}

[data-theme="light"] .ref-card-link:hover {
  color: var(--cisco-blue-dark);
}

/* ============ Summary bars ============ */
[data-theme="light"] .summary-bar {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
}

/* ============ Mode toggle (Encode/Decode) ============ */
[data-theme="light"] .mode-toggle {
  background: var(--bg-elevated);
  border-color: var(--border-subtle);
  box-shadow: var(--shadow-sm);
}

[data-theme="light"] .mode-btn {
  color: var(--text-secondary);
}

[data-theme="light"] .mode-btn.active {
  background: var(--cisco-blue);
  color: white;
  box-shadow: 0 1px 2px rgba(14, 123, 176, 0.25);
}

[data-theme="light"] .mode-btn:hover:not(.active) {
  background: var(--bg-hover);
  color: var(--text-primary);
}

/* ============ Copy buttons ============ */
[data-theme="light"] .copy-btn {
  background: var(--bg-surface);
  border-color: var(--border-default);
  color: var(--text-tertiary);
}

[data-theme="light"] .copy-btn:hover {
  border-color: var(--cisco-blue);
  color: var(--cisco-blue-dark);
  background: var(--bg-hover);
}

[data-theme="light"] .copy-btn.copied {
  border-color: var(--status-success);
  color: var(--status-success);
  background: rgba(15, 138, 85, 0.06);
}

/* ============ Option 43 — Hex chips & TLV ============ */
[data-theme="light"] .hex-group {
  background: var(--bg-surface);
  box-shadow: 0 1px 2px rgba(15, 26, 46, 0.04);
}

[data-theme="light"] .hex-type {
  background: rgba(14, 123, 176, 0.10);
  color: var(--cisco-blue-dark);
  border-color: rgba(14, 123, 176, 0.4);
}

[data-theme="light"] .hex-length {
  background: rgba(199, 122, 15, 0.08);
  color: #A56710;
  border-color: rgba(199, 122, 15, 0.4);
}

[data-theme="light"] .hex-ip-1 {
  background: rgba(15, 138, 85, 0.08);
  color: #096B40;
  border-color: rgba(15, 138, 85, 0.4);
}

[data-theme="light"] .hex-ip-2 {
  background: rgba(124, 58, 173, 0.08);
  color: #5E2D8C;
  border-color: rgba(124, 58, 173, 0.4);
}

[data-theme="light"] .hex-ip-3 {
  background: rgba(199, 52, 40, 0.07);
  color: #A52A20;
  border-color: rgba(199, 52, 40, 0.35);
}

[data-theme="light"] .hex-ip-4 {
  background: rgba(184, 134, 11, 0.08);
  color: #8B6309;
  border-color: rgba(184, 134, 11, 0.4);
}

[data-theme="light"] .tlv-type {
  background: rgba(14, 123, 176, 0.10);
  color: var(--cisco-blue-dark);
  border-color: rgba(14, 123, 176, 0.4);
}

[data-theme="light"] .tlv-length {
  background: rgba(199, 122, 15, 0.08);
  color: #A56710;
  border-color: rgba(199, 122, 15, 0.4);
}

[data-theme="light"] .tlv-value {
  background: rgba(15, 138, 85, 0.07);
  color: #096B40;
  border-color: rgba(15, 138, 85, 0.35);
}

[data-theme="light"] .ip-breakdown-card {
  background: var(--bg-surface);
  border-color: var(--border-default);
  box-shadow: var(--shadow-sm);
}

[data-theme="light"] .ip-breakdown-1 { border-left-color: rgba(15, 138, 85, 0.7); }
[data-theme="light"] .ip-breakdown-2 { border-left-color: rgba(124, 58, 173, 0.7); }
[data-theme="light"] .ip-breakdown-3 { border-left-color: rgba(199, 52, 40, 0.65); }
[data-theme="light"] .ip-breakdown-4 { border-left-color: rgba(184, 134, 11, 0.7); }

[data-theme="light"] .octet-pair {
  background: var(--bg-elevated);
  border-color: var(--border-subtle);
}

[data-theme="light"] .octet-dec {
  color: var(--text-primary);
}

[data-theme="light"] .octet-hex {
  background: var(--cisco-blue-glow);
  color: var(--cisco-blue-dark);
}

[data-theme="light"] .ip-breakdown-result code {
  background: var(--bg-elevated);
  color: var(--text-mono);
  border-color: var(--border-default);
}

/* ============ FOM block ============ */
[data-theme="light"] .fom-block {
  background: var(--bg-elevated);
  border-color: var(--border-subtle);
  box-shadow: var(--shadow-sm);
}

[data-theme="light"] .fom-active-badge {
  background: linear-gradient(90deg, rgba(199, 122, 15, 0.10), rgba(199, 122, 15, 0.03));
  border: 1px solid rgba(199, 122, 15, 0.35);
  border-left: 3px solid var(--status-warning);
  color: var(--text-primary);
}

[data-theme="light"] .fom-icon {
  color: var(--status-warning);
}

[data-theme="light"] .fom-byte {
  color: var(--text-tertiary);
}

[data-theme="light"] .fom-hint {
  color: var(--text-tertiary);
}

/* ============ Misc components ============ */
[data-theme="light"] .cidr-pill {
  background: var(--cisco-blue-glow);
  color: var(--cisco-blue-dark);
  border: 1px solid rgba(14, 123, 176, 0.25);
}

[data-theme="light"] .error-message {
  background: rgba(199, 52, 40, 0.06);
  color: var(--status-error);
  border-left-color: var(--status-error);
}

[data-theme="light"] .success-banner {
  background: rgba(15, 138, 85, 0.06);
  border: 1px solid rgba(15, 138, 85, 0.25);
  color: var(--status-success);
}

[data-theme="light"] .warning-banner {
  background: rgba(199, 122, 15, 0.06);
  border-left-color: var(--status-warning);
}

[data-theme="light"] .legend-row {
  background: var(--bg-elevated);
  border-top-color: var(--border-subtle);
}

[data-theme="light"] .binary-bit.network {
  color: var(--cisco-blue-dark);
}

[data-theme="light"] .binary-bit.host {
  color: #A56710;
}

[data-theme="light"] .binary-dot {
  color: var(--text-tertiary);
}

/* ============ Topbar buttons ============ */
[data-theme="light"] .theme-btn,
[data-theme="light"] .help-btn {
  border-color: var(--border-default);
  color: var(--text-secondary);
  background: var(--bg-surface);
}

[data-theme="light"] .theme-btn:hover,
[data-theme="light"] .help-btn:hover {
  border-color: var(--cisco-blue);
  color: var(--cisco-blue-dark);
}

[data-theme="light"] .share-btn {
  background: var(--bg-surface);
  border-color: var(--border-default);
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
}

[data-theme="light"] .share-btn:hover {
  border-color: var(--cisco-blue);
  color: var(--cisco-blue-dark);
  background: var(--bg-hover);
}

/* ============ Shortcut palette ============ */
[data-theme="light"] .shortcut-overlay {
  background: rgba(15, 26, 46, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

[data-theme="light"] .shortcut-palette {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  box-shadow: 0 24px 60px rgba(15, 26, 46, 0.15), 0 8px 24px rgba(15, 26, 46, 0.08);
}

[data-theme="light"] .shortcut-search {
  background: var(--bg-input);
  color: var(--text-primary);
  border-bottom-color: var(--border-subtle);
}

[data-theme="light"] .shortcut-item {
  color: var(--text-secondary);
  border-bottom-color: var(--border-subtle);
}

[data-theme="light"] .shortcut-item:hover,
[data-theme="light"] .shortcut-item.active {
  background: var(--bg-hover);
  color: var(--cisco-blue-dark);
}

[data-theme="light"] .shortcut-help-title {
  color: var(--cisco-blue-dark);
}

[data-theme="light"] .shortcut-help-list kbd {
  background: var(--bg-elevated);
  color: var(--cisco-blue-dark);
  border-color: var(--border-default);
  box-shadow: 0 1px 0 var(--border-default);
}

[data-theme="light"] .shortcut-help-close {
  color: var(--text-tertiary);
  border-top-color: var(--border-subtle);
}

/* ============ Footer ============ */
[data-theme="light"] .footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  color: var(--text-tertiary);
}

/* ============ Scrollbar ============ */
[data-theme="light"] ::-webkit-scrollbar-track {
  background: var(--bg-base);
}

[data-theme="light"] ::-webkit-scrollbar-thumb {
  background: var(--border-strong);
}

[data-theme="light"] ::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

[data-theme="light"] ::selection {
  background: var(--cisco-blue);
  color: white;
}

/* VLSM rows on mobile */
@media (max-width: 640px) {
  [data-theme="light"] .vlsm-row {
    background: var(--bg-elevated);
  }
}

/* Theme transition smoothness */
body, .topbar, .sidebar, .card, .detail-section, .results-table,
.input, .textarea-input, .btn, .reference-block, .ref-card,
.summary-bar, .mode-toggle, pre, code, .footer,
.tab-button, .copy-btn, .hex-group, .ip-breakdown-card,
.fom-block, .reference-link, .ref-badge, .cidr-pill {
  transition: background-color 0.25s ease, border-color 0.25s ease,
              color 0.25s ease, box-shadow 0.25s ease;
}

/* ============================================================
   PRINT STYLES
   ============================================================ */

@media print {
  body { background: white; color: black; }
  body::before { display: none; }
  .topbar, .sidebar, .footer, .reference-block, .copy-btn,
  .help-btn, .share-btn, .theme-btn, .topbar-actions,
  .mode-toggle { display: none !important; }
  .app { grid-template-columns: 1fr; }
  .content { padding: 0; }
  .tab-panel { display: block !important; }
  .card, .detail-section { break-inside: avoid; border: 1px solid #ccc; }
  .results-table { page-break-inside: auto; }
  .results-table tr { page-break-inside: avoid; }
  pre { white-space: pre-wrap; word-break: break-all; }
}

/* ============================================================
   FOM (Fast Offline Migration)
   ============================================================ */

.fom-block {
  margin: 16px 0;
  padding: 14px 16px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
}

.fom-checkbox {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  cursor: pointer;
  user-select: none;
}

.fom-checkbox input[type="checkbox"] {
  margin-top: 2px;
  width: 16px;
  height: 16px;
  accent-color: var(--cisco-blue);
  cursor: pointer;
}

.fom-toggle-label strong {
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--text-primary);
  display: block;
  margin-bottom: 2px;
}

.fom-hint {
  display: block;
  font-size: 11px;
  color: var(--text-tertiary);
  font-family: var(--font-sans);
  line-height: 1.5;
}

.fom-mode-toggle {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-subtle);
  flex-wrap: wrap;
}

.fom-mode-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-tertiary);
  font-weight: 700;
}

.fom-radio {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
  user-select: none;
}

.fom-radio input[type="radio"] {
  width: 14px;
  height: 14px;
  accent-color: var(--cisco-blue);
  cursor: pointer;
}

.fom-radio input[type="radio"]:checked + span {
  color: var(--cisco-blue-light);
  font-weight: 600;
}

.fom-active-badge {
  margin-bottom: 16px;
  padding: 10px 14px;
  background: linear-gradient(90deg, rgba(243,156,18,0.12), rgba(243,156,18,0.04));
  border: 1px solid rgba(243,156,18,0.4);
  border-left: 3px solid var(--status-warning);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.fom-icon {
  font-size: 16px;
  color: var(--status-warning);
}

.fom-byte {
  margin-left: auto;
  color: var(--text-tertiary);
  font-size: 11px;
}

@media (max-width: 640px) {
  .fom-mode-toggle { gap: 10px; }
  .fom-radio { font-size: 11px; }
  .fom-active-badge { font-size: 11px; flex-wrap: wrap; }
  .fom-byte { margin-left: 0; width: 100%; }
}

/* ============================================================
   NUMBER BASE CONVERTER
   ============================================================ */

.numbase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}

.numbase-input {
  font-size: 16px !important;
  letter-spacing: 0.5px;
}

@media (max-width: 640px) {
  .numbase-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   FOOTER LINKS
   ============================================================ */

.footer-brand {
  letter-spacing: 1px;
}

.footer-links {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-tertiary);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: all 0.18s ease;
}

.footer-link:hover {
  color: var(--cisco-blue-light);
  background: var(--bg-hover);
}

.footer-link:hover .footer-icon {
  transform: translateY(-1px);
  color: var(--cisco-blue-light);
}

.footer-icon {
  flex-shrink: 0;
  color: var(--text-tertiary);
  transition: transform 0.18s ease, color 0.18s ease;
}

.footer-divider {
  color: var(--border-strong);
  font-size: 10px;
  user-select: none;
}

/* Light theme adjustments */
[data-theme="light"] .footer-link {
  color: var(--text-secondary);
}

[data-theme="light"] .footer-link:hover {
  color: var(--cisco-blue-dark);
  background: var(--bg-hover);
}

[data-theme="light"] .footer-link:hover .footer-icon {
  color: var(--cisco-blue-dark);
}

[data-theme="light"] .footer-icon {
  color: var(--text-tertiary);
}

[data-theme="light"] .footer-divider {
  color: var(--border-default);
}

/* Mobile — daha kompakt ama linkler okunaklı */
@media (max-width: 640px) {
  .footer {
    flex-direction: column;
    gap: 8px;
    text-align: center;
    padding: 12px 14px;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
  }

  .footer-link {
    font-size: 9px;
    padding: 3px 6px;
  }
}

@media (max-width: 380px) {
  .footer-link span {
    font-size: 9px;
  }

  .footer-link span.long-text {
    display: none;
  }
}