/* Modern Web Guidance: apply color-scheme on :root with light-dark() and prefers-color-scheme fallbacks */
:root {
  color-scheme: light dark;

  --bg-light: #f6f8fa;
  --bg-dark: #0b0f17;
  --surface-light: #ffffff;
  --surface-dark: #131b2e;
  --surface-alt-light: #eef2f7;
  --surface-alt-dark: #1a243b;
  --border-light: #d8dee9;
  --border-dark: #283552;
  --text-light: #0f172a;
  --text-dark: #e2e8f0;
  --muted-light: #475569;
  --muted-dark: #94a3b8;
  --brand-light: #0284c7;
  --brand-dark: #38bdf8;
  --accent-v6-light: #7c3aed;
  --accent-v6-dark: #a78bfa;
  --success-light: #15803d;
  --success-dark: #4ade80;
  --warn-light: #b45309;
  --warn-dark: #fbbf24;
  --danger-light: #b91c1c;
  --danger-dark: #f87171;

  /* Default (Light) fallback */
  --bg: var(--bg-light);
  --surface: var(--surface-light);
  --surface-alt: var(--surface-alt-light);
  --border: var(--border-light);
  --text: var(--text-light);
  --muted: var(--muted-light);
  --brand: var(--brand-light);
  --accent-v6: var(--accent-v6-light);
  --success: var(--success-light);
  --warn: var(--warn-light);
  --danger: var(--danger-light);

  /* Fallback for browsers without light-dark() */
  @media (prefers-color-scheme: dark) {
    --bg: var(--bg-dark);
    --surface: var(--surface-dark);
    --surface-alt: var(--surface-alt-dark);
    --border: var(--border-dark);
    --text: var(--text-dark);
    --muted: var(--muted-dark);
    --brand: var(--brand-dark);
    --accent-v6: var(--accent-v6-dark);
    --success: var(--success-dark);
    --warn: var(--warn-dark);
    --danger: var(--danger-dark);
  }

  /* Modern light-dark() color tokens */
  @supports (color: light-dark(white, black)) {
    --bg: light-dark(var(--bg-light), var(--bg-dark));
    --surface: light-dark(var(--surface-light), var(--surface-dark));
    --surface-alt: light-dark(var(--surface-alt-light), var(--surface-alt-dark));
    --border: light-dark(var(--border-light), var(--border-dark));
    --text: light-dark(var(--text-light), var(--text-dark));
    --muted: light-dark(var(--muted-light), var(--muted-dark));
    --brand: light-dark(var(--brand-light), var(--brand-dark));
    --accent-v6: light-dark(var(--accent-v6-light), var(--accent-v6-dark));
    --success: light-dark(var(--success-light), var(--success-dark));
    --warn: light-dark(var(--warn-light), var(--warn-dark));
    --danger: light-dark(var(--danger-light), var(--danger-dark));
  }

  accent-color: var(--brand);
  scrollbar-width: thin;
  scrollbar-color: var(--border) var(--bg);
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: var(--bg-dark);
  --surface: var(--surface-dark);
  --surface-alt: var(--surface-alt-dark);
  --border: var(--border-dark);
  --text: var(--text-dark);
  --muted: var(--muted-dark);
  --brand: var(--brand-dark);
  --accent-v6: var(--accent-v6-dark);
  --success: var(--success-dark);
  --warn: var(--warn-dark);
  --danger: var(--danger-dark);
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: var(--bg-light);
  --surface: var(--surface-light);
  --surface-alt: var(--surface-alt-light);
  --border: var(--border-light);
  --text: var(--text-light);
  --muted: var(--muted-light);
  --brand: var(--brand-light);
  --accent-v6: var(--accent-v6-light);
  --success: var(--success-light);
  --warn: var(--warn-light);
  --danger: var(--danger-light);
}

@supports not (scrollbar-color: auto) {
  ::-webkit-scrollbar {
    width: 10px;
    height: 10px;
  }
  ::-webkit-scrollbar-thumb {
    background: var(--border);
  }
  ::-webkit-scrollbar-track {
    background: var(--bg);
  }
}

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

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.55;
  min-height: 100vh;
}

a {
  color: var(--brand);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem 1.5rem 3rem;
}

/* Navbar */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding-bottom: 1rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--text);
}

.brand-badge {
  background: var(--brand);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.15rem 0.45rem;
  border-radius: 5px;
  font-weight: 700;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

/* Buttons & Inputs */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.85rem;
  border-radius: 7px;
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.15s, transform 0.1s;
}

.btn:hover {
  border-color: var(--brand);
}

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

.btn-primary {
  background: var(--brand);
  color: #ffffff;
  border-color: transparent;
}

.btn-primary:hover {
  opacity: 0.92;
}

.btn-pro {
  background: linear-gradient(135deg, #7c3aed, #0284c7);
  color: #ffffff;
  border: none;
}

.btn-sm {
  padding: 0.25rem 0.55rem;
  font-size: 0.76rem;
}

.input, .select {
  padding: 0.5rem 0.75rem;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: var(--surface-alt);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.88rem;
}

.input:focus, .select:focus {
  outline: 2px solid var(--brand);
  outline-offset: 1px;
}

/* Hero IP Box (ipconfig.io style) */
.hero-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.hero-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
}

.ip-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.ip-display {
  font-family: var(--font-mono);
  font-size: clamp(1.45rem, 3.6vw, 2.5rem);
  font-weight: 800;
  color: var(--brand);
  word-break: break-all;
  margin: 0.35rem 0 0.6rem;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  align-items: center;
  font-size: 0.85rem;
  color: var(--muted);
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 700;
  font-family: var(--font-mono);
  background: var(--surface-alt);
  border: 1px solid var(--border);
  color: var(--text);
}

.pill-v6 {
  border-color: var(--accent-v6);
  color: var(--accent-v6);
}

.pill-ok {
  border-color: var(--success);
  color: var(--success);
}

.pill-warn {
  border-color: var(--warn);
  color: var(--warn);
}

.sim-bar {
  margin-top: 1.1rem;
  padding-top: 0.9rem;
  border-top: 1px dashed var(--border);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--muted);
}

/* Grid Layout */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--border);
}

.card-title {
  font-size: 1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Info Table (ipconfig.io key-value table) */
.kv-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.kv-table tr {
  border-bottom: 1px solid var(--border);
}

.kv-table tr:last-child {
  border-bottom: none;
}

.kv-table th {
  text-align: left;
  padding: 0.55rem 0.5rem 0.55rem 0;
  color: var(--muted);
  font-weight: 600;
  width: 36%;
  vertical-align: top;
}

.kv-table td {
  padding: 0.55rem 0;
  font-family: var(--font-mono);
  word-break: break-all;
}

/* IPv6 Visual Anatomy Breakdown */
.v6-anatomy {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  padding: 0.85rem;
  background: var(--surface-alt);
  border-radius: 8px;
  border: 1px solid var(--border);
  margin-bottom: 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

.hextet-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.35rem 0.55rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface);
}

.hextet-box.isp {
  border-color: #0284c7;
  color: var(--brand);
}

.hextet-box.subnet {
  border-color: #d97706;
  color: var(--warn);
}

.hextet-box.iid {
  border-color: #7c3aed;
  color: var(--accent-v6);
}

.hextet-tag {
  font-size: 0.63rem;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 0.15rem;
}

/* Alert boxes */
.alert {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.84rem;
  margin-top: 0.75rem;
  border: 1px solid var(--border);
  background: var(--surface-alt);
}

.alert-warn {
  border-color: var(--warn);
  color: var(--warn);
}

.alert-ok {
  border-color: var(--success);
  color: var(--success);
}

/* Map container */
#map {
  width: 100%;
  height: 250px;
  border-radius: 8px;
  border: 1px solid var(--border);
  margin-top: 0.75rem;
  z-index: 1;
}

/* Code / CLI snippets */
.code-block {
  background: #0d1117;
  color: #e6edf3;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 0.85rem 1rem;
  border-radius: 8px;
  overflow-x: auto;
  border: 1px solid #30363d;
  margin-bottom: 0.65rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.code-cmd {
  white-space: pre;
}

/* Pro / Locked overlay box */
.pro-lock-banner {
  background: var(--surface-alt);
  border: 1px dashed var(--accent-v6);
  border-radius: 10px;
  padding: 1.1rem;
  margin-bottom: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.tool-form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.85rem;
}

.tool-output {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  max-height: 280px;
  overflow-y: auto;
  white-space: pre-wrap;
}

/* Native Dialog (Modern Web Guidance light-dismiss) */
dialog {
  margin: auto;
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  max-width: 460px;
  width: calc(100% - 2rem);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.35);
}

dialog::backdrop {
  background-color: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(3px);
}

.dialog-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.form-stack {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer {
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--muted);
}