/* ============================================
   GL.iNet Modem Guide
   Frost white · Glassmorphism 2.0 · SF Pro
   Fonts: https://github.com/bradleyhodges/SFWindows/tree/main/SF%20Pro
   ============================================ */

/* ---------- SF Pro — SFWindows: https://github.com/bradleyhodges/SFWindows/tree/main/SF%20Pro ---------- */
@font-face {
  font-family: "SF Pro Display";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: local("SF Pro Display"), local("SFProDisplay-Regular"),
       url("../fonts/SF-Pro-Display-Regular.otf") format("opentype"),
       url("https://raw.githubusercontent.com/bradleyhodges/SFWindows/main/SF%20Pro/SF-Pro-Display-Regular.otf") format("opentype");
}
@font-face {
  font-family: "SF Pro Display";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: local("SF Pro Display Medium"), local("SFProDisplay-Medium"),
       url("../fonts/SF-Pro-Display-Medium.otf") format("opentype"),
       url("https://raw.githubusercontent.com/bradleyhodges/SFWindows/main/SF%20Pro/SF-Pro-Display-Medium.otf") format("opentype");
}
@font-face {
  font-family: "SF Pro Display";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: local("SF Pro Display Semibold"), local("SFProDisplay-Semibold"),
       url("../fonts/SF-Pro-Display-Semibold.otf") format("opentype"),
       url("https://raw.githubusercontent.com/bradleyhodges/SFWindows/main/SF%20Pro/SF-Pro-Display-Semibold.otf") format("opentype");
}
@font-face {
  font-family: "SF Pro Display";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: local("SF Pro Display Bold"), local("SFProDisplay-Bold"),
       url("../fonts/SF-Pro-Display-Bold.otf") format("opentype"),
       url("https://raw.githubusercontent.com/bradleyhodges/SFWindows/main/SF%20Pro/SF-Pro-Display-Bold.otf") format("opentype");
}
@font-face {
  font-family: "SF Pro Text";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: local("SF Pro Text"), local("SFProText-Regular"),
       url("../fonts/SF-Pro-Text-Regular.otf") format("opentype"),
       url("https://raw.githubusercontent.com/bradleyhodges/SFWindows/main/SF%20Pro/SF-Pro-Text-Regular.otf") format("opentype");
}
@font-face {
  font-family: "SF Pro Text";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: local("SF Pro Text Medium"), local("SFProText-Medium"),
       url("../fonts/SF-Pro-Text-Medium.otf") format("opentype"),
       url("https://raw.githubusercontent.com/bradleyhodges/SFWindows/main/SF%20Pro/SF-Pro-Text-Medium.otf") format("opentype");
}
@font-face {
  font-family: "SF Pro Text";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: local("SF Pro Text Semibold"), local("SFProText-Semibold"),
       url("../fonts/SF-Pro-Text-Semibold.otf") format("opentype"),
       url("https://raw.githubusercontent.com/bradleyhodges/SFWindows/main/SF%20Pro/SF-Pro-Text-Semibold.otf") format("opentype");
}

:root {
  /* Frost white glass — more translucent, stronger blur */
  --glass-bg: rgba(255, 255, 255, 0.4);
  --glass-bg-strong: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(255, 255, 255, 0.65);
  --glass-border-strong: rgba(255, 255, 255, 0.85);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.06), 0 0 0 1px rgba(255, 255, 255, 0.5) inset;
  --glass-shadow-lift: 0 20px 50px rgba(0, 0, 0, 0.08), 0 0 0 1px rgba(255, 255, 255, 0.7) inset;
  --blur: 24px;
  --blur-strong: 32px;

  --bg-base: #e8ecf1;
  --text-primary: #1a1d21;
  --text-secondary: #4b5563;
  --text-muted: #6b7280;

  --accent: #0ea5e9;
  --accent-dim: #0284c7;
  --success: #059669;
  --warning: #d97706;
  --danger: #dc2626;
  --security-bg: rgba(5, 150, 105, 0.08);
  --speed-bg: rgba(217, 119, 6, 0.08);
  --gradient-bubblegum: linear-gradient(135deg, #ff9ebb 0%, #ffb6c1 30%, #ffd1dc 55%, #ffb6c1 80%, #ff69b4 100%);

  /* SF Pro from SFWindows */
  --font-display: "SF Pro Display", -apple-system, system-ui, sans-serif;
  --font-sans: "SF Pro Text", -apple-system, system-ui, sans-serif;
  --font-mono: "SF Pro Text", ui-monospace, "SF Mono", monospace;

  --sidebar-width: 200px;
  --header-height: 56px;
  --radius: 16px;
  --radius-organic: 20px 18px 22px 16px;
  --radius-organic-b: 18px 22px 16px 20px;
  --ease: cubic-bezier(0.33, 1, 0.68, 1);
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --duration-fast: 180ms;
  --duration-normal: 320ms;
  --duration-slow: 520ms;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; }
html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  background:
    radial-gradient(ellipse 120% 80% at 70% -20%, rgba(255, 255, 255, 0.9) 0%, transparent 50%),
    radial-gradient(ellipse 80% 60% at -10% 50%, rgba(248, 250, 252, 0.95) 0%, transparent 45%),
    radial-gradient(ellipse 100% 100% at 90% 90%, rgba(241, 245, 249, 0.8) 0%, transparent 50%),
    var(--bg-base);
}

/* ========== Abstract glassy background graphics ========== */
.bg-graphics {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

.bg-blob {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(ellipse 70% 70% at 30% 30%, rgba(255, 220, 235, 0.5), rgba(255, 182, 193, 0.35));
  backdrop-filter: blur(40px);
  -webkit-backdrop-filter: blur(40px);
  box-shadow:
    0 0 80px rgba(255, 182, 193, 0.25),
    inset -15px -15px 35px rgba(255, 255, 255, 0.15),
    inset 20px 20px 40px rgba(255, 192, 203, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.35);
  animation: blob-drift 18s ease-in-out infinite;
  will-change: transform;
}
.bg-blob-1 { width: 320px; height: 320px; top: -80px; right: -60px; animation-delay: 0s; animation-duration: 20s; }
.bg-blob-2 { width: 280px; height: 280px; bottom: 10%; left: -100px; animation-delay: -4s; animation-duration: 22s; }
.bg-blob-3 { width: 200px; height: 200px; top: 40%; right: 15%; animation-delay: -8s; animation-duration: 19s; }
.bg-blob-4 { width: 160px; height: 160px; top: 70%; left: 30%; animation-delay: -2s; animation-duration: 21s; }
.bg-blob-5 { width: 240px; height: 240px; bottom: -60px; right: 20%; animation-delay: -6s; animation-duration: 23s; }

.bg-orb {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(ellipse 65% 65% at 28% 28%, rgba(255, 240, 245, 0.7), rgba(255, 182, 193, 0.4));
  border: 1px solid rgba(255, 255, 255, 0.5);
  box-shadow:
    0 0 30px rgba(255, 182, 193, 0.3),
    inset -8px -8px 20px rgba(255, 255, 255, 0.25),
    inset 10px 10px 25px rgba(255, 192, 203, 0.15);
  animation: orb-drift 14s ease-in-out infinite;
  will-change: transform;
}
.bg-orb-1 { width: 60px; height: 60px; top: 20%; left: 10%; animation-delay: 0s; animation-duration: 15s; }
.bg-orb-2 { width: 40px; height: 40px; top: 60%; right: 25%; animation-delay: -5s; animation-duration: 16s; }
.bg-orb-3 { width: 50px; height: 50px; bottom: 25%; left: 60%; animation-delay: -3s; animation-duration: 17s; }

.bg-mesh {
  position: absolute;
  width: 120%;
  height: 120%;
  top: -10%;
  left: -10%;
  opacity: 0.5;
  animation: mesh-drift 25s linear infinite;
  will-change: transform;
}
.mesh-path {
  fill: none;
  stroke: url(#mesh-grad);
  stroke-width: 0.5;
  stroke-linecap: round;
  stroke-dasharray: 8 12;
  opacity: 0.6;
  animation: mesh-draw 15s ease-in-out infinite;
}
.mesh-path-2 { animation-delay: -5s; }
.mesh-path-3 { animation-delay: -10s; }
.mesh-dot {
  fill: rgba(255, 255, 255, 0.3);
  animation: dot-twinkle 4s ease-in-out infinite;
}
.mesh-dot:nth-child(5) { animation-delay: -1s; }
.mesh-dot:nth-child(6) { animation-delay: -2s; }
.mesh-dot:nth-child(7) { animation-delay: -3s; }
.mesh-dot:nth-child(8) { animation-delay: -0.5s; }

@keyframes blob-drift {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(40px, -35px) scale(1.02); }
  50% { transform: translate(-30px, 45px) scale(0.98); }
  75% { transform: translate(35px, 25px) scale(1.01); }
}
@keyframes orb-drift {
  0%, 100% { transform: translate(0, 0); }
  20% { transform: translate(25px, -20px); }
  40% { transform: translate(-15px, 30px); }
  60% { transform: translate(30px, 15px); }
  80% { transform: translate(-20px, -25px); }
}
@keyframes mesh-drift {
  0% { transform: translate(0, 0); }
  50% { transform: translate(-8%, -5%); }
  100% { transform: translate(0, 0); }
}
@keyframes mesh-draw {
  0%, 100% { stroke-dashoffset: 0; opacity: 0.4; }
  50% { opacity: 0.8; stroke-dashoffset: 30; }
}
@keyframes dot-twinkle {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.8; }
}

@media (prefers-reduced-motion: reduce) {
  .bg-blob, .bg-orb, .bg-mesh, .mesh-path, .mesh-dot { animation: none; }
  .nav-list a:hover .nav-emoji,
  .nav-list a.active .nav-emoji { animation: none; }
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  font-weight: 600;
  z-index: 100;
  transition: top var(--duration-fast) var(--ease);
}
.skip-link:focus {
  top: 1rem;
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ========== Black glass — Header ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  isolation: isolate;
  padding: 0.5rem 1.75rem;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--blur)) saturate(1.2);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(1.2);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
}
.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.lang-wrap {
  position: relative;
  margin-left: auto;
}
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  background: rgba(0, 0, 0, 0.06);
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease), border-color var(--duration-fast) var(--ease);
}
.lang-toggle:hover {
  background: rgba(0, 0, 0, 0.1);
  border-color: rgba(0, 0, 0, 0.15);
}
.lang-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.lang-toggle-icon {
  width: 1.1rem;
  height: 1.1rem;
  flex-shrink: 0;
  stroke: var(--text-primary);
}
.lang-dropdown {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  min-width: 220px;
  padding: 0.75rem;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  z-index: 100;
}
.lang-dropdown[hidden] {
  display: none;
}
.lang-dropdown:not([hidden]) {
  display: block;
}
.lang-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.35rem;
}
.lang-option {
  padding: 0.5rem 0.6rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid transparent;
  border-radius: 6px;
  color: rgba(255, 255, 255, 0.9);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  text-align: center;
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease), border-color var(--duration-fast) var(--ease), color var(--duration-fast) var(--ease);
}
.lang-option:hover {
  background: rgba(255, 255, 255, 0.12);
}
.lang-option[aria-selected="true"],
.lang-option.selected {
  background: rgba(14, 165, 233, 0.35);
  border-color: rgba(14, 165, 233, 0.5);
  color: #fff;
}
@media (max-width: 500px) {
  .lang-toggle-text { display: none; }
  .lang-grid { grid-template-columns: repeat(2, 1fr); }
}
.menu-toggle {
  display: none;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  padding: 0;
  border: none;
  background: rgba(0, 0, 0, 0.06);
  border-radius: 8px;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  transition: background var(--duration-fast) var(--ease);
}
.menu-toggle:hover { background: rgba(0, 0, 0, 0.1); }
.menu-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.menu-toggle[aria-expanded="true"] .menu-toggle-bar:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] .menu-toggle-bar:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] .menu-toggle-bar:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }
.menu-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: transform var(--duration-normal) var(--ease), opacity var(--duration-fast);
}
.site-title {
  margin: 0;
  flex: 1;
  min-width: 0;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  background: var(--gradient-bubblegum);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.site-title .site-tagline {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-secondary);
  background: none;
  background-clip: unset;
  -webkit-background-clip: unset;
  margin-left: 0.25rem;
}
.site-title .site-tagline::before {
  content: "·";
  margin-right: 0.5rem;
  opacity: 0.7;
}

/* ========== Layout — Organic, anti-grid ========== */
.layout {
  position: relative;
  z-index: 1;
  display: flex;
  flex: 1;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
  padding: 0 1.5rem 2rem;
  gap: 2.5rem;
}

/* ========== Frost glass — Sidebar ========== */
.sidebar {
  position: sticky;
  top: calc(var(--header-height) + 1rem);
  align-self: start;
  width: var(--sidebar-width);
  flex-shrink: 0;
  max-height: calc(100vh - var(--header-height) - 2rem);
  overflow-y: auto;
  overflow-x: hidden;
  padding: 1.25rem 0;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-organic);
  box-shadow: var(--glass-shadow);
  -webkit-overflow-scrolling: touch;
}
.sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: rgba(0, 0, 0, 0.15); border-radius: 3px; }
.sidebar::-webkit-scrollbar-thumb:hover { background: rgba(0, 0, 0, 0.25); }
.nav-label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin: 0 0 0.75rem 0;
  padding: 0 0.85rem;
}
.nav-list {
  list-style: none;
  margin: 0;
  padding: 0.25rem 0;
}
.nav-list li { margin: 0; }
.nav-list a {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.85rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--duration-fast) var(--ease), background var(--duration-fast) var(--ease);
}
.nav-emoji {
  font-size: 1rem;
  line-height: 1;
  display: inline-block;
  transition: transform var(--duration-normal) var(--ease);
  background: var(--gradient-bubblegum);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.nav-list a:hover .nav-emoji {
  animation: emoji-bounce 0.5s var(--ease);
}
.nav-list a.active .nav-emoji {
  filter: drop-shadow(0 0 6px rgba(255, 105, 180, 0.5));
  animation: emoji-glow 2s ease-in-out infinite;
}
.nav-made-by .nav-emoji {
  background: var(--gradient-bubblegum);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.nav-made-by:hover { color: var(--accent); }
@keyframes emoji-bounce {
  0%, 100% { transform: scale(1); }
  40% { transform: scale(1.25); }
  70% { transform: scale(0.95); }
}
@keyframes emoji-glow {
  0%, 100% { filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.06)); opacity: 1; }
  50% { filter: drop-shadow(0 0 8px rgba(14, 165, 233, 0.3)); opacity: 0.95; }
}
.nav-list a::after {
  content: "";
  position: absolute;
  left: 0.85rem;
  bottom: 0.35rem;
  width: 0;
  height: 1.5px;
  background: var(--accent);
  border-radius: 2px;
  transition: width var(--duration-normal) var(--ease-out);
}
.nav-list a:hover {
  color: var(--text-primary);
  background: rgba(0, 0, 0, 0.04);
}
.nav-list a:hover::after { width: calc(100% - 1.7rem); }
.nav-list a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.nav-list a.active {
  color: var(--accent);
  background: rgba(14, 165, 233, 0.08);
}
.nav-list a.active::after { width: calc(100% - 1.7rem); }

/* ========== Main content ========== */
.main-content {
  flex: 1;
  min-width: 0;
  padding: 1rem 0 3rem;
}

/* ========== Motion narrative ========== */
@keyframes reveal {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========== Frost glass — Section cards (more glass) ========== */
.section-card {
  position: relative;
  margin-bottom: 2rem;
  padding: 1.75rem 2rem;
  max-width: 680px;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  transition:
    border-color var(--duration-normal) var(--ease),
    box-shadow var(--duration-normal) var(--ease),
    transform var(--duration-normal) var(--ease);
  opacity: 0;
  transform: translateY(24px);
}
.section-card.revealed {
  animation: reveal var(--duration-slow) var(--ease-out) forwards;
}
.section-card:nth-child(odd) { margin-left: 0; border-radius: var(--radius-organic); }
.section-card:nth-child(even) { margin-left: 4%; border-radius: var(--radius-organic-b); }
.section-card:hover {
  border-color: var(--glass-border-strong);
  box-shadow: var(--glass-shadow-lift);
  transform: translateY(-3px);
}
.section-card[id],
.section-card:target {
  scroll-margin-top: calc(var(--header-height) + 1rem);
}
.section-card.revealed:nth-child(1) { animation-delay: 0ms; }
.section-card.revealed:nth-child(2) { animation-delay: 60ms; }
.section-card.revealed:nth-child(3) { animation-delay: 120ms; }
.section-card.revealed:nth-child(4) { animation-delay: 80ms; }
.section-card.revealed:nth-child(5) { animation-delay: 140ms; }
.section-card.revealed:nth-child(6) { animation-delay: 100ms; }
.section-card.revealed:nth-child(7) { animation-delay: 160ms; }
.section-card.revealed:nth-child(8) { animation-delay: 120ms; }
.section-card.revealed:nth-child(9) { animation-delay: 180ms; }
.section-card.revealed:nth-child(10) { animation-delay: 140ms; }
.section-card.revealed:nth-child(11) { animation-delay: 200ms; }

/* Archival index — SF Pro Display headings */
.section-card h2 {
  margin: 0 0 0.6rem 0;
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  flex-wrap: wrap;
  background: var(--gradient-bubblegum);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.section-card h2 .section-num,
.section-card h2 .menu-icon {
  background: none;
  background-clip: unset;
  -webkit-background-clip: unset;
  color: var(--text-muted);
}
.section-card h2 .menu-icon { opacity: 0.9; }
.section-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}
.section-card h3 {
  margin: 1.5rem 0 0.5rem 0;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 600;
  background: var(--gradient-bubblegum);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.section-card h3:first-of-type { margin-top: 1.25rem; }
.section-card h4 {
  margin: 1.25rem 0 0.4rem 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
}
.menu-icon { font-size: 1.15rem; opacity: 0.88; }

.section-card p {
  margin: 0 0 0.75rem 0;
  color: var(--text-secondary);
}
.section-card p:last-child { margin-bottom: 0; }

.setting-list {
  margin: 0 0 0.75rem 0;
  padding-left: 1.2rem;
  color: var(--text-secondary);
}
.setting-list li { margin-bottom: 0.4rem; }

.settings-dl {
  margin: 0 0 1.25rem 0;
  color: var(--text-secondary);
}
.settings-dl dt {
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 0.85rem;
  font-size: 0.92rem;
}
.settings-dl dt:first-child { margin-top: 0; }
.settings-dl dd { margin: 0.2rem 0 0 0; }

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  padding: 0.18em 0.45em;
  background: rgba(255, 255, 255, 0.6);
  border-radius: 6px;
  color: var(--accent-dim);
  border: 1px solid rgba(255, 255, 255, 0.8);
  transition: background var(--duration-fast), border-color var(--duration-fast);
}
code:hover {
  background: rgba(255, 255, 255, 0.75);
  border-color: rgba(255, 255, 255, 0.9);
}

/* ========== Frost glass — Callouts ========== */
.callout {
  margin: 1.25rem 0 0 0;
  padding: 1rem 1.25rem;
  background: var(--glass-bg-strong);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  border-left: 4px solid;
  font-size: 0.9rem;
  color: var(--text-primary);
  box-shadow: var(--glass-shadow);
  transition: transform var(--duration-fast) var(--ease), box-shadow var(--duration-fast) var(--ease);
}
.callout:hover {
  transform: translateX(4px);
  box-shadow: var(--glass-shadow-lift);
}
.callout-security {
  border-left-color: #ff69b4;
}
.callout-speed-vs-security {
  border-left-color: #ff69b4;
}

/* Intro */
.intro {
  background: rgba(255, 255, 255, 0.5);
  border-color: rgba(255, 255, 255, 0.9);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.05), 0 0 0 1px rgba(255, 255, 255, 0.8) inset;
}

/* ========== Frost glass — Footer ========== */
.site-footer {
  margin-top: auto;
  padding: 1.5rem 1.75rem;
  background: rgba(0, 0, 0, 0.32);
  backdrop-filter: blur(24px) saturate(1.2);
  -webkit-backdrop-filter: blur(24px) saturate(1.2);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.2), inset 0 -1px 0 rgba(255, 255, 255, 0.06);
}
.footer-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.footer-credit {
  margin: 0;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.85);
}
.footer-github {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: rgba(255, 255, 255, 0.95);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
  transition:
    color var(--duration-fast) var(--ease),
    background var(--duration-fast) var(--ease),
    border-color var(--duration-fast) var(--ease),
    transform var(--duration-fast) var(--ease),
    box-shadow var(--duration-fast) var(--ease);
}
.footer-github:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}
.footer-github:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.github-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform var(--duration-fast) var(--ease);
}
.footer-github:hover .github-icon { transform: scale(1.08); }

/* ========== Responsive — hamburger + overlay menu ========== */
.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 90;
  background: rgba(0, 0, 0, 0.4);
  opacity: 0;
  transition: opacity 0.25s var(--ease);
  pointer-events: none;
}
body.menu-open .sidebar-backdrop {
  display: block;
  opacity: 1;
  pointer-events: auto;
}

@media (max-width: 900px) {
  body.menu-open { overflow: hidden; }
  .menu-toggle { display: flex; }
  .layout { flex-direction: column; padding: 0 1rem 1.5rem; gap: 1.25rem; }
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 95;
    width: min(280px, 85vw);
    max-width: 280px;
    max-height: none;
    margin: 0;
    padding: 3rem 0 1.5rem;
    transform: translateX(-100%);
    transition: transform 0.3s var(--ease);
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.15);
  }
  body.menu-open .sidebar {
    transform: translateX(0);
  }
  .nav-list {
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 0 0.5rem;
  }
  .nav-list a {
    padding: 0.65rem 0.75rem;
    min-height: 44px;
    align-items: center;
  }
  .nav-list a::after { display: none; }
  .section-card:nth-child(even) { margin-left: 0; }
  .section-card { max-width: none; padding: 1.35rem 1.25rem; margin-bottom: 1.5rem; }
  .main-content { padding: 0.5rem 0 2rem; }
}

@media (max-width: 768px) {
  body { font-size: 0.9375rem; }
  .site-header { padding: 0.5rem 1rem; }
  .site-title { font-size: 1.1rem; }
  .site-title .site-tagline { font-size: 0.75rem; margin-left: 0.2rem; }
  .section-card h2 { font-size: 1.15rem; }
  .section-card h3 { font-size: 1rem; }
  .section-card { padding: 1.2rem 1rem; }
  .callout { padding: 0.85rem 1rem; font-size: 0.875rem; }
  .footer-github { padding: 0.5rem 0.85rem; font-size: 0.85rem; }
}

@media (max-width: 500px) {
  .layout { padding: 0 0.75rem 1rem; }
  .site-header { padding: 0.4rem 0.75rem; }
  .site-title { font-size: 1rem; flex-wrap: wrap; gap: 0.25rem; }
  .site-title .site-tagline { font-size: 0.7rem; margin-left: 0; display: block; width: 100%; }
  .site-title .site-tagline::before { content: none; }
  .sidebar { padding: 0.75rem; }
  .nav-label { font-size: 0.65rem; padding: 0 0.5rem; }
  .nav-list a { font-size: 0.8rem; padding: 0.5rem 0.6rem; }
  .nav-emoji { font-size: 0.9rem; }
  .section-card { padding: 1rem 0.85rem; margin-bottom: 1.25rem; }
  .section-card h2 { font-size: 1.05rem; }
  .section-card h3 { font-size: 0.95rem; }
  .section-num { font-size: 0.7rem; }
  .settings-dl dt, .settings-dl dd { font-size: 0.875rem; }
  code { font-size: 0.8em; padding: 0.15em 0.35em; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 0.75rem; padding: 1rem; }
  .footer-credit { font-size: 0.8rem; }
  .footer-github { font-size: 0.8rem; }
}

@media (max-width: 380px) {
  .site-title .site-tagline { font-size: 0.65rem; }
}