/* Lingyue's Homepage — Editorial Luxury Design System */

/* Fonts: Outfit (body) + Space Grotesk (display/mono) */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');

/* ═══════════════════════════════════════════════
   DESIGN TOKENS — Dark Editorial
   ═══════════════════════════════════════════════ */
:root, [data-theme="dark"] {
  --bg-void: #050505;
  --bg-primary: #08080c;
  --bg-secondary: #0e0d14;
  --bg-elevated: #12111a;

  --card-bg: rgba(10,10,14,0.85);
  --card-bg-hover: rgba(16,15,22,0.92);
  --card-border: rgba(255,255,255,0.06);
  --card-border-hover: rgba(255,255,255,0.12);
  --card-border-inner: rgba(255,255,255,0.03);
  --card-glow: rgba(196,145,122,0.04);

  --shell-bg: rgba(255,255,255,0.03);
  --shell-border: rgba(255,255,255,0.05);

  --sidebar-bg: rgba(8,8,12,0.92);
  --sidebar-width: 240px;
  --sidebar-collapsed: 72px;

  --text-primary: #eeeaf4;
  --text-secondary: #9f98b0;
  --text-muted: #5e5873;

  --input-bg: rgba(255,255,255,0.05);
  --input-border: rgba(255,255,255,0.08);

  --accent: #c4917a;
  --accent-rgb: 196, 145, 122;
  --accent-dim: rgba(196, 145, 122, 0.08);
  --accent-glow: rgba(196, 145, 122, 0.15);

  --danger: #e06060;
  --success: #7ab896;
  --warning: #d4a76a;

  --orb-1: rgba(120, 80, 160, 0.06);
  --orb-2: rgba(196, 145, 122, 0.05);
  --orb-3: rgba(80, 120, 140, 0.04);

  --radius: 20px;
  --radius-sm: 12px;
  --radius-xs: 8px;
  --radius-pill: 9999px;

  --blur: 40px;
  --saturate: 1.6;

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.32, 0.72, 0, 1);
  --ease-magnetic: cubic-bezier(0.25, 0.46, 0.45, 0.94);

  --shadow-hue: 20;
}

/* ═══════════════════════════════════════════════
   DESIGN TOKENS — Light
   ═══════════════════════════════════════════════ */
[data-theme="light"] {
  --bg-void: #f8f6f2;
  --bg-primary: #f5f3ef;
  --bg-secondary: #eae7e2;
  --bg-elevated: #ffffff;

  --card-bg: rgba(255,255,255,0.72);
  --card-bg-hover: rgba(255,255,255,0.88);
  --card-border: rgba(0,0,0,0.06);
  --card-border-hover: rgba(0,0,0,0.1);
  --card-border-inner: rgba(255,255,255,0.6);
  --card-glow: rgba(166,117,96,0.04);

  --shell-bg: rgba(0,0,0,0.02);
  --shell-border: rgba(0,0,0,0.05);

  --sidebar-bg: rgba(255,255,255,0.92);

  --text-primary: #1a1815;
  --text-secondary: #4a4540;
  --text-muted: #8a8580;

  --input-bg: rgba(0,0,0,0.03);
  --input-border: rgba(0,0,0,0.08);

  --accent: #a67560;
  --accent-rgb: 166, 117, 96;
  --accent-dim: rgba(166, 117, 96, 0.06);
  --accent-glow: rgba(166, 117, 96, 0.1);

  --danger: #c04848;
  --success: #5a9876;
  --warning: #b08840;

  --orb-1: rgba(166, 117, 96, 0.04);
  --orb-2: rgba(120, 100, 80, 0.03);
  --orb-3: rgba(80, 100, 120, 0.03);

  --shadow-hue: 30;
}

/* ═══════════════════════════════════════════════
   RESET & BASE
   ═══════════════════════════════════════════════ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html {
  scroll-behavior: smooth;
  background: var(--bg-void);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
body {
  min-height: 100dvh;
  font-family: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-primary);
  background: transparent;
  overflow-x: hidden;
  transition: color 0.4s var(--ease-spring);
  line-height: 1.6;
}

/* ═══════════════════════════════════════════════
   MESH GRADIENT BACKGROUND
   ═══════════════════════════════════════════════ */
.bg-container {
  position: fixed;
  inset: 0;
  z-index: -2;
  overflow: hidden;
}
.bg-container img,
.bg-container .bg-slide {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 0.8s var(--ease-spring);
  position: absolute;
  top: 0; left: 0;
}
.bg-container img.active,
.bg-container .bg-slide.active,
.bg-container img[style*="opacity: 1"] {
  opacity: 1;
}

.bg-overlay {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 60% at 20% 10%, var(--orb-1), transparent 50%),
    radial-gradient(ellipse 60% 50% at 80% 80%, var(--orb-2), transparent 50%),
    radial-gradient(ellipse 40% 40% at 50% 50%, var(--orb-3), transparent 40%),
    linear-gradient(180deg, rgba(5,5,5,0.02) 0%, rgba(5,5,5,0.06) 100%);
  transition: background 0.6s var(--ease-spring);
}

/* Film grain — fixed, pointer-events-none, z-index 50 */
.bg-overlay::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 50;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.7' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.025'/%3E%3C/svg%3E");
  opacity: 0.025;
  pointer-events: none;
  mix-blend-mode: overlay;
}
[data-theme="light"] .bg-overlay {
  background:
    radial-gradient(ellipse 80% 60% at 20% 10%, var(--orb-1), transparent 50%),
    radial-gradient(ellipse 60% 50% at 80% 80%, var(--orb-2), transparent 50%),
    linear-gradient(180deg, rgba(255,255,255,0.08) 0%, rgba(255,255,255,0.2) 100%);
}

/* ═══════════════════════════════════════════════
   FLUID ISLAND NAV — Floating Glass Pill
   ═══════════════════════════════════════════════ */
.sidebar {
  position: fixed;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 56px;
  height: auto;
  max-height: calc(100dvh - 32px);
  background: var(--sidebar-bg);
  backdrop-filter: blur(var(--blur)) saturate(var(--saturate));
  -webkit-backdrop-filter: blur(var(--blur)) saturate(var(--saturate));
  border: 1px solid var(--card-border);
  border-radius: 28px;
  z-index: 100;
  display: flex;
  flex-direction: column;
  padding: 12px 0;
  transition: width 0.5s var(--ease-spring), box-shadow 0.5s var(--ease-spring);
  overflow: hidden;
  box-shadow: 0 8px 32px -8px hsla(var(--shadow-hue), 20%, 4%, 0.2);
}
.sidebar:hover {
  width: 200px;
  box-shadow: 0 12px 48px -12px hsla(var(--shadow-hue), 20%, 4%, 0.3);
}

.sidebar-header {
  padding: 0 14px 12px;
  border-bottom: 1px solid var(--card-border);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
  overflow: hidden;
}
.sidebar-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}
.sidebar-name {
  font-family: 'Space Grotesk', monospace;
  font-size: 13px;
  font-weight: 600;
  opacity: 0;
  transition: opacity 0.3s 0.15s var(--ease-spring);
  letter-spacing: -0.01em;
}
.sidebar:hover .sidebar-name { opacity: 1; }

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 0 6px;
  scrollbar-width: none;
}
.sidebar-nav::-webkit-scrollbar { display: none; }

/* Tree nav */
.nav-group { margin-bottom: 1px; }
.nav-children {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.4s var(--ease-spring);
  padding-left: 14px;
}
.nav-group.expanded .nav-children { max-height: 200px; }
.nav-group.expanded .nav-arrow { transform: rotate(180deg); }
.nav-arrow {
  width: 12px; height: 12px;
  margin-left: auto;
  transition: transform 0.4s var(--ease-spring), opacity 0.3s;
  opacity: 0;
}
.sidebar:hover .nav-arrow { opacity: 1; }

.nav-child {
  padding: 6px 10px !important;
  font-size: 11px !important;
  gap: 6px !important;
}
.nav-child::before {
  content: '';
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--card-border);
  flex-shrink: 0;
  transition: background 0.3s, box-shadow 0.3s;
}
.nav-child:hover::before,
.nav-child.active::before {
  background: var(--accent);
  box-shadow: 0 0 6px rgba(var(--accent-rgb), 0.5);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 10px;
  font-size: 12px;
  font-weight: 400;
  transition: all 0.35s var(--ease-spring);
  margin-bottom: 1px;
  white-space: nowrap;
  overflow: hidden;
  cursor: pointer;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}
.nav-item:hover,
.nav-item.active {
  background: var(--accent-dim);
  color: var(--accent);
  transform: translateX(2px);
}
.nav-item:active {
  transform: scale(0.97) translateX(2px);
}
.nav-item:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.nav-item svg {
  width: 16px; height: 16px;
  flex-shrink: 0;
  stroke-width: 1.5;
}
.nav-item .nav-label {
  opacity: 0;
  transition: opacity 0.3s 0.15s;
}
.sidebar:hover .nav-item .nav-label { opacity: 1; }

.sidebar-footer {
  padding: 8px 6px 0;
  border-top: 1px solid var(--card-border);
  margin-top: 8px;
}

/* ═══════════════════════════════════════════════
   HAMBURGER MORPH — Fluid X Transform
   ═══════════════════════════════════════════════ */
.mobile-toggle {
  display: none;
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 300;
  width: 44px;
  height: 44px;
  background: var(--card-bg);
  backdrop-filter: blur(var(--blur)) saturate(var(--saturate));
  -webkit-backdrop-filter: blur(var(--blur)) saturate(var(--saturate));
  border: 1px solid var(--card-border);
  border-radius: 50%;
  color: var(--text-primary);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition: all 0.4s var(--ease-spring);
  overflow: hidden;
}
.mobile-toggle:hover {
  background: var(--card-bg-hover);
  transform: scale(1.06);
}

/* Hamburger lines container */
.hamburger {
  width: 18px;
  height: 14px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.hamburger span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: all 0.4s var(--ease-spring);
  transform-origin: center;
}

/* Morph to X when open */
.mobile-toggle.open .hamburger span:nth-child(1) {
  transform: translateY(6.25px) rotate(45deg);
}
.mobile-toggle.open .hamburger span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.mobile-toggle.open .hamburger span:nth-child(3) {
  transform: translateY(-6.25px) rotate(-45deg);
}

/* ═══════════════════════════════════════════════
   FULL-SCREEN MENU OVERLAY — Staggered Reveal
   ═══════════════════════════════════════════════ */
.menu-overlay {
  position: fixed;
  inset: 0;
  z-index: 250;
  background: rgba(5,5,5,0.78);
  backdrop-filter: blur(28px) saturate(1.2);
  -webkit-backdrop-filter: blur(28px) saturate(1.2);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s var(--ease-spring), visibility 0.5s;
}
.menu-overlay.active {
  opacity: 1;
  visibility: visible;
}

.menu-overlay .menu-link {
  font-family: 'Space Grotesk', monospace;
  font-size: 28px;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  transition: all 0.35s var(--ease-spring);
  transform: translateY(24px);
  opacity: 0;
  letter-spacing: -0.02em;
}
.menu-overlay.active .menu-link {
  transform: translateY(0);
  opacity: 1;
}
.menu-overlay .menu-link:hover {
  color: var(--accent);
  background: var(--accent-dim);
}

/* Stagger delays for menu links */
.menu-overlay .menu-link:nth-child(1) { transition-delay: 0.05s; }
.menu-overlay .menu-link:nth-child(2) { transition-delay: 0.1s; }
.menu-overlay .menu-link:nth-child(3) { transition-delay: 0.15s; }
.menu-overlay .menu-link:nth-child(4) { transition-delay: 0.2s; }
.menu-overlay .menu-link:nth-child(5) { transition-delay: 0.25s; }
.menu-overlay .menu-link:nth-child(6) { transition-delay: 0.3s; }

/* ═══════════════════════════════════════════════
   MAIN CONTENT — Editorial Rhythm
   ═══════════════════════════════════════════════ */
.main-content {
  margin-left: 80px;
  padding: 48px 56px;
  position: relative;
  z-index: 1;
  transition: margin-left 0.5s var(--ease-spring);
}
.page {
  max-width: 900px;
  margin: 0 auto;
}

/* ═══════════════════════════════════════════════
   DOUBLE-BEZEL GLASS CARD SYSTEM
   backdrop-filter ONLY on fixed/sticky elements
   ═══════════════════════════════════════════════ */

/* Outer Shell — the aluminum tray */
.bezel {
  background: var(--shell-bg);
  border: 1px solid var(--shell-border);
  border-radius: calc(var(--radius) + 6px);
  padding: 6px;
  transition: all 0.5s var(--ease-spring);
}
.bezel:hover {
  background: rgba(255,255,255,0.04);
}
[data-theme="light"] .bezel:hover {
  background: rgba(0,0,0,0.03);
}

/* Inner Core — NO backdrop-filter on scrolling content */
.glass {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  transition: all 0.5s var(--ease-spring);
  box-shadow:
    0 4px 24px -4px hsla(var(--shadow-hue), 20%, 4%, 0.1),
    0 1px 3px -1px hsla(var(--shadow-hue), 15%, 4%, 0.06),
    inset 0 1px 0 var(--card-border-inner);
  position: relative;
  overflow: hidden;
}

/* Inner highlight — edge refraction */
.glass::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid transparent;
  background: linear-gradient(
    145deg,
    rgba(255,255,255,0.07) 0%,
    transparent 40%,
    transparent 60%,
    rgba(255,255,255,0.02) 100%
  ) border-box;
  mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  mask-composite: exclude;
  -webkit-mask-composite: xor;
  pointer-events: none;
  z-index: 1;
}

/* Spotlight border — cursor tracking */
.glass::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  opacity: 0;
  transition: opacity 0.5s var(--ease-spring);
  background: radial-gradient(
    400px circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
    rgba(var(--accent-rgb), 0.05),
    transparent 50%
  );
  pointer-events: none;
  z-index: 1;
}
.glass:hover::after { opacity: 1; }

.glass:hover {
  background: var(--card-bg-hover);
  border-color: var(--card-border-hover);
  box-shadow:
    0 16px 40px -8px hsla(var(--shadow-hue), 20%, 4%, 0.14),
    0 4px 12px -4px hsla(var(--shadow-hue), 15%, 4%, 0.08),
    inset 0 1px 0 rgba(255,255,255,0.06);
  transform: translateY(-2px);
}

/* ═══════════════════════════════════════════════
   EYEBROW TAGS — Microscopic pills
   ═══════════════════════════════════════════════ */
.section-label {
  font-family: 'Space Grotesk', monospace;
  font-size: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  margin-bottom: 16px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  background: var(--accent-dim);
  border: 1px solid rgba(var(--accent-rgb), 0.1);
  border-radius: var(--radius-pill);
}
.section-label::before {
  content: '';
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 6px rgba(var(--accent-rgb), 0.5);
}

/* ═══════════════════════════════════════════════
   ISLAND BUTTONS — Button-in-Button Architecture
   ═══════════════════════════════════════════════ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.4s var(--ease-spring);
  font-family: inherit;
  box-shadow:
    0 2px 8px -2px rgba(var(--accent-rgb), 0.4),
    inset 0 1px 0 rgba(255,255,255,0.15);
  position: relative;
  overflow: hidden;
}
.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(180deg, rgba(255,255,255,0.12) 0%, transparent 50%);
  pointer-events: none;
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow:
    0 8px 20px -4px rgba(var(--accent-rgb), 0.45),
    inset 0 1px 0 rgba(255,255,255,0.2);
}
.btn:active {
  transform: scale(0.98) translateY(0);
  box-shadow:
    0 1px 4px -1px rgba(var(--accent-rgb), 0.3),
    inset 0 1px 0 rgba(255,255,255,0.1);
}
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* Trailing icon — nested circle */
.btn .btn-icon-trail {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.4s var(--ease-spring);
  flex-shrink: 0;
}
.btn .btn-icon-trail svg {
  width: 12px; height: 12px;
}
.btn:hover .btn-icon-trail {
  transform: translate(2px, -1px) scale(1.08);
}

.btn-danger {
  background: var(--danger);
  box-shadow: 0 2px 8px -2px rgba(224,96,96,0.4), inset 0 1px 0 rgba(255,255,255,0.15);
}
.btn-success {
  background: var(--success);
  box-shadow: 0 2px 8px -2px rgba(122,184,150,0.4), inset 0 1px 0 rgba(255,255,255,0.15);
}
.btn-outline {
  background: transparent;
  border: 1px solid var(--card-border);
  color: var(--text-secondary);
  box-shadow: none;
}
.btn-outline::before { display: none; }
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
  transform: translateY(-1px);
}
.btn-group {
  display: flex;
  gap: 10px;
  margin-top: 20px;
  flex-wrap: wrap;
}

/* ═══════════════════════════════════════════════
   FORMS
   ═══════════════════════════════════════════════ */
.form-group { margin-bottom: 16px; }
.form-group label {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
input[type="text"],
input[type="password"],
input[type="email"],
input[type="date"],
input[type="datetime-local"],
input[type="file"],
textarea,
select {
  width: 100%;
  padding: 12px 16px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 13px;
  font-family: inherit;
  transition: all 0.35s var(--ease-spring);
}
input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: rgba(var(--accent-rgb), 0.4);
  background: var(--accent-dim);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.08);
}
textarea {
  min-height: 100px;
  resize: vertical;
  line-height: 1.7;
}
select { cursor: pointer; }
select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

/* ═══════════════════════════════════════════════
   BACK LINK
   ═══════════════════════════════════════════════ */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13px;
  margin-bottom: 24px;
  transition: all 0.35s var(--ease-spring);
  padding: 6px 0;
}
.back-link:hover {
  color: var(--accent);
  transform: translateX(-2px);
}
.back-link svg {
  width: 14px; height: 14px;
  stroke-width: 1.5;
}

/* ═══════════════════════════════════════════════
   TOAST — Spring bounce
   ═══════════════════════════════════════════════ */
.toast {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 14px 24px;
  background: rgba(var(--accent-rgb), 0.94);
  color: #fff;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 500;
  opacity: 0;
  transform: translateY(-16px) scale(0.96);
  transition: all 0.5s var(--ease-spring);
  z-index: 1000;
  backdrop-filter: blur(16px);
  box-shadow: 0 8px 24px -4px rgba(var(--accent-rgb), 0.3);
}
.toast.show {
  opacity: 1;
  transform: translateY(0) scale(1);
}
.toast.error {
  background: rgba(224, 96, 96, 0.94);
  box-shadow: 0 8px 24px -4px rgba(224,96,96,0.3);
}
.toast.success {
  background: rgba(122, 184, 150, 0.94);
  box-shadow: 0 8px 24px -4px rgba(122,184,150,0.3);
}

/* ═══════════════════════════════════════════════
   THEME TOGGLE
   ═══════════════════════════════════════════════ */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 200;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all 0.4s var(--ease-spring);
}
.theme-toggle:hover {
  background: var(--card-bg-hover);
  transform: translateY(-1px);
  border-color: var(--card-border-hover);
}
.theme-toggle svg {
  width: 15px; height: 15px;
  color: var(--text-secondary);
  stroke-width: 1.5;
}
.theme-toggle-label {
  font-size: 11px;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ═══════════════════════════════════════════════
   SCROLL REVEAL SYSTEM — Blur Interpolation
   ═══════════════════════════════════════════════ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 0.9s var(--ease-out-expo),
    transform 0.9s var(--ease-out-expo);
  will-change: transform, opacity;
}
.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}
.reveal-blur {
  opacity: 0;
  transform: translateY(24px);
  filter: blur(10px);
  transition:
    opacity 0.9s var(--ease-out-expo),
    transform 0.9s var(--ease-out-expo),
    filter 0.9s var(--ease-out-expo);
  will-change: transform, opacity, filter;
}
.reveal-blur.revealed {
  opacity: 1;
  transform: translateY(0);
  filter: blur(0);
}

/* Stagger delays */
.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }
.reveal-delay-4 { transition-delay: 0.32s; }
.reveal-delay-5 { transition-delay: 0.4s; }

/* ═══════════════════════════════════════════════
   HIDDEN UTILITY
   ═══════════════════════════════════════════════ */
.hidden { display: none !important; }

/* ═══════════════════════════════════════════════
   RESPONSIVE — Tablet (768px)
   ═══════════════════════════════════════════════ */
@media (max-width: 768px) {
  .mobile-toggle { display: flex; }
  .sidebar {
    display: none;
  }
  .main-content {
    margin-left: 0;
    padding: 80px 24px 40px;
  }
  .theme-toggle {
    top: 16px;
    right: 72px;
    padding: 6px 10px;
  }
  .theme-toggle svg { width: 14px; height: 14px; }
  .glass {
    border-radius: 16px;
  }
  .bezel {
    padding: 4px;
    border-radius: 20px;
  }
  .page { padding: 0; }
}

/* ═══════════════════════════════════════════════
   RESPONSIVE — Mobile (480px)
   ═══════════════════════════════════════════════ */
@media (max-width: 480px) {
  .main-content {
    padding: 72px 16px 32px;
  }
  .glass {
    border-radius: 14px;
  }
  .bezel {
    padding: 3px;
    border-radius: 17px;
  }
  .theme-toggle {
    top: 14px;
    right: 64px;
    padding: 5px 8px;
    border-radius: 16px;
  }
  .mobile-toggle {
    top: 14px;
    left: 14px;
    width: 40px;
    height: 40px;
  }
  .toast {
    top: 14px;
    right: 14px;
    left: 14px;
    font-size: 12px;
    padding: 12px 18px;
    border-radius: 12px;
  }
  .btn {
    padding: 10px 18px;
    font-size: 12px;
  }
  input[type="text"],
  input[type="password"],
  input[type="email"],
  input[type="date"],
  input[type="datetime-local"],
  input[type="file"],
  textarea,
  select {
    padding: 10px 14px;
    font-size: 13px;
  }
  .section-label {
    font-size: 9px;
    padding: 4px 12px;
    margin-bottom: 12px;
  }
  .back-link {
    font-size: 12px;
    margin-bottom: 20px;
  }
  .back-link svg { width: 12px; height: 12px; }
  .menu-overlay .menu-link {
    font-size: 22px;
    padding: 10px 18px;
  }
}

/* ═══════════════════════════════════════════════
   SCROLLBAR — Minimal
   ═══════════════════════════════════════════════ */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.08);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255,255,255,0.15);
}
[data-theme="light"] ::-webkit-scrollbar-thumb {
  background: rgba(0,0,0,0.08);
}
[data-theme="light"] ::-webkit-scrollbar-thumb:hover {
  background: rgba(0,0,0,0.15);
}

/* ═══════════════════════════════════════════════
   SKELETON LOADING
   ═══════════════════════════════════════════════ */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--input-bg) 25%,
    rgba(var(--accent-rgb), 0.04) 50%,
    var(--input-bg) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.8s var(--ease-magnetic) infinite;
}
@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ═══════════════════════════════════════════════
   BACK TO TOP
   ═══════════════════════════════════════════════ */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.45s var(--ease-spring);
  z-index: 10;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--card-bg-hover);
  transform: translateY(-3px);
  border-color: var(--card-border-hover);
}
.back-to-top svg {
  width: 16px; height: 16px;
  stroke-width: 1.5;
}

/* ═══════════════════════════════════════════════
   SKIP LINK — Accessibility
   ═══════════════════════════════════════════════ */
.skip-link {
  position: absolute;
  top: -48px;
  left: 0;
  background: var(--accent);
  color: #fff;
  padding: 10px 16px;
  text-decoration: none;
  z-index: 10000;
  transition: top 0.3s var(--ease-spring);
  font-size: 13px;
  font-weight: 500;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus {
  top: 0;
}

/* ═══════════════════════════════════════════════
   DETERMINATE PROGRESS RING — Page Loading
   ═══════════════════════════════════════════════ */
.progress-ring-overlay {
  position: fixed;
  inset: 0;
  z-index: 9998;
  background: var(--bg-void);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 20px;
  transition: opacity 0.5s var(--ease-spring), visibility 0.5s;
}
.progress-ring-overlay.fade-out {
  opacity: 0;
  visibility: hidden;
}

.progress-ring-container {
  position: relative;
  width: 80px;
  height: 80px;
}

.progress-ring-svg {
  width: 80px;
  height: 80px;
  transform: rotate(-90deg);
}

.progress-ring-track {
  fill: none;
  stroke: var(--card-border);
  stroke-width: 3;
}

.progress-ring-bar {
  fill: none;
  stroke: var(--accent);
  stroke-width: 3;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.3s var(--ease-spring);
  filter: drop-shadow(0 0 6px rgba(var(--accent-rgb), 0.4));
}

.progress-ring-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Space Grotesk', monospace;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.progress-ring-label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-weight: 400;
}

/* ═══════════════════════════════════════════════
   404 PAGE
   ═══════════════════════════════════════════════ */
.page-404 {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: calc(100dvh - 160px);
  text-align: center;
  padding: 40px 24px;
}
.page-404-img {
  max-width: 320px;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  margin-bottom: 28px;
  opacity: 0;
  transform: scale(0.95) translateY(12px);
  animation: page404-in 0.7s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
.page-404-title {
  font-family: 'Space Grotesk', monospace;
  font-size: 48px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.04em;
  margin-bottom: 8px;
  opacity: 0;
  animation: page404-in 0.6s cubic-bezier(0.16, 1, 0.3, 1) 0.1s forwards;
}
.page-404-desc {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 28px;
  opacity: 0;
  animation: page404-in 0.6s cubic-bezier(0.16, 1, 0.3, 1) 0.2s forwards;
}
.page-404 .btn {
  opacity: 0;
  animation: page404-in 0.6s cubic-bezier(0.16, 1, 0.3, 1) 0.3s forwards;
}

@keyframes page404-in {
  0% { opacity: 0; transform: scale(0.95) translateY(12px); }
  100% { opacity: 1; transform: scale(1) translateY(0); }
}