/* ============================================================
   DESIGN SYSTEM — 戚俊皓 | Personal Website v3
   Light blue + white · Clean financial · Airy & professional
   ============================================================ */

/* ----- Color Tokens ----- */
:root {
  /* Base */
  --bg: #ffffff;
  --bg-soft: #f5f8fc;
  --surface: #ffffff;
  --surface-hover: #f0f4fa;
  --glass: rgba(255,255,255,0.75);
  --glass-border: rgba(26,75,140,0.08);

  /* Text */
  --text: #1a2332;
  --text-secondary: #5a6a7e;
  --text-muted: #8a9baa;

  /* Accent - Deep Blue */
  --accent: #1A4B8C;
  --accent-light: #3A7BC8;
  --accent-dark: #0f3460;
  --accent-glow: rgba(26,75,140,0.08);
  --accent-subtle: rgba(26,75,140,0.04);
  --accent-border: rgba(26,75,140,0.12);

  /* Gold highlight */
  --gold: #D4A843;
  --gold-light: #E8C86A;
  --gold-glow: rgba(212,168,67,0.08);
  --gold-border: rgba(212,168,67,0.15);

  /* Module colors */
  --c-music: #3B82F6;
  --c-travel: #10B981;
  --c-sports: #8B5CF6;
  --c-photo: #F59E0B;
  --c-resume: #1A4B8C;
  --c-about: #1A4B8C;

  /* UI */
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --shadow-sm: 0 1px 3px rgba(26,75,140,0.04), 0 1px 2px rgba(26,75,140,0.06);
  --shadow: 0 4px 12px rgba(26,75,140,0.06), 0 2px 4px rgba(26,75,140,0.04);
  --shadow-lg: 0 12px 40px rgba(26,75,140,0.08), 0 4px 12px rgba(26,75,140,0.04);
  --shadow-xl: 0 24px 60px rgba(26,75,140,0.1);

  /* Radius */
  --radius-sm: 8px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  /* Typography */
  --font-sans: 'Instrument Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Instrument Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
  --font-cn: 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;

  --ease: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --transition: 0.35s var(--ease-smooth);
}

/* ----- Dark Mode ----- */
[data-theme="dark"] {
  --bg: #080d1a;
  --bg-soft: #0f172a;
  --surface: #131c31;
  --surface-hover: #1a2640;
  --glass: rgba(19,28,49,0.82);
  --glass-border: rgba(96,165,250,0.12);

  --text: #e8edf5;
  --text-secondary: #94a3b8;
  --text-muted: #5a6b8a;

  --border: #1e2d48;
  --border-light: #18243a;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow: 0 4px 12px rgba(0,0,0,0.5);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.6);
  --shadow-xl: 0 24px 60px rgba(0,0,0,0.7);

  --accent: #5b9cf5;
  --accent-light: #7db8ff;
  --accent-dark: #3a7bd5;
  --accent-glow: rgba(91,156,245,0.12);
  --accent-subtle: rgba(91,156,245,0.06);
  --accent-border: rgba(91,156,245,0.15);

  --gold: #E8C86A;
  --gold-light: #F0D88A;
  --gold-glow: rgba(232,200,106,0.1);
  --gold-border: rgba(232,200,106,0.15);
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Smooth theme transition on all color/shadow/border properties */
html.theme-transitioning *,
html.theme-transitioning *::before,
html.theme-transitioning *::after {
  transition: background 0.35s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease !important;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-cn);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

::selection { background: var(--accent); color: white; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }

/* ============================================================
   UTILITY
   ============================================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}
@media (max-width: 640px) {
  .container { padding: 0 1.25rem; }
}

/* ============================================================
   PARTICLES CANVAS
   ============================================================ */
#particles-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(20px) saturate(1.1);
  -webkit-backdrop-filter: blur(20px) saturate(1.1);
  border-bottom: 1px solid rgba(226,232,240,0.5);
  transition: box-shadow var(--transition);
}

[data-theme="dark"] .navbar {
  background: rgba(8,13,26,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom-color: rgba(30,45,72,0.6);
}

.navbar.scrolled {
  box-shadow: 0 1px 8px rgba(26,75,140,0.06);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  transition: opacity var(--transition);
}
.nav-logo:hover { opacity: 0.7; }
.nav-logo .dot { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.nav-links a {
  padding: 0.4rem 0.875rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  background: var(--accent-subtle);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.theme-toggle {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: all var(--transition);
}
.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-subtle);
}

.nav-toggle {
  display: none;
  width: 38px;
  height: 38px;
  background: none;
  border: none;
  cursor: pointer;
  position: relative;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  transition: all 0.3s ease;
}
.nav-toggle span:nth-child(1) { top: 12px; }
.nav-toggle span:nth-child(2) { top: 18px; }
.nav-toggle span:nth-child(3) { top: 24px; }
.nav-toggle.active span:nth-child(1) { top: 18px; transform: translateX(-50%) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { top: 18px; transform: translateX(-50%) rotate(-45deg); }

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    padding: 0.75rem 1rem 1.25rem;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--border);
    gap: 0.125rem;
  }
  [data-theme="dark"] .nav-links {
    background: rgba(15,23,42,0.98);
  }
  .nav-links { display: none; }
  .nav-gooey { display: none; }
  .nav-links a { padding: 0.625rem 0.875rem; width: 100%; }
  .nav-toggle { display: block; }
}

/* Mobile fallback: show nav-links when toggled */
@media (max-width: 768px) {
  .nav-links.active { display: flex; }
}

/* ============================================================
   GOOEY NAV (navbar integration)
   ============================================================ */
.nav-gooey {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
}

.gooey-nav-container {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
}

.gooey-nav-container nav {
  display: flex;
  position: relative;
  transform: translate3d(0, 0, 0.01px);
}

.gooey-nav-container nav ul {
  display: flex;
  gap: 0.25rem;
  list-style: none;
  padding: 0 0.5em;
  margin: 0;
  position: relative;
  z-index: 3;
  color: var(--text);
  text-shadow: none;
}

.gooey-nav-container nav ul li {
  border-radius: 100vw;
  position: relative;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
}

.gooey-nav-container nav ul li a {
  display: inline-block;
  padding: 0.4rem 0.875rem;
  text-decoration: none;
  color: inherit;
  border-radius: 100vw;
  transition: background 0.25s ease;
}

.gooey-nav-container nav ul li a:hover {
  background: var(--accent-subtle);
}

.gooey-nav-container nav ul li.active a {
  color: var(--accent);
  background: var(--accent-subtle);
}

.gooey-nav-container .effect {
  position: absolute;
  left: 0;
  top: 0;
  width: 0;
  height: 0;
  opacity: 0;
  pointer-events: none;
  z-index: 1;
}

/* Particle styles */
.particle,
.point {
  display: block;
  opacity: 0;
  width: 20px;
  height: 20px;
  border-radius: 100%;
  transform-origin: center;
}

.particle {
  --time: 5s;
  position: absolute;
  top: calc(50% - 8px);
  left: calc(50% - 8px);
  animation: particle calc(var(--time)) ease 1 -350ms;
}

.point {
  background: var(--color, var(--accent));
  opacity: 1;
  animation: point calc(var(--time)) ease 1 -350ms;
}

@keyframes particle {
  0% {
    transform: rotate(0deg) translate(calc(var(--start-x)), calc(var(--start-y)));
    opacity: 1;
    animation-timing-function: cubic-bezier(0.55, 0, 1, 0.45);
  }
  70% {
    transform: rotate(calc(var(--rotate) * 0.5)) translate(calc(var(--end-x) * 1.2), calc(var(--end-y) * 1.2));
    opacity: 1;
    animation-timing-function: ease;
  }
  85% {
    transform: rotate(calc(var(--rotate) * 0.66)) translate(calc(var(--end-x)), calc(var(--end-y)));
    opacity: 1;
  }
  100% {
    transform: rotate(calc(var(--rotate) * 1.2)) translate(calc(var(--end-x) * 0.5), calc(var(--end-y) * 0.5));
    opacity: 1;
  }
}

@keyframes point {
  0% {
    transform: scale(0);
    opacity: 0;
    animation-timing-function: cubic-bezier(0.55, 0, 1, 0.45);
  }
  25% {
    transform: scale(calc(var(--scale) * 0.25));
  }
  38% { opacity: 1; }
  65% {
    transform: scale(var(--scale));
    opacity: 1;
    animation-timing-function: ease;
  }
  85% {
    transform: scale(var(--scale));
    opacity: 1;
  }
  100% {
    transform: scale(0);
    opacity: 0;
  }
}

/* ============================================================
   LANGUAGE TOGGLE
   ============================================================ */
.lang-toggle {
  display: flex;
  align-items: center;
  height: 30px;
  background: var(--accent-subtle);
  border-radius: 20px;
  padding: 2px;
  gap: 0;
  position: relative;
}

.lang-item {
  padding: 3px 10px;
  font-size: 0.72rem;
  font-weight: 600;
  border-radius: 16px;
  font-family: var(--font-body, var(--font-cn));
  cursor: pointer;
  color: var(--text-secondary);
  white-space: nowrap;
  position: relative;
  z-index: 1;
  user-select: none;
}

.lang-item.active {
  background: var(--accent);
  color: #fff;
}

.lang-item:hover:not(.active) {
  color: var(--accent);
}

@media (max-width: 768px) {
  .lang-toggle {
    height: 28px;
  }
  .lang-item {
    padding: 2px 6px;
    font-size: 0.68rem;
  }
}

/* ============================================================
   PAGE HEADER (sub-pages)
   ============================================================ */
.page-header {
  padding: 10rem 2rem 4rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}
.page-header .page-icon {
  font-size: 2.5rem;
  margin-bottom: 1.25rem;
  display: block;
}
.page-header h1 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
  line-height: 1.2;
  color: var(--accent);
}
.page-header .page-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto;
}
.page-header .page-tag {
  display: inline-block;
  padding: 0.3rem 0.875rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  font-family: var(--font-mono);
  margin-bottom: 1rem;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-subtle);
  border: 1px solid var(--accent-border);
}

/* ============================================================
   SECTIONS
   ============================================================ */
.section {
  padding: 5rem 2rem;
  position: relative;
  z-index: 2;
}
.section-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.section-header {
  margin-bottom: 3rem;
}
.section-header h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}
.section-header .section-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  max-width: 520px;
}
.section-header.centered { text-align: center; }
.section-header.centered .section-desc { margin: 0 auto; }

/* ============================================================
   CARDS
   ============================================================ */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: all var(--transition);
}
.card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-border);
}

/* ============================================================
   GRID
   ============================================================ */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}
@media (max-width: 768px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

/* ============================================================
   TAGS
   ============================================================ */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.75rem;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--accent-subtle);
  color: var(--accent);
  border: 1px solid var(--accent-border);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--font-cn);
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: all var(--transition);
}
.btn-primary {
  background: var(--accent);
  color: white;
  box-shadow: 0 2px 8px rgba(26,75,140,0.25);
}
.btn-primary:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(26,75,140,0.35);
}
.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-subtle);
  transform: translateY(-2px);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  border-top: 1px solid var(--border);
  padding: 3rem 2rem;
  text-align: center;
  background: var(--bg-soft);
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.footer-logo {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}
.footer-logo .dot { color: var(--accent); }
.footer-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}
.footer-links a {
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--accent); }

/* ============================================================
   BACK TO TOP
   ============================================================ */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 999;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--transition);
  backdrop-filter: blur(12px);
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-subtle);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  .about-hero {
    min-height: 35vh;
    padding: 5rem 1.25rem 2rem;
  }
  .menu-section {
    height: 65vh;
  }
  .hide-desktop { display: none; }
}

@media (max-width: 480px) {
  .section { padding: 3rem 1.25rem; }
  .page-header { padding: 8rem 1.25rem 3rem; }
}

/* ============================================================
   HERO TEXT (left side of homepage)
   ============================================================ */
.hero-text {
  position: absolute;
  left: 10%;
  top: 28%;
  z-index: 3;
  pointer-events: none;
  max-width: 520px;
}

.hero-greeting {
  font-family: var(--font-display);
  font-size: clamp(4rem, 7vw, 6rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.1;
  color: var(--accent);
  margin-bottom: 1.2rem;
}

.hero-line {
  font-family: var(--font-cn);
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-weight: 400;
  color: var(--text-secondary);
  line-height: 2.2;
  letter-spacing: 0.12em;
}

.hero-typing-wrap {
  margin-top: 1.5rem;
  font-family: var(--font-cn);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  font-weight: 500;
  color: var(--accent);
  min-height: 1.8em;
  letter-spacing: 0.1em;
}

.hero-cursor {
  display: inline-block;
  margin-left: 2px;
  font-weight: 300;
  color: var(--accent);
  animation: blink 0.8s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

[data-theme="dark"] .hero-greeting {
  color: var(--accent-light);
}
[data-theme="dark"] .hero-typing-wrap {
  color: var(--accent-light);
}
[data-theme="dark"] .hero-cursor {
  color: var(--accent-light);
}

@media (max-width: 900px) {
  .hero-text {
    left: 5%;
    right: 5%;
    top: 8%;
    transform: none;
    text-align: center;
    max-width: none;
  }
  .hero-greeting {
    font-size: clamp(2.2rem, 8vw, 3rem);
  }
  .hero-line {
    font-size: clamp(0.9rem, 3vw, 1rem);
  }
  .hero-typing-wrap {
    font-size: clamp(0.9rem, 3vw, 1.05rem);
  }
}

@media (max-width: 480px) {
  .hero-text {
    top: 6%;
  }
}

/* ============================================================
   CARD SWAP (faithful replica of React Bits CardSwap)
   ============================================================ */
.card-swap-section {
  position: relative;
  height: calc(100vh - 64px);
  z-index: 2;
}

.card-swap-container {
  position: absolute;
  bottom: 3%;
  right: 8%;
  transform: translate(7%, 24%);
  transform-origin: bottom right;
  perspective: 900px;
  overflow: visible;
}

.card-swap-container .card {
  position: absolute;
  top: 50%;
  left: 50%;
  border-radius: 12px;
  border: 1px solid #ddd0b0;
  background: #000;
  transform-style: preserve-3d;
  will-change: transform;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  overflow: hidden;
  cursor: pointer;
}

/* Card header bar */
.card-header {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 44px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
  background: rgba(0,0,0,0.4);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  z-index: 4;
  color: rgba(255,255,255,0.9);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.03em;
}

.card-header svg {
  width: 16px;
  height: 16px;
  opacity: 0.7;
  flex-shrink: 0;
}

.card-cta {
  margin-left: 10px;
  font-size: 0.78rem;
  font-weight: 700;
  opacity: 0;
  transition: opacity 0.3s ease;
  white-space: nowrap;
  padding: 2px 10px;
  border: 1.5px solid currentColor;
  border-radius: 20px;
  letter-spacing: 0.04em;
}

.card-cta.active {
  opacity: 1;
}

/* Card body — the main visual area */
.card-body {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
}

.card-symbol {
  position: relative;
  z-index: 2;
  font-size: clamp(4rem, 10vw, 8rem);
  font-weight: 300;
  color: var(--accent, #3B82F6);
  line-height: 1;
  opacity: 0.85;
  text-shadow: 0 0 40px var(--accent, #3B82F6);
}

.card-glow {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

/* PixelCanvas on cards */
.card-swap-container .card .pixel-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 3;
  border-radius: 12px;
}

/* Radial glow on hover (like original PixelCard ::before) */
.card-swap-container .card::before {
  content: '';
  position: absolute;
  inset: 0;
  margin: auto;
  aspect-ratio: 1;
  background: radial-gradient(circle, rgba(255,255,255,0.08), transparent 85%);
  opacity: 0;
  transition: opacity 800ms cubic-bezier(0.5, 1, 0.89, 1);
  pointer-events: none;
  z-index: 2;
}

.card-swap-container .card:hover::before {
  opacity: 1;
}

@media (max-width: 768px) {
  .card-swap-container {
    transform: scale(0.75) translate(25%, 25%);
  }
}

@media (max-width: 480px) {
  .card-swap-container {
    transform: scale(0.55) translate(25%, 25%);
  }
}
/* ============================================================
   TIMELINE
   ============================================================ */
.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: var(--border);
}
.timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
  padding-left: 1.75rem;
}
.timeline-item:last-child { margin-bottom: 0; }
.timeline-item::before {
  content: '';
  position: absolute;
  left: -2.85rem;
  top: 0.45rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 2px var(--accent);
  transition: transform 0.3s ease;
}
.timeline-item:hover::before { transform: scale(1.4); }
.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 0.25rem;
}
.timeline-title { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.2rem; }
.timeline-sub {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  font-weight: 500;
}
.timeline-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}
.timeline-desc ul { list-style: none; padding: 0; }
.timeline-desc li {
  position: relative;
  padding-left: 1rem;
  margin-bottom: 0.3rem;
}
.timeline-desc li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--text-muted);
}

/* ============================================================
   SCROLL REVEAL ANIMATIONS
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: all 0.7s var(--ease-out);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* ============================================================
   PLACEHOLDER
   ============================================================ */
.placeholder {
  background: var(--surface);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 3rem 2rem;
  text-align: center;
  transition: all var(--transition);
}
.placeholder:hover { border-color: var(--accent-border); }
.placeholder-icon { font-size: 2.5rem; margin-bottom: 0.75rem; opacity: 0.6; }
.placeholder-text { color: var(--text-secondary); font-size: 0.95rem; }
.placeholder-hint { font-size: 0.8rem; color: var(--text-muted); margin-top: 0.25rem; }

/* ============================================================
   THEME TRANSITION
   ============================================================ */
.theme-transitioning,
.theme-transitioning * {
  transition: background-color 0.3s ease,
              color 0.3s ease,
              border-color 0.3s ease,
              box-shadow 0.3s ease !important;
}

/* ============================================================
   FLOWING MENU
   ============================================================ */
.menu-wrap {
  width: 100%;
  overflow: hidden;
  position: relative;
}

.menu {
  display: flex;
  flex-direction: column;
  height: 100%;
  margin: 0;
  padding: 0;
}

.menu__item {
  flex: 1;
  position: relative;
  overflow: hidden;
  text-align: center;
  border-top: 1px solid;
}

.menu__item:first-child {
  border-top: none;
}

.menu__item-link {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  position: relative;
  cursor: pointer;
  text-transform: uppercase;
  text-decoration: none;
  white-space: nowrap;
  font-weight: 600;
  font-size: clamp(1.2rem, 4vh, 2.4rem);
  transition: letter-spacing 0.3s ease;
  z-index: 2;
}

.menu__item-link:hover {
  letter-spacing: 0.08em;
}

.marquee {
  position: absolute;
  top: 0;
  left: 0;
  overflow: hidden;
  width: 100%;
  height: 100%;
  pointer-events: none;
  transform: translate3d(0, 101%, 0);
  z-index: 1;
}

.marquee__inner-wrap {
  height: 100%;
  width: 100%;
  overflow: hidden;
}

.marquee__inner {
  display: flex;
  align-items: center;
  position: relative;
  height: 100%;
  width: fit-content;
  will-change: transform;
}

.marquee__part {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.marquee span {
  white-space: nowrap;
  text-transform: uppercase;
  font-weight: 400;
  font-size: clamp(1rem, 3vh, 1.8rem);
  line-height: 1;
  padding: 0 1vw;
}

.marquee__img {
  width: clamp(100px, 12vw, 200px);
  height: clamp(2.5rem, 7vh, 5rem);
  margin: 1em 1.5vw;
  border-radius: 50px;
  background-size: cover;
  background-position: 50% 50%;
}

@media (max-width: 768px) {
  .menu__item-link {
    font-size: 1rem;
  }
  .marquee span {
    font-size: 0.85rem;
  }
  .marquee__img {
    width: 80px;
    height: 2rem;
    margin: 0.5em 1vw;
  }
}

/* ============================================================
   ABOUT HERO (homepage)
   ============================================================ */
.about-hero {
  min-height: 45vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6rem 2rem 4rem;
  position: relative;
  overflow: hidden;
  z-index: 2;
}

.about-inner {
  max-width: 680px;
}

.about-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 1rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  font-family: var(--font-mono);
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-subtle);
  border: 1px solid var(--accent-border);
}

.about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.6rem;
  line-height: 1.15;
  color: var(--text);
}

.about-hero .tagline {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  font-weight: 400;
}

.about-hero .bio {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 520px;
  margin: 0 auto;
}

.about-hero .divider {
  width: 40px;
  height: 2px;
  background: var(--accent);
  margin: 1.5rem auto;
  border-radius: 2px;
  opacity: 0.5;
}

/* ============================================================
   MENU SECTION
   ============================================================ */
.menu-section {
  height: 55vh;
  position: relative;
  z-index: 2;
}