:root {
  --bg-deep: #0a0e12;
  --bg-panel: #121920;
  --ink: #e8eef4;
  --ink-muted: #8a9aad;
  --accent: #3dd6c6;
  --accent-dim: #2a9d8f;
  --accent-glow: rgba(61, 214, 198, 0.35);
  --border: rgba(232, 238, 244, 0.08);
  --font-display: "Chakra Petch", system-ui, sans-serif;
  --font-body: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --radius: 14px;
  --header-h: 4.5rem;
  --mesh-cell: 40px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--ink);
  background:
    radial-gradient(circle at 0% 0%, rgba(61, 214, 198, 0.16), transparent 55%),
    radial-gradient(circle at 100% 100%, rgba(138, 154, 173, 0.18), transparent 50%),
    var(--bg-deep);
  overflow-x: hidden;
}

.bg-mesh {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 0;
  background-color: transparent;
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='40' height='40'%3E%3Cline x1='0' y1='0' x2='40' y2='0' stroke='%238a9aad' stroke-opacity='0.2' stroke-width='1'/%3E%3Cline x1='0' y1='0' x2='0' y2='40' stroke='%238a9aad' stroke-opacity='0.2' stroke-width='1'/%3E%3Ccircle cx='0' cy='0' r='1.5' fill='%233dd6c6' fill-opacity='0.38'/%3E%3C/svg%3E"),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='80' height='80'%3E%3Cline x1='0' y1='0' x2='80' y2='0' stroke='%238a9aad' stroke-opacity='0.09' stroke-width='1'/%3E%3Cline x1='0' y1='0' x2='0' y2='80' stroke='%238a9aad' stroke-opacity='0.09' stroke-width='1'/%3E%3Ccircle cx='0' cy='0' r='1' fill='%233dd6c6' fill-opacity='0.2'/%3E%3C/svg%3E");
  background-size: var(--mesh-cell) var(--mesh-cell), calc(var(--mesh-cell) * 2) calc(var(--mesh-cell) * 2);
  background-position: 0 0, calc(var(--mesh-cell) * -0.5) calc(var(--mesh-cell) * -0.5);
  -webkit-mask-image: radial-gradient(
    ellipse 75% 60% at 50% 38%,
    rgba(0, 0, 0, 0.65) 0%,
    rgba(0, 0, 0, 0.22) 52%,
    transparent 82%
  );
  mask-image: radial-gradient(
    ellipse 75% 60% at 50% 38%,
    rgba(0, 0, 0, 0.65) 0%,
    rgba(0, 0, 0, 0.22) 52%,
    transparent 82%
  );
}

.grain {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover {
  color: #6ae8dc;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-h);
  padding: 0.75rem clamp(1.25rem, 4vw, 2.5rem);
  background: linear-gradient(180deg, rgba(10, 14, 18, 0.96) 0%, rgba(10, 14, 18, 0.85) 100%);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  color: inherit;
  text-decoration: none;
}

.brand:hover {
  color: inherit;
}

.brand__logo {
  display: block;
  height: 2.5rem;
  width: auto;
  max-width: min(52vw, 11rem);
  object-fit: contain;
  object-position: left center;
  flex-shrink: 0;
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  min-width: 0;
}

.brand__acronym {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.12em;
  line-height: 1.2;
}

.brand__full {
  font-size: 0.65rem;
  color: var(--ink-muted);
  letter-spacing: 0.04em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 14rem;
}

@media (max-width: 520px) {
  .brand__full {
    display: none;
  }

  .brand__logo {
    max-width: none;
  }
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-panel);
  cursor: pointer;
}

.nav-toggle__bar {
  display: block;
  width: 1.25rem;
  height: 2px;
  margin: 0 auto;
  background: var(--ink);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 3vw, 2rem);
}

.site-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--ink-muted);
}

.site-nav a:hover {
  color: var(--ink);
}

@media (max-width: 720px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    padding: 1rem 1.25rem 1.25rem;
    background: rgba(10, 14, 18, 0.98);
    border-bottom: 1px solid var(--border);
    gap: 0;
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s;
  }

  .site-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .site-nav a {
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--border);
  }

  .site-nav a:last-child {
    border-bottom: none;
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:first-child {
    transform: translateY(4px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:last-child {
    transform: translateY(-4px) rotate(-45deg);
  }
}

main {
  padding: clamp(2.5rem, 6vw, 5rem) clamp(1.25rem, 4vw, 2.5rem) 4rem;
  max-width: 68rem;
  margin: 0 auto;
}

.hero {
  padding-bottom: clamp(3rem, 8vw, 5rem);
}

.hero__eyebrow {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1.25rem;
}

.hero__title {
  margin: 0 0 1.5rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 5.5vw, 3.35rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.hero__title-line {
  display: block;
}

.hero__title-line--accent {
  background: linear-gradient(105deg, var(--accent) 0%, #7ef0e4 45%, var(--accent-dim) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__lead {
  max-width: 36rem;
  margin: 0 0 2rem;
  color: var(--ink-muted);
  font-size: 1.05rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.35rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.btn--primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dim) 100%);
  color: #041210;
  box-shadow: 0 0 0 0 var(--accent-glow);
}

.btn--primary:hover {
  color: #041210;
  transform: translateY(-2px);
  box-shadow: 0 8px 28px var(--accent-glow);
}

.btn--ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--ink);
}

.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.section {
  padding: clamp(2.5rem, 5vw, 3.5rem) 0;
  border-top: 1px solid var(--border);
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.5vw, 1.65rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  margin: 0 0 1.75rem;
}

.about-grid {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .about-grid {
    grid-template-columns: 1.4fr 1fr;
    align-items: start;
  }
}

.about-grid__text {
  margin: 0;
  color: var(--ink-muted);
  font-size: 1.02rem;
}

.pill-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.pill-list li {
  padding: 0.55rem 1rem;
  background: linear-gradient(135deg, rgba(18, 25, 32, 0.55), rgba(18, 25, 32, 0.4));
  border: 1px solid rgba(232, 238, 244, 0.16);
  border-radius: var(--radius);
  font-size: 0.9rem;
  color: var(--ink);
  box-shadow: 0 18px 35px rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(16px);
}

.project-card {
  display: grid;
  gap: 1.5rem;
  padding: clamp(1.5rem, 4vw, 2.25rem);
  background:
    linear-gradient(145deg, rgba(18, 25, 32, 0.82) 0%, rgba(18, 25, 32, 0.6) 38%, rgba(18, 25, 32, 0.35) 100%);
  border: 1px solid rgba(232, 238, 244, 0.14);
  border-radius: calc(var(--radius) + 4px);
  overflow: hidden;
  position: relative;
  box-shadow:
    0 18px 45px rgba(0, 0, 0, 0.65),
    0 0 0 1px rgba(61, 214, 198, 0.08);
  backdrop-filter: blur(22px) saturate(130%);
}

@media (min-width: 768px) {
  .project-card {
    grid-template-columns: 1fr minmax(200px, 32%);
    align-items: center;
  }
}

.project-card::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -20%;
  width: 55%;
  height: 120%;
  background: radial-gradient(ellipse at center, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
  opacity: 0.5;
}

.project-card__body {
  position: relative;
  z-index: 1;
}

.project-card__tag {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.65rem;
}

.project-card__title {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: 1.65rem;
  font-weight: 700;
}

.project-card__desc {
  margin: 0 0 1.25rem;
  color: var(--ink-muted);
  font-size: 0.98rem;
  max-width: 32rem;
}

.project-card__link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 600;
  font-size: 0.95rem;
}

.project-card__link-icon {
  font-size: 1rem;
  transition: transform 0.2s ease;
}

.project-card__link:hover .project-card__link-icon {
  transform: translate(3px, -3px);
}

.project-card__visual {
  position: relative;
  z-index: 1;
  min-height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-card__avatar-shell {
  position: relative;
  width: 132px;
  height: 132px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-card__orbit {
  position: absolute;
  width: 128px;
  height: 128px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  border-top-color: transparent;
  border-right-color: transparent;
  animation: spin 12s linear infinite;
  box-shadow: 0 0 40px var(--accent-glow);
}

.project-card__orbit::after {
  content: "";
  position: absolute;
  inset: 18px;
  border-radius: 50%;
  border: 1px dashed rgba(61, 214, 198, 0.35);
  animation: spin 20s linear infinite reverse;
}

.project-card__avatar {
  position: relative;
  z-index: 1;
  width: 96px;
  height: 96px;
  object-fit: cover;
  border-radius: 22%;
  border: 2px solid rgba(232, 238, 244, 0.12);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.site-footer {
  padding: clamp(2.75rem, 7vw, 4.5rem) clamp(1.5rem, 4vw, 2.75rem);
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(10, 14, 18, 0.78) 0%, rgba(10, 14, 18, 0.46) 40%, rgba(10, 14, 18, 0.3) 100%);
  backdrop-filter: blur(18px);
}

.site-footer__inner {
  max-width: 68rem;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: clamp(1rem, 2.5vw, 1.5rem);
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  max-width: min(100%, 28rem);
}

.site-footer__credit {
  margin: 0;
  font-family: var(--font-display);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--ink-muted);
  opacity: 0.85;
}

.site-footer__mark {
  display: block;
  height: clamp(3.75rem, 12vw, 6rem);
  width: auto;
  max-width: 100%;
  object-fit: contain;
  object-position: center;
  opacity: 0.95;
}

.site-footer__copy {
  margin: 0;
  padding-top: clamp(0.9rem, 2vw, 1.15rem);
  border-top: 1px solid var(--border);
  max-width: 28rem;
  font-size: 0.85rem;
  line-height: 1.65;
  color: var(--ink-muted);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}