:root {
  --bg: #09111f;
  --bg-soft: rgba(15, 28, 49, 0.72);
  --panel: rgba(14, 24, 42, 0.88);
  --panel-strong: rgba(11, 19, 33, 0.98);
  --line: rgba(144, 198, 255, 0.18);
  --text: #ebf3ff;
  --muted: #9cb5d6;
  --accent: #78e4ff;
  --accent-strong: #31b8ff;
  --warm: #ffd978;
  --shadow: 0 14px 36px rgba(0, 0, 0, 0.22);
  --font-sans: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-display: "Aptos", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(49, 184, 255, 0.22), transparent 26%),
    radial-gradient(circle at 80% 20%, rgba(120, 228, 255, 0.16), transparent 18%),
    linear-gradient(180deg, #07101d 0%, #0c172b 42%, #09111f 100%);
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.8), transparent);
  pointer-events: none;
}

a {
  color: inherit;
  text-decoration: none;
}

.page-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding-bottom: 72px;
}

.site-header {
  position: sticky;
  top: 18px;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 18px;
  padding: 16px 20px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(8, 15, 28, 0.75);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

[data-lang-en] {
  display: none;
}

body[data-lang="en"] [data-lang-zh] {
  display: none !important;
}

body[data-lang="en"] [data-lang-en] {
  display: block;
}

body[data-lang="en"] span[data-lang-en],
body[data-lang="en"] strong[data-lang-en] {
  display: inline;
}

body[data-lang="zh"] [data-lang-en] {
  display: none !important;
}

.brand,
.site-nav a,
.button,
.project-tag,
.signal-label,
.eyebrow {
  font-family: var(--font-display);
}

.brand {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  gap: 18px;
  color: var(--muted);
  font-size: 0.95rem;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lang-toggle {
  display: inline-flex;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
}

.lang-button {
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 8px 12px;
  border-radius: 999px;
  font-family: var(--font-display);
  font-weight: 800;
  cursor: pointer;
}

.lang-button.is-active {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #03111d;
}

.site-nav a:hover,
.contact-links a:hover {
  color: var(--accent);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(320px, 0.9fr);
  gap: 34px;
  align-items: center;
  min-height: calc(100vh - 120px);
  padding: 52px 0 28px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1,
.section-heading h2,
.timeline-item h3,
.project-card h3,
.focus-card h3 {
  margin: 0;
  font-family: var(--font-display);
}

.hero h1 {
  font-size: clamp(3.4rem, 9vw, 6.8rem);
  line-height: 0.95;
}

.hero-title-cn {
  margin: 16px 0 0;
  color: var(--warm);
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2vw, 1.55rem);
  font-weight: 800;
  letter-spacing: 0.08em;
}

.hero-lead {
  max-width: 660px;
  margin: 22px 0 0;
  color: #d6e3f8;
  font-size: 1.14rem;
  line-height: 1.85;
}

.hero-lead span {
  color: var(--warm);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.hero-meta span {
  padding: 10px 14px;
  border: 1px solid rgba(120, 228, 255, 0.14);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: #d8e8ff;
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 700;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 150px;
  padding: 13px 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #03111d;
}

.button-secondary {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.03);
}

.hero-panel {
  display: grid;
  gap: 22px;
  justify-items: center;
}

.identity-card,
.statement-card {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02));
  box-shadow: var(--shadow);
}

.identity-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 22px;
}

.identity-avatar {
  display: grid;
  place-items: center;
  width: 60px;
  height: 60px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(120, 228, 255, 0.9), rgba(49, 184, 255, 0.9));
  color: #06101b;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
}

.identity-name,
.identity-role,
.statement-label,
.award-badge {
  font-family: var(--font-display);
}

.identity-name {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 800;
}

.identity-role {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.signal-card,
.card,
.project-card,
.contact-card {
  border: 1px solid var(--line);
  border-radius: 28px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.02));
  box-shadow: var(--shadow);
}

.signal-card {
  width: 100%;
  padding: 22px 24px;
}

.signal-label {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.signal-card ul {
  margin: 0;
  padding-left: 18px;
  color: #d8e8ff;
  line-height: 1.9;
}

.orbit {
  position: relative;
  width: min(100%, 360px);
  aspect-ratio: 1;
  border: 1px solid rgba(120, 228, 255, 0.2);
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(120, 228, 255, 0.12), transparent 56%),
    linear-gradient(180deg, rgba(49, 184, 255, 0.09), rgba(255, 255, 255, 0.01));
}

.orbit::before,
.orbit::after {
  content: "";
  position: absolute;
  inset: 14%;
  border-radius: 50%;
  border: 1px dashed rgba(120, 228, 255, 0.14);
}

.orbit::after {
  inset: 28%;
}

.orbit-core,
.orbit-node {
  position: absolute;
  display: grid;
  place-items: center;
  border-radius: 999px;
}

.orbit-core {
  inset: 50%;
  width: 92px;
  height: 92px;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle at 30% 30%, #9df4ff, #31b8ff 70%, #1595d7);
  color: #04111d;
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 800;
  box-shadow: 0 0 24px rgba(49, 184, 255, 0.28);
}

.orbit-node {
  min-width: 84px;
  padding: 10px 14px;
  border: 1px solid rgba(120, 228, 255, 0.22);
  background: var(--panel-strong);
  color: #dff5ff;
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 700;
}

.orbit-node-1 { top: 8%; left: 50%; transform: translateX(-50%); }
.orbit-node-2 { right: 6%; top: 50%; transform: translateY(-50%); }
.orbit-node-3 { bottom: 10%; left: 50%; transform: translateX(-50%); }
.orbit-node-4 { left: 4%; top: 50%; transform: translateY(-50%); }

.section {
  padding: 48px 0 0;
}

.section-heading {
  margin-bottom: 24px;
}

.section-heading h2 {
  font-size: clamp(1.9rem, 3vw, 3rem);
  line-height: 1.08;
}

.about-grid,
.focus-grid,
.project-grid,
.skills-grid,
.awards-grid,
.coursework-grid,
.reading-grid {
  display: grid;
  gap: 22px;
}

.about-grid {
  grid-template-columns: 1.2fr 0.9fr;
}

.focus-grid,
.project-grid,
.skills-grid,
.awards-grid,
.coursework-grid,
.reading-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card,
.project-card {
  padding: 24px;
}

.card p,
.project-card p,
.timeline-item p,
.contact-card p {
  margin: 0;
  color: #d1def4;
  line-height: 1.9;
}

.card p + p {
  margin-top: 14px;
}

.statement-card {
  margin-top: 22px;
  padding: 24px;
}

.statement-label {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.stats-card {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.stats-card div {
  padding: 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.stats-card span {
  display: block;
  color: var(--muted);
  font-size: 0.88rem;
}

.stats-card strong {
  display: block;
  margin-top: 8px;
  font-size: 1.08rem;
}

.focus-card h3,
.project-card h3,
.timeline-item h3,
.skill-card h3,
.card h3 {
  margin-bottom: 12px;
  font-size: 1.25rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.tag-list li {
  padding: 10px 14px;
  border: 1px solid rgba(120, 228, 255, 0.16);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: #dff0ff;
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 700;
}

.project-tag {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}

.project-meta span,
.award-badge {
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(120, 228, 255, 0.16);
  background: rgba(255, 255, 255, 0.04);
  color: #dff0ff;
  font-size: 0.82rem;
  font-weight: 700;
}

.inline-link {
  display: inline-flex;
  margin-top: 18px;
  color: var(--accent);
  font-family: var(--font-display);
  font-weight: 700;
}

.inline-link:hover {
  color: var(--warm);
}

.project-card {
  position: relative;
  overflow: hidden;
}

.project-card::after {
  content: "";
  position: absolute;
  inset: auto -20% -40% auto;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(120, 228, 255, 0.12), transparent 70%);
  pointer-events: none;
}

.award-card {
  min-height: 100%;
}

.timeline-section {
  padding-top: 56px;
}

.timeline {
  display: grid;
  gap: 18px;
}

.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 18px;
  padding: 22px 22px 22px 10px;
  border-left: 1px solid rgba(120, 228, 255, 0.18);
}

.timeline-dot {
  width: 14px;
  height: 14px;
  margin-top: 6px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--warm), var(--accent));
  box-shadow: 0 0 18px rgba(120, 228, 255, 0.34);
}

.contact-section {
  padding-top: 60px;
}

.contact-card {
  padding: 28px;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 20px 0 12px;
}

.contact-links a {
  padding: 12px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  font-family: var(--font-display);
  font-weight: 700;
}

.friend-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 0 0 18px;
}

.friend-links-label {
  margin: 0;
  color: var(--muted) !important;
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.friend-links a {
  color: var(--accent);
  font-family: var(--font-display);
  font-weight: 700;
}

.contact-note {
  color: var(--muted) !important;
  font-size: 0.96rem;
}

.resume-body {
  min-height: 100vh;
}

.resume-shell {
  width: min(920px, calc(100% - 32px));
  margin: 40px auto;
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: 32px;
  background: rgba(8, 15, 28, 0.82);
  box-shadow: var(--shadow);
}

.resume-header {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(120, 228, 255, 0.14);
}

.resume-header h1,
.resume-section h2,
.resume-item h3 {
  margin: 0;
  font-family: var(--font-display);
}

.resume-subtitle {
  margin: 14px 0 0;
  color: #d1def4;
}

.resume-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-end;
}

.resume-links a {
  color: var(--accent);
  font-family: var(--font-display);
  font-weight: 700;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .button,
  .reveal {
    transition: none !important;
  }

  .reveal,
  .reveal.visible {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 900px), (pointer: coarse) {
  body::before {
    display: none;
  }

  .site-header {
    backdrop-filter: none;
  }

  .project-card::after {
    display: none;
  }
}

.resume-section {
  padding-top: 28px;
}

.resume-section h2 {
  margin-bottom: 14px;
  font-size: 1.2rem;
}

.resume-item {
  display: flex;
  justify-content: space-between;
  gap: 18px;
}

.resume-item.stack {
  display: block;
}

.resume-list {
  margin: 0;
  padding-left: 18px;
  line-height: 1.9;
  color: #d1def4;
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 700ms ease, transform 700ms ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 980px) {
  .hero,
  .about-grid,
  .focus-grid,
  .project-grid,
  .skills-grid,
  .coursework-grid,
  .reading-grid,
  .awards-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 44px;
  }

  .hero-panel {
    justify-items: stretch;
  }

  .orbit {
    margin: 0 auto;
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(100% - 24px, 1180px);
  }

  .site-header {
    position: static;
    flex-direction: column;
    gap: 14px;
    align-items: flex-start;
  }

  .toolbar {
    width: 100%;
  }

  .site-nav {
    flex-wrap: wrap;
    gap: 12px;
  }

  .hero h1 {
    font-size: clamp(2.8rem, 18vw, 4.4rem);
  }

  .hero-lead {
    font-size: 1rem;
  }

  .stats-card {
    grid-template-columns: 1fr;
  }

  .orbit {
    width: 100%;
    max-width: 320px;
  }

  .resume-header,
  .resume-item {
    flex-direction: column;
  }

  .resume-links {
    align-items: flex-start;
  }

  .orbit-node {
    min-width: 72px;
    font-size: 0.75rem;
  }
}