:root {
  --bg: #08111f;
  --bg-secondary: #0f1d33;
  --panel: rgba(8, 17, 31, 0.72);
  --panel-strong: rgba(10, 22, 41, 0.9);
  --text: #f7f5ef;
  --muted: #a7b3c9;
  --line: rgba(179, 197, 230, 0.16);
  --accent: #f3b45d;
  --accent-strong: #ff7b54;
  --accent-cool: #7ee0d7;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.32);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 16px;
  --max-width: 1180px;
  --section-gap: 120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Bahnschrift", "Segoe UI Variable", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(243, 180, 93, 0.18), transparent 35%),
    radial-gradient(circle at 85% 10%, rgba(126, 224, 215, 0.16), transparent 30%),
    linear-gradient(145deg, #08111f 0%, #0d1627 48%, #101f37 100%);
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  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: radial-gradient(circle at center, black 35%, transparent 100%);
}

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

button {
  font: inherit;
}

.page-shell {
  width: min(calc(100% - 40px), var(--max-width));
  margin: 0 auto;
  padding-bottom: 48px;
}

.hero {
  padding: 26px 0 64px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0 32px;
}

.nav__brand {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100px;
  height: 54px;
  border: 1px solid var(--line);
  border-radius: 18px;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(14px);
}

.nav__links {
  display: flex;
  gap: 20px;
  color: var(--muted);
}

.nav__links a {
  transition: color 180ms ease, transform 180ms ease;
}

.nav__links a:hover,
.nav__links a:focus-visible {
  color: var(--text);
  transform: translateY(-1px);
}

.hero__content {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  gap: 32px;
  align-items: stretch;
}

.hero__intro,
.hero__panel,
.highlight-card,
.skill-card,
.project-card,
.timeline-card,
.contact-card {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 720ms ease,
    transform 720ms ease;
}

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

.hero__eyebrow,
.section__eyebrow,
.project-card__tag {
  margin: 0 0 14px;
  color: var(--accent);
  letter-spacing: 0.18em;
  font-size: 0.78rem;
  font-weight: 700;
}

.hero__intro h1,
.section__heading h2 {
  margin: 0;
  line-height: 1.08;
}

.hero__intro h1 {
  max-width: 10ch;
  font-size: clamp(3.4rem, 10vw, 6.2rem);
}

.hero__summary,
.section__summary,
.highlight-card p,
.skill-card p,
.project-card p,
.timeline-card p,
.contact-card p {
  color: var(--muted);
  line-height: 1.8;
}

.hero__summary {
  max-width: 62ch;
  margin: 24px 0 0;
  font-size: 1.02rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background 180ms ease;
}

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

.button--primary {
  color: #09111d;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent) 0%, #ffd28b 100%);
}

.button--ghost {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.04);
}

.hero__metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 42px 0 0;
  padding: 0;
  list-style: none;
}

.metric-card {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(10px);
}

.metric-card strong {
  display: block;
  margin-bottom: 8px;
  font-size: 1.9rem;
}

.metric-card span {
  color: var(--muted);
}

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

.glass-card,
.mini-card,
.highlight-card,
.skill-card,
.project-card,
.timeline-card,
.contact-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--panel);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}

.glass-card {
  padding: 28px;
}

.glass-card__label {
  margin: 0 0 12px;
  color: var(--accent-cool);
  letter-spacing: 0.14em;
  font-size: 0.8rem;
}

.glass-card h2 {
  margin: 0;
  font-size: 2rem;
}

.glass-card__list {
  margin: 18px 0 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.9;
}

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

.mini-card {
  padding: 22px;
}

.mini-card__title {
  display: block;
  margin-bottom: 12px;
  color: var(--muted);
}

.mini-card__list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.mini-card__list li {
  position: relative;
  padding-left: 18px;
  line-height: 1.7;
  font-size: 1.2rem;
  font-weight: 700;
}

.mini-card__list li::before {
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 999px;
  content: "";
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-cool) 100%);
}

.section {
  padding-top: var(--section-gap);
}

.section--highlight {
  padding-top: 36px;
}

.section__heading {
  display: grid;
  gap: 18px;
  max-width: 760px;
}

.section__heading h2 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
}

.highlights,
.skills-grid,
.project-grid {
  display: grid;
  gap: 18px;
  margin-top: 34px;
}

.highlights {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.highlight-card,
.skill-card,
.project-card,
.timeline-card,
.contact-card {
  padding: 28px;
}

.highlight-card h3,
.skill-card h3,
.project-card h3,
.timeline-card h3 {
  margin-top: 0;
  margin-bottom: 14px;
  font-size: 1.28rem;
}

.skills-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.skill-card__chips,
.project-card__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.chip {
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.08);
  font-size: 0.88rem;
}

.project-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.filter-button {
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.04);
  cursor: pointer;
  transition:
    color 180ms ease,
    background 180ms ease,
    transform 180ms ease;
}

.filter-button:hover,
.filter-button:focus-visible,
.filter-button.is-active {
  color: #08111f;
  background: var(--accent-cool);
  transform: translateY(-1px);
}

.project-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.project-card {
  display: grid;
  gap: 10px;
}

.project-card__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid rgba(126, 224, 215, 0.28);
  border-radius: 999px;
  color: var(--accent-cool);
  background: rgba(126, 224, 215, 0.08);
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background 180ms ease,
    color 180ms ease;
}

.project-card__link:hover,
.project-card__link:focus-visible {
  color: #08111f;
  background: var(--accent-cool);
  border-color: var(--accent-cool);
  transform: translateY(-1px);
}

.project-card__meta,
.timeline-card__meta {
  color: var(--accent-cool);
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.timeline {
  display: grid;
  gap: 18px;
  margin-top: 34px;
}

.timeline-card {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}

.timeline-card ul {
  margin: 12px 0 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.9;
}

.section--split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 380px);
  gap: 24px;
  align-items: start;
}

.contact-card {
  display: grid;
  gap: 18px;
  background: linear-gradient(180deg, rgba(10, 22, 41, 0.94), rgba(18, 32, 58, 0.88));
}

.contact-item {
  display: grid;
  gap: 8px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.contact-item:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.contact-item__label {
  color: var(--accent-cool);
  font-size: 0.86rem;
  letter-spacing: 0.14em;
  font-weight: 700;
}

.contact-item__value {
  margin: 0;
  color: var(--text);
  line-height: 1.8;
}

.contact-card a {
  font-size: 1.08rem;
  word-break: break-all;
}

.contact-card a:hover,
.contact-card a:focus-visible {
  color: var(--accent);
}

.back-to-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 20;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 72px;
  min-height: 36px;
  padding: 0 14px;
  border: 1px solid rgba(243, 180, 93, 0.28);
  border-radius: 999px;
  color: #08111f;
  background: linear-gradient(135deg, var(--accent) 0%, #ffd28b 100%);
  font-size: 0.92rem;
  font-weight: 700;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.22);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition:
    opacity 180ms ease,
    visibility 180ms ease,
    transform 180ms ease,
    box-shadow 180ms ease;
}

.back-to-top:hover,
.back-to-top:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.26);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

@media (max-width: 1024px) {
  :root {
    --section-gap: 96px;
  }

  .hero__content,
  .section--split,
  .skills-grid,
  .project-grid,
  .highlights {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 720px) {
  .page-shell {
    width: min(calc(100% - 28px), var(--max-width));
  }

  .nav {
    flex-direction: column;
    gap: 18px;
  }

  .nav__links {
    flex-wrap: wrap;
    justify-content: center;
  }

  .hero__intro h1 {
    max-width: none;
  }

  .hero__metrics,
  .mini-grid {
    grid-template-columns: 1fr;
  }

  .glass-card,
  .mini-card,
  .highlight-card,
  .skill-card,
  .project-card,
  .timeline-card,
  .contact-card {
    padding: 22px;
    border-radius: 22px;
  }

  .back-to-top {
    right: 12px;
    bottom: 12px;
    min-width: 66px;
    min-height: 34px;
    padding: 0 12px;
    font-size: 0.88rem;
  }
}