/* ===== SOFT GEEK AESTHETIC ===== */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;600;700&family=Noto+Sans+SC:wght@300;400;500;600;700&display=swap');

:root {
  --bg: #faf8f5;
  --bg-alt: #f2efe9;
  --bg-card: #ffffff;
  --bg-elevated: #f7f5f0;
  --border: #e4dfd7;
  --border-soft: #ece8e1;

  --text: #3d3a36;
  --text-dim: #8a857d;
  --text-bright: #1a1816;

  --green: #4a7c6f;
  --green-soft: #4a7c6f18;
  --green-mid: #4a7c6f30;
  --teal: #5b8a8a;
  --teal-soft: #5b8a8a18;
  --amber: #b8860b;
  --amber-soft: #b8860b12;
  --red: #c0392b;
  --red-soft: #c0392b15;

  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;

  --max-width: 1200px;
  --radius: 6px;
  --radius-lg: 10px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --shadow: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.1);
}

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

html { scroll-behavior: smooth; font-size: 16px; }

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

/* Subtle dot pattern */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background-image: radial-gradient(circle, var(--border) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.4;
}

a { color: var(--green); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--teal); }

img { max-width: 100%; height: auto; display: block; }

::selection { background: var(--green-mid); color: var(--text-bright); }

/* ===== LAYOUT ===== */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-alt { background: var(--bg-alt); }

.section-title {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.section-title::before {
  content: "> ";
  color: var(--green);
  font-weight: 400;
  opacity: 0.6;
}

.section-subtitle {
  font-size: 0.95rem;
  color: var(--text-dim);
  margin-bottom: 48px;
  font-family: var(--font-mono);
  font-weight: 300;
}

/* ===== NAVBAR ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(250, 248, 245, 0.9);
  backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border-soft);
  z-index: 1000;
  transition: box-shadow var(--transition);
}

.navbar.scrolled {
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--green);
  letter-spacing: -0.05em;
}
.nav-logo .dot { color: var(--text-dim); opacity: 0.4; }

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
  align-items: center;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 4px 0;
  position: relative;
  transition: color var(--transition);
}
.nav-links a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--green);
  transition: width var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--green);
}
.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* Language Toggle */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  user-select: none;
}

.lang-toggle span {
  padding: 4px 10px;
  color: var(--text-dim);
  transition: all var(--transition);
  letter-spacing: 0.05em;
}

.lang-toggle span.active {
  background: var(--green);
  color: #fff;
}

/* Mobile toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--text-dim);
  transition: transform var(--transition), opacity var(--transition);
}

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(160deg, var(--bg) 0%, var(--bg-alt) 50%, #ede8df 100%);
}

/* Soft gradient orbs */
.hero::before {
  content: "";
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--green-soft) 0%, transparent 70%);
  top: -150px;
  right: -80px;
  animation: orbFloat 18s ease-in-out infinite;
}
.hero::after {
  content: "";
  position: absolute;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--teal-soft) 0%, transparent 70%);
  bottom: -100px;
  left: -80px;
  animation: orbFloat 22s ease-in-out infinite reverse;
}

@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(20px, -15px) scale(1.03); }
  66% { transform: translate(-15px, 10px) scale(0.97); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.hero-prompt {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-bottom: 24px;
  letter-spacing: 0.05em;
}
.hero-prompt .cursor {
  display: inline-block;
  width: 7px;
  height: 15px;
  background: var(--green);
  margin-left: 3px;
  animation: blink 1.1s step-end infinite;
  vertical-align: middle;
  opacity: 0.7;
}

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

.hero h1 {
  font-family: var(--font-mono);
  font-size: 3.2rem;
  font-weight: 800;
  color: var(--text-bright);
  margin-bottom: 16px;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.hero .tagline {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--green);
  font-weight: 500;
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

.hero .description {
  font-size: 0.95rem;
  color: var(--text-dim);
  max-width: 520px;
  margin: 0 auto 40px;
  line-height: 1.9;
}

.hero-btns {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  border-radius: var(--radius);
}

.btn-primary {
  background: var(--green);
  color: #fff;
  border: 1px solid var(--green);
}
.btn-primary:hover {
  background: var(--teal);
  border-color: var(--teal);
  color: #fff;
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
}
.btn-outline:hover {
  border-color: var(--green);
  color: var(--green);
  transform: translateY(-1px);
}

/* ===== CARDS ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.card:hover {
  border-color: var(--green-mid);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  margin-bottom: 16px;
  color: var(--green);
  font-family: var(--font-mono);
  font-weight: 700;
}

.card h3 {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--text-bright);
  margin-bottom: 8px;
  font-weight: 600;
}

.card p {
  color: var(--text-dim);
  font-size: 0.88rem;
  line-height: 1.7;
}

/* ===== PAGE HERO (sub-pages) ===== */
.page-hero {
  padding: 120px 0 60px;
  text-align: center;
  position: relative;
  border-bottom: 1px solid var(--border-soft);
  background: linear-gradient(160deg, var(--bg) 0%, var(--bg-alt) 100%);
}

.page-hero h1 {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-bright);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.page-hero p {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--text-dim);
  max-width: 600px;
  margin: 0 auto;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 24px;
}

.tech-tag {
  padding: 4px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--green);
  letter-spacing: 0.03em;
}

/* ===== ARCHITECTURE FLOW ===== */
.arch-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
  padding: 40px 0;
}

.arch-step {
  text-align: center;
  padding: 24px 16px;
  min-width: 160px;
}

.arch-step .step-num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--green);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  margin: 0 auto 12px;
  color: var(--green);
}

.arch-step h4 {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-bright);
  margin-bottom: 4px;
  font-weight: 600;
}

.arch-step p {
  font-size: 0.78rem;
  color: var(--text-dim);
}

.arch-arrow {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  color: var(--green);
  opacity: 0.35;
}

/* ===== STATS ===== */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin: 40px 0;
}

.stat-card {
  text-align: center;
  padding: 28px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}
.stat-card:hover {
  border-color: var(--green-mid);
  box-shadow: var(--shadow);
}

.stat-number {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--green);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ===== TABLE ===== */
.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  margin: 32px 0;
  box-shadow: var(--shadow-sm);
}

.perf-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.perf-table thead {
  background: var(--bg-elevated);
}

.perf-table th {
  padding: 12px 14px;
  text-align: left;
  font-weight: 600;
  color: var(--green);
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.7rem;
  border-bottom: 1px solid var(--border);
}

.perf-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-soft);
  white-space: nowrap;
  color: var(--text);
}

.perf-table tbody tr {
  transition: background var(--transition);
}
.perf-table tbody tr:hover {
  background: var(--bg-elevated);
}

.perf-table .highlight {
  font-weight: 700;
  color: var(--green);
}

.perf-table .negative {
  color: var(--red);
}

/* ===== GALLERY ===== */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 20px;
}

.gallery-item {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-soft);
  cursor: pointer;
  transition: all var(--transition);
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
}
.gallery-item:hover {
  border-color: var(--green-mid);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.gallery-item img {
  width: 100%;
  height: auto;
}

.gallery-caption {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  text-align: center;
  font-weight: 500;
  border-top: 1px solid var(--border-soft);
}

/* ===== LIGHTBOX ===== */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.88);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 40px;
  cursor: zoom-out;
}
.lightbox.active { display: flex; }
.lightbox img {
  max-width: 95%;
  max-height: 95vh;
  border-radius: var(--radius);
  cursor: default;
  box-shadow: var(--shadow-lg);
}
.lightbox-close {
  position: absolute;
  top: 20px;
  right: 24px;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: rgba(255,255,255,0.6);
  cursor: pointer;
  background: none;
  border: 1px solid rgba(255,255,255,0.2);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  transition: all var(--transition);
}
.lightbox-close:hover {
  color: #fff;
  border-color: rgba(255,255,255,0.5);
}

/* ===== TIMELINE ===== */
.timeline { position: relative; padding-left: 32px; }

.timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1.5px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  margin-bottom: 36px;
  padding-left: 24px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -36px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--green);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 2px var(--green-mid);
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--green);
  font-weight: 600;
  margin-bottom: 4px;
  letter-spacing: 0.05em;
}

.timeline-item h3 {
  font-size: 1.05rem;
  color: var(--text-bright);
  margin-bottom: 4px;
  font-weight: 600;
}

.timeline-item .timeline-desc {
  color: var(--text-dim);
  font-size: 0.88rem;
}

.timeline-item .timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.timeline-tag {
  padding: 2px 10px;
  background: var(--green-soft);
  border-radius: 20px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--green);
  font-weight: 500;
}

/* ===== SKILL TAGS ===== */
.skill-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-tag {
  padding: 6px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--teal);
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}
.skill-tag:hover {
  border-color: var(--green-mid);
  color: var(--green);
  box-shadow: var(--shadow);
}

/* ===== HONOR CARD ===== */
.honor-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  margin-bottom: 12px;
  box-shadow: var(--shadow-sm);
}

.honor-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--amber-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
  color: var(--amber);
}

.honor-card h4 {
  font-size: 0.92rem;
  color: var(--text-bright);
  margin-bottom: 2px;
}

.honor-card p {
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* ===== PLACEHOLDER ===== */
.placeholder {
  text-align: center;
  padding: 60px 24px;
  color: var(--text-dim);
}

.placeholder-icon {
  font-size: 2rem;
  margin-bottom: 16px;
  opacity: 0.25;
  font-family: var(--font-mono);
}

.placeholder h3 {
  font-family: var(--font-mono);
  color: var(--text);
  margin-bottom: 8px;
  font-size: 1rem;
}

/* ===== ARTICLE LIST ===== */
.article-list { display: flex; flex-direction: column; gap: 16px; }

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}
.article-card:hover {
  border-color: var(--green-mid);
  transform: translateX(4px);
  box-shadow: var(--shadow);
}

.article-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--green);
  font-weight: 600;
  margin-bottom: 6px;
  letter-spacing: 0.05em;
}

.article-card h3 {
  font-size: 1.05rem;
  color: var(--text-bright);
  margin-bottom: 6px;
  font-weight: 600;
}

.article-card p {
  color: var(--text-dim);
  font-size: 0.88rem;
  line-height: 1.7;
}

/* ===== FOOTER ===== */
.footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border-soft);
  color: var(--text-dim);
  padding: 40px 0;
  text-align: center;
}

.footer-links {
  display: flex;
  gap: 24px;
  justify-content: center;
  margin-bottom: 20px;
  list-style: none;
}

.footer-links a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.footer-links a:hover { color: var(--green); }

.footer-contact {
  margin-bottom: 12px;
  font-size: 0.85rem;
}
.footer-contact a { color: var(--green); }

.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-dim);
  opacity: 0.5;
}

/* ===== SCROLL ANIMATIONS ===== */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== i18n ===== */
[data-lang="cn"] { display: none; }
body.lang-cn [data-lang="cn"] { display: block; }
body.lang-cn [data-lang="en"] { display: none; }
span[data-lang="cn"], a[data-lang="cn"] { display: none; }
body.lang-cn span[data-lang="cn"], body.lang-cn a[data-lang="cn"] { display: inline; }
body.lang-cn span[data-lang="en"], body.lang-cn a[data-lang="en"] { display: none; }
body.lang-cn .nav-links > li > a[data-lang="en"] { display: none; }
body.lang-cn .nav-links > li > a[data-lang="cn"] { display: inline; }
body.lang-cn .card[data-lang="en"] { display: none; }
body.lang-cn .card[data-lang="cn"] { display: block; }
/* Toggle buttons use data-value, not data-lang */
.lang-toggle span { display: inline-block !important; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  .hero .tagline { font-size: 0.9rem; }
  .section { padding: 48px 0; }
  .section-title { font-size: 1.3rem; }
  .card-grid { grid-template-columns: 1fr; }
  .gallery { grid-template-columns: 1fr; }
  .arch-flow { flex-direction: column; gap: 8px; }
  .arch-arrow { transform: rotate(90deg); }
  .nav-links {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--bg);
    flex-direction: column;
    padding: 16px 24px;
    gap: 12px;
    border-bottom: 1px solid var(--border-soft);
    box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  .hero-btns { flex-direction: column; align-items: center; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .page-hero h1 { font-size: 1.5rem; }
  .honor-card { flex-direction: column; gap: 8px; }
}