/* ============ Design tokens ============ */
:root {
  --bg: #08090c;
  --surface: rgba(255, 255, 255, 0.025);
  --surface-2: rgba(255, 255, 255, 0.05);
  --border: rgba(255, 255, 255, 0.07);
  --border-strong: rgba(255, 255, 255, 0.14);
  --text: #f2f3f5;
  --text-soft: #a6adbb;
  --text-faint: #707a8a;
  --accent: #5eead4;
  --accent-dim: rgba(94, 234, 212, 0.12);
  --accent-line: rgba(94, 234, 212, 0.35);
  --good: #34d399;
  --radius: 14px;
  --font: "Inter", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --serif: "Fraunces", Georgia, serif;
  --mono: "JetBrains Mono", Consolas, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
/* film grain — kills gradient banding, adds texture */
body::after {
  content: "";
  position: fixed; inset: 0; z-index: 3000;
  pointer-events: none;
  opacity: 0.032;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
::selection { background: rgba(94, 234, 212, 0.22); }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
section[id] { scroll-margin-top: 72px; }
.accent { color: var(--accent); }

/* ============ Ambient background ============ */
.bg-orbs { position: fixed; inset: 0; z-index: -1; overflow: hidden; }
.orb {
  position: absolute; border-radius: 50%;
  filter: blur(140px); opacity: 0.1;
}
.orb-1 { width: 560px; height: 560px; background: #14b8a6; top: -180px; right: -140px; }
.orb-2 { width: 480px; height: 480px; background: #4f46e5; bottom: -160px; left: -160px; opacity: 0.07; }
.grid-overlay {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.028) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 100% 55% at 50% -5%, black 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 100% 55% at 50% -5%, black 20%, transparent 70%);
}

/* ============ Nav ============ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(8, 9, 12, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}
.nav.scrolled { border-bottom-color: var(--border); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo {
  font-family: var(--serif); font-weight: 600; font-size: 1.25rem;
  letter-spacing: 0.01em;
}
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a:not(.btn) {
  font-size: 0.86rem; color: var(--text-soft); font-weight: 500;
  letter-spacing: 0.01em;
  transition: color 0.2s;
}
.nav-links a:not(.btn):hover { color: var(--text); }
.menu-toggle { display: none; background: none; border: 0; cursor: pointer; flex-direction: column; gap: 5px; padding: 8px; }
.menu-toggle span { width: 20px; height: 1.5px; background: var(--text); border-radius: 2px; transition: 0.25s; }
.mobile-menu {
  position: fixed; inset: 64px 0 auto 0; z-index: 99;
  background: rgba(8, 9, 12, 0.97); backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  display: flex; flex-direction: column; padding: 12px 24px 20px;
  transform: translateY(-120%); transition: transform 0.3s;
}
.mobile-menu.open { transform: translateY(0); }
.mobile-menu a { padding: 12px 4px; color: var(--text-soft); font-weight: 500; border-bottom: 1px solid var(--border); }
.mobile-menu a:last-child { border-bottom: 0; color: var(--accent); }

/* ============ Buttons ============ */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 12px 26px; border-radius: 999px;
  font-weight: 600; font-size: 0.9rem; letter-spacing: 0.01em;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s, border-color 0.2s, color 0.2s;
}
.btn-sm { padding: 7px 18px; font-size: 0.84rem; }
.btn-primary { background: var(--accent); color: #052e28; }
.btn-primary:hover {
  transform: translateY(-2px);
  background: #8ff5e4;
  box-shadow: 0 12px 32px -10px rgba(94, 234, 212, 0.45);
}
.btn-ghost { border: 1px solid var(--border-strong); color: var(--text); background: transparent; }
.btn-ghost:hover { border-color: rgba(255, 255, 255, 0.32); background: var(--surface-2); transform: translateY(-2px); }

/* ============ Hero ============ */
.hero { min-height: 100svh; display: flex; align-items: center; position: relative; padding: 120px 0 90px; }
.hero-inner { display: grid; grid-template-columns: 1.12fr 0.88fr; gap: 64px; align-items: center; width: 100%; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.06em;
  color: var(--text-soft);
  border: 1px solid var(--border); background: var(--surface);
  padding: 7px 16px; border-radius: 999px; margin-bottom: 28px;
}
.hero-eyebrow .dot { flex-shrink: 0; }
.dot { width: 6px; height: 6px; border-radius: 50%; background: var(--good); box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.5); animation: pulse 2.4s infinite; }
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.45); }
  70% { box-shadow: 0 0 0 9px rgba(52, 211, 153, 0); }
  100% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0); }
}
.hero h1 {
  font-family: var(--serif);
  font-size: clamp(3.2rem, 8vw, 5.4rem);
  font-weight: 560; letter-spacing: -0.02em; line-height: 1;
  font-variation-settings: "opsz" 144;
}
.hero-role {
  display: flex; align-items: center; gap: 14px;
  font-size: 1.06rem; font-weight: 500; color: var(--text-soft);
  margin: 20px 0 22px; letter-spacing: 0.01em;
}
.hero-role::before { content: ""; width: 34px; height: 1px; background: var(--accent); flex-shrink: 0; }
.hero-role .accent { color: var(--accent); font-weight: 400; }
.hero-desc { color: var(--text-soft); font-size: 1rem; max-width: 540px; margin-bottom: 36px; }
.hero-desc strong { color: var(--text); font-weight: 600; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; margin-bottom: 52px; }
.hero-stats { display: flex; flex-wrap: wrap; }
.stat { display: flex; flex-direction: column; padding-right: 36px; }
.stat + .stat { border-left: 1px solid var(--border); padding-left: 36px; }
.stat-value { display: flex; align-items: baseline; gap: 2px; line-height: 1; }
.stat-num { font-family: var(--serif); font-size: 2.5rem; font-weight: 560; letter-spacing: -0.02em; }
.stat-plus { font-family: var(--serif); font-size: 1.5rem; font-weight: 500; color: var(--accent); }
.stat-label { font-size: 0.78rem; color: var(--text-faint); margin-top: 8px; letter-spacing: 0.02em; }

/* terminal */
.terminal {
  background: rgba(13, 15, 20, 0.72);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  overflow: hidden;
  backdrop-filter: blur(8px);
  box-shadow:
    0 40px 90px -30px rgba(0, 0, 0, 0.7),
    0 0 100px -40px rgba(94, 234, 212, 0.28);
  font-family: var(--mono); font-size: 0.8rem; line-height: 1.75;
  animation: floaty 7s ease-in-out infinite;
}
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
.terminal-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 13px 16px; background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border);
}
.tdot { width: 10px; height: 10px; border-radius: 50%; opacity: 0.85; }
.tdot.red { background: #f87171; } .tdot.yellow { background: #fbbf24; } .tdot.green { background: #34d399; }
.terminal-title { margin-left: auto; font-size: 0.7rem; color: var(--text-faint); }
.terminal-body { padding: 22px 20px 26px; }
.terminal-body p { margin-bottom: 5px; }
.t-prompt { color: var(--accent); }
.t-out { color: var(--text-soft); padding-left: 18px; }
.t-ok { color: var(--good); padding-left: 18px; }
.cursor-blink { animation: blink 1.1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

.scroll-hint {
  position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%);
  color: var(--text-faint); opacity: 0.7; animation: bounce 2.4s infinite;
}
@keyframes bounce { 0%, 100% { transform: translate(-50%, 0); } 50% { transform: translate(-50%, 7px); } }

/* ============ Sections ============ */
.section { padding: 110px 0; }
.section-tag {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--mono); font-size: 0.74rem; color: var(--accent);
  letter-spacing: 0.14em; margin-bottom: 18px;
}
.section-tag::before { content: ""; width: 28px; height: 1px; background: var(--accent-line); }
.section-title {
  font-family: var(--serif);
  font-size: clamp(2rem, 4.6vw, 3rem);
  font-weight: 540; letter-spacing: -0.015em;
  line-height: 1.15; margin-bottom: 56px;
  font-variation-settings: "opsz" 144;
}
.section-title .accent { font-style: italic; font-weight: 480; }

/* about */
.about-grid { display: grid; grid-template-columns: 1.35fr 1fr; gap: 56px; align-items: start; }
.about-text p { color: var(--text-soft); margin-bottom: 18px; font-size: 1.01rem; }
.about-text strong { color: var(--text); font-weight: 600; }
.about-facts { display: flex; flex-direction: column; }
.fact {
  padding: 18px 4px;
  display: flex; flex-direction: column; gap: 3px;
  border-bottom: 1px solid var(--border);
  transition: padding-left 0.25s;
}
.fact:first-child { border-top: 1px solid var(--border); }
.fact:hover { padding-left: 12px; }
.fact:hover .fact-value { color: var(--accent); }
.fact-label { font-family: var(--mono); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--text-faint); }
.fact-value { font-size: 0.95rem; font-weight: 500; transition: color 0.25s; }

/* skills */
.skills-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.skill-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  overflow: hidden;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1), border-color 0.3s, background 0.3s;
}
.skill-card::before {
  content: "";
  position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0; transition: opacity 0.35s;
}
.skill-card:hover {
  transform: translateY(-4px);
  border-color: rgba(94, 234, 212, 0.28);
  background: var(--surface-2);
}
.skill-card:hover::before { opacity: 0.7; }
.skill-icon {
  width: 40px; height: 40px; border-radius: 10px;
  display: grid; place-items: center; margin-bottom: 18px;
  color: var(--accent);
  background: var(--accent-dim);
}
.skill-card h3 { font-size: 0.98rem; font-weight: 650; margin-bottom: 13px; letter-spacing: 0.005em; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chips span {
  font-family: var(--mono); font-size: 0.71rem;
  color: var(--text-faint);
  background: rgba(255, 255, 255, 0.04);
  padding: 3.5px 10px; border-radius: 6px;
  transition: color 0.25s, background 0.25s;
}
.skill-card:hover .chips span { color: var(--text-soft); }
.skill-card:hover .chips span:hover { color: var(--accent); background: var(--accent-dim); }

/* timeline */
.timeline { position: relative; padding-left: 30px; }
.timeline::before {
  content: ""; position: absolute; left: 4.5px; top: 10px; bottom: 10px; width: 1px;
  background: linear-gradient(180deg, var(--accent-line), rgba(255, 255, 255, 0.08) 60%, transparent);
}
.tl-item { position: relative; margin-bottom: 20px; }
.tl-item:last-child { margin-bottom: 0; }
.tl-marker {
  position: absolute; left: -30px; top: 32px;
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}
.tl-item:first-child .tl-marker { box-shadow: 0 0 0 0 rgba(94, 234, 212, 0.4); animation: pulse 2.4s infinite; }
.tl-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 30px;
  transition: border-color 0.3s, background 0.3s, transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}
.tl-card:hover {
  border-color: rgba(94, 234, 212, 0.26);
  background: var(--surface-2);
  transform: translateX(4px);
}
.tl-head { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; flex-wrap: wrap; }
.tl-head h3 { font-family: var(--serif); font-size: 1.28rem; font-weight: 560; letter-spacing: -0.01em; }
.tl-period {
  font-family: var(--mono); font-size: 0.72rem; color: var(--text-soft);
  letter-spacing: 0.04em;
  border: 1px solid var(--border);
  padding: 4px 12px; border-radius: 999px; white-space: nowrap;
}
.tl-org { color: var(--accent); font-weight: 500; font-size: 0.9rem; margin: 7px 0 3px; }
.tl-client { color: var(--text-faint); font-weight: 400; }
.tl-desc { color: var(--text-soft); font-size: 0.93rem; margin-bottom: 15px; }
.tl-card ul { list-style: none; display: flex; flex-direction: column; gap: 9px; }
.tl-card li { color: var(--text-soft); font-size: 0.91rem; padding-left: 18px; position: relative; }
.tl-card li::before {
  content: ""; position: absolute; left: 0; top: 0.62em;
  width: 5px; height: 1px; background: var(--accent);
}
.tl-card li strong { color: var(--text); font-weight: 600; }

/* education */
.edu-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.edu-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px;
  overflow: hidden;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1), border-color 0.3s, background 0.3s;
}
.edu-card:hover { transform: translateY(-4px); border-color: rgba(94, 234, 212, 0.28); background: var(--surface-2); }
.edu-year {
  font-family: var(--mono); font-size: 0.72rem; color: var(--accent);
  letter-spacing: 0.06em;
  background: var(--accent-dim);
  padding: 3px 11px; border-radius: 999px; display: inline-block; margin-bottom: 16px;
}
.edu-card h3 { font-size: 1.06rem; font-weight: 650; margin-bottom: 6px; }
.edu-card p { color: var(--text-soft); font-size: 0.92rem; }

/* contact */
.contact { text-align: center; padding-bottom: 90px; }
.contact .section-title { margin-bottom: 18px; }
.contact-desc { color: var(--text-soft); max-width: 460px; margin: 0 auto 48px; font-size: 0.98rem; }
.contact-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; text-align: left; }
.contact-cards .contact-card:last-child { grid-column: 1 / -1; }
.contact-card {
  display: flex; align-items: center; gap: 16px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px 24px;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1), border-color 0.3s, background 0.3s;
}
.contact-card:hover {
  transform: translateY(-3px);
  border-color: rgba(94, 234, 212, 0.3);
  background: var(--surface-2);
}
.contact-card:hover .contact-value { color: var(--accent); }
.contact-icon {
  width: 42px; height: 42px; border-radius: 50%; flex-shrink: 0;
  display: grid; place-items: center; color: var(--accent);
  background: var(--accent-dim);
}
.contact-label { display: block; font-family: var(--mono); font-size: 0.66rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--text-faint); }
.contact-value { font-weight: 500; font-size: 0.95rem; transition: color 0.25s; }

/* footer */
.footer { border-top: 1px solid var(--border); padding: 28px 0; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
.footer p { color: var(--text-faint); font-size: 0.82rem; }
.back-top { color: var(--text-soft); font-size: 0.82rem; transition: color 0.2s; }
.back-top:hover { color: var(--accent); }

/* copy email button */
.copy-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px; border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: transparent; color: var(--text-soft);
  font-weight: 600; font-size: 0.9rem; letter-spacing: 0.01em;
  cursor: pointer;
  transition: transform 0.2s, border-color 0.2s, color 0.2s, background 0.2s;
}
.copy-btn:hover { border-color: rgba(255, 255, 255, 0.32); color: var(--text); background: var(--surface-2); transform: translateY(-2px); }
.copy-btn .icon-check { display: none; }
.copy-btn.copied { border-color: rgba(52, 211, 153, 0.5); color: var(--good); background: rgba(52, 211, 153, 0.07); }
.copy-btn.copied .icon-copy { display: none; }
.copy-btn.copied .icon-check { display: block; }

/* reveal animation */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.8s cubic-bezier(0.22, 1, 0.36, 1), transform 0.8s cubic-bezier(0.22, 1, 0.36, 1); }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ============ Responsive ============ */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero-card { max-width: 560px; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-cards { grid-template-columns: 1fr; }
  .edu-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .nav-links { display: none; }
  .menu-toggle { display: flex; }
  .section { padding: 78px 0; }
  .skills-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 0; }
  .stat { padding-right: 22px; }
  .stat + .stat { padding-left: 22px; }
  .stat-num { font-size: 2rem; }
  .tl-card { padding: 22px 20px; }
  .timeline { padding-left: 24px; }
  .tl-marker { left: -24px; }
  .tl-head h3 { font-size: 1.15rem; }
  .hero-cta .copy-label { display: none; }
  .copy-btn { padding: 12px 16px; }
}