/* =========================================================
   Ian Chen (陳葵懋) — Professional Profile
   Dark Tech Theme
   ========================================================= */

:root {
  --bg:            #070b16;
  --bg-2:          #0b1120;
  --surface:       rgba(255, 255, 255, 0.04);
  --surface-2:     rgba(255, 255, 255, 0.06);
  --border:        rgba(255, 255, 255, 0.10);
  --border-strong: rgba(255, 255, 255, 0.18);
  --text:          #e6ecf7;
  --text-soft:     #aab4c8;
  --text-dim:      #76819a;
  --accent:        #3b82f6;
  --accent-2:      #8b5cf6;
  --accent-3:      #06b6d4;
  --grad: linear-gradient(120deg, #06b6d4 0%, #3b82f6 45%, #8b5cf6 100%);
  --grad-soft: linear-gradient(120deg, rgba(6,182,212,.16), rgba(139,92,246,.16));
  --shadow: 0 18px 50px -20px rgba(0, 0, 0, 0.7);
  --radius: 18px;
  --maxw: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Inter", "Noto Sans TC", system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ---- Background glows ---- */
body::before,
body::after {
  content: "";
  position: fixed;
  z-index: -2;
  border-radius: 50%;
  filter: blur(110px);
  opacity: 0.5;
  pointer-events: none;
}
body::before {
  width: 620px; height: 620px;
  top: -220px; left: -160px;
  background: radial-gradient(circle, rgba(59,130,246,.55), transparent 65%);
}
body::after {
  width: 560px; height: 560px;
  top: 30%; right: -180px;
  background: radial-gradient(circle, rgba(139,92,246,.45), transparent 65%);
}

/* Language visibility toggle */
body.lang-en [lang="zh"] { display: none !important; }
body.lang-zh [lang="en"] { display: none !important; }

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

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* =========================================================
   Navbar
   ========================================================= */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(7, 11, 22, 0.72);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 16px;
}
.brand {
  font-weight: 800;
  letter-spacing: .5px;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand .dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--grad);
  box-shadow: 0 0 14px 2px rgba(59,130,246,.7);
}
.nav-links {
  display: flex;
  gap: 26px;
  align-items: center;
  font-size: .92rem;
  color: var(--text-soft);
}
.nav-links a { transition: color .2s; }
.nav-links a:hover { color: var(--text); }

.lang-toggle {
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  border-radius: 999px;
  padding: 7px 16px;
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  white-space: nowrap;
}
.lang-toggle:hover { background: var(--surface-2); border-color: var(--accent); }

/* =========================================================
   Hero
   ========================================================= */
.hero {
  padding: 92px 0 64px;
  position: relative;
}
.hero-grid {
  display: block;
  max-width: 820px;
}
.eyebrow {
  display: inline-block;
  font-size: .8rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent-3);
  font-weight: 700;
  margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.7rem);
  line-height: 1.1;
  margin: 0 0 6px;
  font-weight: 800;
  letter-spacing: -.5px;
}
.hero h1 .en-name {
  display: block;
  font-size: .5em;
  font-weight: 600;
  color: var(--text-soft);
  letter-spacing: 1px;
  margin-top: 8px;
}
.hero .role {
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
  color: var(--text);
  font-weight: 600;
  margin: 18px 0 8px;
}
.hero .role .grad-text { font-weight: 800; }
.hero .tagline {
  color: var(--text-soft);
  max-width: 600px;
  font-size: 1.02rem;
  margin: 14px 0 28px;
}

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.badges { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 30px; }
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: .85rem;
  font-weight: 600;
  background: var(--grad-soft);
  border: 1px solid var(--border-strong);
}
.badge svg { width: 16px; height: 16px; }

.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 12px 24px;
  border-radius: 12px;
  font-weight: 700;
  font-size: .95rem;
  cursor: pointer;
  transition: transform .15s, box-shadow .2s, background .2s;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 12px 30px -10px rgba(59,130,246,.7);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 36px -10px rgba(59,130,246,.85); }
.btn-ghost {
  background: var(--surface);
  border-color: var(--border-strong);
  color: var(--text);
}
.btn-ghost:hover { background: var(--surface-2); transform: translateY(-2px); }

/* Hero portrait / monogram */
.hero-card {
  position: relative;
  aspect-ratio: 1 / 1;
  border-radius: 28px;
  background: var(--grad-soft);
  border: 1px solid var(--border-strong);
  display: grid;
  place-items: center;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.hero-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 20%, rgba(6,182,212,.35), transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(139,92,246,.35), transparent 50%);
}
.monogram {
  position: relative;
  z-index: 1;
  font-size: clamp(4rem, 12vw, 7rem);
  font-weight: 800;
  letter-spacing: -2px;
  background: linear-gradient(135deg, #fff, #c7d6ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 40px rgba(120,160,255,.4);
}

/* =========================================================
   Sections
   ========================================================= */
section { padding: 72px 0; position: relative; }
.section-head { margin-bottom: 40px; }
.section-kicker {
  font-size: .78rem;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--accent-3);
  font-weight: 700;
}
.section-title {
  font-size: clamp(1.6rem, 3.4vw, 2.3rem);
  font-weight: 800;
  margin: 8px 0 0;
  letter-spacing: -.4px;
}
.section-sub { color: var(--text-soft); margin-top: 10px; max-width: 720px; }

/* ---- Stats ---- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 20px;
  text-align: center;
  transition: transform .2s, border-color .2s, background .2s;
}
.stat:hover { transform: translateY(-4px); border-color: var(--border-strong); background: var(--surface-2); }
.stat .num {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 800;
  line-height: 1;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat .label { color: var(--text-soft); font-size: .9rem; margin-top: 10px; }

/* ---- About ---- */
.about-text p { color: var(--text-soft); font-size: 1.05rem; }
.about-text p strong { color: var(--text); }

/* ---- Cards grid ---- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  transition: transform .2s, border-color .2s, background .2s;
}
.card:hover { transform: translateY(-4px); border-color: var(--border-strong); background: var(--surface-2); }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }

/* ---- Expertise chips ---- */
.chips { display: flex; flex-wrap: wrap; gap: 12px; }
.chip {
  padding: 10px 18px;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: .95rem;
  font-weight: 600;
  color: var(--text);
  transition: all .2s;
}
.chip:hover { border-color: var(--accent); background: var(--grad-soft); transform: translateY(-2px); }

/* ---- Certifications ---- */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}
.cert {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: transform .2s, border-color .2s, background .2s;
}
.cert:hover { border-color: var(--accent); background: var(--grad-soft); transform: translateY(-3px); }
.cert .code {
  font-weight: 800;
  font-size: 1.02rem;
  letter-spacing: .3px;
}
.cert .cn { color: var(--text-dim); font-size: .82rem; }

.skill-group { margin-bottom: 26px; }
.skill-group h4 {
  font-size: .95rem;
  color: var(--accent-3);
  margin: 0 0 14px;
  font-weight: 700;
  letter-spacing: .5px;
}

/* ---- Lists (speaking / training) ---- */
.feature-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  color: var(--text-soft);
}
.feature-list li::before {
  content: "";
  flex: 0 0 auto;
  width: 9px; height: 9px;
  margin-top: 9px;
  border-radius: 3px;
  background: var(--grad);
  box-shadow: 0 0 10px rgba(59,130,246,.6);
}
.feature-list li strong { color: var(--text); font-weight: 700; }

/* ---- 2026 speaking appearances ---- */
.speaking-year {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 22px;
  padding: 24px 28px;
  border: 1px solid rgba(59, 130, 246, .28);
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(6,182,212,.08), rgba(59,130,246,.12) 55%, rgba(139,92,246,.08));
}
.year-label {
  color: var(--accent-3);
  font-size: .76rem;
  font-weight: 800;
  letter-spacing: 1.8px;
  text-transform: uppercase;
}
.speaking-year h3 { margin: 6px 0 4px; font-size: clamp(1.35rem, 2.8vw, 1.8rem); }
.speaking-year p { margin: 0; color: var(--text-soft); max-width: 720px; }
.year-total { flex: 0 0 auto; display: flex; align-items: baseline; gap: 8px; color: var(--text-soft); white-space: nowrap; }
.year-total strong { color: var(--text); font-size: 2.6rem; line-height: 1; }
.year-total span { font-size: .84rem; }

.event-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  margin-bottom: 32px;
}
.event-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(155deg, rgba(255,255,255,.05), rgba(255,255,255,.025));
  box-shadow: var(--shadow);
  transition: transform .2s, border-color .2s, background .2s;
}
.event-card:hover { transform: translateY(-4px); border-color: var(--border-strong); background: var(--surface-2); }
.event-card-featured {
  grid-column: 1 / -1;
  border-color: rgba(6, 182, 212, .3);
  background: linear-gradient(140deg, rgba(6,182,212,.1), rgba(59,130,246,.09) 48%, rgba(139,92,246,.08));
}
.event-top { display: flex; justify-content: space-between; align-items: center; gap: 14px; margin-bottom: 20px; }
.event-top time { color: var(--text-soft); font-size: .82rem; font-weight: 700; letter-spacing: .35px; }
.event-status {
  flex: 0 0 auto;
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-dim);
  background: rgba(255,255,255,.03);
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .5px;
  text-transform: uppercase;
}
.event-status.upcoming { color: #7dd3fc; border-color: rgba(6,182,212,.35); background: rgba(6,182,212,.1); }
.event-org { color: var(--accent-3); font-size: .78rem; font-weight: 800; letter-spacing: 1.2px; text-transform: uppercase; }
.event-card h3 { margin: 8px 0 10px; font-size: clamp(1.12rem, 2.1vw, 1.4rem); line-height: 1.4; }
.event-card > p { margin: 0 0 22px; color: var(--text-soft); }
.event-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  margin-top: auto;
  color: #7dd3fc;
  font-size: .88rem;
  font-weight: 700;
  transition: gap .2s, color .2s;
}
.event-link:hover { gap: 12px; color: #bae6fd; }
.session-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 4px; }
.session-list a {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 5px 14px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(7,11,22,.32);
  transition: transform .2s, border-color .2s, background .2s;
}
.session-list a:hover { transform: translateY(-2px); border-color: rgba(6,182,212,.45); background: rgba(6,182,212,.07); }
.session-type { grid-column: 1; color: var(--accent-3); font-size: .72rem; font-weight: 800; letter-spacing: 1px; text-transform: uppercase; }
.session-list strong { grid-column: 1; color: var(--text); line-height: 1.45; }
.event-arrow { grid-column: 2; grid-row: 1 / 3; align-self: center; color: var(--accent-3); font-size: 1.15rem; }
.event-link:focus-visible,
.session-list a:focus-visible { outline: 2px solid #7dd3fc; outline-offset: 4px; }

/* ---- Project highlight ---- */
.project {
  background: linear-gradient(160deg, rgba(255,255,255,.05), rgba(255,255,255,.02));
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 32px;
  position: relative;
  overflow: hidden;
}
.project::before {
  content: "";
  position: absolute;
  top: -40px; right: -40px;
  width: 160px; height: 160px;
  background: var(--grad-soft);
  filter: blur(30px);
  border-radius: 50%;
}
.project .tag {
  display: inline-block;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--grad-soft);
  border: 1px solid var(--border-strong);
  margin-bottom: 16px;
}
.project h3 { font-size: 1.5rem; margin: 0 0 6px; font-weight: 800; }
.project .yr { color: var(--accent-3); font-weight: 700; font-size: .9rem; }
.project p { color: var(--text-soft); position: relative; }
.project .metric {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  margin-top: 8px;
  font-weight: 800;
}
.project .metric b {
  font-size: 1.6rem;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* ---- Media coverage ---- */
.media-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.media-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  transition: all .2s;
}
.media-item:hover { border-color: var(--accent); background: var(--surface-2); transform: translateX(4px); }
.media-item .src { font-weight: 700; color: var(--text); }
.media-item .desc { color: var(--text-dim); font-size: .85rem; margin-top: 2px; }
.media-item .arrow { color: var(--accent-3); flex: 0 0 auto; }

/* ---- Books ---- */
.book {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  gap: 18px;
  align-items: flex-start;
  transition: all .2s;
}
.book:hover { transform: translateY(-4px); border-color: var(--border-strong); background: var(--surface-2); }
.book .spine {
  flex: 0 0 auto;
  width: 48px; height: 64px;
  border-radius: 6px;
  background: var(--grad);
  display: grid; place-items: center;
  font-weight: 800; color: #fff; font-size: 1.4rem;
  box-shadow: var(--shadow);
}
.book h4 { margin: 0 0 6px; font-size: 1.05rem; font-weight: 700; line-height: 1.4; }
.book .meta { color: var(--text-dim); font-size: .85rem; }

/* ---- Education ---- */
.edu {
  display: flex;
  gap: 20px;
  align-items: center;
}
.edu .ico {
  flex: 0 0 auto;
  width: 56px; height: 56px;
  border-radius: 14px;
  background: var(--grad-soft);
  border: 1px solid var(--border-strong);
  display: grid; place-items: center;
}
.edu .ico svg { width: 26px; height: 26px; color: var(--accent-3); }
.edu h4 { margin: 0; font-size: 1.15rem; }
.edu .meta { color: var(--text-soft); }

/* ---- Contact ---- */
.contact-card {
  text-align: center;
  background: var(--grad-soft);
  border: 1px solid var(--border-strong);
  border-radius: 24px;
  padding: 48px 28px;
}
.contact-card h2 { font-size: clamp(1.6rem, 3.5vw, 2.2rem); margin: 0 0 12px; font-weight: 800; }
.contact-card p { color: var(--text-soft); max-width: 520px; margin: 0 auto 28px; }
.contact-actions { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; }

/* ---- Footer ---- */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  color: var(--text-dim);
  font-size: .88rem;
}
footer .brand { justify-content: center; margin-bottom: 10px; }

/* =========================================================
   Reveal animation
   ========================================================= */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.in { opacity: 1; transform: none; }

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero-card { max-width: 320px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .grid-2, .grid-3, .media-grid, .event-grid { grid-template-columns: 1fr; }
  .event-card-featured { grid-column: auto; }
  .session-list { grid-template-columns: 1fr; }
  .nav-links { display: none; }
}
@media (max-width: 480px) {
  .stats { grid-template-columns: 1fr 1fr; }
  .hero { padding-top: 64px; }
  section { padding: 56px 0; }
  .speaking-year { align-items: flex-start; padding: 22px; }
  .year-total { display: none; }
  .event-card { padding: 22px; }
  .event-top { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto; }
  .reveal { transition: none; opacity: 1; transform: none; }
}