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

:root {
  --bg: #0a0e1a;
  --bg2: #0d1220;
  --surface: #151e30;
  --border: #1e2d45;
  --text: #e8edf5;
  --text-muted: #6b7c93;
  --text-dim: #3a4a60;
  --accent: #00e5ff;
  --accent2: #4a9eff;
  --accent3: #a855f7;
  --warm: #ff6b35;
  --green: #22c55e;
  --nav-h: 64px;
  --max: 1100px;
  --r: 12px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  font-size: 15px; line-height: 1.65;
  color: var(--text); background: var(--bg);
  overflow-x: hidden;
}

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

/* ===== NAV ===== */
#nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  height: var(--nav-h);
  background: rgba(10,14,26,0.85);
  backdrop-filter: blur(16px) saturate(1.4);
  border-bottom: 1px solid rgba(255,255,255,0.04);
  transition: background 0.3s;
}
.nav-inner {
  max-width: var(--max); margin: 0 auto; padding: 0 40px;
  height: 100%; display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  font-family: 'Syne', sans-serif; font-weight: 800; font-size: 20px;
  color: var(--accent); letter-spacing: -0.02em;
}
nav ul { list-style: none; display: flex; gap: 32px; align-items: center; }
nav ul li a {
  font-size: 13.5px; font-weight: 500; color: var(--text-muted);
  transition: color 0.2s; letter-spacing: 0.01em;
}
nav ul li a:hover { color: var(--text); }
.nav-cta {
  background: rgba(0,229,255,0.1) !important;
  border: 1px solid rgba(0,229,255,0.25) !important;
  color: var(--accent) !important;
  padding: 7px 18px !important;
  border-radius: 6px !important;
  transition: background 0.2s !important;
}
.nav-cta:hover { background: rgba(0,229,255,0.2) !important; }

/* ===== HERO ===== */
#hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center;
  overflow: hidden;
  padding: calc(var(--nav-h) + 40px) 40px 80px;
}
#bg-canvas {
  position: absolute; inset: 0; width: 100%; height: 100%;
  pointer-events: none; opacity: 0.6;
}
.hero-content {
  position: relative; z-index: 2;
  max-width: var(--max); margin: 0 auto; width: 100%;
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 60px;
  align-items: center;
}
.hero-eyebrow {
  font-size: 12px; font-weight: 500; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 16px;
}
.hero-name {
  font-family: 'Syne', sans-serif; font-weight: 800;
  font-size: clamp(64px, 10vw, 110px);
  line-height: 0.95; letter-spacing: -0.03em;
  color: var(--text); margin-bottom: 28px;
}
.hero-tags {
  display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 28px;
}
.hero-tags span {
  font-size: 12px; font-weight: 500; letter-spacing: 0.03em;
  color: var(--text-muted); border: 1px solid var(--border);
  border-radius: 4px; padding: 4px 12px;
  background: rgba(255,255,255,0.02);
  transition: border-color 0.2s, color 0.2s;
}
.hero-tags span:hover { border-color: var(--accent); color: var(--accent); }
.hero-bio {
  font-size: 16px; color: var(--text-muted); max-width: 560px;
  line-height: 1.75; margin-bottom: 36px;
}
.hero-bio em { color: var(--accent); font-style: normal; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn-primary {
  background: var(--accent); color: var(--bg);
  font-size: 14px; font-weight: 600; padding: 12px 28px;
  border-radius: 8px; transition: opacity 0.2s, transform 0.2s;
}
.btn-primary:hover { opacity: 0.88; transform: translateY(-1px); }
.btn-ghost {
  background: transparent; color: var(--text-muted);
  font-size: 14px; font-weight: 500; padding: 12px 24px;
  border: 1px solid var(--border); border-radius: 8px;
  transition: border-color 0.2s, color 0.2s;
}
.btn-ghost:hover { border-color: var(--text-muted); color: var(--text); }

/* Photo */
.hero-right { display: flex; justify-content: center; align-items: center; }
.hero-photo-wrap {
  position: relative;
  width: 280px; height: 280px;
}
.hero-photo-wrap::before {
  content: '';
  position: absolute; inset: -8px;
  border-radius: 50%;
  background: conic-gradient(
    from 0deg,
    var(--accent) 0%, var(--accent3) 35%, var(--warm) 65%, var(--accent) 100%
  );
  opacity: 0.35;
  filter: blur(14px);
  animation: photoglow 6s ease-in-out infinite alternate;
}
@keyframes photoglow {
  from { opacity: 0.25; filter: blur(14px); }
  to   { opacity: 0.5;  filter: blur(20px); }
}
.hero-photo {
  position: relative; z-index: 1;
  width: 280px; height: 280px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid rgba(255,255,255,0.08);
  box-shadow: 0 0 0 1px rgba(0,229,255,0.15), 0 16px 48px rgba(0,0,0,0.5);
}

.hero-scroll-hint {
  position: absolute; bottom: 36px; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  opacity: 0.3;
}
.hero-scroll-hint span { font-size: 10px; letter-spacing: 0.15em; text-transform: uppercase; }
.scroll-line {
  width: 1px; height: 40px; background: var(--text);
  animation: scrollpulse 2s ease-in-out infinite;
}
@keyframes scrollpulse {
  0%,100% { transform: scaleY(1); opacity: 1; }
  50% { transform: scaleY(0.5); opacity: 0.4; }
}

/* ===== SECTIONS ===== */
section:not(#hero) { padding: 100px 40px; }
#papers { background: var(--bg); }
#education { background: var(--bg2); }
#awards { background: var(--bg); }
#contact { background: var(--bg2); }

.section-header { margin-bottom: 64px; }
.section-label {
  font-size: 11px; font-weight: 600; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--accent); display: block; margin-bottom: 8px;
}
.section-header h2 {
  font-family: 'Syne', sans-serif; font-weight: 800;
  font-size: clamp(36px, 5vw, 52px); letter-spacing: -0.02em;
  color: var(--text);
}

/* ===== PAPER CARDS ===== */
.paper-card {
  max-width: var(--max); margin: 0 auto 48px;
  display: grid; grid-template-columns: 420px 1fr;
  border: 1px solid var(--border); border-radius: var(--r);
  overflow: hidden; background: var(--surface);
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
}
.paper-card:hover {
  border-color: rgba(0,229,255,0.25);
  transform: translateY(-4px);
  box-shadow: 0 24px 60px rgba(0,0,0,0.4), 0 0 0 1px rgba(0,229,255,0.08);
}
.paper-card-flip { grid-template-columns: 1fr 420px; }
.paper-card-flip .paper-visual { order: 2; }
.paper-card-flip .paper-body { order: 1; }

.paper-visual { position: relative; overflow: hidden; background: #080d1a; }
.paper-svg { width: 100%; height: 100%; display: block; }

.paper-body { padding: 36px 40px; display: flex; flex-direction: column; gap: 14px; }
.paper-meta { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }

.badge {
  font-size: 10px; font-weight: 700; letter-spacing: 0.08em;
  text-transform: uppercase; padding: 4px 10px; border-radius: 4px;
}
.badge-published { background: rgba(34,197,94,0.15); color: #22c55e; border: 1px solid rgba(34,197,94,0.3); }
.badge-submitted { background: rgba(251,191,36,0.12); color: #fbbf24; border: 1px solid rgba(251,191,36,0.25); }
.badge-prep { background: rgba(100,116,139,0.15); color: #94a3b8; border: 1px solid rgba(100,116,139,0.25); }

.venue { font-size: 12.5px; color: var(--text-muted); font-style: italic; }

.paper-title {
  font-family: 'Syne', sans-serif; font-weight: 700;
  font-size: 19px; line-height: 1.3; letter-spacing: -0.01em; color: var(--text);
}
.paper-authors { font-size: 13px; color: var(--text-muted); }
.paper-authors strong { color: var(--accent2); }
.paper-abstract { font-size: 13.5px; color: var(--text-muted); line-height: 1.7; }
.paper-abstract em { color: var(--text); font-style: italic; }
.paper-keywords { display: flex; flex-wrap: wrap; gap: 6px; }
.paper-keywords span {
  font-size: 11.5px; color: var(--text-dim);
  border: 1px solid var(--border); border-radius: 3px;
  padding: 2px 9px; background: rgba(255,255,255,0.02);
}
.paper-actions { margin-top: auto; padding-top: 8px; display: flex; gap: 10px; }
.paper-btn {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 13px; font-weight: 500; padding: 9px 20px; border-radius: 7px;
  background: rgba(0,229,255,0.1); color: var(--accent);
  border: 1px solid rgba(0,229,255,0.2);
  transition: background 0.2s, transform 0.15s;
}
.paper-btn:hover { background: rgba(0,229,255,0.2); transform: translateX(2px); }

/* ===== EDUCATION ===== */
.edu-timeline { max-width: 700px; margin: 0 auto; position: relative; }
.edu-timeline::before {
  content: ''; position: absolute; left: 100px; top: 0; bottom: 0;
  width: 1px; background: var(--border);
}
.edu-entry {
  display: grid; grid-template-columns: 100px 24px 1fr;
  gap: 0 20px; align-items: flex-start; margin-bottom: 40px;
}
.edu-year {
  font-size: 12px; color: var(--text-dim); font-weight: 500;
  text-align: right; padding-top: 4px;
}
.edu-line { width: 1px; position: relative; }
.edu-line::after {
  content: ''; position: absolute;
  top: 5px; left: 50%; transform: translateX(-50%);
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 12px var(--accent);
}
.edu-school {
  font-family: 'Syne', sans-serif; font-weight: 700; font-size: 16px;
  color: var(--text); margin-bottom: 3px;
}
.edu-degree { font-size: 14px; color: var(--text-muted); margin-bottom: 3px; }
.edu-details { font-size: 12px; color: var(--text-dim); }
.top5 {
  background: rgba(0,229,255,0.1); color: var(--accent);
  border: 1px solid rgba(0,229,255,0.2); border-radius: 3px;
  font-size: 10px; font-weight: 600; padding: 1px 7px; letter-spacing: 0.05em;
}

/* ===== AWARDS ===== */
.awards-grid {
  max-width: var(--max); margin: 0 auto 60px;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
}
.award-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; padding: 24px;
  transition: border-color 0.3s, transform 0.25s;
}
.award-card:hover { border-color: rgba(255,255,255,0.1); transform: translateY(-2px); }
.award-year {
  font-size: 11px; font-weight: 700; letter-spacing: 0.08em;
  color: var(--accent); text-transform: uppercase; margin-bottom: 8px; display: block;
}
.award-card p { font-size: 14px; color: var(--text-muted); line-height: 1.5; }

.service-row {
  max-width: var(--max); margin: 0 auto 40px;
  padding: 28px 32px; background: var(--surface);
  border: 1px solid var(--border); border-radius: 10px;
}
.service-row h3 {
  font-size: 13px; font-weight: 600; color: var(--text-muted);
  letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 14px;
}
.service-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.service-tags span {
  font-size: 12.5px; color: var(--text-muted); padding: 5px 14px;
  border: 1px solid var(--border); border-radius: 5px;
  background: rgba(255,255,255,0.02);
}
.skills-row {
  max-width: var(--max); margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
}
.skill-block {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; padding: 24px 28px;
}
.skill-block h4 {
  font-size: 12px; font-weight: 600; color: var(--text-muted);
  letter-spacing: 0.07em; text-transform: uppercase; margin-bottom: 12px;
}
.skill-pills { display: flex; flex-wrap: wrap; gap: 7px; }
.skill-pills span {
  font-size: 12.5px; color: var(--text-muted); padding: 4px 12px;
  border: 1px solid var(--border); border-radius: 4px;
}

/* ===== CONTACT ===== */
#contact { min-height: 50vh; display: flex; align-items: center; }
.contact-inner { max-width: 560px; margin: 0 auto; text-align: center; }
.contact-inner h2 {
  font-family: 'Syne', sans-serif; font-weight: 800; font-size: 48px;
  letter-spacing: -0.02em; margin-bottom: 16px;
}
.contact-inner p { font-size: 16px; color: var(--text-muted); margin-bottom: 36px; }
.contact-btn {
  display: inline-block; font-size: 16px; font-weight: 600;
  padding: 16px 40px; border-radius: 10px;
  background: var(--accent); color: var(--bg);
  transition: opacity 0.2s, transform 0.2s; margin-bottom: 32px;
}
.contact-btn:hover { opacity: 0.88; transform: translateY(-2px); }
.contact-meta {
  display: flex; justify-content: center; flex-wrap: wrap; gap: 20px;
  font-size: 13px; color: var(--text-dim);
}
.contact-meta span::before { content: '—  '; }

/* ===== FOOTER ===== */
footer {
  padding: 24px 40px; border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
  font-size: 12px; color: var(--text-dim);
}

/* ===== REVEAL ANIMATION ===== */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .hero-content { grid-template-columns: 1fr; gap: 36px; }
  .hero-right { order: -1; }
  .hero-photo-wrap, .hero-photo { width: 180px; height: 180px; }
  .paper-card, .paper-card-flip { grid-template-columns: 1fr; }
  .paper-card-flip .paper-visual { order: 1; }
  .paper-card-flip .paper-body { order: 2; }
  .paper-visual { height: 220px; }
  .awards-grid { grid-template-columns: 1fr 1fr; }
  .skills-row { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  section:not(#hero) { padding: 72px 24px; }
  #hero { padding-left: 24px; padding-right: 24px; }
  .nav-inner { padding: 0 24px; }
  nav ul { gap: 14px; }
  .awards-grid { grid-template-columns: 1fr; }
  .edu-timeline::before { left: 80px; }
  .edu-entry { grid-template-columns: 80px 20px 1fr; }
  footer { flex-direction: column; gap: 6px; text-align: center; }
}