:root {
  --bg: #fafafa;
  --bg-2: #f3f4f6;
  --surface: #ffffff;
  --border: #e5e7eb;
  --border-light: #f1f2f4;
  --text: #0f0f0f;
  --text-2: #374151;
  --text-muted: #6b7280;
  --accent: #6d28d9;
  --accent-light: #ede9fe;
  --accent-2: #2563eb;
  --accent-3: #059669;
  --accent-orange: #d97706;
  --glow: rgba(109, 40, 217, 0.15);
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 4px 16px rgba(0,0,0,.05);
  --shadow-lg: 0 4px 6px rgba(0,0,0,.04), 0 12px 48px rgba(0,0,0,.1);
  --transition: 0.35s cubic-bezier(0.4,0,0.2,1);
  --nav-h: 64px;
}

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

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

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  line-height: 1.6;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
em { font-style: normal; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ── NAV ── */
#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: rgba(250,250,250,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  transition: box-shadow var(--transition);
}

#nav.scrolled {
  box-shadow: 0 2px 20px rgba(0,0,0,.08);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-logo {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}

.nav-logo .dot { color: var(--accent); }

.nav-links {
  display: flex;
  list-style: none;
  gap: 0.25rem;
  margin-left: auto;
}

.nav-links a {
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: background var(--transition), color var(--transition);
}

.nav-links a:hover {
  background: var(--bg-2);
  color: var(--text);
}

.nav-cta {
  padding: 0.45rem 1.1rem;
  background: var(--text);
  color: var(--surface);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  transition: opacity var(--transition), transform var(--transition);
}

.nav-cta:hover { opacity: 0.85; transform: translateY(-1px); }

/* ── HERO ── */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 4rem) 2rem 4rem;
  max-width: 1100px;
  margin: 0 auto;
  gap: 4rem;
  position: relative;
}

.hero-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.hero-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.18;
  animation: blobFloat 14s ease-in-out infinite alternate;
}

.blob-1 { width: 600px; height: 600px; background: radial-gradient(circle, #7c3aed, transparent 70%); top: -100px; left: -150px; }
.blob-2 { width: 500px; height: 500px; background: radial-gradient(circle, #2563eb, transparent 70%); bottom: 0; right: -100px; animation-delay: -5s; animation-duration: 18s; }
.blob-3 { width: 350px; height: 350px; background: radial-gradient(circle, #059669, transparent 70%); top: 40%; left: 40%; animation-delay: -9s; animation-duration: 20s; opacity: 0.1; }

@keyframes blobFloat {
  0% { transform: translate(0,0) scale(1); }
  100% { transform: translate(25px, 20px) scale(1.07); }
}

.grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.4;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black 40%, transparent 100%);
}

.hero-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 0.4rem 1rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-2);
  box-shadow: var(--shadow);
  width: fit-content;
}

.badge-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 6px #22c55e;
  animation: pulse 2s ease infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 6px #22c55e; }
  50% { box-shadow: 0 0 14px #22c55e; }
}

.hero-title {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  font-size: clamp(2.4rem, 5.5vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.hero-title em {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.grad-text {
  background: linear-gradient(135deg, var(--accent), var(--accent-2), var(--accent-3));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 480px;
  line-height: 1.75;
}

.inline-link {
  color: var(--accent);
  font-weight: 500;
  border-bottom: 1px solid var(--accent-light);
  transition: border-color var(--transition);
}

.inline-link:hover { border-color: var(--accent); }

.hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 16px var(--glow);
}

.btn-primary:hover {
  background: #5b21b6;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--glow);
}

.btn-outline {
  background: var(--surface);
  color: var(--text);
  border: 1.5px solid var(--border);
  box-shadow: var(--shadow);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.hero-scroll {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-muted);
  font-size: 0.82rem;
}

.scroll-indicator {
  width: 26px; height: 40px;
  border: 2px solid var(--border);
  border-radius: 20px;
  display: flex;
  justify-content: center;
  padding-top: 6px;
}

.scroll-indicator span {
  width: 4px; height: 8px;
  background: var(--accent);
  border-radius: 2px;
  animation: scrollDown 1.8s ease infinite;
}

@keyframes scrollDown {
  0% { opacity: 1; transform: translateY(0); }
  80% { opacity: 0; transform: translateY(12px); }
  100% { opacity: 0; transform: translateY(0); }
}

/* Hero visual */
.hero-visual {
  flex: 0 0 420px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
}

.photo-frame {
  position: relative;
  width: 300px;
  height: 300px;
}

.photo-glow {
  position: absolute;
  inset: -20px;
  background: radial-gradient(circle, var(--glow) 0%, transparent 70%);
  border-radius: 50%;
  animation: glowPulse 3s ease-in-out infinite;
}

@keyframes glowPulse {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.05); }
}

.hero-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid var(--surface);
  box-shadow: var(--shadow-lg);
  position: relative;
  z-index: 2;
}

.photo-ring {
  position: absolute;
  border-radius: 50%;
  border: 1.5px solid transparent;
  inset: 0;
  animation: ringRotate linear infinite;
}

.ring-1 {
  inset: -16px;
  border-color: rgba(109,40,217,0.3) transparent transparent transparent;
  animation-duration: 8s;
}

.ring-2 {
  inset: -28px;
  border-color: transparent rgba(37,99,235,0.2) transparent transparent;
  animation-duration: 12s;
  animation-direction: reverse;
}

.ring-3 {
  inset: -42px;
  border-color: rgba(5,150,105,0.15) transparent transparent transparent;
  animation-duration: 18s;
}

@keyframes ringRotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.float-card {
  position: absolute;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  box-shadow: var(--shadow-lg);
  white-space: nowrap;
  animation: floatBob 4s ease-in-out infinite;
}

.card-top { top: -10px; right: -60px; animation-delay: 0s; }
.card-bottom { bottom: 10px; left: -70px; animation-delay: -2s; }

@keyframes floatBob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.fc-icon { font-size: 1.6rem; }
.fc-title { font-size: 0.85rem; font-weight: 600; }
.fc-sub { font-size: 0.75rem; color: var(--text-muted); }

/* ── SECTIONS ── */
section:not(#hero) {
  padding: 6rem 0;
}

section:nth-child(even) {
  background: var(--bg-2);
}

.section-label {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  background: var(--accent-light);
  padding: 0.3rem 0.9rem;
  border-radius: 50px;
  margin-bottom: 1rem;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.section-title em {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-sub {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 520px;
  margin-bottom: 3rem;
}

/* ── ABOUT ── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
  margin-top: 2rem;
}

.about-text p {
  color: var(--text-2);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.about-stats {
  display: flex;
  gap: 2rem;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.stat-num {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.4;
  margin-top: 0.2rem;
}

.about-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.about-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.about-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.about-card.card-purple { border-top: 3px solid var(--accent); }
.about-card.card-blue { border-top: 3px solid var(--accent-2); }
.about-card.card-orange { border-top: 3px solid var(--accent-orange); }
.about-card.card-green { border-top: 3px solid var(--accent-3); }

.ac-icon { font-size: 1.5rem; margin-bottom: 0.75rem; }

.about-card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.about-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ── SKILLS ── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.skill-group {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.skill-group:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.sg-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-light);
}

.sg-icon { font-size: 1.1rem; }

.skill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.skill-tag {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.3rem 0.65rem;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-2);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  cursor: default;
}

.skill-tag:hover {
  background: var(--accent-light);
  color: var(--accent);
  border-color: var(--accent);
}

/* ── PROJECTS ── */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 2rem;
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

.project-featured {
  grid-column: span 2;
  background: linear-gradient(135deg, #faf5ff 0%, #eff6ff 100%);
  border-color: var(--accent);
}

.pc-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.25rem;
}

.pc-logo {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: white;
  border: 1px solid var(--border);
  flex-shrink: 0;
}

.pc-logo img { width: 100%; height: 100%; object-fit: contain; padding: 6px; }
.logo-fallback { font-weight: 700; font-size: 0.9rem; color: var(--accent); }
.pc-icon { font-size: 2rem; }

.pc-badge {
  margin-left: auto;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.25rem 0.7rem;
  border-radius: 50px;
  background: var(--accent-light);
  color: var(--accent);
  letter-spacing: 0.03em;
}

.pc-badge-school { background: #dbeafe; color: var(--accent-2); }
.pc-badge-ai { background: #d1fae5; color: var(--accent-3); }

.project-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.project-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
  flex: 1;
}

.pc-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.pc-tags span {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.2rem 0.6rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
}

.pc-link {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: gap var(--transition);
}

.pc-link:hover { gap: 0.5rem; }

/* ── EDUCATION ── */
#education .container { max-width: 720px; }

.edu-card {
  display: flex;
  gap: 2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-top: 2rem;
  box-shadow: var(--shadow);
}

.edu-left {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.edu-icon { font-size: 2rem; }

.edu-line {
  flex: 1;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  min-height: 40px;
}

.edu-content { flex: 1; }

.edu-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-light);
  padding: 0.2rem 0.75rem;
  border-radius: 50px;
  margin-bottom: 0.75rem;
}

.edu-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.edu-school {
  color: var(--accent-2);
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

.edu-content p {
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.7;
  margin-bottom: 1rem;
}

.edu-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.edu-tags span {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.2rem 0.6rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
}

/* ── CONTACT ── */
.contact-box {
  background: linear-gradient(135deg, #faf5ff 0%, #eff6ff 50%, #ecfdf5 100%);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 4rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.contact-box p {
  color: var(--text-muted);
  max-width: 440px;
  font-size: 1.05rem;
}

.contact-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1.4rem;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all var(--transition);
  box-shadow: var(--shadow);
}

.contact-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.cl-icon {
  width: 20px; height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.cl-icon svg { width: 18px; height: 18px; }

/* ── FOOTER ── */
footer {
  background: var(--text);
  color: rgba(255,255,255,0.5);
  padding: 2rem 0;
  text-align: center;
  font-size: 0.85rem;
}

footer strong { color: rgba(255,255,255,0.8); }

/* ── REVEAL ANIMATIONS ── */
.reveal, .reveal-delay-1, .reveal-delay-2, .reveal-delay-3 {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal-delay-1 { transition-delay: 0.15s; }
.reveal-delay-2 { transition-delay: 0.3s; }
.reveal-delay-3 { transition-delay: 0.45s; }

.revealed {
  opacity: 1 !important;
  transform: translateY(0) !important;
}

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  #hero { flex-direction: column; padding-top: calc(var(--nav-h) + 2rem); text-align: center; }
  .hero-sub { max-width: 100%; }
  .hero-actions { justify-content: center; }
  .hero-scroll { justify-content: center; }
  .hero-visual { flex: none; width: 100%; max-width: 320px; }
  .card-top { right: -20px; }
  .card-bottom { left: -30px; }
  .about-grid { grid-template-columns: 1fr; gap: 2rem; }
  .skills-grid { grid-template-columns: 1fr 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .project-featured { grid-column: span 1; }
  .contact-box { padding: 2.5rem 1.5rem; }
}

@media (max-width: 600px) {
  .nav-links { display: none; }
  .skills-grid { grid-template-columns: 1fr; }
  .about-cards { grid-template-columns: 1fr; }
  .about-stats { flex-direction: column; gap: 1rem; }
}