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

html { scroll-behavior: smooth; }

body {
  font-family: 'DM Sans', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
  overflow-x: hidden;
}

/* ── THEME VARIABLES ───────────────────────────────────────── */
[data-theme="dark"] {
  --bg: #0a0a0f;
  --bg-alt: #0f0f18;
  --bg-card: #13131f;
  --bg-card-hover: #1a1a2e;
  --border: #1e1e30;
  --border-bright: #2e2e50;
  --text: #e8e8f0;
  --text-muted: #8888aa;
  --text-hint: #55556a;
  --accent: #7cffcb;
  --accent-dim: rgba(124, 255, 203, 0.12);
  --accent-glow: rgba(124, 255, 203, 0.25);
  --tag-bg: #1a1a2e;
  --tag-color: #8888bb;
  --code-bg: #0d0d1a;
  --nav-bg: rgba(10, 10, 15, 0.85);
}

[data-theme="light"] {
  --bg: #f5f5f7;
  --bg-alt: #ebebf0;
  --bg-card: #ffffff;
  --bg-card-hover: #f0f0f8;
  --border: #e0e0ea;
  --border-bright: #c8c8de;
  --text: #111118;
  --text-muted: #555570;
  --text-hint: #999ab0;
  --accent: #0066ff;
  --accent-dim: rgba(0, 102, 255, 0.08);
  --accent-glow: rgba(0, 102, 255, 0.2);
  --tag-bg: #ebebf5;
  --tag-color: #555580;
  --code-bg: #1a1a2e;
  --nav-bg: rgba(245, 245, 247, 0.85);
}

/* ── BASE ──────────────────────────────────────────────────── */
body { background: var(--bg); color: var(--text); }

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

h1, h2, h3 { font-family: 'Syne', sans-serif; line-height: 1.15; }

em { font-style: normal; color: var(--accent); }

/* ── NAV ───────────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 60px;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-logo {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text);
  letter-spacing: -0.02em;
}

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

.nav-links {
  display: flex;
  gap: 2rem;
  margin-left: auto;
}

.nav-links a {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-family: 'DM Mono', monospace;
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--accent); }

.theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  width: 36px; height: 36px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1rem;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.nav-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-burger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text-muted);
  border-radius: 2px;
  transition: all 0.2s;
}

.nav-mobile {
  display: none;
  flex-direction: column;
  padding: 1rem 2rem 1.5rem;
  gap: 1rem;
  border-top: 1px solid var(--border);
}

.nav-mobile a {
  font-family: 'DM Mono', monospace;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.nav-mobile.open { display: flex; }

/* ── HERO ──────────────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: 6rem 2rem 4rem;
}

.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.4;
  pointer-events: none;
}

.hero-glow {
  position: absolute;
  top: 20%;
  left: -10%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
  position: relative;
  z-index: 1;
}

.hero-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: 'DM Mono', monospace;
  font-size: 0.8125rem;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid var(--accent-glow);
  padding: 0.375rem 0.875rem;
  border-radius: 999px;
  margin-bottom: 2rem;
  animation: fadeUp 0.6s ease both;
}

.dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

.hero-name {
  font-size: clamp(2.5rem, 7vw, 5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 0.9;
  margin-bottom: 1.5rem;
  animation: fadeUp 0.6s 0.1s ease both;
}

.hero-name span { color: var(--accent); }

.hero-title {
  font-family: 'DM Mono', monospace;
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  animation: fadeUp 0.6s 0.2s ease both;
}

.hero-desc {
  max-width: 520px;
  color: var(--text-muted);
  font-size: 1.0625rem;
  line-height: 1.7;
  margin-bottom: 2.5rem;
  animation: fadeUp 0.6s 0.3s ease both;
}

.hero-ctas {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
  animation: fadeUp 0.6s 0.4s ease both;
}

.hero-links {
  display: flex;
  gap: 1.5rem;
  animation: fadeUp 0.6s 0.5s ease both;
}

.hero-social {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: 'DM Mono', monospace;
  font-size: 0.8125rem;
  color: var(--text-hint);
  transition: color 0.2s;
}

.hero-social:hover { color: var(--accent); }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── BUTTONS ───────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent);
  color: #0a0a0f;
  font-family: 'DM Mono', monospace;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.75rem 1.75rem;
  border-radius: 6px;
  transition: all 0.2s;
}

.btn-primary:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--text-muted);
  font-family: 'DM Mono', monospace;
  font-size: 0.875rem;
  padding: 0.75rem 1.75rem;
  border-radius: 6px;
  border: 1px solid var(--border-bright);
  transition: all 0.2s;
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── SECTIONS ──────────────────────────────────────────────── */
.section { padding: 6rem 2rem; }
.section-alt { background: var(--bg-alt); }

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

.section-tag {
  font-family: 'DM Mono', monospace;
  font-size: 0.8125rem;
  color: var(--accent);
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 3rem;
  letter-spacing: -0.02em;
}

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

.about-text h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.about-text p {
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 1rem;
  font-size: 1.0625rem;
}

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

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  transition: border-color 0.2s;
}

.stat-card:hover { border-color: var(--border-bright); }

.stat-num {
  font-family: 'Syne', sans-serif;
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.03em;
}

.stat-label {
  font-size: 0.8125rem;
  color: var(--text-hint);
  margin-top: 0.25rem;
  font-family: 'DM Mono', monospace;
}

/* ── SKILLS ────────────────────────────────────────────────── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.skill-group {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
}

.skill-group-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  background: var(--tag-bg);
  color: var(--tag-color);
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  padding: 0.3rem 0.75rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  transition: all 0.2s;
}

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

/* ── PROJECT CARD ──────────────────────────────────────────── */
.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  transition: border-color 0.2s;
}

.project-card:hover { border-color: var(--border-bright); }

.project-card-inner {
  padding: 2.5rem;
}

.project-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.project-badge {
  font-family: 'DM Mono', monospace;
  font-size: 0.7rem;
  background: var(--accent-dim);
  color: var(--accent);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  border: 1px solid var(--accent-glow);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.project-year {
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-hint);
}

.project-title {
  font-size: 1.875rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.project-desc {
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.75;
  margin-bottom: 1.5rem;
}

.project-highlights {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  margin-bottom: 1.5rem;
}

.highlight {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.highlight-icon { flex-shrink: 0; }

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.project-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Code decoration panel */
.project-card-decoration {
  background: var(--code-bg);
  padding: 2.5rem 2rem;
  display: flex;
  align-items: center;
  border-left: 1px solid var(--border);
}

.code-snippet {
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  line-height: 1.9;
  width: 100%;
}

.code-line { white-space: nowrap; }
.c-comment { color: #555580; }
.c-cmd { color: #7cffcb; }
.c-str { color: #ffcc88; }
.c-var { color: #88aaff; }
.c-num { color: #ff8888; }
.c-kw { color: #cc88ff; }

/* ── CONTACT ───────────────────────────────────────────────── */
.contact-sub {
  color: var(--text-muted);
  font-size: 1.0625rem;
  margin-bottom: 3rem;
  margin-top: -1.5rem;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.contact-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.contact-icon {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.contact-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-hint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.contact-value {
  font-size: 0.9375rem;
  color: var(--text-muted);
}

/* ── FOOTER ────────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  padding: 2rem;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-copy {
  font-family: 'DM Mono', monospace;
  font-size: 0.8125rem;
  color: var(--text-hint);
}

/* ── RESPONSIVE ────────────────────────────────────────────── */
@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .skills-grid { grid-template-columns: 1fr; }
  .project-card { grid-template-columns: 1fr; }
  .project-card-decoration { display: none; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-burger { display: flex; }
  .nav-inner { padding: 0 1.25rem; }

  .hero { padding: 5rem 1.25rem 3rem; }
  .section { padding: 4rem 1.25rem; }

  .about-stats { grid-template-columns: 1fr 1fr; }
  .hero-ctas { flex-direction: column; }
  .btn-primary, .btn-ghost { text-align: center; justify-content: center; }

  .footer-inner { flex-direction: column; gap: 0.75rem; text-align: center; }

  .nav-logo { font-size: 1rem; }
}