/* ── DESIGN TOKENS ── */
:root {
  --bg-primary: #07080d;
  --bg-secondary: #0d0f16;
  --bg-card: #11131c;
  --bg-card-hover: #161925;
  --border: #1c1f2e;
  --border-accent: #2a3050;
  --text-primary: #e2e4ed;
  --text-secondary: #8890a8;
  --text-dim: #555c74;
  --accent: #4af0c0;
  --accent-dim: rgba(74, 240, 192, 0.08);
  --accent-glow: rgba(74, 240, 192, 0.15);
  --accent-blue: #5b8af5;
  --font-mono: 'IBM Plex Mono', monospace;
  --font-sans: 'Sora', sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

/* Dot grid background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle, var(--border) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.4;
  pointer-events: none;
  z-index: 0;
}

/* Gradient orb */
body::after {
  content: '';
  position: fixed;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(74, 240, 192, 0.04) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.container {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ── NAV ── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(7, 8, 13, 0.8);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 60px;
}

.nav-logo {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-logo span { color: var(--text-dim); }

.nav-links {
  display: flex;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 6px 14px;
  border-radius: 6px;
  transition: all 0.2s;
  letter-spacing: 0.02em;
}

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

/* ── HERO ── */
.hero {
  padding: 160px 0 100px;
  position: relative;
}

.hero-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.hero-label::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 1px;
  background: var(--accent);
}

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.4rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: -0.03em;
}

.hero h1 .accent { color: var(--accent); }

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 540px;
  line-height: 1.8;
  font-weight: 300;
}

.hero-links {
  margin-top: 36px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-links a {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 10px 22px;
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.25s;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-primary);
  font-weight: 600;
}

.btn-primary:hover {
  box-shadow: 0 0 24px var(--accent-glow);
  transform: translateY(-1px);
}

.btn-secondary {
  border: 1px solid var(--border-accent);
  color: var(--text-secondary);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

/* ── SECTIONS ── */
section {
  padding: 80px 0;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 48px;
}

.section-number {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 500;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.section-line {
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ── ABOUT ── */
.about-content {
  display: grid;
  gap: 24px;
}

.about-content p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 300;
}

.about-content strong {
  color: var(--text-primary);
  font-weight: 500;
}

/* ── SKILLS ── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.skill-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  transition: all 0.3s;
}

.skill-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
  transform: translateY(-2px);
}

.skill-card h3 {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.skill-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-secondary);
  background: rgba(136, 144, 168, 0.08);
  padding: 4px 10px;
  border-radius: 4px;
  border: 1px solid var(--border);
}

/* ── EXPERIENCE ── */
.experience-list {
  display: grid;
  gap: 4px;
}

.exp-item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
}

.exp-item:last-child { border-bottom: none; }

.exp-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  padding-top: 4px;
}

.exp-role {
  font-size: 1.05rem;
  font-weight: 500;
  margin-bottom: 4px;
}

.exp-company {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 12px;
}

.exp-desc {
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 300;
  line-height: 1.7;
}

/* ── WRITING ── */
.writing-list {
  display: grid;
  gap: 4px;
}

.writing-item {
  display: block;
  text-decoration: none;
  color: inherit;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-card);
  transition: all 0.3s;
  margin-bottom: 12px;
}

.writing-item:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
  transform: translateX(4px);
}

.writing-meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-bottom: 8px;
  display: flex;
  gap: 16px;
}

.writing-item h3 {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 6px;
}

.writing-item p {
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 300;
}

.writing-cta {
  margin-top: 24px;
  text-align: center;
}

.writing-cta a {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s;
}

.writing-cta a:hover {
  color: var(--accent);
}

/* ── CONTACT ── */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-card);
  text-decoration: none;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  transition: all 0.25s;
}

.contact-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
  transform: translateY(-2px);
}

.contact-icon {
  width: 18px;
  height: 18px;
  opacity: 0.6;
}

/* ── FOOTER ── */
footer {
  padding: 48px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

footer p {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
}

footer .accent { color: var(--accent); }

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

.hero-label, .hero h1, .hero-subtitle, .hero-links {
  animation: fadeUp 0.6s ease-out both;
}
.hero h1 { animation-delay: 0.1s; }
.hero-subtitle { animation-delay: 0.2s; }
.hero-links { animation-delay: 0.3s; }

/* ── RESPONSIVE ── */
@media (max-width: 640px) {
  .nav-links { display: none; }
  .exp-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .hero { padding: 120px 0 60px; }
  section { padding: 60px 0; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border-accent); border-radius: 3px; }

/* ══════════════════════════════════════════════
   WRITING LIST PAGE & SINGLE POST STYLES
   (Not in prototype — added for Hugo blog)
   ══════════════════════════════════════════════ */

/* ── Writing List Page ── */
.page-header {
  padding: 140px 0 40px;
}

.page-header h1 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.page-header p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 300;
}

/* ── Single Post ── */
.post-header {
  padding: 140px 0 40px;
}

.post-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  line-height: 1.2;
}

.post-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.post-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.post-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 4px 12px;
  border-radius: 4px;
  border: 1px solid rgba(74, 240, 192, 0.12);
  text-decoration: none;
  transition: all 0.2s;
}

.post-tag:hover {
  background: var(--accent-glow);
}

/* ── Markdown Content Rendering ── */
.post-content {
  max-width: 720px;
  padding-bottom: 80px;
}

.post-content h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-top: 48px;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.post-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 36px;
  margin-bottom: 12px;
}

.post-content h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-top: 28px;
  margin-bottom: 8px;
}

.post-content p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 300;
  line-height: 1.85;
  margin-bottom: 20px;
}

.post-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: opacity 0.2s;
}

.post-content a:hover {
  opacity: 0.8;
}

.post-content strong {
  color: var(--text-primary);
  font-weight: 500;
}

.post-content em {
  color: var(--text-secondary);
}

.post-content ul, .post-content ol {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 300;
  line-height: 1.85;
  margin-bottom: 20px;
  padding-left: 24px;
}

.post-content li {
  margin-bottom: 6px;
}

.post-content blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 20px;
  margin: 28px 0;
  color: var(--text-secondary);
  font-style: italic;
}

.post-content blockquote p {
  margin-bottom: 0;
}

.post-content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 2px 6px;
  border-radius: 4px;
}

.post-content pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px 24px;
  overflow-x: auto;
  margin: 24px 0;
}

.post-content pre code {
  background: none;
  padding: 0;
  color: var(--text-primary);
  font-size: 0.82rem;
  line-height: 1.7;
}

.post-content img {
  max-width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
  margin: 24px 0;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.88rem;
}

.post-content th {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  text-align: left;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border-accent);
}

.post-content td {
  color: var(--text-secondary);
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
}

.post-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 40px 0;
}

/* ── Back Link ── */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  text-decoration: none;
  margin-bottom: 20px;
  transition: color 0.2s;
}

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