:root {
  --bg: #ffffff;
  --bg-alt: #f6f7fb;
  --fg: #3a3d45;
  --heading: #17181f;
  --muted: #6f7480;
  --accent: #6d5cff;
  --accent-2: #3ec9a7;
  --accent-soft: rgba(109, 92, 255, 0.08);
  --border: #e8eaf0;
  --card-bg: #ffffff;
  --radius: 16px;
  --max-width: 1080px;
  --font-display: "Space Grotesk", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e0f14;
    --bg-alt: #14151c;
    --fg: #a8acb9;
    --heading: #eceef5;
    --muted: #707684;
    --accent: #8b7cff;
    --accent-2: #43d6b2;
    --accent-soft: rgba(139, 124, 255, 0.12);
    --border: #23252f;
    --card-bg: #171923;
  }
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  transition: background 0.2s ease, color 0.2s ease;
}

.container { width: min(var(--max-width), 90%); margin-inline: auto; }
.narrow { --max-width: 720px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 62px;
}

.brand {
  font-family: var(--font-display);
  font-weight: 600;
  text-decoration: none;
  color: var(--heading);
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-mark {
  font-family: var(--font-mono);
  color: var(--accent);
  font-weight: 500;
}

.nav-links { display: flex; gap: 30px; list-style: none; }

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.94rem;
  font-weight: 500;
  transition: color 0.15s ease;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  width: 20px; height: 2px;
  background: var(--heading);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 88px 0 60px;
  text-align: center;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto;
  height: 560px;
  background:
    radial-gradient(600px 320px at 20% 10%, color-mix(in srgb, var(--accent) 16%, transparent), transparent 70%),
    radial-gradient(600px 320px at 85% 0%, color-mix(in srgb, var(--accent-2) 14%, transparent), transparent 70%);
  pointer-events: none;
}

.hero .container { position: relative; }

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 18px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 7vw, 4.2rem);
  font-weight: 700;
  line-height: 1.12;
  color: var(--heading);
  letter-spacing: -0.02em;
}

.grad {
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  max-width: 560px;
  margin: 22px auto 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-sub strong { color: var(--heading); }

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 30px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.96rem;
  text-decoration: none;
  transition: transform 0.12s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover { box-shadow: 0 8px 22px color-mix(in srgb, var(--accent) 38%, transparent); }

.btn-ghost {
  border: 1px solid var(--border);
  color: var(--heading);
}

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

/* ---------- Terminal card ---------- */
.terminal {
  max-width: 520px;
  margin: 44px auto 0;
  background: #101322;
  border-radius: var(--radius);
  box-shadow: 0 24px 60px rgba(16, 19, 34, 0.35);
  text-align: left;
  overflow: hidden;
}

.terminal-bar {
  display: flex;
  gap: 8px;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.06);
}

.terminal-bar span {
  width: 11px; height: 11px;
  border-radius: 50%;
}

.terminal-bar span:nth-child(1) { background: #ff5f57; }
.terminal-bar span:nth-child(2) { background: #febc2e; }
.terminal-bar span:nth-child(3) { background: #28c840; }

.terminal-body {
  padding: 18px 20px 22px;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  color: #d6dae8;
  line-height: 2;
}

.terminal-body p { white-space: pre-wrap; }

.terminal-body .prompt { color: var(--accent-2); }

.terminal-body .cmd { color: #f3f4fa; }

.terminal-body .out { color: #8a92a8; }

.terminal-body .blinking { animation: blink 1.1s step-end infinite; }

@keyframes blink { 50% { opacity: 0; } }

/* ---------- Sections ---------- */
.section { padding: 84px 0; }

.section-alt { background: var(--bg-alt); }

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 700;
  color: var(--heading);
  letter-spacing: -0.01em;
  margin-bottom: 36px;
}

.section-title .num {
  font-family: var(--font-mono);
  font-size: 0.8em;
  color: var(--accent);
  margin-right: 12px;
}

/* ---------- Works grid ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 22px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

a.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(20, 22, 40, 0.1);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
}

.card-icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-size: 1.3rem;
  background: var(--accent-soft);
}

.card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--heading);
}

.card p { font-size: 0.95rem; color: var(--muted); flex: 1; }

.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 4px;
}

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

.card-tags span {
  font-size: 0.74rem;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 500;
}

.card-link { color: var(--accent); font-weight: 600; font-size: 0.9rem; }

.card-static { cursor: default; }

.card-static:hover { transform: none; box-shadow: none; border-color: var(--border); }

/* ---------- Writing list ---------- */
.writing-list {
  display: grid;
  gap: 0;
}

.writing-row {
  display: grid;
  grid-template-columns: 96px 1fr auto;
  align-items: baseline;
  gap: 20px;
  padding: 20px 4px;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  color: inherit;
  transition: padding-left 0.2s ease;
}

.writing-row:hover { padding-left: 10px; }

.writing-row .date {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--muted);
}

.writing-row .title {
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--heading);
}

.writing-row:hover .title { color: var(--accent); }

.writing-row .tag {
  font-size: 0.75rem;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 2px 10px;
  white-space: nowrap;
}

@media (max-width: 640px) {
  .writing-row { grid-template-columns: 1fr; gap: 4px; }
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 40px;
  align-items: start;
}

.about-text p { color: var(--muted); font-size: 1.02rem; margin-bottom: 18px; }

.skills { display: flex; flex-wrap: wrap; gap: 10px; list-style: none; }

.skills li {
  background: var(--accent-soft);
  color: var(--accent);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 500;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.about-stats > div {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 10px;
  text-align: center;
}

.stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.82rem;
  color: var(--muted);
}

@media (max-width: 820px) {
  .about-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: repeat(3, 1fr); }
}

/* ---------- Contact ---------- */
.contact-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 700;
  color: var(--heading);
  text-align: center;
}

.contact-sub {
  text-align: center;
  color: var(--muted);
  margin: 12px 0 30px;
}

.contact-links {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.88rem;
}

/* ---------- Reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.visible { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 62px;
    left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
    gap: 0;
  }
  .nav-links.open { display: flex; }
  .nav-links a { display: block; padding: 12px 5%; }
  .nav-toggle { display: flex; }
  .hero { padding: 60px 0 40px; }
  .section { padding: 56px 0; }
  .grid { grid-template-columns: 1fr; }
}