/* ============ Theme tokens ============ */
:root {
  --bg: #0a0f14;
  --surface: #0f1720;
  --surface-2: #142030;
  --border: rgba(148, 163, 184, 0.14);
  --border-strong: rgba(148, 163, 184, 0.28);
  --text: #e6edf3;
  --muted: #94a3b8;
  --faint: #5b6b7f;
  --accent: #2dd4bf;
  --accent-2: #22d3ee;
  --accent-soft: rgba(45, 212, 191, 0.12);
  --on-accent: #04201c;
  --pass: #a3e635;
  --warn: #fbbf24;
  --grid: rgba(148, 163, 184, 0.07);
  --shadow: 0 20px 50px -20px rgba(0, 0, 0, 0.6);
}
html.light {
  --bg: #f6f8fa;
  --surface: #ffffff;
  --surface-2: #eef2f6;
  --border: rgba(15, 23, 42, 0.1);
  --border-strong: rgba(15, 23, 42, 0.2);
  --text: #0f172a;
  --muted: #475569;
  --faint: #94a3b8;
  --accent: #0d9488;
  --accent-2: #0891b2;
  --accent-soft: rgba(13, 148, 136, 0.1);
  --on-accent: #ffffff;
  --pass: #4d7c0f;
  --warn: #b45309;
  --grid: rgba(15, 23, 42, 0.05);
  --shadow: 0 20px 50px -24px rgba(15, 23, 42, 0.25);
}

/* ============ Base ============ */
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  font-family: "Space Grotesk", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background-color 0.3s, color 0.3s;
}
.mono { font-family: "JetBrains Mono", ui-monospace, monospace; }
.muted { color: var(--muted); }
.faint { color: var(--faint); }
.accent { color: var(--accent); }
.pass { color: var(--pass); }
b, strong { color: var(--text); font-weight: 600; }
.hl { color: var(--accent); font-style: normal; }
::selection { background: var(--accent); color: var(--on-accent); }

/* Grid backdrop */
.grid-bg {
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 40%, transparent 100%);
}
.glow {
  background: radial-gradient(circle, var(--accent-soft), transparent 65%);
  filter: blur(20px);
}

/* ============ Surfaces ============ */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s, background-color 0.3s;
}
.card-hover:hover { border-color: var(--accent); transform: translateY(-3px); box-shadow: var(--shadow); }

.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--muted);
  font-size: 0.8rem;
}
.tag {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.72rem;
  padding: 3px 8px;
  border-radius: 4px;
  color: var(--accent);
  background: var(--accent-soft);
}
.icon-tile {
  width: 2.5rem; height: 2.5rem; flex-shrink: 0;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 10px;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--border);
}

/* ============ Buttons ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 600;
  transition: transform 0.2s, background-color 0.2s, border-color 0.2s, color 0.2s;
}
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { transform: translateY(-2px); filter: brightness(1.08); }
.btn-ghost { border: 1px solid var(--border-strong); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn svg { transition: transform 0.2s; }
.btn:hover .shift { transform: translateX(3px); }
.icon-btn {
  width: 42px; height: 42px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 10px;
  border: 1px solid var(--border);
  color: var(--muted);
  transition: color 0.2s, border-color 0.2s, transform 0.2s;
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-2px); }

/* ============ Nav ============ */
#nav { transition: background-color 0.3s, border-color 0.3s; border-bottom: 1px solid transparent; }
.nav-scrolled { background: color-mix(in srgb, var(--bg) 85%, transparent); backdrop-filter: blur(12px); border-bottom-color: var(--border) !important; }
.nav-link {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.82rem;
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--muted);
  transition: color 0.2s, background-color 0.2s;
}
.nav-link:hover { color: var(--text); background: var(--surface-2); }
.nav-link .num { color: var(--accent); opacity: 0.7; margin-right: 4px; }
.nav-active { color: var(--accent) !important; background: var(--accent-soft); }
.mobile-menu { background: var(--bg); border-bottom: 1px solid var(--border); }
.caret { animation: blink 1s step-end infinite; color: var(--accent); }

/* Theme toggle icons */
.theme-btn .icon-moon { display: none; }
html.light .theme-btn .icon-sun { display: none; }
html.light .theme-btn .icon-moon { display: block; }

/* ============ Hero terminal ============ */
.terminal { background: #0b1118; border: 1px solid rgba(148, 163, 184, 0.2); border-radius: 14px; box-shadow: var(--shadow); overflow: hidden; color: #cbd5e1; }
.terminal-bar { display: flex; align-items: center; gap: 8px; padding: 12px 16px; border-bottom: 1px solid rgba(148, 163, 184, 0.15); background: #0f1720; }
.terminal-bar i { width: 11px; height: 11px; border-radius: 50%; display: block; }
.terminal-body { padding: 18px 20px; font-family: "JetBrains Mono", monospace; font-size: 0.82rem; line-height: 1.85; min-height: 300px; }
.terminal-body .ok { color: #a3e635; }
.terminal-body .dim { color: #64748b; }
.terminal-body .cmd { color: #2dd4bf; }
.terminal-body .line { opacity: 0; transform: translateY(4px); transition: opacity 0.25s, transform 0.25s; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.terminal-body .line.show { opacity: 1; transform: none; }
.terminal-body .summary { color: #a3e635; font-weight: 700; }
.cursor-block { display: inline-block; width: 8px; height: 1em; background: #2dd4bf; vertical-align: -2px; animation: blink 1s step-end infinite; }

.typing-cursor::after { content: "_"; color: var(--accent); animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

.hero-in { animation: heroIn 0.8s ease-out both; }
.hero-in.d2 { animation-delay: 0.15s; }
@keyframes heroIn { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: none; } }

.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--pass); box-shadow: 0 0 0 0 var(--pass); animation: ping 2s infinite; }
@keyframes ping { 0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--pass) 60%, transparent); } 100% { box-shadow: 0 0 0 8px transparent; } }

/* ============ Section heading ============ */
.sec-head { display: flex; align-items: flex-end; gap: 20px; margin-bottom: 48px; }
.sec-head .rule { flex: 1; height: 1px; background: var(--border); margin-bottom: 12px; }

/* ============ About photo ============ */
.photo-frame { position: relative; }
.photo-frame::before {
  content: ""; position: absolute; inset: 0;
  border: 2px solid var(--accent);
  border-radius: 18px;
  transform: translate(14px, 14px);
  transition: transform 0.3s;
}
.photo-frame:hover::before { transform: translate(8px, 8px); }
.photo-frame .photo { position: relative; border-radius: 18px; overflow: hidden; background: var(--surface-2); aspect-ratio: 4 / 5; }
.photo-frame img { width: 100%; height: 100%; object-fit: cover; filter: grayscale(0.25); transition: filter 0.3s, transform 0.5s; }
.photo-frame:hover img { filter: none; transform: scale(1.03); }

/* ============ Marquee ============ */
.marquee { overflow: hidden; mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent); -webkit-mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent); }
.marquee-track { display: flex; gap: 14px; width: max-content; animation: marquee 30s linear infinite; }
.marquee:hover .marquee-track { animation-play-state: paused; }
@keyframes marquee { to { transform: translateX(-50%); } }
.logo-pill { display: flex; align-items: center; gap: 10px; padding: 10px 18px; border-radius: 999px; border: 1px solid var(--border); background: var(--surface); white-space: nowrap; font-weight: 500; }
.logo-pill img { width: 22px; height: 22px; object-fit: contain; }

/* ============ Changelog ============ */
.changelog { position: relative; }
.changelog::before { content: ""; position: absolute; left: 7px; top: 8px; bottom: 8px; width: 2px; background: linear-gradient(var(--accent), var(--border)); }
@media (min-width: 768px) { .changelog::before { left: 127px; } }
.log-node { position: absolute; left: 0; top: 6px; width: 16px; height: 16px; border-radius: 50%; background: var(--bg); border: 3px solid var(--accent); }
@media (min-width: 768px) { .log-node { left: 120px; } }
.log-current .log-node { background: var(--accent); box-shadow: 0 0 0 5px var(--accent-soft); }

/* ============ Contact ============ */
.input {
  width: 100%;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  color: var(--text);
  outline: none;
  transition: border-color 0.2s;
}
.input::placeholder { color: var(--faint); }
.input:focus { border-color: var(--accent); }

/* ============ Reveal ============ */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.show { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .marquee-track, .caret, .typing-cursor::after, .cursor-block, .status-dot, .hero-in { animation: none; }
  .reveal, .terminal-body .line { opacity: 1; transform: none; transition: none; }
}