/* ============================================================
   Leo Chen — leochen.space
   Shared Stylesheet
   ============================================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Share+Tech+Mono&display=swap');

/* ── Design Tokens ─────────────────────────────────────────── */
:root {
  --bg:       #0f0f14;
  --surface:  #16161e;
  --border:   #2a2a3a;
  --text:     #e8e8f0;
  --muted:    #7070a0;
  --accent:   #00e5ff;
  --accent-dim: rgba(0, 229, 255, 0.15);

  --font-heading: 'Orbitron', sans-serif;
  --font-body:    system-ui, 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:    'Share Tech Mono', monospace;

  --nav-h: 64px;
  --radius: 8px;
  --transition: 0.2s ease;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

img { display: block; max-width: 100%; height: auto; }

/* ── Typography ────────────────────────────────────────────── */
h1, h2, h3 {
  font-family: var(--font-heading);
  line-height: 1.2;
  letter-spacing: 0.02em;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: 1.1rem; }

.mono { font-family: var(--font-mono); }

/* ── Navigation ────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  background: rgba(15, 15, 20, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  gap: 2rem;
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 900;
  color: var(--accent);
  letter-spacing: 0.08em;
  white-space: nowrap;
  flex-shrink: 0;
}
.nav-logo:hover { text-decoration: none; opacity: 0.85; }

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

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius);
  letter-spacing: 0.05em;
  transition: color var(--transition), background var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  background: var(--accent-dim);
  text-decoration: none;
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  margin-left: auto;
  padding: 4px;
  background: none;
  border: none;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

@media (max-width: 640px) {
  .nav-toggle { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 1rem 1.5rem;
    gap: 0.25rem;
  }
  .nav-links.open { display: flex; }
  .nav-links a { font-size: 0.9rem; }
}

/* ── Page Container ────────────────────────────────────────── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.page-content {
  padding: 3rem 0 5rem;
}

/* ── Section ───────────────────────────────────────────────── */
.section-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.section-title {
  margin-bottom: 2.5rem;
}

/* ── Cards ─────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 8px 32px rgba(0, 229, 255, 0.08);
}

.card-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--accent);
  position: relative;
  overflow: hidden;
  text-decoration: none;
  cursor: pointer;
}

.card-thumb::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 60%, rgba(0,0,0,0.4));
}

.card-body {
  padding: 1.25rem;
}

.card-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid rgba(0,229,255,0.25);
  border-radius: 4px;
  padding: 0.15rem 0.5rem;
  letter-spacing: 0.08em;
  margin-bottom: 0.6rem;
}

.card-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: 0.02em;
}

.card-desc {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.5;
  margin-bottom: 1rem;
}

.card-actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

/* ── Grid ──────────────────────────────────────────────────── */
.grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

@media (max-width: 480px) {
  .grid { grid-template-columns: 1fr; }
}

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
  font-weight: 700;
}
.btn-primary:hover {
  background: #00ccee;
  border-color: #00ccee;
  text-decoration: none;
  color: #000;
}

.btn-ghost {
  background: transparent;
  color: var(--accent);
  border-color: var(--border);
}
.btn-ghost:hover {
  border-color: var(--accent);
  background: var(--accent-dim);
  text-decoration: none;
}

/* ── Hero ──────────────────────────────────────────────────── */
.hero {
  min-height: calc(100vh - var(--nav-h));
  display: flex;
  align-items: center;
  padding: 4rem 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 70% 40%, rgba(0,229,255,0.05) 0%, transparent 60%),
    radial-gradient(ellipse 40% 30% at 20% 70%, rgba(120,0,255,0.04) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content { position: relative; }

.hero-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.hero-name {
  margin-bottom: 0.5rem;
  word-break: break-word;
}

.hero-tagline {
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.hero-accent-line {
  height: 2px;
  width: 80px;
  background: linear-gradient(90deg, var(--accent), transparent);
  margin-bottom: 1.5rem;
  animation: accentGrow 1s ease-out forwards;
}

@keyframes accentGrow {
  from { width: 0; opacity: 0; }
  to   { width: 80px; opacity: 1; }
}

.hero-bio {
  max-width: 520px;
  color: var(--muted);
  margin-bottom: 2.5rem;
  font-size: 1rem;
}

.hero-nav-cards {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.hero-nav-card {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1rem 1.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  min-width: 130px;
}
.hero-nav-card:hover {
  border-color: var(--accent);
  background: var(--accent-dim);
  transform: translateY(-2px);
  text-decoration: none;
}
.hero-nav-card-icon { font-size: 1.5rem; }
.hero-nav-card-title {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  color: var(--text);
  letter-spacing: 0.06em;
}
.hero-nav-card-sub {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--muted);
}

/* ── Page Header (inner pages) ─────────────────────────────── */
.page-header {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
}

.back-link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  margin-bottom: 1.2rem;
  transition: color var(--transition);
}
.back-link:hover { color: var(--accent); text-decoration: none; }

/* ── Game Page ─────────────────────────────────────────────── */
.game-iframe-wrap {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  margin-bottom: 1rem;
  position: relative;
}

.game-iframe-wrap iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.game-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.game-meta-block h4 {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}

.game-meta-block p, .game-meta-block ul {
  font-size: 0.875rem;
  color: var(--text);
}

.controls-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.controls-list li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
}

kbd {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1rem 0.4rem;
  color: var(--accent);
}

/* ── Tags / Skills ─────────────────────────────────────────── */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.25rem 0.6rem;
  letter-spacing: 0.05em;
}

/* ── Form ──────────────────────────────────────────────────── */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 0.65rem 0.85rem;
  transition: border-color var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0,229,255,0.08);
}

.form-group textarea { resize: vertical; min-height: 130px; }

.form-success {
  display: none;
  text-align: center;
  padding: 2rem;
  background: var(--surface);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  color: var(--accent);
  font-family: var(--font-mono);
}

/* ── Category Filter ───────────────────────────────────────── */
.filter-tabs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.filter-tab {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.4rem 1rem;
  border: 1px solid var(--border);
  border-radius: 100px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: all var(--transition);
  letter-spacing: 0.06em;
}
.filter-tab:hover,
.filter-tab.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

/* ── Placeholder Card ──────────────────────────────────────── */
.card-placeholder .card-thumb {
  background: repeating-linear-gradient(
    45deg,
    var(--surface) 0px,
    var(--surface) 10px,
    #1a1a28 10px,
    #1a1a28 20px
  );
  font-size: 2rem;
  opacity: 0.6;
}

/* ── About Page ────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 3rem;
  align-items: start;
}

@media (max-width: 640px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

.avatar {
  width: 100%;
  aspect-ratio: 1;
  border-radius: var(--radius);
  background: var(--surface);
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  overflow: hidden;
}

.about-bio {
  margin-bottom: 1.5rem;
  color: var(--muted);
  line-height: 1.75;
}

.about-links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

/* ── Footer ────────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
}

.footer-links {
  display: flex;
  gap: 1.25rem;
  list-style: none;
}

.footer-links a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--accent); text-decoration: none; }

/* ── Utility ───────────────────────────────────────────────── */
.text-accent { color: var(--accent); }
.text-muted  { color: var(--muted); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }