/* ─── Theme Variables ────────────────────────────────────────── */
:root {
  --bg:          #0C0C0E;
  --bg-surface:  #161618;
  --bg-elevated: #1C1C1F;
  --text:        #F0EDE8;
  --text-muted:  #8A8680;
  --text-dim:    #5C5955;
  --accent:      #C4A265;
  --accent-hover:#D4B478;
  --border:      #2A2926;
  --good:        #6ee7b7;
  --bad:         #fca5a5;
  --glow:        rgba(196, 162, 101, 0.10);
}

[data-theme="light"] {
  --bg:          #FAF8F5;
  --bg-surface:  #F0EDE8;
  --bg-elevated: #E8E4DE;
  --text:        #1A1A1A;
  --text-muted:  #6B6660;
  --text-dim:    #9C9690;
  --accent:      #9C7D3C;
  --accent-hover:#B08E48;
  --border:      #D8D4CE;
  --good:        #15803d;
  --bad:         #dc2626;
  --glow:        rgba(156, 125, 60, 0.08);
}

/* ─── Reset & Base ───────────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s, color 0.3s;
}
a { color: inherit; text-decoration: none; }
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

/* ─── Nav ────────────────────────────────────────────────────── */
nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg-elevated) 85%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s, border-color 0.3s;
}
.nav-inner {
  max-width: 1100px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.nav-logo-img {
  height: 56px;
  width: auto;
  display: block;
  filter: invert(1);
  transition: filter 0.3s;
}
[data-theme="light"] .nav-logo-img {
  filter: none;
}
.nav-right {
  display: flex; gap: 24px; align-items: center;
}
.nav-links {
  display: flex; gap: 24px; align-items: center; font-size: 0.9rem;
}
.nav-links a {
  color: var(--text-muted);
  transition: color 0.2s;
}
.nav-links a:hover {
  color: var(--text);
}
.btn-nav {
  background: var(--accent);
  color: var(--bg) !important;
  padding: 6px 16px; border-radius: 6px; font-weight: 600;
  transition: background 0.2s;
}
.btn-nav:hover { background: var(--accent-hover); }

/* Nav controls (theme toggle + language switcher) */
.nav-controls {
  display: flex; align-items: center; gap: 8px;
  border-left: 1px solid var(--border);
  padding-left: 20px;
  margin-left: 4px;
}

/* Theme toggle */
#theme-toggle {
  background: none; border: none; cursor: pointer;
  color: var(--text-muted); padding: 6px;
  border-radius: 6px; display: flex; align-items: center; justify-content: center;
  transition: color 0.2s, background 0.2s;
}
#theme-toggle:hover {
  color: var(--text);
  background: var(--bg-surface);
}

/* Language switcher */
.lang-switcher {
  display: flex; gap: 2px;
}
.lang-option {
  background: none; border: none; cursor: pointer;
  color: var(--text-dim); font-size: 0.72rem; font-weight: 600;
  padding: 4px 6px; border-radius: 4px;
  letter-spacing: 0.04em;
  transition: color 0.2s, background 0.2s;
  font-family: inherit;
}
.lang-option:hover {
  color: var(--text-muted);
  background: var(--bg-surface);
}
.lang-option.active {
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}

/* ─── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-block; padding: 12px 28px; border-radius: 8px;
  font-weight: 600; font-size: 0.95rem; transition: all 0.2s;
}
.btn-primary {
  background: var(--accent); color: var(--bg);
}
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); }
.btn-secondary {
  background: transparent; color: var(--text-muted);
  border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--text); }
.btn-large { padding: 16px 40px; font-size: 1.05rem; }

/* ─── Hero ───────────────────────────────────────────────────── */
.hero {
  padding: 160px 0 80px;
  text-align: center;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, var(--glow), transparent);
}
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 700; line-height: 1.15;
  letter-spacing: -0.02em;
}
.subtitle {
  margin: 20px auto 0; max-width: 560px;
  color: var(--text-muted); font-size: 1.1rem; line-height: 1.7;
}
.hero-actions { margin-top: 36px; display: flex; gap: 14px; justify-content: center; }
.hero-stat {
  margin-top: 60px; display: flex; flex-direction: column; align-items: center; gap: 8px;
}
.stat { display: flex; align-items: center; gap: 16px; }
.stat-value { font-size: 2rem; font-weight: 700; color: var(--text-dim); }
.stat-value.highlight { color: var(--accent); }
.stat-arrow { font-size: 1.5rem; color: var(--border); }
.stat-label { color: var(--text-dim); font-size: 0.85rem; }

/* ─── Models ─────────────────────────────────────────────────── */
.models { padding: 100px 0; }
h2 {
  font-size: 2rem; font-weight: 700; text-align: center;
  letter-spacing: -0.01em;
}
.section-desc {
  text-align: center; color: var(--text-dim); margin: 10px 0 48px;
  font-size: 1.05rem;
}
.model-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}
.model-card {
  background: var(--bg-surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 24px; transition: all 0.25s; position: relative; cursor: pointer;
  display: block;
}
.model-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.model-badge {
  display: inline-block; padding: 3px 10px; border-radius: 20px;
  font-size: 0.7rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.05em; margin-bottom: 12px;
}
.model-badge.lossless { background: #065f46; color: #6ee7b7; }
.model-badge.extreme  { background: #7c2d12; color: #fdba74; }
.model-badge.ja       { background: #1e3a5f; color: #93c5fd; }
.model-badge.experimental { background: color-mix(in srgb, var(--text-dim) 30%, transparent); color: var(--text-muted); }
.model-card h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 4px; }
.model-base { font-size: 0.8rem; color: var(--text-dim); margin-bottom: 16px; }
.model-stats {
  display: flex; gap: 16px; margin-bottom: 14px;
  padding-bottom: 14px; border-bottom: 1px solid var(--border);
}
.model-stat-item { display: flex; flex-direction: column; }
.model-stat-item .label { font-size: 0.7rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.05em; }
.model-stat-item .value { font-size: 0.95rem; font-weight: 600; }
.model-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.5; }

/* ─── Technology ─────────────────────────────────────────────── */
.technology {
  padding: 100px 0;
  background: linear-gradient(180deg, var(--bg), var(--bg-surface), var(--bg));
  transition: background 0.3s;
}
.tech-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px; margin-bottom: 60px;
}
.tech-card {
  background: var(--bg-surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 28px;
  transition: border-color 0.25s, background 0.3s;
}
.tech-card:hover { border-color: var(--accent); }
.tech-icon { font-size: 1.6rem; margin-bottom: 14px; }
.tech-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 8px; }
.tech-card p { font-size: 0.88rem; color: var(--text-muted); line-height: 1.6; }

/* Comparison table */
.comparison { max-width: 700px; margin: 0 auto; }
.comparison h3 { font-size: 1.2rem; font-weight: 600; margin-bottom: 20px; text-align: center; }
.comparison-table {
  background: var(--bg-surface); border: 1px solid var(--border); border-radius: 12px;
  overflow: hidden;
  transition: background 0.3s, border-color 0.3s;
}
.comp-row {
  display: grid; grid-template-columns: 1fr 1fr 1fr;
  padding: 14px 20px; font-size: 0.88rem;
}
.comp-row:not(:last-child) { border-bottom: 1px solid var(--border); }
.comp-header { background: var(--bg-elevated); font-weight: 600; font-size: 0.8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; }
.comp-row span:first-child { color: var(--text-muted); }
.good { color: var(--good); }
.bad { color: var(--bad); }

/* ─── Vision ─────────────────────────────────────────────────── */
.vision {
  padding: 100px 0;
}

/* ─── CTA ────────────────────────────────────────────────────── */
.cta {
  padding: 100px 0; text-align: center;
  background: radial-gradient(ellipse 60% 50% at 50% 50%, var(--glow), transparent);
}
.cta h2 { margin-bottom: 16px; }
.cta-detail {
  color: var(--text-muted); font-size: 1rem; line-height: 1.7;
  max-width: 600px; margin: 0 auto 16px;
}
.cta-detail:last-of-type { margin-bottom: 32px; }

/* ─── Footer ─────────────────────────────────────────────────── */
footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
  transition: border-color 0.3s;
}
.footer-inner {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 0.85rem; color: var(--text-dim);
}
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: var(--text-dim); transition: color 0.2s; }
.footer-links a:hover { color: var(--text-muted); }

/* ─── Tools ──────────────────────────────────────────────────── */
.tools { padding: 80px 0; }
.tool-card {
  display: block;
  max-width: 640px;
  margin: 0 auto;
  padding: 32px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.2s, transform 0.2s;
}
.tool-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.tool-header { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.tool-header h3 { margin: 0; font-size: 1.4rem; font-weight: 700; }
.tool-lang {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--accent);
  color: var(--bg);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.tool-tagline { color: var(--text-muted); margin-bottom: 20px; font-size: 0.95rem; }
.tool-features { display: flex; flex-direction: column; gap: 10px; margin-bottom: 20px; }
.tool-feature {
  font-size: 0.88rem;
  color: var(--text-dim);
  padding-left: 20px;
  position: relative;
}
.tool-feature::before {
  content: '\2713';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}
.tool-stats {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-bottom: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.tool-cta {
  display: inline-block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
}

/* ─── Mobile ─────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .nav-links a:not(.btn-nav) { display: none; }
  .nav-controls { border-left: none; padding-left: 0; }
  .lang-switcher { display: none; }
  .hero { padding: 120px 0 60px; }
  .hero-actions { flex-direction: column; align-items: center; }
  .model-grid { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: 1fr; }
  .comp-row { font-size: 0.78rem; padding: 10px 14px; }
  .stat-value { font-size: 1.5rem; }
}

@media (max-width: 480px) {
  .nav-logo-img { height: 28px; }
  .footer-inner { flex-direction: column; gap: 12px; text-align: center; }
}