/*
 * style.css
 * AcouZ landing page — visual styles.
 *
 * Design tokens mirror the app's DARK theme (src/acouz/ui/styles.py).
 * Layout: mobile-first, single breakpoint at 768 px and 1024 px.
 */

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

/* ── Design tokens ───────────────────────────────────────────────── */
:root {
  --bg:           #121814;
  --bg-card:      #1E2822;
  --bg-card2:     #181F1B;
  --border:       #2E3D37;
  --accent:       #1DB954;
  --accent-lt:    #1ED760;
  --accent-dark:  #17A34A;
  --text-1:       #E8EDE9;
  --text-2:       #8FA89C;
  --text-3:       #526560;
  --radius-lg:    24px;
  --radius-md:    14px;
  --radius-sm:    8px;
  --transition:   0.25s cubic-bezier(.4, 0, .2, 1);
}

/* ── Base ────────────────────────────────────────────────────────── */
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text-1);
  font-family: 'Segoe UI Variable', 'Segoe UI', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* Subtle noise grain over the whole page */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  opacity: 0.025;
  pointer-events: none;
  z-index: 0;
}

/* ── Layout helpers ──────────────────────────────────────────────── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ── Buttons ─────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-dark);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(29, 185, 84, 0.35);
}

.btn-ghost {
  background: transparent;
  color: var(--text-2);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  color: var(--text-1);
  border-color: var(--accent);
  background: rgba(29, 185, 84, 0.08);
}

/* ── Navigation ──────────────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  backdrop-filter: blur(20px) saturate(180%);
  background: rgba(18, 24, 20, 0.75);
  border-bottom: 1px solid var(--border);
  transition: border-color var(--transition);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.3px;
}
.nav-logo svg { width: 28px; height: 28px; border-radius: 7px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-links a {
  font-size: 14px;
  color: var(--text-2);
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--text-1); }

/* ── Hero ────────────────────────────────────────────────────────── */
.hero {
  position: relative;
  padding: 160px 0 120px;
  text-align: center;
  overflow: hidden;
}

/* Radial purple glow */
.hero::after {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -60%);
  width: 700px; height: 500px;
  background: radial-gradient(ellipse, rgba(29, 185, 84, 0.18) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.hero > * { position: relative; z-index: 1; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 20px;
  background: rgba(29, 185, 84, 0.12);
  border: 1px solid rgba(29, 185, 84, 0.3);
  font-size: 13px;
  color: var(--accent-lt);
  margin-bottom: 32px;
  letter-spacing: 0.01em;
}

.hero-badge .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1;   transform: scale(1);   }
  50%       { opacity: 0.5; transform: scale(0.8); }
}

.hero h1 {
  font-size: clamp(42px, 7vw, 80px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -2px;
  margin-bottom: 24px;
}

.hero h1 span {
  background: linear-gradient(135deg, var(--accent-lt) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: clamp(16px, 2.5vw, 20px);
  color: var(--text-2);
  max-width: 520px;
  margin: 0 auto 44px;
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

.btn-hero { padding: 14px 32px; font-size: 15px; border-radius: 12px; }

.hero-note {
  margin-top: 16px;
  font-size: 12px;
  color: var(--text-3);
}

/* ── Demo window ─────────────────────────────────────────────────── */
.demo-wrap { padding: 0 0 100px; }

/* demo.gif is 1290×829 — aspect ≈ 1290/829 */
.demo-window {
  max-width: 960px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--bg-card);
  overflow: hidden;
  box-shadow:
    0 0 0 1px rgba(29, 185, 84, 0.1),
    0 40px 80px rgba(0, 0, 0, 0.5);
}

/* second demo window wraps the 16:9 example.gif */
.demo-window--wide {
  max-width: 1100px;
}

.demo-titlebar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 18px;
  background: var(--bg-card2);
  border-bottom: 1px solid var(--border);
}

.demo-dot { width: 12px; height: 12px; border-radius: 50%; }

.demo-body {
  /* exact ratio of demo.gif: 1290/829 ≈ 1.557 */
  aspect-ratio: 1290 / 829;
  background: #121814;
  overflow: hidden;
  line-height: 0;
}

/* example.gif is 1920×1080 — standard 16:9 */
.demo-body--wide {
  aspect-ratio: 16 / 9;
}

.demo-body img { width: 100%; height: 100%; object-fit: fill; display: block; }

.demo-placeholder { text-align: center; color: var(--text-3); }
.demo-placeholder svg {
  width: 48px; height: 48px;
  margin-bottom: 12px;
  opacity: 0.4;
}
.demo-placeholder p { font-size: 14px; }

/* ── Stats ───────────────────────────────────────────────────────── */
.stats { padding: 0 0 100px; }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.stat-item {
  background: var(--bg-card);
  padding: 40px 32px;
  text-align: center;
}

.stat-value {
  font-size: 48px;
  font-weight: 800;
  letter-spacing: -2px;
  background: linear-gradient(135deg, var(--accent-lt), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  margin-top: 6px;
  font-size: 14px;
  color: var(--text-2);
}

/* ── Section header ──────────────────────────────────────────────── */
.section-header { text-align: center; margin-bottom: 60px; }

.section-eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.section-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.15;
}

.section-sub {
  margin-top: 14px;
  font-size: 17px;
  color: var(--text-2);
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* ── Features ────────────────────────────────────────────────────── */
.features { padding: 0 0 120px; }

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.feat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.feat-card:hover {
  border-color: rgba(29, 185, 84, 0.4);
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.feat-card.wide { grid-column: span 2; }

.feat-icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(29, 185, 84, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feat-icon svg {
  width: 22px; height: 22px;
  stroke: var(--accent-lt);
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.feat-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.3px;
}

.feat-card p { font-size: 14px; color: var(--text-2); line-height: 1.65; }

/* ── How it works ────────────────────────────────────────────────── */
.how { padding: 0 0 120px; }

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  position: relative;
}

/* Connecting dashed line between steps */
.steps::before {
  content: '';
  position: absolute;
  top: 28px;
  left: calc(16.6% + 8px);
  right: calc(16.6% + 8px);
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), var(--border), transparent);
}

.step {
  text-align: center;
  padding: 36px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  position: relative;
}

.step-num {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  font-size: 16px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  position: relative;
  z-index: 1;
}

.step h3 { font-size: 16px; font-weight: 700; margin-bottom: 10px; }
.step p   { font-size: 14px; color: var(--text-2); line-height: 1.65; }

/* ── Open source ─────────────────────────────────────────────────── */
.opensource { padding: 0 0 120px; }

.oss-card {
  background: linear-gradient(135deg, rgba(29, 185, 84, 0.1) 0%, rgba(23, 163, 74, 0.05) 100%);
  border: 1px solid rgba(29, 185, 84, 0.25);
  border-radius: var(--radius-lg);
  padding: 64px 48px;
  text-align: center;
}

.oss-card h2 {
  font-size: clamp(26px, 3.5vw, 38px);
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.oss-card p {
  font-size: 16px;
  color: var(--text-2);
  max-width: 460px;
  margin: 0 auto 36px;
}

.oss-actions { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }

/* ── Download CTA ────────────────────────────────────────────────── */
.download { padding: 0 0 140px; }

.download-card {
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 80px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.download-card::before {
  content: '';
  position: absolute;
  top: -120px; left: 50%;
  transform: translateX(-50%);
  width: 500px; height: 300px;
  background: radial-gradient(ellipse, rgba(29, 185, 84, 0.2), transparent 70%);
  pointer-events: none;
}

.download-card > * { position: relative; }

.download-card h2 {
  font-size: clamp(28px, 4vw, 46px);
  font-weight: 800;
  letter-spacing: -1.5px;
  margin-bottom: 16px;
}

.download-card > p { font-size: 17px; color: var(--text-2); margin-bottom: 40px; }

.btn-download { padding: 16px 40px; font-size: 16px; border-radius: 14px; }

.platform-badge {
  margin-top: 20px;
  font-size: 13px;
  color: var(--text-3);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

/* ── Footer ──────────────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 700;
}
.footer-logo svg { width: 24px; height: 24px; border-radius: 6px; }

.footer-links { display: flex; gap: 24px; }
.footer-links a { font-size: 13px; color: var(--text-3); transition: color var(--transition); }
.footer-links a:hover { color: var(--text-1); }

.footer-copy { font-size: 12px; color: var(--text-3); }

/* ── Hotkey chip ─────────────────────────────────────────────────── */
.chip {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 6px;
  background: rgba(29, 185, 84, 0.12);
  border: 1px solid rgba(29, 185, 84, 0.3);
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-lt);
  font-family: 'Consolas', 'Cascadia Code', monospace;
}

/* ── Responsive ──────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .feat-card.wide { grid-column: span 2; }
}

@media (max-width: 768px) {
  .container          { padding: 0 20px; }
  .nav-links          { display: none; }
  .features-grid      { grid-template-columns: 1fr; }
  .feat-card.wide     { grid-column: span 1; }
  .steps              { grid-template-columns: 1fr; }
  .steps::before      { display: none; }
  .stats-grid         { grid-template-columns: 1fr; }
  .oss-card,
  .download-card      { padding: 48px 24px; }
  .footer-inner       { flex-direction: column; text-align: center; }
  .footer-links       { flex-wrap: wrap; justify-content: center; }
}

/* === i18n + screenshots additions === */

/* ── Language toggle pill ────────────────────────────────────────── */
.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-2);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition);
  line-height: 1;
}

.lang-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Screenshots section ─────────────────────────────────────────── */
.screenshots {
  padding: 0 0 100px;
}

.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 960px;
  margin: 0 auto;
}

.screenshot-item {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-card);
  box-shadow:
    0 0 0 1px rgba(29, 185, 84, 0.1),
    0 40px 80px rgba(0, 0, 0, 0.5);
}

.screenshot-item img {
  width: 100%;
  height: auto;
  display: block;
}

.screenshot-caption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--text-3);
  background: var(--bg-card2);
  border-top: 1px solid var(--border);
}

@media (max-width: 768px) {
  .screenshot-grid { grid-template-columns: 1fr; }
}