/* Happy Sound - unified styling */
:root {
  --bg-0: #0b0d12;
  --bg-1: #12161f;
  --bg-2: #1a2030;
  --card: #1e2535;
  --border: rgba(255,255,255,0.08);
  --fg: #e7ecf5;
  --fg-dim: #98a2b3;
  --fg-soft: #c4cbd6;
  --accent: #ff5722;
  --accent-2: #ffb347;
  --accent-soft: rgba(255,87,34,0.14);
  --ok: #3ddc97;
  --shadow: 0 8px 32px rgba(0,0,0,0.35);
  --radius: 14px;
  --radius-sm: 8px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { background: var(--bg-0); color: var(--fg); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', sans-serif; line-height: 1.6; }
body { min-height: 100vh; display: flex; flex-direction: column; }
a { color: var(--accent-2); text-decoration: none; }
a:hover { color: var(--accent); }

/* Header / nav */
.site-header { border-bottom: 1px solid var(--border); background: rgba(11,13,18,0.85); backdrop-filter: blur(12px); position: sticky; top: 0; z-index: 10; }
.nav {
  max-width: 1200px; margin: 0 auto; padding: 14px 28px;
  display: flex; align-items: center; justify-content: space-between;
}
.brand { font-size: 22px; font-weight: 800; letter-spacing: 0.5px; display: flex; align-items: center; gap: 10px; color: var(--fg); }
.brand-mark {
  display: inline-block; width: 28px; height: 28px; border-radius: 6px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  box-shadow: 0 0 14px rgba(255,87,34,0.5);
}
.brand-sub { color: var(--accent); font-weight: 800; }

.nav-links { display: flex; gap: 26px; list-style: none; }
.nav-links a { color: var(--fg-soft); font-weight: 500; font-size: 15px; padding: 6px 0; border-bottom: 2px solid transparent; transition: all 0.15s; }
.nav-links a:hover, .nav-links a.active { color: var(--fg); border-bottom-color: var(--accent); }

.nav-cta {
  padding: 8px 18px; background: var(--accent); color: #fff !important;
  border-radius: 999px; font-weight: 600; font-size: 14px;
  box-shadow: 0 2px 12px rgba(255,87,34,0.35);
}
.nav-cta:hover { color: #fff !important; filter: brightness(1.08); }

/* Footer */
.site-footer {
  margin-top: auto; padding: 32px 28px;
  border-top: 1px solid var(--border);
  color: var(--fg-dim); font-size: 13px;
  display: flex; justify-content: space-between; max-width: 1200px; width: 100%;
  margin-left: auto; margin-right: auto;
}
.site-footer a { color: var(--fg-dim); }
.site-footer a:hover { color: var(--accent-2); }

/* Generic */
.container { max-width: 1200px; margin: 0 auto; padding: 48px 28px; }
.container-narrow { max-width: 880px; margin: 0 auto; padding: 48px 28px; }
h1 { font-size: 44px; font-weight: 800; line-height: 1.15; letter-spacing: -0.5px; }
h2 { font-size: 30px; font-weight: 700; margin-bottom: 20px; letter-spacing: -0.3px; }
h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; }
p { color: var(--fg-soft); margin-bottom: 12px; }
.lead { font-size: 19px; color: var(--fg-soft); line-height: 1.7; }
.muted { color: var(--fg-dim); }
.accent { color: var(--accent); }
.mono { font-family: 'JetBrains Mono', 'Consolas', monospace; }

/* Hero */
.hero {
  padding: 80px 28px 72px;
  background:
    radial-gradient(ellipse at 80% -10%, rgba(255,87,34,0.18) 0%, transparent 50%),
    radial-gradient(ellipse at -10% 60%, rgba(255,179,71,0.10) 0%, transparent 45%),
    linear-gradient(180deg, var(--bg-0), var(--bg-1));
  border-bottom: 1px solid var(--border);
}
.hero-inner { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.hero-tag { display: inline-block; padding: 6px 14px; background: var(--accent-soft); color: var(--accent-2); border-radius: 999px; font-size: 13px; font-weight: 600; margin-bottom: 20px; }
.hero h1 { margin-bottom: 18px; }
.hero h1 .accent { background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-desc { font-size: 18px; color: var(--fg-soft); margin-bottom: 28px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }

/* Buttons */
.btn {
  display: inline-block; padding: 13px 26px; border-radius: 10px;
  font-weight: 600; font-size: 15px; cursor: pointer;
  border: none; transition: all 0.15s; text-align: center;
}
.btn-primary { background: var(--accent); color: #fff !important; box-shadow: 0 4px 18px rgba(255,87,34,0.35); }
.btn-primary:hover { filter: brightness(1.08); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--fg) !important; border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-2) !important; }
.btn-lg { padding: 16px 32px; font-size: 16px; }

/* Hero visual */
.hero-visual {
  aspect-ratio: 1 / 1; max-width: 460px; margin-left: auto;
  border-radius: var(--radius);
  background:
    radial-gradient(circle at 50% 50%, rgba(255,87,34,0.15) 0%, transparent 60%),
    linear-gradient(135deg, var(--bg-2), var(--card));
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
}
.hero-gauge { width: 80%; max-width: 380px; }

/* Feature grid */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 26px;
  transition: all 0.15s;
}
.feature-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.feature-icon {
  width: 42px; height: 42px; border-radius: 10px;
  background: var(--accent-soft); color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; font-weight: 700; margin-bottom: 14px;
}

/* Audio row */
.audio-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.audio-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 18px;
}
.audio-card h3 { font-size: 15px; margin-bottom: 10px; }
.audio-card audio { width: 100%; }

/* Sections */
.section { padding: 72px 28px; border-bottom: 1px solid var(--border); }
.section:nth-child(even) { background: var(--bg-1); }
.section-inner { max-width: 1200px; margin: 0 auto; }
.section-title { text-align: center; margin-bottom: 12px; }
.section-sub { text-align: center; color: var(--fg-dim); margin-bottom: 40px; font-size: 16px; }

/* Table / comparison */
.tbl { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.tbl th, .tbl td { padding: 14px 16px; text-align: left; border-bottom: 1px solid var(--border); font-size: 14px; }
.tbl th { background: rgba(255,255,255,0.04); font-weight: 600; color: var(--fg); }
.tbl td:first-child { font-weight: 600; color: var(--fg); }
.tbl tr:last-child td { border-bottom: none; }
.yes { color: var(--ok); font-weight: 700; }
.no { color: var(--fg-dim); }

/* Pricing */
.price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.price-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px 26px;
  display: flex; flex-direction: column;
  position: relative; transition: all 0.15s;
}
.price-card.highlighted { border-color: var(--accent); transform: scale(1.03); box-shadow: 0 14px 38px rgba(255,87,34,0.18); }
.price-card.highlighted::before {
  content: '最受欢迎'; position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: var(--accent); color: #fff; padding: 4px 14px; border-radius: 999px;
  font-size: 12px; font-weight: 700;
}
.price-name { font-size: 18px; font-weight: 700; margin-bottom: 6px; }
.price-sub { color: var(--fg-dim); font-size: 13px; margin-bottom: 20px; }
.price-value { font-size: 38px; font-weight: 800; margin-bottom: 6px; }
.price-value .unit { font-size: 15px; color: var(--fg-dim); font-weight: 500; }
.price-desc { color: var(--fg-dim); font-size: 13px; margin-bottom: 24px; }
.price-list { list-style: none; flex: 1; }
.price-list li { padding: 8px 0; color: var(--fg-soft); font-size: 14px; display: flex; gap: 8px; }
.price-list li::before { content: '✓'; color: var(--ok); font-weight: 700; flex-shrink: 0; }
.price-card .btn { margin-top: 24px; }

/* FAQ */
.faq { max-width: 820px; margin: 0 auto; }
.faq-item {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 20px 24px; margin-bottom: 12px;
}
.faq-q { font-weight: 700; margin-bottom: 8px; color: var(--fg); }
.faq-a { color: var(--fg-soft); font-size: 14px; }

/* Contact form */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.form-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px;
}
.form-field { margin-bottom: 18px; }
.form-field label { display: block; font-size: 13px; color: var(--fg-soft); margin-bottom: 6px; font-weight: 600; }
.form-field input, .form-field select, .form-field textarea {
  width: 100%; padding: 12px 14px;
  background: var(--bg-0); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--fg); font-size: 14px;
  font-family: inherit;
}
.form-field input:focus, .form-field select:focus, .form-field textarea:focus {
  outline: none; border-color: var(--accent);
}
.form-field textarea { resize: vertical; min-height: 110px; }
.contact-info {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px;
}
.contact-info h3 { margin-bottom: 14px; }
.contact-info .qr {
  width: 160px; height: 160px; background: var(--bg-0);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  color: var(--fg-dim); font-size: 12px; margin: 16px 0;
}
.contact-row { padding: 10px 0; border-bottom: 1px solid var(--border); font-size: 14px; }
.contact-row:last-child { border-bottom: none; }
.contact-row .label { color: var(--fg-dim); width: 80px; display: inline-block; }

/* Simulator */
.sim-wrap {
  max-width: 1100px; margin: 0 auto; padding: 24px 28px 40px;
  display: grid; grid-template-columns: 1.3fr 1fr; gap: 28px;
}
.sim-dashboard {
  background: radial-gradient(ellipse at center, #1a2030 0%, #0b0d12 100%);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 36px; min-height: 520px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  position: relative;
}
.tacho-svg { width: 100%; max-width: 420px; }
.sim-readout { display: flex; gap: 32px; margin-top: 20px; font-family: 'JetBrains Mono', monospace; }
.sim-readout .val { font-size: 28px; font-weight: 800; color: var(--accent-2); }
.sim-readout .lbl { font-size: 12px; color: var(--fg-dim); text-transform: uppercase; letter-spacing: 1px; }

.sim-controls {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
  display: flex; flex-direction: column; gap: 20px;
}
.sim-controls h3 { margin-bottom: 6px; }
.sim-row { display: flex; flex-direction: column; gap: 6px; }
.sim-row label { font-size: 13px; color: var(--fg-dim); font-weight: 600; text-transform: uppercase; letter-spacing: 0.8px; }
.sim-row input[type='range'] { width: 100%; accent-color: var(--accent); }
.sim-row select {
  background: var(--bg-0); border: 1px solid var(--border);
  color: var(--fg); padding: 10px 12px; border-radius: var(--radius-sm);
  font-family: inherit; font-size: 14px;
}
.gear-buttons { display: flex; gap: 6px; }
.gear-btn {
  flex: 1; padding: 10px;
  background: var(--bg-0); border: 1px solid var(--border);
  color: var(--fg-soft); border-radius: var(--radius-sm);
  font-family: 'JetBrains Mono', monospace; font-weight: 700;
  cursor: pointer; transition: all 0.15s;
}
.gear-btn:hover { border-color: var(--accent); color: var(--fg); }
.gear-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.pedal-row { display: flex; gap: 14px; }
.pedal {
  flex: 1; height: 110px;
  background: var(--bg-0); border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit; font-size: 16px; font-weight: 700;
  color: var(--fg-soft); cursor: pointer;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  user-select: none; -webkit-user-select: none; touch-action: none;
  transition: background 0.06s, border-color 0.06s, transform 0.06s;
  position: relative; overflow: hidden;
}
.pedal:disabled { opacity: 0.4; cursor: not-allowed; }
.pedal .pedal-label { font-size: 12px; color: var(--fg-dim); letter-spacing: 1.2px; text-transform: uppercase; margin-bottom: 4px; }
.pedal .pedal-icon { font-size: 26px; }
.pedal-gas { border-color: rgba(34, 167, 102, 0.45); }
.pedal-gas.pressed { background: linear-gradient(180deg, #2ea76a, #1a7c4d); border-color: #2ea76a; color: #fff; transform: translateY(2px); }
.pedal-brake { border-color: rgba(212, 70, 70, 0.45); }
.pedal-brake.pressed { background: linear-gradient(180deg, #d44646, #9a2929); border-color: #d44646; color: #fff; transform: translateY(2px); }
.sim-start {
  margin-top: 8px; padding: 14px;
  background: var(--accent); color: #fff; border: none;
  border-radius: var(--radius-sm); font-weight: 700; font-size: 15px;
  cursor: pointer; transition: all 0.15s;
}
.sim-start:hover { filter: brightness(1.08); }
.sim-start.stop { background: #444; }
.sim-status { font-size: 13px; color: var(--fg-dim); text-align: center; }

.throttle-indicator {
  position: absolute; bottom: 24px; left: 24px; right: 24px;
  height: 6px; background: var(--bg-0); border-radius: 3px; overflow: hidden;
}
.throttle-fill {
  height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-2));
  width: 0%; transition: width 0.1s;
}

/* Mobile */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { margin: 24px auto 0; }
  .features, .price-grid { grid-template-columns: 1fr; }
  .contact-grid, .sim-wrap { grid-template-columns: 1fr; }
  h1 { font-size: 34px; }
  .nav-links { gap: 14px; font-size: 14px; }
  .nav-links a { font-size: 13px; }
  .nav-cta { display: none; }
}