:root {
  color-scheme: dark;
  --bg: #07070b;
  --bg-alt: #0f1117;
  --card: #151823;
  --text: #eef1f8;
  --muted: #98a0b3;
  --primary: #4f7cff;
  --primary-strong: #6a8bff;
  --border: rgba(255, 255, 255, 0.08);
  --shadow: 0 20px 60px rgba(8, 10, 20, 0.55);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
}

body {
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

.hero {
  padding: 40px 80px 100px;
  background: radial-gradient(circle at 20% 10%, rgba(79, 124, 255, 0.35), transparent 55%),
    radial-gradient(circle at 80% 0%, rgba(130, 80, 255, 0.3), transparent 50%),
    var(--bg);
  min-height: 100vh;
}

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

.logo {
  font-weight: 700;
  font-size: 20px;
}

.nav-links {
  display: flex;
  gap: 24px;
  color: var(--muted);
  font-size: 14px;
}

.primary-btn,
.ghost-btn {
  border: none;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
}

.primary-btn {
  background: linear-gradient(120deg, var(--primary), var(--primary-strong));
  color: #fff;
  box-shadow: 0 8px 25px rgba(79, 124, 255, 0.35);
}

.primary-btn.full {
  width: 100%;
}

.ghost-btn {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
}

.hero-content {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 60px;
  margin-top: 80px;
  align-items: center;
}

.badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(79, 124, 255, 0.15);
  color: var(--primary-strong);
  font-size: 13px;
  margin-bottom: 20px;
}

.hero-text h1 {
  font-size: 48px;
  line-height: 1.2;
  margin-bottom: 20px;
}

.subtitle {
  color: var(--muted);
  max-width: 560px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin: 30px 0 40px;
}

.hero-meta {
  display: flex;
  gap: 40px;
}

.metric {
  font-size: 22px;
  font-weight: 700;
}

.metric-label {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.hero-card {
  background: var(--card);
  padding: 28px;
  border-radius: 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.status {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--primary-strong);
  font-size: 14px;
  margin-bottom: 18px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--primary-strong);
  box-shadow: 0 0 16px rgba(79, 124, 255, 0.9);
}

.wave {
  display: flex;
  gap: 6px;
  align-items: flex-end;
  height: 120px;
  margin-bottom: 20px;
}

.wave .bar {
  width: 10px;
  height: 40px;
  border-radius: 6px;
  background: linear-gradient(180deg, rgba(79, 124, 255, 0.9), rgba(79, 124, 255, 0.15));
  animation: wave 1.4s infinite ease-in-out;
}

.wave .bar:nth-child(2) {
  animation-delay: 0.2s;
}
.wave .bar:nth-child(3) {
  animation-delay: 0.4s;
}
.wave .bar:nth-child(4) {
  animation-delay: 0.6s;
}
.wave .bar:nth-child(5) {
  animation-delay: 0.8s;
}
.wave .bar:nth-child(6) {
  animation-delay: 1s;
}

@keyframes wave {
  0%,
  100% {
    height: 30px;
  }
  50% {
    height: 100px;
  }
}

.panel {
  background: rgba(255, 255, 255, 0.03);
  padding: 16px;
  border-radius: 16px;
  margin-bottom: 20px;
}

.panel-row {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 10px;
}

.panel-row .value {
  color: var(--text);
  font-weight: 600;
}

.section {
  padding: 90px 80px;
}

.section.alt {
  background: var(--bg-alt);
}

.section-title {
  max-width: 780px;
  margin-bottom: 50px;
}

.eyebrow {
  color: var(--primary-strong);
  font-size: 13px;
  margin-bottom: 12px;
  letter-spacing: 0.08em;
}

.section-title h2 {
  font-size: 32px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--card);
  padding: 24px;
  border-radius: 18px;
  border: 1px solid var(--border);
}

.feature-card h3 {
  margin-bottom: 12px;
}

.tab-header {
  display: inline-flex;
  gap: 12px;
  background: rgba(255, 255, 255, 0.04);
  padding: 6px;
  border-radius: 999px;
}

.tab-btn {
  border: none;
  background: transparent;
  color: var(--muted);
  padding: 10px 18px;
  border-radius: 999px;
  cursor: pointer;
}

.tab-btn.active {
  background: rgba(79, 124, 255, 0.2);
  color: var(--text);
}

.tab-content {
  display: none;
  margin-top: 30px;
}

.tab-content.active {
  display: block;
}

.tab-card {
  background: var(--card);
  padding: 30px;
  border-radius: 18px;
  border: 1px solid var(--border);
}

.steps {
  display: flex;
  gap: 24px;
  margin: 20px 0 10px;
}

.step {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
}

.step-index {
  width: 28px;
  height: 28px;
  border-radius: 999px;
  background: rgba(79, 124, 255, 0.25);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
  font-weight: 600;
}

.param-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.param-card {
  background: var(--card);
  padding: 24px;
  border-radius: 18px;
  border: 1px solid var(--border);
}

.param-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 12px;
}

.range {
  color: var(--muted);
}

input[type="range"] {
  width: 100%;
  margin-bottom: 12px;
}

.emotion-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 12px;
}

.chip {
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.chip.active {
  background: rgba(79, 124, 255, 0.25);
  color: var(--text);
}

.muted {
  color: var(--muted);
}

.echo-panel {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 40px;
  background: var(--card);
  padding: 30px;
  border-radius: 18px;
  border: 1px solid var(--border);
}

.toggle {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
}

.switch {
  width: 52px;
  height: 28px;
  border-radius: 999px;
  border: none;
  background: rgba(255, 255, 255, 0.1);
  position: relative;
  cursor: pointer;
}

.switch .knob {
  position: absolute;
  top: 4px;
  left: 4px;
  width: 20px;
  height: 20px;
  border-radius: 999px;
  background: #fff;
  transition: all 0.25s ease;
}

.switch.active {
  background: rgba(79, 124, 255, 0.4);
}

.switch.active .knob {
  left: 28px;
}

.cta {
  padding: 80px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: linear-gradient(120deg, rgba(79, 124, 255, 0.2), rgba(130, 80, 255, 0.2));
}

.footer {
  padding: 30px 80px;
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--border);
  color: var(--muted);
}

.footer-links {
  display: flex;
  gap: 20px;
}

@media (max-width: 1024px) {
  .hero {
    padding: 30px 24px 80px;
  }

  .section,
  .cta,
  .footer {
    padding: 70px 24px;
  }

  .hero-content {
    grid-template-columns: 1fr;
  }

  .feature-grid,
  .param-grid {
    grid-template-columns: 1fr;
  }

  .echo-panel {
    flex-direction: column;
    align-items: flex-start;
  }

  .cta {
    flex-direction: column;
    gap: 24px;
    align-items: flex-start;
  }
}