:root {
  color-scheme: dark;
  --bg: #090a0d;
  --panel: #111319;
  --panel-strong: #171a22;
  --line: #252a35;
  --text: #f2f5f7;
  --muted: #9aa3af;
  --soft: #c9d0d8;
  --red: #ef233c;
  --red-2: #b80f2d;
  --green: #34d399;
  --amber: #f5b84b;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.38);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 20% 0%, rgba(239, 35, 60, 0.18), transparent 28rem),
    linear-gradient(180deg, #0d0f14 0%, var(--bg) 44rem);
  color: var(--text);
  font-family: Inter, "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;
  letter-spacing: 0;
}

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

.site-shell {
  min-height: 100vh;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1rem, 4vw, 4.5rem);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  background: rgba(9, 10, 13, 0.86);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
}

.brand img {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.5rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.nav-links a:hover {
  color: var(--text);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0 1.1rem;
  border: 1px solid transparent;
  border-radius: 0.5rem;
  font-weight: 700;
  cursor: pointer;
}

.button.primary {
  background: linear-gradient(135deg, var(--red), var(--red-2));
  color: white;
  box-shadow: 0 14px 34px rgba(239, 35, 60, 0.28);
}

.button.secondary {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.04);
  color: var(--soft);
}

.button.disabled {
  cursor: not-allowed;
  opacity: 0.68;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(20rem, 0.95fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
  padding: clamp(3rem, 7vw, 6rem) clamp(1rem, 4vw, 4.5rem) 2.5rem;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--red);
  font-size: 0.88rem;
  font-weight: 700;
}

.eyebrow::before {
  content: "";
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 999px;
  background: var(--red);
}

h1 {
  max-width: 13ch;
  margin: 1rem 0 1.25rem;
  font-size: clamp(2.8rem, 7vw, 6.2rem);
  line-height: 0.94;
  letter-spacing: 0;
}

.lead {
  max-width: 42rem;
  margin: 0;
  color: var(--soft);
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.hero-note {
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.product-panel {
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: linear-gradient(180deg, rgba(23, 26, 34, 0.96), rgba(12, 14, 19, 0.96));
  box-shadow: var(--shadow);
  overflow: hidden;
}

.product-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem;
  border-bottom: 1px solid var(--line);
}

.window-dots {
  display: flex;
  gap: 0.35rem;
}

.window-dots span {
  width: 0.65rem;
  height: 0.65rem;
  border-radius: 999px;
  background: #3b424f;
}

.window-dots span:first-child {
  background: var(--red);
}

.status-pill {
  color: var(--green);
  font-size: 0.82rem;
  font-weight: 700;
}

.mock-ui {
  padding: 1rem;
}

.mock-toolbar,
.mock-row,
.mock-log {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.035);
}

.mock-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  padding: 0.85rem;
  border-radius: 0.5rem;
}

.mock-stats {
  display: flex;
  gap: 0.5rem;
}

.mock-stats span {
  padding: 0.35rem 0.55rem;
  border-radius: 0.35rem;
  background: #0b0d12;
  color: var(--muted);
  font-size: 0.75rem;
}

.mock-row {
  display: grid;
  grid-template-columns: 0.8fr 0.7fr 0.7fr 1.3fr;
  gap: 0.75rem;
  margin-top: 0.55rem;
  padding: 0.85rem;
  border-radius: 0.4rem;
  color: var(--soft);
  font-size: 0.86rem;
}

.mock-log {
  margin-top: 0.85rem;
  padding: 0.85rem;
  border-radius: 0.4rem;
  color: var(--muted);
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 0.78rem;
  line-height: 1.8;
}

.section {
  padding: 3rem clamp(1rem, 4vw, 4.5rem);
}

.section h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  letter-spacing: 0;
}

.section-lead {
  max-width: 48rem;
  margin: 0 0 1.6rem;
  color: var(--muted);
  line-height: 1.8;
}

.feature-grid,
.steps,
.price-grid {
  display: grid;
  gap: 1rem;
}

.feature-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card,
.price-card,
.compliance {
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: rgba(17, 19, 25, 0.86);
}

.card {
  padding: 1.15rem;
}

.card h3,
.step h3 {
  margin: 0 0 0.55rem;
  font-size: 1rem;
}

.card p,
.step p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.price-grid {
  grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.48fr);
  align-items: stretch;
}

.price-card {
  padding: 1.5rem;
}

.price {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  margin: 0.5rem 0 1rem;
}

.price strong {
  color: white;
  font-size: clamp(2.5rem, 6vw, 4.5rem);
}

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

.billing-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 1rem 0;
}

.billing-options > div {
  display: grid;
  gap: 0.35rem;
  padding: 0.9rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: rgba(255, 255, 255, 0.035);
}

.billing-options span {
  color: var(--muted);
  font-size: 0.85rem;
}

.billing-options strong {
  color: var(--text);
  font-size: 1.2rem;
}

.billing-options small {
  color: var(--muted);
  line-height: 1.5;
}

.billing-options .featured-plan {
  border-color: rgba(52, 211, 153, 0.55);
  background: rgba(52, 211, 153, 0.08);
}

.plan-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

.included {
  margin: 1.1rem 0 0;
  padding: 0;
  list-style: none;
  color: var(--soft);
}

.included li {
  padding: 0.42rem 0;
}

.steps {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  counter-reset: step;
}

.step {
  counter-increment: step;
  position: relative;
  padding: 1.15rem 1.15rem 1.15rem 3.25rem;
  border-left: 1px solid var(--line);
}

.step::before {
  content: counter(step);
  position: absolute;
  left: 1rem;
  top: 1.15rem;
  display: grid;
  place-items: center;
  width: 1.55rem;
  height: 1.55rem;
  border-radius: 999px;
  background: var(--red);
  color: white;
  font-weight: 800;
  font-size: 0.85rem;
}

.compliance {
  padding: 1rem;
  color: var(--muted);
  line-height: 1.8;
}

.register-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem 1rem;
}

.register-panel {
  width: min(100%, 28rem);
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: rgba(17, 19, 25, 0.94);
  box-shadow: var(--shadow);
}

.register-panel h1 {
  max-width: none;
  margin: 1rem 0 0.75rem;
  font-size: 2.2rem;
  line-height: 1.05;
}

.form-stack {
  display: grid;
  gap: 0.85rem;
  margin-top: 1.2rem;
}

.form-stack label {
  display: grid;
  gap: 0.4rem;
  color: var(--soft);
  font-size: 0.9rem;
}

.form-stack input {
  width: 100%;
  min-height: 2.75rem;
  padding: 0 0.85rem;
  border: 1px solid var(--line);
  border-radius: 0.45rem;
  background: rgba(255, 255, 255, 0.045);
  color: var(--text);
  font: inherit;
}

.form-message {
  min-height: 1.4rem;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.form-message.error {
  color: #fca5a5;
}

.form-message.success {
  color: var(--green);
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 2rem clamp(1rem, 4vw, 4.5rem);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 860px) {
  .hero,
  .price-grid,
  .feature-grid,
  .steps {
    grid-template-columns: 1fr;
  }

  .nav-links {
    display: none;
  }

  .mock-row {
    grid-template-columns: 1fr 1fr;
  }

  .billing-options {
    grid-template-columns: 1fr;
  }

  .footer {
    flex-direction: column;
  }
}