/* ============================================
   Nexus CoreFlow - 产品页样式
   与官网首页保持同一套浅色、卡片化视觉体系
   ============================================ */

:root {
  --bg: #ffffff;
  --bg-secondary: #f8f9fb;
  --bg-tertiary: #f1f3f5;
  --surface: #ffffff;
  --surface-hover: #f8f9fb;
  --text-primary: #0f1419;
  --text-secondary: #536474;
  --text-tertiary: #8b949e;
  --border: #e1e8ed;
  --border-hover: #d1d9de;
  --primary: #7c3aed;
  --primary-hover: #6d28d9;
  --primary-light: #ede9fe;
  --primary-gradient: linear-gradient(135deg, #7c3aed 0%, #3b82f6 100%);
  --primary-gradient-hover: linear-gradient(135deg, #6d28d9 0%, #2563eb 100%);
  --success: #10b981;
  --success-light: #d1fae5;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  --info: #3b82f6;
  --info-light: #dbeafe;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 24px 48px rgba(0, 0, 0, 0.1);
  --font-sans: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --container: 1200px;
  --header-height: 72px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background:
    radial-gradient(circle at 12% 8%, rgba(124, 58, 237, 0.08), transparent 28%),
    radial-gradient(circle at 88% 12%, rgba(59, 130, 246, 0.08), transparent 24%),
    var(--bg);
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--primary-hover);
}

p {
  color: var(--text-secondary);
  line-height: 1.7;
}

h1,
h2,
h3,
h4 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

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

.product-topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-lg);
  min-height: var(--header-height);
  padding: 0 max(var(--space-lg), calc((100vw - var(--container)) / 2 + var(--space-lg)));
  background: rgba(255, 255, 255, 0.84);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}

.brand {
  display: flex;
  align-items: center;
}

.logo-frame {
  display: inline-flex;
  align-items: center;
}

.logo-image {
  display: block;
  width: auto;
  height: 36px;
}

.product-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
}

.product-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 var(--space-md);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
}

.product-nav a:hover,
.product-nav a.is-current {
  color: var(--primary);
  background: var(--primary-light);
}

.topbar-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-sm);
}

.topbar-home,
.topbar-auth,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  min-height: 44px;
  padding: 0 var(--space-lg);
  border: 0;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: all 0.2s ease;
}

.topbar-home,
.topbar-auth,
.button-secondary {
  color: var(--text-primary);
  background: var(--surface);
  border: 1px solid var(--border);
}

.topbar-home:hover,
.topbar-auth:hover,
.button-secondary:hover {
  color: var(--text-primary);
  background: var(--surface-hover);
  border-color: var(--border-hover);
}

.button-primary {
  color: #ffffff;
  background: var(--primary-gradient);
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.25);
}

.button-primary:hover {
  color: #ffffff;
  background: var(--primary-gradient-hover);
  box-shadow: 0 6px 16px rgba(124, 58, 237, 0.3);
  transform: translateY(-1px);
}

.button-disabled,
.button-disabled:hover {
  color: var(--text-tertiary);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  cursor: not-allowed;
  transform: none;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  border-radius: 99px;
  background: var(--text-primary);
}

.section {
  padding: var(--space-4xl) max(var(--space-lg), calc((100vw - var(--container)) / 2 + var(--space-lg)));
}

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

.product-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: var(--space-2xl);
  align-items: center;
  padding-top: var(--space-4xl);
  padding-bottom: var(--space-3xl);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.875rem;
  font-weight: 700;
}

.status-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.status-pill,
.product-code,
.card-label {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
}

.status-pill.open {
  color: #047857;
  background: var(--success-light);
}

.status-pill.soon {
  color: #92400e;
  background: var(--warning-light);
}

.product-code,
.card-label {
  color: var(--text-secondary);
  background: var(--bg-tertiary);
}

.hero-copy h1 {
  max-width: 760px;
  margin-bottom: var(--space-lg);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-text {
  max-width: 720px;
  margin-bottom: var(--space-xl);
  font-size: 1.125rem;
}

.hero-actions,
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
  list-style: none;
}

.hero-tags li {
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  background: var(--surface);
  font-size: 0.875rem;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.hero-panel,
.card,
.feature-card,
.scenario-card,
.timeline-step,
.cta-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.hero-panel {
  padding: var(--space-xl);
}

.hero-panel + .hero-panel {
  margin-top: var(--space-lg);
}

.hero-panel-accent {
  border: 0;
  background:
    linear-gradient(var(--surface), var(--surface)) padding-box,
    var(--primary-gradient) border-box;
  border: 1px solid transparent;
}

.panel-kicker {
  margin-bottom: var(--space-md);
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.metric-grid,
.summary-grid,
.feature-grid,
.scenario-grid,
.timeline-grid {
  display: grid;
  gap: var(--space-lg);
}

.metric-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.metric-grid article,
.summary-card {
  padding: var(--space-lg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
}

.metric-grid strong,
.summary-card strong {
  display: block;
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
  font-size: 1.25rem;
}

.metric-grid span,
.summary-card span {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.deliverable-list {
  display: grid;
  gap: var(--space-sm);
  margin-top: var(--space-md);
  list-style: none;
}

.deliverable-list li {
  position: relative;
  padding-left: 22px;
  color: var(--text-secondary);
}

.deliverable-list li::before {
  content: "";
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 99px;
  background: var(--primary-gradient);
}

.section-heading {
  max-width: 760px;
  margin: 0 auto var(--space-2xl);
  text-align: center;
}

.section-heading h2 {
  margin-bottom: var(--space-md);
  font-size: clamp(2rem, 4vw, 3rem);
}

.summary-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

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

.scenario-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.timeline-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.feature-card,
.scenario-card,
.timeline-step {
  padding: var(--space-lg);
  box-shadow: var(--shadow-md);
  transition: all 0.2s ease;
}

.feature-card:hover,
.scenario-card:hover,
.timeline-step:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.feature-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  margin-bottom: var(--space-md);
  border-radius: var(--radius-md);
  color: #ffffff;
  background: var(--primary-gradient);
  font-size: 0.875rem;
  font-weight: 800;
}

.feature-card h3,
.scenario-card h3,
.timeline-step h4 {
  margin-bottom: var(--space-sm);
  font-size: 1.25rem;
}

.timeline-step {
  position: relative;
}

.timeline-step::before {
  content: "";
  display: block;
  width: 44px;
  height: 4px;
  margin-bottom: var(--space-lg);
  border-radius: 99px;
  background: var(--primary-gradient);
}

.cta-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-xl);
  align-items: center;
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-2xl);
  border: 0;
  background:
    radial-gradient(circle at 12% 12%, rgba(124, 58, 237, 0.12), transparent 28%),
    radial-gradient(circle at 88% 18%, rgba(59, 130, 246, 0.12), transparent 28%),
    var(--surface);
}

.cta-copy h2 {
  margin-bottom: var(--space-md);
  font-size: clamp(1.8rem, 3vw, 2.5rem);
}

.product-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  padding: var(--space-xl) max(var(--space-lg), calc((100vw - var(--container)) / 2 + var(--space-lg)));
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: var(--space-md);
  font-size: 0.875rem;
}

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.56s ease, transform 0.56s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1100px) {
  .product-topbar {
    grid-template-columns: auto auto;
  }

  .menu-toggle {
    display: inline-block;
    justify-self: end;
  }

  .product-nav,
  .topbar-actions {
    grid-column: 1 / -1;
    display: none;
  }

  .product-nav.is-open {
    display: flex;
    justify-content: flex-start;
  }

  .product-nav.is-open + .topbar-actions,
  .product-topbar:has(.product-nav.is-open) .topbar-actions {
    display: flex;
    justify-content: flex-start;
  }

  .product-hero,
  .cta-card {
    grid-template-columns: 1fr;
  }

  .summary-grid,
  .feature-grid,
  .timeline-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  :root {
    --space-4xl: 64px;
  }

  .section {
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
  }

  .product-topbar {
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
  }

  .hero-actions .button,
  .cta-actions .button,
  .topbar-actions a {
    width: 100%;
  }

  .metric-grid,
  .summary-grid,
  .feature-grid,
  .scenario-grid,
  .timeline-grid {
    grid-template-columns: 1fr;
  }

  .product-footer {
    flex-direction: column;
    align-items: flex-start;
  }
}