:root {
  --bg: #020617;
  --primary: #4f8bff;
  --accent: #a855ff;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --radius-lg: 18px;
  --radius-xl: 26px;
  --shadow-soft: 0 26px 70px rgba(15, 23, 42, 0.9);
  --border-subtle: 1px solid rgba(148, 163, 184, 0.2);
  --transition: 180ms ease-out;
  --content-width: 1200px;
  --content-padding: clamp(18px, 5vw, 28px);
  --nav-height: 84px;
}

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

html,
body {
  height: 100%;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at top left, #1f2937 0, #020617 40%, #000 100%);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

body {
  display: flex;
  flex-direction: column;
  padding-top: var(--nav-height);
}

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

main {
  flex: 1;
}

.nav-inner,
.hero-inner,
.section,
.cta,
.footer-inner {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
}

section {
  width: 100%;
}

/* 顶部导航：全宽 + 固定 */
.nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  backdrop-filter: blur(22px);
  background: linear-gradient(
    to right,
    rgba(15, 23, 42, 0.9),
    rgba(15, 23, 42, 0.75),
    rgba(15, 23, 42, 0.9)
  );
  border-bottom: 1px solid rgba(148, 163, 184, 0.25);
  min-height: var(--nav-height);
}

.nav-inner {
  padding: 16px var(--content-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-mark {
  width: 36px;
  height: 36px;
  border-radius: 999px;
  background: conic-gradient(
    from 210deg,
    #4f46e5,
    #22c1c3,
    #a855ff,
    #4f46e5
  );
  padding: 2px;
  box-shadow: 0 0 24px rgba(79, 70, 229, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-inner {
  width: 100%;
  height: 100%;
  border-radius: inherit;
  background: radial-gradient(circle at 30% 0, #0f172a, #020617);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #e5f0ff;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-text span:first-child {
  font-size: 18px;
  font-weight: 600;
}

.brand-text span:last-child {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 14px;
  color: var(--muted);
}

.nav-link {
  padding: 6px 10px;
  border-radius: 999px;
  transition: background var(--transition), color var(--transition),
    transform var(--transition);
  cursor: pointer;
}

.nav-link:hover {
  background: rgba(148, 163, 184, 0.14);
  color: #f9fafb;
  transform: translateY(-1px);
}

.btn-primary {
  padding: 8px 18px;
  border-radius: 999px;
  border: none;
  outline: none;
  cursor: pointer;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  font-size: 13px;
  font-weight: 500;
  box-shadow: 0 16px 40px rgba(37, 99, 235, 0.7);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: transform 160ms ease-out, box-shadow 160ms ease-out;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 22px 55px rgba(37, 99, 235, 0.9);
}

.btn-primary .arrow {
  font-size: 16px;
  transform: translateY(1px);
}

.btn-ghost {
  padding: 8px 16px;
  border-radius: 999px;
  border: var(--border-subtle);
  background: rgba(15, 23, 42, 0.8);
  font-size: 13px;
  color: var(--muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background var(--transition), color var(--transition),
    border-color var(--transition), transform var(--transition);
}

.btn-ghost:hover {
  background: rgba(30, 64, 175, 0.7);
  color: #f9fafb;
  border-color: rgba(129, 140, 248, 0.95);
  transform: translateY(-1px);
}

/* Hero：高度更高、左右大版面 */
.hero {
  position: relative;
  padding: 72px 0 72px;
  overflow: hidden;
}

.hero-bg-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 0% 0%, rgba(56, 189, 248, 0.25), transparent 55%),
    radial-gradient(circle at 100% 0%, rgba(168, 85, 247, 0.35), transparent 60%),
    radial-gradient(circle at 50% 100%, rgba(15, 23, 42, 0.9), #020617 78%);
  opacity: 0.98;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  padding: 0 var(--content-padding);
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: 56px;
  align-items: center;
}

.hero-left {
  max-width: 640px;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px 4px 4px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.4);
  background: radial-gradient(circle at left, rgba(59, 130, 246, 0.35), transparent);
  color: var(--muted);
  font-size: 11px;
  margin-bottom: 18px;
}

.hero-kicker-dot {
  width: 20px;
  height: 20px;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 0, #4f46e5, #22c1c3);
  box-shadow: 0 0 20px rgba(96, 165, 250, 0.95);
}

.hero-title {
  font-size: clamp(34px, 4.8vw, 46px);
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-bottom: 16px;
}

.hero-title span {
  background: linear-gradient(120deg, #60a5fa, #a855ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-subtitle {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.8;
  max-width: 540px;
  margin-bottom: 22px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  margin-bottom: 22px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 12px;
  color: var(--muted);
}

.hero-meta-item .value {
  font-size: 15px;
  font-weight: 600;
  color: #f9fafb;
  display: block;
}

/* Hero 右侧卡片 */
.hero-right {
  display: flex;
  justify-content: flex-end;
  width: 100%;
}

.hero-card {
  position: relative;
  width: 100%;
  max-width: 380px;
  border-radius: var(--radius-xl);
  padding: 20px 18px;
  min-height: 260px;
  background:
    radial-gradient(circle at 0 0, rgba(59, 130, 246, 0.3), transparent 60%),
    radial-gradient(circle at 110% 15%, rgba(168, 85, 247, 0.45), transparent 60%),
    linear-gradient(145deg, #020617, #020617 40%, #020617);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  border: 1px solid rgba(148, 163, 184, 0.6);
}

.hero-card-glow {
  position: absolute;
  inset: -140px;
  background:
    radial-gradient(circle at 12% 0, rgba(59, 130, 246, 0.6), transparent 60%),
    radial-gradient(circle at 86% 8%, rgba(168, 85, 247, 0.7), transparent 65%);
  opacity: 0.7;
  mix-blend-mode: screen;
  pointer-events: none;
}

.hero-card-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 16px;
}

.hero-data-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.86);
  border: 1px solid rgba(148, 163, 184, 0.7);
  font-size: 11px;
  color: var(--muted);
  align-self: flex-start;
}

.hero-data-dot {
  width: 9px;
  height: 9px;
  border-radius: 999px;
  background: #4ade80;
  box-shadow: 0 0 16px rgba(74, 222, 128, 0.8);
}

.hero-metric-row {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  font-size: 11px;
  color: var(--muted);
}

.hero-metric-row strong {
  display: block;
  font-size: 20px;
  color: #f9fafb;
}

.hero-chart-bar {
  margin-top: 8px;
  height: 7px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.9);
  overflow: hidden;
}

.hero-chart-bar span {
  display: block;
  height: 100%;
  width: 76%;
  background: linear-gradient(90deg, #38bdf8, #6366f1, #a855ff);
  box-shadow: 0 0 18px rgba(96, 165, 250, 0.9);
}

.hero-mini-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 10px;
}

.hero-mini-card {
  border-radius: 16px;
  padding: 8px 9px 9px;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.6);
  font-size: 11px;
  color: var(--muted);
}

.hero-mini-card .val {
  display: block;
  margin-top: 5px;
  font-size: 15px;
  font-weight: 600;
  color: #f9fafb;
}

/* 通用 section 布局 */
.section {
  padding: 52px var(--content-padding) 0;
}

.section-narrow {
  max-width: 100%;
  width: 100%;
  padding-inline: 0;
}

.section-header {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-end;
  margin-bottom: 22px;
}

.section-title {
  font-size: 22px;
  font-weight: 600;
}

.section-subtitle {
  font-size: 14px;
  color: var(--muted);
  max-width: 460px;
  line-height: 1.7;
}

/* 合作 AI 产品 */
.partners {
  padding: 18px 18px 16px;
  border-radius: var(--radius-lg);
  border: var(--border-subtle);
  background:
    radial-gradient(circle at 0 0, rgba(79, 70, 229, 0.4), transparent 55%),
    radial-gradient(circle at 100% 0, rgba(8, 47, 73, 0.7), transparent 60%),
    rgba(15, 23, 42, 0.92);
  box-shadow: 0 18px 48px rgba(15, 23, 42, 0.9);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.partners-header {
  font-size: 12px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.partners-title {
  color: #e5e7eb;
  font-weight: 500;
}

.partners-row {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  align-items: center;
}

.partner-logo {
  height: 28px;
  width: 103px;
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  gap: 8px;
  filter: drop-shadow(0 0 6px rgba(15, 23, 42, 0.9));
}

.partner-icon {
  width: 18px;
  height: 18px;
  border-radius: 999px;
  border: 1.3px solid rgba(248, 250, 252, 0.96);
}

.partner-text {
  font-size: 13px;
  color: #ffffff;
  font-weight: 500;
  letter-spacing: 0.03em;
}

.partner-text.en {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* 典型场景 */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.scenario-card {
  border-radius: 20px;
  padding: 16px 16px 18px;
  background: rgba(15, 23, 42, 0.94);
  border: 1px solid rgba(148, 163, 184, 0.4);
  box-shadow: 0 18px 38px rgba(15, 23, 42, 0.85);
  font-size: 13px;
  color: var(--muted);
  line-height: 1.7;
}

.scenario-tag {
  display: inline-flex;
  padding: 2px 9px;
  border-radius: 999px;
  font-size: 11px;
  background: rgba(37, 99, 235, 0.2);
  color: #bfdbfe;
  margin-bottom: 8px;
}

.scenario-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
  color: #e5e7eb;
}

.scenario-metric {
  margin-top: 10px;
  font-size: 12px;
  color: #9ca3af;
}

.scenario-metric strong {
  color: #e5e7eb;
}

/* 能力矩阵 */
.capabilities {
  border-radius: 22px;
  padding: 20px 18px 18px;
  background: rgba(15, 23, 42, 0.97);
  border: 1px solid rgba(148, 163, 184, 0.55);
  box-shadow: 0 24px 60px rgba(15, 23, 42, 0.95);
  margin-top: 6px;
}

.cap-row {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  gap: 18px;
  font-size: 13px;
  padding: 10px 0;
  border-bottom: 1px dashed rgba(55, 65, 81, 0.9);
}

.cap-row:last-child {
  border-bottom: none;
}

.cap-label {
  color: #9ca3af;
  font-weight: 500;
}

.cap-value {
  color: #e5e7eb;
  line-height: 1.7;
}

.cap-badges {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 6px;
}

.cap-badge {
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  background: rgba(15, 23, 42, 0.95);
  border: 1px solid rgba(148, 163, 184, 0.7);
  color: #cbd5f5;
}

/* 集成流程 */
.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 10px;
  font-size: 12px;
}

.step {
  border-radius: 16px;
  padding: 12px 11px 14px;
  background: rgba(15, 23, 42, 0.94);
  border: 1px solid rgba(148, 163, 184, 0.5);
  line-height: 1.7;
}

.step-index {
  font-size: 11px;
  color: #9ca3af;
  margin-bottom: 4px;
}

.step-title {
  font-size: 14px;
  font-weight: 600;
  color: #e5e7eb;
  margin-bottom: 4px;
}

/* FAQ */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 10px;
}

.faq-item {
  border-radius: 18px;
  padding: 13px 14px 14px;
  background: rgba(15, 23, 42, 0.96);
  border: 1px solid rgba(148, 163, 184, 0.55);
  font-size: 13px;
  color: var(--muted);
  line-height: 1.7;
}

.faq-q {
  font-weight: 600;
  font-size: 14px;
  color: #e5e7eb;
  margin-bottom: 6px;
}

/* CTA 大版块 */
.cta-section {
  padding: 52px var(--content-padding) 60px;
}

.cta {
  width: 100%;
  padding: 24px clamp(16px, 4vw, 24px);
  border-radius: 26px;
  background:
    radial-gradient(circle at 0 0, rgba(56, 189, 248, 0.35), transparent 55%),
    radial-gradient(circle at 100% 0, rgba(168, 85, 247, 0.55), transparent 60%),
    linear-gradient(135deg, #111827, #020617);
  border: 1px solid rgba(129, 140, 248, 0.9);
  box-shadow: 0 32px 80px rgba(37, 99, 235, 0.9);
  display: flex;
  justify-content: space-between;
  gap: 22px;
  align-items: center;
  flex-wrap: wrap;
}

.cta-left {
  max-width: 540px;
}

.cta-title {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 6px;
}

.cta-desc {
  font-size: 14px;
  color: #e5e7eb;
  line-height: 1.8;
}

.cta-right {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}

.cta-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.cta-note {
  font-size: 12px;
  color: #e5e7eb;
}

/* 页脚 */
footer {
  border-top: 1px solid rgba(148, 163, 184, 0.24);
  padding: 14px 0 22px;
  font-size: 12px;
  color: var(--muted);
  background: radial-gradient(circle at 50% 0, rgba(37, 99, 235, 0.22), transparent),
    #020617;
}

.footer-inner {
  padding: 0 var(--content-padding);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

/* 响应式 */
@media (max-width: 960px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 40px;
  }
  .hero-right {
    justify-content: flex-start;
  }
  .hero-card {
    max-width: 100%;
  }
  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .scenarios-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  :root {
    --content-padding: 18px;
    --nav-height: 70px;
  }
  .nav-right {
    display: none;
  }
  .hero {
    padding: 56px 0 48px;
  }
  .hero-card {
    max-width: 100%;
  }
  .scenarios-grid {
    grid-template-columns: minmax(0, 1fr);
  }
  .faq-grid {
    grid-template-columns: minmax(0, 1fr);
  }
  .cta-section {
    padding-bottom: 40px;
  }
}
/* 404 页面 */

.error-hero {
  position: relative;
  padding: 96px 0 96px;
  overflow: hidden;
}

.error-bg-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 10% 0, rgba(56, 189, 248, 0.35), transparent 55%),
    radial-gradient(circle at 90% 0, rgba(168, 85, 247, 0.5), transparent 60%),
    radial-gradient(circle at 50% 100%, rgba(15, 23, 42, 0.95), #020617 78%);
  opacity: 0.98;
  pointer-events: none;
}

.error-inner {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
  padding: 0 28px;
  text-align: center;
}

.error-code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 88px;
  height: 88px;
  border-radius: 999px;
  border: 2px solid rgba(148, 163, 184, 0.7);
  box-shadow: 0 24px 70px rgba(15, 23, 42, 0.9);
  background:
    radial-gradient(circle at 30% 0, rgba(59, 130, 246, 0.6), transparent 60%),
    rgba(15, 23, 42, 0.96);
  font-size: 36px;
  font-weight: 700;
  letter-spacing: 0.12em;
  margin: 0 auto 18px;
}

.error-title {
  font-size: clamp(26px, 3.2vw, 32px);
  font-weight: 600;
  margin-bottom: 14px;
}

.error-subtitle {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.8;
  margin-bottom: 24px;
}

.error-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 18px;
}

.error-meta {
  font-size: 12px;
  color: var(--muted);
}

/* 小屏适配 */
@media (max-width: 720px) {
  .error-inner {
    padding-inline: 18px;
  }
}