* {
  box-sizing: border-box;
}

:root {
  --bg: #050507;
  --bg-soft: #0b0b10;
  --panel: rgba(14, 14, 18, 0.72);
  --panel-strong: #101115;
  --line: rgba(255, 255, 255, 0.05);
  --line-strong: rgba(96, 165, 250, 0.16);
  --text: #f5f7fb;
  --text-soft: #c7cfdd;
  --text-muted: #8b94a7;
  --primary: #60a5fa;
  --primary-deep: #2563eb;
  --shadow-soft: 0 18px 40px rgba(0, 0, 0, 0.28);
  --shadow-card: 0 20px 48px rgba(0, 0, 0, 0.32);
  --radius-lg: 18px;
  --radius-md: 14px;
  --radius-sm: 10px;
}

html,
body {
  margin: 0;
  padding: 0;
  min-width: 320px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top center, rgba(59, 130, 246, 0.08), transparent 26%),
    linear-gradient(180deg, #020203 0%, var(--bg) 42%, #030304 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at top center, rgba(255, 255, 255, 0.03), transparent 52%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 72%);
}

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

img {
  display: block;
  max-width: 100%;
}

.site-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-main {
  flex: 1;
  padding-top: 104px;
  padding-bottom: 48px;
}

.site-container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 28px;
}

.site-header {
  position: fixed;
  top: 16px;
  right: 0;
  left: 0;
  z-index: 100;
}

.site-header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 12px 18px;
  border-radius: 20px;
  background: rgba(10, 10, 13, 0.66);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(16px);
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.site-brand-logo {
  width: 46px;
  height: 46px;
  padding: 7px;
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(22, 22, 28, 0.98) 0%, rgba(10, 10, 14, 0.98) 100%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

.site-brand-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.site-brand-text {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.site-brand-text strong {
  font-size: 16px;
  line-height: 1.2;
  font-weight: 700;
  color: var(--text);
}

.site-brand-text span {
  font-size: 12px;
  color: var(--text-muted);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 10px;
}

.site-nav-link {
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-soft);
  transition: color 0.2s ease, opacity 0.2s ease;
}

.site-nav-link:hover,
.site-nav-link.is-active {
  color: var(--primary);
  opacity: 1;
}

.page-section {
  margin: 34px 0;
}

.hero-panel,
.simple-card {
  position: relative;
  background: var(--panel);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(14px);
}

.hero-panel {
  overflow: hidden;
  padding: 56px;
}

.hero-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at top left, rgba(59, 130, 246, 0.12), transparent 28%),
    linear-gradient(135deg, rgba(59, 130, 246, 0.04), rgba(255, 255, 255, 0) 46%);
  pointer-events: none;
}

.hero-main {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  max-width: 760px;
}

.hero-version,
.page-badge,
.section-number,
.feature-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 32px;
  padding: 0 12px;
  border-radius: 999px;
  background: rgba(96, 165, 250, 0.08);
  color: #93c5fd;
  font-size: 13px;
  font-weight: 600;
}

.hero-title,
.page-title {
  margin: 18px 0 14px;
  max-width: 760px;
  font-size: 58px;
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--text);
}

.hero-text,
.page-text,
.card-text,
.faq-answer {
  margin: 0;
  color: var(--text-soft);
  font-size: 15px;
  line-height: 1.85;
}

.page-lead {
  max-width: 780px;
}

.hero-text {
  max-width: 650px;
  font-size: 18px;
}

.hero-actions {
  margin-top: 28px;
}

.primary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 132px;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 12px;
  background: linear-gradient(180deg, #93c5fd 0%, #3b82f6 100%);
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  box-shadow: 0 10px 24px rgba(37, 99, 235, 0.22);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.primary-button:hover {
  transform: translateY(-1px);
  background: linear-gradient(180deg, #bfdbfe 0%, #60a5fa 100%);
  box-shadow: 0 14px 28px rgba(37, 99, 235, 0.28);
}

.section-title {
  margin: 0;
  font-size: 32px;
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.section-text,
.section-summary {
  margin: 0;
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.8;
}

.content-block-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 22px;
}

.section-kicker {
  margin-bottom: 10px;
  color: #93c5fd;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.info-grid,
.two-column-grid {
  display: grid;
  gap: 18px;
}

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

.feature-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.9fr);
  gap: 18px;
}

.feature-spotlight {
  position: relative;
  overflow: hidden;
  padding: 34px;
  border-radius: 26px;
  background:
    radial-gradient(circle at top right, rgba(96, 165, 250, 0.14), transparent 28%),
    linear-gradient(180deg, rgba(15, 15, 20, 0.92) 0%, rgba(10, 10, 14, 0.94) 100%);
  box-shadow: 0 24px 54px rgba(0, 0, 0, 0.34);
}

.feature-spotlight-title {
  margin: 22px 0 12px;
  font-size: 34px;
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
}

.feature-spotlight-text {
  margin: 0;
  max-width: 540px;
  color: var(--text-soft);
  font-size: 16px;
  line-height: 1.9;
}

.feature-mini-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.feature-mini-item {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-soft);
  font-size: 14px;
}

.feature-stack {
  display: grid;
  gap: 18px;
}

.feature-card--compact {
  min-height: 0;
}

.feature-card-top {
  margin-bottom: 18px;
}

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

.simple-card {
  padding: 28px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.simple-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 22px 44px rgba(0, 0, 0, 0.38);
  background: rgba(16, 16, 21, 0.82);
}

.feature-card {
  overflow: hidden;
  background: rgba(15, 15, 20, 0.78);
}

.feature-tag {
  margin-bottom: 16px;
}

.card-title,
.faq-question {
  margin: 0 0 10px;
  font-size: 20px;
  line-height: 1.35;
  font-weight: 700;
  color: var(--text);
}

.faq-card {
  padding-bottom: 12px;
}

.faq-layout {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.faq-side {
  padding-top: 6px;
}

.faq-panel {
  padding: 30px 32px;
  border-radius: 24px;
  background: rgba(14, 14, 18, 0.72);
  box-shadow: var(--shadow-card);
}

.faq-list,
.tag-list,
.stack-list,
.text-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  padding: 0 0 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.faq-item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.tag-item {
  padding: 14px 16px;
  border-radius: 12px;
  background: rgba(17, 18, 24, 0.82);
  color: var(--text-soft);
  font-size: 14px;
  line-height: 1.7;
}

.content-card,
.page-hero-card {
  background: rgba(12, 12, 16, 0.76);
}

.page-intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 24px;
  align-items: end;
}

.page-intro-main {
  max-width: 760px;
}

.page-intro-side {
  padding: 24px;
  border-radius: 22px;
  background: rgba(14, 14, 18, 0.68);
  box-shadow: var(--shadow-soft);
}

.intro-side-label {
  margin-bottom: 12px;
  color: #93c5fd;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.intro-side-value {
  color: var(--text);
  font-size: 18px;
  line-height: 1.6;
  font-weight: 600;
}

.content-split-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 30px;
  align-items: start;
}

.content-copy-block {
  max-width: 760px;
  padding-top: 8px;
}

.content-list-panel {
  padding: 28px;
  border-radius: 24px;
  background: rgba(14, 14, 18, 0.72);
  box-shadow: var(--shadow-card);
}

.content-list-title {
  margin: 0 0 16px;
  color: var(--text);
  font-size: 22px;
  line-height: 1.3;
  font-weight: 700;
}

.statement-panel {
  max-width: 860px;
  padding: 34px 0 0;
}

.statement-text {
  margin: 0;
  color: var(--text);
  font-size: 28px;
  line-height: 1.55;
  letter-spacing: -0.02em;
}

.terms-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.terms-card {
  min-height: 220px;
  padding: 30px;
  border-radius: 24px;
  background: rgba(14, 14, 18, 0.72);
  box-shadow: var(--shadow-card);
}

.terms-card--contact {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.inline-link {
  color: var(--primary);
  font-weight: 600;
}

.inline-link:hover {
  text-decoration: underline;
}

.site-footer {
  padding-bottom: 28px;
}

.site-footer-text {
  margin: 16px 0 0;
  padding: 20px 0 0;
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

@media (max-width: 920px) {
  .feature-layout,
  .faq-layout,
  .page-intro-grid,
  .content-split-layout,
  .terms-grid,
  .two-column-grid,
  .info-grid {
    grid-template-columns: 1fr;
  }

  .content-block-head {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 768px) {
  .site-main {
    padding-top: 126px;
    padding-bottom: 24px;
  }

  .site-container {
    padding: 0 16px;
  }

  .site-header {
    top: 12px;
  }

  .site-header-inner {
    min-height: auto;
    padding: 14px;
    flex-direction: column;
    align-items: flex-start;
  }

  .site-nav {
    width: 100%;
    flex-wrap: wrap;
  }

  .site-nav-link {
    padding: 8px 12px;
  }

  .hero-panel,
  .simple-card {
    padding: 20px;
  }

  .feature-spotlight,
  .faq-panel,
  .content-list-panel,
  .page-intro-side,
  .terms-card {
    padding: 20px;
  }

  .hero-title,
  .page-title {
    font-size: 38px;
  }

  .hero-text {
    font-size: 16px;
  }

  .section-title {
    font-size: 28px;
  }

  .feature-spotlight-title {
    font-size: 28px;
  }

  .statement-text {
    font-size: 22px;
  }
}