* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: var(--viewport-min);
  color: var(--color-text);
  font-family: var(--font-family-mobile);
  background:
    radial-gradient(circle at top left, rgba(248, 58, 58, 0.18), transparent 24%),
    radial-gradient(circle at 90% 10%, rgba(63, 123, 255, 0.14), transparent 22%),
    linear-gradient(180deg, #f7f3ef 0%, #f4f6fb 38%, #edf1f8 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.3;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.55) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.8), transparent 90%);
}

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

.page-shell {
  width: min(100%, var(--layout-max-width));
  margin: 0 auto;
  padding: clamp(18px, 4vw, 36px) var(--page-padding-x-fluid) calc(56px + var(--safe-area-bottom));
}

.hero,
.section-card {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(32, 42, 67, 0.08);
  border-radius: clamp(24px, 3vw, 36px);
  box-shadow: 0 24px 70px rgba(32, 42, 67, 0.08);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: clamp(18px, 4vw, 36px);
  padding: clamp(24px, 5vw, 42px);
  background:
    linear-gradient(135deg, rgba(11, 28, 51, 0.96), rgba(35, 59, 96, 0.88)),
    linear-gradient(180deg, rgba(248, 58, 58, 0.16), rgba(255, 255, 255, 0));
  color: #f5f7fb;
}

.hero::after,
.section-card::after {
  content: "";
  position: absolute;
  inset: auto -10% -40% auto;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(248, 58, 58, 0.18), transparent 70%);
}

.hero-kicker,
.section-kicker,
.card-label {
  margin: 0 0 10px;
  font-size: 12px;
  font-weight: var(--font-semibold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-kicker {
  color: #ffb7a7;
}

.hero-copy h1 {
  margin: 0;
  max-width: 12ch;
  font-size: clamp(34px, 5vw, 60px);
  line-height: 1.08;
}

.hero-desc {
  max-width: 52ch;
  margin: var(--space-4) 0 0;
  color: rgba(245, 247, 251, 0.82);
  font-size: var(--text-body);
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: var(--space-5);
}

.primary-link,
.ghost-link {
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: var(--font-semibold);
}

.primary-link {
  background: linear-gradient(135deg, #ff875f, #f84747);
  color: #fff;
}

.ghost-link {
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.06);
  color: #eef3ff;
}

.hero-panel {
  display: grid;
  align-content: start;
  gap: 18px;
  padding: 20px;
  border-radius: 28px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.06));
  backdrop-filter: blur(10px);
}

.panel-tag {
  width: fit-content;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  color: #ffd1c6;
  font-size: 12px;
  font-weight: var(--font-semibold);
}

.panel-flow,
.chip-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.panel-flow span,
.chip-grid span,
.quick-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0 14px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: var(--font-medium);
}

.panel-flow span {
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.08);
  color: #f4f6fb;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.hero-metrics div {
  padding: 14px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.08);
}

.hero-metrics strong {
  display: block;
  font-size: 28px;
  line-height: 1;
}

.hero-metrics span {
  display: block;
  margin-top: 8px;
  color: rgba(245, 247, 251, 0.76);
  font-size: 12px;
}

.quick-nav {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 16px 0 0;
  margin-bottom: 18px;
}

.quick-nav a {
  border: 1px solid rgba(32, 42, 67, 0.08);
  background: rgba(255, 255, 255, 0.76);
  color: var(--color-text);
  backdrop-filter: blur(10px);
}

.content-stack {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.section-card {
  padding: clamp(20px, 4vw, 32px);
  background: rgba(255, 255, 255, 0.88);
}

.section-heading {
  margin-bottom: clamp(18px, 3vw, 24px);
}

.section-kicker {
  color: var(--color-brand);
}

.section-heading h2 {
  margin: 0;
  max-width: 18ch;
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1.12;
}

.overview-grid,
.duo-grid,
.mapping-grid,
.schema-layout,
.quality-grid,
.triple-grid {
  display: grid;
  gap: 16px;
}

.overview-grid,
.duo-grid,
.mapping-grid,
.schema-layout {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

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

.info-card,
.schema-card,
.stack-card,
.quality-item,
.phase-card {
  position: relative;
  border: 1px solid rgba(32, 42, 67, 0.08);
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(246, 248, 253, 0.9));
}

.info-card,
.schema-card,
.stack-card,
.quality-item {
  padding: clamp(18px, 3vw, 24px);
}

.spotlight {
  background:
    radial-gradient(circle at top right, rgba(248, 58, 58, 0.12), transparent 28%),
    linear-gradient(180deg, #fffdfb, #fff5f2);
}

.card-label {
  color: var(--color-brand);
}

.info-card h3,
.schema-card h3,
.stack-card h3 {
  margin: 0 0 10px;
  font-size: 22px;
  line-height: 1.25;
}

.info-card p,
.schema-card p,
.stack-card p,
.quality-item p {
  margin: 0;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.plain-list {
  margin: 0;
  padding-left: 18px;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.muted-copy {
  margin-top: 14px !important;
}

.phase-stack {
  display: grid;
  gap: 14px;
}

.phase-card {
  display: grid;
  grid-template-columns: 90px minmax(0, 1fr) minmax(180px, 240px);
  gap: 16px;
  align-items: center;
  padding: 18px 20px;
}

.phase-card h3 {
  margin: 0 0 8px;
  font-size: 20px;
}

.phase-card p,
.phase-note {
  margin: 0;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.phase-no {
  width: fit-content;
  padding: 10px 12px;
  border-radius: 18px;
  background: linear-gradient(135deg, #223b61, #34598a);
  color: #fff;
  font-size: 13px;
  font-weight: var(--font-semibold);
}

.table-wrap {
  margin-top: 18px;
  overflow: auto;
  border: 1px solid rgba(32, 42, 67, 0.08);
  border-radius: 24px;
}

table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  background: rgba(255, 255, 255, 0.92);
}

th,
td {
  padding: 14px 16px;
  border-bottom: 1px solid rgba(32, 42, 67, 0.08);
  text-align: left;
  vertical-align: top;
  font-size: 14px;
  line-height: 1.7;
}

th {
  background: rgba(34, 59, 97, 0.06);
  font-weight: var(--font-semibold);
}

.accent-card {
  background:
    linear-gradient(180deg, rgba(255, 248, 236, 0.98), rgba(255, 255, 255, 0.92));
}

.flow-card {
  background:
    radial-gradient(circle at top right, rgba(63, 123, 255, 0.09), transparent 26%),
    rgba(255, 255, 255, 0.9);
}

.timeline {
  display: grid;
  grid-template-columns: repeat(11, minmax(110px, 1fr));
  gap: 12px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.timeline-step {
  display: grid;
  gap: 10px;
  min-height: 126px;
  padding: 16px;
  border-radius: 22px;
  border: 1px solid rgba(63, 123, 255, 0.12);
  background: linear-gradient(180deg, rgba(63, 123, 255, 0.08), rgba(248, 58, 58, 0.06));
}

.timeline-step strong {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: #fff;
  color: #27456f;
  font-size: 13px;
}

.timeline-step span {
  color: var(--color-text);
  font-weight: var(--font-semibold);
  line-height: 1.5;
}

.quality-item span {
  display: inline-block;
  margin-bottom: 10px;
  color: #27456f;
  font-size: 14px;
  font-weight: var(--font-semibold);
}

.architecture-card {
  background:
    radial-gradient(circle at top left, rgba(248, 58, 58, 0.12), transparent 24%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(243, 247, 255, 0.92));
}

.dark-card {
  background:
    linear-gradient(180deg, rgba(24, 35, 54, 0.98), rgba(31, 51, 80, 0.94));
  color: #f3f6fc;
}

.dark-card p,
.dark-card h3,
.dark-card .card-label,
.dark-card .chip-grid span {
  color: inherit;
}

.dark-card .chip-grid span {
  border-color: rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.08);
}

.chip-grid span {
  border: 1px solid rgba(248, 58, 58, 0.12);
  background: #fff6f2;
  color: var(--color-brand-deep);
}

@media (max-width: 1100px) {
  .hero,
  .overview-grid,
  .duo-grid,
  .mapping-grid,
  .schema-layout,
  .triple-grid,
  .quality-grid,
  .phase-card {
    grid-template-columns: 1fr;
  }

  .hero-copy h1,
  .section-heading h2 {
    max-width: none;
  }

  .phase-card {
    align-items: start;
  }
}

@media (max-width: 767px) {
  .page-shell {
    padding-top: 14px;
  }

  .hero {
    padding: 20px;
  }

  .hero-copy h1 {
    font-size: 34px;
  }

  .hero-desc {
    font-size: 14px;
  }

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

  .section-card {
    padding: 18px 16px;
    border-radius: 24px;
  }

  .info-card,
  .schema-card,
  .stack-card,
  .quality-item {
    padding: 16px;
    border-radius: 20px;
  }

  .section-heading h2 {
    font-size: 28px;
  }

  .quick-nav {
    top: 0;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-top: 12px;
    padding-bottom: 6px;
  }

  .quick-nav a {
    white-space: nowrap;
  }

  th,
  td {
    font-size: 13px;
    padding: 12px 14px;
  }
}