:root {
  --blue: #1a56db;
  --blue-soft: #93c5fd;
  --navy: #1e3a5f;
  --deep: #0f172a;
  --ink: #1e293b;
  --paper: #f8fafc;
  --muted: #64748b;
  --card: #ffffff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
}

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

.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.container.narrow {
  width: min(760px, calc(100% - 40px));
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(248, 250, 252, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
}

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

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 18px;
  color: #fff;
  background: linear-gradient(145deg, var(--blue), var(--navy));
}

.brand strong {
  display: block;
  font-size: 15px;
}

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

.nav-links {
  display: flex;
  gap: 22px;
  font-size: 14px;
  color: var(--muted);
}

.hero {
  background:
    linear-gradient(180deg, rgba(15, 23, 42, 0.08), rgba(15, 23, 42, 0.02)),
    radial-gradient(circle at 80% 20%, rgba(26, 86, 219, 0.15), transparent 35%),
    linear-gradient(135deg, #eff6ff 0%, #f8fafc 60%, #dbeafe 100%);
  color: var(--deep);
}

.hero-inner {
  padding: 72px 0 64px;
}

.eyebrow {
  letter-spacing: 0.22em;
  font-size: 12px;
  color: var(--blue);
}

.hero h1 {
  margin: 8px 0 18px;
  font-size: clamp(36px, 7vw, 72px);
  line-height: 1.12;
  font-weight: 700;
}

.hero h1 span {
  display: block;
  margin-top: 10px;
  font-size: 0.38em;
  letter-spacing: 0.12em;
  color: var(--navy);
  font-weight: 500;
}

.lead {
  max-width: 680px;
  font-size: 18px;
  color: #334155;
}

.search-box {
  display: flex;
  gap: 10px;
  margin-top: 28px;
  max-width: 560px;
}

.search-box input {
  flex: 1;
  border: 1px solid rgba(15, 23, 42, 0.12);
  border-radius: 12px;
  padding: 14px 16px;
  font: inherit;
  background: #fff;
}

.search-box button {
  border: 0;
  border-radius: 12px;
  padding: 0 22px;
  background: var(--blue);
  color: #fff;
  font: inherit;
  cursor: pointer;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin-top: 28px;
  font-size: 13px;
  color: var(--muted);
}

.intro,
.pillars,
.story,
.about,
.word-list {
  padding: 80px 0;
}

.kicker {
  margin: 0 0 10px;
  color: var(--blue);
  letter-spacing: 0.16em;
  font-size: 12px;
}

h2 {
  margin: 0 0 20px;
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1.25;
}

.section-head {
  margin-bottom: 32px;
}

.grid-3,
.grid-4,
.split,
.footer-grid {
  display: grid;
  gap: 20px;
}

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

.card,
.quote-panel,
.word-card {
  background: var(--card);
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 16px;
  padding: 24px;
}

.card h3 {
  margin-top: 0;
  color: var(--navy);
}

.word-card strong {
  display: block;
  font-size: 20px;
  color: var(--blue);
  margin-bottom: 6px;
}

.word-card span {
  color: var(--muted);
  font-size: 14px;
}

.split {
  grid-template-columns: 1.2fr 0.8fr;
  align-items: start;
}

.checklist {
  padding-left: 18px;
}

.quote-panel {
  background: var(--deep);
  color: #e2e8f0;
}

.quote-panel blockquote {
  margin: 0 0 18px;
  font-size: 20px;
  line-height: 1.5;
}

.numbers {
  padding: 36px 0;
  background: #e0e7ff;
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
  text-align: center;
}

.numbers strong {
  display: block;
  font-size: 30px;
  color: var(--blue);
}

.site-footer {
  padding: 48px 0 56px;
  background: var(--deep);
  color: #cbd5e1;
}

.footer-grid {
  grid-template-columns: 1.2fr 1fr 1fr;
}

@media (max-width: 860px) {
  .nav-links {
    display: none;
  }

  .grid-3,
  .grid-4,
  .split,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .search-box {
    flex-direction: column;
  }
}