:root {
  --ink: #16324a;
  --muted: #3f6d8a;
  --line: #b9dff3;
  --bg: #7ecbf2;
  --paper: #f3fbff;
  --brand: #1c9be6;
  --brand-dark: #0b78c4;
  --accent: #0a6eaf;
  --accent-dark: #085a90;
  --card: #ffffff;
  --shadow: 0 10px 30px rgba(16, 110, 170, 0.12);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.45), transparent 32%),
    var(--bg);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

a { color: var(--brand); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent); }

img { max-width: 100%; }

.wrap { width: min(1080px, calc(100% - 32px)); margin: 0 auto; }

.top {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(232, 247, 255, 0.94);
  border-bottom: 4px solid #3aa6ea;
  backdrop-filter: blur(10px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.logo:hover { color: var(--brand); }

.mark {
  width: 30px;
  height: 30px;
  flex: none;
  display: block;
  object-fit: contain;
}

.nav-links { display: flex; align-items: center; gap: 8px; }

.nav-links a {
  color: var(--ink);
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 999px;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  background: rgba(28, 155, 230, 0.16);
  color: var(--brand-dark);
}

.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-btn { display: none; }

.hero { padding: 42px 0 20px; }

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 28px;
  align-items: center;
}

.kicker {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 13px;
  letter-spacing: 0.08em;
}

h1, h2, h3 { line-height: 1.35; font-weight: 700; }

h1 { font-size: 40px; margin: 0 0 12px; letter-spacing: -0.02em; }
h2 { font-size: 26px; margin: 0 0 12px; }
h3 { font-size: 18px; margin: 0 0 8px; }

.lede { font-size: 18px; color: #314052; margin: 0 0 18px; }

.badge {
  display: inline-block;
  margin-left: 8px;
  padding: 2px 8px;
  border-radius: 999px;
  background: #dff3ff;
  color: var(--brand-dark);
  font-size: 13px;
  vertical-align: 6px;
  letter-spacing: 0;
}

.actions, .btn-row { display: flex; flex-wrap: wrap; gap: 10px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 16px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 700;
  border: 1px solid transparent;
}

.btn-main { background: var(--brand); color: #fff; }
.btn-main:hover { background: var(--brand-dark); color: #fff; }
.btn-line { background: #fff; color: var(--brand-dark); border-color: #8ecff2; }
.btn-line:hover { border-color: var(--brand); color: var(--brand); }

.mock {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 10px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 14px;
  box-shadow: var(--shadow);
}

.mock p, .mock li { margin: 0; }

.bubble {
  background: #e7f5fd;
  border-radius: 12px;
  padding: 10px 12px;
  margin-bottom: 8px;
  color: #243140;
}

.bubble.me { background: #d4efff; }

.phrase-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.phrase-list li {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 10px;
  background: #fff;
}
.phrase-list li:first-child { border-color: #8ecff0; background: #eef8ff; }

.section { padding: 18px 0 8px; }
.panel {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 22px;
  box-shadow: var(--shadow);
}

.cards, .grid-3, .feature-grid, .article-list, .download-grid {
  display: grid;
  gap: 14px;
}

.grid-3 { grid-template-columns: repeat(3, 1fr); }
.feature-grid { grid-template-columns: repeat(4, 1fr); }
.download-grid { grid-template-columns: repeat(2, 1fr); }
.article-list { grid-template-columns: 1fr; }

.card, .feature, .download-card, .article-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
}

.feature strong, .download-card h2, .article-card h2 { display: block; margin-bottom: 6px; }
.feature p, .card p, .download-card p, .article-card p { margin: 0; color: var(--muted); }

.soft { color: var(--muted); }

.crumbs { color: var(--muted); font-size: 14px; margin: 0 0 14px; }
.crumbs a { color: var(--muted); }

.meta-line { color: var(--muted); font-size: 14px; }

.article { max-width: 760px; }
.article p { margin: 0 0 14px; }
.article h2 { margin-top: 28px; }

.daily {
  margin: 22px 0;
  padding: 16px 16px 6px;
  background: #e7f6ff;
  border-left: 4px solid var(--brand);
  border-radius: 0 12px 12px 0;
}

.notice {
  background: #fff6ee;
  border: 1px solid #f3d2bc;
  color: #6d3b16;
  border-radius: 12px;
  padding: 12px 14px;
}

.site-footer {
  margin-top: 28px;
  padding: 26px 0 40px;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.site-footer p { margin: 0 0 8px; }
.site-footer a { color: #0b78c4; }

table { width: 100%; border-collapse: collapse; background: #fff; }
th, td { border-bottom: 1px solid var(--line); text-align: left; padding: 10px 8px; vertical-align: top; }
th { color: #314052; font-weight: 700; }

@media (max-width: 860px) {
  h1 { font-size: 32px; }
  .hero-grid, .grid-3, .feature-grid, .download-grid, .mock { grid-template-columns: 1fr; }
  .nav-btn {
    display: inline-flex;
    align-items: center;
    min-height: 40px;
    padding: 0 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: #fff;
  }
  .nav-links {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 68px;
    flex-direction: column;
    align-items: stretch;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 8px;
    box-shadow: var(--shadow);
  }
  .nav-toggle:checked ~ .nav-links { display: flex; }
}