/* TermPilot site — shared warm palette aligned with the product line,
   light & dark, zero dependencies, self-hosted system fonts only. */

:root {
  /* Neutral, tool-grade palette: greyscale chrome, one restrained
     accent, dark default — the site mirrors the app skin. */
  --bg: #1e2022;
  --bg-alt: #1a1c1e;
  --bg-raised: #26282b;
  --text: #d7d9db;
  --text-dim: #85888c;
  --accent: #4c7d9e;
  --accent-hover: #5c8fae;
  --border: #303236;
}

[data-theme="light"] {
  --bg: #f2f3f4;
  --bg-alt: #e9eaea;
  --bg-raised: #ffffff;
  --text: #242628;
  --text-dim: #6e7175;
  --accent: #38678a;
  --accent-hover: #2f5a7b;
  --border: #d4d6d8;
}

* { box-sizing: border-box; }

html:lang(en) .reader-zh,
html:lang(zh) .reader-en { display: none !important; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto,
    "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* nav */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1120px; margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.brand { font-weight: 700; font-size: 1.05rem; color: var(--text); }
.nav-links { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.nav-links a { color: var(--text-dim); font-size: 0.95rem; }
.nav-links a:hover { color: var(--text); }
.lang-btn, .theme-btn {
  background: transparent; border: 1px solid var(--border); color: var(--text);
  border-radius: 6px; padding: 4px 10px; font: inherit; cursor: pointer;
}
.lang-dropdown-wrapper { position: relative; }
.lang-menu {
  display: none; position: absolute; right: 0; margin: 6px 0 0; padding: 4px;
  list-style: none; background: var(--bg-raised); border: 1px solid var(--border);
  border-radius: 8px; min-width: 130px;
}
.lang-dropdown-wrapper:hover .lang-menu,
.lang-dropdown-wrapper:focus-within .lang-menu { display: block; }
.lang-choice button {
  width: 100%; border: 0; background: transparent; color: var(--text);
  font: inherit; text-align: left; padding: 6px 10px; cursor: pointer;
  border-radius: 6px;
}
.lang-choice button:hover { background: var(--bg-alt); }

/* hero */
.hero {
  max-width: 900px; margin: 0 auto; padding: 96px 24px 72px; text-align: center;
}
.kicker {
  color: var(--accent); font-weight: 600; letter-spacing: 0.08em;
  text-transform: uppercase; font-size: 0.85rem; margin: 0 0 12px;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem); letter-spacing: -0.025em;
  line-height: 1.15; margin: 0 0 20px;
}
.lede { font-size: 1.15rem; color: var(--text-dim); max-width: 44rem; margin: 0 auto 28px; }
.cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 10px 22px; border-radius: 8px;
  font-weight: 600; border: 1px solid var(--border);
}
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); text-decoration: none; }
.btn-secondary { color: var(--text); background: var(--bg-raised); }
.btn-secondary:hover { text-decoration: none; border-color: var(--accent); }
.hero-note { color: var(--text-dim); font-size: 0.9rem; margin-top: 20px; }

/* sections */
.section { max-width: 1120px; margin: 0 auto; padding: 72px 24px; }
.section-alt { background: var(--bg-alt); }
.section h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); letter-spacing: -0.02em; margin: 0 0 28px; }
.section-lede { max-width: 46rem; color: var(--text-dim); font-size: 1.08rem; }
.grid-3 {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}
.card {
  background: var(--bg-raised); border: 1px solid var(--border);
  border-radius: 12px; padding: 22px;
}
.card h3 { margin: 0 0 10px; font-size: 1.05rem; }
.card p { margin: 0; color: var(--text-dim); font-size: 0.95rem; }

/* footer */
.footer {
  border-top: 1px solid var(--border); text-align: center;
  padding: 32px 24px; color: var(--text-dim); font-size: 0.9rem;
}
.footer p { margin: 4px 0; }

@media (max-width: 800px) {
  .grid-3 { grid-template-columns: 1fr; }
  .hero { padding: 64px 20px 48px; }
  .nav-inner { padding: 12px 16px; }
}