/* ============================================================
   OfflineReader — Official Site & Privacy Policy
   Dark, tech-forward. Deep ink-blue background + amber accent.
   No external dependencies: system font stack only.
   ============================================================ */

:root {
  --bg: #0a0e17;            /* ink blue-black */
  --bg-elev: #101624;       /* elevated surface */
  --bg-card: #131b2c;       /* card surface */
  --border: #232c40;        /* hairline border */
  --text: #e8ecf4;          /* primary text */
  --text-dim: #9aa5bc;      /* secondary text */
  --amber: #f5a623;         /* amber gold accent */
  --amber-soft: rgba(245, 166, 35, 0.12);
  --radius: 14px;
  --maxw: 1080px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header / Nav ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 14, 23, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
}
.brand:hover { text-decoration: none; }

.brand-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 12px rgba(245, 166, 35, 0.7);
  flex: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 0.92rem;
}

.nav-links a { color: var(--text-dim); }
.nav-links a:hover, .nav-links a.active { color: var(--amber); text-decoration: none; }

/* ---------- Hero ---------- */

.hero {
  padding: 96px 0 80px;
  text-align: center;
  background:
    radial-gradient(ellipse 60% 45% at 50% 0%, rgba(245, 166, 35, 0.09), transparent 70%),
    var(--bg);
}

.hero-badge {
  display: inline-block;
  padding: 5px 14px;
  border: 1px solid var(--amber);
  border-radius: 999px;
  color: var(--amber);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 26px;
}

.hero h1 {
  font-size: clamp(2.2rem, 5.5vw, 3.6rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
}

.hero h1 .accent { color: var(--amber); }

.hero p.lede {
  max-width: 640px;
  margin: 0 auto 38px;
  color: var(--text-dim);
  font-size: 1.12rem;
}

.btn {
  display: inline-block;
  padding: 13px 30px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 1rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }

.btn-primary {
  background: var(--amber);
  color: #161006;
  box-shadow: 0 4px 22px rgba(245, 166, 35, 0.35);
}
.btn-primary:hover { box-shadow: 0 6px 28px rgba(245, 166, 35, 0.5); }

.btn-ghost {
  border: 1px solid var(--border);
  color: var(--text);
  margin-left: 12px;
}
.btn-ghost:hover { border-color: var(--amber); color: var(--amber); }

/* ---------- Sections ---------- */

section.block { padding: 72px 0; }

.section-title {
  font-size: 1.9rem;
  letter-spacing: -0.01em;
  margin-bottom: 10px;
}

.section-sub {
  color: var(--text-dim);
  max-width: 640px;
  margin-bottom: 40px;
}

.center { text-align: center; }
.center .section-sub { margin-left: auto; margin-right: auto; }

/* Feature cards */

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.card:hover {
  border-color: var(--amber);
  transform: translateY(-3px);
}

.card .icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--amber-soft);
  color: var(--amber);
  font-size: 1.25rem;
  margin-bottom: 16px;
}

.card h3 { font-size: 1.08rem; margin-bottom: 8px; }
.card p { color: var(--text-dim); font-size: 0.93rem; }

/* Privacy highlight band */

.privacy-band {
  background: var(--bg-elev);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.privacy-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 44px;
}

.point { text-align: center; }
.point .big {
  font-size: 2rem;
  font-weight: 800;
  color: var(--amber);
  display: block;
  margin-bottom: 6px;
}
.point h3 { font-size: 1.02rem; margin-bottom: 8px; }
.point p { color: var(--text-dim); font-size: 0.92rem; }

/* Premium pricing */

.plans {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 380px));
  gap: 22px;
  justify-content: center;
}

.plan {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px 30px;
  text-align: center;
}
.plan.featured { border-color: var(--amber); position: relative; }

.plan .tag {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--amber);
  color: #161006;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 14px;
  border-radius: 999px;
  white-space: nowrap;
}

.plan h3 { font-size: 1.15rem; margin-bottom: 6px; }
.plan .price {
  font-size: 2.4rem;
  font-weight: 800;
  margin: 14px 0 4px;
}
.plan .price span { font-size: 1rem; color: var(--text-dim); font-weight: 400; }
.plan .per { color: var(--text-dim); font-size: 0.9rem; margin-bottom: 20px; }
.plan ul {
  list-style: none;
  text-align: left;
  color: var(--text-dim);
  font-size: 0.93rem;
}
.plan ul li { padding: 7px 0 7px 26px; position: relative; }
.plan ul li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--amber);
  font-weight: 700;
}
.plan .note { margin-top: 18px; font-size: 0.82rem; color: var(--text-dim); }

/* Support */

.support-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}
.support-box p { color: var(--text-dim); margin-bottom: 10px; }
.support-box .email { font-size: 1.15rem; font-weight: 600; }

.placeholder {
  color: var(--amber);
  font-weight: 700;
  background: var(--amber-soft);
  padding: 1px 7px;
  border-radius: 5px;
  white-space: nowrap;
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 36px 0 44px;
  color: var(--text-dim);
  font-size: 0.88rem;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
}

.footer-links { display: flex; gap: 22px; }
.footer-links a { color: var(--text-dim); }
.footer-links a:hover { color: var(--amber); text-decoration: none; }

/* ---------- Legal / privacy policy page ---------- */

.legal { max-width: 780px; margin: 0 auto; padding: 64px 24px 96px; }

.legal h1 {
  font-size: 2.1rem;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
}

.legal .effective {
  color: var(--text-dim);
  font-size: 0.92rem;
  margin-bottom: 8px;
}

.legal .lang-switch {
  font-size: 0.88rem;
  margin-bottom: 36px;
}

.legal h2 {
  font-size: 1.3rem;
  margin: 42px 0 12px;
  padding-top: 26px;
  border-top: 1px solid var(--border);
}

.legal h2:first-of-type { border-top: none; padding-top: 0; }

.legal p { color: var(--text-dim); margin-bottom: 12px; }
.legal strong { color: var(--text); }

.legal ul {
  margin: 0 0 14px 22px;
  color: var(--text-dim);
}
.legal ul li { margin-bottom: 7px; }

.legal .callout {
  background: var(--amber-soft);
  border: 1px solid rgba(245, 166, 35, 0.4);
  border-radius: 10px;
  padding: 16px 20px;
  margin: 20px 0;
  color: var(--text);
  font-size: 0.95rem;
}

/* ---------- Responsive ---------- */

@media (max-width: 860px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .privacy-points { grid-template-columns: 1fr; gap: 26px; }
}

@media (max-width: 600px) {
  .hero { padding: 64px 0 56px; }
  .grid { grid-template-columns: 1fr; }
  .plans { grid-template-columns: 1fr; }
  .btn-ghost { margin-left: 0; margin-top: 12px; }
  .btn { width: 100%; text-align: center; }
  .nav-links { gap: 14px; font-size: 0.85rem; }
  section.block { padding: 52px 0; }
  .support-box { padding: 28px 22px; }
}