/* OpenRead — site styles. Dark, paper-warm accent, matches the vuba.one family. */

:root {
  --bg:        #0b1120;
  --bg-soft:   #111a2e;
  --card:      #141d33;
  --card-edge: #24304d;
  --ink:       #e8edf7;
  --ink-dim:   #9aa7c2;
  --ink-faint: #6b7794;
  --accent:    #f0b775;   /* warm paper / lamplight */
  --accent-2:  #7aa2f7;
  --focus:     #f0b775;
  --radius:    16px;
  --maxw:      920px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  background-image:
    radial-gradient(1100px 520px at 50% -10%, rgba(240,183,117,.10), transparent 65%),
    radial-gradient(800px 400px at 12% 8%, rgba(122,162,247,.08), transparent 60%);
  background-repeat: no-repeat;
  color: var(--ink);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

:lang(zh) body { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; border-radius: 6px; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ---------------------------------------------------------------- header */
.topbar {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 18px 0 6px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: .2px; color: var(--ink); }
.brand img { width: 26px; height: 26px; border-radius: 7px; display: block; }
.brand a { color: var(--ink); }
.topbar .sub { color: var(--ink-faint); font-size: .86rem; }
.topbar .spacer { flex: 1 1 auto; }

.langs { display: flex; flex-wrap: wrap; gap: 6px; padding: 8px 0 4px; }
.langs a {
  font-size: .82rem; color: var(--ink-dim);
  padding: 4px 10px; border: 1px solid var(--card-edge); border-radius: 999px;
  background: rgba(255,255,255,.02);
}
.langs a:hover { color: var(--ink); text-decoration: none; border-color: var(--accent); }
.langs a[aria-current="true"] { color: var(--bg); background: var(--accent); border-color: var(--accent); font-weight: 600; }

/* ------------------------------------------------------------------ hero */
.hero { padding: 40px 0 8px; text-align: center; }
.hero .icon { width: 104px; height: 104px; border-radius: 24px; box-shadow: 0 18px 46px rgba(0,0,0,.5); display: block; margin: 0 auto 18px; }
.badge {
  display: inline-block; font-size: .78rem; letter-spacing: .04em; text-transform: uppercase;
  color: var(--ink-dim); border: 1px solid var(--card-edge); border-radius: 999px; padding: 5px 12px; margin-bottom: 16px;
}
.hero h1 { font-size: clamp(2.3rem, 7vw, 3.4rem); line-height: 1.05; margin: 0 0 10px; letter-spacing: -.02em; }
.hero .tagline { font-size: clamp(1.1rem, 3vw, 1.35rem); color: var(--accent); margin: 0 0 18px; }
.hero .lede { color: var(--ink-dim); max-width: 640px; margin: 0 auto; font-size: 1.04rem; }

.cta { margin: 30px 0 6px; }

/* Apple "Download on the App Store" lockup — black badge, same as the other apps */
.btn {
  display: inline-flex; align-items: center; gap: 11px;
  background: #000; color: #fff;
  border: 1px solid rgba(255,255,255,.24); border-radius: 14px;
  padding: 9px 20px 10px;
  box-shadow: 0 10px 30px rgba(0,0,0,.45);
}
.btn:hover { text-decoration: none; transform: translateY(-1px); border-color: rgba(255,255,255,.4); }
.btn .applemark { width: 27px; height: 27px; fill: #fff; flex: 0 0 auto; margin-top: -4px; }
.btn .lockup { display: flex; flex-direction: column; align-items: flex-start; line-height: 1.08; white-space: nowrap; }
.btn .lockup small { font-size: .8rem; font-weight: 400; letter-spacing: .005em; }
.btn .lockup strong { font-size: 1.42rem; font-weight: 600; letter-spacing: -.015em; }
.btn.disabled {
  background: var(--card); color: var(--ink-dim); font-weight: 500; font-size: 1rem;
  border: 1px dashed var(--card-edge); box-shadow: none; cursor: default; padding: 14px 24px;
}
.cta .note { color: var(--ink-faint); font-size: .86rem; margin-top: 14px; }

/* -------------------------------------------------------------- sections */
section { padding: 44px 0 8px; }
h2 { font-size: 1.5rem; margin: 0 0 22px; letter-spacing: -.01em; }
h2::after { content: ""; display: block; width: 46px; height: 3px; background: var(--accent); border-radius: 2px; margin-top: 10px; }

.grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.card {
  background: var(--card); border: 1px solid var(--card-edge); border-radius: var(--radius);
  padding: 20px 20px 22px;
}
.card .ico { font-size: 1.55rem; line-height: 1; display: block; margin-bottom: 12px; }
.card h3 { font-size: 1.03rem; margin: 0 0 7px; }
.card p { margin: 0; color: var(--ink-dim); font-size: .94rem; }

.steps { counter-reset: step; display: grid; gap: 12px; }
.step { display: flex; gap: 16px; align-items: flex-start; background: var(--bg-soft); border: 1px solid var(--card-edge); border-radius: var(--radius); padding: 18px 20px; }
.step::before {
  counter-increment: step; content: counter(step);
  flex: 0 0 auto; width: 30px; height: 30px; border-radius: 50%;
  background: var(--accent); color: var(--bg); font-weight: 700; font-size: .95rem;
  display: grid; place-items: center;
}
.step h3 { margin: 2px 0 5px; font-size: 1.02rem; }
.step p { margin: 0; color: var(--ink-dim); font-size: .94rem; }

.panel {
  background: linear-gradient(180deg, rgba(240,183,117,.09), rgba(240,183,117,.02));
  border: 1px solid rgba(240,183,117,.28); border-radius: var(--radius);
  padding: 24px 24px 26px;
}
.panel p { margin: 0 0 14px; color: var(--ink); }
.panel a { font-weight: 600; }

/* --------------------------------------------------------- privacy page */
.doc { padding: 22px 0 0; }
.doc h1 { font-size: clamp(1.9rem, 5vw, 2.5rem); margin: 6px 0 6px; letter-spacing: -.02em; }
.doc .updated { color: var(--ink-faint); font-size: .9rem; margin: 0 0 30px; }
.doc h2 { font-size: 1.22rem; margin: 34px 0 12px; }
.doc h2::after { display: none; }
.doc p, .doc li { color: var(--ink-dim); }
.doc p { margin: 0 0 14px; }
.doc strong { color: var(--ink); font-weight: 600; }
.doc ul { margin: 0 0 14px; padding-left: 20px; }
.doc li { margin-bottom: 9px; }
.doc .lead { color: var(--ink); font-size: 1.04rem; }
.doc .note-foot { margin-top: 30px; }
.mailto {
  display: inline-block; background: var(--card); border: 1px solid var(--card-edge);
  border-radius: 12px; padding: 11px 18px; font-weight: 600; margin-top: 4px;
}
.backlink { display: inline-block; color: var(--ink-dim); font-size: .9rem; padding: 16px 0 0; }

/* ---------------------------------------------------------------- footer */
footer { margin-top: 56px; padding: 26px 0 40px; border-top: 1px solid var(--card-edge); color: var(--ink-faint); font-size: .88rem; }
footer p { margin: 0 0 6px; }
footer a { color: var(--ink-dim); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn:hover { transform: none; }
}