/* Phone Cleaner — Support Site
   Self-contained stylesheet, no external dependencies. */

:root {
  /* Fixed brand colours — identical in light and dark, used behind white text */
  --brand: #2f6bff;
  --brand-dark: #1b47b8;

  --blue: #2f6bff;
  --blue-dark: #1b47b8;
  --blue-soft: #eef3ff;
  --ink: #101828;
  --ink-2: #475467;
  --ink-3: #667085;
  --line: #e4e7ec;
  --bg: #ffffff;
  --bg-2: #f7f9fc;
  --card: #ffffff;
  --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 8px 24px rgba(16, 24, 40, .06);
  --radius: 16px;
  --max: 900px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --blue: #6f9bff;
    --blue-dark: #8fb2ff;
    --blue-soft: #16203a;
    --ink: #e8ecf4;
    --ink-2: #a9b4c7;
    --ink-3: #8a95a8;
    --line: #253044;
    --bg: #0d1220;
    --bg-2: #121a2b;
    --card: #131b2c;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .35);
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 14px;
  height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -.2px;
}
.brand:hover { text-decoration: none; }
.brand img { width: 28px; height: 28px; border-radius: 7px; display: block; }

.site-nav { margin-left: auto; display: flex; gap: 6px; flex-wrap: wrap; }
.site-nav a {
  color: var(--ink-2);
  font-size: 14px;
  font-weight: 500;
  padding: 7px 11px;
  border-radius: 8px;
}
.site-nav a:hover { background: var(--bg-2); color: var(--ink); text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--blue); background: var(--blue-soft); }

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

.hero {
  background: linear-gradient(160deg, var(--brand) 0%, var(--brand-dark) 100%);
  color: #fff;
  padding: 56px 0 60px;
  text-align: center;
}

.hero img.app-icon {
  width: 96px; height: 96px;
  border-radius: 22px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, .28);
  margin-bottom: 18px;
}

.hero h1 {
  margin: 0 0 8px;
  font-size: 34px;
  line-height: 1.2;
  letter-spacing: -.6px;
}

.hero p.tagline {
  margin: 0 auto 24px;
  max-width: 520px;
  font-size: 17px;
  color: rgba(255, 255, 255, .9);
}

.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 15px;
  border: 1px solid transparent;
  transition: transform .12s ease, opacity .12s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: #fff; color: var(--brand-dark); }
.btn-ghost { background: rgba(255, 255, 255, .14); color: #fff; border-color: rgba(255, 255, 255, .35); }

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

section { padding: 48px 0; }
section + section { border-top: 1px solid var(--line); }

h2 {
  font-size: 24px;
  letter-spacing: -.4px;
  margin: 0 0 6px;
}

.section-sub { color: var(--ink-3); margin: 0 0 26px; font-size: 15px; }

/* ---------- Cards ---------- */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 6px; font-size: 16px; }
.card p { margin: 0; color: var(--ink-2); font-size: 14.5px; }
.card .emoji { font-size: 22px; display: block; margin-bottom: 10px; }

/* ---------- Contact block ---------- */

.contact-box {
  background: var(--blue-soft);
  border: 1px solid color-mix(in srgb, var(--blue) 22%, transparent);
  border-radius: var(--radius);
  padding: 26px;
  text-align: center;
}
.contact-box .email {
  display: inline-block;
  font-size: 20px;
  font-weight: 700;
  margin: 6px 0 10px;
  word-break: break-all;
}
.contact-box p { margin: 0; color: var(--ink-2); font-size: 14.5px; }

/* ---------- FAQ ---------- */

details {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0 18px;
  margin-bottom: 10px;
}
details[open] { box-shadow: var(--shadow); }
summary {
  cursor: pointer;
  list-style: none;
  padding: 15px 0;
  font-weight: 600;
  font-size: 15.5px;
  display: flex;
  align-items: center;
  gap: 10px;
}
summary::-webkit-details-marker { display: none; }
summary::before {
  content: "+";
  color: var(--blue);
  font-weight: 700;
  font-size: 18px;
  width: 16px;
  flex: none;
}
details[open] summary::before { content: "\2212"; }
details .answer {
  padding: 0 0 16px 26px;
  color: var(--ink-2);
  font-size: 15px;
}
details .answer p:first-child { margin-top: 0; }
details .answer p:last-child { margin-bottom: 0; }

/* ---------- Steps ---------- */

ol.steps { padding-left: 20px; color: var(--ink-2); }
ol.steps li { margin-bottom: 8px; }
ol.steps code, .mono {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1px 6px;
  font-size: 13.5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* ---------- Legal pages ---------- */

.legal-header {
  background: var(--bg-2);
  border-bottom: 1px solid var(--line);
  padding: 40px 0 34px;
}
.legal-header h1 { margin: 0 0 6px; font-size: 30px; letter-spacing: -.5px; }
.legal-header .updated { color: var(--ink-3); font-size: 14px; margin: 0; }

.legal { padding: 40px 0 20px; }
.legal h2 {
  font-size: 20px;
  margin: 36px 0 10px;
  padding-top: 6px;
}
.legal h2:first-child { margin-top: 0; }
.legal h3 { font-size: 16px; margin: 22px 0 8px; }
.legal p { color: var(--ink-2); margin: 0 0 14px; }
.legal ul { color: var(--ink-2); padding-left: 22px; margin: 0 0 14px; }
.legal li { margin-bottom: 8px; }
.legal strong { color: var(--ink); }

.callout {
  background: var(--blue-soft);
  border-left: 3px solid var(--blue);
  border-radius: 0 10px 10px 0;
  padding: 14px 18px;
  margin: 0 0 18px;
}
.callout p { margin: 0; color: var(--ink-2); font-size: 15px; }

.toc {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 22px;
  margin-bottom: 34px;
}
.toc strong { display: block; margin-bottom: 8px; font-size: 14px; }
.toc ol { margin: 0; padding-left: 20px; }
.toc li { margin-bottom: 4px; font-size: 14.5px; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 18px;
  font-size: 14.5px;
}
th, td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
  color: var(--ink-2);
}
th { background: var(--bg-2); color: var(--ink); font-weight: 600; }

.table-scroll { overflow-x: auto; }

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

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg-2);
  padding: 32px 0;
  margin-top: 20px;
  font-size: 14px;
  color: var(--ink-3);
}
.site-footer .links { display: flex; gap: 18px; flex-wrap: wrap; margin-bottom: 12px; }
.site-footer p { margin: 4px 0; }

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

@media (max-width: 600px) {
  .hero { padding: 42px 0 46px; }
  .hero h1 { font-size: 27px; }
  .hero img.app-icon { width: 80px; height: 80px; }
  section { padding: 38px 0; }
  h2 { font-size: 21px; }
  .site-header .wrap { height: 56px; gap: 8px; }
  .site-nav { flex-wrap: nowrap; }
  .site-nav a { padding: 6px 9px; font-size: 13.5px; }
  /* In-page anchors are reachable by scrolling; drop them so the bar stays one row */
  .site-nav a.in-page { display: none; }
  /* Icon alone identifies the site; the wordmark would wrap at this width */
  .brand span { display: none; }
}