/* iSnapture 官网公共样式：首页 / 支持 / 隐私政策共用，自动适配深色模式 */
:root {
  --accent: #f97316;
  --accent-strong: #ea580c;
  --accent-soft: #fff7ed;
  --accent-line: #fed7aa;
  --bg: #ffffff;
  --bg-alt: #f7f7f8;
  --card: #ffffff;
  --text: #1d1d1f;
  --text-2: #4b4b52;
  --text-3: #8a8a92;
  --line: #e7e7ea;
  --shadow: 0 1px 2px rgba(0,0,0,.04), 0 8px 24px rgba(0,0,0,.06);
}
@media (prefers-color-scheme: dark) {
  :root {
    --accent-soft: #2a1a0e;
    --accent-line: #5a3415;
    --bg: #111113;
    --bg-alt: #18181b;
    --card: #1f1f23;
    --text: #f2f2f4;
    --text-2: #c4c4cc;
    --text-3: #8a8a94;
    --line: #2c2c31;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
  }
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", "PingFang SC", "Hiragino Sans", "Apple SD Gothic Neo", sans-serif;
  color: var(--text); background: var(--bg); line-height: 1.6;
}
a { color: var(--accent-strong); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 760px; }

/* 顶栏 */
.nav { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(180%) blur(16px); -webkit-backdrop-filter: saturate(180%) blur(16px); border-bottom: 1px solid var(--line); }
.nav .wrap { display: flex; align-items: center; gap: 20px; height: 56px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 17px; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand img { width: 28px; height: 28px; }
.nav-links { display: flex; gap: 18px; margin-left: auto; align-items: center; }
.nav-links a { color: var(--text-2); font-size: 14px; }
.nav-links a.current { color: var(--text); font-weight: 600; }
.lang-select { font: inherit; font-size: 13px; color: var(--text-2); background: var(--bg-alt); border: 1px solid var(--line);
  border-radius: 8px; padding: 4px 8px; cursor: pointer; }

/* 按钮 */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 22px; border-radius: 12px; font-weight: 600; font-size: 16px; }
.btn:hover { text-decoration: none; filter: brightness(1.05); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-ghost { background: var(--card); color: var(--text); border: 1px solid var(--line); }

/* 首页大图区 */
.hero { padding-block: 72px 40px; text-align: center; }
.hero-icon { width: 104px; height: 104px; margin: 0 auto 20px; filter: drop-shadow(0 10px 24px rgba(249,115,22,.35)); }
.hero h1 { font-size: clamp(32px, 6vw, 54px); line-height: 1.15; letter-spacing: -0.02em; margin-bottom: 14px; }
.hero p.lead { font-size: clamp(17px, 2.4vw, 21px); color: var(--text-2); max-width: 680px; margin: 0 auto 28px; }
.hero .actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero .note { margin-top: 14px; font-size: 13px; color: var(--text-3); }

/* 截图轮播 */
.gallery { padding: 8px 0 56px; }
.gallery-main { border-radius: 16px; overflow: hidden; box-shadow: var(--shadow); background: var(--bg-alt); aspect-ratio: 16 / 10; }
.gallery-main img { width: 100%; height: 100%; object-fit: cover; }
.thumbs { display: flex; gap: 10px; justify-content: center; margin-top: 14px; flex-wrap: wrap; }
.thumbs button { width: 112px; aspect-ratio: 16 / 10; border-radius: 8px; overflow: hidden; border: 2px solid transparent;
  padding: 0; cursor: pointer; background: var(--bg-alt); opacity: .65; transition: opacity .15s, border-color .15s; }
.thumbs button.active, .thumbs button:hover { opacity: 1; border-color: var(--accent); }
.thumbs img { width: 100%; height: 100%; object-fit: cover; }

/* 区块 */
section.block { padding: 56px 0; }
section.alt { background: var(--bg-alt); }
.block h2 { font-size: clamp(24px, 3.6vw, 34px); letter-spacing: -0.01em; text-align: center; margin-bottom: 10px; }
.block .sub { text-align: center; color: var(--text-2); margin-bottom: 36px; }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 22px; }
.card .ico { font-size: 24px; margin-bottom: 10px; }
.card h3 { font-size: 17px; margin-bottom: 6px; }
.card p { font-size: 15px; color: var(--text-2); }

.plans { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; max-width: 820px; margin: 0 auto; }
.plan { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 26px; }
.plan.pro { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent); }
.plan h3 { font-size: 20px; margin-bottom: 4px; }
.plan .tag { color: var(--text-3); font-size: 14px; margin-bottom: 14px; }
.plan ul { list-style: none; }
.plan li { padding: 6px 0 6px 26px; position: relative; font-size: 15px; color: var(--text-2); border-top: 1px solid var(--line); }
.plan li:first-child { border-top: 0; }
.plan li::before { content: "✓"; position: absolute; left: 4px; color: var(--accent); font-weight: 700; }
.plans-note { text-align: center; color: var(--text-3); font-size: 14px; margin-top: 18px; }

.privacy-band { text-align: center; }
.privacy-band p { max-width: 640px; margin: 0 auto 16px; color: var(--text-2); }

/* 支持 / 隐私等文档页 */
.page-head { padding-block: 56px 24px; text-align: center; }
.page-head h1 { font-size: clamp(30px, 5vw, 44px); letter-spacing: -0.02em; margin-bottom: 8px; }
.page-head p { color: var(--text-2); }
.doc { padding-block: 16px 64px; }
.doc h2 { font-size: 22px; margin: 36px 0 12px; }
.doc h3 { font-size: 17px; margin: 22px 0 8px; }
.doc p, .doc li { color: var(--text-2); font-size: 16px; margin-bottom: 10px; }
.doc ul, .doc ol { padding-left: 22px; margin-bottom: 12px; }
.doc .updated { color: var(--text-3); font-size: 14px; }
kbd { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9em; background: var(--bg-alt); border: 1px solid var(--line);
  border-bottom-width: 2px; border-radius: 6px; padding: 1px 6px; color: var(--text); white-space: nowrap; }

.contact { background: var(--accent-soft); border: 1px solid var(--accent-line); border-radius: 16px; padding: 24px; margin: 8px 0 8px; }
.contact h2 { margin-top: 0; }
.contact .btn { margin-top: 6px; }

.keys { width: 100%; border-collapse: collapse; margin: 8px 0 12px; }
.keys td { padding: 10px 6px; border-top: 1px solid var(--line); color: var(--text-2); font-size: 15px; }
.keys tr:first-child td { border-top: 0; }
.keys td:last-child { text-align: right; }

details.faq { background: var(--card); border: 1px solid var(--line); border-radius: 12px; margin-bottom: 10px; }
details.faq summary { cursor: pointer; padding: 16px 18px; font-weight: 600; list-style: none; position: relative; padding-right: 44px; }
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::after { content: "+"; position: absolute; right: 18px; top: 13px; font-size: 20px; color: var(--text-3); }
details.faq[open] summary::after { content: "–"; }
details.faq .answer { padding: 0 18px 14px; }
details.faq .answer p, details.faq .answer li { font-size: 15px; }

/* 页脚 */
.footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--text-3); font-size: 14px; }
.footer .wrap { display: flex; gap: 18px; flex-wrap: wrap; align-items: center; }
.footer a { color: var(--text-3); }
.footer .links { margin-left: auto; display: flex; gap: 16px; }

@media (max-width: 820px) {
  .grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .nav-links a.hide-sm { display: none; }
  .grid, .plans { grid-template-columns: 1fr; }
  .hero { padding-top: 48px; }
  .thumbs button { width: 64px; }
  .footer .links { margin-left: 0; }
}