/* ============================================================
   个人软件套件 · 官网共享样式（index.html / help.html 共用）
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --brand: #4f6df5;
  --brand-dark: #3d55d8;
  --brand-2: #8b5cf6;
  --grad: linear-gradient(135deg, #4f6df5 0%, #8b5cf6 100%);
  --ink: #111827;
  --sub: #6b7280;
  --faint: #9ca3af;
  --border: #e5e7eb;
  --soft: #f8fafc;
  --ok: #16a34a;
  --warn: #d97706;
  --radius: 12px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "Cascadia Code", Consolas, "Courier New", monospace;
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: #fff;
  color: var(--ink);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* ============ 顶部导航 ============ */
.topbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.86);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: 60px;
}
.topbar .wrap { display: flex; align-items: center; gap: 28px; height: 100%; }
.topbar .brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.02rem; }
.topbar .brand img { width: 30px; height: 30px; border-radius: 8px; }
.topbar .brand small { font-weight: 500; color: var(--faint); font-size: .72rem; display: block; line-height: 1.1; }
.topbar nav { margin-left: auto; display: flex; align-items: center; gap: 22px; }
.topbar nav a { font-size: .9rem; color: var(--sub); transition: .15s; }
.topbar nav a:hover { color: var(--brand); }
.topbar nav a.cta {
  background: var(--grad); color: #fff; font-weight: 600;
  padding: 7px 16px; border-radius: 8px;
}
.topbar nav a.cta:hover { filter: brightness(1.08); color: #fff; }
.lang-toggle {
  font-size: .78rem; font-weight: 700; color: var(--brand);
  background: rgba(79,109,245,.08); border: 1px solid rgba(79,109,245,.3);
  border-radius: 999px; padding: 5px 13px; cursor: pointer; transition: .15s;
  font-family: var(--font); line-height: 1.4;
}
.lang-toggle:hover { background: rgba(79,109,245,.16); }
@media (max-width: 760px) { .topbar nav a:not(.cta) { display: none; } }

/* ============ 通用元件 ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-weight: 600; font-size: .95rem;
  padding: 12px 26px; border-radius: 10px;
  transition: .18s; cursor: pointer; border: 1px solid transparent;
}
.btn.primary { background: var(--grad); color: #fff; box-shadow: 0 6px 18px rgba(79,109,245,.32); }
.btn.primary:hover { filter: brightness(1.07); transform: translateY(-1px); }
.btn.ghost { background: #fff; border-color: var(--border); color: var(--ink); }
.btn.ghost:hover { border-color: var(--brand); color: var(--brand); }
.btn.small { padding: 8px 16px; font-size: .85rem; border-radius: 8px; }

.tag {
  display: inline-block; font-size: .72rem; color: var(--sub);
  border: 1px solid var(--border); background: var(--soft);
  border-radius: 999px; padding: 2px 10px;
}

.sec { padding: 72px 0; }
.sec.alt { background: var(--soft); }
.sec-head { max-width: 720px; margin: 0 auto 40px; text-align: center; }
.sec-head .kicker {
  font-size: .78rem; font-weight: 700; letter-spacing: 3px;
  color: var(--brand); text-transform: uppercase;
}
.sec-head h2 { font-size: 1.75rem; margin: 8px 0 10px; }
.sec-head p { color: var(--sub); font-size: .95rem; }

/* ============ 页脚 ============ */
footer { border-top: 1px solid var(--border); background: var(--soft); padding: 36px 0; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; justify-content: space-between; color: var(--sub); font-size: .84rem; }
footer nav { display: flex; gap: 18px; flex-wrap: wrap; }
footer nav a:hover { color: var(--brand); }

/* ============ FAQ 折叠 ============ */
.faq { max-width: 800px; margin: 0 auto; }
.faq details {
  border: 1px solid var(--border); border-radius: 10px;
  background: #fff; margin-bottom: 10px; overflow: hidden;
}
.faq summary {
  cursor: pointer; padding: 15px 18px; font-weight: 600; font-size: .95rem;
  list-style: none; display: flex; align-items: center; gap: 10px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: "Q"; flex: none; width: 22px; height: 22px; border-radius: 6px; background: var(--grad); color: #fff; font-size: .72rem; display: grid; place-items: center; font-weight: 800; }
.faq details[open] summary { border-bottom: 1px solid var(--border); color: var(--brand); }
.faq .a { padding: 14px 18px 16px 50px; color: var(--sub); font-size: .9rem; }
.faq .a a { color: var(--brand); font-weight: 600; }

/* ============ 移动端截图条（首页 / 帮助页共用） ============ */
.phone-strip {
  display: flex; gap: 18px; overflow-x: auto;
  padding: 6px 2px 18px; scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}
.phone-strip figure {
  flex: 0 0 176px; margin: 0; scroll-snap-align: center;
  border: 1px solid var(--border); border-radius: 20px; overflow: hidden;
  background: #fff; box-shadow: 0 12px 30px rgba(17,24,39,.12);
  transition: .2s;
}
.phone-strip figure:hover { transform: translateY(-4px); border-color: rgba(79,109,245,.45); }
.phone-strip img { width: 100%; display: block; aspect-ratio: 390 / 844; object-fit: cover; object-position: top; }
.phone-strip figcaption {
  padding: 9px 10px; font-size: .76rem; color: var(--sub);
  border-top: 1px solid var(--border); background: var(--soft);
  text-align: center; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.mb-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-top: 8px; }
@media (max-width: 560px) { .phone-strip figure { flex-basis: 148px; } }

/* ============ 手机样机（真机截图外框，两页共用） ============ */
.phone {
  width: 236px; flex: none;
  background: #0f172a; border-radius: 36px; padding: 9px;
  box-shadow: 0 22px 52px rgba(15, 23, 42, .26), 0 4px 12px rgba(15, 23, 42, .14);
  position: relative;
}
.phone::before {
  content: ""; position: absolute; top: 16px; left: 50%; transform: translateX(-50%);
  width: 74px; height: 17px; border-radius: 999px; background: #0f172a; z-index: 2;
}
.phone img {
  width: 100%; display: block; border-radius: 28px;
  aspect-ratio: 390 / 844; object-fit: cover; object-position: top;
}
.phone-sm { width: 196px; border-radius: 30px; padding: 8px; }
.phone-sm::before { top: 14px; width: 62px; height: 14px; }
.phone-sm img { border-radius: 23px; }
@media (max-width: 560px) { .phone { width: 200px; border-radius: 30px; padding: 8px; } .phone img { border-radius: 23px; } .phone::before { top: 13px; width: 62px; height: 14px; } }