/* ============================================================================
 * 沿伸远程桌面控制 · 官网样式（纯静态 / 系统字体 / 无外部依赖）
 * ========================================================================== */

:root {
  --brand: #2b5cff;          /* 主品牌蓝 */
  --brand-2: #6a8bff;
  --brand-dark: #1b3fb0;
  --accent: #ff9d2e;         /* 会员橙 */
  --accent-dark: #e87f12;
  --ink: #16203a;            /* 主文字 */
  --ink-2: #5b6680;          /* 次文字 */
  --ink-3: #8b94ab;          /* 弱文字 */
  --bg: #ffffff;
  --bg-soft: #f5f8ff;        /* 浅灰蓝底 */
  --bg-soft-2: #eef3ff;
  --line: #e6ebf5;           /* 描边 */
  --ok: #21c17a;
  --shadow-sm: 0 2px 10px rgba(27,63,176,.06);
  --shadow: 0 12px 40px rgba(27,63,176,.10);
  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 1160px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  font-size: 16px;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* 内联 SVG 图标：线性风格，颜色继承所在容器 color */
svg:not(:root) { fill: none; stroke: currentColor; stroke-width: 1.8;
  stroke-linecap: round; stroke-linejoin: round; }

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

/* ---------- 顶部导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.86);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav__inner {
  display: flex; align-items: center; gap: 28px;
  height: 68px;
}
.brand { display: flex; align-items: center; gap: 12px; flex: none; }
.brand__logo {
  height: 38px; width: 38px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  box-shadow: var(--shadow-sm);
}
.brand__logo img { height: 30px; width: 30px; object-fit: contain; }
.brand__txt { line-height: 1.1; }
.brand__name { font-size: 18px; font-weight: 800; letter-spacing: .5px; }
.brand__en { font-size: 10px; font-weight: 700; color: var(--ink-3); letter-spacing: 2px; }
.brand__slogan {
  margin-left: 4px; padding-left: 16px; border-left: 1px solid var(--line);
  font-size: 12.5px; color: var(--ink-2); font-weight: 600; white-space: nowrap;
}
.nav__menu { display: flex; gap: 6px; margin-left: auto; }
.nav__menu a {
  padding: 9px 15px; border-radius: 999px; font-size: 15px; font-weight: 600;
  color: var(--ink-2); transition: .18s;
}
.nav__menu a:hover { color: var(--brand); background: var(--bg-soft-2); }
.nav__menu a.active { color: var(--brand); }
.nav__cta {
  display: inline-flex; align-items: center; gap: 7px;
  background: var(--brand); color: #fff; font-weight: 700; font-size: 14px;
  padding: 10px 18px; border-radius: 999px; transition: .18s; box-shadow: var(--shadow-sm);
}
.nav__cta:hover { background: var(--brand-dark); transform: translateY(-1px); }
.nav__toggle { display: none; }

/* ---------- 通用区块 ---------- */
.section { padding: 86px 0; }
.section--soft { background: var(--bg-soft); }
.section__head { text-align: center; max-width: 720px; margin: 0 auto 52px; }
.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 800; letter-spacing: 1.5px;
  color: var(--brand); background: var(--bg-soft-2); padding: 6px 14px; border-radius: 999px;
  margin-bottom: 16px;
}
.section__title { font-size: 34px; font-weight: 800; letter-spacing: -.5px; }
.section__sub { margin-top: 14px; color: var(--ink-2); font-size: 16.5px; }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  background:
    radial-gradient(900px 480px at 80% -10%, rgba(106,139,255,.18), transparent 60%),
    radial-gradient(700px 420px at 0% 110%, rgba(255,157,46,.14), transparent 55%),
    #fff;
  padding: 78px 0 64px;
}
.hero__grid {
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center;
}
.hero__badge {
  display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 700;
  color: var(--brand-dark); background: var(--bg-soft-2); padding: 7px 14px; border-radius: 999px;
  margin-bottom: 22px;
}
.hero__title { font-size: 50px; line-height: 1.12; font-weight: 850; letter-spacing: -1px; }
.hero__title .hl {
  background: linear-gradient(120deg, var(--brand), var(--accent));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero__lead { margin: 22px 0 30px; font-size: 18px; color: var(--ink-2); max-width: 520px; }
.hero__actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 9px; font-size: 16px; font-weight: 700;
  padding: 14px 26px; border-radius: 999px; border: 1px solid transparent; transition: .18s; cursor: pointer;
}
.btn--primary { background: var(--brand); color: #fff; box-shadow: var(--shadow-sm); }
.btn--primary:hover { background: var(--brand-dark); transform: translateY(-2px); }
.btn--ghost { background: #fff; color: var(--ink); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--brand); color: var(--brand); }
.btn--accent { background: var(--accent); color: #fff; }
.btn--accent:hover { background: var(--accent-dark); transform: translateY(-2px); }
.hero__trust { margin-top: 26px; display: flex; gap: 26px; flex-wrap: wrap; color: var(--ink-3); font-size: 13.5px; }
.hero__trust span { display: inline-flex; align-items: center; gap: 7px; }

/* Hero 视觉卡 */
.hero__panel {
  position: relative; background: #fff; border: 1px solid var(--line); border-radius: 20px;
  box-shadow: var(--shadow); padding: 20px; overflow: hidden;
}
.hero__panel-bar { display: flex; align-items: center; gap: 8px; margin-bottom: 16px; }
.dot { width: 11px; height: 11px; border-radius: 50%; }
.dot.r { background: #ff5f57; } .dot.y { background: #febc2e; } .dot.g { background: #28c840; }
.hero__panel-bar span.lbl { margin-left: 8px; font-size: 12.5px; color: var(--ink-3); font-weight: 600; }
.screen {
  border-radius: 12px; background: linear-gradient(160deg, var(--bg-soft), #fff);
  border: 1px solid var(--line); height: 240px; display: flex; align-items: center; justify-content: center;
  color: var(--ink-3); font-size: 14px; text-align: center; padding: 20px; position: relative;
}
.screen svg { width: 64px; height: 64px; opacity: .35; margin-bottom: 10px; }
.hero__chips { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 14px; }
.chip {
  font-size: 12.5px; font-weight: 700; color: var(--brand-dark); background: var(--bg-soft-2);
  padding: 6px 12px; border-radius: 999px;
}

/* ---------- 功能卡片 ---------- */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.fcard {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px;
  transition: .2s; position: relative; overflow: hidden;
}
.fcard:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: transparent; }
.fcard__ic {
  width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff; margin-bottom: 18px;
}
.fcard__ic svg { width: 26px; height: 26px; }
.fcard h3 { font-size: 19px; font-weight: 800; margin-bottom: 8px; }
.fcard p { color: var(--ink-2); font-size: 14.5px; }
.fcard--wide { grid-column: span 3; display: flex; align-items: center; gap: 32px; }
.fcard--wide .fcard__ic { flex: none; }
.fcard--wide .fcard__body { flex: 1; }
.fcard--accent .fcard__ic { background: linear-gradient(135deg, var(--accent), var(--accent-dark)); }

/* 安全条 */
.secure {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 26px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px;
}
.secure__item { display: flex; gap: 12px; align-items: flex-start; }
.secure__item .si { flex: none; width: 40px; height: 40px; border-radius: 11px; background: var(--bg-soft-2);
  display: flex; align-items: center; justify-content: center; color: var(--brand); }
.secure__item .si svg { width: 21px; height: 21px; }
.secure__item b { font-size: 15px; }
.secure__item span { font-size: 13px; color: var(--ink-2); display: block; margin-top: 2px; }

/* ---------- 会员方案 ---------- */
.tiers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: stretch; }
.tier {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 26px;
  display: flex; flex-direction: column; position: relative;
}
.tier--vip { border-color: var(--accent); box-shadow: 0 16px 50px rgba(232,127,18,.16); }
.tier__tag {
  position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  background: linear-gradient(135deg, var(--accent), var(--accent-dark)); color: #fff;
  font-size: 12px; font-weight: 800; padding: 5px 16px; border-radius: 999px; letter-spacing: 1px;
}
.tier__name { font-size: 21px; font-weight: 800; display: flex; align-items: center; gap: 9px; }
.tier__name .ic-wrap { width: 34px; height: 34px; border-radius: 10px; background: var(--bg-soft-2);
  display: flex; align-items: center; justify-content: center; color: var(--brand); }
.tier--vip .tier__name .ic-wrap { background: linear-gradient(135deg, var(--accent), var(--accent-dark)); color: #fff; }
.tier__desc { color: var(--ink-2); font-size: 13.5px; margin: 10px 0 18px; min-height: 42px; }
.tier__price { font-size: 15px; color: var(--ink-2); }
.tier__price b { font-size: 30px; font-weight: 850; color: var(--ink); }
.tier__price .note { font-size: 12.5px; color: var(--ink-3); }
.tier__list { list-style: none; margin: 18px 0 22px; display: flex; flex-direction: column; gap: 11px; flex: 1; }
.tier__list li { display: flex; gap: 10px; font-size: 14px; align-items: flex-start; }
.tier__list li svg { width: 18px; height: 18px; flex: none; margin-top: 2px; color: var(--ok); }
.tier__list li.off { color: var(--ink-3); }
.tier__list li.off svg { color: var(--ink-3); }
.tier .btn { width: 100%; justify-content: center; }

/* 权益对比表 */
.compare { margin-top: 56px; }
.compare h3 { text-align: center; font-size: 24px; font-weight: 800; margin-bottom: 8px; }
.compare p.cap { text-align: center; color: var(--ink-2); margin-bottom: 28px; }
.tablewrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
table.cmp { width: 100%; border-collapse: collapse; min-width: 640px; }
table.cmp th, table.cmp td { padding: 15px 18px; text-align: center; border-bottom: 1px solid var(--line); }
table.cmp thead th { background: var(--bg-soft); font-size: 14.5px; font-weight: 800; }
table.cmp thead th:first-child { text-align: left; }
table.cmp tbody td:first-child { text-align: left; font-weight: 700; color: var(--ink); }
table.cmp tbody tr:last-child td { border-bottom: none; }
table.cmp .yes { color: var(--ok); font-weight: 800; }
table.cmp .no { color: var(--ink-3); }
table.cmp .vipcol { background: rgba(255,157,46,.05); }

/* KEY 有效期 / 兑换码 */
.kv { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; margin-top: 56px; }
.kvcard { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.kvcard h4 { font-size: 18px; font-weight: 800; margin-bottom: 14px; display: flex; align-items: center; gap: 9px; }
.kvcard h4 .ic-wrap { width: 32px; height: 32px; border-radius: 9px; background: var(--bg-soft-2);
  display: flex; align-items: center; justify-content: center; color: var(--brand); }
.kvcard ul { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.kvcard li { display: flex; gap: 10px; font-size: 14px; align-items: flex-start; }
.kvcard li svg { width: 18px; height: 18px; flex: none; margin-top: 3px; color: var(--brand); }
.codebox {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  background: var(--bg-soft); border: 1px dashed var(--brand); border-radius: var(--radius-sm);
  padding: 11px 14px; margin-top: 10px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13.5px; font-weight: 700; color: var(--brand-dark);
}
.codebox .cd { background: #fff; border: 1px solid var(--line); border-radius: 6px; padding: 2px 8px; }
.codebox small { font-weight: 600; color: var(--ink-2); font-family: var(--font); font-size: 12px; }

/* ---------- 下载 ---------- */
.dl { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.dlcard {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px 22px;
  text-align: center; transition: .2s;
}
.dlcard:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.dlcard__ic { width: 60px; height: 60px; margin: 0 auto 16px; border-radius: 16px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff;
  display: flex; align-items: center; justify-content: center; }
.dlcard__ic svg { width: 30px; height: 30px; }
.dlcard h3 { font-size: 17px; font-weight: 800; }
.dlcard p { font-size: 13px; color: var(--ink-2); margin: 6px 0 16px; }
.dlcard .btn { width: 100%; justify-content: center; font-size: 14px; padding: 11px 16px; }

.dlnote {
  max-width: 760px; margin: 36px auto 0; text-align: center; color: var(--ink-2); font-size: 14.5px;
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 26px;
}
.dlnote b { color: var(--ink); }

/* ---------- 帮助 / 联系 ---------- */
.help { display: grid; grid-template-columns: 1.1fr .9fr; gap: 28px; }
.helpcard { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; }
.helpcard h3 { font-size: 20px; font-weight: 800; margin-bottom: 20px; }
.contact { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.contact__item { display: flex; gap: 13px; align-items: flex-start; padding: 16px; border: 1px solid var(--line);
  border-radius: var(--radius-sm); background: var(--bg-soft); }
.contact__item .ci { width: 38px; height: 38px; border-radius: 10px; background: #fff; border: 1px solid var(--line);
  display: flex; align-items: center; justify-content: center; color: var(--brand); flex: none; }
.contact__item .ci svg { width: 20px; height: 20px; }
.contact__item b { font-size: 13px; color: var(--ink-2); font-weight: 600; display: block; }
.contact__item a, .contact__item span.v { font-size: 15.5px; font-weight: 800; color: var(--ink); }
.faq { display: flex; flex-direction: column; gap: 12px; }
.faq details { border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 4px 18px; background: #fff; }
.faq summary { cursor: pointer; font-weight: 700; padding: 14px 0; list-style: none; display: flex;
  justify-content: space-between; align-items: center; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: ""; width: 10px; height: 10px; border-right: 2px solid var(--ink-3);
  border-bottom: 2px solid var(--ink-3); transform: rotate(45deg); transition: .2s; }
.faq details[open] summary::after { transform: rotate(-135deg); }
.faq p { color: var(--ink-2); font-size: 14px; padding: 0 0 14px; }

/* ---------- 页脚 ---------- */
.footer { background: #0f1830; color: #aab4cc; padding: 56px 0 28px; }
.footer__top { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 30px; }
.footer__brand .brand__name, .footer__brand .brand__en { color: #fff; }
.footer__brand p { margin-top: 14px; font-size: 13.5px; line-height: 1.8; }
.footer h5 { color: #fff; font-size: 14px; font-weight: 800; margin-bottom: 16px; letter-spacing: .5px; }
.footer ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer ul a, .footer li { font-size: 13.5px; color: #aab4cc; transition: .15s; }
.footer ul a:hover { color: #fff; }
.footer__bottom { margin-top: 40px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.1);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: 12.5px; color: #808aa3; }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__panel { order: -1; }
  .features, .tiers, .dl { grid-template-columns: repeat(2, 1fr); }
  .fcard--wide { grid-column: span 2; }
  .secure, .kv { grid-template-columns: 1fr 1fr; }
  .help { grid-template-columns: 1fr; }
  .footer__top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .nav__menu, .nav__cta { display: none; }
  .nav__toggle { display: inline-flex; margin-left: auto; border: 1px solid var(--line); background: #fff;
    border-radius: 10px; padding: 9px 12px; cursor: pointer; color: var(--ink); }
  .nav__menu.open { display: flex; position: absolute; top: 68px; left: 0; right: 0; flex-direction: column;
    background: #fff; border-bottom: 1px solid var(--line); padding: 12px 24px; gap: 4px; }
  .section { padding: 60px 0; }
  .hero__title { font-size: 36px; }
  .section__title { font-size: 27px; }
  .features, .tiers, .dl, .secure, .kv, .contact { grid-template-columns: 1fr; }
  .fcard--wide { grid-column: span 1; flex-direction: column; align-items: flex-start; }
  .footer__top { grid-template-columns: 1fr; }
}