/* ============================================================
   站点 6（app）— 极简黑白 · 大字排版风
   设计基调：黑白灰单色 + 柠檬黄强调 + 超大无衬线标题 + 细黑线网格 + 几乎无阴影
   与其它套区别：瑞士/极简风、粗体大标题、方角细边框、单一强调色
   ============================================================ */

:root {
  --black: #111111;
  --ink: #1c1c1c;
  --body: #4a4a4a;
  --muted: #8a8a8a;
  --line: #1c1c1c;
  --line-soft: #e3e3e3;
  --paper: #ffffff;
  --grey: #f4f4f4;
  --grey2: #ededed;
  --acc: #facc15;
  --acc-d: #eab308;
  --navh: 72px;
  --mw: 1200px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Arial", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  background: var(--paper); color: var(--body); line-height: 1.65; -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; transition: color .15s ease, background .15s ease; }
ul { list-style: none; }

.frame { max-width: var(--mw); margin: 0 auto; padding: 0 28px; }

.btn {
  font-family: inherit; display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-weight: 700; font-size: 15px; padding: 14px 30px; border-radius: 0; border: 2px solid var(--black);
  cursor: pointer; transition: transform .12s ease, background .15s ease, color .15s ease; outline: none;
  text-transform: uppercase; letter-spacing: .5px;
}
.btn-solid { background: var(--black); color: #fff; }
.btn-solid:hover { background: var(--acc); color: var(--black); border-color: var(--acc); }
.btn-acc { background: var(--acc); color: var(--black); border-color: var(--black); }
.btn-acc:hover { background: var(--black); color: var(--acc); }
.btn-wire { background: transparent; color: var(--black); }
.btn-wire:hover { background: var(--black); color: #fff; }
.btn:disabled { opacity: .6; cursor: not-allowed; }

@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

/* 导航 */
.bar { position: fixed; top: 0; left: 0; right: 0; height: var(--navh); z-index: 999; background: var(--paper); border-bottom: 2px solid var(--black); }
.barrow { max-width: var(--mw); height: 100%; margin: 0 auto; padding: 0 28px; display: flex; align-items: center; justify-content: space-between; }
.sig { display: flex; align-items: center; gap: 10px; font-weight: 900; font-size: 20px; color: var(--black); letter-spacing: -.5px; text-transform: uppercase; }
.sig svg { width: 34px; height: 34px; }
.nv { display: flex; align-items: center; gap: 0; }
.nv a { padding: 10px 18px; font-size: 14px; font-weight: 700; color: var(--ink); text-transform: uppercase; letter-spacing: .5px; border-left: 1px solid var(--line-soft); }
.nv a:first-child { border-left: none; }
.nv a:hover { background: var(--grey); }
.nv a.act { background: var(--black); color: #fff; }
.nv a.act:hover { background: var(--black); }
.nv .go { background: var(--acc); color: var(--black); cursor: pointer; border-left: 2px solid var(--black); }
.nv .go:hover { background: var(--acc-d); }

main { margin-top: var(--navh); }
.slab { padding: 100px 0; border-bottom: 2px solid var(--black); }
.slab-grey { background: var(--grey); }
.slab-black { background: var(--black); color: #d6d6d6; }

.tagn { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 800; letter-spacing: 2px; text-transform: uppercase; color: var(--black); border: 2px solid var(--black); padding: 5px 12px; }
.tagn.on-black { color: var(--acc); border-color: var(--acc); }
.bigh { font-size: 44px; font-weight: 900; color: var(--black); line-height: 1.05; letter-spacing: -1.5px; margin-top: 18px; text-transform: uppercase; }
.bigh .mk { background: var(--acc); padding: 0 6px; }
.deck { font-size: 18px; color: var(--body); margin-top: 16px; max-width: 720px; }
.cc { text-align: center; }
.cc .deck { margin-left: auto; margin-right: auto; }

/* Hero：超大字居中 */
.poster { padding: 96px 0 88px; text-align: center; position: relative; }
.poster .tagn { margin-bottom: 8px; }
.poster h1 { font-size: 88px; font-weight: 900; color: var(--black); line-height: .96; letter-spacing: -3.5px; text-transform: uppercase; margin: 22px auto 0; max-width: 1000px; }
.poster h1 .hl { background: var(--acc); padding: 0 10px; display: inline-block; }
.poster .lead { font-size: 21px; color: var(--body); max-width: 640px; margin: 26px auto 0; }
.poster .acts { display: flex; gap: 0; justify-content: center; margin-top: 38px; flex-wrap: wrap; }
.poster .acts .btn { border-right-width: 0; }
.poster .acts .btn:last-child { border-right-width: 2px; }
.poster .strip { margin-top: 40px; border-top: 2px solid var(--black); border-bottom: 2px solid var(--black); display: grid; grid-template-columns: repeat(3, 1fr); }
.poster .strip div { padding: 18px; border-left: 1px solid var(--line-soft); }
.poster .strip div:first-child { border-left: none; }
.poster .strip b { display: block; font-size: 26px; font-weight: 900; color: var(--black); }
.poster .strip span { font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: 1px; }

/* 亮点：极简编号大行 */
.bigrows { border-top: 2px solid var(--black); }
.bigrow { display: grid; grid-template-columns: 90px 1fr; gap: 30px; padding: 36px 0; border-bottom: 1px solid var(--line-soft); align-items: start; }
.bigrow .idx { font-size: 30px; font-weight: 900; color: var(--black); }
.bigrow .bbody { display: grid; grid-template-columns: 56px 1fr; gap: 22px; align-items: start; }
.bigrow .bi { width: 56px; height: 56px; border: 2px solid var(--black); display: flex; align-items: center; justify-content: center; color: var(--black); }
.bigrow .bi svg { width: 28px; height: 28px; }
.bigrow h3 { font-size: 24px; font-weight: 800; color: var(--black); margin-bottom: 8px; text-transform: uppercase; letter-spacing: -.5px; }
.bigrow p { font-size: 16px; color: var(--body); max-width: 720px; }

/* 功能：两栏带边框 */
.duo { display: grid; grid-template-columns: 1fr 1fr; border: 2px solid var(--black); }
.duo .cell { padding: 44px; border-right: 2px solid var(--black); border-bottom: 2px solid var(--black); }
.duo .cell:nth-child(2n) { border-right: none; }
.duo .cell:nth-last-child(-n+2) { border-bottom: none; }
.duo .cnum { font-size: 14px; font-weight: 800; letter-spacing: 2px; color: var(--acc-d); text-transform: uppercase; }
.duo h3 { font-size: 26px; font-weight: 900; color: var(--black); margin: 8px 0 14px; text-transform: uppercase; letter-spacing: -1px; }
.duo p { font-size: 16px; color: var(--body); margin-bottom: 16px; }
.duo li { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 10px; font-size: 15px; color: var(--ink); }
.duo li svg { width: 20px; height: 20px; color: var(--black); flex-shrink: 0; margin-top: 2px; }

/* 平台：四格大网格 */
.osquad { display: grid; grid-template-columns: repeat(4, 1fr); border: 2px solid var(--black); }
.oscell { padding: 40px 26px; border-right: 2px solid var(--black); text-align: left; }
.oscell:last-child { border-right: none; }
.oscell svg.oi { width: 44px; height: 44px; margin-bottom: 18px; }
.oscell h3 { font-size: 20px; font-weight: 900; color: var(--black); margin-bottom: 8px; text-transform: uppercase; }
.oscell p { font-size: 13.5px; color: var(--muted); min-height: 44px; margin-bottom: 20px; }
.oscell .btn { width: 100%; }

/* 数据：黑底大字 */
.bignum { display: grid; grid-template-columns: repeat(4, 1fr); border: 2px solid var(--acc); }
.bignum div { padding: 40px 20px; border-right: 1px solid #3a3a3a; text-align: center; }
.bignum div:last-child { border-right: none; }
.bignum b { display: block; font-size: 56px; font-weight: 900; color: var(--acc); line-height: 1; letter-spacing: -2px; }
.bignum span { font-size: 14px; color: #b6b6b6; margin-top: 12px; display: block; text-transform: uppercase; letter-spacing: 1px; }

/* 对比 */
.grid-tbl { width: 100%; border-collapse: collapse; border: 2px solid var(--black); }
.grid-tbl th, .grid-tbl td { padding: 16px 22px; text-align: left; border: 1px solid var(--line-soft); font-size: 15px; }
.grid-tbl thead th { background: var(--black); color: #fff; font-weight: 800; text-transform: uppercase; letter-spacing: 1px; font-size: 14px; }
.grid-tbl td:nth-child(2) { background: var(--acc); color: var(--black); font-weight: 700; }
.aff { font-weight: 800; color: var(--black); }
.neg { color: var(--muted); }

/* 评价 */
.saygrid { display: grid; grid-template-columns: repeat(3, 1fr); border: 2px solid var(--black); }
.say { padding: 30px; border-right: 2px solid var(--black); border-bottom: 2px solid var(--black); }
.say:nth-child(3n) { border-right: none; }
.say:nth-last-child(-n+3) { border-bottom: none; }
.say .sstars { display: flex; gap: 2px; color: var(--black); margin-bottom: 14px; }
.say .sstars svg { width: 15px; height: 15px; fill: currentColor; }
.say p { font-size: 15.5px; color: var(--ink); margin-bottom: 18px; }
.say .person { display: flex; align-items: center; gap: 12px; }
.say .person .mono { width: 42px; height: 42px; border: 2px solid var(--black); display: flex; align-items: center; justify-content: center; font-weight: 900; color: var(--black); }
.say .person b { display: block; font-size: 14.5px; color: var(--black); }
.say .person span { font-size: 12.5px; color: var(--muted); text-transform: uppercase; letter-spacing: .5px; }

/* FAQ */
.qlist { border-top: 2px solid var(--black); }
.qlist details { border-bottom: 1px solid var(--line-soft); }
.qlist summary { cursor: pointer; list-style: none; padding: 24px 4px; font-weight: 800; font-size: 19px; color: var(--black); display: flex; justify-content: space-between; align-items: center; gap: 16px; text-transform: uppercase; letter-spacing: -.3px; }
.qlist summary::-webkit-details-marker { display: none; }
.qlist summary::after { content: "+"; font-size: 28px; font-weight: 400; color: var(--black); transition: transform .15s ease; }
.qlist details[open] summary::after { transform: rotate(45deg); color: var(--acc-d); }
.qlist .ra { padding: 0 4px 24px; font-size: 16px; color: var(--body); max-width: 820px; }

/* 下载页 */
.dlposter { padding: 80px 0; border-bottom: 2px solid var(--black); }
.dlposter h1 { font-size: 64px; font-weight: 900; color: var(--black); line-height: 1; letter-spacing: -2.5px; text-transform: uppercase; margin: 18px 0; }
.specline { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 2px solid var(--black); border-bottom: 2px solid var(--black); margin: 24px 0; }
.specline div { padding: 16px 18px; border-left: 1px solid var(--line-soft); }
.specline div:first-child { border-left: none; }
.specline span { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 1px; display: block; }
.specline b { font-size: 18px; font-weight: 900; color: var(--black); }

.guard { border: 2px solid var(--black); padding: 30px; background: var(--acc); }
.guard h3 { font-size: 20px; font-weight: 900; color: var(--black); margin: 8px 0 12px; text-transform: uppercase; }
.guard li { display: flex; gap: 9px; align-items: flex-start; font-size: 14.5px; color: var(--black); margin-bottom: 10px; font-weight: 500; }
.guard svg { width: 18px; height: 18px; color: var(--black); flex-shrink: 0; margin-top: 3px; }

.proc { counter-reset: pc; border-top: 2px solid var(--black); }
.procrow { counter-increment: pc; display: grid; grid-template-columns: 70px 1fr; gap: 24px; padding: 28px 0; border-bottom: 1px solid var(--line-soft); }
.procrow::before { content: counter(pc, decimal-leading-zero); font-size: 28px; font-weight: 900; color: var(--black); }
.procrow h4 { font-size: 19px; font-weight: 800; color: var(--black); margin-bottom: 6px; text-transform: uppercase; letter-spacing: -.3px; }
.procrow p { font-size: 15.5px; color: var(--body); }

.sysquad { display: grid; grid-template-columns: repeat(2, 1fr); border: 2px solid var(--black); }
.syscell { padding: 28px; border-right: 2px solid var(--black); border-bottom: 2px solid var(--black); }
.syscell:nth-child(2n) { border-right: none; }
.syscell:nth-last-child(-n+2) { border-bottom: none; }
.syscell h4 { font-size: 18px; font-weight: 900; color: var(--black); margin-bottom: 14px; text-transform: uppercase; display: flex; align-items: center; gap: 8px; }
.syscell svg { width: 22px; height: 22px; }
.syscell table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.syscell td { padding: 8px 0; border-bottom: 1px solid var(--line-soft); }
.syscell td:first-child { color: var(--muted); width: 38%; text-transform: uppercase; letter-spacing: .5px; font-size: 12.5px; }
.syscell td:last-child { color: var(--black); font-weight: 600; }
.syscell tr:last-child td { border-bottom: none; }

.timeb { border-top: 2px solid var(--black); }
.timerow { display: grid; grid-template-columns: 180px 1fr; gap: 28px; padding: 26px 0; border-bottom: 1px solid var(--line-soft); }
.timerow .vb b { font-size: 22px; font-weight: 900; color: var(--black); display: block; }
.timerow .vb time { font-size: 13px; color: var(--muted); }
.timerow li { display: flex; gap: 10px; font-size: 15px; color: var(--body); margin-bottom: 7px; }
.timerow li::before { content: "—"; color: var(--acc-d); font-weight: 800; }

/* 中文页 */
.mono-doc { max-width: 800px; margin: 0 auto; }
.mono-doc h2 { font-size: 30px; font-weight: 900; color: var(--black); margin: 40px 0 14px; text-transform: uppercase; letter-spacing: -1px; line-height: 1.1; }
.mono-doc h3 { font-size: 20px; font-weight: 800; color: var(--black); margin: 26px 0 10px; }
.mono-doc p { font-size: 17px; color: var(--body); margin-bottom: 16px; }
.mono-doc p strong { color: var(--black); background: var(--acc); padding: 0 3px; }
.mono-doc ul.bars { margin: 8px 0 18px; border-top: 1px solid var(--line-soft); }
.mono-doc ul.bars li { padding: 12px 0 12px 26px; border-bottom: 1px solid var(--line-soft); position: relative; font-size: 16px; }
.mono-doc ul.bars li::before { content: ""; position: absolute; left: 0; top: 19px; width: 14px; height: 3px; background: var(--black); }
.bigcta { margin-top: 50px; border: 2px solid var(--black); background: var(--black); color: #fff; padding: 50px 30px; text-align: center; }
.bigcta h3 { font-size: 30px; font-weight: 900; color: #fff; margin-bottom: 10px; text-transform: uppercase; letter-spacing: -1px; }
.bigcta p { color: #b6b6b6; margin-bottom: 24px; }
.bigcta a { display: inline-flex; align-items: center; gap: 8px; background: var(--acc); color: var(--black); font-weight: 800; padding: 15px 36px; border: 2px solid var(--acc); text-transform: uppercase; letter-spacing: 1px; }
.bigcta a:hover { background: transparent; color: var(--acc); }

/* 页脚 */
.foot6 { background: var(--paper); padding: 56px 0 30px; border-top: 2px solid var(--black); }
.foot6 .frame { text-align: center; display: flex; flex-direction: column; align-items: center; }
.safe6 { display: inline-flex; align-items: center; gap: 8px; background: var(--acc); color: var(--black); border: 2px solid var(--black); padding: 10px 22px; font-weight: 800; font-size: 14.5px; text-transform: uppercase; letter-spacing: .5px; }
.safe6 svg { width: 18px; height: 18px; }
.warn6 { margin: 22px 0; line-height: 1.8; color: var(--muted); font-size: 14px; max-width: 800px; }
.copy6 { border-top: 1px solid var(--line-soft); padding-top: 22px; color: var(--muted); font-size: 13px; width: 100%; text-transform: uppercase; letter-spacing: 1px; }

@media (max-width: 940px) {
  .duo, .saygrid { grid-template-columns: 1fr; }
  .duo .cell { border-right: none; }
  .say { border-right: none; }
  .osquad { grid-template-columns: 1fr 1fr; }
  .oscell:nth-child(2n) { border-right: none; }
  .bignum, .specline { grid-template-columns: 1fr 1fr; }
  .sysquad { grid-template-columns: 1fr; }
  .syscell { border-right: none; }
}
@media (max-width: 600px) {
  .slab, .poster { padding: 60px 0; }
  .poster h1 { font-size: 48px; letter-spacing: -2px; }
  .bigh { font-size: 32px; }
  .dlposter h1 { font-size: 40px; }
  .osquad { grid-template-columns: 1fr; }
  .oscell { border-right: none; border-bottom: 2px solid var(--black); }
  .oscell:last-child { border-bottom: none; }
  .bignum { grid-template-columns: 1fr; }
  .bignum div { border-right: none; border-bottom: 1px solid #3a3a3a; }
  .poster .strip { grid-template-columns: 1fr; }
  .poster .strip div { border-left: none; border-top: 1px solid var(--line-soft); }
  .nv a:not(.go) { padding: 8px 9px; font-size: 11px; letter-spacing: 0; }
  .nv .go { display: none; }
  .sig span { display: none; }
  .bigrow { grid-template-columns: 1fr; gap: 14px; }
  .bigrow .bbody { grid-template-columns: 1fr; }
  .timerow, .procrow { grid-template-columns: 1fr; gap: 10px; }
}