/* 拓义官网：和应用同一套石灰色 + 墨色，蓝色只给动作和品牌标记。 */
:root {
  --bg: #f7f6f3;
  --bg-2: #efedе8;
  --panel: #ffffff;
  --ink: #1c1917;
  --ink-2: #44403c;
  --muted: #78716c;
  --faint: #a8a29e;
  --line: #e7e5e4;
  --line-2: #d6d3d1;
  --accent: #2563eb;
  --accent-soft: #dbeafe;
  --mark: #60a5fa;
  --dark: #1c1917;
  --dark-2: #292524;
  --radius: 14px;
  --max: 1120px;
  --serif: "Noto Serif SC", "Songti SC", "STSong", serif;
  --sans: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Helvetica Neue", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, monospace;
}
:root { --bg-2: #efede8; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .rise { animation: none !important; opacity: 1 !important; } }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--sans); font-size: 16px; line-height: 1.7; -webkit-font-smoothing: antialiased; padding-inline: 20px; }
a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
img { max-width: 100%; height: auto; display: block; }
.wrap { max-width: var(--max); margin: 0 auto; }
.eyebrow { font-family: var(--mono); font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
h1, h2, h3 { margin: 0; text-wrap: balance; }
h2 { font-family: var(--serif); font-weight: 600; font-size: clamp(26px, 3.2vw, 36px); line-height: 1.25; letter-spacing: -.01em; }
h3 { font-size: 17px; font-weight: 600; line-height: 1.4; }
p { margin: 0; }
.muted { color: var(--muted); }
.rise { animation: rise .7s cubic-bezier(.2,.7,.2,1) both; }
@keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

/* 顶栏 */
.nav { display: flex; align-items: center; gap: 28px; padding-block: 22px 8px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; }
.brand img { width: 28px; height: 28px; border-radius: 8px; }
.brand small { font-weight: 400; color: var(--muted); font-size: 13px; margin-left: 2px; }
.nav-links { margin-left: auto; display: flex; gap: 22px; font-size: 14px; color: var(--ink-2); }
.nav-links a:hover { color: var(--ink); }
.nav .cta { font-size: 14px; }
@media (max-width: 720px) { .nav-links { display: none; } }

/* 按钮 */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 11px 18px; border-radius: 10px; font-weight: 600; font-size: 15px; line-height: 1; border: 1px solid transparent; transition: background .15s, border-color .15s, transform .15s; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: #292524; }
.btn-ghost { background: transparent; border-color: var(--line-2); color: var(--ink); }
.btn-ghost:hover { background: #fff; border-color: var(--faint); }
.btn small { font-weight: 400; opacity: .7; }

/* 首屏 */
.hero { padding-block: 64px 40px; display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 48px; align-items: center; }
.hero h1 { font-family: var(--serif); font-weight: 700; font-size: clamp(38px, 5.4vw, 62px); line-height: 1.16; letter-spacing: -.015em; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero .lede { margin-top: 20px; font-size: 18px; color: var(--ink-2); max-width: 30em; }
.hero .actions { margin-top: 30px; display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.hero .fine { margin-top: 14px; font-size: 13px; color: var(--muted); }
@media (max-width: 900px) { .hero { grid-template-columns: 1fr; gap: 36px; padding-block: 44px 24px; } }

/* 首屏右侧：用 CSS 画的应用三栏缩影 */
.mock { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 1px 2px rgba(28,25,23,.05), 0 24px 48px -24px rgba(28,25,23,.25); overflow: hidden; font-size: 11px; line-height: 1.45; color: var(--ink-2); aspect-ratio: 16 / 10.4; display: grid; grid-template-columns: 118px minmax(0, 1fr) minmax(0, .95fr); }
.mock .side { background: #fafaf9; border-right: 1px solid var(--line); padding: 12px 10px; display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.mock .side .t { font-weight: 700; font-size: 12px; color: var(--ink); display: flex; align-items: center; gap: 6px; }
.mock .side .t i { width: 14px; height: 14px; border-radius: 4px; background: var(--ink); display: inline-block; }
.mock .side .g { margin-top: 8px; font-size: 9px; letter-spacing: .08em; color: var(--faint); text-transform: uppercase; }
.mock .side .row { display: flex; align-items: center; gap: 6px; padding: 4px 6px; border-radius: 6px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mock .side .row.on { background: var(--ink); color: #fff; }
.mock .side .row b { width: 5px; height: 5px; border-radius: 50%; background: var(--faint); flex: none; }
.mock .side .row.on b { background: #fff; }
.mock .side .row.done b { background: var(--ink); }
.mock .mid { display: flex; flex-direction: column; min-width: 0; border-right: 1px solid var(--line); }
.mock .video { aspect-ratio: 16 / 9; background: linear-gradient(135deg, #f5f5f4, #d6d3d1); position: relative; }
.mock .video::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--ink); }
.mock .video .slide { position: absolute; left: 14%; top: 22%; font-family: var(--serif); font-size: clamp(11px, 1.6vw, 18px); font-weight: 700; color: var(--ink); line-height: 1.2; }
.mock .video .slide small { display: block; font-family: var(--sans); font-weight: 400; font-size: .6em; color: var(--muted); margin-top: 4px; }
.mock .video .bar { position: absolute; left: 10px; right: 10px; bottom: 8px; height: 2px; background: rgba(28,25,23,.15); }
.mock .video .bar i { display: block; height: 100%; width: 38%; background: var(--ink); }
.mock .subs { padding: 8px 10px; display: flex; flex-direction: column; gap: 5px; overflow: hidden; }
.mock .sub { display: grid; grid-template-columns: 28px 1fr; gap: 6px; padding: 4px 6px; border-radius: 6px; border-left: 2px solid transparent; }
.mock .sub.on { background: #eff6ff; border-left-color: var(--accent); }
.mock .sub .tm { font-family: var(--mono); font-size: 9px; color: var(--faint); padding-top: 1px; }
.mock .sub.on .tm { color: var(--accent); }
.mock .sub .zh { display: block; color: var(--faint); font-size: 10px; }
.mock .notes { padding: 12px 14px; overflow: hidden; }
.mock .notes .tabs { display: flex; gap: 12px; font-size: 10px; color: var(--muted); border-bottom: 1px solid var(--line); padding-bottom: 6px; margin-bottom: 10px; }
.mock .notes .tabs b { color: var(--ink); font-weight: 600; }
.mock .notes h4 { margin: 0 0 6px; font-size: 13px; color: var(--ink); }
.mock .notes p, .mock .notes li { margin: 0 0 4px; font-size: 10.5px; color: var(--ink-2); }
.mock .notes ul { margin: 0; padding-left: 14px; }
.mock .notes .fig { margin: 8px 0; height: 44px; border-radius: 6px; background: linear-gradient(135deg, #e7e5e4, #d6d3d1); border: 1px solid var(--line); position: relative; }
.mock .notes .fig::after { content: "关键帧 04:12"; position: absolute; right: 6px; bottom: 4px; font-family: var(--mono); font-size: 8px; color: var(--muted); }
@media (max-width: 560px) { .mock { grid-template-columns: minmax(0, 1fr) minmax(0, .95fr); } .mock .side { display: none; } }

/* 通用分节 */
.section { padding-block: 64px; border-top: 1px solid var(--line); }
.section-head { max-width: 40em; margin-bottom: 36px; }
.section-head p { margin-top: 12px; color: var(--ink-2); font-size: 16px; }

/* 流程 */
.steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; counter-reset: step; }
.step { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 20px 22px; position: relative; }
.step::before { counter-increment: step; content: counter(step, decimal-leading-zero); font-family: var(--mono); font-size: 12px; color: var(--faint); }
.step h3 { margin-top: 10px; }
.step p { margin-top: 8px; font-size: 14px; color: var(--ink-2); }
@media (max-width: 900px) { .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 520px) { .steps { grid-template-columns: 1fr; } }

/* 特性 */
.features { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--panel); }
.feature { padding: 26px 24px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.feature:nth-child(3n) { border-right: 0; }
.feature:nth-last-child(-n+3) { border-bottom: 0; }
.feature .ic { width: 34px; height: 34px; border-radius: 9px; background: #f5f5f4; border: 1px solid var(--line); display: grid; place-items: center; color: var(--ink); margin-bottom: 14px; }
.feature p { margin-top: 8px; font-size: 14px; color: var(--ink-2); }
.feature code { font-family: var(--mono); font-size: 12px; background: #f5f5f4; border: 1px solid var(--line); border-radius: 5px; padding: 1px 5px; color: var(--ink); }
@media (max-width: 900px) { .features { grid-template-columns: repeat(2, minmax(0, 1fr)); } .feature:nth-child(3n) { border-right: 1px solid var(--line); } .feature:nth-child(2n) { border-right: 0; } .feature:nth-last-child(-n+3) { border-bottom: 1px solid var(--line); } .feature:nth-last-child(-n+2) { border-bottom: 0; } }
@media (max-width: 560px) { .features { grid-template-columns: 1fr; } .feature { border-right: 0 !important; border-bottom: 1px solid var(--line) !important; } .feature:last-child { border-bottom: 0 !important; } }

/* 截图 */
.shots { display: grid; gap: 28px; }
.shot { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: 0 1px 2px rgba(28,25,23,.05), 0 20px 40px -28px rgba(28,25,23,.3); }
.shot figcaption { padding: 14px 18px; font-size: 14px; color: var(--ink-2); border-top: 1px solid var(--line); display: flex; gap: 10px; align-items: baseline; }
.shot figcaption b { color: var(--ink); font-weight: 600; }
.shots-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 820px) { .shots-2 { grid-template-columns: 1fr; } }

/* 识别与隐私 */
.providers { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 36px; align-items: start; }
.table { width: 100%; border-collapse: collapse; font-size: 14px; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.table th, .table td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
.table th { font-weight: 600; color: var(--muted); font-size: 12px; letter-spacing: .04em; background: #fafaf9; }
.table tr:last-child td { border-bottom: 0; }
.table td:first-child { font-weight: 600; white-space: nowrap; }
.pill { display: inline-block; font-size: 11px; padding: 2px 8px; border-radius: 999px; border: 1px solid var(--line-2); color: var(--ink-2); margin-left: 6px; vertical-align: 1px; }
.privacy { display: flex; flex-direction: column; gap: 18px; }
.privacy .item { display: grid; grid-template-columns: 26px 1fr; gap: 12px; }
.privacy .item i { width: 26px; height: 26px; border-radius: 8px; background: var(--ink); color: #fff; display: grid; place-items: center; font-size: 12px; font-weight: 700; }
.privacy .item p { font-size: 14px; color: var(--ink-2); margin-top: 2px; }
@media (max-width: 820px) { .providers { grid-template-columns: 1fr; } }

/* 插件 */
.plugins { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.plugin { background: var(--dark); color: #e7e5e4; border-radius: var(--radius); padding: 26px 26px 24px; display: flex; flex-direction: column; gap: 10px; min-height: 100%; }
.plugin .eyebrow { color: #a8a29e; }
.plugin h3 { color: #fff; font-size: 20px; }
.plugin p { font-size: 14px; color: #d6d3d1; }
.plugin .meta { margin-top: auto; padding-top: 14px; display: flex; flex-wrap: wrap; gap: 8px; }
.plugin .meta span { font-family: var(--mono); font-size: 11px; border: 1px solid #44403c; border-radius: 999px; padding: 3px 9px; color: #a8a29e; }
.plugin .meta span.on { border-color: var(--mark); color: var(--mark); }
@media (max-width: 720px) { .plugins { grid-template-columns: 1fr; } }

/* 两种用法 */
.ways { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.way { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
.way h3 { font-size: 20px; }
.way p { margin-top: 8px; font-size: 14px; color: var(--ink-2); }
.way ul { margin: 14px 0 0; padding-left: 18px; font-size: 14px; color: var(--ink-2); }
.way li { margin-bottom: 4px; }
@media (max-width: 720px) { .ways { grid-template-columns: 1fr; } }

/* 下载 */
.download { background: var(--panel); border: 1px solid var(--line); border-radius: 18px; padding: 40px; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 28px; align-items: center; }
.download h2 { font-size: clamp(24px, 3vw, 32px); }
.download .spec { margin-top: 10px; font-family: var(--mono); font-size: 12px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 6px 16px; }
.download .note { margin-top: 14px; font-size: 14px; color: var(--ink-2); max-width: 44em; }
.download .note code { font-family: var(--mono); font-size: 12.5px; background: #f5f5f4; border: 1px solid var(--line); border-radius: 5px; padding: 1px 5px; }
.download .actions { display: flex; flex-direction: column; gap: 10px; align-items: stretch; }
@media (max-width: 720px) { .download { grid-template-columns: 1fr; padding: 28px 22px; } }

/* 页脚 */
.footer { padding-block: 36px 48px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 12px 28px; align-items: center; font-size: 13px; color: var(--muted); }
.footer .brand { font-size: 14px; }
.footer .brand img { width: 20px; height: 20px; border-radius: 6px; }
.footer a:hover { color: var(--ink); }
.footer .right { margin-left: auto; display: flex; gap: 18px; }