/* ============================================================
   YOLOFFY 官网 — AI Aurora（轻燃光晕 · AI 产品感）
   品牌真源：Warm Performance Editorial
   暖白底盘 / 品牌渐变 #8426D6→#C238A1→#FF6537 /
   近黑行动层 #111 / 紫色 AI 工具强调 #4418BE
   ============================================================ */
:root{
  --bg:#FAF9F7; --bg-warm:#F6F4F2; --card:#FFFFFF;
  --line:rgba(26,24,24,.08); --line-strong:rgba(26,24,24,.14);
  --ink:#1A1818; --ink-soft:#6B6664; --ink-faint:#9A9491;
  --action:#111111; --tool:#4418BE; --tool-soft:#7840CA;
  --grad:linear-gradient(135deg,#8426D6 0%,#C238A1 50%,#FF6537 100%);
  --radius:22px;
  --shadow:0 12px 34px rgba(40,25,10,.08);
  --shadow-soft:0 6px 18px rgba(40,25,10,.06);
  --mono:ui-monospace,"SF Mono",SFMono-Regular,Menlo,Consolas,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Segoe UI",Roboto,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.65;font-weight:450;
  -webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
.wrap{max-width:1080px;margin:0 auto;padding:0 28px}
.mono{font-family:var(--mono);font-size:11.5px;letter-spacing:1.6px;text-transform:uppercase;color:var(--ink-faint);font-weight:500}

/* ---------- Nav（悬浮胶囊） ---------- */
.nav{position:sticky;top:14px;z-index:50;margin:14px auto 0;max-width:860px;padding:0 20px}
.nav-pill{display:flex;align-items:center;justify-content:space-between;height:58px;padding:0 12px 0 22px;
  background:rgba(255,255,255,.78);-webkit-backdrop-filter:saturate(180%) blur(18px);backdrop-filter:saturate(180%) blur(18px);
  border:1px solid var(--line);border-radius:999px;box-shadow:var(--shadow-soft)}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;font-size:17px;letter-spacing:.5px}
.brand .dot{width:23px;height:23px;border-radius:7px;background:var(--grad)}
.nav-links{display:flex;align-items:center;gap:24px;font-size:14px;color:var(--ink-soft);font-weight:490}
.nav-links a:hover{color:var(--ink)}
.nav .cta-mini{padding:9px 18px;border-radius:999px;background:var(--action);color:#fff;font-size:13px;font-weight:540}
@media(max-width:760px){.nav-links a:not(.cta-mini){display:none}}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;border-radius:999px;
  font-weight:560;font-size:15px;transition:all .18s ease;cursor:pointer;border:none}
.btn:active{transform:scale(.97)}
.btn-dark{background:var(--action);color:#fff}
.btn-dark:hover{box-shadow:0 10px 26px rgba(0,0,0,.2);transform:translateY(-1px)}
.btn-ghost{background:rgba(255,255,255,.7);border:1px solid var(--line-strong);color:var(--ink)}
.btn-ghost:hover{background:#fff}

/* ---------- Aurora 背景 ---------- */
.aurora{position:absolute;inset:0;overflow:hidden;pointer-events:none}
.aurora i{position:absolute;border-radius:50%;filter:blur(90px);opacity:.16;animation:drift 14s ease-in-out infinite alternate}
.aurora i:nth-child(1){width:560px;height:560px;background:#8426D6;top:-180px;left:-120px}
.aurora i:nth-child(2){width:480px;height:480px;background:#FF6537;top:-60px;right:-140px;animation-delay:-4s}
.aurora i:nth-child(3){width:420px;height:420px;background:#C238A1;top:320px;left:34%;opacity:.12;animation-delay:-8s}
@keyframes drift{from{transform:translate(0,0) scale(1)}to{transform:translate(36px,28px) scale(1.07)}}
.dots{position:absolute;inset:0;pointer-events:none;
  background-image:radial-gradient(rgba(26,24,24,.10) 1px,transparent 1px);
  background-size:26px 26px;
  -webkit-mask-image:radial-gradient(58% 52% at 50% 36%,#000 0%,transparent 100%);
  mask-image:radial-gradient(58% 52% at 50% 36%,#000 0%,transparent 100%)}

/* ---------- Hero ---------- */
.hero{position:relative;padding:108px 0 96px;text-align:center}
.hero .wrap{position:relative;z-index:1}
.chip{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:520;color:var(--ink-soft);
  background:rgba(255,255,255,.85);border:1px solid var(--line);border-radius:999px;padding:8px 16px;margin-bottom:30px;box-shadow:var(--shadow-soft)}
.chip b{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;font-weight:620}
.chip .sep{width:1px;height:12px;background:var(--line-strong)}
.hero h1{font-size:clamp(38px,6vw,72px);font-weight:630;line-height:1.08;letter-spacing:-2.2px;margin-bottom:20px}
.hero h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lead{font-size:17.5px;color:var(--ink-soft);max-width:560px;margin:0 auto 44px}
.hero .cta{margin-top:46px;display:flex;gap:14px;justify-content:center;flex-wrap:wrap;animation:rise .7s .45s ease both}
.hero .sub-note{margin-top:24px;font-size:12.5px;color:var(--ink-faint)}
@keyframes rise{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}

/* AI 输入框模拟 */
.ai-input{max-width:620px;margin:0 auto;position:relative;border-radius:20px;padding:1.5px;
  background:var(--grad);box-shadow:0 18px 50px rgba(132,38,214,.16);animation:rise .7s .15s ease both}
.ai-input .inner{background:#fff;border-radius:18.5px;display:flex;align-items:center;gap:14px;padding:18px 20px}
.ai-input .spark-ic{width:34px;height:34px;border-radius:11px;background:var(--grad);display:grid;place-items:center;flex-shrink:0;color:#fff;font-size:15px}
.ai-input .text{font-size:15.5px;color:var(--ink);text-align:left;flex:1;white-space:nowrap;overflow:hidden}
.ai-input .text::after{content:"";display:inline-block;width:2px;height:18px;background:var(--tool);vertical-align:-3px;margin-left:2px;animation:blink 1s step-end infinite}
.ai-input .go{width:38px;height:38px;border-radius:12px;background:var(--action);display:grid;place-items:center;color:#fff;flex-shrink:0;font-size:16px}
@keyframes blink{50%{opacity:0}}
.typing{display:inline-block;overflow:hidden;vertical-align:bottom;white-space:nowrap;animation:type 3.2s steps(18,end) .6s both}
@keyframes type{from{max-width:0}to{max-width:100%}}

/* 生成结果浮层 */
.gen-result{max-width:620px;margin:18px auto 0;background:rgba(255,255,255,.92);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  border:1px solid var(--line);border-radius:20px;padding:18px 20px;box-shadow:var(--shadow);
  display:flex;align-items:center;gap:16px;text-align:left;animation:rise .7s 3.9s ease both}
.gen-result .ok{width:40px;height:40px;border-radius:13px;background:rgba(68,24,190,.08);display:grid;place-items:center;color:var(--tool);font-size:18px;flex-shrink:0}
.gen-result .t{font-size:14.5px;font-weight:580}
.gen-result .s{font-size:12.5px;color:var(--ink-faint);font-family:var(--mono)}
.gen-result .open{margin-left:auto;font-size:13px;font-weight:560;color:var(--tool);flex-shrink:0}
.hero .examples{margin-top:30px;display:flex;gap:10px;justify-content:center;flex-wrap:wrap;animation:rise .7s .3s ease both}
.hero .examples span{font-size:12.5px;color:var(--ink-soft);border:1px solid var(--line);background:rgba(255,255,255,.7);border-radius:999px;padding:7px 14px;cursor:default;transition:all .18s}
.hero .examples span:hover{border-color:var(--tool);color:var(--tool)}
@media(max-width:560px){
  .hero{padding:84px 0 76px}
  .ai-input .inner{padding:14px 14px;gap:10px}
  .ai-input .text{font-size:13.5px}
  .gen-result{flex-wrap:wrap;gap:12px}
  .gen-result .open{margin-left:56px}
}

/* ---------- 跑马灯数据带 ---------- */
.ticker{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:rgba(255,255,255,.6);
  overflow:hidden;padding:18px 0;position:relative}
.ticker .track{display:flex;gap:64px;width:max-content;animation:scroll 26s linear infinite}
.ticker .item{display:flex;align-items:center;gap:10px;font-size:13.5px;color:var(--ink-soft);white-space:nowrap}
.ticker .item b{font-weight:620;color:var(--ink)}
.ticker .item::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--grad)}
@keyframes scroll{to{transform:translateX(-50%)}}

/* ---------- Section ---------- */
.section{padding:100px 0;position:relative}
.sec-head{text-align:center;margin-bottom:56px}
.sec-head .mono{display:block;margin-bottom:14px;color:var(--tool)}
.sec-head h2{font-size:clamp(28px,3.6vw,40px);font-weight:610;letter-spacing:-1px;margin-bottom:10px}
.sec-head p{color:var(--ink-soft);font-size:16.5px;max-width:540px;margin:0 auto}
@media(max-width:760px){.section{padding:72px 0}}

/* ---------- AI 对话全景卡 ---------- */
.showcase{position:relative;border-radius:30px;padding:1.5px;
  background:linear-gradient(135deg,rgba(132,38,214,.5),rgba(194,56,161,.3),rgba(255,101,55,.5));margin-top:18px}
.showcase .inner{background:#fff;border-radius:28.5px;padding:46px;display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
@media(max-width:860px){.showcase .inner{grid-template-columns:1fr;padding:28px;gap:32px}}
.showcase h3{font-size:24px;font-weight:610;letter-spacing:-.5px;margin:12px 0 12px}
.showcase p{color:var(--ink-soft);font-size:15px;margin-bottom:22px}
.showcase ul{list-style:none;display:flex;flex-direction:column;gap:12px}
.showcase li{display:flex;gap:12px;font-size:14.5px;color:var(--ink)}
.showcase li::before{content:"";width:18px;height:18px;border-radius:6px;flex-shrink:0;margin-top:3px;
  background:linear-gradient(135deg,rgba(132,38,214,.15),rgba(255,101,55,.15))}
.chatbox{background:var(--bg);border:1px solid var(--line);border-radius:20px;padding:20px;display:flex;flex-direction:column;gap:12px}
.chatbox .bub-u{align-self:flex-end;max-width:84%;background:var(--action);color:#fff;padding:11px 15px;border-radius:16px 16px 5px 16px;font-size:13.5px}
.chatbox .bub-a{align-self:flex-start;max-width:88%;background:#fff;border:1px solid var(--line);padding:12px 15px;border-radius:16px 16px 16px 5px;font-size:13.5px;color:var(--ink);box-shadow:var(--shadow-soft)}
.chatbox .bub-a .lbl{display:flex;align-items:center;gap:6px;font-family:var(--mono);font-size:10px;letter-spacing:1px;color:var(--tool);margin-bottom:6px}
.chatbox .bub-a .lbl::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--tool);animation:pulse 1.6s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.25}}

/* ---------- 功能卡 ---------- */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
@media(max-width:860px){.grid{grid-template-columns:1fr}}
.feature{background:rgba(255,255,255,.85);border:1px solid var(--line);
  border-radius:var(--radius);padding:30px;transition:all .22s ease;position:relative;overflow:hidden}
.feature:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:rgba(68,24,190,.2)}
.feature .ic{width:46px;height:46px;border-radius:14px;display:grid;place-items:center;margin-bottom:20px;
  background:var(--bg-warm);font-size:20px;color:var(--ink)}
.feature.ai .ic{background:linear-gradient(135deg,rgba(132,38,214,.10),rgba(255,101,55,.10));color:var(--tool)}
.feature h3{font-size:18px;font-weight:590;margin-bottom:8px;display:flex;align-items:center;gap:8px}
.feature h3 .ai-tag{font-family:var(--mono);font-size:9.5px;letter-spacing:1px;color:#fff;background:var(--grad);
  border-radius:999px;padding:3px 8px;font-weight:600}
.feature p{font-size:14.5px;color:var(--ink-soft)}

/* ---------- 三步（横向时间线） ---------- */
.timeline{display:grid;grid-template-columns:repeat(3,1fr);gap:0;position:relative}
@media(max-width:860px){.timeline{grid-template-columns:1fr;gap:36px}}
.tstep{padding:0 28px;position:relative;text-align:center}
.tstep .node{width:54px;height:54px;margin:0 auto 22px;border-radius:18px;background:#fff;border:1px solid var(--line);
  box-shadow:var(--shadow-soft);display:grid;place-items:center;font-family:var(--mono);font-size:13px;font-weight:600;position:relative;z-index:1}
.tstep:nth-child(2) .node{background:var(--grad);color:#fff;border:none}
.tstep::before{content:"";position:absolute;top:27px;left:calc(-50% + 27px);width:calc(100% - 54px);height:1px;
  background:linear-gradient(90deg,transparent,var(--line-strong),transparent)}
.tstep:first-child::before{display:none}
@media(max-width:860px){.tstep::before{display:none}}
.tstep h3{font-size:17px;font-weight:580;margin-bottom:6px}
.tstep p{font-size:14px;color:var(--ink-soft);max-width:240px;margin:0 auto}

/* ---------- 底部 CTA ---------- */
.cta-final{position:relative;text-align:center;padding:110px 0 120px;overflow:hidden}
.cta-final .aurora i{opacity:.14}
.cta-final h2{font-size:clamp(30px,4.6vw,52px);font-weight:630;letter-spacing:-1.6px;margin-bottom:14px;position:relative}
.cta-final h2 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.cta-final p{color:var(--ink-soft);font-size:16.5px;margin-bottom:36px;position:relative}
.cta-final .cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;position:relative}

/* ---------- Footer ---------- */
.footer{border-top:1px solid var(--line);padding:52px 0 40px;background:rgba(255,255,255,.65)}
.footer .cols{display:flex;justify-content:space-between;flex-wrap:wrap;gap:32px;margin-bottom:34px}
.footer h4{font-family:var(--mono);font-size:11px;letter-spacing:1.6px;text-transform:uppercase;color:var(--ink-faint);margin-bottom:14px;font-weight:540}
.footer .col a{display:block;color:var(--ink-soft);font-size:14.5px;margin-bottom:9px}
.footer .col a:hover{color:var(--ink)}
.footer .legal{border-top:1px solid var(--line);padding-top:24px;color:var(--ink-faint);font-size:13px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}
.footer .legal a{color:var(--ink-faint)}
.footer .legal a:hover{color:var(--ink)}
.footer.slim .legal{border:none;padding-top:0}

/* ---------- 内容页（support / privacy） ---------- */
.article-hero{position:relative;height:220px;margin-bottom:-150px;overflow:hidden;
  -webkit-mask-image:linear-gradient(#000 0%,transparent 100%);mask-image:linear-gradient(#000 0%,transparent 100%)}
.article-hero .aurora i{opacity:.12}
.article-hero .aurora i:nth-child(1){left:-60px}
.article-hero .aurora i:nth-child(2){right:-80px}
.article-hero .aurora i:nth-child(3){top:60px;left:40%}
.article{max-width:760px;margin:0 auto;padding:0 24px 88px;position:relative;z-index:1}
.article .back{color:var(--tool);font-size:14.5px;font-weight:530;display:inline-flex;align-items:center;gap:6px;margin-bottom:28px}
.article .back:hover{opacity:.75}
.article .eyebrow{display:block;margin-bottom:14px;color:var(--tool)}
.article h1{font-size:clamp(30px,4.6vw,40px);font-weight:620;letter-spacing:-1px;margin-bottom:10px}
.article .meta{color:var(--ink-faint);font-size:14px;margin-bottom:40px}
.article h2{font-size:21px;font-weight:600;letter-spacing:-.3px;margin:40px 0 14px;padding-top:26px;border-top:1px solid var(--line)}
.article h2:first-of-type{border-top:none;padding-top:0}
.article h3{font-size:16.5px;font-weight:580;margin:24px 0 8px}
.article p,.article li{color:#3a3633;font-size:15.5px;margin-bottom:10px}
.article ul,.article ol{padding-left:22px;margin-bottom:14px}
.article strong{font-weight:580}
.article .card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px 30px;box-shadow:var(--shadow-soft);margin:18px 0}
.article .card.tone{border-color:rgba(68,24,190,.16);background:linear-gradient(180deg,rgba(68,24,190,.03),rgba(255,255,255,1) 42%)}
.article a.inline{color:var(--tool);font-weight:520}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
  .typing{max-width:100%;animation:none}
  .ai-input,.gen-result,.hero .cta,.hero .examples{animation:none;opacity:1}
  .ticker .track{animation:none;width:auto;flex-wrap:wrap;justify-content:center;row-gap:10px}
  .aurora i{animation:none}
}