/* ===== 图片管家 ImageSteward 官网 · 共享样式 v7 ===== */
:root{
  --bg:#ffffff;
  --bg-soft:#f6f8fb;
  --bg-tint:#eef2ff;
  --ink:#0f172a;
  --ink-2:#334155;
  --ink-3:#64748b;
  --line:#e2e8f0;
  --brand:#6366f1;
  --brand-2:#8b5cf6;
  --brand-d:#4f46e5;
  --teal:#14b8a6;
  --amber:#f59e0b;
  --rose:#f43f5e;
  --ok:#10b981;
  --radius:16px;
  --radius-sm:10px;
  --shadow:0 10px 30px -12px rgba(15,23,42,.18);
  --shadow-sm:0 4px 14px -8px rgba(15,23,42,.25);
  --container:1140px;
  --font:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);
  line-height:1.65;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}
h1,h2,h3,h4{line-height:1.25;margin:0 0 .5em;font-weight:800;letter-spacing:-.01em}
p{margin:0 0 1em;color:var(--ink-2)}
.container{max-width:var(--container);margin:0 auto;padding:0 22px}
.muted{color:var(--ink-3)}
.center{text-align:center}
.brand-c{color:var(--brand)}

/* ---- 按钮 ---- */
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:700;font-size:15px;
  padding:12px 22px;border-radius:999px;border:1px solid transparent;cursor:pointer;
  transition:transform .15s ease,box-shadow .2s ease,background .2s ease;white-space:nowrap}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 12px 26px -12px rgba(99,102,241,.7)}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line);box-shadow:var(--shadow-sm)}
.btn-ghost:hover{border-color:var(--brand)}
.btn-lg{padding:15px 30px;font-size:16px}

/* ---- 顶部导航 ---- */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.82);
  backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;gap:18px;height:66px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px}
.logo .mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--brand),var(--brand-2));
  display:grid;place-items:center;color:#fff;box-shadow:0 6px 16px -6px rgba(99,102,241,.7)}
.logo small{display:block;font-size:11px;font-weight:600;color:var(--ink-3);letter-spacing:.08em}
.nav-links{display:flex;gap:4px;margin-left:auto}
.nav-links a{padding:8px 13px;border-radius:9px;font-size:14.5px;font-weight:600;color:var(--ink-2)}
.nav-links a:hover{background:var(--bg-soft);color:var(--ink)}
.nav-links a.active{color:var(--brand);background:var(--bg-tint)}
.nav-cta{margin-left:6px}
.nav-toggle{display:none;margin-left:auto;background:none;border:1px solid var(--line);
  border-radius:9px;width:42px;height:40px;cursor:pointer;align-items:center;justify-content:center}
.nav-toggle span{width:18px;height:2px;background:var(--ink);position:relative}
.nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--ink)}
.nav-toggle span::before{top:-6px}.nav-toggle span::after{top:6px}

/* ---- Hero ---- */
.hero{position:relative;overflow:hidden;padding:74px 0 54px;
  background:radial-gradient(1200px 500px at 80% -10%,rgba(139,92,246,.16),transparent 60%),
             radial-gradient(900px 420px at 0% 10%,rgba(20,184,166,.12),transparent 55%)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:46px;align-items:center}
.badge{display:inline-flex;align-items:center;gap:7px;background:#fff;border:1px solid var(--line);
  padding:6px 13px;border-radius:999px;font-size:13px;font-weight:600;color:var(--ink-2);box-shadow:var(--shadow-sm)}
.badge .dot{width:8px;height:8px;border-radius:50%;background:var(--ok)}
.hero h1{font-size:clamp(30px,4.6vw,50px);margin:18px 0 14px}
.hero p.lead{font-size:18px;color:var(--ink-2);max-width:30em}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-top:8px}
.hero-note{margin-top:14px;font-size:13px;color:var(--ink-3)}

/* ---- 数据条 ---- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 26px;box-shadow:var(--shadow);margin-top:38px}
.stat{text-align:center}
.stat .n{font-size:30px;font-weight:800;background:linear-gradient(135deg,var(--brand),var(--brand-2));
  -webkit-background-clip:text;background-clip:text;color:transparent}
.stat .l{font-size:13.5px;color:var(--ink-3);font-weight:600}

/* ---- 区块通用 ---- */
section.block{padding:66px 0}
.section-head{max-width:680px;margin:0 auto 40px;text-align:center}
.section-head .kicker{font-size:13px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--brand)}
.section-head h2{font-size:clamp(24px,3.2vw,34px);margin:10px 0 8px}
.section-head p{font-size:16px}

/* ---- 卡片栅格 ---- */
.grid{display:grid;gap:20px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;
  box-shadow:var(--shadow-sm);transition:transform .18s ease,box-shadow .2s ease,border-color .2s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#cdd6f4}
.card .ic{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;margin-bottom:14px;
  background:var(--bg-tint);color:var(--brand)}
.card h3{font-size:18px;margin-bottom:6px}
.card p{font-size:14.5px;margin:0;color:var(--ink-3)}

/* ---- 工作流 ---- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;counter-reset:s}
.step{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:26px;position:relative}
.step .num{counter-increment:s;width:38px;height:38px;border-radius:50%;display:grid;place-items:center;
  font-weight:800;color:#fff;background:linear-gradient(135deg,var(--brand),var(--brand-2));margin-bottom:14px}
.step .num::before{content:counter(s)}
.step h3{font-size:17px}
.step p{font-size:14.5px;color:var(--ink-3);margin:0}

/* ---- CTA 带 ---- */
.cta-band{background:linear-gradient(135deg,var(--brand-d),var(--brand-2));color:#fff;border-radius:24px;
  padding:48px;text-align:center;box-shadow:var(--shadow)}
.cta-band h2{color:#fff;font-size:clamp(22px,3vw,30px)}
.cta-band p{color:rgba(255,255,255,.85);max-width:46em;margin:0 auto 22px}
.cta-band .btn-ghost{background:#fff;color:var(--brand-d)}

/* ---- 页脚 ---- */
.footer{background:#0f172a;color:#cbd5e1;padding:54px 0 30px;margin-top:30px}
.footer a{color:#cbd5e1}
.footer a:hover{color:#fff}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px}
.footer .logo{color:#fff}
.footer .logo small{color:#94a3b8}
.footer h4{color:#fff;font-size:14px;letter-spacing:.04em;margin-bottom:14px}
.footer ul{list-style:none;padding:0;margin:0;display:grid;gap:9px;font-size:14px}
.footer-bottom{border-top:1px solid #1e293b;margin-top:36px;padding-top:20px;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px;color:#94a3b8}

/* ---- 功能页细节 ---- */
.feat{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.feat .card{display:flex;gap:16px;align-items:flex-start}
.feat .ic{flex:0 0 auto;margin-bottom:0}
.tag{display:inline-block;font-size:12px;font-weight:700;color:var(--brand);background:var(--bg-tint);
  padding:3px 10px;border-radius:999px;margin-top:8px}

/* ---- 截图画廊 ---- */
.gallery{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.shot{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow-sm);transition:transform .18s ease,box-shadow .2s}
.shot:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.shot .cap{padding:16px 18px}
.shot .cap h3{font-size:16px;margin-bottom:4px}
.shot .cap p{font-size:13.5px;color:var(--ink-3);margin:0}
.shot .frame{border-bottom:1px solid var(--line);background:var(--bg-soft)}
.shot.wide{grid-column:1 / -1}

/* ---- 下载页 ---- */
.dl-card{display:grid;grid-template-columns:1.2fr 1fr;gap:0;border:1px solid var(--line);border-radius:20px;
  overflow:hidden;box-shadow:var(--shadow);background:#fff}
.dl-main{padding:34px}
.dl-main .ver{display:inline-flex;align-items:center;gap:8px;font-weight:800;color:var(--brand);font-size:15px}
.dl-main h2{font-size:26px;margin:12px 0 6px}
.dl-main .meta{display:flex;gap:18px;flex-wrap:wrap;font-size:13.5px;color:var(--ink-3);margin:14px 0 20px}
.dl-main .meta b{color:var(--ink)}
.dl-side{background:var(--bg-soft);padding:34px;border-left:1px solid var(--line)}
.dl-side h4{font-size:14px;color:var(--ink-3);text-transform:uppercase;letter-spacing:.08em;margin-bottom:12px}
.dl-side ul{list-style:none;padding:0;margin:0 0 18px;display:grid;gap:10px;font-size:14px;color:var(--ink-2)}
.dl-side li{display:flex;gap:9px;align-items:flex-start}
.dl-side li svg{flex:0 0 auto;color:var(--ok);margin-top:3px}
.req-table{width:100%;border-collapse:collapse;margin-top:8px;font-size:14.5px}
.req-table th,.req-table td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line)}
.req-table th{color:var(--ink-3);font-weight:600;width:34%}
.steps-list{list-style:none;counter-reset:st;padding:0;margin:18px 0 0;display:grid;gap:14px}
.steps-list li{counter-increment:st;position:relative;padding-left:44px;font-size:15px;color:var(--ink-2)}
.steps-list li::before{content:counter(st);position:absolute;left:0;top:0;width:30px;height:30px;border-radius:8px;
  background:var(--bg-tint);color:var(--brand);font-weight:800;display:grid;place-items:center}

/* ---- FAQ ---- */
.faq{display:grid;gap:12px;max-width:840px;margin:0 auto}
.faq details{border:1px solid var(--line);border-radius:12px;background:#fff;padding:4px 18px;
  box-shadow:var(--shadow-sm)}
.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:"+";font-size:22px;color:var(--brand);font-weight:400}
.faq details[open] summary::after{content:"−"}
.faq .ans{padding:0 0 16px;color:var(--ink-3);font-size:14.5px}

/* ---- 关于 / 时间线 ---- */
.timeline{position:relative;max-width:860px;margin:0 auto;padding-left:26px}
.timeline::before{content:"";position:absolute;left:7px;top:6px;bottom:6px;width:2px;background:var(--line)}
.tl-item{position:relative;padding:0 0 26px 22px}
.tl-item::before{content:"";position:absolute;left:-23px;top:5px;width:14px;height:14px;border-radius:50%;
  background:#fff;border:3px solid var(--brand)}
.tl-item.hot::before{border-color:var(--brand-2);background:var(--brand-2);box-shadow:0 0 0 5px rgba(139,92,246,.18)}
.tl-item .v{font-weight:800;color:var(--ink)}
.tl-item .d{font-size:13px;color:var(--ink-3)}
.tl-item p{margin:4px 0 0;font-size:14.5px;color:var(--ink-2)}

/* ---- 徽章行 ---- */
.tech-row{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:10px}
.tech-row .chip{background:#fff;border:1px solid var(--line);border-radius:999px;padding:7px 15px;font-size:13.5px;font-weight:600;color:var(--ink-2)}

/* ---- 提示 ---- */
.note{background:var(--bg-tint);border:1px solid #c7d2fe;color:#3730a3;border-radius:12px;padding:14px 18px;font-size:14px}
.note.ok{background:#ecfdf5;border-color:#a7f3d0;color:#065f46}

/* ---- 单页锚点区块 ---- */
.sec{scroll-margin-top:78px}
.sec-soft{background:var(--bg-soft)}
.prose{max-width:820px}
.prose h3{font-size:16px;margin:24px 0 6px}
.prose p,.prose li{font-size:14.5px;color:var(--ink-3)}
.prose ul{padding-left:20px;margin:0 0 12px}
.prose ul li{margin-bottom:7px}
.prose strong{color:var(--ink-2)}
.kbd{background:#f1f5f9;border:1px solid var(--line);border-radius:6px;
  padding:1px 6px;font-size:13px;font-family:ui-monospace,Consolas,monospace}

/* ---- 响应式 ---- */
@media (max-width:920px){
  .hero-grid{grid-template-columns:1fr;gap:30px}
  .stats{grid-template-columns:repeat(2,1fr)}
  .grid-3,.grid-2,.feat,.gallery{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .dl-card{grid-template-columns:1fr}
  .dl-side{border-left:none;border-top:1px solid var(--line)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .nav-links{position:absolute;top:66px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);
    flex-direction:column;padding:10px 16px;gap:2px;display:none}
  .nav-links.open{display:flex}
  .nav-cta{display:none}
  .nav-luca{display:none}
  .nav-toggle{display:flex}
}
@media (max-width:560px){
  .footer-grid{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr 1fr}
}

/* ===== v9 追加：返回LUCA / 截图轮播 ===== */
/* 与「免费下载」完全同规格的胶囊按钮（同内边距/字号/投影），仅间距收紧 */
.nav-luca{display:inline-flex;align-items:center;gap:8px;margin-left:4px;font-size:15px;font-weight:700;
  padding:12px 22px;border-radius:999px;text-decoration:none;color:#fff;white-space:nowrap;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  box-shadow:0 12px 26px -12px rgba(99,102,241,.7);
  transition:transform .15s ease,box-shadow .2s ease,background .2s ease}
.nav-luca:hover{transform:translateY(-2px);color:#fff}
.nav-luca svg{opacity:.85}

.carousel{max-width:860px;margin:0 auto;background:#fff;border:1px solid var(--line);
  border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.car-viewport{overflow:hidden}
.car-track{display:flex;transition:transform .5s ease}
.car-slide{min-width:100%;margin:0}
.car-slide .frame{background:var(--bg-soft)}
.car-slide .frame img{display:block;width:100%;height:auto}
.car-slide .cap{padding:16px 20px;border-top:1px solid var(--line)}
.car-slide .cap h3{font-size:16px;margin:0 0 4px}
.car-slide .cap p{font-size:13.5px;color:var(--ink-3);margin:0}
.car-ctrl{display:flex;align-items:center;justify-content:center;gap:18px;padding:12px;border-top:1px solid var(--line)}
.car-btn{width:34px;height:34px;border-radius:50%;border:1px solid var(--line);background:#fff;color:var(--ink-2);
  cursor:pointer;display:flex;align-items:center;justify-content:center;transition:.2s}
.car-btn:hover{border-color:var(--brand);color:var(--brand)}
.car-dots{display:flex;gap:8px}
.car-dot{width:8px;height:8px;border-radius:50%;background:var(--line);border:0;cursor:pointer;padding:0;transition:.2s}
.car-dot.on{background:var(--brand);transform:scale(1.25)}