/* ═══ 主题变量系统 ═══
   C=暖色精修(默认/现状)  A=深色影棚  B=亮色画廊
   只换配色，不改任何版式；用户可在导航栏切换并记忆。     */
:root{
  --bg:#faf8f3; --surface:#f2efe5; --surface2:#e9e5d8; --surface-hover:#ded9c9;
  --text:#0f0f0d; --muted:#66655c; --muted-strong:#8a867a; --border:#e3ded1;
  --primary:#2e3a2e; --primary-soft:#e6ede6; --primary-dark:#1b2419; --on-primary:#faf8f3;
  --accent:#c2410c;
  --amber-bg:#fdf1dc; --amber-tx:#8a5a0b;
  --danger:#a32d2d;
  --bg-rgb:250,248,243; --nav-bg:rgba(250,248,243,.92); --nav-bg-alt:rgba(250,248,243,.55);
  --overlay:rgba(15,15,13,.62); --overlay-strong:rgba(15,15,13,.72);
  --on-primary-rgb:250,248,243;
  --toast-bg:#1d1d29; --toast-fg:#fff; --disabled-bg:#b9bdb7;
  --shadow-rgb:60,50,30;
  --radius:16px; --radius-sm:10px;
  /* S1 字阶与间距节奏：统一 token，三主题共用 */
  --fs-h1:clamp(34px,5.2vw,58px); --lh-h1:1.1;
  --fs-h2:clamp(26px,3.4vw,38px); --lh-h2:1.18;
  --fs-h2-sm:clamp(24px,3.2vw,36px);
  --fs-h3:17px; --lh-h3:1.35;
  --fs-lead:18px; --lh-lead:1.6;
  --fs-body:16.5px; --fs-sm:14px; --fs-xs:12.5px;
  --sp-section:88px; --sp-section-sm:64px;
  --sp-sec-head:52px;
  font-size:16px;
}
/* ── A · 深色影棚 ── */
[data-theme="a"]{
  --bg:#0a0a0c; --surface:#121217; --surface2:#1a1a21; --surface-hover:#26262f;
  --text:#f5f5f7; --muted:#9a9aa6; --muted-strong:#6e6e7a; --border:#26262f;
  --primary:#7c6bff; --primary-soft:#211e3c; --primary-dark:#5b4de0; --on-primary:#ffffff; --on-primary-rgb:255,255,255;
  --accent:#ff6b35;
  --amber-bg:#2a1f10; --amber-tx:#ffb84d;
  --danger:#ff5c5c;
  --bg-rgb:10,10,12; --nav-bg:rgba(10,10,12,.92); --nav-bg-alt:rgba(10,10,12,.55);
  --overlay:rgba(0,0,0,.62); --overlay-strong:rgba(0,0,0,.75);
  --toast-bg:#23232b; --toast-fg:#fff; --disabled-bg:#33333d;
  --shadow-rgb:0,0,0;
}
/* ── B · 亮色画廊 ── */
[data-theme="b"]{
  --bg:#ffffff; --surface:#ffffff; --surface2:#f4f4f4; --surface-hover:#e8e8e8;
  --text:#000000; --muted:#5c5c5c; --muted-strong:#8a8a8a; --border:#e6e6e6;
  --primary:#000000; --primary-soft:#f0f0f0; --primary-dark:#333333; --on-primary:#ffffff; --on-primary-rgb:255,255,255;
  --accent:#ff5500;
  --amber-bg:#fff4ec; --amber-tx:#b3450a;
  --danger:#c0392b;
  --bg-rgb:255,255,255; --nav-bg:rgba(255,255,255,.92); --nav-bg-alt:rgba(255,255,255,.55);
  --overlay:rgba(0,0,0,.62); --overlay-strong:rgba(0,0,0,.75);
  --toast-bg:#000000; --toast-fg:#ffffff; --disabled-bg:#d4d4d4;
  --shadow-rgb:0,0,0;
  --radius:12px; --radius-sm:8px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei","Segoe UI",system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%;height:auto}
code{background:var(--surface2);padding:1px 6px;border-radius:5px;font-size:12.5px}
.container{max-width:1160px;margin:0 auto;padding:0 24px}

/* NAV_CSS 开始 —— 与子页共用，勿改成 HTML 注释：写在 <style> 内会被浏览器并入下一条选择器 */
/* nav */
.nav{position:sticky;top:0;z-index:50;background:var(--nav-bg);backdrop-filter:blur(8px);border-bottom:1px solid var(--border);transition:background .22s,backdrop-filter .22s,border-color .22s}
.nav.at-top{background:var(--nav-bg);backdrop-filter:blur(16px) saturate(1.1);border-bottom-color:transparent}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;letter-spacing:-.01em}
.logo-mark{width:30px;height:30px;display:flex;align-items:center;justify-content:center}.logo-mark img{width:100%;height:100%;display:block}
.nav-links{display:flex;gap:26px;font-size:14.5px;color:var(--muted)}
.nav-links a:hover{color:var(--primary)}
.nav-dd{position:relative}
.nav-dd>summary{list-style:none;cursor:pointer;color:var(--muted)}
.nav-dd>summary::-webkit-details-marker{display:none}
.nav-dd>summary:hover,.nav-dd[open]>summary{color:var(--primary)}
.nav-dd .dd-menu{position:absolute;left:50%;transform:translateX(-50%);top:calc(100% + 14px);background:var(--bg);border:1px solid var(--border);border-radius:16px;box-shadow:0 18px 44px rgba(var(--shadow-rgb),.12);padding:16px 20px;display:grid;grid-template-columns:repeat(2,minmax(180px,1fr));gap:6px 24px;min-width:440px;z-index:60}
/* 悬停桥：填住 summary 与菜单之间 14px 空隙，光标移过去不会中途收起 */
.nav-dd .dd-menu::before{content:"";position:absolute;left:0;right:0;top:-16px;height:16px}
.nav-dd .dd-col{display:flex;flex-direction:column;gap:4px}
.nav-dd .dd-h{font-size:11.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:4px}
.nav-dd .dd-menu a{color:var(--text);font-size:13.5px;padding:6px 12px;margin:0 -12px;border-radius:8px;white-space:nowrap;transition:background .15s,color .15s}
.nav-dd .dd-menu a:hover{color:var(--primary);background:var(--primary-soft)}
.nav-dd .dd-menu a .tag{font-size:10.5px;font-weight:700;border-radius:5px;padding:1px 5px;margin-left:6px;background:var(--amber-bg);color:var(--amber-tx)}
@media (max-width:1040px){.nav-dd .dd-menu{grid-template-columns:1fr;min-width:240px;left:0;transform:none}}
.nav-right{display:flex;align-items:center;gap:12px}
.credits-badge{display:flex;align-items:center;gap:6px;background:var(--amber-bg);color:var(--amber-tx);font-size:13.5px;font-weight:600;padding:5px 13px;border-radius:99px}
.lang-btn{border:1px solid var(--border);background:var(--bg);color:var(--muted);font-family:inherit;font-size:13px;font-weight:600;padding:6px 13px;border-radius:99px;cursor:pointer}
.lang-btn:hover{border-color:var(--primary);color:var(--primary)}
.lang-wrap{position:relative;display:inline-flex}
/* theme switcher */
.theme-btn{border:1px solid var(--border);background:var(--bg);color:var(--muted);font-family:inherit;font-size:13px;font-weight:600;padding:6px 12px;border-radius:99px;cursor:pointer;display:inline-flex;align-items:center;gap:6px;transition:.16s}
.theme-btn:hover{border-color:var(--primary);color:var(--primary)}
.theme-btn .sw-dot{width:11px;height:11px;border-radius:50%;background:linear-gradient(135deg,var(--primary) 0 55%,var(--bg) 55% 100%);border:1px solid var(--border);flex:0 0 auto}
.theme-wrap{position:relative;display:inline-flex}
.theme-dd{position:absolute;top:calc(100% + 8px);right:0;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 12px 34px rgba(var(--shadow-rgb),.14);min-width:246px;display:none;overflow:hidden;z-index:70}
.theme-dd.open{display:block}
.theme-dd .dd-head{padding:13px 15px 7px;font-size:11.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.theme-opt{display:flex;align-items:center;gap:11px;width:100%;text-align:left;border:0;background:0;cursor:pointer;font-family:inherit;font-size:13.5px;color:var(--text);padding:11px 15px;transition:.15s}
.theme-opt:hover{background:var(--surface-hover)}
.theme-opt.on{background:var(--primary-soft);color:var(--primary);font-weight:600}
.theme-swatch{width:38px;height:24px;border-radius:7px;flex:0 0 auto;display:flex;overflow:hidden;border:1px solid var(--border)}
.theme-swatch i{display:block;flex:1}
.theme-opt .tn{white-space:nowrap}
@media (max-width:900px){.theme-btn{padding:6px 10px}.theme-btn .tx{display:none}}
.lang-menu{max-height:62vh;overflow-y:auto}
.lang-menu .cur{color:var(--primary);font-weight:700}
/* NAV_CSS 结束 */
[dir="rtl"] .nav-inner,[dir="rtl"] .foot-inner{flex-direction:row-reverse}
[dir="rtl"] .dropdown{right:auto;left:0}
[dir="rtl"] .hero-tag{unicode-bidi:embed}
.foot-legal a{color:inherit;text-decoration:underline;text-underline-offset:3px;text-decoration-color:var(--border)}
.foot-legal a:hover{color:var(--primary)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;cursor:pointer;font-family:inherit;font-size:14.5px;font-weight:600;border-radius:99px;padding:11px 24px;transition:.16s}
.btn-primary{background:var(--primary);color:var(--on-primary)}
.btn-primary:hover{background:var(--primary-dark)}
.btn-primary:disabled{background:var(--disabled-bg);cursor:not-allowed}
.btn-ghost{background:var(--surface2);color:var(--text)}
.btn-ghost:hover{background:var(--surface-hover)}
.btn-sm{padding:8px 16px;font-size:13.5px}
/* user menu */
.user-menu{position:relative}
.user-avatar{display:flex;align-items:center;gap:8px;cursor:pointer;padding:5px 12px;border-radius:99px;border:1px solid var(--border);font-size:13.5px;font-weight:600}
.user-avatar:hover{border-color:var(--primary)}
.avatar-dot{width:26px;height:26px;border-radius:50%;background:var(--primary);color:var(--on-primary);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700}
.dropdown{position:absolute;top:calc(100% + 8px);right:0;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 12px 34px rgba(var(--shadow-rgb),.12);min-width:210px;display:none;overflow:hidden}
.dropdown.open{display:block}
.dropdown .dd-head{padding:12px 16px;border-bottom:1px solid var(--border)}
.dropdown .dd-head b{font-size:14px}
.dropdown .dd-head small{display:block;color:var(--muted);font-size:12px}
.dropdown button{display:block;width:100%;text-align:left;background:none;border:none;font-family:inherit;font-size:13.5px;padding:11px 16px;cursor:pointer;color:var(--text)}
.dropdown button:hover{background:var(--surface)}
.dropdown button.danger{color:var(--danger)}

/* hero — S1 重排：左文右图，文字落在实色面板上，不再压动态背景 */
.hero{position:relative;overflow:hidden;padding:72px 0 64px}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.04fr) minmax(0,.96fr);gap:52px;align-items:center;position:relative;z-index:1}
.hero-copy{background:var(--surface);border:1px solid var(--border);border-radius:26px;padding:46px 42px;text-align:left;box-shadow:0 30px 70px -36px rgba(var(--shadow-rgb),.34)}
.hero-media{position:relative;border-radius:22px;overflow:hidden;border:1px solid var(--border);background:url("/assets/hero/montage-poster.webp") center/cover no-repeat var(--surface);aspect-ratio:4/3;box-shadow:0 30px 70px -36px rgba(var(--shadow-rgb),.34)}
.hero-media video{width:100%;height:100%;object-fit:cover;display:block}
@media (prefers-reduced-motion:reduce){.hero-media video{display:none}}
.hero-tag{display:inline-block;background:var(--primary);color:var(--on-primary);font-size:var(--fs-xs);font-weight:600;letter-spacing:.02em;padding:6px 16px;border-radius:99px;margin-bottom:20px}
.hero h1{font-size:var(--fs-h1);line-height:var(--lh-h1);font-weight:800;letter-spacing:-.028em}
.hero h1 .grad{color:var(--accent)}
.hero p.sub{max-width:600px;margin:18px 0 0;color:var(--muted);font-size:var(--fs-lead);line-height:var(--lh-lead)}
.hero-cta{display:flex;justify-content:flex-start;gap:12px;margin-top:26px;flex-wrap:wrap}
.hero-stats{display:grid;grid-template-columns:repeat(4,auto);justify-content:space-between;gap:18px;margin-top:30px;padding-top:26px;border-top:1px solid var(--border)}
.stat b{display:block;font-size:26px;font-weight:700;letter-spacing:-.02em}
.stat span{font-size:13px;color:var(--muted)}

/* workbench */
.workbench{margin:0 0 88px}
.wb-card{background:var(--bg);border:1px solid var(--border);border-radius:22px;box-shadow:0 18px 50px rgba(var(--shadow-rgb),.07);overflow:hidden}
.wb-grid{display:grid;grid-template-columns:1.05fr 1fr;min-height:520px}
.wb-left{padding:30px;border-right:1px solid var(--border);display:flex;flex-direction:column;gap:16px}
.wb-right{background:var(--surface);padding:30px;display:flex;flex-direction:column}
.field label{display:block;font-size:13.5px;font-weight:600;margin-bottom:8px}
.field label .opt{color:var(--muted);font-weight:400;font-size:12px}
textarea{width:100%;min-height:110px;resize:vertical;border:1px solid var(--border);border-radius:var(--radius-sm);padding:13px 14px;font-family:inherit;font-size:14.5px;color:var(--text);background:var(--bg)}
textarea:focus{outline:2px solid var(--primary-soft);border-color:var(--primary)}
.style-chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{padding:7px 15px;border:1px solid var(--border);border-radius:99px;font-size:13.5px;cursor:pointer;background:var(--bg);transition:.15s;user-select:none}
.chip:hover{border-color:var(--primary)}
.chip.on{background:var(--primary);border-color:var(--primary);color:var(--on-primary)}
.ar-chips{display:flex;gap:8px}
.ar-chips .chip{padding:7px 12px;font-size:12.5px}
.ref-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.ref-thumbs{display:flex;gap:8px;margin-top:8px;flex-wrap:wrap}
.ref-thumb{position:relative;width:56px;height:56px;border-radius:9px;overflow:hidden;border:1px solid var(--border)}
.ref-thumb img{width:100%;height:100%;object-fit:cover}
.ref-thumb .rm{position:absolute;top:0;right:0;width:16px;height:16px;line-height:14px;text-align:center;background:var(--overlay);color:#fff;font-size:12px;cursor:pointer;border-radius:0 0 0 6px}
.result-stage.multi{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.result-stage.multi img{height:100%;object-fit:cover}
.ref-hint{font-size:12.5px;color:var(--muted)}
.wb-bottom{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:12px}
.wb-note{font-size:12.5px;color:var(--muted)}
#genBtn{min-width:150px}
/* right panel */
.result-stage{flex:1;display:flex;align-items:center;justify-content:center;border:1px dashed var(--border);border-radius:var(--radius);background:var(--bg);min-height:300px;position:relative;overflow:hidden}
.stage-idle{color:var(--muted);font-size:14px;text-align:center;padding:20px}
.stage-idle .big{font-size:36px;margin-bottom:8px;opacity:.45}
.result-stage img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}
.stage-loading{position:absolute;inset:0;background:var(--nav-bg);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;z-index:2}
.spinner{width:34px;height:34px;border-radius:50%;border:3px solid var(--primary-soft);border-top-color:var(--primary);animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.load-txt{font-size:13.5px;color:var(--primary);font-weight:600}
.progress-bar{width:200px;height:6px;background:var(--surface2);border-radius:99px;overflow:hidden}
.progress-fill{height:100%;width:0;background:var(--primary);border-radius:99px;transition:width .3s}
.result-meta{display:flex;justify-content:space-between;align-items:center;margin-top:14px;font-size:13px;color:var(--muted)}
.history h4{font-size:13.5px;margin:18px 0 10px}
.hist-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.hist-item{aspect-ratio:1;border-radius:9px;overflow:hidden;border:1px solid var(--border);cursor:pointer;background:var(--bg);position:relative}
.hist-item img{width:100%;height:100%;object-fit:cover}
.hist-item:hover{border-color:var(--primary)}
.hist-share{position:absolute;left:4px;bottom:4px;z-index:2;border:0;border-radius:99px;padding:3px 9px;font-size:11px;font-weight:600;cursor:pointer;background:var(--overlay-strong);color:#fff}
.hist-share:hover{background:var(--overlay-strong)}
.hist-share.on{background:var(--primary);color:var(--on-primary)}
/* 历史文件缺失/过期的降级态：不显示破图，改为占位提示 */
.hist-item.is-broken{cursor:default}
.hist-item.is-broken img,.hist-item.is-broken video{display:none}
.hist-item.is-broken::before{content:"⚠";position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:18px;color:var(--muted);background:var(--surface2)}
.hist-item.is-broken::after{content:attr(data-broken);position:absolute;left:0;right:0;bottom:4px;text-align:center;font-size:10.5px;color:var(--muted)}

/* sections */
section{padding:var(--sp-section) 0}
.eyebrow{display:block;font-size:12px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:14px}
.sec-head{text-align:center;margin-bottom:var(--sp-sec-head);max-width:680px;margin-left:auto;margin-right:auto}
.sec-head h2{font-size:var(--fs-h2);font-weight:800;letter-spacing:-.025em;line-height:var(--lh-h2)}
.sec-head p{color:var(--muted);margin-top:14px;font-size:var(--fs-body)}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.grid-4>*{min-width:0}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:28px}
.card .ico{width:44px;height:44px;border-radius:12px;background:var(--primary-soft);display:flex;align-items:center;justify-content:center;font-size:20px;margin-bottom:16px}
.card h3{font-size:var(--fs-h3);margin-bottom:8px;font-weight:700;letter-spacing:-.01em;line-height:var(--lh-h3)}
.card p{font-size:13.8px;color:var(--muted);line-height:1.65}
.step{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:28px}
.step .num{width:32px;height:32px;border-radius:50%;background:var(--primary);color:var(--on-primary);font-weight:700;font-size:14px;display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.step h3{font-size:var(--fs-h3);font-weight:700;margin-bottom:8px}
.step p{font-size:13.8px;color:var(--muted)}

/* 模型矩阵 */
/* 模型货架：Tab + 缩略图卡 + 积分胶囊 */
.mtabs{display:flex;gap:8px;justify-content:center;margin-bottom:26px}
.mtabs .chip{cursor:pointer}
.mgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.mcard{display:flex;flex-direction:column;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:.18s}
.mcard:hover{border-color:var(--primary);transform:translateY(-3px);box-shadow:0 14px 34px rgba(var(--shadow-rgb),.07)}
.mthumb{position:relative;display:block;aspect-ratio:16/10;overflow:hidden;background:linear-gradient(135deg,var(--primary-soft),var(--surface))}
.mthumb img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .4s ease}
.mcard:hover .mthumb img{transform:scale(1.05)}
.m-cred{position:absolute;top:10px;right:10px;background:rgba(10,12,18,.62);color:#fff;font-size:12px;font-weight:700;padding:4px 11px;border-radius:99px;backdrop-filter:blur(6px);letter-spacing:.01em;white-space:nowrap}
.mbody{display:flex;flex-direction:column;flex:1;padding:18px 20px 20px}
.mcard .m-family{font-size:11.5px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.mcard h3{font-size:var(--fs-h3);margin:7px 0 7px;font-weight:700;letter-spacing:-.01em}
.mcard p{font-size:13.5px;color:var(--muted);line-height:1.6}
.mcard .m-go{display:inline-block;margin-top:auto;padding-top:14px;font-size:13px;font-weight:600;color:var(--primary)}
.mcard:hover .m-go{color:var(--accent)}
/* Bento 网格（核心功能 × 使用场景合并） */
.bento{display:grid;grid-template-columns:repeat(12,1fr);gap:16px}
.bento .bcell{display:flex;flex-direction:column;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:26px;position:relative;transition:.18s;min-width:0}
a.bcell:hover{border-color:var(--primary);transform:translateY(-2px);box-shadow:0 14px 34px rgba(var(--shadow-rgb),.07)}
.bento .bcell h3{font-size:var(--fs-h3);margin-bottom:8px;font-weight:700;letter-spacing:-.01em;line-height:var(--lh-h3)}
.bento .bcell p{font-size:13.8px;color:var(--muted);line-height:1.65}
.bento .bcell .b-go{margin-top:auto;padding-top:14px;font-size:13px;font-weight:600;color:var(--primary)}
.bento .bcell .ico{width:44px;height:44px;border-radius:12px;background:var(--primary-soft);display:flex;align-items:center;justify-content:center;font-size:20px;margin-bottom:16px}
.b-lg{grid-column:span 6}.b-md{grid-column:span 3}.b-w{grid-column:span 4}
.b-lg .ico{width:52px;height:52px;font-size:25px}
.b-lg h3{font-size:19px}
@media(max-width:960px){.b-lg,.b-md,.b-w{grid-column:span 6}}
@media(max-width:620px){.b-lg,.b-md,.b-w{grid-column:span 12}}
/* 三步横向 stepper */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:0;counter-reset:step}
.steps .step{background:none;border:none;padding:0 34px;text-align:center;position:relative}
.steps .step .num{width:44px;height:44px;border-radius:50%;background:var(--primary);color:var(--on-primary);font-weight:700;font-size:17px;display:flex;align-items:center;justify-content:center;margin:0 auto 18px;box-shadow:0 0 0 8px var(--primary-soft)}
.steps .step:not(:last-child)::after{content:"";position:absolute;top:22px;left:calc(50% + 44px);right:calc(-50% + 44px);height:2px;background:linear-gradient(90deg,var(--primary) 0,var(--border) 90%);opacity:.5}
.steps .step h3{font-size:var(--fs-h3);font-weight:700;margin-bottom:8px}
.steps .step p{font-size:13.8px;color:var(--muted);line-height:1.65;max-width:280px;margin:0 auto}
.usecard{display:block;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:28px;transition:.18s}
.usecard:hover{border-color:var(--primary);transform:translateY(-3px)}
.usecard .u-ico{font-size:26px;margin-bottom:14px}
.usecard h3{font-size:var(--fs-body);font-weight:700;margin-bottom:8px}
.usecard p{font-size:13.8px;color:var(--muted);margin-bottom:14px}
.usecard .u-go{font-size:13px;font-weight:600;color:var(--primary)}

/* gallery */
.gal{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.gal figure{border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);position:relative;background:var(--surface2)}
.gal img{aspect-ratio:1;object-fit:cover;width:100%;transition:.35s}
.gal figure:hover img{transform:scale(1.05)}
.gal figcaption{position:absolute;left:0;right:0;bottom:0;padding:24px 14px 12px;font-size:12.5px;color:#fff;background:linear-gradient(transparent,var(--overlay))}
.gal a{display:block}
.gal-more{text-align:center;margin-top:36px}
.gal-more a{display:inline-block;border:1.5px solid var(--primary);color:var(--primary);font-weight:700;font-size:14.5px;padding:12px 32px;border-radius:99px;transition:.2s}
.gal-more a:hover{background:var(--primary);color:var(--on-primary)}

/* pricing */
.plan{border:1px solid var(--border);border-radius:var(--radius);padding:32px;background:var(--bg);display:flex;flex-direction:column}
.plan.hot{border-color:var(--primary);box-shadow:0 14px 40px rgba(var(--shadow-rgb),.1);position:relative}
.hot-badge{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--primary);color:var(--on-primary);font-size:12px;font-weight:600;padding:4px 15px;border-radius:99px}
.plan h3{font-size:var(--fs-h3);font-weight:700}
.plan .price{font-size:38px;font-weight:800;margin:14px 0 2px;letter-spacing:-.03em}
.plan .price small{font-size:14px;color:var(--muted);font-weight:400}
.plan .desc{font-size:13.2px;color:var(--muted);margin-bottom:18px}
.plan ul{list-style:none;flex:1;margin-bottom:22px}
.plan li{font-size:13.6px;padding:6px 0;display:flex;gap:9px;align-items:flex-start}
.plan li::before{content:"—";color:var(--primary);font-weight:700}

/* faq */
.faq{max-width:760px;margin:0 auto}
.faq-item{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:10px;background:var(--bg);overflow:hidden}
.faq-q{width:100%;text-align:left;background:none;border:none;font-family:inherit;font-size:15px;font-weight:600;padding:18px 22px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;color:var(--text)}
.faq-q::after{content:"+";font-size:18px;color:var(--primary)}
.faq-item.open .faq-q::after{content:"−"}
.faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease;font-size:13.8px;color:var(--muted);padding:0 22px}
.faq-item.open .faq-a{max-height:280px;padding:0 22px 18px}

/* cta band */
.cta-band{background:var(--surface);border:1px solid var(--border);color:var(--text);border-radius:24px;padding:64px 40px;text-align:center;margin:0 0 88px}
.cta-band h2{font-size:var(--fs-h2-sm);font-weight:800;letter-spacing:-.025em;color:var(--text);line-height:1.2}
.cta-band p{color:var(--muted);margin:14px auto 0;max-width:560px;font-size:16.5px}
.cta-band .btn{margin-top:28px}

/* 定价：月付 / 年付 切换 */
.billbar{display:flex;justify-content:center;align-items:center;gap:12px;margin:-4px 0 28px}
.billbar .seg{display:inline-flex;background:var(--surface2);border:1px solid var(--border);border-radius:99px;padding:4px;gap:2px}
.billbar .chip{border:none;background:none;font-weight:600;color:var(--muted);border-radius:99px;padding:8px 22px}
.billbar .chip.on{background:var(--bg);color:var(--primary);box-shadow:0 1px 4px rgba(var(--shadow-rgb),.1)}
.bill-save{font-size:12px;font-weight:700;color:var(--primary);background:var(--primary-soft);padding:4px 11px;border-radius:99px;letter-spacing:.02em}
.plan .price{font-variant-numeric:tabular-nums}
.plan .btn-annual{display:none}
.billing-monthly .plan .btn-annual{display:block}
.plan .credits-m{color:var(--muted)}

/* FAQ 手风琴增强 */
.faq-bar{display:flex;justify-content:center;margin:-6px 0 22px}
.faq-bar .chip{border:1px solid var(--border);background:var(--surface);font-size:12.5px;padding:7px 16px;color:var(--muted-strong)}
.faq-bar .chip:hover{border-color:var(--primary);color:var(--primary)}
.faq-q::after{transition:transform .28s ease;display:inline-block}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{transition:max-height .3s cubic-bezier(.4,0,.2,1),opacity .25s;opacity:0}
.faq-item.open .faq-a{opacity:1}

/* footer 三列 */
.foot-top{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:36px;padding:6px 0 34px}
.foot-col h4{font-size:11.5px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--fg);margin-bottom:15px}
.foot-col a{display:block;font-size:13px;color:var(--muted);padding:6px 0;transition:.15s}
.foot-col a:hover{color:var(--primary)}
.foot-brand{font-size:15px;font-weight:800;color:var(--fg);letter-spacing:-.02em;margin-bottom:10px}
.foot-brand-sub{font-size:13px;color:var(--muted);line-height:1.65;max-width:34ch}
.foot-bottom{border-top:1px solid var(--border);padding-top:22px;display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;font-size:12.5px;color:var(--muted)}
.foot-social{display:flex;gap:10px;align-items:center;padding:0 0 24px}
.foot-social a{width:34px;height:34px;border:1px solid var(--border);border-radius:9px;display:inline-flex;align-items:center;justify-content:center;color:var(--muted);transition:.15s;background:transparent;text-decoration:none}
.foot-social a:hover{color:var(--primary);border-color:var(--primary);transform:translateY(-1px)}
.foot-social svg{width:16px;height:16px;fill:currentColor}

/* footer */
footer{border-top:1px solid var(--border);padding:44px 0;background:var(--surface)}
.foot-inner{display:block;font-size:13px;color:var(--muted)}
.foot-links{display:block;margin-top:0}

/* modal */
.modal-mask{position:fixed;inset:0;background:rgba(28,26,18,.42);display:none;align-items:center;justify-content:center;z-index:100;padding:20px}
.modal-mask.open{display:flex}
.modal{background:var(--bg);border-radius:var(--radius);width:100%;max-width:400px;padding:30px;position:relative}
.modal h3{font-size:21px;margin-bottom:6px;font-weight:800;letter-spacing:-.02em}
.modal .modal-sub{font-size:13.5px;color:var(--muted);margin-bottom:20px}
.modal-close{position:absolute;top:14px;right:14px;background:none;border:none;font-size:20px;color:var(--muted);cursor:pointer;line-height:1}
/* 3DS 前置说明（2026-10-01）：中性色调 + 盾形图标，口径是"替你把关"而不是"怀疑你"——
   用警示红会直接劝退用户，这与"避免防御太严导致流失"的目标相反。 */
.d3s-badge{width:46px;height:46px;border-radius:13px;background:var(--primary-soft);color:var(--primary);display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.d3s-tip{font-size:12.5px;line-height:1.65;color:var(--muted);background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:11px 13px;margin:0 0 18px}
.d3s-actions{display:flex;gap:10px}
.d3s-actions .btn{flex:1}
.auth-tabs{display:flex;background:var(--surface2);border-radius:var(--radius-sm);padding:4px;margin-bottom:20px}
.auth-tabs button{flex:1;border:none;background:none;font-family:inherit;font-size:13.5px;font-weight:600;padding:9px;border-radius:9px;cursor:pointer;color:var(--muted)}
.auth-tabs button.on{background:var(--bg);color:var(--primary);box-shadow:0 1px 4px rgba(var(--shadow-rgb),.1)}
.auth-field{margin-bottom:15px}
.auth-field label{display:block;font-size:13px;font-weight:600;margin-bottom:6px}
.auth-field input{width:100%;border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px 14px;font-family:inherit;font-size:14.5px;background:var(--bg)}
.auth-field input:focus{outline:2px solid var(--primary-soft);border-color:var(--primary)}
.auth-field .hint{font-size:12px;color:var(--muted);margin-top:5px}
.auth-err{color:var(--danger);font-size:13px;min-height:18px;margin-bottom:6px}
.auth-ok{font-size:13px;color:var(--muted);text-align:center;margin-top:14px}
#authModal .btn{width:100%}
#authModal .auth-divider{display:none;align-items:center;gap:10px;margin:14px 0 10px;color:var(--muted-strong);font-size:12px}
#authModal .auth-divider::before,#authModal .auth-divider::after{content:"";flex:1;height:1px;background:var(--border)}
#authModal #gbtn{display:none;margin-bottom:4px}
#authModal #gbtn iframe{border-radius:24px!important}

/* 套餐与账单弹窗 */
#billModal .modal{width:min(880px,96vw);max-width:96vw;max-height:88vh;overflow:auto}
.bill-top{display:flex;gap:14px;margin:16px 0 12px}
.bill-stat{flex:1;border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 16px}
.bill-stat small{display:block;color:var(--muted);font-size:13px;margin-bottom:5px}
.bill-stat b{font-size:26px}
.bill-sums{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:8px}
.bill-sums>div{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);padding:11px 13px}
.bill-sums small{display:block;color:var(--muted);font-size:12.5px;margin-bottom:4px}
.bill-sums span{font-weight:700;font-size:18px}
.bill-list{max-height:460px;overflow:auto;border:1px solid var(--border);border-radius:var(--radius-sm)}
.bill-row{display:flex;align-items:center;gap:12px;padding:12px 16px;border-bottom:1px solid var(--border);font-size:14.5px}
.bill-row:last-child{border-bottom:none}
.bill-row .br-time{color:var(--muted);flex:0 0 132px;font-variant-numeric:tabular-nums}
.bill-row .br-reason{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.bill-row .br-delta{font-weight:700;font-variant-numeric:tabular-nums}
.bill-row .br-delta.plus{color:var(--ok,#0a8f4d)}
.bill-row .br-bal{color:var(--muted);flex:0 0 84px;text-align:right;font-variant-numeric:tabular-nums}
@media(max-width:560px){.bill-sums{grid-template-columns:repeat(2,1fr)}.bill-row .br-bal{display:none}}

/* toast */
#toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%) translateY(20px);background:var(--toast-bg);color:var(--toast-fg);font-size:13.5px;padding:11px 22px;border-radius:99px;opacity:0;pointer-events:none;transition:.25s;z-index:99;max-width:80vw}
#toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* 特效卡（缩略图 + 悬停前后对比；视频类仅有效果图静帧） */
.efsec-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px}
.efsec-card{display:flex;flex-direction:column;align-items:center;gap:8px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;padding:0 0 14px;transition:.18s}
.efsec-card:hover{border-color:var(--primary);transform:translateY(-2px)}
.efsec-thumb{position:relative;display:block;width:100%;aspect-ratio:1/1;overflow:hidden;background:var(--surface2)}
.efsec-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}
.efsec-after{z-index:1}
.efsec-before{z-index:2;clip-path:inset(0 0 0 0);transition:clip-path .45s cubic-bezier(.4,0,.2,1)}
.efsec-card:hover .efsec-before{clip-path:inset(0 50% 0 0)}
.efsec-line{position:absolute;top:0;bottom:0;left:0;width:2px;margin-left:-1px;background:rgba(255,255,255,.95);box-shadow:0 0 10px rgba(0,0,0,.45);z-index:3;transition:left .45s cubic-bezier(.4,0,.2,1),opacity .3s;opacity:0}
.efsec-vid{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:1}
.efsec-badge{position:absolute;top:8px;right:8px;z-index:4;background:rgba(0,0,0,.55);color:#fff;font-size:11px;line-height:1;padding:5px 7px;border-radius:999px;pointer-events:none}
.efsec-grid-v{margin-top:12px}
.efsec-card:hover .efsec-line{left:50%;opacity:1}
.efsec-ico{font-size:30px}
.efsec-card b{font-size:14px;padding:0 8px;text-align:center}
.efsec-cred{font-size:12px;color:var(--primary);font-weight:700}

/* 前后对比卡（1b 原图覆盖 1a 效果图，悬停/点按拉开） */
.ba-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:36px}
.ba-card{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:.18s}
.ba-card:hover{border-color:var(--primary);transform:translateY(-3px);box-shadow:0 18px 44px rgba(var(--shadow-rgb),.10)}
.ba-stage{position:relative;aspect-ratio:1/1;overflow:hidden;background:var(--surface2);cursor:ew-resize;touch-action:manipulation}
.ba-stage img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center 30%;display:block}
.ba-after{z-index:1}
.ba-before{z-index:2;clip-path:inset(0 0 0 0);transition:clip-path .55s cubic-bezier(.4,0,.2,1)}
.ba-card:hover .ba-before,.ba-card.open .ba-before{clip-path:inset(0 50% 0 0)}
.ba-line{position:absolute;top:0;bottom:0;left:0;width:2px;margin-left:-1px;background:rgba(255,255,255,.95);box-shadow:0 0 10px rgba(0,0,0,.45);z-index:3;transition:left .55s cubic-bezier(.4,0,.2,1)}
.ba-card:hover .ba-line,.ba-card.open .ba-line{left:50%}
.ba-grip{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:32px;height:32px;border-radius:50%;background:rgba(255,255,255,.94);color:#16161a;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;letter-spacing:-1px;box-shadow:0 4px 14px rgba(0,0,0,.35)}
.ba-tag{position:absolute;top:10px;z-index:3;font-size:10.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;padding:4px 10px;border-radius:99px;color:#fff;background:rgba(10,10,14,.45);backdrop-filter:blur(4px);transition:opacity .35s}
.ba-tag.l{left:10px}
.ba-tag.r{right:10px}
.ba-card:hover .ba-tag.l,.ba-card.open .ba-tag.l{opacity:.55}
.ba-info{display:flex;align-items:center;gap:10px;padding:13px 15px;border-top:1px solid var(--border)}
.ba-info b{font-size:13.5px;flex:1;color:var(--fg)}
.ba-cred{font-size:12px;color:var(--primary);font-weight:700}
.ba-go{font-size:13px;color:var(--muted);transition:.18s}
.ba-info:hover .ba-go{color:var(--primary);transform:translateX(3px)}
.ba-hint{text-align:center;font-size:12.5px;color:var(--muted);margin-top:16px}

/* 画廊 prompt 悬停显现 */
.gal .gal-prompt{position:absolute;inset:0;z-index:2;display:flex;flex-direction:column;justify-content:flex-end;gap:7px;padding:14px 14px 38px;color:#fff;background:linear-gradient(180deg,rgba(var(--shadow-rgb),.05) 30%,rgba(var(--shadow-rgb),.74));opacity:0;transition:opacity .3s}
.gal figure:hover .gal-prompt{opacity:1}
.gal .gal-plabel{font-size:10px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;opacity:.82}
.gal .gal-ptext{font-size:11.5px;line-height:1.55;font-family:ui-monospace,Menlo,Consolas,monospace;display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}

@media(max-width:1040px){
  .mgrid{grid-template-columns:repeat(2,1fr)}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .ba-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:900px){
  .nav-links{display:none}
  .wb-grid{grid-template-columns:1fr}
  .wb-left{border-right:none;border-bottom:1px solid var(--border)}
  .grid-4,.gal{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:1fr}
  .foot-top{grid-template-columns:1fr 1fr;gap:26px}
  .foot-col:first-child{grid-column:1/-1}
  .steps{grid-template-columns:1fr;gap:34px}
  .steps .step{padding:0;text-align:left}
  .steps .step .num{margin:0 0 14px}
  .steps .step p{max-width:none}
  .steps .step:not(:last-child)::after{content:none}
  section{padding:var(--sp-section-sm)}
  .hero{padding:56px 0 48px}
  .hero-grid{grid-template-columns:1fr;gap:28px}
  .hero-copy{padding:32px 24px;border-radius:20px}
  .hero-media{aspect-ratio:16/10}
  .hero-stats{gap:26px}
  .hero-cta,.hero-stats{justify-content:flex-start}
  .cta-band{padding:48px 24px}
}
@media(max-width:620px){
  .mgrid{grid-template-columns:1fr}
  .grid-4{grid-template-columns:1fr}
  .gal{grid-template-columns:repeat(2,1fr)}
  .ba-grid{grid-template-columns:1fr}
  .container{padding:0 18px}
  .hero-stats{grid-template-columns:repeat(2,1fr);gap:20px}
  .foot-top{grid-template-columns:1fr;gap:24px}
  .foot-bottom{flex-direction:column;align-items:flex-start}
  .billbar{gap:8px}
  .billbar .chip{padding:8px 16px}
}