/* ============================================================
   徐镜钱 · 个人品牌站 · 设计系统（黑金电影质感 / 方向C）
   技术同源「机链全球 MachLink」：纯 CSS 变量 token，零框架。
   ============================================================ */
:root{
  --bg:#0B0B0D; --bg2:#131218; --bg3:#1A181F; --panel:#17161C; --panel2:#1F1D25;
  --line:rgba(255,255,255,.09); --line2:rgba(201,162,75,.28);
  --gold:#C9A24B; --gold2:#EAD08A; --gold-d:#9A7B3F;
  --txt:#F2EEE6; --muted:#B9B3A6; --muted2:#8A8578;
  --ok:#6FBF8B;
  --r:16px; --r-s:10px;
  --shadow:0 18px 50px rgba(0,0,0,.45);
  /* 主题相关背景 / 渐变（浅色主题里被覆盖） */
  --card-bg:linear-gradient(180deg,rgba(255,255,255,.028),rgba(255,255,255,.008));
  --hero-grad:radial-gradient(880px 620px at 82% 28%,rgba(201,162,75,.16),transparent 60%),linear-gradient(120deg,#0A0A0C 0%,#131218 58%,#0C0C0F 100%);
  --stripe-grad:linear-gradient(90deg,#100F13,#17151B);
  --band-grad:linear-gradient(180deg,#0C0C0F,#131218);
  --contact-grad:linear-gradient(135deg,#100F13,#1A181F);
  --ft-bg:#08080A;
  --hd-bg:rgba(11,11,13,.82);
  --grain:#ffffff;
  --hero-sub:#E9E3D5; --hero-en:#CFC7B4; --hero-strong:#ffffff;
  --grad-gold:linear-gradient(135deg,var(--gold2),var(--gold));
  --grad-name:linear-gradient(180deg,#FBF3DE 0%,#E7CE8E 48%,#B58C3C 100%);
  --font:'Noto Sans SC',-apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei','Segoe UI',sans-serif;
  --font-d:'Oswald',var(--font);
  --wrap:1200px; --head-h:68px;
}
/* ============ 浅色主题 ============ */
:root[data-theme="light"]{
  --bg:#FBF9F4; --bg2:#F2ECE1; --bg3:#EAE2D3; --panel:#FFFFFF; --panel2:#F7F1E7;
  --line:rgba(33,28,21,.12); --line2:rgba(184,145,47,.42);
  --gold:#B8912F; --gold2:#96761C; --gold-d:#8A6B2E;
  --txt:#211C15; --muted:#5E574A; --muted2:#938B7B;
  --shadow:0 18px 50px rgba(90,68,20,.12);
  --card-bg:#FFFFFF;
  --hero-grad:radial-gradient(880px 620px at 82% 28%,rgba(184,145,47,.18),transparent 60%),linear-gradient(120deg,#FBF9F4 0%,#F1E9DC 58%,#F7F1E7 100%);
  --stripe-grad:linear-gradient(90deg,#F3EDE2,#ECE4D6);
  --band-grad:linear-gradient(180deg,#F1EADE,#F7F1E7);
  --contact-grad:linear-gradient(135deg,#FFFFFF,#F3EBDC);
  --ft-bg:#EEE7DB;
  --hd-bg:rgba(251,249,244,.86);
  --grain:#5a4a20;
  --hero-sub:#3B342A; --hero-en:#6B6456; --hero-strong:#1A1610;
  --grad-name:linear-gradient(180deg,#C9A24B 0%,#A87E20 52%,#7E6222 100%);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{margin:0;padding:0}
body{font-family:var(--font);color:var(--txt);background:var(--bg);
  font-size:17px;line-height:1.75;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
[hidden]{display:none !important}
.num{font-family:var(--font-d);font-variant-numeric:tabular-nums;font-weight:700}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 32px}
h1,h2,h3,h4{margin:0}

/* ---------------- 顶栏 ---------------- */
.hd{position:fixed;top:0;left:0;right:0;z-index:50;height:var(--head-h);
  display:flex;align-items:center;transition:background .3s,border-color .3s,backdrop-filter .3s;
  border-bottom:1px solid transparent}
.hd.solid{background:var(--hd-bg);backdrop-filter:blur(12px);border-bottom-color:var(--line)}
.hd .wrap{display:flex;align-items:center;gap:24px;width:100%}
.brand{display:flex;align-items:center;gap:11px;font-weight:700;font-size:15px;letter-spacing:.06em}
.brand .m{width:34px;height:34px;border:1px solid var(--gold);color:var(--gold);border-radius:7px;
  display:flex;align-items:center;justify-content:center;font-family:var(--font-d);font-size:15px;flex:0 0 auto}
.brand b{white-space:nowrap}
.nav{display:flex;gap:26px;flex:1;font-size:14px;letter-spacing:.08em;color:var(--muted)}
.nav a{position:relative;padding:4px 0;transition:color .2s}
.nav a:hover{color:var(--txt)}
.nav a.on{color:var(--gold2)}
.nav a.on::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--grad-gold)}
.hd .right{display:flex;align-items:center;gap:14px}
.lang{display:inline-flex;border:1px solid var(--line2);border-radius:99px;overflow:hidden;font-size:12px}
.lang button{border:0;background:transparent;color:var(--muted);padding:6px 13px;cursor:pointer;font-family:inherit;letter-spacing:.06em;transition:.2s}
.lang button.on{background:var(--grad-gold);color:#1A140A;font-weight:700}
.theme-toggle{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;flex:0 0 auto;
  border:1px solid var(--line2);border-radius:50%;background:transparent;color:var(--gold2);cursor:pointer;font-size:14px;transition:.2s}
.theme-toggle:hover{border-color:var(--gold);color:var(--gold)}
@media(max-width:900px){.nav{display:none}}
/* 主题切换过渡（渐变区块即时切换，纯色区块柔和过渡） */
body,.hd,.section,.stripe,.tl-main,.tl-img,.feat,.stat-card,.media-box,.ai-metrics .m,.honor,.contact,.ft{
  transition:background-color .35s ease,border-color .3s ease,color .25s ease}

.btn{display:inline-flex;align-items:center;gap:9px;border:1px solid var(--line2);
  background:transparent;color:var(--gold2);border-radius:var(--r-s);padding:12px 24px;
  font-size:14px;font-weight:600;letter-spacing:.04em;cursor:pointer;font-family:inherit;transition:.2s}
.btn:hover{border-color:var(--gold)}
.btn.p{background:var(--grad-gold);border-color:transparent;color:#1A140A;font-weight:700}
.btn.p:hover{filter:brightness(1.06)}
.btn.sm{padding:9px 18px;font-size:13px}

/* ---------------- HERO ---------------- */
.hero{position:relative;min-height:100vh;overflow:hidden;display:flex;align-items:center;
  background:var(--hero-grad)}
.hero .grain{position:absolute;inset:0;opacity:.05;pointer-events:none;
  background-image:radial-gradient(var(--grain) 1px,transparent 1px);background-size:4px 4px}
.hero__grid{position:relative;z-index:3;width:100%;display:grid;grid-template-columns:1fr 1.04fr;
  gap:48px;align-items:center;padding-top:var(--head-h)}
.hero__inner{position:relative}
/* 右侧棚拍正装肖像：金边卡 + 金色光晕 */
.hero__portrait{position:relative;justify-self:center;width:min(510px,94%)}
.hero__portrait::before{content:"";position:absolute;inset:-10% -8% -8% -6%;border-radius:26px;
  background:radial-gradient(circle at 50% 40%,rgba(201,162,75,.28),transparent 62%);filter:blur(6px);z-index:0}
.hero__portrait .fr{position:relative;z-index:1;border-radius:20px;overflow:hidden;
  border:1px solid var(--line2);box-shadow:0 34px 80px rgba(0,0,0,.55),0 0 0 6px rgba(201,162,75,.06)}
.hero__portrait .fr img{width:100%;aspect-ratio:1/1;object-fit:cover;object-position:center 28%;
  filter:contrast(1.04) saturate(1.02)}
.hero__portrait .fr::after{content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,transparent 62%,rgba(8,8,10,.42))}
@media(max-width:900px){
  .hero__grid{grid-template-columns:1fr;gap:36px;padding-top:calc(var(--head-h) + 24px);text-align:center}
  .hero .line{margin-left:auto;margin-right:auto}
  .hero .role,.hero .tag{margin-left:auto;margin-right:auto}
  .hero .cta{justify-content:center}
  .hero__portrait{order:-1;width:min(300px,72%)}
}
.hero .line{width:64px;height:2px;background:linear-gradient(90deg,var(--gold),transparent);margin-bottom:26px}
.eyebrow{font-family:var(--font-d);font-weight:500;letter-spacing:.4em;font-size:13.5px;color:var(--gold);margin-bottom:18px;text-transform:uppercase}
.hero h1{font-weight:900;font-size:clamp(64px,10vw,120px);line-height:1.06;letter-spacing:.02em;
  padding-bottom:.06em;
  background:var(--grad-name);-webkit-background-clip:text;background-clip:text;color:transparent;
  text-shadow:0 2px 40px rgba(201,162,75,.14)}
.hero .en{font-family:var(--font-d);font-weight:600;letter-spacing:.5em;font-size:clamp(18px,2.2vw,24px);color:var(--hero-en);margin-top:16px}
.hero .role{margin:26px 0 20px;font-size:16px;color:var(--txt);line-height:1.8;font-weight:400}
.hero .role b{color:var(--hero-strong);font-weight:500}
.hero .role i{color:var(--gold-d);font-style:normal;margin:0 10px}
.hero .tag{font-size:clamp(18px,2vw,22px);line-height:1.62;color:var(--hero-sub);max-width:560px;font-weight:300}
.hero .tag b{color:var(--gold2);font-weight:600}
.hero .cta{display:flex;gap:16px;margin-top:36px;flex-wrap:wrap}
.scroll-cue{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);z-index:3;
  color:var(--muted2);font-size:11px;letter-spacing:.3em;text-align:center}
.scroll-cue i{display:block;width:1px;height:38px;margin:10px auto 0;background:linear-gradient(var(--gold),transparent);animation:cue 1.8s ease-in-out infinite}
@keyframes cue{0%,100%{opacity:.3;transform:scaleY(.6)}50%{opacity:1;transform:scaleY(1)}}

/* ---------------- 数据条 ---------------- */
.stripe{display:grid;grid-template-columns:repeat(4,1fr);background:var(--stripe-grad);
  border-top:1px solid var(--line2);border-bottom:1px solid var(--line)}
.stripe .st{padding:26px 40px;border-right:1px solid var(--line);position:relative}
.stripe .st:last-child{border-right:0}
.stripe .st .n{font-family:var(--font-d);font-weight:700;font-size:clamp(34px,4vw,48px);line-height:1;color:var(--gold2)}
.stripe .st .n small{font-size:.5em;color:var(--muted2);margin-left:2px}
.stripe .st .l{margin-top:8px;font-size:14px;letter-spacing:.02em;color:var(--muted)}
@media(max-width:820px){.stripe{grid-template-columns:repeat(2,1fr)}.stripe .st:nth-child(2){border-right:0}}

/* ---------------- 区块通用 ---------------- */
.section{padding:96px 0;position:relative}
.section.alt{background:var(--bg2)}
.section.dark{background:var(--band-grad)}
.sec-head{max-width:720px;margin:0 auto 56px;text-align:center}
.sec-head .kick{font-family:var(--font-d);letter-spacing:.36em;font-size:12.5px;color:var(--gold);text-transform:uppercase;margin-bottom:14px}
.sec-head h2{font-size:clamp(30px,4vw,42px);font-weight:900;letter-spacing:.02em;line-height:1.15}
.sec-head h2 em{font-style:normal;background:var(--grad-name);-webkit-background-clip:text;background-clip:text;color:transparent}
.sec-head p{margin:16px 0 0;color:var(--muted);font-size:18px;font-weight:400}

/* ---------------- 实力数据网格 ---------------- */
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.stat-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:28px 26px;transition:.25s}
.stat-card:hover{border-color:var(--line2);transform:translateY(-3px)}
.stat-card .n{font-family:var(--font-d);font-weight:700;font-size:40px;line-height:1;color:var(--gold2)}
.stat-card .n small{font-size:.5em;color:var(--muted2)}
.stat-card .l{margin-top:10px;color:var(--muted);font-size:14.5px}
@media(max-width:820px){.stat-grid{grid-template-columns:repeat(2,1fr)}}

/* ---------------- 时间轴（三次转型） ---------------- */
.timeline{max-width:1160px;margin:0 auto;position:relative;padding-left:44px}
.timeline::before{content:"";position:absolute;left:10px;top:12px;bottom:12px;width:2px;
  background:linear-gradient(var(--gold),var(--gold-d),transparent)}
.tl{position:relative;padding:0 0 84px 44px;display:flex;gap:48px;align-items:flex-start}
.tl:last-child{padding-bottom:8px}
.tl::before{content:"";position:absolute;left:-44px;top:30px;width:18px;height:18px;border-radius:50%;
  background:var(--bg);border:3px solid var(--gold);box-shadow:0 0 0 5px rgba(201,162,75,.1)}
/* 文案卡片 */
.tl-main{flex:1;min-width:0;background:var(--card-bg);
  border:1px solid var(--line);border-radius:18px;padding:32px 36px}
.tl-main p{margin-top:10px;border-left:2px solid var(--line2);padding-left:18px}
/* 大图 */
.tl-img{flex:0 0 42%;max-width:456px;position:relative;border:1px solid var(--line2);border-radius:16px;
  overflow:hidden;background:var(--panel);box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.tl:hover .tl-img{transform:translateY(-3px);box-shadow:0 28px 64px rgba(0,0,0,.52)}
.tl-img img{display:block;width:100%;aspect-ratio:3/2;object-fit:cover}
.tl-img .cap{position:absolute;left:0;right:0;bottom:0;padding:34px 22px 16px;font-size:14px;font-weight:500;
  letter-spacing:.02em;color:#EDE7D8;background:linear-gradient(transparent,rgba(8,8,10,.82))}
@media(max-width:820px){
  .tl{flex-direction:column;gap:22px;padding-bottom:56px}
  .tl::before{top:-6px;left:-44px}
  .tl-main{padding:26px 24px}
  .tl-img{flex:none;width:100%;max-width:none}
}
.tl .yr{font-family:var(--font-d);font-weight:700;font-size:15px;letter-spacing:.08em;color:var(--gold2)}
.tl .phase{display:inline-block;margin-left:12px;font-size:11.5px;letter-spacing:.14em;color:var(--muted2);
  border:1px solid var(--line);border-radius:99px;padding:2px 10px;vertical-align:middle}
.tl h3{margin:10px 0 6px;font-size:20px;font-weight:700;color:var(--txt)}
.tl p{margin:0;color:var(--muted);font-size:16px;font-weight:400;line-height:1.85}
.tl p b{color:var(--gold2);font-weight:600}

/* ---------------- 核心实力卡 ---------------- */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.feat{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:32px 28px;transition:.25s;position:relative;overflow:hidden}
.feat::after{content:"";position:absolute;left:0;top:0;height:3px;width:0;background:var(--grad-gold);transition:width .3s}
.feat:hover{border-color:var(--line2)}
.feat:hover::after{width:100%}
.feat .ic{width:52px;height:52px;border-radius:12px;background:rgba(201,162,75,.1);border:1px solid var(--line2);
  display:flex;align-items:center;justify-content:center;color:var(--gold2);font-size:22px;margin-bottom:20px}
.feat h3{font-size:19px;font-weight:700;margin-bottom:10px}
.feat p{color:var(--muted);font-size:16px;font-weight:400;line-height:1.85;margin:0 0 16px}
.feat .pts{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:8px}
.feat .pts li{font-size:14px;color:var(--muted);padding-left:20px;position:relative}
.feat .pts li::before{content:"";position:absolute;left:0;top:8px;width:7px;height:7px;border-radius:2px;background:var(--gold);transform:rotate(45deg)}
.feat .pts li b{color:var(--gold2);font-weight:600}
@media(max-width:900px){.feat-grid{grid-template-columns:1fr}}

/* ---------------- AI 故事（图文分栏） ---------------- */
.ai-split{display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:center;max-width:var(--wrap);margin:0 auto}
.ai-photo{position:relative;border-radius:var(--r);overflow:hidden;border:1px solid var(--line2);box-shadow:var(--shadow)}
.ai-photo img{width:100%;height:100%;object-fit:cover;aspect-ratio:4/3}
.ai-photo .cap{position:absolute;left:0;right:0;bottom:0;padding:26px 22px 16px;font-size:13.5px;color:#E9E3D5;
  background:linear-gradient(transparent,rgba(8,8,10,.9))}
.ai-photo .cap b{color:var(--gold2)}
.ai-body .kick{font-family:var(--font-d);letter-spacing:.34em;font-size:12.5px;color:var(--gold);text-transform:uppercase;margin-bottom:14px}
.ai-body h2{font-size:clamp(28px,3.4vw,36px);font-weight:900;line-height:1.2;margin-bottom:18px}
.ai-body h2 em{font-style:normal;color:var(--gold2)}
.ai-body p{color:var(--muted);font-size:16px;font-weight:400;line-height:1.85;margin:0 0 16px}
.ai-body p b{color:var(--txt);font-weight:500}
.ai-metrics{display:flex;gap:14px;flex-wrap:wrap;margin-top:24px}
.ai-metrics .m{flex:1;min-width:120px;background:var(--panel);border:1px solid var(--line);border-radius:var(--r-s);padding:16px 18px}
.ai-metrics .m .n{font-family:var(--font-d);font-weight:700;font-size:26px;color:var(--gold2);line-height:1}
.ai-metrics .m .l{font-size:12px;color:var(--muted);margin-top:6px}
@media(max-width:900px){.ai-split{grid-template-columns:1fr;gap:32px}}
/* 反向分栏（图在右）+ 竖版合影 + 要点金片 */
.split-rev .ai-photo{order:2}
.split-rev .ai-photo img{aspect-ratio:3/4}
.fr-row + .fr-row{margin-top:76px;padding-top:64px;border-top:1px solid var(--line)}
.hm-points{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}
.hm-points span{border:1px solid var(--line2);border-radius:99px;padding:9px 17px;font-size:14.5px;
  color:var(--gold2);background:rgba(201,162,75,.07);font-weight:600}
@media(max-width:900px){.split-rev .ai-photo{order:-1}}

/* ---------------- 荣誉 & 媒体 ---------------- */
.honor-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:40px;max-width:var(--wrap);margin:0 auto}
.honor-list{display:flex;flex-direction:column;gap:2px}
.honor{display:flex;gap:16px;align-items:flex-start;padding:16px 0;border-bottom:1px solid var(--line)}
.honor:last-child{border-bottom:0}
.honor .yr{font-family:var(--font-d);font-weight:700;color:var(--gold);font-size:14px;flex:0 0 56px;padding-top:2px}
.honor .tx b{display:block;font-size:16px;color:var(--txt);font-weight:600;margin-bottom:3px}
.honor .tx span{font-size:14px;color:var(--muted);font-weight:400}
.media-box{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:28px 26px;align-self:start}
.media-box h4{font-size:13px;letter-spacing:.14em;color:var(--muted2);text-transform:uppercase;margin-bottom:18px;font-family:var(--font-d)}
.media-logos{display:flex;flex-wrap:wrap;gap:10px}
.media-logos span{border:1px solid var(--line);border-radius:99px;padding:8px 15px;font-size:13px;color:var(--muted);transition:.2s}
.media-logos span:hover{border-color:var(--line2);color:var(--gold2)}
.honor-side{display:flex;flex-direction:column;gap:20px;align-self:start}
.honor-photo{position:relative;border-radius:var(--r);overflow:hidden;border:1px solid var(--line2);box-shadow:var(--shadow)}
.honor-photo img{width:100%;aspect-ratio:4/5;object-fit:cover;object-position:center 20%;display:block}
.honor-photo .cap{position:absolute;left:0;right:0;bottom:0;padding:24px 18px 14px;font-size:13px;line-height:1.5;color:#E9E3D5;background:linear-gradient(transparent,rgba(8,8,10,.92))}
.honor-photo .cap b{color:var(--gold2)}
@media(max-width:900px){.honor-grid{grid-template-columns:1fr}}

/* ---------------- 联系合作 ---------------- */
.contact{background:var(--contact-grad);border:1px solid var(--line2);border-radius:calc(var(--r) + 6px);
  padding:56px 48px;max-width:var(--wrap);margin:0 auto;display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:center;position:relative;overflow:hidden}
.contact::before{content:"";position:absolute;right:-80px;top:-80px;width:320px;height:320px;border-radius:50%;
  background:radial-gradient(circle,rgba(201,162,75,.14),transparent 65%)}
.contact h2{font-size:clamp(26px,3.4vw,36px);font-weight:900;line-height:1.2;margin-bottom:14px}
.contact h2 em{font-style:normal;color:var(--gold2)}
.contact p{color:var(--muted);font-weight:300;margin:0 0 8px}
.contact .info{position:relative;z-index:2}
.contact .info .row{display:flex;align-items:center;gap:12px;margin-top:14px;font-size:16px}
.contact .info .row i{width:38px;height:38px;border-radius:10px;background:rgba(201,162,75,.1);border:1px solid var(--line2);
  display:flex;align-items:center;justify-content:center;color:var(--gold2);flex:0 0 auto}
.contact .info .row b{color:var(--txt);font-weight:600}
.contact .info .row .phone{font-family:var(--font-d);font-size:22px;letter-spacing:.06em;color:var(--gold2)}
.contact .act{position:relative;z-index:2;display:flex;flex-direction:column;gap:14px}
@media(max-width:820px){.contact{grid-template-columns:1fr;padding:40px 28px}}

/* ---------------- 页脚 ---------------- */
.ft{background:var(--ft-bg);border-top:1px solid var(--line);padding:40px 0;color:var(--muted2);font-size:13px}
.ft .wrap{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}
.ft .brand{color:var(--muted);font-weight:600}
.ft .brand .m{border-color:var(--line);color:var(--muted)}

/* ---------------- 滚动揭示动画 ---------------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}
/* 安全网：若 IntersectionObserver 未运行（如后台标签页），到时强制显现，内容永不被困 */
html.reveal-safe .reveal{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}.scroll-cue i{animation:none}html{scroll-behavior:auto}}