@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&display=swap');
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:#ffffff;color:#1f1f1f;font-family:'Inter',-apple-system,BlinkMacSystemFont,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;font-size:17px;line-height:1.75;font-weight:400;letter-spacing:.01em;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%;height:auto}
a{color:#1f1f1f;text-decoration:none}
p{margin:0}
button{font-family:inherit}

/* 顶栏 */
.bar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px clamp(14px,4vw,32px);border-bottom:1px solid #e8e8e8;background:#ffffff}
.mark{display:inline-flex;align-items:center;justify-content:center;min-height:44px;min-width:44px;max-width:40vw;padding:0 12px;background:#1f1f1f;color:#ffffff;font-size:14px;font-weight:600;letter-spacing:.06em;overflow:hidden;white-space:nowrap}
.mark:hover{background:#000000}
.bar-end{display:flex;align-items:center;gap:8px}
.contact{display:inline-flex;align-items:center;min-height:44px;padding:0 16px;background:#1f1f1f;color:#ffffff;font-size:15px;letter-spacing:.04em}
.contact:hover{background:#454545}
.burger{display:inline-flex;align-items:center;min-height:44px;padding:0 16px;background:#f5f5f5;color:#1f1f1f;border:0;font-size:15px;letter-spacing:.06em;cursor:pointer}
.burger:hover{background:#e9e9e9}

/* 锚点条 */
.strip{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.94);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid #e8e8e8}
.strip-in{display:flex;gap:2px;overflow-x:auto;padding:6px clamp(10px,3vw,24px);scrollbar-width:none}
.strip-in::-webkit-scrollbar{display:none}
.strip-in a{flex:0 0 auto;display:inline-flex;align-items:center;min-height:40px;padding:0 13px;font-size:15px;color:#565656;white-space:nowrap;letter-spacing:.02em;transition:background .18s ease,color .18s ease}
.strip-in a:hover{background:#1f1f1f;color:#ffffff}

/* 主视觉 */
.hero{position:relative;margin:0;min-height:100vh;min-height:100dvh;display:grid;place-items:center;overflow:hidden;background:#1f1f1f;color:#ffffff;isolation:isolate}
.hero-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:-2;filter:grayscale(.2)}
.hero-veil{position:absolute;inset:0;z-index:-1;background:linear-gradient(180deg,rgba(10,10,10,.5) 0%,rgba(10,10,10,.82) 100%)}
.hero-word{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);z-index:-1;font-size:clamp(64px,21vw,230px);line-height:1;font-weight:600;letter-spacing:-.05em;white-space:nowrap;color:rgba(255,255,255,.085);pointer-events:none}
.hero-copy{max-width:920px;padding:0 22px;text-align:center}
.hero-num{display:block;margin-bottom:20px;font-size:13px;font-weight:400;letter-spacing:.42em;color:#c9c9c9}
.hero h1{margin:0;font-size:clamp(30px,7.2vw,70px);line-height:1.14;font-weight:600;letter-spacing:-.02em}
.hero-cta{display:inline-flex;align-items:center;justify-content:center;min-height:50px;margin-top:34px;padding:0 30px;background:#ffffff;color:#1f1f1f;font-size:16px;font-weight:500;letter-spacing:.04em;transition:background .18s ease,color .18s ease,transform .18s ease}
.hero-cta:hover{background:#1f1f1f;color:#ffffff;outline:1px solid #ffffff;transform:translateY(-2px)}

/* 版块网格 */
.bento{display:grid;grid-template-columns:minmax(0,1fr) 304px;gap:16px;align-items:start;padding:16px clamp(14px,4vw,32px) 72px;max-width:1440px;margin:0 auto}
.doc{display:grid;gap:16px;min-width:0}
.doc > section{padding:clamp(24px,4vw,54px);background:#f5f5f5;scroll-margin-top:92px;transition:background .2s ease;animation:fade .5s ease both}
.doc > section:nth-child(2){animation-delay:.05s}
.doc > section:nth-child(3){animation-delay:.1s}
.doc > section:nth-child(4){animation-delay:.15s}
.doc > section:nth-child(5){animation-delay:.2s}
.doc > section:nth-child(6){animation-delay:.25s}
.doc > section:nth-child(7){animation-delay:.3s}
.doc > section:first-child{background:#1f1f1f;color:#f0f0f0}
.doc > section:hover{background:#ededed}
.doc > section:first-child:hover{background:#2b2b2b}
.doc h2{margin:0 0 20px;font-size:clamp(22px,3.3vw,34px);line-height:1.25;font-weight:600;letter-spacing:-.01em}
.doc h2 span{display:inline-block;padding-bottom:7px;border-bottom:2px solid currentColor}
.doc h3{margin:28px 0 10px;font-size:20px;line-height:1.4;font-weight:600}
.doc h3 span{display:inline-block;padding-bottom:4px;border-bottom:1px solid currentColor}
.doc p{margin:0 0 16px}
.doc ul,.doc ol{margin:0 0 18px;padding-left:1.15em}
.doc li{margin-bottom:9px}
.doc blockquote{margin:22px 0;padding:2px 0 2px 18px;border-left:3px solid #1f1f1f;font-weight:500}
.doc > section:first-child blockquote{border-color:#ffffff}
.doc a{border-bottom:1px solid rgba(31,31,31,.35)}
.doc a:hover{border-color:#1f1f1f;background:rgba(31,31,31,.06)}
.doc > section:first-child a{color:#ffffff;border-bottom-color:rgba(255,255,255,.45)}
.doc > section:first-child a:hover{background:rgba(255,255,255,.12);border-color:#ffffff}
.doc figure{margin:22px 0;padding:0}
.doc figcaption{margin-top:10px;font-size:15px;color:#6d6d6d}
.doc img{width:100%}
.doc table{width:100%;border-collapse:collapse;font-size:16px}
.doc th,.doc td{padding:10px 12px;text-align:left;border-bottom:1px solid #dcdcdc}

/* 右侧栏 */
.rail{position:sticky;top:76px;display:grid;gap:16px}
.tile{background:#f5f5f5;padding:20px 18px;transition:background .18s ease,box-shadow .18s ease}
.tile:hover{background:#ededed;box-shadow:0 6px 18px rgba(0,0,0,.06)}
.rail h2{margin:0 0 14px;font-size:16px;line-height:1.4;font-weight:600;letter-spacing:.04em}
.rail h2 span{display:inline-block;padding-bottom:5px;border-bottom:2px solid #1f1f1f}
.rail ol{list-style:none;margin:0;padding:0;counter-reset:jump}
.rail li{counter-increment:jump}
.rail li a{display:flex;align-items:center;gap:9px;min-height:40px;font-size:16px;color:#3d3d3d;border-bottom:1px solid #e3e3e3}
.rail li a::before{content:counter(jump,decimal-leading-zero);font-size:12px;letter-spacing:.1em;color:#9c9c9c;font-weight:400}
.rail li a:hover{color:#1f1f1f;background:#e4e4e4;padding-left:6px;transition:padding .18s ease,background .18s ease}
.top{display:inline-flex;align-items:center;min-height:40px;padding:0 14px;background:#1f1f1f;color:#ffffff;font-size:16px}
.top:hover{background:#454545}

/* 页脚 */
.foot{border-top:1px solid #e8e8e8;padding:52px clamp(14px,4vw,32px) 26px;background:#ffffff}
.foot-top{display:grid;grid-template-columns:1.1fr 1fr 1fr;gap:34px;max-width:1200px;margin:0 auto}
.f-mark{display:inline-flex;align-items:center;justify-content:center;min-height:44px;min-width:44px;padding:0 12px;margin:0 0 14px;background:#1f1f1f;color:#ffffff;font-size:14px;font-weight:600;letter-spacing:.06em;white-space:nowrap;max-width:100%;overflow:hidden}
.foot address{font-style:normal;font-size:16px;color:#4d4d4d}
.f-nav dl{margin:0;display:grid;gap:1px}
.f-nav dt,.f-nav dd{margin:0}
.f-nav a{display:inline-flex;align-items:center;min-height:40px;font-size:16px;color:#3d3d3d}
.f-nav a:hover{color:#1f1f1f;text-decoration:underline;text-underline-offset:4px}
.sub{display:grid;gap:8px;margin-bottom:16px}
.sub label{font-size:16px;font-weight:600}
.sub input{min-height:46px;padding:0 12px;border:0;border-radius:0;background:#f5f5f5;font-family:inherit;font-size:16px;color:#1f1f1f}
.sub input:focus{outline:2px solid #1f1f1f;outline-offset:-2px}
.sub button{min-height:46px;border:0;border-radius:0;background:#1f1f1f;color:#ffffff;font-size:16px;letter-spacing:.06em;cursor:pointer}
.sub button:hover{background:#454545}
.f-links{list-style:none;margin:0;padding:0}
.f-links a{display:inline-flex;align-items:center;min-height:40px;font-size:16px;color:#3d3d3d}
.f-links a:hover{color:#1f1f1f;text-decoration:underline;text-underline-offset:4px}
.foot-bar{max-width:1200px;margin:30px auto 0;padding-top:16px;border-top:1px solid #e8e8e8;font-size:15px;color:#8d8d8d}

/* 全屏菜单 */
.menu{position:fixed;inset:0;z-index:60;display:grid;grid-template-rows:auto 1fr auto;padding:18px clamp(16px,5vw,44px) 24px;background:#1f1f1f;color:#ffffff;transform:translateY(-102%);visibility:hidden;transition:transform .34s ease,visibility .34s ease}
.menu.is-open{transform:none;visibility:visible}
.menu-x{justify-self:end;min-height:44px;padding:0 18px;border:0;background:#ffffff;color:#1f1f1f;font-size:16px;letter-spacing:.06em;cursor:pointer}
.menu-x:hover{background:#d8d8d8}
.menu-nav{display:grid;align-content:center;gap:0;max-width:820px;margin:0 auto;width:100%}
.menu-nav a{display:flex;align-items:center;gap:16px;min-height:58px;font-size:clamp(20px,4.6vw,32px);font-weight:500;letter-spacing:-.01em;color:#ffffff;border-bottom:1px solid rgba(255,255,255,.16);transition:padding .2s ease,color .2s ease}
.menu-nav a span{font-size:12px;font-weight:400;letter-spacing:.16em;color:#8f8f8f}
.menu-nav a:hover{padding-left:10px;color:#ffffff}
.menu-foot{margin:0;text-align:center;font-size:14px;letter-spacing:.2em;color:#8f8f8f}

@keyframes fade{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}

@media (max-width:980px){
.bento{grid-template-columns:minmax(0,1fr)}
.rail{position:static;grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
body{font-size:17px}
.hero-num{margin-bottom:14px}
.contact{padding:0 12px}
.mark{font-size:13px}
.doc > section{padding:22px 18px}
.doc table{font-size:15px}
.rail{grid-template-columns:1fr}
.foot-top{grid-template-columns:1fr;gap:26px}
.foot{padding-top:36px}
}
@media (prefers-reduced-motion:reduce){
html{scroll-behavior:auto}
*,*::before,*::after{transition:none !important;animation:none !important}
.menu{transition:none}
}

button[aria-expanded]{min-width:44px;min-height:44px}