:root{
  --bg:#EEF0F8;--deep-bg:#E0E4F2;--surface:#F7F8FD;--surface-2:#EBEEF8;
  --title:#1A1840;--text:#2C2A48;--muted:#5A5680;--soft:#7A76A0;
  --purple:#5B4BDB;--blue:#3A6BD4;--deep:#1C1A3A;--mist:#8AA4E0;--lilac:#8A6AD4;
  --border:rgba(58,107,212,.18);--border-strong:rgba(91,75,219,.42);
  --shadow:0 12px 28px rgba(28,26,58,.08);--radius:12px;--max:1000px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;overflow-x:hidden}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;font-size:15px;line-height:1.7;overflow-x:hidden;padding-top:118px}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
img{max-width:100%;display:block;object-fit:contain;object-position:center}
.skip-link{position:fixed;left:16px;top:-60px;z-index:120;background:var(--surface);color:var(--title);padding:10px 14px;border-radius:8px;border:1px solid var(--border-strong)}
.skip-link:focus{top:8px}
.address-bar{position:fixed;top:0;left:0;right:0;height:22px;background:var(--deep);color:var(--surface);z-index:90;font-size:12px}
.address-inner,.window-header-inner,.section-tabs-inner,.site-main,.footer-inner{width:min(calc(100% - 32px),var(--max));margin:0 auto}
.address-inner{height:22px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.plain-trigger{border:0;background:transparent;color:inherit;padding:0 2px;min-height:22px;cursor:pointer}
.window-header{position:fixed;top:22px;left:0;right:0;height:54px;background:var(--surface-2);border-bottom:1px solid var(--border-strong);z-index:89}
.window-header-inner{height:54px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px}
.brand-link{justify-self:start;display:inline-flex;align-items:center;min-height:44px;max-width:240px}
.brand-logo,.footer-logo,.drawer-logo{height:24px;width:auto;object-fit:contain}
.brand-fallback{font-size:16px;font-weight:800;color:var(--title)}
.app-entry{justify-self:center;display:inline-flex;align-items:center;min-height:44px;font-weight:700;color:var(--purple)}
.drawer-trigger{justify-self:end;min-height:44px;padding:0 14px;border:1px solid var(--border-strong);background:var(--surface);color:var(--title);border-radius:10px;cursor:pointer}
.section-tabs{position:fixed;top:76px;left:0;right:0;height:42px;background:var(--surface);z-index:88;border-bottom:1px solid var(--border)}
.section-tabs-inner{height:42px;display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap;overflow:hidden}
.section-tabs a{display:inline-flex;align-items:center;justify-content:center;min-height:32px;padding:0 16px;border:1px solid var(--border);border-radius:999px;color:var(--muted);font-size:13px}
.section-tabs a.active{background:var(--purple);color:var(--surface);border-color:var(--purple)}
.site-main{padding:34px 0 72px;min-height:60vh}
.page-hero{margin-bottom:28px}.eyebrow{color:var(--purple);font-weight:700;font-size:13px;letter-spacing:.05em}
h1,h2,h3{color:var(--title);margin:0 0 12px;line-height:1.3}h1{font-size:24px}h2{font-size:20px}h3{font-size:16px}
p{margin:0 0 14px}.lead{font-size:16px;color:var(--muted);max-width:760px}.muted{color:var(--muted)}
.section-block{margin:30px 0;padding:24px;background:var(--surface);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow)}
.section-block.plain{background:transparent;box-shadow:none;border:0;padding:0}.section-intro{max-width:780px;margin-bottom:18px}.section-label{display:inline-flex;align-items:center;min-height:28px;padding:0 10px;border-radius:999px;background:var(--surface-2);color:var(--purple);font-size:12px;font-weight:700;margin-bottom:10px}
.media-slot{background:var(--surface-2);border:1px solid var(--border);border-radius:12px;display:flex;align-items:center;justify-content:center;overflow:hidden}.media-slot img{width:100%;height:100%;object-fit:contain}.slot-168{height:168px}.slot-176{height:176px}.slot-app{height:320px;max-width:320px;margin:0 auto}.slot-standard{height:220px}
.button-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:0 18px;border-radius:10px;font-size:14px;font-weight:700;border:1px solid transparent}.button.primary{background:linear-gradient(135deg,#8AA4E0 0%,#5B4BDB 55%,#3A6BD4 100%);color:var(--surface)}.button.secondary{background:var(--surface-2);color:var(--deep);border-color:var(--border-strong)}
a:hover,.plain-trigger:hover,.drawer-trigger:hover,.close-button:hover{opacity:.86}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid rgba(91,75,219,.28);outline-offset:2px}
.window-demo{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(280px,.9fr);gap:22px;align-items:center}.window-frame{padding:10px;border-radius:14px;background:var(--deep);box-shadow:var(--shadow)}.window-frame .window-controls{height:24px;display:flex;gap:6px;align-items:center;padding:0 4px}.window-dot{width:8px;height:8px;border-radius:50%;background:var(--mist)}.window-frame .media-slot{background:var(--surface)}
.long-copy{max-width:820px}.long-copy p{margin-bottom:16px}.copy-columns{columns:2;column-gap:34px}.copy-columns p{break-inside:avoid}
.stair-stack{display:grid;gap:14px;max-width:820px}.stair-card{padding:18px;background:var(--surface);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow)}.stair-card:nth-child(2){transform:translateX(24px)}.stair-card .media-slot{margin-bottom:14px}
.tag-wrap{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0}.tag-wrap span,.tag-wrap a{display:inline-flex;align-items:center;min-height:36px;padding:0 14px;border-radius:999px;background:var(--surface-2);border:1px solid var(--border);color:var(--title);font-weight:700}
.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.compare-panel{padding:20px;border-radius:14px;border:1px solid var(--border);background:var(--surface)}.compare-panel.deep{background:var(--deep);color:var(--surface)}.compare-panel.deep h2,.compare-panel.deep h3{color:var(--surface)}
.path-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.path-step{position:relative;padding:22px 16px;background:var(--surface);border:1px solid var(--border);border-radius:12px}.path-step strong{display:block;color:var(--title);margin-bottom:6px}.path-step:not(:last-child)::after{content:"→";position:absolute;right:-12px;top:50%;transform:translateY(-50%);color:var(--purple);font-weight:800;z-index:2}
.center-cards{display:grid;grid-template-columns:repeat(2,minmax(0,340px));justify-content:center;gap:18px}.center-card{padding:22px;text-align:center;background:var(--surface);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow)}
.product-card{max-width:760px;margin:0 auto;padding:26px;background:var(--surface);border:1px solid var(--border-strong);border-radius:14px;box-shadow:var(--shadow);text-align:center}.product-icon{width:48px;height:48px;margin:0 auto 12px}.product-card .slot-app{margin-top:18px}.product-card p{max-width:650px;margin-left:auto;margin-right:auto}
.note-list,.tool-list{display:grid;gap:12px}.note-item,.tool-item{padding:18px;background:var(--surface);border:1px solid var(--border);border-radius:12px}.tool-item{display:grid;grid-template-columns:150px 1fr;gap:16px}.tool-item strong{color:var(--title)}
.term-list{display:grid;gap:16px}.term-item{padding:20px 0;border-bottom:1px solid var(--border)}.term-item:last-child{border-bottom:0}.term-item h2{font-size:18px}.term-item h3{margin-top:12px}
.faq-list{display:grid;gap:14px}.faq-item{padding:20px;background:var(--surface);border:1px solid var(--border);border-radius:12px}.faq-item h2{font-size:16px;margin-bottom:8px}
.help-index{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.help-card{padding:20px;background:var(--surface);border:1px solid var(--border);border-radius:12px}.help-card a{color:var(--purple);font-weight:700}
.statement{padding:28px;background:linear-gradient(135deg,var(--surface),var(--surface-2));border:1px solid var(--border-strong);border-radius:14px}.statement .media-slot{margin-bottom:18px}
.rule-box{padding:18px;background:var(--deep);color:var(--surface);border-radius:12px}.rule-box h2,.rule-box h3{color:var(--surface)}
.site-footer{background:var(--deep);color:var(--bg);border-top:1px solid var(--mist);font-size:13px}.footer-inner{padding:34px 0 72px}.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:22px}.footer-logo-link{display:inline-flex;align-items:center;min-height:44px}.footer-brand div{display:flex;flex-direction:column}.footer-brand strong{font-size:15px}.footer-brand span{color:#D8DDF1}.footer-links{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:24px}.footer-links h2{font-size:13px;color:var(--surface);margin-bottom:8px}.footer-links a{display:block;color:#D8DDF1;margin:5px 0}.footer-note{max-width:850px;color:#D8DDF1}.copyright{color:#BFC7E6;margin-bottom:0}
.overlay{position:fixed;inset:0;background:rgba(28,26,58,.38);z-index:100;opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.overlay.is-open{opacity:1;visibility:visible;pointer-events:auto}.tool-drawer{position:fixed;right:18px;bottom:18px;width:360px;max-height:70vh;background:var(--surface);border:1px solid var(--border-strong);border-radius:14px;box-shadow:0 24px 60px rgba(28,26,58,.2);z-index:110;transform:translateY(18px) scale(.98);opacity:0;visibility:hidden;pointer-events:none;transition:.2s;overflow:hidden}.tool-drawer.is-open{transform:none;opacity:1;visibility:visible;pointer-events:auto}.drawer-head{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-bottom:1px solid var(--border)}.drawer-brand{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--title)}.close-button{min-height:40px;padding:0 12px;border:1px solid var(--border);border-radius:9px;background:var(--surface-2);color:var(--title);cursor:pointer}.drawer-scroll{overflow:auto;max-height:calc(70vh - 70px);padding:10px 16px 16px}.drawer-group{padding:10px 0;border-bottom:1px solid var(--border)}.drawer-group:last-child{border-bottom:0}.drawer-group h2{font-size:13px;color:var(--purple);margin-bottom:6px}.drawer-group a{display:grid;grid-template-columns:105px 1fr;gap:10px;padding:8px 0;align-items:start}.drawer-group a strong{font-size:14px}.drawer-group a span{font-size:12px;color:var(--muted)}
.search-layer{position:fixed;top:76px;left:0;right:0;z-index:109;visibility:hidden;opacity:0;pointer-events:none;transform:translateY(-8px);transition:.2s}.search-layer.is-open{visibility:visible;opacity:1;pointer-events:auto;transform:none}.search-card{width:min(calc(100% - 32px),760px);margin:10px auto 0;background:var(--surface-2);border:1px solid var(--border-strong);border-radius:14px;padding:18px;box-shadow:var(--shadow)}.search-head{display:flex;align-items:center;justify-content:space-between;gap:12px}.search-card label{display:block;font-size:13px;color:var(--muted);margin:10px 0 6px}.search-card input{width:100%;min-height:44px;border:1px solid var(--border-strong);border-radius:10px;padding:0 12px;background:var(--surface);color:var(--text)}.search-presets{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}.search-presets a{display:inline-flex;min-height:38px;align-items:center;padding:0 12px;border-radius:999px;background:var(--surface);border:1px solid var(--border)}.search-status{font-size:12px;color:var(--muted);margin:12px 0 0}.modal-open{overflow:hidden}
.mobile-bottom-nav{display:none}
.hero-slim{display:grid;grid-template-columns:1fr 340px;gap:22px;align-items:center}.hero-copy{padding:8px 0}.bullet-pairs{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.bullet-card{padding:18px;border-radius:12px;background:var(--surface);border:1px solid var(--border)}
@media (max-width:760px){
  body{padding-top:76px;padding-bottom:calc(58px + env(safe-area-inset-bottom))}.section-tabs{display:none}.site-main{padding-top:26px}.window-header-inner{grid-template-columns:minmax(0,1fr) auto auto;gap:6px}.brand-link{max-width:150px;overflow:hidden}.app-entry{font-size:13px;padding:0 4px}.drawer-trigger{padding:0 10px;font-size:13px}.address-inner,.window-header-inner,.site-main,.footer-inner{width:calc(100% - 32px)}.window-demo,.compare-grid,.hero-slim{grid-template-columns:1fr}.copy-columns{columns:1}.stair-card:nth-child(2){transform:none}.path-row{grid-template-columns:1fr}.path-step:not(:last-child)::after{content:"↓";right:auto;left:50%;top:auto;bottom:-19px;transform:translateX(-50%)}.center-cards,.help-index,.bullet-pairs{grid-template-columns:1fr}.tool-item{grid-template-columns:1fr;gap:6px}.footer-links{grid-template-columns:repeat(2,1fr)}.footer-inner{padding-bottom:84px}.tool-drawer{width:92%;right:4%;bottom:calc(58px + env(safe-area-inset-bottom));max-height:70vh}.drawer-scroll{max-height:calc(70vh - 70px)}.search-layer{top:0;bottom:0;background:var(--deep);display:flex;align-items:flex-start;visibility:hidden}.search-layer.is-open{visibility:visible}.search-card{margin:96px 16px 0;width:calc(100% - 32px);background:var(--deep);color:var(--surface);border-color:rgba(138,164,224,.45)}.search-card strong,.search-card label{color:var(--surface)}.search-card p,.search-status{color:#D8DDF1}.search-card input{background:var(--surface);color:var(--text)}.search-presets a{background:#2B2850;color:var(--surface);border-color:rgba(138,164,224,.35)}.search-card .close-button{background:#2B2850;color:var(--surface);border-color:rgba(138,164,224,.35)}.mobile-bottom-nav{position:fixed;left:0;right:0;bottom:0;z-index:95;display:grid;grid-template-columns:repeat(4,1fr);height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:var(--surface);border-top:1px solid var(--border-strong)}.mobile-bottom-nav a{display:flex;align-items:center;justify-content:center;min-height:48px;font-size:13px;color:var(--muted)}.mobile-bottom-nav a.active{background:var(--purple);color:var(--surface)}.slot-app{height:280px}.section-block{padding:18px}.window-demo{gap:16px}.footer-brand{align-items:flex-start}
}