:root{
    --bg:#EEF0F8;--deep-bg:#E0E4F2;--panel:#F7F8FD;--panel-2:#EBEEF8;
    --title:#1A1840;--text:#2C2A48;--muted:#5A5680;--soft:#7A76A0;
    --purple:#5B4BDB;--blue:#3A6BD4;--dark:#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:"Microsoft YaHei","PingFang SC","Noto Sans CJK SC",Arial,sans-serif;font-size:15px;line-height:1.7;overflow-x:hidden}
body.panel-locked{overflow:hidden}
a{color:inherit;text-decoration:none}
a,button{touch-action:manipulation}
button{font:inherit}
img{display:block;max-width:100%;object-fit:contain;object-position:center}
.site-top{position:fixed;inset:0 0 auto 0;z-index:1000}
.address-bar{height:22px;background:var(--dark);color:#F7F8FD;font-size:12px}
.top-inner{max-width:var(--max);margin:0 auto;padding:0 18px}
.address-bar .top-inner{height:22px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.address-brand{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.search-open{height:22px;border:0;background:transparent;color:#F7F8FD;padding:0 4px;cursor:pointer}
.window-header{height:54px;background:var(--deep-bg);border-bottom:1px solid var(--border-strong)}
.header-row{height:54px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px}
.brand-link{justify-self:start;min-height:44px;display:flex;align-items:center;color:var(--title);font-size:16px;font-weight:700}
.header-logo{height:24px;width:auto}
.brand-fallback{white-space:nowrap}
.app-link,.drawer-open{height:44px;display:inline-flex;align-items:center;justify-content:center;padding:0 14px;border-radius:10px;font-size:14px;font-weight:700}
.app-link{justify-self:center;color:var(--purple);border:1px solid var(--border-strong);background:var(--panel)}
.drawer-open{justify-self:end;border:0;background:linear-gradient(135deg,#8AA4E0 0%,#5B4BDB 55%,#3A6BD4 100%);color:#F7F8FD;cursor:pointer}
.tab-bar{height:42px;background:var(--panel);border-bottom:1px solid var(--border)}
.tab-inner{max-width:var(--max);min-height:42px;margin:0 auto;padding:5px 18px;display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap}
.tab-link{min-height:32px;padding:5px 14px;border-radius:999px;font-size:13px;color:var(--text);border:1px solid transparent;display:inline-flex;align-items:center}
.tab-link:hover,.tab-link:focus-visible{border-color:var(--border-strong);outline:none}
.tab-link.active{background:var(--purple);color:#F7F8FD}
.site-main{padding:144px 16px 54px;min-height:70vh}
.page-shell{max-width:var(--max);margin:0 auto}
h1,h2,h3{color:var(--title);margin-top:0}h1{font-size:24px;line-height:1.3;margin-bottom:14px}h2{font-size:20px;line-height:1.4}h3{font-size:16px;line-height:1.5}
p{margin:0 0 14px}
.lead{font-size:16px;color:var(--muted);max-width:760px}
.eyebrow{font-size:12px;letter-spacing:.08em;color:var(--purple);font-weight:700;text-transform:uppercase;margin-bottom:8px}.eyebrow-inverse{color:#C9D4F2}
.section-block{margin:34px 0;padding:26px;border-radius:14px;background:var(--panel);border:1px solid var(--border);box-shadow:var(--shadow)}
.section-plain{margin:38px 0}
.media-slot{width:100%;background:linear-gradient(180deg,var(--panel-2),var(--deep-bg));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-220{height:220px}.slot-260{height:260px}.slot-320{height:320px}.slot-icon{width:64px;height:64px;border-radius:14px}.slot-icon img{width:48px;height:48px}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.btn{min-height:44px;padding:0 17px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;white-space:nowrap;border:1px solid var(--border-strong)}
.btn-primary{background:linear-gradient(135deg,#8AA4E0 0%,#5B4BDB 55%,#3A6BD4 100%);color:#F7F8FD;border-color:transparent}
.btn-secondary{background:var(--panel);color:var(--dark)}
.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow)}
.btn:focus-visible,a:focus-visible,button:focus-visible{outline:3px solid rgba(138,164,224,.65);outline-offset:2px}

/* 首页 */
.hero-window{max-width:840px;margin:0 auto 38px;background:var(--panel);border:1px solid var(--border-strong);border-radius:14px;overflow:hidden;box-shadow:var(--shadow)}
.hero-window .window-dots{height:28px;background:var(--deep-bg);display:flex;align-items:center;gap:6px;padding:0 12px;border-bottom:1px solid var(--border)}
.hero-window .window-dots i{display:block;width:8px;height:8px;border-radius:50%;background:var(--mist)}
.hero-body{padding:22px}
.hero-body .media-slot{margin-bottom:22px}
.home-longread{max-width:840px;margin:0 auto 44px}
.home-longread .media-slot{margin:18px 0}
.stair-wrap{max-width:840px;margin:0 auto 44px}.stair-card{width:calc(100% - 24px);background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:22px;margin:14px 0;box-shadow:var(--shadow)}.stair-card:nth-child(2){margin-left:24px}.stair-card .media-slot{margin-bottom:16px}
.tag-panel{max-width:840px;margin:0 auto 44px;background:var(--deep-bg);border-radius:14px;padding:24px;border:1px solid var(--border)}
.tag-wrap{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0}.tag{display:inline-flex;min-height:38px;align-items:center;padding:0 14px;border-radius:999px;background:var(--panel);border:1px solid var(--border-strong);color:var(--dark);font-weight:700}
.compare-grid{max-width:900px;margin:0 auto 44px;display:grid;grid-template-columns:1fr 1fr;gap:18px}.compare-card{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:22px;box-shadow:var(--shadow)}.compare-card .media-slot{margin-bottom:16px}
.path-strip{max-width:900px;margin:0 auto 44px;background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:24px}.path-steps{display:flex;align-items:stretch;gap:10px;flex-wrap:wrap;margin:18px 0}.path-step{flex:1 1 180px;background:var(--panel-2);border:1px solid var(--border);border-radius:12px;padding:16px}.path-step b{display:block;color:var(--purple);margin-bottom:5px}
.center-pair{max-width:760px;margin:0 auto 44px;display:grid;grid-template-columns:1fr 1fr;gap:16px}.center-card{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:24px;text-align:center;box-shadow:var(--shadow)}.center-card .media-slot{margin-bottom:14px}
.product-card{max-width:700px;margin:0 auto 48px;background:var(--dark);color:#F7F8FD;border-radius:14px;padding:26px;box-shadow:var(--shadow)}.product-card h2,.product-card h1,.product-card h3{color:#F7F8FD}.product-card .lead,.product-card p{color:#EEF0F8}.product-visuals{display:grid;grid-template-columns:64px 1fr;gap:16px;align-items:start;margin:18px 0}.product-visuals .app-portrait{height:300px;background:#F7F8FD;border-radius:12px;padding:10px}.product-visuals .app-portrait img{height:100%;width:100%}
.prose-stack{max-width:840px;margin:0 auto}.prose-stack section{margin:36px 0}.note-band{padding:20px 22px;background:var(--deep-bg);border-left:4px solid var(--purple);border-radius:0 12px 12px 0}
.faq-mini{display:grid;grid-template-columns:1fr 1fr;gap:14px}.faq-mini article{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:18px}

/* 内页通用变体 */
.page-head{max-width:840px;margin:0 auto 28px}.page-head .lead{margin-bottom:0}
.window-demo{max-width:900px;margin:0 auto}.browser-frame{background:var(--panel);border:1px solid var(--border-strong);border-radius:14px;overflow:hidden;box-shadow:var(--shadow)}.frame-top{height:34px;background:var(--deep-bg);border-bottom:1px solid var(--border);display:flex;align-items:center;gap:6px;padding:0 12px}.frame-top i{width:8px;height:8px;border-radius:50%;background:var(--mist)}.frame-content{padding:24px}.frame-content .media-slot{margin-bottom:20px}
.stair-page{max-width:880px;margin:0 auto}.stair-page .stair-card:nth-child(2){margin-left:24px}.stair-page .stair-card:nth-child(3){margin-left:10px}
.wrap-tag-page{max-width:900px;margin:0 auto}.tag-intro{padding:24px;background:var(--deep-bg);border-radius:14px;border:1px solid var(--border)}.tag-sections{display:flex;flex-wrap:wrap;gap:14px;margin-top:18px}.tag-section{flex:1 1 280px;background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:20px}
.reading-sheet{max-width:780px;margin:0 auto;background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:30px;box-shadow:var(--shadow)}.reading-sheet .reading-controls{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}.reading-controls span{padding:8px 12px;border-radius:10px;background:var(--panel-2);border:1px solid var(--border);font-weight:700}
.tool-list{max-width:880px;margin:0 auto}.tool-row{display:grid;grid-template-columns:140px 1fr;gap:18px;padding:20px 0;border-bottom:1px solid var(--border)}.tool-row:last-child{border-bottom:0}.tool-name{font-weight:700;color:var(--purple)}
.split-page{max-width:920px;margin:0 auto}.split-visual{display:grid;grid-template-columns:1fr 1fr;gap:2px;border:1px solid var(--border-strong);border-radius:14px;overflow:hidden;background:var(--border-strong);box-shadow:var(--shadow)}.split-pane{background:var(--panel);padding:24px}.split-pane.secondary{background:var(--deep-bg)}
.route-page{max-width:880px;margin:0 auto}.route-list{display:grid;gap:14px}.route-item{display:grid;grid-template-columns:90px 1fr;gap:18px;align-items:start;background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:20px}.route-index{font-weight:700;color:var(--purple);font-size:16px}
.memo-page{max-width:820px;margin:0 auto}.memo-list{counter-reset:memo;display:grid;gap:14px}.memo-item{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:20px 20px 20px 64px;position:relative}.memo-item:before{counter-increment:memo;content:counter(memo);position:absolute;left:18px;top:18px;width:30px;height:30px;border-radius:10px;background:var(--purple);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700}
.centered-info{max-width:760px;margin:0 auto;text-align:center}.centered-info .info-card{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:26px;margin:16px auto;box-shadow:var(--shadow);text-align:left}
.terms-page{max-width:820px;margin:0 auto}.terms-page section{padding:22px 0;border-bottom:1px solid var(--border)}.terms-page section:last-child{border-bottom:0}.terms-page h2{display:flex;align-items:center;gap:10px}.terms-page h2:before{content:"";width:8px;height:8px;border-radius:3px;background:var(--purple);flex:0 0 auto}
.install-steps{max-width:860px;margin:0 auto}.install-step{display:grid;grid-template-columns:56px 1fr;gap:16px;padding:20px;background:var(--panel);border:1px solid var(--border);border-radius:12px;margin:14px 0}.install-step .num{width:44px;height:44px;border-radius:12px;background:var(--deep-bg);display:flex;align-items:center;justify-content:center;color:var(--purple);font-weight:700}
.help-grid{max-width:900px;margin:0 auto;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.help-card{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:22px}.help-card a{color:var(--purple);font-weight:700}
.faq-page{max-width:860px;margin:0 auto}.faq-item{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:22px;margin:14px 0}.faq-item h2{font-size:17px;margin-bottom:10px}
.contact-flow{max-width:840px;margin:0 auto}.contact-row{display:grid;grid-template-columns:170px 1fr;gap:20px;padding:22px 0;border-bottom:1px solid var(--border)}.contact-row:last-child{border-bottom:0}.contact-row h2{font-size:17px}
.brand-statement{max-width:840px;margin:0 auto}.brand-cover{background:var(--dark);color:#F7F8FD;border-radius:14px;padding:28px;margin-bottom:26px}.brand-cover h1,.brand-cover h2{color:#F7F8FD}.brand-cover .media-slot{background:#F7F8FD;margin-bottom:20px}.brand-points{display:grid;grid-template-columns:1fr 1fr;gap:16px}.brand-points article{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:20px}

.site-footer{background:var(--dark);color:#EEF0F8;border-top:1px solid var(--mist);font-size:13px;padding:36px 16px 72px}.footer-inner{max-width:var(--max);margin:0 auto}.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:24px}.footer-logo{height:24px;width:auto}.footer-brand div{display:flex;flex-direction:column}.footer-brand strong{font-size:16px}.footer-brand span{font-size:12px;color:#C9D4F2}.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.footer-grid h2{color:#F7F8FD;font-size:14px;margin-bottom:8px}.footer-grid a{display:block;color:#EEF0F8;padding:5px 0}.footer-note{margin-top:24px;padding-top:18px;border-top:1px solid rgba(138,164,224,.3);color:#DDE3F5}.footer-copy{color:#BFC9E6;margin-bottom:0}
.page-mask{position:fixed;inset:0;background:rgba(28,26,58,.46);z-index:1100;opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.page-mask.open{opacity:1;visibility:visible;pointer-events:auto}
.tool-drawer{position:fixed;right:18px;bottom:18px;width:360px;max-height:70vh;background:var(--panel);border:1px solid var(--border-strong);border-radius:14px;z-index:1200;box-shadow:0 18px 48px rgba(28,26,58,.22);visibility:hidden;opacity:0;pointer-events:none;transform:translateY(12px);transition:.2s;display:flex;flex-direction:column}.tool-drawer.open{visibility:visible;opacity:1;pointer-events:auto;transform:none}.drawer-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 16px;border-bottom:1px solid var(--border)}.drawer-brand{display:flex;align-items:center;gap:10px}.drawer-logo{height:24px;width:auto}.panel-close{min-height:44px;padding:0 12px;border-radius:10px;border:1px solid var(--border-strong);background:var(--panel);color:var(--dark);cursor:pointer}.drawer-scroll{overflow-y:auto;padding:8px 14px 16px}.drawer-scroll section{margin:10px 0}.drawer-scroll h2{font-size:14px;margin:8px 0;color:var(--muted)}.drawer-scroll a{display:grid;grid-template-columns:92px 1fr;gap:8px;padding:10px;border-radius:10px}.drawer-scroll a:hover{background:var(--panel-2)}.drawer-scroll b{color:var(--title)}.drawer-scroll span{font-size:12px;color:var(--muted)}
.search-layer{position:fixed;top:76px;left:0;right:0;z-index:1200;visibility:hidden;opacity:0;pointer-events:none;transition:.2s}.search-layer.open{visibility:visible;opacity:1;pointer-events:auto}.search-card{max-width:780px;margin:0 auto;background:var(--deep-bg);border:1px solid var(--border-strong);border-radius:0 0 14px 14px;padding:22px;box-shadow:var(--shadow)}.search-head{display:flex;justify-content:space-between;gap:16px;align-items:flex-start}.search-head strong{font-size:18px;color:var(--title)}.search-head p{font-size:13px;color:var(--muted);margin:4px 0 0}.search-presets{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0}.search-presets a{min-height:44px;display:inline-flex;align-items:center;padding:0 16px;border-radius:10px;background:var(--panel);border:1px solid var(--border-strong);font-weight:700}.search-tip{font-size:13px;color:var(--muted);margin:0}
.mobile-bottom{display:none}

@media (max-width:760px){
    .top-inner{padding:0 16px}.tab-bar{display:none}.site-main{padding:98px 16px 78px}.header-row{grid-template-columns:minmax(0,1fr) auto auto;gap:6px}.brand-link{min-width:0}.brand-fallback{overflow:hidden;text-overflow:ellipsis}.app-link,.drawer-open{padding:0 10px;font-size:13px}
    .compare-grid,.center-pair,.help-grid,.brand-points{grid-template-columns:1fr}.stair-card,.stair-page .stair-card{width:100%;margin-left:0!important}.faq-mini{grid-template-columns:1fr}.product-visuals{grid-template-columns:1fr}.product-visuals .slot-icon{margin:0 auto}.product-visuals .app-portrait{height:300px}.tool-row,.route-item,.contact-row{grid-template-columns:1fr;gap:8px}.split-visual{grid-template-columns:1fr}.section-block{padding:20px}.reading-sheet{padding:22px}.footer-grid{grid-template-columns:1fr 1fr}.site-footer{padding-bottom:92px}
    .tool-drawer{right:4%;bottom:68px;width:92%;max-height:70vh}.search-layer{top:0;bottom:0;background:var(--dark)}.search-card{max-width:none;height:100%;border:0;border-radius:0;background:var(--dark);color:#F7F8FD;padding:92px 20px 24px;overflow-y:auto}.search-head strong{color:#F7F8FD}.search-head p,.search-tip{color:#DDE3F5}.search-presets a{background:#F7F8FD;color:var(--dark)}.search-card .panel-close{background:transparent;color:#F7F8FD;border-color:rgba(247,248,253,.45)}
    .mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:1050;height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);display:grid;grid-template-columns:repeat(4,1fr);background:var(--panel);border-top:1px solid var(--border-strong)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;min-height:48px;font-size:13px}.mobile-bottom a.active{background:var(--purple);color:#F7F8FD}
}
@media (max-width:420px){.address-brand{max-width:250px}.footer-grid{grid-template-columns:1fr}.product-visuals .app-portrait{height:280px}}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}