:root{
  --bg:#F4FAFC;--surface:#FFFFFF;--soft:#E7F3F6;--ink:#0E3A46;--text:#24505A;--muted:#4A7380;--faint:#7A9AA4;
  --brand:#1A7F8F;--bright:#2BB3C4;--deep:#0F5B68;--pale:#D7EEF2;--line:rgba(26,127,143,.16);
  --shadow:0 14px 34px rgba(14,58,70,.08);--radius:16px;--max:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--bg)}
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;line-height:1.75;overflow-x:hidden}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
button{cursor:pointer}
img{display:block;max-width:100%}
.site-header{position:fixed;z-index:60;top:0;left:0;right:0;box-shadow:0 2px 12px rgba(14,58,70,.04)}
.mist-line{height:20px;background:var(--ink);color:#fff;font-size:12px}
.top-inner,.dock-inner,.tabs-inner{width:min(var(--max),calc(100% - 32px));margin:0 auto;display:flex;align-items:center}
.top-inner{height:20px;justify-content:space-between}.mist-brand{font-weight:700;letter-spacing:.04em}
.icon-text-btn{height:20px;border:0;background:transparent;color:#fff;padding:0 4px;font-size:12px}
.dock-bar{height:62px;background:#fff;border-bottom:1px solid var(--line)}.dock-inner{height:62px;display:grid;grid-template-columns:1fr auto 1fr;gap:16px}
.brand-lockup{justify-self:start;display:flex;align-items:center;min-width:0}.brand-logo{height:34px;width:auto;max-width:210px;object-fit:contain}.brand-text{font-size:21px;font-weight:800;color:var(--ink)}
.drawer-open,.app-link,.btn{min-height:44px;border-radius:12px;border:1px solid var(--line);display:inline-flex;align-items:center;justify-content:center;padding:0 18px;font-weight:700}
.drawer-open{background:var(--soft);color:var(--deep)}.app-link{justify-self:end;background:linear-gradient(135deg,var(--bright) 0%,var(--brand) 55%,var(--deep) 100%);color:#fff;border-color:transparent}
.shell-tabs{height:42px;background:var(--pale);border-bottom:1px solid var(--line)}.tabs-inner{height:42px;gap:6px}.tabs-inner a{display:flex;align-items:center;height:30px;padding:0 13px;border-radius:8px;color:var(--deep);font-size:14px;font-weight:700}.tabs-inner a.is-current{background:var(--brand);color:#fff}
.site-main{padding-top:148px;padding-bottom:20px;min-height:65vh}.container{width:min(var(--max),calc(100% - 32px));margin:0 auto}
.hero,.page-hero{margin:22px auto 28px}.hero-media,.section-media,.page-media{background:linear-gradient(180deg,#fff,var(--soft));border:1px solid var(--line);border-radius:18px;overflow:hidden;display:flex;align-items:center;justify-content:center}.hero-media{min-height:220px;max-height:300px}.hero-media img{width:100%;height:min(300px,42vw);object-fit:contain;object-position:center}.hero-fallback{min-height:220px;padding:36px;text-align:center;color:var(--ink)}
.eyebrow{display:inline-block;color:var(--brand);font-weight:800;font-size:13px;letter-spacing:.08em}.hero-copy{max-width:820px;margin:24px auto 0;text-align:center}.hero-copy h1,.page-hero h1{color:var(--ink);font-size:clamp(28px,4vw,32px);line-height:1.25;margin:8px 0 14px}.hero-copy p,.page-lead{font-size:16px;margin:0;color:var(--text)}
.action-row{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:20px}.btn-primary{background:linear-gradient(135deg,var(--bright) 0%,var(--brand) 55%,var(--deep) 100%);color:#fff;border-color:transparent}.btn-secondary{background:#fff;color:var(--deep)}
.section{padding:34px 0}.section-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:18px}.section-head h2{margin:2px 0 0;color:var(--ink);font-size:24px;line-height:1.35}.section-head p{max-width:560px;margin:0;color:var(--muted)}
.step-level{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:12px}.step-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;box-shadow:var(--shadow);position:relative;overflow:hidden}.step-card:before{content:"";display:block;width:40px;height:5px;border-radius:2px;background:var(--bright);margin-bottom:14px}.step-level.second .step-card:before{background:var(--deep)}.step-card h3{margin:0 0 7px;color:var(--ink);font-size:17px}.step-card p{margin:0 0 12px;color:var(--muted);font-size:14px}.text-link{color:var(--brand);font-weight:800}
.feature-split{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:26px;align-items:center}.section-media{min-height:220px}.section-media img{width:100%;height:240px;object-fit:contain;object-position:center}.feature-copy h2{color:var(--ink);margin:0 0 10px;font-size:26px}.feature-copy p{margin:0 0 15px}.number-list{display:grid;gap:9px}.number-list a{display:grid;grid-template-columns:46px 1fr;gap:10px;align-items:center;padding:11px 12px;background:#fff;border:1px solid var(--line);border-radius:12px}.number-list b{color:var(--brand);font-size:13px}
.pebble-grid,.card-grid,.four-grid,.three-grid{display:grid;gap:16px}.pebble-grid,.four-grid{grid-template-columns:repeat(4,1fr)}.three-grid{grid-template-columns:repeat(3,1fr)}.card-grid{grid-template-columns:repeat(2,1fr)}
.pebble-card,.info-card,.article-card,.faq-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}.pebble-card .media{height:200px;background:var(--soft);display:flex;align-items:center;justify-content:center}.pebble-card img{width:100%;height:200px;object-fit:contain}.pebble-card .body,.info-card,.article-card{padding:18px}.pebble-card h3,.info-card h3,.article-card h2,.article-card h3{color:var(--ink);margin:0 0 8px}.pebble-card p,.info-card p,.article-card p{margin:0;color:var(--text)}
.album-list{display:grid;gap:12px}.album-row{display:grid;grid-template-columns:56px 1fr auto;gap:14px;align-items:center;padding:15px 16px;background:#fff;border:1px solid var(--line);border-radius:14px}.album-row span:first-child{color:var(--brand);font-weight:900}.album-row strong{color:var(--ink)}.album-row small{color:var(--muted)}
.gallery-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.gallery-tile{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden}.gallery-tile .fake-image{height:124px;background:linear-gradient(145deg,var(--pale),#fff);display:flex;align-items:center;justify-content:center;color:var(--deep);font-weight:800}.gallery-tile p{padding:13px;margin:0;font-size:14px}
.long-copy{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px;box-shadow:var(--shadow)}.long-copy h2,.long-copy h3{color:var(--ink);margin-top:0}.long-copy p{margin:0 0 14px}.long-copy p:last-child{margin-bottom:0}
.page-hero{width:min(920px,calc(100% - 32px));text-align:center}.page-hero .page-media{margin-top:20px;min-height:200px}.page-media img{width:100%;height:240px;object-fit:contain}.page-wrap{width:min(var(--max),calc(100% - 32px));margin:0 auto 40px}.content-index{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin:0 0 20px}.content-index a{background:var(--soft);border:1px solid var(--line);color:var(--deep);padding:12px;border-radius:12px;text-align:center;font-weight:700}
.prose-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.prose-section{background:#fff;border:1px solid var(--line);border-radius:16px;padding:21px;box-shadow:var(--shadow)}.prose-section h2{color:var(--ink);font-size:20px;margin:0 0 10px}.prose-section p{margin:0 0 12px}.prose-section p:last-child{margin-bottom:0}
.route-flow{display:grid;gap:18px}.route-entry{background:#fff;border-left:5px solid var(--brand);border-radius:0 16px 16px 0;padding:22px 24px;box-shadow:var(--shadow)}.route-entry h2{margin:0 0 9px;color:var(--ink)}
.notes-list{display:grid;gap:12px}.note-row{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;display:grid;grid-template-columns:90px 1fr;gap:18px}.note-row strong{color:var(--brand)}.note-row h2{margin:0 0 7px;color:var(--ink);font-size:20px}.note-row p{margin:0}
.window-layout{display:grid;grid-template-columns:1.05fr .95fr;gap:18px}.window-main,.window-aside{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px}.window-main h2,.window-aside h2{color:var(--ink);margin-top:0}
.chapters{counter-reset:chapter;display:grid;gap:15px}.chapter{counter-increment:chapter;background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;position:relative}.chapter:before{content:counter(chapter,decimal-leading-zero);position:absolute;right:18px;top:14px;color:var(--pale);font-size:40px;font-weight:900}.chapter h2{position:relative;color:var(--ink);margin:0 0 10px;max-width:78%}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;counter-reset:steps}.step{counter-increment:steps;background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px}.step:before{content:counter(steps,decimal-leading-zero);display:inline-flex;width:42px;height:42px;align-items:center;justify-content:center;border-radius:10px;background:var(--brand);color:#fff;font-weight:900;margin-bottom:12px}.step h2{color:var(--ink);margin:0 0 8px;font-size:20px}
.app-showcase{display:grid;grid-template-columns:.85fr 1.15fr;gap:28px;align-items:center}.app-visual{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px;display:flex;align-items:center;justify-content:center}.app-visual img{height:420px;width:100%;object-fit:contain}.app-copy h2{color:var(--ink)}.icon-badge{display:flex;align-items:center;gap:12px;margin-bottom:14px}.icon-badge img{width:64px;height:64px;object-fit:contain;border-radius:14px}.icon-badge strong{color:var(--ink);font-size:22px}
.faq-list{display:grid;gap:12px}.faq-card{padding:20px}.faq-card h2{font-size:18px;color:var(--ink);margin:0 0 8px}.faq-card p{margin:0}
.site-footer{background:var(--ink);color:#D4E8EC;margin-top:44px}.footer-inner{width:min(var(--max),calc(100% - 32px));margin:0 auto;padding:34px 0 86px}.footer-brand{display:flex;align-items:center;gap:14px;margin-bottom:24px}.footer-logo{height:34px;width:auto;max-width:210px;object-fit:contain;filter:brightness(0) invert(1)}.footer-brand strong{display:block;color:#fff;font-size:20px}.footer-brand span{display:block;font-size:12px;letter-spacing:.14em}.footer-groups{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.footer-groups h2{font-size:15px;color:#fff;margin:0 0 10px}.footer-groups a{display:block;color:#D4E8EC;font-size:14px;margin:7px 0}.footer-note{border-top:1px solid rgba(255,255,255,.16);padding-top:20px;margin-top:26px}.copyright{color:#AFCED4;font-size:13px}
.tide-drawer{position:fixed;z-index:100;top:0;right:0;width:min(410px,86vw);height:100dvh;background:var(--bg);box-shadow:-18px 0 50px rgba(14,58,70,.18);transform:translateX(104%);visibility:hidden;pointer-events:none;transition:transform .25s ease,visibility .25s ease;overflow:auto;padding:18px}.tide-drawer.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{display:flex;align-items:center;justify-content:space-between;gap:12px;position:sticky;top:-18px;background:var(--bg);padding:18px 0 12px;z-index:2}.drawer-brand{display:flex;align-items:center;gap:10px}.drawer-logo{height:30px;width:auto;max-width:155px;object-fit:contain}.drawer-brand strong,.drawer-brand small{display:block}.drawer-brand strong{color:var(--ink)}.drawer-brand small{font-size:11px;color:var(--muted)}.drawer-close,.search-close{min-height:44px;padding:0 14px;border-radius:10px;border:1px solid var(--line);background:#fff;color:var(--deep);font-weight:800}.wave-stack{display:grid;gap:12px}.wave-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px;box-shadow:var(--shadow)}.wave-card h2{color:var(--ink);font-size:16px;margin:0 0 8px}.drawer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.drawer-links a{padding:10px;border-radius:10px;background:var(--soft);min-width:0}.drawer-links strong{display:block;color:var(--deep);font-size:14px}.drawer-links span{display:block;color:var(--muted);font-size:11px;line-height:1.45;margin-top:4px}
.search-panel{position:fixed;z-index:95;left:0;right:0;top:82px;visibility:hidden;pointer-events:none;opacity:0;transform:translateY(-10px);transition:.2s ease}.search-panel.is-open{visibility:visible;pointer-events:auto;opacity:1;transform:translateY(0)}.search-card{width:min(760px,calc(100% - 32px));margin:12px auto;background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:0 24px 70px rgba(14,58,70,.18)}.search-head{display:flex;justify-content:space-between;gap:16px;align-items:start}.search-head h2{color:var(--ink);font-size:22px;margin:4px 0 12px}.search-appearance{display:grid;gap:7px;color:var(--muted);font-size:13px}.search-appearance input{width:100%;min-height:48px;border:1px solid var(--line);border-radius:12px;padding:0 14px;color:var(--ink);background:var(--bg)}.search-presets{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0}.search-presets a{min-height:44px;display:inline-flex;align-items:center;padding:0 14px;background:var(--soft);border-radius:10px;color:var(--deep);font-weight:800}.search-card p{margin:0;color:var(--muted);font-size:13px}.site-overlay{position:fixed;z-index:90;inset:0;background:rgba(8,38,45,.32);opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.site-overlay.is-open{opacity:1;visibility:visible;pointer-events:auto}.ui-locked{overflow:hidden}
.mobile-bottom{display:none}
:focus-visible{outline:3px solid rgba(43,179,196,.55);outline-offset:2px}
@media (hover:hover){a:hover{color:var(--brand)}.app-link:hover,.btn-primary:hover,.tabs-inner a.is-current:hover,.mobile-bottom a.is-current:hover{color:#fff;filter:brightness(1.04)}}
@media (max-width:900px){.step-level,.pebble-grid,.four-grid{grid-template-columns:repeat(2,1fr)}.three-grid{grid-template-columns:1fr}.feature-split,.app-showcase,.window-layout{grid-template-columns:1fr}.gallery-strip{grid-template-columns:repeat(2,1fr)}.content-index{grid-template-columns:repeat(3,1fr)}.steps{grid-template-columns:repeat(2,1fr)}.footer-groups{grid-template-columns:repeat(2,1fr)}}
@media (max-width:640px){
  .top-inner,.dock-inner,.tabs-inner,.container,.page-wrap,.footer-inner{width:calc(100% - 32px)}
  .site-main{padding-top:102px;padding-bottom:52px}.shell-tabs{display:none}.dock-inner{grid-template-columns:minmax(0,1fr) auto auto;gap:8px}.brand-logo{height:30px;max-width:138px}.brand-text{font-size:18px}.drawer-open,.app-link{min-height:44px;padding:0 11px;font-size:13px}.mist-brand{font-size:11px}
  .hero{margin-top:14px}.hero-media{min-height:180px}.hero-media img{height:min(260px,58vw)}.hero-copy{text-align:left}.hero-copy h1,.page-hero h1{font-size:28px}.action-row{justify-content:flex-start}
  .section{padding:28px 0}.section-head{display:block}.section-head p{margin-top:8px}.step-level,.pebble-grid,.four-grid,.card-grid,.prose-grid,.steps{grid-template-columns:1fr}.gallery-strip{grid-template-columns:1fr 1fr}.content-index{grid-template-columns:1fr 1fr}.feature-split{gap:18px}.section-media img,.page-media img{height:210px}.note-row{grid-template-columns:1fr;gap:6px}
  .album-row{grid-template-columns:46px 1fr}.album-row small{grid-column:2}.footer-groups{grid-template-columns:1fr 1fr;gap:18px 12px}.footer-inner{padding-bottom:92px}
  .search-panel{top:82px}.search-card{width:calc(100% - 20px);background:var(--pale);padding:16px}.search-head h2{font-size:19px}.drawer-links{grid-template-columns:1fr}
  .mobile-bottom{display:grid;grid-template-columns:repeat(5,1fr);position:fixed;z-index:70;left:0;right:0;bottom:0;min-height:50px;padding-bottom:env(safe-area-inset-bottom);background:#fff;border-top:1px solid var(--line);box-shadow:0 -8px 24px rgba(14,58,70,.08)}.mobile-bottom a{min-height:50px;display:flex;align-items:center;justify-content:center;font-size:13px;color:var(--deep);font-weight:800}.mobile-bottom a.is-current{background:var(--brand);color:#fff}
}
@media (max-width:390px){.brand-logo{max-width:112px}.brand-text{font-size:16px}.drawer-open,.app-link{padding:0 9px}.gallery-strip{grid-template-columns:1fr}.footer-groups{grid-template-columns:1fr}.content-index{grid-template-columns:1fr}}