:root{--bg:#F4FAFC;--paper:#fff;--wash:#E7F3F6;--ink:#0E3A46;--text:#24505A;--muted:#4A7380;--subtle:#7A9AA4;--sea:#1A7F8F;--bright:#2BB3C4;--deep:#0F5B68;--pale:#D7EEF2;--line:rgba(26,127,143,.16);--shadow:0 14px 34px rgba(14,58,70,.08);--radius:16px;--top:134px;font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;color-scheme:light}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:160px}body{margin:0;min-width:0;background:var(--bg);color:var(--text);font-size:16px;line-height:1.8;overflow-x:clip;padding-top:var(--top)}body.panel-lock{overflow:hidden}h1,h2,h3,h4,p,figure{margin-top:0}h1,h2,h3{color:var(--ink);letter-spacing:-.025em;line-height:1.4}h1{font-size:clamp(28px,3.5vw,36px);font-weight:750}h2{font-size:clamp(21px,2.6vw,29px);font-weight:720}h3{font-size:19px}p{margin-bottom:1.2em}a{color:var(--deep);text-decoration:none}a:hover{color:var(--sea)}button,input{font:inherit}button{cursor:pointer}button,a,input{outline-offset:3px}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--bright);outline-offset:4px}img{max-width:100%;height:auto}svg{display:block}ul,ol{padding-left:1.25em}.shell{width:min(1180px,calc(100% - 44px));margin-inline:auto}.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}[hidden]{display:none!important}
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.main-content{padding-top:32px;padding-bottom:96px;min-height:58vh}.section{margin:0 0 62px}.eyebrow{display:inline-block;color:var(--sea);letter-spacing:.20em;font-size:11px;font-weight:850;text-transform:uppercase}.section-heading{margin-bottom:22px;display:flex;align-items:end;justify-content:space-between;gap:16px;flex-wrap:wrap}.section-heading h2{margin:7px 0 0}.section-heading .small-link{font-weight:730;font-size:14px}.section-heading .small-link:hover{text-decoration:underline}.lede{font-size:17px;color:var(--muted);max-width:860px}.kicker{font-size:12px;letter-spacing:.16em;font-weight:800;color:var(--sea);text-transform:uppercase}.btn-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.btn,.soft-btn{min-height:44px;display:inline-flex;align-items:center;justify-content:center;border-radius:10px;font-weight:730;padding:9px 17px;white-space:nowrap;font-size:14px}.btn{background:linear-gradient(135deg,#2BB3C4 0%,#1A7F8F 55%,#0F5B68 100%);color:#fff}.btn:hover{color:#fff;filter:brightness(.92)}.soft-btn{background:#fff;color:var(--deep);border:1px solid rgba(26,127,143,.25)}.soft-btn:hover{background:var(--wash);color:var(--deep)}.text-arrow{display:inline-flex;align-items:center;gap:8px;font-weight:770;font-size:14px;min-height:44px}.text-arrow:after{content:'↗';font-size:17px}.text-arrow:hover{text-decoration:underline}.rule-line{border:0;border-top:1px solid var(--line);margin:22px 0}
.media-slot{position:relative;overflow:hidden;border-radius:16px;background:linear-gradient(130deg,#E1F3F6 0%,#D7EEF2 48%,#F8FBFC 100%);display:grid;place-items:center;isolation:isolate;min-width:0}.media-slot img{width:100%;height:100%;object-fit:contain;object-position:center;display:block}.media-wide{height:300px}.media-banner{height:320px}.media-landscape{height:200px}.media-portrait{height:320px}.media-square{height:205px}.media-app{height:420px}.media-fallback{isolation:isolate;display:flex;flex-direction:column;align-items:flex-start;justify-content:center;text-align:left;gap:6px;padding:24px;min-height:100%;width:100%;position:relative;color:var(--ink);overflow:hidden}.media-fallback:before{content:'';position:absolute;width:80%;aspect-ratio:1;border:1px solid rgba(26,127,143,.12);border-radius:50%;top:26%;right:-24%;z-index:-1;box-shadow:0 0 0 28px rgba(26,127,143,.04),0 0 0 62px rgba(26,127,143,.04),0 0 0 102px rgba(26,127,143,.03)}.media-fallback:after{content:'';position:absolute;width:100%;height:36%;bottom:-18%;left:-8%;border-radius:50% 40% 0 0;background:rgba(26,127,143,.07);z-index:-1;transform:rotate(-7deg)}.media-fallback strong{font-size:clamp(18px,2.8vw,28px);font-weight:800;line-height:1.35;max-width:17em}.media-fallback span:not(.fallback-mark){font-size:13px;max-width:34em;color:var(--muted)}.fallback-mark{color:var(--sea);font-size:40px;font-weight:200;line-height:1}
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.page-mask{position:fixed;inset:0;background:rgba(5,35,42,.43);z-index:109;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.page-mask.is-open{opacity:1;visibility:visible;pointer-events:auto}.tide-menu{position:fixed;z-index:120;left:0;top:90px;bottom:0;width:min(360px,86vw);background:#fff;box-shadow:12px 6px 36px rgba(14,58,70,.15);overflow-y:auto;overscroll-behavior:contain;transform:translateX(-105%);visibility:hidden;pointer-events:none;transition:transform .24s,visibility .24s;padding:19px 21px 25px}.tide-menu.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}.panel-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-bottom:12px;border-bottom:1px solid var(--line)}.panel-brand{display:block;color:var(--ink)}.panel-brand .brand-word{font-size:22px}.panel-brand .brand-logo{max-height:30px}.icon-close{width:44px;height:44px;display:grid;place-items:center;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--deep);font-size:26px;line-height:1}.icon-close:hover{background:var(--wash)}.panel-intro{font-size:13px;color:var(--muted);margin:13px 0 18px}.panel-group{border-top:1px solid var(--line);padding:12px 0}.panel-group h2{font-size:14px;color:var(--sea);letter-spacing:.10em;margin:0 0 5px}.panel-item{padding:9px 11px;display:block;border-radius:9px;margin:0 0 2px}.panel-item b{display:block;font-size:14px;color:var(--ink)}.panel-item small{font-size:12px;color:var(--muted);line-height:1.65;display:block}.panel-item:hover,.panel-item.is-active{background:var(--wash)}
.search-panel{position:fixed;z-index:121;top:90px;right:max(22px,calc((100vw - 1180px)/2));width:min(550px,calc(100vw - 44px));max-height:calc(100dvh - 110px);overflow:auto;background:#fff;border:1px solid var(--line);border-radius:0 0 18px 18px;box-shadow:0 20px 48px rgba(14,58,70,.17);padding:26px;opacity:0;visibility:hidden;pointer-events:none;transform:translateY(-9px);transition:opacity .18s,transform .18s,visibility .18s}.search-panel.is-open{opacity:1;visibility:visible;pointer-events:auto;transform:translateY(0)}.search-top{display:flex;align-items:flex-start;justify-content:space-between;gap:20px}.search-top h2{margin:2px 0 23px;font-size:24px}.search-label{display:block;font-size:13px;color:var(--sea);font-weight:750;margin-bottom:9px}.search-panel input{width:100%;padding:12px 15px;min-height:48px;border:1px solid rgba(26,127,143,.32);background:var(--bg);border-radius:10px;color:var(--ink)}.search-panel input::placeholder{color:#5A8089}.search-tip{font-size:12px;color:var(--muted);margin:12px 0 16px}.search-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.search-options a{min-height:46px;display:flex;justify-content:space-between;align-items:center;border:1px solid var(--line);background:var(--wash);border-radius:9px;padding:8px 13px;font-size:14px;font-weight:740}.search-options a span{color:var(--sea)}.search-empty{font-size:14px;color:var(--muted)}
@media(max-width:1100px){.shell{width:min(100% - 38px,1060px)}.four-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.brand-en{display:none}.search-panel{right:19px}.page-intro{grid-template-columns:1fr 220px}.page-chapters{grid-template-columns:minmax(0,1fr) 235px}}
@media(max-width:800px){:root{--top:90px}.shore-nav{display:none}.tag-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.longboard-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.longboard:last-child{grid-column:span 2}.four-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.rail-list{grid-template-columns:repeat(2,minmax(0,1fr))}.page-intro{grid-template-columns:1fr}.page-intro .media-slot{height:200px}.page-chapters{grid-template-columns:1fr}.sidebar-note{position:static;order:2}.footer-lead{grid-template-columns:1fr}.mobile-bottom{position:fixed;bottom:0;left:0;right:0;z-index:70;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:2px;padding:4px 8px calc(4px + env(safe-area-inset-bottom));background:#fff;border-top:1px solid var(--line);box-shadow:0 -2px 12px rgba(14,58,70,.06)}.mobile-link{min-height:50px;border-radius:9px;display:flex;flex-direction:column;gap:0;align-items:center;justify-content:center;text-align:center;color:var(--muted);font-size:11px;font-weight:720;white-space:nowrap}.mobile-link .bottom-symbol{font-size:19px;line-height:23px}.mobile-link.is-active{background:var(--sea);color:#fff}.mobile-link:hover{background:var(--wash)}.mobile-link.is-active:hover{background:var(--deep);color:#fff}.main-content{padding-bottom:104px}.footer-inner{padding-bottom:calc(90px + env(safe-area-inset-bottom))}.search-panel{right:0;left:0;top:90px;width:100%;max-height:calc(100dvh - 90px);border-radius:0;min-height:calc(100dvh - 90px);background:var(--wash);padding:23px 20px}.search-panel .search-options a{background:#fff}.tide-menu{width:86vw}.home-cover-copy{grid-template-columns:1fr}.home-cover-actions{justify-content:flex-start}}
@media(max-width:520px){.shell{width:calc(100% - 32px)}.lighthouse-inner{gap:8px;justify-content:space-between}.brand{max-width:49%;min-width:0;gap:6px}.brand-word{font-size:21px}.brand-logo{max-height:33px;max-width:155px}.menu-toggle{margin-left:auto;font-size:13px;padding:0 10px;gap:6px;min-height:44px}.menu-bars{width:17px}.app-entry{margin-left:0;padding:8px 11px;font-size:12px;min-height:44px}.main-content{padding-top:24px}.section{margin-bottom:47px}.home-cover .media-banner{height:min(55vw,235px)}.home-cover-copy h1{font-size:29px}.media-fallback{padding:17px}.media-fallback strong{font-size:20px}.media-fallback span:not(.fallback-mark){font-size:12px}.tag-grid{grid-template-columns:1fr;gap:9px}.tag-tile{padding:13px}.tag-symbol{flex-basis:40px;width:40px;height:40px}.current-feature{grid-template-columns:1fr;padding:17px;gap:16px}.current-feature .media-slot{height:185px}.numbered-links{grid-template-columns:1fr}.longboard-grid{grid-template-columns:1fr}.longboard:last-child{grid-column:auto}.longboard .media-slot{height:185px}.longboard-body{padding:18px}.feature-split,.feature-split.reverse{grid-template-columns:1fr;padding:17px}.feature-split.reverse .feature-media{order:0}.feature-split .media-slot{height:195px}.four-grid{grid-template-columns:1fr 1fr;gap:9px}.info-card{padding:15px}.info-card h3{font-size:16px}.info-card p{font-size:13px}.short-grid{grid-template-columns:1fr}.rail-list{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.rail-card .media-slot{height:120px}.rail-card div.rail-copy{padding:13px}.rail-card h3{font-size:16px}.rail-card p{font-size:12px}.app-feature{grid-template-columns:1fr;padding:18px}.app-feature .media-slot{height:310px}.simple-cols{grid-template-columns:1fr}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-bottom{flex-direction:column;align-items:flex-start}.footer-bottom span{white-space:normal}.page-intro{padding:21px 18px}.page-intro .media-slot{height:185px}.page-intro h1{font-size:30px}.chapter{padding:20px 18px}.chapter h2{font-size:20px}.chapter p{font-size:15px}.interest-layout{grid-template-columns:1fr}.interest-layout .chapter:first-child,.interest-layout .chapter:last-child{grid-column:auto}.photo-layout .chapter{grid-template-columns:1fr;gap:8px}.photo-layout .chapter .chapter-idx{font-size:24px}.frames-layout{grid-template-columns:1fr}.frames-layout .chapter .media-slot{height:150px}.steps-layout .chapter{padding-left:63px}.steps-layout .chapter:before{left:16px;font-size:20px}.page-closing{padding:22px 18px}.terms-layout{padding:0 17px}.deep-band{padding:20px}.faq-entry{padding:18px}.search-options{grid-template-columns:1fr 1fr}.tide-menu{padding:13px 17px 22px}.panel-item{padding:9px 8px}}
@media(max-width:359px){.brand-word{font-size:19px}.brand{max-width:45%}.brand-logo{max-width:130px}.menu-toggle{padding:0 8px;gap:4px}.app-entry{padding:8px 9px}.four-grid{grid-template-columns:1fr}.home-cover-copy h1{font-size:28px}.tide-line{font-size:9px}.short-card{padding:16px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
/* Editorial artwork when a supplied image is not yet present. */
.intro-mark{width:100%;height:205px;min-height:165px;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:7px;border-radius:14px;background:radial-gradient(circle at 75% 20%,rgba(43,179,196,.20),transparent 44%),linear-gradient(140deg,#D7EEF2,#F4FAFC);border:1px solid var(--line);color:var(--deep);letter-spacing:.25em;text-align:center}.intro-mark span{font-size:35px;font-weight:850;line-height:1.25}.intro-mark small{font-size:10px;letter-spacing:.30em;font-weight:750}.frame-etch{height:132px;border-radius:10px;margin-bottom:15px;background:linear-gradient(155deg,#c5e8ed,#f0f9fa 62%);position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center;color:var(--sea);font-size:34px;letter-spacing:.17em;font-weight:790}.frame-etch:before{content:'';position:absolute;width:110%;height:90%;left:10%;top:54%;border:1px solid rgba(26,127,143,.3);border-radius:50%;transform:rotate(-14deg)}.frame-etch i{position:absolute;bottom:-24px;right:-12px;width:50%;aspect-ratio:1;border:1px solid rgba(26,127,143,.27);border-radius:50%}.page-intro-app{grid-template-columns:minmax(0,1fr) 270px}.page-intro-app .media-slot{height:265px}.page-intro .intro-text>.info-kpis>span{max-width:100%}.page-intro .info-kpis>span:nth-child(2){background:var(--paper);font-weight:500}.sidebar-note .eyebrow{color:#BDECF0}
@media(max-width:800px){.page-intro-app{grid-template-columns:1fr}.page-intro-app .media-slot{height:260px}.intro-mark{height:175px}}
@media(max-width:520px){.intro-mark{height:145px}.intro-mark span{font-size:27px}.page-intro-app .media-slot{height:240px}}