:root{--ink:#10212b;--muted:#536a75;--border:#dce8e7;--surface:#fff;--wash:#f4faf9;--teal:#086b6d;--teal2:#0bc1bd;--coral:#ff665d;--navy:#061c27;--gold:#eabf65;--shadow:0 15px 45px rgba(8,48,50,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#f7fbfb;color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,'Segoe UI',sans-serif;line-height:1.68;font-size:16px}a{color:var(--teal);text-decoration:none}a:hover{text-decoration:underline}img{max-width:100%}.container{width:min(1240px,calc(100% - 42px));margin-inline:auto}.skip-link{position:absolute;left:-1000px}.skip-link:focus{left:12px;top:10px;z-index:1000;background:#fff;padding:10px}.topline{background:#082632;color:#b8e3df;font-size:12px;padding:6px 0}.topline .container{display:flex;justify-content:space-between;gap:20px}.header{background:rgba(255,255,255,.96);border-bottom:1px solid #e2eeed;position:sticky;top:0;z-index:60;backdrop-filter:blur(18px)}.nav-inner{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:18px}.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;color:var(--ink)!important;font-weight:900;letter-spacing:-.8px;font-size:25px}.brand-mark{display:grid;place-items:center;border-radius:12px;width:42px;height:42px;color:white;background:linear-gradient(145deg,#074b5d,#11c6b2);box-shadow:0 6px 18px #12acaa40;font-size:22px}.brand-name strong{color:#098d88}.brand-name small{display:block;font-size:10px;letter-spacing:1.8px;text-transform:uppercase;color:#78929a;line-height:1.1}.nav-list{display:flex;gap:17px;align-items:center}.nav-list>a{font-size:13px;font-weight:700;color:#304b55;white-space:nowrap}.nav-list>a[aria-current=page]{color:#078c84}.nav-cta,.cta{background:var(--coral);color:white!important;border:0;border-radius:13px;padding:11px 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120px);overflow:hidden;position:relative}.hero-art:before{content:'';position:absolute;inset:0 auto 0 0;width:28%;background:linear-gradient(90deg,#082f3c,transparent);z-index:1}.hero-art img{height:100%;width:100%;object-fit:cover;object-position:65% center;position:absolute;inset:0}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}.ghost-btn{background:#ffffff14;border:1px solid #66d0d0a8;color:white!important;padding:10px 18px;border-radius:13px;font-weight:750}.proof-pills{display:flex;flex-wrap:wrap;gap:10px;margin-top:25px}.proof-pills span{border:1px solid #8fe7da55;border-radius:99px;padding:6px 11px;color:#c5eae7;font-size:12px}.breadcrumbs{font-size:13px;color:#72858f;padding-top:24px;padding-bottom:8px}.breadcrumbs a{color:#537985}.breadcrumb-arrow{margin:0 9px}.section{padding:58px 0;border-bottom:1px solid #e1eded}.section:nth-of-type(even){background:#eff7f6}.section-title{font-size:clamp(27px,3vw,39px);line-height:1.2;letter-spacing:-.9px;margin:0 0 22px;color:#082c34}.section-title:before{content:'';display:block;width:45px;height:5px;border-radius:10px;background:var(--coral);margin-bottom:15px}.section-body{max-width:100%}.section-body>p{max-width:1000px;color:#364f5b}.section-body>p:first-child{font-size:17px}.toc{background:white;border:1px solid var(--border);border-radius:19px;padding:24px 28px;margin:20px auto 16px;box-shadow:var(--shadow)}.toc h2{margin:0 0 14px;font-size:18px}.toc-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:7px 23px}.toc-grid a{color:#35646a;font-size:14px;padding:4px 0}.toc-grid a:before{content:'↗';color:#ed786b;margin-right:8px}.tile-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.tile{background:#fff;border:1px solid #dce9e8;box-shadow:0 7px 20px #0759540b;border-radius:19px;padding:26px;display:block;color:#173c46;transition:transform .15s,box-shadow .15s}.tile:hover{transform:translateY(-3px);box-shadow:var(--shadow);text-decoration:none}.tile-top{display:inline-grid;place-items:center;width:48px;height:48px;border-radius:12px;background:#def7f2;color:#067d78;font-size:20px;font-weight:900}.tile h3{margin:14px 0 5px;line-height:1.3;font-size:19px}.tile p{font-size:14px;color:#60727a}.tile-arrow{font-size:12px;color:#dd6059;font-weight:800}.table-wrap{overflow-x:auto;background:#fff;border:1px solid var(--border);border-radius:16px;box-shadow:0 7px 20px #0b4f5808}table{border-collapse:collapse;width:100%;min-width:620px;font-size:14px}th,td{border-bottom:1px solid #e6efed;padding:15px 19px;text-align:left;vertical-align:top}th{background:#0c4850;color:white;font-weight:800}tbody tr:last-child td{border-bottom:0}tbody tr:nth-child(even) td{background:#f4faf9}.check-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px;list-style:none;margin:0;padding:0}.check-list li{background:#fff;padding:17px 18px 17px 42px;border:1px solid var(--border);border-radius:12px;position:relative}.check-list li:before{content:'✓';position:absolute;left:15px;color:#0c9d8d;font-weight:900}.step-list{list-style:none;padding:0;counter-reset:steps;display:grid;gap:13px}.step-list li{padding:17px 18px 17px 62px;position:relative;background:#fff;border:1px solid var(--border);border-radius:13px;counter-increment:steps}.step-list li:before{content:counter(steps,decimal-leading-zero);position:absolute;left:14px;top:14px;color:#098b87;font-size:18px;font-weight:900}.notice{border-left:5px solid #ee786d;background:#fff9f4;padding:19px 22px;border-radius:0 12px 12px 0;color:#714a3d;margin:21px 0}.faq details{background:#fff;border:1px solid var(--border);padding:18px 22px;margin:10px 0;border-radius:12px}.faq summary{cursor:pointer;font-weight:800}.faq details p{margin-bottom:0;color:#506670}.related{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.related a{padding:15px 17px;border:1px solid var(--border);background:white;border-radius:12px;font-weight:700}.banner-mini{background:#0b3b43;border-radius:20px;padding:26px;color:white;display:flex;align-items:center;justify-content:space-between;gap:20px;margin:25px 0}.banner-mini p{margin:0;color:#bce6e0}.footer{background:#081c27;color:#b5ced1;padding:56px 0 20px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:25px}.footer a{color:#d7f6f3}.footer h3{color:#fff;font-size:15px}.footer li{margin:9px 0}.footer ul{list-style:none;padding:0}.footer p{font-size:13px}.footer-bottom{border-top:1px solid #37545c;margin-top:32px;padding-top:16px;font-size:12px}.pagehero{background:linear-gradient(120deg,#093541,#0b5559);color:#fff;padding:55px 0 60px}.pagehero h1{font-size:clamp(36px,4vw,58px);line-height:1.1;max-width:980px;margin:7px 0 14px;letter-spacing:-1.5px}.pagehero p{font-size:18px;color:#d1edeb;max-width:950px}.call-to-action-band{background:#093640;color:#fff;padding:50px 0}.call-to-action-band .container{display:flex;align-items:center;justify-content:space-between;gap:22px}.call-to-action-band h2{margin:0;font-size:26px}.call-to-action-band p{color:#b5dedb;margin:5px 0}.site-note{font-size:12px;color:#68838b}.reading-time{color:#6c8888;font-size:12px;font-weight:700}.section-quicknav{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}.section-quicknav a{background:#e3f6f3;border-radius:40px;padding:7px 13px;font-size:13px}.badge-promo{display:inline-block;border-radius:100px;color:#9d372c;background:#ffeae6;padding:5px 12px;font-weight:800;font-size:12px}.screen-note{margin-bottom:0;font-size:12px;color:#a7ced0}@media(max-width:1100px){.nav-list{gap:10px}.nav-list>a{font-size:11px}.hero-inner{min-height:450px}}@media(max-width:850px){.menu-button{display:block}.nav-list{display:none;position:absolute;top:76px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;padding:20px;border-bottom:1px solid var(--border);box-shadow:var(--shadow)}.nav-list.open{display:flex}.nav-list>a{font-size:15px}.hero-inner{grid-template-columns:1fr;min-height:auto}.hero-art{position:absolute;inset:0;width:100%;opacity:.22}.hero-art:before{width:100%;background:#082f3cad}.hero-copy{padding:60px 0 70px}.tile-grid{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:repeat(2,1fr)}.toc-grid{grid-template-columns:repeat(2,1fr)}.call-to-action-band .container{display:block}.call-to-action-band .cta{margin-top:20px}}@media(max-width:560px){.container{width:calc(100% - 28px)}.topline span:last-child{display:none}.hero h1{font-size:42px;letter-spacing:-1.3px}.hero .lead{font-size:16px}.section{padding:37px 0}.tile-grid,.check-list,.related,.toc-grid,.footer-grid{grid-template-columns:1fr}.nav-inner{min-height:68px}.nav-list{top:68px}.brand{font-size:21px}.brand-mark{width:35px;height:35px}.pagehero{padding:36px 0}.pagehero p{font-size:16px}.toc{padding:20px}.hero-actions{flex-direction:column;align-items:stretch}.hero-actions a{text-align:center}}

/* DSSCHOOL V2 - consistent CTA and compact floating APK guide */
.nav-list .nav-register{display:inline-flex;align-items:center;justify-content:center;white-space:nowrap;background:#ff6455;color:#fff!important;font-size:12px;font-weight:800;border-radius:999px;padding:10px 13px;box-shadow:0 3px 12px #fc5e4b33;text-decoration:none;transition:transform .18s ease}
.nav-list .nav-register:hover{transform:translateY(-2px);background:#ef5144}
.floating-apk{position:fixed;right:20px;bottom:18px;z-index:90;display:inline-flex;align-items:center;gap:7px;padding:10px 15px;border-radius:999px;background:#0d6d6c;color:white!important;border:1px solid #62d5cb;box-shadow:0 7px 25px #031e25a8;font-size:13px;font-weight:800;text-decoration:none;transition:transform .18s ease, background .18s ease}
.floating-apk:hover{transform:translateY(-3px);background:#085454}
.floating-apk span:first-child{display:grid;place-items:center;width:22px;height:22px;border-radius:50%;background:#ffffff2a;font-size:17px}
body{padding-bottom:72px}
@media(max-width:1100px){.nav-list .nav-register{font-size:11px;padding:9px 11px}}
@media(max-width:850px){.nav-list .nav-register{font-size:14px;padding:12px 16px;align-self:stretch}}
@media(max-width:560px){.floating-apk{bottom:calc(12px + env(safe-area-inset-bottom, 0px));right:12px;padding:9px 12px;font-size:12px;gap:6px;box-shadow:0 6px 16px #031e2580}.floating-apk span:first-child{width:19px;height:19px;font-size:14px}body{padding-bottom:74px}}
@media(prefers-reduced-motion:reduce){.floating-apk,.nav-list .nav-register{transition:none}}

/* DSSCHOOL V3: compact full-width bottom app bar based on user's mobile reference */
.floating-apk{display:none!important}
.app-sticky-bar{position:fixed;left:0;right:0;bottom:0;z-index:100;background:#fff;color:#1e292a;border-top:1px solid #dce8e4;box-shadow:0 -7px 35px rgba(2,35,38,.17);padding:9px max(16px,env(safe-area-inset-right)) calc(9px + env(safe-area-inset-bottom,0px)) max(16px,env(safe-area-inset-left))}
.app-sticky-inner{max-width:1240px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:14px;min-height:54px}
.app-sticky-brand{display:flex;gap:10px;align-items:center;min-width:0;color:#202b31!important;text-decoration:none!important}
.app-sticky-mark{width:46px;height:46px;flex-shrink:0;border-radius:12px;background:linear-gradient(135deg,#05575e,#11c5b7);color:#fff;font-weight:900;letter-spacing:-1px;display:grid;place-items:center;font-size:18px}
.app-sticky-title{display:flex;flex-direction:column;line-height:1.25;min-width:0}.app-sticky-title strong{font-size:16px;letter-spacing:-.3px}.app-sticky-title small{font-size:11px;color:#62777b;white-space:nowrap}
.app-sticky-actions{display:flex;gap:9px;align-items:center;justify-content:flex-end;min-width:0}
.app-sticky-actions a{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:12px 18px;font-size:14px;font-weight:850;border-radius:11px;text-decoration:none!important;white-space:nowrap;min-height:46px}
.app-sticky-register{background:#ff685d;color:#fff!important}.app-sticky-register:hover{background:#e95247}
.app-sticky-download{background:#397c52;color:#fff!important;box-shadow:0 6px 15px rgba(32,103,68,.2)}.app-sticky-download:hover{background:#2c6844}
body{padding-bottom:95px}
@media(max-width:640px){.app-sticky-bar{padding:7px 10px calc(7px + env(safe-area-inset-bottom,0px))}.app-sticky-inner{min-height:49px;gap:8px}.app-sticky-mark{height:37px;width:37px;border-radius:9px;font-size:15px}.app-sticky-brand{gap:6px}.app-sticky-title strong{font-size:12px}.app-sticky-title small{display:none}.app-sticky-actions{gap:6px;flex:1}.app-sticky-actions a{padding:9px 9px;min-height:40px;border-radius:9px;font-size:12px;flex:1}.app-sticky-register span{display:none}.app-sticky-download svg{height:14px;width:14px;flex-shrink:0}body{padding-bottom:calc(80px + env(safe-area-inset-bottom,0px))}}
@media(max-width:375px){.app-sticky-brand{display:none}.app-sticky-actions{width:100%}.app-sticky-actions a{font-size:12px}}
@media(prefers-reduced-motion:reduce){.app-sticky-bar *{transition:none!important}}