:root{--bg:#f6f7f9;--surface:#fff;--line:#e3e7ee;--text:#1d2430;--muted:#687386;--blue:#2563eb;--green:#35a852;--orange:#f57c00;--danger:#c62828}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,Segoe UI,Arial,sans-serif}a{color:inherit;text-decoration:none}button,input,select{font:inherit}.topbar{position:-webkit-sticky;position:sticky;top:0;z-index:5;display:flex;align-items:center;justify-content:space-between;min-height:64px;padding:0 28px;background:hsla(0,0%,100%,.92);border-bottom:1px solid var(--line);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.brand{font-weight:800;font-size:20px}.topnav{display:flex;gap:18px;align-items:center;color:var(--muted)}.auth-pill{display:inline-flex;align-items:center;justify-content:center;min-height:34px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--text);padding:7px 12px;cursor:pointer;font-weight:800}.auth-pill.signed{color:var(--blue)}.auth-pill.muted{color:var(--muted)}.landing{overflow:hidden}.landing-hero{position:relative;min-height:calc(100vh - 64px);display:grid;align-items:center;padding:84px max(28px,calc((100vw - 1180px) / 2)) 120px;background:radial-gradient(circle at 72% 42%,rgba(37,99,235,.14),transparent 30%),linear-gradient(135deg,#f8fbff,#eef3f9)}.hero-content{position:relative;z-index:2;width:min(760px,100%)}.hero-content h1{font-size:clamp(42px,6vw,82px);max-width:920px}.hero-content p{max-width:680px;font-size:20px;line-height:1.55}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.secondary-link{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:8px;background:hsla(0,0%,100%,.72);color:var(--text);padding:12px 16px;font-weight:800}.hero-cube-scene{position:absolute;inset:0;perspective:1200px;pointer-events:none}.hero-cube{position:absolute;right:max(40px,calc((100vw - 1180px) / 2));top:22%;width:310px;height:310px;transform-style:preserve-3d;transform:rotateX(-22deg) rotateY(-34deg);animation:heroCubeFloat 7s ease-in-out infinite}.hero-cube span{position:absolute;inset:0;display:grid;place-items:center;border:1px solid rgba(31,41,55,.14);background:hsla(0,0%,100%,.86);color:#172033;font-size:42px;font-weight:900;box-shadow:0 28px 80px rgba(31,41,55,.12)}.hero-cube span:first-child{transform:translateZ(155px);background:#dbeafe}.hero-cube span:nth-child(2){transform:rotateY(90deg) translateZ(155px);background:#fef3c7}.hero-cube span:nth-child(3){transform:rotateX(90deg) translateZ(155px);background:#dcfce7}@keyframes heroCubeFloat{0%,to{transform:rotateX(-22deg) rotateY(-34deg) translateY(0)}50%{transform:rotateX(-18deg) rotateY(-48deg) translateY(-18px)}}.final-cta,.landing-section,.lesson-band{width:min(1180px,calc(100vw - 40px));margin:72px auto}.final-cta h2,.landing-section h2,.lesson-band h2{margin-bottom:18px;max-width:820px;font-size:clamp(30px,4vw,48px);line-height:1.08}.audience-grid,.feature-grid,.steps-grid{display:grid;grid-gap:14px;gap:14px;margin-top:24px}.audience-grid,.feature-grid,.steps-grid{grid-template-columns:repeat(4,1fr)}.audience-item,.feature-card,.step-item{background:var(--surface);border:1px solid var(--line);border-radius:10px;box-shadow:0 10px 28px rgba(20,30,50,.06)}.audience-item{padding:18px;font-weight:800}.feature-card{padding:20px}.feature-card h3{margin-bottom:10px}.lesson-band{display:grid;grid-template-columns:1fr 360px;grid-gap:36px;gap:36px;align-items:center;padding:42px;border-radius:10px;background:#172033;color:#fff}.lesson-band p{color:hsla(0,0%,100%,.74)}.lesson-band .eyebrow{color:#93c5fd}.phone-mock{display:grid;place-items:center;min-height:420px;border-radius:32px;background:linear-gradient(180deg,#fff,#edf2f8);border:8px solid #0f172a;box-shadow:0 28px 90px rgba(0,0,0,.28)}.phone-cube{display:grid;width:210px;height:210px;place-items:center;border-radius:8px;background:#dbeafe;color:#172033;font-weight:900;text-align:center;box-shadow:18px 18px 0 #fef3c7}.step-item{display:grid;grid-gap:18px;gap:18px;padding:18px}.step-item b{display:grid;width:34px;height:34px;place-items:center;border-radius:50%;background:var(--blue);color:#fff}.step-item span{font-weight:800}.final-cta{padding:42px;border-radius:10px;background:var(--surface);border:1px solid var(--line);box-shadow:0 10px 28px rgba(20,30,50,.06)}.page-shell{width:min(1180px,calc(100vw - 40px));margin:32px auto 56px}.auth-page{width:min(1040px,calc(100vw - 40px));min-height:calc(100vh - 64px);margin:0 auto;display:grid;grid-template-columns:1fr 420px;grid-gap:42px;gap:42px;align-items:center;padding:54px 0}.auth-page.single{grid-template-columns:minmax(0,620px);justify-content:center}.auth-copy h1{max-width:680px;font-size:clamp(34px,5vw,58px)}.auth-copy p{max-width:620px;font-size:18px;line-height:1.55}.auth-card,.notice-card{background:var(--surface);border:1px solid var(--line);border-radius:10px;box-shadow:0 10px 28px rgba(20,30,50,.06)}.auth-card{display:grid;grid-gap:16px;gap:16px;padding:22px}.auth-status-card{text-align:center;justify-items:center}.auth-status-card h1{font-size:clamp(26px,4vw,42px)}.auth-card label{display:grid;grid-gap:7px;gap:7px;color:var(--muted);font-weight:700}.auth-card input{width:100%;border:1px solid var(--line);border-radius:8px;background:#fbfcfe;color:var(--text);padding:12px}.segmented-control{display:grid;grid-template-columns:1fr 1fr;grid-gap:4px;gap:4px;padding:4px;border:1px solid var(--line);border-radius:9px;background:#f2f5f9}.segmented-control button{border:none;border-radius:7px;background:transparent;color:var(--muted);padding:10px;cursor:pointer;font-weight:800}.segmented-control button.active{background:#fff;color:var(--blue);box-shadow:0 4px 14px rgba(20,30,50,.08)}.form-message{margin:0;color:var(--danger);font-size:14px}.form-message.success{color:#1f7a3f}.editor-save-status{margin:0 0 14px;padding:12px 14px;border:1px solid #f2b8b5;border-radius:8px;background:#fff5f5;color:var(--danger)}.editor-save-status.success{border-color:#b8e2c3;background:#f0fff4;color:#1f7a3f}.notice-card{margin-bottom:20px;padding:14px 16px;color:var(--muted)}.notice-card a{color:var(--blue);font-weight:800}.notice-card.success{border-color:#b8e2c3;background:#f0fff4;color:#245f35}.profile-setup{display:grid;grid-template-columns:minmax(0,1fr) minmax(320px,520px);grid-gap:24px;gap:24px;align-items:start;margin-bottom:22px;padding:22px;background:var(--surface);border:1px solid var(--line);border-radius:10px;box-shadow:0 10px 28px rgba(20,30,50,.06)}.profile-form{display:grid;grid-gap:12px;gap:12px}.profile-form label{display:grid;grid-gap:6px;gap:6px;color:var(--muted);font-weight:700}.profile-form input,.profile-form textarea{width:100%;border:1px solid var(--line);border-radius:8px;background:#fbfcfe;color:var(--text);padding:10px 12px;resize:vertical}.profile-url{margin:0;font-size:14px}.profile-url a{color:var(--blue);font-weight:800}.admin-badge{display:inline-flex;align-items:center;min-height:30px;border-radius:999px;background:#172033;color:#fff;padding:6px 12px;font-size:13px;font-weight:800}.page-shell.wide{width:min(1380px,calc(100vw - 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24px));margin:12px auto 20px}.constructor-head{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:10px}.constructor-head h1{margin-bottom:0;font-size:30px}.constructor-save-panel{display:grid;grid-template-columns:minmax(220px,1fr) 160px 1.4fr;grid-gap:12px;gap:12px;align-items:end;margin-bottom:14px;padding:16px;background:var(--surface);border:1px solid var(--line);border-radius:10px;box-shadow:0 10px 28px rgba(20,30,50,.06)}.constructor-save-panel label{display:grid;grid-gap:6px;gap:6px;color:var(--muted);font-weight:700}.constructor-save-panel input,.constructor-save-panel textarea{width:100%;border:1px solid var(--line);border-radius:8px;background:#fbfcfe;color:var(--text);padding:10px 12px;resize:vertical}.constructor-save-panel .wide{grid-column:span 1}.constructor-save-panel .check-row{display:flex;gap:8px;align-items:center;min-height:42px}.constructor-save-panel .check-row input{width:auto}.constructor-frame{display:block;width:100%;height:calc(100vh - 150px);min-height:600px;border:1px solid var(--line);border-radius:10px;background:#fff;box-shadow:0 10px 28px rgba(20,30,50,.06)}.editor-sidebar{display:grid;grid-gap:12px;gap:12px;align-content:start}.upload-row{display:grid;grid-gap:8px;gap:8px;margin-top:8px}.check-row{display:flex;gap:8px;align-items:center;margin-top:10px}.action-stack{display:grid;grid-gap:8px;gap:8px}.action-stack button:first-child{background:var(--green)}.action-stack button:nth-child(3){background:var(--orange)}.report-row{grid-template-columns:1fr auto}.admin-actions{display:flex;gap:8px}.admin-actions button{border:1px solid var(--line);border-radius:7px;background:#fff;padding:9px 10px;cursor:pointer}.admin-actions .danger{border-color:#f2b8b5;color:var(--danger)}@media (max-width:900px){.cube-page,.editor-grid,.gallery-layout{grid-template-columns:1fr}.cube-info{order:2}.lesson-viewer{order:1;min-height:520px}.landing-hero{min-height:auto;padding-top:60px;padding-bottom:72px}.hero-cube-scene{opacity:.28}.hero-cube{right:-90px;top:18%;width:240px;height:240px}.hero-cube span:first-child{transform:translateZ(120px)}.hero-cube span:nth-child(2){transform:rotateY(90deg) translateZ(120px)}.hero-cube span:nth-child(3){transform:rotateX(90deg) translateZ(120px)}.audience-grid,.feature-grid,.lesson-band,.steps-grid{grid-template-columns:1fr}.lesson-band{padding:28px}.phone-mock{min-height:320px}.filter-panel{position:static}.stats-grid{grid-template-columns:repeat(2,1fr)}.topbar{align-items:flex-start;flex-direction:column;gap:10px;padding:14px 18px}.topnav{flex-wrap:wrap}.auth-page,.constructor-save-panel,.cube-row,.dashboard-cube-main,.profile-setup{grid-template-columns:1fr}}