:root{--bg:#f7fafc;--card:#fff;--text:#0f172a;--muted:#64748b;--line:#e2e8f0;--accent:#0f766e;--accent2:#14b8a6;--shadow:0 14px 42px rgba(15,23,42,.08)}html[data-theme=dark]{--bg:#071016;--card:#0c1821;--text:#e5eef5;--muted:#94a3b8;--line:#1f3340;--accent:#2dd4bf;--accent2:#5eead4;--shadow:0 18px 44px rgba(0,0,0,.25)}*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at 15% 5%,rgba(20,184,166,.12),transparent 28%),var(--bg);color:var(--text);font-family:Tahoma,Arial,sans-serif;line-height:1.75}.container{width:min(1180px,92%);margin:auto}.topbar{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 86%,transparent);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}.nav{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;color:var(--text)}.brand small{display:block;color:var(--muted);font-size:11px}.logo{display:grid;place-items:center;width:42px;height:42px;border-radius:13px;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#001714;font-weight:900}.nav nav{display:flex;align-items:center;gap:16px;flex-wrap:wrap}.nav nav a{color:var(--text);text-decoration:none;font-size:14px}.pill,.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 18px;border-radius:12px;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#001714!important;font-weight:700;text-decoration:none;border:0;cursor:pointer}.btn.secondary{background:transparent;border:1px solid var(--line);color:var(--text)!important}.mode-toggle{border:1px solid var(--line);background:var(--card);color:var(--text);border-radius:12px;padding:9px 12px;cursor:pointer}.hero{padding:86px 0 58px}.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:42px;align-items:center}.eyebrow{display:inline-flex;padding:6px 11px;border-radius:999px;border:1px solid color-mix(in srgb,var(--accent) 35%,var(--line));background:color-mix(in srgb,var(--accent) 9%,var(--card));color:var(--accent);font-size:13px}.hero h1{font-size:clamp(36px,5vw,68px);line-height:1.15;margin:18px 0}.hero p{font-size:19px;color:var(--muted);max-width:720px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:25px}.quality-orbit{min-height:410px;border:1px solid var(--line);background:linear-gradient(180deg,color-mix(in srgb,var(--card) 95%,transparent),var(--card));border-radius:32px;box-shadow:var(--shadow);position:relative;overflow:hidden;display:grid;place-items:center}.quality-orbit:before,.quality-orbit:after{content:"";position:absolute;border:1px dashed color-mix(in srgb,var(--accent) 45%,var(--line));border-radius:50%;width:280px;height:280px;animation:spin 18s linear infinite}.quality-orbit:after{width:190px;height:190px;animation-direction:reverse;animation-duration:12s}.quality-core{width:130px;height:130px;border-radius:35px;background:linear-gradient(135deg,var(--accent),var(--accent2));display:grid;place-items:center;color:#001714;font-size:34px;font-weight:900;z-index:2;box-shadow:0 25px 60px rgba(20,184,166,.25)}@keyframes spin{to{transform:rotate(360deg)}}section{padding:48px 0}.section-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:22px}.section-head h2{font-size:32px;margin:0}.muted{color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.card{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:var(--shadow)}.card h3{margin-top:0}.stat{font-size:34px;font-weight:900}.badge{display:inline-block;padding:5px 9px;border-radius:999px;background:color-mix(in srgb,var(--accent) 12%,var(--card));color:var(--accent);font-size:12px}.course-card{display:flex;flex-direction:column;min-height:250px}.course-card .grow{flex:1}.progress{height:9px;background:color-mix(in srgb,var(--line) 80%,transparent);border-radius:999px;overflow:hidden}.progress i{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--accent2))}.form{max-width:760px}.field{margin:0 0 16px}.field label{display:block;font-weight:700;margin-bottom:6px}.input,textarea,select{width:100%;padding:12px 14px;border:1px solid var(--line);background:var(--card);color:var(--text);border-radius:12px;outline:none}.input:focus,textarea:focus,select:focus{border-color:var(--accent)}textarea{min-height:150px}.notice{padding:13px 15px;border:1px solid var(--line);background:var(--card);border-radius:14px;margin-bottom:16px}.success{border-color:color-mix(in srgb,var(--accent) 60%,var(--line))}.question{margin:22px 0;padding:20px;border:1px solid var(--line);border-radius:18px;background:var(--card)}.question label.option{display:block;padding:10px 12px;border:1px solid var(--line);border-radius:10px;margin-top:8px;cursor:pointer}.searchbox{display:flex;gap:10px}.searchbox .input{flex:1}.table-wrap{overflow:auto}.table{width:100%;border-collapse:collapse}.table th,.table td{padding:11px;border-bottom:1px solid var(--line);text-align:right;white-space:nowrap}.admin-grid{display:grid;grid-template-columns:220px 1fr;gap:20px;padding:28px 0}.admin-menu{display:flex;flex-direction:column;gap:8px}.admin-menu a{padding:10px 12px;border-radius:10px;color:var(--text);text-decoration:none}.admin-menu a:hover{background:var(--card)}footer{margin-top:50px;border-top:1px solid var(--line);padding:40px 0 16px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:24px}.footer-grid a{display:block;color:var(--muted);text-decoration:none;margin-top:7px}.footer-bottom{border-top:1px solid var(--line);margin-top:30px;padding-top:16px;display:flex;justify-content:space-between;color:var(--muted);font-size:13px}.share-card{width:min(700px,100%);aspect-ratio:1200/630;border-radius:26px;background:linear-gradient(135deg,#08141c,#12372f);color:white;padding:34px;display:flex;flex-direction:column;justify-content:space-between}.share-score{font-size:54px;font-weight:900}@media(max-width:900px){.hero-grid,.grid,.footer-grid,.admin-grid{grid-template-columns:1fr}.nav{align-items:flex-start;padding:12px 0}.nav nav{justify-content:flex-end}.hero{padding-top:45px}.quality-orbit{min-height:300px}.admin-menu{flex-direction:row;overflow:auto}.section-head{align-items:flex-start;flex-direction:column}}

/* v1.1 — brighter geometric identity */
body{position:relative;overflow-x:hidden;background:
radial-gradient(circle at 8% 8%,rgba(56,189,248,.18),transparent 22%),
radial-gradient(circle at 88% 18%,rgba(168,85,247,.13),transparent 24%),
radial-gradient(circle at 72% 82%,rgba(20,184,166,.15),transparent 26%),var(--bg)}
main,footer{position:relative;z-index:1}.ambient-geometry{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden;opacity:.82}.ambient-geometry i{position:absolute;display:block;filter:blur(.1px);animation:geoFloat 16s ease-in-out infinite alternate}.ambient-geometry i:nth-child(1){width:190px;height:190px;right:-55px;top:14%;border:1px solid color-mix(in srgb,var(--accent) 34%,transparent);border-radius:38px;transform:rotate(25deg);background:linear-gradient(135deg,color-mix(in srgb,var(--accent) 12%,transparent),transparent)}.ambient-geometry i:nth-child(2){width:150px;height:150px;left:3%;top:46%;border:1px solid rgba(56,189,248,.25);clip-path:polygon(50% 0,100% 100%,0 100%);background:linear-gradient(145deg,rgba(56,189,248,.09),transparent);animation-delay:-4s}.ambient-geometry i:nth-child(3){width:220px;height:220px;left:-90px;bottom:3%;border:22px solid rgba(168,85,247,.07);border-radius:50%;animation-delay:-8s}.ambient-geometry i:nth-child(4){width:90px;height:90px;right:18%;bottom:12%;border:1px dashed color-mix(in srgb,var(--accent) 38%,transparent);transform:rotate(45deg);animation-duration:12s;animation-delay:-2s}.ambient-geometry i:nth-child(5){width:44px;height:44px;left:26%;top:19%;background:linear-gradient(135deg,rgba(251,191,36,.18),rgba(20,184,166,.08));border-radius:12px;transform:rotate(20deg);animation-duration:10s;animation-delay:-6s}@keyframes geoFloat{0%{translate:0 0;rotate:-3deg}50%{translate:18px -14px;rotate:7deg}100%{translate:-12px 20px;rotate:-5deg}}
.card{position:relative;overflow:hidden;transition:transform .24s ease,border-color .24s ease,box-shadow .24s ease}.card:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--accent) 28%,var(--line))}.stat-card:before,.feature-card:before{content:"";position:absolute;width:110px;height:110px;left:-36px;top:-42px;border-radius:28px;transform:rotate(30deg);background:linear-gradient(135deg,color-mix(in srgb,var(--accent) 13%,transparent),transparent)}
.course-card{isolation:isolate}.course-card:before{content:"";position:absolute;inset:auto -40px -70px auto;width:150px;height:150px;border-radius:50%;background:radial-gradient(circle,color-mix(in srgb,var(--accent) 10%,transparent),transparent 67%);z-index:-1}.course-card-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}.course-icon{width:54px;height:54px;border-radius:17px;display:grid;place-items:center;position:relative;color:var(--accent);background:linear-gradient(145deg,color-mix(in srgb,var(--accent) 16%,var(--card)),color-mix(in srgb,#38bdf8 8%,var(--card)));border:1px solid color-mix(in srgb,var(--accent) 24%,var(--line));box-shadow:0 12px 30px rgba(15,118,110,.08)}.course-icon svg{width:29px;height:29px}.course-icon small{position:absolute;left:-5px;bottom:-6px;min-width:20px;height:20px;display:grid;place-items:center;padding:0 4px;border-radius:7px;background:var(--text);color:var(--bg);font-size:9px;font-weight:800}.course-actions{display:flex;align-items:center;gap:10px}.course-actions .btn{flex:1}.icon-btn,.share-course{border:1px solid var(--line);background:color-mix(in srgb,var(--card) 88%,transparent);color:var(--text);cursor:pointer;transition:.2s ease}.icon-btn{width:43px;height:43px;border-radius:13px;display:grid;place-items:center;font-size:20px}.icon-btn:hover,.share-course:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-1px)}.share-course{display:inline-flex;gap:8px;align-items:center;padding:10px 14px;border-radius:13px;white-space:nowrap}.course-hero{display:flex;align-items:flex-start;gap:20px;padding:10px 0 6px}.course-hero-icon .course-icon{width:78px;height:78px;border-radius:23px}.course-hero-icon .course-icon svg{width:40px;height:40px}.grow{flex:1}.progress-card{margin:20px 0}.progress-title{display:flex;align-items:center;justify-content:space-between;gap:14px}.progress-title a{font-size:13px;color:var(--accent);text-decoration:none}.lesson-card.is-done{outline:1px solid var(--accent);background:linear-gradient(145deg,color-mix(in srgb,var(--accent) 7%,var(--card)),var(--card))}.lesson-card.is-done:after{content:"✓";position:absolute;left:14px;top:14px;width:24px;height:24px;border-radius:50%;display:grid;place-items:center;background:var(--accent);color:#001714;font-weight:900}.lesson-top{display:flex;align-items:center;justify-content:space-between;gap:12px}.lesson-content p{font-size:17px;line-height:2}.feature-icon{width:48px;height:48px;display:grid;place-items:center;border-radius:15px;background:linear-gradient(135deg,color-mix(in srgb,var(--accent) 18%,var(--card)),color-mix(in srgb,#38bdf8 9%,var(--card)));color:var(--accent);font-size:24px;font-weight:900;margin-bottom:14px}.user-link{font-weight:700;color:var(--accent)!important}.login-pill{font-size:13px!important;padding:9px 14px}.verification-code{display:inline-flex;margin-inline-start:8px;padding:3px 10px;border-radius:9px;background:color-mix(in srgb,var(--accent) 12%,var(--card));color:var(--accent);font-size:21px;letter-spacing:5px;font-weight:900}.share-toast{position:fixed;left:50%;bottom:28px;translate:-50% 20px;opacity:0;z-index:99;padding:10px 18px;border-radius:12px;background:var(--text);color:var(--bg);box-shadow:var(--shadow);transition:.22s ease;pointer-events:none}.share-toast.show{translate:-50% 0;opacity:1}
.quality-orbit{background:linear-gradient(160deg,color-mix(in srgb,var(--card) 94%,transparent),color-mix(in srgb,var(--accent) 8%,var(--card)))}.quality-orbit:before{box-shadow:0 0 80px color-mix(in srgb,var(--accent) 12%,transparent)}.orbit-dot{position:absolute;width:17px;height:17px;border-radius:6px;background:linear-gradient(135deg,#38bdf8,var(--accent2));box-shadow:0 7px 24px rgba(56,189,248,.28);animation:dotFloat 6s ease-in-out infinite}.orbit-dot.d1{top:20%;right:22%}.orbit-dot.d2{bottom:19%;left:24%;animation-delay:-2s;background:linear-gradient(135deg,#a855f7,#38bdf8)}.orbit-dot.d3{top:47%;left:13%;animation-delay:-4s;background:linear-gradient(135deg,#fbbf24,var(--accent2))}@keyframes dotFloat{50%{transform:translateY(-15px) rotate(20deg)}}
@media(max-width:900px){.course-hero{flex-wrap:wrap}.course-hero .grow{flex-basis:calc(100% - 110px)}.share-course{margin-inline-start:auto}.progress-title{align-items:flex-start;flex-direction:column}.login-pill{max-width:180px;text-align:center;line-height:1.3}.ambient-geometry{opacity:.55}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.001ms!important;animation-iteration-count:1!important;scroll-behavior:auto!important;transition-duration:.001ms!important}}
.icon-btn svg,.share-svg svg{width:21px;height:21px;display:block}.nav-share{flex:0 0 auto}.share-svg{display:inline-grid;place-items:center}.share-course .share-svg svg{width:18px;height:18px}

/* v1.4 — branded protected 404 */
.error-page{min-height:100vh;display:grid;place-items:center}.error-shell{width:100%;min-height:100vh;display:grid;place-items:center;padding:34px 16px;position:relative;z-index:1}.error-card{width:min(820px,94vw);text-align:center;background:color-mix(in srgb,var(--card) 92%,transparent);border:1px solid var(--line);border-radius:34px;padding:clamp(28px,5vw,58px);box-shadow:var(--shadow);backdrop-filter:blur(18px);position:relative;overflow:hidden}.error-card:before{content:"";position:absolute;inset:-120px auto auto -120px;width:300px;height:300px;border-radius:50%;background:radial-gradient(circle,color-mix(in srgb,var(--accent) 18%,transparent),transparent 67%);pointer-events:none}.error-brand{width:max-content;margin:0 auto 28px}.error-visual{width:220px;height:220px;margin:8px auto 28px;display:grid;place-items:center;position:relative}.error-visual b{font-size:68px;letter-spacing:-4px;z-index:2;background:linear-gradient(135deg,var(--accent),#38bdf8,#a855f7);-webkit-background-clip:text;background-clip:text;color:transparent}.error-ring{position:absolute;border-radius:50%;border:1px dashed color-mix(in srgb,var(--accent) 42%,var(--line));inset:12px;animation:spin 16s linear infinite}.error-ring.r2{inset:42px;border-style:solid;border-color:color-mix(in srgb,#38bdf8 30%,var(--line));animation-direction:reverse;animation-duration:10s}.error-card h1{font-size:clamp(30px,5vw,52px);line-height:1.25;margin:16px 0 10px}.error-card p{font-size:17px;max-width:620px;margin:0 auto}.error-actions{justify-content:center}.error-actions .mode-toggle{min-width:46px}@media(max-width:600px){.error-visual{width:170px;height:170px}.error-visual b{font-size:54px}.error-card{border-radius:26px}}

/* v1.6 — learning flow, install/font tools, richer analytics */
.font-tools{display:inline-flex;gap:5px}.font-tools .icon-btn{font-weight:900;min-width:38px;padding:7px 8px}.pwa-install{opacity:.72}.pwa-install.is-ready{opacity:1;box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 12%,transparent)}
.icon-btn{border:1px solid var(--line);background:var(--card);color:var(--text);border-radius:12px;padding:8px;cursor:pointer;display:inline-grid;place-items:center}.icon-btn:disabled{opacity:.45;cursor:not-allowed}
.breadcrumbs{display:flex;flex-wrap:wrap;gap:7px;align-items:center;font-size:13px;color:var(--muted);margin:0 0 18px}.breadcrumbs a{color:var(--accent);text-decoration:none}.breadcrumbs .sep{opacity:.5}
.lesson-navigation{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-top:20px;flex-wrap:wrap}.lesson-navigation .next-lesson{display:inline-flex;gap:8px;align-items:center}.lesson-navigation .next-lesson span{font-size:20px}
.btn.is-complete,.btn:disabled.is-complete{background:color-mix(in srgb,var(--muted) 12%,var(--card));border:1px solid var(--line);color:var(--muted)!important;box-shadow:none;opacity:.72;cursor:default}.completed-form{pointer-events:none}
.knowledge-check{margin-top:26px}.quick-question{padding:18px;border:1px solid var(--line);border-radius:17px;background:color-mix(in srgb,var(--card) 96%,transparent);margin-top:14px}.quick-options{display:grid;gap:8px;margin-top:12px}.quick-option{width:100%;text-align:right;padding:11px 13px;border:1px solid var(--line);border-radius:11px;background:var(--card);color:var(--text);cursor:pointer}.quick-option:hover{border-color:var(--accent)}.quick-option.correct{border-color:#16a34a;background:color-mix(in srgb,#16a34a 10%,var(--card))}.quick-option.wrong{border-color:#dc2626;background:color-mix(in srgb,#dc2626 8%,var(--card))}.quick-feedback{margin-top:10px;padding:10px 12px;border-radius:10px;background:color-mix(in srgb,var(--accent) 8%,var(--card));display:none}.quick-feedback.show{display:block}
.track-heading{margin:38px 0 14px;padding:18px 20px;border-radius:20px;border:1px solid var(--line);background:linear-gradient(135deg,color-mix(in srgb,var(--accent) 8%,var(--card)),var(--card));display:flex;justify-content:space-between;gap:16px;align-items:center}.track-heading h2{margin:0;font-size:25px}.track-heading h2 small{display:block;font-size:13px;color:var(--muted);font-weight:600;margin-top:3px}.track-heading .track-count{color:var(--muted);font-size:13px}
.course-views{display:inline-flex;align-items:center;gap:6px;margin-top:12px;color:var(--muted);font-size:13px}.course-views:before{content:"◉";color:var(--accent)}
.footer-visits{display:inline-flex;flex-direction:column;margin-top:12px;padding:10px 14px;border:1px solid var(--line);border-radius:14px;background:color-mix(in srgb,var(--accent) 6%,var(--card))}.footer-visits b{font-size:24px;color:var(--accent)}
.tool-intro{padding:12px 14px;border-radius:13px;background:color-mix(in srgb,var(--accent) 7%,var(--card));margin-bottom:16px}.term{font-weight:800;color:var(--accent)}.tool-benefits{margin:10px 0 0;padding:0 20px}.tool-benefits li{margin:6px 0}.tool-card h3 small{display:block;color:var(--muted);font-size:13px;font-weight:600;margin-top:4px}
.email-status-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:14px 0}.status-chip{padding:12px;border:1px solid var(--line);border-radius:13px;background:var(--card)}.status-chip b{display:block}.status-chip.ok b{color:#16a34a}.status-chip.warn b{color:#d97706}
.admin-actions{display:flex;gap:8px;flex-wrap:wrap}.mini-btn{display:inline-flex;padding:6px 10px;border-radius:9px;border:1px solid var(--line);background:var(--card);color:var(--text);text-decoration:none;cursor:pointer;font-size:12px}.mini-btn.danger{color:#b91c1c}.metric-row{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.metric-card{padding:16px;border:1px solid var(--line);border-radius:16px;background:var(--card)}.metric-card b{font-size:26px;display:block}.analytics-table td{white-space:normal;min-width:90px}.ip-code{font-family:monospace;direction:ltr;display:inline-block}
@media(max-width:900px){.font-tools{display:none}.metric-row,.email-status-grid{grid-template-columns:1fr 1fr}.track-heading{align-items:flex-start;flex-direction:column}}
@media(max-width:560px){.metric-row,.email-status-grid{grid-template-columns:1fr}.lesson-navigation{align-items:stretch}.lesson-navigation a{width:100%;justify-content:center}}