.lp{min-height:100vh;min-height:100dvh;background:var(--page-bg);color:var(--navy)}.lp-nav{position:sticky;top:0;z-index:50;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:#f4f6fcd1;border-bottom:1px solid rgba(15,23,42,.06)}.lp-nav-inner{max-width:1200px;margin:0 auto;padding:16px 26px;display:flex;align-items:center;justify-content:space-between;gap:16px}.lp-nav-brand{border:none;background:none;padding:0;cursor:pointer;font-family:inherit}.lp-nav-links{display:flex;align-items:center;gap:8px}.lp-nav-links button{border:none;background:none;font-family:inherit;font-size:13.5px;font-weight:600;color:var(--muted);padding:9px 14px;border-radius:99px;cursor:pointer;transition:.15s}.lp-nav-links button:hover{color:var(--navy);background:#0f172a0d}.lp-nav-cta{background:var(--hero-gradient)!important;color:#fff!important;box-shadow:0 8px 18px -8px #4338ca8c}.lp-nav-cta:hover{filter:brightness(1.05);color:#fff!important}.lp-hero{position:relative;isolation:isolate;overflow:hidden;min-height:clamp(460px,58vw,620px);color:#fff;background:#6d28d9}.lp-hero-photo{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;object-fit:cover;object-position:center 46%;z-index:0;pointer-events:none;-webkit-user-select:none;user-select:none;filter:contrast(1.05) saturate(1.05)}.lp-hero-scrim{position:absolute;top:0;right:0;bottom:0;left:0;z-index:1;pointer-events:none;background:linear-gradient(270deg,#4338caf2,#5434d0e6 18%,#6d28d99e 30%,#6d28d938 38%,#6d28d90a,#6d28d900 58%),linear-gradient(180deg,rgba(30,20,90,.14) 0%,transparent 32%,rgba(30,20,90,.22) 100%);box-shadow:inset 0 0 130px 24px #1e145a42}.lp-hero-inner{position:relative;z-index:2;width:100%;max-width:none;margin:0;padding:56px clamp(24px,4vw,56px) 64px 67%;display:grid;grid-template-columns:minmax(0,1fr);justify-items:start;align-items:center;min-height:inherit}.lp-hero-copy{max-width:min(500px,100%);width:100%;margin-right:0}.lp-badge{display:inline-block;background:#ffffff1f;border:1px solid rgba(255,255,255,.28);padding:6px 14px;border-radius:99px;font-size:12.5px;font-weight:600;margin-bottom:18px}.lp-hero-copy h1{font-size:clamp(34px,5vw,52px);line-height:1.08;margin:0 0 18px;font-weight:800;letter-spacing:-.03em}.lp-hl{background:linear-gradient(90deg,var(--sun),#fde68a);-webkit-background-clip:text;background-clip:text;color:transparent}.lp-hero-copy p{font-size:16px;line-height:1.65;opacity:.92;max-width:480px;margin:0 0 28px}.lp-hero-ctas{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:34px}.lp-btn-primary{background:var(--sun);color:#3a2600;border:none;padding:14px 26px;border-radius:12px;font-weight:700;font-size:14.5px;cursor:pointer;font-family:inherit;box-shadow:0 12px 26px -10px #f59e0ba6;transition:.15s}.lp-btn-primary:hover{background:#fbbf24;transform:translateY(-1px)}.lp-btn-primary.lp-btn-lg{font-size:16px;padding:16px 32px}.lp-btn-secondary{background:#fff;color:var(--primary);border:2px solid rgba(255,255,255,.85);padding:12px 22px;border-radius:12px;font-weight:700;font-size:14px;cursor:pointer;font-family:inherit}.lp-btn-secondary:hover{background:#fffffff2}.lp-nav-demo{background:var(--hero-gradient)!important;color:#fff!important;border:none;padding:9px 16px;border-radius:99px;font-weight:700;font-size:13.5px;cursor:pointer;font-family:inherit;box-shadow:0 8px 18px -8px #4338ca8c}.lp-nav-demo:hover{filter:brightness(1.05);color:#fff!important}.lp-btn-ghost{background:#ffffff14;color:#fff;border:1px solid rgba(255,255,255,.38);padding:14px 22px;border-radius:12px;font-weight:600;font-size:14px;cursor:pointer;font-family:inherit;transition:.15s}.lp-btn-ghost:hover{background:#ffffff29}.lp-hero-stats{display:flex;gap:36px}.lp-hero-stats div{display:flex;flex-direction:column}.lp-hero-stats b{font-size:26px;font-weight:800;letter-spacing:-.02em}.lp-hero-stats span{font-size:12px;opacity:.82;margin-top:2px}.lp-tiles{max-width:1200px;margin:0 auto;padding:72px 26px 28px;text-align:center}.lp-tiles h2{font-size:clamp(26px,4vw,32px);margin:0 0 10px;font-weight:800;letter-spacing:-.02em;color:var(--navy)}.lp-tiles-sub{color:var(--muted);font-size:15px;max-width:560px;margin:0 auto 40px}.lp-tilegrid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;text-align:left}.lp-tile{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px;box-shadow:var(--sh-sm);transition:.18s;position:relative;overflow:hidden}.lp-tile:before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--tc, var(--brand))}.lp-tile:hover{transform:translateY(-4px);box-shadow:var(--sh);border-color:#dfe3ec}.lp-tile-ic{width:52px;height:52px;border-radius:14px;background:var(--soft2, #f1f3f8);display:flex;align-items:center;justify-content:center;font-size:26px;margin-bottom:14px}.lp-tile h3{margin:0 0 8px;font-size:16.5px;font-weight:700;color:var(--navy)}.lp-tile p{margin:0;font-size:13.5px;color:var(--muted);line-height:1.55}.lp-highlights{max-width:1200px;margin:0 auto;padding:20px 26px 48px;display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.lp-featcard{text-align:center;padding:22px 16px}.lp-feat-ic{font-size:32px;margin-bottom:12px}.lp-featcard h4{margin:0 0 8px;font-size:15.5px;font-weight:700;color:var(--navy)}.lp-featcard p{font-size:13px;color:var(--muted);line-height:1.55;max-width:280px;margin:0 auto}.lp-bottom{margin:0;border-radius:0;box-shadow:var(--shadow-hero)}.lp-bottom-inner{max-width:720px;margin:0 auto;padding:52px 30px calc(36px + env(safe-area-inset-bottom,0px));text-align:center}.lp-cta-block h2{margin:0 0 10px;font-size:28px;font-weight:800;color:#fff}.lp-cta-block p{margin:0 0 26px;font-size:15px;opacity:.92;color:#fff}.lp-foot-block{margin-top:40px;padding-top:28px;border-top:1px solid rgba(255,255,255,.18);display:flex;flex-direction:column;align-items:center;gap:12px}.lp-foot-block p{margin:0;font-size:13px;color:#ffffffc7}.lp-foot-block .brand-mark{margin:0 auto}@media (max-width: 980px){.lp-hero{min-height:clamp(520px,92vw,680px)}.lp-hero-photo{object-position:32% 40%;filter:contrast(1.05) saturate(1.05)}.lp-hero-scrim{background:linear-gradient(180deg,#4338cad1,#6d28d980 34%,#6d28d942 60%,#1e145a57);box-shadow:inset 0 0 100px 16px #1e145a4d}.lp-hero-inner{grid-template-columns:1fr;justify-items:center;padding:40px 24px 56px;text-align:center;align-items:end}.lp-hero-copy{max-width:560px;margin:0 auto}.lp-hero-copy p{margin-left:auto;margin-right:auto}.lp-hero-ctas,.lp-hero-stats{justify-content:center}.lp-tilegrid{grid-template-columns:1fr 1fr}.lp-highlights{grid-template-columns:1fr;gap:8px;padding-bottom:32px}.lp-nav-links button:not(.lp-nav-demo):not(.lp-nav-login){display:none}.lp-nav-login,.lp-nav-demo{display:inline-flex!important}}@media (max-width: 640px){.lp-tilegrid,.lp-highlights{grid-template-columns:1fr}.lp-nav-inner{padding:14px 18px}.lp-hero-inner{padding:28px 18px 48px}.lp-hero-stats{gap:20px;flex-wrap:wrap;justify-content:center}.lp-hero-stats b{font-size:22px}.lp-hero-ctas{flex-direction:column;align-items:stretch}.lp-btn-primary{width:100%;justify-content:center;text-align:center}.lp-tiles{padding:48px 18px 24px}.lp-bottom{margin:0;border-radius:0}.lp-bottom-inner{padding:40px 20px calc(28px + env(safe-area-inset-bottom,0px))}.lp-cta-block h2{font-size:22px}.lp-foot-block{margin-top:32px;padding-top:24px}}.grade-picker{display:flex;flex-direction:column;gap:8px}.grade-picker-label{font-size:13px;font-weight:700;color:var(--ink)}.grade-picker-options{display:grid;grid-template-columns:1fr 1fr;gap:10px}.grade-picker-option{display:flex;flex-direction:column;align-items:flex-start;gap:2px;padding:12px 14px;border-radius:14px;border:1.5px solid var(--line);background:var(--surface-2);text-align:left;transition:border-color .15s,box-shadow .15s,background .15s}.grade-picker-option:hover{border-color:#6366f173}.grade-picker-option.active{border-color:var(--primary, #6366f1);background:#6366f114;box-shadow:0 0 0 2px #6366f126}.grade-picker-option-title{font-size:15px;font-weight:800;color:var(--ink)}.grade-picker-option-sub{font-size:11px;color:var(--ink);font-weight:600}.auth-card .grade-picker,.demo-signup-card .grade-picker{margin-bottom:14px}.demo-signup-card .grade-picker-label{color:#1e293b}.auth-page{min-height:100vh;min-height:100dvh;position:relative;overflow:hidden}.auth-page-inner{min-height:100vh;min-height:100dvh;display:flex;align-items:center;justify-content:center;padding:72px 20px 32px}.auth-back{position:absolute;top:20px;left:24px;z-index:2;border:none;background:#ffffff1a;border:1px solid rgba(255,255,255,.28);color:#fff;font-family:inherit;font-size:13.5px;font-weight:600;padding:9px 16px;border-radius:99px;cursor:pointer;transition:.15s;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.auth-back:hover{background:#ffffff2e}.auth-card{width:100%;max-width:420px;background:#fffffff0;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid rgba(255,255,255,.65);border-radius:24px;box-shadow:0 24px 60px -24px #0f172a59,0 0 0 1px #fff6 inset;padding:32px 28px 28px;color:var(--ink)}.auth-card-head{display:flex;flex-direction:column;align-items:center;gap:14px;margin-bottom:22px}.auth-card h2{margin:0 0 8px;text-align:center;font-size:20px;font-weight:800;color:var(--ink)}.auth-lead{margin:0 0 18px;font-size:14px;line-height:1.5;color:var(--ink);text-align:center}.auth-brand.brand-mark--stacked{gap:10px}.auth-badge{display:inline-block;background:var(--primary-soft);color:var(--primary-600);border:1px solid rgba(99,102,241,.2);padding:5px 12px;border-radius:99px;font-size:11.5px;font-weight:600;letter-spacing:.1px}.auth-tabs{display:grid;grid-template-columns:1fr 1fr;gap:6px;padding:5px;background:var(--surface-2);border-radius:14px;margin-bottom:16px}.auth-tab{border:none;background:transparent;font-family:inherit;font-size:13.5px;font-weight:600;color:var(--ink-soft);padding:10px 12px;border-radius:10px;cursor:pointer;transition:.15s}.auth-tab:hover{color:var(--ink)}.auth-tab.active{background:#fff;color:var(--primary-600);box-shadow:0 2px 8px #1e225a14}.auth-form .field{margin:12px 0}.auth-form .field input{background:#fff}.input-with-toggle{position:relative;display:flex;align-items:center}.input-with-toggle input{width:100%;padding-right:78px}.pw-toggle{position:absolute;right:6px;top:50%;transform:translateY(-50%);border:none;background:var(--surface-2);color:var(--ink-soft);font-family:inherit;font-size:12px;font-weight:600;padding:6px 10px;border-radius:8px;cursor:pointer;transition:.15s}.pw-toggle:hover{background:var(--primary-soft);color:var(--primary-600)}.auth-forgot{display:inline-block;margin:8px 0 0;padding:0;border:none;background:none;color:var(--primary-600);font-family:inherit;font-size:12.5px;font-weight:600;cursor:pointer}.auth-forgot:hover{text-decoration:underline}.auth-err{color:var(--red);font-size:13px;margin:10px 0 4px;padding:10px 12px;background:var(--red-soft);border-radius:10px}.auth-ok{color:#047857;font-size:13px;margin:10px 0 4px;padding:10px 12px;background:#10b9811a;border-radius:10px;line-height:1.5}.auth-dev-password{margin:10px 0 0;font-size:14px;color:var(--ink)}.auth-dev-password strong{display:inline-block;margin-top:4px;padding:6px 10px;border-radius:8px;background:#0f172a0f;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;letter-spacing:.06em}.auth-submit{width:100%;margin-top:18px;border:none;background:var(--hero-gradient);color:#fff;font-family:inherit;font-size:14.5px;font-weight:700;padding:14px 20px;border-radius:12px;cursor:pointer;box-shadow:0 10px 22px -10px #4338ca8c;transition:.15s}.auth-submit:hover:not(:disabled){filter:brightness(1.05);transform:translateY(-1px)}.auth-submit:disabled{opacity:.6;cursor:default;transform:none}@media (max-width: 480px){.auth-page-inner{padding:64px 14px 24px;align-items:flex-start}.auth-back{top:14px;left:14px;font-size:13px;padding:8px 14px}.auth-card{padding:26px 20px 22px;border-radius:20px}.auth-form .field input{padding:12px;font-size:16px}}.demo-shell{min-height:100vh;min-height:100dvh;background:linear-gradient(180deg,#f5f3ff,#fafafa 40%,#fff)}.demo-topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 20px;border-bottom:1px solid var(--line);background:#ffffffe6;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);position:sticky;top:0;z-index:10}.demo-badge{font-size:12px;font-weight:600;color:var(--primary);background:var(--primary-soft);padding:6px 12px;border-radius:999px}.demo-main{max-width:1100px;margin:0 auto;padding:20px 16px 40px}.demo-steps{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px}.demo-step{font-size:12px;font-weight:600;color:var(--muted);padding:6px 12px;border-radius:999px;background:#fff;border:1px solid var(--line)}.demo-step.active{color:var(--primary);border-color:#c7d2fe;background:#eef2ff}.demo-step.done{color:var(--green);border-color:#bbf7d0;background:#f0fdf4}.demo-hero{padding:28px 24px;background:linear-gradient(135deg,#ede9fe,#fff 70%);border-color:#d9d6fe}.demo-hero h2{margin:0 0 8px}.demo-hero p{margin:0;line-height:1.6;color:var(--muted)}.demo-pill-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}.demo-tutor-panel{display:flex;flex-direction:column;gap:12px}.demo-tutor-thread{overflow-y:auto;display:flex;flex-direction:column;gap:10px;min-height:180px;max-height:280px;padding:8px 0}.demo-tutor-bubble{max-width:88%;padding:10px 14px;border-radius:14px;font-size:14px;line-height:1.5}.demo-tutor-bubble.user{align-self:flex-end;background:var(--primary);color:#fff}.demo-tutor-bubble.assistant{align-self:flex-start;background:#f4f4f5;border:1px solid var(--line)}.demo-limit-banner{padding:12px 14px;border-radius:12px;background:#fff7ed;border:1px solid #fed7aa;font-size:13px;line-height:1.5}.demo-signup-page{min-height:100vh;min-height:100dvh;display:flex;align-items:center;justify-content:center;padding:24px 16px;background:linear-gradient(135deg,#5b21b6,#7c3aed 45%,#a78bfa)}.demo-signup-card{width:100%;max-width:440px;padding:28px 24px;border-radius:20px;background:#fffffff7;box-shadow:0 24px 60px -20px #00000059}.demo-signup-card h1{margin:16px 0 8px;font-size:1.5rem}.demo-signup-card p{margin:0 0 20px;color:var(--ink);font-size:14px;line-height:1.5}.demo-signup-login-link{color:var(--ink)}.demo-field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}.demo-field label{font-size:13px;font-weight:600}.demo-field input{padding:12px 14px;border:1px solid var(--line);border-radius:12px;font-family:inherit;font-size:16px}.demo-error{color:var(--bad);font-size:13px;margin-bottom:12px}.profile-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;background:#0f172a59;display:flex;align-items:flex-start;justify-content:flex-end;padding:72px 24px 24px;padding-bottom:max(24px,env(safe-area-inset-bottom));padding-right:max(24px,env(safe-area-inset-right))}.profile-panel{width:min(400px,100%);max-height:calc(100vh - 96px);max-height:calc(100dvh - 96px);overflow-y:auto;padding:20px;box-shadow:0 24px 60px -20px #0f172a59}.profile-head{display:flex;gap:14px;align-items:flex-start;margin-bottom:18px;position:relative}.profile-head h3{margin:0 0 4px;font-size:1.1rem}.profile-head p{margin:0 0 8px;font-size:12.5px}.profile-avatar-lg{width:48px;height:48px;border-radius:14px;background:var(--hero-gradient);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1.2rem;flex-shrink:0}.profile-close{position:absolute;top:0;right:0;width:32px;height:32px;border-radius:8px;border:1px solid var(--line);background:var(--surface-2);font-size:14px;cursor:pointer}.profile-section{margin-bottom:16px}.profile-section h4{margin:0 0 6px;font-size:13px}.profile-section input{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:10px;font-family:inherit;font-size:14px;background:var(--surface);color:var(--ink)}.profile-theme-slider{display:flex;align-items:center;gap:12px;padding:4px 0}.theme-slider-label{font-size:12.5px;font-weight:600;color:var(--ink-faint);transition:color .2s;min-width:58px}.theme-slider-label.active{color:var(--ink)}.theme-slider-track{position:relative;width:54px;height:30px;flex-shrink:0;border-radius:999px;border:1px solid var(--line);background:linear-gradient(135deg,#fef3c7,#e0e7ff);cursor:pointer;padding:2px;display:flex;align-items:center;transition:background .25s,box-shadow .2s}.theme-slider-track.is-dark{background:linear-gradient(135deg,#4338ca,#0f1222)}.theme-slider-track:focus-visible{outline:2px solid var(--primary);outline-offset:2px}.theme-slider-thumb{display:block;width:26px;height:26px;border-radius:50%;background:#fff;box-shadow:0 2px 8px #0f172a33;transition:margin .22s cubic-bezier(.34,1.4,.64,1);margin-left:0}.theme-slider-track.is-dark .theme-slider-thumb{margin-left:auto}.profile-theme-toggle{display:flex;gap:8px}.theme-chip{flex:1;padding:10px 12px;border-radius:10px;border:1px solid var(--line);background:var(--surface-2);font-family:inherit;font-size:13px;font-weight:600;cursor:pointer;transition:.15s}.theme-chip.on{border-color:var(--primary);background:var(--primary-soft);color:var(--primary-600)}.profile-password-fields{display:flex;flex-direction:column;gap:8px;margin-bottom:10px}.profile-err{padding:10px 12px;border-radius:10px;background:var(--red-soft);color:var(--red);font-size:13px;margin-bottom:10px}.profile-ok{padding:10px 12px;border-radius:10px;background:var(--green-soft);color:var(--green);font-size:13px;margin-bottom:10px}.profile-actions{margin-top:8px}.profile-actions .btn{width:100%}@media (max-width: 480px){.profile-overlay{padding:60px 12px 12px;justify-content:center}}.demo-banner{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:16px;padding:14px 18px;border-radius:12px;background:linear-gradient(135deg,var(--primary-soft) 0%,#f3eeff 100%);border:1px solid rgba(99,64,200,.15)}.demo-banner-text{font-size:14px;line-height:1.5;color:var(--text)}.demo-banner-cta{flex-shrink:0;padding:8px 14px;border:none;border-radius:8px;background:var(--primary);color:#fff;font-size:13px;font-weight:600;cursor:pointer}.demo-banner-cta.ghost{background:transparent;color:var(--primary);border:1px solid rgba(99,64,200,.35)}.demo-banner-actions{display:flex;flex-wrap:wrap;gap:8px}.demo-banner-cta:disabled{opacity:.7;cursor:wait}.demo-banner--compact{margin-bottom:12px;padding:10px 14px;font-size:13px}.demo-topbar-badge{display:inline-block;margin-top:4px;padding:2px 8px;border-radius:999px;background:var(--primary-soft);color:var(--primary);font-size:11px;font-weight:700;letter-spacing:.03em;text-transform:uppercase}.subject-cover{position:relative;display:flex;flex-direction:column;width:100%;min-height:220px;padding:0;border:2px solid transparent;border-radius:20px;overflow:hidden;text-align:left;cursor:pointer;font:inherit;color:#fff;box-shadow:0 18px 40px -24px #0f172a73;transition:transform .2s ease,box-shadow .2s ease,border-color .2s}.subject-cover:hover{transform:translateY(-4px);box-shadow:0 24px 48px -20px #0f172a80}.subject-cover.is-active{border-color:#ffffffa6;box-shadow:0 0 0 3px #6366f159,0 24px 48px -20px #0f172a80}.subject-cover--science{background:linear-gradient(145deg,#0f766e,#1d4ed8 52%,#312e81)}.subject-cover--maths{background:linear-gradient(145deg,#6d28d9,#4f46e5 48%,#312e81)}.subject-cover-art{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;opacity:.9}.subject-cover-svg{position:absolute;right:-8px;bottom:24px;width:58%;max-width:220px;height:auto}.subject-cover-body{position:relative;z-index:1;display:flex;flex-direction:column;gap:6px;padding:22px 22px 16px;flex:1}.subject-cover-label{font-size:10px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;opacity:.85}.subject-cover-title{margin:0;font-size:1.55rem;font-weight:800;line-height:1.15;letter-spacing:-.02em;max-width:72%}.subject-cover-sub{margin:0;font-size:13px;line-height:1.45;opacity:.88;max-width:70%}.subject-cover-metrics{display:flex;gap:18px;margin-top:10px}.subject-cover-metric{display:flex;flex-direction:column;gap:0}.subject-cover-metric b{font-size:1.15rem;line-height:1.1}.subject-cover-metric span{font-size:10px;opacity:.8;text-transform:uppercase;letter-spacing:.06em}.subject-cover-progress{margin-top:auto;padding-top:12px}.subject-cover-progress-bar{height:5px;border-radius:999px;background:#ffffff38;overflow:hidden}.subject-cover-progress-bar span{display:block;height:100%;border-radius:inherit;background:#ffffffeb;transition:width .3s ease}.subject-cover-progress-label{display:block;margin-top:6px;font-size:11px;opacity:.8}.subject-cover-cta{position:relative;z-index:1;padding:12px 22px 16px;font-size:12px;font-weight:700;letter-spacing:.04em;background:#0000001f;border-top:1px solid rgba(255,255,255,.12)}@media (max-width: 640px){.subject-cover{min-height:200px}.subject-cover-title{font-size:1.35rem;max-width:85%}.subject-cover-sub{max-width:85%}}.welcome-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;display:flex;align-items:center;justify-content:center;padding:24px;padding-top:max(24px,env(safe-area-inset-top));padding-bottom:max(24px,env(safe-area-inset-bottom));background:#0f172a8c;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);animation:welcome-fade-in .35s ease}.welcome-modal{position:relative;width:min(520px,100%);max-height:min(92vh,900px);overflow-y:auto;padding:36px 32px 28px;border-radius:28px;background:var(--hero-gradient);color:#fff;box-shadow:0 32px 80px -20px #4338ca8c,0 0 0 1px #ffffff1f inset;animation:welcome-rise .45s cubic-bezier(.22,1,.36,1)}.welcome-mesh{position:absolute;top:0;right:0;bottom:0;left:0;background:var(--hero-mesh);opacity:.45;pointer-events:none}.welcome-close{position:absolute;top:14px;right:14px;z-index:2;width:36px;height:36px;border-radius:50%;border:1px solid rgba(255,255,255,.25);background:#ffffff1a;color:#fff;font-size:14px;cursor:pointer;transition:background .15s}.welcome-close:hover{background:#fff3}.welcome-eyebrow{position:relative;margin:0 0 10px;font-size:11px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:#ffffffbf}.welcome-title{position:relative;margin:0 0 16px;font-size:clamp(2rem,6vw,2.75rem);font-weight:800;line-height:1.1;letter-spacing:-.02em}.welcome-message{position:relative;margin:0 0 16px;font-size:1.05rem;line-height:1.6;color:#ffffffeb;font-weight:500}.welcome-stats{position:relative;display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:22px}.welcome-stat{padding:12px 10px;border-radius:14px;background:#ffffff1f;border:1px solid rgba(255,255,255,.15);text-align:center}.welcome-stat b{display:block;font-size:1.35rem;font-weight:800;line-height:1.2}.welcome-stat span{display:block;margin-top:2px;font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:#ffffffb3}.welcome-cta{position:relative;width:100%;padding:14px 20px;border:none;border-radius:14px;background:#fff;color:var(--hero-from);font-family:inherit;font-size:15px;font-weight:800;cursor:pointer;transition:transform .15s,box-shadow .15s}.welcome-cta:hover{transform:translateY(-1px);box-shadow:0 8px 24px #00000026}.welcome-timer{position:relative;margin-top:18px;height:3px;border-radius:999px;background:#fff3;overflow:hidden}.welcome-timer-bar{display:block;height:100%;border-radius:inherit;background:#ffffffd9;transition:width .05s linear}@keyframes welcome-fade-in{0%{opacity:0}to{opacity:1}}@keyframes welcome-rise{0%{opacity:0;transform:translateY(24px) scale(.96)}to{opacity:1;transform:translateY(0) scale(1)}}@media (max-width: 480px){.welcome-modal{padding:30px 22px 24px;border-radius:22px}.welcome-stats{grid-template-columns:1fr}}.course-home{display:flex;flex-direction:column;gap:20px;max-width:1080px}.course-home-header{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:20px}.course-home-eyebrow{margin:0 0 4px;font-size:13px;font-weight:600;color:var(--primary);letter-spacing:.02em}.course-home-title{margin:0 0 8px;font-size:clamp(1.5rem,3vw,1.85rem);font-weight:800;letter-spacing:-.03em;color:var(--ink)}.course-home-lead{margin:0;max-width:520px;font-size:14px;line-height:1.55;color:var(--muted)}.course-home-header-stats{display:flex;flex-wrap:wrap;gap:10px}.header-stat{display:flex;flex-direction:column;align-items:center;min-width:72px;padding:12px 16px;border-radius:14px;background:var(--surface);border:1px solid var(--line);box-shadow:0 8px 24px -18px #0f172a33}.header-stat b{font-size:1.25rem;line-height:1.1;color:var(--ink)}.header-stat span{font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-top:2px}.header-stat.accent{background:linear-gradient(160deg,#fff1f2,#fff 70%);border-color:#fecdd3}.header-stat.accent b{color:#be123c}.course-covers{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}@media (max-width: 720px){.course-covers{grid-template-columns:1fr}}.course-toolbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;padding-top:4px;scroll-margin-top:80px}.course-track-tabs{display:flex;flex-wrap:wrap;gap:6px;padding:4px;border-radius:12px;background:var(--surface);border:1px solid var(--line)}.track-tab{padding:8px 16px;border:none;border-radius:9px;background:transparent;font:inherit;font-size:13px;font-weight:600;color:var(--muted);cursor:pointer;transition:background .15s,color .15s}.track-tab:hover{color:var(--ink);background:var(--hover-tint)}.track-tab.active{color:#fff;background:var(--primary);box-shadow:0 4px 12px -4px #6366f18c}.course-status-filters{display:flex;flex-wrap:wrap;gap:6px}.status-chip{padding:6px 12px;border-radius:999px;border:1px solid var(--line);background:var(--surface);font:inherit;font-size:12px;font-weight:600;color:var(--muted);cursor:pointer;transition:border-color .15s,background .15s,color .15s}.status-chip:hover{border-color:var(--accent-border);color:var(--ink)}.status-chip.on{border-color:var(--primary);background:var(--primary-soft);color:var(--primary-600)}.status-chip.clear{border-style:dashed;color:var(--primary)}.course-legend{display:flex;flex-wrap:wrap;gap:16px;padding:0 2px;font-size:12px;color:var(--muted)}.legend-item{display:inline-flex;align-items:center;gap:8px}.status-dot{display:inline-block;width:9px;height:9px;border-radius:50%;flex-shrink:0}.status-dot.not_started{background:#cbd5e1}.status-dot.in_progress{background:var(--amber);box-shadow:0 0 0 2px #fef3c7}.status-dot.mastered{background:var(--green);box-shadow:0 0 0 2px #d1fae5}.subject-zone{display:flex;flex-direction:column;gap:12px}.subject-zone-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;padding:0 2px}.subject-zone-head h2{margin:0;font-size:1.1rem;font-weight:800;color:var(--ink)}.subject-zone-meta{font-size:12px;font-weight:600;color:var(--muted)}.chapter-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}.chapter-card{display:flex;flex-direction:column;align-items:stretch;gap:8px;padding:16px;border:1px solid var(--line);border-radius:16px;background:var(--surface);text-align:left;cursor:pointer;font:inherit;color:inherit;box-shadow:0 10px 28px -22px #0f172a40;transition:transform .15s ease,box-shadow .15s ease,border-color .15s}.chapter-card:hover{transform:translateY(-3px);border-color:var(--accent-border);box-shadow:0 16px 36px -20px #4338ca47}.chapter-card.locked{opacity:.72}.chapter-card.locked:hover{transform:none;border-color:var(--line)}.chapter-card-top{display:flex;align-items:center;justify-content:space-between;gap:8px}.chapter-card-index{font-size:10px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}.chapter-card-title{margin:0 0 8px;font-size:14px;font-weight:700;line-height:1.35;color:var(--ink);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:2.7em}.chapter-card-locked{margin:-4px 0 6px;font-size:11px;font-weight:600;color:var(--muted)}.chapter-card-progress{display:flex;align-items:center;gap:10px;margin-top:2px}.chapter-card-progress-bar{flex:1;height:5px;border-radius:999px;background:var(--line);overflow:hidden}.chapter-card-progress-bar span{display:block;height:100%;border-radius:inherit;background:var(--primary);transition:width .25s ease}.chapter-card.status-mastered .chapter-card-progress-bar span{background:var(--green)}.chapter-card.status-in_progress .chapter-card-progress-bar span{background:var(--amber)}.chapter-card-pct{font-size:11px;font-weight:700;color:var(--muted);min-width:32px;text-align:right}.course-loading{text-align:center;padding:36px 24px;color:var(--muted)}.linkish{background:none;border:none;cursor:pointer;color:var(--primary);font-weight:600;font:inherit}.chapter-row.locked{opacity:.72}.chapter-row.locked .chapter-action{color:var(--muted);font-size:12px}.dash-grid{grid-template-columns:1.4fr 1fr}.dash-grid-3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}.kpi.clickable{cursor:pointer}.kpi.clickable:hover{box-shadow:var(--shadow)}.weakest-name{font-size:20px;margin-top:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.welcome-card{background:var(--welcome-card-bg);border-color:var(--hero-card-border)}.continue-card{display:flex;flex-direction:column;justify-content:center;background:var(--welcome-card-bg);border-color:var(--hero-card-border)}.subject-rings{gap:10px;flex-wrap:wrap}.subject-grid.compact{grid-template-columns:1fr}@media (max-width: 900px){.dash-grid{grid-template-columns:1fr}}.welcome-card{max-width:440px}.welcome-hero-copy h2{margin:0 0 10px;font-size:clamp(1.35rem,3vw,1.7rem);line-height:1.25}.welcome-hero-copy p{margin:0 0 20px;color:var(--muted, #5a6a7a);font-size:14.5px;line-height:1.55}.welcome-form{display:flex;flex-direction:column;gap:14px}.welcome-field{display:flex;flex-direction:column;gap:6px;margin:0;border:none;padding:0;font-size:13.5px;font-weight:600;color:var(--ink, #1a2330)}.welcome-field input,.welcome-field select{font:inherit;font-weight:500;padding:11px 12px;border-radius:10px;border:1px solid var(--line, #d8e0e8);background:#fff;color:inherit}.welcome-hint{margin:0;font-weight:500;font-size:12.5px;color:var(--muted, #5a6a7a)}.welcome-birthday-row{display:grid;grid-template-columns:1.4fr .8fr;gap:8px}.welcome-gender-row{display:grid;grid-template-columns:1fr 1fr;gap:8px}.welcome-choice{display:flex;align-items:center;justify-content:center;gap:8px;padding:11px 10px;border-radius:10px;border:1px solid var(--line, #d8e0e8);font-weight:600;cursor:pointer;background:#fff}.welcome-choice input{accent-color:#2a8f7a}.welcome-choice.selected{border-color:#2a8f7a;background:#e8f6f2;color:#1f6b5c}.contact-page .contact-card{max-width:520px}.contact-title{margin:0 0 6px;font-size:1.5rem;letter-spacing:-.02em}.contact-lead{margin:0 0 20px;font-size:14px;line-height:1.5}.contact-select{width:100%;padding:12px 40px 12px 14px;border:1px solid var(--line);border-radius:12px;font-family:inherit;font-size:16px;color:var(--ink);background:var(--surface);cursor:pointer;-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%236b7280' d='M1.2 1.2 6 6l4.8-4.8'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center}.contact-select:focus{outline:none;border-color:#6366f173;box-shadow:0 0 0 3px #6366f11f}.contact-textarea{width:100%;min-height:140px;padding:12px 14px;border:1px solid var(--line);border-radius:12px;font-family:inherit;font-size:16px;line-height:1.55;color:var(--ink);background:var(--surface);resize:vertical}.contact-textarea:focus{outline:none;border-color:#6366f173;box-shadow:0 0 0 3px #6366f11f}.contact-field-locked{background:var(--surface-2);color:var(--ink);cursor:default}.contact-field-locked:focus{outline:none;border-color:var(--line);box-shadow:none}.contact-success{display:flex;flex-direction:column;gap:16px;padding:18px 16px;border-radius:14px;background:#10b98114;border:1px solid rgba(16,185,129,.2)}.contact-success p{margin:0;font-size:14px;line-height:1.6;color:var(--ink);text-align:center}[data-theme=dark] .topbar{background:var(--topbar-bg);border-bottom-color:var(--line)}[data-theme=dark] .topbar h1{background:linear-gradient(135deg,#c7d2fe,#e9d5ff 55%,#ddd6fe);-webkit-background-clip:text;background-clip:text}[data-theme=dark] .btn.ghost:hover{background:var(--hover-surface)}[data-theme=dark] .field input,[data-theme=dark] .count-input,[data-theme=dark] .tutor-select,[data-theme=dark] .tutor-input{background:var(--input-bg);color:var(--ink);border-color:var(--line)}[data-theme=dark] .field input::placeholder,[data-theme=dark] .tutor-input::placeholder{color:var(--ink-faint)}[data-theme=dark] .pill.amber{color:var(--pill-amber-text)}[data-theme=dark] .pill.violet{color:var(--primary-600)}[data-theme=dark] .projection-card{background:var(--projection-bg)}[data-theme=dark] .mobile-tabbar{box-shadow:0 -4px 20px #00000059}[data-theme=dark] .mobile-tab.active{color:var(--primary)}[data-theme=dark] .passage{border-color:var(--filter-border)}[data-theme=dark] .tutor-warn{color:var(--tutor-warn-text)}[data-theme=dark] .profile-overlay{background:#0000008c}[data-theme=dark] .profile-panel{box-shadow:0 24px 60px -20px #000000a6}[data-theme=dark] .theme-slider-thumb{background:#eef0f8;box-shadow:0 2px 8px #00000073}[data-theme=dark] .qn.cur{box-shadow:0 0 0 3px #818cf838}[data-theme=dark] .stat-tile:hover,[data-theme=dark] .progress-kpi:hover,[data-theme=dark] .insight-tile.clickable:hover{box-shadow:var(--shadow-hover)}[data-theme=dark] .quick-card:hover{border-color:var(--accent-border);box-shadow:0 8px 24px -16px #00000080}[data-theme=dark] .progress-peer-tile:not(.static):hover{border-color:var(--accent-border);box-shadow:0 10px 24px -16px #00000073}[data-theme=dark] .progress-breakdown-row.clickable:hover{background:var(--hover-tint);border-color:var(--accent-border)}[data-theme=dark] .session-row:hover{background:var(--hover-tint)}[data-theme=dark] .session-row.selected{background:var(--hover-tint-strong)}[data-theme=dark] .chapter-row:hover{background:var(--hover-tint)}[data-theme=dark] .status-dot.not_started{box-shadow:0 0 0 2px var(--surface-2)}[data-theme=dark] .status-dot.in_progress{box-shadow:0 0 0 2px #f59e0b40}[data-theme=dark] .status-dot.mastered{box-shadow:0 0 0 2px #4ade8040}[data-theme=dark] .flagbtn.on{color:var(--pill-amber-text);border-color:#f59e0b73}[data-theme=dark] .feedback-mistake{border-color:#f8717159}[data-theme=dark] .concepts-head{background:linear-gradient(135deg,var(--surface) 0%,var(--surface-2) 100%);border-color:var(--line)}[data-theme=dark] .concepts-badge{background:var(--primary-soft);border-color:var(--filter-border);color:var(--primary-600)}[data-theme=dark] .concepts-nav{background:linear-gradient(180deg,var(--surface) 0%,var(--surface-2) 100%);border-color:var(--line)}[data-theme=dark] .concepts-nav:hover:not(:disabled){background:var(--hover-surface);border-color:var(--accent-border);box-shadow:0 8px 24px #00000059}[data-theme=dark] .concept-viewport{background:linear-gradient(165deg,#252b5273,#1e243959 45%,#161b2e8c);border-color:var(--line);box-shadow:inset 0 1px #ffffff0a,0 16px 40px -28px #00000073}[data-theme=dark] .concept-card,[data-theme=dark] .concept-card:nth-child(3n+2),[data-theme=dark] .concept-card:nth-child(3n){background:linear-gradient(155deg,var(--surface) 0%,var(--surface-2) 55%,#1a2038 100%);border-color:var(--line);box-shadow:0 4px 16px #00000040,inset 0 1px #ffffff0a}[data-theme=dark] .concept-card:hover{border-color:var(--accent-border);box-shadow:0 10px 28px #00000059,inset 0 1px #ffffff0d}[data-theme=dark] .mm-bg{fill:var(--surface-2)}[data-theme=dark] .mm-line--base{stroke:var(--line)}[data-theme=dark] .mm-spoke-circle--neutral{fill:var(--surface);stroke:var(--line)}[data-theme=dark] .mm-spoke-circle--light{fill:#f8717133;stroke:var(--red)}[data-theme=dark] .mm-spoke-circle--dark{fill:#f8717159;stroke:#fca5a5}[data-theme=dark] .mm-spoke-circle--good{fill:#4ade8033;stroke:var(--green)}[data-theme=dark] .mm-hub-label{fill:#fff}[data-theme=dark] .mm-hub-sub{fill:#ffffffe0}[data-theme=dark] .mm-spoke-label{fill:var(--ink)}[data-theme=dark] .mm-spoke-inner--dark,[data-theme=dark] .mm-spoke-inner--light{fill:#fecaca}[data-theme=dark] .mm-spoke-inner--good{fill:#86efac}[data-theme=dark] .mm-spoke-inner--neutral{fill:var(--ink-soft)}[data-theme=dark] .auth-card{background:#161b2ef0;border-color:var(--line);box-shadow:0 24px 60px -24px #0000008c;color:var(--ink)}[data-theme=dark] .auth-card h2{color:var(--ink)}[data-theme=dark] .auth-tab.active{background:var(--surface);color:var(--primary);box-shadow:0 2px 8px #00000040}[data-theme=dark] .auth-form .field input{background:var(--input-bg);color:var(--ink)}:root{color-scheme:light;--bg: #f4f6fc;--surface: #ffffff;--surface-2: #f0f2fb;--ink: #1c2140;--ink-soft: #5b6180;--ink-faint: #9aa0bd;--line: #e6e8f5;--topbar-bg: rgba(255, 255, 255, .92);--input-bg: #ffffff;--hover-surface: #e6e8f5;--hover-tint: rgba(99, 102, 241, .06);--hover-tint-strong: rgba(99, 102, 241, .1);--accent-border: #c7d2fe;--filter-border: #d9d6fe;--tile-base: #ffffff;--tile-explored: linear-gradient(160deg, #eef2ff 0%, #fff 70%);--tile-in-progress: linear-gradient(160deg, #fef3c7 0%, #fff 70%);--tile-pending: linear-gradient(160deg, #ecfdf5 0%, #fff 70%);--tile-accuracy: linear-gradient(160deg, #f0f9ff 0%, #fff 70%);--tile-streak: linear-gradient(160deg, #fff1f2 0%, #fff 70%);--kpi-score: linear-gradient(160deg, #f0f9ff 0%, #fff 65%);--kpi-time: linear-gradient(160deg, #fef3c7 0%, #fff 65%);--kpi-sessions: linear-gradient(160deg, #ede9fe 0%, #fff 65%);--kpi-chapters: linear-gradient(160deg, #ecfdf5 0%, #fff 65%);--hero-card-bg: linear-gradient(135deg, #ede9fe 0%, #f8f7ff 42%, #fff 100%);--hero-card-border: #d9d6fe;--welcome-card-bg: linear-gradient(135deg, #ecebff 0%, #f8f7ff 45%, #fff 100%);--subject-head-bg: rgba(248, 247, 255, .6);--hero-stat-bg: rgba(255, 255, 255, .85);--encourage-bg: linear-gradient(135deg, #ede9fe 0%, #f0fdf4 100%);--projection-bg: linear-gradient(135deg, #fff3d6, #fff);--mistake-head-bg: linear-gradient(135deg, rgba(237, 233, 254, .5) 0%, rgba(255, 255, 255, .9) 100%);--mistake-concept-bg: linear-gradient(180deg, rgba(248, 247, 255, .6) 0%, rgba(255, 255, 255, 0) 100%);--rank-high-bg: #dcfce7;--rank-high-text: #15803d;--rank-grow-bg: #fef3c7;--rank-grow-text: #b45309;--badge-earned-bg: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);--badge-earned-border: #fbbf24;--badge-earned-text: #92400e;--badge-card-earned-bg: linear-gradient(160deg, #fffbeb 0%, #fff 70%);--wow-delta-text: #b45309;--pill-amber-text: #b45309;--tutor-warn-text: #b45309;--opt-key-hover: #ffffff;--hero-from: #4338ca;--hero-mid: #6d28d9;--hero-to: #7c3aed;--hero-gradient: linear-gradient(135deg, var(--hero-from) 0%, var(--hero-mid) 55%, var(--hero-to) 100%);--hero-mesh: radial-gradient(600px 320px at 85% 15%, rgba(255, 255, 255, .14), transparent 60%), radial-gradient(500px 280px at 5% 80%, rgba(245, 158, 11, .12), transparent 55%), url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");--page-bg: radial-gradient(1100px 520px at 12% -8%, #e9edff 0%, rgba(233, 237, 255, 0) 60%), radial-gradient(900px 500px at 108% 10%, #efe9ff 0%, rgba(239, 233, 255, 0) 55%), linear-gradient(180deg, #f4f6fc 0%, #eceff7 100%);--primary: #6366f1;--primary-600: #4338ca;--primary-soft: #ecebff;--violet: #7c3aed;--pink: #f472b6;--amber: #f59e0b;--amber-soft: #fff3d6;--green: #16a34a;--green-soft: #dcfce7;--red: #ef4444;--red-soft: #fee2e2;--cyan: #06b6d4;--mint: #14b8a6;--sky: #0ea5e9;--coral: #f43f5e;--sun: #f59e0b;--sun2: #f97316;--radius: 18px;--radius-sm: 12px;--shadow: 0 10px 30px rgba(30, 34, 90, .08);--shadow-sm: 0 4px 14px rgba(30, 34, 90, .06);--shadow-hover: 0 12px 28px -18px rgba(30, 34, 90, .45);--shadow-hero: 0 24px 50px -24px rgba(67, 56, 202, .45);--font: "Poppins", "Segoe UI", system-ui, -apple-system, sans-serif;--panel: var(--surface);--muted: var(--ink-soft);--faint: var(--ink-faint);--brand: var(--primary);--brand2: var(--violet);--brand-700: var(--hero-from);--brand-50: var(--primary-soft);--ok: var(--green);--bad: var(--red);--r-sm: var(--radius-sm);--r-lg: var(--radius);--sh-sm: var(--shadow-sm);--sh: var(--shadow);--navy: #0f172a}[data-theme=dark]{color-scheme:dark;--bg: #0c0f1a;--surface: #161b2e;--surface-2: #1e2439;--ink: #eef0f8;--ink-soft: #b4bcd8;--ink-faint: #7d86a8;--line: #2a3149;--topbar-bg: rgba(22, 27, 46, .94);--input-bg: #1a2035;--hover-surface: #252b44;--hover-tint: rgba(129, 140, 248, .1);--hover-tint-strong: rgba(129, 140, 248, .16);--accent-border: #3d4580;--filter-border: #3d4580;--tile-base: #1a2035;--tile-explored: linear-gradient(160deg, #1e2648 0%, #161b2e 70%);--tile-in-progress: linear-gradient(160deg, #2a2418 0%, #161b2e 70%);--tile-pending: linear-gradient(160deg, #142a22 0%, #161b2e 70%);--tile-accuracy: linear-gradient(160deg, #152238 0%, #161b2e 70%);--tile-streak: linear-gradient(160deg, #2a1820 0%, #161b2e 70%);--kpi-score: linear-gradient(160deg, #152238 0%, #161b2e 65%);--kpi-time: linear-gradient(160deg, #2a2418 0%, #161b2e 65%);--kpi-sessions: linear-gradient(160deg, #221e42 0%, #161b2e 65%);--kpi-chapters: linear-gradient(160deg, #142a22 0%, #161b2e 65%);--hero-card-bg: linear-gradient(135deg, #1e1a3a 0%, #181d32 42%, #161b2e 100%);--hero-card-border: #3d4580;--welcome-card-bg: linear-gradient(135deg, #1e1c38 0%, #181d32 45%, #161b2e 100%);--subject-head-bg: rgba(30, 36, 57, .85);--hero-stat-bg: rgba(26, 32, 53, .9);--encourage-bg: linear-gradient(135deg, #1e1a3a 0%, #142a22 100%);--projection-bg: linear-gradient(135deg, #2a2418, #161b2e);--mistake-head-bg: linear-gradient(135deg, rgba(46, 40, 80, .6) 0%, rgba(22, 27, 46, .95) 100%);--mistake-concept-bg: linear-gradient(180deg, rgba(30, 36, 57, .7) 0%, rgba(22, 27, 46, 0) 100%);--rank-high-bg: rgba(34, 197, 94, .18);--rank-high-text: #4ade80;--rank-grow-bg: rgba(245, 158, 11, .18);--rank-grow-text: #fbbf24;--badge-earned-bg: linear-gradient(135deg, #3d3018 0%, #2a2410 100%);--badge-earned-border: #b45309;--badge-earned-text: #fcd34d;--badge-card-earned-bg: linear-gradient(160deg, #2a2418 0%, #161b2e 70%);--wow-delta-text: #fbbf24;--pill-amber-text: #fbbf24;--tutor-warn-text: #fbbf24;--opt-key-hover: #252b44;--page-bg: radial-gradient(1100px 520px at 12% -8%, #1a1f42 0%, rgba(26, 31, 66, 0) 60%), radial-gradient(900px 500px at 108% 10%, #1e1842 0%, rgba(30, 24, 66, 0) 55%), linear-gradient(180deg, #0c0f1a 0%, #101425 100%);--primary: #818cf8;--primary-600: #a5b4fc;--primary-soft: #252b52;--amber-soft: rgba(245, 158, 11, .16);--green: #4ade80;--green-soft: rgba(34, 197, 94, .16);--red: #f87171;--red-soft: rgba(248, 113, 113, .16);--shadow: 0 10px 30px rgba(0, 0, 0, .45);--shadow-sm: 0 4px 14px rgba(0, 0, 0, .35);--shadow-hover: 0 12px 28px -18px rgba(0, 0, 0, .55);--shadow-hero: 0 24px 50px -24px rgba(0, 0, 0, .6)}:root{--brand-word-size: 20px;--brand-tag-size: 11px;--brand-icon-h: 40px;--brand-mark-gap: 10px}.brand-mark{display:flex;align-items:center;gap:var(--brand-mark-gap);min-width:0}.brand-mark-icon{height:var(--brand-icon-h);width:auto;object-fit:contain;flex-shrink:0;display:block}.brand-mark-text{min-width:0;line-height:1.1}.brand-wordmark{display:inline-flex;align-items:baseline;font-size:var(--brand-word-size);font-weight:700;letter-spacing:-.02em;line-height:1;font-family:var(--font)}.brand-word-smart{color:#5b21b6}.brand-word-revise{background:linear-gradient(90deg,#22c55e,#14b8a6);-webkit-background-clip:text;background-clip:text;color:transparent}.brand-mark-tag{display:block;font-size:var(--brand-tag-size);font-weight:500;color:var(--ink-faint);margin-top:3px;letter-spacing:.2px;font-family:var(--font)}.brand-mark--stacked{flex-direction:column;align-items:center;text-align:center;gap:12px}.brand-mark--stacked .brand-mark-text{display:flex;flex-direction:column;align-items:center}.brand-mark--dark .brand-word-smart{color:#fff}.brand-mark--dark .brand-word-revise{background:none;color:#bbf7d0;-webkit-background-clip:unset;background-clip:unset}.brand-mark--dark .brand-mark-tag{color:#ffffffd9}.brand-mark--dark .brand-mark-icon{filter:drop-shadow(0 2px 6px rgba(0,0,0,.12))}.sidebar .brand{padding:4px 6px 20px}.sidebar .brand-mark{width:100%}.hero-surface{position:relative;overflow:hidden;background:var(--hero-gradient);color:#fff}.hero-surface-mesh{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;background:var(--hero-mesh)}.hero-surface-inner{position:relative;z-index:1}.login-hero-brand{margin-bottom:auto;padding-top:4px}.lp-foot-block .brand-mark{justify-content:center}.hidden{display:none!important}*{box-sizing:border-box}html,body{height:100%}body{margin:0;font-family:var(--font);background:var(--page-bg);background-attachment:fixed;color:var(--ink);-webkit-font-smoothing:antialiased;font-size:14px}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer;border:none;background:none}.route-fallback{padding:48px 24px;text-align:center;font-size:14px}.app{display:flex;min-height:100vh;min-height:100dvh}.sidebar{width:248px;flex-shrink:0;background:var(--hero-gradient);color:#fff;padding:22px 16px;display:flex;flex-direction:column;position:sticky;top:0;height:100vh;height:100dvh;box-shadow:4px 0 24px #4338ca1f}.brand{display:flex;align-items:center;gap:10px;padding:6px 8px 22px}.nav{display:flex;flex-direction:column;gap:4px;margin-top:6px}.nav a,.nav button.navlink{display:flex;align-items:center;gap:12px;padding:11px 13px;border-radius:12px;color:#c3c6ef;font-weight:500;transition:.15s;font-size:13.5px;width:100%;text-align:left}.nav a .ic,.nav button.navlink .ic{width:20px;text-align:center;font-size:16px}.nav a:hover,.nav button.navlink:hover{background:#ffffff14;color:#fff}.nav a.active,.nav button.navlink.active{background:#fff3;color:#fff;box-shadow:inset 0 0 0 1px #ffffff26}.nav-spacer{flex:1}.side-card{margin-top:14px;background:#ffffff17;border-radius:14px;padding:14px;font-size:12px;color:#d7d9f5}.side-card b{color:#fff}.main{flex:1;min-width:0;display:flex;flex-direction:column}.topbar{height:66px;background:var(--topbar-bg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);display:flex;align-items:center;gap:14px;padding:0 26px;position:sticky;top:0;z-index:20}.topbar h1{font-size:18px;font-weight:600;margin:0;background:var(--hero-gradient);-webkit-background-clip:text;background-clip:text;color:transparent}.topbar-brand{display:none}.topbar-titles{min-width:0}.topbar .sub{color:var(--ink-faint);font-size:12px;font-weight:400}.topbar-right{margin-left:auto;display:flex;align-items:center;gap:14px}.icon-btn{width:44px;height:44px;border-radius:11px;background:var(--surface-2);display:grid;place-items:center;font-size:16px;position:relative}.avatar{display:flex;align-items:center;gap:9px}.profile-trigger{border:none;background:none;cursor:pointer;font-family:inherit;color:inherit;padding:4px 6px;border-radius:12px;transition:background .15s}.profile-trigger:hover{background:var(--surface-2)}.avatar .pic{width:38px;height:38px;border-radius:11px;background:var(--hero-gradient);display:grid;place-items:center;color:#fff;font-weight:700}.avatar small{display:block;color:var(--ink-faint);font-size:11px}.content{padding:26px;flex:1}.grid{display:grid;gap:18px}.card{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow-sm);padding:20px;border:1px solid var(--line)}.card h3{font-size:15px;margin-bottom:4px}.card .muted{color:var(--ink-faint);font-size:12px}.card-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.kpis{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px;margin-bottom:20px}.kpi{background:var(--surface);border-radius:var(--radius);padding:16px 18px;box-shadow:var(--shadow-sm);border:1px solid var(--line);position:relative;overflow:hidden}.kpi .label{color:var(--ink-faint);font-size:12px;display:flex;align-items:center;gap:6px}.kpi .value{font-size:28px;font-weight:700;margin-top:6px;letter-spacing:-.5px}.kpi .delta{font-size:12px;font-weight:600;margin-top:3px}.kpi .delta.up{color:var(--green)}.kpi .delta.down{color:var(--red)}.kpi .glow{position:absolute;right:-20px;top:-20px;width:80px;height:80px;border-radius:50%;opacity:.13}.pill{display:inline-flex;align-items:center;gap:6px;padding:5px 11px;border-radius:999px;font-size:11.5px;font-weight:600}.pill.green{background:var(--green-soft);color:var(--green)}.pill.amber{background:var(--amber-soft);color:var(--pill-amber-text)}.pill.red{background:var(--red-soft);color:var(--red)}.pill.violet{background:var(--primary-soft);color:var(--primary-600)}.pill.gray{background:var(--surface-2);color:var(--ink-soft)}.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 16px;border-radius:12px;font-weight:600;font-size:13px;transition:.15s}.btn.primary{background:var(--hero-gradient);color:#fff;box-shadow:0 8px 18px -8px #4338ca8c}.btn.primary:hover{filter:brightness(1.05)}.btn.ghost{background:var(--surface-2);color:var(--ink)}.btn.ghost:hover{background:var(--hover-surface)}.btn.outline{background:transparent;border:1.5px solid var(--line);color:var(--ink)}.btn.sm{padding:7px 12px;font-size:12px;border-radius:10px}.btn.block{width:100%;justify-content:center}.btn:disabled{opacity:.5;cursor:default}.bar{height:8px;background:var(--surface-2);border-radius:999px;overflow:hidden}.bar>span{display:block;height:100%;border-radius:999px;background:var(--hero-gradient)}.bar.green>span{background:linear-gradient(90deg,#22c55e,#16a34a)}.bar.amber>span{background:linear-gradient(90deg,#fbbf24,#f59e0b)}.bar.red>span{background:linear-gradient(90deg,#f87171,#ef4444)}.ring{--p: 60;--c: var(--hero-from);width:72px;height:72px;border-radius:50%;background:conic-gradient(var(--c) calc(var(--p) * 1%),var(--surface-2) 0);display:grid;place-items:center;position:relative}.ring b{width:54px;height:54px;background:var(--surface);border-radius:50%;display:grid;place-items:center;font-size:14px}.row{display:flex;align-items:center;gap:14px;padding:14px 0;border-bottom:1px solid var(--line)}.row:last-child{border-bottom:none}.row .grow{flex:1;min-width:0}.row .rank{width:28px;height:28px;border-radius:9px;background:var(--primary-soft);color:var(--primary-600);font-weight:700;display:grid;place-items:center;font-size:13px}table{width:100%;border-collapse:collapse;font-size:13px}th{text-align:left;color:var(--ink-faint);font-weight:600;font-size:11.5px;text-transform:uppercase;letter-spacing:.4px;padding:10px 12px;border-bottom:1px solid var(--line)}td{padding:12px;border-bottom:1px solid var(--line)}tr:hover td{background:var(--surface-2)}.subject-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:16px}.subject{display:flex;align-items:center;gap:14px;cursor:pointer;transition:.15s}.subject:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.subject .emoji{width:52px;height:52px;border-radius:14px;display:grid;place-items:center;font-size:26px}.flex{display:flex}.between{justify-content:space-between}.center{align-items:center}.gap{gap:12px}.wrap{flex-wrap:wrap}.mt{margin-top:18px}.mt-s{margin-top:10px}.mb{margin-bottom:16px}.tag{font-size:11px;color:var(--ink-faint)}.crumbs{display:flex;align-items:center;gap:8px;color:var(--ink-faint);font-size:13px;margin-bottom:16px}.crumbs b{color:var(--ink)}.chip{padding:7px 13px;border-radius:999px;background:var(--surface-2);font-size:12.5px;font-weight:600;cursor:pointer}.chip.on{background:var(--primary);color:#fff}.field{margin:14px 0;text-align:left}.field label{font-size:12px;color:var(--ink-soft);font-weight:600;display:block;margin-bottom:6px}.field input{width:100%;padding:13px 14px;border:1.5px solid var(--line);border-radius:12px;font-family:inherit;font-size:16px;outline:none;background:var(--input-bg);color:var(--ink)}.field input:focus{border-color:var(--primary)}.empty-state{text-align:center;padding:40px 20px;color:var(--ink-faint)}.empty-state p{margin-top:8px;font-size:13px}.improve-grid{grid-template-columns:1.5fr 1fr;align-items:start}.improve-side{align-content:start}.projection-card{background:var(--projection-bg)}.mobile-tabbar{display:none;position:fixed;bottom:0;left:0;right:0;z-index:100;background:var(--surface);border-top:1px solid var(--line);padding:6px 8px calc(6px + env(safe-area-inset-bottom,0px));box-shadow:0 -4px 20px #1e225a14}.mobile-tab{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;padding:6px 4px;border-radius:10px;color:var(--ink-faint);font-size:10px;font-weight:600;text-decoration:none;min-width:0}.mobile-tab .ic{font-size:20px;line-height:1}.mobile-tab .lbl{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%}.mobile-tab.active{color:var(--hero-from);background:var(--primary-soft)}.mobile-logout{display:none;width:44px;height:44px;border-radius:10px;background:var(--surface-2);font-size:16px;flex-shrink:0}.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:0 -4px;padding:0 4px}@media (max-width: 900px){.sidebar{display:none}.mobile-tabbar{display:flex}.mobile-logout{display:grid;place-items:center}.main{padding-bottom:calc(64px + env(safe-area-inset-bottom,0px))}.main.main-session{padding-bottom:0}.content{padding:16px}.content-session{padding:12px 14px!important}.topbar{height:auto;min-height:56px;padding:10px 14px;gap:10px}.topbar-brand{display:flex;flex-shrink:0}.topbar-brand .brand-mark-text,.topbar-titles .sub{display:none}.topbar h1{font-size:16px;max-width:none}.avatar-text{display:none}.card-head{flex-wrap:wrap;gap:8px;align-items:flex-start}.improve-grid{grid-template-columns:1fr}.row{flex-wrap:wrap;gap:10px}.row .btn{width:100%;justify-content:center}.kpis{grid-template-columns:repeat(2,1fr);gap:10px}.kpi .value{font-size:22px}.crumbs{flex-wrap:wrap;font-size:12px}}@media (max-width: 480px){.kpis{grid-template-columns:1fr}.topbar h1{font-size:15px;max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}}