@import "https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Sans:wght@300;400;500&display=swap";@import "https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Sans:wght@300;400;500&display=swap";@import "https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Sans:wght@300;400;500&display=swap";:root{--bg:#fff;--bg-surface:#f5f5f5;--bg-card:#fff;--border:#00000014;--text-primary:#1a1a1a;--text-secondary:#888;--text-muted:#aaa;--accent:#185fa5;--accent-soft:#378add;--accent-bg:#e6f1fb;--accent-text:#0c447c;--brand:#0c447c}[data-theme=dark]{--bg:#0f1117;--bg-surface:#181c27;--bg-card:#181c27;--border:#ffffff14;--text-primary:#f0f0f0;--text-secondary:#888;--text-muted:#555;--accent:#185fa5;--accent-soft:#378add;--accent-bg:#378add26;--accent-text:#85b7eb;--brand:#85b7eb}.hp{background:var(--bg);color:var(--text-primary);min-height:100vh;font-family:DM Sans,sans-serif;transition:background .2s,color .2s}.hp-nav{border-bottom:.5px solid var(--border);justify-content:space-between;align-items:center;padding:20px 40px;display:flex}.hp-brand{color:var(--brand);font-family:DM Serif Display,serif;font-size:20px}.hp-nav-links{align-items:center;gap:24px;display:flex}.hp-nav-link{color:var(--text-secondary);font-size:13px;text-decoration:none}.hp-nav-link:hover{color:var(--text-primary)}.hp-theme-toggle{border:.5px solid var(--border);cursor:pointer;width:32px;height:32px;color:var(--text-secondary);background:0 0;border-radius:8px;justify-content:center;align-items:center;font-size:14px;transition:background .15s;display:flex}.hp-theme-toggle:hover{background:var(--bg-surface)}.hp-nav-btn{background:var(--accent);color:#e6f1fb;cursor:pointer;border:none;border-radius:8px;padding:8px 18px;font-family:DM Sans,sans-serif;font-size:13px;font-weight:500;text-decoration:none}.hp-nav-btn:hover{background:var(--accent-soft)}.hp-hero{text-align:center;border-bottom:.5px solid var(--border);padding:80px 40px 64px}.hp-eyebrow{letter-spacing:1px;text-transform:uppercase;color:var(--accent-soft);margin-bottom:16px;font-size:11px;font-weight:500}.hp-title{color:var(--text-primary);letter-spacing:-.5px;max-width:560px;margin:0 auto 16px;font-family:DM Serif Display,serif;font-size:44px;font-weight:400;line-height:1.15}.hp-title em{color:var(--accent-text);font-style:italic}.hp-sub{color:var(--text-secondary);max-width:420px;margin:0 auto 36px;font-size:15px;font-weight:300;line-height:1.6}.hp-actions{justify-content:center;align-items:center;gap:12px;display:flex}.btn-hero{background:var(--accent);color:#e6f1fb;cursor:pointer;border:none;border-radius:8px;padding:12px 28px;font-family:DM Sans,sans-serif;font-size:14px;font-weight:500;text-decoration:none;transition:background .15s}.btn-hero:hover{background:var(--accent-soft)}.btn-ghost{color:var(--text-secondary);border:.5px solid var(--border);cursor:pointer;background:0 0;border-radius:8px;padding:12px 24px;font-family:DM Sans,sans-serif;font-size:14px;text-decoration:none;transition:background .15s,color .15s}.btn-ghost:hover{background:var(--bg-surface);color:var(--text-primary)}.hp-steps{border-bottom:.5px solid var(--border);padding:56px 40px}.hp-section-label{letter-spacing:1px;text-transform:uppercase;color:var(--text-muted);text-align:center;margin-bottom:32px;font-size:11px;font-weight:500}.hp-steps-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;display:grid}.hp-step-card{background:var(--bg-card);border:.5px solid var(--border);border-radius:12px;padding:24px;transition:background .2s}.hp-step-num{color:var(--accent-soft);letter-spacing:.5px;margin-bottom:12px;font-size:11px;font-weight:500}.hp-step-title{color:var(--text-primary);margin-bottom:6px;font-size:15px;font-weight:500}.hp-step-desc{color:var(--text-secondary);font-size:13px;font-weight:300;line-height:1.5}.hp-problem{border-bottom:.5px solid var(--border);padding:56px 40px}.hp-problem-inner{grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:center;gap:48px;display:grid}.hp-problem-title{color:var(--text-primary);letter-spacing:-.3px;margin:0 0 14px;font-family:DM Serif Display,serif;font-size:28px;font-weight:400;line-height:1.25}.hp-problem-title em{color:var(--accent-text);font-style:italic}.hp-problem-desc{color:var(--text-secondary);margin:0;font-size:14px;font-weight:300;line-height:1.65}.hp-features{flex-direction:column;gap:12px;display:flex}.hp-feature{background:var(--bg-card);border:.5px solid var(--border);border-radius:10px;align-items:flex-start;gap:14px;padding:16px;transition:background .2s;display:flex}.hp-feature-icon{color:var(--accent-soft);text-align:center;flex-shrink:0;width:24px;margin-top:1px;font-size:18px}.hp-feature-title{color:var(--text-primary);margin-bottom:4px;font-size:13px;font-weight:500}.hp-feature-desc{color:var(--text-secondary);font-size:12px;line-height:1.4}.hp-recent{padding:48px 40px}.hp-section-row{justify-content:space-between;align-items:center;margin-bottom:20px;display:flex}.hp-section-title{color:var(--text-primary);font-size:14px;font-weight:500}.hp-section-action{color:var(--accent-soft);font-size:12px;text-decoration:none}.hp-section-action:hover{text-decoration:underline}.hp-empty{text-align:center;border:.5px dashed var(--border);border-radius:12px;padding:40px}.hp-empty-title{color:var(--text-primary);margin-bottom:6px;font-size:14px;font-weight:500}.hp-empty-sub{color:var(--text-secondary);font-size:13px}@media (width<=640px){.hp-nav{padding:16px 20px}.hp-hero{padding:48px 20px}.hp-title{font-size:32px}.hp-steps{padding:40px 20px}.hp-steps-grid{grid-template-columns:1fr}.hp-problem{padding:40px 20px}.hp-problem-inner{grid-template-columns:1fr;gap:32px}.hp-recent{padding:40px 20px}}:root{--bg:#fff;--bg-surface:#f5f5f5;--bg-card:#fff;--border:#0000001a;--border-mid:#0000002e;--text-primary:#1a1a1a;--text-secondary:#888;--text-muted:#aaa;--accent:#185fa5;--accent-soft:#378add;--accent-bg:#e6f1fb;--accent-text:#0c447c;--brand:#0c447c;--panel-bg:#0c447c;--panel-brand:#b5d4f4;--panel-title:#e6f1fb;--panel-sub:#378add}[data-theme=dark]{--bg:#0f1117;--bg-surface:#181c27;--bg-card:#181c27;--border:#ffffff14;--border-mid:#ffffff26;--text-primary:#f0f0f0;--text-secondary:#888;--text-muted:#555;--accent:#185fa5;--accent-soft:#378add;--accent-bg:#378add26;--accent-text:#85b7eb;--brand:#85b7eb;--panel-bg:#0a0f1a;--panel-brand:#85b7eb;--panel-title:#e0eaf5;--panel-sub:#378add}.login-wrap{background:var(--bg);align-items:stretch;min-height:100vh;font-family:DM Sans,sans-serif;transition:background .2s;display:flex}.login-left{background:var(--panel-bg);flex-direction:column;flex:1;justify-content:space-between;min-width:260px;padding:48px 40px;display:flex;position:relative}.login-theme-toggle{cursor:pointer;width:32px;height:32px;color:var(--panel-brand);background:#ffffff1a;border:.5px solid #ffffff26;border-radius:8px;justify-content:center;align-items:center;font-size:14px;transition:background .15s;display:flex;position:absolute;top:20px;right:20px}.login-theme-toggle:hover{background:#ffffff26}.login-brand{color:var(--panel-brand);letter-spacing:-.3px;font-family:DM Serif Display,serif;font-size:22px}.login-tagline{color:var(--panel-title);margin-bottom:10px;font-family:DM Serif Display,serif;font-size:28px;font-style:italic;line-height:1.3}.login-sub{color:var(--panel-sub);font-size:13px;font-weight:300}.login-right{background:var(--bg);flex-direction:column;flex:1.2;justify-content:center;padding:64px 52px;transition:background .2s;display:flex}.login-heading{color:var(--text-primary);letter-spacing:-.3px;margin:0 0 6px;font-family:DM Serif Display,serif;font-size:26px;font-weight:400}.login-subheading{color:var(--text-secondary);margin:0 0 32px;font-size:13px;font-weight:300}.login-error{color:#a32d2d;background:#fcebeb;border:.5px solid #f09595;border-radius:8px;margin-bottom:18px;padding:10px 14px;font-size:13px}.field{flex-direction:column;gap:6px;margin-bottom:18px;display:flex}.field label{color:var(--text-secondary);letter-spacing:.5px;text-transform:uppercase;font-size:11px;font-weight:500}.field input{border:.5px solid var(--border-mid);background:var(--bg-surface);height:42px;color:var(--text-primary);border-radius:8px;outline:none;padding:0 14px;font-family:DM Sans,sans-serif;font-size:14px;transition:border-color .15s,box-shadow .15s,background .2s}.field input:focus{border-color:var(--accent-soft);background:var(--bg);box-shadow:0 0 0 3px #378add26}.forgot{color:var(--accent-soft);text-align:right;cursor:pointer;margin-top:-10px;margin-bottom:24px;font-size:12px}.forgot:hover{text-decoration:underline}.btn-primary{background:var(--accent);color:#e6f1fb;cursor:pointer;letter-spacing:.2px;border:none;border-radius:8px;width:100%;height:42px;font-family:DM Sans,sans-serif;font-size:14px;font-weight:500;transition:background .15s,transform .1s}.btn-primary:hover{background:var(--accent-soft)}.btn-primary:active{transform:scale(.98)}.btn-primary:disabled{cursor:not-allowed;background:#7aaed4}.divider{align-items:center;gap:12px;margin:20px 0;display:flex}.divider-line{background:var(--border-mid);flex:1;height:.5px}.divider span{color:var(--text-muted);font-size:12px}.btn-secondary{background:var(--bg-surface);width:100%;height:42px;color:var(--text-primary);border:.5px solid var(--border-mid);cursor:pointer;border-radius:8px;justify-content:center;align-items:center;gap:8px;font-family:DM Sans,sans-serif;font-size:14px;font-weight:400;transition:background .15s;display:flex}.btn-secondary:hover{background:var(--bg-card)}.signup-nudge{color:var(--text-secondary);text-align:center;margin-top:20px;font-size:12px}.signup-nudge a{color:var(--accent-soft);font-weight:500;text-decoration:none}.signup-nudge a:hover{text-decoration:underline}@media (width<=640px){.login-wrap{flex-direction:column}.login-left{min-width:unset;min-height:200px;padding:32px 24px}.login-right{padding:40px 24px}}:root{--bg:#0e0e11;--surface:#17171c;--surface-2:#1f1f27;--border:#2a2a35;--text:#e8e8f0;--text-muted:#6b6b80;--text-faint:#3d3d50;--accent:#7b6ef6;--accent-dim:#7b6ef620;--accent-hover:#9183f8;--danger:#e05252;--danger-dim:#e0525215;--radius:12px;--radius-sm:8px;--transition:.15s ease}[data-theme=light]{--bg:#f4f4f8;--surface:#fff;--surface-2:#f0f0f5;--border:#e0e0ea;--text:#1a1a2e;--text-muted:#6b6b80;--text-faint:#c0c0d0;--accent-dim:#7b6ef615;--danger-dim:#e0525210}.dash-wrap{background:var(--bg);min-height:100vh;color:var(--text);font-family:Inter,system-ui,sans-serif}.dash-header{border-bottom:1px solid var(--border);background:var(--bg);z-index:10;position:sticky;top:0}.dash-header-inner{justify-content:space-between;align-items:center;max-width:1100px;height:56px;margin:0 auto;padding:0 32px;display:flex}.dash-brand{letter-spacing:-.5px;color:var(--text);font-size:17px;font-weight:700}.dash-header-actions{align-items:center;gap:10px;display:flex}.dash-theme-btn{border-radius:var(--radius-sm);border:1px solid var(--border);width:34px;height:34px;color:var(--text-muted);cursor:pointer;transition:color var(--transition), border-color var(--transition);background:0 0;justify-content:center;align-items:center;display:flex}.dash-theme-btn:hover{color:var(--text);border-color:var(--text-faint)}.dash-signout-btn{color:var(--text-muted);border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;transition:color var(--transition), border-color var(--transition), background var(--transition);background:0 0;align-items:center;gap:6px;padding:7px 14px;font-size:13px;font-weight:500;display:inline-flex}.dash-signout-btn:hover{color:var(--danger);border-color:var(--danger);background:var(--danger-dim)}.dash-main{max-width:1100px;margin:0 auto;padding:48px 32px 80px}.dash-intro{margin-bottom:36px}.dash-title{letter-spacing:-.5px;color:var(--text);margin:0 0 6px;font-size:26px;font-weight:700}.dash-sub{color:var(--text-muted);margin:0;font-size:14px}.dash-error{background:var(--danger-dim);border:1px solid var(--danger);border-radius:var(--radius-sm);color:var(--danger);justify-content:space-between;align-items:center;gap:12px;margin-bottom:24px;padding:12px 16px;font-size:13px;display:flex}.dash-error-retry{border:1px solid var(--danger);color:var(--danger);cursor:pointer;white-space:nowrap;transition:background var(--transition);background:0 0;border-radius:6px;padding:4px 12px;font-size:12px}.dash-error-retry:hover{background:var(--danger-dim)}.dash-grid,.dash-skeleton-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;display:grid}.dash-skeleton-card{border-radius:var(--radius);background:var(--surface);border:1px solid var(--border);height:160px;animation:1.4s ease-in-out infinite dash-pulse}@keyframes dash-pulse{0%,to{opacity:1}50%{opacity:.4}}.dash-card{border-radius:var(--radius);border:1px solid var(--border);background:var(--surface);text-align:left;transition:border-color var(--transition), background var(--transition), transform var(--transition);flex-direction:column;gap:0;min-height:160px;padding:20px;display:flex;position:relative}.dash-card--session:hover{border-color:var(--accent);background:var(--surface-2);transform:translateY(-1px)}.dash-card.is-deleting{opacity:.5;pointer-events:none}.dash-card--new{color:var(--text-muted);cursor:pointer;background:0 0;border-style:dashed;justify-content:center;align-items:center;gap:10px;font-size:14px;font-weight:500}.dash-card--new:hover:not(:disabled){color:var(--accent);border-color:var(--accent);background:var(--accent-dim)}.dash-card-new-icon{color:inherit}.dash-card-link{color:inherit;flex-direction:column;flex:1;text-decoration:none;display:flex}.dash-card-top{align-items:flex-start;margin-bottom:14px;display:flex}.dash-card-icon{border-radius:var(--radius-sm);background:var(--accent-dim);width:32px;height:32px;color:var(--accent);flex-shrink:0;justify-content:center;align-items:center;display:flex}.dash-card-delete{z-index:2;width:28px;height:28px;color:var(--text-faint);cursor:pointer;transition:color var(--transition), background var(--transition);opacity:0;background:0 0;border:none;border-radius:6px;justify-content:center;align-items:center;display:flex;position:absolute;top:20px;right:20px}.dash-card--session:hover .dash-card-delete{opacity:1}.dash-card-delete:hover{color:var(--danger);background:var(--danger-dim)}.dash-card-body{flex:1}.dash-card-title{color:var(--text);-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;margin:0 0 10px;font-size:14px;font-weight:600;line-height:1.4;display:-webkit-box;overflow:hidden}.dash-card-badge{color:var(--text-muted);background:var(--surface-2);border:1px solid var(--border);border-radius:20px;padding:3px 10px;font-size:11px;font-weight:500;display:inline-block}.dash-card-progress{flex-direction:column;gap:6px;display:flex}.dash-progress-bar{background:var(--border);border-radius:99px;height:3px;overflow:hidden}.dash-progress-fill{background:var(--accent);border-radius:99px;height:100%;transition:width .3s}.dash-progress-label{color:var(--text-muted);font-size:11px}.dash-card-footer{color:var(--text-faint);align-items:center;gap:5px;margin-top:14px;font-size:11px;display:flex}.dash-new-btn{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);height:40px;color:var(--text);font:inherit;cursor:pointer;transition:background var(--transition), border-color var(--transition), color var(--transition), transform var(--transition);justify-content:center;align-items:center;gap:8px;padding:0 16px;font-size:13px;font-weight:600;line-height:1;display:inline-flex}.dash-new-btn svg{width:14px;height:14px;color:var(--accent);flex-shrink:0;display:block;transform:translateY(-.5px)}.dash-new-btn:hover{background:var(--surface-2);border-color:var(--accent);color:var(--accent)}.dash-new-btn:active{transform:translateY(1px)}.dash-new-btn:focus-visible{box-shadow:0 0 0 3px var(--accent-dim);outline:none}.sp-wrap{background:var(--bg);min-height:100vh;color:var(--text-primary);flex-direction:column;font-family:DM Sans,sans-serif;transition:background .2s;display:flex}.sp-loading-screen,.sp-error-screen{background:var(--bg);justify-content:center;align-items:center;min-height:100vh;display:flex}.sp-header{border-bottom:.5px solid var(--border);background:var(--bg);z-index:10;justify-content:space-between;align-items:center;height:52px;padding:0 24px;display:flex;position:sticky;top:0}.sp-back-btn{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;align-items:center;gap:6px;padding:6px 0;font-family:DM Sans,sans-serif;font-size:13px;font-weight:400;transition:color .15s;display:flex}.sp-back-btn:hover{color:var(--text-primary)}.sp-session-title{color:var(--text-primary);letter-spacing:-.2px;text-overflow:ellipsis;white-space:nowrap;max-width:40%;font-family:DM Serif Display,serif;font-size:16px;font-weight:400;position:absolute;left:50%;overflow:hidden;transform:translate(-50%)}.sp-theme-btn{border:.5px solid var(--border-mid);cursor:pointer;width:30px;height:30px;color:var(--text-secondary);background:0 0;border-radius:7px;justify-content:center;align-items:center;transition:background .15s,color .15s;display:flex}.sp-theme-btn:hover{background:var(--bg-surface);color:var(--text-primary)}.sp-progress-wrap{border-bottom:.5px solid var(--border);background:var(--bg);align-items:center;gap:10px;height:36px;padding:0 24px;display:flex}.sp-progress-track{background:var(--border);border-radius:99px;flex:1;height:3px;overflow:hidden}.sp-progress-fill{background:var(--accent);border-radius:99px;height:100%;transition:width .4s}.sp-progress-label{color:var(--text-muted);letter-spacing:.3px;white-space:nowrap;font-size:11px;font-weight:500}.sp-main{flex:1;padding:0 0 16px;overflow-y:auto}.sp-messages{flex-direction:column;gap:12px;max-width:680px;margin:0 auto;padding:24px 24px 0;display:flex}.sp-empty{text-align:center;flex-direction:column;align-items:center;gap:10px;padding:64px 24px 32px;display:flex}.sp-empty-icon{color:var(--text-muted);letter-spacing:-1px;margin-bottom:4px;font-family:DM Serif Display,serif;font-size:28px}.sp-empty-title{color:var(--text-primary);letter-spacing:-.3px;margin:0;font-family:DM Serif Display,serif;font-size:20px;font-weight:400}.sp-empty-sub{color:var(--text-secondary);max-width:340px;margin:0;font-size:13px;font-weight:300;line-height:1.6}.sp-message{display:flex}.sp-message--user{justify-content:flex-end}.sp-message--assistant{justify-content:flex-start}.sp-message-bubble{border-radius:12px;max-width:78%;padding:11px 14px;font-size:14px;font-weight:400;line-height:1.55}.sp-message--user .sp-message-bubble{background:var(--accent);color:#e6f1fb;border-bottom-right-radius:4px}.sp-message--assistant .sp-message-bubble{background:var(--bg-surface);color:var(--text-primary);border:.5px solid var(--border);border-bottom-left-radius:4px}.sp-message-bubble--error{color:#a32d2d!important;background:#fcebeb!important;border-color:#f09595!important}[data-theme=dark] .sp-message-bubble--error{color:#f08080!important;background:#a32d2d26!important;border-color:#f095954d!important}.sp-file-tag{opacity:.7;align-items:center;gap:5px;margin-bottom:6px;font-size:11px;font-weight:500;display:flex}.sp-questions{flex-direction:column;gap:10px;display:flex}.sp-questions-label{color:var(--text-primary);margin:0;font-size:13px;font-weight:400}.sp-questions-preview{flex-wrap:wrap;gap:6px;display:flex}.sp-question-chip{background:var(--bg);border:.5px solid var(--border-mid);border-radius:6px;align-items:center;gap:5px;padding:3px 9px;font-size:11px;font-weight:500;display:flex}.sp-question-chip--more{color:var(--text-muted);border-style:dashed}.sp-question-chip-num{color:var(--text-muted)}.sp-question-chip-type{color:var(--accent-soft)}.sp-feedback{flex-direction:column;gap:10px;display:flex}.sp-score-badge{letter-spacing:.2px;border-radius:6px;align-items:center;gap:7px;width:fit-content;padding:4px 10px;font-size:12px;font-weight:500;display:inline-flex}.sp-score-badge--correct{color:#16a34a;background:#22c55e1f;border:.5px solid #22c55e40}.sp-score-badge--partial{color:#a16207;background:#eab3081f;border:.5px solid #eab30840}.sp-score-badge--incorrect{color:#dc2626;background:#ef44441a;border:.5px solid #ef444433}[data-theme=dark] .sp-score-badge--correct{color:#4ade80;background:#22c55e26;border-color:#22c55e33}[data-theme=dark] .sp-score-badge--partial{color:#facc15;background:#eab30826;border-color:#eab30833}[data-theme=dark] .sp-score-badge--incorrect{color:#f87171;background:#ef444426;border-color:#ef444433}.sp-score-pct{opacity:.7;font-size:11px}.sp-feedback-text{color:var(--text-primary);margin:0;font-size:13px;line-height:1.6}.sp-misconception{color:var(--text-secondary);border-top:.5px solid var(--border);margin:0;padding-top:4px;font-size:12px;font-style:italic}.sp-question-card{background:var(--bg-card);border:.5px solid var(--border-mid);border-radius:12px;margin:8px 0 4px;padding:20px}.sp-question-card-header{justify-content:space-between;align-items:center;margin-bottom:14px;display:flex}.sp-question-num{color:var(--text-muted);letter-spacing:.4px;text-transform:uppercase;font-size:11px;font-weight:500}.sp-question-type-badge{letter-spacing:.5px;text-transform:uppercase;color:var(--accent-text);background:var(--accent-bg);border:.5px solid #185fa533;border-radius:4px;padding:2px 8px;font-size:10px;font-weight:500}.sp-question-prompt{color:var(--text-primary);letter-spacing:-.2px;margin:0 0 18px;font-family:DM Serif Display,serif;font-size:17px;font-weight:400;line-height:1.5}.sp-choices{flex-direction:column;gap:8px;display:flex}.sp-choice{background:var(--bg-surface);border:.5px solid var(--border-mid);cursor:pointer;text-align:left;width:100%;color:var(--text-primary);border-radius:9px;align-items:flex-start;gap:12px;padding:11px 14px;font-family:DM Sans,sans-serif;font-size:14px;font-weight:400;line-height:1.45;transition:background 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