:root{--blue:#2e8bc0;--blue-dark:#1a5f8a;--blue-light:#eef6fb;--blue-mid:#b8ddf2;--bg:#f7f8fa;--bg-card:#fff;--bg-sidebar:#fff;--fg:#0d0d0d;--fg-muted:#6b7280;--border:#e5e7eb;--border-subtle:#f3f4f6;--success:#16a34a;--warning:#d97706;--danger:#dc2626;--orange:#ff6b35;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--radius-xl:24px;--radius-pill:100px;--shadow-sm:0 1px 4px rgba(0,0,0,.06);--shadow-md:0 4px 16px rgba(0,0,0,.08);--shadow-lg:0 16px 48px rgba(0,0,0,.12);--shadow-blue:0 4px 20px rgba(46,139,192,.28);--sidebar-width:240px;--font:"Plus Jakarta Sans",-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif}[data-theme=dark]{--bg:#0f1117;--bg-card:#1a1d27;--bg-sidebar:#13151f;--fg:#f1f5f9;--fg-muted:#94a3b8;--border:#2d3148;--border-subtle:#1e2130;--blue-light:rgba(46,139,192,.15);--blue-mid:rgba(46,139,192,.3)}*,:after,:before{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth;font-size:16px}body{font-family:var(--font);background:var(--bg);color:var(--fg);-webkit-font-smoothing:antialiased;transition:background .2s,color .2s}a{color:inherit;text-decoration:none}ol,ul{list-style:none}button{cursor:pointer;font-family:var(--font)}img,video{max-width:100%;height:auto;display:block}h1{font-size:clamp(1.75rem,4vw,2.5rem);font-weight:800;letter-spacing:-.03em;line-height:1.15}h2{font-size:clamp(1.4rem,3vw,2rem);letter-spacing:-.025em;line-height:1.2}h2,h3{font-weight:700}h3{font-size:1.15rem;letter-spacing:-.02em}h4{font-size:1rem;font-weight:600}p{line-height:1.7}em{font-style:italic;color:var(--blue)}.studio-layout,.studio-main{display:flex;min-height:100vh}.studio-main{flex:1 1;margin-left:var(--sidebar-width);flex-direction:column}.studio-content{flex:1 1;padding:2rem;max-width:1200px;width:100%;margin-inline:auto}.sidebar{position:fixed;top:0;left:0;bottom:0;width:var(--sidebar-width);background:var(--bg-sidebar);border-right:1px solid var(--border);display:flex;flex-direction:column;z-index:100;transition:background .2s}.sidebar__logo{padding:1.5rem 1.25rem 1rem;border-bottom:1px solid var(--border);font-size:1.25rem;font-weight:800;letter-spacing:-.04em;color:var(--fg)}.sidebar__logo span{color:var(--blue)}.sidebar__nav{flex:1 1;padding:1rem .75rem;display:flex;flex-direction:column;gap:2px;overflow-y:auto}.sidebar__link{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:var(--radius-md);font-size:.875rem;font-weight:500;color:var(--fg-muted);transition:background .15s,color .15s;text-decoration:none}.sidebar__link:hover{background:var(--border-subtle);color:var(--fg)}.sidebar__link--active{background:var(--blue-light);color:var(--blue);font-weight:600}.sidebar__icon{font-size:1rem;width:20px;text-align:center;flex-shrink:0}.sidebar__bottom{padding:.75rem;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:2px}.sidebar__section-label{font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--fg-muted);padding:6px 12px 4px;margin-top:4px}.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;border-radius:var(--radius-md);font-size:.9rem;font-weight:600;border:none;cursor:pointer;transition:transform .15s,box-shadow .15s,opacity .15s;font-family:var(--font);text-decoration:none;white-space:nowrap}.btn:hover{transform:translateY(-1px)}.btn:active{transform:translateY(0)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn--primary{background:var(--blue);color:#fff;box-shadow:var(--shadow-blue)}.btn--primary:hover{box-shadow:0 6px 24px rgba(46,139,192,.38)}.btn--secondary{background:var(--bg-card);color:var(--fg);border:1px solid var(--border)}.btn--secondary:hover{border-color:var(--blue);color:var(--blue)}.btn--danger{background:var(--danger);color:#fff}.btn--ghost{background:transparent;color:var(--fg-muted);border:none;padding-inline:8px}.btn--ghost:hover{color:var(--fg);background:var(--border-subtle)}.btn--full{width:100%;justify-content:center}.btn--lg{padding:13px 28px;font-size:1rem}.btn--sm{padding:6px 14px;font-size:.8rem}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.5rem}.card--hover{transition:transform .2s,box-shadow .2s;cursor:pointer}.card--hover:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.input{width:100%;padding:10px 14px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);font-size:.9rem;color:var(--fg);font-family:var(--font);outline:none;transition:border-color .15s}.input:focus{border-color:var(--blue)}.input::placeholder{color:var(--fg-muted)}.label{display:block;font-size:.85rem;font-weight:600;color:var(--fg);margin-bottom:6px}.input-group{display:flex;flex-direction:column;gap:4px;margin-bottom:1rem}.input-error{border-color:var(--danger)}.error-text{font-size:.8rem;color:var(--danger);margin-top:4px}.badge{display:inline-flex;align-items:center;gap:5px;padding:3px 10px;border-radius:var(--radius-pill);font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em}.badge--blue{background:var(--blue-light);color:var(--blue)}.badge--green{background:#dcfce7;color:#16a34a}.badge--orange{background:#fff7ed;color:#d97706}.badge--red{background:#fef2f2;color:#dc2626}.badge--gray{background:var(--border-subtle);color:var(--fg-muted)}.topbar{height:60px;background:var(--bg-card);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding-inline:2rem;position:-webkit-sticky;position:sticky;top:0;z-index:50}.topbar__title{font-size:1rem;font-weight:700;color:var(--fg)}.topbar__actions{display:flex;align-items:center;gap:12px}.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.5);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:1000;display:flex;align-items:center;justify-content:center;padding:1rem}.modal{border-radius:var(--radius-xl);padding:2rem;max-width:480px;width:100%;box-shadow:var(--shadow-lg);max-height:90vh;overflow-y:auto}.modal,.search-bar{background:var(--bg-card)}.search-bar{display:flex;align-items:center;gap:10px;border:1px solid var(--border);border-radius:var(--radius-md);padding:10px 14px;transition:border-color .15s}.search-bar:focus-within{border-color:var(--blue)}.search-bar input{flex:1 1;background:none;border:none;outline:none;font-size:.9rem;color:var(--fg);font-family:var(--font)}.search-bar input::placeholder{color:var(--fg-muted)}.doc-card{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;padding:1rem 1.25rem;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);transition:border-color .15s,box-shadow .15s;cursor:pointer}.doc-card:hover{border-color:var(--blue);box-shadow:var(--shadow-sm)}.doc-card__icon{width:40px;height:40px;background:var(--blue-light);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:1.1rem;flex-shrink:0}.doc-card__title{font-weight:600;font-size:.9rem;margin-bottom:4px;color:var(--fg)}.doc-card__meta{font-size:.78rem;color:var(--fg-muted)}.flashcard{width:100%;aspect-ratio:3/2;perspective:1000px;cursor:pointer}.flashcard__inner{position:relative;width:100%;height:100%;transform-style:preserve-3d;transition:transform .5s}.flashcard--flipped .flashcard__inner{transform:rotateY(180deg)}.flashcard__face{position:absolute;inset:0;-webkit-backface-visibility:hidden;backface-visibility:hidden;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);display:flex;align-items:center;justify-content:center;padding:2rem;font-size:1.1rem;font-weight:600;text-align:center;color:var(--fg)}.flashcard__back{transform:rotateY(180deg);background:var(--blue-light);border-color:var(--blue-mid);color:var(--blue-dark)}.pomodoro{display:flex;flex-direction:column;align-items:center;gap:2rem;padding:3rem}.pomodoro__timer{font-size:5rem;font-weight:800;letter-spacing:-.04em;color:var(--fg);font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.pomodoro__ring{position:relative;width:220px;height:220px}.plan-card{border:2px solid var(--border);border-radius:var(--radius-lg);padding:1.5rem;cursor:pointer;transition:border-color .15s,background .15s;position:relative}.plan-card--selected{background:var(--blue-light)}.plan-card--popular,.plan-card--selected{border-color:var(--blue)}.onboarding{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:2rem;background:var(--bg)}.onboarding__card{background:var(--bg-card);border-radius:var(--radius-xl);padding:2.5rem;max-width:560px;width:100%;box-shadow:var(--shadow-lg)}.onboarding__progress{display:flex;gap:6px;margin-bottom:2rem}.onboarding__progress-dot{height:4px;flex:1 1;border-radius:2px;background:var(--border);transition:background .3s}.onboarding__progress-dot--active{background:var(--blue)}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:2rem;background:var(--bg)}.auth-card{background:var(--bg-card);border-radius:var(--radius-xl);padding:2.5rem;max-width:420px;width:100%;box-shadow:var(--shadow-lg)}.spinner{width:20px;height:20px;border:2px solid hsla(0,0%,100%,.3);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite;display:inline-block}.spinner--dark{border-color:rgba(0,0,0,.1);border-top-color:var(--blue)}@keyframes spin{to{transform:rotate(1turn)}}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:4rem 2rem;text-align:center;gap:1rem}.empty-state__icon{font-size:3rem}.empty-state__title{font-weight:700;font-size:1.1rem;color:var(--fg)}.empty-state__desc{color:var(--fg-muted);font-size:.9rem}@media (max-width:768px){.sidebar{transform:translateX(-100%);transition:transform .3s}.sidebar--open{transform:translateX(0)}.studio-main{margin-left:0}.studio-content{padding:1rem}.topbar{padding-inline:1rem}}