:root{font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#192033;background:#f4f6fb;--card:#fff;--line:#e5e8f0;--muted:#697386;--accent:#4f46e5;--accent-soft:#eef0ff;--success:#0b8f6b;--warning:#c66a00;--danger:#c83c47;--shadow:0 10px 30px rgba(20,28,45,.06)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg,#f4f6fb);transition:.2s}button,input,select,textarea{font:inherit}button{cursor:pointer}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid rgba(79,70,229,.22);outline-offset:1px}
.app-shell{min-height:100vh;display:flex}.sidebar{width:240px;padding:20px 16px;background:#111827;color:#fff;display:flex;flex-direction:column;gap:24px;position:sticky;top:0;height:100vh}.brand{display:flex;gap:11px;align-items:center}.brand-icon{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;background:rgba(255,255,255,.12);font-size:21px}.brand h1{font-size:20px;margin:0}.brand p{margin:3px 0 0;color:#aeb7c7;font-size:12px}.sidebar nav{display:grid;gap:6px}.nav-btn{border:0;background:transparent;color:#cbd5e1;text-align:left;padding:10px 11px;border-radius:10px;display:flex;gap:9px;align-items:center}.nav-btn:hover,.nav-btn.active{background:#253047;color:#fff}.sidebar-bottom{margin-top:auto;display:grid;gap:12px}.theme-row{display:flex;justify-content:space-between;align-items:center;color:#cbd5e1;font-size:12px}.switch{position:relative;width:42px;height:24px}.switch input{opacity:0;width:0;height:0}.switch span{position:absolute;inset:0;border-radius:999px;background:#374151}.switch span:before{content:"";position:absolute;width:18px;height:18px;left:3px;top:3px;background:#fff;border-radius:50%;transition:.2s}.switch input:checked+span{background:#6366f1}.switch input:checked+span:before{transform:translateX(18px)}.sidebar-note{border:1px solid rgba(255,255,255,.1);border-radius:14px;padding:13px;background:rgba(255,255,255,.04)}.sidebar-note strong,.sidebar-note span{display:block}.sidebar-note span{color:#aeb7c7;font-size:12px;margin-top:5px;line-height:1.45}
.main-content{flex:1;padding:26px;max-width:1500px;margin:0 auto;width:100%}.topbar{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:20px}.top-actions{display:flex;gap:8px}.eyebrow{font-size:11px;font-weight:800;letter-spacing:.11em;color:#7b8497;margin:0 0 5px}h2,h3,h4,p{margin-top:0}h2{margin-bottom:0;font-size:28px}h3{margin-bottom:6px;font-size:18px}h4{margin-bottom:5px}p{color:var(--muted);line-height:1.5}.primary-btn,.secondary-btn,.link-btn{border:0;border-radius:10px;padding:10px 14px;font-weight:700}.primary-btn{color:#fff;background:var(--accent);box-shadow:0 4px 12px rgba(79,70,229,.18)}.secondary-btn{background:#eef1f6;color:#273149}.link-btn{background:transparent;color:var(--accent);padding:7px 2px}.full-btn{width:100%;margin-top:3px}.page-section{display:none}.active-section{display:block}
.welcome-card{background:linear-gradient(135deg,#fff,#f0f2ff);border:1px solid var(--line);border-radius:18px;padding:22px;display:flex;justify-content:space-between;gap:20px;align-items:center;box-shadow:var(--shadow)}.welcome-card h3{font-size:23px}.today-pill{white-space:nowrap;padding:10px 13px;border-radius:999px;background:var(--accent-soft);color:var(--accent);font-size:13px;font-weight:700}.stats-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:14px 0}.stat-card{background:var(--card);border:1px solid var(--line);border-radius:15px;padding:16px;box-shadow:var(--shadow)}.stat-card span,.stat-card strong,.stat-card small{display:block}.stat-card span{color:var(--muted);font-size:12px}.stat-card strong{font-size:28px;margin-top:3px}.stat-card small{color:#8a93a4;font-size:11px;margin-top:2px}.content-grid{display:grid;grid-template-columns:1.45fr 1fr;gap:14px}.three-grid{grid-template-columns:repeat(3,1fr);margin-top:14px}.planner-grid{grid-template-columns:1.35fr .8fr}.panel{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:18px;box-shadow:var(--shadow)}.panel-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:14px;margin-bottom:14px}.panel-heading p{margin-bottom:0;font-size:13px}.goal-wrap{padding:4px 2px 12px}.goal-number{font-size:27px;font-weight:800;margin-bottom:8px}.progress-track{height:10px;background:#eceff5;border-radius:999px;overflow:hidden}.progress-fill{height:100%;width:0;background:var(--accent);border-radius:inherit;transition:.25s}.goal-wrap p{font-size:12px;margin:8px 0 0}.tip-box{border-radius:14px;background:#f7f8ff;border:1px solid #ebedff;padding:14px}.tip-icon{font-size:23px;margin-bottom:6px}.tip-box p{margin:0;font-size:13px}.quick-card{display:flex;gap:11px;align-items:flex-start}.quick-icon{width:38px;height:38px;display:grid;place-items:center;border-radius:11px;background:var(--accent-soft);font-size:19px;flex:0 0 auto}.quick-card h3{font-size:15px;margin-bottom:4px}.quick-card p{font-size:12px;margin:0}.quick-card .link-btn{margin-left:auto;white-space:nowrap}
.filter-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}.select-input,.text-input,.form-grid input,form label>input,form label>select,form label>textarea,textarea{border:1px solid var(--line);border-radius:10px;padding:10px 12px;background:var(--card);min-width:0;color:inherit}.text-input{width:235px}.task-list{display:grid;gap:9px}.task-item{display:flex;align-items:center;gap:10px;border:1px solid var(--line);border-radius:14px;padding:11px}.task-check{width:23px;height:23px;border-radius:7px;border:1px solid #cbd2df;display:grid;place-items:center;flex:0 0 auto;background:var(--card);color:var(--success)}.task-check.done{background:#e9f8f3;border-color:#b9e6d7}.task-main{flex:1;min-width:0}.task-title{margin:0;font-weight:750;font-size:14px}.task-title.done-text{text-decoration:line-through;color:#8b93a3}.task-meta{margin:3px 0 0;font-size:12px;color:var(--muted)}.task-badges{display:flex;gap:5px;align-items:center;flex-wrap:wrap;justify-content:flex-end}.badge{font-size:10px;padding:5px 8px;border-radius:999px;background:#f2f4f8;color:#5b6475}.badge.high{background:#fff2f2;color:var(--danger)}.badge.medium{background:#fff7e8;color:var(--warning)}.badge.low{background:#eef8f5;color:var(--success)}.delete-btn{border:0;background:transparent;color:#9aa2b1;padding:6px}.delete-btn:hover{color:var(--danger)}.empty{padding:28px 8px;text-align:center;color:var(--muted);border:1px dashed var(--line);border-radius:12px}
.exam-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:11px}.exam-card{border:1px solid var(--line);border-radius:14px;padding:14px}.exam-top{display:flex;justify-content:space-between;gap:10px;align-items:start}.countdown{font-size:12px;font-weight:800;color:var(--accent);background:var(--accent-soft);border-radius:999px;padding:6px 8px;white-space:nowrap}.exam-card h4{font-size:16px;margin-bottom:3px}.exam-meta{font-size:12px;color:var(--muted)}.exam-note{font-size:12px;background:#f8f9fc;border-radius:10px;padding:9px;margin:10px 0}.exam-actions{text-align:right}.danger-link{color:var(--danger);border:0;background:transparent;font-weight:700;font-size:12px}
.table-scroll{overflow:auto}.timetable{width:100%;border-collapse:collapse;min-width:650px}.timetable th,.timetable td{padding:12px;text-align:left;border-bottom:1px solid var(--line);font-size:13px}.timetable th{font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:#7b8497}.timetable .day-pill{display:inline-block;padding:5px 8px;border-radius:999px;background:var(--accent-soft);color:var(--accent);font-weight:700;font-size:11px}
.notes-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:11px}.note-card{border:1px solid var(--line);border-radius:14px;padding:14px;display:flex;flex-direction:column;min-height:165px}.note-card h4{margin-bottom:3px}.note-subject{font-size:11px;color:var(--accent);font-weight:800}.note-body{font-size:12px;white-space:pre-wrap;flex:1;margin:10px 0}.note-actions{text-align:right}.note-delete{border:0;background:transparent;color:var(--danger);font-weight:700;font-size:12px}
.planner-controls{display:flex;gap:10px;align-items:end;flex-wrap:wrap;margin-bottom:12px}.planner-controls label{display:grid;gap:6px;font-size:12px;font-weight:700}.planner-controls select{border:1px solid var(--line);border-radius:10px;padding:9px 11px;background:var(--card);color:inherit}.plan-list{display:grid;gap:9px}.plan-item{display:flex;gap:10px;border:1px solid var(--line);border-radius:13px;padding:12px;align-items:center}.plan-index{width:28px;height:28px;border-radius:9px;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;font-weight:800;font-size:12px;flex:0 0 auto}.plan-main{flex:1}.plan-main strong{display:block;font-size:13px}.plan-main span{display:block;font-size:11px;color:var(--muted);margin-top:3px}.plan-time{font-size:11px;font-weight:800;color:#505a6d}.timer{text-align:center;padding:18px 8px}.timer-mode{font-size:12px;font-weight:800;color:var(--accent);text-transform:uppercase;letter-spacing:.08em}.timer-display{font-variant-numeric:tabular-nums;font-size:64px;font-weight:850;letter-spacing:.03em;margin:12px 0}.timer-actions{display:flex;justify-content:center;gap:8px;flex-wrap:wrap}.timer p{font-size:12px;margin:12px 0 0}
.progress-visual{display:flex;align-items:center;gap:24px;padding:16px 0}.progress-circle{width:150px;height:150px;border-radius:50%;display:grid;place-items:center;background:conic-gradient(var(--accent) 0deg,#eceff5 0deg);position:relative;flex:0 0 auto}.progress-circle:before{content:"";width:116px;height:116px;border-radius:50%;background:var(--card);position:absolute}.progress-circle span{position:relative;font-weight:850;font-size:27px}.stat-list{display:grid;gap:7px}.stat-list>div{display:flex;justify-content:space-between;align-items:center;padding:10px 0;border-bottom:1px solid var(--line)}.stat-list span{font-size:12px;color:var(--muted)}.subject-progress-panel{margin-top:14px}.subject-progress-list{display:grid;gap:9px}.subject-row{display:grid;grid-template-columns:120px 1fr 50px;gap:10px;align-items:center}.subject-row>span:first-child{font-size:12px;font-weight:700}.subject-bar{height:8px;border-radius:999px;background:#eceff5;overflow:hidden}.subject-bar>span{display:block;height:100%;background:var(--accent);border-radius:inherit}.subject-percent{text-align:right;font-size:11px;color:var(--muted)}
.modal{position:fixed;inset:0;background:rgba(10,16,30,.5);display:none;place-items:center;padding:18px;z-index:20}.modal.show{display:grid}.modal-card{width:min(540px,100%);max-height:90vh;overflow:auto;background:var(--card);border-radius:18px;padding:20px}.modal-header{display:flex;justify-content:space-between;align-items:start;margin-bottom:14px}.icon-btn{border:0;background:#f1f3f7;color:#273149;width:36px;height:36px;border-radius:10px}form{display:grid;gap:12px}form label{display:grid;gap:6px;font-size:13px;font-weight:650}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.toast{position:fixed;left:50%;bottom:20px;transform:translate(-50%,20px);background:#111827;color:#fff;padding:10px 14px;border-radius:10px;opacity:0;pointer-events:none;transition:.2s;z-index:30;font-size:13px}.toast.show{opacity:1;transform:translate(-50%,0)}
body.dark{--card:#182033;--line:#2d374c;--muted:#aab3c5;--accent-soft:#232b53;--bg:#0f1728;color:#ecf1ff}.dark .welcome-card{background:linear-gradient(135deg,#182033,#20294a)}.dark .secondary-btn,.dark .icon-btn{background:#273148;color:#e6ebf5}.dark .tip-box,.dark .exam-note{background:#1c2436;border-color:#2d374c}.dark .progress-track,.dark .subject-bar{background:#30394c}.dark .text-input,.dark .select-input,.dark .form-grid input,.dark form label>input,.dark form label>select,.dark form label>textarea,.dark textarea{background:#182033;color:#ecf1ff}.dark .empty{border-color:#354057}
@media(max-width:1100px){.sidebar{width:210px}.three-grid{grid-template-columns:1fr}.notes-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:820px){.app-shell{display:block}.sidebar{position:relative;width:100%;height:auto;padding:14px}.sidebar nav{grid-template-columns:repeat(4,1fr)}.nav-btn{justify-content:center;text-align:center;font-size:11px;flex-direction:column;gap:2px;padding:8px}.sidebar-bottom{display:none}.main-content{padding:16px}.content-grid,.planner-grid{grid-template-columns:1fr}.stats-grid{grid-template-columns:repeat(2,1fr)}.exam-grid{grid-template-columns:1fr}.notes-grid{grid-template-columns:1fr}.welcome-card,.topbar{align-items:stretch;flex-direction:column}.top-actions{justify-content:stretch}.top-actions button{flex:1}.panel-heading{flex-direction:column}.text-input{width:100%}}@media(max-width:560px){.sidebar nav{grid-template-columns:repeat(4,1fr)}.nav-btn span{max-width:58px}.stats-grid{grid-template-columns:1fr 1fr}.form-grid{grid-template-columns:1fr}.task-item{align-items:flex-start}.task-badges{flex-direction:column}.timer-display{font-size:48px}.subject-row{grid-template-columns:90px 1fr 42px}}