:root{--bg: #FAFAFA;--surface: #FFFFFF;--text: #1D1D1F;--text-muted: #6E6E73;--border: #D2D2D7;--accent: #0071E3;--conflict: #BF5AF2;--success: #30D158;--danger: #FF453A;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--radius: 8px;--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--font-mono: "SF Mono", "Fira Code", monospace;--fs-sm: 12px;--fs-base: 14px;--fs-lg: 16px;--fs-xl: 20px;--fs-2xl: 28px;--shadow-subtle: 0 1px 2px rgba(0, 0, 0, .04)}*{box-sizing:border-box;margin:0;padding:0}html{font-size:var(--fs-base);font-family:var(--font-sans);line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{background-color:var(--bg);color:var(--text);min-height:100vh}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.app{min-height:100vh;display:flex;flex-direction:column}.app-header{padding:var(--space-4) var(--space-6);border-bottom:1px solid var(--border);background:var(--surface)}.app-header h1{font-size:var(--fs-2xl);font-weight:600;letter-spacing:-.02em;color:var(--text)}.app-main{flex:1;padding:var(--space-6);max-width:1200px;width:100%;margin:0 auto}.layout-grid{display:grid;grid-template-columns:1fr;gap:var(--space-6)}@media(min-width:1024px){.layout-grid{grid-template-columns:380px 1fr;align-items:start}}.panel-title{font-size:var(--fs-xl);font-weight:600;margin-bottom:var(--space-4);color:var(--text)}.form-panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:var(--space-6);box-shadow:var(--shadow-subtle)}.form-section{border:none;padding:0;margin-bottom:var(--space-5)}.form-section:last-of-type{margin-bottom:var(--space-4)}.form-section legend{font-size:var(--fs-sm);font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);margin-bottom:var(--space-3);padding:0}.form-row{display:grid;grid-template-columns:1fr;gap:var(--space-3)}@media(min-width:480px){.form-row{grid-template-columns:repeat(2,1fr)}}.form-row:last-child{margin-bottom:0}.form-field{display:flex;flex-direction:column;gap:var(--space-1)}.form-field label{font-size:var(--fs-sm);font-weight:500;color:var(--text)}.form-field input,.form-field select{height:40px;padding:0 var(--space-3);border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);color:var(--text);font-size:var(--fs-base);font-family:var(--font-sans);transition:border-color .15s ease,box-shadow .15s ease}.form-field input::placeholder{color:var(--text-muted)}.form-field input:hover,.form-field select:hover{border-color:var(--accent)}.form-field input:focus,.form-field select:focus{border-color:var(--accent);box-shadow:0 0 0 3px #0071e326}.form-actions{display:flex;justify-content:flex-end;gap:var(--space-3);padding-top:var(--space-3);border-top:1px solid var(--border);margin-top:var(--space-2)}.grid-panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-subtle)}.timetable-grid-container{overflow-x:auto}.timetable-grid{width:100%;border-collapse:collapse;font-size:var(--fs-sm)}.timetable-grid th,.timetable-grid td{border:1px solid var(--border);padding:var(--space-2) var(--space-3);text-align:left;vertical-align:top}.timetable-grid th{background:var(--bg);font-weight:600;font-size:var(--fs-sm);color:var(--text-muted);white-space:nowrap}.time-column{width:70px;min-width:70px;text-align:right;font-variant-numeric:tabular-nums;font-family:var(--font-mono)}.time-label{font-variant-numeric:tabular-nums;font-family:var(--font-mono);color:var(--text-muted);white-space:nowrap}.grid-cell{min-height:44px;height:44px}.cell-content{min-height:100%}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--space-6) var(--space-4);text-align:center;min-height:300px}.empty-state-text{color:var(--text-muted);margin-bottom:var(--space-4);font-size:var(--fs-base)}.btn{height:40px;padding:0 var(--space-4);border-radius:var(--radius);font-size:var(--fs-base);font-weight:600;font-family:var(--font-sans);cursor:pointer;transition:background-color .15s ease,border-color .15s ease,color .15s ease;min-width:120px}.btn-primary{background:var(--accent);color:#fff;border:none}.btn-primary:hover{background:#005bb5}.btn-primary:active{background:#004a96}.btn-secondary{background:transparent;color:var(--accent);border:1px solid var(--accent)}.btn-secondary:hover{background:#0071e314}.btn-secondary:active{background:#0071e31f}.btn-danger{background:transparent;color:var(--danger);border:1px solid var(--danger)}.btn-danger:hover{background:#ff453a14}.btn-danger:active{background:#ff453a1f}.btn-sm{height:32px;padding:0 var(--space-3);font-size:var(--fs-sm);min-width:auto}.conflict-alert{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-4);background:#bf5af21a;border-left:4px solid var(--conflict);border-radius:var(--radius);margin-bottom:var(--space-4);color:var(--conflict)}.conflict-icon{width:20px;height:20px;flex-shrink:0}.conflict-message{flex:1;font-size:var(--fs-sm);font-weight:500}.conflict-dismiss{width:28px;height:28px;display:flex;align-items:center;justify-content:center;background:transparent;border:none;border-radius:var(--radius);color:var(--conflict);cursor:pointer;padding:0;transition:background-color .15s ease}.conflict-dismiss:hover{background:#bf5af226}.conflict-dismiss svg{width:16px;height:16px}.schedule-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:var(--space-2) var(--space-3);margin-bottom:var(--space-1);cursor:pointer;transition:box-shadow .15s ease,border-color .15s ease;box-shadow:var(--shadow-subtle)}.schedule-card:last-child{margin-bottom:0}.schedule-card:hover{box-shadow:0 2px 8px #00000014;border-color:var(--accent)}.schedule-card:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.schedule-card.conflict{border-left:4px solid var(--conflict)}.card-course{display:block;font-weight:600;font-size:var(--fs-sm);color:var(--text);margin-bottom:var(--space-1)}.card-lecturer,.card-room{display:block;font-size:var(--fs-sm);color:var(--text-muted)}.schedule-list{margin-top:var(--space-6);padding-top:var(--space-4);border-top:1px solid var(--border)}.list-title{font-size:var(--fs-lg);font-weight:600;margin-bottom:var(--space-3);color:var(--text)}.list{list-style:none;display:flex;flex-direction:column;gap:var(--space-2)}.list-item{display:flex;align-items:center;justify-content:space-between;gap:var(--space-3);padding:var(--space-3);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-subtle)}.list-item-info{display:flex;flex-direction:column;gap:var(--space-1);flex:1;min-width:0}.list-item-course{font-weight:600;font-size:var(--fs-base);color:var(--text)}.list-item-details{font-size:var(--fs-sm);color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.list-item-actions{display:flex;gap:var(--space-2);flex-shrink:0}.field-error{font-size:var(--fs-sm);color:var(--danger);margin-top:var(--space-1)}.form-field input[aria-invalid=true],.form-field select[aria-invalid=true]{border-color:var(--danger)}.form-field input[aria-invalid=true]:focus,.form-field select[aria-invalid=true]:focus{box-shadow:0 0 0 3px #ff453a26}@media(max-width:639px){.app-main,.form-panel{padding:var(--space-4)}.form-row{grid-template-columns:1fr}.form-actions{flex-direction:column-reverse}.btn{width:100%}.empty-state{min-height:200px;padding:var(--space-4)}.list-item{flex-direction:column;align-items:flex-start}.list-item-actions{width:100%;justify-content:flex-end}.btn-sm{padding:0 var(--space-3)}.timetable-desktop{display:none}.timetable-mobile{display:block}.mobile-day-section{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:var(--space-3);box-shadow:var(--shadow-subtle);overflow:hidden}.mobile-day-summary{display:flex;align-items:center;justify-content:space-between;padding:var(--space-3) var(--space-4);background:var(--bg);border-bottom:1px solid var(--border);cursor:pointer;list-style:none}.mobile-day-summary::-webkit-details-marker{display:none}.mobile-day-label{font-weight:600;font-size:var(--fs-base);color:var(--text)}.mobile-day-count{font-size:var(--fs-sm);color:var(--text-muted)}.mobile-day-toggle{font-size:var(--fs-sm);color:var(--text-muted);transition:transform .2s ease}.mobile-day-section[open] .mobile-day-toggle{transform:rotate(180deg)}.mobile-day-content{padding:var(--space-2)}.schedule-card.mobile{margin-bottom:var(--space-2);animation:slideIn .2s ease-out}.schedule-card.mobile:last-child{margin-bottom:0}.mobile-card-header{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:var(--space-1)}.mobile-card-time{font-size:var(--fs-sm);color:var(--text-muted);font-family:var(--font-mono);font-variant-numeric:tabular-nums}}@media(min-width:640px){.timetable-mobile{display:none}}@keyframes slideIn{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeOut{0%{opacity:1;transform:translateY(0)}to{opacity:0;transform:translateY(-8px)}}.schedule-card{animation:slideIn .2s ease-out}