:root{color-scheme:light;--background: #f7f8fb;--foreground: #111827;--card: rgba(255,255,255,.88);--card-foreground: #172033;--primary: #2563eb;--primary-foreground: #fff;--secondary: #eef2ff;--muted: #f1f5f9;--muted-foreground: #64748b;--border: rgba(15,23,42,.1);--input: rgba(15,23,42,.14);--ring: rgba(37,99,235,.28);--danger: #ef4444;--warning: #f59e0b;--radius: 14px;--shadow-sm: 0 1px 2px rgba(15,23,42,.06);--shadow-md: 0 18px 50px rgba(15,23,42,.09);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}.dark{color-scheme:dark;--background: #0b1020;--foreground: #eef2ff;--card: rgba(17,24,39,.82);--card-foreground: #e5e7eb;--primary: #60a5fa;--primary-foreground: #07111f;--secondary: rgba(96,165,250,.13);--muted: rgba(148,163,184,.12);--muted-foreground: #94a3b8;--border: rgba(226,232,240,.12);--input: rgba(226,232,240,.18);--ring: rgba(96,165,250,.35);--shadow-sm: 0 1px 2px rgba(0,0,0,.2);--shadow-md: 0 18px 55px rgba(0,0,0,.32)}*{box-sizing:border-box}body{margin:0;background:var(--background);color:var(--foreground)}button,input,select,textarea{font:inherit}button{cursor:pointer}.app-shell{min-height:100vh;display:grid;grid-template-columns:252px 1fr}.sidebar{position:sticky;top:0;height:100vh;padding:22px 16px;border-right:1px solid var(--border);background:color-mix(in srgb,var(--card),transparent 10%);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.brand{display:flex;gap:12px;align-items:center;padding:6px 8px 26px}.brand-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;color:var(--primary-foreground);background:var(--primary);box-shadow:var(--shadow-sm)}.brand strong{display:block;line-height:1.1}.brand span,.eyebrow,.hint,.chart-card p{color:var(--muted-foreground);font-size:13px}.sidebar nav{display:grid;gap:6px}.sidebar button,.mobile-nav 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12px;text-decoration:none;box-shadow:var(--shadow-sm)}.icon-btn{width:38px;padding:0}.primary{border-color:transparent;background:var(--primary);color:var(--primary-foreground);font-weight:700}.secondary{background:var(--secondary)}.pill{font-size:12px;color:var(--primary);background:var(--secondary);border:1px solid var(--border);border-radius:999px;padding:7px 10px}.page-fade{animation:fade .16s ease-out}@keyframes fade{0%{opacity:0;transform:translateY(3px)}to{opacity:1;transform:none}}.stack{display:grid;gap:16px}.toolbar{display:flex;justify-content:space-between;gap:12px;align-items:center}.segmented{display:inline-flex;align-items:center;gap:4px;padding:4px;border:1px solid var(--border);border-radius:12px;background:var(--card)}.segmented span{padding:0 12px;color:var(--muted-foreground)}.segmented button{min-height:32px;border:0;box-shadow:none;background:transparent}.segmented button.active{background:var(--secondary);color:var(--foreground)}.panel,.stat-card{background:var(--card);color:var(--card-foreground);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm)}.panel{padding:18px}.panel:hover,.stat-card:hover{transform:translateY(-1px);transition:transform .16s ease,border-color .16s ease;border-color:color-mix(in srgb,var(--primary),var(--border) 65%)}.panel h2{margin:0 0 12px;font-size:17px;letter-spacing:0}.schedule-grid{display:grid;grid-template-columns:72px repeat(7,minmax(110px,1fr));gap:1px;padding:0;overflow:hidden}.grid-head,.period,.cell{min-height:82px;padding:10px;background:color-mix(in srgb,var(--card),var(--muted) 20%)}.grid-head,.period{min-height:48px;display:grid;place-items:center;font-size:13px;font-weight:700;color:var(--muted-foreground)}.cell{display:grid;align-content:start;gap:8px}.cell.conflict{outline:2px solid var(--warning);outline-offset:-2px}.course-block{text-align:left;width:100%;min-height:118px;border:0;border-left:4px solid var(--course);border-radius:10px;background:color-mix(in srgb,var(--course),var(--card) 86%);color:var(--foreground);padding:10px;display:grid;gap:4px}.course-block strong{font-size:14px}.course-block span,.course-block em{font-size:12px;color:var(--muted-foreground);font-style:normal}.mobile-timeline{display:none}.timeline-item{display:flex;gap:12px;padding:10px 0;border-top:1px solid var(--border)}.timeline-item time{color:var(--primary);font-weight:800;min-width:56px}.timeline-item span{display:block;color:var(--muted-foreground);font-size:13px;margin-top:4px}.empty-note{margin:0;color:var(--muted-foreground);line-height:1.6}.two-col{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:16px;align-items:start}.course-card{display:grid;gap:12px}.course-card h2{margin-bottom:4px}.course-card 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var(--input);border-radius:10px;background:var(--background);color:var(--foreground);min-height:40px;padding:9px 10px;outline:none}textarea{min-height:92px;resize:vertical}input:focus,select:focus,textarea:focus{border-color:var(--primary);box-shadow:0 0 0 4px var(--ring)}.stats-grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:12px}.stat-card{padding:15px;display:grid;gap:10px;min-height:92px}.stat-card span{color:var(--muted-foreground);font-size:13px}.stat-card strong{font-size:24px;letter-spacing:0;overflow-wrap:anywhere}.analytics-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.chart-card{min-height:360px}.recharts-cartesian-grid line{stroke:var(--border)}.recharts-text{fill:var(--muted-foreground);font-size:12px}.simulator{display:grid;gap:12px}.simulator p{color:var(--muted-foreground);margin:0}.bad{color:var(--danger)}.compare{display:grid;grid-template-columns:1fr 1fr 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span{display:block;color:var(--muted-foreground);font-size:13px;margin-top:4px}pre{margin:0;white-space:pre-wrap;overflow:auto;max-height:260px;font-size:12px;color:var(--muted-foreground)}.settings-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color:var(--muted-foreground);overflow-wrap:anywhere}.rule-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.rule-list div{padding:10px;border-radius:10px;background:var(--muted);display:flex;justify-content:space-between;gap:8px}.switch{display:flex;grid-template-columns:auto 1fr;align-items:center;gap:10px;color:var(--foreground)}.switch 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h1{font-size:23px}.top-actions{width:100%;gap:6px;flex-wrap:wrap;justify-content:flex-start}.user-chip{max-width:150px;overflow:hidden;white-space:nowrap}.toolbar{align-items:stretch;flex-direction:column}.schedule-grid{display:none}.mobile-timeline{display:block}.stats-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.stat-card strong{font-size:20px}.import-layout{grid-template-columns:1fr}.mobile-nav{position:fixed;left:0;right:0;bottom:0;display:grid;grid-template-columns:repeat(5,1fr);gap:2px;padding:8px max(8px,env(safe-area-inset-left)) calc(8px + env(safe-area-inset-bottom));border-top:1px solid var(--border);background:color-mix(in srgb,var(--card),transparent 4%);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);z-index:20}.mobile-nav button{min-height:52px;justify-content:center;flex-direction:column;gap:3px;padding:0;font-size:11px}.panel{border-radius:12px;padding:14px}.rule-list{grid-template-columns:repeat(2,minmax(0,1fr))}}