:root{color-scheme:light;--page: #f6f7f4;--surface: #ffffff;--surface-subtle: #fbfcfa;--surface-muted: #edf1eb;--surface-hover: #f2f7f4;--text: #17201b;--text-muted: #637066;--text-soft: #4d5a50;--text-label: #3d4941;--border: #dde2da;--border-strong: #cbd3ca;--border-hover: #9cb8aa;--accent: #1f6f55;--accent-strong: #2f7f62;--accent-muted: #e5f3eb;--accent-text: #1d4f3e;--warning-bg: #fff0d9;--warning-text: #87540d;--danger: #a13d35;--alert-bg: #fff4ed;--alert-border: #f0cbb8;--alert-text: #8a3a1f;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:var(--text);background:var(--page);font-synthesis:none;text-rendering:optimizeLegibility}[data-theme=dark]{color-scheme:dark;--page: #0e1412;--surface: #151d1a;--surface-subtle: #101815;--surface-muted: #1d2924;--surface-hover: #1a2f27;--text: #edf5ef;--text-muted: #98aaa0;--text-soft: #b6c6bc;--text-label: #c8d6ce;--border: #26342e;--border-strong: #354841;--border-hover: #4f7265;--accent: #3fa67f;--accent-strong: #61c79d;--accent-muted: #16382d;--accent-text: #9ee4c6;--warning-bg: #3d2c12;--warning-text: #f4c36f;--danger: #f08d83;--alert-bg: #351f18;--alert-border: #7c4632;--alert-text: #ffc2aa}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:var(--page);color:var(--text)}button,input{font:inherit}button{cursor:pointer}.app-shell{min-height:100vh}.topbar{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 32px;border-bottom:1px solid var(--border);background:color-mix(in srgb,var(--page) 92%,transparent);position:sticky;top:0;z-index:10;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.brand{font-size:20px;font-weight:750}.muted,.section-title p,.booking-row span{color:var(--text-muted);margin:0}.userbar{display:flex;align-items:center;gap:12px;color:var(--text-soft)}.screen,.auth-layout,.workspace{width:min(1180px,calc(100vw - 32px));margin:0 auto}.loading{padding:48px 0}.auth-layout{min-height:calc(100vh - 72px);display:grid;grid-template-columns:1fr 420px;gap:64px;align-items:center}.auth-copy h1{font-size:56px;line-height:1;margin:0 0 20px;letter-spacing:0;max-width:620px}.auth-copy p{font-size:20px;line-height:1.5;color:var(--text-soft);max-width:560px;margin:0}.workspace{padding:28px 0 48px}.two-pane{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(320px,.9fr);gap:20px}.student-layout{display:grid;grid-template-columns:1fr;gap:20px}.tutor-grid{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:20px;align-items:start}.wide{grid-column:1 / -1}.availability-panel{min-width:0}.invite-panel{padding:18px}.panel{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:24px}.section-title{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:20px}.section-title h2{margin:0 0 6px;font-size:22px;letter-spacing:0}.section-title.compact{margin-bottom:14px}.section-title.compact h2{font-size:18px}.section-title.compact p{font-size:13px}.auth-form,.stack{display:grid;gap:16px}label{display:grid;gap:7px;color:var(--text-label);font-size:14px;font-weight:650}input{width:100%;border:1px solid var(--border-strong);background:var(--surface-subtle);color:var(--text);min-height:42px;border-radius:7px;padding:9px 11px;outline:none}input:focus{border-color:var(--accent-strong);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent-strong) 22%,transparent)}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:12px}.primary,.secondary,.slot-row{min-height:42px;border:0;border-radius:7px;display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:750}.primary{background:var(--accent);color:#fff}.secondary{background:var(--surface-muted);color:var(--accent-text)}.full-width{width:100%}.segmented{display:grid;grid-template-columns:1fr 1fr;background:var(--surface-muted);border-radius:8px;padding:4px}.segmented.three{grid-template-columns:repeat(3,minmax(0,1fr))}.segmented button{border:0;min-height:36px;border-radius:6px;background:transparent;color:var(--text-muted);font-weight:700}.segmented .active{background:var(--surface);color:var(--text)}.slot-list,.booking-list,.window-list{display:grid;gap:10px}.week-toolbar{display:grid;grid-template-columns:auto minmax(190px,240px) auto;align-items:end;gap:12px;margin-bottom:16px}.week-slots{display:grid;grid-template-columns:repeat(7,minmax(150px,1fr));gap:12px;overflow-x:auto;padding-bottom:4px}.day-column{min-width:150px;display:grid;align-content:start;gap:8px;border-left:1px solid var(--border);padding-left:10px}.day-column h3{margin:0 0 2px;color:var(--text);font-size:14px;letter-spacing:0}.day-empty{min-height:42px;display:flex;align-items:center;justify-content:center;border:1px dashed var(--border-strong);border-radius:7px;color:var(--text-muted);font-size:13px}.slot-row{width:100%;border:1px solid var(--border);background:var(--surface-subtle);color:var(--text);padding:12px;justify-content:flex-start;transition:transform .14s ease,border-color .14s ease,background .14s ease}.slot-row.compact{min-height:36px;padding:8px;font-size:13px;gap:6px}.slot-row strong{margin-left:auto;color:var(--accent)}.slot-row:hover:not(:disabled){transform:translateY(-1px);border-color:var(--border-hover);background:var(--surface-hover)}.slot-row:disabled{opacity:.5;cursor:not-allowed}.booking-row,.window-row{min-height:56px;display:flex;align-items:center;justify-content:space-between;gap:16px;border-bottom:1px solid var(--border)}.booking-row div{display:grid;gap:3px}.icon-button{width:38px;height:38px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--border);border-radius:7px;background:var(--surface);color:var(--text);text-decoration:none}.danger{color:var(--danger)}.alert{width:min(1180px,calc(100vw - 32px));margin:18px auto 0;background:var(--alert-bg);border:1px solid var(--alert-border);color:var(--alert-text);border-radius:8px;padding:12px 14px}.empty{border:1px dashed var(--border-strong);color:var(--text-muted);border-radius:8px;padding:18px;text-align:center}.date-filter,.date-range-filter{margin-bottom:16px}.date-filter{max-width:220px}.date-range-filter{display:grid;grid-template-columns:repeat(2,minmax(180px,220px));gap:12px}.availability-grid-wrap{overflow:auto;max-height:560px;border:1px solid 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78%,transparent),color-mix(in srgb,var(--surface-muted) 78%,transparent) 5px,color-mix(in srgb,var(--border-strong) 80%,transparent) 5px,color-mix(in srgb,var(--border-strong) 80%,transparent) 8px)}.grid-cell.schedule.break span{color:var(--text-muted);font-weight:700}.grid-cell.empty-slot{background:transparent}.grid-cell.schedule:hover,.grid-cell.readonly:hover{outline:2px solid color-mix(in srgb,var(--accent-strong) 45%,transparent);outline-offset:-2px}.schedule-legend{display:flex;flex-wrap:wrap;gap:10px 16px;margin:0 0 12px;color:var(--text-muted);font-size:13px}.schedule-legend span{display:inline-flex;align-items:center;gap:7px}.legend-mark{width:12px;height:12px;border-radius:3px;border:1px solid var(--border)}.legend-mark.available{background:var(--accent-muted)}.legend-mark.booked{background:var(--warning-bg)}.legend-mark.break{background:repeating-linear-gradient(135deg,color-mix(in srgb,var(--surface-muted) 78%,transparent),color-mix(in srgb,var(--surface-muted) 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9px;font-size:13px;font-weight:750}.status.booked{background:var(--warning-bg);color:var(--warning-text)}.status.available{background:var(--accent-muted);color:var(--accent-text)}.status.past{background:var(--surface-muted);color:var(--text-muted)}.copy-row{margin-top:14px;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px}.copy-row.compact{gap:8px}.copy-row.compact .copy-field{min-height:38px;font-size:12px}.copy-field{margin-top:0}.copy-status{margin:8px 0 0;color:var(--text-muted);font-size:13px}@media(max-width:860px){.topbar{padding:0 16px}.auth-layout,.two-pane,.tutor-grid{grid-template-columns:1fr}.auth-layout{gap:24px;align-items:start;padding:32px 0}.auth-copy h1{font-size:38px}.two-col,.week-toolbar{grid-template-columns:1fr}.week-slots{grid-template-columns:repeat(7,150px)}.date-range-filter,.copy-row{grid-template-columns:1fr}.copy-row.compact{grid-template-columns:minmax(0,1fr) auto}table{display:block;overflow-x:auto}}