:root{font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC",Arial,sans-serif;color:#162638;background:#f5f7fb;--border:#dfe6ef;--muted:#68788d;--brand:#266de2;--white:#fff;--green:#e4f6eb;--red:#fce7eb;--orange:#fff0d6}
*{box-sizing:border-box}body{margin:0;background:linear-gradient(145deg,#eff4fd 0,#fbfcff 50%,#f7fafc 100%);min-height:100vh}button,input,textarea,select{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}a{color:#2266d8;text-decoration:none}button:focus-visible,input:focus-visible{outline:3px solid #91b8ff;outline-offset:2px}
.shell{max-width:1190px;margin:auto;padding:26px 22px 60px}.mast{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:24px}.logo{display:flex;align-items:center;gap:12px;font-size:16px;font-weight:800}.symbol{background:#1d4f9b;color:white;border-radius:13px;width:44px;height:44px;display:grid;place-items:center;font-weight:900;font-size:19px}.eyebrow{font-size:11px;letter-spacing:2px;text-transform:uppercase;color:#77869d;font-weight:800}.muted{color:var(--muted)}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(24px,3.5vw,34px);letter-spacing:-.8px;margin-bottom:7px}h2{font-size:19px;margin-bottom:10px}h3{font-size:16px;margin:0 0 12px}
.card{background:white;border:1px solid #e2e8f1;border-radius:20px;box-shadow:0 8px 26px #18346408;padding:22px}.auth-wrap{display:grid;place-items:center;min-height:80vh}.auth-card{width:min(100%,430px);padding:34px}.auth-card h1{font-size:27px;margin-top:24px}.auth-card p{line-height:1.6}.stack{display:grid;gap:14px}label{font-size:13px;font-weight:700;color:#32455d;display:block;margin-bottom:6px}input,textarea,select{width:100%;border:1px solid #cdd8e6;border-radius:10px;padding:12px 13px;background:#fff;color:#172638;min-width:0}textarea{min-height:90px;resize:vertical}.btn{border:1px solid #cdd8e7;border-radius:10px;padding:11px 16px;background:white;color:#344764;font-weight:750}.btn:hover:not(:disabled){filter:brightness(.97)}.btn.primary{background:#246be2;color:#fff;border-color:#246be2}.btn.danger{background:#fff3f3;border-color:#f3bfc5;color:#b53b46}.btn.small{padding:8px 12px;font-size:12px}.btn.full{width:100%}.actions{display:flex;gap:9px;flex-wrap:wrap;align-items:center}.hidden{display:none!important}.error{color:#b03040;font-size:13px;min-height:18px}.success{color:#15804b}.pill{display:inline-flex;align-items:center;border-radius:30px;padding:6px 11px;background:#eef3fa;color:#50637d;font-size:12px;font-weight:750}.pill.orange{background:#fff0d3;color:#a46a0e}.pill.green{background:#e1f7ec;color:#157346}.pill.red{background:#ffe4e8;color:#b33e55}.pill.gray{background:#eaf0f6;color:#56687c}
.headline{display:flex;justify-content:space-between;gap:15px;align-items:flex-start;margin-bottom:24px}.stats{display:flex;gap:9px;flex-wrap:wrap}.stat{background:#fff;border:1px solid #e2e8f1;border-radius:13px;padding:12px 16px;min-width:125px}.stat strong{font-size:23px;display:block}.stat small{font-size:11px;color:var(--muted)}.cols{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(325px,.85fr);gap:18px;align-items:start}.col{display:grid;gap:18px}.month-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:18px}.month-head strong{font-size:18px}.nav{display:flex;align-items:center;gap:10px}.nav button{background:#f3f7fc;border:1px solid var(--border);border-radius:10px;padding:7px 14px;font-size:19px}.weekrow,.monthgrid{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:6px}.weekrow{font-size:11px;color:#8996a6;text-align:center;font-weight:800;margin-bottom:7px}.cal-day{border:1px solid #e4eaf2;border-radius:11px;background:#f9fbff;min-height:68px;text-align:left;padding:10px 7px;display:flex;flex-direction:column;justify-content:space-between;align-items:start;color:#31485f;font-weight:700}.cal-day.active{border:2px solid #3173e7;background:#edf5ff;padding:9px 6px}.cal-day.other{visibility:hidden}.cal-day .markers{display:flex;gap:3px;flex-wrap:wrap}.marker{width:7px;height:7px;border-radius:100%;background:#a4c5f6}.marker.green{background:#38a773}.marker.red{background:#ea7684}.marker.orange{background:#f6b544}.marker.blue{background:#3679d6}.legend{display:flex;gap:14px;flex-wrap:wrap;font-size:11px;color:#586b80;margin:10px 0 17px}.legend b{display:inline-block;width:10px;height:10px;border-radius:4px;margin-right:4px;background:#ddd}.timeline{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px;max-height:600px;overflow:auto;padding:3px}.slot{min-height:48px;border:1px solid transparent;border-radius:9px;display:flex;align-items:center;justify-content:space-between;gap:4px;padding:7px 10px;text-align:left;font-size:13px;font-weight:700}.slot em{font-size:10px;font-style:normal;font-weight:650}.slot.red{background:#fcecef;color:#b65a68;cursor:not-allowed}.slot.green{background:#e5f7ed;color:#176f4c;border-color:#c6e9d5}.slot.own{background:#e7edff;color:#264d96;border-color:#b4cfff}.slot.selected{background:#2367db;color:#fff;border-color:#2367db}.slot.pending{background:#fff0d7;color:#985f0e;border-color:#f7d899}.slot:disabled{opacity:1}.slot:hover:not(:disabled){filter:brightness(.96)}.request{border:1px solid var(--border);background:#fff;border-radius:13px;padding:14px;margin-top:10px}.request .top{display:flex;justify-content:space-between;gap:10px;align-items:start}.request strong{font-size:14px}.request .meta{font-size:12px;line-height:1.7;color:#65748a;margin-top:6px}.request .reason{background:#fdf0f2;color:#aa3249;border-radius:9px;padding:9px;margin-top:8px;font-size:12px}.request .actions{margin-top:10px}.note{font-size:12px;line-height:1.6;color:#65758a}.divider{border-top:1px solid #e6ebf2;margin:18px 0}.modal-back{position:fixed;inset:0;background:#101c32a3;z-index:10;display:grid;place-items:center;padding:18px}.modal{background:white;border-radius:20px;padding:24px;width:min(96vw,510px);max-height:86vh;overflow:auto;box-shadow:0 18px 65px #162a4f44}.modal h2{margin:0 0 12px}.toast{position:fixed;z-index:20;bottom:20px;left:50%;transform:translateX(-50%);background:#192b46;color:white;border-radius:12px;padding:13px 19px;box-shadow:0 9px 30px #101c3260;max-width:90vw;font-size:13px}.teacher-grid{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(290px,.85fr);gap:18px}.account{display:flex;justify-content:space-between;gap:8px;padding:10px 0;border-bottom:1px solid #eef1f5;font-size:13px}.account span{color:#657789;font-size:12px}.request-list{max-height:760px;overflow:auto}.mini{font-size:11px;color:#78879a}.hero-notice{background:#fff7e8;border:1px solid #f5dfb0;color:#855a1b;padding:12px;border-radius:12px;font-size:12px;line-height:1.7;margin-bottom:16px}
@media(max-width:830px){.cols,.teacher-grid{grid-template-columns:1fr}.headline{flex-direction:column}.shell{padding:15px 12px 35px}.card{padding:17px}.cal-day{min-height:56px;padding:7px 5px;font-size:12px}.cal-day.active{padding:6px 4px}.monthgrid,.weekrow{gap:3px}.slot{padding:8px;font-size:12px}.mast{margin-bottom:20px}.auth-card{padding:24px}.stats{width:100%}.stat{flex:1;min-width:90px}}

/* v0.4.1: instantly recognizable booking availability on both month views. */
.cal-day.day-free{background:#e0f7e8;border:1px solid #8ed0a6;color:#12663b;font-weight:800}
.cal-day.day-full{background:#ffe8eb;border:1px solid #efb3bd;color:#a23748;font-weight:800}
.cal-day.active{outline:3px solid #2567df;outline-offset:-3px}

/* Student online cancellation lock: still click/focusable for explanation. */
.btn.cancel-locked,.btn.cancel-locked:hover{background:#e6e9ee;color:#8290a1;border-color:#d3d9e1;cursor:not-allowed;opacity:.80;filter:none}
.btn.cancel-locked:focus-visible{outline:3px solid #8290a1}

.cal-day.day-past{background:#eceef1;color:#737b87;border-color:#d9dde3}
.cal-day.day-past.active{outline-color:#848d9b}
.cal-day.day-past .marker{background:#9ba3af!important}

.has-update{position:relative}.has-update::after{content:"";display:inline-block;width:8px;height:8px;border-radius:50%;background:#e13d4d;margin-left:6px;vertical-align:top}.email-choice{display:flex;gap:9px;align-items:center;font-size:13px;line-height:1.6}.email-choice input[type=checkbox]{width:17px;min-height:auto;padding:0;flex:0 0 17px}

.request:has(.course-navigation){position:relative;padding-bottom:64px}.request .course-navigation{position:absolute;right:16px;bottom:14px;max-width:calc(100% - 32px);text-align:right;text-decoration:none}

.request.linked-request{border:2px solid #397cdd;box-shadow:0 0 0 4px #397cdd14}