:root{
      --bg:#f3f6f8;--paper:#ffffff;--ink:#15202b;--muted:#52616f;--line:#d7e0e5;
      --navy:#123a5a;--navy-2:#0a2942;--blue:#146c94;--blue-soft:#e8f4f8;
      --gold:#e1a928;--gold-soft:#fff5d8;--danger:#a12b2b;--danger-soft:#fff0ef;
      --success:#20683a;--success-soft:#eaf7ef;--shadow:0 12px 34px rgba(19,48,69,.08);
      --radius:14px;color-scheme:light dark;
    }
    @media(prefers-color-scheme:dark){
      :root{--bg:#0d161d;--paper:#14232e;--ink:#edf4f7;--muted:#b2c2cb;--line:#304553;
      --navy:#8fcbe6;--navy-2:#06131c;--blue:#61b4d8;--blue-soft:#173746;--gold:#f2c14e;
      --gold-soft:#3a3018;--danger:#ff9d96;--danger-soft:#3b2223;--success:#80d59c;--success-soft:#163526;
      --shadow:0 14px 38px rgba(0,0,0,.28)}
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;background:var(--bg);color:var(--ink);font-family:"Noto Sans","Noto Sans SC","Segoe UI",system-ui,sans-serif;line-height:1.55}
    button,input,select{font:inherit}button{cursor:pointer}
    button:focus-visible,input:focus-visible,select:focus-visible,a:focus-visible{outline:3px solid color-mix(in srgb,var(--gold) 72%,transparent);outline-offset:2px}
    .online-banner{background:var(--navy-2);color:#fff;text-align:center;font-weight:750;padding:12px 18px;letter-spacing:.01em}
    .online-banner svg{width:18px;height:18px;vertical-align:-3px;margin-right:8px;color:#85d8ee}
    .hero{background:var(--paper);border-bottom:1px solid var(--line)}
    .hero-inner{width:min(1120px,calc(100% - 32px));margin:auto;padding:30px 0;display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:28px}.hero-main{display:flex;align-items:center;gap:22px;min-width:0}.school-logo{width:104px;height:104px;object-fit:contain;flex:0 0 auto}.hero-copy{min-width:0}.hero-side{display:flex;flex-direction:column;align-items:stretch;gap:12px}.language-control{display:flex;align-items:center;justify-content:flex-end;gap:9px}.language-control label{font-size:.82rem;font-weight:800;color:var(--muted)}.language-control select{min-height:40px;border:1px solid var(--line);border-radius:8px;background:var(--paper);color:var(--ink);padding:7px 32px 7px 10px}
    h1{margin:0;font-family:Georgia,"Noto Serif SC",serif;font-size:clamp(2rem,5vw,3.6rem);line-height:1.06;color:var(--navy);letter-spacing:-.03em}
    .lede{margin:12px 0 0;color:var(--muted);font-size:1.02rem}
    .date-card{min-width:220px;padding:17px 20px;border:1px solid var(--line);border-radius:10px;background:var(--bg)}
    .date-card span{display:block;font-size:.78rem;font-weight:800;color:var(--muted);text-transform:uppercase;letter-spacing:.08em}
    .date-card strong{display:block;margin-top:5px;color:var(--ink);font-size:1.12rem}
    main{width:min(1120px,calc(100% - 32px));margin:30px auto 64px}
    .step{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:20px;overflow:visible}
    .step-head{display:flex;align-items:flex-start;gap:15px;padding:24px 26px 0}
    .step-no{flex:0 0 auto;display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--navy);color:var(--paper);font-weight:850}
    .step-title{margin:0;font-size:1.25rem;line-height:1.25;color:var(--ink)}
    .step-sub{margin:5px 0 0;color:var(--muted);font-size:.92rem}
    .step-body{padding:20px 26px 26px}
    .field label,.field-label{display:block;font-weight:760;margin-bottom:8px}.required{color:var(--danger)}
    .invite-wrap{max-width:640px}.invite-actions{display:flex;justify-content:flex-end;margin-top:16px}.invite-actions .primary{min-width:180px}
    input{width:100%;min-height:48px;border:1px solid var(--line);border-radius:9px;background:var(--paper);color:var(--ink);padding:11px 13px}
    input::placeholder{color:var(--muted);opacity:.75}input:focus{border-color:var(--blue)}
    .student-verify{max-width:640px;display:grid;gap:17px}.combobox{position:relative}.combo-wrap{position:relative}.combo-wrap svg{position:absolute;right:14px;top:50%;transform:translateY(-50%);width:19px;color:var(--muted);pointer-events:none}#studentInput{padding-right:44px}.field-hint{margin:7px 0 0;color:var(--muted);font-size:.84rem}.student-actions{display:flex;justify-content:flex-end}.student-actions .primary{min-width:180px}
    .listbox{position:absolute;z-index:20;top:calc(100% + 6px);left:0;right:0;max-height:290px;overflow-y:auto;background:var(--paper);border:1px solid var(--line);border-radius:10px;box-shadow:0 14px 36px rgba(0,0,0,.18);padding:6px}
    .option{width:100%;text-align:left;border:0;background:transparent;color:var(--ink);padding:10px 11px;border-radius:7px}.option:hover,.option.active{background:var(--blue-soft);color:var(--blue)}.empty-option{padding:12px;color:var(--muted)}
    .alert{margin-top:15px;border-radius:9px;padding:12px 14px;background:var(--danger-soft);color:var(--danger);font-weight:650}.alert.success{background:var(--success-soft);color:var(--success)}[hidden]{display:none!important}
    .teachers{display:grid;gap:18px}.teacher-card{border-top:4px solid var(--blue);background:var(--bg);border-radius:9px;padding:20px}.teacher-top{display:flex;justify-content:space-between;gap:16px;align-items:start;margin-bottom:17px}
    .teacher-name{margin:0;font-family:Georgia,"Noto Serif SC",serif;color:var(--navy);font-size:1.42rem}.course-list{display:flex;flex-wrap:wrap;gap:7px;margin:9px 0 0;padding:0;list-style:none}.course{padding:5px 9px;border-radius:6px;background:var(--paper);border:1px solid var(--line);font-size:.85rem;color:var(--muted)}.course b{color:var(--ink)}
    .selected-summary{font-size:.84rem;color:var(--success);font-weight:780;min-width:140px;text-align:right;padding-top:4px}.slots{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:8px}.slot{border:1px solid var(--line);border-radius:7px;background:var(--paper);color:var(--ink);padding:10px 6px;font-size:.84rem;line-height:1.2;min-height:43px}.slot:hover{border-color:var(--blue);color:var(--blue)}.slot.selected{background:var(--navy);border-color:var(--navy);color:var(--paper);font-weight:800}.teacher-note{margin:14px 0 0;color:var(--muted);font-size:.86rem}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:17px}.field.phone{grid-column:1/-1;max-width:50%}.form-error{margin:18px 0 0}.submit-row{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-top:22px;padding-top:20px;border-top:1px solid var(--line)}.submit-row p{margin:0;color:var(--muted);font-size:.86rem;max-width:580px}
    .primary,.secondary,.text-button{border:0;border-radius:8px;min-height:48px;padding:11px 20px;font-weight:820;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:9px}.primary{background:var(--navy);color:var(--paper)}.primary:hover{background:var(--blue)}.secondary{background:var(--blue-soft);color:var(--blue);border:1px solid color-mix(in srgb,var(--blue) 32%,var(--line))}.secondary:hover{background:var(--paper)}button:disabled{cursor:not-allowed;opacity:.52}
    .confirm{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}.confirm-head{padding:30px 30px 26px;background:var(--navy);color:var(--paper)}.confirm-head .check{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:color-mix(in srgb,var(--paper) 18%,transparent);margin-bottom:14px}.confirm-head h2{font-family:Georgia,"Noto Serif SC",serif;font-size:1.8rem;margin:0 0 5px}.confirm-head p{margin:0;opacity:.9}.booking-id{margin-left:4px;font-weight:900;letter-spacing:.07em}
    .confirm-body{padding:28px 30px}.confirmation-cue{padding:12px 14px;border-radius:8px;background:var(--gold-soft);color:var(--ink);margin-bottom:24px}.confirmation-cue strong{color:var(--navy)}h3{font-size:1.08rem;margin:0 0 12px}table{width:100%;border-collapse:collapse;margin-bottom:26px}th,td{text-align:left;padding:12px 10px;border-bottom:1px solid var(--line);vertical-align:top}th{font-size:.8rem;color:var(--muted);letter-spacing:.04em;text-transform:uppercase}td{font-size:.93rem}
    .zoom-section{background:var(--blue-soft);border-radius:10px;padding:20px;margin:4px 0 24px}.zoom-section>h3{color:var(--navy);display:flex;align-items:center;gap:9px}.zoom-meetings{display:grid;gap:12px;margin:16px 0}.zoom-meeting{background:var(--paper);border-radius:8px;padding:15px}.zoom-meeting h4{margin:0 0 10px;color:var(--navy);font-size:1rem}.zoom-data{display:grid;grid-template-columns:minmax(0,1.5fr) 1fr .8fr;gap:12px}.zoom-item span{display:block;color:var(--muted);font-size:.78rem;margin-bottom:3px}.zoom-item strong,.zoom-item a{word-break:break-word;color:var(--ink)}.zoom-item a{color:var(--blue);font-weight:750}.zoom-section>p{margin:0;color:var(--ink)}
    .actions{display:grid;grid-template-columns:1fr 1fr;gap:12px}.action-note{color:var(--muted);font-size:.84rem;margin:7px 0 0}.action-block{display:flex;flex-direction:column}.final-note{margin:24px 0 0;padding-top:20px;border-top:1px solid var(--line);color:var(--muted);font-size:.88rem}.reset-row{text-align:center;margin-top:20px}.text-button{background:transparent;color:var(--blue);min-height:auto;padding:8px 12px}.footnote{text-align:center;color:var(--muted);font-size:.8rem;margin-top:24px}
    @media(max-width:800px){.hero-inner{grid-template-columns:1fr;padding:24px 0}.hero-main{align-items:flex-start}.hero-side{width:100%}.language-control{justify-content:flex-start}.date-card{width:100%;min-width:0}.slots{grid-template-columns:repeat(3,minmax(0,1fr))}.teacher-top{display:block}.selected-summary{text-align:left;padding-top:9px}.zoom-data{grid-template-columns:1fr}.actions{grid-template-columns:1fr}}
    @media(max-width:560px){.online-banner{font-size:.86rem}.hero-main{gap:14px}.school-logo{width:74px;height:74px}h1{font-size:clamp(1.85rem,10vw,2.6rem)}.hero-inner,main{width:min(100% - 22px,1120px)}main{margin-top:18px}.step-head{padding:20px 17px 0}.step-body{padding:17px}.step-no{width:30px;height:30px}.teacher-card{padding:15px}.slots{grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}.slot{font-size:.8rem;padding:9px 4px}.form-grid{grid-template-columns:1fr}.field.phone{grid-column:auto;max-width:none}.invite-actions,.student-actions{justify-content:stretch}.invite-actions .primary,.student-actions .primary{width:100%}.submit-row{align-items:stretch;flex-direction:column}.submit-row .primary{width:100%}.confirm-head,.confirm-body{padding:23px 18px}table,thead,tbody,tr,th,td{display:block}thead{position:absolute;left:-9999px}tr{border-bottom:1px solid var(--line);padding:9px 0}td{border:0;padding:3px 0 3px 40%;position:relative;min-height:28px}td:before{position:absolute;left:0;width:38%;font-size:.77rem;font-weight:800;color:var(--muted)}td:before{content:attr(data-label)}}
    @media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
    .birth-wrap{position:relative}.birth-wrap input{padding-right:46px}.birth-picker{position:absolute;right:6px;top:50%;transform:translateY(-50%);width:34px;height:34px;border:0;background:transparent;color:var(--muted);cursor:pointer;display:flex;align-items:center;justify-content:center;border-radius:8px}.birth-picker:hover{background:rgba(128,128,128,.14);color:var(--ink)}.birth-picker:focus-visible{outline:2px solid var(--gold);outline-offset:1px}
    .confirm-actions{display:flex;gap:12px}.confirm-actions .primary{flex:1}.submit-status.ok{background:var(--success-soft);color:var(--success)}.submit-status.err{background:var(--danger-soft);color:var(--danger)}@media(max-width:560px){.confirm-actions{flex-direction:column}.confirm-actions .primary{width:100%}}
    .slot.occupied{opacity:.42;cursor:not-allowed;background:var(--line);color:var(--muted);text-decoration:line-through}
    .slot.conflict{background:var(--danger-soft);color:var(--danger);border:2px solid var(--danger);opacity:1;text-decoration:none;font-weight:820}
    .already-booked{margin-top:1rem;padding:1.4rem 1.5rem;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg)}
    .already-booked h3{margin:0 0 .5rem;font-size:1.18rem;color:var(--navy)}
    .already-booked p{margin:.4rem 0;color:var(--ink)}
    .already-booked .booking-id{font-weight:850;color:var(--navy);font-size:1.05rem}
    .booked-notice{display:flex;gap:.6rem;align-items:flex-start;margin-top:1rem;padding:1rem 1.15rem;border:1px solid var(--gold);border-left:6px solid var(--gold);border-radius:var(--radius);background:var(--gold-soft);color:var(--navy-2);font-weight:760}
    .slot.parent-booked{background:var(--success-soft);color:var(--success);border:2px solid var(--success);opacity:1;text-decoration:none;font-weight:700;cursor:not-allowed}
    .slot .slot-owner{display:block;font-size:.72rem;font-weight:700;color:var(--success);margin-top:2px}
    .slot.self-clash{background:var(--danger-soft);color:var(--danger);border:2px solid var(--danger);opacity:1;text-decoration:none;font-weight:700;cursor:not-allowed}