:root{--bg:#f1f5f9;--surface:#ffffff;--border:#e2e8f0;--text:#0f172a;--muted:#64748b;--primary:#2563eb;--primary-dark:#1d4ed8;--danger:#dc2626;--sun:#dc2626;--sat:#2563eb;--radius:12px;--shadow:0 1px 3px rgba(15,23,42,0.08),0 8px 24px rgba(15,23,42,0.06)}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:Noto Sans Thai,Sarabun,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;-webkit-font-smoothing:antialiased}h1,h2,h3,h4,p{margin:0}.page{min-height:100vh}.container{max-width:1080px;margin:0 auto;padding:24px 16px 64px}.topbar{justify-content:space-between;background:var(--surface);border-bottom:1px solid var(--border);padding:16px 24px;position:-webkit-sticky;position:sticky;top:0;z-index:10}.brand,.topbar{display:flex;align-items:center}.brand{gap:14px}.brand .logo{font-size:28px}.brand h1{font-size:20px;font-weight:700}.sub{color:var(--muted);font-size:13px}.btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid var(--border);background:var(--surface);color:var(--text);padding:8px 14px;border-radius:10px;cursor:pointer;font-size:14px;font-family:inherit;transition:background .15s,border-color .15s}.btn:hover{background:#f8fafc}.btn.primary{background:var(--primary);border-color:var(--primary);color:#fff}.btn.primary:hover{background:var(--primary-dark)}.btn.primary:disabled{opacity:.6;cursor:not-allowed}.btn.danger{color:var(--danger);border-color:#fecaca;background:#fef2f2}.btn.danger:hover{background:#fee2e2}.btn.sm{padding:5px 10px;font-size:13px}.btn.block{width:100%;margin-top:4px}.icon-btn{border:none;background:none;cursor:pointer;font-size:18px;color:var(--muted);line-height:1}.calendar{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}.cal-toolbar{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border)}.cal-title{font-size:18px;font-weight:700}.cal-nav{display:flex;gap:8px}.cal-grid{display:grid;grid-template-columns:repeat(7,minmax(0,1fr))}.cal-dow{border-bottom:1px solid var(--border);background:#f8fafc}.dow{text-align:center;padding:10px 0;font-size:13px;font-weight:600;color:var(--muted)}.dow.sun{color:var(--sun)}.dow.sat{color:var(--sat)}.cell{min-height:104px;border-right:1px solid var(--border);border-bottom:1px solid var(--border);padding:6px;display:flex;flex-direction:column;gap:4px}.cell:nth-child(7n){border-right:none}.cell.empty{background:#fafbfc}.cell.today{background:#eff6ff}.cell-head{display:flex;align-items:center;justify-content:space-between;min-height:24px}.daynum{font-size:13px;font-weight:600;width:24px;height:24px;display:inline-flex;align-items:center;justify-content:center}.cell.today .daynum{background:var(--primary);color:#fff!important;border-radius:50%}.daynum.sun{color:var(--sun)}.daynum.sat{color:var(--sat)}.pencil{border:none;background:none;cursor:pointer;font-size:13px;opacity:.55;padding:2px;border-radius:6px;line-height:1}.pencil:hover{opacity:1;background:#e2e8f0}.chips{display:flex;flex-direction:column;gap:3px;min-width:0}.chip{text-align:left;border:none;border-left:3px solid var(--primary);background:#f1f5f9;padding:3px 6px;border-radius:5px;font-size:12px;line-height:1.35;cursor:pointer;white-space:normal;overflow-wrap:anywhere;word-break:break-word;font-family:inherit;color:var(--text)}.chip:hover{background:#e2e8f0}.cal-loading{padding:10px}.cal-loading,.hint{text-align:center;color:var(--muted);font-size:13px}.hint{margin-top:16px}.cal-list{display:none;flex-direction:column}.day-row{display:flex;gap:12px;padding:12px 14px;border-bottom:1px solid var(--border)}.day-row:last-child{border-bottom:none}.day-row.today{background:#eff6ff}.day-row.is-empty{padding-top:8px;padding-bottom:8px}.day-row-date{flex:none;width:44px;display:flex;flex-direction:column;align-items:center;gap:2px}.dr-dow{font-size:12px;font-weight:600;color:var(--muted)}.dr-num{font-size:19px;font-weight:700;width:36px;height:36px;display:inline-flex;align-items:center;justify-content:center}.day-row-date.sun .dr-dow,.day-row-date.sun .dr-num{color:var(--sun)}.day-row-date.sat .dr-dow,.day-row-date.sat .dr-num{color:var(--sat)}.day-row.today .dr-num{background:var(--primary);color:#fff!important;border-radius:50%}.day-row-body{flex:1 1;min-width:0;display:flex;flex-direction:column;justify-content:center;gap:5px}.day-row-body .chip{padding:8px 10px;font-size:14px;border-radius:8px;border-left-width:4px}.dr-empty{color:#cbd5e1;font-size:15px}.dr-edit{flex:none;align-self:center;font-size:16px}.modal-backdrop{position:fixed;inset:0;background:rgba(15,23,42,.45);display:flex;align-items:center;justify-content:center;padding:16px;z-index:50}.modal{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);width:100%;max-width:460px;max-height:90vh;overflow:auto}.modal.modal-lg{max-width:560px}.modal-head{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border)}.modal-head h3{font-size:17px}.modal-body{padding:20px}.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:8px}.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}.field>span{font-size:13px;font-weight:600;color:var(--muted)}.field input,.field textarea,select{font-family:inherit;font-size:14px;padding:10px 12px;border:1px solid var(--border);border-radius:10px;background:var(--surface);color:var(--text);width:100%}.field input:focus,.field textarea:focus,select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.12)}.field input[type=color]{padding:4px;height:42px}.course-color{height:6px;border-radius:99px;margin-bottom:14px}.course-desc{white-space:pre-wrap;line-height:1.6;word-break:break-word}.course-desc a{color:var(--primary);text-decoration:underline}.course-desc a:hover{color:var(--primary-dark)}.day-editor h4{font-size:14px;margin-bottom:8px}.day-editor ul{list-style:none;padding:0;margin:0 0 16px;display:flex;flex-direction:column;gap:6px}.day-editor li{display:flex;align-items:center;gap:10px;padding:8px 10px;background:#f8fafc;border:1px solid var(--border);border-radius:10px}.grow{flex:1 1;min-width:0}.dot{width:12px;height:12px;border-radius:50%;flex:none}.add-row{display:flex;gap:10px}.add-row select{flex:1 1}.muted{color:var(--muted);font-size:13px}.course-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px 20px;margin-bottom:24px}.course-bar-info{display:flex;align-items:baseline;gap:10px;min-width:0}.course-bar-info h2{font-size:17px}.course-bar-actions{display:flex;gap:8px;flex:none}.cm-toolbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}.cm-list{display:flex;flex-direction:column;gap:8px}.cm-list-scroll{max-height:55vh;overflow-y:auto}.cm-item{display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid var(--border);border-radius:10px}.cm-name{font-weight:600;font-size:14px}.cm-desc{font-size:13px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.center-screen{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:16px}.login-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:32px;width:100%;max-width:380px}.login-card h1{font-size:22px;margin-bottom:4px}.login-card .sub{margin-bottom:20px}.error{background:#fef2f2;color:var(--danger);border:1px solid #fecaca;padding:10px 12px;border-radius:10px;font-size:13px;margin-bottom:14px}@media (max-width:640px){.cal-month{display:none}.cal-list{display:flex}.cell{min-height:78px}.chip{font-size:11px}.brand h1{font-size:17px}.topbar{padding:12px 16px}}