:root{--navy:#143846;--navy2:#0c2833;--teal:#087c78;--mint:#e4f4f1;--text:#213946;--muted:#637b88;--bg:#f2f6f8;--border:#dce7ec;--white:#fff;--red:#b43849;--green:#107458;--shadow:0 13px 40px rgba(15,50,65,.07)}
*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--text);background:var(--bg);min-height:100vh}button,input,textarea,select{font:inherit}button{cursor:pointer}a{color:var(--teal)}button:disabled{opacity:.5;cursor:not-allowed}button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #2caaa2;outline-offset:2px}.site-header{background:#fff;border-bottom:1px solid var(--border)}.top-inner{max-width:1150px;margin:auto;display:flex;justify-content:space-between;align-items:center;gap:20px;padding:14px 22px}.brand{text-decoration:none;color:var(--navy);font-size:19px;font-weight:750;display:flex;align-items:center;gap:10px}.brand b{color:var(--teal)}.mark{background:var(--navy);display:grid;place-items:center;color:#fff;width:37px;height:37px;border-radius:10px;font-size:28px}.top-right{display:flex;align-items:center;gap:15px}.network{font-size:12px;color:var(--muted)}.dot{display:inline-block;width:7px;height:7px;border-radius:100%;background:#0aa67c;margin-right:6px}.nav-btn{border:1px solid var(--border);background:white;border-radius:9px;padding:9px 14px;color:var(--navy)}.wrap{max-width:1150px;margin:0 auto;padding:34px 20px 45px;min-height:78vh}.narrow{max-width:560px;margin:18px auto}.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:24px;align-items:stretch;margin-top:20px}.hero-left{padding:40px 10px}.eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:1.7px;color:var(--teal);font-weight:800}.hero-title{font-size:clamp(33px,5vw,59px);line-height:1.08;letter-spacing:-2.4px;margin:14px 0 19px;color:var(--navy2)}.lede{font-size:17px;line-height:1.65;color:var(--muted);max-width:580px}.hero-preview{border-radius:22px;background:linear-gradient(145deg,#103846,#0b6b69);color:white;min-height:330px;padding:32px;display:flex;flex-direction:column;justify-content:space-between;box-shadow:var(--shadow)}.hero-preview .preview-code{font-size:47px;letter-spacing:6px;font-weight:820;margin:10px 0}.preview-mini{background:rgba(255,255,255,.12);border-radius:12px;padding:15px}.preview-bar{background:rgba(255,255,255,.2);height:12px;border-radius:10px;overflow:hidden;margin-top:8px}.preview-bar i{display:block;background:#70ded0;height:100%;width:65%}.panel{border:1px solid var(--border);background:#fff;border-radius:18px;box-shadow:var(--shadow);padding:26px}.panel + .panel{margin-top:18px}.panel h1,.panel h2,.panel h3{margin-top:0}.panel h1{font-size:30px;letter-spacing:-.6px}.panel h2{font-size:23px;letter-spacing:-.4px}.panel h3{font-size:18px}.card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.stack{display:flex;flex-direction:column;gap:16px}.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.between{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}.button{background:var(--teal);border:1px solid var(--teal);color:white;border-radius:11px;padding:12px 18px;font-weight:750;min-height:44px;display:inline-flex;gap:8px;align-items:center;justify-content:center}.button:hover{filter:brightness(.94)}.button.alt{background:#f0f7f7;border-color:#d0e5e4;color:#165960}.button.ghost{background:#fff;border-color:var(--border);color:var(--navy)}.button.danger{background:#fff2f3;border-color:#f4c5cb;color:var(--red)}.button.wide{width:100%}.button.small{padding:8px 11px;min-height:36px;font-size:13px}.field{display:flex;flex-direction:column;gap:7px}.field>span{font-weight:700;font-size:14px}.field input,.field select,.field textarea{width:100%;border:1px solid #bfcfd7;border-radius:10px;background:#fff;color:var(--navy);padding:12px 13px;font-size:16px}.field textarea{min-height:104px;resize:vertical}.muted{color:var(--muted)}.tiny{font-size:12px;color:var(--muted);line-height:1.5}.smalltext{font-size:14px;color:var(--muted);line-height:1.5}.lead-header{margin-bottom:20px}.divider{height:1px;background:var(--border);margin:18px 0}.radio-card{border:1px solid var(--border);border-radius:12px;padding:14px;display:flex;gap:12px;align-items:start;background:#fcfefe;cursor:pointer}.radio-card input{margin-top:4px;accent-color:var(--teal)}.radio-card strong{display:block}.radio-card small{display:block;color:var(--muted);line-height:1.5;margin-top:3px}.check-row{display:flex;gap:10px;align-items:center;font-size:14px}.check-row input{width:18px;height:18px;accent-color:var(--teal)}.two-column{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.3fr);gap:18px}.stat-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:11px}.stat{padding:16px 8px;border:1px solid var(--border);border-radius:12px;text-align:center;background:#f8fbfc}.stat strong{font-size:30px;color:var(--navy);display:block}.stat span{font-size:12px;color:var(--muted)}.pill{border-radius:50px;padding:5px 10px;display:inline-block;font-size:12px;font-weight:750;background:var(--mint);color:#066b61}.pill.gray{background:#eef2f4;color:#516975}.join-code{font-size:45px;letter-spacing:4px;font-weight:820;color:var(--navy);margin:4px 0}.question-block{background:#f7fafb;border-radius:12px;padding:18px}.question-block h3{font-size:19px;line-height:1.5;margin:0 0 13px}.results{display:flex;flex-direction:column;gap:12px;margin-top:16px}.result-label{display:flex;justify-content:space-between;gap:8px;font-size:14px;margin-bottom:5px}.bar{height:12px;border-radius:8px;background:#e6eef2;overflow:hidden}.bar-inner{background:var(--teal);height:100%;min-width:0;transition:width .25s}.table-scroll{overflow-x:auto}.responses-table{width:100%;border-collapse:collapse;font-size:14px}.responses-table th,.responses-table td{text-align:left;padding:9px;border-bottom:1px solid var(--border);vertical-align:top;overflow-wrap:anywhere}.responses-table th{font-size:12px;color:var(--muted);text-transform:uppercase}.answers{display:flex;flex-direction:column;gap:8px}.answer-option{display:flex;gap:10px;align-items:start;border:1px solid var(--border);border-radius:12px;padding:14px;cursor:pointer}.answer-option:has(input:checked){background:var(--mint);border-color:#7dbbb6}.answer-option input{accent-color:var(--teal);margin-top:4px}.notice{padding:12px 14px;border-radius:11px;background:#e8f6f3;border:1px solid #bde5db;color:#136458;font-size:14px;line-height:1.5}.notice.bad{background:#fff0f0;border-color:#f4cad0;color:#982d3e}.notice.good{background:#e8f6f3}.teacher-header{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:13px;margin-bottom:20px}.teacher-header h1{margin:5px 0;color:var(--navy)}.actions{display:flex;gap:8px;flex-wrap:wrap}.loading{padding:70px;text-align:center;color:var(--muted)}.toast{position:fixed;bottom:22px;right:22px;background:#143846;color:white;border-radius:11px;padding:15px 18px;box-shadow:0 12px 35px #0002;max-width:400px;z-index:10}.toast[hidden]{display:none}.footer{max-width:1150px;margin:0 auto;padding:22px;color:var(--muted);font-size:12px;text-align:center}.empty{text-align:center;padding:30px 10px;color:var(--muted)}.response-form{margin-top:18px}.label-strong{font-weight:750}.student-area{max-width:760px;margin:0 auto}.waiting{padding:40px;text-align:center}.waiting .spinner{font-size:33px}.group{display:flex;flex-direction:column;gap:6px}.session-note{padding:13px;border-radius:12px;background:#eef6f7;color:#345c66;font-size:13px}.question-meta{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:15px}
@media(max-width:760px){.hero-grid,.two-column,.card-grid{grid-template-columns:1fr}.hero-left{padding:10px 0}.hero-preview{min-height:250px}.network{display:none}.top-inner{padding:12px 14px}.wrap{padding:20px 13px 35px}.panel{padding:20px}.hero-title{letter-spacing:-1.2px}.join-code{font-size:38px}.stat strong{font-size:24px}}

/* Drawing / Whiteboard Response */
.drawing-options{padding:14px;border:1px solid var(--border);border-radius:12px;background:#f8fbfc;display:grid;gap:12px}
.board-editor{border:1px solid var(--border);border-radius:14px;overflow:hidden;background:#f8fbfc;margin-top:12px}
.board-toolbar{display:flex;gap:7px;align-items:center;flex-wrap:wrap;padding:12px;background:#f6fafb;border-bottom:1px solid var(--border)}
.board-tool{padding:8px 10px;border:1px solid #c7dce3;border-radius:8px;background:#fff;color:var(--navy);font-size:13px;font-weight:650}
.board-tool:hover{border-color:var(--teal)}
.board-tool.active{color:#fff;border-color:var(--teal);background:var(--teal)}
.toolbar-label{font-size:12px;font-weight:650;color:var(--muted);display:flex;gap:7px;align-items:center}
.toolbar-label input[type=color]{width:35px;height:32px;padding:1px;border:1px solid var(--border);border-radius:7px;background:#fff}
.toolbar-label select{padding:6px;border:1px solid var(--border);border-radius:7px;background:#fff}
.board-text-field{padding:9px 12px;display:flex;gap:8px;flex-wrap:wrap;align-items:center;font-size:12px;color:var(--muted);border-bottom:1px solid var(--border)}
.board-text-field input{min-width:150px;flex:1;padding:7px 10px;border:1px solid var(--border);border-radius:8px}
.board-stage{position:relative;width:100%;aspect-ratio:1000/620;overflow:hidden;background:#fff;user-select:none;-webkit-user-select:none}
.board-stage canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
#boardCanvas{touch-action:none;cursor:crosshair}
.board-hint{padding:9px 12px;font-size:12px;color:var(--muted);border-top:1px solid var(--border)}
.gallery-panel{margin-top:18px}
.board-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(185px,1fr));gap:13px;margin-top:16px}
.board-card{border:1px solid var(--border);border-radius:12px;background:#fff;overflow:hidden;min-width:0}
.board-image-button{display:block;width:100%;padding:0;background:#fff;border:0}
.board-image-button img{width:100%;aspect-ratio:1000/620;object-fit:contain;display:block;background:#fff}
.board-card-foot{padding:10px;display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap}
.board-card-foot span{font-size:12px;font-weight:700;overflow-wrap:anywhere}
.board-card-foot .button{padding:7px 9px;font-size:11px}
.board-modal{padding:20px;width:min(95vw,1100px);max-height:94vh;border:1px solid var(--border);border-radius:15px;box-shadow:0 16px 70px rgba(5,25,40,.2)}
.board-modal::backdrop{background:rgba(8,25,35,.7)}
.board-modal img{width:100%;max-height:calc(94vh - 95px);object-fit:contain;display:block;background:#fff;border-radius:7px}
.spotlight{margin:22px 0;border:1px solid #a2d1cd;border-radius:13px;padding:15px;background:#f4fbfa}
.spotlight img{display:block;width:100%;max-height:620px;object-fit:contain;background:#fff;border:1px solid var(--border);border-radius:9px}
.teacher-question-image{width:100%;max-height:270px;object-fit:contain;display:block;margin-top:12px;border-radius:8px;background:#fff}
@media(max-width:760px){.board-toolbar{padding:8px}.board-tool{padding:7px 8px;font-size:12px}.board-grid{grid-template-columns:repeat(auto-fill,minmax(145px,1fr))}}

[hidden]{display:none!important}