:root{--bg:#f6f8fc;--panel:#fff;--text:#182033;--muted:#667085;--line:#e4e8f0;--accent:#4f46e5;--accent2:#4338ca;--accentSoft:#eef2ff;--green:#137333;--greenSoft:#effaf4;--orange:#b54708;--orangeSoft:#fff7ed;--danger:#b42318;--dangerSoft:#fef3f2;--shadow:0 18px 50px rgba(27,39,94,.08)}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--bg);color:var(--text);font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
.site-header{display:flex;justify-content:space-between;align-items:center;padding:20px clamp(18px,4vw,54px);border-bottom:1px solid var(--line);background:#fff}.brand{font-size:22px;font-weight:900;letter-spacing:-.02em}.brand span{color:var(--accent)}.tag{color:var(--muted);font-size:14px}.page{width:min(1120px,calc(100% - 32px));margin:0 auto;padding:48px 0 70px}
.hero{text-align:center;max-width:850px;margin:0 auto 34px}.eyebrow{display:inline-block;padding:7px 11px;border-radius:999px;background:var(--accentSoft);color:var(--accent);font-weight:850;font-size:12px;letter-spacing:.08em;text-transform:uppercase}.hero h1{font-size:clamp(36px,6vw,66px);line-height:1.04;letter-spacing:-.045em;margin:18px 0 14px}.hero p{font-size:clamp(17px,2.1vw,22px);line-height:1.55;color:var(--muted);margin:0 auto;max-width:760px}
.mode-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:38px}.mode-card,.card{background:var(--panel);border:1px solid var(--line);border-radius:22px;padding:26px;box-shadow:var(--shadow)}.mode-card{display:flex;flex-direction:column;min-height:430px}.mode-card.live{border-color:#fed7aa}.mode-card.individual{border-color:#b7e4c7}.mode-icon{width:58px;height:58px;border-radius:16px;display:grid;place-items:center;font-size:28px;margin-bottom:16px}.live .mode-icon{background:var(--orangeSoft)}.individual .mode-icon{background:var(--greenSoft)}.badge{display:inline-block;width:max-content;font-size:12px;font-weight:850;border-radius:999px;padding:6px 9px;margin-bottom:10px}.live .badge{background:var(--orangeSoft);color:var(--orange)}.individual .badge{background:var(--greenSoft);color:var(--green)}.mode-card h2{font-size:30px;margin:0 0 8px}.subtitle{color:var(--muted);line-height:1.55;margin:0 0 18px}.feature-list{display:grid;gap:10px;margin:0 0 22px;padding:0;list-style:none}.feature-list li{display:flex;gap:10px;color:#344054;line-height:1.45}.feature-list li:before{content:'✓';font-weight:900;color:var(--accent)}
.actions{display:flex;gap:10px;flex-wrap:wrap}.card-actions{display:grid;gap:10px;margin-top:auto}.button,button{display:inline-flex;align-items:center;justify-content:center;appearance:none;border:0;border-radius:12px;padding:12px 15px;font:inherit;font-weight:850;cursor:pointer;text-decoration:none}.button:hover{text-decoration:none}.primary{background:var(--accent);color:#fff}.primary:hover{background:var(--accent2)}.secondary{background:#f8fafc;color:var(--text);border:1px solid var(--line)}.ghost{background:transparent;color:var(--accent);border:1px solid var(--line)}.helper{font-size:12px;color:var(--muted);text-align:center;margin-top:7px}.philosophy{margin:30px auto 0;padding:17px;border-radius:18px;background:#fff;border:1px solid var(--line);display:flex;justify-content:center;gap:24px;flex-wrap:wrap;color:#475467;font-weight:750}
.section-title{display:flex;justify-content:space-between;align-items:center;gap:14px}.field{display:grid;gap:6px;margin:14px 0}.field label,label.label{font-weight:750}.field input,.field select,input[type=text],input[type=password],input[type=number]{width:100%;padding:12px 13px;border:1px solid #d0d5dd;border-radius:11px;background:#fff;color:var(--text);font-size:16px}.small{font-size:13px;color:var(--muted);line-height:1.5}.note{padding:13px 15px;border-radius:12px;background:var(--accentSoft);border:1px solid #c7d2fe;color:#3730a3;line-height:1.5}.warn{padding:13px 15px;border-radius:12px;background:var(--orangeSoft);border:1px solid #fed7aa;color:#9a3412}.good{padding:13px 15px;border-radius:12px;background:var(--greenSoft);border:1px solid #b7e4c7;color:#137333}.bad{padding:13px 15px;border-radius:12px;background:var(--dangerSoft);border:1px solid #fecdca;color:var(--danger)}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:22px}.steps{counter-reset:step;display:grid;gap:14px}.step{position:relative;padding:18px 18px 18px 58px;background:#fff;border:1px solid var(--line);border-radius:16px}.step:before{counter-increment:step;content:counter(step);position:absolute;left:16px;top:16px;width:30px;height:30px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;font-weight:900}.codebox{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;white-space:pre-wrap;background:#f8fafc;color:#172033;border:1px solid #d9dfeb;border-radius:14px;padding:16px;line-height:1.6;font-size:14px;overflow:auto}.toplinks{display:flex;gap:14px;flex-wrap:wrap;font-size:14px}.file-row{display:flex;gap:12px;align-items:center;flex-wrap:wrap;padding:16px;border:1px dashed #b8c1d1;border-radius:14px;background:#fbfcfe}.status{margin-top:14px}.copybox{display:grid;grid-template-columns:1fr auto;gap:8px}.copybox input{min-width:0}.question{font-size:22px;font-weight:800;line-height:1.4;margin:14px 0}.choices{display:grid;gap:10px}.choice{display:flex;gap:10px;align-items:flex-start;border:1px solid var(--line);border-radius:12px;padding:12px;background:#fff}.choice input{margin-top:4px}.feedback{margin-top:14px;padding:12px;border-radius:11px;font-weight:800}.feedback.correct{background:var(--greenSoft);color:#137333;border:1px solid #b7e4c7}.feedback.incorrect{background:var(--dangerSoft);color:var(--danger);border:1px solid #fecdca}.hint{margin-top:12px;padding:12px;border-left:4px solid var(--accent);background:var(--accentSoft);border-radius:8px}.qgraphic{display:block;max-width:100%;max-height:430px;margin:12px auto 18px;border:1px solid var(--line);border-radius:12px}.modal-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.72);display:grid;place-items:center;padding:18px;z-index:999}.modal{width:min(720px,100%);max-height:88vh;overflow:auto;background:#fff;border-radius:18px;padding:24px}.timer{font-weight:900;color:var(--accent);margin:8px 0 14px}.redo-list{display:grid;gap:9px}.redo-item{padding:11px;border:1px solid var(--line);border-radius:10px;background:#fbfcfe}.score{font-size:34px;font-weight:900}.footer{text-align:center;color:var(--muted);font-size:13px;margin-top:28px}
@media(max-width:780px){.site-header{align-items:flex-start;flex-direction:column;gap:7px}.mode-grid,.two-col{grid-template-columns:1fr}.page{padding-top:32px}.mode-card{min-height:0}.copybox{grid-template-columns:1fr}}