:root{--bg:#f5f7fb;--surface:#fff;--ink:#172033;--muted:#667085;--line:#e5e9f2;--primary:#4f46e5;--primary2:#7c3aed;--success:#16a34a;--warning:#d97706;--danger:#dc2626;--shadow:0 12px 35px rgba(32,44,82,.08);font-family:Prompt,system-ui,sans-serif;color:var(--ink);background:var(--bg)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-height:100vh;background:radial-gradient(circle at 10% 0,#eef2ff 0,transparent 28%),var(--bg)}a{color:var(--primary);text-decoration:none}button,input,select,textarea{font:inherit}button{cursor:pointer}.topbar{position:sticky;top:0;z-index:20;display:flex;justify-content:space-between;align-items:center;padding:14px max(24px,calc((100vw - 1180px)/2));background:rgba(255,255,255,.92);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.brand{display:flex;gap:10px;align-items:center;font-weight:700;color:var(--ink)}.brand-mark{display:grid;place-items:center;width:36px;height:36px;border-radius:12px;color:#fff;background:linear-gradient(135deg,var(--primary),var(--primary2));box-shadow:0 8px 20px #4f46e540}.nav{display:flex;gap:18px;align-items:center}.nav form{margin:0}.user-chip{padding:7px 12px;border-radius:999px;background:#f1f5f9;font-size:.88rem}.link-button{border:0;background:transparent;color:var(--muted)}.shell{width:min(1180px,calc(100% - 32px));margin:32px auto 80px}.footer{text-align:center;color:var(--muted);padding:30px}.flash{padding:14px 18px;border-radius:12px;margin-bottom:22px;border:1px solid}.flash-success{background:#ecfdf3;color:#166534;border-color:#bbf7d0}.flash-error{background:#fef2f2;color:#991b1b;border-color:#fecaca}.flash-warning{background:#fffbeb;color:#92400e;border-color:#fde68a}.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:.76rem;font-weight:700;color:var(--primary)}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(2rem,4vw,3.2rem);line-height:1.12;margin-bottom:12px}h2{font-size:1.35rem}p{color:var(--muted);line-height:1.65}.hero{min-height:560px;display:grid;grid-template-columns:1.15fr .85fr;gap:70px;align-items:center}.hero h1 span{color:var(--primary)}.hero p{font-size:1.08rem;max-width:650px}.hero-actions,.button-row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.button{display:inline-flex;align-items:center;justify-content:center;border:0;border-radius:12px;padding:11px 17px;font-weight:600;transition:.2s}.button:hover{transform:translateY(-1px)}.button.primary{background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;box-shadow:0 8px 20px #4f46e530}.button.secondary{background:#eef2ff;color:#3730a3}.button.ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}.button.danger{background:#fee2e2;color:#991b1b}.button.wide{width:100%}.hero-card{background:#fff;border:1px solid #e0e7ff;border-radius:28px;padding:45px;box-shadow:var(--shadow);transform:rotate(1deg)}.map-node{padding:16px 20px;border-radius:14px;font-weight:600}.map-node.done{background:#ecfdf3;color:#166534}.map-node.current{background:#eef2ff;color:#3730a3;border:2px solid #818cf8;box-shadow:0 0 0 6px #eef2ff}.map-node.locked{background:#f8fafc;color:#64748b}.map-line{height:45px;width:3px;margin:auto;background:#86efac}.map-line.faint{background:#dbe4f0}.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.feature{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px}.feature b{font-size:1.05rem}.feature p{font-size:.9rem;margin:8px 0 0}.auth-wrap{min-height:70vh;display:grid;place-items:center}.auth-card{width:min(520px,100%);background:#fff;padding:38px;border-radius:24px;box-shadow:var(--shadow);border:1px solid var(--line)}.form-stack{display:flex;flex-direction:column;gap:16px}.form-stack.compact{gap:12px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.form-grid-wide{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:18px;align-items:end}.span-3{grid-column:1/-1}label{display:flex;flex-direction:column;gap:7px;font-size:.88rem;font-weight:500;color:#344054}label small{font-weight:400;color:var(--muted)}input,select,textarea{width:100%;border:1px solid #d7dce5;background:#fff;border-radius:10px;padding:10px 12px;color:var(--ink);outline:none}input:focus,select:focus,textarea:focus{border-color:#818cf8;box-shadow:0 0 0 3px #eef2ff}textarea{resize:vertical}.check{flex-direction:row;align-items:center}.check input{width:auto}.center{text-align:center}.muted{color:var(--muted);font-size:.9rem}.page-head{display:flex;justify-content:space-between;gap:30px;align-items:flex-end;margin-bottom:26px}.page-head h1{font-size:2.35rem}.page-head p{margin-bottom:0}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:26px}.stat{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;display:flex;justify-content:space-between;align-items:center}.stat span{color:var(--muted)}.stat strong{font-size:2rem;color:var(--primary)}.two-col{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:24px}.side-stack{display:flex;flex-direction:column;gap:16px}.panel{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:0 4px 15px rgba(32,44,82,.03)}.panel summary{font-weight:650;cursor:pointer;list-style:none}.panel summary::-webkit-details-marker{display:none}.section-panel{margin:22px 0;scroll-margin-top:90px}.narrow{max-width:760px;margin:22px auto}.section-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}.section-title h2{margin:3px 0 0}.count,.badge,.rank-chip,.status{display:inline-flex;align-items:center;padding:5px 10px;border-radius:999px;font-size:.76rem;font-weight:650;background:#f1f5f9;color:#475569}.course-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.student-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.course-card{position:relative;overflow:hidden;display:block;background:#fff;color:var(--ink);border:1px solid var(--line);border-radius:18px;padding:24px;min-height:205px;box-shadow:0 4px 15px rgba(32,44,82,.03);transition:.2s}.course-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}.course-accent{position:absolute;left:0;top:0;width:7px;height:100%;background:var(--course)}.course-card small{display:block;color:var(--muted);margin-top:18px}.course-card h3{font-size:1.2rem;margin:5px 0 8px}.course-card p{font-size:.86rem}.card-metrics{display:flex;justify-content:space-between;color:#475569;font-size:.82rem;margin-top:14px}.back{display:inline-flex;margin-bottom:16px;color:#475569}.course-hero{background:linear-gradient(125deg,var(--course),#111827);color:#fff;border-radius:24px;padding:34px;display:flex;justify-content:space-between;align-items:center;gap:30px;box-shadow:var(--shadow)}.course-hero h1{font-size:2.3rem}.course-hero p{color:#ffffffcc;margin:0}.join-box,.rank-box{min-width:180px;text-align:center;background:#ffffff18;border:1px solid #ffffff35;border-radius:18px;padding:18px;display:flex;flex-direction:column;gap:5px}.join-box strong{font-size:1.8rem;letter-spacing:.12em}.tiny-button{border:0;background:#eef2ff;color:#3730a3;border-radius:8px;padding:6px 9px;font-size:.78rem}.anchor-nav{display:flex;gap:8px;overflow:auto;margin:18px 0;padding-bottom:2px}.anchor-nav a{white-space:nowrap;background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 13px;color:#475569}.stage-list{display:flex;flex-direction:column;gap:10px;margin-bottom:14px}.stage-row{display:flex;gap:15px;align-items:center;border:1px solid var(--line);border-radius:14px;padding:14px}.stage-index,.stage-orb{flex:0 0 auto;display:grid;place-items:center;width:42px;height:42px;border-radius:50%;background:#eef2ff;color:#3730a3;font-weight:700}.grow{flex:1;min-width:0}.stage-row h3,.stage-row p{margin:0}.stage-row p,.stage-row small{font-size:.82rem;color:var(--muted)}.icon-danger{border:0;background:transparent;color:var(--danger);padding:6px}.table-wrap{overflow:auto}.table-wrap table{width:100%;border-collapse:collapse;min-width:720px}.table-wrap th,.table-wrap td{text-align:left;padding:12px 10px;border-bottom:1px solid var(--line);vertical-align:middle;font-size:.87rem}.table-wrap th{color:var(--muted);font-size:.76rem;text-transform:uppercase}.card-list{display:flex;flex-direction:column;gap:10px}.list-card{display:flex;justify-content:space-between;align-items:center;padding:15px;border:1px solid var(--line);border-radius:12px;color:var(--ink)}.list-card p{margin:4px 0 0;font-size:.82rem}.status-published{background:#dcfce7;color:#166534}.status-draft{background:#fff7ed;color:#9a3412}.status-closed{background:#f1f5f9;color:#475569}.warning-text{color:var(--warning)}.submission-list{display:flex;flex-direction:column;gap:12px}.submission{display:flex;gap:20px;align-items:center;border:1px solid var(--line);border-radius:14px;padding:16px}.submission p{margin:2px 0;font-size:.83rem}.note{background:#f8fafc;padding:8px;border-radius:8px}.grade-form{display:grid;grid-template-columns:90px 180px auto;gap:8px;align-items:end}.notice{background:#f8fafc;border:1px solid #dbe4f0;border-radius:12px;padding:14px;margin:15px 0}.notice p{margin:5px 0 0;font-size:.86rem}.request-row{display:flex;justify-content:space-between;align-items:center;padding:9px 0;border-top:1px solid var(--line)}.inline{display:inline-flex;gap:5px;align-items:center}.score-input{width:80px}.block{display:block}.import-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.import-card{display:flex;flex-direction:column;gap:12px;border:1px dashed #a5b4fc;border-radius:15px;padding:18px;background:#fafaff}.question-list{display:flex;flex-direction:column;gap:12px}.question-card{border:1px solid var(--line);border-radius:14px;padding:14px}.question-card summary{display:flex;justify-content:space-between;align-items:center;gap:20px}.question-card[open] summary{padding-bottom:14px;border-bottom:1px solid var(--line);margin-bottom:14px}.empty-mini{padding:28px;text-align:center;color:var(--muted);border:1px dashed #cbd5e1;border-radius:14px}.empty-state{min-height:65vh;display:grid;place-content:center;text-align:center}.empty-icon{font-size:4rem}.progress{height:9px;background:#e7ebf2;border-radius:999px;overflow:hidden}.progress span{display:block;height:100%;background:linear-gradient(90deg,var(--primary),#a855f7);border-radius:inherit}.join-panel{text-align:center}.join-form{display:flex;gap:10px;justify-content:center}.join-form input{max-width:280px}.rank-box span{font-size:2.2rem}.rank-box strong{font-size:1.15rem}.score-strip{display:grid;grid-template-columns:repeat(4,1fr);background:#fff;border:1px solid var(--line);border-radius:16px;margin:18px 0;padding:15px}.score-strip div{display:flex;flex-direction:column;align-items:center;border-right:1px solid var(--line)}.score-strip div:last-child{border:0}.score-strip span{color:var(--muted);font-size:.8rem}.score-strip b{font-size:1.2rem}.journey{max-width:880px;margin:30px auto}.finish-banner{text-align:center;background:linear-gradient(135deg,#fef3c7,#fde68a);color:#92400e;padding:16px;border-radius:16px;font-weight:700;margin-bottom:30px}.stage-card{display:flex;gap:18px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;margin-bottom:28px;position:relative}.stage-card:not(:last-child):after{content:"";position:absolute;width:3px;height:29px;left:41px;bottom:-29px;background:#c7d2fe}.stage-card.complete{border-color:#86efac}.stage-card.complete .stage-orb{background:#dcfce7;color:#166534}.stage-card.current{border-color:#818cf8;box-shadow:0 0 0 4px #eef2ff}.stage-card.upcoming{opacity:.72}.mission-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:14px}.mission{display:flex;gap:10px;align-items:center;padding:12px;border:1px solid var(--line);border-radius:12px;color:var(--ink);background:#fff}.mission.done{background:#f0fdf4;border-color:#bbf7d0}.mission span{font-size:1.2rem}.mission small{display:block;color:var(--muted)}.bonus-panel{display:flex;gap:20px;align-items:center;justify-content:space-between;flex-wrap:wrap}.bonus-panel p{margin:0}.redemption-list{width:100%;display:flex;gap:8px;flex-wrap:wrap}.redemption-list span{font-size:.78rem;background:#f8fafc;padding:6px 9px;border-radius:8px}.deadline{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);padding:14px;border-radius:14px}.deadline span,.deadline small{font-size:.8rem;color:var(--muted)}.assignment-layout{grid-template-columns:minmax(0,1fr) 330px}.result-card{text-align:center;display:flex;flex-direction:column;gap:8px}.big-icon{font-size:3rem}.big-score{font-size:2rem;color:var(--primary)}.quiz-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.timer{position:sticky;top:85px;background:#111827;color:#fff;border-radius:14px;padding:14px 20px;font-size:1.5rem;font-weight:700}.quiz-form{max-width:820px;margin:auto}.quiz-question{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px;margin-bottom:16px}.question-number{color:var(--primary);font-size:.8rem;font-weight:700}.quiz-question h2{margin-top:8px}.choices{display:flex;flex-direction:column;gap:9px}.choices label{display:block}.choices input{position:absolute;opacity:0}.choices span{display:block;border:1px solid var(--line);border-radius:12px;padding:12px}.choices input:checked+span{border-color:#6366f1;background:#eef2ff}.choices b{display:inline-grid;place-items:center;width:26px;height:26px;background:#f1f5f9;border-radius:7px;margin-right:8px}hr{border:0;border-top:1px solid var(--line);margin:24px 0}
.edit-stack{display:flex;flex-direction:column;gap:12px;margin-top:14px}.edit-box{background:#f8fafc;border:1px solid var(--line);border-radius:12px;padding:14px}.mini-link{font-size:.72rem;color:var(--primary);margin-top:5px}.mini-form{display:grid;grid-template-columns:repeat(2,minmax(120px,1fr));gap:6px;margin-top:8px;min-width:360px}.mini-form input{padding:6px;font-size:.75rem}
.peer-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.peer{display:flex;align-items:center;gap:10px;border:1px solid var(--line);border-radius:12px;padding:12px}.peer-place{display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:#eef2ff;color:#3730a3;font-weight:700}.peer div{flex:1}.peer small{display:block;color:var(--muted)}.peer strong{font-size:.85rem;color:var(--primary)}
@media(max-width:900px){.hero{grid-template-columns:1fr;gap:30px;min-height:auto;padding:50px 0}.feature-grid,.student-grid{grid-template-columns:repeat(2,1fr)}.two-col,.assignment-layout{grid-template-columns:1fr}.side-stack{order:-1}.score-strip{grid-template-columns:repeat(2,1fr);gap:12px}.score-strip div{border:0}.grade-form{grid-template-columns:1fr}.import-grid,.peer-grid{grid-template-columns:1fr}}
@media(max-width:620px){.shell{width:min(100% - 20px,1180px);margin-top:18px}.topbar{padding:10px}.brand span:last-child{display:none}.user-chip{display:none}.feature-grid,.course-grid,.student-grid,.stats-grid,.form-grid,.form-grid-wide,.mission-grid{grid-template-columns:1fr}.span-3{grid-column:auto}.page-head,.course-hero,.submission,.quiz-head{align-items:stretch;flex-direction:column}.course-hero{padding:24px}.join-box,.rank-box{width:100%}.anchor-nav{margin-left:-10px;margin-right:-10px}.score-strip{grid-template-columns:1fr 1fr}.stage-card{padding:16px}.stage-card:not(:last-child):after{left:35px}.request-row{align-items:flex-start;gap:12px;flex-direction:column}.join-form{flex-direction:column}.join-form input{max-width:none}.auth-card{padding:25px}.nav{gap:8px}}