:root{font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#0f172a;background:#f8fafc;line-height:1.5;font-weight:400}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100%}body{background:#f8fafc}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}img{max-width:100%;display:block}.container{width:min(1200px,calc(100% - 32px));margin:0 auto}.student-shell{min-height:100vh;background:radial-gradient(circle at top right,rgba(59,130,246,.15),transparent 25%),radial-gradient(circle at top left,rgba(14,165,233,.14),transparent 25%),#f8fafc}.topbar{position:sticky;top:0;z-index:20;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#f8fafce0;border-bottom:1px solid rgba(226,232,240,.8)}.topbar-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:16px 0}.brand-inline{display:flex;align-items:center;gap:14px}.brand-badge{width:48px;height:48px;border-radius:16px;display:grid;place-items:center;font-weight:800;color:#fff;background:linear-gradient(135deg,#2563eb,#06b6d4);box-shadow:0 12px 24px #2563eb3d}.brand-title{font-size:18px;font-weight:800}.brand-subtitle{color:#64748b;font-size:13px}.topnav{display:flex;gap:10px;flex-wrap:wrap}.topnav-link{padding:10px 14px;border-radius:999px;color:#475569;font-weight:600}.topnav-link.active,.topnav-link:hover{background:#dbeafe;color:#1d4ed8}.user-menu{display:flex;align-items:center;gap:12px}.user-meta{display:grid;gap:2px}.user-meta span{color:#64748b;font-size:13px}.avatar{width:42px;height:42px;border-radius:999px;display:grid;place-items:center;background:#1d4ed8;color:#fff;font-weight:800}.main-content{padding:28px 0 40px}.page-stack{display:grid;gap:22px}.page-header,.page-header.compact{display:flex;justify-content:space-between;align-items:flex-start;gap:16px}.page-header h2{margin:0;font-size:30px}.page-header p{margin:6px 0 0;color:#64748b}.hero-card{display:grid;grid-template-columns:1.3fr .9fr;gap:20px;padding:26px;background:linear-gradient(135deg,#0f172a,#1e3a8a 55%,#0ea5e9);color:#fff;border-radius:28px;box-shadow:0 18px 40px #0f172a2e}.hero-card h1{margin:10px 0 0;font-size:40px;line-height:1.1}.hero-card p{margin:12px 0 0;color:#ffffffd6;max-width:760px}.hero-metrics{display:grid;grid-template-columns:1fr;gap:14px;align-content:stretch}.eyebrow{text-transform:uppercase;letter-spacing:.08em;font-size:12px;font-weight:800;color:#38bdf8}.hero-card .eyebrow{color:#bfdbfe}.card,.auth-card,.stat-card{background:#fff;border-radius:22px;box-shadow:0 12px 30px #0f172a0f;border:1px solid #e2e8f0}.card,.auth-card{padding:20px}.stat-card{padding:18px}.stack-12{display:grid;gap:12px}.stack-16{display:grid;gap:16px}.two-col-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.align-start{align-items:start}.level-grid,.unit-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.level-card,.lesson-card,.section-link{border-radius:22px;border:1px solid #dbeafe;background:linear-gradient(180deg,#fff,#f8fbff);box-shadow:0 12px 28px #2563eb0f}.level-card{padding:20px;display:grid;gap:10px}.level-card:hover,.section-link:hover,.lesson-card:hover{transform:translateY(-2px)}.level-card-top,.unit-head{display:flex;align-items:center;justify-content:space-between;gap:10px}.level-order,.soft-badge{display:inline-flex;align-items:center;padding:6px 10px;border-radius:999px;background:#eff6ff;color:#1d4ed8;font-size:12px;font-weight:700}.level-card h3,.lesson-card h3,.card h3{margin:0}.level-card p,.lesson-card p{margin:0;color:#64748b}.section-link{padding:14px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px}.lesson-list{display:grid;gap:14px}.lesson-card{padding:18px 20px;display:flex;align-items:center;justify-content:space-between;gap:14px}.lesson-hero{display:grid;grid-template-columns:1.3fr .7fr;gap:20px}.lesson-meta-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 16px;color:#334155}.lesson-thumb{width:100%;height:260px;object-fit:cover;border-radius:18px;border:1px solid #dbeafe}.thumb-placeholder{min-height:260px;border-radius:18px;display:grid;place-items:center;background:#f8fafc;border:1px dashed #cbd5e1;color:#64748b}.full-audio{width:100%}.question-block{padding:14px;border-radius:16px;border:1px solid #dbeafe;background:#f8fbff}.question-title{font-weight:700;color:#0f172a}.option-row{display:flex;gap:10px;align-items:center}.option-row input{width:auto}.preview-item{padding:14px;border:1px solid #e2e8f0;border-radius:16px;background:#f8fafc}.preview-item-title{font-size:12px;font-weight:800;color:#1d4ed8;text-transform:uppercase;margin-bottom:6px}.profile-grid{display:grid;gap:12px}.profile-grid div{display:grid;gap:4px}.profile-grid span{color:#64748b;font-size:13px}.stat-label{color:#64748b;font-size:14px}.stat-value{margin-top:8px;font-size:34px;font-weight:800;color:#0f172a}.stat-value.sm{font-size:24px}.stats-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.stats-grid.three-up{grid-template-columns:repeat(3,minmax(0,1fr))}.status-pill{display:inline-flex;align-items:center;padding:6px 10px;border-radius:999px;font-size:12px;font-weight:700;text-transform:capitalize}.status-pill.active,.status-pill.completed{background:#dcfce7;color:#15803d}.status-pill.inactive{background:#e2e8f0;color:#475569}.status-pill.new,.status-pill.started{background:#fef3c7;color:#b45309}.field{display:grid;gap:8px}.field span{color:#334155;font-weight:600;font-size:14px}input,select,textarea{width:100%;padding:11px 14px;border-radius:12px;border:1px solid #cbd5e1;outline:none;background:#fff}input:focus,select:focus,textarea:focus{border-color:#3b82f6;box-shadow:0 0 0 4px #3b82f61f}.json-editor{min-height:260px;font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;font-size:13px}.json-box{overflow:auto;background:#020617;color:#e2e8f0;border-radius:16px;padding:14px;font-size:12px;line-height:1.55}.details-summary{cursor:pointer;font-weight:700}.button{border:0;border-radius:12px;padding:10px 14px;font-weight:700;cursor:pointer}.button.primary{background:#2563eb;color:#fff}.button.ghost{background:#fff;color:#0f172a;border:1px solid #e2e8f0}.button.full{width:100%}.button:disabled{opacity:.65;cursor:not-allowed}.inline-actions{display:flex;gap:10px;align-items:center}.inline-actions.wrap{flex-wrap:wrap}.chip-group{display:flex;flex-wrap:wrap;gap:8px}.chip{padding:8px 12px;border-radius:999px;background:#f1f5f9;border:1px solid #cbd5e1}.chip.active{background:#dbeafe;border-color:#93c5fd;color:#1d4ed8}.alert{padding:12px 14px;border-radius:14px;font-weight:600}.alert.error{background:#fef2f2;color:#b91c1c;border:1px solid #fecaca}.alert.success{background:#ecfdf5;color:#047857;border:1px solid #a7f3d0}.hint-box{padding:14px;border-radius:14px;background:#f8fafc;border:1px dashed #cbd5e1}.success-box{background:#f0fdf4;border-style:solid}.muted-text{color:#64748b}.table-wrap{width:100%;overflow-x:auto}table{width:100%;border-collapse:collapse}th,td{padding:12px 10px;border-bottom:1px solid #e2e8f0;text-align:left;vertical-align:middle}th{font-size:13px;color:#64748b;text-transform:uppercase;letter-spacing:.04em}.auth-page{min-height:100vh;display:grid;place-items:center;padding:20px}.student-bg{background:radial-gradient(circle at top,#dbeafe,#f8fafc 58%)}.auth-card{width:min(100%,520px)}.auth-wide{padding:28px}.auth-title{margin:0;font-size:28px}@media(max-width:1024px){.hero-card,.lesson-hero,.two-col-grid,.level-grid,.unit-grid,.stats-grid,.lesson-meta-grid{grid-template-columns:1fr}}@media(max-width:860px){.topbar-inner{flex-direction:column;align-items:stretch}.user-menu{justify-content:space-between;flex-wrap:wrap}.page-header{flex-direction:column}.lesson-card{flex-direction:column;align-items:flex-start}}.alert.info{background:#eff6ff;color:#1d4ed8;border:1px solid #bfdbfe}.info-box{background:#eff6ff;border-style:solid;border-color:#bfdbfe}.mt-8{margin-top:8px}.fancy-option{padding:10px 12px;border:1px solid #dbeafe;border-radius:14px;background:#fff}.renderer-card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.renderer-visual-card{border:1px solid #dbeafe;background:linear-gradient(180deg,#fff,#f8fbff);border-radius:18px;overflow:hidden}.renderer-visual-card h4{margin:0;font-size:18px}.renderer-visual-card p{margin:0;color:#64748b}.renderer-card-image{width:100%;height:150px;object-fit:cover;border-bottom:1px solid #dbeafe}.image-question-block{display:grid;gap:12px}.question-image{width:100%;max-width:360px;border-radius:18px;border:1px solid #dbeafe;background:#fff}.reading-passage{padding:18px;border-radius:18px;background:linear-gradient(180deg,#eff6ff,#fff);border:1px solid #bfdbfe}.reading-passage p{margin:10px 0 0;color:#334155}.drag-token-grid{display:grid;gap:10px}.drag-token-row{display:flex;justify-content:space-between;gap:10px;align-items:center;padding:10px 12px;border-radius:14px;background:#fff;border:1px solid #dbeafe}.drag-token{display:inline-flex;padding:8px 10px;border-radius:999px;background:#dbeafe;color:#1d4ed8;font-weight:700}.sentence-preview{padding:12px 14px;border-radius:14px;border:1px dashed #93c5fd;background:#eff6ff;color:#1e3a8a;font-weight:600}.mini-button-row{display:flex;gap:8px}.button.mini{padding:8px 10px;min-width:42px}.short-answer-box{min-height:120px}.preview-stats-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.preview-stat{padding:14px;border-radius:16px;border:1px solid #dbeafe;background:#f8fbff;display:grid;gap:4px}.preview-stat strong{font-size:24px;color:#1d4ed8}.preview-stat span{color:#64748b;font-size:13px}.raw-answer-box{border-top:1px solid #e2e8f0;padding-top:12px}@media(max-width:1024px){.renderer-card-grid,.preview-stats-grid{grid-template-columns:1fr}}.padded-card-content{padding:14px}.warning-box{background:#fff7ed;border-style:solid;border-color:#fdba74}.preview-stats-grid.five-up{grid-template-columns:repeat(5,minmax(0,1fr))}.matching-grid{display:grid;gap:12px}.matching-row{display:grid;grid-template-columns:1fr minmax(220px,320px);gap:14px;align-items:center}.matching-left{font-weight:700;font-size:16px}.matching-preview-row{display:grid;gap:4px}.compat-editor{min-height:420px}.file-like-button{display:inline-flex;align-items:center}.lab-hero{display:grid;gap:10px}@media(max-width:1024px){.preview-stats-grid.five-up{grid-template-columns:1fr 1fr}}@media(max-width:860px){.matching-row{grid-template-columns:1fr}}
