*{box-sizing:border-box}
body{padding-bottom:72px}
header{background:radial-gradient(circle at 50% -35%,rgba(167,139,250,.17),transparent 53%),linear-gradient(180deg,var(--bg2),transparent)}
header h1{font-size:clamp(29px,5vw,44px);letter-spacing:-.035em}
.topnav{justify-content:space-between}
.theme-btn{border:1px solid var(--line);border-radius:9px;background:var(--panel);color:var(--muted);font:600 12px "JetBrains Mono",monospace;padding:8px 12px;cursor:pointer}
.theme-btn:hover{border-color:var(--cyan);color:var(--cyan)}
.section{margin-top:44px}
.sec-sub{max-width:810px}
.iv-note{margin:0 0 14px;color:var(--muted);font-size:14px;line-height:1.65}
.page-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:16px}
.card-link{min-height:176px;border-left-color:var(--violet)}
.card-link .cl-num{color:var(--violet)}
.format-grid,.rubric-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:14px 0}
.field-label{display:block;margin:0 0 5px;color:var(--muted);font-size:12px;font-weight:700}
.ov-input{width:100%;border:1px solid var(--line);border-radius:9px;background:var(--bg2);color:var(--ink);font:14px "JetBrains Mono",monospace;padding:10px 12px}
.ov-input:focus{outline:none;border-color:var(--cyan)}
.format-check{display:flex;gap:10px;align-items:center;padding:10px 12px;border:1px solid var(--line);border-radius:9px;background:var(--bg2);font-size:14px;cursor:pointer}
.format-check input,.access-item input{accent-color:var(--cyan)}
.format-check input{width:16px;height:16px}
.formula-strip{margin:14px 0;padding:12px 14px;border-radius:9px;background:var(--bg2);border:1px solid var(--line);font:14px "JetBrains Mono",monospace;color:var(--cyan)}
.concept-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:16px 0}
.concept-card{padding:17px;border:1px solid var(--line);border-radius:12px;background:var(--panel2)}
.concept-card h3{margin:0 0 8px;color:var(--cyan);font-size:16px}.concept-card p{margin:0;color:var(--muted);font-size:14px;line-height:1.65}
.comparison{width:100%;border-collapse:collapse;font-size:14px;margin:14px 0}.comparison th,.comparison td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.comparison th{color:var(--cyan);background:var(--bg2);font:12px "JetBrains Mono",monospace;text-transform:uppercase}.comparison td:first-child{font-weight:700;white-space:nowrap}
.access-list{display:grid;gap:8px}.access-item{display:flex;gap:10px;align-items:flex-start;padding:11px 12px;border:1px solid var(--line);border-radius:9px;background:var(--bg2);cursor:pointer;font-size:14px;line-height:1.5}.access-item input{margin-top:3px}.access-item b{color:var(--ink)}
.note-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:16px 0}.note-card{padding:16px;border:1px solid var(--line);border-radius:12px;background:var(--panel)}.note-card h3{margin:0 0 7px;font-size:16px}.note-card p{margin:0;color:var(--muted);font-size:14px;line-height:1.6}
.slide-preview{min-height:170px;margin-top:15px;padding:24px 30px;border:1px solid rgba(167,139,250,.5);border-radius:10px;background:linear-gradient(135deg,#15102d,#0b2031);color:#f3f5ff;box-shadow:inset 0 0 0 1px rgba(255,255,255,.03)}
.slide-preview strong{display:block;font-size:clamp(18px,3vw,29px);line-height:1.2}.slide-preview ul{margin:18px 0 0;padding-left:20px;line-height:1.6}.slide-preview p{color:#d3d9ea}
.inspection-keys{display:flex;gap:8px;flex-wrap:wrap;margin:11px 0}.inspection-keys span{padding:4px 8px;border:1px solid var(--line);border-radius:999px;color:var(--muted);font:11px "JetBrains Mono",monospace}
.assessment-toolbar{display:flex;gap:13px;align-items:center;justify-content:space-between;flex-wrap:wrap;margin-bottom:15px}.assessment-kicker,.question-kicker{display:block;margin:0 0 3px;color:var(--muted);font:11px "JetBrains Mono",monospace;text-transform:uppercase;letter-spacing:.04em}.assessment-toolbar strong{font-size:16px}.btn-row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}.btn-c[aria-pressed="true"]{border-color:var(--cyan);background:rgba(34,211,238,.13);color:var(--cyan)}
.question-card{padding:17px;border:1px solid var(--line);border-radius:11px;background:var(--bg2)}.question-card h3{margin:0 0 9px;font-size:17px}.question-card p{margin:0 0 12px;font-size:14px;line-height:1.6}.question-options{display:grid;gap:7px}.question-option{display:flex;gap:9px;align-items:flex-start;padding:10px;border:1px solid var(--line);border-radius:8px;background:var(--panel);cursor:pointer;font-size:14px;line-height:1.45}.question-option:hover{border-color:var(--cyan)}.question-option input{margin-top:3px;accent-color:var(--cyan)}.question-option.right{border-color:var(--green);background:rgba(52,211,153,.1)}.question-option.wrong{border-color:var(--red);background:rgba(248,113,113,.1)}.question-feedback{margin-top:12px;padding:11px 12px;border-radius:8px;background:var(--panel);font-size:13px;line-height:1.6}.question-feedback b{color:var(--cyan)}
.timer{padding:8px 11px;border:1px solid rgba(252,211,77,.45);border-radius:8px;color:var(--amber);font:700 15px "JetBrains Mono",monospace}.exam-review{display:grid;gap:9px;margin:18px 0 0;padding-left:22px;font-size:14px;line-height:1.6}.exam-review li{padding:9px 11px;border:1px solid var(--line);border-radius:8px;background:var(--bg2)}
.rubric-table{width:100%;border-collapse:collapse;font-size:13px;margin:14px 0}.rubric-table th,.rubric-table td{padding:9px 10px;border:1px solid var(--line);text-align:left;vertical-align:top;line-height:1.5}.rubric-table th{background:var(--bg2);color:var(--cyan);font:11px "JetBrains Mono",monospace;text-transform:uppercase}.rubric-table td:first-child{font-weight:700}.rubric-select{min-width:112px}
@media(max-width:760px){.page-cards,.format-grid,.rubric-grid,.concept-grid,.note-grid{grid-template-columns:1fr}.comparison,.rubric-table{font-size:12px}.comparison th,.comparison td,.rubric-table th,.rubric-table td{padding:8px}.slide-preview{padding:20px}.topnav{padding:0 14px}.railwrap,.wrap{padding-left:14px;padding-right:14px}}