/* Programme MPSI + Math Olympiad */
.curriculum-section { padding: 20px 0 78px; }
.curriculum-heading { margin-bottom: 24px; }
.curriculum-note { color: var(--muted-2); font-size: 10px; letter-spacing: .08em; text-transform: uppercase; }
.curriculum-layout { display: grid; grid-template-columns: .72fr 1.28fr; gap: 18px; }
.chapter-rail, .chapter-detail { padding: 25px 27px; }
.rail-title { display: flex; justify-content: space-between; color: var(--muted-2); font-family: var(--mono); font-size: 10px; margin-bottom: 15px; }
.chapter-list { display: flex; flex-direction: column; gap: 4px; max-height: 480px; overflow-y: auto; padding-right: 4px; scrollbar-color: var(--line-strong) transparent; }
.chapter-button { width: 100%; flex: 0 0 auto; display: grid; grid-template-columns: 28px 1fr 16px; align-items: center; gap: 9px; text-align: left; color: var(--muted); background: transparent; border-radius: 9px; padding: 10px 9px; transition: background .2s, color .2s, transform .2s; }
.chapter-button:hover { color: var(--text); background: rgba(255,255,255,.045); transform: translateX(2px); }
.chapter-button.active { color: var(--text); background: rgba(255,116,76,.09); box-shadow: inset 2px 0 var(--accent); }
.chapter-number { color: var(--accent); font-family: var(--mono); font-size: 9px; }
.chapter-button b { display: block; font-size: 12px; font-weight: 600; }
.chapter-button small { display: block; color: var(--muted-2); font-size: 9px; margin-top: 2px; }
.chapter-button i { color: var(--muted-2); font-style: normal; font-size: 13px; opacity: 0; transition: opacity .2s; }
.chapter-button:hover i, .chapter-button.active i { opacity: 1; }
.rail-footer { display: flex; align-items: center; gap: 8px; margin-top: 20px; padding-top: 15px; border-top: 1px solid var(--line); color: var(--muted-2); font-size: 10px; }
.rail-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 10px var(--mint); }
.chapter-detail { min-height: 350px; position: relative; overflow: hidden; background: radial-gradient(circle at 89% 8%, rgba(138,171,255,.11), transparent 26%), var(--surface); }
.chapter-detail::after { content: "∑"; position: absolute; right: -12px; bottom: -52px; color: rgba(255,255,255,.025); font-family: Georgia, serif; font-size: 190px; pointer-events: none; }
.detail-topline, .problem-meta { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.chapter-tag, .problem-badge { color: var(--blue); border: 1px solid rgba(138,171,255,.3); background: rgba(138,171,255,.08); padding: 5px 8px; border-radius: 5px; font-size: 9px; font-weight: 650; letter-spacing: .13em; }
.detail-level, #problemNumber { color: var(--muted-2); font-size: 10px; }
.chapter-detail h3 { font-size: 25px; letter-spacing: -.05em; margin: 25px 0 8px; position: relative; z-index: 1; }
.chapter-intro { max-width: 560px; color: var(--muted); font-size: 12px; line-height: 1.65; margin: 0; position: relative; z-index: 1; }
.tip-card { display: flex; gap: 12px; align-items: flex-start; max-width: 580px; margin: 24px 0 21px; padding: 13px 15px; border: 1px solid rgba(255,116,76,.18); border-radius: 10px; background: rgba(255,116,76,.055); position: relative; z-index: 1; }
.tip-spark { color: var(--accent); font-size: 16px; }
.tip-card p { color: var(--text); font-size: 11px; margin: 5px 0 0; line-height: 1.5; }
.chapter-tools { display: grid; grid-template-columns: 1fr 1fr; gap: 27px; position: relative; z-index: 1; }
.tool-block ul { color: var(--muted); padding-left: 18px; margin: 12px 0 0; font-size: 11px; line-height: 1.85; }
.flash-formula { min-height: 54px; margin-top: 12px; display: flex; align-items: center; padding: 0 15px; color: var(--mint); background: rgba(131,216,176,.05); border-left: 2px solid var(--mint); font-family: Georgia, serif; font-size: 17px; }
.chapter-action { margin-top: 23px; padding: 0; color: var(--accent-2); background: transparent; font-size: 10px; position: relative; z-index: 1; }
.chapter-action span, .next-problem span { margin-left: 8px; font-size: 15px; }
.olympiad-section { padding: 0 0 78px; }
.olympiad-header { display: flex; align-items: end; justify-content: space-between; margin-bottom: 24px; }
.olympiad-header h2 { margin-top: 11px; }
.olympiad-header p { color: var(--muted); font-size: 12px; margin: 11px 0 0; }
.olympiad-score { min-width: 145px; text-align: right; }
.olympiad-score strong { display: block; color: var(--accent); font-family: Georgia, serif; font-size: 32px; font-weight: 400; line-height: 1; margin: 6px 0; }
.olympiad-score strong small { color: var(--muted-2); font-family: var(--font); font-size: 13px; }
.olympiad-score > span:last-child { color: var(--muted-2); font-size: 9px; }
.olympiad-grid { display: grid; grid-template-columns: 1.25fr .75fr; gap: 18px; }
.olympiad-card, .olympiad-aside { padding: 28px; }
.olympiad-card { min-height: 310px; background: radial-gradient(circle at 94% 100%, rgba(255,116,76,.09), transparent 30%), var(--surface); }
.problem-meta { margin-bottom: 27px; }
.problem-meta #problemNumber { font-family: var(--mono); }
.olympiad-card h3 { font-family: Georgia, serif; font-weight: 400; font-size: 26px; letter-spacing: -.045em; margin: 0 0 14px; }
.problem-statement { max-width: 650px; color: var(--text); font-family: Georgia, serif; font-size: 18px; line-height: 1.55; margin: 0; }
.problem-statement strong { color: var(--accent-2); font-weight: 400; }
.problem-actions { display: flex; align-items: center; gap: 10px; margin-top: 31px; }
.outline-button { min-height: 43px; padding: 0 15px; color: var(--muted); border: 1px solid var(--line-strong); border-radius: 9px; background: transparent; font-size: 11px; transition: .2s; }
.outline-button:hover { color: var(--text); border-color: var(--accent); }
.mini-solve { height: 43px; margin: 0; flex: 0 0 auto; width: auto; padding-left: 17px; }
.mini-solve .solve-arrow { margin: 0 0 0 17px; }
.hint-line { min-height: 18px; color: var(--accent-2); font-size: 11px; margin-top: 13px; }
.problem-answer { max-width: 650px; margin-top: 19px; padding: 13px 15px; border-left: 2px solid var(--mint); background: rgba(131,216,176,.06); animation: reveal .3s ease both; }
.problem-answer p { color: var(--text); font-size: 12px; line-height: 1.55; margin: 6px 0 0; }
.olympiad-aside { min-height: 310px; display: flex; flex-direction: column; align-items: flex-start; background: linear-gradient(145deg, rgba(138,171,255,.08), rgba(21,25,35,.65)); }
.aside-icon { color: var(--blue); font-family: Georgia, serif; font-size: 29px; margin-bottom: 17px; }
.olympiad-aside h3 { font-size: 19px; line-height: 1.2; margin: 10px 0; }
.olympiad-aside p { color: var(--muted); font-size: 11px; line-height: 1.6; margin: 0; }
.olympiad-pills { display: flex; flex-wrap: wrap; gap: 5px; margin-top: auto; }
.olympiad-pills span { padding: 5px 8px; border-radius: 5px; border: 1px solid var(--line); color: var(--muted); font-size: 9px; }
.next-problem { padding: 0; margin-top: 20px; color: var(--blue); background: none; font-size: 10px; }
@media (max-width: 940px) { .curriculum-layout, .olympiad-grid { grid-template-columns: 1fr; } .chapter-list { display: grid; grid-template-columns: repeat(2, 1fr); } .rail-footer { margin-top: 14px; } }
@media (max-width: 650px) { .curriculum-note { display: none; } .chapter-rail, .chapter-detail, .olympiad-card, .olympiad-aside { padding: 21px 17px; } .chapter-list { display: flex; } .chapter-detail h3 { font-size: 21px; } .chapter-tools { grid-template-columns: 1fr; gap: 14px; } .olympiad-header { display: block; } .olympiad-score { text-align: left; margin-top: 20px; } .problem-statement { font-size: 16px; } .problem-actions { align-items: stretch; flex-direction: column; } .mini-solve, .outline-button { width: 100%; } }