.study408 [hidden] { display: none !important; }
.study408 .subhero h1 { font-size: clamp(2.1rem, 4.6vw, 3.8rem); overflow-wrap: anywhere; }
.study408 .subhero p { max-width: 54rem; }
.study408 .section { padding-top: 36px; padding-bottom: 36px; }
.study408 .study-controls { padding-top: 0; }
.study408 fieldset { margin: 0; padding: 0; border: 0; min-width: 0; }
.study408 legend { font-size: 1.25rem; margin-bottom: 16px; }
.study-filter-grid { display: grid; grid-template-columns: 2fr repeat(4, 1fr); gap: 14px; }
.study-filter-grid label { display: grid; gap: 6px; color: var(--muted); min-width: 0; }
.study-filter-grid input, .study-filter-grid select { width: 100%; min-width: 0; border: 1px solid var(--line-strong); border-radius: 10px; background: var(--surface-strong); color: var(--text); padding: 10px 12px; min-height: 44px; font: inherit; }
.study-actions, .study-mark { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-top: 18px; }
.study408 button[aria-pressed="true"] { color: var(--text); background: var(--surface-soft); border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.study-note, .study-origin, .study-state-text { color: var(--muted); font-size: .9rem; }
.study408 #study-count { margin-top: 18px; }
.study-chapter { margin-top: 24px; }
.study-chapter > h3 { margin: 0 0 14px; font-size: 1.3rem; padding-left: 12px; border-left: 2px solid var(--accent); }
.study-card-list { display: grid; gap: 12px; }
.study-card { border: 1px solid var(--line); border-radius: var(--radius-md); overflow: hidden; scroll-margin-top: 165px; }
.study-card > summary { cursor: pointer; display: flex; gap: 12px; flex-wrap: wrap; align-items: center; padding: 20px 24px; list-style: none; min-height: 64px; }
.study-card > summary::-webkit-details-marker { display: none; }
.study-card > summary::before { content: '+'; color: var(--accent); font-size: 1.4rem; flex-shrink: 0; }
.study-card[open] > summary::before { content: '−'; }
.study-card-title { font-size: 1.2rem; flex: 1 1 320px; min-width: 0; overflow-wrap: anywhere; }
.study-badges { display: flex; gap: 6px; flex-wrap: wrap; }
.study-badge { border: 1px solid var(--line-strong); border-radius: 6px; padding: 2px 8px; color: var(--muted); font-size: .8rem; white-space: nowrap; }
.study-expand-hint { color: var(--muted); font-size: .85rem; }
.study-card[open] > summary { border-bottom: 1px solid var(--line); }
.study-card-body { padding: 4px 24px 24px; max-width: 100%; overflow-wrap: anywhere; }
.study-card-body h4 { font-size: 1.05rem; margin: 22px 0 8px; }
.study-card-body p { margin: 8px 0 16px; line-height: 1.85; }
.study-comparison { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.study-comparison > div { padding: 0 18px 4px; background: var(--surface-soft); border-radius: 10px; }
.study-comparison > div:last-child { border-left: 2px solid var(--accent); }
.study-recall { margin: 18px 0; border-top: 1px solid var(--line); padding-top: 16px; }
.study-recall summary { cursor: pointer; color: var(--accent); }
.study-recall p { margin-top: 12px; }
.study-card pre { white-space: pre; overflow-x: auto; max-width: 100%; padding: 18px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface-strong); font: .9rem/1.7 Consolas, monospace; }
.study-mark { border-top: 1px solid var(--line); padding-top: 16px; }
.study-mark .button { min-height: 44px; }
.study-reference li { margin-bottom: 8px; }
.study-reference a { text-decoration: underline; text-underline-offset: 3px; }
.study-empty { padding-top: 30px; padding-bottom: 30px; color: var(--muted); }
.study-card:target { border-color: var(--accent); }
.study408 :focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
@media (max-width: 1050px) { .study-filter-grid { grid-template-columns: repeat(2, 1fr); } .study-search { grid-column: 1/-1; } }
@media (max-width: 640px) { .study-comparison { grid-template-columns: 1fr; gap: 12px; } .study-card > summary { padding: 16px; gap: 8px; } .study-card-title { flex-basis: calc(100% - 35px); font-size: 1.1rem; } .study-badges { margin-left: 22px; } .study-card-body { padding: 4px 16px 20px; } .study408 .section { padding-top: 24px; padding-bottom: 24px; } .study-expand-hint { margin-left: auto; } }
@media print { .study-controls, .study-mark, .study-expand-hint { display: none !important; } .study-card { break-inside: auto; box-shadow: none; border-color: #aaa; background: transparent; } .study408 .section { padding: 12px 0; } .study-card > summary { break-after: avoid; } .study-comparison > div { background: transparent; } .study408 a { color: inherit; } }
.study-badge[data-tag="个人错题"] { color: var(--text); border-color: var(--accent); }
.study-badge[data-tag="近年考查"] { color: var(--success); }
.study-exams { padding: 12px 16px; background: var(--surface-soft); border-radius: 8px; }
.study-exams a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.study-sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.study-directory { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 16px; }
.study-directory ul { columns: 2; padding-left: 18px; }
.study-directory li { break-inside: avoid; margin-bottom: 8px; }
.study-directory a { text-decoration: underline; text-underline-offset: 3px; }
.study-chapter { scroll-margin-top: 165px; }
.study-table-wrap { overflow-x: auto; margin: 20px 0; }
.study-table { width: 100%; border-collapse: collapse; font-size: .95rem; }
.study-table caption { text-align: left; padding-bottom: 10px; font-weight: 600; }
.study-table th, .study-table td { text-align: left; vertical-align: top; padding: 12px; border: 1px solid var(--line); }
.study-table th { background: var(--surface-soft); }
.study-table td { min-width: 120px; }
.study-figure { margin: 24px 0; }
.study-diagram-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; }
.study-diagram-scroll svg { display: block; width: 100%; min-width: 720px; height: auto; --diagram-bg: var(--surface-strong); --diagram-fill: var(--surface-soft); --diagram-line: var(--accent); --diagram-text: var(--text); --diagram-muted: var(--muted); }
.study-figure figcaption { color: var(--muted); font-size: .85rem; margin-top: 10px; }
.study-figure a { text-decoration: underline; margin-left: 8px; }
.study-badge[data-tag="记忆概念"] { color: var(--accent); }
.study-badge[data-tag="图解"] { color: var(--text); border-style: dashed; }
@media(max-width:640px) { .study-directory { grid-template-columns: 1fr; } .study-directory ul { columns: 1; } }
@media print { .study-directory { display: none; } .study-diagram-scroll svg { min-width: 0; --diagram-bg: #fff; --diagram-fill: #f1f4f8; --diagram-line: #58677a; --diagram-text: #17212f; --diagram-muted: #46566b; } .study-diagram-scroll { overflow: visible; } .study-table td { min-width: 0; } .study-figure { break-inside: avoid; } }