.material-page {
    --material-ink: #17212b;
    --material-muted: #66717e;
    --material-line: #dce2e7;
    --material-surface: #f5f7f8;
    --material-brand: #17677c;
    --material-accent: #d94b3d;
    color: var(--material-ink);
    background: #fff;
    min-height: 70vh;
}
.material-shell { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }
.material-heading { padding: 72px 0 54px; background: #eef5f6; border-bottom: 1px solid #d8e3e5; }
.material-heading-compact { padding: 46px 0 40px; }
.material-eyebrow { color: var(--material-brand); font-size: 12px; line-height: 1.4; font-weight: 750; margin: 0 0 12px; }
.material-heading h1 { max-width: 900px; margin: 0; font-size: 44px; line-height: 1.12; font-weight: 750; letter-spacing: 0; }
.material-intro { max-width: 720px; margin: 18px 0 0; color: var(--material-muted); font-size: 17px; line-height: 1.7; }
.material-summary { display: flex; align-items: center; gap: 9px; margin-top: 25px; color: #44515c; font-size: 14px; }
.material-summary strong { color: var(--material-ink); font-size: 18px; }
.material-summary span { width: 4px; height: 4px; border-radius: 50%; background: var(--material-accent); }
.material-breadcrumb { display: flex; flex-wrap: wrap; gap: 9px; margin: 0 0 22px; color: var(--material-muted); font-size: 13px; }
.material-breadcrumb a { color: var(--material-brand); text-decoration: none; }
.material-chapters, .material-modules { padding-top: 54px; padding-bottom: 80px; }
.material-section-title { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 27px; }
.material-section-title h2 { margin: 0; font-size: 30px; line-height: 1.2; letter-spacing: 0; }
.material-search input { width: 280px; min-height: 42px; border: 1px solid #cfd8dd; border-radius: 4px; padding: 9px 13px; font: inherit; color: var(--material-ink); background: #fff; }
.material-search input:focus { outline: 2px solid rgba(23,103,124,.2); border-color: var(--material-brand); }
.material-chapter-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 1px solid var(--material-line); }
.material-chapter-card[hidden] { display: none !important; }
.material-chapter-card { display: grid; grid-template-columns: 48px minmax(0,1fr) 28px; align-items: center; gap: 17px; min-height: 116px; padding: 19px 22px; color: var(--material-ink); text-decoration: none; border-bottom: 1px solid var(--material-line); transition: background .18s ease, transform .18s ease; }
.material-chapter-card:nth-child(odd) { border-right: 1px solid var(--material-line); }
.material-chapter-card:hover { background: #f5fafb; }
.material-number { display: grid; place-items: center; width: 46px; height: 46px; color: #fff; background: var(--material-brand); border-radius: 6px; font-size: 14px; font-weight: 750; }
.material-chapter-card:nth-child(4n+2) .material-number, .material-chapter-card:nth-child(4n+3) .material-number { background: #384b5b; }
.material-chapter-card h3 { margin: 0 0 7px; font-size: 17px; line-height: 1.35; letter-spacing: 0; }
.material-chapter-card p { margin: 0; color: var(--material-muted); font-size: 13px; }
.material-arrow { color: var(--material-accent); font-size: 21px; transition: transform .18s ease; }
.material-chapter-card:hover .material-arrow, .material-module-row:hover .material-arrow { transform: translateX(4px); }
.material-no-results, .material-empty { padding: 28px; border: 1px solid var(--material-line); background: var(--material-surface); color: var(--material-muted); text-align: center; }
.material-count { color: var(--material-muted); font-size: 14px; }
.material-module-list { border-top: 1px solid var(--material-line); }
.material-module-row { display: grid; grid-template-columns: 54px minmax(0,1fr) 28px; align-items: center; gap: 18px; padding: 22px 10px; color: var(--material-ink); text-decoration: none; border-bottom: 1px solid var(--material-line); transition: background .18s ease; }
.material-module-row:hover { background: #f8fafb; }
.material-module-index { color: var(--material-brand); font-size: 13px; font-weight: 750; }
.material-module-name h3 { margin: 0 0 9px; font-size: 18px; line-height: 1.35; letter-spacing: 0; }
.material-formats { display: flex; flex-wrap: wrap; gap: 7px; }
.material-formats span { padding: 4px 8px; border: 1px solid #d7e0e4; border-radius: 3px; color: #58646e; background: #fff; font-size: 11px; font-weight: 650; }
.material-learning-layout { display: grid; grid-template-columns: 260px minmax(0,1fr); gap: 48px; padding-top: 46px; padding-bottom: 84px; align-items: start; }
.material-learning-layout > * { min-width: 0; max-width: 100%; }
.material-module-nav { position: sticky; top: 92px; width: 100%; border-right: 1px solid var(--material-line); padding-right: 24px; }
.material-nav-label { margin: 0 0 7px; color: var(--material-brand); font-size: 11px; font-weight: 750; }
.material-module-nav h2 { margin: 0 0 22px; font-size: 17px; line-height: 1.4; letter-spacing: 0; }
.material-module-links { display: grid; width: 100%; max-width: 100%; max-height: calc(100vh - 240px); overflow-y: auto; }
.material-module-links a { padding: 10px 11px; border-left: 3px solid transparent; color: #596671; font-size: 13px; line-height: 1.4; text-decoration: none; }
.material-module-links a:hover { color: var(--material-brand); background: #f5f8f9; }
.material-module-links a.active { color: var(--material-ink); background: #edf4f5; border-left-color: var(--material-accent); font-weight: 700; }
.material-learning-content { min-width: 0; width: 100%; max-width: 100%; overflow: hidden; }
.material-tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--material-line); margin-bottom: 30px; }
.material-tabs button { appearance: none; border: 0; border-bottom: 3px solid transparent; padding: 12px 18px; color: #5d6872; background: transparent; font: inherit; font-weight: 650; cursor: pointer; }
.material-tabs button:hover { color: var(--material-brand); }
.material-tabs button.active { color: var(--material-ink); border-bottom-color: var(--material-accent); }
.material-tabs button span { margin-left: 4px; color: var(--material-muted); font-size: 11px; }
.material-tab-panel { display: none; }
.material-tab-panel.active { display: block; }
.material-rich-content { color: #303b45; font-size: 16px; line-height: 1.75; overflow-wrap: anywhere; }
.material-rich-content h2, .material-rich-content h3, .material-rich-content h4 { margin: 30px 0 12px; line-height: 1.35; letter-spacing: 0; color: var(--material-ink); }
.material-rich-content h2 { font-size: 25px; }
.material-rich-content h3 { font-size: 21px; }
.material-rich-content h4 { font-size: 18px; }
.material-rich-content p { margin: 0 0 17px; }
.material-rich-content ul, .material-rich-content ol { margin: 0 0 20px; padding-left: 24px; }
.material-rich-content li { margin-bottom: 7px; }
.material-rich-content img { display: block; max-width: 100%; height: auto; margin: 24px auto; }
.material-rich-content table { width: 100%; border-collapse: collapse; margin: 24px 0; font-size: 14px; }
.material-rich-content th, .material-rich-content td { padding: 10px; border: 1px solid #d5dde1; text-align: left; vertical-align: top; }
.material-rich-content th { background: #eef3f4; }
.material-rich-content blockquote { margin: 22px 0; padding: 15px 20px; border-left: 4px solid var(--material-brand); background: #f3f7f8; }
.material-video-list { display: grid; gap: 30px; }
.material-video-frame { position: relative; aspect-ratio: 16 / 9; background: #111; overflow: hidden; }
.material-video-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.material-video h3 { margin: 11px 0 0; font-size: 16px; letter-spacing: 0; }
.material-video-unavailable { display: grid; place-items: center; align-content: center; min-height: 280px; padding: 30px; background: #f4f6f7; border: 1px solid var(--material-line); color: var(--material-muted); text-align: center; }
.material-video-unavailable span { display: grid; place-items: center; width: 42px; height: 42px; margin-bottom: 13px; border: 2px solid #b8c2c8; border-radius: 50%; color: #66747d; font-size: 22px; font-weight: 750; }
.material-video-unavailable strong { color: var(--material-ink); font-size: 18px; }
.material-video-unavailable p { margin: 7px 0 0; }
.material-page { -webkit-user-select: none; user-select: none; }
.material-page input, .material-page textarea, .material-page select { -webkit-user-select: text; user-select: text; }
.material-page img { -webkit-user-drag: none; user-drag: none; }
.material-protection-notice { position: fixed; inset: 0; z-index: 2147483647; display: grid; place-items: center; padding: 20px; background: rgba(20, 29, 35, .64); }
.material-protection-notice[hidden], .material-capture-curtain[hidden] { display: none !important; }
.material-protection-dialog { width: min(100%, 420px); padding: 30px; border-radius: 6px; background: #fff; box-shadow: 0 18px 55px rgba(0, 0, 0, .24); color: var(--material-ink); text-align: center; }
.material-protection-dialog h2 { margin: 12px 0 9px; font-size: 23px; letter-spacing: 0; }
.material-protection-dialog p { margin: 0 0 21px; color: var(--material-muted); line-height: 1.55; }
.material-protection-dialog button { min-width: 92px; padding: 10px 18px; border: 0; border-radius: 4px; background: var(--material-brand); color: #fff; font: inherit; font-weight: 700; cursor: pointer; }
.material-protection-icon { display: grid; place-items: center; width: 48px; height: 48px; margin: 0 auto; border: 2px solid #d46a6a; border-radius: 50%; color: #c44f4f; font-size: 25px; font-weight: 750; }
.material-capture-curtain { position: fixed; inset: 0; z-index: 2147483646; background: #fff; }
.material-not-found { padding-top: 90px; padding-bottom: 100px; }
.material-not-found h1 { margin: 0 0 12px; font-size: 40px; letter-spacing: 0; }
.material-not-found p { color: var(--material-muted); }
.material-back-button { display: inline-block; margin-top: 18px; color: var(--material-brand); font-weight: 700; text-decoration: none; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
@media print {
    body * { display: none !important; visibility: hidden !important; }
    html, body { min-height: 0 !important; background: #fff !important; }
}
@media (max-width: 900px) {
    .material-heading h1 { font-size: 36px; }
    .material-learning-layout { grid-template-columns: 1fr; gap: 28px; }
    .material-module-nav { position: static; padding: 0 0 20px; border-right: 0; border-bottom: 1px solid var(--material-line); }
    .material-module-links { display: flex; max-height: none; overflow-x: auto; gap: 4px; }
    .material-module-links a { flex: 0 0 210px; border-left: 0; border-bottom: 3px solid transparent; }
    .material-module-links a.active { border-left: 0; border-bottom-color: var(--material-accent); }
}
@media (max-width: 700px) {
    .material-shell { width: min(100% - 28px, 1160px); }
    .material-heading { padding: 46px 0 38px; }
    .material-heading h1 { font-size: 31px; }
    .material-intro { font-size: 15px; }
    .material-summary { align-items: flex-start; flex-wrap: wrap; }
    .material-section-title { align-items: stretch; flex-direction: column; }
    .material-search input { width: 100%; }
    .material-chapter-grid { grid-template-columns: 1fr; }
    .material-chapter-card:nth-child(odd) { border-right: 0; }
    .material-chapter-card { min-height: 104px; padding: 16px 8px; grid-template-columns: 44px minmax(0,1fr) 22px; gap: 12px; }
    .material-number { width: 42px; height: 42px; }
    .material-chapter-card h3, .material-module-name h3 { font-size: 16px; }
    .material-module-row { grid-template-columns: 34px minmax(0,1fr) 20px; gap: 10px; padding: 18px 4px; }
    .material-learning-layout { padding-top: 30px; }
    .material-tabs { overflow-x: auto; }
    .material-tabs button { flex: 0 0 auto; padding: 11px 14px; }
    .material-rich-content { font-size: 15px; }
    .material-rich-content table { display: block; overflow-x: auto; white-space: nowrap; }
}