/* R19: all layout changes stay within the materials page. */
.materials-page {
    --mat-muted: #626b7d;
    --mat-font: var(--font-body);
    font-family: var(--mat-font);
    font-optical-sizing: auto;
}
.materials-page :is(h1, h2, h3, h4, h5, h6, input, select, textarea, button, summary, .logo-title, .nav-link, .mat-card-code) {
    font-family: var(--mat-font);
}
.materials-page .navbar .btn { font-family: var(--mat-font); }
.mat-sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.materials-page .sub-hero { min-height: 0; padding: 106px 0 32px; }
.materials-page .sub-hero-content { padding: 0; width: calc(100% - 48px); }
.materials-page .sub-hero .breadcrumb { margin-bottom: 16px; }
.materials-page .sub-hero .hero-title { font-size: clamp(28px, 3.2vw, 42px); line-height: 1.25; margin-bottom: 12px; padding-bottom: 0; }
.materials-page .sub-hero .hero-title::after { display: none; }
.materials-page .sub-hero .hero-subtitle { font-size: 15px; line-height: 1.7; max-width: 760px; margin: 0; color: #d2d7e7; }
.materials-page #materialsSection { padding: 32px 0 64px; scroll-margin-top: 90px; }
.materials-page .mat-toolbar { gap: 12px; margin-bottom: 14px; align-items: stretch; }
.materials-page .mat-search { min-width: 230px; }
.materials-page .materials-search { height: 44px; font-size: 15px; border-radius: 8px; }
.materials-page .mat-select-wrap { display: flex; align-items: center; gap: 8px; color: var(--mat-muted); font-size: 13px; }
.materials-page .mat-select-wrap select { color: var(--primary); background: white; border: 1px solid var(--border-strong); border-radius: 8px; min-height: 44px; padding: 0 28px 0 12px; font: inherit; max-width: 100%; }
.materials-page .mat-note { font-size: 13px; color: var(--mat-muted); margin: 0 0 20px; min-height: 21px; }
.materials-page .mat-cards { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.materials-page .mat-card { padding: 20px; border-radius: 10px; display: flex; flex-direction: column; min-width: 0; align-items: stretch; }
.materials-page .mat-card-code { font: 600 14px/1.5 var(--mat-font); letter-spacing: .02em; color: var(--blue); padding-right: 14px; overflow-wrap: anywhere; }
.materials-page .mat-card-name { font-size: 18px; line-height: 1.55; font-weight: 600; color: var(--primary); margin: 8px 0 20px; overflow-wrap: anywhere; }
.materials-page .mat-card-foot { margin-top: auto; padding-top: 12px; border-top: 1px solid var(--border); flex-wrap: wrap; gap: 4px 12px; }
.materials-page .mat-card-meta { font-size: 13px; line-height: 1.6; color: var(--mat-muted); }
.materials-page .mat-card-grade { font-size: 12px; color: var(--mat-muted); }
.materials-page .mat-card-mark { top: 20px; right: 20px; }
.materials-page .mat-detail-back { min-height: 40px; margin-bottom: 12px; font-size: 14px; }
.materials-page .mat-tp-head { gap: 16px; }
.materials-page .mat-tp-head-copy { min-width: 0; flex: 1 1 300px; }
.materials-page .mat-tp-head h2 { font-size: clamp(22px, 2.2vw, 28px); line-height: 1.4; overflow-wrap: anywhere; }
.materials-page .mat-tp-head-meta { font-size: 13px; color: var(--mat-muted); line-height: 1.7; }
.materials-page .mat-tp-head-actions { flex-wrap: wrap; }
.materials-page .mat-tp-head-actions .btn { min-height: 40px; }
.materials-page .mat-tp-detail-search { max-width: 480px; margin: 24px 0; }
.materials-page .mat-tp-section-head { font-size: 16px; gap: 10px; padding: 14px 0; min-height: 48px; }
.materials-page .mat-tp-section-title { flex: 1; min-width: 0; overflow-wrap: anywhere; }
.materials-page .mat-tp-section-count { font-size: 12px; color: var(--mat-muted); flex-shrink: 0; }
.materials-page .material-row { grid-template-columns: 26px minmax(0, 1fr) auto; gap: 12px 16px; padding: 18px 4px; scroll-margin-top: 96px; }
.materials-page .material-row-icon { align-self: start; padding-top: 3px; font-size: 21px; }
.materials-page .material-row-copy { min-width: 0; }
.materials-page .material-row-name { white-space: normal; overflow: visible; text-overflow: clip; overflow-wrap: anywhere; font-size: 17px; line-height: 1.7; }
.materials-page .material-row-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 5px 12px; margin-top: 8px; color: var(--mat-muted); font-size: 13px; line-height: 1.65; }
.materials-page .mat-vis { padding: 2px 8px; font-size: 12px; }
.materials-page .material-row-action { gap: 8px; flex-wrap: wrap; max-width: 300px; }
.materials-page .mat-act { width: auto; min-width: 72px; height: auto; min-height: 40px; padding: 8px 12px; gap: 6px; font-size: 13px; line-height: 1.4; }
.materials-page .mat-act[data-action="download"], .materials-page .mat-act[data-action="buy"] { background: var(--primary); color: white; }
.materials-page .mat-act:disabled { cursor: default; opacity: .65; }
.materials-page .material-row:target { background: #eef4fa; outline: 2px solid #0071b8; outline-offset: 4px; border-radius: 6px; }
.materials-page .mat-tp-files[hidden] { display: none; }
.materials-page .material-empty { grid-column: 1 / -1; width: 100%; padding: 48px 20px; background: #f6f8fc; border: 1px dashed var(--border-strong); border-radius: 10px; color: var(--primary); }
.materials-page .material-empty span { color: var(--mat-muted); font-size: 14px; line-height: 1.7; }
.materials-page .material-empty .btn { margin-top: 18px; min-height: 44px; }
.materials-page .mat-legend { display: block; margin-top: 32px; padding: 18px 0 0; }
.materials-page .mat-legend summary { cursor: pointer; color: var(--primary); font-size: 14px; font-weight: 600; padding: 8px 0; }
.materials-page .mat-legend-body { padding: 12px 0; }
.materials-page .mat-legend-sub, .materials-page .mat-legend-txt, .materials-page .mat-legend-foot { font-size: 13px; line-height: 1.7; color: var(--mat-muted); }
.materials-page .preview-tool { width: 44px; height: 44px; }
.materials-page .preview-title span { max-width: none; }
.materials-page .preview-status { padding: 24px; text-align: center; }
.materials-page .preview-modal { animation: none; }
.materials-page .preview-body { min-height: 0; }
.preview-pdf-container { position: absolute; inset: 0; overflow: auto; overscroll-behavior: contain; touch-action: pan-x pan-y; }
.preview-pdf-container[hidden], .preview-reader-tools[hidden], .preview-find[hidden] { display: none; }
.preview-reader-tools, .preview-find { display: flex; align-items: center; gap: 4px; padding: 4px 12px; background: #f6f8fc; border-bottom: 1px solid #d6dbe4; color: #182c49; flex: none; }
.preview-reader-tools { flex-wrap: wrap; }
.materials-page .preview-reader-tools .preview-tool { width: 36px; height: 40px; }
.preview-reader-tools input { width: 52px; padding: 6px; border: 1px solid #a8bad1; border-radius: 4px; font: inherit; text-align: center; }
.preview-reader-tools input::-webkit-inner-spin-button { -webkit-appearance: none; }
.preview-find input { min-width: 0; flex: 1; padding: 8px; border: 1px solid #a8bad1; border-radius: 4px; font: inherit; }
.preview-find span { font-size: 12px; white-space: nowrap; }
.preview-pdf-container .pdfViewer { --page-margin: 8px auto; --page-border: none; }
.preview-pdf-container:focus-visible { outline: 2px solid #0071b8; outline-offset: -2px; }
.materials-page .preview-tool:disabled { opacity: .4; cursor: default; }
@media (max-width: 560px) {
    .preview-reader-tools, .preview-find { padding-inline: 6px; gap: 2px; }
    .materials-page .preview-reader-tools .preview-tool { width: 32px; }
    .preview-reader-tools input { width: 42px; }
}
.materials-page :is(button, a, input, select, summary):focus-visible { outline: 3px solid #0071b8; outline-offset: 3px; }
.materials-page .mat-search-status { color: var(--mat-muted); font-size: 13px; margin: 0 0 14px; }
.materials-page .footer-grid { padding-left: 0; }
.materials-page .mat-folder-nav { display: flex; gap: 8px; border-bottom: 1px solid var(--border); margin-top: 28px; flex-wrap: wrap; }
.materials-page .mat-folder-nav button { display: flex; align-items: center; justify-content: center; gap: 12px; flex: 1 1 auto; padding: 18px 14px; min-height: 56px; border: 0; border-bottom: 3px solid transparent; background: transparent; color: var(--mat-muted); font: 500 16px/1.5 var(--mat-font); cursor: pointer; transition: color .18s, background .18s, border-color .18s; }
.materials-page .mat-folder-nav button[aria-selected="true"] { color: var(--primary); border-bottom-color: var(--blue); background: #f0f5fa; font-weight: 600; }
.materials-page .mat-folder-nav button:hover { background: #f5f8fc; }
.materials-page .mat-folder-count { font-size: 12px; font-weight: 500; font-variant-numeric: tabular-nums; background: #edf0f4; padding: 2px 7px; border-radius: 4px; color: var(--mat-muted); }
.materials-page .mat-folder-nav button[aria-selected="true"] .mat-folder-count { background: #dfeaf4; color: var(--primary); }
.materials-page .mat-tp-detail-search { max-width: none; margin: 24px 0 0; }
.materials-page .mat-board-summary { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; padding: 26px 0 22px; }
.materials-page .mat-board-summary h3 { font-size: 21px; line-height: 1.4; letter-spacing: -.02em; margin: 0 0 8px; color: var(--primary); }
.materials-page .mat-board-summary p { font-size: 14px; line-height: 1.65; max-width: 65ch; color: var(--mat-muted); margin: 0; }
.materials-page .mat-board-total { flex-shrink: 0; color: var(--mat-muted); font-size: 13px; line-height: 1.7; font-variant-numeric: tabular-nums; }
.materials-page .mat-list-labels { display: flex; justify-content: space-between; padding: 12px 4px; border-block: 1px solid var(--border); color: var(--mat-muted); font-size: 12px; letter-spacing: .03em; }
.materials-page .material-row:hover { background: #f7f9fc; }
.materials-page .material-row[data-reveal] { opacity: 1; transform: none; filter: none; transition: none; will-change: auto; }
.materials-page .material-empty { border-style: solid; border-color: var(--border); background: #f8f9fb; }
@media (max-width: 600px) {
    .materials-page .mat-folder-nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 4px 8px; margin-top: 20px; }
    .materials-page .mat-folder-nav button { padding: 12px 8px; font-size: 14px; gap: 6px; justify-content: space-between; text-align: left; min-width: 0; }
    .materials-page .mat-folder-nav button > span:first-child { overflow-wrap: anywhere; }
    .materials-page .mat-folder-nav button:last-child:nth-child(odd) { grid-column: 1 / -1; }
    .materials-page .mat-board-summary { gap: 12px; padding: 22px 0 18px; }
    .materials-page .mat-board-summary h3 { font-size: 19px; }
    .materials-page .mat-board-summary p { font-size: 13px; }
    .materials-page .mat-list-labels { display: none; }
}
@media (max-width: 1024px) {
    .materials-page .mat-cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .materials-page .material-row-action { max-width: 220px; }
}
@media (prefers-reduced-motion: reduce) {
    .materials-page .mat-folder-nav button { transition: none; }
}
@media (max-width: 600px) {
    .materials-page .sub-hero { padding: 90px 0 24px; }
    .materials-page .sub-hero-content { width: calc(100% - 36px); }
    .materials-page .sub-hero .breadcrumb { margin-bottom: 12px; }
    .materials-page #materialsSection { padding: 24px 0 44px; }
    .materials-page .mat-search { flex: 1 0 100%; min-width: 0; }
    .materials-page .mat-select-wrap { flex: 1; min-width: 0; gap: 6px; }
    .materials-page .mat-select-wrap select { min-width: 0; flex: 1; padding-left: 8px; padding-right: 4px; }
    .materials-page .mat-cards { grid-template-columns: minmax(0, 1fr); gap: 12px; }
    .materials-page .mat-card { padding: 18px; }
    .materials-page .mat-card-name { margin-bottom: 14px; }
    .materials-page .material-row { grid-template-columns: 22px minmax(0, 1fr); gap: 10px; padding: 18px 0; }
    .materials-page .material-row-action { grid-column: 2; max-width: none; justify-content: flex-start; }
    .materials-page .mat-act { min-height: 44px; }
    .materials-page .mat-tp-section-count { max-width: 80px; text-align: right; }
    .materials-page .mat-legend-grid { grid-template-columns: 1fr; }
}

/* 2026-10-09 课程卡片黑板封面：上半部分为学科黑板图，下半部分沿用原信息区。 */
.materials-page .mat-card { padding: 0; border-radius: 14px; overflow: hidden; transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease; }
.materials-page .mat-card:hover { border-color: var(--border-strong); box-shadow: 0 10px 25px -5px rgba(1,5,68,.12), 0 8px 10px -6px rgba(1,5,68,.06); transform: translateY(-2px); }
.materials-page .mat-card:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; }
.materials-page .mat-card-cover { position: relative; display: block; height: 124px; background: linear-gradient(135deg, #010544 0%, #1a1f63 100%); overflow: hidden; }
.materials-page .mat-card-board { position: absolute; inset: 0; background-repeat: no-repeat; background-size: 240% auto; opacity: .5; filter: grayscale(1) brightness(1.55); transition: transform .35s ease, opacity .35s ease; }
.materials-page .mat-card:hover .mat-card-board { transform: scale(1.06); opacity: .68; }
.materials-page .mat-card-shade { position: absolute; inset: 0; background: linear-gradient(100deg, rgba(0,3,47,.92) 0%, rgba(1,5,68,.62) 46%, rgba(1,5,68,.22) 100%); }
.materials-page .mat-card-label { position: absolute; left: 20px; right: 44px; bottom: 16px; display: flex; flex-direction: column; gap: 2px; color: #f8f7fb; }
.materials-page .mat-card-subject { font-size: 13px; font-style: italic; color: rgba(247,245,251,.78); }
.materials-page .mat-card-cover .mat-card-code { font-family: var(--font-heading); font-size: 26px; line-height: 1.15; font-weight: 600; letter-spacing: .03em; color: #f8f7fb; padding-right: 0; }
.materials-page .mat-card-subject-alt { font-family: var(--font-heading); font-size: 22px; line-height: 1.2; font-weight: 600; font-style: italic; }
.materials-page .mat-card-cover .mat-card-mark { top: 14px; right: 16px; z-index: 1; }
.materials-page .mat-card-body { display: flex; flex-direction: column; flex: 1; padding: 16px 20px 18px; }
.materials-page .mat-card-name { display: block; margin: 0 0 16px; font-size: 19px; line-height: 1.45; }
.materials-page .mat-cover-analysis { background-image: url('../images/hero-blackboard-analysis-1024w.webp'); }
.materials-page .mat-cover-linear { background-image: url('../images/hero-blackboard-linear-1024w.webp'); }
.materials-page .mat-cover-probability { background-image: url('../images/hero-blackboard-probability-1024w.webp'); }
.materials-page .mat-cover-statistics { background-image: url('../images/hero-blackboard-statistics-1024w.webp'); }
.materials-page .mat-cover-complex { background-image: url('../images/hero-blackboard-complex-1024w.webp'); }
.materials-page .mat-cover-ode { background-image: url('../images/hero-blackboard-ode-1024w.webp'); }
.materials-page .mat-cover-algebra { background-image: url('../images/hero-blackboard-algebra-1024w.webp'); }
.materials-page .mat-cover-functional { background-image: url('../images/hero-blackboard-functional-1024w.webp'); }
.materials-page .mat-cover-or { background-image: url('../images/hero-blackboard-or-1024w.webp'); }
.materials-page .mat-cover-default { background-image: url('../images/hero-math-blackboard-v1-1024w.webp'); }
.materials-page .mat-pos-0 { background-position: 62% 28%; }
.materials-page .mat-pos-1 { background-position: 40% 62%; }
.materials-page .mat-pos-2 { background-position: 82% 30%; }
.materials-page .mat-pos-3 { background-position: 24% 42%; }
.materials-page .mat-pos-4 { background-position: 58% 76%; }
@media (max-width: 600px) {
    .materials-page .mat-card-cover { height: 88px; }
    .materials-page .mat-card-board { background-size: 300% auto; }
    .materials-page .mat-card-label { left: 18px; bottom: 12px; }
    .materials-page .mat-card-cover .mat-card-code { font-size: 22px; }
    .materials-page .mat-card-subject-alt { font-size: 19px; }
    .materials-page .mat-card-body { padding: 14px 18px 16px; }
    .materials-page .mat-card-name { font-size: 17px; margin-bottom: 12px; }
}
@media (prefers-reduced-motion: reduce) {
    .materials-page .mat-card, .materials-page .mat-card-board { transition: none; }
    .materials-page .mat-card:hover, .materials-page .mat-card:hover .mat-card-board { transform: none; }
}

/* 2026-10-09 课程详情页：黑板封面课程头 + 板块标签 + 不分周资料表 + 右侧获取状态 */
.materials-page .mat-course-hero { display: none; position: relative; overflow: hidden; background: linear-gradient(135deg, #010544 0%, #1a1f63 100%); color: #fff; }
.materials-page.mat-in-detail .mat-course-hero { display: block; }
.materials-page.mat-in-detail .sub-hero { display: none; }
.materials-page .mat-course-hero-board { position: absolute; inset: 0; background-repeat: no-repeat; background-size: 120% auto; background-position: 58% 22%; opacity: .42; filter: grayscale(1) brightness(1.55); }
.materials-page .mat-course-hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(100deg, rgba(0,3,47,.92) 0%, rgba(1,5,68,.66) 50%, rgba(1,5,68,.30) 100%); }
.materials-page .mat-hero-analysis { background-image: url('../images/hero-blackboard-analysis.webp'); }
.materials-page .mat-hero-linear { background-image: url('../images/hero-blackboard-linear.webp'); }
.materials-page .mat-hero-probability { background-image: url('../images/hero-blackboard-probability.webp'); }
.materials-page .mat-hero-statistics { background-image: url('../images/hero-blackboard-statistics.webp'); }
.materials-page .mat-hero-complex { background-image: url('../images/hero-blackboard-complex.webp'); }
.materials-page .mat-hero-ode { background-image: url('../images/hero-blackboard-ode.webp'); }
.materials-page .mat-hero-algebra { background-image: url('../images/hero-blackboard-algebra.webp'); }
.materials-page .mat-hero-functional { background-image: url('../images/hero-blackboard-functional.webp'); }
.materials-page .mat-hero-or { background-image: url('../images/hero-blackboard-or.webp'); }
.materials-page .mat-hero-default { background-image: url('../images/hero-math-blackboard-v1.webp'); }
.materials-page .mat-course-hero-inner { position: relative; z-index: 1; max-width: 1200px; margin: 0 auto; padding: 100px 32px 40px; box-sizing: border-box; display: flex; flex-direction: column; gap: 18px; }
.materials-page .mat-course-hero .mat-detail-back { align-self: flex-start; min-height: 36px; margin: 0; gap: 4px; font-size: 14px; color: rgba(255,255,255,.8); }
.materials-page .mat-course-hero .mat-detail-back:hover { color: #fff; }
.materials-page .mat-course-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; flex-wrap: wrap; }
.materials-page .mat-course-head-copy { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.materials-page .mat-course-subject { font-size: 15px; font-style: italic; color: rgba(247,245,251,.78); }
.materials-page .mat-course-title { margin: 0; display: flex; align-items: baseline; gap: 6px 18px; flex-wrap: wrap; font-weight: 600; color: #f8f7fb; overflow-wrap: anywhere; }
.materials-page .mat-course-title:focus { outline: none; }
.materials-page .mat-course-title:focus-visible { outline: 3px solid rgba(255,255,255,.7); outline-offset: 4px; }
.materials-page .mat-course-code { font-family: var(--font-heading); font-size: clamp(34px, 4vw, 48px); line-height: 1.15; letter-spacing: .02em; }
.materials-page .mat-course-name { font-size: clamp(24px, 2.6vw, 34px); line-height: 1.3; }
.materials-page .mat-course-chips { list-style: none; margin: 6px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.materials-page .mat-course-chips li { padding: 4px 12px; border: 1px solid rgba(255,255,255,.24); border-radius: 999px; font-size: 14px; line-height: 1.5; color: rgba(255,255,255,.88); }
.materials-page .mat-course-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.materials-page .mat-hero-btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; min-height: 40px; padding: 0 16px; background: transparent; border: 1px solid rgba(255,255,255,.3); border-radius: 10px; color: #fff; font: inherit; font-size: 14px; cursor: pointer; transition: background .18s ease, border-color .18s ease; }
.materials-page .mat-hero-btn:hover { background: rgba(255,255,255,.1); border-color: rgba(255,255,255,.5); }
.materials-page .mat-hero-btn[aria-pressed="true"] { background: rgba(255,255,255,.08); }
.materials-page .mat-hero-star { fill: none; }
.materials-page .mat-hero-btn[aria-pressed="true"] .mat-hero-star { fill: var(--gold); stroke: var(--gold); }
.materials-page.mat-in-detail #materialsSection { padding-top: 28px; }

.materials-page .mat-detail-layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 40px; align-items: start; }
.materials-page .mat-detail-main { min-width: 0; display: flex; flex-direction: column; gap: 20px; }
.materials-page .mat-folder-nav { display: flex; gap: 28px; margin: 0; border-bottom: 1px solid var(--border); flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; }
.materials-page .mat-folder-nav::-webkit-scrollbar { display: none; }
.materials-page .mat-folder-nav button { flex: 0 0 auto; gap: 8px; min-height: 48px; padding: 12px 2px; margin-bottom: -1px; border-bottom: 2px solid transparent; background: transparent; color: var(--text-secondary); font-size: 15px; font-weight: 400; }
.materials-page .mat-folder-nav button:hover { background: transparent; color: var(--primary); }
.materials-page .mat-folder-nav button[aria-selected="true"] { color: var(--primary); font-weight: 600; background: transparent; border-bottom-color: var(--accent); }
.materials-page .mat-folder-count { padding: 1px 8px; border-radius: 999px; background: rgba(1,5,68,.05); color: var(--navy); font-size: 12px; font-weight: 600; }
.materials-page .mat-folder-nav button[aria-selected="true"] .mat-folder-count { background: rgba(1,5,68,.08); color: var(--navy); }
.materials-page .mat-board-bar { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; }
.materials-page .mat-board-heading h3 { margin: 0; font-size: 22px; line-height: 1.4; font-weight: 600; color: var(--primary); }
.materials-page .mat-board-heading p { margin: 4px 0 0; font-size: 14px; color: var(--text-secondary); font-variant-numeric: tabular-nums; }
.materials-page .mat-board-tools { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.materials-page .mat-file-sort { color: var(--text-secondary); font-size: 14px; }
.materials-page .mat-file-sort select { min-height: 42px; }
.materials-page .mat-board-tools .mat-tp-detail-search { width: 280px; margin: 0; }
.materials-page .mat-board-tools .materials-search { height: 42px; border-color: var(--border-strong); }
.materials-page .mat-list-labels { display: grid; grid-template-columns: 40px minmax(0, 1fr) 120px 216px; gap: 16px; padding: 10px 4px; border-top: 0; border-bottom: 1px solid var(--border); color: var(--text-secondary); font-size: 13px; letter-spacing: 0; }
.materials-page .mat-list-labels span:nth-child(3) { text-align: center; }
.materials-page .mat-list-labels span:nth-child(4) { text-align: right; }
.materials-page .mat-file-list { border-bottom: 1px solid var(--border); }
.materials-page .mat-file-list .material-row { grid-template-columns: 40px minmax(0, 1fr) 120px 216px; gap: 16px; align-items: center; padding: 14px 4px; border-bottom: 0; border-top: 1px solid var(--border); }
.materials-page .mat-file-list .material-row:first-child { border-top: 0; }
.materials-page .mat-file-list .material-row:focus { outline: none; }
.materials-page .mat-file-list .material-row:focus-visible { outline: 3px solid var(--blue); outline-offset: 2px; }
.materials-page .mat-file-list .material-row-icon { align-self: center; width: 40px; height: 40px; padding: 0; border-radius: 10px; background: var(--bg-alt); color: var(--navy); display: flex; align-items: center; justify-content: center; font-size: 20px; }
.materials-page .mat-file-list .material-row-name { font-size: 16px; line-height: 1.5; font-weight: 600; color: var(--text); }
.materials-page .mat-file-list .material-row-meta { margin-top: 4px; gap: 4px 10px; font-size: 13px; color: var(--text-secondary); }
.materials-page .material-row-badge { display: flex; justify-content: center; }
.materials-page .mat-badge { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: 12.5px; line-height: 1.6; font-weight: 600; white-space: nowrap; }
.materials-page .mat-badge--public { background: rgba(0,113,184,.08); color: var(--blue); }
.materials-page .mat-badge--login { background: rgba(1,5,68,.06); color: var(--navy); }
.materials-page .mat-badge--member { background: rgba(120,56,145,.08); color: var(--purple); }
.materials-page .mat-badge--points { background: rgba(237,182,71,.22); color: #4a3306; }
.materials-page .mat-badge--unlocked { background: rgba(1,5,68,.06); color: var(--navy); }
.materials-page .mat-badge--muted { background: rgba(1,5,68,.05); color: var(--text-secondary); }
.materials-page .mat-file-list .material-row-action { max-width: none; justify-content: flex-end; flex-wrap: nowrap; gap: 8px; }
.materials-page .mat-act { display: inline-flex; align-items: center; justify-content: center; gap: 6px; width: auto; min-width: 0; height: auto; min-height: 38px; padding: 0 14px; border-radius: 8px; border: 1px solid var(--border-strong); background: #fff; color: var(--primary); font: inherit; font-size: 14px; line-height: 1.3; white-space: nowrap; cursor: pointer; transform: none; transition: background .18s ease, border-color .18s ease; }
.materials-page .mat-act i { font-size: 16px; }
.materials-page .mat-act--ghost:hover { background: var(--bg-alt); border-color: var(--primary); }
.materials-page .mat-act--primary, .materials-page .mat-act[data-action="download"] { background: var(--primary); border-color: var(--primary); color: #fff; }
.materials-page .mat-act--primary:hover { background: var(--navy); border-color: var(--navy); }
.materials-page .mat-act--off, .materials-page .mat-act:disabled { background: var(--bg-alt); border-color: var(--border); color: var(--text-secondary); cursor: not-allowed; opacity: 1; }
.materials-page .mat-show-more { display: none; }

.materials-page .mat-detail-side { position: sticky; top: 96px; display: flex; flex-direction: column; gap: 20px; }
.materials-page .mat-side-card { border: 1px solid var(--border); border-radius: 14px; padding: 20px; background: #fff; display: flex; flex-direction: column; gap: 12px; }
.materials-page .mat-side-card p { margin: 0; font-size: 14px; line-height: 1.6; color: var(--text-secondary); }
.materials-page .mat-side-label { margin: 0; font-size: 13px; font-weight: 400; color: var(--text-secondary); }
.materials-page .mat-side-title { margin: 0; font-size: 16px; font-weight: 600; color: var(--primary); }
.materials-page .mat-status-name { display: flex; align-items: center; gap: 8px; font-size: 17px; color: var(--primary); }
.materials-page .mat-status-name i { font-size: 18px; color: var(--navy); }
.materials-page .mat-status-name.is-member i { color: var(--purple); }
.materials-page .mat-status-points { display: flex; justify-content: space-between; align-items: center; font-size: 15px; color: var(--text); }
.materials-page .mat-points-pill { padding: 1px 10px; border-radius: 999px; background: var(--gold); color: #4a3306; font-size: 14px; font-weight: 600; font-variant-numeric: tabular-nums; }
.materials-page .mat-side-status .mat-status-access { font-size: 13px; }
.materials-page .mat-side-status .mat-act { align-self: flex-start; }
.materials-page .mat-side-legend { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.materials-page .mat-side-legend li { display: flex; gap: 10px; align-items: baseline; font-size: 14px; line-height: 1.6; color: var(--text-secondary); }
.materials-page .mat-side-legend .mat-badge { flex: 0 0 64px; text-align: center; }
@media (min-width: 1025px) {
    .materials-page.mat-in-detail #materialAccess { display: none; }
}
@media (max-width: 1024px) {
    .materials-page .mat-detail-layout { grid-template-columns: minmax(0, 1fr); }
    .materials-page .mat-detail-side { display: none; }
    .materials-page .mat-list-labels, .materials-page .mat-file-list .material-row { grid-template-columns: 40px minmax(0, 1fr) 110px 200px; }
}
@media (max-width: 760px) {
    .materials-page .mat-board-tools { width: 100%; }
    .materials-page .mat-board-tools .mat-tp-detail-search { flex: 1 1 200px; width: auto; }
    .materials-page .mat-list-labels { display: none; }
    .materials-page .mat-file-list .material-row { grid-template-columns: 36px minmax(0, 1fr); grid-template-areas: "icon copy" "icon badge" "action action"; gap: 6px 12px; align-items: start; padding: 14px 0; }
    .materials-page .mat-file-list .material-row-icon { grid-area: icon; width: 36px; height: 36px; border-radius: 9px; font-size: 18px; }
    .materials-page .mat-file-list .material-row-copy { grid-area: copy; }
    .materials-page .material-row-badge { grid-area: badge; justify-content: flex-start; }
    .materials-page .mat-file-list .material-row-action { grid-area: action; margin-top: 6px; }
    .materials-page .mat-file-list .material-row-action .mat-act { flex: 1; min-height: 44px; }
}
@media (max-width: 600px) {
    .materials-page .mat-course-hero-board { background-size: 300% auto; }
    .materials-page .mat-course-hero-inner { padding: 84px 20px 24px; gap: 10px; }
    .materials-page .mat-course-head { gap: 14px; }
    .materials-page .mat-course-subject { font-size: 13px; }
    .materials-page .mat-course-title { flex-direction: column; align-items: flex-start; gap: 2px; }
    .materials-page .mat-course-code { font-size: 34px; }
    .materials-page .mat-course-name { font-size: 24px; }
    .materials-page .mat-course-chips { gap: 6px; }
    .materials-page .mat-course-chips li { padding: 2px 10px; font-size: 13px; }
    .materials-page .mat-course-actions { width: 100%; gap: 8px; }
    .materials-page .mat-hero-btn { flex: 1; }
    .materials-page.mat-in-detail #materialsSection { padding-top: 18px; }
    .materials-page .mat-detail-main { gap: 14px; }
    .materials-page .mat-folder-nav { display: flex; gap: 8px; border-bottom: 0; margin: 0; }
    .materials-page .mat-folder-nav button { justify-content: center; min-height: 40px; padding: 0 14px; margin: 0; border: 1px solid var(--border-strong); border-radius: 999px; font-size: 14px; }
    .materials-page .mat-folder-nav button[aria-selected="true"] { background: var(--primary); border-color: var(--primary); color: #fff; }
    .materials-page .mat-folder-nav button .mat-folder-count, .materials-page .mat-folder-nav button[aria-selected="true"] .mat-folder-count { background: transparent; padding: 0; color: inherit; opacity: .75; font-weight: 400; }
    .materials-page .mat-folder-nav button:last-child:nth-child(odd) { grid-column: auto; }
    .materials-page .mat-board-bar { gap: 10px; }
    .materials-page .mat-board-heading h3 { font-size: 19px; }
    .materials-page .mat-board-heading p { font-size: 13px; }
    .materials-page .mat-board-tools { flex-direction: row-reverse; justify-content: flex-end; }
    .materials-page .mat-board-tools .mat-tp-detail-search { flex: 1 0 100%; }
    .materials-page .mat-file-list.is-limited .material-row:nth-child(n+7) { display: none; }
    .materials-page .mat-show-more { display: block; width: 100%; min-height: 44px; margin: 14px 0 4px; background: var(--bg-alt); border: 1px solid var(--border); border-radius: 10px; color: var(--navy); font: inherit; font-size: 14px; cursor: pointer; }
}
@media (prefers-reduced-motion: reduce) {
    .materials-page .mat-hero-btn, .materials-page .mat-act { transition: none; }
}
.materials-page .mat-file-list .material-row-meta { gap: 4px 0; }
.materials-page .mat-file-list .material-row-meta > * + *::before { content: "·"; margin: 0 8px; color: var(--text-secondary); }
.materials-page .mat-act--ghost[data-action] { background: #fff; color: var(--primary); }
.materials-page .mat-act--ghost[data-action]:hover { background: var(--bg-alt); }
@media (max-width: 600px) {
    .materials-page .mat-board-bar { display: grid; grid-template-columns: minmax(0, 1fr) auto; grid-template-areas: "search search" "head sort"; align-items: end; gap: 14px 12px; }
    .materials-page .mat-board-tools { display: contents; }
    .materials-page .mat-board-heading { grid-area: head; min-width: 0; }
    .materials-page .mat-board-tools .mat-tp-detail-search { grid-area: search; width: auto; }
    .materials-page .mat-file-sort { grid-area: sort; gap: 6px; font-size: 13px; }
    .materials-page .mat-file-sort select { min-height: 38px; flex: none; padding: 0 26px 0 10px; }
}

/* 2026-10-09 纸质资料兑换（NEW17）：资料表最右侧一列 */
.materials-page .mat-list-labels, .materials-page .mat-file-list .material-row { grid-template-columns: 40px minmax(0, 1fr) 104px 204px 128px; gap: 14px; }
.materials-page .mat-list-labels span:nth-child(5) { text-align: right; }
.materials-page .material-row-print { display: flex; justify-content: flex-end; }
.materials-page .mat-act--print { background: rgba(237,182,71,.14); border-color: rgba(237,182,71,.55); color: #4a3306; padding: 0 12px; }
.materials-page .mat-act--print:hover { background: rgba(237,182,71,.28); border-color: var(--gold); }
.materials-page .mat-act--print:disabled { background: var(--bg-alt); border-color: var(--border); color: var(--text-secondary); }
.materials-page .mat-badge--print { background: rgba(237,182,71,.14); color: #4a3306; border: 1px solid rgba(237,182,71,.55); padding: 1px 8px; }
@media (max-width: 1024px) {
    .materials-page .mat-list-labels, .materials-page .mat-file-list .material-row { grid-template-columns: 40px minmax(0, 1fr) 100px 196px 124px; gap: 12px; }
}
@media (max-width: 760px) {
    .materials-page .mat-file-list .material-row { grid-template-columns: 36px minmax(0, 1fr); grid-template-areas: "icon copy" "icon badge" "action action" "print print"; gap: 6px 12px; }
    .materials-page .material-row-print { grid-area: print; }
    .materials-page .material-row-print:empty { display: none; }
    .materials-page .material-row-print .mat-act { flex: 1; min-height: 44px; }
}