/*
 * 知序学堂 · 知识点导航
 * 正式、理性的蓝白知识导航界面。
 */

body[data-page="knowledge"] {
    --knowledge-primary: #1559b7;
    --knowledge-primary-dark: #0b3979;
    --knowledge-primary-deep: #08254f;
    --knowledge-primary-light: #2d73d2;
    --knowledge-primary-soft: #edf5ff;
    --knowledge-primary-pale: #f5f9ff;
    --knowledge-ink: #10233f;
    --knowledge-text: #263a57;
    --knowledge-muted: #708198;
    --knowledge-line: #dce6f2;
    --knowledge-line-strong: #c8d7e8;
    --knowledge-bg: #f3f7fc;
    --knowledge-surface: #ffffff;
    --knowledge-gold: #cda85a;
    --knowledge-shadow: 0 18px 50px rgba(18, 53, 94, .075), 0 2px 8px rgba(18, 53, 94, .035);
    min-width: 320px;
    color: var(--knowledge-text) !important;
    background:
        linear-gradient(rgba(30, 91, 163, .025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(30, 91, 163, .025) 1px, transparent 1px),
        var(--knowledge-bg) !important;
    background-size: 32px 32px !important;
    font-family: "HarmonyOS Sans SC", "MiSans", "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

body[data-page="knowledge"] svg {
    display: block;
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 1.8;
}

/* 顶部品牌栏 */
body[data-page="knowledge"] .header {
    position: relative;
    z-index: 20;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    height: 78px;
    padding: 0 clamp(22px, 4vw, 64px);
    border: 0 !important;
    border-bottom: 1px solid rgba(200, 215, 232, .8) !important;
    color: var(--knowledge-ink) !important;
    background: rgba(255, 255, 255, .96) !important;
    box-shadow: 0 4px 24px rgba(16, 49, 89, .045) !important;
    backdrop-filter: blur(16px);
}

body[data-page="knowledge"] .header::before {
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    height: 3px;
    content: "";
    background: linear-gradient(90deg, var(--knowledge-primary-deep), #1c66c5 72%, #5b91d6);
}

body[data-page="knowledge"] .header h1 {
    display: flex;
    align-items: center;
    gap: 11px;
    color: var(--knowledge-ink) !important;
    font-size: 17px;
    font-weight: 720;
    letter-spacing: .045em;
}

body[data-page="knowledge"] .brand-mark {
    display: inline-grid;
    width: 40px;
    height: 40px;
    flex: 0 0 40px;
    place-items: center;
    border: 1px solid rgba(255, 255, 255, .26);
    border-radius: 11px 11px 11px 4px;
    color: #fff;
    background: linear-gradient(145deg, #1c66c5, #0b3979);
    box-shadow: 0 7px 18px rgba(19, 82, 166, .2), inset 0 0 0 1px rgba(255, 255, 255, .12);
    font-family: "Songti SC", "STSong", serif;
    font-size: 21px;
    font-weight: 700;
}

body[data-page="knowledge"] .brand-copy {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

body[data-page="knowledge"] .brand-copy small {
    color: #8796aa;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: .09em;
}

body[data-page="knowledge"] .header .back-btn,
body[data-page="knowledge"] .header .logout-btn {
    display: inline-flex;
    min-height: 38px;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--knowledge-line) !important;
    border-radius: 9px !important;
    color: #536982 !important;
    background: #f8fbff !important;
    font-size: 13px;
    font-weight: 620;
}

body[data-page="knowledge"] .header .back-btn {
    width: fit-content;
    gap: 7px;
    padding: 0 13px 0 10px;
}

body[data-page="knowledge"] .header .back-btn svg {
    width: 17px;
    height: 17px;
}

body[data-page="knowledge"] .header .logout-btn { padding: 0 14px; }

body[data-page="knowledge"] .header .back-btn:hover,
body[data-page="knowledge"] .header .logout-btn:hover {
    border-color: #b8cde6 !important;
    color: var(--knowledge-primary) !important;
    background: var(--knowledge-primary-soft) !important;
}

body[data-page="knowledge"] .header .user-info {
    justify-self: end;
    gap: 11px;
    color: var(--knowledge-muted);
    font-size: 13px;
}

body[data-page="knowledge"] .header .user-info::before {
    display: inline-grid;
    width: 31px;
    height: 31px;
    place-items: center;
    border: 1px solid #d8e5f4;
    border-radius: 50%;
    color: var(--knowledge-primary);
    content: "学";
    background: var(--knowledge-primary-soft);
    font-family: "Songti SC", serif;
    font-size: 13px;
    font-weight: 700;
}

body[data-page="knowledge"] #studentName {
    color: #243a56;
    font-size: 14px;
    font-weight: 680;
}

body[data-page="knowledge"] #studentNoDisplay {
    padding-left: 11px;
    border-left: 1px solid var(--knowledge-line);
}

/* 页面题头与检索 */
body[data-page="knowledge"] .container {
    width: min(100%, 1500px);
    max-width: none;
    margin: 0 auto;
    padding: 34px clamp(18px, 4vw, 60px) 60px;
}

body[data-page="knowledge"] .page-intro {
    position: relative;
    display: flex;
    min-height: 210px;
    align-items: flex-start;
    justify-content: space-between;
    gap: 40px;
    margin: 0;
    padding: 42px 48px 72px;
    overflow: hidden;
    border: 1px solid rgba(108, 156, 216, .22);
    border-radius: 26px;
    color: #fff;
    background:
        radial-gradient(circle at 82% 22%, rgba(72, 138, 224, .38), transparent 21rem),
        linear-gradient(125deg, #071e43 0%, #0a326a 55%, #0e4d98 100%);
    box-shadow: 0 22px 54px rgba(13, 50, 104, .16);
}

body[data-page="knowledge"] .page-intro::before {
    position: absolute;
    top: -88px;
    right: -58px;
    width: 320px;
    height: 320px;
    border: 1px solid rgba(255, 255, 255, .105);
    border-radius: 50%;
    content: "";
    box-shadow: 0 0 0 44px rgba(255, 255, 255, .025), 0 0 0 88px rgba(255, 255, 255, .018);
}

body[data-page="knowledge"] .page-intro::after {
    position: absolute;
    right: 48px;
    bottom: 32px;
    width: 210px;
    height: 1px;
    content: "";
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .28));
}

body[data-page="knowledge"] .page-intro > * { position: relative; z-index: 1; }

body[data-page="knowledge"] .page-eyebrow {
    display: block;
    margin-bottom: 13px;
    color: #a9cffc;
    font-family: Inter, Arial, sans-serif;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .17em;
}

body[data-page="knowledge"] .page-intro h2 {
    margin: 0;
    color: #fff;
    font-family: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
    font-size: clamp(32px, 3.4vw, 44px);
    font-weight: 650;
    letter-spacing: .045em;
    line-height: 1.2;
}

body[data-page="knowledge"] .page-intro p {
    margin: 13px 0 0;
    color: #c7daf2;
    font-size: 16px;
    line-height: 1.75;
}

body[data-page="knowledge"] .page-intro-signature {
    display: flex;
    align-items: center;
    gap: 13px;
    margin: 31px 8px 0 0;
    color: rgba(230, 240, 253, .8);
    font-family: "Songti SC", "STSong", serif;
    font-size: 16px;
    letter-spacing: .16em;
    white-space: nowrap;
}

body[data-page="knowledge"] .page-intro-signature i {
    width: 30px;
    height: 1px;
    background: var(--knowledge-gold);
}

body[data-page="knowledge"] .search-bar {
    position: relative;
    z-index: 4;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    min-height: 76px;
    align-items: center;
    gap: 12px;
    margin: -36px 32px 26px;
    padding: 11px;
    padding-left: 57px;
    border: 1px solid #dce6f2 !important;
    border-radius: 16px !important;
    background: rgba(255, 255, 255, .98) !important;
    box-shadow: 0 18px 42px rgba(15, 54, 103, .13), 0 2px 6px rgba(15, 54, 103, .04) !important;
}

body[data-page="knowledge"] .search-icon {
    position: absolute;
    left: 27px;
    color: #6a829f;
    pointer-events: none;
}

body[data-page="knowledge"] .search-icon svg { width: 20px; height: 20px; }

body[data-page="knowledge"] .search-bar #searchInput {
    width: 100%;
    min-width: 0;
    min-height: 52px;
    padding: 0 14px 0 0;
    border: 0 !important;
    border-radius: 0 !important;
    color: var(--knowledge-ink) !important;
    background: transparent !important;
    font-size: 16px;
    box-shadow: none !important;
}

body[data-page="knowledge"] .search-bar #searchInput::placeholder { color: #98a7ba; }

body[data-page="knowledge"] .search-bar #searchInput:focus {
    border: 0 !important;
    outline: 0;
    box-shadow: none !important;
}

body[data-page="knowledge"] .search-bar:focus-within {
    border-color: #9ebde2 !important;
    box-shadow: 0 0 0 4px rgba(33, 103, 190, .08), 0 18px 42px rgba(15, 54, 103, .13) !important;
}

body[data-page="knowledge"] .search-bar button {
    display: inline-flex;
    min-height: 50px;
    align-items: center;
    justify-content: center;
    gap: 18px;
    padding: 0 18px 0 22px;
    border: 1px solid var(--knowledge-primary) !important;
    border-radius: 10px !important;
    color: #fff;
    background: linear-gradient(135deg, var(--knowledge-primary-light), var(--knowledge-primary)) !important;
    box-shadow: 0 8px 20px rgba(21, 89, 183, .2) !important;
    font-size: 15px;
    font-weight: 680;
}

body[data-page="knowledge"] .search-bar button svg { width: 17px; height: 17px; }

body[data-page="knowledge"] .search-bar button:hover {
    border-color: var(--knowledge-primary-dark) !important;
    background: linear-gradient(135deg, var(--knowledge-primary), var(--knowledge-primary-dark)) !important;
}

/* 主内容布局 */
body[data-page="knowledge"] .main-layout {
    display: grid;
    grid-template-columns: 350px minmax(0, 1fr);
    align-items: start;
    gap: 24px;
}

body[data-page="knowledge"] .nav-tree,
body[data-page="knowledge"] .content-area {
    border: 1px solid var(--knowledge-line) !important;
    border-radius: 20px !important;
    background: rgba(255, 255, 255, .98) !important;
    box-shadow: var(--knowledge-shadow) !important;
}

/* 完整展开的学科目录 */
body[data-page="knowledge"] .nav-tree {
    position: sticky;
    top: 20px;
    width: 350px;
    max-height: calc(100vh - 40px);
    padding: 22px 13px 18px;
    overflow-y: auto;
    scrollbar-color: #c1d2e5 transparent;
    scrollbar-width: thin;
}

body[data-page="knowledge"] .panel-heading {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 16px;
    margin: 0 9px 18px;
    padding: 0 3px 17px;
    border-bottom: 1px solid var(--knowledge-line);
}

body[data-page="knowledge"] .panel-kicker {
    display: block;
    margin-bottom: 5px;
    color: #899bb1;
    font-family: Inter, Arial, sans-serif;
    font-size: 10px;
    font-weight: 720;
    letter-spacing: .13em;
}

body[data-page="knowledge"] .nav-tree h3 {
    margin: 0;
    padding: 0;
    border: 0;
    color: var(--knowledge-ink) !important;
    font-size: 20px;
    font-weight: 720;
}

body[data-page="knowledge"] .catalog-state {
    display: inline-flex;
    min-height: 29px;
    align-items: center;
    gap: 6px;
    padding: 0 8px;
    border: 1px solid #d8e7f8;
    border-radius: 99px;
    color: #50749f;
    background: #f3f8fe;
    font-size: 12px;
    white-space: nowrap;
}

body[data-page="knowledge"] .catalog-state i {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: #3781d7;
    box-shadow: 0 0 0 3px rgba(55, 129, 215, .12);
}

body[data-page="knowledge"] #treeContainer { padding: 0 2px; }
body[data-page="knowledge"] .tree-node { min-width: 0; }

body[data-page="knowledge"] .subject-node {
    margin: 0 0 12px;
    padding: 0 0 11px;
    border-bottom: 1px solid #e8eff7;
}

body[data-page="knowledge"] .subject-node:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: 0;
}

body[data-page="knowledge"] .tree-node .tree-node { margin-left: 0; }

body[data-page="knowledge"] .node-children,
body[data-page="knowledge"] .node-children.expanded {
    display: block !important;
}

body[data-page="knowledge"] .node-content {
    position: relative;
    display: flex;
    min-width: 0;
    align-items: center;
    margin: 0;
    cursor: default;
    transition: color .16s ease, background-color .16s ease, border-color .16s ease, box-shadow .16s ease;
}

body[data-page="knowledge"] .subject-content {
    min-height: 54px;
    gap: 10px;
    padding: 7px 8px;
    border: 1px solid transparent;
    border-radius: 12px;
    color: #17395f;
}

body[data-page="knowledge"] .subject-content:hover,
body[data-page="knowledge"] .subject-content.focused {
    border-color: #d6e4f4;
    background: #f5f9fe;
}

body[data-page="knowledge"] .node-number {
    display: inline-grid;
    width: 36px;
    height: 36px;
    flex: 0 0 36px;
    place-items: center;
    border-radius: 8px 8px 8px 3px;
    color: #fff;
    background: linear-gradient(145deg, #3478ca, #124b95);
    box-shadow: 0 5px 12px rgba(19, 78, 150, .16);
    font-family: Inter, Arial, sans-serif;
    font-size: 12px;
    font-weight: 740;
    letter-spacing: .04em;
}

body[data-page="knowledge"] .subject-content > .node-name {
    color: #17395f;
    font-size: 17px;
    font-weight: 720;
    letter-spacing: .025em;
}

body[data-page="knowledge"] .grade-node {
    position: relative;
    margin: 4px 0 7px 19px !important;
    padding-left: 17px;
    border-left: 1px solid #dce7f3;
}

body[data-page="knowledge"] .grade-content {
    min-height: 40px;
    gap: 8px;
    padding: 5px 6px 5px 1px;
    color: #506884;
}

body[data-page="knowledge"] .grade-content::before {
    position: absolute;
    top: 50%;
    left: -18px;
    width: 14px;
    height: 1px;
    content: "";
    background: #dce7f3;
}

body[data-page="knowledge"] .grade-content:hover,
body[data-page="knowledge"] .grade-content.focused { color: var(--knowledge-primary); }

body[data-page="knowledge"] .node-grade-line {
    width: 17px;
    height: 4px;
    flex: 0 0 17px;
    border-radius: 99px;
    background: #83a8d2;
}

body[data-page="knowledge"] .grade-content > .node-name {
    font-size: 15px;
    font-weight: 700;
}

body[data-page="knowledge"] .unit-node { margin: 2px 0; }

body[data-page="knowledge"] .unit-content {
    min-height: 48px;
    gap: 9px;
    padding: 6px 7px 6px 9px;
    border: 1px solid transparent;
    border-radius: 10px;
    color: #546b85;
    cursor: pointer;
}

body[data-page="knowledge"] .unit-content:hover {
    border-color: #dbe8f6;
    color: #174f93;
    background: #f6faff;
}

body[data-page="knowledge"] .unit-content.active {
    border-color: #bcd3ef;
    color: #0d4b99;
    background: #eaf3ff;
    box-shadow: inset 3px 0 0 #246cc2;
}

body[data-page="knowledge"] .node-unit-mark {
    width: 8px;
    height: 8px;
    flex: 0 0 8px;
    border: 1px solid #7098c5;
    border-radius: 2px;
    background: #fff;
    transform: rotate(45deg);
}

body[data-page="knowledge"] .unit-content.active .node-unit-mark {
    border-color: #2367b7;
    background: #2367b7;
    box-shadow: 0 0 0 3px rgba(35, 103, 183, .1);
}

body[data-page="knowledge"] .node-name {
    min-width: 0;
    flex: 1;
    overflow: hidden;
    font-size: 15px;
    font-weight: 620;
    line-height: 1.45;
    text-overflow: ellipsis;
    white-space: nowrap;
}

body[data-page="knowledge"] .node-view {
    color: #8094aa;
    font-size: 12px;
    opacity: 0;
    transform: translateX(3px);
    transition: opacity .16s ease, transform .16s ease;
}

body[data-page="knowledge"] .unit-content:hover .node-view,
body[data-page="knowledge"] .unit-content.active .node-view {
    opacity: 1;
    transform: none;
}

body[data-page="knowledge"] .node-external {
    display: inline-grid;
    width: 27px;
    height: 27px;
    flex: 0 0 27px;
    place-items: center;
    border: 1px solid transparent;
    border-radius: 6px;
    color: #8ba0b7 !important;
    font-family: Arial, sans-serif;
    font-size: 14px;
    text-decoration: none;
}

body[data-page="knowledge"] .node-external:hover {
    border-color: #cbdcf0;
    color: var(--knowledge-primary) !important;
    background: #fff;
}

/* 知识点内容区 */
body[data-page="knowledge"] .content-area {
    width: 100%;
    min-width: 0;
    min-height: 600px;
    max-height: none;
    padding: clamp(26px, 3vw, 38px);
    overflow: visible;
}

body[data-page="knowledge"] .kp-header {
    align-items: flex-start;
    min-height: 64px;
    margin-bottom: 22px;
    padding: 0 0 20px;
    border-bottom: 1px solid var(--knowledge-line);
}

body[data-page="knowledge"] .kp-header::after {
    align-self: center;
    padding: 6px 10px;
    border: 1px solid #dce8f6;
    border-radius: 99px;
    color: #6280a1;
    content: "学习进度";
    background: #f6faff;
    font-size: 10px;
}

body[data-page="knowledge"] .kp-header h3 {
    color: var(--knowledge-ink) !important;
    font-family: "Songti SC", "STSong", serif;
    font-size: 30px;
    font-weight: 650;
    letter-spacing: .035em;
}

body[data-page="knowledge"] .kp-header .breadcrumb {
    margin-top: 6px;
    color: var(--knowledge-muted);
    font-size: 14px;
}

body[data-page="knowledge"] .legend {
    display: flex;
    gap: 8px;
    margin-bottom: 23px;
    padding: 0;
    background: transparent;
}

body[data-page="knowledge"] .legend-item {
    min-height: 38px;
    gap: 7px;
    padding: 0 14px;
    border: 1px solid #e0e8f1;
    border-radius: 999px;
    color: #64768c;
    background: #f9fbfe;
    font-size: 13px;
    font-weight: 650;
}

body[data-page="knowledge"] .legend-dot {
    width: 9px;
    height: 9px;
    box-shadow: 0 0 0 3px rgba(95, 126, 161, .08);
}

body[data-page="knowledge"] .legend-dot.review { background: #d9973f; }
body[data-page="knowledge"] .legend-dot.unfamiliar { background: #6e88a8; }
body[data-page="knowledge"] .legend-dot.learning { background: #3278c7; }
body[data-page="knowledge"] .legend-dot.mastered { background: #2e9972; }

body[data-page="knowledge"] .kp-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 18px;
}

body[data-page="knowledge"] .kp-card {
    position: relative;
    min-height: 184px;
    padding: 22px;
    overflow: hidden;
    border: 1px solid #dfe8f2;
    border-radius: 17px;
    background: linear-gradient(145deg, #fff 0%, #fbfdff 100%);
    box-shadow: 0 6px 18px rgba(27, 61, 101, .045);
    transition: border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}

body[data-page="knowledge"] .kp-card::before {
    position: absolute;
    top: 18px;
    left: 22px;
    display: inline-flex;
    width: auto;
    height: 26px;
    align-items: center;
    padding: 0 9px;
    border: 1px solid #c9ddf4;
    border-radius: 7px;
    color: #2467b4;
    content: "知识要点";
    background: #edf5ff;
    font-size: 11px;
    font-weight: 720;
    letter-spacing: .04em;
}

body[data-page="knowledge"] .kp-card::after {
    position: absolute;
    top: 18px;
    right: 20px;
    display: grid;
    width: 25px;
    height: 25px;
    place-items: center;
    border: 1px solid #dce7f3;
    border-radius: 7px;
    color: #8da0b5;
    content: "↗";
    background: #f8fbff;
    font-family: Arial, sans-serif;
    font-size: 11px;
    transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

body[data-page="knowledge"] .kp-card:hover {
    border-color: #a9c8ea;
    box-shadow: 0 16px 32px rgba(21, 75, 137, .11);
    transform: translateY(-3px) !important;
}

body[data-page="knowledge"] .kp-card:hover::after {
    border-color: #b9d1ed;
    color: var(--knowledge-primary);
    background: var(--knowledge-primary-soft);
}

body[data-page="knowledge"] .kp-card .kp-content {
    min-height: 58px;
    margin: 39px 30px 20px 0;
    color: #122f52;
    font-size: 18px;
    font-weight: 740;
    line-height: 1.55;
}

body[data-page="knowledge"] .kp-card .kp-stats { gap: 10px; }

body[data-page="knowledge"] .kp-status,
body[data-page="knowledge"] .kp-card .kp-status {
    display: inline-flex;
    min-height: 31px;
    align-items: center;
    padding: 0 11px;
    border: 1px solid #e0e7ef;
    border-radius: 999px;
    color: #65768a;
    background: #f7f9fc;
    font-size: 12px;
    font-weight: 720;
}

body[data-page="knowledge"] .kp-status::before {
    width: 6px;
    height: 6px;
    margin-right: 6px;
    border-radius: 50%;
    content: "";
    background: currentColor;
    box-shadow: 0 0 0 3px rgba(78, 108, 143, .08);
}

body[data-page="knowledge"] .kp-status.review { color: #9a651e; border-color: #efd9b8; background: #fff8ec; }
body[data-page="knowledge"] .kp-status.unfamiliar { color: #5a708a; border-color: #d7e1eb; background: #f0f4f8; }
body[data-page="knowledge"] .kp-status.learning { color: #195fae; border-color: #c8ddf4; background: #ebf4ff; }
body[data-page="knowledge"] .kp-status.mastered { color: #247958; border-color: #c9e4d9; background: #ebf8f2; }

body[data-page="knowledge"] .kp-card .kp-score {
    color: #153f71;
    font-family: Inter, Arial, sans-serif;
    font-size: 21px;
    font-weight: 760;
}

body[data-page="knowledge"] .progress-bar {
    height: 6px;
    margin-top: 16px !important;
    border-radius: 99px;
    background: #eaf0f6;
}

body[data-page="knowledge"] .progress-bar .fill { border-radius: 99px; }
body[data-page="knowledge"] .progress-bar .fill.review { background: #d9973f; }
body[data-page="knowledge"] .progress-bar .fill.unfamiliar { background: #6e88a8; }
body[data-page="knowledge"] .progress-bar .fill.learning { background: #3278c7; }
body[data-page="knowledge"] .progress-bar .fill.mastered { background: #2e9972; }

body[data-page="knowledge"] .empty-state {
    display: flex;
    min-height: 500px;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    padding: 60px 20px;
    color: var(--knowledge-muted);
    text-align: center;
}

body[data-page="knowledge"] .empty-state .icon {
    position: relative;
    display: grid;
    width: 82px;
    height: 82px;
    margin-bottom: 20px;
    place-items: center;
    border: 1px solid #d4e3f4;
    border-radius: 23px;
    color: #477bb5;
    background: linear-gradient(145deg, #f6faff, #e8f2fe);
    box-shadow: 0 10px 24px rgba(32, 91, 158, .08);
    font-size: 28px;
}

body[data-page="knowledge"] .empty-state .icon::after {
    position: absolute;
    right: -7px;
    bottom: -7px;
    width: 18px;
    height: 18px;
    border: 4px solid #fff;
    border-radius: 50%;
    content: "";
    background: var(--knowledge-gold);
}

body[data-page="knowledge"] .empty-state .icon svg {
    width: 51px;
    height: 51px;
    stroke-width: 1.3;
}

body[data-page="knowledge"] .empty-state h4 {
    margin: 0 0 8px;
    color: #243c5a;
    font-size: 20px;
    font-weight: 700;
}

body[data-page="knowledge"] .empty-state p {
    max-width: 390px;
    margin: 0;
    font-size: 15px;
    line-height: 1.75;
}

body[data-page="knowledge"] .nav-tree .empty-state {
    min-height: 180px;
    padding: 28px 10px;
}

body[data-page="knowledge"] .loading {
    padding: 54px 20px;
    color: var(--knowledge-muted);
    font-size: 12px;
}

body[data-page="knowledge"] .loading-spinner {
    width: 34px;
    height: 34px;
    border: 3px solid #dce7f3;
    border-top-color: var(--knowledge-primary);
}

/* 详情弹窗 */
body[data-page="knowledge"] .modal-overlay {
    padding: 20px;
    background: rgba(5, 24, 51, .56) !important;
    backdrop-filter: blur(7px);
}

body[data-page="knowledge"] .modal {
    max-width: 580px;
    padding: 29px;
    border: 1px solid rgba(205, 221, 239, .95) !important;
    border-radius: 20px !important;
    background: var(--knowledge-surface) !important;
    box-shadow: 0 30px 80px rgba(4, 26, 57, .27) !important;
}

body[data-page="knowledge"] .modal-header {
    margin-bottom: 22px;
    padding-bottom: 18px;
    border-bottom-color: var(--knowledge-line) !important;
}

body[data-page="knowledge"] .modal-header > div > span {
    display: block;
    margin-bottom: 4px;
    color: #889bb1;
    font-family: Inter, Arial, sans-serif;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: .15em;
}

body[data-page="knowledge"] .modal-header h3 {
    color: var(--knowledge-ink) !important;
    font-size: 23px;
    font-weight: 720;
}

body[data-page="knowledge"] .modal-close {
    display: inline-grid;
    width: 35px;
    height: 35px;
    place-items: center;
    border: 1px solid var(--knowledge-line) !important;
    border-radius: 9px !important;
    color: #73869d !important;
    background: #f7faff !important;
    font-size: 20px;
}

body[data-page="knowledge"] .modal-close:hover {
    color: var(--knowledge-primary) !important;
    background: var(--knowledge-primary-soft) !important;
}

body[data-page="knowledge"] .kp-detail {
    margin-bottom: 24px;
    padding: 2px 18px;
    border: 1px solid #dee8f2;
    border-radius: 14px;
    background: #f9fbfe;
}

body[data-page="knowledge"] .kp-detail .row {
    align-items: center;
    min-height: 50px;
    margin: 0;
    padding: 9px 0;
    border-bottom: 1px solid #e3ebf4;
}

body[data-page="knowledge"] .kp-detail .row:last-child { border-bottom: 0; }
body[data-page="knowledge"] .kp-detail .label { width: 100px; flex: 0 0 100px; color: #667b94; font-size: 14px; }
body[data-page="knowledge"] .kp-detail .value { min-width: 0; color: #203b5d; font-size: 15px; line-height: 1.55; }
body[data-page="knowledge"] .kp-detail .row:first-child .value { font-size: 18px !important; font-weight: 720 !important; }
body[data-page="knowledge"] .kp-detail .value[style*="667eea"] { color: var(--knowledge-primary) !important; }

body[data-page="knowledge"] .kp-actions { justify-content: flex-end; gap: 9px; }
body[data-page="knowledge"] .kp-actions button { min-height: 46px; padding: 0 21px; border-radius: 9px !important; font-size: 15px; font-weight: 680; }
body[data-page="knowledge"] .btn-start { border-color: var(--knowledge-primary) !important; background: linear-gradient(135deg, var(--knowledge-primary-light), var(--knowledge-primary)) !important; box-shadow: 0 8px 18px rgba(21, 89, 183, .18) !important; }
body[data-page="knowledge"] .btn-start:hover { border-color: var(--knowledge-primary-dark) !important; background: var(--knowledge-primary-dark) !important; }
body[data-page="knowledge"] .btn-cancel { color: #5f7186 !important; border-color: var(--knowledge-line) !important; background: #f8faff !important; }
body[data-page="knowledge"] .btn-cancel:hover { color: var(--knowledge-ink) !important; background: #eef4fa !important; }

@media (max-width: 1040px) {
    body[data-page="knowledge"] .main-layout { grid-template-columns: 300px minmax(0, 1fr); gap: 18px; }
    body[data-page="knowledge"] .nav-tree { width: 300px; }
    body[data-page="knowledge"] .page-intro { padding-right: 38px; padding-left: 38px; }
    body[data-page="knowledge"] .kp-grid { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
    body[data-page="knowledge"] .header {
        grid-template-columns: auto 1fr auto;
        min-height: 66px;
        height: 66px;
        padding: 0 12px;
        gap: 8px;
    }

    body[data-page="knowledge"] .header h1 { justify-self: center; gap: 7px; font-size: 14px; }
    body[data-page="knowledge"] .brand-mark { width: 33px; height: 33px; flex-basis: 33px; border-radius: 9px 9px 9px 4px; font-size: 17px; }
    body[data-page="knowledge"] .brand-copy small { display: none; }
    body[data-page="knowledge"] .header .back-btn { width: 37px; min-height: 35px; padding: 0; }
    body[data-page="knowledge"] .header .back-btn span { display: none; }
    body[data-page="knowledge"] .header .logout-btn { min-height: 35px; padding: 0 10px; font-size: 11px; }
    body[data-page="knowledge"] .header .user-info { gap: 0; }
    body[data-page="knowledge"] .header .user-info::before,
    body[data-page="knowledge"] #studentName,
    body[data-page="knowledge"] #studentNoDisplay { display: none; }

    body[data-page="knowledge"] .container { padding: 20px 12px 38px; }
    body[data-page="knowledge"] .page-intro {
        min-height: 190px;
        padding: 29px 24px 59px;
        border-radius: 20px;
    }
    body[data-page="knowledge"] .page-eyebrow { margin-bottom: 9px; font-size: 10px; letter-spacing: .1em; }
    body[data-page="knowledge"] .page-intro h2 { font-size: 31px; }
    body[data-page="knowledge"] .page-intro p { max-width: 295px; margin-top: 10px; font-size: 14px; }
    body[data-page="knowledge"] .page-intro-signature { display: none; }

    body[data-page="knowledge"] .search-bar {
        grid-template-columns: minmax(0, 1fr) 62px;
        min-height: 64px;
        gap: 7px;
        margin: -30px 12px 18px;
        padding: 8px;
        padding-left: 44px;
        border-radius: 14px !important;
    }

    body[data-page="knowledge"] .search-icon { left: 17px; }
    body[data-page="knowledge"] .search-icon svg { width: 18px; height: 18px; }
    body[data-page="knowledge"] .search-bar #searchInput { min-height: 46px; padding-right: 3px; font-size: 14px; }
    body[data-page="knowledge"] .search-bar button { min-height: 46px; gap: 0; padding: 0 10px; }
    body[data-page="knowledge"] .search-bar button span { display: none; }

    body[data-page="knowledge"] .main-layout { display: flex; flex-direction: column; gap: 15px; }
    body[data-page="knowledge"] .nav-tree,
    body[data-page="knowledge"] .content-area { width: 100%; border-radius: 16px !important; }
    body[data-page="knowledge"] .nav-tree { position: static; max-height: none; padding: 18px 10px 15px; }
    body[data-page="knowledge"] .panel-heading { margin-bottom: 13px; padding-bottom: 14px; }
    body[data-page="knowledge"] .content-area { min-height: 380px; padding: 21px 15px; }
    body[data-page="knowledge"] .kp-header { min-height: 54px; margin-bottom: 17px; padding-bottom: 16px; }
    body[data-page="knowledge"] .kp-header h3 { font-size: 26px; }
    body[data-page="knowledge"] .kp-header::after { display: none; }
    body[data-page="knowledge"] .legend { flex-wrap: nowrap; margin: 0 -3px 18px; padding: 0 3px 4px; overflow-x: auto; scrollbar-width: none; }
    body[data-page="knowledge"] .legend::-webkit-scrollbar { display: none; }
    body[data-page="knowledge"] .legend-item { flex: 0 0 auto; }
    body[data-page="knowledge"] .kp-grid { grid-template-columns: 1fr; gap: 11px; }
    body[data-page="knowledge"] .kp-card { min-height: 178px; padding: 20px; }
    body[data-page="knowledge"] .empty-state { min-height: 330px; padding: 42px 14px; }

    body[data-page="knowledge"] .modal-overlay { padding: 10px; }
    body[data-page="knowledge"] .modal { padding: 22px 17px; border-radius: 17px !important; }
    body[data-page="knowledge"] .kp-detail { padding: 2px 13px; }
    body[data-page="knowledge"] .kp-detail .label { width: 79px; flex-basis: 79px; }
}

@media (max-width: 380px) {
    body[data-page="knowledge"] .brand-copy { display: none; }
    body[data-page="knowledge"] .page-intro { padding-right: 20px; padding-left: 20px; }
    body[data-page="knowledge"] .page-intro p { max-width: 265px; }
}

@media (prefers-reduced-motion: reduce) {
    body[data-page="knowledge"] *,
    body[data-page="knowledge"] *::before,
    body[data-page="knowledge"] *::after {
        transition-duration: .01ms !important;
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
    }
}