/* 题库中心 — 高端大气版，对齐 home 视觉语言 */
:root {
    --tiku-bg: #f3f5f9;
    --tiku-surface: #ffffff;
    --tiku-text: #12151a;
    --tiku-text-2: #5b616b;
    --tiku-text-3: #8a919c;
    --tiku-line: #e8ebf0;
    --tiku-primary: #1677ff;
    --tiku-primary-soft: #e8f3ff;
    --tiku-primary-hover: #0f66e0;
    --tiku-ink: #071a3a;
    --tiku-radius: 18px;
    --tiku-shadow: 0 1px 2px rgba(18, 21, 26, 0.04), 0 18px 40px rgba(18, 21, 26, 0.06);
    --tiku-ease: cubic-bezier(0.22, 1, 0.36, 1);
}

body:has(.tiku-wrap),
body:has(.tiku-page) {
    background: var(--tiku-bg);
}

.tiku-wrap {
    min-height: calc(100vh - 120px);
    padding-bottom: 72px;
    background:
        radial-gradient(1200px 320px at 8% -80px, rgba(22, 119, 255, 0.12), transparent 55%),
        radial-gradient(900px 260px at 100% 0, rgba(7, 26, 58, 0.06), transparent 50%),
        var(--tiku-bg);
}

.tiku-page {
    max-width: 1250px;
    margin: 0 auto;
    padding: 28px 16px 0;
    color: var(--tiku-text);
}

/* —— Hero —— */
.tiku-hero {
    position: relative;
    overflow: hidden;
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(180px, 0.65fr);
    align-items: end;
    gap: 24px;
    margin-bottom: 36px;
    min-height: 320px;
    padding: 52px 48px 48px;
    border-radius: 24px;
    color: #fff;
    background: var(--tiku-ink);
    box-shadow: 0 28px 60px rgba(7, 26, 58, 0.28);
    animation: tiku-rise 0.7s var(--tiku-ease) both;
}

.tiku-hero-media {
    position: absolute;
    inset: 0;
    background: url("/assets/img/tiku-banner.svg") center right / cover no-repeat;
    transform: scale(1.04);
    pointer-events: none;
    animation: tiku-drift 20s ease-in-out infinite alternate;
}

.tiku-hero-shade {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(112deg, rgba(4, 12, 30, 0.96) 0%, rgba(6, 20, 48, 0.82) 42%, rgba(8, 30, 70, 0.28) 72%, rgba(8, 30, 70, 0.12) 100%),
        linear-gradient(0deg, rgba(4, 12, 30, 0.28), transparent 40%);
    pointer-events: none;
}

.tiku-hero-copy,
.tiku-hero-stat {
    position: relative;
    z-index: 1;
}

.tiku-eyebrow {
    margin: 0 0 14px;
    font-size: 12px;
    font-weight: 450;
    letter-spacing: 0.22em;
    color: rgba(255, 255, 255, 0.55);
}

.tiku-title {
    margin: 0 0 14px;
    font-size: 52px;
    font-weight: 750;
    letter-spacing: -0.04em;
    line-height: 1.08;
    color: #fff;
}

.tiku-desc {
    margin: 0;
    max-width: 460px;
    font-size: 17px;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.78);
}

.tiku-search {
    display: flex;
    max-width: 460px;
    margin-top: 28px;
    padding: 6px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 16px;
    backdrop-filter: blur(10px);
}

.tiku-search input {
    flex: 1;
    border: 0;
    height: 44px;
    padding: 0 14px;
    outline: none;
    font-size: 15px;
    color: #fff;
    background: transparent;
}

.tiku-search input::placeholder {
    color: rgba(255, 255, 255, 0.45);
}

.tiku-search button {
    border: 0;
    min-width: 92px;
    height: 44px;
    border-radius: 12px;
    background: #fff;
    color: var(--tiku-ink);
    cursor: pointer;
    font-size: 14px;
    font-weight: 450;
    transition: transform 0.2s var(--tiku-ease), background 0.2s ease;
}

.tiku-search button:hover {
    background: #e8f3ff;
    transform: translateY(-1px);
}

.tiku-hero-stat {
    justify-self: end;
    text-align: right;
    padding-bottom: 8px;
}

.tiku-hero-stat strong {
    display: block;
    font-size: 64px;
    font-weight: 750;
    letter-spacing: -0.05em;
    line-height: 1;
    color: #fff;
    text-shadow: 0 10px 40px rgba(0, 0, 0, 0.25);
}

.tiku-hero-stat span {
    display: inline-block;
    margin-top: 10px;
    font-size: 13px;
    font-weight: 400;
    letter-spacing: 0.08em;
    color: rgba(255, 255, 255, 0.55);
}

/* —— Sections —— */
.tiku-block {
    margin-bottom: 40px;
    animation: tiku-rise 0.7s var(--tiku-ease) both;
    animation-delay: 0.08s;
}

.tiku-block:nth-of-type(2) { animation-delay: 0.14s; }
.tiku-block:nth-of-type(3) { animation-delay: 0.2s; }

.tiku-block-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
}

.tiku-block-title {
    margin: 0 0 6px;
    font-size: 26px;
    font-weight: 750;
    letter-spacing: -0.03em;
    color: var(--tiku-text);
}

.tiku-block-desc {
    margin: 0;
    font-size: 14px;
    color: var(--tiku-text-3);
}

.tiku-block-link {
    color: var(--tiku-primary) !important;
    text-decoration: none !important;
    font-size: 14px;
    font-weight: 450;
    white-space: nowrap;
}

/* —— Category grid（简洁） —— */
.tiku-cats {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 1px;
    background: var(--tiku-line);
    border: 1px solid var(--tiku-line);
    border-radius: 18px;
    overflow: hidden;
    box-shadow: var(--tiku-shadow);
}

.tiku-cat {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 18px;
    min-height: 108px;
    padding: 20px 18px;
    background: var(--tiku-surface);
    text-decoration: none !important;
    color: inherit;
    transition: background 0.2s ease, color 0.2s ease;
}

.tiku-cat strong {
    font-size: 15px;
    font-weight: 450;
    letter-spacing: -0.02em;
    line-height: 1.35;
    color: var(--tiku-text);
}

.tiku-cat span {
    font-size: 22px;
    font-weight: 750;
    letter-spacing: -0.03em;
    line-height: 1;
    color: var(--tiku-text-3);
    font-variant-numeric: tabular-nums;
}

.tiku-cat span::after {
    content: " 题";
    margin-left: 2px;
    font-size: 12px;
    font-weight: 400;
    letter-spacing: 0;
    color: #b6bcc6;
}

.tiku-cat:hover {
    background: #f7faff;
}

.tiku-cat:hover strong {
    color: var(--tiku-primary);
}

.tiku-cat:hover span {
    color: var(--tiku-primary);
}

/* —— Spotlight latest —— */
.tiku-spotlight {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.tiku-spot {
    background: var(--tiku-surface);
    border: 1px solid var(--tiku-line);
    border-radius: 20px;
    box-shadow: var(--tiku-shadow);
    padding: 22px 24px 18px;
}

.tiku-spot-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--tiku-line);
}

.tiku-spot-head h3 {
    margin: 0;
    font-size: 16px;
    font-weight: 750;
    letter-spacing: -0.02em;
}

.tiku-spot-head a {
    color: var(--tiku-primary) !important;
    text-decoration: none !important;
    font-size: 13px;
    font-weight: 450;
    white-space: nowrap;
}

.tiku-spot-list {
    list-style: none;
    margin: 0;
    padding: 0;
    counter-reset: spot;
}

.tiku-spot-list li {
    counter-increment: spot;
    display: grid;
    grid-template-columns: 28px minmax(0, 1fr);
    gap: 8px;
    align-items: start;
    padding: 10px 0;
    border-bottom: 1px solid #f1f3f6;
}

.tiku-spot-list li:last-child {
    border-bottom: 0;
}

.tiku-spot-list li::before {
    content: counter(spot, decimal-leading-zero);
    font-size: 12px;
    font-weight: 450;
    color: #c0c7d2;
    line-height: 1.6;
}

.tiku-spot-list a {
    color: var(--tiku-text) !important;
    text-decoration: none !important;
    font-size: 14px;
    line-height: 1.55;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.tiku-spot-list a:hover {
    color: var(--tiku-primary) !important;
}

/* —— Papers —— */
.tiku-paper-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.tiku-paper-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    min-height: 72px;
    padding: 18px 22px;
    border-radius: 16px;
    background: linear-gradient(180deg, #fff, #f8fafc);
    border: 1px solid var(--tiku-line);
    box-shadow: var(--tiku-shadow);
    text-decoration: none !important;
    transition: transform 0.25s var(--tiku-ease), border-color 0.25s ease;
}

.tiku-paper-item:hover {
    transform: translateY(-2px);
    border-color: rgba(22, 119, 255, 0.3);
}

.tiku-paper-item span {
    min-width: 0;
    font-size: 15px;
    font-weight: 450;
    color: var(--tiku-text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.tiku-paper-item em {
    flex: 0 0 auto;
    font-style: normal;
    font-size: 13px;
    font-weight: 450;
    color: var(--tiku-primary);
}

/* —— Category list page (keep polished) —— */
.tiku-list-wrap .tiku-page {
    padding-top: 24px;
}

.tiku-hero-compact {
    min-height: 0;
    grid-template-columns: 1fr;
    padding: 40px 40px 36px;
}

.tiku-hero-compact .tiku-title {
    font-size: 36px;
}

.tiku-breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin-bottom: 18px;
    font-size: 13px;
    color: var(--tiku-text-3);
}

.tiku-breadcrumb a {
    color: var(--tiku-text-2) !important;
    text-decoration: none !important;
}

.tiku-breadcrumb a:hover {
    color: var(--tiku-primary) !important;
}

.tiku-breadcrumb .is-current {
    color: var(--tiku-text);
    font-weight: 400;
}

.tiku-hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
}

.tiku-hero-meta span {
    display: inline-flex;
    align-items: center;
    height: 30px;
    padding: 0 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.16);
    color: rgba(255, 255, 255, 0.9);
    font-size: 12px;
    font-weight: 400;
}

.tiku-filter-bar {
    display: flex;
    gap: 12px;
    background: var(--tiku-surface);
    border: 1px solid var(--tiku-line);
    border-radius: 16px;
    padding: 14px 16px;
    margin-bottom: 12px;
    box-shadow: var(--tiku-shadow);
}

.tiku-filter-label {
    flex: 0 0 42px;
    color: var(--tiku-text-3);
    font-size: 13px;
    font-weight: 400;
    line-height: 28px;
}

.tiku-filter-items {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tiku-filter-items a {
    display: inline-flex;
    align-items: center;
    height: 28px;
    padding: 0 12px;
    border-radius: 999px;
    color: var(--tiku-text-2) !important;
    text-decoration: none !important;
    font-size: 13px;
    font-weight: 400;
    background: #f3f5f8;
}

.tiku-filter-items a.active,
.tiku-filter-items a:hover {
    background: var(--tiku-primary-soft);
    color: var(--tiku-primary) !important;
}

.tiku-problems {
    background: var(--tiku-surface);
    border: 1px solid var(--tiku-line);
    border-radius: var(--tiku-radius);
    box-shadow: var(--tiku-shadow);
    overflow: hidden;
}

.tiku-problems-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 18px 22px;
    border-bottom: 1px solid var(--tiku-line);
}

.tiku-problems-head h2 {
    margin: 0;
    font-size: 18px;
    font-weight: 450;
}

.tiku-problems-count {
    font-size: 13px;
    color: var(--tiku-text-3);
    font-weight: 400;
}

.tiku-problem-list {
    display: flex;
    flex-direction: column;
}

.tiku-problem-headrow,
.tiku-problem-row {
    display: grid;
    grid-template-columns: 120px minmax(0, 1fr) minmax(140px, 0.9fr) 72px 28px;
    align-items: center;
    gap: 12px;
    padding: 0 22px;
}

.tiku-problem-headrow {
    height: 40px;
    background: #fafbfc;
    border-bottom: 1px solid var(--tiku-line);
    font-size: 12px;
    font-weight: 450;
    color: var(--tiku-text-3);
}

.tiku-problem-row {
    min-height: 56px;
    padding-top: 12px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--tiku-line);
    color: inherit;
    text-decoration: none !important;
    transition: background 0.18s ease;
}

.tiku-problem-row:last-child { border-bottom: none; }
.tiku-problem-row:hover { background: var(--tiku-primary-soft); }

.tiku-problem-no {
    font-size: 13px;
    font-weight: 450;
    color: var(--tiku-text-2);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.tiku-problem-title {
    min-width: 0;
    font-size: 14px;
    font-weight: 400;
    color: var(--tiku-text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.tiku-problem-mainline {
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.tiku-problem-year {
    font-size: 12px;
    font-weight: 400;
    color: var(--tiku-text-3);
}

.tiku-problem-row:hover .tiku-problem-title,
.tiku-problem-row:hover .tiku-problem-no {
    color: var(--tiku-primary);
}

.tiku-problem-tag,
.tiku-problem-type {
    font-size: 12px;
    font-weight: 400;
    color: var(--tiku-text-3);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.tiku-problem-ktags {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 6px;
    min-width: 0;
}

.tiku-problem-ktag {
    display: inline-flex;
    align-items: center;
    height: 22px;
    padding: 0 8px;
    border-radius: 999px;
    background: #f3f5f8;
    color: var(--tiku-text-3);
    font-size: 11px;
    font-weight: 400;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.tiku-problem-go {
    color: var(--tiku-text-3);
    text-align: center;
    transition: transform 0.18s ease, color 0.18s ease;
}

.tiku-problem-row:hover .tiku-problem-go {
    color: var(--tiku-primary);
    transform: translateX(2px);
}

.tiku-empty,
.tiku-empty-block {
    color: var(--tiku-text-3);
    text-align: center;
}

.tiku-empty-block {
    padding: 48px 20px;
}

.tiku-empty-block strong {
    display: block;
    margin-bottom: 6px;
    color: var(--tiku-text-2);
    font-size: 16px;
}

.tiku-empty-block p {
    margin: 0;
    font-size: 14px;
}

.tiku-pager {
    margin-top: 24px;
    text-align: center;
}

.tiku-pager .pagination {
    display: inline-flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.tiku-pager .pagination > li { display: inline-block; }

.tiku-pager .pagination > li > a,
.tiku-pager .pagination > li > span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 34px;
    height: 34px;
    padding: 0 10px;
    border-radius: 8px;
    border: 1px solid var(--tiku-line);
    background: #fff;
    color: var(--tiku-text-2);
    text-decoration: none !important;
    font-size: 13px;
    font-weight: 400;
}

.tiku-pager .pagination > li > a:hover {
    border-color: rgba(22, 119, 255, 0.35);
    color: var(--tiku-primary);
    background: var(--tiku-primary-soft);
}

.tiku-pager .pagination > .active > a,
.tiku-pager .pagination > .active > span {
    background: var(--tiku-primary);
    border-color: var(--tiku-primary);
    color: #fff;
}

.tiku-pager .pagination > .disabled > a,
.tiku-pager .pagination > .disabled > span {
    opacity: 0.45;
    pointer-events: none;
}

@keyframes tiku-rise {
    from { opacity: 0; transform: translateY(14px); }
    to { opacity: 1; transform: none; }
}

@keyframes tiku-drift {
    from { transform: scale(1.04) translate3d(0, 0, 0); }
    to { transform: scale(1.08) translate3d(-1.5%, 1%, 0); }
}

@media (max-width: 991px) {
    .tiku-hero {
        grid-template-columns: 1fr;
        min-height: 0;
        padding: 36px 28px 32px;
    }

    .tiku-title { font-size: 40px; }

    .tiku-hero-stat {
        justify-self: start;
        text-align: left;
    }

    .tiku-hero-stat strong { font-size: 48px; }

    .tiku-cats {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .tiku-spotlight,
    .tiku-paper-row {
        grid-template-columns: 1fr;
    }

    .tiku-problem-headrow { display: none; }

    .tiku-problem-row {
        grid-template-columns: minmax(0, 1fr) 28px;
        padding: 14px 16px;
    }

    .tiku-problem-no,
    .tiku-problem-tag,
    .tiku-problem-ktags,
    .tiku-problem-type {
        display: none;
    }
}

@media (max-width: 640px) {
    .tiku-page { padding-top: 20px; }

    .tiku-hero,
    .tiku-hero-compact {
        padding: 28px 20px 24px;
        border-radius: 18px;
    }

    .tiku-title { font-size: 34px; }

    .tiku-block-title { font-size: 22px; }

    .tiku-cats {
        grid-template-columns: 1fr 1fr;
    }

    .tiku-cat {
        min-height: 92px;
        padding: 16px 14px;
        gap: 14px;
    }

    .tiku-cat strong { font-size: 14px; }
    .tiku-cat span { font-size: 20px; }
}