/* ============================================
   学术导航网站 - 应用样式
   基于 TDesign 框架
   ============================================ */

/* --- Global --- */
body {
    background: #fff;
}

/* --- Header --- */
.site-header {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--td-border-level-1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header__inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.site-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--td-brand-color);
}

.site-logo__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--td-brand-color-light);
    border-radius: var(--td-radius-medium);
}

.site-logo__text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.site-logo__text strong {
    font-size: 18px;
    font-weight: 700;
    color: var(--td-text-color-primary);
}

.site-logo__text small {
    font-size: 11px;
    color: var(--td-text-color-placeholder);
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.site-nav a {
    padding: 6px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--td-text-color-secondary);
    border-radius: var(--td-radius-default);
    transition: all var(--td-transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.site-nav a:hover {
    color: var(--td-brand-color);
    background: var(--td-brand-color-light);
}

.site-nav a.active {
    color: var(--td-brand-color);
    background: var(--td-brand-color-light);
}

/* --- Main Content --- */
.main-content {
    min-height: calc(100vh - 200px);
    padding: var(--td-spacing-6) 0;
}

.login-page.main-content {
    flex: 1;
    min-height: 0;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 24px 0;
}

.login-body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.login-page .t-container {
    display: flex;
    justify-content: flex-end;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 48px;
}

@media (max-width: 768px) {
    .login-page.main-content {
        justify-content: center;
    }
    .login-page .t-container {
        justify-content: center;
        padding: 0 24px;
    }
}

.page-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: var(--td-spacing-5);
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--td-spacing-5);
}

.page-header h1 {
    font-size: 24px;
    font-weight: 700;
}

/* ============================================
   Hero Section — 白底 + 毛玻璃 + 弹跳球形
   ============================================ */
.hero {
    background: #fff;
    padding: 80px 0 64px;
    position: relative;
    overflow: hidden;
}

/* 弹跳球形装饰容器 */
.hero__balls {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

/* 单个球形 */
.hero__ball {
    position: absolute;
    border-radius: 50%;
    opacity: 0.55;
    animation: ballBounce var(--dur, 6s) ease-in-out infinite;
    animation-delay: var(--delay, 0s);
}

.hero__ball--1 {
    width: 120px;
    height: 120px;
    left: 6%;
    top: 15%;
    background: radial-gradient(circle at 35% 35%, #6ba6ff, #0052d9);
    --dur: 5.5s;
    --delay: 0s;
}

.hero__ball--2 {
    width: 80px;
    height: 80px;
    right: 10%;
    top: 10%;
    background: radial-gradient(circle at 35% 35%, #b4d8ff, #4d94ff);
    --dur: 7s;
    --delay: 0.5s;
}

.hero__ball--3 {
    width: 60px;
    height: 60px;
    left: 20%;
    bottom: 10%;
    background: radial-gradient(circle at 35% 35%, #d4e8ff, #80b3ff);
    --dur: 6s;
    --delay: 1s;
}

.hero__ball--4 {
    width: 100px;
    height: 100px;
    right: 18%;
    bottom: 8%;
    background: radial-gradient(circle at 35% 35%, #6ba6ff, #003cab);
    --dur: 8s;
    --delay: 1.5s;
}

.hero__ball--5 {
    width: 45px;
    height: 45px;
    left: 48%;
    top: 8%;
    background: radial-gradient(circle at 35% 35%, #e0eeff, #a0c8ff);
    --dur: 5s;
    --delay: 0.8s;
}

/* 弹跳动画 */
@keyframes ballBounce {
    0%, 100% {
        transform: translateY(0) scale(1);
    }
    50% {
        transform: translateY(-40px) scale(1.05);
    }
}

/* Hero 内容容器 */
.hero__inner {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 40px 0;
}

.hero__title {
    font-size: 36px;
    font-weight: 800;
    line-height: 1.3;
    margin: 0 0 16px;
    letter-spacing: -0.5px;
    color: var(--td-text-color-primary);
    display: block;
    width: 100%;
}

.hero__subtitle {
    font-size: 18px;
    color: var(--td-text-color-secondary);
    line-height: 1.6;
    display: block;
    width: 100%;
}

@media (max-width: 768px) {
    .hero { padding: 48px 0 40px; }
    .hero__title { font-size: 24px; }
    .hero__subtitle { font-size: 14px; }
    .hero__ball--1 { width: 80px; height: 80px; }
    .hero__ball--2 { width: 56px; height: 56px; }
    .hero__ball--3 { width: 44px; height: 44px; }
    .hero__ball--4 { width: 68px; height: 68px; }
    .hero__ball--5 { width: 32px; height: 32px; }
}

/* ============================================
   Stats Section
   ============================================ */
.stats-section {
    margin-top: -32px;
    position: relative;
    z-index: 2;
    padding-bottom: var(--td-spacing-2);
}

.stat-card {
    border: none;
    box-shadow: var(--td-shadow-1);
}

/* ============================================
   Sections
   ============================================ */
.section {
    padding: var(--td-spacing-8) 0;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--td-spacing-5);
}

.section-title {
    font-size: 22px;
    font-weight: 700;
}

/* ============================================
   Category Cards
   ============================================ */
.category-card {
    text-decoration: none;
    color: inherit;
    transition: transform var(--td-transition), box-shadow var(--td-transition);
}

.category-card:hover {
    transform: translateY(-2px);
}

.category-card__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--td-spacing-2);
}

.category-card__count {
    font-size: 13px;
    font-weight: 600;
    color: var(--td-text-color-secondary);
}

.category-card__desc {
    font-size: 13px;
    color: var(--td-text-color-secondary);
    line-height: 1.5;
}

/* ============================================
   Paper Cards (List + Home)
   ============================================ */
.paper-list {
    display: grid;
    gap: var(--td-spacing-4);
}

.paper-card {
    transition: box-shadow var(--td-transition), border-color var(--td-transition);
}

.paper-card:hover {
    border-color: var(--td-brand-color);
}

.paper-card__head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--td-spacing-3);
    margin-bottom: var(--td-spacing-2);
}

.paper-card__title {
    font-size: var(--td-font-size-lg);
    font-weight: 600;
    line-height: 1.4;
}

.paper-card__title a {
    color: var(--td-text-color-primary);
    text-decoration: none;
}

.paper-card__title a:hover {
    color: var(--td-brand-color);
}

.paper-card__meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--td-spacing-3);
    margin-bottom: var(--td-spacing-2);
    font-size: 13px;
    color: var(--td-text-color-secondary);
}

.paper-card__meta-item {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.paper-card__abstract {
    font-size: 13px;
    color: var(--td-text-color-secondary);
    line-height: 1.7;
    margin-bottom: var(--td-spacing-3);
}

.paper-card__keywords {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

/* ============================================
   Paper Search Bar
   ============================================ */
.paper-search-bar {
    display: flex;
    gap: var(--td-spacing-2);
    margin-bottom: var(--td-spacing-5);
    align-items: center;
}

.paper-search-input {
    flex: 1;
}

.paper-search-select {
    width: 160px;
    flex-shrink: 0;
}

@media (max-width: 768px) {
    .paper-search-bar { flex-direction: column; }
    .paper-search-select { width: 100%; }
}

/* ============================================
   Paper Detail
   ============================================ */
.paper-detail {
    max-width: 900px;
    margin: 0 auto;
}

.paper-detail__head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--td-spacing-4);
    margin-bottom: var(--td-spacing-5);
}

.paper-detail__title {
    font-size: 26px;
    font-weight: 700;
    line-height: 1.4;
    flex: 1;
}

.paper-detail__meta {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--td-spacing-3);
    padding: var(--td-spacing-4);
    background: var(--td-bg-color-secondary);
    border-radius: var(--td-radius-medium);
    margin-bottom: var(--td-spacing-4);
}

.paper-detail__meta-item {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.paper-detail__meta-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--td-text-color-placeholder);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.paper-detail__meta-value {
    font-size: 14px;
    color: var(--td-text-color-primary);
    word-break: break-word;
}

.paper-detail__keywords {
    margin-bottom: var(--td-spacing-4);
}

.paper-detail__section {
    margin-bottom: var(--td-spacing-5);
}

.paper-detail__section-title {
    font-size: var(--td-font-size-lg);
    font-weight: 600;
    color: var(--td-brand-color);
    margin-bottom: var(--td-spacing-2);
    padding-left: 12px;
    border-left: 3px solid var(--td-brand-color);
}

.paper-detail__section-body {
    font-size: 14px;
    line-height: 1.8;
    color: var(--td-text-color-primary);
    white-space: pre-wrap;
}

.paper-detail__actions {
    display: flex;
    gap: var(--td-spacing-2);
    align-items: center;
    flex-wrap: wrap;
}

/* ============================================
   Login Page
   ============================================ */
/* --- Login Page --- */
.login-card {
    max-width: 400px;
    width: 100%;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: var(--td-radius-large);
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.12);
    padding: 40px;
    position: relative;
    overflow: hidden;
}

/* 钉钉二维码角标 */
.dingtalk-corner {
    position: absolute;
    top: 0;
    right: 0;
    width: 72px;
    height: 72px;
    text-decoration: none;
    cursor: pointer;
    z-index: 10;
}

.dingtalk-corner__triangle {
    position: absolute;
    top: 0;
    right: 0;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 72px 72px 0;
    border-color: transparent #1677ff transparent transparent;
    transition: border-color 0.2s;
}

.dingtalk-corner:hover .dingtalk-corner__triangle {
    border-color: transparent #0052d9 transparent transparent;
}

.dingtalk-corner__icon {
    position: absolute;
    top: 10px;
    right: 8px;
    color: #fff;
    width: 18px;
    height: 18px;
    z-index: 1;
}

.dingtalk-corner__label {
    position: absolute;
    bottom: 10px;
    left: 14px;
    font-size: 9px;
    font-weight: 600;
    color: #fff;
    white-space: nowrap;
    transform: rotate(-45deg);
    transform-origin: center;
    z-index: 1;
}

.login-card__header {
    text-align: center;
    margin-bottom: var(--td-spacing-6);
}

.login-card__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: var(--td-brand-color-light);
    color: var(--td-brand-color);
    border-radius: 50%;
    margin-bottom: var(--td-spacing-3);
}

.login-card__header h2 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 4px;
}

.login-card__header p {
    font-size: 13px;
    color: var(--td-text-color-placeholder);
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
    background: #fff;
    border-top: 1px solid var(--td-border-level-1);
    padding: var(--td-spacing-8) 0 var(--td-spacing-5);
    margin-top: var(--td-spacing-10);
}

/* 登录页 footer 透明背景 */
.site-footer--transparent {
    background: transparent !important;
    border-top: none !important;
    margin-top: 0 !important;
    padding: 12px 0 !important;
}

.site-footer--transparent .site-footer__bottom {
    border-top: none;
}

.site-footer--transparent .site-footer__bottom p {
    color: rgba(255, 255, 255, 0.85);
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.site-footer__inner {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--td-spacing-5);
}

.site-footer__brand {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.site-footer__brand strong {
    font-size: 16px;
}

.site-footer__brand span {
    font-size: 12px;
    color: var(--td-text-color-placeholder);
}

.site-footer__links {
    display: flex;
    gap: var(--td-spacing-4);
}

.site-footer__links a {
    font-size: 13px;
    color: var(--td-text-color-secondary);
}

.site-footer__bottom {
    border-top: 1px solid var(--td-border-level-1);
    padding-top: var(--td-spacing-4);
    text-align: center;
}

.site-footer__bottom p {
    font-size: 12px;
    color: var(--td-text-color-placeholder);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .site-header__inner {
        height: auto;
        flex-direction: column;
        gap: var(--td-spacing-2);
        padding: var(--td-spacing-3) 0;
    }
    
    .site-nav {
        flex-wrap: wrap;
        justify-content: center;
    }

    .site-footer__inner {
        flex-direction: column;
        gap: var(--td-spacing-3);
    }

    .paper-detail__head {
        flex-direction: column;
    }

    .paper-detail__title {
        font-size: 20px;
    }

    .paper-card__head {
        flex-direction: column;
    }

    .admin-grid-2 {
        grid-template-columns: 1fr !important;
    }
}

/* ============================================
   Multi-category Checkbox Group
   ============================================ */
.t-checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 8px 0;
}

.t-checkbox {
    display: inline-flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.t-checkbox input[type="checkbox"] {
    width: 16px;
    height: 16px;
    margin-right: 6px;
    cursor: pointer;
    accent-color: var(--td-brand-color, #0052d9);
}

.t-checkbox .t-tag {
    transition: opacity 0.2s;
}

.t-checkbox input[type="checkbox"]:not(:checked) + .t-tag {
    opacity: 0.5;
}

.t-checkbox input[type="checkbox"]:checked + .t-tag {
    opacity: 1;
}