@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;600;700&family=Noto+Serif+SC:wght@400;500;600;700;800;900&family=Playfair+Display:wght@500;600;700&family=Long+Cang&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;500;600;700;800&family=Ma+Shan+Zheng&family=ZCOOL+QingKe+HuangYou&family=ZCOOL+KuaiLe&family=Liu+Jian+Mao+Cao&display=swap');

/* ===== 基础样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4a90e2;
    --primary-hover: #3a7bc8;
    --secondary-color: #5a6c7d;
    --background: #ffffff;
    --surface: #f8fafc;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --success-color: #22c55e;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    /* 活动分类颜色（明朗清爽） */
    --category-school: #4a90e2;
    --category-report: #f59e0b;
    --category-major: #ef4444;
    --category-hot: #8b5cf6;
    /* 日历：星期栏深蓝、日期格浅蓝 */
    --calendar-weekday-bar: #4a75a8;
    --calendar-weekday-bar-text: #ffffff;
    --calendar-cell: #e8f0fe;
    --calendar-cell-hover: #d2e3fc;
}

body {
    font-family: "Noto Serif SC", "Source Han Serif CN", "宋体", serif;
    background: #ffffff;
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* 标题沿用正文字体，用稍轻字重显得更柔和 */
h1, h2, h3, .logo, .welcome-title, .page-header h1, .calendar-header h2, .events-sidebar-header h3, .modal-content h2, .section-title, .resource-card-title, .datasource-card-title {
    font-weight: 500;
    letter-spacing: 0.02em;
}

/* ===== 首页欢迎区域 ===== */
.welcome-section {
    max-width: 1000px;
    margin: 0 auto;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    position: relative;
    animation: fadeInUp 0.8s ease-out;
}

.welcome-image-container {
    position: relative;
    width: 100%;
    height: 500px;
    overflow: hidden;
}

.welcome-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.welcome-image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(15, 23, 42, 0.6) 0%, rgba(30, 41, 59, 0.7) 100%);
}

.welcome-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    z-index: 2;
    width: 90%;
    max-width: 800px;
}

.welcome-title {
    font-size: 3rem;
    font-weight: 700;
    font-family: "Noto Serif SC", "Source Han Serif CN", "宋体", serif;
    color: white;
    margin-bottom: 1rem;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    letter-spacing: -0.02em;
}

.welcome-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.95);
    font-weight: 300;
}

/* 首页：无动画无框，整页大图 + 标题「HKBU DMC资源库」，背景图覆盖到导航栏，无遮罩模糊 */
.page-index .main-content {
    max-width: none;
    margin: 0;
    padding: 0;
}

.page-index .welcome-section {
    max-width: none;
    margin: 0;
    border-radius: 0;
    box-shadow: none;
    animation: none;
}

.page-index .welcome-image-container {
    height: 100vh;
    position: relative;
    overflow: hidden;
}

.page-index .welcome-image {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.page-index .welcome-image-overlay {
    display: none;
}

.page-index .navbar {
    background: transparent;
    border-bottom: none;
    box-shadow: none;
}

.page-index .navbar::after {
    display: block;
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    max-width: 720px;
    height: 1px;
    background: #d8d8d8;
}

.page-index .logo {
    display: none;
}

.page-index .nav-container {
    justify-content: center;
}

.page-index .nav-menu {
    gap: 4.5rem;
}

.page-index .nav-menu a {
    font-weight: 600;
}

.page-index .welcome-text {
    top: 70%;
    transform: translate(-50%, -50%);
    background: rgba(255, 255, 255, 0.15);
    padding: 0.4rem 0.4rem;
    border-radius: 8px;
    backdrop-filter: blur(6px);
    display: inline-block;
}

.page-index .welcome-title {
    margin-bottom: 0;
    line-height: 1.3;
    color: #ffffff;
    font-size: 4rem;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

/* 首页标题：现代感艺术字体 - 英文 Syne，中文 站酷庆科黄油体 */
.page-index .welcome-title-main {
    font-family: "Syne", "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.page-index .welcome-title-sub {
    font-family: "Ma Shan Zheng", "Long Cang", "KaiTi", "楷体", cursive;
    font-size: 1.15em;
    font-weight: 400;
    letter-spacing: 0.05em;
}

.page-index .welcome-below-title-wrap {
    position: relative;
    margin: 1.5rem auto 0;
    max-width: 560px;
    width: 90%;
    overflow: hidden;
}

.page-index .welcome-below-title-img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 0;
    vertical-align: top;
    -webkit-mask-image: radial-gradient(ellipse 85% 85% at 50% 50%, black 55%, transparent 100%);
    mask-image: radial-gradient(ellipse 85% 85% at 50% 50%, black 55%, transparent 100%);
    -webkit-mask-size: 100% 100%;
    mask-size: 100% 100%;
    -webkit-mask-position: center;
    mask-position: center;
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
}

.page-index .welcome-below-title-wrap::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 45%;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.35), transparent);
    pointer-events: none;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== 导航栏 ===== */
.navbar {
    background: #ffffff;
    padding: 1rem 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    transition: transform 0.25s ease;
}

.navbar::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    max-width: 720px;
    height: 1px;
    background: #e5e5e5;
}

.navbar.navbar--hidden {
    transform: translateY(-100%);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.75rem;
    font-weight: 900;
    font-family: "Noto Serif SC", "Source Han Serif CN", "宋体", serif;
    letter-spacing: 0.04em;
    color: #172554;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* ===== 主内容区 ===== */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.page-header {
    text-align: center;
    margin-bottom: 3rem;
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

/* 大事一览页面标题使用衬线体 */
.page-calendar .page-header h1 {
    font-family: "Noto Serif SC", "Source Han Serif CN", "宋体", serif;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* ===== 日历容器 ===== */
.calendar-wrapper {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 0;
    margin-bottom: 2rem;
    background: var(--background);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

@media (max-width: 1024px) {
    .calendar-wrapper {
        grid-template-columns: 1fr;
    }
}

.calendar-container {
    padding: 2rem;
}

.calendar-legend {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0.75rem 1.25rem;
    margin: 0 0 1.25rem 0;
    padding: 0;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.legend-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    display: inline-block;
}

.legend-dot.legend-school {
    background: var(--category-school);
}

.legend-dot.legend-report {
    background: var(--category-report);
}

.legend-dot.legend-event {
    background: var(--category-major);
}

.legend-dot.legend-hot {
    background: var(--category-hot);
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.calendar-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-btn {
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--primary-color);
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: var(--transition);
}

.nav-btn:hover {
    background: var(--surface);
}

/* ===== 日历网格（传统日历风格） ===== */
.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    background: var(--border-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.calendar-day-header {
    text-align: center;
    font-weight: 500;
    color: var(--calendar-weekday-bar-text);
    padding: 0.5rem;
    font-size: 0.8125rem;
    background: var(--calendar-weekday-bar);
}

.calendar-day {
    min-height: 4.5rem;
    padding: 0.5rem;
    cursor: pointer;
    transition: background 0.2s ease;
    background: var(--calendar-cell);
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    border: none;
    border-radius: 0;
}

.calendar-day:hover:not(.other-month) {
    background: var(--calendar-cell-hover);
}

.calendar-day.selected:not(.other-month) {
    background: var(--calendar-cell-hover);
}

.calendar-day.other-month {
    background: var(--surface);
    color: var(--text-secondary);
    opacity: 0.5;
    cursor: default;
}

.calendar-day.today .calendar-day-number {
    background: var(--primary-color);
    color: #fff;
    font-weight: 600;
}

.calendar-day-number {
    width: 1.75rem;
    height: 1.75rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8125rem;
    font-weight: 600;
    flex-shrink: 0;
    margin-bottom: 0.35rem;
}

.calendar-day-events {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
    width: 100%;
}

.event-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    flex-shrink: 0;
}

.calendar-event-row {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    width: 100%;
    min-width: 0;
}

.calendar-event-row .event-dot {
    flex-shrink: 0;
}

.calendar-event-title {
    font-size: 0.65rem;
    line-height: 1.2;
    color: #1e293b;
    padding: 0.1rem 0.35rem;
    border-radius: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
    flex: 1;
}

.calendar-event-school .calendar-event-title {
    background: rgba(74, 144, 226, 0.12);
}

.calendar-event-report .calendar-event-title {
    background: rgba(245, 158, 11, 0.12);
}

.calendar-event-major .calendar-event-title {
    background: rgba(239, 68, 68, 0.12);
}

.calendar-event-hot .calendar-event-title {
    background: rgba(139, 92, 246, 0.12);
}

.event-dot.school {
    background: var(--category-school);
}

.event-dot.report {
    background: var(--category-report);
}

.event-dot.major {
    background: var(--category-major);
}

.event-dot.hot {
    background: var(--category-hot);
}

/* ===== 活动侧边栏 ===== */
.events-sidebar {
    padding: 1.5rem;
    border-left: 1px solid var(--border-color);
    background: var(--surface);
    position: sticky;
    top: 100px;
}

.events-sidebar-header {
    margin-bottom: 0.75rem;
}

.events-sidebar-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.btn-add-event {
    width: auto;
    margin-top: 1rem;
    padding: 0.4rem 1rem;
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: 9999px;
}

/* 大事一览：添加活动按钮与「添加数据源」同款风格（透明底 + 描边 + 悬停填色） */
.page-calendar .calendar-wrapper {
    font-family: "Noto Serif SC", "Source Han Serif CN", "宋体", serif;
    font-weight: 600;
}

.page-calendar .btn-add-event {
    background: transparent;
    color: var(--calendar-weekday-bar);
    border: 1px solid var(--calendar-weekday-bar);
}

.page-calendar .btn-add-event:hover {
    background: var(--calendar-weekday-bar);
    color: #fff;
}

.event-item {
    padding: 0.6rem 0 0.6rem 0.75rem;
    border-left: 3px solid transparent;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 0;
    cursor: pointer;
    transition: var(--transition);
}

.event-item.school {
    border-left-color: var(--category-school);
}

.event-item.report {
    border-left-color: var(--category-report);
}

.event-item.major {
    border-left-color: var(--category-major);
}

.event-item.hot {
    border-left-color: var(--category-hot);
}

.event-item:hover {
    background: var(--surface);
}

.event-item-title {
    font-weight: 600;
    margin-bottom: 0.15rem;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.event-item-time {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.event-item-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.4;
    margin-top: 0.15rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ===== 现有选题（呈现方式同「资源共享」：区块 + 条状卡片） ===== */
.topic-summary {
    margin-top: 2.5rem;
    padding-top: 0;
}

.topic-summary .topic-section-head {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.25rem;
    padding: 0;
}

.topic-summary .section-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.topic-section {
    margin-bottom: 1.5rem;
}

.topic-section:not(.topic-summary-completed) {
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 0;
    background: var(--background);
    overflow: hidden;
}

.topic-section:not(.topic-summary-completed) .topic-grid {
    padding: 0 1.25rem 1.25rem 1.25rem;
}

.topic-section-heading {
    display: block;
    width: 100%;
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--text-primary);
    background: var(--calendar-cell);
    padding: 0.5rem 1.25rem;
    margin: 0 0 0.75rem 0;
}

.topic-grid {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.topic-card {
    display: block;
    padding: 0.75rem 0 0.75rem 0.75rem;
    border-left: 4px solid #d4a84b;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background 0.15s;
}

.topic-card:hover {
    background: rgba(0, 0, 0, 0.02);
}

.topic-card:last-child {
    border-bottom: none;
}

.topic-card-row {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
}

.topic-card-main {
    flex: 1;
    min-width: 0;
    padding-right: 0.75rem;
}

.topic-card-main .topic-card-desc {
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.topic-card-main .topic-card-reporter {
    margin-top: 0.35rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.topic-card-right {
    flex-shrink: 0;
}

.topic-card-status {
    font-size: 0.8125rem;
    padding: 0.25rem 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--background);
    color: var(--text-primary);
    cursor: pointer;
    min-width: 5.5em;
}

.topic-card-status:focus {
    outline: none;
    border-color: var(--primary-color);
}

.topic-grid-empty {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    padding: 0.75rem 0;
    margin: 0;
}

.topic-summary-completed {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.topic-summary-completed-toggle {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    width: 100%;
    padding: 0.5rem 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
}

.topic-summary-completed-toggle:hover {
    color: var(--text-primary);
}

.topic-summary-completed-label {
    font-weight: 500;
}

.topic-summary-completed-arrow {
    margin-left: auto;
    font-size: 0.75rem;
}

#summaryCompleted.topic-grid {
    margin-top: 0.5rem;
}

/* ===== 模态框 ===== */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    animation: fadeIn 0.2s ease;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--background);
    border-radius: 16px;
    padding: 2rem;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: slideUp 0.3s ease;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.close {
    position: absolute;
    right: 1.5rem;
    top: 1.5rem;
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.close:hover {
    color: var(--text-primary);
}

.modal-content h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

/* 添加活动弹窗：方框缩小，字体大小不变 */
.modal-content--compact {
    max-width: 380px;
    padding: 1.25rem 1.5rem;
}

.modal-content--compact .close {
    right: 1.25rem;
    top: 1.25rem;
}

.modal-content--compact h2 {
    margin-bottom: 1rem;
}

.modal-content--compact .form-group {
    margin-bottom: 1rem;
}

.modal-content--compact .form-actions {
    margin-top: 1.25rem;
}

/* ===== 表单 ===== */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-hint,
.required-hint {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.required-hint {
    color: var(--primary-color);
}

.form-group input[type="file"] {
    padding: 0.5rem 0;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
    background: var(--background);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

/* ===== 按钮 ===== */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
}

/* ===== 资源库页面 ===== */
.resources-container {
    max-width: 1000px;
    margin: 0 auto;
}

.upload-section {
    text-align: center;
    margin-bottom: 2rem;
}

.filter-section {
    margin-bottom: 2rem;
}

.search-box {
    position: relative;
    margin-bottom: 1.5rem;
}

.search-box input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
}

.search-icon {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.filter-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.filter-tag {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background: var(--background);
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.filter-tag:hover,
.filter-tag.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.resource-card {
    background: #f5f5f5;
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    cursor: pointer;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.resource-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-hover));
    transform: scaleX(0);
    transition: var(--transition);
}

.resource-card:hover::before {
    transform: scaleX(1);
}

.resource-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.resource-card-image {
    width: 100%;
    margin: -1.5rem -1.5rem 1rem -1.5rem;
    border-radius: 16px 16px 0 0;
    overflow: hidden;
    background: var(--surface);
    aspect-ratio: 16 / 10;
    display: flex;
    align-items: center;
    justify-content: center;
}

.resource-card-image img {
    width: 100%;
    height: 100%;
    object-fit: fill;
    object-position: center;
    display: block;
}

.resource-card-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 1rem;
}

.resource-card-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    flex: 1;
}

.resource-card-category {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--surface);
    border-radius: 12px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.resource-card-description {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    line-height: 1.5;
}

.resource-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.resource-card-author {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.resource-card-actions {
    display: flex;
    gap: 0.75rem;
}

.action-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.125rem;
    transition: var(--transition);
    padding: 0.25rem;
    border-radius: 4px;
}

.action-btn:hover {
    background: var(--surface);
}

.action-btn.liked {
    color: #ef4444;
}

.action-btn.bookmarked {
    color: var(--primary-color);
}

.action-btn--delete {
    color: var(--text-secondary);
}

.action-btn--delete:hover {
    color: #ef4444;
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    .main-content {
        padding: 1rem;
    }
    
    .calendar-grid {
        gap: 0.25rem;
    }
    
    .calendar-day {
        padding: 0.25rem;
        font-size: 0.875rem;
    }
    
    .resources-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-container {
        padding: 0 1rem;
        flex-wrap: wrap;
    }
    
    .nav-menu {
        gap: 0.75rem;
        font-size: 0.875rem;
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
    
    .welcome-image-container {
        height: 400px;
    }
    
    .welcome-title {
        font-size: 2rem;
    }
    
    .welcome-subtitle {
        font-size: 1rem;
    }
    
    .calendar-wrapper {
        grid-template-columns: 1fr;
    }
    
    .events-sidebar {
        border-left: none;
        border-top: 1px solid var(--border-color);
    }
    
    .calendar-legend {
        flex-wrap: wrap;
        gap: 1rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
}

/* ===== 资源共享页面（条状、无动画、无 emoji） ===== */
.datasources-container {
    max-width: 1200px;
    margin: 0 auto;
}

.datasource-section {
    margin-bottom: 4rem;
}

.datasource-section-head {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.25rem;
    padding: 1rem 1.25rem;
    border-bottom: 2px solid var(--primary-color);
    background: linear-gradient(90deg, rgba(74, 117, 168, 0.08) 0%, transparent 100%);
}

.datasource-section-toggle {
    flex-shrink: 0;
    width: 2rem;
    height: 2rem;
    padding: 0;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.datasource-section-toggle:hover {
    color: var(--primary-color);
    background: rgba(0, 0, 0, 0.05);
}

.datasource-section-arrow {
    font-size: 0.75rem;
}

.datasource-grid.datasource-grid--collapsible[hidden] {
    display: none;
}

.datasource-section .section-title {
    display: block;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    border: none;
}

.btn-add-datasource {
    padding: 0.4rem 1rem;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--primary-color);
    background: transparent;
    border: 1px solid var(--primary-color);
    border-radius: 9999px;
    cursor: pointer;
}

.btn-add-datasource:hover {
    background: var(--primary-color);
    color: #fff;
}

.datasource-grid {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.datasource-card {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.5rem 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    background: transparent;
}

.datasource-card:last-child {
    border-bottom: none;
}

.datasource-card-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0;
    display: flex;
    align-items: center;
    flex: 1 1 auto;
    min-width: 0;
}

.datasource-card-title a {
    color: var(--text-primary);
    text-decoration: none;
    background: #fef9e7;
    padding: 0.2em 0.5em;
    border-radius: 4px;
}

.datasource-card-title a:hover {
    color: var(--primary-color);
    background: #fef3c7;
}

.datasource-card-description {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.5;
    margin: 0;
    flex: 1 1 100%;
    order: 3;
}

.datasource-card-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    flex-shrink: 0;
}

.datasource-card-link::after {
    content: '→';
}