/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #5AA0FF;
    --primary-light: #88C1FF;
    --primary-dark: #3A6EA5;
    --secondary-color: #7A95B6;
    --danger-color: #FF6B6B;
    --success-color: #51CF66;
    --warning-color: #FFD700;
    --background: #F0F7FF;
    --card-bg: #FFFFFF;
    --text-primary: #3A6EA5;
    --text-secondary: #7A95B6;
    --border-color: #E5E5E5;
    --shadow: 0 2px 8px rgba(90, 160, 255, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, var(--background) 0%, #E6F2FF 100%);
    min-height: 100vh;
    color: var(--text-primary);
}

/* 登录页面 */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.login-card {
    background: var(--card-bg);
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(90, 160, 255, 0.2);
    padding: 40px;
    width: 100%;
    max-width: 420px;
}

.logo-section {
    text-align: center;
    margin-bottom: 32px;
}

.logo-section h1 {
    font-size: 28px;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.subtitle {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 表单样式 */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s;
    background: var(--card-bg);
    color: var(--text-primary);
}

.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(90, 160, 255, 0.1);
}

.form-group textarea {
    resize: vertical;
    font-family: inherit;
}

.form-group small {
    display: block;
    margin-top: 4px;
    font-size: 12px;
    color: var(--text-secondary);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.required {
    color: var(--danger-color);
}

/* 按钮样式 */
.btn-primary,
.btn-secondary {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    color: white;
    width: 100%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(90, 160, 255, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

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

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

.loading {
    display: inline-block;
}

/* 错误提示 */
.error-message {
    color: var(--danger-color);
    font-size: 13px;
    margin-top: 12px;
    text-align: center;
}

/* 导航栏 */
.navbar {
    background: white;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar h1 {
    font-size: 24px;
    color: var(--primary-color);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-email {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 主内容区 */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px;
}

.action-bar {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}

.action-bar .btn-primary,
.action-bar .btn-secondary {
    width: auto;
}

/* 加载指示器 */
.loading-indicator {
    text-align: center;
    padding: 60px 20px;
}

.spinner {
    border: 3px solid var(--background);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 16px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 公告列表 */
.announcements-list {
    display: grid;
    gap: 16px;
}

.announcement-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.announcement-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(90, 160, 255, 0.2);
}

.announcement-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.announcement-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
}

.announcement-badges {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
    margin-left: 16px;
}

.badge {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.badge-important {
    background: rgba(255, 107, 107, 0.1);
    color: var(--danger-color);
}

.badge-normal {
    background: rgba(122, 149, 182, 0.1);
    color: var(--secondary-color);
}

.badge-deleted {
    background: rgba(0, 0, 0, 0.1);
    color: #666;
}

.announcement-content {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 12px;
    white-space: pre-wrap;
}

.announcement-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.announcement-actions {
    display: flex;
    gap: 8px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

.btn-edit,
.btn-delete {
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-edit {
    background: rgba(90, 160, 255, 0.1);
    color: var(--primary-color);
}

.btn-edit:hover {
    background: rgba(90, 160, 255, 0.2);
}

.btn-delete {
    background: rgba(255, 107, 107, 0.1);
    color: var(--danger-color);
}

.btn-delete:hover {
    background: rgba(255, 107, 107, 0.2);
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-secondary);
    font-size: 16px;
}

/* 弹窗 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    overflow-y: auto;
    padding: 20px;
}

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

.modal-content {
    background: white;
    border-radius: 16px;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 20px;
    color: var(--text-primary);
}

.close-btn {
    background: none;
    border: none;
    font-size: 28px;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.3s;
}

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

.modal-content form {
    padding: 24px;
}

.modal-footer {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    padding-top: 20px;
}

.modal-footer .btn-primary,
.modal-footer .btn-secondary {
    width: auto;
    min-width: 100px;
}

/* Toast 提示 */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: white;
    color: var(--text-primary);
    padding: 16px 24px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 2000;
    display: none;
    animation: slideIn 0.3s ease;
}

.toast.show {
    display: block;
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--danger-color);
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }

    .nav-content {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }

    .announcement-header {
        flex-direction: column;
        gap: 8px;
    }

    .announcement-badges {
        margin-left: 0;
    }

    .action-bar {
        flex-direction: column;
    }

    .action-bar .btn-primary,
    .action-bar .btn-secondary {
        width: 100%;
    }
}