/* ========================================
   图书管理系统 - 全局样式
   ======================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 学校主题配色 - 深蓝学术风 */
    --primary: #1E5AA8;
    --primary-dark: #164A8C;
    --primary-light: #3A7BC8;
    --accent: #E74C3C;
    --success: #27AE60;
    --warning: #F39C12;
    --danger: #E74C3C;
    --info: #3498DB;
    --bg: #F0F3F7;
    --card-bg: #FFFFFF;
    --text: #2C3E50;
    --text-light: #5A6C7D;
    --text-muted: #95A5A6;
    --border: #DFE6ED;
    --sidebar-bg: #1A2332;
    --sidebar-text: #A8B7C7;
    --sidebar-active: #1E5AA8;
    --sidebar-hover: #243447;
    --header-bg: #FFFFFF;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    font-size: 14px;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }

/* ========== 登录页 ========== */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #1E5AA8 0%, #2C3E50 100%);
    position: relative;
    overflow: hidden;
}

.login-container::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

.login-box {
    background: white;
    border-radius: 16px;
    padding: 50px 45px;
    width: 420px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    position: relative;
    z-index: 1;
}

.login-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 16px 16px 0 0;
}

.login-box h2 {
    text-align: center;
    margin-bottom: 10px;
    color: var(--text);
    font-size: 28px;
    font-weight: 600;
}

.login-box .subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 35px;
    display: block;
}

.login-box .logo {
    text-align: center;
    margin-bottom: 25px;
}

.login-box .logo-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 20px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    color: white;
    box-shadow: 0 8px 24px rgba(30,90,168,0.3);
}

.login-box .form-group {
    margin-bottom: 20px;
}

.login-box label {
    display: block;
    margin-bottom: 6px;
    color: var(--text-light);
    font-size: 14px;
}

.login-box input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.login-box input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(74,144,217,0.1);
}

.login-box .btn-login {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 12px rgba(30,90,168,0.3);
}

.login-box .btn-login:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(30,90,168,0.4);
}

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

/* ========== 主布局 ========== */
.layout {
    display: flex;
    min-height: 100vh;
}

/* 侧边栏 */
.sidebar {
    width: 240px;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    overflow-y: auto;
    z-index: 100;
    box-shadow: 2px 0 8px rgba(0,0,0,0.1);
}

.sidebar-header {
    padding: 28px 20px;
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    background: linear-gradient(135deg, rgba(30,90,168,0.2), rgba(30,90,168,0.05));
}

.sidebar-header .logo-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: white;
    margin-bottom: 12px;
    box-shadow: 0 4px 12px rgba(30,90,168,0.4);
}

.sidebar-header h3 {
    color: white;
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 4px;
}

.sidebar-header p {
    font-size: 12px;
    color: var(--sidebar-text);
    margin-top: 4px;
}

.sidebar-menu {
    list-style: none;
    padding: 16px 0;
}

.sidebar-menu li {
    margin: 4px 12px;
}

.sidebar-menu li a {
    display: flex;
    align-items: center;
    padding: 14px 16px;
    color: var(--sidebar-text);
    transition: all 0.3s;
    font-size: 14px;
    border-radius: 10px;
    position: relative;
}

.sidebar-menu li a:hover {
    background: var(--sidebar-hover);
    color: white;
    transform: translateX(4px);
}

.sidebar-menu li a.active {
    background: linear-gradient(90deg, rgba(30,90,168,0.15), rgba(30,90,168,0.05));
    color: white;
    border-left: 3px solid var(--primary);
    font-weight: 500;
}

.sidebar-menu li a.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 60%;
    background: var(--primary);
    border-radius: 0 4px 4px 0;
}

.sidebar-menu li a .icon {
    margin-right: 12px;
    font-size: 18px;
    width: 24px;
    text-align: center;
    opacity: 0.9;
}

/* 主内容区 */
.main-content {
    margin-left: 240px;
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* 顶部栏 */
.topbar {
    background: var(--header-bg);
    padding: 0 32px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    position: sticky;
    top: 0;
    z-index: 50;
    border-bottom: 1px solid var(--border);
}

.topbar h4 {
    font-size: 18px;
    color: var(--text);
    font-weight: 600;
    display: flex;
    align-items: center;
}

.topbar h4::before {
    content: '';
    width: 4px;
    height: 20px;
    background: var(--primary);
    border-radius: 2px;
    margin-right: 12px;
}

.topbar .user-info {
    display: flex;
    align-items: center;
    gap: 16px;
}

.topbar .user-info .user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 16px;
    font-weight: 600;
}

.topbar .user-info .user-name {
    font-size: 14px;
    color: var(--text);
    font-weight: 500;
}

.topbar .btn-logout {
    padding: 8px 20px;
    background: transparent;
    border: 1px solid var(--danger);
    color: var(--danger);
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.3s;
    font-weight: 500;
}

.topbar .btn-logout:hover {
    background: var(--danger);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(231,76,60,0.3);
}

/* 内容区 */
.content {
    padding: 32px;
    flex: 1;
    background: var(--bg);
}

/* 页面标题区域 */
.page-header {
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--border);
}

.page-header h1 {
    font-size: 24px;
    color: var(--text);
    font-weight: 600;
    margin-bottom: 8px;
}

.page-header p {
    font-size: 14px;
    color: var(--text-muted);
}

/* ========== 卡片 ========== */
.card {
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 24px;
    border: 1px solid var(--border);
    overflow: hidden;
}

.card-header {
    padding: 20px 24px;
    border-bottom: 2px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(to right, rgba(30,90,168,0.02), transparent);
}

.card-header h5 {
    font-size: 17px;
    color: var(--text);
    font-weight: 600;
    display: flex;
    align-items: center;
}

.card-header h5::before {
    content: '';
    width: 4px;
    height: 18px;
    background: var(--primary);
    border-radius: 2px;
    margin-right: 10px;
}

.card-body {
    padding: 24px;
}

/* ========== 统计卡片 ========== */
.stat-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 28px;
}

.stat-card {
    background: white;
    border-radius: 12px;
    padding: 28px 24px;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: 20px;
    border: 1px solid var(--border);
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    opacity: 0;
    transition: opacity 0.3s;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.stat-card:hover::before {
    opacity: 1;
}

.stat-card .stat-icon {
    width: 64px;
    height: 64px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: white;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.stat-card .stat-icon.blue { 
    background: linear-gradient(135deg, #1E5AA8, #3A7BC8); 
}
.stat-card .stat-icon.green { 
    background: linear-gradient(135deg, #27AE60, #2ECC71); 
}
.stat-card .stat-icon.orange { 
    background: linear-gradient(135deg, #F39C12, #F1C40F); 
}
.stat-card .stat-icon.red { 
    background: linear-gradient(135deg, #E74C3C, #EC7063); 
}

.stat-card .stat-info {
    flex: 1;
}

.stat-card .stat-info h3 {
    font-size: 32px;
    color: var(--text);
    line-height: 1;
    font-weight: 700;
    margin-bottom: 8px;
}

.stat-card .stat-info p {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 6px;
    font-weight: 500;
}

/* ========== 表格 ========== */
.table-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.search-bar {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

.search-bar input,
.search-bar select {
    padding: 10px 14px;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s;
    background: white;
}

.search-bar input:focus,
.search-bar select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(30,90,168,0.1);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

table th,
table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
}

table th {
    background: linear-gradient(to bottom, #F8F9FB, #F3F5F7);
    color: var(--text);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 12px;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--border);
}

table tbody tr {
    transition: all 0.2s;
}

table tbody tr:hover {
    background: rgba(30,90,168,0.03);
    transform: scale(1.001);
}

table tbody tr:last-child td {
    border-bottom: none;
}

/* ========== 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
    gap: 6px;
    font-weight: 500;
    box-shadow: 0 2px 4px rgba(0,0,0,0.08);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

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

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

.btn-success { 
    background: linear-gradient(135deg, #27AE60, #2ECC71);
    color: white; 
}
.btn-success:hover { 
    background: linear-gradient(135deg, #229954, #27AE60);
}

.btn-warning { 
    background: linear-gradient(135deg, #F39C12, #F1C40F);
    color: white; 
}
.btn-warning:hover { 
    background: linear-gradient(135deg, #E67E22, #F39C12);
}

.btn-danger { 
    background: linear-gradient(135deg, #E74C3C, #EC7063);
    color: white; 
}
.btn-danger:hover { 
    background: linear-gradient(135deg, #C0392B, #E74C3C);
}

.btn-info { 
    background: linear-gradient(135deg, #3498DB, #5DADE2);
    color: white; 
}
.btn-info:hover { 
    background: linear-gradient(135deg, #2E86C1, #3498DB);
}

.btn-sm { 
    padding: 6px 14px; 
    font-size: 13px; 
    border-radius: 6px;
}

.btn-outline {
    background: transparent;
    border: 1.5px solid var(--border);
    color: var(--text-light);
    box-shadow: none;
}
.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(30,90,168,0.05);
}

/* ========== 分页 ========== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-top: 24px;
    padding: 20px 0;
}

.pagination button {
    padding: 8px 14px;
    border: 1.5px solid var(--border);
    background: white;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
    min-width: 40px;
}

.pagination button:hover { 
    border-color: var(--primary); 
    color: var(--primary); 
    background: rgba(30,90,168,0.05);
    transform: translateY(-2px);
}

.pagination button.active { 
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white; 
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(30,90,168,0.3);
}

.pagination button:disabled { 
    opacity: 0.4; 
    cursor: not-allowed;
    transform: none;
}

.pagination span {
    font-size: 14px;
    color: var(--text-muted);
    padding: 0 8px;
}

/* ========== 模态框 ========== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(26,35,50,0.7);
    backdrop-filter: blur(4px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.3s ease;
}

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

.modal-overlay.show {
    display: flex;
}

.modal {
    background: white;
    border-radius: 16px;
    width: 580px;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 24px 80px rgba(0,0,0,0.4);
    animation: slideUp 0.3s ease;
    border: 1px solid var(--border);
}

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

.modal-header {
    padding: 20px 28px;
    border-bottom: 2px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(to right, rgba(30,90,168,0.03), transparent);
}

.modal-header h5 { 
    font-size: 18px;
    font-weight: 600;
    color: var(--text);
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-muted);
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

.modal-close:hover {
    background: rgba(231,76,60,0.1);
    color: var(--danger);
}

.modal-body {
    padding: 28px;
}

.modal-footer {
    padding: 20px 28px;
    border-top: 2px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    background: rgba(248,249,251,0.5);
}

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

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

.form-group label::after {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
    margin-left: 6px;
    vertical-align: middle;
    opacity: 0.6;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s;
    background: white;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(30,90,168,0.1);
    background: rgba(30,90,168,0.02);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

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

/* ========== 状态标签 ========== */
.tag {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.3px;
}

.tag-success { 
    background: rgba(39,174,96,0.1); 
    color: #27AE60;
    border: 1px solid rgba(39,174,96,0.2);
}
.tag-warning { 
    background: rgba(243,156,18,0.1); 
    color: #E67E22;
    border: 1px solid rgba(243,156,18,0.2);
}
.tag-danger { 
    background: rgba(231,76,60,0.1); 
    color: #E74C3C;
    border: 1px solid rgba(231,76,60,0.2);
}
.tag-info { 
    background: rgba(30,90,168,0.1); 
    color: #1E5AA8;
    border: 1px solid rgba(30,90,168,0.2);
}
.tag-default { 
    background: rgba(149,165,166,0.1); 
    color: #7F8C8D;
    border: 1px solid rgba(149,165,166,0.2);
}

/* ========== Toast 提示 ========== */
.toast-container {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 9999;
}

.toast {
    padding: 16px 24px;
    border-radius: 12px;
    color: white;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 12px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
    animation: slideIn 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 280px;
    backdrop-filter: blur(10px);
}

.toast::before {
    content: '';
    font-size: 18px;
}

.toast-success { 
    background: linear-gradient(135deg, rgba(39,174,96,0.95), rgba(46,204,113,0.95));
}
.toast-success::before { content: '✓'; }

.toast-error { 
    background: linear-gradient(135deg, rgba(231,76,60,0.95), rgba(236,112,99,0.95));
}
.toast-error::before { content: '✕'; }

.toast-warning { 
    background: linear-gradient(135deg, rgba(243,156,18,0.95), rgba(241,196,15,0.95));
}
.toast-warning::before { content: '⚠'; }

@keyframes slideIn {
    from { 
        transform: translateX(120%) scale(0.8);
        opacity: 0;
    }
    to { 
        transform: translateX(0) scale(1);
        opacity: 1;
    }
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .stat-cards { grid-template-columns: repeat(2, 1fr); }
    .sidebar { width: 70px; }
    .sidebar-header .logo-icon { width: 48px; height: 48px; font-size: 24px; }
    .sidebar-header h3, .sidebar-header p { display: none; }
    .sidebar-menu li a span:not(.icon) { display: none; }
    .sidebar-menu li a { justify-content: center; padding: 12px; }
    .main-content { margin-left: 70px; }
    .form-row { grid-template-columns: 1fr; }
    .topbar { padding: 0 16px; }
    .content { padding: 20px; }
}

/* ========== 空状态 ========== */
.empty-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-muted);
}

.empty-state .empty-icon {
    font-size: 64px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state p {
    font-size: 16px;
    color: var(--text-muted);
}

/* ========== 加载动画 ========== */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(30,90,168,0.2);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ========== 徽章 ========== */
.badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    padding: 0 6px;
    background: var(--danger);
    color: white;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 600;
    line-height: 1;
}

/* ========== 工具提示 ========== */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltip-text {
    visibility: hidden;
    background: rgba(26,35,50,0.95);
    color: white;
    text-align: center;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 12px;
    position: absolute;
    z-index: 1000;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.3s;
}

.tooltip:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}

/* ========== 欢迎横幅 ========== */
.welcome-banner {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 16px;
    padding: 32px 40px;
    margin-bottom: 28px;
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 8px 24px rgba(30,90,168,0.25);
    position: relative;
    overflow: hidden;
}

.welcome-banner::before {
    content: '📚';
    position: absolute;
    right: -20px;
    top: -20px;
    font-size: 180px;
    opacity: 0.1;
    transform: rotate(15deg);
}

.welcome-content h2 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 8px;
}

.welcome-content p {
    font-size: 15px;
    opacity: 0.9;
}

.welcome-time {
    font-size: 16px;
    font-weight: 500;
    background: rgba(255,255,255,0.15);
    padding: 12px 24px;
    border-radius: 10px;
    backdrop-filter: blur(10px);
}