/* 全局样式设置 - 优雅的极简主义美学 */
:root {
    --primary-color: #4a90e2;
    --secondary-color: #7b68ee;
    --accent-color: #50c878;
    --background-gradient-start: #f8fafc;
    --background-gradient-end: #e9ecef;
    --card-bg: rgba(255, 255, 255, 0.92);
    --card-shadow: 0 6px 20px rgba(31, 38, 135, 0.08);
    --text-primary: #2c3e50;
    --text-secondary: #6c757d;
    --border-radius: 18px;
    --transition: all 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    --spacing-unit: 20px;
}

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

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
    background: linear-gradient(135deg, var(--background-gradient-start), var(--background-gradient-end));
    min-height: 100vh;
    padding: 20px;
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

/* 精心打磨的头部样式 */
.header {
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    padding: var(--spacing-unit);
    opacity: 0.9;
}

.header h1 {
    font-size: 2.3rem;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 600;
    letter-spacing: -0.5px;
}

.header p {
    color: var(--text-secondary);
    font-size: 1rem;
    opacity: 0.8;
}

/* 轻盈通透的卡片样式 */
.card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: calc(var(--spacing-unit) * 1.25);
    margin-bottom: var(--spacing-unit);
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.25);
    transition: var(--transition);
    transform: translateZ(0);
}

.card:hover {
    transform: translateY(-4px) translateZ(0);
    box-shadow: 0 10px 30px rgba(31, 38, 135, 0.15);
}

/* 精致的表单样式 */
.form-group {
    margin-bottom: calc(var(--spacing-unit) * 0.75);
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 13px 16px;
    border: 1px solid rgba(74, 144, 226, 0.2);
    border-radius: 12px;
    font-size: 1rem;
    transition: var(--transition);
    background: rgba(255, 255, 255, 0.7);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: rgba(74, 144, 226, 0.6);
    box-shadow: 0 0 0 4px rgba(74, 144, 226, 0.15);
    background: rgba(255, 255, 255, 0.9);
}

/* 细腻的按钮微交互 */
.btn {
    display: inline-block;
    padding: 13px 26px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: 14px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: var(--transition);
    text-decoration: none;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(74, 144, 226, 0.25);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
    transition: 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(74, 144, 226, 0.4);
}

.btn:active {
    transform: translateY(-1px);
}

.btn-block {
    display: block;
    width: 100%;
}

.btn-secondary {
    background: linear-gradient(135deg, #95a5a6, #7f8c8d);
    box-shadow: 0 4px 12px rgba(149, 165, 166, 0.25);
}

.btn-secondary:hover {
    box-shadow: 0 8px 20px rgba(149, 165, 166, 0.4);
}

.btn-success {
    background: linear-gradient(135deg, var(--accent-color), #3498db);
    box-shadow: 0 4px 12px rgba(80, 200, 120, 0.25);
}

.btn-success:hover {
    box-shadow: 0 8px 20px rgba(80, 200, 120, 0.4);
}

/* 精美的导航栏 */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.4);
}

.nav-links {
    display: flex;
    gap: 16px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-primary);
    padding: 10px 16px;
    border-radius: 12px;
    transition: var(--transition);
    font-size: 0.95rem;
    background: rgba(255, 255, 255, 0.4);
}

.nav-links a:hover {
    background: rgba(74, 144, 226, 0.12);
    transform: translateY(-1px);
}

/* 优雅的角色切换 */
.role-switch {
    background: rgba(74, 144, 226, 0.08);
    padding: 8px;
    border-radius: 22px;
    display: flex;
    margin-bottom: var(--spacing-unit);
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
}

.role-switch span {
    font-size: 0.95rem;
    color: var(--text-primary);
    font-weight: 500;
}

.role-btn {
    padding: 10px 18px;
    border: none;
    background: none;
    cursor: pointer;
    border-radius: 18px;
    transition: var(--transition);
    font-size: 0.9rem;
    font-weight: 500;
}

.role-btn.active {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 12px rgba(74, 144, 226, 0.3);
}

.role-btn:hover:not(.active) {
    background: rgba(74, 144, 226, 0.15);
}

/* 登出按钮 */
.btn-logout {
    display: inline-block;
    padding: 10px 18px;
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: white;
    text-decoration: none;
    border-radius: 14px;
    transition: var(--transition);
    font-size: 0.9rem;
    box-shadow: 0 4px 12px rgba(231, 76, 60, 0.25);
}

.btn-logout:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(231, 76, 60, 0.4);
}

/* 签到按钮 */
.btn-checkin {
    display: inline-block;
    padding: 11px 22px;
    background: linear-gradient(135deg, var(--accent-color), #3498db);
    color: white;
    text-decoration: none;
    border-radius: 14px;
    transition: var(--transition);
    font-size: 0.95rem;
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.25);
}

.btn-checkin:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(52, 152, 219, 0.4);
}

/* 学生按钮 */
.btn-student {
    display: inline-block;
    padding: 12px 26px;
    background: linear-gradient(135deg, #9b59b6, #3498db);
    color: white;
    text-decoration: none;
    border-radius: 14px;
    transition: var(--transition);
    margin: 0 8px;
    box-shadow: 0 4px 12px rgba(155, 89, 182, 0.25);
}

.btn-student:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(155, 89, 182, 0.4);
}

/* 管理员按钮 */
.btn-admin {
    display: inline-block;
    padding: 11px 22px;
    background: linear-gradient(135deg, #e67e22, #f39c12);
    color: white;
    text-decoration: none;
    border-radius: 14px;
    transition: var(--transition);
    margin: 0 4px;
    box-shadow: 0 4px 12px rgba(230, 126, 34, 0.25);
}

.btn-admin:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(230, 126, 34, 0.4);
}

/* 返回按钮 */
.btn-back {
    display: inline-block;
    padding: 10px 18px;
    background: linear-gradient(135deg, #95a5a6, #7f8c8d);
    color: white;
    text-decoration: none;
    border-radius: 14px;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(149, 165, 166, 0.25);
}

.btn-back:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(149, 165, 166, 0.4);
}

/* 微信扫码按钮 */
.btn-wechat-scan {
    display: inline-block;
    padding: 12px 26px;
    background: linear-gradient(135deg, #00c853, #4caf50);
    color: white;
    border: none;
    border-radius: 14px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: var(--transition);
    margin: 0 8px;
    box-shadow: 0 4px 12px rgba(0, 200, 83, 0.25);
}

.btn-wechat-scan:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 200, 83, 0.4);
}

/* 签到卡片 */
.checkin-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    border-radius: 14px;
    margin-bottom: 12px;
    background: var(--card-bg);
    box-shadow: 0 3px 10px rgba(0,0,0,0.05);
    transition: var(--transition);
}

.checkin-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.checkin-status {
    display: flex;
    align-items: center;
    gap: 10px;
}

.status-indicator {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    display: inline-block;
}

.status-present {
    background-color: var(--accent-color);
}

.status-absent {
    background-color: #e74c3c;
}

.status-pending {
    background-color: #f39c12;
}

/* 时间线样式 */
.timeline {
    position: relative;
    padding-left: 35px;
    margin-left: 12px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 3px;
    background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    margin-bottom: 24px;
    padding-left: 24px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -38px;
    top: 6px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    border: 3px solid white;
    box-shadow: 0 0 0 3px var(--primary-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 16px;
        align-items: stretch;
    }
    
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 12px;
    }
    
    .nav-links a {
        flex: 1;
        text-align: center;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .card {
        padding: var(--spacing-unit);
    }
    
    .checkin-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .role-switch {
        flex-direction: column;
        align-items: stretch;
    }
    
    .role-switch span {
        text-align: center;
        margin-bottom: 8px;
    }
}

/* 二维码样式 */
.qr-container {
    text-align: center;
    padding: var(--spacing-unit);
}

.qr-code {
    width: 220px;
    height: 220px;
    margin: 0 auto var(--spacing-unit);
    background: white;
    padding: 18px;
    border-radius: 16px;
    box-shadow: var(--card-shadow);
}

/* 统计卡片 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: calc(var(--spacing-unit) * 0.8);
    margin-bottom: calc(var(--spacing-unit) * 1.2);
}

.stat-card {
    background: var(--card-bg);
    padding: calc(var(--spacing-unit) * 0.9);
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(31, 38, 135, 0.12);
}

.stat-number {
    font-size: 2.3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.stat-label {
    color: var(--text-secondary);
    margin-top: 6px;
    font-size: 0.95rem;
}

/* 表格样式 */
table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-unit) 0;
    border-radius: 12px;
    overflow: hidden;
}

th, td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

th {
    background: rgba(74, 144, 226, 0.08);
    font-weight: 600;
    color: var(--text-primary);
}

tr:hover {
    background: rgba(74, 144, 226, 0.05);
}

/* 消息提示 */
.message {
    padding: 16px;
    border-radius: 14px;
    margin-bottom: var(--spacing-unit);
    font-size: 0.95rem;
}

.message.success {
    background: rgba(46, 204, 113, 0.15);
    border: 1px solid rgba(46, 204, 113, 0.25);
    color: #27ae60;
}

.message.error {
    background: rgba(231, 76, 60, 0.15);
    border: 1px solid rgba(231, 76, 60, 0.25);
    color: #c0392b;
}

.message.info {
    background: rgba(52, 152, 219, 0.15);
    border: 1px solid rgba(52, 152, 219, 0.25);
    color: #2980b9;
}

/* 考勤管理样式 */
.attendance-stats {
    display: flex;
    gap: var(--spacing-unit);
    margin-bottom: var(--spacing-unit);
    flex-wrap: wrap;
}

.attendance-lists {
    display: flex;
    gap: var(--spacing-unit);
    flex-wrap: wrap;
}

.attendance-list {
    flex: 1;
    min-width: 320px;
}

.attendance-list h3 {
    margin-top: 0;
    margin-bottom: 16px;
    color: var(--primary-color);
    font-size: 1.2rem;
    border-bottom: 1px solid rgba(74, 144, 226, 0.15);
    padding-bottom: 10px;
}

.attendance-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px;
    margin-bottom: 8px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.attendance-item:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateX(4px);
}

.attendance-item.checked-in {
    background: rgba(80, 200, 120, 0.12);
    border-left: 4px solid var(--accent-color);
}

.attendance-item.not-checked-in {
    background: rgba(231, 76, 60, 0.12);
    border-left: 4px solid #e74c3c;
}

.user-name {
    font-weight: 500;
    font-size: 1rem;
}

.checkin-time {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-right: 10px;
}

/* 新增样式：管理员功能区 */
.admin-functions {
    margin-top: var(--spacing-unit);
}

.admin-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: calc(var(--spacing-unit) * 1.1);
    margin-bottom: var(--spacing-unit);
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.25);
    transition: var(--transition);
}

.admin-card h3 {
    margin-top: 0;
    margin-bottom: calc(var(--spacing-unit) * 0.75);
    color: var(--primary-color);
    font-size: 1.3rem;
    border-bottom: 1px solid rgba(74, 144, 226, 0.15);
    padding-bottom: 12px;
}

.admin-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: calc(var(--spacing-unit) * 0.75);
    justify-content: center;
}

/* 快速签到卡片 */
.quick-checkin-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: calc(var(--spacing-unit) * 1.1);
    margin-bottom: var(--spacing-unit);
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.25);
    transition: var(--transition);
}

.quick-checkin-card h3 {
    margin-top: 0;
    margin-bottom: calc(var(--spacing-unit) * 0.75);
    color: var(--primary-color);
    font-size: 1.2rem;
}

.quick-checkin-content {
    display: flex;
    flex-wrap: wrap;
    gap: calc(var(--spacing-unit) * 0.75);
    align-items: center;
}

.quick-checkin-content .form-control {
    flex: 1;
    min-width: 220px;
}

.quick-checkin-content .btn-checkin {
    margin-top: calc(var(--spacing-unit) * 0.25 + 12px);
}

/* 学生功能区 */
.student-functions {
    margin-top: var(--spacing-unit);
}

.checkin-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-unit);
}

.available-groups, .active-scans {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: calc(var(--spacing-unit) * 1.1);
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.25);
}

.groups-list, .scans-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: calc(var(--spacing-unit) * 0.75);
    margin-top: calc(var(--spacing-unit) * 0.75);
}

.group-item, .scan-item {
    background: white;
    padding: calc(var(--spacing-unit) * 0.8);
    border-radius: 12px;
    box-shadow: 0 3px 12px rgba(0,0,0,0.06);
    transition: var(--transition);
}

.group-item:hover, .scan-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 18px rgba(0,0,0,0.1);
}

.group-item h4, .scan-item h4 {
    margin: 0 0 10px 0;
    color: var(--primary-color);
    font-size: 1.1rem;
}

.group-item p, .scan-item p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

.scan-actions {
    margin-top: 12px;
    text-align: right;
}

.student-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: calc(var(--spacing-unit) * 0.75);
    margin-top: calc(var(--spacing-unit) * 1.1);
}

/* 切换角色按钮 */
.btn-switch-role {
    display: inline-block;
    padding: 10px 18px;
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    border: none;
    border-radius: 14px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.25);
}

.btn-switch-role:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(52, 152, 219, 0.4);
}

/* 时间线头部 */
.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-unit);
}

.header-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

/* 统计项目 */
.stat-item {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: calc(var(--spacing-unit) * 0.85);
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.25);
    transition: var(--transition);
}

.stat-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(31, 38, 135, 0.12);
}

.stat-info p {
    margin: 7px 0;
    font-size: 0.95rem;
}

/* 新增：学生考勤概览样式 */
.attendance-overview {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.attendance-day-card {
    background: var(--card-bg);
    border-radius: 14px;
    padding: 16px;
    box-shadow: var(--card-shadow);
    border: 1px solid rgba(255, 255, 255, 0.25);
    transition: var(--transition);
}

.attendance-day-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(31, 38, 135, 0.12);
}

.day-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid rgba(74, 144, 226, 0.1);
}

.day-header h4 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.date-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-left: 8px;
}

.group-label {
    background: rgba(74, 144, 226, 0.1);
    color: var(--primary-color);
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.85rem;
}

.attendance-session {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 12px;
}

.session-item {
    flex: 1;
    min-width: 200px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.6);
    transition: var(--transition);
}

.session-item.attended {
    background: rgba(80, 200, 120, 0.1);
    border-left: 3px solid var(--accent-color);
}

.session-item.absent {
    background: rgba(231, 76, 60, 0.08);
    border-left: 3px solid #e74c3c;
}

.session-time {
    font-weight: 500;
    color: var(--text-primary);
}

.session-status {
    font-size: 0.9rem;
}

.status-badge {
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
}

.status-badge.success {
    background: rgba(80, 200, 120, 0.2);
    color: #27ae60;
}

.status-badge.absent {
    background: rgba(231, 76, 60, 0.2);
    color: #c0392b;
}

/* 新增：活跃签到和今日签到记录样式 */
.active-checkins-card,
.today-checkins-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: calc(var(--spacing-unit) * 1.1);
    margin-bottom: var(--spacing-unit);
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.25);
    transition: var(--transition);
}

.active-checkins-card h3,
.today-checkins-card h3 {
    margin-top: 0;
    margin-bottom: calc(var(--spacing-unit) * 0.75);
    color: var(--primary-color);
    font-size: 1.2rem;
    border-bottom: 1px solid rgba(74, 144, 226, 0.15);
    padding-bottom: 12px;
}

.time-period-section {
    margin-bottom: calc(var(--spacing-unit) * 0.75);
}

.time-period-section h4 {
    margin: 0 0 12px 0;
    color: var(--secondary-color);
    font-size: 1.1rem;
    padding-bottom: 6px;
    border-bottom: 1px dashed rgba(123, 104, 238, 0.2);
}

.active-scan-item,
.today-scan-item {
    background: white;
    padding: calc(var(--spacing-unit) * 0.7);
    margin-bottom: 10px;
    border-radius: 12px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.06);
    transition: var(--transition);
    border-left: 4px solid var(--primary-color);
}

.active-scan-item:hover,
.today-scan-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.active-scan-item p,
.today-scan-item p {
    margin: 6px 0;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.active-scan-item p:last-child,
.today-scan-item p:last-child {
    margin-bottom: 0;
}

.active-scan-item p a,
.today-scan-item p a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.active-scan-item p a:hover,
.today-scan-item p a:hover {
    text-decoration: underline;
}

.active-scan-item {
    border-left-color: var(--accent-color);
}

.today-scan-item {
    border-left-color: var(--secondary-color);
}

.today-scan-item .status-badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-top: 4px;
}

.today-scan-item .status-badge.success {
    background: rgba(80, 200, 120, 0.2);
    color: #27ae60;
}

.today-scan-item .status-badge.pending {
    background: rgba(243, 156, 18, 0.2);
    color: #d35400;
}

@media (max-width: 768px) {
    .time-period-section {
        margin-bottom: calc(var(--spacing-unit) * 0.5);
    }
    
    .active-scan-item,
    .today-scan-item {
        padding: calc(var(--spacing-unit) * 0.5);
    }
    
    .active-checkins-card h3,
    .today-checkins-card h3 {
        font-size: 1.1rem;
    }
    
    .attendance-stats {
        flex-direction: column;
    }
    
    .attendance-lists {
        flex-direction: column;
    }
    
    .attendance-list {
        min-width: 100%;
    }
    
    .quick-checkin-content {
        flex-direction: column;
        align-items: stretch;
    }
    
    .quick-checkin-content .form-control {
        min-width: 100%;
    }
    
    .quick-checkin-content .btn-checkin {
        margin-top: 0;
    }
    
    .admin-buttons {
        flex-direction: column;
    }
    
    .admin-buttons .btn-admin {
        width: 100%;
    }
    
    .student-buttons {
        flex-direction: column;
    }
    
    .timeline-header {
        flex-direction: column;
        gap: calc(var(--spacing-unit) * 0.75);
        align-items: stretch;
    }
    
    .header-actions {
        justify-content: center;
    }
    
    .day-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    
    .attendance-session {
        flex-direction: column;
    }
    
    .session-item {
        min-width: 100%;
    }
    
    :root {
        --spacing-unit: 16px;
    }
}