:root {
    /* Updated Color Scheme - Professional Medical */
    --primary-blue: #4A90E2;
    --primary-blue-dark: #357ABD;
    --primary-blue-light: #E3F2FD;
    
    --secondary-green: #52c41a;
    --secondary-green-dark: #389e0d;
    --secondary-green-light: #f6ffed;
    
    /* Legacy purple variables - map to new blue for compatibility */
    --primary-purple: #4A90E2;
    --secondary-purple: #357ABD;
    
    /* Neutral Colors */
    --text-primary: #2C3E50;
    --text-secondary: #5A6C7D;
    --text-light: #8899A6;
    --border-color: #E1E8ED;
    --light-bg: #F7F9FC;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    
    scrollbar-gutter: stable;
}

html { overflow-y: scroll; }

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #FFFFFF;
    min-height: 100vh;
    opacity: 0;
    transition: opacity 0.25s ease;
    color: var(--text-primary);
}

body.loaded {
    opacity: 1;
}

/* === NAVBAR === */

.navbar-custom {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    padding: 8px 0;
    min-height: 58px;
    border-bottom: 1px solid var(--border-color);
}

.navbar-brand-header {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-blue) !important;
    text-decoration: none;
    transition: all 0.3s;
}

.navbar-brand-header:hover {
    color: var(--primary-blue-dark) !important;
}

.nav-link-header {
    color: var(--text-primary) !important;
    font-weight: 500;
    margin: 0 8px;
    padding: 8px 12px !important;
    position: relative;
    transition: all 0.25s;
    text-decoration: none;
}

.nav-link-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: all 0.25s;
    transform: translateX(-50%);
}

.nav-link-header:hover,
.nav-link-header.active {
    color: var(--primary-blue) !important;
}

.nav-link-header:hover::after,
.nav-link-header.active::after {
    width: 80%;
}

.btn-auth {
    padding: 8px 20px;
    border-radius: 6px;
    font-weight: 600;
    transition: all 0.25s;
    text-decoration: none;
    font-size: 0.8rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 35px;
}

.btn-login {
    background: var(--primary-blue);
    color: white !important;
    border: none;
}

.btn-login:hover {
    background: var(--primary-blue-dark);
    box-shadow: var(--shadow-sm);
}

.btn-register {
    background: transparent;
    color: var(--primary-blue) !important;
    border: 2px solid var(--primary-blue);
    margin-left: 10px;
}

.btn-register:hover {
    background: var(--primary-blue);
    color: white !important;
}

/* User Info */
.logout-header {
    display: none;
    align-items: center;
    gap: 15px;
}

.logout-header.active {
    display: flex;
}

.user-info-group {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.header-user-name {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
    max-width: 150px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-avatar {
    width: 38px;
    height: 38px;
    background: var(--primary-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 1rem;
}

.btn-logout-custom {
    background: var(--primary-blue);
    color: white;
    border: none;
    padding: 8px 20px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    transition: all 0.25s;
    display: flex;
    align-items: center;
    gap: 5px;
    height: 35px;
}

.btn-logout-custom:hover {
    background: var(--primary-blue-dark);
    box-shadow: var(--shadow-sm);
    color: white;
}

.nav-item-loggedin {
    display: none;
}

/* === NOTIFICATION BELL ICON === */
.notification-icon-wrapper {
    position: relative;
}

.notification-bell {
    background: none;
    border: none;
    color: var(--primary-blue);
    font-size: 1.3rem;
    cursor: pointer;
    padding: 5px 10px;
    position: relative;
    transition: all 0.25s;
}

.notification-bell:hover {
    color: var(--primary-blue-dark);
}

.notification-badge {
    position: absolute;
    top: 0;
    right: 5px;
    background: var(--secondary-green);
    color: white;
    font-size: 0.65rem;
    font-weight: 700;
    padding: 2px 5px;
    border-radius: 10px;
    min-width: 16px;
    text-align: center;
}

/* === NOTIFICATION PANEL (Slide from Right) === */
.notification-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1020;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
}

.notification-overlay.active {
    opacity: 1;
    visibility: visible;
}

.notification-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 450px;
    height: 100vh;
    background: white;
    box-shadow: -5px 0 30px rgba(0, 0, 0, 0.2);
    z-index: 1021;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
}

.notification-panel.active {
    transform: translateX(0);
}

.notification-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 25px;
    border-bottom: 1px solid var(--border-color);
    background: var(--primary-blue);
    color: white;
}

.notification-panel-header h4 {
    margin: 0;
    font-size: 1.2rem;
    font-weight: 700;
}

.notification-panel-actions {
    display: flex;
    gap: 10px;
}

.btn-mark-all-read,
.close-notification-panel {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 35px;
    height: 35px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.25s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-mark-all-read:hover,
.close-notification-panel:hover {
    background: rgba(255, 255, 255, 0.3);
}

.notification-panel-body {
    flex: 1;
    overflow-y: auto;
    padding: 15px;
}

.notification-panel-body::-webkit-scrollbar {
    width: 6px;
}

.notification-panel-body::-webkit-scrollbar-thumb {
    background: rgba(74, 144, 226, 0.3);
    border-radius: 3px;
}

/* Loading & Empty States */
.notification-loading,
.notification-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px;
    text-align: center;
}

.notification-empty i {
    font-size: 4rem;
    color: #ddd;
    margin-bottom: 15px;
}

.notification-empty p {
    color: var(--text-light);
    font-size: 1rem;
}

/* Notification Item */
.notification-item {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 12px;
    cursor: pointer;
    transition: all 0.25s;
    position: relative;
}

.notification-item:hover {
    box-shadow: var(--shadow-sm);
    transform: translateY(-2px);
}

.notification-item.unread {
    background: var(--primary-blue-light);
    border-left: 4px solid var(--primary-blue);
}

.notification-item.unread::before {
    content: '';
    position: absolute;
    top: 20px;
    right: 20px;
    width: 8px;
    height: 8px;
    background: var(--secondary-green);
    border-radius: 50%;
}

.notification-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.notification-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.notification-icon.type-lichkham {
    background: var(--primary-blue-light);
    color: var(--primary-blue);
}

.notification-icon.type-hethong {
    background: rgba(245, 158, 11, 0.15);
    color: #f59e0b;
}

.notification-title {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-primary);
    flex: 1;
}

.notification-time {
    font-size: 0.75rem;
    color: var(--text-light);
}

.notification-content {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-top: 8px;
}

.notification-content.collapsed {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* === MOBILE MENU === */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--primary-blue);
    cursor: pointer;
    padding: 5px;
}

.navbar-left {
    display: flex;
    align-items: center;
    gap: 15px;
}

.navbar-center {
    display: flex;
    margin: 0 auto;
}

.navbar-right {
    display: flex;
    align-items: center;
    margin-left: auto;
}

.mobile-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1021;
    opacity: 0;
    transition: opacity 0.3s;
}

.mobile-overlay.active {
    display: block;
    opacity: 1;
}

.mobile-sidebar {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    background: white;
    box-shadow: -5px 0 20px rgba(0, 0, 0, 0.1);
    z-index: 1021;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    overflow-y: auto;
    display: none;
}

.mobile-sidebar.active {
    transform: translateX(0);
}

.mobile-sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    background: var(--primary-blue);
    color: white;
}

.mobile-sidebar-header h4 {
    margin: 0;
    font-size: 1.2rem;
    font-weight: 700;
}

.close-sidebar {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 5px;
    transition: transform 0.2s;
}

.close-sidebar:hover {
    transform: scale(1.1);
}

.mobile-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.mobile-menu a {
    display: flex;
    align-items: center;
    padding: 15px 20px;
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.25s;
    border-left: 4px solid transparent;
}

.mobile-menu a:hover,
.mobile-menu a.active {
    background: var(--light-bg);
    border-left-color: var(--primary-blue);
    color: var(--primary-blue);
}

.mobile-menu a i {
    width: 25px;
    margin-right: 12px;
    font-size: 1.1rem;
}

.mobile-menu-loggedin {
    display: none;
}

.mobile-sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    background: var(--light-bg);
}

.mobile-auth-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.btn-mobile-login,
.btn-mobile-register {
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    transition: all 0.25s;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.btn-mobile-register {
    background: white;
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

.mobile-user-info {
    display: none;
}

.mobile-user-info.active {
    display: block;
}

.mobile-user-details {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 15px;
}

.mobile-user-details .user-avatar {
    width: 35px;
    height: 35px;
    font-size: 1.1rem;
}

.mobile-user-details .user-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.btn-mobile-logout {
    width: 100%;
    padding: 10px;
    background: var(--primary-blue);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* === Breadcrumb === */
.breadcrumb-section {
    background: white;
    padding: 4px 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 58px;
    z-index: 100;
}

.breadcrumb {
    margin: 0;
    padding: 0;
    background: transparent;
    font-size: 0.70rem;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
}

.breadcrumb-item a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.25s;
}

.breadcrumb-item a:hover {
    color: var(--primary-blue);
}

.breadcrumb-item.active {
    color: var(--primary-blue);
    font-weight: 600;
}

.breadcrumb-item + .breadcrumb-item::before {
    content: "›";
    color: var(--text-light);
    padding: 0 8px;
}

/* === FOOTER === */
.footer {
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    color: white;
    padding: 25px 0 10px;
    margin-top: 40px;
}

.footer-brand {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.footer-brand i {
    color: var(--primary-blue);
}

.footer-desc {
    color: #94a3b8;
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 20px;
}

.footer h5 {
    font-weight: 700;
    margin-bottom: 20px;
    color: white;
    position: relative;
    padding-bottom: 10px;
}

.footer h5::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--primary-blue);
    border-radius: 2px;
}

.footer-links {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: #94a3b8;
    text-decoration: none;
    transition: all 0.25s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.footer-links a:hover {
    color: white;
    padding-left: 5px;
}

.footer-contact p {
    color: #94a3b8;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-contact i {
    color: var(--primary-blue);
    width: 20px;
}

.social-icons {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.social-icons a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: all 0.25s;
}

.social-icons a:hover {
    background: var(--primary-blue);
    transform: translateY(-3px);
}

.copyright {
    text-align: center;
    padding-top: 25px;
    margin-top: 25px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #64748b;
    font-size: 0.9rem;
}

/* === SCROLL TO TOP === */
#scrollTopBtn {
    position: fixed;
    bottom: 25px;
    right: 25px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--primary-blue);
    color: white;
    border: none;
    font-size: 20px;
    display: none;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all 0.25s;
    z-index: 999;
}

#scrollTopBtn:hover {
    background: var(--primary-blue-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* === RESPONSIVE === */
@media (max-width: 992px) {
    .navbar-center {
        display: none;
    }
    
    .menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.6rem;
        padding: 5px 0 5px 10px;
    }
    
    .mobile-sidebar {
        display: block;
    }

    .notification-panel {
        width: 350px;
    }
}

@media (max-width: 768px) {
    .navbar-right .auth-buttons,
    .navbar-right .logout-header {
        display: none !important;
    }
    
    .mobile-sidebar {
        width: 70%;
        max-width: 320px;
    }
    
    .navbar-custom {
        padding: 8px 0;
    }
    
    .navbar-brand-header {
        font-size: 1.2rem;
    }

    .notification-panel {
        width: 60%;
    }
    
    .notification-bell {
        font-size: 1.4rem;
        padding: 5px;
    }
}