:root {
    --primary: #3A98B9;
    --primary-light: #5FB0D1;
    --primary-dark: #2A7A9B;
    --secondary: #FF6D28;
    --accent: #FFB830;
    --text: #333333;
    --text-light: #6B7280;
    --text-lighter: #9CA3AF;
    --bg: #F8FAFC;
    --card-bg: #FFFFFF;
    --border: #E5E7EB;
    --success: #10B981;
    --warning: #F59E0B;
    --error: #EF4444;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition: all 0.2s ease;
    --github-bg: #f6f8fa;
    --github-border: #d0d7de;
    --github-header-bg: #f6f8fa;
    --sidebar-width: 280px;
    --sidebar-collapsed-width: 80px;
    --notification: #FF4D4F;
}

[data-theme="dark"] {
    --primary: #4AB1D1;
    --primary-light: #6BC1E1;
    --primary-dark: #3A98B9;
    --secondary: #FF8C42;
    --accent: #FFC154;
    --text: #F3F4F6;
    --text-light: #D1D5DB;
    --text-lighter: #9CA3AF;
    --bg: #1F2937;
    --card-bg: #374151;
    --border: #4B5563;
    --github-bg: #161b22;
    --github-border: #30363d;
    --github-header-bg: #161b22;
    --notification: #FF6B6B;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    transition: var(--transition);
    line-height: 1.5;
}

.app-container {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    grid-template-rows: 80px 1fr;
    min-height: 100vh;
}

.header {
    grid-column: 2 / 3;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    background-color: var(--card-bg);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.header-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary);
    transition: var(--transition);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    position: relative;
}

.header-icon {
    font-size: 1.25rem;
    color: var(--text-light);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.header-icon:hover {
    color: var(--primary);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    z-index: 101;
}

.user-avatar:hover {
    transform: scale(1.05);
    box-shadow: 0 0 0 3px rgba(58, 152, 185, 0.2);
}

/* Dropdown Menu Styles - FIXED */
.avatar-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 0.5rem;
    background-color: var(--card-bg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
    width: 260px;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    overflow: hidden;
}

.avatar-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-header {
    padding: 1.25rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background-color: var(--card-bg);
}

.dropdown-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
}

.dropdown-user-info {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 0;
}

.dropdown-username {
    font-weight: 600;
    color: var(--text);
    font-size: 0.95rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.dropdown-email {
    font-size: 0.8rem;
    color: var(--text-light);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-top: 0.25rem;
}

.dropdown-menu {
    padding: 0.5rem 0;
    background-color: var(--card-bg);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.25rem;
    color: var(--text);
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.9rem;
    border: none;
    background: none;
    width: 100%;
    cursor: pointer;
    text-align: left;
}

.dropdown-item:hover {
    background-color: rgba(58, 152, 185, 0.1);
}

.dropdown-item i {
    width: 18px;
    text-align: center;
    color: var(--text-light);
    font-size: 0.9rem;
    flex-shrink: 0;
}

.dropdown-divider {
    height: 1px;
    background-color: var(--border);
    margin: 0.5rem 0;
}

.avatar-link {
    text-decoration: none;
    color: inherit;
}

.sidebar {
    grid-column: 1 / 2;
    grid-row: 1 / 3;
    background-color: var(--card-bg);
    border-right: 1px solid var(--border);
    padding: 1.5rem 0;
    display: flex;
    flex-direction: column;
    height: 100vh;
    position: sticky;
    top: 0;
    transition: var(--transition);
    overflow-x: hidden;
    width: var(--sidebar-width);
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
}

.sidebar-header {
    padding: 0 1.5rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 1.5rem;
    transition: var(--transition);
    min-height: 68px;
}

.sidebar.collapsed .sidebar-header {
    justify-content: center;
    padding: 0 0.5rem 1.5rem;
}

.sidebar-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background-color: var(--primary);
    border-radius: var(--radius-sm);
    padding: 4px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    min-width: 40px;
}

.sidebar-logo:hover {
    box-shadow: var(--shadow-md);
}

.sidebar-logo img {
    height: 100%;
    width: auto;
    object-fit: contain;
    filter: brightness(0) invert(1);
}

.sidebar-title-container {
    transition: var(--transition);
    overflow: hidden;
    white-space: nowrap;
}

.sidebar.collapsed .sidebar-title-container {
    opacity: 0;
    width: 0;
}

.sidebar-title {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
}

.sidebar-group {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: 0.25rem;
    line-height: 1.2;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 0 1rem;
    transition: var(--transition);
}

.sidebar.collapsed .sidebar-nav {
    padding: 0 0.5rem;
}

.nav-item {
    position: relative;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    margin-bottom: 0.5rem;
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition);
    overflow: hidden;
}

.sidebar.collapsed .nav-item {
    padding: 0.75rem;
    justify-content: center;
}

.nav-item:hover {
    background-color: rgba(0, 119, 255, 0.2);
    border-left: 4px solid #0077ff;
}

.nav-item::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 2px;
    background-color: #0077ff;
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s ease;
}

.nav-item:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.nav-item.active {
    background-color: rgba(58, 152, 185, 0.1);
    color: var(--primary);
    font-weight: 500;
}

.nav-item.hidden {
    display: none !important;
}

.nav-icon {
    font-size: 1.1rem;
    margin-right: 0.75rem;
    width: 24px;
    text-align: center;
    transition: var(--transition);
}

.sidebar.collapsed .nav-icon {
    margin-right: 0;
}

.nav-text {
    font-size: 0.95rem;
    transition: var(--transition);
    overflow: hidden;
}

.sidebar.collapsed .nav-text {
    opacity: 0;
    width: 0;
    height: 0;
}

/* Khi sidebar thu gọn */
.sidebar.collapsed .nav-item {
    flex-direction: column;
    /* icon trên, text dưới */
    justify-content: center;
    padding: 0.75rem 0;
    text-align: center;
}

/* Icon căn giữa */
.sidebar.collapsed .nav-icon {
    margin: 0 0 4px 0;
    /* cách text 1 chút */
}

/* Text hiển thị dưới icon */
.sidebar.collapsed .nav-text {
    opacity: 1;
    width: auto;
    height: auto;
    font-size: 0.8rem;
    /* chữ nhỏ gọn hơn */
    white-space: nowrap;
}

.sidebar-footer {
    padding: 1.5rem;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.sidebar.collapsed .sidebar-footer {
    padding: 1.5rem 0.5rem;
}

ul,
ol {
    color: var(--text);
}

li {
    line-height: 1.6;
    color: var(--text);
}

ul {
    list-style-type: disc;
}

ol {
    list-style-type: decimal;
}

ul li::marker {
    color: var(--primary-light);
}

[data-theme="dark"] ul li::marker {
    color: var(--accent);
}

.list-horizontal {
    display: flex;
    gap: 1rem;
    padding-left: 0;
    list-style: none;
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: rgba(0, 0, 0, 0.05);
    border-radius: 50px;
    padding: 0.25rem;
    cursor: pointer;
    transition: var(--transition);
}

[data-theme="dark"] .theme-toggle {
    background-color: rgba(255, 255, 255, 0.05);
}

.theme-btn {
    width: 50%;
    padding: 0.5rem;
    border-radius: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    transition: var(--transition);
}

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

.main-content {
    grid-column: 2 / 3;
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    color: var(--text-light);
    cursor: pointer;
    margin-right: 1rem;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background-color: rgba(58, 152, 185, 0.1);
    transition: var(--transition);
}

.mobile-menu-btn:hover {
    background-color: rgba(58, 152, 185, 0.2);
}

.toggle-sidebar {
    position: fixed;
    top: 1rem;
    left: 260px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 999;
    transition: var(--transition);
}

.toggle-sidebar:hover {
    background-color: var(--primary);
    color: white;
}

.toggle-sidebar i {
    font-size: 0.8rem;
    transition: var(--transition);
}

.sidebar.collapsed .toggle-sidebar i {
    transform: rotate(180deg);
}

.sidebar.collapsed~.toggle-sidebar {
    left: 60px;
}

/* Social Media Icons Styles - IMPROVED */
.social-media-section {
    margin-top: 0;
    padding: 1rem 0 0;
    transition: var(--transition);
    border-top: 1px solid var(--border);
}

.sidebar.collapsed .social-media-section {
    padding: 0.5rem 0 0;
}

.social-media-title {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 0.75rem;
    text-align: center;
    font-weight: 500;
    transition: var(--transition);
    overflow: hidden;
    white-space: nowrap;
}

.sidebar.collapsed .social-media-title {
    opacity: 0;
    height: 0;
    margin-bottom: 0;
}

.social-icons {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.sidebar.collapsed .social-icons {
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background-color: rgba(0, 0, 0, 0.05);
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
}

[data-theme="dark"] .social-icon {
    background-color: rgba(255, 255, 255, 0.05);
}

.social-icon:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.social-icon.facebook:hover {
    background-color: #1877F2;
    color: white;
}

.social-icon.youtube:hover {
    background-color: #FF0000;
    color: white;
}

.social-icon.github:hover {
    background-color: #333;
    color: white;
}

.social-icon.linkedin:hover {
    background-color: #0A66C2;
    color: white;
}

.social-icon.twitter:hover {
    background-color: #1DA1F2;
    color: white;
}

.social-icon .tooltip {
    position: absolute;
    bottom: -30px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--card-bg);
    color: var(--text);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    z-index: 10;
}

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

.sidebar.collapsed .social-icon .tooltip {
    left: 100%;
    bottom: 50%;
    transform: translateY(50%);
    margin-left: 8px;
}

/* Ẩn social media và theme toggle khi sidebar thu gọn trên desktop */
@media (min-width: 1025px) {

    .sidebar.collapsed .social-media-section,
    .sidebar.collapsed .sidebar-footer {
        display: none;
    }
}

@media (max-width: 1024px) {
    .app-container {
        grid-template-columns: var(--sidebar-collapsed-width) 1fr;
    }

    .sidebar {
        width: var(--sidebar-collapsed-width);
    }

    .sidebar-header {
        justify-content: center;
        padding: 0 0.5rem 1.5rem;
    }

    .sidebar-nav {
        padding: 0 0.5rem;
    }

    .nav-item {
        padding: 0.75rem;
        justify-content: center;
    }

    .nav-icon {
        margin-right: 0;
    }

    .nav-text {
        opacity: 0;
        width: 0;
        height: 0;
    }

    .sidebar-footer {
        padding: 1.5rem 0.5rem;
    }

    .toggle-sidebar i {
        transform: rotate(180deg);
    }

    .header {
        grid-column: 2 / 3;
    }

    .social-media-title {
        display: none;
    }

    .social-icons {
        flex-direction: column;
        align-items: center;
        gap: 0.5rem;
    }
}

/* Chỉ hiển thị trên màn hình nhỏ (tablet & mobile) */
@media (max-width: 1024px) {
    .app-container {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto 1fr;
    }

    .header {
        grid-column: 1 / 2;
        padding: 1rem;
    }

    .sidebar {
        grid-column: 1 / 2;
        grid-row: 2 / 3;
        height: auto;
        position: static;
        display: none;
        width: 100%;
        flex-direction: column;
        padding: 1rem;
    }

    .sidebar.active {
        display: flex;
    }

    .sidebar-header {
        display: flex;
        padding: 0 0 1rem;
        border-bottom: 1px solid var(--border);
        margin-bottom: 1rem;
    }

    .sidebar-nav {
        display: flex;
        flex-direction: column;
        padding: 0;
        width: 100%;
    }

    .nav-item {
        padding: 0.75rem 1rem;
        justify-content: flex-start;
        width: 100%;
        margin-bottom: 0.25rem;
    }

    .nav-icon {
        margin-right: 0.75rem;
        display: inline-block;
    }

    .nav-text {
        opacity: 1;
        width: auto;
        height: auto;
        font-size: 0.95rem;
    }

    .sidebar-footer {
        display: block;
        padding: 1rem 0 0;
        margin-top: 1rem;
        border-top: 1px solid var(--border);
    }

    .toggle-sidebar {
        display: none;
    }

    .main-content {
        grid-column: 1 / 2;
        grid-row: 3 / 4;
        padding: 1.5rem;
    }

    .mobile-menu-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        border-radius: var(--radius-sm);
        background-color: rgba(58, 152, 185, 0.1);
        color: var(--primary);
        font-size: 1.25rem;
        cursor: pointer;
        transition: var(--transition);
    }

    .mobile-menu-btn:hover {
        background-color: rgba(58, 152, 185, 0.2);
    }

    .social-media-section {
        margin-top: 1rem;
        padding-top: 1rem;
    }

    .social-media-title {
        display: block;
        text-align: center;
        margin-bottom: 0.75rem;
    }

    .social-icons {
        flex-direction: row;
        justify-content: center;
        gap: 0.75rem;
    }

    /* Avatar dropdown on mobile */
    .avatar-dropdown {
        width: 240px;
        right: 1rem;
    }
}

@media (max-width: 480px) {
    .header-title {
        font-size: 1.25rem;
    }

    .header-actions {
        gap: 1rem;
    }

    .nav-item {
        padding: 0.75rem 1rem;
    }

    .social-icons {
        gap: 0.5rem;
    }

    .avatar-dropdown {
        width: 220px;
        right: 0.5rem;
    }

    .dropdown-header {
        padding: 1rem;
    }

    .dropdown-item {
        padding: 0.75rem 1rem;
    }
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        border-radius: var(--radius-sm);
        background-color: rgba(58, 152, 185, 0.1);
        color: var(--primary);
        font-size: 1.25rem;
        cursor: pointer;
        transition: var(--transition);
    }

    .mobile-menu-btn:hover {
        background-color: rgba(58, 152, 185, 0.2);
    }
}

.hidden {
    display: none !important;
}
/* Thêm style cho notification badge */
.notification-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    width: 16px;
    height: 16px;
    background: linear-gradient(135deg, #FF4D4F 0%, #FF6B6B 100%);
    border-radius: 50%;
    border: 3px solid var(--card-bg);
    z-index: 102;
    animation: pulse-glow 1.5s ease-in-out infinite alternate;
    box-shadow: 
        0 0 0 2px rgba(255, 77, 79, 0.3),
        0 4px 12px rgba(255, 77, 79, 0.4);
    display: none;
}
/* Hiệu ứng nhấp nháy nổi bật */
@keyframes pulse-glow {
    0% {
        transform: scale(1);
        box-shadow: 
            0 0 0 2px rgba(255, 77, 79, 0.3),
            0 4px 12px rgba(255, 77, 79, 0.4);
        background: linear-gradient(135deg, #FF4D4F 0%, #FF6B6B 100%);
    }
    50% {
        transform: scale(1.15);
        box-shadow: 
            0 0 0 4px rgba(255, 77, 79, 0.5),
            0 6px 20px rgba(255, 77, 79, 0.6);
        background: linear-gradient(135deg, #FF3333 0%, #FF5252 100%);
    }
    100% {
        transform: scale(1.1);
        box-shadow: 
            0 0 0 3px rgba(255, 77, 79, 0.4),
            0 5px 15px rgba(255, 77, 79, 0.5);
        background: linear-gradient(135deg, #FF4D4F 0%, #FF6B6B 100%);
    }
}
/* Thêm hiệu ứng "bounce" nhẹ */
@keyframes bounce-pulse {
    0%, 100% {
        transform: translateY(0) scale(1);
    }
    25% {
        transform: translateY(-2px) scale(1.1);
    }
    50% {
        transform: translateY(0) scale(1.15);
    }
    75% {
        transform: translateY(-1px) scale(1.1);
    }
}

@keyframes pulse {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(255, 77, 79, 0.7);
    }
    70% {
        transform: scale(1.1);
        box-shadow: 0 0 0 5px rgba(255, 77, 79, 0);
    }
    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(255, 77, 79, 0);
    }
}
.header-icon.theme-icon {
    display: none;
}