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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

/* Navigation */
.navbar {
    background-color: #0072BC;
    color: white;
    font-family: Arial, sans-serif;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo a {
    color: white;
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: background-color 0.3s;
}

.nav-link:hover {
    background-color: rgba(255,255,255,0.1);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: white;
    margin: 3px 0;
    transition: 0.3s;
}

/* Main Content */
.main-content {
    min-height: calc(100vh - 140px);
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Hero Section */
.hero-section {
    text-align: center;
    padding: 2rem 1rem;
    background-color: #0072BC;
    color: white;
    font-family: Arial, sans-serif;
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
    animation: heroGlow 4s ease-in-out infinite alternate;
}

/* Hiệu ứng glow cho hero section */
@keyframes heroGlow {
    0% {
        box-shadow: inset 0 0 20px rgba(255, 255, 255, 0.1);
    }
    100% {
        box-shadow: inset 0 0 40px rgba(255, 255, 255, 0.2);
    }
}

/* Floating particles với hạt sáng to hơn và thêm màu #0072BC */
.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.2) 4px, transparent 4px),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.15) 3px, transparent 3px),
        radial-gradient(circle at 40% 40%, rgba(255, 255, 255, 0.1) 2px, transparent 2px),
        radial-gradient(circle at 60% 70%, rgba(255, 255, 255, 0.12) 3px, transparent 3px),
        radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.08) 2px, transparent 2px),
        radial-gradient(circle at 70% 50%, rgba(0, 114, 188, 0.3) 3px, transparent 3px),
        radial-gradient(circle at 25% 60%, rgba(0, 114, 188, 0.25) 2px, transparent 2px),
        radial-gradient(circle at 85% 40%, rgba(0, 114, 188, 0.2) 4px, transparent 4px),
        radial-gradient(circle at 50% 20%, rgba(0, 114, 188, 0.15) 2px, transparent 2px);
    background-size: 180px 180px, 120px 120px, 80px 80px, 150px 150px, 100px 100px, 160px 160px, 90px 90px, 140px 140px, 110px 110px;
    animation: floatingParticles 20s linear infinite;
    pointer-events: none;
}

@keyframes floatingParticles {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 0.4;
    }
    50% {
        opacity: 0.9;
    }
    100% {
        transform: translateY(-20px) rotate(360deg);
        opacity: 0.4;
    }
}

/* Backdrop image không có float effect */
.backdrop-image {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    margin: 0 auto;
    display: block;
    position: relative;
}

/* Shimmer effect nhiều hơn và nhanh hơn */
.backdrop-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 10px;
    background: linear-gradient(45deg, transparent 20%, rgba(255, 255, 255, 0.2) 50%, transparent 80%);
    animation: shimmer 2s ease-in-out infinite;
    pointer-events: none;
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
        opacity: 0;
    }
    50% {
        opacity: 1;
    }
    100% {
        transform: translateX(100%);
        opacity: 0;
    }
}

/* Thêm shimmer effect thứ hai với hướng ngược lại */
.backdrop-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 10px;
    background: linear-gradient(-45deg, transparent 30%, rgba(255, 255, 255, 0.1) 50%, transparent 70%);
    animation: shimmerReverse 3s ease-in-out infinite 1s;
    pointer-events: none;
}

@keyframes shimmerReverse {
    0% {
        transform: translateX(100%);
        opacity: 0;
    }
    50% {
        opacity: 0.8;
    }
    100% {
        transform: translateX(-100%);
        opacity: 0;
    }
}

/* Responsive cho hình ảnh backdrop */
@media (max-width: 768px) {
    .backdrop-image {
        border-radius: 5px;
        box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    }
    
    .hero-section {
        padding: 1rem 0.5rem;
    }
}

.hero-section h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero-section p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* Documents Grid */
.documents-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.document-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid #e9ecef;
}

.document-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.card-icon {
    font-size: 3rem;
    color: #0072BC;
    margin-bottom: 1rem;
}

.calendar-badge {
    display: inline-block;
    width: 64px;
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid #e0e0e0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    background: #fff;
}
.calendar-badge .cal-month {
    display: block;
    background: #d9534f;
    color: #fff;
    text-align: center;
    font-weight: 700;
    font-size: 12px;
    letter-spacing: 1px;
    padding: 4px 0;
}
.calendar-badge .cal-day {
    display: block;
    color: #0072BC;
    text-align: center;
    font-weight: 800;
    font-size: 22px;
    padding: 8px 0;
}

.document-card h3 {
    color: #333;
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
    line-height: 1.4;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s;
    font-weight: 500;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, #0072BC, #005a9a);
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #005a9a, #004080);
    transform: translateY(-2px);
}

/* Document Content */
.document-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid #e9ecef;
}

.back-btn {
    color: #0072BC;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border: 2px solid #0072BC;
    border-radius: 8px;
    transition: all 0.3s;
}

.back-btn:hover {
    background-color: #0072BC;
    color: white;
}

.document-content {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    line-height: 1.8;
}

.document-content h1,
.document-content h2,
.document-content h3,
.document-content h4 {
    color: #0072BC;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.document-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    overflow-x: auto;
    display: block;
    white-space: nowrap;
}

.document-content th,
.document-content td {
    padding: 0.75rem;
    text-align: left;
    border: 1px solid #ddd;
    white-space: normal;
}

.document-content th {
    background-color: #0072BC;
    color: white;
    font-weight: 600;
}

.doc-subnav {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
    position: sticky;
    top: 70px;
    background: rgba(255,255,255,0.9);
    padding: 0.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}

.doc-subnav a {
    text-decoration: none;
    color: #0072BC;
    border: 1px solid #0072BC;
    padding: 0.4rem 0.7rem;
    border-radius: 6px;
    font-weight: 600;
}

.doc-subnav a:hover {
    background: #0072BC;
    color: white;
}

.document-content tr:nth-child(even) {
    background-color: #f8f9fa;
}

/* Footer */
.footer {
    background-color: #0072BC;
    color: white;
    font-family: Arial, sans-serif;
    text-align: center;
    padding: 1.5rem;
    margin-top: 3rem;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: #0072BC;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0,0,0,0.05);
        padding: 2rem 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    
    .nav-toggle.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    .hero-section h1 {
        font-size: 2rem;
    }
    
    .documents-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .document-card {
        padding: 1.5rem;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .document-content {
        padding: 1rem;
        overflow-x: auto;
    }
    
    .document-content table {
        font-size: 0.9rem;
    }
    
    .document-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .document-header h1 {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .hero-section {
        padding: 2rem 1rem;
    }
    
    .hero-section h1 {
        font-size: 1.8rem;
    }
    
    .document-content {
        padding: 1rem;
    }
    
    .document-content table {
        font-size: 0.8rem;
    }
    
    .document-content th,
    .document-content td {
        padding: 0.5rem;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .footer,
    .document-header {
        display: none;
    }
    
    .document-content {
        box-shadow: none;
        padding: 0;
    }
    
    body {
        background: white;
    }
}

.emoji-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 0.5rem;
}

.card-icon {
    text-align: center;
    margin-bottom: 1rem;
    color: #667eea;
}