:root {
    --primary-color: #12263F;
    --cta-color: #FFA500;
    --success-color: #34C759;
    --background-color: #F8F9FA;
    --accent-color: #6E48AA;
    --text-color: #333;
    --light-gray: #E9ECEF;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

.header-notice {
    background: linear-gradient(135deg, var(--primary-color), #0A1F44);
    color: white;
    text-align: center;
    padding: 15px;
    font-size: 16px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.navbar {
    position: sticky;
    top: 0;
    width: 100%;
    background-color: var(--primary-color);
    color: #fff;
    display: flex;
    justify-content: space-between;
    padding: 15px 5%;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.nav-links {
    display: flex;
    gap: 30px;
}

.navbar a {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.navbar a:hover {
    color: var(--cta-color);
}

.navbar a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: var(--cta-color);
    transition: var(--transition);
}

.navbar a:hover::after {
    width: 100%;
}

.main-container {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 5%;
}

article {
    background: white;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.08);
    padding: 40px;
    margin-bottom: 60px;
}

h2 {
    color: var(--primary-color);
    font-size: 32px;
    margin-top: 0;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--light-gray);
    position: relative;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100px;
    height: 2px;
    background: var(--cta-color);
}

h3 {
    color: var(--primary-color);
    font-size: 24px;
    margin: 30px 0 15px;
}

p {
    font-size: 17px;
    margin-bottom: 20px;
}

strong {
    color: var(--primary-color);
}

pre {
    background: #f5f7fa;
    border-radius: 8px;
    padding: 20px;
    overflow-x: auto;
    margin: 25px 0;
    box-shadow: inset 0 0 10px rgba(0,0,0,0.05);
    border-left: 4px solid var(--accent-color);
}

code {
    font-family: 'Courier New', monospace;
    font-size: 15px;
    color: #333;
}

.table-container {
    overflow-x: auto;
    margin: 30px 0;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    border-radius: 8px;
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
}

th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--light-gray);
}

th {
    background-color: var(--primary-color);
    color: white;
    font-weight: 500;
}

tr:nth-child(even) {
    background-color: #f9f9f9;
}

tr:hover {
    background-color: #f1f1f1;
}

.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
    margin: 40px 0;
}

.decorative-img {
    border-radius: 12px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    transition: var(--transition);
    width: 100%;
    height: auto;
    aspect-ratio: 1/1;
    object-fit: cover;
}

.decorative-img:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.15);
}

.cta-section {
    background: linear-gradient(135deg, var(--primary-color), #0A1F44);
    color: white;
    padding: 60px 5%;
    border-radius: 12px;
    margin: 60px 0;
    text-align: center;
}

.cta-title {
    font-size: 28px;
    margin-bottom: 20px;
}

.button-cta {
    background: linear-gradient(45deg, var(--cta-color), #FF7F50);
    border: none;
    border-radius: 30px;
    color: white;
    padding: 15px 35px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(255,165,0,0.3);
    display: inline-block;
    margin-top: 20px;
}

.button-cta:hover {
    background: linear-gradient(45deg, #FF7F50, var(--cta-color));
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(255,165,0,0.4);
}

.footer {
    background-color: var(--primary-color);
    color: white;
    padding: 40px 5%;
    text-align: center;
    margin-top: 60px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 20px;
}

.footer a {
    color: white;
    text-decoration: none;
    transition: var(--transition);
}

.footer a:hover {
    color: var(--cta-color);
}

.collapsible {
    background-color: #f1f1f1;
    color: var(--primary-color);
    cursor: pointer;
    padding: 18px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 16px;
    font-weight: 600;
    margin: 10px 0;
    border-radius: 8px;
    transition: var(--transition);
}

.active, .collapsible:hover {
    background-color: #ddd;
}

.collapsible-content {
    padding: 0 18px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.2s ease-out;
    background-color: white;
    border-radius: 0 0 8px 8px;
}

@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        align-items: center;
        padding: 15px;
    }
    
    .nav-links {
        flex-direction: column;
        gap: 15px;
        margin-top: 15px;
        align-items: center;
    }
    
    article {
        padding: 25px;
    }
    
    h2 {
        font-size: 28px;
    }
    
    h3 {
        font-size: 22px;
    }
    
    .image-grid {
        grid-template-columns: 1fr;
    }
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
}

.floating {
    animation: float 3s ease-in-out infinite;
}

.geometric-decoration {
    position: absolute;
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, rgba(110,72,170,0.1), rgba(110,72,170,0.3));
    border-radius: 30% 70% 70% 30%/30% 30% 70% 70%;
    z-index: -1;
    opacity: 0.7;
}

.decoration-1 {
    top: 10%;
    left: 5%;
    animation: float 6s ease-in-out infinite;
}

.decoration-2 {
    bottom: 15%;
    right: 5%;
    animation: float 5s ease-in-out infinite 1s;
}