:root {
    --color-primary: #00AEEF; /* Sky Blue */
    --color-secondary: #1B2B4F; /* Navy Blue */
    --color-accent: #008CBA;
    --color-bg: #F4F7F6;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-white: #FFFFFF;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --radius-md: 8px;
    --radius-lg: 12px;
    --font-main: 'Inter', sans-serif;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Layout Utilities */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header */
.site-header {
    background-color: var(--color-white);
    box-shadow: var(--shadow-sm);
    padding: 1rem 0;
    border-bottom: 4px solid var(--color-primary);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.site-logo {
    height: 60px;
    width: auto;
}

.site-title h1 {
    font-size: 1.5rem;
    color: var(--color-secondary);
    font-weight: 700;
    line-height: 1.2;
}

.site-title p {
    font-size: 0.9rem;
    color: var(--color-primary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--color-secondary) 0%, #2C3E50 100%);
    color: var(--color-white);
    padding: 3rem 0;
    text-align: center;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto;
    opacity: 0.9;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 3rem 0;
}

.section-block {
    margin-bottom: 4rem;
}

.section-header {
    margin-bottom: 2rem;
    border-left: 5px solid var(--color-primary);
    padding-left: 1rem;
}

.section-header h3 {
    font-size: 1.8rem;
    color: var(--color-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-header p {
    color: var(--color-text-light);
}

/* Downloads Grid */
.downloads-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
}

.file-card {
    background: var(--color-white);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid #E0E0E0;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.file-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.file-icon {
    font-size: 2.5rem;
    color: #217346; /* Excel Green */
    margin-bottom: 1rem;
}

.file-info h4 {
    color: var(--color-secondary);
    margin-bottom: 0.5rem;
}

.file-info p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: 1rem;
}

.btn-download {
    display: inline-block;
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: background-color 0.2s;
}

.btn-download:hover {
    background-color: #009ACD;
}

/* External Links Grid */
.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.link-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border-top: 5px solid var(--color-secondary);
}

.qr-placeholder img {
    width: 150px;
    height: 150px;
    margin-bottom: 1.5rem;
    border: 1px solid #eee;
    padding: 5px;
}

.link-card h4 {
    font-size: 1.2rem;
    color: var(--color-secondary);
    margin-bottom: 1rem;
}

.btn-link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    border-bottom: 2px solid transparent;
    transition: border-color 0.2s;
}

.btn-link:hover {
    border-bottom-color: var(--color-primary);
}

/* Footer */
.site-footer {
    background-color: var(--color-secondary);
    color: var(--color-white);
    text-align: center;
    padding: 2rem 0;
    margin-top: auto;
}

.footer-small {
    font-size: 0.8rem;
    opacity: 0.7;
    margin-top: 0.5rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h2 {
        font-size: 2rem;
    }
    
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .logo-container {
        flex-direction: column;
    }
}