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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: var(--transition);
    line-height: 1.6;
}

/* Main Containers */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-fluid {
    padding: 0 var(--spacing-lg);
}

main {
    min-height: calc(100vh - 200px);
}

/* Page Navigation */
.page {
    display: block;
    animation: fadeIn 0.3s ease-in;
}

.page.d-none {
    display: none;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Section Spacing */
section {
    padding: var(--spacing-xxl) 0;
}

section.compact {
    padding: var(--spacing-xl) 0;
}

section.spacious {
    padding: calc(var(--spacing-xxl) * 1.5) 0;
}

/* Responsive Padding */
@media (max-width: 768px) {
    section {
        padding: var(--spacing-xl) 0;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
}

/* Overflow Hidden */
.overflow-hidden {
    overflow: hidden;
}

/* Z-index Management */
.navbar {
    z-index: 1030;
}

.modal {
    z-index: 2000;
}

/* Image responsive */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--light-color);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: var(--radius-md);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}