/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--gap-md);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--gap-md);
}

/* Main Layout */
.site-main {
    min-height: calc(100vh - var(--header-height) - 200px);
    padding-top: calc(var(--header-height) + var(--gap-lg));
    padding-bottom: var(--gap-2xl);
}

/* Two Column Layout */
.layout-with-sidebar {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--gap-lg);
}

.content-area { min-width: 0; }

.sidebar-area {
    display: none;
}

/* Grid System */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--gap-md);
}

.grid-3 {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--gap-md);
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--gap-md);
}

/* Section */
.section {
    margin-bottom: var(--gap-2xl);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--gap-md);
}

.section-title {
    font-size: var(--fs-lg);
    font-weight: var(--fw-bold);
    color: var(--text-primary);
    margin-bottom: 0;
}

.section-title::before {
    content: '';
    display: inline-block;
    width: 3px;
    height: 14px;
    background: var(--neon-green);
    margin-right: var(--gap-sm);
    vertical-align: middle;
}

.section-link {
    font-size: var(--fs-sm);
    color: var(--neon-green);
    display: flex;
    align-items: center;
    gap: var(--gap-xs);
    font-family: var(--font-mono);
}
.section-link:hover {
    color: var(--accent-hover);
}
.section-link i { font-size: 10px; transition: transform var(--transition-fast); }
.section-link:hover i { transform: translateX(3px); }

/* Page Header / Banner */
.page-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: var(--gap-lg) 0;
    margin-bottom: var(--gap-lg);
}

.page-header-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--gap-md);
}

.page-title {
    font-size: var(--fs-xl);
    font-weight: var(--fw-bold);
    margin-bottom: var(--gap-xs);
}

.page-description {
    color: var(--text-secondary);
    font-size: var(--fs-base);
}

/* Tabs */
.tabs {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: var(--gap-md);
    overflow-x: auto;
}

.tab-item {
    padding: var(--gap-sm) var(--gap-md);
    color: var(--text-secondary);
    font-size: var(--fs-sm);
    font-weight: var(--fw-medium);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    white-space: nowrap;
    transition: all var(--transition-fast);
}

.tab-item:hover { color: var(--text-primary); }

.tab-item.active {
    color: var(--neon-green);
    border-bottom-color: var(--neon-green);
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* Overlay */
.overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-overlay);
    z-index: var(--z-overlay);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}
.overlay.active { opacity: 1; visibility: visible; }

/* Modal */
.modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.95);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: var(--gap-lg);
    z-index: var(--z-modal);
    max-width: 500px;
    width: 90%;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}
.modal.active { opacity: 1; visibility: visible; transform: translate(-50%, -50%) scale(1); }

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--gap-md);
}

.modal-close {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: var(--fs-lg);
    cursor: pointer;
    padding: var(--gap-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}
.modal-close:hover {
    color: var(--neon-green);
    border-color: var(--neon-green);
}

/* Divider */
.divider {
    height: 1px;
    background: var(--border);
    margin: var(--gap-md) 0;
}

/* Card base */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: all var(--transition-base);
}
.card:hover {
    border-color: rgba(0, 255, 136, 0.3);
    box-shadow: var(--card-shadow-hover);
}

/* Responsive breakpoints */
@media (min-width: 576px) {
    .grid-2 { grid-template-columns: repeat(2, 1fr); }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 768px) {
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .grid-4 { grid-template-columns: repeat(3, 1fr); }
    .container { padding: 0 var(--gap-lg); }
}

@media (min-width: 1024px) {
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }

    .layout-with-sidebar {
        grid-template-columns: 1fr var(--sidebar-width);
    }

    .sidebar-area {
        display: block;
    }
}

@media (min-width: 1280px) {
    .container { padding: 0 var(--gap-xl); }
}