:root {
    --brand-primary: #0d6efd;
    --brand-primary-rgb: 13, 110, 253;

    /* Light Mode */
    --brand-bg: #f8f9fa;
    --brand-secondary-bg: #ffffff;
    --brand-text: #212529;
    --brand-border: #dee2e6;
    --brand-hero-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    --brand-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.05);
}

[data-bs-theme="dark"] {
    --brand-primary: #3b82f6; /* A slightly brighter blue for dark mode */
    --brand-primary-rgb: 59, 130, 246;

    /* Dark Mode */
    --brand-bg: #121212;
    --brand-secondary-bg: #1e1e1e;
    --brand-text: #f8f9fa;
    --brand-border: #444;
    --brand-hero-gradient: linear-gradient(135deg, #2a2a2a 0%, #1a1a1a 100%);
    --brand-shadow: 0 0.5rem 1.5rem rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Vazirmatn', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
    background-color: var(--brand-bg);
    color: var(--brand-text);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* --- Hero Section --- */
.hero {
    background: var(--brand-hero-gradient);
    border: 1px solid var(--brand-border);
    border-radius: 1.25rem;
    padding: 4rem 2.5rem;
    text-align: center;
    box-shadow: var(--brand-shadow);
    transition: background 0.3s ease, border-color 0.3s ease;
}

.hero .display-5 {
    font-weight: 700;
}

.hero .lead {
    font-size: 1.25rem;
    font-weight: 300;
    opacity: 0.9;
}

/* --- Theme Toggler --- */
.theme-toggle-btn {
    padding: 0.25rem 0.5rem;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 0.5rem;
}

.theme-toggle-btn:hover {
    background-color: rgba(var(--bs-emphasis-color-rgb), 0.1);
}

.theme-icon-dark {
    display: none;
}

.theme-icon-light {
    display: block;
}

[data-bs-theme="dark"] .theme-icon-dark {
    display: block;
}

[data-bs-theme="dark"] .theme-icon-light {
    display: none;
}

/* --- General Components --- */
.card {
    background-color: var(--brand-secondary-bg);
    border: 1px solid var(--brand-border);
    box-shadow: var(--brand-shadow);
    transition: background 0.3s ease, border-color 0.3s ease;
}

.form-control, .form-select {
    background-color: var(--brand-secondary-bg);
}

.form-control:focus, .form-select:focus {
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 0.25rem rgba(var(--brand-primary-rgb), 0.25);
}

.btn-primary {
    background-color: var(--brand-primary);
    border-color: var(--brand-primary);
}

.nav-link.active {
    font-weight: 500;
}