/* ==========================================================================
   Global Variables & Base Reset (Indigo & Violet Theme)
   ========================================================================== */
:root {
    /* New Color Palette: Indigo & Electric Violet */
    --brand-primary: #4f46e5;         /* Indigo 600 */
    --brand-primary-hover: #4338ca;   /* Indigo 700 */
    --brand-primary-light: #eef2ff;   /* Indigo 50 */
    --brand-accent: #8b5cf6;          /* Violet 500 */
    
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --text-dark: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    
    /* Typography & Spacing */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05);
    --shadow-md: 0 4px 14px rgba(79, 70, 229, 0.12);
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--brand-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--brand-primary-hover);
}

ul {
    list-style: none;
}

.container {
    width: 100%;
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 20px;
}

.text-center {
    text-align: center;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.brand-name {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--brand-primary);
    letter-spacing: -0.5px;
}

.main-nav ul {
    display: flex;
    gap: 28px;
}

.main-nav a {
    color: var(--text-dark);
    font-weight: 500;
    font-size: 0.95rem;
}

.main-nav a:hover {
    color: var(--brand-primary);
}

.btn-register, .btn-primary-lg, .btn-card-primary {
    background-color: var(--brand-primary);
    color: var(--bg-white) !important;
    padding: 11px 22px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    display: inline-block;
    border: none;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(79, 70, 229, 0.25);
    transition: all 0.2s ease;
}

.btn-register:hover, .btn-primary-lg:hover, .btn-card-primary:hover {
    background-color: var(--brand-primary-hover);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.35);
    transform: translateY(-1px);
}

/* ==========================================================================
   Badges & Subheadings
   ========================================================================== */
.badge {
    background: var(--brand-primary-light);
    color: var(--brand-primary);
    border: 1px solid rgba(79, 70, 229, 0.2);
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 700;
    display: inline-block;
    margin-bottom: 16px;
}

.sub-heading {
    color: var(--brand-primary);
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    display: block;
    margin-bottom: 8px;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
    background-color: var(--bg-white);
    border-top: 1px solid var(--border-color);
    padding-top: 60px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
}

.footer-brand {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--brand-primary);
    display: inline-block;
    margin-bottom: 12px;
}

.footer-col p {
    color: var(--text-muted);
    font-size: 0.9rem;
    max-width: 280px;
}

.footer-col h4 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-dark);
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul a {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-col ul a:hover {
    color: var(--brand-primary);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding: 20px 0;
    background-color: var(--bg-light);
}

.footer-bottom-content {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

@media (max-width: 768px) {
    .main-nav { display: none; }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
}