/* ==========================================================================
   IMSChat Dark Theme CSS
   Based on IMSciences University Dark Slate & Sky Blue Palette
   ========================================================================== */

:root {
    --bg-dark: #0B0F19;
    --bg-surface: #0F172A;
    --bg-card: #1E293B;
    --bg-card-hover: #334155;
    
    --primary-blue: #3B82F6;
    --primary-blue-hover: #2563EB;
    --border-blue: rgba(59, 130, 246, 0.25);
    
    --text-main: #F8FAFC;
    --text-muted: #94A3B8;
    --text-heading: #FFFFFF;

    --font-family: 'Inter', sans-serif;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-family);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* --- Top Utility Navigation --- */
.top-header {
    background-color: var(--bg-surface);
    border-bottom: 2px solid var(--primary-blue);
    padding: 0.5rem 0;
    font-size: 0.875rem;
}

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

.announcement {
    color: var(--text-muted);
}

.announcement strong {
    color: var(--primary-blue);
}

.top-links a {
    color: var(--text-muted);
    text-decoration: none;
    margin-left: 1.25rem;
    transition: color 0.2s ease;
}

.top-links a:hover {
    color: var(--primary-blue);
}

/* --- Main Navigation Bar --- */
.main-nav {
    background-color: var(--bg-surface);
    padding: 1.25rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.brand-logo {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-heading);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.logo-accent {
    color: var(--primary-blue);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-item {
    color: var(--text-muted);
    text-decoration: none;
    margin-right: 0.5rem;
    font-weight: 500;
}

.nav-item:hover {
    color: var(--text-heading);
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 0.6rem 1.25rem;
    border-radius: 6px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
    font-size: 0.95rem;
}

.btn-primary {
    background-color: var(--primary-blue-hover);
    color: #ffffff;
    border: 1px solid var(--primary-blue-hover);
}

.btn-primary:hover {
    background-color: var(--primary-blue);
    border-color: var(--primary-blue);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-outline {
    background-color: transparent;
    color: var(--text-main);
    border: 1px solid var(--primary-blue);
}

.btn-outline:hover {
    background-color: var(--primary-blue);
    color: #ffffff;
}

.btn-large {
    padding: 0.8rem 1.75rem;
    font-size: 1.05rem;
}

/* --- Hero Section --- */
.hero-section {
    padding: 5rem 0;
    background: linear-gradient(180deg, var(--bg-surface) 0%, var(--bg-dark) 100%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.hero-container {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 3rem;
    align-items: center;
}

.badge {
    display: inline-block;
    background-color: rgba(59, 130, 246, 0.15);
    color: var(--primary-blue);
    padding: 0.35rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
    border: 1px solid var(--border-blue);
}

.hero-text h1 {
    font-size: 2.75rem;
    line-height: 1.2;
    color: var(--text-heading);
    margin-bottom: 1.25rem;
}

.hero-text p {
    font-size: 1.15rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.hero-cards {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.glass-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-blue);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    transition: transform 0.2s ease;
}

.glass-card:hover {
    transform: translateY(-3px);
}

.glass-card h3 {
    color: var(--text-heading);
    margin-bottom: 0.5rem;
}

.glass-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* --- Features / Check Out Section --- */
.features-section {
    padding: 5rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 3.5rem;
}

.section-title h2 {
    font-size: 2.25rem;
    color: var(--text-heading);
    margin-bottom: 0.5rem;
}

.section-title p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-blue);
    padding: 2rem;
    border-radius: 12px;
    transition: all 0.2s ease;
}

.feature-card:hover {
    background-color: var(--bg-card-hover);
    border-color: var(--primary-blue);
}

.icon-box {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    color: var(--text-heading);
    font-size: 1.3rem;
    margin-bottom: 0.75rem;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.98rem;
}

/* --- Announcement / CTA Banner --- */
.banner-section {
    background-color: var(--bg-card);
    border-top: 1px solid var(--border-blue);
    border-bottom: 1px solid var(--border-blue);
    padding: 3.5rem 0;
    margin-top: 2rem;
}

.banner-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.banner-content h2 {
    color: var(--text-heading);
    font-size: 1.8rem;
}

.banner-content p {
    color: var(--text-muted);
}

.banner-buttons {
    display: flex;
    gap: 1rem;
}

/* --- Footer --- */
.footer {
    background-color: var(--bg-surface);
    padding: 2rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    margin-top: 4rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    margin-left: 1.25rem;
}

.footer-links a:hover {
    color: var(--primary-blue);
}

/* --- Responsive Adjustments --- */
@media (max-width: 768px) {
    .hero-container {
        grid-template-columns: 1fr;
    }

    .banner-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .top-nav {
        flex-direction: column;
        gap: 0.5rem;
        align-items: flex-start;
    }

    .top-links a {
        margin-left: 0;
        margin-right: 1rem;
    }
}