/* ==========================================================================
   HANOI - LAYOUT & RESPONSIVE GRID SYSTEM (layout.css)
   ========================================================================== */

/* Glassmorphic Top Navigation Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: rgba(11, 9, 12, 0.75);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid var(--border-glass);
    z-index: 1000;
    display: flex;
    align-items: center;
    transition: var(--transition-smooth);
}

header.scrolled {
    background: rgba(8, 6, 9, 0.9);
    height: 70px;
    border-bottom-color: var(--border-glass-bright);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo-group {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-primary);
    cursor: pointer;
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 10px rgba(212, 130, 59, 0.4);
}

.logo-icon::before {
    content: "H";
    font-weight: 900;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    list-style: none;
}

.nav-links a {
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.95rem;
    padding: var(--space-xs) 0;
    border-bottom: 2px solid transparent;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
    border-bottom-color: var(--primary);
}

/* Mobile Menu Toggle button */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition-smooth);
}

/* Hero Section Layout */
.hero-section {
    padding-top: calc(var(--header-height) + var(--space-xl));
    padding-bottom: var(--space-xl);
    min-height: 90vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

/* Decorative cosmic glowing backing blobs */
.hero-section::before {
    content: "";
    position: absolute;
    top: 20%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(212, 130, 59, 0.15) 0%, transparent 70%);
    z-index: -1;
    pointer-events: none;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: var(--space-lg);
    align-items: center;
}

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

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
}

/* Main Core Grid Features Section */
.section {
    padding: var(--space-xl) 0;
    position: relative;
}

.section-title-group {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.section-subtitle {
    text-transform: uppercase;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--primary);
    margin-bottom: var(--space-xs);
}

.section-title {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: var(--space-xs);
}

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

/* Legal Page Typography Framework */
.legal-container {
    padding-top: calc(var(--header-height) + var(--space-lg));
    padding-bottom: var(--space-xl);
    max-width: 800px;
    margin: 0 auto;
}

.legal-card {
    background: var(--surface-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    box-shadow: var(--shadow-premium);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.legal-header {
    border-bottom: 1px solid var(--border-glass);
    padding-bottom: var(--space-sm);
    margin-bottom: var(--space-md);
}

.legal-body h2 {
    font-size: 1.3rem;
    margin-top: var(--space-md);
    margin-bottom: var(--space-xs);
    color: var(--text-primary);
}

.legal-body p, 
.legal-body ul {
    margin-bottom: var(--space-sm);
    font-size: 0.95rem;
    color: var(--text-muted);
}

.legal-body ul {
    padding-left: var(--space-md);
}

.legal-body li {
    margin-bottom: 4px;
}

/* Premium Footer */
footer {
    border-top: 1px solid var(--border-glass);
    background: rgba(11, 9, 12, 0.9);
    padding: var(--space-lg) 0;
    margin-top: var(--space-xl);
}

.footer-grid {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.footer-copy {
    color: var(--text-dim);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: var(--space-md);
    list-style: none;
}

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

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

/* Responsive Rules & Mobile Adapters */
@media (max-width: 992px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
        text-align: center;
    }
    
    .hero-content {
        align-items: center;
    }
}

@media (max-width: 768px) {
    header {
        height: 70px;
    }
    
    .menu-toggle {
        display: flex;
        z-index: 1100;
    }
    
    /* Responsive slide-down navigation overlay */
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background: rgba(11, 9, 12, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: var(--space-lg);
        transition: var(--transition-smooth);
        border-left: 1px solid var(--border-glass);
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .footer-grid {
        flex-direction: column;
        text-align: center;
    }
}