/* ==========================================================================
   Public Website Styles
   ========================================================================== */

/* --- Navigation --- */
.pub-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    --pub-nav-surface-bg: rgba(9, 17, 36, 0.98);
    --pub-nav-surface-border: #1B2232;
    padding: 14px 0;
    transition: background-color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), padding var(--transition-base);
    background: transparent;
    border-bottom: 1px solid transparent;
}
.pub-nav.scrolled {
    background: var(--pub-nav-surface-bg);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border-bottom-color: var(--pub-nav-surface-border);
    box-shadow: 0 8px 20px rgba(6, 12, 30, 0.24);
    padding: 12px 0;
}
.pub-nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.pub-nav-brand {
    display: inline-flex;
    align-items: center;
    padding: 5px 12px;
    border-radius: 10px;
    background: rgba(6, 12, 30, 0.52);
    border: 1px solid rgba(255, 255, 255, 0.08);
}
.pub-nav-logo {
    display: block;
    height: 62px;
    width: auto;
    max-width: 100%;
    object-fit: contain;
}
.pub-nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    list-style: none;
}
.pub-nav-links a {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    font-weight: 500;
    padding: 6px 2px;
    transition: color var(--transition-fast);
}
.pub-nav-links a:hover { color: var(--text-primary); }
.pub-nav-links .btn { margin-left: var(--space-xs); }
.pub-nav-cta {
    padding: 10px 16px;
    min-height: 40px;
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: 650;
    background: linear-gradient(135deg, rgba(15, 76, 151, 0.24), rgba(36, 122, 226, 0.16));
    border: 1px solid rgba(116, 185, 255, 0.42);
    color: #eaf2ff;
    box-shadow: inset 0 0 0 1px rgba(9, 27, 58, 0.55), 0 3px 10px rgba(6, 12, 30, 0.18);
    transition: background-color 220ms ease, border-color 220ms ease, color 220ms ease, box-shadow 220ms ease, transform 220ms ease;
}
.pub-nav-cta:hover {
    background: linear-gradient(135deg, rgba(15, 76, 151, 0.34), rgba(36, 122, 226, 0.24));
    border-color: rgba(116, 185, 255, 0.58);
    color: #f3f8ff;
    transform: translateY(-1px);
    box-shadow: inset 0 0 0 1px rgba(15, 76, 151, 0.45), 0 6px 14px rgba(11, 27, 56, 0.22);
}
.pub-nav-cta:active {
    transform: translateY(0);
    background: linear-gradient(135deg, rgba(15, 76, 151, 0.3), rgba(36, 122, 226, 0.2));
    border-color: rgba(116, 185, 255, 0.5);
    box-shadow: inset 0 0 0 1px rgba(9, 27, 58, 0.55), 0 2px 8px rgba(6, 12, 30, 0.18);
}
.pub-nav-cta:focus-visible {
    outline: 3px solid rgba(173, 133, 59, 0.95);
    outline-offset: 2px;
}
.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 24px;
    width: 48px;
    height: 48px;
    cursor: pointer;
}

/* --- Hero Section --- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 112px 0 72px;
}
.hero::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(15, 76, 151, 0.20), transparent 70%);
    top: -200px;
    right: -200px;
    border-radius: 50%;
    animation: heroGlow 8s ease-in-out infinite alternate;
}
.hero::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(15, 76, 151, 0.12), transparent 70%);
    bottom: -100px;
    left: -100px;
    border-radius: 50%;
    animation: heroGlow 10s ease-in-out infinite alternate-reverse;
}
@keyframes heroGlow {
    from { transform: translate(0, 0) scale(1); }
    to { transform: translate(30px, -30px) scale(1.1); }
}
.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    padding: 0 var(--space-lg);
}
.hero h1 {
    font-size: clamp(2.2rem, 5.2vw, 3.6rem);
    font-weight: 800;
    margin-bottom: 18px;
    line-height: 1.12;
    letter-spacing: 0.01em;
    animation: fadeInUp 0.8s ease 0.1s both;
}
.hero h1 .gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero p {
    font-size: clamp(1rem, 2vw, 1.125rem);
    color: var(--text-secondary);
    max-width: 62ch;
    margin: 0 auto 22px;
    line-height: 1.75;
    animation: fadeInUp 0.8s ease 0.2s both;
}
.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    animation: fadeInUp 0.8s ease 0.3s both;
}
.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-3xl);
    margin-top: var(--space-3xl);
    animation: fadeInUp 0.8s ease 0.4s both;
}
.hero-stat-value {
    font-family: var(--font-display);
    font-size: var(--text-3xl);
    font-weight: 800;
    color: var(--text-primary);
}
.hero-stat-label {
    font-size: var(--text-sm);
    color: var(--text-muted);
    margin-top: var(--space-xs);
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --- Sections --- */
.section {
    padding: 88px 0;
    position: relative;
}
.section-header {
    text-align: center;
    margin-bottom: 42px;
}
.section-header h2 {
    font-size: clamp(1.9rem, 3.5vw, 2.5rem);
    font-weight: 800;
    margin-bottom: var(--space-md);
    line-height: 1.18;
}
.section-header p {
    font-size: clamp(1rem, 1.8vw, 1.1rem);
    color: var(--text-secondary);
    max-width: 64ch;
    margin: 0 auto;
    line-height: 1.72;
}

/* --- Services/Features Grid --- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
}
.feature-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
    position: relative;
    overflow: hidden;
}
.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-gradient);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}
.feature-card:hover {
    transform: translateY(-3px);
    border-color: rgba(15, 76, 151, 0.35);
    box-shadow: var(--shadow-glow);
}
.feature-card:hover::before {
    transform: scaleX(1);
}
.feature-icon {
    font-size: 40px;
    margin-bottom: var(--space-md);
}
.feature-card h3 {
    font-size: var(--text-xl);
    margin-bottom: var(--space-sm);
}
.feature-card p {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    line-height: 1.7;
}

/* --- About Section --- */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
}
.about-text h3 {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-md);
}
.about-text p {
    color: var(--text-secondary);
    line-height: 1.78;
    margin-bottom: var(--space-md);
}
.about-list {
    list-style: none;
    margin-top: var(--space-lg);
}
.about-list li {
    padding: var(--space-sm) 0;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}
.about-list li::before {
    content: '✓';
    color: var(--accent-green);
    font-weight: bold;
}

/* --- Contact Section --- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
}
.contact-info-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
}
.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md) 0;
}
.contact-info-item:not(:last-child) {
    border-bottom: 1px solid var(--border-color);
}
.contact-icon {
    font-size: 24px;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-glass);
    border-radius: var(--radius-md);
    flex-shrink: 0;
}
.contact-info-item h4 {
    font-size: var(--text-base);
    margin-bottom: var(--space-xs);
}
.contact-info-item p {
    color: var(--text-muted);
    font-size: var(--text-sm);
}
.contact-info-link {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    line-height: 1.65;
    text-decoration: underline;
    text-decoration-color: rgba(15, 76, 151, 0.42);
    text-underline-offset: 3px;
    text-decoration-thickness: 1px;
    overflow-wrap: anywhere;
    transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}
.contact-info-link:hover {
    color: var(--text-primary);
    text-decoration-color: var(--accent-primary);
}
.contact-info-link:focus-visible {
    outline: 3px solid rgba(173, 133, 59, 0.85);
    outline-offset: 2px;
    border-radius: 4px;
}

/* --- Footer --- */
.pub-footer {
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
}
.pub-footer p {
    color: #aebbd0;
    font-size: var(--text-sm);
    white-space: nowrap;
}

.pub-footer a {
    color: #d6e1f2;
    text-decoration: underline;
    text-decoration-color: rgba(214, 225, 242, 0.72);
    text-underline-offset: 2px;
    text-decoration-thickness: 1px;
    transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
    white-space: nowrap;
}

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

.pub-footer a:focus-visible {
    outline: 3px solid rgba(173, 133, 59, 0.85);
    outline-offset: 2px;
    border-radius: 4px;
}

.pub-footer .footer-meta-link {
    font-size: 0.85rem;
}

@media (max-width: 1100px) {
    .pub-footer p {
        white-space: normal;
        line-height: 1.7;
    }
}

/* --- Intermediate screens: stabilize to 2 columns and center orphan card --- */
@media (min-width: 775px) and (max-width: 1000px) {
    #courses .features-grid,
    #testimonials .features-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
    }

    #courses .features-grid > .feature-card:last-child:nth-child(odd),
    #testimonials .features-grid > .testimonial-card:last-child:nth-child(odd) {
        grid-column: 1 / -1;
        width: 100%;
        max-width: calc((100% - var(--space-lg)) / 2);
        justify-self: center;
    }
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .pub-nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--pub-nav-surface-bg);
        -webkit-backdrop-filter: blur(20px);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: var(--space-lg);
        gap: var(--space-md);
        border-bottom: 1px solid var(--pub-nav-surface-border);
        box-shadow: 0 8px 20px rgba(6, 12, 30, 0.24);
    }
    .pub-nav-links.active { display: flex; }
    .nav-toggle { display: block; }
    .pub-nav-links .btn {
        margin-left: 0;
    }
    .pub-nav-links a,
    .pub-nav-links .btn {
        min-height: 48px;
        display: inline-flex;
        align-items: center;
    }
    .pub-nav-cta {
        padding: 9px 14px;
        min-height: 48px;
    }
    .pub-nav-brand {
        padding: 3px 10px;
        border-radius: 8px;
    }
    .pub-nav-logo {
        height: 48px;
    }
    .hero { min-height: auto; padding: 108px 0 54px; }
    .hero h1 { font-size: var(--text-3xl); }
    .hero-stats { gap: var(--space-xl); }
    .hero-actions { flex-direction: column; }
    .about-content { grid-template-columns: 1fr; gap: var(--space-xl); }
    .about-content .about-text { order: -1; }
    .about-content .about-image-container { order: 1; }
    .contact-grid { grid-template-columns: 1fr; }
    .features-grid { grid-template-columns: 1fr; }
    .section { padding: 72px 0; }
}