/* ==========================================================
   Public Website - Marketing site styles
   ========================================================== */

/* ========== HEADER (Public) ========== */
.site-header {
    position: sticky; top: 0; z-index: 100;
    background: rgba(255, 255, 255, .92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-base);
}
[data-theme="dark"] .site-header { background: rgba(15, 23, 42, .92); }

.site-header-inner {
    display: flex; align-items: center; justify-content: space-between;
    padding: var(--space-4) 0;
}
.site-logo {
    display: flex; align-items: center; gap: var(--space-3);
    font-weight: var(--weight-bold);
    color: var(--color-text);
    font-size: var(--text-lg);
}
.site-logo-icon {
    width: 40px; height: 40px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-info));
    border-radius: var(--radius-md);
    display: flex; align-items: center; justify-content: center;
    color: white; font-size: 20px;
    box-shadow: var(--shadow-sm);
}

.site-nav {
    display: flex; align-items: center; gap: var(--space-2);
}
.site-nav-link {
    padding: 8px 14px;
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--color-text-muted);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}
.site-nav-link:hover { color: var(--color-text); background: var(--color-bg-hover); }
.site-nav-link.active { color: var(--color-primary); }

.site-nav-cta { display: flex; gap: var(--space-2); align-items: center; }

.mobile-menu-toggle { display: none; }

@media (max-width: 1024px) {
    .site-nav-links { display: none; }
    .mobile-menu-toggle {
        display: inline-flex; align-items: center; justify-content: center;
        width: 40px; height: 40px;
        border-radius: var(--radius-md);
        color: var(--color-text);
    }
    .mobile-menu-toggle:hover { background: var(--color-bg-hover); }
    .site-nav.mobile-open .site-nav-links {
        display: flex; flex-direction: column;
        position: fixed; top: 64px; left: 0; right: 0;
        background: var(--color-bg-elev);
        border-bottom: 1px solid var(--color-border);
        padding: var(--space-4); gap: 0;
        box-shadow: var(--shadow-lg);
    }
    .site-nav.mobile-open .site-nav-link { padding: 12px var(--space-4); width: 100%; }
}

/* ========== HERO ========== */
.hero {
    position: relative;
    padding: var(--space-16) 0;
    overflow: hidden;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, var(--color-primary-soft), transparent 60%),
        radial-gradient(ellipse 60% 50% at 100% 100%, var(--color-info-soft), transparent 60%),
        var(--color-bg);
}
.hero-content {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
    position: relative; z-index: 1;
}
.hero-badge {
    display: inline-flex; align-items: center; gap: var(--space-2);
    padding: 6px 14px;
    background: var(--color-bg-elev);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--weight-semi);
    color: var(--color-text-muted);
    margin-bottom: var(--space-5);
    box-shadow: var(--shadow-xs);
}
.hero-badge .dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-soft);
}
.hero-title {
    font-size: clamp(36px, 5vw, 64px);
    font-weight: var(--weight-extra);
    line-height: 1.05;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-5);
    background: linear-gradient(135deg, var(--color-text), var(--color-primary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.hero-subtitle {
    font-size: var(--text-lg);
    color: var(--color-text-muted);
    margin-bottom: var(--space-8);
    line-height: var(--leading-relaxed);
}
.hero-cta { display: inline-flex; gap: var(--space-3); flex-wrap: wrap; justify-content: center; }

/* Animated dotted bg for hero */
.hero::before {
    content: '';
    position: absolute; inset: 0;
    background-image: radial-gradient(circle, var(--color-border) 1px, transparent 1px);
    background-size: 24px 24px;
    opacity: .35;
    pointer-events: none;
    z-index: 0;
}

/* ========== SECTION ========== */
.section { padding: var(--space-16) 0; }
.section-sm { padding: var(--space-12) 0; }
.section-header { text-align: center; max-width: 720px; margin: 0 auto var(--space-12); }
.section-eyebrow {
    display: inline-block;
    font-size: var(--text-xs);
    font-weight: var(--weight-bold);
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-3);
}
.section-title {
    font-size: clamp(28px, 4vw, 42px);
    font-weight: var(--weight-bold);
    line-height: 1.15;
    margin-bottom: var(--space-4);
    letter-spacing: -0.02em;
}
.section-subtitle {
    font-size: var(--text-md);
    color: var(--color-text-muted);
    line-height: var(--leading-relaxed);
}

/* ========== FEATURE CARDS ========== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-5);
}
.feature-card {
    background: var(--color-bg-elev);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    transition: all var(--transition-base);
    position: relative; overflow: hidden;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--color-primary); }
.feature-icon {
    width: 52px; height: 52px;
    border-radius: var(--radius-lg);
    background: var(--color-primary-soft);
    color: var(--color-primary);
    display: inline-flex; align-items: center; justify-content: center;
    font-size: 24px;
    margin-bottom: var(--space-4);
}
.feature-card h3 { margin-bottom: var(--space-2); font-size: var(--text-lg); }
.feature-card p { color: var(--color-text-muted); font-size: var(--text-sm); line-height: var(--leading-relaxed); }

/* ========== COURSE LIST (Public) ========== */
.public-courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-5);
}
.public-course-card {
    background: var(--color-bg-elev);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-base);
    display: flex; flex-direction: column;
}
.public-course-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.public-course-cover {
    height: 160px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-info));
    display: flex; align-items: center; justify-content: center;
    color: white; font-size: 64px;
    position: relative;
}
.public-course-body { padding: var(--space-5); flex: 1; display: flex; flex-direction: column; }
.public-course-body h3 { font-size: var(--text-lg); margin-bottom: var(--space-2); }
.public-course-body p { color: var(--color-text-muted); font-size: var(--text-sm); flex: 1; margin-bottom: var(--space-4); }
.public-course-footer { display: flex; justify-content: space-between; align-items: center; }
.public-course-price { font-size: var(--text-xl); font-weight: var(--weight-bold); color: var(--color-primary); }

/* ========== ACCORDION (FAQ) ========== */
.accordion-list { display: flex; flex-direction: column; gap: var(--space-3); }
.accordion-item {
    background: var(--color-bg-elev);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color var(--transition-base);
}
.accordion-item.open { border-color: var(--color-primary); }
.accordion-trigger {
    width: 100%;
    padding: var(--space-5);
    display: flex; justify-content: space-between; align-items: center; gap: var(--space-3);
    text-align: left;
    font-weight: var(--weight-semi);
    color: var(--color-text);
    font-size: var(--text-md);
    transition: background var(--transition-base);
}
.accordion-trigger:hover { background: var(--color-bg-hover); }
.accordion-trigger .icon { transition: transform var(--transition-base); flex-shrink: 0; color: var(--color-primary); }
.accordion-item.open .accordion-trigger .icon { transform: rotate(45deg); }
.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), padding var(--transition-slow);
    padding: 0 var(--space-5);
    color: var(--color-text-muted);
    line-height: var(--leading-relaxed);
}
.accordion-item.open .accordion-content { max-height: 1000px; padding: 0 var(--space-5) var(--space-5); }

/* ========== CONTACT ========== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-8); }
@media (max-width: 768px) { .contact-grid { grid-template-columns: 1fr; } }

.contact-info-card {
    background: var(--color-bg-elev);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    margin-bottom: var(--space-4);
    display: flex; gap: var(--space-4);
}
.contact-info-icon {
    width: 48px; height: 48px;
    border-radius: var(--radius-md);
    background: var(--color-primary-soft);
    color: var(--color-primary);
    display: flex; align-items: center; justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}
.contact-info-card h4 { font-size: var(--text-base); margin-bottom: var(--space-1); }
.contact-info-card p, .contact-info-card a { color: var(--color-text-muted); font-size: var(--text-sm); line-height: var(--leading-relaxed); }

/* ========== FOOTER ========== */
.site-footer {
    background: var(--color-bg-elev-2);
    border-top: 1px solid var(--color-border);
    padding: var(--space-12) 0 var(--space-6);
    margin-top: var(--space-16);
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-8);
    margin-bottom: var(--space-8);
}
@media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .footer-grid { grid-template-columns: 1fr; } }

.footer-col h4 { font-size: var(--text-sm); margin-bottom: var(--space-4); color: var(--color-text); }
.footer-col ul { display: flex; flex-direction: column; gap: var(--space-2); }
.footer-col a { color: var(--color-text-muted); font-size: var(--text-sm); transition: color var(--transition-base); }
.footer-col a:hover { color: var(--color-primary); }
.footer-col p { color: var(--color-text-muted); font-size: var(--text-sm); line-height: var(--leading-relaxed); }

.footer-social { display: flex; gap: var(--space-2); margin-top: var(--space-3); }
.footer-social a {
    width: 36px; height: 36px;
    border-radius: var(--radius-md);
    background: var(--color-bg-elev);
    border: 1px solid var(--color-border);
    display: inline-flex; align-items: center; justify-content: center;
    color: var(--color-text-muted);
    transition: all var(--transition-base);
}
.footer-social a:hover { color: var(--color-primary); border-color: var(--color-primary); transform: translateY(-2px); }

.footer-bottom {
    padding-top: var(--space-5);
    border-top: 1px solid var(--color-border);
    text-align: center;
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

/* ========== BREADCRUMB SECTION (Public pages) ========== */
.page-breadcrumb {
    padding: var(--space-12) 0 var(--space-8);
    background:
        radial-gradient(ellipse at top, var(--color-primary-soft), transparent 70%),
        var(--color-bg);
    text-align: center;
    border-bottom: 1px solid var(--color-border);
}
.page-breadcrumb h1 {
    font-size: clamp(28px, 4vw, 42px);
    font-weight: var(--weight-bold);
    margin-bottom: var(--space-3);
}
.page-breadcrumb-trail {
    display: inline-flex; align-items: center; gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}
.page-breadcrumb-trail a:hover { color: var(--color-primary); }
.page-breadcrumb-trail .sep { color: var(--color-text-dim); }