/* ====================================================================
   ESTILOS PRINCIPALES - CERTIFICATE BY GSITEC
   Estética Moderna, Responsiva, Alto Impacto Visual (Glassmorphism & Tech)
   ==================================================================== */

:root {
    --bg-main: #0a0d14;
    --bg-card: #121824;
    --bg-card-hover: #172033;
    --bg-elevated: #1b2438;
    --border-color: rgba(255, 255, 255, 0.08);
    --border-glow: rgba(0, 229, 155, 0.3);
    
    --primary: #00e59b;
    --primary-hover: #00c985;
    --primary-light: rgba(0, 229, 155, 0.12);
    
    --secondary: #0070f3;
    --secondary-hover: #0056bd;
    --secondary-light: rgba(0, 112, 243, 0.12);

    --accent-purple: #7928ca;
    --accent-gold: #f5a623;
    --danger: #ff4d4f;
    --success: #00e59b;
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.4);
    --shadow-md: 0 8px 24px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 25px rgba(0, 229, 155, 0.15);
    --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
    position: relative;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Tipografía */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.25;
}

/* Layout Container */
.container {
    width: 100%;
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header & Navbar */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 13, 20, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: 14px 0;
}

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

.brand-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.brand-badge {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #000;
    font-size: 0.72rem;
    font-weight: 900;
    padding: 3px 8px;
    border-radius: var(--radius-sm);
    letter-spacing: 0.5px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
    list-style: none;
}

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.cart-icon-btn {
    position: relative;
    padding: 8px 12px;
    border-radius: var(--radius-md);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.cart-badge {
    position: absolute;
    top: -6px;
    right: -6px;
    background: var(--primary);
    color: #000;
    font-size: 0.75rem;
    font-weight: 800;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mobile-menu-btn {
    display: none;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 7px 11px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 1.05rem;
    transition: var(--transition);
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.mobile-menu-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.mobile-only-nav {
    display: none;
}

.header-user-badge {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Botones */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid transparent;
    transition: var(--transition);
}

.btn-primary {
    background: var(--primary);
    color: #000;
}
.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 0 20px rgba(0, 229, 155, 0.4);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--secondary);
    color: #fff;
}
.btn-secondary:hover {
    background: var(--secondary-hover);
    box-shadow: 0 0 20px rgba(0, 112, 243, 0.4);
}

.btn-outline {
    background: transparent;
    border-color: var(--border-color);
    color: var(--text-primary);
}
.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1.05rem;
}

.btn-block {
    width: 100%;
}

/* Hero Section */
.hero-section {
    padding: 80px 0 60px;
    position: relative;
    overflow: hidden;
}

.hero-glow {
    position: absolute;
    top: -120px;
    right: 20%;
    width: 450px;
    height: 450px;
    background: radial-gradient(circle, rgba(0, 229, 155, 0.15) 0%, rgba(0, 112, 243, 0.08) 50%, transparent 70%);
    filter: blur(60px);
    pointer-events: none;
}

.hero-content {
    max-width: 780px;
    margin: 0 auto;
    text-align: center;
}

.hero-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    color: var(--primary);
    margin-bottom: 24px;
}

.hero-title {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.text-gradient {
    background: linear-gradient(135deg, #fff 30%, var(--primary) 70%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 36px;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

/* Stats Strip */
.stats-strip {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 60px;
    padding: 30px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

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

.stat-value {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 6px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Section Common */
.section {
    padding: 70px 0;
}

.section-header {
    text-align: center;
    max-width: 650px;
    margin: 0 auto 48px;
}

.section-tag {
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.section-title {
    font-size: 2.2rem;
    margin-bottom: 12px;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Course Grid & Cards */
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 28px;
}

.course-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.course-card:hover {
    border-color: rgba(0, 229, 155, 0.4);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.course-card-thumb {
    position: relative;
    height: 190px;
    overflow: hidden;
}

.course-card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.course-card:hover .course-card-thumb img {
    transform: scale(1.05);
}

.course-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    background: rgba(10, 13, 20, 0.8);
    backdrop-filter: blur(8px);
    color: var(--primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.course-level {
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(0, 0, 0, 0.75);
    color: var(--text-primary);
}

.course-card-body {
    padding: 22px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.course-card-title {
    font-size: 1.18rem;
    margin-bottom: 10px;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-card-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 18px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 18px;
}

.course-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.course-card-footer {
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.course-price {
    display: flex;
    flex-direction: column;
}

.price-current {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--primary);
}

.price-old {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-decoration: line-through;
}

/* Categorías Pill Grid */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 40px;
}

.category-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 14px;
    transition: var(--transition);
}

.category-card:hover {
    border-color: var(--primary);
    background: var(--bg-card-hover);
    transform: translateY(-2px);
}

.category-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    background: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.category-info h4 {
    font-size: 0.95rem;
    margin-bottom: 2px;
}

.category-info span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Mensajes Flash y Alertas */
.alert {
    padding: 14px 18px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.95rem;
}

.alert-success {
    background: rgba(0, 229, 155, 0.12);
    border: 1px solid var(--primary);
    color: #4ade80;
}

.alert-error {
    background: rgba(255, 77, 79, 0.12);
    border: 1px solid var(--danger);
    color: #f87171;
}

.alert-warning {
    background: rgba(245, 166, 35, 0.12);
    border: 1px solid var(--accent-gold);
    color: #fbbf24;
}

.alert-info {
    background: rgba(0, 112, 243, 0.12);
    border: 1px solid var(--secondary);
    color: #60a5fa;
}

/* Formularios */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 229, 155, 0.15);
}

/* Footer */
.site-footer {
    background: #06090f;
    border-top: 1px solid var(--border-color);
    padding: 60px 0 30px;
    margin-top: 80px;
}

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

.footer-about p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 12px;
    max-width: 320px;
}

.footer-col h4 {
    font-size: 1rem;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

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

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

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.methodology-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}

.course-detail-grid {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 40px;
    align-items: start;
}

.learn-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

/* Responsividad */
@media (max-width: 992px) {
    .hero-title {
        font-size: 2.5rem;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }
    .course-detail-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }

    .site-header {
        padding: 10px 0;
    }

    .brand-logo {
        font-size: 1.15rem;
        gap: 8px;
    }

    .brand-badge {
        font-size: 0.65rem;
        padding: 2px 6px;
    }

    .mobile-menu-btn {
        display: inline-flex;
    }

    .mobile-only-nav {
        display: block;
        width: 100%;
        margin-top: 14px;
        padding-top: 14px;
        border-top: 1px solid rgba(255, 255, 255, 0.08);
    }

    .mobile-auth-btns {
        display: flex;
        flex-direction: column;
        gap: 10px;
    }

    .mobile-user-links {
        display: flex;
        flex-direction: column;
        gap: 8px;
    }

    .nav-links {
        position: fixed;
        top: 57px;
        left: 0;
        right: 0;
        background: rgba(10, 13, 20, 0.98);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        padding: 0 20px;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.25s ease, padding 0.35s ease;
        opacity: 0;
        pointer-events: none;
        z-index: 999;
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.8);
    }

    .nav-links.active {
        max-height: 520px;
        padding: 16px 20px 24px;
        opacity: 1;
        pointer-events: auto;
    }

    .nav-links li {
        width: 100%;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    .nav-links li:last-child {
        border-bottom: none;
    }

    .nav-links a {
        display: block;
        padding: 12px 4px;
        font-size: 0.98rem;
        color: var(--text-primary);
        font-weight: 500;
        transition: var(--transition);
    }

    .nav-links a:hover, .nav-links a.active {
        color: var(--primary);
        padding-left: 8px;
    }

    .nav-actions {
        gap: 8px;
    }

    .user-display-name {
        display: none;
    }
}

@media (max-width: 640px) {
    .hero-section {
        padding: 45px 0 35px;
    }

    .hero-title {
        font-size: 1.85rem;
        letter-spacing: -0.5px;
        margin-bottom: 14px;
    }

    .hero-pill {
        font-size: 0.78rem;
        padding: 5px 12px;
        margin-bottom: 18px;
        max-width: 100%;
        text-align: center;
    }

    .hero-description {
        font-size: 0.95rem;
        margin-bottom: 24px;
        line-height: 1.55;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
        gap: 12px;
    }

    .hero-actions .btn {
        width: 100%;
        padding: 12px 20px;
        font-size: 0.95rem;
    }

    .stats-strip {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
        margin-top: 35px;
        padding: 18px 12px;
    }

    .stat-value {
        font-size: 1.5rem;
    }

    .stat-label {
        font-size: 0.78rem;
    }

    .section {
        padding: 45px 0;
    }

    .section-header {
        margin-bottom: 30px;
    }

    .section-title {
        font-size: 1.65rem;
    }

    .course-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .categories-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .methodology-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .learn-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
        margin-bottom: 28px;
    }

    .footer-about p {
        max-width: 100%;
    }

    .footer-col h4 {
        margin-bottom: 10px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
}

@media (max-width: 440px) {
    .brand-logo span:first-of-type {
        font-size: 1.05rem;
    }

    .brand-badge {
        display: none;
    }

    .btn-login-header {
        display: none;
    }

    .btn-register-header {
        padding: 6px 10px;
        font-size: 0.8rem;
    }

    .cart-icon-btn {
        padding: 6px 10px;
    }

    .stats-strip {
        grid-template-columns: 1fr;
        gap: 14px;
    }
}