/* ===== CSS VARIABLES ===== */
:root {
    /* Bright & Vibrant Brand Colors */
    --primary: #8b5cf6;
    --primary-dark: #7c3aed;
    --primary-light: #a78bfa;
    --secondary: #06b6d4;
    --accent: #ec4899;
    --success: #10b981;
    --danger: #ef4444;
    --cyan: #00d4ff;
    --purple: #8b5cf6;
    --pink: #ec4899;
    --orange: #ff6b35;
    
    /* Text Colors */
    --text-primary: #1a1a2e;
    --text-secondary: #64748b;
    --text-tertiary: #64748b;
    --text-light: #94a3b8;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #fafbfc;
    --bg-tertiary: #f1f5f9;
    --bg-dark: #1a1a2e;
    
    /* Border & Surface */
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --surface: rgba(255, 255, 255, 0.9);
    --surface-hover: rgba(255, 255, 255, 0.95);
    
    /* Bright Gradients */
    --gradient-primary: linear-gradient(135deg, #8b5cf6, #06b6d4);
    --gradient-accent: linear-gradient(135deg, #ec4899, #8b5cf6);
    --gradient-bg: linear-gradient(135deg, rgba(139, 92, 246, 0.08), rgba(6, 182, 212, 0.08));
    --gradient-cyan-purple: linear-gradient(135deg, #00d4ff, #8b5cf6);
    --gradient-pink-purple: linear-gradient(135deg, #ec4899, #8b5cf6);
    --gradient-orange-pink: linear-gradient(135deg, #ff6b35, #ec4899);
    --gradient-purple-cyan: linear-gradient(135deg, #8b5cf6, #00d4ff);
    --gradient-rainbow: linear-gradient(135deg, #00d4ff, #8b5cf6, #ec4899, #ff6b35);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'Plus Jakarta Sans', sans-serif;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== RESET & BASE ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== UTILITIES ===== */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.gradient-text {
    background: var(--gradient-cyan-purple);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 700;
}

/* Enhanced gradient text variations */
.gradient-text-purple {
    background: var(--gradient-pink-purple);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 700;
}

.gradient-text-orange {
    background: var(--gradient-orange-pink);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 700;
}

.fade-in {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.section-content {
    opacity: 0;
    transform: translateY(20px);
}

.section-content.fade-in {
    opacity: 1;
    transform: translateY(0);
}

/* ===== HEADER & NAVIGATION ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--border-light);
    z-index: 1000;
    height: 80px;
}

.navbar {
    height: 100%;
    display: flex;
    align-items: center;
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    flex-shrink: 0;
}

.nav-logo {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.nav-logo::after {
    content: 'B';
    color: white;
    font-weight: 800;
    font-size: 1.25rem;
}

.brand-text {
    font-family: var(--font-heading);
    font-size: 1.375rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.025em;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    list-style: none;
}

.nav-link {
    position: relative;
    padding: 0.5rem 1rem;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: var(--transition);
    cursor: pointer;
}

.nav-link:hover {
    color: var(--primary);
    background: rgba(79, 70, 229, 0.08);
}

.nav-link.active {
    color: var(--primary);
    background: rgba(79, 70, 229, 0.1);
    font-weight: 600;
}

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

.mobile-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    cursor: pointer;
    gap: 4px;
}

.mobile-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    border-radius: var(--radius-full);
    transition: var(--transition);
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: inherit;
    font-size: 0.9375rem;
    font-weight: 600;
    line-height: 1;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-lg);
    border: none;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-cyan-purple);
    color: white;
    box-shadow: 0 10px 30px rgba(139, 92, 246, 0.4);
    border: none;
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.6s;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(139, 92, 246, 0.5);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
    position: relative;
    overflow: hidden;
}

.btn-outline::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-cyan-purple);
    transition: left 0.3s ease;
    z-index: -1;
}

.btn-outline:hover::before {
    left: 0;
}

.btn-outline:hover {
    color: white;
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(139, 92, 246, 0.3);
}

.btn-large {
    font-size: 1.125rem;
    padding: 1rem 2rem;
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.btn-ghost:hover {
    background: var(--bg-secondary);
    border-color: var(--primary);
    color: var(--primary);
}

/* ===== MAIN CONTENT ===== */
.main-content {
    margin-top: 80px;
}

.section {
    padding: 5rem 0;
}

.section-content {
    display: none;
    padding: 5rem 0;
}

.section-content.active {
    display: block;
}

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 4rem auto;
}

.section-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.2;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    letter-spacing: -0.025em;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 600px;
    margin: 0 auto;
}

/* ===== HERO SECTION ===== */
.hero {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(6, 182, 212, 0.08), rgba(236, 72, 153, 0.06));
    min-height: 90vh;
    display: flex;
    align-items: center;
    padding: 6rem 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.1) 0%, transparent 50%);
    animation: float 6s ease-in-out infinite;
    pointer-events: none;  /* CRITICAL */
    z-index: 0;  /* CRITICAL */
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -50%;
    left: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(236, 72, 153, 0.1) 0%, transparent 50%);
    animation: float 8s ease-in-out infinite reverse;
    pointer-events: none;  /* CRITICAL */
    z-index: 0;  /* CRITICAL */
}

.hero-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(79, 70, 229, 0.1);
    border: 1px solid rgba(79, 70, 229, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 2rem;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: var(--radius-full);
    animation: pulse 2s infinite;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    color: var(--text-primary);
    margin-bottom: 2rem;
    letter-spacing: -0.025em;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 2.5rem;
    max-width: 600px;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-light);
}

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

.stat-number {
    font-size: 1.875rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    font-weight: 500;
}

.hero-visual {
    position: relative;
}

.hero-card {
    background: var(--surface);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-2xl);
    padding: 2rem;
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
}

.hero-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.live-indicator {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--danger);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1.5rem;
}

.live-dot {
    width: 6px;
    height: 6px;
    background: var(--danger);
    border-radius: var(--radius-full);
    animation: pulse 1s infinite;
}

.hero-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.3;
}

.hero-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.hero-card-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* ===== COURSES SECTION ===== */
.course-tier {
    margin-bottom: 4rem;
}

.tier-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 2rem;
    position: relative;
    padding-left: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.tier-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 2rem;
}

.course-card {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-2xl);
    padding: 2rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    height: fit-content;
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary);
}

.course-card.premium {
    border: 2px solid var(--primary);
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.02), rgba(6, 182, 212, 0.01));
}

.course-card.premium::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-accent);
}

.course-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
}

.course-badge {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.course-badge.elite {
    background: var(--gradient-pink-purple);
    color: white;
    box-shadow: 0 4px 15px rgba(236, 72, 153, 0.3);
}

.course-badge.foundation {
    background: var(--gradient-cyan-purple);
    color: white;
    box-shadow: 0 4px 15px rgba(6, 182, 212, 0.3);
}

.course-badge.advanced {
    background: var(--gradient-orange-pink);
    color: white;
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
}

.course-badge.specialization {
    background: var(--gradient-purple-cyan);
    color: white;
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
}

.course-duration {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-tertiary);
    background: var(--bg-tertiary);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
}

.course-card h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.3;
}

.course-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.course-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.feature {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary);
    background: rgba(79, 70, 229, 0.1);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-md);
}

.course-pricing {
    margin-bottom: 2rem;
}

.price {
    font-size: 1.875rem;
    font-weight: 800;
    color: var(--primary);
}

.course-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.course-actions .btn {
    font-size: 0.875rem;
    padding: 0.75rem 1rem;
}

/* ===== ABOUT SECTION ===== */
.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.about-card {
    text-align: center;
    padding: 2rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.about-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.about-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.about-card h3 {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.about-card h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.about-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== MODAL STYLES ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    z-index: 2000;
    animation: fadeIn 0.3s ease;
}

.modal-overlay.active {
    display: flex;
}

.modal-container {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow: hidden;
    box-shadow: var(--shadow-2xl);
    position: relative;
    animation: slideInUp 0.3s ease;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 2rem;
    border-bottom: 1px solid var(--border-light);
}

.modal-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.modal-close {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1.25rem;
    color: var(--text-tertiary);
    cursor: pointer;
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.modal-content {
    padding: 2rem;
    overflow-y: auto;
    max-height: calc(90vh - 140px);
}

.modal-content h2 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.modal-content h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    margin: 2rem 0 1rem 0;
}

.modal-content p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.modal-content ul {
    margin: 1rem 0;
    padding-left: 2rem;
}

.modal-content li {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.chip {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--primary);
    background: rgba(79, 70, 229, 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

/* ===== WHATSAPP FLOAT ===== */
.whatsapp-float {
    position: fixed;
    bottom: 7rem;
    right: 2rem;
    width: 60px;
    height: 60px;
    background: #25d366;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    box-shadow: var(--shadow-lg);
    z-index: 998;
    transition: var(--transition);
}

.whatsapp-float:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-xl);
}

/* ===== CHATBOT WIDGET ===== */
.chatbot-widget {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 320px;
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-2xl);
    z-index: 999;
    overflow: hidden;
    transition: var(--transition);
}

.chatbot-header {
    background: var(--gradient-primary);
    color: white;
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    user-select: none;
}

.chatbot-avatar {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
}

.chatbot-info {
    flex: 1;
}

.chatbot-name {
    font-weight: 600;
    font-size: 0.9rem;
}

.chatbot-status {
    font-size: 0.75rem;
    opacity: 0.8;
}

.chatbot-toggle {
    transition: var(--transition);
}

.chatbot-body {
    height: 0;
    overflow: hidden;
    transition: height 0.3s ease;
}

.chatbot-widget.open .chatbot-body {
    height: 400px;
}

.chatbot-widget.open .chat-icon {
    display: none;
}

.chatbot-widget.open .close-icon {
    display: block !important;
}

.chatbot-messages {
    height: 340px;
    overflow-y: auto;
    padding: 1rem;
    background: var(--bg-secondary);
}

.message {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.message-avatar {
    width: 30px;
    height: 30px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    flex-shrink: 0;
}

.bot-message .message-avatar {
    background: var(--primary);
    color: white;
}

.user-message {
    flex-direction: row-reverse;
}

.user-message .message-avatar {
    background: var(--secondary);
    color: white;
}

.message-content {
    background: white;
    padding: 0.75rem;
    border-radius: var(--radius-lg);
    max-width: 80%;
    box-shadow: var(--shadow-sm);
}

.user-message .message-content {
    background: var(--primary);
    color: white;
}

.message-content p {
    margin: 0;
    font-size: 0.875rem;
    line-height: 1.4;
}

.chatbot-input {
    padding: 1rem;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 0.5rem;
}

.chatbot-input input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    outline: none;
}

.chatbot-input input:focus {
    border-color: var(--primary);
}

.chatbot-input button {
    padding: 0.75rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition);
}

.chatbot-input button:hover {
    background: var(--primary-dark);
}

/* ===== ANIMATIONS ===== */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideInUp {
    from { 
        opacity: 0;
        transform: translateY(50px) scale(0.95);
    }
    to { 
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1024px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background: var(--surface-hover);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--border-light);
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 1.5rem 0;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-link {
        padding: 1rem 1.5rem;
        border-radius: 0;
        text-align: center;
    }

    .mobile-toggle {
        display: flex;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }

    .hero-stats {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .chatbot-widget {
        width: 280px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }

    .section {
        padding: 3rem 0;
    }

    .section-content {
        padding: 3rem 0;
    }

    .hero {
        padding: 4rem 0;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .btn-large {
        width: 100%;
        max-width: 300px;
    }

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

    .course-actions {
        grid-template-columns: 1fr;
    }

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

    .modal-container {
        margin: 1rem;
    }

    .modal-header,
    .modal-content {
        padding: 1.5rem;
    }

    .chatbot-widget {
        width: calc(100vw - 2rem);
        right: 1rem;
        left: 1rem;
    }

    .whatsapp-float {
        bottom: 8rem;
        right: 1rem;
        width: 56px;
        height: 56px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 0.75rem;
    }

    .hero-title {
        font-size: clamp(1.875rem, 8vw, 3rem);
    }

    .hero-card {
        padding: 1.5rem;
    }

    .course-card {
        padding: 1.5rem;
    }

    .chatbot-widget {
        bottom: 1rem;
        right: 1rem;
        left: 1rem;
        width: calc(100vw - 2rem);
    }

    .whatsapp-float {
        bottom: 7rem;
        right: 1rem;
        width: 50px;
        height: 50px;
    }

    .whatsapp-float svg {
        width: 24px;
        height: 24px;
    }
}

/* Video Modal */
.video-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10000;
    align-items: center;
    justify-content: center;
}

.video-modal.active {
    display: flex;
}

.video-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(8px);
}

.video-modal-content {
    position: relative;
    width: 90%;
    max-width: 1200px;
    z-index: 10001;
}

.video-close {
    position: absolute;
    top: -50px;
    right: 0;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid white;
    border-radius: 50%;
    color: white;
    font-size: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.video-close:hover {
    background: white;
    color: black;
    transform: rotate(90deg);
}

.video-container {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
    background: black;
    border-radius: var(--radius-xl);
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Mobile responsive */
@media (max-width: 768px) {
    .video-modal-content {
        width: 95%;
    }
    
    .video-close {
        top: -40px;
        width: 35px;
        height: 35px;
        font-size: 20px;
    }
}

/* Video embed in hero card */
.video-embed {
    width: 100%;
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: var(--radius-lg);
    margin-bottom: 1rem;
}

.video-embed iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}
/* MOBILE VIDEO FIX - Force buttons clickable */
.hero-card button,
.hero-card-actions button,
#watchDemoBtn,
#backButton {
    pointer-events: auto !important;
    position: relative !important;
    z-index: 100 !important;
    touch-action: manipulation !important;
}