/*
=========================================================================
   SPEAKK.LIVE - LANDING PAGE STYLES
   Complete CSS for index.html landing page
   Modern, responsive design with smooth animations
=========================================================================
*/

/* =========================================================================
   SEÇÃO 1: CSS VARIABLES & RESET
   ========================================================================= */

:root {
    /* Primary Colors */
    --primary-color: #667eea;
    --primary-dark: #5a6fd8;
    --primary-light: #8b9aed;
    --secondary-color: #764ba2;
    --accent-color: #ff6b6b;
    --success-color: #51cf66;
    --warning-color: #ffd43b;
    --error-color: #ff6b6b;
    
    /* Neutral Colors */
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    --gradient-text: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    
    /* Layout */
    --container-max-width: 1200px;
    --header-height: 80px;
    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    
    /* 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), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--gray-700);
    background-color: var(--white);
    overflow-x: hidden;
}

/* =========================================================================
   SEÇÃO 2: TYPOGRAPHY & BASE STYLES
   ========================================================================= */

h1, h2, h3, h4, h5, h6 {
    color: var(--gray-900);
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl); }
h6 { font-size: var(--font-size-lg); }

p {
    margin-bottom: var(--spacing-md);
    color: var(--gray-600);
}

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

a:hover {
    color: var(--primary-dark);
}

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-4xl);
}

.section-title {
    margin-bottom: var(--spacing-md);
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--gray-500);
    max-width: 600px;
    margin: 0 auto;
}

.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* =========================================================================
   SEÇÃO 3: BUTTONS
   ========================================================================= */

.btn-primary,
.btn-secondary,
.btn-outline,
.btn-login,
.btn-signup,
.btn-plan {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    font-weight: 500;
    font-size: var(--font-size-base);
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
    min-height: 48px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: var(--shadow-lg);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    color: var(--white);
}

.btn-secondary {
    background: var(--white);
    color: var(--gray-700);
    border: 2px solid var(--gray-200);
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

.btn-outline:hover {
    background: var(--white);
    color: var(--primary-color);
}

.btn-login {
    background: transparent;
    color: var(--gray-600);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
}

.btn-login:hover {
    color: var(--primary-color);
}

.btn-signup {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-signup:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
    color: var(--white);
}

.btn-plan {
    width: 100%;
    background: var(--gradient-primary);
    color: var(--white);
}

.btn-plan:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--white);
}

/* =========================================================================
   SEÇÃO 4: NAVIGATION
   ========================================================================= */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.nav-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--gray-900);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-2xl);
}

.nav-link {
    color: var(--gray-600);
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
    padding: var(--spacing-sm) 0;
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-normal);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-auth {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
    padding: var(--spacing-sm);
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--gray-700);
    border-radius: 2px;
    transition: all var(--transition-normal);
}

/* =========================================================================
   SEÇÃO 5: HERO SECTION
   ========================================================================= */

.hero {
    background: var(--gradient-hero);
    padding: calc(var(--header-height) + var(--spacing-4xl)) 0 var(--spacing-4xl);
    position: relative;
    overflow: hidden;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
    align-items: center;
}

.hero-content {
    color: var(--white);
}

.hero-title {
    font-size: var(--font-size-6xl);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-xl);
    color: var(--white);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-2xl);
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
}

.hero-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: rgba(255, 255, 255, 0.9);
    font-size: var(--font-size-sm);
    background: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    backdrop-filter: blur(10px);
}

.feature-item i {
    font-size: var(--font-size-lg);
    color: var(--warning-color);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-3xl);
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-2xl);
    flex-wrap: wrap;
}

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

.stat-number {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--warning-color);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.8);
}

/* Hero Demo */
.hero-demo {
    position: relative;
}

.demo-container {
    position: relative;
}

.demo-screen {
    background: var(--white);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-2xl);
    overflow: hidden;
    animation: float 6s ease-in-out infinite;
}

.demo-header {
    background: var(--gray-100);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    border-bottom: 1px solid var(--gray-200);
}

.demo-controls {
    display: flex;
    gap: var(--spacing-xs);
}

.control-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.control-dot.red { background: #ff5f56; }
.control-dot.yellow { background: #ffbd2e; }
.control-dot.green { background: #27ca3f; }

.demo-title {
    font-weight: 600;
    color: var(--gray-700);
    font-size: var(--font-size-sm);
}

.demo-content {
    padding: var(--spacing-lg);
}

.demo-section {
    margin-bottom: var(--spacing-lg);
}

.demo-section:last-child {
    margin-bottom: 0;
}

.demo-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xs);
    color: var(--gray-500);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.demo-text {
    background: var(--gray-50);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-sm);
    line-height: 1.5;
    border-left: 3px solid var(--primary-color);
}

.demo-text.ai-response {
    border-left-color: var(--success-color);
    background: #f0fdf4;
}

.live-pulse {
    color: var(--error-color);
    animation: pulse 2s infinite;
}

.audio-visualizer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 3px;
    padding: var(--spacing-md);
    background: var(--gray-50);
    border-radius: var(--border-radius-md);
    margin-top: var(--spacing-md);
}

.audio-bar {
    width: 4px;
    background: var(--primary-color);
    border-radius: 2px;
    animation: audioWave 1.5s ease-in-out infinite;
}

.audio-bar:nth-child(1) { height: 10px; animation-delay: 0s; }
.audio-bar:nth-child(2) { height: 20px; animation-delay: 0.1s; }
.audio-bar:nth-child(3) { height: 15px; animation-delay: 0.2s; }
.audio-bar:nth-child(4) { height: 25px; animation-delay: 0.3s; }
.audio-bar:nth-child(5) { height: 18px; animation-delay: 0.4s; }
.audio-bar:nth-child(6) { height: 12px; animation-delay: 0.5s; }
.audio-bar:nth-child(7) { height: 22px; animation-delay: 0.6s; }
.audio-bar:nth-child(8) { height: 16px; animation-delay: 0.7s; }

.floating-element {
    position: absolute;
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: var(--font-size-xl);
    animation: floatRandom 8s ease-in-out infinite;
}

.float-1 {
    top: 10%;
    right: 10%;
    animation-delay: 0s;
}

.float-2 {
    top: 60%;
    right: 80%;
    animation-delay: 2s;
}

.float-3 {
    bottom: 20%;
    right: 20%;
    animation-delay: 4s;
}

/* =========================================================================
   SEÇÃO 6: FEATURES SECTION
   ========================================================================= */

.features {
    padding: var(--spacing-4xl) 0;
    background: var(--gray-50);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-2xl);
}

.feature-card {
    background: var(--white);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border: 1px solid var(--gray-200);
    height: 100%;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
    color: var(--white);
    font-size: var(--font-size-xl);
}

.feature-title {
    margin-bottom: var(--spacing-md);
    color: var(--gray-900);
    font-size: var(--font-size-xl);
}

.feature-description {
    margin-bottom: var(--spacing-lg);
    color: var(--gray-600);
    line-height: 1.6;
}

.feature-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    color: var(--gray-700);
    font-size: var(--font-size-sm);
}

.feature-list li:last-child {
    margin-bottom: 0;
}

.feature-list i {
    color: var(--success-color);
    font-size: var(--font-size-sm);
    flex-shrink: 0;
}

/* =========================================================================
   SEÇÃO 7: HOW IT WORKS
   ========================================================================= */

.how-it-works {
    padding: var(--spacing-4xl) 0;
    background: var(--white);
}

.steps-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2xl);
    max-width: 1000px;
    margin: 0 auto;
}

.step-item {
    flex: 1;
    text-align: center;
    position: relative;
}

.step-number {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--white);
    margin: 0 auto var(--spacing-lg);
    box-shadow: var(--shadow-lg);
}

.step-content h3 {
    margin-bottom: var(--spacing-md);
    color: var(--gray-900);
}

.step-content p {
    color: var(--gray-600);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.step-visual {
    font-size: var(--font-size-3xl);
    color: var(--primary-color);
    margin-top: var(--spacing-lg);
}

.step-arrow {
    font-size: var(--font-size-xl);
    color: var(--gray-400);
    flex-shrink: 0;
}

/* =========================================================================
   SEÇÃO 8: PRICING
   ========================================================================= */

.pricing {
    padding: var(--spacing-4xl) 0;
    background: var(--gray-50);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-2xl);
    max-width: 1000px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--white);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    position: relative;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.pricing-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.pricing-card.featured {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-5px);
}

.plan-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-primary);
    color: var(--white);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.plan-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-200);
}

.plan-name {
    margin-bottom: var(--spacing-md);
    color: var(--gray-900);
    font-size: var(--font-size-2xl);
}

.plan-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.currency {
    font-size: var(--font-size-lg);
    color: var(--gray-600);
}

.amount {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    color: var(--gray-900);
    margin: 0 4px;
}

.period {
    color: var(--gray-600);
}

.plan-description {
    color: var(--gray-500);
    margin: 0;
}

.plan-features {
    flex: 1;
    margin-bottom: var(--spacing-2xl);
}

.plan-features ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.plan-features li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    color: var(--gray-700);
}

.plan-features i.fa-check {
    color: var(--success-color);
}

.plan-features i.fa-times {
    color: var(--gray-400);
}

.plan-action {
    margin-top: auto;
}

/* =========================================================================
   SEÇÃO 9: CTA SECTION
   ========================================================================= */

.cta {
    padding: var(--spacing-4xl) 0;
    background: var(--gradient-primary);
    color: var(--white);
    text-align: center;
}

.cta-content h2 {
    color: var(--white);
    margin-bottom: var(--spacing-lg);
}

.cta-subtitle {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-2xl);
    color: rgba(255, 255, 255, 0.9);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

.cta-guarantee {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    color: rgba(255, 255, 255, 0.8);
    font-size: var(--font-size-sm);
}

.cta-guarantee i {
    font-size: var(--font-size-lg);
    color: var(--success-color);
}

/* =========================================================================
   SEÇÃO 10: FOOTER
   ========================================================================= */

.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: var(--spacing-4xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr repeat(4, 1fr);
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h4 {
    color: var(--white);
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-lg);
}

.footer-logo {
    margin-bottom: var(--spacing-lg);
}

.footer-description {
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
}

.footer-social a {
    width: 40px;
    height: 40px;
    background: var(--gray-800);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-400);
    transition: all var(--transition-normal);
}

.footer-social a:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: var(--gray-400);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    border-top: 1px solid var(--gray-800);
    padding-top: var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--gray-500);
}

.footer-copyright p,
.footer-meta p {
    margin: 0;
}

/* =========================================================================
   SEÇÃO 11: MODAL
   ========================================================================= */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--white);
    border-radius: var(--border-radius-xl);
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-2xl);
    transform: scale(0.9);
    transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-content {
    transform: scale(1);
}

.modal-header {
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
    color: var(--gray-900);
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--font-size-xl);
    color: var(--gray-500);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--gray-100);
    color: var(--gray-700);
}

.modal-body {
    padding: var(--spacing-xl);
}

.video-container {
    aspect-ratio: 16/9;
    background: var(--gray-100);
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
}

/* =========================================================================
   SEÇÃO 12: RESPONSIVE DESIGN
   ========================================================================= */

/* Tablet */
@media (max-width: 768px) {
    :root {
        --font-size-6xl: 2.5rem;
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
        --spacing-4xl: 3rem;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    /* Navigation */
    .nav-menu {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-auth {
        gap: var(--spacing-sm);
    }
    
    .btn-login,
    .btn-signup {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-sm);
    }
    
    /* Hero */
    .hero {
        padding: calc(var(--header-height) + var(--spacing-2xl)) 0 var(--spacing-2xl);
        min-height: auto;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
        text-align: center;
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .demo-screen {
        max-width: 400px;
        margin: 0 auto;
    }
    
    /* Features */
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    /* Steps */
    .steps-container {
        flex-direction: column;
        gap: var(--spacing-xl);
    }
    
    .step-arrow {
        transform: rotate(90deg);
    }
    
    /* Pricing */
    .pricing-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .pricing-card.featured {
        transform: none;
    }
    
    .pricing-card.featured:hover {
        transform: translateY(-5px);
    }
    
    /* Footer */
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        text-align: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}

/* Mobile */
@media (max-width: 480px) {
    :root {
        --font-size-6xl: 2rem;
        --font-size-5xl: 1.75rem;
        --font-size-4xl: 1.5rem;
        --spacing-4xl: 2rem;
        --spacing-3xl: 1.5rem;
        --spacing-2xl: 1rem;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    /* Navigation */
    .nav-container {
        padding: 0 var(--spacing-md);
    }
    
    .nav-auth {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
    
    /* Hero */
    .hero-features {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-sm);
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-md);
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    /* Demo */
    .demo-content {
        padding: var(--spacing-md);
    }
    
    .demo-section {
        margin-bottom: var(--spacing-md);
    }
    
    /* CTA */
    .cta-actions {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-md);
    }
    
    .cta-guarantee {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }
    
    /* Modal */
    .modal-overlay {
        padding: var(--spacing-md);
    }
    
    .modal-header,
    .modal-body {
        padding: var(--spacing-lg);
    }
}

/* =========================================================================
   SEÇÃO 13: ANIMATIONS & EFFECTS
   ========================================================================= */

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

@keyframes floatRandom {
    0%, 100% { transform: translateY(0px) translateX(0px); }
    25% { transform: translateY(-15px) translateX(10px); }
    50% { transform: translateY(-25px) translateX(-5px); }
    75% { transform: translateY(-10px) translateX(-15px); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes audioWave {
    0%, 100% { transform: scaleY(1); }
    50% { transform: scaleY(2); }
}

/* Scroll Animations */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Hover Effects */
.hover-lift {
    transition: transform var(--transition-normal);
}

.hover-lift:hover {
    transform: translateY(-5px);
}

.hover-scale {
    transition: transform var(--transition-normal);
}

.hover-scale:hover {
    transform: scale(1.05);
}

/* Focus States */
button:focus,
a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Selection */
::selection {
    background: var(--primary-color);
    color: var(--white);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--gray-400);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500);
}

/* Print Styles */
@media print {
    .navbar,
    .hero-demo,
    .floating-element,
    .modal-overlay {
        display: none !important;
    }
    
    body {
        color: black !important;
        background: white !important;
    }
    
    .hero {
        background: white !important;
        color: black !important;
    }
    
    .hero-title,
    .hero-subtitle {
        color: black !important;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0000ff;
        --gray-600: #000000;
        --gray-700: #000000;
        --gray-900: #000000;
    }
}

/* Dark Theme Support (Future) */
@media (prefers-color-scheme: dark) {
    /* Ready for dark mode implementation */
}