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

:root {
    /* Spacing & Layout */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;
    --border-radius: 0.75rem;
    --border-radius-lg: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 2px 4px -1px rgba(0, 0, 0, 0.06), 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 6px -2px rgba(0, 0, 0, 0.05), 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-card: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-card-hover: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    
    /* Accent Colors (theme-independent) */
    --accent-primary: #2563eb;
    --accent-primary-dark: #1e40af;
    --accent-primary-light: #3b82f6;
    --accent-danger: #dc2626;
}

/* Dark Theme (Default) - applies when no data-theme or data-theme="dark" */
html:not([data-theme="light"]),
html[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --text-muted: #64748b;
    --card-bg: #1e293b;
    --card-border: #334155;
    --card-border-hover: #475569;
    --nav-bg: #0f172a;
    --nav-border: #1e293b;
    --footer-bg: #0a0f1a;
    --footer-text: #cbd5e1;
    --footer-text-muted: #94a3b8;
    --badge-bg: #1e293b;
    --badge-text: #cbd5e1;
    --comparison-negative-border: #475569;
    --comparison-positive-border: var(--accent-primary);
    --white: #ffffff;
    --black: #0f172a;
    
    /* Adjust shadows for dark mode */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 2px 4px -1px rgba(0, 0, 0, 0.4), 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 6px -2px rgba(0, 0, 0, 0.4), 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    --shadow-card: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-card-hover: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
}

/* Light Theme (Only when explicitly set) - must come after dark theme for specificity */
html[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f5f9ff;
    --text-primary: #0f172a;
    --text-secondary: #334155; /* Melhorado contraste: 4.5:1 sobre branco */
    --text-tertiary: #475569; /* Melhorado contraste: 4.2:1 sobre branco */
    --text-muted: #94a3b8;
    --card-bg: #ffffff;
    --card-border: #e2e8f0;
    --card-border-hover: #cbd5e1;
    --nav-bg: #ffffff;
    --nav-border: #e2e8f0;
    --footer-bg: #0f172a;
    --footer-text: #cbd5e1;
    --footer-text-muted: #94a3b8; /* Melhorado contraste sobre footer-bg */
    --badge-bg: #f1f5f9;
    --badge-text: #334155; /* Melhorado contraste */
    --comparison-negative-border: #bfdbfe;
    --comparison-positive-border: var(--accent-primary);
    --white: #ffffff;
    --black: #0f172a;
    
    /* Light theme shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 2px 4px -1px rgba(0, 0, 0, 0.06), 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 6px -2px rgba(0, 0, 0, 0.05), 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-card: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-card-hover: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    font-size: 16px;
    line-height: 1.5; /* Padronizado */
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    width: 100%;
}

/* Navigation Bar */
/* Calculate navbar height: padding (1rem top + 1rem bottom) + logo line-height (~1.875rem) + border (1px) ≈ 4rem */
.navbar {
    --navbar-height: calc(var(--spacing-sm) * 2 + 1.875rem + 1px);
    background-color: var(--nav-bg);
    border-bottom: 1px solid var(--nav-border);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

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

.logo {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: color 0.3s ease;
}

.logo-accent {
    color: var(--accent-primary);
}

.nav-menu {
    display: flex;
    list-style: none;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.2s;
}

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

.nav-link:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
    border-radius: var(--border-radius);
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.2s;
}

.nav-menu a:hover {
    color: var(--text-primary);
}

.nav-menu a:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
    border-radius: var(--border-radius);
}

/* Menu Toggle (Hamburger) */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    width: 44px;
    height: 44px;
    min-width: 44px;
    min-height: 44px;
    justify-content: center;
    align-items: center;
    color: var(--text-primary);
    transition: color 0.2s ease;
}

.menu-toggle:hover {
    color: var(--accent-primary);
}

.menu-toggle:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
    border-radius: var(--border-radius);
}

.menu-toggle-icon {
    width: 24px;
    height: 2px;
    background-color: currentColor;
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.menu-toggle[aria-expanded="true"] .menu-toggle-icon:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle[aria-expanded="true"] .menu-toggle-icon:nth-child(2) {
    opacity: 0;
}

.menu-toggle[aria-expanded="true"] .menu-toggle-icon:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

.btn-primary-nav {
    background-color: var(--accent-primary);
    color: var(--white) !important;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius);
    transition: background-color 0.2s;
}

.btn-primary-nav:hover {
    background-color: var(--accent-primary-dark);
}

.btn-primary-nav:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Theme Toggle Button */
.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: color 0.2s ease, transform 0.1s ease;
    border-radius: var(--border-radius);
    width: 36px;
    height: 36px;
}

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

.theme-toggle:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

.theme-icon {
    width: 20px;
    height: 20px;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.theme-icon-light {
    display: block;
}

.theme-icon-dark {
    display: none;
}

[data-theme="dark"] .theme-icon-light {
    display: none;
}

[data-theme="dark"] .theme-icon-dark {
    display: block;
}

/* Hero Section */
.hero {
    padding: var(--spacing-xl) 0 var(--spacing-xl);
    background-color: var(--bg-primary);
    transition: background-color 0.3s ease;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-text {
    text-align: left;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--badge-bg);
    border-radius: 9999px;
    font-size: 0.875rem;
    color: var(--badge-text);
    margin-bottom: var(--spacing-lg);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    background-color: var(--bg-secondary);
    transition: background-color 0.3s ease;
}

.hero-img {
    max-width: 100%;
    height: auto;
    object-fit: contain;
    border-radius: var(--border-radius-lg);
    display: block;
    background-color: var(--bg-secondary);
    transition: background-color 0.3s ease;
}

/* Chat Demo Styles */
.chat-demo {
    width: 100%;
    max-width: 100%;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-card);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.chat-message {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.chat-message-ai {
    flex-direction: row;
}

.chat-message-avatar {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.chat-message-user .chat-message-avatar {
    background-color: var(--accent-primary);
    color: var(--white);
}

.chat-message-ai .chat-message-avatar {
    background-color: var(--bg-tertiary);
    color: var(--accent-primary);
}

.chat-message-avatar svg {
    width: 18px;
    height: 18px;
}

.chat-message-content {
    flex: 1;
    min-width: 0;
}

.chat-message-text {
    color: var(--text-primary);
    font-size: 0.9375rem;
    line-height: 1.6;
    word-wrap: break-word;
    transition: color 0.3s ease;
}

.chat-message-user .chat-message-text {
    color: var(--text-primary);
}

.chat-message-ai .chat-message-text {
    color: var(--text-primary);
}

/* Typewriter cursor effect - only show when typing */
.chat-message-text.typing::after {
    content: '|';
    animation: blink 1s infinite;
    color: var(--accent-primary);
    margin-left: 2px;
}

@keyframes blink {
    0%, 50% {
        opacity: 1;
    }
    51%, 100% {
        opacity: 0;
    }
}

.hero-badge-dot {
    width: 8px;
    height: 8px;
    background-color: var(--accent-primary);
    border-radius: 50%;
    display: inline-block;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0;
    line-height: 1.2; /* Títulos mantêm line-height menor */
    transition: color 0.3s ease;
}

.hero-subtitle {
    font-size: 2.75rem;
    font-weight: 700;
    color: var(--accent-primary);
    display: block;
    margin-top: 0.1rem;
    letter-spacing: -0.02em;
}

.hero-description {
    font-size: 1.5rem;
    color: var(--text-primary);
    max-width: 100%;
    margin: var(--spacing-xl) 0 var(--spacing-lg);
    line-height: 1.5; /* Padronizado */
    font-weight: 400;
    transition: color 0.3s ease;
}

.hero-supporting {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 100%;
    margin: 0 0 var(--spacing-xl);
    line-height: 1.5; /* Padronizado */
    font-weight: 400;
    transition: color 0.3s ease;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-start;
    margin-top: var(--spacing-xl);
}

.btn-primary {
    background-color: var(--accent-primary);
    color: var(--white);
    padding: 0.875rem 2rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: background-color 0.2s ease, transform 0.1s ease;
    display: inline-block;
    border: none;
}

.btn-primary:hover {
    background-color: var(--accent-primary-dark);
    transform: translateY(-1px);
}

.btn-primary:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background-color: var(--card-bg);
    color: var(--text-secondary);
    padding: 0.875rem 2rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9375rem;
    border: 1.5px solid var(--card-border);
    transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
    display: inline-block;
}

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

.btn-secondary:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

.btn-secondary:active {
    transform: translateY(0);
}

/* Section Styles */
.section {
    padding: var(--spacing-2xl) 0;
}

.section + .section {
    margin-top: 0;
}

.section-gray {
    background-color: var(--bg-tertiary);
    transition: background-color 0.3s ease;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
    transition: color 0.3s ease;
}

.section-subtitle {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    text-align: center;
    max-width: 640px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.5; /* Padronizado */
    font-weight: 400;
    transition: color 0.3s ease;
}

.section-intro {
    font-size: 1.125rem;
    color: var(--text-secondary);
    text-align: center;
    max-width: 680px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.5; /* Padronizado */
    font-weight: 400;
    transition: color 0.3s ease;
}

/* Cards Grid */
.cards-grid {
    display: grid;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    align-items: stretch;
}

.cards-grid-2x2 {
    grid-template-columns: repeat(2, 1fr);
}

.cards-grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.card {
    background-color: var(--card-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--card-border);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease, background-color 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-card-hover);
    border-color: var(--card-border-hover);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.3; /* Padronizado para títulos */
    transition: color 0.3s ease;
}

.card-text {
    color: var(--text-secondary);
    line-height: 1.5; /* Padronizado */
    max-width: 100%;
    flex-grow: 1;
    transition: color 0.3s ease;
}

/* Feature Cards Grid */
.cards-grid-2cols {
    grid-template-columns: repeat(2, 1fr);
}

.card-feature {
    background-color: var(--card-bg);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--card-border);
    text-align: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease, background-color 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.card-feature:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-card-hover);
    border-color: var(--card-border-hover);
}

.card-feature-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.3; /* Padronizado para títulos */
    transition: color 0.3s ease;
}

.card-feature-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5; /* Já padronizado */
    flex-grow: 1;
    transition: color 0.3s ease;
}

/* Comparison Section */
.comparison {
    display: grid;
    grid-template-columns: 0.85fr 1.15fr;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.comparison-panel {
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
}

.comparison-panel {
    background-color: var(--card-bg);
    transition: background-color 0.3s ease;
}

.comparison-panel-negative {
    border: 1px solid var(--comparison-negative-border);
    box-shadow: 0 1px 3px 0 rgba(37, 99, 235, 0.1);
}

.comparison-panel-positive {
    border: 2px solid var(--comparison-positive-border);
    box-shadow: 0 1px 3px 0 rgba(37, 99, 235, 0.1);
}

.comparison-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.01em;
    transition: color 0.3s ease;
}

.comparison-panel-negative .comparison-title {
    color: var(--accent-danger);
}

.comparison-panel-positive .comparison-title {
    color: var(--accent-primary);
    font-size: 1.75rem;
    text-align: center;
}

.comparison-list {
    list-style: none;
    padding: 0;
}

.comparison-list li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--text-secondary);
    line-height: 1.5; /* Padronizado */
    font-size: 0.9375rem;
    transition: color 0.3s ease;
}

.comparison-panel-positive .comparison-list li {
    font-size: 1.0625rem;
}

.comparison-list li::before {
    content: "\2022";  /* Unicode bullet point (U+2022) - safer encoding */
    position: absolute;
    left: 0;
    color: var(--text-muted);
    font-weight: bold;
    font-size: 1.25rem;
    line-height: 1.2;
    transition: color 0.3s ease;
}

.comparison-panel-negative .comparison-list li::before {
    color: var(--accent-danger);
}

.comparison-panel-positive .comparison-list li::before {
    color: var(--accent-primary);
}

/* Footer */
.footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    padding: var(--spacing-2xl) 0;
    margin-top: var(--spacing-2xl);
    border-top: 1px solid var(--card-border);
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.footer-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.footer-text {
    font-size: 1rem;
    margin-bottom: var(--spacing-lg);
    line-height: 1.5; /* Padronizado */
    color: var(--footer-text);
    transition: color 0.3s ease;
}

.footer-disclaimer {
    font-size: 0.875rem;
    color: var(--footer-text-muted);
    line-height: 1.5; /* Padronizado */
    font-weight: 400;
    transition: color 0.3s ease;
}

.footer-disclaimer a {
    color: var(--footer-text);
    text-decoration: underline;
    transition: color 0.3s ease;
}

.footer-disclaimer a:hover {
    color: var(--accent-primary-light);
}

/* Responsive Design */
/* Tablet breakpoint */
@media (max-width: 968px) and (min-width: 769px) {
    .cards-grid-2x2 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cards-grid-2cols {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cards-grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .comparison {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        text-align: center;
    }

    .hero-text {
        text-align: center;
    }

    .hero-description,
    .hero-supporting {
        margin-left: auto;
        margin-right: auto;
        max-width: 680px;
    }

    .hero-cta {
        justify-content: center;
        flex-direction: column;
        align-items: center;
        gap: 0.75rem;
    }

    .cards-grid-2x2,
    .cards-grid-3 {
        grid-template-columns: 1fr;
    }

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

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.5rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
        max-width: 100%;
    }
}

/* Mobile menu styles */
@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: var(--navbar-height, 4rem);
        left: 0;
        right: 0;
        background-color: var(--nav-bg);
        border-bottom: 1px solid var(--nav-border);
        flex-direction: column;
        align-items: stretch;
        padding: var(--spacing-md);
        gap: var(--spacing-sm);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s ease;
        z-index: 99;
    }
    
    .nav-menu[aria-hidden="false"] {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-menu li {
        width: 100%;
    }
    
    .nav-menu a,
    .nav-link {
        display: block;
        padding: 0.875rem var(--spacing-md);
        width: 100%;
        text-align: center;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .btn-primary-nav {
        width: 100%;
        text-align: center;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .nav-menu .theme-toggle {
        width: 44px;
        height: 44px;
        min-width: 44px;
        min-height: 44px;
    }

    .chat-demo {
        padding: var(--spacing-md);
        gap: var(--spacing-md);
    }

    .chat-message-text {
        font-size: 0.875rem;
    }

    .chat-message-avatar {
        width: 28px;
        height: 28px;
    }

    .chat-message-avatar svg {
        width: 16px;
        height: 16px;
    }
}

@media (max-width: 640px) {
    .nav-menu {
        font-size: 0.875rem;
    }

    .hero {
        padding: var(--spacing-lg) 0 var(--spacing-xl);
    }

    .hero-title {
        font-size: 1.75rem; /* Reduzido de 2rem */
    }

    .hero-subtitle {
        font-size: 1.125rem; /* Reduzido de 1.25rem */
    }

    .hero-description {
        font-size: 1rem; /* Reduzido de 1.125rem */
    }
    
    .hero-supporting {
        font-size: 0.9375rem;
    }

    .section {
        padding: var(--spacing-lg) 0;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    .card-feature {
        min-width: 200px;
    }

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

    .chat-demo {
        padding: var(--spacing-sm);
        gap: var(--spacing-sm);
    }

    .chat-message-text {
        font-size: 0.8125rem;
    }
}

@media (max-width: 400px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .logo {
        font-size: 1.125rem;
    }
}