:root {
    /* Cores Primárias */
    --primary-color: #00AFFF;
    --primary-dark: #008FCC;
    --primary-light: #33CFFF;
    --primary-hover: #009EEF;
    --primary-active: #1976C2;
    --secondary-color: #0A1628; 
    --accent-color: #00F5FF;
    --accent-hover: #00E0EE;

    /* Cores de Texto */
    --text-primary: #E8E8E8;
    --text-secondary: #B8C8D8;
    --text-tertiary: #8A9BA8;
    --text-light: #6B7A87;
    --text-on-primary: #FFFFFF;
    --text-on-accent: #0A1628;
    --text-disabled: #5D6B78;

    /* Cores de fundo */
    --bg-primary: #0F1419;
    --bg-secondary: #1A1F26;
    --bg-tertiary: #252B33;
    --bg-quaternary: #30363D;
    --bg-dark: #0A0E13;
    --bg-light: #1F242B;
    --bg-overlay: rgba(15, 20, 25, 0.95);

    /* Cores de estado */
    --success-color: #10B981;
    --success-hover: #059669;
    --warning-color: #F59E0B;
    --warning-hover: #D97706;
    --error-color: #EF4444;
    --error-hover: #DC2626;
    --info-color: #3B82F6;
    --info-hover: #2563EB;

    /* Cores de borda e sombra */
    --border-color: #2A3038;
    --border-color-light: #3A4048;
    --border-color-dark: #1A2026;
    --border-width: 1px;
    --border-radius: var(--border-radius-md);

    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.8);
    --shadow-inset: inset 0 2px 4px rgba(0, 0, 0, 0.2);
    
    /* Glassmorphism */
    --glass-bg: rgba(15, 20, 25, 0.75);
    --glass-bg-strong: rgba(15, 20, 25, 0.85);
    --glass-bg-weak: rgba(15, 20, 25, 0.65);
    --glass-border: rgba(42, 48, 56, 0.3);
    --glass-backdrop: blur(12px);

    /* Cabeçalho Glassmorphism */
    --header-bg: var(--glass-bg-strong);
    --header-bg-scrolled: var(--glass-bg-strong);
    --header-border: var(--glass-border);
    --header-backdrop: var(--glass-backdrop);
    --dropdown-bg: var(--glass-bg);
    --dropdown-border: var(--glass-border);
    --dropdown-backdrop: var(--glass-backdrop);
    --language-toggle-bg: rgba(26, 31, 38, 0.9);

    /* Tipografia */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-secondary: system-ui, -apple-system, sans-serif;
    --font-mono: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;

    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;

    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-base: 1rem;     /* 16px */
    --font-size-lg: 1.125rem;   /* 18px */
    --font-size-xl: 1.25rem;    /* 20px */
    --font-size-2xl: 1.5rem;    /* 24px */
    --font-size-3xl: 1.875rem;  /* 30px */
    --font-size-4xl: 2.25rem;   /* 36px */
    --font-size-5xl: 3rem;      /* 48px */
    --font-size-6xl: 3.75rem;   /* 60px */

    --line-height-tight: 1.25;
    --line-height-snug: 1.375;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    --line-height-loose: 2;

    /* Espaçamentos */
    --spacing-3xs: 0.125rem;  /* 2px */
    --spacing-2xs: 0.25rem;   /* 4px */
    --spacing-xs: 0.5rem;     /* 8px */
    --spacing-sm: 0.75rem;    /* 12px */
    --spacing-md: 1rem;       /* 16px */
    --spacing-lg: 1.5rem;     /* 24px */
    --spacing-xl: 2rem;       /* 32px */
    --spacing-2xl: 3rem;      /* 48px */
    --spacing-3xl: 4rem;      /* 64px */
    --spacing-4xl: 6rem;      /* 96px */
    --spacing-5xl: 8rem;      /* 128px */
    
    /* Transições */
    --transition-quick: 0.15s ease;
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    --transition-slower: 0.8s ease;
    
    --transition-ease-in: cubic-bezier(0.32, 0, 0.67, 0);
    --transition-ease-out: cubic-bezier(0.33, 1, 0.68, 1);
    --transition-ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);

    /* Bordas */
    --border-radius-xs: 0.125rem;
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.375rem;
    --border-radius-lg: 0.5rem;
    --border-radius-xl: 0.75rem;
    --border-radius-2xl: 1rem;
    --border-radius-3xl: 1.5rem;
    --border-radius-full: 9999px;

    /* Breakpoints */
    --breakpoint-xs: 320px;
    --breakpoint-sm: 576px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
    --breakpoint-2xl: 1536px;
    
    /* Z-index */
    --z-under: -1;
    --z-base: 1;
    --z-floating: 10;
    --z-sticky: 200;
    --z-header: 1000;
    --z-dropdown: 1100;
    --z-mobile-menu: 1200;
    --z-modal-backdrop: 1250;
    --z-modal: 1300;
    --z-toast: 1400;
    --z-tooltip: 1500;
    --z-dev-tools: 9999;

    /* Layout */
    --container-max-width: 1280px;
    --container-max-width-wide: 1440px;
    --container-max-width-narrow: 960px;
    --container-padding-xs: var(--spacing-md);
    --container-padding-sm: var(--spacing-lg);
    --container-padding-md: var(--spacing-xl);
    --container-gutter-xs: var(--spacing-sm);
    --container-gutter-sm: var(--spacing-md);
    --container-gutter-md: var(--spacing-lg);
    --container-gutter-lg: var(--spacing-xl);
    --container-gutter-xl: var(--spacing-2xl);

    /* Formas e gradientes */
    --shape-1-color: linear-gradient(135deg, #FF6B9D, #4ECDC4);
    --shape-2-color: linear-gradient(135deg, #4FACFE, #00F2FE);
    --shape-3-color: linear-gradient(135deg, #A8EDEA, #FED6E3);
    --shape-4-color: linear-gradient(135deg, #FFB75E, #ED8F03);
    --shape-5-color: linear-gradient(135deg, #4FACFE, #00F2FE);
    --shape-6-color: linear-gradient(135deg, #A8EDEA, #FED6E3);

    /* Aspect Ratios */
    --aspect-video: 16 / 9;
    --aspect-square: 1 / 1;
    --aspect-photo: 4 / 3;
    --aspect-portrait: 3 / 4;

    /* Focus e acessibilidade */
    --focus-ring-color: var(--primary-color);
    --focus-ring-width: 2px;
    --focus-ring-offset: 2px;
    --focus-ring-style: solid;
    
    /* Animação */
    --animation-duration-fast: 0.1s;
    --animation-duration-base: 0.3s;
    --animation-duration-slow: 0.5s;
}

/* ===========================
    RESET E BASE
   =========================== */

/* Redefinição de CSS moderno */
*, *::before, *::after {
    box-sizing: border-box;
}

* {
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    overflow-y: scroll; /* Força a barra de rolagem a estar sempre visível, evitando saltos de layout */
    /* Melhorias para performance */
    -webkit-tap-highlight-color: transparent;
    /* Renderização de fonte */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    /* Scrollbar personalizada */
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) var(--bg-secondary);
}

/* Scrollbar personalizada para Webkit */
html::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

html::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
}

html::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: var(--border-radius-sm);
    border: 2px solid var(--bg-secondary);
}

html::-webkit-scrollbar-thumb:hover {
    background: var(--primary-light);
}

/* Transições globais */
body,
button,
a,
input,
select,
textarea,
.navbar,
.hero-glass-card,
.service-glass-card,
.why-card,
.dropdown-menu,
.mobile-menu,
.language-dropdown {
    transition: background-color var(--transition-base), 
                color var(--transition-base), 
                border-color var(--transition-base),
                box-shadow var(--transition-base),
                transform var(--transition-base);
    will-change: auto;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    -webkit-text-size-adjust: 100%;
    -webkit-touch-callout: none;
    -webkit-overflow-scrolling: touch;
}

/* Trava o scroll quando o menu mobile está aberto */
body.menu-open {
    overflow: hidden;
}

/* Acessibilidade avançada para foco */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: var(--focus-ring-width) var(--focus-ring-style) var(--focus-ring-color);
    outline-offset: var(--focus-ring-offset);
    box-shadow: 0 0 0 calc(var(--focus-ring-width) + var(--focus-ring-offset)) 
                rgba(39, 159, 245, 0.25);
}

/* Fallback para navegadores antigos */
a:focus,
button:focus,
input:focus,
select:focus,
textarea:focus {
    outline: var(--focus-ring-width) var(--focus-ring-style) var(--focus-ring-color);
    outline-offset: var(--focus-ring-offset);
}

/* Links */
a {
    text-decoration: none;
    color: inherit;
    -webkit-tap-highlight-color: rgba(39, 159, 245, 0.3);
}

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

/* Botões */
button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
    font-size: inherit;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

button:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

/* Listas */
ul, ol {
    list-style: none;
    margin: 0;
    padding: 0;
}

/* Imagens e SVG */
img, svg {
    max-width: 100%;
    height: auto;
    display: block;
    -webkit-user-drag: none;
    -khtml-user-drag: none;
    -moz-user-drag: none;
    -o-user-drag: none;
}

/* SVG específicos */
svg {
    pointer-events: none;
}

/* Iframes */
iframe {
    border: none;
    width: 100%;
}

/* Seleção de texto personalizada */
::selection {
    background: rgba(39, 159, 245, 0.3);
    color: var(--text-primary);
}

/* Placeholder */
::placeholder {
    color: var(--text-tertiary);
    opacity: 1;
}

/* Screen reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.sr-only-focusable:active,
.sr-only-focusable:focus {
    position: static;
    width: auto;
    height: auto;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* Focus dentro de modais */
[data-modal-open] .focus-trap {
    position: relative;
}

/* Container principal */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-gutter-md);
    -webkit-overflow-scrolling: touch;
    scroll-margin-top: calc(var(--header-height, 70px) + var(--spacing-md));
}

/* Containers com variações */
.container--wide {
    max-width: var(--container-max-width-wide);
}

.container--narrow {
    max-width: var(--container-max-width-narrow);
}

.container--fluid {
    max-width: 100%;
    padding: 0 var(--container-gutter-md);
}

.container--full {
    max-width: 100%;
    padding: 0;
}

/* Breakpoints responsivos */
@media (min-width: 576px) {
    .container {
        padding: 0 var(--container-gutter-sm);
    }
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--container-gutter-md);
    }
    
    .container--fluid {
        padding: 0 var(--container-gutter-lg);
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--container-gutter-lg);
    }
    
    .container--fluid {
        padding: 0 var(--container-gutter-xl);
    }
}

@media (min-width: 1280px) {
    .container {
        padding: 0 var(--container-gutter-xl);
    }
}

/* Container com conteúdo centrado */
.container--center {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

/* Container com altura mínima */
.container--min-height {
    min-height: 100vh;
}

/* Container para seções */
.container--section {
    padding-top: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
}

@media (min-width: 768px) {
    .container--section {
        padding-top: var(--spacing-3xl);
        padding-bottom: var(--spacing-3xl);
    }
}

/* Grid system básico */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 calc(var(--container-gutter-md) * -1);
}

.col {
    flex: 1;
    padding: 0 var(--container-gutter-md);
}

/* Utilitários para uso com JavaScript */
.theme-transition * {
    transition: background-color var(--transition-base), 
                color var(--transition-base), 
                border-color var(--transition-base),
                box-shadow var(--transition-base),
                fill var(--transition-base),
                stroke var(--transition-base);
    will-change: auto;
}

/* Utilitário para conteúdo restrito */
.content-constrained {
    max-width: 800px;
    margin: 0 auto;
}

/* Utilitário para alinhamento */
.align-center {
    margin-left: auto;
    margin-right: auto;
}

.align-left {
    margin-right: auto;
}

.align-right {
    margin-left: auto;
}

/* Utilitário para espaçamento */
.container-spacing {
    padding: var(--spacing-xl) 0;
}

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

.container-spacing--loose {
    padding: var(--spacing-3xl) 0;
}

/* Utilitário para overflow */
.container--scrollable {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/* Utilitário para debugging */
.debug-container {
    outline: 1px dashed var(--primary-color);
    background: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 10px,
        rgba(39, 159, 245, 0.1) 10px,
        rgba(39, 159, 245, 0.1) 20px
    );
}

/* Container responsivo com quebra de linha */
.container-responsive {
    display: grid;
    gap: var(--spacing-md);
}

@media (min-width: 768px) {
    .container-responsive {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: var(--spacing-lg);
    }
}

/* Container para cards */
.container-cards {
    display: grid;
    gap: var(--spacing-md);
    grid-template-columns: 1fr;
}

@media (min-width: 576px) {
    .container-cards {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .container-cards {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1200px) {
    .container-cards {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Container para leitores de tela */
.container-sr {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Container com foco melhorado */
.container-focusable:focus-within {
    outline: var(--focus-ring-width) var(--focus-ring-style) var(--focus-ring-color);
    outline-offset: var(--focus-ring-offset);
}

/* Container com animação de entrada */
.container--animate {
    opacity: 0;
    transform: translateY(var(--spacing-md));
    transition: opacity var(--transition-slow) var(--transition-ease-out),
                transform var(--transition-slow) var(--transition-ease-out);
}

.container--animate.animate-in {
    opacity: 1;
    transform: translateY(0);
}

/* Container com efeito de paralaxe */
.container-parallax {
    perspective: 1px;
    height: 100vh;
    overflow-x: hidden;
    overflow-y: auto;
}

/* Container com contain painting */
.container-contained {
    contain: layout style paint;
}

/* Container com will-change */
.container-will-change {
    will-change: transform, opacity;
}

/* Container com hardware acceleration */
.container-accelerated {
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

/* --- Botão Voltar ao Topo --- */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;    
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    text-decoration: none;
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px) scale(0.9);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.back-to-top:hover {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-color: var(--primary-color);
    transform: scale(1.1);
    box-shadow: 0 8px 25px rgba(39, 159, 245, 0.3);
}

/* Esconde o botão de voltar ao topo quando o menu mobile está aberto */
body.menu-open .back-to-top {
    opacity: 0;
    visibility: hidden;
}