/* ==========================================================================
   1. VARIÁVEIS (CUSTOM PROPERTIES)
   ========================================================================== */

:root {
    /* Paleta de Cores - Modo Claro */
    --c-primary: #4A90E2;      /* Azul sono/tranquilidade */
    --c-secondary: #7B68EE;    /* Roxo noturno */
    --c-success: #50C878;      /* Verde bem-estar */
    --c-warning: #FFB74D;      /* Laranja suave */
    --c-background: #F8F9FA;  /* Branco suave */
    --c-surface: #FFFFFF;      /* Superfície de cards */
    --c-text-primary: #2C3E50; /* Azul escuro (texto principal) */
    --c-text-secondary: #5a6a7a; /* Cinza azulado (texto secundário) */
    --c-border: #E1E5E9;       /* Cinza claro para bordas */

    /* Tipografia */
    /* A fonte 'Inter' agora é fornecida pelo Google Fonts chamado no meta.php */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-size-base: 16px; /* 1rem */
    --line-height-base: 1.6;

    /* Espaçamentos */
    --spacing-xs: 0.25rem;  /* 4px  */
    --spacing-sm: 0.5rem;   /* 8px  */
    --spacing-md: 1rem;     /* 16px */
    --spacing-lg: 1.5rem;   /* 24px */
    --spacing-xl: 2rem;     /* 32px */
    --spacing-xxl: 3rem;    /* 48px */
    
    /* Bordas e Sombras */
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --shadow-sm: 0 2px 4px rgba(44, 62, 80, 0.05);
    --shadow-md: 0 4px 8px rgba(44, 62, 80, 0.08);
    --shadow-lg: 0 10px 20px rgba(44, 62, 80, 0.1);

    /* Transições */
    --transition-fast: 0.15s ease-in-out;
    --transition-base: 0.3s ease-in-out;
}

/* Paleta de Cores - Modo Escuro */
[data-theme="dark"] {
    --c-primary: #6BB6FF;      /* Azul mais claro para contraste */
    --c-secondary: #9F8FFF;    /* Roxo mais claro */
    --c-success: #72DDA3;      /* Verde mais claro */
    --c-background: #121828;  /* Azul muito escuro (fundo) */
    --c-surface: #1A2238;      /* Azul escuro (superfície de cards) */
    --c-text-primary: #E4E6EA; /* Branco suave (texto principal) */
    --c-text-secondary: #a0a7b4; /* Cinza claro (texto secundário) */
    --c-border: #3A3A5C;       /* Roxo escuro para bordas */
}


/* ==========================================================================
   2. RESET E ESTILOS GLOBAIS
   ========================================================================== */

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--c-background);
    color: var(--c-text-primary);
    line-height: var(--line-height-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-base), color var(--transition-base);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--c-text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

p {
    margin-bottom: var(--spacing-md);
    max-width: 75ch;
}

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

a:hover {
    color: var(--c-secondary);
    text-decoration: underline;
}

ul, ol {
    list-style: none;
}

.article-container ul, .article-container ol {
    list-style-position: outside;
    padding-left: var(--spacing-lg);
}

.article-container ul li { list-style: disc; }
.article-container ol li { list-style: decimal; }

.article-container ul li::marker, 
.article-container ol li::marker {
    color: var(--c-primary);
    font-weight: 600;
}


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

/* Foco visível para acessibilidade */
:focus-visible {
    outline: 3px solid var(--c-primary);
    outline-offset: 3px;
    border-radius: var(--border-radius);
}

/* Melhora a acessibilidade de links no corpo do texto */
.article-container p a,
.disclaimer a,
.cookie-link {
    text-decoration: underline;
    text-decoration-color: var(--c-primary);
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}

.article-container p a:hover,
.disclaimer a:hover,
.cookie-link:hover {
    text-decoration-color: var(--c-secondary);
}


/* ==========================================================================
   3. LAYOUT E COMPONENTES
   ========================================================================== */

.container {
    width: 100%;
    max-width: 1140px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--spacing-lg);
    padding-right: var(--spacing-lg);
}

/* --- Header --- */
.site-header {
    padding: var(--spacing-md) 0;
    background-color: transparent;
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

body.scrolled .site-header {
    background-color: var(--c-surface);
    box-shadow: var(--shadow-md);
}

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

.logo a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--c-text-primary);
}
.logo a:hover { text-decoration: none; }
.logo-icon { color: var(--c-primary); }

.nav-list {
    display: flex;
    gap: var(--spacing-lg);
}
.nav-link {
    font-weight: 600;
    color: var(--c-text-secondary);
    padding: var(--spacing-sm) 0;
    position: relative;
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--c-primary);
    transition: width var(--transition-base);
}
.nav-link:hover,
.nav-link.active {
    color: var(--c-text-primary);
}
.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.mobile-menu-toggle { display: none; } /* Oculto em desktop */

/* --- Dark Mode Toggle --- */
.dark-mode-toggle {
    background: var(--c-border);
    border: none;
    width: 50px;
    height: 26px;
    border-radius: 13px;
    cursor: pointer;
    position: relative;
    display: flex;
    align-items: center;
    transition: background-color var(--transition-base);
}
.dark-mode-toggle::after {
    content: '';
    position: absolute;
    left: 3px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: transform var(--transition-base);
}
[data-theme="dark"] .dark-mode-toggle::after {
    transform: translateX(24px);
}
.dark-mode-toggle .icon-sun, .dark-mode-toggle .icon-moon {
    position: absolute;
    width: 16px;
    height: 16px;
    background-size: contain;
    background-repeat: no-repeat;
    transition: opacity var(--transition-base);
}
.icon-sun { 
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23F9A825'%3E%3Cpath d='M12 7c-2.76 0-5 2.24-5 5s2.24 5 5 5 5-2.24 5-5-2.24-5-5-5zM2 13h2c.55 0 1-.45 1-1s-.45-1-1-1H2c-.55 0-1 .45-1 1s.45 1 1 1zm18 0h2c.55 0 1-.45 1-1s-.45-1-1-1h-2c-.55 0-1 .45-1 1s.45 1 1 1zM11 2v2c0 .55.45 1 1 1s1-.45 1-1V2c0-.55-.45-1-1-1s-1 .45-1 1zm0 18v2c0 .55.45 1 1 1s1-.45 1-1v-2c0-.55-.45-1-1-1s-1 .45-1 1zM5.64 5.64c-.39-.39-1.02-.39-1.41 0-.39.39-.39 1.02 0 1.41l1.41 1.41c.39.39 1.02.39 1.41 0 .39-.39.39-1.02 0-1.41L5.64 5.64zm12.72 12.72c-.39-.39-1.02-.39-1.41 0-.39.39-.39 1.02 0 1.41l1.41 1.41c.39.39 1.02.39 1.41 0 .39-.39.39-1.02 0-1.41l-1.41-1.41zM18.36 5.64l-1.41 1.41c-.39.39-.39 1.02 0 1.41.39.39 1.02.39 1.41 0l1.41-1.41c.39-.39.39-1.02 0-1.41-.39-.39-1.02-.39-1.41 0zm-12.72 12.72l-1.41 1.41c-.39.39-.39 1.02 0 1.41.39.39 1.02.39 1.41 0l1.41-1.41c.39-.39.39-1.02 0-1.41-.39-.39-1.02-.39-1.41 0z'/%3E%3C/svg%3E");
    left: 4px;
    opacity: 0;
}
.icon-moon { 
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23FFFFFF'%3E%3Cpath d='M12 2c-5.52 0-10 4.48-10 10s4.48 10 10 10c2.25 0 4.33-.74 6-2.02-.34-.02-.68-.03-1.02-.03-4.42 0-8-3.58-8-8s3.58-8 8-8c.34 0 .68 0 1.02.03C16.33 2.74 14.25 2 12 2z'/%3E%3C/svg%3E");
    right: 4px;
    opacity: 1;
}
[data-theme="dark"] .icon-sun { opacity: 1; }
[data-theme="dark"] .icon-moon { opacity: 0; }

/* --- Hero Section --- */
.hero-section {
    padding: var(--spacing-xxl) 0;
    text-align: center;
}
.hero-section h1 { margin-bottom: var(--spacing-md); }
.hero-section .lead {
    font-size: 1.25rem;
    color: var(--c-text-secondary);
    max-width: 60ch;
    margin: 0 auto;
}

/* --- Calculator Section --- */
.calculator-section {
    padding: var(--spacing-xxl) 0;
}
.calculator-wrapper {
    background: var(--c-surface);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    max-width: 600px;
    margin: 0 auto;
    transition: background-color var(--transition-base), box-shadow var(--transition-base);
}
.sleep-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}
.form-group {
    display: flex;
    flex-direction: column;
}
.form-group label {
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}
.form-input {
    font-family: var(--font-family);
    font-size: 1.5rem;
    padding: var(--spacing-md);
    border: 2px solid var(--c-border);
    border-radius: var(--border-radius);
    background: var(--c-background);
    color: var(--c-text-primary);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form-input:focus {
    border-color: var(--c-primary);
    box-shadow: 0 0 0 3px var(--c-primary-alpha, rgba(74, 144, 226, 0.2));
}
[data-theme="dark"] .form-input:focus {
    box-shadow: 0 0 0 3px var(--c-primary-alpha, rgba(107, 182, 255, 0.2));
}

/* --- Botões --- */
.btn-primary {
    background: linear-gradient(135deg, var(--c-primary), var(--c-secondary));
    color: white;
    border: none;
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: 1.125rem;
    font-weight: 600;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: var(--shadow-md);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    text-decoration: none;
}

/* --- Results --- */
.results-placeholder {
    text-align: center;
    color: var(--c-text-secondary);
    padding: var(--spacing-xl) 0;
}
.results-header { margin-bottom: var(--spacing-lg); text-align: center; }
.sleep-times-grid {
    display: grid;
    gap: var(--spacing-md);
}
.sleep-time-card {
    background-color: var(--c-background);
    border: 1px solid var(--c-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    text-align: center;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.sleep-time-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}
.sleep-time-card .bed-time .time { font-size: 1.75rem; font-weight: 600; display: block; }
.sleep-time-card .bed-time .label { font-size: 0.875rem; color: var(--c-text-secondary); }
.sleep-info { margin: var(--spacing-md) 0; }
.sleep-info .cycles { font-weight: 600; }
.sleep-info .duration { color: var(--c-text-secondary); }
.sleep-time-card[data-quality="ideal"] { border-left: 5px solid var(--c-primary); }
.sleep-time-card[data-quality="adequate"] { border-left: 5px solid var(--c-success); }
.sleep-time-card[data-quality="minimum"] { border-left: 5px solid var(--c-warning); }


/* --- Seções de Conteúdo --- */
.how-it-works-section, .sleep-tips-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--c-surface);
    text-align: center;
}
.how-it-works-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    text-align: left;
    margin-top: var(--spacing-xl);
}
.how-it-works-card {
    background-color: var(--c-background);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}
.how-it-works-card .card-icon {
    width: 48px; height: 48px;
    background-color: var(--c-primary);
    color: white;
    font-size: 1.5rem;
    font-weight: 600;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}
.tips-list {
    display: inline-flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}
.tips-list li { display: flex; align-items: center; gap: var(--spacing-md); }
.tip-icon { font-size: 1.5rem; }


/* --- Footer --- */
.site-footer {
    background-color: var(--c-surface);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
    color: var(--c-text-secondary);
    font-size: 0.9rem;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xxl);
}
.footer-heading {
    font-size: 1rem;
    font-weight: 600;
    color: var(--c-text-primary);
    margin-bottom: var(--spacing-md);
}
.footer-links li { margin-bottom: var(--spacing-sm); }
.footer-links a { color: var(--c-text-secondary); }
.footer-links a:hover { color: var(--c-primary); }
.disclaimer {
    font-size: 0.8rem;
    opacity: 0.8;
    margin-top: var(--spacing-lg);
}
.footer-bottom {
    border-top: 1px solid var(--c-border);
    padding-top: var(--spacing-lg);
    text-align: center;
}
.footer-bottom p { margin-bottom: var(--spacing-xs); }

/* --- Páginas de Artigo e Institucionais --- */
.article-container, .page-institutional .container {
    max-width: 800px;
}
.article-header {
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--c-border);
    margin-bottom: var(--spacing-xl);
}
.article-header h1 {
    margin-bottom: var(--spacing-md);
}

/* --- Correções de Layout para Páginas de Artigo --- */
.article-container .content-section {
    clear: both; /* Garante que as seções não se sobreponham */
    padding-bottom: var(--spacing-lg);
}

.cta-section {
    margin: var(--spacing-xl) 0;
}

.cta-box {
    background-color: var(--c-surface);
    border: 1px solid var(--c-border);
    border-left: 5px solid var(--c-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    text-align: center;
}

.cta-box h3 {
    margin-bottom: var(--spacing-sm);
}

.cta-box p {
    margin-bottom: var(--spacing-lg);
    max-width: 100%;
}


/* ==========================================================================
   4. RESPONSIVIDADE (MOBILE-FIRST)
   ========================================================================== */

/* --- Tablet (768px e acima) --- */
@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }

    /* Menu mobile */
    .nav-list {
        position: fixed;
        top: 0;
        right: 0;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background-color: var(--c-surface);
        flex-direction: column;
        padding: var(--spacing-xxl) var(--spacing-lg);
        transform: translateX(100%);
        transition: transform var(--transition-base);
        box-shadow: -5px 0 15px rgba(0,0,0,0.1);
    }
    .nav-list.active {
        transform: translateX(0);
    }

    .mobile-menu-toggle {
        display: block;
        background: none;
        border: none;
        width: 30px;
        height: 30px;
        cursor: pointer;
        z-index: 101; /* Fica acima do menu */
    }
    .hamburger-icon,
    .hamburger-icon::before,
    .hamburger-icon::after {
        content: '';
        display: block;
        width: 100%;
        height: 3px;
        background-color: var(--c-text-primary);
        border-radius: 3px;
        transition: transform var(--transition-base), opacity var(--transition-base);
    }
    .hamburger-icon::before { transform: translateY(-8px); }
    .hamburger-icon::after { transform: translateY(8px); }

    .nav-list.active ~ .mobile-menu-toggle .hamburger-icon { background-color: transparent; }
    .nav-list.active ~ .mobile-menu-toggle .hamburger-icon::before { transform: rotate(45deg); }
    .nav-list.active ~ .mobile-menu-toggle .hamburger-icon::after { transform: rotate(-45deg); }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .about-column {
        grid-column: 1 / -1; /* Ocupa a linha inteira */
    }
}


/* --- Mobile (abaixo de 480px) --- */
@media (max-width: 480px) {
    .container {
        padding-left: var(--spacing-md);
        padding-right: var(--spacing-md);
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
}