:root {
    /* Paleta de Cores - Tema Claro */
    --color-background: #F0F2F5;
    --color-background-pattern: #E2E8F0;
    --color-surface: #FFFFFF;
    --color-text-primary: #1A202C;
    --color-text-secondary: #6C757D;
    --color-brand-primary: #4A90E2;
    --color-brand-dark: #357ABD; /* Variação para hover/ativo */
    --color-brand-secondary: #00BFA5;
    --color-brand-secondary-dark: #008f7b; /* Variação para hover */
    --color-border: #D1D1D1;
    --color-input-bg: #FAFAFA;
    --color-theme-toggle: #6C757D;
    --color-error: #E53E3E; /* Cor para mensagens de erro */
    --color-danger-button: #E53E3E; /* Cor para botão de perigo */
    --color-danger-button-dark: #C53030; /* Variação para hover do botão de perigo */


    /* Tipografia */
    --font-family-system: -apple-system, 'Segoe UI', Roboto, sans-serif;
    --font-size-hero: 3.5rem;
    --font-size-title: 2.8rem;
    --font-weight-title: 800; /* Mais pesado para destaque */
    --font-size-body: 1.1rem;
    --font-weight-body: 400;
    --font-size-input-button: 1rem;
    --font-weight-input-button: 600;
    --line-height-body: 1.5;

    /* Espaçamento */
    --spacing-unit: 1.5rem;
    --spacing-s: 0.75rem;
    --spacing-m: 1.5rem;
    --spacing-l: 2.25rem;
    --spacing-xl: 3rem;

    /* Bordas e Sombras */
    --border-radius-card: 16px; /* Um pouco mais moderno */
    --border-radius-input-button: 8px;
    --shadow-card: 0 10px 25px rgba(0, 0, 0, 0.05); /* Sombra mais suave e difusa */
    --shadow-button-hover: 0 8px 20px rgba(74, 144, 226, 0.25);
    --shadow-input-focus: 0 0 0 3px rgba(74, 144, 226, 0.15);

    /* Transições */
    --transition-duration: 200ms;
    --transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
}

/* Modo Escuro */
body.dark-theme {
    --color-background: #1A1A2E;
    --color-background-pattern: #202035;
    --color-surface: #262640;
    --color-text-primary: #E0E0E0;
    --color-text-secondary: #A0A0B0;
    --color-brand-primary: #6FA6F2;
    --color-brand-dark: #4A90E2;
    --color-brand-secondary: #4BEED1;
    --color-brand-secondary-dark: #00BFA5;
    --color-border: #3A3A50;
    --color-input-bg: #1F1F38;
    --color-theme-toggle: #E0E0E0;
    --color-error: #FC8181;
    --color-danger-button: #E53E3E;
    --color-danger-button-dark: #C53030;


    --shadow-card: 0 10px 25px rgba(0, 0, 0, 0.3);
    --shadow-button-hover: 0 8px 20px rgba(111, 166, 242, 0.25);
    --shadow-input-focus: 0 0 0 3px rgba(111, 166, 242, 0.15);
}


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

body {
    font-family: var(--font-family-system);
    background-color: var(--color-background);
    color: var(--color-text-primary);
    line-height: var(--line-height-body);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: var(--spacing-m);
    /* Padrão de fundo sutil para textura */
    background-image: radial-gradient(var(--color-background-pattern) 1px, transparent 1px);
    background-size: 24px 24px;
    transition: background-color var(--transition-duration), color var(--transition-duration);
}

.container {
    max-width: 600px;
    width: 100%;
    perspective: 1000px;
}

/* Botão de alternar tema */
.theme-toggle {
    position: absolute;
    top: var(--spacing-m);
    right: var(--spacing-m);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: background-color var(--transition-duration), border-color var(--transition-duration), transform 0.1s, box-shadow var(--transition-duration);
    color: var(--color-theme-toggle);
    box-shadow: var(--shadow-card);
}

.theme-toggle:hover {
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}
.theme-toggle:active {
    transform: translateY(0);
}

.theme-toggle .icon {
    width: 20px;
    height: 20px;
    stroke-width: 2;
    transition: opacity var(--transition-duration), transform var(--transition-duration);
}

.theme-toggle .sun-icon {
    opacity: 1;
    transform: scale(1);
}

.body.dark-theme .theme-toggle .sun-icon {
    opacity: 0;
    transform: scale(0.8);
}

.theme-toggle .moon-icon {
    position: absolute;
    opacity: 0;
    transform: scale(0.8);
}

.body.dark-theme .theme-toggle .moon-icon {
    opacity: 1;
    transform: scale(1);
}


/* Navegação entre Páginas */
.page-section {
    display: none;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity var(--transition-duration) ease, transform var(--transition-duration) ease;
}

.page-section.active {
    display: flex;
    flex-direction: column;
    opacity: 1;
    transform: translateY(0);
    animation: slideUp 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Card Genérico */
.welcome-card, .profile-card {
    background-color: var(--color-surface);
    border-radius: var(--border-radius-card);
    box-shadow: var(--shadow-card);
    padding: var(--spacing-l);
    text-align: center;
    border: 1px solid var(--color-border);
    transition: background-color var(--transition-duration), border-color var(--transition-duration), box-shadow var(--transition-duration);
}

/* --- Estilos da Página de Boas-Vindas --- */
.welcome-card {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-m);
}

.welcome-card__title {
    font-size: var(--font-size-title);
    font-weight: var(--font-weight-title);
    color: var(--color-text-primary);
    line-height: 1.1;
    letter-spacing: -0.03em;
    transition: color var(--transition-duration);
    text-align: center; /* Centraliza o título */
}

.welcome-card__message {
    font-size: var(--font-size-body);
    color: var(--color-text-secondary);
    max-width: 90%;
    margin: 0 auto;
    transition: color var(--transition-duration);
}

.input-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-s);
    margin-top: var(--spacing-s);
}

.input-section__label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-primary);
    text-align: left;
    margin-left: 4px;
    transition: color var(--transition-duration);
}

.input-section__input {
    width: 100%;
    padding: 14px var(--spacing-m);
    font-size: var(--font-size-input-button);
    color: var(--color-text-primary);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-input-button);
    background-color: var(--color-input-bg);
    transition: all var(--transition-duration) ease;
}

.input-section__input:focus {
    outline: none;
    border-color: var(--color-brand-primary);
    background-color: var(--color-surface);
    box-shadow: var(--shadow-input-focus);
}

.input-section__button {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    padding: 14px var(--spacing-m);
    font-size: var(--font-size-input-button);
    font-weight: var(--font-weight-input-button);
    color: var(--color-surface);
    background: linear-gradient(135deg, var(--color-brand-primary) 0%, #6FA6F2 100%);
    border: none;
    border-radius: var(--border-radius-input-button);
    cursor: pointer;
    transition: transform 0.1s, box-shadow var(--transition-duration);
}

.input-section__button:hover {
    box-shadow: var(--shadow-button-hover);
    transform: translateY(-2px);
}

.input-section__button:active {
    transform: translateY(0);
}

.input-section__button--secondary {
    background: transparent;
    color: var(--color-brand-primary);
    border: 2px solid var(--color-brand-primary);
    margin-top: var(--spacing-s);
}

.input-section__button--secondary:hover {
    background: rgba(74, 144, 226, 0.05);
    box-shadow: none;
}

.input-section__button--danger {
    background: var(--color-danger-button);
    color: var(--color-surface);
    border: none;
    margin-top: var(--spacing-s);
}

.input-section__button--danger:hover {
    background: var(--color-danger-button-dark);
    box-shadow: none;
}

.error-message {
    color: var(--color-error);
    font-size: 0.9rem;
    margin-top: var(--spacing-s);
    text-align: center;
}

/* --- Estilos da Página de Perfil --- */
.profile-card {
    padding: var(--spacing-xl) var(--spacing-l);
    align-items: center;
    gap: var(--spacing-s); /* Ajustado para incluir o email */
    overflow: hidden;
    position: relative;
}

/* Detalhe decorativo sutil */
.profile-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, var(--color-surface) 0%, transparent 60%);
    opacity: 0.8;
    z-index: 0;
    pointer-events: none;
    transition: background var(--transition-duration), opacity var(--transition-duration);
}

.profile-card__name {
    font-size: var(--font-size-hero);
    font-weight: var(--font-weight-title);
    /* Texto gradiente para destaque máximo */
    background: linear-gradient(135deg, var(--color-brand-primary) 30%, var(--color-brand-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
    letter-spacing: -0.04em;
    margin-bottom: 0.2rem;
    position: relative;
    z-index: 1;
    transition: background var(--transition-duration);
}

.profile-card__email {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-s); /* Espaçamento entre email e título */
    position: relative;
    z-index: 1;
    transition: color var(--transition-duration);
}

.profile-card__title {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-l);
    position: relative;
    z-index: 1;
    transition: color var(--transition-duration);
}

.profile-card__links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-s);
    width: 100%;
    max-width: 320px;
    margin-bottom: var(--spacing-l);
    z-index: 1;
}

.profile-card__link {
    display: flex;
    align-items: center;
    justify-content: center; /* Centralizado */
    gap: 12px;
    padding: 14px 20px;
    background-color: var(--color-surface);
    color: var(--color-text-primary);
    text-decoration: none;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-input-button);
    font-size: 1rem;
    font-weight: 600;
    transition: all var(--transition-duration) cubic-bezier(0.4, 0, 0.2, 1);
}

/* Cor específica para hover dos links para manter identidade mas dar feedback */
.profile-card__link:hover {
    border-color: var(--color-brand-secondary);
    color: var(--color-brand-secondary-dark);
    background-color: rgba(0, 191, 165, 0.03);
    transform: translateX(4px); /* Micro-interação de movimento */
}

.profile-card__link:active {
    transform: translateX(2px);
}

.profile-card__link .icon {
    width: 22px;
    height: 22px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    transition: stroke var(--transition-duration);
}

.profile-card__button {
    background: transparent;
    color: var(--color-text-secondary);
    border: none;
    font-weight: 500;
    cursor: pointer;
    padding: var(--spacing-s);
    transition: color var(--transition-duration);
    z-index: 1;
}

.profile-card__button:hover {
    color: var(--color-brand-primary);
    text-decoration: underline;
}

@keyframes fade-in {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in-animation {
    animation: fade-in 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* Responsividade */
@media (max-width: 480px) {
    :root {
        --font-size-hero: 2.6rem;
        --font-size-title: 2rem;
    }
    
    .profile-card {
        padding: var(--spacing-l) var(--spacing-m);
    }

    .profile-card__links {
        gap: 10px;
    }

    .theme-toggle {
        top: var(--spacing-s);
        right: var(--spacing-s);
        width: 40px;
        height: 40px;
    }
}