/* ==========================================================================
   DECLARAÇÃO DE VARIÁVEIS E ESCOPO DE TEMAS
   ========================================================================== */
:root {
    /* Padrão Inicial (Fallback Dark) */
    --bg-main: #020617;
    --bg-card: #0b1329;
    --accent: #3b82f6;
    --accent-hover: #1d4ed8;
    --text-main: #f8fafc;
    --text-muted: #64748b;
    --border: #1e293b;
    --radius: 12px;
    --scrollbar-track: #020617;
    --scrollbar-thumb: #1e293b;
    --scrollbar-thumb-hover: #334155;
}

body.dark-theme {
    --bg-main: #020617;
    --bg-card: #0b1329;
    --accent: #3b82f6;
    --accent-hover: #1d4ed8;
    --text-main: #f8fafc;
    --text-muted: #64748b;
    --border: #1e293b;
    --scrollbar-track: #020617;
    --scrollbar-thumb: #1e293b;
    --scrollbar-thumb-hover: #334155;
}

body.light-theme {
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --accent: #3b82f6;
    --accent-hover: #1d4ed8;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --scrollbar-track: #f8fafc;
    --scrollbar-thumb: #cbd5e1;
    --scrollbar-thumb-hover: #94a3b8;
}

/* ==========================================================================
   RESET, TRANSIÇÃO GLOBAL E BLOQUEIO DE SELEÇÃO DE TEXTO
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: system-ui, -apple-system, sans-serif;
    -webkit-font-smoothing: antialiased;
    
    /* Transição fluida aplicada globalmente a todos os objetos da página */
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Remove por padrão a capacidade de selecionar ou arrastar textos */
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

/* Exceção crítica: Permite digitação e seleção normal dentro de campos de formulário */
input, textarea {
    user-select: text !important;
    -webkit-user-select: text !important;
    -moz-user-select: text !important;
    -ms-user-select: text !important;
}

html {
    scrollbar-width: thin;
    scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

/* Customização Estética do Scrollbar Global (Não afetada pela transição global) */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 9999px;
    border: 2px solid var(--scrollbar-track);
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    min-height: 100vh;
    padding-bottom: 160px;
    overflow-x: hidden;
}

/* Cabeçalho Superior Fixo */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 2rem;
    background: rgba(2, 6, 23, 0.1);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 900;
}

body.light-theme header {
    background: rgba(248, 250, 252, 0.1);
}

.logo {
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    text-transform: uppercase;
}

.logo span {
    color: var(--accent);
    text-shadow: 0 0 15px rgba(59, 130, 246, 0.3);
}

/* Caixas de Seleção de Idioma */
.lang-selector {
    display: flex;
    background: rgba(100, 116, 139, 0.08);
    padding: 0.25rem;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.lang-selector button {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.4rem 0.9rem;
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 700;
    border-radius: 6px;
}

.lang-selector button:hover {
    color: var(--text-main);
}

.lang-selector button.active {
    background: var(--accent);
    color: var(--text-main);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.2);
}

.container {
    max-width: 900px;
    margin: 2.5rem auto 4rem auto;
    padding: 0 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* ==========================================================================
   SEÇÃO DE DUPLO INPUT DE ENTRADA (MÓDULO DE SELEÇÃO)
   ========================================================================== */
.input-grid-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    width: 100%;
}

.drop-zone, .url-zone {
    background: var(--bg-card);
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 3rem 1.5rem;
    text-align: center;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.url-zone {
    cursor: default;
}

.drop-zone:hover, .url-zone:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 25px rgba(59, 130, 246, 0.08);
}

.drop-zone svg, .url-zone svg {
    color: var(--accent);
}

.drop-zone:hover svg {
    transform: translateY(-2px);
}

.drop-zone p, .url-zone p {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-muted);
}

/* Barramento Interno de Entrada de URL */
.url-input-container {
    display: flex;
    width: 100%;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.url-input-container input {
    flex-grow: 1;
    background: rgba(100, 116, 139, 0.06);
    border: 1px solid var(--border);
    padding: 0.6rem 0.8rem;
    border-radius: 8px;
    color: var(--text-main);
    font-size: 0.85rem;
    outline: none;
}

.url-input-container input:focus {
    border-color: var(--accent);
    background: rgba(100, 116, 139, 0.02);
}

.url-input-container button {
    background: var(--accent);
    color: #ffffff;
    border: none;
    padding: 0 1rem;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.url-input-container button:hover {
    background: var(--accent-hover);
    color: #f8fafc;
}

.url-input-container button:active {
    transform: scale(0.97);
}

.url-input-container button svg {
    color: inherit;
    stroke: currentColor;
}

/* ==========================================================================
   VISUALIZAÇÃO DE PAINÉIS DE METADADOS E CARDS
   ========================================================================== */
.meta-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.meta-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 2rem;
    border: 1px solid var(--border);
    display: flex;
    gap: 2.5rem;
    align-items: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.cover-wrapper {
    width: 180px;
    height: 180px;
    flex-shrink: 0;
    border-radius: 10px;
    overflow: hidden;
    background: rgba(100, 116, 139, 0.05);
    border: 1px solid var(--border);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
}

.cover-wrapper img:not(.field-hidden) {
    width: 100%;
    height: 100%;
    object-fit: cover;
    cursor: pointer;
}

.cover-wrapper img:not(.field-hidden):hover {
    transform: scale(1.02);
}

.no-cover {
    color: var(--text-muted);
}

/* Caixa de Informações Principais da Música */
.meta-info {
    flex-grow: 1;
    min-width: 0;
    
    /* Configuração de overflow para proteção contra textos e rótulos longos */
    max-height: 220px;
    overflow-y: auto;
    overflow-x: hidden;
    padding-right: 0.5rem;
}

/* Mini scrollbar interna para a área de informações da faixa */
.meta-info::-webkit-scrollbar { width: 4px; }
.meta-info::-webkit-scrollbar-track { background: transparent; }
.meta-info::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 2px; }

.meta-info h2 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-main);
    letter-spacing: -0.02em;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem 2rem;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.5rem;
}

.info-item .label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 0.05em;
}

.info-item .val {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-main);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Blocos Estendidos (Letras e Dados Técnicos) */
.extended-meta-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 2rem;
    border: 1px solid var(--border);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.extended-meta-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
    color: var(--text-main);
    border-left: 3px solid var(--accent);
    padding-left: 0.75rem;
}

.extended-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.extended-item {
    background: rgba(100, 116, 139, 0.03);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.extended-key {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 700;
    text-transform: uppercase;
}

.extended-val {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-main);
}

/* Compartimento Dedicado à Exibição de Letras */
.lyrics-content {
    background: rgba(100, 116, 139, 0.03);
    padding: 1.5rem;
    border-radius: 8px;
    font-size: 1rem;
    line-height: 1.7;
    white-space: pre-wrap;
    text-align: center;
    color: var(--text-main);
    border: 1px solid var(--border);
    
    /* Configuração de overflow para proteção da rolagem da letra da música */
    max-height: 300px;
    overflow-y: auto;
    overflow-x: hidden;
}

/* Mini scrollbar interna para a caixa de exibição de letras */
.lyrics-content::-webkit-scrollbar { width: 5px; }
.lyrics-content::-webkit-scrollbar-track { background: transparent; }
.lyrics-content::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 3px; }
.lyrics-content::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-thumb-hover); }

.field-hidden {
    display: none !important;
}

/* ==========================================================================
   DISPOSITIVOS MÓVEIS (RESPONSIVIDADE)
   ========================================================================== */
@media (max-width: 768px) {
    header {
        padding: 1rem 1.5rem;
    }
    .input-grid-wrapper {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    .container {
        margin: 1.5rem auto;
    }
    .drop-zone, .url-zone {
        padding: 2.5rem 1.25rem;
    }
    .meta-card {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
    .cover-wrapper {
        width: 150px;
        height: 150px;
    }
    .info-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    .extended-list {
        grid-template-columns: 1fr;
    }
    .meta-info {
        max-height: none; /* Desativa limite de altura em telas pequenas para empilhamento natural */
        overflow-y: visible;
    }
}