/**
 * MSA Teoria Musical Master - Estilos Principais
 * Desenvolvido por ninjacoder (ninjacoder.com.br)
 */
:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-card: rgba(30, 41, 59, 0.95);
    --border-color: rgba(255, 255, 255, 0.12);
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #38bdf8;
    
    --font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --border-radius: 12px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --transition: all 0.2s ease;
}

[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --bg-card: #ffffff;
    --border-color: #e2e8f0;
    
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-muted: #64748b;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ==================== CORREÇÃO CRÍTICA DE SELECT E OPTION NO DARK MODE ==================== */
select, option, optgroup {
    background-color: #1e293b !important;
    color: #f8fafc !important;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 14px;
    font-family: inherit;
    font-size: 14px;
    outline: none;
}

[data-theme="light"] select, [data-theme="light"] option {
    background-color: #ffffff !important;
    color: #0f172a !important;
    border-color: #cbd5e1;
}

select:focus {
    border-color: var(--primary-color) !important;
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.25);
}

option {
    padding: 10px;
    background: #1e293b !important;
    color: #f8fafc !important;
}

option:checked, option:hover {
    background: #4f46e5 !important;
    color: #ffffff !important;
}

input[type="text"], input[type="number"], input[type="range"] {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 14px;
    outline: none;
    font-family: inherit;
}

input[type="text"]:focus {
    border-color: var(--primary-color);
}

/* ==================== HEADER & MENU RESPONSIVO COM DROPDOWNS ==================== */
.app-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 10px 20px;
    position: sticky;
    top: 0;
    z-index: 200;
    backdrop-filter: blur(12px);
}

.header-container {
    max-width: 1240px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: inherit;
    flex-shrink: 0;
}

.brand-icon {
    font-size: 28px;
    background: linear-gradient(135deg, var(--primary-color), var(--info-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-text h1 {
    font-size: 17px;
    font-weight: 700;
    letter-spacing: -0.4px;
    white-space: nowrap;
}

.brand-author-badge {
    font-size: 11px;
    color: var(--info-color);
    font-weight: 600;
    display: block;
}

/* Menu Dropdown & Itens */
.header-nav {
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-link-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 8px 14px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

.nav-link-btn:hover, .nav-link-btn.active {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

/* Dropdowns elegantes */
.nav-dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: #1e293b;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    min-width: 200px;
    padding: 6px;
    z-index: 300;
    animation: fadeIn 0.18s ease;
}

[data-theme="light"] .dropdown-menu {
    background: #ffffff;
    border-color: #cbd5e1;
}

.nav-dropdown:hover .dropdown-menu,
.nav-dropdown:focus-within .dropdown-menu,
.dropdown-menu.show-menu {
    display: block;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 10px 14px;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 13.5px;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: var(--transition);
}

.dropdown-item:hover, .dropdown-item.active {
    background: var(--bg-tertiary);
    color: var(--info-color);
}

.dropdown-arrow {
    font-size: 10px;
    transition: transform 0.2s ease;
    opacity: 0.7;
}

.nav-dropdown:hover .dropdown-arrow {
    transform: rotate(180deg);
}

/* Ações Direitas (Tema e Mobile Toggle) */
.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.theme-toggle-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 15px;
    transition: var(--transition);
}

.theme-toggle-btn:hover {
    background: rgba(255, 255, 255, 0.15);
}

.mobile-menu-toggle {
    display: none;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 18px;
    cursor: pointer;
}

/* Container Principal */
.app-main {
    max-width: 1240px;
    margin: 0 auto;
    padding: 24px 20px;
    flex: 1;
    width: 100%;
}

.app-view {
    display: none;
}

.app-view.active-view {
    display: block;
    animation: fadeIn 0.25s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Footer */
.app-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 24px;
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
    margin-top: auto;
}

.footer-brand {
    font-weight: 700;
    color: var(--info-color);
    text-decoration: none;
}

.footer-brand:hover {
    text-decoration: underline;
}

/* Responsividade Mobile e Telas Médias */
@media (max-width: 992px) {
    .mobile-menu-toggle {
        display: block;
    }
    
    .header-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #0f172a;
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        align-items: stretch;
        padding: 12px 16px;
        gap: 8px;
        box-shadow: var(--shadow-md);
    }
    
    [data-theme="light"] .header-nav {
        background: #ffffff;
    }

    .header-nav.mobile-nav-open {
        display: flex;
    }

    .nav-dropdown {
        width: 100%;
    }

    .dropdown-menu {
        position: static;
        display: block;
        box-shadow: none;
        border: none;
        background: transparent;
        padding-left: 12px;
        margin-top: 4px;
    }

    .nav-link-btn {
        width: 100%;
        justify-content: space-between;
    }
}