/* CSS gerado com auxílio de Claude 3.5 Sonnet */
      *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

        :root {
            --white: #ffffff;
            --gray-light: #aaa;
            --gray-mid: #444;
            --gray-dark: #222;
            --bg-dark: #111;
            --bg-gradient-end: #333;
        }

        body {
            background: linear-gradient(to bottom, var(--bg-dark), var(--bg-gradient-end));
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            font-family: 'DM Sans', sans-serif;
            color: var(--white);
            overflow: hidden;
            position: relative;
        }

        /* Teclas decorativas no fundo */
        .bg-keys {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            height: 220px;
            display: flex;
            align-items: flex-end;
            justify-content: center;
            gap: 3px;
            padding: 0 20px;
            opacity: 0.07;
            pointer-events: none;
        }

        .bg-key {
            background: white;
            border-radius: 4px 4px 6px 6px;
            flex: 1;
            max-width: 48px;
            animation: keyFloat 4s ease-in-out infinite;
        }

        .bg-key:nth-child(odd)  { height: 180px; animation-delay: 0.2s; }
        .bg-key:nth-child(even) { height: 160px; animation-delay: 0.6s; }
        .bg-key:nth-child(3n)   { height: 200px; animation-delay: 1s; }

        @keyframes keyFloat {
            0%, 100% { transform: translateY(0); }
            50%       { transform: translateY(-8px); }
        }

        /* Linha decorativa superior */
        .top-line {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--white);
        }

        /* Conteúdo central */
        .stage {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 48px;
            z-index: 10;
            animation: fadeUp 0.8s cubic-bezier(0.22, 1, 0.36, 1) both;
        }

        @keyframes fadeUp {
            from { opacity: 0; transform: translateY(32px); }
            to   { opacity: 1; transform: translateY(0); }
        }

        /* Logo / Título */
        .logo-block {
            text-align: center;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 12px;
        }

        .logo-icon {
            width: 56px;
            height: 56px;
            border: 2px solid rgba(255,255,255,0.5);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 4px;
        }

        .logo-icon svg {
            width: 30px;
            height: 30px;
            fill: white;
        }

        h1 {
            font-family: 'Bebas Neue', sans-serif;
            font-size: clamp(52px, 10vw, 96px);
            letter-spacing: 10px;
            line-height: 1;
            color: var(--white);
            text-transform: uppercase;
        }

        .subtitle {
            font-size: 12px;
            letter-spacing: 5px;
            text-transform: uppercase;
            color: var(--gray-light);
            font-weight: 300;
            border-top: 1px solid rgba(255,255,255,0.15);
            padding-top: 12px;
            width: 100%;
            text-align: center;
        }

        /* Cards de navegação */
        .nav-cards {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
            justify-content: center;
        }

        .nav-card {
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            gap: 12px;
            text-decoration: none;
            color: white;
            background: rgba(255,255,255,0.04);
            border: 1px solid rgba(255,255,255,0.12);
            border-radius: 14px;
            padding: 28px 32px;
            width: 220px;
            height: 220px;
            position: relative;
            overflow: hidden;
            transition: background 0.25s, border-color 0.25s, transform 0.25s;
            animation: fadeUp 0.8s cubic-bezier(0.22, 1, 0.36, 1) both;
        }

        .nav-card:nth-child(1) { animation-delay: 0.1s; }
        .nav-card:nth-child(2) { animation-delay: 0.22s; }

        .nav-card::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(255,255,255,0.06) 0%, transparent 60%);
            opacity: 0;
            transition: opacity 0.3s;
        }

        .nav-card:hover {
            background: rgba(255,255,255,0.09);
            border-color: rgba(255,255,255,0.4);
            transform: translateY(-4px);
        }

        .nav-card:hover::before { opacity: 1; }

        .card-icon {
            width: 40px;
            height: 40px;
            background: rgba(255,255,255,0.1);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .card-icon svg {
            width: 20px;
            height: 20px;
            stroke: white;
            fill: none;
            stroke-width: 1.8;
            stroke-linecap: round;
            stroke-linejoin: round;
        }

        .card-label {
            font-size: 11px;
            letter-spacing: 3px;
            text-transform: uppercase;
            color: var(--gray-light);
            font-weight: 400;
        }

        .card-title {
            font-family: 'Bebas Neue', sans-serif;
            font-size: 26px;
            letter-spacing: 3px;
            line-height: 1;
        }

        .card-desc {
            font-size: 12px;
            color: rgba(255,255,255,0.45);
            line-height: 1.8;
            font-weight: 300;
        }

        .card-arrow {
            position: absolute;
            bottom: 24px;
            right: 24px;
            width: 28px;
            height: 28px;
            border: 1px solid rgba(255,255,255,0.2);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background 0.2s, border-color 0.2s;
        }

        .nav-card:hover .card-arrow {
            background: rgba(255,255,255,0.15);
            border-color: rgba(255,255,255,0.5);
        }

        .card-arrow svg {
            width: 12px;
            height: 12px;
            stroke: white;
            fill: none;
            stroke-width: 2;
            stroke-linecap: round;
            stroke-linejoin: round;
        }

        /* Rodapé */
        .footer {
            position: fixed;
            bottom: 18px;
            font-size: 10px;
            letter-spacing: 3px;
            text-transform: uppercase;
            color: rgba(255,255,255,0.2);
        }  
/* Seletor de instrumentos */
.instrument-selector {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.selector-label {
    font-size: 11px;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: var(--gray-light);
    font-weight: 300;
}

.tabs-row {
    display: flex;
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 12px;
    overflow: hidden;
}

.tab-btn {
    background: transparent;
    border: none;
    border-right: 1px solid rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.45);
    font-family: 'DM Sans', sans-serif;
    font-size: 11px;
    letter-spacing: 3px;
    text-transform: uppercase;
    padding: 10px 22px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 7px;
    transition: all 0.2s;
}

.tab-btn:last-child { border-right: none; }

.tab-btn.active {
    background: rgba(255,255,255,0.12);
    color: var(--white);
}

.tab-btn:hover:not(.active) {
    background: rgba(255,255,255,0.06);
    color: rgba(255,255,255,0.7);
}

.tab-icon {
    width: 14px;
    height: 14px;
    stroke: currentColor;
    fill: none;
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.tab-panel.hidden { display: none; }

.inst-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.inst-card {
    display: flex;
    flex-direction: column;
    gap: 8px;
    text-decoration: none;
    color: var(--white);
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 14px;
    padding: 20px 16px 36px;
    position: relative;
    transition: background 0.25s, border-color 0.25s, transform 0.25s;
    min-width: 160px;
}

.inst-card:hover {
    background: rgba(255,255,255,0.09);
    border-color: rgba(255,255,255,0.4);
    transform: translateY(-4px);
}
/* Dropdown de instrumentos */
.inst-wrapper {
    position: relative;
    width: 220px;
}

.nav-card.open {
    background: rgba(255,255,255,0.09);
    border-color: rgba(255,255,255,0.4);
    transform: translateY(-4px);
    cursor: pointer;
}

.nav-card.open .card-arrow {
    transform: rotate(90deg);
    background: rgba(255,255,255,0.15);
    border-color: rgba(255,255,255,0.5);
}

.inst-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: #1a1a1a;
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 12px;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity 0.2s, transform 0.2s;
    z-index: 100;
}

.inst-dropdown.open {
    opacity: 1;
    pointer-events: all;
    transform: translateY(0);
}

.inst-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 18px;
    text-decoration: none;
    color: rgba(255,255,255,0.75);
    font-size: 13px;
    letter-spacing: 2px;
    text-transform: uppercase;
    border-bottom: 1px solid rgba(255,255,255,0.07);
    transition: background 0.15s, color 0.15s;
}

.inst-link:last-child { border-bottom: none; }

.inst-link:hover {
    background: rgba(255,255,255,0.08);
    color: #fff;
}

.inst-link svg {
    width: 16px;
    height: 16px;
    stroke: currentColor;
    fill: none;
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
    opacity: 0.6;
    flex-shrink: 0;
}