/* ════════════════════════════════════════════════════════════
   ROTATE OVERLAY (solo visible en portrait mobile)
   ════════════════════════════════════════════════════════════ */
.rotate-overlay {
    display: none; /* oculto por defecto (escritorio) */
    position: fixed;
    inset: 0;
    background: #0f172a;
    z-index: 99999;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: white;
    padding: 2rem;
}

@media (max-width: 768px) and (orientation: portrait) {
    .rotate-overlay {
        display: flex;
    }
}

.rotate-content { max-width: 300px; }

.rotate-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    animation: rotateHint 1.5s ease-in-out infinite;
}

@keyframes rotateHint {
    0%   { transform: rotate(0deg); }
    25%  { transform: rotate(-15deg); }
    50%  { transform: rotate(90deg); }
    75%  { transform: rotate(90deg); }
    100% { transform: rotate(90deg); }
}

.rotate-content h2 {
    font-size: 1.8rem;
    color: #38bdf8;
    margin-bottom: 0.5rem;
}

.rotate-content p {
    color: #94a3b8;
    font-size: 1rem;
}

/* ════════════════════════════════════════════════════════════
   STUDIO BASE LAYOUT
   ════════════════════════════════════════════════════════════ */
.studio-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: radial-gradient(circle at center, #1e293b, #0f172a);
    color: white;
}

.studio-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255,255,255,0.08);
    flex-shrink: 0;
}

.back-btn {
    color: #94a3b8;
    font-weight: 600;
    transition: color 0.2s;
}

.back-btn:hover { color: white; }

.studio-title {
    font-size: 1.4rem;
    font-weight: 800;
    background: linear-gradient(to right, #c084fc, #38bdf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin: 0;
}

.instrument-toggle {
    display: flex;
    background: #1e293b;
    border-radius: 8px;
    padding: 4px;
    gap: 4px;
}

.toggle-btn {
    background: transparent;
    border: none;
    color: #94a3b8;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    font-family: inherit;
    font-size: 0.9rem;
    transition: all 0.25s;
}

.toggle-btn.active {
    background: #3b82f6;
    color: white;
    box-shadow: 0 2px 8px rgba(59,130,246,0.4);
}

.studio-main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1.5rem 2rem;
}

.instrument-container {
    width: 100%;
    max-width: 1000px;
    display: none;
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.4s, transform 0.4s;
}

.instrument-container.active {
    display: block;
    animation: fadeIn 0.4s forwards;
}

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

/* Controls / subtitles */
.piano-controls, .drums-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.control-label {
    font-size: 1.1rem;
    font-weight: 800;
    color: #cbd5e1;
}

.keyboard-hint {
    font-size: 0.8rem;
    color: #64748b;
    background: rgba(255,255,255,0.05);
    padding: 4px 12px;
    border-radius: 20px;
}

/* ════════════════════════════════════════════════════════════
   PIANO
   ════════════════════════════════════════════════════════════ */
.piano-wrapper {
    background: linear-gradient(180deg, #334155 0%, #1e293b 100%);
    padding: 1.5rem 1.5rem 0;
    border-radius: 16px;
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.6),
                inset 0 1px 0 rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.08);
}

.piano-keys {
    display: flex;
    position: relative;
    height: 260px;
    background: #0a0f1e;
    border-radius: 4px 4px 0 0;
    border: 4px solid #0a0f1e;
    border-bottom: none;
    overflow: hidden;
}

.key-white {
    flex: 1;
    background: linear-gradient(to bottom, #ffffff 0%, #f1f5f9 100%);
    border-right: 1px solid #c8d4e0;
    border-top: none;
    border-bottom: none;
    border-radius: 0 0 5px 5px;
    position: relative;
    z-index: 1;
    cursor: pointer;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 0.75rem;
    box-shadow: inset -1px 0 0 #eee, inset 0 -5px 6px rgba(0,0,0,0.08);
    transition: background 0.07s;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.key-white:first-child { border-radius: 0 0 5px 5px; }
.key-white:last-child  { border-right: none; }

.key-white.active {
    background: linear-gradient(to bottom, #dde9f7 0%, #b8ccde 100%);
    box-shadow: inset 0 -2px 4px rgba(0,0,0,0.15);
}

.key-black {
    width: 5.3%;
    height: 58%;
    background: linear-gradient(to bottom, #1e293b 0%, #0f172a 70%, #1e293b 100%);
    position: absolute;
    top: 0;
    z-index: 2;
    border-radius: 0 0 5px 5px;
    cursor: pointer;
    box-shadow: 2px 3px 6px rgba(0,0,0,0.5), inset 0 -3px 4px rgba(255,255,255,0.15);
    transform: translateX(-50%);
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    transition: background 0.07s;
}

.key-black.active {
    background: linear-gradient(to bottom, #334155 0%, #0f172a 100%);
    box-shadow: 1px 1px 3px rgba(0,0,0,0.6), inset 0 -1px 2px rgba(255,255,255,0.08);
}

.key-label {
    color: #94a3b8;
    font-size: 0.75rem;
    font-weight: 700;
    pointer-events: none;
}

/* ════════════════════════════════════════════════════════════
   OCTAPAD
   ════════════════════════════════════════════════════════════ */
.drums-wrapper {
    background: #1a2235;
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.6);
    border: 1px solid rgba(255,255,255,0.08);
}

.octapad {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.2rem;
}

.pad-btn {
    aspect-ratio: 1;
    border: 3px solid rgba(255,255,255,0.15);
    border-radius: 14px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 0.4rem;
    color: white;
    transition: transform 0.08s, box-shadow 0.08s, filter 0.08s;
    position: relative;
    overflow: hidden;
    font-family: inherit;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

/* Colores únicos por pad para reconocimiento visual rápido */
.pad-crash     { background: linear-gradient(135deg, #7c3aed, #5b21b6); box-shadow: 0 8px 20px rgba(124,58,237,0.3); }
.pad-ride      { background: linear-gradient(135deg, #2563eb, #1d4ed8); box-shadow: 0 8px 20px rgba(37,99,235,0.3); }
.pad-tom1      { background: linear-gradient(135deg, #0891b2, #0e7490); box-shadow: 0 8px 20px rgba(8,145,178,0.3); }
.pad-hihat-open{ background: linear-gradient(135deg, #059669, #047857); box-shadow: 0 8px 20px rgba(5,150,105,0.3); }
.pad-tom2      { background: linear-gradient(135deg, #d97706, #b45309); box-shadow: 0 8px 20px rgba(217,119,6,0.3); }
.pad-snare     { background: linear-gradient(135deg, #dc2626, #b91c1c); box-shadow: 0 8px 20px rgba(220,38,38,0.35); }
.pad-hihat     { background: linear-gradient(135deg, #16a34a, #15803d); box-shadow: 0 8px 20px rgba(22,163,74,0.3); }
.pad-kick      { background: linear-gradient(135deg, #9f1239, #881337); box-shadow: 0 8px 20px rgba(159,18,57,0.4); }

.pad-btn.active {
    transform: scale(0.93) translateY(3px);
    filter: brightness(1.4);
    box-shadow: none;
}

/* Ripple on hit */
.pad-btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255,255,255,0);
    transition: background 0.12s;
    border-radius: inherit;
}

.pad-btn.active::after {
    background: rgba(255,255,255,0.18);
}

.pad-name {
    font-weight: 800;
    font-size: 1rem;
    z-index: 1;
    text-shadow: 0 1px 3px rgba(0,0,0,0.5);
}

.pad-key {
    background: rgba(0,0,0,0.3);
    padding: 2px 10px;
    border-radius: 4px;
    font-size: 0.8rem;
    color: rgba(255,255,255,0.7);
    font-family: monospace;
    font-weight: 700;
    z-index: 1;
    letter-spacing: 1px;
}

/* ════════════════════════════════════════════════════════════
   LOADING OVERLAY
   ════════════════════════════════════════════════════════════ */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: #0f172a;
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    transition: opacity 0.5s;
}

.loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.loader-content { text-align: center; }

.loader-content h2 {
    font-size: 1.8rem;
    margin: 1rem 0 0.4rem;
    color: #38bdf8;
}

.loader-content p {
    color: #94a3b8;
    margin: 0.25rem 0;
}

.loading-note {
    color: #34d399 !important;
    font-weight: 600;
    font-size: 0.9rem;
}

.spinner {
    width: 56px; height: 56px;
    border: 6px solid #1e293b;
    border-top-color: #38bdf8;
    border-radius: 50%;
    animation: spin 0.9s linear infinite;
    margin: 0 auto;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ════════════════════════════════════════════════════════════
   RESPONSIVE — mobile landscape
   ════════════════════════════════════════════════════════════ */
@media (max-width: 768px) {
    .studio-header {
        padding: 0.75rem 1rem;
        gap: 0.5rem;
    }

    .studio-title { font-size: 1.1rem; }
    .toggle-btn { padding: 6px 10px; font-size: 0.8rem; }
    .back-btn { font-size: 0.85rem; }

    .studio-main { padding: 0.75rem 1rem; }

    .piano-keys { height: 200px; }
    .key-black { width: 6%; }

    .octapad {
        grid-template-columns: repeat(4, 1fr);
        gap: 0.75rem;
    }

    .pad-name { font-size: 0.75rem; }
    .pad-key  { font-size: 0.7rem; padding: 2px 6px; }

    .keyboard-hint { display: none; } /* En móvil no sirven los atajos de teclado */
}