/* ===== CSS CUSTOM PROPERTIES ===== */
:root {
    --bg-color: #050508;
    --primary-glow: #00f3ff;
    --secondary-glow: #bc13fe;
    --node-bg: rgba(255, 255, 255, 0.05);
    --node-border: rgba(255, 255, 255, 0.2);
    --font-display: 'Orbitron', sans-serif;
    --font-ui: 'Rajdhani', sans-serif;

    /* Sphere dimensions — overridden in breakpoints */
    --sphere-size: 400px;
    --node-size: 80px;
    --node-radius: 100px;
    --node-top: calc(var(--sphere-size) / 2 - var(--node-radius) - var(--node-size) / 2);
    --core-size: 140px;
    --note-font: 1.5rem;
    --toolbar-height: 0px;
}

/* ===== RESET ===== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

/* ===== BASE ===== */
html {
    height: 100%;
    height: -webkit-fill-available;
}

body {
    background-color: var(--bg-color);
    color: #fff;
    font-family: var(--font-ui);
    min-height: 100vh;
    min-height: -webkit-fill-available;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    background-image: radial-gradient(circle at 50% 50%, #1a1a3a 0%, #050508 70%);
}

/* ===== OVERLAYS ===== */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(5, 5, 8, 0.95);
    z-index: 100;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    backdrop-filter: blur(10px);
    transition: opacity 0.5s ease;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 20px;
}

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

.overlay-content {
    max-width: 700px;
    width: 100%;
    text-align: center;
    padding: 40px 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: auto;
}

.overlay-content h1 {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 8vw, 3.5rem);
    margin-bottom: 25px;
    color: var(--primary-glow);
    letter-spacing: 8px;
    text-shadow: 0 0 20px rgba(0, 243, 255, 0.3);
}

.overlay-content .description {
    font-size: clamp(0.9rem, 3vw, 1.1rem);
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 30px;
    letter-spacing: 1px;
}

.overlay-content .requirement {
    font-family: var(--font-display);
    font-size: clamp(0.65rem, 2vw, 0.8rem);
    color: var(--secondary-glow);
    border: 1px solid rgba(188, 19, 254, 0.3);
    padding: 8px 16px;
    margin-bottom: 40px;
    letter-spacing: 2px;
    border-radius: 4px;
    background: rgba(188, 19, 254, 0.05);
    text-align: center;
}

#start-btn {
    padding: 15px 40px;
    font-family: var(--font-display);
    font-size: 1.2rem;
    cursor: pointer;
    background: transparent;
    border: 1px solid var(--primary-glow);
    color: var(--primary-glow);
    transition: 0.3s;
    width: min(250px, 80vw);
    touch-action: manipulation;
}

#start-btn:hover,
#start-btn:active {
    background: var(--primary-glow);
    color: #000;
    box-shadow: 0 0 20px var(--primary-glow);
}

.start-back-btn {
    display: inline-block;
    margin-top: 15px;
    padding: 15px 40px;
    font-family: var(--font-display);
    font-size: 1.2rem;
    text-decoration: none;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: rgba(255, 255, 255, 0.6);
    transition: 0.3s;
    cursor: pointer;
    width: min(250px, 80vw);
    text-align: center;
    touch-action: manipulation;
}

.start-back-btn:hover,
.start-back-btn:active {
    background: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.9);
    border-color: rgba(255, 255, 255, 0.6);
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.2);
}

/* ===== CONTAINER ===== */
.container {
    width: 100%;
    height: 100%;
    height: 100dvh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    position: relative;
    overflow: hidden;
}

/* ===== HEADER ===== */
header {
    width: 100%;
    padding: 16px 40px 12px;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    z-index: 10;
    flex-shrink: 0;
    gap: 12px;
    flex-wrap: nowrap;
    overflow: visible;
}

.header-top-row {
    display: contents; /* On desktop, logo is inline with the row */
}

.logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    letter-spacing: 2px;
    white-space: nowrap;
    flex-shrink: 0;
}

.version {
    font-size: 0.8rem;
    color: var(--secondary-glow);
    margin-left: 10px;
}

.status-panel {
    display: flex;
    gap: 12px;
    font-size: 0.85rem;
    text-transform: uppercase;
    align-items: center;
    flex-wrap: nowrap;
    flex-shrink: 1;
    flex-grow: 1;
    min-width: 0;
    overflow-x: auto;
    overflow-y: visible;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    padding: 2px 4px;
}

.status-panel::-webkit-scrollbar { display: none; }

.status-item {
    display: flex;
    align-items: center;
    gap: 4px;
    white-space: nowrap;
}

.status-item span {
    color: var(--primary-glow);
    margin-left: 4px;
}

/* Tappable status items */
.status-item.tappable {
    cursor: pointer;
    padding: 5px 10px;
    border-radius: 6px;
    border: 1px solid transparent;
    transition: background 0.2s, border-color 0.2s;
    touch-action: manipulation;
}

.status-item.tappable:hover {
    background: rgba(0, 243, 255, 0.08);
    border-color: rgba(0, 243, 255, 0.25);
}

.status-item.tappable:active {
    background: rgba(0, 243, 255, 0.15);
    border-color: rgba(0, 243, 255, 0.5);
    transform: scale(0.97);
}

/* Octave inline +/- */
.octave-mini-btn {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.25);
    color: rgba(255, 255, 255, 0.6);
    width: 22px;
    height: 22px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: 0.2s;
    padding: 0;
    line-height: 1;
    flex-shrink: 0;
    touch-action: manipulation;
}

.octave-mini-btn:hover,
.octave-mini-btn:active {
    color: var(--primary-glow);
    border-color: var(--primary-glow);
    background: rgba(0, 243, 255, 0.1);
}

/* Back to SA — top-left corner (used on both overlay and instrument header) */
.back-to-sa-corner {
    font-family: var(--font-ui);
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.45);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 1px;
    white-space: nowrap;
    padding: 5px 10px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 4px;
    background: transparent;
    transition: 0.2s;
    flex-shrink: 0;
    touch-action: manipulation;
    cursor: pointer;
}

.back-to-sa-corner:hover,
.back-to-sa-corner:active {
    color: #fff;
    border-color: rgba(255, 255, 255, 0.45);
    background: rgba(255, 255, 255, 0.07);
}

/* When inside the start overlay, position it absolutely at top-left */
#start-overlay > .back-to-sa-corner {
    position: absolute;
    top: 16px;
    left: 16px;
}

/* Hamburger (mobile only) */
.hamburger-btn {
    display: none;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.25);
    color: rgba(255, 255, 255, 0.7);
    font-size: 1.3rem;
    padding: 6px 10px;
    cursor: pointer;
    border-radius: 4px;
    flex-shrink: 0;
    touch-action: manipulation;
    transition: 0.2s;
}

.hamburger-btn:active {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
}

/* Header controls */
.header-controls {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-shrink: 0;
}

.nav-btn {
    background: transparent;
    border: 1px solid var(--primary-glow);
    color: var(--primary-glow);
    padding: 8px 18px;
    font-family: var(--font-display);
    font-size: 0.85rem;
    cursor: pointer;
    transition: 0.3s;
    letter-spacing: 1px;
    white-space: nowrap;
    touch-action: manipulation;
}

.nav-btn:hover,
.nav-btn:active {
    background: var(--primary-glow);
    color: #000;
    box-shadow: 0 0 15px var(--primary-glow);
}

.nav-btn.morph-highlight {
    border-color: var(--secondary-glow);
    color: var(--secondary-glow);
}

.nav-btn.morph-highlight:hover,
.nav-btn.morph-highlight:active {
    background: var(--secondary-glow);
    color: #fff;
    box-shadow: 0 0 20px var(--secondary-glow);
}

.nav-btn.active {
    background: var(--primary-glow);
    color: #000;
    box-shadow: 0 0 20px var(--primary-glow);
}

.back-link {
    font-family: var(--font-ui);
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 8px 16px;
    font-size: 0.9rem;
    transition: 0.3s;
    text-transform: uppercase;
    white-space: nowrap;
    touch-action: manipulation;
}

.back-link:hover,
.back-link:active {
    color: #fff;
    border-color: #fff;
    background: rgba(255, 255, 255, 0.1);
}

#morph-display {
    color: var(--secondary-glow) !important;
    font-weight: 700;
}

/* ===== CONTROLS MODAL ===== */
.controls-modal {
    background: rgba(10, 10, 15, 0.97);
    border: 1px solid var(--primary-glow);
    padding: 40px 30px;
    border-radius: 10px;
    width: 95%;
    max-width: 800px;
    position: relative;
    box-shadow: 0 0 50px rgba(0, 243, 255, 0.2);
    color: #fff;
    max-height: 85vh;
    overflow-y: auto;
}

.close-btn {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 2rem;
    color: rgba(255, 255, 255, 0.5);
    background: none;
    border: none;
    cursor: pointer;
    transition: 0.3s;
    touch-action: manipulation;
}

.close-btn:hover,
.close-btn:active {
    color: var(--secondary-glow);
}

.controls-modal h2 {
    font-family: var(--font-display);
    text-align: center;
    color: var(--primary-glow);
    margin-bottom: 30px;
    letter-spacing: 2px;
}

.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
}

.control-group {
    background: rgba(255, 255, 255, 0.03);
    padding: 18px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.control-group h3 {
    font-family: var(--font-display);
    color: var(--secondary-glow);
    margin-bottom: 12px;
    font-size: 0.85rem;
}

.control-group p {
    font-family: var(--font-ui);
    color: rgba(255, 255, 255, 0.5);
    margin-top: 8px;
    font-size: 0.8rem;
}

.key-row {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}

.key-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.key-item {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    font-family: var(--font-ui);
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
    flex-wrap: wrap;
}

.key {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 4px 8px;
    border-radius: 4px;
    font-family: var(--font-display);
    color: #fff;
    min-width: 28px;
    display: inline-block;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.5);
    font-size: 0.75rem;
}

/* ===== INSTRUMENT INTERFACE ===== */
.instrument-interface {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    width: 100%;
    min-height: 0;
    padding: 0 10px;
    overflow: hidden;
}

/* ===== SPHERE WRAPPER ===== */
.sphere-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    width: 100%;
}

.controllers-container {
    display: flex;
    gap: 40px;
    justify-content: center;
    align-items: center;
    position: relative;
}

/* ===== SPHERE CONTAINER ===== */
.sphere-container {
    width: var(--sphere-size);
    height: var(--sphere-size);
    position: relative;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.05), rgba(0, 0, 0, 0.8));
    box-shadow:
        0 0 60px rgba(0, 243, 255, 0.05),
        inset 0 0 40px rgba(0, 0, 0, 0.8),
        inset 2px 2px 10px rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
    transition: opacity 0.3s, transform 0.3s;
}

/* ===== CENTRAL CORE ===== */
.core-node {
    width: var(--core-size);
    height: var(--core-size);
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.5);
    border: 2px solid rgba(188, 19, 254, 0.3);
    position: absolute;
    z-index: 2;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
    transition: all 0.1s ease;
}

.core-inner {
    width: 80%;
    height: 80%;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(188, 19, 254, 0.2), transparent);
    opacity: 0.5;
}

.core-node.pulse {
    transform: scale(0.95);
    border-color: var(--secondary-glow);
    box-shadow: 0 0 50px rgba(188, 19, 254, 0.5);
}

.core-node.pulse .core-inner {
    background: radial-gradient(circle, rgba(188, 19, 254, 0.8), transparent);
    opacity: 1;
}

.core-node.kick-pulse {
    transform: scale(1.1);
    border-color: #fff;
    box-shadow: 0 0 60px rgba(255, 255, 255, 0.8);
}

.core-node.kick-pulse .core-inner {
    background: radial-gradient(circle, #fff, transparent);
    opacity: 1;
}

/* ===== RADIAL NODES ===== */
.node-wrapper {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    animation: spinAppearance 1s ease-out;
    pointer-events: none;
    display: block;
    transform: rotate(calc(var(--i) * 72deg - 90deg));
}

.note-node {
    position: absolute;
    left: 50%;
    top: var(--node-top);
    width: var(--node-size);
    height: var(--node-size);
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(0, 243, 255, 0.2);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    pointer-events: auto;
    transform: translateX(-50%) rotate(calc((var(--i) * 72deg - 90deg) * -1));
    transform-origin: center center;
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.5);
    transition: all 0.1s;
    touch-action: manipulation;
}

.note-node .note-label {
    font-size: var(--note-font);
    font-weight: 700;
    color: rgba(255, 255, 255, 0.6);
    pointer-events: none;
}

.note-node.active {
    background: rgba(0, 243, 255, 0.2);
    border-color: var(--primary-glow);
    box-shadow:
        0 0 30px rgba(0, 243, 255, 0.4),
        inset 0 0 10px rgba(0, 243, 255, 0.6);
    transform: translateX(-50%) rotate(calc((var(--i) * 72deg - 90deg) * -1)) scale(1.1);
}

.note-node.active .note-label {
    color: #fff;
    text-shadow: 0 0 10px #fff;
}

/* ===== OCTAVE BUTTONS ===== */
.octave-btn {
    width: 54px;
    height: 54px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.2);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.5);
    transition: 0.2s;
    background: rgba(0, 0, 0, 0.3);
    flex-shrink: 0;
    touch-action: manipulation;
}

.octave-btn:hover {
    border-color: #fff;
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
}

.octave-btn:active,
.octave-btn.active {
    background: #fff;
    color: #000;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.5);
    transform: scale(0.93);
}

/* ===== SPHERE INDICATOR (portrait) ===== */
.sphere-indicator {
    display: none;
    gap: 10px;
    justify-content: center;
    align-items: center;
    position: absolute;
    bottom: -28px;
    left: 50%;
    transform: translateX(-50%);
}

.sphere-dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    cursor: pointer;
    transition: 0.25s;
    touch-action: manipulation;
}

.sphere-dot.active {
    background: var(--primary-glow);
    box-shadow: 0 0 8px var(--primary-glow);
}

/* ===== BPM CONTROL ===== */
.bpm-control {
    margin-top: 36px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-ui);
    color: rgba(255, 255, 255, 0.4);
    transition: opacity 0.3s;
    background: rgba(0, 0, 0, 0.3);
    padding: 5px 14px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.bpm-control:hover {
    color: rgba(243, 243, 255, 0.8);
    border-color: rgba(255, 255, 255, 0.3);
}

.bpm-control label {
    font-size: 0.8rem;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.bpm-control input {
    background: transparent;
    border: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--primary-glow);
    font-family: var(--font-display);
    font-size: 1rem;
    width: 52px;
    text-align: center;
    padding: 2px;
}

.bpm-control input:focus {
    outline: none;
    border-color: var(--primary-glow);
}

.bpm-control input::-webkit-outer-spin-button,
.bpm-control input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.bpm-control input[type=number] {
    -moz-appearance: textfield;
    appearance: textfield;
}

.bpm-adj {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.5);
    width: 26px;
    height: 26px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: 0.2s;
    flex-shrink: 0;
    touch-action: manipulation;
    padding: 0;
}

.bpm-adj:hover,
.bpm-adj:active {
    color: var(--primary-glow);
    border-color: var(--primary-glow);
    background: rgba(0, 243, 255, 0.1);
}

/* ===== FOOTER ===== */
.footer-copyright {
    margin-top: 16px;
    color: rgba(255, 255, 255, 0.2);
    font-family: var(--font-ui);
    font-size: 0.75rem;
    letter-spacing: 1px;
}

/* ===== MOBILE TOOLBAR ===== */
.mobile-toolbar {
    display: none;
    width: 100%;
    height: 64px;
    background: rgba(5, 5, 10, 0.97);
    border-top: 1px solid rgba(0, 243, 255, 0.18);
    z-index: 50;
    align-items: stretch;
    flex-shrink: 0;
    /* iPhone safe area */
    padding-bottom: env(safe-area-inset-bottom, 0px);
}

.tool-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-right: 1px solid rgba(255, 255, 255, 0.05);
    color: rgba(255, 255, 255, 0.55);
    cursor: pointer;
    gap: 3px;
    transition: 0.18s;
    padding: 8px 2px;
    touch-action: manipulation;
}

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

.tool-btn:active,
.tool-btn.active {
    color: var(--primary-glow);
    background: rgba(0, 243, 255, 0.07);
}

.tool-btn#beat-btn.active {
    color: #00ff88;
    background: rgba(0, 255, 136, 0.07);
}

.tool-btn#mobile-auto-btn.active {
    color: var(--primary-glow);
}

.tool-icon {
    font-size: 1.15rem;
    line-height: 1;
}

.tool-label {
    font-family: var(--font-display);
    font-size: 0.52rem;
    letter-spacing: 0.8px;
}

/* ===== ANIMATIONS ===== */
.morph-glow {
    animation: morphPulse 0.5s ease-out;
}

@keyframes morphPulse {
    0% { filter: hue-rotate(0deg) brightness(1); }
    50% { filter: hue-rotate(90deg) brightness(2); }
    100% { filter: hue-rotate(0deg) brightness(1); }
}

@keyframes spinAppearance {
    from {
        opacity: 0;
        transform: rotate(calc(var(--i) * 72deg - 90deg - 30deg)) scale(0.8);
    }
    to {
        opacity: 1;
        transform: rotate(calc(var(--i) * 72deg - 90deg));
    }
}


/* ===================================================================
   RESPONSIVE BREAKPOINTS
   =================================================================== */

/* --- Tablet / small desktop --- */
@media (max-width: 1100px) {
    :root {
        --sphere-size: 360px;
        --node-size: 74px;
        --node-radius: 96px;
        --core-size: 126px;
    }
    header { padding: 14px 24px 10px; }
}

/* --- Tablet portrait / large phone landscape --- */
@media (max-width: 820px) {
    :root {
        --sphere-size: min(320px, 42vw);
        --node-size: 66px;
        --node-radius: 86px;
        --core-size: 108px;
        --note-font: 1.2rem;
    }

    header {
        padding: 10px 16px 8px;
        gap: 8px;
    }

    .header-controls {
        gap: 8px;
    }

    .nav-btn {
        padding: 6px 12px;
        font-size: 0.78rem;
    }

    .back-link {
        padding: 6px 10px;
        font-size: 0.8rem;
    }

    .status-panel {
        gap: 8px;
        font-size: 0.8rem;
    }
}

/* --- Mobile (≤ 768px): show toolbar, responsive header --- */
@media (max-width: 768px) {
    :root {
        --toolbar-height: 64px;
    }

    body { overflow: hidden; }

    .container { padding-bottom: 0; }

    /* Mobile toolbar visible */
    .mobile-toolbar { display: flex; }

    /* Hamburger visible */
    .hamburger-btn { display: flex; }

    /* Header re-layout: logo row on top, status below, desktop controls hidden */
    header {
        flex-direction: column;
        align-items: flex-start;
        padding: 10px 14px 6px;
        gap: 6px;
    }

    .header-top-row {
        display: flex;
        justify-content: flex-start;
        align-items: center;
        width: 100%;
        gap: 10px;
    }

    /* Push hamburger to the far right */
    .header-top-row .hamburger-btn { margin-left: auto; }

    .logo { font-size: 1.1rem; letter-spacing: 1px; }
    .version { font-size: 0.7rem; }

    .status-panel {
        width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        flex-wrap: nowrap;
        gap: 4px;
        font-size: 0.75rem;
        padding-bottom: 4px;
        /* Hide scrollbar but allow scroll */
        scrollbar-width: none;
    }
    .status-panel::-webkit-scrollbar { display: none; }

    /* Hide desktop header controls — moved to toolbar/hamburger menu */
    .header-controls {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 8px;
        padding: 6px 0;
    }
    .header-controls.open {
        display: flex;
    }
    .header-controls .nav-btn,
    .header-controls .back-link {
        width: 100%;
        text-align: center;
    }

    /* Sphere */
    .controllers-container { gap: 30px; }

    .bpm-control { margin-top: 20px; }
    .footer-copyright { display: none; }

    /* Indicator visible on mobile */
    .sphere-indicator { display: flex; }
}

/* --- Portrait phone: one sphere at a time --- */
@media (orientation: portrait) and (max-width: 768px) {
    :root {
        --sphere-size: min(350px, 88vw);
        --node-size: 70px;
        --node-radius: 90px;
        --core-size: 112px;
        --note-font: 1.3rem;
    }

    .instrument-interface {
        justify-content: flex-start;
        padding-top: 10px;
        padding-left: 0;
        padding-right: 0;
    }

    /* Hide both spheres by default; show only portrait-active */
    .sphere-container { display: none; }
    .sphere-container.portrait-active { display: flex; }

    /* Side octave ± buttons hidden in portrait (inline ± in status bar used instead) */
    .octave-btn { display: none; }

    .sphere-wrapper { gap: 0; }
    .controllers-container { width: 100%; justify-content: center; }
}

/* --- Landscape phone: both spheres, compact everything --- */
@media (orientation: landscape) and (max-height: 520px) {
    :root {
        --sphere-size: min(210px, 32vw, calc(100vh - 150px));
        --node-size: 48px;
        --node-radius: 60px;
        --core-size: 68px;
        --note-font: 0.88rem;
        --toolbar-height: 56px;
    }

    header {
        padding: 6px 12px 4px;
        flex-direction: row;
        align-items: center;
        flex-wrap: nowrap;
        gap: 6px;
        position: relative;
    }

    .header-top-row { display: contents; }

    .logo { font-size: 0.9rem; }
    .version { display: none; }

    .status-panel {
        gap: 4px;
        font-size: 0.68rem;
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        flex-shrink: 1;
        min-width: 0;
    }
    .status-panel::-webkit-scrollbar { display: none; }

    .status-item.tappable { padding: 3px 6px; }

    .octave-mini-btn {
        width: 18px;
        height: 18px;
        font-size: 0.75rem;
    }

    /* Hide desktop header controls — accessible via MENU in toolbar */
    .header-controls {
        display: none;
        position: absolute;
        top: calc(100% + 4px);
        right: 12px;
        z-index: 30;
        background: rgba(5, 5, 8, 0.97);
        border: 1px solid rgba(0, 243, 255, 0.25);
        border-radius: 8px;
        padding: 12px 14px;
        flex-direction: column;
        gap: 8px;
        min-width: 200px;
        box-shadow: 0 4px 24px rgba(0, 0, 0, 0.7);
    }
    .header-controls.open { display: flex !important; }

    /* Both spheres shown in landscape */
    .sphere-container { display: flex !important; }
    .sphere-indicator { display: none; }

    .controllers-container { gap: 16px; }
    .sphere-wrapper { gap: 8px; }

    .octave-btn {
        width: 36px;
        height: 36px;
        font-size: 1.1rem;
    }

    .bpm-control { margin-top: 8px; font-size: 0.75rem; }
    .bpm-adj { width: 22px; height: 22px; }

    .instrument-interface { padding-top: 4px; }

    /* Show mobile toolbar in landscape too */
    .mobile-toolbar { display: flex; height: 56px; }
    .tool-icon { font-size: 1rem; }
    .tool-label { font-size: 0.48rem; }
}

/* --- Very small phones (e.g. iPhone SE portrait) --- */
@media (max-width: 375px) and (orientation: portrait) {
    :root {
        --sphere-size: min(300px, 88vw);
        --node-size: 62px;
        --node-radius: 80px;
        --core-size: 96px;
        --note-font: 1.1rem;
    }
}