/* ========================================
   Drum Machine — Neon Orange / MPC Theme
   ======================================== */
:root {
    --primary: #F97316;
    --primary-hover: #EA580C;
    --primary-glow: rgba(249, 115, 22, 0.3);
    --secondary: #FB923C;
    --accent: #FDBA74;
    --bg: #1A1008;
    --bg-card: rgba(26, 18, 10, 0.85);
    --bg-cell: rgba(30, 22, 14, 0.6);
    --bg-cell-on: rgba(249, 115, 22, 0.2);
    --bg-hover: #2A1A0E;
    --border: rgba(249, 115, 22, 0.12);
    --border-hover: rgba(249, 115, 22, 0.35);
    --text: #FFF5EB;
    --text-secondary: #C4A882;
    --text-muted: #8B7355;
    --radius: 8px;
    --radius-sm: 6px;
    --font: 'Inter', -apple-system, sans-serif;
    --transition: 0.2s ease;
}

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    background-image: radial-gradient(ellipse at 50% 0%, rgba(249, 115, 22, 0.04) 0%, transparent 50%);
}

.app {
    max-width: 900px;
    margin: 0 auto;
    padding: 1.5rem 1rem 3rem;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.logo-icon {
    font-size: 1.4rem;
}

.logo h1 {
    font-size: 1.2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.kit-selector {
    display: flex;
    gap: 0.3rem;
}

.kit-btn {
    padding: 0.35rem 0.7rem;
    border: 1px solid var(--border);
    background: transparent;
    border-radius: 100px;
    font-family: var(--font);
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}

.kit-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.kit-btn.active {
    background: rgba(249, 115, 22, 0.15);
    border-color: var(--primary);
    color: var(--text);
    box-shadow: 0 0 8px var(--primary-glow);
}

/* Transport Bar */
.transport-bar {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.transport-left,
.transport-right {
    display: flex;
    gap: 0.35rem;
}

.transport-center {
    flex: 1;
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.transport-btn {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border);
    background: var(--bg-cell);
    border-radius: var(--radius-sm);
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    color: var(--text);
}

.transport-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-hover);
}

.transport-btn.playing {
    background: rgba(249, 115, 22, 0.2);
    border-color: var(--primary);
    box-shadow: 0 0 12px var(--primary-glow);
}

.action-btn {
    padding: 0.4rem 0.65rem;
    border: 1px solid var(--border);
    background: transparent;
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}

.action-btn:hover {
    background: var(--bg-hover);
    color: var(--text);
}

.knob-group {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.knob-group label {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.knob-group input[type="range"] {
    width: 80px;
    accent-color: var(--primary);
}

.knob-value {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--primary);
    min-width: 30px;
    font-variant-numeric: tabular-nums;
}

/* Sequencer Grid */
.sequencer {
    overflow-x: auto;
}

.seq-row {
    display: flex;
    align-items: center;
    gap: 2px;
    margin-bottom: 2px;
}

.seq-label {
    width: 70px;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    flex-shrink: 0;
    padding-right: 0.4rem;
    text-align: right;
}

.seq-vol {
    width: 40px;
    flex-shrink: 0;
}

.seq-vol input {
    width: 36px;
    accent-color: var(--primary);
}

.seq-cells {
    display: flex;
    gap: 2px;
    flex: 1;
}

.seq-cell {
    width: 48px;
    height: 40px;
    border: 1px solid var(--border);
    background: var(--bg-cell);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.1s;
    flex-shrink: 0;
    position: relative;
}

.seq-cell:hover {
    background: var(--bg-hover);
    border-color: var(--border-hover);
}

.seq-cell.on {
    background: var(--bg-cell-on);
    border-color: var(--primary);
    box-shadow: inset 0 0 8px var(--primary-glow);
}

.seq-cell.on::after {
    content: '';
    position: absolute;
    inset: 6px;
    background: var(--primary);
    border-radius: 3px;
    opacity: 0.6;
}

.seq-cell.active-col {
    border-color: var(--accent);
    box-shadow: 0 0 6px rgba(253, 186, 116, 0.3);
}

/* Beat markers */
.seq-cell:nth-child(4n+1) {
    margin-left: 4px;
}

/* Pattern Bank */
.pattern-bank {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1rem;
    padding: 0.6rem 0.85rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    flex-wrap: wrap;
}

.bank-label {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.pattern-btns {
    display: flex;
    gap: 0.3rem;
}

.pat-btn {
    width: 34px;
    height: 28px;
    border: 1px solid var(--border);
    background: transparent;
    border-radius: 4px;
    font-family: var(--font);
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}

.pat-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.pat-btn.active {
    background: rgba(249, 115, 22, 0.15);
    border-color: var(--primary);
    color: var(--text);
}

.pat-btn.has-data {
    box-shadow: inset 0 -2px 0 var(--primary);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    padding: 0.55rem 1rem;
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-size: 0.82rem;
    font-weight: 500;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 100;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.hidden {
    display: none !important;
}

@media (max-width: 700px) {
    .seq-cell {
        width: 36px;
        height: 32px;
    }

    .seq-label {
        width: 50px;
        font-size: 0.65rem;
    }

    .seq-vol {
        display: none;
    }

    .transport-center {
        justify-content: flex-start;
    }
}