/* =============================================
   Music Maker — Premium Dark Studio Theme
   ============================================= */

/* === Reset & Root Tokens === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg-primary: #0a0a12;
    --bg-secondary: #12121e;
    --bg-panel: rgba(18, 18, 35, 0.85);
    --bg-panel-solid: #14142a;
    --bg-input: rgba(255,255,255,0.04);
    --border: rgba(255,255,255,0.07);
    --border-active: rgba(139,92,246,0.5);
    --text-primary: #e8e8f0;
    --text-secondary: #9090b0;
    --text-muted: #606080;
    --accent: #8b5cf6;
    --accent-glow: rgba(139,92,246,0.35);
    --accent2: #06b6d4;
    --accent3: #f43f5e;
    --accent4: #10b981;
    --accent5: #f59e0b;
    --success: #10b981;
    --danger: #f43f5e;
    --glass: rgba(255,255,255,0.03);
    --glass-border: rgba(255,255,255,0.06);
    --radius: 12px;
    --radius-sm: 8px;
    --radius-xs: 4px;
    --shadow: 0 8px 32px rgba(0,0,0,0.4);
    --font: 'Inter', -apple-system, sans-serif;
    --font-display: 'Outfit', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --step-active: var(--accent);
    --step-active-glow: var(--accent-glow);
    --key-white: #f5f5f5;
    --key-black: #1a1a2e;
    --key-white-active: var(--accent);
    --key-black-active: var(--accent2);
}

[data-theme="light"] {
    --bg-primary: #f0f0f8;
    --bg-secondary: #e8e8f2;
    --bg-panel: rgba(255,255,255,0.85);
    --bg-panel-solid: #ffffff;
    --bg-input: rgba(0,0,0,0.04);
    --border: rgba(0,0,0,0.08);
    --text-primary: #1a1a2e;
    --text-secondary: #555570;
    --text-muted: #8888a0;
    --glass: rgba(255,255,255,0.6);
    --glass-border: rgba(0,0,0,0.08);
    --shadow: 0 8px 32px rgba(0,0,0,0.1);
    --key-white: #ffffff;
    --key-black: #2a2a3e;
}

html { font-size: 14px; scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* === Navbar === */
.navbar {
    position: sticky; top: 0; z-index: 100;
    background: var(--bg-panel);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 0.6rem 0;
}
.container { max-width: 1400px; margin: 0 auto; padding: 0 1rem; }
.nav-inner { display: flex; align-items: center; gap: 1rem; }
.brand { text-decoration: none; color: var(--text-primary); font-family: var(--font-display); font-weight: 700; font-size: 1.2rem; display: flex; align-items: center; gap: 0.4rem; white-space: nowrap; }
.brand span { background: linear-gradient(135deg, var(--accent), var(--accent2)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.nav-links { display: flex; align-items: center; gap: 0.5rem; margin-left: auto; flex-wrap: wrap; }
.nav-links a { color: var(--text-secondary); text-decoration: none; font-size: 0.85rem; padding: 0.35rem 0.6rem; border-radius: var(--radius-sm); transition: all 0.2s; }
.nav-links a:hover { color: var(--text-primary); background: var(--bg-input); }
.kofi-link { color: var(--accent3) !important; font-weight: 600 !important; }
.theme-btn { background: var(--bg-input); border: 1px solid var(--border); color: var(--text-primary); padding: 0.4rem 0.6rem; border-radius: var(--radius-sm); cursor: pointer; font-size: 1rem; transition: 0.2s; }
.theme-btn:hover { background: var(--accent-glow); }

/* === Button Styles === */
.btn { border: none; cursor: pointer; font-family: var(--font); font-weight: 500; border-radius: var(--radius-sm); transition: all 0.2s ease; display: inline-flex; align-items: center; gap: 0.3rem; }
.btn-sm { padding: 0.35rem 0.7rem; font-size: 0.8rem; }
.btn-primary { background: var(--accent); color: white; padding: 0.5rem 1rem; }
.btn-primary:hover { filter: brightness(1.15); box-shadow: 0 0 20px var(--accent-glow); }
.btn-record { background: var(--danger); color: white; }
.btn-record.recording { animation: pulse-red 1s infinite; }
.btn-export { background: var(--accent4); color: white; }
.btn-export:hover { filter: brightness(1.15); }

@keyframes pulse-red { 0%, 100% { box-shadow: 0 0 0 0 rgba(244,63,94,0.4); } 50% { box-shadow: 0 0 12px 4px rgba(244,63,94,0.3); } }

/* === Glass Panel === */
.glass-panel {
    background: var(--bg-panel);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    box-shadow: var(--shadow);
}
.panel-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 0.8rem; flex-wrap: wrap; gap: 0.5rem; }
.panel-header h2 { font-family: var(--font-display); font-size: 1rem; font-weight: 600; }
.panel-actions { display: flex; align-items: center; gap: 0.4rem; }
.select-sm { background: var(--bg-input); color: var(--text-primary); border: 1px solid var(--border); padding: 0.3rem 0.5rem; border-radius: var(--radius-xs); font-family: var(--font); font-size: 0.8rem; cursor: pointer; }
.select-sm:focus { outline: none; border-color: var(--accent); }

/* === Transport Bar === */
.transport-bar {
    display: flex; align-items: center; gap: 1.2rem; padding: 0.7rem 1rem;
    margin: 0.8rem 1rem; flex-wrap: wrap;
    background: linear-gradient(135deg, var(--bg-panel), rgba(139,92,246,0.05));
}
.transport-controls { display: flex; gap: 0.5rem; }
.transport-btn {
    width: 42px; height: 42px;
    border: 2px solid var(--border);
    border-radius: 50%;
    background: var(--bg-input);
    color: var(--text-primary);
    font-size: 1.1rem;
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: all 0.2s;
}
.transport-btn:hover { border-color: var(--accent); background: var(--accent-glow); }
.transport-btn.active { border-color: var(--accent); background: var(--accent); color: white; }
.tempo-control, .master-volume, .swing-control {
    display: flex; align-items: center; gap: 0.5rem;
}
.tempo-control label, .master-volume label, .swing-control label {
    color: var(--text-muted); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; white-space: nowrap;
}
.slider { -webkit-appearance: none; height: 4px; border-radius: 2px; background: var(--border); outline: none; width: 80px; cursor: pointer; }
.slider::-webkit-slider-thumb { -webkit-appearance: none; width: 14px; height: 14px; border-radius: 50%; background: var(--accent); cursor: pointer; box-shadow: 0 0 6px var(--accent-glow); }
.slider::-moz-range-thumb { width: 14px; height: 14px; border-radius: 50%; background: var(--accent); cursor: pointer; border: none; }
.tempo-num { width: 48px; background: var(--bg-input); border: 1px solid var(--border); color: var(--text-primary); text-align: center; padding: 0.25rem; border-radius: var(--radius-xs); font-family: var(--font-mono); font-size: 0.85rem; }
.tempo-num:focus { outline: none; border-color: var(--accent); }
.beat-display { font-family: var(--font-mono); font-size: 1.3rem; font-weight: 700; color: var(--accent); min-width: 40px; text-align: center; }
.time-display { font-family: var(--font-mono); font-size: 0.85rem; color: var(--text-muted); }
.transport-info { display: flex; align-items: center; gap: 0.8rem; margin-left: auto; }

/* === Studio Layout === */
.studio-layout { padding-bottom: 2rem; }
.workspace {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.8rem;
    padding: 0 1rem;
}

/* === Step Sequencer === */
.sequencer-grid { overflow-x: auto; }
.seq-row { display: flex; align-items: center; gap: 2px; margin-bottom: 2px; }
.seq-label {
    min-width: 70px; max-width: 70px;
    font-size: 0.7rem; color: var(--text-secondary);
    font-family: var(--font-mono);
    text-align: right; padding-right: 6px;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
    cursor: pointer;
}
.seq-label:hover { color: var(--accent); }
.seq-step {
    width: 28px; height: 28px; min-width: 28px;
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    background: var(--bg-input);
    cursor: pointer;
    transition: all 0.1s;
    position: relative;
}
.seq-step:hover { border-color: var(--accent); background: rgba(139,92,246,0.1); }
.seq-step.active { background: var(--step-active); border-color: var(--step-active); box-shadow: 0 0 8px var(--step-active-glow); }
.seq-step.current { box-shadow: inset 0 0 0 2px var(--accent5); }
.seq-step.beat-marker { border-bottom: 2px solid rgba(139,92,246,0.2); }
.seq-step:nth-child(4n+2) { margin-left: 2px; } /* visual grouping */
.seq-vol { width: 50px; margin-left: 4px; }

/* Drum rows color coding */
.seq-row[data-drum="kick"] .seq-step.active { background: var(--accent3); border-color: var(--accent3); box-shadow: 0 0 8px rgba(244,63,94,0.3); }
.seq-row[data-drum="snare"] .seq-step.active { background: var(--accent5); border-color: var(--accent5); box-shadow: 0 0 8px rgba(245,158,11,0.3); }
.seq-row[data-drum="hihat"] .seq-step.active { background: var(--accent2); border-color: var(--accent2); box-shadow: 0 0 8px rgba(6,182,212,0.3); }
.seq-row[data-drum="openhat"] .seq-step.active { background: #14b8a6; border-color: #14b8a6; box-shadow: 0 0 8px rgba(20,184,166,0.3); }
.seq-row[data-drum="clap"] .seq-step.active { background: var(--accent); border-color: var(--accent); }
.seq-row[data-drum="tom"] .seq-step.active { background: #a855f7; border-color: #a855f7; box-shadow: 0 0 8px rgba(168,85,247,0.3); }
.seq-row[data-drum="ride"] .seq-step.active { background: #64748b; border-color: #64748b; }
.seq-row[data-drum="crash"] .seq-step.active { background: #e11d48; border-color: #e11d48; box-shadow: 0 0 8px rgba(225,29,72,0.3); }

/* === Synth Panel === */
.synth-controls { display: flex; flex-direction: column; gap: 0.6rem; margin-bottom: 0.8rem; }
.control-group { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.control-group label { color: var(--text-muted); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; min-width: 60px; }
.wave-select { display: flex; gap: 4px; }
.wave-btn { padding: 0.35rem 0.6rem; border: 1px solid var(--border); border-radius: var(--radius-xs); background: var(--bg-input); color: var(--text-secondary); cursor: pointer; font-size: 0.9rem; transition: 0.2s; }
.wave-btn:hover { border-color: var(--accent); }
.wave-btn.active { background: var(--accent); color: white; border-color: var(--accent); box-shadow: 0 0 10px var(--accent-glow); }
.knob-row { display: flex; gap: 1rem; flex-wrap: wrap; }
.knob-group, .knob-group-sm { display: flex; flex-direction: column; align-items: center; gap: 0.2rem; }
.knob-group label, .knob-group-sm label { font-size: 0.65rem; color: var(--text-muted); text-transform: uppercase; }
.knob-slider { -webkit-appearance: none; height: 4px; border-radius: 2px; background: var(--border); outline: none; width: 70px; cursor: pointer; }
.knob-slider::-webkit-slider-thumb { -webkit-appearance: none; width: 12px; height: 12px; border-radius: 50%; background: var(--accent); cursor: pointer; }
.knob-slider::-moz-range-thumb { width: 12px; height: 12px; border-radius: 50%; background: var(--accent); cursor: pointer; border: none; }
.knob-val { font-family: var(--font-mono); font-size: 0.65rem; color: var(--accent); }

/* === Piano === */
.piano-container { overflow-x: auto; padding: 0.5rem 0; }
.piano-keyboard { display: flex; position: relative; min-width: 600px; height: 140px; user-select: none; }
.piano-key {
    position: relative;
    cursor: pointer;
    transition: all 0.08s ease;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 8px;
    font-size: 0.55rem;
    font-family: var(--font-mono);
}
.piano-key.white {
    width: 36px; height: 140px;
    background: var(--key-white);
    border: 1px solid #ccc;
    border-radius: 0 0 var(--radius-xs) var(--radius-xs);
    color: #888;
    z-index: 1;
}
.piano-key.white:hover { background: #e0e0ff; }
.piano-key.white.playing { background: var(--key-white-active); color: white; box-shadow: 0 0 15px var(--accent-glow); }
.piano-key.black {
    width: 24px; height: 90px;
    background: var(--key-black);
    border: 1px solid #000;
    border-radius: 0 0 3px 3px;
    color: #666;
    margin-left: -12px;
    margin-right: -12px;
    z-index: 2;
    box-shadow: 0 3px 6px rgba(0,0,0,0.4);
}
.piano-key.black:hover { background: #2a2a44; }
.piano-key.black.playing { background: var(--key-black-active); color: white; box-shadow: 0 0 15px rgba(6,182,212,0.4); }

/* === Effects === */
.effects-rack { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 0.6rem; }
.effect-unit { background: var(--bg-input); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 0.7rem; }
.effect-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.5rem; }
.effect-header span { font-size: 0.8rem; font-weight: 600; }
.effect-controls { display: flex; gap: 0.8rem; flex-wrap: wrap; }
.toggle-switch { position: relative; display: inline-block; width: 32px; height: 18px; }
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
    position: absolute; cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background: var(--border);
    border-radius: 18px;
    transition: 0.3s;
}
.toggle-slider::before {
    content: ''; position: absolute;
    height: 14px; width: 14px;
    left: 2px; bottom: 2px;
    background: white; border-radius: 50%;
    transition: 0.3s;
}
input:checked + .toggle-slider { background: var(--accent); }
input:checked + .toggle-slider::before { transform: translateX(14px); }

/* === Visualizer === */
.visualizer-panel canvas { width: 100%; height: 120px; border-radius: var(--radius-sm); background: var(--bg-input); }

/* === Footer === */
.footer {
    margin-top: 2rem;
    padding: 2rem 0 1rem;
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
}
.footer-inner { text-align: center; }
.footer-brand { margin-bottom: 1rem; }
.footer-brand span { font-family: var(--font-display); font-weight: 700; font-size: 1.1rem; }
.footer-brand p { color: var(--text-muted); font-size: 0.8rem; margin-top: 0.3rem; }
.footer-brand a { color: var(--accent); text-decoration: none; }
.footer-links-grid { display: flex; justify-content: center; gap: 3rem; margin: 1.5rem 0; flex-wrap: wrap; text-align: left; }
.footer-links-grid h4 { font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 0.5rem; text-transform: uppercase; letter-spacing: 0.05em; }
.footer-links-grid a { display: block; color: var(--text-muted); text-decoration: none; font-size: 0.8rem; padding: 0.15rem 0; transition: 0.2s; }
.footer-links-grid a:hover { color: var(--accent); }
.copyright { color: var(--text-muted); font-size: 0.75rem; margin-top: 1rem; }

/* === Modal === */
.modal-overlay { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.7); backdrop-filter: blur(4px); z-index: 1000; display: flex; align-items: center; justify-content: center; }
.modal { max-width: 450px; width: 90%; padding: 1.5rem; }
.modal h3 { margin-bottom: 1rem; font-family: var(--font-display); }
.shortcut-grid { display: grid; gap: 0.4rem; margin-bottom: 1rem; }
.shortcut-grid div { font-size: 0.85rem; color: var(--text-secondary); }
kbd { background: var(--bg-input); border: 1px solid var(--border); padding: 0.15rem 0.4rem; border-radius: 3px; font-family: var(--font-mono); font-size: 0.75rem; color: var(--accent); }

/* === Responsive === */
@media (max-width: 768px) {
    .transport-bar { gap: 0.6rem; padding: 0.5rem; }
    .slider { width: 60px; }
    .transport-info { margin-left: 0; }
    .knob-row { gap: 0.5rem; }
    .knob-slider { width: 55px; }
    .piano-key.white { width: 28px; height: 110px; }
    .piano-key.black { width: 20px; height: 70px; margin-left: -10px; margin-right: -10px; }
    .seq-step { width: 22px; height: 22px; min-width: 22px; }
    .seq-label { min-width: 55px; max-width: 55px; font-size: 0.6rem; }
    .nav-links { display: none; }
    .effects-rack { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
    .effects-rack { grid-template-columns: 1fr; }
    .piano-key.white { width: 24px; height: 90px; }
    .piano-key.black { width: 18px; height: 56px; margin-left: -9px; margin-right: -9px; }
}

/* === Scrollbar === */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }