/* Append to styles.css or replace */
:root {
    --bg-dark: #0b0f19;
    --bg-panel: #161e31;
    --bg-panel-hover: #1f2940;
    --accent: #38bdf8;
    --accent-glow: rgba(56, 189, 248, 0.4);
    --accent-secondary: #c084fc;
    --accent-green: #10b981;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'Fira Code', 'Courier New', monospace;
    --doc-bg: #f8fafc;
    --doc-text: #334155;
    --doc-heading: #0f172a;
    --doc-border: #e2e8f0;
}

* { box-sizing: border-box; }
body { margin: 0; padding: 0; font-family: var(--font-sans); line-height: 1.6; scroll-behavior: smooth; overflow-x: hidden; }
body.experience-mode { background-color: var(--bg-dark); color: var(--text-main); }

/* Audio Overlay & Nav */
.audio-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(11, 15, 25, 0.95); backdrop-filter: blur(15px); z-index: 9999; display: flex; justify-content: center; align-items: center; transition: opacity 0.5s ease; }
.audio-overlay.hidden { opacity: 0; pointer-events: none; }
.overlay-content { text-align: center; max-width: 600px; padding: 2rem; }
.overlay-content h2 { font-size: 2.5rem; margin-bottom: 1rem; color: var(--accent); }
.exp-nav { position: fixed; top: 0; width: 100%; background: rgba(11, 15, 25, 0.85); backdrop-filter: blur(10px); z-index: 1000; border-bottom: 1px solid rgba(255,255,255,0.05); display: flex; justify-content: space-between; align-items: center; padding: 1rem 4rem; }
.exp-nav .logo { font-weight: 800; font-size: 1.2rem; background: linear-gradient(90deg, var(--accent), var(--accent-secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.exp-nav .nav-links { display: flex; gap: 2rem; align-items: center; }
.exp-nav .nav-links a { color: var(--text-muted); text-decoration: none; font-weight: 500; transition: color 0.3s; font-size: 0.9rem; }
.exp-nav .nav-links a:hover, .exp-nav .nav-links a.active { color: var(--accent); }
.btn-doc { background: rgba(255,255,255,0.1); padding: 0.5rem 1rem; border-radius: 4px; border: 1px solid rgba(255,255,255,0.2); }

/* Hero */
.hero-section { position: relative; height: 100vh; display: flex; flex-direction: column; justify-content: center; align-items: center; text-align: center; padding: 0 2rem; overflow: hidden; }
#particles-canvas { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 1; pointer-events: none; }
.visualizer { position: absolute; bottom: 0; left: 0; width: 100%; height: 300px; z-index: 1; pointer-events: none; opacity: 0.4; mix-blend-mode: screen; }
.hero-content { position: relative; z-index: 2; max-width: 900px; }
.hero-content h1 { font-size: 4rem; line-height: 1.1; margin-bottom: 1.5rem; text-shadow: 0 0 40px rgba(56, 189, 248, 0.3); }
.hero-content p { font-size: 1.4rem; color: var(--text-muted); font-weight: 300; }
.scroll-indicator { position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%); animation: bounce 2s infinite; color: var(--accent); text-decoration: none; font-size: 2rem; z-index: 10; }
@keyframes bounce { 0%, 20%, 50%, 80%, 100% { transform: translateY(0) translateX(-50%); } 40% { transform: translateY(-20px) translateX(-50%); } 60% { transform: translateY(-10px) translateX(-50%); } }

/* Sections */
.section { padding: 8rem 4rem; max-width: 1400px; margin: 0 auto; }
.section-title { font-size: 2.5rem; margin-bottom: 1rem; color: #fff; display: flex; align-items: center; gap: 1rem; }
.section-title::before { content: ''; display: block; width: 40px; height: 4px; background: var(--accent); border-radius: 2px; }
.section-subtitle { color: var(--text-muted); font-size: 1.2rem; margin-bottom: 4rem; max-width: 800px; }
.reveal-on-scroll { opacity: 0; transform: translateY(40px); transition: opacity 0.8s ease, transform 0.8s ease; }
.reveal-on-scroll.revealed { opacity: 1; transform: translateY(0); }
.split-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }

/* Interactive Theory & Buttons */
.interactive-card { background: var(--bg-panel); border: 1px solid rgba(255,255,255,0.05); border-radius: 12px; padding: 2.5rem; transition: transform 0.3s, box-shadow 0.3s; }
.interactive-card:hover { transform: translateY(-5px); box-shadow: 0 10px 40px rgba(0,0,0,0.4); border-color: rgba(56, 189, 248, 0.3); }
.small-text { font-size: 0.95rem; color: var(--text-muted); margin-bottom: 1.5rem; min-height: 50px;}
.chord-controls { display: flex; gap: 1rem; flex-wrap: wrap; }
.play-btn { background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.2); color: #fff; padding: 0.8rem 1.5rem; border-radius: 50px; font-family: var(--font-sans); font-weight: 600; cursor: pointer; transition: all 0.3s; display: inline-flex; align-items: center; gap: 0.5rem; }
.play-btn::before { content: '▶'; font-size: 0.8rem; color: var(--accent); }
.play-btn:hover { background: rgba(255,255,255,0.2); border-color: var(--accent); }
.play-btn.highlight { background: rgba(56, 189, 248, 0.15); border-color: var(--accent); color: var(--accent); }
.play-btn.highlight:hover { background: var(--accent); color: #000; }
.play-btn.highlight:hover::before { color: #000; }
.play-btn.large { font-size: 1.2rem; padding: 1rem 3rem; background: var(--accent); color: #000; border: none; }
.play-btn.large::before { display: none; }
.play-btn.large:hover { box-shadow: 0 0 30px var(--accent-glow); transform: scale(1.05); }

/* Interactive Mixer */
.interactive-mixer { display: flex; justify-content: space-between; align-items: center; background: #111827; border: 1px solid rgba(56,189,248,0.3); border-radius: 12px; padding: 2rem; box-shadow: inset 0 0 20px rgba(0,0,0,0.5); }
.mixer-info { max-width: 60%; }
.mixer-info h3 { color: var(--accent-secondary); margin-top: 0; }
.mixer-controls { display: flex; flex-direction: column; align-items: center; gap: 1rem; background: #1f2937; padding: 1.5rem; border-radius: 8px; }
.status-label { font-family: var(--font-mono); font-size: 0.85rem; color: #ef4444; font-weight: bold; text-transform: uppercase; letter-spacing: 1px;}
.status-label.filtered { color: var(--accent-green); }
.toggle-switch { position: relative; display: inline-block; width: 60px; height: 34px; }
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: #ef4444; transition: .4s; border-radius: 34px; }
.slider:before { position: absolute; content: ""; height: 26px; width: 26px; left: 4px; bottom: 4px; background-color: white; transition: .4s; border-radius: 50%; }
input:checked + .slider { background-color: var(--accent-green); }
input:checked + .slider:before { transform: translateX(26px); }

/* Playable Piano */
.piano-wrapper { background: #111827; padding: 3rem; border-radius: 12px; border: 1px solid #334155; display: flex; justify-content: center; box-shadow: 0 20px 40px rgba(0,0,0,0.5); }
.piano-container { position: relative; display: flex; width: 100%; max-width: 800px; height: 250px; background: #000; border-radius: 8px; border: 4px solid #1e293b; padding: 2px; }
.piano-key { cursor: pointer; border-radius: 0 0 6px 6px; box-sizing: border-box; position: relative; user-select: none; transition: background 0.1s; }
.piano-key .key-label { position: absolute; bottom: 10px; width: 100%; text-align: center; font-family: var(--font-mono); font-size: 0.9rem; font-weight: bold; pointer-events: none; }
.piano-key.white { flex: 1; background: #f8fafc; border: 1px solid #cbd5e1; z-index: 1; height: 100%; }
.piano-key.white .key-label { color: #94a3b8; }
.piano-key.white:hover { background: #e2e8f0; }
.piano-key.white.active { background: #bae6fd; box-shadow: inset 0 0 20px rgba(56, 189, 248, 0.5); }
.piano-key.white.active .key-label { color: var(--accent); }
.piano-key.black { position: absolute; width: calc(100% / 8 * 0.6); height: 60%; background: #0f172a; border: 1px solid #000; z-index: 2; border-radius: 0 0 4px 4px; box-shadow: inset 0 -5px 10px rgba(255,255,255,0.1); }
.piano-key.black .key-label { color: #475569; font-size: 0.7rem; bottom: 15px; }
.piano-key.black:hover { background: #1e293b; }
.piano-key.black.active { background: var(--accent); box-shadow: 0 0 20px var(--accent-glow); }
.piano-key.black.active .key-label { color: #fff; }

/* Interactive Web DAW & Controls */
.daw-interface { background: #0f1219; border: 1px solid #334155; border-radius: 12px; overflow: hidden; font-family: var(--font-mono); box-shadow: 0 20px 50px rgba(0,0,0,0.5); }
.daw-header { background: #1e293b; padding: 1rem 1.5rem; display: flex; align-items: center; border-bottom: 1px solid #0f172a; }
.daw-dots { display: flex; gap: 8px; margin-right: 1.5rem; }
.daw-dot { width: 12px; height: 12px; border-radius: 50%; }
.daw-dot.red { background: #ef4444; } .daw-dot.yellow { background: #f59e0b; } .daw-dot.green { background: #10b981; }
.daw-title { color: #94a3b8; font-size: 0.9rem; flex-grow: 1; }
.daw-transport { display: flex; gap: 1rem; align-items: center; }
.transport-btn { background: #334155; color: #fff; border: none; padding: 0.5rem 1rem; border-radius: 4px; font-family: var(--font-mono); font-weight: bold; cursor: pointer; transition: background 0.2s; }
.transport-btn:hover { background: #475569; }
.transport-btn.playing { background: var(--accent-green); color: #000; box-shadow: 0 0 15px rgba(16, 185, 129, 0.4); }
.bpm-display { color: var(--accent); background: rgba(56,189,248,0.1); padding: 0.3rem 0.6rem; border-radius: 4px; }

/* DAW Presets (NEW) */
.daw-presets { padding: 1rem 1.5rem; background: #0b0f19; border-bottom: 1px solid #1e293b; display: flex; gap: 1rem; align-items: center; flex-wrap: wrap;}
.daw-presets strong { color: #64748b; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 1px;}
.preset-btn { background: #1e293b; color: #94a3b8; border: 1px solid #334155; padding: 0.5rem 1rem; border-radius: 4px; font-family: var(--font-mono); font-size: 0.8rem; cursor: pointer; transition: all 0.2s; }
.preset-btn:hover { background: #334155; color: #fff; }
.preset-btn.active { background: rgba(56, 189, 248, 0.15); color: var(--accent); border-color: var(--accent); }

/* DAW Control Bar */
.daw-control-bar { background: #0f172a; padding: 1.5rem; border-bottom: 1px solid #1e293b; display: flex; gap: 3rem; align-items: center; }
.control-group { display: flex; flex-direction: column; gap: 0.5rem; flex: 1; }
.control-group label { color: #94a3b8; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 1px; }
.control-group label span { color: var(--text-main); font-weight: bold; }
input[type=range] { -webkit-appearance: none; width: 100%; background: transparent; }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; height: 16px; width: 16px; border-radius: 50%; background: var(--accent); cursor: pointer; margin-top: -6px; box-shadow: 0 0 10px var(--accent-glow); }
input[type=range]::-webkit-slider-runnable-track { width: 100%; height: 4px; cursor: pointer; background: #334155; border-radius: 2px; }
.daw-select { background: #1e293b; color: #f1f5f9; border: 1px solid #334155; padding: 0.5rem; border-radius: 4px; font-family: var(--font-mono); outline: none; cursor: pointer; }

/* DAW Tracks */
.daw-body { display: grid; grid-template-columns: 250px 1fr; }
.daw-sidebar { background: #0f172a; padding: 1.5rem; border-right: 1px solid #1e293b; }
.daw-sidebar ul { list-style: none; padding: 0; margin: 0; }
.daw-sidebar li { padding: 1.25rem 0; color: #64748b; border-bottom: 1px solid #1e293b; font-size: 0.85rem; }
.daw-sidebar li strong { color: #f1f5f9; display: block; margin-bottom: 0.3rem; }
.daw-main { padding: 1.5rem; background: #0b0f19; position: relative; }
.daw-track { display: flex; height: 60px; margin-bottom: 1rem; background: #1e293b; border-radius: 6px; overflow: hidden; border: 1px solid #334155; }
.daw-track-controls { width: 150px; background: #0f172a; border-right: 1px solid #334155; display: flex; flex-direction: column; justify-content: center; padding: 0 1rem; }
.daw-track-controls h5 { margin: 0; color: #cbd5e1; font-size: 0.75rem; text-transform: uppercase; margin-top: 0.3rem;}
.mute-btn { background: var(--accent-green); color: #fff; border: none; border-radius: 3px; padding: 0.2rem; font-size: 0.7rem; font-weight: bold; cursor: pointer; font-family: var(--font-mono); transition: 0.2s;}
.mute-btn:not(.active) { background: #ef4444; opacity: 0.6; }
.daw-track-wave { flex-grow: 1; position: relative; background: repeating-linear-gradient(90deg, transparent, transparent 19px, #1e293b 19px, #1e293b 20px), #0f172a; }
.live-meter { height: 100%; width: 0%; background: rgba(56, 189, 248, 0.3); box-shadow: 0 0 10px var(--accent-glow); transition: width 0.1s ease-out; }
.daw-track[data-track="drums"] .live-meter { background: rgba(239, 68, 68, 0.4); }
.daw-track[data-track="bass"] .live-meter { background: rgba(245, 158, 11, 0.4); }
.daw-track[data-track="arp"] .live-meter { background: rgba(16, 185, 129, 0.4); }
.playhead { position: absolute; top: 1.5rem; bottom: 1.5rem; left: 165px; width: 2px; background: rgba(255,255,255,0.8); box-shadow: 0 0 10px #fff; z-index: 10; display: none; }

footer { text-align: center; padding: 4rem; border-top: 1px solid rgba(255,255,255,0.05); color: var(--text-muted); margin-top: 4rem; }

/* Document Mode */
body.document-mode { background-color: var(--doc-bg); color: var(--doc-text); }
.doc-nav { background: #fff; padding: 1rem 4rem; box-shadow: 0 2px 10px rgba(0,0,0,0.05); display: flex; justify-content: space-between; align-items: center; position: sticky; top: 0; z-index: 100; }
.doc-nav a { color: var(--doc-text); text-decoration: none; font-weight: 500; }
.doc-nav a:hover { color: var(--accent); }
.reader-container { max-width: 800px; margin: 4rem auto; background: #fff; padding: 5rem; border-radius: 4px; box-shadow: 0 4px 20px rgba(0,0,0,0.03); border: 1px solid var(--doc-border); }
.reader-container h1, .reader-container h2, .reader-container h3 { color: var(--doc-heading); }
.reader-container h1 { font-size: 2.5rem; line-height: 1.3; text-align: center; margin-bottom: 2rem; }
.reader-container h2 { font-size: 1.8rem; margin-top: 3.5rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--doc-border); }
.reader-container p, .reader-container li { font-size: 1.1rem; color: #475569; }
.reader-container table { width: 100%; border-collapse: collapse; margin: 2rem 0; }
.reader-container th, .reader-container td { padding: 1rem; border: 1px solid var(--doc-border); text-align: left; }
.reader-container th { background: #f8fafc; }
.works-cited { margin-top: 5rem; padding-top: 2rem; border-top: 2px solid var(--doc-border); font-size: 0.9rem; }