@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&display=swap');

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

:root {
    --amber: #D4A574;
    --amber-light: #F5C87A;
    --amber-glow: #FFD700;
    --amber-deep: #B8860B;
    --teal: #2D9596;
    --teal-dim: rgba(45, 149, 150, 0.15);
    --black: #000000;
    --charcoal: #0A0A0A;
}

body {
    background: var(--black);
    color: var(--amber);
    font-family: 'Space Mono', monospace;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

/* Grid background */
.grid-bg {
    position: fixed;
    inset: 0;
    background:
        linear-gradient(var(--teal-dim) 1px, transparent 1px),
        linear-gradient(90deg, var(--teal-dim) 1px, transparent 1px);
    background-size: 40px 40px;
    opacity: 0.3;
    pointer-events: none;
}

/* Vignette */
.vignette {
    position: fixed;
    inset: 0;
    background: radial-gradient(circle at center, transparent 0%, var(--black) 70%);
    pointer-events: none;
}

/* Main container */
.signal-container {
    position: relative;
    width: 100%;
    max-width: 800px;
    padding: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 10;
}

/* Corner brackets */
.corner {
    position: fixed;
    width: 60px;
    height: 60px;
    border: 1px solid var(--teal);
    opacity: 0.4;
}

.corner.tl { top: 30px; left: 30px; border-right: none; border-bottom: none; }
.corner.tr { top: 30px; right: 30px; border-left: none; border-bottom: none; }
.corner.bl { bottom: 30px; left: 30px; border-right: none; border-top: none; }
.corner.br { bottom: 30px; right: 30px; border-left: none; border-top: none; }

/* Top label */
.top-label {
    font-size: 10px;
    letter-spacing: 0.4em;
    color: var(--teal);
    text-transform: uppercase;
    margin-bottom: 60px;
    opacity: 0.8;
}

/* Waveform visualizer */
.waveform {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 3px;
    height: 200px;
    margin-bottom: 40px;
}

.waveform-bar {
    width: 5px;
    background: linear-gradient(to top, var(--amber-deep), var(--amber), var(--amber-glow));
    border-radius: 2px;
    transition: height 0.05s ease-out;
    box-shadow: 0 0 10px rgba(212, 165, 116, 0.3);
}

.waveform-bar.active {
    box-shadow: 0 0 20px rgba(255, 215, 0, 0.6);
}

/* Title */
.title {
    font-size: 72px;
    font-weight: 700;
    letter-spacing: 0.2em;
    color: var(--amber);
    text-shadow:
        0 0 40px rgba(212, 165, 116, 0.5),
        0 0 80px rgba(212, 165, 116, 0.3);
    margin-bottom: 20px;
}

/* Subtitle */
.subtitle {
    font-size: 12px;
    letter-spacing: 0.4em;
    color: var(--teal);
    text-transform: uppercase;
    margin-bottom: 60px;
}

/* BPM display */
.bpm {
    font-size: 20px;
    letter-spacing: 0.3em;
    color: var(--amber);
    opacity: 0.5;
    margin-bottom: 10px;
}

/* Footer */
.footer {
    font-size: 9px;
    letter-spacing: 0.3em;
    color: rgba(212, 165, 116, 0.3);
    text-transform: uppercase;
}

/* Start button */
.start-button {
    font-family: 'Space Mono', monospace;
    font-size: 16px;
    letter-spacing: 0.2em;
    padding: 20px 40px;
    background: transparent;
    border: 1px solid var(--amber);
    color: var(--amber);
    cursor: pointer;
    transition: all 0.3s ease;
}

.start-button:hover {
    background: var(--amber);
    color: var(--black);
    box-shadow: 0 0 30px rgba(212, 165, 116, 0.5);
}

/* Loop indicator */
.loop-indicator {
    position: fixed;
    top: 30px;
    right: 100px;
    font-size: 10px;
    letter-spacing: 0.2em;
    color: var(--teal);
    display: flex;
    align-items: center;
    gap: 8px;
}

.loop-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--teal);
    animation: pulse-dot 1s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

/* Controls */
.controls {
    position: fixed;
    bottom: 30px;
    display: flex;
    gap: 20px;
}

.control-btn {
    font-family: 'Space Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.15em;
    padding: 10px 20px;
    background: transparent;
    border: 1px solid rgba(212, 165, 116, 0.3);
    color: var(--amber);
    cursor: pointer;
    transition: all 0.2s ease;
    opacity: 0.6;
}

.control-btn:hover {
    border-color: var(--amber);
    opacity: 1;
}

.control-btn.active {
    border-color: var(--teal);
    color: var(--teal);
}

/* Responsive */
@media (max-width: 600px) {
    .title {
        font-size: 36px;
    }

    .waveform {
        height: 120px;
    }

    .waveform-bar {
        width: 3px;
    }
}