:root {
    --bg-color: #050510;
    --text-primary: #ffffff;
    --text-secondary: #a0a0ff;
    --accent-color: #00f0ff;
    --card-bg: rgba(20, 20, 40, 0.6);
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: 'Outfit', sans-serif;
    overflow: hidden; /* Prevent scrolling, canvas is full screen */
    height: 100vh;
    width: 100vw;
}

canvas#visualizer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    pointer-events: none; /* Let clicks pass through to canvas if needed, but here mostly for UI */
}

/* Re-enable pointer events for UI elements */
.header, .controls-container, .center-instruction {
    pointer-events: auto;
}

#bpm-display {
    position: fixed;
    top: 2rem;
    left: 2rem;
    font-family: 'Outfit', monospace;
    font-size: 0.9rem;
    color: var(--text-secondary);
    opacity: 0.4;
    transition: opacity 0.5s ease;
    z-index: 20; /* Above header if needed, but header fades out */
    pointer-events: none;
    letter-spacing: 1px;
}
#bpm-display.hidden {
    opacity: 0;
}

.header {
    padding: 2rem;
    display: flex;
    justify-content: center; /* Center Title */
    align-items: center;
    background: linear-gradient(to bottom, rgba(5,5,16,0.8), transparent);
    transition: opacity 0.5s ease, transform 0.5s ease;
    width: 100%;
    position: relative;
    z-index: 10;
}

.header.hidden {
    opacity: 0;
    transform: translateY(-20px);
    pointer-events: none; /* Pass through clicks when hidden */
}

.header.hidden:hover {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
    background: linear-gradient(to bottom, rgba(5,5,16,0.9), transparent);
}

h1 {
    font-weight: 200;
    letter-spacing: 2px;
    font-size: 1.5rem;
    color: var(--text-secondary);
}

.center-instruction {
    position: absolute;
    top: 40%; 
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    pointer-events: none; /* Don't block view */
    text-shadow: 0 0 20px rgba(0,0,0,0.8);
}

#phase-text {
    font-size: 4rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    letter-spacing: 4px;
    opacity: 0.9;
}

#timer-text {
    font-size: 1.5rem;
    color: var(--text-secondary);
    font-family: monospace;
    transition: font-size 0.3s ease, color 0.3s ease;
}

#timer-text.timer-large {
    font-size: 6rem;
    color: var(--text-primary);
    text-shadow: 0 0 20px rgba(0, 240, 255, 0.5);
    font-weight: 700;
}

.controls-container {
    padding: 2rem;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    background: linear-gradient(to top, rgba(5,5,16,0.95), transparent);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
    padding-bottom: 3rem;
    transition: opacity 0.5s ease, transform 0.5s ease;
}

/* Conflicting hidden rule removed - see below for correct logic */


/* Ensure Start Button stays visible/accessible or move it out */
/* Actually, we want the button to remain visible but maybe move? */
/* Current logic: Button is INSIDE controls-container. If we hide container, we hide button. */
/* We need to move playback-controls OUT of controls-container or exclude it. */
/* Better fix: Make controls-container only contain mode selector. */

/* .playback-controls maintained for structure */


.controls-container.hidden {
    background: transparent; /* Remove heavy gradient */
    transition: background 0.3s ease;
}

/* Hidden State for Active Mode */
.controls-container.hidden {
    background: transparent;
    pointer-events: none; /* Let clicks pass mostly */
}

/* Make sure the container doesn't block clicks, but the button inside does */
.controls-container.hidden > * {
    pointer-events: none;
}
.controls-container.hidden .playback-controls {
    pointer-events: auto; /* Re-enable button */
}

.controls-container.hidden .mode-selector {
    opacity: 0;
    pointer-events: none; 
    max-height: 0;
    margin: 0;
    overflow: hidden;
    /* No hover reveal - distractions removed */
}

.controls-container.hidden #mode-details {
    opacity: 0;
    max-height: 0;
    margin: 0;
    overflow: hidden;
    transition: all 0.5s ease;
}

.primary-btn.active-practice {
    transform: scale(0.8);
    opacity: 0.3; /* Very subtle */
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: rgba(255, 255, 255, 0.7);
    box-shadow: none;
    transition: all 0.5s ease;
    padding: 0.8rem 2rem; /* Smaller */
    font-size: 0.9rem;
    letter-spacing: 1px;
}

.primary-btn.active-practice:hover {
    opacity: 1;
    transform: scale(1);
    background: rgba(255, 74, 74, 0.2);
    border-color: #ff4a4a;
    color: #ff4a4a;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
}

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

.mode-btn {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1rem 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 130px; /* Slightly wider */
    flex: 1 1 130px; /* Allow flexible growth */
    max-width: 200px; /* Prevent too wide */
}

/* Restore hover and active states */
.mode-btn:hover {
    background: rgba(40, 40, 80, 0.8);
    transform: translateY(-2px);
}

.mode-btn.active {
    border-color: var(--accent-color);
    color: var(--text-primary);
    box-shadow: 0 0 15px rgba(0, 240, 255, 0.2);
    background: rgba(20, 40, 60, 0.8); /* Slightly brighter bg for active */
}

.mode-btn .label {
    font-size: 1.1rem; /* Larger text since icons are gone */
    font-weight: 500;
    margin-bottom: 0.2rem;
}

.mode-btn .sub {
    font-size: 0.75rem;
    opacity: 0.7;
    margin-top: 0.2rem;
}

.primary-btn {
    background: var(--text-primary);
    color: var(--bg-color);
    border: none;
    padding: 1rem 3rem;
    border-radius: 30px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
}

.primary-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 0 30px rgba(255, 255, 255, 0.4);
}

.primary-btn.stop {
    background: #ff4a4a;
    color: white;
    box-shadow: 0 0 20px rgba(255, 74, 74, 0.3);
}

/* Specific helper for custom controls toggle */
#custom-controls.hidden {
    display: none !important;
}

@media (max-width: 600px) {
    .mode-selector {
        gap: 0.5rem;
    }
    .mode-btn {
        padding: 0.8rem;
        min-width: 90px;
    }
    #phase-text {
        font-size: 3rem;
    }
}