/* ============================================================
   Schneider Visual System — 12-col grid
   Modular scale: 1.333 (perfect fourth)
   Fibonacci spacing: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55
   ============================================================ */

:root {
    /* Palette — 6 colors, defined roles */
    --color-void: #0a0a0f;
    --color-surface: #12121a;
    --color-border: #22222e;
    --color-text: #e8e8ed;
    --color-muted: #6b6b80;
    --color-accent: #6366f1;
    --color-accent-glow: rgba(99, 102, 241, 0.25);

    /* Fibonacci spacing tokens (px) */
    --space-1: 1px;
    --space-2: 2px;
    --space-3: 3px;
    --space-5: 5px;
    --space-8: 8px;
    --space-13: 13px;
    --space-21: 21px;
    --space-34: 34px;
    --space-55: 55px;

    /* 12-col grid */
    --grid-columns: 12;
    --grid-gutter: 16px;

    /* Typographic scale — perfect fourth (1.333) */
    --type-xs: 0.75rem;
    --type-sm: 1rem;
    --type-base: 1.333rem;
    --type-lg: 1.777rem;
    --type-xl: 2.369rem;
    --type-xxl: 3.158rem;

    /* Timing — 4-phase cycle */
    --easing-out-expo: cubic-bezier(0.19, 1.00, 0.22, 1.00);
    --easing-in-out: cubic-bezier(0.45, 0.05, 0.55, 0.95);
    --duration-fast: 0.12s;
    --duration-med: 0.4s;
    --duration-slow: 0.8s;

    /* Oscillator phase */
    --phase: 0;
    --wave-amplitude: 40px;
    --wave-color: var(--color-accent);
}

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

body {
    background-color: var(--color-void);
    color: var(--color-text);
    font-family: -apple-system, 'Helvetica Neue', Arial, sans-serif;
    font-size: var(--type-sm);
    line-height: 1.4;
    height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

.frame {
    display: grid;
    grid-template-rows: auto 1fr auto;
    height: 100vh;
    width: 100vw;
}

/* Header — 12-col layout, top-aligned */
.header {
    grid-row: 1;
    padding: var(--space-8) var(--space-13);
    border-bottom: var(--space-1) solid var(--color-border);
}

.header-inner {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--grid-gutter);
    align-items: center;
}

.brand {
    grid-column: 1 / 4;
    font-weight: 900;
    font-size: var(--type-base);
    letter-spacing: -0.02em;
    color: var(--color-accent);
}

.title {
    grid-column: 4 / 8;
    font-weight: 700;
    font-size: var(--type-sm);
    text-transform: lowercase;
    letter-spacing: 0.08em;
    color: var(--color-text);
}

.subtitle {
    grid-column: 8 / 13;
    font-size: var(--type-xs);
    color: var(--color-muted);
    text-align: right;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

/* Canvas area — fills remaining space */
.canvas-area {
    grid-row: 2;
    position: relative;
    overflow: hidden;
    background: var(--color-surface);
}

#waveform {
    display: block;
    width: 100%;
    height: 100%;
}

/* Overlay — phase indicator + grid lines */
.overlay {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 2;
}

.phase-indicator {
    position: absolute;
    top: var(--space-13);
    left: var(--space-13);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    pointer-events: none;
}

.phase-label {
    font-size: var(--type-xs);
    color: var(--color-muted);
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.phase-value {
    font-size: var(--type-xl);
    font-weight: 900;
    color: var(--color-accent);
    font-variant-numeric: tabular-nums;
    transition: color var(--duration-fast) var(--easing-out-expo);
}

.phase-value.shift {
    color: #f0f0f5;
    text-shadow: 0 0 20px var(--color-accent-glow);
}

/* Grid overlay — 12 vertical columns */
.grid-overlay {
    position: absolute;
    inset: 0;
    background-image:
        repeating-linear-gradient(
            to right,
            transparent,
            transparent calc(8.333% - 1px),
            rgba(255,255,255,0.04) calc(8.333% - 1px),
            rgba(255,255,255,0.04) calc(8.333%)
        );
    transition: transform var(--duration-slow) var(--easing-out-expo),
                opacity var(--duration-slow) var(--easing-out-expo);
}

.grid-overlay.phase-shift {
    transform: scaleX(0.533);
    opacity: 0.3;
}

/* Controls — bottom, 12-col grid */
.controls {
    grid-row: 3;
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--grid-gutter);
    padding: var(--space-13);
    align-items: center;
    border-top: var(--space-1) solid var(--color-border);
    background: var(--color-void);
}

.action-btn {
    grid-column: 3 / 11;
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    justify-items: center;
    gap: var(--space-8);
    padding: var(--space-13) var(--space-34);
    background: var(--color-accent);
    color: #fff;
    border: none;
    border-radius: var(--space-3);
    cursor: pointer;
    font-family: inherit;
    font-size: var(--type-sm);
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    transition: background var(--duration-fast) var(--easing-out-expo),
                transform var(--duration-fast) var(--easing-out-expo);
}

.action-btn:hover {
    background: #7c7ff7;
    transform: translateY(calc(var(--space-1) * -1));
}

.action-btn:active {
    transform: scale(0.97);
}

.action-btn:disabled {
    opacity: 0.35;
    cursor: default;
    transform: none;
}

.btn-indicator {
    width: var(--space-13);
    height: var(--space-13);
    border-radius: 50%;
    border: var(--space-2) solid rgba(255,255,255,0.5);
    transition: border-color var(--duration-fast),
                background var(--duration-fast),
                box-shadow var(--duration-fast);
}

.btn-indicator.active {
    border-color: #fff;
    background: #fff;
    box-shadow: 0 0 12px rgba(99, 102, 241, 0.6);
}

.mute-btn {
    grid-column: 11 / 13;
    justify-self: center;
    background: none;
    border: var(--space-1) solid var(--color-border);
    border-radius: var(--space-3);
    padding: var(--space-5) var(--space-8);
    font-size: var(--type-sm);
    cursor: pointer;
    color: var(--color-muted);
    transition: border-color var(--duration-fast),
                color var(--duration-fast);
}

.mute-btn:hover {
    border-color: var(--color-muted);
    color: var(--color-text);
}

/* Phase shift keyframes — used for kick envelope */
@keyframes kickPulse {
    0%   { box-shadow: none; }
    30%  { box-shadow: 0 0 60px 20px var(--color-accent-glow); }
    100% { box-shadow: none; }
}

.canvas-area.kick {
    animation: kickPulse var(--duration-slow) var(--easing-out-expo) forwards;
}

/* Reset flash */
@keyframes resetFlash {
    0%   { opacity: 1; }
    50%  { opacity: 0.08; }
    100% { opacity: 1; }
}

.body-reset {
    animation: resetFlash 0.6s var(--easing-in-out);
}

/* Mobile — collapses to 4-col base, maintains proportion */
@media (max-width: 600px) {
    :root {
        --space-13: 10px;
        --space-34: 24px;
    }

    .header-inner {
        grid-template-columns: 1fr 1fr 1fr;
    }

    .brand {
        grid-column: 1;
    }

    .title {
        grid-column: 2;
        text-align: center;
    }

    .subtitle {
        grid-column: 3;
        text-align: right;
    }

    .controls {
        grid-template-columns: 1fr 1fr;
        padding: var(--space-8);
    }

    .action-btn {
        grid-column: 1 / 2;
        padding: var(--space-8) var(--space-13);
    }

    .mute-btn {
        grid-column: 2;
        justify-self: end;
    }
}