:root {
    color-scheme: dark;
    font-family:
        Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
        "Segoe UI", sans-serif;
    background: #06080c;
    color: #f3f6fb;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(circle at top, #152138 0, #080b10 42%, #05070a 100%);
}

button,
select,
input {
    font: inherit;
}

.app-shell {
    width: min(1280px, calc(100% - 32px));
    margin: 0 auto;
    padding: 40px 0;
}

.topbar {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    align-items: flex-start;
    margin-bottom: 24px;
}

.eyebrow {
    margin: 0 0 8px;
    color: #7f97bb;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.16em;
}

h1 {
    margin: 0;
    max-width: 900px;
    font-size: clamp(2rem, 4vw, 4rem);
    line-height: 0.95;
    letter-spacing: -0.05em;
}

.subtitle {
    max-width: 760px;
    color: #aab5c5;
    font-size: 1rem;
}

.status {
    padding: 10px 14px;
    border: 1px solid #2b3544;
    border-radius: 999px;
    background: #101722;
    color: #c5cfdd;
    white-space: nowrap;
}

.status-live {
    border-color: #3d7353;
    color: #c6f5d1;
}

.status-error {
    border-color: #7c4040;
    color: #ffb7b7;
}

.toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    margin-bottom: 18px;
}

button {
    border: 0;
    border-radius: 12px;
    padding: 12px 18px;
    cursor: pointer;
    transition:
        transform 120ms ease,
        opacity 120ms ease;
}

button:hover:not(:disabled) {
    transform: translateY(-1px);
}

button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.primary-button {
    background: #f0f3f7;
    color: #0b1018;
    font-weight: 700;
}

.secondary-button {
    background: #17202d;
    color: #e7edf6;
    border: 1px solid #2c3746;
}

.control {
    min-height: 46px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 14px;
    border: 1px solid #2c3746;
    border-radius: 12px;
    background: rgba(15, 21, 31, 0.92);
    color: #aeb8c7;
}

.control.grow {
    min-width: 260px;
}

select {
    border: 0;
    background: transparent;
    color: #f3f6fb;
}

input[type="range"] {
    accent-color: #f3f6fb;
    flex: 1;
}

.visual-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 18px;
}

.visual-card,
.metrics-card,
.info-card {
    border: 1px solid #26303d;
    background: rgba(8, 13, 20, 0.9);
    box-shadow: 0 24px 90px rgba(0, 0, 0, 0.28);
}

.visual-card {
    position: relative;
    min-height: 600px;
    border-radius: 20px;
    overflow: hidden;
}

#webglCanvas {
    display: block;
    width: 100%;
    height: 600px;
}

.canvas-overlay {
    position: absolute;
    left: 18px;
    right: 18px;
    bottom: 14px;
    display: flex;
    justify-content: space-between;
    color: #66758a;
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    pointer-events: none;
}

.frequency-scale {
    position: absolute;
    left: 42px;
    right: 42px;
    bottom: 46px;
    height: 30px;
    color: #8090a8;
    font-size: 0.65rem;
    pointer-events: none;
}

.frequency-scale-line {
    position: absolute;
    top: 5px;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, #3970ad, #66d8c4, #a776ed);
    opacity: 0.75;
}

.frequency-tick {
    position: absolute;
    top: 0;
    transform: translateX(-50%);
    white-space: nowrap;
}

.frequency-tick::before {
    content: "";
    display: block;
    width: 1px;
    height: 8px;
    margin: 0 auto 4px;
    background: #73839b;
}

.frequency-tick-end {
    transform: translateX(-100%);
}

.frequency-tick[data-frequency="20"] {
    transform: translateX(0);
}

.metrics-card {
    border-radius: 20px;
    padding: 20px;
}

.metrics-card h2 {
    margin: 0 0 18px;
    font-size: 1rem;
    color: #dfe6ef;
}

.metric {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    padding: 12px 0;
    border-bottom: 1px solid #1d2632;
}

.metric:last-child {
    border-bottom: 0;
}

.metric span {
    color: #8390a4;
    font-size: 0.85rem;
}

.metric strong {
    font-variant-numeric: tabular-nums;
    color: #f5f7fa;
}

.info-card {
    margin-top: 16px;
    padding: 15px 18px;
    border-radius: 14px;
    color: #96a2b5;
    font-size: 0.9rem;
}

.info-card strong {
    color: #dfe6ef;
}

@media (max-width: 900px) {
    .topbar {
        flex-direction: column;
    }

    .visual-layout {
        grid-template-columns: 1fr;
    }

    .metrics-card {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 0 18px;
    }

    .metrics-card h2 {
        grid-column: 1 / -1;
    }
}

@media (max-width: 620px) {
    .app-shell {
        padding-top: 26px;
    }

    .metrics-card {
        display: block;
    }

    #webglCanvas,
    .visual-card {
        height: 420px;
        min-height: 420px;
    }

    .control,
    .control.grow {
        width: 100%;
    }
}