/* ==========================================================================
   Echo — bat sound listener
   Dark, focused, spectrogram-first UI.
   ========================================================================== */

:root {
    --bg: #07090f;
    --bg-2: #0d111b;
    --surface: #12172380;
    --surface-solid: #131824;
    --border: #232a3a;
    --text: #e9edf6;
    --text-soft: #9aa4ba;
    --text-faint: #626c82;
    --accent: #2dd4bf;
    --accent-2: #a78bfa;
    --hot: #fb7185;
    --radius: 16px;
    --radius-sm: 10px;
    --font: 'Space Grotesk', system-ui, -apple-system, sans-serif;
    --mono: 'JetBrains Mono', ui-monospace, Menlo, monospace;
}

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

body {
    font-family: var(--font);
    color: var(--text);
    background:
        radial-gradient(900px 500px at 15% -5%, rgba(45, 212, 191, 0.12), transparent 60%),
        radial-gradient(800px 600px at 90% 0%, rgba(167, 139, 250, 0.12), transparent 55%),
        var(--bg);
    background-attachment: fixed;
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.wrap {
    width: min(100% - 2rem, 920px);
    margin: 0 auto;
    padding: clamp(1.5rem, 4vw, 3rem) 0 3rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* ---- Hero ---- */
.hero {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .5rem;
}

.hero-mark {
    font-size: 3rem;
    line-height: 1;
    filter: drop-shadow(0 8px 24px rgba(45, 212, 191, .3));
    animation: hover 4s ease-in-out infinite;
}

@keyframes hover {

    0%,
    100% {
        transform: translateY(0) rotate(-3deg);
    }

    50% {
        transform: translateY(-8px) rotate(3deg);
    }
}

.hero h1 {
    font-size: clamp(2rem, 6vw, 2.8rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    background: linear-gradient(120deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.lede {
    max-width: 52ch;
    color: var(--text-soft);
    font-size: 1rem;
}

.lede strong {
    color: var(--text);
    font-weight: 600;
}

/* ---- Spectrogram stage ---- */
.stage {
    position: relative;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    background: #04060a;
    box-shadow: 0 20px 50px rgba(0, 0, 0, .45), inset 0 0 60px rgba(45, 212, 191, .04);
    aspect-ratio: 16 / 7;
}

.spectro {
    display: block;
    width: 100%;
    height: 100%;
}

.stage-overlay {
    position: absolute;
    inset: 0;
    padding: .85rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    pointer-events: none;
}

.pill {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    font-size: .78rem;
    font-weight: 600;
    padding: .35rem .75rem;
    border-radius: 999px;
    background: rgba(7, 9, 15, .65);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border);
}

.pill .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-faint);
}

.pill-idle .dot {
    background: var(--text-faint);
}

.pill-live .dot {
    background: var(--accent);
    box-shadow: 0 0 0 0 rgba(45, 212, 191, .6);
    animation: pulse 1.6s ease-out infinite;
}

.pill-error .dot {
    background: var(--hot);
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(45, 212, 191, .55);
    }

    100% {
        box-shadow: 0 0 0 10px rgba(45, 212, 191, 0);
    }
}

.readout {
    text-align: right;
    background: rgba(7, 9, 15, .65);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: .3rem .65rem;
    font-family: var(--mono);
}

.readout #peakFreq {
    display: block;
    font-size: 1.15rem;
    font-weight: 500;
    color: var(--accent);
    line-height: 1.1;
}

.readout .unit {
    font-size: .62rem;
    color: var(--text-faint);
    text-transform: uppercase;
    letter-spacing: .08em;
}

.detect-flash {
    position: absolute;
    inset: 0;
    border: 3px solid var(--hot);
    border-radius: var(--radius);
    opacity: 0;
    pointer-events: none;
}

.detect-flash.on {
    animation: flash .5s ease-out;
}

@keyframes flash {
    0% {
        opacity: .9;
    }

    100% {
        opacity: 0;
    }
}

/* ---- Controls ---- */
.controls {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    backdrop-filter: blur(10px);
}

.control-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
}

.primary-row {
    justify-content: flex-start;
}

.btn {
    font-family: inherit;
    font-size: .92rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    padding: .7rem 1.15rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    transition: transform .12s ease, filter .2s ease, background .2s ease, border-color .2s ease;
}

.btn:active {
    transform: translateY(1px);
}

.btn-primary {
    background: linear-gradient(120deg, var(--accent), #22b8a6);
    color: #04120f;
}

.btn-primary:hover {
    filter: brightness(1.08);
}

.btn-primary.listening {
    background: linear-gradient(120deg, var(--hot), #f43f5e);
    color: #1a0308;
}

.btn-ghost {
    background: transparent;
    color: var(--text-soft);
    border-color: var(--border);
}

.btn-ghost:hover {
    color: var(--text);
    border-color: var(--accent);
}

.btn-sm {
    font-size: .8rem;
    padding: .45rem .8rem;
}

/* ---- Switch ---- */
.switch {
    display: inline-flex;
    align-items: center;
    gap: .55rem;
    cursor: pointer;
    user-select: none;
    font-size: .86rem;
    color: var(--text-soft);
}

.switch input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.switch-track {
    width: 40px;
    height: 22px;
    border-radius: 999px;
    background: var(--border);
    position: relative;
    transition: background .2s ease;
    flex: 0 0 auto;
}

.switch-track::after {
    content: "";
    position: absolute;
    top: 3px;
    left: 3px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #fff;
    transition: transform .2s ease;
}

.switch input:checked+.switch-track {
    background: var(--accent);
}

.switch input:checked+.switch-track::after {
    transform: translateX(18px);
}

.switch input:focus-visible+.switch-track {
    box-shadow: 0 0 0 3px rgba(45, 212, 191, .35);
}

/* ---- Sliders ---- */
.sliders {
    gap: 1.5rem;
    align-items: stretch;
}

.slider {
    flex: 1 1 240px;
    display: flex;
    flex-direction: column;
    gap: .4rem;
}

.slider label {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    font-size: .86rem;
    font-weight: 600;
    color: var(--text);
}

.slider output {
    font-family: var(--mono);
    font-size: .82rem;
    color: var(--accent);
}

.slider input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 999px;
    background: var(--border);
    cursor: pointer;
}

.slider input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--bg-2);
    box-shadow: 0 2px 8px rgba(0, 0, 0, .4);
}

.slider input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--bg-2);
}

.hint {
    font-size: .74rem;
    color: var(--text-faint);
}

/* ---- Captures ---- */
.captures {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.captures-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.captures-head h2 {
    font-size: 1.1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: .5rem;
}

.count {
    font-family: var(--mono);
    font-size: .78rem;
    color: var(--accent);
    background: rgba(45, 212, 191, .1);
    border-radius: 999px;
    padding: .1rem .5rem;
}

.capture-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: .6rem;
}

.capture {
    display: flex;
    align-items: center;
    gap: .9rem;
    background: var(--surface-solid);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: .7rem .8rem;
    animation: rise .25s ease;
}

@keyframes rise {
    from {
        opacity: 0;
        transform: translateY(6px);
    }

    to {
        opacity: 1;
        transform: none;
    }
}

.capture-wave {
    flex: 1 1 auto;
    width: 100%;
    height: 46px;
    background: #04060a;
    border-radius: 8px;
}

.capture-meta {
    flex: 0 0 auto;
    text-align: right;
    font-family: var(--mono);
    min-width: 76px;
}

.capture-meta .cf {
    display: block;
    font-size: .9rem;
    color: var(--accent);
}

.capture-meta .ct {
    font-size: .68rem;
    color: var(--text-faint);
}

.capture-actions {
    flex: 0 0 auto;
    display: flex;
    gap: .3rem;
}

.ibtn {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-soft);
    cursor: pointer;
    font-size: .95rem;
    transition: color .15s ease, border-color .15s ease, background .15s ease;
}

.ibtn:hover {
    color: var(--text);
    border-color: var(--accent);
    background: rgba(45, 212, 191, .08);
}

.ibtn.playing {
    color: var(--accent);
    border-color: var(--accent);
}

.ibtn.danger:hover {
    color: var(--hot);
    border-color: var(--hot);
    background: rgba(251, 113, 133, .08);
}

.captures-empty {
    color: var(--text-faint);
    font-size: .88rem;
    text-align: center;
    padding: 1.25rem;
    border: 1px dashed var(--border);
    border-radius: var(--radius-sm);
}

/* ---- Note ---- */
.note {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: .5rem 1rem;
    color: var(--text-soft);
    font-size: .88rem;
}

.note summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--text);
    padding: .5rem 0;
    list-style: none;
}

.note summary::-webkit-details-marker {
    display: none;
}

.note summary::before {
    content: "?";
    display: inline-grid;
    place-items: center;
    width: 20px;
    height: 20px;
    margin-right: .55rem;
    border-radius: 50%;
    background: var(--accent);
    color: #04120f;
    font-size: .75rem;
    font-weight: 700;
    vertical-align: middle;
}

.note p {
    padding: 0 0 .75rem;
}

.note strong {
    color: var(--text);
}

/* ---- Footer ---- */
.footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    font-size: .82rem;
    color: var(--text-faint);
    padding-top: .5rem;
}

.back {
    color: var(--text-soft);
    text-decoration: none;
    font-weight: 600;
    transition: color .15s ease;
}

.back:hover {
    color: var(--accent);
}

@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important;
    }
}