:root {
    --sp-ink: #17211f;
    --sp-subtle: #67736f;
    --sp-border: #dce5e1;
    --sp-surface: #ffffff;
    --sp-surface-soft: #f4f7f6;
    --sp-dark: #111917;
    --sp-green: #1b9b77;
}

#main_bg {
    position: fixed;
    z-index: -1;
    width: 100%;
    min-height: 100vh;
    background-image:
        linear-gradient(120deg, rgba(10, 34, 29, .22), rgba(229, 246, 240, .14)),
        url(../assets/images/background/miku_2.webp);
    background-position: center;
    background-size: cover;
}

#panel {
    padding: 0;
    overflow-y: auto;
    color: var(--sp-ink);
    background: rgba(247, 250, 249, .96);
    border-color: rgba(255, 255, 255, .82);
    font-family: var(--app-font-serif);
}

button,
select,
input {
    font: inherit;
}

button:focus-visible,
select:focus-visible,
label:focus-within {
    outline: 3px solid rgba(27, 155, 119, .2);
    outline-offset: 2px;
}

.sp-hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 24px 26px 21px;
    border-bottom: 1px solid var(--sp-border);
    background:
        radial-gradient(circle at 78% -80%, rgba(38, 168, 132, .16), transparent 38%),
        rgba(255, 255, 255, .76);
}

.sp-hero-copy {
    min-width: 0;
}

.sp-eyebrow,
.sp-results-kicker {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
    color: #648078;
    font: 700 10px/1.2 var(--app-font-mono);
    letter-spacing: .14em;
}

.sp-eyebrow-mark {
    width: 18px;
    height: 2px;
    border-radius: 999px;
    background: var(--sp-green);
}

.sp-hero h1 {
    margin: 0;
    color: #13231f;
    font-size: clamp(24px, 2.3vw, 34px);
    font-weight: 800;
    line-height: 1.18;
    letter-spacing: -.04em;
}

.sp-hero p {
    margin: 7px 0 0;
    color: var(--sp-subtle);
    font-size: 13px;
    line-height: 1.65;
}

.sp-privacy-pill {
    display: flex;
    flex: 0 0 auto;
    align-items: center;
    gap: 10px;
    min-width: 142px;
    padding: 10px 13px;
    border: 1px solid #d9e8e3;
    border-radius: 12px;
    background: rgba(255, 255, 255, .78);
    box-shadow: 0 5px 18px rgba(22, 70, 57, .06);
}

.sp-privacy-pill svg {
    width: 22px;
    height: 22px;
    fill: none;
    stroke: var(--sp-green);
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.sp-privacy-pill span {
    display: grid;
    gap: 1px;
}

.sp-privacy-pill strong {
    font-size: 12px;
}

.sp-privacy-pill small {
    color: var(--sp-subtle);
    font-size: 10px;
}

.sp-workbench {
    display: grid;
    grid-template-columns: 306px minmax(0, 1fr);
    gap: 18px;
    align-items: start;
    padding: 18px 22px 24px;
}

.sp-control-panel {
    position: sticky;
    top: 0;
    overflow: hidden;
    border: 1px solid var(--sp-border);
    border-radius: 15px;
    background: var(--sp-surface);
    box-shadow: 0 10px 30px rgba(24, 51, 44, .07);
}

.sp-control-section {
    padding: 17px;
}

.sp-control-section + .sp-control-section {
    border-top: 1px solid var(--sp-border);
}

.sp-section-title {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
}

.sp-section-title > div {
    display: grid;
    min-width: 0;
}

.sp-section-title strong {
    color: #192622;
    font-size: 13px;
}

.sp-section-title small {
    overflow: hidden;
    margin-top: 2px;
    color: #83908c;
    font-size: 10.5px;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sp-step {
    display: grid;
    flex: 0 0 auto;
    width: 28px;
    height: 28px;
    place-items: center;
    border-radius: 8px;
    color: var(--sp-green);
    background: #eaf7f3;
    font: 800 10px/1 var(--app-font-mono);
}

.sp-drop-zone {
    display: grid;
    min-height: 126px;
    padding: 17px;
    place-items: center;
    align-content: center;
    border: 1.5px dashed #9fcfc1;
    border-radius: 12px;
    color: #536560;
    background:
        linear-gradient(rgba(255, 255, 255, .86), rgba(247, 252, 250, .9)),
        repeating-linear-gradient(135deg, transparent 0 9px, rgba(27, 155, 119, .05) 9px 10px);
    text-align: center;
    cursor: pointer;
    transition: border-color .2s ease, background .2s ease, transform .2s ease, box-shadow .2s ease;
}

.sp-drop-zone:hover,
.sp-drop-zone.drag-over {
    border-color: var(--sp-green);
    background: #effaf6;
    box-shadow: inset 0 0 0 3px rgba(27, 155, 119, .07);
    transform: translateY(-1px);
}

.sp-drop-icon {
    display: grid;
    width: 34px;
    height: 34px;
    margin-bottom: 8px;
    place-items: center;
    border-radius: 10px;
    color: var(--sp-green);
    background: #e4f5ef;
}

.sp-drop-icon svg {
    width: 18px;
    height: 18px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.sp-drop-zone strong {
    color: #2e443e;
    font-size: 12px;
}

.sp-drop-zone small {
    margin-top: 5px;
    color: #899692;
    font: 600 9.5px/1.4 var(--app-font-mono);
    letter-spacing: .02em;
}

.sp-source-card[hidden],
.sp-drop-zone[hidden] {
    display: none;
}

.sp-source-card {
    padding: 9px;
    border: 1px solid #dfe8e5;
    border-radius: 12px;
    background: #fafcfb;
}

.sp-source-stage,
.sp-preview-stage {
    position: relative;
    display: grid;
    overflow: hidden;
    place-items: center;
    background-color: #17201e;
    background-image:
        linear-gradient(45deg, #202a27 25%, transparent 25%),
        linear-gradient(-45deg, #202a27 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #202a27 75%),
        linear-gradient(-45deg, transparent 75%, #202a27 75%);
    background-position: 0 0, 0 8px, 8px -8px, -8px 0;
    background-size: 16px 16px;
}

.sp-source-stage {
    height: 150px;
    border-radius: 8px;
}

.sp-source-stage canvas,
.sp-preview-stage canvas {
    display: block;
    width: auto;
    height: auto;
    max-width: 100%;
    max-height: 100%;
    image-rendering: auto;
}

.sp-source-name {
    overflow: hidden;
    margin: 9px 2px 7px;
    color: #263631;
    font-size: 11px;
    font-weight: 700;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sp-source-meta,
.sp-stat-row {
    display: grid;
}

.sp-source-meta {
    grid-template-columns: repeat(3, 1fr);
    gap: 5px;
}

.sp-source-meta > span,
.sp-stat-row > span {
    display: grid;
    gap: 2px;
}

.sp-source-meta > span {
    padding: 7px 5px;
    border-radius: 7px;
    background: #f0f4f2;
    text-align: center;
}

.sp-source-meta small,
.sp-stat-row small {
    color: #87938f;
    font: 700 8px/1.2 var(--app-font-mono);
    letter-spacing: .08em;
}

.sp-source-meta strong {
    overflow: hidden;
    font: 700 9.5px/1.25 var(--app-font-mono);
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sp-text-button {
    display: block;
    width: 100%;
    margin-top: 7px;
    padding: 6px;
    border: 0;
    color: #4b6e64;
    background: transparent;
    font-size: 10.5px;
    cursor: pointer;
}

.sp-text-button:hover {
    color: var(--sp-green);
}

.sp-status {
    display: flex;
    align-items: center;
    gap: 8px;
    min-height: 32px;
    margin-top: 10px;
    padding: 0 10px;
    border: 1px solid #e2e9e6;
    border-radius: 9px;
    color: #71807b;
    background: #f7f9f8;
    font-size: 10.5px;
}

.sp-status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #9aa6a2;
}

.sp-status.is-loading .sp-status-dot {
    background: #e0a126;
    box-shadow: 0 0 0 4px rgba(224, 161, 38, .12);
    animation: spPulse 1s ease-in-out infinite;
}

.sp-status.is-success {
    color: #25735d;
    border-color: #cce9df;
    background: #eff9f5;
}

.sp-status.is-success .sp-status-dot {
    background: #28a77f;
}

.sp-status.is-error {
    color: #a84747;
    border-color: #efd0d0;
    background: #fff3f3;
}

.sp-status.is-error .sp-status-dot {
    background: #df5a5a;
}

@keyframes spPulse {
    50% { opacity: .42; }
}

.sp-output-settings {
    display: grid;
    gap: 13px;
}

.sp-output-settings .sp-section-title {
    margin-bottom: 0;
}

.sp-fieldset {
    min-width: 0;
    margin: 0;
    padding: 0;
    border: 0;
}

.sp-fieldset legend,
.sp-select-field > span {
    display: block;
    margin-bottom: 7px;
    color: #53635e;
    font-size: 10.5px;
    font-weight: 700;
}

.sp-field-note {
    display: block;
    margin-top: 6px;
    color: #8a9692;
    font-size: 9px;
    line-height: 1.45;
}

.sp-segmented {
    display: grid;
    grid-template-columns: 1fr 1fr;
    padding: 3px;
    border-radius: 9px;
    background: #edf2f0;
}

.sp-segmented input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.sp-segmented label {
    padding: 7px 5px;
    border-radius: 7px;
    color: #6e7b77;
    font-size: 10.5px;
    font-weight: 700;
    text-align: center;
    cursor: pointer;
    transition: color .18s ease, background .18s ease, box-shadow .18s ease;
}

.sp-segmented input:checked + label {
    color: #176e57;
    background: #fff;
    box-shadow: 0 2px 8px rgba(27, 68, 56, .11);
}

.sp-select-field select {
    width: 100%;
    padding: 9px 31px 9px 10px;
    border: 1px solid #d9e3df;
    border-radius: 9px;
    color: #2f403b;
    background: #fff;
    font-size: 11px;
    cursor: pointer;
}

.sp-primary-button,
.sp-download-all,
.sp-icon-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0;
    cursor: pointer;
    transition: transform .18s ease, box-shadow .18s ease, opacity .18s ease, background .18s ease;
}

.sp-primary-button {
    gap: 8px;
    width: 100%;
    padding: 10px 14px;
    border-radius: 10px;
    color: #fff;
    background: linear-gradient(135deg, #21aa82, #14775f);
    box-shadow: 0 7px 18px rgba(25, 139, 106, .22);
    font-size: 11.5px;
    font-weight: 700;
}

.sp-primary-button svg,
.sp-download-all svg,
.sp-icon-button svg {
    width: 16px;
    height: 16px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.sp-primary-button:hover:not(:disabled),
.sp-download-all:hover:not(:disabled),
.sp-icon-button:hover:not(:disabled) {
    transform: translateY(-1px);
}

.sp-primary-button:disabled,
.sp-download-all:disabled,
.sp-icon-button:disabled {
    opacity: .42;
    cursor: not-allowed;
    box-shadow: none;
}

.sp-results {
    min-width: 0;
}

.sp-results-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    min-height: 50px;
    margin-bottom: 12px;
}

.sp-results-kicker {
    margin-bottom: 3px;
}

.sp-results-head h2 {
    margin: 0;
    color: #1d2a26;
    font-size: 17px;
    line-height: 1.25;
}

.sp-results-head h2 span {
    margin-left: 6px;
    color: #8a9692;
    font: 600 9px/1 var(--app-font-mono);
    letter-spacing: .04em;
}

.sp-download-all {
    gap: 7px;
    padding: 8px 12px;
    border: 1px solid #cee2dc;
    border-radius: 9px;
    color: #27745e;
    background: #fff;
    font-size: 10.5px;
    font-weight: 700;
}

.sp-download-all:hover:not(:disabled) {
    border-color: #a9d2c6;
    background: #f1faf7;
}

.sp-channel-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.sp-channel-card {
    --channel: #71807b;
    --channel-soft: rgba(113, 128, 123, .12);
    min-width: 0;
    overflow: hidden;
    border: 1px solid var(--sp-border);
    border-radius: 14px;
    background: var(--sp-surface);
    box-shadow: 0 7px 22px rgba(24, 51, 44, .055);
    transition: border-color .22s ease, box-shadow .22s ease, transform .22s ease;
}

.sp-channel-card.is-ready:hover {
    border-color: color-mix(in srgb, var(--channel) 32%, #dce5e1);
    box-shadow: 0 11px 28px rgba(24, 51, 44, .09);
    transform: translateY(-2px);
}

.channel-r { --channel: #e64c59; --channel-soft: rgba(230, 76, 89, .11); }
.channel-g { --channel: #29a96b; --channel-soft: rgba(41, 169, 107, .11); }
.channel-b { --channel: #4288e8; --channel-soft: rgba(66, 136, 232, .11); }
.channel-a { --channel: #9b67dd; --channel-soft: rgba(155, 103, 221, .11); }

.sp-channel-head {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 11px 12px;
    border-bottom: 1px solid #e6ecea;
}

.sp-channel-letter {
    display: grid;
    flex: 0 0 auto;
    width: 30px;
    height: 30px;
    place-items: center;
    border: 1px solid color-mix(in srgb, var(--channel) 35%, transparent);
    border-radius: 9px;
    color: var(--channel);
    background: var(--channel-soft);
    font: 800 13px/1 var(--app-font-mono);
}

.sp-channel-head > div {
    min-width: 0;
}

.sp-channel-head h3,
.sp-channel-head p {
    overflow: hidden;
    margin: 0;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sp-channel-head h3 {
    color: #26342f;
    font-size: 11.5px;
}

.sp-channel-head p {
    margin-top: 2px;
    color: #8a9591;
    font: 600 8.5px/1.2 var(--app-font-mono);
}

.sp-icon-button {
    flex: 0 0 auto;
    width: 30px;
    height: 30px;
    margin-left: auto;
    border: 1px solid #dbe5e1;
    border-radius: 8px;
    color: var(--channel);
    background: #fff;
}

.sp-icon-button:hover:not(:disabled) {
    border-color: color-mix(in srgb, var(--channel) 35%, #dbe5e1);
    background: var(--channel-soft);
}

.sp-preview-stage {
    height: clamp(142px, 15vw, 205px);
    margin: 10px;
    border-radius: 9px;
}

.sp-empty-state {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    align-content: center;
    color: rgba(255, 255, 255, .33);
    pointer-events: none;
}

.sp-empty-state strong {
    font: 800 37px/1 var(--app-font-mono);
}

.sp-empty-state span {
    margin-top: 6px;
    font-size: 9px;
    letter-spacing: .12em;
}

.sp-channel-card.is-ready .sp-empty-state {
    display: none;
}

.sp-stat-row {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    padding: 0 11px 9px;
}

.sp-stat-row > span {
    padding: 0 7px;
    border-left: 1px solid #e8edeb;
}

.sp-stat-row > span:first-child {
    padding-left: 0;
    border-left: 0;
}

.sp-stat-row strong {
    overflow: hidden;
    color: #34433e;
    font: 700 10.5px/1.3 var(--app-font-mono);
    text-overflow: ellipsis;
}

.sp-histogram {
    height: 49px;
    padding: 0 10px 10px;
}

.sp-histogram canvas {
    display: block;
    width: 100%;
    height: 100%;
    border-radius: 6px;
}

@media (max-width: 1160px) {
    .sp-workbench {
        grid-template-columns: 280px minmax(0, 1fr);
    }

    .sp-channel-grid {
        grid-template-columns: 1fr;
    }

    .sp-preview-stage {
        height: 210px;
    }
}

@media (max-width: 840px) {
    .sp-workbench {
        grid-template-columns: 1fr;
    }

    .sp-control-panel {
        position: static;
    }

    .sp-control-panel {
        display: grid;
        grid-template-columns: 1fr 1fr;
    }

    .sp-control-section + .sp-control-section {
        border-top: 0;
        border-left: 1px solid var(--sp-border);
    }

    .sp-channel-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .sp-preview-stage {
        height: 165px;
    }
}

@media (max-width: 640px) {
    .sp-hero {
        align-items: flex-start;
        padding: 19px;
    }

    .sp-privacy-pill {
        min-width: 0;
        padding: 8px;
    }

    .sp-privacy-pill span {
        display: none;
    }

    .sp-workbench {
        padding: 13px;
    }

    .sp-control-panel,
    .sp-channel-grid {
        grid-template-columns: 1fr;
    }

    .sp-control-section + .sp-control-section {
        border-top: 1px solid var(--sp-border);
        border-left: 0;
    }

    .sp-results-head {
        align-items: flex-end;
    }

    .sp-preview-stage {
        height: 190px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .sp-status.is-loading .sp-status-dot {
        animation: none;
    }
}