:root {
    color-scheme: light dark;
    --bg: #f5f7fb;
    --bg-soft: #ffffff;
    --text: #0f172a;
    --muted: #475569;
    --border: #d9e0ea;
    --accent: #0f172a;
    --accent-contrast: #ffffff;
    --danger: #b91c1c;
    --ring: rgba(14, 116, 144, 0.34);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0a0f19;
        --bg-soft: #111827;
        --text: #e5e7eb;
        --muted: #9ca3af;
        --border: #243145;
        --accent: #e5e7eb;
        --accent-contrast: #0b1020;
        --danger: #fca5a5;
        --ring: rgba(125, 211, 252, 0.34);
    }
}

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

html,
body {
    margin: 0;
    min-height: 100%;
}

body {
    font-family: "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
    color: var(--text);
    background:
        radial-gradient(
            circle at top,
            rgba(56, 189, 248, 0.12),
            transparent 50%
        ),
        radial-gradient(
            circle at 80% 80%,
            rgba(148, 163, 184, 0.12),
            transparent 45%
        ),
        var(--bg);
}

.app {
    width: min(1120px, calc(100% - 2rem));
    margin: 2rem auto;
    display: grid;
    gap: 1rem;
}

.header h1 {
    margin: 0 0 0.35rem;
    font-size: clamp(1.4rem, 1.8vw, 2rem);
    letter-spacing: 0.01em;
}

.header {
    position: relative;
}

.header p {
    margin: 0;
    color: var(--muted);
}

.github-icon-button {
    position: absolute;
    top: 0;
    right: 0;
    width: 1.5rem;
    height: 1.5rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--muted);
    text-decoration: none;
}

.github-icon-button svg {
    width: 1.15rem;
    height: 1.15rem;
    fill: currentColor;
}

.github-icon-button:hover {
    color: var(--text);
}

.github-icon-button:focus-visible {
    outline: 2px solid transparent;
    box-shadow: 0 0 0 4px var(--ring);
    border-radius: 6px;
}

.controls,
.preview-card {
    background: color-mix(in srgb, var(--bg-soft) 92%, transparent);
    border: 1px solid var(--border);
    border-radius: 14px;
    backdrop-filter: blur(6px);
}

.controls {
    padding: 1rem;
    display: grid;
    gap: 0.9rem;
}

.field {
    display: grid;
    gap: 0.4rem;
}

.field-wide {
    min-width: 0;
}

.watermark-input-row {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.watermark-input-row input[type="text"] {
    flex: 1 1 220px;
}

.slider-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(180px, 1fr));
    gap: 0.9rem;
}

.field-color {
    grid-column: 1 / -1;
}

.advanced {
    border: 1px solid var(--border);
    border-radius: 10px;
    background: color-mix(in srgb, var(--bg-soft) 96%, transparent);
    padding: 0.6rem 0.7rem;
}

.advanced > summary {
    list-style: none;
    cursor: pointer;
    color: var(--muted);
    font-size: 0.9rem;
    font-weight: 600;
}

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

.advanced > summary::before {
    content: "▸";
    margin-right: 0.4rem;
}

.advanced[open] > summary::before {
    content: "▾";
}

.advanced[open] .slider-grid {
    margin-top: 0.7rem;
}

.label-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
}

.label-row span {
    color: var(--muted);
    font-size: 0.82rem;
    font-variant-numeric: tabular-nums;
}

label {
    font-size: 0.9rem;
    color: var(--muted);
}

input[type="text"] {
    width: 100%;
    min-height: 2.6rem;
    padding: 0.6rem 0.75rem;
    border-radius: 10px;
    border: 1px solid var(--border);
    color: var(--text);
    background: color-mix(in srgb, var(--bg-soft) 95%, transparent);
}

.color-picker-row {
    display: flex;
    align-items: center;
    gap: 0.45rem;
}

.color-picker-row span {
    color: var(--muted);
    font-size: 0.82rem;
    font-variant-numeric: tabular-nums;
}

.color-input {
    width: 2.4rem;
    height: 1.6rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: none;
    padding: 0;
    cursor: pointer;
}

.color-input::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-input::-webkit-color-swatch {
    border: none;
    border-radius: 5px;
}

.color-input::-moz-color-swatch {
    border: none;
    border-radius: 5px;
}

.slider {
    --slider-progress: 0%;
    width: 100%;
    margin: 0;
    height: 1.8rem;
    background: transparent;
    appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
}

.slider::-webkit-slider-runnable-track {
    height: 0.42rem;
    border-radius: 999px;
    background: linear-gradient(
        to right,
        var(--accent) 0%,
        var(--accent) var(--slider-progress),
        color-mix(in srgb, var(--border) 75%, transparent)
            var(--slider-progress),
        color-mix(in srgb, var(--border) 75%, transparent) 100%
    );
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 1.1rem;
    height: 1.1rem;
    margin-top: -0.34rem;
    border-radius: 50%;
    border: 2px solid var(--bg-soft);
    background: var(--accent);
    box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent) 30%, var(--border));
}

.slider::-moz-range-track {
    height: 0.42rem;
    border: none;
    border-radius: 999px;
    background: color-mix(in srgb, var(--border) 75%, transparent);
}

.slider::-moz-range-progress {
    height: 0.42rem;
    border-radius: 999px;
    background: var(--accent);
}

.slider::-moz-range-thumb {
    width: 1.1rem;
    height: 1.1rem;
    border-radius: 50%;
    border: 2px solid var(--bg-soft);
    background: var(--accent);
    box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent) 30%, var(--border));
}

input:focus-visible,
button:focus-visible,
.preview-shell:focus-visible,
.slider:focus-visible {
    outline: 2px solid transparent;
    box-shadow: 0 0 0 4px var(--ring);
}

button {
    min-height: 2.6rem;
    border: none;
    border-radius: 10px;
    font: inherit;
    font-weight: 650;
    padding: 0.65rem 1rem;
    cursor: pointer;
    background: var(--accent);
    color: var(--accent-contrast);
}

.button-secondary {
    background: color-mix(in srgb, var(--bg-soft) 92%, transparent);
    color: var(--text);
    border: 1px solid var(--border);
}

.button-compact {
    min-height: 2.3rem;
    padding: 0.5rem 0.8rem;
    font-weight: 600;
    white-space: nowrap;
}

button:disabled {
    cursor: not-allowed;
    opacity: 0.55;
}

.footer button.is-loading,
.footer button.is-loading:disabled {
    opacity: 1;
    position: relative;
    color: transparent;
    cursor: wait;
}

.footer button.is-loading::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    width: 1rem;
    height: 1rem;
    margin-left: -0.5rem;
    margin-top: -0.5rem;
    border: 2px solid var(--accent-contrast);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.status,
.error {
    margin: 0;
    min-height: 1.25rem;
    font-size: 0.9rem;
}

.status:empty,
.error:empty {
    display: none;
}

.status {
    color: var(--muted);
}

.video-progress {
    display: flex;
    align-items: center;
    gap: 0.55rem;
}

.video-progress[hidden] {
    display: none !important;
}

.video-progress-track {
    flex: 1 1 auto;
    height: 0.45rem;
    border-radius: 999px;
    background: color-mix(in srgb, var(--border) 80%, transparent);
    overflow: hidden;
}

.video-progress-fill {
    height: 100%;
    width: 0%;
    background: var(--accent);
    border-radius: inherit;
    transition: width 120ms linear;
}

.video-progress span {
    min-width: 2.5rem;
    text-align: right;
    color: var(--muted);
    font-size: 0.83rem;
    font-variant-numeric: tabular-nums;
}

.error {
    color: var(--danger);
}

.preview-card {
    padding: 0.75rem;
}

.preview-shell {
    position: relative;
    width: 100%;
    min-height: min(68vh, 640px);
    display: grid;
    place-items: center;
    border-radius: 10px;
    border: 1px dashed var(--border);
    background: color-mix(in srgb, var(--bg-soft) 82%, transparent);
    overflow: hidden;
    cursor: pointer;
    transition:
        border-color 120ms ease,
        background-color 120ms ease;
}

.preview-shell.has-media {
    cursor: default;
}

.preview-shell.is-redaction-mode {
    cursor: crosshair;
    touch-action: none;
    overscroll-behavior: contain;
}

.preview-shell:hover {
    border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
}

.preview-shell.is-drop-target {
    border-color: color-mix(in srgb, var(--accent) 60%, var(--border));
    background: color-mix(in srgb, var(--bg-soft) 70%, transparent);
}

#previewCanvas {
    max-width: 100%;
    height: auto;
    display: none;
    border-radius: 8px;
    touch-action: manipulation;
}

.preview-shell.is-redaction-mode #previewCanvas {
    touch-action: none;
}

#previewHint {
    margin: 0;
    padding: 1rem;
    text-align: center;
    color: var(--muted);
}

.preview-meta {
    margin-top: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.redaction-hint {
    margin: 0;
    color: var(--muted);
    font-size: 0.88rem;
}

.redaction-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.visually-hidden {
    position: absolute !important;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.8rem;
    padding: 0.1rem 0 0.4rem;
}

.footer button {
    min-width: 10.5rem;
}

@media (max-width: 880px) {
    .slider-grid {
        grid-template-columns: 1fr;
    }

    .redaction-actions {
        width: 100%;
    }

    .redaction-actions button {
        flex: 1 1 0;
    }

    .app {
        width: min(1120px, calc(100% - 1rem));
        margin: 1rem auto;
        gap: 0.55rem;
    }

    .controls {
        padding: 0.8rem;
    }

    .preview-card {
        padding: 0.6rem;
    }
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}