@import "../../style.css";

:root {
    --text: var(--ink);
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
}

.app {
    max-width: 1180px;
    margin: 48px auto 64px;
    padding: 0 var(--space-3);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.layout {
    display: grid;
    gap: var(--space-3);
}

.layout--split {
    grid-template-columns: minmax(320px, 420px) minmax(0, 1fr);
    align-items: start;
}

.header {
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.header h1 {
    margin: 0;
    font-size: clamp(28px, 4vw, 34px);
    letter-spacing: 0.01em;
}

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

.eyebrow {
    display: inline-flex;
    align-self: center;
    padding: 4px 12px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.04);
    color: var(--muted);
    font-size: 12px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.panel {
    background: linear-gradient(140deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0));
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: var(--space-4);
}

.controls-panel {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.upload-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-2);
}

.file-field,
.range-field {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.field-label {
    font-size: 13px;
    color: var(--muted);
}

input[type="file"],
input[type="range"] {
    width: 100%;
}

input[type="file"] {
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--bg-alt);
    color: var(--text);
}

input[type="range"] {
    accent-color: var(--accent);
    cursor: pointer;
}

.control-grid {
    display: grid;
    gap: var(--space-3);
}

.toggle-row {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
}

.toggle-item {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text);
    font-size: 14px;
}

.toggle-item input {
    accent-color: var(--accent);
}

.nudge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-2);
}

.step-buttons {
    display: flex;
    gap: 8px;
}

.micro-button {
    flex: 1;
    padding: 8px 10px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.03);
    color: var(--text);
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: border-color 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
}

.micro-button:hover {
    border-color: rgba(56, 189, 248, 0.6);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.micro-button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.ghost-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 14px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.02);
    color: var(--text);
    cursor: pointer;
    transition: border-color 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
}

.ghost-button:hover {
    border-color: rgba(56, 189, 248, 0.6);
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.ghost-button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

.hint {
    margin: 0;
    color: var(--muted);
    font-size: 13px;
}

.viewer-panel {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.viewer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.viewer-header h2 {
    margin: 0;
    font-size: 20px;
}

.meta {
    color: var(--muted);
    font-size: 13px;
}

.viewer-stage {
    position: relative;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: #0d1525;
    overflow: hidden;
    min-height: 520px;
    cursor: grab;
    outline: none;
    --scale: 1;
    --pan-x: 0px;
    --pan-y: 0px;
    --offset-x: 0px;
    --offset-y: 0px;
    --overlay-opacity: 0.5;
}

.viewer-stage:active {
    cursor: grabbing;
}

.viewer-stage:focus-visible {
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.35);
}

.checkerboard {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(45deg, rgba(255, 255, 255, 0.06) 25%, transparent 25%),
        linear-gradient(-45deg, rgba(255, 255, 255, 0.06) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, rgba(255, 255, 255, 0.06) 75%),
        linear-gradient(-45deg, transparent 75%, rgba(255, 255, 255, 0.06) 75%);
    background-size: 32px 32px;
    background-position: 0 0, 0 16px, 16px -16px, -16px 0;
}

.layer {
    position: absolute;
    left: 50%;
    top: 50%;
    max-width: none;
    max-height: none;
    transform-origin: center;
    user-select: none;
    pointer-events: none;
}

.base-layer {
    transform: translate(calc(-50% + var(--pan-x)), calc(-50% + var(--pan-y))) scale(var(--scale));
}

.overlay-layer {
    opacity: var(--overlay-opacity);
    transform: translate(
        calc(-50% + var(--pan-x) + var(--offset-x)),
        calc(-50% + var(--pan-y) + var(--offset-y))
    ) scale(var(--scale));
}

.overlay-layer.is-difference {
    mix-blend-mode: difference;
}

.layer.is-hidden {
    display: none;
}

.empty-state {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    color: var(--muted);
    font-size: 15px;
    text-align: center;
    padding: var(--space-3);
}

.mono {
    font-family: var(--font-mono);
}

@media (max-width: 720px) {
    .app {
        margin: 32px 0 48px;
    }

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

    .header {
        text-align: left;
    }

    .eyebrow {
        align-self: flex-start;
    }

    .viewer-stage {
        min-height: 380px;
    }
}