/* === Reset & Base === */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --color-bg: #f5f5f0;
    --color-surface: #ffffff;
    --color-border: #e0e0dc;
    --color-text: #2c2c2c;
    --color-text-muted: #777;
    --color-primary: #2c2c2c;
    --color-primary-hover: #444;
    --color-accent: #5a7d5a;
    --color-error: #c44;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    min-height: 100vh;
}

/* === Header === */
header {
    text-align: center;
    padding: 2rem 1rem 1rem;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.subtitle {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-top: 0.25rem;
}

/* === Main === */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

/* === Upload Area === */
.upload-area {
    max-width: 600px;
    margin: 2rem auto;
}

.upload-dropzone {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius);
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    background: var(--color-surface);
}

.upload-dropzone:hover,
.upload-dropzone.dragover {
    border-color: var(--color-accent);
    background: #f9faf8;
}

.upload-icon {
    color: var(--color-text-muted);
    margin-bottom: 1rem;
}

.upload-text {
    font-size: 1.1rem;
    font-weight: 500;
}

.upload-subtext {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-top: 0.25rem;
}

.upload-formats {
    color: var(--color-text-muted);
    font-size: 0.75rem;
    margin-top: 1rem;
}

.file-input {
    position: absolute;
    width: 0;
    height: 0;
    opacity: 0;
    pointer-events: none;
}

.upload-error {
    text-align: center;
    padding: 2rem;
    color: var(--color-error);
}

/* === Workspace Layout === */
.workspace {
    width: 100%;
}

.workspace-layout {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 1.5rem;
    align-items: start;
}

@media (max-width: 768px) {
    .workspace-layout {
        grid-template-columns: 1fr;
    }
}

/* === Settings Panel === */
.settings-panel {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.25rem;
    box-shadow: var(--shadow);
}

.settings-panel h2 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--color-border);
}

.setting-group {
    margin-bottom: 1rem;
}

.setting-group h3 {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
}

.setting-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.setting-row label {
    font-size: 0.85rem;
    min-width: 100px;
    flex-shrink: 0;
}

.setting-row input[type="number"],
.setting-row select {
    flex: 1;
    padding: 0.35rem 0.5rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 0.85rem;
    background: var(--color-surface);
}

.setting-row input[type="range"] {
    flex: 1;
    accent-color: var(--color-accent);
}

.setting-row input[type="color"] {
    width: 40px;
    height: 30px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: 2px;
    cursor: pointer;
}

.range-value {
    font-size: 0.85rem;
    font-weight: 500;
    min-width: 2rem;
    text-align: right;
}

/* === Buttons === */
.action-buttons {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.download-buttons {
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: background 0.15s, color 0.15s;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--color-primary-hover);
}

.btn-secondary {
    background: var(--color-bg);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-border);
}

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

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

/* === Preview Panel === */
.preview-panel {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.25rem;
    box-shadow: var(--shadow);
    min-height: 400px;
}

.preview-image-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    background: #fafaf8;
    border-radius: 4px;
    overflow: hidden;
}

.preview-image {
    max-width: 100%;
    height: auto;
    display: block;
}

.preview-caption {
    text-align: center;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: 0.75rem;
}

.preview-info {
    color: var(--color-accent);
    font-weight: 500;
}

/* === Palette Preview === */
.palette-preview {
    margin-top: 1rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--color-border);
}

.palette-preview h3 {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
}

.palette-swatches {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
}

.palette-swatch {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.swatch-color {
    width: 28px;
    height: 28px;
    border-radius: 4px;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.swatch-label {
    font-size: 0.65rem;
    color: var(--color-text-muted);
}

/* === Spinner === */
.spinner {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.spinner-dot {
    width: 16px;
    height: 16px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* HTMX indicator — hidden by default, shown when request in flight */
.htmx-indicator {
    display: none;
}
.htmx-request .htmx-indicator,
.htmx-request.htmx-indicator {
    display: flex;
}