/* MTF Tattoo Adapter Tool — minimal dark UI, no framework. */

:root {
    --bg:        #14171b;
    --bg-card:   #1c2127;
    --bg-input:  #0f1216;
    --fg:        #d8dee4;
    --fg-muted:  #8b949e;
    --accent:    #58a6ff;
    --accent-fg: #ffffff;
    --warn:      #f0883e;
    --error:     #f85149;
    --success:   #56d364;
    --border:    #30363d;
    --code-bg:   #0f1216;
    --radius:    6px;
    --gap:       16px;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--fg);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 15px;
    line-height: 1.55;
}

header, main, footer {
    max-width: 760px;
    margin: 0 auto;
    padding: 0 24px;
}

header {
    padding-top: 48px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 32px;
}

header h1 {
    font-size: 28px;
    margin: 0 0 8px;
    font-weight: 600;
}

.subtitle {
    color: var(--fg-muted);
    margin: 0;
    font-size: 14px;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

code {
    font-family: "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 0.88em;
    background: var(--code-bg);
    padding: 1px 5px;
    border-radius: 3px;
    border: 1px solid var(--border);
}

section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 22px;
    margin-bottom: var(--gap);
}

section h2 {
    margin: 0 0 16px;
    font-size: 16px;
    font-weight: 600;
    color: var(--fg);
}

/* ─── Form ──────────────────────────────────────────────────────────────── */
.form-card .form-hint {
    margin: 0 0 16px;
    color: var(--fg-muted);
    font-size: 12px;
    line-height: 1.5;
}
.form-card .form-hint strong {
    color: var(--fg);
    font-weight: 600;
}

.form-card label {
    display: block;
    margin-top: 14px;
    margin-bottom: 6px;
    font-size: 13px;
    font-weight: 500;
}

.form-card label:first-of-type {
    margin-top: 0;
}

.form-card .hint {
    display: block;
    font-weight: 400;
    color: var(--fg-muted);
    font-size: 12px;
    margin-top: 2px;
}

.form-card input,
.form-card select {
    width: 100%;
    padding: 8px 10px;
    background: var(--bg-input);
    color: var(--fg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 14px;
    outline: none;
    transition: border-color 0.15s;
}

.form-card input:focus,
.form-card select:focus {
    border-color: var(--accent);
}

.form-card input:invalid:not(:placeholder-shown) {
    border-color: var(--error);
}

/* ─── Drop zone ─────────────────────────────────────────────────────────── */
.drop-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 36px 24px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
    outline: none;
}

.drop-zone:hover,
.drop-zone:focus,
.drop-zone.drag-over {
    border-color: var(--accent);
    background: rgba(88, 166, 255, 0.04);
}

.drop-prompt strong {
    display: block;
    font-size: 16px;
    margin-bottom: 4px;
}

.drop-prompt span {
    display: block;
    color: var(--fg-muted);
    font-size: 13px;
    margin-bottom: 16px;
}

.drop-hint {
    color: var(--fg-muted);
    font-size: 12px;
    margin: 0;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

.drop-meta {
    margin-top: 12px;
    padding: 10px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 13px;
    color: var(--fg-muted);
}

.drop-meta strong {
    color: var(--fg);
}

/* ─── Status ────────────────────────────────────────────────────────────── */
.status-card .status-row {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 6px 0;
    font-size: 13px;
}

.status-card .status-row + .status-row {
    border-top: 1px solid var(--border);
}

.status-card .status-icon {
    flex-shrink: 0;
    width: 18px;
    text-align: center;
    font-weight: 700;
}

.status-icon.ok       { color: var(--success); }
.status-icon.warn     { color: var(--warn); }
.status-icon.err      { color: var(--error); }
.status-icon.info     { color: var(--accent); }

.status-card .status-row code {
    word-break: break-all;
}

.status-card .summary {
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
    color: var(--fg-muted);
}

.status-card .summary strong {
    color: var(--fg);
}

/* ─── Action ────────────────────────────────────────────────────────────── */
.action-card {
    text-align: center;
}

#downloadBtn {
    background: var(--accent);
    color: var(--accent-fg);
    border: none;
    padding: 12px 28px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background 0.15s, opacity 0.15s;
    font-family: inherit;
}

#downloadBtn:hover:not(:disabled) {
    background: #79b8ff;
}

#downloadBtn:disabled {
    background: var(--bg-input);
    color: var(--fg-muted);
    cursor: not-allowed;
    border: 1px solid var(--border);
}

.action-hint {
    color: var(--fg-muted);
    font-size: 12px;
    margin: 12px 0 0;
}

/* ─── Help ──────────────────────────────────────────────────────────────── */
.help-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0;
    margin-bottom: var(--gap);
}

.help-card summary {
    padding: 14px 20px;
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    list-style: none;
    color: var(--fg);
}

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

.help-card summary::before {
    content: "▸ ";
    color: var(--fg-muted);
    font-size: 12px;
    margin-right: 4px;
}

.help-card[open] summary::before {
    content: "▾ ";
}

.help-body {
    padding: 0 20px 18px;
    color: var(--fg-muted);
    font-size: 13px;
}

.help-body p {
    margin: 12px 0;
}

.help-body strong {
    color: var(--fg);
}

.help-meta {
    font-size: 12px;
    border-top: 1px solid var(--border);
    padding-top: 12px;
    margin-top: 18px;
}

/* ─── Footer ────────────────────────────────────────────────────────────── */
footer {
    margin-top: 40px;
    margin-bottom: 32px;
    padding-top: 18px;
    border-top: 1px solid var(--border);
    color: var(--fg-muted);
    font-size: 12px;
    text-align: center;
}

footer p { margin: 0; }

/* ─── Responsive tweaks ─────────────────────────────────────────────────── */
@media (max-width: 600px) {
    header, main, footer { padding-left: 16px; padding-right: 16px; }
    header { padding-top: 24px; }
    header h1 { font-size: 22px; }
    section { padding: 16px; }
}