:root {
    --bg: #f5f6f8;
    --pane-bg: #ffffff;
    --border: #e3e6eb;
    --border-strong: #c8cdd4;
    --text: #1f2430;
    --text-muted: #6b7280;
    --accent: #2960d8;
    --accent-hover: #1f4cb6;
    --danger: #c8362a;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --radius: 6px;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 14px;
    line-height: 1.4;
}

button { font-family: inherit; }

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 24px;
    background: var(--pane-bg);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.topbar h1 {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.topbar-actions { display: flex; gap: 8px; }

.layout {
    display: grid;
    grid-template-columns: minmax(420px, 40%) 1fr;
    gap: 0;
    height: calc(100vh - 57px);
}

.form-pane {
    overflow-y: auto;
    padding: 20px 24px 60px;
    background: var(--pane-bg);
    border-right: 1px solid var(--border);
}

.form-section { margin-bottom: 28px; }

.section-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.form-section h2 {
    margin: 0 0 12px;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.section-head h2 { margin-bottom: 0; }

.count-badge {
    display: inline-block;
    margin-left: 6px;
    font-size: 11px;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: none;
    letter-spacing: 0;
}

.campaign-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.field-label {
    font-size: 12px;
    color: var(--text-muted);
}

.field-label code {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 3px;
    padding: 0 4px;
    font-size: 10px;
}

.btn:disabled,
.btn-link:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.bulk-textarea {
    font-family: 'SFMono-Regular', Menlo, monospace;
    font-size: 12px;
    line-height: 1.5;
    resize: vertical;
    min-height: 120px;
}

.bulk-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 8px;
}

.bulk-status {
    font-size: 12px;
    color: var(--text-muted);
}
.bulk-status.error { color: var(--danger); }
.bulk-status.ok { color: #1a8754; }

.input,
.textarea {
    width: 100%;
    padding: 8px 10px;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    background: #fff;
    font-size: 14px;
    font-family: inherit;
    color: var(--text);
    transition: border-color 0.15s, box-shadow 0.15s;
}

.input:focus,
.textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(41, 96, 216, 0.15);
}

/* Questions list */
.questions-list { display: flex; flex-direction: column; gap: 14px; }

.question-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px;
    background: #fafbfc;
}

.question-card-head {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.question-index {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 2px 8px;
    min-width: 28px;
    text-align: center;
}

.question-card-head .input { flex: 1; }

.question-options {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 10px;
    font-size: 13px;
    color: var(--text-muted);
}

.question-options label {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
}

.answers-list { display: flex; flex-direction: column; gap: 6px; margin-bottom: 8px; }

.answer-row {
    display: flex;
    gap: 6px;
    align-items: center;
}

.answer-row .input { flex: 1; }

.icon-btn {
    width: 30px;
    height: 30px;
    border: 1px solid var(--border-strong);
    background: #fff;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 16px;
    line-height: 1;
    padding: 0;
}

.icon-btn:hover { border-color: var(--danger); color: var(--danger); }

.question-card-footer {
    display: flex;
    justify-content: space-between;
    gap: 8px;
}

/* Colors */
.colors-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.color-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 8px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: #fafbfc;
}

.color-row input[type="color"] {
    width: 32px;
    height: 28px;
    border: 1px solid var(--border-strong);
    border-radius: 4px;
    padding: 0;
    cursor: pointer;
    background: #fff;
}

.color-row .color-label {
    font-size: 11px;
    color: var(--text-muted);
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.color-row .hex {
    width: 78px;
    padding: 4px 6px;
    font-family: 'SFMono-Regular', Menlo, monospace;
    font-size: 12px;
    border: 1px solid var(--border-strong);
    border-radius: 4px;
    background: #fff;
    text-transform: uppercase;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 14px;
    border: 1px solid transparent;
    border-radius: var(--radius);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
    text-decoration: none;
}

.btn-sm { padding: 5px 10px; font-size: 12px; }

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

.btn-secondary {
    background: var(--text);
    color: #fff;
}
.btn-secondary:hover { background: #000; }

.btn-ghost {
    background: transparent;
    color: var(--text);
    border-color: var(--border-strong);
}
.btn-ghost:hover { background: #f0f2f5; }

.btn-link {
    background: transparent;
    color: var(--accent);
    padding: 4px 6px;
    font-size: 12px;
}
.btn-link:hover { text-decoration: underline; }

.btn-danger-link {
    background: transparent;
    color: var(--danger);
    padding: 4px 6px;
    font-size: 12px;
}
.btn-danger-link:hover { text-decoration: underline; }

/* Download grid */
.download-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 8px;
}

.download-all { width: 100%; margin-top: 4px; }

.hint {
    font-size: 12px;
    color: var(--text-muted);
    margin: 8px 0 0;
}

/* Preview pane */
.preview-pane {
    overflow-y: auto;
    background: var(--bg);
    display: flex;
    flex-direction: column;
}

.preview-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    border-bottom: 1px solid var(--border);
    background: var(--pane-bg);
    position: sticky;
    top: 0;
    z-index: 5;
}

.preview-label {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.preview-status {
    font-size: 12px;
    color: var(--text-muted);
    font-family: 'SFMono-Regular', Menlo, monospace;
}
.preview-status.rendering { color: var(--accent); }
.preview-status.ok { color: #1a8754; }

.preview-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    padding: 24px;
    align-content: flex-start;
}

.preview-cell {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.preview-cell-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    font-family: 'SFMono-Regular', Menlo, monospace;
}

.preview-frame-wrap {
    border: 1px solid var(--border);
    background: #fff;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.preview-frame {
    width: 100%;
    height: 100%;
    border: 0;
    display: block;
}

.preview-footnote {
    margin: 0;
    padding: 12px 24px 24px;
    font-size: 12px;
    color: var(--text-muted);
}

.preview-footnote code {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 3px;
    padding: 1px 5px;
    font-size: 11px;
}

@media (max-width: 1100px) {
    .layout { grid-template-columns: 1fr; height: auto; }
    .form-pane { border-right: 0; border-bottom: 1px solid var(--border); max-height: 60vh; }
}