:root {
    --bg: #0f0f10;
    --surface: #1a1a1d;
    --surface-2: #232327;
    --border: #2e2e34;
    --border-strong: #3d3d45;
    --text: #f0f0f3;
    --text-muted: #9a9aa2;
    --accent: #ff5252;
    --accent-hover: #ff7070;
    --accent-text: #1a0606;
    --success: #4caf50;
    --error: #ef5350;
    --radius: 8px;
    --radius-sm: 4px;
    --space: 16px;
}

* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 24px 16px;
    line-height: 1.5;
    font-size: 15px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
}

.muted {
    color: var(--text-muted);
    font-weight: 400;
}

.hint {
    color: var(--text-muted);
    font-size: 14px;
    margin: 0 0 16px;
}

.hint-kbd {
    background: var(--surface-2);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    padding: 4px 8px;
    font-size: 12px;
    color: var(--text-muted);
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.header h1 {
    font-size: 22px;
    margin: 0;
    font-weight: 600;
}

.operator-switcher {
    display: flex;
    align-items: center;
    gap: 8px;
}

.operator-switcher label {
    font-size: 14px;
    color: var(--text-muted);
    margin: 0;
}

.operator-switcher select {
    margin: 0;
    width: auto;
    min-width: 220px;
}

.panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 20px;
}

.panel h2 {
    margin: 0 0 16px;
    font-size: 17px;
    font-weight: 600;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 16px;
}

.panel-header h2 {
    margin: 0;
}

.panel-controls {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}

.panel-controls input {
    margin: 0;
    width: auto;
    min-width: 200px;
}

.panel-controls button {
    margin: 0;
}

.status {
    color: var(--text-muted);
    font-size: 13px;
    margin-bottom: 12px;
    min-height: 18px;
}

.status[data-type="error"] {
    color: var(--error);
}

button,
.btn-link {
    background: var(--accent);
    color: var(--accent-text);
    border: none;
    padding: 10px 16px;
    cursor: pointer;
    border-radius: var(--radius-sm);
    text-decoration: none;
    display: inline-block;
    font-size: 14px;
    font-weight: 600;
    font-family: inherit;
    transition: background 0.15s;
}

button:hover,
.btn-link:hover {
    background: var(--accent-hover);
}

button:focus-visible,
.btn-link:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--surface-2);
    color: var(--text);
    border: 1px solid var(--border-strong);
}

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

input,
select,
textarea {
    width: 100%;
    padding: 10px 12px;
    margin-top: 4px;
    margin-bottom: 14px;
    background: var(--surface-2);
    border: 1px solid var(--border-strong);
    color: var(--text);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 14px;
}

textarea {
    resize: vertical;
    line-height: 1.45;
}

label {
    display: block;
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 8px;
    font-weight: 500;
}

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

.hidden {
    display: none !important;
}

.book-select-row {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 8px;
    align-items: start;
    margin-bottom: 14px;
}

.book-select-row select {
    margin: 0;
}

.book-select-row button {
    margin: 0;
    white-space: nowrap;
    padding: 10px 14px;
}

.result-section-heading {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 24px 0 10px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--border);
}

.result-section-heading:first-of-type {
    margin-top: 8px;
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px 16px;
}

.result-field {
    display: grid;
    grid-template-columns: 1fr auto;
    column-gap: 8px;
    align-items: end;
}

.result-field label {
    grid-column: 1 / -1;
    margin-top: 0;
}

.result-field textarea {
    margin-bottom: 0;
}

.result-field button {
    margin-bottom: 0;
    padding: 8px 12px;
    font-size: 13px;
}

.result-field--full {
    grid-column: 1 / -1;
}

.result-field--full textarea {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 13px;
}

.result-actions {
    margin-top: 18px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.footer {
    margin-top: 32px;
    padding: 16px 0;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 12px;
    text-align: center;
    line-height: 1.5;
}

.footer code {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    background: var(--surface-2);
    padding: 1px 6px;
    border-radius: 3px;
    font-size: 11px;
    color: var(--text);
}

.footer .footer-stale {
    color: var(--error);
}

.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(80px);
    background: var(--surface-2);
    border: 1px solid var(--border-strong);
    color: var(--text);
    padding: 12px 20px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    pointer-events: none;
    opacity: 0;
    transition: transform 0.2s, opacity 0.2s;
    z-index: 1000;
    max-width: 90vw;
}

.toast.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast[data-type="success"] {
    border-color: var(--success);
}

.toast[data-type="error"] {
    border-color: var(--error);
}

@media (max-width: 720px) {
    body {
        padding: 16px 12px;
    }

    .header {
        flex-direction: column;
        align-items: flex-start;
    }

    .result-grid {
        grid-template-columns: 1fr;
    }

    .book-select-row {
        grid-template-columns: 1fr;
    }
}