@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;600&family=IBM+Plex+Sans:wght@300;400;600&display=swap");

/* ── Colour tokens (dark theme — default) ──────────────── */

:root {
    --bg-page: #0e0e10;
    --bg-card: #16161a;
    --bg-input: #0e0e10;
    --bg-editor: #0e0e10;
    --bg-preview: #0c0c0f;
    --bg-result: #0e0e10;
    --bg-skeleton-a: #111;
    --bg-skeleton-b: #1a1a1e;

    --border-subtle: #2a2a2e;
    --border-input: #333;
    --border-divider: #1e1e22;
    --border-editor: #1a1a1e;

    --text-primary: #e8e8e8;
    --text-heading: #f0f0f0;
    --text-subtitle: #666;
    --text-label: #888;
    --text-muted: #555;
    --text-dim: #444;
    --text-verydim: #333;
    --text-editor: #c8d0d8;

    --accent: #4a9eff;
    --accent-bg: #4a9eff18;
    --accent-border: #4a9eff55;
    --accent-bg-hover: #4a9eff28;

    --error-text: #e85555;
    --error-bg: #2e1a1a;
    --error-border: #5a2020;
    --error-status-bg: #1e1010;

    --tag-steel-bg: #1a2a3a;
    --tag-steel-fg: #4a9eff;
    --tag-stainless-bg: #1a2e24;
    --tag-stainless-fg: #4adb8a;
    --tag-nylon-bg: #2e2418;
    --tag-nylon-fg: #e8a24a;

    --shadow: rgba(0, 0, 0, 0.5);
    --modal-overlay: rgba(0, 0, 0, 0.7);
    --modal-shadow: rgba(0, 0, 0, 0.6);

    --select-arrow: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23666' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
}

/* ── Colour tokens (light theme) ───────────────────────── */

@media (prefers-color-scheme: light) {
    :root {
        --bg-page: #f4f4f6;
        --bg-card: #ffffff;
        --bg-input: #f9f9fb;
        --bg-editor: #f9f9fb;
        --bg-preview: #f0f0f3;
        --bg-result: #f9f9fb;
        --bg-skeleton-a: #e8e8ec;
        --bg-skeleton-b: #d8d8de;

        --border-subtle: #dcdce0;
        --border-input: #c8c8cc;
        --border-divider: #e4e4e8;
        --border-editor: #dcdce0;

        --text-primary: #1a1a1e;
        --text-heading: #0e0e10;
        --text-subtitle: #888;
        --text-label: #666;
        --text-muted: #888;
        --text-dim: #999;
        --text-verydim: #bbb;
        --text-editor: #2a2a3a;

        --accent: #1a6fd4;
        --accent-bg: #1a6fd418;
        --accent-border: #1a6fd455;
        --accent-bg-hover: #1a6fd428;

        --error-text: #cc2222;
        --error-bg: #fff0f0;
        --error-border: #e8aaaa;
        --error-status-bg: #fff5f5;

        --tag-steel-bg: #ddeeff;
        --tag-steel-fg: #1a5fa8;
        --tag-stainless-bg: #d8f5e8;
        --tag-stainless-fg: #1a7a44;
        --tag-nylon-bg: #fff3dd;
        --tag-nylon-fg: #a05a00;

        --shadow: rgba(0, 0, 0, 0.1);
        --modal-overlay: rgba(0, 0, 0, 0.4);
        --modal-shadow: rgba(0, 0, 0, 0.2);

        --select-arrow: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23999' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    }
}

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background: var(--bg-page);
    color: var(--text-primary);
    font-family: "IBM Plex Sans", sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px 16px;
}

/* ── Header ────────────────────────────────────────────── */

.header {
    text-align: center;
    margin-bottom: 32px;
    position: relative;
}

.header h1 {
    font-family: "IBM Plex Mono", monospace;
    font-size: clamp(1.2rem, 4vw, 1.8rem);
    font-weight: 600;
    letter-spacing: 0.12em;
    color: var(--text-heading);
    text-transform: uppercase;
}

.header p {
    font-size: 0.82rem;
    color: var(--text-subtitle);
    margin-top: 6px;
    letter-spacing: 0.06em;
    font-family: "IBM Plex Mono", monospace;
}

/* ── Card ──────────────────────────────────────────────── */

.form-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    padding: 32px 28px;
    width: 100%;
    max-width: 520px;
    box-shadow: 0 8px 48px var(--shadow);
}

/* ── Fields ────────────────────────────────────────────── */

.field-group {
    margin-bottom: 22px;
}

.field-group label {
    display: block;
    font-size: 0.72rem;
    font-family: "IBM Plex Mono", monospace;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-label);
    margin-bottom: 8px;
}

select {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border-input);
    color: var(--text-primary);
    font-family: "IBM Plex Sans", sans-serif;
    font-size: 0.95rem;
    padding: 10px 14px;
    border-radius: 3px;
    appearance: none;
    background-image: var(--select-arrow);
    background-repeat: no-repeat;
    background-position: right 14px center;
    cursor: pointer;
    transition: border-color 0.15s;
}

select:focus {
    outline: none;
    border-color: var(--accent);
}

select:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

/* ── Number input ──────────────────────────────────────── */

.number-input-wrap {
    display: flex;
    align-items: center;
    background: #0e0e10;
    border: 1px solid #333;
    border-radius: 3px;
    transition: border-color 0.15s;
}

.number-input-wrap:focus-within {
    border-color: #4a9eff;
}

.number-input-wrap input[type="number"] {
    flex: 1;
    min-width: 0;
    background: transparent;
    border: none;
    color: #e8e8e8;
    font-family: "IBM Plex Sans", sans-serif;
    font-size: 0.95rem;
    padding: 10px 14px;
    outline: none;
    -moz-appearance: textfield;
}

.number-input-wrap input[type="number"]::-webkit-outer-spin-button,
.number-input-wrap input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.number-unit {
    padding: 0 14px 0 4px;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.82rem;
    color: #555;
    pointer-events: none;
    white-space: nowrap;
}

/* ── Divider ───────────────────────────────────────────── */

.divider {
    border: none;
    border-top: 1px solid var(--border-subtle);
    margin: 28px 0;
}

/* ── Results panel ─────────────────────────────────────── */

#results-panel {
    background: var(--bg-result);
    border: 1px solid var(--border-subtle);
    border-left: 3px solid var(--accent);
    border-radius: 3px;
    padding: 18px 20px;
}

.result-placeholder {
    font-family: "IBM Plex Mono", monospace;
    font-size: 1.6rem;
    font-weight: 600;
    color: var(--text-verydim);
}

/* ── Individual result card ────────────────────────────── */

.result-card + .result-card {
    border-top: 1px solid var(--border-divider);
    margin-top: 18px;
    padding-top: 18px;
}

.result-card-label {
    font-size: 0.7rem;
    font-family: "IBM Plex Mono", monospace;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 8px;
}

.result-card-value {
    font-family: "IBM Plex Mono", monospace;
    font-size: 1.6rem;
    font-weight: 600;
    color: var(--text-heading);
}

.result-card-value--placeholder {
    color: var(--text-verydim);
}

.result-card-unit {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 4px;
    font-family: "IBM Plex Mono", monospace;
}

.result-card-formula {
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px solid var(--border-divider);
    color: var(--text-label);
    /* KaTeX display blocks are centred by default — keep that behaviour */
    overflow-x: auto;
}

/* Plain formula fallback (cosmetic substitution, no KaTeX) */
.result-card-formula .formula-plain {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.72rem;
    letter-spacing: 0.03em;
    color: var(--text-muted);
}

/* KaTeX overrides: fit the current theme */
.result-card-formula .katex {
    color: var(--text-primary);
    font-size: 1rem;
}

/* Error state for bad LaTeX / AsciiMath */
.result-card-formula .formula-error {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.7rem;
    color: var(--error-text);
    letter-spacing: 0.03em;
}

/* ── Material tags ─────────────────────────────────────── */

.tag {
    display: inline-block;
    font-size: 0.65rem;
    font-family: "IBM Plex Mono", monospace;
    padding: 2px 7px;
    border-radius: 2px;
    margin-left: 6px;
    vertical-align: middle;
}

.tag-steel {
    background: var(--tag-steel-bg);
    color: var(--tag-steel-fg);
}
.tag-stainless {
    background: var(--tag-stainless-bg);
    color: var(--tag-stainless-fg);
}
.tag-nylon {
    background: var(--tag-nylon-bg);
    color: var(--tag-nylon-fg);
}

/* ── Responsive ────────────────────────────────────────── */

@media (max-width: 480px) {
    .form-card {
        padding: 22px 16px;
    }
}

/* ── Reload button ─────────────────────────────────────── */

.reload-btn {
    display: block;
    width: 100%;
    margin-top: 20px;
    padding: 8px 0;
    background: transparent;
    border: 1px solid var(--border-subtle);
    border-radius: 3px;
    color: var(--text-muted);
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    cursor: pointer;
    transition:
        border-color 0.15s,
        color 0.15s;
}

.reload-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* ── Error banner ──────────────────────────────────────── */

.error-banner {
    background: var(--error-bg);
    border: 1px solid var(--error-border);
    border-left: 3px solid var(--error-text);
    border-radius: 3px;
    padding: 14px 18px;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.75rem;
    color: var(--error-text);
    line-height: 1.6;
    margin-bottom: 22px;
}

/* ── Tabs bar ──────────────────────────────────────────── */

.tabs-bar {
    display: flex;
    align-items: flex-end;
    gap: 4px;
    margin-bottom: -1px;   /* merge with form-card top border */
    overflow-x: auto;
    padding-bottom: 0;
}

.tab {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    background: transparent;
    border: 1px solid var(--border-subtle);
    border-radius: 3px 3px 0 0;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.68rem;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    cursor: pointer;
    white-space: nowrap;
    transition: border-color 0.15s, color 0.15s, background 0.15s;
}

.tab:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.tab--active {
    border-color: var(--accent);
    border-bottom-color: var(--card-bg, var(--bg));
    color: var(--accent);
    background: var(--accent-bg);
}

.tab-close {
    font-size: 0.8rem;
    line-height: 1;
    color: var(--text-muted);
    opacity: 0.6;
}

.tab-close:hover {
    opacity: 1;
    color: var(--error-text, #e06c6c);
}

.tab-add {
    padding: 5px 10px;
    font-size: 0.9rem;
}

/* ── Info banner ───────────────────────────────────────── */

.info-banner {
    background: var(--accent-bg);
    border: 1px solid var(--accent-border);
    border-left: 3px solid var(--accent);
    border-radius: 3px;
    padding: 10px 16px;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.72rem;
    color: var(--accent);
    line-height: 1.5;
    margin-bottom: 16px;
}

/* ── Share tooltip ─────────────────────────────────────── */

.share-tooltip {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--accent);
    color: #fff;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.68rem;
    letter-spacing: 0.08em;
    padding: 3px 10px;
    border-radius: 3px;
    pointer-events: none;
    white-space: nowrap;
}

/* ── Back link (tool page) ─────────────────────────────── */

.back-link {
    display: inline-block;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    text-decoration: none;
    margin-bottom: 16px;
    cursor: pointer;
    transition: color 0.15s;
}

.back-link:hover {
    color: var(--accent);
}

/* ── History toggle button (header, top-right) ─────────── */

.history-toggle-btn {
    position: absolute;
    top: 0;
    right: 0;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 11px 5px 9px;
    background: transparent;
    border: 1px solid var(--border-subtle);
    border-radius: 20px;
    color: var(--text-muted);
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.68rem;
    letter-spacing: 0.06em;
    cursor: pointer;
    transition:
        border-color 0.15s,
        color 0.15s,
        background 0.15s;
}

.history-toggle-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.history-toggle-btn.history-btn--active {
    background: var(--accent-bg);
    border-color: var(--accent-border);
    color: var(--accent);
}

.history-toggle-glyph {
    font-size: 0.85rem;
    line-height: 1;
}

.history-toggle-label {
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* ── Listing card ──────────────────────────────────────── */

.listing-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    padding: 28px 28px;
    width: 100%;
    max-width: 680px;
    box-shadow: 0 8px 48px var(--shadow);
}

/* ── Toolbar (search + new button) ────────────────────── */

.listing-toolbar {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.search-input {
    flex: 1;
    background: var(--bg-input);
    border: 1px solid var(--border-input);
    color: var(--text-primary);
    font-family: "IBM Plex Sans", sans-serif;
    font-size: 0.9rem;
    padding: 9px 14px;
    border-radius: 3px;
    transition: border-color 0.15s;
}

.search-input::placeholder {
    color: var(--text-dim);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent);
}

.new-tool-btn {
    background: transparent;
    border: 1px solid var(--border-subtle);
    border-radius: 3px;
    color: var(--text-label);
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    padding: 9px 16px;
    cursor: pointer;
    white-space: nowrap;
    transition:
        border-color 0.15s,
        color 0.15s;
}

.new-tool-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* ── Tool cards ────────────────────────────────────────── */

.tool-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border-subtle);
    border-radius: 3px;
    margin-bottom: 8px;
    text-decoration: none;
    color: inherit;
    transition:
        border-color 0.15s,
        background 0.15s;
    cursor: pointer;
}

.tool-card:last-child {
    margin-bottom: 0;
}

.tool-card:hover {
    border-color: var(--accent);
    background: var(--bg-card);
}

.tool-card-id {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.68rem;
    color: var(--text-dim);
    min-width: 28px;
}

.tool-card-name {
    flex: 1;
    font-size: 0.92rem;
    color: var(--text-primary);
    font-family: "IBM Plex Sans", sans-serif;
    text-decoration: none;
    transition: color 0.15s;
}

.tool-card-name:hover {
    color: var(--text-heading);
}

.tool-card-actions {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-shrink: 0;
}

.tool-card-edit {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.68rem;
    letter-spacing: 0.06em;
    color: var(--text-dim);
    text-decoration: none;
    transition: color 0.15s;
}

.tool-card-edit:hover {
    color: var(--accent);
}

.tool-card-arrow {
    font-size: 0.85rem;
    color: var(--text-verydim);
    text-decoration: none;
    transition:
        color 0.15s,
        transform 0.15s;
}

.tool-card:hover .tool-card-arrow {
    color: var(--accent);
    transform: translateX(3px);
}

/* ── Skeleton loader ───────────────────────────────────── */

.tool-card--skeleton {
    height: 48px;
    background: linear-gradient(
        90deg,
        var(--bg-skeleton-a) 25%,
        var(--bg-skeleton-b) 50%,
        var(--bg-skeleton-a) 75%
    );
    background-size: 200% 100%;
    animation: skeleton-sweep 1.4s ease infinite;
    border-color: var(--bg-skeleton-b);
    cursor: default;
    pointer-events: none;
}

.tool-card--skeleton:hover {
    border-color: var(--bg-skeleton-b);
    background: linear-gradient(
        90deg,
        var(--bg-skeleton-a) 25%,
        var(--bg-skeleton-b) 50%,
        var(--bg-skeleton-a) 75%
    );
    background-size: 200% 100%;
}

@keyframes skeleton-sweep {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* ── Empty state ───────────────────────────────────────── */

.listing-empty {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.78rem;
    color: var(--text-dim);
    text-align: center;
    padding: 32px 0;
    letter-spacing: 0.06em;
}

/* ── Modal ─────────────────────────────────────────────── */

.modal-overlay {
    position: fixed;
    inset: 0;
    background: var(--modal-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 16px;
}

.modal-dialog {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    padding: 28px 28px 24px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 16px 64px var(--modal-shadow);
}

.modal-title {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-heading);
    margin-bottom: 22px;
}

.modal-label {
    display: block;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-label);
    margin-bottom: 8px;
}

.modal-input {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border-input);
    color: var(--text-primary);
    font-family: "IBM Plex Sans", sans-serif;
    font-size: 0.95rem;
    padding: 10px 14px;
    border-radius: 3px;
    transition: border-color 0.15s;
}

.modal-input:focus {
    outline: none;
    border-color: var(--accent);
}

.modal-error {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.72rem;
    color: var(--error-text);
    margin-top: 8px;
    min-height: 1em;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 22px;
}

.modal-btn {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 9px 18px;
    border-radius: 3px;
    cursor: pointer;
    transition:
        border-color 0.15s,
        color 0.15s,
        background 0.15s;
}

.modal-btn--cancel {
    background: transparent;
    border: 1px solid var(--border-subtle);
    color: var(--text-muted);
}

.modal-btn--cancel:hover {
    border-color: var(--text-muted);
    color: var(--text-label);
}

.modal-btn--confirm {
    background: var(--accent-bg);
    border: 1px solid var(--accent-border);
    color: var(--accent);
}

.modal-btn--confirm:hover {
    background: var(--accent-bg-hover);
    border-color: var(--accent);
}

.modal-btn--confirm:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* ── Editor page layout ────────────────────────────────── */

body.editor-page {
    justify-content: flex-start;
    align-items: stretch;
    padding: 0;
    height: 100vh;
    overflow: hidden;
    background: var(--bg-page);
}

.editor-layout {
    display: flex;
    flex-direction: row;
    width: 100%;
    height: 100vh;
    overflow: hidden;
}

/* ── Editor pane (left) ────────────────────────────────── */

.editor-pane {
    display: flex;
    flex-direction: column;
    width: 45%;
    min-width: 320px;
    border-right: 1px solid var(--border-subtle);
    background: var(--bg-editor);
}

.editor-pane-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    border-bottom: 1px solid var(--border-subtle);
    gap: 12px;
    flex-shrink: 0;
}

.editor-pane-title {
    display: flex;
    flex-direction: column;
    gap: 4px;
    overflow: hidden;
}

.editor-tool-name {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.06em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.editor-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

/* ── YAML textarea ─────────────────────────────────────── */

.yaml-editor {
    flex: 1;
    resize: none;
    background: var(--bg-editor);
    color: var(--text-editor);
    border: none;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.82rem;
    line-height: 1.7;
    padding: 20px;
    outline: none;
    overflow-y: auto;
    tab-size: 2;
}

.yaml-editor::placeholder {
    color: var(--text-verydim);
}

/* ── Editor status bar ─────────────────────────────────── */

.editor-status {
    flex-shrink: 0;
    min-height: 28px;
    padding: 5px 20px;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.7rem;
    letter-spacing: 0.04em;
    border-top: 1px solid var(--border-editor);
    white-space: pre-wrap;
    word-break: break-word;
    line-height: 1.5;
}

.editor-status--error {
    color: var(--error-text);
    background: var(--error-status-bg);
}

.editor-status--dirty {
    color: var(--text-dim);
}

.editor-status--ok {
    color: var(--text-dim);
}

/* ── Save button ───────────────────────────────────────── */

.save-btn {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 8px 20px;
    border-radius: 3px;
    cursor: pointer;
    background: transparent;
    border: 1px solid var(--border-subtle);
    color: var(--text-muted);
    transition:
        background 0.15s,
        border-color 0.15s,
        color 0.15s;
}

.save-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.save-btn--dirty {
    background: var(--accent-bg);
    border-color: var(--accent-border);
    color: var(--accent);
}

.save-btn--dirty:hover {
    background: var(--accent-bg-hover);
    border-color: var(--accent);
}

/* ── Preview pane (right) ──────────────────────────────── */

.preview-pane {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-preview);
    overflow: hidden;
}

.preview-pane-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    border-bottom: 1px solid var(--border-subtle);
    flex-shrink: 0;
}

.preview-pane-label {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-dim);
}

.view-tool-link {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.68rem;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.15s;
}

.view-tool-link:hover {
    color: var(--accent);
}

.preview-scroll {
    flex: 1;
    overflow-y: auto;
    padding: 40px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.preview-header {
    width: 100%;
    max-width: 520px;
    margin-bottom: 32px;
}

.preview-card {
    width: 100%;
    max-width: 520px;
}

/* ── Editor responsive ─────────────────────────────────── */

@media (max-width: 768px) {
    body.editor-page {
        height: auto;
        overflow: auto;
    }

    .editor-layout {
        flex-direction: column;
        height: auto;
    }

    .editor-pane {
        width: 100%;
        min-width: 0;
        border-right: none;
        border-bottom: 1px solid var(--border-subtle);
        height: 50vh;
    }

    .preview-pane {
        height: auto;
    }

    .preview-scroll {
        padding: 24px 16px;
    }
}

/* ── Help button ───────────────────────────────────────── */

.help-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    background: transparent;
    border: 1px solid var(--border-subtle);
    border-radius: 3px;
    text-decoration: none;
    flex-shrink: 0;
    transition:
        border-color 0.15s,
        color 0.15s;
}

.help-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* ── Help page layout ──────────────────────────────────── */

body.help-page {
    justify-content: flex-start;
    align-items: center;
    padding: 32px 16px 64px;
}

.help-topbar {
    width: 100%;
    max-width: 780px;
    margin-bottom: 16px;
}

.help-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    padding: 48px 56px;
    width: 100%;
    max-width: 780px;
    box-shadow: 0 8px 48px var(--shadow);
}

.help-loading {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.78rem;
    color: var(--text-dim);
    text-align: center;
    padding: 48px 0;
    letter-spacing: 0.06em;
}

@media (max-width: 600px) {
    .help-card {
        padding: 28px 20px;
    }
}

/* ── Markdown content ──────────────────────────────────── */

.help-content h1 {
    font-family: "IBM Plex Mono", monospace;
    font-size: 1.3rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-heading);
    margin-bottom: 24px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border-subtle);
}

.help-content h2 {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent);
    margin-top: 48px;
    margin-bottom: 16px;
}

.help-content h3 {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-primary);
    margin-top: 32px;
    margin-bottom: 12px;
}

.help-content h4 {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--text-label);
    margin-top: 24px;
    margin-bottom: 10px;
}

.help-content p {
    font-size: 0.92rem;
    line-height: 1.75;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.help-content ul,
.help-content ol {
    padding-left: 24px;
    margin-bottom: 16px;
}

.help-content li {
    font-size: 0.92rem;
    line-height: 1.75;
    color: var(--text-primary);
    margin-bottom: 4px;
}

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

.help-content a:hover {
    text-decoration: underline;
}

.help-content hr {
    border: none;
    border-top: 1px solid var(--border-subtle);
    margin: 36px 0;
}

.help-content code {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.8rem;
    background: var(--bg-input);
    border: 1px solid var(--border-subtle);
    border-radius: 3px;
    padding: 1px 6px;
    color: var(--accent);
}

.help-content pre {
    background: var(--bg-editor);
    border: 1px solid var(--border-editor);
    border-left: 3px solid var(--accent-border);
    border-radius: 3px;
    padding: 18px 20px;
    overflow-x: auto;
    margin-bottom: 20px;
}

.help-content pre code {
    background: none;
    border: none;
    padding: 0;
    color: var(--text-editor);
    font-size: 0.78rem;
    line-height: 1.7;
}

.help-content table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
    margin-bottom: 20px;
}

.help-content th {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-label);
    text-align: left;
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-subtle);
}

.help-content td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-divider);
    color: var(--text-primary);
    vertical-align: top;
    line-height: 1.55;
}

.help-content td code {
    font-size: 0.75rem;
}

.help-content tr:last-child td {
    border-bottom: none;
}

/* ── Auth bar (index header) ───────────────────────────── */

.auth-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-top: 10px;
    min-height: 24px;
}

.auth-bar-username {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.7rem;
    color: var(--text-muted);
    letter-spacing: 0.06em;
}

.auth-bar-btn {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.68rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 5px 12px;
    border-radius: 3px;
    cursor: pointer;
    background: transparent;
    border: 1px solid var(--border-subtle);
    color: var(--text-muted);
    transition:
        border-color 0.15s,
        color 0.15s;
    text-decoration: none;
}

.auth-bar-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* ── Auth card ─────────────────────────────────────────── */

.auth-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 8px 48px var(--shadow);
    overflow: hidden;
}

/* ── Auth tabs ─────────────────────────────────────────── */

.auth-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-subtle);
}

.auth-tab {
    flex: 1;
    padding: 14px 0;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition:
        color 0.15s,
        border-color 0.15s;
    margin-bottom: -1px;
}

.auth-tab:hover {
    color: var(--text-primary);
}

.auth-tab--active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

/* ── Auth panels ───────────────────────────────────────── */

.auth-panel {
    padding: 28px 28px 24px;
}

.auth-panel--hidden {
    display: none;
}

.auth-input {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border-input);
    color: var(--text-primary);
    font-family: "IBM Plex Sans", sans-serif;
    font-size: 0.95rem;
    padding: 10px 14px;
    border-radius: 3px;
    transition: border-color 0.15s;
}

.auth-input:focus {
    outline: none;
    border-color: var(--accent);
}

.auth-error {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.72rem;
    color: var(--error-text);
    margin-top: 8px;
    min-height: 1em;
}

.auth-submit-btn {
    display: block;
    width: 100%;
    margin-top: 22px;
    padding: 11px 0;
    background: var(--accent-bg);
    border: 1px solid var(--accent-border);
    border-radius: 3px;
    color: var(--accent);
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    cursor: pointer;
    transition:
        background 0.15s,
        border-color 0.15s;
}

.auth-submit-btn:hover {
    background: var(--accent-bg-hover);
    border-color: var(--accent);
}

.auth-submit-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* ── Editor username ───────────────────────────────────── */

.editor-username {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.68rem;
    color: var(--text-dim);
    letter-spacing: 0.06em;
}

/* ── Permissions panel ─────────────────────────────────── */

.permissions-panel {
    flex-shrink: 0;
    border-top: 1px solid var(--border-editor);
    padding: 14px 20px 12px;
    background: var(--bg-editor);
}

.permissions-panel-title {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.65rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 12px;
}

.permissions-grid {
    display: grid;
    grid-template-columns: auto 1fr 1fr;
    align-items: center;
    gap: 8px 16px;
}

.permissions-col-label {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.62rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-dim);
    text-align: center;
}

.permissions-row-label {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.68rem;
    letter-spacing: 0.06em;
    color: var(--text-muted);
}

.permissions-status {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.65rem;
    letter-spacing: 0.04em;
    min-height: 1em;
    margin-top: 10px;
}

.permissions-status--saving {
    color: var(--text-dim);
}

.permissions-status--ok {
    color: var(--accent);
}

.permissions-status--error {
    color: var(--error-text);
}

/* ── Toggle switch ─────────────────────────────────────── */

.toggle-switch {
    display: flex;
    justify-content: center;
    cursor: pointer;
}

.toggle-switch input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-track {
    position: relative;
    display: inline-block;
    width: 32px;
    height: 18px;
    background: var(--border-input);
    border-radius: 9px;
    transition: background 0.2s;
    flex-shrink: 0;
}

.toggle-track::after {
    content: "";
    position: absolute;
    top: 3px;
    left: 3px;
    width: 12px;
    height: 12px;
    background: var(--text-muted);
    border-radius: 50%;
    transition:
        transform 0.2s,
        background 0.2s;
}

.toggle-switch input:checked + .toggle-track {
    background: var(--accent-border);
}

.toggle-switch input:checked + .toggle-track::after {
    background: var(--accent);
    transform: translateX(14px);
}

.toggle-switch input:focus-visible + .toggle-track {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* ── Tool page layout (form-card + history panel) ──────── */

.tool-layout {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    width: 100%;
    max-width: 860px;
    justify-content: center;
}

/* Column wrapper that keeps tabs-bar and form-card vertically aligned */
.form-card-col {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 520px;
    flex-shrink: 0;
}

/* ── History side panel ────────────────────────────────── */

/* Invisible mirror of the history panel — keeps form-card-col centered */
.history-spacer {
    display: none;
    width: 280px;
    flex-shrink: 0;
}

.history-spacer--visible {
    display: block;
}

.history-panel {
    display: none;
    flex-direction: column;
    width: 280px;
    flex-shrink: 0;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    box-shadow: 0 8px 48px var(--shadow);
    max-height: 80vh;
    position: sticky;
    top: 24px;
    overflow: hidden;
}

.history-panel.history-panel--open {
    display: flex;
}

.history-panel-header {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-subtle);
    flex-shrink: 0;
}

.history-panel-title {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-label);
    flex: 1;
}

.history-tag-btn {
    background: transparent;
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    font-family: "IBM Plex Sans", sans-serif;
    font-size: 0.68rem;
    line-height: 1;
    cursor: pointer;
    padding: 3px 7px;
    border-radius: 3px;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
    flex-shrink: 0;
}

.history-tag-btn:hover {
    background: var(--accent-bg);
    border-color: var(--accent-border);
    color: var(--accent);
}

.history-close-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1;
    cursor: pointer;
    padding: 2px 4px;
    border-radius: 2px;
    transition: color 0.15s;
}

.history-close-btn:hover {
    color: var(--text-primary);
}

.history-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px 0;
}

.history-sentinel {
    height: 1px;
    flex-shrink: 0;
}

/* ── History commit rows ───────────────────────────────── */

.history-commit {
    display: flex;
    align-items: flex-start;
    gap: 0;
    cursor: pointer;
    padding: 6px 0;
    transition: background 0.12s;
}

.history-commit:hover {
    background: var(--accent-bg);
}

.history-commit--active {
    background: var(--accent-bg);
}

.history-commit--active .history-commit-hash {
    color: var(--accent);
}

/* Graph column: fixed-width monospace gutter */
.history-graph-col {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 32px;
    flex-shrink: 0;
    padding-top: 1px;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.78rem;
    line-height: 1.4;
    color: var(--text-muted);
    user-select: none;
}

.history-graph-node {
    color: var(--accent);
    line-height: 1.2;
}

.history-graph-node--tagged {
    color: var(--tag-stainless-fg);
}

.history-graph-line {
    color: var(--text-dim);
    line-height: 1;
    font-size: 0.7rem;
    /* extra lines to fill vertical gap between commits */
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
}

/* Info column: hash, message, date */
.history-commit-info {
    flex: 1;
    padding: 0 12px 0 0;
    min-width: 0;
}

.history-commit-hash {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.68rem;
    color: var(--text-muted);
    letter-spacing: 0.04em;
    margin-bottom: 2px;
}

.history-commit-msg {
    font-family: "IBM Plex Sans", sans-serif;
    font-size: 0.78rem;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 2px;
}

.history-commit-date {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.62rem;
    color: var(--text-dim);
    letter-spacing: 0.02em;
}

.history-commit-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: 4px;
}

.history-tag-badge {
    display: inline-block;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.6rem;
    padding: 1px 6px;
    border-radius: 2px;
    background: var(--tag-stainless-bg);
    color: var(--tag-stainless-fg);
    letter-spacing: 0.04em;
}

/* Loading row */
.history-loading-row {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px 0;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.68rem;
    color: var(--text-dim);
    letter-spacing: 0.06em;
}

/* Error row */
.history-error-row {
    padding: 12px 16px;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.68rem;
    color: var(--error-text);
}

/* ── History panel responsive ──────────────────────────── */

@media (max-width: 700px) {
    .tool-layout {
        flex-direction: column;
        align-items: center;
    }

    .form-card-col {
        max-width: 520px;
    }

    .history-panel {
        width: 100%;
        max-width: 520px;
        position: static;
        max-height: 340px;
    }

    .history-spacer--visible {
        display: none;
    }
}

/* ── Tag version inline UI ─────────────────────────────── */

.tag-input-row {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 10px 12px;
    border-bottom: 1px solid var(--border-subtle);
    flex-shrink: 0;
}

.tag-name-input {
    width: 100%;
    box-sizing: border-box;
    padding: 7px 10px;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.8rem;
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-subtle);
    border-radius: 3px;
    outline: none;
    transition: border-color 0.15s;
}

.tag-name-input:focus {
    border-color: var(--accent);
}

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

.tag-confirm-btn,
.tag-cancel-btn {
    flex: 1;
    padding: 6px 0;
    font-family: "IBM Plex Sans", sans-serif;
    font-size: 0.78rem;
    font-weight: 500;
    border: 1px solid var(--border-subtle);
    border-radius: 3px;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}

.tag-confirm-btn {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.tag-confirm-btn:hover {
    opacity: 0.85;
}

.tag-confirm-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.tag-cancel-btn {
    background: transparent;
    color: var(--text-secondary);
}

.tag-cancel-btn:hover {
    background: var(--accent-bg);
    color: var(--text-primary);
}

.tag-input-status {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.72rem;
    min-height: 1em;
}

.tag-input-status.tag-status--error {
    color: var(--error-text);
}

.tag-input-status.tag-status--ok {
    color: var(--tag-stainless-fg);
}

/* ── Keybindings popup ─────────────────────────────────── */

.kb-overlay {
    position: fixed;
    inset: 0;
    background: var(--modal-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    padding: 16px;
}

.kb-dialog {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    padding: 28px 28px 24px;
    width: 100%;
    max-width: 480px;
    box-shadow: 0 16px 64px var(--modal-shadow);
}

.kb-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: 22px;
}

.kb-title {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-heading);
}

.kb-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.2rem;
    line-height: 1;
    cursor: pointer;
    padding: 0 2px;
    transition: color 0.15s;
}

.kb-close:hover {
    color: var(--text-primary);
}

.kb-table {
    width: 100%;
    border-collapse: collapse;
}

.kb-table tr + tr td {
    border-top: 1px solid var(--border-divider);
}

.kb-table td {
    padding: 9px 0;
    vertical-align: middle;
}

.kb-table td:first-child {
    width: 44%;
    padding-right: 16px;
}

.kb-label {
    font-family: "IBM Plex Sans", sans-serif;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.kb-keys {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

kbd {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.72rem;
    color: var(--text-label);
    background: var(--bg-input);
    border: 1px solid var(--border-input);
    border-radius: 3px;
    padding: 3px 7px;
    white-space: nowrap;
}

.kb-plus {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.72rem;
    color: var(--text-dim);
    align-self: center;
}

/* ── Unit system badge (tool.html / edit.html header) ──────────────────────── */

.unit-system-badge {
    display: inline-block;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    padding: 2px 8px;
    border-radius: 3px;
    margin-top: 6px;
}

.unit-system-badge--si {
    background: var(--tag-steel-bg);
    color: var(--tag-steel-fg);
    border: 1px solid var(--accent-border);
}

.unit-system-badge--imperial {
    background: var(--tag-nylon-bg);
    color: var(--tag-nylon-fg);
    border: 1px solid #5a3e1a;
}

/* ── Unit filter bar (index.html listing) ──────────────────────────────────── */

.unit-filter-bar {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 0 4px;
    border-bottom: 1px solid var(--border-divider);
    margin-bottom: 4px;
}

.unit-filter-btn {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--text-label);
    background: var(--bg-input);
    border: 1px solid var(--border-input);
    border-radius: 3px;
    padding: 3px 10px;
    cursor: pointer;
    transition: color 0.1s, border-color 0.1s, background 0.1s;
}

.unit-filter-btn:hover:not(:disabled) {
    color: var(--text-primary);
    border-color: var(--border-subtle);
}

.unit-filter-btn--active {
    color: var(--accent);
    border-color: var(--accent-border);
    background: var(--accent-bg);
}

.unit-filter-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.unit-filter-unavailable {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.68rem;
    color: var(--text-muted);
    margin-left: 4px;
}

/* ── Auth bar username link variant ────────────────────────────────────────── */

.auth-bar-username--link {
    text-decoration: none;
    transition: color 0.15s;
}

.auth-bar-username--link:hover {
    color: var(--accent);
}

/* ── Profile page ───────────────────────────────────────────────────────────── */

body.profile-page {
    justify-content: flex-start;
    align-items: flex-start;
    padding: 0;
}

.profile-topbar {
    width: 100%;
    padding: 18px 28px 0;
    flex-shrink: 0;
}

.profile-layout {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    gap: 0;
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: 28px 24px 64px;
}

/* ── Sidebar ─────────────────────────────────────────────── */

.profile-sidebar {
    width: 260px;
    flex-shrink: 0;
    position: sticky;
    top: 28px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding-right: 32px;
}

.profile-avatar-art {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.55rem;
    line-height: 1.45;
    color: var(--accent);
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 50%;
    width: 96px;
    height: 96px;
    white-space: pre;
    letter-spacing: 0.1em;
    user-select: none;
    opacity: 0.85;
    overflow: hidden;
    flex-shrink: 0;
    /* center the text block inside the circle */
    display: block;
    text-align: center;
    padding-top: 18px;
    box-sizing: border-box;
}

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

.profile-identity-username {
    font-family: "IBM Plex Mono", monospace;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-heading);
    letter-spacing: 0.03em;
    word-break: break-all;
}

.profile-identity-email {
    font-size: 0.82rem;
    color: var(--text-muted);
    letter-spacing: 0.01em;
    word-break: break-all;
}

.profile-identity-id {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.68rem;
    color: var(--text-dim);
    letter-spacing: 0.06em;
    margin-top: 2px;
}

/* Stats row */

.profile-stats {
    display: flex;
    align-items: center;
    gap: 0;
    padding: 14px 0;
    border-top: 1px solid var(--border-divider);
    border-bottom: 1px solid var(--border-divider);
}

.profile-stat {
    display: flex;
    align-items: baseline;
    gap: 5px;
}

.profile-stat-value {
    font-family: "IBM Plex Mono", monospace;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-heading);
}

.profile-stat-label {
    font-family: "IBM Plex Sans", sans-serif;
    font-size: 0.78rem;
    color: var(--text-muted);
}

.profile-stat-sep {
    width: 1px;
    height: 16px;
    background: var(--border-divider);
    margin: 0 16px;
    flex-shrink: 0;
}

/* Sign-out */

.profile-sign-out-btn {
    display: block;
    width: 100%;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--error-text);
    background: transparent;
    border: 1px solid var(--error-border);
    border-radius: 3px;
    padding: 8px 0;
    cursor: pointer;
    text-align: center;
    transition: background 0.15s, border-color 0.15s;
}

.profile-sign-out-btn:hover {
    background: var(--error-bg);
    border-color: var(--error-text);
}

/* ── Content area ────────────────────────────────────────── */

.profile-content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.profile-section {
    padding: 0 0 36px;
}

.profile-section + .profile-section {
    padding-top: 32px;
    border-top: 1px solid var(--border-divider);
}

.profile-section-heading {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin: 0 0 16px;
}

/* ── Profile tool cards ─────────────────────────────────── */

.profile-tools-list,
.profile-toolboxes-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.profile-tool-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border-subtle);
    border-radius: 3px;
    margin-bottom: 6px;
    transition: border-color 0.15s, background 0.15s;
}

.profile-tool-card:last-child {
    margin-bottom: 0;
}

.profile-tool-card:hover {
    border-color: var(--accent);
    background: var(--bg-card);
}

.profile-tool-card--skeleton {
    height: 52px;
    background: linear-gradient(
        90deg,
        var(--bg-skeleton-a) 25%,
        var(--bg-skeleton-b) 50%,
        var(--bg-skeleton-a) 75%
    );
    background-size: 200% 100%;
    animation: skeleton-sweep 1.4s ease infinite;
    border-color: var(--bg-skeleton-b);
    cursor: default;
    pointer-events: none;
}

.profile-tool-card--skeleton:hover {
    border-color: var(--bg-skeleton-b);
    background: linear-gradient(
        90deg,
        var(--bg-skeleton-a) 25%,
        var(--bg-skeleton-b) 50%,
        var(--bg-skeleton-a) 75%
    );
    background-size: 200% 100%;
}

.profile-tool-card-left {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.profile-tool-card-name {
    font-family: "IBM Plex Sans", sans-serif;
    font-size: 0.9rem;
    color: var(--text-primary);
    text-decoration: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: color 0.15s;
}

.profile-tool-card:hover .profile-tool-card-name {
    color: var(--text-heading);
}

.profile-tool-card-meta {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.68rem;
    color: var(--text-dim);
    letter-spacing: 0.03em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.profile-tool-card-arrow {
    font-size: 0.85rem;
    color: var(--text-verydim);
    text-decoration: none;
    flex-shrink: 0;
    transition: color 0.15s, transform 0.15s;
}

.profile-tool-card:hover .profile-tool-card-arrow {
    color: var(--accent);
    transform: translateX(3px);
}

/* ── Profile toolbox cards ──────────────────────────────── */

.profile-toolbox-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 9px 0;
    border-bottom: 1px solid var(--border-divider);
}

.profile-toolbox-card:last-child {
    border-bottom: none;
}

.profile-toolbox-id {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.68rem;
    color: var(--text-dim);
    min-width: 32px;
    flex-shrink: 0;
}

.profile-toolbox-name {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.82rem;
    color: var(--accent);
    text-decoration: none;
    flex: 1;
}

.profile-toolbox-name:hover {
    text-decoration: underline;
}

.profile-empty {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.78rem;
    color: var(--text-muted);
    font-style: italic;
    padding: 4px 0;
}

/* ── Profile responsive ─────────────────────────────────── */

@media (max-width: 680px) {
    .profile-layout {
        flex-direction: column;
        padding: 20px 16px 48px;
        gap: 32px;
    }

    .profile-sidebar {
        width: 100%;
        position: static;
        padding-right: 0;
        flex-direction: row;
        flex-wrap: wrap;
        align-items: flex-start;
        gap: 16px;
    }

    .profile-avatar-art {
        align-self: center;
    }

    .profile-identity {
        flex: 1;
        min-width: 140px;
    }

    .profile-stats {
        width: 100%;
        border-top: none;
        padding-top: 0;
    }

    .profile-sign-out-btn {
        width: auto;
        padding: 8px 20px;
    }
}