:root[data-theme="dark"] {
    --bg: #121212;
    --surface: #181818;
    --surface-hover: #222222;
    --text: #e0e0e0;
    --text-muted: #888888;
    --accent: #e5a93c;
    --accent-glow: rgba(229, 169, 60, 0.12);
    --border: #333333;
    --border-dim: #222222;
    --code-bg: #151515;
    --selection: #333333;
    --success: #81c784;
    --error: #f07178;
    --tok-kw: #cba6f7;
    --tok-fn: #89b4fa;
    --tok-str: #a6e3a1;
    --tok-num: #fab387;
    --tok-bool: #fab387;
    --tok-type: #f9e2af;
    --tok-bty: #f38ba8;
    --tok-op: #89dceb;
    --tok-cmt: #6c7086;
    --tok-eff: #f5c2e7;
    --tok-esc: #f2cdcd;
}

:root[data-theme="light"] {
    --bg: #faf8f5;
    --surface: #f0ede6;
    --surface-hover: #e5e0d8;
    --text: #1a1a1a;
    --text-muted: #666666;
    --accent: #d97706;
    --accent-glow: rgba(217, 119, 6, 0.1);
    --border: #cccccc;
    --border-dim: #e2ded6;
    --code-bg: #eae6df;
    --selection: #e2ded6;
    --success: #2e7d32;
    --error: #d9381e;
    --tok-kw: #8839ef;
    --tok-fn: #1e66f5;
    --tok-str: #40a02b;
    --tok-num: #fe640b;
    --tok-bool: #fe640b;
    --tok-type: #df8e1d;
    --tok-bty: #ea76cb;
    --tok-op: #04a5e5;
    --tok-cmt: #9ca0b0;
    --tok-eff: #ea76cb;
    --tok-esc: #d20f39;
}

* { box-sizing: border-box; }

::selection {
    background-color: var(--selection);
    color: var(--text);
}

html, body {
    background-color: var(--bg);
    color: var(--text);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Courier New", monospace;
    font-size: 15px;
    line-height: 1.6;
}

body {
    max-width: 760px;
    margin: 0 auto;
    padding: 0 20px 80px 20px;
}

header {
    border-bottom: 1px solid var(--border);
    padding: 16px 0 12px 0;
    margin-bottom: 24px;
}

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

.site-brand {
    font-size: 1.25rem;
    font-weight: bold;
}

.site-brand small {
    color: var(--text-muted);
    font-weight: normal;
    font-size: 0.85rem;
}

.status-badge {
    display: inline-block;
    font-size: 0.75rem;
    color: var(--accent);
    border: 1px solid var(--border);
    padding: 2px 8px;
    background: var(--surface);
}

button.theme-toggle {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    font-family: inherit;
    font-size: 0.8rem;
    padding: 4px 12px;
    cursor: pointer;
}

button.theme-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--surface-hover);
}

.tab-bar {
    display: flex;
    gap: 2px;
    border-bottom: 1px solid var(--border);
    overflow-x: auto;
    white-space: nowrap;
    margin-bottom: 0;
}

.tab-btn {
    background: var(--surface);
    border: 1px solid var(--border);
    border-bottom: none;
    color: var(--text-muted);
    padding: 6px 14px;
    font-size: 0.82rem;
    font-family: inherit;
    cursor: pointer;
}

.tab-btn.active {
    background: var(--code-bg);
    color: var(--accent);
    border-color: var(--accent);
    font-weight: bold;
}

.code-frame {
    border: 1px solid var(--border);
    background-color: var(--code-bg);
    margin: 16px 0;
    position: relative;
}

.code-frame:first-of-type {
    margin-top: 8px;
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 4px 12px;
    font-size: 0.78rem;
    color: var(--text-muted);
}

.copy-btn {
    background: transparent;
    border: none;
    color: var(--accent);
    font-family: inherit;
    font-size: 0.78rem;
    cursor: pointer;
    margin-left: auto;
    padding: 0;
}
.copy-btn:hover {
    text-decoration: underline;
}

.editor-wrap {
    position: relative;
    overflow: hidden;
}

#backdrop {
    position: absolute;
    inset: 0;
    margin: 0;
    padding: 0.75rem;
    min-height: 0;
    overflow: hidden;
    pointer-events: none;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Courier New", monospace;
    font-size: 16px;
    font-style: normal;
    font-weight: normal;
    line-height: 24px;
    letter-spacing: normal;
    font-kerning: none;
    font-variant-ligatures: none;
    tab-size: 4;
    white-space: pre-wrap;
    word-wrap: break-word;
    will-change: transform;
}

textarea {
    position: relative;
    width: 100%;
    min-height: 220px;
    max-height: 70vh;
    display: block;
    background: transparent;
    color: transparent;
    caret-color: var(--accent);
    border: none;
    padding: 0.75rem;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Courier New", monospace;
    font-size: 16px;
    resize: none;
    line-height: 24px;
    letter-spacing: normal;
    font-kerning: none;
    font-variant-ligatures: none;
    tab-size: 4;
    white-space: pre-wrap;
    overflow-wrap: break-word;
}

textarea:focus { outline: none; }

textarea::selection {
    background-color: var(--selection);
}

.tok-kw { color: var(--tok-kw); font-weight: bold; }
.tok-fn { color: var(--tok-fn); }
.tok-str { color: var(--tok-str); }
.tok-num { color: var(--tok-num); }
.tok-bool { color: var(--tok-bool); }
.tok-type { color: var(--tok-type); }
.tok-bty { color: var(--tok-bty); }
.tok-op { color: var(--tok-op); }
.tok-cmt { color: var(--tok-cmt); font-style: italic; }
.tok-eff { color: var(--tok-eff); }
.tok-esc { color: var(--tok-esc); }

#complete {
    position: absolute;
    z-index: 10;
    display: none;
    background: var(--surface);
    border: 1px solid var(--border);
    max-height: 40vh;
    overflow-y: auto;
    min-width: 140px;
    max-width: 90%;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
    padding: 0.25rem;
    margin: 0;
    list-style: none;
}

#complete li {
    padding: 0.4rem 0.6rem;
    border-radius: 4px;
    cursor: pointer;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 0;
}

#complete li.active {
    background: var(--accent);
    color: #121212;
}

#complete li .kind {
    color: var(--text-muted);
    font-size: 0.8em;
    margin-left: 0.5rem;
}

#complete li.active .kind { color: #121212; }

button.btn-primary {
    font: inherit;
    font-size: 0.9rem;
    font-weight: bold;
    background: var(--accent);
    color: #121212;
    border: 1px solid var(--accent);
    border-radius: 0;
    padding: 0.35rem 1rem;
    cursor: pointer;
    margin-top: 0.6rem;
    min-height: 40px;
}

button.btn-primary:hover {
    filter: brightness(1.1);
}

button.toggle-btn {
    font: inherit;
    font-size: 0.9rem;
    background: var(--surface);
    color: var(--text-muted);
    border: 1px solid var(--border);
    border-radius: 0;
    padding: 0.35rem 1rem;
    cursor: pointer;
    margin-top: 0.6rem;
    min-height: 40px;
}

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

button.toggle-btn[aria-pressed="true"] {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-glow);
}
button.btn-primary:disabled {
    background: var(--surface);
    color: var(--text-muted);
    border-color: var(--border);
    cursor: wait;
}

#status {
    color: var(--text-muted);
    margin: 0.5rem 0;
    min-height: 1.2em;
    font-size: 0.85rem;
}

#status .pos { float: right; }

pre {
    margin: 0;
    padding: 0.75rem;
    white-space: pre-wrap;
    word-break: break-word;
    min-height: 3em;
    font-size: 0.95rem;
    overflow-x: auto;
}

#stderr { color: var(--error); }

.hint {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-top: 0.75rem;
}

kbd {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0 0.35em;
    font-size: 0.85em;
}

@media (max-width: 600px) {
    body { padding: 0 12px 40px 12px; overflow-x: hidden; }
    header { padding: 12px 0 10px 0; margin-bottom: 20px; }
    .header-top { flex-direction: column; align-items: flex-start; gap: 8px; }
    .site-brand { font-size: 1.1rem; }
    .status-badge { font-size: 0.68rem; }
    .tab-bar { gap: 0; }
    .tab-btn { padding: 5px 10px; font-size: 0.75rem; }
    textarea { min-height: 35vh; padding: 0.6rem; }
    #backdrop { padding: 0.6rem; }
    button.btn-primary { width: 100%; }
    .code-header { font-size: 0.7rem; padding: 4px 8px; }
    pre { font-size: 0.75rem; padding: 8px 6px; }
    #status { font-size: 0.8rem; }
    #status .pos { float: none; display: block; }
}