:root {
    color-scheme: dark;
    --bg: #070b12;
    --panel: #101722;
    --panel-soft: #151f2d;
    --text: #eef6ff;
    --muted: #9fb0c3;
    --line: #263449;
    --accent: #2dd4bf;
    --accent-strong: #5eead4;
    --danger: #fb7185;
    --code-bg: #050811;
    --code-text: #dbeafe;
    --shadow: 0 24px 70px rgba(0, 0, 0, 0.42);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family:
        Inter,
        ui-sans-serif,
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;
    color: var(--text);
    background:
        radial-gradient(
            circle at 18% 10%,
            rgba(45, 212, 191, 0.16),
            transparent 32%
        ),
        radial-gradient(
            circle at 88% 18%,
            rgba(59, 130, 246, 0.12),
            transparent 28%
        ),
        linear-gradient(180deg, #09111f 0%, #070b12 58%, #05070c 100%),
        var(--bg);
}

button,
select,
textarea {
    font: inherit;
}

.app-shell {
    width: min(1440px, 100%);
    min-height: 100vh;
    margin: 0 auto;
    padding: 32px;
}

.topbar {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    align-items: flex-end;
    margin-bottom: 24px;
}

.eyebrow {
    color: var(--accent-strong);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0;
    text-transform: uppercase;
}

h1,
h2,
p {
    margin: 0;
}

h1 {
    max-width: 780px;
    font-size: 34px;
    line-height: 2;
    letter-spacing: 0;
}

h2 {
    font-size: 1rem;
}

.topbar p,
.panel-header p {
    color: var(--muted);
    font-size: 0.92rem;
}

.status-pill {
    flex: 0 0 auto;
    padding: 9px 14px;
    border: 1px solid rgba(15, 118, 110, 0.26);
    border-radius: 999px;
    color: var(--accent-strong);
    background: rgba(20, 184, 166, 0.1);
    font-size: 0.85rem;
    font-weight: 700;
}

.status-pill.is-working {
    color: #854d0e;
    border-color: rgba(251, 191, 36, 0.32);
    background: rgba(251, 191, 36, 0.1);
}

.status-pill.is-error {
    color: var(--danger);
    border-color: rgba(251, 113, 133, 0.3);
    background: rgba(251, 113, 133, 0.1);
}

.workspace {
    display: grid;
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: 22px;
    align-items: stretch;
}

.panel {
    min-width: 0;
    min-height: 650px;
    padding: 22px;
    border: 1px solid rgba(148, 163, 184, 0.18);
    border-radius: 8px;
    background: rgba(16, 23, 34, 0.86);
    box-shadow: var(--shadow);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    align-items: flex-start;
    margin-bottom: 18px;
}

.editor-panel,
.output-panel,
.result-stack {
    display: flex;
    flex-direction: column;
}

.editor-panel {
    gap: 18px;
}

.output-panel {
    gap: 16px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

#latex-input {
    width: 100%;
    min-height: 360px;
    resize: vertical;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 8px;
    outline: none;
    background: #0b111c;
    color: #e5f0ff;
    font-family:
        "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.98rem;
    line-height: 1.7;
    transition:
        border-color 0.18s,
        box-shadow 0.18s;
}

#latex-input:focus {
    border-color: rgba(15, 118, 110, 0.62);
    box-shadow: 0 0 0 4px rgba(45, 212, 191, 0.12);
}

.toolbar {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
}

.control {
    display: flex;
    flex-direction: column;
    gap: 6px;
    color: var(--muted);
    font-size: 0.78rem;
    font-weight: 700;
}

select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #0b111c;
    color: var(--text);
}

.primary-btn,
.ghost-btn,
.examples button {
    border-radius: 8px;
    border: 1px solid transparent;
    cursor: pointer;
    font-weight: 800;
    transition:
        transform 0.16s,
        background 0.16s,
        border-color 0.16s;
}

.primary-btn {
    padding: 11px 18px;
    color: #042f2e;
    background: var(--accent);
}

.primary-btn:hover {
    background: var(--accent-strong);
}

.primary-btn:disabled {
    opacity: 0.68;
    cursor: wait;
}

.ghost-btn {
    padding: 9px 13px;
    color: var(--accent-strong);
    background: rgba(45, 212, 191, 0.1);
    border-color: rgba(45, 212, 191, 0.22);
}

.examples {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.examples button {
    padding: 8px 11px;
    color: #dbeafe;
    background: #0b111c;
    border-color: var(--line);
    font-size: 0.83rem;
}

.examples button:hover,
.ghost-btn:hover {
    transform: translateY(-1px);
    border-color: rgba(45, 212, 191, 0.42);
}

.result-stack {
    gap: 14px;
}

.meta-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.meta-card,
.variable-types,
.empty-state {
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--panel-soft);
}

.meta-card {
    min-width: 0;
    padding: 12px;
}

.meta-card span {
    display: block;
    color: var(--muted);
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
}

.meta-card strong {
    display: block;
    margin-top: 4px;
    overflow-wrap: anywhere;
    font-family:
        "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.84rem;
}

.variable-types {
    padding: 13px;
}

.variable-types-title {
    margin-bottom: 10px;
    color: var(--muted);
    font-size: 0.82rem;
    font-weight: 800;
    text-transform: uppercase;
}

.variable-type-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(168px, 1fr));
    gap: 10px;
}

.variable-type-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.variable-name {
    min-width: 0;
    overflow-wrap: anywhere;
    font-family:
        "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.86rem;
}

.variable-type-row select {
    min-width: 112px;
    padding: 7px 9px;
}

.code-output {
    min-height: 360px;
    margin: 0;
    padding: 18px;
    overflow: auto;
    border-radius: 8px;
    border: 1px solid #1f2937;
    background: var(--code-bg);
    color: var(--code-text);
    font-family:
        "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.9rem;
    line-height: 1.75;
    white-space: pre;
}

.tok-keyword {
    color: #93c5fd;
    font-weight: 800;
}

.tok-string {
    color: #86efac;
}

.tok-number {
    color: #fbbf24;
}

.tok-namespace {
    color: #67e8f9;
}

.tok-operator {
    color: #f0abfc;
}

.error {
    padding: 13px 14px;
    border: 1px solid rgba(180, 35, 24, 0.2);
    border-radius: 8px;
    color: var(--danger);
    background: rgba(251, 113, 133, 0.08);
    font-size: 0.9rem;
}

.empty-state {
    display: grid;
    place-items: center;
    flex: 1;
    min-height: 420px;
    padding: 28px;
    color: var(--muted);
    text-align: center;
}

.empty-mark {
    display: grid;
    place-items: center;
    width: 72px;
    height: 72px;
    margin-bottom: 14px;
    border: 1px solid rgba(15, 118, 110, 0.22);
    border-radius: 8px;
    color: var(--accent-strong);
    background: rgba(45, 212, 191, 0.1);
    font-size: 2rem;
    font-weight: 900;
}

@media (max-width: 960px) {
    .app-shell {
        padding: 18px;
    }

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

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

    .panel {
        min-height: auto;
    }
}

@media (max-width: 620px) {
    .app-shell {
        padding: 12px;
    }

    h1 {
        font-size: 2rem;
    }

    .panel {
        padding: 14px;
    }

    .panel-header,
    .toolbar,
    .meta-row {
        grid-template-columns: 1fr;
    }

    .panel-header {
        flex-direction: column;
    }

    .primary-btn,
    .ghost-btn {
        width: 100%;
    }
}