:root {
    /* Brighter + more modern, while staying readable. */
    --bg1: #0b1220;
    --bg2: #0f1f3a;
    --panel: rgba(255, 255, 255, 0.98);
    --text: #0f172a;
    --muted: #475569;
    --border: rgba(15, 23, 42, 0.12);
    --soft: rgba(15, 23, 42, 0.04);

    --accent: #2563eb;
    /* blue */
    --accent-2: #7c3aed;
    /* purple */
    --accent-3: #06b6d4;
    /* cyan */

    --shadow: 0 12px 30px rgba(2, 6, 23, 0.18);
    --shadow-sm: 0 6px 16px rgba(2, 6, 23, 0.12);
    --radius: 12px;
}

* {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}

body {
    margin: 0;
    background:
        radial-gradient(1200px 700px at 15% 10%, rgba(124, 58, 237, 0.28), transparent 55%),
        radial-gradient(900px 560px at 85% 0%, rgba(37, 99, 235, 0.28), transparent 55%),
        linear-gradient(180deg, var(--bg1), var(--bg2));
    color: var(--text);
    font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial, "Noto Sans", "Helvetica Neue", sans-serif;
    font-size: 14px;
    line-height: 1.55;

    /* Sticky footer layout */
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main.container {
    flex: 1 0 auto;
    width: 100%;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 16px;
}

.header {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.22), rgba(124, 58, 237, 0.22));
    border-bottom: 1px solid rgba(255, 255, 255, 0.18);
    box-shadow: 0 10px 30px rgba(2, 6, 23, 0.18);
}

.header h1 {
    margin: 0;
    color: #ffffff;
    font-size: 30px;
    font-weight: 800;
    letter-spacing: -0.3px;
}

.sub {
    margin: 6px 0 0;
    color: rgba(255, 255, 255, 0.82);
    max-width: 60ch;
}

.tabs {
    display: flex;
    gap: 8px;
    padding: 14px 0 6px;
    flex-wrap: wrap;
}

.tab {
    border: 1px solid rgba(255, 255, 255, 0.18);
    background: rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.92);
    padding: 8px 12px;
    border-radius: 999px;
    cursor: pointer;
    font-size: 13px;
    transition: transform 120ms ease, background 120ms ease, border-color 120ms ease;
}

.tab.active {
    background: rgba(255, 255, 255, 0.18);
    border-color: rgba(255, 255, 255, 0.36);
    font-weight: 700;
}

.tab:hover {
    transform: translateY(-1px);
    background: rgba(255, 255, 255, 0.12);
}

.panel {
    display: none;
    padding: 10px 0 18px;
}

.panel.active {
    display: block;
}

.grid {
    display: grid;
    grid-template-columns: 1.1fr .9fr;
    gap: 12px;
}

@media (max-width: 880px) {
    .grid {
        grid-template-columns: 1fr;
    }
}

.card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow-sm);
}

.card h2 {
    margin: 0 0 8px;
    font-size: 18px;
    font-weight: 800;
    letter-spacing: -0.2px;
}

.card h3 {
    margin: 14px 0 6px;
    font-size: 13px;
    font-weight: 700;
    color: var(--muted);
}

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

@media (max-width: 700px) {
    .two {
        grid-template-columns: 1fr;
    }
}

.form .row {
    display: flex;
    gap: 10px;
    margin: 10px 0;
    flex-wrap: wrap;
}

label {
    display: flex;
    flex-direction: column;
    gap: 4px;
    color: var(--muted);
    font-size: 12px;
    flex: 1;
    min-width: 210px;
}

input,
select {
    padding: 6px 8px;
    border-radius: 10px;
    border: 1px solid rgba(15, 23, 42, 0.14);
    background: #fff;
    color: var(--text);
    outline: none;
    box-shadow: 0 1px 0 rgba(2, 6, 23, 0.04);
}

input:focus,
select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.18);
}

button {
    border: 1px solid rgba(255, 255, 255, 0.0);
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #fff;
    padding: 8px 12px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 13px;
    box-shadow: 0 10px 18px rgba(37, 99, 235, 0.22);
    transition: transform 120ms ease, filter 120ms ease, box-shadow 120ms ease;
}

button:hover {
    filter: brightness(1.02);
    transform: translateY(-1px);
    box-shadow: 0 12px 22px rgba(37, 99, 235, 0.26);
}

button:active {
    transform: translateY(0px);
    filter: brightness(0.98);
}

button:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

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

.actions {
    margin-top: 10px;
}

.mono {
    border: 1px solid rgba(15, 23, 42, 0.12);
    background: rgba(255, 255, 255, 0.78);
    border-radius: var(--radius);
    padding: 12px;
    overflow: auto;
    white-space: pre-wrap;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: 12px;
}

ul {
    margin: 8px 0 0;
    padding-left: 18px;
}

.list {
    margin: 0;
    padding-left: 18px;
    color: var(--text);
}

.list li {
    margin: 6px 0;
    color: var(--muted);
}

.footer {
    border-top: 1px solid rgba(255, 255, 255, 0.18);
    margin-top: auto;
    background: transparent;
}

.muted {
    color: var(--muted);
}

code {
    color: var(--accent-3);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: 0.95em;
}