:root {
    color-scheme: light dark;
    --bg: #f7f7f8;
    --card-bg: #ffffff;
    --text: #1a1a1a;
    --muted: #6b7280;
    --border: #e5e7eb;
    --accent: #2452c9;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #16171a;
        --card-bg: #212226;
        --text: #eaeaec;
        --muted: #9a9ba3;
        --border: #33343a;
        --accent: #6f9bff;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
}

.topnav {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 16px 32px;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
}

.topnav .brand {
    font-weight: 700;
    margin-right: 16px;
}

.topnav a {
    color: var(--text);
    text-decoration: none;
    font-size: 14px;
}

.topnav a:hover { color: var(--accent); }

main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 32px;
}

h1 { margin-top: 0; }

.stat-row {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px 24px;
    min-width: 160px;
    display: block;
    text-decoration: none;
    color: inherit;
    transition: border-color 0.15s, transform 0.15s;
}

.stat-card:hover {
    border-color: var(--accent);
    transform: translateY(-1px);
}

.stat-value { font-size: 28px; font-weight: 700; }
.stat-label { color: var(--muted); font-size: 13px; }

.trend-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.trend-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
}

.trend-card h3 { margin: 8px 0; font-size: 15px; }
.trend-card p { color: var(--muted); font-size: 13px; margin: 0; }

.trend-category {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--accent);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
}

th, td {
    text-align: left;
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    font-size: 13px;
    vertical-align: top;
}

th { color: var(--muted); font-weight: 600; }

a { color: var(--accent); }

.rationale { color: var(--muted); max-width: 320px; }

.source-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 999px;
    background: var(--bg);
    border: 1px solid var(--border);
    font-size: 11px;
    color: var(--muted);
    white-space: nowrap;
}

.empty { color: var(--muted); font-style: italic; }
.subtle { color: var(--muted); margin-top: -8px; }

.filter-form {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
}

.filter-form input,
.filter-form select {
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--card-bg);
    color: var(--text);
    font-size: 14px;
}

button {
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    background: var(--accent);
    color: white;
    cursor: pointer;
    font-size: 14px;
}

.chat-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-width: 640px;
}

.chat-form textarea {
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--card-bg);
    color: var(--text);
    font-family: inherit;
    font-size: 14px;
}

.chat-form button { align-self: flex-start; }

.answer-card {
    margin-top: 24px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px;
    max-width: 720px;
}

.sources {
    margin-top: 12px;
    font-size: 12px;
    color: var(--muted);
}

.login-main {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 32px;
    width: 320px;
    text-align: center;
}

.login-card h1 { font-size: 20px; margin-bottom: 4px; }

.login-form {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 16px;
}

.login-form input {
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
}

.login-error {
    color: #d84343;
    font-size: 13px;
    margin: 8px 0 0;
}

.nav-spacer { flex: 1; }

.bubble {
    cursor: pointer;
    transition: opacity 0.15s;
}

.bubble:hover {
    opacity: 1 !important;
}

.matrix-scroll {
    overflow-x: auto;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px;
}