@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=IBM+Plex+Mono:wght@500;600&display=swap');

:root {
    --ink: #17212B;
    --ink-soft: #5B6B7A;
    --ink-faint: #8C99A6;
    --bg: #F5F7F9;
    --panel: #FFFFFF;
    --line: #E3E8EC;

    --sidebar-bg: #0F1620;
    --sidebar-ink: #C7D1DB;
    --sidebar-ink-dim: #71808F;
    --sidebar-active: #1B2632;

    --brand: #3454D1;
    --brand-dark: #263F9E;
    --brand-soft: #EEF1FC;

    --age-fresh: #2F9E63;
    --age-normal: #3B82C4;
    --age-medium: #D9A441;
    --age-high: #DB7A2C;
    --age-critical: #CC3B32;
}

* { box-sizing: border-box; }
html, body { height: 100%; }

body {
    margin: 0;
    font-family: 'Inter', -apple-system, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--ink);
    line-height: 1.5;
    display: flex;
    min-height: 100vh;
}

.mono { font-family: 'IBM Plex Mono', 'Courier New', monospace; }

/* ---------- Sidebar ---------- */
.sidebar {
    width: 232px;
    flex-shrink: 0;
    background: var(--sidebar-bg);
    color: var(--sidebar-ink);
    padding: 24px 16px;
    position: sticky;
    top: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    gap: 28px;
}
.sidebar-brand { display: flex; align-items: center; gap: 10px; padding: 0 8px; }
.brand-mark { color: var(--brand); font-size: 1.3rem; line-height: 1; }
.brand-name { font-family: 'IBM Plex Mono', monospace; font-weight: 600; font-size: 0.95rem; color: #fff; }
.brand-sub { font-size: 0.72rem; color: var(--sidebar-ink-dim); margin-top: 2px; }

.sidebar-nav { display: flex; flex-direction: column; gap: 2px; }
.sidebar-nav a {
    color: var(--sidebar-ink);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    padding: 10px 12px;
    border-radius: 6px;
}
.sidebar-nav a:hover { background: var(--sidebar-active); color: #fff; }
.sidebar-nav a.active { background: var(--brand); color: #fff; }

/* ---------- Main content ---------- */
.container {
    flex: 1;
    max-width: 1180px;
    margin: 0 auto;
    padding: 40px 40px 90px;
    width: 100%;
}

h1 { font-size: 1.55rem; font-weight: 700; margin: 0 0 6px; letter-spacing: -0.01em; }
h2 { font-size: 1.05rem; font-weight: 600; margin: 36px 0 14px; color: var(--ink); }
.muted { color: var(--ink-soft); }
.small { font-size: 0.82rem; }
.faint { color: var(--ink-faint); }

/* ---------- KPI cards ---------- */
.stat-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 22px; }
.stat-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-left: 3px solid var(--brand);
    border-radius: 4px;
    padding: 16px 18px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.stat-card.stat-warning { border-left-color: var(--age-high); }
.stat-card.stat-critical { border-left-color: var(--age-critical); }
.stat-value { font-family: 'IBM Plex Mono', monospace; font-size: 1.5rem; font-weight: 600; }
.stat-label { font-size: 0.8rem; color: var(--ink-soft); }

/* ---------- Panels ---------- */
.panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 20px 22px;
}
.panel-row { display: grid; grid-template-columns: 1.3fr 1fr; gap: 16px; align-items: start; }

/* ---------- Age bars ---------- */
.age-bars { display: flex; flex-direction: column; gap: 11px; }
.age-bar-row { display: grid; grid-template-columns: 84px 1fr 60px; align-items: center; gap: 12px; }
.age-bar-label { font-size: 0.82rem; color: var(--ink-soft); }
.age-bar-track { background: var(--bg); border: 1px solid var(--line); border-radius: 3px; height: 14px; overflow: hidden; }
.age-bar-fill { height: 100%; }
.age-bar-count { font-family: 'IBM Plex Mono', monospace; font-size: 0.82rem; text-align: right; }

.age-fresh { background: var(--age-fresh); }
.age-normal { background: var(--age-normal); }
.age-medium { background: var(--age-medium); }
.age-high { background: var(--age-high); }
.age-critical { background: var(--age-critical); }

.pill { display: inline-block; padding: 3px 10px; border-radius: 20px; font-size: 0.76rem; font-weight: 600; color: #fff; white-space: nowrap; }
.pill.age-fresh { background: var(--age-fresh); }
.pill.age-normal { background: var(--age-normal); }
.pill.age-medium { background: var(--age-medium); }
.pill.age-high { background: var(--age-high); }
.pill.age-critical { background: var(--age-critical); }

/* ---------- Category breakdown list ---------- */
.rank-list { display: flex; flex-direction: column; gap: 10px; }
.rank-row { display: grid; grid-template-columns: 20px 1fr auto; gap: 10px; align-items: center; font-size: 0.88rem; }
.rank-num { color: var(--ink-faint); font-family: 'IBM Plex Mono', monospace; font-size: 0.78rem; }
.rank-name { font-weight: 500; }
.rank-value { font-family: 'IBM Plex Mono', monospace; color: var(--ink-soft); font-size: 0.85rem; }

/* ---------- Tables ---------- */
.table-wrap { background: var(--panel); border: 1px solid var(--line); border-radius: 6px; overflow: auto; margin-top: 12px; }
table { width: 100%; border-collapse: collapse; font-size: 0.87rem; }
th, td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line); white-space: nowrap; }
th { color: var(--ink-soft); font-weight: 600; font-size: 0.76rem; background: #FAFBFC; letter-spacing: 0.01em; }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: #FAFBFD; }
.text-warning { color: var(--age-high); font-weight: 600; }
.text-critical { color: var(--age-critical); font-weight: 600; }

/* ---------- Filters ---------- */
.filter-bar { display: flex; gap: 8px; margin: 18px 0; flex-wrap: wrap; align-items: center; }
.filter-bar input, .filter-bar select {
    padding: 8px 12px;
    border: 1px solid var(--line);
    border-radius: 5px;
    font-family: inherit;
    font-size: 0.86rem;
    background: var(--panel);
    color: var(--ink);
}
.filter-bar .filter-group { display: flex; flex-direction: column; gap: 3px; }
.filter-bar label.filter-label { font-size: 0.72rem; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.03em; }

/* ---------- Buttons ---------- */
.btn {
    display: inline-block;
    padding: 9px 18px;
    border-radius: 5px;
    border: 1px solid var(--line);
    background: var(--panel);
    color: var(--ink);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.87rem;
    cursor: pointer;
}
.btn:hover { border-color: var(--ink-faint); }
.btn-primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); border-color: var(--brand-dark); }
.btn-sm { padding: 5px 12px; font-size: 0.78rem; }

/* ---------- Alerts ---------- */
.alert { padding: 14px 18px; border-radius: 6px; margin: 16px 0; font-size: 0.9rem; }
.alert-error { background: #FBEAE8; border: 1px solid #E5B4AE; color: #8A2E24; }
.alert-success { background: #E9F5EC; border: 1px solid #B7DCC1; color: #256339; }
.alert ul { margin: 6px 0 0; padding-left: 20px; }

.upload-form, .preview-form { margin-top: 16px; }
.mode-choice { background: var(--panel); border: 1px solid var(--line); border-radius: 6px; padding: 16px 18px; margin-bottom: 16px; }
.mode-choice label { display: block; margin: 8px 0; font-size: 0.9rem; }

.empty-state { padding: 40px 20px; text-align: center; color: var(--ink-faint); }

@media (max-width: 900px) {
    body { flex-direction: column; }
    .sidebar { width: 100%; height: auto; position: relative; flex-direction: row; align-items: center; padding: 14px 18px; }
    .sidebar-nav { flex-direction: row; flex-wrap: wrap; }
    .stat-cards { grid-template-columns: repeat(2, 1fr); }
    .panel-row { grid-template-columns: 1fr; }
    .container { padding: 24px 18px 60px; }
}