/* 2x1000 Open Data — Partiti politici
   Stile istituzionale, sobrio, coerente con un portale open data. */

:root {
  --color-bg: #f7f8fa;
  --color-surface: #ffffff;
  --color-text: #1c2530;
  --color-text-muted: #5b6472;
  --color-border: #dde2e8;
  --color-primary: #0b4f6c;
  --color-primary-dark: #073349;
  --color-primary-light: #e6eef2;
  --color-accent: #147d75;
  --color-positive: #147d75;
  --color-negative: #b23a2e;
  --color-warning: #a9741c;
  --radius: 8px;
  --shadow-sm: 0 1px 2px rgba(15, 30, 45, 0.06);
  --shadow-md: 0 4px 16px rgba(15, 30, 45, 0.08);
  --font-sans: "Source Sans 3", "Segoe UI", Helvetica, Arial, sans-serif;
  --max-width: 1180px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #10151b;
    --color-surface: #171e26;
    --color-text: #e8edf2;
    --color-text-muted: #9aa7b4;
    --color-border: #2a333d;
    --color-primary: #4fa3c4;
    --color-primary-dark: #7cc0dd;
    --color-primary-light: #1b2b33;
    --color-accent: #3fb3a8;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

h1, h2, h3, h4 { line-height: 1.25; font-weight: 700; color: var(--color-text); }
h1 { font-size: 2rem; margin: 0 0 .5rem; }
h2 { font-size: 1.4rem; margin: 2rem 0 1rem; }
h3 { font-size: 1.1rem; margin: 1.5rem 0 .75rem; }
p { color: var(--color-text); }
a { color: var(--color-primary); text-decoration: none; }
a:hover, a:focus { text-decoration: underline; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 8px 14px;
  z-index: 1000;
}
.skip-link:focus { left: 0; }

/* Header */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  gap: 20px;
}
.brand { display: flex; flex-direction: column; color: var(--color-text); }
.brand-mark { font-size: 1.4rem; font-weight: 800; color: var(--color-primary); }
.brand-sub { font-size: .78rem; color: var(--color-text-muted); }
.main-nav ul {
  list-style: none;
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}
.main-nav a {
  display: inline-block;
  padding: 8px 12px;
  border-radius: var(--radius);
  color: var(--color-text);
  font-weight: 600;
  font-size: .95rem;
}
.main-nav a.active, .main-nav a:hover { background: var(--color-primary-light); color: var(--color-primary-dark); text-decoration: none; }
.nav-toggle { display: none; }
@media (max-width: 800px) {
  .nav-toggle {
    display: inline-block;
    padding: 8px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    color: var(--color-text);
    font-weight: 600;
  }
  .main-nav ul { display: none; flex-direction: column; width: 100%; }
  .main-nav ul.open { display: flex; }
  .header-inner { flex-wrap: wrap; }
}
.observatory-strip {
  background: var(--color-primary-dark);
  color: #eaf2f6;
  font-size: .8rem;
  padding: 6px 0;
}

/* Hero */
.hero {
  background: linear-gradient(180deg, var(--color-primary-light), transparent);
  padding: 48px 0 32px;
}
.hero p.lead { font-size: 1.15rem; color: var(--color-text-muted); max-width: 720px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 1.5rem; }

/* Buttons */
.btn {
  display: inline-block;
  padding: 10px 18px;
  border-radius: var(--radius);
  font-weight: 600;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  background: transparent;
}
.btn:hover { background: var(--color-primary-light); text-decoration: none; }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-dark); }
.btn-sm { padding: 6px 12px; font-size: .85rem; }

/* Sections & cards */
.section { padding: 2.5rem 0; }
.section-alt { background: var(--color-surface); border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin: 1.5rem 0;
}
.kpi-card { text-align: left; }
.kpi-label { font-size: .82rem; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: .03em; }
.kpi-value { font-size: 1.9rem; font-weight: 800; color: var(--color-primary-dark); margin-top: 4px; }
.kpi-delta { font-size: .85rem; margin-top: 4px; }
.kpi-delta.positive { color: var(--color-positive); }
.kpi-delta.negative { color: var(--color-negative); }

.chart-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 1.25rem; margin-bottom: 1.5rem; box-shadow: var(--shadow-sm); }
.chart-card h3 { margin-top: 0; }
.chart-wrap { position: relative; height: 320px; }
.chart-wrap.short { height: 260px; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
@media (max-width: 900px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }

/* Tables */
.table-wrap { overflow-x: auto; border: 1px solid var(--color-border); border-radius: var(--radius); }
table.data-table { width: 100%; border-collapse: collapse; background: var(--color-surface); font-size: .92rem; }
table.data-table caption { text-align: left; padding: 10px 14px; font-weight: 600; color: var(--color-text-muted); }
table.data-table th, table.data-table td { padding: 10px 14px; border-bottom: 1px solid var(--color-border); text-align: right; white-space: nowrap; }
table.data-table th:first-child, table.data-table td:first-child { text-align: left; white-space: normal; }
table.data-table thead th { background: var(--color-primary-light); color: var(--color-primary-dark); font-weight: 700; position: sticky; top: 0; }
table.data-table tbody tr:hover { background: var(--color-primary-light); }
table.data-table a { font-weight: 600; }

/* Filters / forms */
.filter-bar { display: flex; flex-wrap: wrap; gap: 12px; align-items: end; margin: 1.25rem 0; }
.field { display: flex; flex-direction: column; gap: 4px; }
.field label { font-size: .82rem; font-weight: 600; color: var(--color-text-muted); }
select, input[type=text], input[type=search], input[type=number] {
  padding: 8px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: .95rem;
}

/* Badges */
.badge { display: inline-block; padding: 3px 9px; border-radius: 999px; font-size: .78rem; font-weight: 700; background: var(--color-primary-light); color: var(--color-primary-dark); }
.badge-demo { background: #f4e3c2; color: #7a4e0a; }
.badge-rank { background: var(--color-accent); color: #fff; }

/* Method / source boxes */
.box-method, .box-source {
  border-left: 4px solid var(--color-primary);
  background: var(--color-primary-light);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.25rem 0;
}
.box-source { border-left-color: var(--color-accent); }

/* Breadcrumb */
.breadcrumb { font-size: .85rem; color: var(--color-text-muted); margin-bottom: 1rem; }
.breadcrumb a { color: var(--color-text-muted); }
.breadcrumb span[aria-current] { color: var(--color-text); font-weight: 600; }

/* Downloads */
.download-list { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(220px,1fr)); gap: 12px; }
.download-list li { border: 1px solid var(--color-border); border-radius: var(--radius); padding: 12px 14px; background: var(--color-surface); display: flex; justify-content: space-between; align-items: center; gap: 8px; }

/* Footer */
.site-footer { background: var(--color-primary-dark); color: #dce7ec; margin-top: 3rem; }
.footer-inner { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 24px; padding: 2.5rem 0; }
.footer-col h2 { color: #fff; font-size: 1rem; }
.footer-col a { color: #cfe3ea; }
.footer-col p { color: #cfe3ea; }
.footer-col ul { list-style: none; padding: 0; }
.footer-bottom { padding: 1rem 0 1.5rem; font-size: .82rem; color: #a9c1cb; border-top: 1px solid rgba(255,255,255,.12); }
@media (max-width: 800px) { .footer-inner { grid-template-columns: 1fr; } }

/* Utility */
.text-muted { color: var(--color-text-muted); }
.mt-0 { margin-top: 0; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }
.compare-picker { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 1.25rem; }
.compare-picker label { display: flex; align-items: center; gap: 6px; border: 1px solid var(--color-border); border-radius: 999px; padding: 6px 12px; background: var(--color-surface); font-size: .88rem; }