/* ============================================================
   La Scienza dei Dati — shared base styles
   Variables, reset, body, top-nav, chips, privacy banner,
   focus & reduced-motion. Page-specific styles stay inline.
   ============================================================ */

:root {
  --bg: #060d1f;
  --bg-2: #0a1430;
  --surface: rgba(120, 180, 255, 0.06);
  --surface-2: rgba(120, 180, 255, 0.11);
  --border: rgba(140, 200, 255, 0.18);
  --text: #ffffff;
  --text-soft: #f0f6ff;
  --muted: #c8dff5;
  --accent: #4fc3ff;
  --accent-2: #6ad7ff;
  --deep: #1e3a8a;
  --green: #5eead4;
  --orange: #ffb86b;
  --pink: #ff8fb1;
  --gold: #fcd34d;
  --font-display: "Syne", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-body: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", ui-monospace, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}
body {
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(79, 195, 255, 0.18), transparent 60%),
    radial-gradient(900px 500px at 110% 10%, rgba(30, 58, 138, 0.45), transparent 60%),
    radial-gradient(700px 400px at 50% 110%, rgba(106, 215, 255, 0.10), transparent 60%),
    var(--bg);
  min-height: 100vh;
}

/* ===== Skip link & focus ===== */
.skip-link {
  position: absolute;
  top: -40px;
  left: 12px;
  background: var(--accent);
  color: #061226;
  padding: 8px 14px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 13px;
  z-index: 200;
  transition: top .2s ease;
}
.skip-link:focus { top: 12px; }
*:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ===== Eyebrow tag ===== */
.eyebrow {
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  background: var(--surface);
  backdrop-filter: blur(10px);
}

/* ===== Canvas background ===== */
#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

/* ===== Top nav ===== */
.top-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 14px 32px;
  background: rgba(6, 13, 31, 0.82);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(79, 195, 255, 0.09);
}
.top-nav a {
  padding: 9px 20px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
  transition: all .2s ease;
  backdrop-filter: blur(10px);
}
.top-nav a:hover { transform: translateY(-1px); border-color: var(--accent); }
.top-nav a.current {
  background: linear-gradient(135deg, var(--deep), var(--accent));
  border-color: transparent;
  color: #fff;
  box-shadow: 0 6px 20px rgba(79,195,255,0.25);
}

/* ===== Global paragraph color ===== */
p { color: #ffffff; }

/* ===== Scroll reveal ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Chips (base) ===== */
.chip-row { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }
.chip {
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  transition: all .2s ease;
  backdrop-filter: blur(10px);
  font-weight: 500;
}
.chip:hover { background: var(--surface-2); transform: translateY(-1px); border-color: var(--accent); }
.chip.active {
  background: linear-gradient(135deg, var(--deep), var(--accent));
  color: #fff;
  border-color: transparent;
  font-weight: 700;
  box-shadow: 0 6px 20px rgba(79,195,255,0.25);
}

/* ===== Privacy banner ===== */
#privacy-banner {
  position: fixed;
  bottom: 16px;
  left: 16px;
  right: 16px;
  max-width: 580px;
  margin: 0 auto;
  background: rgba(10,20,48,0.96);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 18px;
  z-index: 500;
  box-shadow: 0 18px 40px rgba(0,0,0,0.5);
}
#privacy-banner .pb-inner { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
#privacy-banner p { color: #dbe7fb; font-size: 13px; line-height: 1.55; flex: 1 1 240px; margin: 0; }
#privacy-banner p a { color: var(--accent); }
#privacy-banner code {
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--surface-2);
  padding: 1px 6px;
  border-radius: 4px;
}
#privacy-banner button {
  padding: 8px 16px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--deep), var(--accent));
  color: #fff;
  border: 0;
  cursor: pointer;
  font-family: inherit;
  font-weight: 700;
  font-size: 13px;
}
#privacy-banner button:hover { transform: translateY(-1px); }

/* ===== Mini footer ===== */
.footer-mini {
  text-align: center;
  padding: 30px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
  font-family: var(--font-mono);
  margin-top: 30px;
}
.footer-mini a { color: var(--accent); text-decoration: none; }
.footer-mini a:hover { text-decoration: underline; }

/* ===== Reduced motion ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============================================================
   SiteGame UI components
   ============================================================ */

/* Floating XP gain text */
.game-float-xp {
  position: absolute;
  pointer-events: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: #fcd34d;
  text-shadow: 0 0 12px rgba(252,211,77,0.7);
  z-index: 9999;
  white-space: nowrap;
  transform: translateX(-50%);
  animation: gameFloatUp 1.4s cubic-bezier(.2,.8,.2,1) forwards;
}
@keyframes gameFloatUp {
  0%   { opacity: 0; transform: translateX(-50%) translateY(0)    scale(0.5); }
  20%  { opacity: 1; transform: translateX(-50%) translateY(-22px) scale(1.1); }
  100% { opacity: 0; transform: translateX(-50%) translateY(-80px) scale(1);   }
}

/* Achievement toast */
.game-toast {
  position: fixed;
  bottom: 110px;
  right: 24px;
  background: linear-gradient(135deg, rgba(252,211,77,0.22), rgba(255,184,107,0.18), rgba(10,20,48,0.96));
  border: 1px solid var(--gold);
  border-radius: 18px;
  padding: 16px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  max-width: 300px;
  z-index: 9998;
  backdrop-filter: blur(18px);
  box-shadow: 0 12px 40px rgba(252,211,77,0.22);
  transform: translateX(130%);
  opacity: 0;
  transition: transform .45s cubic-bezier(.2,.8,.2,1), opacity .45s ease;
}
.game-toast.show { transform: translateX(0); opacity: 1; }
.game-toast-icon { font-size: 34px; flex-shrink: 0; }
.game-toast-eyebrow {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 700;
  margin-bottom: 3px;
}
.game-toast-title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 3px;
}
.game-toast-desc { font-size: 12.5px; color: #e8d89a; line-height: 1.4; }

/* Mini HUD — fixed bottom-right corner */
.game-mini-hud {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: linear-gradient(135deg, rgba(30,58,138,0.92), rgba(6,13,31,0.97));
  border: 1px solid rgba(252,211,77,0.35);
  border-radius: 14px;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 9000;
  backdrop-filter: blur(18px);
  box-shadow: 0 8px 28px rgba(0,0,0,0.45);
  cursor: default;
  transition: transform .2s ease, box-shadow .2s ease;
}
.game-mini-hud:hover { transform: translateY(-2px); box-shadow: 0 14px 36px rgba(0,0,0,0.55); }
.gmh-icon { font-size: 18px; }
.gmh-level {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  color: var(--gold);
  margin-bottom: 4px;
}
.gmh-bar {
  width: 78px;
  height: 5px;
  background: rgba(255,255,255,0.11);
  border-radius: 999px;
  overflow: hidden;
}
.gmh-bar > span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--gold), var(--orange));
  border-radius: 999px;
  width: 0%;
  transition: width .5s cubic-bezier(.2,.8,.2,1);
  box-shadow: 0 0 8px rgba(252,211,77,0.5);
}

/* Explorer progress bar */
.explorer-bar {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 18px auto 0;
  padding: 10px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  backdrop-filter: blur(10px);
  max-width: 480px;
  width: calc(100% - 40px);
}
.explorer-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  white-space: nowrap;
  letter-spacing: 0.06em;
}
.explorer-bar-track {
  flex: 1;
  height: 7px;
  background: var(--surface-2);
  border-radius: 999px;
  overflow: hidden;
  min-width: 60px;
}
#explorer-fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--deep), var(--accent), var(--green));
  border-radius: 999px;
  width: 0%;
  transition: width .6s cubic-bezier(.2,.8,.2,1);
  box-shadow: 0 0 10px rgba(79,195,255,0.4);
}
.explorer-count {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  white-space: nowrap;
}

/* Explored card state */
.card.explored { border-color: rgba(94,234,212,0.45); }
.card.explored::after {
  content: "✓";
  position: absolute;
  top: 10px;
  right: 12px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0d7c66, #5eead4);
  color: #fff;
  font-size: 11px;
  font-weight: 800;
  display: grid;
  place-items: center;
  box-shadow: 0 0 10px rgba(94,234,212,0.45);
}

/* Flash Challenge button */
.flash-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  background: linear-gradient(135deg, rgba(252,211,77,0.18), rgba(255,184,107,0.16));
  border: 1px solid var(--gold);
  border-radius: 999px;
  color: var(--gold);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  transition: all .2s ease;
  margin-top: 14px;
  box-shadow: 0 4px 14px rgba(252,211,77,0.18);
}
.flash-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(252,211,77,0.35);
  background: linear-gradient(135deg, rgba(252,211,77,0.28), rgba(255,184,107,0.24));
}

/* Flash Challenge modal */
.flash-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(4,10,24,0.84);
  backdrop-filter: blur(18px);
  z-index: 300;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.flash-backdrop.open { display: flex; animation: fade .2s ease; }
.flash-modal {
  background: linear-gradient(180deg, #0d1a3a, #081229);
  border: 1px solid rgba(252,211,77,0.3);
  border-radius: 24px;
  max-width: 540px;
  width: 100%;
  padding: 32px;
  position: relative;
  animation: pop .3s cubic-bezier(.2,.8,.2,1);
  text-align: center;
  box-shadow: 0 24px 64px rgba(0,0,0,0.6);
}
.flash-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 700;
  margin-bottom: 6px;
}
.flash-tagline {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.5vw, 22px);
  font-weight: 600;
  color: #fff;
  line-height: 1.45;
  letter-spacing: -0.01em;
  margin: 14px 0 26px;
  min-height: 58px;
}
.flash-choices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 18px;
}
@media (max-width: 480px) { .flash-choices { grid-template-columns: 1fr; } }
.flash-choice {
  padding: 14px 12px;
  border-radius: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: #fff;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 13.5px;
  cursor: pointer;
  transition: all .2s ease;
  line-height: 1.35;
  text-align: center;
}
.flash-choice:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--surface-2);
  transform: translateY(-2px);
}
.flash-choice:disabled { cursor: not-allowed; }
.flash-choice.correct {
  background: linear-gradient(135deg, rgba(94,234,212,0.22), var(--surface-2));
  border-color: var(--green);
  animation: correct-pop .5s cubic-bezier(.2,.8,.2,1);
}
.flash-choice.wrong {
  background: linear-gradient(135deg, rgba(255,143,177,0.2), var(--surface-2));
  border-color: var(--pink);
  animation: shake .4s;
}
.flash-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 12px;
}
.flash-meta b { color: var(--gold); }
.flash-next-btn {
  padding: 11px 26px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--deep), var(--accent));
  color: #fff;
  border: 0;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  transition: transform .2s ease;
  display: none;
  box-shadow: 0 6px 18px rgba(79,195,255,0.28);
}
.flash-next-btn.show { display: inline-block; }
.flash-next-btn:hover { transform: translateY(-2px); }
.flash-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  cursor: pointer;
  font-size: 16px;
  display: grid; place-items: center;
  transition: all .2s ease;
}
.flash-close:hover { background: var(--pink); color: #061226; border-color: transparent; }

/* ===== Site Footer (shared, 4-column) ===== */
.site-footer {
  margin-top: 60px;
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, transparent, rgba(10, 20, 48, 0.7));
  padding: 60px 40px 28px;
}
.sf-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 52px;
}
@media (max-width: 900px) { .sf-grid { grid-template-columns: 1fr 1fr; gap: 36px; } }
@media (max-width: 520px) { .sf-grid { grid-template-columns: 1fr; } }
.sf-brand .sf-logo { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.sf-logo-mark {
  width: 50px; height: 50px;
  border-radius: 10px;
  object-fit: contain;
  display: block;
  flex-shrink: 0;
  box-shadow: 0 4px 14px rgba(0,0,0,0.25);
  padding: 2px;
}
.sf-brand strong { font-family: var(--font-display); font-size: 17px; color: #fff; }
.sf-brand p { color: #c9dcf5; font-size: 13.5px; line-height: 1.65; max-width: 300px; margin: 0 0 16px; }
.sf-badges { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 0; }
.sf-badges span {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 4px 10px;
  letter-spacing: 0.04em;
}
.sf-col h5 {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
  font-weight: 700;
}
.sf-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.sf-col a {
  color: rgba(216,230,251,0.75);
  text-decoration: none;
  font-size: 13.5px;
  transition: color .2s, transform .2s;
  display: inline-block;
}
.sf-col a:hover { color: var(--accent); transform: translateX(3px); }
.sf-bottom {
  max-width: 1200px;
  margin: 40px auto 0;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 12px;
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
}
.sf-bottom-links { display: flex; gap: 16px; }
.sf-bottom a { color: var(--muted); text-decoration: none; transition: color .2s; }
.sf-bottom a:hover { color: var(--accent); }