/* ============================================================
   XTetris · GitHub Pages style
   ============================================================ */

:root {
  /* Tetris piece colors (classic) */
  --piece-i: #00f0f0;   /* I - cyan */
  --piece-o: #f0f000;   /* O - yellow */
  --piece-t: #a000f0;   /* T - purple */
  --piece-s: #00f000;   /* S - green */
  --piece-z: #f00000;   /* Z - red */
  --piece-l: #f0a000;   /* L - orange */
  --piece-j: #0000f0;   /* J - blue */

  --bg-dark:   #0d1117;
  --bg-panel:  #161b22;
  --bg-elev:   #1f242c;
  --border:    #30363d;
  --text:      #e6edf3;
  --text-mute: #9da7b3;
  --accent:    #58a6ff;
  --link:      #79c0ff;

  --radius:    10px;
  --shadow:    0 8px 24px rgba(0, 0, 0, 0.35);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
               Arial, "Noto Sans", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
               "Liberation Mono", monospace;
}

/* ----- reset & base ----- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg-dark);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; height: auto; }

code, pre {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

code {
  background: rgba(110, 118, 129, 0.25);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 520px;
  padding: 80px 24px 64px;
  background:
    radial-gradient(ellipse at top, rgba(160, 0, 240, 0.18), transparent 60%),
    radial-gradient(ellipse at bottom right, rgba(0, 240, 240, 0.12), transparent 60%),
    linear-gradient(180deg, #0d1117 0%, #11151c 100%);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tetris-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.tetris-bg .piece {
  position: absolute;
  width: 80px;
  height: 80px;
  border-radius: 8px;
  opacity: 0.18;
  filter: blur(0.5px);
  animation: float 14s ease-in-out infinite;
}
.piece-i { background: var(--piece-i); top: 10%; left: 5%; animation-delay: 0s; }
.piece-o { background: var(--piece-o); top: 20%; right: 8%; animation-delay: 1.2s; }
.piece-t { background: var(--piece-t); top: 60%; left: 12%; animation-delay: 2.4s; }
.piece-s { background: var(--piece-s); bottom: 10%; right: 20%; animation-delay: 3.6s; }
.piece-z { background: var(--piece-z); top: 40%; left: 80%; animation-delay: 4.8s; }
.piece-l { background: var(--piece-l); bottom: 20%; left: 40%; animation-delay: 6s; }
.piece-j { background: var(--piece-j); top: 70%; right: 5%; animation-delay: 7.2s; }

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50%      { transform: translateY(-22px) rotate(8deg); }
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 900px;
  width: 100%;
  text-align: center;
}

/* Logo dal README (piboh-images/xtetrisimage_nobg.png) */
.hero-logo {
  display: block;
  width: clamp(180px, 32vw, 240px);
  height: auto;
  margin: 0 auto 20px;
  border-radius: 50%;
  filter:
    drop-shadow(0 0 24px rgba(88, 166, 255, 0.35))
    drop-shadow(0 4px 18px rgba(0, 0, 0, 0.5));
  animation: logo-pulse 6s ease-in-out infinite;
}
@keyframes logo-pulse {
  0%, 100% {
    filter:
      drop-shadow(0 0 24px rgba(88, 166, 255, 0.35))
      drop-shadow(0 4px 18px rgba(0, 0, 0, 0.5));
    transform: translateY(0);
  }
  50% {
    filter:
      drop-shadow(0 0 36px rgba(88, 166, 255, 0.55))
      drop-shadow(0 4px 18px rgba(0, 0, 0, 0.5));
    transform: translateY(-4px);
  }
}

.hero-title {
  font-size: clamp(2.2rem, 4.5vw, 3.2rem);
  font-weight: 800;
  margin: 0 0 10px;
  letter-spacing: -0.02em;
  color: var(--text);
}

.hero-tagline {
  font-size: clamp(1.05rem, 1.5vw, 1.25rem);
  color: var(--text-mute);
  margin: 0 auto 28px;
  max-width: 620px;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  margin-bottom: 32px;
}
.badges img { height: 20px; }

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.98rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.2s ease,
              border-color 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none !important;
  user-select: none;
}
.btn:active { transform: translateY(1px); }
.btn-block { width: 100%; }

.btn-primary {
  background: linear-gradient(135deg, var(--piece-j), var(--piece-t));
  color: #fff;
  box-shadow: 0 4px 14px rgba(0, 0, 240, 0.35);
}
.btn-primary:hover { box-shadow: 0 6px 20px rgba(0, 0, 240, 0.5); }

.btn-secondary {
  background: var(--bg-elev);
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover { background: #262d36; border-color: var(--accent); }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover { background: rgba(255,255,255,0.04); border-color: var(--accent); }

/* ============================================================
   NAV
   ============================================================ */
.topnav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.topnav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.topnav-brand {
  font-weight: 800;
  color: var(--text);
  font-size: 1.1rem;
}
.topnav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 4px;
}
.topnav a {
  display: block;
  padding: 6px 12px;
  border-radius: 6px;
  color: var(--text-mute);
  font-size: 0.92rem;
}
.topnav a:hover {
  color: var(--text);
  background: rgba(255,255,255,0.05);
  text-decoration: none;
}

/* ============================================================
   SECTIONS
   ============================================================ */
.section {
  padding: 72px 0;
  border-bottom: 1px solid var(--border);
}
.section-alt { background: var(--bg-panel); }

.section-title {
  font-size: clamp(1.6rem, 2.4vw, 2.1rem);
  margin: 0 0 8px;
  font-weight: 800;
  letter-spacing: -0.01em;
}
.section-sub {
  color: var(--text-mute);
  margin: 0 0 28px;
  font-size: 1.05rem;
}
.section-title .accent-i,
.section-title .accent-o,
.section-title .accent-t,
.section-title .accent-s,
.section-title .accent-l,
.section-title .accent-j,
.section-title .accent-z {
  display: inline-block;
  margin-right: 6px;
}
.section-title .accent-i { color: var(--piece-i); }
.section-title .accent-o { color: var(--piece-o); }
.section-title .accent-t { color: var(--piece-t); }
.section-title .accent-s { color: var(--piece-s); }
.section-title .accent-l { color: var(--piece-l); }
.section-title .accent-j { color: var(--piece-j); }
.section-title .accent-z { color: var(--piece-z); }

.lead {
  font-size: 1.05rem;
  color: var(--text);
  margin: 0 0 16px;
}

/* ============================================================
   FEATURES
   ============================================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 28px;
}
.feature {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 20px;
  transition: transform 0.15s ease, border-color 0.2s ease;
}
.feature:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}
.feature-icon { font-size: 1.7rem; margin-bottom: 8px; }
.feature h3 { margin: 0 0 6px; font-size: 1.08rem; }
.feature p { margin: 0; color: var(--text-mute); font-size: 0.95rem; }

/* ============================================================
   README CONTENT
   ============================================================ */
.readme {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 36px;
  box-shadow: var(--shadow);
}
.readme.loading,
.changelog.loading {
  color: var(--text-mute);
  text-align: center;
}
.readme h1 {
  font-size: 2rem;
  margin-top: 0;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.readme h2 {
  font-size: 1.4rem;
  margin-top: 32px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.readme h3 { font-size: 1.15rem; margin-top: 24px; }
.readme p, .readme li { color: var(--text); }
.readme ul, .readme ol { padding-left: 24px; }
.readme li { margin-bottom: 4px; }
.readme a { color: var(--link); }

.readme pre,
.changelog pre,
.code-block pre {
  background: #0a0e14;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 16px;
  overflow-x: auto;
  margin: 14px 0;
  font-size: 0.88rem;
  line-height: 1.5;
}
.readme pre code,
.code-block pre code {
  background: transparent;
  padding: 0;
  font-size: inherit;
  color: #c9d1d9;
}

.readme blockquote {
  margin: 14px 0;
  padding: 0 16px;
  color: var(--text-mute);
  border-left: 3px solid var(--accent);
}

.readme table {
  border-collapse: collapse;
  margin: 14px 0;
  width: 100%;
}
.readme th, .readme td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}
.readme th { background: var(--bg-panel); }

/* ---------- README images: logo + badges ---------- */

/* Logo XTetris (la prima immagine del README) */
.readme img[src*="xtetrisimage"] {
  display: block;
  width: clamp(140px, 40%, 260px);
  max-width: 100%;
  height: auto;
  margin: 8px auto 18px;
  filter: drop-shadow(0 0 18px rgba(88, 166, 255, 0.25));
}

/* Tutte le altre immagini: vincola la larghezza */
.readme img {
  max-width: 100%;
  height: auto;
}

/* Badge shields.io: altezza fissa e allineamento verticale */
.readme img[src*="shields.io"] {
  height: 20px;
  vertical-align: middle;
  border-radius: 3px;
  margin: 2px 2px;
}

/* Wrapper dei badge (link <a>) */
.readme a img[src*="shields.io"] {
  display: inline-block;
}

/* Allinea verticalmente le righe di badge */
.readme p:has(img[src*="shields.io"]) {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 4px;
  align-items: center;
  margin: 8px 0 14px;
  line-height: 1;
}
.readme p:has(img[src*="shields.io"]) a {
  display: inline-flex;
  align-items: center;
  line-height: 1;
}

/* ---------- Version banner ---------- */
.version-banner {
  background: rgba(240, 160, 0, 0.12);
  border: 1px solid rgba(240, 160, 0, 0.45);
  color: #f0a000;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 0.9rem;
  margin: 0 0 22px;
}
.version-banner a { color: #f0c060; }

.readme-source {
  margin-top: 18px;
  font-size: 0.9rem;
  color: var(--text-mute);
}

/* ============================================================
   DOWNLOAD CARDS
   ============================================================ */
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}
.download-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform 0.15s ease, border-color 0.2s ease;
}
.download-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}
.download-card-primary {
  border-color: var(--piece-j);
  background: linear-gradient(160deg, rgba(0,0,240,0.08), var(--bg-elev) 60%);
}
.download-icon {
  font-size: 1.6rem;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: rgba(255,255,255,0.06);
  margin-bottom: 4px;
}
.download-card h3 { margin: 0; font-size: 1.1rem; }
.download-card p { margin: 0; color: var(--text-mute); font-size: 0.95rem; }
.download-note {
  font-size: 0.82rem !important;
  color: var(--text-mute);
  margin-top: 4px !important;
}

/* ============================================================
   CODE BLOCK w/ COPY
   ============================================================ */
.code-block {
  position: relative;
  background: #0a0e14;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 16px;
  overflow-x: auto;
}
.code-block pre {
  margin: 0;
  background: transparent;
  border: 0;
  padding: 0;
}
.code-block code { font-size: 0.88rem; color: #c9d1d9; }
.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 0.78rem;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.copy-btn:hover { background: #262d36; border-color: var(--accent); }
.copy-btn.copied { color: var(--piece-s); border-color: var(--piece-s); }

/* ============================================================
   GUIDE READER
   ============================================================ */
.guide-controls {
  display: flex;
  gap: 14px;
  align-items: center;
  flex-wrap: wrap;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin: 0 0 20px;
}
.guide-controls label {
  font-size: 1rem;
  color: var(--text);
  white-space: nowrap;
}
.guide-controls select {
  flex: 1;
  min-width: 260px;
  background: var(--bg-panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 9px 12px;
  font-family: var(--font-sans);
  font-size: 0.96rem;
  cursor: pointer;
  transition: border-color 0.15s ease;
}
.guide-controls select:hover { border-color: var(--accent); }
.guide-controls select:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.2);
}
.guide-controls option {
  background: var(--bg-panel);
  color: var(--text);
}
.guide-raw-link {
  font-size: 0.9rem;
  color: var(--link);
  white-space: nowrap;
}

/* ============================================================
   TABS / BUILD (rimosso: la sezione Build non serve più,
   il README contiene già tutte le istruzioni di compilazione)
   ============================================================ */
/* (vuoto - sezione rimossa) */

.numbered-menu {
  list-style: decimal;
  padding-left: 28px;
  margin: 14px 0 18px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 14px 14px 40px;
}
.numbered-menu li {
  padding: 4px 0;
  color: var(--text);
}
.numbered-menu li::marker { color: var(--piece-i); font-weight: 700; }

.callout-note {
  background: rgba(0, 240, 240, 0.08);
  border: 1px solid rgba(0, 240, 240, 0.35);
  border-left: 4px solid var(--piece-i);
  color: var(--text);
  padding: 12px 16px;
  border-radius: 8px;
  margin: 16px 0;
  font-size: 0.95rem;
}
.callout-note strong { color: var(--piece-i); }

/* ============================================================
   STRUCTURE
   ============================================================ */
.structure-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}
.structure-grid h3 { margin-top: 0; }
.tree {
  background: #0a0e14;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 16px 18px;
  overflow-x: auto;
  font-size: 0.84rem;
  line-height: 1.55;
  color: #c9d1d9;
  margin: 0;
}

/* ============================================================
   CHANGELOG
   ============================================================ */
.changelog {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
  box-shadow: var(--shadow);
}
.changelog h2 {
  font-size: 1.4rem;
  margin-top: 24px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.changelog h2:first-child { margin-top: 0; }
.changelog h3 { color: var(--accent); }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: #0a0e14;
  padding: 36px 0 24px;
  border-top: 1px solid var(--border);
  text-align: center;
}
.footer-inner { display: flex; flex-direction: column; gap: 10px; align-items: center; }
.footer-brand strong { font-size: 1.1rem; }
.footer-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  justify-content: center;
}
.footer-meta {
  font-size: 0.88rem;
  color: var(--text-mute);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 720px) {
  .hero { padding: 56px 16px 48px; min-height: 460px; }
  .section { padding: 52px 0; }
  .topnav-inner { flex-direction: column; gap: 8px; }
  .topnav ul { flex-wrap: wrap; justify-content: center; }
  .readme { padding: 22px 18px; }
  .changelog { padding: 22px 18px; }
}