/* ── Reset & variabili ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg:        #0a0a0f;
  --surface:   #13131a;
  --border:    #2a2a3a;
  --accent:    #e8ff3c;
  --accent-dim:#b8cc20;
  --text:      #f0f0f8;
  --muted:     #5a5a7a;
  --neg:       #ff4c6a;
  --neg-dim:   #cc2a44;
  --glow-pos:  rgba(232, 255, 60, 0.25);
  --glow-neg:  rgba(255, 76, 106, 0.25);
}

/* ── Layout base ── */
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Space Mono', monospace;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* Griglia di sfondo */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* ── App wrapper ── */
#app {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

/* ── Label ── */
#label {
  font-size: 1rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 16px;
  opacity: 0;
  animation: fadeUp 0.6s 0.1s ease forwards;
}

/* ── Card ── */
#card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 48px 56px 44px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 36px;
  opacity: 0;
  animation: fadeUp 0.6s 0.25s ease forwards;
  box-shadow: 0 40px 80px rgba(0,0,0,0.5);
}

/* ── Display del valore ── */
#value-wrapper {
  position: relative;
  width: 200px;
  height: 110px;
  display: flex;
  align-items: center;
  justify-content: center;
}

#value {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 7rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--text);
  transition: color 0.2s;
  user-select: none;
}

#value.bump-up {
  animation: bumpUp 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  color: var(--accent);
}

#value.bump-down {
  animation: bumpDown 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  color: var(--neg);
}

#value.flash-zero {
  animation: flashZero 0.35s ease;
}

/* ── Divisore ── */
#divider {
  width: 100%;
  height: 1px;
  background: var(--border);
}

/* ── Pulsanti ── */
#controls {
  display: flex;
  gap: 16px;
  align-items: center;
}

.btn {
  width: 80px;
  height: 80px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  font-family: 'Space Mono', monospace;
  font-size: 2rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.1s, background 0.15s, border-color 0.15s, box-shadow 0.15s, color 0.15s;
  outline: none;
  user-select: none;
}

.btn:active {
  transform: scale(0.92);
}

#btn-inc {
  border-color: rgba(232, 255, 60, 0.3);
  color: var(--accent);
}

#btn-inc:hover {
  background: rgba(232, 255, 60, 0.08);
  border-color: var(--accent);
  box-shadow: 0 0 20px var(--glow-pos), inset 0 0 10px rgba(232,255,60,0.05);
}

#btn-reset {
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
  width: 60px;
  height: 60px;
  border-radius: 10px;
  user-select: none;
}

#btn-reset:hover {
  color: var(--text);
  background: rgba(255,255,255,0.05);
  border-color: rgba(255,255,255,0.2);
}

#btn-dec {
  border-color: rgba(255, 76, 106, 0.3);
  color: var(--neg);
}

#btn-dec:hover {
  background: rgba(255, 76, 106, 0.08);
  border-color: var(--neg);
  box-shadow: 0 0 20px var(--glow-neg), inset 0 0 10px rgba(255,76,106,0.05);
}

/* ── Selettore step ── */
#step-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: -8px;
}

#step-label {
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.step-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--muted);
  font-family: 'Space Mono', monospace;
  font-size: 0.85rem;
  padding: 6px 12px;
  cursor: pointer;
  transition: all 0.15s;
  outline: none;
  user-select: none;
}

.step-btn:hover {
  color: var(--text);
  border-color: rgba(255,255,255,0.25);
}

.step-btn.active {
  background: rgba(232, 255, 60, 0.1);
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Cronologia ── */
#history-wrap {
  margin-top: 28px;
  width: 320px;
  opacity: 0;
  animation: fadeUp 0.6s 0.4s ease forwards;
}

#history-title {
  font-size: 0.85rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
}

#history-list {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.hist-pill {
  font-size: 0.8rem;
  font-family: 'Space Mono', monospace;
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px solid var(--border);
  color: var(--muted);
  animation: popIn 0.2s ease;
  user-select: none;
  cursor: default;
}

.hist-pill.pos {
  border-color: rgba(232,255,60,0.3);
  color: var(--accent-dim);
}

.hist-pill.neg {
  border-color: rgba(255,76,106,0.3);
  color: var(--neg-dim);
}

/* ── Hint tastiera ── */
#hint {
  margin-top: 20px;
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  color: var(--muted);
  text-align: center;
  opacity: 0;
  animation: fadeUp 0.6s 0.55s ease forwards;
  user-select: none;
  cursor: default;
}

#hint kbd {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 6px;
  font-family: 'Space Mono', monospace;
}

/* ── Animazioni ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes bumpUp {
  0%   { transform: scale(1)    translateY(0); }
  40%  { transform: scale(1.08) translateY(-6px); }
  100% { transform: scale(1)    translateY(0); }
}

@keyframes bumpDown {
  0%   { transform: scale(1)    translateY(0); }
  40%  { transform: scale(1.08) translateY(6px); }
  100% { transform: scale(1)    translateY(0); }
}

@keyframes flashZero {
  0%, 100% { opacity: 1; }
  30%       { opacity: 0.2; }
  60%       { opacity: 1; }
}

@keyframes popIn {
  from { transform: scale(0.7); opacity: 0; }
  to   { transform: scale(1);   opacity: 1; }
}

/* ── Header / Logo ── */
#site-header {
  position: fixed;
  top: 0px;
  left: 0px;
  z-index: 10;
  opacity: 0;
  animation: fadeUp 0.6s 0.05s ease forwards;
}

#site-logo {
  height: clamp(80px, 14vw, 200px);
  width: auto;
  display: block;
  margin-top: -20px;
  margin-left: -20px;
}

/* ── Footer ── */
#site-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 16px 24px 20px;
  background: linear-gradient(to top, rgba(10,10,15,0.98) 60%, transparent);
  opacity: 0;
  animation: fadeUp 0.6s 0.6s ease forwards;
}

.footer-copy,
.footer-made {
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.footer-links {
  display: flex;
  gap: 10px;
  margin-top: 6px;
}

.footer-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  font-family: 'Space Mono', monospace;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.footer-btn:hover {
  color: var(--text);
  border-color: rgba(255,255,255,0.25);
  background: rgba(255,255,255,0.05);
}

/* ════════════════════════════
   RESPONSIVE — MOBILE FIRST
   ════════════════════════════ */

/* Tablet (max 768px) */
@media (max-width: 768px) {
  #site-header {
    top: 0px;
    left: 0px;
  }

  #card {
    padding: 36px 32px 32px;
    gap: 28px;
    border-radius: 16px;
    width: 90vw;
    max-width: 400px;
  }

  #value-wrapper {
    width: 160px;
    height: 90px;
  }

  #value {
    font-size: 5.5rem;
  }

  .btn {
    width: 70px;
    height: 70px;
    font-size: 1.8rem;
  }

  #btn-reset {
    width: 52px;
    height: 52px;
    font-size: 0.65rem;
  }

  #history-wrap {
    width: 90vw;
    max-width: 400px;
  }

  #hint {
    font-size: 0.7rem;
  }

  #site-footer {
    padding: 12px 16px 16px;
    gap: 4px;
  }
}

/* Mobile (max 480px) */
@media (max-width: 480px) {
  body {
    justify-content: center;
    padding: 80px 0 120px;
  }

  #site-header {
    top: 0px;
    left: 0px;
  }

  #label {
    font-size: 0.85rem;
  }

  #card {
    padding: 28px 20px 24px;
    gap: 22px;
    border-radius: 14px;
    width: 92vw;
  }

  #value-wrapper {
    width: 140px;
    height: 80px;
  }

  #value {
    font-size: 4.5rem;
  }

  #controls {
    gap: 12px;
  }

  .btn {
    width: 64px;
    height: 64px;
    font-size: 1.6rem;
    border-radius: 12px;
  }

  #btn-reset {
    width: 46px;
    height: 46px;
    font-size: 0.6rem;
  }

  #step-row {
    gap: 8px;
  }

  #step-label {
    font-size: 0.75rem;
  }

  .step-btn {
    font-size: 0.75rem;
    padding: 5px 10px;
  }

  #history-wrap {
    width: 92vw;
    margin-top: 20px;
  }

  #history-title {
    font-size: 0.75rem;
  }

  .hist-pill {
    font-size: 0.7rem;
    padding: 3px 8px;
  }

  #hint {
    font-size: 0.65rem;
    padding: 0 12px;
  }

  .footer-copy,
  .footer-made {
    font-size: 0.7rem;
  }

  .footer-btn {
    font-size: 0.7rem;
    padding: 5px 12px;
  }

  .footer-links {
    gap: 6px;
  }
}

/* Mobile piccolo (max 360px) */
@media (max-width: 360px) {
  #value {
    font-size: 3.8rem;
  }

  .btn {
    width: 56px;
    height: 56px;
    font-size: 1.4rem;
  }

  #btn-reset {
    width: 40px;
    height: 40px;
    font-size: 0.55rem;
  }
}