/* ============================================================
   style.css — QuizGame  |  Mobile-first, dark arcade theme
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Exo+2:wght@400;600;800&family=Inter:wght@400;500&display=swap');

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

:root {
  --bg:        #0d0f1a;
  --surface:   #161929;
  --surface2:  #1e2236;
  --border:    rgba(255,255,255,0.08);
  --accent:    #f5a623;
  --accent2:   #e85d75;
  --blue:      #4f8ef7;
  --green:     #3ecf8e;
  --text:      #eef0f8;
  --muted:     #8890aa;
  --radius:    14px;
  --font-head: 'Exo 2', sans-serif;
  --font-body: 'Inter', sans-serif;
  --shadow:    0 4px 32px rgba(0,0,0,0.5);
}

html { font-size: 16px; }
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* ─── Background pattern ───────────────────────────────────── */
body::before {
  content: '';
  position: fixed; inset: 0;
  background-image:
    radial-gradient(circle at 20% 20%, rgba(79,142,247,0.12) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(245,166,35,0.10) 0%, transparent 50%),
    repeating-linear-gradient(
      0deg, transparent, transparent 39px,
      rgba(255,255,255,0.025) 40px
    ),
    repeating-linear-gradient(
      90deg, transparent, transparent 39px,
      rgba(255,255,255,0.025) 40px
    );
  pointer-events: none;
  z-index: 0;
}

/* ─── Hero / Home ──────────────────────────────────────────── */
.hero-center {
  position: relative; z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.5rem;
  gap: 3rem;
}

.logo-wrap { text-align: center; }
.logo-icon {
  font-size: 3.5rem;
  color: var(--accent);
  display: block;
  margin-bottom: 0.5rem;
  animation: pulse-icon 2.5s ease-in-out infinite;
}
@keyframes pulse-icon {
  0%,100% { transform: scale(1); opacity: 1; }
  50%      { transform: scale(1.08); opacity: 0.85; }
}

.logo-text {
  font-family: var(--font-head);
  font-size: clamp(2.8rem, 10vw, 5rem);
  font-weight: 800;
  letter-spacing: -1px;
  background: linear-gradient(135deg, #fff 30%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
}

.logo-sub {
  margin-top: 0.6rem;
  color: var(--muted);
  font-size: 1rem;
  letter-spacing: 0.04em;
}

.home-actions {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
  max-width: 340px;
}

/* ─── Buttons ──────────────────────────────────────────────── */
.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 1rem 1.5rem;
  border-radius: var(--radius);
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, opacity 0.15s;
  width: 100%;
}
.btn:active { transform: scale(0.97); }

.btn-icon { font-size: 0.85em; }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #e0821a);
  color: #1a0e00;
  box-shadow: 0 4px 20px rgba(245,166,35,0.35);
}
.btn-primary:hover { box-shadow: 0 6px 28px rgba(245,166,35,0.5); transform: translateY(-2px); }

.btn-secondary {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.btn-secondary:hover { background: var(--surface); transform: translateY(-2px); }

.btn-danger {
  background: linear-gradient(135deg, var(--accent2), #c0304d);
  color: #fff;
}
.btn-green {
  background: linear-gradient(135deg, var(--green), #28a870);
  color: #001a0e;
  box-shadow: 0 4px 20px rgba(62,207,142,0.3);
}
.btn-blue {
  background: linear-gradient(135deg, var(--blue), #2a64d0);
  color: #fff;
}
.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none !important; }

/* ─── Card / Container ─────────────────────────────────────── */
.page-content {
  position: relative; z-index: 1;
  min-height: 100vh;
  padding: 1.5rem 1rem 3rem;
  max-width: 640px;
  margin: 0 auto;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow);
}

.page-title {
  font-family: var(--font-head);
  font-size: 1.7rem;
  font-weight: 800;
  margin-bottom: 0.3rem;
  color: var(--text);
}
.page-title span { color: var(--accent); }

.page-sub {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

/* ─── Form elements ────────────────────────────────────────── */
.form-group { margin-bottom: 1.1rem; }

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--muted);
  margin-bottom: 0.4rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

input[type=text],
input[type=number],
input[type=file],
textarea,
select {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 0.7rem 0.9rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  appearance: none;
}
input:focus, textarea:focus, select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(245,166,35,0.15);
}
textarea { resize: vertical; min-height: 80px; }
select option { background: var(--surface2); }
input[type=file] { padding: 0.5rem 0.9rem; cursor: pointer; }

.input-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

/* ─── Step indicator ───────────────────────────────────────── */
.step-bar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
}
.step-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--surface2);
  border: 1px solid var(--border);
  transition: background 0.3s;
}
.step-dot.active { background: var(--accent); border-color: var(--accent); }
.step-dot.done   { background: var(--green);  border-color: var(--green); }
.step-line {
  flex: 1; height: 1px;
  background: var(--border);
}

/* ─── Answer buttons (gioco) ───────────────────────────────── */
.answer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-top: 1rem;
}
@media (max-width: 380px) {
  .answer-grid { grid-template-columns: 1fr; }
}

.answer-btn {
  background: var(--surface2);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 600;
  padding: 1rem 0.75rem;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, transform 0.1s;
  text-align: left;
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  line-height: 1.3;
}
.answer-btn .letter {
  width: 26px; height: 26px;
  border-radius: 6px;
  background: var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem;
  flex-shrink: 0;
}
.answer-btn:hover:not(:disabled) {
  border-color: var(--accent);
  background: rgba(245,166,35,0.07);
  transform: translateY(-2px);
}
.answer-btn.selected  { border-color: var(--blue);  background: rgba(79,142,247,0.12); }
.answer-btn.correct   { border-color: var(--green); background: rgba(62,207,142,0.12); }
.answer-btn.wrong     { border-color: var(--accent2); background: rgba(232,93,117,0.12); }
.answer-btn:disabled  { cursor: not-allowed; opacity: 0.8; }

/* ─── Countdown bar ────────────────────────────────────────── */
.countdown-wrap {
  margin: 1rem 0;
}
.countdown-bar-bg {
  height: 8px;
  background: var(--surface2);
  border-radius: 4px;
  overflow: hidden;
}
.countdown-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--green), var(--accent));
  border-radius: 4px;
  transition: width 1s linear, background 1s;
}
.countdown-bar-fill.warning { background: linear-gradient(90deg, var(--accent), var(--accent2)); }
.countdown-num {
  font-family: var(--font-head);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--accent);
  text-align: right;
  margin-top: 0.2rem;
}

/* ─── Score badge ──────────────────────────────────────────── */
.score-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(62,207,142,0.12);
  border: 1px solid rgba(62,207,142,0.3);
  border-radius: 99px;
  padding: 0.25rem 0.8rem;
  font-family: var(--font-head);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--green);
}

/* ─── Classifica ───────────────────────────────────────────── */
.classifica-list { list-style: none; }
.classifica-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 1rem;
  border-radius: 10px;
  margin-bottom: 0.5rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  transition: transform 0.2s;
}
.classifica-item:first-child  { border-color: rgba(245,166,35,0.5); background: rgba(245,166,35,0.06); }
.classifica-item:nth-child(2) { border-color: rgba(192,192,192,0.4); }
.classifica-item:nth-child(3) { border-color: rgba(205,127,50,0.4); }

.rank-num {
  font-family: var(--font-head);
  font-size: 1.2rem;
  font-weight: 800;
  width: 28px;
  text-align: center;
  color: var(--muted);
}
.classifica-item:first-child  .rank-num { color: var(--accent); }
.classifica-item:nth-child(2) .rank-num { color: #c0c0c0; }
.classifica-item:nth-child(3) .rank-num { color: #cd7f32; }

.rank-name {
  flex: 1;
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 600;
}
.rank-score {
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--green);
}
.rank-score.me { color: var(--accent); }

/* ─── Alert / message ──────────────────────────────────────── */
.alert {
  padding: 0.8rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  margin-bottom: 1rem;
}
.alert-error   { background: rgba(232,93,117,0.1);  border: 1px solid rgba(232,93,117,0.3);  color: #f59baa; }
.alert-success { background: rgba(62,207,142,0.1);  border: 1px solid rgba(62,207,142,0.3);  color: #5fdba5; }
.alert-info    { background: rgba(79,142,247,0.1);  border: 1px solid rgba(79,142,247,0.3);  color: #8ab4fa; }
.alert-waiting { background: rgba(245,166,35,0.08); border: 1px solid rgba(245,166,35,0.25); color: var(--accent); text-align: center; padding: 1.5rem; }

/* ─── Risposta radio ───────────────────────────────────────── */
.radio-group { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.radio-option {
  position: relative;
}
.radio-option input { position: absolute; opacity: 0; width: 0; height: 0; }
.radio-option label {
  display: flex; align-items: center; justify-content: center;
  width: 44px; height: 44px;
  border-radius: 8px;
  background: var(--surface2);
  border: 2px solid var(--border);
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  text-transform: uppercase;
  letter-spacing: 0;
  color: var(--text);
}
.radio-option input:checked + label {
  border-color: var(--green);
  background: rgba(62,207,142,0.12);
  color: var(--green);
}

/* ─── Waiting room (players list) ──────────────────────────── */
.players-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0;
}
.player-chip {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: 0.35rem 0.9rem;
  font-size: 0.9rem;
  font-weight: 500;
}

/* ─── Question image ───────────────────────────────────────── */
.question-img {
  width: 100%;
  max-height: 220px;
  object-fit: cover;
  border-radius: 10px;
  margin-bottom: 1rem;
}

/* ─── Nav back link ────────────────────────────────────────── */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  margin-bottom: 1.25rem;
  transition: color 0.2s;
}
.back-link:hover { color: var(--text); }

/* ─── Spinner ──────────────────────────────────────────────── */
.spinner {
  width: 24px; height: 24px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ─── Utilities ────────────────────────────────────────────── */
.text-center { text-align: center; }
.text-muted  { color: var(--muted); font-size: 0.9rem; }
.mt-1  { margin-top: 0.5rem; }
.mt-2  { margin-top: 1rem; }
.mt-3  { margin-top: 1.5rem; }
.mb-1  { margin-bottom: 0.5rem; }
.mb-2  { margin-bottom: 1rem; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.divider { border: none; border-top: 1px solid var(--border); margin: 1.25rem 0; }

/* ─── Responsive ───────────────────────────────────────────── */
@media (min-width: 480px) {
  .home-actions { max-width: 360px; }
  .page-content { padding: 2rem 1.5rem 3rem; }
}