:root {
  --bg: #0f1115;
  --card: #191c22;
  --card-border: #2a2e37;
  --accent: #ff5533;
  --accent-2: #33c9ff;
  --text: #eceff4;
  --text-muted: #9aa1ac;
  --success: #4caf50;
  --error: #ff6b6b;
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.hidden { display: none !important; }

/* ---------- AUTH ---------- */
#auth-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.auth-box {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 32px;
  width: 100%;
  max-width: 380px;
}

.auth-box h1 { margin: 0 0 4px; font-size: 24px; }
.subtitle { color: var(--text-muted); font-size: 14px; margin-bottom: 20px; }

.auth-form { display: flex; flex-direction: column; gap: 12px; }
.auth-form.hidden { display: none; }

/* ---------- GENERIC FORM ---------- */
input, select, textarea {
  background: #12141a;
  border: 1px solid var(--card-border);
  color: var(--text);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 14px;
  font-family: inherit;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
}

button {
  cursor: pointer;
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  font-family: inherit;
}

.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: #e14a2c; }
.btn-secondary { background: #262a33; color: var(--text); }
.btn-secondary:hover { background: #31353f; }

.error { color: var(--error); font-size: 13px; min-height: 18px; }
.success { color: var(--success); font-size: 13px; min-height: 18px; }

/* ---------- TABS ---------- */
.tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.auth-tabs { margin-bottom: 16px; }
.tab-btn {
  background: transparent;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  border-radius: 0;
  padding: 8px 14px;
}
.tab-btn.active { color: var(--text); border-bottom-color: var(--accent); }

.main-tabs {
  padding: 0 24px;
  border-bottom: 1px solid var(--card-border);
  background: #14161c;
}

.tab-panel { display: none; padding: 24px; max-width: 1000px; margin: 0 auto; }
.tab-panel.active { display: block; }

/* ---------- TOPBAR ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--card-border);
}
.topbar h1 { font-size: 18px; margin: 0; }
.topbar-right { display: flex; align-items: center; gap: 12px; }
#username-label { color: var(--text-muted); font-size: 14px; }

/* ---------- DASHBOARD ---------- */
.period-switch { display: flex; gap: 8px; margin-bottom: 20px; }
.period-btn {
  background: #1c1f26;
  color: var(--text-muted);
  border-radius: 20px;
  padding: 6px 16px;
}
.period-btn.active { background: var(--accent); color: white; }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}
.stat-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}
.stat-value { font-size: 26px; font-weight: 700; color: var(--accent-2); }
.stat-label { font-size: 12px; color: var(--text-muted); margin-top: 4px; text-transform: uppercase; letter-spacing: 0.5px; }

.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.chart-box {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 16px;
}
.chart-box h3 { margin: 0 0 12px; font-size: 14px; color: var(--text-muted); }

.ai-box {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 20px;
}
.ai-box-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; flex-wrap: wrap; gap: 10px; }
.ai-box-header h3 { margin: 0; }
.ai-comment-text { line-height: 1.6; color: var(--text); white-space: pre-wrap; }

/* ---------- WORKOUT FORM ---------- */
#workout-form { display: flex; flex-direction: column; gap: 14px; }
.form-row { display: flex; gap: 12px; flex-wrap: wrap; }
.form-row label, #workout-form > label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--text-muted); flex: 1; min-width: 160px; }
.hint { color: var(--text-muted); font-size: 13px; margin: -6px 0 4px; line-height: 1.5; }

/* ---------- BLOCCHI ALLENAMENTO ---------- */
.block-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 14px;
  margin-bottom: 14px;
}
.block-header {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 10px;
}
.block-header select.block-type { font-weight: 600; min-width: 170px; }
.block-header input { flex: 1; min-width: 90px; }
.block-meta-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 8px;
  margin-bottom: 10px;
}
.block-meta-row label { display: flex; flex-direction: column; gap: 4px; font-size: 12px; color: var(--text-muted); }
.remove-block-btn { background: transparent; color: var(--error); padding: 4px 10px; }

.movement-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr 1.5fr auto;
  gap: 8px;
  align-items: center;
  background: #12141a;
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 8px;
  margin-bottom: 6px;
}
.movement-row select, .movement-row input { width: 100%; }
.remove-mv-btn { background: transparent; color: var(--error); padding: 4px 8px; }
.add-movement-btn { background: #262a33; color: var(--text); font-size: 13px; padding: 6px 12px; }

.form-actions { display: flex; align-items: center; gap: 16px; }

/* ---------- STORICO A BLOCCHI ---------- */
.history-block { border-top: 1px solid var(--card-border); padding-top: 8px; margin-top: 8px; }
.history-block-header { display: flex; gap: 8px; align-items: baseline; flex-wrap: wrap; margin-bottom: 4px; }
.block-type-badge {
  background: var(--accent);
  color: white;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 2px 8px;
  border-radius: 10px;
}
.history-block-meta { color: var(--text-muted); font-size: 12px; }

/* ---------- HISTORY ---------- */
.search-input { width: 100%; margin-bottom: 16px; padding: 12px 14px; font-size: 14px; }
.history-list { display: flex; flex-direction: column; gap: 12px; }
.history-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 16px;
}
.history-card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.history-date { font-weight: 700; color: var(--accent-2); }
.history-title { color: var(--text-muted); font-size: 13px; }
.history-exercises { list-style: none; padding: 0; margin: 8px 0 0; font-size: 14px; }
.history-exercises li { padding: 4px 0; border-top: 1px solid var(--card-border); }
.delete-btn { background: transparent; color: var(--error); font-size: 13px; }

/* ---------- RECORD FORMS/LISTS ---------- */
.inline-form { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 8px; align-items: center; }
.inline-form select, .inline-form input { flex: 1; min-width: 120px; }
.checkbox-label { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--text-muted); }

.record-list { display: flex; flex-direction: column; gap: 8px; margin-top: 16px; }
.record-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 14px;
}
.record-item .record-main { font-weight: 600; }
.record-item .record-sub { color: var(--text-muted); font-size: 12px; }

@media (max-width: 640px) {
  .exercise-row { grid-template-columns: 1fr 1fr; }
  .main-tabs { padding: 0 12px; overflow-x: auto; }
  .tab-panel { padding: 16px; }
}