:root {
  --bg:        #f5f5f7;
  --surface:   #ffffff;
  --surface2:  #f0f0f2;
  --text:      #1d1d1f;
  --text2:     #6e6e73;
  --accent:    #e2001a;   /* Bosch red */
  --accent-bg: #fdeaec;
  --green:     #1a7f37;
  --green-bg:  #e7f6ec;
  --amber:     #8a6d00;
  --amber-bg:  #fcf3d6;
  --border:    rgba(0,0,0,0.10);
  --shadow-sm: 0 1px 4px rgba(0,0,0,0.06);
  --shadow:    0 2px 12px rgba(0,0,0,0.08);
  --r-sm: 8px; --r: 12px; --r-lg: 16px; --r-pill: 100px;
  --ease: 0.18s ease;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 3px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg); color: var(--text); line-height: 1.45;
  min-height: 100vh; display: flex; flex-direction: column;
}
.hidden { display: none !important; }

/* Header */
.hdr {
  background: var(--surface); border-bottom: 1px solid var(--border);
  padding: 16px 20px; box-shadow: var(--shadow-sm);
}
.hdr-brand h1 { font-size: 1.25rem; font-weight: 700; letter-spacing: -0.02em; }
.hdr-brand p  { font-size: 0.82rem; color: var(--text2); margin-top: 2px; }

/* Layout */
.app { flex: 1; width: 100%; max-width: 860px; margin: 0 auto; padding: 20px 16px 48px; }
.step { margin-top: 28px; }
.step:first-child { margin-top: 8px; }
.step-title { font-size: 1.05rem; font-weight: 650; margin-bottom: 14px; display: flex; align-items: center; gap: 10px; }
.step-num {
  display: inline-grid; place-items: center;
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent); color: #fff; font-size: 0.85rem; font-weight: 700;
}

/* Campaign cards */
.campaign-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.campaign-card {
  text-align: left; background: var(--surface); border: 1.5px solid var(--border);
  border-radius: var(--r); padding: 16px; cursor: pointer; transition: all var(--ease);
  display: flex; flex-direction: column; gap: 6px;
}
.campaign-card:hover { border-color: var(--accent); box-shadow: var(--shadow); transform: translateY(-1px); }
.campaign-card.active { border-color: var(--accent); background: var(--accent-bg); }
.campaign-card h3 { font-size: 0.98rem; font-weight: 650; }
.campaign-card .cc-tiers { font-size: 0.8rem; color: var(--text2); }
.campaign-card .cc-period { font-size: 0.72rem; color: var(--text2); margin-top: auto; }
.cc-badge { align-self: flex-start; font-size: 0.68rem; font-weight: 600; padding: 2px 8px; border-radius: var(--r-pill); background: var(--surface2); color: var(--text2); }

/* Notes */
.note { border-radius: var(--r); padding: 12px 14px; font-size: 0.86rem; }
.note-info { background: var(--accent-bg); border: 1px solid rgba(226,0,26,0.18); color: #7a0010; }
.note a { color: inherit; font-weight: 600; }

/* Account row */
.account-row { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; margin: 14px 0; }
.account-label { font-size: 0.85rem; font-weight: 550; }
.seg { display: inline-flex; background: var(--surface2); border-radius: var(--r-pill); padding: 3px; }
.seg-btn {
  border: none; background: transparent; cursor: pointer;
  padding: 6px 14px; border-radius: var(--r-pill); font-size: 0.82rem; font-weight: 550;
  color: var(--text2); transition: all var(--ease);
}
.seg-btn.active { background: var(--surface); color: var(--text); box-shadow: var(--shadow-sm); }
.limit-note { font-size: 0.78rem; color: var(--text2); }
.limit-note a { color: var(--accent); }

/* Product table */
.products-head, .product-row {
  display: grid; grid-template-columns: 1fr 150px 40px; gap: 10px; align-items: center;
}
.products-head { font-size: 0.75rem; color: var(--text2); font-weight: 600; text-transform: uppercase; letter-spacing: 0.03em; padding: 0 2px 6px; }
.product-row { margin-bottom: 8px; }
.product-row input {
  width: 100%; border: 1.5px solid var(--border); border-radius: var(--r-sm);
  padding: 9px 11px; font-size: 0.9rem; background: var(--surface); color: var(--text);
  transition: border-color var(--ease);
}
.product-row input:focus { outline: none; border-color: var(--accent); }
.product-row input.amount { text-align: right; }
.btn-del {
  border: none; background: var(--surface2); color: var(--text2); cursor: pointer;
  width: 32px; height: 32px; border-radius: var(--r-sm); font-size: 1.1rem; line-height: 1;
  transition: all var(--ease);
}
.btn-del:hover { background: var(--accent-bg); color: var(--accent); }

.products-foot { display: flex; align-items: center; justify-content: space-between; margin-top: 6px; }
.btn { border: none; border-radius: var(--r-pill); padding: 8px 16px; font-size: 0.85rem; font-weight: 600; cursor: pointer; transition: all var(--ease); }
.btn-ghost { background: var(--surface2); color: var(--text); }
.btn-ghost:hover { background: var(--accent-bg); color: var(--accent); }
.total { font-size: 0.9rem; color: var(--text2); }
.total strong { color: var(--text); font-size: 1rem; }

/* Tier bar (live highlight) */
.tier-bar { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.tier-chip {
  display: flex; flex-direction: column; gap: 2px;
  border: 1.5px solid var(--border); border-radius: var(--r); padding: 8px 12px;
  font-size: 0.8rem; min-width: 120px; background: var(--surface); transition: all var(--ease);
}
.tier-chip .tc-name { font-weight: 650; }
.tier-chip .tc-thr { color: var(--text2); font-size: 0.74rem; }
.tier-chip.reached { border-color: var(--green); background: var(--green-bg); }
.tier-chip.reached .tc-name { color: var(--green); }

/* Results */
.result-card {
  background: var(--surface); border: 1.5px solid var(--border); border-radius: var(--r-lg);
  padding: 16px; margin-bottom: 14px; box-shadow: var(--shadow-sm);
}
.result-card.best { border-color: var(--green); box-shadow: 0 0 0 1px var(--green); }
.rc-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 6px; }
.rc-title { font-weight: 700; font-size: 1rem; }
.rc-best-badge { font-size: 0.7rem; font-weight: 700; color: #fff; background: var(--green); padding: 2px 9px; border-radius: var(--r-pill); }
.rc-sub { font-size: 0.8rem; color: var(--text2); margin-bottom: 10px; }
.group {
  border-top: 1px solid var(--border); padding-top: 10px; margin-top: 10px;
}
.group:first-of-type { border-top: none; padding-top: 0; margin-top: 0; }
.group-head { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.group-cat { font-weight: 650; font-size: 0.9rem; }
.group-sum { font-size: 0.82rem; color: var(--green); font-weight: 600; }
.group-products { list-style: none; margin: 6px 0 0; font-size: 0.85rem; color: var(--text2); }
.group-products li { display: flex; justify-content: space-between; gap: 12px; padding: 1px 0; }
.group-products li span:first-child { min-width: 0; overflow-wrap: anywhere; }
.group-products li span:last-child { flex-shrink: 0; white-space: nowrap; }
.group-rewards { margin: 8px 0 0; padding-left: 18px; font-size: 0.82rem; }
.group-rewards li { color: var(--text); }
.rc-leftover { margin-top: 10px; font-size: 0.8rem; color: var(--text2); font-style: italic; }
.empty { color: var(--text2); font-size: 0.9rem; padding: 8px 0; }

/* Hints */
.hints { margin-top: 14px; display: flex; flex-direction: column; gap: 8px; }
.hint {
  background: var(--amber-bg); border: 1px solid rgba(138,109,0,0.2); color: var(--amber);
  border-radius: var(--r); padding: 10px 13px; font-size: 0.84rem;
}
.hint strong { color: #5e4a00; }

/* Footer */
.ftr { border-top: 1px solid var(--border); padding: 18px 16px; text-align: center; }
.ftr p { font-size: 0.78rem; color: var(--text2); max-width: 700px; margin: 0 auto; }
.ftr a { color: var(--accent); }

@media (max-width: 600px) {
  .app { padding: 16px 12px 40px; }
  .step { margin-top: 22px; }

  /* Pola formularza: 16px zapobiega auto-zoomowi przy fokusie na iOS */
  .product-row input { font-size: 16px; padding: 11px; }
  .products-head, .product-row { grid-template-columns: 1fr 108px 40px; gap: 8px; }
  .btn-del { width: 40px; height: 40px; } /* wygodniejszy cel dotyku */

  .products-foot { flex-direction: column; align-items: stretch; gap: 10px; }
  .products-foot .btn { width: 100%; padding: 12px 16px; }
  .total { text-align: right; }

  .account-row { gap: 8px; }
  .account-label { width: 100%; }
  .limit-note { width: 100%; }

  .tier-chip { flex: 1 1 auto; min-width: 100px; }

  .group-products { font-size: 0.88rem; }
  .rc-title { font-size: 0.98rem; }
}

@media (max-width: 360px) {
  .products-head { display: none; } /* etykiety kolumn zabierają zbyt dużo miejsca */
  .products-head, .product-row { grid-template-columns: 1fr 92px 40px; }
}