:root {
  --bg: #f4f6f5;
  --card-bg: #ffffff;
  --primary: #2e7d5b;
  --primary-dark: #1f5c41;
  --text: #1f2a24;
  --muted: #6b7a72;
  --border: #e1e6e3;
  --danger: #c0392b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.hidden { display: none !important; }

.view { min-height: 100vh; }

#program-view, #login-view {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.login-card {
  max-width: 380px;
  width: 100%;
  text-align: center;
}

h1 { margin: 0 0 6px; font-size: 1.5rem; }
.subtitle { color: var(--muted); margin: 0 0 20px; font-size: 0.92rem; }

label { display: block; text-align: left; font-size: 0.85rem; margin-bottom: 6px; color: var(--muted); }

input[type="text"], input[type="number"] {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  margin-bottom: 14px;
}

button {
  cursor: pointer;
  border: none;
  border-radius: 8px;
  padding: 12px 18px;
  font-size: 1rem;
  font-weight: 600;
}

#login-btn, #calc-needed-btn {
  background: var(--primary);
  color: white;
  width: 100%;
}

#login-btn:hover, #calc-needed-btn:hover { background: var(--primary-dark); }

.secondary-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

.full-width { width: 100%; margin-top: 10px; }

.program-btn {
  display: block;
  width: 100%;
  background: var(--primary);
  color: white;
  margin-bottom: 12px;
  padding: 14px 16px;
  line-height: 1.3;
}

.program-btn:hover { background: var(--primary-dark); }
.program-btn:last-child { margin-bottom: 0; }

.error { color: var(--danger); font-size: 0.88rem; }

.dashboard {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

.dashboard-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 16px;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 640px) {
  .grid { grid-template-columns: 1fr; }
  .dashboard-header { flex-direction: column; gap: 12px; }
}

.weight {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--primary);
  background: #e6f2ec;
  padding: 3px 8px;
  border-radius: 999px;
  vertical-align: middle;
  margin-left: 6px;
}

table { width: 100%; border-collapse: collapse; }
td { padding: 8px 0; border-bottom: 1px solid var(--border); font-size: 0.92rem; }
tr:last-child td { border-bottom: none; }
.num { text-align: right; font-weight: 600; }
.subtotal td { color: var(--muted); font-weight: 600; }

.highlight { text-align: center; }
.big-number { font-size: 2.6rem; font-weight: 700; color: var(--primary); }

.simulator input[type="range"] {
  width: 100%;
  margin: 12px 0 6px;
  accent-color: var(--primary);
}

.slider-label { font-size: 0.9rem; color: var(--muted); margin-bottom: 16px; }
.slider-label span { font-weight: 700; color: var(--text); }

.result-box {
  background: #f0f5f2;
  border-radius: 10px;
  padding: 14px 16px;
  margin-bottom: 18px;
}

.result-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  font-size: 0.95rem;
}

.result-row.final {
  font-size: 1.2rem;
  font-weight: 700;
  border-top: 1px solid var(--border);
  margin-top: 4px;
  padding-top: 10px;
  color: var(--primary-dark);
}

.reverse-calc {
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

.reverse-row { display: flex; gap: 10px; }
.reverse-row input { margin-bottom: 0; }
.reverse-row button { white-space: nowrap; }

#needed-result { margin-top: 12px; font-size: 0.95rem; font-weight: 600; }