:root {
  --color-primary: #d62828;
  --color-primary-dark: #9d0208;
  --color-accent: #2a9d8f;
  --color-warm: #f77f00;
  --color-bg: #fafaf7;
  --color-card: #ffffff;
  --color-text: #1d1d1d;
  --color-muted: #6c6c6c;
  --color-border: #e5e5e5;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --radius: 10px;
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-base); font-size: 16px; line-height: 1.6; color: var(--color-text); background: var(--color-bg); }
header { background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-warm) 100%); color: white; box-shadow: var(--shadow-md); position: sticky; top: 0; z-index: 100; }
.nav-container { max-width: 1200px; margin: 0 auto; padding: 0.9rem 1.5rem; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1rem; }
.brand { font-size: 1.4rem; font-weight: 700; color: white; text-decoration: none; display: flex; align-items: center; gap: 0.5rem; }
nav ul { list-style: none; display: flex; gap: 0.4rem; flex-wrap: wrap; }
nav a { color: white; text-decoration: none; padding: 0.5rem 1rem; border-radius: 6px; font-weight: 500; transition: background 0.2s; }
nav a:hover, nav a.active { background: rgba(255,255,255,0.2); }
main { max-width: 1100px; margin: 0 auto; padding: 2rem 1.5rem; }
.hero { text-align: center; padding: 3rem 1rem 2rem; background: linear-gradient(180deg, rgba(214,40,40,0.05) 0%, transparent 100%); border-radius: var(--radius); margin-bottom: 2rem; }
.hero h1 { font-size: 2.4rem; margin-bottom: 0.8rem; color: var(--color-primary-dark); }
.hero p.lead { font-size: 1.15rem; color: var(--color-muted); max-width: 700px; margin: 0 auto; }
h1 { font-size: 2rem; margin-bottom: 1rem; color: var(--color-primary-dark); }
h2 { font-size: 1.5rem; margin: 1.8rem 0 0.8rem; color: var(--color-text); }
h3 { font-size: 1.2rem; margin: 1.2rem 0 0.5rem; color: var(--color-text); }
p { margin-bottom: 1rem; }
a { color: var(--color-primary); }
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.2rem; margin: 1.5rem 0; }
.card { background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 1.4rem; box-shadow: var(--shadow-sm); transition: transform 0.15s, box-shadow 0.15s; }
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.card h3 { margin-top: 0; color: var(--color-primary); }
table { width: 100%; border-collapse: collapse; margin: 1rem 0; background: white; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }
th, td { padding: 0.75rem 1rem; text-align: left; border-bottom: 1px solid var(--color-border); }
th { background: var(--color-primary); color: white; font-weight: 600; }
tr:last-child td { border-bottom: none; }
tr:nth-child(even) td { background: #fafafa; }
.zone { display: flex; align-items: center; gap: 1rem; padding: 1rem 1.2rem; border-radius: var(--radius); margin-bottom: 0.6rem; color: white; }
.zone-1 { background: #3a86ff; } .zone-2 { background: #2a9d8f; } .zone-3 { background: #f4a261; } .zone-4 { background: #e76f51; } .zone-5 { background: #9d0208; }
.zone-label { font-weight: 700; font-size: 1.05rem; min-width: 80px; }
.zone-range { font-family: monospace; font-size: 1.1rem; font-weight: 600; }
.zone-desc { flex: 1; font-size: 0.95rem; }
.calculator { background: white; padding: 1.5rem; border-radius: var(--radius); border: 1px solid var(--color-border); box-shadow: var(--shadow-sm); margin-bottom: 1.5rem; }
.form-row { display: flex; flex-wrap: wrap; gap: 1rem; align-items: end; margin-bottom: 1rem; }
.form-group { flex: 1; min-width: 140px; }
label { display: block; font-weight: 600; margin-bottom: 0.3rem; font-size: 0.9rem; color: var(--color-muted); }
input[type="number"], select { width: 100%; padding: 0.6rem 0.8rem; border: 1px solid var(--color-border); border-radius: 6px; font-size: 1rem; }
button { background: var(--color-primary); color: white; border: none; padding: 0.7rem 1.4rem; border-radius: 6px; font-size: 1rem; font-weight: 600; cursor: pointer; transition: background 0.2s; }
button:hover { background: var(--color-primary-dark); }
.filter-bar { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.5rem; }
.filter-chip { display: inline-flex; align-items: center; gap: 0.3rem; padding: 0.4rem 0.9rem; border: 2px solid var(--color-border); border-radius: 20px; background: white; cursor: pointer; font-size: 0.9rem; font-weight: 500; user-select: none; transition: all 0.15s; }
.filter-chip:hover { border-color: var(--color-accent); }
.filter-chip.active { background: var(--color-accent); border-color: var(--color-accent); color: white; }
.recipe-card { background: white; border: 1px solid var(--color-border); border-radius: var(--radius); padding: 1.3rem; display: flex; flex-direction: column; }
.recipe-card h3 { margin-top: 0; color: var(--color-primary-dark); }
.recipe-meta { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 0.8rem; }
.tag { background: #f1f4f3; color: var(--color-accent); padding: 0.15rem 0.6rem; border-radius: 12px; font-size: 0.75rem; font-weight: 600; text-transform: uppercase; }
.recipe-nutrition { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.5rem; margin: 0.8rem 0; padding: 0.7rem; background: #fafaf7; border-radius: 6px; text-align: center; }
.nutri-cell .val { display: block; font-weight: 700; font-size: 1.05rem; color: var(--color-primary); }
.nutri-cell .label { font-size: 0.7rem; color: var(--color-muted); text-transform: uppercase; }
.portion-control { display: flex; align-items: center; gap: 0.5rem; margin: 0.5rem 0 1rem; padding: 0.5rem; background: #fafaf7; border-radius: 6px; }
.portion-control button { width: 30px; height: 30px; padding: 0; font-size: 1.2rem; line-height: 1; }
.portion-control .portion-val { font-weight: 700; min-width: 30px; text-align: center; }
.ingredients-list { list-style: none; margin: 0.5rem 0; padding: 0; }
.ingredients-list li { padding: 0.3rem 0; border-bottom: 1px dashed #eee; font-size: 0.92rem; display: flex; justify-content: space-between; }
.ingredients-list li:last-child { border: none; }
.instructions { margin-top: 1rem; font-size: 0.92rem; color: var(--color-muted); white-space: pre-line; }
.notice { background: #fff3cd; border-left: 4px solid var(--color-warm); padding: 1rem 1.2rem; border-radius: 6px; margin: 1rem 0; font-size: 0.95rem; }
.notice-info { background: #e7f5f3; border-left-color: var(--color-accent); }
footer { background: #1d1d1d; color: #aaa; text-align: center; padding: 2rem 1rem; margin-top: 4rem; font-size: 0.9rem; }
.loading { text-align: center; padding: 2rem; color: var(--color-muted); }
.error { background: #fee; border-left: 4px solid var(--color-primary); padding: 1rem; border-radius: 6px; color: var(--color-primary-dark); }
@media (max-width: 640px) {
  .hero h1 { font-size: 1.7rem; }
  .zone { flex-direction: column; align-items: flex-start; gap: 0.3rem; }
  .recipe-nutrition { grid-template-columns: repeat(2, 1fr); }
}