:root {
  --bg: #f1f5f9;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --accent: #0d9488;
  --accent2: #2563eb;
  --accent-soft: #ccfbf1;
  --chip-bg: #eef2f7;
  --shadow: 0 1px 3px rgba(15, 23, 42, .08);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --card: #111a2e;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --border: #1e293b;
    --accent: #14b8a6;
    --accent2: #60a5fa;
    --accent-soft: #134e4a;
    --chip-bg: #1e293b;
  }
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.4;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.app {
  max-width: 560px;
  margin: 0 auto;
  padding: calc(env(safe-area-inset-top) + 20px) 16px calc(env(safe-area-inset-bottom) + 24px);
}

h1 { font-size: 26px; margin: 0 0 4px; letter-spacing: -0.02em; }
.sub { color: var(--muted); font-size: 14px; margin: 0 0 22px; }

section { margin-bottom: 22px; }
label {
  display: block; font-size: 13px; font-weight: 600; color: var(--muted);
  text-transform: uppercase; letter-spacing: .04em; margin-bottom: 8px;
}

/* Segmented control */
.segmented { display: flex; background: var(--chip-bg); border-radius: 12px; padding: 4px; gap: 4px; }
.segmented button {
  flex: 1; border: 0; background: transparent; color: var(--text);
  font-size: 16px; font-weight: 600; padding: 12px 8px; border-radius: 9px;
  cursor: pointer; transition: background .15s, color .15s;
}
.segmented button.active { background: var(--accent); color: #fff; }

/* Quick chips */
.chips {
  display: flex; flex-wrap: wrap; gap: 8px; padding: 2px 2px 10px;
}
.chip {
  flex: 0 0 auto; border: 1px solid var(--border); background: var(--card); color: var(--text);
  font-size: 15px; font-weight: 600; padding: 10px 14px; border-radius: 20px; cursor: pointer;
  min-width: 46px; text-align: center;
}
.chip.active { background: var(--accent); border-color: var(--accent); color: #fff; }

input[type="text"] {
  width: 100%; font-size: 22px; font-weight: 600; padding: 14px 16px;
  border: 1.5px solid var(--border); border-radius: 12px; background: var(--card); color: var(--text);
  outline: none; -webkit-appearance: none; appearance: none;
}
input[type="text"]:focus { border-color: var(--accent2); box-shadow: 0 0 0 3px rgba(37, 99, 235, .15); }

/* Ergebnis */
.result { background: var(--card); border: 1px solid var(--border); border-radius: 18px; padding: 20px; box-shadow: var(--shadow); }
.hint { color: var(--muted); text-align: center; margin: 6px 0; }
.result__head { display: flex; gap: 10px; margin-bottom: 20px; }
.stat { flex: 1; text-align: center; padding: 10px 4px; background: var(--bg); border-radius: 12px; }
.stat__label { display: block; font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }
.stat__value { display: block; font-size: 16px; font-weight: 700; margin-top: 3px; }

.big { text-align: center; margin-bottom: 18px; }
.big__label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 4px; }
.big__value {
  font-size: 56px; font-weight: 800; letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--accent2), var(--accent));
  -webkit-background-clip: text; background-clip: text; color: transparent;
  line-height: 1.05;
}
.big__sub { display: block; font-size: 14px; color: var(--muted); margin-top: 4px; }

/* Bereichs-Grafik */
.rangebar { margin: 18px 0 8px; }
.rangebar__track {
  position: relative; height: 12px; border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  opacity: .25;
}
.rangebar__marker {
  position: absolute; top: -5px; height: 22px; width: 4px; border-radius: 2px;
  background: var(--accent2); transform: translateX(-50%);
  box-shadow: 0 0 0 2px var(--card);
}
.rangebar__labels { display: flex; justify-content: space-between; margin-top: 8px; }
.lbl { text-align: left; }
.lbl.center { text-align: center; flex: 1; }
.lbl.right { text-align: right; }
.lbl .val { display: block; font-size: 15px; font-weight: 700; }
.lbl .kg { display: block; font-size: 11px; color: var(--muted); }

.range-text { text-align: center; color: var(--muted); font-size: 13px; margin-top: 10px; }

/* PEEP */
.peep {
  margin-top: 18px; text-align: center; padding: 16px; border-radius: 14px;
  background: var(--accent-soft); border: 1px solid var(--accent);
}
.peep__val { font-size: 34px; font-weight: 800; color: var(--accent); }
.peep__label { font-size: 12px; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); margin-top: 2px; }
.peep__note { font-size: 13px; margin-top: 6px; color: var(--text); }

.disclaimer { color: var(--muted); font-size: 12px; line-height: 1.5; margin-top: 18px; }

/* Nachschlage */
.reference { margin-top: 10px; }
.reference h2 { font-size: 20px; margin: 0 0 12px; letter-spacing: -0.02em; }
.reference details {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  margin-bottom: 10px; overflow: hidden;
}
.reference summary {
  padding: 14px 16px; font-weight: 700; font-size: 15px; cursor: pointer;
  list-style: none; display: flex; justify-content: space-between; align-items: center;
  -webkit-tap-highlight-color: transparent; user-select: none;
}
.reference summary::-webkit-details-marker { display: none; }
.reference summary::after { content: "▾"; color: var(--muted); font-size: 14px; transition: transform .15s; }
.reference details[open] summary::after { transform: rotate(180deg); }
.ref-body { padding: 0 16px 16px; border-top: 1px solid var(--border); }
.ref-body p { margin: 10px 0; font-size: 14px; }
.ref-body ul, .ref-body ol { margin: 8px 0; padding-left: 20px; }
.ref-body li { margin-bottom: 8px; font-size: 14px; line-height: 1.5; }
.ref-body code { background: var(--chip-bg); padding: 1px 5px; border-radius: 5px; font-size: 13px; }
.refs li { font-size: 13px; color: var(--muted); }
.src { font-size: 12px; color: var(--muted); font-style: italic; }