/* BMI Calculator Pro — Futuristic Dark UI */
@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=DM+Mono:wght@300;400;500&display=swap');

:root {
  --bmi-bg: #060a10;
  --bmi-card: #0d1422;
  --bmi-card2: #0f1829;
  --bmi-border: rgba(99,179,237,0.1);
  --bmi-accent: #38bdf8;
  --bmi-accent2: #818cf8;
  --bmi-accent3: #34d399;
  --bmi-danger: #f87171;
  --bmi-warn: #fbbf24;
  --bmi-text: #e2e8f0;
  --bmi-muted: #64748b;
  --bmi-glow: rgba(56,189,248,0.2);
  --bmi-radius: 18px;
  --bmi-font: 'Syne', sans-serif;
  --bmi-mono: 'DM Mono', monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

.bmi-wrapper {
  font-family: var(--bmi-font);
  background: var(--bmi-bg);
  background-image:
    radial-gradient(ellipse at 15% 0%, rgba(56,189,248,0.07) 0%, transparent 55%),
    radial-gradient(ellipse at 85% 100%, rgba(129,140,248,0.07) 0%, transparent 55%);
  padding: 40px 24px;
  border-radius: 24px;
  position: relative;
  overflow: hidden;
  max-width: 700px;
  margin: 0 auto;
}

.bmi-wrapper::before {
  content: '';
  position: absolute; inset: 0;
  background:
    repeating-linear-gradient(0deg, transparent, transparent 39px, rgba(56,189,248,0.025) 40px),
    repeating-linear-gradient(90deg, transparent, transparent 39px, rgba(56,189,248,0.025) 40px);
  pointer-events: none;
}

/* Header */
.bmi-header { text-align: center; margin-bottom: 32px; position: relative; }
.bmi-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 60px; height: 60px;
  background: linear-gradient(135deg, rgba(56,189,248,0.18), rgba(129,140,248,0.18));
  border: 1px solid rgba(56,189,248,0.22); border-radius: 18px;
  margin-bottom: 14px; font-size: 28px;
  box-shadow: 0 0 32px var(--bmi-glow);
}
.bmi-header h2 {
  font-size: 30px; font-weight: 800;
  color: var(--bmi-text); letter-spacing: -0.5px; margin-bottom: 6px;
}
.bmi-header p {
  font-family: var(--bmi-mono); font-size: 11px;
  color: var(--bmi-muted); letter-spacing: 2px; text-transform: uppercase;
}

/* Unit Toggle */
.bmi-unit-toggle {
  display: flex;
  background: var(--bmi-card);
  border: 1px solid var(--bmi-border);
  border-radius: 12px; padding: 4px;
  width: fit-content; margin: 0 auto 28px; gap: 3px;
}
.bmi-unit-toggle button {
  font-family: var(--bmi-font); font-size: 13px; font-weight: 700;
  padding: 9px 22px; border: none; border-radius: 9px;
  cursor: pointer; transition: all 0.25s;
  background: transparent; color: var(--bmi-muted); letter-spacing: 0.3px;
}
.bmi-unit-toggle button.active {
  background: linear-gradient(135deg, var(--bmi-accent), var(--bmi-accent2));
  color: #fff; box-shadow: 0 4px 18px rgba(56,189,248,0.28);
}

/* Inputs */
.bmi-inputs {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 14px; margin-bottom: 20px;
}
@media (max-width: 500px) {
  .bmi-inputs { grid-template-columns: 1fr; }
  .bmi-wrapper { padding: 28px 16px; }
}
.bmi-field {
  background: var(--bmi-card);
  border: 1px solid var(--bmi-border);
  border-radius: var(--bmi-radius); padding: 18px 20px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.bmi-field:focus-within {
  border-color: rgba(56,189,248,0.35);
  box-shadow: 0 0 0 3px rgba(56,189,248,0.07);
}
.bmi-field label {
  display: block; font-family: var(--bmi-mono);
  font-size: 10px; letter-spacing: 2px;
  text-transform: uppercase; color: var(--bmi-muted); margin-bottom: 10px;
}
.bmi-field-input-row { display: flex; align-items: center; gap: 8px; }
.bmi-field input[type="number"] {
  font-family: var(--bmi-mono); font-size: 28px; font-weight: 500;
  color: var(--bmi-text); background: transparent;
  border: none; outline: none; width: 100%; min-width: 0;
  -moz-appearance: textfield;
}
.bmi-field input[type="number"]::-webkit-outer-spin-button,
.bmi-field input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; }
.bmi-unit-label {
  font-family: var(--bmi-mono); font-size: 13px;
  color: var(--bmi-accent); white-space: nowrap; flex-shrink: 0;
}
.bmi-slider-wrap { margin-top: 10px; }
.bmi-slider {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 4px; border-radius: 2px;
  background: rgba(56,189,248,0.12); outline: none; cursor: pointer;
}
.bmi-slider::-webkit-slider-thumb {
  -webkit-appearance: none; width: 18px; height: 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--bmi-accent), var(--bmi-accent2));
  box-shadow: 0 0 10px var(--bmi-glow);
  cursor: pointer; transition: transform 0.15s;
}
.bmi-slider::-webkit-slider-thumb:hover { transform: scale(1.2); }

/* Button */
.bmi-btn {
  width: 100%; padding: 18px;
  font-family: var(--bmi-font); font-size: 16px; font-weight: 700;
  letter-spacing: 0.5px; border: none; border-radius: var(--bmi-radius);
  background: linear-gradient(135deg, var(--bmi-accent), var(--bmi-accent2));
  color: #fff; cursor: pointer; transition: all 0.3s;
  position: relative; overflow: hidden;
  box-shadow: 0 8px 30px rgba(56,189,248,0.28);
  margin-bottom: 24px;
}
.bmi-btn::before {
  content: ''; position: absolute; top: 0; left: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
  transition: left 0.5s;
}
.bmi-btn:hover::before { left: 100%; }
.bmi-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(56,189,248,0.38); }
.bmi-btn:active { transform: translateY(0); }

/* Error */
.bmi-error {
  font-family: var(--bmi-mono); font-size: 12px;
  color: var(--bmi-danger); margin: -16px 0 16px;
  padding: 10px 14px;
  background: rgba(248,113,113,0.07);
  border: 1px solid rgba(248,113,113,0.2);
  border-radius: 10px; display: none;
}

/* Result Panel */
.bmi-result {
  background: var(--bmi-card2);
  border: 1px solid var(--bmi-border);
  border-radius: var(--bmi-radius); padding: 28px;
  opacity: 0; transform: translateY(16px);
  transition: opacity 0.45s ease, transform 0.45s ease;
  display: none;
}
.bmi-result.visible { opacity: 1; transform: translateY(0); }

.bmi-result-top {
  display: flex; align-items: center;
  justify-content: space-between;
  margin-bottom: 20px; flex-wrap: wrap; gap: 12px;
}
.bmi-result-score {
  font-family: var(--bmi-mono); font-size: 68px; font-weight: 500; line-height: 1;
  background: linear-gradient(135deg, var(--bmi-accent), var(--bmi-accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.bmi-result-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 18px; border-radius: 100px;
  font-family: var(--bmi-font); font-size: 13px; font-weight: 700; letter-spacing: 0.5px;
}
.bmi-result-badge.underweight { background: rgba(56,189,248,0.12);  color: var(--bmi-accent);  border: 1px solid rgba(56,189,248,0.25); }
.bmi-result-badge.normal      { background: rgba(52,211,153,0.12);  color: var(--bmi-accent3); border: 1px solid rgba(52,211,153,0.25); }
.bmi-result-badge.overweight  { background: rgba(251,191,36,0.12);  color: var(--bmi-warn);    border: 1px solid rgba(251,191,36,0.25); }
.bmi-result-badge.obese       { background: rgba(248,113,113,0.12); color: var(--bmi-danger);  border: 1px solid rgba(248,113,113,0.25); }

/* Scale */
.bmi-scale { margin: 18px 0 24px; }
.bmi-scale-track {
  height: 10px; border-radius: 5px;
  background: linear-gradient(to right,
    #38bdf8 0%, #38bdf8 18.5%,
    #34d399 18.5%, #34d399 37%,
    #fbbf24 37%, #fbbf24 62.5%,
    #f87171 62.5%, #f87171 100%);
  position: relative; margin-bottom: 10px;
}
.bmi-scale-pointer {
  position: absolute; top: 50%; transform: translate(-50%, -50%);
  width: 20px; height: 20px; background: #fff; border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(255,255,255,0.25), 0 4px 14px rgba(0,0,0,0.5);
  transition: left 0.75s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.bmi-scale-labels {
  display: flex; justify-content: space-between;
  font-family: var(--bmi-mono); font-size: 10px;
  color: var(--bmi-muted); line-height: 1.5;
}

/* ═══ Recommendations ═══ */
.bmi-recommendations { margin-top: 24px; }

.bmi-rec-title {
  font-family: var(--bmi-mono); font-size: 10px; letter-spacing: 2.5px;
  text-transform: uppercase; color: var(--bmi-muted);
  margin-bottom: 14px;
  display: flex; align-items: center; gap: 10px;
}
.bmi-rec-title::after { content: ''; flex: 1; height: 1px; background: var(--bmi-border); }

.bmi-rec-cards {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
}
@media (max-width: 500px) { .bmi-rec-cards { grid-template-columns: 1fr; } }

.bmi-rec-card {
  border-radius: 14px; padding: 20px;
  position: relative; overflow: hidden;
  border: 1px solid transparent;
  transition: transform 0.2s, box-shadow 0.2s;
  animation: recSlideUp 0.5s ease both;
}
.bmi-rec-card:nth-child(2) { animation-delay: 0.07s; }
.bmi-rec-card:nth-child(3) { animation-delay: 0.14s; }
.bmi-rec-card:nth-child(4) { animation-delay: 0.21s; }
.bmi-rec-card:hover { transform: translateY(-3px); }

@keyframes recSlideUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

.bmi-rec-card.steps    { background: linear-gradient(135deg,rgba(56,189,248,0.09),rgba(56,189,248,0.03));   border-color: rgba(56,189,248,0.2); }
.bmi-rec-card.calories { background: linear-gradient(135deg,rgba(251,191,36,0.09),rgba(251,191,36,0.03));   border-color: rgba(251,191,36,0.2); }
.bmi-rec-card.water    { background: linear-gradient(135deg,rgba(129,140,248,0.09),rgba(129,140,248,0.03)); border-color: rgba(129,140,248,0.2); }
.bmi-rec-card.tip      {
  background: linear-gradient(135deg,rgba(52,211,153,0.07),rgba(52,211,153,0.02));
  border-color: rgba(52,211,153,0.2);
  grid-column: span 2;
}
@media (max-width: 500px) { .bmi-rec-card.tip { grid-column: span 1; } }

.bmi-rec-card.steps:hover    { box-shadow: 0 8px 28px rgba(56,189,248,0.14); }
.bmi-rec-card.calories:hover { box-shadow: 0 8px 28px rgba(251,191,36,0.14); }
.bmi-rec-card.water:hover    { box-shadow: 0 8px 28px rgba(129,140,248,0.14); }
.bmi-rec-card.tip:hover      { box-shadow: 0 8px 28px rgba(52,211,153,0.12); }

.bmi-rec-emoji  { font-size: 28px; margin-bottom: 12px; display: block; }
.bmi-rec-label  {
  font-family: var(--bmi-mono); font-size: 10px; letter-spacing: 1.5px;
  text-transform: uppercase; color: var(--bmi-muted); margin-bottom: 6px;
}
.bmi-rec-value  {
  font-family: var(--bmi-mono); font-size: 26px; font-weight: 500; line-height: 1; margin-bottom: 4px;
}
.bmi-rec-sub    { font-family: var(--bmi-mono); font-size: 11px; color: var(--bmi-muted); margin-top: 3px; }

.bmi-rec-card.steps .bmi-rec-value    { color: var(--bmi-accent); }
.bmi-rec-card.calories .bmi-rec-value { color: var(--bmi-warn); }
.bmi-rec-card.water .bmi-rec-value    { color: var(--bmi-accent2); }
.bmi-rec-card.tip .bmi-rec-value {
  color: var(--bmi-accent3);
  font-size: 13px; line-height: 1.65;
  font-family: var(--bmi-font); font-weight: 400;
}

.bmi-mini-bar { margin-top: 14px; height: 3px; border-radius: 2px; background: rgba(255,255,255,0.06); overflow: hidden; }
.bmi-mini-bar-fill { height: 100%; border-radius: 2px; width: 0; transition: width 1.1s cubic-bezier(0.4,0,0.2,1); }
.bmi-rec-card.steps .bmi-mini-bar-fill    { background: var(--bmi-accent); }
.bmi-rec-card.calories .bmi-mini-bar-fill { background: var(--bmi-warn); }
.bmi-rec-card.water .bmi-mini-bar-fill    { background: var(--bmi-accent2); }