:root {
  color-scheme: dark;
  --bg: #06080d;
  --panel: rgba(12, 18, 30, 0.82);
  --line: rgba(128, 242, 255, 0.22);
  --cyan: #61f4ff;
  --lime: #b7ff5a;
  --pink: #ff5edb;
  --text: #eefaff;
  --muted: #93a9b8;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
  overflow: hidden;
}

body {
  min-height: 100vh;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 16% 16%, rgba(97, 244, 255, 0.22), transparent 26%),
    radial-gradient(circle at 84% 28%, rgba(255, 94, 219, 0.2), transparent 24%),
    linear-gradient(135deg, #030509 0%, #0b1020 46%, #05070c 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(to bottom, transparent, black 18%, black 82%, transparent);
}

.shell {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(360px, 1.1fr);
  gap: clamp(22px, 4vw, 58px);
  align-items: center;
  width: min(1180px, calc(100vw - 40px));
  height: 100vh;
  margin: 0 auto;
  padding: clamp(20px, 3vw, 38px) 0;
}

.intro {
  min-width: 0;
}

.eyebrow {
  width: fit-content;
  margin: 0 0 18px;
  padding: 8px 12px;
  border: 1px solid rgba(97, 244, 255, 0.36);
  color: var(--cyan);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  background: rgba(97, 244, 255, 0.08);
}

h1 {
  max-width: 12ch;
  margin: 0;
  font-size: clamp(2.3rem, 5vw, 4.4rem);
  line-height: 0.98;
  letter-spacing: 0;
}

.subtitle {
  max-width: 520px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: clamp(0.98rem, 1.7vw, 1.2rem);
  line-height: 1.55;
}

.calculator {
  position: relative;
  min-width: 0;
  padding: clamp(18px, 3vw, 32px);
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(97, 244, 255, 0.1), transparent 32%),
    linear-gradient(315deg, rgba(183, 255, 90, 0.1), transparent 34%),
    var(--panel);
  box-shadow: 0 22px 80px rgba(0, 0, 0, 0.42), inset 0 0 44px rgba(97, 244, 255, 0.06);
  backdrop-filter: blur(18px);
}

.calculator::before,
.calculator::after {
  content: "";
  position: absolute;
  width: 44px;
  height: 44px;
  border-color: var(--cyan);
  border-style: solid;
  pointer-events: none;
}

.calculator::before {
  top: -1px;
  left: -1px;
  border-width: 2px 0 0 2px;
}

.calculator::after {
  right: -1px;
  bottom: -1px;
  border-width: 0 2px 2px 0;
}

.form-grid {
  display: grid;
  gap: 14px;
}

.field {
  display: grid;
  gap: 9px;
}

.field span {
  color: #bfd2de;
  font-size: 0.86rem;
  font-weight: 700;
}

input {
  width: 100%;
  min-height: 56px;
  border: 1px solid rgba(147, 169, 184, 0.26);
  border-radius: 0;
  padding: 0 16px;
  color: var(--text);
  font: inherit;
  font-size: 1.32rem;
  font-weight: 800;
  background: rgba(3, 8, 15, 0.72);
  outline: none;
  box-shadow: inset 0 0 22px rgba(0, 0, 0, 0.24);
}

input:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(97, 244, 255, 0.15), inset 0 0 22px rgba(0, 0, 0, 0.24);
}

.result-panel {
  display: grid;
  gap: 18px;
  margin-top: 20px;
  padding: clamp(16px, 2.5vw, 24px);
  border: 1px solid rgba(183, 255, 90, 0.34);
  background: linear-gradient(135deg, rgba(183, 255, 90, 0.16), rgba(255, 94, 219, 0.08));
}

.result-label {
  display: block;
  margin-bottom: 6px;
  color: var(--lime);
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
}

#totalCost {
  display: block;
  font-size: clamp(2.2rem, 6vw, 4.9rem);
  line-height: 0.95;
  color: var(--lime);
  text-shadow: 0 0 28px rgba(183, 255, 90, 0.3);
}

.stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.stats span {
  min-width: 0;
  padding: 12px;
  border: 1px solid rgba(97, 244, 255, 0.2);
  color: var(--muted);
  background: rgba(5, 10, 17, 0.54);
  font-size: 0.9rem;
}

.stats b {
  display: block;
  margin-bottom: 3px;
  color: var(--cyan);
  font-size: 1.08rem;
}

@media (max-width: 760px) {
  .shell {
    grid-template-columns: 1fr;
    gap: 16px;
    width: min(100vw - 24px, 560px);
    padding: 14px 0;
    align-content: center;
  }

  h1 {
    max-width: 13ch;
    font-size: clamp(2rem, 12vw, 3rem);
  }

  .subtitle {
    margin-top: 12px;
    font-size: 0.92rem;
    line-height: 1.35;
  }

  .eyebrow {
    margin-bottom: 10px;
    padding: 6px 10px;
  }

  .calculator {
    padding: 16px;
  }

  input {
    min-height: 48px;
    font-size: 1.1rem;
  }

  .result-panel {
    margin-top: 14px;
    gap: 12px;
  }

  .stats {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media (max-height: 620px) {
  .shell {
    gap: 14px;
    padding: 10px 0;
  }

  .subtitle {
    display: none;
  }

  .field {
    gap: 5px;
  }

  .form-grid {
    gap: 9px;
  }

  input {
    min-height: 44px;
  }

  .result-panel {
    margin-top: 10px;
    padding: 14px;
  }
}