* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: #08090a;
}

body {
  min-height: 100svh;
  margin: 0;
  display: grid;
  place-items: center;
  padding: max(20px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) max(20px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
  color: #f7f8f8;
  background: radial-gradient(circle at 50% 0%, rgba(94, 106, 210, 0.25), transparent 34rem), linear-gradient(180deg, #101116 0%, #08090a 58%);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input {
  font: inherit;
}

.app-shell {
  width: min(100vw - 32px, 440px);
}

.calculator-card {
  width: 100%;
  padding: clamp(24px, 6vw, 40px);
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.055);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(18px);
}

.hero-copy {
  text-align: center;
  margin-bottom: 28px;
}

.eyebrow {
  margin: 0 0 10px;
  color: #c5c9ff;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 9vw, 3rem);
  line-height: 0.98;
  letter-spacing: -0.055em;
  text-wrap: balance;
}

.subtitle {
  margin: 16px auto 0;
  max-width: 30ch;
  color: #9aa1ad;
  font-size: clamp(1rem, 4vw, 1.1rem);
  line-height: 1.55;
}

.calculator {
  display: grid;
  gap: 16px;
}

.field {
  display: grid;
  gap: 8px;
}
.field > span {
  color: #d7d9df;
  font-size: 0.95rem;
  font-weight: 600;
}

input[type=date] {
  -webkit-appearance: none;
  appearance: none;
  text-align: center;
  font-size: 1.12rem;
  line-height: 56px;
  min-height: 56px;
  height: 56px;
}
input[type=date]::-webkit-date-and-time-value {
  min-width: 0;
  text-align: center;
}

input {
  display: block;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  min-height: 56px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 16px;
  outline: none;
  padding: 0 16px;
  color: #f7f8f8;
  background: rgba(255, 255, 255, 0.075);
  font-size: 1.12rem;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}
input:focus {
  border-color: rgba(115, 124, 255, 0.85);
  box-shadow: 0 0 0 4px rgba(94, 106, 210, 0.22);
}
input[readonly] {
  color: #ffffff;
  font-size: clamp(1.35rem, 7vw, 1.8rem);
  font-weight: 700;
  letter-spacing: -0.04em;
}

.input-prefix {
  position: relative;
}
.input-prefix > span {
  position: absolute;
  left: 16px;
  top: 50%;
  color: #9aa1ad;
  transform: translateY(-50%);
  pointer-events: none;
}
.input-prefix input {
  padding-left: 34px;
}

.copy-button {
  min-height: 58px;
  margin-top: 4px;
  border: 0;
  border-radius: 18px;
  color: #ffffff;
  background: linear-gradient(135deg, #5e6ad2, #737cff);
  cursor: pointer;
  font-size: 1.05rem;
  font-weight: 700;
  box-shadow: 0 16px 34px rgba(94, 106, 210, 0.28);
}
.copy-button:active {
  transform: translateY(1px);
}

.helper-text {
  margin: 18px 0 0;
  color: #9aa1ad;
  text-align: center;
  font-size: 0.9rem;
}

@media (max-width: 420px) {
  body {
    align-items: stretch;
  }
  .app-shell {
    display: grid;
    align-items: center;
  }
  .calculator-card {
    padding: 22px;
    border-radius: 22px;
  }
}