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

:root {
  --ink: #1a1208;
  --paper: #f5f0e8;
  --cream: #ede7d6;
  --gold: #c9963a;
  --gold-light: #e8bf7a;
  --rust: #8b3a1a;
  --shadow: rgba(26, 18, 8, 0.15);
}

body {
  min-height: 100vh;
  background: var(--paper);
  background-image:
    radial-gradient(
      ellipse at 20% 20%,
      rgba(201, 150, 58, 0.08) 0%,
      transparent 50%
    ),
    radial-gradient(
      ellipse at 80% 80%,
      rgba(139, 58, 26, 0.06) 0%,
      transparent 50%
    ),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='4' height='4'%3E%3Crect width='4' height='4' fill='%23f5f0e8'/%3E%3Ccircle cx='1' cy='1' r='0.5' fill='rgba(26,18,8,0.04)'/%3E%3C/svg%3E");
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-family: "DM Mono", monospace;
  padding: 2rem 1rem;
  color: var(--ink);
}

.wrapper {
  width: 100%;
  max-width: 520px;
  animation: fadeUp 0.7s ease both;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Header ── */
.header {
  text-align: center;
  margin-bottom: 2.4rem;
}
.header .eyebrow {
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 0.5rem;
}
.header h1 {
  font-family: "Playfair Display", serif;
  font-size: clamp(2rem, 6vw, 2.8rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--ink);
}
.header h1 em {
  font-style: italic;
  color: var(--rust);
}
.divider {
  margin: 1rem auto 0;
  width: 48px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

/* ── Card ── */
.card {
  background: #fff;
  border: 1px solid rgba(201, 150, 58, 0.25);
  border-radius: 4px;
  padding: 2.2rem 2.4rem;
  box-shadow:
    0 2px 6px var(--shadow),
    0 12px 40px rgba(26, 18, 8, 0.07);
  position: relative;
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--rust), var(--gold), var(--rust));
}

/* ── Input row ── */
.input-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1.4fr;
  gap: 0.9rem;
  margin-bottom: 1.6rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

label {
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}

input[type="number"] {
  width: 100%;
  padding: 0.65rem 0.8rem;
  background: var(--cream);
  border: 1px solid rgba(201, 150, 58, 0.3);
  border-radius: 3px;
  font-family: "DM Mono", monospace;
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--ink);
  outline: none;
  transition:
    border-color 0.2s,
    box-shadow 0.2s;
  -moz-appearance: textfield;
  appearance: textfield;
}
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
}
input[type="number"]:focus {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(201, 150, 58, 0.12);
}
input.error {
  border-color: var(--rust) !important;
}

/* ── Error message ── */
.error-msg {
  font-size: 0.72rem;
  color: var(--rust);
  min-height: 1.1em;
  margin-bottom: 1rem;
  margin-top: -0.6rem;
  transition: opacity 0.2s;
}

/* ── Button ── */
button {
  width: 100%;
  padding: 0.9rem;
  background: var(--ink);
  color: var(--gold-light);
  border: none;
  border-radius: 3px;
  font-family: "DM Mono", monospace;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  cursor: pointer;
  transition:
    background 0.2s,
    transform 0.1s,
    box-shadow 0.2s;
  position: relative;
  overflow: hidden;
}
button::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.05) 0%,
    transparent 100%
  );
}
button:hover {
  background: #2e2010;
  box-shadow: 0 4px 16px rgba(26, 18, 8, 0.2);
}
button:active {
  transform: translateY(1px);
}

/* ── Result ── */
.result {
  margin-top: 1.8rem;
  border-top: 1px solid rgba(201, 150, 58, 0.2);
  padding-top: 1.6rem;
  display: none;
  animation: revealResult 0.5s ease both;
}
.result.show {
  display: block;
}

@keyframes revealResult {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.result-label {
  font-size: 0.6rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--gold);
  text-align: center;
  margin-bottom: 1.1rem;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.8rem;
}

.result-block {
  background: var(--cream);
  border: 1px solid rgba(201, 150, 58, 0.18);
  border-radius: 3px;
  padding: 1rem 0.5rem 0.8rem;
  text-align: center;
}

.result-block .num {
  font-family: "Playfair Display", serif;
  font-size: clamp(1.8rem, 5vw, 2.4rem);
  font-weight: 700;
  color: var(--ink);
  line-height: 1;
  display: block;
  counter-reset: none;
}
.result-block .num.counting {
  animation: countUp 0.4s ease both;
}
@keyframes countUp {
  from {
    transform: translateY(6px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.result-block .unit {
  display: block;
  font-size: 0.58rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
  margin-top: 0.35rem;
}

/* birthday banner */
.birthday-banner {
  margin-top: 1.2rem;
  padding: 0.65rem 1rem;
  background: linear-gradient(135deg, #fffbe8, #fff8e0);
  border: 1px solid rgba(201, 150, 58, 0.35);
  border-radius: 3px;
  text-align: center;
  font-size: 0.72rem;
  color: var(--rust);
  letter-spacing: 0.05em;
  display: none;
}
.birthday-banner.show {
  display: block;
  animation: revealResult 0.4s 0.3s ease both;
  opacity: 0;
  animation-fill-mode: both;
}

/* ── Footer ── */
.footer {
  text-align: center;
  margin-top: 1.6rem;
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(26, 18, 8, 0.3);
}
.footer a {
  color: var(--gold);
  text-decoration: none;
  transition: color 0.2s;
}
.footer a:hover {
  color: var(--rust);
}