:root {
  --bg-top: #fff6eb;
  --bg-bottom: #d9ece8;
  --orb-teal: rgba(15, 118, 110, 0.26);
  --orb-orange: rgba(194, 65, 12, 0.18);
  --card-bg: rgba(255, 255, 255, 0.82);
  --text-main: #1f2937;
  --text-sub: #4b5563;
  --accent: #0f766e;
  --accent-press: #0c5f59;
  --line: rgba(15, 23, 42, 0.12);
  --ok: #047857;
  --error: #b91c1c;
  --radius-lg: 28px;
  --radius-md: 16px;
  --shadow: 0 24px 60px rgba(15, 23, 42, 0.16);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  min-height: 100svh;
  font-family: "SF Pro Rounded", "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Helvetica Neue", sans-serif;
  color: var(--text-main);
  background: linear-gradient(165deg, var(--bg-top), var(--bg-bottom));
  overflow-x: hidden;
}

.bg-orb {
  position: fixed;
  width: 64vmin;
  aspect-ratio: 1;
  filter: blur(50px);
  border-radius: 999px;
  pointer-events: none;
}

.bg-orb-left {
  background: var(--orb-orange);
  top: -18vmin;
  left: -20vmin;
}

.bg-orb-right {
  background: var(--orb-teal);
  right: -20vmin;
  bottom: -20vmin;
}

.app-shell {
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding:
    calc(18px + env(safe-area-inset-top))
    18px
    calc(18px + env(safe-area-inset-bottom));
}

.card {
  width: min(100%, 560px);
  background: var(--card-bg);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
  padding: 22px;
  transform: translateY(8px);
  opacity: 0;
  animation: rise 420ms ease-out 120ms forwards;
}

.eyebrow {
  margin: 0;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #065f46;
  font-size: 0.78rem;
  font-weight: 700;
}

h1 {
  margin: 10px 0 8px;
  font-size: clamp(1.45rem, 5.5vw, 2rem);
  line-height: 1.2;
}

.subtitle {
  margin: 0;
  color: var(--text-sub);
  font-size: 0.95rem;
}

.input-group {
  margin-top: 20px;
}

.input-group label {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 0.9rem;
  color: var(--text-sub);
}

.input-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}

#dayInput {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.9);
  padding: 13px 14px;
  font-size: 1.1rem;
  color: var(--text-main);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

#dayInput:focus {
  outline: none;
  border-color: rgba(15, 118, 110, 0.8);
  box-shadow: 0 0 0 4px rgba(15, 118, 110, 0.15);
}

#calcBtn {
  border: 0;
  border-radius: var(--radius-md);
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 0.98rem;
  min-width: 84px;
  padding: 0 16px;
  transition: transform 0.12s ease, background-color 0.12s ease;
}

#calcBtn:active {
  transform: translateY(1px) scale(0.98);
  background: var(--accent-press);
}

.hint {
  margin: 8px 2px 0;
  color: #6b7280;
  font-size: 0.84rem;
}

.chips {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  border: 1px solid rgba(15, 118, 110, 0.28);
  background: rgba(255, 255, 255, 0.76);
  color: #0f766e;
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 0.86rem;
  font-weight: 600;
}

.chip:active {
  transform: translateY(1px);
}

.result {
  margin-top: 18px;
  border: 1px solid rgba(15, 118, 110, 0.16);
  border-radius: 20px;
  padding: 15px;
  background: rgba(255, 255, 255, 0.86);
  transition: transform 0.28s ease, box-shadow 0.28s ease;
}

.result.active {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(15, 118, 110, 0.16);
}

.result-date {
  margin: 0;
  font-size: clamp(1.26rem, 4.6vw, 1.58rem);
  font-weight: 700;
  letter-spacing: 0.01em;
}

.result-weekday,
.result-offset {
  margin: 6px 0 0;
  color: var(--text-sub);
  font-size: 1rem;
}

.status {
  margin: 15px 0 0;
  font-size: 0.84rem;
  color: #065f46;
}

.status.error {
  color: var(--error);
}

@media (min-width: 720px) {
  .card {
    padding: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}

@keyframes rise {
  from {
    transform: translateY(10px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}