:root {
  color-scheme: light dark;
  --bg: #f6f3ef;
  --bg-accent: #efe7dd;
  --card: #ffffff;
  --text: #1e1e24;
  --subtext: #4f4f57;
  --border: #d6c9b8;
  --primary: #2f6f6b;
  --primary-strong: #265a57;
  --danger: #c44343;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.12);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1c1e;
    --bg-accent: #252527;
    --card: #2b2b2f;
    --text: #ffffff;
    --subtext: #98989e;
    --border: #3b3b40;
    --primary: #6ec0b8;
    --primary-strong: #55a39c;
    --danger: #ff7b7b;
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", "Segoe UI", sans-serif;
  background: radial-gradient(1200px 600px at 10% 0%, var(--bg-accent), transparent 60%),
    radial-gradient(1000px 500px at 100% 10%, #d9e7e3, transparent 65%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

.hero {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 12px;
  color: var(--subtext);
  margin: 0 0 8px;
}

h1 {
  font-size: clamp(28px, 3vw, 40px);
  margin: 0 0 12px;
}

.lede {
  margin: 0;
  color: var(--subtext);
  max-width: 580px;
}


.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.card {
  background: var(--card);
  border-radius: 20px;
  padding: 22px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.card h2 {
  margin-top: 0;
  font-size: 20px;
}

.field {
  display: grid;
  gap: 8px;
  margin-bottom: 18px;
}

.field label {
  font-weight: 600;
}

input,
textarea,
button {
  font: inherit;
}

input,
textarea {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
  background: transparent;
  color: var(--text);
}

input:focus,
textarea:focus {
  outline: 2px solid rgba(110, 192, 184, 0.35);
  outline-offset: 2px;
}

textarea {
  width: 100%;
  min-height: 420px;
  resize: vertical;
  white-space: pre;
}

.fieldset {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
  margin-bottom: 18px;
}

.fieldset legend {
  padding: 0 6px;
  font-weight: 700;
  color: var(--subtext);
}

.bill-grid {
  display: grid;
  gap: 12px;
}

.bill-grid label {
  display: grid;
  gap: 6px;
}

.other-list {
  display: grid;
  gap: 12px;
  margin-bottom: 12px;
}

.other-row {
  display: grid;
  grid-template-columns: 88px minmax(0, 1.3fr) minmax(0, 1fr) auto;
  gap: 8px;
  align-items: center;
}

.other-row input,
.other-row select {
  width: 100%;
  min-width: 0;
}

.other-row .row-error {
  grid-column: 1 / -1;
  color: var(--danger);
  font-size: 12px;
  margin: 0;
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
  font-weight: 600;
}

button {
  border: none;
  border-radius: 999px;
  padding: 10px 18px;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

button.primary {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 12px 30px rgba(47, 111, 107, 0.3);
  font-weight: 700;
}

button.primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 36px rgba(47, 111, 107, 0.35);
}

button.ghost {
  background: transparent;
  border: 1px dashed var(--border);
  color: var(--subtext);
}

button.ghost.remove {
  padding: 8px 12px;
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 16px;
}

.action-row {
  display: flex;
  gap: 10px;
  align-items: center;
}

.error {
  color: var(--danger);
  font-size: 13px;
  margin: 0;
  min-height: 16px;
}

.hint {
  font-size: 12px;
  color: var(--subtext);
  margin: 10px 0 0;
}

.hidden {
  display: none;
}

.disabled-field {
  opacity: 0.55;
  filter: grayscale(0.2);
}

@media (max-width: 600px) {
  .hero {
    flex-direction: column;
    align-items: flex-start;
  }

  .other-row {
    grid-template-columns: 1fr;
  }

  button.primary {
    width: 100%;
  }
}