:root {
  --primary: #0b66c3;
  --primary-dark: #084e96;
  --danger: #d93025;
  --bg: #f2f5f9;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #d1d5db;
  --radius: 12px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}

.container {
  max-width: 480px;
  margin: 0 auto;
  padding: 16px 16px 48px;
}

.header {
  text-align: center;
  padding: 20px 8px 16px;
}

.header h1 {
  font-size: 1.35rem;
  color: var(--primary-dark);
}

.subtitle {
  margin-top: 6px;
  font-size: 0.85rem;
  color: var(--muted);
}

#reportForm {
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px 16px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.form-group {
  margin-bottom: 20px;
}

.form-group:last-of-type {
  margin-bottom: 28px;
}

label {
  display: block;
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 6px;
}

.required {
  margin-left: 6px;
  font-size: 0.7rem;
  font-weight: 600;
  color: #ffffff;
  background: var(--danger);
  border-radius: 4px;
  padding: 2px 6px;
  vertical-align: middle;
}

input[type="text"],
input[type="date"],
input[type="number"],
select {
  width: 100%;
  min-height: 52px;
  font-size: 1.05rem;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  appearance: none;
  -webkit-appearance: none;
}

input:focus,
select:focus {
  outline: 2px solid var(--primary);
  outline-offset: -1px;
  border-color: var(--primary);
}

select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%236b7280' stroke-width='2' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
}

input[type="date"] {
  min-height: 48px;
}

.hint {
  margin-top: 5px;
  font-size: 0.78rem;
  color: var(--muted);
}

.mileage-wrap {
  position: relative;
}

#mileage {
  padding-right: 44px;
}

.unit {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-54%);
  font-size: 0.95rem;
  color: var(--muted);
  pointer-events: none;
}

.submit-btn {
  width: 100%;
  min-height: 60px;
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  background: var(--primary);
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: background 0.2s;
}

.submit-btn:hover:not(:disabled) {
  background: var(--primary-dark);
}

.submit-btn:disabled {
  background: #9aa5b1;
  cursor: not-allowed;
}

.result-message {
  margin-top: 20px;
  padding: 14px 16px;
  border-radius: 10px;
  font-weight: 600;
  text-align: center;
  font-size: 0.95rem;
}

.result-message.success {
  background: #e6f4ea;
  color: #137333;
  border: 1px solid #b7dfd0;
}

.result-message.error {
  background: #fce8e6;
  color: var(--danger);
  border: 1px solid #f5b9b3;
}