:root {
  color-scheme: light;
  --background: #f4f7f9;
  --surface: #ffffff;
  --text: #1f2933;
  --muted: #64707d;
  --line: #d8e0e7;
  --primary: #176b62;
  --primary-hover: #11574f;
  --primary-soft: #e9f5f2;
  --danger: #b42318;
  --danger-soft: #fff1f0;
  --success: #157347;
  --success-soft: #edf8f2;
  --focus: #8acbc3;
  font-family: "Yu Gothic UI", "Hiragino Sans", Meiryo, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at top left, #e5f2f0 0, transparent 35rem),
    var(--background);
}

button,
input,
textarea {
  font: inherit;
}

.page {
  width: min(100% - 32px, 760px);
  margin: 0 auto;
  padding: 56px 0;
}

.form-card {
  padding: clamp(24px, 5vw, 48px);
  border: 1px solid rgba(216, 224, 231, 0.8);
  border-radius: 20px;
  background: var(--surface);
  box-shadow: 0 18px 55px rgba(31, 41, 51, 0.08);
}

.form-header {
  margin-bottom: 36px;
}

.form-header h1 {
  margin: 6px 0 12px;
  font-size: clamp(1.7rem, 5vw, 2.35rem);
  letter-spacing: 0.02em;
}

.form-header p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.eyebrow {
  color: var(--primary) !important;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
}

.field,
.attachment-field {
  margin: 0 0 26px;
}

.field label,
.attachment-field legend {
  display: block;
  margin-bottom: 9px;
  font-weight: 700;
}

.attachment-field {
  min-width: 0;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 14px;
  color: var(--text);
  background: #fff;
  transition: border-color 0.2s, box-shadow 0.2s;
}

textarea {
  resize: vertical;
}

input:focus,
textarea:focus,
button:focus-visible,
.file-picker:focus-visible {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--focus);
}

.required-mark {
  color: var(--danger);
}

.help-text {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

.file-picker {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 18px;
  border: 1px solid var(--primary);
  border-radius: 9px;
  color: var(--primary);
  background: var(--primary-soft);
  font-weight: 700;
  cursor: pointer;
}

.file-summary {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.file-summary p {
  margin: 0;
}

.file-summary ul {
  margin: 8px 0 0;
  padding-left: 1.4rem;
}

.file-summary li + li {
  margin-top: 6px;
}

.button {
  min-height: 46px;
  border-radius: 10px;
  padding: 11px 20px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s, opacity 0.2s, transform 0.2s;
}

.button:hover:not(:disabled) {
  transform: translateY(-1px);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.65;
}

.button-primary {
  width: 100%;
  border: 1px solid var(--primary);
  color: #fff;
  background: var(--primary);
}

.button-primary:hover:not(:disabled) {
  background: var(--primary-hover);
}

.button-secondary {
  margin-top: 14px;
  border: 1px solid var(--line);
  color: var(--text);
  background: #fff;
  font-size: 0.9rem;
}

.message {
  margin-bottom: 24px;
  border-radius: 10px;
  padding: 13px 15px;
  line-height: 1.6;
}

.message-error {
  border: 1px solid #f2b8b5;
  color: var(--danger);
  background: var(--danger-soft);
}

.message-success {
  border: 1px solid #a7d7bd;
  color: var(--success);
  background: var(--success-soft);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 540px) {
  .page {
    width: min(100% - 20px, 760px);
    padding: 20px 0;
  }

  .form-card {
    border-radius: 14px;
  }

  .attachment-field {
    padding: 18px;
  }
}