:root {
  --ink: #07142d;
  --blue: #0869ed;
  --cyan: #19d8ff;
  --sky: #e6f2ff;
  --muted: #5c6c88;
  --line: rgba(12, 42, 91, .16);
  --font-sans: "Avenir Next", "Helvetica Neue", "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
}

* { box-sizing: border-box; }
html { color: var(--ink); background: #fff; font-family: var(--font-sans); }
body { margin: 0; background: #fff; line-height: 1.75; }
input, textarea, select, button { font: inherit; }
:focus-visible { outline: 3px solid var(--cyan); outline-offset: 3px; }

.mailform-shell { width: 100%; margin: 0; padding: 0 2px 4px; }
.mailform-errors:empty { display: none; }
.mailform-errors:not(:empty) {
  margin-bottom: 24px; padding: 14px 16px; color: #9d1530; background: #fff2f4;
  border: 1px solid rgba(157, 21, 48, .2); border-radius: 12px; font-size: .8rem;
}
.mailform-errors ul { margin: 0; padding-left: 1.3em; }

.mailform-table { display: block; width: 100%; border-collapse: collapse; }
.mailform-table tbody, .mailform-table tr, .mailform-table th, .mailform-table td { display: block; width: 100%; }
.mailform-table tr { padding: 0 0 24px; }
.mailform-table th {
  padding: 0 0 8px; border: 0; color: var(--ink); background: transparent;
  text-align: left; font-size: .75rem; font-weight: 800;
}
.mailform-table td { padding: 0; border: 0; color: var(--ink); }
.mailform-table input[type="text"],
.mailform-table input[type="email"],
.mailform-table input[type="tel"],
.mailform-table input:not([type]),
.mailform-table textarea,
.mailform-table select {
  width: 100%; min-height: 52px; padding: 12px 14px; color: var(--ink); background: #f8fbff;
  border: 1px solid var(--line); border-radius: 12px; font-size: 16px;
}
.mailform-table textarea { min-height: 180px; resize: vertical; }
.mailform-table input:focus, .mailform-table textarea:focus, .mailform-table select:focus {
  border-color: var(--blue); outline: 3px solid rgba(25, 216, 255, .28); outline-offset: 1px;
}
.mailform-table font[color="red"], .mailform-table .required { color: var(--blue) !important; }

.mailform-actions { display: grid; gap: 10px; margin-top: 8px; }
.mailform-actions input[type="submit"], .mailform-back {
  display: flex; justify-content: center; align-items: center; width: 100%; min-height: 62px;
  padding: 0 24px; color: #fff; background: var(--ink); border: 0; border-radius: 999px;
  cursor: pointer; text-align: center; text-decoration: none; font-size: .8rem; font-weight: 900;
}
.mailform-actions input[type="submit"]:hover, .mailform-back:hover { background: var(--blue); }
.mailform-actions .button-secondary { color: var(--ink); background: var(--sky); }
.mailform-actions .button-secondary:hover { color: #fff; }

.mailform-status { margin-bottom: 28px; padding: 24px; background: linear-gradient(145deg, var(--sky), #fff); border-radius: 18px; }
.mailform-status span { color: var(--blue); letter-spacing: .16em; font-size: .62rem; font-weight: 900; }
.mailform-status h2 { margin: 10px 0 8px; font-size: clamp(1.35rem, 5vw, 2rem); line-height: 1.35; }
.mailform-status p { margin: 0; color: var(--muted); font-size: .78rem; }
.mailform-shell--complete { display: grid; min-height: 420px; place-items: center; }
.mailform-status--complete { width: 100%; margin: 0; padding: clamp(28px, 7vw, 48px); text-align: center; }
.mailform-status--complete .mailform-back { max-width: 360px; margin: 30px auto 0; }
.mailform-table--confirm td { padding: 12px 14px; background: #f8fbff; border-radius: 12px; overflow-wrap: anywhere; }

@media (max-width: 520px) {
  .mailform-table tr { padding-bottom: 20px; }
  .mailform-actions input[type="submit"], .mailform-back { min-height: 58px; }
  .mailform-status { padding: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}