:root {
  color: #1c1c1c;
  background: #e9e9e4;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; }
a { color: inherit; text-underline-offset: 3px; }

.feedback-shell {
  width: min(820px, calc(100% - 40px));
  margin: 32px auto;
  overflow: hidden;
  border: 1px solid #d4d4ce;
  border-radius: 12px;
  background: #f7f7f5;
  box-shadow: 0 18px 48px rgba(31, 31, 27, 0.1);
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 0 40px;
  border-bottom: 1px solid #dcdcd7;
  color: #55554f;
  font-size: .85rem;
}

.brand { color: #1c1c1c; font-size: 1rem; font-weight: 700; text-decoration: none; }
.feedback-content { padding: 70px 40px 90px; }
.label { margin: 0 0 14px; color: #666660; font-size: .76rem; font-weight: 700; letter-spacing: .12em; }
h1 { max-width: 650px; margin: 0; font-size: clamp(2.8rem, 8vw, 4.8rem); line-height: .98; letter-spacing: -.055em; }
.intro { max-width: 560px; margin: 20px 0 42px; color: #595954; font-size: 1.05rem; line-height: 1.6; }

form { display: grid; gap: 24px; }
.subject-card { display: flex; justify-content: space-between; gap: 20px; padding: 18px 20px; border: 1px solid #dcdcd7; border-radius: 8px; background: #fff; }
.subject-card span { color: #777770; }
.subject-card strong { text-align: right; }
.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
label { display: grid; gap: 8px; color: #3f3f3b; font-size: .88rem; font-weight: 650; }
input, textarea { width: 100%; border: 1px solid #c8c8c1; border-radius: 7px; background: #fff; color: #1c1c1c; font: inherit; font-weight: 400; }
input { min-height: 46px; padding: 0 13px; }
textarea { padding: 13px; resize: vertical; line-height: 1.5; }
input:focus, textarea:focus { outline: 3px solid rgba(28, 28, 28, .14); border-color: #1c1c1c; }
button { width: fit-content; border: 0; border-radius: 6px; background: #1c1c1c; color: #fff; padding: 14px 20px; font: inherit; font-weight: 700; cursor: pointer; }
button:hover { background: #3a3a36; }
.form-note { margin: -10px 0 0; color: #73736d; font-size: .78rem; line-height: 1.5; }
.website-field { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.notice { margin-bottom: 24px; padding: 14px 16px; border-radius: 7px; line-height: 1.5; }
.notice.success { border: 1px solid #7ab48e; background: #edf8f0; }
.notice.error { border: 1px solid #cf8b82; background: #fff0ee; }

@media (max-width: 620px) {
  .feedback-shell { width: calc(100% - 20px); margin: 10px auto; border-radius: 9px; }
  header { padding: 0 22px; }
  .feedback-content { padding: 52px 22px 65px; }
  .field-grid { grid-template-columns: 1fr; }
  .subject-card { flex-direction: column; gap: 6px; }
  .subject-card strong { text-align: left; }
}