:root {
  --feedback-blue: #2e65b8;
  --feedback-deep: #1e4f91;
  --feedback-ink: #344b61;
  --feedback-muted: #6f8191;
  --feedback-line: #dce4ec;
}

body {
  min-height: 100vh;
  color: var(--feedback-ink);
  background:
    radial-gradient(circle at 83% 8%, rgba(81, 139, 207, 0.13), transparent 26%),
    #f4f7fa;
}

.feedback-header-title {
  color: rgba(255, 255, 255, 0.9);
  font-size: 13px;
  font-weight: 600;
}

.feedback-back {
  margin-left: auto;
  color: rgba(255, 255, 255, 0.88);
  font-size: 12px;
}

.feedback-back:hover {
  color: white;
}

.feedback-page {
  width: min(720px, calc(100% - 28px));
  margin: 32px auto 52px;
}

.feedback-intro {
  margin-bottom: 16px;
  padding: 24px 26px;
  color: white;
  background:
    linear-gradient(115deg, rgba(25, 67, 126, 0.96), rgba(52, 107, 177, 0.9)),
    url("assets/campus-sunset.svg") center 55% / cover;
  border-radius: 5px;
  box-shadow: 0 8px 24px rgba(28, 58, 95, 0.14);
}

.feedback-kicker {
  display: inline-block;
  margin-bottom: 9px;
  padding: 3px 8px;
  color: rgba(255, 255, 255, 0.85);
  background: rgba(255, 255, 255, 0.13);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 2px;
  font-size: 10px;
  letter-spacing: 0.08em;
}

.feedback-intro h1 {
  margin: 0;
  font-family: "STSong", "SimSun", serif;
  font-size: 29px;
  font-weight: 700;
}

.feedback-intro p {
  max-width: 570px;
  margin: 9px 0 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: 12px;
  line-height: 1.75;
}

.feedback-card {
  padding: 22px 24px 24px;
  background: white;
  border: 1px solid var(--feedback-line);
  border-radius: 5px;
  box-shadow: 0 2px 8px rgba(28, 55, 83, 0.04);
}

.feedback-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 20px;
  padding-bottom: 15px;
  border-bottom: 1px solid #edf1f5;
}

.feedback-card-head h2 {
  margin: 0;
  color: #294a68;
  font-size: 18px;
}

.feedback-card-head span {
  display: block;
  margin-top: 4px;
  color: var(--feedback-muted);
  font-size: 11px;
}

.feedback-card-head .feedback-response {
  margin: 0;
  padding: 4px 8px;
  color: #4f7193;
  background: #f3f8fd;
  border: 1px solid #dce9f5;
  border-radius: 2px;
  white-space: nowrap;
}

#feedbackForm label {
  display: block;
  margin: 15px 0 6px;
  color: #4d6377;
  font-size: 12px;
  font-weight: 600;
}

#feedbackForm label:first-child {
  margin-top: 0;
}

#feedbackCategory,
#feedbackContent,
#feedbackContact {
  width: 100%;
  color: var(--feedback-ink);
  background: #f9fbfd;
  border: 1px solid #d6e0e9;
  border-radius: 3px;
  font: inherit;
  font-size: 13px;
  outline: 0;
}

#feedbackCategory,
#feedbackContact {
  height: 39px;
  padding: 0 11px;
}

#feedbackContent {
  min-height: 150px;
  padding: 10px 11px;
  line-height: 1.75;
  resize: vertical;
}

#feedbackCategory:focus,
#feedbackContent:focus,
#feedbackContact:focus {
  background: white;
  border-color: #78a5d3;
  box-shadow: 0 0 0 3px rgba(47, 102, 164, 0.09);
}

.feedback-field-meta {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-top: 5px;
  color: #8292a1;
  font-size: 10px;
}

.feedback-error {
  min-height: 18px;
  margin: 12px 0 7px;
  color: #b45749;
  font-size: 11px;
}

.feedback-submit,
.feedback-success button {
  height: 40px;
  padding: 0 24px;
  color: white;
  background: var(--feedback-blue);
  border: 1px solid var(--feedback-deep);
  border-radius: 3px;
  font-size: 13px;
  font-weight: 600;
}

.feedback-submit {
  width: 100%;
}

.feedback-submit:hover,
.feedback-success button:hover {
  background: var(--feedback-deep);
}

.feedback-submit:disabled {
  opacity: 0.65;
  cursor: wait;
}

.feedback-success {
  padding: 28px 10px 16px;
  text-align: center;
}

.feedback-success-mark {
  display: grid;
  width: 48px;
  height: 48px;
  margin: 0 auto 13px;
  color: #24835c;
  background: #eaf8f1;
  border: 1px solid #bde3d0;
  border-radius: 50%;
  font-size: 24px;
  place-items: center;
}

.feedback-success h2 {
  margin: 0;
  color: #294a68;
  font-size: 20px;
}

.feedback-success p {
  margin: 7px 0;
  color: #687b8c;
  font-size: 12px;
}

.feedback-success strong {
  color: #315f94;
  font-family: Georgia, serif;
  letter-spacing: 0.08em;
}

.feedback-success button {
  margin-top: 14px;
}

.feedback-privacy {
  margin: 13px 4px 0;
  color: #7c8c9a;
  font-size: 10px;
  line-height: 1.7;
  text-align: center;
}

@media (max-width: 680px) {
  .feedback-page {
    width: calc(100% - 18px);
    margin: 13px auto 28px;
  }

  .feedback-intro {
    padding: 20px 17px;
  }

  .feedback-intro h1 {
    font-size: 24px;
  }

  .feedback-card {
    padding: 17px 14px 18px;
  }

  .feedback-card-head {
    display: block;
  }

  .feedback-card-head .feedback-response {
    display: inline-block;
    margin-top: 8px;
  }

  .feedback-back {
    font-size: 11px;
  }
}