:root {
  --ink: #24332c;
  --paper: #f4eddd;
  --paper-light: #fffaf0;
  --clay: #b94f32;
  --moss: #315e4b;
  --line: rgba(36, 51, 44, 0.16);
  --cream: #fff8e8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100svh;
  font-family:
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC",
    sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
}

a {
  color: inherit;
  text-decoration: none;
}

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  height: 72px;
  padding: 0 clamp(20px, 5vw, 72px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(36, 51, 44, 0.1);
  background: rgba(244, 237, 221, 0.92);
  backdrop-filter: blur(10px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  font-size: 15px;
}

.nav {
  display: flex;
  gap: 24px;
  font-size: 14px;
}

.nav a:hover {
  color: var(--clay);
}

.guestbook {
  width: min(820px, calc(100% - 40px));
  margin: 0 auto;
  padding: 124px 0 100px;
}

.kicker {
  margin: 0;
  color: var(--clay);
  font-size: 12px;
  font-weight: 800;
}

.intro h1 {
  margin: 12px 0 0;
  font-size: 62px;
  line-height: 1.1;
}

.intro > p:last-child {
  max-width: 600px;
  margin: 20px 0 0;
  color: rgba(36, 51, 44, 0.72);
  font-size: 17px;
}

.compose {
  margin-top: 56px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper-light);
  box-shadow: 0 18px 50px rgba(70, 55, 31, 0.08);
}

.compose h2,
.wall h2 {
  margin: 0;
  font-size: 28px;
}

form {
  display: grid;
  gap: 18px;
  margin-top: 24px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: rgba(36, 51, 44, 0.76);
  font-size: 13px;
  font-weight: 700;
}

input,
textarea {
  width: 100%;
  border: 1px solid rgba(36, 51, 44, 0.2);
  border-radius: 8px;
  padding: 12px 14px;
  background: #fffdf7;
  color: var(--ink);
  font: inherit;
  font-size: 15px;
  outline: none;
}

textarea {
  min-height: 132px;
  resize: vertical;
}

input:focus,
textarea:focus {
  border-color: var(--moss);
  box-shadow: 0 0 0 3px rgba(49, 94, 75, 0.1);
}

input::placeholder,
textarea::placeholder {
  color: rgba(36, 51, 44, 0.38);
}

.honeypot {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.form-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.form-foot p {
  min-height: 24px;
  margin: 0;
  color: var(--clay);
  font-size: 13px;
}

button {
  border: 0;
  border-radius: 8px;
  padding: 12px 19px;
  background: var(--moss);
  color: var(--cream);
  font: inherit;
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
}

button:hover {
  background: #264c3d;
}

button:disabled {
  cursor: wait;
  opacity: 0.62;
}

.wall {
  margin-top: 70px;
}

.wall-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.reload {
  padding: 8px 14px;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink);
  font-size: 13px;
}

.reload:hover {
  background: var(--paper-light);
}

.messages {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.message {
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 250, 240, 0.68);
}

.message-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
}

.message strong {
  overflow-wrap: anywhere;
}

.message time {
  flex: 0 0 auto;
  color: rgba(36, 51, 44, 0.52);
  font-size: 12px;
}

.message p {
  margin: 12px 0 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.empty {
  margin: 0;
  padding: 32px 0;
  color: rgba(36, 51, 44, 0.58);
  text-align: center;
}

@media (max-width: 620px) {
  .guestbook {
    width: min(100% - 24px, 820px);
    padding-top: 104px;
  }

  .intro h1 {
    font-size: 42px;
  }

  .compose {
    padding: 22px 18px;
  }

  .form-foot {
    align-items: flex-start;
    flex-direction: column;
  }

  .form-foot button {
    width: 100%;
  }

  .message-head {
    align-items: flex-start;
    flex-direction: column;
    gap: 4px;
  }
}

@media (max-width: 420px) {
  .brand span:last-child {
    display: none;
  }

  .nav {
    gap: 12px;
    font-size: 13px;
  }
}