/* ============================================================
   在线留言页（guestbook.html）
   与整站 editorial-light 体系一致：细分隔线、无卡片阴影
   ============================================================ */

.gb-section {
  padding: clamp(36px, 5vw, 72px) 0 clamp(48px, 6vw, 88px);
  border-bottom: 1px solid var(--line);
}

.gb-grid {
  display: grid;
  grid-template-columns: minmax(300px, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(32px, 5vw, 88px);
  align-items: start;
}

.gb-aside {
  position: sticky;
  top: 110px;
}

.gb-aside .compact-breadcrumb {
  margin-bottom: 26px;
}

.gb-aside h1 {
  margin-bottom: 18px;
  font-family: var(--serif);
  font-size: clamp(30px, 3.2vw, 44px);
  font-weight: 900;
  line-height: 1.15;
}

.gb-lede {
  max-width: 30em;
  color: var(--ink-soft);
  font-size: 15.5px;
  line-height: 1.8;
}

.gb-contact-lines {
  display: grid;
  gap: 0;
  margin-top: 28px;
  border-top: 1px solid var(--ink);
}

.gb-contact-lines > div {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.gb-line-label {
  display: block;
  margin-bottom: 6px;
  color: var(--blue);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.gb-phone {
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(24px, 2.2vw, 32px);
  font-weight: 700;
  border-bottom: 2px solid var(--blue);
  transition: color 180ms ease;
}

.gb-phone:hover {
  color: var(--blue);
}

.gb-contact-lines p {
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.7;
}

.gb-contact-lines p a {
  color: var(--blue);
  font-weight: 600;
}

.gb-wechat {
  display: flex;
  align-items: center;
  gap: 16px;
}

.gb-wechat img {
  width: 112px;
  height: auto;
  padding: 4px;
  background: #fff;
  border: 1px solid var(--line);
}

.gb-wechat p strong {
  color: var(--ink);
}

/* ---------- 表单 ---------- */

.gb-jump-form {
  display: none;
}

.gb-form-wrap {
  border-top: 1px solid var(--ink);
}

.gb-form-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0 18px;
  border-bottom: 1px solid var(--line);
}

.gb-form-title {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 700;
}

.gb-form-meta {
  color: var(--muted);
  font-size: 12.5px;
}

.gb-form-meta em {
  color: var(--blue);
  font-style: normal;
}

.gb-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px clamp(20px, 2.5vw, 36px);
  padding-top: 26px;
}

.gb-field {
  display: flex;
  flex-direction: column;
}

.gb-field-full {
  grid-column: 1 / -1;
}

.gb-field label {
  margin-bottom: 8px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
}

.gb-field label em {
  color: var(--blue);
  font-style: normal;
}

.gb-field input,
.gb-field textarea {
  width: 100%;
  padding: 12px 14px;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-radius: 0;
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.5;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.gb-field input:focus,
.gb-field textarea:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px var(--blue-wash);
}

.gb-field textarea {
  resize: vertical;
  min-height: 140px;
}

.gb-hint {
  margin-top: 6px;
  color: var(--muted);
  font-size: 12.5px;
}

.gb-submit-row {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 24px;
  align-items: center;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.gb-submit-row .button {
  min-width: 180px;
}

.gb-note {
  color: var(--muted);
  font-size: 12.5px;
}

/* ---------- 提交流程 ---------- */

.gb-flow {
  margin-top: clamp(28px, 3vw, 44px);
  padding-top: 20px;
  border-top: 1px solid var(--ink);
}

.gb-flow-title {
  margin-bottom: 16px;
  color: var(--blue);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.gb-flow-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px clamp(18px, 2vw, 28px);
}

.gb-flow-steps li {
  display: flex;
  gap: 12px;
}

.gb-flow-no {
  flex: 0 0 auto;
  padding-top: 3px;
  color: var(--muted);
  font-size: 11px;
}

.gb-flow-steps strong {
  display: block;
  margin-bottom: 4px;
  font-size: 14px;
  font-weight: 600;
}

.gb-flow-steps p {
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.7;
}

/* ---------- 响应式 ---------- */

@media (max-width: 1080px) {
  .gb-grid {
    grid-template-columns: 1fr;
  }

  .gb-aside {
    position: static;
  }

  .gb-jump-form {
    display: inline-flex;
    align-items: center;
    margin-top: 22px;
    padding: 11px 20px;
    color: var(--paper);
    background: var(--ink);
    border: 1px solid var(--ink);
    font-size: 12px;
    letter-spacing: 0.08em;
    transition: background 160ms ease, border-color 160ms ease;
  }

  .gb-jump-form:hover,
  .gb-jump-form:focus-visible {
    background: var(--blue);
    border-color: var(--blue);
  }
}

@media (max-width: 640px) {
  .gb-form {
    grid-template-columns: 1fr;
  }

  .gb-submit-row .button {
    width: 100%;
  }

  .gb-flow-steps {
    grid-template-columns: 1fr;
  }
}