/* ============================================================
   留言板页面 —— 信箱文艺风
   主色复用碎碎念的 --ss-theme 体系，保持视觉统一
   ============================================================ */

:root {
  --gb-theme: #E68282;
  --gb-theme-op: rgba(230, 130, 130, 0.14);
  --gb-font: #4c4948;
  --gb-font-sub: #8c8c8c;
  --gb-card-bg: #fff;
  --gb-shadow: 0 8px 24px -10px rgba(0, 0, 0, 0.15);
  --gb-radius: 18px;
}

[data-theme="dark"] {
  --gb-theme: #f2b94b;
  --gb-theme-op: rgba(242, 185, 75, 0.14);
  --gb-font: #f2f2f8;
  --gb-font-sub: #9a9aa8;
  --gb-card-bg: #1e1e24;
  --gb-shadow: 0 8px 24px -10px rgba(0, 0, 0, 0.5);
}

/* 页面容器去默认边框 */
#page:has(#guestbook-page) {
  border: 0;
  box-shadow: none !important;
  padding: 0 !important;
  background: transparent !important;
}
#page:has(#guestbook-page) .page-title {
  display: none;
}

#guestbook-page {
  max-width: 820px;
  margin: 0 auto;
}

/* —— 顶部信箱 banner —— */
.gb-banner {
  position: relative;
  width: 100%;
  height: 280px;
  border-radius: var(--gb-radius);
  overflow: hidden;
  margin-bottom: 2rem;
  background: linear-gradient(135deg, var(--gb-theme) 0%, #f5c6c6 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--gb-shadow);
}
[data-theme="dark"] .gb-banner {
  background: linear-gradient(135deg, #2a2a30 0%, var(--gb-theme-op) 100%);
}
.gb-banner-mask {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(255,255,255,0.25), transparent 40%),
    radial-gradient(circle at 80% 80%, rgba(0,0,0,0.15), transparent 50%);
}
.gb-banner-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  color: #fff;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}
.gb-icon {
  font-size: 3rem;
  margin-bottom: 0.8rem;
  display: block;
  animation: gb-float 3s ease-in-out infinite;
}
@keyframes gb-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}
.gb-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin: 0 0 0.4rem;
  letter-spacing: 2px;
}
.gb-subtitle {
  font-size: 0.95rem;
  margin: 0;
  opacity: 0.92;
  letter-spacing: 1px;
}

/* —— 写信引导区 —— */
.gb-letter {
  position: relative;
  background: var(--gb-card-bg);
  border-radius: var(--gb-radius);
  padding: 2rem 2.4rem;
  margin-bottom: 2.5rem;
  box-shadow: var(--gb-shadow);
  font-family: "Georgia", "Songti SC", "STSong", "宋体", serif;
  line-height: 2;
  color: var(--gb-font);
  text-align: center;
}
.gb-letter::before {
  content: '"';
  position: absolute;
  top: 0.4rem;
  left: 1.2rem;
  font-size: 3.5rem;
  color: var(--gb-theme);
  opacity: 0.35;
  font-family: Georgia, serif;
  line-height: 1;
}
.gb-letter p {
  margin: 0 0 1rem;
}
.gb-letter p:last-child {
  margin-bottom: 0;
}
.gb-sign {
  color: var(--gb-font-sub);
  font-size: 0.9rem;
  font-style: italic;
}

/* —— 评论区容器 —— */
#giscus-container {
  background: var(--gb-card-bg);
  border-radius: var(--gb-radius);
  padding: 1.4rem;
  box-shadow: var(--gb-shadow);
  min-height: 200px;
}

/* 响应式 */
@media screen and (max-width: 768px) {
  .gb-banner { height: 220px; }
  .gb-title { font-size: 1.5rem; }
  .gb-letter { padding: 1.6rem 1.4rem; }
}