/* ========================================================
   大程地理实验室 ✦ 静态手账风格核心样式库 (style.css)
   ======================================================== */

:root {
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --shadow-card: 0 8px 24px rgba(236, 64, 122, 0.05), 0 2px 6px rgba(0, 0, 0, 0.03);
  --shadow-hover: 0 14px 32px rgba(236, 64, 122, 0.1), 0 4px 10px rgba(0, 0, 0, 0.04);
  --text-main: #1F2937;       /* 深入清晰深灰，对比度极佳 */
  --text-muted: #4B5563;      /* 提升对比度至 > 7:1，告别模糊浅灰 */
  --text-light: #64748B;      /* 次级辅助文字，符合 WCAG AA */
  --primary-pink: #F06292;
  --primary-deep: #D81B60;
  --accent-purple: #D1B3E8;
  --accent-deep-purple: #9C27B0;
  --bg-warm: #FFF9FA;
  --bg-card: #FFFFFF;
  --tape-color: rgba(248, 187, 208, 0.75);
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  background-color: var(--bg-warm);
  /* 调淡底纹对比度，避免干扰正文阅读 */
  background-image: radial-gradient(circle, rgba(243, 210, 220, 0.42) 1.2px, transparent 1.2px);
  background-size: 26px 26px;
  color: var(--text-main);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* 键盘可访问性焦点指示器 */
:focus-visible {
  outline: 2.5px solid #EC407A !important;
  outline-offset: 3px !important;
}

/* 氛围漂浮点缀与蝴蝶（降低对正文干扰） */
.bg-ambient-particles {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
  opacity: 0.75;
}

.sparkle {
  position: absolute;
  animation: floatSparkle 6s ease-in-out infinite alternate;
}

.sparkle-1 {
  top: 10%;
  left: 6%;
  animation-duration: 5s;
}

.sparkle-2 {
  top: 24%;
  right: 8%;
  animation-duration: 7s;
  animation-delay: 1s;
}

.sparkle-3 {
  bottom: 22%;
  left: 12%;
  animation-duration: 6.5s;
  animation-delay: 2s;
}

.butterfly-dec {
  position: absolute;
  top: 16%;
  right: 14%;
  animation: floatButterfly 8s ease-in-out infinite;
  opacity: 0.65;
}

@keyframes floatSparkle {
  0% { transform: translateY(0) scale(0.9); opacity: 0.4; }
  50% { transform: translateY(-10px) scale(1.05); opacity: 0.8; }
  100% { transform: translateY(-3px) scale(0.95); opacity: 0.5; }
}

@keyframes floatButterfly {
  0% { transform: translate(0, 0) rotate(0deg); }
  25% { transform: translate(-8px, -12px) rotate(-5deg); }
  50% { transform: translate(5px, -22px) rotate(3deg); }
  75% { transform: translate(10px, -10px) rotate(6deg); }
  100% { transform: translate(0, 0) rotate(0deg); }
}

/* 顶部品牌栏 */
.top-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 249, 250, 0.94);
  backdrop-filter: blur(14px);
  border-bottom: 1px dashed rgba(240, 98, 146, 0.25);
  box-shadow: 0 2px 10px rgba(240, 98, 146, 0.04);
}

.header-container {
  max-width: 880px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.brand-wrapper {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  gap: 10px;
}

.brand-signature {
  font-family: 'Caveat', 'Segoe Print', 'Bradley Hand', 'Comic Sans MS', cursive, sans-serif;
  font-size: 26px;
  font-weight: 700;
  color: var(--primary-deep);
  letter-spacing: 0.5px;
}

.brand-divider {
  width: 1px;
  height: 18px;
  background: #F8BBD0;
}

.brand-lab-name {
  font-size: 16px;
  font-weight: 700;
  color: #1F2937;
  letter-spacing: 0.5px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-badge {
  font-size: 12px;
  font-weight: 600;
  background: linear-gradient(135deg, #FCE4EC 0%, #F3E5F5 100%);
  color: #C2185B;
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid rgba(240, 98, 146, 0.25);
}

/* 顶部主站预告项（非交互元素） */
.header-main-site-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  color: #4B5563;
  background: #FFFFFF;
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px dashed rgba(209, 179, 232, 0.8);
  cursor: default;
  user-select: none;
}

.header-main-site-badge .tag-upcoming {
  font-size: 11px;
  font-weight: 700;
  background: #FFF0F5;
  color: #D81B60;
  padding: 1px 7px;
  border-radius: 10px;
}

/* 顶部主站链接（当开关启用时变为可用链接） */
.header-main-site-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  font-weight: 700;
  color: #C2185B;
  background: linear-gradient(135deg, #FCE4EC 0%, #F8BBD0 100%);
  padding: 5px 12px;
  border-radius: 20px;
  text-decoration: none;
  border: 1px solid rgba(240, 98, 146, 0.3);
  transition: all 0.2s ease;
}

.header-main-site-link:hover {
  background: linear-gradient(135deg, #EC407A 0%, #AB47BC 100%);
  color: #FFFFFF;
  box-shadow: 0 3px 10px rgba(236, 64, 122, 0.25);
}

/* 页面主容器（为底部悬浮栏与 safe-area 留足空隙） */
.page-container {
  max-width: 880px;
  margin: 0 auto;
  padding: 28px 20px calc(130px + env(safe-area-inset-bottom, 0px));
  position: relative;
  z-index: 1;
}

/* 手账标题区 */
.journal-hero {
  text-align: center;
  margin-bottom: 26px;
}

.journal-tagline {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: 'Caveat', 'Segoe Print', 'Bradley Hand', 'Comic Sans MS', cursive, sans-serif;
  font-size: 19px;
  font-weight: 700;
  color: #D81B60;
  background: #FFF0F5;
  padding: 4px 16px;
  border-radius: 20px;
  margin-bottom: 12px;
  border: 1px dashed #F8BBD0;
}

.journal-title {
  font-size: 32px;
  font-weight: 800;
  color: #1F2937;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}

.journal-subtitle {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 620px;
  margin: 0 auto;
}

/* 首页手账相框容器：按原始比例缩小、居中完整展示，无裁剪，父容器高度随图片自动撑开 */
.cover-frame {
  position: relative;
  background: #ffffff;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(240, 98, 146, 0.24);
  box-shadow: var(--shadow-card);
  padding: 14px 14px 12px;
  margin: 0 auto 28px;
  max-width: 660px; /* 桌面端适度限制宽度居中，保证比例舒展协调 */
  width: 100%;
}

.cover-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  margin-inline: auto;
  border-radius: 18px;
  object-fit: contain; /* 允许留白，确保原图完整显示，绝不拉伸、绝不裁剪 */
}

.cover-frame .washi-tape {
  top: -12px;
  right: 28px;
  transform: rotate(5deg);
}

.cover-caption {
  text-align: center;
  font-size: 13.5px;
  color: var(--text-muted);
  padding: 12px 8px 4px;
  font-weight: 500;
}

/* 和纸胶带元素 */
.washi-tape {
  position: absolute;
  top: -12px;
  width: 86px;
  height: 24px;
  background: var(--tape-color);
  backdrop-filter: blur(3px);
  border-left: 2px dashed rgba(255, 255, 255, 0.9);
  border-right: 2px dashed rgba(255, 255, 255, 0.9);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
  z-index: 5;
  pointer-events: none;
}

/* 入口卡片网格 */
.portal-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
  margin-bottom: 30px;
}

.journal-card {
  position: relative;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(240, 98, 146, 0.22);
  box-shadow: var(--shadow-card);
  padding: 24px 22px 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 18px;
  transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.journal-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(240, 98, 146, 0.45);
}

.journal-card .washi-tape {
  right: 28px;
  transform: rotate(4deg);
}

.card-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary-deep);
  background: #FFF0F5;
  padding: 4px 12px;
  border-radius: 12px;
  margin-bottom: 14px;
}

.card-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  background: linear-gradient(135deg, #F06292 0%, #F8BBD0 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  margin-bottom: 14px;
  box-shadow: 0 5px 14px rgba(240, 98, 146, 0.24);
}

.card-title {
  font-size: 19px;
  font-weight: 700;
  color: #1F2937;
  margin-bottom: 8px;
}

.card-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

.card-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  background: linear-gradient(135deg, #FCE4EC 0%, #F8BBD0 100%);
  color: #C2185B;
  border-radius: 14px;
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
  transition: all 0.2s ease;
  border: 1px solid rgba(240, 98, 146, 0.2);
}

.card-btn:hover {
  background: linear-gradient(135deg, #EC407A 0%, #F06292 100%);
  color: #FFFFFF;
  box-shadow: 0 5px 14px rgba(236, 64, 122, 0.25);
  transform: scale(1.01);
}

/* 首页主站预告卡片专属样式（非交互、无无效按钮） */
.preview-card {
  background: #FFFFFF;
  border: 1.5px dashed rgba(209, 179, 232, 0.7);
  box-shadow: 0 6px 20px rgba(209, 179, 232, 0.1);
  cursor: default;
}

.preview-card:hover {
  transform: none; /* 预告卡片不悬浮跳动 */
  box-shadow: 0 6px 20px rgba(209, 179, 232, 0.1);
  border-color: rgba(209, 179, 232, 0.9);
}

.preview-badge {
  color: #7B1FA2;
  background: #F3E5F5;
}

.preview-icon {
  background: linear-gradient(135deg, #D1B3E8 0%, #F8BBD0 100%);
  box-shadow: 0 5px 14px rgba(209, 179, 232, 0.35);
  color: #4A148C;
}

.card-status-pending {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 11px 16px;
  background: #F8FAFC;
  border: 1px dashed #CBD5E1;
  border-radius: 14px;
  color: #64748B;
  font-size: 13.5px;
  font-weight: 600;
  user-select: none;
}

/* 学习手账区 */
.memo-section {
  background: #FFFDF9;
  border: 1.5px dashed rgba(220, 180, 150, 0.7);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  position: relative;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.02);
}

.memo-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  font-weight: 700;
  color: #8D6E63;
  margin-bottom: 14px;
}

.memo-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.memo-list li {
  position: relative;
  padding-left: 24px;
  font-size: 14.5px;
  color: #374151;
  line-height: 1.65;
  word-break: break-word; /* 保证手机端文字自然折行，不截断 */
}

.memo-list li::before {
  content: "✦";
  position: absolute;
  left: 4px;
  top: 0;
  color: #EC407A;
  font-size: 13px;
}

/* 新闻卡片来源区域样式 */
.news-sources-wrap {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.source-item {
  display: inline-flex;
  align-items: center;
  font-size: 12.5px;
  color: #4B5563;
  background: #FDF2F8;
  padding: 3px 10px;
  border-radius: 8px;
  border: 1px solid rgba(244, 143, 177, 0.35);
  line-height: 1.4;
}

.source-name {
  font-weight: 600;
  color: #374151;
}

.source-divider {
  margin: 0 4px;
  color: #F48FB1;
  font-weight: bold;
}

.source-link {
  color: #D81B60;
  font-weight: 700;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 2px;
  border-bottom: 1px dashed #D81B60;
  transition: all 0.2s ease;
}

.source-link:hover {
  color: #C2185B;
  border-bottom-style: solid;
  transform: translateY(-1px);
}

.source-pending {
  color: #64748B;
  font-size: 12px;
  font-style: normal;
  user-select: none;
}

/* 新闻卡片日期多层级显示 */
.news-date-group {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
}

.news-card-updated {
  font-size: 11.5px;
  color: #94A3B8;
  font-weight: 500;
  user-select: none;
}

.news-card-date.date-topic,
.news-card-date.date-pending {
  font-size: 12.5px;
  font-family: inherit;
  color: #8D6E63;
  background: #FFF8E1;
  padding: 2px 8px;
  border-radius: 8px;
  border: 1px dashed #FFE082;
}

/* 底部主导航条（适配手机 safe-area） */
.bottom-nav-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  justify-content: center;
  padding: 10px 16px calc(14px + env(safe-area-inset-bottom, 0px));
  pointer-events: none;
}

.bottom-nav-inner {
  pointer-events: auto;
  display: flex;
  gap: 8px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(18px);
  padding: 6px 10px;
  border-radius: 40px;
  border: 1px solid rgba(240, 98, 146, 0.28);
  box-shadow: 0 10px 28px rgba(236, 64, 122, 0.12), 0 2px 8px rgba(0, 0, 0, 0.04);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 30px;
  text-decoration: none;
  color: #4B5563;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  cursor: pointer;
  pointer-events: auto;
  user-select: none;
}

.nav-link svg {
  width: 18px;
  height: 18px;
  transition: transform 0.2s ease;
}

.nav-link:hover {
  color: var(--primary-deep);
  background: #FFF0F5;
}

.nav-link:hover svg {
  transform: scale(1.12);
}

.nav-link.active {
  color: #FFFFFF;
  background: linear-gradient(135deg, #EC407A 0%, #AB47BC 100%);
  box-shadow: 0 5px 14px rgba(236, 64, 122, 0.35);
}

/* 通用手账卡片容器 */
.content-box {
  background: #ffffff;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(240, 98, 146, 0.22);
  box-shadow: var(--shadow-card);
  padding: 24px;
  margin-bottom: 24px;
  position: relative;
}

/* ========================================================
   思维导图原图导图查看器 & 双模式切换组件
   ======================================================== */

.view-mode-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.view-mode-tabs {
  display: inline-flex;
  background: #FFFFFF;
  padding: 4px;
  border-radius: 30px;
  border: 1.5px solid rgba(240, 98, 146, 0.3);
  box-shadow: 0 4px 14px rgba(236, 64, 122, 0.08);
  gap: 6px;
}

.mode-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 20px;
  border: none;
  background: transparent;
  color: #4B5563;
  font-size: 13.5px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.22s cubic-bezier(0.34, 1.56, 0.64, 1);
  user-select: none;
}

.mode-tab-btn:hover {
  color: var(--primary-deep);
  background: #FFF0F5;
}

.mode-tab-btn.active {
  background: linear-gradient(135deg, #EC407A 0%, #AB47BC 100%);
  color: #FFFFFF;
  box-shadow: 0 4px 12px rgba(236, 64, 122, 0.3);
}

.mode-tab-btn .tab-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 1px 7px;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.06);
  color: inherit;
}

.mode-tab-btn.active .tab-badge {
  background: rgba(255, 255, 255, 0.25);
  color: #FFFFFF;
}

/* 多子图切换胶囊 (如大气受热过程的完整导图/逆温专题图) */
.sub-image-tabs {
  display: inline-flex;
  align-items: center;
  background: #FFF0F5;
  padding: 3px;
  border-radius: 18px;
  border: 1px solid rgba(240, 98, 146, 0.28);
  gap: 4px;
}

.sub-image-btn {
  border: none;
  background: transparent;
  color: #C2185B;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 11px;
  border-radius: 14px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  user-select: none;
}

.sub-image-btn:hover {
  background: rgba(236, 64, 122, 0.12);
}

.sub-image-btn.active {
  background: linear-gradient(135deg, #EC407A 0%, #AB47BC 100%);
  color: #FFFFFF;
  box-shadow: 0 2px 8px rgba(236, 64, 122, 0.28);
}

/* 原图导图查看器容器 */
.svg-viewer-container {
  position: relative;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.svg-viewport {
  position: relative;
  width: 100%;
  height: 560px;
  background-color: #FAFAFC;
  background-image: radial-gradient(circle, rgba(240, 98, 146, 0.2) 1.2px, transparent 1.2px);
  background-size: 22px 22px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(240, 98, 146, 0.25);
  overflow: hidden;
  cursor: grab;
  user-select: none;
  touch-action: none;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.03);
}

.svg-viewport.is-grabbing {
  cursor: grabbing !important;
}

.svg-canvas {
  position: absolute;
  top: 0;
  left: 0;
  transform-origin: 0 0;
  will-change: transform;
  pointer-events: none;
}

.svg-canvas.smooth-transition {
  transition: transform 0.24s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.svg-canvas img {
  display: block;
  max-width: none;
  max-height: none;
  pointer-events: none;
  user-select: none;
  -webkit-user-drag: none;
  object-fit: contain;
}

.zoom-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 52px;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 700;
  color: #8D6E63;
  background: #FFF8E1;
  border: 1px solid #FFE082;
  border-radius: 14px;
  user-select: none;
}

.svg-viewer-tip {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: #64748B;
  background: #FFF9FA;
  padding: 8px 14px;
  border-radius: 12px;
  border: 1px dashed rgba(240, 98, 146, 0.25);
  line-height: 1.5;
}

.svg-viewer-tip strong {
  color: var(--primary-deep);
}

.svg-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  text-align: center;
  gap: 14px;
  background: #FFFDF9;
  border-radius: var(--radius-md);
  border: 1.5px dashed #F8BBD0;
}

.svg-empty-icon {
  font-size: 40px;
}

.svg-empty-title {
  font-size: 16.5px;
  font-weight: 700;
  color: #1F2937;
}

.svg-empty-desc {
  font-size: 13.5px;
  color: #64748B;
  max-width: 440px;
  line-height: 1.6;
}

/* 全屏状态与全屏控制条统一优化 */
.graphics-fullscreen-wrapper:fullscreen,
.graphics-fullscreen-wrapper:-webkit-full-screen,
.svg-viewer-container:fullscreen,
.svg-viewer-container:-webkit-full-screen,
.html-map-container:fullscreen,
.html-map-container:-webkit-full-screen {
  background: #FFF9FA;
  padding: 16px;
  width: 100vw;
  height: 100vh;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.fullscreen-controls-bar {
  display: none;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
  padding: 8px 16px;
  border-radius: 20px;
  border: 1px solid rgba(240, 98, 146, 0.3);
  box-shadow: 0 4px 16px rgba(236, 64, 122, 0.1);
  margin-bottom: 8px;
  z-index: 1000;
}

.graphics-fullscreen-wrapper:fullscreen .fullscreen-controls-bar,
.graphics-fullscreen-wrapper:-webkit-full-screen .fullscreen-controls-bar,
.svg-viewer-container:fullscreen .fullscreen-controls-bar,
.svg-viewer-container:-webkit-full-screen .fullscreen-controls-bar,
.html-map-container:fullscreen .fullscreen-controls-bar,
.html-map-container:-webkit-full-screen .fullscreen-controls-bar {
  display: flex;
}

.graphics-fullscreen-wrapper:fullscreen .svg-viewport,
.graphics-fullscreen-wrapper:-webkit-full-screen .svg-viewport,
.graphics-fullscreen-wrapper:fullscreen .html-map-frame-wrapper,
.graphics-fullscreen-wrapper:-webkit-full-screen .html-map-frame-wrapper,
.svg-viewer-container:fullscreen .svg-viewport,
.svg-viewer-container:-webkit-full-screen .svg-viewport,
.html-map-container:fullscreen .html-map-frame-wrapper,
.html-map-container:-webkit-full-screen .html-map-frame-wrapper {
  flex: 1;
  height: calc(100vh - 100px);
  border-radius: 16px;
  border: 2px solid #F8BBD0;
}

/* HTML 导图 iframe 嵌入查看器 (与 SVG 查看器高度、边框、暗纹完全一致) */
.html-map-container {
  position: relative;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.html-map-frame-wrapper {
  position: relative;
  width: 100%;
  height: 560px;
  background-color: #FAFAFC;
  background-image: radial-gradient(circle, rgba(240, 98, 146, 0.2) 1.2px, transparent 1.2px);
  background-size: 22px 22px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(240, 98, 146, 0.25);
  overflow: hidden;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.03);
}

.html-map-iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
  background: transparent;
}

/* 响应式适配 */
@media (max-width: 768px) {
  .page-container {
    padding: 20px 16px calc(120px + env(safe-area-inset-bottom, 0px));
  }
  .portal-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .journal-title {
    font-size: 28px;
  }
  .cover-frame {
    max-width: 100%;
    padding: 10px 10px 8px;
  }
  .svg-viewport {
    height: 420px;
  }
  .html-map-frame-wrapper {
    height: 420px;
  }
}

@media (max-width: 480px) {
  .header-container {
    padding: 10px 14px;
  }
  .brand-lab-name {
    font-size: 14px;
  }
  .brand-signature {
    font-size: 22px;
  }
  .journal-title {
    font-size: 24px;
  }
  .journal-subtitle {
    font-size: 14px;
  }
  .bottom-nav-inner {
    padding: 4px 6px;
    gap: 4px;
  }
  .nav-link {
    padding: 8px 12px;
    font-size: 13px;
    gap: 4px;
  }
  .nav-link svg {
    width: 16px;
    height: 16px;
  }
  .source-item {
    font-size: 12px;
    padding: 2px 8px;
  }
  .mode-tab-btn {
    padding: 6px 12px;
    font-size: 12.5px;
  }
  .svg-viewport {
    height: 350px;
  }
  .html-map-frame-wrapper {
    height: 350px;
  }
}

/* CSS 全屏后备模式 (针对 iOS Safari 等不支持原生 Fullscreen API 的移动端) */
.svg-viewer-container.is-css-fullscreen {
  position: fixed !important;
  inset: 0 !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  bottom: 0 !important;
  width: 100vw !important;
  height: 100vh !important;
  z-index: 99999 !important;
  background: #FFF9FA !important;
  padding: 12px !important;
  box-sizing: border-box !important;
  display: flex !important;
  flex-direction: column !important;
  justify-content: space-between !important;
  margin: 0 !important;
}

.svg-viewer-container.is-css-fullscreen .fullscreen-controls-bar {
  display: flex !important;
}

.svg-viewer-container.is-css-fullscreen .svg-viewport {
  flex: 1 !important;
  height: calc(100vh - 90px) !important;
  border-radius: 16px !important;
  border: 2px solid #F8BBD0 !important;
}

/* 手机横屏体验优化 (高度受限场景) */
@media (max-height: 500px) and (orientation: landscape) {
  .page-container {
    padding: 14px 16px calc(90px + env(safe-area-inset-bottom, 0px));
  }
  .journal-hero {
    margin-bottom: 14px;
  }
  .svg-viewport {
    height: 280px;
  }
  .mindmap-board {
    padding: 16px 14px;
    margin-bottom: 20px;
  }
}