@font-face {
  font-family: 'Noto Sans SC';
  font-style: normal;font-weight: 300;font-display: swap;
  src: url(https://fonts.gstatic.com/s/notosanssc/v40/k3kCo84MPvpLmixcA63oeAL7Iqp5IZJF9bmaG4HFnYw.ttf) format('truetype');
}
@font-face {
  font-family: 'Noto Sans SC';
  font-style: normal;font-weight: 400;font-display: swap;
  src: url(https://fonts.gstatic.com/s/notosanssc/v40/k3kCo84MPvpLmixcA63oeAL7Iqp5IZJF9bmaG9_FnYw.ttf) format('truetype');
}
@font-face {
  font-family: 'Noto Sans SC';
  font-style: normal;font-weight: 500;font-display: swap;
  src: url(https://fonts.gstatic.com/s/notosanssc/v40/k3kCo84MPvpLmixcA63oeAL7Iqp5IZJF9bmaG-3FnYw.ttf) format('truetype');
}
@font-face {
  font-family: 'Noto Sans SC';
  font-style: normal;font-weight: 600;font-display: swap;
  src: url(https://fonts.gstatic.com/s/notosanssc/v40/k3kCo84MPvpLmixcA63oeAL7Iqp5IZJF9bmaGwHCnYw.ttf) format('truetype');
}
@font-face {
  font-family: 'Noto Sans SC';
  font-style: normal;font-weight: 700;font-display: swap;
  src: url(https://fonts.gstatic.com/s/notosanssc/v40/k3kCo84MPvpLmixcA63oeAL7Iqp5IZJF9bmaGzjCnYw.ttf) format('truetype');
}
@font-face {
  font-family: 'Orbitron';
  font-style: normal;font-weight: 400;font-display: swap;
  src: url(https://fonts.gstatic.com/s/orbitron/v35/yMJMMIlzdpvBhQQL_SC3X9yhF25-T1nyGy6xpg.ttf) format('truetype');
}
@font-face {
  font-family: 'Orbitron';
  font-style: normal;font-weight: 500;font-display: swap;
  src: url(https://fonts.gstatic.com/s/orbitron/v35/yMJMMIlzdpvBhQQL_SC3X9yhF25-T1nyKS6xpg.ttf) format('truetype');
}
@font-face {
  font-family: 'Orbitron';
  font-style: normal;font-weight: 600;font-display: swap;
  src: url(https://fonts.gstatic.com/s/orbitron/v35/yMJMMIlzdpvBhQQL_SC3X9yhF25-T1nyxSmxpg.ttf) format('truetype');
}
@font-face {
  font-family: 'Orbitron';
  font-style: normal;font-weight: 700;font-display: swap;
  src: url(https://fonts.gstatic.com/s/orbitron/v35/yMJMMIlzdpvBhQQL_SC3X9yhF25-T1ny_Cmxpg.ttf) format('truetype');
}

/* ===== RESET ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{
  font-family:'Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  background:#FFFFFF;color:#0F172A;overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
::selection{background:rgba(14,165,233,0.2);color:#0F172A}

/* ===== HERO + FIRST SCREEN (100vh) ===== */
.hero-section{min-height:calc(100vh - 38px)}
.hero-section.expanded{min-height:auto}
.hero{width:100%;max-height:852px;aspect-ratio:3/1;overflow:hidden}
.hero img{width:100%;height:100%;object-fit:cover;display:block}
.entry-section{}

/* ===== FANGCHAN HEADER ===== */
.fc-header{background:#fff;border-bottom:1px solid #E2E8F0}
.fc-header-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:38px;max-width:1200px;margin:0 auto;padding:0 2vw;
}
.fc-logo-link{display:flex;align-items:center;flex-shrink:0}
.fc-logo-link img{height:22px;width:auto}
.fc-nav-links{display:flex;align-items:center;gap:4px}
.fc-nav-links a{
  padding:4px 12px;font-size:12px;color:#475569;
  font-family:'Noto Sans SC',sans-serif;text-decoration:none;
  border-radius:6px;transition:all 0.2s;white-space:nowrap;
}
.fc-nav-links a:hover{color:#0EA5E9;background:#F0F9FF}
@media(max-width:640px){.fc-nav-links a{padding:4px 8px}}
@media(min-width:1920px){.fc-header-inner{height:48px}}

/* ===== ENTRY CARDS (2 columns) ===== */
.entry-section{padding:2.5rem 1.5rem;background:#fff}
@media(min-width:1024px){.entry-section{padding:3rem 2rem}}
.entry-grid{
  max-width:1000px;margin:0 auto;display:grid;gap:1.2rem;
  grid-template-columns:1fr;
}
@media(min-width:640px){.entry-grid{grid-template-columns:repeat(2,1fr);gap:1.5rem}}

.entry-card{
  position:relative;overflow:hidden;text-align:left;cursor:pointer;
  border-radius:16px;border:1px solid #E2E8F0;background:#fff;padding:1.8rem;
  transition:all 0.4s cubic-bezier(0.4,0,0.2,1);
  box-shadow:0 1px 3px rgba(0,0,0,0.04);
}
.entry-card:hover{transform:translateY(-4px)}
.entry-card.market.expanded{border-color:#0EA5E9;background:#F0F9FF;box-shadow:0 4px 20px rgba(14,165,233,0.1)}
.entry-card.ranking.expanded{border-color:#CC2C33;background:#FEF2F2;box-shadow:0 4px 20px rgba(204,44,51,0.1)}
.entry-card:hover:not(.expanded){border-color:#0EA5E9;box-shadow:0 4px 16px rgba(14,165,233,0.1)}
.entry-card.ranking:hover:not(.expanded){border-color:#CC2C33;box-shadow:0 4px 16px rgba(204,44,51,0.1)}
.entry-card .ec-accent{
  position:absolute;top:0;left:0;right:0;height:3px;
  opacity:0;transition:opacity 0.3s;
}
.entry-card.market .ec-accent{background:#0EA5E9}
.entry-card.ranking .ec-accent{background:#CC2C33}
.entry-card.expanded .ec-accent{opacity:1}
.entry-card .ec-num{font-size:3rem;font-weight:700;font-family:'Orbitron',sans-serif;line-height:1;margin-bottom:0.8rem}
.entry-card.market .ec-num{color:#0EA5E910}
.entry-card.ranking .ec-num{color:#CC2C3310}
.entry-card .ec-title{font-size:1.1rem;font-weight:700;color:#0F172A;font-family:'Noto Sans SC',sans-serif;margin-bottom:0.3rem}
.entry-card .ec-subtitle{font-size:0.85rem;color:#64748B;margin-bottom:1rem}
.entry-card .ec-action{display:flex;align-items:center;gap:4px;font-size:0.85rem;font-weight:500}
.entry-card.market .ec-action{color:#0EA5E9}
.entry-card.ranking .ec-action{color:#CC2C33}
.entry-card .ec-action svg{width:14px;height:14px;transition:transform 0.3s}
.entry-card.expanded .ec-action svg{transform:rotate(90deg)}
.entry-card.market.expanded .ec-action svg{transform:none}
@media(min-width:1024px){
  .entry-card{padding:1.8rem}
  .entry-card .ec-num{font-size:3rem}
  .entry-card .ec-title{font-size:1.25rem}
}

/* ===== DIVIDER ===== */
.section-divider{width:100%;height:1px;background:#E2E8F0}

/* ===== SUB CARDS SECTION ===== */
.sub-section{display:none;padding:2.5rem 1.5rem;background:#F8FAFC}
.sub-section.active{display:block}
@media(min-width:1024px){.sub-section{padding:3.5rem 2rem}}
.sub-inner{max-width:1200px;margin:0 auto}
.sub-title{text-align:center;margin-bottom:2rem}
.sub-title h2{font-size:1.5rem;font-weight:700;color:#0F172A;font-family:'Noto Sans SC',sans-serif}
.sub-title .st-divider{width:3rem;height:2px;margin:0.8rem auto 0}
.sub-title.market .st-divider{background:#0EA5E9}
.sub-title.ranking .st-divider{background:#CC2C33}
@media(min-width:1024px){.sub-title h2{font-size:1.8rem}}
.sub-cards{
  display:grid;gap:1.2rem;
  grid-template-columns:1fr;
}
@media(min-width:560px){.sub-cards{grid-template-columns:repeat(2,1fr)}}
@media(min-width:900px){.sub-cards{grid-template-columns:repeat(3,1fr);gap:1.5rem}}

.sub-card{
  position:relative;cursor:pointer;overflow:hidden;
  border-radius:16px;border:1px solid #E2E8F0;background:#fff;
  box-shadow:0 1px 3px rgba(0,0,0,0.04);
  transition:all 0.4s cubic-bezier(0.4,0,0.2,1);aspect-ratio:3/4;
}
.sub-card:hover{transform:translateY(-8px) scale(1.02)}
.sub-card .sc-accent{position:absolute;top:0;left:0;right:0;height:4px}
.sub-card .sc-num{
  position:absolute;top:1.5rem;left:1.5rem;
  font-size:clamp(2.5rem,5vw,3.8rem);font-weight:700;
  font-family:'Orbitron',sans-serif;line-height:1;
}
.sub-card .sc-body{position:absolute;bottom:0;left:0;right:0;padding:1.2rem}
@media(min-width:1024px){.sub-card .sc-body{padding:1.5rem}}
.sub-card .sc-badge{
  display:inline-block;font-size:0.75rem;padding:0.15rem 0.8rem;border-radius:9999px;
  margin-bottom:0.8rem;border:1px solid;
}
.sub-card .sc-title{
  font-size:clamp(1.1rem,2vw,1.4rem);font-weight:700;color:#0F172A;
  font-family:'Noto Sans SC',sans-serif;line-height:1.3;margin-bottom:0.4rem;min-height:3.7rem;
}
.sub-card .sc-subtitle{font-size:clamp(0.7rem,1vw,0.85rem);color:#64748B;margin-bottom:1rem}
.sub-card .sc-action{display:flex;align-items:center;gap:4px;font-size:0.8rem;font-weight:500}
.sub-card .sc-action svg{width:14px;height:14px}

/* ===== DEEP CONTENT SECTION ===== */
.deep-section{display:none;padding:2.5rem 1.5rem;background:#fff}
.deep-section.active{display:block}
@media(min-width:1024px){.deep-section{padding:3.5rem 2rem}}
.deep-inner{max-width:1400px;margin:0 auto}

/* Breadcrumb */
.deep-bc{display:flex;align-items:center;gap:8px;margin-bottom:1.5rem;flex-wrap:wrap}
.deep-bc span{font-size:0.85rem;color:#64748B}
.deep-bc .bc-current{font-weight:500;color:#0F172A}
.deep-bc .bc-highlight{color:#0EA5E9}
.deep-bc .bc-sep{color:#CBD5E1}

/* National Report */
.report-header{text-align:center;margin-bottom:1.5rem}
.report-header .rh-eyebrow{font-size:0.85rem;letter-spacing:0.2em;color:#0EA5E9;margin-bottom:0.5rem}
.report-header h3{font-size:1.2rem;font-weight:700;color:#0F172A;font-family:'Noto Sans SC',sans-serif;margin-bottom:0.3rem}
.report-header .rh-sub{font-size:0.85rem;color:#64748B}
.rh-divider{width:5rem;height:2px;margin:0 auto 1.5rem;background:linear-gradient(to right,transparent,#0EA5E9,transparent)}
@media(min-width:1024px){.report-header h3{font-size:1.5rem}}

/* Chapter Grid */
.chapter-grid{
  display:grid;gap:1rem;
  grid-template-columns:repeat(2,1fr);
}
@media(min-width:640px){.chapter-grid{grid-template-columns:repeat(3,1fr)}}
@media(min-width:1024px){.chapter-grid{grid-template-columns:repeat(5,1fr);gap:1rem}}

.chapter-card {
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-radius: 16px;
  border: 1px solid #E2E8F0;
  background: #FFFFFF;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
  aspect-ratio: 4 / 5;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.chapter-card:hover {
  border-color: var(--chapter-color);
  box-shadow: 0 12px 32px var(--chapter-color-shadow);
  transform: translateY(-8px) scale(1.02);
}
.chapter-card__header {
  position: relative;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 16px;
  background: linear-gradient(135deg, var(--chapter-color1) 0%, var(--chapter-color2) 100%);
  overflow: hidden;
}
.chapter-card__header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--chapter-color);
  box-shadow: 0 2px 12px var(--chapter-color-shadow);
}
.chapter-card__number {
  position: absolute;
  top: 14px;
  left: 16px;
  font-size: 14px;
  font-weight: 700;
  font-family: 'Orbitron', sans-serif;
  line-height: 1;
  color: var(--chapter-color);
}
.chapter-card__tag {
  position: absolute;
  top: 12px;
  right: 16px;
  font-size: 11px;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: 9999px;
  background: var(--chapter-color-tag-bg);
  color: var(--chapter-color);
  border: 1px solid var(--chapter-color-tag-border);
  z-index: 1;
}
.chapter-card__title {
  font-size: 46px;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: 0.02em;
  margin-bottom: 0;
  color: #0F172A;
  font-family: 'Noto Sans SC', sans-serif;
  text-align: center;
  position: relative;
  z-index: 1;
}
.chapter-card__body {
  padding: 14px 20px 16px;
}
.chapter-card__subtitle {
  font-size: 12px;
  line-height: 1.5;
  margin-bottom: 10px;
  color: #64748B;
}
.chapter-card__link {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  font-weight: 500;
  color: var(--chapter-color);
}
/* 五个篇章颜色 - 增强渐变色可见度 */
.chapter-card--cyan    { --chapter-color: #00C9A7; --chapter-color-shadow: rgba(0,201,167,0.12); --chapter-color1: rgba(0,201,167,0.20); --chapter-color2: rgba(0,201,167,0.06); --chapter-color-number: rgba(0,201,167,0.15); --chapter-color-tag-bg: rgba(0,201,167,0.10); --chapter-color-tag-border: rgba(0,201,167,0.20); }
.chapter-card--blue    { --chapter-color: #0EA5E9; --chapter-color-shadow: rgba(14,165,233,0.12); --chapter-color1: rgba(14,165,233,0.20); --chapter-color2: rgba(14,165,233,0.06); --chapter-color-number: rgba(14,165,233,0.15); --chapter-color-tag-bg: rgba(14,165,233,0.10); --chapter-color-tag-border: rgba(14,165,233,0.20); }
.chapter-card--red     { --chapter-color: #CC2C33; --chapter-color-shadow: rgba(204,44,51,0.12); --chapter-color1: rgba(204,44,51,0.20); --chapter-color2: rgba(204,44,51,0.06); --chapter-color-number: rgba(204,44,51,0.15); --chapter-color-tag-bg: rgba(204,44,51,0.10); --chapter-color-tag-border: rgba(204,44,51,0.20); }
.chapter-card--gold    { --chapter-color: #F59E0B; --chapter-color-shadow: rgba(245,158,11,0.12); --chapter-color1: rgba(245,158,11,0.20); --chapter-color2: rgba(245,158,11,0.06); --chapter-color-number: rgba(245,158,11,0.15); --chapter-color-tag-bg: rgba(245,158,11,0.10); --chapter-color-tag-border: rgba(245,158,11,0.20); }
.chapter-card--purple  { --chapter-color: #8B5CF6; --chapter-color-shadow: rgba(139,92,246,0.12); --chapter-color1: rgba(139,92,246,0.20); --chapter-color2: rgba(139,92,246,0.06); --chapter-color-number: rgba(139,92,246,0.15); --chapter-color-tag-bg: rgba(139,92,246,0.10); --chapter-color-tag-border: rgba(139,92,246,0.20); }

/* City List */
.cl-header{text-align:center;margin-bottom:1.5rem}
.cl-title{font-size:1.3rem;font-weight:700;color:#0F172A;font-family:'Noto Sans SC',sans-serif;margin-bottom:0.3rem}
.cl-subtitle{font-size:0.85rem;color:#64748B}
@media(min-width:1024px){.cl-title{font-size:1.5rem}}
.city-list-hint{text-align:center;margin-bottom:1rem}
.city-list-hint p{font-size:0.85rem;color:#64748B}
.city-grid{
  display:grid;gap:0.8rem;
  grid-template-columns:1fr;
}
@media(min-width:480px){.city-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:768px){.city-grid{grid-template-columns:repeat(3,1fr)}}
@media(min-width:1024px){.city-grid{grid-template-columns:repeat(4,1fr);gap:1rem}}

.city-card{
  position:relative;cursor:pointer;overflow:hidden;border-radius:12px;
  border:1px solid #E2E8F0;background:#fff;
  box-shadow:0 1px 3px rgba(0,0,0,0.04);
  transition:all 0.35s cubic-bezier(0.4,0,0.2,1);aspect-ratio:16/10;
}
.city-card:hover{border-color:#0EA5E9;box-shadow:0 8px 24px rgba(14,165,233,0.12);transform:translateY(-4px) scale(1.02)}
.city-card img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:0.5;transition:opacity 0.35s}
.city-card:hover img{opacity:0.8}
.city-card .city-overlay{
  position:absolute;inset:0;
  background:linear-gradient(to top,rgba(15,23,42,0.85) 0%,rgba(15,23,42,0.2) 50%,transparent 100%);
}
.city-card .city-name{
  position:absolute;bottom:0;left:0;right:0;padding:0.8rem;
  font-size:clamp(0.9rem,1.5vw,1.15rem);font-weight:700;color:#F8FAFC;
  font-family:'Noto Sans SC',sans-serif;text-shadow:0 2px 4px rgba(0,0,0,0.3);
}
@media(min-width:1024px){.city-card .city-name{padding:1rem}}

/* Report Viewer */
.viewer-tabs{display:flex;gap:4px;flex-wrap:wrap}
.viewer-tab{
  padding:0.6rem 1.2rem;font-size:0.85rem;font-weight:500;cursor:pointer;border:none;
  border-radius:12px 12px 0 0;font-family:'Noto Sans SC',sans-serif;
  background:#F1F5F9;color:#475569;
  border:1px solid #E2E8F0;border-bottom:1px solid #E2E8F0;
  transition:all 0.3s;white-space:nowrap;
}
.viewer-tab.active{
  background:#0EA5E9;color:#fff;border:none;
  box-shadow:0 -2px 12px rgba(14,165,233,0.2);transform:translateY(-1px);
}
.viewer-tab-border{height:1px;background:#0EA5E9}
.viewer-panel{
  padding:1.2rem;background:#F8FAFC;border-radius:0 0 12px 12px;
  border:1px solid #E2E8F0;border-top:none;
}
@media(min-width:1024px){.viewer-panel{padding:1.5rem}}
.viewer-img-wrap{position:relative;overflow:hidden;border-radius:0.8rem;border:1px solid #E2E8F0;background:#fff;width:50%;margin:0 auto}
.viewer-img-wrap img{width:100%;height:auto;display:none}
.viewer-img-wrap img.loaded{display:block}
.viewer-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;height:clamp(300px,40vh,500px);gap:0.8rem}
.viewer-loading.hidden{display:none}
.spinner{width:2rem;height:2rem;border:2px solid #E2E8F0;border-top-color:#0EA5E9;border-radius:50%;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.viewer-caption{display:flex;align-items:center;justify-content:space-between;margin-top:0.8rem}
.viewer-caption .cap-text{font-size:0.85rem;color:#64748B}
.viewer-caption .cap-badge{font-size:0.75rem;padding:0.15rem 0.5rem;border-radius:4px;background:#E0F2FE;color:#0EA5E9}

/* ===== MODAL ===== */
.modal-overlay{
  position:fixed;inset:0;z-index:100;display:none;
  align-items:center;justify-content:center;padding:1rem;
  background:rgba(15,23,42,0.75);backdrop-filter:blur(8px);
  overflow-y:auto;-webkit-overflow-scrolling:touch;
}
.modal-overlay.active{display:flex}
.modal-box{
  position:relative;width:100%;max-width:min(1100px,95vw);max-height:90vh;
  border-radius:1rem;background:#fff;box-shadow:0 25px 60px rgba(0,0,0,0.15);
  animation:modalIn 0.35s ease;overflow-y:auto;
  -webkit-overflow-scrolling:touch;
}
@keyframes modalIn{from{opacity:0;transform:scale(0.92)}to{opacity:1;transform:scale(1)}}
.modal-header{
  position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;
  padding:1rem 1.5rem;background:rgba(255,255,255,0.95);backdrop-filter:blur(16px);
  border-bottom:1px solid #E2E8F0;
}
.modal-header .m-subtitle{font-size:0.75rem;margin-bottom:0.2rem}
.modal-header .m-title{font-size:1.1rem;font-weight:700;color:#0F172A;font-family:'Noto Sans SC',sans-serif}
.modal-close{display:flex;align-items:center;justify-content:center;width:2.2rem;height:2.2rem;border-radius:50%;background:#F1F5F9;color:#475569;border:none;cursor:pointer;transition:background 0.2s}
.modal-close:hover{background:#E2E8F0}
.modal-close svg{width:1rem;height:1rem}
.modal-body{padding:1.5rem}
.modal-body img{width:100%;border-radius:0.8rem;border:1px solid #E2E8F0}
.modal-body .m-desc{margin-top:1rem;font-size:0.85rem;color:#475569;line-height:1.6}

/* ===== TEXT MODAL ===== */
.modal-body-text{padding:2rem 2.5rem;text-align:center}
.modal-body-text .mt-chapter-num{font-size:5rem;font-weight:bold;font-family:Orbitron,sans-serif;line-height:1;margin-bottom:0.5rem}
.modal-body-text .mt-title{font-size:1.5rem;font-weight:700;margin:0 0 1.2rem 0;font-family:'Noto Sans SC',sans-serif}
.modal-body-text .mt-summary{font-size:0.95rem;color:#475569;line-height:1.8;max-width:640px;margin:0 auto 0.6rem auto;text-align:left;text-indent:2em}
.modal-body-text .mt-divider{width:2rem;height:3px;border-radius:2px;margin:0 auto 1.5rem auto;background:linear-gradient(to right,transparent,#CBD5E1,transparent)}
.modal-body-text .mt-action{display:inline-flex;align-items:center;gap:0.5rem;padding:0.7rem 1.8rem;border-radius:999px;font-size:0.9rem;font-weight:500;text-decoration:none;transition:all 0.3s ease;cursor:pointer}
.modal-body-text .mt-action:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,0,0,0.1)}

.modal-footer{padding:0 1.5rem 1.5rem;text-align:center}
.modal-footer .mt-action{display:inline-flex!important;margin:0 auto}
.modal-footer .mt-action:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,0,0,0.1)}

/* ===== ANIMATIONS ===== */
.animate-item{opacity:0;transform:translateY(20px)}
.animate-item.in{animation:itemIn 0.5s cubic-bezier(0.4,0,0.2,1) forwards}
@keyframes itemIn{to{opacity:1;transform:translateY(0)}}

/* ===== FOOTER ===== */
.fc-footer{text-align:center;padding:1rem 2vw;background:#F8FAFC;border-top:1px solid #E2E8F0}
.fc-footer p{font-size:0.75rem;color:#94A3B8;font-family:'Noto Sans SC',sans-serif;line-height:1.6}
@media(min-width:768px){.fc-footer p{font-size:0.8rem}}
@media(max-width:640px){
  .modal-overlay{align-items:flex-start}
  .modal-box{max-height:85vh;border-radius:0.8rem}
  .modal-header{padding:0.8rem 1rem}
  .modal-body{padding:1rem}
  .modal-body-text{padding:1.2rem 1rem}
  .modal-body-text .mt-chapter-num{font-size:3.5rem}
  .modal-body-text .mt-title{font-size:1.2rem}
}

/* ===== FLOATING BACK BUTTON ===== */
.float-back{
  display:none;position:fixed;top:80px;right:2vw;z-index:45;
  width:3.2rem;height:3.2rem;border-radius:50%;border:1.5px solid #CBD5E1;cursor:pointer;
  background:#fff;box-shadow:0 0 20px rgba(0,0,0,0.08),0 4px 16px rgba(0,0,0,0.06);
  color:#475569;transition:all 0.35s cubic-bezier(0.4,0,0.2,1);
  align-items:center;justify-content:center;
}
.float-back.active{display:flex}
.float-back:hover{
  background:#F1F5F9;border-color:#0EA5E9;color:#0EA5E9;
  box-shadow:0 0 32px rgba(14,165,233,0.15),0 6px 24px rgba(0,0,0,0.1);
  transform:scale(1.08);
}
.float-back:active{transform:scale(0.95)}
.float-back svg{width:1.3rem;height:1.3rem}
/* Tooltip on hover — matching v2 style */
.float-back::after{
  content:'返回上一层';position:absolute;right:calc(100% + 12px);top:50%;transform:translateY(-50%);
  padding:6px 14px;border-radius:8px;font-size:0.8rem;font-family:'Noto Sans SC',sans-serif;
  white-space:nowrap;color:#0EA5E9;background:rgba(255,255,255,0.95);
  border:1px solid rgba(14,165,233,0.3);pointer-events:none;
  opacity:0;transition:opacity 0.25s;
}
.float-back:hover::after{opacity:1}
@media(min-width:1024px){.float-back{top:90px;width:3.6rem;height:3.6rem}.float-back svg{width:1.5rem;height:1.5rem}}

/* ===== 4K ===== */
@media(min-width:1920px){html{font-size:18px}}
@media(min-width:2560px){html{font-size:20px}}