/* -----------------------------
   1) Font & Resets
----------------------------- */
@font-face {
  font-family: "InterVar";
  src: url("fonts/Inter-Variable.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
:root{
  --bg:#fafafa;
  --ink:#141418;
  --muted:#6b7280;
  --line:#e5e7eb;
  --card:#ffffff;
  --accent:#0f766e;
  --accent-ink:#ecfeff;
  --radius:14px;
  --gap:20px;
  --max:1200px;
}
*,
*::before,
*::after{
  box-sizing:border-box;
}
html,body{
  height:100%;
}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family: InterVar, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
  line-height:1.6;

  /* mobile-first：单列布局 */
  display:grid;
  grid-template-columns: minmax(0,1fr);
  grid-template-rows: auto 1fr auto;
  grid-template-areas:
    "header"
    "main"
    "footer";
  min-height:100dvh;
}

/* 所有图片 / 视频默认自适应 */
img,
video{
  max-width:100%;
  height:auto;
  display:block;
}

/* -----------------------------
   2) Layout: with / without sidebar
----------------------------- */
.site-header{ grid-area:header; }
.site-main{ grid-area:main; }
.site-footer{ grid-area:footer; }
.site-sidebar{
  grid-area:sidebar;
}

/* 有 sidebar 的页面：小屏时就按“上下堆叠”显示 */
body.has-sidebar{
  grid-template-columns: minmax(0,1fr);
  grid-template-rows: auto auto 1fr auto;
  grid-template-areas:
    "header"
    "sidebar"
    "main"
    "footer";
}

/* 无 sidebar 的页面可以保持默认（上面 body{} 的 header-main-footer） */
body.no-sidebar{
  /* 不额外改就行 */
}

/* >= 900px：桌面端开启两列布局 */
@media (min-width: 900px){
  body.has-sidebar{
    grid-template-columns: 260px minmax(0,1fr);
    grid-template-rows: auto 1fr auto;
    grid-template-areas:
      "header header"
      "sidebar main"
      "footer footer";
  }

  .site-sidebar{
    border-right:1px solid var(--line);
    background:#fff;
  }
}


/* -----------------------------
   3) Header + Nav
----------------------------- */
.site-header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: var(--gap);
  padding:12px 18px;
  border-bottom:1px solid var(--line);
  background:#fff;
}
.logo{
  font-weight:800;
  letter-spacing:.3px;
  text-decoration:none;
  color:var(--ink);
  font-size:18px;
}
.main-nav .nav-list{
  display:flex;
  gap:12px;
  list-style:none;
  margin:0;
  padding:0;
}
.main-nav a{
  text-decoration:none;
  color:var(--ink);
  padding:6px 10px;
  border-radius:8px;
  font-size:14px;
}
.main-nav a:hover,
.nav-list .is-active a,
.main-nav a[aria-current="page"]{
  background:var(--ink);
  color:#fff;
}

/* 小屏时导航自动换行 */
@media (max-width: 640px){
  .site-header{
    flex-direction:column;
    align-items:flex-start;
  }
  .main-nav .nav-list{
    flex-wrap:wrap;
  }
}

/* -----------------------------
   4) Sidebar 内容
----------------------------- */
.site-sidebar{
  padding:10px;
  font-size: 14px; 
}
.side-title{
  margin: 0 0 6px;
  font-size: 13px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .06em;
}
.side-group{
  margin: 8px 0 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  overflow: hidden;
}
.side-group > summary{
  cursor: pointer;
  padding: 10px 12px;
  font-weight: 700;
  list-style: none;
  outline: none;
}
.side-group[open] > summary{ background: #f8fafc; }
.side-group__title::-webkit-details-marker{ display:none; }

.side-list{
  list-style:none;
  margin:0;
  padding:6px 10px 10px;
  display:flex;
  flex-direction:column;
  gap:6px;
}
.side-list a{
  display:block;
  padding:6px 8px;
  color:var(--ink);
  text-decoration:none;
  border-radius:8px;
}
.side-list a:hover{ background:#f3f4f6; }
.side-list .is-active > a,
.side-list a[aria-current="page"]{
  background: var(--ink);
  color: #fff;
}

.side-caption{
  display:block;
  margin:8px 0 2px;
  font-weight:700;
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .06em;
}
.side-sub{
  list-style:none;
  margin: 0 0 6px 10px;
  padding: 0;
  border-left: 2px solid var(--line);
}
.side-sub li a{
  padding:6px 8px;
  border-radius:8px;
}

/* Page TOC */
.side-toc{
  margin-top: 18px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
}
.toc-list{
  margin: 6px 0 0;
  padding-left: 18px;
  display: grid;
  gap: 6px;
}
.toc-list a{
  text-decoration:none;
  color: var(--ink);
  border-radius: 8px;
  padding: 4px 4px;
}
.toc-list a:hover{ background:#f3f4f6; }

/* -----------------------------
   5) Main & Footer
----------------------------- */
.site-main{
  max-width: var(--max);
  width: 100%;
  margin: 0 auto;
  padding: 20px 16px 24px;
}
.site-footer{
  padding: 16px 16px 20px;
  border-top:1px solid var(--line);
  color:var(--muted);
  background:#fff;
  font-size: 13px;
}

/* -----------------------------
   6) Home: Hero + Cards
----------------------------- */
.hero{
  text-align:center;
  margin: 8px auto 12px;
}
.hero__title{ 
  font-size: clamp(28px, 3.5vw, 44px);
  line-height:1.2;
  margin:0 0 6px;
}
.hero__subtitle{ 
  color:var(--muted); 
  margin:0;
}

.hero-body {
  display: flex;               
  align-items: flex-start;     
  justify-content: center;     
  gap: 2rem;                  
  flex-wrap: wrap;             
  margin-top: 16px;
}

.hero-illustration {
  flex: 1 1 280px;             
  max-width: 420px;
  background: #ddd;
  border-radius: var(--radius);
  overflow: hidden;
}

.card-grid {
  flex: 1 1 260px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.card {
  flex: 1 1 minmax(220px, 1fr);
  min-width: 220px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 1px 0 rgba(0, 0, 0, .03);
  transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover { 
  transform: translateY(-4px); 
  box-shadow: 0 6px 16px rgba(0,0,0,.08);
}

/* stack hero on small screens */
@media (max-width: 768px) {
  .hero-body { 
    flex-direction: column; 
    gap: 16px;
  }
}

/* -----------------------------
   7) Section Header / Buttons
----------------------------- */
.section-header{
  display:flex;               
  justify-content:space-between;
  align-items:center;
  gap:var(--gap);
  margin-bottom:14px;
}
.section-title{
  margin:0;
  font-size: clamp(22px, 3vw, 32px);
}
.btn{
  display:inline-block;
  padding:8px 12px;
  border-radius:10px;
  text-decoration:none;
  font-weight:600;
  font-size:14px;
}
.btn--ghost{
  color:var(--ink);
  border:1px solid var(--line);
  background:#f3f4f6;
}

/* 小屏按钮换行到下一行 */
@media (max-width: 480px){
  .section-header{
    flex-direction:column;
    align-items:flex-start;
  }
}

/* -----------------------------
   8) Intro / article layout
----------------------------- */
.page-body{
  background:#fff;
  border-radius:var(--radius);
  border:1px solid var(--line);
  padding: clamp(14px, 2.2vw, 20px);
}

/* 有图的两栏布局：在 intro/key figures 里用 .two-col */
.page-body.two-col{
  display:grid;
  grid-template-columns: 1fr 320px;
  gap: var(--gap);
}
.page-body .media-right img{
  border-radius: 10px;
  background:#ddd;
}
.col--full{ grid-column:1 / -1; }

@media (max-width: 720px){
  .page-body.two-col{
    grid-template-columns: 1fr;
  }
}

/* Prose helpers */
.prose h2{
  margin: 18px 0 6px;
  font-size: clamp(18px, 2.2vw, 22px);
}
.prose p{ margin: 0 0 10px; }

/* -----------------------------
   9) Key Themes layout
----------------------------- */
.virtue-grid{
  display: grid;
  grid-template-columns: 140px 1fr; 
  gap: var(--gap);
  align-items: stretch;
}

.virtue-kanji{
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f3f4f6;
  border: 1px solid var(--line);
  border-radius: 12px;
  font-weight: 800;
  font-size: clamp(28px, 4.2vw, 40px); 
  letter-spacing: .1em;
  line-height: 1;
  color: var(--ink);
}

.virtue-explain{
  background:#fff;
  border:1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(14px, 2vw, 18px);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.virtue-explain h3{
  margin:0 0 4px;
  font-size: clamp(18px, 2.2vw, 22px);
}
.virtue-explain p{
  margin:0;
}

@media (max-width: 720px){
  .virtue-grid{
    grid-template-columns: 1fr;       
    gap: 12px;
  }
  .virtue-kanji{ padding:16px 0; }
}

/* =============================
   The Three States page
============================= */
.states-row{
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 24px;
  padding: 18px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x mandatory;
}

.state-card{
  scroll-snap-align: start;
  flex: 0 0 clamp(240px, 28vw, 360px); 
  height: clamp(160px, 24vw, 220px);
  border-radius: 18px;
  border: 1px solid var(--line);
  box-shadow: 0 8px 20px rgba(0,0,0,.08), inset 0 1px 0 rgba(255,255,255,.2);
  background: #fff;
  position: relative;
  padding: 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  isolation: isolate; 
  transition: transform .18s ease, box-shadow .18s ease, filter .18s ease;
}
.state-cn{
  font-weight: 900;
  font-size: clamp(48px, 6vw, 72px);
  line-height: 1;
  margin-bottom: 6px;
  color: #fff;
  text-shadow: 0 2px 6px rgba(0,0,0,.25);
  letter-spacing: .06em;
}
.state-en{
  font-weight: 800;
  font-size: clamp(18px, 2.2vw, 22px);
  letter-spacing: .18em;
  color: #f8fafc;
  text-shadow: 0 1px 3px rgba(0,0,0,.25);
}
.state-wei{
  background: linear-gradient(135deg, #1e3a8a 0%, #0a246a 100%);
}
.state-shu{
  background: linear-gradient(135deg, #b91c1c 0%, #8a1111 100%);
}
.state-wu{
  background: linear-gradient(135deg, #065f46 0%, #044434 100%);
}
.state-card:hover{
  transform: translateY(-6px);
  box-shadow: 0 14px 28px rgba(0,0,0,.18), 0 0 0 2px rgba(255,255,255,.2) inset;
  filter: saturate(1.1);
}

@media (max-width: 640px){
  .states-row{
    gap: 16px;
    padding-inline: 12px;
  }
  .state-card{
    flex-basis: 82vw; 
    height: 46vw;
  }
}

/* -----------------------------
   10) Accessibility helpers
----------------------------- */
.visually-hidden{
  position:absolute !important;
  height:1px;width:1px;overflow:hidden;
  clip:rect(1px,1px,1px,1px);
  white-space:nowrap;border:0;padding:0;margin:-1px;
}

/* -----------------------------
   11) Responsive YouTube video
----------------------------- */
.video-wrapper {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%;
  margin: 20px 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: #000;
}
.video-wrapper iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* -----------------------------
   12) Key Figures Grid
----------------------------- */
.figures-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.8rem;
  margin-top: 2rem;
}
.figure-card {
  background: #fafafa;
  border-radius: 10px;
  padding: 1rem;
  text-align: center;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}
.figure-card h3 {
  margin-top: 0.8rem;
  margin-bottom: 0.4rem;
}
.figure-img-large {
  width: 100%;
  border-radius: 6px;
}
.figure-img-small-wrap {
  margin-top: 0.8rem;
}
.figure-img-small {
  width: 60%;
  max-width: 180px;
  border-radius: 6px;
}
@media (max-width: 600px) {
  .figure-img-small {
    width: 80%;
  }
}

/* -----------------------------
   13) Three Kingdoms Survey
----------------------------- */
.survey-section {
  margin-top: 28px;
  background: #ffffff;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  padding: 22px 24px;
  max-width: 720px;
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.04);
}
.survey-title {
  margin: 0 0 4px;
  font-size: clamp(20px, 2.4vw, 26px);
}
.survey-intro {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 14px;
}
.survey-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.survey-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 14px;
}
.survey-group legend {
  display: block;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
}
.survey-form label {
  display: block;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 4px;
}
.survey-options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}
.survey-options label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 400;
}
.survey-form input[type="email"],
.survey-form select,
.survey-form textarea {
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid #d1d5db;
  font: inherit;
  color: var(--ink);
  background: #ffffff;
  min-height: 38px;
  box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.04);
}
.survey-form select {
  padding-right: 36px;
}
.survey-form textarea {
  min-height: 110px;
  resize: vertical;
}
.survey-form input[type="email"]:focus,
.survey-form select:focus,
.survey-form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(15, 118, 110, 0.25);
}
.survey-submit {
  align-self: flex-start;
  padding: 9px 18px;
  border-radius: 999px;
  border: none;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
  cursor: pointer;
  font-size: 14px;
}
.survey-submit:hover {
  opacity: 0.95;
}
@media (max-width: 600px) {
  .survey-section {
    padding: 18px 16px;
  }
}

/* JS button style */
.btn--primary{
  color: var(--accent-ink);
  background: var(--accent);
  border: 1px solid var(--accent);
}
.btn--primary:hover{
  opacity: 0.95;
}

/* -----------------------------
   Daily quote section
----------------------------- */
.daily-section{
  margin-top: 24px;
  padding: 16px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: #ffffff;
}
.daily-title{
  margin: 0 0 4px;
  font-size: clamp(18px, 2.4vw, 22px);
}
.daily-caption{
  margin: 0 0 10px;
  font-size: 14px;
  color: var(--muted);
}
.daily-quote-text{
  margin: 0 0 12px;
  font-style: italic;
}
.daily-actions{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
@media (max-width: 480px){
  .daily-actions{
    flex-direction: column;
    align-items: flex-start;
  }
}

/* -----------------------------
   Focus mode
----------------------------- */
body.focus-mode{
  background: #020617;
  color: #f9fafb;
}

body.focus-mode .site-header,
body.focus-mode .site-footer,
body.focus-mode .site-sidebar{
  background: #020617;
  color: #f9fafb;
  border-color: #1e293b;
}

body.focus-mode .page-body,
body.focus-mode .card,
body.focus-mode .survey-section,
body.focus-mode .daily-section{
  background: #0f172a;
  color: #f9fafb;
  border-color: #1e293b;
}

body.focus-mode .prose p,
body.focus-mode .prose li,
body.focus-mode .daily-quote-text{
  color: #f8fafc;
}

body.focus-mode a{
  color: #38bdf8;
}

body.focus-mode .card:hover{
  box-shadow: 0 6px 16px rgba(15,23,42,0.9);
}