/* ================================================================
   QINGQIU WORLD — Shan Hai Jing theme, light palette.
   ================================================================ */

:root {
  --page:       #fdf9ed;
  --card-bg:    #ffffff;
  --ink:        #2c2320;
  --ink-mid:    #5c4f48;
  --ink-dim:    #9a8d84;
  --cinnabar:   #c75b39;
  --cinnabar-dim:#a34a2e;
  --cinnabar-pale: rgba(199, 91, 57, 0.07);
  --jade:       #6b8e6a;
  --jade-dim:   #4a6e48;
  --azurite:    #5b7a9a;
  --azurite-dim:#3d5a72;
  --gold:       #b89440;
  --gold-dim:   #8a6d30;
  --border:     rgba(140, 110, 70, 0.18);
  --shadow:     0 2px 16px rgba(80, 60, 30, 0.05);
  --serif:      'Noto Serif SC', 'Source Han Serif SC', 'STSong', 'Songti SC', Georgia, serif;
  --sans:       'Inter', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  background: var(--page);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.8;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* --- Lang toggle --- */
.lang-toggle {
  position: fixed;
  top: 1.5rem;
  right: 2rem;
  z-index: 100;
  display: flex;
  gap: 0;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  font-family: var(--serif);
}

.lang-toggle button {
  background: none;
  border: 1px solid var(--border);
  color: var(--ink-dim);
  padding: 0.3rem 0.75rem;
  cursor: pointer;
  transition: color 0.3s, border-color 0.3s, background 0.3s;
  font-family: inherit;
  font-size: inherit;
  letter-spacing: inherit;
}

.lang-toggle button:first-child { border-radius: 2px 0 0 2px; }
.lang-toggle button:last-child  { border-radius: 0 2px 2px 0; }

.lang-toggle button.active {
  color: var(--cinnabar);
  border-color: var(--cinnabar-dim);
  background: var(--cinnabar-pale);
}

.lang-toggle button:hover { color: var(--cinnabar); }

/* --- Page wrapper --- */
.page-wrapper {
  position: relative;
  /* body background #fdf9ed fills the space between the two fixed images */
}

.bg-head {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: auto;
  opacity: 0.45;
  pointer-events: none;
  z-index: 0;
}

.bg-body {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: auto;
  opacity: 0.45;
  pointer-events: none;
  z-index: 0;
}

main {
  position: relative;
  z-index: 1;
}

section {
  padding: 8rem 2rem;
  max-width: 960px;
  margin: 0 auto;
}

/* --- HERO --- */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 4rem 2rem;
  position: relative;
}

.hero h1 {
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink);
  margin-bottom: 0.3rem;
}

.hero h1 .zh {
  display: block;
  font-size: clamp(3.5rem, 8vw, 6.5rem);
  letter-spacing: 0.08em;
  color: var(--cinnabar);
}

.hero h1 .en {
  display: none;
  font-size: clamp(1rem, 2vw, 1.35rem);
}

.lang-en .hero h1 .en { display: block; }

.hero .tagline {
  font-family: var(--serif);
  font-size: clamp(1rem, 2vw, 1.35rem);
  font-style: italic;
  color: var(--ink-mid);
  opacity: 0.7;
  margin-bottom: 1rem;
  letter-spacing: 0.03em;
}

.hero .subtitle {
  font-size: 0.95rem;
  color: var(--ink-dim);
  max-width: 540px;
  margin: 0 auto;
  letter-spacing: 0.02em;
  line-height: 1.9;
}

.scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--ink-dim);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  animation: float 2.5s ease-in-out infinite;
  opacity: 0.5;
}
@keyframes float {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%      { transform: translateX(-50%) translateY(8px); }
}

/* --- SECTION HEADERS --- */
.section-label {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cinnabar-dim);
  margin-bottom: 1rem;
  opacity: 0.7;
}

.section-title {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: 2.5rem;
  color: var(--ink);
}

.section-title::after {
  content: '';
  display: block;
  width: 36px;
  height: 2px;
  background: var(--cinnabar);
  margin-top: 1rem;
  opacity: 0.4;
}

/* --- ABOUT --- */
.about .content {
  max-width: 640px;
  margin: 0 auto;
}

.about .content p {
  color: var(--ink-mid);
  font-size: 0.95rem;
  line-height: 2.1;
  letter-spacing: 0.02em;
  margin-bottom: 1.5rem;
}

/* --- PILLARS --- */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
}

.pillar-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 2rem 1.5rem;
  transition: border-color 0.4s, box-shadow 0.4s;
  box-shadow: var(--shadow);
}

.pillar-card:hover {
  border-color: var(--cinnabar-dim);
  box-shadow: 0 4px 24px var(--cinnabar-pale);
}

.pillar-card h3 {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--cinnabar);
}

.pillar-card p {
  color: var(--ink-mid);
  font-size: 0.88rem;
  line-height: 1.8;
  letter-spacing: 0.02em;
}

/* --- COMING SECTION --- */
.coming-section {
  text-align: center;
}

.coming-content {
  max-width: 500px;
  margin: 0 auto;
}

.coming-content p {
  color: var(--ink-mid);
  font-size: 0.95rem;
  line-height: 2.1;
  letter-spacing: 0.02em;
}

/* --- NAME SECTION --- */
.name-section .shj {
  font-family: var(--serif);
  font-size: 1.05rem;
  color: var(--ink);
  line-height: 2.4;
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
  letter-spacing: 0.04em;
}

.name-section .shj em {
  font-style: normal;
  font-weight: 600;
}

/* --- FOOTER --- */
footer {
  text-align: center;
  padding: 4rem 2rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--ink-dim);
  letter-spacing: 0.06em;
}

footer a {
  color: var(--cinnabar-dim);
  text-decoration: none;
  transition: color 0.3s;
}
footer a:hover { color: var(--cinnabar); }

/* --- FADE-IN --- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- RESPONSIVE --- */
@media (max-width: 768px) {
  section { padding: 4rem 1.5rem; }
  .pillars-grid { grid-template-columns: 1fr; }
  .lang-toggle { top: 1rem; right: 1rem; }
}