/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{
  font-family:'Manrope','Noto Sans SC',-apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei',system-ui,sans-serif;
  font-size:1rem;
  line-height:1.6;
  color:oklch(18% 0.012 260);
  background:oklch(98.5% 0.005 260);
  -webkit-font-smoothing:antialiased;
  font-feature-settings:"ss01","cv11"
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
/* ===== Typography ===== */
h1,h2,h3,.heading-font{
  font-family:'Noto Sans SC','Manrope',sans-serif;
  font-weight:900;
  line-height:1.1;
  letter-spacing:-0.03em;
  font-feature-settings:"ss01"
}
h1{
  font-size:clamp(2.5rem,6vw,4.75rem);
  font-weight:900
}
h2{font-size:clamp(1.875rem,3.5vw,3rem);margin-bottom:0.5em;font-weight:900}
h3{font-size:clamp(1.125rem,2vw,1.5rem);font-weight:700}
.section-label{
  display:inline-block;
  font-size:0.75rem;
  font-weight:700;
  letter-spacing:0.18em;
  text-transform:uppercase;
  color:oklch(55% 0.18 255);
  margin-bottom:1.25rem;
  position:relative;
  padding-left:2.5rem;
  font-family:'JetBrains Mono','Manrope',monospace
}
.section-label::before{
  content:'';
  position:absolute;left:0;top:50%;
  width:1.75rem;height:2px;
  background:oklch(55% 0.18 255);
  transform:translateY(-50%)
}
/* ===== Container ===== */
.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}
/* ===== Navigation ===== */
nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:oklch(98.5% 0.005 260 / 0.85);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid oklch(92% 0.008 260)
}
.nav-inner{
  display:flex;align-items:center;justify-content:space-between;
  max-width:1200px;margin:0 auto;
  padding:0 1.5rem;height:64px
}
.logo{
  display:flex;align-items:center;gap:0.625rem;
  color:oklch(18% 0.012 260)
}
.logo-mark{
  width:34px;height:34px;
  border-radius:9px;
  background:linear-gradient(135deg, oklch(55% 0.18 255), oklch(45% 0.15 280));
  display:flex;align-items:center;justify-content:center;
  color:#fff;
  box-shadow:0 2px 8px oklch(55% 0.18 255 / 0.3);
  flex-shrink:0
}
.logo-mark svg{display:block}
.logo-text{
  display:flex;flex-direction:column;line-height:1.1
}
.logo-text .logo-name{
  font-family:'Noto Sans SC','Manrope',sans-serif;
  font-size:1.125rem;font-weight:700;
  color:oklch(18% 0.012 260);
  letter-spacing:-0.01em
}
.logo-text .logo-name span{color:oklch(55% 0.18 255)}
.logo-text .logo-sub{
  font-size:0.625rem;font-weight:600;
  color:oklch(60% 0.01 260);
  letter-spacing:0.12em;
  text-transform:uppercase;
  margin-top:0.125rem
}
.nav-links{display:flex;gap:2rem;list-style:none}
.nav-links a{
  font-size:0.875rem;font-weight:500;
  color:oklch(45% 0.01 260);
  transition:color 0.2s;
  position:relative
}
.nav-links a::after{
  content:'';position:absolute;bottom:-4px;left:0;
  width:0;height:2px;background:oklch(55% 0.18 255);
  transition:width 0.3s
}
.nav-links a:hover{color:oklch(18% 0.012 260)}
.nav-links a:hover::after{width:100%}
.nav-cta{
  padding:0.5rem 1.25rem;
  border-radius:8px;
  background:oklch(55% 0.18 255);
  color:#fff !important;
  font-size:0.875rem;font-weight:600;
  transition:transform 0.2s,box-shadow 0.2s
}
.nav-cta:hover{transform:translateY(-1px);box-shadow:0 4px 16px oklch(55% 0.18 255 / 0.3)}
/* Mobile nav toggle */
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:0.5rem}
.nav-toggle span{
  display:block;width:24px;height:2px;
  background:oklch(18% 0.012 260);
  margin:5px 0;transition:0.3s;
  border-radius:2px
}
/* ===== Hero ===== */
.hero{
  padding:7.5rem 0 5rem;
  position:relative;
  overflow:hidden;
  background:
    linear-gradient(180deg, oklch(96% 0.008 260) 0%, oklch(98.5% 0.005 260) 100%)
}
.hero::before{
  content:'';
  position:absolute;inset:0;
  background-image:
    linear-gradient(oklch(55% 0.18 255 / 0.04) 1px, transparent 1px),
    linear-gradient(90deg, oklch(55% 0.18 255 / 0.04) 1px, transparent 1px);
  background-size:48px 48px;
  mask-image:radial-gradient(ellipse at center, black 30%, transparent 75%);
  -webkit-mask-image:radial-gradient(ellipse at center, black 30%, transparent 75%);
  pointer-events:none;
  z-index:0
}
.hero::after{
  content:'';
  position:absolute;top:18%;right:5%;
  width:320px;height:320px;
  border-radius:50%;
  background:radial-gradient(circle, oklch(55% 0.18 255 / 0.07) 0%, transparent 70%);
  pointer-events:none;
  z-index:0
}
.hero .container{position:relative;z-index:1}
.hero-grid{
  display:grid;
  grid-template-columns:1.05fr 1fr;
  gap:3.5rem;
  align-items:center
}
.hero-content{position:relative;z-index:2}
.hero-badge{
  display:inline-flex;align-items:center;gap:0.5rem;
  padding:0.4375rem 1rem 0.4375rem 0.5rem;
  border-radius:100px;
  border:1px solid oklch(55% 0.18 255 / 0.25);
  background:oklch(55% 0.18 255 / 0.06);
  font-size:0.75rem;font-weight:600;
  color:oklch(40% 0.15 255);
  margin-bottom:1.75rem;
  letter-spacing:0.05em;
  text-transform:uppercase;
  font-family:'JetBrains Mono','Manrope',monospace
}
.hero-badge-dot{
  display:inline-block;width:8px;height:8px;
  border-radius:50%;
  background:oklch(55% 0.18 255);
  margin-right:0.25rem;
  box-shadow:0 0 0 4px oklch(55% 0.18 255 / 0.2);
  animation:pulse 2s ease-in-out infinite
}
@keyframes pulse{
  0%,100%{box-shadow:0 0 0 4px oklch(60% 0.22 25 / 0.2)}
  50%{box-shadow:0 0 0 8px oklch(60% 0.22 25 / 0)}
}
.hero h1{
  max-width:14ch;
  margin-bottom:1.25rem;
  color:oklch(15% 0.012 260)
}
.hero h1 em{
  font-style:normal;
  background:linear-gradient(135deg, oklch(55% 0.18 255), oklch(45% 0.15 280));
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text
}
.hero-lead{
  font-size:1.125rem;
  color:oklch(50% 0.015 260);
  max-width:55ch;
  line-height:1.7;
  margin-bottom:2.5rem
}
.hero-actions{
  display:flex;gap:1rem;flex-wrap:wrap
}
.btn{
  display:inline-flex;align-items:center;gap:0.5rem;
  padding:0.875rem 1.75rem;
  border-radius:8px;
  font-size:0.9375rem;font-weight:700;
  transition:all 0.2s;
  cursor:pointer;border:none;
  letter-spacing:-0.005em
}
.btn-primary{
  background:oklch(55% 0.18 255);
  color:#fff;
  box-shadow:0 2px 8px oklch(55% 0.18 255 / 0.25)
}
.btn-primary:hover{
  transform:translateY(-2px);
  box-shadow:0 6px 24px oklch(55% 0.18 255 / 0.35)
}
.btn-secondary{
  background:oklch(92% 0.008 260);
  color:oklch(18% 0.012 260);
  border:1px solid oklch(88% 0.01 260)
}
.btn-secondary:hover{background:oklch(88% 0.01 260);transform:translateY(-2px)}
/* Hero stats */
.hero-stats{
  display:flex;gap:3rem;margin-top:3.5rem;
  padding-top:2.5rem;
  border-top:1px solid oklch(90% 0.008 260)
}
.hero-stat-number{
  font-family:'Noto Sans SC','Manrope',sans-serif;
  font-size:2rem;font-weight:700;
  color:oklch(18% 0.012 260);
  line-height:1
}
.hero-stat-label{
  font-size:0.8125rem;
  color:oklch(55% 0.015 260);
  margin-top:0.25rem
}
/* Hero visual (right side floating cards) */
.hero-visual{
  position:relative;
  height:520px;
  z-index:1
}
.fcard{
  position:absolute;
  background:#fff;
  border-radius:10px;
  border:1px solid oklch(15% 0.012 260 / 0.08);
  box-shadow:0 4px 24px oklch(15% 0.012 260 / 0.06), 0 1px 3px oklch(15% 0.012 260 / 0.04);
  padding:1rem 1.25rem;
  transition:transform 0.4s cubic-bezier(0.16,1,0.3,1)
}
.fcard:hover{transform:translateY(-4px) scale(1.02)}
.fcard-head{
  display:flex;align-items:center;justify-content:space-between;
  margin-bottom:0.625rem
}
.fcard-tag{
  font-size:0.6875rem;font-weight:700;
  padding:0.25rem 0.5rem;border-radius:4px;
  letter-spacing:0.04em;
  text-transform:uppercase;
  font-family:'JetBrains Mono','Manrope',monospace
}
.fcard-tag.math{background:oklch(55% 0.18 255 / 0.1);color:oklch(45% 0.15 255)}
.fcard-tag.phys{background:oklch(65% 0.18 55 / 0.12);color:oklch(50% 0.16 50)}
.fcard-tag.eng{background:oklch(50% 0.15 180 / 0.12);color:oklch(40% 0.14 180)}
.fcard-tag.hle{background:oklch(35% 0.12 255);color:#fff}
.fcard-id{font-size:0.6875rem;color:oklch(65% 0.008 260);font-weight:500;font-family:'JetBrains Mono','Manrope',monospace}
.fcard-q{
  font-size:0.875rem;font-weight:600;
  color:oklch(15% 0.012 260);
  line-height:1.45;
  margin-bottom:0.625rem
}
.fcard-opts{
  display:flex;flex-direction:column;gap:0.375rem
}
.fcard-opt{
  font-size:0.75rem;color:oklch(45% 0.01 260);
  padding:0.375rem 0.5rem;
  background:oklch(96% 0.005 260);
  border-radius:5px;
  display:flex;align-items:center;gap:0.5rem
}
.fcard-opt .opt-letter{
  width:14px;height:14px;border-radius:50%;
  background:oklch(90% 0.008 260);
  display:flex;align-items:center;justify-content:center;
  font-size:0.625rem;font-weight:700;color:oklch(40% 0.01 260);
  flex-shrink:0
}
.fcard-opt.correct{background:oklch(55% 0.18 255 / 0.08);color:oklch(40% 0.15 255)}
.fcard-opt.correct .opt-letter{background:oklch(55% 0.18 255);color:#fff}
/* Individual card positions */
.fcard-1{
  top:0;left:8%;
  width:240px;
  animation:floatA 6s ease-in-out infinite
}
.fcard-2{
  top:30%;right:0;
  width:260px;
  animation:floatB 7s ease-in-out infinite
}
.fcard-3{
  bottom:8%;left:0;
  width:230px;
  animation:floatA 8s ease-in-out infinite reverse
}
.fcard-4{
  bottom:25%;right:18%;
  width:170px;
  padding:0.875rem 1rem;
  animation:floatB 5.5s ease-in-out infinite
}
.fcard-4 .fcard-q{font-size:0.8125rem;margin-bottom:0.375rem}
.fcard-4 .fcard-meta{
  display:flex;align-items:center;gap:0.5rem;
  font-size:0.75rem;color:oklch(55% 0.01 260)
}
.fcard-4 .fcard-score{
  margin-left:auto;
  font-family:'Noto Sans SC','Manrope',sans-serif;
  font-size:1.25rem;font-weight:700;
  color:oklch(55% 0.18 255)
}
.fcard-4 .fcard-bar{
  height:4px;background:oklch(94% 0.008 260);
  border-radius:2px;overflow:hidden;margin-top:0.5rem
}
.fcard-4 .fcard-bar-fill{
  display:block;height:100%;width:78%;
  background:linear-gradient(90deg, oklch(55% 0.18 255), oklch(45% 0.15 280));
  border-radius:2px
}
@keyframes floatA{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-10px)}
}
@keyframes floatB{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(8px)}
}
/* ===== Section common ===== */
section{padding:5rem 0}
.section-header{
  text-align:center;margin-bottom:3.5rem
}
.section-header p{
  font-size:1.0625rem;
  color:oklch(50% 0.015 260);
  max-width:55ch;margin:0 auto;
  line-height:1.7
}
/* ===== Data Assets ===== */
.assets-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(260px, 1fr));
  gap:1rem
}
.asset-card{
  position:relative;
  padding:1.75rem;
  border-radius:12px;
  background:#fff;
  border:1px solid oklch(92% 0.008 260);
  transition:all 0.3s;
  overflow:hidden
}
.asset-card::before{
  content:'';
  position:absolute;top:0;left:0;right:0;
  height:3px;
  background:oklch(55% 0.18 255);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform 0.4s
}
.asset-card:hover::before{transform:scaleX(1)}
.asset-card:hover{
  border-color:oklch(55% 0.18 255 / 0.3);
  transform:translateY(-3px);
  box-shadow:0 8px 32px oklch(0% 0 0 / 0.06)
}
.asset-card-icon{
  width:40px;height:40px;border-radius:10px;
  display:flex;align-items:center;justify-content:center;
  font-size:1.25rem;
  margin-bottom:1rem;
  background:oklch(55% 0.18 255 / 0.08);
  color:oklch(50% 0.16 255)
}
.asset-card:nth-child(2) .asset-card-icon{background:oklch(65% 0.18 55 / 0.1);color:oklch(55% 0.18 55)}
.asset-card:nth-child(3) .asset-card-icon{background:oklch(50% 0.15 180 / 0.1);color:oklch(45% 0.14 180)}
.asset-card:nth-child(4) .asset-card-icon{background:oklch(60% 0.12 300 / 0.1);color:oklch(50% 0.12 300)}
.asset-card:nth-child(5) .asset-card-icon{background:oklch(70% 0.15 80 / 0.1);color:oklch(55% 0.15 80)}
.asset-card h3{font-size:1.0625rem;margin-bottom:0.5rem}
.asset-card p{
  font-size:0.875rem;color:oklch(52% 0.01 260);
  line-height:1.6;margin-bottom:1rem
}
.asset-tags{display:flex;flex-wrap:wrap;gap:0.375rem}
.asset-tag{
  padding:0.1875rem 0.625rem;
  border-radius:100px;
  font-size:0.75rem;font-weight:500;
  background:oklch(95% 0.008 260);
  color:oklch(45% 0.01 260)
}
.asset-card.featured{
  grid-column:1/-1;
  display:grid;grid-template-columns:auto 1fr;gap:1.5rem;
  align-items:start;
  background:linear-gradient(135deg, oklch(55% 0.18 255 / 0.04), #fff 60%);
  border-color:oklch(55% 0.18 255 / 0.2)
}
.asset-card.featured .asset-card-icon{
  width:52px;height:52px;border-radius:12px;
  font-size:1.5rem;margin-bottom:0
}
/* ===== Core Business ===== */
.business-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:1.5rem
}
.business-card{
  padding:2.5rem 2rem;
  border-radius:12px;
  background:#fff;
  border:1px solid oklch(92% 0.008 260);
  transition:all 0.3s;
  position:relative
}
.business-card:hover{
  border-color:oklch(55% 0.18 255 / 0.25);
  transform:translateY(-4px);
  box-shadow:0 12px 40px oklch(0% 0 0 / 0.06)
}
.business-number{
  font-family:'Noto Sans SC','Manrope',sans-serif;
  font-size:3rem;font-weight:700;
  color:oklch(55% 0.18 255 / 0.12);
  line-height:1;
  margin-bottom:1rem
}
.business-card h3{font-size:1.125rem;margin-bottom:0.75rem}
.business-card p{
  font-size:0.875rem;color:oklch(52% 0.01 260);
  line-height:1.7;margin-bottom:1.25rem
}
.business-stats{
  display:flex;gap:1.5rem;
  padding-top:1rem;
  border-top:1px solid oklch(92% 0.008 260)
}
.business-stat-value{
  font-size:1.125rem;font-weight:700;
  color:oklch(18% 0.012 260)
}
.business-stat-label{
  font-size:0.75rem;color:oklch(52% 0.01 260);
  display:block;margin-top:0.125rem
}
.business-link{
  display:inline-flex;align-items:center;gap:0.375rem;
  font-size:0.875rem;font-weight:600;
  color:oklch(55% 0.18 255);
  margin-top:0.5rem
}
.business-link svg{transition:transform 0.2s}
.business-card:hover .business-link svg{transform:translateX(4px)}
/* ===== Disciplines ===== */
.discipline-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(200px,1fr));
  gap:0.75rem
}
.discipline-card{
  padding:1.25rem 1.5rem;
  border-radius:10px;
  background:#fff;
  border:1px solid oklch(92% 0.008 260);
  transition:all 0.25s;
  cursor:default
}
.discipline-card:hover{
  border-color:oklch(55% 0.18 255 / 0.3);
  background:oklch(55% 0.18 255 / 0.03);
  transform:translateY(-2px)
}
.discipline-card .emoji{font-size:1.25rem;margin-bottom:0.375rem}
.discipline-card h4{font-size:0.9375rem;font-weight:600;margin-bottom:0.25rem}
.discipline-card p{
  font-size:0.75rem;color:oklch(55% 0.01 260);
  line-height:1.5
}
/* ===== HLE Section ===== */
.hle-section{
  background:oklch(55% 0.18 255);
  color:#fff;
  padding:5rem 0;
  position:relative;
  overflow:hidden
}
.hle-section::before{
  content:'';
  position:absolute;top:-50%;right:-10%;
  width:800px;height:800px;
  border-radius:50%;
  background:oklch(100% 0 0 / 0.04);
  pointer-events:none
}
.hle-section .section-label{color:oklch(100% 0 0 / 0.7)}
.hle-section .section-label::before{background:#fff}
.hle-section h2{color:#fff}
.hle-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:3rem;
  align-items:center
}
.hle-info p{
  font-size:1rem;
  line-height:1.8;
  opacity:0.85;
  margin-bottom:2rem
}
.hle-meta{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:1.5rem
}
.hle-meta-item{text-align:center}
.hle-meta-value{
  font-family:'Noto Sans SC','Manrope',sans-serif;
  font-size:2rem;font-weight:700;
  color:#fff;
  line-height:1
}
.hle-meta-label{
  font-size:0.8125rem;
  opacity:0.65;
  margin-top:0.375rem
}
.hle-services{
  display:grid;gap:0.75rem
}
.hle-service-item{
  display:flex;gap:1rem;align-items:flex-start;
  padding:1.25rem;
  border-radius:10px;
  background:oklch(100% 0 0 / 0.08);
  transition:background 0.2s
}
.hle-service-item:hover{background:oklch(100% 0 0 / 0.12)}
.hle-service-num{
  font-family:'Noto Sans SC','Manrope',sans-serif;
  font-size:1.375rem;font-weight:700;
  opacity:0.4;
  line-height:1;
  flex-shrink:0;
  width:2rem
}
.hle-service-item h4{font-size:0.9375rem;font-weight:600;margin-bottom:0.25rem}
.hle-service-item p{
  font-size:0.8125rem;
  opacity:0.7;
  line-height:1.5
}
/* ===== Data Wall ===== */
.data-wall{
  padding:5rem 0;
  position:relative
}
.data-wall-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:2rem;
  text-align:center
}
.data-wall-item{position:relative}
.data-wall-item:not(:last-child)::after{
  content:'';
  position:absolute;right:-1rem;top:50%;
  width:1px;height:60%;
  background:oklch(88% 0.008 260);
  transform:translateY(-50%)
}
.data-wall-number{
  font-family:'Noto Sans SC','Manrope',sans-serif;
  font-size:clamp(2rem,4vw,3.25rem);
  font-weight:700;
  background:linear-gradient(135deg, oklch(55% 0.18 255), oklch(45% 0.15 280));
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
  line-height:1
}
.data-wall-label{
  font-size:0.875rem;
  color:oklch(50% 0.015 260);
  margin-top:0.5rem;
  font-weight:500
}
/* ===== Footer ===== */
footer{
  padding:4rem 0 2rem;
  border-top:1px solid oklch(90% 0.008 260)
}
.footer-grid{
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1fr;
  gap:3rem;
  margin-bottom:3rem
}
.footer-brand .logo{margin-bottom:0.75rem}
.footer-brand p{
  font-size:0.8125rem;
  color:oklch(55% 0.01 260);
  line-height:1.7;
  max-width:30ch
}
.footer-col h4{
  font-size:0.875rem;font-weight:600;
  margin-bottom:1rem;
  color:oklch(18% 0.012 260)
}
.footer-col a{
  display:block;
  font-size:0.8125rem;
  color:oklch(55% 0.01 260);
  padding:0.375rem 0;
  transition:color 0.2s
}
.footer-col a:hover{color:oklch(55% 0.18 255)}
.footer-bottom{
  padding-top:2rem;
  border-top:1px solid oklch(92% 0.008 260);
  display:flex;justify-content:space-between;align-items:center;
  font-size:0.75rem;color:oklch(60% 0.008 260)
}
/* ===== Responsive ===== */
@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr;gap:2rem}
  .hero-visual{height:auto;min-height:380px;margin-top:1rem}
}
@media(max-width:768px){
  .nav-links{display:none}
  .nav-links.open{
    display:flex;flex-direction:column;gap:0;
    position:absolute;top:64px;left:0;right:0;
    background:oklch(98.5% 0.005 260 / 0.98);
    backdrop-filter:blur(12px);
    border-bottom:1px solid oklch(92% 0.008 260);
    padding:0.5rem 1.5rem
  }
  .nav-links.open a{padding:0.75rem 0}
  .nav-toggle{display:block}
  .hero{padding:6rem 0 3rem}
  .hero-visual{height:360px;transform:scale(0.9);transform-origin:center top}
  .hero-stats{flex-wrap:wrap;gap:2rem}
  .business-grid{grid-template-columns:1fr}
  .hle-grid{grid-template-columns:1fr}
  .data-wall-grid{grid-template-columns:1fr 1fr;gap:2rem}
  .data-wall-item:not(:last-child)::after{display:none}
  .footer-grid{grid-template-columns:1fr 1fr;gap:2rem}
  .footer-bottom{flex-direction:column;gap:0.5rem;text-align:center}
  .asset-card.featured{grid-template-columns:1fr}
}
@media(max-width:480px){
  .hero-actions{flex-direction:column}
  .hero-visual{transform:scale(0.78);height:300px}
  .data-wall-grid{grid-template-columns:1fr 1fr;gap:1.5rem}
  .footer-grid{grid-template-columns:1fr}
}
/* ===== Page System ===== */
.page{display:none;animation:fadeIn 0.35s ease}
.page.active{display:block}
@keyframes fadeIn{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}
.page-inner{padding-top:64px}
.page-title{text-align:center;padding:4rem 0 2.5rem}
.page-title h2{font-size:clamp(1.5rem,3vw,2.5rem);margin-bottom:0.5rem}
.page-title p{font-size:0.9375rem;color:oklch(50% 0.015 260);max-width:50ch;margin:0 auto}
.nav-links a.active-link{color:oklch(55% 0.18 255)}
.nav-links a.active-link::after{width:100%}
.back-link{display:inline-flex;align-items:center;gap:0.375rem;font-size:0.875rem;font-weight:600;color:oklch(55% 0.18 255);margin-bottom:2rem;cursor:pointer;border:none;background:none;padding:0}
.back-link:hover{color:oklch(40% 0.15 255)}
/* Detail Page */
.detail-header{padding:2rem 0;display:flex;align-items:center;gap:1rem;flex-wrap:wrap}
.detail-header h2{flex:1;margin:0}
.detail-meta{display:flex;gap:1rem;flex-wrap:wrap;margin-bottom:2rem}
.detail-meta span{background:oklch(94% 0.008 260);padding:0.375rem 0.75rem;border-radius:6px;font-size:0.8125rem;color:oklch(40% 0.01 260)}
.detail-desc{font-size:0.9375rem;color:oklch(50% 0.015 260);line-height:1.7;margin-bottom:2rem;max-width:65ch}
.detail-actions{display:flex;gap:1rem;margin-bottom:2.5rem;flex-wrap:wrap}
/* Sample Question Preview */
.sample-box{background:#fff;border-radius:12px;border:1px solid oklch(92% 0.008 260);overflow:hidden;margin-bottom:3rem}
.sample-header{background:oklch(96% 0.005 260);padding:0.75rem 1.25rem;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:0.5rem}
.sample-header span{font-size:0.8125rem;font-weight:600}
.sample-header .sample-tag{font-size:0.6875rem;font-weight:600;padding:0.25rem 0.5rem;border-radius:4px;background:oklch(55% 0.18 255 / 0.1);color:oklch(45% 0.15 255);font-family:'JetBrains Mono','Manrope',monospace}
.sample-body{padding:1.5rem 1.25rem}
.sample-question{font-size:0.9375rem;line-height:1.7;margin-bottom:1.25rem}
.sample-question img{max-width:100%;height:auto}
.sample-options{display:flex;flex-direction:column;gap:0.5rem;margin-bottom:1.25rem}
.sample-option{font-size:0.875rem;padding:0.5rem 0.75rem;background:oklch(96% 0.005 260);border-radius:6px;cursor:pointer;transition:all 0.2s;border:1px solid transparent}
.sample-option:hover{background:oklch(55% 0.18 255 / 0.06);border-color:oklch(55% 0.18 255 / 0.2)}
.sample-option.correct{background:oklch(55% 0.18 255 / 0.08);border-color:oklch(55% 0.18 255);font-weight:600}
.sample-answer{display:none;padding:1rem 1.25rem;background:oklch(96% 0.005 260);border-top:1px solid oklch(92% 0.008 260);font-size:0.875rem;line-height:1.7}
.sample-answer.show{display:block}
.sample-answer strong{color:oklch(45% 0.15 255)}
.btn-show-answer{font-size:0.8125rem;font-weight:600;color:oklch(55% 0.18 255);cursor:pointer;border:none;background:none;padding:0}
.btn-show-answer:hover{color:oklch(40% 0.15 255)}
/* About Page */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:3rem;margin:2rem 0}
.about-card{background:#fff;border-radius:12px;border:1px solid oklch(92% 0.008 260);padding:2rem}
.about-card h3{font-size:1.125rem;margin-bottom:1rem}
.about-card p{font-size:0.875rem;color:oklch(50% 0.01 260);line-height:1.7;margin-bottom:1rem}
.about-card ul{list-style:none;padding:0}
.about-card ul li{padding:0.375rem 0;font-size:0.875rem;color:oklch(50% 0.01 260);padding-left:1.25rem;position:relative}
.about-card ul li::before{content:'●';position:absolute;left:0;color:oklch(55% 0.18 255);font-size:0.5rem;top:0.5625rem}
.contact-row{display:flex;gap:2rem;flex-wrap:wrap;margin-top:1.5rem}
.contact-item{display:flex;align-items:center;gap:0.75rem;padding:0.75rem 1.25rem;background:oklch(96% 0.005 260);border-radius:8px;font-size:0.875rem;font-weight:500}
.contact-item .icon{font-size:1.25rem}
.shop-header{text-align:center;margin-bottom:3rem}
.chip-row{display:flex;align-items:center;gap:0.75rem;flex-wrap:wrap;margin-bottom:0.875rem;padding-left:0.25rem}
.chip-label{font-size:0.8125rem;color:oklch(50% 0.01 260);font-weight:600;flex-shrink:0;min-width:2.5rem}
.chips{display:flex;gap:0.4rem;flex-wrap:wrap}
.chip{
  padding:0.4rem 0.875rem;border-radius:6px;
  font-size:0.8125rem;font-weight:500;
  background:oklch(95% 0.005 260);
  border:1px solid oklch(91% 0.008 260);
  color:oklch(40% 0.01 260);
  cursor:pointer;transition:all 0.18s
}
.chip:hover{border-color:oklch(55% 0.18 255 / 0.4);color:oklch(20% 0.012 260)}
.chip.active{background:oklch(18% 0.012 260);color:#fff;border-color:oklch(18% 0.012 260)}
.shop-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:1rem;margin-bottom:2rem}
.shop-card{
  background:#fff;border-radius:12px;border:1px solid oklch(92% 0.008 260);
  padding:1.5rem;transition:all 0.3s;position:relative;cursor:pointer
}
.shop-card:hover{border-color:oklch(55% 0.18 255 / 0.3);transform:translateY(-2px);box-shadow:0 8px 24px oklch(0% 0 0 / 0.05)}
.shop-card-cat{
  font-size:0.6875rem;font-weight:700;padding:0.1875rem 0.5rem;border-radius:4px;
  display:inline-block;margin-bottom:0.75rem;font-family:'JetBrains Mono','Manrope',monospace
}
.shop-card-cat.k12{background:oklch(55% 0.18 255 / 0.1);color:oklch(45% 0.15 255)}
.shop-card-cat.univ{background:oklch(50% 0.15 180 / 0.1);color:oklch(40% 0.14 180)}
.shop-card-cat.adult{background:oklch(65% 0.18 55 / 0.12);color:oklch(50% 0.16 50)}
.shop-card-cat.competition{background:oklch(50% 0.12 300 / 0.1);color:oklch(40% 0.12 300)}
.shop-card-cat.ebook{background:oklch(70% 0.15 80 / 0.1);color:oklch(45% 0.15 80)}
.shop-card h3{font-size:1.0625rem;margin-bottom:0.375rem}
.shop-card .desc{font-size:0.8125rem;color:oklch(50% 0.01 260);line-height:1.6;margin-bottom:1rem}
.shop-card-meta{display:flex;gap:1rem;margin-bottom:1rem;flex-wrap:wrap}
.shop-card-meta span{font-size:0.75rem;color:oklch(55% 0.01 260);background:oklch(96% 0.005 260);padding:0.25rem 0.625rem;border-radius:4px}
.shop-card-bottom{display:flex;align-items:center;justify-content:space-between;padding-top:0.75rem;border-top:1px solid oklch(94% 0.008 260)}
.shop-card-link{font-size:0.875rem;font-weight:600;color:oklch(55% 0.18 255);cursor:pointer}
.shop-card-price{font-family:'JetBrains Mono','Manrope',monospace;font-size:1.125rem;font-weight:700;color:oklch(18% 0.012 260)}
.shop-card-price small{font-size:0.6875rem;font-weight:400;color:oklch(55% 0.01 260)}
.btn-cart{background:oklch(55% 0.18 255);color:#fff;border:none;padding:0.5rem 1rem;border-radius:6px;font-size:0.8125rem;font-weight:600;cursor:pointer;transition:all 0.2s}
.btn-cart:hover{background:oklch(45% 0.15 255);transform:translateY(-1px)}
.btn-cart.in-cart{background:oklch(92% 0.008 260);color:oklch(50% 0.01 260)}
/* Cart Sidebar */
.cart-overlay{display:none;position:fixed;inset:0;background:oklch(0% 0 0 / 0.3);z-index:200}
.cart-sidebar{position:fixed;top:0;right:0;bottom:0;width:400px;max-width:90vw;
  background:#fff;z-index:201;display:flex;flex-direction:column;
  transform:translateX(100%);transition:transform 0.3s cubic-bezier(0.16,1,0.3,1);
  box-shadow:-8px 0 32px oklch(0% 0 0 / 0.08)}
.cart-sidebar.open{transform:translateX(0)}
.cart-header{display:flex;align-items:center;justify-content:space-between;padding:1.25rem;border-bottom:1px solid oklch(92% 0.008 260)}
.cart-header h3{font-size:1.125rem}
.cart-close{background:none;border:none;font-size:1.5rem;cursor:pointer;color:oklch(55% 0.01 260);line-height:1}
.cart-items{flex:1;overflow-y:auto;padding:0.75rem 1.25rem}
.cart-empty{text-align:center;padding:3rem 0;color:oklch(55% 0.01 260);font-size:0.875rem}
.cart-item{display:flex;align-items:center;justify-content:space-between;padding:0.75rem 0;border-bottom:1px solid oklch(96% 0.005 260)}
.cart-item-info{flex:1}
.cart-item-name{font-size:0.875rem;font-weight:600}
.cart-item-meta{font-size:0.75rem;color:oklch(55% 0.01 260);margin-top:0.125rem}
.cart-item-price{font-family:'JetBrains Mono','Manrope',monospace;font-size:0.875rem;font-weight:700}
.cart-item-remove{background:none;border:none;color:oklch(70% 0.01 260);cursor:pointer;font-size:0.75rem;margin-left:0.75rem}
.cart-item-remove:hover{color:oklch(55% 0.015 260)}
.cart-footer{padding:1.25rem;border-top:1px solid oklch(92% 0.008 260)}
.cart-total{display:flex;justify-content:space-between;font-size:1rem;font-weight:700;margin-bottom:1rem}
.cart-total-price{font-family:'JetBrains Mono','Manrope',monospace}
.btn-checkout{width:100%;padding:0.75rem;border-radius:8px;border:none;background:oklch(55% 0.18 255);color:#fff;font-size:0.9375rem;font-weight:700;cursor:pointer;transition:all 0.2s}
.btn-checkout:hover{background:oklch(45% 0.15 255)}
/* Cart float icon */
.cart-float{
  position:fixed;bottom:24px;right:24px;z-index:150;
  width:56px;height:56px;border-radius:50%;
  background:oklch(55% 0.18 255);color:#fff;
  display:flex;align-items:center;justify-content:center;
  cursor:pointer;box-shadow:0 4px 16px oklch(55% 0.18 255 / 0.3);
  transition:transform 0.2s;border:none;font-size:1.25rem
}
.cart-float:hover{transform:scale(1.05)}
.cart-badge{
  position:absolute;top:-4px;right:-4px;
  width:20px;height:20px;border-radius:50%;
  background:oklch(60% 0.22 25);color:#fff;
  font-size:0.6875rem;font-weight:700;
  display:flex;align-items:center;justify-content:center
}
/* Checkout Modal */
.checkout-modal{display:none;position:fixed;inset:0;z-index:300;
  background:oklch(0% 0 0 / 0.4);align-items:center;justify-content:center}
.checkout-modal.open{display:flex}
.checkout-box{background:#fff;border-radius:16px;padding:2.5rem;width:500px;max-width:92vw;
  max-height:90vh;overflow-y:auto}
.checkout-box h2{font-size:1.5rem;margin-bottom:0.5rem;text-align:center}
.checkout-box .sub{text-align:center;font-size:0.875rem;color:oklch(55% 0.01 260);margin-bottom:1.5rem}
.checkout-products{margin-bottom:1.5rem}
.checkout-product{display:flex;justify-content:space-between;padding:0.5rem 0;font-size:0.875rem}
.checkout-total-row{display:flex;justify-content:space-between;padding:1rem 0;border-top:2px solid oklch(88% 0.01 260);font-size:1rem;font-weight:700}
.payment-area{margin:1.5rem 0;text-align:center}
.payment-area .qrcode-placeholder{width:180px;height:180px;margin:0 auto;background:oklch(96% 0.005 260);border-radius:12px;display:flex;align-items:center;justify-content:center;border:2px dashed oklch(88% 0.01 260);font-size:0.8125rem;color:oklch(55% 0.01 260)}
.payment-area .pay-hint{font-size:0.8125rem;color:oklch(55% 0.01 260);margin-top:0.75rem}
.payment-area .pay-amount{font-family:'JetBrains Mono','Manrope',monospace;font-size:1.5rem;font-weight:700;color:oklch(18% 0.012 260);margin:0.75rem 0;text-align:center}
.checkout-actions{display:flex;gap:0.75rem}
.checkout-actions button{flex:1;padding:0.75rem;border-radius:8px;border:none;font-size:0.875rem;font-weight:600;cursor:pointer}
.btn-pay{background:oklch(55% 0.18 255);color:#fff}
.btn-pay:hover{background:oklch(45% 0.15 255)}
.btn-cancel{background:oklch(92% 0.008 260);color:oklch(18% 0.012 260)}
/* After payment - download links */
.download-area{display:none;margin:1rem 0;padding:1rem;background:oklch(96% 0.005 260);border-radius:8px}
.download-area.show{display:block}
.download-item{padding:0.75rem;background:#fff;border-radius:6px;margin-bottom:0.5rem;border:1px solid oklch(92% 0.008 260)}
.download-item:last-child{margin-bottom:0}
.download-item h4{font-size:0.875rem;margin-bottom:0.25rem}
.download-item a{color:oklch(55% 0.18 255);font-size:0.8125rem;word-break:break-all}
.download-item .pwd{font-size:0.75rem;color:oklch(55% 0.01 260);margin-top:0.125rem}
.download-item .pwd code{font-family:'JetBrains Mono','Manrope',monospace;background:oklch(92% 0.008 260);padding:0.125rem 0.375rem;border-radius:3px}

/* ===== Product Modal & Motion ===== */

.modal-overlay{display:none;position:fixed;inset:0;background:oklch(0% 0 0 / 0.4);z-index:300}
.modal-box{display:none;position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);z-index:301;background:#fff;border-radius:16px;padding:2rem;width:640px;max-width:92vw;max-height:88vh;overflow-y:auto;box-shadow:0 16px 48px oklch(0% 0 0 / 0.15)}
.modal-box.open{display:block}
.modal-close{position:absolute;top:1rem;right:1rem;font-size:1.5rem;background:none;border:none;cursor:pointer;color:oklch(55% 0.01 260);line-height:1;z-index:1}
.advanced-card{border-color:oklch(55% 0.18 255 / 0.2);background:linear-gradient(135deg, oklch(55% 0.18 255 / 0.02), #fff 60%)}
.advanced-card:hover{border-color:oklch(55% 0.18 255 / 0.4)!important}

/* ===== JS-managed interactions ===== */
.modal-overlay.open{display:block}
[data-reveal]{opacity:0;transform:translateY(24px);transition:opacity 0.6s cubic-bezier(0.25,1,0.5,1), transform 0.6s cubic-bezier(0.25,1,0.5,1)}
.revealed{opacity:1!important;transform:translateY(0)!important}
@keyframes ripple{to{transform:scale(4);opacity:0}}

/* ICP 备案链接样式 */
.footer-bottom a{color:oklch(60% 0.008 260);text-decoration:none}.footer-bottom a:hover{text-decoration:underline}