/* ========== 1. Reset ========== */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{margin:0;}
img,svg,picture,video{max-width:100%;display:block;}
button{font:inherit;color:inherit;}
ul,ol{margin:0 0 1em;padding-left:1.15em;}
p{margin:0 0 1em;}
a{color:inherit;}
::selection{background:#F2D48A;color:#0E3B43;}

/* ========== 2. Tokens ========== */
:root{
  --peacock:#0E3B43;
  --peacock-deep:#0B3037;
  --peacock-mid:#1F5C63;
  --amber:#D89B2B;
  --amber-soft:#F2D48A;
  --garnet:#B23A48;
  --olive:#6E7B3A;
  --amethyst:#6B4C8A;
  --sand:#F6F1E8;
  --shell:#FFFDF8;
  --ink:#1C2321;
  --graphite:#5A6360;
  --rule:rgba(14,59,67,.16);
  --rule-strong:rgba(14,59,67,.34);
  --rule-light:rgba(242,212,138,.28);
  --shadow-sm:0 1px 0 rgba(28,35,33,.04),0 10px 26px -20px rgba(14,59,67,.7);
  --radius:6px;
  --radius-lg:10px;
  --maxw:1180px;
  --narrow:760px;
  --gutter:clamp(18px,4vw,48px);
  --serif:"Noto Serif SC","Songti SC","Source Han Serif SC","SimSun",serif;
  --sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --mono:"IBM Plex Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

/* ========== 3. Base typography ========== */
body{
  background:var(--sand);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16.5px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  font-family:var(--serif);
  font-weight:800;
  line-height:1.22;
  letter-spacing:-.01em;
  color:var(--ink);
  margin:0 0 .55em;
}
h1{font-size:clamp(36px,5vw,66px);font-weight:900;letter-spacing:-.015em;}
h2{font-size:clamp(26px,3.2vw,42px);}
h3{font-size:clamp(20px,2.2vw,26px);}
h4{font-size:clamp(17px,1.6vw,19px);}
#main-content{display:block;scroll-margin-block-start:24px;}
:focus-visible{outline:3px solid var(--amber);outline-offset:3px;border-radius:3px;}

/* ========== 4. Utilities ========== */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums;letter-spacing:.04em;}
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter);}
.container--narrow{max-width:var(--narrow);}
.section{padding-block:clamp(44px,6vw,84px);}
.section--tight{padding-block:clamp(26px,4vw,48px);}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:11.5px;font-weight:500;
  letter-spacing:.22em;text-transform:uppercase;
  color:var(--peacock-mid);margin:0 0 14px;
}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--amber);}
.lead{font-size:clamp(16px,1.6vw,18.5px);line-height:1.85;color:var(--graphite);}
.prose{max-width:68ch;}
.prose p+p{margin-top:.9em;}
.prose h3{margin-top:1.6em;}
.chapter-num{
  font-family:var(--mono);font-variant-numeric:tabular-nums;
  font-size:clamp(42px,7vw,88px);font-weight:500;line-height:.9;
  letter-spacing:-.03em;color:rgba(14,59,67,.16);margin:0 0 6px;
}

/* ========== 5. Skip link ========== */
.skip-link{
  position:absolute;left:12px;top:-120px;z-index:300;
  background:var(--amber);color:#241F0C;
  padding:11px 20px;border-radius:0 0 8px 8px;
  font-weight:700;font-size:14px;text-decoration:none;
  transition:top .22s ease;
}
.skip-link:focus{top:0;}

/* ========== 6. Header / masthead ========== */
.site-header{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  color:var(--sand);
  background:
    radial-gradient(150% 130% at 50% -50%,#1F5C63 0%,rgba(31,92,99,0) 64%),
    linear-gradient(180deg,#0E3B43 0%,#0B3037 100%);
  padding:clamp(28px,4.2vw,48px) 0 0;
  border-bottom:2px solid rgba(216,155,43,.85);
}
.site-header::before{
  content:"";
  position:absolute;inset:0 0 auto 0;height:9px;
  background-image:repeating-linear-gradient(90deg,rgba(242,212,138,.5) 0 1px,transparent 1px 16px);
  opacity:.62;pointer-events:none;z-index:0;
}
.scroll-progress{
  position:fixed;top:0;left:0;width:100%;height:3px;
  background:linear-gradient(90deg,var(--amber-soft),var(--amber));
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform .12s linear;
  z-index:200;pointer-events:none;
}

.account-tab{
  position:absolute;
  top:clamp(14px,2vw,22px);right:clamp(14px,2vw,30px);
  z-index:5;
  display:inline-flex;align-items:center;gap:8px;
  padding:9px 16px 9px 14px;
  background:var(--amber);color:#241F0C;
  border-radius:999px;
  font-size:12.5px;font-weight:700;letter-spacing:.1em;
  text-decoration:none;
  box-shadow:0 10px 26px -16px rgba(0,0,0,.9);
  transition:transform .2s ease,background-color .2s ease;
}
.account-tab:hover{background:var(--amber-soft);transform:translateY(-2px);}
.account-tab__dot{
  width:7px;height:7px;border-radius:50%;background:var(--garnet);
  box-shadow:0 0 0 3px rgba(178,58,72,.24);flex:none;
}

.masthead{
  position:relative;z-index:2;
  max-width:var(--maxw);margin-inline:auto;
  padding:0 var(--gutter);
  text-align:center;
}
.masthead__brand-line{
  margin:0;
  font-family:var(--mono);font-size:11.5px;font-weight:500;
  letter-spacing:.34em;text-indent:.34em;
  color:rgba(242,212,138,.86);
}
.masthead__logo{
  display:inline-flex;flex-direction:column;align-items:center;gap:9px;
  margin:clamp(12px,1.8vw,20px) 0 clamp(10px,1.4vw,14px);
  text-decoration:none;color:var(--shell);
}
.masthead__gem{
  width:9px;height:9px;background:var(--amber);
  transform:rotate(45deg);
  outline:1px solid rgba(242,212,138,.45);outline-offset:4px;
}
.masthead__wordmark{
  font-family:var(--serif);font-weight:900;
  font-size:clamp(36px,6.4vw,62px);
  line-height:1.02;letter-spacing:.08em;text-indent:.08em;
  color:var(--shell);
  transition:color .22s ease;
}
.masthead__logo:hover .masthead__wordmark{color:var(--amber-soft);}
.masthead__sub{
  margin:0 0 8px;
  font-size:13px;letter-spacing:.2em;text-indent:.2em;
  color:rgba(246,241,232,.72);
}
.masthead__meta{
  margin:0;
  font-size:11px;letter-spacing:.2em;
  color:rgba(246,241,232,.46);
}

/* ========== 7. Navigation ========== */
.nav-bar{
  position:relative;z-index:2;
  margin-top:clamp(16px,2.4vw,26px);
  border-top:1px solid var(--rule-light);
  background:rgba(8,38,44,.5);
}
.nav-bar__inner{
  max-width:var(--maxw);margin-inline:auto;
  padding:0 var(--gutter);
  min-height:54px;
  display:flex;align-items:center;justify-content:center;
}
.primary-nav__list{
  list-style:none;margin:0;padding:0;
  display:flex;flex-wrap:wrap;justify-content:center;align-items:center;
  gap:2px;
}
.primary-nav__item{margin:0;}
.primary-nav__link{
  position:relative;
  display:inline-flex;align-items:baseline;gap:7px;
  padding:13px 15px;
  border-radius:4px;
  color:rgba(246,241,232,.76);
  font-size:14.5px;font-weight:500;letter-spacing:.07em;
  text-decoration:none;
  transition:color .2s ease,background-color .2s ease;
}
.primary-nav__link:hover{color:var(--shell);background:rgba(242,212,138,.1);}
.primary-nav__num{
  font-size:10.5px;font-weight:400;
  color:rgba(242,212,138,.55);
  transition:color .2s ease;
}
.primary-nav__link:hover .primary-nav__num{color:var(--amber);}
.primary-nav__link[aria-current="page"]{
  color:var(--amber-soft);
  background:rgba(242,212,138,.12);
}
.primary-nav__link[aria-current="page"] .primary-nav__num{color:var(--amber);}
.primary-nav__link[aria-current="page"]::after{
  content:"";position:absolute;left:15px;right:15px;bottom:6px;
  height:2px;background:var(--amber);border-radius:1px;
}

.nav-toggle{
  display:none;
  align-items:center;gap:11px;
  align-self:flex-start;
  padding:10px 16px;
  background:rgba(242,212,138,.1);
  border:1px solid rgba(242,212,138,.34);
  border-radius:999px;
  color:var(--amber-soft);
  font-size:12.5px;font-weight:600;letter-spacing:.16em;
  cursor:pointer;
  transition:background-color .2s ease;
}
.nav-toggle:hover{background:rgba(242,212,138,.18);}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:3.5px;width:16px;flex:none;}
.nav-toggle__bars span{
  display:block;height:1.5px;width:100%;
  background:currentColor;border-radius:1px;
  transition:transform .22s ease,opacity .18s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg);}

/* ========== 8. Buttons ========== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:12px 24px;
  border:1px solid transparent;border-radius:999px;
  font-family:var(--sans);font-size:14.5px;font-weight:600;letter-spacing:.05em;
  text-decoration:none;cursor:pointer;
  transition:transform .18s ease,background-color .2s ease,color .2s ease,border-color .2s ease;
}
.btn:hover{transform:translateY(-2px);}
.btn--amber{background:var(--amber);color:#241F0C;}
.btn--amber:hover{background:var(--amber-soft);}
.btn--solid{background:var(--peacock);color:var(--sand);}
.btn--solid:hover{background:var(--peacock-mid);}
.btn--ghost{background:transparent;color:var(--peacock);border-color:var(--rule-strong);}
.btn--ghost:hover{border-color:var(--peacock);background:rgba(31,92,99,.07);}
.btn--on-dark{background:rgba(242,212,138,.08);color:var(--amber-soft);border-color:rgba(242,212,138,.45);}
.btn--on-dark:hover{background:rgba(242,212,138,.16);}

/* ========== 9. Breadcrumb ========== */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;
  color:var(--graphite);margin:0 0 22px;
}
.breadcrumb a{color:var(--peacock-mid);text-decoration:none;}
.breadcrumb a:hover{text-decoration:underline;}
.breadcrumb__sep{color:rgba(90,99,96,.5);}

/* ========== 10. Layout blocks ========== */
.grid-bento{
  display:grid;gap:clamp(14px,2vw,22px);
  grid-template-columns:repeat(12,minmax(0,1fr));
}
.panel{
  background:var(--shell);
  border:1px solid var(--rule);
  border-radius:var(--radius);
  box-shadow:var(--shadow-sm);
  padding:clamp(18px,2.6vw,32px);
  min-width:0;
}
.panel--tint{background:rgba(31,92,99,.06);border-color:rgba(31,92,99,.18);}
.panel--dark{
  background:var(--peacock);color:var(--sand);
  border-color:rgba(242,212,138,.26);
}
.panel--dark h2,.panel--dark h3{color:var(--shell);}

.frame{
  position:relative;
  background:var(--shell);
  border:1px solid var(--rule-strong);
  border-radius:var(--radius-lg);
  padding:clamp(20px,3.2vw,44px);
}
.frame--ruler::before{
  content:"";
  position:absolute;left:-1px;right:-1px;top:-9px;height:8px;
  background-image:repeating-linear-gradient(90deg,var(--rule-strong) 0 1px,transparent 1px 12px);
  opacity:.75;
  pointer-events:none;
}

/* ========== 11. Media containers ========== */
.media{
  position:relative;overflow:hidden;
  border-radius:var(--radius);
  border:1px solid var(--rule);
  background:
    radial-gradient(120% 100% at 20% 0%,rgba(31,92,99,.18),transparent 60%),
    linear-gradient(140deg,rgba(216,155,43,.16),rgba(107,76,138,.12));
}
.media img{width:100%;height:100%;object-fit:cover;display:block;}
.media--wide{aspect-ratio:16/9;}
.media--tall{aspect-ratio:3/4;}
.media--square{aspect-ratio:1/1;}
.media--crop{aspect-ratio:21/9;}
.media__caption{
  margin:8px 0 0;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.06em;
  color:var(--graphite);
}

/* ========== 12. Footer ========== */
.site-footer{
  margin-top:clamp(40px,6vw,80px);
  color:rgba(246,241,232,.84);
  background:
    radial-gradient(120% 90% at 10% -10%,rgba(107,76,138,.32),transparent 60%),
    radial-gradient(105% 85% at 94% 0%,rgba(216,155,43,.2),transparent 64%),
    linear-gradient(180deg,#0E3B43 0%,#0A2C32 100%);
  border-top:3px solid var(--amber);
  padding-top:clamp(38px,5vw,62px);
}
.footer__inner{
  max-width:var(--maxw);margin-inline:auto;
  padding:0 var(--gutter) clamp(30px,4vw,48px);
  display:grid;
  grid-template-columns:1.55fr 1fr 1.15fr;
  gap:clamp(26px,4vw,56px);
}
.footer__brand{min-width:0;}
.footer__wordmark{
  font-family:var(--serif);font-weight:900;
  font-size:clamp(24px,2.6vw,30px);
  letter-spacing:.1em;color:var(--shell);margin:0 0 10px;
}
.footer__wordmark::after{
  content:"";display:block;width:38px;height:2px;
  background:var(--amber);margin-top:12px;
}
.footer__note{
  margin:0 0 10px;font-size:14px;line-height:1.7;
  color:rgba(246,241,232,.76);max-width:32ch;
}
.footer__meta{
  margin:0 0 20px;font-size:11px;letter-spacing:.14em;
  color:rgba(246,241,232,.44);
}
.footer__cta{font-size:13.5px;padding:11px 20px;}
.footer__col{min-width:0;}
.footer__heading{
  font-family:var(--mono);font-size:11px;font-weight:500;
  letter-spacing:.24em;color:var(--amber-soft);
  margin:0 0 14px;
}
.footer__list{list-style:none;margin:0;padding:0;}
.footer__list li{margin:0 0 2px;}
.footer__list a{
  display:inline-block;padding:4px 0;
  font-size:14.5px;color:rgba(246,241,232,.78);
  text-decoration:none;
  transition:color .2s ease;
}
.footer__list a:hover{color:var(--amber-soft);}
.footer__list--plain li{
  font-size:13.5px;line-height:1.7;
  color:rgba(246,241,232,.7);
  padding:5px 0;
  border-bottom:1px dashed rgba(246,241,232,.12);
}
.footer__list--plain li:last-child{border-bottom:0;}
.footer__k{
  display:block;font-size:10.5px;letter-spacing:.2em;
  color:rgba(242,212,138,.6);margin-bottom:2px;
}
.footer__bottom{
  max-width:var(--maxw);margin-inline:auto;
  padding:16px var(--gutter) 26px;
  border-top:1px solid rgba(246,241,232,.14);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 24px;
  font-size:12.5px;color:rgba(246,241,232,.56);
}
.footer__legal-links{display:inline-flex;flex-wrap:wrap;align-items:center;gap:8px;}
.footer__legal-links a{color:rgba(246,241,232,.72);text-decoration:none;}
.footer__legal-links a:hover{color:var(--amber-soft);text-decoration:underline;}
.footer__sep{color:rgba(246,241,232,.32);}
.footer__icp{font-size:11.5px;letter-spacing:.08em;color:rgba(246,241,232,.5);}
.footer__copy{font-size:12px;color:rgba(246,241,232,.5);}

/* ========== 13. Reveal ========== */
[data-reveal]{opacity:1;transform:none;}
html.js [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .65s cubic-bezier(.22,.7,.3,1),transform .65s cubic-bezier(.22,.7,.3,1);
  transition-delay:var(--reveal-delay,0ms);
}
html.js [data-reveal].is-visible{opacity:1;transform:none;}

/* ========== 14. Responsive ========== */
@media (max-width:1024px){
  .footer__inner{grid-template-columns:1fr 1fr;}
  .footer__brand{grid-column:1 / -1;}
}
@media (max-width:880px){
  .nav-toggle{display:inline-flex;}
  .nav-bar__inner{
    flex-direction:column;align-items:stretch;
    padding-top:10px;padding-bottom:12px;
    min-height:0;
  }
  .primary-nav{display:none;}
  .primary-nav[data-open]{display:block;}
  .primary-nav__list{
    flex-direction:column;align-items:stretch;gap:0;
    margin-top:12px;padding-top:8px;
    border-top:1px solid rgba(242,212,138,.18);
  }
  .primary-nav__link{
    width:100%;justify-content:flex-start;
    padding:14px 6px;border-radius:0;
    font-size:15.5px;
    border-bottom:1px dashed rgba(242,212,138,.14);
  }
  .primary-nav__link[aria-current="page"]{background:rgba(242,212,138,.1);}
  .primary-nav__link[aria-current="page"]::after{left:6px;right:auto;width:24px;bottom:8px;}
  .primary-nav__num{font-size:11px;}
}
@media (max-width:640px){
  body{font-size:16px;}
  .masthead__brand-line{font-size:10.5px;letter-spacing:.24em;text-indent:.24em;}
  .masthead__sub{font-size:11.5px;letter-spacing:.14em;text-indent:.14em;}
  .masthead__meta{font-size:10px;letter-spacing:.12em;}
  .account-tab{top:10px;right:10px;padding:7px 12px;font-size:11px;letter-spacing:.06em;}
  .footer__inner{grid-template-columns:1fr;}
  .footer__bottom{flex-direction:column;align-items:flex-start;}
  .btn{width:auto;}
}
@media (max-width:380px){
  .account-tab__dot{display:none;}
}

/* ========== 15. Reduced motion ========== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html.js [data-reveal]{opacity:1;transform:none;}
  .btn:hover,.account-tab:hover{transform:none;}
}