/* === RESET === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;text-size-adjust:100%;-webkit-text-size-adjust:100%}
body{min-height:100vh;background:var(--color-bg-white);color:var(--color-text-dark);font-family:var(--font-body);font-size:var(--fs-body);line-height:var(--lh-body);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
button{cursor:pointer;font:inherit;border:none;background:none;color:inherit}
ul,ol{list-style:none}
:focus-visible{outline:2px solid var(--color-gold);outline-offset:2px;border-radius:2px}
::selection{background:var(--color-deep-green);color:var(--color-white)}

/* === CSS VARIABLES === */
:root{
  --color-deep-green:#1B5E20;
  --color-gold:#FFD700;
  --color-bg-white:#FFFFFF;
  --color-dark-red:#8B0000;
  --color-text-black:#000000;
  --color-text-dark:#333333;
  --color-surface-light:#F5F5F5;
  --color-glass:rgba(255,255,255,0.82);
  --color-chart-green:#2E7D32;
  --color-chart-gold:#FFC107;
  --color-white:#FFFFFF;
  --color-border:rgba(27,94,32,0.15);
  --color-border-gold:rgba(255,215,0,0.4);

  --font-headings:'Oswald','Arial Black','Impact','Heiti SC','Microsoft YaHei',sans-serif;
  --font-body:'Inter',-apple-system,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;

  --fs-body:16px;
  --lh-body:1.6;
  --fs-h1:clamp(32px,5vw,52px);
  --fs-h2:clamp(24px,3.5vw,40px);
  --fs-h3:clamp(20px,2.5vw,32px);
  --fs-small:14px;
  --fs-tiny:12px;
  --fs-metric:clamp(36px,6vw,64px);

  --nav-width:240px;
  --nav-width-mobile:0px;
  --header-h-mobile:64px;
  --spacing-xs:8px;
  --spacing-sm:16px;
  --spacing-md:24px;
  --spacing-lg:40px;
  --spacing-xl:64px;
  --radius-sm:4px;
  --radius-md:8px;
  --radius-lg:16px;
  --shadow-card:0 2px 12px rgba(0,0,0,0.06);
  --shadow-hover:0 8px 28px rgba(0,0,0,0.10);
  --transition-fast:180ms ease;
  --transition-med:300ms ease;
  --z-skip:2000;
  --z-progress:1500;
  --z-nav:1200;
  --z-overlay:1100;
}

/* === TYPOGRAPHY === */
h1,h2,h3,h4,h5,h6{font-family:var(--font-headings);font-weight:700;line-height:1.15;color:var(--color-text-black)}
h1{font-size:var(--fs-h1);letter-spacing:-0.02em}
h2{font-size:var(--fs-h2);letter-spacing:-0.01em}
h3{font-size:var(--fs-h3)}
p{margin-bottom:1em}
small,.text-small{font-size:var(--fs-small)}
.text-tiny{font-size:var(--fs-tiny)}
.text-gold{color:var(--color-gold)}
.text-green{color:var(--color-deep-green)}
.text-red{color:var(--color-dark-red)}
.text-muted{color:var(--color-text-dark);opacity:0.7}
.font-heading{font-family:var(--font-headings)}
.font-body{font-family:var(--font-body)}

/* === SKIP LINK === */
.skip-link{position:fixed;top:-100px;left:var(--spacing-sm);z-index:var(--z-skip);padding:var(--spacing-xs) var(--spacing-sm);background:var(--color-deep-green);color:var(--color-white);font-size:var(--fs-small);border-radius:var(--radius-sm);transition:top var(--transition-fast)}
.skip-link:focus{top:var(--spacing-xs)}

/* === SCROLL PROGRESS === */
.scroll-progress{position:fixed;top:0;left:0;height:3px;background:linear-gradient(90deg,var(--color-deep-green),var(--color-gold));z-index:var(--z-progress);width:0%;transition:width 120ms ease-out;pointer-events:none}
@media(prefers-reduced-motion:reduce){.scroll-progress{display:none}}

/* === FRAME NAV === */
.frame-nav{position:fixed;top:0;left:0;width:var(--nav-width);height:100vh;background:var(--color-deep-green);color:var(--color-white);display:flex;flex-direction:column;z-index:var(--z-nav);overflow-y:auto;border-right:2px solid var(--color-border-gold);transition:transform var(--transition-med)}
.nav-brand{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-md) var(--spacing-sm);border-bottom:1px solid rgba(255,255,255,0.10)}
.nav-logo{font-family:var(--font-headings);font-size:22px;font-weight:700;color:var(--color-gold);letter-spacing:0.04em;line-height:1.2}
.nav-logo:hover{color:var(--color-white)}
.nav-toggle{display:none;flex-direction:column;gap:5px;padding:8px;border-radius:var(--radius-sm);transition:background var(--transition-fast)}
.nav-toggle:hover{background:rgba(255,255,255,0.08)}
.nav-toggle-bar{display:block;width:24px;height:2px;background:var(--color-white);border-radius:2px;transition:transform var(--transition-med),opacity var(--transition-med)}
.nav-list{flex:1;padding:var(--spacing-sm) 0}
.nav-item{}
.nav-link{display:block;padding:12px var(--spacing-md);font-family:var(--font-headings);font-size:18px;font-weight:500;color:rgba(255,255,255,0.80);letter-spacing:0.02em;border-left:3px solid transparent;transition:color var(--transition-fast),background var(--transition-fast),border-color var(--transition-fast)}
.nav-link:hover{color:var(--color-white);background:rgba(255,255,255,0.06)}
.nav-link[aria-current="page"]{color:var(--color-gold);border-left-color:var(--color-gold);background:rgba(255,215,0,0.08);font-weight:700}
.nav-annotation{padding:var(--spacing-md) var(--spacing-sm);writing-mode:vertical-rl;text-orientation:mixed;transform:rotate(180deg);font-size:var(--fs-tiny);color:rgba(255,255,255,0.50);letter-spacing:0.3em;text-align:center;border-top:1px solid rgba(255,255,255,0.06);min-height:90px;display:flex;align-items:center;justify-content:center;white-space:nowrap}

/* site-header wrapper */
.site-header{height:0;width:0;display:contents}

/* === MAIN CONTENT OFFSET === */
#main-content{margin-left:var(--nav-width);min-height:100vh;padding:0;background:var(--color-bg-white)}

/* === FOOTER === */
.site-footer{background:var(--color-deep-green);color:var(--color-white);padding:var(--spacing-xl) 0 var(--spacing-lg);margin-left:var(--nav-width)}
.footer-inner{max-width:1200px;margin:0 auto;padding:0 var(--spacing-md);display:grid;grid-template-columns:2fr 1fr 1.5fr;gap:var(--spacing-lg) var(--spacing-md);align-items:start}
.footer-brand{grid-column:1}
.footer-logo{font-family:var(--font-headings);font-size:26px;font-weight:700;color:var(--color-gold);letter-spacing:0.04em}
.footer-logo:hover{color:var(--color-white)}
.footer-tagline{margin-top:var(--spacing-xs);font-size:var(--fs-small);color:rgba(255,255,255,0.65);line-height:1.5}
.footer-nav{grid-column:2;display:flex;flex-direction:column;gap:var(--spacing-sm)}
.footer-link{font-size:var(--fs-small);color:rgba(255,255,255,0.80);transition:color var(--transition-fast);padding:2px 0}
.footer-link:hover{color:var(--color-gold)}
.footer-contact{grid-column:3;display:flex;flex-direction:column;gap:var(--spacing-xs);font-size:var(--fs-small);color:rgba(255,255,255,0.80)}
.footer-contact span{display:block}
.footer-legal{grid-column:1/-1;display:flex;justify-content:space-between;align-items:center;padding-top:var(--spacing-md);margin-top:var(--spacing-md);border-top:1px solid rgba(255,255,255,0.10);font-size:var(--fs-tiny);color:rgba(255,255,255,0.55);flex-wrap:wrap;gap:var(--spacing-xs)}
.footer-copyright{}
.footer-icp{}

/* === COMMON COMPONENTS === */
.container{max-width:1200px;margin:0 auto;padding:0 var(--spacing-md)}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:var(--spacing-xs);padding:12px 28px;font-family:var(--font-headings);font-size:16px;font-weight:600;border-radius:var(--radius-md);transition:all var(--transition-fast);line-height:1.2;text-align:center}
.btn-primary{background:var(--color-deep-green);color:var(--color-white);border:2px solid var(--color-deep-green)}
.btn-primary:hover{background:var(--color-gold);color:var(--color-text-black);border-color:var(--color-gold)}
.btn-outline{background:transparent;color:var(--color-deep-green);border:2px solid var(--color-deep-green)}
.btn-outline:hover{background:var(--color-deep-green);color:var(--color-white)}
.btn-small{padding:8px 18px;font-size:14px}

/* Breadcrumb */
.breadcrumb{display:flex;flex-wrap:wrap;gap:var(--spacing-xs);padding:var(--spacing-sm) 0;font-size:var(--fs-small);color:var(--color-text-dark);opacity:0.7}
.breadcrumb a:hover{color:var(--color-deep-green);opacity:1}
.breadcrumb span+span::before{content:"›";margin:0 6px;color:var(--color-gold);opacity:0.6}

/* Content body */
.content-body{max-width:720px;margin:0 auto;padding:var(--spacing-lg) 0}
.content-body p{color:var(--color-text-dark)}
.content-body h2,.content-body h3{margin-top:var(--spacing-lg);margin-bottom:var(--spacing-sm)}

/* Grid */
.grid{display:grid;grid-template-columns:repeat(12,1fr);gap:var(--spacing-md)}
.grid-2{grid-template-columns:1fr 1fr}
.grid-3{grid-template-columns:1fr 1fr 1fr}
@media(max-width:768px){.grid-2,.grid-3{grid-template-columns:1fr}}

/* Card */
.card{background:var(--color-bg-white);border-radius:var(--radius-md);padding:var(--spacing-md);box-shadow:var(--shadow-card);transition:transform var(--transition-med),box-shadow var(--transition-med);border:1px solid var(--color-border)}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.card-header{margin-bottom:var(--spacing-sm);font-family:var(--font-headings);font-size:var(--fs-h3);font-weight:600}
.card-body{color:var(--color-text-dark);font-size:var(--fs-small)}

/* Glass overlay */
.glass{background:var(--color-glass);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-radius:var(--radius-lg);border:1px solid rgba(255,255,255,0.3);padding:var(--spacing-md)}
@media(prefers-reduced-motion:reduce){.glass{backdrop-filter:none;-webkit-backdrop-filter:none}}

/* Metric */
.metric{text-align:center;padding:var(--spacing-sm)}
.metric-value{font-family:var(--font-headings);font-size:var(--fs-metric);font-weight:700;color:var(--color-gold);line-height:1;letter-spacing:-0.03em}
.metric-label{font-size:var(--fs-small);color:var(--color-text-dark);margin-top:var(--spacing-xs);opacity:0.8}

/* Section */
.section{padding:var(--spacing-xl) 0}
.section+.section{border-top:1px solid var(--color-border)}
.section-title{font-size:var(--fs-h2);margin-bottom:var(--spacing-md);position:relative;padding-bottom:var(--spacing-sm)}
.section-title::after{content:"";display:block;width:60px;height:3px;background:var(--color-gold);margin-top:var(--spacing-xs)}
.section-title-center{text-align:center}
.section-title-center::after{margin-left:auto;margin-right:auto}

/* Annotation (rotated) */
.annotation{display:inline-block;writing-mode:vertical-rl;text-orientation:mixed;transform:rotate(180deg);font-size:var(--fs-tiny);color:var(--color-dark-red);letter-spacing:0.15em;opacity:0.7;white-space:nowrap;line-height:1.4}

/* === RESPONSIVE === */
@media(max-width:1024px){
  :root{--nav-width:200px}
  .nav-link{font-size:16px;padding:10px var(--spacing-sm)}
}
@media(max-width:768px){
  :root{--nav-width:0px;--nav-width-mobile:0px}
  .frame-nav{position:fixed;top:0;left:0;width:100%;height:var(--header-h-mobile);flex-direction:row;flex-wrap:wrap;border-right:none;border-bottom:2px solid var(--color-border-gold);overflow:visible;align-content:flex-start}
  .nav-brand{width:100%;padding:0 var(--spacing-sm);height:var(--header-h-mobile);display:flex;border-bottom:none}
  .nav-toggle{display:flex}
  .nav-list{display:none;width:100%;flex:none;background:var(--color-deep-green);padding:var(--spacing-xs) 0 var(--spacing-sm);border-top:1px solid rgba(255,255,255,0.08)}
  .nav-list .nav-link{font-size:16px;padding:10px var(--spacing-md)}
  .frame-nav[data-open] .nav-list{display:block}
  .frame-nav[data-open]{height:auto}
  .frame-nav[data-open] .nav-toggle-bar:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
  .frame-nav[data-open] .nav-toggle-bar:nth-child(2){opacity:0}
  .frame-nav[data-open] .nav-toggle-bar:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}
  .nav-annotation{display:none}
  #main-content{margin-left:0;padding-top:var(--header-h-mobile)}
  .site-footer{margin-left:0}
  .footer-inner{grid-template-columns:1fr 1fr;gap:var(--spacing-md)}
  .footer-brand{grid-column:1/-1}
  .footer-nav{grid-column:1}
  .footer-contact{grid-column:2}
  .footer-legal{grid-column:1/-1;flex-direction:column;align-items:flex-start;gap:var(--spacing-xs)}
}
@media(max-width:480px){
  .footer-inner{grid-template-columns:1fr;gap:var(--spacing-sm)}
  .footer-nav,.footer-contact{grid-column:1}
  .section{padding:var(--spacing-lg) 0}
  .container{padding:0 var(--spacing-sm)}
}

/* === ACCESSIBILITY & REDUCED MOTION === */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{transition-duration:0ms!important;animation-duration:0ms!important}
  .card:hover{transform:none}
  html{scroll-behavior:auto}
  .scroll-progress{display:none}
}
@media(prefers-contrast:high){
  .frame-nav{border-right-width:3px}
  .nav-link[aria-current="page"]{outline:2px solid var(--color-gold);outline-offset:-2px}
  .btn-primary{border-width:3px}
}