/* ===== Reset ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{min-height:100vh;line-height:1.6;font-family:'Inter','Roboto',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;font-weight:400;font-size:1rem;color:var(--color-neutral-dark);background:var(--color-neutral-light);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
button,input,textarea{font:inherit;color:inherit;border:none;background:none;cursor:pointer}
:focus-visible{outline:3px solid var(--color-primary);outline-offset:2px;border-radius:2px}
::selection{background:var(--color-primary);color:#fff}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:0.01ms!important;animation-iteration-count:1!important;transition-duration:0.01ms!important;scroll-behavior:auto!important}}

/* ===== CSS Variables ===== */
:root{
  --color-primary:#FF6B35;
  --color-secondary:#E63946;
  --color-accent:#1D3557;
  --color-neutral-dark:#0B1A2A;
  --color-neutral-light:#F1FAEE;
  --color-glass-bg:rgba(255,255,255,0.7);
  --color-data-highlight:#FFD166;
  --color-border:#A8DADC;
  --color-primary-hover:#e85d2a;
  --color-secondary-hover:#c92e3a;
  --color-accent-hover:#152a45;
  --font-heading:900 italic clamp(2rem,5vw,4rem)/1.1 'Inter','Roboto',-apple-system,sans-serif;
  --font-body:400 1rem/1.6 'Inter','Roboto',-apple-system,sans-serif;
  --font-data:700 2rem/1.2 'JetBrains Mono','Fira Code','Consolas',monospace;
  --header-height:72px;
  --max-width:1280px;
  --content-max:1200px;
  --gap:1.5rem;
  --radius:8px;
  --radius-lg:12px;
  --shadow-sm:0 2px 8px rgba(13,27,42,0.08);
  --shadow-md:0 4px 20px rgba(13,27,42,0.12);
  --shadow-lg:0 8px 40px rgba(13,27,42,0.18);
  --transition:0.3s cubic-bezier(0.4,0,0.2,1)
}

/* ===== Typography ===== */
h1,h2,h3,h4,h5,h6{font:var(--font-heading);color:var(--color-neutral-dark);margin-bottom:0.5em}
h1{font-size:clamp(2.2rem,5.5vw,4rem)}
h2{font-size:clamp(1.8rem,4vw,3rem)}
h3{font-size:clamp(1.4rem,3vw,2.2rem)}
h4{font-size:clamp(1.1rem,2vw,1.6rem)}
p,li{font:var(--font-body);color:var(--color-neutral-dark);margin-bottom:0.75em}
small{font-size:0.875rem;color:var(--color-accent)}
strong{font-weight:700}
.data-num{font:var(--font-data);color:var(--color-data-highlight);display:inline-block}

/* ===== Skip Link ===== */
.skip-link{position:absolute;top:-100%;left:1rem;padding:0.75rem 1.5rem;background:var(--color-primary);color:#fff;font-weight:700;border-radius:var(--radius);z-index:10000;transition:top 0.25s}
.skip-link:focus{top:1rem}

/* ===== Reading Progress ===== */
.reading-progress{position:fixed;top:0;left:0;width:0%;height:4px;background:linear-gradient(90deg,var(--color-primary),var(--color-secondary));z-index:9999;border-radius:0 2px 2px 0;transition:width 0.1s linear;pointer-events:none}
@media(prefers-reduced-motion:reduce){.reading-progress{transition:none}}

/* ===== Header ===== */
.site-header{position:sticky;top:0;z-index:1000;background:var(--color-accent);color:#fff;box-shadow:var(--shadow-md);border-bottom:3px solid var(--color-secondary)}
.header-inner{display:flex;align-items:center;justify-content:space-between;max-width:var(--max-width);margin:0 auto;padding:0 1.5rem;height:var(--header-height);position:relative}
.header-brand{display:flex;align-items:center;gap:0.5rem;flex-shrink:0}
.brand-link{font:var(--font-heading);font-size:clamp(1.2rem,2.5vw,1.8rem);color:var(--color-primary);letter-spacing:-0.02em;display:flex;align-items:center;gap:0.6rem;transition:color var(--transition)}
.brand-link:hover,.brand-link:focus-visible{color:var(--color-data-highlight)}
.brand-icon{display:inline-block;width:28px;height:28px;background:var(--color-secondary);clip-path:polygon(50% 0%,100% 25%,100% 75%,50% 100%,0% 75%,0% 25%);transform:rotate(15deg);transition:transform var(--transition)}
.brand-link:hover .brand-icon{transform:rotate(45deg)}
.header-nav{display:flex;align-items:center}
.nav-list{display:flex;gap:0.25rem;align-items:center}
.nav-item{margin:0}
.nav-link{display:inline-block;padding:0.5rem 1rem;font-weight:600;font-size:0.95rem;color:rgba(255,255,255,0.85);border-radius:var(--radius);transition:all var(--transition);position:relative;white-space:nowrap}
.nav-link:hover,.nav-link:focus-visible{color:#fff;background:rgba(255,255,255,0.12)}
.nav-link[aria-current="page"]{color:#fff;background:var(--color-secondary);box-shadow:0 2px 12px rgba(230,57,70,0.3)}
.nav-link[aria-current="page"]::after{display:none}
.header-status{flex-shrink:0;margin-left:1rem}
.data-update-badge{display:inline-block;padding:0.3rem 0.9rem;font-size:0.8rem;font-weight:700;color:#fff;background:rgba(255,107,53,0.25);border:1px solid var(--color-primary);border-radius:20px;letter-spacing:0.02em;white-space:nowrap;transition:background var(--transition)}
.data-update-badge:hover{background:rgba(255,107,53,0.4)}

/* ===== Nav Toggle (Mobile) ===== */
.nav-toggle{display:none;flex-direction:column;justify-content:center;align-items:center;width:44px;height:44px;gap:5px;padding:8px;border-radius:var(--radius);transition:background var(--transition);z-index:1001;cursor:pointer}
.nav-toggle:hover,.nav-toggle:focus-visible{background:rgba(255,255,255,0.1)}
.nav-toggle-line{display:block;width:24px;height:3px;background:#fff;border-radius:2px;transition:all var(--transition);transform-origin:center}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1){transform:translateY(8px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2){opacity:0;transform:scaleX(0)}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3){transform:translateY(-8px) rotate(-45deg)}

/* ===== Footer ===== */
.site-footer{background:var(--color-accent);color:rgba(255,255,255,0.85);padding:2.5rem 0 2rem;position:relative;border-top:4px solid var(--color-primary)}
.footer-decor{position:absolute;top:-4px;left:0;width:100%;height:4px;background:linear-gradient(90deg,var(--color-primary),var(--color-secondary),var(--color-data-highlight))}
.footer-inner{display:grid;grid-template-columns:2fr 1.8fr 1fr;gap:2rem;max-width:var(--max-width);margin:0 auto;padding:0 1.5rem}
.footer-brand-link{font:var(--font-heading);font-size:clamp(1.2rem,2vw,1.6rem);color:var(--color-primary);display:inline-block;margin-bottom:0.75rem;transition:color var(--transition)}
.footer-brand-link:hover,.footer-brand-link:focus-visible{color:var(--color-data-highlight)}
.footer-trust{font-size:0.9rem;line-height:1.5;color:rgba(255,255,255,0.65);max-width:32ch}
.footer-info p{margin-bottom:0.4rem;font-size:0.92rem;color:rgba(255,255,255,0.75)}
.footer-copyright{font-weight:600;color:#fff}
.footer-contact{word-break:break-all}
.footer-nav-list{display:flex;flex-direction:column;gap:0.4rem}
.footer-nav-list a{font-size:0.92rem;color:rgba(255,255,255,0.75);padding:0.2rem 0;border-bottom:1px solid transparent;transition:all var(--transition);display:inline-block}
.footer-nav-list a:hover,.footer-nav-list a:focus-visible{color:var(--color-primary);border-bottom-color:var(--color-primary)}
.footer-nav-list a:first-child{font-weight:600;color:#fff}

/* ===== Buttons ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;padding:0.6rem 1.5rem;font-weight:700;font-size:0.95rem;border-radius:var(--radius);transition:all var(--transition);cursor:pointer;text-align:center;gap:0.5rem;border:2px solid transparent;min-height:44px}
.btn-primary{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}
.btn-primary:hover,.btn-primary:focus-visible{background:var(--color-primary-hover);border-color:var(--color-primary-hover);box-shadow:0 4px 16px rgba(255,107,53,0.3)}
.btn-outline{background:transparent;color:var(--color-primary);border-color:var(--color-primary)}
.btn-outline:hover,.btn-outline:focus-visible{background:var(--color-primary);color:#fff}
.btn-sm{padding:0.4rem 1rem;font-size:0.85rem;min-height:36px}
.btn-lg{padding:0.8rem 2rem;font-size:1.1rem}

/* ===== Breadcrumb ===== */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:0.4rem;padding:0.8rem 0;font-size:0.9rem;color:var(--color-accent)}
.breadcrumb a{color:var(--color-accent);transition:color var(--transition);border-bottom:1px solid transparent}
.breadcrumb a:hover{color:var(--color-primary);border-bottom-color:var(--color-primary)}
.breadcrumb .sep{color:var(--color-border);margin:0 0.2rem}
.breadcrumb [aria-current="page"]{font-weight:700;color:var(--color-neutral-dark)}

/* ===== Container & Layout ===== */
.container{max-width:var(--content-max);margin:0 auto;padding:0 1.5rem;width:100%}
.site-main{min-height:60vh;padding:2rem 0}
.section{padding:3rem 0}
.section-sm{padding:1.5rem 0}

/* ===== Grid ===== */
.grid{display:grid;gap:var(--gap)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.gap-sm{gap:1rem}
.gap-lg{gap:2.5rem}

/* ===== Data Card ===== */
.data-card{background:var(--color-glass-bg);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-radius:var(--radius-lg);padding:1.5rem;border:1px solid var(--color-border);box-shadow:var(--shadow-sm);transition:all var(--transition);position:relative;overflow:hidden}
.data-card::before{content:'';position:absolute;top:0;left:0;width:4px;height:100%;background:var(--color-primary);border-radius:0 2px 2px 0;opacity:0;transition:opacity var(--transition)}
.data-card:hover{transform:translateY(-4px) scale(1.01);box-shadow:var(--shadow-lg)}
.data-card:hover::before{opacity:1}
.data-card-title{font-size:1.2rem;font-weight:800;margin-bottom:0.5rem;color:var(--color-neutral-dark)}
.data-card-value{font:var(--font-data);color:var(--color-data-highlight);display:block;margin-bottom:0.3rem}
.data-card-label{font-size:0.85rem;color:var(--color-accent);font-weight:600;text-transform:uppercase;letter-spacing:0.04em}

/* ===== Archive Folder ===== */
.archive-folder{background:#fff;border-radius:var(--radius-lg);padding:1.8rem;border:2px solid var(--color-accent);box-shadow:var(--shadow-md);position:relative}
.archive-folder::after{content:'';position:absolute;top:-8px;right:24px;width:40px;height:16px;background:var(--color-secondary);border-radius:0 0 6px 6px}
.archive-folder-title{font-size:1.3rem;font-weight:900;color:var(--color-accent);margin-bottom:1rem;padding-bottom:0.6rem;border-bottom:2px solid var(--color-border)}

/* ===== Category Tag ===== */
.category-tag{display:inline-block;padding:0.25rem 0.8rem;font-size:0.8rem;font-weight:700;background:var(--color-secondary);color:#fff;border-radius:20px;letter-spacing:0.02em;transition:all var(--transition)}
.category-tag:hover{background:var(--color-secondary-hover);transform:scale(1.04)}
.category-tag-outline{background:transparent;color:var(--color-secondary);border:1.5px solid var(--color-secondary)}
.category-tag-outline:hover{background:var(--color-secondary);color:#fff}

/* ===== Scroll Section ===== */
.scroll-section{transition:opacity 0.5s ease,transform 0.5s ease;opacity:0;transform:translateY(20px)}
.scroll-section.is-visible{opacity:1;transform:translateY(0)}

/* ===== Back to Top ===== */
.back-to-top{position:fixed;bottom:2rem;right:2rem;width:48px;height:48px;border-radius:50%;background:var(--color-primary);color:#fff;font-size:1.4rem;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-md);opacity:0;visibility:hidden;transition:all var(--transition);z-index:900;border:2px solid transparent}
.back-to-top.is-visible{opacity:1;visibility:visible}
.back-to-top:hover,.back-to-top:focus-visible{background:var(--color-primary-hover);border-color:#fff;transform:translateY(-4px)}

/* ===== Responsive ===== */
@media(max-width:1024px){
  .footer-inner{grid-template-columns:1fr 1fr;gap:1.5rem}
  .footer-nav{justify-self:start}
  .grid-4{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  :root{--header-height:64px}
  .nav-toggle{display:flex}
  .header-nav{position:fixed;top:0;left:0;width:100%;height:100vh;height:100dvh;background:var(--color-accent);flex-direction:column;justify-content:center;align-items:center;opacity:0;visibility:hidden;transition:all var(--transition);z-index:999;padding:2rem}
  .header-nav[data-open]{opacity:1;visibility:visible}
  .nav-list{flex-direction:column;gap:0.5rem;text-align:center;width:100%}
  .nav-link{font-size:1.3rem;padding:0.8rem 2rem;width:100%;max-width:280px;text-align:center}
  .header-status{display:none}
  .header-inner{padding:0 1rem}
  .footer-inner{grid-template-columns:1fr;gap:1.5rem;text-align:center}
  .footer-nav-list{align-items:center}
  .footer-trust{max-width:100%}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .container{padding:0 1rem}
  .back-to-top{bottom:1.2rem;right:1.2rem;width:42px;height:42px;font-size:1.2rem}
}
@media(max-width:480px){
  .site-main{padding:1rem 0}
  .section{padding:2rem 0}
  .data-card{padding:1.2rem}
  .archive-folder{padding:1.2rem}
}

/* ===== Print ===== */
@media print{
  .site-header,.site-footer,.back-to-top,.reading-progress,.nav-toggle{display:none!important}
  .site-main{padding-top:0}
  body{background:#fff;color:#000}
}