/* Reset & Base */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;font-size:16px;-webkit-text-size-adjust:100%;}
body{font-family:'Segoe UI','Helvetica Neue',Arial,sans-serif;font-weight:400;line-height:1.6;color:#1C1C1E;background:#F8F9FA;min-height:100vh;}
h1,h2,h3,h4,h5,h6{font-family:Georgia,'Times New Roman',serif;font-weight:700;line-height:1.2;}
code,pre,.stat{font-family:'Fira Code','Courier New',monospace;}
a{color:#1B7A3D;text-decoration:none;transition:color 0.2s;}
a:hover{color:#F28C28;}
a:focus-visible{outline:2px solid #1E90FF;outline-offset:2px;}
img{max-width:100%;display:block;}
ul,ol{list-style:none;}
button{cursor:pointer;font:inherit;border:none;background:none;}
:focus-visible{outline:2px solid #1E90FF;outline-offset:2px;}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:0.01ms!important;transition-duration:0.01ms!important;scroll-behavior:auto!important;}}

/* Variables */
:root{
  --green:#1B7A3D;
  --green-light:#2E9E50;
  --orange:#F28C28;
  --orange-dark:#D9771A;
  --blue:#1E90FF;
  --blue-dark:#1C7ED6;
  --bg-light:#F8F9FA;
  --bg-dark:#1A1A2E;
  --text-dark:#1C1C1E;
  --text-light:#FFFFFF;
  --font-heading:Georgia,'Times New Roman',serif;
  --font-body:'Segoe UI','Helvetica Neue',Arial,sans-serif;
  --font-mono:'Fira Code','Courier New',monospace;
  --max-width:1200px;
  --border-radius:4px;
  --shadow:0 2px 8px rgba(0,0,0,0.08);
  --transition:0.3s ease;
}

/* Skip link */
.skip-link{position:absolute;top:-100px;left:0;z-index:1000;padding:0.5rem 1rem;background:var(--blue);color:#fff;font-weight:700;}
.skip-link:focus{top:0;}

/* Header */
.site-header{position:sticky;top:0;z-index:100;background:rgba(248,249,250,0.95);backdrop-filter:blur(4px);border-bottom:2px solid var(--green);}
.header-inner{display:flex;align-items:center;justify-content:space-between;max-width:var(--max-width);margin:0 auto;padding:0.5rem 1rem;gap:1rem;}
.brand{font-family:var(--font-heading);font-size:1.5rem;font-weight:700;color:var(--green);text-transform:uppercase;letter-spacing:0.05em;}
.brand:hover{color:var(--orange-dark);}
.nav-container{display:flex;align-items:center;gap:2rem;}
.nav-list{display:flex;gap:1.5rem;}
.nav-list a{font-size:0.95rem;font-weight:600;color:var(--text-dark);padding:0.3rem 0;border-bottom:2px solid transparent;transition:border-color 0.2s,color 0.2s;}
.nav-list a:hover,.nav-list a[aria-current="page"]{color:var(--green);border-bottom-color:var(--green);}
.switch-wrapper{display:flex;align-items:center;gap:0.5rem;}
.switch-label{font-size:0.85rem;color:var(--text-dark);font-weight:600;}
.switch-btn{background:var(--green);color:#fff;padding:0.3rem 0.8rem;border-radius:20px;font-size:0.85rem;font-weight:600;transition:background 0.2s;}
.switch-btn[aria-pressed="true"]{background:var(--orange);}
.switch-btn:hover{background:var(--orange-dark);}
.nav-toggle{display:none;flex-direction:column;gap:4px;padding:0.4rem;border-radius:4px;background:var(--green);}
.toggle-bar{display:block;width:24px;height:3px;background:#fff;border-radius:2px;transition:transform 0.3s;}

/* Mobile nav */
@media (max-width:768px){
  .nav-container{position:fixed;top:56px;left:0;right:0;background:rgba(248,249,250,0.98);flex-direction:column;padding:1rem;gap:1rem;transform:translateX(100%);transition:transform 0.3s;z-index:99;}
  .nav-container[data-open]{transform:translateX(0);}
  .nav-list{flex-direction:column;align-items:center;gap:0.8rem;width:100%;}
  .nav-toggle{display:flex;}
  .switch-wrapper{width:100%;justify-content:center;}
}
@media (min-width:769px){
  .nav-container{position:static;transform:none;background:transparent;flex-direction:row;}
}

/* Footer */
.site-footer{background:var(--bg-dark);color:var(--text-light);padding:2rem 1rem 1.5rem;}
.footer-inner{max-width:var(--max-width);margin:0 auto;display:flex;flex-direction:column;gap:1rem;align-items:center;text-align:center;}
.footer-brand .brand{font-size:1.3rem;color:var(--green-light);}
.footer-slogan{font-size:0.9rem;color:rgba(255,255,255,0.7);margin-top:0.2rem;}
.footer-nav{display:flex;flex-wrap:wrap;gap:1rem;justify-content:center;}
.footer-nav a{color:var(--blue);font-size:0.9rem;padding:0.2rem 0.5rem;border-bottom:1px solid transparent;}
.footer-nav a:hover{color:var(--orange);border-bottom-color:var(--orange);}
.footer-info{display:flex;flex-wrap:wrap;gap:0.5rem;justify-content:center;font-size:0.85rem;}
.footer-icp,.footer-copyright,.footer-contact{color:rgba(255,255,255,0.6);}
.footer-copyright{margin-top:0.5rem;}
@media (max-width:480px){
  .footer-nav{flex-direction:column;gap:0.5rem;}
  .footer-info{flex-direction:column;}
}

/* Common components */
.content-container{max-width:var(--max-width);margin:0 auto;padding:1.5rem 1rem;}
.page-title{font-size:2rem;margin-bottom:1.5rem;border-left:4px solid var(--orange);padding-left:0.8rem;}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:0.3rem;font-size:0.9rem;color:var(--text-dark);}
.breadcrumb a{color:var(--green);}
.breadcrumb a:hover{text-decoration:underline;}
.breadcrumb li+li::before{content:"/";margin:0 0.3rem;color:#999;}

/* Buttons */
.button{display:inline-block;padding:0.6rem 1.4rem;border-radius:var(--border-radius);font-weight:600;transition:background 0.2s,color 0.2s;text-align:center;}
.button-primary{background:var(--green);color:#fff;}
.button-primary:hover{background:var(--green-light);}
.button-secondary{background:transparent;border:2px solid var(--orange);color:var(--orange);}
.button-secondary:hover{background:var(--orange);color:#fff;}

/* Grid */
.grid{display:grid;gap:1.5rem;}
.grid-2{grid-template-columns:repeat(2,1fr);}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-4{grid-template-columns:repeat(4,1fr);}
@media (max-width:768px){
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr;}
}
@media (min-width:769px) and (max-width:1024px){
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr);}
}

/* Card */
.card{background:#fff;border-radius:var(--border-radius);box-shadow:var(--shadow);padding:1.5rem;transition:transform 0.3s,box-shadow 0.3s;}
.card:hover{transform:translateY(-4px);box-shadow:0 6px 16px rgba(0,0,0,0.12);}
.card-header{border-bottom:1px solid #eee;padding-bottom:0.8rem;margin-bottom:0.8rem;}

/* Tag */
.tag{display:inline-block;padding:0.2rem 0.6rem;font-size:0.8rem;font-weight:600;border-radius:2px;}
.tag-green{background:var(--green);color:#fff;}
.tag-orange{background:var(--orange);color:#fff;}

/* Stat & mono */
.stat{font-family:var(--font-mono);font-size:1.8rem;font-weight:700;color:var(--green);}

/* Image placeholder (for pages to extend) */
.img-placeholder{background:#e0e0e0;position:relative;overflow:hidden;min-height:120px;display:flex;align-items:center;justify-content:center;color:#999;font-size:0.9rem;}
.img-placeholder::after{content:"📷";font-size:2rem;opacity:0.5;}

/* Progress bar */
#progress-bar{position:fixed;top:0;left:0;height:3px;background:var(--orange);z-index:200;width:0%;transition:width 0.1s ease;}
@media (prefers-reduced-motion:reduce){#progress-bar{transition:none;}}