/* ===== RESET ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{min-height:100vh;line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
img,picture,video,canvas,svg{display:block;max-width:100%}
input,button,textarea,select{font:inherit}
ul,ol{list-style:none}
a{text-decoration:none;color:inherit}
button{cursor:pointer;border:none;background:none}
:focus-visible{outline:3px solid var(--color-accent);outline-offset:2px;border-radius:2px}

/* ===== VARIABLES ===== */
:root{
  --color-primary:#2E7D32;
  --color-primary-light:#C8E6C9;
  --color-secondary:#B0BEC5;
  --color-accent:#FF5722;
  --color-accent-light:#FFCCBC;
  --color-dark:#121212;
  --color-gray:#424242;
  --color-light:#FFFFFF;
  --font-heading:'Inter','Helvetica Neue',Arial,sans-serif;
  --font-body:'Inter','Open Sans',Arial,sans-serif;
  --font-mono:'JetBrains Mono','Cascadia Code','SF Mono',monospace;
  --size-title1:2.5rem;
  --size-title2:2rem;
  --size-body:1rem;
  --size-small:0.8rem;
  --weight-bold:900;
  --weight-normal:400;
  --radius:4px;
  --shadow-card:0 2px 8px rgba(0,0,0,0.08),0 1px 3px rgba(0,0,0,0.05);
  --shadow-lift:0 8px 24px rgba(0,0,0,0.12),0 2px 6px rgba(0,0,0,0.06);
  --transition-fast:150ms ease;
  --transition-base:300ms ease;
  --nav-width:100px;
  --header-top-height:64px;
}

/* ===== BASE TYPOGRAPHY ===== */
body{
  font-family:var(--font-body);
  font-weight:var(--weight-normal);
  font-size:var(--size-body);
  color:var(--color-dark);
  background:var(--color-light);
  line-height:1.7;
}
h1,h2,h3,h4,h5,h6{
  font-family:var(--font-heading);
  font-weight:var(--weight-bold);
  font-style:italic;
  line-height:1.15;
  letter-spacing:-0.01em;
}
h1{font-size:var(--size-title1)}h2{font-size:var(--size-title2)}h3{font-size:1.5rem}
a{color:var(--color-primary);transition:color var(--transition-fast)}
a:hover{color:var(--color-accent)}
::selection{background:var(--color-primary-light);color:var(--color-dark)}

/* ===== CONTAINER ===== */
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 1.5rem}

/* ===== SKIP LINK ===== */
.skip-link{
  position:fixed;top:-100%;left:0;z-index:10000;
  padding:0.75rem 1.5rem;background:var(--color-accent);color:var(--color-light);
  font-family:var(--font-heading);font-weight:var(--weight-bold);font-style:italic;
  border-radius:0 0 var(--radius) 0;transition:top var(--transition-fast);
}
.skip-link:focus{top:0;outline:none}

/* ===== READING PROGRESS ===== */
.reading-progress{
  position:fixed;top:0;left:0;z-index:9999;
  width:0%;height:4px;
  background:linear-gradient(90deg,var(--color-accent),var(--color-primary));
  transition:width 100ms linear;pointer-events:none;
}

/* ===== HEADER ===== */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:9000;
  background:var(--color-dark);
  padding:0 1.5rem;
  height:var(--header-top-height);
  display:flex;align-items:center;
  box-shadow:0 2px 12px rgba(0,0,0,0.3);
}
.header__top{
  display:flex;align-items:center;gap:1.25rem;
  width:100%;max-width:1200px;margin:0 auto;
}

/* ===== BRAND ===== */
.brand{display:flex;align-items:baseline;gap:0.75rem;flex-shrink:0}
.brand__logo{
  font-family:var(--font-heading);
  font-weight:var(--weight-bold);
  font-style:italic;
  font-size:1.5rem;
  color:var(--color-light);
  line-height:1;
}
.brand__digits{font-family:var(--font-mono);font-style:normal;color:var(--color-accent)}
.brand__name{color:var(--color-light)}
.brand__tagline{
  font-family:var(--font-body);
  font-size:var(--size-small);
  color:var(--color-secondary);
  font-weight:var(--weight-normal);
  font-style:normal;
  display:none;
}
@media(min-width:640px){.brand__tagline{display:inline}}

/* ===== BUTTONS ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:0.5rem 1.25rem;
  font-family:var(--font-heading);
  font-weight:var(--weight-bold);
  font-style:italic;
  font-size:var(--size-small);
  line-height:1;
  border-radius:var(--radius);
  transition:transform var(--transition-fast),box-shadow var(--transition-fast);
  white-space:nowrap;
}
.btn:hover{transform:scale(1.04);box-shadow:var(--shadow-lift)}
.btn-primary{background:var(--color-primary);color:var(--color-light)}
.btn-accent{background:var(--color-accent);color:var(--color-light)}
.header__cta{flex-shrink:0}

/* ===== NAV TOGGLE (mobile) ===== */
.nav-toggle{
  display:flex;flex-direction:column;gap:5px;
  width:36px;height:36px;align-items:center;justify-content:center;
  background:transparent;border:2px solid var(--color-secondary);
  border-radius:var(--radius);margin-left:auto;flex-shrink:0;
  transition:border-color var(--transition-fast);
}
.nav-toggle__bar{
  display:block;width:20px;height:2px;
  background:var(--color-secondary);
  transition:transform var(--transition-base),opacity var(--transition-base);
  border-radius:1px;
}
[data-open] .nav-toggle__bar:nth-child(1){transform:translateY(7px) rotate(45deg)}
[data-open] .nav-toggle__bar:nth-child(2){opacity:0}
[data-open] .nav-toggle__bar:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
@media(min-width:769px){.nav-toggle{display:none}}

/* ===== NAV (side rail desktop / drawer mobile) ===== */
.nav{
  background:var(--color-dark);
  border-left:1px solid rgba(176,190,197,0.15);
}
@media(max-width:768px){
  .nav{
    position:fixed;top:var(--header-top-height);right:0;bottom:0;
    width:280px;z-index:9000;
    transform:translateX(100%);
    transition:transform var(--transition-base);
    padding:2rem 1.5rem;
    overflow-y:auto;
    box-shadow:-4px 0 20px rgba(0,0,0,0.5);
  }
  .nav[data-open]{transform:translateX(0)}
  .nav__list{display:flex;flex-direction:column;gap:0.5rem}
  .nav__link{
    display:block;padding:0.75rem 1rem;
    font-family:var(--font-heading);font-weight:var(--weight-bold);font-style:italic;
    color:var(--color-secondary);border-radius:var(--radius);
    transition:background var(--transition-fast),color var(--transition-fast);
    font-size:1.1rem;
  }
  .nav__link:hover,.nav__link:focus{background:rgba(46,125,50,0.2);color:var(--color-light)}
  .nav__link[aria-current="page"]{
    color:var(--color-accent);
    border-left:4px solid var(--color-accent);
    padding-left:calc(1rem - 4px);
  }
}
@media(min-width:769px){
  .nav{
    position:fixed;top:50%;right:0;transform:translateY(-50%);
    width:var(--nav-width);z-index:8000;
    background:transparent;
    border-left:none;
    padding:0.5rem 0;
  }
  .nav__list{display:flex;flex-direction:column;align-items:flex-end;gap:0.25rem}
  .nav__item{width:100%}
  .nav__link{
    display:flex;align-items:center;justify-content:flex-end;
    gap:0.75rem;
    padding:0.5rem 1.25rem 0.5rem 0.75rem;
    font-family:var(--font-heading);font-weight:var(--weight-bold);font-style:italic;
    font-size:var(--size-small);
    color:var(--color-secondary);
    transition:color var(--transition-fast),background var(--transition-fast);
    border-radius:var(--radius) 0 0 var(--radius);
    position:relative;
    white-space:nowrap;
  }
  .nav__link::before{
    content:'';display:block;
    width:8px;height:8px;
    border-radius:50%;
    background:var(--color-secondary);
    flex-shrink:0;
    transition:background var(--transition-fast),transform var(--transition-fast);
  }
  .nav__link:hover{color:var(--color-light);background:rgba(46,125,50,0.15)}
  .nav__link:hover::before{background:var(--color-primary);transform:scale(1.3)}
  .nav__link[aria-current="page"]{color:var(--color-accent)}
  .nav__link[aria-current="page"]::before{background:var(--color-accent);transform:scale(1.4);box-shadow:0 0 8px rgba(255,87,34,0.5)}
}

/* ===== MAIN CONTENT OFFSET ===== */
#main-content{display:block;padding-top:calc(var(--header-top-height) + 1rem)}
@media(min-width:769px){#main-content{padding-right:var(--nav-width)}}

/* ===== FOOTER ===== */
.site-footer{
  background:var(--color-gray);
  color:var(--color-light);
  padding:3rem 1.5rem 1.5rem;
  font-size:var(--size-small);
  line-height:1.7;
}
.footer__inner{
  max-width:1200px;margin:0 auto;
  display:grid;grid-template-columns:1fr;
  gap:2rem;
}
@media(min-width:640px){
  .footer__inner{
    grid-template-columns:1fr 1fr;
  }
}
@media(min-width:960px){
  .footer__inner{
    grid-template-columns:2fr 1fr 2fr 1fr;
  }
}
.footer__logo{
  font-family:var(--font-heading);font-weight:var(--weight-bold);font-style:italic;
  font-size:1.25rem;color:var(--color-light);
}
.footer__digits{font-family:var(--font-mono);font-style:normal;color:var(--color-accent)}
.footer__tagline{color:var(--color-secondary);margin-top:0.25rem;font-style:normal;font-weight:var(--weight-normal)}
.footer__trust{color:var(--color-secondary);margin-top:0.75rem;font-style:italic;font-size:var(--size-small);opacity:0.8}
.footer__nav .footer__links{display:flex;flex-direction:column;gap:0.5rem}
.footer__links a{
  color:var(--color-secondary);
  transition:color var(--transition-fast),padding-left var(--transition-fast);
  padding-left:0;
}
.footer__links a:hover{color:var(--color-accent);padding-left:4px}
.footer__contact-item{margin-bottom:0.4rem;color:var(--color-secondary)}
.footer__contact-label{font-weight:var(--weight-bold);color:var(--color-light)}
.footer__contact-note{color:var(--color-secondary);font-style:italic;margin-top:0.5rem;font-size:var(--size-small);opacity:0.7}
.footer__bottom{
  grid-column:1/-1;
  display:flex;flex-direction:column;gap:0.25rem;
  padding-top:1.5rem;border-top:1px solid rgba(176,190,197,0.2);
  text-align:center;
}
.footer__copyright,.footer__icp{color:var(--color-secondary);font-size:var(--size-small)}
@media(min-width:640px){.footer__bottom{flex-direction:row;justify-content:space-between;text-align:left}}

/* ===== SECTION PANEL (paper stack) ===== */
.section{
  background:var(--color-light);
  border:1px solid var(--color-secondary);
  border-radius:var(--radius);
  padding:2rem 1.5rem;
  margin-bottom:2rem;
  box-shadow:var(--shadow-card);
  position:relative;
  transition:box-shadow var(--transition-base),transform var(--transition-base);
}
.section:hover{box-shadow:var(--shadow-lift)}
.section::after{
  content:'';position:absolute;top:4px;left:4px;right:-4px;bottom:-4px;
  border:1px solid var(--color-secondary);
  border-radius:var(--radius);
  z-index:-1;opacity:0.3;
}
.section-title{
  font-family:var(--font-heading);font-weight:var(--weight-bold);font-style:italic;
  font-size:var(--size-title2);
  color:var(--color-dark);
  margin-bottom:1rem;
  padding-bottom:0.5rem;
  border-bottom:3px solid var(--color-primary);
  display:inline-block;
}

/* ===== CARD ===== */
.card{
  background:var(--color-light);
  border:1px solid var(--color-secondary);
  border-radius:var(--radius);
  padding:1.25rem;
  box-shadow:var(--shadow-card);
  transition:box-shadow var(--transition-base),transform var(--transition-base);
}
.card:hover{box-shadow:var(--shadow-lift);transform:translateY(-2px)}

/* ===== TAG ===== */
.tag{
  display:inline-block;
  font-family:var(--font-heading);font-weight:var(--weight-bold);font-style:italic;
  font-size:var(--size-small);
  background:var(--color-primary-light);
  color:var(--color-dark);
  padding:0.2rem 0.6rem;
  border-radius:2px;
  line-height:1.4;
}

/* ===== PAGE GRID ===== */
.page-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:1.5rem;
}
@media(min-width:640px){.page-grid{grid-template-columns:1fr 1fr}}
@media(min-width:960px){.page-grid{grid-template-columns:2fr 1fr}}

/* ===== RESPONSIVE HELPERS ===== */
@media(max-width:480px){
  :root{--size-title1:1.75rem;--size-title2:1.5rem}
  .header__cta{font-size:0.7rem;padding:0.4rem 0.9rem}
}
@media(min-width:769px) and (max-width:1024px){
  :root{--nav-width:80px}
  .nav__link{font-size:0.7rem;padding:0.4rem 0.8rem 0.4rem 0.5rem}
}

/* ===== PREFERS REDUCED MOTION ===== */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{transition-duration:0ms!important;animation-duration:0ms!important}
  html{scroll-behavior:auto}
  .nav{transition:none}
  .btn:hover{transform:none}
  .card:hover{transform:none}
  .section:hover{transform:none}
}

/* ===== PRINT ===== */
@media print{
  .site-header,.site-footer,.reading-progress,.nav-toggle,.nav{display:none!important}
  #main-content{padding:0!important}
  body{background:#fff;color:#000;font-size:12pt}
}