/* CSS Variables */
:root{--bg:#fff;--text:#0f172a;--muted:#64748b;--primary:#1e40af;--primary-2:#1d4ed8;--card:#f8fafc;--ring:#93c5fd;--border:#e2e8f0}
:root.dark{--bg:#0b1220;--text:#e5e7eb;--muted:#94a3b8;--primary:#60a5fa;--primary-2:#3b82f6;--card:#0f172a;--ring:#1d4ed8;--border:#1f2937}

/* Base Resets & Mobile Fix */
*{box-sizing:border-box}

html {
  overflow-x: hidden;
  width: 100%;
}

body {
  margin: 0;
  padding: 0;
  overflow-x: hidden;
  width: 100%;
  position: relative;
  font-family: system-ui,-apple-system,Segoe UI,Roboto,Inter,Arial,sans-serif;
  background: var(--bg);
  color: var(--text);
}

/* Links */
a{color:inherit;text-decoration:none}

/* Container */
.container{
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 16px;
}

@media (max-width: 768px) {
  .container {
    padding: 0 12px;
  }
}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--primary);color:#fff;background:var(--primary);padding:10px 16px;border-radius:12px;cursor:pointer;transition:.2s;font-weight:600}
.btn:hover{background:var(--primary-2)}
.btn.ghost{background:transparent;color:var(--primary);border-color:var(--primary)}
.btn[disabled]{opacity:.5;cursor:not-allowed}

.iconbtn{border:1px solid var(--border);padding:8px 10px;border-radius:10px;background:var(--card);cursor:pointer}

/* Tags */
.tag{font-size:.8rem;color:var(--muted);border:1px solid var(--border);padding:2px 8px;border-radius:999px}

/* Grid System */
.grid{display:grid;gap:20px}
.grid.cards{grid-template-columns:repeat(1,minmax(0,1fr))}
@media(min-width:640px){.grid.cards{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(min-width:900px){.grid.cards{grid-template-columns:repeat(3,minmax(0,1fr))}}

/* Cards */
.card{background:var(--card);border:1px solid var(--border);border-radius:16px;overflow:hidden}
.card .body{padding:18px}
.card h3{margin:0 0 6px}
.card p{margin:8px 0 0;line-height:1.6;color:var(--muted)}

/* Header */
.header{
  position:sticky;
  top:0;
  z-index:50;
  background:var(--bg);
  border-bottom:1px solid var(--border);
  backdrop-filter:saturate(180%) blur(8px);
}

.header .bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:12px 0;
  width: 100%;
}

/* Brand/Logo */
.brand{
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:800;
  font-size:1.3rem;
  white-space:nowrap;
  padding:6px 8px;
  border-radius:12px;
  flex-shrink: 1;
  min-width: 0;
}
.brand:hover{background:rgba(125,125,125,.08)}

@media(max-width:768px){
  .brand{
    font-size:0.95rem;
    gap:6px;
    padding:4px 6px;
  }
}

/* Navigation */
.nav{display:flex;align-items:center;gap:8px}
.nav a{padding:8px 10px;border-radius:10px;color:var(--muted);font-weight:600}
.nav a.active,.nav a:hover{color:var(--text);background:rgba(125,125,125,.08)}

/* Tools (Language switcher, theme, hamburger) */
.tools{
  display:flex;
  align-items:center;
  gap:8px;
  flex-shrink: 0;
  margin-left: auto;
}

@media(max-width:768px){
  .tools{
    gap:4px;
  }
  .tools .iconbtn{
    padding:6px 8px;
  }
}

.flag{font-size:1rem}

/* Language Dropdown */
.lang{position:relative}
.lang .current{display:flex;align-items:center;gap:8px}

@media(max-width:768px){
  .lang .current .small{
    display:none;
  }
  .lang .current{
    gap:4px;
  }
}

.lang .menu{
  position:absolute;
  right:0;
  top:120%;
  background:var(--bg);
  border:1px solid var(--border);
  border-radius:12px;
  box-shadow:0 10px 30px rgba(0,0,0,.15);
  padding:6px;
  display:none;
  min-width:160px;
  z-index:100;
}
.lang.open .menu{display:block}
.lang .opt{display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:10px;cursor:pointer}
.lang .opt:hover{background:rgba(125,125,125,.08)}

/* Mobile Menu */
.hamb{display:none}

@media(max-width:820px){
  .nav{display:none}
  .hamb{display:inline-flex}
  .mobile{display:none;border-top:1px solid var(--border);padding:6px 0}
  .mobile.open{display:block}
  .mobile .nav{display:block !important}
  .mobile .nav a{display:block;margin:4px 0}
}

/* Hero Section */
.hero{position:relative;overflow:hidden;width:100%}
.hero .bg{position:absolute;inset:0;background:radial-gradient(1200px 400px at 10% -10%, rgba(59,130,246,.20), transparent), radial-gradient(1000px 350px at 90% -20%, rgba(245,158,11,.25), transparent)}
.hero .content{position:relative;padding:64px 0 40px;max-width:100%}

/* Typography */
h1{font-size:clamp(34px,4.5vw,60px);line-height:1.05;margin:0 0 12px;max-width:100%;word-wrap:break-word}
.lead{font-size:clamp(18px,2.1vw,22px);color:var(--muted);margin:0 0 20px;max-width:900px}
.kicker{text-transform:uppercase;letter-spacing:.12em;font-weight:700;font-size:.8rem;color:var(--primary);max-width:100%}
.small{font-size:.9rem;color:var(--muted)}

/* Sections */
.section{padding:56px 0;width:100%;max-width:100%;overflow:hidden}
.section h2{font-size:clamp(28px,3.8vw,42px);margin:0 0 12px}
.section .sub{color:var(--muted);margin:0 0 20px}

/* Footer */
.footer{border-top:1px solid var(--border);margin-top:40px}
.footer .row{display:flex;gap:12px;flex-wrap:wrap;align-items:center;justify-content:space-between;padding:16px 0;color:var(--muted)}
.footer a{color:var(--muted)}
.footer a:hover{color:var(--text)}

/* Reader Components */
.reader-wrap{max-width:var(--reader-width, 760px);margin:0 auto}
.reader{font-size:var(--reader-font, 18px);line-height:var(--reader-lh, 1.9)}
.reader p{line-height:1.9;margin:0 0 14px}

.reader-progress{position:sticky;top:0;height:3px;background:linear-gradient(90deg,#1e40af,#1d4ed8);width:0%}

.tooltip{
  position:fixed;
  z-index:60;
  pointer-events:none;
  max-width:60vw;
  background:var(--card);
  color:var(--text);
  border:1px solid var(--border);
  padding:6px 8px;
  border-radius:10px;
  box-shadow:0 10px 30px rgba(0,0,0,.12);
  font-size:.85rem;
}

.en-line{
  border-left:2px solid var(--border);
  padding-left:10px;
  margin:6px 0 12px;
  color:var(--muted);
  font-size:.96em;
}

/* Reader Bottom Toolbar */
.reader-bottom{
  position:sticky;
  bottom:8px;
  z-index:20;
  background:var(--bg);
  backdrop-filter:saturate(180%) blur(8px);
  border:1px solid var(--border);
  border-radius:12px;
  padding:8px;
  display:flex;
  gap:8px;
  align-items:center;
  justify-content:space-between;
  margin-top:12px;
}
.reader-bottom .group{display:flex;gap:8px;align-items:center}
.reader-bottom .label{font-size:.9rem;color:var(--muted)}

/* Reader Font Families */
body[data-reader-font="serif"] .reader{font-family: Georgia, "Times New Roman", serif}
body[data-reader-font="mono"] .reader{font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace}
body[data-reader-font="sans"] .reader{font-family: system-ui,-apple-system,Segoe UI,Roboto,Inter,Arial,sans-serif}

/* Forms */
input,textarea{background:var(--bg);border:1px solid var(--border);padding:10px 12px;border-radius:12px;color:var(--text);width:100%}
label{display:block;font-weight:700;margin:8px 0 6px}
form .row{display:grid;gap:12px;grid-timeline-columns:1fr}

@media(min-width:720px){
  form .row{grid-template-columns:1fr 1fr}
}

/* Misc */
hr.sep{border:none;border-top:1px solid var(--border);margin:24px 0}

img, video, iframe {
  max-width: 100%;
  height: auto;
}

@media(max-width:480px){ 
  .reader-wrap{--reader-width:92vw} 
}