:root{
    --bg:#0a0e14; --bg-2:#0d1119; --surface:#11161f; --card:#151b26;
    --border:rgba(255,255,255,.07); --text:#ffffff; --text-soft:#f1f5f9;
    --muted:#b3bcc9; --link:#ffffff; --teal:#2dd4bf;
    --grad:linear-gradient(90deg,#3b82f6,#2dd4bf);
    --shadow-lg:0 20px 40px rgba(0,0,0,.4);
    --shadow-sm:0 4px 12px rgba(0,0,0,.2);
  }
  body.light{
    --bg:#f4f7fb; --bg-2:#eef2f7; --surface:#ffffff; --card:#ffffff;
    --border:rgba(15,23,42,.09); --text:#0a1220; --text-soft:#1c2737;
    --muted:#4b5870; --shadow-lg:0 20px 40px rgba(15,23,42,.1);
    --shadow-sm:0 4px 12px rgba(15,23,42,.07);
  }
  *{margin:0;padding:0;box-sizing:border-box}
  [hidden]{display:none !important}
  html{scroll-behavior:smooth}
  body{
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
    background:var(--bg);color:var(--text);line-height:1.7;
    transition:background .3s ease,color .3s ease;
    -webkit-font-smoothing:antialiased;
  }
  img{display:block}
  a{text-decoration:none}

  .site-header{
    position:sticky;top:0;z-index:50;display:flex;justify-content:space-between;align-items:center;
    padding:14px 24px;background:var(--bg);border-bottom:1px solid var(--border);
    backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  }
  body.light .site-header{background:rgba(244,247,251,.85)}
  body:not(.light) .site-header{background:rgba(10,14,20,.85)}

  .brand{display:flex;align-items:center;gap:12px;transition:transform .2s ease}
  .brand:hover{transform:translateY(-1px)}
  .brand-logo{
    width:42px;height:42px;border-radius:10px;object-fit:cover;box-shadow:var(--shadow-sm);
  }
  .brand-name{
    font-size:21px;font-weight:800;background:linear-gradient(90deg,#34d399,#2dd4bf);
    -webkit-background-clip:text;background-clip:text;color:transparent;letter-spacing:-.3px;
  }

  .menu-btn{
    background:none;border:none;cursor:pointer;display:flex;flex-direction:column;
    gap:5px;padding:8px;border-radius:8px;transition:background .2s ease;
  }
  .menu-btn:hover{background:var(--surface)}
  .menu-btn span{width:24px;height:2.5px;background:var(--text);border-radius:2px;transition:all .25s ease}
  .menu-btn.active span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
  .menu-btn.active span:nth-child(2){opacity:0}
  .menu-btn.active span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}

  .lang-switcher{
    display:inline-flex;align-items:center;justify-content:center;padding:9px 16px;
    border-radius:999px;border:1px solid var(--border);background:var(--surface);
    color:var(--text);font-weight:700;font-size:13px;letter-spacing:.5px;
    transition:all .2s ease;white-space:nowrap;
  }
  .lang-switcher:hover{border-color:var(--teal);color:var(--teal);transform:translateY(-1px)}

  .header-actions{display:flex;align-items:center;gap:8px}

  .menu{
    position:absolute;top:66px;right:16px;background:var(--card);border:1px solid var(--border);
    border-radius:14px;padding:8px;min-width:220px;display:none;flex-direction:column;
    box-shadow:var(--shadow-lg);
  }
  .menu.open{display:flex;animation:menuIn .2s ease}
  @keyframes menuIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}
  .menu a{color:var(--text);padding:12px 14px;border-radius:10px;font-weight:600;font-size:15px;transition:background .2s ease}
  .menu a:hover{background:var(--surface)}

  .breadcrumb{display:flex;align-items:center;gap:10px;padding:20px 24px 0;font-size:14px;max-width:760px;margin:0 auto}
  .breadcrumb a{color:var(--muted);font-weight:600;transition:color .2s ease}
  .breadcrumb a:hover{color:var(--text)}
  .breadcrumb i{color:var(--muted);font-style:normal}
  .breadcrumb .current{color:var(--text)}

  footer{border-top:1px solid var(--border);padding:28px 24px;color:var(--muted);font-size:15px;max-width:960px;margin:0 auto}
  .terms-link{
    background:none;border:none;padding:0;margin-top:12px;color:var(--muted);font-size:15px;
    font-weight:600;cursor:pointer;display:block;text-align:left;transition:color .2s ease;
  }
  .terms-link:hover{color:var(--text)}

  .fab{
    position:fixed;right:16px;bottom:24px;width:48px;height:48px;border-radius:50%;
    background:var(--card);border:1px solid var(--border);color:var(--text);
    display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:60;
    box-shadow:var(--shadow-sm);transition:all .25s ease;
  }
  .fab:hover{transform:scale(1.08)}

  .modal{
    position:fixed;inset:0;background:rgba(0,0,0,.65);backdrop-filter:blur(8px);
    z-index:100;display:none;align-items:center;justify-content:center;padding:20px;
  }
  .modal.open{display:flex;animation:fadeIn .2s ease}
  @keyframes fadeIn{from{opacity:0}to{opacity:1}}
  .modal-card{
    background:var(--surface);border:1px solid var(--border);border-radius:18px;max-width:560px;
    width:100%;max-height:85vh;overflow-y:auto;padding:28px;box-shadow:var(--shadow-lg);
  }
  .modal-card h2{font-size:24px;margin-bottom:14px;letter-spacing:-.3px}
  .modal-card>p{color:var(--muted);margin-bottom:18px}
  .modal-card h3{font-size:15px;margin:18px 0 6px;color:var(--text)}
  .modal-card .t{color:var(--muted);font-size:14px}
  .modal-close{
    margin-top:22px;width:100%;padding:13px;border:none;border-radius:12px;cursor:pointer;
    background:var(--grad);color:#fff;font-weight:700;font-size:15px;transition:transform .2s ease;
  }
  .modal-close:hover{transform:translateY(-1px)}

  /* ─── Article pages ─────────────────────────────── */
  .article-page{max-width:760px;margin:0 auto;padding:36px 24px 64px}
  .article-head{text-align:center;margin-bottom:12px;padding-bottom:28px;position:relative}
  .article-head::after{
    content:"";position:absolute;left:50%;bottom:0;transform:translateX(-50%);
    width:56px;height:4px;border-radius:2px;background:var(--grad);
  }
  .article-tag{
    display:inline-block;padding:6px 16px;border-radius:999px;font-size:12px;font-weight:700;
    letter-spacing:1px;color:var(--teal);border:1px solid rgba(45,212,191,.4);
    background:rgba(45,212,191,.08);margin-bottom:18px;text-transform:uppercase;
    box-shadow:0 0 0 4px rgba(45,212,191,.05);
  }
  .article-head h1{font-size:32px;font-weight:800;letter-spacing:-.5px;line-height:1.28;color:var(--text)}
  .article-meta{
    display:flex;gap:10px;align-items:center;justify-content:center;flex-wrap:wrap;
    color:var(--muted);font-size:13px;margin-top:16px;
  }
  .article-meta .author{display:inline-flex;align-items:center;gap:6px;color:var(--text);font-weight:600}
  .article-body{color:var(--text-soft);font-size:17px;line-height:1.85;margin-top:8px}
  .article-body h2{
    font-size:23px;font-weight:800;margin:44px 0 18px;color:var(--text);
    padding-left:14px;border-left:4px solid var(--teal);letter-spacing:-.3px;
  }
  .article-body h3{font-size:19px;font-weight:700;margin:30px 0 12px;color:var(--text)}
  .article-body p{margin-bottom:20px}
  .article-body ul,.article-body ol{margin:0 0 22px;padding-left:24px}
  .article-body[dir="rtl"] h2{padding-left:0;padding-right:14px;border-left:none;border-right:4px solid var(--teal)}
  .article-body[dir="rtl"] ul,.article-body[dir="rtl"] ol{padding-left:0;padding-right:24px}
  .article-body li{margin-bottom:8px}
  .article-body li::marker{color:var(--teal)}
  .article-body a{color:var(--text);font-weight:600;border-bottom:1px solid rgba(255,255,255,.35);transition:border-color .2s}
  .article-body a:hover{border-color:var(--text)}
  .article-body blockquote{
    border-left:4px solid var(--teal);padding:16px 20px;margin:24px 0;position:relative;
    background:linear-gradient(90deg,rgba(45,212,191,.08),var(--surface));border-radius:0 10px 10px 0;
    font-style:italic;color:var(--text);
  }
  .article-body[dir="rtl"] blockquote{border-left:none;border-right:4px solid var(--teal);border-radius:10px 0 0 10px;
    background:linear-gradient(-90deg,rgba(45,212,191,.08),var(--surface))}
  .article-body code{
    font-family:Consolas,Monaco,monospace;font-size:.88em;background:var(--card);
    border:1px solid var(--border);border-radius:6px;padding:2px 7px;color:var(--teal);
  }
  .article-body pre{
    background:var(--card);border:1px solid var(--border);border-radius:12px;padding:18px 20px;
    overflow-x:auto;margin:0 0 22px;line-height:1.6;
  }
  .article-body pre code{background:none;border:none;padding:0;color:var(--text-soft)}
  .article-nav{
    display:flex;justify-content:space-between;gap:14px;margin-top:52px;padding-top:28px;
    border-top:1px solid var(--border);flex-wrap:wrap;
  }
  .article-nav a{
    display:inline-flex;flex-direction:column;gap:4px;min-width:0;padding:16px 20px;border-radius:14px;
    background:var(--card);border:1px solid var(--border);color:var(--text);
    font-weight:700;font-size:15px;transition:all .22s ease;max-width:100%;
  }
  .article-nav a:hover{transform:translateY(-3px);border-color:rgba(45,212,191,.5);box-shadow:var(--shadow-sm)}
  .article-nav .nav-prev{align-items:flex-start;text-align:left}
  .article-nav .nav-next{align-items:flex-end;text-align:right;margin-left:auto}
  .article-nav small{display:flex;align-items:center;gap:6px;color:var(--muted);font-weight:600;font-size:11px;text-transform:uppercase;letter-spacing:1px;margin-bottom:2px}
  .article-nav .nav-prev small::before{content:"←"}
  .article-nav .nav-next small::after{content:"→"}
  .article-nav a span{display:block;max-width:100%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .article-nav a:hover{color:var(--text)}
  html[dir="rtl"] .article-nav .nav-prev small::before,
  .article-body[dir="rtl"] ~ .article-nav .nav-prev small::before{content:"→"}
  html[dir="rtl"] .article-nav .nav-next small::after,
  .article-body[dir="rtl"] ~ .article-nav .nav-next small::after{content:"←"}
  @media(max-width:600px){
    .article-page{padding:26px 18px 48px}
    .article-head h1{font-size:25px}
    .article-body{font-size:16px}
    .article-nav{flex-direction:column}
    .article-nav .nav-next,.article-nav .nav-prev{align-items:flex-start;text-align:left;margin-left:0}
    .article-nav .nav-next small::after{display:none}
    .article-nav .nav-prev{flex-direction:row-reverse}
  }