:root{
  --bg:#ffffff; --fg:#0f172a; --muted:#64748b; --line:#e5e7eb;
  --brand:#0ea5e9; --brand-ink:#075985; --chip:#f1f5f9; --chip-soft:#ecfeff;
}
html,body{margin:0;padding:0;color:var(--fg);background:var(--bg);font-family:Segoe UI,system-ui,-apple-system,"Noto Sans Thai",sans-serif;}
.container{max-width:1200px;margin:18px auto;padding:0 20px;}

/* === Topbar: ขนาดคงที่ทุกหน้า === */
.topbar{
  position:sticky; top:0; z-index:50;
  display:flex; align-items:center; justify-content:space-between;
  height:64px; padding:0 20px; border-bottom:1px solid var(--line); background:var(--bg);
}

/* Left side */
.topbar__left{display:flex;align-items:center;gap:16px;}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--fg);font-weight:700;}
.brand__logo{width:28px;height:28px;border-radius:8px;background:var(--brand);color:#fff;display:grid;place-items:center;font-size:14px;font-weight:800;}
.brand__name{letter-spacing:.2px}

/* Menu */
.menu{display:flex;align-items:center;gap:8px;position:relative;}
.menu__toggle{display:none;border:1px solid var(--line);background:var(--bg);border-radius:8px;padding:6px 10px;}
.menu__items{display:flex;align-items:center;gap:12px;}
.menu__link{padding:8px 10px;border-radius:10px;text-decoration:none;color:#334155;font-weight:500;}
.menu__link:hover{background:var(--chip);}
.menu__link.is-active{background:var(--chip-soft);color:var(--brand-ink);border:1px solid color-mix(in oklab,var(--brand) 25%, transparent);}
.menu__sep{width:1px;height:20px;background:var(--line);margin:0 6px;}

/* Right side */
.topbar__right{display:flex;align-items:center;gap:10px;}
.chip{display:inline-flex;align-items:center;gap:6px;padding:6px 10px;border-radius:999px;background:var(--chip);font-size:12.5px;color:var(--brand-ink);border:1px solid color-mix(in oklab,var(--brand) 20%, transparent);}
.chip--soft{background:var(--chip-soft);}
.userdrop{position:relative;}
.userdrop__btn{display:flex;align-items:center;gap:8px;background:transparent;border:1px solid var(--line);padding:4px 8px;border-radius:12px;cursor:pointer;}
.userdrop__btn:focus{outline:2px solid var(--brand);outline-offset:2px;}
.avatar{width:24px;height:24px;border-radius:999px;background:var(--brand);color:#fff;display:grid;place-items:center;font-weight:800;font-size:12px;}
.avatar--lg{width:36px;height:36px;font-size:14px;}
.userdrop__name{max-width:160px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.caret{opacity:.7;}

.userdrop__menu{position:absolute;right:0;top:calc(100% + 6px);min-width:240px;background:var(--bg);border:1px solid var(--line);border-radius:14px;box-shadow:0 12px 32px rgba(0,0,0,.12);padding:8px;display:none;}
.userdrop__menu.open{display:block;}
.userdrop__header{display:flex;gap:10px;align-items:center;padding:8px;border-bottom:1px dashed var(--line);margin-bottom:6px;}
.u-name{font-weight:700;}
.u-meta{color:var(--muted);font-size:12px;}
.userdrop__item{display:block;padding:8px 10px;border-radius:10px;text-decoration:none;color:var(--fg);}
.userdrop__item:hover{background:var(--chip);}
.userdrop__item.danger{color:#dc2626;}
.userdrop__sep{height:1px;background:var(--line);margin:6px 0;}

/* Responsive */
@media (max-width: 880px){
  .brand__name{display:none;}
  .menu__toggle{display:inline-block;}
  .menu__items{display:none;position:absolute;left:0;right:0;top:56px;padding:10px 20px;gap:8px;background:var(--bg);border-bottom:1px solid var(--line);}
  .menu__items.open{display:flex;flex-wrap:wrap;}
}