/* ============================================================
   BIÊN BẢN HỌP — Design System dùng chung cho mọi trang
   ============================================================ */
:root{
  --brand-900:#0a2a5e; --brand-700:#0D47A1; --brand-500:#1565C0; --brand-300:#42A5F5;
  --accent:#06b6d4; --accent-2:#0ea5e9;
  --danger:#e5484d; --danger-d:#c4373b; --success:#16a34a; --warn:#f59e0b;
  --ink:#0f172a; --ink-soft:#334155; --muted:#64748b; --faint:#94a3b8;
  --line:#e6ebf3; --bg:#eef2f9; --surface:#ffffff;
  --radius:18px; --radius-sm:12px; --radius-lg:26px;
  --shadow-sm:0 2px 8px rgba(13,71,161,.06);
  --shadow:0 10px 30px rgba(13,71,161,.10);
  --shadow-lg:0 24px 60px rgba(13,71,161,.18);
  --grad-brand:linear-gradient(135deg,#0D47A1 0%,#1565C0 55%,#0ea5e9 100%);
  --grad-soft:linear-gradient(135deg,#f0f6ff 0%,#eaf1fb 100%);
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
html{scroll-behavior:smooth;}
body{
  margin:0; color:var(--ink); background:var(--bg);
  font-family:"Be Vietnam Pro",-apple-system,"Segoe UI",Roboto,system-ui,sans-serif;
  font-size:15px; line-height:1.55; -webkit-font-smoothing:antialiased;
  min-height:100vh; position:relative; overflow-x:hidden;
}
/* nền động: vài quầng sáng trôi nhẹ */
body::before{
  content:""; position:fixed; inset:-20%; z-index:-1; pointer-events:none;
  background:
    radial-gradient(40vw 40vw at 12% 8%, rgba(66,165,245,.16), transparent 60%),
    radial-gradient(38vw 38vw at 88% 18%, rgba(6,182,212,.12), transparent 60%),
    radial-gradient(45vw 45vw at 70% 95%, rgba(21,101,192,.10), transparent 60%);
  animation:bgFloat 22s ease-in-out infinite alternate;
}
@keyframes bgFloat{ from{transform:translate3d(0,0,0) scale(1);} to{transform:translate3d(0,-3%,0) scale(1.06);} }

a{color:var(--brand-500);text-decoration:none;}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:-.01em;}

/* ---------- Thanh trên (sticky, kính mờ) ---------- */
.topbar{
  position:sticky; top:0; z-index:30;
  display:flex; align-items:center; justify-content:space-between; gap:12px;
  padding:14px clamp(16px,4vw,40px);
  background:var(--grad-brand); color:#fff;
  box-shadow:0 6px 24px rgba(13,71,161,.22);
}
.topbar .brand{display:flex;align-items:center;gap:11px;font-weight:900;font-size:18px;letter-spacing:.02em;color:#fff;}
.topbar .brand .logo{
  width:32px;height:32px;border-radius:9px;display:block;padding:0;background:none;
  box-shadow:0 4px 12px rgba(0,0,0,.28);
}
.topbar .brand .rena{background:linear-gradient(120deg,#e2f1ff,#8fd0ff);-webkit-background-clip:text;background-clip:text;color:transparent;}
.topbar .nav{display:flex;align-items:center;gap:6px;}
.topbar .nav a,.topbar .nav button{
  font:inherit;font-size:13.5px;font-weight:600;color:rgba(255,255,255,.92);
  background:transparent;border:0;cursor:pointer;padding:8px 13px;border-radius:10px;transition:.2s var(--ease);
}
.topbar .nav a:hover,.topbar .nav button:hover{background:rgba(255,255,255,.18);color:#fff;}
.who-chip{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:#fff;
  background:rgba(255,255,255,.16);padding:6px 12px;border-radius:30px;font-weight:600;}
.who-chip .av{width:24px;height:24px;border-radius:50%;background:rgba(255,255,255,.25);color:#fff;display:grid;place-items:center;font-size:12px;font-weight:700;}

/* ---------- Khung nội dung ---------- */
.container{max-width:1140px;margin:0 auto;padding:clamp(18px,3vw,34px) clamp(16px,4vw,40px) 60px;}
.container.narrow{max-width:820px;}

/* ---------- Thẻ ---------- */
.card{
  background:var(--surface); border:1px solid rgba(13,71,161,.06);
  border-radius:var(--radius); padding:clamp(18px,2.4vw,26px);
  box-shadow:var(--shadow-sm); transition:transform .35s var(--ease), box-shadow .35s var(--ease);
  animation:fadeInUp .5s var(--ease) both;
}
.card.hover:hover{transform:translateY(-4px);box-shadow:var(--shadow);}
.card h3.section{font-size:15px;color:var(--brand-700);margin-bottom:14px;display:flex;align-items:center;gap:8px;}
.muted{color:var(--muted);font-size:13px;}
.faint{color:var(--faint);}
@keyframes fadeInUp{from{opacity:0;transform:translateY(14px);}to{opacity:1;transform:none;}}
.stagger>*{animation:fadeInUp .5s var(--ease) both;}
.stagger>*:nth-child(2){animation-delay:.06s;}
.stagger>*:nth-child(3){animation-delay:.12s;}
.stagger>*:nth-child(4){animation-delay:.18s;}

/* ---------- Lưới responsive ---------- */
.grid{display:grid;gap:18px;}
.grid-2{grid-template-columns:1fr;}
@media(min-width:760px){.grid-2{grid-template-columns:1fr 1fr;}}

/* ---------- Nút ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font:inherit;font-weight:600;font-size:14.5px;cursor:pointer;
  padding:12px 20px;border-radius:12px;border:1px solid transparent;
  color:#fff;background:var(--grad-brand);background-size:160% 160%;
  box-shadow:0 8px 20px rgba(13,71,161,.25); transition:transform .18s var(--ease),box-shadow .25s var(--ease),background-position .5s var(--ease);
  position:relative;overflow:hidden;
}
.btn:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(13,71,161,.32);background-position:100% 0;}
.btn:active{transform:translateY(0) scale(.98);}
.btn:disabled{opacity:.55;cursor:not-allowed;transform:none;box-shadow:none;}
.btn::after{content:"";position:absolute;top:0;left:-60%;width:40%;height:100%;
  background:linear-gradient(120deg,transparent,rgba(255,255,255,.35),transparent);transform:skewX(-18deg);transition:left .6s var(--ease);}
.btn:hover::after{left:120%;}
.btn.ghost{background:rgba(13,71,161,.08);color:var(--brand-700);box-shadow:none;border-color:rgba(13,71,161,.12);}
.btn.ghost:hover{background:rgba(13,71,161,.14);}
.btn.success{background:linear-gradient(135deg,#16a34a,#22c55e);box-shadow:0 8px 20px rgba(22,163,74,.28);}
.btn.danger{background:linear-gradient(135deg,#e5484d,#f0676b);box-shadow:0 8px 20px rgba(229,72,77,.28);}
.btn.gray{background:linear-gradient(135deg,#475569,#64748b);box-shadow:none;}
.btn.sm{padding:8px 14px;font-size:13px;border-radius:10px;}
.btn.block{width:100%;}
.btn.lg{padding:15px 24px;font-size:16px;border-radius:14px;}

/* ---------- Ô nhập ---------- */
label{display:block;font-size:13px;color:var(--ink-soft);font-weight:600;margin:12px 0 6px;}
.input,input[type=text],input[type=password],input:not([type]){
  width:100%;padding:13px 15px;font:inherit;font-size:15px;color:var(--ink);
  background:#fff;border:1.5px solid var(--line);border-radius:12px;transition:.2s var(--ease);
}
.input:focus,input:focus{outline:0;border-color:var(--brand-300);box-shadow:0 0 0 4px rgba(66,165,245,.15);}
input::placeholder{color:#aab4c4;}

/* ---------- Mảnh nhỏ ---------- */
.badge{font-size:11px;font-weight:700;padding:3px 10px;border-radius:30px;background:rgba(13,71,161,.1);color:var(--brand-700);}
.badge.warn{background:#fff3e0;color:#c2410c;}
.badge.green{background:#dcfce7;color:#15803d;}
.chip{display:inline-flex;align-items:center;gap:7px;background:#f4f7fc;border:1px solid var(--line);
  border-radius:30px;padding:6px 13px;font-size:13px;font-weight:500;}
.dot{width:9px;height:9px;border-radius:50%;background:#cbd5e1;flex:0 0 auto;}
.dot.on{background:var(--success);box-shadow:0 0 0 3px rgba(22,163,74,.18);}
.warnbox{background:#fffbeb;border:1px solid #fde68a;color:#92600a;font-size:13px;padding:11px 14px;border-radius:12px;margin-top:12px;}
.spin{display:inline-block;width:16px;height:16px;border:3px solid rgba(255,255,255,.4);border-top-color:#fff;border-radius:50%;animation:sp .8s linear infinite;vertical-align:-3px;}
.spin.dark{border-color:#cdd;border-top-color:var(--brand-700);}
@keyframes sp{to{transform:rotate(360deg);}}

/* ---------- Tiện ích ---------- */
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;}
.hidden{display:none !important;}
.center{text-align:center;}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;transition-duration:.001ms !important;}
}