/* Style dùng chung cho trang Chính sách bảo mật & Điều khoản dịch vụ */
:root{
  --bg:#f6f7f9; --panel:#ffffff; --panel-2:#f0f2f5; --line:#dfe3e8;
  --txt:#15181d; --txt-2:#5b6472; --txt-3:#8a93a1;
  --brand:#F83030; --accent:#2f6df6;
  --r:10px; --fs-sm:13px; --fs-md:15px;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0f1216; --panel:#171b21; --panel-2:#1e242c; --line:#2b323c;
    --txt:#e8ecf2; --txt-2:#a3adbb; --txt-3:#6f7a89;
    --brand:#FF4A4A; --accent:#5b8cff;
  }
}
:root[data-theme="dark"]{
  --bg:#0f1216; --panel:#171b21; --panel-2:#1e242c; --line:#2b323c;
  --txt:#e8ecf2; --txt-2:#a3adbb; --txt-3:#6f7a89;
  --brand:#FF4A4A; --accent:#5b8cff;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--txt);
  font:var(--fs-md)/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif;
  -webkit-font-smoothing:antialiased}

header{display:flex;align-items:center;gap:14px;padding:12px 20px;
  border-bottom:1px solid var(--line);background:var(--panel);position:sticky;top:0;z-index:20}
header .brand{display:flex;flex-direction:column;align-items:flex-start;gap:3px;
  text-decoration:none;color:inherit}
header .brand img{height:40px;width:auto;display:block}
header .brand .desc{font-size:var(--fs-sm);color:var(--txt-2);line-height:1.3;padding-left:2px}
header .brand .logo-dark{display:none}
:root[data-theme="dark"] header .brand .logo-light{display:none}
:root[data-theme="dark"] header .brand .logo-dark{display:block}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]) header .brand .logo-light{display:none}
  :root:not([data-theme="light"]) header .brand .logo-dark{display:block}
}
:root[data-theme="light"] header .brand .logo-light{display:block}
:root[data-theme="light"] header .brand .logo-dark{display:none}
header .sp{flex:1}
header a.back{font-size:var(--fs-sm);color:var(--txt-2);text-decoration:none;
  border:1px solid var(--line);border-radius:8px;padding:8px 14px;white-space:nowrap}
header a.back:hover{border-color:var(--brand);color:var(--brand)}

main{max-width:820px;margin:0 auto;padding:36px 20px 56px}
h1{font-family:Montserrat,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-size:32px;font-weight:700;letter-spacing:-.02em;line-height:1.2;margin:0 0 8px}
.updated{color:var(--txt-3);font-size:var(--fs-sm);margin:0 0 28px}
.lead{background:var(--panel);border:1px solid var(--line);border-left:4px solid var(--brand);
  border-radius:var(--r);padding:16px 18px;margin:0 0 32px;color:var(--txt-2)}
.lead b{color:var(--txt)}
h2{font-family:Montserrat,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-size:20px;font-weight:700;letter-spacing:-.01em;line-height:1.3;
  margin:36px 0 12px;display:flex;align-items:center;gap:9px}
h2::before{content:"";width:4px;height:19px;border-radius:2px;background:var(--brand);flex:none}
h3{font-family:Montserrat,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-size:16px;font-weight:700;margin:22px 0 8px}
p{margin:0 0 14px;color:var(--txt-2)}
ul,ol{margin:0 0 14px;padding-left:22px;color:var(--txt-2)}
li{margin-bottom:7px}
li::marker{color:var(--brand)}
strong,b{color:var(--txt);font-weight:600}
a{color:var(--accent)}
a:hover{color:var(--brand)}
.box{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);
  padding:16px 18px;margin:0 0 20px}
.box p:last-child,.box ul:last-child{margin-bottom:0}
table{width:100%;border-collapse:collapse;margin:0 0 18px;font-size:var(--fs-sm)}
th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
th{color:var(--txt);font-weight:650;background:var(--panel-2)}
td{color:var(--txt-2)}
.toc{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:16px 18px;margin:0 0 32px}
.toc b{display:block;margin-bottom:9px;font-size:var(--fs-sm);text-transform:uppercase;
  letter-spacing:.05em;color:var(--txt-3)}
.toc ol{margin:0;padding-left:20px}
.toc li{margin-bottom:5px}
.toc a{text-decoration:none}
.toc a:hover{text-decoration:underline}

/* Footer nền tối cố định ở cả hai giao diện — màu đặt thẳng, không dùng biến theme */
footer{border-top:1px solid #262d36;background:#12161b;padding:22px 20px;
  display:flex;flex-direction:column;align-items:center;gap:8px;text-align:center;
  font-size:var(--fs-sm);color:#aeb6c2;line-height:1.55}
footer a{color:#e8ecf2;text-decoration:none}
footer a:hover{color:#FF5A5A;text-decoration:underline}
footer .sep{color:#59626f;margin:0 9px;user-select:none}
footer b{color:#ffffff;font-weight:600}
@media (max-width:640px){
  main{padding:26px 16px 44px}
  h1{font-size:26px}
  h2{font-size:18px}
  header .brand img{height:32px}
  header .brand .desc{display:none}
}

/* ===== Trang Câu hỏi thường gặp ===== */
.qa-cat{font-family:Montserrat,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-size:20px;font-weight:700;letter-spacing:-.01em;margin:38px 0 14px;
  display:flex;align-items:center;gap:9px}
.qa-cat::before{content:"";width:4px;height:19px;border-radius:2px;background:var(--brand);flex:none}
details.qa{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);
  margin-bottom:10px;overflow:hidden}
details.qa[open]{border-color:var(--brand)}
details.qa summary{cursor:pointer;padding:15px 18px;font-weight:600;color:var(--txt);
  list-style:none;display:flex;align-items:flex-start;gap:11px;line-height:1.45}
details.qa summary::-webkit-details-marker{display:none}
details.qa summary::before{content:"+";color:var(--brand);font-size:19px;line-height:1.2;
  font-weight:700;flex:none;width:14px}
details.qa[open] summary::before{content:"−"}
details.qa summary:hover{color:var(--brand)}
details.qa .ans{padding:0 18px 16px 43px;color:var(--txt-2)}
details.qa .ans p:last-child,details.qa .ans ul:last-child{margin-bottom:0}
.qa-search{width:100%;padding:12px 14px;border-radius:var(--r);border:1px solid var(--line);
  background:var(--panel);color:var(--txt);font:inherit;margin-bottom:26px}
.qa-search:focus{outline:none;border-color:var(--brand)}
.qa-none{color:var(--txt-3);text-align:center;padding:28px 10px;display:none}

/* ---------- Trang Hướng dẫn ---------- */
.step{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);
  padding:18px 20px 18px 58px;margin:0 0 16px;position:relative}
.step::before{content:attr(data-n);position:absolute;left:18px;top:18px;
  width:26px;height:26px;border-radius:50%;background:var(--brand);color:#fff;
  font-size:var(--fs-sm);font-weight:700;display:flex;align-items:center;justify-content:center}
.step h3{margin:0 0 8px}
.step p:last-child,.step ul:last-child,.step figure:last-child{margin-bottom:0}
figure{margin:14px 0 0;background:var(--panel-2);border:1px solid var(--line);
  border-radius:var(--r);padding:14px;overflow-x:auto}
figure svg{display:block;width:100%;height:auto;max-width:100%}
figcaption{font-size:var(--fs-sm);color:var(--txt-3);margin-top:9px;text-align:center}
.tip{border-left:4px solid var(--brand);background:var(--panel);border:1px solid var(--line);
  border-left:4px solid var(--brand);border-radius:var(--r);padding:14px 16px;margin:0 0 18px}
.tip.warn{border-left-color:var(--warn,#d9822b)}
.tip p:last-child,.tip ul:last-child{margin-bottom:0}
kbd{font:600 12px/1 ui-monospace,Menlo,Consolas,monospace;background:var(--panel-2);
  border:1px solid var(--line);border-radius:5px;padding:3px 6px;color:var(--txt);white-space:nowrap}