/* Style dùng chung cho mọi trang. Cắt nguyên khối từ site/index.html, không sửa byte nào.
Thứ tự nạp bắt buộc: base.css TRƯỚC landing.css/docs.css để override còn thắng.
Khối prefers-reduced-motion và cả 3 @keyframes để nguyên ở đây (kể cả rule .mock
chỉ landing dùng) — xé ra sẽ phải nhân bản wrapper @media, rủi ro hơn lợi ích. */
/* ---------- tokens ---------- */
:root{
--bg:#0F0F12; --bg-2:#1C1C1E; --surface:#232327; --surface-hi:#2E2E33; --border:#3A3A3F;
--text:#F2F2F7; --text-2:#A1A1A8; --text-3:#6E6E76;
--indigo:#6B5CFA; --violet:#AE51F0; --red:#FF453A; --green:#30D158;
--grad:linear-gradient(135deg,var(--indigo),var(--violet));
--font:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text",Inter,system-ui,sans-serif;
--mono:"SF Mono",ui-monospace,Menlo,Consolas,monospace;
--r-lg:20px; --r-md:14px; --r-sm:8px;
--space:clamp(4rem,3rem + 5vw,8rem);
--ease:cubic-bezier(.16,1,.3,1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);line-height:1.55;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit}
img{max-width:100%;display:block}
.wrap{width:min(1120px,92vw);margin:0 auto}
[hidden]{display:none!important}
/* ---------- atmosphere ---------- */
.glow{position:fixed;inset:0;pointer-events:none;z-index:0;
background:
radial-gradient(60vw 40vw at 15% -10%,rgba(107,92,250,.28),transparent 60%),
radial-gradient(50vw 35vw at 95% 10%,rgba(174,81,240,.22),transparent 60%),
radial-gradient(40vw 30vw at 50% 110%,rgba(107,92,250,.12),transparent 60%);}
.grain{position:fixed;inset:0;pointer-events:none;z-index:0;opacity:.05;mix-blend-mode:overlay;
background-image:url("data:image/svg+xml;utf8,")}
main,header,footer{position:relative;z-index:1}
/* ---------- top bar ---------- */
.top{display:flex;align-items:center;justify-content:space-between;padding:20px 0}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:-.01em;text-decoration:none}
.brand img{width:28px;height:28px;border-radius:7px}
.lang{display:inline-flex;border:1px solid var(--border);border-radius:999px;padding:3px;background:rgba(255,255,255,.03)}
.lang button{all:unset;cursor:pointer;font:600 12px/1 var(--font);letter-spacing:.06em;padding:7px 12px;border-radius:999px;color:var(--text-2);transition:background .2s,color .2s}
.lang button[aria-pressed="true"]{background:var(--surface-hi);color:var(--text)}
.lang button:focus-visible{outline:2px solid var(--indigo);outline-offset:2px}
/* ---------- nút tải (dùng ở landing, hub, guide) ---------- */
.btn{display:inline-flex;align-items:center;gap:10px;text-decoration:none;font-weight:700;font-size:1rem;padding:16px 24px;border-radius:14px;background:var(--grad);color:#fff;box-shadow:0 10px 30px -10px rgba(107,92,250,.7),inset 0 1px 0 rgba(255,255,255,.25);transition:transform .25s var(--ease),box-shadow .25s var(--ease)}
.btn:hover{transform:translateY(-2px);box-shadow:0 18px 40px -12px rgba(107,92,250,.85),inset 0 1px 0 rgba(255,255,255,.25)}
.btn:active{transform:translateY(0)}
.btn:focus-visible{outline:2px solid #fff;outline-offset:3px}
.btn svg{width:18px;height:18px}
@media (prefers-reduced-motion:no-preference){
.mock .ph{animation:sweep 9s linear infinite}
.mock .win{animation:zoom 9s var(--ease) infinite}
.reveal{opacity:0;transform:translateY(14px);animation:up .9s var(--ease) forwards}
.reveal:nth-child(2){animation-delay:.08s}.reveal:nth-child(3){animation-delay:.16s}.reveal:nth-child(4){animation-delay:.24s}
.hero .mock{opacity:0;animation:up 1.1s var(--ease) .25s forwards}
}
@keyframes sweep{from{left:8%}to{left:92%}}
@keyframes zoom{0%,15%{transform:scale(1)}30%,60%{transform:scale(1.35)}80%,100%{transform:scale(1)}}
@keyframes up{to{opacity:1;transform:none}}
/* ---------- sections ---------- */
section{padding:var(--space) 0}
.kicker{font:600 12px/1 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--indigo);margin-bottom:14px}
h2{font-size:clamp(1.9rem,1rem + 2.6vw,3rem);letter-spacing:-.03em;line-height:1.08;margin:0 0 14px;font-weight:800}
.sub{color:var(--text-2);max-width:56ch;margin:0 0 42px;font-size:1.05rem}
kbd{font:600 12px/1 var(--mono);color:var(--text);background:var(--surface-hi);border:1px solid var(--border);border-bottom-width:2px;border-radius:6px;padding:7px 9px;white-space:nowrap}
footer{padding:40px 0 60px;color:var(--text-3);font-size:13px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;border-top:1px solid var(--border)}
/* Ghi chú analytics: fine print, xuống dòng riêng dưới các mục còn lại. */
footer .note{flex-basis:100%;font-size:12px;opacity:.7}
/* ---------- nav nhiều trang (mới: trước đây site chỉ có 1 trang) ---------- */
.menu{display:flex;gap:4px;flex-wrap:wrap}
.menu a{font-size:13.5px;font-weight:500;color:var(--text-2);text-decoration:none;padding:8px 11px;border-radius:9px;transition:color .2s,background .2s}
.menu a:hover{color:var(--text);background:rgba(255,255,255,.05)}
.menu a:focus-visible{outline:2px solid var(--indigo);outline-offset:2px}
.menu a[aria-current="page"]{color:var(--text);background:var(--surface-hi)}
/* Nút đổi ngôn ngữ là điều hướng sang URL kia, không còn là