/* ===== Đại Dương Gym — Blog bài viết (khớp landing.html) ===== */
:root{
  --bg:#0c0c0d; --bg2:#141416; --card:#17181b; --line:#26272b;
  --lime:#c6ff1a; --lime-d:#a6d800; --txt:#f4f4f5; --mut:#a1a1aa;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Be Vietnam Pro',system-ui,sans-serif;background:var(--bg);color:var(--txt);line-height:1.75;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{width:100%;max-width:1180px;margin:0 auto;padding:0 20px}
.display{font-family:'Anton',sans-serif;font-weight:400;letter-spacing:.5px;text-transform:uppercase;line-height:1.06}
.lime{color:var(--lime)}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--lime);color:#0c0c0d;font-weight:700;padding:15px 30px;border-radius:6px;border:none;cursor:pointer;text-transform:uppercase;letter-spacing:.6px;font-size:15px;transition:.2s;font-family:'Be Vietnam Pro',sans-serif}
.btn:hover{background:#fff;transform:translateY(-2px)}
.btn-ghost{background:transparent;color:var(--txt);border:2px solid var(--line)}
.btn-ghost:hover{border-color:var(--lime);color:var(--lime)}

/* header */
header{position:fixed;top:0;left:0;right:0;z-index:100;transition:.3s;padding:16px 0;background:rgba(12,12,13,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between}
.logo{font-family:'Anton',sans-serif;font-size:24px;letter-spacing:1px;text-transform:uppercase}
.logo span{color:var(--lime)}
.nav-right{display:flex;gap:22px;align-items:center}
.nav-right a.back{font-weight:500;font-size:15px;color:var(--mut);transition:.2s}
.nav-right a.back:hover{color:var(--lime)}
.nav-right .btn{padding:11px 22px;font-size:13px}

/* article */
.article{padding:130px 0 20px}
.wrap-article{width:100%;max-width:780px;margin:0 auto;padding:0 20px}
.cat{display:inline-block;color:var(--lime);font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:1.5px;margin-bottom:16px}
.article h1{font-family:'Anton',sans-serif;font-weight:400;text-transform:uppercase;font-size:clamp(30px,5.2vw,50px);line-height:1.08;margin-bottom:18px}
.meta-line{color:var(--mut);font-size:14px;border-bottom:1px solid var(--line);padding-bottom:24px;margin-bottom:34px}
.meta-line b{color:var(--lime)}
.article h2{font-size:clamp(22px,3.4vw,30px);font-weight:700;margin:40px 0 14px;line-height:1.3}
.article p{color:#d4d4d8;font-size:17px;margin-bottom:18px}
.article strong{color:#fff}
.article em{color:#e4e4e7}
.article ul{list-style:none;margin:0 0 20px}
.article li{position:relative;padding-left:26px;margin-bottom:12px;color:#d4d4d8;font-size:17px}
.article li::before{content:'›';position:absolute;left:4px;top:-1px;color:var(--lime);font-weight:800;font-size:20px}
.pull{background:var(--card);border-left:3px solid var(--lime);border-radius:0 10px 10px 0;padding:18px 22px;margin:26px 0;color:#e4e4e7;font-size:17px}

/* author box */
.author{display:flex;gap:16px;align-items:flex-start;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:24px;margin:44px 0 30px}
.author .ava{width:56px;height:56px;flex-shrink:0;border-radius:12px;background:rgba(198,255,26,.12);display:flex;align-items:center;justify-content:center;color:var(--lime);font-size:28px}
.author h4{font-size:17px;margin-bottom:6px;font-weight:700}
.author p{font-size:14px;color:var(--mut);margin:0}

/* disclaimer */
.disclaimer{color:#8b8b93;font-size:13.5px;font-style:italic;border-top:1px solid var(--line);padding-top:22px;margin-top:8px;line-height:1.65}

/* cta band */
.band{background:linear-gradient(105deg,rgba(12,12,13,.93),rgba(12,12,13,.55)),url('https://henrykien.com/wp-content/uploads/2026/05/z4110703501700_17bb0ca0403c4dfcf5394c05d60cfb44-4.jpg') center/cover no-repeat;text-align:center;padding:78px 0;margin-top:40px}
.band h2{font-size:clamp(28px,5vw,46px)}
.band p{color:#d4d4d8;margin:14px auto 28px;max-width:560px;font-size:17px}

/* footer mini */
footer{background:#08080a;border-top:1px solid var(--line);padding:40px 0;text-align:center}
footer .logo{font-size:24px;margin-bottom:10px}
footer p,footer a{color:var(--mut);font-size:14px;margin-bottom:6px}
footer a:hover{color:var(--lime)}
.copy{color:#52525b;font-size:13px;margin-top:16px}

@media(max-width:560px){
  .article{padding:110px 0 10px}
  .nav-right a.back{display:none}
}