/* ============================================================
   Dự án tiêu biểu — case studies
   ============================================================ */

/* ---- Hero ---- */
.cs-hero { position:relative; overflow:hidden; background:linear-gradient(115deg,#0B1B2B 0%,#123859 56%,#1E5C8A 100%); color:#fff; padding:74px 0 70px; }
.cs-hero .deco { position:absolute; border-radius:50%; z-index:1; }
.cs-hero .deco.d1 { width:520px;height:520px;right:-160px;top:-200px;background:rgba(95,199,240,.13); }
.cs-hero .deco.d2 { width:320px;height:320px;left:-120px;bottom:-180px;background:rgba(255,255,255,.05); }
.cs-hero .wrap { position:relative; z-index:2; }
.cs-badge { display:inline-flex; align-items:center; gap:8px; font-size:12.5px; font-weight:800; letter-spacing:.06em; text-transform:uppercase; padding:8px 15px; border-radius:var(--r-pill); background:rgba(255,255,255,.12); border:1px solid rgba(255,255,255,.28); color:#fff; margin-bottom:22px; }
.cs-hero h1 { font-size:clamp(32px,4.4vw,54px); line-height:1.06; letter-spacing:-.025em; max-width:880px; margin-bottom:18px; }
.cs-hero h1 .hl { color:#FF6A3D; }
.cs-hero p { font-size:clamp(16px,1.35vw,19px); color:rgba(255,255,255,.9); max-width:620px; line-height:1.65; margin-bottom:42px; }
.cs-stats { display:flex; gap:48px; flex-wrap:wrap; }
.cs-stats div { display:flex; flex-direction:column; gap:5px; }
.cs-stats b { font-size:38px; font-weight:900; letter-spacing:-.02em; line-height:1; }
.cs-stats b .u { color:#FF6A3D; }
.cs-stats span { font-size:13.5px; color:rgba(255,255,255,.74); font-weight:600; }

/* ---- Partner wall ---- */
.cs-partners { padding:44px 0; background:#fff; border-bottom:1px solid var(--line); }
.cs-partners .lead { text-align:center; font-size:13.5px; font-weight:700; letter-spacing:.08em; text-transform:uppercase; color:var(--muted); margin-bottom:26px; }
.cs-logos { display:grid; grid-template-columns:repeat(6,1fr); gap:16px; }
.cs-logo { height:74px; border:1px solid var(--line); border-radius:var(--r); background:var(--bg-2); display:grid; place-items:center; font-weight:800; font-size:14px; color:var(--muted); text-align:center; padding:0 10px; transition:.18s; }
.cs-logo:hover { color:var(--blue-700); border-color:var(--blue); background:#fff; box-shadow:var(--sh-sm); }

/* ---- Case study blocks ---- */
.cs-case { padding:72px 0; }
.cs-case:nth-child(even) { background:var(--bg-2); }
.cs-case-head { display:flex; align-items:flex-end; gap:20px; flex-wrap:wrap; margin-bottom:30px; }
.cs-num { font-size:54px; font-weight:900; line-height:.8; color:var(--sky); letter-spacing:-.04em; flex:none; -webkit-text-stroke:1px var(--blue); }
.cs-case-head .ht { flex:1; min-width:260px; }
.cs-case-head .tagrow { display:flex; gap:8px; flex-wrap:wrap; margin-bottom:12px; }
.cs-case-head h2 { font-size:clamp(24px,2.7vw,34px); line-height:1.14; letter-spacing:-.02em; }
.cs-meta { display:flex; gap:26px; flex-wrap:wrap; margin-left:auto; }
.cs-meta div { display:flex; flex-direction:column; gap:2px; }
.cs-meta b { font-size:18px; font-weight:800; color:var(--blue-700); line-height:1; }
.cs-meta span { font-size:12px; color:var(--muted); font-weight:600; text-transform:uppercase; letter-spacing:.04em; }

.cs-body { display:grid; grid-template-columns:1.15fr .85fr; gap:34px; align-items:start; }
.cs-cover { border-radius:var(--r-lg); overflow:hidden; position:relative; min-height:340px; }
.cs-cover img { width:100%; height:100%; object-fit:contain; display:block; padding:16px; }
.cs-cover .vbtn { position:absolute; inset:0; display:grid; place-items:center; }
.cs-cover .vbtn span { width:64px; height:64px; border-radius:50%; background:rgba(255,255,255,.94); display:grid; place-items:center; box-shadow:var(--sh-lg); transition:.18s; }
.cs-cover .vbtn span svg { width:24px; height:24px; color:var(--blue-700); margin-left:3px; }
.cs-cover:hover .vbtn span { transform:scale(1.08); }
.cs-cover .vlabel { position:absolute; left:16px; bottom:16px; background:rgba(11,27,43,.74); color:#fff; font-size:12.5px; font-weight:700; padding:7px 13px; border-radius:var(--r-pill); backdrop-filter:blur(3px); }
.cs-story p { font-size:15.5px; color:var(--ink-2); line-height:1.72; margin-bottom:16px; }
.cs-story .res { list-style:none; padding:0; margin:18px 0 0; display:grid; gap:11px; }
.cs-story .res li { display:flex; align-items:flex-start; gap:11px; font-size:15px; font-weight:600; color:var(--ink); line-height:1.45; }
.cs-story .res li svg { width:20px; height:20px; color:var(--green); flex:none; margin-top:1px; }

/* ---- Process timeline ---- */
.cs-flow { margin-top:34px; }
.cs-flow-t { font-size:12.5px; font-weight:800; letter-spacing:.07em; text-transform:uppercase; color:var(--muted); margin-bottom:16px; }
.cs-steps { display:grid; grid-template-columns:repeat(5,1fr); gap:12px; counter-reset:st; }
.cs-step { position:relative; background:#fff; border:1px solid var(--line); border-radius:var(--r); padding:18px 16px; }
.cs-case:nth-child(even) .cs-step { background:#fff; }
.cs-step .si { width:40px; height:40px; border-radius:11px; background:var(--sky); color:var(--blue-600); display:grid; place-items:center; margin-bottom:12px; }
.cs-step .si svg { width:21px; height:21px; }
.cs-step h4 { font-size:14.5px; margin-bottom:5px; }
.cs-step p { font-size:12.5px; color:var(--ink-2); line-height:1.45; }
.cs-step::after { counter-increment:st; content:'0' counter(st); position:absolute; top:14px; right:14px; font-size:13px; font-weight:900; color:var(--line-2,#E3EAF1); }

/* ---- Gallery + testimonial ---- */
.cs-extra { display:grid; grid-template-columns:1.4fr 1fr; gap:24px; margin-top:30px; align-items:stretch; }
.cs-gal { display:grid; grid-template-columns:repeat(3,1fr); grid-template-rows:1fr 1fr; gap:10px; }
.cs-gal .ph { border-radius:var(--r-sm); min-height:118px; }
.cs-gal .ph.big { grid-row:span 2; min-height:auto; }
.cs-gal img { width:100%; height:100%; object-fit:cover; border-radius:var(--r-sm); display:block; }
.cs-gal img.big { grid-row:span 2; }

.cs-fb { background:linear-gradient(155deg,var(--blue) 0%,#0B3A5E 120%); color:#fff; border-radius:var(--r-lg); padding:30px 30px 26px; display:flex; flex-direction:column; box-shadow:var(--sh-blue); }
.cs-fb .qi { width:40px; height:40px; opacity:.4; margin-bottom:12px; }
.cs-fb blockquote { font-size:16.5px; line-height:1.6; font-weight:600; margin:0 0 auto; }
.cs-fb .stars { display:flex; gap:3px; margin:18px 0 14px; color:#FFC24B; }
.cs-fb .stars svg { width:17px; height:17px; fill:#FFC24B; }
.cs-fb .who { display:flex; align-items:center; gap:13px; padding-top:16px; border-top:1px solid rgba(255,255,255,.18); }
.cs-fb .who .av { width:46px; height:46px; border-radius:50%; background:rgba(255,255,255,.16); flex:none; display:grid; place-items:center; font-weight:800; font-size:17px; }
.cs-fb .who b { display:block; font-size:15px; }
.cs-fb .who span { font-size:13px; color:rgba(255,255,255,.74); }

/* ---- Video strip ---- */
.cs-video { padding:78px 0; }
.cs-vgrid { display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.cs-vcard { border-radius:var(--r-lg); overflow:hidden; border:1px solid var(--line); background:#fff; box-shadow:var(--sh-sm); transition:.18s; }
.cs-vcard:hover { transform:translateY(-4px); box-shadow:var(--sh-lg); border-color:transparent; }
.cs-vthumb { position:relative; aspect-ratio:16/9; }
.cs-vthumb .dur { position:absolute; right:12px; bottom:12px; background:rgba(11,27,43,.8); color:#fff; font-size:12px; font-weight:700; padding:4px 9px; border-radius:6px; }
.cs-vbody { padding:18px 20px 22px; }
.cs-vbody h3 { font-size:16.5px; margin-bottom:6px; line-height:1.3; }
.cs-vbody p { font-size:13.5px; color:var(--ink-2); line-height:1.55; }

/* ---- Final CTA ---- */
.cs-final { position:relative; overflow:hidden; background:linear-gradient(120deg,#0B1B2B 0%,#0E3A5E 58%,#0091E6 130%); color:#fff; padding:80px 0; text-align:center; }
.cs-final .deco { position:absolute; width:480px; height:480px; border-radius:50%; background:rgba(95,199,240,.12); right:-120px; top:-160px; z-index:1; }
.cs-final .wrap { position:relative; z-index:2; max-width:820px; }
.cs-final .cs-badge { margin-bottom:22px; }
.cs-final h2 { font-size:clamp(27px,3.3vw,42px); line-height:1.16; letter-spacing:-.02em; margin-bottom:18px; }
.cs-final p { font-size:17px; color:rgba(255,255,255,.86); line-height:1.7; max-width:640px; margin:0 auto 32px; }
.cs-final .btns { display:flex; gap:14px; justify-content:center; flex-wrap:wrap; }
.cs-btn-glass { background:rgba(255,255,255,.1); color:#fff; border:1.5px solid rgba(255,255,255,.32); }
.cs-btn-glass:hover { background:rgba(255,255,255,.18); transform:translateY(-2px); }

/* ---- Responsive ---- */
@media (max-width:1000px) {
  .cs-body { grid-template-columns:1fr; }
  .cs-extra { grid-template-columns:1fr; }
  .cs-steps { grid-template-columns:repeat(3,1fr); }
  .cs-logos { grid-template-columns:repeat(3,1fr); }
  .cs-vgrid { grid-template-columns:1fr 1fr; }
  .cs-meta { margin-left:0; width:100%; }
}
@media (max-width:620px) {
  .cs-steps { grid-template-columns:repeat(2,1fr); }
  .cs-logos { grid-template-columns:repeat(2,1fr); }
  .cs-vgrid { grid-template-columns:1fr; }
  .cs-stats { gap:30px; }
  .cs-gal { grid-template-columns:repeat(2,1fr); }
}