/* =========================================================
   TÌNH KTS — Thương hiệu cá nhân KTS Nguyễn Hữu Tình
   Design 2026: "Quiet Luxury" — kem · nâu trầm · terracotta
   Editorial, ấm, thoáng. (tổng hợp xu hướng web KTS 2026)
   ========================================================= */

:root{
  /* Neutral — đen, xám, trắng */
  --ink:#1a1a1a;           /* đen mềm */
  --ink-soft:#4a4a4a;
  --muted:#8a8a8a;
  --paper:#fafafa;         /* nền trắng ngà */
  --paper-2:#f0f0f0;
  --paper-3:#e2e2e2;
  --white:#ffffff;
  /* Accents — xám đậm trung tính, không ánh kim */
  --clay:#3d3d3d;
  --clay-deep:#232323;
  --clay-soft:#9c9c9c;
  --sage:#4d4d4d;
  --brass:#3d3d3d;
  /* aliases giữ tương thích class cũ */
  --gold:#3d3d3d;
  --gold-deep:#232323;
  --gold-soft:#9c9c9c;
  --gold-grad:linear-gradient(135deg,#5a5a5a 0%,#3d3d3d 45%,#232323 100%);
  --line:rgba(26,26,26,.14);
  --line-soft:rgba(26,26,26,.08);
  --line-gold:rgba(61,61,61,.3);
  --shadow-sm:0 2px 18px rgba(26,26,26,.06);
  --shadow:0 24px 64px rgba(26,26,26,.12);
  --shadow-lg:0 38px 96px rgba(26,26,26,.18);
  --serif:"Playfair Display",Georgia,serif;
  --sans:"Be Vietnam Pro",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  --wrap:1220px;
  --radius:6px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--sans);color:var(--ink);background:var(--paper);
  line-height:1.75;font-size:16px;font-weight:400;overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none;transition:color .3s var(--ease)}
ul{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}

h1,h2,h3,h4{font-family:var(--serif);font-weight:600;line-height:1.1;letter-spacing:-.005em;color:var(--ink)}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 30px}

/* ---------- Utility ---------- */
.eyebrow{
  font-family:var(--sans);font-size:.7rem;font-weight:600;letter-spacing:.3em;
  text-transform:uppercase;color:var(--clay-deep);display:inline-flex;align-items:center;gap:12px;
}
.eyebrow::before{content:"";width:30px;height:1.5px;background:var(--clay)}
.eyebrow.center{justify-content:center}
.eyebrow.center::after{content:"";width:30px;height:1.5px;background:var(--clay)}

.section{padding:120px 0}
.section-head{max-width:760px;margin:0 auto 66px}
.section-head.left{margin-left:0}
.section-head h2{font-size:clamp(2.3rem,5vw,3.8rem);margin:20px 0 0;letter-spacing:-.02em}
.section-head p{color:var(--muted);margin-top:20px;font-size:1.08rem;line-height:1.7}
.center{text-align:center}

.btn{
  display:inline-flex;align-items:center;gap:10px;font-family:var(--sans);
  font-size:.8rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;
  padding:16px 34px;border-radius:2px;transition:all .35s var(--ease);cursor:pointer;
}
.btn-gold{background:var(--gold-grad);color:var(--ink);font-weight:700}
.btn-gold:hover{filter:brightness(1.08);transform:translateY(-2px);box-shadow:0 16px 38px rgba(124,94,31,.38);color:var(--ink)}
.btn-dark{background:var(--ink);color:#fff;border:1px solid transparent}
.btn-dark:hover{background:#000;transform:translateY(-2px);color:#fff;border-color:var(--line-gold)}
.btn-ghost{border:1px solid var(--ink);color:var(--ink)}
.btn-ghost:hover{background:var(--ink);color:#fff}
.btn-line{border:1px solid var(--clay);color:var(--clay-deep)}
.btn-line:hover{background:var(--gold-grad);border-color:transparent;color:var(--ink)}

/* =========================================================
   HEADER
   ========================================================= */
.site-header{position:fixed;top:0;left:0;right:0;z-index:1000;padding:24px 0;transition:all .4s var(--ease)}
.site-header.scrolled{padding:13px 0;background:rgba(247,245,239,.92);backdrop-filter:blur(16px);box-shadow:0 1px 0 var(--line-gold)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:13px}
.brand-mark{
  width:46px;height:46px;border-radius:50%;background:var(--clay);color:#fff;
  display:grid;place-items:center;font-family:var(--serif);font-size:1.4rem;font-weight:600;flex:0 0 auto;
}
.brand-text{line-height:1.05;display:flex;flex-direction:column}
.brand-text .name{display:block;font-family:var(--serif);font-size:1.4rem;font-weight:600;color:var(--ink)}
.brand-text .sub{display:block;font-size:.57rem;letter-spacing:.22em;text-transform:uppercase;color:var(--muted);font-weight:600;margin-top:2px}
.site-header:not(.scrolled):not(.light-page) .brand-text .name{color:#fff}
.site-header:not(.scrolled):not(.light-page) .brand-text .sub{color:rgba(255,255,255,.72)}
.site-header:not(.scrolled):not(.light-page) .brand-mark{background:rgba(255,255,255,.16);backdrop-filter:blur(6px)}

.main-nav{display:flex;align-items:center;gap:36px}
.main-nav a{font-size:.83rem;font-weight:500;letter-spacing:.03em;color:var(--ink);position:relative;padding:4px 0}
.site-header:not(.scrolled):not(.light-page) .main-nav>a{color:rgba(255,255,255,.92)}
.site-header:not(.scrolled):not(.light-page) .header-cta .btn-line{border-color:rgba(255,255,255,.5);color:#fff}
.main-nav a:not(.btn)::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:1.5px;background:var(--clay);transition:width .3s var(--ease)}
.main-nav a:not(.btn):hover::after{width:100%}
.main-nav a:hover{color:var(--clay-deep)}
.header-cta{display:flex;align-items:center;gap:16px}
.header-phone{font-size:.83rem;font-weight:600;display:flex;align-items:center;gap:7px}
.site-header:not(.scrolled):not(.light-page) .header-phone{color:#fff}

.menu-toggle{display:none;flex-direction:column;gap:5px;width:30px;height:24px;justify-content:center;z-index:1100}
.menu-toggle span{display:block;height:2px;width:100%;background:var(--ink);transition:all .3s var(--ease)}
.site-header:not(.scrolled):not(.light-page) .menu-toggle span{background:#fff}
.menu-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg);background:var(--ink)}
.menu-toggle.open span:nth-child(2){opacity:0}
.menu-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);background:var(--ink)}

/* =========================================================
   HERO
   ========================================================= */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:0}
.hero-slide{position:absolute;inset:0;background-size:cover;background-position:center;opacity:0;transition:opacity 1.6s var(--ease);transform:scale(1.05);animation:kb 9s linear infinite alternate}
.hero-slide.active{opacity:1}
@keyframes kb{to{transform:scale(1.14)}}
.hero-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(20,15,11,.86) 0%,rgba(20,15,11,.6) 46%,rgba(20,15,11,.24) 100%)}
.hero .wrap{position:relative;z-index:2;width:100%}
.hero-inner{max-width:820px;color:#fff;padding:130px 0 60px}
.hero .eyebrow{color:var(--clay-soft)}
.hero .eyebrow::before{background:var(--clay-soft)}
.hero h1{color:#fff;font-size:clamp(3rem,7vw,6rem);font-weight:600;margin:28px 0 26px;line-height:1.02;letter-spacing:-.02em}
.hero h1 em{font-style:italic;color:var(--clay-soft);font-weight:500}
.hero-lead{font-size:1.2rem;color:rgba(255,255,255,.87);max-width:610px;font-weight:300;line-height:1.8}
.hero-actions{display:flex;gap:18px;margin-top:44px;flex-wrap:wrap}
.hero-stats{display:flex;gap:56px;margin-top:66px;flex-wrap:wrap}
.hero-stats .st .n{font-family:var(--serif);font-size:3rem;font-weight:600;color:#fff;line-height:1}
.hero-stats .st .n span{color:var(--clay-soft)}
.hero-stats .st .l{font-size:.76rem;letter-spacing:.12em;text-transform:uppercase;color:rgba(255,255,255,.72);margin-top:8px}
.hero-dots{position:absolute;bottom:40px;left:50%;transform:translateX(-50%);z-index:3;display:flex;gap:12px}
.hero-dots button{width:34px;height:3px;background:rgba(255,255,255,.32);transition:background .3s}
.hero-dots button.active{background:var(--clay-soft)}

/* =========================================================
   ABOUT strip
   ========================================================= */
.about-split{display:grid;grid-template-columns:0.9fr 1.1fr;gap:76px;align-items:center}
.about-visual{position:relative}
.about-visual img{width:100%;height:620px;object-fit:cover;border-radius:4px;box-shadow:var(--shadow)}
.about-badge{position:absolute;bottom:-28px;right:-28px;background:var(--gold-grad);color:var(--ink);padding:26px 32px;border-radius:4px;box-shadow:var(--shadow-lg);text-align:center}
.about-badge .n{font-family:var(--serif);font-size:2.6rem;line-height:1}
.about-badge .l{font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;margin-top:6px;color:rgba(14,15,18,.72)}
.about-visual .sig{position:absolute;top:26px;left:26px;font-family:var(--serif);font-style:italic;font-size:1.6rem;color:#fff;text-shadow:0 2px 14px rgba(0,0,0,.45)}
.about-body h2{font-size:clamp(2.1rem,4.2vw,3.2rem);margin:20px 0 24px;letter-spacing:-.02em}
.about-body p{color:var(--ink-soft);margin-bottom:18px;font-size:1.05rem}
.about-body .quote{border-left:3px solid var(--clay);padding:8px 0 8px 26px;margin:30px 0;font-family:var(--serif);font-style:italic;font-size:1.5rem;color:var(--ink);line-height:1.4}
.about-facts{display:flex;gap:44px;margin:32px 0 36px;flex-wrap:wrap}
.about-facts .f .n{font-family:var(--serif);font-size:2.3rem;color:var(--clay-deep);font-weight:600}
.about-facts .f .l{font-size:.82rem;color:var(--muted)}

/* =========================================================
   SERVICES
   ========================================================= */
.services{background:var(--ink);color:#fff}
.services .eyebrow{color:var(--clay-soft)}
.services .eyebrow::after,.services .eyebrow::before{background:var(--clay-soft)}
.services .section-head h2{color:#fff}
.services .section-head p{color:rgba(255,255,255,.66)}
.svc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:rgba(255,255,255,.09);border:1px solid rgba(255,255,255,.09)}
.svc{background:var(--ink);padding:46px 34px;transition:background .4s var(--ease);position:relative}
.svc:hover{background:#252019}
.svc .ic{width:52px;height:52px;color:var(--clay-soft);margin-bottom:28px}
.svc .ic svg{width:100%;height:100%}
.svc h3{color:#fff;font-size:1.55rem;margin-bottom:14px}
.svc p{color:rgba(255,255,255,.64);font-size:.94rem;margin-bottom:20px}
.svc .price{font-size:.86rem;color:var(--clay-soft);font-weight:600}
.svc .num{position:absolute;top:30px;right:32px;font-family:var(--serif);font-size:1.05rem;color:rgba(255,255,255,.22)}

/* =========================================================
   PROCESS / QUY TRÌNH  (mới)
   ========================================================= */
.proc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:6px;overflow:hidden}
.proc-step{background:var(--white);padding:44px 36px;position:relative;transition:background .35s var(--ease)}
.proc-step:hover{background:var(--paper-2)}
.proc-step .pn{font-family:var(--serif);font-size:3.2rem;font-weight:600;color:var(--clay-soft);line-height:1;margin-bottom:16px}
.proc-step h3{font-size:1.4rem;margin-bottom:10px}
.proc-step p{color:var(--ink-soft);font-size:.96rem}
.proc-step .dur{margin-top:14px;font-size:.76rem;letter-spacing:.1em;text-transform:uppercase;color:var(--clay-deep);font-weight:600}

/* =========================================================
   PROMISE / cam kết  (mới)
   ========================================================= */
.promise-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:28px}
.promise{text-align:center;padding:10px}
.promise .pic{width:66px;height:66px;margin:0 auto 20px;border-radius:50%;background:var(--paper-2);display:grid;place-items:center;color:var(--clay-deep)}
.promise .pic svg{width:30px;height:30px}
.promise h3{font-size:1.25rem;margin-bottom:8px}
.promise p{color:var(--ink-soft);font-size:.92rem}

/* =========================================================
   BẢNG GIÁ  (mới)
   ========================================================= */
.price-table{max-width:940px;margin:0 auto;background:var(--white);border:1px solid var(--line);border-radius:8px;overflow:hidden;box-shadow:var(--shadow-sm)}
.price-row{display:grid;grid-template-columns:1.5fr 1fr;gap:20px;padding:24px 34px;border-bottom:1px solid var(--line-soft);align-items:center}
.price-row:last-child{border-bottom:none}
.price-row.head{background:var(--ink);padding:20px 34px}
.price-row.head .pi,.price-row.head .pv{color:#fff;font-family:var(--sans);font-size:.74rem;letter-spacing:.16em;text-transform:uppercase;font-weight:700}
.price-row .pi{font-weight:500;color:var(--ink);font-size:1.02rem}
.price-row .pi small{display:block;color:var(--muted);font-weight:400;font-size:.82rem;margin-top:2px}
.price-row .pv{font-family:var(--serif);font-size:1.2rem;color:var(--clay-deep);font-weight:600;text-align:right}
.price-row.hot{background:var(--paper-2);box-shadow:inset 3px 0 0 var(--clay)}
.price-row.hot .pv{color:var(--clay-deep);font-size:1.35rem}
.price-note{text-align:center;margin-top:24px;color:var(--muted);font-size:.94rem;max-width:820px;margin-left:auto;margin-right:auto}

/* =========================================================
   PROJECTS
   ========================================================= */
.proj-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.proj{position:relative;overflow:hidden;border-radius:4px;cursor:pointer;background:var(--ink)}
.proj img{width:100%;height:350px;object-fit:cover;transition:transform .8s var(--ease),opacity .5s}
.proj:hover img{transform:scale(1.08);opacity:.72}
.proj-cap{position:absolute;left:0;right:0;bottom:0;padding:28px;background:linear-gradient(0deg,rgba(20,15,11,.88),transparent);color:#fff;transform:translateY(14px);opacity:.95;transition:all .45s var(--ease)}
.proj:hover .proj-cap{transform:translateY(0)}
.proj-cap .t{font-family:var(--serif);font-size:1.45rem}
.proj-cap .m{font-size:.74rem;letter-spacing:.16em;text-transform:uppercase;color:var(--clay-soft);margin-bottom:4px}
.proj.wide{grid-column:span 2}
.proj.wide img{height:350px}

/* =========================================================
   CARDS
   ========================================================= */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:34px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:34px}
.card{background:var(--white);border-radius:6px;overflow:hidden;box-shadow:var(--shadow-sm);transition:transform .45s var(--ease),box-shadow .45s var(--ease),border-color .45s var(--ease);display:flex;flex-direction:column;border:1px solid var(--line-soft)}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--line-gold)}
.card-img{position:relative;overflow:hidden;aspect-ratio:16/10}
.card-img img{width:100%;height:100%;object-fit:cover;transition:transform .7s var(--ease)}
.card:hover .card-img img{transform:scale(1.06)}
.card-tag{position:absolute;top:14px;left:14px;background:rgba(245,239,230,.95);color:var(--clay-deep);font-size:.67rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;padding:6px 13px;border-radius:2px}
.card-body{padding:28px 28px 32px;flex:1;display:flex;flex-direction:column}
.card-meta{font-size:.76rem;color:var(--muted);letter-spacing:.04em;margin-bottom:12px;display:flex;gap:14px;flex-wrap:wrap}
.card-body h3{font-size:1.5rem;line-height:1.22;margin-bottom:12px}
.card-body h3 a:hover{color:var(--clay-deep)}
.card-body p{color:var(--ink-soft);font-size:.95rem;margin-bottom:20px;flex:1}
.card-link{font-size:.77rem;font-weight:600;letter-spacing:.13em;text-transform:uppercase;color:var(--clay-deep);display:inline-flex;align-items:center;gap:8px}
.card-link .arw{transition:transform .3s var(--ease)}
.card:hover .card-link .arw{transform:translateX(6px)}

/* Book card */
.book-card{background:var(--white);border:1px solid var(--line-soft);border-radius:6px;overflow:hidden;display:flex;flex-direction:column;transition:transform .45s var(--ease),box-shadow .45s var(--ease);box-shadow:var(--shadow-sm)}
.book-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.book-cover{position:relative;aspect-ratio:3/4;background:var(--paper-3);overflow:hidden;display:grid;place-items:center;padding:28px}
.book-cover .mock{width:78%;aspect-ratio:3/4.2;border-radius:3px 7px 7px 3px;box-shadow:-6px 10px 28px rgba(20,15,11,.3);background:linear-gradient(135deg,var(--ink),#2a2119);color:#fff;padding:28px 22px;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden}
.book-cover .mock::before{content:"";position:absolute;left:0;top:0;bottom:0;width:7px;background:rgba(255,255,255,.1)}
.book-cover .mock .kt{font-size:.58rem;letter-spacing:.24em;text-transform:uppercase;color:var(--clay-soft)}
.book-cover .mock .bt{font-family:var(--serif);font-size:1.55rem;line-height:1.12}
.book-cover .mock .ba{font-size:.64rem;letter-spacing:.1em;color:rgba(255,255,255,.66);text-transform:uppercase}
.book-cover.c1 .mock{background:linear-gradient(140deg,#33402e,#1c2417)}
.book-cover.c2 .mock{background:linear-gradient(140deg,#5a3320,#2a160d)}
.book-cover.c3 .mock{background:linear-gradient(140deg,#2f3540,#161a22)}
.book-cover.c4 .mock{background:linear-gradient(140deg,#4a2420,#241010)}
.book-ribbon{position:absolute;top:16px;right:-30px;transform:rotate(45deg);background:var(--gold-grad);color:var(--ink);font-size:.61rem;font-weight:700;letter-spacing:.1em;padding:5px 40px;text-transform:uppercase}
.book-info{padding:26px 26px 30px;flex:1;display:flex;flex-direction:column}
.book-info .b-cat{font-size:.69rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:8px}
.book-info h3{font-size:1.4rem;margin-bottom:10px}
.book-info p{font-size:.9rem;color:var(--ink-soft);margin-bottom:18px;flex:1}
.book-price{display:flex;align-items:baseline;gap:10px;margin-bottom:18px}
.book-price .now{font-family:var(--serif);font-size:1.8rem;font-weight:600;color:var(--ink)}
.book-price .now.free{color:var(--clay-deep)}
.book-price .old{font-size:.95rem;color:var(--muted);text-decoration:line-through}
.book-info .btn{justify-content:center;width:100%}

/* Course card */
.course-card{background:var(--white);border:1px solid var(--line-soft);border-radius:6px;overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--shadow-sm);transition:transform .45s var(--ease),box-shadow .45s var(--ease)}
.course-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.course-img{position:relative;aspect-ratio:16/10;overflow:hidden}
.course-img img{width:100%;height:100%;object-fit:cover;transition:transform .7s var(--ease)}
.course-card:hover .course-img img{transform:scale(1.06)}
.course-img .lvl{position:absolute;bottom:14px;left:14px;background:var(--ink);color:#fff;font-size:.67rem;letter-spacing:.1em;text-transform:uppercase;padding:6px 13px;border-radius:2px}
.course-img .badge-soon{position:absolute;top:14px;right:14px;background:var(--clay);color:#fff;font-size:.65rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;padding:6px 13px;border-radius:2px}
.course-body{padding:28px;flex:1;display:flex;flex-direction:column}
.course-body h3{font-size:1.5rem;margin-bottom:12px;line-height:1.2}
.course-body p{font-size:.94rem;color:var(--ink-soft);margin-bottom:18px}
.course-feats{margin-bottom:22px}
.course-feats li{font-size:.9rem;color:var(--ink-soft);padding:8px 0 8px 27px;position:relative;border-bottom:1px solid var(--line-soft)}
.course-feats li:last-child{border-bottom:none}
.course-feats li::before{content:"";position:absolute;left:0;top:14px;width:14px;height:8px;border-left:2px solid var(--clay);border-bottom:2px solid var(--clay);transform:rotate(-45deg)}
.course-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.course-foot .cp{font-family:var(--serif);font-size:1.7rem;font-weight:600;color:var(--ink)}
.course-foot .cp small{font-size:.8rem;color:var(--muted);font-family:var(--sans);font-weight:400}

/* =========================================================
   TESTIMONIALS
   ========================================================= */
.testi{background:var(--paper-2)}
.testi-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.testi-card{background:var(--white);padding:38px 34px;border-radius:6px;box-shadow:var(--shadow-sm);position:relative}
.testi-card .stars{color:var(--clay);letter-spacing:3px;margin-bottom:16px;font-size:.9rem}
.testi-card .qmark{position:absolute;top:22px;right:30px;font-family:var(--serif);font-size:4.2rem;color:var(--paper-3);line-height:1}
.testi-card p{font-size:1rem;color:var(--ink-soft);margin-bottom:22px;position:relative;z-index:1}
.testi-who{display:flex;align-items:center;gap:14px}
.testi-who .av{width:48px;height:48px;border-radius:50%;background:var(--clay);color:#fff;display:grid;place-items:center;font-family:var(--serif);font-size:1.2rem;font-weight:600}
.testi-who .nm{font-weight:600;font-size:.95rem}
.testi-who .rl{font-size:.8rem;color:var(--muted)}

/* =========================================================
   FAQ  (mới)
   ========================================================= */
.faq{max-width:840px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--line);padding:6px 0}
.faq-q{width:100%;text-align:left;display:flex;justify-content:space-between;align-items:center;gap:20px;padding:26px 4px;font-family:var(--serif);font-size:1.3rem;font-weight:600;color:var(--ink);cursor:pointer}
.faq-q .pl{flex:0 0 auto;width:26px;height:26px;position:relative;transition:transform .35s var(--ease)}
.faq-q .pl::before,.faq-q .pl::after{content:"";position:absolute;background:var(--clay);border-radius:2px}
.faq-q .pl::before{left:0;top:50%;width:100%;height:2px;transform:translateY(-50%)}
.faq-q .pl::after{top:0;left:50%;height:100%;width:2px;transform:translateX(-50%);transition:opacity .3s}
.faq-item.open .faq-q .pl::after{opacity:0}
.faq-item.open .faq-q .pl{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .4s var(--ease)}
.faq-a p{color:var(--ink-soft);padding:0 4px 26px;font-size:1rem;line-height:1.75}

/* =========================================================
   CTA band
   ========================================================= */
.cta-band{position:relative;padding:130px 0;color:#fff;text-align:center;overflow:hidden}
.cta-band .cta-bg{position:absolute;inset:0;background-size:cover;background-position:center}
.cta-band .cta-bg::after{content:"";position:absolute;inset:0;background:rgba(20,15,11,.82)}
.cta-band .wrap{position:relative;z-index:2}
.cta-band h2{color:#fff;font-size:clamp(2.4rem,5vw,4rem);margin:22px 0 22px;letter-spacing:-.02em}
.cta-band p{color:rgba(255,255,255,.84);max-width:620px;margin:0 auto 38px;font-size:1.1rem}
.cta-band .eyebrow{color:var(--clay-soft)}
.cta-band .eyebrow::before,.cta-band .eyebrow::after{background:var(--clay-soft)}
.cta-actions{display:flex;gap:18px;justify-content:center;flex-wrap:wrap}

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer{background:var(--ink);color:rgba(255,255,255,.72);padding:86px 0 34px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.3fr;gap:50px;padding-bottom:54px;border-bottom:1px solid rgba(255,255,255,.1)}
.footer-brand .brand-mark{margin-bottom:18px}
.footer-brand p{font-size:.94rem;line-height:1.75;max-width:320px;margin-top:16px}
.footer-col h4{color:#fff;font-family:var(--sans);font-size:.78rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;margin-bottom:22px}
.footer-col ul li{margin-bottom:12px}
.footer-col ul li a{font-size:.92rem;color:rgba(255,255,255,.66)}
.footer-col ul li a:hover{color:var(--clay-soft)}
.footer-contact li{display:flex;gap:12px;font-size:.92rem;margin-bottom:14px;align-items:flex-start}
.footer-contact li svg{width:17px;height:17px;color:var(--clay-soft);flex:0 0 auto;margin-top:3px}
.footer-social{display:flex;gap:12px;margin-top:20px}
.footer-social a{width:38px;height:38px;border:1px solid rgba(255,255,255,.2);border-radius:50%;display:grid;place-items:center;font-size:.78rem;transition:all .3s}
.footer-social a:hover{background:var(--clay);border-color:var(--clay);color:#fff}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;padding-top:26px;font-size:.82rem;color:rgba(255,255,255,.5);flex-wrap:wrap;gap:10px}

/* =========================================================
   PAGE HERO (inner)
   ========================================================= */
.page-hero{position:relative;padding:190px 0 96px;background:var(--ink);color:#fff;overflow:hidden}
.page-hero .ph-bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.3}
.page-hero .ph-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(20,15,11,.68),rgba(20,15,11,.9))}
.page-hero .wrap{position:relative;z-index:2}
.page-hero .eyebrow{color:var(--clay-soft)}
.page-hero .eyebrow::before{background:var(--clay-soft)}
.page-hero h1{color:#fff;font-size:clamp(2.8rem,6vw,4.8rem);margin:22px 0 20px;max-width:920px;letter-spacing:-.02em}
.page-hero p{color:rgba(255,255,255,.82);max-width:640px;font-size:1.12rem}
.crumbs{font-size:.82rem;color:rgba(255,255,255,.6);margin-bottom:8px}
.crumbs a:hover{color:var(--clay-soft)}
.crumbs span{color:var(--clay-soft)}

/* =========================================================
   ABOUT PAGE
   ========================================================= */
.about-hero{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:center}
.about-hero-img{position:relative}
.about-hero-img img{width:100%;height:660px;object-fit:cover;border-radius:4px;box-shadow:var(--shadow)}
.timeline{max-width:840px;margin:0 auto}
.tl-item{display:grid;grid-template-columns:140px 1fr;gap:38px;padding:36px 0;border-bottom:1px solid var(--line);position:relative}
.tl-item:last-child{border-bottom:none}
.tl-year{font-family:var(--serif);font-size:2.1rem;font-weight:600;color:var(--clay-deep)}
.tl-body h3{font-size:1.4rem;margin-bottom:8px}
.tl-body p{color:var(--ink-soft)}
.values-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.value{padding:38px 32px;background:var(--white);border:1px solid var(--line-soft);border-radius:6px}
.value .vn{font-family:var(--serif);font-size:2.6rem;color:var(--clay-soft);line-height:1;margin-bottom:14px;font-weight:600}
.value h3{font-size:1.35rem;margin-bottom:10px}
.value p{color:var(--ink-soft);font-size:.95rem}

/* =========================================================
   BLOG / ARTICLE
   ========================================================= */
.blog-featured{display:grid;grid-template-columns:1.15fr .85fr;gap:0;background:var(--white);border-radius:6px;overflow:hidden;box-shadow:var(--shadow-sm);margin-bottom:60px;border:1px solid var(--line-soft)}
.blog-featured .bf-img{overflow:hidden;min-height:420px}
.blog-featured .bf-img img{width:100%;height:100%;object-fit:cover}
.blog-featured .bf-body{padding:56px 50px;display:flex;flex-direction:column;justify-content:center}
.blog-featured .bf-body h2{font-size:2.4rem;margin:14px 0 18px;line-height:1.14}
.blog-featured .bf-body p{color:var(--ink-soft);margin-bottom:26px}
.blog-toolbar{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:46px;justify-content:center}
.chip{font-size:.8rem;font-weight:500;letter-spacing:.03em;padding:9px 22px;border:1px solid var(--line);border-radius:40px;color:var(--ink-soft);transition:all .3s;cursor:pointer}
.chip:hover,.chip.active{background:var(--ink);color:#fff;border-color:var(--ink)}

.article-wrap{max-width:780px;margin:0 auto;padding:70px 30px 40px}
.article-body{font-size:1.12rem;line-height:1.88;color:var(--ink-soft)}
.article-body h2{font-size:2rem;margin:50px 0 18px;color:var(--ink)}
.article-body h3{font-size:1.45rem;margin:36px 0 14px;color:var(--ink)}
.article-body p{margin-bottom:22px}
.article-body ul,.article-body ol{margin:0 0 24px 22px}
.article-body ul li,.article-body ol li{margin-bottom:11px;padding-left:8px}
.article-body ul li{list-style:none;position:relative;padding-left:26px}
.article-body ul li::before{content:"";position:absolute;left:0;top:12px;width:8px;height:8px;background:var(--clay);border-radius:50%}
.article-body ol{list-style:decimal;margin-left:26px}
.article-body strong{color:var(--ink);font-weight:600}
.article-body blockquote{border-left:3px solid var(--clay);background:var(--paper-2);padding:26px 32px;margin:34px 0;font-family:var(--serif);font-size:1.4rem;font-style:italic;color:var(--ink);border-radius:0 6px 6px 0;line-height:1.4}
.article-body .callout{background:var(--paper-2);border:1px solid var(--line);border-radius:6px;padding:28px 32px;margin:32px 0}
.article-body .callout .ct{font-weight:700;color:var(--clay-deep);font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;margin-bottom:8px;font-family:var(--sans)}
.article-body img{border-radius:6px;margin:34px 0;width:100%}
.article-lead{font-size:1.34rem;line-height:1.7;color:var(--ink);font-family:var(--serif);margin-bottom:36px;font-style:italic}
.article-meta-top{display:flex;gap:20px;color:var(--muted);font-size:.86rem;margin-bottom:10px;flex-wrap:wrap;align-items:center}
.article-share{display:flex;gap:12px;align-items:center;margin:46px 0;padding:24px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.article-share span{font-size:.82rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:600}
.article-share a{width:38px;height:38px;border:1px solid var(--line);border-radius:50%;display:grid;place-items:center;transition:all .3s}
.article-share a:hover{background:var(--ink);color:#fff;border-color:var(--ink)}
.author-box{display:flex;gap:22px;align-items:center;background:var(--white);border:1px solid var(--line-soft);border-radius:6px;padding:32px;margin:42px 0;box-shadow:var(--shadow-sm)}
.author-box img{width:90px;height:90px;border-radius:50%;object-fit:cover;flex:0 0 auto}
.author-box .ab-name{font-family:var(--serif);font-size:1.45rem;color:var(--ink)}
.author-box .ab-role{font-size:.85rem;color:var(--clay-deep);margin-bottom:8px;font-weight:600}
.author-box p{font-size:.94rem;color:var(--ink-soft)}
.toc{background:var(--paper-2);border:1px solid var(--line);border-radius:6px;padding:28px 32px;margin:36px 0}
.toc .tt{font-weight:700;font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;color:var(--clay-deep);margin-bottom:14px}
.toc ol{margin-left:20px;color:var(--ink-soft)}
.toc ol li{margin-bottom:8px}
.toc ol li a:hover{color:var(--clay-deep)}

/* =========================================================
   CONTACT
   ========================================================= */
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:70px;align-items:start}
.contact-info .ci{display:flex;gap:18px;padding:24px 0;border-bottom:1px solid var(--line)}
.contact-info .ci:last-child{border-bottom:none}
.contact-info .ci .ic{width:48px;height:48px;border-radius:50%;background:var(--paper-2);display:grid;place-items:center;flex:0 0 auto;color:var(--clay-deep)}
.contact-info .ci .ic svg{width:20px;height:20px}
.contact-info .ci .lbl{font-size:.75rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:4px}
.contact-info .ci .val{font-size:1.05rem;font-weight:500;color:var(--ink)}
.contact-form{background:var(--white);padding:46px;border-radius:6px;box-shadow:var(--shadow);border:1px solid var(--line-soft)}
.contact-form h3{font-size:1.8rem;margin-bottom:8px}
.contact-form .fsub{color:var(--muted);margin-bottom:26px;font-size:.95rem}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.field{margin-bottom:18px}
.field label{display:block;font-size:.82rem;font-weight:600;margin-bottom:8px;color:var(--ink)}
.field input,.field select,.field textarea{width:100%;padding:14px 16px;border:1px solid var(--line);border-radius:3px;font-family:var(--sans);font-size:.95rem;background:var(--paper);color:var(--ink);transition:border .3s}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--clay)}
.field textarea{resize:vertical;min-height:110px}
.map-embed{border-radius:6px;overflow:hidden;box-shadow:var(--shadow-sm);height:340px;border:1px solid var(--line-soft)}
.map-embed iframe{width:100%;height:100%;border:0}

/* Hashtags trong bài viết */
.hashtags{display:flex;flex-wrap:wrap;gap:9px;margin:28px 0 4px}
.tagchip{font-size:.82rem;font-weight:500;color:var(--clay-deep);background:var(--paper-2);border:1px solid var(--line);padding:6px 14px;border-radius:40px}

/* Reveal */
.reveal{opacity:0;transform:translateY(34px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.1s}
.reveal.d2{transition-delay:.2s}
.reveal.d3{transition-delay:.3s}

/* Floating contact */
.float-contact{position:fixed;right:22px;bottom:22px;z-index:900;display:flex;flex-direction:column;gap:12px}
.float-contact a{width:54px;height:54px;border-radius:50%;display:grid;place-items:center;box-shadow:var(--shadow);color:#fff;font-weight:700;font-size:.7rem;transition:transform .3s}
.float-contact a:hover{transform:scale(1.1)}
.float-contact .zalo{background:#0068ff}
.float-contact .phone{background:#25a244;animation:pulse 2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(37,162,68,.5)}70%{box-shadow:0 0 0 16px rgba(37,162,68,0)}100%{box-shadow:0 0 0 0 rgba(37,162,68,0)}}

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media(max-width:1024px){
  .svc-grid,.proc-grid{grid-template-columns:repeat(2,1fr)}
  .promise-grid{grid-template-columns:repeat(2,1fr);gap:36px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:38px}
  .about-split,.about-hero,.contact-grid{grid-template-columns:1fr;gap:48px}
  .about-visual img,.about-hero-img img{height:480px}
  .blog-featured{grid-template-columns:1fr}
  .blog-featured .bf-img{min-height:300px}
}
@media(max-width:820px){
  .main-nav{position:fixed;top:0;right:0;bottom:0;width:min(80vw,340px);background:var(--paper);flex-direction:column;justify-content:center;gap:26px;padding:60px 40px;transform:translateX(100%);transition:transform .45s var(--ease);box-shadow:-20px 0 60px rgba(0,0,0,.2);z-index:1050}
  .main-nav.open{transform:translateX(0)}
  .main-nav a{color:var(--ink) !important;font-size:1.1rem}
  .site-header:not(.scrolled):not(.light-page) .main-nav>a{color:var(--ink) !important}
  .menu-toggle{display:flex}
  .header-phone{display:none}
  .grid-3,.testi-grid,.proj-grid,.values-grid{grid-template-columns:1fr}
  .grid-2{grid-template-columns:1fr}
  .proj.wide{grid-column:span 1}
  .section{padding:80px 0}
  .hero-stats{gap:34px}
  .about-badge{right:12px;bottom:-20px;padding:18px 22px}
  .form-row{grid-template-columns:1fr}
  .tl-item{grid-template-columns:80px 1fr;gap:20px}
  .footer-grid{grid-template-columns:1fr}
  .blog-featured .bf-body{padding:34px 28px}
}
@media(max-width:560px){
  .wrap{padding:0 20px}
  .hero-actions{flex-direction:column;align-items:stretch}
  .hero-actions .btn{justify-content:center}
  .svc-grid,.proc-grid,.promise-grid{grid-template-columns:1fr}
  .book-cover .mock{width:70%}
}