@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,500;0,600;0,700;1,500&family=Be+Vietnam+Pro:wght@300;400;500;600;700&display=swap');

/* ===================== VIETREGEN — PREMIUM DESIGN SYSTEM ===================== */
:root{
  /* Greens */
  --green-950:#0f2417;
  --green-900:#14311f;
  --green-800:#1c4429;
  --green-700:#2f6b41;
  --green-600:#3a7d4d;
  --green-500:#4f9a63;
  --green-100:#e9efe6;
  --green-50:#f2f6ef;
  /* Accent (ánh kim) */
  --gold:#b98f39;
  --gold-soft:#d9bd7e;
  /* Neutrals */
  --paper:#faf8f3;
  --cream:#f3f1ea;
  --ink:#20291f;
  --muted:#6b7669;
  --line:#e4e6dd;
  --white:#ffffff;
  /* System */
  --radius:18px;
  --radius-sm:12px;
  --shadow-sm:0 1px 2px rgba(20,49,31,.04), 0 3px 10px rgba(20,49,31,.05);
  --shadow:0 18px 40px -18px rgba(20,49,31,.22);
  --shadow-lg:0 40px 80px -28px rgba(20,49,31,.32);
  --ease:cubic-bezier(.2,.7,.2,1);
  --font-body:'Be Vietnam Pro',system-ui,-apple-system,'Segoe UI',Arial,sans-serif;
  --font-display:'Playfair Display',Georgia,'Times New Roman',serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font-body);color:var(--ink);background:var(--paper);line-height:1.7;font-weight:400;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
h1,h2,h3,h4{font-family:var(--font-display);line-height:1.15;color:var(--green-900);font-weight:600;letter-spacing:-.01em}
h1{font-size:clamp(2.3rem,4.8vw,3.7rem);letter-spacing:-.02em}
h2{font-size:clamp(1.8rem,3.2vw,2.6rem);margin-bottom:.4rem}
h3{font-size:1.3rem;font-weight:600}
p{color:var(--ink)}
a{color:var(--green-700);text-decoration:none;transition:color .2s var(--ease)}
img{max-width:100%;display:block}

.container{max-width:1180px;margin:0 auto;padding:0 28px}
.container.narrow{max-width:860px}
section{padding:clamp(64px,9vw,116px) 0}

.eyebrow{display:inline-flex;align-items:center;font-family:var(--font-body);font-size:.76rem;font-weight:600;letter-spacing:.22em;text-transform:uppercase;color:var(--gold);margin-bottom:18px}
.eyebrow::before{content:"";display:inline-block;width:28px;height:1.5px;background:var(--gold-soft);margin-right:12px}
.band-dark .eyebrow,.page-head .eyebrow{color:var(--gold-soft)}

.lead{font-size:clamp(1.05rem,1.6vw,1.2rem);color:var(--muted);max-width:720px;font-weight:400;line-height:1.75}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,var(--green-700),var(--green-800));color:#fff;
  padding:15px 30px;border-radius:999px;font-family:var(--font-body);font-weight:600;font-size:.95rem;letter-spacing:.01em;
  border:1.5px solid transparent;cursor:pointer;transition:transform .25s var(--ease),box-shadow .25s var(--ease),background .25s var(--ease);
  box-shadow:0 10px 24px -10px rgba(20,49,31,.5)}
.btn:hover{transform:translateY(-2px);box-shadow:0 16px 30px -12px rgba(20,49,31,.55);color:#fff}
.btn.ghost{background:transparent;color:var(--green-800);border-color:rgba(47,107,65,.35);box-shadow:none}
.btn.ghost:hover{background:var(--green-700);color:#fff;border-color:var(--green-700)}
.link-more{display:inline-block;margin-top:16px;font-family:var(--font-body);font-weight:600;color:var(--green-700);position:relative}
.link-more::after{content:" →";transition:margin .2s var(--ease)}
.link-more:hover::after{margin-left:4px}
.link-more:hover{color:var(--gold)}

/* Image placeholder — elegant */
.imgph{background:var(--cream);border:1px dashed #c9d0be;border-radius:var(--radius);
  display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--muted);text-align:center;padding:20px;min-height:130px;position:relative;overflow:hidden}
.imgph::after{content:"";position:absolute;inset:0;background:radial-gradient(400px 200px at 30% 0%,rgba(255,255,255,.6),transparent);pointer-events:none}
.imgph .fn{font-family:var(--font-body);font-weight:600;font-size:.9rem;color:var(--green-700);z-index:1}
.imgph .dim{font-size:.8rem;color:var(--muted);margin-top:5px;z-index:1}
.imgph .ico{font-size:1.7rem;margin-bottom:8px;opacity:.55;z-index:1}

/* Header */
header{position:sticky;top:0;z-index:100;background:rgba(250,248,243,.8);backdrop-filter:saturate(140%) blur(14px);border-bottom:1px solid rgba(228,230,221,.7);transition:box-shadow .3s var(--ease),background .3s var(--ease)}
header.vr-scrolled{background:rgba(250,248,243,.94);box-shadow:0 6px 24px -14px rgba(20,49,31,.3)}
.nav{display:flex;align-items:center;justify-content:space-between;height:82px;transition:height .3s var(--ease)}
header.vr-scrolled .nav{height:68px}
.brand .logoph{width:150px;height:46px;min-height:46px;font-size:.68rem}
.menu{display:flex;gap:30px;list-style:none}
.menu a{font-family:var(--font-body);color:var(--ink);font-weight:500;font-size:.93rem;position:relative;padding:6px 0}
.menu a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:1.5px;background:var(--gold);transition:width .25s var(--ease)}
.menu a:hover,.menu a.active{color:var(--green-800)}
.menu a:hover::after,.menu a.active::after{width:100%}
.nav .btn{padding:11px 22px}
@media(max-width:980px){.menu{display:none}}

/* Hero */
.hero{position:relative;background:
  radial-gradient(1100px 520px at 88% -12%, var(--green-100), transparent 60%),
  radial-gradient(700px 400px at 5% 10%, #f6efdd66, transparent 55%),
  linear-gradient(var(--paper),var(--white))}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;padding:clamp(56px,8vw,104px) 0}
.hero h1{color:var(--green-950);margin-bottom:22px}
.hero .lead{margin-bottom:32px}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap}
.hero-img .imgph{min-height:460px;border-radius:24px;box-shadow:var(--shadow)}
@media(max-width:900px){.hero-grid{grid-template-columns:1fr;gap:34px}.hero-img .imgph{min-height:280px}}

/* Page head (bài chi tiết) */
.page-head{background:linear-gradient(135deg,var(--green-950),var(--green-800));color:#e6efe4;padding:clamp(56px,8vw,88px) 0;position:relative;overflow:hidden}
.page-head::before{content:"";position:absolute;inset:0;background:radial-gradient(600px 300px at 85% -20%,rgba(217,189,126,.14),transparent);pointer-events:none}
.page-head h1{color:#fff;max-width:860px;position:relative}
.page-head p{color:#c3d4c4;margin-top:16px;max-width:760px;font-size:1.08rem;position:relative}
.breadcrumb{font-family:var(--font-body);font-size:.82rem;letter-spacing:.04em;color:#9fbaa4;margin-bottom:18px;position:relative}
.breadcrumb a{color:#c3d4c4}
.breadcrumb a:hover{color:#fff}

/* Pillars */
.pillars{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;margin-top:44px}
.pillar{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:38px 30px;text-align:center;transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease);box-shadow:var(--shadow-sm)}
.pillar:hover{box-shadow:var(--shadow);transform:translateY(-6px);border-color:#d3dbc9}
.pillar .iconph{width:88px;height:88px;min-height:88px;margin:0 auto 20px;border-radius:50%;font-size:.66rem;background:var(--green-50)}
@media(max-width:820px){.pillars{grid-template-columns:1fr}}

.band{background:linear-gradient(var(--green-50),var(--paper))}
.band-dark{background:linear-gradient(135deg,var(--green-950),var(--green-800));color:#dbe7dc}
.band-dark h2,.band-dark h3{color:#fff}
.band-dark .lead{color:#bcd0bf}

/* Cycle */
.cycle{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:12px;margin-top:38px}
.cycle .step{background:var(--white);border:1px solid var(--line);border-radius:999px;padding:14px 26px;font-weight:600;color:var(--green-800);box-shadow:var(--shadow-sm);font-size:.96rem}
.cycle .arrow{color:var(--gold);font-size:1.4rem;font-weight:700}

/* Split */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.split.rev .txt{order:2}
@media(max-width:850px){.split{grid-template-columns:1fr;gap:36px}.split.rev .txt{order:0}}

/* Table */
.tbl-wrap{overflow-x:auto;margin-top:30px;border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--line)}
table{border-collapse:collapse;width:100%;min-width:640px;background:var(--white)}
th,td{padding:17px 20px;text-align:left;border-bottom:1px solid var(--line);font-size:.96rem;vertical-align:top}
thead th{background:linear-gradient(135deg,var(--green-800),var(--green-700));color:#fff;font-weight:600;font-family:var(--font-body);letter-spacing:.01em;border-bottom:none}
tbody tr:last-child td{border-bottom:none}
tbody tr{transition:background .2s var(--ease)}
tbody tr:nth-child(even){background:var(--green-50)}
tbody tr:hover{background:#eef3ea}
.col-hl{background:rgba(185,143,57,.09)!important;font-weight:600}
th.col-hl{background:linear-gradient(135deg,var(--green-950),var(--green-800))!important;box-shadow:inset 3px 0 0 var(--gold)}
td.col-hl{box-shadow:inset 3px 0 0 rgba(185,143,57,.5)}
td.num,th.num{text-align:right;white-space:nowrap;font-variant-numeric:tabular-nums}

/* Price */
.price-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px;margin-top:24px}
.price-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .3s var(--ease)}
.price-card:hover{transform:translateY(-4px)}
.price-card h3{background:linear-gradient(135deg,var(--green-800),var(--green-700));color:#fff;padding:18px 22px;font-size:1.1rem;letter-spacing:.02em}
.price-card .body{padding:8px 22px 18px}
.price-card table{min-width:0}
.price-card td,.price-card th{padding:13px 6px}
.price-card .note{font-size:.82rem;color:var(--muted);padding:0 22px 20px;line-height:1.6}

/* Partners */
.logos{display:flex;flex-wrap:wrap;gap:24px;justify-content:center;align-items:center;margin-top:40px}
.logoph{background:var(--white);border:1px solid var(--line);border-radius:var(--radius-sm);width:200px;height:100px;min-height:100px;display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--muted);text-align:center;padding:10px;box-shadow:var(--shadow-sm);transition:transform .3s var(--ease),box-shadow .3s var(--ease);filter:grayscale(.2)}
.logoph:hover{transform:translateY(-4px);box-shadow:var(--shadow);filter:none}
.logoph .fn{font-family:var(--font-body);font-weight:600;font-size:.78rem;color:var(--green-700)}
.logoph .dim{font-size:.7rem;margin-top:3px}
.logoph.primary{border-color:var(--gold-soft);border-width:1.5px;width:236px;height:116px;box-shadow:0 20px 40px -20px rgba(185,143,57,.4)}

/* Cards / blog */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;margin-top:36px}
.card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);transition:transform .3s var(--ease),box-shadow .3s var(--ease)}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.card .thumb .imgph{border:none;border-radius:0;min-height:180px}
.card .c-body{padding:22px 24px 26px}
.card h3{font-size:1.15rem;margin-bottom:10px}
@media(max-width:820px){.cards{grid-template-columns:1fr}}

/* Prose */
.prose{max-width:800px}
.prose h2{font-size:clamp(1.5rem,2.4vw,2rem);margin:44px 0 14px}
.prose h3{font-size:1.3rem;margin:30px 0 10px;font-weight:600}
.prose p{margin-bottom:16px;font-size:1.04rem;color:#33402f}
.prose ul,.prose ol{margin:0 0 18px 22px}
.prose li{margin-bottom:10px;font-size:1.04rem;color:#33402f}
.prose li::marker{color:var(--gold)}
.prose blockquote{border-left:3px solid var(--gold);background:var(--cream);padding:16px 22px;border-radius:0 12px 12px 0;margin:22px 0;color:var(--muted);font-style:italic}
.prose .fig{margin:26px 0}
.prose strong{color:var(--green-900);font-weight:600}
.callout{background:linear-gradient(135deg,var(--green-50),var(--green-100));border:1px solid #d7e0d2;border-left:4px solid var(--gold);border-radius:var(--radius-sm);padding:24px 26px;margin:28px 0}
.callout strong{color:var(--green-900)}
.toc{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:24px 28px;margin-bottom:34px;box-shadow:var(--shadow-sm)}
.toc h4{margin-bottom:12px;font-family:var(--font-display);font-size:1.1rem}
.toc ol{margin-left:20px}
.toc li{margin-bottom:6px}
.toc a{color:var(--green-700)}
.toc a:hover{color:var(--gold)}

/* Stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:36px}
.stat{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;text-align:center;box-shadow:var(--shadow-sm);transition:transform .3s var(--ease),box-shadow .3s var(--ease)}
.stat:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.stat .n{font-family:var(--font-display);font-size:2rem;font-weight:700;color:var(--green-700)}
.stat .l{font-size:.86rem;color:var(--muted);margin-top:6px}
@media(max-width:820px){.stats{grid-template-columns:1fr 1fr}}

/* ===================== CALCULATOR ===================== */
.calc{display:grid;grid-template-columns:.92fr 1.18fr;gap:38px;margin-top:36px;align-items:start}
@media(max-width:900px){.calc{grid-template-columns:1fr}}
.calc-panel{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow);position:sticky;top:100px}
@media(max-width:900px){.calc-panel{position:static}}
.calc-panel h3{margin-bottom:8px;font-family:var(--font-display)}
.ha-value{font-family:var(--font-display);font-size:3rem;font-weight:700;color:var(--green-700);line-height:1}
.ha-value small{font-size:1.05rem;color:var(--muted);font-weight:600;font-family:var(--font-body)}
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:6px;border-radius:6px;background:linear-gradient(90deg,var(--green-600),var(--green-100));margin:18px 0;outline:none}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:26px;height:26px;border-radius:50%;background:var(--green-700);border:3px solid #fff;box-shadow:0 4px 12px rgba(20,49,31,.35);cursor:pointer;transition:transform .15s var(--ease)}
input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.12)}
input[type=range]::-moz-range-thumb{width:26px;height:26px;border-radius:50%;background:var(--green-700);border:3px solid #fff;cursor:pointer}
.range-row{display:flex;align-items:center;gap:12px}
.range-row input[type=number]{width:110px}
input,textarea,select{font-family:var(--font-body);padding:13px 15px;border:1px solid var(--line);border-radius:var(--radius-sm);font-size:.95rem;width:100%;background:var(--white);color:var(--ink);transition:border-color .2s var(--ease),box-shadow .2s var(--ease)}
input:focus,textarea:focus,select:focus{outline:none;border-color:var(--green-500);box-shadow:0 0 0 3px rgba(79,154,99,.15)}
.assump{margin-top:24px;border-top:1px solid var(--line);padding-top:18px}
.assump summary{cursor:pointer;font-weight:600;color:var(--green-700);font-size:.92rem}
.assump-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:16px}
.assump-grid label{font-size:.8rem;color:var(--muted);display:block;margin-bottom:5px}
.result-cards{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.rc{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:22px 24px;box-shadow:var(--shadow-sm)}
.rc .rc-l{font-size:.82rem;color:var(--muted)}
.rc .rc-n{font-family:var(--font-display);font-size:1.6rem;font-weight:700;color:var(--green-900);margin-top:6px}
.rc.hl{background:linear-gradient(135deg,var(--green-800),var(--green-700));border-color:transparent}
.rc.hl .rc-l,.rc.hl .rc-n{color:#fff}
.rc.warn{border-color:rgba(185,143,57,.4)}
.rc.warn .rc-n{color:var(--gold)}
.proj-table{margin-top:24px}
.bars{display:flex;align-items:flex-end;gap:10px;height:180px;margin-top:30px;padding:0 4px}
.bar-col{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;height:100%}
.bar{width:100%;border-radius:8px 8px 0 0;background:linear-gradient(var(--green-500),var(--green-700));transition:height .4s var(--ease)}
.bar.neg{background:linear-gradient(#d59a9a,#c07f7f)}
.bar-lbl{font-size:.72rem;color:var(--muted);margin-top:8px;font-variant-numeric:tabular-nums}
.disclaimer{font-size:.84rem;color:var(--muted);margin-top:22px;line-height:1.7;background:var(--cream);padding:18px 22px;border-radius:var(--radius-sm);border:1px solid var(--line)}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px}
.info li{list-style:none;margin-bottom:15px;padding-left:28px;position:relative}
.info li:before{content:"";position:absolute;left:4px;top:11px;width:7px;height:7px;border-radius:50%;background:var(--gold)}
form{display:grid;gap:15px}
.fill{color:#b23b3b;font-weight:600}
@media(max-width:800px){.contact-grid{grid-template-columns:1fr}}

/* Footer */
footer{background:linear-gradient(var(--green-950),#0c1f13);color:#cfe0d2;padding:64px 0 30px}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px}
footer h4{color:#fff;margin-bottom:16px;font-size:1.05rem;font-family:var(--font-display)}
footer a{color:#cfe0d2}footer a:hover{color:var(--gold-soft)}
footer ul{list-style:none}footer li{margin-bottom:10px}
.foot-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:40px;padding-top:22px;font-size:.85rem;text-align:center;color:#7f9a86;letter-spacing:.03em}
@media(max-width:800px){.foot-grid{grid-template-columns:1fr;gap:28px}}

/* Chips chọn giá */
.field-label{font-size:.85rem;color:var(--muted);display:block;margin-bottom:8px;font-weight:500}
.chips{display:flex;gap:10px;flex-wrap:wrap}
.chip{flex:1;min-width:92px;padding:12px 10px;border:1.5px solid var(--line);background:var(--white);border-radius:var(--radius-sm);
  font-family:var(--font-body);font-weight:600;font-size:.92rem;color:var(--ink);cursor:pointer;text-align:center;transition:all .2s var(--ease)}
.chip:hover{border-color:var(--green-500)}
.chip.active{background:linear-gradient(135deg,var(--green-800),var(--green-700));color:#fff;border-color:transparent;box-shadow:0 8px 18px -8px rgba(20,49,31,.5)}

/* Ô tick chi phí */
.cost-opt{display:flex;align-items:center;gap:10px;padding:11px 14px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--white);margin-bottom:10px;cursor:pointer;font-size:.92rem;transition:border-color .2s var(--ease),background .2s var(--ease)}
.cost-opt:hover{border-color:var(--green-500)}
.cost-opt input{width:18px;height:18px;accent-color:var(--green-700);flex:0 0 auto}
.cost-opt b{margin-left:auto;color:var(--green-800);font-family:var(--font-body)}
.cost-opt.off{opacity:.5}

/* Ảnh thật tự thay ô trống khi tồn tại trong images/ */
.imgph.has-img{min-height:0;padding:0;border:none;background:none!important}
.imgph.has-img::after{display:none}
.imgph.has-img img{width:100%;height:auto;display:block;border-radius:inherit}
/* Logo thật: bỏ hộp trắng, bóng, filter xám của ô placeholder */
.logoph.has-img{filter:none;box-shadow:none;border:none!important;padding:0}
.logoph.has-img:hover{transform:none;box-shadow:none;filter:none}
.brand .logoph.has-img{height:auto}
.brand .logoph.has-img img{width:auto;max-height:46px}

/* Bài viết / tin tức */
.post-card{display:block;color:inherit}
.post-cat{display:inline-block;font-size:.72rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--gold);margin-bottom:8px}
.post-card h3{transition:color .2s var(--ease)}
.post-card:hover h3{color:var(--green-700)}
.post-date{display:block;margin-top:14px;font-size:.82rem;color:var(--muted)}
.post-card .link-more{margin-top:12px}

/* ===================== SCROLL REVEAL (kích hoạt bằng JS) ===================== */
.vr-reveal{opacity:0;transform:translateY(22px);transition:opacity .8s var(--ease),transform .8s var(--ease);will-change:opacity,transform}
.vr-reveal.vr-in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.vr-reveal{opacity:1!important;transform:none!important;transition:none}}