/* =========================================================
   NTBV — Nuôi Tôm Bền Vững · Trang chủ (static rebuild)
   Bảng màu lấy từ logo NTBV + nhận diện trang gốc
   ========================================================= */

:root{
  --navy:#17235B;        /* navy thương hiệu (từ logo) */
  --navy-deep:#0E1740;   /* navy đậm cho section tối */
  --ink:#22323D;         /* chữ thân */
  --black:#0B1220;       /* tiêu đề */
  --amber:#B45309;       /* nhấn cam đất */
  --amber-bright:#D97706;
  --cream:#F2EEE3;       /* thẻ kem */
  --bg:#ECF0F2;          /* nền caro xám-xanh */
  --muted:#5A6472;
  --line:rgba(11,20,38,.12);
  --line-light:rgba(242,238,227,.18);
  --white:#fff;
  --up:#1E7A46; --down:#C0392B;
  --maxw:1200px;
  --r:14px;
  --font-body:"Open Sans",system-ui,sans-serif;
  --font-head:"Be Vietnam Pro",system-ui,sans-serif;
  --font-mono:"Space Mono","Courier New",monospace;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:88px}
body{
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--bg);
  background-image:
    linear-gradient(rgba(23,35,91,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(23,35,91,.045) 1px,transparent 1px);
  background-size:26px 26px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---------- Logo ---------- */
.brand-mark{display:inline-block;width:52px;height:44px;color:var(--navy)}
.brand-mark svg{width:100%;height:100%;overflow:visible}
.logo-mono{
  font-family:var(--font-head);font-weight:800;font-size:52px;
  letter-spacing:-3px;fill:currentColor;
}
.logo-check{stroke:currentColor;stroke-width:8;fill:none;stroke-linecap:round}

/* ---------- Typography helpers ---------- */
.mono-label{
  font-family:var(--font-mono);font-size:11px;font-weight:700;
  letter-spacing:2.5px;text-transform:uppercase;color:var(--muted);
}
.mono-label.amber{color:var(--amber)}
h1,h2,h3,h4{font-family:var(--font-head);color:var(--black);line-height:1.15;font-weight:700}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;justify-content:center;
  font-family:var(--font-mono);font-weight:700;font-size:13px;letter-spacing:.5px;
  padding:13px 22px;border-radius:999px;border:1.5px solid transparent;cursor:pointer;
  transition:transform .15s ease,box-shadow .15s ease,background .15s ease;text-transform:uppercase;
}
.btn:hover{transform:translateY(-2px)}
.btn-dark{background:var(--black);color:var(--cream)}
.btn-dark:hover{box-shadow:0 10px 24px rgba(11,18,32,.28)}
.btn-ghost{background:transparent;color:var(--black);border-color:var(--black)}
.btn-ghost:hover{background:var(--black);color:var(--cream)}
.btn-ghost-light{background:transparent;color:var(--cream);border-color:var(--line-light)}
.btn-ghost-light:hover{background:rgba(255,255,255,.1)}
.btn-ai{background:var(--amber);color:#fff}
.btn-ai:hover{background:var(--amber-bright);box-shadow:0 10px 24px rgba(180,83,9,.35)}
.btn-block{width:100%}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(236,240,242,.9);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;gap:24px;height:72px}
.brand{display:flex;align-items:center;gap:12px}
.brand-text strong{display:block;font-family:var(--font-head);font-weight:700;color:var(--black);font-size:16px;line-height:1.1}
.brand-text em{font-family:var(--font-mono);font-style:normal;font-size:9.5px;letter-spacing:2px;text-transform:uppercase;color:var(--muted)}
.main-nav{display:flex;gap:22px;margin-left:auto}
.main-nav a{font-size:14.5px;font-weight:600;color:var(--ink);padding:4px 0;border-bottom:2px solid transparent;transition:.15s}
.main-nav a:hover{color:var(--amber);border-color:var(--amber)}
.header-cta{padding:10px 16px;font-size:12px}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px}
.nav-toggle span{width:24px;height:2px;background:var(--black);transition:.2s}

/* ---------- Hero ---------- */
.hero{padding:56px 0 40px}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:start}
.eyebrow{font-family:var(--font-mono);font-size:11px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;color:var(--muted);display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin-bottom:22px}
.eyebrow .dot{width:8px;height:8px;border-radius:50%;background:var(--amber)}
.eyebrow .sep{color:var(--amber)}
.hero h1{font-size:clamp(40px,6vw,76px);font-weight:700;letter-spacing:-2px;margin-bottom:24px}
.hero h1 em{font-style:italic;font-weight:600;color:var(--navy)}
.hero-lead{font-size:17px;max-width:560px;border-left:3px solid var(--amber);padding-left:18px;color:var(--ink);margin-bottom:32px}
.hero-lead strong{color:var(--black)}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:30px}
.stat{border:1px solid var(--line);border-radius:10px;padding:16px 14px;background:rgba(255,255,255,.5)}
.stat .num{font-family:var(--font-head);font-weight:800;font-size:34px;color:var(--black);display:block;line-height:1}
.stat .num i{color:var(--amber);font-style:normal}
.stat .lbl{font-family:var(--font-mono);font-size:9.5px;letter-spacing:1px;text-transform:uppercase;color:var(--muted);display:block;margin-top:8px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}

/* Knowledge base card */
.kb-card{background:var(--cream);border:1px solid var(--line);border-radius:var(--r);padding:28px;box-shadow:14px 14px 0 rgba(180,83,9,.14)}
.kb-title{font-size:26px;margin:10px 0 6px}
.kb-sub{font-size:14px;color:var(--muted);margin-bottom:18px}
.kb-search{display:flex;gap:8px;margin-bottom:16px}
.kb-search input{flex:1;padding:13px 16px;border:1.5px solid var(--line);border-radius:999px;font-family:var(--font-body);font-size:14px;background:#fff}
.kb-search input:focus{outline:none;border-color:var(--amber)}
.kb-tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}
.tag{font-family:var(--font-mono);font-size:12px;padding:7px 12px;border:1px solid var(--line);border-radius:8px;background:#fff;cursor:pointer;transition:.15s;color:var(--ink)}
.tag:hover{background:var(--navy);color:#fff;border-color:var(--navy)}
.kb-hot{padding-top:18px;border-top:1px dashed var(--line);margin-bottom:14px}
.kb-list{list-style:none;display:flex;flex-direction:column;gap:12px}
.kb-list li{display:flex;gap:12px;font-size:14px;font-weight:600;color:var(--black)}
.kb-list li span{font-family:var(--font-mono);color:var(--amber);font-weight:700}

/* ---------- Sections ---------- */
.section{padding:72px 0}
.section-alt{background:rgba(23,35,91,.03)}
.sec-head{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;margin-bottom:40px;padding-bottom:20px;border-bottom:2px solid var(--black)}
.sec-title{font-size:clamp(28px,4vw,44px);font-weight:700;letter-spacing:-1px;max-width:70%}
.sec-no{color:var(--amber);font-family:var(--font-mono);font-size:.55em;vertical-align:middle;margin-right:8px}
.sec-meta{text-align:right;line-height:1.5;white-space:nowrap}
.sec-cta{text-align:center;margin-top:36px}

.grid{display:grid;gap:22px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}

/* Generic cards */
.card{background:var(--cream);border:1px solid var(--line);border-radius:var(--r);padding:26px;display:flex;flex-direction:column;transition:transform .18s ease,box-shadow .18s ease;position:relative;overflow:hidden}
.card:hover{transform:translateY(-4px);box-shadow:0 16px 34px rgba(11,18,32,.12)}
.card h3{font-size:21px;margin:14px 0 10px}
.card h4{font-size:18px;margin:10px 0 8px;color:var(--black)}
.card-desc{font-size:14px;color:var(--muted);flex:1}
.card-ico{font-size:34px;line-height:1}
.card-foot{margin-top:20px;padding-top:14px;border-top:1px dashed var(--line);font-family:var(--font-mono);font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:1px;color:var(--black);display:flex;justify-content:space-between;align-items:center}
.card-foot i{color:var(--amber);font-style:normal;transition:transform .18s}
.card:hover .card-foot i{transform:translateX(5px)}

/* Lead magnets */
.lead-magnets{gap:26px}
.lm-card{display:grid;grid-template-columns:1fr 1.1fr;border-radius:var(--r);overflow:hidden;border:1px solid var(--line);box-shadow:12px 12px 0 rgba(180,83,9,.14)}
.lm-dark{background:var(--navy-deep);color:var(--cream);padding:28px;display:flex;flex-direction:column}
.lm-dark h3{color:#fff;font-size:22px;margin:12px 0}
.lm-meta{font-family:var(--font-mono);font-size:11px;letter-spacing:1.5px;text-transform:uppercase;color:rgba(242,238,227,.7);margin-top:auto}
.lm-badge{align-self:flex-start;margin-top:14px;font-family:var(--font-mono);font-size:11px;font-weight:700;letter-spacing:1px;text-transform:uppercase;background:var(--amber);color:#fff;padding:8px 12px;border-radius:8px}
.lm-cream{background:var(--cream);padding:28px;display:flex;flex-direction:column}
.lm-body{font-size:14px;color:var(--ink);margin:8px 0 16px}
.check{list-style:none;display:flex;flex-direction:column;gap:9px;margin-bottom:22px}
.check li{position:relative;padding-left:26px;font-size:14px;color:var(--ink)}
.check li::before{content:"✓";position:absolute;left:0;top:0;color:var(--amber);font-weight:700}
.check-light li{color:rgba(242,238,227,.92)}
.check-light li::before{color:var(--amber-bright)}

/* Video cards */
.video-card{padding:0}
.thumb{position:relative;aspect-ratio:16/9;background:linear-gradient(135deg,#2a3550,#151d33);display:flex;align-items:center;justify-content:center}
.thumb .play{width:52px;height:52px;border-radius:50%;background:rgba(255,255,255,.9);color:var(--navy-deep);display:flex;align-items:center;justify-content:center;font-size:18px;padding-left:3px}
.tag-file{position:absolute;top:12px;right:12px;font-family:var(--font-mono);font-size:11px;font-weight:700;background:var(--amber);color:#fff;padding:4px 9px;border-radius:6px;letter-spacing:.5px}
.video-body{padding:22px}

/* Price table */
.price-wrap{display:grid;grid-template-columns:1.5fr 1fr;gap:26px;align-items:start}
.price-panel{background:var(--navy-deep);border-radius:var(--r);padding:26px;color:var(--cream)}
.price-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}
.price-top h3{color:#fff;font-size:22px}
.live{font-family:var(--font-mono);font-size:11px;font-weight:700;letter-spacing:1px;color:#fff;display:flex;align-items:center;gap:7px}
.live-dot{width:8px;height:8px;border-radius:50%;background:#38d47a;box-shadow:0 0 0 0 rgba(56,212,122,.7);animation:pulse 1.8s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(56,212,122,.6)}70%{box-shadow:0 0 0 8px rgba(56,212,122,0)}100%{box-shadow:0 0 0 0 rgba(56,212,122,0)}}
.price-regions{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}
.chip{font-family:var(--font-mono);font-size:11px;font-weight:700;padding:7px 12px;border-radius:7px;border:1px solid var(--line-light);background:transparent;color:rgba(242,238,227,.8);cursor:pointer;transition:.15s;text-transform:uppercase;letter-spacing:.5px}
.chip.active,.chip:hover{background:var(--amber);color:#fff;border-color:var(--amber)}
.price-table{width:100%;border-collapse:collapse;font-size:14px}
.price-table th{text-align:left;font-family:var(--font-mono);font-size:10.5px;letter-spacing:1px;text-transform:uppercase;color:rgba(242,238,227,.6);padding:8px 6px;border-bottom:1px solid var(--line-light)}
.price-table td{padding:9px 6px;border-bottom:1px solid rgba(242,238,227,.08)}
.price-table tr.group td{font-family:var(--font-mono);font-size:11px;letter-spacing:1px;text-transform:uppercase;color:var(--amber-bright);padding-top:16px;font-weight:700}
.price-table td:nth-child(3){font-weight:700;color:#fff;font-variant-numeric:tabular-nums}
.up{color:#4ade80}.down{color:#f87171}.flat{color:rgba(242,238,227,.5)}
.price-note{font-family:var(--font-mono);font-size:11px;letter-spacing:.5px;text-transform:uppercase;color:rgba(242,238,227,.6);margin-top:16px}
.price-note a{color:var(--amber-bright)}
.news-panel{display:flex;flex-direction:column;gap:4px}
.news-item{padding:18px 0;border-bottom:1px dashed var(--line)}
.news-item:first-of-type{padding-top:14px}
.news-meta{font-family:var(--font-mono);font-size:10.5px;letter-spacing:1px;text-transform:uppercase;color:var(--muted);margin-bottom:6px}
.news-item h4{font-size:16px;margin-bottom:6px}

/* Dark AI section */
.section-dark{background:var(--navy-deep);color:var(--cream)}
.ai-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.ai-title{color:#fff;font-size:clamp(28px,4vw,44px);letter-spacing:-1px;margin:14px 0 18px}
.ai-lead{font-size:16px;color:rgba(242,238,227,.85);margin-bottom:22px;max-width:480px}
.ai-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:26px}
.chat-mock{background:#0a1130;border:1px solid var(--line-light);border-radius:18px;overflow:hidden;box-shadow:0 24px 60px rgba(0,0,0,.4)}
.chat-head{display:flex;align-items:center;gap:10px;padding:16px 18px;background:rgba(255,255,255,.04);border-bottom:1px solid var(--line-light);font-family:var(--font-mono);font-size:13px;font-weight:700;color:#fff}
.ai-avatar{width:30px;height:30px;border-radius:8px;background:var(--amber);color:#fff;display:flex;align-items:center;justify-content:center;font-size:12px}
.chat-status{margin-left:auto;font-size:10px;font-weight:400;color:rgba(242,238,227,.6);display:flex;align-items:center;gap:6px;letter-spacing:.5px}
.chat-body{padding:22px 18px;display:flex;flex-direction:column;gap:14px}
.bubble{padding:13px 16px;border-radius:14px;font-size:14px;max-width:88%}
.bubble.user{align-self:flex-end;background:var(--navy);color:#fff;border-bottom-right-radius:4px}
.bubble.bot{align-self:flex-start;background:var(--cream);color:var(--ink);border-bottom-left-radius:4px;line-height:1.7}
.bubble.bot strong{color:var(--amber)}

/* Community */
.community{display:grid;grid-template-columns:1fr 1.1fr;gap:40px;align-items:start}
.community-intro h3{font-size:26px;margin-bottom:14px}
.hotline{margin:22px 0;font-family:var(--font-mono);font-size:12px;letter-spacing:1px;text-transform:uppercase;color:var(--muted);line-height:1.8}
.hotline strong{font-size:22px;color:var(--amber);letter-spacing:0}
.community-links{display:flex;flex-direction:column;gap:14px}
.social-card{display:flex;align-items:center;gap:16px;background:var(--cream);border:1px solid var(--line);border-radius:12px;padding:18px 20px;transition:.18s}
.social-card:hover{transform:translateX(5px);box-shadow:0 10px 24px rgba(11,18,32,.1)}
.social-ico{width:44px;height:44px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:20px;color:#fff;flex-shrink:0}
.social-ico.fb{background:#1877f2}.social-ico.yt{background:#ff0000;font-size:15px}.social-ico.zl{background:#0068ff}
.social-card strong{display:block;font-family:var(--font-head);font-size:15px;color:var(--black)}
.social-card small{color:var(--muted);font-size:12.5px}
.social-card i{margin-left:auto;font-style:normal;font-family:var(--font-mono);font-size:12px;font-weight:700;color:var(--amber);text-transform:uppercase;white-space:nowrap}

/* Product cards */
.prod-card .prod-badge{align-self:flex-start;font-family:var(--font-mono);font-size:10.5px;font-weight:700;letter-spacing:1px;text-transform:uppercase;padding:5px 10px;border-radius:6px;background:rgba(23,35,91,.1);color:var(--navy);margin-bottom:6px}
.prod-card .prod-badge.best{background:var(--amber);color:#fff}

/* Newsletter */
.newsletter{background:var(--black);color:var(--cream);padding:52px 0}
.news-inner{display:grid;grid-template-columns:1fr 1fr;gap:26px;align-items:center}
.news-inner h3{color:#fff;font-size:26px;margin-bottom:8px}
.news-inner p{color:rgba(242,238,227,.8);font-size:15px}
.news-form{display:flex;gap:10px}
.news-form input{flex:1;padding:14px 18px;border-radius:999px;border:1.5px solid var(--line-light);background:rgba(255,255,255,.06);color:#fff;font-family:var(--font-body);font-size:14px}
.news-form input::placeholder{color:rgba(242,238,227,.5)}
.news-form input:focus{outline:none;border-color:var(--amber)}
.news-fine{grid-column:1/-1;color:rgba(242,238,227,.5);margin-top:6px}

/* Footer */
.site-footer{background:var(--navy-deep);color:rgba(242,238,227,.8);padding:56px 0 26px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.2fr;gap:36px}
.footer-mark{color:var(--cream);width:64px;height:52px;margin-bottom:6px}
.footer-name{font-family:var(--font-head);font-weight:700;color:#fff;font-size:18px;margin-bottom:10px}
.footer-desc{font-size:13.5px;max-width:320px;margin-bottom:16px}
.footer-legal{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.5px;color:rgba(242,238,227,.55)}
.footer-col h4{color:#fff;font-size:12px;font-family:var(--font-mono);letter-spacing:1.5px;text-transform:uppercase;margin-bottom:16px}
.footer-col a{display:block;font-size:14px;padding:5px 0;color:rgba(242,238,227,.78);transition:.15s}
.footer-col a:hover{color:var(--amber-bright);padding-left:4px}
.footer-addr{font-size:13px;margin-top:12px;color:rgba(242,238,227,.6)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line-light);margin-top:40px;padding-top:22px;font-family:var(--font-mono);font-size:11px;letter-spacing:.5px;color:rgba(242,238,227,.5);text-transform:uppercase}

/* Chat FAB */
.chat-fab{position:fixed;right:22px;bottom:22px;z-index:60;display:flex;align-items:center;gap:9px;background:var(--amber);color:#fff;font-family:var(--font-mono);font-weight:700;font-size:13px;padding:13px 20px;border-radius:999px;box-shadow:0 12px 30px rgba(180,83,9,.4);transition:.18s}
.chat-fab:hover{transform:translateY(-3px);background:var(--amber-bright)}

/* ---------- Responsive ---------- */
@media(max-width:960px){
  .main-nav{position:fixed;inset:72px 0 auto 0;flex-direction:column;background:var(--bg);border-bottom:1px solid var(--line);padding:16px 24px;gap:4px;transform:translateY(-120%);transition:transform .25s ease;box-shadow:0 20px 40px rgba(0,0,0,.1)}
  .main-nav.open{transform:translateY(0)}
  .main-nav a{padding:12px 0;border-bottom:1px solid var(--line)}
  .nav-toggle{display:flex;margin-left:auto}
  .header-cta{display:none}
  .hero-grid,.price-wrap,.ai-grid,.community,.news-inner{grid-template-columns:1fr}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .lm-card{grid-template-columns:1fr}
  .sec-title{max-width:100%}
  .sec-meta{text-align:left}
  .sec-head{flex-direction:column;align-items:flex-start}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:600px){
  .stats{grid-template-columns:1fr 1fr}
  .grid-2,.grid-3{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;gap:8px;text-align:center}
  .chat-fab span:not(.chat-fab-ico){display:none}
  .chat-fab{padding:14px}
  .kb-card{box-shadow:8px 8px 0 rgba(180,83,9,.14)}
}