/* ============================================================
   NÔNG SẢN HỮU TRÍ — style.css (demo web tĩnh 1 trang)
   Palette: xanh lá nông sản + vàng bắp. System fonts (nhanh, offline OK).
   ============================================================ */
:root{
  --g1:#13441a; --g2:#1b5e20; --g3:#2e7d32; --g4:#43a047; --g5:#66bb6a;
  --leaf:#e8f5e9; --leaf2:#f3f9f1; --cream:#fbfdf8;
  --corn:#f6b40a; --corn2:#ffd152; --ink:#1d271a; --muted:#5f6d5c; --line:#dfe8da; --white:#fff;
  --shadow:0 10px 30px rgba(20,60,25,.10); --radius:16px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Segoe UI",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.65;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img,iframe{max-width:100%}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.container{max-width:1140px;margin:0 auto;padding:0 22px}
section{padding:72px 0;scroll-margin-top:74px}
.sec-h{text-align:center;font-size:clamp(24px,4vw,32px);font-weight:800;color:var(--g1);margin-bottom:8px}
.sec-sub{text-align:center;color:var(--muted);font-size:16px;max-width:640px;margin:0 auto 38px}
.tag{display:inline-block;background:var(--leaf);color:var(--g2);font-weight:700;font-size:13px;padding:5px 14px;border-radius:999px;margin-bottom:14px}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:700;border-radius:999px;padding:13px 26px;font-size:15px;cursor:pointer;transition:.2s;border:none;white-space:nowrap}
.btn-corn{background:linear-gradient(135deg,var(--corn),var(--corn2));color:#3a2600;box-shadow:0 6px 18px rgba(246,180,10,.35)}
.btn-corn:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(246,180,10,.45)}
.btn-green{background:var(--g2);color:#fff}
.btn-green:hover{background:var(--g1);transform:translateY(-2px)}
.btn-ghost{background:rgba(255,255,255,.12);color:#fff;border:1.5px solid rgba(255,255,255,.6)}
.btn-ghost:hover{background:rgba(255,255,255,.22)}

/* reveal on scroll */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .6s ease,transform .6s ease}
.reveal.visible{opacity:1;transform:none}

/* ---------- NAV ---------- */
nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;gap:18px;height:66px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--g1);font-size:18px}
.brand img{height:42px;border-radius:9px}
.nav-links{margin-left:auto;display:flex;gap:22px;align-items:center}
.nav-links a:not(.btn){font-weight:600;font-size:15px;color:#34402f;position:relative;padding:4px 0}
.nav-links a:not(.btn):hover{color:var(--g3)}
.nav-links a:not(.btn)::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;background:var(--corn);transition:.25s}
.nav-links a:not(.btn):hover::after{width:100%}
.nav-links .btn{padding:9px 18px;font-size:14px}
.hamb{display:none;margin-left:auto;background:none;border:none;font-size:26px;cursor:pointer;color:var(--g1)}
@media(max-width:880px){
  .hamb{display:block}
  .nav-links{position:fixed;top:66px;right:0;left:0;background:#fff;flex-direction:column;gap:0;border-bottom:1px solid var(--line);
    max-height:0;overflow:hidden;transition:max-height .3s ease;box-shadow:var(--shadow)}
  .nav-links.open{max-height:420px}
  .nav-links a:not(.btn){width:100%;padding:14px 24px;border-bottom:1px solid var(--leaf)}
  .nav-links .btn{margin:14px 24px}
}

/* ---------- HERO ---------- */
.hero{position:relative;min-height:582px;display:flex;align-items:center;color:#fff;overflow:hidden}
.hero-bg{position:absolute;inset:0;background:url('../img/field.jpg') center/cover;animation:zoom 18s ease-in-out infinite alternate}
@keyframes zoom{from{transform:scale(1.02)}to{transform:scale(1.12)}}
.hero-ov{position:absolute;inset:0;background:linear-gradient(115deg,rgba(11,48,18,.93),rgba(20,73,27,.78) 50%,rgba(20,73,27,.42))}
.hero-in{position:relative;z-index:2;max-width:700px;padding:64px 22px;min-width:0;width:100%}
.hero .badge{display:inline-block;background:rgba(246,180,10,.2);border:1px solid rgba(246,180,10,.6);color:var(--corn2);font-weight:700;font-size:13px;padding:7px 15px;border-radius:999px;margin-bottom:20px}
.hero h1{font-size:clamp(28px,5.2vw,50px);line-height:1.12;font-weight:800;letter-spacing:.2px;overflow-wrap:break-word}
.hero p{overflow-wrap:break-word}
.hero h1 span{color:var(--corn2)}
.hero p{font-size:clamp(16px,2.4vw,19px);opacity:.96;margin:20px 0 30px;max-width:580px}
.hero .cta{display:flex;gap:14px;flex-wrap:wrap}
.hero .scroll-hint{position:absolute;bottom:22px;left:50%;transform:translateX(-50%);color:rgba(255,255,255,.8);font-size:13px;z-index:2;animation:bob 1.8s infinite}
@keyframes bob{0%,100%{transform:translate(-50%,0)}50%{transform:translate(-50%,8px)}}
@media(max-width:480px){.hero h1{font-size:26px;line-height:1.18}.hero .badge{font-size:11px;padding:6px 12px}.hero p{font-size:15px}.hero-in{padding:48px 18px}}

/* ---------- STATS ---------- */
.stats{background:var(--g1);color:#fff}
.stats .row{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;padding:30px 22px}
.stat{text-align:center;padding:8px}
.stat b{display:block;font-size:clamp(26px,4vw,38px);color:var(--corn2);font-weight:800;line-height:1}
.stat small{opacity:.9;font-size:13.5px;display:block;margin-top:6px}
@media(max-width:760px){.stats .row{grid-template-columns:repeat(2,1fr);gap:22px}}

/* ---------- WHY ---------- */
.why{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 22px;text-align:center;transition:.25s}
.card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:var(--g5)}
.card .ic{width:60px;height:60px;margin:0 auto 16px;border-radius:16px;background:var(--leaf);display:flex;align-items:center;justify-content:center;font-size:28px}
.card h3{color:var(--g2);font-size:17px;margin-bottom:7px}
.card p{color:var(--muted);font-size:14px}
@media(max-width:880px){.why{grid-template-columns:repeat(2,1fr)}}

/* ---------- CHAIN (chuỗi khép kín) ---------- */
.chain{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.cstep{position:relative;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.cstep img{width:100%;height:215px;object-fit:cover}
.cstep .cap{position:absolute;inset:auto 0 0 0;padding:34px 16px 16px;background:linear-gradient(transparent,rgba(9,38,14,.9));color:#fff}
.cstep .cap b{font-size:16px;display:block}
.cstep .cap small{opacity:.88;font-size:12.5px}
.cstep .n{position:absolute;top:12px;left:12px;width:34px;height:34px;border-radius:50%;background:var(--corn);color:#3a2600;font-weight:800;display:flex;align-items:center;justify-content:center;box-shadow:0 3px 8px rgba(0,0,0,.3)}
@media(max-width:880px){.chain{grid-template-columns:repeat(2,1fr)}}

/* ---------- PRODUCTS ---------- */
.prods{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.prod{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.25s}
.prod:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.prod .pimg{height:165px;overflow:hidden;background:var(--leaf)}
.prod .pimg img{width:100%;height:100%;object-fit:cover;transition:.4s}
.prod:hover .pimg img{transform:scale(1.06)}
.prod .pph{height:165px;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#9bb293;background:radial-gradient(circle at 50% 40%,#f4faf2,#e6f1e3);font-size:34px}
.prod .pph small{font-size:11px;font-weight:600;margin-top:4px}
.prod .pb{padding:14px 16px 18px}
.prod .pb h4{color:var(--g1);font-size:15px;line-height:1.32;min-height:40px}
.prod .pb .spec{display:inline-block;margin-top:8px;background:var(--leaf);color:var(--g2);font-size:12px;font-weight:700;padding:3px 11px;border-radius:999px}
@media(max-width:960px){.prods{grid-template-columns:repeat(2,1fr)}}

/* ---------- OEM ---------- */
.oem-wrap{background:linear-gradient(135deg,var(--g1),var(--g3));border-radius:24px;overflow:hidden;display:grid;grid-template-columns:1.05fr .95fr;color:#fff;box-shadow:var(--shadow)}
.oem-txt{padding:50px 46px}
.oem-txt h2{font-size:clamp(24px,3.6vw,30px);margin:14px 0 14px;font-weight:800}
.oem-txt ul{list-style:none;margin:18px 0 28px}
.oem-txt li{padding:8px 0 8px 30px;position:relative;opacity:.97}
.oem-txt li::before{content:"✓";position:absolute;left:0;color:var(--corn2);font-weight:900}
.oem-pic{background:url('../img/sp5-cob.jpg') center/cover;min-height:300px}
@media(max-width:860px){.oem-wrap{grid-template-columns:1fr}.oem-pic{min-height:240px;order:-1}}

/* ---------- WHOLESALE ---------- */
.ws{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.wcard{border-radius:var(--radius);overflow:hidden;position:relative;box-shadow:var(--shadow)}
.wcard img{width:100%;height:230px;object-fit:cover;transition:.4s}
.wcard:hover img{transform:scale(1.05)}
.wcard span{position:absolute;left:12px;bottom:12px;background:rgba(13,40,15,.78);color:#fff;font-size:13px;font-weight:600;padding:5px 12px;border-radius:999px}
@media(max-width:760px){.ws{grid-template-columns:1fr}}

/* ---------- ABOUT ---------- */
.about{background:var(--leaf2)}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.about-grid .txt h2{font-size:clamp(24px,3.6vw,30px);color:var(--g1);font-weight:800;margin-bottom:14px}
.about-grid .txt p{color:#3c4a38;margin-bottom:12px}
.about-grid .pic{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.about-grid .pic img{width:100%;height:340px;object-fit:cover}
@media(max-width:820px){.about-grid{grid-template-columns:1fr}.about-grid .pic{order:-1}}

/* ---------- CONTACT ---------- */
.contact{background:linear-gradient(135deg,var(--g2),var(--g1));color:#fff}
.contact .sec-h,.contact .sec-sub{color:#fff}
.ct-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.ct-card{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);border-radius:var(--radius);padding:30px}
.ct-card .line{display:flex;gap:14px;align-items:flex-start;padding:13px 0;border-bottom:1px solid rgba(255,255,255,.14)}
.ct-card .line:last-child{border:none}
.ct-card .line .ic{width:44px;height:44px;border-radius:12px;background:rgba(246,180,10,.22);display:flex;align-items:center;justify-content:center;font-size:20px;flex:none}
.ct-card .line b{color:var(--corn2);font-size:14px}
.ct-card .line div{font-size:15px}
.ct-act{display:flex;flex-direction:column;justify-content:center;gap:14px}
.ct-act h2{font-size:clamp(22px,3.4vw,28px);font-weight:800}
.ct-act p{opacity:.92;margin-bottom:6px}
.ct-act .btn{justify-content:center}
@media(max-width:820px){.ct-grid{grid-template-columns:1fr}}
.map{margin-top:26px;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);border:3px solid rgba(255,255,255,.18)}
.map iframe{width:100%;height:340px;border:0;display:block}

/* ---------- FOOTER ---------- */
footer{background:#0f3614;color:#bcd6bc;padding:40px 0 26px;font-size:14px}
footer .fco{color:#fff;font-weight:800;font-size:17px;margin-bottom:8px;display:flex;align-items:center;gap:8px}
footer .fb{display:flex;justify-content:space-between;flex-wrap:wrap;gap:14px;border-top:1px solid rgba(255,255,255,.12);margin-top:22px;padding-top:18px;font-size:13px;opacity:.82}

/* ---------- FLOATING + BACK TO TOP ---------- */
.floats{position:fixed;right:18px;bottom:20px;z-index:90;display:flex;flex-direction:column;gap:12px}
.fbtn{width:56px;height:56px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;box-shadow:0 8px 22px rgba(0,0,0,.28);transition:.2s;font-size:13px;text-align:center;line-height:1.05}
.fbtn:hover{transform:scale(1.08)}
.fbtn.zalo{background:#0068ff}
.fbtn.call{background:#2e7d32}
.fbtn.zalo span{font-size:11px}
#toTop{position:fixed;right:20px;bottom:160px;z-index:90;width:46px;height:46px;border-radius:50%;background:var(--corn);color:#3a2600;border:none;font-size:20px;font-weight:900;cursor:pointer;box-shadow:0 6px 16px rgba(0,0,0,.25);opacity:0;pointer-events:none;transition:.25s}
#toTop.show{opacity:1;pointer-events:auto}
@media(max-width:600px){.fbtn{width:50px;height:50px}}

/* ---------- TOAST (báo "đã copy số" trên desktop) ---------- */
.toast{position:fixed;left:50%;bottom:30px;transform:translate(-50%,20px);background:#14441a;color:#fff;font-size:14.5px;font-weight:600;padding:12px 22px;border-radius:999px;box-shadow:0 12px 32px rgba(0,0,0,.32);z-index:200;opacity:0;transition:.3s ease;pointer-events:none;max-width:90vw;text-align:center}
.toast.show{opacity:1;transform:translate(-50%,0)}