/* SocialKOC – giao diện tối, hướng công nghệ. Hai màu nhấn theo đối tượng: nhà bán (xanh mint), KOC (cam). */
:root{
  --bg:#060a13;--bg2:#0b1120;--glass:#ffffff0a;--edge:#ffffff1c;
  --txt:#edf2f8;--mut:#98a6ba;--gold:#e6c486;
  --seller:#2be0aa;--seller-2:#0fa37a;--koc:#ff7a45;--koc-2:#e2531f;
  --brand:var(--seller);--brand-2:var(--seller-2);
  --r:20px;
  --sans:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --serif:"Fraunces",Georgia,serif;
}
.page-koc{--brand:var(--koc);--brand-2:var(--koc-2)}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:90px;background:var(--bg)}
body{margin:0;font:400 17px/1.65 var(--sans);color:var(--txt);background:var(--bg);-webkit-font-smoothing:antialiased;overflow-x:hidden}
/* Nền: quầng sáng + lưới mảnh */
body::before{content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    radial-gradient(900px 600px at 12% -8%,#2be0aa26,transparent 60%),
    radial-gradient(900px 640px at 96% 6%,#ff7a4524,transparent 60%),
    radial-gradient(1000px 700px at 50% 110%,#3b6bff1f,transparent 60%),
    linear-gradient(180deg,var(--bg),var(--bg2))}
body::after{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background-image:linear-gradient(#ffffff09 1px,transparent 1px),linear-gradient(90deg,#ffffff09 1px,transparent 1px);
  background-size:56px 56px;mask-image:radial-gradient(ellipse 90% 70% at 50% 20%,#000 30%,transparent 85%);-webkit-mask-image:radial-gradient(ellipse 90% 70% at 50% 20%,#000 30%,transparent 85%)}
img,svg{max-width:100%}
a{color:var(--brand)}
h1,h2,h3,h4{line-height:1.14;letter-spacing:-.025em;margin:0;text-wrap:balance}
p{margin:0}
em{font-family:var(--serif);font-style:italic;font-weight:600;letter-spacing:-.01em}
.gs{background:linear-gradient(100deg,#8ff5d3,var(--seller));-webkit-background-clip:text;background-clip:text;color:transparent}
.gk{background:linear-gradient(100deg,#ffc19f,var(--koc));-webkit-background-clip:text;background-clip:text;color:transparent}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:8px}

/* Header */
.top{position:sticky;top:0;z-index:30;background:#060a13cc;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--edge)}
.top .wrap{display:flex;align-items:center;gap:26px;height:72px}
.logo{font-weight:800;font-size:22px;letter-spacing:-.03em;color:#fff;text-decoration:none;display:flex;align-items:center;gap:10px}
.logo i{width:28px;height:28px;border-radius:9px;background:linear-gradient(135deg,var(--seller) 50%,var(--koc) 50%);box-shadow:0 0 22px #2be0aa55;display:block}
.logo b{color:var(--koc)}
.top nav{display:flex;gap:24px;margin-right:auto}
.top nav a{color:var(--mut);text-decoration:none;font-weight:500;font-size:15px;transition:color .15s}
.top nav a:hover{color:#fff}
.tel{display:inline-flex;align-items:center;gap:8px;color:#fff;text-decoration:none;font-weight:700;font-size:15px;white-space:nowrap}
.tel svg{width:17px;height:17px;color:var(--gold);flex:none}
.top .acts{display:flex;gap:8px}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:9px;justify-content:center;padding:15px 26px;border-radius:999px;font:700 16px/1.2 var(--sans);text-decoration:none;border:1px solid transparent;cursor:pointer;transition:transform .18s,box-shadow .18s,filter .18s;white-space:nowrap;color:#04120d}
.btn:hover{transform:translateY(-2px);filter:brightness(1.07)}
.btn svg{width:18px;height:18px;flex:none}
.btn.s{background:linear-gradient(135deg,#7df3cf,var(--seller));box-shadow:0 10px 34px -10px #2be0aaa6}
.btn.k{background:linear-gradient(135deg,#ffb48f,var(--koc));box-shadow:0 10px 34px -10px #ff7a45a6;color:#1c0a03}
.btn.z{background:#0068ff;color:#fff;box-shadow:0 10px 34px -12px #0068ffb3}
.btn.sm{padding:9px 17px;font-size:14px;box-shadow:none}
.btn[disabled]{opacity:.6;cursor:wait;transform:none}

.eyebrow{display:inline-block;font-size:12.5px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--gold);border:1px solid #e6c48645;background:#e6c4860f;padding:7px 15px;border-radius:999px;margin-bottom:24px}

/* Hero */
.hero{padding:84px 0 56px}
.hero .wrap{display:grid;grid-template-columns:1.12fr .88fr;gap:60px;align-items:center}
.hero h1{font-size:clamp(36px,5.2vw,66px);font-weight:800;color:#fff}
.hero h1 span{display:block}
.hero .lead{font-size:19px;color:var(--mut);max-width:550px;margin-top:26px}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:34px}
.ticks{display:flex;flex-wrap:wrap;gap:8px 22px;margin:26px 0 0;font-size:14.5px;color:var(--mut);list-style:none;padding:0}
.ticks li::before{content:"✓";color:var(--seller);font-weight:700;margin-right:8px}

/* Minh họa ghép đôi */
.match{position:relative;min-height:460px}
.match::before{content:"";position:absolute;inset:8% 6%;border-radius:50%;background:conic-gradient(from 120deg,#2be0aa55,#3b6bff33,#ff7a4555,#2be0aa55);filter:blur(64px);opacity:.75}
.mcard{position:absolute;width:min(310px,80%);background:linear-gradient(160deg,#182338f2,#0d1423f2);border:1px solid var(--edge);border-radius:22px;padding:22px;font-size:14px}
.mcard.ms{top:0;left:0;transform:rotate(-3deg);box-shadow:0 30px 60px -20px #000c,inset 0 2px 0 var(--seller)}
.mcard.mk{bottom:0;right:0;transform:rotate(2.5deg);box-shadow:0 30px 60px -20px #000c,inset 0 2px 0 var(--koc)}
.mcard .tag{font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase}
.ms .tag{color:var(--seller)}.mk .tag{color:var(--koc)}
.mcard h4{margin:8px 0 14px;font-size:17px;line-height:1.3;color:#fff}
.mcard dl{margin:0;display:grid;grid-template-columns:auto 1fr;gap:8px 12px}
.mcard dt{color:var(--mut)}.mcard dd{margin:0;font-weight:600;text-align:right;color:#fff}
.who{display:flex;align-items:center;gap:11px;margin:10px 0 14px}
.who b{width:42px;height:42px;border-radius:50%;background:linear-gradient(135deg,#ffb48f,var(--koc));color:#1c0a03;display:grid;place-items:center;font-size:15px}
.who span{font-weight:700;font-size:16px;line-height:1.2;color:#fff}.who small{display:block;font-weight:400;color:var(--mut);font-size:13px}
.mlink{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background:#fff;color:#060a13;padding:11px 20px;border-radius:999px;font-weight:700;font-size:14px;display:flex;gap:9px;align-items:center;z-index:2;white-space:nowrap;box-shadow:0 0 0 6px #ffffff14,0 0 44px #ffffff40}
.mlink::before{content:"";width:9px;height:9px;border-radius:50%;background:var(--seller-2);box-shadow:0 0 0 4px #2be0aa40}
.match small.cap{position:absolute;bottom:-30px;left:0;font-size:12px;color:#6f7d92}
@media(prefers-reduced-motion:no-preference){
  .mcard.ms{animation:fa 7s ease-in-out infinite}.mcard.mk{animation:fb 7s ease-in-out infinite}
  @keyframes fa{50%{transform:rotate(-2deg) translateY(-9px)}}
  @keyframes fb{50%{transform:rotate(1.5deg) translateY(9px)}}
}

/* Dải ngành nghề chạy ngang */
.fields{padding:44px 0 80px}
.fields h2{font-size:14px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--mut);text-align:center;margin-bottom:26px}
.mq{overflow:hidden;mask-image:linear-gradient(90deg,transparent,#000 10%,#000 90%,transparent);-webkit-mask-image:linear-gradient(90deg,transparent,#000 10%,#000 90%,transparent)}
.mq+.mq{margin-top:12px}
.mq div{display:flex;gap:12px;width:max-content;padding-right:12px}
.pill{border:1px solid var(--edge);background:var(--glass);border-radius:999px;padding:10px 20px;font-size:15px;font-weight:500;color:#dbe4ef;white-space:nowrap}
.pill::before{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--seller);margin-right:10px;vertical-align:middle}
.mq.r .pill::before{background:var(--koc)}
@media(prefers-reduced-motion:no-preference){
  .mq div{animation:mq 50s linear infinite}.mq.r div{animation-direction:reverse}
  .mq:hover div{animation-play-state:paused}
  @keyframes mq{to{transform:translateX(-50%)}}
}
@media(prefers-reduced-motion:reduce){.mq div{flex-wrap:wrap;width:auto;justify-content:center}.mq [aria-hidden]{display:none}}

/* Khối nỗi đau */
.pain{padding:104px 0;position:relative}
.pain::before{content:"";position:absolute;left:0;right:0;top:0;height:1px;background:linear-gradient(90deg,transparent,var(--a),transparent);opacity:.5}
.pain.ps{--a:var(--seller)}.pain.pk{--a:var(--koc)}
.pain .wrap{display:grid;grid-template-columns:.8fr 1.2fr;gap:64px;align-items:start}
.pain .side{position:sticky;top:112px}
.pain h2{font-size:clamp(30px,3.7vw,48px);font-weight:800;color:#fff}
.pain .side p{margin:22px 0 30px;font-size:18px;color:var(--mut);max-width:410px}
.rows{display:grid;gap:16px}
.prow{display:grid;grid-template-columns:1fr 1fr;border-radius:var(--r);overflow:hidden;border:1px solid var(--edge);background:var(--glass);transition:border-color .25s,transform .25s}
.prow:hover{border-color:color-mix(in srgb,var(--a) 55%,transparent);transform:translateY(-3px)}
.prow .q{padding:28px;font-family:var(--serif);font-style:italic;font-size:20px;line-height:1.42;color:#d5deea}
.prow .q::before{content:"“";display:block;font-size:56px;line-height:.6;color:var(--a);margin-bottom:8px;font-style:normal}
.prow .a{padding:28px;font-size:15.5px;line-height:1.62;color:#c3cedc;background:linear-gradient(160deg,color-mix(in srgb,var(--a) 14%,transparent),transparent 70%);border-left:1px solid var(--edge)}
.prow .a strong{display:block;font-size:17.5px;margin-bottom:8px;letter-spacing:-.01em;color:#fff}
.prow .a strong::before{content:"→ ";color:var(--a)}

/* Cách hoạt động */
.how{padding:104px 0}
.shead{max-width:660px;margin-bottom:48px}
.shead h2{font-size:clamp(30px,3.7vw,46px);font-weight:800;color:#fff}
.shead p{color:var(--mut);margin-top:14px;font-size:18px}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;counter-reset:s}
.step{background:var(--glass);border:1px solid var(--edge);border-radius:var(--r);padding:32px;counter-increment:s;position:relative;overflow:hidden}
.step::after{content:"";position:absolute;inset:0 0 auto 0;height:2px;background:linear-gradient(90deg,var(--seller),var(--koc))}
.step::before{content:"0" counter(s);font-family:var(--serif);font-style:italic;font-weight:600;font-size:48px;line-height:1;display:block;margin-bottom:20px;background:linear-gradient(120deg,var(--seller),var(--koc));-webkit-background-clip:text;background-clip:text;color:transparent;width:max-content;padding-right:6px}
.step h3{font-size:20px;margin-bottom:10px;color:#fff}.step p{color:var(--mut);font-size:16px}

/* FAQ */
.faq{padding:0 0 104px}
.faq .wrap{max-width:840px}
details{border-top:1px solid var(--edge);padding:22px 0}
details:last-child{border-bottom:1px solid var(--edge)}
summary{cursor:pointer;font-weight:600;font-size:18px;list-style:none;display:flex;justify-content:space-between;gap:16px;color:#fff}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font-size:26px;line-height:1;color:var(--gold);transition:transform .2s}
details[open] summary::after{transform:rotate(45deg)}
details p{color:var(--mut);margin-top:12px;max-width:700px}

/* CTA cuối + liên hệ */
.final{padding:0 0 104px}
.duo{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.duo a{border-radius:28px;padding:46px 42px;color:#fff;text-decoration:none;display:flex;flex-direction:column;gap:14px;min-height:250px;transition:transform .2s,border-color .2s;border:1px solid var(--edge)}
.duo a:hover{transform:translateY(-4px)}
.duo .ds{background:radial-gradient(520px 320px at 0% 0%,#2be0aa3d,transparent 70%),var(--glass)}.duo .ds:hover{border-color:var(--seller)}
.duo .dk{background:radial-gradient(520px 320px at 100% 0%,#ff7a453d,transparent 70%),var(--glass)}.duo .dk:hover{border-color:var(--koc)}
.duo small{font-size:12.5px;font-weight:600;letter-spacing:.14em;text-transform:uppercase}
.ds small,.ds span{color:var(--seller)}.dk small,.dk span{color:var(--koc)}
.duo h3{font-size:clamp(24px,2.7vw,33px);font-weight:800}
.duo span{margin-top:auto;font-weight:700;display:flex;gap:8px;align-items:center}
.duo svg{width:18px;height:18px}
.contact{margin-top:18px;border:1px solid var(--edge);background:var(--glass);border-radius:28px;padding:34px 42px;display:flex;flex-wrap:wrap;gap:28px 40px;align-items:center;justify-content:space-between}
.contact h3{font-size:26px;font-weight:800;color:#fff}
.contact p{color:var(--mut);margin-top:8px;max-width:420px}
.contact .num{display:block;font-size:clamp(28px,3.4vw,40px);font-weight:800;color:#fff;text-decoration:none;letter-spacing:-.02em;margin:14px 0 18px}
.zalo{display:flex;align-items:center;gap:20px}
.zalo img{width:150px;height:150px;border-radius:16px;background:#fff;padding:8px;display:block}
.zalo div{font-size:14.5px;color:var(--mut);max-width:190px}
.zalo b{display:block;color:#fff;font-size:17px;margin-bottom:4px}

footer{border-top:1px solid var(--edge);background:#04070dcc;color:var(--mut);padding:44px 0;font-size:14.5px}
footer{padding:56px 0 28px}
.fgrid{display:grid;grid-template-columns:1.1fr 1.5fr 1.1fr .9fr;gap:36px}
footer h4{font-size:12.5px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--gold);margin-bottom:14px}
footer p{line-height:1.9}
footer .logo{margin-bottom:14px}
footer b{color:#fff;font-weight:600}
footer a{color:#e7edf5;text-decoration:none}
footer a:hover{color:var(--seller)}
.fbot{margin-top:40px;padding-top:22px;border-top:1px solid var(--edge);font-size:13.5px}
@media(max-width:940px){.fgrid{grid-template-columns:1fr 1fr}}
@media(max-width:620px){.fgrid{grid-template-columns:1fr;gap:28px}footer{padding-bottom:90px}}

/* Nút gọi nổi trên điện thoại */
.fab{display:none;position:fixed;right:16px;bottom:16px;z-index:40;width:58px;height:58px;border-radius:50%;background:linear-gradient(135deg,#7df3cf,var(--seller));color:#04120d;place-items:center;box-shadow:0 12px 30px -6px #2be0aa99}
.fab svg{width:26px;height:26px}

@media(prefers-reduced-motion:no-preference){
  .js .rv{opacity:0;transform:translateY(24px);transition:opacity .7s,transform .7s}
  .js .rv.in{opacity:1;transform:none}
}

/* Trang form: thẻ form nền sáng để chữ rõ nhất */
.fpage{padding:60px 0 104px}
.fpage .wrap{display:grid;grid-template-columns:370px 1fr;gap:44px;align-items:start}
.aside{position:sticky;top:100px;border:1px solid var(--edge);border-radius:28px;padding:38px 34px;background:radial-gradient(420px 300px at 0% 0%,color-mix(in srgb,var(--brand) 26%,transparent),transparent 70%),var(--glass)}
.aside h1{font-size:36px;font-weight:800;color:#fff}
.aside>p{margin-top:14px;color:var(--mut);font-size:16.5px}
.aside ol{list-style:none;margin:28px 0 0;padding:26px 0 0;border-top:1px solid var(--edge);display:grid;gap:18px;counter-reset:n}
.aside li{counter-increment:n;display:grid;grid-template-columns:32px 1fr;gap:14px;font-size:15.5px;line-height:1.5;color:#d5deea}
.aside li::before{content:counter(n);width:32px;height:32px;border-radius:50%;border:1px solid var(--brand);color:var(--brand);display:grid;place-items:center;font-weight:700;font-size:14px}
.aside .help{margin-top:28px;padding-top:24px;border-top:1px solid var(--edge);display:flex;gap:16px;align-items:center}
.aside .help img{width:92px;height:92px;border-radius:12px;background:#fff;padding:5px;flex:none}
.aside .help small{display:block;font-size:13px;color:var(--mut)}
.aside .help .tel{font-size:21px}
form{--ink:#0a1220;--ln:#c9d2de;background:#fff;color:var(--ink);border-radius:28px;padding:14px 40px 40px;box-shadow:0 40px 90px -30px #000,0 0 0 1px #ffffff26;counter-reset:fs}
fieldset{border:0;padding:30px 0 34px;margin:0;border-bottom:1px solid #e6ebf1;counter-increment:fs;min-width:0}
legend{float:left;width:100%;font-weight:800;font-size:22px;letter-spacing:-.02em;padding:0;margin-bottom:6px;display:flex;align-items:center;gap:14px;color:var(--ink)}
legend::before{content:"0" counter(fs);font:italic 600 15px var(--serif);width:38px;height:38px;border-radius:12px;background:var(--ink);color:var(--brand);display:grid;place-items:center;flex:none}
legend+*{clear:both}
.hint{color:#55637a;font-size:15.5px;margin:4px 0 16px}
label{display:block;font-weight:600;margin:20px 0 0;font-size:15.5px;color:var(--ink)}
label small{font-weight:400;color:#6a778b;font-size:14px}
.req::after{content:" *";color:var(--koc-2)}
input[type=text],input[type=tel],input[type=email],input[type=url],input[type=number],select,textarea{display:block;width:100%;margin-top:8px;padding:14px 16px;border:1.5px solid var(--ln);border-radius:13px;font:500 16.5px/1.4 var(--sans);background:#f7f9fc;color:var(--ink);transition:border-color .15s,box-shadow .15s,background .15s}
input::placeholder,textarea::placeholder{color:#9aa6b7;font-weight:400}
input:hover,select:hover,textarea:hover{border-color:#8f9db1}
input:focus,select:focus,textarea:focus{outline:0;border-color:var(--brand-2);box-shadow:0 0 0 4px color-mix(in srgb,var(--brand) 28%,transparent);background:#fff}
select{appearance:none;-webkit-appearance:none;padding-right:44px;cursor:pointer;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230a1220' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center;background-size:18px}
textarea{resize:vertical}
.row{display:grid;gap:0 18px;grid-template-columns:1fr 1fr}
.row.ch{grid-template-columns:1.6fr 1fr}
.chips{display:flex;flex-wrap:wrap;gap:9px}
.chips label{margin:0;font-weight:500;font-size:15px;border:1.5px solid var(--ln);border-radius:999px;padding:9px 17px;cursor:pointer;background:#f7f9fc;transition:background .12s,border-color .12s,color .12s;position:relative}
.chips input{position:absolute;opacity:0;width:0;height:0}
.chips label:hover{border-color:var(--ink)}
.chips label:has(input:checked){background:var(--ink);border-color:var(--ink);color:#fff;box-shadow:inset 0 -2px 0 var(--brand)}
.chips label:has(input:checked)::before{content:"✓ ";color:var(--brand);font-weight:700}
.chips label:has(input:focus-visible){outline:2px solid var(--brand-2);outline-offset:2px}
.tip{margin-top:10px;font-size:14.5px;font-weight:600;color:var(--koc-2)}
.consent{display:flex;gap:12px;align-items:flex-start;font-weight:400;font-size:15px;color:#46546a;background:#f2f5f9;padding:18px;border-radius:14px;margin:30px 0 22px}
.consent input{margin-top:3px;width:19px;height:19px;accent-color:var(--brand-2);flex:none}
.consent a{color:var(--brand-2);font-weight:600}
.hp{position:absolute;left:-9999px}
form .btn{width:100%;padding:19px;font-size:17.5px;background:var(--ink);color:#fff;box-shadow:inset 0 -3px 0 var(--brand),0 16px 34px -14px #0a1220a6}
#msg{margin-top:14px;font-weight:600;text-align:center}
#msg:empty{display:none}
.err{color:#b3261e;background:#fdecea;padding:12px;border-radius:12px}
.plain{max-width:780px;margin:0 auto;padding:80px 24px 104px}
.plain h1{font-size:42px;font-weight:800;margin-bottom:22px;color:#fff}
.plain p{margin-bottom:16px;color:#c3cedc}
.thanks{text-align:center;padding-top:120px}
.thanks .ok{width:78px;height:78px;border-radius:50%;background:linear-gradient(135deg,#7df3cf,var(--seller));color:#04120d;display:grid;place-items:center;margin:0 auto 26px;font-size:36px;font-weight:700;box-shadow:0 0 60px #2be0aa66}
.thanks p{margin:0 auto 30px;max-width:460px;color:var(--mut)}

@media(max-width:1100px){.top nav{gap:18px}.top .tel{display:none}}
@media(max-width:940px){
  .top nav{display:none}.top .acts{margin-left:auto}
  .hero{padding-top:48px}
  .hero .wrap,.pain .wrap,.fpage .wrap{grid-template-columns:1fr;gap:40px}
  .match{min-height:420px;max-width:470px}
  .pain,.how{padding:68px 0}.faq,.final{padding-bottom:68px}
  .pain .side,.aside{position:static}
  .steps,.duo{grid-template-columns:1fr}
  .fab{display:grid}
}
@media(max-width:620px){
  body{font-size:16px}
  .wrap{padding:0 18px}
  .top .wrap{gap:10px;height:62px}.logo{font-size:19px}.logo i{width:23px;height:23px}
  .btn.sm{padding:8px 13px;font-size:13px}
  .cta .btn{width:100%}
  .prow{grid-template-columns:1fr}
  .prow .q,.prow .a{padding:22px}.prow .q{font-size:18px}.prow .a{border-left:0;border-top:1px solid var(--edge)}
  .mcard{padding:17px;font-size:13px}.match{min-height:430px}
  .row,.row.ch{grid-template-columns:1fr}
  form{padding:6px 20px 26px;border-radius:22px}
  legend{font-size:19px}
  .aside{padding:28px 24px;border-radius:22px}.aside h1{font-size:29px}
  .duo a{padding:32px 26px;min-height:200px}.contact{padding:28px 24px}
  .zalo img{width:120px;height:120px}
}