:root{
  --green:#38b84a;
  --green-dark:#23853b;
  --green-soft:#eef9f0;
  --ink:#1f252b;
  --muted:#66717c;
  --line:#e8ecef;
  --paper:#ffffff;
  --soft:#f7f9fa;
  --shadow:0 18px 50px rgba(19,48,30,.12);
  --radius:18px;
  --container:1160px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--paper);line-height:1.65}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
img{max-width:100%;display:block}
.container{width:min(var(--container),calc(100% - 40px));margin-inline:auto}
.section{padding:86px 0}
.section.soft{background:var(--soft)}
.eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--green-dark);font-size:13px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;margin-bottom:14px}
.eyebrow:before{content:"";width:28px;height:2px;background:var(--green);border-radius:9px}
.section-title{font-size:clamp(30px,4vw,44px);line-height:1.15;margin:0 0 18px;letter-spacing:-.035em}
.section-copy{color:var(--muted);max-width:760px;margin:0 auto}
.center{text-align:center}
.btn{border:0;border-radius:999px;display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:0 24px;font-weight:800;cursor:pointer;transition:.2s ease}
.btn-primary{background:var(--green);color:#fff;box-shadow:0 10px 24px rgba(56,184,74,.28)}
.btn-primary:hover{transform:translateY(-2px);background:#2eaa41}
.btn-ghost{background:#fff;color:var(--ink);border:1px solid rgba(255,255,255,.45)}
.btn-outline{background:#fff;color:var(--green-dark);border:1px solid #bfe7c6}
.tag{display:inline-flex;gap:8px;align-items:center;border-radius:999px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.2);padding:8px 12px;font-size:13px;font-weight:700;color:#eaffed}
.dot{width:8px;height:8px;border-radius:50%;background:#89f19b;box-shadow:0 0 0 5px rgba(137,241,155,.15)}

/* header */
.header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(14px);border-bottom:1px solid rgba(232,236,239,.9)}
.nav{height:76px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:12px;font-weight:900;font-size:24px;letter-spacing:-.04em}
.brand-mark{width:42px;height:34px;position:relative;border:4px solid var(--green);border-top-left-radius:24px;border-top-right-radius:24px;border-bottom:0}
.brand-mark:before{content:"";position:absolute;left:7px;bottom:-9px;width:15px;height:15px;border:4px solid var(--green-dark);border-radius:50%}
.brand-mark:after{content:"";position:absolute;left:20px;bottom:-1px;width:18px;height:4px;background:var(--green-dark);box-shadow:10px 7px 0 -1px var(--green-dark)}
.brand b{color:var(--green)}
.nav-links{display:flex;align-items:center;gap:30px;font-size:14px;font-weight:700}
.nav-links a{position:relative}
.nav-links a:after{content:"";position:absolute;left:0;right:100%;bottom:-8px;height:2px;background:var(--green);transition:.2s}
.nav-links a:hover:after,.nav-links a.active:after{right:0}
.nav-actions{display:flex;align-items:center;gap:10px}
.lang{border:1px solid var(--line);border-radius:999px;background:#fff;padding:9px 12px;color:#4d5964;font-weight:700}
.mobile-toggle{display:none;width:44px;height:44px;border:1px solid var(--line);border-radius:12px;background:#fff;font-size:20px;cursor:pointer}
.dropdown{position:relative}
.dropdown-menu{position:absolute;top:32px;left:-22px;min-width:190px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:14px;padding:8px;opacity:0;visibility:hidden;transform:translateY(8px);transition:.18s}
.dropdown:hover .dropdown-menu,.dropdown.open .dropdown-menu{opacity:1;visibility:visible;transform:translateY(0)}
.dropdown-menu a{display:block;padding:10px 12px;border-radius:10px}
.dropdown-menu a:hover{background:var(--green-soft)}

/* hero */
.hero{position:relative;overflow:hidden;background:radial-gradient(circle at 76% 30%,rgba(120,235,142,.24),transparent 26%),linear-gradient(135deg,#13291c 0%,#153e24 52%,#1a6433 100%);color:#fff;padding:96px 0 90px;min-height:650px;display:flex;align-items:center}
.hero:before,.hero:after{content:"";position:absolute;border:1px solid rgba(255,255,255,.08);border-radius:50%}
.hero:before{width:540px;height:540px;right:-170px;top:-190px}.hero:after{width:360px;height:360px;right:40px;bottom:-200px}
.hero-grid{position:relative;z-index:2;display:grid;grid-template-columns:1.03fr .97fr;gap:64px;align-items:center}
.hero h1{font-size:clamp(45px,6vw,74px);line-height:.99;margin:18px 0 24px;letter-spacing:-.055em;max-width:760px}
.hero h1 span{color:#6ee381}
.hero p{font-size:18px;color:#d9eadc;max-width:650px;margin:0 0 30px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.hero-proof{display:flex;gap:24px;margin-top:34px;color:#cfdfd2;font-size:13px}
.hero-proof strong{display:block;color:#fff;font-size:18px}
.hero-art{position:relative;height:470px}
.device{position:absolute;right:4%;top:3%;width:310px;height:430px;border-radius:42px;background:#fff;padding:14px;box-shadow:0 30px 70px rgba(0,0,0,.35);transform:rotate(3deg)}
.device-screen{height:100%;border-radius:30px;background:linear-gradient(#eefaf0,#fff);padding:34px 20px;color:var(--ink);position:relative;overflow:hidden}
.device-screen:before{content:"";position:absolute;top:11px;left:50%;transform:translateX(-50%);width:68px;height:7px;border-radius:99px;background:#dce4de}
.otp-card{background:#fff;border:1px solid #dfe9e2;box-shadow:0 16px 38px rgba(21,92,43,.12);padding:20px;border-radius:18px;margin-top:42px}
.otp-card h3{font-size:15px;margin:0 0 5px}.otp-card p{color:#7b8880;font-size:12px;margin:0 0 18px}.otp-code{display:flex;gap:7px}.otp-code span{width:32px;height:42px;border:1px solid #cfe2d2;border-radius:8px;display:grid;place-items:center;font-weight:900;color:var(--green-dark);background:#f7fff8}
.channel{position:absolute;display:flex;align-items:center;gap:10px;background:rgba(255,255,255,.98);color:var(--ink);border-radius:16px;padding:12px 16px;box-shadow:0 16px 45px rgba(0,0,0,.17);font-weight:800;font-size:13px}
.channel i{font-style:normal;width:30px;height:30px;border-radius:9px;background:var(--green-soft);display:grid;place-items:center;color:var(--green-dark)}
.channel.c1{left:0;top:88px}.channel.c2{left:15px;bottom:70px}.channel.c3{right:-30px;bottom:22px}

/* home content */
.split{display:grid;grid-template-columns:1fr 1fr;gap:62px;align-items:center}
.visual-panel{min-height:440px;border-radius:28px;background:linear-gradient(145deg,#f5fff6,#e5f7e8);position:relative;overflow:hidden;border:1px solid #def0e1}
.visual-cloud{position:absolute;left:14%;top:18%;width:72%;height:46%;border:7px solid var(--green);border-radius:120px 120px 70px 70px}
.visual-cloud:before{content:"";position:absolute;width:110px;height:110px;border-radius:50%;border:7px solid var(--green-dark);left:24%;top:35%;background:#f2fff4}
.visual-cloud:after{content:"✓";position:absolute;left:34%;top:50%;font-size:40px;color:var(--green-dark);font-weight:900;transform:translate(-50%,-50%)}
.visual-line{position:absolute;left:47%;top:47%;width:36%;height:7px;background:var(--green-dark);border-radius:12px}
.visual-line:after{content:"";position:absolute;right:0;top:22px;width:85px;height:7px;background:var(--green-dark);border-radius:12px}
.floating-card{position:absolute;background:#fff;border:1px solid #e6ede7;box-shadow:var(--shadow);border-radius:16px;padding:14px 16px;font-size:13px;font-weight:800}.floating-card.one{left:8%;bottom:9%}.floating-card.two{right:7%;bottom:17%}
.bullets{display:grid;gap:13px;margin:26px 0}.bullet{display:flex;gap:12px;color:#4e5a64}.bullet .check{flex:0 0 24px;height:24px;border-radius:50%;display:grid;place-items:center;background:var(--green-soft);color:var(--green-dark);font-weight:900}

/* features */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:42px}.feature{border:1px solid var(--line);border-radius:18px;padding:26px;background:#fff;transition:.2s}.feature:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:#d1ead6}.icon{width:48px;height:48px;border-radius:14px;background:var(--green-soft);color:var(--green-dark);display:grid;place-items:center;font-size:22px;font-weight:900;margin-bottom:18px}.feature h3{font-size:18px;margin:0 0 9px}.feature p{margin:0;color:var(--muted);font-size:14px}
.connection-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;margin-top:38px}.connection{padding:32px;border-radius:22px;background:#17251c;color:#fff;position:relative;overflow:hidden}.connection:after{content:"";position:absolute;width:160px;height:160px;border-radius:50%;right:-60px;top:-70px;border:28px solid rgba(90,217,112,.12)}.connection p{color:#c8d6cb;margin-bottom:0}.connection code{background:rgba(255,255,255,.08);padding:4px 8px;border-radius:8px;color:#8de99d}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:#dfe9e1;border:1px solid #dfe9e1;border-radius:22px;overflow:hidden;margin-top:56px}.stat{background:#fff;padding:38px;text-align:center}.stat strong{display:block;font-size:42px;line-height:1;color:var(--green-dark);margin-bottom:10px}.stat span{font-size:13px;font-weight:800;letter-spacing:.05em;color:#6d786f}
.sms-showcase{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:38px}.sms-shot{height:310px;border-radius:22px;background:linear-gradient(150deg,#d8f1dd,#f8fbf8);border:1px solid #dfebe1;padding:18px;position:relative;overflow:hidden}.sms-shot:nth-child(even){background:linear-gradient(150deg,#eef1f3,#fff)}.phone-mini{width:72%;height:245px;background:#fff;border:8px solid #222c26;border-radius:30px;position:absolute;left:50%;top:26px;transform:translateX(-50%);padding:24px 12px 10px;box-shadow:0 16px 35px rgba(23,48,29,.16)}.phone-mini:before{content:"";position:absolute;top:7px;left:50%;transform:translateX(-50%);width:44px;height:5px;border-radius:99px;background:#1f252b}.bubble{background:#eef8f0;border-radius:10px;padding:9px;margin-bottom:9px;font-size:10px;color:#445047}.bubble b{color:var(--green-dark)}.sms-label{position:absolute;left:18px;right:18px;bottom:14px;text-align:center;font-weight:900;font-size:12px;letter-spacing:.04em}

/* pricing */
.pricing{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin-top:40px}.price-card{border:1px solid var(--line);border-radius:24px;background:#fff;padding:34px;box-shadow:0 10px 30px rgba(22,42,27,.05)}.price-card.featured{border:2px solid var(--green);position:relative}.price-card.featured:before{content:"ĐƯỢC QUAN TÂM";position:absolute;right:22px;top:-13px;background:var(--green);color:#fff;font-size:11px;font-weight:900;padding:6px 10px;border-radius:999px;letter-spacing:.05em}.price-card h3{margin:0;font-size:20px}.price{font-size:38px;font-weight:900;letter-spacing:-.04em;margin:15px 0 6px}.price small{font-size:14px;color:var(--muted);font-weight:600}.benefits{list-style:none;padding:0;margin:24px 0;display:grid;gap:11px}.benefits li{display:flex;gap:10px;color:#515e57;font-size:14px}.benefits li:before{content:"✓";color:var(--green-dark);font-weight:900}

/* contact/form */
.contact-wrap{display:grid;grid-template-columns:.85fr 1.15fr;gap:34px;align-items:stretch}.contact-info{border-radius:26px;background:linear-gradient(145deg,#14371f,#1f6d34);color:#fff;padding:42px;position:relative;overflow:hidden}.contact-info:after{content:"";position:absolute;width:250px;height:250px;border-radius:50%;border:35px solid rgba(255,255,255,.06);right:-100px;bottom:-120px}.contact-info p{color:#d7e7da}.contact-points{display:grid;gap:14px;margin-top:28px}.contact-point{display:flex;align-items:flex-start;gap:12px;font-size:14px}.contact-point span:first-child{width:34px;height:34px;display:grid;place-items:center;background:rgba(255,255,255,.11);border-radius:10px;flex:0 0 34px}.form-card{border:1px solid var(--line);border-radius:26px;padding:34px;background:#fff;box-shadow:0 12px 40px rgba(24,59,33,.07)}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.field{display:grid;gap:7px}.field.full{grid-column:1/-1}.field label{font-size:12px;font-weight:800;color:#465048}.field input,.field select,.field textarea{width:100%;border:1px solid #dde4df;border-radius:12px;min-height:48px;padding:10px 13px;outline:none;background:#fff;transition:.2s}.field textarea{min-height:112px;resize:vertical}.field input:focus,.field select:focus,.field textarea:focus{border-color:#7fd58c;box-shadow:0 0 0 4px rgba(56,184,74,.1)}
.form-note{font-size:12px;color:#7b8580;margin-top:14px}

/* modal */
.modal-backdrop{position:fixed;inset:0;background:rgba(9,20,12,.72);z-index:100;display:none;align-items:center;justify-content:center;padding:24px}.modal-backdrop.show{display:flex}.modal{width:min(760px,100%);max-height:min(86vh,860px);overflow:auto;background:#fff;border-radius:24px;padding:30px;box-shadow:0 30px 80px rgba(0,0,0,.35);position:relative}.modal h2{margin:0 0 22px}.modal-close{position:absolute;right:18px;top:18px;width:40px;height:40px;border-radius:50%;border:1px solid var(--line);background:#fff;font-size:22px;cursor:pointer}
.toast{position:fixed;right:22px;bottom:22px;z-index:120;background:#17251c;color:#fff;padding:14px 18px;border-radius:13px;box-shadow:var(--shadow);transform:translateY(30px);opacity:0;pointer-events:none;transition:.25s}.toast.show{transform:translateY(0);opacity:1}

/* footer */
.footer{background:#111a14;color:#b8c3bb;padding:46px 0 38px}.footer-grid{display:grid;grid-template-columns:1.05fr 1.7fr auto;gap:34px;align-items:start}.footer .brand{color:#fff;font-size:20px;display:flex;align-items:center;gap:10px}.footer-brand p{margin:12px 0 0;font-weight:800;color:#e6efe9;font-size:13px;letter-spacing:.02em}.footer-brand small{font-size:11px;color:#7d8c82}.footer-info p{margin:0 0 9px;font-size:13px}.footer-info strong{color:#e6efe9;font-weight:700}.footer-info a{color:#9ce5a8;text-decoration:none}.footer-info a:hover{text-decoration:underline}.footer-links{display:flex;flex-direction:column;gap:10px;font-size:12px;font-weight:700}.footer-links a{color:#b8c3bb;text-decoration:none}.footer-links a:hover{color:#9ce5a8}
.backtop{position:fixed;right:22px;bottom:82px;width:44px;height:44px;border:0;border-radius:50%;background:var(--green);color:#fff;font-size:18px;cursor:pointer;box-shadow:0 12px 30px rgba(56,184,74,.35);opacity:0;transform:translateY(10px);pointer-events:none;transition:.2s;z-index:40}.backtop.show{opacity:1;transform:none;pointer-events:auto}

/* sms hero */
.page-hero{background:linear-gradient(135deg,#112d1a,#1a6030);color:#fff;padding:86px 0 76px;position:relative;overflow:hidden}.page-hero:after{content:"SMS";position:absolute;right:2%;bottom:-88px;font-size:260px;font-weight:950;letter-spacing:-.08em;color:rgba(255,255,255,.035)}.page-hero .container{position:relative;z-index:2}.page-hero h1{font-size:clamp(46px,6vw,72px);line-height:1;margin:12px 0 20px;letter-spacing:-.05em}.page-hero p{max-width:850px;color:#d7e6da;font-size:17px}.crumb{font-size:13px;color:#a8c3ae}.inline-badges{display:flex;gap:10px;flex-wrap:wrap;margin-top:26px}.inline-badge{padding:9px 12px;border-radius:999px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.14);font-size:12px;font-weight:800}
.two-col-copy{display:grid;grid-template-columns:1.12fr .88fr;gap:54px;align-items:center}.copy-card{border:1px solid var(--line);border-radius:22px;padding:28px;background:#fff}.copy-card h3{margin-top:0}.copy-card ul{padding-left:18px;color:var(--muted)}
.brandname-visual{min-height:390px;background:linear-gradient(145deg,#e8f8eb,#fafcfb);border:1px solid #deeee1;border-radius:26px;position:relative;overflow:hidden}.brandname-visual .phone-mini{width:46%;height:330px;top:30px}.brandname-visual .sender{position:absolute;right:7%;top:22%;background:#fff;border:1px solid #e0ebe2;border-radius:16px;padding:14px 16px;box-shadow:var(--shadow);font-size:13px;font-weight:900;color:var(--green-dark)}.brandname-visual .sender:before{content:"Brandname";display:block;color:#879189;font-size:10px;font-weight:700;margin-bottom:3px}.brandname-visual .api-chip{position:absolute;left:5%;bottom:9%;background:#17251c;color:#9ce5a8;border-radius:13px;padding:12px 14px;font-family:ui-monospace,monospace;font-size:11px;box-shadow:var(--shadow)}

@media (max-width:980px){
  .nav-links{position:fixed;left:20px;right:20px;top:84px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:18px;display:none;flex-direction:column;align-items:flex-start;gap:16px}.nav-links.show{display:flex}.dropdown-menu{position:static;box-shadow:none;border:0;padding:6px 0 0 14px;display:none;opacity:1;visibility:visible;transform:none}.dropdown.open .dropdown-menu{display:block}.mobile-toggle{display:block}.nav-actions .btn{display:none}
  .hero-grid,.split,.two-col-copy,.contact-wrap{grid-template-columns:1fr}.hero-art{height:440px}.feature-grid{grid-template-columns:repeat(2,1fr)}.sms-showcase{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:680px){
  .container{width:min(100% - 28px,var(--container))}.section{padding:64px 0}.hero{padding:70px 0 64px}.hero h1{font-size:46px}.hero-art{height:390px}.device{width:245px;height:350px;right:0}.channel.c1{left:0;top:42px}.channel.c2{left:0;bottom:18px}.channel.c3{right:0;bottom:66px}.hero-proof{gap:14px;flex-wrap:wrap}.feature-grid,.connection-grid,.stats,.pricing,.form-grid{grid-template-columns:1fr}.stats{gap:1px}.sms-showcase{grid-template-columns:1fr 1fr}.sms-shot{height:260px}.phone-mini{height:204px}.contact-info,.form-card{padding:26px}.footer-grid{grid-template-columns:1fr}.footer-links{flex-wrap:wrap;flex-direction:row;gap:18px}.page-hero{padding:62px 0}.page-hero:after{font-size:150px;bottom:-45px}
}
@media (max-width:440px){.sms-showcase{grid-template-columns:1fr}.sms-shot{height:310px}.phone-mini{height:245px}.nav-actions .lang{display:none}}