:root{--navy:#0b3042;--blue:#0b5f7a;--cyan:#12a8b4;--gold:#eaa82c;--orange:#c85a21;--ink:#17313d;--muted:#60727b;--pale:#eef8fa;--white:#fff;--shadow:0 24px 70px rgba(10,48,66,.15)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:88px}body{margin:0;color:var(--ink);background:#fff;font-family:"Segoe UI",Arial,sans-serif;font-size:16px;line-height:1.65}img{max-width:100%;display:block}a{color:inherit}.container{width:min(1160px,calc(100% - 40px));margin:auto}.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.95);backdrop-filter:blur(14px);border-bottom:1px solid rgba(11,95,122,.1)}.header-inner{min-height:78px;display:flex;align-items:center;justify-content:space-between;gap:30px}.brand{display:flex;align-items:center;gap:12px;text-decoration:none}.brand img{width:77px;height:46px;object-fit:contain}.brand span{display:flex;flex-direction:column;line-height:1.1}.brand strong{font-size:1.05rem;letter-spacing:.1em;color:var(--navy)}.brand small{margin-top:5px;color:var(--muted)}nav{display:flex;align-items:center;gap:28px}nav a{text-decoration:none;font-weight:650;font-size:.95rem}nav a:hover{color:var(--blue)}.nav-cta{background:var(--navy);color:#fff!important;padding:9px 18px;border-radius:999px}.menu-toggle{display:none;background:none;border:0;padding:8px}.menu-toggle span{display:block;width:26px;height:2px;background:var(--navy);margin:5px}.hero{position:relative;overflow:hidden;background:linear-gradient(135deg,#f0fbfd 0%,#fff 56%,#fff7e8 100%);padding:88px 0 78px}.hero:before{content:"";position:absolute;width:420px;height:420px;border-radius:50%;border:80px solid rgba(18,168,180,.06);left:-260px;top:-80px}.hero-grid{display:grid;grid-template-columns:.9fr 1.25fr;gap:62px;align-items:center}.eyebrow{margin:0 0 14px;color:var(--orange);font-size:.82rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase}.hero h1,.section h2{font-family:Georgia,"Times New Roman",serif;line-height:1.1;letter-spacing:-.025em;color:var(--navy)}.hero h1{font-size:clamp(2.6rem,5vw,4.5rem);margin:0 0 24px}.hero h1 span{color:var(--blue)}.lead{font-size:1.15rem;color:#49636f;max-width:620px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:34px 0 24px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:50px;padding:0 23px;border-radius:8px;text-decoration:none;font-weight:750}.button.primary{color:#fff;background:linear-gradient(135deg,var(--blue),var(--navy));box-shadow:0 10px 25px rgba(11,95,122,.22)}.button.secondary{border:1px solid #b8cbd2;background:#fff}.hero-points{display:flex;flex-wrap:wrap;gap:18px;color:#47616c;font-size:.92rem}.hero-points span:first-letter{color:var(--cyan)}.hero-visual{position:relative}.hero-visual>img{position:relative;border-radius:14px;border:7px solid #fff;box-shadow:var(--shadow);transform:perspective(1100px) rotateY(-3deg)}.visual-glow{position:absolute;inset:-15%;background:radial-gradient(circle,rgba(234,168,44,.28),transparent 60%);filter:blur(15px)}.floating-card{position:absolute;right:-18px;bottom:-28px;display:flex;flex-direction:column;background:var(--navy);color:#fff;padding:16px 22px;border-radius:10px;box-shadow:0 12px 28px rgba(10,48,66,.28)}.floating-card b{color:#ffd36a}.floating-card span{font-size:.85rem}.trust-strip{background:var(--navy);color:#fff}.trust-grid{display:grid;grid-template-columns:repeat(3,1fr);padding:26px 0}.trust-grid div{display:flex;flex-direction:column;padding:0 28px;border-right:1px solid rgba(255,255,255,.16)}.trust-grid div:last-child{border:0}.trust-grid b{color:#ffd36a;font-size:1.04rem}.trust-grid span{color:#cfe1e8;font-size:.9rem}.section{padding:100px 0}.section-heading{text-align:center;max-width:720px;margin:0 auto 48px}.section h2{font-size:clamp(2.1rem,4vw,3.3rem);margin:0 0 18px}.section-heading>p:last-child,.product-copy>p,.cloud-copy>p,.contact-grid>div>p:last-child{color:var(--muted);font-size:1.06rem}.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.feature{position:relative;padding:30px 25px 26px;border:1px solid #dcebee;border-radius:14px;background:#fff;transition:.25s}.feature:hover{transform:translateY(-5px);box-shadow:0 16px 35px rgba(11,48,66,.09);border-color:#aad7dd}.feature-no{font:700 2.2rem Georgia,serif;color:#b8dfe3}.feature h3{font-size:1.15rem;color:var(--navy);margin:14px 0 10px}.feature p{margin:0;color:var(--muted)}.product-section{background:var(--pale);overflow:hidden}.product-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:80px;align-items:center}.check-list{padding:0;margin:30px 0 0;list-style:none}.check-list li{position:relative;padding:10px 0 10px 34px;border-bottom:1px solid #d7e8eb}.check-list li:before{content:"✓";position:absolute;left:0;color:var(--cyan);font-weight:900}.product-gallery{min-height:530px;position:relative}.paper{position:absolute;margin:0;background:#fff;padding:9px;border-radius:10px;box-shadow:var(--shadow)}.paper img{border-radius:5px}.paper figcaption{text-align:center;padding:9px 5px 3px;color:var(--navy);font-weight:700}.paper-tall{width:45%;left:4%;top:0;transform:rotate(-3deg)}.paper-card{width:61%;right:0;bottom:15px;transform:rotate(3deg)}.cloud-section{padding-top:0;background:var(--pale)}.cloud-card{background:linear-gradient(135deg,#073b52,#0b6f83);border-radius:24px;padding:64px;display:grid;grid-template-columns:.85fr 1.15fr;align-items:center;gap:50px;color:#fff;overflow:hidden;position:relative}.cloud-card:after{content:"";position:absolute;width:280px;height:280px;border:60px solid rgba(255,255,255,.05);border-radius:50%;right:-150px;top:-130px}.eyebrow.light{color:#ffd36a}.cloud-card h2{color:#fff}.cloud-copy>p{color:#d4e9ed!important}.cloud-diagram{display:grid;grid-template-columns:1fr 1.2fr 1fr;gap:12px;align-items:center;position:relative;z-index:1}.cloud-node,.school-node{border:1px solid rgba(255,255,255,.2);background:rgba(255,255,255,.09);backdrop-filter:blur(5px);border-radius:12px;text-align:center;padding:17px 10px}.cloud-node{grid-row:span 2;display:flex;min-height:156px;flex-direction:column;justify-content:center;background:#fff;color:var(--navy);box-shadow:0 15px 35px rgba(0,0,0,.18)}.cloud-node span{font-size:2.4rem;color:var(--cyan);line-height:1}.cloud-node small{color:var(--muted)}.contact-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:70px;align-items:center}.contact-card{font-style:normal;background:#fff;border:1px solid #dce8eb;border-top:5px solid var(--gold);border-radius:14px;padding:28px 32px;box-shadow:0 18px 45px rgba(10,48,66,.08)}.contact-card h3{color:var(--navy);line-height:1.35;margin-top:0}.contact-card p{margin:10px 0}.phone-links{display:flex;gap:12px;flex-wrap:wrap;margin-top:20px}.phone-links a{background:#fff4dc;color:#9e4618;padding:10px 16px;border-radius:7px;text-decoration:none;font-weight:800}footer{background:#062d3f;color:#cbdbe1;padding:24px 0}.footer-inner{display:flex;justify-content:space-between;gap:20px;font-size:.9rem}.footer-inner a{color:#fff}.call-float{position:fixed;z-index:30;right:20px;bottom:20px;display:flex;align-items:center;gap:9px;background:#d75b23;color:#fff;text-decoration:none;padding:11px 17px;border-radius:999px;box-shadow:0 10px 30px rgba(150,57,20,.35)}.call-float span{font-size:1.2rem}
@media(max-width:900px){.hero-grid,.product-grid,.cloud-card,.contact-grid{grid-template-columns:1fr}.hero-grid{gap:52px}.feature-grid{grid-template-columns:repeat(2,1fr)}.cloud-card{padding:45px 34px}.product-copy{max-width:700px}.product-gallery{max-width:680px;width:100%;margin:auto}.menu-toggle{display:block}nav{display:none;position:absolute;top:78px;left:0;right:0;padding:22px;background:#fff;border-bottom:1px solid #dbe7ea;flex-direction:column;align-items:stretch}nav.open{display:flex}nav a{text-align:center}.trust-grid{grid-template-columns:1fr}.trust-grid div{border-right:0;border-bottom:1px solid rgba(255,255,255,.15);padding:14px 0}.trust-grid div:last-child{border-bottom:0}}
@media(max-width:600px){.container{width:min(100% - 28px,1160px)}.site-header .brand small{display:none}.brand img{width:66px}.hero{padding:58px 0 60px}.hero h1{font-size:2.55rem}.hero-actions{flex-direction:column}.button{width:100%}.hero-points{gap:8px;flex-direction:column}.floating-card{position:relative;right:auto;bottom:auto;width:max-content;margin:-10px 12px 0 auto}.feature-grid{grid-template-columns:1fr}.section{padding:72px 0}.product-gallery{min-height:440px}.paper-tall{width:51%;left:0}.paper-card{width:66%}.cloud-card{width:100%;border-radius:0;padding:55px 24px}.cloud-diagram{grid-template-columns:1fr 1fr}.cloud-node{grid-row:auto;grid-column:1/-1;order:-1}.contact-card{padding:24px 20px}.footer-inner{flex-direction:column}.call-float b{display:none}.call-float{padding:13px 17px}.phone-links{flex-direction:column}.phone-links a{text-align:center}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.feature{transition:none}}
.cloud-visual{position:relative;z-index:1;margin:0;background:#fff;padding:9px;border-radius:16px;box-shadow:0 20px 50px rgba(0,0,0,.25)}
.cloud-visual img{width:100%;border-radius:10px}
.cloud-visual figcaption{padding:10px 8px 5px;text-align:center;color:var(--navy);font-size:.88rem;font-weight:750}
/* Font hệ thống hỗ trợ đầy đủ dấu tiếng Việt; tránh lỗi dấu tách rời của Georgia. */
.hero h1,.section h2{font-family:"Segoe UI",Arial,sans-serif;font-weight:800;line-height:1.14;letter-spacing:-.025em}