/* SWATER KANKYO — main stylesheet */
:root{
  --bg:#ffffff;
  --bg-alt:#f0f9ff;
  --bg-dark:#0c2840;
  --bg-darker:#081d30;
  --ink:#0f172a;
  --ink-mute:#475569;
  --ink-dim:#94a3b8;
  --line:#e2e8f0;
  --brand:#0891b2;
  --brand-2:#0ea5e9;
  --brand-deep:#155e75;
  --accent:#06b6d4;
  --ok:#10b981;
  --radius:14px;
  --radius-sm:8px;
  --shadow:0 4px 20px rgba(8,29,48,0.08);
  --shadow-lg:0 20px 50px rgba(8,29,48,0.18);
  --maxw:1200px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Be Vietnam Pro','Inter',system-ui,-apple-system,sans-serif;
  color:var(--ink);
  line-height:1.6;
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--brand);text-decoration:none;transition:color .2s}
a:hover{color:var(--brand-deep)}
ul{list-style:none}
h1,h2,h3,h4{font-family:'Inter',sans-serif;font-weight:700;line-height:1.2;color:var(--ink)}
h1{font-size:clamp(2rem,4.5vw,3.5rem);letter-spacing:-0.02em}
h2{font-size:clamp(1.6rem,3vw,2.4rem);letter-spacing:-0.01em}
h3{font-size:1.25rem}
h4{font-size:1.05rem}

.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* Buttons */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 22px;border-radius:var(--radius-sm);
  font-weight:600;font-size:.95rem;
  border:1.5px solid transparent;cursor:pointer;
  transition:all .2s;text-decoration:none;
  font-family:inherit;
}
.btn-lg{padding:14px 28px;font-size:1rem}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 4px 14px rgba(8,145,178,.3)}
.btn-primary:hover{background:var(--brand-deep);transform:translateY(-1px);box-shadow:0 6px 20px rgba(8,145,178,.4);color:#fff}
.btn-ghost{background:transparent;color:var(--brand-deep);border-color:var(--brand)}
.btn-ghost:hover{background:var(--brand);border-color:var(--brand);color:#fff}
.section-dark .btn-ghost,.hero-dark .btn-ghost{color:#fff;border-color:rgba(255,255,255,.3)}
.section-dark .btn-ghost:hover,.hero-dark .btn-ghost:hover{background:rgba(255,255,255,.1);border-color:#fff;color:#fff}

/* Header */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;gap:24px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--ink)}
.logo:hover{color:var(--ink)}
.logo-mark{
  width:38px;height:38px;border-radius:10px;
  background:linear-gradient(135deg,var(--brand),var(--brand-deep));
  color:#fff;display:flex;align-items:center;justify-content:center;
  font-size:1.2rem;font-weight:800;
}
.logo-text{display:flex;flex-direction:column;line-height:1}
.logo-text small{font-size:.65rem;color:var(--ink-mute);font-weight:500;letter-spacing:.15em}
.logo-img{height:48px;width:auto;display:block}
.logo-img-footer{height:42px;filter:brightness(0) invert(1) opacity(.92)}
.main-nav{display:flex;gap:28px;flex:1;justify-content:center}
.main-nav a{color:var(--ink);font-weight:500;font-size:.95rem}
.main-nav a:hover{color:var(--brand)}
.main-nav a.nav-tech{background:linear-gradient(135deg,#0a6fb8,#5dd5ff);color:#fff!important;padding:6px 14px;border-radius:8px;font-weight:600}
.main-nav a.nav-tech:hover{filter:brightness(1.1)}
.main-nav a.active{color:var(--brand);font-weight:600}
.nav-toggle{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--ink)}

/* Hero */
.hero{
  position:relative;
  padding:90px 0 80px;
  background:linear-gradient(180deg,#f0f9ff 0%,#e0f2fe 100%);
  overflow:hidden;
}
.hero-bg{
  position:absolute;inset:0;
  background:
    radial-gradient(circle at 80% 20%,rgba(8,145,178,.12) 0%,transparent 50%),
    radial-gradient(circle at 10% 90%,rgba(14,165,233,.1) 0%,transparent 50%);
  pointer-events:none;
}
.hero-inner{position:relative;text-align:center;max-width:900px;margin:0 auto}
.badge{
  display:inline-block;padding:6px 14px;
  background:rgba(8,145,178,.12);color:var(--brand-deep);
  border-radius:999px;font-size:.85rem;font-weight:600;
  margin-bottom:24px;letter-spacing:.02em;
}
.hero h1{margin-bottom:20px}
.grad{
  background:linear-gradient(90deg,var(--brand),var(--accent));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.lead{font-size:1.15rem;color:var(--ink-mute);max-width:720px;margin:0 auto 32px}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:60px}
.hero-stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:24px;
  padding:28px;background:#fff;border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.hero-stats div{text-align:center}
.hero-stats strong{display:block;font-size:1.8rem;color:var(--brand-deep);font-weight:800;line-height:1}
.hero-stats span{font-size:.85rem;color:var(--ink-mute);margin-top:6px;display:block}

/* Sections */
.section{padding:90px 0}
.section-dark{background:var(--bg-dark);color:#e2e8f0}
.section-dark h2,.section-dark h3,.section-dark h4{color:#fff}
.section-dark .lead{color:#cbd5e1}
.section-light{background:var(--bg-alt)}

.section-head{text-align:center;max-width:760px;margin:0 auto 56px}
.eyebrow{
  display:inline-block;font-size:.85rem;font-weight:700;
  color:var(--brand);text-transform:uppercase;letter-spacing:.15em;
  margin-bottom:12px;
}
.section-dark .eyebrow{color:var(--accent)}
.section-head p{color:var(--ink-mute);font-size:1.05rem;margin-top:14px}
.section-dark .section-head p{color:#94a3b8}

/* Grid */
.grid{display:grid;gap:24px}
.grid-3{grid-template-columns:repeat(3,1fr)}

/* Cards */
.card{
  background:#fff;padding:28px;border-radius:var(--radius);
  border:1px solid var(--line);
  transition:all .25s;
  display:flex;flex-direction:column;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--brand)}
.card-icon{font-size:2.2rem;margin-bottom:14px}
.card h3{margin-bottom:10px}
.card p{color:var(--ink-mute);font-size:.95rem}
.card-link{display:inline-block;margin-top:14px;font-weight:600;font-size:.9rem}

/* Image cards */
.card-img{padding:0;overflow:hidden}
.card-photo{
  height:180px;background-size:cover;background-position:center;
  border-bottom:1px solid var(--line);
}
.card-img .card-content{padding:24px}
.card-feature{border:2px solid var(--brand);box-shadow:0 8px 30px rgba(8,145,178,.15)}
.card-flag{
  display:inline-block;padding:3px 10px;
  background:var(--brand);color:#fff;
  font-size:.72rem;font-weight:700;border-radius:999px;
  letter-spacing:.08em;margin-bottom:10px;text-transform:uppercase;
}

/* About section */
.about-grid{
  display:grid;grid-template-columns:1.4fr 1fr;gap:60px;align-items:center;
}
.about-grid .lead{font-size:1.1rem;color:var(--ink);margin:18px 0 16px}
.about-grid p{color:var(--ink-mute);margin-bottom:14px;line-height:1.75}
.about-pillars{
  display:grid;grid-template-columns:1fr 1fr;gap:16px;
}
.pillar{
  background:#fff;padding:24px 18px;border-radius:var(--radius);
  border:1px solid var(--line);text-align:center;
  box-shadow:var(--shadow);
}
.pillar strong{
  display:block;font-size:1.6rem;font-weight:800;
  color:var(--brand-deep);line-height:1.1;margin-bottom:6px;
}
.pillar span{font-size:.85rem;color:var(--ink-mute);font-weight:500}
@media (max-width:960px){
  .about-grid{grid-template-columns:1fr;gap:32px}
}

/* SWRO flow */
.swro-flow{
  display:flex;align-items:stretch;gap:8px;
  padding:32px;background:rgba(255,255,255,.04);
  border-radius:var(--radius);margin-bottom:48px;
  border:1px solid rgba(255,255,255,.08);
  overflow-x:auto;
}
.flow-step{
  flex:1;min-width:160px;text-align:center;
  padding:20px 14px;
  background:rgba(8,145,178,.1);border-radius:var(--radius-sm);
  border:1px solid rgba(6,182,212,.2);
}
.flow-step span{
  display:inline-block;width:32px;height:32px;border-radius:50%;
  background:var(--accent);color:#08243d;font-weight:800;
  line-height:32px;margin-bottom:10px;
}
.flow-step h4{font-size:.95rem;margin-bottom:6px;color:#fff}
.flow-step p{font-size:.82rem;color:#94a3b8;line-height:1.4}
.flow-arrow{
  align-self:center;color:var(--accent);font-size:1.4rem;font-weight:700;
  flex-shrink:0;
}

.spec-card{
  background:rgba(255,255,255,.04);
  padding:24px;border-radius:var(--radius);
  border:1px solid rgba(255,255,255,.08);
}
.spec-card h4{color:var(--accent);margin-bottom:8px;font-size:1rem}
.spec-card p{color:#cbd5e1;font-size:.92rem}

.cta-banner{
  margin-top:56px;padding:36px 40px;
  background:linear-gradient(135deg,var(--brand),var(--brand-deep));
  border-radius:var(--radius);
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  flex-wrap:wrap;
}
.cta-banner h3{color:#fff;margin-bottom:6px}
.cta-banner p{color:rgba(255,255,255,.9);font-size:.95rem}
.cta-banner .btn-primary{background:#fff;color:var(--brand-deep)}
.cta-banner .btn-primary:hover{background:#f0f9ff;color:var(--brand-deep)}

/* Project cards */
.project-card{
  background:#fff;border-radius:var(--radius);overflow:hidden;
  border:1px solid var(--line);transition:all .25s;
}
.project-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.project-img{height:200px;background-size:cover;background-position:center}
.project-body{padding:24px}
.tag{
  display:inline-block;padding:4px 10px;
  background:rgba(8,145,178,.1);color:var(--brand-deep);
  font-size:.75rem;font-weight:600;border-radius:999px;
  letter-spacing:.05em;margin-bottom:10px;
}
.project-meta{font-size:.85rem;color:var(--ink-mute);margin-bottom:10px;font-weight:500}
.project-card h3{margin-bottom:8px}
.project-card p{font-size:.92rem;color:var(--ink-mute)}

/* Articles */
.article-card{
  background:#fff;padding:28px;border-radius:var(--radius);
  border:1px solid var(--line);transition:all .25s;
  display:flex;flex-direction:column;
}
.article-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:var(--brand)}
.article-cat{
  font-size:.75rem;font-weight:700;color:var(--brand);
  text-transform:uppercase;letter-spacing:.1em;margin-bottom:12px;
}
.article-card h3{margin-bottom:10px;font-size:1.15rem;line-height:1.35}
.article-card h3 a{color:var(--ink)}
.article-card h3 a:hover{color:var(--brand)}
.article-card p{font-size:.92rem;color:var(--ink-mute);flex:1}
.article-meta{margin-top:16px;font-size:.82rem;color:var(--ink-dim);padding-top:14px;border-top:1px solid var(--line)}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:start}
.contact-list{margin-top:24px}
.contact-list li{padding:8px 0;color:#cbd5e1}
.contact-list strong{color:#fff;display:inline-block;min-width:90px}
.contact-list a{color:var(--accent)}
.contact-form{
  background:rgba(255,255,255,.04);padding:32px;
  border-radius:var(--radius);border:1px solid rgba(255,255,255,.08);
}
.contact-form label{
  display:flex;flex-direction:column;gap:6px;
  margin-bottom:16px;color:#cbd5e1;font-size:.9rem;font-weight:500;
}
.contact-form input,
.contact-form select,
.contact-form textarea{
  background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);
  color:#fff;padding:11px 14px;border-radius:var(--radius-sm);
  font-family:inherit;font-size:.95rem;transition:all .2s;
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus{
  outline:none;border-color:var(--accent);background:rgba(255,255,255,.1);
}
.contact-form textarea{resize:vertical;font-family:inherit}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-note{font-size:.85rem;color:var(--accent);margin-top:12px;min-height:20px}

/* Footer */
.site-footer{background:var(--bg-darker);color:#94a3b8;padding-top:60px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px}
.logo-footer .logo-mark{background:linear-gradient(135deg,var(--accent),var(--brand))}
.logo-footer .logo-text,.logo-footer .logo-text small{color:#fff}
.footer-grid p{margin-top:14px;font-size:.92rem;line-height:1.6}
.footer-grid h4{color:#fff;font-size:.95rem;margin-bottom:14px}
.footer-grid ul li{padding:4px 0;font-size:.92rem}
.footer-grid ul li a{color:#94a3b8}
.footer-grid ul li a:hover{color:var(--accent)}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.08);
  padding:20px 0;font-size:.85rem;text-align:center;
}

/* Responsive */
@media (max-width:960px){
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .hero-stats{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr;gap:32px}
  .footer-grid{grid-template-columns:1fr 1fr}
  .swro-flow{flex-direction:column}
  .flow-arrow{transform:rotate(90deg)}
}
@media (max-width:640px){
  .grid-3{grid-template-columns:1fr}
  .hero{padding:60px 0 50px}
  .section{padding:60px 0}
  .main-nav{display:none}
  .nav-toggle{display:block}
  .nav-wrap .btn{display:none}
  .hero-stats{grid-template-columns:1fr 1fr}
  .form-row{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .cta-banner{flex-direction:column;text-align:center;padding:28px 24px}
  .main-nav.open{
    display:flex;flex-direction:column;
    position:absolute;top:100%;left:0;right:0;
    background:#fff;padding:20px;gap:14px;
    border-bottom:1px solid var(--line);
  }
}

/* === Chat widget (Ms. Ngọc) === */
.contact-chat-wrap{background:#fff;border-radius:16px;box-shadow:0 8px 32px rgba(0,0,0,.18);overflow:hidden;display:flex;flex-direction:column;height:520px}
.chat-header{display:flex;gap:12px;align-items:center;padding:16px 20px;background:linear-gradient(135deg,#0891b2,#155e75);color:#fff}
.chat-avatar{width:44px;height:44px;border-radius:50%;background:#fff;color:#0891b2;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:20px}
.chat-name{font-weight:600;font-size:15px}
.chat-status{font-size:12px;opacity:.85;display:flex;align-items:center;gap:6px}
.chat-status .dot{width:8px;height:8px;border-radius:50%;background:#10b981;display:inline-block;animation:chat-pulse 2s infinite}
@keyframes chat-pulse{0%,100%{opacity:1}50%{opacity:.4}}
.chat-body{flex:1;overflow-y:auto;padding:16px 14px;background:#f8fafc;display:flex;flex-direction:column;gap:10px}
.chat-body .msg{max-width:86%;padding:10px 14px;border-radius:14px;line-height:1.45;font-size:14px;color:#0f172a;word-wrap:break-word}
.chat-body .msg-bot{background:#fff;border:1px solid #e2e8f0;border-bottom-left-radius:4px;align-self:flex-start}
.chat-body .msg-user{background:#0891b2;color:#fff;border-bottom-right-radius:4px;align-self:flex-end}
.chat-body .msg a{color:inherit;text-decoration:underline}
.chat-body .msg-typing{display:flex;gap:4px;align-items:center;padding:14px 16px}
.chat-body .msg-typing span{width:8px;height:8px;border-radius:50%;background:#94a3b8;animation:chat-typing 1.4s infinite}
.chat-body .msg-typing span:nth-child(2){animation-delay:.2s}
.chat-body .msg-typing span:nth-child(3){animation-delay:.4s}
@keyframes chat-typing{0%,60%,100%{transform:translateY(0);opacity:.4}30%{transform:translateY(-6px);opacity:1}}
.chat-input{display:flex;gap:8px;padding:12px;border-top:1px solid #e2e8f0;background:#fff}
.chat-input input{flex:1;padding:10px 14px;border:1px solid #cbd5e1;border-radius:10px;font-size:14px;font-family:inherit;outline:none}
.chat-input input:focus{border-color:#0891b2}
.chat-input button{padding:10px 16px;background:#0891b2;color:#fff;border:none;border-radius:10px;cursor:pointer;font-size:18px;font-weight:700}
.chat-input button:hover{background:#155e75}
.chat-footnote{margin:0;padding:8px 16px 12px;text-align:center;font-size:12px;color:#64748b;background:#fff}
.chat-footnote a{color:#0891b2}