/* ============================================================
   ATiGB Survey — Design System
   Palette: forest green + gold + cream, luxurious & modern
   ============================================================ */
:root{
  /* ASTRI brand: xanh lá đậm (wordmark) + xanh cốm (lá) + trắng */
  --forest:#137A3A; --forest-2:#16883F; --forest-3:#2FA457;
  --forest-deep:#0C5A29;
  --gold:#5C9E2E; --gold-2:#8DCB3F; --gold-soft:#E9F5D7;   /* leaf/lime accent */
  --lime:#8DCB3F; --lime-bright:#A6E05A;
  --cream:#F6FAF2; --cream-2:#EAF3E0; --paper:#FFFFFF;
  --ink:#182016; --ink-2:#465043; --muted:#84918010;
  --muted:#7E8C79;
  --line:#DFEAD3; --line-2:#CDDEBD;
  --blue:#2E7D5B; --terra:#C77A34; --violet:#4E9A6B;
  --danger:#B23A48; --ok:#16883F; --warn:#C99000;
  --shadow-sm:0 1px 3px rgba(19,122,58,.07),0 1px 2px rgba(19,122,58,.05);
  --shadow:0 8px 30px rgba(19,122,58,.10),0 2px 8px rgba(19,122,58,.06);
  --shadow-lg:0 24px 60px rgba(12,90,41,.16);
  --radius:18px; --radius-sm:12px; --radius-lg:26px;
  --serif:'Cormorant Garamond',Georgia,'Times New Roman',serif;
  --sans:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --maxw:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);color:var(--ink);background:var(--cream);
  line-height:1.65;font-size:16px;-webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:var(--serif);font-weight:600;line-height:1.12;letter-spacing:-.01em;color:var(--forest)}
a{color:var(--forest-2);text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.eyebrow{font-family:var(--sans);font-size:.72rem;font-weight:600;letter-spacing:.22em;
  text-transform:uppercase;color:var(--gold);display:inline-flex;align-items:center;gap:.6em}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--gold)}
.section{padding:96px 0;position:relative}
.section-title{font-size:clamp(2rem,4vw,3.1rem);margin:.4rem 0 .6rem}
.section-sub{color:var(--ink-2);max-width:640px;font-size:1.05rem}
.center{text-align:center}
.center .eyebrow{justify-content:center}
.center .section-sub{margin-left:auto;margin-right:auto}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  font-family:var(--sans);font-weight:600;font-size:.95rem;padding:14px 28px;
  border-radius:100px;border:1px solid transparent;cursor:pointer;transition:.25s cubic-bezier(.2,.7,.3,1);
  text-decoration:none;white-space:nowrap}
.btn-primary{background:linear-gradient(135deg,var(--forest-2),var(--forest));color:#fff;
  box-shadow:0 10px 24px rgba(20,67,47,.24)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 34px rgba(20,67,47,.30)}
.btn-gold{background:linear-gradient(135deg,var(--gold-2),var(--gold));color:var(--forest);
  box-shadow:0 10px 24px rgba(200,162,74,.3)}
.btn-gold:hover{transform:translateY(-2px)}
.btn-ghost{background:transparent;border-color:var(--line-2);color:var(--forest)}
.btn-ghost:hover{background:var(--paper);border-color:var(--gold)}
.btn-sm{padding:9px 16px;font-size:.85rem}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none!important}

/* ---------- Navbar ---------- */
.nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);
  background:rgba(250,247,240,.82);border-bottom:1px solid var(--line);transition:.3s}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:74px}
.brand{display:flex;align-items:center;gap:12px;font-family:var(--serif);font-weight:700;
  font-size:1.15rem;color:var(--forest)}
.brand .mark{width:40px;height:40px;border-radius:11px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--forest-2),var(--forest));color:var(--gold-2);
  font-family:var(--serif);font-size:1.2rem;font-weight:700;box-shadow:var(--shadow-sm)}
.nav-links{display:flex;gap:6px;align-items:center}
.nav-links a{padding:9px 15px;border-radius:100px;font-size:.9rem;font-weight:500;color:var(--ink-2);transition:.2s}
.nav-links a:hover{color:var(--forest);background:var(--cream-2)}
.nav-toggle{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--forest)}
@media(max-width:860px){
  .nav-links{position:fixed;inset:74px 0 auto 0;flex-direction:column;background:var(--paper);
    padding:16px;gap:4px;border-bottom:1px solid var(--line);box-shadow:var(--shadow);
    transform:translateY(-120%);transition:.3s;align-items:stretch}
  .nav-links.open{transform:translateY(0)}
  .nav-links a{padding:14px}
  .nav-toggle{display:block}
}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;background:
  radial-gradient(1200px 600px at 80% -10%,rgba(141,203,63,.18),transparent 60%),
  radial-gradient(900px 500px at 0% 20%,rgba(19,122,58,.10),transparent 55%),
  linear-gradient(180deg,var(--cream),var(--cream-2))}
.hero-inner{padding:90px 0 100px;display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center}
.hero h1{font-size:clamp(2.4rem,5vw,4.2rem);margin:18px 0 20px}
.hero .lead{font-size:1.18rem;color:var(--ink-2);max-width:560px;margin-bottom:32px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.hero-badges{display:flex;gap:28px;margin-top:40px;flex-wrap:wrap}
.hero-badge b{display:block;font-family:var(--serif);font-size:2rem;color:var(--forest);line-height:1}
.hero-badge span{font-size:.82rem;color:var(--muted)}
.hero-art{position:relative}
.hero-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:30px;box-shadow:var(--shadow-lg)}
.hero-card h4{font-family:var(--sans);font-size:.75rem;letter-spacing:.15em;text-transform:uppercase;
  color:var(--gold);margin-bottom:18px}
@media(max-width:860px){.hero-inner{grid-template-columns:1fr;gap:40px;padding:56px 0 64px}}

/* ---------- Stat band (số liệu thật) ---------- */
.statband{background:linear-gradient(135deg,var(--forest),var(--forest-deep));color:#fff;padding:56px 0}
.statband .container{position:relative}
.stat-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:28px}
.stat-head h3{color:#fff;font-size:1.7rem}
.stat-head .src{font-size:.78rem;color:rgba(255,255,255,.6)}
.stat-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:20px}
@media(max-width:900px){.stat-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:560px){.stat-grid{grid-template-columns:repeat(2,1fr)}}
.stat{position:relative;padding-left:16px}
.stat::before{content:"";position:absolute;left:0;top:4px;bottom:4px;width:3px;border-radius:3px;background:var(--lime)}
.stat .sn{font-family:var(--serif);font-size:2.3rem;font-weight:700;line-height:1;color:var(--lime-bright)}
.stat .su{font-size:.78rem;color:rgba(255,255,255,.7);margin-left:4px}
.stat .sl{font-size:.9rem;font-weight:600;margin-top:6px;color:#fff}
.stat .ss{font-size:.76rem;color:rgba(255,255,255,.6)}

/* ---------- ATiGB explainer ---------- */
.atigb-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
@media(max-width:960px){.atigb-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.atigb-grid{grid-template-columns:1fr}}
.atigb-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:22px;
  box-shadow:var(--shadow-sm);position:relative;overflow:hidden;transition:.3s}
.atigb-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.atigb-card::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:var(--dc)}
.atigb-card .code{font-family:var(--serif);font-size:2.4rem;font-weight:700;color:var(--dc);line-height:1}
.atigb-card h4{font-size:1.12rem;margin:6px 0 4px}
.atigb-card .full{font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-weight:600}
.atigb-card p{font-size:.86rem;color:var(--ink-2);margin-top:8px}
.atigb-card .qn{margin-top:12px;font-size:.75rem;font-weight:700;color:var(--dc);background:var(--gold-soft);
  display:inline-block;padding:3px 10px;border-radius:100px}

/* ---------- Cards / grid ---------- */
.grid{display:grid;gap:24px}
.g-2{grid-template-columns:repeat(2,1fr)}
.g-3{grid-template-columns:repeat(3,1fr)}
.g-4{grid-template-columns:repeat(4,1fr)}
@media(max-width:960px){.g-3,.g-4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.g-2,.g-3,.g-4{grid-template-columns:1fr}}
.card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;box-shadow:var(--shadow-sm);transition:.3s}
.card:hover{box-shadow:var(--shadow);transform:translateY(-3px);border-color:var(--line-2)}
.card .icon{width:52px;height:52px;border-radius:14px;display:grid;place-items:center;
  background:var(--gold-soft);color:var(--forest);font-size:1.4rem;margin-bottom:18px}
.card h3{font-size:1.4rem;margin-bottom:8px}

/* dimension chips */
.dims{display:flex;gap:10px;flex-wrap:wrap;margin-top:8px}
.dim-chip{display:inline-flex;align-items:center;gap:8px;padding:8px 14px;border-radius:100px;
  background:var(--paper);border:1px solid var(--line);font-size:.85rem;font-weight:600}
.dim-dot{width:10px;height:10px;border-radius:50%}

/* ---------- News ---------- */
.news-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:22px}
@media(max-width:900px){.news-grid{grid-template-columns:1fr}}
.news-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow-sm);transition:.3s;display:flex;flex-direction:column}
.news-card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.news-card .thumb{height:170px;background:
  linear-gradient(135deg,var(--forest),var(--forest-3));position:relative;display:grid;place-items:center;
  color:var(--gold-2);font-size:2.4rem}
.news-card.feature .thumb{height:240px}
.news-body{padding:22px;display:flex;flex-direction:column;gap:10px;flex:1}
.news-body .meta{font-size:.78rem;color:var(--muted);display:flex;gap:10px;align-items:center}
.news-body h3{font-size:1.25rem}
.tag{font-size:.72rem;font-weight:600;color:var(--gold);letter-spacing:.08em;text-transform:uppercase}

/* ---------- Survey ---------- */
.survey-wrap{max-width:900px;margin:0 auto}
.progress-bar{position:sticky;top:74px;z-index:20;background:rgba(250,247,240,.9);
  backdrop-filter:blur(10px);padding:16px 0;border-bottom:1px solid var(--line)}
.progress-track{height:8px;background:var(--cream-2);border-radius:100px;overflow:hidden}
.progress-fill{height:100%;background:linear-gradient(90deg,var(--gold),var(--forest-3));
  border-radius:100px;transition:width .4s cubic-bezier(.2,.7,.3,1);width:0}
.progress-meta{display:flex;justify-content:space-between;font-size:.82rem;color:var(--ink-2);margin-top:8px}
.step{display:none;animation:fade .4s ease}
.step.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.step-head{margin-bottom:24px}
.step-head .badge{display:inline-flex;align-items:center;gap:8px;padding:7px 15px;border-radius:100px;
  font-size:.8rem;font-weight:700;color:#fff;margin-bottom:12px}
.q-item{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 24px;margin-bottom:16px;box-shadow:var(--shadow-sm)}
.q-item .q-text{font-weight:500;margin-bottom:16px;display:flex;gap:10px}
.q-item .q-num{color:var(--gold);font-family:var(--serif);font-weight:700;font-size:1.05rem}
.q-cols{display:grid;grid-template-columns:1fr 1fr;gap:20px}
@media(max-width:620px){.q-cols{grid-template-columns:1fr}}
.q-col-label{font-size:.78rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;margin-bottom:8px}
.q-col-label.before{color:var(--terra)}
.q-col-label.now{color:var(--blue)}
.likert{display:flex;gap:6px}
.likert label{flex:1;position:relative;cursor:pointer}
.likert input{position:absolute;opacity:0}
.likert .dot{display:grid;place-items:center;height:42px;border-radius:11px;
  border:1.5px solid var(--line-2);background:var(--cream);font-weight:600;font-size:.95rem;
  color:var(--ink-2);transition:.18s}
.likert label:hover .dot{border-color:var(--gold)}
.likert.a input:checked+.dot{background:var(--terra);border-color:var(--terra);color:#fff}
.likert.b input:checked+.dot{background:var(--blue);border-color:var(--blue);color:#fff}
.scale-hint{display:flex;justify-content:space-between;font-size:.72rem;color:var(--muted);margin-top:6px}
.survey-nav{display:flex;justify-content:space-between;gap:14px;margin-top:28px}
.open-q{margin-bottom:20px}
.open-q label{display:block;font-weight:500;margin-bottom:10px}
textarea,input[type=text],input[type=number],select{
  width:100%;font-family:var(--sans);font-size:.95rem;padding:13px 15px;border:1.5px solid var(--line-2);
  border-radius:var(--radius-sm);background:var(--paper);color:var(--ink);transition:.2s;resize:vertical}
textarea:focus,input:focus,select:focus{outline:none;border-color:var(--gold);box-shadow:0 0 0 4px var(--gold-soft)}
.field{margin-bottom:18px}
.field label{display:block;font-size:.85rem;font-weight:600;margin-bottom:7px;color:var(--ink-2)}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:620px){.field-row{grid-template-columns:1fr}}
.thankyou{text-align:center;padding:60px 20px}
.thankyou .check{width:90px;height:90px;border-radius:50%;margin:0 auto 24px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--forest-3),var(--forest));color:var(--gold-2);font-size:2.6rem;
  box-shadow:var(--shadow-lg)}

/* ---------- Publications & events ---------- */
.pub-item{display:flex;gap:18px;padding:22px;background:var(--paper);border:1px solid var(--line);
  border-radius:var(--radius);box-shadow:var(--shadow-sm);transition:.3s}
.pub-item:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.pub-code{flex-shrink:0;width:54px;height:54px;border-radius:14px;display:grid;place-items:center;
  background:var(--forest);color:var(--gold-2);font-family:var(--serif);font-weight:700;font-size:1.1rem}
.pub-meta{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.pill{font-size:.72rem;font-weight:600;padding:4px 11px;border-radius:100px;background:var(--cream-2);color:var(--ink-2)}
.pill.q{background:var(--gold-soft);color:var(--forest)}
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media(max-width:760px){.gallery{grid-template-columns:repeat(2,1fr)}}
.gallery .ph{aspect-ratio:4/3;border-radius:var(--radius);background:linear-gradient(135deg,var(--forest-3),var(--forest));
  display:grid;place-items:center;color:var(--gold-2);font-size:2rem;position:relative;overflow:hidden}
.gallery .ph span.cap{position:absolute;bottom:0;left:0;right:0;padding:14px;font-family:var(--sans);
  font-size:.82rem;color:#fff;background:linear-gradient(transparent,rgba(20,67,47,.85));text-align:left}

/* ---------- Footer ---------- */
.footer{background:var(--forest);color:#D9E4DE;padding:64px 0 32px}
.footer h4{color:#fff;font-family:var(--sans);font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--gold-2);margin-bottom:16px}
.footer a{color:#B9C7C0}.footer a:hover{color:var(--gold-2)}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:40px;margin-bottom:40px}
@media(max-width:760px){.footer-grid{grid-template-columns:1fr}}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding-top:24px;font-size:.85rem;color:#8FA39A;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* ---------- Toast ---------- */
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(120%);
  background:var(--forest);color:#fff;padding:14px 24px;border-radius:100px;box-shadow:var(--shadow-lg);
  z-index:200;transition:.4s;font-size:.9rem;font-weight:500}
.toast.show{transform:translateX(-50%) translateY(0)}
.toast.err{background:var(--danger)}

/* ---------- utilities ---------- */
.mt-1{margin-top:12px}.mt-2{margin-top:24px}.mt-3{margin-top:40px}
.hidden{display:none!important}
.spinner{width:20px;height:20px;border:2.5px solid rgba(255,255,255,.35);border-top-color:#fff;
  border-radius:50%;animation:spin .7s linear infinite;display:inline-block}
@keyframes spin{to{transform:rotate(360deg)}}
.divider-leaf{text-align:center;color:var(--gold);font-size:1.4rem;margin:8px 0}