/* ═══════════════════════════════════════
   Healtho.ai — Design 3: Normal Gradient
   Blue-Green · Friendly · Approachable
   ═══════════════════════════════════════ */
:root {
    --blue: #4A7EF5;
    --green: #43B581;
    --teal: #0ea5a0;
    --grad: linear-gradient(135deg, #4A7EF5 0%, #43B581 100%);
    --grad-light: linear-gradient(135deg, rgba(74,126,245,0.08), rgba(67,181,129,0.08));
    --bg: #ffffff;
    --bg-soft: #f5f8fc;
    --text-1: #1e293b;
    --text-2: #64748b;
    --text-3: #94a3b8;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --red: #ef4444; --yellow: #eab308; --green-s: #22c55e; --blue-s: #3b82f6;
    --font: 'Inter','Noto Sans Thai',-apple-system,sans-serif;
    --radius: 16px;
    --shadow: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
    --ease: .3s cubic-bezier(.4,0,.2,1);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{font-family:var(--font);background:var(--bg);color:var(--text-1);line-height:1.7;overflow-x:hidden}
a{text-decoration:none;color:inherit}
ul{list-style:none}
.container{max-width:1140px;margin:0 auto;padding:0 24px}

/* ━━━ NAV ━━━ */
.navbar{position:fixed;top:0;left:0;right:0;z-index:1000;padding:14px 0;background:rgba(255,255,255,.85);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid transparent;transition:var(--ease)}
.navbar.scrolled{padding:10px 0;border-bottom-color:var(--border);box-shadow:var(--shadow)}
.navbar .container{display:flex;align-items:center;justify-content:space-between}
.nav-logo{font-size:22px;font-weight:800;color:var(--text-1)}
.nav-logo span{background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.nav-links{display:flex;gap:28px}
.nav-links a{font-size:14px;font-weight:500;color:var(--text-2);transition:var(--ease)}
.nav-links a:hover{color:var(--blue)}
.nav-links-mobile-auth{display:none}
.nav-actions{display:flex;align-items:center;gap:12px}
.lang-toggle{background:none;border:1.5px solid var(--border);border-radius:8px;padding:6px 14px;font-family:var(--font);font-size:13px;font-weight:600;color:var(--text-2);cursor:pointer;transition:var(--ease);letter-spacing:.5px}
.lang-toggle:hover{border-color:var(--blue);color:var(--blue);background:var(--grad-light)}
.navbar:not(.scrolled) .lang-toggle{border-color:rgba(255,255,255,.3);color:rgba(255,255,255,.8)}
.navbar:not(.scrolled) .lang-toggle:hover{border-color:rgba(255,255,255,.6);color:#fff;background:rgba(255,255,255,.1)}
.btn-login{font-size:14px;color:var(--text-2);padding:8px 14px;transition:var(--ease)}
.btn-login:hover{color:var(--blue)}
.btn-cta{font-size:14px;font-weight:600;padding:10px 20px;background:var(--grad);color:#fff;border-radius:10px;transition:var(--ease)}
.btn-cta:hover{transform:translateY(-2px);box-shadow:0 4px 16px rgba(74,126,245,.3)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.nav-toggle span{width:22px;height:2px;background:var(--text-1);border-radius:2px;transition:var(--ease)}

/* ━━━ BUTTONS ━━━ */
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;font-size:15px;font-weight:600;border-radius:12px;border:none;cursor:pointer;transition:var(--ease);font-family:var(--font)}
.btn-white{background:#fff;color:var(--blue);box-shadow:var(--shadow-md)}
.btn-white:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(0,0,0,.12)}
.btn-white.btn-lg{padding:16px 34px;font-size:16px}
.btn-glass{background:rgba(255,255,255,.15);color:#fff;border:1.5px solid rgba(255,255,255,.3);backdrop-filter:blur(10px)}
.btn-glass:hover{background:rgba(255,255,255,.25)}
.pill{display:inline-block;padding:5px 14px;background:var(--grad-light);border:1px solid rgba(74,126,245,.15);border-radius:100px;font-size:12px;font-weight:600;color:var(--blue);margin-bottom:14px}

/* ━━━ HERO ━━━ */
.hero{position:relative;padding:140px 0 120px;overflow:hidden}
.hero-bg{position:absolute;inset:0;background:var(--grad);z-index:0}
.hero-bg::after{content:'';position:absolute;inset:0;background:radial-gradient(circle at 30% 50%,rgba(255,255,255,.1),transparent 60%)}
.hero .container{position:relative;z-index:1}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.hero-content{color:#fff}
.hero-pill{display:inline-block;padding:6px 14px;background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.2);border-radius:100px;font-size:12px;font-weight:600;margin-bottom:20px;backdrop-filter:blur(10px)}
.hero h1{font-size:clamp(2.2rem,4.5vw,3.4rem);font-weight:900;line-height:1.1;margin-bottom:20px;letter-spacing:-1px}
.hero h1 span{font-weight:700;opacity:.9}
.hero-desc{font-size:16px;opacity:.85;margin-bottom:28px;max-width:480px;line-height:1.8}
.hero-btns{display:flex;gap:14px;margin-bottom:36px;flex-wrap:wrap}
.hero-stats{display:flex;gap:24px}
.hs{text-align:center}
.hs strong{display:block;font-size:22px;font-weight:800}
.hs small{font-size:11px;opacity:.7}
.hero-wave{position:absolute;bottom:-1px;left:0;right:0;z-index:1}
.hero-wave svg{display:block;width:100%}

/* Hero cards */
.hero-cards{position:relative}
.hcard{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);border-radius:var(--radius);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);overflow:hidden}
.hcard-main{box-shadow:0 20px 50px rgba(0,0,0,.15);animation:hfloat 6s ease-in-out infinite}
@keyframes hfloat{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
.hcard-top{padding:14px 18px;background:rgba(0,0,0,.15);border-bottom:1px solid rgba(255,255,255,.1);font-size:13px;color:#fff;font-weight:600}
.online{color:#4ade80;font-size:12px;margin-left:8px}
.hcard-body{padding:16px}
.hmsg{display:flex;gap:10px;margin-bottom:10px}
.hmsg.user{justify-content:flex-end}
.ha{width:28px;height:28px;background:rgba(255,255,255,.15);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:14px;flex-shrink:0}
.hb{padding:8px 12px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.15);border-radius:10px 10px 10px 3px;font-size:12px;color:rgba(255,255,255,.9);max-width:240px;line-height:1.5}
.hmsg.user .hb{background:rgba(255,255,255,.2);border-radius:10px 10px 3px 10px}
.tdots{display:inline-flex;gap:3px;margin-left:4px}
.tdots i{width:5px;height:5px;background:#fff;border-radius:50%;display:inline-block;animation:td 1.4s ease-in-out infinite}
.tdots i:nth-child(2){animation-delay:.2s}
.tdots i:nth-child(3){animation-delay:.4s}
@keyframes td{0%,80%,100%{opacity:.3;transform:scale(.8)}40%{opacity:1;transform:scale(1.2)}}
.hcard-float{position:absolute;display:inline-flex;align-items:center;gap:6px;padding:10px 16px;font-size:13px;color:#fff;font-weight:500;animation:hfm 5s ease-in-out infinite}
.hcard-bmi{top:10px;right:-10px;animation-delay:1s}
.hcard-fit{bottom:40px;left:-10px}
@keyframes hfm{0%,100%{transform:translateY(0)}50%{transform:translateY(-6px)}}

/* ━━━ FEATURES ━━━ */
.features,.hiw,.aidoc,.fit,.cta-sec{padding:90px 0}
.sec-head{text-align:center;margin-bottom:50px}
.sec-head h2{font-size:clamp(1.6rem,3vw,2.4rem);font-weight:800;margin-bottom:10px}
.sec-head p{font-size:15px;color:var(--text-2);max-width:520px;margin:0 auto}
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.fcard{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:28px;transition:var(--ease);opacity:0;transform:translateY(24px)}
.fcard.vis{opacity:1;transform:translateY(0)}
.fcard:hover{box-shadow:var(--shadow-md);transform:translateY(-4px);border-color:var(--blue)}
.fi{font-size:36px;margin-bottom:14px}
.fcard h3{font-size:17px;font-weight:700;margin-bottom:8px}
.fcard p{font-size:13px;color:var(--text-2);line-height:1.7}

/* ━━━ HOW IT WORKS ━━━ */
.hiw{background:var(--bg-soft)}
.hiw-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.hiw-step{text-align:center;padding:30px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);position:relative;transition:var(--ease);opacity:0;transform:translateY(24px)}
.hiw-step.vis{opacity:1;transform:translateY(0)}
.hiw-step:hover{box-shadow:var(--shadow-md);transform:translateY(-3px)}
.hiw-num{position:absolute;top:12px;left:16px;font-size:48px;font-weight:900;background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;opacity:.15}
.hiw-icon{font-size:40px;margin-bottom:14px}
.hiw-step h3{font-size:16px;font-weight:700;margin-bottom:8px}
.hiw-step p{font-size:13px;color:var(--text-2)}

/* ━━━ AI DOC ━━━ */
.aidoc-grid{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}
.aidoc-text h2{font-size:clamp(1.5rem,3vw,2.2rem);font-weight:800;margin-bottom:14px}
.aidoc-text p{font-size:15px;color:var(--text-2);margin-bottom:18px}
.aidoc-text,.aidoc-card{opacity:0;transform:translateY(24px);transition:var(--ease) .2s}
.aidoc-text.vis,.aidoc-card.vis{opacity:1;transform:translateY(0)}
.aidoc-list{display:flex;flex-direction:column;gap:10px;margin-bottom:18px}
.aidoc-list li{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--text-2)}
.aidoc-list i{color:var(--green)}
.warn-box{display:flex;align-items:center;gap:8px;padding:10px 14px;background:rgba(234,179,8,.06);border:1px solid rgba(234,179,8,.2);border-radius:8px;font-size:12px;color:var(--yellow)}
.dx-card,.tx-card{background:var(--bg-soft);border:1px solid var(--border);border-radius:var(--radius);padding:18px;margin-bottom:14px}
.dx-head{font-size:14px;font-weight:700;margin-bottom:10px}
.dx-row{display:flex;align-items:center;gap:8px;padding:7px 0;border-bottom:1px solid var(--border-light);font-size:13px;color:var(--text-2)}
.dx-row:last-child{border-bottom:none}
.dx-tag{padding:2px 8px;border-radius:4px;font-size:10px;font-weight:700;white-space:nowrap}
.dx-tag.hi{background:rgba(239,68,68,.08);color:var(--red)}
.dx-tag.md{background:rgba(234,179,8,.08);color:var(--yellow)}
.dx-tag.lo{background:rgba(34,197,94,.08);color:var(--green-s)}
.tx-row{font-size:13px;color:var(--text-2);padding:5px 0}

/* ━━━ FITNESS ━━━ */
.fit{background:var(--bg-soft)}
.fit-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.fitc{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:var(--ease);opacity:0;transform:translateY(24px)}
.fitc.vis{opacity:1;transform:translateY(0)}
.fitc:hover{box-shadow:var(--shadow-md);transform:translateY(-3px)}
.fitc-h{display:flex;justify-content:space-between;align-items:center;padding:14px 18px;background:var(--bg-soft);border-bottom:1px solid var(--border);font-weight:600;font-size:14px}
.ft{padding:3px 10px;border-radius:6px;font-size:11px;font-weight:700;letter-spacing:.5px}
.ft.push{background:rgba(239,68,68,.06);color:var(--red)}
.ft.pull{background:rgba(59,130,246,.06);color:var(--blue-s)}
.ft.rest{background:rgba(34,197,94,.06);color:var(--green-s)}
.fitc-b{padding:14px 18px}
.exr{padding:7px 0;border-bottom:1px solid var(--border-light);font-size:13px}
.exr:last-child{border-bottom:none}
.exr strong{display:block;font-weight:600;margin-bottom:2px}
.exr small{color:var(--blue);font-size:12px}
.fitc-f{padding:10px 18px;background:var(--bg-soft);border-top:1px solid var(--border);font-size:12px;color:var(--text-3)}
.rest-b{text-align:center;padding:24px 18px}
.rest-ico{font-size:40px;margin-bottom:10px}
.rest-b h4{color:var(--green-s);font-size:15px;margin-bottom:12px}
.rest-b .exr{border-bottom:none;text-align:left}

/* ━━━ CTA ━━━ */
.cta-sec{background:var(--bg)}
.cta-card{background:var(--grad);border-radius:20px;padding:50px;text-align:center;color:#fff;position:relative;overflow:hidden;opacity:0;transform:translateY(24px);transition:var(--ease) .2s}
.cta-card.vis{opacity:1;transform:translateY(0)}
.cta-card::before{content:'';position:absolute;top:-60px;right:-60px;width:200px;height:200px;background:rgba(255,255,255,.08);border-radius:50%}
.cta-card h2{font-size:clamp(1.4rem,3vw,2rem);font-weight:800;margin-bottom:12px;position:relative;z-index:1}
.cta-card p{font-size:15px;opacity:.85;margin-bottom:24px;position:relative;z-index:1}
.cta-card .btn{position:relative;z-index:1}
.cta-trust{display:flex;justify-content:center;gap:20px;flex-wrap:wrap;margin-top:18px;font-size:13px;opacity:.7;position:relative;z-index:1}

/* ━━━ FOOTER ━━━ */
.footer{padding:50px 0 24px;border-top:1px solid var(--border);background:var(--bg-soft)}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px;margin-bottom:30px}
.fb p{font-size:13px;color:var(--text-3)}
.fc h4{font-size:14px;font-weight:700;margin-bottom:12px}
.fc a{display:block;font-size:13px;color:var(--text-3);padding:3px 0;transition:var(--ease)}
.fc a:hover{color:var(--blue)}
.fbot{text-align:center;padding-top:24px;border-top:1px solid var(--border)}
.fbot p{font-size:13px;color:var(--text-3);margin-bottom:6px}
.fbot a{color:var(--blue)}
.fbot small{font-size:11px;color:var(--yellow);opacity:.7}

/* ━━━ RESPONSIVE ━━━ */
@media(max-width:1024px){
    .hero-grid,.aidoc-grid{grid-template-columns:1fr;gap:40px}
    .hero-cards{max-width:450px}
    .feat-grid,.hiw-grid,.fit-grid{grid-template-columns:repeat(2,1fr)}
    .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
    .nav-links,.nav-actions{display:none}
    .nav-toggle{display:flex}
    .nav-links.open{display:flex;flex-direction:column;position:absolute;top:100%;left:0;right:0;background:rgba(255,255,255,.97);backdrop-filter:blur(20px);padding:20px 24px;gap:14px;border-bottom:1px solid var(--border)}
    .nav-links.open .nav-links-mobile-auth{display:flex;flex-direction:column;gap:10px;margin-top:8px;padding-top:14px;border-top:1px solid var(--border)}
    .nav-links.open .nav-links-mobile-auth .btn-login{text-align:center;padding:10px;background:var(--bg-soft);border-radius:10px;font-weight:600;color:var(--text-1)}
    .nav-links.open .nav-links-mobile-auth .btn-cta{text-align:center;display:block}
    .hero{padding:120px 0 100px}
    .feat-grid,.hiw-grid,.fit-grid{grid-template-columns:1fr}
    .cta-card{padding:36px 20px}
    .footer-grid{grid-template-columns:1fr}
    .hcard-float{display:none}
}
@media(max-width:480px){
    .hero-btns{flex-direction:column}
    .btn{width:100%;justify-content:center}
    .hero-stats{justify-content:center;gap:16px}
}