/* ==========================================================
   Hằng Tín – main.css
   MOBILE-FIRST: phần gốc dưới đây = frame "Mobile / *" (390px) của Figma,
   đo từng px. Desktop (>=1024px) nằm riêng ở cuối file, KHÔNG suy ra từ mobile.
   Token theo Figma: collection "Hằng Tín / Color".
   ========================================================== */
:root{
  --navy:#071b35; --gold:#c99b4d; --bronze:#8a5e14;
  --cream:#f2f0eb; --paper:#f7f4ee; --sand:#e6e3dc; --card:#f5f2eb; --form:#faf9f6;
  --ink:#15191b; --ink-2:#4a5054; --ink-3:#5f6468; --ink-4:#525860;
  --line:#d9d5cc; --line-2:#d6d1c7; --line-3:#b7b2a7;
  --dark:#15191b; --dark-2:#1a2026; --dark-line:#2d343c; --dark-text:#a8afb8; --footer:#121619; --footer-line:#2a3036; --footer-text:#9ca3af;
  --font:"Mona Sans",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--cream);color:var(--ink);font-family:var(--font);font-size:16px;line-height:24px;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4,p,ul,ol,dl,dd,figure{margin:0;padding:0}
ul,ol{list-style:none}
button,input,textarea{font:inherit;color:inherit}
body.menu-open{overflow:hidden}

/* ---------- Header (390x64) ---------- */
.site-header{position:sticky;top:0;z-index:50;height:64px;display:flex;align-items:center;gap:8px;padding:0 20px;background:var(--cream);border-bottom:1px solid var(--line)}
.site-logo{display:block;width:78px;height:46px;flex:none}
.site-logo img{width:78px;height:46px;object-fit:contain}
.site-logo__img{display:block;width:78px;height:46px;background:url(../img/logo.png) 0 -3px/78px auto no-repeat}
.site-logo__text{display:flex;align-items:center;height:46px;font-weight:700;font-size:15px;letter-spacing:.02em;color:var(--navy)}
.site-header__spacer{flex:1}
.desktop-nav{display:none}
.menu-btn{width:95px;height:44px;display:flex;align-items:center;justify-content:center;gap:8px;padding:0 12px;background:var(--navy);border:1px solid var(--gold);color:var(--paper);font-size:16px;line-height:24px;font-weight:500;cursor:pointer;border-radius:0}
.menu-btn__bars{width:18px;height:14px;display:flex;flex-direction:column;justify-content:space-between}
.menu-btn__bars i{display:block;height:2px;background:var(--gold)}
.menu-btn__x{display:none}
.menu-btn[aria-expanded="true"]{width:90px;background:var(--cream);border-color:var(--line);color:var(--ink)}
.menu-btn[aria-expanded="true"] .menu-btn__bars{display:none}
.menu-btn[aria-expanded="true"] .menu-btn__x{display:block}

/* ---------- Menu mở (390x696 dưới header) ---------- */
.mobile-menu{position:fixed;inset:64px 0 0 0;z-index:49;background:var(--cream);overflow:auto;padding:8px 20px 32px}
.mobile-menu[hidden]{display:none}
.mobile-menu__nav a{display:flex;align-items:center;height:64px;font-size:24px;line-height:30px;font-weight:500;color:var(--navy);border-bottom:1px solid var(--line)}
.mobile-menu__lang{display:flex;align-items:center;justify-content:space-between;height:72px;font-size:16px;color:var(--ink-2)}
.lang-switch{display:flex;height:44px}
.lang-switch a{display:flex;align-items:center;justify-content:center;width:65px;border:1px solid var(--line-3);font-size:14px;font-weight:600;color:var(--ink)}
.lang-switch a.is-active{background:var(--navy);border-color:var(--navy);color:var(--paper)}
.mobile-menu__cta{display:flex;flex-direction:column;gap:12px;padding-top:32px}
.mobile-menu__cta p{font-size:14px;line-height:20px;color:var(--ink-3)}

/* ---------- Button (52px) ---------- */
.btn{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;height:52px;padding:0 12px;font-size:16px;line-height:24px;font-weight:500;color:var(--paper);border:1px solid transparent;cursor:pointer;background:none}
.btn--gold{background:var(--gold)}
.btn--navy,.btn--navy-gold{background:var(--navy)}
.btn--navy-gold{border-color:var(--gold)}
.btn--navy-ink{background:var(--navy);border-color:#101010}
.btn .ico-arrow{flex:none}
.btn--submit{font-size:14px;line-height:20px;font-weight:600;color:#fff}

/* ---------- Section chung ---------- */
.sec{padding:40px 20px;display:flex;flex-direction:column;gap:24px}
.sec h2,.fdi h2,.vision h2{font-size:24px;line-height:30px;font-weight:500;color:var(--ink)}
.eyebrow{font-size:14px;line-height:20px;font-weight:600}
.eyebrow--gold{color:var(--gold)}
.eyebrow--bronze{color:var(--bronze)}
.ph{background:linear-gradient(135deg,#d3cec2,#bdb7a8);width:100%}

/* ---------- Hero (390x537) ---------- */
.hero{display:flex;flex-direction:column;gap:20px;padding:120px 20px 24px;background:linear-gradient(rgba(0,0,0,.56),rgba(0,0,0,.56)),var(--navy) url(../img/hero-m.jpg) center/cover no-repeat;border:1px solid var(--gold)}
.hero h1{font-size:32px;line-height:38px;font-weight:500;letter-spacing:-.015em;color:var(--paper)}
.hero__lead{color:var(--gold)}
.hero__btns{display:flex;flex-direction:column;gap:12px;padding:4px 0 12px}
.hero__facts{display:flex;gap:16px}
.hero__facts>div{flex:1;display:flex;flex-direction:column;justify-content:center;gap:2px;padding:14px 0;border-top:1px solid #6b7377;min-height:75px}
.hero__facts span{font-size:14px;line-height:20px;color:var(--gold)}
.hero__facts strong{font-size:16px;line-height:24px;font-weight:500;color:#fff}

/* ---------- Giới thiệu (794) ---------- */
.sec--intro h2{color:var(--navy)}
.img-intro,.img-svc{width:100%;object-fit:cover}
.img-intro{height:300px}
.stats{display:grid;grid-template-columns:1fr 1fr;column-gap:16px}
.stat{display:flex;flex-direction:column;gap:4px;padding-top:16px;border-top:1px solid var(--line-3);min-height:115px}
.stat b{font-size:32px;line-height:38px;font-weight:500;letter-spacing:-.015em;color:var(--navy)}
.stat span{font-size:14px;line-height:20px;color:var(--ink-3)}

/* ---------- Dịch vụ accordion ---------- */
.svc-acc{border-top:0}
.svc-acc__item{border-bottom:1px solid var(--line-3)}
.svc-acc__head{display:flex;align-items:center;width:100%;min-height:66px;padding:20px 0;background:none;border:0;text-align:left;cursor:pointer;font-size:20px;line-height:26px;font-weight:600;color:var(--ink)}
.svc-acc__head span{flex:1}
.svc-acc__head .ico-chev{flex:none;margin-right:0}
.svc-acc__item.is-open .svc-acc__head{color:var(--navy)}
.svc-acc__item.is-open .ico-chev{display:none}
.svc-acc__body{display:none;flex-direction:column;gap:16px;padding-bottom:25px}
.svc-acc__item.is-open .svc-acc__body{display:flex}
.img-svc{height:260px}
.svc-acc__body p{color:var(--ink-2)}

/* ---------- Dự án tiêu biểu ---------- */
.sec--projects{background:var(--sand)}
.tiles{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.tile{position:relative;display:block;height:250px;background:#3a4450 center/cover no-repeat;overflow:hidden}
.tile::before{content:"";position:absolute;inset:0;background:rgba(10,13,18,.44)}
.tile::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(8,10,15,0) 0,rgba(8,10,15,.18) 60%,rgba(8,10,15,.72) 100%)}
.tile span{position:absolute;z-index:1;left:12px;right:12px;bottom:10px;font-size:16px;line-height:24px;color:var(--paper)}

/* ---------- FDI & Quy trình ---------- */
.fdi{background:var(--dark);padding:40px 20px}
.fdi h2{color:var(--paper);margin-top:4px}
.fdi__lead{margin-top:12px;font-size:14px;line-height:20px;color:var(--dark-text)}
.fdi__points{margin-top:16px;display:flex;flex-direction:column;gap:8px}
.fdi__points li{position:relative;display:flex;align-items:center;min-height:56px;padding:15.5px 16px 15.5px 48px;background:var(--dark-2);border:1px solid var(--dark-line)}
.fdi__points li::before{content:"";position:absolute;left:-1px;top:-1px;bottom:-1px;width:3px;background:var(--gold)}
.fdi__points b{position:absolute;left:16px;top:50%;transform:translateY(-50%);font-size:14px;line-height:20px;font-weight:600;color:var(--gold)}
.fdi__points span{font-size:14px;line-height:20px;font-weight:500;color:var(--paper)}
.fdi__rule{height:1px;border:0;background:var(--dark-line);margin:24px 0 23px}
.fdi .eyebrow+h2{margin-top:12px;margin-bottom:18px}
.fdi h2:first-of-type{margin:4px 0 0}
.steps{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.step{position:relative;display:flex;flex-direction:column;gap:6px;height:98px;padding:14px 14px 0;background:var(--dark-2);border:1px solid var(--dark-line)}
.step::before{content:"";position:absolute;left:-1px;right:-1px;top:-1px;height:2px;background:var(--navy)}
.step.is-first::before{background:var(--gold)}
.step b{font-size:14px;line-height:20px;font-weight:600;color:var(--gold)}
.step span{font-size:14px;line-height:20px;color:var(--dark-text)}

/* ---------- Định vị / Tầm nhìn / Sứ mệnh ---------- */
.vision{padding:40px 20px 39px;border-top:1px solid var(--line-2)}
.vision h2{margin-top:4px;color:var(--navy);margin-bottom:24px}
.vcard{position:relative;display:flex;flex-direction:column;padding:18px 18px 24px;height:240px;background:var(--card);border:1px solid var(--line-2)}
.vcard+.vcard{margin-top:16px}
.vcard+.vcard+.vcard{margin-top:8px}
.vcard::before{content:"";position:absolute;left:-1px;right:-1px;top:-1px;height:3px;background:var(--gold)}
.vcard__kicker{font-size:14px;line-height:20px;font-weight:600;color:var(--bronze)}
.vcard h3{margin-top:4px;font-size:20px;line-height:26px;font-weight:600;color:var(--navy)}
.vcard__text{margin-top:2px;font-size:14px;line-height:20px;color:var(--ink-4)}
.vcard hr{height:1px;border:0;background:var(--line-2);margin:6px 0 13px;flex:none}
.vcard__tag{font-size:14px;line-height:20px;font-weight:500;color:var(--bronze)}
.vcard--dark{height:206px;padding-bottom:10px;background:var(--navy);border-color:var(--gold)}
.vcard--dark .vcard__kicker,.vcard--dark .vcard__tag{color:var(--gold)}
.vcard--dark h3{color:var(--paper)}
.vcard--dark .vcard__text{color:var(--dark-text)}
.vcard--dark hr{background:var(--dark-line)}

/* ---------- Form (CTA) ---------- */
.cta{background:var(--sand);padding:32px 20px;display:flex;flex-direction:column;gap:24px}
.cta h2{font-size:24px;line-height:30px;font-weight:500;color:#121619}
.form-box{display:flex;flex-direction:column;gap:16px;padding:20px;background:var(--form);border:1px solid var(--line)}
.field{display:flex;flex-direction:column;gap:4px}
.field>span{font-size:14px;line-height:20px;font-weight:500;color:var(--ink)}
.field input,.field textarea,.file{width:100%;height:48px;padding:14px;background:#fff;border:1px solid #c0c0c0;border-radius:0;font-size:14px;line-height:20px;color:var(--ink);outline:0}
.field textarea{height:96px;resize:none}
.field input::placeholder,.field textarea::placeholder{color:var(--ink-3);opacity:1}
.field input:focus,.field textarea:focus{border-color:var(--navy)}
.file{display:flex;align-items:center;justify-content:space-between;cursor:pointer}
.file em{font-style:normal;color:var(--ink-3)}
.file strong{font-weight:600;color:var(--bronze)}
.form-msg{padding:12px 14px;font-size:14px;line-height:20px;border:1px solid}
.form-msg--error{background:#fdf1ef;border-color:#c0392b;color:#8f2a1f}
.form-msg--ok{background:#eef6ee;border-color:#3d7a45;color:#26502c}

/* ---------- Góc nhìn nhà máy ---------- */
.news-list{display:flex;flex-direction:column;gap:32px}
.news-card{display:flex;flex-direction:column;gap:10px}
.news-card img,.ph--news{width:100%;height:230px;object-fit:cover}
.news-card__cap{font-size:14px;line-height:20px;color:var(--bronze)}
.news-card h3{font-size:20px;line-height:26px;font-weight:600;color:var(--ink)}

/* ---------- Footer (390x587) ---------- */
.site-footer{position:relative;background:var(--footer);padding:31px 20px 36px;border-top:1px solid var(--footer-line);color:var(--footer-text);font-size:14px;line-height:20px}
.footer__brand{display:flex;gap:16px}
.footer__logo{flex:none;width:96px;height:96px}
.footer__logo img{width:96px;height:96px;object-fit:contain}
.footer__logo span{font-weight:700;color:var(--navy)}
.footer__tagline{padding-top:5px;margin-right:-8px}
.footer__tagline strong{display:block;font-weight:600;color:var(--gold)}
.footer__tagline p{margin-top:8px}
.footer__company{margin-top:16px;padding-bottom:16px;border-bottom:1px solid var(--footer-line)}
.footer__company p{margin-top:0}
.footer__name{font-weight:600;color:var(--paper)}
.footer__name-zh{margin-top:4px}
.footer__company p:nth-child(3){margin-top:8px}
.footer__company p:nth-child(4){margin-top:2px}
.footer__cols{display:grid;grid-template-columns:167px 1fr;column-gap:16px;padding:19px 0 9px;border-bottom:1px solid var(--footer-line)}
.footer__cols h4{font-size:14px;line-height:20px;font-weight:600;color:var(--gold);margin-bottom:12px}
.footer__cols a{display:block;margin-bottom:8px;color:var(--paper)}
.footer__bottom{padding-top:23px;display:flex;flex-direction:column;gap:8px}


/* markup riêng cho mobile / desktop (hai bản dựng tách biệt theo Figma) */
.only-d{display:none}

/* Bề mặt trình duyệt: focus bàn phím + bôi chọn theo palette (không đổi bố cục) */
:focus-visible{outline:2px solid var(--gold);outline-offset:3px}
.site-footer :focus-visible,.fdi :focus-visible,.hero :focus-visible,.d-sec--dark :focus-visible,.d-footer :focus-visible{outline-color:#eeebe4}
::selection{background:var(--navy);color:var(--paper)}