/* ==========================================================================
   THÉP VIỆT MECH — Cơ khí chính xác · gia công CNC · kết cấu thép (B2B)
   Bố cục: header 2 tầng (utility bar + nav vuông) × hero chia đôi chéo
   (clip-path) × body kiểu "hồ sơ năng lực": bảng thông số máy, dự án lọc
   theo ngành, quy trình đánh số vuông, form RFQ có upload bản vẽ.
   Font: Oswald (tiêu đề nén) + Roboto. Màu: thép #1C2530 + cam an toàn #F05A28.
   ========================================================================== */
:root{
  --steel:#1C2530; --steel-2:#2A3644; --orange:#F05A28; --orange-deep:#C8461B;
  --gray:#E9EDF1; --gray-2:#F5F7F9; --line:#D5DBE2; --text:#1F2933; --muted:#5B6773;
  --ph:#B9C2CC; --ff-h:'Oswald',Impact,sans-serif; --ff:'Roboto',Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--ff);color:var(--text);background:#fff;line-height:1.6;font-size:15.5px}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
h1,h2,h3,h4{font-family:var(--ff-h);font-weight:600;line-height:1.1;letter-spacing:.01em;text-transform:uppercase}
.container{width:min(1200px,92%);margin:0 auto}
.ph{background:var(--img,var(--ph)) center/cover no-repeat}
svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}

/* ---------- Buttons (vuông, không bo) ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 24px;font-family:var(--ff-h);font-size:15px;text-transform:uppercase;letter-spacing:.06em;border:2px solid transparent;cursor:pointer;transition:.2s}
.btn--orange{background:var(--orange);color:#fff}.btn--orange:hover{background:var(--orange-deep)}
.btn--steel{background:var(--steel);color:#fff}.btn--steel:hover{background:var(--steel-2)}
.btn--line{border-color:#fff;color:#fff}.btn--line:hover{background:#fff;color:var(--steel)}
.btn--line-dark{border-color:var(--steel);color:var(--steel)}.btn--line-dark:hover{background:var(--steel);color:#fff}
.btn--lg{padding:16px 32px;font-size:17px}

/* ---------- Header 2 tầng ---------- */
.topbar{background:var(--steel);color:#B9C2CC;font-size:13px}
.topbar__in{display:flex;justify-content:space-between;align-items:center;height:36px}
.topbar__in span{display:inline-flex;align-items:center;gap:6px;margin-right:22px}
.topbar__in svg{width:14px;height:14px}
.topbar__in b{color:#fff;font-weight:500}
.header{background:#fff;border-bottom:3px solid var(--orange);position:sticky;top:0;z-index:50}
.header__in{display:flex;align-items:center;height:76px;gap:30px}
.logo{display:flex;align-items:center;gap:10px;font-family:var(--ff-h);font-size:22px;text-transform:uppercase;letter-spacing:.04em;color:var(--steel)}
.logo__mark{width:40px;height:40px;background:var(--steel);color:var(--orange);display:grid;place-items:center;font-size:20px;font-weight:700}
.logo small{display:block;font-family:var(--ff);font-size:10px;letter-spacing:.2em;color:var(--muted);line-height:1}
.nav{display:flex;margin-left:auto;height:100%}
.nav a{display:flex;align-items:center;padding:0 16px;font-family:var(--ff-h);font-size:15px;text-transform:uppercase;letter-spacing:.06em;color:var(--steel);border-bottom:3px solid transparent;margin-bottom:-3px}
.nav a:hover,.nav a.is-active{border-color:var(--steel)}
.header .btn{margin-left:10px}
.burger{display:none;background:none;border:0;cursor:pointer;color:var(--steel);margin-left:auto}
.burger svg{width:28px;height:28px}

/* ---------- Hero chia đôi chéo ---------- */
.hero{position:relative;background:var(--steel);color:#fff;min-height:600px;display:grid;grid-template-columns:1.05fr 1fr;overflow:hidden}
.hero__txt{padding:90px 0 90px;position:relative;z-index:2}
.hero__txt .container{width:min(1200px,92%);margin-left:max(4%,calc((100% - 1200px)/2 + 0px));margin-right:0;max-width:600px}
.hero__kicker{display:inline-flex;align-items:center;gap:10px;color:var(--orange);font-family:var(--ff-h);text-transform:uppercase;letter-spacing:.2em;font-size:13px;margin-bottom:18px}
.hero__kicker::before{content:"";width:34px;height:3px;background:var(--orange)}
.hero h1{font-size:clamp(40px,5.2vw,68px);line-height:1;margin-bottom:22px}
.hero h1 em{font-style:normal;color:var(--orange)}
.hero p{color:#C4CCD5;font-size:17px;max-width:520px;margin-bottom:30px}
.hero__cta{display:flex;gap:12px;flex-wrap:wrap}
.hero__img{position:relative;clip-path:polygon(14% 0,100% 0,100% 100%,0 100%)}
.hero__img .ph{position:absolute;inset:0}
.hero__img::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(28,37,48,.35),transparent 40%)}
.hero__specs{display:flex;gap:0;margin-top:44px;border:1px solid rgba(255,255,255,.15)}
.hero__specs div{flex:1;padding:16px 18px;border-right:1px solid rgba(255,255,255,.15)}
.hero__specs div:last-child{border-right:0}
.hero__specs b{display:block;font-family:var(--ff-h);font-size:28px;color:#fff;line-height:1}
.hero__specs span{font-size:12px;color:#A3ADB8;text-transform:uppercase;letter-spacing:.08em}

/* ---------- Dải ngành phục vụ ---------- */
.inds{background:var(--orange);color:#fff}
.inds__in{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px 20px;padding:16px 0;font-family:var(--ff-h);text-transform:uppercase;letter-spacing:.1em;font-size:14px}
.inds__in span::before{content:"■";font-size:9px;margin-right:8px;vertical-align:middle}

/* ---------- Sections ---------- */
.section{padding:90px 0}
.section--gray{background:var(--gray-2)}
.section--steel{background:var(--steel);color:#fff}
.section__head{display:flex;justify-content:space-between;align-items:flex-end;gap:30px;margin-bottom:44px;flex-wrap:wrap}
.section__kicker{color:var(--orange);font-family:var(--ff-h);text-transform:uppercase;letter-spacing:.2em;font-size:13px;display:block;margin-bottom:8px}
.section__title{font-size:clamp(30px,3.6vw,46px)}
.section__head p{color:var(--muted);max-width:480px}
.section--steel .section__head p{color:#A3ADB8}

/* ---------- Dịch vụ: hàng ngang có số ---------- */
.svcs{display:grid;grid-template-columns:repeat(4,1fr);gap:2px;background:var(--line)}
.svc{background:#fff;padding:34px 28px 30px;position:relative;transition:.2s}
.svc:hover{background:var(--steel);color:#fff}
.svc:hover p{color:#B9C2CC}
.svc__no{font-family:var(--ff-h);font-size:48px;color:var(--gray);line-height:1;position:absolute;right:20px;top:14px}
.svc:hover .svc__no{color:rgba(255,255,255,.12)}
.svc svg{width:38px;height:38px;color:var(--orange);margin-bottom:18px;stroke-width:1.6}
.svc h3{font-size:22px;margin-bottom:10px}
.svc p{color:var(--muted);font-size:14.5px}
.svc a{display:inline-block;margin-top:16px;font-family:var(--ff-h);text-transform:uppercase;letter-spacing:.1em;font-size:13px;color:var(--orange)}

/* ---------- Bảng thông số máy ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--line)}
table.spec{width:100%;border-collapse:collapse;font-size:14.5px;min-width:760px;background:#fff}
.spec th{background:var(--steel);color:#fff;font-family:var(--ff-h);font-weight:500;text-transform:uppercase;letter-spacing:.08em;font-size:13px;text-align:left;padding:14px 16px}
.spec td{padding:14px 16px;border-bottom:1px solid var(--line);vertical-align:top}
.spec tr:nth-child(even) td{background:var(--gray-2)}
.spec td b{font-family:var(--ff-h);font-weight:500;font-size:16px;text-transform:uppercase}
.spec .qty{font-family:var(--ff-h);font-size:20px;color:var(--orange)}
.mach{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:34px}
.mach__card{border:1px solid var(--line);background:#fff}
.mach__card .ph{aspect-ratio:4/3}
.mach__card div{padding:18px 20px}
.mach__card h3{font-size:20px}
.mach__card small{color:var(--muted);display:block;margin-top:4px}
.mach__card dl{display:grid;grid-template-columns:auto 1fr;gap:4px 12px;margin-top:12px;font-size:13.5px}
.mach__card dt{color:var(--muted)}.mach__card dd{font-weight:500}

/* ---------- Dự án lọc theo ngành ---------- */
.filter{display:flex;gap:2px;flex-wrap:wrap;margin-bottom:30px;border:1px solid var(--line);padding:2px;background:#fff;width:fit-content}
.filter button{background:none;border:0;padding:10px 18px;font-family:var(--ff-h);text-transform:uppercase;letter-spacing:.08em;font-size:13.5px;cursor:pointer;color:var(--muted)}
.filter button.is-active{background:var(--steel);color:#fff}
.projs{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.proj{position:relative;background:var(--steel);color:#fff;overflow:hidden}
.proj .ph{aspect-ratio:4/3;transition:.4s}
.proj:hover .ph{transform:scale(1.05);opacity:.7}
.proj__tag{position:absolute;left:0;top:18px;background:var(--orange);padding:5px 12px;font-family:var(--ff-h);text-transform:uppercase;letter-spacing:.1em;font-size:12px}
.proj__body{padding:18px 20px 20px}
.proj h3{font-size:20px}
.proj p{color:#A3ADB8;font-size:13.5px;margin-top:6px}
.proj__meta{display:flex;gap:18px;margin-top:12px;font-size:12.5px;color:#C4CCD5;border-top:1px solid rgba(255,255,255,.12);padding-top:12px}
.proj__meta b{font-family:var(--ff-h);font-weight:500;color:#fff;font-size:15px;display:block}
.proj.is-hidden{display:none}

/* ---------- Quy trình: số vuông nối vạch ---------- */
.proc{display:grid;grid-template-columns:repeat(5,1fr);gap:0;counter-reset:st}
.proc__step{padding:0 22px 0 0;position:relative}
.proc__step::before{counter-increment:st;content:"0" counter(st);display:grid;place-items:center;width:56px;height:56px;background:var(--orange);color:#fff;font-family:var(--ff-h);font-size:22px;margin-bottom:18px}
.proc__step::after{content:"";position:absolute;top:27px;left:56px;right:0;height:2px;background:rgba(255,255,255,.18)}
.proc__step:last-child::after{display:none}
.proc__step h3{font-size:19px;margin-bottom:6px}
.proc__step p{color:#A3ADB8;font-size:13.5px}

/* ---------- Chứng chỉ + về chúng tôi ---------- */
.about{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.about__imgs{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.about__imgs .ph{aspect-ratio:1}
.about__imgs .ph:first-child{grid-column:1/-1;aspect-ratio:16/9}
.about h2{font-size:clamp(28px,3.2vw,40px);margin-bottom:16px}
.about p{color:var(--muted);margin-bottom:12px}
.certs{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}
.cert{border:2px solid var(--steel);padding:8px 14px;font-family:var(--ff-h);text-transform:uppercase;letter-spacing:.08em;font-size:13px}
.cert b{color:var(--orange);margin-right:4px}

/* ---------- Số liệu ---------- */
.nums{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);background:#fff}
.num{padding:34px 26px;border-right:1px solid var(--line)}
.num:last-child{border-right:0}
.num b{font-family:var(--ff-h);font-size:48px;color:var(--steel);line-height:1;display:block}
.num b i{font-style:normal;color:var(--orange)}
.num span{color:var(--muted);font-size:14px;text-transform:uppercase;letter-spacing:.08em}

/* ---------- Khách hàng ---------- */
.clients{display:grid;grid-template-columns:repeat(6,1fr);gap:2px;background:var(--line)}
.clients span{background:#fff;display:grid;place-items:center;height:80px;font-family:var(--ff-h);font-size:16px;letter-spacing:.1em;color:#8A94A0;text-transform:uppercase}

/* ---------- RFQ form ---------- */
.rfq{display:grid;grid-template-columns:1fr 1.5fr;gap:60px}
.rfq__info h2{font-size:clamp(28px,3.2vw,40px);margin-bottom:14px}
.rfq__info p{color:#A3ADB8;margin-bottom:22px}
.rfq__info ul li{display:flex;gap:12px;padding:12px 0;border-top:1px solid rgba(255,255,255,.12);font-size:14.5px}
.rfq__info ul li svg{color:var(--orange);flex:none;margin-top:3px}
.form{background:#fff;color:var(--text);padding:36px}
.form h3{font-size:22px;margin-bottom:20px}
.form__grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{display:flex;flex-direction:column;gap:6px}
.field--full{grid-column:1/-1}
.field label{font-size:12.5px;text-transform:uppercase;letter-spacing:.08em;font-weight:500;color:var(--muted)}
.field input,.field select,.field textarea{border:1px solid var(--line);padding:12px 14px;font:inherit;font-size:14.5px;background:var(--gray-2);border-radius:0}
.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid var(--orange);border-color:var(--orange);background:#fff}
.field textarea{min-height:110px;resize:vertical}
.upload{border:2px dashed var(--line);padding:22px;text-align:center;color:var(--muted);font-size:14px;background:var(--gray-2)}
.upload input{display:none}
.upload label{cursor:pointer;display:block}
.upload b{display:block;color:var(--steel);font-family:var(--ff-h);text-transform:uppercase;letter-spacing:.08em;font-weight:500;margin-bottom:4px}
.form .btn{margin-top:20px;width:100%;justify-content:center}

/* ---------- Trang con ---------- */
.pagehead{background:var(--steel);color:#fff;padding:60px 0 50px;position:relative;overflow:hidden}
.pagehead::after{content:"";position:absolute;right:-60px;top:-60px;width:320px;height:320px;border:40px solid rgba(255,255,255,.04);transform:rotate(45deg)}
.pagehead .crumb{font-size:13px;color:#A3ADB8;margin-bottom:12px;text-transform:uppercase;letter-spacing:.1em}
.pagehead h1{font-size:clamp(36px,4.6vw,58px)}
.pagehead p{color:#C4CCD5;max-width:600px;margin-top:12px}

/* ---------- Dịch vụ chi tiết (trang gia-cong) ---------- */
.svc-row{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center;padding:50px 0;border-bottom:1px solid var(--line)}
.svc-row:nth-child(even) .svc-row__img{order:2}
.svc-row__img .ph{aspect-ratio:4/3}
.svc-row h2{font-size:32px;margin-bottom:12px}
.svc-row h2 span{color:var(--orange);display:block;font-size:14px;letter-spacing:.2em;margin-bottom:6px}
.svc-row p{color:var(--muted);margin-bottom:14px}
.svc-row ul{display:grid;grid-template-columns:1fr 1fr;gap:6px 16px;font-size:14px}
.svc-row ul li::before{content:"▸";color:var(--orange);margin-right:6px}

/* ---------- Liên hệ ---------- */
.contact{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.contact__box{border:1px solid var(--line);padding:26px;background:#fff}
.contact__box h3{font-size:18px;margin-bottom:8px;display:flex;gap:10px;align-items:center}
.contact__box h3 svg{color:var(--orange)}
.contact__box p{color:var(--muted);font-size:14.5px}
.map{background:var(--gray);aspect-ratio:16/9;display:grid;place-items:center;color:var(--muted);font-family:var(--ff-h);text-transform:uppercase;letter-spacing:.1em}

/* ---------- Footer ---------- */
.footer{background:#0F161E;color:#8A94A0;font-size:14px}
.footer__grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px;padding:60px 0 40px}
.footer .logo{color:#fff;margin-bottom:14px}
.footer .logo small{color:#8A94A0}
.footer h4{color:#fff;font-size:15px;letter-spacing:.14em;margin-bottom:14px}
.footer__col a{display:block;padding:4px 0}
.footer__col a:hover{color:#fff}
.footer__bar{border-top:1px solid rgba(255,255,255,.08);padding:18px 0;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;font-size:13px}

/* ---------- Responsive ---------- */
@media (max-width:1100px){.svcs{grid-template-columns:repeat(2,1fr)}.proc{grid-template-columns:repeat(3,1fr);gap:30px 0}.proc__step:nth-child(3)::after{display:none}.clients{grid-template-columns:repeat(3,1fr)}}
@media (max-width:980px){.nav,.header>.container>.btn{display:none}.burger{display:block}.nav.is-open{display:flex;flex-direction:column;position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:3px solid var(--orange);height:auto;padding:10px 0}.nav.is-open a{padding:12px 6%;border:0}.hero{grid-template-columns:1fr}.hero__img{clip-path:none;min-height:320px;order:-1}.hero__txt{padding:50px 0}.hero__txt .container{margin:0 auto;max-width:none}.mach,.projs{grid-template-columns:repeat(2,1fr)}.about,.rfq,.svc-row,.contact{grid-template-columns:1fr}.svc-row:nth-child(even) .svc-row__img{order:0}.nums{grid-template-columns:repeat(2,1fr)}.num:nth-child(2){border-right:0}.num:nth-child(-n+2){border-bottom:1px solid var(--line)}.footer__grid{grid-template-columns:1fr 1fr}.topbar__in span:nth-child(3){display:none}}
@media (max-width:640px){.section{padding:60px 0}.svcs,.mach,.projs,.footer__grid,.form__grid,.nums{grid-template-columns:1fr}.num{border-right:0;border-bottom:1px solid var(--line)}.proc{grid-template-columns:1fr}.proc__step::after{display:none}.hero__specs{flex-direction:column}.hero__specs div{border-right:0;border-bottom:1px solid rgba(255,255,255,.15)}.form{padding:24px}.topbar__in span:not(:first-child){display:none}.clients{grid-template-columns:repeat(2,1fr)}.svc-row ul{grid-template-columns:1fr}}