/* ============================================================
   SYBA Engineering Technology — shared design system CSS
   Built on the BB Summity (bbs.co.tz) template: same tokens,
   components and spacing, re-coloured to the SYBA logo blue.
   Used by: index.html, mining.html, communications.html,
   networks.html, electrical.html.
   Editing this file changes all 5 pages at once.
   ============================================================ */

/* Layout: fixed glass nav, full-width sections with clamp() gutters,
   hairline-divided card grids, white single-theme look (as BBS). */
:root{
  --ink:#0B1220;
  --ink-2:#111A2C;
  --steel:#FFFFFF;
  --steel-2:#F2F5F8;
  --white:#FFFFFF;
  --slate:#445063;
  --amber:#0B5C9E;   /* SYBA blue, sampled from the logo (kept var name for BBS parity) */
  --amber-hi:#1F78C1;
  --teal:#13294B;    /* SYBA navy, from the profile headings */
  --teal-hi:#1F3F6E;
  --line-dark:rgba(11,18,32,0.10);
  --line-light:rgba(11,18,32,0.10);
  --ease:cubic-bezier(.22,.61,.36,1);
  --gutter:clamp(20px,6vw,80px);
  --font-sans:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Helvetica Neue",Helvetica,Arial,sans-serif;
  color-scheme:light;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;scroll-padding-top:84px;}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;}
}
body{margin:0;background:var(--white);color:var(--ink);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;overflow-x:hidden;}
h1,h2,h3,h4,.display{font-family:var(--font-sans);font-weight:600;letter-spacing:-0.01em;margin:0;text-wrap:balance;}
p{margin:0;}
a{color:inherit;text-decoration:none;}
svg{display:block;max-width:100%;}
img{max-width:100%;}
button{font-family:inherit;cursor:pointer;}
:focus-visible{outline:2px solid var(--amber);outline-offset:3px;}
.eyebrow{font-family:var(--font-sans);font-size:0.7rem;text-transform:uppercase;letter-spacing:0.16em;opacity:0.6;}

/* ---------- Nav ---------- */
header.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:12px clamp(20px,4vw,56px);
  padding-top:calc(12px + env(safe-area-inset-top,0px));
  background:rgba(255,255,255,0.88);backdrop-filter:blur(14px) saturate(140%);-webkit-backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid transparent;color:var(--ink);
  transition:border-color .3s,box-shadow .3s,background .3s;
}
header.nav.is-scrolled{border-bottom-color:var(--line-light);box-shadow:0 8px 30px -20px rgba(11,18,32,0.35);}
.nav-logo{display:flex;align-items:center;gap:10px;flex:none;}
.nav-logo img{height:46px;width:auto;display:block;}
.nav-links{display:flex;gap:26px;list-style:none;margin:0;padding:0;}
.nav-links a{font-size:0.85rem;opacity:0.72;transition:opacity 0.2s;position:relative;white-space:nowrap;}
.nav-links a:hover,.nav-links a[aria-current="page"]{opacity:1;}
.nav-links a::after{content:"";position:absolute;left:0;right:100%;bottom:-4px;height:1px;background:currentColor;transition:right .25s var(--ease);}
.nav-links a:hover::after,.nav-links a[aria-current="page"]::after{right:0;}
.nav-right{display:flex;align-items:center;gap:12px;}
.nav-cta{
  font-size:0.82rem;border:1px solid var(--line-light);padding:9px 18px;border-radius:6px;white-space:nowrap;
  transition:border-color 0.2s,background 0.2s;
}
.nav-cta:hover{border-color:var(--amber);background:rgba(11,92,158,0.08);}
.nav-toggle{display:none;width:40px;height:40px;border:1px solid var(--line-light);border-radius:6px;background:transparent;color:var(--ink);align-items:center;justify-content:center;}
.nav-toggle svg{width:18px;height:18px;}
.mobile-menu{display:none;}
@media (max-width:1020px){
  .nav-links{display:none;}
  .nav-toggle{display:inline-flex;}
  .mobile-menu{
    display:block;position:fixed;left:0;right:0;top:70px;z-index:99;
    background:var(--white);border-bottom:1px solid var(--line-light);
    box-shadow:0 20px 40px -24px rgba(11,18,32,0.35);
    padding:8px clamp(20px,4vw,56px) 20px;
  }
  .mobile-menu[hidden]{display:none;}
  .mobile-menu a{display:block;padding:14px 0;border-bottom:1px solid var(--line-light);font-size:0.95rem;}
  .mobile-menu a:last-child{border-bottom:0;}
}
@media (max-width:520px){.nav-cta{display:none;}.nav-logo img{height:38px;}}

/* ---------- Buttons ---------- */
.btn{padding:12px 24px;border-radius:6px;font-size:0.9rem;font-weight:500;display:inline-block;border:1px solid transparent;transition:transform .25s var(--ease),background .25s,border-color .25s,box-shadow .25s;}
.btn-amber{background:var(--amber);color:#fff;}
.btn-amber:hover{transform:translateY(-2px);background:var(--amber-hi);box-shadow:0 10px 24px -12px rgba(11,92,158,0.6);}
.btn-amber:active{transform:translateY(0);}
.btn-teal{background:var(--teal);color:#fff;}
.btn-teal:hover{transform:translateY(-2px);background:var(--teal-hi);box-shadow:0 10px 24px -12px rgba(19,41,75,0.55);}
.btn-ghost-dark,.btn-ghost-light{border-color:var(--line-light);color:var(--ink);}
.btn-ghost-dark:hover,.btn-ghost-light:hover{border-color:var(--slate);transform:translateY(-2px);}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;}

/* ---------- Home hero (carousel) ---------- */
.hero{
  position:relative;padding:calc(130px + env(safe-area-inset-top,0px)) var(--gutter) 64px;
  display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:clamp(28px,5vw,72px);align-items:center;
  background:linear-gradient(180deg,var(--white) 0%,var(--steel-2) 100%);
  border-bottom:1px solid var(--line-light);overflow:hidden;
}
.hero-kicker{font-size:0.78rem;letter-spacing:0.04em;color:var(--slate);margin-bottom:22px;display:flex;align-items:center;gap:10px;}
.hero-kicker::before{content:"";width:22px;height:1px;background:var(--amber);}
.slides{display:grid;}
.slide{grid-area:1/1;opacity:0;visibility:hidden;transform:translateY(10px);transition:opacity .7s var(--ease),transform .7s var(--ease),visibility 0s .7s;}
.slide.is-active{opacity:1;visibility:visible;transform:none;transition:opacity .7s var(--ease),transform .7s var(--ease),visibility 0s;}
.slide .eyebrow{color:var(--amber);opacity:1;margin-bottom:14px;font-weight:600;}
.slide h1{font-size:clamp(2.1rem,4.6vw,3.6rem);line-height:1.06;max-width:18ch;}
.slide p{margin-top:20px;font-size:1.02rem;line-height:1.65;opacity:0.72;max-width:52ch;}
.slide .hero-cta{margin-top:30px;}
.hero-dots{display:flex;gap:8px;margin-top:40px;}
.hero-dots button{width:28px;height:4px;border-radius:4px;border:0;background:var(--line-light);padding:0;transition:background .3s,width .3s var(--ease);}
.hero-dots button[aria-selected="true"]{background:var(--amber);width:44px;}
.hero-art{position:relative;width:100%;max-width:560px;justify-self:end;}
.hero-art svg{width:100%;height:auto;}
.hero-art .wave{animation:wave-pulse 3.2s var(--ease) infinite;transform-origin:center;}
.hero-art .wave.w2{animation-delay:.35s;}
.hero-art .wave.w3{animation-delay:.7s;}
@keyframes wave-pulse{0%,100%{opacity:.25;}50%{opacity:1;}}
.hero-art .truck{animation:haul 9s linear infinite;}
@keyframes haul{0%{offset-distance:0%;}100%{offset-distance:100%;}}
@media (max-width:900px){
  .hero{grid-template-columns:1fr;padding-top:calc(112px + env(safe-area-inset-top,0px));}
  .hero-art{justify-self:start;max-width:460px;}
}

/* ---------- Stats strip ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);border-bottom:1px solid var(--line-light);}
.stat{padding:30px var(--gutter);padding-inline:clamp(20px,3vw,40px);border-right:1px solid var(--line-light);}
.stat:first-child{padding-left:var(--gutter);}
.stat:last-child{border-right:0;}
.stat b{display:block;font-size:clamp(1.7rem,3.2vw,2.4rem);font-weight:600;letter-spacing:-0.02em;color:var(--teal);font-variant-numeric:tabular-nums;}
.stat span{display:block;margin-top:6px;font-size:0.82rem;opacity:0.65;line-height:1.45;max-width:24ch;}
@media (max-width:760px){
  .stats{grid-template-columns:repeat(2,1fr);}
  .stat,.stat:first-child{padding:24px 20px;}
  .stat:nth-child(2){border-right:0;}
  .stat:nth-child(-n+2){border-bottom:1px solid var(--line-light);}
}

/* ---------- Partners ---------- */
.partners{background:var(--white);border-bottom:1px solid var(--line-light);padding:28px var(--gutter) 30px;}
.partners .eyebrow{color:rgba(11,18,32,0.5);margin-bottom:22px;text-align:center;}
.partner-row{display:flex;justify-content:center;align-items:center;gap:clamp(22px,4.5vw,60px);flex-wrap:wrap;}
.partner-name{font-family:var(--font-sans);font-weight:600;font-size:clamp(1rem,2vw,1.3rem);color:rgba(11,18,32,0.4);letter-spacing:0.01em;transition:color 0.25s;white-space:nowrap;}
.partner-name:hover{color:var(--ink);}

/* ---------- Divisions / sections ---------- */
.division{padding:72px var(--gutter) 40px;background:var(--white);}
.division-alt{background:var(--steel-2);}
.division-head{display:flex;justify-content:space-between;align-items:flex-end;gap:30px;flex-wrap:wrap;border-bottom:1px solid var(--line-light);padding-bottom:24px;margin-bottom:36px;}
.division-head > div{min-width:0;}
.division-head .tag{display:flex;align-items:center;gap:10px;margin-bottom:12px;}
.division-head .dot{width:10px;height:10px;border-radius:50%;flex:none;background:var(--amber);}
.division-head .dot.navy{background:var(--teal);}
.division-head h2{font-size:clamp(1.9rem,4vw,2.9rem);max-width:22ch;}
.division-head p{max-width:50ch;opacity:0.68;font-size:0.98rem;line-height:1.6;margin-top:10px;}

/* word reveal (headline entrance, as BBS) */
.word-reveal-word{display:inline-block;opacity:0;transform:translateY(12px);animation:word-reveal-in .5s cubic-bezier(.22,.68,.32,1) forwards;}
@keyframes word-reveal-in{to{opacity:1;transform:translateY(0);}}
@media (prefers-reduced-motion: reduce){.word-reveal-word{opacity:1;transform:none;animation:none;}}

/* ---------- Offer cards ---------- */
.offer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line-light);border:1px solid var(--line-light);border-radius:16px;overflow:hidden;}
.offer-grid-3{grid-template-columns:repeat(3,1fr);}
.offer-grid-2{grid-template-columns:repeat(2,1fr);}
@media (max-width:980px){.offer-grid,.offer-grid-3{grid-template-columns:repeat(2,1fr);}}
@media (max-width:560px){.offer-grid,.offer-grid-3,.offer-grid-2{grid-template-columns:1fr;}}
.offer-card{background:var(--white);padding:32px 26px;min-height:230px;display:flex;flex-direction:column;gap:0;transition:background .3s,transform .4s var(--ease),box-shadow .4s var(--ease);min-width:0;}
.offer-card:hover{transform:translateY(-6px);box-shadow:0 16px 40px -20px rgba(11,18,32,0.25);background:var(--steel-2);}
.division-alt .offer-card:hover{background:#E9EEF3;}
.offer-card .card-top{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;}
.offer-card .icon{width:34px;height:34px;color:var(--amber);flex:none;}
.offer-card h3{font-size:1.08rem;margin-top:22px;line-height:1.25;}
.offer-card p{font-size:0.86rem;opacity:0.7;line-height:1.6;margin-top:8px;}
.offer-card .id{font-family:var(--font-sans);font-size:0.66rem;opacity:0.45;letter-spacing:0.08em;}
.offer-card .more{margin-top:auto;padding-top:22px;font-size:0.82rem;font-weight:600;color:var(--amber);display:inline-flex;align-items:center;gap:6px;}
.offer-card .more::after{content:"→";transition:transform .25s var(--ease);}
.offer-card:hover .more::after{transform:translateX(4px);}
.offer-card .oem{margin-top:auto;padding-top:18px;font-size:0.72rem;letter-spacing:0.06em;text-transform:uppercase;color:var(--teal);opacity:0.75;}

/* reveal-on-scroll: only hidden once JS has marked the page ready, so content is never stuck invisible */
.js .reveal{opacity:0;transform:translateY(24px);transition:opacity .8s var(--ease),transform .8s var(--ease);}
.js .reveal.in{opacity:1;transform:translateY(0);}
.offer-card.reveal.in:hover{transform:translateY(-6px);}
.offer-grid .offer-card:nth-child(2){transition-delay:.08s;}
.offer-grid .offer-card:nth-child(3){transition-delay:.16s;}
.offer-grid .offer-card:nth-child(4){transition-delay:.24s;}
.offer-grid .offer-card:nth-child(n+5){transition-delay:.32s;}

/* ---------- About split ---------- */
.about-split{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:clamp(28px,5vw,64px);align-items:start;}
.about-copy p{font-size:1rem;line-height:1.75;opacity:0.78;max-width:62ch;}
.about-copy p + p{margin-top:16px;}
.mv{display:flex;flex-direction:column;gap:14px;}
.mv-card{border:1px solid var(--line-light);border-radius:16px;padding:26px;background:var(--white);}
.mv-card .eyebrow{color:var(--amber);opacity:1;font-weight:600;}
.mv-card p{margin-top:10px;font-size:0.95rem;line-height:1.65;opacity:0.78;}
@media (max-width:860px){.about-split{grid-template-columns:1fr;}}

/* ---------- Delivery process (a real sequence, so numbered) ---------- */
.process{display:grid;grid-template-columns:repeat(5,1fr);gap:0;counter-reset:step;list-style:none;margin:0;padding:0;}
.process li{position:relative;padding:0 18px 0 0;min-width:0;}
.process li::before{
  counter-increment:step;content:counter(step,decimal-leading-zero);
  display:flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:50%;
  border:1px solid var(--amber);color:var(--amber);background:var(--white);font-size:0.8rem;font-weight:600;
  position:relative;z-index:1;font-variant-numeric:tabular-nums;
}
.process li::after{content:"";position:absolute;top:22px;left:44px;right:0;border-top:1px dashed rgba(11,92,158,0.35);}
.process li:last-child::after{display:none;}
.process h3{font-size:1rem;margin-top:18px;}
.process p{font-size:0.85rem;line-height:1.6;opacity:0.7;margin-top:6px;}
@media (max-width:900px){
  .process{grid-template-columns:1fr;gap:22px;}
  .process li{display:grid;grid-template-columns:44px 1fr;column-gap:18px;padding:0;}
  .process li::before{grid-row:1/3;}
  .process li::after{top:44px;bottom:-22px;left:22px;right:auto;border-top:0;border-left:1px dashed rgba(11,92,158,0.35);}
  .process h3{margin-top:10px;}
}

/* ---------- Chips ---------- */
.chip-grid{display:flex;flex-wrap:wrap;gap:12px;}
.chip{padding:11px 20px;border:1px solid var(--line-light);border-radius:100px;font-size:0.86rem;color:var(--ink);background:var(--white);transition:border-color 0.2s,background 0.2s;}
.chip:hover{border-color:var(--amber);background:rgba(11,92,158,0.06);}

/* ---------- FAQ ---------- */
.faq-list{display:flex;flex-direction:column;border-top:1px solid var(--line-light);max-width:900px;}
.faq-item{border-bottom:1px solid var(--line-light);padding:22px 4px;}
.faq-item summary{cursor:pointer;font-weight:600;font-size:1.02rem;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{content:"+";font-size:1.1rem;color:var(--amber);flex:none;transition:transform 0.25s var(--ease);}
.faq-item[open] summary::after{transform:rotate(45deg);}
.faq-item p{margin-top:12px;font-size:0.92rem;line-height:1.65;opacity:0.72;max-width:66ch;}

/* ---------- Connector (dashed divider from BBS) ---------- */
.connector{display:flex;align-items:center;justify-content:center;padding:12px 0;background:var(--white);}
.connector svg{width:min(640px,80vw);height:26px;}
.connector line{stroke:var(--line-light);stroke-width:1.2;stroke-dasharray:3 6;}
.connector circle{fill:var(--white);stroke:var(--slate);stroke-width:1.4;}

/* ---------- CTA band + contact directory ---------- */
.band{background:var(--white);color:var(--ink);text-align:center;padding:96px 24px 64px;border-top:1px solid var(--line-light);}
.band h2{font-size:clamp(1.9rem,4vw,3rem);max-width:22ch;margin:0 auto;line-height:1.12;}
.band > p{margin:14px auto 0;opacity:0.68;font-size:1rem;max-width:56ch;}
.band .hero-cta{margin-top:30px;justify-content:center;}
.directory{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line-light);border:1px solid var(--line-light);border-radius:16px;overflow:hidden;max-width:1080px;margin:56px auto 0;text-align:left;}
.directory > div{background:var(--white);padding:28px 26px;min-width:0;}
.directory .eyebrow{color:var(--amber);opacity:1;font-weight:600;}
.directory ul{list-style:none;margin:14px 0 0;padding:0;display:flex;flex-direction:column;gap:8px;font-size:0.92rem;}
.directory a{overflow-wrap:anywhere;}
.directory a:hover{color:var(--amber);}
.directory address{font-style:normal;margin-top:14px;font-size:0.92rem;line-height:1.6;}
@media (max-width:860px){.directory{grid-template-columns:1fr;}}

/* ---------- Subpage banner ---------- */
.page-banner{padding:calc(132px + env(safe-area-inset-top,0px)) var(--gutter) 56px;background:linear-gradient(180deg,var(--white) 0%,var(--steel-2) 100%);border-bottom:1px solid var(--line-light);position:relative;overflow:hidden;}
.page-banner .back{font-size:0.82rem;opacity:0.65;display:inline-block;margin-bottom:28px;transition:opacity .2s;}
.page-banner .back:hover{opacity:1;}
.page-banner .eyebrow{color:var(--amber);opacity:1;font-weight:600;}
.page-banner h1{font-size:clamp(2.1rem,4.8vw,3.6rem);line-height:1.06;margin-top:14px;max-width:20ch;}
.page-banner p{margin-top:18px;font-size:1.02rem;line-height:1.65;opacity:0.72;max-width:60ch;}
.page-banner .rings{position:absolute;right:calc(var(--gutter) - 40px);top:50%;width:min(420px,40vw);transform:translateY(-35%);opacity:0.5;pointer-events:none;}
@media (max-width:760px){.page-banner .rings{display:none;}}

/* ---------- Footer ---------- */
footer{background:var(--white);color:rgba(11,18,32,0.68);padding:64px var(--gutter) calc(32px + env(safe-area-inset-bottom,0px));font-size:0.85rem;border-top:1px solid var(--line-light);}
.footer-grid{display:grid;grid-template-columns:1.6fr repeat(5,1fr);gap:26px;padding-bottom:44px;border-bottom:1px solid var(--line-light);}
.footer-grid > div{min-width:0;}
@media (max-width:1020px){.footer-grid{grid-template-columns:repeat(3,1fr);}.footer-grid > div:first-child{grid-column:1/-1;}}
@media (max-width:560px){.footer-grid{grid-template-columns:repeat(2,1fr);}}
.footer-brand img{height:52px;width:auto;}
.footer-about{margin-top:14px;line-height:1.6;max-width:36ch;}
.footer-grid h4{font-size:0.68rem;text-transform:uppercase;letter-spacing:0.1em;color:var(--ink);opacity:0.75;margin-bottom:14px;font-weight:600;}
.footer-grid ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:9px;}
.footer-grid a{opacity:0.75;transition:opacity 0.2s;}
.footer-grid a:hover{opacity:1;color:var(--amber);}
.footer-contact{list-style:none;margin:18px 0 0;padding:0;display:flex;flex-direction:column;gap:8px;font-size:0.82rem;}
.footer-contact a{overflow-wrap:anywhere;}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;padding-top:24px;flex-wrap:wrap;gap:12px;font-size:0.76rem;opacity:0.6;}
.footer-partners{margin-top:36px;padding-top:32px;border-top:1px solid var(--line-light);}
.footer-partners .eyebrow{color:rgba(11,18,32,0.45);margin-bottom:22px;text-align:center;}