:root{color-scheme:dark;--bg:#080d16;--panel:#101827;--panel2:#151f30;--text:#f1f5fb;--muted:#a4b1c4;--line:#253247;--blue:#43a5ff;--cyan:#62e5d0}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.6 Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif}a{color:inherit;text-decoration:none}button,input,textarea{font:inherit}button{cursor:pointer}.wrap{max-width:1200px;margin:auto;padding-left:24px;padding-right:24px}.top{border-bottom:1px solid var(--line);background:var(--panel)}.nav{padding-top:15px;padding-bottom:15px;display:flex;align-items:center;gap:22px}.brand{display:flex;align-items:center;gap:11px;font-weight:850;letter-spacing:-.5px;font-size:18px;white-space:nowrap}.brand em{font-style:normal;color:var(--blue)}.logo{height:39px;width:39px;border-radius:12px;background:linear-gradient(135deg,#2c8cff,#5de4d0);display:grid;place-items:center;color:#071321;font-size:20px;font-weight:900}.navlinks{display:flex;gap:21px;margin-left:auto;color:var(--muted);font-size:14px}.navlinks a:hover{color:var(--blue)}.search{display:flex;gap:8px;align-items:center;background:var(--panel2);border:1px solid var(--line);padding:8px 12px;border-radius:11px;width:210px}.search input{width:100%;background:transparent;border:0;outline:0;color:var(--text);min-width:0}.hero{padding-top:55px;padding-bottom:30px;display:grid;grid-template-columns:1.1fr .9fr;gap:36px;align-items:center}.eyebrow{display:inline-flex;gap:8px;align-items:center;border:1px solid #2b5875;background:#10283a;color:#8bd2ff;border-radius:99px;padding:6px 11px;font-size:12px;font-weight:800;letter-spacing:1px;text-transform:uppercase}.eyebrow i{width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 12px var(--cyan)}h1{font-size:clamp(38px,5vw,64px);line-height:1.04;letter-spacing:-2.6px;margin:19px 0 18px}h1 span{color:var(--blue)}.hero p{font-size:17px;line-height:1.7;color:var(--muted);max-width:590px;margin:0 0 24px}.actions{display:flex;gap:12px;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:10px;padding:10px 15px;background:var(--panel);color:var(--text);font-weight:750}.btn.primary{background:var(--blue);color:#04101e;border-color:var(--blue)}.btn:hover{filter:brightness(1.08);transform:translateY(-1px)}.hero-art{position:relative;min-height:310px;border:1px solid #2b3d57;border-radius:24px;overflow:hidden;background:radial-gradient(ellipse at 60% 45%,#17476a 0%,#102238 35%,#0b1220 72%);padding:23px}.art-grid{position:absolute;inset:0;background-image:linear-gradient(#6bbdff12 1px,transparent 1px),linear-gradient(90deg,#6bbdff12 1px,transparent 1px);background-size:26px 26px}.plc{position:relative;margin:25px auto;width:220px;height:220px;border:2px solid #5bbcff;border-radius:14px;background:linear-gradient(145deg,#203e56,#0a1728);box-shadow:0 0 45px #2b9dff33;display:flex;align-items:center;justify-content:center;gap:10px;transform:perspective(700px) rotateY(-10deg) rotateX(3deg)}.plc:before{content:'PLC  CPU 1214C';position:absolute;top:15px;left:15px;color:#a8dfff;font-size:11px;font-weight:800;letter-spacing:1px}.slot{height:128px;width:42px;border:1px solid #4d7796;background:repeating-linear-gradient(0deg,#0b1c2c 0 8px,#1d4059 8px 10px);border-radius:5px}.slot.cpu{width:57px;background:linear-gradient(90deg,#1c5d87,#12334e)}.leds{position:absolute;bottom:18px;display:flex;gap:7px}.leds i{width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 8px var(--cyan)}.art-label{position:absolute;left:20px;bottom:18px;color:#a9c7df;font-size:11px;letter-spacing:1.4px}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;padding-top:5px;padding-bottom:32px}.stat{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:16px 18px}.stat b{display:block;font-size:16px}.stat small{display:block;color:var(--muted);font-size:12px}.section{padding-top:24px;padding-bottom:24px}.section-head{display:flex;justify-content:space-between;gap:20px;align-items:end;margin-bottom:20px}.kicker{color:var(--blue);font-size:11px;font-weight:850;letter-spacing:1.6px}.section h2{font-size:28px;letter-spacing:-.8px;margin:5px 0 0}.section-head p{margin:0;color:var(--muted)}.chips{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:20px}.chip{border:1px solid var(--line);background:var(--panel);border-radius:99px;padding:7px 12px;color:var(--muted);font-size:13px}.chip.active{background:#122d43;border-color:#3c8dce;color:#9ed9ff}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:17px}.card{background:var(--panel);border:1px solid var(--line);border-radius:17px;overflow:hidden;display:flex;flex-direction:column;transition:transform .2s,border-color .2s}.card:hover{transform:translateY(-3px);border-color:#477ba5}.thumb{height:155px;padding:18px;position:relative;overflow:hidden;background:linear-gradient(140deg,#12304c,#0a1524)}.thumb:before{content:'';position:absolute;inset:0;background:linear-gradient(120deg,transparent 35%,#42a7ff20),repeating-linear-gradient(0deg,transparent 0 22px,#7dc8ff12 23px 24px)}.thumb .glyph{position:absolute;right:24px;top:22px;font-size:56px}.thumb .mini{position:absolute;left:20px;bottom:19px;color:#9bdcff;font-size:11px;font-weight:800;letter-spacing:2px}.thumb .lineart{position:absolute;left:23px;top:32px;width:120px;height:72px;border:2px solid #65caff;border-radius:7px;opacity:.8}.thumb .lineart:before,.thumb .lineart:after{content:'';position:absolute;left:25px;right:25px;top:20px;height:2px;background:#65caff;box-shadow:0 20px #65caff}.thumb .lineart:after{left:50%;right:auto;top:0;bottom:0;height:auto;width:2px;box-shadow:25px 0 #65caff,-25px 0 #65caff}.thumb.t2{background:linear-gradient(140deg,#163e3e,#0a1824)}.thumb.t3{background:linear-gradient(140deg,#49311b,#101827)}.thumb.t4{background:linear-gradient(140deg,#242c57,#101827)}.thumb.t5{background:linear-gradient(140deg,#183f54,#101827)}.thumb.t6{background:linear-gradient(140deg,#463050,#101827)}.cardbody{padding:18px;display:flex;flex-direction:column;flex:1}.meta{display:flex;justify-content:space-between;gap:10px;color:var(--muted);font-size:12px}.tag{font-size:11px;font-weight:800;color:var(--cyan);background:#102b2b;padding:4px 8px;border-radius:6px}.card h3{font-size:18px;line-height:1.3;margin:13px 0 8px;letter-spacing:-.3px}.card p{color:var(--muted);font-size:13px;line-height:1.65;margin:0 0 18px}.read{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:14px;border-top:1px solid var(--line);color:var(--blue);font-weight:800;font-size:13px;background:none;border-left:0;border-right:0;border-bottom:0;text-align:left}.empty{padding:32px;border:1px dashed var(--line);border-radius:14px;color:var(--muted);text-align:center;grid-column:1/-1}.lower{display:grid;grid-template-columns:1fr 1fr;gap:18px;padding-top:30px;padding-bottom:40px}.panel{border:1px solid var(--line);background:var(--panel);border-radius:18px;padding:24px}.panel h3{font-size:21px;margin:6px 0 8px}.panel p,.muted{color:var(--muted);font-size:14px}.resource{display:flex;align-items:center;gap:12px;padding:13px 0;border-bottom:1px solid var(--line)}.resource:last-child{border:0}.resource>span{width:38px;height:38px;border-radius:10px;background:var(--panel2);display:grid;place-items:center;color:var(--blue);font-size:19px;flex-shrink:0}.resource b{display:block;font-size:14px}.resource small{display:block;color:var(--muted)}.newsletter{display:flex;gap:8px;margin-top:18px}.newsletter input,.comment-form input,.comment-form textarea{min-width:0;flex:1;background:var(--bg);border:1px solid var(--line);border-radius:9px;padding:11px;color:var(--text)}.fine{font-size:11px!important}.foot{border-top:1px solid var(--line);padding-top:26px;padding-bottom:26px;color:var(--muted);font-size:12px}.footin{display:flex;justify-content:space-between;gap:20px}.modal{position:fixed;inset:0;z-index:20;background:#02060de8;display:none;align-items:center;justify-content:center;padding:18px}.modal.show{display:flex}.dialog{max-width:760px;width:100%;max-height:90vh;overflow:auto;background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:25px}.dialogtop{display:flex;justify-content:space-between;align-items:start;gap:20px}.close{border:1px solid var(--line);border-radius:8px;background:var(--panel2);color:var(--text);padding:7px 11px}.dialog h2{font-size:28px;line-height:1.2;margin:12px 0}.article-content{color:#d3dceb;line-height:1.85}.article-content h2,.article-content h3{color:var(--text);margin-top:25px}.article-content pre{white-space:pre-wrap;background:var(--panel2);padding:14px;border-radius:9px;color:var(--cyan)}.article-image{max-width:100%;max-height:300px;border-radius:12px;object-fit:cover;margin:10px 0}.comment-form{display:grid;gap:10px;margin-top:16px}.comment-form textarea{min-height:100px;resize:vertical}.comment-item{padding:12px 0;border-bottom:1px solid var(--line)}.comment-item b{font-size:13px}.comment-item p{margin:4px 0;color:var(--muted)}hr{border:0;border-top:1px solid var(--line);margin:25px 0}.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:#163a38;border:1px solid #327e73;color:#c8fff4;padding:12px 17px;border-radius:10px;display:none;z-index:50;max-width:90vw}.toast.show{display:block}.admin-wrap{max-width:1000px;margin:40px auto;padding:0 20px}.admin-card{max-width:500px;margin:40px auto;background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:24px}.admin-form{display:grid;gap:12px}.admin-form label{display:grid;gap:6px;color:var(--muted);font-size:13px}.admin-form input,.admin-form textarea,.admin-form select{background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:10px;color:var(--text);width:100%}.admin-form textarea{min-height:150px}.admin-top{display:flex;justify-content:space-between;align-items:center;gap:15px;flex-wrap:wrap}.admin-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:20px}.admin-list{display:grid;gap:8px}.admin-item{border:1px solid var(--line);background:var(--panel);border-radius:10px;padding:12px;display:flex;gap:12px;justify-content:space-between;align-items:center}.admin-item small{display:block;color:var(--muted)}.actions-small{display:flex;gap:6px;flex-wrap:wrap}.btn.small{padding:6px 9px;font-size:12px}.notice{color:var(--muted);font-size:13px}.checkline{display:flex!important;grid-template-columns:auto 1fr;align-items:center;gap:9px!important}.checkline input{width:auto}.hidden{display:none!important}@media(max-width:900px){.hero{grid-template-columns:1fr;padding-top:36px}.hero-art{min-height:270px}.navlinks{display:none}.search{margin-left:auto}.cards{grid-template-columns:repeat(2,1fr)}.lower{grid-template-columns:1fr}}@media(max-width:560px){.wrap{padding-left:17px;padding-right:17px}.nav{gap:10px}.brand{font-size:15px}.logo{height:34px;width:34px}.search{width:44px;padding:8px;overflow:hidden}.search:focus-within{width:150px}.search input{min-width:120px}.hero{padding-top:32px;gap:24px}h1{letter-spacing:-1.6px}.hero p{font-size:15px}.hero-art{min-height:235px}.plc{width:180px;height:180px;margin:17px auto}.slot{height:105px;width:32px}.slot.cpu{width:45px}.stats{grid-template-columns:1fr 1fr;gap:8px}.stat{padding:12px}.stat:last-child{display:none}.section-head{align-items:start;flex-direction:column}.section h2{font-size:25px}.cards{grid-template-columns:1fr}.lower{padding-top:25px}.footin{flex-direction:column}.newsletter{flex-direction:column}.dialog{padding:18px}.admin-grid{grid-template-columns:1fr}}


/* ==========================================
   PLC LEARNING HUB  VISUAL POLISH
   Additive overrides: keep existing styles
   ========================================== */

/* 1. Add subtle depth to the page background */
body {
  background:
    radial-gradient(
      ellipse at 50% 0%,
      rgba(36, 105, 166, 0.12),
      transparent 48%
    ),
    var(--bg);
}

/* 2. Give the navigation a cleaner appearance */
.top {
  background: rgba(16, 24, 39, 0.94);
  border-bottom-color: rgba(100, 160, 210, 0.18);
}

.brand {
  letter-spacing: -0.6px;
}

.logo {
  box-shadow: 0 0 22px rgba(67, 165, 255, 0.18);
}

/* 3. Improve heading readability */
h1 {
  line-height: 1.08;
  text-wrap: balance;
}

h1 span {
  background: linear-gradient(100deg, #63b5ff, #62e5d0);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section h2 {
  line-height: 1.2;
  text-wrap: balance;
}

/* 4. Refine buttons without changing their actions */
.btn {
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    border-color 180ms ease,
    background-color 180ms ease;
}

.btn.primary {
  box-shadow: 0 5px 18px rgba(67, 165, 255, 0.16);
}

.btn.primary:hover {
  box-shadow: 0 8px 25px rgba(67, 165, 255, 0.28);
}

/* 5. Make the PLC hero panel feel more premium */
.hero-art {
  box-shadow:
    0 18px 55px rgba(0, 0, 0, 0.16),
    inset 0 1px 0 rgba(255, 255, 255, 0.035);
}

.plc {
  box-shadow:
    0 0 45px rgba(43, 157, 255, 0.18),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

/* 6. Improve lesson card depth and hover feedback */
.card {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.10);
  transition:
    transform 200ms ease,
    border-color 200ms ease,
    box-shadow 200ms ease;
}

.card:hover {
  transform: translateY(-5px);
  border-color: rgba(67, 165, 255, 0.65);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.22);
}

.thumb {
  border-bottom: 1px solid rgba(100, 160, 210, 0.12);
}

.tag {
  letter-spacing: 0.25px;
}

/* 7. Make resource and newsletter panels consistent */
.panel {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.resource {
  transition: background-color 180ms ease;
}

.resource:hover > span {
  background: #1a3450;
  color: #75c1ff;
}

/* 8. Make search and form fields easier to use */
.search:focus-within {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(67, 165, 255, 0.10);
}

.newsletter input:focus,
.comment-form input:focus,
.comment-form textarea:focus,
.admin-form input:focus,
.admin-form textarea:focus,
.admin-form select:focus {
  outline: 2px solid rgba(67, 165, 255, 0.65);
  outline-offset: 1px;
}

/* 9. Visible keyboard focus for accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* 10. Respect users who prefer less animation */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}


/* Mobile-only SCADA navigation link */
.mobile-scada-link {
    display: none;
}

@media screen and (max-width: 768px) {
    .nav .mobile-scada-link {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        padding: 10px 14px;
        margin: 8px 0;
        border-radius: 8px;
        background: #0d9488;
        color: #ffffff;
        font-weight: 700;
        text-decoration: none;
        white-space: nowrap;
        flex-shrink: 0;
    }

    .nav .mobile-scada-link:hover {
        background: #0f766e;
    }
}


/* PLC Learning Hub - navigation button fix */
.top .nav .navlinks {
    display: flex !important;
    align-items: center;
    flex-wrap: wrap;
    gap: 9px !important;
}

.top .nav .navlinks a {
    display: inline-flex !important;
    align-items: center;
    justify-content: center;
    padding: 8px 12px !important;
    border: 1px solid #253247 !important;
    border-radius: 10px !important;
    background: #151f30 !important;
    color: #f1f5fb !important;
    font-size: 14px;
    font-weight: 650;
    line-height: 1.4;
    text-decoration: none !important;
    white-space: nowrap;
    transition: all 0.2s ease;
}

.top .nav .navlinks a:hover {
    background: #162b40 !important;
    border-color: #43a5ff !important;
    color: #9ed9ff !important;
    transform: translateY(-1px);
    box-shadow: 0 5px 16px rgba(67, 165, 255, 0.15);
}



/* Factory simulation showcase */
.factory-cta {
  border-color: rgba(98, 229, 208, .42);
}
.factory-cta:hover {
  border-color: var(--cyan);
  box-shadow: 0 7px 22px rgba(98, 229, 208, .12);
}
.conveyor-cta {
  background: linear-gradient(135deg, #132b32, #101827);
}
.factory-section {
  padding-top: 28px;
  padding-bottom: 32px;
}
.factory-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 22px;
  margin-bottom: 20px;
}
.factory-heading h2 {
  margin: 5px 0 0;
  font-size: 28px;
  letter-spacing: -.8px;
  line-height: 1.2;
}
.factory-heading p {
  max-width: 430px;
  margin: 0;
  color: var(--muted);
}
.factory-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.factory-card {
  min-width: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(145deg, rgba(21,31,48,.98), rgba(10,17,29,.98));
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.factory-card:hover {
  transform: translateY(-4px);
  border-color: rgba(67,165,255,.7);
  box-shadow: 0 16px 38px rgba(0,0,0,.22);
}
.factory-visual {
  height: 170px;
  position: relative;
  overflow: hidden;
  display: grid;
  place-items: center;
  background:
    linear-gradient(rgba(100,190,255,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(100,190,255,.07) 1px, transparent 1px),
    radial-gradient(ellipse at 50% 45%, #164568, #0b1423 72%);
  background-size: 24px 24px, 24px 24px, auto;
  border-bottom: 1px solid rgba(100,160,210,.14);
}
.conveyor-factory .factory-visual {
  background:
    linear-gradient(rgba(98,229,208,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(98,229,208,.06) 1px, transparent 1px),
    radial-gradient(ellipse at 50% 45%, #16413f, #0b1423 72%);
  background-size: 24px 24px, 24px 24px, auto;
}
.factory-orbit {
  position: absolute;
  width: 142px;
  height: 90px;
  border: 1px solid rgba(98,229,208,.65);
  border-radius: 50%;
  transform: rotate(-28deg);
}
.orbit-two {
  width: 185px;
  height: 110px;
  transform: rotate(34deg);
  border-color: rgba(67,165,255,.55);
}
.factory-machine {
  z-index: 1;
  display: grid;
  place-items: center;
  width: 78px;
  height: 78px;
  border: 1px solid #67c7ff;
  border-radius: 17px;
  color: #b9e8ff;
  background: linear-gradient(145deg, #1c4e70, #102337);
  box-shadow: 0 0 35px rgba(67,165,255,.22), inset 0 1px rgba(255,255,255,.1);
  font-size: 42px;
}
.factory-chip {
  position: absolute;
  left: 15px;
  bottom: 13px;
  color: #a7dfff;
  font-size: 10px;
  font-weight: 850;
  letter-spacing: 1.5px;
}
.conveyor-belt {
  position: absolute;
  left: 12%;
  right: 12%;
  top: 91px;
  height: 25px;
  border: 2px solid #5ce0ce;
  border-radius: 5px;
  background: repeating-linear-gradient(90deg, #163d45 0 16px, #2b6870 17px 19px);
  box-shadow: 0 8px 20px rgba(0,0,0,.2);
}
.conveyor-belt:before, .conveyor-belt:after {
  content: "";
  position: absolute;
  top: 25px;
  width: 5px;
  height: 24px;
  background: #477b83;
}
.conveyor-belt:before { left: 12%; }
.conveyor-belt:after { right: 12%; }
.conveyor-box {
  position: absolute;
  z-index: 1;
  top: 63px;
  width: 27px;
  height: 27px;
  border: 1px solid #ffcf7b;
  border-radius: 4px;
  background: linear-gradient(135deg, #b77a31, #68421e);
  box-shadow: 0 0 17px rgba(255,190,95,.16);
}
.box-one { left: 32%; }
.box-two { left: 62%; top: 65px; }
.conveyor-sensor {
  position: absolute;
  top: 37px;
  left: 51%;
  width: 3px;
  height: 49px;
  background: #7fe5d7;
  box-shadow: 0 0 12px rgba(98,229,208,.5);
}
.factory-card-body {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  flex: 1;
  padding: 20px;
}
.factory-label {
  color: var(--cyan);
  font-size: 10px;
  font-weight: 850;
  letter-spacing: 1.4px;
}
.factory-card h3 {
  margin: 9px 0 7px;
  font-size: 21px;
  letter-spacing: -.5px;
  line-height: 1.25;
}
.factory-card p {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}
.factory-link {
  margin-top: auto;
  width: 100%;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 850;
}
.factory-link span { font-size: 18px; line-height: 1; }
@media (max-width: 700px) {
  .factory-heading { align-items: flex-start; flex-direction: column; }
  .factory-grid { grid-template-columns: 1fr; }
  .factory-visual { height: 155px; }
  .factory-card h3 { font-size: 19px; }
}