/* ============================================================
   SCREENBLACK — UNIFIED SITE STYLESHEET
   Design reference: /black-screen-image/ page
   One stylesheet, used by every page on the site.
   ============================================================ */

:root{
  --bg:#07090d;
  --panel:#10141b;
  --panel-2:#141922;
  --line:#202936;
  --text:#f4f7fb;
  --muted:#a9b4c3;
  --blue:#b9e8ff;
  --accent:#68c9ff;
  --accent-strong:#8fd8ff;
  --radius:16px;
  --radius-sm:10px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--accent-strong)}
img{max-width:100%;display:block}
button,input,select{font:inherit;color:inherit}
.wrap{width:min(1080px,92%);margin:auto}
.wrap-narrow{width:min(860px,92%);margin:auto}

/* ---------- HEADER ---------- */
header.site-header{
  border-bottom:1px solid var(--line);
  background:#080b10;
  position:sticky;
  top:0;
  z-index:50;
}
.nav-row{
  min-height:72px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
}
.brand{
  font-weight:900;
  letter-spacing:.04em;
  font-size:1.15rem;
  color:var(--text);
  white-space:nowrap;
  flex-shrink:0;
}
.brand span{color:#fff}
.brand b{color:var(--accent);font-weight:900}
.site-nav{
  display:flex;
  gap:18px;
  flex-wrap:nowrap;
  overflow-x:auto;
  scrollbar-width:none;
}
.site-nav::-webkit-scrollbar{display:none}
.site-nav a{color:#c7d0dc;font-size:.93rem;white-space:nowrap}
.site-nav a:hover{color:var(--text)}

.site-menu-toggle{
  display:none;
  width:42px;
  height:42px;
  padding:9px;
  border:1px solid var(--line);
  border-radius:9px;
  background:var(--panel-2);
  cursor:pointer;
  flex-shrink:0;
}
.site-menu-toggle span{
  display:block;
  height:2px;
  margin:5px 0;
  background:var(--text);
  border-radius:2px;
}

/* ---------- HERO ---------- */
.hero{
  padding:80px 0 50px;
  text-align:center;
  background:radial-gradient(circle at 50% 0%,#14202c 0,transparent 55%);
}
.hero.hero-compact{padding:60px 0 40px}
.eyebrow{
  color:var(--accent);
  font-size:.78rem;
  font-weight:800;
  letter-spacing:.15em;
  text-transform:uppercase;
  margin:0 0 10px;
}
h1{
  font-size:clamp(2.1rem,5.6vw,4rem);
  line-height:1.08;
  margin:10px 0;
  letter-spacing:-.5px;
}
.lead{max-width:760px;margin:18px auto 0;color:var(--muted);font-size:1.08rem}
.hero-actions{margin-top:26px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* ---------- BUTTONS ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  border-radius:10px;
  padding:12px 18px;
  font-weight:800;
  cursor:pointer;
  border:1px solid transparent;
  transition:transform .15s,filter .15s,background .15s;
  font-size:.95rem;
}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:#d7f3ff;color:#061019}
.btn-primary:hover{filter:brightness(1.05);color:#061019}
.btn-secondary{background:var(--panel-2);color:var(--text);border-color:var(--line)}
.btn-secondary:hover{background:#1a212c;color:var(--text)}
.btn-small{padding:9px 14px;font-size:.85rem}
.btn-block{width:100%;justify-content:center}

/* ---------- CONTENT SECTIONS ---------- */
.section{padding:56px 0}
.section-head{max-width:760px;margin:0 0 30px}
.content{padding:0 0 20px;max-width:860px;margin:auto}
.content h2{margin-top:42px;font-size:1.7rem}
.content h2:first-child{margin-top:0}
.content p{color:#c2ccd7}
.content ul,.content ol{color:#c2ccd7;padding-left:1.3em}
.content li{margin-bottom:8px}

/* ---------- CARD GRIDS ---------- */
.card-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:16px;
  margin:30px 0;
}
.card-grid.cols-2{grid-template-columns:repeat(2,1fr)}
.card-grid.cols-4{grid-template-columns:repeat(4,1fr)}
.card{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius-sm);
  padding:22px;
}
.card .card-number,.card .card-icon{
  display:inline-block;
  color:var(--accent);
  font-weight:900;
  font-size:.78rem;
  letter-spacing:.08em;
  margin-bottom:8px;
}
.card h3{margin:0 0 8px;font-size:1.08rem}
.card p{margin:0;color:var(--muted);font-size:.95rem}
.card a{font-size:.88rem;font-weight:800}
.preview{height:150px;background:#000;border:1px solid #303945;border-radius:12px;margin-bottom:18px}

/* Resource / related link cards */
.link-card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:30px 0}
.link-card{
  display:block;
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius-sm);
  padding:22px;
  transition:transform .15s,border-color .15s;
}
.link-card:hover{transform:translateY(-3px);border-color:var(--accent);color:var(--text)}
.link-card .tag{color:var(--accent);font-size:.78rem;font-weight:900;letter-spacing:.08em;display:block;margin-bottom:6px}
.link-card h3{margin:0 0 6px;font-size:1.05rem;color:var(--text)}
.link-card p,.link-card small{color:var(--muted);font-size:.9rem}

/* ---------- TABLE ---------- */
table{width:100%;border-collapse:collapse;margin:28px 0;font-size:.92rem}
th,td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line)}
th{color:var(--accent);font-size:.8rem;letter-spacing:.05em;text-transform:uppercase}
td{color:#c2ccd7}

/* ---------- STEPS ---------- */
.steps{list-style:none;counter-reset:step;padding:0;margin:28px 0}
.steps li{
  position:relative;
  padding:0 0 20px 44px;
  color:#c2ccd7;
}
.steps li::before{
  counter-increment:step;
  content:counter(step);
  position:absolute;
  left:0;top:0;
  width:28px;height:28px;
  border-radius:50%;
  background:var(--panel-2);
  border:1px solid var(--line);
  color:var(--accent);
  font-weight:800;
  font-size:.85rem;
  display:flex;align-items:center;justify-content:center;
}
.steps li strong{color:var(--text)}

/* ---------- NOTE / TIP BOXES ---------- */
.note,.tip,.warning{
  margin:24px 0;
  padding:16px 18px;
  border-radius:var(--radius-sm);
  background:var(--panel);
  border:1px solid var(--line);
  border-left:4px solid var(--accent);
  color:var(--muted);
  font-size:.95rem;
}
.warning{border-left-color:#ffb454}
.warning-box{display:flex;gap:14px;align-items:flex-start}
.warning-box .warn-icon{
  flex-shrink:0;width:34px;height:34px;border-radius:50%;
  background:#2a2013;color:#ffb454;font-weight:900;
  display:flex;align-items:center;justify-content:center;
}

/* ---------- FAQ ---------- */
.faq-list{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line);padding:18px 0}
.faq-item h3{margin:0 0 6px;font-size:1.02rem}
.faq-item p{margin:0;color:var(--muted)}

/* ---------- TOOL CARD (interactive testers) ---------- */
.tool-card{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:20px;
  overflow:hidden;
  margin:0 auto 10px;
  max-width:1080px;
}
.tool-head{
  padding:26px 28px 20px;
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:20px;
  flex-wrap:wrap;
}
.tool-head h2{margin:2px 0 6px;font-size:1.4rem}
.tool-head p{margin:0;color:var(--muted);font-size:.95rem}
.status-pill{
  background:var(--panel-2);
  border:1px solid var(--line);
  color:var(--accent);
  padding:7px 14px;
  border-radius:999px;
  font-size:.78rem;
  font-weight:800;
  white-space:nowrap;
}

.screen-stage{
  min-height:380px;
  background:#000;
  margin:0 20px;
  border-radius:var(--radius-sm);
  display:flex;
  align-items:center;
  justify-content:center;
  color:#fff;
  outline:none;
  cursor:pointer;
  border:1px solid #222;
  transition:background .2s;
  text-align:center;
}
.screen-stage{position:relative}
.screen-stage:fullscreen{border-radius:0;margin:0;min-height:100vh}
.stage-controls{position:absolute;top:16px;right:16px;display:none}
.screen-stage.test-mode .stage-controls{display:flex}
.screen-stage.test-mode .stage-message{display:none}
.screen-stage.test-mode.show-message .stage-message{display:grid}
.stage-message{opacity:.75;display:grid;gap:6px;padding:20px}
.stage-message strong{font-size:1.15rem}
.stage-message span{font-size:.82rem;color:#aeb8c2}
.stage-icon{font-size:1.4rem}

/* color / swatch / pattern picker buttons — shared visual language,
   applied to the functional classes used by each tool's script (.color-btn / .color / .swatch / .pattern) */
.color-row{display:flex;flex-wrap:wrap;gap:10px;padding:22px 28px 0}
.color-btn,.color,.swatch-btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:9px 14px;
  border:1px solid var(--line);
  background:var(--panel-2);
  color:var(--text);
  border-radius:8px;
  cursor:pointer;
  font-weight:700;
  font-size:.88rem;
  transition:border-color .15s,transform .15s;
}
.color-btn:hover,.color:hover,.swatch-btn:hover{transform:translateY(-1px)}
.color-btn.active,.color.active,.swatch-btn.active{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent)}
.color-btn .swatch,.color .swatch{width:14px;height:14px;border-radius:4px;display:inline-block;border:1px solid rgba(255,255,255,.25)}
.swatch.black{background:#000}
.swatch.white{background:#fff}
.swatch.red{background:#ff0000}
.swatch.green{background:#00ff00}
.swatch.blue{background:#0000ff}
.swatch.yellow{background:#ffff00}
.swatch.cyan{background:#00ffff}
.swatch.magenta{background:#ff00ff}
.swatch.gray{background:#808080}
.swatch.darkgray{background:#101010}
button.swatch{width:34px;height:34px;border-radius:8px;border:1px solid var(--line);cursor:pointer;padding:0}
button.swatch.active{box-shadow:0 0 0 2px var(--accent)}
.small-btn{padding:9px 14px;border-radius:8px;border:1px solid var(--line);background:var(--panel-2);color:var(--text);cursor:pointer;font-weight:700;font-size:.85rem}
.test-controls{display:flex;align-items:center;gap:10px}
.tool-label{color:var(--accent);font-size:.78rem;font-weight:900;letter-spacing:.08em;display:block;margin-bottom:6px}
.test-screen{min-height:380px;background:#000;margin:0 20px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;color:#fff;border:1px solid #222;cursor:pointer;width:calc(100% - 40px)}
.test-screen:fullscreen{border-radius:0;margin:0;min-height:100vh;width:100%}
.screen-note{padding:18px 28px 26px;color:var(--muted);font-size:.9rem;display:grid;gap:4px}
.screen-note strong{color:var(--text)}
.tool-top{padding:26px 28px 20px;display:flex;justify-content:space-between;align-items:flex-start;gap:20px;flex-wrap:wrap}
.tool-top h2{margin:2px 0 6px;font-size:1.4rem}
.tool-top p{margin:0;color:var(--muted);font-size:.95rem}
.section-split{display:grid;grid-template-columns:2fr 1fr;gap:30px;align-items:start}
.fact-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius-sm);padding:20px;display:grid;gap:16px}
.fact span{display:block;color:var(--accent);font-size:.78rem;font-weight:900;letter-spacing:.06em;margin-bottom:4px}
.fact strong{font-size:.98rem}
.check-list{padding-left:1.2em;color:#c2ccd7}
.check-list li{margin-bottom:10px}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:start}
.info-panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius-sm);padding:22px}
.info-panel h3{margin-top:0}
.info-panel ol{color:#c2ccd7;padding-left:1.2em}
.small-note{color:var(--muted);font-size:.85rem;margin-top:16px}
@media(max-width:760px){
  .two-col{grid-template-columns:1fr}
}

/* pattern grid (contrast / uniformity / gradient-banding pages) */
.pattern-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;padding:22px 28px 0}
.pattern{
  text-align:left;
  border:1px solid var(--line);
  background:var(--panel-2);
  color:var(--text);
  border-radius:10px;
  padding:12px 14px;
  cursor:pointer;
}
.pattern b{display:block;font-size:.92rem;margin-bottom:2px}
.pattern span{display:block;font-size:.78rem;color:var(--muted)}
.pattern.active{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent)}

.tool-actions{display:flex;gap:10px;padding:22px 28px 0;flex-wrap:wrap}
.tool-actions .btn{flex:1;min-width:160px}
.tool-options{display:flex;align-items:center;gap:14px;padding:20px 28px 0;flex-wrap:wrap}
.tool-options label{font-size:.85rem;font-weight:700;color:var(--muted);display:flex;align-items:center;gap:10px}
.tool-options select{
  height:40px;border:1px solid var(--line);border-radius:8px;
  padding:0 10px;background:var(--panel-2);color:var(--text);
}
.tool-options input[type="range"]{width:160px;accent-color:var(--accent)}
.status-line{padding:16px 28px 0;color:var(--muted);font-size:.9rem}
.keyboard-note{padding:18px 28px 28px;margin:0;color:#8995a5;font-size:.85rem;text-align:center}
kbd{
  background:var(--panel-2);border:1px solid var(--line);border-bottom-width:2px;
  border-radius:5px;padding:1px 7px;font-size:.82em;font-family:inherit;color:var(--text);
}

/* guided overlay (created dynamically by black-screen-test script) */
.guided-overlay{
  position:fixed;left:50%;bottom:28px;transform:translateX(-50%);
  background:rgba(16,20,27,.95);border:1px solid var(--line);
  border-radius:999px;padding:10px 14px;display:flex;align-items:center;gap:12px;
  z-index:999;color:var(--text);font-size:.9rem;box-shadow:0 10px 30px rgba(0,0,0,.4);
}
.guided-overlay button{
  border:1px solid var(--line);background:var(--panel-2);color:var(--text);
  border-radius:999px;padding:7px 14px;cursor:pointer;font-weight:700;font-size:.82rem;
}
.guided-overlay button.next{background:#d7f3ff;color:#061019;border-color:transparent}

/* device grid (used by dead-pixel / black-screen-test device sections) */
.device-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:28px 0}
.device-grid > div{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius-sm);padding:16px}
.device-grid strong{display:block;margin-bottom:6px;font-size:.98rem}
.device-grid span{color:var(--muted);font-size:.88rem}


/* ---------- CONTACT FORM ---------- */
.contact-section{padding-top:44px}
.contact-grid{
  display:grid;
  grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);
  gap:34px;
  align-items:start;
}
.contact-copy h2{margin:0 0 14px;font-size:1.7rem}
.contact-copy p{color:#c2ccd7}
.contact-form{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:24px;
}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form-field{display:grid;gap:7px;margin-bottom:16px}
.form-field label{font-size:.86rem;font-weight:800;color:var(--text)}
.form-field label span{color:var(--accent)}
.form-field input,.form-field textarea{
  width:100%;
  border:1px solid var(--line);
  border-radius:9px;
  background:var(--panel-2);
  color:var(--text);
  padding:11px 13px;
  outline:none;
  transition:border-color .15s,box-shadow .15s;
}
.form-field input{height:44px}
.form-field textarea{min-height:150px;resize:vertical;line-height:1.55}
.form-field input:focus,.form-field textarea:focus{
  border-color:var(--accent);
  box-shadow:0 0 0 2px rgba(104,201,255,.12);
}
.btn-submit{width:100%;justify-content:center;margin-top:2px}
.form-help{margin:12px 0 0;color:#8995a5;font-size:.8rem;text-align:center}
.form-status{
  margin:0 0 22px;
  padding:14px 16px;
  border-radius:var(--radius-sm);
  font-size:.92rem;
}
.form-status.success{
  background:rgba(104,201,255,.08);
  border:1px solid rgba(104,201,255,.35);
  color:#d7f3ff;
}
.form-status.error{
  background:rgba(255,180,84,.08);
  border:1px solid rgba(255,180,84,.35);
  color:#ffd39a;
}
.hp-field{
  position:absolute!important;
  left:-10000px!important;
  width:1px!important;
  height:1px!important;
  overflow:hidden!important;
}
@media(max-width:760px){
  .contact-grid{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr;gap:0}
}


/* ---------- HOMEPAGE ALIGNMENT ---------- */
/* Keep homepage text and card sections on the same centered content axis. */
.home-page .section > .content{
  width:min(1080px,92%);
  max-width:1080px;
  margin-left:auto;
  margin-right:auto;
}
.home-page .section > .wrap-narrow{
  width:min(1080px,92%);
  max-width:1080px;
  margin-left:auto;
  margin-right:auto;
}
.home-page .section .card-grid,
.home-page .section .link-card-grid{
  width:100%;
  margin-left:0;
  margin-right:0;
}


/* ---------- CONTACT FORM / HOMEPAGE FINAL ALIGNMENT ---------- */
.contact-section .wrap-narrow{width:min(1080px,92%);max-width:1080px;margin-left:auto;margin-right:auto}
.contact-section .contact-grid{width:100%;margin:0 auto;display:grid;grid-template-columns:minmax(0,.82fr) minmax(0,1.18fr);gap:36px;align-items:start}
.contact-form{display:block;width:100%;min-width:0}
.contact-form .form-row{width:100%}
.contact-form .form-field{width:100%}
.contact-form .form-field label{display:block;margin:0}
.contact-form .form-field input,.contact-form .form-field textarea,.contact-form input[type="email"],.contact-form input[type="text"]{display:block;width:100%;max-width:100%;background:#141922;color:#f4f7fb;border:1px solid #2a3544;border-radius:9px;padding:11px 13px}
.contact-form .form-field input{height:44px}
.contact-form .form-field textarea{min-height:170px}
.contact-form .btn-submit{width:100%}

.home-page main .section > .content,
.home-page main .section > .wrap-narrow,
.home-page main .section > .home-section-inner{width:min(1080px,92%);max-width:1080px;margin-left:auto;margin-right:auto}
.home-page main .section > .content{padding-left:0;padding-right:0}
.home-page main .section > .wrap-narrow.card-grid,
.home-page main .section > .wrap-narrow.link-card-grid{display:grid;margin-left:auto;margin-right:auto}
.home-page .card-grid.cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.home-page .link-card-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
@media(max-width:900px){
  .home-page .card-grid.cols-4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .home-page .link-card-grid{grid-template-columns:1fr}
}
@media(max-width:760px){
  .contact-section .contact-grid{grid-template-columns:1fr;gap:24px}
  .contact-form .form-row{grid-template-columns:1fr;gap:0}
  .home-page .card-grid.cols-4{grid-template-columns:1fr}
}

/* ---------- FOOTER ---------- */
footer.site-footer{border-top:1px solid var(--line);padding:36px 0 22px;margin-top:20px}
.footer-inner{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap}
.footer-brand p{color:#8995a5;font-size:.9rem;margin:8px 0 0}
.footer-links{display:flex;flex-wrap:wrap;gap:16px 22px;font-size:.88rem}
.footer-links a{color:#c7d0dc}
.footer-links a:hover{color:var(--text)}
.copyright{color:#8995a5;font-size:.82rem;margin-top:26px;padding-top:18px;border-top:1px solid var(--line)}

/* ---------- MISC ---------- */
.center{text-align:center}

/* ---------- RESPONSIVE ---------- */
@media(max-width:760px){
  .card-grid,.card-grid.cols-4{grid-template-columns:1fr 1fr}
  .link-card-grid{grid-template-columns:1fr}
  .device-grid{grid-template-columns:1fr}
  .pattern-grid{grid-template-columns:1fr 1fr}
  .hero{padding-top:56px}
  .tool-head{padding:22px 20px 16px}
  .screen-stage{margin:0 14px;min-height:260px}
  .color-row,.pattern-grid,.tool-actions,.tool-options,.status-line{padding-left:20px;padding-right:20px}
  .keyboard-note{padding:16px 20px 24px}
}
@media(max-width:520px){
  .card-grid,.card-grid.cols-4,.card-grid.cols-2,.pattern-grid{grid-template-columns:1fr}
  .footer-inner{flex-direction:column}
}

@media(max-width:760px){
  .nav-row{position:relative;min-height:64px;}
  .site-menu-toggle{display:block;}
  .site-nav{
    display:none;
    position:absolute;
    top:calc(100% + 1px);
    left:0;
    right:0;
    flex-direction:column;
    gap:0;
    padding:8px;
    background:#080b10;
    border:1px solid var(--line);
    border-top:0;
    border-radius:0 0 12px 12px;
    box-shadow:0 12px 28px rgba(0,0,0,.35);
    overflow:visible;
  }
  .site-nav.menu-open{display:flex;}
  .site-nav a{padding:11px 12px;font-size:.95rem;border-radius:7px;}
  .site-nav a:hover{background:var(--panel-2);}
  .stage-message small{display:block;color:#8f9baa;font-size:.76rem;line-height:1.5;}
}