:root{--brand:#e8400a;--brand-bg:rgba(232,64,10,.09);--bg:#ffffff;--bg2:#f7f7f7;--bg3:#efefef;--border:#e0e0e0;--text:#111111;--text2:#444444;--muted:#777777;--card:#ffffff;--nav-bg:rgba(255,255,255,.96);--shadow:0 2px 14px rgba(0,0,0,.07);--shadow-lg:0 8px 36px rgba(0,0,0,.12);--radius:12px;--mono:'JetBrains Mono',monospace;--sans:'Inter',sans-serif;--fs-nav:16px;--fs-body:21px;--fs-small:16px;--fs-h1:48px;--fs-h2:40px;}
html.dark{--bg:#111111;--bg2:#1a1a1a;--bg3:#252525;--border:#333333;--text:#eeeeee;--text2:#cccccc;--muted:#888888;--card:#1a1a1a;--nav-bg:rgba(17,17,17,.96);--shadow:0 2px 14px rgba(0,0,0,.4);--shadow-lg:0 8px 36px rgba(0,0,0,.6);}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--sans);background:var(--bg);color:var(--text);font-size:var(--fs-body);line-height:1.65;overflow-x:hidden;transition:background .25s,color .25s;}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4,h5,h6{font-family:var(--sans);font-weight:700;letter-spacing:-.03em;line-height:1.15;-webkit-font-smoothing:antialiased;}

/* NAV */
nav{position:sticky;top:0;z-index:200;background:var(--nav-bg);backdrop-filter:blur(16px);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 28px;height:62px;box-shadow:var(--shadow);gap:12px;}
.nav-logo{font-weight:800;font-size:1.1rem;letter-spacing:-.5px;display:flex;align-items:center;gap:6px;white-space:nowrap;}
.nav-logo .hash{color:var(--brand);font-size:1.35rem;}
.nav-links{display:flex;align-items:center;gap:2px;list-style:none;}
.nav-links a{display:flex;align-items:center;gap:5px;padding:6px 11px;border-radius:8px;font-size:var(--fs-nav);font-weight:600;color:var(--text2);transition:background .15s,color .15s;}
.nav-links a:hover,.nav-links a.active{background:var(--bg3);color:var(--brand);}
.nav-links svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0;}
.nav-right{display:flex;align-items:center;gap:8px;}
.theme-toggle{display:flex;align-items:center;background:var(--bg3);border:1.5px solid var(--border);border-radius:50px;padding:3px;gap:2px;}
.tbtn{width:30px;height:30px;border-radius:50px;border:none;background:transparent;cursor:pointer;font-size:13px;display:flex;align-items:center;justify-content:center;transition:background .2s;color:var(--muted);}
.tbtn.act{background:var(--brand);color:#fff;}

/* BREADCRUMB */
.breadcrumb{max-width:1100px;margin:0 auto;padding:14px 24px 0;font-size:var(--fs-small);color:var(--muted);display:flex;align-items:center;gap:6px;flex-wrap:wrap;}
.breadcrumb a{color:var(--brand);font-weight:600;}
.breadcrumb a:hover{text-decoration:underline;}

/* HERO */
.page-hero{padding:52px 24px 44px;max-width:1100px;margin:0 auto;}
.page-hero .badge{display:inline-flex;align-items:center;gap:6px;background:var(--brand-bg);color:var(--brand);border:1px solid rgba(232,64,10,.2);border-radius:50px;padding:4px 14px;font-size:var(--fs-small);font-weight:700;letter-spacing:.07em;text-transform:uppercase;margin-bottom:18px;}
.page-hero h1{font-size:var(--fs-h1);font-weight:700;letter-spacing:-.04em;margin-bottom:16px;max-width:750px;}
.page-hero h1 em{color:var(--brand);font-style:normal;}
.page-hero .lead{font-size:var(--fs-body);color:var(--text2);max-width:640px;margin-bottom:28px;line-height:1.7;}
.hero-stats{display:flex;gap:32px;flex-wrap:wrap;}
.hero-stat{display:flex;flex-direction:column;}
.hero-stat .n{font-size:1.5rem;font-weight:700;color:var(--brand);letter-spacing:-.04em;}
.hero-stat .l{font-size:var(--fs-small);color:var(--muted);font-weight:600;margin-top:1px;}

/* TOOL TABS */
.tool-section{background:var(--bg2);border-top:1px solid var(--border);border-bottom:1px solid var(--border);}
.tool-inner{max-width:1100px;margin:0 auto;padding:0 24px;}
.tab-bar{display:flex;border-bottom:1px solid var(--border);overflow-x:auto;scrollbar-width:none;}
.tab-bar::-webkit-scrollbar{display:none;}
.tab-btn{display:flex;align-items:center;gap:7px;padding:14px 18px;font-size:var(--fs-nav);font-weight:700;color:var(--muted);border:none;background:none;cursor:pointer;border-bottom:3px solid transparent;margin-bottom:-1px;transition:color .15s,border-color .15s;white-space:nowrap;font-family:var(--sans);}
.tab-btn svg{width:17px;height:17px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;}
.tab-btn.active{color:var(--brand);border-bottom-color:var(--brand);}
.tab-btn:hover:not(.active){color:var(--text);}
.tab-pane{display:none;padding:32px 0;}
.tab-pane.active{display:block;}

/* PICKER */
.picker-grid{display:grid;grid-template-columns:1fr 340px;gap:24px;align-items:start;}
.picker-canvas-wrap{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);}
#mainCanvas{width:100%;aspect-ratio:1/.6;border-radius:9px;cursor:crosshair;display:block;touch-action:none;}
.hue-row{position:relative;margin-top:12px;height:20px;}
#hueSlider{width:100%;height:20px;border-radius:10px;cursor:pointer;display:block;}
.hue-knob{position:absolute;top:50%;transform:translate(-50%,-50%);width:24px;height:24px;border-radius:50%;border:3px solid white;box-shadow:0 1px 6px rgba(0,0,0,.45);pointer-events:none;left:4%;}
.alpha-row{position:relative;margin-top:10px;height:20px;}
#alphaSlider{width:100%;height:20px;border-radius:10px;cursor:pointer;display:block;}
.alpha-knob{position:absolute;top:50%;transform:translate(-50%,-50%);width:24px;height:24px;border-radius:50%;border:3px solid white;box-shadow:0 1px 6px rgba(0,0,0,.45);pointer-events:none;left:100%;}
.color-preview-bar{height:44px;border-radius:9px;margin-top:14px;cursor:pointer;transition:background .1s;display:flex;align-items:center;justify-content:center;font-size:var(--fs-small);font-weight:700;gap:7px;border:1px solid rgba(0,0,0,.07);}
.values-panel{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:10px;}
.val-row{display:flex;align-items:center;gap:10px;}
.val-row label{width:52px;font-size:var(--fs-small);font-weight:700;color:var(--muted);letter-spacing:.06em;text-transform:uppercase;flex-shrink:0;}
.val-row input{flex:1;background:var(--bg3);border:1px solid var(--border);color:var(--text);border-radius:7px;padding:8px 10px;font-family:var(--mono);font-size:.82rem;transition:border-color .2s;min-width:0;}
.val-row input:focus{outline:none;border-color:var(--brand);}
.copy-btn{width:34px;height:34px;border-radius:7px;border:1px solid var(--border);background:var(--bg3);cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .15s,border-color .15s;color:var(--muted);}
.copy-btn:hover{background:var(--brand);border-color:var(--brand);color:white;}
.copy-btn svg{width:15px;height:15px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;}
.panel-divider{border:none;border-top:1px solid var(--border);margin:4px 0;}
.panel-label{font-size:.68rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:2px;}
.harmony-row{display:flex;gap:7px;flex-wrap:wrap;margin-top:4px;}
.h-dot{width:36px;height:36px;border-radius:7px;cursor:pointer;border:2px solid rgba(0,0,0,.08);transition:transform .15s;display:flex;align-items:flex-end;justify-content:center;padding-bottom:2px;}
.h-dot:hover{transform:scale(1.12);}
.h-dot span{font-size:.44rem;font-family:var(--mono);color:white;text-shadow:0 1px 3px rgba(0,0,0,.8);}
.harm-select{width:100%;background:var(--bg3);border:1px solid var(--border);color:var(--text);border-radius:7px;padding:7px 10px;font-size:var(--fs-small);font-family:var(--sans);font-weight:600;margin-bottom:8px;}
.quick-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:6px;}
.qa-btn{padding:6px 13px;border-radius:7px;border:1px solid var(--border);background:var(--bg3);font-size:var(--fs-small);font-weight:700;color:var(--text2);cursor:pointer;transition:all .15s;font-family:var(--sans);}
.qa-btn:hover{border-color:var(--brand);color:var(--brand);background:var(--brand-bg);}
.qa-btn.primary{background:var(--brand);color:white;border-color:var(--brand);}
.qa-btn.primary:hover{opacity:.88;}

/* IMAGE PICKER */
.img-picker-wrap{display:flex;flex-direction:column;align-items:center;gap:20px;}
.img-drop-zone{width:100%;max-width:700px;min-height:200px;border:2px dashed var(--border);border-radius:var(--radius);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;cursor:pointer;transition:border-color .2s,background .2s;padding:32px;background:var(--card);}
.img-drop-zone:hover{border-color:var(--brand);background:var(--brand-bg);}
.img-drop-zone svg{width:40px;height:40px;stroke:var(--muted);fill:none;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;}
.img-drop-zone p{font-size:var(--fs-body);color:var(--muted);text-align:center;}
.img-drop-zone span{font-size:var(--fs-small);color:var(--muted);}
#imgCanvas{max-width:100%;border-radius:var(--radius);cursor:crosshair;display:none;border:1px solid var(--border);}
.img-result{display:flex;align-items:center;gap:14px;flex-wrap:wrap;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:16px 20px;min-width:280px;}
.img-swatch{width:48px;height:48px;border-radius:9px;border:1px solid var(--border);flex-shrink:0;}
.img-vals{display:flex;flex-direction:column;gap:4px;}
.img-vals span{font-family:var(--mono);font-size:.84rem;color:var(--text2);}

/* PALETTE */
.palette-controls{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:20px;align-items:center;}
.palette-grid{display:flex;height:80px;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);}
.palette-swatch{flex:1;cursor:pointer;display:flex;align-items:flex-end;justify-content:center;padding-bottom:6px;transition:flex .3s;position:relative;}
.palette-swatch:hover{flex:2;}
.palette-swatch span{font-size:.55rem;font-family:var(--mono);color:white;text-shadow:0 1px 4px rgba(0,0,0,.7);opacity:0;transition:opacity .2s;}
.palette-swatch:hover span{opacity:1;}
.palette-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:10px;margin-top:16px;}
.pal-card{border-radius:9px;overflow:hidden;border:1px solid var(--border);box-shadow:var(--shadow);cursor:pointer;transition:transform .15s;}
.pal-card:hover{transform:translateY(-2px);}
.pal-card .swatch{height:52px;}
.pal-card .info{padding:7px 10px;background:var(--card);}
.pal-card .info code{font-family:var(--mono);font-size:.74rem;color:var(--brand);display:block;}
.pal-card .info small{font-size:.7rem;color:var(--muted);}

/* CONTRAST */
.contrast-wrap{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
.contrast-preview{border-radius:var(--radius);padding:28px;min-height:160px;display:flex;flex-direction:column;justify-content:center;gap:8px;border:1px solid var(--border);}
.contrast-preview h3{font-size:1.5rem;}
.contrast-preview p{font-size:var(--fs-body);}
.contrast-score{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;}
.score-big{font-size:3rem;font-weight:700;letter-spacing:-.05em;font-family:var(--sans);}
.score-big.pass{color:#16a34a;}
.score-big.fail{color:#dc2626;}
.badge-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px;}
.wcag-badge{padding:4px 12px;border-radius:20px;font-size:var(--fs-small);font-weight:700;font-family:var(--sans);}
.wcag-badge.pass{background:#dcfce7;color:#15803d;}
.wcag-badge.fail{background:#fee2e2;color:#b91c1c;}

/* GRADIENT */
.gradient-preview{height:120px;border-radius:var(--radius);margin-bottom:16px;border:1px solid var(--border);cursor:pointer;transition:box-shadow .2s;}
.gradient-preview:hover{box-shadow:var(--shadow-lg);}
.gradient-stops{display:flex;gap:10px;margin-bottom:14px;flex-wrap:wrap;align-items:center;}
.grad-stop{display:flex;align-items:center;gap:8px;}
.grad-swatch{width:32px;height:32px;border-radius:6px;cursor:pointer;border:2px solid var(--border);}
.gradient-code{background:var(--bg3);border:1px solid var(--border);border-radius:8px;padding:12px 14px;font-family:var(--mono);font-size:.82rem;color:var(--brand);display:flex;align-items:center;justify-content:space-between;gap:10px;}
.gradient-code span{flex:1;word-break:break-all;}

/* SECTIONS */
.content-section{max-width:1100px;margin:0 auto;padding:60px 24px;}
.content-section h2{font-size:var(--fs-h2);font-weight:700;letter-spacing:-.04em;margin-bottom:16px;}
.content-section .intro{font-size:var(--fs-body);color:var(--text2);max-width:760px;line-height:1.75;margin-bottom:32px;}
.hr{border:none;border-top:1px solid var(--border);margin:0;}

/* FEATURES */
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px;margin-top:8px;}
.feature-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);transition:transform .2s,box-shadow .2s;}
.feature-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);}
.feature-card .icon{width:44px;height:44px;border-radius:10px;background:var(--brand-bg);display:flex;align-items:center;justify-content:center;margin-bottom:14px;}
.feature-card .icon svg{width:22px;height:22px;stroke:var(--brand);fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;}
.feature-card h3{font-size:var(--fs-body);font-weight:700;margin-bottom:7px;}
.feature-card p{font-size:var(--fs-small);color:var(--muted);line-height:1.65;}

/* STEPS */
.steps-list{display:flex;flex-direction:column;gap:20px;margin-top:8px;}
.step{display:flex;gap:18px;align-items:flex-start;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px 24px;box-shadow:var(--shadow);}
.step-num{width:36px;height:36px;border-radius:50%;background:var(--brand);color:white;font-weight:700;font-size:var(--fs-body);display:flex;align-items:center;justify-content:center;flex-shrink:0;font-family:var(--sans);}
.step-body h3{font-size:var(--fs-body);font-weight:700;margin-bottom:5px;}
.step-body p{font-size:var(--fs-small);color:var(--muted);line-height:1.65;}

/* USE CASES */
.use-cases-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;}
.use-case{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);}
.use-case .uc-icon{font-size:1.6rem;margin-bottom:10px;}
.use-case h3{font-size:var(--fs-body);font-weight:700;margin-bottom:6px;}
.use-case p{font-size:var(--fs-small);color:var(--muted);line-height:1.6;}

/* TIPS */
.tips-two-col{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
.tip-block{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);}
.tip-block h3{font-size:var(--fs-body);font-weight:700;margin-bottom:8px;}
.tip-block p{font-size:var(--fs-small);color:var(--muted);line-height:1.65;}
.tip-block ul{font-size:var(--fs-small);color:var(--muted);line-height:1.8;padding-left:18px;margin-top:6px;}
.tip-block li{margin-bottom:3px;}

/* TABLE */
.compare-table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow);}
.compare-table{width:100%;border-collapse:collapse;font-size:var(--fs-small);}
.compare-table thead tr{background:var(--bg2);}
.compare-table th{padding:12px 16px;text-align:left;font-size:var(--fs-small);font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);}
.compare-table tbody tr{border-top:1px solid var(--border);}
.compare-table tbody tr:hover{background:var(--bg2);}
.compare-table td{padding:11px 16px;color:var(--text2);}
.compare-table td:first-child{font-weight:700;font-family:var(--mono);color:var(--brand);}
.check{color:#16a34a;font-weight:700;}
.cross{color:#dc2626;}

/* FAQ */
.faq-list{display:flex;flex-direction:column;gap:9px;}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;}
.faq-q{width:100%;text-align:left;background:none;border:none;cursor:pointer;padding:17px 20px;font-size:var(--fs-body);font-weight:700;color:var(--text);display:flex;align-items:center;justify-content:space-between;gap:12px;transition:background .15s;font-family:var(--sans);}
.faq-q:hover{background:var(--bg2);}
.faq-q .arr{font-size:.85rem;color:var(--muted);transition:transform .25s;flex-shrink:0;}
.faq-q.open .arr{transform:rotate(180deg);}
.faq-a{display:none;padding:0 20px 16px;font-size:var(--fs-body);color:var(--text2);line-height:1.75;}
.faq-a.show{display:block;}

/* PROSE */
.prose{max-width:820px;}
.prose h2{font-size:var(--fs-h2);font-weight:700;letter-spacing:-.04em;margin-bottom:14px;margin-top:40px;}
.prose h2:first-child{margin-top:0;}
.prose h3{font-size:var(--fs-body);font-weight:700;margin:28px 0 8px;color:var(--brand);}
.prose p{font-size:var(--fs-body);color:var(--text2);margin-bottom:16px;line-height:1.78;}
.prose ul,.prose ol{font-size:var(--fs-body);color:var(--text2);padding-left:22px;line-height:1.8;margin-bottom:16px;}
.prose li{margin-bottom:5px;}
.prose strong{color:var(--text);font-weight:700;}
.prose code{font-family:var(--mono);font-size:.84rem;background:var(--bg3);padding:2px 6px;border-radius:4px;color:var(--brand);}
.callout{background:var(--brand-bg);border-left:4px solid var(--brand);border-radius:0 9px 9px 0;padding:16px 20px;margin:20px 0;font-size:var(--fs-body);color:var(--text2);line-height:1.72;}
.callout strong{color:var(--brand);}

/* RELATED */
.related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px;margin-top:8px;}
.related-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow);display:flex;align-items:center;gap:14px;transition:transform .2s,box-shadow .2s;cursor:pointer;}
.related-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);color:var(--brand);}
.rc-icon{width:40px;height:40px;border-radius:9px;background:var(--brand-bg);display:flex;align-items:center;justify-content:center;flex-shrink:0;}
.rc-icon svg{width:20px;height:20px;stroke:var(--brand);fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;}
.related-card h4{font-size:var(--fs-nav);font-weight:700;margin-bottom:2px;}
.related-card p{font-size:var(--fs-small);color:var(--muted);}

/* FOOTER */
.ft-wrap{border-top:1px solid var(--border);background:var(--bg2);}
footer{padding:44px 24px 28px;max-width:1100px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:28px;}
footer h4{font-size:var(--fs-small);font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:12px;}
footer ul{list-style:none;}
footer ul li{margin-bottom:7px;}
footer ul li a{font-size:var(--fs-small);color:var(--muted);transition:color .15s;font-weight:500;}
footer ul li a:hover{color:var(--brand);}
.ft-brand p{font-size:var(--fs-small);color:var(--muted);margin-top:7px;max-width:210px;line-height:1.55;}
.ft-bottom{border-top:1px solid var(--border);padding:16px 24px;text-align:center;font-size:var(--fs-small);color:var(--muted);max-width:1100px;margin:0 auto;}

/* TOAST */
#toast{position:fixed;bottom:22px;right:22px;z-index:9999;background:var(--text);color:var(--bg);border-radius:9px;padding:10px 16px;font-size:var(--fs-small);font-weight:600;transform:translateY(60px);opacity:0;transition:.28s;pointer-events:none;font-family:var(--sans);}
#toast.show{transform:translateY(0);opacity:1;}

@media(max-width:700px){
  .picker-grid{grid-template-columns:1fr;}
  .tips-two-col{grid-template-columns:1fr;}
  .contrast-wrap{grid-template-columns:1fr;}
  :root{--fs-h1:36px;--fs-h2:28px;--fs-body:18px;}
  .nav-links{display:none;}
}
@media(max-width:700px){
  :root{--fs-h1:30px;--fs-h2:24px;}
  .hero-stats{gap:18px;}
  nav{padding:0 16px;}
}