/* The Beauty Tech Lab: design system.
   Warm palette (burgundy, rose gold, old rose, blush), one clickable colour (--signal), line icons, mono "readout" labels, ruler motif.
   Category colour comes from style="--cc:..." on <body> or a card. */
:root{
  --paper:#FBF6F4; --white:#FFFFFF; --ink:#2B1820; --slate:#5C4850; --mute:#7A636B;
  --line:#EEE1DF; --line-2:#DFCACA; --well:#F7EBE8;
  --signal:#7D1F3E; --signal-2:#5F1530; --tint:#F8E5E8; --accent:#B76E79;
  --rose-gold:linear-gradient(100deg,#B76E79 0%,#E7B7A9 45%,#C4877F 70%,#B76E79 100%);
  --deep:#3A1424; --on-deep:#F5E6E3; --on-deep-mute:#C9A9AE; --deep-line:#57263A; --blush:#F0B7BF; --on-deep-link:#F7CDD3;
  --cc:#7D1F3E;
  --f-head:"Inter Tight","Inter",system-ui,sans-serif; --f-body:"Inter",system-ui,sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --wrap:1160px; --r:10px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.65 var(--f-body);text-rendering:optimizeLegibility}
img,svg{max-width:100%}
a{color:var(--signal);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--signal-2)}
:focus-visible{outline:3px solid var(--signal);outline-offset:2px;border-radius:4px}
h1,h2,h3,h4{font-family:var(--f-head);line-height:1.15;letter-spacing:-.015em;margin:0 0 .5em;color:var(--ink)}
h1{font-size:clamp(2.1rem,4.6vw,3.4rem);font-weight:650}
h2{font-size:clamp(1.5rem,2.6vw,2rem);font-weight:650;margin-top:1.6em}
h3{font-size:1.2rem;font-weight:650}
p{margin:0 0 1em}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.mono,.kicker{font-family:var(--f-mono);font-size:.78rem;font-weight:500;letter-spacing:.06em;text-transform:uppercase;color:var(--mute);line-height:1.5}
.kicker .dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--cc);margin-right:8px;vertical-align:1px}
.skip{position:absolute;left:-999px}.skip:focus{left:16px;top:12px;z-index:100;background:var(--white);padding:8px 12px}
[id]{scroll-margin-top:84px}

/* ruler motif */
.ruler{height:14px;background:
  repeating-linear-gradient(90deg,var(--line-2) 0 1px,transparent 1px 10px) bottom/100% 6px no-repeat,
  repeating-linear-gradient(90deg,var(--ink) 0 1px,transparent 1px 50px) bottom/100% 12px no-repeat;opacity:.55}

/* header */
.top{position:sticky;top:0;z-index:50;background:rgba(255,252,251,.94);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:28px;height:68px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font:650 1.06rem/1 var(--f-head);letter-spacing:-.01em;white-space:nowrap}
.logo b{font:500 .72rem/1 var(--f-mono);letter-spacing:.08em;color:var(--white);background:var(--signal);box-shadow:inset 0 -2px 0 #C4877F;padding:4px 6px;border-radius:4px;margin-left:2px}
.nav{display:flex;align-items:center;gap:6px;margin-left:auto}
.nav a,.nav summary{display:block;padding:8px 12px;border-radius:8px;color:var(--ink);text-decoration:none;font:500 .95rem/1.2 var(--f-body);cursor:pointer;list-style:none}
.nav summary::-webkit-details-marker{display:none}
.nav summary::after{content:"";display:inline-block;width:6px;height:6px;border-right:1.5px solid var(--slate);border-bottom:1.5px solid var(--slate);transform:rotate(45deg);margin:0 0 3px 8px}
.nav a:hover,.nav summary:hover,.nav details[open] summary{background:var(--well)}
.nav a[aria-current],.nav details.cur summary{color:var(--signal)}
.nav details{position:relative}
.nav .menu{position:absolute;right:0;top:calc(100% + 8px);min-width:260px;background:var(--white);border:1px solid var(--line);border-radius:12px;box-shadow:0 14px 40px rgba(43,24,32,.12);padding:8px}
.nav .menu a{display:flex;gap:12px;align-items:center;padding:10px 12px}
.nav .menu a span{display:block;font:500 .7rem/1 var(--f-mono);color:var(--mute);letter-spacing:.06em}
.burger{display:none;margin-left:auto}
.burger summary{list-style:none;cursor:pointer;padding:10px;border-radius:8px}
.burger summary::-webkit-details-marker{display:none}
.burger .panel{position:absolute;left:0;right:0;top:68px;background:var(--white);border-bottom:1px solid var(--line);padding:12px 24px 20px;box-shadow:0 14px 40px rgba(43,24,32,.12)}
.burger .panel a{display:flex;gap:12px;align-items:center;padding:12px 4px;border-bottom:1px solid var(--line);color:var(--ink);text-decoration:none;font-weight:500}
.burger .panel .grp{margin:14px 0 2px}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:10px;background:var(--signal);color:#fff;text-decoration:none;font:600 .95rem/1 var(--f-body);padding:13px 18px;border-radius:9px;border:0}
.btn::after{content:"→";font-family:var(--f-body)}
.btn:hover{background:var(--signal-2);color:#fff}
.btn.ghost{background:transparent;color:var(--signal);box-shadow:inset 0 0 0 1.5px var(--signal)}
.btn.ghost:hover{background:var(--tint)}

/* homepage */
.hero{background:var(--white);border-bottom:1px solid var(--line);position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:
  linear-gradient(var(--line) 1px,transparent 1px) 0 0/40px 40px,linear-gradient(90deg,var(--line) 1px,transparent 1px) 0 0/40px 40px;opacity:.55;
  -webkit-mask:linear-gradient(90deg,transparent,#000 55%);mask:linear-gradient(90deg,transparent,#000 55%)}
.hero .wrap{position:relative;display:grid;grid-template-columns:1.25fr .9fr;gap:56px;align-items:center;padding-top:72px;padding-bottom:72px}
.hero h1{font-size:clamp(2.5rem,6vw,4.4rem);margin:.35em 0 .35em}
.hero h1 em{font-style:normal;color:var(--signal)}
.lede{font-size:1.18rem;color:var(--slate);max-width:60ch}
.hero .ctas{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}
.readout{background:var(--deep);color:var(--on-deep);border-radius:14px;padding:22px 24px;font-family:var(--f-mono);font-size:.86rem;box-shadow:0 30px 60px rgba(58,20,36,.28)}
.readout .rh{display:flex;justify-content:space-between;color:var(--on-deep-mute);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;border-bottom:1px solid var(--deep-line);padding-bottom:12px;margin-bottom:6px}
.readout .rh i{font-style:normal;color:var(--blush)}
.readout dl{margin:0;display:grid;grid-template-columns:1fr auto;gap:0}
.readout dt,.readout dd{margin:0;padding:10px 0;border-bottom:1px dashed var(--deep-line)}
.readout dd{color:#fff;text-align:right}
.readout .bar{height:6px;background:var(--deep-line);border-radius:3px;margin:14px 0 4px;overflow:hidden}
.readout .bar span{display:block;height:100%;width:var(--w);background:var(--rose-gold)}
.readout small{color:var(--on-deep-mute)}

.sec{padding:64px 0}
.sec-head{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:28px}
.sec-head h2{margin:0}
.sec-head p{margin:.4em 0 0;color:var(--slate)}
.cats{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px}
.cat{position:relative;display:flex;flex-direction:column;background:var(--white);border:1px solid var(--line);border-radius:var(--r);padding:20px;text-decoration:none;color:var(--ink);transition:border-color .15s,box-shadow .15s,transform .15s}
.cat::before{content:"";position:absolute;left:0;top:0;right:0;height:3px;background:var(--cc);border-radius:var(--r) var(--r) 0 0}
.cat:hover{border-color:var(--line-2);box-shadow:0 10px 30px rgba(43,24,32,.08);transform:translateY(-2px);color:var(--ink)}
.cat .r{display:flex;justify-content:space-between;align-items:start;margin-bottom:18px}
.cat .ic{width:52px;height:52px;border-radius:10px;background:var(--well);display:grid;place-items:center}
.cat h3{margin:0 0 6px}
.cat ul{list-style:none;padding:0;margin:10px 0 0;border-top:1px solid var(--line);padding-top:10px;font-size:.88rem;color:var(--slate)}
.cat li{padding:3px 0}
.cat li::before{content:"— ";color:var(--cc)}
.band{background:var(--deep);color:var(--on-deep)}
.band h2{color:#fff;margin-top:0}
.band .wrap{display:grid;grid-template-columns:1fr 1.1fr;gap:48px;padding-top:64px;padding-bottom:64px}
.band ol{list-style:none;counter-reset:s;padding:0;margin:0}
.band li{counter-increment:s;display:grid;grid-template-columns:56px 1fr;gap:12px;padding:14px 0;border-top:1px solid var(--deep-line)}
.band li::before{content:"0" counter(s);font:500 .8rem/1.9 var(--f-mono);color:var(--blush)}
.band li b{color:#fff;display:block}
.band a{color:var(--on-deep-link)}
.band .kicker{color:var(--on-deep-mute)}

/* guide pages */
.ghead{background:var(--white);border-bottom:1px solid var(--line);border-top:3px solid var(--cc)}
.ghead .wrap{padding-top:40px;padding-bottom:36px;display:grid;grid-template-columns:1fr auto;gap:40px;align-items:end}
.crumbs{font:500 .8rem/1.5 var(--f-mono);color:var(--mute);margin-bottom:18px}
.crumbs a{color:var(--mute);text-decoration:none}.crumbs a:hover{color:var(--signal)}
.ghead h1{margin:.3em 0 .35em;max-width:20ch}
.byline{font-size:.9rem;color:var(--mute);margin-top:18px}
.ghead .gi{width:132px;height:132px;border:1px solid var(--line);border-radius:16px;display:grid;place-items:center;background:
  linear-gradient(var(--line) 1px,transparent 1px) 0 0/16px 16px,linear-gradient(90deg,var(--line) 1px,transparent 1px) 0 0/16px 16px,var(--paper)}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:48px;padding-top:40px;padding-bottom:72px}
.article>section:first-child h2{margin-top:0}
.side{position:sticky;top:92px;align-self:start}
.toc{background:var(--white);border:1px solid var(--line);border-radius:var(--r);padding:18px 18px 10px}
.toc ol{list-style:none;counter-reset:t;padding:0;margin:10px 0 0}
.toc li{counter-increment:t;border-top:1px solid var(--line)}
.toc a{display:grid;grid-template-columns:28px 1fr;padding:9px 0;text-decoration:none;color:var(--ink);font-size:.92rem}
.toc a::before{content:counter(t,decimal-leading-zero);font:500 .75rem/1.9 var(--f-mono);color:var(--mute)}
.toc a:hover{color:var(--signal)}
.note{background:var(--tint);border-left:3px solid var(--accent);border-radius:0 var(--r) var(--r) 0;padding:14px 18px;font-size:.93rem;color:var(--slate);margin:0 0 28px}
.note b{color:var(--ink)}

.picks{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:8px 0 12px}
.pick{background:var(--white);border:1px solid var(--line);border-radius:var(--r);padding:18px;display:flex;flex-direction:column}
.pick .mono{color:var(--cc)}
.pick h3{font-size:1.02rem;margin:8px 0 14px}
.pick .btn{margin-top:auto;justify-content:center;font-size:.9rem;padding:11px 14px}

.product{background:var(--white);border:1px solid var(--line);border-radius:14px;margin:28px 0;overflow:hidden}
.product .ph{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:16px 22px;border-bottom:1px solid var(--line);background:linear-gradient(90deg,var(--well),var(--white))}
.product .ph .mono{color:var(--ink)}
.product .ph .no{font:500 .78rem/1 var(--f-mono);color:var(--white);background:var(--cc);padding:5px 8px;border-radius:5px}
.product .pb{padding:22px}
.product h3{font-size:1.45rem;margin:0 0 10px}
.spec{display:grid;grid-template-columns:max-content 1fr;margin:18px 0;border-top:1px solid var(--line)}
.spec dt,.spec dd{margin:0;padding:10px 0;border-bottom:1px solid var(--line)}
.spec dt{font:500 .76rem/1.9 var(--f-mono);letter-spacing:.06em;text-transform:uppercase;color:var(--mute);padding-right:24px}
.fit{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:18px 0}
.fit div{border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;font-size:.95rem}
.fit b{display:block;font:500 .74rem/1.6 var(--f-mono);letter-spacing:.06em;text-transform:uppercase;margin-bottom:4px}
.fit .yes b{color:#2F6B4F}.fit .no b{color:#A33A3A}
.matters{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.matters div{background:var(--white);border:1px solid var(--line);border-radius:var(--r);padding:18px}
.matters h3{font-size:1.05rem}
.matters p{margin:0;color:var(--slate);font-size:.96rem}
.testbox{background:var(--deep);color:var(--on-deep);border-radius:14px;padding:24px 26px}
.testbox h2{color:#fff;margin-top:0}
.testbox ul{list-style:none;padding:0;margin:14px 0 0;font-family:var(--f-mono);font-size:.88rem}
.testbox li{display:flex;justify-content:space-between;gap:16px;padding:10px 0;border-top:1px dashed var(--deep-line)}
.testbox li span{color:var(--blush);white-space:nowrap}
.testbox a{color:var(--on-deep-link)}
.faq details{background:var(--white);border:1px solid var(--line);border-radius:var(--r);margin:10px 0;padding:0 18px}
.faq summary{cursor:pointer;padding:16px 0;font:600 1.02rem/1.4 var(--f-head);list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font:500 1.2rem/1 var(--f-mono);color:var(--signal)}
.faq details[open] summary::after{content:"−"}
.faq p{color:var(--slate)}
.related{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.related a{display:flex;gap:12px;align-items:center;background:var(--white);border:1px solid var(--line);border-radius:var(--r);padding:14px;text-decoration:none;color:var(--ink);font-weight:500}
.related a:hover{border-color:var(--line-2);color:var(--signal)}
.prose{max-width:72ch}
.prose h2{margin-top:1.4em}
.prose li{margin:.3em 0}
table.cmp{width:100%;border-collapse:collapse;background:var(--white);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;font-size:.93rem}
.cmp th,.cmp td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:top}
.cmp th{font:500 .74rem/1.5 var(--f-mono);letter-spacing:.06em;text-transform:uppercase;color:var(--mute);background:var(--well)}
.tablewrap{overflow-x:auto;-webkit-overflow-scrolling:touch;border-radius:var(--r)}

/* footer */
.foot{background:var(--white);border-top:1px solid var(--line);margin-top:0}
.foot .wrap{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;padding-top:48px;padding-bottom:28px}
.foot h4{font:500 .74rem/1.5 var(--f-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--mute);margin:0 0 12px}
.foot ul{list-style:none;padding:0;margin:0}
.foot li{padding:4px 0}
.foot a{color:var(--ink);text-decoration:none;font-size:.94rem}
.foot a:hover{color:var(--signal)}
.foot .small{grid-column:1/-1;border-top:1px solid var(--line);padding-top:20px;font-size:.85rem;color:var(--mute)}
.foot .small p{margin:0 0 6px}
.foot .small a{color:var(--mute);text-decoration:underline}
.foot .about{color:var(--slate);font-size:.94rem;max-width:36ch}

@media (max-width:980px){
  .nav{display:none}.burger{display:block}
  .hero .wrap,.band .wrap{grid-template-columns:1fr;gap:36px}
  .layout{grid-template-columns:minmax(0,1fr)}.side{position:static;order:-1}
  .picks{grid-template-columns:minmax(0,1fr)}
  .foot .wrap{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  body{font-size:16px}
  .wrap{padding:0 16px}
  .hero .wrap{padding-top:44px;padding-bottom:44px}
  .ghead .wrap{grid-template-columns:1fr}.ghead .gi{display:none}
  .matters,.fit,.related{grid-template-columns:1fr}
  .sec-head{flex-direction:column;align-items:start}
  .spec{grid-template-columns:1fr}.spec dt{padding-bottom:0;border-bottom:0}
  .foot .wrap{grid-template-columns:1fr}
  .product .pb{padding:18px}
}

/* rose-gold hairline under the sticky header */
.top{border-bottom:0;box-shadow:0 1px 0 var(--line)}.top::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;background:var(--rose-gold);opacity:.55}