/* =====================================================
   DESIGN TOKENS  (HubSpot Academy × Salesforce Trailhead)
   Primary: #0033a0 Navy | Accent: Teal #0d9488
   ===================================================== */
:root{
  --navy:#0033a0;
  --navy-deep:#001f5c;
  --navy-darker:#00134a;
  --navy-light:#3b6ee0;
  --navy-soft:#e6edfb;
  --navy-mist:#f2f6fe;

  --teal:#0d9488;
  --teal-deep:#0f766e;
  --teal-light:#14b8a6;
  --teal-soft:#ccfbf1;
  --teal-mist:#f0fdfa;

  --ink:#0b1220;
  --ink-2:#1f2937;
  --slate:#475569;
  --slate-2:#64748b;
  --slate-3:#94a3b8;
  --cloud:#f8fafc;
  --mist:#f1f5f9;
  --line:#e2e8f0;
  --line-2:#cbd5e1;

  --amber:#b45309;
  --amber-bg:#fef3c7;
  --rose:#be123c;
  --rose-bg:#ffe4e6;
  --success:#15803d;
  --success-bg:#dcfce7;

  --shadow-xs:0 1px 2px rgba(15,23,42,.05);
  --shadow-sm:0 1px 3px rgba(15,23,42,.07), 0 1px 2px rgba(15,23,42,.05);
  --shadow:0 4px 14px rgba(15,23,42,.08);
  --shadow-md:0 10px 30px rgba(15,23,42,.10);
  --shadow-lg:0 24px 50px rgba(0,31,92,.16);
  --shadow-navy:0 18px 40px rgba(0,51,160,.18);

  --r-xs:6px;
  --r-sm:10px;
  --r:14px;
  --r-md:18px;
  --r-lg:24px;
  --r-xl:32px;
  --r-pill:999px;

  --ff-display:'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --ff-body:'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;

  --container:1240px;
  --gutter:clamp(20px, 4vw, 40px);
  --toc-w:240px;
}

/* ============ RESET ============ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;scroll-padding-top:90px}
body{
  font-family:var(--ff-body);
  font-size:16px;
  line-height:1.65;
  color:var(--ink-2);
  background:#fff;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
h1,h2,h3,h4,h5{
  font-family:var(--ff-display);
  color:var(--ink);
  font-weight:700;
  line-height:1.18;
  letter-spacing:-.025em;
}
h1{font-size:clamp(2rem,4.4vw,3.15rem);font-weight:800;letter-spacing:-.035em}
h2{font-size:clamp(1.6rem,2.9vw,2.2rem);font-weight:700}
h3{font-size:clamp(1.1rem,1.5vw,1.3rem);font-weight:700}
h4{font-size:1.02rem;font-weight:600}
p{margin:0 0 1em;color:var(--ink-2)}
a{color:var(--navy);text-decoration:none;transition:color .2s}
a:hover{color:var(--navy-deep)}
img,svg{max-width:100%;display:block}
ul,ol{padding-left:1.15rem}
li{margin-bottom:.35rem;color:var(--ink-2)}
strong{color:var(--ink);font-weight:600}
button{font:inherit;cursor:pointer;border:0;background:none}
:focus-visible{outline:3px solid var(--navy-light);outline-offset:3px;border-radius:6px}

/* ============ SKIP LINK / A11Y ============ */
.skip-link{position:absolute;top:-50px;left:8px;background:var(--navy);color:#fff;padding:10px 18px;border-radius:8px;z-index:9999;font-weight:600}
.skip-link:focus{top:8px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}

/* ============ READING PROGRESS BAR ============ */
.progress{position:fixed;top:0;left:0;height:3px;width:0;background:linear-gradient(90deg,var(--navy) 0%,var(--teal) 100%);z-index:200;transition:width .12s ease-out}

/* ============ CONTAINER ============ */
.container{max-width:var(--container);margin:0 auto;padding:0 var(--gutter)}
.container--narrow{max-width:880px}

/* ============ NAV ============ */
.nav{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .3s, background .3s;
}
.nav.is-scrolled{box-shadow:var(--shadow-sm);background:rgba(255,255,255,.96)}
.nav__inner{display:flex;align-items:center;justify-content:space-between;height:66px;gap:20px}
.nav__brand{display:flex;align-items:center;gap:10px;font-family:var(--ff-display);font-weight:800;color:var(--ink);font-size:1.1rem;letter-spacing:-.025em}
.nav__brand-mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--navy) 0%,var(--navy-deep) 100%);display:grid;place-items:center;color:#fff;font-size:.78rem;font-weight:800;letter-spacing:.04em;box-shadow:0 4px 10px rgba(0,31,92,.25)}
.nav__menu{display:flex;align-items:center;gap:4px}
.nav__item{position:relative}
.nav__link{display:inline-flex;align-items:center;gap:6px;padding:9px 13px;border-radius:8px;font-weight:500;font-size:.92rem;color:var(--ink-2);transition:background .2s,color .2s}
.nav__link:hover{background:var(--mist);color:var(--navy)}
.nav__link[aria-current="page"]{color:var(--navy);background:var(--navy-mist)}
.nav__submenu{position:absolute;top:calc(100% + 6px);left:0;min-width:230px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow-md);padding:6px;opacity:0;visibility:hidden;transform:translateY(-6px);transition:opacity .2s,transform .2s,visibility .2s}
.nav__item:hover>.nav__submenu,.nav__item:focus-within>.nav__submenu{opacity:1;visibility:visible;transform:translateY(0)}
.nav__submenu a{display:block;padding:8px 12px;border-radius:8px;font-size:.88rem;color:var(--ink-2)}
.nav__submenu a:hover{background:var(--mist);color:var(--navy)}
.nav__actions{display:flex;align-items:center;gap:8px}
.nav__toggle{display:none;padding:8px;color:var(--ink)}
.nav__toggle svg{width:24px;height:24px}

/* ============ BUTTONS ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--ff-display);font-weight:600;font-size:.94rem;
  padding:12px 22px;border-radius:var(--r-pill);
  border:1.5px solid transparent;
  transition:transform .15s, box-shadow .2s, background .2s, color .2s, border-color .2s;
  text-align:center;white-space:nowrap;line-height:1;
}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn--primary{background:var(--navy);color:#fff;box-shadow:0 6px 16px rgba(0,51,160,.22)}
.btn--primary:hover{background:var(--navy-deep);color:#fff;box-shadow:0 10px 22px rgba(0,51,160,.3)}
.btn--accent{background:var(--teal);color:#fff;box-shadow:0 6px 16px rgba(13,148,136,.25)}
.btn--accent:hover{background:var(--teal-deep);color:#fff;box-shadow:0 10px 22px rgba(13,148,136,.32)}
.btn--ghost{background:#fff;color:var(--navy);border-color:var(--line-2)}
.btn--ghost:hover{background:var(--mist);color:var(--navy-deep);border-color:var(--navy-light)}
.btn--light{background:rgba(255,255,255,.16);color:#fff;border-color:rgba(255,255,255,.35);backdrop-filter:blur(8px)}
.btn--light:hover{background:rgba(255,255,255,.26);color:#fff}
.btn--sm{padding:9px 16px;font-size:.86rem}
.btn--lg{padding:15px 28px;font-size:1rem}
.btn--block{display:flex;width:100%}
.btn [data-lucide]{width:16px;height:16px}

/* ============ BREADCRUMBS ============ */
.crumbs{font-size:.86rem;color:var(--slate-2);padding:14px 0 0}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;padding:0;margin:0;align-items:center}
.crumbs li{display:inline-flex;align-items:center;gap:6px;margin:0}
.crumbs a{color:var(--slate-2);font-weight:500}
.crumbs a:hover{color:var(--navy)}
.crumbs li[aria-current="page"]{color:var(--ink);font-weight:600}
.crumbs li:not(:last-child)::after{content:"/";color:var(--slate-3);margin-left:6px}

/* ============ HERO ============ */
.hero{position:relative;background:linear-gradient(180deg,var(--navy-mist) 0%,#fff 100%);padding:34px 0 56px;overflow:hidden}
.hero::before{content:"";position:absolute;top:-200px;right:-200px;width:600px;height:600px;background:radial-gradient(circle, rgba(13,148,136,.10) 0%, transparent 60%);pointer-events:none}
.hero::after{content:"";position:absolute;bottom:-150px;left:-150px;width:450px;height:450px;background:radial-gradient(circle, rgba(0,51,160,.10) 0%, transparent 60%);pointer-events:none}
.hero__inner{position:relative;display:grid;grid-template-columns:1.4fr .9fr;gap:48px;align-items:center}
.hero__meta{display:inline-flex;align-items:center;gap:10px;background:#fff;border:1px solid var(--line);padding:6px 14px 6px 6px;border-radius:var(--r-pill);font-size:.82rem;font-weight:500;color:var(--slate);box-shadow:var(--shadow-xs);margin-bottom:22px}
.hero__meta-badge{background:var(--teal);color:#fff;font-family:var(--ff-display);font-weight:700;font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;padding:4px 10px;border-radius:var(--r-pill)}
.hero__title{margin-bottom:18px}
.hero__title .hl{color:var(--navy);position:relative;display:inline-block}
.hero__title .hl::after{content:"";position:absolute;left:-2px;right:-2px;bottom:6px;height:10px;background:var(--teal-soft);z-index:-1;border-radius:4px}
.hero__lead{font-size:1.1rem;color:var(--slate);max-width:580px;margin-bottom:26px}
.hero__cta{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:26px}
.hero__reading{display:flex;flex-wrap:wrap;gap:18px;font-size:.85rem;color:var(--slate-2)}
.hero__reading span{display:inline-flex;align-items:center;gap:6px}
.hero__reading [data-lucide]{width:15px;height:15px;color:var(--teal)}

/* hero bento stat board */
.hero__board{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.bento{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);padding:18px;box-shadow:var(--shadow-sm);position:relative;overflow:hidden;transition:transform .25s,box-shadow .25s}
.bento:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.bento--accent{background:linear-gradient(140deg,var(--navy) 0%,var(--navy-deep) 100%);color:#fff;border-color:transparent}
.bento--accent .bento__num,.bento--accent .bento__label{color:#fff}
.bento--accent .bento__label{opacity:.85}
.bento--teal{background:linear-gradient(140deg,var(--teal) 0%,var(--teal-deep) 100%);color:#fff;border-color:transparent}
.bento--teal .bento__num,.bento--teal .bento__label{color:#fff}
.bento--teal .bento__label{opacity:.9}
.bento__top{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:10px}
.bento__icon{width:32px;height:32px;border-radius:9px;display:grid;place-items:center;background:var(--navy-mist);color:var(--navy)}
.bento--accent .bento__icon,.bento--teal .bento__icon{background:rgba(255,255,255,.18);color:#fff}
.bento__icon [data-lucide]{width:18px;height:18px}
.bento__tag{font-size:.68rem;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:var(--teal);background:var(--teal-soft);padding:3px 8px;border-radius:var(--r-pill)}
.bento--accent .bento__tag{background:rgba(255,255,255,.18);color:#fff}
.bento--teal .bento__tag{background:rgba(255,255,255,.2);color:#fff}
.bento__num{font-family:var(--ff-display);font-weight:800;font-size:1.95rem;color:var(--ink);line-height:1;letter-spacing:-.03em}
.bento__label{font-size:.82rem;color:var(--slate);margin-top:6px;font-weight:500}

/* ============ ARTICLE LAYOUT (sidebar + main) ============ */
.article{display:grid;grid-template-columns:var(--toc-w) minmax(0,1fr);gap:48px;padding:56px 0 32px;align-items:start}
.toc{position:sticky;top:90px;background:#fff;border:1px solid var(--line);border-radius:var(--r-md);padding:18px 16px;box-shadow:var(--shadow-xs)}
.toc__label{font-family:var(--ff-display);font-size:.72rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--slate-2);margin-bottom:14px;display:flex;align-items:center;gap:8px}
.toc__label [data-lucide]{width:14px;height:14px;color:var(--teal)}
.toc__list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:2px}
.toc__list a{display:block;padding:8px 10px;border-radius:8px;font-size:.85rem;color:var(--slate);font-weight:500;border-left:2px solid transparent;line-height:1.4;transition:all .2s}
.toc__list a:hover{background:var(--mist);color:var(--navy)}
.toc__list a.is-active{color:var(--navy);background:var(--navy-mist);border-left-color:var(--navy);font-weight:600}
.toc__num{display:inline-block;width:20px;height:20px;line-height:20px;text-align:center;background:var(--mist);color:var(--slate);border-radius:50%;font-size:.7rem;font-weight:700;margin-right:8px;font-family:var(--ff-display)}
.toc__list a.is-active .toc__num{background:var(--navy);color:#fff}
.toc__foot{margin-top:16px;padding-top:16px;border-top:1px dashed var(--line);font-size:.78rem;color:var(--slate-2)}
.toc__foot strong{display:block;color:var(--ink);font-size:.84rem;margin-bottom:4px}

/* main content area */
.main{min-width:0}
.section{padding:48px 0;border-top:1px solid var(--line)}
.section:first-child{border-top:0;padding-top:0}
.section__head{margin-bottom:32px;max-width:720px}
.section__eyebrow{display:inline-flex;align-items:center;gap:7px;font-family:var(--ff-display);font-size:.74rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--teal);background:var(--teal-soft);padding:5px 12px;border-radius:var(--r-pill);margin-bottom:14px}
.section__eyebrow [data-lucide]{width:13px;height:13px}
.section__title{margin-bottom:12px}
.section__sub{color:var(--slate);font-size:1.04rem;max-width:680px}

/* ============ TL;DR CARD ============ */
.tldr{background:linear-gradient(135deg,var(--navy-mist) 0%,var(--teal-mist) 100%);border:1px solid var(--navy-soft);border-radius:var(--r-md);padding:28px 30px;position:relative;overflow:hidden}
.tldr::before{content:"";position:absolute;top:-30px;right:-30px;width:160px;height:160px;background:radial-gradient(circle,rgba(13,148,136,.18) 0%,transparent 60%);pointer-events:none}
.tldr__head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.tldr__icon{width:42px;height:42px;border-radius:11px;background:var(--navy);color:#fff;display:grid;place-items:center;flex-shrink:0;box-shadow:var(--shadow-navy)}
.tldr__icon [data-lucide]{width:22px;height:22px}
.tldr__label{font-family:var(--ff-display);font-size:.74rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--teal-deep)}
.tldr__title{font-family:var(--ff-display);font-size:1.15rem;font-weight:700;color:var(--ink);letter-spacing:-.02em}
.tldr__body{font-size:1.06rem;color:var(--ink-2);line-height:1.7;position:relative}
.tldr__body strong{color:var(--navy);background:linear-gradient(180deg,transparent 60%,var(--teal-soft) 60%);padding:0 2px}

/* ============ MATERIAL FINDER (interactive) ============ */
.finder{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:8px;box-shadow:var(--shadow-md)}
.finder__head{background:linear-gradient(135deg,var(--navy) 0%,var(--navy-deep) 100%);color:#fff;padding:22px 26px;border-radius:18px;display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
.finder__head-title{font-family:var(--ff-display);font-weight:700;font-size:1.1rem;color:#fff;display:flex;align-items:center;gap:10px}
.finder__head-title [data-lucide]{width:20px;height:20px;color:var(--teal-light)}
.finder__head-step{font-size:.82rem;color:rgba(255,255,255,.8);font-weight:500}
.finder__body{padding:24px 22px}
.finder__q{margin-bottom:22px}
.finder__q:last-child{margin-bottom:0}
.finder__qlabel{font-family:var(--ff-display);font-weight:600;font-size:.96rem;color:var(--ink);margin-bottom:10px;display:flex;align-items:center;gap:8px}
.finder__qnum{display:inline-grid;place-items:center;width:24px;height:24px;background:var(--teal);color:#fff;border-radius:7px;font-size:.78rem;font-weight:700}
.finder__chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{display:inline-flex;align-items:center;gap:7px;padding:9px 14px;background:var(--cloud);border:1.5px solid var(--line);border-radius:var(--r-pill);font-size:.86rem;font-weight:500;color:var(--slate);cursor:pointer;transition:all .18s;font-family:var(--ff-body)}
.chip:hover{border-color:var(--navy-light);color:var(--navy);background:#fff}
.chip[aria-pressed="true"]{background:var(--navy);color:#fff;border-color:var(--navy);box-shadow:0 4px 10px rgba(0,51,160,.2)}
.chip [data-lucide]{width:14px;height:14px}
.finder__result{margin-top:24px;background:var(--teal-mist);border:1.5px dashed var(--teal);border-radius:var(--r);padding:20px;display:none}
.finder__result.is-show{display:block;animation:fadeUp .35s ease both}
@keyframes fadeUp{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.finder__result-label{font-family:var(--ff-display);font-size:.74rem;font-weight:700;text-transform:uppercase;letter-spacing:.12em;color:var(--teal-deep);margin-bottom:6px;display:flex;align-items:center;gap:7px}
.finder__result-label [data-lucide]{width:14px;height:14px}
.finder__result-title{font-family:var(--ff-display);font-size:1.3rem;font-weight:700;color:var(--ink);margin-bottom:6px}
.finder__result-why{font-size:.92rem;color:var(--slate)}
.finder__reset{margin-top:12px;font-size:.82rem;color:var(--navy);background:none;text-decoration:underline;font-weight:500}

/* ============ QUICK TABLE (modernized) ============ */
.table-wrap{overflow-x:auto;border-radius:var(--r);border:1px solid var(--line);box-shadow:var(--shadow-xs)}
.la-table{width:100%;border-collapse:collapse;background:#fff;min-width:580px}
.la-table thead{background:linear-gradient(135deg,var(--navy) 0%,var(--navy-deep) 100%)}
.la-table th{color:#fff;font-family:var(--ff-display);font-weight:600;text-align:left;padding:15px 18px;font-size:.86rem;letter-spacing:.03em}
.la-table tbody td{padding:14px 18px;border-bottom:1px solid var(--line);font-size:.94rem;vertical-align:top}
.la-table tbody tr:last-child td{border-bottom:0}
.la-table tbody tr:nth-child(even){background:var(--cloud)}
.la-table tbody tr:hover{background:var(--navy-mist)}
.la-table .col-accent{font-family:var(--ff-display);font-weight:600;color:var(--navy)}
.la-table .pill{display:inline-flex;align-items:center;gap:5px;background:var(--teal-soft);color:var(--teal-deep);font-size:.78rem;font-weight:600;padding:3px 9px;border-radius:var(--r-pill);white-space:nowrap}
.la-table .pill [data-lucide]{width:12px;height:12px}

/* ============ MATERIAL LIBRARY CARDS ============ */
.mat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(285px,1fr));gap:18px}
.mat{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);padding:22px;transition:transform .25s,box-shadow .25s,border-color .25s;display:flex;flex-direction:column;position:relative;overflow:hidden}
.mat:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:var(--navy-soft)}
.mat::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--teal);opacity:0;transition:opacity .25s}
.mat:hover::before{opacity:1}
.mat--paper::before{background:linear-gradient(180deg,#c9a961,#a8884a)}
.mat--film::before{background:linear-gradient(180deg,var(--navy),var(--navy-light))}
.mat--clear::before{background:linear-gradient(180deg,var(--teal),var(--teal-light))}
.mat--natural::before{background:linear-gradient(180deg,#92400e,#b45309)}
.mat--lux::before{background:linear-gradient(180deg,#7c2d12,#9a3412)}
.mat--pro::before{background:linear-gradient(180deg,var(--navy-deep),var(--navy))}
.mat__head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:12px}
.mat__icon{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;background:var(--navy-mist);color:var(--navy);flex-shrink:0}
.mat--paper .mat__icon{background:#fdf6e3;color:#a8884a}
.mat--film .mat__icon{background:var(--navy-mist);color:var(--navy)}
.mat--clear .mat__icon{background:var(--teal-mist);color:var(--teal-deep)}
.mat--natural .mat__icon{background:#fef3c7;color:#b45309}
.mat--lux .mat__icon{background:#fed7aa;color:#9a3412}
.mat--pro .mat__icon{background:var(--navy-soft);color:var(--navy-deep)}
.mat__icon [data-lucide]{width:22px;height:22px}
.mat__tag{font-family:var(--ff-display);font-size:.66rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--slate-2);background:var(--mist);padding:4px 9px;border-radius:var(--r-pill)}
.mat__name{font-family:var(--ff-display);font-size:1.18rem;font-weight:700;color:var(--ink);margin-bottom:6px;letter-spacing:-.02em}
.mat__desc{font-size:.92rem;color:var(--slate);margin-bottom:14px;flex-grow:1}
.mat__props{display:flex;flex-direction:column;gap:9px;margin-bottom:14px;padding-top:14px;border-top:1px dashed var(--line)}
.prop{display:grid;grid-template-columns:88px 1fr 36px;align-items:center;gap:10px;font-size:.78rem}
.prop__label{color:var(--slate-2);font-weight:500}
.prop__bar{height:6px;background:var(--mist);border-radius:3px;overflow:hidden}
.prop__fill{display:block;height:100%;background:linear-gradient(90deg,var(--navy) 0%,var(--teal) 100%);border-radius:3px;transform-origin:left;transform:scaleX(0);transition:transform 1s cubic-bezier(.2,.8,.2,1)}
.prop__fill.is-low{background:linear-gradient(90deg,var(--slate-3) 0%,var(--slate-2) 100%)}
.prop__val{font-family:var(--ff-display);font-weight:700;color:var(--ink);text-align:right;font-size:.74rem}
.mat__tags{display:flex;flex-wrap:wrap;gap:6px}
.tag{display:inline-flex;align-items:center;gap:5px;background:var(--cloud);color:var(--slate);border:1px solid var(--line);font-size:.74rem;font-weight:500;padding:4px 10px;border-radius:var(--r-pill)}
.tag [data-lucide]{width:11px;height:11px;color:var(--teal)}

/* ============ SURFACE & ENVIRONMENT GRID ============ */
.dual-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px}
.tile{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:20px;display:flex;gap:14px;align-items:flex-start;transition:transform .2s,box-shadow .2s,border-color .2s;position:relative}
.tile:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--teal)}
.tile__icon{width:42px;height:42px;border-radius:11px;display:grid;place-items:center;flex-shrink:0;background:var(--teal-mist);color:var(--teal-deep)}
.tile__icon [data-lucide]{width:22px;height:22px}
.tile__title{font-family:var(--ff-display);font-weight:700;font-size:1rem;color:var(--ink);margin-bottom:4px}
.tile__desc{font-size:.88rem;color:var(--slate);line-height:1.55}
.tile__num{position:absolute;top:12px;right:14px;font-family:var(--ff-display);font-weight:800;color:var(--mist);font-size:1.4rem;line-height:1}

/* environment variant: amber palette */
.tile--env .tile__icon{background:#fef3c7;color:#b45309}
.tile--env:hover{border-color:#b45309}
.tile--env .tile__num{color:#fef3c7}

/* ============ FOIL × MATERIAL PAIRINGS ============ */
.pair-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px}
.pair{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);padding:0;overflow:hidden;transition:transform .25s,box-shadow .25s}
.pair:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.pair__swatch{height:120px;position:relative;overflow:hidden;display:flex;align-items:flex-end;padding:16px}
.pair__swatch::after{content:"";position:absolute;inset:0;background-image:linear-gradient(135deg,rgba(255,255,255,.18) 0%,transparent 50%,rgba(0,0,0,.08) 100%);pointer-events:none}
.pair__foil{position:absolute;top:14px;right:14px;font-family:var(--ff-display);font-weight:700;font-size:.72rem;text-transform:uppercase;letter-spacing:.1em;background:rgba(255,255,255,.92);padding:5px 11px;border-radius:var(--r-pill);box-shadow:var(--shadow-sm);color:var(--ink)}
.pair__mat{position:relative;z-index:1;font-family:var(--ff-display);font-weight:700;color:#fff;font-size:1.05rem;text-shadow:0 2px 6px rgba(0,0,0,.4)}
.pair__body{padding:18px 20px}
.pair__title{font-family:var(--ff-display);font-weight:700;color:var(--ink);font-size:1.08rem;margin-bottom:6px}
.pair__desc{font-size:.9rem;color:var(--slate);line-height:1.55}
.pair__moods{margin-top:12px;display:flex;flex-wrap:wrap;gap:6px}
.mood{font-size:.72rem;font-weight:600;background:var(--navy-mist);color:var(--navy);padding:3px 9px;border-radius:var(--r-pill)}

/* swatch backgrounds */
.sw--gold-black{background:linear-gradient(135deg,#1a1a1a 0%,#2d2d2d 100%)}
.sw--gold-kraft{background:linear-gradient(135deg,#a87b4a 0%,#7c5530 100%)}
.sw--rosegold-white{background:linear-gradient(135deg,#f9e3d8 0%,#e8c5b3 100%)}
.sw--silver-clear{background:linear-gradient(135deg,#d8dee8 0%,#9aa6b8 100%)}
.sw--copper-cream{background:linear-gradient(135deg,#e8d9bc 0%,#c8855a 100%)}
.sw--holo-vinyl{background:linear-gradient(135deg,#b76bff 0%,#6bb6ff 25%,#6bffbb 50%,#ffb56b 75%,#b76bff 100%)}

/* ============ MISTAKES (severity) ============ */
.mis-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(310px,1fr));gap:16px}
.mis{background:#fff;border:1px solid var(--line);border-left:4px solid var(--amber);border-radius:var(--r);padding:20px 22px;transition:transform .2s,box-shadow .2s}
.mis:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.mis--severe{border-left-color:var(--rose)}
.mis__head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px}
.mis__icon{width:38px;height:38px;border-radius:10px;background:var(--amber-bg);color:var(--amber);display:grid;place-items:center;flex-shrink:0}
.mis--severe .mis__icon{background:var(--rose-bg);color:var(--rose)}
.mis__icon [data-lucide]{width:20px;height:20px}
.mis__sev{font-family:var(--ff-display);font-size:.68rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;padding:4px 9px;border-radius:var(--r-pill);background:var(--amber-bg);color:var(--amber)}
.mis--severe .mis__sev{background:var(--rose-bg);color:var(--rose)}
.mis__title{font-family:var(--ff-display);font-weight:700;color:var(--ink);font-size:1.04rem;margin-bottom:8px;line-height:1.3}
.mis__body{font-size:.9rem;color:var(--slate);line-height:1.55}
.mis__fix{margin-top:12px;font-size:.84rem;background:var(--success-bg);color:var(--success);padding:9px 12px;border-radius:8px;display:flex;gap:8px;align-items:flex-start;font-weight:500}
.mis__fix [data-lucide]{width:14px;height:14px;flex-shrink:0;margin-top:2px}

/* ============ PRODUCT LINKS ============ */
.prod-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px}
.prod{display:block;background:linear-gradient(140deg,var(--navy) 0%,var(--navy-deep) 100%);color:#fff;border-radius:var(--r);padding:22px;position:relative;overflow:hidden;transition:transform .25s,box-shadow .25s}
.prod:hover{transform:translateY(-4px);box-shadow:var(--shadow-navy);color:#fff}
.prod::after{content:"";position:absolute;top:-40px;right:-40px;width:140px;height:140px;background:radial-gradient(circle,rgba(13,148,136,.4) 0%,transparent 60%);pointer-events:none}
.prod__icon{width:40px;height:40px;border-radius:10px;background:rgba(255,255,255,.14);display:grid;place-items:center;color:#fff;margin-bottom:14px;position:relative;z-index:1}
.prod__icon [data-lucide]{width:22px;height:22px}
.prod__title{font-family:var(--ff-display);font-weight:700;font-size:1.1rem;margin-bottom:6px;display:flex;align-items:center;justify-content:space-between;position:relative;z-index:1}
.prod__title [data-lucide]{width:18px;height:18px;color:var(--teal-light);transition:transform .25s}
.prod:hover .prod__title [data-lucide]{transform:translateX(4px)}
.prod__desc{font-size:.86rem;color:rgba(255,255,255,.78);position:relative;z-index:1;line-height:1.5}

/* ============ FAQ ============ */
.faq{display:flex;flex-direction:column;gap:10px}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;transition:box-shadow .2s,border-color .2s}
.faq-item:hover{border-color:var(--navy-soft)}
.faq-item[open]{box-shadow:var(--shadow-sm);border-color:var(--navy-soft)}
.faq-item summary{list-style:none;cursor:pointer;padding:18px 22px;font-family:var(--ff-display);font-weight:600;color:var(--ink);font-size:1rem;display:flex;align-items:center;justify-content:space-between;gap:14px;line-height:1.4}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:1.4rem;font-weight:600;color:var(--navy);transition:transform .25s;background:var(--navy-mist);width:30px;height:30px;border-radius:50%;display:grid;place-items:center;flex-shrink:0;line-height:1}
.faq-item[open] summary::after{content:"\2013";background:var(--teal);color:#fff;transform:rotate(180deg)}
.faq-item[open] summary{color:var(--navy)}
.faq-item__body{padding:0 22px 20px;font-size:.94rem;color:var(--slate);line-height:1.65}
.faq-item__body p{margin-bottom:.6em}
.faq-item__body p:last-child{margin-bottom:0}

/* ============ CTA BAND ============ */
.cta-band{background:linear-gradient(135deg,var(--navy-deep) 0%,var(--navy) 50%,var(--teal-deep) 130%);color:#fff;border-radius:var(--r-xl);padding:48px clamp(28px,5vw,64px);position:relative;overflow:hidden;text-align:center}
.cta-band::before{content:"";position:absolute;top:-100px;right:-100px;width:400px;height:400px;background:radial-gradient(circle,rgba(13,148,136,.35) 0%,transparent 65%);pointer-events:none}
.cta-band::after{content:"";position:absolute;bottom:-100px;left:-100px;width:340px;height:340px;background:radial-gradient(circle,rgba(255,255,255,.06) 0%,transparent 65%);pointer-events:none}
.cta-band__title{font-family:var(--ff-display);font-weight:800;color:#fff;font-size:clamp(1.6rem,3vw,2.2rem);margin-bottom:14px;position:relative;letter-spacing:-.025em}
.cta-band__sub{font-size:1.05rem;color:rgba(255,255,255,.85);max-width:680px;margin:0 auto 26px;position:relative;line-height:1.6}
.cta-band__actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;position:relative}

/* ============ FOOTER ============ */
.footer{background:var(--navy-darker);color:rgba(255,255,255,.78);padding:56px 0 28px;margin-top:64px}
.footer__grid{display:grid;grid-template-columns:1.5fr repeat(4,1fr);gap:36px;margin-bottom:40px}
.footer__brand{display:flex;align-items:center;gap:10px;margin-bottom:14px;color:#fff;font-family:var(--ff-display);font-weight:800;font-size:1.15rem;letter-spacing:-.025em}
.footer__desc{font-size:.88rem;line-height:1.6;color:rgba(255,255,255,.65);margin-bottom:14px}
.footer__loc{font-size:.82rem;color:rgba(255,255,255,.5)}
.footer__col h4{color:#fff;font-family:var(--ff-display);font-weight:700;font-size:.95rem;margin-bottom:14px;letter-spacing:-.01em}
.footer__col ul{list-style:none;padding:0;margin:0}
.footer__col li{margin-bottom:9px}
.footer__col a{color:rgba(255,255,255,.7);font-size:.88rem;transition:color .2s}
.footer__col a:hover{color:#fff}
.footer__bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:.82rem;color:rgba(255,255,255,.55)}

/* ============ FLOATING ACTIONS ============ */
.fab{position:fixed;bottom:24px;left:4px;display:flex;flex-direction:column;gap:10px;z-index:90}
.fab__btn{width:46px;height:46px;border-radius:50%;background:var(--navy);color:#fff;display:grid;place-items:center;box-shadow:var(--shadow-md);transition:transform .2s,background .2s,opacity .25s,visibility .25s;opacity:0;visibility:hidden}
.fab__btn.is-show{opacity:1;visibility:visible}
.fab__btn:hover{transform:translateY(-3px);background:var(--navy-deep);color:#fff}
.fab__btn [data-lucide]{width:20px;height:20px}
.fab__samples{background:var(--teal);padding:0 18px;width:155px;height:46px;border-radius:var(--r-pill);font-family:var(--ff-display);font-weight:600;font-size:.86rem;gap:8px;display:inline-flex;align-items:center}
.fab__samples:hover{background:var(--teal-deep);color:#fff}
.fab__samples [data-lucide]{width:16px;height:16px}

/* ============ SECTION DIVIDER FLAG ============ */
.section-flag{display:flex;align-items:center;gap:14px;margin-bottom:18px}
.section-flag__num{font-family:var(--ff-display);font-weight:800;font-size:.78rem;color:#fff;background:linear-gradient(135deg,var(--navy) 0%,var(--teal) 100%);padding:6px 12px;border-radius:var(--r-pill);letter-spacing:.08em}
.section-flag__line{flex-grow:1;height:1px;background:linear-gradient(90deg,var(--line) 0%,transparent 100%)}

/* ============ ANIMATIONS ============ */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.01ms !important;transition-duration:.01ms !important;scroll-behavior:auto !important}
}

/* ============ RESPONSIVE ============ */
@media (max-width: 1080px){
  .hero__inner{grid-template-columns:1fr;gap:32px}
  .hero__board{order:2}
  .article{grid-template-columns:1fr;gap:0}
  .toc{position:relative;top:0;display:none}
}
@media (max-width: 860px){
  .nav__menu{display:none;position:absolute;top:66px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:14px;gap:4px;box-shadow:var(--shadow-md)}
  .nav__menu.is-open{display:flex}
  .nav__item{width:100%}
  .nav__link{padding:12px 14px}
  .nav__submenu{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:0;padding:4px 0 4px 14px;background:transparent;min-width:0}
  .nav__submenu a{padding:9px 12px;font-size:.86rem}
  .nav__toggle{display:block}
  .nav__actions .btn--ghost{display:none}
  .footer__grid{grid-template-columns:1fr 1fr;gap:28px}
  .cta-band{padding:36px 24px}
}
@media (max-width: 560px){
  :root{--gutter:16px}
  html{scroll-padding-top:76px}
  .hero{padding:22px 0 40px}
  .hero__lead{font-size:1rem}
  .hero__board{grid-template-columns:1fr 1fr;gap:10px}
  .bento{padding:14px}
  .bento__num{font-size:1.5rem}
  .section{padding:36px 0}
  .section__head{margin-bottom:22px}
  .tldr{padding:20px}
  .finder__head{padding:18px 18px}
  .finder__body{padding:18px 14px}
  .prop{grid-template-columns:78px 1fr 32px;font-size:.74rem}
  .footer__grid{grid-template-columns:1fr 1fr}
  .footer__brand-col{grid-column:1/-1}
  .fab{bottom:16px;right:16px}
}