/* ============================================================
   Sean Lawrence — Portfolio Design System
   Type: IBM Plex Serif (display) / IBM Plex Sans (body) / IBM Plex Mono (data)
   Palette: paper + ink + teal (verification) + brass (credential)
   Signature: node-and-connector schematic motif, echoed in the
   case-study diagrams — the site's visual language IS the work.
   ============================================================ */

:root{
  --paper: #F5F6F8;
  --surface: #FFFFFF;
  --ink: #101826;
  --ink-soft: #1C2636;
  --slate: #485366;
  --slate-light: #4D525C;
  --line: #DEE3E9;
  --line-soft: #EBEEF2;
  --teal: #115D4F;
  --teal-deep: #0E4E43;
  --teal-tint: #E3F0EC;
  --brass: #64461C;
  --brass-tint: #F3E9D8;
  --radius: 3px;
  --maxw: 1120px;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 6.5rem;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

body{
  margin:0;
  background: var(--paper);
  color: var(--slate);
  font-family: "IBM Plex Sans", -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1,h2,h3,h4{
  font-family: "IBM Plex Serif", Georgia, serif;
  color: var(--ink);
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.mono{ font-family: "IBM Plex Mono", monospace; }

a{ color: inherit; text-decoration:none; }

img,svg{ max-width:100%; display:block; }

.wrap{
  max-width: none;
  margin: 0;
  padding: 0 clamp(1.25rem, 4vw, 3.5rem);
}

/* ---------- Focus & motion baseline ---------- */
a:focus-visible, button:focus-visible{
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}
@media (prefers-reduced-motion: reduce){
  *{ animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; scroll-behavior:auto !important; }
}

/* ---------- Header / Nav ---------- */
.site-header{
  position: sticky; top:0; z-index: 50;
  background: rgba(245,246,248,0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  padding: .9rem clamp(1.25rem, 4vw, 3.5rem);
  position: relative;
}
.nav-role, .nav-pitch, .nav-profile{ display:none; }
.logo{
  font-family:"IBM Plex Mono", monospace;
  font-weight: 600;
  font-size: 1rem;
  color: var(--ink);
  letter-spacing: 0.02em;
  display:flex; align-items:center; gap:.5rem;
}
.logo .dot{ color: var(--teal); }
.nav-links{
  display:flex; gap: 2rem; align-items:center;
  font-size: 0.92rem;
  font-family:"IBM Plex Mono", monospace;
}
.nav-links a{ color: var(--slate); transition: color .15s; }
.nav-links a:hover{ color: var(--teal); }

/* "Case Studies" dropdown — nested <details>, no JS. */
.nav-sub{ position:relative; }
.nav-sub > summary{
  list-style:none; cursor:pointer; color: var(--slate); transition: color .15s;
}
.nav-sub > summary::-webkit-details-marker{ display:none; }
.nav-sub > summary::after{ content:" \25BE"; font-size:.8em; }
.nav-sub > summary:hover,
.nav-sub[open] > summary{ color: var(--teal); }
.nav-sub-menu{
  position:absolute; top: calc(100% + 1.1rem); left:-1rem;
  display:flex; flex-direction:column; gap:.85rem;
  background: var(--surface); border:1px solid var(--line); border-radius: var(--radius);
  padding: 1.1rem 1.25rem; min-width: 250px;
  box-shadow: 0 8px 24px -8px rgba(16,24,38,0.25);
  z-index: 60;
}

/* Mobile nav toggle — <details>/<summary> gets keyboard support and
   aria-expanded state announced to screen readers natively, no JS needed.
   Hidden entirely above the 900px breakpoint, where .nav-links just
   renders inline as normal. */
.nav-toggle-btn{
  display:none;
  align-items:center; justify-content:center;
  width:2.75rem; height:2.75rem;
  border:1px solid var(--line); border-radius: var(--radius);
  cursor:pointer; list-style:none;
}
.nav-toggle-btn::-webkit-details-marker{ display:none; }
.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after{
  display:block; width:18px; height:2px; background: var(--ink);
  transition: background .15s, transform .15s, top .15s;
}
.nav-toggle-icon{ position:relative; }
.nav-toggle-icon::before,
.nav-toggle-icon::after{ content:""; position:absolute; left:0; }
.nav-toggle-icon::before{ top:-6px; }
.nav-toggle-icon::after{ top:6px; }
/* Newer Chromium hides a closed <details>' content via ::details-content,
   which would hide the desktop nav links — force them visible above 900px. */
@media (min-width: 901px){
  .nav-toggle::details-content{ display:contents; content-visibility:visible; }
}
.nav-toggle[open] .nav-toggle-icon{ background:transparent; }
.nav-toggle[open] .nav-toggle-icon::before{ top:0; transform:rotate(45deg); }
.nav-toggle[open] .nav-toggle-icon::after{ top:0; transform:rotate(-45deg); }

.btn{
  display:inline-flex; align-items:center; gap:.5rem;
  background: var(--ink);
  color: var(--paper) !important;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius);
  font-family:"IBM Plex Mono", monospace;
  font-size: .9rem;
  font-weight:500;
  border:1px solid var(--ink);
  transition: background .15s, transform .15s;
  cursor:pointer;
}
.btn:hover{ background: var(--teal); border-color: var(--teal); }
.btn-outline{
  background: transparent;
  color: var(--ink) !important;
  border: 1px solid var(--line);
}
.btn-outline:hover{ border-color: var(--teal); color: var(--teal) !important; background:transparent; }

/* ---------- Section scaffolding ---------- */
section{ padding: var(--space-6) 0; border-bottom: 1px solid var(--line-soft); }
section:last-of-type{ border-bottom:none; }

.eyebrow{
  font-family:"IBM Plex Mono", monospace;
  font-size: .9rem;
  letter-spacing: 0.08em;
  color: var(--teal);
  text-transform: uppercase;
  display:flex; align-items:center; gap:.6rem;
  margin-bottom: var(--space-2);
}
.eyebrow::before{
  content:"";
  width: 22px; height:1px; background: var(--teal);
}
.section-head{ max-width: 640px; margin-bottom: var(--space-4); }
.section-head h2{ font-size: clamp(1.6rem, 3vw, 2.2rem); }
.section-head h2 em{ font-style: normal; color: var(--teal); }
.section-head p{ margin-top: .85rem; color: var(--slate-light); font-size: 1.02rem; }

/* ---------- Hero ---------- */
.hero{
  padding: var(--space-6) 0 var(--space-5);
  border-bottom: 1px solid var(--line-soft);
}
.hero-grid{
  display:grid; grid-template-columns: 1.15fr 0.85fr; gap: var(--space-5);
  align-items:center;
}
.hero h1{
  font-size: clamp(2.1rem, 4.4vw, 3.4rem);
  line-height: 1.12;
}
.hero h1 em{
  font-style: normal; color: var(--teal);
}
.hero-sub{
  margin-top: var(--space-3);
  font-size: 1.12rem;
  color: var(--slate);
  max-width: 46ch;
}
.hero-cta{ display:flex; flex-wrap:wrap; gap: 1rem; margin-top: var(--space-4); }
.hero-tags{
  display:flex; flex-wrap:wrap; gap:.5rem; margin-top: var(--space-4);
}
.tag{
  font-family:"IBM Plex Mono", monospace;
  font-size: .9rem;
  padding: .35rem .7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--slate);
  background: var(--surface);
}

/* ---------- Hero portrait ---------- */
/* Source image (sean-portrait.png) is already a circle — transparent alpha
   mask baked into the PNG itself — so no border-radius/crop/ring treatment
   is added here. Scales exactly like .node-diagram below it: width:100%
   plus height:auto lets the browser preserve the image's own intrinsic
   aspect ratio (read from the width/height attributes) at any size. */
.hero-portrait-wrap{
  width: 100%;
  margin-bottom: var(--space-3);
}
.hero-portrait{
  width: 100%;
  height: auto;
  display: block;
}

/* ---------- Node diagram (signature element) ---------- */
.node-diagram{ width:100%; height:auto; }
.node-diagram .node-line{ stroke: var(--line); stroke-width: 1.4; }
.node-diagram .node-line-active{ stroke: var(--teal); stroke-width: 1.6; }
.node-diagram .node-dot{ fill: var(--surface); stroke: var(--ink); stroke-width: 1.4; }
.node-diagram .node-dot-active{ fill: var(--teal); stroke: var(--teal); }
.node-diagram text{
  font-family: "IBM Plex Mono", monospace;
  fill: var(--slate);
  font-size: 11px;
}

/* ---------- Stats bar ---------- */
.stats-grid{
  display:grid; grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--surface);
  margin-top: var(--space-5);
}
.stat{ padding: 1.4rem 1.2rem; border-right: 1px solid var(--line); }
.stat:last-child{ border-right:none; }
.stat .num{
  font-family:"IBM Plex Mono", monospace;
  font-size: 1.7rem; color: var(--ink); font-weight:600;
}
.stat .num span{ color: var(--teal); }
.stat .label{ font-size: .9rem; color: var(--slate-light); margin-top:.3rem; }

/* ---------- Services ---------- */
.services-grid{
  display:grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.services-grid.projects-grid{ grid-template-columns: repeat(3, 1fr); }
.service-card{
  background: var(--surface); padding: var(--space-3);
  display:flex; flex-direction:column; gap:.75rem;
}
.service-card .idx{
  font-family:"IBM Plex Mono", monospace;
  color: var(--teal); font-size: .9rem;
}
.service-card h3{ font-size: 1.08rem; }
.service-card p{ font-size: .92rem; color: var(--slate-light); margin:0; }

/* ---------- Start here / bands / about sub-sections ---------- */
.band-alt{ background: var(--surface); }
.start-grid{ display:grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-3); }
.start-card{
  display:flex; flex-direction:column; gap:.6rem;
  background: var(--paper); border:1px solid var(--line); border-radius: var(--radius);
  padding: var(--space-3); transition: border-color .15s;
}
.start-card:hover{ border-color: var(--teal); }
.start-card .idx{ font-family:"IBM Plex Mono", monospace; color: var(--teal); font-size:.9rem; }
.start-card h3{ font-size: 1.15rem; }
.start-card p{ margin:0; font-size:1rem; color: var(--slate-light); }
.start-card .start-link{
  margin-top:auto; padding-top:.5rem;
  font-family:"IBM Plex Mono", monospace; font-size:.9rem; color: var(--teal);
}
.service-card ul{ margin:0; padding-left:1.1rem; font-size:.95rem; color: var(--slate-light); }
.service-card li{ margin-bottom:.35rem; }
.service-card .card-link{
  margin-top:auto; font-family:"IBM Plex Mono", monospace; font-size:.9rem; color: var(--teal);
}
.services-note{ margin-top: var(--space-3); font-size:1rem; }
.services-note a{ color: var(--teal); border-bottom:1px solid currentColor; }
.about-sub{ margin-top: var(--space-5); }
.about-sub > h3{ font-size:1.5rem; margin-bottom: var(--space-3); }
.about-sub > p{ max-width:65ch; margin: 0 0 var(--space-3); color: var(--slate-light); }
.about-grid p{ max-width: 65ch; }
.case-body p, .case-quote p{ max-width: 80ch; }
.case-body li{ max-width: 80ch; }

/* Icon links (sidebar bottom on desktop, footer on phones) */
.icon{ width:24px; height:24px; fill: currentColor; }
.nav-profile a, .footer-social a{
  color: var(--slate); display:inline-flex; transition: color .15s;
}
.nav-profile a:hover, .footer-social a:hover{ color: var(--teal); }
.footer-social{ display:none; gap:1.25rem; justify-content:center; margin-top:1rem; }

/* ---------- Case studies ---------- */
.case-featured{
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface);
  overflow:hidden;
}
.case-featured .case-body{ padding: var(--space-4); }
.case-tag{
  display:inline-block;
  font-family:"IBM Plex Mono", monospace;
  font-size: .9rem;
  color: var(--teal-deep);
  background: var(--teal-tint);
  padding: .28rem .6rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
}
.case-featured h3{ font-size: 1.5rem; margin-bottom: .6rem; }
.case-metrics{
  display:grid; grid-template-columns: repeat(3,1fr); gap: 1rem;
  margin-top: 1.5rem; padding-top: 1.5rem; border-top: 1px solid var(--line-soft);
}
.case-metrics .m-num{ font-family:"IBM Plex Mono", monospace; color: var(--teal); font-weight:600; font-size:1.15rem; }
.case-metrics .m-label{ font-size: .9rem; color: var(--slate-light); }
.case-quote{
  border-left: 2px solid var(--teal);
  padding-left: 1.1rem;
  margin: 1.5rem 0 0;
}
.case-quote p{
  font-family:"IBM Plex Serif", serif;
  font-size: .98rem;
  font-style: italic;
  color: var(--ink-soft);
  line-height: 1.6;
  margin: 0 0 .6rem;
}
.case-quote cite{
  display: block;
  font-family:"IBM Plex Mono", monospace;
  font-style: normal;
  font-size: .9rem;
  color: var(--slate-light);
}
.case-quote cite span{ color: var(--teal); }
.case-quote .read-more,
.case-mini .read-more{
  display:inline-block; margin-top:.75rem;
  font-family:"IBM Plex Mono", monospace; font-size:.9rem;
  color: var(--teal); text-decoration:none;
  border-bottom:1px solid transparent;
}
.case-quote .read-more:hover,
.case-mini .read-more:hover{ border-bottom-color: var(--teal); }
.case-quote .read-more + .read-more{ margin-left: 1.25rem; }

.case-row{
  display:grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-3);
  margin-top: var(--space-3);
}
.case-mini{
  border:1px solid var(--line); border-radius: var(--radius); background: var(--surface);
  padding: var(--space-3);
}
.case-mini .case-tag{ margin-bottom: .75rem; }
.case-mini h4{ font-size: 1.12rem; margin-bottom:.5rem; }
.case-mini p{ font-size: .92rem; margin:0 0 .5rem; }
.case-mini ul{ margin:.5rem 0 0; padding-left: 1.1rem; font-size:.9rem; }
.case-mini li{ margin-bottom:.3rem; }

/* Article/tutorial feature strip */
.article-feature{
  border:1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(135deg, var(--ink) 0%, var(--teal-deep) 100%);
  color: var(--paper);
  padding: var(--space-4);
  display:grid; grid-template-columns: 1fr auto; gap: var(--space-4); align-items:center;
  margin-top: var(--space-3);
}
.article-feature h3,
.article-body .article-feature h3{ color:#fff; font-size:1.4rem; margin-bottom:.6rem; }
.article-feature p{ color: #D7E1DE; max-width:52ch; margin:0; }
.article-feature .btn{ background:#fff; color: var(--ink) !important; border-color:#fff; white-space:nowrap; }
.article-feature .btn:hover{ background: var(--brass); border-color: var(--brass); color:#fff !important;}

/* ---------- Skills ---------- */
.skills-grid{ display:grid; grid-template-columns: repeat(4,1fr); gap: var(--space-3); }
.skill-group .g-label{
  font-family:"IBM Plex Mono", monospace; font-size:.9rem; color: var(--brass);
  text-transform:uppercase; letter-spacing:.06em; margin-bottom: .9rem;
}
.skill-group .tag{ margin: 0 .4rem .4rem 0; display:inline-block; }

/* ---------- Timeline / education ---------- */
.timeline{ border-left: 1px solid var(--line); padding-left: var(--space-3); }
.tl-item{ position:relative; padding-bottom: var(--space-3); }
.tl-item:last-child{ padding-bottom:0; }
.tl-item::before{
  content:""; position:absolute; left:-1.42rem; top:.35rem;
  width:8px; height:8px; border-radius:50%;
  background: var(--surface); border:2px solid var(--teal);
}
.tl-item .tl-year{ font-family:"IBM Plex Mono", monospace; font-size:.9rem; color:var(--teal); }
.tl-item h4{ font-size:1.05rem; margin: .3rem 0 .2rem; }
.tl-item p{ font-size:.9rem; margin:0; color:var(--slate-light); }

/* ---------- About ---------- */
.about-grid{ display:grid; grid-template-columns: 0.9fr 1.1fr; gap: var(--space-5); align-items:start; }
.about-quote{
  font-family:"IBM Plex Serif", serif;
  font-size: 1.3rem; color: var(--ink); line-height:1.5;
  border-left: 2px solid var(--teal); padding-left: 1.25rem;
  margin: 1.5rem 0;
}
.pill{
  display:inline-flex; align-items:center; gap:.4rem;
  font-family:"IBM Plex Mono", monospace; font-size:.9rem;
  background: var(--brass-tint); color: var(--brass);
  padding:.35rem .7rem; border-radius: 20px;
}

/* ---------- Contact / Footer ---------- */
.contact-band{
  background: var(--ink); color: var(--paper);
  padding: var(--space-6) 0; text-align:center; border-bottom:none;
}
.contact-band h2{ color:#fff; font-size: clamp(1.8rem,4vw,2.6rem); }
.contact-band p{ color:#AEB8C4; max-width:50ch; margin: 1rem auto var(--space-4); }
.contact-links{ display:flex; gap:1rem; justify-content:center; flex-wrap:wrap; }
.contact-steps{
  list-style:none; margin: 0 auto var(--space-4); padding:0;
  max-width: 560px; text-align:left;
  display:flex; flex-direction:column; gap: .9rem;
}
.contact-steps li{
  display:flex; align-items:baseline; gap: .9rem;
  color:#D7E1DE; font-size:.98rem; line-height:1.5;
}
.contact-steps li span{
  font-family:"IBM Plex Mono", monospace;
  color: var(--teal-tint);
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius:50%;
  width:1.6rem; height:1.6rem;
  display:inline-flex; align-items:center; justify-content:center;
  font-size:.9rem; flex-shrink:0;
}
.contact-buckets{
  max-width:560px; margin: -.5rem auto var(--space-4); padding-left:1.25rem;
  text-align:left; color:#D7E1DE; font-size:.98rem; line-height:1.5;
}
.contact-buckets li{ margin-bottom:.6rem; }

/* Contact band rhythm: heading→text 1rem, text→button ~2rem, block→block 4rem + divider */
.contact-block + .contact-block{
  margin-top: var(--space-5); padding-top: var(--space-5);
  border-top: 1px solid rgba(255,255,255,.12);
}
.contact-block h2{ margin-bottom: 1rem; }
.contact-block + .contact-block h2{ font-size: clamp(1.4rem, 3vw, 1.9rem); }
.contact-block p{ margin: 0 auto 1rem; }
.contact-block .contact-buckets{ margin: 0 auto 1.5rem; }
.contact-block .contact-steps{ margin: 0 auto var(--space-3); }
.contact-block > .btn{ margin-top: 1rem; }
.contact-block .contact-links{ margin-top: .5rem; }
.contact-band .contact-note{
  color:#AEB8C4; font-size:.9rem; max-width:50ch; margin: var(--space-5) auto 0;
}
@media (max-width: 600px){
  .contact-block + .contact-block{ margin-top: var(--space-4); padding-top: var(--space-4); }
}
footer a{ color: var(--teal); text-decoration: underline; }
footer{
  padding: var(--space-3) 0; text-align:center;
  font-family:"IBM Plex Mono", monospace; font-size:.9rem; color: var(--slate-light);
}

/* ---------- Article page ---------- */
.article-hero{ padding: var(--space-5) 0 var(--space-4); border-bottom:1px solid var(--line-soft); }
.article-hero .eyebrow{ margin-bottom: var(--space-3); }
.article-hero h1{ font-size: clamp(1.9rem, 4vw, 2.9rem); max-width: 20ch; }
.article-meta{
  display:flex; gap: 1.5rem; margin-top: var(--space-3);
  font-family:"IBM Plex Mono", monospace; font-size:.9rem; color: var(--slate-light);
}
.article-body{ max-width: 720px; margin: 0 auto; padding: var(--space-5) var(--space-3); }
.article-body h2{ font-size: 1.5rem; margin-top: var(--space-5); margin-bottom: 1rem; }
.article-body h3{ font-size: 1.15rem; margin-top: var(--space-4); margin-bottom: .75rem; color: var(--teal-deep); }
.article-body p{ margin: 0 0 1.15rem; font-size: 1.03rem; }
.article-body ul, .article-body ol{ margin: 0 0 1.15rem; padding-left: 1.3rem; }
.article-body li{ margin-bottom: .5rem; }
.callout{
  border-left: 3px solid var(--teal);
  background: var(--teal-tint);
  color: var(--ink-soft);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.5rem 0;
  font-size: .95rem;
}
.callout .c-label{ font-family:"IBM Plex Mono", monospace; font-size:.9rem; text-transform:uppercase; color: var(--teal-deep); margin-bottom:.4rem; letter-spacing:.05em; }
.callout-warn{ border-color: var(--brass); background: var(--brass-tint); }
.callout-warn .c-label{ color: var(--brass); }
.figure{ margin: 2rem 0; border:1px solid var(--line); border-radius: var(--radius); background: var(--surface); padding: var(--space-3); }
.figure-caption{ font-family:"IBM Plex Mono", monospace; font-size:.9rem; color: var(--slate-light); margin-top: .9rem; text-align:center; }
.code-block{
  font-family:"IBM Plex Mono", monospace; font-size:.9rem;
  background: var(--ink); color: #D6E4DF;
  padding: 1.1rem 1.3rem; border-radius: var(--radius);
  overflow-x:auto; margin: 1.25rem 0; line-height:1.6;
}
.article-nav-back{ display:inline-flex; align-items:center; gap:.5rem; margin-bottom: var(--space-3); font-family:"IBM Plex Mono", monospace; font-size:.9rem; color: var(--teal); }
.takeaway-grid{ display:grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 1.5rem 0; }
.takeaway{ border:1px solid var(--line); border-radius: var(--radius); padding: 1rem 1.2rem; }
.takeaway .t-num{ font-family:"IBM Plex Mono", monospace; color: var(--teal); font-size:.9rem; }
.takeaway p{ margin:.4rem 0 0; font-size:.92rem; }

/* ---------- Reference: definitions & comparison tables ---------- */
.def-list{ margin: 1.5rem 0 2rem; }
.def-item{ padding: 1.1rem 0; border-top: 1px solid var(--line-soft); }
.def-item:first-child{ border-top:none; padding-top:0; }
.def-term{ font-family:"IBM Plex Mono", monospace; font-weight:600; color: var(--ink); font-size: .98rem; }
.def-tag{
  display:inline-block; font-family:"IBM Plex Mono", monospace; font-size:.9rem;
  background: var(--teal-tint); color: var(--teal-deep);
  padding: .18rem .55rem; border-radius: 3px; margin-left: .6rem; vertical-align:middle;
  letter-spacing: .03em;
}
.def-tag.tag-enterprise{ background: var(--brass-tint); color: var(--brass); }
.def-item p{ margin: .5rem 0 0; font-size: .95rem; }

.compare-wrap{ overflow-x:auto; margin: 0 0 2rem; border: 1px solid var(--line); border-radius: var(--radius); }
table.compare{ width:100%; border-collapse: collapse; font-size: .9rem; background: var(--surface); }
table.compare th{
  background: var(--ink); color:#fff;
  font-family:"IBM Plex Mono", monospace; font-weight:500; font-size:.9rem;
  text-transform: uppercase; letter-spacing:.04em;
  padding: .8rem .9rem; text-align:left; white-space: nowrap;
}
table.compare td{ padding: .85rem .9rem; border-top: 1px solid var(--line-soft); vertical-align: top; }
table.compare tr:nth-child(even) td{ background: var(--paper); }
table.compare td.strength{ color: var(--teal-deep); }
table.compare td.weakness{ color: var(--brass); }
table.compare td.name{ font-family:"IBM Plex Mono", monospace; font-weight:600; color: var(--ink); font-size:.9rem; }

/* ---------- Responsive ---------- */
@media (max-width: 900px){
  .hero-grid, .about-grid{ grid-template-columns: 1fr; }
  .stats-grid{ grid-template-columns: repeat(2,1fr); }
  .stat:nth-child(2){ border-right:none; }
  .services-grid, .services-grid.projects-grid{ grid-template-columns: repeat(2,1fr); }
  .case-featured{ grid-template-columns: 1fr; }
  .case-row{ grid-template-columns: 1fr; }
  .skills-grid{ grid-template-columns: repeat(2,1fr); }
  .article-feature{ grid-template-columns: 1fr; text-align:left; }
  .takeaway-grid{ grid-template-columns: 1fr; }

  .start-grid{ grid-template-columns: repeat(2,1fr); }
  .services-grid:not(.projects-grid){ grid-template-columns: 1fr; }
  .footer-social{ display:flex; }
  section{ scroll-margin-top: 4.5rem; }

  .nav-toggle-btn{ display:inline-flex; }
  .nav-links{
    display:none;
    position:absolute; top: calc(100% + .6rem); right:0;
    flex-direction:column; align-items:flex-start; gap: 1rem;
    background: var(--surface); border:1px solid var(--line); border-radius: var(--radius);
    padding: 1.25rem 1.5rem; min-width: 220px;
    box-shadow: 0 8px 24px -8px rgba(16,24,38,0.25);
    z-index: 60;
  }
  .nav-toggle[open] .nav-links{ display:flex; }
  .nav-sub-menu{
    position:static; box-shadow:none; border:0; border-left:2px solid var(--line);
    border-radius:0; padding:.25rem 0 .25rem 1rem; margin-top:.75rem; min-width:0;
  }
}

/* Phone widths — a few card grids that read fine at tablet's 2 columns
   become unreadably narrow/tall (measured: >500px-tall cards) below
   this width, so they collapse to a single column here specifically. */
@media (max-width: 600px){
  .start-grid{ grid-template-columns: 1fr; }
  .stats-grid{ grid-template-columns: 1fr; }
  .stat{ border-right:none; border-bottom: 1px solid var(--line); }
  .stat:last-child{ border-bottom:none; }
  #services .services-grid,
  .services-grid.projects-grid{ grid-template-columns: 1fr; }
  .case-metrics{ grid-template-columns: 1fr; gap: .75rem; }
}

/* ---------- Desktop: fixed left sidebar + scrolling right column ---------- */
@media (min-width: 901px){
  :root{ --sidebar-w: 300px; }
  body{ padding-left: var(--sidebar-w); }
  .site-header{
    position: fixed; top:0; left:0; bottom:0; width: var(--sidebar-w);
    background: var(--surface); backdrop-filter:none;
    border-bottom:none; border-right:1px solid var(--line);
    overflow-y:auto;
  }
  .nav{
    min-height:100%; flex-direction:column; align-items:stretch; justify-content:flex-start;
    gap: 1.75rem; padding: 2.5rem 1.75rem 1.75rem;
  }
  .logo{ font-size:1.15rem; }
  .nav-role{
    display:block; margin:.75rem 0 0;
    font-family:"IBM Plex Mono", monospace; font-size:.95rem; color: var(--teal);
  }
  .nav-pitch{ display:block; margin:.6rem 0 0; font-size:1rem; line-height:1.5; color: var(--slate-light); }
  .nav-links{ flex-direction:column; align-items:flex-start; gap:.9rem; font-size:.98rem; }
  .nav-sub-menu{
    position:static; box-shadow:none; border:0; border-left:2px solid var(--line);
    border-radius:0; padding:.25rem 0 .25rem 1rem; margin-top:.75rem; min-width:0;
  }
  .nav-cta{ justify-content:center; }
  .nav-profile{ display:flex; gap:1.25rem; margin-top:auto; padding-top:1.5rem; }
}