/* ==========================================================================
   medhaja.me — site styles
   One stylesheet shared by / and /isocline/. No framework.
   ========================================================================== */

:root {
  --bg: #faf9f6;
  --surface: #ffffff;
  --text: #1a1a18;
  --muted: #5b5a55;
  --faint: #76746d;
  --border: #e3e1da;
  --border-strong: #cfccc3;
  --accent: #0d6b5e;
  --accent-strong: #09544a;
  --accent-soft: #e7f1ee;

  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --wrap: 72rem;
  --gutter: clamp(1.25rem, 4vw, 2.5rem);
  --nav-h: 4rem;
  --section-y: clamp(4.5rem, 10vw, 7.5rem);
  --radius: 6px;
}

*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-padding-top: calc(var(--nav-h) + 1.25rem);
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

p { margin: 0 0 1rem; }
p:last-child { margin-bottom: 0; }

ul, ol { margin: 0; padding: 0; }

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}
a:hover { color: var(--accent-strong); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem; top: -3rem;
  z-index: 100;
  padding: 0.6rem 1rem;
  background: var(--text);
  color: #fff;
  font-family: var(--mono);
  font-size: 0.8rem;
  border-radius: var(--radius);
}
.skip-link:focus { top: 0.75rem; color: #fff; }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* --------------------------------------------------------------------------
   Type helpers
   -------------------------------------------------------------------------- */

.mono,
.label {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
}

.label {
  display: block;
  color: var(--faint);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
}

.section-head { margin-bottom: clamp(2.5rem, 5vw, 3.5rem); }
.section-head .label { margin-bottom: 0.9rem; }
.section-head h2 {
  font-size: clamp(1.75rem, 3.6vw, 2.4rem);
  max-width: 24ch;
}
.section-head p {
  margin-top: 1rem;
  color: var(--muted);
  max-width: 60ch;
}

.lead {
  font-size: clamp(1.1rem, 1.8vw, 1.25rem);
  color: var(--muted);
  max-width: 62ch;
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  background: rgba(250, 249, 246, 0.94);
  border-bottom: 1px solid var(--border);
}
@supports (backdrop-filter: blur(8px)) {
  .site-header {
    background: rgba(250, 249, 246, 0.82);
    backdrop-filter: saturate(140%) blur(8px);
  }
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
}

.brand {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.9rem;
  letter-spacing: 0.18em;
  color: var(--text);
  text-decoration: none;
}
.brand:hover { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  padding: 0.5rem 0;
}
.nav-links a:hover,
.nav-links a[aria-current="true"] { color: var(--text); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  min-height: 2.75rem;
  padding: 0 0.85rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font: 500 0.75rem/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
}
.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  display: block;
  width: 14px;
  height: 1.5px;
  background: currentColor;
  content: "";
}
.nav-toggle-bars { position: relative; }
.nav-toggle-bars::before { position: absolute; top: -4.5px; }
.nav-toggle-bars::after  { position: absolute; top: 4.5px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after  { top: 0; transform: rotate(-45deg); }

@media (max-width: 760px) {
  .js .nav-toggle { display: inline-flex; }

  .js .nav-links {
    position: absolute;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    padding: 0.5rem var(--gutter) 1.25rem;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 12px 24px -18px rgba(0, 0, 0, 0.25);
  }
  .js .nav-links[hidden] { display: none; }
  .js .nav-links a {
    display: block;
    padding: 0.9rem 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.85rem;
  }
  .js .nav-links li:last-child a { border-bottom: 0; }

  /* Without JS, links stay visible and wrap. */
  html:not(.js) .nav { height: auto; min-height: var(--nav-h); flex-wrap: wrap; padding: 0.75rem 0; gap: 0.5rem 1.25rem; }
  html:not(.js) .nav-links { flex-wrap: wrap; gap: 0 1.25rem; }
}

/* --------------------------------------------------------------------------
   Buttons and links
   -------------------------------------------------------------------------- */

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.875rem;
  padding: 0 1.25rem;
  border: 1px solid var(--text);
  border-radius: var(--radius);
  font: 500 0.8rem/1 var(--mono);
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.btn-primary { background: var(--text); color: #fff; }
.btn-primary:hover { background: var(--accent-strong); border-color: var(--accent-strong); color: #fff; }
.btn-secondary { background: transparent; color: var(--text); border-color: var(--border-strong); }
.btn-secondary:hover { border-color: var(--text); color: var(--text); }

.text-link {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--border-strong);
  padding: 0.35rem 0 0.15rem;
}
.text-link:hover { color: var(--accent); border-color: var(--accent); }

.ext::after {
  content: "\2197";
  display: inline-block;
  margin-left: 0.3em;
  font-family: var(--mono);
  font-size: 0.85em;
}

.link-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  list-style: none;
}

/* --------------------------------------------------------------------------
   Sections
   -------------------------------------------------------------------------- */

main > section,
.section {
  padding: var(--section-y) 0;
  border-top: 1px solid var(--border);
}

/* Hero */
.hero {
  padding-top: calc(var(--nav-h) + clamp(4rem, 12vw, 8.5rem));
  padding-bottom: clamp(4rem, 9vw, 6.5rem);
  border-top: 0 !important;
}
.hero .label { margin-bottom: 1.75rem; }
.hero h1 {
  font-size: clamp(2.4rem, 6.2vw, 4.4rem);
  letter-spacing: -0.035em;
  line-height: 1.05;
  max-width: 17ch;
}
.hero .lead { margin-top: 1.75rem; }

.availability {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  margin-top: 1.75rem;
  color: var(--text);
}
.availability::before {
  content: "";
  flex: none;
  width: 0.5rem; height: 0.5rem;
  border-radius: 50%;
  background: var(--accent);
  transform: translateY(-0.05rem);
}

.hero .actions { margin-top: 2.5rem; }
.hero .link-list { margin-top: 1.75rem; }

/* Featured product */
.feature {
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
}
.feature-title {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
}
.feature-title h3 { font-size: clamp(2rem, 4.5vw, 3rem); letter-spacing: -0.03em; }
.feature-tagline {
  margin-top: 0.75rem;
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  color: var(--text);
  max-width: 44ch;
}

.feature-body {
  display: grid;
  gap: clamp(2rem, 4vw, 3rem);
}
@media (min-width: 900px) {
  .feature-body { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
}

.facts { display: grid; gap: 1.5rem; }
.facts dt { margin-bottom: 0.35rem; }
.facts dd { margin: 0; color: var(--muted); }

.checklist {
  list-style: none;
  display: grid;
  gap: 0.65rem;
}
.checklist li {
  position: relative;
  padding-left: 1.4rem;
  color: var(--muted);
}
.checklist li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.72em;
  width: 0.55rem; height: 1px;
  background: var(--accent);
}
.checklist strong { color: var(--text); font-weight: 600; }

.shot {
  margin: 0;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  overflow: hidden;
  background: var(--surface);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 18px 40px -28px rgba(0, 0, 0, 0.35);
}
.shot-bar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 0.8rem;
  border-bottom: 1px solid var(--border);
  background: #f3f2ee;
}
.shot-bar span {
  width: 0.5rem; height: 0.5rem;
  border-radius: 50%;
  background: var(--border-strong);
}
.shot-bar code {
  margin-left: 0.5rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--faint);
}
.caption {
  margin-top: 0.85rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--faint);
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
}
.tag {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--surface);
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--muted);
  white-space: nowrap;
}

/* Earlier work */
.subsection {
  margin-top: clamp(4rem, 9vw, 6rem);
  padding-top: clamp(2.5rem, 5vw, 3.5rem);
  border-top: 1px solid var(--border);
}
.subsection-head { margin-bottom: 2rem; }
.subsection-head h3 { font-size: 1.35rem; margin-top: 0.6rem; }
.subsection-head p { margin-top: 0.6rem; color: var(--muted); max-width: 62ch; }

.cards {
  display: grid;
  gap: 1rem;
}
@media (min-width: 900px) {
  .cards { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.card {
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}
.card h4 { font-size: 1.05rem; line-height: 1.35; letter-spacing: -0.01em; }
.card .label { margin-bottom: 0.75rem; }
.card dl { margin: 1.25rem 0 0; display: grid; gap: 0.9rem; font-size: 0.94rem; }
.card dt { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); margin-bottom: 0.15rem; }
.card dd { margin: 0; color: var(--muted); }
.card .card-links { margin-top: auto; padding-top: 1.5rem; }
.card code { font-family: var(--mono); font-size: 0.85em; color: var(--text); }

/* Experience */
.timeline { list-style: none; }
.role {
  display: grid;
  gap: 0.5rem 2rem;
  padding: 1.75rem 0;
  border-top: 1px solid var(--border);
}
.role:last-child { border-bottom: 1px solid var(--border); }
@media (min-width: 760px) {
  .role { grid-template-columns: 12rem minmax(0, 1fr); }
}
.role-dates { color: var(--faint); padding-top: 0.2rem; }
.role h3 { font-size: 1.15rem; letter-spacing: -0.01em; }
.role .org { color: var(--muted); margin-top: 0.15rem; }
.role .current {
  display: inline-block;
  margin-left: 0.5rem;
  padding: 0.05rem 0.45rem;
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  vertical-align: 0.15em;
}
.role .checklist { margin-top: 1rem; }

/* Capabilities */
.cap-grid {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--border);
}
@media (min-width: 760px) {
  .cap-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 3rem; }
}
@media (min-width: 1100px) {
  .cap-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
.cap {
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--border);
}
.cap h3 { font-size: 1rem; letter-spacing: -0.005em; }
.cap p { margin-top: 0.5rem; color: var(--muted); font-size: 0.97rem; }
.cap .evidence { margin-top: 0.85rem; font-size: 0.74rem; color: var(--faint); }
.cap .evidence a { color: var(--muted); }
.cap .evidence a:hover { color: var(--accent); }

/* About */
.prose { max-width: 64ch; }
.prose p { font-size: 1.12rem; color: var(--text); }
.prose p + p { margin-top: 1.25rem; }

/* Education */
.edu-grid { display: grid; gap: 3rem; }
@media (min-width: 900px) {
  .edu-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); }
}
.edu-grid h3 { font-size: 1rem; margin-bottom: 1rem; }
.edu-item { color: var(--muted); }
.edu-item strong { display: block; color: var(--text); font-weight: 600; }

.cert-list { list-style: none; border-top: 1px solid var(--border); }
.cert-list li {
  display: grid;
  gap: 0.25rem 1.5rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}
@media (min-width: 640px) {
  .cert-list li { grid-template-columns: minmax(0, 1fr) auto; align-items: baseline; }
}
.cert-title { font-weight: 500; }
.cert-provider { display: block; color: var(--muted); font-size: 0.92rem; }

/* Contact */
.contact h2 { font-size: clamp(2rem, 5vw, 3.2rem); letter-spacing: -0.03em; max-width: 18ch; }
.paths {
  display: grid;
  gap: 1rem;
  margin-top: clamp(2.5rem, 5vw, 3.5rem);
}
@media (min-width: 760px) {
  .paths { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
.path {
  padding: 1.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}
.path h3 { font-size: 1.05rem; margin: 0.6rem 0 0.5rem; }
.path p { color: var(--muted); }
.contact .actions { margin-top: 2.5rem; }
.contact-meta {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
  list-style: none;
  color: var(--muted);
}

/* Footer */
.site-footer {
  padding: 2rem 0 2.5rem;
  border-top: 1px solid var(--border);
  color: var(--faint);
}
.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem 2rem;
}
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--accent); }

/* --------------------------------------------------------------------------
   Case study
   -------------------------------------------------------------------------- */

.cs-hero { padding-top: calc(var(--nav-h) + clamp(3rem, 8vw, 5.5rem)); padding-bottom: clamp(3rem, 6vw, 4.5rem); border-top: 0 !important; }
.crumb { display: inline-block; margin-bottom: 2rem; }
.cs-hero h1 { font-size: clamp(2.2rem, 5.4vw, 3.8rem); letter-spacing: -0.035em; line-height: 1.06; max-width: 20ch; }
.cs-hero .lead { margin-top: 1.5rem; }

.cs-meta {
  display: grid;
  gap: 1.25rem 2rem;
  margin: 2.5rem 0 0;
  padding: 1.5rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
@media (min-width: 640px)  { .cs-meta { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1000px) { .cs-meta { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.cs-meta dt { margin-bottom: 0.3rem; }
.cs-meta dd { margin: 0; font-size: 0.95rem; }

.cs-hero .actions { margin-top: 2rem; }
.cs-shot { margin-top: clamp(3rem, 6vw, 4.5rem); }

.cs-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem 3rem;
}
.cs-section > * { min-width: 0; }
@media (min-width: 960px) {
  .cs-section { grid-template-columns: 14rem minmax(0, 1fr); }
}
.cs-section > header .label { margin-bottom: 0.6rem; }
.cs-section > header h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
.cs-content { max-width: 46rem; }
.cs-content > * + * { margin-top: 1.25rem; }
.cs-content h3 { font-size: 1.1rem; margin-top: 2.25rem; }
.cs-content p, .cs-content li { color: var(--muted); }
.cs-content p strong, .cs-content li strong { color: var(--text); }
.cs-content code { font-family: var(--mono); font-size: 0.86em; background: #efede7; padding: 0.08em 0.35em; border-radius: 3px; color: var(--text); }

.decisions { list-style: none; display: grid; gap: 0; border-top: 1px solid var(--border); }
.decisions li { padding: 1.4rem 0; border-bottom: 1px solid var(--border); }
.decisions h4 { font-size: 1rem; color: var(--text); letter-spacing: -0.005em; }
.decisions p { margin-top: 0.45rem; }
.decisions .tradeoff { font-size: 0.93rem; }
.decisions .tradeoff::before { content: "Tradeoff · "; font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--faint); }

/* Architecture diagram (HTML, reflows on small screens) */
.arch {
  margin: 0;
  padding: clamp(1rem, 3vw, 1.75rem);
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}
.arch-tier { display: grid; gap: 0.75rem; }
.arch-tier + .arch-tier { margin-top: 0.25rem; }
.arch-tier-label { font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--faint); }
.arch-row { display: grid; gap: 0.6rem; }
@media (min-width: 560px) {
  .arch-row.c2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .arch-row.c3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
.node {
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--border-strong);
  border-radius: 5px;
  background: var(--bg);
  font-size: 0.9rem;
  line-height: 1.4;
}
.node strong { display: block; font-weight: 600; color: var(--text); }
.node span { display: block; margin-top: 0.15rem; font-family: var(--mono); font-size: 0.72rem; color: var(--muted); }
.node.key { border-color: var(--accent); background: var(--accent-soft); }
.arch-arrow {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 0 0.55rem 1rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--faint);
}
.arch-arrow::before { content: "\2193"; font-size: 1rem; color: var(--accent); }
.arch figcaption { margin-top: 1.25rem; }

.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
caption { text-align: left; padding: 0.9rem 1rem; font-family: var(--mono); font-size: 0.72rem; color: var(--faint); border-bottom: 1px solid var(--border); }
th, td { padding: 0.65rem 1rem; text-align: left; border-bottom: 1px solid var(--border); vertical-align: top; }
thead th { font-family: var(--mono); font-size: 0.7rem; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; color: var(--faint); white-space: nowrap; }
tbody tr:last-child th, tbody tr:last-child td { border-bottom: 0; }
td.num { font-family: var(--mono); font-size: 0.82rem; white-space: nowrap; color: var(--text); }
tbody th { font-weight: 500; color: var(--text); }

.note {
  padding: 1rem 1.15rem;
  border-left: 2px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.95rem;
}
.note p { color: var(--text); }

.evidence-list { list-style: none; border-top: 1px solid var(--border); }
.evidence-list li { display: grid; gap: 0.2rem 1.5rem; padding: 1rem 0; border-bottom: 1px solid var(--border); }
@media (min-width: 640px) { .evidence-list li { grid-template-columns: 9rem minmax(0, 1fr); } }
.evidence-list .label { padding-top: 0.25rem; }

/* --------------------------------------------------------------------------
   Motion: a single, subtle reveal. Disabled for reduced motion and without JS.
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: no-preference) {
  .js .reveal { opacity: 0; transform: translateY(12px); transition: opacity 0.6s ease, transform 0.6s ease; }
  .js .reveal.is-visible { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}

@media print {
  .site-header, .skip-link { display: none; }
  .hero { padding-top: 2rem; }
  a.ext::after { content: " (" attr(href) ")"; font-size: 0.75em; }
}