/* =========================================================
   GRTC CORP — RELIABLE TECHNOLOGY SOLUTIONS
   Concept: "Signal & Circuit" — cool slate/navy surfaces with
   an electric indigo + cyan accent pair, evoking AI, full-stack
   engineering, and decentralized systems. Built for a technology
   delivery company (strategy, integrations, AI/ML, blockchain).
   ========================================================= */

/* ---------- Type Scale ---------- */
:root {
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(2.75rem, 1rem + 6vw, 6.5rem);

  /* ---------- Spacing (4px system) ---------- */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* ---------- Radius & Motion ---------- */
  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);

  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1240px;
  --content-full: 100%;

  --font-display: 'General Sans', 'Segoe UI', sans-serif;
  --font-body: 'Satoshi', 'Inter', 'Segoe UI', sans-serif;
}

/* ---------- Color: Light (default) ---------- */
:root,
[data-theme='light'] {
  --color-bg: #f3f5fa;
  --color-surface: #ffffff;
  --color-surface-2: #eef1f7;
  --color-surface-offset: #e6eaf3;
  --color-surface-offset-2: #dbe1ee;
  --color-divider: #d7dceb;
  --color-border: #c5cce0;

  --color-text: #10131f;
  --color-text-muted: #565d70;
  --color-text-faint: #8891a3;
  --color-text-inverse: #f6f8fc;

  /* Electric indigo — primary accent */
  --color-primary: #4f46e5;
  --color-primary-hover: #4338ca;
  --color-primary-active: #3730a3;
  --color-primary-highlight: #e7e5fb;

  /* Cyan — secondary accent (tags, data, icons) */
  --color-accent-2: #0e7490;
  --color-accent-2-highlight: #d7f0f5;

  --color-success: #15803d;
  --color-warning: #b45309;

  --shadow-sm: 0 1px 2px oklch(0.2 0.03 260 / 0.08);
  --shadow-md: 0 8px 20px oklch(0.2 0.03 260 / 0.1);
  --shadow-lg: 0 20px 48px oklch(0.2 0.03 260 / 0.16);

  --grid-line: oklch(0.2 0.03 260 / 0.035);
}

/* ---------- Color: Dark ---------- */
[data-theme='dark'] {
  --color-bg: #080b13;
  --color-surface: #0e1220;
  --color-surface-2: #121729;
  --color-surface-offset: #171d31;
  --color-surface-offset-2: #1d2438;
  --color-divider: #232a40;
  --color-border: #2a3149;

  --color-text: #e7eaf5;
  --color-text-muted: #98a0b8;
  --color-text-faint: #626a83;
  --color-text-inverse: #0b0e18;

  --color-primary: #818cf8;
  --color-primary-hover: #a5b4fc;
  --color-primary-active: #c7d2fe;
  --color-primary-highlight: #23213f;

  --color-accent-2: #22d3ee;
  --color-accent-2-highlight: #10222b;

  --color-success: #34d399;
  --color-warning: #f59e0b;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
  --shadow-md: 0 8px 20px oklch(0 0 0 / 0.35);
  --shadow-lg: 0 24px 56px oklch(0 0 0 / 0.5);

  --grid-line: oklch(1 0 0 / 0.06);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #080b13;
    --color-surface: #0e1220;
    --color-surface-2: #121729;
    --color-surface-offset: #171d31;
    --color-surface-offset-2: #1d2438;
    --color-divider: #232a40;
    --color-border: #2a3149;
    --color-text: #e7eaf5;
    --color-text-muted: #98a0b8;
    --color-text-faint: #626a83;
    --color-text-inverse: #0b0e18;
    --color-primary: #818cf8;
    --color-primary-hover: #a5b4fc;
    --color-primary-active: #c7d2fe;
    --color-primary-highlight: #23213f;
    --color-accent-2: #22d3ee;
    --color-accent-2-highlight: #10222b;
    --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
    --shadow-md: 0 8px 20px oklch(0 0 0 / 0.35);
    --shadow-lg: 0 24px 56px oklch(0 0 0 / 0.5);
    --grid-line: oklch(1 0 0 / 0.06);
  }
}

/* =========================================================
   BASE ELEMENTS
   ========================================================= */
body {
  background-color: var(--color-bg);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 64px 64px;
  background-attachment: fixed;
}

::selection {
  background: color-mix(in oklab, var(--color-primary) 30%, transparent);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  letter-spacing: -0.01em;
}

p, li {
  max-width: 68ch;
}

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

.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-5), 5vw, var(--space-12));
}

.container--narrow {
  max-width: var(--content-default);
}

main {
  overflow-x: clip;
}

section {
  padding-block: clamp(var(--space-16), 9vw, var(--space-32));
  position: relative;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.eyebrow::before {
  content: '';
  width: 22px;
  height: 1.5px;
  background: var(--color-primary);
  display: inline-block;
}

.section-title {
  font-size: var(--text-2xl);
  font-weight: 600;
  margin-top: var(--space-4);
  max-width: 18ch;
}

.section-lede {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  font-weight: 400;
  margin-top: var(--space-5);
  max-width: 56ch;
  line-height: 1.55;
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-end;
  gap: var(--space-8);
  margin-bottom: clamp(var(--space-10), 6vw, var(--space-16));
}

.section-head__meta {
  max-width: 320px;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  padding-bottom: var(--space-1);
}

/* =========================================================
   SCROLL REVEAL (IntersectionObserver driven, CLS-safe)
   ========================================================= */
.reveal {
  opacity: 0;
  clip-path: inset(12% 0 0 0);
  transition:
    opacity 0.7s var(--ease-out),
    clip-path 0.7s var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}
.reveal.is-visible {
  opacity: 1;
  clip-path: inset(0 0 0 0);
}
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    clip-path: none;
    transition: none;
  }
}

/* =========================================================
   NAVIGATION
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in oklab, var(--color-bg) 82%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition:
    border-color var(--transition-interactive),
    transform 0.35s var(--ease-in-out);
}
.site-header.is-scrolled {
  border-bottom-color: var(--color-divider);
}
.site-header.is-hidden {
  transform: translateY(-100%);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding-block: var(--space-4);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-sm);
  letter-spacing: 0.01em;
  color: var(--color-text);
}

.brand-mark {
  width: 34px;
  height: 34px;
  object-fit: contain;
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.brand-text span {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.03em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-links a {
  position: relative;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding-block: var(--space-1);
}
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -3px;
  height: 1.5px;
  background: var(--color-primary);
  transition: right var(--transition-interactive);
}
.nav-links a:hover,
.nav-links a[aria-current='page'] {
  color: var(--color-text);
}
.nav-links a:hover::after,
.nav-links a[aria-current='page']::after {
  right: 0;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}
.icon-btn:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}
.icon-btn svg {
  width: 18px;
  height: 18px;
}

.nav-toggle {
  position: relative;
}
.nav-toggle .icon-close {
  position: absolute;
  opacity: 0;
  transform: rotate(-45deg) scale(0.6);
  transition: opacity var(--transition-interactive), transform var(--transition-interactive);
}
.nav-toggle .icon-hamburger {
  transition: opacity var(--transition-interactive), transform var(--transition-interactive);
}
.nav-toggle.is-active .icon-hamburger {
  opacity: 0;
  transform: rotate(45deg) scale(0.6);
}
.nav-toggle.is-active .icon-close {
  opacity: 1;
  transform: rotate(0) scale(1);
}

.nav-cta {
  margin-left: var(--space-1);
}

.nav-toggle {
  display: none;
}

@media (max-width: 860px) {
  .nav-cta.btn {
    display: none;
  }
}

@media (max-width: 480px) {
  .brand-text span {
    display: none;
  }
}

.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 90;
  background: var(--color-bg);
  padding: calc(var(--space-20) + var(--space-8)) var(--space-6) var(--space-12);
  transform: translateY(-8px);
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 0.3s var(--ease-out),
    transform 0.3s var(--ease-out);
}
.mobile-menu.is-open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.mobile-menu nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.mobile-menu a {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 500;
  padding-block: var(--space-4);
  border-bottom: 1px solid var(--color-divider);
  color: var(--color-text);
}

@media (max-width: 860px) {
  .nav-links {
    display: none;
  }
  .nav-toggle {
    display: inline-flex;
  }
  .mobile-menu {
    display: block;
  }
}

/* =========================================================
   BUTTONS
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  transition:
    background var(--transition-interactive),
    color var(--transition-interactive),
    border-color var(--transition-interactive),
    transform var(--transition-interactive),
    box-shadow var(--transition-interactive);
}
.btn svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-interactive);
}
.btn:hover svg {
  transform: translate(2px, -2px);
}
.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  border-color: var(--color-border);
  color: var(--color-text);
}
.btn-outline:hover {
  border-color: var(--color-primary);
  background: var(--color-surface-offset);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

/* =========================================================
   HERO
   ========================================================= */
.hero {
  padding-top: clamp(var(--space-16), 12vw, var(--space-24));
  padding-bottom: clamp(var(--space-16), 9vw, var(--space-24));
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(var(--space-10), 6vw, var(--space-16));
  align-items: center;
}
.hero-copy h1 {
  font-size: clamp(2.25rem, 1.5rem + 3.6vw, 4.5rem);
  font-weight: 600;
  line-height: 1.08;
  max-width: 17ch;
  margin-top: var(--space-5);
}

.hero-copy h1 em {
  font-style: normal;
  color: var(--color-primary);
}

.hero-lede {
  margin-top: var(--space-6);
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 54ch;
  line-height: 1.6;
}

.hero-actions {
  margin-top: var(--space-10);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, auto);
  gap: clamp(var(--space-6), 4vw, var(--space-12));
  margin-top: clamp(var(--space-14), 8vw, var(--space-20));
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-divider);
}

.stat b {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text);
}
.stat span {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  max-width: 16ch;
}

/* Hero visual — animated blueprint/network diagram */
.hero-visual {
  position: relative;
  aspect-ratio: 1 / 1.05;
}
.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

@media (max-width: 980px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .hero-visual {
    order: -1;
    max-width: 420px;
    margin-inline: auto;
    aspect-ratio: 1.3/1;
  }
  .hero-stats {
    grid-template-columns: repeat(3, 1fr);
  }
}
@media (max-width: 560px) {
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    row-gap: var(--space-6);
  }
}

/* =========================================================
   BENTO / CAPABILITIES GRID
   ========================================================= */
.bento {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}
.bento-card {
  grid-column: span 1;
  padding: var(--space-8);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition:
    transform var(--transition-interactive),
    box-shadow var(--transition-interactive),
    border-color var(--transition-interactive);
}
.bento-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: color-mix(in oklab, var(--color-primary) 40%, var(--color-border));
}
.bento-card .icon-tile {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  margin-bottom: var(--space-6);
}
.bento-card .icon-tile svg {
  width: 24px;
  height: 24px;
}
.bento-card h3 {
  font-size: var(--text-lg);
  font-weight: 600;
}
.bento-card p {
  margin-top: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--text-base);
}

@media (max-width: 860px) {
  .bento { grid-template-columns: 1fr; }
  .bento-card { grid-column: span 1; }
}
@media (min-width: 861px) and (max-width: 1180px) {
  .bento { grid-template-columns: repeat(2, 1fr); }
  .bento-card { grid-column: span 1; }
}

/* =========================================================
   APPROACH TIMELINE
   ========================================================= */
.timeline {
  position: relative;
  display: grid;
  gap: 0;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 27px;
  top: 8px;
  bottom: 8px;
  width: 1.5px;
  background: var(--color-divider);
}
.timeline-step {
  position: relative;
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: var(--space-6);
  padding-block: var(--space-8);
}
.timeline-step:not(:last-child) {
  border-bottom: 1px solid transparent;
}
.timeline-marker {
  position: relative;
  z-index: 1;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--color-text-muted);
  transition:
    color var(--transition-interactive),
    border-color var(--transition-interactive),
    background var(--transition-interactive);
}
.timeline-step.is-visible .timeline-marker {
  color: var(--color-text-inverse);
  background: var(--color-primary);
  border-color: var(--color-primary);
}
.timeline-body h3 {
  font-size: var(--text-lg);
  font-weight: 600;
}
.timeline-body p {
  margin-top: var(--space-2);
  color: var(--color-text-muted);
}
.timeline-body .tag-row {
  margin-top: var(--space-4);
}

/* =========================================================
   TAGS / PILLS
   ========================================================= */
.tag {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--color-accent-2-highlight);
  color: var(--color-accent-2);
}
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* =========================================================
   TECH STRIP (core technologies, single line)
   ========================================================= */
.tech-strip {
  padding-block: var(--space-10);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}
.tech-strip .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-5) var(--space-8);
}
.tech-strip-label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  flex-shrink: 0;
}
.tech-strip .tag-row {
  flex: 1;
  min-width: 260px;
}
.tech-strip-note {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  flex-basis: 100%;
}

/* =========================================================
   PULL QUOTE
   ========================================================= */
.pull-quote {
  position: relative;
  padding: clamp(var(--space-10), 6vw, var(--space-16));
  background: var(--color-surface-offset);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
}
.pull-quote blockquote {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 500;
  line-height: 1.35;
  max-width: 46ch;
}
.pull-quote blockquote::before {
  content: '\201C';
  color: var(--color-primary);
}
.pull-quote footer {
  margin-top: var(--space-6);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-style: normal;
}
.pull-quote footer strong {
  color: var(--color-text);
  display: block;
  font-size: var(--text-base);
}

/* =========================================================
   CTA BAND
   ========================================================= */
.cta-band {
  background: var(--color-text);
  color: var(--color-text-inverse);
  border-radius: var(--radius-xl);
  padding: clamp(var(--space-12), 7vw, var(--space-20));
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-8);
  position: relative;
  overflow: hidden;
}
[data-theme='dark'] .cta-band {
  background: var(--color-surface-offset-2);
  color: var(--color-text);
}
.cta-band h2 {
  font-size: var(--text-xl);
  max-width: 20ch;
}
.cta-band p {
  color: color-mix(in oklab, var(--color-text-inverse) 65%, transparent);
  margin-top: var(--space-3);
}
[data-theme='dark'] .cta-band p {
  color: var(--color-text-muted);
}
.cta-band .btn-primary {
  background: var(--color-primary);
}
.cta-band .btn-outline {
  border-color: color-mix(in oklab, var(--color-text-inverse) 30%, transparent);
  color: var(--color-text-inverse);
}
[data-theme='dark'] .cta-band .btn-outline {
  border-color: var(--color-border);
  color: var(--color-text);
}

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer {
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-16) var(--space-10);
}
.footer-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-10);
  padding-bottom: var(--space-10);
  border-bottom: 1px solid var(--color-divider);
}
.footer-brand p {
  margin-top: var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  max-width: 32ch;
}
.footer-cols {
  display: flex;
  gap: clamp(var(--space-8), 6vw, var(--space-20));
}
.footer-col h4 {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
}
.footer-col a,
.footer-col span {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding-block: var(--space-1);
}
.footer-col a:hover {
  color: var(--color-primary);
}
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-4);
  padding-top: var(--space-6);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* =========================================================
   PAGE HEADER (interior pages)
   ========================================================= */
.page-header {
  padding-top: clamp(var(--space-14), 9vw, var(--space-20));
  padding-bottom: clamp(var(--space-10), 6vw, var(--space-14));
}
.page-header h1 {
  font-size: var(--text-2xl);
  font-weight: 600;
  margin-top: var(--space-5);
  max-width: 20ch;
}
.page-header .section-lede {
  max-width: 60ch;
}

/* =========================================================
   CASE STUDIES (Task-Approach-Result)
   ========================================================= */
.case-list {
  display: grid;
  gap: var(--space-6);
}

.case-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  overflow: hidden;
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}
.case-card:hover {
  box-shadow: var(--shadow-md);
}

.case-summary {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-6);
  padding: clamp(var(--space-6), 4vw, var(--space-8));
  text-align: left;
  cursor: pointer;
  list-style: none;
}
.case-summary::-webkit-details-marker { display: none; }
.case-summary::marker { content: ''; }
.case-summary::-moz-list-bullet { list-style-type: none; }

.case-index {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text-faint);
  flex-shrink: 0;
  width: 2.4ch;
}

.case-summary-main {
  flex: 1;
  min-width: 0;
}
.case-summary-main .tag-row {
  margin-bottom: var(--space-3);
}
.case-summary-main h3 {
  font-size: var(--text-lg);
  font-weight: 600;
}
.case-summary-main p {
  margin-top: var(--space-2);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.case-toggle {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  display: grid;
  place-items: center;
  color: var(--color-text-muted);
  transition: transform 0.3s var(--ease-in-out), background var(--transition-interactive);
}
.case-toggle svg {
  width: 16px;
  height: 16px;
  transition: transform 0.3s var(--ease-in-out);
}
details[open] .case-toggle {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}
details[open] .case-toggle svg {
  transform: rotate(45deg);
}

.case-body {
  padding: 0 clamp(var(--space-6), 4vw, var(--space-8)) clamp(var(--space-8), 5vw, var(--space-10));
  border-top: 1px solid var(--color-divider);
  margin-top: 0;
}

.tar-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
  padding-top: clamp(var(--space-6), 4vw, var(--space-8));
}
.tar-block {
  border-left: 2px solid var(--color-divider);
  padding-left: var(--space-5);
  position: relative;
}
.tar-block.is-result { border-left-color: var(--color-primary); }
.tar-block h4 {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
}
.tar-block.is-result h4 { color: var(--color-primary); }
.tar-block p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.result-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  margin-top: clamp(var(--space-8), 5vw, var(--space-10));
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
}
.result-metric {
  min-width: 140px;
}
.result-metric b {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}
.result-metric span {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

@media (max-width: 860px) {
  .tar-grid { grid-template-columns: 1fr; gap: var(--space-6); }
  .case-summary { align-items: flex-start; }
  .case-index { display: none; }
}

/* =========================================================
   CREDENTIALS / CONTACT PAGE
   ========================================================= */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: stretch;
}

.contact-card {
  background: var(--color-text);
  color: var(--color-text-inverse);
  border-radius: var(--radius-xl);
  padding: clamp(var(--space-8), 5vw, var(--space-12));
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}
[data-theme='dark'] .contact-card {
  background: var(--color-surface-offset-2);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}
.contact-card h2 {
  font-size: var(--text-xl);
  max-width: 14ch;
}
.contact-card > p {
  margin-top: var(--space-4);
  color: color-mix(in oklab, var(--color-text-inverse) 65%, transparent);
  max-width: 40ch;
}
[data-theme='dark'] .contact-card > p {
  color: var(--color-text-muted);
}

.contact-list {
  margin-top: var(--space-10);
  display: grid;
  gap: var(--space-1);
}
.contact-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
  border-top: 1px solid color-mix(in oklab, var(--color-text-inverse) 15%, transparent);
}
[data-theme='dark'] .contact-row {
  border-top-color: var(--color-border);
}
@media (max-width: 480px) {
  .contact-row {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
  }
}
.contact-row span {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: color-mix(in oklab, var(--color-text-inverse) 55%, transparent);
}
[data-theme='dark'] .contact-row span {
  color: var(--color-text-faint);
}
.contact-row a,
.contact-row strong {
  font-size: var(--text-base);
  font-weight: 600;
}
.contact-row a:hover {
  color: var(--color-primary);
}

.contact-card .btn-primary {
  margin-top: var(--space-10);
  align-self: flex-start;
}

.availability-card {
  padding: clamp(var(--space-8), 5vw, var(--space-12));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-surface);
  display: flex;
  flex-direction: column;
}
.availability-status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-success);
}
.availability-status::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--color-success);
  animation: pulse-dot 2s var(--ease-in-out) infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 color-mix(in oklab, var(--color-success) 40%, transparent); }
  50% { opacity: 0.7; box-shadow: 0 0 0 6px transparent; }
}
.availability-card h3 {
  margin-top: var(--space-4);
  font-size: var(--text-lg);
}
.availability-card p {
  margin-top: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}
.location-strip {
  margin-top: auto;
  padding-top: var(--space-8);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}
.location-strip svg {
  width: 18px;
  height: 18px;
  color: var(--color-primary);
  flex-shrink: 0;
}

@media (max-width: 860px) {
  .contact-grid { grid-template-columns: 1fr; }
}

/* Credentials grid */
.cred-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
}
.cred-card {
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  display: flex;
  gap: var(--space-4);
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive);
}
.cred-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}
.cred-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.cred-icon svg { width: 22px; height: 22px; }
.cred-card h4 {
  font-size: var(--text-base);
  font-weight: 600;
}
.cred-card p {
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

@media (max-width: 680px) {
  .cred-grid { grid-template-columns: 1fr; }
}

/* Skills marquee */
.skills-marquee {
  overflow: hidden;
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
  padding-block: var(--space-6);
}
.marquee-track {
  display: flex;
  gap: var(--space-3);
  width: max-content;
  animation: marquee 32s linear infinite;
}
@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}
.marquee-track .tag {
  background: var(--color-surface-offset);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  padding: var(--space-2) var(--space-5);
  white-space: nowrap;
}
@media (prefers-reduced-motion: reduce) {
  .marquee-track { animation: none; flex-wrap: wrap; }
}

/* Education / experience list */
.timeline-simple {
  display: grid;
  gap: var(--space-6);
}
.timeline-simple-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: var(--space-6);
  padding-block: var(--space-5);
  border-top: 1px solid var(--color-divider);
}
.timeline-simple-row span {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding-top: var(--space-1);
}
.timeline-simple-row h4 {
  font-size: var(--text-base);
  font-weight: 600;
}
.timeline-simple-row p {
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
@media (max-width: 600px) {
  .timeline-simple-row { grid-template-columns: 1fr; gap: var(--space-2); }
}

/* Utility */
.mt-0 { margin-top: 0 !important; }
.center { text-align: center; }
.two-col-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(var(--space-8), 6vw, var(--space-16));
  align-items: start;
}
@media (max-width: 860px) {
  .two-col-grid { grid-template-columns: 1fr; }
}