/* ============================================================
   ralsadrah.xyz — Portfolio Stylesheet
   Stack: Pure CSS + CSS Custom Properties
   Theme: Olive Garden — light/dark auto + manual toggle
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,700;0,900;1,700&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

/* ============================================================
   1. DESIGN TOKENS
   ============================================================ */

:root {
  /* Light mode — Olive Garden */
  --bg:           #F4F0E6;
  --surface:      #EAE4D4;
  --surface-2:    #E0D9C8;
  --text:         #25261C;
  --text-muted:   #7A7860;
  --accent:       #5C6B2E;
  --accent-hover: #4A5524;
  --border:       #D4CCBA;
  --tag-bg:       #DDD8C4;
  --tag-text:     #4A4A30;

  /* Typography */
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body:    'Inter', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', 'Courier New', monospace;

  /* Scale */
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  3rem;
  --text-6xl:  3.75rem;

  /* Spacing */
  --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;

  /* Layout */
  --max-width:    960px;
  --nav-height:   64px;
  --radius:       4px;
  --radius-lg:    8px;

  /* Transitions */
  --transition: 200ms ease;
}

/* Dark mode — applied via OS preference */
@media (prefers-color-scheme: dark) {
  :root {
    --bg:           #191A12;
    --surface:      #23241A;
    --surface-2:    #2C2D22;
    --text:         #E8E4D4;
    --text-muted:   #9A9578;
    --accent:       #8FA44A;
    --accent-hover: #A8C057;
    --border:       #35362A;
    --tag-bg:       #2E2F24;
    --tag-text:     #B5B090;
  }
}

/* Manual overrides from toggle */
[data-theme="light"] {
  --bg:           #F4F0E6;
  --surface:      #EAE4D4;
  --surface-2:    #E0D9C8;
  --text:         #25261C;
  --text-muted:   #7A7860;
  --accent:       #5C6B2E;
  --accent-hover: #4A5524;
  --border:       #D4CCBA;
  --tag-bg:       #DDD8C4;
  --tag-text:     #4A4A30;
}

[data-theme="dark"] {
  --bg:           #191A12;
  --surface:      #23241A;
  --surface-2:    #2C2D22;
  --text:         #E8E4D4;
  --text-muted:   #9A9578;
  --accent:       #8FA44A;
  --accent-hover: #A8C057;
  --border:       #35362A;
  --tag-bg:       #2E2F24;
  --tag-text:     #B5B090;
}

/* ============================================================
   2. RESET
   ============================================================ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--text);
  background-color: var(--bg);
  transition: background-color var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }
input, textarea { font: inherit; }

/* Focus ring — accessible, on-brand */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius);
}

/* Selection */
::selection {
  background-color: color-mix(in srgb, var(--accent) 25%, transparent);
  color: var(--text);
}

/* ============================================================
   3. LAYOUT
   ============================================================ */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

/* Section spacing */
.section {
  padding-block: var(--space-20);
}

.section + .section {
  border-top: 1px solid var(--border);
}

/* Editorial two-column layout (label | content) */
.editorial-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 640px) {
  .editorial-row {
    grid-template-columns: 180px 1fr;
    gap: var(--space-12);
    align-items: start;
  }
}

.editorial-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  padding-top: 4px;
}

/* ============================================================
   4. TYPOGRAPHY
   ============================================================ */

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--text);
}

h1 { font-size: var(--text-5xl); font-weight: 900; }
h2 { font-size: var(--text-3xl); font-weight: 700; }
h3 { font-size: var(--text-xl);  font-weight: 700; }
h4 { font-size: var(--text-lg);  font-weight: 700; }

p { color: var(--text); line-height: 1.75; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
}

.lead {
  font-size: var(--text-lg);
  color: var(--text-muted);
  line-height: 1.75;
  max-width: 60ch;
}

.mono { font-family: var(--font-mono); }

/* Prose — used in case studies and notes */
.prose { max-width: 68ch; }
.prose p { margin-bottom: var(--space-5); color: var(--text-muted); }
.prose p:last-child { margin-bottom: 0; }
.prose h2 { margin-top: var(--space-10); margin-bottom: var(--space-4); font-size: var(--text-2xl); }
.prose h3 { margin-top: var(--space-8); margin-bottom: var(--space-3); }
.prose ul, .prose ol { margin-bottom: var(--space-5); padding-left: var(--space-6); }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li { margin-bottom: var(--space-2); color: var(--text-muted); }
.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: var(--radius);
}
.prose strong { color: var(--text); font-weight: 600; }
.prose blockquote {
  border-left: 3px solid var(--accent);
  padding-left: var(--space-5);
  margin-left: 0;
  color: var(--text-muted);
  font-style: italic;
}

/* ============================================================
   5. HEADER & NAVIGATION
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  border-bottom: 1px solid var(--border);
  transition: background-color var(--transition);
}

.site-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background-color: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: -1;
}

.nav {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

.nav-logo {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-logo:hover { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  transition: color var(--transition);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width var(--transition);
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--accent);
}

.nav-links a:hover::after,
.nav-links a[aria-current="page"]::after {
  width: 100%;
}

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

/* Theme toggle button */
.theme-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  color: var(--text-muted);
  transition: color var(--transition), background-color var(--transition);
  flex-shrink: 0;
}

.theme-toggle:hover {
  color: var(--accent);
  background: var(--surface);
}

.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }

[data-theme="dark"]  .theme-toggle .icon-sun  { display: block; }
[data-theme="dark"]  .theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun  { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: block; }

@media (prefers-color-scheme: dark) {
  .theme-toggle .icon-sun  { display: block; }
  .theme-toggle .icon-moon { display: none; }
}

/* Mobile hamburger */
.nav-mobile-btn {
  display: none;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  color: var(--text-muted);
  transition: color var(--transition);
}

.nav-mobile-btn:hover { color: var(--accent); }

/* Mobile nav drawer */
.nav-mobile-menu {
  display: none;
  position: fixed;
  inset: var(--nav-height) 0 0 0;
  background: var(--bg);
  padding: var(--space-8) var(--space-6);
  z-index: 99;
  border-top: 1px solid var(--border);
  flex-direction: column;
  gap: var(--space-4);
}

.nav-mobile-menu.is-open { display: flex; }

.nav-mobile-menu a {
  font-size: var(--text-xl);
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  padding-bottom: var(--space-4);
  transition: color var(--transition);
}

.nav-mobile-menu a:hover { color: var(--accent); }

@media (max-width: 639px) {
  .nav-links { display: none; }
  .nav-mobile-btn { display: flex; }
}

/* ============================================================
   6. FOOTER
   ============================================================ */

.site-footer {
  border-top: 1px solid var(--border);
  padding-block: var(--space-10);
  margin-top: auto;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

@media (min-width: 640px) {
  .footer-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.footer-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
}

.footer-links {
  display: flex;
  gap: var(--space-5);
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--text-muted);
  transition: color var(--transition);
}

.footer-links a:hover { color: var(--accent); }

.footer-copy {
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ============================================================
   7. BUTTONS
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius);
  padding: 10px 20px;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover { background: var(--accent-hover); }

.btn-ghost {
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}

/* ============================================================
   8. TAGS / BADGES
   ============================================================ */

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  padding: 3px 10px;
  border-radius: var(--radius);
  background: var(--tag-bg);
  color: var(--tag-text);
  white-space: nowrap;
  line-height: 1.6;
}

.tag-accent {
  background: color-mix(in srgb, var(--accent) 15%, transparent);
  color: var(--accent);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* ============================================================
   9. HERO
   ============================================================ */

.hero {
  padding-top: calc(var(--space-20) + var(--space-8));
  padding-bottom: var(--space-20);
  border-bottom: 1px solid var(--border);
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-5);
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, var(--text-6xl));
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  max-width: 18ch;
  margin-bottom: var(--space-6);
}

.hero-title em {
  font-style: italic;
  color: var(--accent);
}

.hero-lead {
  font-size: var(--text-lg);
  color: var(--text-muted);
  line-height: 1.75;
  max-width: 55ch;
  margin-bottom: var(--space-8);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.hero-meta {
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-8);
}

.hero-meta-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.hero-meta-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.hero-meta-value {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text);
}

/* Home hero split layout */
.home-hero-split {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

@media (min-width: 700px) {
  .home-hero-split {
    flex-direction: row;
    align-items: center;
    gap: var(--space-12);
  }
}

.home-hero-text { min-width: 0; flex: 1; }

/* Portrait — circle, visible on all sizes */
.home-hero-portrait {
  display: flex;
  justify-content: center;
  order: -1; /* photo above text on mobile */
}

@media (min-width: 700px) {
  .home-hero-portrait {
    order: 0;
    flex-shrink: 0;
    justify-content: flex-end;
  }
}

.home-portrait {
  /* circle mask */
  width: 100px;
  height: 100px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center 8%; /* frame the face */
  display: block;
  border: 2px solid var(--border);
  filter: sepia(6%) contrast(1.02);
  transition: filter var(--transition), border-color var(--transition);
}

@media (min-width: 700px) {
  .home-portrait {
    width: 240px;
    height: 240px;
    border-width: 3px;
  }
}

.home-portrait:hover {
  filter: sepia(0%) contrast(1.05);
  border-color: var(--accent);
}

/* ============================================================
   10. CASE STUDY CARDS
   ============================================================ */

.work-grid {
  display: grid;
  gap: var(--space-4);
}

.case-card {
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: var(--space-4);
  padding: var(--space-8);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition), transform 200ms ease;
  position: relative;
}

.case-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.case-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-4);
}

.case-card-meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-bottom: var(--space-2);
}

.case-card h3 {
  font-size: var(--text-xl);
  line-height: 1.3;
}

.case-card-arrow {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text-muted);
  transition: border-color var(--transition), color var(--transition), transform var(--transition);
}

.case-card:hover .case-card-arrow {
  border-color: var(--accent);
  color: var(--accent);
  transform: rotate(45deg);
}

.case-card-summary {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.7;
}

.case-card-link {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
}

/* Featured card — larger on desktop */
@media (min-width: 640px) {
  .work-grid { grid-template-columns: 1fr 1fr; }
  .case-card.featured { grid-column: 1 / -1; }
  .case-card.featured h3 { font-size: var(--text-2xl); }
}

/* ============================================================
   11. TIMELINE (Experience)
   ============================================================ */

.timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 0;
  width: 1px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding-left: var(--space-8);
  padding-bottom: var(--space-8);
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-item::before {
  content: '';
  position: absolute;
  left: -4px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-1);
}

.timeline-role {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
  margin-bottom: var(--space-1);
}

.timeline-company {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--accent);
  margin-bottom: var(--space-4);
}

.timeline-bullets {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-left: var(--space-4);
  border-left: 2px solid var(--border);
}

.timeline-bullets li {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.65;
}

/* ============================================================
   12. SKILLS GRID
   ============================================================ */

.skills-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.skills-group h4 {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: var(--space-3);
}

.skills-pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.skill-pill {
  font-size: var(--text-sm);
  padding: 6px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--text);
  transition: border-color var(--transition), color var(--transition);
}

.skill-pill:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ============================================================
   13. CERTIFICATIONS
   ============================================================ */

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-3);
}

.cert-card {
  padding: var(--space-4) var(--space-5);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  transition: border-color var(--transition);
}

.cert-card:hover { border-color: var(--accent); }

.cert-name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}

.cert-issuer {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* ============================================================
   14. CONTACT — SOCIAL GRID
   ============================================================ */

.social-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

@media (min-width: 480px) {
  .social-grid { grid-template-columns: repeat(4, 1fr); }
}

.social-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-8) var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  color: var(--text-muted);
  text-decoration: none;
  transition: border-color var(--transition), color var(--transition), transform 200ms ease;
}

.social-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-3px);
}

.social-btn svg {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.social-btn-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ============================================================
   15. STRAVA / RUNNING ACTIVITIES
   ============================================================ */

.strava-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.strava-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #FC4C02;
  transition: opacity var(--transition);
}
.strava-link:hover { opacity: 0.75; }
.strava-link svg { width: 16px; height: 16px; }

.activity-grid {
  display: grid;
  gap: var(--space-3);
}

@media (min-width: 640px) {
  .activity-grid { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 960px) {
  .activity-grid { grid-template-columns: 1fr 1fr 1fr; }
}

.activity-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  text-decoration: none;
  color: inherit;
  transition: border-color var(--transition), transform 200ms ease;
}

.activity-card:hover {
  border-color: #FC4C02;
  transform: translateY(-2px);
}

.activity-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-2);
}

.activity-type-badge {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #FC4C02;
}

.activity-date {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.activity-name {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  line-height: 1.2;
}

.activity-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.activity-stat { display: flex; flex-direction: column; gap: 2px; }

.activity-stat-value {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}

.activity-stat-label {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.activity-elevation {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.activity-loading, .activity-error {
  grid-column: 1 / -1;
  padding: var(--space-12);
  text-align: center;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  border: 1px dashed var(--border);
  border-radius: var(--radius-lg);
}

/* ============================================================
   16. PAGE — HOME
   ============================================================ */

.home-featured-label {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.home-featured-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ============================================================
   15. PAGE — ABOUT
   ============================================================ */

.about-intro {
  font-size: var(--text-xl);
  line-height: 1.75;
  color: var(--text-muted);
  max-width: 65ch;
}

.about-intro strong { color: var(--text); }

/* Portrait — floated right within bio prose, text wraps naturally */
.about-bio-prose {
  overflow: hidden; /* clearfix */
}

.about-portrait-figure {
  float: right;
  margin: var(--space-1) 0 var(--space-5) var(--space-8);
  width: 136px;
}

@media (min-width: 640px) {
  .about-portrait-figure {
    width: 160px;
    margin-left: var(--space-10);
  }
}

.about-portrait {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: center top;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  display: block;
  filter: grayscale(20%);
  transition: filter var(--transition);
}

.about-portrait:hover { filter: grayscale(0%); }

/* ============================================================
   16. PAGE — RESUME
   ============================================================ */

.resume-download-bar {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-12);
}

.resume-section-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--space-8);
}

/* ============================================================
   17. PAGE — CASE STUDY DETAIL
   ============================================================ */

.case-hero {
  padding-top: var(--space-20);
  padding-bottom: var(--space-16);
  border-bottom: 1px solid var(--border);
}

.case-back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: var(--space-8);
  transition: color var(--transition);
}

.case-back:hover { color: var(--accent); }

.case-hero-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 900;
  line-height: 1.1;
  max-width: 22ch;
  margin-bottom: var(--space-6);
}

.case-meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-6);
  padding-top: var(--space-8);
  border-top: 1px solid var(--border);
  margin-top: var(--space-8);
}

.case-meta-item { display: flex; flex-direction: column; gap: var(--space-1); }

.case-meta-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.case-meta-value {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text);
}

.case-body {
  padding-block: var(--space-16);
}

.case-section {
  margin-bottom: var(--space-16);
}

.case-section-heading {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--border);
}

/* Outcome stat boxes */
.outcomes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.outcome-card {
  padding: var(--space-5) var(--space-6);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  border-left: 3px solid var(--accent);
}

.outcome-value {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 900;
  color: var(--accent);
  line-height: 1;
  margin-bottom: var(--space-1);
}

.outcome-label {
  font-size: var(--text-xs);
  color: var(--text-muted);
  line-height: 1.4;
}

/* ============================================================
   18. PAGE — NOTES
   ============================================================ */

/* LinkedIn link in hero */
.notes-linkedin-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-top: var(--space-6);
  transition: color var(--transition);
}
.notes-linkedin-link:hover { color: var(--accent); }

/* Feed */
.notes-loading,
.notes-empty {
  padding: var(--space-16) 0;
  color: var(--text-muted);
  font-size: var(--text-sm);
}

/* Note cards — stacked list, editorial style */
.note-card {
  display: block;
  text-decoration: none;
  border-top: 1px solid var(--border);
  padding: var(--space-8) 0;
  transition: background-color var(--transition);
}

.note-card:last-child { border-bottom: 1px solid var(--border); }

.note-card:hover .note-title { color: var(--accent); }
.note-card:hover .note-read-more { color: var(--accent); gap: var(--space-2); }

.note-card-inner {
  display: grid;
  gap: var(--space-3);
}

.note-meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.note-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--accent);
  letter-spacing: 0.05em;
}

.note-date {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.note-title {
  font-family: var(--font-display);
  font-size: clamp(var(--text-xl), 2.5vw, var(--text-2xl));
  font-weight: 700;
  color: var(--text);
  line-height: 1.25;
  transition: color var(--transition);
  max-width: 60ch;
}

.note-excerpt {
  font-size: var(--text-base);
  color: var(--text-muted);
  line-height: 1.65;
  max-width: 65ch;
}

.note-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

.note-read-more {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  transition: color var(--transition), gap var(--transition);
  white-space: nowrap;
}

/* ============================================================
   19. PAGE — CONTACT
   ============================================================ */

.social-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: center;
}

.social-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  width: 140px;
  height: 140px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  color: var(--text-muted);
  transition: border-color var(--transition), color var(--transition),
              background-color var(--transition), transform 200ms ease;
  text-decoration: none;
}

.social-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 6%, var(--surface));
  transform: translateY(-3px);
}

.social-btn svg {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.social-btn-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

@media (min-width: 640px) {
  .social-btn { width: 160px; height: 160px; }
}

/* ============================================================
   20. DIVIDER
   ============================================================ */

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0;
}

/* ============================================================
   21. UTILITIES
   ============================================================ */

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

.text-accent  { color: var(--accent); }
.text-muted   { color: var(--text-muted); }
.font-display { font-family: var(--font-display); }
.font-mono    { font-family: var(--font-mono); }

.mt-2  { margin-top: var(--space-2); }
.mt-4  { margin-top: var(--space-4); }
.mt-6  { margin-top: var(--space-6); }
.mt-8  { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mb-4  { margin-bottom: var(--space-4); }
.mb-6  { margin-bottom: var(--space-6); }
.mb-8  { margin-bottom: var(--space-8); }

.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }

.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }

/* ============================================================
   22. RESPONSIVE TWEAKS
   ============================================================ */

@media (max-width: 639px) {
  h1 { font-size: var(--text-4xl); }
  h2 { font-size: var(--text-2xl); }
  .hero { padding-top: var(--space-16); padding-bottom: var(--space-16); }
  .section { padding-block: var(--space-12); }
  .case-card { padding: var(--space-5); }
  .resume-download-bar { flex-direction: column; align-items: flex-start; }
}

/* ============================================================
   23. PRINT
   ============================================================ */

@media print {
  .site-header, .site-footer, .btn, .theme-toggle { display: none !important; }
  body { color: #000; background: #fff; }
  a[href]::after { content: " (" attr(href) ")"; font-size: 0.75em; color: #666; }
}

/* ============================================================
   24. ACCESSIBILITY — SKIP LINK
   ============================================================ */

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 9999;
  padding: var(--space-2) var(--space-5);
  background: var(--accent);
  color: #fff;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius);
  text-decoration: none;
  transition: top 0.15s ease;
}
.skip-link:focus { top: var(--space-3); }

/* ============================================================
   25. WRITING / ARTICLE PAGE
   ============================================================ */

.article-hero { padding-block: var(--space-20) var(--space-12); border-bottom: 1px solid var(--border); }
.article-body { padding-block: var(--space-12) var(--space-20); }
.article-body .prose { max-width: 68ch; }
.article-body .prose h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
  color: var(--text);
}
.article-body .prose h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}
.article-body .prose code {
  background: var(--surface);
  padding: 0.1em 0.4em;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.875em;
}
.article-byline {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-6);
  font-size: var(--text-sm);
  color: var(--text-muted);
}
.article-byline strong { color: var(--text); font-weight: 500; }
.article-reading-time { margin-left: auto; }
.article-back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-muted);
  text-decoration: none;
  margin-bottom: var(--space-8);
  transition: color var(--transition);
}
.article-back:hover { color: var(--accent); }

/* ============================================================
   26. ARCHITECTURE DIAGRAM — DARK MODE OVERRIDES
   The inline SVG uses hardcoded hex presentation attributes.
   CSS `fill` property overrides presentation attributes in
   all modern browsers.
   ============================================================ */

@media (prefers-color-scheme: dark) {
  .arch-svg text                        { fill: #F0ECD8; }
  .arch-svg text[fill="#7A7860"]        { fill: #C4BE9F !important; }
  .arch-svg text[fill="#4A4A30"]        { fill: #C4BE9F !important; }
  .arch-svg text[fill="#5C6B2E"]        { fill: #A8C057 !important; }
  .arch-svg text[fill="#8FA44A"]        { fill: #BACE6B !important; }
  .arch-svg rect[fill="#fff"]           { fill: #3E4228 !important; fill-opacity: 1 !important; }
  .arch-svg rect[fill-opacity="0.06"]   { fill-opacity: 0.28 !important; }
  .arch-svg rect[fill-opacity="0.08"]   { fill-opacity: 0.28 !important; }
  .arch-svg rect[fill-opacity="0.1"]    { fill-opacity: 0.25 !important; }
  .arch-svg rect[fill-opacity="0.12"]   { fill-opacity: 0.32 !important; }
  .arch-svg rect[stroke="#D4CCBA"]      { stroke: #555843 !important; }
  .arch-svg polygon                     { fill: #A8C057 !important; }
  .arch-svg polygon[fill="#8FA44A"]     { fill: #BACE6B !important; }
}

[data-theme="dark"] .arch-svg text                        { fill: #F0ECD8; }
[data-theme="dark"] .arch-svg text[fill="#7A7860"]        { fill: #C4BE9F !important; }
[data-theme="dark"] .arch-svg text[fill="#4A4A30"]        { fill: #C4BE9F !important; }
[data-theme="dark"] .arch-svg text[fill="#5C6B2E"]        { fill: #A8C057 !important; }
[data-theme="dark"] .arch-svg text[fill="#8FA44A"]        { fill: #BACE6B !important; }
[data-theme="dark"] .arch-svg rect[fill="#fff"]           { fill: #3E4228 !important; fill-opacity: 1 !important; }
[data-theme="dark"] .arch-svg rect[fill-opacity="0.06"]   { fill-opacity: 0.28 !important; }
[data-theme="dark"] .arch-svg rect[fill-opacity="0.08"]   { fill-opacity: 0.28 !important; }
[data-theme="dark"] .arch-svg rect[fill-opacity="0.1"]    { fill-opacity: 0.25 !important; }
[data-theme="dark"] .arch-svg rect[fill-opacity="0.12"]   { fill-opacity: 0.32 !important; }
[data-theme="dark"] .arch-svg rect[stroke="#D4CCBA"]      { stroke: #555843 !important; }
[data-theme="dark"] .arch-svg polygon                     { fill: #A8C057 !important; }
[data-theme="dark"] .arch-svg polygon[fill="#8FA44A"]     { fill: #BACE6B !important; }

/* ── Explicit LIGHT MODE reset ─────────────────────────────────────────────
   Cancels the @media dark rules above when the user manually toggles to
   light theme while the OS is still in dark mode.                         */
[data-theme="light"] .arch-svg text                        { fill: #25261C !important; }
[data-theme="light"] .arch-svg text[fill="#7A7860"]        { fill: #7A7860 !important; }
[data-theme="light"] .arch-svg text[fill="#4A4A30"]        { fill: #4A4A30 !important; }
[data-theme="light"] .arch-svg text[fill="#5C6B2E"]        { fill: #5C6B2E !important; }
[data-theme="light"] .arch-svg text[fill="#8FA44A"]        { fill: #8FA44A !important; }
[data-theme="light"] .arch-svg rect[fill="#fff"]           { fill: #fff !important; fill-opacity: 0.6 !important; }
[data-theme="light"] .arch-svg rect[fill-opacity="0.06"]   { fill-opacity: 0.06 !important; }
[data-theme="light"] .arch-svg rect[fill-opacity="0.08"]   { fill-opacity: 0.08 !important; }
[data-theme="light"] .arch-svg rect[fill-opacity="0.1"]    { fill-opacity: 0.1  !important; }
[data-theme="light"] .arch-svg rect[fill-opacity="0.12"]   { fill-opacity: 0.12 !important; }
[data-theme="light"] .arch-svg rect[stroke="#D4CCBA"]      { stroke: #D4CCBA !important; }
[data-theme="light"] .arch-svg polygon                     { fill: #5C6B2E !important; }
[data-theme="light"] .arch-svg polygon[fill="#8FA44A"]     { fill: #8FA44A !important; }