/* =============================================================
   Tio Aldino · Portfolio design system
   -------------------------------------------------------------
   Layout concept: a quiet, engineering-grade letterhead. Left-aligned
   content on a 1200px measure, hairline borders instead of glass,
   one accent, tabular figures wherever numbers line up.
   ============================================================= */

/* ==== 0. Tokens ============================================ */
:root {
  color-scheme: light;

  /* Surfaces */
  --bg: #fbfbfc;
  --surface: #ffffff;
  --surface-2: #f3f5f8;
  --surface-sunken: #eef1f5;
  --border: #e3e7ed;
  --border-strong: #c9d1dc;

  /* Ink */
  --text: #0e1726;
  --text-2: #3f4b5c;
  --text-3: #66717f;
  --text-inverse: #ffffff;

  /* Accent (ledger blue) */
  --accent: #2457c5;
  --accent-strong: #1b459e;
  --accent-soft: rgba(36, 87, 197, 0.08);
  --accent-ring: rgba(36, 87, 197, 0.35);

  /* Semantic hues (muted, used sparingly) */
  --ok: #1e7f4f;
  --ok-soft: rgba(30, 127, 79, 0.1);
  --warn: #9a6b00;
  --warn-soft: rgba(154, 107, 0, 0.1);
  --danger: #b83232;
  --danger-soft: rgba(184, 50, 50, 0.1);
  --color-purple: #5d4fc4;
  --color-green: var(--ok);
  --color-yellow: var(--warn);
  --color-red: var(--danger);
  --color-orange: #b65c1e;
  --color-pink: #b0397a;

  /* Typography */
  --font-display: 'Manrope', 'IBM Plex Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-body: 'IBM Plex Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --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;
  --fs-h1: clamp(2.5rem, 1.4rem + 4.2vw, 4.25rem);
  --fs-h2: clamp(1.75rem, 1.2rem + 1.8vw, 2.375rem);
  --fs-h3: clamp(1.2rem, 1.05rem + 0.5vw, 1.4rem);

  /* Spacing (8pt scale; names shared with the MSc pages) */
  --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;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* Elevation */
  --shadow-sm: 0 1px 2px rgba(14, 23, 38, 0.05);
  --shadow-md: 0 4px 14px -4px rgba(14, 23, 38, 0.1);
  --shadow-lg: 0 18px 36px -16px rgba(14, 23, 38, 0.18);
  --shadow-xl: var(--shadow-lg);
  --shadow-glow: var(--shadow-lg);
  --shadow-glow-purple: var(--shadow-lg);

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-spring: var(--ease-out);
  --dur-fast: 150ms;
  --dur-base: 250ms;
  --dur-slow: 450ms;
  --transition-base: all var(--dur-base) var(--ease-out);

  /* Layout */
  --nav-height: 64px;
  --container-max: 1200px;
  --container-narrow: 760px;
  --gutter: 1.25rem;

  /* Hero grid texture */
  --grid-line: rgba(14, 23, 38, 0.07);

  /* ---- Compatibility aliases (consumed by the MSc module pages) ---- */
  --color-primary: var(--bg);
  --color-primary-light: var(--surface-2);
  --color-primary-lighter: var(--border);
  --color-secondary: var(--accent);
  --color-secondary-deep: var(--accent-strong);
  --color-accent: var(--accent);
  --color-accent-alt: var(--color-orange);
  --color-success: var(--ok);
  --color-warning: var(--warn);
  --color-danger: var(--danger);
  --color-white: var(--text);
  --color-gray-100: var(--text);
  --color-gray-200: var(--text);
  --color-gray-300: var(--text-2);
  --color-gray-400: var(--text-3);
  --color-gray-500: var(--text-3);
  --color-gray-600: var(--border-strong);
  --color-gray-700: var(--border);
  --color-gray-800: var(--surface-2);
  --color-gray-900: var(--bg);
  --color-text-primary: var(--text);
  --color-text-secondary: var(--text-2);
  --color-bg-primary: var(--bg);
  --color-bg-secondary: var(--surface);
  --color-bg-tertiary: var(--surface-2);
  --glass-bg: var(--surface);
  --glass-bg-strong: var(--surface-2);
  --glass-border: var(--border);
  --glass-border-strong: var(--border-strong);
  --gradient-primary: linear-gradient(135deg, var(--accent), var(--accent-strong));
  --gradient-cool: var(--gradient-primary);
  --gradient-warm: linear-gradient(135deg, var(--color-orange), var(--color-pink));
  --gradient-card: var(--surface);
  --gradient-mesh: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #0b0f17;
    --surface: #111722;
    --surface-2: #171f2c;
    --surface-sunken: #0d121b;
    --border: #232d3c;
    --border-strong: #35425a;
    --text: #e8ecf2;
    --text-2: #aab4c3;
    --text-3: #7f8a9b;
    --text-inverse: #0b0f17;
    --accent: #7fa7f0;
    --accent-strong: #a6c2f5;
    --accent-soft: rgba(127, 167, 240, 0.12);
    --accent-ring: rgba(127, 167, 240, 0.45);
    --ok: #5bc98a;
    --ok-soft: rgba(91, 201, 138, 0.12);
    --warn: #e0b64c;
    --warn-soft: rgba(224, 182, 76, 0.12);
    --danger: #f08080;
    --danger-soft: rgba(240, 128, 128, 0.12);
    --color-purple: #a79bf0;
    --color-orange: #f0a070;
    --color-pink: #e58ab8;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 14px -4px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 18px 36px -16px rgba(0, 0, 0, 0.6);
    --grid-line: rgba(232, 236, 242, 0.06);
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b0f17;
  --surface: #111722;
  --surface-2: #171f2c;
  --surface-sunken: #0d121b;
  --border: #232d3c;
  --border-strong: #35425a;
  --text: #e8ecf2;
  --text-2: #aab4c3;
  --text-3: #7f8a9b;
  --text-inverse: #0b0f17;
  --accent: #7fa7f0;
  --accent-strong: #a6c2f5;
  --accent-soft: rgba(127, 167, 240, 0.12);
  --accent-ring: rgba(127, 167, 240, 0.45);
  --ok: #5bc98a;
  --ok-soft: rgba(91, 201, 138, 0.12);
  --warn: #e0b64c;
  --warn-soft: rgba(224, 182, 76, 0.12);
  --danger: #f08080;
  --danger-soft: rgba(240, 128, 128, 0.12);
  --color-purple: #a79bf0;
  --color-orange: #f0a070;
  --color-pink: #e58ab8;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 14px -4px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 18px 36px -16px rgba(0, 0, 0, 0.6);
  --grid-line: rgba(232, 236, 242, 0.06);
}

/* ==== 1. Reset & base ====================================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 1rem);
  -webkit-text-size-adjust: 100%;
}
body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; transition: color var(--dur-fast) var(--ease-out); }
img, svg { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
strong { font-weight: 600; color: var(--text); }
::selection { background: var(--accent); color: var(--text-inverse); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
[id] { scroll-margin-top: calc(var(--nav-height) + 1rem); }

.skip-link {
  position: absolute;
  left: 1rem; top: -4rem;
  z-index: 2000;
  padding: 0.6rem 1rem;
  background: var(--accent);
  color: var(--text-inverse);
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: top var(--dur-fast) var(--ease-out);
}
.skip-link:focus { top: 1rem; }

.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;
}

/* ==== 2. Typography ======================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--text);
  text-wrap: balance;
}
h1 { font-size: var(--fs-h1); letter-spacing: -0.03em; line-height: 1.02; }
h2 { font-size: var(--fs-h2); letter-spacing: -0.02em; }
h3 { font-size: var(--fs-h3); }
h4 { font-size: var(--text-base); }
p { color: var(--text-2); }
p + p { margin-top: 1em; }
.lead { font-size: var(--text-lg); line-height: 1.6; color: var(--text-2); max-width: 62ch; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}
.eyebrow::before {
  content: '';
  width: 1.25rem; height: 1px;
  background: currentColor;
  opacity: 0.7;
}
.mono, .font-mono { font-family: var(--font-mono); }
.tnum { font-variant-numeric: tabular-nums; }
.text-gradient { color: var(--accent); }
.text-shimmer { color: var(--text-3); }
.prose { max-width: var(--container-narrow); }
.prose p { margin-bottom: 1em; }
.prose p:last-child { margin-bottom: 0; }

/* ==== 3. Layout ============================================ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
@media (min-width: 768px) { .container { padding-inline: 2rem; } }
@media (min-width: 1200px) { .container { padding-inline: 2.5rem; } }
.container-narrow { max-width: var(--container-narrow); }

.section { padding-block: var(--space-16); }
.section-sm { padding-block: var(--space-10); }
.section-lg { padding-block: var(--space-24); }
.section + .section { border-top: 1px solid var(--border); }
.section-muted { background: var(--surface-2); }
@media (min-width: 1024px) {
  .section { padding-block: var(--space-20); }
}

.section-header { margin-bottom: var(--space-10); max-width: 62ch; }
.section-header.center { margin-inline: auto; text-align: center; }
.section-header.center .eyebrow { justify-content: center; }
.section-header .section-title { margin-top: var(--space-3); }
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}
.section-title { font-weight: 700; }
.section-subtitle { margin-top: var(--space-3); color: var(--text-2); font-size: var(--text-lg); }
.section-head-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-6);
  flex-wrap: wrap;
  margin-bottom: var(--space-8);
}
.section-head-row .section-header { margin-bottom: 0; }

/* ==== 4. Header & navigation =============================== */
.site-header,
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
}
@supports not (background: color-mix(in srgb, red 50%, transparent)) {
  .site-header, .navbar { background: var(--bg); }
}
.site-header.scrolled,
.navbar.scrolled { border-bottom-color: var(--border); box-shadow: var(--shadow-sm); }
.site-header .container,
.navbar .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand, .nav-logo {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  min-height: 44px;
  color: var(--text);
}
.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 30px; height: 30px;
  border-radius: 8px;
  background: var(--text);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.brand-text, .logo-text {
  white-space: nowrap;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}
.brand-sub {
  display: none;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-3);
  letter-spacing: 0.04em;
}
@media (min-width: 1280px) { .brand-sub { display: inline; } }
.logo-dot { display: none; }

.nav-menu {
  display: none;
  align-items: center;
  gap: 0.125rem;
}
@media (min-width: 1024px) { .nav-menu { display: flex; } }
.nav-link {
  white-space: nowrap;
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 0.85rem;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-2);
  border-radius: var(--radius-md);
  transition: color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}
.nav-link:hover { color: var(--text); background: var(--surface-2); }
.nav-link.active { color: var(--text); font-weight: 600; }
.nav-link.active::after {
  content: '';
  position: absolute;
  left: 0.85rem; right: 0.85rem; bottom: 4px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
}

.nav-actions { display: flex; align-items: center; gap: 0.5rem; }
.nav-actions .nav-cta { display: none; }
@media (min-width: 1024px) { .nav-actions .nav-cta { display: inline-flex; } }

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 44px; height: 44px;
  border-radius: var(--radius-md);
  color: var(--text-2);
  border: 1px solid transparent;
  transition: color var(--dur-fast), background var(--dur-fast), border-color var(--dur-fast);
}
.icon-btn:hover { color: var(--text); background: var(--surface-2); border-color: var(--border); }
.theme-toggle .icon-sun, .theme-toggle .icon-moon { width: 18px; height: 18px; }
.theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
}

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px; height: 44px;
  padding: 0 11px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface);
}
@media (min-width: 1024px) { .nav-toggle { display: none; } }
.nav-toggle span {
  display: block;
  width: 20px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-base) var(--ease-out);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  position: fixed;
  top: var(--nav-height);
  left: 0; right: 0;
  z-index: 999;
  max-height: calc(100vh - var(--nav-height));
  max-height: calc(100dvh - var(--nav-height));
  overflow-y: auto;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out), visibility 0s linear var(--dur-base);
}
.mobile-menu.active { opacity: 1; visibility: visible; transform: translateY(0); transition-delay: 0s; }
@media (min-width: 1024px) { .mobile-menu { display: none; } }
.mobile-menu-content {
  display: flex;
  flex-direction: column;
  padding: var(--space-3) var(--gutter) var(--space-6);
  max-width: var(--container-max);
  margin-inline: auto;
}
.mobile-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 52px;
  padding: 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text);
  border-bottom: 1px solid var(--border);
}
.mobile-link:last-of-type { border-bottom: none; }
.mobile-link.active { color: var(--accent); }
.mobile-link.active::after { content: '→'; font-family: var(--font-mono); font-size: 0.9rem; }
.mobile-menu-footer {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-top: var(--space-4);
}
body.menu-open { overflow: hidden; }

/* ==== 5. Buttons =========================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.65rem 1.15rem;
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  white-space: nowrap;
  transition: background var(--dur-fast) var(--ease-out), color var(--dur-fast), border-color var(--dur-fast), box-shadow var(--dur-fast), transform var(--dur-fast);
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: var(--text-inverse); }
.btn-primary:hover { background: var(--accent-strong); box-shadow: var(--shadow-md); }
.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border-strong);
}
.btn-secondary:hover { border-color: var(--text-3); background: var(--surface-2); }
.btn-ghost { color: var(--accent); padding-inline: 0.85rem; }
.btn-ghost:hover { color: var(--accent-strong); background: var(--accent-soft); }
.btn-sm { min-height: 36px; padding: 0.4rem 0.85rem; font-size: var(--text-xs); }
.btn-lg { min-height: 50px; padding: 0.85rem 1.5rem; font-size: var(--text-base); }
.btn i, .btn svg { font-size: 0.95em; }
.btn .arrow { transition: transform var(--dur-fast) var(--ease-out); }
.btn:hover .arrow { transform: translateX(3px); }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  min-height: 44px;
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--accent);
}
.link-arrow i, .link-arrow .arrow { transition: transform var(--dur-fast) var(--ease-out); }
.link-arrow:hover { color: var(--accent-strong); }
.link-arrow:hover i, .link-arrow:hover .arrow { transform: translateX(3px); }

/* ==== 6. Cards ============================================= */
.card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: border-color var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
}
.card.is-link:hover, a.card:hover { border-color: var(--border-strong); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card-highlight { background: var(--surface); border-color: var(--border-strong); }
.card-icon {
  display: inline-grid;
  place-items: center;
  width: 40px; height: 40px;
  border-radius: var(--radius-md);
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 1rem;
  margin-bottom: var(--space-4);
}
.card-icon-alt, .card-icon-success { background: var(--surface-2); color: var(--text-2); }
.card-title { font-size: var(--text-lg); margin-bottom: 0.35rem; }
.card-subtitle { font-size: var(--text-sm); color: var(--text-3); }
.card-content { color: var(--text-2); }
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: var(--space-4);
  min-height: 44px;
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--accent);
}
.card-link i { transition: transform var(--dur-fast) var(--ease-out); }
.card-link:hover { color: var(--accent-strong); }
.card-link:hover i { transform: translateX(3px); }

/* ==== 7. Chips & badges ==================================== */
.chip, .badge, .tech-item, .achievement-tag, .edu-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.28rem 0.6rem;
  font-size: var(--text-xs);
  font-weight: 500;
  line-height: 1.3;
  color: var(--text-2);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}
.chip-mono { font-family: var(--font-mono); letter-spacing: 0.01em; }
.chip-accent, .badge-accent, .badge-purple, .badge-success, .badge-warning, .badge-danger {
  background: var(--accent-soft);
  border-color: transparent;
  color: var(--accent);
}
.badge-success { background: var(--ok-soft); color: var(--ok); }
.badge-warning { background: var(--warn-soft); color: var(--warn); }
.badge-danger { background: var(--danger-soft); color: var(--danger); }
.chip-list, .tech-stack, .achievement-tags, .edu-tags, .project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.tech-item i { color: var(--accent); }

.status {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.6rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.03em;
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-2);
  white-space: nowrap;
}
.status::before { content: ''; width: 7px; height: 7px; border-radius: 50%; background: var(--text-3); }
.status-ok { color: var(--ok); border-color: var(--ok-soft); background: var(--ok-soft); }
.status-ok::before { background: var(--ok); }
.status-dev { color: var(--warn); border-color: var(--warn-soft); background: var(--warn-soft); }
.status-dev::before { background: var(--warn); }
.status-accent { color: var(--accent); border-color: var(--accent-soft); background: var(--accent-soft); }
.status-accent::before { background: var(--accent); }

/* ==== 8. Hero ============================================== */
.hero {
  position: relative;
  padding-block: var(--space-12) var(--space-16);
  overflow: hidden;
}
@media (min-width: 1024px) { .hero { padding-block: var(--space-20) var(--space-20); } }
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(ellipse 70% 80% at 80% 30%, #000 20%, transparent 75%);
  mask-image: radial-gradient(ellipse 70% 80% at 80% 30%, #000 20%, transparent 75%);
  pointer-events: none;
}
.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  align-items: center;
}
@media (min-width: 1024px) {
  .hero-grid { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: var(--space-16); }
}
.hero-grid { grid-template-columns: minmax(0, 1fr); }
.hero-grid > * { min-width: 0; }
.hero-text { max-width: 640px; min-width: 0; }
.hero-text .eyebrow { margin-bottom: var(--space-5); }
.hero-name { display: block; }
.hero-title {
  display: block;
  margin-top: var(--space-4);
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 1rem + 1.4vw, 1.9rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.25;
  color: var(--text-2);
}
.hero-triad {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0;
  margin-top: var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-3);
}
.hero-triad li:not(:last-child)::after { content: '·'; margin-inline: 0.6rem; color: var(--border-strong); }
.hero-lede { margin-top: var(--space-6); font-size: var(--text-lg); max-width: 56ch; }
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: var(--space-8);
}
.hero-location {
  margin-top: var(--space-6);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--text-3);
}

.hero-visual {
  position: relative;
  width: 100%;
  max-width: 520px;
  margin-inline: auto;
  min-width: 0;
}
.hero-visual svg { width: 100%; height: auto; display: block; }
.hero-visual .edge { stroke: var(--border-strong); stroke-width: 1.2; fill: none; }
.hero-visual .edge-accent { stroke: var(--accent); stroke-width: 1.4; fill: none; stroke-dasharray: 4 6; }
.hero-visual .node { fill: var(--surface); stroke: var(--border-strong); stroke-width: 1.2; }
.hero-visual .node-accent { fill: var(--accent); stroke: var(--accent); }
.hero-visual .node-core { fill: var(--text); stroke: var(--text); }
.hero-visual .label { font-family: var(--font-mono); font-size: 9px; fill: var(--text-3); letter-spacing: 0.08em; }
.hero-visual .label-strong { fill: var(--text); font-weight: 500; }
.hero-visual .panel { fill: var(--surface); stroke: var(--border); stroke-width: 1; }
.hero-visual .bar { fill: var(--accent); opacity: 0.85; }
.hero-visual .bar-muted { fill: var(--border-strong); }
.hero-visual .rule { stroke: var(--border); stroke-width: 1; }
.hero-visual .tick { stroke: var(--ok); stroke-width: 1.6; fill: none; stroke-linecap: round; stroke-linejoin: round; }
@media (prefers-reduced-motion: no-preference) {
  .hero-visual .edge-accent { animation: flow 2.8s linear infinite; }
}
@keyframes flow { to { stroke-dashoffset: -20; } }

/* Fact strip (at-a-glance figures) */
.facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin-top: var(--space-12);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  background: var(--surface);
  overflow: hidden;
}
@media (min-width: 768px) { .facts { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.fact {
  padding: var(--space-5) var(--space-6);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  min-width: 0;
}
.fact:nth-child(2n) { border-right: none; }
.fact:nth-last-child(-n+2) { border-bottom: none; }
@media (min-width: 768px) {
  .fact:nth-child(2n) { border-right: 1px solid var(--border); }
  .fact:last-child { border-right: none; }
  .fact { border-bottom: none; }
}
.fact-value {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 1.2rem + 1.2vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}
.fact-label { margin-top: 0.3rem; font-size: var(--text-sm); color: var(--text-3); }

/* ==== 9. Career track (progression) ======================== */
.track {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  counter-reset: stage;
}
@media (min-width: 768px) { .track-horizontal { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--space-3); } }
.track-stage {
  position: relative;
  padding: var(--space-4) var(--space-4) var(--space-4) var(--space-5);
  border-left: 2px solid var(--border-strong);
  min-width: 0;
}
.track-stage::before {
  content: '';
  position: absolute;
  left: -6px; top: 1.2rem;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--border-strong);
}
.track-stage.current { border-left-color: var(--accent); }
.track-stage.current::before { background: var(--accent); border-color: var(--accent); }
@media (min-width: 768px) {
  .track-horizontal .track-stage { padding: var(--space-5) var(--space-3) 0 0; border-left: none; border-top: 2px solid var(--border-strong); }
  .track-horizontal .track-stage::before { left: 0; top: -6px; }
  .track-horizontal .track-stage.current { border-left: none; border-top-color: var(--accent); }
}
.track-period { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--text-3); letter-spacing: 0.04em; }
.track-name { margin-top: 0.3rem; font-family: var(--font-display); font-weight: 700; font-size: var(--text-base); color: var(--text); }
.track-note { margin-top: 0.25rem; font-size: var(--text-sm); color: var(--text-2); }

/* ==== 10. Domain grid ====================================== */
.domain-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
@media (min-width: 640px) { .domain-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1024px) { .domain-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.domain-card { display: flex; flex-direction: column; gap: var(--space-3); min-width: 0; }
.domain-card .card-title { margin-bottom: 0; }
.domain-card p { font-size: var(--text-sm); }
.domain-card .chip-list { margin-top: auto; padding-top: var(--space-2); }

/* ==== 11. Timeline (experience) ============================ */
.timeline { display: flex; flex-direction: column; gap: var(--space-6); }
.timeline-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2) var(--space-8);
  position: relative;
}
@media (min-width: 900px) { .timeline-item { grid-template-columns: 200px minmax(0, 1fr); } }
.timeline-period {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-3);
  letter-spacing: 0.02em;
  padding-top: var(--space-6);
}
.timeline-period strong { display: block; color: var(--text); font-weight: 500; }
.timeline-period .where { display: block; margin-top: 0.4rem; font-size: var(--text-xs); }
.timeline-card { min-width: 0; }
.timeline-card.current { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent) inset; }
.role-head { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem var(--space-3); margin-bottom: var(--space-2); }
.role-title { font-size: var(--text-xl); margin: 0; }
.role-org { font-size: var(--text-sm); color: var(--text-2); margin-bottom: var(--space-4); }
.role-org strong { font-weight: 600; }
.role-meta { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: var(--space-4); }
.role-summary { margin-bottom: var(--space-4); }
.bullets { display: flex; flex-direction: column; gap: 0.5rem; }
.bullets li {
  position: relative;
  padding-left: 1.25rem;
  color: var(--text-2);
  font-size: var(--text-sm);
  line-height: 1.6;
}
.bullets li::before {
  content: '';
  position: absolute;
  left: 0; top: 0.68em;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.8;
}
.job-highlights li { position: relative; padding-left: 1.25rem; color: var(--text-2); font-size: var(--text-sm); line-height: 1.6; margin-bottom: 0.5rem; }
.job-highlights li::before { content: ''; position: absolute; left: 0; top: 0.68em; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); opacity: 0.8; }
.role-scope { margin-top: var(--space-5); padding-top: var(--space-4); border-top: 1px solid var(--border); }
.role-scope-label { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-3); margin-bottom: 0.5rem; }

/* ==== 12. Case studies (projects) ========================== */
.case-group { margin-bottom: var(--space-16); }
.case-group:last-child { margin-bottom: 0; }
.case-group-head { margin-bottom: var(--space-6); display: flex; flex-wrap: wrap; align-items: baseline; gap: var(--space-3); }
.case-group-head h2 { font-size: var(--text-2xl); }
.case-group-head p { font-size: var(--text-sm); color: var(--text-3); }
.case-list { display: flex; flex-direction: column; gap: var(--space-5); }
.case {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
}
.case-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-4);
  align-items: start;
  padding: var(--space-6);
}
.case-icon {
  display: grid;
  place-items: center;
  width: 44px; height: 44px;
  border-radius: var(--radius-md);
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 1.05rem;
}
.case-title { font-size: var(--text-xl); margin-bottom: 0.4rem; }
.case-meta { display: flex; flex-wrap: wrap; gap: 0.35rem 1rem; font-family: var(--font-mono); font-size: var(--text-xs); color: var(--text-3); letter-spacing: 0.02em; }
.case-meta span::before { content: ''; }
.case-meta i { color: var(--accent); margin-right: 0.3rem; }
.case-grid {
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--border);
}
@media (min-width: 768px) { .case-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1100px) { .case-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.case-cell { padding: var(--space-5) var(--space-6); border-top: 1px solid var(--border); min-width: 0; }
.case-cell:first-child { border-top: none; }
@media (min-width: 768px) {
  .case-cell { border-top: none; border-left: 1px solid var(--border); }
  .case-cell:nth-child(2n+1) { border-left: none; }
  .case-cell:nth-child(n+3) { border-top: 1px solid var(--border); }
}
@media (min-width: 1100px) {
  .case-cell:nth-child(n+3) { border-top: none; }
  .case-cell:nth-child(2n+1) { border-left: 1px solid var(--border); }
  .case-cell:first-child { border-left: none; }
}
.case-cell.wide { grid-column: 1 / -1; border-left: none; border-top: 1px solid var(--border); }
.case-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 0.5rem;
}
.case-cell p { font-size: var(--text-sm); color: var(--text-2); }
.case-cell .chip-list { margin-top: 0.25rem; }
.case-outcome p { color: var(--text); }
.case-foot { padding: var(--space-4) var(--space-6); border-top: 1px solid var(--border); background: var(--surface-2); }

/* ==== 13. Repositories (engineering portfolio) ============= */
.repo-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
@media (min-width: 640px) { .repo-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1024px) { .repo-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.repo { display: flex; flex-direction: column; gap: var(--space-3); min-width: 0; }
.repo-head { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); }
.repo-name {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text);
  min-width: 0;
  overflow-wrap: anywhere;
}
.repo-name i { color: var(--text-3); }
.repo p { font-size: var(--text-sm); }
.repo-foot { margin-top: auto; padding-top: var(--space-2); display: flex; justify-content: space-between; align-items: center; gap: var(--space-3); flex-wrap: wrap; }
.repo-foot .chip-list { gap: 0.3rem; }

/* ==== 14. Skills =========================================== */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
@media (min-width: 768px) { .skills-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1200px) { .skills-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.skill-group { display: flex; flex-direction: column; gap: var(--space-3); min-width: 0; }
.skill-group-head { display: flex; align-items: center; gap: var(--space-3); }
.skill-group-head .card-icon { margin-bottom: 0; }
.skill-group h3 { font-size: var(--text-lg); }
.skill-group .where { font-size: var(--text-sm); color: var(--text-3); }
.skill-list { display: flex; flex-wrap: wrap; gap: 0.4rem; padding-top: var(--space-1); }
.skill-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.65rem;
  font-size: var(--text-sm);
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.skill-chip.core { background: var(--surface); border-color: var(--border-strong); font-weight: 500; }
.skill-chip.certified::after {
  content: 'certified';
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ok);
  padding-left: 0.25rem;
  border-left: 1px solid var(--border);
  margin-left: 0.15rem;
}
.legend { display: flex; flex-wrap: wrap; gap: var(--space-4); font-size: var(--text-xs); color: var(--text-3); font-family: var(--font-mono); }
.legend span { display: inline-flex; align-items: center; gap: 0.4rem; }
.legend .sw { width: 14px; height: 14px; border-radius: 3px; border: 1px solid var(--border); background: var(--surface-2); }
.legend .sw.core { background: var(--surface); border-color: var(--border-strong); }

/* ==== 15. Education & certifications ======================= */
.edu-grid { display: grid; grid-template-columns: 1fr; gap: var(--space-4); }
@media (min-width: 900px) { .edu-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.edu-card { display: flex; flex-direction: column; gap: var(--space-4); min-width: 0; }
.edu-head { display: flex; gap: var(--space-4); align-items: flex-start; }
.edu-head .card-icon { margin-bottom: 0; flex-shrink: 0; }
.edu-degree { font-size: var(--text-xl); margin-bottom: 0.2rem; }
.edu-school { font-size: var(--text-sm); color: var(--text-2); }
.edu-date { display: block; margin-top: 0.25rem; font-family: var(--font-mono); font-size: var(--text-xs); color: var(--text-3); }
.edu-highlights li { position: relative; padding-left: 1.25rem; color: var(--text-2); font-size: var(--text-sm); margin-bottom: 0.4rem; }
.edu-highlights li::before { content: ''; position: absolute; left: 0; top: 0.68em; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); opacity: 0.8; }

.cert-list { display: grid; grid-template-columns: 1fr; gap: var(--space-3); }
@media (min-width: 640px) { .cert-list { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1024px) { .cert-list { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.cert {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-4);
  align-items: start;
  padding: var(--space-4) var(--space-5);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  min-width: 0;
}
.cert-issuer {
  display: inline-grid;
  place-items: center;
  width: 44px; height: 44px;
  border-radius: var(--radius-md);
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--text-2);
}
.cert h3, .cert h4 { font-size: var(--text-base); font-weight: 600; margin-bottom: 0.2rem; text-wrap: pretty; }
.cert p { font-size: var(--text-xs); color: var(--text-3); font-family: var(--font-mono); letter-spacing: 0.02em; }
.cert-list.compact .cert { padding: var(--space-3) var(--space-4); }

/* ==== 16. Inner-page header ================================ */
.page-header {
  position: relative;
  padding-block: var(--space-12) var(--space-8);
  border-bottom: 1px solid var(--border);
}
@media (min-width: 1024px) { .page-header { padding-block: var(--space-16) var(--space-10); } }
.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(ellipse 60% 100% at 90% 0%, #000 10%, transparent 70%);
  mask-image: radial-gradient(ellipse 60% 100% at 90% 0%, #000 10%, transparent 70%);
  pointer-events: none;
}
.page-header .container { position: relative; }
.page-header .eyebrow { margin-bottom: var(--space-4); }
.page-title { font-size: clamp(2.1rem, 1.4rem + 2.6vw, 3.25rem); letter-spacing: -0.025em; margin-bottom: var(--space-4); }
.page-description { font-size: var(--text-lg); color: var(--text-2); max-width: 62ch; }
.page-header-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: var(--space-6); }
.hero-blobs, .blob { display: none; }

/* ==== 17. Sub-navigation (Data Science) ==================== */
.subnav {
  display: flex;
  gap: 0.25rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  margin-bottom: var(--space-8);
  padding-bottom: 2px;
  border-bottom: 1px solid var(--border);
}
.subnav::-webkit-scrollbar { display: none; }
.subnav a {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 0.85rem;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-2);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color var(--dur-fast), border-color var(--dur-fast);
}
.subnav a:hover { color: var(--text); }
.subnav a.active { color: var(--text); font-weight: 600; border-bottom-color: var(--accent); }

/* ==== 18. Stats (compat) =================================== */
.stats-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-3); }
.stat-item, .stat-card {
  padding: var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-align: left;
}
.stat-value, .stat-card-value {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}
.stat-label, .stat-card-label { font-size: var(--text-xs); color: var(--text-3); margin-top: 0.2rem; }

/* ==== 19. Footer =========================================== */
.footer {
  margin-top: var(--space-20);
  padding-block: var(--space-12) var(--space-8);
  border-top: 1px solid var(--border);
  background: var(--surface-2);
}
.footer-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-10);
}
@media (min-width: 768px) { .footer-content { grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--space-6); } }
.footer-brand {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
}
.footer-brand .logo-text { font-size: inherit; }
.footer-brand p { font-size: var(--text-sm); font-weight: 400; font-family: var(--font-body); }
.footer-tagline { font-size: var(--text-sm); color: var(--text-3); max-width: 38ch; }
.footer h4, .footer .footer-heading {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: var(--space-4);
}
.footer-links { display: flex; flex-direction: column; gap: 0.25rem; }
.footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  font-size: var(--text-sm);
  color: var(--text-2);
}
.footer-links a:hover { color: var(--accent); }
.footer-social { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.footer-social a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0 0.9rem;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-2);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: color var(--dur-fast), border-color var(--dur-fast);
}
.footer-social a:hover { color: var(--text); border-color: var(--border-strong); }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-3);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border);
  font-size: var(--text-xs);
  color: var(--text-3);
  font-family: var(--font-mono);
}
.footer-bottom p { color: inherit; font-size: inherit; }

/* ==== 20. Utilities ======================================== */
.text-center { text-align: center; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.max-w-2xl { max-width: 42rem; }
.text-secondary { color: var(--accent); }
.text-accent { color: var(--color-orange); }
.text-success { color: var(--ok); }
.text-muted { color: var(--text-3); }
.divider { border: none; border-top: 1px solid var(--border); margin-block: var(--space-8); }

/* Two-column "aside" layout used on home summary */
.split {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: start;
}
@media (min-width: 1024px) { .split { grid-template-columns: minmax(0, 3fr) minmax(0, 2fr); gap: var(--space-16); } }
.aside-list { display: flex; flex-direction: column; gap: var(--space-3); }
.aside-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-3);
  padding: var(--space-4) 0;
  border-top: 1px solid var(--border);
}
.aside-item:last-child { border-bottom: 1px solid var(--border); }
.aside-item i { color: var(--accent); margin-top: 0.2rem; }
.aside-item h4 { font-size: var(--text-sm); font-weight: 600; margin-bottom: 0.15rem; }
.aside-item p { font-size: var(--text-sm); }

/* Callout */
.callout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: center;
  padding: var(--space-8);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-2xl);
}
@media (min-width: 900px) { .callout { grid-template-columns: minmax(0, 1fr) auto; } }
.callout h2, .callout h3 { font-size: var(--text-2xl); margin-bottom: 0.5rem; }
.callout p { max-width: 60ch; }
.callout-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; }

/* ==== 21. Motion =========================================== */
.js [data-reveal]:not(.visible) {
  opacity: 0;
  transform: translateY(12px);
}
[data-reveal] { transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out); }
[data-reveal].visible { opacity: 1; transform: none; }
[data-reveal-delay="1"].visible { transition-delay: 60ms; }
[data-reveal-delay="2"].visible { transition-delay: 120ms; }
[data-reveal-delay="3"].visible { transition-delay: 180ms; }
[data-reveal-delay="4"].visible { transition-delay: 240ms; }
[data-reveal-delay="5"].visible { transition-delay: 300ms; }
[data-reveal-delay="6"].visible { transition-delay: 360ms; }
[data-reveal-delay="7"].visible { transition-delay: 420ms; }
[data-reveal-delay="8"].visible { transition-delay: 480ms; }
@keyframes pulse-fade { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes gradient-shift { from, to { background-position: 0 50%; } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .js [data-reveal]:not(.visible) { opacity: 1; transform: none; }
}

/* ==== 22. Print ============================================ */
@media print {
  .site-header, .navbar, .mobile-menu, .nav-toggle, .skip-link, .footer-social, .hero::before, .page-header::before { display: none !important; }
  body { background: #fff; color: #000; }
  .card, .case, .cert, .timeline-card { break-inside: avoid; box-shadow: none; }
  a[href^="http"]::after { content: ' (' attr(href) ')'; font-size: 0.8em; color: #555; }
}

/* ==== 23. Shared MSc module chrome ========================= */
/* Base rules for the module pages; each page keeps its own component CSS. */
.module-header {
  position: relative;
  padding-block: var(--space-10) var(--space-8);
  text-align: center;
  border-bottom: 1px solid var(--border);
}
@media (min-width: 1024px) { .module-header { padding-block: var(--space-16) var(--space-10); } }
.module-header .container { position: relative; }
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  min-height: 44px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-3);
  margin-bottom: var(--space-4);
}
.back-link:hover { color: var(--accent); }
.module-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.7rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--ok);
  background: var(--ok-soft);
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}
.module-title { font-size: clamp(2rem, 1.4rem + 2.4vw, 3rem); letter-spacing: -0.025em; margin-bottom: var(--space-3); color: var(--text); }
.module-subtitle { font-size: var(--text-lg); color: var(--text-2); margin-bottom: var(--space-2); }
.module-institution { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--text-3); margin-bottom: var(--space-6); }
.module-meta { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.5rem var(--space-6); margin-bottom: var(--space-6); }
.meta-item { display: inline-flex; align-items: center; gap: 0.45rem; font-size: var(--text-sm); color: var(--text-2); }
.meta-item i { color: var(--accent); }
.quick-nav { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.4rem; margin-top: var(--space-4); }
.quick-nav-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 40px;
  min-width: 40px;
  padding: 0 0.8rem;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-2);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: color var(--dur-fast), border-color var(--dur-fast), background var(--dur-fast);
}
.quick-nav-btn:hover { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }
.quick-nav a:not(.quick-nav-btn) {
  display: inline-flex; align-items: center; gap: 0.45rem;
  min-height: 44px; padding: 0 1rem;
  font-weight: 600; font-size: var(--text-sm);
  color: var(--accent); background: var(--accent-soft);
  border-radius: var(--radius-md);
}
.module-header .stats-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); max-width: 820px; margin: var(--space-8) auto 0; }
@media (min-width: 768px) { .module-header .stats-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.module-header .stat-card { text-align: center; }
.content-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
}
.code-block, pre.code-block {
  margin: 0.8rem 0;
  padding: 1rem 1.2rem;
  background: var(--surface-sunken);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text);
}

/* ==== 24. Cross-navigation strip =========================== */
.xnav {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}
@media (min-width: 640px) { .xnav { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1024px) { .xnav { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.xnav-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: var(--space-4) var(--space-5);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  min-width: 0;
  transition: border-color var(--dur-fast), box-shadow var(--dur-fast), transform var(--dur-fast);
}
.xnav-item:hover { border-color: var(--border-strong); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.xnav-kicker { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-3); }
.xnav-title { font-family: var(--font-display); font-weight: 700; color: var(--text); display: flex; justify-content: space-between; gap: 0.5rem; }
.xnav-title .arrow { color: var(--accent); transition: transform var(--dur-fast) var(--ease-out); }
.xnav-item:hover .arrow { transform: translateX(3px); }

/* Featured work cards (home) */
.featured-grid { display: grid; grid-template-columns: 1fr; gap: var(--space-4); }
@media (min-width: 900px) { .featured-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.featured { display: flex; flex-direction: column; gap: var(--space-3); min-width: 0; }
.featured .eyebrow { font-size: 0.68rem; }
.featured h3 { font-size: var(--text-lg); }
.featured p { font-size: var(--text-sm); }
.featured-outcome {
  margin-top: auto;
  padding-top: var(--space-3);
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-2);
  line-height: 1.5;
}
.featured-outcome strong { font-weight: 500; color: var(--ok); }

/* Programme card (data science) */
.programme {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  align-items: center;
  padding: var(--space-6);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-8);
}
@media (min-width: 768px) { .programme { grid-template-columns: auto minmax(0, 1fr) auto; } }
.programme h2 { font-size: var(--text-xl); margin-bottom: 0.2rem; }
.programme p { font-size: var(--text-sm); }
.programme-progress { display: flex; flex-direction: column; gap: 0.4rem; align-items: flex-start; }
@media (min-width: 768px) { .programme-progress { align-items: flex-end; text-align: right; } }
.programme-progress small { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--text-3); }

.quick-access { display: grid; grid-template-columns: 1fr; gap: var(--space-3); margin-bottom: var(--space-12); }
@media (min-width: 640px) { .quick-access { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1024px) { .quick-access { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.quick-access-item {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  min-width: 0;
  transition: border-color var(--dur-fast), box-shadow var(--dur-fast), transform var(--dur-fast);
}
.quick-access-item:hover { border-color: var(--border-strong); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.quick-access-icon {
  flex-shrink: 0;
  display: grid; place-items: center;
  width: 40px; height: 40px;
  border-radius: var(--radius-md);
  background: var(--accent-soft);
  color: var(--accent);
}
.quick-access-icon.purple { background: var(--accent-soft); color: var(--color-purple); }
.quick-access-icon.orange { background: var(--accent-soft); color: var(--color-orange); }
.quick-access-text h4, .quick-access-text h3 { font-size: var(--text-sm); font-weight: 600; margin-bottom: 0.1rem; }
.quick-access-text p { font-size: var(--text-xs); color: var(--text-3); }

.modules-grid { display: grid; grid-template-columns: 1fr; gap: var(--space-4); }
@media (min-width: 768px) { .modules-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1200px) { .modules-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.module-card { display: flex; flex-direction: column; gap: var(--space-3); min-width: 0; }
.module-card .module-top { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); }
.module-card .module-index { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--text-3); letter-spacing: 0.08em; }
.module-card .module-title { font-size: var(--text-lg); margin: 0; }
.module-card .module-subtitle { font-size: var(--text-sm); color: var(--text-3); margin: 0; }
.module-outcomes h4 { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-3); margin-bottom: 0.4rem; }
.module-outcomes li { position: relative; padding-left: 1.1rem; font-size: var(--text-sm); color: var(--text-2); margin-bottom: 0.3rem; }
.module-outcomes li::before { content: ''; position: absolute; left: 0; top: 0.65em; width: 5px; height: 5px; border-radius: 50%; background: var(--accent); opacity: 0.8; }
.module-reflection {
  padding: var(--space-4);
  background: var(--surface-2);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
}
.module-reflection h4 { font-size: var(--text-xs); font-family: var(--font-mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent); margin-bottom: 0.35rem; }
.module-reflection p { font-size: var(--text-sm); }
.module-links { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: auto; padding-top: var(--space-2); }
.module-link {
  display: inline-flex; align-items: center; gap: 0.4rem;
  min-height: 40px; padding: 0 0.85rem;
  font-size: var(--text-sm); font-weight: 600;
  color: var(--accent); background: var(--accent-soft);
  border-radius: var(--radius-md);
  transition: background var(--dur-fast), color var(--dur-fast);
}
.module-link:hover { background: var(--accent); color: var(--text-inverse); }