/* ============================================================
   Kamel Aggoun — Portfolio
   css/style.css
   ------------------------------------------------------------
   Contents
   01. Design tokens (colors, fonts, spacing)
   02. Reset & base
   03. Utilities (container, sr-only, skip-link, placeholder)
   04. Buttons, tags, chips
   05. Header & navigation
   06. Hero
   07. Sections (shared)
   08. About
   09. Skills
   10. Projects
   11. Experience (timeline)
   12. Education
   13. Certifications
   14. Contact
   15. Footer
   16. Back to top
   17. Scroll reveal
   18. Focus states & reduced motion
   19. Responsive breakpoints
   20. Print
   ============================================================ */

/* ---------- 01. Design tokens ---------- */
:root {
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* Light theme */
  --bg: #f7f9fb;
  --bg-header: rgba(247, 249, 251, 0.86);
  --surface: #ffffff;
  --surface-2: #eef2f6;
  --text: #0b1220;
  --text-secondary: #3f4a5c;
  --text-muted: #606a78;   /* nudged from #66707f so muted text also clears WCAG AA on hover backgrounds */
  --border: #e2e8f0;
  --border-strong: #c9d3df;
  --accent: #0f766e;
  --accent-strong: #115e59;
  --accent-soft: rgba(15, 118, 110, 0.1);
  --accent-contrast: #ffffff;
  --grid-dot: rgba(15, 118, 110, 0.18);
  --shadow-sm: 0 1px 2px rgba(11, 18, 32, 0.06);
  --shadow-md: 0 6px 24px rgba(11, 18, 32, 0.08);

  --header-h: 64px;
  --radius: 10px;
  --container: 1080px;
  --d: 0s; /* default stagger delay (overridden inline in the hero SVG) */
}

[data-theme="dark"] {
  --bg: #0b1220;
  --bg-header: rgba(11, 18, 32, 0.86);
  --surface: #111a2c;
  --surface-2: #1a2438;
  --text: #e8ecf3;
  --text-secondary: #b7c0d0;
  --text-muted: #8b95a7;
  --border: #223049;
  --border-strong: #33425e;
  --accent: #2dd4bf;
  --accent-strong: #5eead4;
  --accent-soft: rgba(45, 212, 191, 0.12);
  --accent-contrast: #04211d;
  --grid-dot: rgba(45, 212, 191, 0.16);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.45);
}

/* ---------- 02. Reset & base ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

* { margin: 0; }

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

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

ul, ol { list-style: none; padding: 0; }

a { color: var(--accent); text-decoration: none; }

a:hover { color: var(--accent-strong); }

button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }

h1, h2, h3, h4, h5 {
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--text);
}

h2 { font-size: clamp(1.6rem, 3vw + 0.5rem, 2.15rem); }
h3 { font-size: 1.15rem; }
h4, h5 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; }

p { max-width: 65ch; }

/* ---------- 03. Utilities ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

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

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100%;
  z-index: 100;
  padding: 0.6rem 1rem;
  background: var(--accent);
  color: var(--accent-contrast);
  border-radius: 6px;
  font-weight: 500;
  transition: top 0.2s ease;
}

.skip-link:focus { top: 0.75rem; color: var(--accent-contrast); }

.placeholder {
  color: var(--text-muted);
  font-style: italic;
  border-bottom: 1px dashed var(--border-strong);
}

/* ---------- 04. Buttons, tags, chips ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.25rem;
  border-radius: 8px;
  font-weight: 500;
  font-size: 0.95rem;
  line-height: 1.2;
  border: 1px solid transparent;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.btn:active { transform: translateY(1px); }

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

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

.btn-outline {
  background: transparent;
  color: var(--text);
  border-color: var(--border-strong);
}

.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

.btn.is-disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.tag,
.chip {
  display: inline-flex;
  align-items: center;
  padding: 0.22rem 0.65rem;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--surface-2);
  border: 1px solid var(--border);
  white-space: nowrap;
}

/* ---------- 05. Header & navigation ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg-header);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  height: var(--header-h);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text);
  font-weight: 600;
  letter-spacing: -0.01em;
}

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

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-contrast);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.logo-name { font-size: 1rem; }

.site-nav { margin-left: auto; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.35rem;
}

.nav-link {
  position: relative;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding-block: 0.25rem;
}

.nav-link:hover { color: var(--text); }

.nav-link.active { color: var(--accent); }

.nav-link.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
}

/* Mobile menu toggle */
.nav-toggle-input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  overflow: hidden;
}

.nav-toggle {
  display: none;
  position: relative;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  cursor: pointer;
}

.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--text);
  transition: transform 0.25s ease, opacity 0.25s ease, top 0.25s ease;
}

.nav-toggle-bars { position: relative; }

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle-bars::before { top: -6px; }
.nav-toggle-bars::after { top: 6px; }

.nav-toggle-input:checked + .nav-toggle .nav-toggle-bars { background: transparent; }
.nav-toggle-input:checked + .nav-toggle .nav-toggle-bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle-input:checked + .nav-toggle .nav-toggle-bars::after { top: 0; transform: rotate(-45deg); }

.nav-toggle-input:focus-visible + .nav-toggle {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.header-actions { display: flex; align-items: center; gap: 0.5rem; }

/* Persistent CV shortcut — recruiters should never have to hunt for it */
.header-cv {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  height: 38px;
  padding: 0 0.8rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.header-cv:hover {
  color: var(--accent-contrast);
  background: var(--accent);
  border-color: var(--accent);
}

.theme-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 8px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition: color 0.2s ease, border-color 0.2s ease;
}

html.js .theme-toggle { display: inline-flex; }

.theme-toggle:hover { color: var(--text); border-color: var(--border-strong); }

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

/* ---------- 06. Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(var(--grid-dot) 1px, transparent 1px);
  background-size: 24px 24px;
  mask-image: radial-gradient(ellipse 70% 70% at 70% 30%, #000 0%, transparent 72%);
  -webkit-mask-image: radial-gradient(ellipse 70% 70% at 70% 30%, #000 0%, transparent 72%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 2.5rem;
  align-items: center;
  padding-block: clamp(3.5rem, 8vw, 6.5rem);
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.hero-name {
  font-size: clamp(2.4rem, 6vw, 3.75rem);
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.hero-positioning {
  font-size: clamp(1.02rem, 1.7vw, 1.22rem);
  color: var(--text);
  max-width: 38ch;
  margin-bottom: 0.8rem;
  text-wrap: balance;
}

.hero-role {
  font-family: var(--font-mono);
  font-size: clamp(0.82rem, 1.4vw, 0.95rem);
  color: var(--text-secondary);
  margin-bottom: 1.1rem;
}

.hero-lead {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 1.75rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.hero-avail {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.32rem 0.72rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-secondary);
}

.hero-avail::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.hero-loc,
.hero-links {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.hero-links { gap: 0.4rem; }

.icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-secondary);
  transition: color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

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

/* Hero dashboard illustration */
.hero-visual { max-width: 460px; margin-inline: auto; }

.hero-dash {
  width: 100%;
  height: auto;
  filter: drop-shadow(var(--shadow-md));
}

.viz-card { fill: var(--surface); stroke: var(--border); stroke-width: 1.5; }
.viz-dot { fill: var(--border-strong); }
.viz-title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  fill: var(--text-secondary);
}
.viz-chip { fill: var(--accent-soft); }
.viz-chip-dot { fill: var(--accent); }
.viz-chip-text {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  fill: var(--accent);
}
.viz-grid { stroke: var(--border); stroke-width: 1; stroke-dasharray: 3 6; }
.viz-axis { stroke: var(--border); stroke-width: 1; }
.viz-area { fill: var(--accent); opacity: 0.08; }
.viz-line {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 640;
  stroke-dashoffset: 640;
  animation: draw-line 1.4s ease 0.2s forwards;
}
.viz-point { fill: var(--surface); stroke: var(--accent); stroke-width: 2; }
.viz-point-last { fill: var(--accent); animation: pulse 2.4s ease-in-out infinite; }
.viz-bar {
  fill: var(--accent);
  opacity: 0.35;
  transform-box: fill-box;
  transform-origin: bottom;
  transform: scaleY(0);
  animation: grow-bar 0.6s cubic-bezier(0.2, 0.7, 0.3, 1) forwards;
  animation-delay: var(--d, 0s);
}
.viz-bar-accent { opacity: 1; }

@keyframes draw-line { to { stroke-dashoffset: 0; } }
@keyframes grow-bar { to { transform: scaleY(1); } }
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}

/* ---------- 07. Sections (shared) ---------- */
.section {
  padding-block: clamp(3.5rem, 7vw, 5.5rem);
  border-bottom: 1px solid var(--border);
  scroll-margin-top: calc(var(--header-h) + 8px);
}

.section-head { max-width: 60ch; margin-bottom: 2.25rem; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.6rem;
}

.section-lead { margin-top: 0.75rem; color: var(--text-secondary); }

/* ---------- 08. About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: auto minmax(0, 1.5fr) minmax(0, 1fr);
  gap: 2.5rem;
  align-items: start;
}

.about-photo { margin: 0; width: 200px; }

.about-photo img {
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-2);
}

.about-text p { color: var(--text-secondary); margin-bottom: 1rem; }
.about-text p:last-child { margin-bottom: 0; }

.about-side {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  padding: 1.5rem;
}

.fact-list { display: grid; gap: 1rem; }

.fact-item {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.fact-item:last-child { padding-bottom: 0; border-bottom: none; }

.fact-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.fact-value { font-size: 0.95rem; color: var(--text); }

/* ---------- 09. Skills ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.skill-group {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1.5rem;
  box-shadow: var(--shadow-sm);
}

.skill-group-wide { grid-column: 1 / -1; }

.skill-group-title {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.9rem;
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ---------- 10. Projects ---------- */
.filters {
  display: none;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
}

html.js .filters { display: flex; }

.filter-btn {
  padding: 0.4rem 0.95rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.filter-btn:hover { border-color: var(--accent); color: var(--accent); }

.filter-btn.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
}

.projects-list {
  display: grid;
  gap: 1.25rem;
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.project-card.is-hidden { display: none; }

.project-details > .project-summary {
  list-style: none;
  cursor: pointer;
}

.project-details > .project-summary::-webkit-details-marker { display: none; }

.project-summary {
  display: grid;
  grid-template-columns: auto minmax(96px, 150px) 1fr auto;
  grid-template-rows: auto auto auto auto;
  column-gap: 1.25rem;
  row-gap: 0.4rem;
  align-items: center;
  padding: 1.25rem;
  transition: background-color 0.2s ease;
}

.project-summary:hover { background: var(--surface-2); }

.project-index {
  grid-column: 1;
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.project-thumb {
  grid-column: 2;
  grid-row: 1 / span 4;
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
}

.project-title {
  grid-column: 3;
  grid-row: 1;
  font-size: 1.15rem;
  text-transform: none;
  letter-spacing: -0.01em;
}

.project-tagline {
  grid-column: 3;
  grid-row: 2;
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.project-tags {
  grid-column: 3;
  grid-row: 3;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

/* Data scale / headline figures — visible without opening the card */
.project-metrics {
  grid-column: 3;
  grid-row: 4;
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 0.9rem;
  margin-top: 0.3rem;
}

.project-metric {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.35;
  color: var(--text-secondary);
  border-left: 2px solid var(--accent);
  padding-left: 0.45rem;
}

.project-chevron {
  grid-column: 4;
  grid-row: 1;
  align-self: start;
  margin-top: 0.3rem;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--text-muted);
  border-bottom: 2px solid var(--text-muted);
  transform: rotate(45deg);
  transition: transform 0.25s ease;
}

.project-details[open] .project-chevron { transform: rotate(225deg); }

.project-body {
  border-top: 1px solid var(--border);
  padding: 1.5rem 1.25rem 1.25rem;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.project-grid--two { grid-template-columns: repeat(2, 1fr); }

.project-field h5 {
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.project-field p { font-size: 0.92rem; color: var(--text-secondary); }

.project-field ul { display: grid; gap: 0.4rem; }

.project-field li {
  position: relative;
  padding-left: 1rem;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.project-field li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 11. Experience (timeline) ---------- */
.timeline {
  position: relative;
  display: grid;
  gap: 2rem;
  padding-left: 1.75rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: var(--border-strong);
}

.timeline-item { position: relative; }

.timeline-marker {
  position: absolute;
  left: -1.75rem;
  top: 0.45em;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.timeline-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.25rem 0.75rem;
  margin-bottom: 0.4rem;
}

.timeline-role { font-size: 1.12rem; }

.timeline-period {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.timeline-desc { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 0.6rem; }

.timeline-list { display: grid; gap: 0.35rem; }

.timeline-list li {
  position: relative;
  padding-left: 1rem;
  color: var(--text-secondary);
  font-size: 0.93rem;
}

.timeline-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--border-strong);
}

/* ---------- 12. Education ---------- */
.education-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.25rem;
}

.edu-item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.edu-degree { font-size: 1.12rem; }

.edu-field { color: var(--text-secondary); }

.edu-school { font-family: var(--font-mono); font-size: 0.85rem; color: var(--text); }

.edu-period {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ---------- 13. Certifications ---------- */
.certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 1.25rem;
}

.cert-card {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1.5rem;
  box-shadow: var(--shadow-sm);
}

.cert-cat {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

.cert-name { font-weight: 600; font-size: 1rem; }

.cert-issuer { font-size: 0.85rem; color: var(--text-secondary); }

.cert-link {
  display: inline-flex;
  align-items: center;
  /* WCAG 2.2 target size minimum is 24x24 CSS px — the link text sits at 23px */
  min-height: 24px;
  font-size: 0.85rem;
}

/* Certifications — "view all" expander */
.certs-more {
  margin-top: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.certs-more-summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  cursor: pointer;
  list-style: none;
  font-weight: 500;
  color: var(--text);
}

.certs-more-summary::-webkit-details-marker { display: none; }

.certs-more-summary:hover { background: var(--surface-2); }

.certs-count {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-left: auto;
}

.certs-chevron {
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--text-muted);
  border-bottom: 2px solid var(--text-muted);
  transform: rotate(45deg);
  transition: transform 0.25s ease;
}

.certs-more[open] .certs-chevron { transform: rotate(225deg); }

.certs-cats {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem 2rem;
  padding: 1.5rem 1.25rem;
  border-top: 1px solid var(--border);
}

.certs-cat-title {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.certs-cat-list { display: grid; }

.cert-entry {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--border);
}

.cert-entry:last-child { border-bottom: none; }

.cert-entry-link {
  color: var(--text);
  font-size: 0.9rem;
}

.cert-entry-link:hover { color: var(--accent); }

.cert-meta {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-muted);
  white-space: nowrap;
}

@media (max-width: 560px) {
  .certs-cats { grid-template-columns: 1fr; }
  .cert-entry { flex-direction: column; gap: 0.1rem; }
  .cert-meta { white-space: normal; }
}

/* ---------- 14. Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

.contact-card {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1.5rem;
  box-shadow: var(--shadow-sm);
}

.contact-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.contact-value {
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
  overflow-wrap: anywhere;
}

.contact-value:hover { color: var(--accent); }

/* ---------- 15. Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding-block: 2rem 1.75rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 500;
  color: var(--text);
  margin-right: auto;
}

.footer-brand .logo-mark { width: 30px; height: 30px; font-size: 0.72rem; }

.footer-nav {
  display: flex;
  gap: 1.25rem;
}

.footer-nav a { color: var(--text-secondary); font-size: 0.9rem; }
.footer-nav a:hover { color: var(--accent); }

.footer-copy {
  flex-basis: 100%;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ---------- 16. Back to top ---------- */
.back-to-top {
  display: none;
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 40;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-contrast);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
}

html.js .back-to-top { display: inline-flex; }

.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover { background: var(--accent-strong); color: var(--accent-contrast); }

/* ---------- 17. Scroll reveal ---------- */
/* Only applied when JavaScript is running (html.js), so the page is
   fully visible and usable when JavaScript is disabled. */
html.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

html.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 17b. What I do ---------- */
.whatido-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 1.25rem;
}

.whatido-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.whatido-card h3 { font-size: 1.05rem; margin-bottom: 0.55rem; }

.whatido-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.1rem;
}

.whatido-list { display: grid; gap: 0.45rem; }

.whatido-list li {
  position: relative;
  padding-left: 1rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.whatido-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

/* ---------- 17c. Data-analysis workflow ---------- */
.workflow {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.workflow-title { font-size: 1.05rem; margin-bottom: 1.1rem; }

.workflow-steps {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1.35rem;
}

.workflow-steps li {
  position: relative;
  padding: 0.34rem 0.72rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.workflow-steps li:not(:last-child)::after {
  content: "\2192";
  position: absolute;
  right: -1.05rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.72rem;
}

.workflow-tools {
  margin-top: 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ---------- 17d. Project groups (featured vs more) ---------- */
.projects-group + .projects-group { margin-top: 2.75rem; }

/* Applied by js/script.js when a filter hides every card in the group */
.projects-group.is-hidden { display: none; }

.projects-group-head { margin-bottom: 1.15rem; }

.projects-group-title {
  padding-bottom: 0.55rem;
  margin-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.projects-group-lead {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.projects-list--featured { gap: 1.35rem; }

.projects-list--featured .project-summary {
  grid-template-columns: auto minmax(160px, 210px) 1fr auto;
  padding: 1.5rem;
}

.projects-list--featured .project-title { font-size: 1.28rem; }

.projects-list--more .project-summary {
  grid-template-columns: auto minmax(72px, 104px) 1fr auto;
}

/* ---------- 17e. SQL excerpt ---------- */
.project-sql { margin-bottom: 1.5rem; }

.project-sql h5 { color: var(--accent); margin-bottom: 0.6rem; }

.project-sql h5 code {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0;
  text-transform: none;
}

.project-sql pre {
  margin: 0;
  padding: 1rem 1.15rem;
  overflow-x: auto;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.project-sql code {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.65;
  color: var(--text-secondary);
  white-space: pre;
}

/* ---------- 17f. Narrow desktop / tablet tuning ---------- */
@media (max-width: 1080px) {
  .nav-links { gap: 0.85rem; }
  .nav-link { font-size: 0.85rem; }
}

@media (max-width: 1000px) {
  .about-grid { grid-template-columns: auto minmax(0, 1fr); }
  .about-side { grid-column: 1 / -1; }
}

/* ---------- 18. Focus states & reduced motion ---------- */
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html.js .reveal {
    opacity: 1;
    transform: none;
  }

  .viz-line { stroke-dashoffset: 0; }
  .viz-bar { transform: scaleY(1); }
}

/* ---------- 19. Responsive breakpoints ---------- */
@media (max-width: 900px) {
  /* Mobile navigation */
  .nav-toggle { display: inline-flex; }
  .logo-name { display: none; }

  .site-nav {
    margin-left: 0;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
  }

  .nav-toggle-input:checked ~ .site-nav { display: block; }

  .nav-links {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem 1.25rem 0.75rem;
  }

  .nav-link {
    display: block;
    padding: 0.7rem 0.25rem;
    border-bottom: 1px solid var(--border);
  }

  .nav-link:last-child { border-bottom: none; }

  .nav-link.active::after { display: none; }

  /* Hero stacks */
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { max-width: 420px; margin-top: 1rem; }

  /* About stacks */
  .about-grid { grid-template-columns: 1fr; }

  /* Project summary simplifies */
  .project-summary,
  .projects-list--featured .project-summary,
  .projects-list--more .project-summary {
    grid-template-columns: auto 1fr auto;
    grid-template-rows: auto auto auto auto auto;
    padding: 1.25rem;
  }
  .project-thumb { grid-column: 1 / -1; grid-row: 1; margin-bottom: 0.6rem; }
  .project-index { grid-column: 1; grid-row: 2; align-self: center; }
  .project-title { grid-column: 2; grid-row: 2; font-size: 1.15rem; }
  .project-chevron { grid-column: 3; grid-row: 2; margin-top: 0; }
  .project-tagline { grid-column: 2 / -1; grid-row: 3; }
  .project-tags { grid-column: 2 / -1; grid-row: 4; }
  .project-metrics { grid-column: 1 / -1; grid-row: 5; }

  .project-grid { grid-template-columns: 1fr; }

  /* About: photo beside text, facts full width */
  .about-photo { width: 150px; }

  /* Hero spacing tightens */
  .hero-positioning { max-width: none; }

  /* Header CV button becomes compact */
  .header-cv { padding: 0 0.6rem; }
}

@media (max-width: 560px) {
  .hero-actions .btn { flex: 1 1 auto; justify-content: center; }
  .education-list { grid-template-columns: 1fr; }
  .logo-name { display: none; }
  .about-photo { width: 120px; }
  .workflow-steps { gap: 0.5rem 1.2rem; }
  .project-sql pre { padding: 0.85rem 0.9rem; }
}

/* ---------- 20. Print ---------- */
@media print {
  .site-header,
  .hero-visual,
  .filters,
  .workflow-steps li::after,
  .back-to-top,
  .theme-toggle,
  .nav-toggle,
  .nav-toggle-input { display: none !important; }

  body { background: #fff; color: #000; }

  /* Scroll-reveal is a screen-only effect: force every card visible so
     nothing prints blank when the page is printed without scrolling. */
  html.js .reveal,
  html.js .reveal.is-visible {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .section { border-bottom: 1px solid #ccc; }
  .project-sql pre { border: 1px solid #ccc; background: #fff; }
  .project-card, .whatido-card, .skill-group { box-shadow: none; }
}