/* ===== 1. VARIABLES (colours, fonts, spacing) ===== */
:root {
  --color-text: #1c2026;
  --color-muted: #646b75;
  --color-bg: #f7f7f5;
  --color-surface: #ffffff;
  --color-accent: #1d6b8f;
  --color-accent-soft: #e4eff4;
  --color-line: #e2e4e7;
  --font-main: "Segoe UI", Arial, sans-serif;
  --font-mono: Consolas, "Courier New", monospace;
  --space: 1rem;
  --page-width: 68rem;
  --radius: 10px;
}

/* ===== 2. BASE ===== */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-main);
  font-size: 1.0625rem;          /* 17px */
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

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

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

h1 {
  margin: 0 0 var(--space);
  font-size: 2.75rem;
  line-height: 1.15;
  font-weight: 600;
  letter-spacing: -0.02em;
}

h2 {
  margin: 0 0 0.75rem;
  font-size: 1.25rem;
  font-weight: 600;
}

/* Small mono label used above headings */
.label {
  display: block;
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.lead {
  max-width: 36rem;
  font-size: 1.2rem;
  color: var(--color-muted);
}

.muted {
  color: var(--color-muted);
}

.text-link {
  font-weight: 600;
  text-decoration: none;
}

.text-link:hover {
  text-decoration: underline;
}

.button {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  margin-right: var(--space);
  border-radius: var(--radius);
  background: var(--color-text);
  color: var(--color-bg);
  font-weight: 600;
  text-decoration: none;
}

.button:hover {
  background: var(--color-accent);
}

/* ===== 3. HEADER + NAV ===== */
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space);
  max-width: var(--page-width);
  margin: 0 auto;
  padding: calc(var(--space) * 2) calc(var(--space) * 2);
}

.logo {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

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

nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

nav a {
  display: block;
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  color: var(--color-muted);
  text-decoration: none;
}

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

nav a.active {
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-weight: 600;
}

/* ===== 4. PAGE LAYOUT ===== */
main {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 0 calc(var(--space) * 2);
}

main section {
  padding: calc(var(--space) * 3) 0;
}

.page-intro {
  padding-top: calc(var(--space) * 5);
  border-bottom: 1px solid var(--color-line);
}

/* ===== 5. HOME ===== */
.hero {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: calc(var(--space) * 4);
  padding-top: calc(var(--space) * 5);
  padding-bottom: calc(var(--space) * 5);
}

.hero h1 {
  font-size: 3.5rem;
}

.hero-links {
  margin-top: calc(var(--space) * 2);
}

.profile-photo {
  border-radius: 50%;
  border: 6px solid var(--color-surface);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.about,
.facts {
  border-top: 1px solid var(--color-line);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: calc(var(--space) * 3);
}

.about-grid p {
  margin: 0;
  font-size: 1.15rem;
}

.fact-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: calc(var(--space) * 2);
  list-style: none;
  margin: 0;
  padding: 0;
  color: var(--color-muted);
}

.fact-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--color-text);
}

/* ===== 5b. PROJECT SLIDESHOW (CSS only, no JavaScript) ===== */
/* 4 slides + a copy of slide 1 at the end so the loop has no jump.
   One cycle = 12s: each slide stays 2.5s, then slides across in 0.5s. */
.showcase {
  padding-top: 0;
}

/* A light card, like the cards on the Skills page, so the dark
   screenshots sit inside the page instead of clashing with it. */
.slideshow {
  overflow: hidden;
  max-width: 48rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-surface);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
}

.slides {
  display: flex;
  width: 500%;                   /* 5 slides, each 20% of this */
  animation: slide-across 12s ease-in-out infinite;
}

.slideshow:hover .slides {
  animation-play-state: paused;  /* hold still while someone is looking */
}

.slide {
  flex: none;
  width: 20%;
  margin: 0;
  padding: 0.75rem 0.75rem 0;    /* white frame around each screenshot */
}

.slide img {
  display: block;
  width: 100%;
  aspect-ratio: 2 / 1;           /* the screenshots are 2:1 */
  object-fit: cover;
  border: 1px solid var(--color-line);
  border-radius: calc(var(--radius) - 4px);
}

/* Project name sits on the white card, under the screenshot */
.slide figcaption {
  padding: 0.75rem 0.25rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  color: var(--color-muted);
}

.slide figcaption::before {
  content: "";
  display: inline-block;
  width: 0.5rem;
  height: 0.5rem;
  margin-right: 0.6rem;
  border-radius: 50%;
  background: var(--color-accent);
}

@keyframes slide-across {
  0%, 20.83%  { transform: translateX(0); }
  25%, 45.83% { transform: translateX(-20%); }
  50%, 70.83% { transform: translateX(-40%); }
  75%, 95.83% { transform: translateX(-60%); }
  100%        { transform: translateX(-80%); }
}

/* Visitors who ask for less motion get a swipeable strip instead */
@media (prefers-reduced-motion: reduce) {
  .slideshow {
    overflow-x: auto;
    scroll-snap-type: x mandatory;
  }

  .slides {
    width: 400%;
    animation: none;
  }

  .slide {
    width: 25%;
    scroll-snap-align: start;
  }

  .slide-copy {
    display: none;
  }
}

/* ===== 6. SKILLS ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: calc(var(--space) * 1.5);
}

.card {
  padding: calc(var(--space) * 1.75);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.card ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--color-muted);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: calc(var(--space) * 3);
  border-top: 1px solid var(--color-line);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.tag-list li {
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  background: var(--color-surface);
  font-size: 0.95rem;
}

/* ===== 7. PROJECTS ===== */
.project {
  display: grid;
  grid-template-columns: 5rem 1fr;
  gap: var(--space);
  padding: calc(var(--space) * 2) 0;
  border-bottom: 1px solid var(--color-line);
}

.project:first-child {
  padding-top: 0;
}

.project-number {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--color-accent);
}

.project h2 {
  margin-bottom: 0.25rem;
  font-size: 1.5rem;
}

.project p {
  max-width: 44rem;
}

.project-summary {
  font-size: 1.15rem;
}

.project-points {
  max-width: 44rem;
  margin: 0 0 var(--space);
  padding-left: 1.1rem;
  color: var(--color-muted);
}

.project-points li {
  margin-bottom: 0.4rem;
}

.project .tag-list {
  margin-bottom: var(--space);
}

.project-meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-muted);
}

/* ===== 8. EDUCATION TABLE ===== */
table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

caption {
  text-align: left;
  padding-bottom: 0.75rem;
  color: var(--color-muted);
}

th,
td {
  text-align: left;
  vertical-align: top;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-line);
}

th {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.year {
  font-family: var(--font-mono);
  white-space: nowrap;
  color: var(--color-accent);
}

/* ===== 9. CONTACT ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: calc(var(--space) * 1.5);
}

.contact-card {
  display: block;
  padding: calc(var(--space) * 2);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  text-decoration: none;
}

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

.contact-value {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-text);
  word-break: break-word;
}

.contact-card-wide {
  grid-column: 1 / -1;
}

/* ===== 9b. HIDDEN EASTER EGG (education page) ===== */
.secret {
  position: fixed;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 1rem 1.5rem;          /* makes the hover area bigger than the text */
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--color-bg);        /* same as the page background = invisible */
  transition: color 0.3s ease;
  cursor: default;
}

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

.secret sub,
.secret sup {
  line-height: 0;                /* stop the sub/sup from changing the line height */
}

/* ===== 10. FOOTER ===== */
.site-footer {
  display: flex;
  justify-content: space-between;
  width: calc(100% - var(--space) * 4);
  max-width: calc(var(--page-width) - var(--space) * 4);
  margin: calc(var(--space) * 4) auto 0;
  padding: calc(var(--space) * 2) 0;
  border-top: 1px solid var(--color-line);
  font-size: 0.9rem;
  color: var(--color-muted);
}

.site-footer p {
  margin: 0;
}

/* ===== 11. SMALL SCREENS ===== */
@media (max-width: 760px) {
  h1,
  .hero h1 {
    font-size: 2.25rem;
  }

  .hero,
  .about-grid,
  .card-grid,
  .split,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .hero img {
    order: -1;
    width: 160px;
  }

  .fact-list {
    grid-template-columns: 1fr;
  }

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