/* ── Fonts ── */
@font-face {
  font-family: 'Recoleta';
  src: url('RecoletaBold.otf') format('opentype');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

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

/* ── Tokens ── */
:root {
  --bg:          #00a8e8;
  --card:        #0077aa;
  --card-hover:  #005f80;
  --border:      rgba(0, 40, 70, 0.3);
  --border-hover:rgba(0, 20, 50, 0.55);
  --text:        #d6f0ff;
  --text-bright: #d6f0ff;
  --text-muted:  #7ab8d8;
  --badge-bg:    #002535;
  --badge-border:rgba(0, 40, 70, 0.4);
  --radius:      16px;
  --max-w:       900px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ── Typography ── */
h1, h2, h3 {
  font-family: 'Recoleta', Georgia, serif;
  font-weight: 700;
  line-height: 1.1;
  color: var(--text-bright);
}

strong { color: #ffffff; font-weight: 700; }

/* ── Layout ── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
}

.container--narrow { max-width: 680px; }

.section { padding: 7rem 0; }

/* ── Hero ── */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4rem 2rem;
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

#hero h1 {
  font-size: clamp(3.5rem, 10vw, 7rem);
  letter-spacing: -0.01em;
  color: var(--text-bright);
}

.hero-sub {
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.8rem;
  font-weight: 400;
}

.hero-nav {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.hero-nav a {
  display: inline-block;
  padding: 1.2rem 4rem;
  border: none;
  border-radius: 14px;
  color: var(--text);
  text-decoration: none;
  font-size: 1.15rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  background: var(--card);
  transition: background 0.2s, color 0.2s;
  min-width: 220px;
  text-align: center;
}

.hero-nav a:hover {
  background: var(--card-hover);
  color: var(--text-bright);
}

/* ── Section headings ── */
.section-heading {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: 0.6rem;
  letter-spacing: -0.01em;
}

.section-sub {
  color: var(--text);
  font-size: 0.9rem;
  margin-bottom: 1.25rem;
}

/* ── Projects ── */
.projects-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 3.5rem;
  position: relative;
}

.projects-list::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0; bottom: 0;
  width: 1px;
  background: var(--border);
  transform: translateX(-50%);
}

/* ── Project card ── */
.project-card {
  position: relative;
  width: 58%;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem 2rem;
  cursor: pointer;
  transition: background 0.22s, border-color 0.22s, transform 0.22s;
  margin-right: auto;
}

.project-card--right {
  margin-right: 0;
  margin-left: auto;
}

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

.project-card.open {
  border-color: var(--border-hover);
  transform: none;
}

/* Floating date badge */
.project-card::before {
  content: attr(data-year);
  position: absolute;
  top: -14px;
  right: -2px;
  background: var(--badge-bg);
  border: 1px solid var(--badge-border);
  border-radius: 100px;
  padding: 0.2rem 0.8rem;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

/* Card head row */
.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.45rem;
}

.card-head h3 {
  font-size: 1.15rem;
  color: var(--text-bright);
  transition: color 0.2s;
}

.project-card:hover .card-head h3 { color: #f5caa8; }

.card-arrow {
  color: var(--text-muted);
  font-size: 1rem;
  flex-shrink: 0;
  transition: transform 0.3s ease, color 0.2s;
  display: inline-block;
}

.project-card.open .card-arrow {
  transform: rotate(180deg);
  color: var(--text-bright);
}

/* Teaser — always visible */
.card-teaser {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Expanded body */
.card-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.42s ease, opacity 0.3s ease;
  opacity: 0;
}

.project-card.open .card-body {
  max-height: 400px;
  opacity: 1;
}

.card-body > p {
  font-size: 0.875rem;
  color: var(--text);
  line-height: 1.8;
  margin-top: 1rem;
  margin-bottom: 1.1rem;
}

.card-links {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.card-links a {
  display: inline-block;
  padding: 0.45rem 1rem;
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--badge-bg);
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.card-links a:hover {
  border-color: var(--border-hover);
  color: var(--text-bright);
  background: var(--card-hover);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  margin-bottom: 1.1rem;
}

.tag-list li {
  font-size: 0.7rem;
  font-weight: 500;
  padding: 0.2rem 0.65rem;
  border-radius: 100px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  letter-spacing: 0.03em;
}


/* ── About ── */
.about-body p {
  font-size: 1rem;
  color: var(--text);
  line-height: 1.85;
  margin-bottom: 1.1rem;
}

.about-links {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

/* ── Pill links ── */
.pill-link {
  display: inline-block;
  padding: 0.55rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.85rem;
  background: var(--card);
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.pill-link:hover {
  background: var(--card-hover);
  border-color: var(--border-hover);
  color: var(--text-bright);
}

/* ── Skills ── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
  margin-top: 1.25rem;
}

.skill-label {
  font-family: 'Inter', sans-serif;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #a8d8f0;
  margin-bottom: 1rem;
}

.skill-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.skill-list li {
  font-size: 0.9rem;
  color: var(--text);
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border);
}

.skill-list li:last-child { border-bottom: none; }

/* ── Contact ── */
.contact-links {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

/* ── Footer ── */
footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text);
}

.back-top {
  color: var(--text);
  text-decoration: none;
  font-size: 0.8rem;
  transition: color 0.2s;
}

.back-top:hover { color: var(--text-bright); }

/* ── Floating back button ── */
.back-btn {
  position: fixed;
  bottom: 2rem;
  left: 2rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.25s, transform 0.25s, background 0.2s, border-color 0.2s, color 0.2s;
  z-index: 50;
}

.back-btn.visible {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}

.back-btn:hover {
  background: var(--card-hover);
  border-color: var(--border-hover);
  color: var(--text-bright);
}

/* ── Scroll reveal ── */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: none; }

/* ── Responsive ── */
@media (max-width: 700px) {
  .projects-list::before { display: none; }

  .project-card,
  .project-card--right {
    width: 100%;
    margin: 0;
  }

  .skills-grid { grid-template-columns: 1fr; gap: 2rem; }

  .hero-nav a { min-width: 130px; padding: 0.65rem 1.5rem; }

  .back-btn { bottom: 1.25rem; left: 1.25rem; }
}