/* ─── Design Tokens ──────────────────────────────────────────────────── */
:root {
  --bg-primary:    #1a1e2e;
  --bg-secondary:  #242840;
  --bg-surface:    #2e3350;
  --accent:        #4f8ef7;
  --accent-hover:  #7aafff;
  --text-primary:  #edf0f7;
  --text-muted:    #a8b2cc;
  --border:        #3a4060;
  --lvl-1:         #4f8ef7;
  --lvl-2:         #2eaa8c;
  --lvl-3:         #b58a2e;
}

/* ─── Base ───────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  margin: 0;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Segoe UI', Arial, sans-serif;
  line-height: 1.65;
}

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

h1, h2, h3 { line-height: 1.2; }
.muted { color: var(--text-muted); margin: 0 0 10px; }

.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  background: var(--accent);
  color: var(--bg-primary);
  padding: 8px 14px;
  border-radius: 6px;
  z-index: 2000;
  font-weight: 700;
}
.skip-link:focus { top: 12px; text-decoration: none; }

/* ─── Header ─────────────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 28px;
  background-color: rgba(36, 40, 64, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  transition: transform 0.3s;
}
.site-header.hidden { transform: translateY(-100%); }

.monogram {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 2px solid var(--accent);
  border-radius: 10px;
  color: var(--accent);
  font-weight: 800;
  letter-spacing: 0.04em;
}
.monogram:hover { background: var(--accent); color: var(--bg-primary); text-decoration: none; }

.site-header nav { display: flex; flex-wrap: wrap; gap: 4px; justify-content: flex-end; }
.site-header nav a {
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.95em;
  padding: 6px 12px;
  border-radius: 6px;
  transition: background-color 0.2s, color 0.2s;
}
.site-header nav a:hover,
.site-header nav a:focus-visible {
  background-color: var(--accent);
  color: var(--bg-primary);
  text-decoration: none;
  outline: none;
}

/* ─── Hero ───────────────────────────────────────────────────────────── */
.hero {
  max-width: 900px;
  margin: 0 auto;
  padding: 96px 24px 72px;
}
.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 0.85em;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.hero h1 {
  margin: 0 0 20px;
  font-size: clamp(2.6rem, 8vw, 4.5rem);
  letter-spacing: -0.02em;
}
.lede {
  max-width: 640px;
  margin: 0 0 32px;
  color: var(--text-muted);
  font-size: 1.2em;
}

.pills { display: flex; flex-wrap: wrap; gap: 12px; }
.pill {
  display: inline-block;
  padding: 9px 20px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-weight: 600;
  transition: border-color 0.2s, transform 0.2s, background-color 0.2s;
}
.pill:hover { border-color: var(--accent); color: var(--text-primary); text-decoration: none; transform: translateY(-2px); }
.pill.primary { background: var(--accent); border-color: var(--accent); color: var(--bg-primary); }
.pill.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--bg-primary); }

/* ─── Sections ───────────────────────────────────────────────────────── */
.section {
  max-width: 900px;
  margin: 0 auto;
  padding: 56px 24px;
}
.section-title {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0 0 28px;
  font-size: 1.9em;
}
.section-title span {
  color: var(--accent);
  font-size: 0.5em;
  font-weight: 700;
  letter-spacing: 0.1em;
}
.section-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ─── About ──────────────────────────────────────────────────────────── */
.about-grid { display: grid; grid-template-columns: 1.6fr 1fr; gap: 32px; }
.about-text p { margin: 0 0 16px; }
.about-aside {
  align-self: start;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: 10px;
  padding: 20px 22px;
  color: var(--text-muted);
  font-size: 0.95em;
}
.about-aside h3 {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 0.85em;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.about-aside p { margin: 0 0 12px; }
.about-aside p:last-child { margin-bottom: 0; }

/* ─── Timeline ───────────────────────────────────────────────────────── */
.timeline { list-style: none; margin: 0; padding: 0 0 0 24px; border-left: 2px solid var(--border); }
.timeline-item { position: relative; padding-bottom: 8px; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 6px;
  width: 14px;
  height: 14px;
  background: var(--accent);
  border: 3px solid var(--bg-primary);
  border-radius: 50%;
}
.timeline-meta {
  color: var(--accent);
  font-size: 0.85em;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.timeline-body h3 { margin: 4px 0 2px; font-size: 1.25em; }
.timeline-body ul:not(.tags) { color: var(--text-muted); padding-left: 20px; }

/* ─── Tags ───────────────────────────────────────────────────────────── */
.tags { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 14px 0; }
.tags li {
  padding: 3px 12px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-muted);
  font-size: 0.85em;
}

/* ─── Projects: folder browser ───────────────────────────────────────── */
.hint { margin: -12px 0 20px; color: var(--text-muted); font-size: 0.9em; }

.folders { display: flex; flex-wrap: wrap; gap: 6px; align-items: flex-end; }
.folder {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 20px 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: 12px 12px 0 0;
  color: var(--text-muted);
  font-family: inherit;
  text-align: left;
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s, transform 0.2s;
}
.folder:hover { background: var(--bg-surface); color: var(--text-primary); transform: translateY(-2px); }
.folder.active { background: var(--bg-secondary); color: var(--text-primary); border-top: 3px solid var(--accent); padding-top: 8px; }
.folder:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.folder-name { font-weight: 700; }
.folder-date { font-size: 0.8em; color: var(--text-muted); }

.folder-panels {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 0 12px 12px 12px;
  padding: 28px 30px;
}
.folder-panel[hidden] { display: none; }
.folder-panel { animation: flip-in 0.3s ease-out; }
@keyframes flip-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.panel-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 10px; }
.panel-head h3 { margin: 0; font-size: 1.4em; }
.status {
  padding: 2px 12px;
  border-radius: 999px;
  background: rgba(79, 142, 247, 0.15);
  border: 1px solid var(--accent);
  color: var(--accent);
  font-size: 0.8em;
  font-weight: 700;
}
.status.done { background: rgba(46, 170, 140, 0.15); border-color: var(--lvl-2); color: var(--lvl-2); }
.panel-links { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }
.panel-links .pill { background: var(--bg-surface); }
.panel-links .pill.primary { background: var(--accent); }

.pager { display: flex; align-items: center; justify-content: center; gap: 18px; margin-top: 18px; color: var(--text-muted); font-size: 0.9em; }
.pager-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 1.3em;
  line-height: 1;
  cursor: pointer;
  transition: border-color 0.2s, background-color 0.2s;
}
.pager-btn:hover { border-color: var(--accent); background: var(--bg-surface); }

/* ─── Skills ─────────────────────────────────────────────────────────── */
.skill-groups { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
.skill-group {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 22px;
}
.skill-group h3 {
  margin: 0 0 14px;
  color: var(--text-muted);
  font-size: 0.85em;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; margin: 0; padding: 0; }
.chips li {
  padding: 4px 12px;
  border-radius: 6px;
  background: var(--bg-surface);
  border-left: 3px solid var(--border);
  font-size: 0.9em;
  font-weight: 600;
  transition: transform 0.2s;
}
.chips li:hover { transform: translateY(-2px); }
.chips .lvl-1 { border-left-color: var(--lvl-1); }
.chips .lvl-2 { border-left-color: var(--lvl-2); }
.chips .lvl-3 { border-left-color: var(--lvl-3); }

.legend { margin: 18px 0 0; color: var(--text-muted); font-size: 0.85em; }
.dot { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin: 0 4px 0 14px; }
.dot:first-child { margin-left: 0; }
.dot.lvl-1 { background: var(--lvl-1); }
.dot.lvl-2 { background: var(--lvl-2); }
.dot.lvl-3 { background: var(--lvl-3); }

/* ─── Courses ────────────────────────────────────────────────────────── */
.courses summary {
  display: inline-block;
  padding: 9px 20px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-secondary);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  transition: border-color 0.2s;
}
.courses summary::-webkit-details-marker { display: none; }
.courses summary:hover { border-color: var(--accent); }
.courses[open] summary { margin-bottom: 18px; }

.courses-toolbar { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; flex-wrap: wrap; }
.courses-sort-label {
  margin-right: 4px;
  color: var(--text-muted);
  font-size: 0.85em;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.sort-btn {
  background-color: var(--bg-surface);
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 14px;
  font-family: inherit;
  font-size: 0.85em;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s, border-color 0.2s;
}
.sort-btn:hover { background-color: var(--bg-secondary); color: var(--text-primary); border-color: var(--accent); }
.sort-btn.active { background-color: var(--accent); color: #fff; border-color: var(--accent); }
.sort-arrow { display: inline-block; margin-left: 4px; }

.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: 8px; }
table { width: 100%; border-collapse: collapse; }
th {
  padding: 12px 16px;
  background-color: var(--bg-surface);
  border-bottom: 2px solid var(--accent);
  color: var(--accent);
  font-size: 0.8em;
  letter-spacing: 0.07em;
  text-align: left;
  text-transform: uppercase;
}
td {
  padding: 11px 16px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  font-size: 0.95em;
}
tr:nth-child(even) td { background-color: var(--bg-surface); }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover td { background-color: #2a3060; }

/* ─── Contact ────────────────────────────────────────────────────────── */
.contact-lede { margin: 0 0 24px; color: var(--text-muted); font-size: 1.1em; }
.contact-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.contact-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 20px 24px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: border-color 0.2s, transform 0.2s;
}
.contact-card:hover { border-color: var(--accent); transform: translateY(-3px); text-decoration: none; }
.contact-card-label {
  color: var(--text-muted);
  font-size: 0.78em;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.contact-card-value { color: var(--text-primary); font-weight: 500; overflow-wrap: anywhere; }

/* ─── Footer ─────────────────────────────────────────────────────────── */
.site-footer {
  margin-top: 40px;
  padding: 28px 24px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.9em;
  text-align: center;
}

/* ─── Fade-in ────────────────────────────────────────────────────────── */
.fade-in-section {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.fade-in-section.visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .fade-in-section { opacity: 1; transform: none; transition: none; }
  .folder-panel { animation: none; }
}

/* ─── Responsive ─────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .site-header { padding: 10px 14px; }
  .site-header nav a { padding: 5px 8px; font-size: 0.85em; }
  .hero { padding: 56px 18px 40px; }
  .section { padding: 40px 18px; }
  .about-grid { grid-template-columns: 1fr; }
  .folder { flex: 1 1 100%; border-bottom: 1px solid var(--border); border-radius: 10px; }
  .folder-panels { border-radius: 12px; margin-top: 8px; padding: 22px 18px; }
  th, td { padding: 9px 10px; font-size: 0.88em; }
}