@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@100..900&family=JetBrains+Mono:wght@400;500&display=swap');

/* ─── Color scales ─────────────────────────────────── */
:root {
  --gray-0: #fbfbfb;
  --gray-1: #eee;
  --gray-2: #e4e4e7;
  --gray-3: #d4d4d8;
  --gray-4: #c8c8cf;
  --gray-5: #a1a1a8;
  --gray-6: #4e4e55;
  --gray-7: #323239;
  --gray-8: #25252b;
  --gray-9: #1c1c20;
  --gray-10: #1d1d22;
  --gray-11: #161619;
  --gray-12: #0d0d11;

  --beige-0: #f7f9f7;
  --beige-1: #f1f3f1;
  --beige-2: #e7eae7;
  --beige-25: #d9ddd9;
  --beige-3: #cdd2cd;
  --beige-4: #b3bbb3;

  /* ─── Semantic colors (light-dark) ──────────────── */
  --color-primary:                    light-dark(#027a40, #03ef62);
  --color-background:                 light-dark(var(--beige-0), var(--gray-9));
  --color-background-alternate:       light-dark(var(--beige-1), var(--gray-11));
  --color-background-navbar:          light-dark(var(--beige-0), var(--gray-9));
  --color-background-sidebar:         light-dark(var(--beige-0), var(--gray-9));
  --color-background-card:            light-dark(var(--beige-1), var(--gray-8));
  --color-background-link-hover:      light-dark(var(--beige-2), var(--gray-8));
  --color-background-link-active:     light-dark(var(--beige-2), var(--gray-7));
  --color-background-input:           light-dark(var(--beige-1), var(--gray-11));

  --color-text:                       light-dark(var(--gray-8), var(--gray-3));
  --color-text-emphasized:            light-dark(var(--gray-10), var(--gray-0));
  --color-text-muted:                 light-dark(var(--gray-6), var(--gray-5));
  --color-text-heading-muted:         light-dark(var(--gray-6), var(--gray-3));
  --color-text-navbar:                light-dark(var(--gray-7), var(--gray-1));
  --color-text-navbar-hover:          light-dark(var(--gray-10), var(--gray-0));
  --color-text-link:                  var(--color-primary);

  --color-border:                     light-dark(var(--beige-25), var(--gray-7));
  --color-border-hover:               light-dark(var(--beige-4), var(--gray-5));
  --color-border-card:                light-dark(var(--beige-3), var(--gray-7));
  --color-marker:                     light-dark(var(--gray-7), var(--gray-6));

  /* ─── Wrapper aliases (used by page-specific CSS) ─ */
  --color-bg:       var(--color-background);
  --color-surface:  var(--color-background-alternate);
  --color-text-90:  var(--color-text-emphasized);
  --color-text-80:  var(--color-text);
  --color-text-70:  var(--color-text-muted);
  --color-text-40:  var(--color-background-alternate);
  --color-accent:   var(--color-primary);
  --color-tag-bg:   var(--color-background-card);
  --font-sans:      var(--font-family);
  --font-mono:      var(--font-family-monospace);

  /* ─── Typography ─────────────────────────────────── */
  --font-family:           -apple-system, BlinkMacSystemFont, Avenir, Helvetica, Arial, sans-serif;
  --font-family-heading:   'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-family-monospace: 'JetBrains Mono', Menlo, monospace;

  --h1: 2.2rem;
  --h2: 1.8rem;
  --h3: 1.4rem;
  --h4: 1.15rem;

  /* ─── Layout ─────────────────────────────────────── */
  --navbar-height:   60px;
  --sidebar-width:   260px;
  --content-width:   860px;
  --border-radius:   6px;
  --layout-padding:  1.5rem;

  /* ─── Root defaults ──────────────────────────────── */
  font-family: var(--font-family);
  line-height: 1.6;
  font-size: 16px;
  color-scheme: dark;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  color: var(--color-text);
  background-color: var(--color-background);
}

@media screen and (min-width: 600px) {
  :root {
    --h1: 2.8rem;
    --h2: 2.1rem;
    --h3: 1.6rem;
    --h4: 1.3rem;
    --layout-padding: 2rem;
  }
}

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

html { scroll-behavior: smooth; }
body { margin: 0; background-color: var(--color-background); color: var(--color-text); }

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

/* ─── Typography ────────────────────────────────────── */
h1, h2, h3, h4, h5 {
  font-family: var(--font-family-heading);
  color: var(--color-text-emphasized);
  line-height: 1.3;
  scroll-margin-top: calc(var(--navbar-height) + 1.5rem);
}

h1 { font-size: var(--h1); font-weight: 700; margin: 0 0 0.6rem; line-height: 1.15; }
h2 { font-size: var(--h2); font-weight: 600; margin: 1.25rem 0 0.6rem; }
h3 { font-size: var(--h3); font-weight: 500; color: var(--color-text-heading-muted); margin: 1rem 0 0.4rem; }
h4 { font-size: var(--h4); font-weight: 600; margin: 0.9rem 0 0.4rem; }
h5 { font-size: 1rem; text-transform: uppercase; letter-spacing: 0.05em; margin: 0.75rem 0 0.35rem; }

p { margin: 0.5rem 0; font-size: 1rem; }
ul { padding-left: 1.25rem; }
li { line-height: 1.7; padding-bottom: 0.2rem; }
li::marker { color: var(--color-marker); }

time { font-family: var(--font-family-monospace); font-size: 0.85rem; }

a {
  color: var(--color-text-link);
  text-decoration: none;
  font-weight: 500;
}
a:hover { color: var(--color-primary); }

/* Dotted underline links (content areas) */
.content-link {
  border-radius: 3px;
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-decoration-style: dotted;
  text-decoration-color: var(--color-text);
  text-underline-offset: 4px;
  font-weight: 600;
}
.content-link:hover {
  text-decoration-color: var(--color-text-emphasized);
  background: var(--color-background-link-active);
}

/* ─── Buttons ───────────────────────────────────────── */
button {
  font-family: var(--font-family);
  cursor: pointer;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: transparent;
  border: 2px solid var(--color-primary);
  padding: 8px 16px;
  border-radius: var(--border-radius);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  transition: 0.12s all ease;
  line-height: 1;
  white-space: nowrap;
}
.btn:hover {
  background: var(--color-primary);
  color: light-dark(white, var(--gray-12));
}
.btn:active { transform: scale(0.96); }

/* ─── Navbar (mobile / < 1020px) ───────────────────── */
.navbar {
  position: fixed;
  top: 0; left: 0;
  z-index: 100;
  width: 100%;
  height: var(--navbar-height);
  background: var(--color-background-navbar);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1rem 0 var(--layout-padding);
}

.navbar-title { display: flex; align-items: center; }

a.navbar-title-link {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--color-text-navbar);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
}
a.navbar-title-link:hover { color: var(--color-text-navbar-hover); }

.navbar-logo-icon {
  width: 28px;
  height: 28px;
  object-fit: contain;
  flex-shrink: 0;
  display: block;
}

.navbar-right {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

/* nav menu (mobile dropdown) */
.navbar-menu {
  display: none;
  flex-direction: column;
  position: fixed;
  top: var(--navbar-height);
  left: 0;
  width: 100%;
  background: var(--color-background-navbar);
  border-bottom: 1px solid var(--color-border);
  padding: 0.75rem 0;
  z-index: 99;
}
.navbar-menu.open { display: flex; }

.navbar-menu a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem var(--layout-padding);
  color: var(--color-text-navbar);
  font-weight: 500;
  font-size: 1rem;
  text-decoration: none;
}
.navbar-menu a:hover,
.navbar-menu a.active {
  background: var(--color-background-link-hover);
  color: var(--color-text-navbar-hover);
}

/* icon buttons in navbar */
.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--border-radius);
  width: 38px;
  height: 38px;
  color: var(--color-text-navbar);
  font-size: 1.1rem;
  transition: 0.1s all ease;
}
.icon-btn:hover {
  background: var(--color-background-link-hover);
  color: var(--color-text-navbar-hover);
}

@media screen and (min-width: 1020px) {
  .navbar { display: none; }
}

/* ─── Sidebar (desktop / ≥ 1020px) ─────────────────── */
.sidebar {
  display: none;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  scrollbar-width: thin;
  background: var(--color-background-sidebar);
  border-right: 1px solid var(--color-border);
  min-width: var(--sidebar-width);
  width: var(--sidebar-width);
}

.sidebar-section {
  padding: 0.85rem 1.1rem;
  border-bottom: 1px solid var(--color-border);
}
.sidebar-section:last-child {
  border-bottom: none;
  padding-bottom: 1.5rem;
}

.sidebar-name-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

a.sidebar-title-link {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--color-text-emphasized);
}
a.sidebar-title-link:hover .site-name { text-decoration: underline; text-decoration-style: dotted; }

.site-name {
  font-family: var(--font-family-heading);
  font-size: 1.05rem;
  font-weight: 600;
  white-space: nowrap;
  color: var(--color-text-emphasized);
}

.sidebar-avatar-icon {
  width: 36px;
  height: 36px;
  object-fit: contain;
  flex-shrink: 0;
  display: block;
}

.sidebar-bio {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin: 0.5rem 0 0;
  line-height: 1.5;
}

.sidebar-section h2 {
  font-family: var(--font-family);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin: 0 0 0.6rem;
}

.sidebar-nav-links {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.sidebar-nav-links a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-radius: var(--border-radius);
  font-size: 0.97rem;
  font-weight: 500;
  color: var(--color-text);
  padding: 5px 0.5rem;
  margin: 0 -0.5rem;
  text-decoration: none;
}
.sidebar-nav-links a:hover {
  background: var(--color-background-link-hover);
  color: var(--color-text-emphasized);
}
.sidebar-nav-links a.active {
  background: var(--color-background-link-active);
  color: var(--color-text-emphasized);
}

.sidebar-links {
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.sidebar-links a, .sidebar-links span {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.sidebar-links a:hover { color: var(--color-text-emphasized); }

.sidebar-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.25rem;
}
.sidebar-tag {
  font-size: 0.75rem;
  background: var(--color-background-card);
  border: 1px solid var(--color-border-card);
  color: var(--color-text);
  padding: 2px 8px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.sidebar-tag:hover {
  background: var(--color-background-link-hover);
  border-color: var(--color-text-muted);
  color: var(--color-text-muted);
}

@media screen and (min-width: 1020px) {
  .sidebar { display: flex; flex-direction: column; }
}

/* ─── Layout grid ───────────────────────────────────── */
.layout {
  padding-top: var(--navbar-height);
  min-height: 100vh;
}

@media screen and (min-width: 1020px) {
  .layout {
    padding-top: 0;
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    max-width: calc(var(--sidebar-width) + var(--content-width) + 6rem);
    margin: 0 auto;
  }
}

.main-wrapper { min-height: 100vh; display: flex; flex-direction: column; }

.main-content {
  flex: 1;
  padding: var(--layout-padding);
  width: 100%;
}

@media screen and (min-width: 1020px) {
  .main-content {
    padding: 1.5rem 2rem;
    margin-left: 0;
    max-width: var(--content-width);
  }
}

/* ─── Section headers (shared across pages) ─────────── */
.section-header,
.education-title,
.experience-title,
.project-title,
.skill-title,
.extracurricular-title {
  font-family: var(--font-family);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.6rem;
  margin: 1.5rem 0 0.75rem;
  display: block;
  text-decoration: none;
}

/* Shared list entry sizing */
.education-list,
.experience-list,
.extracurricular-list {
  list-style: none;
  padding: 0;
}

.education-degree,
.extracurricular-position {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text-emphasized);
  margin-bottom: 0.15rem;
}

.education-place,
.experience-place,
.experience-place a,
.skill-organization {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.education-date,
.experience-date,
.skill-date,
.extracurricular-date {
  font-size: 0.82rem !important;
  font-style: normal;
  font-family: var(--font-family-monospace);
  color: var(--color-text-muted);
  white-space: nowrap;
}

/* Research tags (shared) */
.research-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.5rem;
}
.research-tag {
  font-size: 0.78rem;
  background: var(--color-background-card);
  border: 1px solid var(--color-border-card);
  color: var(--color-text);
  padding: 3px 10px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.research-tag:hover {
  background: var(--color-background-link-hover);
  border-color: var(--color-text-muted);
  color: var(--color-text-muted);
}

/* ─── Page view counter ─────────────────────────────── */
.sidebar-views {
  margin-top: auto;
  padding: 0.6rem 1.1rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.sidebar-views-icon { font-size: 0.72rem; }

.sidebar-views-count {
  color: var(--color-text);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* ─── Footer ────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 1.25rem var(--layout-padding);
  font-size: 0.82rem;
}

.footer-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-copy { color: var(--color-text-muted); }

.footer-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.footer-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 1.1rem;
  transition: color 0.12s ease;
}
.footer-links a:hover { color: var(--color-primary); }

/* ─── Scroll-to-top ─────────────────────────────────── */
.scroll-btn {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-background-navbar);
  color: var(--color-text-muted);
  font-size: 1rem;
  display: none;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 50;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  transition: color 0.12s ease, border-color 0.12s ease;
}
.scroll-btn:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

/* ─── Large links (hero CTA) ────────────────────────── */
.large-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
a.large-link {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-text-link);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-decoration-style: dotted;
  text-decoration-color: var(--color-text);
  text-underline-offset: 5px;
}
a.large-link:hover {
  text-decoration-color: var(--color-text-emphasized);
}