/* ═══════════════════════════════════════════════════════
   Hardik Meisheri — Personal Site
   ═══════════════════════════════════════════════════════ */

/* ─── Custom Properties ──────────────────────────────── */
:root {
  --accent:         #0d9488;
  --accent-hover:   #0f766e;
  --accent-light:   rgba(13, 148, 136, 0.12);

  --bg:             #ffffff;
  --bg-alt:         #f8fafc;
  --bg-card:        #ffffff;

  --text:           #111827;
  --text-muted:     #6b7280;
  --text-faint:     #9ca3af;

  --border:         #e5e7eb;
  --border-subtle:  rgba(0, 0, 0, 0.05);

  --shadow-sm:      0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md:      0 4px 12px rgba(0, 0, 0, 0.08);

  --radius:         8px;
  --radius-sm:      5px;
  --radius-pill:    999px;

  --font-sans:      'Inter', system-ui, -apple-system, sans-serif;
  --font-mono:      ui-monospace, 'Cascadia Code', Menlo, monospace;

  --nav-height:     56px;
  --max-width:      760px;
  --section-pad:    72px;
  --transition:     0.15s ease;
}

[data-theme="dark"] {
  --bg:             #0f172a;
  --bg-alt:         #1a2332;
  --bg-card:        #1e293b;

  --text:           #f1f5f9;
  --text-muted:     #94a3b8;
  --text-faint:     #64748b;

  --border:         #2d3748;
  --border-subtle:  rgba(255, 255, 255, 0.05);

  --shadow-sm:      0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md:      0 4px 12px rgba(0, 0, 0, 0.35);
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition), color var(--transition);
}

img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ─── Layout ─────────────────────────────────────────── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: var(--section-pad) 0;
  background: var(--bg);
  border-top: 1px solid var(--border);
}

.section-alt {
  padding: var(--section-pad) 0;
  background: var(--bg);
  border-top: 1px solid var(--border);
}

.section-title {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 28px;
}

/* ─── Navigation ─────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition);
}

[data-theme="dark"] .site-header {
  background: rgba(15,23,42,0.92);
}

.nav {
  display: flex;
  align-items: center;
  height: var(--nav-height);
  gap: 0;
  flex-wrap: wrap;
}

.nav-name {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
  text-decoration: none;
  margin-right: auto;
  white-space: nowrap;
}
.nav-name:hover { color: var(--accent); text-decoration: none; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  text-decoration: none;
}
.nav-link:hover { color: var(--text); background: var(--accent-light); text-decoration: none; }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: 8px;
}

.theme-toggle {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: background var(--transition), color var(--transition);
}
.theme-toggle:hover { background: var(--accent-light); color: var(--accent); }

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

.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 34px;
  height: 34px;
  gap: 5px;
  border-radius: var(--radius-sm);
  padding: 4px;
}
.nav-hamburger span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--text-muted);
  border-radius: 2px;
  transition: var(--transition);
}

/* ─── About ──────────────────────────────────────────── */
.section-about {
  padding: 72px 0 60px;
  background: var(--bg);
}

.about-grid {
  display: flex;
  gap: 36px;
  align-items: flex-start;
}

.about-photo-wrap { flex-shrink: 0; }

.about-photo {
  width: 128px;
  height: 128px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--border);
}

.about-content { flex: 1; min-width: 0; }

.about-name {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
  line-height: 1.2;
  margin-bottom: 4px;
}

.about-role {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.about-role span { color: var(--accent); font-weight: 500; }

.about-bio {
  font-size: 0.93rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 10px;
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  transition: color var(--transition), border-color var(--transition), background var(--transition);
  text-decoration: none;
}
.social-link:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-light);
  text-decoration: none;
}

/* ─── Experience ─────────────────────────────────────── */
.exp-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.exp-item {
  display: flex;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border-subtle);
}
.exp-item:last-of-type { border-bottom: none; }

.exp-meta {
  flex-shrink: 0;
  width: 150px;
  padding-top: 2px;
}

.exp-period {
  font-size: 0.78rem;
  color: var(--text-faint);
  font-weight: 500;
  white-space: nowrap;
}

.exp-body { flex: 1; min-width: 0; }

.exp-role {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
}

.exp-company {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}
.exp-company a { color: var(--text-muted); }
.exp-company a:hover { color: var(--accent); text-decoration: none; }

.exp-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ─── Tech Stack (inline in Experience) ─────────────── */
.tech-inline {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tech-row {
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 0.85rem;
}

.tech-label {
  flex-shrink: 0;
  width: 80px;
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.tech-chips {
  color: var(--text-muted);
  line-height: 1.6;
}

/* ─── Publications ───────────────────────────────────── */

/* Selected work (featured papers with abstracts) */
.sel-pub-list {
  display: flex;
  flex-direction: column;
  margin-bottom: 48px;
}

.sel-entry {
  display: flex;
  gap: 22px;
  padding: 28px 0;
  border-bottom: 1px solid var(--border-subtle);
}
.sel-entry:first-child { padding-top: 0; }
.sel-entry:last-child { border-bottom: none; }

.sel-thumb {
  flex-shrink: 0;
  width: 140px;
  height: auto;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: #fff;
  padding: 4px;
  align-self: flex-start;
  display: block;
}
[data-theme="dark"] .sel-thumb { opacity: 0.88; }

.sel-content { flex: 1; min-width: 0; }

.sel-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.45;
  margin-bottom: 4px;
}

.sel-authors {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 2px;
}
.sel-authors strong { color: var(--text); font-weight: 600; }

.sel-venue {
  font-size: 0.82rem;
  color: var(--text-faint);
  font-style: italic;
  margin-bottom: 10px;
}

.sel-abstract {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 12px;
}

.sel-links { display: flex; flex-wrap: wrap; gap: 5px; }

/* All-publications divider label */
.all-pubs-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
  padding-top: 28px;
  margin-bottom: 16px;
  border-top: 1px solid var(--border);
}

/* Compact annotated list */
.pub-compact-list {
  display: flex;
  flex-direction: column;
}

.pub-year-group { margin-bottom: 28px; }

.pub-year-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-subtle);
}

.pub-entries { display: flex; flex-direction: column; gap: 0; }

.pub-entry {
  padding: 12px 0;
  border-bottom: 1px solid var(--border-subtle);
}
.pub-entry:last-child { border-bottom: none; }

.pub-entry-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.45;
  margin-bottom: 3px;
}

.pub-entry-authors {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 2px;
}
.pub-entry-authors strong { color: var(--text); font-weight: 600; }

.pub-entry-venue {
  font-size: 0.82rem;
  color: var(--text-faint);
  font-style: italic;
  margin-bottom: 6px;
}

.pub-entry-links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-items: center;
}

.pub-inline-link {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  padding: 1px 7px;
  border: 1px solid currentColor;
  border-radius: 3px;
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
  background: transparent;
  font-family: inherit;
  cursor: pointer;
  line-height: 1.6;
}
.pub-inline-link:hover { background: var(--accent); color: #fff; text-decoration: none; }

.pub-badge-patent {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-faint);
  padding: 1px 6px;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--bg-alt);
}

.no-results, .loading-state {
  font-size: 0.875rem;
  color: var(--text-muted);
  padding: 20px 0;
}

/* ─── Contact ────────────────────────────────────────── */
.contact-wrap {
  max-width: 520px;
}

.contact-text {
  font-size: 0.93rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.contact-email {
  display: block;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 16px;
  word-break: break-all;
  text-decoration: none;
}
.contact-email:hover { color: var(--accent); text-decoration: underline; }

.contact-socials {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 0.87rem;
}
.contact-socials a { color: var(--text-muted); text-decoration: none; }
.contact-socials a:hover { color: var(--accent); }
.contact-socials span { color: var(--text-faint); }

/* ─── Footer ─────────────────────────────────────────── */
.site-footer {
  padding: 28px 0;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg);
}
.site-footer p {
  font-size: 0.8rem;
  color: var(--text-faint);
  text-align: center;
}

/* ─── BibTeX Modal ───────────────────────────────────── */
.bib-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 200;
}
.bib-overlay.open { display: block; }

.bib-modal {
  display: none;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 201;
  width: min(560px, calc(100vw - 32px));
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: 0 16px 48px rgba(0,0,0,0.2);
}
.bib-modal.open { display: block; }

.bib-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
}

.bib-modal-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
}

.bib-modal-close {
  font-size: 1.2rem;
  color: var(--text-muted);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}
.bib-modal-close:hover { color: var(--text); background: var(--bg-alt); }

.bib-code {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.6;
  padding: 16px 18px;
  max-height: 260px;
  overflow-y: auto;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
}

.bib-copy-btn {
  display: block;
  width: calc(100% - 36px);
  margin: 0 18px 14px;
  padding: 8px;
  font-size: 0.85rem;
  font-weight: 500;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.bib-copy-btn:hover { background: var(--accent-hover); }

/* ─── Responsive ─────────────────────────────────────── */
@media (max-width: 640px) {
  :root { --section-pad: 52px; }

  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    padding: 8px 0;
    border-top: 1px solid var(--border-subtle);
    gap: 0;
    order: 3;
  }
  .nav-links.open { display: flex; }
  .nav-link { padding: 8px 0; width: 100%; }

  .nav-hamburger { display: flex; }
  .nav { flex-wrap: wrap; height: auto; padding: 0 0 4px; min-height: var(--nav-height); }
  .nav-name { padding: var(--nav-height)/2 0; line-height: var(--nav-height); height: var(--nav-height); }
  .nav-actions { height: var(--nav-height); }

  .about-grid { flex-direction: column; gap: 20px; }
  .about-photo { width: 96px; height: 96px; }

  .exp-item { flex-direction: column; gap: 4px; }
  .exp-meta { width: auto; }

  .sel-entry { flex-direction: column; gap: 12px; }
  .sel-thumb { width: 100%; max-width: 240px; }

  .tech-row { flex-direction: column; gap: 4px; }
  .tech-label { width: auto; }
}

@media (max-width: 480px) {
  .social-links { gap: 8px; }
  .social-link { font-size: 0.8rem; padding: 4px 10px; }
  .about-name { font-size: 1.45rem; }
}

/* ─── Blog ───────────────────────────────────────────── */

/* Blog listing page */
.blog-list { display: flex; flex-direction: column; gap: 0; }

.blog-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  gap: 20px;
  align-items: baseline;
}
.blog-item:last-child { border-bottom: none; }

.blog-item-date {
  flex-shrink: 0;
  font-size: 0.78rem;
  color: var(--text-faint);
  font-weight: 500;
  width: 90px;
}

.blog-item-content { flex: 1; }

.blog-item-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  line-height: 1.4;
  display: block;
  margin-bottom: 3px;
}
.blog-item-title:hover { color: var(--accent); text-decoration: none; }

.blog-item-excerpt {
  font-size: 0.83rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 5px;
}

.blog-item-tags { display: flex; gap: 5px; }

.blog-tag {
  font-size: 0.72rem;
  padding: 1px 7px;
  border-radius: var(--radius-pill);
  background: var(--bg-alt);
  color: var(--text-faint);
  border: 1px solid var(--border);
}

/* Individual blog post */
.blog-post {
  padding-top: 48px;
  padding-bottom: 80px;
}

.post-back {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.83rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  text-decoration: none;
}
.post-back:hover { color: var(--accent); text-decoration: none; }

.post-header { margin-bottom: 36px; }

.post-title {
  font-size: 1.65rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  line-height: 1.25;
  margin-bottom: 10px;
}

.post-meta {
  font-size: 0.83rem;
  color: var(--text-faint);
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.post-body {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text);
}

.post-body p { margin-bottom: 1.1em; }

.post-body h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 2em 0 0.6em;
  color: var(--text);
  letter-spacing: -0.01em;
}

.post-body h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 1.6em 0 0.5em;
  color: var(--text);
}

.post-body h4 {
  font-size: 0.93rem;
  font-weight: 600;
  margin: 1.4em 0 0.4em;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.post-body ul, .post-body ol {
  margin: 0.6em 0 1em 1.4em;
  list-style: disc;
}
.post-body ol { list-style: decimal; }
.post-body li { margin-bottom: 0.3em; }

.post-body a { color: var(--accent); text-decoration: underline; }
.post-body a:hover { color: var(--accent-hover); }

.post-body strong { font-weight: 600; }
.post-body em { font-style: italic; color: var(--text-muted); }

.post-body code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg-alt);
  padding: 1px 5px;
  border-radius: 3px;
  border: 1px solid var(--border);
}

.post-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2em 0;
}

.post-body blockquote {
  border-left: 3px solid var(--accent);
  padding: 4px 0 4px 16px;
  margin: 1em 0;
  color: var(--text-muted);
  font-style: italic;
}

.post-references {
  margin-top: 2.5em;
  padding-top: 1.5em;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-muted);
}
.post-references h3 { font-size: 0.9rem; margin-bottom: 0.8em; }
.post-references ol { margin-left: 1.2em; }
.post-references li { margin-bottom: 0.4em; }
.post-references a { color: var(--accent); }