/* ================================================
   TUSHAR VERMA — PORTFOLIO
   Fonts: Bricolage Grotesque + Plus Jakarta Sans + JetBrains Mono
   Theme: Light default / Dark IDE (grayscale + solaris green)
   ================================================ */

/* — THEME VARIABLES — */
:root {
  --bg: #fafafa;
  --bg-alt: #f0f0f0;
  --bg-card: #ffffff;
  --border: #e5e5e5;
  --border-hover: #d4d4d4;
  --text: #0a0a0a;
  --text-secondary: #525252;
  --text-muted: #a3a3a3;
  --accent: #16a34a;
  --accent-hover: #15803d;
  --accent-subtle: rgba(22, 163, 74, 0.07);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --nav-bg: rgba(250, 250, 250, 0.82);
  --max-w: 720px;
  --radius: 6px;
}

[data-theme="dark"] {
  --bg: #0a0a0a;
  --bg-alt: #141414;
  --bg-card: #171717;
  --border: #232323;
  --border-hover: #363636;
  --text: #ededed;
  --text-secondary: #a3a3a3;
  --text-muted: #525252;
  --accent: #4ade80;
  --accent-hover: #22c55e;
  --accent-subtle: rgba(74, 222, 128, 0.07);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --nav-bg: rgba(10, 10, 10, 0.82);
}

/* — RESET — */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; -webkit-text-size-adjust: 100%; }

body {
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease;
}

::selection { background: var(--accent); color: #fff; }
[data-theme="dark"] ::selection { color: #0a0a0a; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
button { cursor: pointer; font: inherit; }
a { color: inherit; text-decoration: none; }
strong { font-weight: 600; color: var(--text); }

/* — LAYOUT — */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 1.5rem; }

/* — NAVIGATION — */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav-name {
  font-family: 'Bricolage Grotesque', sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.02em;
  transition: color 0.2s;
}

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

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.1rem;
}

.nav-link {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius);
  transition: color 0.2s, background 0.2s;
}

.nav-link:hover {
  color: var(--text);
  background: var(--bg-alt);
}

.nav-link.active {
  color: var(--text);
  background: var(--bg-alt);
}

.nav-link.resume-link {
  color: var(--accent);
  font-weight: 600;
}

.nav-link.resume-link:hover { background: var(--accent-subtle); }

.nav-divider {
  width: 1px;
  height: 18px;
  background: var(--border);
  margin: 0 0.35rem;
}

/* — THEME TOGGLE — */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: transparent;
  color: var(--text-muted);
  margin-left: 0.25rem;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.theme-toggle:hover {
  color: var(--text);
  border-color: var(--border-hover);
  background: var(--bg-alt);
}

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

/* — HAMBURGER — */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: 6px;
  flex-direction: column;
  gap: 4px;
}

.nav-toggle span {
  display: block;
  width: 16px;
  height: 1.5px;
  background: var(--text);
  border-radius: 1px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav.open .nav-toggle span:first-child {
  transform: rotate(45deg) translate(2px, 2px);
}

.nav.open .nav-toggle span:last-child {
  transform: rotate(-45deg) translate(2px, -2px);
}

/* — PAGE HEADER (sub-pages) — */
.page-header {
  padding: 4rem 0 1.5rem;
}

.page-header h1 {
  font-family: 'Bricolage Grotesque', sans-serif;
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 700;
  color: var(--text);
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
}

.page-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* — HERO — */
.hero {
  padding: 5rem 0 2rem;
}

.hero-title {
  font-family: 'Bricolage Grotesque', sans-serif;
  font-size: clamp(2rem, 4.5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text);
  letter-spacing: -0.03em;
  margin-bottom: 1.75rem;
}

.rotating-text {
  color: var(--accent);
  display: inline-block;
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.hero-intro {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
  max-width: 580px;
  margin-bottom: 2rem;
}

.hero-intro a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 3px;
  transition: text-decoration-color 0.2s;
}

.hero-intro a:hover { text-decoration-color: var(--accent); }

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* — BUTTONS — */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.84rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  padding: 0.55rem 1.3rem;
  border-radius: 100px;
  transition: background 0.2s, transform 0.15s;
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

[data-theme="dark"] .btn-primary { color: #0a0a0a; }

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text);
  padding: 0.55rem 1.3rem;
  border: 1px solid var(--border);
  border-radius: 100px;
  transition: border-color 0.2s, background 0.2s;
}

.btn-outline:hover {
  border-color: var(--border-hover);
  background: var(--bg-alt);
}

.link-arrow {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: gap 0.2s;
}

.link-arrow:hover { gap: 0.5rem; }

/* — SECTIONS — */
.section {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
}

.section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

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

.section-body p { margin-bottom: 1rem; }
.section-body p:last-child { margin-bottom: 0; }

.section-body a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 3px;
  transition: text-decoration-color 0.2s;
}

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

/* — TAGS — */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 1rem 0 0.75rem;
}

.tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  padding: 0.22rem 0.65rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-secondary);
  transition: background 0.2s, border-color 0.2s;
}

.exploring-note {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 0.75rem;
}

/* — HIGHLIGHT ROWS (home featured work) — */
.highlight-row {
  display: block;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--border);
  transition: padding-left 0.2s;
}

.highlight-row:first-child { padding-top: 0; }
.highlight-row:last-child { border-bottom: none; }
.highlight-row:hover { padding-left: 0.5rem; }

.highlight-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 0.25rem;
}

.highlight-row h3 {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  transition: color 0.2s;
}

.highlight-row:hover h3 { color: var(--accent); }

.highlight-meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

.highlight-row p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* — PAPER ROWS (home compact) — */
.paper-row {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--border);
  transition: padding-left 0.2s, color 0.2s;
}

.paper-row:last-child { border-bottom: none; }
.paper-row:hover { padding-left: 0.5rem; color: var(--accent); }

.paper-year {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-shrink: 0;
  min-width: 32px;
}

.paper-name {
  flex: 1;
  font-size: 0.9rem;
  line-height: 1.45;
}

.paper-arrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

/* — CONTACT SECTION — */
.contact-text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 1.5rem;
  max-width: 520px;
}

.contact-social {
  display: flex;
  gap: 1.25rem;
  margin-top: 1.25rem;
}

.contact-social a {
  color: var(--text-muted);
  display: flex;
  align-items: center;
  transition: color 0.2s;
}

.contact-social a:hover { color: var(--accent); }

/* — WORK PAGE: EXPERIENCE — */
.exp-list { padding-top: 1rem; }

.exp {
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
}

.exp:last-child { border-bottom: none; }

.exp-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.exp-org {
  font-family: 'Bricolage Grotesque', sans-serif;
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.02em;
}

.exp-org a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--border);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.2s;
}

.exp-org a:hover { text-decoration-color: var(--text); }

.exp-role {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 0.15rem;
}

.exp-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
  padding-top: 0.35rem;
}

.exp-block { margin-bottom: 1.5rem; }
.exp-block:last-child { margin-bottom: 0; }

.exp-block h3 {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.6rem;
}

.exp-block h3 a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 2px;
  transition: text-decoration-color 0.2s;
}

.exp-block h3 a:hover { text-decoration-color: var(--accent); }

.exp-block ul { padding: 0; }

.exp-block li {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text-secondary);
  padding-left: 1rem;
  position: relative;
  margin-bottom: 0.35rem;
}

.exp-block li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--text-muted);
  font-weight: 700;
}

.exp-block li strong {
  color: var(--text);
  font-weight: 600;
}

.exp-brief {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* — SIDE PROJECTS — */
.side-projects {
  padding: 2.5rem 0 0;
  border-top: 1px solid var(--border);
}

.side-projects .section-label { margin-bottom: 1rem; }

.side-projects-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.side-project {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}

.side-project:last-child { border-bottom: none; }

.side-project h3 {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.side-project h3 a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 2px;
  transition: text-decoration-color 0.2s;
}

.side-project h3 a:hover { text-decoration-color: var(--accent); }

.side-project p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* — PAPERS PAGE — */
.paper-full {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 1.25rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
}

.paper-full:last-child { border-bottom: none; }

.paper-full-year {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: var(--text-muted);
  padding-top: 0.25rem;
}

.paper-full-title {
  font-family: 'Bricolage Grotesque', sans-serif;
  font-size: 1.15rem;
  font-weight: 500;
  line-height: 1.4;
  color: var(--text);
  letter-spacing: -0.01em;
  margin-bottom: 0.4rem;
}

.paper-full-authors {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 0.6rem;
  line-height: 1.55;
}

.paper-full-authors strong { color: var(--accent); }

.paper-full-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.paper-full-links a {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--accent);
  transition: opacity 0.2s;
}

.paper-full-links a:hover { opacity: 0.7; }

.paper-venue {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  background: var(--accent-subtle);
  color: var(--accent);
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
}

/* — BLOG PAGE — */
.post-item {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
  transition: padding-left 0.2s;
}

.post-item:hover { padding-left: 0.5rem; }
.post-item:last-child { border-bottom: none; }

.post-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
  padding-top: 0.2rem;
  white-space: nowrap;
}

.post-title {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
  margin-bottom: 0.3rem;
  transition: color 0.2s;
}

.post-item:hover .post-title { color: var(--accent); }

.post-excerpt {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.blog-empty {
  padding: 3rem 0;
  text-align: center;
}

.blog-empty p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.blog-empty a { color: var(--accent); }

/* — BLOG POST PAGE — */
.post-header {
  padding: 4rem 0 2rem;
}

.post-back {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-bottom: 1.5rem;
  transition: color 0.2s;
}

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

.post-header h1 {
  font-family: 'Bricolage Grotesque', sans-serif;
  font-size: clamp(1.75rem, 4.5vw, 2.25rem);
  font-weight: 700;
  color: var(--text);
  line-height: 1.25;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
}

.post-meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.post-content {
  padding-bottom: 3rem;
}

.post-content h2 {
  font-family: 'Bricolage Grotesque', sans-serif;
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.02em;
  margin: 2.5rem 0 0.75rem;
}

.post-content h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  margin: 2rem 0 0.5rem;
}

.post-content p {
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.post-content p:last-child { margin-bottom: 0; }

.post-content a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 3px;
  transition: text-decoration-color 0.2s;
}

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

.post-content strong { color: var(--text); }

.post-content ul, .post-content ol {
  padding-left: 1.25rem;
  margin-bottom: 1.25rem;
}

.post-content li {
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
  list-style: disc;
}

.post-content ol li { list-style: decimal; }

.post-content code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  padding: 0.12rem 0.4rem;
  border-radius: 3px;
  color: var(--accent);
}

.post-content pre {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin-bottom: 1.25rem;
}

.post-content pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.post-content blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.5rem 0 0.5rem 1.25rem;
  margin: 1.5rem 0;
}

.post-content blockquote p {
  font-style: italic;
  color: var(--text-secondary);
}

.post-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.75rem;
}

/* — FOOTER — */
.footer {
  margin-top: 2rem;
  padding: 2rem 0;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-left {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--text-muted);
}

.footer-icons {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.footer-icons a {
  color: var(--text-muted);
  display: flex;
  align-items: center;
  transition: color 0.2s;
}

.footer-icons a:hover { color: var(--accent); }

/* — FOCUS — */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 3px;
}

/* — RESPONSIVE — */
@media (max-width: 640px) {
  .nav-toggle { display: flex; }

  .nav-right {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 1rem 1.5rem 1.25rem;
    flex-direction: column;
    gap: 0.5rem;
    box-shadow: var(--shadow-md);
  }

  .nav-right.active { display: flex; }

  .nav-links {
    flex-direction: column;
    gap: 0.1rem;
  }

  .nav-link { padding: 0.5rem 0.65rem; }

  .nav-divider { display: none; }

  .theme-toggle {
    align-self: flex-start;
    margin-top: 0.5rem;
    margin-left: 0;
  }

  .hero { padding: 3rem 0 1.5rem; }
  .hero-title { font-size: clamp(1.85rem, 7vw, 2.75rem); }

  .page-header { padding: 3rem 0 1.25rem; }

  .highlight-top { flex-direction: column; gap: 0.1rem; }
  .exp-top { flex-direction: column; gap: 0.15rem; }

  .paper-row { flex-direction: column; gap: 0.15rem; }
  .paper-arrow { display: none; }

  .paper-full {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .paper-full-year { margin-bottom: 0.25rem; }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
}