/* ============================================================
   susmithagurram.com — design system
   Tokens first: change colors/fonts here to retheme everything.
   ============================================================ */

:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --surface-2: #f3f1ea;
  --text: #16202e;
  --muted: #5a6678;
  --accent: #0e7c6b;
  --accent-strong: #0a5f52;
  --accent-soft: rgba(14, 124, 107, 0.1);
  --border: #e6e3d9;
  --shadow: 0 1px 2px rgba(22, 32, 46, 0.05), 0 8px 24px rgba(22, 32, 46, 0.07);
  --shadow-lift: 0 2px 4px rgba(22, 32, 46, 0.06), 0 16px 40px rgba(22, 32, 46, 0.12);

  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  --radius: 14px;
  --radius-sm: 8px;
  --maxw: 1080px;
}

[data-theme="dark"] {
  --bg: #0e1420;
  --surface: #161e2d;
  --surface-2: #1c2638;
  --text: #eceff4;
  --muted: #93a0b4;
  --accent: #34c3a6;
  --accent-strong: #5fd8c0;
  --accent-soft: rgba(52, 195, 166, 0.13);
  --border: #243047;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lift: 0 2px 4px rgba(0, 0, 0, 0.35), 0 16px 40px rgba(0, 0, 0, 0.5);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s ease, color 0.3s ease;
}

img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

::selection { background: var(--accent-soft); }

/* ---------- skip link ---------- */
.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: #fff; padding: 0.6rem 1rem;
  border-radius: 0 0 var(--radius-sm) 0; z-index: 100;
}
.skip-link:focus { left: 0; }

/* ---------- header / nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; align-items: center; gap: 1rem;
  padding: 0.7rem 1.25rem;
}

.brand {
  font-family: var(--font-display);
  font-weight: 600; font-size: 1.12rem;
  color: var(--text); white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.brand-accent { color: var(--accent); }

.nav-tabs {
  display: flex; gap: 0.15rem; margin-left: auto;
  overflow-x: auto; scrollbar-width: none;
}
.nav-tabs::-webkit-scrollbar { display: none; }

.nav-tab {
  padding: 0.45rem 0.85rem;
  font-size: 0.92rem; font-weight: 500;
  color: var(--muted);
  border-radius: 999px;
  white-space: nowrap;
  transition: color 0.15s, background 0.15s;
}
.nav-tab:hover { color: var(--text); text-decoration: none; background: var(--surface-2); }
.nav-tab.active { color: var(--accent-strong); background: var(--accent-soft); }

.theme-toggle {
  flex-shrink: 0;
  border: 1px solid var(--border); background: var(--surface);
  color: var(--muted); cursor: pointer;
  width: 36px; height: 36px; border-radius: 50%;
  display: grid; place-items: center;
  transition: color 0.15s, border-color 0.15s;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }
[data-theme="dark"] .icon-moon { display: none; }
:not([data-theme="dark"]) > body .icon-sun,
html:not([data-theme="dark"]) .icon-sun { display: none; }
[data-theme="dark"] .icon-sun { display: block; }

/* ---------- draft banner ---------- */
#draft-banner {
  background: #fff3cd; color: #6e5a16;
  border-bottom: 1px solid #e6d9a8;
  text-align: center; font-size: 0.84rem;
  padding: 0.45rem 1rem;
}
#draft-banner a { color: inherit; font-weight: 600; text-decoration: underline; }
[data-theme="dark"] #draft-banner { background: #3a3215; color: #e8d48a; border-color: #57491c; }

/* ---------- layout ---------- */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
  min-height: 70vh;
}

.section { margin-bottom: 3.5rem; }

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
  margin-bottom: 1.4rem;
  display: flex; align-items: baseline; gap: 0.75rem;
}
.section-title::after {
  content: ""; flex: 1; height: 1px; background: var(--border);
  transform: translateY(-4px);
}

/* ---------- hero ---------- */
.hero {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 3rem; align-items: center;
  padding: 2.5rem 0 3.5rem;
}

.hero-kicker {
  font-family: var(--font-mono); font-size: 0.82rem;
  color: var(--accent); letter-spacing: 0.08em;
  text-transform: uppercase; margin-bottom: 0.9rem;
}

.hero-name {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 3.8rem);
  font-weight: 700; line-height: 1.08;
  margin-bottom: 1rem;
}

.hero-tagline {
  font-size: 1.12rem; color: var(--muted);
  max-width: 34rem; margin-bottom: 1.8rem;
}

.hero-ctas { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-bottom: 1.6rem; }

.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.65rem 1.3rem;
  border-radius: 999px;
  font-weight: 600; font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer; transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-strong); box-shadow: var(--shadow); color: #fff; }
[data-theme="dark"] .btn-primary { color: #0e1420; }
.btn-ghost { border-color: var(--border); color: var(--text); background: var(--surface); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.hero-socials { display: flex; gap: 0.6rem; }
.social-link {
  width: 38px; height: 38px; border-radius: 50%;
  border: 1px solid var(--border); background: var(--surface);
  display: grid; place-items: center; color: var(--muted);
  transition: color 0.15s, border-color 0.15s, transform 0.15s;
}
.social-link:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-2px); }

.hero-photo-wrap { position: relative; justify-self: center; }
.hero-photo {
  width: clamp(200px, 24vw, 280px); height: clamp(200px, 24vw, 280px);
  border-radius: 50%; object-fit: cover;
  border: 4px solid var(--surface);
  box-shadow: var(--shadow-lift);
  position: relative; z-index: 1;
}
.hero-photo-wrap::before {
  content: ""; position: absolute; inset: -14px;
  border-radius: 50%;
  border: 1.5px dashed var(--accent);
  opacity: 0.45;
  animation: spin 40s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.hero-interests { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-top: 0.4rem; }

/* ---------- chips / tags ---------- */
.chip {
  font-family: var(--font-mono); font-size: 0.74rem;
  padding: 0.28rem 0.7rem; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent-strong);
  white-space: nowrap;
}
.chip-outline { background: transparent; border: 1px solid var(--border); color: var(--muted); }

/* ---------- about ---------- */
.about-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 2.5rem; }
.about-bio p { margin-bottom: 1rem; color: var(--text); }
.about-facts {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.4rem; box-shadow: var(--shadow);
  align-self: start;
}
.about-facts h3 {
  font-family: var(--font-mono); font-size: 0.78rem; font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted);
  margin-bottom: 0.9rem;
}
.fact { display: flex; gap: 0.6rem; margin-bottom: 0.7rem; font-size: 0.92rem; align-items: baseline; }
.fact-icon { color: var(--accent); flex-shrink: 0; }

/* ---------- cards (projects) ---------- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.4rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  display: flex; flex-direction: column;
}
.card:hover, .card:focus-visible {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lift);
  border-color: var(--accent);
}

.card-image { aspect-ratio: 16/8.5; object-fit: cover; width: 100%; background: var(--surface-2); }
.card-body { padding: 1.15rem 1.25rem 1.3rem; display: flex; flex-direction: column; gap: 0.6rem; flex: 1; }
.card-status {
  font-family: var(--font-mono); font-size: 0.7rem;
  color: var(--accent); letter-spacing: 0.05em; text-transform: uppercase;
}
.card-title { font-family: var(--font-display); font-size: 1.18rem; font-weight: 600; line-height: 1.3; }
.card-hook { color: var(--muted); font-size: 0.93rem; flex: 1; }
.card-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.3rem; }
.card-more {
  font-size: 0.85rem; font-weight: 600; color: var(--accent);
  margin-top: 0.5rem;
}

/* ---------- timeline (experience / education) ---------- */
.timeline { position: relative; padding-left: 1.6rem; }
.timeline::before {
  content: ""; position: absolute; left: 5px; top: 6px; bottom: 6px;
  width: 2px; background: var(--border);
}
.timeline-item { position: relative; padding-bottom: 2.2rem; }
.timeline-item:last-child { padding-bottom: 0.5rem; }
.timeline-item::before {
  content: ""; position: absolute; left: -1.6rem; top: 7px;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--accent); border: 2.5px solid var(--bg);
  box-shadow: 0 0 0 2px var(--accent-soft);
}

.tl-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.3rem 0.8rem; margin-bottom: 0.2rem; }
.tl-role { font-family: var(--font-display); font-size: 1.15rem; font-weight: 600; }
.tl-org { color: var(--accent-strong); font-weight: 600; font-size: 0.97rem; }
.tl-meta { font-family: var(--font-mono); font-size: 0.78rem; color: var(--muted); margin-bottom: 0.55rem; }
.tl-summary { color: var(--muted); font-style: italic; font-size: 0.93rem; margin-bottom: 0.55rem; }
.tl-bullets { padding-left: 1.1rem; display: grid; gap: 0.4rem; font-size: 0.94rem; }
.tl-bullets li::marker { color: var(--accent); }
.tl-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.7rem; }

/* ---------- publications ---------- */
.pub-list { display: grid; gap: 1.1rem; }
.pub {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.3rem 1.5rem;
  box-shadow: var(--shadow);
}
.pub-top { display: flex; align-items: flex-start; gap: 1rem; }
.pub-title { font-family: var(--font-display); font-size: 1.1rem; font-weight: 600; line-height: 1.35; flex: 1; }
.pub-status {
  font-family: var(--font-mono); font-size: 0.7rem; white-space: nowrap;
  padding: 0.25rem 0.65rem; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent-strong);
}
.pub-status.published { background: rgba(46, 160, 67, 0.12); color: #2ea043; }
.pub-authors { font-size: 0.9rem; color: var(--muted); margin-top: 0.35rem; }
.pub-venue { font-size: 0.9rem; margin-top: 0.2rem; font-style: italic; }
.pub-note { font-size: 0.9rem; color: var(--muted); margin-top: 0.55rem; }
.pub-links { margin-top: 0.7rem; display: flex; gap: 0.9rem; font-size: 0.86rem; font-weight: 600; }

/* ---------- skills ---------- */
.skills-grid { display: grid; gap: 1.3rem; }
.skill-group-name {
  font-family: var(--font-mono); font-size: 0.78rem; font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted);
  margin-bottom: 0.55rem;
}
.skill-chips { display: flex; flex-wrap: wrap; gap: 0.45rem; }

/* ---------- awards ---------- */
.awards-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.2rem; }
.award {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem 1.4rem; box-shadow: var(--shadow);
}
.award-title { font-weight: 600; font-size: 1rem; margin-bottom: 0.25rem; }
.award-meta { font-family: var(--font-mono); font-size: 0.76rem; color: var(--accent); margin-bottom: 0.5rem; }
.award-desc { font-size: 0.9rem; color: var(--muted); }

/* ---------- news ---------- */
.news-list { display: grid; gap: 0.2rem; }
.news-item {
  display: grid; grid-template-columns: 92px 1fr; gap: 1.2rem;
  padding: 0.9rem 0.4rem; border-bottom: 1px solid var(--border);
}
.news-item:last-child { border-bottom: none; }
.news-date { font-family: var(--font-mono); font-size: 0.8rem; color: var(--accent); padding-top: 0.15rem; }
.news-title { font-weight: 600; }
.news-body { font-size: 0.92rem; color: var(--muted); margin-top: 0.15rem; }
.news-more { margin-top: 0.8rem; font-weight: 600; font-size: 0.9rem; }

/* ---------- text section ---------- */
.text-block { max-width: 46rem; }
.text-block p { margin-bottom: 1rem; }

/* ---------- contact ---------- */
.contact-wrap { display: grid; grid-template-columns: 1fr 1.2fr; gap: 2.5rem; align-items: start; }
.contact-blurb p { margin-bottom: 1rem; color: var(--muted); }

.contact-form {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.6rem; box-shadow: var(--shadow);
  display: grid; gap: 1rem;
}
.form-field { display: grid; gap: 0.35rem; }
.form-field label { font-size: 0.85rem; font-weight: 600; }
.form-field input, .form-field textarea {
  font-family: var(--font-body); font-size: 0.95rem;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--bg); color: var(--text);
  transition: border-color 0.15s;
}
.form-field input:focus, .form-field textarea:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.form-status { font-size: 0.9rem; min-height: 1.4rem; }
.form-status.ok { color: #2ea043; }
.form-status.err { color: #d1242f; }

/* ---------- modal ---------- */
.modal-backdrop[hidden] { display: none; }
.modal-backdrop {
  position: fixed; inset: 0; z-index: 90;
  background: rgba(10, 14, 22, 0.55);
  backdrop-filter: blur(4px);
  display: grid; place-items: center; padding: 1.5rem;
}
.modal {
  background: var(--surface); border-radius: var(--radius);
  max-width: 680px; width: 100%; max-height: 85vh; overflow-y: auto;
  position: relative; box-shadow: var(--shadow-lift);
  border: 1px solid var(--border);
}
.modal-close {
  position: sticky; top: 0.7rem; margin-left: calc(100% - 3rem);
  width: 34px; height: 34px; border-radius: 50%;
  border: 1px solid var(--border); background: var(--surface);
  color: var(--muted); font-size: 1.25rem; cursor: pointer; z-index: 2;
}
.modal-close:hover { color: var(--text); border-color: var(--accent); }
.modal-body { padding: 0 2rem 2rem; margin-top: -1.5rem; }
.modal-body img { border-radius: var(--radius-sm); margin-bottom: 1.2rem; }
.modal-body h2 { font-family: var(--font-display); margin-bottom: 0.6rem; }
.modal-body .card-tags { margin: 0.8rem 0 1rem; }
.modal-body p { margin-bottom: 0.9rem; }
.modal-links { display: flex; gap: 1rem; margin-top: 1.2rem; font-weight: 600; }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.6rem 1.25rem;
  text-align: center; font-size: 0.85rem; color: var(--muted);
}

/* ---------- loading ---------- */
.loading { display: flex; gap: 0.5rem; justify-content: center; padding: 5rem 0; }
.loading-dot {
  width: 9px; height: 9px; border-radius: 50%; background: var(--accent);
  animation: pulse 1.2s ease-in-out infinite;
}
.loading-dot:nth-child(2) { animation-delay: 0.18s; }
.loading-dot:nth-child(3) { animation-delay: 0.36s; }
@keyframes pulse { 0%, 100% { opacity: 0.25; transform: scale(0.85); } 50% { opacity: 1; transform: scale(1.1); } }

/* ---------- reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.55s ease, transform 0.55s ease; }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-photo-wrap::before { animation: none; }
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}

/* ---------- responsive ---------- */
@media (max-width: 840px) {
  .hero { grid-template-columns: 1fr; gap: 2rem; padding-top: 1rem; text-align: center; }
  .hero-photo-wrap { order: -1; }
  .hero-tagline { margin-left: auto; margin-right: auto; }
  .hero-ctas, .hero-socials, .hero-interests { justify-content: center; }
  .about-grid, .contact-wrap { grid-template-columns: 1fr; gap: 1.6rem; }
  .nav {
    padding: 0.6rem 1rem; gap: 0.6rem;
    flex-wrap: wrap;
  }
  .brand { font-size: 1rem; }
  /* tabs drop to their own full-width, scrollable row */
  .nav-tabs {
    order: 3;
    flex-basis: 100%;
    margin-left: 0;
    padding-bottom: 2px;
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x proximity;
    -webkit-mask-image: linear-gradient(to right, transparent 0, #000 12px, #000 calc(100% - 16px), transparent 100%);
    mask-image: linear-gradient(to right, transparent 0, #000 12px, #000 calc(100% - 16px), transparent 100%);
  }
  .nav-tab { scroll-snap-align: start; }
}

@media (max-width: 480px) {
  .news-item { grid-template-columns: 1fr; gap: 0.15rem; }
  .modal-body { padding: 0 1.25rem 1.5rem; }
}

/* ---------- print (clean CV-style output) ---------- */
@media print {
  .site-header, .site-footer, .theme-toggle, .hero-ctas, .contact-form, .modal-backdrop { display: none !important; }
  body { background: #fff; color: #000; }
  .card, .pub, .award, .about-facts { box-shadow: none; border: 1px solid #ccc; }
  .reveal { opacity: 1; transform: none; }
}