/* ==========================================================================
   Vipin Gupta profile site: dark theme
   Colours are tokens on :root. Change the palette here only.
   ========================================================================== */

:root {
  color-scheme: dark;
  --bg: #0B0F14;
  --bg-raised: #111820;
  --surface: #151E28;
  --surface-2: #1B2633;
  --border: #243243;
  --text: #E8EDF3;
  --text-muted: #A3B1BF;   /* about 8.5:1 on --bg */
  --accent: #2EC4B6;       /* muted teal, used sparingly */
  --accent-strong: #5EEAD4;
  --accent-ink: #04201D;   /* text on accent fills */
  --shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
  --shadow-soft: 0 6px 18px rgba(0, 0, 0, 0.25);
  --radius: 14px;
  --radius-sm: 999px;
  --focus: 0 0 0 3px rgba(46, 196, 182, 0.55);
  --max: 1080px;
  --gutter: clamp(16px, 4vw, 32px);
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent-strong); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: #A7F3E8; }
:focus-visible { outline: none; box-shadow: var(--focus); border-radius: 6px; }
h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 0.5em; font-weight: 600; letter-spacing: -0.02em; }
p { margin: 0 0 1em; }
ul, ol { margin: 0; padding: 0; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
.main { padding-top: 28px; padding-bottom: 64px; min-height: 60vh; }

.skip-link {
  position: absolute; left: 16px; top: -48px; z-index: 100;
  background: var(--accent); color: var(--accent-ink); padding: 8px 14px; border-radius: 8px; font-weight: 600;
}
.skip-link:focus { top: 12px; }

.notice { color: var(--text-muted); border: 1px solid var(--border); padding: 16px; border-radius: var(--radius); }

/* ----- Header and tabs --------------------------------------------------- */

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11, 15, 20, 0.92);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.site-header__inner { display: flex; align-items: center; padding-top: 14px; padding-bottom: 10px; }

.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; }
.brand:hover { color: var(--text); }
.brand__mark {
  display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px;
  background: var(--surface-2); border: 1px solid var(--border); color: var(--accent);
  font-weight: 700; font-size: 0.8rem; letter-spacing: 0.04em;
}
.brand__name { font-weight: 600; letter-spacing: -0.01em; }

.site-nav .container { padding-top: 0; }
.tablist {
  display: flex; gap: 4px;
  overflow-x: auto; overscroll-behavior-x: contain;
  scroll-snap-type: x proximity; -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding-bottom: 0;
}
.tablist::-webkit-scrollbar { display: none; }

.tab {
  position: relative; flex: 0 0 auto; scroll-snap-align: start;
  appearance: none; background: none; border: 0; cursor: pointer;
  padding: 12px 14px 14px; font: inherit; font-size: 0.92rem; font-weight: 500;
  color: var(--text-muted); white-space: nowrap;
  transition: color 180ms ease;
  border-radius: 8px 8px 0 0;
}
.tab:hover { color: var(--text); }
.tab::after {
  content: ""; position: absolute; left: 12px; right: 12px; bottom: 0; height: 2px;
  background: var(--accent); border-radius: 2px;
  transform: scaleX(0); transform-origin: center; transition: transform 220ms ease;
}
.tab[aria-selected="true"] { color: var(--text); }
.tab[aria-selected="true"]::after { transform: scaleX(1); }
.tab:focus-visible { box-shadow: inset 0 0 0 2px rgba(46, 196, 182, 0.55); }

/* ----- Tab panel transition ----------------------------------------------- */

.tabpanel { outline: none; }
.tabpanel.is-entering { animation: panel-in 260ms ease both; }
@keyframes panel-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

.section-head { margin-bottom: 24px; }
.section-head h2 { font-size: clamp(1.6rem, 3.2vw, 2.1rem); margin-bottom: 6px; }
.section-head p { color: var(--text-muted); margin: 0; max-width: 62ch; }
.eyebrow { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--accent); font-weight: 600; margin: 0 0 8px; }

/* ----- Cards and buttons --------------------------------------------------- */

.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px 22px; box-shadow: var(--shadow-soft);
  transition: transform 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
}
.card:hover { transform: translateY(-2px); border-color: rgba(46, 196, 182, 0.45); box-shadow: var(--shadow); }
.card h3 { font-size: 1.08rem; margin-bottom: 4px; }
.card__meta { color: var(--text-muted); font-size: 0.9rem; margin: 0 0 10px; }
.card p { color: var(--text); margin-bottom: 10px; }
.card a.card__link { font-weight: 600; font-size: 0.92rem; }

.grid { display: grid; gap: 18px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .grid--2 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .grid--3 { grid-template-columns: repeat(3, 1fr); } }

.badge {
  display: inline-block; padding: 3px 10px; border-radius: var(--radius-sm);
  font-size: 0.74rem; font-weight: 600; letter-spacing: 0.02em;
  background: var(--surface-2); color: var(--text-muted); border: 1px solid var(--border);
  margin-right: 6px; margin-bottom: 6px;
}
.badge--accent { background: rgba(46, 196, 182, 0.12); color: var(--accent-strong); border-color: rgba(46, 196, 182, 0.35); }
.badge--muted { color: var(--text-muted); }

.chip-list { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; }
.chip-list li {
  padding: 6px 12px; border-radius: var(--radius-sm); background: var(--surface-2);
  border: 1px solid var(--border); font-size: 0.9rem; color: var(--text);
}

.btn {
  display: inline-flex; align-items: center; gap: 8px; justify-content: center;
  padding: 10px 16px; border-radius: 10px; font: inherit; font-weight: 600; font-size: 0.92rem;
  text-decoration: none; cursor: pointer; border: 1px solid transparent;
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease, transform 180ms ease;
}
.btn--primary { background: var(--accent); color: var(--accent-ink); }
.btn--primary:hover { background: var(--accent-strong); color: var(--accent-ink); transform: translateY(-1px); }
.btn--ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent-strong); }
.btn svg { width: 16px; height: 16px; flex: 0 0 auto; }

/* ----- Overview ----------------------------------------------------------- */

.hero {
  display: grid; gap: 28px; align-items: center;
  padding: 28px 0 36px;
}
@media (min-width: 720px) { .hero { grid-template-columns: auto 1fr; gap: 44px; padding: 44px 0 48px; } }

.headshot-wrap {
  position: relative; width: 168px; height: 168px; margin: 0 auto;
}
@media (min-width: 720px) { .headshot-wrap { width: 200px; height: 200px; margin: 0; } }
.headshot {
  width: 100%; height: 100%; border-radius: 50%; object-fit: cover;
  border: 2px solid rgba(46, 196, 182, 0.55); box-shadow: var(--shadow);
  background: var(--surface-2);
}
.headshot-fallback {
  display: none; position: absolute; inset: 0; border-radius: 50%;
  place-items: center; background: var(--surface-2); border: 2px dashed var(--border);
  color: var(--accent); font-weight: 700; font-size: 2rem; letter-spacing: 0.04em;
}
.headshot-wrap.is-missing .headshot-fallback { display: grid; }
.headshot-wrap.is-missing .headshot { visibility: hidden; }

.hero__name { font-size: clamp(2.2rem, 5vw, 3.4rem); margin-bottom: 4px; }
.hero__title { font-size: 1.15rem; color: var(--accent-strong); font-weight: 500; margin-bottom: 10px; }
.hero__tagline { font-size: 1.12rem; color: var(--text); margin-bottom: 16px; max-width: 58ch; }
.hero__bio p { color: var(--text-muted); max-width: 66ch; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.hero__text { text-align: left; }
@media (max-width: 719px) { .hero__text { text-align: center; } .hero__actions { justify-content: center; } }

.stats { list-style: none; display: grid; gap: 14px; grid-template-columns: repeat(2, 1fr); margin: 8px 0 36px; }
@media (min-width: 900px) { .stats { grid-template-columns: repeat(4, 1fr); } }
.stat-card { text-align: left; }
.stat-card__value {
  display: block; font-size: 2.1rem; font-weight: 700; color: var(--text); letter-spacing: -0.02em; line-height: 1.1;
}
.stat-card__label { color: var(--text-muted); font-size: 0.9rem; }

.contact-block { display: flex; flex-wrap: wrap; gap: 10px; }

/* ----- Experience timeline ------------------------------------------------- */

.timeline { list-style: none; position: relative; padding-left: 26px; }
.timeline::before {
  content: ""; position: absolute; left: 6px; top: 8px; bottom: 8px; width: 2px;
  background: linear-gradient(var(--accent), var(--border));
}
.timeline__item { position: relative; margin-bottom: 22px; }
.timeline__dot {
  position: absolute; left: -26px; top: 26px; width: 14px; height: 14px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--accent);
}
.timeline__item .card { padding: 20px 22px; }
.timeline__dates { color: var(--accent-strong); font-size: 0.86rem; font-weight: 600; margin-bottom: 4px; }
.timeline ul { list-style: none; margin-top: 12px; }
.timeline li.bullet { position: relative; padding-left: 18px; margin-bottom: 6px; color: var(--text-muted); }
.timeline li.bullet::before { content: ""; position: absolute; left: 0; top: 0.7em; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); opacity: 0.8; }

/* ----- Filters ------------------------------------------------------------- */

.filters { display: flex; flex-wrap: wrap; gap: 12px; align-items: end; margin-bottom: 20px; }
.field { display: grid; gap: 6px; }
.field label { font-size: 0.8rem; color: var(--text-muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; }
select {
  appearance: none; font: inherit; font-size: 0.95rem; color: var(--text);
  background: var(--surface-2) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%23A3B1BF' stroke-width='1.6'/%3E%3C/svg%3E") no-repeat right 12px center;
  border: 1px solid var(--border); border-radius: 10px; padding: 9px 36px 9px 12px; min-width: 180px; cursor: pointer;
}
select:hover { border-color: rgba(46, 196, 182, 0.5); }
.filter-count { color: var(--text-muted); font-size: 0.9rem; margin: 0 0 14px; }
.empty { color: var(--text-muted); border: 1px dashed var(--border); border-radius: var(--radius); padding: 20px; }

/* ----- Media / speaking list rows ----------------------------------------- */

.stack { display: grid; gap: 14px; }
.stack .card { display: grid; gap: 4px; }

/* ----- Summary ------------------------------------------------------------- */

.prose { max-width: 70ch; }
.prose p { color: var(--text); font-size: 1.05rem; }
.subhead { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--text-muted); font-weight: 600; margin: 32px 0 14px; }
.skills { display: grid; gap: 16px; grid-template-columns: 1fr; }
@media (min-width: 720px) { .skills { grid-template-columns: repeat(2, 1fr); } }
.skill-group h3 { font-size: 1rem; margin-bottom: 10px; color: var(--accent-strong); }

/* ----- Documents and achievements ---------------------------------------- */

.doc-card { display: flex; flex-direction: column; gap: 8px; }
.doc-card .btn { margin-top: auto; align-self: flex-start; }
.achievements { list-style: none; border-left: 2px solid var(--border); padding-left: 20px; }
.achievements li { position: relative; padding: 10px 0; border-bottom: 1px solid rgba(36, 50, 67, 0.6); }
.achievements li:last-child { border-bottom: 0; }
.achievements li::before {
  content: ""; position: absolute; left: -27px; top: 17px; width: 10px; height: 10px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--accent);
}
.achievements__date { color: var(--accent-strong); font-size: 0.86rem; font-weight: 600; margin-right: 10px; }

/* ----- Footer --------------------------------------------------------------- */

.site-footer { border-top: 1px solid var(--border); background: var(--bg-raised); color: var(--text-muted); font-size: 0.88rem; }
.site-footer__inner { padding-top: 24px; padding-bottom: 28px; display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; }
.site-footer p { margin: 0; }
.site-footer__links a { margin-left: 16px; color: var(--text-muted); }
.site-footer__links a:hover { color: var(--text); }

/* ----- Small screens ------------------------------------------------------- */

@media (max-width: 600px) {
  .tab { padding: 11px 12px 13px; font-size: 0.88rem; }
  .card { padding: 18px; }
  .filters select { min-width: 0; flex: 1 1 140px; }
  .timeline { padding-left: 22px; }
  .timeline__dot { left: -22px; }
}

/* ----- Motion preference --------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .card:hover { transform: none; }
}