/* ============================================================
   SastaSpace — Mohit Khare portfolio
   Design: dark-first, editorial typography, teal→violet duotone
   ============================================================ */

:root {
  /* Palette — dark (default) */
  --bg: #0a0c12;
  --bg-soft: #0e1119;
  --bg-alt: #0c0f17;
  --surface: #12161f;
  --surface-2: #161b26;
  --border: #1f2632;
  --border-strong: #2c3543;

  --text: #eef1f6;
  --text-soft: #c4ccd8;
  --muted: #828ea1;
  --faint: #5a6473;

  --accent: #2fe0c4;      /* mint-teal */
  --accent-2: #8b8cf6;    /* periwinkle */
  --accent-ink: #04140f;  /* text on accent */
  --accent-soft: rgba(47, 224, 196, 0.12);
  --accent-line: rgba(47, 224, 196, 0.28);
  --gold: #f1c453;

  --grad: linear-gradient(110deg, var(--accent) 0%, #5fe6d6 45%, var(--accent-2) 100%);
  --glow-1: rgba(47, 224, 196, 0.16);
  --glow-2: rgba(139, 140, 246, 0.14);

  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --display: "Space Grotesk", var(--font);
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --radius: 16px;
  --radius-sm: 10px;
  --max: 1120px;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.35), 0 18px 40px -24px rgba(0, 0, 0, 0.7);
  --shadow-lift: 0 1px 2px rgba(0, 0, 0, 0.4), 0 28px 60px -28px rgba(0, 0, 0, 0.75);
}

html[data-theme="light"] {
  --bg: #f6f7fb;
  --bg-soft: #ffffff;
  --bg-alt: #eef1f7;
  --surface: #ffffff;
  --surface-2: #f3f5fa;
  --border: #e1e6ef;
  --border-strong: #ccd4e0;

  --text: #11151c;
  --text-soft: #2f3a48;
  --muted: #5b6675;
  --faint: #8a94a3;

  --accent: #0fae93;
  --accent-2: #6366f1;
  --accent-ink: #ffffff;
  --accent-soft: rgba(15, 174, 147, 0.10);
  --accent-line: rgba(15, 174, 147, 0.30);
  --gold: #b8860b;

  --grad: linear-gradient(110deg, #0fae93 0%, #14b8a6 45%, #6366f1 100%);
  --glow-1: rgba(15, 174, 147, 0.12);
  --glow-2: rgba(99, 102, 241, 0.10);

  --shadow: 0 1px 2px rgba(20, 30, 50, 0.06), 0 16px 40px -28px rgba(20, 30, 50, 0.35);
  --shadow-lift: 0 1px 2px rgba(20, 30, 50, 0.08), 0 26px 56px -30px rgba(20, 30, 50, 0.45);
}

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

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 70% 50% at 50% -10%, var(--glow-1), transparent 60%),
    radial-gradient(ellipse 50% 40% at 100% 5%, var(--glow-2), transparent 55%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

a { color: var(--accent); }

::selection { background: var(--accent); color: var(--accent-ink); }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: 0.6rem 1rem;
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: 0 0 8px 0;
  z-index: 200;
  font-weight: 600;
}
.skip-link:focus { left: 0; top: 0; }

.container { width: min(100% - 2.5rem, var(--max)); margin-inline: auto; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ============================ Header ============================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 0;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--text);
  margin-right: auto;
}

.logo-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 9px;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: -0.02em;
  color: var(--accent-ink);
  background: var(--grad);
  box-shadow: 0 6px 18px -8px var(--glow-1);
}

.logo-text {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 1.02rem;
  letter-spacing: -0.02em;
}
.logo-text span { color: var(--accent); }

.primary-nav { display: flex; align-items: center; gap: 1.5rem; }

.primary-nav a {
  position: relative;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.18s ease;
}
.primary-nav a:not(.nav-cta)::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 100%;
  height: 1.5px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.22s ease;
}
.primary-nav a:not(.nav-cta):hover { color: var(--text); }
.primary-nav a:not(.nav-cta):hover::after { transform: scaleX(1); }

.nav-cta {
  color: var(--text) !important;
  padding: 0.45rem 1rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  transition: border-color 0.18s ease, background 0.18s ease, color 0.18s ease;
}
.nav-cta:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent) !important;
}

.theme-toggle {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text-soft);
  cursor: pointer;
  transition: border-color 0.18s ease, color 0.18s ease, transform 0.12s ease;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.theme-toggle:active { transform: scale(0.94); }

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

@media (max-width: 720px) {
  .primary-nav a:not(.nav-cta) { display: none; }
  .primary-nav { gap: 0.75rem; }
}

/* ============================ Buttons ============================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.72rem 1.3rem;
  border-radius: 10px;
  font-family: var(--font);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease, color 0.18s ease;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  color: var(--accent-ink);
  background: var(--grad);
  border: 1px solid transparent;
  box-shadow: 0 10px 28px -12px var(--glow-1);
}
.btn-primary:hover { box-shadow: 0 14px 34px -10px var(--glow-1); transform: translateY(-2px); }

.btn-ghost {
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border-strong);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

/* ============================ Hero ============================ */
.hero { padding: clamp(3.5rem, 9vw, 6.5rem) 0 clamp(2.5rem, 6vw, 4rem); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-soft);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  margin: 0 0 1.6rem;
}
.eyebrow .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 var(--accent);
  animation: pulse 2.4s ease-out infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 var(--accent-line); }
  70% { box-shadow: 0 0 0 8px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

.hero-name {
  font-family: var(--display);
  font-size: clamp(3rem, 9vw, 5.75rem);
  font-weight: 600;
  line-height: 0.98;
  letter-spacing: -0.04em;
  margin: 0 0 1.1rem;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  width: fit-content;
}

.hero-title {
  font-family: var(--display);
  font-size: clamp(1.35rem, 3.6vw, 2.1rem);
  font-weight: 500;
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--text);
  margin: 0 0 1.4rem;
  max-width: 22ch;
}
.hero-title em {
  font-style: normal;
  color: var(--accent);
}

.hero-lead {
  color: var(--text-soft);
  max-width: 62ch;
  font-size: 1.075rem;
  margin: 0 0 2rem;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }

.br-desktop { display: none; }
@media (min-width: 720px) { .br-desktop { display: inline; } }

/* Stat strip */
.stat-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(2.5rem, 6vw, 4rem) 0 0;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
@media (min-width: 560px) { .stat-strip { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 900px) { .stat-strip { grid-template-columns: repeat(4, 1fr); } }

.stat {
  margin: 0;
  padding: 1.5rem 1.5rem;
  background: var(--surface);
  transition: background 0.2s ease;
}
.stat:hover { background: var(--surface-2); }

.stat-value {
  font-family: var(--mono);
  font-size: clamp(2.2rem, 5vw, 2.9rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.03em;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat-value .unit { font-size: 0.55em; }
.stat-value .unit.pre { margin-right: 0.02em; }

.stat-label {
  display: block;
  margin: 0.7rem 0 0;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
}
.stat-sub {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--muted);
}

/* ============================ Sections ============================ */
.section { padding: clamp(3.5rem, 8vw, 6rem) 0; }

.section-alt {
  background: var(--bg-alt);
  border-block: 1px solid var(--border);
}

.section-head { max-width: 60ch; margin: 0 0 clamp(2rem, 5vw, 3rem); }

.kicker {
  font-family: var(--mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin: 0 0 0.85rem;
}

.section-title {
  font-family: var(--display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.025em;
  margin: 0 0 0.85rem;
  color: var(--text);
}

.section-intro {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0;
}

/* ============================ Work grid ============================ */
.work-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
}
@media (min-width: 640px) { .work-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .work-grid { grid-template-columns: repeat(3, 1fr); } }

.work-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem 1.6rem 1.7rem;
  overflow: hidden;
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}
.work-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--grad);
  opacity: 0;
  transition: opacity 0.22s ease;
}
.work-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-lift);
}
.work-card:hover::before { opacity: 1; }

.work-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.1rem;
}

.work-tag {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.work-num {
  font-family: var(--mono);
  font-size: 1.55rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--accent);
  white-space: nowrap;
}
.work-num .num-unit { font-size: 0.55em; color: var(--muted); }

.work-card h3 {
  font-family: var(--display);
  font-size: 1.18rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 0.6rem;
  color: var(--text);
}

.work-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
}
.work-card strong { color: var(--text); font-weight: 600; }

/* ============================ Timeline ============================ */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.timeline-item {
  position: relative;
  padding: 0 0 2.5rem 2rem;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.5rem;
  bottom: -0.5rem;
  width: 2px;
  background: linear-gradient(var(--border-strong), transparent);
}
.timeline-item:last-child::before { display: none; }

.timeline-marker {
  position: absolute;
  left: 0;
  top: 0.45rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-alt);
  border: 2px solid var(--accent);
  box-shadow: 0 0 0 4px var(--bg-alt), 0 0 14px -2px var(--accent);
  transition: background 0.22s ease, transform 0.22s ease;
}
.timeline-item:hover .timeline-marker { background: var(--accent); transform: scale(1.15); }

.timeline-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 1rem;
  margin-bottom: 0.45rem;
}
.timeline-co {
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.01em;
}
.timeline-when { font-size: 0.85rem; color: var(--muted); }

.timeline-role {
  font-family: var(--display);
  font-size: 1.22rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 0.7rem;
  color: var(--text);
}

.timeline-points {
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
  font-size: 0.97rem;
}
.timeline-points li {
  position: relative;
  padding-left: 1.4rem;
  margin-bottom: 0.5rem;
}
.timeline-points li::before {
  content: "";
  position: absolute;
  left: 0.1rem;
  top: 0.65em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-2);
}
.timeline-points strong { color: var(--text); font-weight: 600; }

/* ============================ Projects ============================ */
.project-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
}
@media (min-width: 760px) {
  .project-grid { grid-template-columns: repeat(2, 1fr); }
  .project-card--feature { grid-column: 1 / -1; }
}
@media (min-width: 1000px) {
  .project-grid { grid-template-columns: repeat(3, 1fr); }
  .project-card--feature { grid-column: span 1; grid-row: span 1; }
}

.project-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.7rem 1.7rem 1.6rem;
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}
.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-lift);
}
.project-card--feature {
  background:
    radial-gradient(ellipse 80% 120% at 0% 0%, var(--accent-soft), transparent 60%),
    var(--surface);
}

.project-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}
.project-head h3 {
  font-family: var(--display);
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--text);
}

.tag {
  font-family: var(--mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.28rem 0.6rem;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--accent-line);
  white-space: nowrap;
}
.tag--gold {
  background: color-mix(in srgb, var(--gold) 14%, transparent);
  color: var(--gold);
  border-color: color-mix(in srgb, var(--gold) 38%, transparent);
}

.project-desc {
  margin: 0 0 1.2rem;
  color: var(--muted);
  font-size: 0.97rem;
}
.project-desc strong { color: var(--text); font-weight: 600; }

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  list-style: none;
  margin: auto 0 0;
  padding: 0;
}
.chip-row li {
  font-family: var(--mono);
  font-size: 0.76rem;
  padding: 0.32rem 0.7rem;
  border-radius: 999px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-soft);
}

.project-links {
  display: flex;
  gap: 1.2rem;
  margin-top: 1.2rem;
}
.project-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.92rem;
  text-decoration: none;
}
.project-links a:hover { text-decoration: underline; }

/* ============================ Skills ============================ */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
}
@media (min-width: 600px) { .skills-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .skills-grid { grid-template-columns: repeat(3, 1fr); } }

.skill-group {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1.4rem 1.5rem;
  transition: border-color 0.2s ease;
}
.skill-group:hover { border-color: var(--border-strong); }

.skill-group-title {
  font-family: var(--mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin: 0 0 1rem;
}

.skill-group .chip-row { margin: 0; }

.skill-group--edu { display: flex; flex-direction: column; }
.edu-line {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.97rem;
}
.edu-line strong { color: var(--text); }

/* ============================ Contact ============================ */
.contact { padding-bottom: clamp(4rem, 9vw, 7rem); }

.contact-card {
  position: relative;
  text-align: center;
  max-width: 720px;
  margin-inline: auto;
  padding: clamp(2.5rem, 6vw, 4rem) clamp(1.5rem, 5vw, 3.5rem);
  background:
    radial-gradient(ellipse 90% 130% at 50% 0%, var(--accent-soft), transparent 65%),
    var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: calc(var(--radius) + 6px);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.contact-card .kicker { text-align: center; }
.contact-card .section-title { margin-bottom: 1rem; }

.contact-lead {
  color: var(--text-soft);
  max-width: 52ch;
  margin: 0 auto 2rem;
}
.contact-card .hero-actions { justify-content: center; }

/* ============================ Footer ============================ */
.site-footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
  background: var(--bg-alt);
}
.footer-inner { text-align: center; font-size: 0.9rem; color: var(--muted); }
.footer-inner p { margin: 0.25rem 0; }

.footer-brand {
  font-family: var(--mono);
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-soft);
  margin-bottom: 0.5rem !important;
}
.footer-brand span { color: var(--accent); }

.footer-note { font-size: 0.82rem; color: var(--faint); }

/* ============================ Reveal motion ============================ */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1), transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.is-visible { opacity: 1; transform: none; }

/* stagger children within a grid a touch */
.work-card.reveal:nth-child(2) { transition-delay: 0.05s; }
.work-card.reveal:nth-child(3) { transition-delay: 0.1s; }
.work-card.reveal:nth-child(5) { transition-delay: 0.05s; }
.work-card.reveal:nth-child(6) { transition-delay: 0.1s; }
.project-card.reveal:nth-child(2) { transition-delay: 0.06s; }
.project-card.reveal:nth-child(3) { transition-delay: 0.12s; }

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