/* ============================================================
   Advaitha.ai — Design System
   Modern, corporate, Silicon Valley tech-startup aesthetic.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');

/* ---- Theme tokens -------------------------------------------------------- */
:root {
  /* Warm paper canvas — #faf9f5 / #f0eee6 / #e3dacc / #141413 */
  --bg: #faf9f5;
  --bg-soft: #f0eee6;
  --surface-2: #e3dacc;
  --text: #141413;
  --text-muted: #6b6357;
  --border: #e3dacc;
  --accent: #686762;
  --accent-2: #7c3aed;
  --accent-3: #c026d3;
  --ring: rgba(20, 20, 19, 0.10);
  /* Crisp, highly diffused shadows for tactile depth (not glow) */
  --shadow-sm: 0 1px 2px rgba(20, 20, 19, 0.05), 0 1px 3px rgba(20, 20, 19, 0.03);
  --shadow-md: 0 8px 28px -14px rgba(20, 20, 19, 0.14), 0 2px 6px rgba(20, 20, 19, 0.03);
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif;
  font-feature-settings: 'cv11', 'ss01';
  letter-spacing: -0.011em;
}

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

/* ---- Brand mark ---------------------------------------------------------- */
.brand-dot {
  color: var(--accent);
}

/* Wordmark logo — multiply drops its near-white backdrop on the paper header */
.brand-logo {
  mix-blend-mode: multiply;
}

/* ---- Gradient text ------------------------------------------------------- */
.gradient-text {
  color: var(--accent);
}

/* ---- Buttons ------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.9rem;
  line-height: 1;
  border-radius: 9999px;
  padding: 0.7rem 1.25rem;
  transition: transform 0.18s ease, box-shadow 0.25s ease, background 0.25s ease,
    border-color 0.25s ease, color 0.2s ease;
  white-space: nowrap;
  cursor: pointer;
}

.btn-primary {
  color: #fff;
  background: var(--accent);
  box-shadow: var(--shadow-sm);
  border: 1px solid transparent;
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  color: var(--text);
  background: transparent;
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  transform: translateY(-1px);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
  box-shadow: var(--shadow-sm);
}

/* ---- Pill badge ---------------------------------------------------------- */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.35rem 0.8rem;
  border-radius: 9999px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--accent) 7%, transparent);
  color: var(--accent);
}
.pill .dot {
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 9999px;
  background: var(--accent);
}

/* ---- Cards --------------------------------------------------------------- */
.card {
  position: relative;
  border: 1px solid var(--border);
  border-radius: 1.25rem;
  background: var(--bg);
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  overflow: hidden;
}
.card:hover {
  transform: translateY(-3px);
  border-color: #d4c9b5;
  box-shadow: var(--shadow-md);
}

/* Icon tile */
.icon-tile {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 0.85rem;
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border: 1px solid var(--border);
  color: var(--accent);
}

/* ---- Background: faint structural grid (no ambient color) --------------- */
.grid-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(20, 20, 19, 0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(20, 20, 19, 0.035) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse 90% 55% at 50% 0%, #000 28%, transparent 80%);
  mask-image: radial-gradient(ellipse 90% 55% at 50% 0%, #000 28%, transparent 80%);
  opacity: 0.7;
}

/* ---- Reveal on scroll ---------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}
.reveal.in {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---- Marquee (logo / value strip) --------------------------------------- */
.marquee {
  display: flex;
  gap: 3rem;
  width: max-content;
  animation: scroll-x 48s linear infinite;
}
.marquee:hover { animation-play-state: paused; }
@keyframes scroll-x {
  to { transform: translateX(-50%); }
}
@media (prefers-reduced-motion: reduce) {
  .marquee { animation: none; }
}

/* ---- Pipeline / build-stage indicator ----------------------------------- */
.pipeline { margin-top: auto; padding-top: 1.4rem; }
.pipeline-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.55rem;
}
.pipeline-head .lbl {
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.pipeline-stage {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  padding: 0.18rem 0.6rem;
  border-radius: 9999px;
  color: #fff;
  background: var(--accent);
}
.pipeline-stage::before {
  content: '';
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 9999px;
  background: #fff;
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.4);
}
.pipeline-track {
  display: flex;
  gap: 0.28rem;
}
.pipeline-seg {
  flex: 1;
  height: 0.32rem;
  border-radius: 9999px;
  background: var(--border);
  transition: background 0.3s ease;
}
.pipeline-seg.done {
  background: var(--accent);
}
.pipeline-seg.current {
  background: var(--accent);
}
.pipeline-ticks {
  display: flex;
  justify-content: space-between;
  margin-top: 0.45rem;
  font-size: 0.56rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* Compact stage chip (home preview cards) */
.stage-chip {
  flex-shrink: 0;
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.18rem 0.55rem;
  border-radius: 9999px;
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border));
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}

/* ---- Sticky header blur -------------------------------------------------- */
.site-header {
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
}

/* ---- Hamburger icon (3 bars → X) ---------------------------------------- */
.hamburger-btn {
  cursor: pointer;
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  background: none;
  border: none;
}
.hamburger-btn span {
  display: block;
  width: 1.4rem;
  height: 0.125rem;
  border-radius: 2px;
  background-color: currentColor;
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.hamburger-open .bar1 { transform: rotate(45deg) translate(5px, 5px); }
.hamburger-open .bar2 { opacity: 0; }
.hamburger-open .bar3 { transform: rotate(-45deg) translate(5px, -5px); }