/*
  Blue Kite Tax UI refinement
  Append after the current styles.css so these rules win the cascade.
  Scope: service cards, audience cards, process accordion, and mobile menu.
*/

:root {
  --bk-blue: #0d52ff;
  --bk-blue-deep: #0644db;
  --bk-navy: #000921;
  --bk-surface: #ffffff;
  --bk-surface-soft: #f7f7f8;
  --bk-line: rgba(0, 47, 167, 0.14);
  --bk-line-strong: rgba(0, 47, 167, 0.24);
  --bk-glass: rgba(255, 255, 255, 0.86);
  --bk-glass-strong: rgba(255, 255, 255, 0.88);
  --bk-muted: #5f6674;
  --bk-radius: 16px;
  --bk-shadow: 0 24px 64px rgba(0, 9, 33, 0.10),
    0 6px 18px rgba(0, 9, 33, 0.05);
  --bk-ease: cubic-bezier(0.16, 1, 0.3, 1);
}

::selection {
  color: #ffffff;
  background: var(--bk-blue);
}

:where(a, button, input, textarea, select):focus-visible {
  outline: 2px solid var(--bk-blue);
  outline-offset: 4px;
}

/* Shared glass material: precise edge, real depth, no decorative halo. */
.feature-grid,
.process-content,
.audience-cards {
  border: 1px solid var(--bk-line);
  border-radius: var(--bk-radius);
  background: linear-gradient(
    145deg,
    rgba(255, 255, 255, 0.92),
    rgba(255, 255, 255, 0.68)
  );
  box-shadow: var(--bk-shadow);
  -webkit-backdrop-filter: blur(24px) saturate(1.08);
  backdrop-filter: blur(24px) saturate(1.08);
}

/* Services: one composed ledger panel instead of six floating cards. */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  overflow: hidden;
}

.feature-card {
  min-width: 0;
  padding: clamp(26px, 3vw, 40px);
  border: 0;
  border-right: 1px solid var(--bk-line);
  border-bottom: 1px solid var(--bk-line);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  transition:
    background-color 220ms var(--bk-ease),
    color 220ms var(--bk-ease);
}

.feature-card:nth-child(3n) {
  border-right: 0;
}

.feature-card:nth-last-child(-n + 3) {
  border-bottom: 0;
}

.feature-card:hover {
  background: rgba(13, 82, 255, 0.045);
}

.feature-card h3 {
  margin: 0 0 14px;
  color: var(--bk-navy);
  font-size: clamp(19px, 1.65vw, 24px);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.2;
}

.feature-card p {
  max-width: 38ch;
  margin: 0;
  color: var(--bk-muted);
  line-height: 1.65;
}

.feature-icon {
  width: 38px;
  height: 38px;
  margin: 0 0 28px;
  border: 1px solid var(--bk-line);
  border-radius: 12px;
  color: var(--bk-blue);
  background: rgba(255, 255, 255, 0.76);
  box-shadow: 0 8px 18px rgba(0, 9, 33, 0.06);
}

/* Audience cards: retain the glass panel, remove nested ghost-card styling. */
.audience-cards {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  overflow: hidden;
  padding: 0;
}

.audience-cards > li {
  min-width: 0;
  padding: clamp(26px, 3vw, 40px);
  border: 0;
  border-right: 1px solid var(--bk-line);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  transition: background-color 220ms var(--bk-ease);
}

.audience-cards > li:last-child {
  border-right: 0;
}

.audience-cards > li:hover {
  background: rgba(13, 82, 255, 0.045);
}

.audience-cards h3 {
  color: var(--bk-navy);
  font-size: clamp(19px, 1.55vw, 23px);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.2;
}

.audience-cards p {
  color: var(--bk-muted);
  line-height: 1.65;
}

/* How We Work: quieter tabs and a single coherent accordion surface. */
.process-content {
  overflow: hidden;
  padding: clamp(22px, 2.5vw, 34px);
}

.audience-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--bk-line);
  border-radius: 12px;
  background: rgba(247, 247, 248, 0.78);
  box-shadow: none;
}

.audience-tabs [role="tab"] {
  min-height: 46px;
  border: 0;
  border-radius: 9px;
  color: var(--bk-muted);
  background: transparent;
  box-shadow: none;
  transition:
    color 180ms var(--bk-ease),
    background-color 180ms var(--bk-ease),
    box-shadow 180ms var(--bk-ease);
}

.audience-tabs [role="tab"][aria-selected="true"] {
  color: #ffffff;
  background: var(--bk-blue);
  box-shadow: 0 8px 20px rgba(13, 82, 255, 0.22);
}

.process-summary {
  margin-block: 30px 16px;
  color: var(--bk-navy);
  font-weight: 700;
}

.process-flow {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--bk-line);
}

.solution-item {
  border-bottom: 1px solid var(--bk-line);
  background: transparent;
  transition: background-color 180ms var(--bk-ease);
}

.solution-item:has(.solution-trigger[aria-expanded="true"]) {
  background: rgba(13, 82, 255, 0.045);
}

.process-step-title {
  margin: 0;
}

.solution-trigger {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 24px;
  align-items: center;
  width: 100%;
  min-height: 74px;
  gap: 16px;
  padding: 0 16px;
  border: 0;
  color: var(--bk-navy);
  background: transparent;
  text-align: left;
}

.solution-trigger:hover {
  color: var(--bk-blue);
}

.solution-index {
  color: var(--bk-blue);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.solution-title {
  font-size: clamp(18px, 1.7vw, 23px);
  font-weight: 500;
  letter-spacing: -0.025em;
}

.solution-reveal-inner,
.solution-detail {
  color: var(--bk-muted);
  line-height: 1.65;
}

.solution-reveal-inner {
  padding: 0 56px 26px 76px;
}

/* Mobile navigation: a lighter, clearer glass sheet with explicit rows. */
@media (max-width: 780px) {
  .site-header .menu {
    min-width: 72px;
    min-height: 44px;
    border: 1px solid var(--bk-line);
    border-radius: 12px;
    color: var(--bk-navy);
    background: var(--bk-glass-strong);
    box-shadow: 0 8px 22px rgba(0, 9, 33, 0.07);
    -webkit-backdrop-filter: blur(18px) saturate(1.08);
    backdrop-filter: blur(18px) saturate(1.08);
  }

  .menu-line nav {
    overflow: hidden;
    border: 1px solid var(--bk-line-strong);
    border-radius: var(--bk-radius);
    background: var(--bk-glass);
    box-shadow: var(--bk-shadow);
    -webkit-backdrop-filter: blur(28px) saturate(1.1);
    backdrop-filter: blur(28px) saturate(1.1);
  }

  .menu-line nav a {
    display: flex;
    align-items: center;
    min-height: 58px;
    margin: 0;
    padding: 0 20px;
    border-bottom: 1px solid var(--bk-line);
    color: var(--bk-navy);
    font-weight: 600;
    text-decoration: none;
  }

  .menu-line nav a:last-child {
    border-bottom: 0;
  }

  .menu-line nav a:hover,
  .menu-line nav a:focus-visible {
    color: var(--bk-blue);
    background: rgba(13, 82, 255, 0.05);
  }

  .feature-grid,
  .audience-cards {
    grid-template-columns: 1fr;
  }

  .feature-card,
  .feature-card:nth-child(3n),
  .feature-card:nth-last-child(-n + 3),
  .audience-cards > li,
  .audience-cards > li:last-child {
    border-right: 0;
    border-bottom: 1px solid var(--bk-line);
  }

  .feature-card:last-child,
  .audience-cards > li:last-child {
    border-bottom: 0;
  }

  .feature-card,
  .audience-cards > li {
    padding: 28px 24px;
  }

  .feature-icon {
    margin-bottom: 22px;
  }

  .process-content {
    padding: 18px;
  }

  .audience-tabs {
    grid-template-columns: 1fr;
  }

  .solution-trigger {
    grid-template-columns: 36px minmax(0, 1fr) 20px;
    gap: 12px;
    min-height: 68px;
    padding-inline: 10px;
  }

  .solution-reveal-inner {
    padding: 0 10px 24px 58px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .feature-card,
  .audience-cards > li,
  .audience-tabs [role="tab"],
  .solution-item,
  .solution-trigger {
    transition-duration: 0.01ms;
  }
}