/**
 * SAININ SYSTEMS — ANIMATED LIQUID FLUID GLASS NAVBAR STYLES
 * High-end architectural floating liquid glass navbar with single shared active black pill.
 * Features luminous optical backdrop blur, specular refraction bevels, and uniform premium aesthetics.
 */

:root {
  --nav-glass-bg: rgba(255, 255, 255, 0.82);
  --nav-glass-bg-scrolled: rgba(255, 255, 255, 0.92);
  --nav-glass-border: rgba(255, 255, 255, 0.7);
  --nav-glass-border-scrolled: rgba(255, 255, 255, 0.85);
  --nav-text-inactive: #0B0F13;
  --nav-text-active: #FFFFFF;
  --nav-pill-bg: #080B0D;
  --nav-track-bg: rgba(0, 0, 0, 0.035);
  --nav-cta-bg: rgba(0, 0, 0, 0.045);
  --nav-cta-border: rgba(0, 0, 0, 0.09);
  --nav-brand-text: #080B0D;
  --nav-brand-green: #00C878;
}

/* 1. Floating Wrapper: Fixed across entire viewport so it follows every section */
.sainin-nav-wrapper {
  position: fixed;
  top: calc(clamp(0.6rem, 1.8vw, 1.2rem) + env(safe-area-inset-top, 0px));
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9000; /* Floats smoothly above cards and canvases */
  pointer-events: none; /* Allows click-through outside the pill */
  padding: 0 calc(0.75rem + env(safe-area-inset-right, 0px)) 0 calc(0.75rem + env(safe-area-inset-left, 0px));
  box-sizing: border-box;
}

/* 2. Fluid Transparent Glass Pill Container */
.sainin-navbar {
  pointer-events: auto;
  position: relative;
  display: inline-flex;
  align-items: center;
  background: var(--nav-glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--nav-glass-border);
  border-radius: 9999px;
  padding: 4px 6px 4px 8px;
  box-shadow: 
    0 8px 30px -4px rgba(0, 0, 0, 0.08),
    0 2px 6px rgba(0, 0, 0, 0.03),
    inset 0 1px 0.5px rgba(255, 255, 255, 0.95);
  transition: 
    background 300ms ease,
    border-color 300ms ease,
    box-shadow 300ms ease,
    transform 300ms ease;
  will-change: background, box-shadow;
  max-width: 96vw;
  overflow: visible;
}

/* Specular curved gloss sheen overlay (mimics real liquid lens reflection) */
.sainin-navbar::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.35) 0%, rgba(255, 255, 255, 0.04) 50%, transparent 100%);
  pointer-events: none;
  z-index: 0;
}

/* Elevation when user scrolls down */
.sainin-navbar.is-scrolled {
  background: var(--nav-glass-bg-scrolled);
  border-color: var(--nav-glass-border-scrolled);
  box-shadow: 
    0 12px 36px -4px rgba(0, 0, 0, 0.12),
    0 3px 8px rgba(0, 0, 0, 0.04),
    inset 0 1px 0.5px rgba(255, 255, 255, 1);
}

/* Background-corresponding state: When floating over dark sections (Hero bloom, Selected Work, Footer, Book a Meeting) */
.sainin-navbar.is-on-dark {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(24px) saturate(190%);
  -webkit-backdrop-filter: blur(24px) saturate(190%);
  border-color: rgba(255, 255, 255, 0.75);
  box-shadow: 
    0 12px 36px -4px rgba(0, 0, 0, 0.35),
    0 2px 8px rgba(0, 0, 0, 0.18),
    inset 0 1px 0.5px rgba(255, 255, 255, 0.95);
}

.sainin-nav-inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: clamp(0.4rem, 1.2vw, 0.9rem);
}

/* 3. Brand Wordmark & Logo (Left) */
.sainin-nav-brand {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-family: Manrope, Arial, sans-serif;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  color: var(--nav-brand-text);
  text-decoration: none;
  padding: 0.35rem 0.65rem 0.35rem 0.45rem;
  white-space: nowrap;
  border-radius: 9999px;
  transition: opacity 180ms ease, background 180ms ease;
  user-select: none;
}

.sainin-nav-logo {
  height: 20px;
  width: auto;
  aspect-ratio: 304 / 278;
  object-fit: contain;
  display: inline-block;
  flex-shrink: 0;
  vertical-align: middle;
  transition: transform 240ms cubic-bezier(0.16, 1, 0.3, 1);
}

.sainin-nav-brand:hover .sainin-nav-logo {
  transform: scale(1.08);
}

.sainin-nav-brand span {
  font-size: 0.52em;
  vertical-align: top;
  color: var(--nav-brand-green);
  margin-left: 0.05rem;
}

.sainin-nav-brand:hover {
  opacity: 0.78;
}

/* 4. Single Shared Active Pill Navigation Track (Center) */
.sainin-nav-track {
  position: relative;
  display: flex;
  align-items: center;
  background: var(--nav-track-bg);
  border-radius: 9999px;
  padding: 3px;
  border: 1px solid rgba(0, 0, 0, 0.025);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.035);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

/* The Single Shared Active Pill (Physically Glides Between Items) */
.sainin-active-pill {
  position: absolute;
  top: 3px;
  bottom: 3px;
  left: 0;
  width: 0;
  background: var(--nav-pill-bg);
  border-radius: 9999px;
  pointer-events: none;
  z-index: 1;
  opacity: 0;
  box-shadow: 
    0 3px 10px -1px rgba(8, 11, 13, 0.32),
    0 1px 3px rgba(8, 11, 13, 0.2),
    inset 0 1px 0.5px rgba(255, 255, 255, 0.2);
  /* Butter-smooth physical spring/eased glide */
  transition: 
    transform 380ms cubic-bezier(0.16, 1, 0.3, 1),
    width 380ms cubic-bezier(0.16, 1, 0.3, 1),
    opacity 220ms ease;
  will-change: transform, width;
}

/* Nav Item Labels */
.sainin-nav-item {
  position: relative;
  z-index: 2; /* Floats above the black active pill */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.42rem clamp(0.7rem, 1.1vw, 1.05rem);
  font-family: Manrope, Arial, sans-serif;
  font-size: 0.79rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--nav-text-inactive);
  text-decoration: none;
  border-radius: 9999px;
  white-space: nowrap;
  user-select: none;
  /* Synchronized text transition */
  transition: 
    color 320ms cubic-bezier(0.16, 1, 0.3, 1),
    background 180ms ease,
    opacity 180ms ease;
}

/* Inactive Hover */
.sainin-nav-item:hover:not(.is-active) {
  color: #000000;
  background: rgba(0, 0, 0, 0.045);
}

/* Active Item (Text becomes clean white) */
.sainin-nav-item.is-active {
  color: var(--nav-text-active);
}

/* Accessible focus ring */
.sainin-nav-item:focus-visible,
.sainin-nav-brand:focus-visible,
.sainin-nav-cta:focus-visible {
  outline: 2px solid var(--nav-brand-green);
  outline-offset: 2px;
}

/* 5. Distinct Primary CTA (Right) */
.sainin-nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.38rem;
  padding: 0.42rem clamp(0.75rem, 1.2vw, 1.15rem);
  border-radius: 9999px;
  font-family: Manrope, Arial, sans-serif;
  font-size: 0.77rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--nav-brand-text);
  background: var(--nav-cta-bg);
  border: 1px solid var(--nav-cta-border);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
  transition: 
    background 180ms ease,
    border-color 180ms ease,
    transform 180ms ease,
    box-shadow 180ms ease;
}

.sainin-cta-label-mobile {
  display: none;
}

.sainin-cta-label-desktop {
  display: inline;
}

.sainin-nav-cta svg {
  transition: transform 180ms ease;
}

.sainin-nav-cta:hover {
  background: rgba(0, 0, 0, 0.08);
  border-color: rgba(0, 0, 0, 0.16);
  transform: translateY(-1px);
  box-shadow: 0 3px 12px rgba(0, 0, 0, 0.07);
}

.sainin-nav-cta:hover svg {
  transform: translate(2px, -2px);
}

.sainin-nav-cta.is-back:hover svg {
  transform: translateX(-2px);
}

/* 6. Mobile Toggle & Drawer Navigation (Responsive) */
.sainin-nav-mobile-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  min-width: 38px;
  min-height: 38px;
  border-radius: 50%;
  border: 1px solid rgba(0, 0, 0, 0.08);
  background: rgba(0, 0, 0, 0.04);
  color: var(--nav-brand-text);
  cursor: pointer;
  padding: 0;
  transition: background 180ms ease, transform 180ms ease;
  touch-action: manipulation;
}

.sainin-nav-mobile-toggle:hover {
  background: rgba(0, 0, 0, 0.08);
}

.sainin-nav-mobile-toggle:active {
  transform: scale(0.95);
}

.sainin-nav-mobile-drawer {
  display: none;
}

/* Breakpoint for Mobile & Compact Screens */
@media (max-width: 860px) {
  .sainin-nav-track {
    display: none; /* Hidden on narrow bar, exposed via clean mobile drawer */
  }

  .sainin-nav-mobile-toggle {
    display: flex;
  }

  .sainin-navbar {
    padding: 4px 8px;
  }

  .sainin-nav-inner {
    gap: 0.5rem;
  }

  /* Expandable Mobile Fluid Glass Drawer */
  .sainin-nav-wrapper {
    flex-direction: column;
    align-items: center;
  }

  .sainin-nav-mobile-drawer {
    display: flex;
    flex-direction: column;
    position: relative;
    margin-top: 8px;
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.8);
    border-radius: 20px;
    padding: 8px;
    width: min(92vw, 360px);
    box-shadow: 
      0 16px 48px -4px rgba(0, 0, 0, 0.18),
      0 4px 12px rgba(0, 0, 0, 0.06),
      inset 0 1.5px 1px rgba(255, 255, 255, 0.95);
    pointer-events: auto;
    opacity: 0;
    transform: translateY(-8px) scale(0.98);
    transition: 
      opacity 240ms cubic-bezier(0.16, 1, 0.3, 1),
      transform 240ms cubic-bezier(0.16, 1, 0.3, 1),
      background 300ms ease;
    visibility: hidden;
    pointer-events: none;
  }

  .sainin-nav-mobile-drawer.is-on-dark {
    background: rgba(255, 255, 255, 0.92);
    box-shadow: 0 20px 56px -4px rgba(0, 0, 0, 0.45);
  }

  .sainin-nav-mobile-drawer.is-open {
    opacity: 1;
    transform: translateY(0) scale(1);
    visibility: visible;
    pointer-events: auto;
  }

  .sainin-mobile-track {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 4px;
  }

  .sainin-mobile-item {
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 44px; /* Accessible 44px touch target */
    padding: 0.75rem 1.1rem;
    font-family: Manrope, Arial, sans-serif;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--nav-text-inactive);
    text-decoration: none;
    border-radius: 12px;
    transition: color 200ms ease, background 180ms ease;
    box-sizing: border-box;
  }

  .sainin-mobile-item:hover:not(.is-active) {
    background: rgba(0, 0, 0, 0.04);
  }

  .sainin-mobile-item.is-active {
    background: #080B0D;
    color: #FFFFFF;
  }
}

/* Mobile & Compact Phones (< 480px) */
@media (max-width: 480px) {
  .sainin-cta-label-desktop {
    display: none;
  }

  .sainin-cta-label-mobile {
    display: inline;
  }

  .sainin-navbar {
    padding: 3px 6px 3px 8px;
    max-width: calc(100vw - 18px);
  }

  .sainin-nav-inner {
    gap: 0.35rem;
  }

  .sainin-nav-brand {
    font-size: 0.72rem;
    padding: 0.28rem 0.4rem 0.28rem 0.3rem;
    gap: 0.35rem;
    letter-spacing: 0.09em;
  }

  .sainin-nav-logo {
    height: 18px;
    width: auto;
  }

  .sainin-nav-cta {
    padding: 0.34rem 0.6rem;
    font-size: 0.72rem;
    gap: 3px;
  }

  .sainin-nav-mobile-toggle {
    width: 34px;
    height: 34px;
    min-width: 34px;
    min-height: 34px;
  }
}

/* Specific proportional adaptation for compact phones (360px–400px) */
@media (max-width: 400px) {
  .sainin-nav-brand span {
    display: none; /* Hide ® to protect wordmark fit */
  }

  .sainin-nav-brand {
    font-size: 0.7rem;
    padding: 0.25rem 0.35rem;
    letter-spacing: 0.08em;
  }

  .sainin-nav-cta {
    padding: 0.32rem 0.52rem;
    font-size: 0.7rem;
  }
}

/* Minimum 320px screen protection (iPhone SE 1st gen / narrow devices) */
@media (max-width: 350px) {
  .sainin-navbar {
    padding: 3px 4px 3px 6px;
    max-width: calc(100vw - 12px);
  }

  .sainin-nav-inner {
    gap: 0.25rem;
  }

  .sainin-nav-brand {
    font-size: 0.68rem;
    padding: 0.22rem 0.3rem;
    letter-spacing: 0.06em;
    gap: 0.25rem;
  }

  .sainin-nav-logo {
    height: 16px;
  }

  .sainin-nav-cta {
    padding: 0.3rem 0.45rem;
    font-size: 0.66rem;
  }

  .sainin-nav-mobile-toggle {
    width: 32px;
    height: 32px;
    min-width: 32px;
    min-height: 32px;
  }
}

/* Accommodation for Book a Meeting Page */
.intake-page {
  padding-top: clamp(4.5rem, 7.5vw, 5.8rem) !important;
}

.intake-page .intake-navbar {
  display: none !important; /* Replaced seamlessly by floating fluid glass navbar */
}

/* Reduced Motion Preference */
@media (prefers-reduced-motion: reduce) {
  .sainin-active-pill,
  .sainin-nav-item,
  .sainin-navbar,
  .sainin-nav-cta,
  .sainin-nav-mobile-drawer {
    transition: none !important;
  }
}