/**
 * BiyoSoil Gold Master - Main Stylesheet
 * 2026 Design: solid surfaces, layered shadows, restrained motion.
 *
 * Design System:
 *   Surfaces: .surface, .surface-strong, .glass-enhanced, .glass-light
 *   Text: .text-muted, .text-muted-soft, .text-faint
 *   Borders: .border-soft, .border-soft-strong
 *   Spacing: .upper-xs, .upper-sm, .upper-md
 *
 * Z-Index Scale:
 *   50    - sticky header (Tailwind z-50)
 *   100   - scroll indicator
 *   9999  - mobile menu overlay
 *   10000 - mobile menu panel
 *
 * Transition tokens:
 *   --ease: cubic-bezier(0.4, 0, 0.2, 1)
 *   Micro (color, border): 150ms
 *   Standard (transform, shadow): 300ms
 */

:root {
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Base ── */

body {
  font-family: "Inter", "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-body-start);
  min-height: 100vh;
  overflow-x: hidden;
}

html {
  scroll-behavior: smooth;
}

::selection {
  background-color: var(--selection-bg);
  color: var(--selection-color);
}

/* ── Typography ── */

.upper-xs {
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

.upper-sm {
  text-transform: uppercase;
  letter-spacing: 0.22em;
}

.upper-md {
  text-transform: uppercase;
  letter-spacing: 0.28em;
}

h1, h2 {
  line-height: 1.15;
  font-weight: 300;
}

h3, h4, h5, h6 {
  line-height: 1.25;
  font-weight: 500;
}

p, li {
  max-width: 75ch;
}

.responsive-text {
  font-size: clamp(0.875rem, 2.5vw, 1rem);
}

.responsive-heading {
  font-size: clamp(1.5rem, 5vw, 2.5rem);
}

.responsive-hero {
  font-size: clamp(2rem, 8vw, 4rem);
}

/* ── Navigation ── */

.nav-link {
  transition: color 150ms var(--ease);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--text-primary);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--gold);
}

/* ── Text utilities ── */

.text-muted { color: var(--text-secondary); }
.text-muted-soft { color: var(--text-tertiary); }
.text-faint { color: var(--text-faint); }
.gold-text { color: var(--gold); }

.link-accent { transition: color 150ms var(--ease); }
.link-accent:hover,
.link-accent:focus-visible { color: var(--gold); }

/* ── Border utilities ── */

.border-soft { border: 1px solid var(--border-default); }
.border-soft-strong { border: 1px solid var(--border-strong); }
.border-l-soft { border-left: 1px solid var(--border-subtle); }
.border-t-soft { border-top: 1px solid var(--border-subtle); }

/* ── Surfaces (solid backgrounds + shadow depth) ── */

.surface {
  background-color: var(--surface-start);
  box-shadow:
    inset 0 1px 0 0 rgba(255, 255, 255, 0.05),
    var(--shadow-surface);
}

.surface-strong {
  background-color: var(--surface-strong-start);
  box-shadow:
    inset 0 1px 0 0 rgba(255, 255, 255, 0.07),
    var(--shadow-strong);
}

.bg-veil {
  background-color: var(--veil-bg);
}

.glass-light {
  background-color: var(--glass-start);
  box-shadow:
    inset 0 1px 0 0 var(--glass-highlight-soft),
    var(--shadow-light);
}

/* ── Glass enhanced (solid surface, shadow-driven depth) ── */

.glass-enhanced {
  background-color: var(--glass-start);
  border: 1px solid var(--border-default);
  box-shadow:
    inset 0 1px 0 0 rgba(255, 255, 255, 0.06),
    var(--shadow-glass);
  transition: border-color 300ms var(--ease), box-shadow 300ms var(--ease);
}

@media (hover: hover) {
  .glass-enhanced:hover {
    border-color: rgb(var(--gold-rgb) / 0.15);
    box-shadow:
      inset 0 1px 0 0 rgba(255, 255, 255, 0.08),
      var(--shadow-glass-hover);
  }
}

/* ── Hover lift (cards) ── */

.hover-lift {
  transition: transform 300ms var(--ease), box-shadow 300ms var(--ease);
}

@media (hover: hover) {
  .hover-lift:hover,
  .hover-lift:focus-visible {
    transform: translateY(-2px);
    box-shadow:
      inset 0 1px 0 0 rgba(255, 255, 255, 0.08),
      0 8px 24px rgba(0, 0, 0, 0.25),
      0 2px 8px rgb(var(--gold-rgb) / 0.06);
  }
}

/* ── Chip ── */

.chip {
  border: 1px solid var(--border-strong);
  border-radius: 9999px;
  padding: 0.5rem 1.25rem;
  background-color: var(--glass-start);
  box-shadow:
    inset 0 1px 0 0 rgba(255, 255, 255, 0.06),
    var(--shadow-chip);
  transition: border-color 300ms var(--ease), color 150ms var(--ease);
}

@media (hover: hover) {
  .chip:hover {
    border-color: rgb(var(--gold-rgb) / 0.3);
    color: var(--gold);
  }
}

/* ── Branding ── */

.brand-mark { height: 36px; width: auto; }
.partner-mark { height: 48px; width: auto; }
.brand-mark, .partner-mark { display: block; }

/* ── Primary button ── */

.btn-primary {
  position: relative;
  overflow: hidden;
  background-color: rgb(var(--gold-rgb) / 0.85);
  border: 1px solid rgb(var(--gold-rgb) / 0.5);
  box-shadow:
    0 2px 8px rgb(var(--gold-rgb) / 0.25),
    inset 0 1px 0 0 rgba(255, 255, 255, 0.12);
  transition: transform 300ms var(--ease), box-shadow 300ms var(--ease);
  color: var(--btn-text, #ffffff);
}

@media (hover: hover) {
  .btn-primary:hover {
    transform: translateY(-1px);
    box-shadow:
      0 6px 20px rgb(var(--gold-rgb) / 0.35),
      inset 0 1px 0 0 rgba(255, 255, 255, 0.18);
  }
}

.btn-primary:active {
  transform: translateY(0);
}

/* ── CTA button ── */

.cta {
  border: 1px solid var(--cta-border);
  background-color: var(--cta-bg-start);
  box-shadow:
    inset 0 1px 0 0 rgba(255, 255, 255, 0.08),
    var(--cta-shadow);
  transition: transform 300ms var(--ease), border-color 300ms var(--ease);
}

@media (hover: hover) {
  .cta:hover,
  .cta:focus-visible {
    transform: translateY(-1px);
    border-color: rgb(var(--gold-rgb) / 0.35);
  }
}

/* ── Decorative ── */

.line-soft {
  background-color: var(--line-soft-bg);
  display: inline-block;
  height: 1px;
  width: 3rem;
}

.pulse-line::after {
  content: "";
  position: absolute;
  inset: auto 0 -0.5rem 0;
  height: 1px;
  background: rgb(var(--gold-rgb) / 0.25);
  animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.12; transform: scaleX(0.6); }
  50% { opacity: 0.35; transform: scaleX(1); }
}

.divider-gold {
  height: 1px;
  background-color: rgb(var(--gold-rgb) / 0.15);
}

/* ── Mobile interaction ── */

.touch-action-manipulation {
  touch-action: manipulation;
}

.mobile-tap-highlight {
  -webkit-tap-highlight-color: rgb(var(--gold-rgb) / 0.2);
}

/* ── Scroll indicator ── */

.scroll-indicator {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--gold);
  z-index: 100;
  transition: width 0.1s linear;
}

/* ── Logo ── */

.logo-image {
  height: 36px;
  width: auto;
  object-fit: contain;
  filter: brightness(var(--logo-brightness)) var(--logo-shadow);
  transition: filter 300ms var(--ease);
}

@media (hover: hover) {
  .logo-image:hover {
    filter: brightness(var(--logo-brightness-hover)) var(--logo-shadow-hover);
  }
}

@media (max-width: 640px) {
  .logo-image { height: 28px; }
}

/* ── Hero video ── */

#heroVideo { object-fit: cover; }
#heroVideo:not([src]) { background: center / contain no-repeat; }

@media (max-width: 768px) {
  #hero { padding-left: 0 !important; padding-right: 0 !important; }
}

@media (orientation: landscape) and (max-height: 500px) {
  #hero .relative { max-height: 60vh; }
}

/* ── Scroll to top ── */

#scrollToTop {
  box-shadow: var(--scroll-btn-shadow);
  transition: transform 300ms var(--ease), opacity 300ms var(--ease);
}

@media (hover: hover) {
  #scrollToTop:hover {
    transform: scale(1.08);
  }
}

/* ── Header (only element with backdrop-filter) ── */

header.glass-enhanced {
  background-color: var(--header-bg-start);
  backdrop-filter: blur(16px) saturate(140%);
  box-shadow: var(--header-shadow);
}

/* ── Sections ── */

section {
  scroll-margin-top: 80px;
}

.content-section {
  padding-top: clamp(3rem, 8vw, 8rem);
  padding-bottom: clamp(3rem, 8vw, 8rem);
}

/* ── Links ── */

a:not(.btn-primary):not(.cta) { position: relative; }
a:not(.btn-primary):not(.cta):hover { text-decoration: none; }

/* ── Focus ── */

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

/* ── Form elements ── */

button, input, textarea {
  transition: color 150ms var(--ease), border-color 150ms var(--ease);
}

/* ── Touch targets ── */

@media (max-width: 768px) {
  nav a, button, a.btn-primary, a.cta {
    min-height: 44px;
    min-width: 44px;
  }
}

/* ── Mobile menu ── */

.mobile-menu {
  transform: translateX(-100%);
  transition: transform 300ms var(--ease);
  background-color: var(--menu-bg);
  backdrop-filter: blur(16px);
  border-right: 1px solid rgb(var(--gold-rgb) / 0.12);
  box-shadow: var(--menu-shadow);
  z-index: 10000;
}

.mobile-menu.open {
  transform: translateX(0);
}

.mobile-menu-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-menu);
  opacity: 0;
  visibility: hidden;
  transition: opacity 300ms var(--ease), visibility 300ms var(--ease);
  z-index: 9999;
}

.mobile-menu-overlay.open {
  opacity: 1;
  visibility: visible;
}

.mobile-menu-content {
  max-height: 100vh;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) transparent;
}

.mobile-menu-content::-webkit-scrollbar { width: 4px; }
.mobile-menu-content::-webkit-scrollbar-track { background: transparent; }
.mobile-menu-content::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 2px;
}

.mobile-menu-section {
  border-bottom: 1px solid var(--border-subtle);
  padding: 1rem 0;
}

.mobile-menu-section:last-child { border-bottom: none; }

/* ── Readability ── */

img { transition: opacity 300ms var(--ease); }
img:not([src]) { opacity: 0; }

/* ── Scroll reveal (scoped to .js to avoid hiding content without JS) ── */

html.js [data-animate] {
  opacity: 0;
  transform: translateY(1.25rem);
}

html.js [data-animate].revealed {
  opacity: 1;
  transform: none;
}

/* ── Reduced motion ── */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  html.js [data-animate] {
    opacity: 1;
    transform: none;
  }
}

/* ── Ultra-small phones ── */

@media (max-width: 359px) {
  .upper-md { letter-spacing: 0.15em; }
  .upper-sm { letter-spacing: 0.12em; }
  h1, h2 { word-break: break-word; }
}

/* ── Line clamp ── */

.line-clamp-1 {
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ── Large desktops ── */

@media (min-width: 1536px) {
  .mx-auto.max-w-6xl { max-width: 80rem; }
}