/**
 * FIANCO LUXURY ARCHITECTURAL SYSTEM - CORE STYLES
 * Guided by: design-taste-frontend, emil-design-eng, animate, mobile-native
 * International Creative Agency Caliber CSS
 * Cold Architectural Luxury: Pure Alabaster, Basalt, Patina Bronze & Saint-Gobain Cobalt
 */

@import url('./tokens.css');

/* ==========================================================================
   CSS RESET & CORE FOUNDATIONS (mobile-native & animate)
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--color-bg-base);
  color: var(--color-text-primary);
  /* mobile-native: eliminate grey tap overlay on iOS Safari and Android Chrome */
  -webkit-tap-highlight-color: transparent;
}

/* Accessibility: Full reduced motion compliance */
@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;
  }
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  background-color: var(--color-bg-base);
  color: var(--color-text-primary);
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
  /* mobile-native: prevent rubber-band pull-down refresh from hijacking nested gestures */
  overscroll-behavior-y: none;
}

/* Subtle architectural ambient light overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle at 50% 0%, oklch(0.93 0.01 85 / 0.5) 0%, transparent 65%);
  pointer-events: none;
  z-index: 0;
}

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

/* Accessibility: Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 2rem;
  background: var(--color-accent-bronze);
  color: #ffffff;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  font-size: var(--text-sm);
  text-decoration: none;
  z-index: var(--z-toast);
  transition: top var(--duration-fast) var(--ease-out);
  letter-spacing: var(--tracking-wide);
  border-radius: 0 0 2px 2px;
}

.skip-link:focus {
  top: 0;
  outline: 2px solid var(--color-text-primary);
}

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--color-accent-bronze);
  outline-offset: 3px;
}

/* Typography elements with italic descender clearance (design-taste-frontend) */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: var(--leading-tight);
  color: var(--color-text-primary);
  letter-spacing: var(--tracking-tight);
  overflow: visible;
}

h1 {
  font-size: var(--text-4xl);
  font-weight: 300;
  line-height: var(--leading-none);
}

h2 {
  font-size: var(--text-3xl);
  font-weight: 300;
  margin-bottom: var(--space-sm);
}

h3 {
  font-size: var(--text-2xl);
  font-weight: 400;
  margin-bottom: var(--space-xs);
}

h4 {
  font-size: var(--text-xl);
  font-weight: 400;
}

p {
  color: var(--color-text-secondary);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-sm);
}

p.lead {
  font-size: var(--text-md);
  color: var(--color-text-primary);
  font-weight: 300;
  line-height: var(--leading-snug);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--duration-fast) ease;
}

img, video {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

/* ==========================================================================
   LAYOUT CONTAINERS & ARCHITECTURAL PLINTHS
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  position: relative;
  z-index: var(--z-base);
}

.container-wide {
  width: 100%;
  max-width: var(--container-wide);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  position: relative;
  z-index: var(--z-base);
}

.container-narrow {
  width: 100%;
  max-width: var(--container-narrow);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  position: relative;
  z-index: var(--z-base);
}

.section {
  padding-block: var(--space-3xl);
  position: relative;
  z-index: var(--z-base);
}

.section-alt {
  background-color: var(--color-bg-elevated);
}

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

.section-compact {
  padding-block: var(--space-xl);
}

/* Eyebrow / Label tags (Strictly restrained: max 1 per 3 sections) */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-accent-bronze);
  margin-bottom: var(--space-xs);
}

.eyebrow::before {
  content: '';
  display: inline-block;
  width: 18px;
  height: 1.5px;
  background-color: var(--color-accent-bronze);
}

.eyebrow-sg {
  color: var(--color-sg-blue);
}

.eyebrow-sg::before {
  background-color: var(--color-sg-blue);
}

/* Luxury hairline divider */
.divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-medium), transparent);
  margin-block: var(--space-xl);
  border: none;
}

/* ==========================================================================
   NAVIGATION & HEADER (64px desktop cap, translucent crystalline blur)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: var(--z-nav);
  background: oklch(0.978 0.005 85 / 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transition: transform var(--duration-normal) var(--ease-out), background var(--duration-normal) ease, box-shadow var(--duration-normal) ease;
}

.site-header.scrolled {
  background: oklch(0.998 0.001 85 / 0.96);
  box-shadow: 0 4px 20px -2px rgba(17, 20, 26, 0.06);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: clamp(3.75rem, 3.25rem + 1vw, 4.25rem); /* Capped under 70px */
}

/* Brand Identity Lockup */
.brand-link {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
  touch-action: manipulation;
}

.brand-monogram {
  width: 36px;
  height: 36px;
  border: 1px solid var(--border-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--color-accent-bronze);
  background: var(--color-bg-surface);
  box-shadow: var(--shadow-subtle);
  transition: transform var(--duration-press) var(--ease-out), background var(--duration-fast) ease, color var(--duration-fast) ease;
  flex-shrink: 0;
}

@media (hover: hover) and (pointer: fine) {
  .brand-link:hover .brand-monogram {
    border-color: var(--color-accent-bronze);
    background: var(--color-accent-bronze);
    color: #ffffff;
    box-shadow: var(--shadow-accent);
  }
}

.brand-link:active .brand-monogram {
  transform: scale(0.95);
}

.brand-text-group {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 1.15rem + 0.4vw, 1.6rem);
  font-weight: 500;
  letter-spacing: var(--tracking-widest);
  color: var(--color-text-primary);
  line-height: 1;
}

.brand-subtext {
  font-family: var(--font-sans);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: var(--tracking-monumental);
  text-transform: uppercase;
  color: var(--color-accent-bronze);
  margin-top: 0.2rem;
}

/* Desktop Navigation Menu */
.nav-desktop {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 0.5rem + 1.5vw, 2.2rem);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 0.6rem + 1vw, 1.8rem);
}

.nav-link {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  padding-block: 0.4rem;
  position: relative;
  transition: color var(--duration-fast) ease;
  touch-action: manipulation;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 1.5px;
  background-color: var(--color-accent-bronze);
  transition: width var(--duration-fast) var(--ease-out);
}

@media (hover: hover) and (pointer: fine) {
  .nav-link:hover,
  .nav-link.active {
    color: var(--color-text-primary);
  }
  .nav-link:hover::after,
  .nav-link.active::after {
    width: 100%;
  }
}

.nav-link.active {
  color: var(--color-text-primary);
}
.nav-link.active::after {
  width: 100%;
}

.nav-link-sg {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.nav-badge-sg {
  font-size: 0.58rem;
  font-weight: 700;
  background: var(--color-sg-blue-dim);
  color: var(--color-sg-blue);
  border: 1px solid oklch(0.44 0.20 255 / 0.35);
  padding: 0.1rem 0.3rem;
  border-radius: 2px;
  letter-spacing: 0.05em;
}

/* Header CTAs */
.header-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

/* ==========================================================================
   BUTTONS & TACTILE MICRO-INTERACTIONS (emil-design-eng & animate)
   ========================================================================== */
.btn-primary,
.btn-outline,
.btn-sg,
.filter-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  padding: 0.8rem 1.6rem;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  user-select: none;
  touch-action: manipulation;
  /* Emil Kowalski press physics */
  transition: transform var(--duration-press) var(--ease-out), background var(--duration-fast) ease, border-color var(--duration-fast) ease, box-shadow var(--duration-fast) ease, color var(--duration-fast) ease;
}

/* Primary Architectural Button */
.btn-primary {
  background: var(--color-accent-bronze);
  color: #ffffff;
  border: 1px solid var(--color-accent-bronze);
  box-shadow: var(--shadow-subtle);
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255, 255, 255, 0.3), transparent 70%);
  transform: translateX(-100%);
  transition: transform var(--duration-deliberate) var(--ease-out);
}

@media (hover: hover) and (pointer: fine) {
  .btn-primary:hover {
    background: oklch(0.42 0.11 65);
    border-color: oklch(0.42 0.11 65);
    box-shadow: var(--shadow-accent);
    transform: translateY(-2px);
    color: #ffffff;
  }
  .btn-primary:hover::before {
    transform: translateX(100%);
  }
}

/* Emil Kowalski active press feedback */
.btn-primary:active {
  transform: scale(0.97) !important;
}

/* Outline Architectural Button */
.btn-outline {
  background: var(--color-bg-surface);
  color: var(--color-text-primary);
  border: 1px solid var(--border-medium);
  box-shadow: var(--shadow-subtle);
}

@media (hover: hover) and (pointer: fine) {
  .btn-outline:hover {
    border-color: var(--color-accent-bronze);
    color: var(--color-accent-bronze);
    background: oklch(0.48 0.11 65 / 0.04);
    transform: translateY(-2px);
  }
}

.btn-outline:active {
  transform: scale(0.97) !important;
}

/* Saint-Gobain Certified Blue Button */
.btn-sg {
  border-color: oklch(0.44 0.20 255 / 0.45);
  color: var(--color-sg-blue);
  background: var(--color-bg-surface);
}

@media (hover: hover) and (pointer: fine) {
  .btn-sg:hover {
    background: var(--color-sg-blue);
    border-color: var(--color-sg-blue);
    color: #ffffff;
    box-shadow: 0 4px 16px -2px rgba(0, 79, 176, 0.25);
    transform: translateY(-2px);
  }
}

.btn-sg:active {
  transform: scale(0.97) !important;
}

/* Mobile Nav Toggle */
.menu-toggle {
  display: none;
  background: var(--color-bg-surface);
  border: 1px solid var(--border-medium);
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--color-text-primary);
  user-select: none;
  touch-action: manipulation;
  transition: transform var(--duration-press) var(--ease-out), border-color var(--duration-fast) ease;
}

.menu-toggle:active {
  transform: scale(0.95);
}

@media (hover: hover) and (pointer: fine) {
  .menu-toggle:hover {
    border-color: var(--color-accent-bronze);
  }
}

.menu-icon {
  width: 20px;
  height: 15px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.menu-line {
  display: block;
  width: 100%;
  height: 1.5px;
  background: currentColor;
  transition: transform var(--duration-fast) var(--ease-out), opacity var(--duration-fast) ease;
}

.menu-open .menu-line:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.menu-open .menu-line:nth-child(2) {
  opacity: 0;
}

.menu-open .menu-line:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ==========================================================================
   MOBILE DRAWER (mobile-native: 100dvh, overscroll-behavior: contain)
   ========================================================================== */
.mobile-drawer {
  position: fixed;
  inset: 0;
  top: clamp(3.75rem, 3.25rem + 1vw, 4.25rem);
  height: calc(100dvh - clamp(3.75rem, 3.25rem + 1vw, 4.25rem));
  background: oklch(0.985 0.003 85 / 0.98);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  z-index: var(--z-dropdown);
  display: flex;
  flex-direction: column;
  padding: var(--space-lg) var(--container-pad);
  padding-bottom: calc(var(--space-lg) + env(safe-area-inset-bottom, 0px));
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: transform var(--duration-normal) var(--ease-drawer), opacity var(--duration-fast) ease, visibility var(--duration-normal);
  border-bottom: 1px solid var(--border-accent);
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}

.mobile-drawer.is-active {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-lg);
}

.mobile-nav-link {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-xs);
  border-bottom: 1px solid var(--border-subtle);
  touch-action: manipulation;
  transition: color var(--duration-fast) ease;
}

.mobile-nav-link span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.mobile-nav-link:active {
  color: var(--color-accent-bronze);
}

/* ==========================================================================
   BREADCRUMBS COMPONENT
   ========================================================================== */
.breadcrumb-nav {
  padding-block: var(--space-sm);
  border-bottom: 1px solid var(--border-subtle);
  background: var(--color-bg-elevated);
}

.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  color: var(--color-text-muted);
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb-separator {
  color: var(--color-accent-bronze);
  opacity: 0.6;
}

.breadcrumb-link {
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) ease;
}

@media (hover: hover) and (pointer: fine) {
  .breadcrumb-link:hover {
    color: var(--color-accent-bronze);
  }
}

.breadcrumb-current {
  color: var(--color-accent-bronze);
  font-weight: 600;
}

/* ==========================================================================
   ENTERPRISE FOOTER - GROUNDED ARCHITECTURAL PLINTH
   ========================================================================== */
.site-footer {
  margin-top: auto;
  background: oklch(0.14 0.015 250); /* Deep Basalt Foundation */
  color: oklch(0.96 0.005 85);       /* Pure Alabaster Reading Contrast */
  border-top: 1px solid var(--border-accent);
  position: relative;
  z-index: var(--z-base);
  padding-top: var(--space-3xl);
  padding-bottom: calc(var(--space-lg) + env(safe-area-inset-bottom, 0px));
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 10%;
  right: 10%;
  height: 1.5px;
  background: linear-gradient(90deg, transparent, var(--color-accent-bronze-light), transparent);
  opacity: 0.7;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.3fr;
  gap: clamp(2rem, 1.5rem + 2.5vw, 4.5rem);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.10);
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
}

.footer-brand-col .brand-name {
  color: #ffffff;
}

.footer-manifesto {
  font-size: var(--text-sm);
  color: oklch(0.78 0.012 85);
  line-height: var(--leading-relaxed);
  margin-block: var(--space-sm) var(--space-md);
  max-width: 42ch;
}

.footer-badges {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.footer-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.7rem;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  padding: 0.4rem 0.8rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.04);
  color: oklch(0.90 0.01 85);
}

.badge-sg {
  border-color: oklch(0.55 0.18 245 / 0.7);
  color: #70b3ff;
}

.footer-col-title {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-accent-bronze-light);
  margin-bottom: var(--space-md);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-link {
  font-size: var(--text-sm);
  color: oklch(0.78 0.012 85);
  transition: all var(--duration-fast) ease;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

@media (hover: hover) and (pointer: fine) {
  .footer-link:hover {
    color: var(--color-accent-bronze-light);
    transform: translateX(3px);
  }
}

.footer-contact-info {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  font-size: var(--text-sm);
  color: oklch(0.78 0.012 85);
}

.footer-address {
  font-style: normal;
  line-height: var(--leading-relaxed);
}

.footer-hotline {
  color: var(--color-accent-bronze-light);
  font-weight: 600;
}

.footer-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: #4ee297;
  margin-top: 0.5rem;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #4ee297;
  box-shadow: 0 0 10px #4ee297;
  animation: pulse-dot 2.5s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
  padding-top: var(--space-md);
  font-size: var(--text-xs);
  color: oklch(0.60 0.015 85);
}

.footer-legal-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-legal-links a {
  color: oklch(0.70 0.015 85);
  transition: color var(--duration-fast) ease;
}

@media (hover: hover) and (pointer: fine) {
  .footer-legal-links a:hover {
    color: var(--color-accent-bronze-light);
  }
}

/* ==========================================================================
   RESPONSIVE QUERIES
   ========================================================================== */
@media (max-width: 1024px) {
  .nav-desktop {
    display: none;
  }
  .menu-toggle {
    display: flex;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }
}

@media (max-width: 640px) {
  .footer-top {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}