/* ==========================================================================
   VYE CORPORATE WEBSITE — MASTER DESIGN SYSTEM CSS
   Specification: Design.md (v1.0)
   Brand: VYE Manufacturer and Consultants Pvt. Ltd.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. DESIGN TOKENS & CSS CUSTOM PROPERTIES
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette */
  --color-navy-950: #101D2B;
  --color-navy-900: #17283A;
  --color-navy-800: #23384D;
  --color-slate-700: #3F5468;
  --color-maroon-700: #7A2F35;
  --color-maroon-600: #8C3B40;
  --color-bronze-500: #A8864A;
  --color-bronze-300: #C9B27A;
  --color-stone-100: #F4F1EC;
  --color-stone-50: #FAF8F4;
  --color-white: #FFFFFF;
  --color-charcoal: #17191C;
  --color-grey-700: #4F555C;
  --color-grey-500: #7A8087;
  --color-grey-300: #C6C9CD;
  --color-grey-200: #DDDFE2;
  --color-grey-100: #ECEDEF;

  /* Functional Status Colors */
  --color-success: #2F6A4F;
  --color-warning: #9A6A1A;
  --color-error: #A73B3B;
  --color-info: #356B8A;

  /* Typography Families */
  --font-display: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Source Serif 4', Georgia, serif;

  /* Typography Scale */
  --text-display-xl: clamp(3.2rem, 5.5vw, 5.5rem);
  --text-display-lg: clamp(2.5rem, 4.2vw, 4.2rem);
  --text-h1: clamp(2.1rem, 3.2vw, 3.2rem);
  --text-h2: clamp(1.75rem, 2.5vw, 2.4rem);
  --text-h3: clamp(1.4rem, 1.8vw, 1.8rem);
  --text-h4: 1.25rem;
  --text-body-lg: 1.125rem;
  --text-body: 1rem;
  --text-small: 0.875rem;
  --text-caption: 0.75rem;

  /* Spacing System (8px Grid) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;
  --space-10: 128px;

  /* Layout Boundaries */
  --max-width-xl: 1440px;
  --max-width-lg: 1240px;
  --max-width-md: 960px;
  --max-width-sm: 680px;

  /* Border Radii */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Elevation Shadows & Transitions */
  --shadow-subtle: 0 4px 20px rgba(16, 29, 43, 0.05);
  --shadow-card: 0 8px 30px rgba(16, 29, 43, 0.08);
  --shadow-elevated: 0 16px 40px rgba(16, 29, 43, 0.12);
  --transition-fast: 150ms cubic-bezier(0.2, 0.8, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.2, 0.8, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* --------------------------------------------------------------------------
   2. GLOBAL RESET & BASE STYLES
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.6;
  color: var(--color-navy-950);
  background-color: var(--color-stone-50);
  overflow-x: hidden;
}

/* Accessibility Focus States */
:focus-visible {
  outline: 3px solid var(--color-maroon-600);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--color-maroon-700);
  color: var(--color-white);
  padding: 12px 24px;
  z-index: 10000;
  text-decoration: none;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 20px;
}

/* Typography Defaults */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  color: var(--color-navy-950);
  letter-spacing: -0.01em;
}

h1 { font-size: var(--text-h1); margin-bottom: var(--space-4); }
h2 { font-size: var(--text-h2); margin-bottom: var(--space-4); }
h3 { font-size: var(--text-h3); margin-bottom: var(--space-3); }
h4 { font-size: var(--text-h4); margin-bottom: var(--space-2); }

p {
  margin-bottom: var(--space-4);
  color: var(--color-grey-700);
}

p.lead {
  font-size: var(--text-body-lg);
  line-height: 1.7;
  color: var(--color-navy-800);
}

a {
  color: var(--color-maroon-700);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-maroon-600);
}

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

/* --------------------------------------------------------------------------
   3. LAYOUT CONTAINERS & GRID SYSTEM
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width-xl);
  margin-left: auto;
  margin-right: auto;
  padding-left: clamp(20px, 4vw, 64px);
  padding-right: clamp(20px, 4vw, 64px);
}

.section {
  padding-top: clamp(64px, 8vw, 128px);
  padding-bottom: clamp(64px, 8vw, 128px);
  position: relative;
}

.section-compact {
  padding-top: clamp(40px, 5vw, 72px);
  padding-bottom: clamp(40px, 5vw, 72px);
}

.section-dark {
  background-color: var(--color-navy-950);
  color: var(--color-stone-100);
}

.section-dark h1, .section-dark h2, .section-dark h3, .section-dark h4 {
  color: var(--color-white);
}

.section-dark p {
  color: var(--color-grey-300);
}

.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-12 {
  grid-template-columns: repeat(12, 1fr);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
  .grid-4, .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid-12, .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
}

/* --------------------------------------------------------------------------
   4. NAVIGATION & HEADER
   -------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 88px;
  z-index: 1000;
  transition: all var(--transition-normal);
  background: rgba(16, 29, 43, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.site-header.scrolled {
  height: 72px;
  background: rgba(16, 29, 43, 0.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(168, 134, 74, 0.25);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.brand-logo img {
  height: 42px;
  width: auto;
}

.brand-logo-text {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: 0.02em;
  color: var(--color-white);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  list-style: none;
}

.nav-link {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  padding: 8px 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-bronze-300);
}

.nav-link.active {
  color: var(--color-bronze-300);
  font-weight: 700;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-bronze-300);
  border-radius: var(--radius-full);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Mobile Navigation Toggle */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-white);
}

@media (max-width: 1140px) {
  .nav-menu { display: none; }
  .mobile-nav-toggle { display: block; }
}

/* Mobile Nav Drawer Overlay */
.mobile-nav-drawer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: var(--color-navy-950);
  z-index: 2000;
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  overflow-y: auto;
}

.mobile-nav-drawer.active {
  transform: translateX(0);
}

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mobile-nav-links {
  list-style: none;
  margin-top: 40px;
}

.mobile-nav-links li {
  margin-bottom: 20px;
}

.mobile-nav-links a {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--color-white);
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   5. BUTTONS & UI CONTROLS
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-maroon-700);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: var(--color-maroon-600);
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(122, 47, 53, 0.3);
}

.btn-secondary {
  background-color: transparent;
  border-color: var(--color-navy-800);
  color: var(--color-navy-950);
}

.btn-secondary:hover {
  background-color: var(--color-stone-100);
  border-color: var(--color-navy-950);
}

.btn-dark {
  background-color: var(--color-navy-900);
  color: var(--color-white);
}

.btn-dark:hover {
  background-color: var(--color-navy-800);
  color: var(--color-white);
}

.btn-bronze {
  background-color: var(--color-bronze-500);
  color: var(--color-white);
}

.btn-bronze:hover {
  background-color: #96763e;
}

.btn-outline-white {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.3);
  color: var(--color-white);
}

.btn-outline-white:hover {
  border-color: var(--color-white);
  background: rgba(255, 255, 255, 0.1);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

/* --------------------------------------------------------------------------
   6. CARDS & CONTENT MODULES
   -------------------------------------------------------------------------- */
.card {
  background: var(--color-white);
  border: 1px solid var(--color-grey-200);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-normal);
}

.card:hover {
  border-color: var(--color-grey-300);
  box-shadow: var(--shadow-card);
  transform: translateY(-2px);
}

/* Project Editorial Card */
.project-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--color-white);
  border: 1px solid var(--color-grey-200);
  transition: all var(--transition-normal);
}

.project-card-image {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--color-navy-950);
}

.project-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-card:hover .project-card-image img,
.project-card a:hover .project-card-image img {
  transform: scale(1.03);
}

.project-card h3 a {
  color: var(--color-navy-950);
  text-decoration: none;
  transition: color var(--transition-normal);
}

.project-card h3 a:hover {
  color: var(--color-maroon-700);
}

.project-card-body {
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: var(--text-small);
  color: var(--color-grey-500);
  margin-bottom: var(--space-2);
}

.role-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-sm);
  background: var(--color-stone-100);
  color: var(--color-maroon-700);
  border: 1px solid rgba(122, 47, 53, 0.15);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
}

.status-open { background: rgba(47, 106, 79, 0.12); color: var(--color-success); }
.status-closed { background: rgba(167, 59, 59, 0.12); color: var(--color-error); }
.status-updated { background: rgba(154, 106, 26, 0.12); color: var(--color-warning); }

/* --------------------------------------------------------------------------
   7. CREDIBILITY STRIP & METRICS
   -------------------------------------------------------------------------- */
.metrics-strip {
  background: var(--color-navy-950);
  color: var(--color-white);
  padding: var(--space-7) 0;
  border-top: 1px solid var(--color-navy-800);
  border-bottom: 1px solid var(--color-navy-800);
}

.metric-item {
  text-align: center;
  padding: 0 var(--space-4);
}

.metric-number {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.5vw, 3.5rem);
  font-weight: 700;
  color: var(--color-bronze-300);
  line-height: 1;
  margin-bottom: var(--space-2);
}

.metric-label {
  font-size: var(--text-small);
  color: var(--color-grey-300);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* --------------------------------------------------------------------------
   8. PROCESS TIMELINE & DIAGRAMS
   -------------------------------------------------------------------------- */
.process-timeline {
  display: flex;
  overflow-x: auto;
  gap: var(--space-4);
  padding-bottom: var(--space-4);
  scrollbar-width: thin;
}

.process-step {
  min-width: 220px;
  background: var(--color-white);
  padding: var(--space-5);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-maroon-700);
  border: 1px solid var(--color-grey-200);
  border-left-width: 4px;
}

.process-number {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-bronze-500);
  font-size: 1.1rem;
  margin-bottom: var(--space-1);
}

/* --------------------------------------------------------------------------
   9. FOOTER
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--color-navy-950);
  color: var(--color-stone-100);
  padding-top: var(--space-9);
  padding-bottom: var(--space-6);
  border-top: 1px solid var(--color-navy-800);
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr repeat(4, 1fr);
  gap: var(--space-7);
  margin-bottom: var(--space-8);
}

@media (max-width: 960px) {
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .footer-top {
    grid-template-columns: 1fr;
  }
}

.footer-brand p {
  color: var(--color-grey-300);
  margin-top: var(--space-3);
  font-size: var(--text-small);
}

.footer-col h4 {
  color: var(--color-white);
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-4);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--space-2);
}

.footer-links a {
  color: var(--color-grey-300);
  font-size: 0.9rem;
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--color-bronze-300);
}

.footer-bottom {
  border-top: 1px solid var(--color-navy-800);
  padding-top: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-small);
  color: var(--color-grey-500);
}

@media (max-width: 640px) {
  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}

/* --------------------------------------------------------------------------
   10. REDUCED MOTION PREFERENCES
   -------------------------------------------------------------------------- */
@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;
  }
}

/* --------------------------------------------------------------------------
   11. PROJECT PORTFOLIO GRID UNIFORMITY
   -------------------------------------------------------------------------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 32px;
  align-items: stretch;
}

.project-card-wrapper {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.project-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: var(--color-white);
  border: 1px solid var(--color-grey-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-subtle);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-color: var(--color-bronze-300);
}

/* --------------------------------------------------------------------------
   12. IP PRODUCT CARD THUMBNAILS
   -------------------------------------------------------------------------- */
.ip-product-card {
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.ip-product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.ip-card-thumb {
  width: 100%;
  height: 220px;
  overflow: hidden;
  background: var(--color-navy-950);
  position: relative;
}

.ip-card-thumb img {
  width: 100%;
  height: 100%;
  /* object-fit is set per-card via inline style — cover for photos, contain for diagrams */
  display: block;
  transition: transform 350ms ease;
}

/* Zoom on hover only for cover images (photo cards) */
.ip-product-card:hover .ip-card-thumb img[style*="cover"] {
  transform: scale(1.04);
}

/* No zoom for contain/diagram images */
.ip-product-card:hover .ip-card-thumb img[style*="contain"] {
  transform: none;
}

.ip-card-thumb--gradient {
  background: linear-gradient(135deg, var(--color-navy-950) 0%, hsl(220, 35%, 22%) 60%, var(--color-maroon-700) 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
}

.ip-product-card h3 a:hover {
  color: var(--color-maroon-700);
}