/* ============================================
   USHA MITTAL – INDUSTRIAL GRID + SILENT AUTHORITY
   Design System
   ============================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;500;600;700;800;900&family=Inter:wght@300;400;500;600;700&display=swap');

/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */
:root {
  /* Color Palette */
  --charcoal: #1a1a1a;
  --charcoal-deep: #111111;
  --charcoal-light: #2a2a2a;
  --steel-grey: #4a4a4a;
  --steel-grey-light: #6a6a6a;
  --metallic-silver: #a8a8a8;
  --silver-light: #c8c8c8;
  --deep-bronze: #8B6914;
  --bronze-light: #a8842a;
  --bronze-dark: #6d5210;
  --white: #f0f0f0;
  --white-pure: #ffffff;
  --off-white: #e0e0e0;
  --text-primary: #f0f0f0;
  --text-secondary: #a8a8a8;
  --text-muted: #6a6a6a;
  --border-color: rgba(168, 168, 168, 0.15);
  --border-bronze: rgba(139, 105, 20, 0.3);

  /* Typography */
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', -apple-system, sans-serif;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 8rem;

  /* Layout */
  --max-width: 1280px;
  --nav-height: 80px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ============================================
   Reset & Base Styles
   ============================================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background-color: var(--charcoal);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(2rem, 3.5vw, 3rem);
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(1.4rem, 2.5vw, 1.8rem);
}

h4 {
  font-size: clamp(1.1rem, 1.5vw, 1.3rem);
}

p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 70ch;
}

.text-bronze {
  color: var(--deep-bronze);
}

.text-silver {
  color: var(--metallic-silver);
}

.label {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--deep-bronze);
}

/* ============================================
   Layout Utilities
   ============================================ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-3xl) 0;
  position: relative;
}

.section--compact {
  padding: var(--space-xl) 0;
}

/* ============================================
   Industrial Grid System
   ============================================ */
.grid {
  display: grid;
  gap: var(--space-md);
}

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

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

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

.grid--asymmetric {
  grid-template-columns: 1.5fr 1fr;
}

.grid--asymmetric-reverse {
  grid-template-columns: 1fr 1.5fr;
}

.grid--hero {
  grid-template-columns: 1fr 1fr;
  min-height: 80vh;
  align-items: center;
}

/* ============================================
   Panel Components (Industrial Grid Blocks)
   ============================================ */
.panel {
  background: var(--charcoal-light);
  border: 1px solid var(--border-color);
  padding: var(--space-lg);
  position: relative;
  transition: border-color var(--transition-base);
}

.panel:hover {
  border-color: rgba(139, 105, 20, 0.25);
}

.panel--dark {
  background: var(--charcoal-deep);
}

.panel--bordered {
  border-left: 3px solid var(--deep-bronze);
}

.panel--featured {
  background: linear-gradient(135deg, var(--charcoal-light) 0%, rgba(139, 105, 20, 0.08) 100%);
  border: 1px solid var(--border-bronze);
}

.panel--image {
  padding: 0;
  overflow: hidden;
}

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

.panel--image:hover img {
  transform: scale(1.03);
}

.panel__number {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 800;
  color: rgba(139, 105, 20, 0.2);
  line-height: 1;
  margin-bottom: var(--space-sm);
}

.panel__title {
  font-size: 1.2rem;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.panel__text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================
   Navigation (TOP ONLY – NO SIDEBAR)
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(17, 17, 17, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-base);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.nav__brand {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.nav__brand span {
  color: var(--deep-bronze);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav__link {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--metallic-silver);
  padding: var(--space-xs) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--deep-bronze);
  transition: width var(--transition-base);
}

.nav__link:hover,
.nav__link--active {
  color: var(--white);
}

.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
}

/* Mobile menu toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 5px;
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--metallic-silver);
  transition: all var(--transition-base);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: var(--nav-height);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.15;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(17, 17, 17, 0.95) 0%,
    rgba(26, 26, 26, 0.85) 50%,
    rgba(17, 17, 17, 0.9) 100%
  );
  z-index: 1;
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 800px;
}

.hero__label {
  display: inline-block;
  margin-bottom: var(--space-md);
}

.hero__title {
  margin-bottom: var(--space-md);
}

.hero__subtitle {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: var(--metallic-silver);
  margin-bottom: var(--space-lg);
  max-width: 600px;
  font-weight: 300;
}

.hero__line {
  width: 80px;
  height: 2px;
  background: var(--deep-bronze);
  margin-bottom: var(--space-lg);
}

/* ============================================
   Page Header
   ============================================ */
.page-header {
  padding: calc(var(--nav-height) + var(--space-3xl)) 0 var(--space-xl);
  position: relative;
  border-bottom: 1px solid var(--border-color);
}

.page-header__label {
  margin-bottom: var(--space-sm);
}

.page-header__title {
  margin-bottom: var(--space-md);
}

.page-header__desc {
  font-size: 1.1rem;
  max-width: 600px;
}

.page-header__line {
  width: 60px;
  height: 2px;
  background: var(--deep-bronze);
  margin-top: var(--space-md);
}

/* ============================================
   Stat Blocks
   ============================================ */
.stat {
  text-align: center;
  padding: var(--space-lg);
}

.stat__number {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 800;
  color: var(--deep-bronze);
  line-height: 1;
  margin-bottom: var(--space-xs);
}

.stat__label {
  font-size: 0.85rem;
  color: var(--metallic-silver);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 14px 32px;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
}

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

.btn--primary:hover {
  background: var(--bronze-light);
}

.btn--outline {
  background: transparent;
  color: var(--metallic-silver);
  border: 1px solid var(--border-color);
}

.btn--outline:hover {
  border-color: var(--deep-bronze);
  color: var(--white);
}

.btn--arrow::after {
  content: '→';
  transition: transform var(--transition-fast);
}

.btn--arrow:hover::after {
  transform: translateX(4px);
}

/* ============================================
   Divider
   ============================================ */
.divider {
  width: 100%;
  height: 1px;
  background: var(--border-color);
}

.divider--bronze {
  background: linear-gradient(90deg, var(--deep-bronze), transparent);
  height: 2px;
}

/* ============================================
   Image with overlay
   ============================================ */
.image-block {
  position: relative;
  overflow: hidden;
}

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

.image-block:hover img {
  transform: scale(1.03);
}

.image-block__overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-md);
  background: linear-gradient(transparent, rgba(17, 17, 17, 0.9));
}

/* ============================================
   Gallery Grid
   ============================================ */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
}

.gallery-item {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4/3;
  cursor: pointer;
}

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

.gallery-item:hover img {
  transform: scale(1.05);
}

.gallery-item__caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-sm) var(--space-md);
  background: linear-gradient(transparent, rgba(17, 17, 17, 0.9));
  transform: translateY(100%);
  transition: transform var(--transition-base);
}

.gallery-item:hover .gallery-item__caption {
  transform: translateY(0);
}

.gallery-item__caption p {
  font-size: 0.85rem;
  color: var(--white);
}

/* ============================================
   Contact Form
   ============================================ */
.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--metallic-silver);
  margin-bottom: var(--space-xs);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 14px 18px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  background: var(--charcoal-deep);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  transition: border-color var(--transition-fast);
  outline: none;
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--deep-bronze);
}

.form-textarea {
  min-height: 150px;
  resize: vertical;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--charcoal-deep);
  border-top: 1px solid var(--border-color);
  padding: var(--space-xl) 0 var(--space-lg);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.footer__brand {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.footer__desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  max-width: 350px;
}

.footer__title {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--deep-bronze);
  margin-bottom: var(--space-md);
}

.footer__link {
  display: block;
  font-size: 0.9rem;
  color: var(--metallic-silver);
  margin-bottom: var(--space-xs);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--white);
}

.footer__bottom {
  border-top: 1px solid var(--border-color);
  padding-top: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.footer__credit {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer__credit a {
  color: var(--deep-bronze);
  transition: color var(--transition-fast);
}

.footer__credit a:hover {
  color: var(--bronze-light);
}

.footer__social {
  display: flex;
  gap: var(--space-sm);
}

.footer__social-link {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
  color: var(--metallic-silver);
  font-size: 0.85rem;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.footer__social-link svg {
  width: 16px;
  height: 16px;
  display: block;
  fill: currentColor;
}

.footer__social-link:hover {
  border-color: var(--deep-bronze);
  color: var(--deep-bronze);
}

/* ============================================
   Password Page
   ============================================ */
.password-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--charcoal-deep);
  position: relative;
  overflow: hidden;
}

.password-page__texture {
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(168, 168, 168, 0.02) 2px,
      rgba(168, 168, 168, 0.02) 4px
    ),
    radial-gradient(
      ellipse at center,
      rgba(139, 105, 20, 0.05) 0%,
      transparent 70%
    );
  z-index: 0;
}

.password-box {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--space-xl);
  max-width: 450px;
  width: 100%;
}

.password-box__title {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
  letter-spacing: 0.05em;
}

.password-box__subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: var(--space-xl);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.password-box__input-wrap {
  position: relative;
  margin-bottom: var(--space-md);
}

.password-box__input {
  width: 100%;
  padding: 16px 20px;
  font-family: var(--font-body);
  font-size: 1rem;
  background: rgba(42, 42, 42, 0.6);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  text-align: center;
  letter-spacing: 0.2em;
  outline: none;
  transition: border-color var(--transition-base);
}

.password-box__input:focus {
  border-color: var(--deep-bronze);
}

.password-box__input::placeholder {
  color: var(--text-muted);
  letter-spacing: 0.1em;
}

.password-box__btn {
  width: 100%;
  padding: 16px;
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  background: var(--deep-bronze);
  color: var(--white);
  border: none;
  cursor: pointer;
  transition: background var(--transition-base);
}

.password-box__btn:hover {
  background: var(--bronze-light);
}

.password-box__error {
  margin-top: var(--space-sm);
  font-size: 0.85rem;
  color: #c0392b;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.password-box__error.visible {
  opacity: 1;
}

.password-box__line {
  width: 40px;
  height: 2px;
  background: var(--deep-bronze);
  margin: 0 auto var(--space-lg);
}

/* Transition overlay for password success */
.transition-overlay {
  position: fixed;
  inset: 0;
  background: var(--charcoal-deep);
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.6s ease;
}

.transition-overlay.active {
  opacity: 1;
  pointer-events: all;
}

/* ============================================
   Timeline
   ============================================ */
.timeline {
  position: relative;
  padding-left: var(--space-xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--border-color);
}

.timeline__item {
  position: relative;
  padding-bottom: var(--space-xl);
}

.timeline__item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-xl));
  top: 8px;
  width: 8px;
  height: 8px;
  background: var(--deep-bronze);
  border-radius: 0;
}

.timeline__year {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--deep-bronze);
  margin-bottom: var(--space-xs);
}

.timeline__title {
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.timeline__desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ============================================
   Map / Global Presence
   ============================================ */
.presence-card {
  padding: var(--space-lg);
  background: var(--charcoal-light);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--deep-bronze);
  transition: all var(--transition-base);
}

.presence-card:hover {
  border-color: var(--deep-bronze);
  background: rgba(139, 105, 20, 0.05);
}

.presence-card__region {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--deep-bronze);
  margin-bottom: var(--space-xs);
}

.presence-card__title {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  margin-bottom: var(--space-sm);
}

.presence-card__text {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ============================================
   Animations (Controlled & Precise)
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1024px) {
  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 70px;
  }

  .nav__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(17, 17, 17, 0.98);
    flex-direction: column;
    justify-content: center;
    gap: var(--space-lg);
    transform: translateX(100%);
    transition: transform var(--transition-base);
  }

  .nav__links.open {
    transform: translateX(0);
  }

  .nav__toggle {
    display: flex;
  }

  .nav__link {
    font-size: 1rem;
  }

  .grid--2,
  .grid--3,
  .grid--4,
  .grid--asymmetric,
  .grid--asymmetric-reverse,
  .grid--hero {
    grid-template-columns: 1fr;
  }

  .gallery-grid {
    grid-template-columns: 1fr;
  }

  .footer__grid {
    grid-template-columns: 1fr;
  }

  .footer__bottom {
    flex-direction: column;
    text-align: center;
  }

  .section {
    padding: var(--space-xl) 0;
  }

  .container {
    padding: 0 var(--space-md);
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 2rem;
  }

  .hero {
    min-height: 90vh;
  }
}