/* ========================================
   Component Styles
   Indonesian Integrated Coking Industry Base
   ======================================== */

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.75rem 1.5rem;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  vertical-align: middle;
  cursor: pointer;
  user-select: none;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Button variants */
.btn-primary {
  color: var(--color-white);
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background-color: var(--color-primary-light);
  border-color: var(--color-primary-light);
  color: var(--color-white);
}

.btn-secondary {
  color: var(--color-white);
  background-color: var(--color-secondary);
  border-color: var(--color-secondary);
}

.btn-secondary:hover {
  background-color: var(--color-secondary-dark);
  border-color: var(--color-secondary-dark);
  color: var(--color-white);
}

.btn-outline-primary {
  color: var(--color-primary);
  background-color: transparent;
  border-color: var(--color-primary);
}

.btn-outline-primary:hover {
  color: var(--color-white);
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline-secondary {
  color: var(--color-secondary);
  background-color: transparent;
  border-color: var(--color-secondary);
}

.btn-outline-secondary:hover {
  color: var(--color-white);
  background-color: var(--color-secondary);
  border-color: var(--color-secondary);
}

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

.btn-white:hover {
  color: var(--color-primary);
  background-color: var(--color-off-white);
  border-color: var(--color-off-white);
}

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

.btn-outline-white:hover {
  color: var(--color-primary);
  background-color: var(--color-white);
  border-color: var(--color-white);
}

/* Button sizes */
.btn-sm {
  padding: 0.5rem 1rem;
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: var(--font-size-md);
}

.btn-xl {
  padding: 1.25rem 2.5rem;
  font-size: var(--font-size-lg);
}

/* Button block */
.btn-block {
  display: flex;
  width: 100%;
}

/* Icon button */
.btn-icon {
  width: 48px;
  height: 48px;
  padding: 0;
  border-radius: var(--radius-full);
}

.btn-icon.btn-sm {
  width: 36px;
  height: 36px;
}

.btn-icon.btn-lg {
  width: 56px;
  height: 56px;
}

/* ========================================
   Cards
   ======================================== */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background-color: var(--color-white);
  border: 1px solid var(--color-steel-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
}

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

.card-img-top {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.card-body {
  flex: 1 1 auto;
  padding: var(--spacing-lg);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
  color: var(--color-steel-800);
}

.card-text {
  color: var(--color-steel-600);
  margin-bottom: var(--spacing-md);
}

.card-footer {
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--color-steel-100);
  border-top: 1px solid var(--color-steel-200);
}

/* Card horizontal */
.card-horizontal {
  flex-direction: row;
}

.card-horizontal .card-img-top {
  width: 40%;
  height: auto;
}

/* ========================================
   Navigation - Dark Blue Industrial Theme
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
  box-shadow: 0 2px 12px rgba(0,0,0,0.15);
  transition: all var(--transition-normal);
  height: 80px;
}

.navbar.scrolled {
  height: 72px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

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

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-white);
}

.navbar-brand img {
  height: auto;
  max-height: 62px;
  width: auto;
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-link {
  position: relative;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  transition: color var(--transition-fast), background var(--transition-fast);
  border-radius: 6px;
  letter-spacing: 0.02em;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.1);
  text-decoration: none;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background-color: var(--color-secondary);
  transition: width var(--transition-normal);
  border-radius: 1px;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 60%;
}

/* Dropdown on dark background */
.dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(6px);
  z-index: var(--z-dropdown);
  min-width: 120px;
  padding: 4px 0;
  background-color: var(--color-primary);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 6px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.25);
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
}

.dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(4px);
}

.dropdown-item {
  display: block;
  padding: 6px 14px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.8);
  transition: all 0.15s;
  white-space: nowrap;
}

.dropdown-item:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  text-decoration: none;
}

/* Mobile menu toggle */
.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--spacing-sm);
  background: none;
  border: none;
  cursor: pointer;
}

.navbar-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: rgba(255, 255, 255, 0.8);
  transition: all var(--transition-normal);
}

@media (max-width: 991.98px) {
  .navbar-toggle {
    display: flex;
  }
  
  .navbar-nav {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
    padding: var(--spacing-xl);
    overflow-y: auto;
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
  }
  
  .navbar-nav.active {
    transform: translateX(0);
  }
  
  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    padding-left: var(--spacing-md);
    background: transparent;
  }
  
  .dropdown-item {
    color: rgba(255, 255, 255, 0.7);
  }
  
  .nav-link {
    font-size: 15px;
    padding: 10px 0;
  }
}

/* Language Switcher */
.lang-switcher { position: relative; }

.lang-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lang-btn:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
}

.lang-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  min-width: 130px;
  padding: 6px 0;
  background-color: var(--color-primary);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
  z-index: var(--z-dropdown);
  display: none;
  margin-top: 4px;
}

.lang-dropdown.active { display: block; }

.lang-option {
  display: block;
  padding: 8px 16px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.8);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}

.lang-option:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
}

.lang-option.active {
  background: rgba(255, 255, 255, 0.12);
  color: var(--color-white);
  font-weight: 600;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  overflow: hidden;
  margin-top: var(--header-height);
}

.hero-carousel {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.hero-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1s ease;
}

.hero-slide.active {
  opacity: 1;
}

.hero-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to right, rgba(26, 58, 95, 0.85), rgba(26, 58, 95, 0.4));
}

.hero-content {
  position: relative;
  z-index: 1;
  color: var(--color-white);
  max-width: 700px;
}

.hero-title {
  font-size: var(--font-size-hero);
  font-weight: var(--font-weight-extrabold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-lg);
  color: var(--color-white);
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-2xl);
  color: rgba(255, 255, 255, 0.9);
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

/* Hero indicators */
.hero-indicators {
  position: absolute;
  bottom: var(--spacing-2xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: var(--spacing-sm);
  z-index: 2;
}

.hero-indicator {
  width: 12px;
  height: 12px;
  border-radius: var(--radius-full);
  background-color: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
}

.hero-indicator.active {
  background-color: var(--color-white);
  width: 36px;
  border-radius: 6px;
}

/* ========================================
   Section Headers
   ======================================== */
.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-tag {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  background-color: rgba(26, 58, 95, 0.1);
  border-radius: var(--radius-full);
  margin-bottom: var(--spacing-md);
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-steel-800);
  margin-bottom: var(--spacing-md);
}

.section-description {
  font-size: var(--font-size-lg);
  color: var(--color-steel-600);
  max-width: 700px;
  margin: 0 auto;
}

/* ========================================
   Forms
   ======================================== */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-steel-700);
}

.form-control {
  display: block;
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: var(--font-size-base);
  line-height: 1.5;
  color: var(--color-steel-700);
  background-color: var(--color-white);
  border: 1px solid var(--color-steel-300);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26, 58, 95, 0.1);
}

.form-control::placeholder {
  color: var(--color-steel-400);
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background-color: var(--color-steel-800);
  color: var(--color-steel-300);
  padding-top: var(--spacing-4xl);
}

.footer-top {
  padding-bottom: var(--spacing-3xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom {
  padding: var(--spacing-lg) 0;
  text-align: center;
  font-size: var(--font-size-sm);
}

.footer-logo {
  height: 50px;
  width: auto;
  margin-bottom: var(--spacing-md);
}

.footer-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-white);
  margin-bottom: var(--spacing-lg);
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  color: var(--color-steel-400);
  transition: color var(--transition-fast);
}

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

.footer-contact-item {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.footer-contact-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--color-secondary);
}

/* ========================================
   Back to Top
   ======================================== */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  width: 48px;
  height: 48px;
  background-color: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-normal);
  z-index: var(--z-fixed);
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background-color: var(--color-primary-light);
  transform: translateY(-4px);
}