/* ============================================
   ZHICAI Components — components.css
   Reusable UI Components
   ============================================ */

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-8);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255,255,255,0.15) 50%, transparent 70%);
  transform: translateX(-100%);
  transition: transform 0.5s ease;
}

.btn:hover::after {
  transform: translateX(100%);
}

.btn-primary {
  background-color: var(--color-cta);
  color: var(--color-white);
  box-shadow: 0 4px 15px rgba(45, 106, 79, 0.3);
}

.btn-primary:hover {
  background-color: var(--color-cta-hover);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(45, 106, 79, 0.4);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-coffee);
  border: 2px solid var(--color-kraft);
}

.btn-secondary:hover {
  background-color: var(--color-kraft);
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn-white {
  background-color: var(--color-white);
  color: var(--color-forest);
  box-shadow: var(--shadow-md);
}

.btn-white:hover {
  background-color: var(--color-warm-white);
  color: var(--color-forest-dark);
  transform: translateY(-2px);
}

.btn-sm {
  padding: var(--space-2) var(--space-5);
  font-size: var(--text-sm);
}

.btn-lg {
  padding: var(--space-4) var(--space-10);
  font-size: var(--text-lg);
}

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  z-index: var(--z-fixed);
  transition: all var(--transition-base);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(250, 246, 241, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
}

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

.nav-logo {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-coffee);
  letter-spacing: 2px;
  text-transform: uppercase;
}

.navbar:not(.scrolled) .nav-logo {
  color: var(--color-white);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  position: relative;
  padding: var(--space-2) 0;
  letter-spacing: 0.5px;
}

.navbar:not(.scrolled) .nav-link {
  color: rgba(255, 255, 255, 0.9);
}

.navbar:not(.scrolled) .nav-link:hover {
  color: var(--color-white);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-forest);
  transition: width var(--transition-base);
}

.navbar:not(.scrolled) .nav-link::after {
  background-color: var(--color-white);
}

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

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* Language Switcher */
.lang-switch {
  display: flex;
  align-items: center;
  background: rgba(166, 124, 82, 0.1);
  border-radius: var(--radius-full);
  padding: 2px;
  font-size: var(--text-sm);
  font-weight: 600;
}

.navbar:not(.scrolled) .lang-switch {
  background: rgba(255, 255, 255, 0.15);
}

.lang-switch button {
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  color: var(--color-text-light);
  font-weight: 600;
  font-size: var(--text-sm);
}

.navbar:not(.scrolled) .lang-switch button {
  color: rgba(255, 255, 255, 0.7);
}

.lang-switch button.active {
  background-color: var(--color-kraft);
  color: var(--color-white);
}

.navbar:not(.scrolled) .lang-switch button.active {
  background-color: rgba(255, 255, 255, 0.9);
  color: var(--color-coffee);
}

.nav-cta {
  font-size: var(--text-sm);
  padding: var(--space-2) var(--space-6);
}

.navbar:not(.scrolled) .nav-cta {
  background-color: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: var(--color-white);
}

.navbar:not(.scrolled) .nav-cta:hover {
  background-color: var(--color-white);
  color: var(--color-forest);
}

/* Mobile Menu Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  cursor: pointer;
  z-index: var(--z-overlay);
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--color-coffee);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.navbar:not(.scrolled) .nav-toggle span {
  background-color: var(--color-white);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Overlay */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(26, 26, 26, 0.5);
  backdrop-filter: blur(4px);
  z-index: var(--z-overlay);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.nav-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

/* Mobile Menu */
.nav-mobile {
  display: none;
  position: fixed;
  top: 0;
  right: -100%;
  width: 320px;
  max-width: 85vw;
  height: 100vh;
  background: var(--color-warm-white);
  z-index: var(--z-modal);
  padding: var(--space-24) var(--space-8);
  pointer-events: none;
  transition: right var(--transition-slow);
  box-shadow: var(--shadow-xl);
}

.nav-mobile.active {
  right: 0;
  pointer-events: auto;
}

.nav-mobile .nav-link {
  display: block;
  font-size: var(--text-xl);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
}

.nav-mobile .nav-link:hover {
  color: var(--color-forest);
}

.nav-mobile .nav-link::after {
  display: none;
}

.nav-mobile .nav-actions {
  margin-top: var(--space-8);
  flex-direction: column;
  align-items: stretch;
}

.nav-mobile .btn {
  text-align: center;
}

/* --- Cards --- */
.card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

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

.card-image {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.card:hover .card-image {
  transform: scale(1.05);
}

.card-image-wrapper {
  overflow: hidden;
  position: relative;
}

.card-body {
  padding: var(--space-6);
}

.card-tag {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-forest);
  background: rgba(45, 106, 79, 0.08);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-3);
}

.card-title {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-coffee);
  margin-bottom: var(--space-2);
  line-height: 1.4;
}

.card-text {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-meta {
  font-size: var(--text-xs);
  color: var(--color-gray-400);
  margin-top: var(--space-3);
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-forest);
  margin-top: var(--space-4);
  transition: gap var(--transition-base);
}

.card-link:hover {
  gap: var(--space-3);
  color: var(--color-forest-dark);
}

/* --- Stat Counter --- */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-8);
}

.stat-item {
  text-align: center;
  padding: var(--space-8);
}

.stat-number {
  font-family: var(--font-mono);
  font-size: var(--text-5xl);
  font-weight: 800;
  color: var(--color-kraft);
  line-height: 1;
  margin-bottom: var(--space-2);
  white-space: nowrap;
}

.stat-unit {
  font-size: var(--text-2xl);
  font-weight: 700;
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* --- Badge (Certification) --- */
.badge-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-6);
}

.badge {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-gold);
  background: rgba(201, 168, 76, 0.08);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  border: 1px solid rgba(201, 168, 76, 0.2);
  transition: all var(--transition-base);
}

.badge:hover {
  background: rgba(201, 168, 76, 0.15);
  transform: translateY(-2px);
}

.badge-icon {
  width: 20px;
  height: 20px;
}

/* --- Feature Icons Grid --- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-6);
}

.feature-item {
  text-align: center;
  padding: var(--space-6);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  background: var(--color-white);
  border: 1px solid transparent;
}

.feature-item:hover {
  border-color: var(--color-kraft-light);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-3);
  color: var(--color-forest);
}

.feature-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-coffee);
}

/* --- Tab Component --- */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
  justify-content: center;
}

.tab-btn {
  padding: var(--space-2) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-light);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-white);
  transition: all var(--transition-base);
}

.tab-btn:hover {
  border-color: var(--color-kraft);
  color: var(--color-kraft);
}

.tab-btn.active {
  background-color: var(--color-kraft);
  border-color: var(--color-kraft);
  color: var(--color-white);
}

.tab-content {
  display: none;
  animation: fadeIn 0.4s ease;
}

.tab-content.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* --- Footer --- */
.footer {
  background-color: var(--color-coffee);
  color: rgba(255, 255, 255, 0.8);
  padding-top: var(--space-16);
  padding-bottom: var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

.footer-brand .nav-logo {
  color: var(--color-warm-white);
  margin-bottom: var(--space-4);
  display: inline-block;
}

.footer-brand p {
  font-size: var(--text-sm);
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.6);
  max-width: 320px;
}

.footer-title {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-warm-white);
  margin-bottom: var(--space-6);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-link {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.6);
  transition: all var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-white);
  padding-left: var(--space-2);
}

.footer-social {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.7);
  transition: all var(--transition-base);
}

.footer-social a:hover {
  background: var(--color-kraft);
  color: var(--color-white);
  transform: translateY(-2px);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.4);
}

/* --- Page Hero --- */
.page-hero {
  position: relative;
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background:
    linear-gradient(135deg, rgba(61, 43, 31, 0.94) 0%, rgba(27, 67, 50, 0.84) 100%),
    url('../images/generated/cta-kraft-forest-texture.webp') center / cover no-repeat,
    var(--color-coffee);
  color: var(--color-white);
  overflow: hidden;
  padding-top: var(--nav-height);
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(61, 43, 31, 0.7) 0%, rgba(61, 43, 31, 0.5) 100%);
  z-index: 1;
}

.page-hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-hero .container {
  position: relative;
  z-index: 2;
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
}

.page-hero h1 {
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.page-hero p {
  color: rgba(255, 255, 255, 0.85);
  font-size: var(--text-lg);
  max-width: 60ch;
  margin: 0 auto;
}

/* --- CTA Banner --- */
.cta-banner {
  position: relative;
  padding: var(--space-20) 0;
  text-align: center;
  background:
    linear-gradient(135deg, rgba(45, 106, 79, 0.9) 0%, rgba(27, 67, 50, 0.94) 100%),
    url('../images/generated/cta-kraft-forest-texture.webp') center / cover no-repeat,
    var(--color-forest-dark);
  color: var(--color-white);
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.cta-banner h2 {
  color: var(--color-white);
  margin-bottom: var(--space-4);
  position: relative;
}

.cta-banner p {
  color: rgba(255, 255, 255, 0.85);
  font-size: var(--text-lg);
  margin-bottom: var(--space-8);
  max-width: 50ch;
  margin-left: auto;
  margin-right: auto;
  position: relative;
}

.cta-banner .btn-group {
  position: relative;
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-mobile,
  .nav-overlay {
    display: block;
  }

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

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-brand p {
    margin: 0 auto;
  }

  .footer-social {
    justify-content: center;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }

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

  .stat-item:last-child {
    grid-column: span 2;
  }

  .stat-number {
    font-size: clamp(var(--text-xl), 6vw, var(--text-2xl)) !important;
    white-space: nowrap !important;
  }

  .capabilities-row {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: var(--space-3) !important;
  }

  .capabilities-row .cap-card {
    padding: var(--space-3) var(--space-4) !important;
    gap: var(--space-2) !important;
  }

  .capabilities-row .cap-card .feature-icon {
    width: 36px !important;
    height: 36px !important;
  }

  .capabilities-row .cap-card span {
    font-size: var(--text-sm) !important;
  }

  .badge-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
  }

  .cert-badge {
    width: 100% !important;
    padding: var(--space-4) !important;
  }

  .cert-badge:last-child {
    grid-column: span 2;
  }

  .section {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
  }
}