:root {
  --primary: #0052FF;
  --primary-hover: #0045D8;
  --bg-color: #FFFFFF;
  --bg-secondary: #F9FAFB;
  --text-main: #0F172A;
  --text-muted: #64748B;
  --border-color: #E2E8F0;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-hover: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  --font-sans: 'Inter', sans-serif;
  --green-status: #10B981;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s, transform 0.2s;
}

ul {
  list-style: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Utilities */
.pt-0 {
  padding-top: 0 !important;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  z-index: 100;
  padding: 16px 0;
}

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

.nav-left {
  display: flex;
  align-items: center;
  gap: 48px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--primary);
}

.logo i {
  font-size: 1.5rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
}

.nav-links a:hover {
  color: var(--text-main);
}

.status-link {
  display: flex;
  align-items: center;
  gap: 6px;
}

.status-dot {
  width: 8px;
  height: 8px;
  background-color: var(--green-status);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.15);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.search-icon {
  color: var(--text-muted);
  font-size: 1.25rem;
  cursor: pointer;
  transition: color 0.2s;
}

.search-icon:hover {
  color: var(--text-main);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}

.btn-primary {
  background-color: var(--primary);
  color: white;
  box-shadow: 0 4px 12px rgba(0, 82, 255, 0.2);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(0, 82, 255, 0.3);
}

.btn-large {
  padding: 14px 28px;
  font-size: 1.0625rem;
}

.btn-block {
  width: 100%;
  padding: 14px;
  font-size: 1rem;
  border-radius: var(--radius-md);
}

/* Hero Section */
.hero {
  padding: 100px 0 80px 0;
  text-align: center;
  background: radial-gradient(circle at 50% 100%, #E0E7FF 0%, var(--bg-color) 70%);
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  color: #0F172A;
}

.hero p {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 48px auto;
  line-height: 1.6;
}

.search-bar-container {
  max-width: 680px;
  margin: 0 auto;
  position: relative;
}

.search-bar-container i {
  position: absolute;
  left: 24px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1.25rem;
}

.search-input {
  width: 100%;
  padding: 24px 24px 24px 60px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background-color: var(--bg-color);
  font-size: 1.125rem;
  color: var(--text-main);
  box-shadow: var(--shadow-lg);
  transition: all 0.2s;
  outline: none;
}

.search-input::placeholder {
  color: #94A3B8;
}

.search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(0, 82, 255, 0.1), var(--shadow-md);
}

/* Sections */
.section {
  padding: 80px 0;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 32px;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.view-all {
  color: var(--primary);
  font-weight: 600;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

.view-all:hover {
  color: var(--primary-hover);
}

.view-all:hover i {
  transform: translateX(4px);
}

/* Support Category Cards */
.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.category-card {
  background-color: var(--bg-color);
  border-radius: var(--radius-xl);
  padding: 40px 32px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid var(--border-color);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.category-card:hover {
  border-color: transparent;
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

.category-icon {
  width: 56px;
  height: 56px;
  background-color: #EFF6FF;
  color: var(--primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin-bottom: 24px;
  transition: all 0.3s;
}

.category-card:hover .category-icon {
  background-color: var(--primary);
  color: white;
}

.category-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-main);
}

.category-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Popular Articles */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.article-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 28px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  background-color: var(--bg-color);
  transition: all 0.2s;
  cursor: pointer;
}

.article-card:hover {
  border-color: #93C5FD;
  background-color: #F8FAFC;
  box-shadow: var(--shadow-sm);
}

.article-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.article-icon {
  color: #94A3B8;
  font-size: 1.25rem;
}

.article-card h4 {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-main);
}

.article-arrow {
  color: #CBD5E1;
  transition: transform 0.2s, color 0.2s;
}

.article-card:hover .article-arrow {
  color: var(--primary);
  transform: translateX(4px);
}

/* Support Assistance */
.assistance-section {
  background-color: #F8FAFC;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: inset 0 0 0 1px var(--border-color);
}

.assistance-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.assistance-left {
  padding: 64px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.assistance-left h2 {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.assistance-left p {
  color: var(--text-muted);
  font-size: 1.125rem;
  margin-bottom: 40px;
  line-height: 1.6;
}

.chat-action {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}

.wait-time {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
}

.assistance-right {
  background-color: var(--bg-color);
  padding: 64px;
  border-left: 1px solid var(--border-color);
}

.form-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 32px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-main);
}

.form-control {
  width: 100%;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  font-size: 0.95rem;
  font-family: inherit;
  transition: all 0.2s;
  background-color: #F8FAFC;
  color: var(--text-main);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  background-color: var(--bg-color);
  box-shadow: 0 0 0 4px rgba(0, 82, 255, 0.1);
}

.form-control::placeholder {
  color: #94A3B8;
}

textarea.form-control {
  resize: vertical;
  min-height: 140px;
}

.select-wrapper {
  position: relative;
}

.select-control {
  appearance: none;
  cursor: pointer;
  padding-right: 48px;
}

.select-icon {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

/* Resource Cards */
.resources-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.resource-card {
  padding: 32px 24px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  background-color: var(--bg-color);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.resource-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: white;
}

.resource-icon {
  color: var(--primary);
  font-size: 2rem;
  margin-bottom: 24px;
  display: inline-block;
}

.resource-card h4 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-main);
}

.resource-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 24px;
  line-height: 1.6;
}

.resource-link {
  color: var(--primary);
  font-weight: 600;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
}

.resource-link:hover {
  color: var(--primary-hover);
}

/* Footer */
.footer {
  background-color: var(--bg-color);
  border-top: 1px solid var(--border-color);
  padding: 80px 0 32px 0;
  margin-top: 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 64px;
  margin-bottom: 64px;
}

.brand-column {
  padding-right: 24px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-main);
}

.footer-logo i {
  color: var(--primary);
  font-size: 1.5rem;
}

.footer-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 32px;
}

.social-links {
  display: flex;
  gap: 16px;
}

.social-links a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: #F1F5F9;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  transition: all 0.2s;
}

.social-links a:hover {
  background-color: var(--primary);
  color: white;
}

.footer-column h5 {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 24px;
  color: var(--text-main);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
}

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

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #94A3B8;
  font-size: 0.875rem;
}

.footer-bottom-right {
  display: flex;
  align-items: center;
  gap: 24px;
}

.footer-bottom-right span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.footer-bottom-right i {
  font-size: 1.125rem;
}

/* Responsive */
@media (max-width: 1024px) {
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .resources-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .assistance-grid {
    grid-template-columns: 1fr;
  }
  .assistance-right {
    border-left: none;
    border-top: 1px solid var(--border-color);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-left {
    gap: 24px;
  }
  .nav-links {
    display: none;
  }
  .category-grid,
  .articles-grid,
  .resources-grid {
    grid-template-columns: 1fr;
  }
  .hero h1 {
    font-size: 2.25rem;
  }
  .assistance-left,
  .assistance-right {
    padding: 40px;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
  }
}