/* ============================================
   Bizmate POS - Website Style
   Màu chủ đạo: Xanh dương & Trắng
   ============================================ */

:root {
  --primary: #1e3a5f;
  --primary-light: #2d5a8a;
  --primary-dark: #152a45;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --white: #ffffff;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-400: #94a3b8;
  --gray-600: #475569;
  --gray-800: #1e293b;
  --shadow: 0 4px 6px -1px rgba(30, 58, 95, 0.1), 0 2px 4px -2px rgba(30, 58, 95, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(30, 58, 95, 0.1), 0 4px 6px -4px rgba(30, 58, 95, 0.1);
  --radius: 12px;
  --radius-lg: 16px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  color: var(--gray-800);
  background: var(--white);
  line-height: 1.6;
  min-height: 100vh;
}

/* ----- Header & Navigation ----- */
.site-header {
  background: var(--white);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo:hover {
  color: var(--primary-light);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
}

.nav-menu a {
  color: var(--gray-600);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  font-weight: 500;
  transition: color var(--transition), background var(--transition);
}

.nav-menu a:hover {
  color: var(--primary);
  background: var(--gray-100);
}

.nav-menu a.active {
  color: var(--primary);
  background: var(--gray-100);
}

/* ----- Buttons ----- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

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

.btn-download {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: var(--white);
  font-size: 1.1rem;
  padding: 1rem 2rem;
}

.btn-download:hover {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* ----- Main content wrapper ----- */
.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* ----- Hero Section ----- */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 50%, var(--primary-dark) 100%);
  color: var(--white);
  padding: 4rem 1.5rem;
  text-align: center;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  font-weight: 700;
  text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.hero p {
  font-size: 1.2rem;
  opacity: 0.95;
  max-width: 600px;
  margin: 0 auto 2rem;
}

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

.hero .btn-download:hover {
  background: var(--gray-100);
  color: var(--primary-dark);
}

/* ----- Section titles ----- */
.section-title {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
  font-weight: 700;
}

.section-subtitle {
  color: var(--gray-600);
  margin-bottom: 2rem;
  max-width: 560px;
}

/* ----- Features Section ----- */
.features {
  padding: 4rem 1.5rem;
  background: var(--gray-50);
}

.features-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--white);
  padding: 2rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  border: 1px solid var(--gray-200);
}

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

.feature-card .icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  color: var(--primary);
  margin-bottom: 0.5rem;
  font-size: 1.2rem;
}

.feature-card p {
  color: var(--gray-600);
  font-size: 0.95rem;
}

/* ----- Pricing Section ----- */
.pricing {
  padding: 4rem 1.5rem;
}

.pricing-grid {
  max-width: 1000px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  align-items: stretch;
}

.pricing-card {
  background: var(--white);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.pricing-card:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
  border-color: var(--accent);
  background: linear-gradient(180deg, var(--gray-50) 0%, var(--white) 30%);
  position: relative;
}

.pricing-card.featured::before {
  content: 'Phổ biến';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: var(--white);
  padding: 0.25rem 1rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
}

.pricing-card h3 {
  color: var(--primary);
  margin-bottom: 0.5rem;
  font-size: 1.3rem;
}

.pricing-card .price {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary);
  margin: 1rem 0;
}

.pricing-card .price-note {
  font-size: 0.9rem;
  color: var(--gray-600);
  margin-bottom: 1.5rem;
}

.pricing-card ul {
  list-style: none;
  text-align: left;
  margin-bottom: 1.5rem;
}

.pricing-card ul li {
  padding: 0.5rem 0;
  color: var(--gray-600);
  border-bottom: 1px solid var(--gray-100);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.pricing-card ul li::before {
  content: '✓';
  color: var(--accent);
  font-weight: bold;
}

/* ----- CTA / Download Section ----- */
.cta-section {
  background: var(--gray-50);
  padding: 4rem 1.5rem;
  text-align: center;
}

.cta-section h2 {
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.cta-section p {
  color: var(--gray-600);
  margin-bottom: 1.5rem;
}

/* ----- Footer ----- */
.site-footer {
  background: var(--primary-dark);
  color: var(--white);
  padding: 2rem 1.5rem;
  margin-top: 3rem;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.footer-inner a {
  color: rgba(255,255,255,0.9);
  text-decoration: none;
}

.footer-inner a:hover {
  text-decoration: underline;
}

/* ----- Page header (inner pages) ----- */
.page-header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: var(--white);
  padding: 2.5rem 1.5rem;
  margin-bottom: 2rem;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.page-header h1 {
  max-width: 1200px;
  margin: 0 auto;
  font-size: 2rem;
}

.page-header p {
  max-width: 1200px;
  margin: 0.5rem auto 0;
  opacity: 0.9;
  font-size: 1rem;
}

/* ----- Blog / List pages ----- */
.article-list {
  list-style: none;
}

.article-list li {
  border-bottom: 1px solid var(--gray-200);
  padding: 1.25rem 0;
}

.article-list li:first-child {
  padding-top: 0;
}

.article-list a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.1rem;
  display: block;
  margin-bottom: 0.35rem;
}

.article-list a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.article-meta {
  font-size: 0.9rem;
  color: var(--gray-600);
}

/* ----- Single article / template content ----- */
.article-content {
  max-width: 720px;
  margin: 0 auto;
}

.article-content h1 {
  color: var(--primary);
  margin-bottom: 1rem;
  font-size: 2rem;
}

.article-content .meta {
  color: var(--gray-600);
  font-size: 0.95rem;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--gray-200);
}

.article-content h2 {
  color: var(--primary);
  margin: 2rem 0 0.75rem;
  font-size: 1.4rem;
}

.article-content h3 {
  color: var(--gray-800);
  margin: 1.5rem 0 0.5rem;
  font-size: 1.15rem;
}

.article-content p {
  margin-bottom: 1rem;
  color: var(--gray-800);
}

.article-content ul, .article-content ol {
  margin: 1rem 0 1rem 1.5rem;
}

.article-content li {
  margin-bottom: 0.5rem;
}

.article-content a {
  color: var(--accent);
  text-decoration: none;
}

.article-content a:hover {
  text-decoration: underline;
}

.article-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  margin: 1rem 0;
}

/* ----- Breadcrumb ----- */
.breadcrumb {
  font-size: 0.9rem;
  color: var(--gray-600);
  margin-bottom: 1.5rem;
}

.breadcrumb a {
  color: var(--accent);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

/* ----- Responsive ----- */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 1.75rem;
  }
  .hero p {
    font-size: 1rem;
  }
  .section-title {
    font-size: 1.5rem;
  }
  .nav-menu {
    width: 100%;
    justify-content: flex-start;
  }
  .pricing-card .price {
    font-size: 2rem;
  }
}