@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  --primary: #2563EB;
  --primary-dark: #1D4ED8;
  --primary-light: #EFF6FF;
  --bg: #FFFFFF;
  --card-bg: #F9FAFB;
  --text: #111827;
  --text-secondary: #6B7280;
  --border: #E5E7EB;
  --success: #10B981;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
  --radius: 8px;
  --radius-lg: 12px;
  --font: 'Inter', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); color: var(--text); background: var(--bg); line-height: 1.6; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

h1 { font-size: clamp(2rem, 5vw, 3.25rem); font-weight: 800; line-height: 1.2; }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); font-weight: 700; line-height: 1.3; }
h3 { font-size: 1.2rem; font-weight: 600; }
p { color: var(--text-secondary); line-height: 1.7; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 { color: var(--text); margin-bottom: 12px; }
.section-header p { font-size: 1.0625rem; max-width: 580px; margin: 0 auto; }

/* NAVBAR */
.navbar { position: sticky; top: 0; z-index: 1000; background: rgba(255,255,255,0.96); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border); }
.nav-inner { max-width: 1200px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; height: 64px; }
.nav-logo { font-size: 1.5rem; font-weight: 800; color: var(--primary); }
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a { font-size: 0.9375rem; font-weight: 500; color: var(--text-secondary); transition: color 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-cta { display: flex; align-items: center; gap: 12px; }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 4px; }
.hamburger span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; }
.mobile-menu { display: none; position: fixed; top: 64px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--border); padding: 20px 24px; flex-direction: column; gap: 16px; z-index: 999; box-shadow: var(--shadow-md); }
.mobile-menu.open { display: flex; }
.mobile-menu a { font-size: 1rem; font-weight: 500; color: var(--text); padding: 8px 0; border-bottom: 1px solid var(--border); }

/* BUTTONS */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 10px 24px; border-radius: var(--radius); font-size: 0.9375rem; font-weight: 600; cursor: pointer; transition: all 0.2s; border: none; font-family: var(--font); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-secondary { background: transparent; color: var(--primary); border: 1.5px solid var(--primary); }
.btn-secondary:hover { background: var(--primary-light); }
.btn-sm { padding: 8px 16px; font-size: 0.875rem; }
.btn-lg { padding: 14px 32px; font-size: 1rem; }
.btn-full { width: 100%; }

/* HERO */
.hero { padding: 100px 0 80px; background: linear-gradient(135deg, #EFF6FF 0%, #FFFFFF 60%); }
.hero-inner { max-width: 1200px; margin: 0 auto; padding: 0 24px; display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; background: var(--primary-light); color: var(--primary); padding: 6px 14px; border-radius: 20px; font-size: 0.8125rem; font-weight: 600; margin-bottom: 20px; }
.hero-title { color: var(--text); margin-bottom: 20px; }
.hero-title span { color: var(--primary); }
.hero-desc { font-size: 1.0625rem; margin-bottom: 36px; max-width: 480px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 40px; margin-top: 48px; padding-top: 32px; border-top: 1px solid var(--border); }
.hero-stat strong { font-size: 1.75rem; font-weight: 800; color: var(--text); display: block; }
.hero-stat span { font-size: 0.8125rem; color: var(--text-secondary); }
.hero-visual { background: #fff; border-radius: var(--radius-lg); padding: 32px; box-shadow: var(--shadow-lg); border: 1px solid var(--border); }
.hero-card-header { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }
.hero-card-icon { width: 52px; height: 52px; background: var(--primary-light); border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; }
.hero-card-title { font-weight: 700; color: var(--text); }
.hero-card-sub { font-size: 0.875rem; color: var(--text-secondary); }
.progress-row { margin-bottom: 16px; }
.progress-label { display: flex; justify-content: space-between; font-size: 0.875rem; margin-bottom: 6px; }
.progress-label span:first-child { color: var(--text); font-weight: 500; }
.progress-label span:last-child { color: var(--primary); font-weight: 600; }
.progress-bar { height: 6px; background: var(--border); border-radius: 4px; overflow: hidden; }
.progress-fill { height: 100%; background: var(--primary); border-radius: 4px; }
.hero-card-footer { display: flex; justify-content: space-between; align-items: center; margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--border); font-size: 0.875rem; }
.hero-card-footer span { color: var(--text-secondary); }
.hero-card-footer strong { color: var(--success); }

/* TRUST SECTION */
.trust-section { padding: 40px 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--card-bg); }
.trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.trust-item { display: flex; align-items: center; gap: 14px; }
.trust-icon { width: 44px; height: 44px; background: var(--primary-light); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 1.25rem; flex-shrink: 0; }
.trust-item h4 { font-size: 0.9375rem; color: var(--text); margin-bottom: 2px; }
.trust-item p { font-size: 0.8125rem; margin: 0; }

/* PRODUCT CARDS */
.products-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.product-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; transition: all 0.2s; }
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.product-thumb { height: 200px; background: linear-gradient(135deg, #EFF6FF, #DBEAFE); display: flex; align-items: center; justify-content: center; font-size: 3rem; position: relative; overflow: hidden; }
.product-thumb img { width: 100%; height: 100%; object-fit: cover; object-position: center top; display: block; }
.product-badge { position: absolute; top: 12px; left: 12px; background: var(--primary); color: #fff; padding: 4px 10px; border-radius: 4px; font-size: 0.75rem; font-weight: 600; }
.product-badge.green { background: var(--success); }
.product-body { padding: 20px; }
.product-category { font-size: 0.75rem; font-weight: 600; color: var(--primary); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 8px; }
.product-title { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 8px; line-height: 1.4; }
.product-desc { font-size: 0.875rem; color: var(--text-secondary); margin-bottom: 16px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.product-footer { display: flex; align-items: center; justify-content: space-between; padding-top: 16px; border-top: 1px solid var(--border); }
.product-price { font-size: 1.25rem; font-weight: 800; color: var(--text); }
.product-price-original { font-size: 0.875rem; color: var(--text-secondary); font-weight: 400; text-decoration: line-through; margin-right: 4px; }
.stars { color: #F59E0B; font-size: 0.875rem; }
.rating-text { font-size: 0.8125rem; color: var(--text-secondary); margin-left: 4px; }

/* TESTIMONIALS */
.testimonials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.testimonial-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 28px; }
.testimonial-stars { color: #F59E0B; margin-bottom: 16px; font-size: 1rem; }
.testimonial-text { font-size: 0.9375rem; color: var(--text); line-height: 1.7; margin-bottom: 20px; font-style: italic; }
.testimonial-author { display: flex; align-items: center; gap: 12px; }
.author-avatar { width: 44px; height: 44px; border-radius: 50%; background: linear-gradient(135deg, var(--primary), #60A5FA); display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 700; font-size: 1rem; flex-shrink: 0; }
.author-name { font-weight: 600; color: var(--text); font-size: 0.9375rem; }
.author-role { font-size: 0.8125rem; color: var(--text-secondary); }

/* FOOTER */
.footer { background: #111827; color: #9CA3AF; padding: 64px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand .footer-logo { font-size: 1.5rem; font-weight: 800; color: #fff; display: block; margin-bottom: 12px; }
.footer-brand p { font-size: 0.875rem; max-width: 280px; line-height: 1.8; }
.footer-email { color: #60A5FA; font-size: 0.875rem; margin-top: 14px; display: block; }
.footer-col h5 { color: #fff; font-size: 0.8125rem; font-weight: 600; margin-bottom: 16px; text-transform: uppercase; letter-spacing: 0.08em; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col a { font-size: 0.875rem; transition: color 0.2s; }
.footer-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid #1F2937; padding-top: 24px; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; }
.footer-bottom p { font-size: 0.8125rem; }
.payment-badges { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.pay-badge { background: #1F2937; border: 1px solid #374151; border-radius: 5px; padding: 5px 10px; font-size: 0.75rem; color: #D1D5DB; font-weight: 600; }
.secure-badge { display: flex; align-items: center; gap: 5px; font-size: 0.75rem; color: #34D399; font-weight: 500; }

/* FORMS */
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-size: 0.875rem; font-weight: 600; color: var(--text); margin-bottom: 6px; }
.form-input, .form-textarea { width: 100%; padding: 10px 14px; border: 1.5px solid var(--border); border-radius: var(--radius); font-size: 0.9375rem; font-family: var(--font); color: var(--text); background: #fff; transition: border-color 0.2s; }
.form-input:focus, .form-textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.1); }
.form-textarea { resize: vertical; min-height: 130px; }
.alert { padding: 12px 16px; border-radius: var(--radius); font-size: 0.9375rem; margin-bottom: 16px; display: none; }
.alert-success { background: #DCFCE7; color: #15803D; border: 1px solid #BBF7D0; }
.alert-error { background: #FEF2F2; color: #DC2626; border: 1px solid #FECACA; }

/* PAGE HERO */
.page-hero { padding: 60px 0 44px; background: linear-gradient(135deg, #EFF6FF 0%, #FFFFFF 100%); border-bottom: 1px solid var(--border); }
.page-hero h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); color: var(--text); margin-bottom: 12px; }
.page-hero p { font-size: 1.0625rem; max-width: 600px; }
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 0.875rem; color: var(--text-secondary); margin-bottom: 16px; }
.breadcrumb a { color: var(--primary); }

/* FILTERS */
.filter-bar { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 32px; }
.filter-btn { padding: 8px 20px; border-radius: 20px; border: 1.5px solid var(--border); background: #fff; color: var(--text-secondary); font-size: 0.875rem; font-weight: 500; cursor: pointer; transition: all 0.2s; font-family: var(--font); }
.filter-btn.active, .filter-btn:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 8px; }
.faq-item { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.faq-question { padding: 18px 20px; font-weight: 600; color: var(--text); cursor: pointer; display: flex; justify-content: space-between; align-items: center; background: #fff; user-select: none; font-size: 0.9375rem; }
.faq-icon { font-size: 1.25rem; color: var(--primary); font-weight: 400; transition: transform 0.2s; flex-shrink: 0; }
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-answer { display: none; padding: 0 20px 18px; color: var(--text-secondary); font-size: 0.9375rem; line-height: 1.7; }
.faq-item.open .faq-answer { display: block; }

/* PRODUCT DETAIL */
.product-detail-grid { display: grid; grid-template-columns: 1fr 360px; gap: 48px; align-items: start; }
.price-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 28px; position: sticky; top: 80px; }
.price-display { margin-bottom: 20px; }
.price-display .current-price { font-size: 2.25rem; font-weight: 800; color: var(--text); }
.price-display .original-price { font-size: 1rem; color: var(--text-secondary); text-decoration: line-through; margin-right: 8px; }
.discount-badge { background: #DCFCE7; color: #15803D; padding: 3px 8px; border-radius: 4px; font-size: 0.8125rem; font-weight: 700; }
.secure-icons { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border); }
.secure-icon-item { font-size: 0.75rem; color: var(--text-secondary); display: flex; align-items: center; gap: 4px; background: var(--card-bg); padding: 4px 8px; border-radius: 4px; }
.what-learn-list { display: flex; flex-direction: column; gap: 10px; margin-top: 16px; }
.what-learn-list li { display: flex; gap: 10px; font-size: 0.9375rem; color: var(--text); }
.what-learn-list li::before { content: '✓'; color: var(--success); font-weight: 700; flex-shrink: 0; }

/* LEGAL */
.legal-content h2 { font-size: 1.375rem; color: var(--text); margin: 36px 0 12px; }
.legal-content h3 { font-size: 1.0625rem; color: var(--text); margin: 24px 0 8px; }
.legal-content p, .legal-content li { font-size: 0.9375rem; color: #374151; line-height: 1.8; margin-bottom: 12px; }
.legal-content ul, .legal-content ol { padding-left: 20px; margin-bottom: 16px; }
.legal-content li { margin-bottom: 6px; }
.legal-meta { background: var(--card-bg); border-left: 4px solid var(--primary); padding: 16px 20px; border-radius: 0 var(--radius) var(--radius) 0; margin-bottom: 32px; font-size: 0.875rem; color: var(--text-secondary); }

/* ABOUT */
.values-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.value-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 28px; text-align: center; }
.value-icon { font-size: 2.5rem; margin-bottom: 16px; }
.value-card h3 { color: var(--text); margin-bottom: 8px; }
.mission-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.mission-visual { background: linear-gradient(135deg, var(--primary-light), #DBEAFE); border-radius: var(--radius-lg); height: 320px; display: flex; align-items: center; justify-content: center; font-size: 5rem; }

/* CONTACT */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; }
.contact-info-item { display: flex; gap: 16px; margin-bottom: 28px; }
.contact-icon { width: 48px; height: 48px; background: var(--primary-light); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 1.25rem; flex-shrink: 0; }
.contact-info-item h4 { color: var(--text); margin-bottom: 4px; }
.contact-info-item p { font-size: 0.9375rem; margin: 0; }

/* RESPONSIVE */
@media (max-width: 1024px) {
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 768px) {
  .nav-links, .nav-cta { display: none; }
  .hamburger { display: flex; }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .trust-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .products-grid { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .product-detail-grid { grid-template-columns: 1fr; }
  .price-card { position: static; }
  .contact-grid { grid-template-columns: 1fr; }
  .mission-grid { grid-template-columns: 1fr; }
  .values-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 480px) {
  .trust-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
}