/* =========================================
   🎨 GLOBAL VARIABLES & RESET
   ========================================= */
:root {
    --primary: #1E3A5F;
    --primary-light: #2D5A8E;
    --primary-dark: #0F2440;
    --brand-50: #eff6ff;
    --brand-100: #dbeafe;
    --brand-200: #bfdbfe;
    --brand-600: #2563eb;
    --brand-800: #1e40af;
    --brand-900: #1e3a8a;
    --accent-500: #F97316;
    --accent-600: #EA580C;
    --bg: #F8FAFC;
    --text: #334155;
    --text-light: #64748B;
    --white: #ffffff;
    --border: #E2E8F0;
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
    --radius: 20px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; transition: all 0.3s ease; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* =========================================
   🔘 BUTTONS
   ========================================= */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 10px;
    padding: 14px 28px; border-radius: 50px; font-weight: 700; font-size: 16px;
    cursor: pointer; border: none; transition: all 0.3s ease;
}
.btn-primary {
    background: linear-gradient(135deg, var(--accent-500) 0%, var(--accent-600) 100%);
    color: var(--white); box-shadow: 0 4px 14px rgba(249, 115, 22, 0.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(249, 115, 22, 0.5); }
.btn-store, .btn-dark {
    background: var(--white); color: var(--primary); border: 2px solid var(--border);
    padding: 16px 32px; font-size: 17px;
}
.btn-dark { background: var(--brand-900); color: var(--white); border: none; }
.btn-disabled { opacity: 0.6; cursor: not-allowed; background: var(--border); color: var(--text-light); }

/* =========================================
   🧭 HEADER
   ========================================= */
header {
    background: #ffffff;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}
.header-content { display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 22px; font-weight: 800; color: var(--brand-900); display: flex; align-items: center; gap: 10px; }
.logo-img { width: 40px; height: 40px; }
.header-nav { display: flex; gap: 24px; align-items: center; }
.header-nav a { color: var(--text); font-weight: 500; font-size: 15px; }
.header-nav a:hover { color: var(--accent-500); }

/* =========================================
   🖼️ HERO
   ========================================= */
.hero { padding: 60px 0; text-align: center; background: linear-gradient(180deg, var(--brand-50) 0%, var(--bg) 100%); }
.hero-badge {
    display: inline-block; background: var(--brand-100); color: var(--brand-600);
    font-size: 13px; font-weight: 700; padding: 6px 16px; border-radius: 50px;
    margin-bottom: 24px; text-transform: uppercase;
}
.hero h1 { font-size: clamp(2.2rem, 5vw, 3.8rem); line-height: 1.1; color: var(--brand-900); margin-bottom: 20px; font-weight: 900; }
.hero h1 span { color: var(--accent-500); }
.hero p.lead { font-size: clamp(1.05rem, 2vw, 1.3rem); color: var(--text-light); max-width: 640px; margin: 0 auto 20px; }
.hero-notice {
    display: inline-block; background: #FEF3C7; color: #92400E; font-size: 14px; font-weight: 600;
    padding: 8px 16px; border-radius: 50px; margin-bottom: 24px; border: 1px solid #F59E0B;
}
.hero-buttons { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-bottom: 24px; }
.hero-trust { font-size: 14px; color: var(--text-light); display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-image { max-width: 450px; margin: 40px auto; }

/* =========================================
   📦 SECTIONS & GRIDS
   ========================================= */
section { padding: 60px 0; }
.section-title { text-align: center; font-size: clamp(1.8rem, 4vw, 2.5rem); color: var(--brand-900); margin-bottom: 16px; font-weight: 800; }
.section-subtitle { text-align: center; color: var(--text-light); font-size: 1.1rem; max-width: 600px; margin: 0 auto 48px; }

.info-block { padding: 48px 0; }
.info-block-content { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 24px; }
.info-block-text { flex: 1; min-width: 300px; }
.info-block h3 { font-size: 1.5rem; color: var(--brand-900); margin-bottom: 12px; font-weight: 700; }
.info-block-btn a {
    display: inline-block; background: var(--accent-500); color: white; padding: 16px 32px;
    border-radius: 50px; font-weight: 600; box-shadow: 0 4px 14px rgba(249, 115, 22, 0.4); transition: transform 0.3s;
}
.info-block-btn a:hover { transform: translateY(-2px); }

.features { background: var(--white); }
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.feature-card { background: var(--bg); padding: 36px 28px; border-radius: 24px; text-align: center; border: 1px solid var(--border); transition: transform 0.3s, box-shadow 0.3s; }
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.feature-icon { width: 64px; height: 64px; background: var(--brand-100); color: var(--brand-600); border-radius: 20px; display: flex; align-items: center; justify-content: center; font-size: 32px; margin: 0 auto 20px; font-weight: 700; }
.feature-card h3 { font-size: 1.3rem; color: var(--brand-900); margin-bottom: 12px; }
.feature-card p { color: var(--text-light); font-size: 15px; }

.steps { background: var(--brand-900); color: var(--white); }
.steps .section-title { color: var(--white); }
.steps-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 40px; text-align: center; }
.step-number { width: 72px; height: 72px; background: linear-gradient(135deg, var(--accent-500) 0%, var(--accent-600) 100%); color: var(--white); font-size: 28px; font-weight: 800; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: 0 auto 24px; }
.step-card h3 { font-size: 1.3rem; margin-bottom: 10px; }
.step-card p { color: var(--brand-100); font-size: 15px; }

.science { background: linear-gradient(135deg, #F0F9FF 0%, #E0F2FE 100%); }
.science-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 32px; margin-top: 40px; }
.science-card { background: white; padding: 32px; border-radius: 20px; border: 1px solid var(--border); box-shadow: 0 4px 12px rgba(0,0,0,0.05); }
.science-card h3 { color: var(--brand-900); margin-bottom: 12px; font-size: 1.3rem; }
.science-card cite { display: block; font-size: 0.85rem; color: var(--text-light); font-style: normal; border-left: 3px solid var(--accent-500); padding-left: 12px; margin-top: 12px; }

.testimonials { background: var(--bg); }
.testimonials-placeholder { text-align: center; background: var(--white); padding: 48px 32px; border-radius: 20px; border: 2px dashed var(--border); max-width: 600px; margin: 0 auto; }

.cta { background: linear-gradient(135deg, var(--accent-500) 0%, var(--accent-600) 100%); color: var(--white); text-align: center; padding: 60px 20px; margin: 40px 20px; border-radius: 32px; }
.cta-content { max-width: 700px; margin: 0 auto; }
.cta h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); margin-bottom: 16px; }
.cta .btn-primary { background: var(--white); color: var(--accent-600); padding: 16px 40px; font-size: 17px; }

footer { background: var(--white); padding: 40px 0; text-align: center; color: var(--text-light); font-size: 14px; border-top: 1px solid var(--border); }
.disclaimer { font-size: 12px; color: #94A3B8; margin-top: 8px; }

/* =========================================
   📄 ARTICLE PAGES
   ========================================= */
.article-container { max-width: 800px; margin: 0 auto; padding: 40px 20px 80px; }
.breadcrumb { font-size: 14px; color: var(--text-light); margin-bottom: 24px; }
.breadcrumb a { color: var(--brand-600); }
.article-header h1 { font-size: clamp(2rem, 4vw, 2.8rem); color: var(--brand-900); margin-bottom: 12px; line-height: 1.2; }
.article-meta { font-size: 14px; color: var(--text-light); margin-bottom: 32px; padding-bottom: 24px; border-bottom: 1px solid var(--border); }
.article-intro .lead { font-size: 1.15rem; color: var(--text); margin-bottom: 32px; }
.article-container h2 { font-size: 1.8rem; color: var(--brand-900); margin: 40px 0 16px; }
.article-container h3 { font-size: 1.3rem; color: var(--brand-800); margin: 24px 0 12px; }
.article-container p, .article-container ul, .article-container ol { margin-bottom: 16px; color: var(--text); }
.article-container ul, .article-container ol { padding-left: 24px; }
.article-container li { margin-bottom: 8px; }
.article-container blockquote { background: var(--brand-50); border-left: 4px solid var(--accent-500); padding: 20px; margin: 24px 0; border-radius: 0 12px 12px 0; font-style: italic; }
.article-container blockquote cite { display: block; margin-top: 12px; font-size: 0.9rem; color: var(--text-light); font-style: normal; }
.article-cta { background: var(--bg); padding: 32px; border-radius: 20px; text-align: center; margin-top: 40px; }
.article-cta h2 { margin-top: 0; }
.article-footer { margin-top: 48px; padding-top: 32px; border-top: 1px solid var(--border); }
.article-footer h3 { font-size: 1.3rem; margin-bottom: 16px; }
.article-footer ol { padding-left: 20px; }
.article-footer li { margin-bottom: 8px; font-size: 0.95rem; color: var(--text-light); }

/* =========================================
   📱 MOBILE
   ========================================= */
@media (max-width: 768px) {
    .header-nav a:not(.btn) { display: none; }
    .hero { padding: 40px 0; }
    .hero-image { max-width: 320px; }
    .info-block-content { flex-direction: column; text-align: center; }
    .btn-store, .btn-dark { width: 100%; max-width: 300px; }
    .cta { margin: 20px 10px; padding: 40px 20px; }
    .article-container { padding: 24px 16px 60px; }
}
.science-card-link { display: block; text-decoration: none; color: inherit; transition: transform 0.3s ease; }
.science-card-link:hover { transform: translateY(-8px); }
.science-card-link .science-card { height: 100%; cursor: pointer; position: relative; overflow: hidden; }
.card-cta { display: inline-block; margin-top: 14px; color: var(--accent-500); font-weight: 600; font-size: 0.9rem; transition: color 0.2s, transform 0.2s; }
.science-card-link:hover .card-cta { color: var(--accent-600); transform: translateX(4px); }