:root {
    --bg-primary: #f2f2f7;
    --bg-mobile: #ffffff;
    --text-primary: #000000;
    --text-secondary: #737373;
    --brand-blue: #007aff;
    --brand-red: #ff3b30;
    --border-color: #e5e5ea;
    
    --ig-gradient: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
    
    --radius-mobile: 40px;
    --radius-card: 16px;
    
    --shadow-mobile: 0 20px 50px rgba(0,0,0,0.15), 0 0 0 12px #e5e5ea, 0 0 0 14px #d1d1d6;
    --shadow-card: 0 4px 12px rgba(0,0,0,0.05);
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif; }
body { background-color: var(--bg-primary); color: var(--text-primary); line-height: 1.5; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* Navbar */
.nav { padding: 16px 24px; background: rgba(255, 255, 255, 0.8); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border-bottom: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; position: sticky; top: 0; z-index: 100; }
.nav-brand { font-size: 22px; font-weight: 700; background: var(--ig-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.nav-links { display: flex; gap: 24px; }
.nav-links a { font-size: 15px; font-weight: 500; color: var(--text-secondary); transition: 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--text-primary); }
.nav-btn { background: var(--brand-blue); color: #fff; font-size: 14px; font-weight: 600; padding: 6px 16px; border-radius: 16px; transition: 0.2s; }
.nav-btn:hover { opacity: 0.9; }

/* Main Layout */
.app-container { max-width: 1000px; margin: 60px auto; display: flex; gap: 60px; padding: 0 20px; align-items: center; }

/* Mobile Mockup (Left Side) */
.mobile-mockup { width: 320px; height: 650px; background: var(--bg-mobile); border-radius: var(--radius-mobile); box-shadow: var(--shadow-mobile); position: relative; overflow: hidden; flex-shrink: 0; display: flex; flex-direction: column; }
.mobile-notch { position: absolute; top: 0; left: 50%; transform: translateX(-50%); width: 120px; height: 25px; background: #000; border-radius: 0 0 12px 12px; z-index: 10; }
.mobile-header { padding: 40px 20px 10px; display: flex; justify-content: space-between; align-items: center; border-bottom: 0.5px solid var(--border-color); }
.mobile-logo { font-size: 20px; font-weight: 700; font-family: 'Georgia', serif; font-style: italic; }
.mobile-content { flex: 1; overflow-y: auto; padding: 15px; }
.mobile-post { margin-bottom: 20px; }
.mobile-post-img { width: 100%; border-radius: 8px; margin-bottom: 10px; }
.mobile-post-title { font-size: 14px; font-weight: 600; margin-bottom: 4px; }
.mobile-post-desc { font-size: 12px; color: var(--text-secondary); }
.mobile-tabbar { height: 60px; border-top: 0.5px solid var(--border-color); display: flex; justify-content: space-around; align-items: center; padding: 0 20px; padding-bottom: 15px; }
.tab-icon { width: 24px; height: 24px; background: #ccc; border-radius: 50%; }

/* Content Area (Right Side) */
.content-area { flex: 1; }
.hero-tag { font-size: 13px; font-weight: 600; color: var(--brand-blue); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 12px; display: block; }
.hero-title { font-size: 48px; font-weight: 800; line-height: 1.1; letter-spacing: -1px; margin-bottom: 20px; }
.hero-desc { font-size: 17px; color: var(--text-secondary); margin-bottom: 40px; line-height: 1.6; }
.btn-group { display: flex; gap: 12px; margin-bottom: 40px; flex-wrap: wrap; }
.btn { padding: 14px 28px; border-radius: 24px; font-size: 15px; font-weight: 600; cursor: pointer; transition: 0.2s; text-align: center; }
.btn-primary { background: var(--text-primary); color: #fff; }
.btn-primary:hover { opacity: 0.8; }
.btn-secondary { background: #e5e5ea; color: var(--text-primary); }
.btn-secondary:hover { background: #d1d1d6; }

/* Stats (iOS Widget Style) */
.stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-bottom: 60px; }
.stat-box { background: #fff; padding: 24px; border-radius: var(--radius-card); box-shadow: var(--shadow-card); }
.stat-box h3 { font-size: 28px; font-weight: 700; color: var(--text-primary); margin-bottom: 4px; }
.stat-box p { font-size: 13px; font-weight: 500; color: var(--text-secondary); text-transform: uppercase; }

/* Sections Layout */
.section-wrapper { max-width: 1000px; margin: 0 auto; padding: 40px 20px; }
.section-title { font-size: 28px; font-weight: 700; margin-bottom: 40px; letter-spacing: -0.5px; }

/* About - Card Style */
.about-panel { background: #fff; padding: 40px; border-radius: 24px; box-shadow: var(--shadow-card); margin-bottom: 60px; }
.about-panel p { font-size: 16px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 16px; }
.about-panel p:last-child { margin-bottom: 0; }

/* Features - Grid */
.feat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; margin-bottom: 60px; }
.feat-card { background: #fff; padding: 24px; border-radius: var(--radius-card); box-shadow: var(--shadow-card); }
.feat-icon { width: 40px; height: 40px; background: #f2f2f7; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 20px; margin-bottom: 16px; }
.feat-card h3 { font-size: 17px; font-weight: 600; margin-bottom: 8px; }
.feat-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.5; }

/* Guide - Steps */
.guide-list { margin-bottom: 60px; }
.guide-item { display: flex; gap: 20px; margin-bottom: 24px; background: #fff; padding: 24px; border-radius: var(--radius-card); box-shadow: var(--shadow-card); align-items: center; }
.guide-num { width: 36px; height: 36px; background: var(--text-primary); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 16px; flex-shrink: 0; }
.guide-info h3 { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.guide-info p { font-size: 14px; color: var(--text-secondary); }

/* FAQ */
.faq-wrap { margin-bottom: 80px; }
.faq-box { background: #fff; border-radius: var(--radius-card); padding: 20px 24px; margin-bottom: 12px; box-shadow: var(--shadow-card); }
.faq-q { font-size: 16px; font-weight: 600; margin-bottom: 8px; color: var(--brand-blue); }
.faq-a { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }

/* Footer */
.footer { background: #fff; padding: 40px 20px; text-align: center; border-top: 1px solid var(--border-color); }
.footer-brand { font-size: 20px; font-weight: 700; margin-bottom: 20px; }
.footer-links { display: flex; justify-content: center; gap: 24px; margin-bottom: 20px; }
.footer-links a { font-size: 14px; color: var(--text-secondary); font-weight: 500; }
.footer-copy { font-size: 12px; color: #aeaeb2; }

@media (max-width: 992px) {
    .app-container { flex-direction: column; text-align: center; }
    .btn-group { justify-content: center; }
    .nav-links { display: none; }
}
@media (max-width: 480px) {
    .mobile-mockup { width: 100%; height: auto; border-radius: 20px; box-shadow: none; border: 1px solid var(--border-color); }
    .mobile-notch, .mobile-tabbar { display: none; }
    .stats { grid-template-columns: 1fr; }
    .guide-item { flex-direction: column; text-align: center; }
}