:root {
    --bg-primary: #f0f4f8; /* Soft light blue/gray background */
    --bg-secondary: #ffffff;
    --text-primary: #1a1a2e; /* Deep blue-gray text */
    --text-secondary: #4a5568;
    --border-color: rgba(255,255,255,0.4); /* Glassmorphism borders */
    
    /* Windows 11 Fluent Design Accent */
    --brand-blue: #0067c0;
    --brand-purple: #8327a4;
    --brand-pink: #d13481;
    
    --ig-gradient: linear-gradient(135deg, var(--brand-blue), var(--brand-purple), var(--brand-pink));
    
    /* Acrylic Material (Mica effect) */
    --acrylic-bg: rgba(255, 255, 255, 0.7);
    --acrylic-backdrop: blur(20px) saturate(150%);
    
    /* Fluent Shadows */
    --shadow-flyout: 0 8px 16px rgba(0, 0, 0, 0.14), 0 0 2px rgba(0, 0, 0, 0.12);
    --shadow-card: 0 4px 8px rgba(0, 0, 0, 0.04), 0 0 2px rgba(0, 0, 0, 0.06), inset 0 1px 0 rgba(255,255,255,0.4);
    
    --border-radius: 8px; /* Win11 uses 8px typically for controls, 12px for flyouts */
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI Variable', 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, 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; transition: 0.2s; }
ul { list-style: none; }

/* Bloom Background Effect (Win11 style wallpaper hint) */
body::before {
    content: '';
    position: fixed;
    top: -20vh; right: -10vw;
    width: 60vw; height: 60vh;
    background: radial-gradient(circle, rgba(131, 39, 164, 0.15) 0%, transparent 60%);
    z-index: -1; pointer-events: none;
    filter: blur(40px);
}
body::after {
    content: '';
    position: fixed;
    bottom: -20vh; left: -10vw;
    width: 50vw; height: 50vh;
    background: radial-gradient(circle, rgba(0, 103, 192, 0.15) 0%, transparent 60%);
    z-index: -1; pointer-events: none;
    filter: blur(40px);
}

/* Acrylic Navbar */
.nav { background: var(--acrylic-bg); backdrop-filter: var(--acrylic-backdrop); -webkit-backdrop-filter: var(--acrylic-backdrop); border-bottom: 1px solid var(--border-color); padding: 12px 5%; display: flex; justify-content: space-between; align-items: center; position: sticky; top: 0; z-index: 1000; box-shadow: 0 1px 3px rgba(0,0,0,0.05); }
.nav-brand { font-size: 20px; font-weight: 600; display: flex; align-items: center; gap: 8px; }
.nav-brand::before { content: '◎'; font-size: 24px; background: var(--ig-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.nav-links { display: flex; gap: 24px; }
.nav-links a { font-size: 14px; font-weight: 500; color: var(--text-primary); padding: 6px 12px; border-radius: 4px; transition: background 0.1s; }
.nav-links a:hover { background: rgba(0,0,0,0.05); }
.nav-links a.active { background: rgba(0,0,0,0.05); font-weight: 600; }
.nav-btn { background: var(--brand-blue); color: #fff !important; padding: 6px 20px; border-radius: 4px; font-size: 14px; font-weight: 600; border: 1px solid transparent; box-shadow: 0 1px 2px rgba(0,0,0,0.1), inset 0 1px 0 rgba(255,255,255,0.2); }
.nav-btn:hover { background: #005a9e; }

/* Hero */
.hero { text-align: center; padding: 100px 20px 80px; max-width: 1000px; margin: 0 auto; position: relative; }
.hero-tag { display: inline-block; padding: 4px 12px; background: var(--acrylic-bg); backdrop-filter: var(--acrylic-backdrop); -webkit-backdrop-filter: var(--acrylic-backdrop); border: 1px solid var(--border-color); color: var(--brand-blue); border-radius: 4px; font-size: 12px; font-weight: 600; margin-bottom: 24px; box-shadow: var(--shadow-card); }
.hero h1 { font-size: 52px; font-weight: 600; line-height: 1.2; margin-bottom: 24px; letter-spacing: -1px; }
.hero h1 span { background: var(--ig-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero p { font-size: 18px; color: var(--text-secondary); margin-bottom: 40px; font-weight: 400; max-width: 600px; margin-inline: auto; }

.btn-group { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn { padding: 10px 32px; border-radius: 4px; font-size: 14px; font-weight: 600; cursor: pointer; transition: 0.1s; display: inline-flex; align-items: center; justify-content: center; }
.btn-primary { background: var(--brand-blue); color: #fff; border: 1px solid transparent; box-shadow: 0 1px 2px rgba(0,0,0,0.1), inset 0 1px 0 rgba(255,255,255,0.2); }
.btn-primary:hover { background: #005a9e; }
.btn-primary:active { background: #004c87; transform: scale(0.98); }
.btn-secondary { background: var(--acrylic-bg); backdrop-filter: var(--acrylic-backdrop); color: var(--text-primary); border: 1px solid rgba(0,0,0,0.1); box-shadow: var(--shadow-card); }
.btn-secondary:hover { background: rgba(250,250,250,0.8); }
.btn-secondary:active { background: rgba(240,240,240,0.8); transform: scale(0.98); }

/* Stats - Fluent Cards */
.stats { display: flex; justify-content: center; gap: 20px; padding: 0 20px 80px; flex-wrap: wrap; max-width: 1200px; margin: 0 auto; }
.stat-box { background: var(--acrylic-bg); backdrop-filter: var(--acrylic-backdrop); -webkit-backdrop-filter: var(--acrylic-backdrop); border: 1px solid var(--border-color); border-radius: var(--border-radius); padding: 24px 30px; text-align: center; flex: 1; min-width: 200px; box-shadow: var(--shadow-card); transition: transform 0.2s, box-shadow 0.2s; }
.stat-box:hover { transform: translateY(-2px); box-shadow: var(--shadow-flyout); }
.stat-box h3 { font-size: 32px; font-weight: 600; margin-bottom: 4px; color: var(--text-primary); }
.stat-box p { font-size: 13px; font-weight: 500; color: var(--text-secondary); }

/* Base Layout */
.container { max-width: 1200px; margin: 0 auto; padding: 40px 20px; }
.section-title { font-size: 28px; font-weight: 600; text-align: center; margin-bottom: 50px; }

/* About - Window Style */
.about-panel { background: var(--acrylic-bg); backdrop-filter: var(--acrylic-backdrop); -webkit-backdrop-filter: var(--acrylic-backdrop); border: 1px solid var(--border-color); padding: 60px; border-radius: 12px; margin-bottom: 80px; text-align: center; box-shadow: var(--shadow-flyout); position: relative; overflow: hidden; }
.about-panel::before { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 4px; background: var(--ig-gradient); }
.about-panel p { font-size: 16px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 20px; font-weight: 400; max-width: 800px; margin-inline: auto; }
.about-panel p:last-child { margin-bottom: 0; }

/* Features - Fluent Grid */
.feat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 24px; margin-bottom: 80px; }
.feat-card { background: var(--acrylic-bg); backdrop-filter: var(--acrylic-backdrop); -webkit-backdrop-filter: var(--acrylic-backdrop); border: 1px solid var(--border-color); padding: 30px; border-radius: var(--border-radius); box-shadow: var(--shadow-card); transition: 0.2s; position: relative; }
.feat-card:hover { background: rgba(255,255,255,0.9); box-shadow: var(--shadow-flyout); }
.feat-icon { font-size: 28px; margin-bottom: 16px; color: var(--brand-blue); display: inline-block; }
.feat-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 10px; color: var(--text-primary); }
.feat-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }

/* Images - Window Mockup Style */
.window-mockup { background: var(--acrylic-bg); backdrop-filter: var(--acrylic-backdrop); border: 1px solid var(--border-color); border-radius: 12px; padding: 12px; padding-top: 36px; position: relative; margin-bottom: 80px; box-shadow: var(--shadow-flyout); }
.window-mockup::before { content: '...'; position: absolute; top: 8px; left: 16px; font-size: 18px; color: #a0a0a0; line-height: 1; letter-spacing: 2px; }
.window-img { width: 100%; display: block; border-radius: 4px; border: 1px solid rgba(0,0,0,0.1); }

/* Guide - Timeline */
.guide-list { max-width: 900px; margin: 0 auto 80px; }
.guide-item { display: flex; gap: 24px; background: var(--acrylic-bg); backdrop-filter: var(--acrylic-backdrop); border: 1px solid var(--border-color); box-shadow: var(--shadow-card); padding: 24px 32px; border-radius: var(--border-radius); margin-bottom: 16px; align-items: center; transition: 0.2s; }
.guide-item:hover { background: rgba(255,255,255,0.9); }
.guide-num { width: 40px; height: 40px; background: var(--brand-blue); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 18px; font-weight: 600; box-shadow: 0 2px 4px rgba(0,103,192,0.3); }
.guide-info h3 { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.guide-info p { font-size: 14px; color: var(--text-secondary); }

/* FAQ - Expander Style */
.faq-wrap { max-width: 800px; margin: 0 auto 80px; }
.faq-box { background: var(--acrylic-bg); backdrop-filter: var(--acrylic-backdrop); border: 1px solid var(--border-color); box-shadow: var(--shadow-card); border-radius: var(--border-radius); margin-bottom: 12px; padding: 20px 24px; transition: 0.2s; }
.faq-box:hover { background: rgba(255,255,255,0.9); }
.faq-q { font-size: 16px; font-weight: 600; margin-bottom: 12px; color: var(--text-primary); display: flex; gap: 12px; align-items: flex-start; }
.faq-q::before { content: '\e9ce'; font-family: 'Segoe Fluent Icons', sans-serif; font-size: 16px; color: var(--brand-blue); font-weight: normal; margin-top: 2px; }
.faq-a { font-size: 14px; color: var(--text-secondary); padding-left: 28px; line-height: 1.6; }

/* Footer */
.footer { background: var(--acrylic-bg); backdrop-filter: var(--acrylic-backdrop); border-top: 1px solid var(--border-color); padding: 40px 20px; text-align: center; }
.footer-links { display: flex; justify-content: center; gap: 24px; margin-bottom: 24px; flex-wrap: wrap; }
.footer-links a { color: var(--text-secondary); font-size: 13px; font-weight: 500; }
.footer-links a:hover { color: var(--text-primary); text-decoration: underline; }
.footer-copy { color: #888; font-size: 12px; }

@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero h1 { font-size: 40px; }
    .btn-group { flex-direction: column; padding: 0 20px; }
    .btn { width: 100%; }
    .guide-item { flex-direction: column; text-align: center; gap: 16px; padding: 24px; }
    .faq-q::before { content: '?'; font-family: inherit; font-weight: bold; }
}