:root { --p-blue: #007fff; --p-navy: #003366; --p-gray: #f4f7f6; --p-green: #28a745; }
body { font-family: 'Segoe UI', Roboto, sans-serif; margin: 0; color: #333; line-height: 1.6; scroll-behavior: smooth; }

header { background: #fff; padding: 20px 0; border-bottom: 1px solid #eee; }
.header-container { display: flex; justify-content: space-between; align-items: center; }
.logo-v3 { font-size: 24px; font-weight: bold; color: var(--p-blue); text-decoration: none; }
.nav-v3 a { margin-left: 20px; text-decoration: none; color: #666; font-weight: 500; }

.hero-v3 { 
    background: linear-gradient(rgba(0,51,102,0.8), rgba(0,51,102,0.9)), url('assets/hero-bg.jpg'); 
    background-size: cover;
    background-position: center;
    color: #fff; 
    padding: 120px 20px; 
    text-align: center; 
}
.hero-v3 h1 { font-size: 3.5rem; margin-bottom: 25px; letter-spacing: -1px; }
.hero-v3 p { font-size: 1.4rem; opacity: 0.8; max-width: 800px; margin: 0 auto 40px; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

.efficiency-data { display: flex; justify-content: space-around; margin-top: -60px; }
.data-card { background: #fff; padding: 40px; border-radius: 12px; box-shadow: 0 15px 35px rgba(0,0,0,0.1); text-align: center; width: 30%; }
.data-card h3 { font-size: 2.5rem; color: var(--p-blue); margin: 0; }
.data-card p { font-size: 1.1rem; color: #666; }

/* CSS Chart Section */
.chart-section { padding: 100px 0; background: #fff; }
.chart-container { display: flex; align-items: flex-end; justify-content: space-around; height: 300px; border-bottom: 2px solid #eee; padding-bottom: 20px; margin-top: 50px; }
.bar-group { display: flex; flex-direction: column; align-items: center; width: 20%; }
.bar { width: 40px; border-radius: 5px 5px 0 0; transition: height 1s ease; position: relative; }
.bar-old { background: #ccc; height: 100px; }
.bar-new { background: var(--p-blue); height: 250px; }
.bar::after { content: attr(data-value); position: absolute; top: -30px; left: 50%; transform: translateX(-50%); font-weight: bold; color: var(--p-blue); }
.bar-old::after { color: #999; }
.bar-label { margin-top: 15px; font-size: 0.9rem; font-weight: bold; }

.timeline-section { padding: 100px 0; background: var(--p-gray); }
.section-header { text-align: center; margin-bottom: 60px; }
.section-header h2 { font-size: 2.5rem; }

.timeline { position: relative; max-width: 800px; margin: 0 auto; }
.timeline-item { padding: 20px 40px; position: relative; background: #fff; border-radius: 8px; margin-bottom: 30px; box-shadow: 0 5px 15px rgba(0,0,0,0.05); }
.timeline-item::before { content: ''; position: absolute; left: -20px; top: 50%; transform: translateY(-50%); width: 12px; height: 12px; background: var(--p-blue); border-radius: 50%; }
.time { font-weight: bold; color: var(--p-blue); margin-bottom: 5px; display: block; }

.cta-v3 { background: var(--p-blue); color: #fff; padding: 80px 0; text-align: center; }
.btn-v3 { display: inline-block; padding: 18px 50px; background: #fff; color: var(--p-blue); text-decoration: none; border-radius: 50px; font-weight: bold; font-size: 1.2rem; transition: transform 0.2s; }
.btn-v3:hover { transform: scale(1.05); }

footer { text-align: center; padding: 40px; font-size: 0.9rem; color: #999; }

/* 404 & Download */
.status-v3 { padding: 100px 0; text-align: center; }
.status-v3 h1 { font-size: 80px; color: var(--p-blue); }

.dl-grid-v3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; margin-top: 40px; }
.dl-card-v3 { background: #f9f9f9; padding: 30px; border-radius: 10px; text-align: center; }

@media (max-width: 768px) { .efficiency-data { flex-direction: column; align-items: center; gap: 20px; } .data-card { width: 90%; } .chart-container { height: 200px; } .bar { width: 25px; } .hero-v3 h1 { font-size: 2.5rem; } }