/* --- PHÔNG CHỮ & BIẾN --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;700;900&family=Oswald:wght@500;700&display=swap');

:root {
    --primary-gold: #fbbf24;
    --secondary-blue: #0056b3;
    --bg-dark: #000000;
    --bg-deep-blue: #0f172a;
}

/* --- CÀI ĐẶT CƠ BẢN --- */
body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    margin: 0;
    padding: 0;
    overflow-x: hidden;
    color: #fff;
    padding-top: 45px;
    scroll-behavior: smooth;
}

/* --- HEADER CỐ ĐỊNH --- */
.sp-sticky-header {
    position: fixed; top: 0; left: 0; width: 100%; height: 45px;
    background-color: rgba(0,0,0,0.95); display: flex; align-items: center; justify-content: space-between;
    z-index: 99999; border-bottom: 1px solid #333; backdrop-filter: blur(10px);
}
.left-group, .right-group { display: flex; align-items: center; height: 100%; }

.sp-back-to-home {
    display: flex; align-items: center; justify-content: center; width: 45px; height: 45px;
    background-color: #007f74; color: white; text-decoration: none; font-size: 18px;
    transition: all 0.3s ease;
}
.sp-back-to-home:hover { background-color: #00a89a; }

.sp-mag-logo { margin-left: 15px; } 
.sp-mag-logo img { height: 22px; width: auto; filter: brightness(0) invert(1); }

.center-logo img { height: 24px; width: auto; opacity: 0.8; } 
.right-group { padding-right: 15px; }

.fb-custom-btn {
    display: flex; align-items: center; gap: 6px; color: #ccc;
    text-decoration: none; font-size: 12px; font-weight: bold; 
    padding: 5px 12px; border: 1px solid #444; border-radius: 4px; transition: all 0.2s;
}
.fb-custom-btn:hover { color: #fff; border-color: #666; background: rgba(255,255,255,0.1); }

/* --- HIỆU ỨNG TRÌNH DIỄN CUỘN (SCROLLYTELLING) --- */
.scrolly-container { display: flex; flex-direction: column; width: 100%; }

.step {
    height: 100vh; width: 100%;
    position: relative;
    display: flex; align-items: flex-end; 
    justify-content: center;
    overflow: hidden;
    background-size: cover; 
    background-position: center center;
    background-attachment: fixed;
    background-repeat: no-repeat;
    background-color: #111; 
}

.step::after {
    content: ''; position: absolute; bottom: 0; left: 0;
    width: 100%; height: 70%; 
    background: linear-gradient(to top, rgba(0,0,0,1) 0%, rgba(0,0,0,0.7) 50%, transparent 100%);
    z-index: 1; pointer-events: none;
}

.step-content {
    position: relative; z-index: 10;
    max-width: 1000px; width: 100%;
    padding: 0 2rem 4rem 2rem; 
    text-align: left;
    opacity: 0; 
    transform: translateY(20px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.step h2 {
    font-size: clamp(2rem, 5vw, 4rem); font-weight: 900; line-height: 1.1; margin-bottom: 2rem;
    color: #fff; text-transform: uppercase; letter-spacing: -2px;
    text-shadow: 0 4px 20px rgba(0,0,0,0.8);
}

.text-center { text-align: center; }
.gold-text { color: var(--primary-gold); }
.title-divider { width: 100px; height: 4px; background: var(--primary-gold); margin: 30px auto; }

.step p {
    font-size: 1.25rem; line-height: 1.7; color: rgba(255,255,255,0.95); margin-bottom: 1.5rem;
    max-width: 800px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.8);
}

.step p strong {
    display: block; font-size: 1rem; font-weight: 800;
    color: var(--primary-gold); margin-bottom: 0.5rem;
    text-transform: uppercase; letter-spacing: 1px;
}

.text-highlight { display: block; }

/* --- PHẦN THÔNG SỐ (INFOGRAPHIC) --- */
.info-section {
    background: var(--bg-deep-blue);
    padding: 100px 20px; border-top: 1px solid #1e293b;
}
.info-container { max-width: 1300px; margin: 0 auto; }

.info-title {
    text-align: center; color: #fff;
    font-family: 'Oswald', sans-serif; font-size: 3rem; font-weight: 700;
    margin-bottom: 60px; text-transform: uppercase;
    background: linear-gradient(to bottom, #fff 0%, #94a3b8 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}

.project-block { margin-bottom: 80px; }

.project-header {
    display: flex; align-items: center; gap: 20px; margin-bottom: 40px;
    border-bottom: 2px solid var(--primary-gold); padding-bottom: 15px;
}
.project-header i { font-size: 2.5rem; color: var(--primary-gold); }
.project-header h4 { font-family: 'Oswald', sans-serif; font-size: 2rem; text-transform: uppercase; letter-spacing: 1px; margin: 0; }

.stats-grid { 
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); 
    gap: 25px; 
}

.stat-card {
    background: rgba(255, 255, 255, 0.05); 
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px; padding: 30px;
    transition: all 0.3s ease;
    display: flex; flex-direction: column; justify-content: center;
}
.stat-card:hover { 
    background: rgba(255, 255, 255, 0.1); 
    border-color: var(--primary-gold);
    transform: translateY(-5px);
}

.stat-icon { font-size: 1.5rem; color: var(--primary-gold); margin-bottom: 15px; opacity: 0.9; }
.stat-label { font-size: 0.8rem; color: #cbd5e1; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 8px; font-weight: 600; }
.stat-value { font-family: 'Oswald', sans-serif; font-size: 2.2rem; line-height: 1; font-weight: 700; color: #fff; }
.stat-value-sm { font-family: 'Oswald', sans-serif; font-size: 1.2rem; font-weight: 700; color: #fff; }
.stat-unit { font-size: 1.1rem; color: var(--primary-gold); margin-left: 5px; text-transform: none; font-family: 'Inter', sans-serif; }
.stat-desc { font-size: 0.9rem; color: #94a3b8; margin-top: 10px; line-height: 1.4; }

/* --- CHÂN TRANG --- */
.footer-box { background-color: #020617; padding: 60px 20px; text-align: center; border-top: 1px solid #1e293b; }
.footer-info { display: flex; flex-direction: column; gap: 10px; align-items: center; }
.footer-info p { margin: 0; font-size: 0.85rem; color: #64748b; }
.footer-info strong { color: #94a3b8; }

/* --- HÌNH NỀN SECTION --- */
#step-1 { background-image: url('https://sohanews.sohacdn.com/160588918557773824/2026/1/26/sun1-1769400678501471312007.png'); align-items: center; }
#step-2 { background-image: url('https://sohanews.sohacdn.com/160588918557773824/2026/1/26/sun2-1769419947862376054769.png'); }
#step-3 { background-image: url('https://sohanews.sohacdn.com/160588918557773824/2026/1/26/sun4-17694184266291865008742.png'); }
#step-4 { background-image: url('https://sohanews.sohacdn.com/160588918557773824/2026/1/22/ai-4-17690745222071102478602.png'); }
#step-5 { background-image: url('https://sohanews.sohacdn.com/160588918557773824/2026/1/22/ai-1-17690738801101835431164.png'); }
#step-6 { background-image: url('https://sohanews.sohacdn.com/160588918557773824/2026/1/22/ai-2-17690738801241774373984.png'); }
#step-7 { background-image: url('https://sohanews.sohacdn.com/160588918557773824/2026/1/26/geminigeneratedimageg246y4g246y4g246-17694145275651500398674.png'); }
#step-9 { background-image: url('https://sohanews.sohacdn.com/160588918557773824/2026/1/26/sun7-1769420566028355559909.png'); }
#step-8 { background-image: url('https://sohanews.sohacdn.com/160588918557773824/2026/1/22/ai-3-1769074053902114078120.png'); }
#step-10 { background-image: url('https://sohanews.sohacdn.com/160588918557773824/2026/1/26/sun1-1769400678501471312007.png'); }

/* --- THIẾT KẾ ĐÁP ỨNG --- */
@media (max-width: 768px) {
    .info-title { font-size: 2rem; }
    .project-header h4 { font-size: 1.5rem; }
    .stat-value { font-size: 1.8rem; }
    .step { background-attachment: scroll; }
    .step-content { padding-bottom: 6rem; } 
}