:root {
            --primary-color: #0088CC;
            --primary-dark: #00619A;
            --secondary-color: #4B5563;
            --accent-color: #FF7A00;
            --accent-soft: rgba(255, 122, 0, 0.12);
            --success: #22C55E;
            --danger: #EF4444;
            --background-light: #F3F4F8;
            --background-card: #FFFFFF;
            --background-dark: #111827;
            --text-dark: #111827;
            --text-light: #FFFFFF;
            --text-muted: #6B7280;
            --border-soft: #E5E7EB;
            --shadow-soft: 0 10px 30px rgba(15, 23, 42, 0.08);
            --radius-lg: 18px;
            --radius-xl: 24px;
            --header-height: 70px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Montserrat', sans-serif;
        }

        html { scroll-padding-top: var(--header-height); }
        body {
            line-height: 1.6;
            color: var(--text-dark);
            background-color: var(--background-light);
        }

        img { max-width: 100%; display: block; }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 16px;
        }

        a { text-decoration: none; color: var(--primary-color); }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 999px;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.25s ease;
            border: none;
            text-align: center;
            box-shadow: 0 4px 10px rgba(15, 23, 42, 0.18);
            font-size: 14px;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
            color: var(--text-light);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 24px rgba(15, 23, 42, 0.25);
        }
        .btn-outline {
            background: rgba(255, 255, 255, 0.1);
            color: #F9FAFB;
            border: 1px solid rgba(249, 250, 251, 0.4);
            box-shadow: none;
        }
        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.2);
            transform: translateY(-2px);
        }

        .section-padding { padding: 80px 0; }
        .text-center { text-align: center; }

        .section-title {
            font-size: 30px;
            font-weight: 800;
            margin-bottom: 10px;
        }
        .section-subtitle {
            color: var(--text-muted);
            font-size: 14px;
        }
        .highlight { color: var(--primary-color); }
        .highlight-accent { color: var(--accent-color); }

        /* HEADER */
        header {
            background-color: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            position: sticky;
            top: 0;
            z-index: 1000;
            height: var(--header-height);
            box-shadow: 0 2px 12px rgba(15, 23, 42, 0.04);
            .logo-img {
    height: 32px;   /* muốn nhỏ hơn thì chỉnh 32, lớn hơn thì 48 */
    width: auto;
    display: block;
}
        }
        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 100%;
        }
        .logo {
            font-size: 22px;
            font-weight: 900;
            color: var(--primary-color);
            display: inline-flex;
            align-items: center;
            gap: 8px;
            letter-spacing: 0.04em;
            text-transform: uppercase;
        }
        

        .logo span { color: var(--text-dark); }
        .logo i { font-size: 22px; }

        .nav-links {
            display: flex;
            list-style: none;
            gap: 22px;
        }
        .nav-links a {
            color: var(--text-dark);
            font-weight: 600;
            font-size: 14px;
            position: relative;
            padding: 4px 0;
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
            transition: width 0.25s;
        }
        .nav-links a:hover::after,
        .nav-links a.active::after {
            width: 100%;
        }

        .cta-header { font-size: 13px; padding-inline: 18px; }

        .menu-toggle {
            display: none;
            flex-direction: column;
            cursor: pointer;
            gap: 5px;
        }
        .bar {
            width: 24px;
            height: 3px;
            background-color: var(--text-dark);
            border-radius: 999px;
            transition: 0.3s;
        }

        /* HERO */
        .hero-section {
            position: relative;
            padding: 110px 0 90px;
            color: var(--text-light);
            background:
                radial-gradient(circle at top left, rgba(0, 136, 204, 0.45), transparent 50%),
                radial-gradient(circle at bottom right, rgba(255, 122, 0, 0.55), transparent 55%),
                linear-gradient(135deg, #020617 0%, #020817 40%, #020617 100%);
            overflow: hidden;
        }
        .hero-inner {
            display: grid;
            grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
            gap: 40px;
            align-items: center;
        }
        .hero-text h1 {
            font-size: 40px;
            line-height: 1.15;
            font-weight: 900;
            text-transform: uppercase;
            margin-bottom: 14px;
        }
        .hero-text h1 span { color: var(--accent-color); }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 5px 14px;
            border-radius: 999px;
            background: rgba(15, 118, 110, 0.12);
            border: 1px solid rgba(148, 163, 184, 0.4);
            color: #E5E7EB;
            font-size: 11px;
            text-transform: uppercase;
            letter-spacing: 0.12em;
            margin-bottom: 10px;
        }
        .hero-text p {
            font-size: 16px;
            max-width: 520px;
            color: #E5E7EB;
            margin-bottom: 22px;
        }
        .hero-btns {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            margin-bottom: 18px;
        }
        .hero-note {
            font-size: 12px;
            color: #CBD5F5;
            opacity: 0.85;
        }

        .hero-card {
            background: rgba(15, 23, 42, 0.83);
            border-radius: var(--radius-xl);
            padding: 24px 22px;
            box-shadow: 0 20px 40px rgba(15, 23, 42, 0.6);
            border: 1px solid rgba(148, 163, 184, 0.35);
        }
        .hero-card-title {
            font-size: 14px;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .hero-card-sub {
            font-size: 12px;
            color: #D1D5DB;
            margin-bottom: 14px;
        }
        .hero-card-stats {
            display: grid;
            grid-template-columns: repeat(2, minmax(0, 1fr));
            gap: 14px;
            margin-bottom: 14px;
        }
        .hero-card-stat {
            background: rgba(15,23,42,0.9);
            border-radius: 14px;
            padding: 10px 12px;
            border: 1px solid rgba(55,65,81,0.7);
        }
        .hero-card-stat span:first-child {
            font-size: 11px;
            color: #9CA3AF;
        }
        .hero-card-stat span:last-child {
            display: block;
            font-size: 15px;
            font-weight: 800;
            margin-top: 2px;
        }
        .hero-card-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 11px;
            color: #9CA3AF;
        }
        .hero-card-label i { color: var(--accent-color); }

        /* STATS */
        .stats-section { margin-top: -30px; position: relative; z-index: 10; }
        .stats-bar {
            background: var(--background-card);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-soft);
            padding: 22px 18px;
            display: flex;
            justify-content: space-around;
            flex-wrap: wrap;
            gap: 20px;
            max-width: 1000px;
            margin: 0 auto;
        }
        .stat-item { text-align: center; min-width: 120px; }
        .stat-item .number {
            font-size: 28px;
            font-weight: 900;
            background: linear-gradient(120deg, var(--primary-color), var(--accent-color));
            -webkit-background-clip: text;
            color: transparent;
        }
        .stat-item div:last-child {
            font-size: 12px;
            font-weight: 600;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 0.08em;
        }

        /* ABOUT */
        .about-grid {
            display: grid;
            grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
            gap: 46px;
            align-items: center;
        }
        .about-content h4 {
            color: var(--primary-color);
            font-weight: 700;
            text-transform: uppercase;
            font-size: 13px;
            letter-spacing: 0.18em;
            margin-bottom: 8px;
        }
        .about-content h2 {
            font-size: 30px;
            font-weight: 900;
            margin-bottom: 18px;
        }
        .about-content p {
            color: var(--text-muted);
            font-size: 14px;
            margin-bottom: 16px;
        }
        .about-content ul { list-style: none; margin-top: 10px; }
        .about-content ul li {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 10px;
            font-size: 14px;
            font-weight: 600;
            color: #374151;
        }
        .about-content ul i { color: var(--success); }
        .about-badge-row {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin: 16px 0 4px;
        }
        .about-badge {
            padding: 6px 12px;
            font-size: 11px;
            border-radius: 999px;
            background: #E5F3FF;
            color: #1D4ED8;
            border: 1px solid #BFDBFE;
        }
        .about-image-wrapper { position: relative; }
        
        .about-tag {
            position: absolute;
            bottom: 12px;
            left: 12px;
            background: rgba(15,23,42,0.90);
            color: #F9FAFB;
            padding: 10px 14px;
            border-radius: 14px;
            font-size: 11px;
            display: inline-flex;
            flex-direction: column;
            gap: 2px;
        }
        .about-tag span:first-child { opacity: 0.8; }
        .about-tag span:last-child { font-weight: 700; }

        /* FEATURES */
        .features-section {
            background: radial-gradient(circle at top, rgba(0, 136, 204, 0.06), transparent 60%), var(--background-light);
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 24px;
            margin-top: 34px;
        }
        .feature-card {
            background: var(--background-card);
            border-radius: var(--radius-lg);
            padding: 22px 18px;
            border: 1px solid var(--border-soft);
            box-shadow: 0 8px 18px rgba(15, 23, 42, 0.04);
            transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
        }
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 16px 32px rgba(15, 23, 42, 0.12);
            border-color: rgba(0, 136, 204, 0.55);
        }
        .feature-icon {
            width: 42px;
            height: 42px;
            border-radius: 14px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--accent-soft);
            color: var(--accent-color);
            margin-bottom: 10px;
            font-size: 20px;
        }
        .feature-card h3 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .feature-card p {
            font-size: 14px;
            color: var(--text-muted);
        }

        /* PROCESS */
        .process-section { background: #FFFFFF; }
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, minmax(0, 1fr));
            gap: 20px;
            margin-top: 40px;
        }
        .process-step {
            text-align: center;
            position: relative;
            padding: 18px 10px 8px;
        }
        .step-icon {
            width: 72px;
            height: 72px;
            border-radius: 999px;
            background: #0F172A;
            color: #F9FAFB;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 12px;
            font-size: 22px;
            font-weight: 800;
            border: 3px solid #E5E7EB;
            transition: 0.3s;
        }
        .process-step:hover .step-icon {
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            transform: translateY(-2px) scale(1.03);
            border-color: rgba(249, 250, 251, 0.9);
        }
        .process-step h3 {
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 4px;
        }
        .process-step p {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* PROJECTS */
        .project-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 26px;
            margin-top: 34px;
        }
        .project-card {
            background: var(--background-card);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: 0 8px 18px rgba(15, 23, 42, 0.05);
            border: 1px solid var(--border-soft);
            transition: transform 0.22s ease, box-shadow 0.22s ease;
        }
        .project-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 18px 36px rgba(15, 23, 42, 0.16);
        }
        .project-image { position: relative; overflow: hidden; max-height: 210px; }
        .project-image img {
            width: 100%;
            height: 210px;
            object-fit: cover;
            transition: transform 0.25s ease;
        }
        .project-card:hover .project-image img { transform: scale(1.05); }
        .tag-status {
            position: absolute;
            top: 12px;
            right: 12px;
            padding: 4px 10px;
            background: rgba(22, 163, 74, 0.92);
            color: #ECFDF5;
            border-radius: 999px;
            font-size: 11px;
            font-weight: 700;
        }
        .project-info {
            padding: 16px 16px 14px;
        }
        .project-info h4 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 4px;
        }
        .project-info p {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 12px;
        }
        .project-specs {
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-top: 1px solid var(--border-soft);
            padding-top: 10px;
            font-size: 12px;
            color: #6B7280;
            font-weight: 600;
        }
        .project-specs i { margin-right: 4px; }

        /* TABLE */
        .comparison-wrap { margin-top: 30px; }
        .table-responsive {
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            border-radius: var(--radius-lg);
            box-shadow: 0 8px 22px rgba(15, 23, 42, 0.06);
        }
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            min-width: 650px;
            background: #FFFFFF;
        }
        .comparison-table th,
        .comparison-table td {
            padding: 14px 16px;
            text-align: center;
            border-bottom: 1px solid #E5E7EB;
            font-size: 13px;
        }
        .comparison-table th {
            background: #020617;
            color: #E5E7EB;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.06em;
        }
        .comparison-table th:first-child { text-align: left; }
        .comparison-table td:first-child {
            text-align: left;
            font-weight: 600;
            color: #111827;
        }
        .comparison-table .col-hybrid {
            background: rgba(0, 136, 204, 0.06);
            border-left: 2px solid var(--primary-color);
            border-right: 2px solid var(--primary-color);
            font-weight: 600;
        }
        .comparison-table th.col-hybrid {
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            color: #F9FAFB;
            border: none;
        }
        .comparison-table i.fa-check { color: var(--success); }
        .comparison-table i.fa-xmark { color: var(--danger); }

        /* CALCULATOR */
        .calc-section {
            background: radial-gradient(circle at top, rgba(0, 136, 204, 0.18), transparent 55%), #020617;
            color: #F9FAFB;
        }
        .calc-wrapper {
            max-width: 600px;
            margin: 0 auto;
            background: rgba(15,23,42,0.9);
            padding: 26px 22px;
            border-radius: var(--radius-xl);
            border: 1px solid rgba(148, 163, 184, 0.5);
            box-shadow: 0 18px 38px rgba(15, 23, 42, 0.85);
        }
        .form-group { margin-bottom: 16px; }
        .form-group label {
            display: block;
            margin-bottom: 6px;
            font-weight: 600;
            font-size: 13px;
        }
        .form-control {
            width: 100%;
            padding: 10px 12px;
            border-radius: 10px;
            border: 1px solid rgba(148, 163, 184, 0.8);
            font-size: 14px;
            background: rgba(15, 23, 42, 0.9);
            color: #E5E7EB;
            outline: none;
            transition: border-color 0.2s ease, box-shadow 0.2s ease;
        }
        .form-control::placeholder { color: #6B7280; }
        .form-control:focus {
            border-color: var(--accent-color);
            box-shadow: 0 0 0 1px rgba(251, 191, 36, 0.4);
        }

        .result-box {
            margin-top: 18px;
            padding: 18px 16px;
            background: rgba(22, 163, 74, 0.08);
            border-radius: 14px;
            border: 1px solid rgba(34, 197, 94, 0.6);
            display: none;
            animation: fadeIn 0.45s ease;
            font-size: 13px;
        }
        .result-main {
            font-size: 18px;
            font-weight: 800;
            color: #BBF7D0;
            margin-bottom: 4px;
        }
        .result-sub { margin-bottom: 6px; }
        .result-price {
            font-size: 18px;
            font-weight: 900;
            margin-top: 8px;
        }
        .result-payback {
            font-size: 12px;
            color: #D1FAE5;
            margin-top: 2px;
        }

        /* CONTACT */
        .contact-grid {
            display: grid;
            grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
            gap: 32px;
        }
        .contact-form {
            background: var(--background-card);
            padding: 26px 22px;
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-soft);
            border: 1px solid var(--border-soft);
        }
        .contact-form h2 {
            font-weight: 800;
            margin-bottom: 8px;
            font-size: 22px;
        }
        .contact-form p {
            color: var(--text-muted);
            margin-bottom: 18px;
            font-size: 13px;
        }
        .contact-form .form-control {
            background: #F9FAFB;
            border-color: #D1D5DB;
            color: #111827;
        }
        .contact-form .form-control:focus { background: #FFFFFF; }
        .contact-status {
            margin-top: 10px;
            font-size: 13px;
            display: none;
        }
        .contact-status.success { color: #16A34A; }
        .contact-status.error { color: #DC2626; }

        .contact-info h3 {
            font-weight: 800;
            margin-bottom: 16px;
            font-size: 18px;
        }
        .info-item {
            display: flex;
            gap: 14px;
            margin-bottom: 18px;
            font-size: 14px;
        }
        .info-item i {
            width: 40px;
            height: 40px;
            border-radius: 999px;
            background: rgba(0, 136, 204, 0.12);
            color: var(--primary-color);
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .info-item strong { display: block; margin-bottom: 2px; }
        .map-frame {
            margin-top: 12px;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid #E5E7EB;
            box-shadow: 0 10px 24px rgba(15, 23, 42, 0.10);
            height: 260px;
        }

        /* FOOTER */
        footer {
            background: #020617;
            color: #9CA3AF;
            padding: 34px 0 20px;
            font-size: 13px;
        }
        footer h4 {
            color: #F9FAFB;
            margin-bottom: 14px;
            font-size: 15px;
        }
        footer ul { list-style: none; }
        footer ul li { margin-bottom: 8px; }
        footer ul li a {
            color: #9CA3AF;
            transition: 0.2s;
        }
        footer ul li a:hover {
            color: var(--accent-color);
            padding-left: 3px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
            gap: 24px;
            margin-bottom: 22px;
        }
        .footer-bottom {
            border-top: 1px solid #111827;
            padding-top: 14px;
            text-align: center;
            font-size: 12px;
            color: #6B7280;
        }

        /* FLOATING CTA */
        .mobile-cta-bar {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 999;
            background: #FFFFFF;
            box-shadow: 0 -2px 10px rgba(15, 23, 42, 0.16);
        }
        .mobile-cta-btn {
            flex: 1;
            padding: 10px;
            text-align: center;
            font-weight: 700;
            color: #FFFFFF;
            font-size: 13px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
        }
        .bg-call { background: #16A34A; }
        .bg-zalo { background: #0068ff; }

        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 42px;
            height: 42px;
            border-radius: 999px;
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            color: #FFFFFF;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: 0.25s;
            z-index: 990;
            box-shadow: 0 10px 24px rgba(15, 23, 42, 0.5);
        }
        .back-to-top.show {
            opacity: 1;
            visibility: visible;
        }

        /* RESPONSIVE */
        @media (max-width: 992px) {
            .menu-toggle { display: flex; }
            .nav-links {
                position: fixed;
                top: var(--header-height);
                right: -100%;
                width: 80%;
                height: calc(100vh - var(--header-height));
                background: #FFFFFF;
                flex-direction: column;
                padding: 24px 18px;
                box-shadow: -4px 0 16px rgba(15, 23, 42, 0.18);
                transition: 0.28s ease-in-out;
                align-items: flex-start;
            }
            .nav-links.active { right: 0; }
            .cta-header { display: none; }
            .hero-inner { grid-template-columns: minmax(0, 1fr); }
            .hero-text h1 { font-size: 32px; }
            .about-grid, .contact-grid { grid-template-columns: 1fr; }
            .about-image-wrapper { order: -1; }
            .process-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
            body { padding-bottom: 52px; }
            .mobile-cta-bar { display: flex; }
            .back-to-top { bottom: 70px; right: 18px; }
        }
        @media (max-width: 576px) {
            .hero-btns { flex-direction: column; }
            .btn { width: 100%; }
            .stats-bar { padding-inline: 12px; }
            .process-grid { grid-template-columns: 1fr; }
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(8px); }
            to { opacity: 1; transform: translateY(0); }
        }

/* ==== VIDEO BLOCK PHAN "VE PHL SOLAR" ==== */
.about-image-main {
    border-radius: 24px;
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    border: 1px solid rgba(15,23,42,0.08);
}

.about-image-main.about-video {
    aspect-ratio: 16/9;
    background: #000;
}

.about-image-main.about-video video {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}