:root {
    --primary: #0284c7;
    --primary-dark: #0369a1;
    --pro-color: #f59e0b;
    --pro-dark: #d97706;
    --dark: #0f172a;
    --light: #f8fafc;
    --border: #e2e8f0;
    --text-muted: #64748b;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #ffffff;
    color: var(--dark);
    line-height: 1.6;
}

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 20px;
}

/* --- HEADER NAVBAR --- */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
}

.brand {
    font-size: 22px;
    font-weight: 800;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.version-badge {
    font-size: 11px;
    background-color: #e0f2fe;
    color: var(--primary);
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 600;
}

.support-info {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-muted);
}

/* --- HERO SECTION --- */
.hero-section {
    padding: 60px 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

@media (max-width: 768px) {
    .hero-section {
        grid-template-columns: 1fr;
        text-align: center;
        padding: 40px 0;
    }
    .hero-left { order: 2; }
    .hero-right { order: 1; }
    .cta-buttons {
        justify-content: center;
        flex-direction: column;
    }
}

.hero-left h1 {
    font-size: 38px;
    font-weight: 900;
    line-height: 1.2;
    color: var(--dark);
    margin-bottom: 15px;
}

.hero-left h1 span {
    color: var(--primary);
}

.hero-left p {
    font-size: 16px;
    color: var(--text-muted);
    margin-bottom: 30px;
}

/* --- ĐỒNG BỘ NÚT BẤM THEO IMAGE_A4B46A.PNG --- */
.cta-buttons {
    display: flex;
    gap: 15px;
    align-items: stretch; /* Đảm bảo chiều cao 2 nút bằng nhau */
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 14px 24px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
    min-height: 54px; /* Fix cứng chiều cao đồng bộ */
    flex: 1; /* Chia đều độ rộng nếu trên màn hình máy tính */
    max-width: 280px;
}

@media (max-width: 992px) {
    .main-grid {
        grid-template-columns: 1fr;
    }
    .left-column .block-box:last-child {
        margin-bottom: 20px;
    }
    .badge-best-price {
        top: 12px;
        right: 15px;
        width: 65px;
        height: 65px;
    }
    .badge-text {
        font-size: 9px;
    }
}

@media (max-width: 576px) {
    body {
        padding: 10px;
    }

    .feature-layout {
        flex-direction: column;
        align-items: center;
    }

    .feature-img {
        width: 100%;
        height: auto;
        padding: 10px;
    }

    .footer-note {
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }
    
    .main-price-title {
        font-size: 28px;
    }
    
    .date-apply {
        font-size: 18px;
    }
}

.btn-download {
    background-color: var(--primary);
    color: white;
    box-shadow: 0 4px 14px rgba(2, 132, 199, 0.3);
}

.btn-download:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-pro {
    background-color: var(--pro-color);
    color: white;
    box-shadow: 0 4px 14px rgba(245, 158, 11, 0.3);
}

.btn-pro:hover {
    background-color: var(--pro-dark);
    transform: translateY(-2px);
}

.btn-block {
    max-width: 100%;
    width: 100%;
    display: flex;
}

/* --- KHUNG MOCKUP GIAO DIỆN PHẦN MỀM --- */
.software-mockup {
    background-color: #1e293b;
    border-radius: 12px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    border: 4px solid #334155;
    overflow: hidden;
}

.window-header {
    background-color: #334155;
    padding: 10px 15px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.circle {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    display: inline-block;
}
.c-red { background-color: #ef4444; }
.c-yellow { background-color: #eab308; }
.c-green { background-color: #22c55e; }

.window-title {
    color: #94a3b8;
    font-size: 12px;
    font-weight: 600;
    margin-left: 10px;
}

.window-body {
    background-color: #ffffff;
    padding: 20px;
    min-height: 230px;
}

.fake-tool-nav {
    display: flex;
    gap: 10px;
    background: #f1f5f9;
    padding: 8px;
    border-radius: 6px;
    margin-bottom: 15px;
    justify-content: space-between;
    align-items: center;
}

.fake-tabs {
    display: flex;
    gap: 10px;
}

.fake-tab {
    font-size: 11px;
    padding: 6px 12px;
    font-weight: 700;
    border-radius: 4px;
}

.active-tab {
    color: var(--primary);
    background: white;
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.inactive-tab {
    color: #94a3b8;
    background: #f8fafc;
}

.key-btn {
    font-size: 11px;
    background: var(--pro-color);
    color: white;
    padding: 4px 10px;
    border-radius: 4px;
    font-weight: 700;
}

.tool-status {
    font-size: 11px;
    margin-bottom: 10px;
    font-weight: 700;
    color: var(--primary);
}

.fake-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 11px;
    text-align: left;
}

.fake-table th {
    background: #f8fafc;
    padding: 8px;
    border-bottom: 2px solid var(--border);
    color: #475569;
}

.fake-table td {
    padding: 8px;
    border-bottom: 1px solid var(--border);
    color: #64748b;
}

/* --- BẢNG BÁO GIÁ --- */
.pricing-section {
    padding: 60px 0;
    background-color: var(--light);
    border-radius: 20px;
    margin: 40px auto;
}

.section-title {
    text-align: center;
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 10px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 15px;
    margin-bottom: 40px;
}

.price-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    align-items: stretch;
}

.price-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 40px 30px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
}

.price-card.pro-tier {
    border: 2px solid var(--pro-color);
    box-shadow: 0 10px 25px -5px rgba(245, 158, 11, 0.15);
}

.badge-pricing {
    position: absolute;
    top: -14px;
    right: 30px;
    background-color: var(--pro-color);
    color: white;
    padding: 4px 14px;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 700;
}

.price-header h3 {
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 5px;
}

.sub-price {
    color: var(--text-muted);
    font-size: 13px;
}

.cost {
    font-size: 36px;
    font-weight: 900;
    color: var(--dark);
    margin: 15px 0;
}

.cost span {
    font-size: 14px;
    color: var(--text-muted);
    font-weight: 400;
}

.pro-text {
    color: var(--pro-dark);
}

.feature-list {
    list-style: none;
    margin: 25px 0;
    border-top: 1px solid var(--border);
    padding-top: 20px;
}

.feature-list li {
    margin-bottom: 12px;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.feature-list li.disabled {
    color: #94a3b8;
    text-decoration: line-through;
}

.check-icon { color: #10b981; font-weight: bold; }
.cross-icon { color: #ef4444; font-weight: bold; }

/* --- QUY TRÌNH BA BƯỚC --- */
.steps-section {
    padding: 40px 0;
    text-align: center;
}

.steps-title {
    font-size: 20px;
    font-weight: 800;
    margin-top: 40px;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.step-box {
    padding: 20px;
    background: var(--light);
    border-radius: 12px;
    text-align: left;
    border-left: 4px solid var(--primary);
}

.step-num {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 5px;
}

.step-box h4 {
    font-weight: 700;
    margin-bottom: 5px;
}

.step-box p {
    font-size: 13px;
    color: var(--text-muted);
}

/* --- FOOTER --- */
footer {
    padding: 30px 0;
    text-align: center;
    font-size: 13px;
    opacity: 0.9;
    margin-top: 40px;
}
/* --- THANH ĐIỀU HƯỚNG --- */
.navigation-header {
    display: flex;
    align-items: center;
    gap: 8px;
    background: #ffffff;
    padding: 12px 20px;
    border-radius: 8px;
    border: 1px solid #e2e8f0;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
    margin-bottom: 5px;
}

.nav-home-link {
    font-size: 14.5px;
    font-weight: 600;
    color: #0056b3;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: color 0.2s ease, transform 0.2s ease;
}

.nav-home-link:hover {
    color: #0042cc;
    transform: translateY(-1px);
}

.nav-separator {
    color: #94a3b8;
    font-size: 14px;
    user-select: none;
}

.nav-current {
    font-size: 14.5px;
    color: #64748b;
    font-weight: 500;
}

@media (max-width: 576px) {
    .navigation-header {
        padding: 10px 15px;
        font-size: 13.5px;
    }
}