/* ========================================================================== */
/* STYLING CHO PHÂN HỆ GIỚI THIỆU, HƯỚNG DẪN & BẢNG GIÁ (ABOUT.CSS)          */
/* ========================================================================== */

.about-container {
    max-width: 960px;
    margin: 0 auto;
    padding: 20px 10px 50px 10px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* Hero Section */
.about-hero {
    background: linear-gradient(135deg, #0071e3 0%, #42a5f5 100%);
    color: white;
    border-radius: 20px;
    padding: 36px 30px;
    text-align: center;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 113, 227, 0.2);
}

.hero-badge {
    background: rgba(255, 255, 255, 0.2);
    display: inline-block;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 14px;
}

.about-hero h2 {
    font-size: 26px;
    font-weight: 800;
    margin: 0 0 12px 0;
}

.hero-desc {
    font-size: 14px;
    line-height: 1.6;
    max-width: 750px;
    margin: 0 auto;
    opacity: 0.95;
}

/* Author Section */
.author-section {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: 18px;
    padding: 28px;
    margin-bottom: 35px;
    display: flex;
    align-items: center;
    gap: 25px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.03);
}

.author-avatar {
    width: 75px;
    height: 75px;
    background: linear-gradient(135deg, #34c759, #30b0c7);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 32px;
    flex-shrink: 0;
    box-shadow: 0 6px 15px rgba(52, 199, 89, 0.3);
}

.author-info h3 {
    margin: 0 0 4px 0;
    font-size: 14px;
    color: #86868b;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 700;
}

.author-name {
    font-size: 20px;
    font-weight: 800;
    color: #1d1d1f;
    margin: 0 0 14px 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(180px, 1fr));
    gap: 10px 20px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: #1d1d1f;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.contact-item:hover {
    color: #0071e3;
}

.contact-item i {
    font-size: 15px;
    color: #0071e3;
}

/* Manual Section & Tabs */
.manual-section {
    background: #ffffff;
    border: 1px solid #e5e5ea;
    border-radius: 18px;
    padding: 30px;
    margin-bottom: 35px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
}

.section-header {
    text-align: center;
    margin-bottom: 25px;
}

.section-header h3 {
    font-size: 20px;
    font-weight: 700;
    color: #1d1d1f;
    margin: 0 0 6px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.section-header p {
    font-size: 13px;
    color: #86868b;
    margin: 0;
}

.manual-tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 25px;
    flex-wrap: wrap;
    border-bottom: 1px solid #f2f2f7;
    padding-bottom: 15px;
}

.tab-btn {
    background: #f5f5f7;
    color: #1d1d1f;
    border: none;
    padding: 10px 18px;
    border-radius: 12px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.tab-btn:hover {
    background: #e5e5ea;
}

.tab-btn.active {
    background: #0071e3;
    color: white;
    box-shadow: 0 4px 12px rgba(0, 113, 227, 0.3);
}

.manual-pane {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.manual-pane.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.pane-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 30px;
    align-items: center;
}

.pane-text h4 {
    font-size: 17px;
    font-weight: 700;
    color: #1d1d1f;
    margin: 0 0 10px 0;
}

.pane-text p {
    font-size: 13px;
    color: #48484a;
    line-height: 1.6;
    margin: 0 0 14px 0;
}

.pane-text ul {
    margin: 0;
    padding-left: 18px;
    font-size: 13px;
    color: #48484a;
    line-height: 1.6;
}

.pane-text li {
    margin-bottom: 6px;
}

.mockup-box {
    background: #f9f9fb;
    border: 2px dashed #d2d2d7;
    border-radius: 14px;
    padding: 30px 20px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #86868b;
    font-size: 13px;
    font-weight: 500;
}

/* Pricing Grid */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.pricing-card {
    background: #ffffff;
    border: 1px solid #e5e5ea;
    border-radius: 16px;
    padding: 24px;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
    position: relative;
    transition: transform 0.2s;
}

.pricing-card:hover {
    transform: translateY(-4px);
}

.pricing-card.popular {
    border: 2px solid #0071e3;
    box-shadow: 0 10px 30px rgba(0, 113, 227, 0.1);
}

.popular-badge {
    position: absolute;
    top: -12px;
    right: 20px;
    background: #0071e3;
    color: white;
    font-size: 10px;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.pricing-title {
    font-size: 15px;
    font-weight: 700;
    color: #1d1d1f;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.pricing-price {
    margin-bottom: 16px;
}

.price-num {
    font-size: 26px;
    font-weight: 800;
    color: #0071e3;
}

.price-sub {
    font-size: 12px;
    color: #86868b;
}

.price-tag {
    font-size: 11px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 20px;
    display: inline-block;
    margin-bottom: 20px;
}

.price-tag.free {
    background: #f5f5f7;
    color: #34c759;
}

.price-tag.pro {
    background: #e8f2fc;
    color: #0071e3;
}

.pricing-features {
    border-top: 1px solid #f2f2f7;
    padding-top: 16px;
    text-align: left;
}

.features-label {
    font-size: 12px;
    font-weight: 600;
    color: #1d1d1f;
    margin-bottom: 12px;
}

.features-list {
    list-style: none;
    padding: 0;
    margin: 0;
    font-size: 12px;
    color: #555;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.features-list li {
    display: flex;
    align-items: center;
    gap: 6px;
}

.pricing-btn {
    margin-top: 24px;
    border: none;
    padding: 10px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 13px;
    cursor: pointer;
    transition: 0.2s;
    width: 100%;
}

.pricing-btn.secondary {
    background: #e8f2fc;
    color: #0071e3;
}

.pricing-btn.secondary:hover {
    background: #d0e4fc;
}

.pricing-btn.primary {
    background: #0071e3;
    color: white;
}

.pricing-btn.primary:hover {
    background: #0062c4;
}

/* Responsive Media Query */
@media (max-width: 768px) {
    .pricing-grid {
        grid-template-columns: 1fr !important;
        gap: 15px !important;
    }
    .author-section {
        flex-direction: column;
        text-align: center;
    }
    .contact-grid {
        grid-template-columns: 1fr;
        justify-items: center;
    }
    .pane-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}
@media (max-width: 900px) {
    .about-top-split-grid {
        grid-template-columns: 1fr !important;
    }
}