:root {
    --primary: #1abc9c;
    --primary-dark: #16a085;
    --primary-light: rgba(26, 188, 156, 0.05);
    --text-main: #1e293b;
    --text-muted: #64748b;
    --white: #ffffff;
    --shadow-soft: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-hover: 0 8px 24px rgba(26, 188, 156, 0.12);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-main);
    background-color: #f8fafc;
}

.how-to-use-hero {
    padding: 180px 0 60px;
    text-align: center;
    position: relative;
    background: linear-gradient(180deg, var(--primary-light) 0%, transparent 100%);
}

.section-heading {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
    color: var(--text-main);
    line-height: 1.1;
}

.subheading {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 650px;
    margin: 0 auto;
    line-height: 1.6;
    font-weight: 400;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.video-card {
    background: var(--white);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    transition: var(--transition);
    position: relative;
    border: 1px solid rgba(26, 188, 156, 0.08);
    grid-column: span 2;
    display: flex;
    flex-direction: column;
}

/* Featured Row (Top 2) */
.video-card.featured-row {
    grid-column: span 3;
}

.video-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(26, 188, 156, 0.3);
}

.video-thumbnail-wrap {
    position: relative;
    width: 100%;
    padding-top: 56.25%;
    /* 16:9 Aspect Ratio */
    overflow: hidden;
    background: #edf2f7;
}

.video-thumbnail {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.video-card:hover .video-thumbnail {
    transform: scale(1.05);
}

.video-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--primary);
    color: var(--white);
    padding: 6px 12px;
    border-radius: 10px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    z-index: 10;
    box-shadow: 0 4px 8px rgba(26, 188, 156, 0.2);
}

.video-content {
    padding: 24px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.video-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-main);
    line-height: 1.35;
}

.video-subtitle {
    color: var(--primary);
    font-size: 0.9rem;
    margin-bottom: 4px;
    font-weight: 600;
}

.video-stats {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.video-btns {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: auto;
}

.watch-now-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--primary);
    color: var(--white);
    padding: 10px 20px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition);
}

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

.read-guide-btn {
    display: inline-flex;
    align-items: center;
    padding: 10px 20px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-main);
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.read-guide-btn:hover {
    background: #f1f5f9;
    border-color: rgba(0, 0, 0, 0.2);
}

.watch-now-btn svg {
    width: 16px;
    height: 16px;
}

/* Support Section */
.support-section {
    padding: 80px 0;
    background: #fff;
}

.support-card {
    background: var(--white);
    border-radius: 32px;
    padding: 60px 40px;
    text-align: center;
    box-shadow: var(--shadow-soft);
    border: 1px solid rgba(26, 188, 156, 0.1);
    max-width: 900px;
    margin: 0 auto;
}

.support-card h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 20px;
    color: var(--text-main);
}

.support-card p {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.support-btns {
    display: flex;
    justify-content: center;
    gap: 16px;
}

.contact-btn {
    background: var(--primary);
    color: var(--white);
    padding: 14px 32px;
    border-radius: 16px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
}

.whatsapp-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: #25d366;
    color: var(--white);
    padding: 14px 32px;
    border-radius: 16px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(37, 211, 102, 0.2);
}

.whatsapp-btn:hover {
    background: #1ebe57;
    transform: translateY(-2px);
}



/* Responsive */
@media (max-width: 1200px) {
    .section-heading {
        font-size: 3rem;
    }
}

@media (max-width: 991px) {
    .video-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .video-card {
        grid-column: span 2;
    }

    .video-card.featured-row {
        grid-column: span 2;
    }
}

@media (max-width: 768px) {
    .how-to-use-hero {
        padding: 160px 0 40px;
    }

    .section-heading {
        font-size: 2.2rem;
    }

    .video-grid {
        grid-template-columns: 1fr;
    }

    .video-card,
    .video-card.featured-row {
        grid-column: span 1;
    }

    .support-card {
        padding: 40px 24px;
    }

    .support-card h2 {
        font-size: 2rem;
    }

    .support-btns {
        flex-direction: column;
    }
}

/* Mobile Header Styles */
.mobile-header {
    background: #ffffff;
    border-bottom: 1px solid #e0e0e0;
    padding: 12px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    max-width: 1200px;
    margin: 0 auto;
}

.header-title-text {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1a1a1a;
    margin: 0;
    text-align: center;
}

.header-icon-btn {
    color: #333;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: var(--transition);
}

.header-icon-btn:hover {
    color: var(--primary);
}