:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --success: #16a34a;
    --success-hover: #15803d;
    --text-dark: #111827;
    --text-light: #4b5563;
    --bg-white: #ffffff;
    --bg-grey: #f9fafb;
    --border: #e5e7eb;
    --ad-bg: #f3f4f6;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-dark);
    background-color: var(--bg-white);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navbar */
.navbar {
    height: 70px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border);
    background: #fff;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.logo span {
    color: var(--primary);
}

/* Header & Hero */
.header {
    padding: 60px 0;
    text-align: center;
}

.hero-text h1 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -1px;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.hero-text p {
    font-size: 1.25rem;
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto 40px;
}

.main-ctas {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    padding: 14px 32px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    border: none;
    display: inline-block;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-success {
    background: var(--success);
    color: white;
}

.btn-success:hover {
    background: var(--success-hover);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--border);
    color: var(--text-dark);
}

.btn-outline:hover {
    border-color: var(--text-dark);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.875rem;
}

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

/* Ad Placeholders */
.ad-placeholder {
    background: var(--ad-bg);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #9ca3af;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    margin: 20px auto;
}

.top-ad {
    min-height: 90px;
    max-width: 728px;
    width: 100%;
}

.rect-ad {
    width: 300px;
    height: 250px;
}

.large-rect-ad {
    width: 336px;
    height: 280px;
}

.flex-center {
    display: flex;
    justify-content: center;
}

/* Sections */
.section {
    padding: 80px 0;
}

.grey-bg {
    background: var(--bg-grey);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.badge {
    display: inline-block;
    background: #dbeafe;
    color: var(--primary);
    padding: 4px 12px;
    border-radius: 99px;
    font-size: 0.8rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 60px;
    align-items: start;
}

.details h3 {
    font-size: 2rem;
    margin-bottom: 20px;
}

.video-info-box {
    background: var(--bg-grey);
    padding: 25px;
    border-radius: 12px;
    margin: 30px 0;
    border: 1px solid var(--border);
}

.info-item {
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
}

.info-item:last-child {
    border-bottom: none;
}

.action-buttons-group {
    display: flex;
    gap: 10px;
}

.btn-action {
    background: white;
    border: 1px solid var(--border);
    padding: 15px 25px;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    flex: 1;
    transition: all 0.2s;
}

.btn-action:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* Download Grid */
.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 50px;
}

.download-item {
    background: white;
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--border);
    transition: transform 0.2s;
}

.download-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
}

.download-item .ico {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 15px;
}

.mt-10 { margin-top: 20px; }

/* Footer */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--text-light);
}

.f-links {
    margin-top: 15px;
}

.f-links a {
    margin: 0 10px;
    color: var(--text-light);
    text-decoration: none;
    font-size: 0.85rem;
}

.f-links a:hover {
    color: var(--primary);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-text h1 {
        font-size: 2.25rem;
    }
    
    .content-grid {
        grid-template-columns: 1fr;
    }
    
    .ad-area {
        display: flex;
        justify-content: center;
    }
    
    .top-ad {
        height: auto;
    }
}