/* Critical CSS - Above the fold styles only */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-blue: #007AFF;
    --secondary-blue: #5856D6;
    --accent-blue: #0066CC;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --border-color: #e5e5ea;
    --success-color: #34C759;
    --gradient-primary: linear-gradient(135deg, #007AFF 0%, #5856D6 100%);
    --gradient-success: linear-gradient(135deg, #34C759 0%, #28A745 100%);
    --shadow-light: 0 2px 12px rgba(0, 0, 0, 0.08);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.12);
    --border-radius: 12px;
    --max-width: 1200px;
    --section-padding: 80px 0;
}

[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --border-color: #404040;
    --shadow-light: 0 2px 12px rgba(0, 0, 0, 0.3);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.4);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: all 0.3s ease;
    overflow-x: hidden;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

/* Enable backdrop-filter only on devices that support it and prefer reduced transparency */
@supports (backdrop-filter: blur(10px)) {
    @media (min-width: 768px) {
        .header {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
        }

        [data-theme="dark"] .header {
            background: rgba(26, 26, 26, 0.95);
        }
    }
}

[data-theme="dark"] .header {
    background: rgba(26, 26, 26, 0.98);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    transition: color 0.3s ease;
}

.logo-img {
    height: 40px;
    width: 40px;
    margin-left: 10px;
    transition: all 0.3s ease;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 20px;
}

.theme-toggle {
    background: none;
    border: 2px solid var(--border-color);
    border-radius: 25px;
    padding: 8px 12px;
    cursor: pointer;
    font-size: 16px;
    transition: all 0.3s ease;
}

/* Hero Section */
.feature-screens {
    padding: 120px 0 80px;
    text-align: center;
    background: linear-gradient(135deg, rgba(0, 122, 255, 0.05) 0%, rgba(88, 86, 214, 0.05) 100%);
}

.hero-trust {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 25px;
    font-weight: 500;
    animation: fadeInDown 0.6s ease;
}

.feature-screens h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: 20px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2.5vw, 1.3rem);
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
    animation: fadeInUp 1s ease;
}

.hero-ctas {
    display: flex;
    gap: 15px;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 25px;
    animation: fadeInUp 1.2s ease;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    padding: 16px 32px;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 18px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.cta-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-medium);
}

.cta-secondary {
    background: white;
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
    box-shadow: var(--shadow-light);
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    .hero-ctas {
        flex-direction: column;
        width: 100%;
        padding: 0 20px;
    }

    .cta-button {
        width: 100%;
        justify-content: center;
    }

    .container {
        padding: 0 15px;
    }
}