/* Variables & Reset */
:root {
    --bg-color: #0d0d0d;
    --card-bg: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #a1a1a6;
    --primary-color: #2979ff;
    --primary-hover: #1c54b2;
    --accent-gradient: linear-gradient(135deg, #2979ff 0%, #7b2cbf 100%);
    --card-border: rgba(255, 255, 255, 0.1);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --container-width: 1200px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

/* Typography */
h1,
h2,
h3,
h4 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: 3rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 2rem;
}

p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.highlight {
    color: var(--primary-color);
}

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 99px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    transition: var(--transition);
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 15px rgba(41, 121, 255, 0.3);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(41, 121, 255, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

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

.btn-lg {
    padding: 16px 32px;
    font-size: 1.1rem;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.9rem;
}

.section {
    padding: 80px 0;
}

.section-title {
    margin-bottom: 1rem;
}

.section-subtitle {
    text-align: center;
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto 3rem;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    background: rgba(13, 13, 13, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    z-index: 1001;
}

.nav {
    display: flex;
    gap: 30px;
}

.nav a {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.nav a:hover {
    color: white;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1002;
}

.mobile-menu-toggle span {
    width: 100%;
    height: 2px;
    background-color: white;
    transition: var(--transition);
}

/* Hero */
.hero {
    padding-top: 180px;
    padding-bottom: 100px;
    text-align: center;
    background: radial-gradient(circle at 50% 20%, rgba(41, 121, 255, 0.15), transparent 60%);
}

.hero-subtitle {
    font-size: 1.25rem;
    max-width: 700px;
    margin: 1.5rem auto 2.5rem;
}

.hero-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.hero-note {
    font-size: 0.9rem;
    opacity: 0.7;
    margin-top: 10px;
}

/* Advantages */
.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 30px;
    border-radius: 20px;
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.advantage-card .icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.advantage-card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

/* Instruction Steps */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.step-item {
    text-align: center;
    padding: 20px;
}

.step-number {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--glass-bg);
    border: 1px solid var(--card-border);
    font-weight: 700;
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.center-btn {
    text-align: center;
}

/* Secondary CTA */
.cta-secondary {
    background: linear-gradient(rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0.8)), url('https://images.unsplash.com/photo-1550751827-4bd374c3f58b?auto=format&fit=crop&w=1500&q=80') center/cover;
    text-align: center;
    padding: 100px 0;
}

.cta-box h2 {
    margin-bottom: 1rem;
}

.price-tag {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-color);
    margin: 1.5rem 0;
}

/* Pricing */
.pricing-card {
    text-align: center;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.pricing-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.pricing-card .price {
    font-size: 2.5rem;
    font-weight: 700;
    color: white;
    margin-bottom: 0.5rem;
}

.pricing-card .price span {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.price-total {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.features-list {
    margin-bottom: 2rem;
    flex-grow: 1;
}

.features-list li {
    margin-bottom: 0.8rem;
    color: var(--text-secondary);
}

.pricing-card.popular {
    background: linear-gradient(135deg, rgba(41, 121, 255, 0.1), rgba(41, 121, 255, 0.02));
    border: 1px solid var(--primary-color);
    transform: scale(1.05);
    z-index: 1;
}

.pricing-card.popular:hover {
    transform: scale(1.08);
}

.label-popular {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: white;
    padding: 5px 15px;
    border-radius: 0 0 10px 10px;
    font-size: 0.8rem;
    font-weight: 600;
}

.label-discount {
    position: absolute;
    top: 15px;
    right: 15px;
    background: #ff3b30;
    color: white;
    font-size: 0.7rem;
    padding: 4px 8px;
    border-radius: 5px;
    font-weight: 700;
}

/* Platforms */
.platform-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 2rem;
}

.platform-card .icon-os {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.platform-card span {
    font-size: 0.85rem;
    color: var(--primary-color);
    margin-top: 0.5rem;
}

/* Reviews */
.reviews-grid {
    margin-top: 2rem;
}

.review-card {
    text-align: left;
}

.stars {
    margin-bottom: 1rem;
    font-size: 1rem;
}

.review-text {
    font-style: italic;
    color: #dedede;
    margin-bottom: 1.5rem;
}

.review-author {
    font-weight: 600;
    color: white;
}

/* Guarantee */
.guarantee-box {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 4rem 2rem;
    text-align: center;
    border: 1px solid var(--card-border);
}

.guarantee-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

/* SEO Text */
.seo-text-section {
    background: #111;
}

.seo-content {
    max-width: 900px;
    margin: 0 auto;
    color: #888;
}

.seo-content h2 {
    color: white;
    text-align: left;
    margin-top: 2rem;
}

.seo-content h3 {
    color: #ddd;
    margin-top: 1.5rem;
}

.seo-content ul {
    list-style: disc;
    margin-left: 1.5rem;
    margin-bottom: 1.5rem;
}

.seo-content li {
    margin-bottom: 0.5rem;
}

/* FAQ */
.faq-grid {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--card-bg);
    margin-bottom: 1rem;
    border-radius: 12px;
    border: 1px solid var(--card-border);
    transition: var(--transition);
}

.faq-item:hover {
    border-color: rgba(255, 255, 255, 0.3);
}

details {
    padding: 1.5rem;
    cursor: pointer;
}

summary {
    font-weight: 600;
    list-style: none;
    /* Hide default arrow */
    position: relative;
    padding-right: 30px;
}

summary::-webkit-details-marker {
    display: none;
}

summary::after {
    content: '+';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--primary-color);
}

details[open] summary::after {
    content: '-';
}

details p {
    margin-top: 1rem;
    margin-bottom: 0;
}

/* Footer */
.footer {
    border-top: 1px solid var(--card-border);
    padding: 60px 0 20px;
    background: #050505;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-col h4 {
    margin-bottom: 1.5rem;
}

.footer-col a {
    display: block;
    color: var(--text-secondary);
    margin-bottom: 0.8rem;
}

.footer-col a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 0.85rem;
    color: #555;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    h1 {
        font-size: 2.2rem;
    }

    h2 {
        font-size: 1.8rem;
    }

    .pricing-card.popular {
        transform: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .nav {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(13, 13, 13, 0.95);
        backdrop-filter: blur(15px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2rem;
        transform: translateY(-100%);
        transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
        z-index: 1000;
    }

    .nav.active {
        transform: translateY(0);
    }

    .nav a {
        font-size: 1.5rem;
        font-weight: 600;
    }

    /* Hamburger Animation */
    .mobile-menu-toggle.active span:nth-child(1) {
        transform: translateY(9px) rotate(45deg);
    }

    .mobile-menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-toggle.active span:nth-child(3) {
        transform: translateY(-9px) rotate(-45deg);
    }

    .header-container {
        padding: 0 10px;
    }

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

/* Animations */
.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(41, 121, 255, 0.7);
    }

    70% {
        box-shadow: 0 0 0 10px rgba(41, 121, 255, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(41, 121, 255, 0);
    }
}