:root {
    --primary-color: #0066CC;
    --primary-hover: #0052a3;
    --text-color: #1d1d1f;
    --text-secondary: #86868b;
    --bg-color: #ffffff;
    --bg-secondary: #f5f5f7;
    --border-color: #d2d2d7;
    --container-width: 1100px;
    --radius: 12px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

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

ul {
    list-style: none;
}

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

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

/* Header */
.header {
    height: 64px;
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    z-index: 1000;
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--primary-color);
}

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

.nav a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-color);
    opacity: 0.8;
}

.nav a:hover {
    opacity: 1;
    color: var(--primary-color);
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 18px;
    border-radius: 20px;
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    border: none;
    transition: var(--transition);
}

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

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

.btn-secondary {
    background-color: transparent;
    color: var(--text-color);
}

.btn-outline {
    background-color: transparent;
    border: 1.5px solid var(--primary-color);
    color: var(--primary-color);
}

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

.btn-large {
    padding: 14px 32px;
    font-size: 1.1rem;
    border-radius: 30px;
}

.btn-text {
    font-weight: 600;
    color: var(--primary-color);
}

.btn-text:hover {
    gap: 5px;
}

.full-width {
    width: 100%;
}

/* Hero Section */
.hero {
    padding: 80px 0;
    text-align: center;
    overflow: hidden;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.4rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 40px;
}

.hero-btns {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-bottom: 60px;
}

.hero-mockup {
    perspective: 1000px;
}

.mockup-frame {
    background: #000;
    border-radius: 24px;
    padding: 12px;
    box-shadow: 0 50px 100px rgba(0,0,0,0.1);
    transform: rotateX(10deg);
    max-width: 900px;
    margin: 0 auto;
}

.mockup-screen {
    background: #f0f0f2;
    border-radius: 12px;
    height: 400px;
    display: flex;
    overflow: hidden;
}

.mockup-sidebar {
    width: 60px;
    background: #fff;
    border-right: 1px solid rgba(0,0,0,0.05);
}

.mockup-grid {
    flex: 1;
    padding: 20px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
}

.mockup-item {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

/* Section Common */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 50px;
}

/* Features */
.features {
    padding: 100px 0;
    background-color: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--bg-color);
    padding: 40px 30px;
    border-radius: var(--radius);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.05);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.feature-title {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

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

/* Pricing */
.pricing {
    padding: 100px 0;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.pricing-card {
    padding: 40px;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: relative;
}

.pricing-card.featured {
    border-color: var(--primary-color);
    box-shadow: 0 20px 40px rgba(0, 102, 204, 0.08);
}

.card-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--primary-color);
    color: white;
    font-size: 0.75rem;
    padding: 4px 12px;
    border-radius: 20px;
    font-weight: 600;
}

.pricing-name {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.pricing-price {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 30px;
}

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

.pricing-features {
    margin-bottom: 40px;
    flex: 1;
}

.pricing-features li {
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
}

.pricing-features li::before {
    content: "✓";
    color: var(--primary-color);
    font-weight: bold;
}

/* FAQ */
.faq {
    padding: 100px 0;
    background-color: var(--bg-secondary);
}

.faq-list {
    max-width: 700px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-color);
    margin-bottom: 15px;
    border-radius: var(--radius);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 20px 30px;
    text-align: left;
    background: none;
    border: none;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question::after {
    content: "+";
    font-size: 1.5rem;
    transition: var(--transition);
}

.faq-item.active .faq-question::after {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 30px;
    max-height: 0;
    overflow: hidden;
    transition: var(--transition);
    color: var(--text-secondary);
}

.faq-item.active .faq-answer {
    padding-bottom: 20px;
    max-height: 200px;
}

/* Footer */
.footer {
    padding: 60px 0;
    border-top: 1px solid var(--border-color);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-info p {
    margin-top: 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    gap: 30px;
}

.footer-links a {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

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

/* Mobile Menu */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-color);
    transition: var(--transition);
}

/* Responsive */
@media (max-width: 768px) {
    .header-inner {
        padding: 10px 0;
    }

    .nav, .header-actions {
        display: none;
    }

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

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

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

    .mockup-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-inner {
        flex-direction: column;
        gap: 30px;
        text-align: center;
    }

    .footer-links {
        flex-direction: column;
        gap: 15px;
    }
}