:root {
    --primary-color: #ff2442;
    --secondary-color: #07c160;
    --text-color: #333;
    --bg-color: #f7f8fa;
    --white: #ffffff;
    --gray: #888;
    --light-gray: #f0f0f0;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

header {
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 2rem;
}

nav ul li a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: var(--primary-color);
}

.hero {
    max-width: 1200px;
    margin: 4rem auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.hero-content {
    flex: 1;
    padding-right: 2rem;
}

.hero h1 {
    font-size: 3rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: #111;
}

.hero p {
    font-size: 1.2rem;
    color: var(--gray);
    margin-bottom: 2rem;
}

.hero-btns {
    display: flex;
    gap: 1rem;
}

.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    cursor: pointer;
}

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

.btn-primary:hover {
    background-color: #e01f3a;
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    background-color: #e0e0e0;
}

.hero-image img {
    max-width: 100%;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

.features {
    background-color: var(--white);
    padding: 6rem 2rem;
    text-align: center;
}

.features h2 {
    font-size: 2.5rem;
    margin-bottom: 4rem;
}

.feature-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    padding: 3rem 2rem;
    border-radius: 12px;
    background-color: var(--bg-color);
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

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

.feature-card p {
    color: var(--gray);
}

.pricing {
    padding: 6rem 2rem;
    text-align: center;
}

.pricing h2 {
    font-size: 2.5rem;
    margin-bottom: 4rem;
}

.pricing-grid {
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.pricing-card {
    background-color: var(--white);
    padding: 3rem 2rem;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    position: relative;
    border: 2px solid transparent;
}

.pricing-card.featured {
    border-color: var(--primary-color);
}

.pricing-card .badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background-color: var(--primary-color);
    color: var(--white);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 700;
}

.pricing-card h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.price {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

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

.pricing-card ul {
    list-style: none;
    text-align: left;
    margin-bottom: 2rem;
}

.pricing-card ul li {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.pricing-card ul li i.fa-check {
    color: var(--secondary-color);
}

.pricing-card ul li i.fa-times {
    color: #ff4d4f;
}

.download {
    background-color: #111;
    color: var(--white);
    padding: 6rem 2rem;
    text-align: center;
}

.download h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.download p {
    font-size: 1.2rem;
    margin-bottom: 3rem;
    opacity: 0.8;
}

.btn-lg {
    padding: 1.2rem 3rem;
    font-size: 1.2rem;
}

.note {
    margin-top: 1.5rem;
    font-size: 0.9rem;
    opacity: 0.6;
}

footer {
    padding: 3rem 2rem;
    text-align: center;
    background-color: var(--white);
    border-top: 1px solid var(--light-gray);
}

footer p {
    color: var(--gray);
    margin-bottom: 0.5rem;
}

@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
    }
    .hero-content {
        padding-right: 0;
        margin-bottom: 3rem;
    }
    .hero h1 {
        font-size: 2.5rem;
    }
    nav ul {
        display: none;
    }
}