:root {
    --primary-color: #E2231A; /* Lenovo Red */
    --primary-hover: #c91b13;
    --bg-dark: #121212;
    --bg-card: #1E1E1E;
    --text-main: #FFFFFF;
    --text-muted: #A0A0A0;
    --accent-glow: rgba(226, 35, 26, 0.3);
    --font-main: 'Noto Sans SC', 'Roboto', sans-serif;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: 500;
    transition: var(--transition);
    cursor: pointer;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-outline {
    border: 2px solid var(--text-main);
    color: var(--text-main);
    margin-left: 15px;
}

.btn-outline:hover {
    background-color: white;
    color: var(--bg-dark);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 15px 40px;
    font-size: 1.1rem;
}

.btn-xl {
    padding: 18px 50px;
    font-size: 1.2rem;
    font-weight: 700;
}

/* Header */
.header {
    padding: 20px 0;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(18, 18, 18, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.nav a {
    margin-left: 30px;
    font-size: 0.95rem;
    color: var(--text-muted);
    transition: var(--transition);
}

.nav a:hover, .nav a.active {
    color: var(--text-main);
}

.nav .btn {
    margin-left: 30px;
    padding: 8px 20px;
    font-size: 0.9rem;
}

/* Hero Section */
.hero {
    padding: 160px 0 100px;
    position: relative;
    overflow: hidden;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.hero h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 20px;
    background: linear-gradient(to right, #fff, #ccc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 40px;
    max-width: 500px;
}

.hero-stats {
    margin-top: 50px;
    display: flex;
    gap: 50px;
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 30px;
}

.stat-num {
    display: block;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-main);
}

.stat-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
}

.app-mockup {
    width: 100%;
    max-width: 500px;
    border-radius: 20px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    position: relative;
    z-index: 2;
    transform: perspective(1000px) rotateY(-10deg) rotateX(5deg);
    transition: transform 0.5s ease;
}

.hero-image:hover .app-mockup {
    transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
}

.hero-bg-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120%;
    height: 120%;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    z-index: 1;
    filter: blur(60px);
}

/* Features Section */
.features {
    padding: 100px 0;
    background-color: #181818;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 60px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    background-color: var(--bg-card);
    padding: 40px 30px;
    border-radius: 20px;
    transition: var(--transition);
    border: 1px solid rgba(255,255,255,0.05);
}

.feature-card:hover {
    transform: translateY(-10px);
    background-color: #252525;
    border-color: rgba(255,255,255,0.1);
}

.feature-card .icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
}

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

/* How It Works */
.how-it-works {
    padding: 100px 0;
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 50px;
}

.step {
    position: relative;
    padding-top: 20px;
}

.step-num {
    font-size: 4rem;
    font-weight: 700;
    color: rgba(255,255,255,0.05);
    position: absolute;
    top: -20px;
    left: 0;
    z-index: 0;
}

.step h3 {
    position: relative;
    z-index: 1;
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.step p {
    position: relative;
    z-index: 1;
    color: var(--text-muted);
}

.step code {
    display: block;
    background: #000;
    padding: 10px;
    border-radius: 5px;
    margin-top: 10px;
    font-family: monospace;
    font-size: 0.85rem;
    color: #0f0;
    overflow-x: auto;
}

/* Download Section */
.download {
    padding: 120px 0;
    text-align: center;
    background: linear-gradient(180deg, var(--bg-dark) 0%, #2a0a0a 100%);
}

.download h2 {
    font-size: 3rem;
    margin-bottom: 20px;
}

.download p {
    color: var(--text-muted);
    margin-bottom: 40px;
    font-size: 1.2rem;
}

.version-info {
    margin-top: 20px;
    font-size: 0.9rem !important;
    opacity: 0.7;
}

/* Footer */
.footer {
    padding: 50px 0;
    border-top: 1px solid rgba(255,255,255,0.05);
    text-align: center;
}

.footer-links {
    margin-bottom: 20px;
}

.footer-links a {
    margin: 0 15px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

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

.copyright {
    color: rgba(255,255,255,0.3);
    font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero p {
        margin: 0 auto 40px;
    }

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

    .btn-outline {
        margin-left: 0;
    }

    .hero-stats {
        justify-content: center;
    }

    .steps {
        grid-template-columns: 1fr;
        gap: 60px;
    }

    .step {
        text-align: center;
    }

    .step-num {
        left: 50%;
        transform: translateX(-50%);
    }
}