:root {
    --lenovo-red: #E2231A;
    --lenovo-black: #000000;
    --lenovo-dark-gray: #333333;
    --lenovo-gray: #666666;
    --lenovo-light-gray: #F5F5F5;
    --lenovo-white: #FFFFFF;
    --font-family: "Lenovo-Standard", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

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

body {
    font-family: var(--font-family);
    color: var(--lenovo-black);
    line-height: 1.5;
    background-color: var(--lenovo-white);
}

a {
    text-decoration: none;
    color: inherit;
    transition: 0.2s ease-in-out;
}

ul {
    list-style: none;
}

/* Header & Nav */
header {
    position: sticky;
    top: 0;
    width: 100%;
    background: var(--lenovo-white);
    z-index: 1000;
    border-bottom: 1px solid #E5E5E5;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    height: 60px;
}

.logo img {
    height: 30px;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    font-size: 14px;
    font-weight: 500;
    color: var(--lenovo-black);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--lenovo-red);
}

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

/* Hero Section */
.hero {
    position: relative;
    height: 500px;
    background-color: #000;
    color: var(--lenovo-white);
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    z-index: 2;
}

.hero-content h1 {
    font-size: 56px;
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.1;
}

.hero-content p {
    font-size: 18px;
    max-width: 600px;
    margin-bottom: 32px;
}

.btn-lenovo {
    display: inline-block;
    padding: 12px 32px;
    background-color: var(--lenovo-red);
    color: var(--lenovo-white);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 14px;
    transition: background-color 0.2s;
}

.btn-lenovo:hover {
    background-color: #C11D16;
}

/* Section Common */
section {
    padding: 80px 40px;
    max-width: 1400px;
    margin: 0 auto;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 40px;
    text-align: left;
    border-bottom: 2px solid var(--lenovo-red);
    display: inline-block;
    padding-bottom: 8px;
}

/* Grid & Cards (Lenovo Style - Clean and Blocky) */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.card {
    background: var(--lenovo-light-gray);
    padding: 32px;
    border: 1px solid transparent;
    transition: border-color 0.2s, box-shadow 0.2s;
    height: 100%;
}

.card:hover {
    border-color: var(--lenovo-red);
    background: var(--lenovo-white);
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.card h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 16px;
}

.card p {
    color: var(--lenovo-dark-gray);
    font-size: 15px;
}

/* Footer (Lenovo Style - Dark and Informative) */
footer {
    background-color: var(--lenovo-black);
    color: #999;
    padding: 60px 40px 30px;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    border-bottom: 1px solid #333;
    padding-bottom: 40px;
}

.footer-section h4 {
    color: var(--lenovo-white);
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 20px;
    text-transform: uppercase;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a:hover {
    color: var(--lenovo-white);
}

.footer-bottom {
    max-width: 1400px;
    margin: 20px auto 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
}

.footer-legal a {
    margin-left: 20px;
}

.footer-legal a:hover {
    color: var(--lenovo-white);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero-content h1 { font-size: 36px; }
    .hero { height: 400px; }
    .footer-bottom { flex-direction: column; gap: 15px; text-align: center; }
}