:root {
    --bg-color: #050505;
    --terminal-green: #33ff33;
    --text-main: #ffffff;
    --text-muted: #888888;
    --sky-blue: #00ccff;
    --border-color: #222222;
    --font-main: "Inter", sans-serif;
    --font-heading: "Space Grotesk", sans-serif;
}

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

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

nav {
    display: flex;
    justify-content: space-between;
    padding: 2rem 5%;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 100;
    background: rgba(5, 5, 5, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #112211; /* 深绿感边框 */
}

.logo {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: 2px;
    font-size: 1.2rem;
    color: var(--terminal-green);
    text-shadow: 0 0 8px rgba(51, 255, 51, 0.4);
}

.nav-links a {
    color: var(--terminal-green);
    text-decoration: none;
    margin-left: 2rem;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.7;
    transition: 0.3s;
}

.nav-links a:hover {
    opacity: 1;
    text-shadow: 0 0 5px var(--terminal-green);
}

.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    padding: 0 10%;
}

.hero-content h1 {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 8vw, 5rem);
    line-height: 1.1;
    max-width: 900px;
    margin-bottom: 2rem;
    color: var(--text-main);
}

.gradient-text {
    color: var(--sky-blue);
    text-shadow: 0 0 15px rgba(0, 204, 255, 0.3);
}

.hero-content p {
    font-size: 1.2rem;
    max-width: 500px;
    color: var(--text-muted);
    margin-bottom: 3rem;
}

.btn-primary {
    background: var(--sky-blue);
    color: #000;
    margin-right: 1rem;
    padding: 1rem 2rem;
    text-decoration: none;
    font-weight: 600;
    border-radius: 4px;
}

.btn-secondary {
    border: 1px solid var(--text-muted);
    color: var(--text-main);
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 4px;
}

.content-section {
    padding: 5rem 10%;
}

hr {
    border: 0;
    border-top: 1px solid var(--border-color);
    margin-bottom: 3rem;
}

.grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 2rem;
}

.label {
    font-family: var(--font-heading);
    color: var(--text-muted);
    font-size: 0.8rem;
    letter-spacing: 3px;
}

.description p {
    font-size: 1.5rem;
    color: var(--text-main);
}

.focus-item h3 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    color: var(--sky-blue);
}

.focus-item p {
    font-size: 1.1rem;
    color: var(--text-muted);
}

footer {
    padding: 5rem 10% 2rem;
    border-top: 1px solid var(--border-color);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.socials a {
    color: var(--text-muted);
    margin-left: 1.5rem;
    text-decoration: none;
}

@media (max-width: 768px) {
    .grid {
        grid-template-columns: 1fr;
    }
}