/* style.css */
:root {
    --primary: #1a1a2e;
    --secondary: #16213e;
    --accent: #4a6bff;
    --light: #f8f9ff;
    --gray: #7a7a90;
    --radius: 18px;
    --shadow: 0 20px 40px rgba(0,0,0,.08);
}

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

body {
    font-family: "Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
    background: linear-gradient(135deg,#f8f9ff,#eef1ff);
    color: var(--primary);
    line-height: 1.75;
}

nav {
    max-width: 1200px;
    margin: 30px auto;
    padding: 18px 32px;
    background: rgba(255,255,255,.9);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.6rem;
    font-weight: 700;
    display: flex;
    gap: 10px;
    align-items: center;
}

.logo i { color: var(--accent); }

.nav-links a {
    margin-left: 30px;
    text-decoration: none;
    color: var(--primary);
    font-weight: 500;
}

.hero {
    max-width: 1200px;
    margin: 60px auto;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    display: flex;
    overflow: hidden;
}

.hero-image {
    flex: 1;
    background: linear-gradient(135deg,var(--primary),var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,.15);
    font-size: 5rem;
}

.hero-content {
    flex: 1;
    padding: 70px 60px;
}

.tag {
    display: inline-block;
    padding: 6px 18px;
    background: rgba(74,107,255,.1);
    color: var(--accent);
    border-radius: 999px;
    font-size: .9rem;
    font-weight: 600;
    margin-bottom: 25px;
}

h1 {
    font-size: 2.4rem;
    margin-bottom: 30px;
}

h2 {
    font-size: 2rem;
    margin-bottom: 25px;
}

h3 {
    font-size: 1.3rem;
    margin: 25px 0 15px;
}

p {
    color: var(--gray);
    margin-bottom: 18px;
    font-size: 1.05rem;
}

.features {
    display: flex;
    gap: 25px;
    margin: 35px 0;
    flex-wrap: wrap;
}

.feature {
    display: flex;
    gap: 10px;
    align-items: center;
    font-weight: 500;
}

.feature i { color: var(--accent); }

.btn {
    padding: 15px 42px;
    background: linear-gradient(90deg,var(--accent),#6d8aff);
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
}

.btn-outline {
    background: transparent;
    color: var(--accent);
    border: 2px solid var(--accent);
}

section {
    max-width: 1100px;
    margin: 100px auto;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 70px 60px;
}

ul {
    padding-left: 20px;
    margin-bottom: 25px;
}

ul li {
    margin-bottom: 10px;
    color: var(--gray);
}

footer {
    margin-top: 120px;
    padding: 60px 20px;
    background: var(--primary);
    color: rgba(255,255,255,.8);
    text-align: center;
}

footer strong { color: white; }

@media(max-width:900px){
    .hero { flex-direction: column; }
    .hero-image { display: none; }
    .hero-content { padding: 50px 35px; }
}