/* 认知原子 - 公共样式 */
:root {
    --primary: #0a1f44;
    --secondary: #0090ff;
    --accent: #9d4edd;
    --light: #f8f9fa;
    --dark: #212529;
    --gray: #6c757d;
    --transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

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

body {
    font-family: 'Noto Sans SC', 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: linear-gradient(135deg, #f0f4f8 0%, #e6e9ff 100%);
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
header {
    background: rgba(10, 31, 68, 0.95);
    padding: 15px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

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

.logo {
    display: flex;
    align-items: center;
}

.logo h1 {
    color: white;
    font-size: 1.8rem;
    font-weight: 700;
    margin-left: 12px;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
}

.logo-icon {
    width: 50px;
    height: 50px;
    background: var(--secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.logo-icon::before {
    content: "";
    position: absolute;
    width: 30px;
    height: 30px;
    background: var(--primary);
    border-radius: 50%;
}

.logo-icon::after {
    content: "";
    position: absolute;
    width: 15px;
    height: 15px;
    background: var(--accent);
    border-radius: 50%;
    transform: translate(15px, -15px);
}

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

nav li {
    margin-left: 30px;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    font-size: 1.1rem;
    transition: var(--transition);
    padding: 8px 12px;
    border-radius: 4px;
}

nav a:hover, nav a.active {
    background: rgba(0, 180, 216, 0.2);
    color: var(--secondary);
}

.cta-button {
    background: var(--secondary);
    color: white;
    border: none;
    padding: 12px 28px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(0, 180, 216, 0.3);
}

.cta-button:hover {
    background: #0093b0;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 180, 216, 0.4);
}