:root {
    --color-primary: #0A1628;
    --color-secondary: #1E3A5F;
    --color-accent: #FF6B35;
    --color-accent-hover: #FF8C5A;
    --color-tech-blue: #4A90D9;
    --color-light-bg: #E8F1F8;
    --color-text-dark: #1A1A1A;
    --color-text-medium: #4A4A4A;
    --color-text-light: #FFFFFF;
    --color-text-muted: #E0E8F0;

    --shadow-light: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-medium: 0 4px 16px rgba(0,0,0,0.12);
    --shadow-heavy: 0 8px 24px rgba(0,0,0,0.16);

    --radius-card: 8px;
    --radius-button: 4px;
    --radius-input: 4px;

    --font-title: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-body: 'PingFang SC', 'Microsoft YaHei', sans-serif;

    --transition-fast: 200ms ease-in-out;
    --transition-normal: 300ms ease-out;
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul {
    list-style: none;
}

button {
    border: none;
    outline: none;
    cursor: pointer;
    font-family: inherit;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

@media (max-width: 767px) {
    .container {
        padding: 0 16px;
    }
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-title);
    font-weight: 700;
    line-height: 1.3;
}

h1 { font-size: 56px; }
h2 { font-size: 40px; }
h3 { font-size: 24px; }

p {
    color: var(--color-text-muted);
}

@media (max-width: 767px) {
    h1 { font-size: 36px; }
    h2 { font-size: 28px; }
    h3 { font-size: 20px; }
}