:root {
    --color-primary: #149C5C;
    --color-primary-dark: #0E7A47;
    --color-primary-light: #1DB96E;
    --color-accent: #D4A853;
    --color-bg: #FFFFFF;
    --color-bg-alt: #F5F7FA;
    --color-text: #1A1A2E;
    --color-text-light: #6B7280;
    --color-dark: #1A1A2E;
    --color-white: #FFFFFF;
    --color-border: #E5E7EB;

    --font-en: 'Inter', sans-serif;
    --font-cn: 'Noto Sans SC', sans-serif;
    --font-body: var(--font-en), var(--font-cn);

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);

    --container: 1200px;
    --gap: 24px;

    --header-h: 72px;
    --topbar-h: 36px;
}

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

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

body {
    font-family: var(--font-body);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }
input, textarea, select { font: inherit; }

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--gap);
}

/* 按钮系统 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.938rem;
    transition: all 0.25s ease;
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
}
.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-accent {
    background: var(--color-accent);
    color: var(--color-white);
}
.btn-accent:hover {
    background: #C49A48;
    transform: translateY(-1px);
}

.btn-white {
    background: var(--color-white);
    color: var(--color-primary);
}
.btn-white:hover {
    background: #f0f0f0;
}

/* 区块标题 */
.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-light);
    max-width: 680px;
    margin: 0 auto 48px;
    font-size: 1rem;
    line-height: 1.7;
}

/* 响应式断点 */
@media (max-width: 1024px) {
    :root { --gap: 20px; }
}
@media (max-width: 768px) {
    :root { --gap: 16px; --header-h: 60px; }
}
@media (max-width: 480px) {
    :root { --gap: 12px; }
}