/* 
 * 北京尧图网络科技有限公司 - 全局样式
 * 书店ins风 | 米黄 + 浅棕 + 浅蓝
 */

:root {
    --color-cream: #F5F0E6;
    --color-beige: #E8DCC4;
    --color-brown-light: #C4A87C;
    --color-brown: #8B7355;
    --color-brown-dark: #5D4E37;
    --color-blue-light: #B8C5D6;
    --color-blue: #7A8B9E;
    --color-blue-dark: #4A5A6A;
    --color-white: #FFFFFF;
    --color-text: #3D3D3D;
    --color-text-light: #666666;
    --shadow-soft: 0 4px 20px rgba(139, 115, 85, 0.1);
    --shadow-medium: 0 8px 30px rgba(139, 115, 85, 0.15);
    --transition-smooth: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Georgia', 'Times New Roman', serif;
    background-color: var(--color-cream);
    color: var(--color-text);
    line-height: 1.8;
    overflow-x: hidden;
}

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

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

ul, ol {
    list-style: none;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

/* ========== 导航栏 ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition-smooth);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(245, 240, 230, 0.98);
    box-shadow: var(--shadow-soft);
    padding: 15px 0;
}

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

.navbar-logo {
    font-size: 28px;
    font-weight: bold;
    color: var(--color-brown-dark);
    letter-spacing: 2px;
}

.navbar-logo span {
    color: var(--color-blue);
}

.navbar-menu {
    display: flex;
    gap: 35px;
}

.navbar-menu li a {
    font-size: 15px;
    color: var(--color-brown-dark);
    position: relative;
    padding: 5px 0;
}

.navbar-menu li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-blue);
    transition: var(--transition-smooth);
}

.navbar-menu li a:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background: var(--color-brown-dark);
    transition: var(--transition-smooth);
}

/* ========== 页脚 ========== */
.footer {
    background: var(--color-brown-dark);
    color: var(--color-cream);
    padding: 60px 0 30px;
    margin-top: 100px;
}

.footer-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--color-beige);
}

.footer-section p,
.footer-section li {
    font-size: 14px;
    color: var(--color-blue-light);
    margin-bottom: 10px;
    line-height: 1.8;
}

.footer-section ul li a:hover {
    color: var(--color-beige);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 13px;
    color: var(--color-blue-light);
}

/* ========== 通用动画 ========== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========== 响应式 ========== */
@media (max-width: 968px) {
    .navbar-menu {
        position: fixed;
        top: 70px;
        right: -100%;
        width: 280px;
        height: calc(100vh - 70px);
        background: var(--color-cream);
        flex-direction: column;
        padding: 40px;
        gap: 25px;
        transition: var(--transition-smooth);
        box-shadow: -5px 0 20px rgba(0,0,0,0.1);
    }

    .navbar-menu.active {
        right: 0;
    }

    .hamburger {
        display: flex;
    }

    .container {
        padding: 0 20px;
    }
}