/* ========================================
   尧图网站建设 - 全局样式文件
   咖啡Ins风 | 奶白 + 浅棕 + 浅蓝
   ======================================== */

:root {
    --color-cream: #FDF8F3;
    --color-cream-dark: #F5EBE0;
    --color-brown-light: #D4C4B7;
    --color-brown: #A69081;
    --color-brown-dark: #8B7355;
    --color-blue-light: #E8F4F8;
    --color-blue: #B8D8E8;
    --color-blue-dark: #7BA7C7;
    --color-text: #4A4A4A;
    --color-text-light: #6B6B6B;
    --color-white: #FFFFFF;
    --color-border: #E5DDD5;
    --shadow-soft: 0 4px 20px rgba(139, 115, 85, 0.08);
    --shadow-medium: 0 8px 30px rgba(139, 115, 85, 0.12);
    --shadow-hard: 0 12px 40px rgba(139, 115, 85, 0.15);
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

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

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

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--color-cream);
    color: var(--color-text);
    line-height: 1.7;
    overflow-x: hidden;
    position: relative;
}

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;
}

@media (max-width: 1200px) {
    .container {
        padding: 0 30px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }
}

/* ========================================
   顶部导航栏
   ======================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: transparent;
    transition: var(--transition-smooth);
    padding: 25px 0;
}

.header.scrolled {
    background: rgba(253, 248, 243, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-soft);
    padding: 15px 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-img {
    width: 50px;
    height: 50px;
    object-fit: cover;
    border-radius: 8px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-brown-dark);
    letter-spacing: 1px;
}

.nav-menu {
    display: flex;
    gap: 40px;
}

.nav-link {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text);
    position: relative;
    padding: 8px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-blue-dark);
    transition: var(--transition-smooth);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-blue-dark);
}

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

.hamburger span {
    width: 28px;
    height: 3px;
    background: var(--color-brown-dark);
    border-radius: 2px;
    transition: var(--transition-smooth);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

@media (max-width: 992px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 300px;
        height: 100vh;
        background: var(--color-cream);
        flex-direction: column;
        padding: 100px 40px;
        gap: 25px;
        transition: var(--transition-smooth);
        box-shadow: var(--shadow-hard);
    }

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

    .hamburger {
        display: flex;
    }
}

/* ========================================
   页脚
   ======================================== */

.footer {
    background: var(--color-brown-dark);
    color: var(--color-cream);
    padding: 80px 0 40px;
    margin-top: 100px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 50px;
    margin-bottom: 60px;
}

@media (max-width: 992px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

.footer-section h4 {
    font-size: 1.2rem;
    margin-bottom: 25px;
    color: var(--color-blue);
    position: relative;
    padding-bottom: 12px;
}

.footer-section h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--color-blue);
}

.footer-links li {
    margin-bottom: 15px;
}

.footer-links a {
    color: var(--color-cream-dark);
    font-size: 0.95rem;
    transition: var(--transition-smooth);
}

.footer-links a:hover {
    color: var(--color-blue);
    padding-left: 8px;
}

.footer-contact li {
    margin-bottom: 18px;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    color: var(--color-cream-dark);
    font-size: 0.95rem;
}

.footer-bottom {
    border-top: 1px solid rgba(253, 248, 243, 0.2);
    padding-top: 30px;
    text-align: center;
    color: var(--color-cream-dark);
    font-size: 0.9rem;
}

/* ========================================
   通用动画
   ======================================== */

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* ========================================
   按钮样式
   ======================================== */

.btn {
    display: inline-block;
    padding: 14px 35px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: none;
    text-align: center;
}

.btn-primary {
    background: var(--color-blue-dark);
    color: var(--color-white);
}

.btn-primary:hover {
    background: var(--color-brown-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.btn-secondary {
    background: transparent;
    color: var(--color-brown-dark);
    border: 2px solid var(--color-brown-dark);
}

.btn-secondary:hover {
    background: var(--color-brown-dark);
    color: var(--color-white);
    transform: translateY(-3px);
}

/* ========================================
   卡片样式
   ======================================== */

.card {
    background: var(--color-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-medium);
}

.card-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
}

.card-content {
    padding: 25px;
}

.card-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--color-brown-dark);
}

.card-text {
    color: var(--color-text-light);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ========================================
   标题样式
   ======================================== */

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 2.5rem;
    color: var(--color-brown-dark);
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--color-blue-dark);
}

.section-title p {
    color: var(--color-text-light);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 25px auto 0;
}

/* ========================================
   网格布局
   ======================================== */

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

@media (max-width: 992px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
}