/* ========================================
   佛山精工建站 - 全局样式表
   国风汉元素风格 | 米白 + 浅红 + 浅灰
   ======================================== */

/* CSS Reset & 基础变量 */
:root {
    --color-bg-primary: #f5f1e8;      /* 米白背景 */
    --color-bg-secondary: #e8e4d9;    /* 浅灰背景 */
    --color-accent: #c44a4a;          /* 浅红主色 */
    --color-accent-light: #d67272;    /* 浅红浅色 */
    --color-text-primary: #3d3d3d;    /* 深灰文字 */
    --color-text-secondary: #6b6b6b;  /* 中灰文字 */
    --color-text-light: #8c8c8c;      /* 浅灰文字 */
    --color-white: #ffffff;
    --color-border: #d4cfc4;
    --shadow-soft: 0 4px 12px rgba(61, 61, 61, 0.08);
    --shadow-medium: 0 8px 24px rgba(61, 61, 61, 0.12);
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-primary: "Noto Serif SC", "SimSun", "Songti SC", serif;
    --font-secondary: "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

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

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

body {
    font-family: var(--font-secondary);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

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

ul, ol {
    list-style: none;
}

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

/* ========================================
   顶部导航栏
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: linear-gradient(to bottom, rgba(245, 241, 232, 0.98), rgba(245, 241, 232, 0.95));
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition-smooth);
}

.header.scrolled {
    background: linear-gradient(to bottom, rgba(245, 241, 232, 0.99), rgba(245, 241, 232, 0.97));
    box-shadow: var(--shadow-soft);
}

.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-img {
    width: 48px;
    height: 48px;
    object-fit: contain;
}

.logo-text {
    font-family: var(--font-primary);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
    letter-spacing: 0.1em;
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    font-family: var(--font-primary);
    font-size: 1rem;
    color: var(--color-text-primary);
    padding: 0.5rem 0;
    position: relative;
    letter-spacing: 0.05em;
}

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

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

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

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

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

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: linear-gradient(to bottom, var(--color-bg-secondary), #d4cfc4);
    padding: 4rem 2rem 2rem;
    margin-top: 4rem;
    border-top: 2px solid var(--color-accent);
}

.footer-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
}

.footer-section h3 {
    font-family: var(--font-primary);
    color: var(--color-accent);
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
    letter-spacing: 0.1em;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.footer-links a:hover {
    color: var(--color-accent);
    padding-left: 5px;
}

.footer-contact p {
    color: var(--color-text-secondary);
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
}

.footer-bottom {
    max-width: 1400px;
    margin: 3rem auto 0;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
    text-align: center;
    color: var(--color-text-light);
    font-size: 0.9rem;
}

/* ========================================
   通用组件
   ======================================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 5rem 0;
}

.section-title {
    font-family: var(--font-primary);
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--color-text-primary);
    letter-spacing: 0.15em;
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 1.1rem;
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    background-color: var(--color-accent);
    color: var(--color-white);
    font-family: var(--font-primary);
    font-size: 1rem;
    letter-spacing: 0.1em;
    border: 2px solid var(--color-accent);
    transition: var(--transition-smooth);
    cursor: pointer;
}

.btn:hover {
    background-color: transparent;
    color: var(--color-accent);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-accent);
}

.btn-outline:hover {
    background-color: var(--color-accent);
    color: var(--color-white);
}

/* ========================================
   动画效果
   ======================================== */
.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);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 992px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background-color: var(--color-bg-primary);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        transition: var(--transition-smooth);
        border-top: 1px solid var(--color-border);
    }

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

    .hamburger {
        display: flex;
    }

    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

    .header-inner {
        padding: 1rem;
    }

    .container {
        padding: 0 1rem;
    }

    .section {
        padding: 3rem 0;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .footer-inner {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 480px) {
    .logo-text {
        font-size: 1.2rem;
    }

    .btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
    }
}