/* ========================================
   尧图网站开发 - 全局样式表
   潮鞋简约风：黑色 + 浅灰 + 亮橙
   ======================================== */

/* CSS Reset & 基础设置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-black: #0a0a0a;
    --color-dark-gray: #1a1a1a;
    --color-medium-gray: #2a2a2a;
    --color-light-gray: #8a8a8a;
    --color-silver: #c0c0c0;
    --color-orange: #ff6b00;
    --color-orange-hover: #ff8533;
    --color-white: #ffffff;
    --color-off-white: #f5f5f5;
    --font-primary: 'Helvetica Neue', Arial, 'Microsoft YaHei', sans-serif;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 8px 30px rgba(255, 107, 0, 0.2);
}

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

body {
    font-family: var(--font-primary);
    background-color: var(--color-black);
    color: var(--color-off-white);
    line-height: 1.6;
    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: transparent;
    transition: var(--transition-smooth);
    padding: 20px 0;
}

.header.scrolled {
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo img {
    height: 45px;
    width: auto;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: 1px;
}

.logo-text span {
    color: var(--color-orange);
}

.nav-menu {
    display: flex;
    gap: 8px;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: block;
    padding: 10px 18px;
    color: var(--color-silver);
    font-size: 14px;
    font-weight: 500;
    border-radius: 4px;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--color-orange);
    transition: var(--transition-smooth);
    transform: translateX(-50%);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-white);
    background: rgba(255, 107, 0, 0.1);
}

.nav-link:hover::before,
.nav-link.active::before {
    width: 80%;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 10px;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background: var(--color-white);
    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(5px, -5px);
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: var(--color-dark-gray);
    padding: 60px 0 30px;
    margin-top: 80px;
}

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

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    color: var(--color-white);
    font-size: 18px;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

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

.footer-section p {
    color: var(--color-light-gray);
    font-size: 14px;
    line-height: 1.8;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--color-light-gray);
    font-size: 14px;
    transition: var(--transition-smooth);
}

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

.contact-info li {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--color-light-gray);
    font-size: 14px;
    margin-bottom: 12px;
}

.footer-bottom {
    border-top: 1px solid var(--color-medium-gray);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.copyright {
    color: var(--color-light-gray);
    font-size: 13px;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--color-medium-gray);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-smooth);
}

.social-link:hover {
    background: var(--color-orange);
    transform: translateY(-3px);
}

/* ========================================
   通用组件
   ======================================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    background: var(--color-orange);
    color: var(--color-white);
    font-size: 14px;
    font-weight: 600;
    border-radius: 4px;
    border: 2px solid var(--color-orange);
    cursor: pointer;
    transition: var(--transition-smooth);
}

.btn:hover {
    background: transparent;
    color: var(--color-orange);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

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

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

.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 20px;
    text-align: center;
}

.section-subtitle {
    color: var(--color-light-gray);
    font-size: 16px;
    text-align: center;
    max-width: 600px;
    margin: 0 auto 50px;
}

.section-padding {
    padding: 80px 0;
}

/* ========================================
   动画效果
   ======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.animate-fade-in-up {
    animation: fadeInUp 0.6s ease-out forwards;
}

.animate-fade-in-left {
    animation: fadeInLeft 0.6s ease-out forwards;
}

.animate-fade-in-right {
    animation: fadeInRight 0.6s ease-out forwards;
}

.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.scroll-reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .section-title {
        font-size: 30px;
    }
}

@media (max-width: 768px) {
    .header-container {
        padding: 0 20px;
    }
    
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--color-dark-gray);
        flex-direction: column;
        padding: 30px 20px;
        transition: var(--transition-smooth);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-link {
        padding: 15px 20px;
        font-size: 16px;
    }
    
    .container,
    .footer-container {
        padding: 0 20px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 26px;
    }
    
    .section-padding {
        padding: 50px 0;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .logo-text {
        font-size: 20px;
    }
    
    .btn {
        padding: 12px 24px;
    }
}