/* 黑底白字极简风格 CSS */

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

/* 根变量 */
:root {
    --black: #000000;
    --white: #ffffff;
    --gray: #808080;
    --dark-gray: #1a1a1a;
    --light-gray: #f0f0f0;
    
    --font-primary: 'Roboto', 'Helvetica Neue', 'Arial', sans-serif;
    --font-display: 'Georgia', 'Times New Roman', serif;
    
    --transition: all 0.3s ease;
    --transition-slow: all 0.6s ease;
    
    /* 新增间距变量 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 5rem;
    --spacing-xxl: 8rem;
}

/* 基础样式 */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-weight: 100;
   
    color: var(--white);
    overflow-x: hidden;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    letter-spacing: 0.02em;
}

/* 加载动画 */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    /* transition: opacity 0.6s ease, visibility 0.6s ease; */
}

.loader.fade-out {
    opacity: 0;
    visibility: hidden;
}

.loader-logo {
    font-size: 3rem;
    font-weight: 100;
    letter-spacing: 0.8rem;
    animation: pulse 1.5s ease-in-out infinite;
    color: var(--white);
}

@keyframes pulse {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1.5rem 0;
    background-color: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.navbar.scrolled {
    background-color: rgba(0, 0, 0, 0.98);
    backdrop-filter: blur(20px);
    padding: 1rem 0;
}

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

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

.logo svg {
    transition: var(--transition);
}

.logo:hover svg {
    transform: rotate(90deg);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-menu a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 300;
    letter-spacing: 0.5px;
    position: relative;
    transition: var(--transition);
    padding: 0.25rem 0;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--white);
    transition: width 0.3s ease;
}

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

/* Hero Section */
.hero-section {
    height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.7;
}

.hero-content {
    text-align: center;
    z-index: 1;
}

.hero-title {
    font-size: clamp(3rem, 6vw, 5.5rem);
    font-weight: 100;
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
    opacity: 0;
    transform: translateY(40px);
    font-family: var(--font-primary);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.125rem;
    font-weight: 300;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 3.5rem;
    opacity: 0;
    transform: translateY(30px);
    letter-spacing: 0.5px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-btn {
    display: inline-block;
    padding: 1rem 3rem;
    border: 1px solid rgba(255, 255, 255, 0.5);
    color: var(--white);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 300;
    letter-spacing: 1px;
    transition: var(--transition);
    opacity: 0;
    transform: translateY(30px);
    position: relative;
    overflow: hidden;
}

.cta-btn:hover {
    border-color: var(--white);
    transform: translateY(-2px);
}

.cta-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background-color: var(--white);
    transition: left 0.3s ease;
    z-index: -1;
}

.cta-btn:hover::before {
    left: 0;
}

.cta-btn:hover {
    color: var(--black);
}

/* Story Section */
.story-section {
    padding: var(--spacing-xxl) 0;
    /* background-color: #0a0a0a; */
    background-color: #a89a90;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.story-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.story-image {
    opacity: 0;
    transform: scale(0.95);
}

.story-image img {
    width: 100%;
    height: auto;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 100;
    margin-bottom: 2rem;
    opacity: 0;
    transform: translateY(30px);
    font-family: var(--font-primary);
    letter-spacing: 0.03em;
}

.story-text p {
    font-size: 0.938rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    color: rgba(255, 255, 255, 0.8);
    opacity: 0;
    transform: translateY(30px);
    font-weight: 300;
}

.text-link {
    display: inline-block;
    color: var(--white);
    text-decoration: none;
    font-size: 0.875rem;
    letter-spacing: 0.05rem;
    border-bottom: 1px solid var(--white);
    transition: var(--transition);
    opacity: 0;
    transform: translateY(30px);
}

.text-link:hover {
    padding-bottom: 5px;
}

/* Contact Section */
.contact-section {
    min-height: 60vh;
    background-color: var(--black);
    position: relative;
    display: flex;
    align-items: center;
}

.contact-bg {
    /* position: absolute;
    top: 0;
    left: 0;
    width: 50%;
    height: 100%; */
    border-right: 1px solid white;
    /* background-color: var(--dark-gray); */
}

.contact-content {
    display: flex;
    justify-content: flex-end;
    width: 100%;
}

.contact-info {
    text-align: left;
}

.contact-logo {
    font-size: 2.5rem;
    font-weight: 100;
    margin-bottom: 3rem;
    letter-spacing: 0.05rem;
}

.contact-info h3 {
    font-size: 1.25rem;
    font-weight: 100;
    margin-bottom: 2rem;
    letter-spacing: 0.03em;
}

.contact-info p {
    font-size: 1.013rem;
    line-height: 1.8;
    margin-bottom: 1rem;
    color: rgba(255, 255, 255, 0.8);
    font-weight: 300;
}

/* Footer */
.footer {
    padding: 2rem 0;
    text-align: center;
    /* border-top: 1px solid rgba(255, 255, 255, 0.1); */
    border-top: 1px solid white;
}

.footer-content p {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.5);
}

/* 动画类 */
.fade-up {
    animation: fadeUp 1s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

.fade-up-delay {
    animation: fadeUp 1s cubic-bezier(0.25, 0.46, 0.45, 0.94) 0.15s forwards;
}

.fade-up-delay-2 {
    animation: fadeUp 1s cubic-bezier(0.25, 0.46, 0.45, 0.94) 0.3s forwards;
}

.fade-up-delay-3 {
    animation: fadeUp 1s cubic-bezier(0.25, 0.46, 0.45, 0.94) 0.45s forwards;
}

.fade-in {
    animation: fadeIn 1.2s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* 新增淡入动画 */
@keyframes fadeInSlow {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* 滚动触发动画 */
.scroll-fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition-slow);
}

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

/* 移动端菜单按钮 */
.mobile-menu-toggle {
    display: none;
    cursor: pointer;
    z-index: 1001;
}

.mobile-menu-toggle span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--white);
    margin: 5px 0;
    transition: var(--transition);
}

/* 移动端菜单 */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    height: 100vh;
    background-color: var(--black);
    z-index: 999;
    transition: right 0.3s ease;
    display: none;
}

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

.mobile-menu-content {
    padding: 100px 40px;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.mobile-menu-content ul {
    list-style: none;
}

.mobile-menu-content li {
    margin-bottom: 30px;
}

.mobile-menu-content a {
    color: var(--white);
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: 300;
    letter-spacing: 1px;
    transition: var(--transition);
}

.mobile-menu-content a:hover {
    color: var(--gray);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .mobile-menu {
        display: block;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .story-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .contact-bg {
        width: 100%;
        opacity: 0.3;
    }
    
    .contact-info {
        text-align: center;
    }
}