/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-black: #000000;
    --color-white: #ffffff;
    --color-gray-light: #f5f5f5;
    --color-gray-medium: #888888;
    --color-gray-dark: #333333;
    --color-accent: #000000;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    color: var(--color-black);
    background-color: var(--color-white);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    transition: var(--transition);
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-black);
}

.brand-image {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.25);
    object-fit: cover;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-menu a {
    color: var(--color-gray-dark);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-black);
    transition: var(--transition);
}

.nav-menu a:hover {
    color: var(--color-black);
}

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

/* 英雄区域 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    background: linear-gradient(180deg, var(--color-white) 0%, var(--color-gray-light) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(0, 0, 0, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(0, 0, 0, 0.03) 0%, transparent 50%);
    pointer-events: none;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    animation: fadeInUp 0.8s ease-out;
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.title-line {
    display: block;
}

.title-line.highlight {
    background: linear-gradient(135deg, var(--color-black) 0%, var(--color-gray-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-gray-medium);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeInRight 0.8s ease-out 0.2s both;
}

.card-preview {
    perspective: 1000px;
}

.card {
    width: 300px;
    height: 400px;
    background: var(--color-white);
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    transform-style: preserve-3d;
    transition: var(--transition);
    animation: float 6s ease-in-out infinite;
}

.card:hover {
    transform: rotateY(5deg) rotateX(5deg);
}

.card-content {
    padding: var(--spacing-md);
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
}

.card-polaroid {
    background: linear-gradient(135deg, #8B4513 0%, #000000 100%);
    color: var(--color-white);
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background-color: var(--color-gray-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-black);
    border-color: var(--color-black);
}

.btn-secondary:hover {
    background-color: var(--color-black);
    color: var(--color-white);
}

.btn-large {
    padding: 1.25rem 3rem;
    font-size: 1.125rem;
}

.btn-icon {
    font-size: 1.25rem;
}

/* 功能区域 */
.features {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-white);
}

.section-title {
    font-size: 3rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.feature-card {
    padding: var(--spacing-md);
    border-radius: 12px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    background-color: var(--color-white);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1);
    border-color: var(--color-black);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-black);
}

.feature-description {
    color: var(--color-gray-medium);
    line-height: 1.8;
}

/* 风格展示 */
.styles {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-gray-light);
}

.styles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.style-card {
    text-align: center;
    transition: var(--transition);
}

.style-card:hover {
    transform: translateY(-8px);
}

.style-preview {
    width: 100%;
    aspect-ratio: 3/4;
    border-radius: 12px;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--color-white);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    transition: var(--transition);
    position: relative;
    border: 2px solid rgba(0, 0, 0, 0.12);
    overflow: hidden;
    background-size: cover;
}

.style-content {
    z-index: 1;
}

.style-card:hover .style-preview {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
    transform: translateY(-4px);
}

.style-signature {
    position: absolute;
    bottom: 10px;
    right: 12px;
    font-family: 'Snell Roundhand', 'Segoe Script', cursive;
    font-size: 0.95rem;
    letter-spacing: 0.5px;
    opacity: 0.8;
    color: rgba(255, 255, 255, 0.9);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.35);
    z-index: 1;
}

.style-paper .style-signature,
.style-sketch .style-signature,
.style-poster .style-signature {
    color: rgba(0, 0, 0, 0.7);
    text-shadow: none;
}

.style-polaroid {
    background: linear-gradient(135deg, #8B4513 0%, #000000 100%);
}

.style-neon {
    background: linear-gradient(135deg, #000000 0%, #6A0DAD 100%);
}

.style-paper {
    background: linear-gradient(135deg, #F5F5DC 0%, #E8E8E8 100%);
    color: var(--color-black);
}

.style-sketch {
    background: linear-gradient(135deg, #FFFFFF 0%, #F0F0F0 100%);
    color: var(--color-black);
    border: 3px dashed rgba(0, 0, 0, 0.2);
}

.style-typewriter {
    background: linear-gradient(135deg, #F7F3E9 0%, #E8E0D0 100%);
    color: var(--color-black);
}

.style-bulgari {
    background: linear-gradient(135deg, #1A1A1A 0%, #000000 100%);
}

.style-poster {
    background: linear-gradient(135deg, #FFFFFF 0%, #E5E5E5 100%);
    color: var(--color-black);
}

.style-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-black);
}

.style-desc {
    color: var(--color-gray-medium);
    font-size: 0.9rem;
}

/* 使用流程 */
.workflow {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-white);
}

.workflow-steps {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.step {
    flex: 1;
    min-width: 200px;
    max-width: 250px;
    text-align: center;
    padding: var(--spacing-md);
}

.step-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--color-black);
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto var(--spacing-sm);
}

.step-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-black);
}

.step-desc {
    color: var(--color-gray-medium);
    font-size: 0.9rem;
}

.step-arrow {
    font-size: 2rem;
    color: var(--color-gray-medium);
    font-weight: 300;
}

/* 下载区域 */
.download {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(180deg, var(--color-gray-light) 0%, var(--color-white) 100%);
    text-align: center;
}

.download-subtitle {
    font-size: 1.25rem;
    color: var(--color-gray-medium);
    margin-bottom: var(--spacing-md);
}

.download-buttons {
    margin-bottom: var(--spacing-lg);
}

.system-requirements {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(0, 0, 0, 0.1);
}

.requirements-title {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-black);
}

.requirements-list {
    list-style: none;
    color: var(--color-gray-medium);
}

.requirements-list li {
    margin-bottom: var(--spacing-xs);
}

/* 页脚 */
.footer {
    padding: var(--spacing-lg) 0;
    background-color: var(--color-black);
    color: var(--color-white);
}

.footer-content {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.footer-text {
    color: var(--color-gray-medium);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--color-gray-medium);
    font-size: 0.9rem;
}

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

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-title {
        font-size: 2.5rem;
    }

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

    .features-grid {
        grid-template-columns: 1fr;
    }

    .styles-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .workflow-steps {
        flex-direction: column;
    }

    .step-arrow {
        transform: rotate(90deg);
    }

    .nav-menu {
        gap: var(--spacing-sm);
    }

    .nav-menu a {
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .styles-grid {
        grid-template-columns: 1fr;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }
}

/* FAQ 页面样式 */
.faq-hero {
    padding-top: 100px;
    padding-bottom: var(--spacing-lg);
    background: linear-gradient(180deg, var(--color-white) 0%, var(--color-gray-light) 100%);
    text-align: left;
}

.faq-title {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-sm);
}

.faq-subtitle {
    font-size: 1.1rem;
    color: var(--color-gray-medium);
    max-width: 720px;
}

.faq {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-white);
}

.faq-section + .faq-section {
    margin-top: var(--spacing-lg);
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    padding-top: var(--spacing-lg);
}

.faq-section-title {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.faq-item + .faq-item {
    margin-top: var(--spacing-md);
}

.faq-question {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.faq-answer {
    color: var(--color-gray-medium);
    line-height: 1.8;
    font-size: 0.98rem;
}

@media (max-width: 768px) {
    .faq-title {
        font-size: 2.2rem;
    }

    .faq-section-title {
        font-size: 1.5rem;
    }
}