/* ============================================
   配色大师落地页样式
   设计风格: Minimal & Direct + Flat Design
   主色调: 紫色系 (#A855F7)
   ============================================ */

/* === CSS 变量 === */
:root {
    /* 主色系 - 紫色系配色工具主题 */
    --color-primary: #A855F7;
    --color-primary-dark: #9333EA;
    --color-primary-light: #C084FC;

    /* 辅助色 */
    --color-secondary: #F97316;
    --color-secondary-dark: #EA580C;

    /* 背景色 */
    --color-bg: #FFFFFF;
    --color-bg-alt: #FAFAFA;
    --color-bg-elevated: #FFFFFF;

    /* 文字色 */
    --color-text-primary: #1A1A2E;
    --color-text-secondary: #4A5568;
    --color-text-muted: #A0AEC0;

    /* 边框色 */
    --color-border: #E2E8F0;
    --color-border-light: #F7FAFC;

    /* 阴影 */
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 12px 0 rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 25px 0 rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 40px 0 rgb(0 0 0 / 0.12);

    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    /* 容器宽度 */
    --container-max-width: 1200px;
}

/* === 基础重置 === */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Open Sans', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* === 排版 === */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', 'Noto Sans SC', sans-serif;
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-text-primary);
}

p {
    color: var(--color-text-secondary);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease;
}

/* === 容器 === */
.nav-container,
.hero-container,
.section-container,
.download-container,
.footer-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* === 导航栏 === */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border-light);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    flex-shrink: 0;
}

.logo-text {
    font-family: 'Poppins', sans-serif;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-primary);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
}

.nav-link:hover {
    color: var(--color-primary);
}

/* === Hero 区域 === */
.hero {
    padding-top: 64px;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(180deg, var(--color-bg-alt) 0%, var(--color-bg) 100%);
    position: relative;
    overflow: hidden;
}

/* 背景装饰 */
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(168, 85, 247, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.06) 0%, transparent 70%);
    pointer-events: none;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    padding-top: var(--spacing-3xl);
    padding-bottom: var(--spacing-3xl);
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 540px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: rgba(168, 85, 247, 0.1);
    border: 1px solid rgba(168, 85, 247, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 3.75rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-md);
}

.title-gradient {
    background: linear-gradient(135deg, #A855F7 0%, #6366F1 50%, #3B82F6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 480px;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* === 按钮样式 === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.875rem 1.75rem;
    font-family: inherit;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    box-shadow: 0 4px 14px rgba(168, 85, 247, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(168, 85, 247, 0.4);
}

.btn-secondary {
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background-color: var(--color-bg-alt);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* === Hero 视觉 - 配色卡片 === */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.color-palette-preview {
    display: flex;
    gap: 8px;
    padding: 24px;
    background: var(--color-bg);
    border-radius: 24px;
    box-shadow: var(--shadow-xl);
    animation: float 6s ease-in-out infinite;
}

.palette-color {
    width: 60px;
    height: 200px;
    border-radius: 12px;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 12px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.palette-color:hover {
    transform: translateY(-8px) scale(1.05);
    box-shadow: var(--shadow-lg);
}

.color-hex {
    font-size: 10px;
    font-weight: 600;
    color: white;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    opacity: 0;
    transition: opacity 0.2s ease;
}

.palette-color:hover .color-hex {
    opacity: 1;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-16px); }
}

/* === 功能区域 === */
.features {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg);
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--spacing-3xl);
}

.section-label {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
}

/* === 功能卡片网格 === */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.feature-card {
    padding: var(--spacing-xl);
    background-color: var(--color-bg-alt);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-xl);
    transition: all 0.3s ease;
    cursor: pointer;
}

.feature-card:hover {
    background-color: var(--color-bg);
    border-color: rgba(168, 85, 247, 0.3);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
}

.feature-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.feature-description {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* === 应用截图 === */
.screenshots {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg-alt);
}

.screenshots-scroll {
    display: flex;
    gap: var(--spacing-lg);
    overflow-x: auto;
    padding: var(--spacing-md) 0;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
}

.screenshots-scroll::-webkit-scrollbar {
    height: 6px;
}

.screenshots-scroll::-webkit-scrollbar-track {
    background: var(--color-border-light);
    border-radius: 3px;
}

.screenshots-scroll::-webkit-scrollbar-thumb {
    background: var(--color-primary-light);
    border-radius: 3px;
}

.screenshot-card {
    flex-shrink: 0;
    width: 280px;
    scroll-snap-align: start;
}

.screenshot-card img {
    width: 100%;
    height: 500px;
    object-fit: cover;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-sm);
}

.screenshot-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    text-align: center;
    display: block;
}

/* === 下载区域 === */
.download {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg);
}

.download-container {
    max-width: 640px;
}

.download-content {
    text-align: center;
}

.download-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: rgba(168, 85, 247, 0.1);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
}

.download-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.download-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

.download-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

.store-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--color-text-primary);
    color: white;
    border-radius: var(--radius-lg);
    transition: all 0.2s ease;
    min-width: 160px;
}

.store-btn:hover {
    background-color: #0f172a;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.store-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.store-label {
    font-size: 0.625rem;
    opacity: 0.8;
}

.store-name {
    font-size: 1rem;
    font-weight: 600;
}

.apk-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.875rem 1.75rem;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    border-radius: var(--radius-lg);
    font-weight: 600;
    transition: all 0.2s ease;
    box-shadow: 0 4px 14px rgba(168, 85, 247, 0.3);
}

.apk-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(168, 85, 247, 0.4);
}

/* === 页脚 === */
.footer {
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
    background-color: var(--color-bg-alt);
    border-top: 1px solid var(--color-border-light);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: 'Poppins', sans-serif;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-primary);
}

.footer-tagline {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
}

.footer-links {
    display: flex;
    gap: var(--spacing-2xl);
}

.footer-column h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.footer-column a {
    display: block;
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.footer-column a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border-light);
    font-size: 0.875rem;
    color: var(--color-text-muted);
    text-align: center;
}

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

    .color-palette-preview {
        transform: scale(0.9);
    }
}

@media (max-width: 768px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        padding-top: var(--spacing-2xl);
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-description {
        max-width: 100%;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero-visual {
        order: -1;
        margin-bottom: var(--spacing-xl);
    }

    .color-palette-preview {
        transform: scale(0.8);
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .footer-links {
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-lg: 1rem;
        --spacing-xl: 1.5rem;
        --spacing-2xl: 2rem;
        --spacing-3xl: 2.5rem;
    }

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

    .hero-cta {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
    }

    .download-buttons {
        flex-direction: column;
        width: 100%;
    }

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

    .color-palette-preview {
        flex-wrap: wrap;
        justify-content: center;
    }

    .palette-color {
        width: 50px;
        height: 160px;
    }
}

/* === 可访问性增强 === */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 焦点样式 */
a:focus-visible,
.btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* === 截图卡片点击效果 === */
.screenshot-card {
    cursor: pointer;
}

.screenshot-card img {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.screenshot-card:hover img {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

/* === 图片预览弹窗 === */
.image-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
}

.image-modal.active {
    display: block;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
}

.modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90vw;
    height: 90vh;
    max-width: 1200px;
    display: flex;
    flex-direction: column;
}

.modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    width: 36px;
    height: 36px;
    background: transparent;
    border: none;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.2s ease;
}

.modal-close:hover {
    opacity: 0.8;
}

.modal-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    backdrop-filter: blur(10px);
}

.modal-nav:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-50%) scale(1.1);
}

.modal-prev {
    left: -60px;
}

.modal-next {
    right: -60px;
}

.modal-image-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-image-container img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: var(--radius-lg);
}

.modal-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: var(--spacing-md);
    padding: 0 var(--spacing-md);
}

.modal-title {
    font-size: 1rem;
    font-weight: 500;
    color: white;
}

.modal-counter {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
}

/* 弹窗响应式 */
@media (max-width: 768px) {
    .modal-content {
        width: 100vw;
        height: 100vh;
        max-width: none;
    }

    .modal-close {
        top: var(--spacing-md);
        right: var(--spacing-md);
        z-index: 10;
    }

    .modal-prev {
        left: var(--spacing-sm);
    }

    .modal-next {
        right: var(--spacing-sm);
    }
}