/* ========================================
   思品个人设计分享 - 主样式表
   ======================================== */

/* CSS 变量定义 */
:root {
    /* 主色调 */
    --primary-color: #1a1a1a;
    --primary-light: #333333;
    --accent-color: #ff6b6b;
    --accent-hover: #ff5252;
    
    /* 中性色 */
    --white: #ffffff;
    --gray-50: #fafafa;
    --gray-100: #f5f5f5;
    --gray-200: #e5e5e5;
    --gray-300: #d4d4d4;
    --gray-400: #a3a3a3;
    --gray-500: #737373;
    --gray-600: #525252;
    --gray-700: #404040;
    --gray-800: #262626;
    --gray-900: #171717;
    
    /* 功能色 */
    --bg-primary: #ffffff;
    --bg-secondary: #fafafa;
    --bg-dark: #0a0a0a;
    --text-primary: #1a1a1a;
    --text-secondary: #525252;
    --text-light: #737373;
    --text-white: #ffffff;
    
    /* 字体 */
    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* 间距 */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    --space-5xl: 8rem;
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* 过渡 */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* 容器宽度 */
    --container-max: 1280px;
    --container-padding: 1.5rem;
}

/* 重置样式 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: inherit;
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, textarea {
    font-family: inherit;
}

/* 容器 */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ========================================
   导航栏
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    transition: var(--transition-base);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary-color);
}

.logo-icon {
    color: var(--accent-color);
    font-size: 1.5rem;
}

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

.nav-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: var(--space-sm) 0;
    position: relative;
    transition: var(--transition-fast);
}

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

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

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

/* 移动端菜单按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-sm);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition-base);
}

/* ========================================
   按钮样式
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.875rem 1.75rem;
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: var(--transition-base);
    cursor: pointer;
}

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

.btn-primary:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1.5px solid var(--gray-300);
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    background: var(--gray-50);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1.5px solid var(--gray-300);
}

.btn-outline:hover {
    border-color: var(--primary-color);
    background: var(--gray-50);
}

/* ========================================
   英雄区域
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
}

.hero-background {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-background::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(255, 107, 107, 0.2) 0%, transparent 40%);
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.3) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: var(--text-white);
    padding: var(--container-padding);
    max-width: 800px;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--space-lg);
}

.title-line {
    display: block;
}

.title-line:first-child {
    font-size: 0.5em;
    font-weight: 300;
    letter-spacing: 0.5em;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
    opacity: 0.9;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2.5vw, 1.5rem);
    font-weight: 300;
    opacity: 0.9;
    margin-bottom: var(--space-2xl);
}

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

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

.hero-buttons .btn-primary:hover {
    background: var(--gray-100);
}

.hero-buttons .btn-secondary {
    border-color: rgba(255, 255, 255, 0.5);
    color: var(--white);
}

.hero-buttons .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--white);
}

.hero-scroll {
    position: absolute;
    bottom: var(--space-2xl);
    left: 50%;
    transform: translateX(-50%);
    color: var(--white);
    font-size: 0.875rem;
    opacity: 0.7;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
}

.scroll-indicator {
    width: 24px;
    height: 40px;
    border: 2px solid currentColor;
    border-radius: var(--radius-full);
    position: relative;
}

.scroll-indicator::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: currentColor;
    border-radius: var(--radius-full);
    animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: translateX(-50%) translateY(0); opacity: 1; }
    50% { transform: translateX(-50%) translateY(8px); opacity: 0.5; }
}

/* ========================================
   通用板块样式
   ======================================== */
.section {
    padding: var(--space-5xl) 0;
}

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto var(--space-3xl);
}

.section-tag {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-md);
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

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

.section-footer {
    text-align: center;
    margin-top: var(--space-3xl);
}

/* ========================================
   设计理念板块
   ======================================== */
.concepts-section {
    background: var(--bg-secondary);
}

.concepts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-xl);
}

.concept-card {
    background: var(--white);
    padding: var(--space-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
    border: 1px solid var(--gray-200);
}

.concept-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--gray-300);
}

.concept-icon {
    width: 64px;
    height: 64px;
    color: var(--accent-color);
    margin-bottom: var(--space-lg);
}

.concept-icon svg {
    width: 100%;
    height: 100%;
}

.concept-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.concept-card p {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    line-height: 1.7;
}

.concept-link {
    font-weight: 500;
    color: var(--accent-color);
    transition: var(--transition-fast);
}

.concept-link:hover {
    color: var(--accent-hover);
}

/* ========================================
   作品鉴赏板块
   ======================================== */
.gallery-filter {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--gray-100);
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--primary-color);
    color: var(--white);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-lg);
}

.gallery-item {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
}

.gallery-image {
    position: relative;
    aspect-ratio: 4/3;
    overflow: hidden;
}

.image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--white);
    transition: var(--transition-base);
}

/* 作品占位背景色 */
.brand-bg { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.brand-bg2 { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }
.ui-bg { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
.ui-bg2 { background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%); }
.graphic-bg { background: linear-gradient(135deg, #fa709a 0%, #fee140 100%); }
.product-bg { background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%); }

.gallery-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.8) 100%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: var(--space-xl);
    color: var(--white);
    opacity: 0;
    transition: var(--transition-base);
}

.gallery-item:hover .gallery-overlay {
    opacity: 1;
}

.gallery-item:hover .image-placeholder {
    transform: scale(1.05);
}

.gallery-category {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 0.25rem 0.75rem;
    background: var(--accent-color);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-sm);
    width: fit-content;
}

.gallery-overlay h3 {
    font-size: 1.375rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.gallery-overlay p {
    font-size: 0.9375rem;
    opacity: 0.8;
}

/* ========================================
   特色内容板块
   ======================================== */
.features-section {
    background: var(--bg-dark);
    color: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-2xl);
}

.feature-block {
    padding: var(--space-xl);
    border-left: 2px solid var(--accent-color);
}

.feature-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-color);
    opacity: 0.5;
    line-height: 1;
    margin-bottom: var(--space-md);
}

.feature-block h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.feature-block p {
    color: var(--gray-400);
    line-height: 1.7;
}

/* ========================================
   订阅区域
   ======================================== */
.subscribe-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--white);
    text-align: center;
}

.subscribe-content {
    max-width: 600px;
    margin: 0 auto;
}

.subscribe-content h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.subscribe-content p {
    opacity: 0.9;
    margin-bottom: var(--space-xl);
}

.subscribe-form {
    display: flex;
    gap: var(--space-md);
    max-width: 480px;
    margin: 0 auto;
}

.subscribe-form input {
    flex: 1;
    padding: 0.875rem 1.25rem;
    font-size: 0.9375rem;
    border: none;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.9);
}

.subscribe-form input::placeholder {
    color: var(--gray-500);
}

.subscribe-form .btn-primary {
    background: var(--primary-color);
    color: var(--white);
    white-space: nowrap;
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: var(--gray-900);
    color: var(--gray-400);
    padding: var(--space-4xl) 0 var(--space-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-3xl);
    margin-bottom: var(--space-3xl);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: var(--space-md);
}

.footer-brand p {
    max-width: 300px;
    line-height: 1.7;
}

.footer-column h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--white);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-lg);
}

.footer-column ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.footer-column a {
    transition: var(--transition-fast);
}

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

.footer-bottom {
    padding-top: var(--space-xl);
    border-top: 1px solid var(--gray-800);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
    font-size: 0.875rem;
}

.beian a {
    color: var(--gray-500);
    transition: var(--transition-fast);
}

.beian a:hover {
    color: var(--white);
}

/* ========================================
   页面通用样式
   ======================================== */
.page-header {
    padding: calc(72px + var(--space-4xl)) 0 var(--space-3xl);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--white);
    text-align: center;
}

.page-header h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.page-header p {
    font-size: 1.125rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

/* 内容页面样式 */
.content-section {
    padding: var(--space-4xl) 0;
}

.content-section:nth-child(even) {
    background: var(--bg-secondary);
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
}

.content-grid.reverse {
    direction: rtl;
}

.content-grid.reverse > * {
    direction: ltr;
}

.content-text h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
}

.content-text p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-md);
}

.content-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.content-image .image-placeholder {
    aspect-ratio: 4/3;
}

/* ========================================
   设计理念详情页
   ======================================== */
.concept-detail {
    padding: var(--space-4xl) 0;
}

.concept-detail:nth-child(even) {
    background: var(--bg-secondary);
}

.concept-header {
    display: flex;
    align-items: flex-start;
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

.concept-icon-large {
    width: 80px;
    height: 80px;
    color: var(--accent-color);
    flex-shrink: 0;
}

.concept-icon-large svg {
    width: 100%;
    height: 100%;
}

.concept-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.concept-header p {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

.concept-content h3 {
    font-size: 1.375rem;
    font-weight: 600;
    margin: var(--space-xl) 0 var(--space-md);
    color: var(--text-primary);
}

.concept-content p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-md);
}

.concept-content ul {
    list-style: disc;
    padding-left: var(--space-xl);
    color: var(--text-secondary);
}

.concept-content li {
    margin-bottom: var(--space-sm);
    line-height: 1.7;
}

.concept-examples {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-2xl);
}

.example-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.example-card img {
    width: 100%;
    aspect-ratio: 16/10;
    object-fit: cover;
}

.example-card h4 {
    padding: var(--space-md) var(--space-lg);
    font-weight: 600;
}

/* ========================================
   关于页面
   ======================================== */
.about-intro {
    padding: var(--space-4xl) 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-3xl);
    align-items: start;
}

.about-avatar {
    width: 100%;
    aspect-ratio: 1;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: var(--white);
}

.about-text h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--space-lg);
}

.about-text p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-md);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    margin-top: var(--space-2xl);
    padding-top: var(--space-2xl);
    border-top: 1px solid var(--gray-200);
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-color);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: var(--space-xs);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
    
    .content-grid {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }
    
    .content-grid.reverse {
        direction: ltr;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .about-avatar {
        max-width: 200px;
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    :root {
        --container-padding: 1rem;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: var(--space-xl);
        gap: var(--space-md);
        border-bottom: 1px solid var(--gray-200);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-base);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .concepts-grid {
        grid-template-columns: 1fr;
    }
    
    .gallery-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .subscribe-form {
        flex-direction: column;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .concept-header {
        flex-direction: column;
        text-align: center;
    }
    
    .concept-icon-large {
        margin: 0 auto;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
}

@media (max-width: 480px) {
    .section {
        padding: var(--space-3xl) 0;
    }
    
    .concept-card {
        padding: var(--space-xl);
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .hero-buttons .btn {
        width: 100%;
    }
}

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

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

/* 滚动显示动画 */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}