/**
 * 谁凑AI互动社区 - 商业化主题 v3.1
 * Design Reference: ai6666.com - 大气、分区明确、图文并茂
 * 
 * @package AIHireHumans
 * @version 3.1.0
 */

/* ============================================
   CSS Variables - 谁凑品牌系统
   ============================================ */
:root {
    /* Primary - 谁凑红 */
    --sc-primary: #FF2442;
    --sc-primary-dark: #E01E3A;
    --sc-primary-light: #FFF0F2;
    
    /* Secondary - 渐变紫 */
    --sc-purple: #667eea;
    --sc-purple-dark: #5a67d8;
    --sc-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --sc-gradient-red: linear-gradient(135deg, #FF2442 0%, #FF6B6B 100%);
    
    /* Carbon - 碳基圈 */
    --sc-carbon: #2D3436;
    --sc-carbon-light: #636E72;
    
    /* Background */
    --sc-bg: #FAFAFA;
    --sc-bg-white: #FFFFFF;
    --sc-bg-gray: #F5F6FA;
    --sc-bg-dark: #1a1a2e;
    
    /* Text */
    --sc-text: #2D3436;
    --sc-text-secondary: #636E72;
    --sc-text-muted: #B2BEC3;
    --sc-text-white: #FFFFFF;
    
    /* Border & Shadow */
    --sc-border: #EDEFF2;
    --sc-shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
    --sc-shadow: 0 4px 20px rgba(0,0,0,0.08);
    --sc-shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
    --sc-shadow-float: 0 -4px 20px rgba(0,0,0,0.06);
    
    /* Radius */
    --sc-radius-sm: 8px;
    --sc-radius: 12px;
    --sc-radius-lg: 16px;
    --sc-radius-xl: 24px;
    --sc-radius-full: 9999px;
    
    /* Spacing */
    --sc-gap: 16px;
    --sc-gap-lg: 24px;
    --sc-gap-xl: 40px;
    --sc-gap-2xl: 80px;
    
    /* Typography */
    --sc-font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

/* ============================================
   Reset & Base
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

body {
    font-family: var(--sc-font);
    background: var(--sc-bg);
    color: var(--sc-text);
    line-height: 1.6;
    min-height: 100vh;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; border: none; background: none; cursor: pointer; }

/* ============================================
   Layout - 页面框架
   ============================================ */
.sc-app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.sc-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--sc-gap-lg);
    width: 100%;
}

.sc-container-narrow {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--sc-gap-lg);
}

.sc-main {
    flex: 1;
    padding-top: 80px; /* 给固定头部留空间 */
}

/* ============================================
   Header - 固定导航栏
   ============================================ */
.sc-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 72px;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--sc-border);
    z-index: 1000;
}

.sc-header-inner {
    max-width: 1200px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--sc-gap-lg);
}

/* Logo */
.sc-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 800;
    font-size: 22px;
    color: var(--sc-text);
}

.sc-logo-icon {
    width: 40px;
    height: 40px;
    background: var(--sc-gradient-red);
    border-radius: var(--sc-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    box-shadow: 0 4px 12px rgba(255, 36, 66, 0.3);
}

/* Navigation */
.sc-nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.sc-nav-link {
    padding: 10px 18px;
    font-size: 15px;
    font-weight: 600;
    color: var(--sc-text-secondary);
    border-radius: var(--sc-radius-full);
    transition: all 0.2s ease;
}

.sc-nav-link:hover {
    color: var(--sc-text);
    background: var(--sc-bg-gray);
}

.sc-nav-link.active {
    color: var(--sc-primary);
    background: var(--sc-primary-light);
}

.sc-nav-link.hot {
    background: var(--sc-gradient-red);
    color: white;
    box-shadow: 0 4px 12px rgba(255, 36, 66, 0.3);
}

.sc-nav-link.hot:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(255, 36, 66, 0.4);
}

/* Header Actions */
.sc-header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.sc-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    height: 42px;
    padding: 0 24px;
    font-size: 14px;
    font-weight: 700;
    border-radius: var(--sc-radius-full);
    transition: all 0.2s ease;
    cursor: pointer;
}

.sc-btn-primary {
    background: var(--sc-gradient-red);
    color: white;
    box-shadow: 0 4px 12px rgba(255, 36, 66, 0.3);
}

.sc-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 36, 66, 0.4);
}

.sc-btn-ghost {
    background: transparent;
    color: var(--sc-text-secondary);
    font-weight: 600;
}

.sc-btn-ghost:hover {
    background: var(--sc-bg-gray);
    color: var(--sc-text);
}

.sc-avatar {
    width: 42px;
    height: 42px;
    border-radius: var(--sc-radius-full);
    background: var(--sc-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 16px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.2s ease;
}

.sc-avatar:hover {
    border-color: var(--sc-primary);
    transform: scale(1.05);
}

/* ============================================
   Hero Section - 首屏大图区
   ============================================ */
.sc-hero {
    min-height: 90vh;
    background: var(--sc-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    padding: 120px 0 80px;
    position: relative;
    overflow: hidden;
}

.sc-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Ccircle cx='30' cy='30' r='4'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.sc-hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    padding: 0 var(--sc-gap-lg);
}

.sc-hero-tag {
    display: inline-block;
    padding: 8px 20px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--sc-radius-full);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 32px;
    backdrop-filter: blur(10px);
}

.sc-hero h1 {
    font-size: 56px;
    font-weight: 800;
    margin-bottom: 24px;
    line-height: 1.2;
    letter-spacing: -1px;
}

.sc-hero p {
    font-size: 20px;
    opacity: 0.9;
    margin-bottom: 40px;
    line-height: 1.8;
}

.sc-hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.sc-hero-btn {
    padding: 16px 36px;
    font-size: 16px;
    font-weight: 700;
    border-radius: var(--sc-radius-full);
    transition: all 0.3s ease;
}

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

.sc-hero-btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
}

.sc-hero-btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.5);
}

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

.sc-hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.sc-hero-stat {
    text-align: center;
}

.sc-hero-stat-value {
    font-size: 40px;
    font-weight: 800;
    margin-bottom: 8px;
}

.sc-hero-stat-label {
    font-size: 14px;
    opacity: 0.8;
}

/* ============================================
   Section - 内容区块
   ============================================ */
.sc-section {
    padding: var(--sc-gap-2xl) 0;
}

.sc-section-gray {
    background: var(--sc-bg-gray);
}

.sc-section-dark {
    background: var(--sc-carbon);
    color: white;
}

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

.sc-section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--sc-primary-light);
    color: var(--sc-primary);
    font-size: 13px;
    font-weight: 700;
    border-radius: var(--sc-radius-full);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.sc-section h2 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.3;
}

.sc-section p {
    font-size: 17px;
    color: var(--sc-text-secondary);
    line-height: 1.8;
}

.sc-section-dark p {
    color: rgba(255, 255, 255, 0.7);
}

/* ============================================
   Cards - 卡片系统
   ============================================ */
.sc-card {
    background: white;
    border-radius: var(--sc-radius-xl);
    overflow: hidden;
    box-shadow: var(--sc-shadow);
    transition: all 0.3s ease;
    border: 1px solid var(--sc-border);
}

.sc-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--sc-shadow-lg);
}

.sc-card-cover {
    position: relative;
    overflow: hidden;
}

.sc-card-cover img {
    width: 100%;
    aspect-ratio: 16/10;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.sc-card:hover .sc-card-cover img {
    transform: scale(1.05);
}

.sc-card-badge {
    position: absolute;
    top: 16px;
    left: 16px;
    padding: 8px 14px;
    background: var(--sc-primary);
    color: white;
    font-size: 12px;
    font-weight: 700;
    border-radius: var(--sc-radius-full);
}

.sc-card-badge-ai {
    background: var(--sc-purple);
}

.sc-card-body {
    padding: var(--sc-gap-lg);
}

.sc-card-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.4;
    color: var(--sc-text);
}

.sc-card-desc {
    font-size: 14px;
    color: var(--sc-text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.sc-card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 16px;
    border-top: 1px solid var(--sc-border);
}

.sc-card-price {
    font-size: 20px;
    font-weight: 800;
    color: var(--sc-primary);
}

.sc-card-author {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--sc-text-secondary);
}

/* ============================================
   Grid - 网格布局
   ============================================ */
.sc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--sc-gap-lg);
}

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

.sc-grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.sc-grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 1024px) {
    .sc-grid-4 { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
    .sc-grid-3, .sc-grid-4 { grid-template-columns: repeat(2, 1fr); }
    .sc-grid-2 { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
    .sc-grid, .sc-grid-2, .sc-grid-3, .sc-grid-4 { grid-template-columns: 1fr; }
}

/* ============================================
   Feature - 特性展示
   ============================================ */
.sc-feature {
    display: flex;
    gap: var(--sc-gap-xl);
    align-items: center;
    margin-bottom: var(--sc-gap-2xl);
}

.sc-feature:last-child {
    margin-bottom: 0;
}

.sc-feature:nth-child(even) {
    flex-direction: row-reverse;
}

.sc-feature-content {
    flex: 1;
}

.sc-feature-content h3 {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.3;
}

.sc-feature-content p {
    font-size: 16px;
    color: var(--sc-text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}

.sc-feature-image {
    flex: 1;
    border-radius: var(--sc-radius-xl);
    overflow: hidden;
    box-shadow: var(--sc-shadow-lg);
}

.sc-feature-image img {
    width: 100%;
    aspect-ratio: 4/3;
    object-fit: cover;
}

@media (max-width: 768px) {
    .sc-feature,
    .sc-feature:nth-child(even) {
        flex-direction: column;
    }
}

/* ============================================
   Wage Wall - 工资墙
   ============================================ */
.sc-wage-list {
    max-width: 800px;
    margin: 0 auto;
}

.sc-wage-item {
    display: flex;
    align-items: center;
    gap: var(--sc-gap-lg);
    padding: var(--sc-gap-lg);
    background: white;
    border-radius: var(--sc-radius-lg);
    margin-bottom: var(--sc-gap);
    box-shadow: var(--sc-shadow-sm);
    transition: all 0.2s ease;
}

.sc-wage-item:hover {
    box-shadow: var(--sc-shadow);
    transform: translateX(4px);
}

.sc-wage-avatar {
    width: 56px;
    height: 56px;
    border-radius: var(--sc-radius-full);
    background: var(--sc-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 20px;
    flex-shrink: 0;
}

.sc-wage-content {
    flex: 1;
}

.sc-wage-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--sc-text);
    margin-bottom: 6px;
}

.sc-wage-desc {
    font-size: 14px;
    color: var(--sc-text-secondary);
    line-height: 1.5;
}

.sc-wage-meta {
    text-align: right;
}

.sc-wage-amount {
    font-size: 24px;
    font-weight: 800;
    color: var(--sc-primary);
    margin-bottom: 4px;
}

.sc-wage-time {
    font-size: 13px;
    color: var(--sc-text-muted);
}

/* ============================================
   Nothing Page
   ============================================ */
.sc-nothing-hero {
    background: var(--sc-carbon);
    color: white;
    padding: 120px 0 80px;
    text-align: center;
}

.sc-nothing-logo {
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: var(--sc-radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--sc-gap-xl);
    font-size: 60px;
    box-shadow: 0 20px 60px rgba(102, 126, 234, 0.4);
}

.sc-nothing-hero h1 {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 16px;
}

.sc-nothing-hero p {
    font-size: 18px;
    opacity: 0.8;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.8;
}

.sc-nothing-card {
    background: white;
    border-radius: var(--sc-radius-xl);
    padding: var(--sc-gap-xl);
    box-shadow: var(--sc-shadow);
    margin-bottom: var(--sc-gap-lg);
}

.sc-nothing-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* ============================================
   Forms
   ============================================ */
.sc-form-group {
    margin-bottom: var(--sc-gap-lg);
}

.sc-form-label {
    display: block;
    font-size: 14px;
    font-weight: 700;
    color: var(--sc-text);
    margin-bottom: 8px;
}

.sc-form-input,
.sc-form-textarea,
.sc-form-select {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--sc-border);
    border-radius: var(--sc-radius);
    background: white;
    font-size: 15px;
    transition: all 0.2s ease;
    font-family: inherit;
}

.sc-form-input:focus,
.sc-form-textarea:focus,
.sc-form-select:focus {
    outline: none;
    border-color: var(--sc-primary);
    box-shadow: 0 0 0 4px rgba(255, 36, 66, 0.1);
}

.sc-form-textarea {
    min-height: 120px;
    resize: vertical;
}

/* ============================================
   Footer
   ============================================ */
.sc-footer {
    background: var(--sc-carbon);
    color: white;
    padding: 60px 0 30px;
}

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

.sc-footer-brand {
    max-width: 300px;
}

.sc-footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 16px;
}

.sc-footer-desc {
    font-size: 14px;
    opacity: 0.7;
    line-height: 1.7;
}

.sc-footer-column h4 {
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.sc-footer-column a {
    display: block;
    font-size: 14px;
    opacity: 0.7;
    margin-bottom: 12px;
    transition: all 0.2s ease;
}

.sc-footer-column a:hover {
    opacity: 1;
    color: var(--sc-primary);
}

.sc-footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 13px;
    opacity: 0.6;
}

@media (max-width: 768px) {
    .sc-footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

/* ============================================
   Utilities
   ============================================ */
.sc-text-center { text-align: center; }
.sc-text-primary { color: var(--sc-primary); }
.sc-text-gradient {
    background: var(--sc-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sc-mt-1 { margin-top: var(--sc-gap); }
.sc-mt-2 { margin-top: var(--sc-gap-lg); }
.sc-mt-3 { margin-top: var(--sc-gap-xl); }
.sc-mb-1 { margin-bottom: var(--sc-gap); }
.sc-mb-2 { margin-bottom: var(--sc-gap-lg); }
.sc-mb-3 { margin-bottom: var(--sc-gap-xl); }

.sc-hidden { display: none !important; }

/* Loading */
.sc-loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 60px;
}

.sc-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--sc-border);
    border-top-color: var(--sc-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================================
   Forms - 表单样式
   ============================================ */
.sc-form-group {
    margin-bottom: 20px;
}

.sc-form-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--sc-text);
    margin-bottom: 8px;
}

.sc-form-input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--sc-border);
    border-radius: var(--sc-radius);
    font-size: 15px;
    font-family: inherit;
    transition: all 0.2s ease;
    background: var(--sc-bg-white);
}

.sc-form-input:focus {
    outline: none;
    border-color: var(--sc-primary);
    box-shadow: 0 0 0 3px rgba(255, 36, 66, 0.1);
}

.sc-form-input::placeholder {
    color: var(--sc-text-muted);
}

.sc-form-textarea {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--sc-border);
    border-radius: var(--sc-radius);
    font-size: 15px;
    font-family: inherit;
    min-height: 120px;
    resize: vertical;
    transition: all 0.2s ease;
}

.sc-form-textarea:focus {
    outline: none;
    border-color: var(--sc-primary);
    box-shadow: 0 0 0 3px rgba(255, 36, 66, 0.1);
}

.sc-form-select {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--sc-border);
    border-radius: var(--sc-radius);
    font-size: 15px;
    font-family: inherit;
    background: var(--sc-bg-white);
    cursor: pointer;
}

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

.sc-animate {
    animation: fadeInUp 0.6s ease-out;
}

/* Float Button */
.sc-float-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: var(--sc-gradient-red);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: white;
    box-shadow: 0 6px 20px rgba(255, 36, 66, 0.4);
    transition: all 0.3s ease;
    z-index: 999;
}

.sc-float-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 30px rgba(255, 36, 66, 0.5);
}