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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: #fafafa;
    color: #1a1a1a;
    line-height: 1.6;
}

/* 首页 */
.home-page {
    background: #fff;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    max-width: 900px;
    margin: 0 auto;
}

.logo {
    font-size: 20px;
    font-weight: 700;
    color: #1a1a1a;
    text-decoration: none;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav-links a {
    color: #666;
    text-decoration: none;
    font-size: 14px;
}

.nav-btn {
    background: #1a1a1a;
    color: #fff !important;
    padding: 10px 20px;
    border-radius: 8px;
}

.hero {
    text-align: center;
    padding: 80px 24px 60px;
    max-width: 600px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 42px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.hero p {
    font-size: 18px;
    color: #666;
    margin-bottom: 32px;
}

.cta-btn {
    display: inline-block;
    background: #1a1a1a;
    color: #fff;
    padding: 16px 32px;
    border-radius: 10px;
    text-decoration: none;
    font-size: 16px;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s;
}

.cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.hint {
    margin-top: 16px;
    font-size: 13px;
    color: #999;
}

/* 功能区 */
.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    padding: 60px 24px;
    max-width: 900px;
    margin: 0 auto;
}

.feature {
    text-align: center;
    padding: 24px;
}

.feature-icon {
    font-size: 32px;
    margin-bottom: 16px;
}

.feature h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.feature p {
    font-size: 14px;
    color: #666;
}

/* 使用场景 */
.use-cases {
    background: #f5f5f5;
    padding: 60px 24px;
    text-align: center;
}

.use-cases h2 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 32px;
}

.cases {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    max-width: 600px;
    margin: 0 auto;
}

.case {
    background: #fff;
    padding: 20px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.case-emoji {
    font-size: 24px;
}

.case-text {
    font-size: 14px;
    color: #333;
}

/* CTA区域 */
.cta-section {
    text-align: center;
    padding: 80px 24px;
}

.cta-section h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
}

.cta-section p {
    color: #666;
    margin-bottom: 24px;
}

/* 页脚 */
.footer-home {
    text-align: center;
    padding: 40px 24px;
    border-top: 1px solid #eee;
    color: #999;
    font-size: 13px;
}

/* ===== 名片展示页 ===== */
body:not(.home-page) {
    background: #f0f0f0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 400px;
}

.card {
    background: #fff;
    border-radius: 20px;
    padding: 36px 24px;
    text-align: center;
}

.avatar-wrapper {
    width: 88px;
    height: 88px;
    margin: 0 auto 16px;
    border-radius: 50%;
    overflow: hidden;
    background: #eee;
}

.avatar {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.nickname {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 4px;
}

.bio {
    font-size: 14px;
    color: #666;
    margin-bottom: 24px;
}

.links {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 24px;
}

.link-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: #f5f5f5;
    border-radius: 12px;
    text-decoration: none;
    color: #1a1a1a;
    font-weight: 500;
    font-size: 15px;
    transition: background 0.2s;
}

.link-item:hover {
    background: #eee;
}

.link-icon { font-size: 18px; }

.footer {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid #eee;
}

.footer a {
    color: #999;
    font-size: 12px;
    text-decoration: none;
}

/* 加载 & 错误 */
.loading, .error {
    text-align: center;
    padding: 40px;
    color: #666;
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid #eee;
    border-top-color: #1a1a1a;
    border-radius: 50%;
    margin: 0 auto 16px;
    animation: spin 1s linear infinite;
}

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

.error a {
    color: #1a1a1a;
    text-decoration: underline;
}

/* ===== 登录/注册 ===== */
.auth-card {
    background: #fff;
    border-radius: 20px;
    padding: 36px 28px;
}

.auth-card h1 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 4px;
    text-align: center;
}

.auth-desc {
    text-align: center;
    color: #666;
    margin-bottom: 28px;
    font-size: 14px;
}

.form-group { margin-bottom: 14px; }

.form-group label {
    display: block;
    font-size: 13px;
    color: #666;
    margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid #ddd;
    border-radius: 10px;
    font-size: 15px;
    background: #fafafa;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #1a1a1a;
    background: #fff;
}

.btn-primary {
    width: 100%;
    padding: 14px;
    background: #1a1a1a;
    color: #fff;
    border: none;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 8px;
}

.btn-primary:hover {
    background: #333;
}

.btn-secondary {
    padding: 10px 16px;
    background: #f5f5f5;
    color: #333;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
}

.btn-danger {
    padding: 8px 14px;
    background: #ff4757;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 13px;
    cursor: pointer;
}

.auth-switch {
    text-align: center;
    margin-top: 20px;
    color: #666;
    font-size: 14px;
}

.auth-switch a {
    color: #1a1a1a;
    text-decoration: none;
    font-weight: 600;
}

/* ===== 管理后台 ===== */
.admin-container {
    width: 100%;
    max-width: 700px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    margin-bottom: 20px;
}

.admin-header h1 {
    font-size: 20px;
    font-weight: 700;
    color: #1a1a1a;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
    color: #666;
    font-size: 14px;
}

.header-right a {
    color: #1a1a1a;
    text-decoration: none;
}

.admin-main {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.card-section,
.links-section,
.share-section {
    background: #fff;
    border-radius: 16px;
    padding: 24px;
}

.card-section h2,
.links-section h2,
.share-section h2 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    color: #1a1a1a;
}

.add-link-form {
    display: grid;
    grid-template-columns: 1fr 1fr auto auto;
    gap: 10px;
    margin-bottom: 16px;
}

.add-link-form input,
.add-link-form select {
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
    background: #fafafa;
}

.links-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.link-item-admin {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 14px;
    background: #f5f5f5;
    border-radius: 10px;
}

.link-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.link-type { font-size: 16px; }
.link-url { color: #999; font-size: 12px; }

.share-url {
    display: flex;
    gap: 10px;
    margin-top: 12px;
}

.share-url input {
    flex: 1;
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
    background: #fafafa;
}

/* ===== 响应式 ===== */
@media (max-width: 600px) {
    .nav {
        padding: 16px;
    }
    
    .hero {
        padding: 60px 20px 40px;
    }
    
    .hero h1 {
        font-size: 32px;
    }
    
    .features {
        grid-template-columns: 1fr;
        gap: 0;
        padding: 40px 20px;
    }
    
    .feature {
        padding: 16px 0;
        border-bottom: 1px solid #eee;
    }
    
    .feature:last-child {
        border-bottom: none;
    }
    
    .cases {
        grid-template-columns: 1fr;
    }
    
    .admin-container {
        padding: 16px;
    }
    
    .admin-header {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
    
    .header-right {
        width: 100%;
        justify-content: center;
    }
    
    .card-section,
    .links-section,
    .share-section {
        padding: 20px;
    }
    
    .add-link-form {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .add-link-form input,
    .add-link-form select,
    .add-link-form button {
        width: 100%;
    }
    
    .link-item-admin {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }
    
    .link-item-admin .btn-danger {
        width: 100%;
        text-align: center;
    }
    
    .share-url {
        flex-direction: column;
    }
}