* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

:root {
    --bg-dark: #0d1117;
    --bg-card: #161b22;
    --bg-input: #21262d;
    --border: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent: #58a6ff;
    --accent-hover: #79c0ff;
    --success: #3fb950;
    --danger: #f85149;
    --warning: #d29922;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* 页面通用 */
.page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 顶部导航 */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    background: rgba(13, 17, 23, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 20px;
    font-weight: 700;
    background: linear-gradient(135deg, #58a6ff, #a371f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo.small {
    font-size: 18px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
}

.gen-count {
    background: var(--bg-input);
    padding: 4px 10px;
    border-radius: 12px;
    border: 1px solid var(--border);
}

.gen-count b {
    color: var(--success);
}

.btn-link {
    background: none;
    border: none;
    color: var(--accent);
    font-size: 14px;
    cursor: pointer;
    padding: 4px 8px;
}

.btn-back {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 16px;
    cursor: pointer;
    padding: 4px;
    min-width: 60px;
}

/* 主内容区 */
.main-content {
    flex: 1;
    padding: 20px 16px 40px;
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
}

/* 英雄区 */
.hero {
    text-align: center;
    padding: 32px 0 28px;
}

.hero h2 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 8px;
    background: linear-gradient(135deg, #e6edf3, #8b949e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 卡片 */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px 20px;
    margin-bottom: 20px;
}

/* 上传区域 */
.upload-area {
    border: 2px dashed var(--border);
    border-radius: 10px;
    padding: 32px 20px;
    text-align: center;
    cursor: pointer;
    margin-bottom: 20px;
    transition: border-color 0.2s;
    position: relative;
}

.upload-area:hover {
    border-color: var(--accent);
}

.upload-area:active {
    border-color: var(--accent-hover);
}

.upload-icon {
    font-size: 40px;
    margin-bottom: 12px;
}

.upload-tip p {
    color: var(--text-secondary);
    font-size: 14px;
}

.upload-tip .sub {
    font-size: 12px;
    margin-top: 6px;
    opacity: 0.7;
}

#preview-img {
    max-width: 100%;
    max-height: 300px;
    border-radius: 8px;
    object-fit: cover;
}

/* 表单 */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.input-style, .select-style, .textarea-style {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 14px;
    font-size: 15px;
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.2s;
    font-family: inherit;
    -webkit-appearance: none;
    appearance: none;
}

.input-style:focus, .select-style:focus, .textarea-style:focus {
    border-color: var(--accent);
}

.select-style {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238b949e' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
}

.select-style option {
    background: var(--bg-card);
    color: var(--text-primary);
}

.textarea-style {
    resize: vertical;
    min-height: 100px;
    line-height: 1.6;
}

/* 按钮 */
.btn-primary, .btn-generate {
    width: 100%;
    background: linear-gradient(135deg, #238636, #2ea043);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 14px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
    font-family: inherit;
}

.btn-primary:hover, .btn-generate:hover {
    opacity: 0.88;
}

.btn-generate {
    background: linear-gradient(135deg, #1f6feb, #388bfd);
    margin-top: 8px;
}

.btn-generate:disabled {
    background: var(--bg-input);
    color: var(--text-secondary);
    cursor: not-allowed;
    opacity: 1;
}

.btn-reuse {
    background: var(--bg-input);
    color: var(--accent);
    border: 1px solid var(--accent);
    border-radius: 8px;
    padding: 12px 24px;
    font-size: 14px;
    cursor: pointer;
    margin-top: 16px;
    transition: background 0.2s;
}

.btn-reuse:hover {
    background: rgba(88, 166, 255, 0.1);
}

.gen-tip {
    text-align: center;
    color: var(--text-secondary);
    font-size: 13px;
    margin-top: 12px;
}

.reg-tip {
    text-align: center;
    color: var(--text-secondary);
    font-size: 13px;
    margin-top: 16px;
}

.reg-tip b {
    color: var(--success);
}

.form-footer {
    display: flex;
    justify-content: space-between;
    margin-top: 16px;
    font-size: 13px;
}

.form-footer a {
    color: var(--accent);
    text-decoration: none;
}

/* 结果区 */
.result-area {
    margin-top: 24px;
}

.result-area h3 {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.result-box {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    text-align: center;
}

.result-box img {
    max-width: 100%;
    display: block;
}

.result-tip {
    font-size: 12px;
    color: var(--text-secondary);
    padding: 10px;
    text-align: center;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 14px;
    z-index: 9999;
    animation: toastIn 0.3s ease;
    max-width: 90vw;
    text-align: center;
}

@keyframes toastIn {
    from { opacity: 0; transform: translateX(-50%) translateY(20px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* 管理员后台 */
.admin-layout {
    min-height: 100vh;
    display: flex;
}

.admin-sidebar {
    width: 200px;
    background: var(--bg-card);
    border-right: 1px solid var(--border);
    padding: 20px 0;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.admin-sidebar h2 {
    font-size: 16px;
    padding: 0 16px 16px;
    color: var(--accent);
    border-bottom: 1px solid var(--border);
    margin-bottom: 12px;
}

.admin-nav-item {
    display: block;
    padding: 12px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    cursor: pointer;
    border-left: 3px solid transparent;
    transition: all 0.2s;
}

.admin-nav-item:hover, .admin-nav-item.active {
    color: var(--accent);
    background: rgba(88, 166, 255, 0.08);
    border-left-color: var(--accent);
}

.admin-main {
    flex: 1;
    margin-left: 200px;
    padding: 24px;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.admin-header h1 {
    font-size: 22px;
}

.admin-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 16px;
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px;
    text-align: center;
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 6px;
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.admin-table th, .admin-table td {
    text-align: left;
    padding: 12px 10px;
    border-bottom: 1px solid var(--border);
}

.admin-table th {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 12px;
    text-transform: uppercase;
}

.admin-table tr:hover td {
    background: rgba(88, 166, 255, 0.04);
}

.btn-adjust {
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
    margin: 0 2px;
}

.btn-adjust:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* 响应式 */
@media (max-width: 768px) {
    .admin-layout {
        flex-direction: column;
    }
    
    .admin-sidebar {
        width: 100%;
        height: auto;
        position: relative;
        border-right: none;
        border-bottom: 1px solid var(--border);
        display: flex;
        overflow-x: auto;
        padding: 0;
    }
    
    .admin-sidebar h2 {
        display: none;
    }
    
    .admin-nav-item {
        padding: 14px 16px;
        border-left: none;
        border-bottom: 2px solid transparent;
        white-space: nowrap;
    }
    
    .admin-nav-item:hover, .admin-nav-item.active {
        border-left: none;
        border-bottom-color: var(--accent);
    }
    
    .admin-main {
        margin-left: 0;
        padding: 16px;
    }
    
    .admin-header h1 {
        font-size: 18px;
    }
    
    .stat-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .admin-table {
        font-size: 13px;
    }
    
    .admin-table th, .admin-table td {
        padding: 10px 6px;
    }
}

@media (max-width: 480px) {
    .hero h2 {
        font-size: 22px;
    }
    
    .card {
        padding: 18px 16px;
    }
    
    .stat-grid {
        grid-template-columns: 1fr;
    }
}