*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root { --primary: #1a73e8; --primary-dark: #1557b0; --primary-light: #e8f0fe; --gray-bg: #f5f7fa; --gray-border: #e0e0e0; --text: #333; --text-light: #666; --shadow: 0 2px 12px rgba(0,0,0,0.08); --radius: 10px; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif; background: var(--gray-bg); color: var(--text); line-height: 1.6; min-height: 100vh; display: flex; flex-direction: column; }
a { color: var(--primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--primary-dark); }

/* 淡入动画 */
@keyframes fadeIn { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
.page-content { animation: fadeIn .45s ease; flex: 1; }

/* 导航 */
.navbar { background: linear-gradient(135deg, var(--primary), #4285f4); color: #fff; padding: 0 20px; position: sticky; top: 0; z-index: 100; box-shadow: 0 2px 8px rgba(0,0,0,.15); }
.nav-inner { max-width: 1100px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; height: 60px; }
.nav-logo { font-size: 1.25rem; font-weight: 700; color: #fff; letter-spacing: 1px; }
.nav-links { display: flex; gap: 6px; align-items: center; }
.nav-links a { color: rgba(255,255,255,.85); padding: 8px 14px; border-radius: 6px; font-size: .95rem; transition: background .2s, color .2s; }
.nav-links a:hover, .nav-links a.active { background: rgba(255,255,255,.18); color: #fff; }
.hamburger { display: none; background: none; border: none; color: #fff; font-size: 1.5rem; cursor: pointer; }

/* 容器 */
.container { max-width: 1100px; margin: 30px auto; padding: 0 20px; }

/* 卡片 */
.card { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); padding: 28px; margin-bottom: 20px; transition: transform .2s, box-shadow .2s; }
.card:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,.1); }
.card h3 { margin-bottom: 8px; font-size: 1.15rem; }
.card .meta { color: var(--text-light); font-size: .85rem; margin-bottom: 6px; }
.card .category-tag { display: inline-block; background: var(--primary-light); color: var(--primary); padding: 2px 10px; border-radius: 20px; font-size: .8rem; margin-right: 8px; }
.card .content-preview { color: var(--text-light); font-size: .93rem; margin-top: 6px; }

/* 表单 */
.form-wrap { max-width: 480px; margin: 40px auto; }
.form-card { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); padding: 36px; }
.form-card h2 { text-align: center; margin-bottom: 24px; color: var(--primary); }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 500; font-size: .95rem; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 10px 14px; border: 2px solid var(--gray-border); border-radius: 8px; font-size: .95rem; transition: border-color .25s, box-shadow .25s; outline: none; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26,115,232,.15); }
.form-group textarea { resize: vertical; min-height: 120px; }

/* 按钮 */
.btn { display: inline-block; padding: 10px 28px; border: none; border-radius: 8px; font-size: 1rem; font-weight: 600; cursor: pointer; transition: background .25s, transform .15s, box-shadow .25s; }
.btn-primary { background: linear-gradient(135deg, var(--primary), #4285f4); color: #fff; }
.btn-primary:hover { background: linear-gradient(135deg, var(--primary-dark), var(--primary)); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(26,115,232,.3); }
.btn-block { display: block; width: 100%; text-align: center; }
.btn-sm { padding: 6px 16px; font-size: .88rem; }
.btn-outline { background: transparent; border: 2px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }

/* 提示 */
.alert { padding: 12px 18px; border-radius: 8px; margin-bottom: 18px; font-size: .93rem; }
.alert-success { background: #e6f9e6; color: #1b7a1b; }
.alert-error { background: #fde8e8; color: #c0392b; }
.alert-info { background: var(--primary-light); color: var(--primary); }

/* 表格 */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
table th, table td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--gray-border); }
table th { background: var(--primary-light); color: var(--primary); font-weight: 600; }
table tr:hover { background: #fafbfc; }

/* 状态标签 */
.status { display: inline-block; padding: 3px 12px; border-radius: 20px; font-size: .82rem; font-weight: 500; }
.status-pending { background: #fff3cd; color: #856404; }
.status-approved { background: #d4edda; color: #155724; }
.status-rejected { background: #f8d7da; color: #721c24; }

/* 充值选项 */
.recharge-options { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 14px; margin: 20px 0; }
.recharge-option { border: 2px solid var(--gray-border); border-radius: var(--radius); padding: 20px; text-align: center; cursor: pointer; transition: border-color .2s, transform .2s, box-shadow .2s; }
.recharge-option:hover, .recharge-option.selected { border-color: var(--primary); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(26,115,232,.15); }
.recharge-option .amount { font-size: 1.5rem; font-weight: 700; color: var(--primary); }
.recharge-option .label { font-size: .85rem; color: var(--text-light); margin-top: 4px; }

/* 页脚 */
.footer { background: #fff; border-top: 1px solid var(--gray-border); text-align: center; padding: 20px; color: var(--text-light); font-size: .85rem; margin-top: auto; }

/* 协议弹窗 */
.modal-overlay { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,.45); z-index: 200; justify-content: center; align-items: center; }
.modal-overlay.show { display: flex; }
.modal { background: #fff; border-radius: var(--radius); max-width: 600px; width: 90%; max-height: 80vh; overflow-y: auto; padding: 30px; animation: fadeIn .3s ease; }
.modal h2 { margin-bottom: 16px; }
.modal .close-btn { float: right; background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--text-light); }

/* checkbox */
.checkbox-group { display: flex; align-items: center; gap: 8px; margin-bottom: 18px; font-size: .93rem; }
.checkbox-group input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--primary); }

/* hero */
.hero { background: linear-gradient(135deg, var(--primary), #4285f4, #66b2ff); color: #fff; padding: 50px 20px; text-align: center; border-radius: 0 0 20px 20px; margin-bottom: 10px; }
.hero h1 { font-size: 2rem; margin-bottom: 10px; }
.hero p { font-size: 1.1rem; opacity: .9; }

/* 移动端 */
@media (max-width: 768px) {
    .nav-links { display: none; position: absolute; top: 60px; left: 0; right: 0; background: var(--primary); flex-direction: column; padding: 10px 0; gap: 0; }
    .nav-links.open { display: flex; }
    .nav-links a { padding: 12px 20px; border-radius: 0; }
    .hamburger { display: block; }
    .hero h1 { font-size: 1.5rem; }
    .container { margin: 16px auto; }
    .form-card { padding: 24px; }
    .recharge-options { grid-template-columns: repeat(2, 1fr); }
}