/* 信用卡消费还款管理系统 - 样式 */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #059669;
    --danger: #dc2626;
    --warning: #d97706;
    --bg: #f8fafc;
    --card-bg: #fff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,.08);
}

* { box-sizing: border-box; }
body { margin: 0; font-family: "Microsoft YaHei", "PingFang SC", sans-serif; background: var(--bg); color: var(--text); line-height: 1.5; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.main-nav {
    background: var(--card-bg);
    box-shadow: var(--shadow);
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
}
.nav-brand a { font-weight: 700; color: var(--text); font-size: 1.1rem; }
.nav-menu { list-style: none; margin: 0; padding: 0; display: flex; gap: 0.5rem; flex-wrap: wrap; align-items: center; }
.nav-menu a { padding: 0.5rem 0.75rem; border-radius: var(--radius); }
.nav-menu a:hover { background: var(--bg); }
.nav-menu a.active { background: var(--primary); color: #fff; }
.nav-user { margin-left: 1rem; color: var(--text-muted); font-size: 0.9rem; }
.nav-user a { margin-left: 0.5rem; }

.main-content { max-width: 1200px; margin: 0 auto; padding: 1.5rem; }
.main-footer { text-align: center; padding: 1rem; color: var(--text-muted); font-size: 0.85rem; border-top: 1px solid var(--border); margin-top: 2rem; }

/* 表单 */
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.25rem; font-weight: 500; color: var(--text); }
.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(37,99,235,.2);
}
.form-inline { display: flex; gap: 1rem; flex-wrap: wrap; align-items: flex-end; }
.form-inline .form-group { margin-bottom: 0; }

.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.95rem;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-secondary { background: var(--text-muted); color: #fff; }
.btn-sm { padding: 0.35rem 0.65rem; font-size: 0.85rem; }

/* 卡片与表格 */
.card { background: var(--card-bg); border-radius: var(--radius); box-shadow: var(--shadow); padding: 1.25rem; margin-bottom: 1.5rem; }
.card-title { margin: 0 0 1rem; font-size: 1.1rem; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 0.6rem 0.75rem; text-align: left; border-bottom: 1px solid var(--border); }
th { background: var(--bg); font-weight: 600; color: var(--text); }
tr:hover { background: #f8fafc; }
.amount { font-family: "Consolas", monospace; }
.amount.positive { color: var(--success); }
.amount.negative { color: var(--danger); }
.text-danger { color: var(--danger); }
.form-hint { font-size: 0.9rem; color: var(--text-muted); margin: 0.5rem 0; }

/* 登录/注册页 */
.auth-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 1rem; }
.auth-box { width: 100%; max-width: 400px; background: var(--card-bg); padding: 2rem; border-radius: var(--radius); box-shadow: var(--shadow); }
.auth-box h1 { margin: 0 0 1.5rem; text-align: center; font-size: 1.5rem; }
.auth-box .form-group { margin-bottom: 1rem; }
.auth-box .btn { width: 100%; padding: 0.65rem; margin-top: 0.5rem; }
.auth-link { text-align: center; margin-top: 1rem; font-size: 0.9rem; color: var(--text-muted); }

/* 提示与统计 */
.alert { padding: 0.75rem 1rem; border-radius: var(--radius); margin-bottom: 1rem; }
.alert-warning { background: #fef3c7; color: #92400e; border: 1px solid #fcd34d; }
.alert-danger { background: #fee2e2; color: #991b1b; border: 1px solid #fca5a5; }
.alert-success { background: #d1fae5; color: #065f46; border: 1px solid #6ee7b7; }
.alert-info { background: #dbeafe; color: #1e40af; border: 1px solid #93c5fd; }

.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 1rem; margin-bottom: 1.5rem; }
.stat-card { background: var(--card-bg); padding: 1rem; border-radius: var(--radius); box-shadow: var(--shadow); }
.stat-card .label { font-size: 0.85rem; color: var(--text-muted); }
.stat-card .value { font-size: 1.25rem; font-weight: 600; }

/* 日历 */
.calendar-wrap { background: var(--card-bg); padding: 1rem; border-radius: var(--radius); margin-bottom: 1.5rem; }
.calendar { width: 100%; }
.calendar th, .calendar td { padding: 0.5rem; text-align: center; border: 1px solid var(--border); }
.calendar th { background: var(--bg); }
.calendar .due { background: #fef3c7; }
.calendar .today { background: #dbeafe; }

/* 模态与操作列 */
.actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.modal { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 100; align-items: center; justify-content: center; padding: 1rem; }
.modal.show { display: flex; }
.modal-content { background: var(--card-bg); padding: 1.5rem; border-radius: var(--radius); max-width: 500px; width: 100%; max-height: 90vh; overflow-y: auto; }
.modal-title { margin: 0 0 1rem; }
.filter-bar { margin-bottom: 1rem; display: flex; gap: 1rem; flex-wrap: wrap; align-items: center; }