:root {
    --primary: #10b981;
    --primary-hover: #059669;
    --bg-main: #f8fafc;
    --card-bg: rgba(255, 255, 255, 0.82);
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
    --danger: #ef4444;
    --radius: 16px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg-main);
    color: var(--text-main);
    line-height: 1.5;
    min-height: 100vh;
    padding-bottom: 50px;
}

.auth-container {
    max-width: 400px;
    margin: 100px auto;
    padding: 24px;
}

.app-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    display: none; /* 登录后显示 */
}

/* 玻璃拟态卡片 */
.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius);
    box-shadow: var(--glass-shadow);
    padding: 24px;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

/* 渐变文本 */
.gradient-text {
    background: linear-gradient(135deg, #10b981 0%, #3b82f6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
}

/* 现代输入框 */
.input-group {
    margin-bottom: 16px;
}

.input-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-muted);
}

input, textarea {
    width: 100%;
    padding: 12px 16px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: white;
    font-size: 16px;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus, textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

/* 高级按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    gap: 8px;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.2);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: translateY(0);
}

/* 记账模式切换器 */
.mode-switch {
    display: flex;
    background: #f1f5f9;
    padding: 4px;
    border-radius: 12px;
    margin-bottom: 20px;
}

.mode-tab {
    flex: 1;
    text-align: center;
    padding: 10px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-muted);
    transition: all 0.2s;
}

.mode-tab.active {
    background: white;
    color: var(--text-main);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

/* 暂存条目 */
.staging-item {
    border-left: 4px solid var(--primary);
    margin-bottom: 12px;
    padding-left: 14px;
}

.staging-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 4px;
}

.staging-amount {
    font-weight: 700;
    font-size: 18px;
}

.staging-meta {
    font-size: 13px;
    color: var(--text-muted);
}

/* 动画库 */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    animation: fadeIn 0.4s ease-out forwards;
}