/* ==================== CSS 变量 ==================== */
:root {
    /* 颜色 */
    --primary: #0F172A;
    --secondary: #1E3A8A;
    --cta: #CA8A04;
    --background: #F8FAFC;
    --text: #020617;
    --text-muted: #475569;

    /* 毛玻璃效果 */
    --glass-bg: rgba(255, 255, 255, 0.25);
    --glass-border: rgba(255, 255, 255, 0.3);
    --glass-shadow: rgba(0, 0, 0, 0.1);
    --glass-blur: 20px;

    /* 收入/支出颜色 */
    --income-color: #10B981;
    --expense-color: #EF4444;

    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* 动画 */
    --transition-fast: 150ms;
    --transition-normal: 250ms;
    --transition-slow: 350ms;
}

/* ==================== 重置样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text);
    background: var(--background);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

button {
    font-family: inherit;
    border: none;
    background: none;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

input, select {
    font-family: inherit;
    border: none;
    outline: none;
}

/* ==================== 背景容器 ==================== */
.background-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-size: cover;
    background-position: center;
    transition: opacity var(--transition-slow);
}

/* ==================== 主容器 ==================== */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding-bottom: 80px;
}

.page-content {
    flex: 1;
    padding: var(--spacing-lg) var(--spacing-md);
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
}

/* ==================== 页面切换 ==================== */
.page {
    display: none;
    animation: fadeIn var(--transition-normal) ease-out;
}

.page.active {
    display: block;
}

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

/* ==================== 页面标题 ==================== */
.page-header {
    margin-bottom: var(--spacing-lg);
}

.page-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* ==================== 毛玻璃卡片 ==================== */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    box-shadow:
        0 8px 32px var(--glass-shadow),
        inset 0 1px 0 rgba(255, 255, 255, 0.5);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.glass-card.large {
    padding: var(--spacing-xl);
}

.glass-card:hover {
    transform: translateY(-2px);
    box-shadow:
        0 12px 40px var(--glass-shadow),
        inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

/* ==================== 卡片内容 ==================== */
.card-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
}

.card-subtitle {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: var(--spacing-md);
}

.amount-display {
    font-size: 48px;
    font-weight: 700;
    color: var(--primary);
    font-variant-numeric: tabular-nums;
}

.amount-value {
    font-size: 24px;
    font-weight: 600;
    color: var(--primary);
    font-variant-numeric: tabular-nums;
}

.amount-value.income {
    color: var(--income-color);
}

.amount-value.expense {
    color: var(--expense-color);
}

/* ==================== 统计网格 ==================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* ==================== 预算进度 ==================== */
.budget-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.budget-text {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
}

.progress-bar {
    height: 12px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 999px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--income-color), var(--cta));
    border-radius: 999px;
    transition: width var(--transition-normal), background var(--transition-normal);
}

.progress-fill.warning {
    background: linear-gradient(90deg, #F59E0B, #EF4444);
}

.progress-fill.danger {
    background: var(--expense-color);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

.budget-days {
    font-size: 12px;
    color: var(--text-muted);
    text-align: right;
}

/* ==================== 悬浮按钮 ==================== */
.fab {
    position: fixed;
    bottom: 96px;
    right: var(--spacing-lg);
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--secondary), var(--cta));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    z-index: 10;
}

.fab:hover {
    transform: scale(1.1);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.fab:active {
    transform: scale(0.95);
}

/* ==================== 日历 ==================== */
.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.calendar-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary);
}

.calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
    text-align: center;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: var(--spacing-xs);
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    background: rgba(255, 255, 255, 0.2);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}

.calendar-day:hover {
    background: rgba(255, 255, 255, 0.4);
    transform: scale(1.05);
}

.calendar-day.other-month {
    color: var(--text-muted);
    opacity: 0.5;
}

.calendar-day.today {
    border: 2px solid var(--secondary);
    font-weight: 700;
}

.calendar-day.selected {
    background: var(--secondary);
    color: white;
}

.calendar-day.has-transaction::after {
    content: '';
    position: absolute;
    bottom: 4px;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--expense-color);
}

.calendar-day.has-income::after {
    background: var(--income-color);
}

.calendar-day.has-both::after {
    background: linear-gradient(90deg, var(--income-color) 50%, var(--expense-color) 50%);
}

/* ==================== 类型切换 ==================== */
.type-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    position: relative;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    padding: var(--spacing-xs);
}

.type-tab {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 600;
    color: var(--text-muted);
    transition: color var(--transition-fast);
    z-index: 1;
}

.type-tab.active {
    color: var(--primary);
}

.tab-indicator {
    position: absolute;
    top: var(--spacing-xs);
    left: var(--spacing-xs);
    width: calc(50% - var(--spacing-xs));
    height: calc(100% - var(--spacing-xs) * 2);
    background: rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-sm);
    transition: transform var(--transition-normal);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* ==================== 金额输入 ==================== */
.amount-input-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

.currency-symbol {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-muted);
    margin-right: var(--spacing-sm);
}

.amount-input {
    font-size: 48px;
    font-weight: 700;
    color: var(--primary);
    background: transparent;
    text-align: center;
    width: 100%;
    max-width: 300px;
    font-variant-numeric: tabular-nums;
}

.amount-input::placeholder {
    color: var(--text-muted);
    opacity: 0.5;
}

/* ==================== 表单 ==================== */
.form-section {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: var(--spacing-sm);
}

.text-input {
    width: 100%;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.3);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    font-size: 16px;
    color: var(--text);
    transition: all var(--transition-fast);
}

.text-input:focus {
    background: rgba(255, 255, 255, 0.5);
    border-color: var(--secondary);
    box-shadow: 0 0 0 3px rgba(30, 58, 138, 0.1);
}

.text-input::placeholder {
    color: var(--text-muted);
}

/* ==================== 分类网格 ==================== */
.category-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
}

.category-item {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.category-item:hover {
    background: rgba(255, 255, 255, 0.4);
    transform: scale(1.05);
}

.category-item.active {
    background: rgba(255, 255, 255, 0.5);
    border-color: var(--secondary);
}

.category-icon {
    font-size: 24px;
}

.category-name {
    font-size: 12px;
    font-weight: 500;
    color: var(--text);
}

/* ==================== 日期选择器按钮 ==================== */
.date-picker-btn {
    width: 100%;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.3);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 16px;
    font-weight: 500;
    color: var(--text);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.date-picker-btn:hover {
    background: rgba(255, 255, 255, 0.5);
}

/* ==================== 按钮 ==================== */
.primary-btn {
    width: 100%;
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--secondary), var(--cta));
    color: white;
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

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

.secondary-btn {
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.3);
    border: 1px solid var(--glass-border);
    color: var(--text);
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.secondary-btn:hover {
    background: rgba(255, 255, 255, 0.5);
}

.danger-btn {
    padding: var(--spacing-md);
    background: rgba(239, 68, 68, 0.2);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--expense-color);
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.danger-btn:hover {
    background: rgba(239, 68, 68, 0.3);
}

.icon-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    color: var(--text);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.4);
}

.button-group {
    display: flex;
    gap: var(--spacing-sm);
}

.button-group button {
    flex: 1;
}

/* ==================== 筛选器 ==================== */
.filter-card {
    position: sticky;
    top: var(--spacing-md);
    z-index: 5;
}

.filter-row {
    display: flex;
    gap: var(--spacing-sm);
}

.filter-select {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.3);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--text);
    cursor: pointer;
}

/* ==================== 交易列表 ==================== */
.transaction-group {
    margin-bottom: var(--spacing-lg);
}

.transaction-date-header {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
    padding: 0 var(--spacing-sm);
}

.transaction-item {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.transaction-item:hover {
    transform: translateX(-4px);
}

.transaction-icon {
    font-size: 24px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
}

.transaction-info {
    flex: 1;
}

.transaction-category {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 2px;
}

.transaction-note {
    font-size: 12px;
    color: var(--text-muted);
}

.transaction-amount {
    font-size: 18px;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.transaction-amount.income {
    color: var(--income-color);
}

.transaction-amount.expense {
    color: var(--expense-color);
}

.transaction-delete {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 80px;
    background: var(--expense-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    transform: translateX(100%);
    transition: transform var(--transition-normal);
}

.transaction-item.swiped .transaction-delete {
    transform: translateX(0);
}

/* ==================== 设置项 ==================== */
.setting-item {
    margin-bottom: var(--spacing-md);
}

.setting-item:last-child {
    margin-bottom: var(--spacing-lg);
}

.background-preview {
    width: 100%;
    height: 120px;
    border-radius: var(--radius-md);
    background: var(--glass-bg);
    border: 2px dashed var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    position: relative;
}

.background-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.preview-text {
    color: var(--text-muted);
    font-size: 14px;
}

/* ==================== 底部导航 ==================== */
.tab-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    border-top: 1px solid var(--glass-border);
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: var(--spacing-sm) 0;
    z-index: 100;
}

.tab-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-muted);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tab-item:hover {
    color: var(--primary);
}

.tab-item.active {
    color: var(--secondary);
}

.tab-item svg {
    transition: transform var(--transition-fast);
}

.tab-item:active svg {
    transform: scale(0.9);
}

/* ==================== 弹窗 ==================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: none;
    align-items: flex-end;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(10px);
    animation: fadeIn var(--transition-normal);
}

.modal-content {
    position: relative;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    padding: var(--spacing-lg);
    max-width: 600px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    animation: slideUp var(--transition-normal);
    box-shadow: 0 -8px 32px var(--glass-shadow);
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
    }
    to {
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.modal-header h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
}

.confirm-modal {
    border-radius: var(--radius-xl);
    max-height: none;
    animation: scaleIn var(--transition-normal);
}

@keyframes scaleIn {
    from {
        transform: scale(0.9);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.confirm-modal h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--spacing-md);
}

.confirm-modal p {
    font-size: 16px;
    color: var(--text);
    margin-bottom: var(--spacing-lg);
    line-height: 1.5;
}

/* ==================== 日历详情 ==================== */
.day-detail-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
}

.day-summary {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--glass-border);
}

.summary-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    font-size: 14px;
}

.summary-item.income {
    color: var(--income-color);
}

.summary-item.expense {
    color: var(--expense-color);
}

.summary-item span:last-child {
    font-size: 18px;
    font-weight: 700;
}

/* ==================== 响应式 ==================== */
@media (min-width: 768px) {
    .app-container {
        padding-bottom: 0;
    }

    .page-content {
        padding: var(--spacing-xl);
    }

    .tab-bar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        width: 80px;
        height: auto;
        flex-direction: column;
        justify-content: center;
        border-top: none;
        border-right: 1px solid var(--glass-border);
    }

    .page-content {
        margin-left: 80px;
    }

    .fab {
        right: calc(50% - 300px + var(--spacing-lg));
    }

    .modal {
        align-items: center;
    }

    .modal-content {
        border-radius: var(--radius-xl);
        max-height: 90vh;
    }
}

/* ==================== 无障碍 ==================== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ==================== 空状态 ==================== */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
}

.empty-state svg {
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state p {
    font-size: 16px;
    line-height: 1.5;
}