/* ==================== 基础变量 ==================== */
:root {
    /* 主色调 - 深蓝专业风格 */
    --primary: #1a365d;
    --primary-light: #2c5282;
    --primary-dark: #0f2942;
    
    /* 强调色 */
    --accent: #3182ce;
    --accent-light: #4299e1;
    --accent-gradient: linear-gradient(135deg, #3182ce 0%, #2c5282 100%);
    
    /* 商贷色系 - 温暖橙色 */
    --commercial: #dd6b20;
    --commercial-light: #ed8936;
    --commercial-bg: #fffaf0;
    --commercial-border: #fbd38d;
    
    /* 公积金色系 - 清新绿色 */
    --fund: #2f855a;
    --fund-light: #38a169;
    --fund-bg: #f0fff4;
    --fund-border: #9ae6b4;
    
    /* 状态色 */
    --success: #38a169;
    --warning: #d69e2e;
    --danger: #e53e3e;
    
    /* 中性色 */
    --gray-50: #f7fafc;
    --gray-100: #edf2f7;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e0;
    --gray-400: #a0aec0;
    --gray-500: #718096;
    --gray-600: #4a5568;
    --gray-700: #2d3748;
    --gray-800: #1a202c;
    
    /* 背景 */
    --bg-body: #f0f4f8;
    --bg-card: #ffffff;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* 过渡 */
    --transition: all 0.2s ease;
}

/* ==================== 基础重置 ==================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    -webkit-tap-highlight-color: transparent;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg-body);
    color: var(--gray-700);
    line-height: 1.6;
    min-height: 100vh;
}

/* ==================== 应用容器 ==================== */
.app-container {
    max-width: 1000px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ==================== 头部 ==================== */
.app-header {
    background: var(--accent-gradient);
    padding: 30px 20px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.app-header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 60%);
    animation: shimmer 15s linear infinite;
}

@keyframes shimmer {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.header-content {
    position: relative;
    z-index: 1;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: white;
    font-size: 1.5em;
    font-weight: 700;
}

.logo i {
    font-size: 1.3em;
}

.tagline {
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.9em;
    margin-top: 8px;
    letter-spacing: 2px;
}

/* ==================== 主内容区 ==================== */
.main-content {
    flex: 1;
    padding: 20px;
}

/* ==================== 日期选择器 ==================== */
.date-selector {
    margin-bottom: 20px;
}

.date-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 16px 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: var(--shadow);
    max-width: 320px;
    margin: 0 auto;
}

.date-card i {
    font-size: 1.5em;
    color: var(--accent);
}

.date-input-wrap {
    flex: 1;
}

.date-input-wrap label {
    display: block;
    font-size: 0.75em;
    color: var(--gray-500);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.date-input-wrap input {
    width: 100%;
    border: none;
    font-size: 1.1em;
    font-weight: 600;
    color: var(--gray-800);
    background: transparent;
    outline: none;
}

/* ==================== 贷款卡片 ==================== */
.loan-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.loan-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.loan-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.loan-card .card-header {
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 14px;
}

.loan-card.commercial .card-header {
    background: linear-gradient(135deg, var(--commercial) 0%, var(--commercial-light) 100%);
}

.loan-card.fund .card-header {
    background: linear-gradient(135deg, var(--fund) 0%, var(--fund-light) 100%);
}

.card-icon {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-icon i {
    font-size: 1.4em;
    color: white;
}

.card-header h3 {
    color: white;
    font-size: 1.1em;
    font-weight: 600;
}

.card-body {
    padding: 20px;
}

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

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-size: 0.85em;
    font-weight: 500;
    color: var(--gray-600);
    margin-bottom: 6px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.input-with-unit {
    position: relative;
    display: flex;
    align-items: center;
}

.input-with-unit input {
    flex: 1;
    padding: 12px 14px;
    padding-right: 45px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: 1em;
    color: var(--gray-800);
    transition: var(--transition);
    width: 100%;
}

.input-with-unit input:focus {
    border-color: var(--accent);
    outline: none;
    box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.15);
}

.input-with-unit .unit {
    position: absolute;
    right: 14px;
    color: var(--gray-400);
    font-size: 0.9em;
    pointer-events: none;
}

select {
    width: 100%;
    padding: 12px 14px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: 1em;
    color: var(--gray-800);
    background: white;
    cursor: pointer;
    transition: var(--transition);
    appearance: none;
    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='%23718096' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
}

select:focus {
    border-color: var(--accent);
    outline: none;
    box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.15);
}

/* ==================== 事件管理区 ==================== */
.events-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.event-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow);
}

.event-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--gray-100);
}

.event-header i {
    font-size: 1.2em;
    color: var(--accent);
}

.event-header h4 {
    font-size: 1em;
    font-weight: 600;
    color: var(--gray-700);
}

.event-list {
    min-height: 20px;
    margin-bottom: 12px;
}

.event-row {
    background: var(--gray-50);
    border-radius: var(--radius);
    padding: 12px;
    margin-bottom: 10px;
    border-left: 4px solid var(--gray-300);
    transition: var(--transition);
}

.event-row.type-com {
    border-left-color: var(--commercial);
    background: var(--commercial-bg);
}

.event-row.type-fund {
    border-left-color: var(--fund);
    background: var(--fund-bg);
}

.event-row-content {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}

.event-row select {
    padding: 8px 10px;
    font-size: 0.85em;
    min-width: 75px;
    flex: 0 0 auto;
}

.event-row .input-group {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 1;
    min-width: 120px;
}

.event-row .input-group input {
    width: 60px;
    padding: 8px 10px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: 0.9em;
}

.date-badge {
    background: var(--gray-200);
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    font-size: 0.8em;
    color: var(--gray-600);
    font-weight: 500;
    white-space: nowrap;
}

.input-with-unit.small {
    flex: 0 0 90px;
}

.input-with-unit.small input {
    padding: 8px 10px;
    padding-right: 28px;
    font-size: 0.9em;
}

.input-with-unit.small .unit {
    right: 10px;
    font-size: 0.8em;
}

.event-row .evt-strat {
    flex: 0 0 85px;
    padding: 8px 10px;
    font-size: 0.85em;
}

.btn-del {
    width: 36px;
    height: 36px;
    border: none;
    background: rgba(229, 62, 62, 0.1);
    color: var(--danger);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-del:hover {
    background: var(--danger);
    color: white;
}

.btn-add {
    width: 100%;
    padding: 12px;
    border: 2px dashed var(--gray-300);
    background: transparent;
    color: var(--gray-500);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.9em;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition);
}

.btn-add:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(49, 130, 206, 0.05);
}

/* ==================== 提示卡片 ==================== */
.tip-card {
    background: linear-gradient(135deg, #fefce8 0%, #fef9c3 100%);
    border: 1px solid #fde047;
    border-radius: var(--radius);
    padding: 16px 20px;
    display: flex;
    gap: 14px;
    margin-bottom: 20px;
}

.tip-icon {
    width: 40px;
    height: 40px;
    background: #fde047;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.tip-icon i {
    color: #a16207;
    font-size: 1.1em;
}

.tip-content strong {
    display: block;
    color: #a16207;
    font-size: 0.9em;
    margin-bottom: 4px;
}

.tip-content p {
    font-size: 0.85em;
    color: #92400e;
    line-height: 1.5;
}

/* ==================== 计算按钮 ==================== */
.btn-calculate {
    width: 100%;
    padding: 18px 24px;
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius);
    color: white;
    font-size: 1.1em;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: var(--transition);
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}

.btn-calculate:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

/* ==================== 分析面板 ==================== */
.analysis-panel {
    display: none;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    margin-bottom: 24px;
    overflow: hidden;
}

.panel-header {
    background: linear-gradient(135deg, #f6ad55 0%, #ed8936 100%);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    color: white;
}

.panel-header i {
    font-size: 1.3em;
}

.panel-header h3 {
    font-size: 1.1em;
    font-weight: 600;
    flex: 1;
}

.panel-header .badge {
    background: rgba(255, 255, 255, 0.2);
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75em;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 20px;
}

.stat-card {
    background: var(--gray-50);
    border-radius: var(--radius);
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 14px;
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-card.savings .stat-icon {
    background: linear-gradient(135deg, #48bb78 0%, #38a169 100%);
}

.stat-card.time .stat-icon {
    background: linear-gradient(135deg, #4299e1 0%, #3182ce 100%);
}

.stat-icon i {
    color: white;
    font-size: 1.3em;
}

.stat-info {
    flex: 1;
}

.stat-label {
    display: block;
    font-size: 0.8em;
    color: var(--gray-500);
    margin-bottom: 2px;
}

.stat-info strong {
    font-size: 1.2em;
    color: var(--gray-800);
}

/* ==================== 图表卡片 ==================== */
.chart-card {
    margin: 0 20px 20px;
    padding: 20px;
    background: var(--gray-50);
    border-radius: var(--radius);
}

.chart-card h5 {
    font-size: 0.9em;
    color: var(--gray-700);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.chart-card h5 i {
    color: var(--accent);
}

.chart-container {
    height: 200px;
    position: relative;
}

.chart-legend {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-top: 12px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85em;
    color: var(--gray-600);
}

.legend-item .line {
    width: 24px;
    height: 3px;
    border-radius: 2px;
}

.legend-item.old .line {
    background: var(--gray-400);
    background: repeating-linear-gradient(
        90deg,
        var(--gray-400) 0px,
        var(--gray-400) 4px,
        transparent 4px,
        transparent 8px
    );
}

.legend-item.new .line {
    background: var(--accent);
}

/* ==================== 明细表格 ==================== */
.detail-card {
    margin: 0 20px 20px;
}

.detail-card h5 {
    font-size: 0.9em;
    color: var(--gray-700);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.detail-card h5 i {
    color: var(--warning);
}

.table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.detail-table {
    width: 100%;
    min-width: 450px;
    border-collapse: collapse;
    font-size: 0.85em;
}

.detail-table th {
    background: var(--gray-100);
    padding: 12px;
    text-align: left;
    font-weight: 600;
    color: var(--gray-600);
    white-space: nowrap;
}

.detail-table td {
    padding: 12px;
    border-bottom: 1px solid var(--gray-100);
}

.detail-table tr:last-child td {
    border-bottom: none;
}

/* ==================== 结果面板 ==================== */
.result-panel {
    display: none;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.result-panel .panel-header {
    background: var(--accent-gradient);
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    padding: 20px;
}

.summary-card {
    background: var(--gray-50);
    border-radius: var(--radius);
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.summary-card i {
    font-size: 1.5em;
    opacity: 0.8;
}

.summary-card.total i { color: var(--accent); }
.summary-card.interest i { color: var(--warning); }
.summary-card.commercial i { color: var(--commercial); }
.summary-card.fund i { color: var(--fund); }

.summary-card span {
    display: block;
    font-size: 0.75em;
    color: var(--gray-500);
}

.summary-card strong {
    font-size: 1em;
    color: var(--gray-800);
}

.schedule-card {
    padding: 0 20px 20px;
}

.schedule-table {
    width: 100%;
    min-width: 600px;
    border-collapse: collapse;
    font-size: 0.85em;
}

.schedule-table th {
    background: var(--gray-100);
    padding: 12px 10px;
    text-align: center;
    font-weight: 600;
    color: var(--gray-600);
    white-space: nowrap;
    position: sticky;
    top: 0;
}

.schedule-table td {
    padding: 10px;
    text-align: right;
    border-bottom: 1px solid var(--gray-100);
}

.schedule-table tr:nth-child(even) {
    background: var(--gray-50);
}

.schedule-table .row-rate-change {
    background: #fffbeb !important;
}

.schedule-table .row-prepay {
    background: #ecfdf5 !important;
    font-weight: 500;
}

/* ==================== 标签样式 ==================== */
.note-tag {
    display: inline-block;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.75em;
    font-weight: 600;
    color: white;
    margin-right: 4px;
}

.note-tag.bg-com { background: var(--commercial); }
.note-tag.bg-fund { background: var(--fund); }

/* ==================== 差异样式 ==================== */
.diff-good {
    color: var(--success) !important;
    font-weight: 600;
}

.diff-bad {
    color: var(--danger) !important;
    font-weight: 600;
}

.diff-neutral {
    color: var(--gray-400);
}

/* ==================== 页脚 ==================== */
.app-footer {
    text-align: center;
    padding: 20px;
    color: var(--gray-500);
    font-size: 0.8em;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 640px) {
    .app-header {
        padding: 24px 16px;
    }

    .logo {
        font-size: 1.3em;
    }

    .tagline {
        font-size: 0.8em;
        letter-spacing: 1px;
    }

    .main-content {
        padding: 16px;
    }

    .loan-cards,
    .events-section {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: 12px;
        padding: 16px;
    }

    .summary-grid {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
        padding: 16px;
    }

    .summary-card {
        padding: 12px;
        flex-direction: column;
        text-align: center;
        gap: 8px;
    }

    .summary-card i {
        font-size: 1.3em;
    }

    .chart-card,
    .detail-card {
        margin: 0 16px 16px;
    }

    .chart-container {
        height: 180px;
    }

    .event-row-content {
        gap: 6px;
    }

    .event-row .input-group {
        min-width: 100px;
    }

    .btn-calculate {
        padding: 16px;
        font-size: 1em;
    }

    .tip-card {
        flex-direction: column;
        align-items: flex-start;
    }

    .schedule-card {
        padding: 0 16px 16px;
    }
}

@media (max-width: 400px) {
    .event-row select {
        min-width: 65px;
        font-size: 0.8em;
        padding: 6px 8px;
    }

    .event-row .input-group input {
        width: 50px;
        padding: 6px 8px;
        font-size: 0.85em;
    }

    .input-with-unit.small {
        flex: 0 0 75px;
    }

    .event-row .evt-strat {
        flex: 0 0 75px;
        font-size: 0.8em;
        padding: 6px 8px;
    }

    .date-badge {
        padding: 4px 6px;
        font-size: 0.75em;
    }
}

/* ==================== 帮助按钮 & 弹窗 ==================== */

.app-header {
    position: relative;
}

.app-header::before {
    pointer-events: none;
    z-index: 0;
}

.header-content {
    position: relative;
    z-index: 1;
    width: 100%;
}

.help-btn {
    position: absolute;
    top: 16px;
    right: 16px;

    width: 40px;
    height: 40px;
    border: none;
    border-radius: 999px;

    background: rgba(255, 255, 255, 0.18);
    color: #fff;
    cursor: pointer;

    display: inline-flex;
    align-items: center;
    justify-content: center;

    transition: var(--transition);
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.12);

    transform: none;
}

.help-btn:hover {
    background: rgba(255, 255, 255, 0.28);
    transform: translateY(-2px);
}

.help-btn i {
    font-size: 18px;
}

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 41, 66, 0.55);
    backdrop-filter: blur(4px);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.modal-card {
    width: min(720px, 100%);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.modal-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 16px 18px;
    background: var(--accent-gradient);
    color: #fff;
}

.modal-header h3 {
    font-size: 1.05em;
    font-weight: 700;
    flex: 1;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.modal-close {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.18);
    color: #fff;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.28);
}

.modal-body {
    padding: 16px 18px;
    color: var(--gray-700);
    font-size: 0.95em;
    line-height: 1.7;
}

.modal-section {
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid var(--gray-100);
}

.modal-section h4 {
    font-size: 0.95em;
    margin-bottom: 8px;
    color: var(--gray-800);
}

.modal-body ul {
    padding-left: 18px;
}

.modal-body li {
    margin: 6px 0;
}

.modal-footer {
    padding: 14px 18px 18px;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    background: var(--gray-50);
}

.modal-btn {
    border: none;
    border-radius: var(--radius);
    padding: 10px 14px;
    background: var(--accent);
    color: #fff;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.modal-btn:hover {
    background: var(--accent-light);
}

@media (max-width: 640px) {
    .help-btn {
        width: 38px;
        height: 38px;
        top: 12px;
        right: 12px;
    }
}