/* 全局CSS变量 - 统一风格 */
:root {
    --primary: #0f3460;
    --accent: #1a73e8;
    --border: #dadce0;
    --secondary: #5f6368;
    --success: #34a853;
    --danger: #ea4335;
    --warning: #f59e0b;
    --light-bg: #f8fafc;
    --white: #ffffff;
}

/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body {
    background-color: #f1f5f9;
    color: #202124;
    line-height: 1.6;
    padding-bottom: 40px;
}

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 导航栏 */
nav {
    background: var(--primary);
    color: white;
    padding: 12px 0;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.logo {
    color: white;
    font-size: 1.25rem;
    font-weight: 700;
    text-decoration: none;
}

.back-link, .nav-link {
    color: white;
    text-decoration: none;
    font-size: 0.95rem;
    opacity: 0.9;
    transition: opacity 0.2s;
}

.back-link:hover, .nav-link:hover {
    opacity: 1;
    text-decoration: underline;
}

.nav-menu {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

/* 标题 */
h1 {
    font-size: 1.8rem;
    color: var(--primary);
    margin-bottom: 20px;
    text-align: center;
}

h2 {
    font-size: 1.4rem;
    color: var(--primary);
    margin: 25px 0 15px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--accent);
}

h3 {
    font-size: 1.2rem;
    color: var(--primary);
    margin: 20px 0 10px;
}

/* 卡片 */
.card {
    background: var(--white);
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    padding: 20px;
    margin-bottom: 20px;
}

/* 输入框组 */
.input-group {
    margin-bottom: 15px;
}

.input-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--primary);
    font-size: 0.95rem;
}

.input-group input, .input-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.input-group input:focus, .input-group select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(26, 115, 232, 0.2);
}

.input-group input[readonly] {
    background: #f1f5f9;
    cursor: not-allowed;
    opacity: 0.8;
}

.input-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.input-sub-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.input-sub-group .input-group {
    margin: 0;
}

/* 按钮 */
button {
    width: 100%;
    padding: 12px 16px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

button:hover {
    background: #0a2440;
}

.btn-success {
    background: var(--success);
}

.btn-success:hover {
    background: #2d8f46;
}

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

.btn-accent:hover {
    background: #1557b0;
}

.btn-warning {
    background: var(--warning);
}

.btn-warning:hover {
    background: #d97706;
}

.btn-danger {
    background: var(--danger);
}

.btn-danger:hover {
    background: #c53929;
}

/* 结果展示 */
.result {
    background: #e8f0fe;
    border-left: 4px solid var(--accent);
    padding: 15px;
    border-radius: 6px;
    font-size: 0.95rem;
}

.result strong {
    color: var(--primary);
}

/* 结果明细 */
.result-detail {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px;
    margin: 15px 0;
}

.result-item {
    background: var(--light-bg);
    padding: 12px 15px;
    border-radius: 6px;
    border-left: 3px solid var(--primary);
}

.result-item span {
    font-size: 0.85rem;
    color: var(--secondary);
    display: block;
}

.result-item strong {
    font-size: 1.15rem;
    color: var(--primary);
}

.result-item.total {
    grid-column: 1 / -1;
    border-left-color: var(--success);
}

.result-item.total strong {
    font-size: 1.4rem;
    color: var(--success);
}

/* 表格样式 */
.table-wrap {
    overflow-x: auto;
    margin: 20px 0;
    max-height: 800px;
    overflow-y: auto;
}

.retire-table {
    width: 100%;
    min-width: 700px;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.retire-table thead tr {
    background: var(--primary) !important;
    color: var(--white) !important;
    position: sticky;
    top: 0;
    z-index: 10;
}

.retire-table th {
    padding: 12px 8px;
    text-align: center;
    border: 1px solid var(--white);
    font-weight: 700;
    white-space: nowrap;
}

.retire-table td {
    padding: 12px 8px;
    text-align: center;
    border: 1px solid var(--border);
}

.retire-table tbody tr:nth-child(even) {
    background: var(--light-bg);
}

.retire-table tbody tr:hover {
    background: #e8f0fe;
}

/* 按钮组 */
.table-btn-group, .btn-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 10px;
    margin-top: 15px;
}

.table-btn {
    padding: 10px 16px;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
}

/* 提示文本 */
.type-tip, .table-note {
    font-size: 0.8rem;
    color: var(--secondary);
    margin-top: 5px;
    line-height: 1.4;
}

.error-text {
    font-size: 0.8rem;
    color: var(--danger);
    margin-top: 5px;
    display: none;
}

.law-note, .tax-note {
    background: #e8f0fe;
    padding: 12px 15px;
    border-radius: 6px;
    font-size: 0.85rem;
    color: var(--secondary);
    margin-top: 15px;
    line-height: 1.6;
}

.law-note strong, .tax-note strong {
    color: var(--primary);
}

/* 工具导航内链 */
.tools-nav {
    margin: 30px 0;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 15px;
    margin-top: 15px;
}

.tool-card {
    background: var(--white);
    border-radius: 8px;
    padding: 18px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    text-decoration: none;
    color: inherit;
    transition: transform 0.2s, box-shadow 0.2s;
    border-left: 3px solid var(--accent);
}

.tool-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.tool-card h4 {
    color: var(--primary);
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.tool-card p {
    font-size: 0.85rem;
    color: var(--secondary);
    line-height: 1.5;
}

.tool-card.highlight {
    border-left-color: var(--success);
    background: #f0fdf4;
    grid-column: 1 / -1;
}

.tool-card.highlight h4 {
    font-size: 1.3rem;
    color: var(--success);
}

/* 对比框 */
.compare-box {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin: 15px 0;
}

.compare-item {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 15px;
}

.compare-item.best {
    border: 2px solid var(--success);
    background: #f0fdf4;
}

.compare-item.worse {
    border: 2px solid var(--danger);
    background: #fef2f2;
}

.compare-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary);
    text-align: center;
    margin-bottom: 10px;
}

.compare-detail {
    line-height: 1.8;
    font-size: 0.95rem;
}

.compare-detail p {
    margin: 5px 0;
    display: flex;
    justify-content: space-between;
}

.best-tag {
    display: inline-block;
    background: var(--success);
    color: #fff;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: normal;
}

.worse-tag {
    display: inline-block;
    background: var(--danger);
    color: #fff;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: normal;
}

/* 日期输入框 */
.date-input-wrap {
    position: relative;
    width: 100%;
}

#entryDate {
    width: 100%;
    padding-right: 40px;
    box-sizing: border-box;
}

.date-icon {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--primary);
    font-size: 1.1rem;
    user-select: none;
    pointer-events: none;
    z-index: 2;
}

#nativeDatePicker {
    position: absolute;
    right: 0;
    top: 0;
    width: 40px;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 1;
    padding: 0;
    border: none;
}

/* 页脚 */
footer {
    max-width: 1200px;
    margin: 40px auto 0;
    padding: 20px 15px;
    text-align: center;
    font-size: 0.85rem;
    color: var(--secondary);
    border-top: 1px solid var(--border);
}

.footer-links a {
    color: var(--accent);
    text-decoration: none;
    margin: 0 8px;
}

.footer-links a:hover {
    text-decoration: underline;
}

/* 打印样式 */
@media print {
    nav, button, .back-link, .tools-nav, footer, .card:first-of-type {
        display: none !important;
    }
    @page {
        size: A4 portrait;
        margin: 15mm 10mm;
    }
    body {
        background: #fff !important;
        padding: 0 !important;
        margin: 0 !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
    .container {
        max-width: 100% !important;
        padding: 0 !important;
        margin: 0 !important;
    }
    .card {
        box-shadow: none !important;
        border: none !important;
        padding: 0 !important;
        margin: 0 !important;
    }
    h2 {
        font-size: 16pt !important;
        text-align: center !important;
        margin: 0 0 10px 0 !important;
        border: none !important;
        padding: 0 !important;
    }
    .retire-table {
        width: 100% !important;
        min-width: auto !important;
        font-size: 11pt !important;
    }
    .retire-table thead {
        display: table-header-group !important;
    }
    .retire-table thead tr {
        background: var(--primary) !important;
        color: #ffffff !important;
        -webkit-print-color-adjust: exact !important;
    }
    .retire-table th {
        border: 1px solid #ffffff !important;
        font-weight: 700 !important;
    }
    .retire-table th, .retire-table td {
        padding: 8px 4px !important;
        border: 1px solid #999 !important;
    }
}

/* 移动端适配 */
@media (max-width: 768px) {
    .input-row, .input-sub-group, .compare-box {
        grid-template-columns: 1fr;
    }
    .nav-container {
        flex-direction: column;
        align-items: flex-start;
    }
    .nav-menu {
        width: 100%;
        overflow-x: auto;
        padding-bottom: 5px;
    }
    h1 {
        font-size: 1.5rem;
    }
    .tool-card.highlight {
        grid-column: auto;
    }
}