/* ========== 全局变量 ========== */
:root {
    --primary: #3b82f6;
    --primary-dark: #1e40af;
    --success: #22c55e;
    --danger: #ef4444;
    --warning: #f59e0b;
    --bg: #f1f5f9;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --radius: 10px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    font-size: 14px;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ========== 布局 ========== */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px;
}

/* ========== Header ========== */
.app-header {
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    color: white;
    padding: 20px 24px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.app-header h1 {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: 1px;
}

.app-header .subtitle {
    font-size: 13px;
    opacity: 0.75;
}

.header-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* ========== 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 6px;
    border: 1px solid transparent;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: #2563eb; }

.btn-success { background: var(--success); color: white; }
.btn-success:hover { background: #16a34a; }

.btn-warning { background: var(--warning); color: white; }
.btn-warning:hover { background: #d97706; }

.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #dc2626; }

.btn-outline { background: transparent; border-color: var(--border); color: var(--text); }
.btn-outline:hover { background: var(--bg); }

.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-lg { padding: 12px 24px; font-size: 15px; }

.btn-white { background: white; color: var(--text); border-color: var(--border); }
.btn-white:hover { background: var(--bg); }

/* ========== 卡片 ========== */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 16px;
    overflow: hidden;
}

.card-header {
    padding: 14px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.card-header h3 {
    font-size: 15px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-header .icon { font-size: 18px; }
.card-header .arrow { transition: transform 0.3s; font-size: 12px; color: var(--text-muted); }
.card-header.collapsed .arrow { transform: rotate(-90deg); }

.card-body {
    padding: 20px;
    display: block;
}

.card-body.hidden { display: none; }

/* ========== 表单 ========== */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 14px;
}

.form-grid-3 { grid-template-columns: repeat(3, 1fr); }
.form-grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
    .form-grid-3, .form-grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
    .form-grid-3, .form-grid-4 { grid-template-columns: 1fr; }
    .form-grid { grid-template-columns: 1fr; }
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.form-group label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input,
.form-group select {
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.2s;
    background: white;
    color: var(--text);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
}

.form-group input[type="range"] {
    padding: 0;
    border: none;
    box-shadow: none;
}

.form-group .hint {
    font-size: 11px;
    color: var(--text-muted);
}

.form-group .unit {
    font-size: 12px;
    color: var(--text-muted);
    margin-left: 4px;
}

.form-divider {
    grid-column: 1 / -1;
    border-top: 1px dashed var(--border);
    margin: 4px 0;
}

.form-section-title {
    grid-column: 1 / -1;
    font-size: 13px;
    font-weight: 700;
    color: var(--primary-dark);
    padding: 4px 0;
}

/* ========== 复选框/开关 ========== */
.toggle-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 8px 0;
}

.toggle-switch {
    position: relative;
    width: 44px;
    height: 24px;
    flex-shrink: 0;
}

.toggle-switch input { display: none; }

.toggle-switch .slider {
    position: absolute;
    inset: 0;
    background: #cbd5e1;
    border-radius: 24px;
    cursor: pointer;
    transition: background 0.3s;
}

.toggle-switch .slider::before {
    content: '';
    position: absolute;
    width: 18px; height: 18px;
    left: 3px; top: 3px;
    background: white;
    border-radius: 50%;
    transition: transform 0.3s;
}

.toggle-switch input:checked + .slider { background: var(--primary); }
.toggle-switch input:checked + .slider::before { transform: translateX(20px); }

/* ========== 结果面板 ========== */
.results-container {
    display: none;
}

.results-container.visible { display: block; }

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 12px;
    margin-bottom: 16px;
}

.stat-card {
    background: var(--card-bg);
    padding: 16px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
    border-left: 3px solid var(--primary);
}

.stat-card.positive { border-left-color: var(--success); }
.stat-card.negative { border-left-color: var(--danger); }
.stat-card.warning { border-left-color: var(--warning); }

.stat-card .stat-value {
    font-size: 22px;
    font-weight: 700;
    color: var(--text);
}

.stat-card .stat-label {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ========== 图表容器 ========== */
.chart-container {
    position: relative;
    height: 350px;
    width: 100%;
    margin: 12px 0;
}

.chart-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

@media (max-width: 768px) {
    .chart-row { grid-template-columns: 1fr; }
}

/* ========== 表格 ========== */
.data-table-wrapper {
    max-height: 500px;
    overflow-y: auto;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 12px;
}

.data-table th {
    background: #f8fafc;
    padding: 10px 8px;
    text-align: right;
    font-weight: 600;
    position: sticky;
    top: 0;
    z-index: 1;
    border-bottom: 2px solid var(--border);
}

.data-table th:first-child,
.data-table td:first-child {
    text-align: center;
    font-weight: 600;
}

.data-table td {
    padding: 6px 8px;
    border-bottom: 1px solid var(--border);
    text-align: right;
    font-variant-numeric: tabular-nums;
    font-family: 'SF Mono', 'Consolas', 'Monaco', monospace;
}

.data-table tr:hover { background: #f1f5f9; }

.data-table .highlight { background: #fef3c7; }
.data-table .negative { color: var(--danger); }

/* ========== Tabs ========== */
.tabs {
    display: flex;
    border-bottom: 2px solid var(--border);
    margin-bottom: 16px;
    gap: 2px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    position: relative;
}
.tabs::-webkit-scrollbar { display: none; }

.tabs::after {
    content: '';
    position: sticky;
    right: 0;
    min-width: 24px;
    background: linear-gradient(to right, transparent, #fff);
    pointer-events: none;
    display: none;
}

.tab {
    padding: 10px 18px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.2s;
    white-space: nowrap;
}

.tab:hover { color: var(--text); }
.tab.active { color: var(--primary); border-bottom-color: var(--primary); }

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ========== 图表容器 ========== */
.chart-container {
    position: relative;
    height: 350px;
    width: 100%;
    margin: 12px 0;
}

.chart-scroll {
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
}

.chart-scroll-inner {
    min-width: 600px;
    height: 350px;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .app-header { flex-direction: column; text-align: center; }
    .app-header h1 { font-size: 20px; }
    .header-actions { justify-content: center; flex-wrap: wrap; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .card-body { padding: 12px; }

    /* 移动端Tab导航：折行+缩小 */
    .tabs { flex-wrap: wrap; gap: 0; }
    .tabs::after { display: none; }
    .tab {
        padding: 7px 11px;
        font-size: 11px;
        border-bottom-width: 3px;
    }

    /* 图表移动端：可滑动 */
    .chart-container {
        height: 280px;
    }
    .chart-scroll-inner {
        height: 280px;
    }
}

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

/* ========== 打印样式 ========== */
@media print {
    .app-header, .header-actions, .btn, .card-header { display: none; }
    .card-body.hidden { display: block !important; }
    .card { break-inside: avoid; box-shadow: none; border: 1px solid #ddd; }
    body { background: white; }
}

/* ========== 工具提示 ========== */
.tooltip {
    position: relative;
    display: inline-flex;
    align-items: center;
}

.tooltip .tip-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px; height: 16px;
    background: var(--text-muted);
    color: white;
    border-radius: 50%;
    font-size: 10px;
    cursor: help;
    margin-left: 4px;
}

.tooltip .tip-text {
    display: none;
    position: absolute;
    bottom: 120%;
    left: 50%;
    transform: translateX(-50%);
    background: #1e293b;
    color: white;
    padding: 6px 10px;
    border-radius: 6px;
    font-size: 11px;
    white-space: nowrap;
    z-index: 10;
}

.tooltip:hover .tip-text { display: block; }

/* ========== 小结横幅 ========== */
.banner {
    padding: 14px 18px;
    border-radius: var(--radius);
    margin: 12px 0;
    font-size: 13px;
    font-weight: 500;
}

.banner-info { background: #eff6ff; border: 1px solid #bfdbfe; color: #1e40af; }
.banner-warning { background: #fffbeb; border: 1px solid #fde68a; color: #92400e; }
.banner-success { background: #f0fdf4; border: 1px solid #bbf7d0; color: #166534; }

/* ========== 进度条 ========== */
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
    margin: 4px 0;
}

.progress-bar .fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.5s;
}

.fill.blue { background: var(--primary); }
.fill.green { background: var(--success); }
.fill.red { background: var(--danger); }
.fill.yellow { background: var(--warning); }

/* ========== 悬浮测算按钮 ========== */
.floating-calc-btn {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 99999;
    display: flex;
    gap: 10px;
    pointer-events: auto;
}
.floating-calc-btn button {
    padding: 14px 28px;
    font-size: 16px;
    font-weight: 700;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    pointer-events: auto;
    box-shadow: 0 8px 24px rgba(59,130,246,0.4);
    transition: all 0.2s;
}
.floating-calc-btn .btn-calc {
    background: #3b82f6;
    color: #fff;
}
.floating-calc-btn .btn-calc:hover {
    background: #2563eb;
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(59,130,246,0.5);
}
.floating-calc-btn .btn-compare {
    background: #fff;
    color: #3b82f6;
    border: 2px solid #3b82f6;
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
}
.floating-calc-btn .btn-compare:hover {
    background: #eff6ff;
    transform: translateY(-2px);
}
@media (max-width: 768px) {
    .floating-calc-btn {
        bottom: 12px;
        right: 12px;
        flex-direction: column;
        gap: 8px;
    }
    .floating-calc-btn button {
        padding: 12px 20px;
        font-size: 14px;
    }
}

/* ========== 成就弹窗 ========== */
.achievement-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.achievement-modal {
    background: #fff;
    border-radius: 16px;
    max-width: 640px;
    width: 90vw;
    max-height: 80vh;
    overflow-y: auto;
    padding: 28px 24px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    animation: slideUp 0.35s ease;
}
@keyframes slideUp { from { transform: translateY(40px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }

.achievement-header {
    text-align: center;
    margin-bottom: 20px;
    position: relative;
}
.achievement-header h2 {
    font-size: 22px;
    color: #1e293b;
    margin: 0 0 6px;
}
.achievement-header p {
    font-size: 13px;
    color: #64748b;
    margin: 0;
}
.achievement-close {
    position: absolute;
    top: -8px;
    right: 0;
    background: #f1f5f9;
    border: none;
    font-size: 16px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    color: #64748b;
    transition: all 0.2s;
}
.achievement-close:hover { background: #e2e8f0; color: #1e293b; }

.achievement-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}
@media (max-width: 480px) {
    .achievement-grid { grid-template-columns: repeat(2, 1fr); }
}

.ach-card {
    padding: 14px 10px;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s;
    border: 2px solid transparent;
}
.ach-card.earned {
    background: linear-gradient(135deg, #fef3c7, #fef9c3);
    border-color: #f59e0b;
    animation: achPop 0.5s ease;
}
@keyframes achPop {
    0% { transform: scale(0.8); opacity: 0; }
    60% { transform: scale(1.05); }
    100% { transform: scale(1); opacity: 1; }
}
.ach-card.locked {
    background: #f8fafc;
    border-color: #e2e8f0;
    opacity: 0.5;
}
.ach-card .ach-icon { font-size: 28px; margin-bottom: 4px; display: block; }
.ach-card .ach-name { font-size: 12px; font-weight: 600; color: #1e293b; margin-bottom: 2px; }
.ach-card .ach-desc { font-size: 10px; color: #94a3b8; }
.ach-card.locked .ach-icon { filter: grayscale(1); }
.ach-card.locked .ach-name { color: #94a3b8; }

.achievement-footer { text-align: center; }
.achievement-footer .btn {
    padding: 10px 32px;
    font-size: 14px;
    border-radius: 8px;
}