/* ============================================
   燃油追踪器 - iOS 风格样式
   ============================================ */

:root {
    --bg-primary: #f5f5f7;
    --bg-secondary: #ffffff;
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --accent-color: #007aff;
    --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --danger-color: #ff3b30;
    --warning-color: #ff9500;
    --success-color: #34c759;
    --border-color: #e5e5ea;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    padding-bottom: calc(env(safe-area-inset-bottom) + 20px);
}

/* 顶部导航 */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 4px 16px;
    position: sticky;
    top: 0;
    background: rgba(245, 245, 247, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 100;
    border-bottom: 0.5px solid var(--border-color);
}

.header-left h1 {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.header-right {
    display: flex;
    gap: 8px;
    align-items: center;
}

.btn-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: none;
    background: var(--bg-secondary);
    font-size: 18px;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-icon:active {
    transform: scale(0.95);
    background: var(--border-color);
}

.btn-add {
    padding: 8px 16px;
    border-radius: 20px;
    border: none;
    background: var(--accent-color);
    color: white;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 2px 8px rgba(0, 122, 255, 0.3);
}

.btn-add:active {
    transform: scale(0.96);
}

/* 统计卡片 */
.stats-section {
    padding: 16px;
}

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

.stat-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 16px;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: 12px;
    transition: transform 0.2s;
}

.stat-card:active {
    transform: scale(0.98);
}

.stat-card.stat-primary {
    grid-column: span 2;
    background: var(--accent-gradient);
    color: white;
}

.stat-card.stat-primary .stat-label {
    color: rgba(255,255,255,0.9);
}

.stat-icon {
    font-size: 28px;
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.stat-card.stat-primary .stat-value {
    font-size: 32px;
}

.stat-label {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 2px;
}

/* 保养提醒卡片 */
.maintenance-section {
    padding: 0 16px 16px;
}

.maintenance-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--success-color);
}

.maintenance-card.warning {
    border-left-color: var(--warning-color);
}

.maintenance-card.danger {
    border-left-color: var(--danger-color);
}

.maintenance-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
}

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

.maintenance-title {
    font-size: 17px;
    font-weight: 600;
    flex: 1;
}

.maintenance-badge {
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    background: var(--success-color);
    color: white;
}

.maintenance-card.warning .maintenance-badge {
    background: var(--warning-color);
}

.maintenance-card.danger .maintenance-badge {
    background: var(--danger-color);
}

.maintenance-progress {
    margin-bottom: 16px;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--success-color);
    border-radius: 4px;
    transition: width 0.5s ease;
}

.maintenance-card.warning .progress-fill {
    background: var(--warning-color);
}

.maintenance-card.danger .progress-fill {
    background: var(--danger-color);
}

.progress-text {
    text-align: center;
    margin-top: 8px;
    font-size: 13px;
    color: var(--text-secondary);
}

.maintenance-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 16px;
    padding: 12px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
}

.maint-stat {
    text-align: center;
}

.maint-label {
    display: block;
    font-size: 11px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.maint-value {
    display: block;
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
}

.btn-maintenance {
    width: 100%;
    padding: 12px;
    border-radius: var(--radius-sm);
    border: 2px dashed var(--border-color);
    background: transparent;
    color: var(--accent-color);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-maintenance:active {
    background: var(--bg-primary);
    border-style: solid;
}

/* 图表区域 */
.chart-section {
    padding: 0 16px 16px;
}

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

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.chart-header h3 {
    font-size: 17px;
    font-weight: 600;
}

.chart-tabs {
    display: flex;
    gap: 8px;
    background: var(--bg-primary);
    padding: 3px;
    border-radius: 8px;
}

.tab-btn {
    padding: 6px 14px;
    border: none;
    background: transparent;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.tab-btn.active {
    background: var(--bg-secondary);
    color: var(--accent-color);
    box-shadow: var(--shadow-sm);
}

.chart-container {
    position: relative;
    height: 250px;
}

/* 记录列表 */
.records-section {
    padding: 0 16px 16px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 8px;
}

.section-header h2 {
    font-size: 20px;
    font-weight: 700;
}

.filter-group {
    display: flex;
    gap: 8px;
}

.filter-group select {
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 13px;
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.records-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.record-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 16px;
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.record-card:active {
    transform: scale(0.98);
}

.record-card.full-tank {
    border-left-color: var(--success-color);
}

.record-card:not(.full-tank) {
    border-left-color: var(--warning-color);
}

.record-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.record-station {
    font-size: 15px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
}

.record-date {
    font-size: 13px;
    color: var(--text-secondary);
}

.record-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
}

.detail-item {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
}

.detail-label {
    color: var(--text-secondary);
}

.detail-value {
    font-weight: 500;
}

.record-consumption {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.consumption-badge {
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    background: #e8f5e9;
    color: #2e7d32;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-icon {
    font-size: 64px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state p {
    margin-bottom: 8px;
}

.empty-hint {
    font-size: 13px;
    opacity: 0.7;
}

/* 弹窗样式 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    display: none;
    align-items: flex-end;
    justify-content: center;
    animation: fadeIn 0.2s ease;
}

.modal-overlay.active {
    display: flex;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    width: 100%;
    max-width: 540px;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease;
    padding-bottom: env(safe-area-inset-bottom);
}

.modal-content.modal-sm {
    max-height: 80vh;
}

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

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 20px 16px;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background: var(--bg-secondary);
    z-index: 1;
}

.modal-header h2 {
    font-size: 19px;
    font-weight: 700;
}

.btn-close {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: none;
    background: var(--bg-primary);
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 表单样式 */
form {
    padding: 20px;
}

.form-group {
    margin-bottom: 16px;
}

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 16px;
    background: var(--bg-primary);
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
}

.input-with-button {
    display: flex;
    gap: 8px;
}

.input-with-button input {
    flex: 1;
}

.btn-small {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    font-size: 20px;
    cursor: pointer;
    flex-shrink: 0;
}

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

.form-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.btn-cancel,
.btn-submit,
.btn-edit,
.btn-delete {
    flex: 1;
    padding: 14px;
    border-radius: var(--radius-sm);
    border: none;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-cancel {
    background: var(--bg-primary);
    color: var(--text-primary);
}

.btn-submit {
    background: var(--accent-color);
    color: white;
    box-shadow: 0 2px 8px rgba(0, 122, 255, 0.3);
}

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

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

.btn-cancel:active,
.btn-submit:active,
.btn-edit:active,
.btn-delete:active {
    transform: scale(0.98);
}

/* 备份选项 */
.backup-options {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.backup-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
}

.backup-btn:active {
    background: var(--bg-primary);
    transform: scale(0.98);
}

.backup-icon {
    font-size: 28px;
}

.backup-btn span {
    display: block;
}

.backup-btn small {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 2px;
}

/* Toast 提示 */
.toast {
    position: fixed;
    top: 80px;
    left: 50%;
    transform: translateX(-50%);
    padding: 12px 24px;
    background: rgba(0,0,0,0.85);
    color: white;
    border-radius: 24px;
    font-size: 14px;
    font-weight: 500;
    z-index: 2000;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
}

/* 详情内容 */
#detailContent {
    padding: 20px;
}

.detail-row {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 15px;
}

.detail-row:last-child {
    border-bottom: none;
}

/* 响应式适配 */
@media (max-width: 380px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .stat-card.stat-primary {
        grid-column: span 1;
    }

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

    .record-details {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 768px) {
    .modal-content {
        border-radius: var(--radius-lg);
        margin: auto;
    }
}

/* 安全区域适配（iPhone X+） */
@supports (padding: env(safe-area-inset-bottom)) {
    .modal-content {
        padding-bottom: calc(env(safe-area-inset-bottom) + 20px);
    }
}