/* ==================== Mobile Order - 移动端样式 ==================== */

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

:root {
    --primary-color: #1890ff;
    --success-color: #52c41a;
    --error-color: #ff4d4f;
    --warning-color: #faad14;
    --text-color: #333;
    --text-secondary: #666;
    --text-light: #999;
    --border-color: #e5e5e5;
    --bg-color: #f5f5f5;
    --bg-white: #fff;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 24px;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

html, body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-color);
    background-color: var(--bg-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

#app {
    min-height: 100vh;
    padding-bottom: 70px;
}

/* ==================== Header ==================== */

.header {
    background: var(--bg-white);
    padding: var(--spacing-lg);
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header h1 {
    font-size: 18px;
    font-weight: 600;
}

/* ==================== Mode Tabs ==================== */

.mode-tabs {
    display: flex;
    background: var(--bg-white);
    padding: var(--spacing-md);
    gap: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-white);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    min-height: 50px;
}

.tab-btn.active {
    border-color: var(--primary-color);
    background: rgba(24, 144, 255, 0.05);
    color: var(--primary-color);
}

.tab-icon {
    font-size: 18px;
}

/* ==================== Main Content ==================== */

.main-content {
    padding: var(--spacing-lg);
}

.mode-content {
    display: none;
}

.mode-content.active {
    display: block;
}

/* ==================== Step Panels ==================== */

.step-panel {
    display: none;
}

.step-panel.active {
    display: block;
}

.step-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-size: 14px;
    font-weight: 600;
}

.step-header h2 {
    flex: 1;
    font-size: 16px;
    font-weight: 600;
}

.back-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: var(--bg-color);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: 13px;
    cursor: pointer;
}

.back-btn:active {
    background: var(--border-color);
}

/* ==================== Selected Info Tags ==================== */

.selected-info {
    margin-bottom: var(--spacing-lg);
    font-size: 14px;
    color: var(--text-secondary);
}

.tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-weight: 500;
    margin-left: var(--spacing-xs);
}

.tag-series {
    background: #e6f7ff;
    color: var(--primary-color);
}

.tag-brand {
    background: #f6ffed;
    color: var(--success-color);
}

.tag-model {
    background: #fff7e6;
    color: var(--warning-color);
}

/* ==================== Option Grid ==================== */

.option-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.option-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    background: var(--bg-white);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    min-height: 60px;
    text-align: center;
}

.option-btn:active {
    transform: scale(0.98);
}

.option-btn.selected {
    border-color: var(--primary-color);
    background: rgba(24, 144, 255, 0.05);
}

/* ==================== Option List (Colors) ==================== */

.option-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.color-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    background: var(--bg-white);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
}

.color-item:active {
    border-color: var(--primary-color);
}

.color-info {
    flex: 1;
}

.color-name {
    font-size: 15px;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.color-code {
    font-size: 12px;
    color: var(--text-light);
}

.add-cart-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    min-height: 36px;
}

.add-cart-btn:active {
    background: #096dd9;
}

.add-cart-btn.added {
    background: var(--success-color);
}

/* ==================== Search Mode ==================== */

.search-box {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.search-box input {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 15px;
    outline: none;
}

.search-box input:focus {
    border-color: var(--primary-color);
}

.btn-search {
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    min-height: 44px;
}

.search-results {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.search-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.search-item-info {
    flex: 1;
}

.search-item-title {
    font-size: 15px;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.search-item-sub {
    font-size: 12px;
    color: var(--text-light);
}

/* ==================== Empty State ==================== */

.empty-state {
    text-align: center;
    padding: calc(var(--spacing-xl) * 2);
    color: var(--text-light);
}

.loading {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-light);
}

/* ==================== Cart Bar ==================== */

.cart-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-white);
    border-top: 1px solid var(--border-color);
    z-index: 1000;
    min-height: 60px;
}

.cart-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

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

.cart-count {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    background: var(--error-color);
    color: white;
    border-radius: 10px;
    font-size: 12px;
    font-weight: 600;
    padding: 0 6px;
}

.btn-checkout {
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    min-height: 44px;
}

.btn-checkout:disabled {
    background: var(--text-light);
    cursor: not-allowed;
}

/* ==================== Modal ==================== */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    align-items: flex-end;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    width: 100%;
    max-height: 90vh;
    background: var(--bg-white);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.modal-close {
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: var(--bg-color);
    border-radius: 50%;
    font-size: 20px;
    color: var(--text-secondary);
    cursor: pointer;
}

.modal-body {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
}

.modal-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* ==================== Checkout Form ==================== */

.checkout-items {
    margin-bottom: var(--spacing-lg);
    max-height: 40vh;
    overflow-y: auto;
}

.checkout-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: var(--bg-color);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.checkout-item-info {
    flex: 1;
}

.checkout-item-name {
    font-size: 14px;
    font-weight: 500;
}

.checkout-item-qty {
    font-size: 12px;
    color: var(--text-secondary);
}

.checkout-item-remove {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: none;
    background: var(--error-color);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 12px;
    cursor: pointer;
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-size: 14px;
    font-weight: 500;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 15px;
    outline: none;
}

.form-group input:focus,
.form-group select:focus {
    border-color: var(--primary-color);
}

.btn-submit {
    width: 100%;
    padding: var(--spacing-lg);
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    min-height: 50px;
}

.btn-submit:disabled {
    background: var(--text-light);
    cursor: not-allowed;
}

.btn-secondary {
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    cursor: pointer;
}

/* ==================== Success Modal ==================== */

.modal-success {
    text-align: center;
    padding: var(--spacing-xl);
    min-height: 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.success-icon {
    font-size: 64px;
    margin-bottom: var(--spacing-lg);
}

.modal-success h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

.modal-success p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.success-hint {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: var(--spacing-xl);
}

.success-actions {
    display: flex;
    gap: var(--spacing-md);
}

/* ==================== Toast ==================== */

.toast {
    position: fixed;
    top: 80px;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--spacing-md) var(--spacing-xl);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    border-radius: var(--radius-md);
    font-size: 14px;
    z-index: 3000;
    opacity: 0;
    transition: opacity 0.3s;
    max-width: 90%;
    text-align: center;
}

.toast.active {
    opacity: 1;
}

.toast.success {
    background: var(--success-color);
}

.toast.error {
    background: var(--error-color);
}

/* ==================== Responsive ==================== */

@media (min-width: 768px) {
    .option-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .modal-content {
        max-width: 500px;
        border-radius: var(--radius-lg);
        margin-bottom: 50px;
    }
}