/*
 * Tevo 茶饮点餐系统 - 极简黑白灰风格
 * 设计理念：禅意、留白、优雅
 */

/* ==================== 全局样式 ==================== */

:root {
    --color-bg: #ffffff;
    --color-surface: #fafafa;
    --color-border: #e0e0e0;
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #666666;
    --color-text-tertiary: #999999;
    --color-accent: #333333;
    --color-hover: #f5f5f5;
    --color-assistant: #f8f8f8;

    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);

    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", Monaco, Consolas, "Courier New", monospace;
}

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

body {
    font-family: var(--font-sans);
    color: var(--color-text-primary);
    background: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==================== 布局容器 ==================== */

.app-container {
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

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

.header {
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-lg) var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--color-bg);
    position: relative;
    z-index: 10;
}

.header-content {
    text-align: center;
    flex: 1;
}

.logo {
    font-size: 28px;
    font-weight: 300;
    letter-spacing: 0.1em;
    margin-bottom: 4px;
}

.tagline {
    font-size: 13px;
    color: var(--color-text-secondary);
    font-weight: 300;
    letter-spacing: 0.05em;
}

.reset-btn {
    width: 40px;
    height: 40px;
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    color: var(--color-text-secondary);
}

.reset-btn:hover {
    background: var(--color-hover);
    border-color: var(--color-accent);
}

/* ==================== 主体区域 ==================== */

.main-content {
    flex: 1;
    display: flex;
    overflow: hidden;
    position: relative;
}

/* ==================== 聊天区域 ==================== */

.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-width: 0;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl);
    scroll-behavior: smooth;
}

.chat-messages::-webkit-scrollbar {
    width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

.message {
    margin-bottom: var(--spacing-lg);
    display: flex;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-content {
    max-width: 80%;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    line-height: 1.7;
    word-wrap: break-word;
}

.user-message {
    justify-content: flex-end;
}

.user-message .message-content {
    background: var(--color-accent);
    color: var(--color-bg);
}

.assistant-message .message-content {
    background: var(--color-assistant);
    border: 1px solid var(--color-border);
}

/* 打字机效果光标 */
.typing-cursor::after {
    content: '▋';
    animation: blink 1s infinite;
    margin-left: 2px;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

/* ==================== 输入区域 ==================== */

.input-container {
    border-top: 1px solid var(--color-border);
    background: var(--color-bg);
    padding: var(--spacing-md);
}

/* 智能推荐回复 */
.smart-suggestions {
    display: none;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    padding-bottom: 0;
    flex-wrap: wrap;
    animation: slideUp 0.3s ease;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.suggestion-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 1px solid var(--color-border);
    background: linear-gradient(135deg, #fafafa 0%, #ffffff 100%);
    border-radius: var(--radius-lg);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--color-text-primary);
    white-space: nowrap;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.suggestion-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0,0,0,0.03), transparent);
    transition: width 0.4s ease;
}

.suggestion-btn:hover::before {
    width: 100%;
}

.suggestion-btn:hover {
    background: linear-gradient(135deg, #f5f5f5 0%, #fafafa 100%);
    border-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.suggestion-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.suggestion-text {
    font-weight: 400;
}

.input-wrapper {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-end;
}

#userInput {
    flex: 1;
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 14px;
    resize: none;
    max-height: 120px;
    transition: all 0.2s ease;
    background: var(--color-bg);
}

#userInput:focus {
    outline: none;
    border-color: var(--color-accent);
}

#userInput::placeholder {
    color: var(--color-text-tertiary);
}

.send-btn {
    width: 44px;
    height: 44px;
    border: none;
    background: var(--color-accent);
    color: var(--color-bg);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.send-btn:disabled {
    background: var(--color-border);
    cursor: not-allowed;
    opacity: 0.5;
}

.send-btn:not(:disabled):hover {
    background: var(--color-text-primary);
    transform: scale(1.05);
}

/* ==================== 订单侧边栏 ==================== */

.order-sidebar {
    width: 320px;
    border-left: 1px solid var(--color-border);
    background: var(--color-surface);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.order-card {
    display: flex;
    flex-direction: column;
    height: 100%;
}

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

.order-title {
    font-size: 18px;
    font-weight: 400;
}

.order-toggle {
    display: none;
    width: 32px;
    height: 32px;
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    color: var(--color-text-secondary);
}

.order-toggle:hover {
    background: var(--color-hover);
    border-color: var(--color-accent);
}

.order-toggle svg {
    transition: transform 0.3s ease;
}

.order-sidebar.collapsed .order-toggle svg {
    transform: rotate(180deg);
}

.order-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.empty-order {
    text-align: center;
    color: var(--color-text-tertiary);
    padding: var(--spacing-xl);
    font-size: 14px;
}

.order-item {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.order-item-name {
    font-weight: 500;
    margin-bottom: 4px;
}

.order-item-detail {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    color: var(--color-text-secondary);
}

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

.order-total {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 16px;
    margin-bottom: var(--spacing-md);
}

.total-price {
    font-size: 20px;
    font-weight: 500;
}

/* ==================== 弹窗 ==================== */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.modal.show {
    display: flex;
    animation: fadeIn 0.2s ease;
}

.modal-content {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: scaleIn 0.3s ease;
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

.modal-header h3 {
    font-size: 18px;
    font-weight: 500;
}

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    font-size: 28px;
    cursor: pointer;
    color: var(--color-text-secondary);
    line-height: 1;
    transition: color 0.2s ease;
}

.modal-close:hover {
    color: var(--color-text-primary);
}

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

.payment-info {
    text-align: center;
}

.payment-qr {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: var(--spacing-lg) 0;
}

.payment-detail {
    text-align: left;
    background: var(--color-surface);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin: var(--spacing-md) 0;
    font-size: 14px;
    line-height: 1.8;
}

/* ==================== 加载动画 ==================== */

.loading-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    z-index: 999;
    align-items: center;
    justify-content: center;
}

.loading-overlay.show {
    display: flex;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ==================== 响应式设计 ==================== */

@media (max-width: 768px) {
    .header {
        padding: var(--spacing-sm) var(--spacing-md);
        position: sticky;
        top: 0;
        z-index: 20;
        background: var(--color-bg);
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    }

    .logo {
        font-size: 20px;
    }

    .tagline {
        font-size: 11px;
    }

    .reset-btn {
        width: 36px;
        height: 36px;
    }

    .main-content {
        flex-direction: column;
        height: calc(100vh - 70px); /* 减去header高度 */
    }

    .chat-container {
        flex: 1;
        display: flex;
        flex-direction: column;
        min-height: 0;
    }

    .chat-messages {
        flex: 1;
        padding: var(--spacing-md);
        padding-bottom: var(--spacing-sm);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .message {
        margin-bottom: var(--spacing-md);
    }

    .message-content {
        max-width: 85%;
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 14px;
        line-height: 1.6;
    }

    /* 智能推荐回复移动端优化 */
    .smart-suggestions {
        padding: var(--spacing-sm) var(--spacing-md);
        gap: var(--spacing-xs);
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        border-top: none;
    }

    .smart-suggestions::-webkit-scrollbar {
        display: none;
    }

    .suggestion-btn {
        font-size: 13px;
        padding: 10px 16px;
        flex-shrink: 0;
        white-space: nowrap;
        min-width: fit-content;
    }

    /* 输入区域移动端优化 */
    .input-container {
        padding: var(--spacing-sm) var(--spacing-md);
        padding-bottom: max(var(--spacing-sm), env(safe-area-inset-bottom));
        background: var(--color-bg);
        box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.05);
    }

    .input-wrapper {
        gap: var(--spacing-xs);
    }

    #userInput {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 15px;
        max-height: 100px;
        border-radius: var(--radius-lg);
    }

    .send-btn {
        width: 40px;
        height: 40px;
        border-radius: var(--radius-lg);
    }

    /* 订单侧边栏移动端优化 */
    .order-sidebar {
        width: 100%;
        height: auto;
        max-height: 50vh;
        border-left: none;
        border-top: 1px solid var(--color-border);
        transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        position: relative;
        background: var(--color-surface);
        box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.05);
    }

    /* 收起状态 - 只显示标题栏 */
    .order-sidebar.collapsed {
        max-height: 52px;
        overflow: hidden;
        border-top: 1px solid var(--color-border);
        box-shadow: none;
    }

    .order-sidebar.collapsed .order-content,
    .order-sidebar.collapsed .order-footer {
        display: none;
    }

    .order-sidebar.collapsed .order-header {
        border-bottom: none;
    }

    .order-header {
        padding: var(--spacing-md);
        background: var(--color-bg);
        cursor: pointer;
        user-select: none;
        -webkit-tap-highlight-color: transparent;
    }

    .order-header:active {
        background: var(--color-hover);
    }

    .order-title {
        font-size: 15px;
        font-weight: 500;
    }

    .order-toggle {
        display: flex;
        width: 28px;
        height: 28px;
        padding: 0;
    }

    .order-content {
        padding: var(--spacing-sm) var(--spacing-md);
        max-height: calc(50vh - 120px);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .order-item {
        padding: var(--spacing-sm) var(--spacing-md);
        margin-bottom: var(--spacing-xs);
        font-size: 14px;
    }

    .order-item-name {
        font-size: 14px;
        margin-bottom: 2px;
    }

    .order-item-detail {
        font-size: 12px;
    }

    .order-footer {
        padding: var(--spacing-md);
    }

    .order-total {
        font-size: 15px;
    }

    .total-price {
        font-size: 18px;
    }

    /* 弹窗移动端优化 */
    .modal-content {
        width: 92%;
        max-height: 85vh;
        border-radius: var(--radius-lg);
        margin: var(--spacing-md);
    }

    .modal-header {
        padding: var(--spacing-md);
    }

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

    .modal-body {
        padding: var(--spacing-md);
    }

    .payment-qr {
        max-width: 240px;
        margin: var(--spacing-md) auto;
    }

    .payment-detail {
        font-size: 13px;
        padding: var(--spacing-sm);
    }

    /* 加载动画优化 */
    .loading-spinner {
        width: 36px;
        height: 36px;
    }
}

/* ==================== 打印样式 ==================== */

@media print {
    .header,
    .input-container,
    .order-sidebar,
    .modal,
    .loading-overlay {
        display: none !important;
    }

    .chat-container {
        width: 100%;
    }
}