/* 公共样式文件 */

/* ==================== CSS变量定义 ==================== */
:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-success: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    --gradient-warning: linear-gradient(135deg, #ffc107 0%, #ff8c00 100%);
    --gradient-danger: linear-gradient(135deg, #dc3545 0%, #c82333 100%);
    --gradient-info: linear-gradient(135deg, #17a2b8 0%, #138496 100%);
    
    --border-radius: 12px;
    --box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    --box-shadow-hover: 0 15px 35px rgba(0,0,0,0.15);
    --transition: all 0.3s ease;
    --transition-fast: all 0.15s ease;
    
    --font-family: 'PingFang SC', 'Helvetica Neue', 'Microsoft YaHei', sans-serif;
}

/* ==================== 全局重置 ==================== */
* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #f8f9fa;
}

/* ==================== 通用工具类 ==================== */
.gradient-primary { background: var(--gradient-primary); }
.gradient-success { background: var(--gradient-success); }
.gradient-warning { background: var(--gradient-warning); }
.gradient-danger { background: var(--gradient-danger); }
.gradient-info { background: var(--gradient-info); }

.shadow-custom { box-shadow: var(--box-shadow); }
.shadow-hover:hover { box-shadow: var(--box-shadow-hover); }

.transition { transition: var(--transition); }
.transition-fast { transition: var(--transition-fast); }

.border-radius { border-radius: var(--border-radius); }

/* ==================== 按钮增强 ==================== */
.btn {
    border-radius: 8px;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn:active {
    transform: translateY(0);
}

.btn-gradient-primary {
    background: var(--gradient-primary);
    border: none;
    color: white;
}

.btn-gradient-primary:hover {
    color: white;
    box-shadow: 0 8px 16px rgba(102, 126, 234, 0.3);
}

.btn-gradient-success {
    background: var(--gradient-success);
    border: none;
    color: white;
}

.btn-gradient-success:hover {
    color: white;
    box-shadow: 0 8px 16px rgba(40, 167, 69, 0.3);
}

/* ==================== 卡片增强 ==================== */
.card {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow-hover);
}

.card-header {
    border-bottom: 1px solid rgba(0,0,0,0.125);
    border-radius: var(--border-radius) var(--border-radius) 0 0 !important;
}

/* ==================== 表单增强 ==================== */
.form-control {
    border: 2px solid #e9ecef;
    border-radius: 8px;
    transition: var(--transition);
    font-size: 0.95rem;
    padding: 0.75rem 1rem;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.form-select {
    border: 2px solid #e9ecef;
    border-radius: 8px;
    transition: var(--transition);
}

.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

/* ==================== 导航栏增强 ==================== */
.navbar {
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    backdrop-filter: blur(10px);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.25rem;
}

.nav-link {
    transition: var(--transition-fast);
    border-radius: 6px;
    margin: 0 0.25rem;
}

.nav-link:hover {
    background: rgba(255,255,255,0.1);
    transform: translateY(-1px);
}

/* ==================== 模态框增强 ==================== */
.modal-content {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}

.modal-header {
    border-bottom: 1px solid rgba(0,0,0,0.125);
}

.modal-footer {
    border-top: 1px solid rgba(0,0,0,0.125);
}

/* ==================== Toast通知增强 ==================== */
.toast {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    backdrop-filter: blur(10px);
}

.toast-success {
    background: rgba(40, 167, 69, 0.95);
    color: white;
}

.toast-error {
    background: rgba(220, 53, 69, 0.95);
    color: white;
}

.toast-warning {
    background: rgba(255, 193, 7, 0.95);
    color: #212529;
}

.toast-info {
    background: rgba(23, 162, 184, 0.95);
    color: white;
}

/* ==================== 加载动画 ==================== */
.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(102, 126, 234, 0.3);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-dots::after {
    content: '';
    animation: dots 2s infinite;
}

@keyframes dots {
    0%, 20% { content: ''; }
    40% { content: '.'; }
    60% { content: '..'; }
    80%, 100% { content: '...'; }
}

/* ==================== 进度条增强 ==================== */
.progress {
    border-radius: 10px;
    height: 8px;
    background: rgba(102, 126, 234, 0.1);
}

.progress-bar {
    border-radius: 10px;
    background: var(--gradient-primary);
    transition: width 0.6s ease;
}

/* ==================== 徽章增强 ==================== */
.badge {
    border-radius: 6px;
    font-weight: 500;
    padding: 0.5em 0.75em;
}

/* ==================== 用户头像 ==================== */
.user-avatar {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 0.9rem;
}

.user-avatar.large {
    width: 60px;
    height: 60px;
    font-size: 1.2rem;
}

.user-avatar.small {
    width: 30px;
    height: 30px;
    font-size: 0.8rem;
}

/* ==================== 空状态 ==================== */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
}

.empty-state i {
    font-size: 4rem;
    color: #dee2e6;
    margin-bottom: 1rem;
}

.empty-state h5 {
    color: #6c757d;
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: #adb5bd;
}

/* ==================== 错误状态 ==================== */
.error-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--danger-color);
}

.error-state i {
    font-size: 4rem;
    margin-bottom: 1rem;
}

/* ==================== 滚动条美化 ==================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(0,0,0,0.05);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

/* ==================== 移动端特定优化 ==================== */

/* 触摸优化 */
@media (pointer: coarse) {
    .btn {
        min-height: 44px; /* Apple HIG推荐的最小触摸目标 */
        min-width: 44px;
    }
    
    .form-control, .form-select {
        min-height: 44px;
        font-size: 16px; /* 防止iOS Safari自动缩放 */
    }
    
    /* 增大点击区域 */
    .clickable {
        padding: 0.75rem;
        margin: 0.25rem;
    }
}

/* 禁用移动端长按选择 */
.no-select {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
}

/* 触摸反馈 */
.touch-feedback {
    -webkit-tap-highlight-color: rgba(102, 126, 234, 0.3);
    transition: background-color 0.15s ease;
}

.touch-feedback:active {
    background-color: rgba(102, 126, 234, 0.1);
    transform: scale(0.98);
}

/* 安全区域适配 (iPhone X等) */
@supports (padding: max(0px)) {
    .safe-area-inset-top {
        padding-top: max(1rem, env(safe-area-inset-top));
    }
    
    .safe-area-inset-bottom {
        padding-bottom: max(1rem, env(safe-area-inset-bottom));
    }
    
    .safe-area-inset-left {
        padding-left: max(1rem, env(safe-area-inset-left));
    }
    
    .safe-area-inset-right {
        padding-right: max(1rem, env(safe-area-inset-right));
    }
}

/* 横屏适配 */
@media screen and (orientation: landscape) and (max-height: 600px) {
    .flip-card {
        height: min(320px, 80vh) !important;
    }
    
    .controls {
        position: fixed !important;
        bottom: 5px !important;
        padding: 0.5rem !important;
    }
    
    .progress-indicator {
        top: 5px !important;
        padding: 0.5rem 1rem !important;
    }
    
    .tts-controls {
        top: 5px !important;
        right: 5px !important;
    }
}

/* PWA专用样式 */
@media all and (display-mode: standalone) {
    .standalone-only {
        display: block !important;
    }
    
    .browser-only {
        display: none !important;
    }
    
    /* 状态栏适配 */
    body {
        padding-top: env(safe-area-inset-top);
    }
}

/* 网络状态指示 */
.offline-indicator {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: #ff6b6b;
    color: white;
    text-align: center;
    padding: 0.5rem;
    transform: translateY(-100%);
    transition: transform 0.3s ease;
    z-index: 9999;
}

.offline-indicator.show {
    transform: translateY(0);
}

/* ==================== 响应式工具类 ==================== */

/* 大屏平板 */
@media (max-width: 1024px) and (min-width: 769px) {
    .tablet-hidden {
        display: none !important;
    }
    
    .tablet-full-width {
        width: 100% !important;
    }
    
    .tablet-text-center {
        text-align: center !important;
    }
}

/* 平板设备 */
@media (max-width: 768px) and (min-width: 481px) {
    .tablet-sm-hidden {
        display: none !important;
    }
    
    .tablet-sm-full-width {
        width: 100% !important;
    }
    
    .tablet-sm-text-center {
        text-align: center !important;
    }
    
    .tablet-sm-flex-column {
        flex-direction: column !important;
    }
}

/* 手机设备 */
@media (max-width: 480px) {
    .mobile-hidden {
        display: none !important;
    }
    
    .mobile-full-width {
        width: 100% !important;
    }
    
    .mobile-text-center {
        text-align: center !important;
    }
    
    .mobile-flex-column {
        flex-direction: column !important;
    }
    
    .mobile-gap-sm {
        gap: 0.5rem !important;
    }
    
    .mobile-p-sm {
        padding: 0.5rem !important;
    }
    
    .mobile-m-sm {
        margin: 0.5rem !important;
    }
    
    .mobile-font-sm {
        font-size: 0.875rem !important;
    }
}

/* 小屏手机 */
@media (max-width: 375px) {
    .mobile-xs-hidden {
        display: none !important;
    }
    
    .mobile-xs-full-width {
        width: 100% !important;
    }
    
    .mobile-xs-text-center {
        text-align: center !important;
    }
    
    .mobile-xs-font-xs {
        font-size: 0.75rem !important;
    }
}

@media (min-width: 769px) {
    .desktop-hidden {
        display: none !important;
    }
}

/* ==================== 动画工具类 ==================== */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

.slide-in-left {
    animation: slideInLeft 0.5s ease-out;
}

@keyframes slideInLeft {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

.slide-in-right {
    animation: slideInRight 0.5s ease-out;
}

@keyframes slideInRight {
    from { transform: translateX(100%); }
    to { transform: translateX(0); }
}

.bounce-in {
    animation: bounceIn 0.6s ease-out;
}

@keyframes bounceIn {
    0% { transform: scale(0.3); opacity: 0; }
    50% { transform: scale(1.05); }
    70% { transform: scale(0.9); }
    100% { transform: scale(1); opacity: 1; }
}

.shake {
    animation: shake 0.6s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

/* ==================== 无障碍增强 ==================== */
.focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ==================== 打印样式 ==================== */
@media print {
    .no-print {
        display: none !important;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #dee2e6;
    }
    
    .btn {
        background: none !important;
        color: #000 !important;
        border: 1px solid #000 !important;
    }
}

/* ==================== 深色主题支持 ==================== */
@media (prefers-color-scheme: dark) {
    :root {
        --dark-color: #e9ecef;
        --light-color: #343a40;
    }
    
    body {
        background-color: #1a1a1a;
        color: #e9ecef;
    }
    
    .card {
        background-color: #2d3748;
        color: #e9ecef;
    }
    
    .form-control,
    .form-select {
        background-color: #2d3748;
        border-color: #4a5568;
        color: #e9ecef;
    }
    
    .form-control:focus,
    .form-select:focus {
        background-color: #2d3748;
        border-color: var(--primary-color);
        color: #e9ecef;
    }
}

/* ==================== 高对比度支持 ==================== */
@media (prefers-contrast: high) {
    .btn {
        border: 2px solid;
    }
    
    .card {
        border: 2px solid #000;
    }
    
    .form-control,
    .form-select {
        border: 2px solid #000;
    }
}