/* 公共样式文件 - 计算机考研学习平台 */

/* 基础重置和设置 */
* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
}

/* 通用背景渐变样式 */
.hero-bg {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.hero-bg-green {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.hero-bg-purple {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
}

.hero-bg-blue {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
}

/* 卡片悬停效果 - 统一版本 */
.card-hover {
    transition: all 0.3s ease;
}

.card-hover:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.question-card {
    background: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
}

.option-button {
    transition: all 0.2s ease;
}

.option-button:hover {
    transform: scale(1.02);
}

.option-selected {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    color: white;
}

.option-correct {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
}

.option-wrong {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: white;
}

.timer {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

/* 进度条样式 */
.progress-bar {
    background: linear-gradient(90deg, #10b981 0%, #34d399 100%);
    transition: width 0.5s ease;
}

/* 章节项悬停效果 */
.chapter-item {
    transition: all 0.2s ease;
}

.chapter-item:hover {
    background: linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 100%);
}

/* Toast 通知样式 */
.toast {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 9999;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    color: white;
    font-weight: 500;
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(-20px);
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.toast.success {
    background-color: #10b981;
}

.toast.error {
    background-color: #ef4444;
}

.toast.info {
    background-color: #3b82f6;
}

.toast.warning {
    background-color: #f59e0b;
}

/* 难度标签样式 */
.difficulty-easy {
    background-color: #dcfce7;
    color: #166534;
}

.difficulty-medium {
    background-color: #fef3c7;
    color: #92400e;
}

.difficulty-hard {
    background-color: #fee2e2;
    color: #991b1b;
}

/* 动画效果 */
.fade-in {
    animation: fadeIn 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.fade-in-up {
    animation: fadeInUp 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.fade-in-down {
    animation: fadeInDown 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.slide-in {
    animation: slideIn 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.slide-in-right {
    animation: slideInRight 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.bounce-in {
    animation: bounceIn 0.8s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.scale-in {
    animation: scaleIn 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }
.stagger-5 { animation-delay: 0.5s; }

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* 页面切换动画 */
.page-transition {
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.page-enter {
    opacity: 0;
    transform: translateX(100px) scale(0.98);
}

.page-enter-active {
    opacity: 1;
    transform: translateX(0) scale(1);
}

.page-leave {
    opacity: 1;
    transform: translateX(0) scale(1);
}

.page-leave-active {
    opacity: 0;
    transform: translateX(-100px) scale(0.98);
}

/* 微交互动画 */
.pulse-gentle {
    animation: pulseGentle 2s ease-in-out infinite;
}

@keyframes pulseGentle {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.02);
        opacity: 0.9;
    }
}

.float {
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* 按钮点击反馈 */
.button-press {
    transition: all 0.1s ease;
}

.button-press:active {
    transform: scale(0.95);
}

/* 加载动画 */
.loading-spinner {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.loading-dots {
    animation: loadingDots 1.4s ease-in-out infinite;
}

@keyframes loadingDots {
    0%, 80%, 100% {
        transform: scale(0);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

/* 响应式工具类 */
.container-custom {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

@media (min-width: 768px) {
    .container-custom {
        padding: 0 2rem;
    }
}

/* 移动端优化 */
@media (max-width: 768px) {
    .card-hover {
        padding: 1rem;
        margin-bottom: 0.5rem;
    }
    
    .card-hover:hover {
        transform: translateY(-3px) scale(1.02);
    }
    
    .hero-bg {
        padding: 2rem 1rem;
    }
    
    /* 移动端动画优化 */
    .fade-in-up {
        animation-duration: 0.5s;
    }
    
    .float {
        animation-duration: 4s;
    }
    
    /* 触摸友好的按钮 */
    button, .button-press {
        min-height: 44px;
        min-width: 44px;
    }
    
    /* 移动端文字大小调整 */
    .text-3xl {
        font-size: 1.75rem;
    }
    
    .text-4xl {
        font-size: 2rem;
    }
    
    /* 移动端间距调整 */
    .py-16 {
        padding-top: 3rem;
        padding-bottom: 3rem;
    }
    
    .mb-12 {
        margin-bottom: 2rem;
    }
    
    /* 移动端网格调整 */
    .grid {
        gap: 1rem;
    }
    
    /* 移动端模态框优化 */
    .welcome-modal {
        margin: 1rem;
        padding: 1.5rem;
    }
}

/* 超小屏幕优化 */
@media (max-width: 480px) {
    .container-custom {
        padding: 0 0.75rem;
    }
    
    .card-hover {
        padding: 0.75rem;
    }
    
    .text-xl {
        font-size: 1.125rem;
    }
    
    .text-2xl {
        font-size: 1.25rem;
    }
    
    .welcome-modal {
        margin: 0.5rem;
        padding: 1rem;
    }
    
    /* 更小的图标 */
    .text-6xl {
        font-size: 3rem;
    }
    
    .text-4xl {
        font-size: 1.75rem;
    }
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .card-hover:hover {
        transform: none;
        box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    }
    
    .card-hover:active {
        transform: scale(0.98);
        transition: transform 0.1s ease;
    }
    
    .button-press:active {
        transform: scale(0.95);
    }
    
    /* 禁用不必要的悬停动画 */
    .float {
        animation: none;
    }
    
    .pulse-gentle {
        animation: none;
    }
}

/* 减少动画的媒体查询 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .fade-in,
    .fade-in-up,
    .fade-in-down,
    .slide-in,
    .slide-in-right,
    .bounce-in,
    .scale-in,
    .float,
    .pulse-gentle {
        animation: none;
    }
}

/* 自定义滚动条 */
.custom-scrollbar::-webkit-scrollbar {
    width: 8px;
}

.custom-scrollbar::-webkit-scrollbar-track {
    background: #f1f5f9;
    border-radius: 4px;
}

.custom-scrollbar::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

.custom-scrollbar::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* 深色模式优化样式 */
.dark-mode-enhanced {
    /* 主要背景色 - 更深的黑色 */
    background-color: #0f1419;
    color: #e5e7eb;
}

.dark-bg-primary { background-color: #0f1419; }  /* 最深背景 */
.dark-bg-secondary { background-color: #1a1f2e; }  /* 次级背景 */
.dark-bg-tertiary { background-color: #252a3a; }   /* 第三级背景 */
.dark-bg-card { background-color: #1e2432; }       /* 卡片背景 */
.dark-bg-elevated { background-color: #2a2f3e; }   /* 浮起元素背景 */

.dark-text-primary { color: #f8fafc; }     /* 主要文字 */
.dark-text-secondary { color: #cbd5e1; }   /* 次要文字 */
.dark-text-muted { color: #94a3b8; }       /* 淡化文字 */
.dark-text-disabled { color: #64748b; }    /* 禁用文字 */

.dark-border-primary { border-color: #374151; }   /* 主要边框 */
.dark-border-secondary { border-color: #4b5563; } /* 次要边框 */

/* 深色模式下的阴影 */
.dark-shadow-sm { box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.8); }
.dark-shadow { box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.6), 0 1px 2px 0 rgba(0, 0, 0, 0.5); }
.dark-shadow-lg { box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.7), 0 4px 6px -2px rgba(0, 0, 0, 0.5); }
.dark-shadow-xl { box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.8), 0 10px 10px -5px rgba(0, 0, 0, 0.6); }

/* 深色模式下的渐变 */
.dark-gradient-primary {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
}

.dark-gradient-secondary {
    background: linear-gradient(135deg, #374151 0%, #1f2937 100%);
}

.dark-gradient-card {
    background: linear-gradient(145deg, #1e2432 0%, #1a1f2e 100%);
}

/* 深色模式下的悬停效果 */
.dark-hover-bg:hover {
    background-color: #2d3748;
}

.dark-hover-elevated:hover {
    background-color: #3a4553;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.5);
}

/* 深色模式专用组件样式 */
.dark-card {
    background: linear-gradient(145deg, #1e2432 0%, #1a1f2e 100%);
    border: 1px solid #374151;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.6);
}

.dark-input {
    background-color: #1a1f2e;
    border-color: #374151;
    color: #f8fafc;
}

.dark-input:focus {
    background-color: #1e2432;
    border-color: #4f46e5;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.dark-button-primary {
    background: linear-gradient(135deg, #4f46e5 0%, #3730a3 100%);
    color: #f8fafc;
    box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.3);
}

.dark-button-primary:hover {
    background: linear-gradient(135deg, #5b51f0 0%, #4338ca 100%);
    box-shadow: 0 6px 8px -1px rgba(79, 70, 229, 0.4);
}

.dark-button-secondary {
    background: linear-gradient(135deg, #374151 0%, #1f2937 100%);
    color: #e5e7eb;
    border: 1px solid #4b5563;
}

.dark-button-secondary:hover {
    background: linear-gradient(135deg, #4b5563 0%, #374151 100%);
}

/* 深色模式下的滚动条 */
.dark-scrollbar::-webkit-scrollbar {
    width: 8px;
}

.dark-scrollbar::-webkit-scrollbar-track {
    background: #1a1f2e;
    border-radius: 4px;
}

.dark-scrollbar::-webkit-scrollbar-thumb {
    background: #4b5563;
    border-radius: 4px;
}

.dark-scrollbar::-webkit-scrollbar-thumb:hover {
    background: #6b7280;
}

/* 深色模式下的特殊效果 */
.dark-glow {
    box-shadow: 0 0 20px rgba(79, 70, 229, 0.2);
}

.dark-glow-green {
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.2);
}

.dark-glow-red {
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.2);
}

/* 深色模式切换动画 */
.dark-mode-transition {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* 深色模式下的代码块 */
.dark-code {
    background-color: #0d1117;
    color: #f0f6fc;
    border: 1px solid #30363d;
}

/* 深色模式下的表格 */
.dark-table {
    background-color: #1a1f2e;
    border-color: #374151;
}

.dark-table-row:nth-child(even) {
    background-color: #1e2432;
}

.dark-table-row:hover {
    background-color: #252a3a;
}
/*/学习模块*/
.card-hover:hover {
    transform: translateY(-6px) scale(1.03);
    box-shadow: 0 10px 30px rgba(99,102,241,0.14);
    transition: all 0.2s cubic-bezier(.4,0,.2,1);
}
.chapter-hover:hover {
    background: linear-gradient(90deg, #e0e7ff 0%, #f1f5f9 100%);
}