/* 基础样式 */
html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    overflow-x: hidden;
    font-family: 'Inter', 'system-ui', sans-serif;
}

::selection {
    background-color: rgba(76, 175, 80, 0.3);
    color: #1f2937;
}

/* 自定义滚动条 */
.custom-scrollbar::-webkit-scrollbar {
    width: 6px;
}

.custom-scrollbar::-webkit-scrollbar-track {
    background: #f1f5f9;
    border-radius: 3px;
}

.custom-scrollbar::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 3px;
}

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

/* 自定义工具类 */
.text-shadow {
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.text-gradient {
    background: linear-gradient(90deg, #4CAF50, #1a73e8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.glass-effect {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.card-hover {
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.card-hover:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.gradient-bg {
    background: linear-gradient(135deg, #4CAF50 0%, #1a73e8 50%, #ea4335 100%);
    background-size: 200% 200%;
    animation: gradientX 15s ease infinite;
}

.gradient-bg-light {
    background: linear-gradient(135deg, #f0f9f0 0%, #eff6ff 50%, #fef2f2 100%);
}

.section-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(76, 175, 80, 0.3), transparent);
    margin: 4rem auto;
    max-width: 800px;
}

.feature-icon {
    position: relative;
    z-index: 1;
}

.feature-icon::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 70px;
    height: 70px;
    background: rgba(76, 175, 80, 0.1);
    border-radius: 50%;
    z-index: -1;
}

.staggered-animation > * {
    opacity: 0;
    animation: fadeIn 0.8s ease-out forwards;
}

.staggered-animation > *:nth-child(1) { animation-delay: 0.1s; }
.staggered-animation > *:nth-child(2) { animation-delay: 0.2s; }
.staggered-animation > *:nth-child(3) { animation-delay: 0.3s; }
.staggered-animation > *:nth-child(4) { animation-delay: 0.4s; }
.staggered-animation > *:nth-child(5) { animation-delay: 0.5s; }
.staggered-animation > *:nth-child(6) { animation-delay: 0.6s; }

.scroll-indicator {
    width: 30px;
    height: 50px;
    border: 2px solid rgba(255, 255, 255, 0.7);
    border-radius: 25px;
    position: relative;
    margin: 0 auto;
}

.scroll-indicator::after {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 10px;
    background-color: rgba(255, 255, 255, 0.7);
    border-radius: 2px;
    animation: scrollAnimation 2s infinite;
}

@keyframes scrollAnimation {
    0% { top: 10px; opacity: 1; }
    100% { top: 30px; opacity: 0; }
}

.typewriter {
    overflow: hidden;
    border-right: 2px solid #4CAF50;
    white-space: nowrap;
    margin: 0 auto;
    animation: typing 3.5s steps(40, end), blink-caret 0.75s step-end infinite;
}

@keyframes typing {
    from { width: 0 }
    to { width: 100% }
}

@keyframes blink-caret {
    from, to { border-color: transparent }
    50% { border-color: #4CAF50; }
}

.chat-bubble {
    position: relative;
    background: #f1f5f9;
    border-radius: 1rem;
    padding: 1rem;
    max-width: 80%;
    margin: 1rem 0;
}

.chat-bubble::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 20px;
    border-width: 10px 10px 0;
    border-style: solid;
    border-color: #f1f5f9 transparent;
}

.directory-tree {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
}

.directory-item {
    padding-left: 1.5rem;
    position: relative;
}

.directory-item::before {
    content: '├── ';
    position: absolute;
    left: 0;
    color: #6b7280;
}

.directory-item:last-child::before {
    content: '└── ';
}

.file-badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 600;
    margin-left: 0.5rem;
}

/* 关键帧动画 */
@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

@keyframes fadeIn {
    0% { opacity: 0; }
    100% { opacity: 1; }
}

@keyframes slideUp {
    0% { opacity: 0; transform: translateY(30px); }
    100% { opacity: 1; transform: translateY(0); }
}

@keyframes gradientX {
    0%, 100% { background-position: 0% 50%; }
    50% { backgroundPosition: 100% 50%; }
}

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

/* 视频播放器自定义样式 */
.video-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 比例 */
    height: 0;
    overflow: hidden;
    border-radius: 12px;
    background: #000;
}

.video-container video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: #f8fafc;
    border-radius: 0 0 12px 12px;
}

video::-webkit-media-controls-panel {
    background: rgba(0, 0, 0, 0.7);
}

video::-webkit-media-controls-play-button,
video::-webkit-media-controls-mute-button {
    filter: brightness(0) invert(1);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .directory-tree {
        font-size: 0.8rem;
    }
}

/* 加载动画 */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(76, 175, 80, 0.3);
    border-radius: 50%;
    border-top-color: #4CAF50;
    animation: spin 1s ease-in-out infinite;
}

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

/* 进度条 */
.progress-bar {
    width: 100%;
    height: 6px;
    background-color: #e5e7eb;
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #4CAF50, #1a73e8);
    border-radius: 3px;
    transition: width 0.3s ease;
}