:root {
    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    --color-secondary: #8b5cf6;
    --color-secondary-hover: #7c3aed;
    --color-text: #1f2937;
    --color-text-light: #4b5563;
    --color-text-lighter: #9ca3af;
    --color-background: #ffffff;
    --color-background-alt: #f9fafb;
    --color-border: #e5e7eb;
    --color-card-bg: #ffffff;
    --color-card-border: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --color-foreground: #f9fafb;
    --color-primary-dark: #2563eb;
    --color-card-shadow: rgba(0, 0, 0, 0.1);
}

.dark {
    --color-primary: #3b82f6;
    --color-primary-hover: #60a5fa;
    --color-secondary: #8b5cf6;
    --color-secondary-hover: #a78bfa;
    --color-text: #f9fafb;
    --color-text-light: #d1d5db;
    --color-text-lighter: #9ca3af;
    --color-background: #111827;
    --color-background-alt: #1f2937;
    --color-border: #374151;
    --color-card-bg: #1f2937;
    --color-card-border: #374151;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    --color-foreground: #1f2937;
    --color-primary-dark: #60a5fa;
    --color-card-shadow: rgba(0, 0, 0, 0.5);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--color-text);
    background-color: var(--color-background);
    line-height: 1.5;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.header-blur {
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background-color: var(--color-primary);
    color: white;
    padding: 8px;
    z-index: 100;
    transition: top 0.3s;
}

.skip-link:focus {
    top: 0;
}

.card {
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.gradient-text {
    background: linear-gradient(90deg, #3b82f6, #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
}

.dark .gradient-text {
    background: linear-gradient(90deg, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
}

.nav-link {
    position: relative;
    color: var(--color-text-light);
    text-decoration: none;
    padding: 0.5rem 0;
    transition: color 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--color-primary);
    transition: width 0.3s ease;
}

.nav-link:hover {
    color: var(--color-text);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link.active {
    color: var(--color-primary);
    font-weight: 500;
}

.mobile-nav-menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-background);
    z-index: 50;
    padding: 1.5rem;
    overflow-y: auto;
}

/* Side Navigation */
.side-nav {
    position: fixed;
    top: 50%;
    right: 2rem;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    z-index: 10;
    gap: 1rem;
}

.side-nav-link {
    position: relative;
    color: var(--color-text-lighter);
    text-decoration: none;
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
    transition: all 0.3s ease;
    border-radius: 4px;
}

.side-nav-link::after {
    content: '';
    position: absolute;
    width: 3px;
    height: 0;
    top: 50%;
    right: -8px;
    transform: translateY(-50%);
    background-color: var(--color-primary);
    transition: height 0.3s ease;
}

.side-nav-link:hover,
.side-nav-link.active {
    color: var(--color-primary);
}

.side-nav-link.active::after {
    height: 100%;
}

@media (max-width: 768px) {
    .side-nav {
        display: none;
    }
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.6s ease-out forwards;
}

.delay-1 {
    animation-delay: 0.2s;
}

.delay-2 {
    animation-delay: 0.4s;
}

.delay-3 {
    animation-delay: 0.6s;
}

.delay-4 {
    animation-delay: 0.8s;
}

.delay-5 {
    animation-delay: 1s;
}

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

/* Custom Styles for Examples Page */
.improved-metric-card {
    background-color: var(--color-card-bg);
    border-radius: 0.75rem;
    border: 1px solid var(--color-border);
    padding: 1rem;
    transition: all 0.3s ease;
}

.improved-metric-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

pre {
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    background-color: var(--color-background-alt);
    border-radius: 4px;
    overflow-x: auto;
    position: relative;
}

code {
    display: block;
    padding: 1rem;
}

/* Form Elements */
select {
    appearance: auto;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.5rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    padding-right: 2.5rem;
}

.dark select {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%23d1d5db' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    color: var(--color-text);
    background-color: var(--color-background-alt);
    border-color: var(--color-border);
}

/* Theme Toggle Button */
.theme-toggle {
    cursor: pointer;
    transition: all 0.3s ease;
}

/* Project modal styles */
.project-modal-overlay {
    transition: opacity 0.3s ease;
}

.project-modal {
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.95);
    opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.project-modal-overlay:not(.hidden) .project-modal {
    transform: scale(1);
    opacity: 1;
}

.qrcode-container {
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* 复制按钮交互样式 */
#copyProjectSubmitBtn {
    transition: all 0.2s ease;
}

#copyProjectSubmitBtn:hover {
    transform: scale(1.1);
}

#projectSubmitText {
    min-height: 150px;
    font-size: 0.875rem;
}

/* 移动端适配 */
@media (max-width: 640px) {
    .project-modal {
        max-width: 90%;
    }
    
    .qrcode-container {
        width: 120px;
        height: 120px;
    }
    
    #projectSubmitText {
        font-size: 0.75rem;
    }
}

/* 轮播样式 */
.carousel-container {
    position: relative;
    overflow: hidden;
    width: 100%;
}

.carousel-items {
    position: relative;
    height: 100%;
}

.carousel-item {
    position: absolute;
    opacity: 0;
    transition: opacity 0.5s ease;
    width: 100%;
    height: 100%;
}

.carousel-item.active {
    opacity: 1;
    position: relative;
}

.carousel-control {
    cursor: pointer;
    opacity: 0.7;
    transition: opacity 0.3s ease;
    z-index: 5;
}

.carousel-control:hover {
    opacity: 1;
}

.carousel-indicators {
    z-index: 5;
}

.carousel-indicators .indicator {
    cursor: pointer;
    transition: all 0.3s ease;
}

.carousel-indicators .indicator.active {
    background-color: white;
    transform: scale(1.2);
}