:root {
    --primary-hue: 230;
    --primary-color: hsl(var(--primary-hue), 89%, 60%);
    --primary-dark: hsl(var(--primary-hue), 89%, 50%);
    --primary-light: hsl(var(--primary-hue), 89%, 95%);
    
    --secondary-hue: 260;
    --secondary-color: hsl(var(--secondary-hue), 70%, 55%);
    --secondary-dark: hsl(var(--secondary-hue), 70%, 45%);
    
    --accent-hue: 190;
    --accent-color: hsl(var(--accent-hue), 85%, 50%);
    
    --success-color: #10b981;
    --success-light: #d1fae5;
    --warning-color: #f59e0b;
    --warning-light: #fef3c7;
    --danger-color: #ef4444;
    --danger-light: #fee2e2;
    --info-color: #3b82f6;
    --info-light: #dbeafe;
    
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    
    --border-color: #e5e7eb;
    --border-color-light: #f3f4f6;
    
    --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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', 'Source Code Pro', monospace;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: linear-gradient(135deg, #f5f7fa 0%, #e8ecf1 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 24px;
}

header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 1.25rem 0;
    box-shadow: var(--shadow-lg);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background-attachment: fixed;
    overflow: visible;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    overflow: visible;
}

.logo {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.logo i {
    font-size: 1.5rem;
    color: var(--accent-color);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.nav-links {
    display: flex;
    gap: 0.5rem;
    overflow: visible;
    align-items: center;
}

.nav-links > a {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    position: relative;
    min-height: 2.5rem;
    display: flex;
    align-items: center;
}

.nav-links > a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: all var(--transition-base);
    transform: translateX(-50%);
}

.nav-links > a:hover, .nav-links > a.active {
    color: white;
    background-color: rgba(255, 255, 255, 0.15);
}

.nav-links > a:hover::after, .nav-links > a.active::after {
    width: 60%;
}

.mobile-menu-btn {
    display: none;
    background: rgba(255, 255, 255, 0.15);
    border: none;
    color: white;
    font-size: 1.4rem;
    cursor: pointer;
    padding: 0.6rem 1rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
}

.mobile-menu-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: scale(1.05);
}

.mobile-theme-toggle {
    display: none;
}

.theme-toggle {
    display: flex !important;
    background: rgba(255, 255, 255, 0.15) !important;
    border: none !important;
    color: white !important;
    font-size: 0.95rem !important;
    cursor: pointer !important;
    padding: 0.6rem 1.2rem !important;
    border-radius: var(--radius-sm) !important;
    transition: all var(--transition-base) !important;
    align-items: center !important;
    justify-content: center !important;
    min-height: 2.5rem !important;
    box-sizing: border-box !important;
    text-decoration: none !important;
    font-family: inherit !important;
    line-height: 1 !important;
    font-weight: 500 !important;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.25) !important;
    transform: scale(1.05) !important;
}

.theme-toggle i {
    font-size: 1rem !important;
    line-height: 1 !important;
}

main {
    display: flex;
    min-height: calc(100vh - 180px);
    padding: 2.5rem 0;
    gap: 2rem;
}

main.about-page {
    display: block;
}

.sidebar {
    width: 300px;
    flex-shrink: 0;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 1.5rem;
    height: fit-content;
    position: sticky;
    top: 100px;
    border: 1px solid var(--border-color-light);
}

.sidebar h3 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    font-size: 1.1rem;
    font-weight: 600;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border-color-light);
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar h3 i {
    color: var(--primary-color);
}

.tool-categories {
    list-style: none;
}

.tool-category {
    margin-bottom: 1.5rem;
}

.tool-category:last-child {
    margin-bottom: 0;
}

.tool-category h4 {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 1.5px;
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.tool-list {
    list-style: none;
}

.tool-item {
    margin-bottom: 0.4rem;
}

.tool-item a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0.75rem 1rem;
    text-decoration: none;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    font-weight: 500;
    font-size: 0.95rem;
}

.tool-item a:hover {
    background: var(--primary-light);
    color: var(--primary-color);
    transform: translateX(4px);
}

.tool-item a.active {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--info-light) 100%);
    color: var(--primary-color);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.tool-item i {
    width: 20px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    transition: color var(--transition-base);
}

.tool-item a:hover i, .tool-item a.active i {
    color: var(--primary-color);
}

.tool-content {
    flex: 1;
    min-width: 0;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 2.5rem;
    border: 1px solid var(--border-color-light);
}

.tool-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color-light);
}

.tool-header h2 {
    color: var(--text-primary);
    font-size: 1.75rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 12px;
    letter-spacing: -0.5px;
}

.tool-header h2 i {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.tool-header p {
    color: var(--text-secondary);
    margin-top: 0.75rem;
    font-size: 1rem;
    line-height: 1.7;
}

.tool-interface {
    margin-top: 1.5rem;
}

.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.6rem;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.input-group textarea, 
.input-group input, 
.input-group select {
    width: 100%;
    padding: 0.9rem 1.1rem;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    transition: all var(--transition-base);
    background: var(--bg-primary);
    font-family: var(--font-sans);
}

.input-group textarea {
    min-height: 140px;
    resize: vertical;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.6;
}

.input-group textarea:focus, 
.input-group input:focus, 
.input-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

.input-group input::placeholder,
.input-group textarea::placeholder {
    color: var(--text-muted);
}

.btn-group {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: var(--shadow-sm);
}

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

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

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: var(--border-color);
    transform: translateY(-2px);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color) 0%, #059669 100%);
}

.btn-success:hover {
    box-shadow: var(--shadow-md);
}

.btn i {
    font-size: 0.9rem;
}

.result-group {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 2px solid var(--border-color-light);
}

.result-group h4 {
    margin-bottom: 1rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1rem;
    font-weight: 600;
}

.result-group h4 i {
    color: var(--primary-color);
}

.result-box {
    background: var(--bg-secondary);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    min-height: 80px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    white-space: pre-wrap;
    word-break: break-all;
    overflow-y: auto;
    max-height: 350px;
    line-height: 1.6;
}

footer {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    color: var(--text-primary);
    padding: 2.5rem 0;
    margin-top: 3rem;
}

.dark-theme footer {
    background: linear-gradient(135deg, #1f2937 0%, #111827 100%);
    color: white;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.footer-info h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.footer-info p {
    color: #9ca3af;
    margin-top: 0.5rem;
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: #9ca3af;
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-base);
    font-size: 0.95rem;
}

.footer-links a:hover {
    color: white;
    transform: translateY(-2px);
}

.hash-options, 
.base64-options, 
.char-conversion-types, 
.ip-conversion-types, 
.timestamp-types {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-bottom: 1.5rem;
}

.hash-option, 
.base64-option, 
.conversion-type, 
.ip-conversion-type, 
.timestamp-type {
    padding: 0.6rem 1.2rem;
    background: var(--bg-tertiary);
    border-radius: 20px;
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    border: 1.5px solid transparent;
}

.hash-option:hover, 
.base64-option:hover, 
.conversion-type:hover, 
.ip-conversion-type:hover, 
.timestamp-type:hover {
    background: var(--primary-light);
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.hash-option.active, 
.base64-option.active, 
.conversion-type.active, 
.ip-conversion-type.active, 
.timestamp-type.active {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: var(--shadow-sm);
}

.notification {
    position: fixed;
    top: 100px;
    right: 24px;
    padding: 1rem 1.5rem;
    background: var(--success-color);
    color: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    z-index: 2000;
    display: flex;
    align-items: center;
    gap: 10px;
    transform: translateX(120%);
    transition: transform var(--transition-slow);
    font-weight: 500;
}

.notification.show {
    transform: translateX(0);
}

.notification i {
    font-size: 1.2rem;
}

.subnet-calculator {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.subnet-result, 
.timestamp-result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.subnet-item, 
.timestamp-item {
    background: var(--bg-secondary);
    padding: 1.25rem;
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
    transition: all var(--transition-base);
}

.subnet-item:hover, 
.timestamp-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.subnet-item h5, 
.timestamp-item h5 {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.subnet-item p, 
.timestamp-item p {
    font-weight: 600;
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--text-primary);
    word-break: break-all;
}

.tool-description {
    background: linear-gradient(135deg, var(--info-light) 0%, var(--primary-light) 100%);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
    border-left: 4px solid var(--info-color);
}

.tool-description strong {
    color: var(--primary-color);
    font-weight: 600;
}

.tool-description p {
    margin-bottom: 0.75rem;
}

.tool-description p:last-child {
    margin-bottom: 0;
}

.code-formatter-options, 
.json-options {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.code-formatter-options label, 
.json-options label {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.code-formatter-options select, 
.json-options select {
    padding: 0.75rem;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    background: var(--bg-primary);
    cursor: pointer;
}

.json-valid {
    color: var(--success-color);
    font-weight: 600;
}

.json-invalid {
    color: var(--danger-color);
    font-weight: 600;
}

.hidden {
    display: none !important;
}

@media (max-width: 1200px) {
    .container {
        padding: 0 20px;
    }
    
    main {
        gap: 1.5rem;
    }
}

@media (max-width: 992px) {
    .sidebar {
        width: 260px;
    }
    
    .tool-content {
        padding: 2rem;
    }
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
        position: relative;
        z-index: 1002;
    }
    
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-dark) 100%);
        flex-direction: column;
        padding: 1rem;
        box-shadow: var(--shadow-xl);
        border-radius: 0 0 var(--radius-md) var(--radius-md);
        overflow: visible;
        z-index: 1001;
        max-width: calc(100% - 3rem);
    }
    
    .nav-links.show {
        display: flex;
    }
    
    .nav-links > a {
        padding: 0.9rem 1.2rem;
        border-radius: var(--radius-sm);
        width: 100%;
        justify-content: flex-start;
        margin: 0.25rem 0;
    }
    
    nav {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        position: relative;
        flex-wrap: nowrap;
    }
    
    .nav-links .theme-toggle {
        display: none !important;
    }
    
    .mobile-theme-toggle {
        display: flex !important;
        background: rgba(255, 255, 255, 0.15) !important;
        border: none !important;
        color: white !important;
        font-size: 1.1rem !important;
        cursor: pointer !important;
        padding: 0.6rem 1rem !important;
        border-radius: var(--radius-sm) !important;
        transition: all var(--transition-base) !important;
        align-items: center !important;
        justify-content: center !important;
        min-height: 2.5rem !important;
        min-width: 2.5rem !important;
        box-sizing: border-box !important;
        text-decoration: none !important;
        font-family: inherit !important;
        line-height: 1 !important;
        position: relative !important;
        z-index: 1002 !important;
        pointer-events: auto !important;
        visibility: visible !important;
        opacity: 1 !important;
        flex-shrink: 0;
    }
    
    .mobile-theme-toggle:hover {
        background: rgba(255, 255, 255, 0.25) !important;
        transform: scale(1.05) !important;
    }
    
    .mobile-theme-toggle i {
        font-size: 1rem !important;
        line-height: 1 !important;
        margin: 0 !important;
    }
    
    .mobile-theme-toggle:hover {
        background: rgba(255, 255, 255, 0.25) !important;
        transform: scale(1.05) !important;
    }
    
    .mobile-theme-toggle i {
        font-size: 1rem !important;
        line-height: 1 !important;
        margin: 0 !important;
    }
    
    .nav-links .dropdown-menu {
        position: static !important;
        display: none !important;
        box-shadow: none !important;
        border-radius: 0 !important;
        padding: 0 !important;
        background: rgba(255, 255, 255, 0.1) !important;
        margin-left: 1.5rem !important;
        margin-top: 0.5rem !important;
        z-index: 1 !important;
    }
    
    .nav-links .dropdown-menu.show {
        display: block !important;
    }
    
    .nav-links .dropdown-menu a {
        padding: 0.6rem 1rem !important;
        font-size: 0.85rem !important;
    }
    
    .dropdown-divider {
        background: rgba(255, 255, 255, 0.2);
    }
    
    main {
        flex-direction: column;
        padding: 1.5rem 0;
    }
    
    .sidebar {
        width: 100%;
        position: static;
        margin-bottom: 1.5rem;
    }
    
    .tool-content {
        padding: 1.5rem;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .hash-options, 
    .base64-options, 
    .char-conversion-types, 
    .ip-conversion-types, 
    .timestamp-types {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .logo {
        font-size: 1.4rem;
    }
    
    .logo i {
        font-size: 1.2rem;
    }
    
    .tool-header h2 {
        font-size: 1.4rem;
    }
    
    .tool-header h2 i {
        font-size: 1.2rem;
    }
    
    .subnet-result, 
    .timestamp-result-grid {
        grid-template-columns: 1fr;
    }
}

@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #f9fafb;
        --text-secondary: #d1d5db;
        --text-muted: #9ca3af;
        
        --bg-primary: #1f2937;
        --bg-secondary: #111827;
        --bg-tertiary: #374151;
        
        --border-color: #374151;
        --border-color-light: #4b5563;
    }
    
    body {
        background: linear-gradient(135deg, #111827 0%, #1f2937 100%);
    }
    
    .sidebar,
    .tool-content {
        background: var(--bg-primary);
        border-color: var(--border-color);
    }
    
    .input-group textarea, 
    .input-group input, 
    .input-group select,
    .result-box {
        background: var(--bg-secondary);
        border-color: var(--border-color);
        color: var(--text-primary);
    }
    
    .subnet-item, 
    .timestamp-item {
        background: var(--bg-secondary);
    }
    
    .tool-description {
        background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(67, 97, 238, 0.1) 100%);
    }
}

/* 手动深色主题 */
.dark-theme {
    --text-primary: #f9fafb !important;
    --text-secondary: #d1d5db !important;
    --text-muted: #9ca3af !important;
    
    --bg-primary: #1f2937 !important;
    --bg-secondary: #111827 !important;
    --bg-tertiary: #374151 !important;
    
    --border-color: #374151 !important;
    --border-color-light: #4b5563 !important;
}

.dark-theme body {
    background: linear-gradient(135deg, #111827 0%, #1f2937 100%) !important;
}

.dark-theme .sidebar,
.dark-theme .tool-content {
    background: var(--bg-primary) !important;
    border-color: var(--border-color) !important;
}

.dark-theme .input-group textarea, 
.dark-theme .input-group input, 
.dark-theme .input-group select,
.dark-theme .result-box {
    background: var(--bg-secondary) !important;
    border-color: var(--border-color) !important;
    color: var(--text-primary) !important;
}

.dark-theme .subnet-item, 
.dark-theme .timestamp-item {
    background: var(--bg-secondary) !important;
}

.dark-theme .tool-description {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(67, 97, 238, 0.1) 100%) !important;
}

.dark-theme .dropdown-menu {
    background: var(--bg-primary) !important;
    border: 1px solid var(--border-color) !important;
}

.dark-theme .dropdown-menu a {
    color: var(--text-primary) !important;
}

.dark-theme .dropdown-menu a:hover {
    background: var(--bg-tertiary) !important;
    color: var(--primary-color) !important;
}

.dark-theme .dropdown-menu a i {
    color: var(--text-muted) !important;
}

.dark-theme .dropdown-menu a:hover i {
    color: var(--primary-color) !important;
}

.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 40px;
    height: 40px;
    margin: -20px 0 0 -20px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.fade-in {
    animation: fadeIn 0.3s ease-in-out;
}

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

.slide-in {
    animation: slideIn 0.3s ease-out;
}

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

.pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.tool-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--primary-light);
    color: var(--primary-color);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-left: auto;
}

.tcp-ping-result {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin-top: 1.5rem;
}

.tcp-ping-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.tcp-ping-stat {
    background: var(--bg-primary);
    padding: 1rem;
    border-radius: var(--radius-sm);
    text-align: center;
    border: 1px solid var(--border-color);
}

.tcp-ping-stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    font-family: var(--font-mono);
}

.tcp-ping-stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.tcp-ping-log {
    margin-top: 1.5rem;
    max-height: 300px;
    overflow-y: auto;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.8;
}

.tcp-ping-log-entry {
    padding: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
}

.tcp-ping-log-entry:last-child {
    border-bottom: none;
}

.tcp-ping-log-entry.success {
    color: var(--success-color);
}

.tcp-ping-log-entry.error {
    color: var(--danger-color);
}

.tcp-ping-log-entry.timeout {
    color: var(--warning-color);
}

.dropdown {
    position: relative;
    display: inline-block;
    min-height: 2.5rem;
}

.dropdown > a {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    position: relative;
    min-height: 2.5rem;
    display: flex;
    align-items: center;
}

.dropdown > a:hover, .dropdown > a.active {
    color: white;
    background-color: rgba(255, 255, 255, 0.15);
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    min-width: 220px;
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-md);
    padding: 0.5rem 0;
    z-index: 1001;
    animation: slideDown 0.2s ease-out;
}

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

.dropdown-menu.show {
    display: block;
}

.dropdown-menu a {
    display: block;
    padding: 0.75rem 1.25rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: all var(--transition-base);
    font-size: 0.9rem;
}

.dropdown-menu a:hover {
    background: var(--primary-light);
    color: var(--primary-color);
    padding-left: 1.5rem;
}

.dropdown-menu a i {
    margin-right: 0.5rem;
    color: var(--text-muted);
    width: 16px;
    text-align: center;
}

.dropdown-menu a:hover i {
    color: var(--primary-color);
}

.dropdown-divider {
    height: 1px;
    background: var(--border-color);
    margin: 0.5rem 0;
}

.markdown-editor-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    min-height: 600px;
}

.markdown-input-wrapper {
    display: flex;
    flex-direction: column;
}

.markdown-input-wrapper textarea {
    flex: 1;
    resize: none;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.6;
}

.markdown-preview-wrapper {
    display: flex;
    flex-direction: column;
}

.markdown-preview {
    flex: 1;
    background: white;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 2rem;
    overflow-y: auto;
    line-height: 1.8;
}

.markdown-preview h1,
.markdown-preview h2,
.markdown-preview h3 {
    color: var(--text-primary);
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.markdown-preview h1 {
    font-size: 2rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.markdown-preview h2 {
    font-size: 1.5rem;
}

.markdown-preview h3 {
    font-size: 1.25rem;
}

.markdown-preview p {
    margin-bottom: 1rem;
}

.markdown-preview code {
    background: var(--bg-tertiary);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9em;
}

.markdown-preview pre {
    background: var(--bg-tertiary);
    padding: 1rem;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: 1rem 0;
}

.markdown-preview pre code {
    background: none;
    padding: 0;
}

.markdown-preview blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 1rem;
    margin: 1rem 0;
    color: var(--text-secondary);
    font-style: italic;
}

.markdown-preview ul,
.markdown-preview ol {
    margin: 1rem 0;
    padding-left: 2rem;
}

.markdown-preview li {
    margin-bottom: 0.5rem;
}

.markdown-preview a {
    color: var(--primary-color);
    text-decoration: none;
}

.markdown-preview a:hover {
    text-decoration: underline;
}

.markdown-preview img {
    max-width: 100%;
    border-radius: var(--radius-md);
    margin: 1rem 0;
}

.markdown-preview strong {
    font-weight: 700;
}

.markdown-preview em {
    font-style: italic;
}

.markdown-preview del {
    text-decoration: line-through;
    color: var(--text-muted);
}

.markdown-preview hr {
    border: none;
    border-top: 2px solid var(--border-color);
    margin: 2rem 0;
}

.markdown-preview table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

.markdown-preview th,
.markdown-preview td {
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    text-align: left;
}

.markdown-preview th {
    background: var(--bg-tertiary);
    font-weight: 600;
}

.markdown-preview tr:nth-child(even) {
    background: var(--bg-secondary);
}

.markdown-preview .placeholder {
    color: var(--text-muted);
    text-align: center;
    padding: 2rem;
    font-style: italic;
}

.markdown-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.markdown-tab {
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.markdown-tab:hover {
    background: var(--primary-light);
    color: var(--primary-color);
}

.markdown-tab.active {
    background: var(--primary-color);
    color: white;
}

.markdown-conversion-options {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.markdown-conversion-btn {
    padding: 0.6rem 1rem;
    background: var(--bg-tertiary);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.markdown-conversion-btn:hover {
    background: var(--primary-light);
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.markdown-conversion-btn i {
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .markdown-editor-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .markdown-preview {
        min-height: 400px;
    }
}

@media (prefers-color-scheme: dark) {
    .dropdown-menu {
        background: var(--bg-primary);
        border: 1px solid var(--border-color);
    }
    
    .dropdown-menu a:hover {
        background: var(--bg-tertiary);
    }
    
    .markdown-preview {
        background: var(--bg-secondary);
        border-color: var(--border-color);
    }
    
    .markdown-preview code {
        background: var(--bg-tertiary);
    }
    
    .markdown-preview pre {
        background: var(--bg-tertiary);
    }
    
    .markdown-preview th {
        background: var(--bg-tertiary);
    }
    
    .markdown-preview tr:nth-child(even) {
        background: var(--bg-primary);
    }
}