:root {
    --bg-primary: #f8f6f9;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f0edf3;
    --bg-card: #ffffff;
    --bg-card-rgb: 255, 255, 255;
    --bg-card-hover: #faf8fc;
    --bg-modal: #ffffff;
    --bg-overlay: rgba(0, 0, 0, 0.4);
    --text-primary: #2d1b3d;
    --text-secondary: #6b5a7d;
    --text-tertiary: #9b8aad;
    --text-inverse: #ffffff;
    --border-color: #e8e0f0;
    --border-color-rgb: 232, 224, 240;
    --border-light: #f0eaf5;
    --accent: #e8668a;
    --accent-rgb: 232, 102, 138;
    --accent-light: #fce4ec;
    --accent-hover: #d44a72;
    --success: #4caf7d;
    --success-light: #e8f5e9;
    --warning: #f5a623;
    --warning-light: #fff8e1;
    --danger: #e74c5e;
    --danger-light: #fde8eb;
    --info: #5c9ced;
    --info-light: #e3f0ff;
    --shadow-sm: 0 1px 3px rgba(45, 27, 61, 0.06);
    --shadow-md: 0 4px 12px rgba(45, 27, 61, 0.08);
    --shadow-lg: 0 8px 30px rgba(45, 27, 61, 0.12);
    --shadow-card: 0 2px 8px rgba(45, 27, 61, 0.05);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
    --header-height: 64px;
    --sakura-1: #ffb7c5;
    --sakura-2: #ff8fa3;
    --sakura-3: #e8668a;
    --sakura-4: #c94064;
    --chart-cpu: #e8668a;
    --chart-ram: #4caf7d;
    --chart-network-down: #5c9ced;
    --chart-network-up: #f5a623;
    --chart-disk: #7ab3f7;
    --chart-process: #ff8fa3;
    --chart-connections: #a78bfa;
    --chart-connections-udp: #34d399;
    --chart-bg: #faf8fc;
    --chart-grid: #ede6f3;
    --chart-text: #9b8aad;
    --chart-empty-text: #c4b8d0;
    --chart-latency-grid: #ede6f3;
    --chart-latency-text: #9b8aad;
    --chart-loss-line: #f5a623;
    --chart-hint-text: rgba(155, 138, 173, 0.6);
    --chart-dot-center: #ffffff;
}

[data-theme="dark"] {
    --bg-primary: #0f0a15;
    --bg-secondary: #1a1225;
    --bg-tertiary: #241a32;
    --bg-card: #1e1530;
    --bg-card-rgb: 30, 21, 48;
    --bg-card-hover: #261c3a;
    --bg-modal: #1e1530;
    --bg-overlay: rgba(0, 0, 0, 0.6);
    --text-primary: #e8dff0;
    --text-secondary: #a899b8;
    --text-tertiary: #7a6b8a;
    --text-inverse: #0f0a15;
    --border-color: #2d2040;
    --border-color-rgb: 45, 32, 64;
    --border-light: #241a32;
    --accent: #ff8fa3;
    --accent-light: #3d1a2a;
    --accent-hover: #ffb7c5;
    --success: #5ec492;
    --success-light: #1a2e22;
    --warning: #f5b84a;
    --warning-light: #2e2818;
    --danger: #ff6b7a;
    --danger-light: #2e1a1e;
    --info: #7ab3f7;
    --info-light: #1a2230;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.4);
    --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.2);
    --chart-cpu: #ff8fa3;
    --chart-ram: #5ec492;
    --chart-network-down: #7ab3f7;
    --chart-network-up: #f5b84a;
    --chart-disk: #93bbfd;
    --chart-process: #ffb7c5;
    --chart-connections: #c4b5fd;
    --chart-connections-udp: #6ee7b7;
    --chart-bg: #1a1225;
    --chart-grid: #2d2040;
    --chart-text: #7a6b8a;
    --chart-empty-text: #4a3d5c;
    --chart-latency-grid: #2d2040;
    --chart-latency-text: #7a6b8a;
    --chart-loss-line: #f5b84a;
    --chart-hint-text: rgba(122, 107, 138, 0.6);
    --chart-dot-center: #1e1530;
}

.custom-background {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    pointer-events: none;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    transition: opacity 0.5s ease, filter 0.3s ease;
    overflow: hidden;
}

.custom-background video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    transform: translate(-50%, -50%);
    object-fit: cover;
}

.custom-background.hidden {
    opacity: 0;
}

.custom-background.hidden video {
    display: none;
}

body.has-custom-background {
    background: transparent;
}

body.has-custom-background::before {
    display: none;
}

[data-theme="dark"] body.has-custom-background .welcome-section {
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2),
                0 2px 8px rgba(0, 0, 0, 0.12);
}

[data-theme="dark"] body.has-custom-background .node-card {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15),
                0 1px 4px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] body.has-custom-background .node-card:hover {
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25),
                0 4px 8px rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] body.has-custom-background .stat-item {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] body.has-custom-background .stat-item:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] body.has-custom-background .table-card {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] body.has-custom-background .table-card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: background var(--transition), color var(--transition);
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(232, 102, 138, 0.04) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(92, 156, 237, 0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

[data-theme="dark"] body::before {
    background:
        radial-gradient(ellipse at 20% 20%, rgba(232, 102, 138, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(92, 156, 237, 0.04) 0%, transparent 50%);
}

#app {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
    padding: 24px;
    max-width: 1440px;
    margin: 0 auto;
    width: 100%;
}

.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 24px;
    gap: 16px;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading-text {
    font-size: 0.9rem;
    color: var(--text-tertiary);
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 24px;
    gap: 12px;
    color: var(--text-tertiary);
}

.empty-state svg {
    width: 48px;
    height: 48px;
    opacity: 0.5;
}

.empty-state p {
    font-size: 0.95rem;
}

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

::selection {
    background: var(--accent);
    color: var(--text-inverse);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

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

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

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

@keyframes staggerFadeIn {
    from {
        opacity: 0;
        transform: translateY(12px) scale(0.97);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes chartReveal {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes cardSlideIn {
    from {
        opacity: 0;
        transform: translateX(-16px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

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

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.animate-fade-in {
    animation: fadeIn var(--transition-slow) ease forwards;
}

.animate-fade-in-up {
    animation: fadeInUp var(--transition-slow) ease forwards;
}

.animate-fade-in-down {
    animation: fadeInDown var(--transition-slow) ease forwards;
}

.animate-fade-in-scale {
    animation: fadeInScale var(--transition-slow) ease forwards;
}

.animate-slide-in-left {
    animation: slideInLeft var(--transition-slow) ease forwards;
}

.animate-slide-in-right {
    animation: slideInRight var(--transition-slow) ease forwards;
}

.animate-pulse {
    animation: pulse 2s ease-in-out infinite;
}

.animate-shimmer {
    background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-card) 50%, var(--bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

.animate-spin {
    animation: spin 1s linear infinite;
}

.animate-bounce {
    animation: bounce 1s ease-in-out infinite;
}

.skeleton {
    background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-card) 50%, var(--bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-sm);
}

.skeleton-text {
    height: 1em;
    margin: 0.5em 0;
    border-radius: 4px;
}

.skeleton-title {
    height: 1.5em;
    width: 60%;
    margin-bottom: 0.5em;
    border-radius: 4px;
}

.skeleton-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.skeleton-card {
    height: 200px;
    border-radius: var(--radius-md);
}

.loading-spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading-dots {
    display: inline-flex;
    gap: 4px;
}

.loading-dots span {
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
    animation: bounce 1.4s ease-in-out infinite;
}

.loading-dots span:nth-child(1) { animation-delay: 0s; }
.loading-dots span:nth-child(2) { animation-delay: 0.2s; }
.loading-dots span:nth-child(3) { animation-delay: 0.4s; }

.btn-ripple {
    position: relative;
    overflow: hidden;
}

.btn-ripple::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s ease, height 0.6s ease;
}

.btn-ripple:active::after {
    width: 200px;
    height: 200px;
}

* {
    -webkit-tap-highlight-color: transparent;
}

input,
button,
select,
textarea {
    font-size: 16px;
}

.node-card,
.filter-btn,
.modal-tab,
.view-btn,
.theme-toggle,
.lang-toggle,
.login-btn {
    -webkit-user-select: none;
    user-select: none;
    touch-action: manipulation;
}

.status-dot,
.node-status-dot {
    transition: all var(--transition);
}

.status-dot.online,
.node-status-dot:not(.offline) {
    animation: pulse 2s ease-in-out infinite;
}

.metric-bar {
    transition: width var(--transition-slow) ease;
}

.metric-value {
    transition: all var(--transition);
}

@media (max-width: 768px) {
    .main-content {
        padding: 12px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}