:root {
    --primary: #4a6bff;
    --primary-variant: #3a56cc;
    --secondary: #00c8a4;
    --secondary-variant: #00a086;
    --tertiary: #ff6b6b;
    --background: #dadeff;
    --surface: #fff8ea;
    --error: #ff4d4f;
    --success: #52c41a;
    --warning: #faad14;
    --on-primary: #ffffff;
    --on-secondary: #ffffff;
    --on-tertiary: #ffffff;
    --on-background: #1a1a1a;
    --on-surface: #1a1a1a;
    --on-error: #ffffff;
    --text-primary: rgba(26, 26, 26, 0.95);
    --text-secondary: rgba(26, 26, 26, 0.7);
    --text-hint: rgba(26, 26, 26, 0.5);
    --text-disabled: rgba(26, 26, 26, 0.38);
    --border-color: rgba(0, 0, 0, 0.12);
    --divider-color: rgba(0, 0, 0, 0.08);
    
    --elevation-1: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --elevation-2: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --elevation-4: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --elevation-6: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    --shape-small: 4px;
    --shape-medium: 8px;
    --shape-large: 16px;
    --shape-extra-large: 24px;
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    --animation-duration: 0.3s;
    --animation-easing: cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --primary: #5d7aff;
    --primary-variant: #4a62e6;
    --secondary: #00d8b5;
    --secondary-variant: #00b899;
    --tertiary: #ff7b7b;
    --background: #2c2a2b;
    --surface: #2c2326;
    --error: #ff6b6b;
    --success: #6dd400;
    --warning: #ffc53d;
    --on-primary: #ffffff;
    --on-secondary: #000000;
    --on-tertiary: #000000;
    --on-background: #ffffff;
    --on-surface: #ffffff;
    --on-error: #000000;
    --text-primary: rgba(255, 255, 255, 0.95);
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-hint: rgba(255, 255, 255, 0.5);
    --text-disabled: rgba(255, 255, 255, 0.38);
    --border-color: rgba(255, 255, 255, 0.12);
    --divider-color: rgba(255, 255, 255, 0.08);
}

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

body {
    font-family: "Intel One Mono", monospace;
    background-color: var(--background);
    color: var(--text-primary);
    font-weight: 600;
    line-height: 1.5;
    transition: 
        background-color var(--animation-duration) var(--animation-easing),
        color var(--animation-duration) var(--animation-easing);
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    background-color: var(--background);
}

.app-header {
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: center;
    background-color: var(--primary);
    color: var(--on-primary);
    box-shadow: var(--elevation-2);
    position: relative;
    z-index: 10;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.app-header h1 {
    font-family: "Intel One Mono", monospace;
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 0.15px;
    flex-grow: 1;
}

.refresh-btn {
    background: none;
    border: none;
    color: var(--on-primary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: 50%;
    transition: all var(--animation-duration) var(--animation-easing);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

.refresh-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.refresh-btn .material-icons {
    font-size: 24px;
}

.app-content {
    flex: 1;
    padding: var(--spacing-lg) var(--spacing-md);
    padding-bottom: 80px;
}

.screen {
    display: none;
}

.screen.active {
    display: block;
    animation: fadeIn var(--animation-duration) var(--animation-easing);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.ip-card {
    background-color: var(--surface);
    border-radius: var(--shape-medium);
    box-shadow: var(--elevation-1);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    transition: all var(--animation-duration) var(--animation-easing);
    border: 1px solid var(--border-color);
}

.ip-card:hover {
    box-shadow: var(--elevation-2);
    transform: translateY(-2px);
}

.ip-header {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    background-color: var(--primary);
    color: var(--on-primary);
}

.ip-header .material-icons {
    margin-right: var(--spacing-sm);
    font-size: 24px;
}

.ip-header h2 {
    font-family: "Intel One Mono", monospace;
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.ip-content {
    font-family: "Intel One Mono", monospace;
    padding: var(--spacing-md);
}

.ip-address {
    font-family: "Intel One Mono", monospace;
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    word-break: break-all;
    color: var(--text-primary);
    background-color: color-mix(in srgb, var(--surface) 90%, var(--background));
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--shape-small);
    border-left: 4px solid var(--primary);
}

.ip-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.ip-details p {
    font-family: "Intel One Mono", monospace;
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.875rem;
    display: flex;
    align-items: flex-start;
}

.ip-details p strong {
    min-width: 80px;
    color: var(--text-primary);
    font-weight: 500;
}

.ipv6 .ip-header {
    background-color: var(--secondary);
    color: var(--on-secondary);
}

.ipv6 .ip-address {
    border-left-color: var(--secondary);
}

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--surface);
    box-shadow: 0 -1px 3px 1px rgba(0, 0, 0, 0.1), 0 -1px 2px 0 rgba(0, 0, 0, 0.06);
    z-index: 100;
    border-top: 1px solid var(--border-color);
}

.nav-container {
    display: flex;
    justify-content: space-around;
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-xs) 0;
}

.nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xs) 0;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    text-decoration: none;
    transition: color 0.2s;
    position: relative;
    font-family: "Intel One Mono", monospace;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    opacity: 0.9;
}

.nav-item.active {
    color: var(--primary);
    opacity: 1;
}

.nav-item.active::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 50%;
    transform: translateX(-50%);
    width: 32px;
    height: 3px;
    background-color: var(--primary);
    border-radius: 3px;
}

.nav-item .material-icons {
    margin-bottom: 2px;
    font-size: 24px;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding: 0 var(--spacing-xs);
}

.history-header h2 {
    font-family: "Intel One Mono", monospace;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.text-button {
    background: none;
    border: none;
    color: var(--primary);
    font-size: 0.875rem;
    font-family: "Intel One Mono", monospace;
    font-weight: 600;
    cursor: pointer;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--shape-medium);
    transition: background-color 0.2s;
}

.text-button:hover {
    background-color: color-mix(in srgb, var(--primary) 10%, transparent);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    width: 100%;
}

.history-item {
    background-color: var(--surface);
    border-radius: var(--shape-medium);
    padding: var(--spacing-md);
    box-shadow: var(--elevation-1);
    border: 1px solid var(--border-color);
    transition: all var(--animation-duration) var(--animation-easing);
    overflow: hidden;
    word-wrap: break-word;
}

.history-item p {
    margin-bottom: 6px;
    font-family: "Intel One Mono", monospace;
    font-size: 0.875rem;
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
}

.history-item p strong {
    min-width: 80px;
    color: var(--text-secondary);
    font-family: "Intel One Mono", monospace;
    font-weight: 600;
    flex-shrink: 0; 
}

@media (max-width: 768px) {
    .history-item p {
        flex-direction: column;
    }
    
    .history-item p strong {
        margin-bottom: 4px;
    }
}

.history-item .timestamp {
    color: var(--text-secondary);
    font-size: 0.75rem;
    margin-top: var(--spacing-xs);
    display: flex;
    align-items: center;
}

.history-item .timestamp .material-icons {
    font-family: "Intel One Mono", monospace;
    font-size: 16px;
    margin-right: 4px;
}

.empty-history {
    text-align: center;
    color: var(--text-secondary);
    padding: var(--spacing-xl) 0;
    font-size: 0.875rem;
}

.settings-screen {
    padding: 0 var(--spacing-xs);
}

.settings-screen h2 {
    font-family: "Intel One Mono", monospace;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    padding: 0 var(--spacing-xs);
}

.setting-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s;
    gap: var(--spacing-md);
}

.setting-item:last-child {
    border-bottom: none;
}

.setting-item:hover {
    background-color: color-mix(in srgb, var(--primary) 5%, transparent);
}

.setting-item span {
    font-family: "Intel One Mono", monospace;
    font-size: 0.875rem;
    color: var(--text-primary);
    flex-grow: 1;
}

.switch {
    position: relative;
    display: inline-block;
    width: 42px;
    height: 24px;
    flex-shrink: 0;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: color-mix(in srgb, var(--text-primary) 30%, transparent);
    transition: .2s var(--animation-easing);
    border-radius: 12px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 2px;
    bottom: 2px;
    background-color: var(--surface);
    transition: .2s var(--animation-easing);
    border-radius: 50%;
    box-shadow: var(--elevation-1);
}

input:checked + .slider {
    background-color: var(--primary);
}

input:checked + .slider:before {
    transform: translateX(18px);
}

.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--error);
    color: var(--on-error);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--shape-medium);
    box-shadow: var(--elevation-6);
    opacity: 0;
    transition: opacity var(--animation-duration) var(--animation-easing);
    z-index: 1000;
    max-width: 90%;
    text-align: center;
    font-size: 0.875rem;
    font-weight: 500;
}

.toast.show {
    opacity: 1;
}

@media (max-width: 600px) {
    .app-header {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .app-content {
        padding: var(--spacing-md);
        padding-bottom: 80px;
    }
    
    .ip-card {
        margin-bottom: var(--spacing-md);
    }
    
    .ip-header {
        padding: var(--spacing-sm);
    }
    
    .ip-content {
        padding: var(--spacing-sm);
    }
    
    .history-header {
        padding: 0 var(--spacing-xs);
    }
    
    .settings-screen {
        padding: 0 var(--spacing-xs);
    }
}

@media (min-width: 601px) {
    .app-header {
        padding: var(--spacing-md) var(--spacing-xl);
    }
    
    .app-header h1 {
        font-size: 1.75rem;
    }
    
    .app-content {
        padding: var(--spacing-xl) var(--spacing-lg);
        padding-bottom: 80px;
    }
    
    .ip-card {
        margin-bottom: var(--spacing-lg);
    }
    
    .ip-header {
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .ip-content {
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .ip-address {
        font-size: 1.1rem;
    }
    
    .nav-container {
        padding: var(--spacing-sm) 0;
    }
    
    .history-header {
        padding: 0 var(--spacing-md);
    }
    
    .settings-screen {
        padding: 0 var(--spacing-md);
    }
}

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

.loading {
    animation: pulse 1.5s ease-in-out infinite;
}
.ping-card {
    margin-top: var(--spacing-lg);
    max-width: 100%;
    width: 100%;
    box-sizing: border-box;
}

.ping-controls {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    flex-direction: column;
}

@media (min-width: 600px) {
    .ping-controls {
        flex-direction: row;
    }
}

.ping-input {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 1px solid var(--border-color);
    border-radius: var(--shape-medium);
    background-color: var(--surface);
    color: var(--text-primary);
    font-family: "Intel One Mono", monospace;
    font-size: 0.9375rem;
    transition: all var(--animation-duration) var(--animation-easing);
    min-height: 48px;
}

.ping-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 25%, transparent);
}

.ping-button {
    position: relative;
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--primary);
    color: var(--on-primary);
    border: none;
    border-radius: var(--shape-medium);
    font-family: "Intel One Mono", monospace;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--animation-duration) var(--animation-easing);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    min-width: 100px;
    justify-content: center;
    min-height: 48px;
}

.ping-button:hover {
    background-color: var(--primary-variant);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.ping-button:active {
    transform: translateY(0);
    box-shadow: none;
}

.spinner {
    width: 18px;
    height: 18px;
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    border-top-color: var(--on-primary);
    border-right-color: color-mix(in srgb, var(--on-primary) 80%, transparent);
    border-bottom-color: color-mix(in srgb, var(--on-primary) 60%, transparent);
    animation: spin 0.8s cubic-bezier(0.68, -0.55, 0.27, 1.55) infinite;
}

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

.hidden {
    display: none !important;
}

.ping-results {
    font-family: "Intel One Mono", monospace;
    font-size: 0.875rem;
    background-color: color-mix(in srgb, var(--surface) 90%, var(--background));
    border-radius: var(--shape-medium);
    padding: var(--spacing-sm);
    max-height: 400px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--primary) var(--surface);
}

.ping-results::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.ping-results::-webkit-scrollbar-track {
    background: var(--surface);
    border-radius: var(--shape-small);
}

.ping-results::-webkit-scrollbar-thumb {
    background-color: var(--primary);
    border-radius: var(--shape-small);
}

.ping-result {
    margin-bottom: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--shape-small);
    background-color: var(--surface);
    border-left: 4px solid var(--primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    animation: fadeIn 0.3s ease-out;
    flex-wrap: wrap;
}

.ping-result.success {
    border-left-color: var(--success);
}

.ping-result.error {
    border-left-color: var(--error);
}

.ping-result .ping-number {
    font-weight: 600;
    color: var(--text-primary);
    min-width: 40px;
    flex-shrink: 0;
}

.ping-result .ping-time {
    color: var(--secondary);
    font-weight: 600;
    margin-left: auto;
    white-space: nowrap;
}

.ping-result .ping-error {
    color: var(--error);
    flex: 1 1 100%;
    margin-top: var(--spacing-xs);
}

@media (min-width: 480px) {
    .ping-result .ping-error {
        flex: 1;
        margin-top: 0;
    }
}

.ping-result .ping-icon {
    font-size: 18px;
    flex-shrink: 0;
}

.ping-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: color-mix(in srgb, var(--surface) 90%, var(--background));
    border-radius: var(--shape-medium);
}

@media (min-width: 600px) {
    .ping-stats {
        grid-template-columns: repeat(4, 1fr);
    }
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-sm);
    background-color: var(--surface);
    border-radius: var(--shape-small);
}

.stat-label {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    text-align: center;
}

.stat-value {
    font-weight: 700;
    color: var(--text-primary);
    font-size: 1.125rem;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.ping-result.temporary {
    transition: opacity 0.3s ease;
}

.ping-result.temporary.hiding {
    opacity: 0;
}