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

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #edf5ff;
    --bg-hover: #e2e8f0;
    --text-primary: #d4d4d4;
    --text-secondary: #9cdcfe;
    --text-muted: #808080;
    --accent-primary: #0f4ba5;
    --accent-secondary: #0e639c;
    --success: #4ec9b0;
    --error: #f44747;
    --warning: #dcdcaa;
    --border: #e2e8f0;
    --general-category: #9cdcfe;
    --request-category: #4ec9b0;
    --response-category: #ce9178;
    --entity-category: #b5cea8;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
}

.header h1 {
    font-size: 2rem;
    font-weight: 300;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.tabs {
    display: flex;
    gap: 5px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 12px 24px;
    cursor: pointer;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    border-bottom: 2px solid transparent;
}

.tab-btn:hover {
    color: var(--text-primary);
    background-color: var(--bg-hover);
}

.tab-btn.active {
    color: var(--text-secondary);
    border-bottom-color: var(--accent-primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

.info-banner {
    background-color: var(--bg-tertiary);
    border-left: 4px solid var(--accent-primary);
    padding: 12px 16px;
    margin-bottom: 20px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.info-icon {
    font-size: 1.2rem;
}

.headers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 20px;
}

.panel {
    background-color: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border);
    overflow: hidden;
}

.panel-header {
    background-color: var(--bg-tertiary);
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
}

.panel-header h2 {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.panel-content {
    padding: 15px;
    max-height: 500px;
    overflow-y: auto;
}

.loading {
    color: var(--text-muted);
    text-align: center;
    padding: 40px;
}

.header-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
    transition: background-color 0.2s ease;
}

.header-item:hover {
    background-color: var(--bg-hover);
    margin: 0 -15px;
    padding-left: 15px;
    padding-right: 15px;
}

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

.header-category {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 3px;
    font-size: 0.7rem;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    min-width: 70px;
    text-align: center;
}

.header-category.general {
    background-color: rgba(156, 220, 254, 0.2);
    color: var(--general-category);
}

.header-category.request {
    background-color: rgba(78, 201, 176, 0.2);
    color: var(--request-category);
}

.header-category.response {
    background-color: rgba(206, 145, 120, 0.2);
    color: var(--response-category);
}

.header-category.entity {
    background-color: rgba(181, 206, 168, 0.2);
    color: var(--entity-category);
}

.header-info {
    flex: 1;
}

.header-name {
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 3px;
    cursor: help;
    position: relative;
}

.header-value {
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.8rem;
    color: var(--text-primary);
    word-break: break-all;
}

.header-description {
    display: none;
    position: absolute;
    bottom: 100%;
    left: 0;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    padding: 10px 15px;
    border-radius: 6px;
    font-size: 0.8rem;
    color: var(--text-muted);
    max-width: 350px;
    z-index: 100;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    white-space: normal;
    line-height: 1.5;
}

.header-name:hover .header-description {
    display: block;
}

.copy-btn {
    background-color: var(--accent-primary);
    border: none;
    color: white;
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: background-color 0.2s ease;
}

.copy-btn:hover {
    background-color: var(--accent-secondary);
}

.test-form {
    background-color: var(--bg-secondary);
    padding: 25px;
    border-radius: 8px;
    border: 1px solid var(--border);
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

input[type="url"],
input[type="text"],
select,
textarea {
    width: 100%;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 10px 12px;
    border-radius: 4px;
    font-size: 0.9rem;
    font-family: inherit;
    transition: border-color 0.2s ease;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
}

textarea {
    resize: vertical;
    min-height: 80px;
    font-family: 'Consolas', 'Monaco', monospace;
}

.header-row {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
    align-items: center;
}

.header-key {
    flex: 1;
}

.header-value {
    flex: 2;
}

.remove-header {
    background-color: var(--error);
    border: none;
    color: white;
    width: 30px;
    height: 30px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1.2rem;
    transition: opacity 0.2s ease;
}

.remove-header:hover {
    opacity: 0.8;
}

.add-btn {
    background-color: transparent;
    border: 1px dashed var(--border);
    color: var(--text-muted);
    padding: 10px 20px;
    cursor: pointer;
    border-radius: 4px;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.add-btn:hover {
    border-color: var(--accent-primary);
    color: var(--text-secondary);
}

.send-btn {
    background-color: var(--success);
    border: none;
    color: var(--bg-primary);
    padding: 12px 30px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 4px;
    transition: opacity 0.2s ease;
}

.send-btn:hover {
    opacity: 0.9;
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.test-results {
    animation: fadeIn 0.3s ease;
}

.test-results.hidden {
    display: none;
}

.status-bar {
    background-color: var(--bg-secondary);
    padding: 15px 20px;
    border-radius: 8px;
    border: 1px solid var(--border);
    margin-bottom: 20px;
    display: flex;
    gap: 20px;
    align-items: center;
    flex-wrap: wrap;
}

.status-code {
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 1.2rem;
    font-weight: bold;
    padding: 4px 12px;
    border-radius: 4px;
}

.status-code.success {
    background-color: rgba(78, 201, 176, 0.2);
    color: var(--success);
}

.status-code.error {
    background-color: rgba(244, 71, 71, 0.2);
    color: var(--error);
}

.status-text {
    color: var(--text-muted);
}

.response-time {
    margin-left: auto;
    color: var(--warning);
    font-family: 'Consolas', 'Monaco', monospace;
}

.raw-content {
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--text-primary);
    white-space: pre-wrap;
    word-break: break-all;
}

.toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: var(--success);
    color: var(--bg-primary);
    padding: 12px 24px;
    border-radius: 6px;
    font-weight: 500;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 1000;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.no-headers {
    color: var(--text-muted);
    text-align: center;
    padding: 40px;
    font-style: italic;
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .header h1 {
        font-size: 1.5rem;
    }
    
    .tabs {
        flex-wrap: wrap;
    }
    
    .tab-btn {
        padding: 10px 15px;
        font-size: 0.85rem;
    }
    
    .headers-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .panel-content {
        max-height: 400px;
    }
    
    .header-row {
        flex-direction: column;
    }
    
    .header-key,
    .header-value {
        width: 100%;
    }
    
    .remove-header {
        align-self: flex-end;
    }
}

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-hover);
    border-radius: 5px;
}

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