/* CSS Variables */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --background-color: #0f172a;
    --surface-color: #1e293b;
    --surface-elevated: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #334155;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
    --transition: all 0.2s ease;
}

/* Reset and Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

/* Header */
.header {
    text-align: center;
    padding: 2rem 1rem;
    margin-bottom: 2rem;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.logo {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-sm);
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Sections */
.section {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

.section h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

/* API Selection */
.api-controls {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--surface-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    width: 100%;
}

.btn-icon {
    font-size: 1.2em;
}

.btn-icon-only {
    padding: 0.5rem;
    width: 36px;
    height: 36px;
    background-color: var(--error-color);
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-size: 1.2rem;
    line-height: 1;
}

.btn-icon-only:hover {
    opacity: 0.8;
}

.btn-remove {
    flex-shrink: 0;
}

/* Select Input */
.select-input {
    padding: 0.75rem 1rem;
    font-size: 1rem;
    background-color: var(--surface-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    min-width: 180px;
}

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

/* API Card */
.api-card {
    background-color: var(--surface-elevated);
    border-radius: var(--border-radius-sm);
    padding: 1.25rem;
}

.api-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.api-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.api-category {
    background-color: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
}

.api-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.api-meta {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.meta-item {
    color: var(--text-secondary);
}

.meta-item strong {
    color: var(--text-muted);
}

/* Request Form */
.request-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.input-group {
    display: flex;
    gap: 0;
}

.method-select {
    padding: 0.75rem 1rem;
    font-size: 1rem;
    font-weight: 600;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius-sm) 0 0 var(--border-radius-sm);
    cursor: pointer;
    min-width: 100px;
}

.method-select:focus {
    outline: none;
}

.text-input {
    flex: 1;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    background-color: var(--surface-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
}

.input-group .text-input {
    border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
    border-left: none;
}

.text-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

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

.textarea-input {
    padding: 1rem;
    font-size: 0.9rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    background-color: var(--surface-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    min-height: 120px;
    resize: vertical;
}

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

/* Parameters Container */
.params-container {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.param-row {
    display: flex;
    gap: 0.5rem;
}

.param-row .text-input {
    border-radius: var(--border-radius-sm);
    border-left: 1px solid var(--border-color);
}

.param-key {
    flex: 0.4;
}

.param-value {
    flex: 0.6;
}

/* Response Display */
.response-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.response-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.status-code {
    font-weight: 700;
    font-size: 1.25rem;
    padding: 0.25rem 0.75rem;
    border-radius: var(--border-radius-sm);
}

.status-code.success {
    background-color: rgba(16, 185, 129, 0.2);
    color: var(--success-color);
}

.status-code.error {
    background-color: rgba(239, 68, 68, 0.2);
    color: var(--error-color);
}

.status-code.warning {
    background-color: rgba(245, 158, 11, 0.2);
    color: var(--warning-color);
}

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

.response-meta {
    display: flex;
    gap: 1rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Tabs */
.response-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    background: none;
    color: var(--text-muted);
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:hover {
    color: var(--text-secondary);
}

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

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.response-actions {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

/* Code Block */
.code-block {
    background-color: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 1rem;
    overflow-x: auto;
    max-height: 400px;
    overflow-y: auto;
}

.code-block code {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.85rem;
    color: var(--text-primary);
    white-space: pre-wrap;
    word-break: break-word;
}

/* JSON Syntax Highlighting */
.json-key {
    color: #f472b6;
}

.json-string {
    color: #a5d6ff;
}

.json-number {
    color: #7dd3fc;
}

.json-boolean {
    color: #fbbf24;
}

.json-null {
    color: #94a3b8;
}

/* Error Toast */
.error-toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--error-color);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    max-width: 90%;
}

.error-icon {
    font-size: 1.25rem;
}

.error-message {
    flex: 1;
}

.error-close {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    line-height: 1;
    opacity: 0.8;
}

.error-close:hover {
    opacity: 1;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(15, 23, 42, 0.8);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    z-index: 1000;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* History List */
.history-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background-color: var(--surface-elevated);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.history-item:hover {
    background-color: var(--border-color);
}

.history-name {
    font-weight: 500;
}

.history-category {
    font-size: 0.75rem;
    color: var(--text-muted);
    background-color: var(--surface-color);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

.empty-state {
    text-align: center;
    color: var(--text-muted);
    padding: 2rem;
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem 1rem;
    margin-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.footer a:hover {
    text-decoration: underline;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .header h1 {
        font-size: 1.5rem;
    }

    .logo-container {
        flex-direction: column;
        gap: 0.5rem;
    }

    .api-controls {
        flex-direction: column;
    }

    .select-input {
        width: 100%;
    }

    .btn-large {
        padding: 0.875rem 1.5rem;
    }

    .api-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .api-meta {
        flex-direction: column;
        gap: 0.5rem;
    }

    .input-group {
        flex-direction: column;
    }

    .method-select {
        width: 100%;
        border-radius: var(--border-radius-sm) var(--border-radius-sm) 0 0;
    }

    .input-group .text-input {
        border-radius: 0 0 var(--border-radius-sm) var(--border-radius-sm);
        border-left: 1px solid var(--border-color);
        border-top: none;
    }

    .param-row {
        flex-direction: column;
    }

    .param-row .text-input {
        width: 100%;
    }

    .param-key, .param-value {
        flex: 1;
    }

    .btn-icon-only.btn-remove {
        width: 100%;
    }

    .response-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .response-tabs {
        overflow-x: auto;
    }

    .code-block {
        font-size: 0.75rem;
    }

    .error-toast {
        bottom: 1rem;
        left: 1rem;
        right: 1rem;
        transform: none;
    }
}

@media (max-width: 480px) {
    .app-container {
        padding: 0.5rem;
    }

    .section {
        padding: 1rem;
    }

    .header {
        padding: 1.5rem 0.5rem;
    }

    .tagline {
        font-size: 0.95rem;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--surface-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

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

/* Focus Styles for Accessibility */
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
a:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Selection */
::selection {
    background-color: var(--primary-color);
    color: white;
}