/* ===================================
   STRESS TESTING TOOL - DESIGN SYSTEM
   Enhanced with Light Theme Support
   =================================== */

/* Import Modern Typography */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ===================================
   CSS VARIABLES - DESIGN TOKENS
   =================================== */
:root {
    /* Dark Theme Colors */
    --color-bg-primary: #0a0e1a;
    --color-bg-secondary: #131829;
    --color-bg-tertiary: #1a2035;
    --color-bg-glass: rgba(26, 32, 53, 0.7);
    --color-bg-glass-hover: rgba(26, 32, 53, 0.85);

    /* Accent Colors */
    --color-accent-primary: #6366f1;
    --color-accent-secondary: #8b5cf6;
    --color-accent-success: #10b981;
    --color-accent-warning: #f59e0b;
    --color-accent-danger: #ef4444;
    --color-accent-info: #3b82f6;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --gradient-danger: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    --gradient-warning: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);

    /* Text Colors */
    --color-text-primary: #f8fafc;
    --color-text-secondary: #cbd5e1;
    --color-text-tertiary: #94a3b8;
    --color-text-muted: #64748b;

    /* Border & Shadow */
    --color-border: rgba(148, 163, 184, 0.1);
    --color-border-hover: rgba(148, 163, 184, 0.2);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme */
[data-theme="light"] {
    --color-bg-primary: #f8fafc;
    --color-bg-secondary: #f1f5f9;
    --color-bg-tertiary: #e2e8f0;
    --color-bg-glass: rgba(255, 255, 255, 0.8);
    --color-bg-glass-hover: rgba(255, 255, 255, 0.95);

    --color-text-primary: #0f172a;
    --color-text-secondary: #334155;
    --color-text-tertiary: #475569;
    --color-text-muted: #64748b;

    --color-border: rgba(148, 163, 184, 0.2);
    --color-border-hover: rgba(148, 163, 184, 0.3);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
}

/* ===================================
   GLOBAL RESET & BASE STYLES
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

/* Animated Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 30%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* ===================================
   LAYOUT STRUCTURE
   =================================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    position: relative;
    z-index: 1;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    animation: fadeInDown 0.6s ease-out;
    position: relative;
    display: block;
}

.header-content {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.title {
    font-size: 3rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0;
    line-height: 1.2;
}

.title-icon {
    width: 2.5rem;
    height: 2.5rem;
    stroke: url(#gradient);
    /* Note: SVG needs defs for this, or we use currentColor */
    color: var(--color-accent-primary);
    filter: drop-shadow(0 0 10px rgba(99, 102, 241, 0.5));
    margin-bottom: var(--spacing-xs);
}

.subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    font-weight: 300;
    margin-bottom: var(--spacing-sm);
}

.header-controls {
    position: absolute;
    top: 0;
    right: 0;
}

/* YouTube Link */
.youtube-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, #FF0000 0%, #CC0000 100%);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.875rem;
    box-shadow: 0 2px 8px rgba(255, 0, 0, 0.3);
    transition: all var(--transition-base);
    animation: pulse-glow 2s ease-in-out infinite;
    margin-top: var(--spacing-md);
}

.youtube-link:hover {
    transform: translateY(-2px) scale(1.03);
    box-shadow: 0 4px 15px rgba(255, 0, 0, 0.5);
    animation: none;
    color: white;
}

.youtube-icon {
    width: 1.25rem;
    height: 1.25rem;
    flex-shrink: 0;
}

@keyframes pulse-glow {

    0%,
    100% {
        box-shadow: 0 2px 8px rgba(255, 0, 0, 0.3);
    }

    50% {
        box-shadow: 0 2px 15px rgba(255, 0, 0, 0.5);
    }
}

/* Footer */
.footer {
    text-align: center;
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* Main Grid Layout */
.main-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

/* ===================================
   GLASS PANEL COMPONENT
   =================================== */
.panel {
    background: var(--color-bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.panel:hover {
    background: var(--color-bg-glass-hover);
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-lg);
}

.panel-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.panel-icon {
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    font-size: 1.25rem;
}

.panel-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
}

.panel-section {
    margin-top: var(--spacing-lg);
}

.section-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

/* ===================================
   PRESET CONTROLS
   =================================== */
.preset-controls {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.preset-controls select {
    flex: 1;
}

.keyboard-shortcuts {
    padding: var(--spacing-sm);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    text-align: center;
}

.keyboard-shortcuts small {
    color: var(--color-text-tertiary);
}

/* ===================================
   FORM CONTROLS
   =================================== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-family: var(--font-primary);
    font-size: 0.9375rem;
    transition: all var(--transition-base);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

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

.form-textarea {
    resize: vertical;
    min-height: 100px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
}

.help-text {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* Checkbox */
.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-weight: 500;
}

.form-checkbox {
    width: 1.25rem;
    height: 1.25rem;
    cursor: pointer;
}

/* Crawler Section */
.crawler-section {
    background: var(--color-bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.crawler-settings {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    border: 1px dashed var(--color-border);
}

/* Range Slider */
.form-range {
    width: 100%;
    height: 6px;
    background: var(--color-bg-tertiary);
}

.form-range::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--gradient-primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

.range-value {
    display: inline-block;
    margin-left: var(--spacing-sm);
    padding: 0.25rem 0.75rem;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--color-accent-primary);
}

/* ===================================
   BUTTONS
   =================================== */
.btn {
    padding: 0.875rem 1.75rem;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

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

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow), var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-success {
    background: var(--gradient-success);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-success:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.3), var(--shadow-md);
}

.btn-danger {
    background: var(--gradient-danger);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-danger:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.3), var(--shadow-md);
}

.btn-warning {
    background: var(--gradient-warning);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-warning:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(245, 158, 11, 0.3), var(--shadow-md);
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--color-bg-glass);
    border-color: var(--color-border-hover);
}

/* Button Group */
.btn-group {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* ===================================
   STATISTICS CARDS
   =================================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-base);
}

.stat-card:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-card-large {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-text-primary);
    line-height: 1;
}

.stat-value.success {
    color: var(--color-accent-success);
}

.stat-value.danger {
    color: var(--color-accent-danger);
}

.stat-value.warning {
    color: var(--color-accent-warning);
}

.stat-value.info {
    color: var(--color-accent-info);
}

/* ===================================
   CHARTS & VISUALIZATIONS
   =================================== */
.chart-container {
    position: relative;
    height: 300px;
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

/* ===================================
   REQUEST HISTORY TABLE
   =================================== */
.request-history-container {
    max-height: 400px;
    overflow-y: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.request-history-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.request-history-table thead {
    position: sticky;
    top: 0;
    background: var(--color-bg-tertiary);
    z-index: 10;
}

.request-history-table th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.75rem;
    border-bottom: 2px solid var(--color-border);
}

.request-history-table td {
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-primary);
}

.request-history-table tr.success-row {
    background: rgba(16, 185, 129, 0.05);
}

.request-history-table tr.error-row {
    background: rgba(239, 68, 68, 0.05);
}

.request-history-table tr:hover {
    background: var(--color-bg-glass);
}

.url-cell {
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.status-code {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.75rem;
}

.status-code.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-accent-success);
}

.status-code.error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-accent-danger);
}

/* ===================================
   STATUS INDICATORS
   =================================== */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.375rem 0.875rem;
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.status-badge::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.status-idle {
    background: rgba(148, 163, 184, 0.1);
    color: var(--color-text-tertiary);
}

.status-idle::before {
    background: var(--color-text-tertiary);
}

.status-running {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-accent-success);
}

.status-running::before {
    background: var(--color-accent-success);
}

.status-paused {
    background: rgba(245, 158, 11, 0.1);
    color: var(--color-accent-warning);
}

.status-paused::before {
    background: var(--color-accent-warning);
}

.status-error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-accent-danger);
}

.status-error::before {
    background: var(--color-accent-danger);
}

/* ===================================
   PROGRESS BAR
   =================================== */
.progress-container {
    width: 100%;
    height: 8px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-top: var(--spacing-md);
}

.progress-bar {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    transition: width var(--transition-base);
    position: relative;
    overflow: hidden;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg,
            transparent,
            rgba(255, 255, 255, 0.3),
            transparent);
    animation: shimmer 2s infinite;
}

/* ===================================
   RESULTS TABLE
   =================================== */
.results-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-lg);
    font-size: 0.875rem;
}

.results-table th {
    background: var(--color-bg-tertiary);
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.75rem;
    border-bottom: 2px solid var(--color-border);
}

.results-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-primary);
}

.results-table tr:hover {
    background: var(--color-bg-tertiary);
}

.results-table code {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--color-accent-primary);
}

/* ===================================
   ACCORDION
   =================================== */
.accordion {
    margin-bottom: var(--spacing-md);
}

.accordion-header {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-family: var(--font-primary);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all var(--transition-base);
}

.accordion-header:hover {
    background: var(--color-bg-glass);
    border-color: var(--color-border-hover);
}

.accordion-icon {
    transition: transform var(--transition-base);
}

.accordion-header.active .accordion-icon {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.accordion-content.active {
    max-height: 1000px;
    padding-top: var(--spacing-md);
}

/* ===================================
   ANIMATIONS
   =================================== */
@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }

    100% {
        transform: translateX(100%);
    }
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn var(--transition-base) ease-out;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */
@media (max-width: 1024px) {
    .main-grid {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }

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

@media (max-width: 640px) {
    .container {
        padding: var(--spacing-md);
    }

    .header h1 {
        font-size: 2rem;
    }

    .header p {
        font-size: 1rem;
    }

    .panel {
        padding: var(--spacing-md);
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

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

    .btn {
        width: 100%;
    }

    .request-history-table {
        font-size: 0.75rem;
    }

    .request-history-table th,
    .request-history-table td {
        padding: var(--spacing-xs);
    }
}

/* ===================================
   UTILITY CLASSES
   =================================== */
.text-center {
    text-align: center;
}

.mt-1 {
    margin-top: var(--spacing-xs);
}

.mt-2 {
    margin-top: var(--spacing-sm);
}

.mt-3 {
    margin-top: var(--spacing-md);
}

.mt-4 {
    margin-top: var(--spacing-lg);
}

.mb-1 {
    margin-bottom: var(--spacing-xs);
}

.mb-2 {
    margin-bottom: var(--spacing-sm);
}

.mb-3 {
    margin-bottom: var(--spacing-md);
}

.mb-4 {
    margin-bottom: var(--spacing-lg);
}

.hidden {
    display: none;
}

.full-width {
    grid-column: 1 / -1;
}