/* AI Prompt-Reply JSON Converter - Enhanced Styles */

:root {
    /* Monokai Pro Dark (Filter Spectrum) Color Palette */
    --primary-gradient: linear-gradient(135deg, #fc9867 0%, #fd6a85 100%);
    --secondary-gradient: linear-gradient(135deg, #78dce8 0%, #ab9df2 100%);
    --success-gradient: linear-gradient(135deg, #a9dc76 0%, #7bd88f 100%);
    --warning-gradient: linear-gradient(135deg, #ffd866 0%, #ffcc95 100%);
    --error-gradient: linear-gradient(135deg, #ff6188 0%, #fc9867 100%);
    --background-gradient: linear-gradient(135deg, #2d2a2e 0%, #221f22 100%);
    
    --primary-color: #fc9867;
    --primary-dark: #fd6a85;
    --secondary-color: #78dce8;
    --success-color: #a9dc76;
    --success-color-dark: #72944f;
    --warning-color: #ffd866;
    --error-color: #ff6188;
    --text-primary: #fcfcfa;
    --text-secondary: #c1c0c0;
    --text-muted: #939293;
    --border-color: #403e41;
    --border-light: #5b595c;
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    --transition-fast: all 0.15s ease;
    --transition-normal: all 0.3s ease;
    --transition-slow: all 0.5s ease;
    
    /* Enhanced Typography Scale */
    --font-size-xs: 0.75rem;     /* 12px */
    --font-size-sm: 0.875rem;    /* 14px */
    --font-size-base: 1rem;      /* 16px */
    --font-size-lg: 1.125rem;    /* 18px */
    --font-size-xl: 1.25rem;     /* 20px */
    --font-size-2xl: 1.5rem;     /* 24px */
    --font-size-3xl: 1.875rem;   /* 30px */
    --font-size-4xl: 2.25rem;    /* 36px */
    
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    
    --letter-spacing-tight: -0.025em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.025em;
    --letter-spacing-wider: 0.05em;
    --letter-spacing-widest: 0.1em;
}

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

/* Enhanced Typography System */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--background-gradient);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-primary);
    line-height: var(--line-height-normal);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    letter-spacing: var(--letter-spacing-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    font-feature-settings: "kern" 1, "liga" 1, "calt" 1;
    font-variant-ligatures: common-ligatures;
}

/* Premium Typography Enhancements */
h1, h2, h3, h4, h5, h6 {
    font-feature-settings: "kern" 1, "liga" 1, "calt" 1;
    font-variant-ligatures: common-ligatures;
    text-rendering: optimizeLegibility;
}

p, li, span, div {
    font-feature-settings: "kern" 1;
    text-rendering: optimizeLegibility;
}

/* Enhanced Code Typography */
code, pre, .format-example {
    font-family: 'JetBrains Mono', 'Fira Code', 'Source Code Pro', 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-feature-settings: "kern" 1, "liga" 1, "calt" 1;
    font-variant-ligatures: common-ligatures;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: #2d2a2e;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    position: relative;
    border: 1px solid var(--border-color);
}

.container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
    z-index: 1;
}

/* Enhanced Header with Micro-animations */
.header {
    background: var(--primary-gradient);
    padding: 64px 40px;
    text-align: center;
    color: white;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="rgba(255,255,255,0.05)"/><circle cx="25" cy="25" r="0.5" fill="rgba(255,255,255,0.03)"/><circle cx="75" cy="75" r="0.5" fill="rgba(255,255,255,0.03)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.4;
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-10px) rotate(0.5deg); }
}

.header * {
    position: relative;
    z-index: 2;
}

.header h1 {
    font-size: clamp(var(--font-size-2xl), 4vw, var(--font-size-4xl));
    font-weight: var(--font-weight-bold);
    margin-bottom: 20px;
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
    letter-spacing: var(--letter-spacing-tight);
    line-height: var(--line-height-tight);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

.header h1 i {
    font-size: 0.9em;
    opacity: 0.95;
    animation: gearRotate 10s linear infinite;
}

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

.header p {
    font-size: var(--font-size-lg);
    opacity: 0.96;
    font-weight: var(--font-weight-normal);
    max-width: 650px;
    margin: 0 auto;
    line-height: var(--line-height-relaxed);
    letter-spacing: var(--letter-spacing-wide);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 6px 16px;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    margin-top: 20px;
    backdrop-filter: blur(10px);
    letter-spacing: var(--letter-spacing-wide);
    text-transform: uppercase;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.content {
    padding: 56px 40px;
}

.section {
    margin-bottom: 48px;
}

.section:last-child {
    margin-bottom: 0;
}

/* Enhanced Typography */
.section-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    letter-spacing: var(--letter-spacing-tight);
    line-height: var(--line-height-tight);
}

.section-title i {
    font-size: 1.2em;
    color: var(--primary-color);
}

/* Flow Selector Enhanced */
.flow-selector {
    background: linear-gradient(135deg, rgba(120, 220, 232, 0.05) 0%, rgba(171, 157, 242, 0.05) 100%);
    border: 2px solid rgba(120, 220, 232, 0.15);
    border-radius: var(--radius-xl);
    padding: 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.flow-selector::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 60 60"><defs><pattern id="dots" width="20" height="20" patternUnits="userSpaceOnUse"><circle cx="10" cy="10" r="1" fill="rgba(120,220,232,0.08)"/></pattern></defs><rect width="60" height="60" fill="url(%23dots)"/></svg>');
    opacity: 0.5;
}

.flow-selector * {
    position: relative;
    z-index: 2;
}

.flow-selector .section-title {
    color: var(--primary-color);
    margin-bottom: 32px;
    justify-content: center;
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
}

.flow-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    max-width: 680px;
    margin: 0 auto;
}

.flow-option {
    background: #403e41;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px;
    cursor: pointer;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
    text-align: left;
}

.flow-option::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--primary-gradient);
    opacity: 0;
    transition: var(--transition-normal);
}

.flow-option * {
    position: relative;
    z-index: 2;
    transition: var(--transition-normal);
}

.flow-option:hover {
    border-color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    background: #4a4751;
}

.flow-option:hover::before {
    opacity: 0.1;
}

.flow-option.active {
    background: var(--primary-gradient);
    color: #2d2a2e;
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.flow-option.active::before {
    opacity: 0;
}

.flow-option h4 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    letter-spacing: var(--letter-spacing-tight);
    line-height: var(--line-height-tight);
}

.flow-option h4 i {
    font-size: 1.1em;
    opacity: 0.9;
}

.flow-option p {
    font-size: var(--font-size-sm);
    opacity: 0.85;
    line-height: var(--line-height-relaxed);
    margin-bottom: 16px;
}

.flow-option.active p {
    opacity: 0.95;
}

.flow-option .feature-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.flow-option .feature-list li {
    font-size: var(--font-size-xs);
    opacity: 0.75;
    margin-bottom: 6px;
    padding-left: 20px;
    position: relative;
    line-height: var(--line-height-normal);
}

.flow-option.active .feature-list li {
    opacity: 0.9;
}

.flow-option .feature-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 4px;
    background: var(--success-color);
    border-radius: 50%;
}

.flow-option.active .feature-list li::before {
    background: rgba(255, 255, 255, 0.9);
}

/* File Upload Enhanced */
.file-upload-area {
    margin-bottom: 40px;
}

.file-section {
    background: linear-gradient(135deg, rgba(252, 152, 103, 0.08) 0%, rgba(253, 106, 133, 0.08) 100%);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    margin: 20px 0;
    text-align: center;
    transition: var(--transition-normal);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.file-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, rgba(252, 152, 103, 0.15) 0%, transparent 70%);
    opacity: 0;
    transition: var(--transition-normal);
}

.file-section * {
    position: relative;
    z-index: 2;
}

.file-section:hover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, rgba(252, 152, 103, 0.15) 0%, rgba(253, 106, 133, 0.15) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.file-section:hover::before {
    opacity: 1;
}

.file-section.dragover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, rgba(252, 152, 103, 0.2) 0%, rgba(253, 106, 133, 0.2) 100%);
    transform: scale(1.02);
}

.file-section.has-file {
    border-color: var(--success-color);
    background: linear-gradient(135deg, rgba(169, 220, 118, 0.15) 0%, rgba(123, 216, 143, 0.15) 100%);
    border-style: solid;
}

.file-section.has-file::before {
    background: radial-gradient(circle at center, rgba(169, 220, 118, 0.2) 0%, transparent 70%);
    opacity: 1;
}

.file-input {
    display: none;
}

.file-upload-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 24px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: white;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.file-upload-icon::before {
    content: '';
    position: absolute;
    inset: 3px;
    background: inherit;
    border-radius: 50%;
    z-index: -1;
}

.file-section:hover .file-upload-icon {
    transform: scale(1.15) rotate(5deg);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.3);
}

.file-section.has-file .file-upload-icon {
    background: var(--success-gradient);
    animation: successPulse 0.6s ease;
}

@keyframes successPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.file-section.has-file .file-upload-icon i {
    animation: bounce 0.8s ease;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    25% { transform: translateY(-8px); }
    50% { transform: translateY(-4px); }
    75% { transform: translateY(-2px); }
}

.file-label {
    display: block;
    font-size: var(--font-size-xl);
    color: var(--text-primary);
    font-weight: var(--font-weight-semibold);
    margin-bottom: 12px;
    letter-spacing: var(--letter-spacing-tight);
}

.file-section.has-file .file-label {
    color: var(--success-color);
}

.file-info {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: 8px;
    line-height: var(--line-height-normal);
}

.file-requirements {
    color: var(--text-muted);
    font-size: var(--font-size-xs);
    margin-top: 12px;
    font-style: italic;
    line-height: var(--line-height-normal);
}

.file-name {
    color: var(--success-color);
    font-weight: var(--font-weight-semibold);
    margin-top: 16px;
    font-size: var(--font-size-sm);
    padding: 10px 18px;
    background: rgba(16, 185, 129, 0.1);
    border-radius: var(--radius-md);
    display: inline-block;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.file-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

/* Format Info Enhanced */
.format-info {
    background: linear-gradient(135deg, rgba(255, 216, 102, 0.12) 0%, rgba(255, 204, 149, 0.12) 100%);
    border: 1px solid rgba(255, 216, 102, 0.3);
    border-radius: var(--radius-lg);
    padding: 40px;
    margin: 40px 0;
    position: relative;
    overflow: hidden;
}

.format-info::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 40 40"><defs><pattern id="stripes" width="8" height="8" patternUnits="userSpaceOnUse" patternTransform="rotate(45)"><rect width="4" height="8" fill="rgba(255,216,102,0.08)"/></pattern></defs><rect width="40" height="40" fill="url(%23stripes)"/></svg>');
    opacity: 0.3;
}

.format-info * {
    position: relative;
    z-index: 2;
}

.format-info .section-title {
    color: var(--warning-color);
    margin-bottom: 24px;
    font-size: var(--font-size-xl);
}

.format-section {
    margin-bottom: 32px;
}

.format-section:last-child {
    margin-bottom: 0;
}

.format-section h4 {
    color: var(--text-primary);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: 16px;
    padding-left: 20px;
    position: relative;
    letter-spacing: var(--letter-spacing-tight);
    line-height: var(--line-height-tight);
}

.format-section h4::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    background: var(--warning-color);
    border-radius: 50%;
}

.format-section p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: 16px;
    line-height: var(--line-height-relaxed);
}

.format-example {
    background: rgba(45, 42, 46, 0.9);
    border: 1px solid rgba(255, 216, 102, 0.3);
    padding: 20px;
    border-radius: var(--radius-md);
    font-family: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: var(--font-size-xs);
    color: var(--text-primary);
    margin: 16px 0;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-word;
    position: relative;
    line-height: var(--line-height-relaxed);
}

.format-example::before {
    content: 'Example';
    position: absolute;
    top: 12px;
    right: 16px;
    background: var(--warning-color);
    color: #2d2a2e;
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-widest);
}

.format-example code {
    background: rgba(255, 216, 102, 0.2);
    padding: 3px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.9em;
    color: var(--warning-color);
    font-weight: var(--font-weight-semibold);
}

/* Enhanced Convert Button with Premium Design */
.convert-btn {
    width: 100%;
    background: var(--primary-gradient);
    color: white;
    border: none;
    padding: 28px 64px;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    cursor: pointer;
    transition: var(--transition-normal);
    margin: 56px 0;
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wider);
    border: 3px solid transparent;
    font-family: 'Inter', sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    min-height: 78px;
    box-shadow: var(--shadow-lg);
    background-image: var(--primary-gradient);
}

.convert-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: var(--transition-slow);
}

.convert-btn::after {
    content: '';
    position: absolute;
    inset: 3px;
    background: inherit;
    border-radius: calc(var(--radius-lg) - 3px);
    z-index: -1;
}

.convert-btn:hover:not(:disabled)::before {
    left: 100%;
}

.convert-btn:hover:not(:disabled) {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(255, 255, 255, 0.3);
    background-image: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 50%, var(--primary-dark) 100%);
}

.convert-btn:active:not(:disabled) {
    transform: translateY(-2px);
    transition: var(--transition-fast);
    box-shadow: var(--shadow-lg);
}

.convert-btn:focus:not(:disabled) {
    outline: none;
    box-shadow: var(--shadow-xl), 0 0 0 3px rgba(252, 152, 103, 0.4);
}

.convert-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    background: linear-gradient(135deg, var(--text-muted) 0%, var(--border-color) 100%);
    box-shadow: var(--shadow-sm);
}

.convert-btn .btn-icon {
    font-size: 1.4em;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

.convert-btn:hover:not(:disabled) .btn-icon {
    animation: spin 1s linear infinite;
}

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

.progress-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    overflow: hidden;
    opacity: 0;
    transition: var(--transition-normal);
}

.progress-bar.show {
    opacity: 1;
}

.progress-fill {
    height: 100%;
    background: rgba(255, 255, 255, 0.8);
    width: 0%;
    transition: width 0.3s ease;
}

/* Result Section Enhanced */
.result-section {
    background: linear-gradient(135deg, rgba(169, 220, 118, 0.12) 0%, rgba(123, 216, 143, 0.12) 100%);
    border: 2px solid rgba(169, 220, 118, 0.3);
    border-radius: var(--radius-lg);
    padding: 40px;
    margin: 40px 0;
    display: none;
    position: relative;
    overflow: hidden;
}

.result-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 60 60"><defs><pattern id="success-dots" width="20" height="20" patternUnits="userSpaceOnUse"><circle cx="10" cy="10" r="1.5" fill="rgba(169,220,118,0.15)"/></pattern></defs><rect width="60" height="60" fill="url(%23success-dots)"/></svg>');
    opacity: 0.5;
}

.result-section * {
    position: relative;
    z-index: 2;
}

.result-section.show {
    display: block;
    animation: slideInUp 0.5s ease;
}

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

.result-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.result-header .success-icon {
    width: 56px;
    height: 56px;
    background: var(--success-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
}

.result-header h3 {
    color: var(--success-color);
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    margin: 0;
    letter-spacing: var(--letter-spacing-tight);
}

.result-description {
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    margin-bottom: 28px;
    line-height: var(--line-height-relaxed);
}

.result-stats {
    background: rgba(255, 255, 255, 0.7);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 28px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 20px;
}

.stat-item {
    text-align: center;
}

.stat-value {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--success-color-dark);
    display: block;
    line-height: var(--line-height-tight);
}

.stat-label {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-widest);
    font-weight: var(--font-weight-medium);
    margin-top: 4px;
}

.result-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.download-btn, .copy-btn {
    background: var(--success-gradient);
    color: white;
    border: none;
    padding: 16px 28px;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
    min-width: 160px;
    justify-content: center;
    font-family: inherit;
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
}

.copy-btn {
    background: var(--secondary-gradient);
}

.download-btn:hover {
    background: var(--success-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.copy-btn:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-icon {
    font-size: 1.1em;
}

/* Warning Enhanced */
.warning {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.08) 0%, rgba(220, 38, 38, 0.08) 100%);
    border: 2px solid rgba(239, 68, 68, 0.2);
    color: var(--error-color);
    padding: 24px;
    border-radius: var(--radius-md);
    margin: 32px 0;
    display: none;
    position: relative;
    overflow: hidden;
}

.warning::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 40 40"><defs><pattern id="warning-stripes" width="8" height="8" patternUnits="userSpaceOnUse" patternTransform="rotate(45)"><rect width="4" height="8" fill="rgba(239,68,68,0.05)"/></pattern></defs><rect width="40" height="40" fill="url(%23warning-stripes)"/></svg>');
    opacity: 0.3;
}

.warning * {
    position: relative;
    z-index: 2;
}

.warning.show {
    display: block;
    animation: shake 0.5s ease;
}

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

.warning-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 12px;
}

.warning-icon {
    width: 36px;
    height: 36px;
    background: var(--error-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
    font-weight: bold;
}

.warning strong {
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-lg);
}

/* Notification System */
.notification {
    position: fixed;
    top: 24px;
    right: 24px;
    background: var(--success-gradient);
    color: white;
    padding: 18px 24px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 14px;
    z-index: 1000;
    animation: slideInRight 0.3s ease;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    max-width: 400px;
}

.notification.error {
    background: var(--error-gradient);
}

.notification-icon {
    font-size: var(--font-size-lg);
    opacity: 0.9;
}

.notification-message {
    line-height: var(--line-height-normal);
    flex: 1;
}

@keyframes slideInRight {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 16px;
    }

    .container {
        border-radius: var(--radius-lg);
    }

    .header {
        padding: 40px 28px;
    }

    .header h1 {
        font-size: var(--font-size-2xl);
        flex-direction: column;
        gap: 8px;
    }

    .header p {
        font-size: var(--font-size-base);
    }

    .content {
        padding: 40px 28px;
    }

    .flow-selector {
        padding: 28px;
    }

    .flow-options {
        grid-template-columns: 1fr;
        gap: 20px;
    }

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

    .file-section {
        padding: 28px;
    }

    .format-info {
        padding: 28px;
    }

    .result-actions {
        flex-direction: column;
    }

    .download-btn, .copy-btn {
        flex: none;
    }

    .convert-btn {
        padding: 20px 40px;
        font-size: var(--font-size-base);
    }
}

@media (max-width: 480px) {
    body {
        padding: 12px;
    }

    .header {
        padding: 32px 20px;
    }

    .header h1 {
        font-size: var(--font-size-xl);
    }

    .content {
        padding: 32px 20px;
    }

    .flow-option {
        padding: 24px;
    }

    .file-section {
        padding: 24px;
    }

    .convert-btn {
        padding: 18px 32px;
        font-size: var(--font-size-sm);
        min-height: 60px;
    }

    .format-info {
        padding: 24px;
    }

    .notification {
        top: 16px;
        right: 16px;
        left: 16px;
        max-width: none;
    }
}

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

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus States */
.flow-option:focus,
.file-section:focus,
.convert-btn:focus,
.download-btn:focus,
.copy-btn:focus {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

/* Loading State */
.loading {
    opacity: 0.7;
    pointer-events: none;
}

.loading .convert-btn {
    background: var(--text-muted);
    cursor: not-allowed;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000;
        --text-muted: #333;
        --text-secondary: #222;
    }
    
    .flow-option:hover,
    .file-section:hover {
        border-width: 3px;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #fcfcfa;
        --text-secondary: #c1c0c0;
        --text-muted: #939293;
        --border-color: #403e41;
        --border-light: #5b595c;
        --background-gradient: linear-gradient(135deg, #2d2a2e 0%, #221f22 100%);
    }
    
    .container {
        background: #2d2a2e;
    }
    
    .flow-option {
        background: #403e41;
        border-color: #5b595c;
    }
    
    .file-section {
        background: linear-gradient(135deg, rgba(252, 152, 103, 0.08) 0%, rgba(253, 106, 133, 0.08) 100%);
    }
    
    .format-example {
        background: rgba(45, 42, 46, 0.9);
        color: #fcfcfa;
    }
}