/* ===================================
   DISCORD DUAL IMAGE GENERATOR
   Minimalist Startup Aesthetic
   =================================== */

/* CSS Variables */
:root {
    /* Discord Colors */
    --discord-blurple: #5865F2;
    --discord-blurple-dark: #4752C4;
    --discord-green: #43b581;
    --discord-orange: #faa61a;
    --discord-red: #ed4245;
    
    /* Grayscale */
    --bg-dark: #1a1a1a;
    --card-dark: #2d2d2d;
    --border-gray: #404040;
    --text-white: #ffffff;
    --text-gray: #99aab5;
    --text-muted: #72767d;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

/* ===================================
   RESET & BASE STYLES
   =================================== */

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-white);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===================================
   TYPOGRAPHY
   =================================== */

h1, h2, h3, h4 {
    font-weight: 600;
    line-height: 1.2;
}

h1 {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
}

h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

h4 {
    font-size: 1rem;
    font-weight: 500;
}

p {
    color: var(--text-gray);
}

small {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ===================================
   LAYOUT
   =================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-sm);
    flex: 1;
}

/* ===================================
   HEADER
   =================================== */

.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.subtitle {
    color: var(--text-gray);
    font-size: 1.125rem;
}

/* ===================================
   INFO SECTION (COLLAPSIBLE)
   =================================== */

.info-section {
    background: var(--card-dark);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
}

.info-toggle {
    width: 100%;
    padding: var(--spacing-md);
    background: transparent;
    border: none;
    color: var(--text-white);
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: background var(--transition-fast);
}

.info-toggle:hover {
    background: rgba(255, 255, 255, 0.05);
}

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

.toggle-arrow {
    margin-left: auto;
    transition: transform var(--transition-normal);
}

.info-toggle[aria-expanded="true"] .toggle-arrow {
    transform: rotate(180deg);
}

.info-content {
    padding: 0 var(--spacing-md) var(--spacing-md);
}

.info-content ul {
    margin: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
}

.info-content li {
    margin-bottom: var(--spacing-xs);
    color: var(--text-gray);
}

.discord-warning {
    background: rgba(250, 166, 26, 0.1);
    border-left: 3px solid var(--discord-orange);
    padding: var(--spacing-sm);
    margin-top: var(--spacing-md);
    border-radius: var(--radius-sm);
    color: var(--text-gray);
}

/* ===================================
   DEMO SECTION
   =================================== */

.demo-section {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

/* ===================================
   UPLOAD SECTION
   =================================== */

.upload-section {
    margin-bottom: var(--spacing-lg);
}

.upload-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--spacing-md);
    align-items: center;
}

.upload-card {
    background: var(--card-dark);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
}

.upload-header {
    margin-bottom: var(--spacing-sm);
}

.upload-header h3 {
    margin-bottom: var(--spacing-xs);
}

.upload-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.upload-area {
    border: 2px dashed var(--border-gray);
    border-radius: var(--radius-md);
    min-height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
}

.upload-area:hover,
.upload-area:focus {
    border-color: var(--discord-blurple);
    background: rgba(88, 101, 242, 0.05);
}

.upload-placeholder {
    text-align: center;
    padding: var(--spacing-lg);
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.upload-preview {
    width: 100%;
    height: 100%;
    position: relative;
}

.upload-preview img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.remove-btn {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: rgba(237, 66, 69, 0.9);
    color: white;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-fast);
}

.remove-btn:hover {
    background: var(--discord-red);
}

.validation-feedback {
    margin-top: var(--spacing-sm);
    font-size: 0.875rem;
    min-height: 1.5rem;
}

.validation-feedback.success {
    color: var(--discord-green);
}

.validation-feedback.warning {
    color: var(--discord-orange);
}

.validation-feedback.error {
    color: var(--discord-red);
}

/* Swap Button */
.swap-container {
    display: flex;
    align-items: center;
    justify-content: center;
}

.swap-btn {
    background: var(--discord-blurple);
    color: white;
    border: none;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    font-size: 2rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 12px rgba(88, 101, 242, 0.3);
}

.swap-btn:hover:not(:disabled) {
    background: var(--discord-blurple-dark);
    transform: scale(1.1) rotate(180deg);
}

.swap-btn:disabled {
    background: var(--border-gray);
    cursor: not-allowed;
    opacity: 0.5;
    box-shadow: none;
}

/* ===================================
   CONTROLS SECTION
   =================================== */

.controls-section {
    margin-bottom: var(--spacing-lg);
}

.controls-card {
    background: var(--card-dark);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.control-group {
    margin-bottom: var(--spacing-lg);
}

.control-group:last-of-type {
    margin-bottom: var(--spacing-md);
}

.control-group label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.control-value {
    color: var(--discord-blurple);
    font-family: 'Courier New', monospace;
}

.slider-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.slider-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    min-width: 40px;
}

.slider-label:first-child {
    text-align: right;
}

input[type="range"] {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    background: var(--border-gray);
    border-radius: 3px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--discord-blurple);
    border-radius: 50%;
    cursor: pointer;
    transition: transform var(--transition-fast);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--discord-blurple);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.control-hint {
    display: block;
    margin-top: var(--spacing-xs);
}

.radio-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.radio-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border: 2px solid var(--border-gray);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.radio-label:hover {
    border-color: var(--discord-blurple);
    background: rgba(88, 101, 242, 0.05);
}

.radio-label input[type="radio"] {
    cursor: pointer;
}

.radio-label input[type="radio"]:checked + span {
    color: var(--discord-blurple);
    font-weight: 500;
}

.recommended-badge {
    margin-left: auto;
    background: var(--discord-green);
    color: white;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
}

/* File Size Indicator */
.file-size-indicator {
    background: rgba(255, 255, 255, 0.05);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.file-size-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
}

.file-size-value {
    font-family: 'Courier New', monospace;
    font-weight: 600;
    color: var(--discord-green);
}

.file-size-bar {
    height: 8px;
    background: var(--border-gray);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: var(--spacing-xs);
}

.file-size-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--discord-green), var(--discord-blurple));
    transition: width var(--transition-normal);
}

.file-size-progress.warning {
    background: var(--discord-orange);
}

.file-size-progress.error {
    background: var(--discord-red);
}

.file-size-limit {
    display: block;
}

/* ===================================
   PREVIEW SECTION
   =================================== */

.preview-section {
    margin-bottom: var(--spacing-lg);
}

.preview-card {
    background: var(--card-dark);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.preview-description {
    margin-bottom: var(--spacing-lg);
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

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

.preview-label {
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
}

.preview-container {
    background: rgba(0, 0, 0, 0.3);
    border: 2px solid var(--border-gray);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
}

.preview-container.thumbnail-size {
    height: 200px;
}

.preview-container.full-size {
    height: 400px;
}

.preview-container canvas {
    max-width: 100%;
    max-height: 100%;
    border-radius: var(--radius-sm);
}

.preview-container img {
    max-width: 100%;
    max-height: 100%;
    border-radius: var(--radius-sm);
}

.preview-note {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: rgba(88, 101, 242, 0.1);
    border-left: 3px solid var(--discord-blurple);
    border-radius: var(--radius-sm);
    color: var(--text-gray);
}

/* ===================================
   DOWNLOAD SECTION
   =================================== */

.download-section {
    margin-bottom: var(--spacing-lg);
}

.download-card {
    background: var(--card-dark);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.download-info {
    margin-bottom: var(--spacing-lg);
}

.download-stats {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.stat {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-sm);
}

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

.stat-value {
    font-weight: 500;
    font-family: 'Courier New', monospace;
}

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

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

.stat-value.error {
    color: var(--discord-red);
}

.discord-tips {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: rgba(88, 101, 242, 0.1);
    border-left: 3px solid var(--discord-blurple);
    border-radius: var(--radius-sm);
}

.discord-tips h4 {
    margin-bottom: var(--spacing-sm);
}

.discord-tips ul {
    padding-left: var(--spacing-lg);
}

.discord-tips li {
    margin-bottom: var(--spacing-xs);
    color: var(--text-gray);
}

/* ===================================
   BUTTONS
   =================================== */

.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: inherit;
}

.btn-primary {
    background: var(--discord-blurple);
    color: white;
    box-shadow: 0 2px 8px rgba(88, 101, 242, 0.3);
}

.btn-primary:hover {
    background: var(--discord-blurple-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(88, 101, 242, 0.4);
}

.btn-secondary {
    background: var(--card-dark);
    color: var(--text-white);
    border: 2px solid var(--border-gray);
}

.btn-secondary:hover {
    border-color: var(--discord-blurple);
    background: rgba(88, 101, 242, 0.1);
}

.btn-text {
    background: transparent;
    color: var(--text-gray);
    padding: var(--spacing-sm);
}

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

.btn-large {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1.125rem;
    justify-content: center;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* ===================================
   RESET SECTION
   =================================== */

.reset-section {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

/* ===================================
   FOOTER
   =================================== */

.footer {
    text-align: center;
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-gray);
    color: var(--text-muted);
}

.footer p {
    margin-bottom: var(--spacing-xs);
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */

@media (max-width: 768px) {
    .upload-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .swap-container {
        order: 3;
        margin-top: var(--spacing-sm);
    }
    
    .swap-btn {
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
        transform: rotate(90deg);
    }
    
    .swap-btn:hover:not(:disabled) {
        transform: rotate(270deg) scale(1.1);
    }
    
    .preview-grid {
        grid-template-columns: 1fr;
    }
    
    .preview-container.full-size {
        height: 300px;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
}

/* ===================================
   ACCESSIBILITY
   =================================== */

*:focus {
    outline: 2px solid var(--discord-blurple);
    outline-offset: 2px;
}

button:focus {
    outline-offset: 4px;
}

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

/* ===================================
   ANIMATIONS
   =================================== */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.controls-section,
.preview-section,
.download-section {
    animation: fadeIn 0.4s ease;
}

/* ===================================
   LOADING STATE
   =================================== */

.loading {
    pointer-events: none;
    opacity: 0.6;
    position: relative;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 40px;
    height: 40px;
    margin: -20px 0 0 -20px;
    border: 4px solid var(--border-gray);
    border-top-color: var(--discord-blurple);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ============================================
   PROGRESS OVERLAY
   ============================================ */

.progress-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    animation: fadeIn 0.2s ease;
}

.progress-overlay[hidden] {
    display: none !important;
}

.progress-card {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    max-width: 400px;
    width: 90%;
    text-align: center;
    animation: slideUp 0.3s ease;
}

.progress-spinner {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-lg);
    border: 4px solid var(--border-color);
    border-top-color: var(--discord-blurple);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.progress-card h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-size: 1.5rem;
}

.progress-card p {
    color: var(--text-gray);
    margin-bottom: var(--spacing-lg);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--border-color);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--discord-blurple), var(--accent-green));
    border-radius: var(--radius-full);
    transition: width 0.3s ease;
    width: 0%;
}

.progress-card small {
    color: var(--text-gray);
    font-weight: 600;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}