/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* WhatsApp color palette */
    --whatsapp-green: #075e54;
    --whatsapp-light-green: #25d366;
    --whatsapp-blue: #34b7f1;
    --whatsapp-gray: #ece5dd;

    /* UI colors */
    --primary-color: var(--whatsapp-green);
    --secondary-color: var(--whatsapp-light-green);
    --accent-color: var(--whatsapp-blue);
    --background-color: #f8f9fa;
    --card-background: #ffffff;
    --border-color: #e1e8ed;
    --text-primary: #14171a;
    --text-secondary: #657786;
    --success-color: #1da1f2;
    --error-color: #e0245e;
    --warning-color: #ffad1f;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-xxl: 1.5rem;

    /* Borders */
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --border-width: 1px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Base styles */
body {
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--background-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
.header {
    padding: var(--spacing-lg) 0;
    border-bottom: var(--border-width) solid var(--border-color);
    margin-bottom: var(--spacing-xl);
}

.header-content {
    text-align: center;
}

.logo {
    font-size: var(--font-size-xxl);
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    font-size: 1.5em;
}

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

/* Main content */
.main {
    flex: 1;
    margin-bottom: var(--spacing-xl);
}

/* Converters grid */
.converters-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

@media (min-width: 768px) {
    .converters-grid {
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    }
}

@media (min-width: 1024px) {
    .converters-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Converter modules */
.converter-module {
    background: var(--card-background);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: box-shadow var(--transition-normal);
}

.converter-module:hover {
    box-shadow: var(--shadow-md);
}

.module-header {
    padding: var(--spacing-lg);
    border-bottom: var(--border-width) solid var(--border-color);
    text-align: center;
}

.module-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.module-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.module-description {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.module-content {
    padding: var(--spacing-lg);
}

/* Upload areas */
.upload-area {
    margin-bottom: var(--spacing-lg);
}

.upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-normal);
    cursor: pointer;
    position: relative;
    min-height: 120px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.upload-zone:hover {
    border-color: var(--primary-color);
    background-color: #f8fffe;
}

.upload-zone.drag-over {
    border-color: var(--secondary-color);
    background-color: #f0fff4;
    transform: scale(1.02);
}

.upload-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    opacity: 0.7;
}

.upload-text {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.upload-link {
    color: var(--primary-color);
    text-decoration: underline;
    cursor: pointer;
}

.upload-link:hover {
    color: var(--secondary-color);
}

/* File list */
.file-list {
    margin: var(--spacing-lg) 0;
}

.file-item {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--background-color);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-sm);
}

.file-info {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    flex: 1 1 240px;
    min-width: 0;
}

.file-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
}

.file-details {
    flex: 1 1 auto;
    min-width: 0;
}

.file-name {
    font-weight: 500;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    word-break: break-all;
}

.file-size {
    color: var(--text-secondary);
    font-size: var(--font-size-xs);
}

.file-result-snippet {
    margin-top: var(--spacing-xs);
    font-family: 'SFMono-Regular', Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    word-break: break-all;
    overflow-wrap: anywhere;
    max-height: 3.2em;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.file-actions {
    display: flex;
    gap: var(--spacing-xs);
    flex: 1 1 160px;
    justify-content: flex-start;
    flex-wrap: wrap;
}

@media (min-width: 768px) {
    .file-actions {
        flex: 0 0 auto;
        align-self: center;
        justify-content: flex-end;
    }
}

/* Progress bars */
.progress-container {
    margin: var(--spacing-lg) 0;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 4px;
    transition: width var(--transition-normal);
    width: 0%;
}

.progress-text {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* Result containers */
.result-container {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-md);
    background: var(--background-color);
    border-radius: var(--border-radius);
    border: var(--border-width) solid var(--border-color);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.result-textarea {
    width: 100%;
    min-height: 120px;
    padding: var(--spacing-sm);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--border-radius);
    font-family: monospace;
    font-size: var(--font-size-xs);
    resize: vertical;
    background: white;
}

/* Upload options */
.upload-options {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-md);
    background: var(--background-color);
    border-radius: var(--border-radius);
}

.option-group {
    margin-bottom: var(--spacing-md);
}

.option-group:last-child {
    margin-bottom: 0;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-size: var(--font-size-sm);
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    position: relative;
    transition: all var(--transition-fast);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    content: "✓";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 12px;
    font-weight: bold;
}

.option-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    font-weight: 500;
}

.option-group input[type="number"] {
    width: 100%;
    padding: var(--spacing-sm);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
}

/* Upload list */
.upload-list {
    margin: var(--spacing-lg) 0;
}

.upload-item {
    padding: var(--spacing-md);
    background: var(--background-color);
    border-radius: var(--border-radius);
    border: var(--border-width) solid var(--border-color);
    margin-bottom: var(--spacing-sm);
}

.upload-item:last-child {
    margin-bottom: 0;
}

.upload-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.upload-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.upload-name {
    font-weight: 500;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    flex: 1 1 220px;
    min-width: 0;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--spacing-xs);
    word-break: break-all;
}

.upload-status {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 12px;
    font-size: var(--font-size-xs);
    font-weight: 500;
    text-transform: uppercase;
    margin-left: auto;
    white-space: nowrap;
}

.upload-status.pending {
    background: #fff3cd;
    color: #856404;
}

.upload-status.uploading {
    background: #d1ecf1;
    color: #0c5460;
}

.upload-status.completed {
    background: #d4edda;
    color: #155724;
}

.upload-status.failed {
    background: #f8d7da;
    color: #721c24;
}

.upload-url {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.upload-url input {
    flex: 1 1 200px;
    min-width: 0;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: var(--font-size-xs);
    background: white;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    min-height: 36px;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--secondary-color);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-secondary);
    border: var(--border-width) solid var(--border-color);
}

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

.btn-copy {
    background-color: var(--accent-color);
    color: white;
    font-size: var(--font-size-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    min-height: 28px;
}

.btn-copy:hover {
    background-color: #1991db;
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
    min-height: 28px;
}

/* Module actions */
.module-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

/* S3 status */
.s3-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--background-color);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-sm);
}

.status-indicator {
    font-size: var(--font-size-md);
}

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

/* Footer */
.footer {
    padding: var(--spacing-lg) 0;
    border-top: var(--border-width) solid var(--border-color);
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-text {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

.footer-link {
    color: var(--primary-color);
    text-decoration: none;
}

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

.footer-version {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    opacity: 0.7;
}

/* Global status bar */
.status-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--card-background);
    border-top: var(--border-width) solid var(--border-color);
    padding: var(--spacing-sm) var(--spacing-md);
    z-index: 1000;
    transform: translateY(100%);
    transition: transform var(--transition-normal);
}

.status-bar.visible {
    transform: translateY(0);
}

.status-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    max-width: 1200px;
    margin: 0 auto;
}

.status-icon {
    font-size: var(--font-size-md);
}

.status-message {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* Loading overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    transition: opacity var(--transition-normal);
}

.loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-spinner {
    text-align: center;
    color: white;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-text {
    font-size: var(--font-size-sm);
    color: white;
}

/* Toast notifications */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 3000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-width: 400px;
}

.toast {
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    background: white;
    border: var(--border-width) solid var(--border-color);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    animation: slideIn 0.3s ease;
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--error-color);
}

.toast.warning {
    border-left: 4px solid var(--warning-color);
}

.toast-icon {
    font-size: var(--font-size-lg);
    margin-top: 2px;
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.toast-message {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    line-height: 1.4;
}

.toast-close {
    background: none;
    border: none;
    font-size: var(--font-size-lg);
    cursor: pointer;
    opacity: 0.7;
    margin-top: -2px;
}

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

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

/* Utility classes */
.hidden {
    display: none !important;
}

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

.text-success {
    color: var(--success-color);
}

.text-error {
    color: var(--error-color);
}

.text-warning {
    color: var(--warning-color);
}

/* Mobile responsiveness */
@media (max-width: 767px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .converters-grid {
        gap: var(--spacing-lg);
    }

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

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

    .upload-zone {
        padding: var(--spacing-lg);
        min-height: 100px;
    }

    .footer-content {
        gap: var(--spacing-sm);
    }

    .toast-container {
        top: 10px;
        right: 10px;
        left: 10px;
        max-width: none;
    }

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

    .btn {
        width: 100%;
        justify-content: center;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}