/* Brand Color Palette - Option 1: Modern Professional (Blue) */
:root {
    /* Primary Colors */
    --color-primary: #2563EB;
    --color-primary-dark: #1E40AF;
    --color-primary-light: #3B82F6;
    
    /* Secondary Colors */
    --color-secondary: #1F2937;
    
    /* Accent Colors */
    --color-accent: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    
    /* Background Colors */
    --color-bg: #F9FAFB;
    --color-surface: #FFFFFF;
    
    /* Text Colors */
    --color-text-primary: #111827;
    --color-text-secondary: #6B7280;
    
    /* Border Colors */
    --color-border: #E5E7EB;
}

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

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

header {
    background: var(--color-surface);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 1rem 0;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.nav-brand {
    display: flex;
    align-items: center;
}

.logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    transition: opacity 0.2s ease;
}

.logo-link:hover {
    opacity: 0.8;
}

.logo {
    height: 40px;
    width: auto;
    display: block;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

/* Skip to content link (hidden until focused) */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: #fff;
    padding: 0.5rem 1rem;
    text-decoration: none;
    z-index: 1000;
    border-radius: 0 0 4px 0;
}

.skip-to-content:focus {
    top: 0;
}

/* Breadcrumb Navigation */
.breadcrumbs {
    margin-bottom: 1.5rem;
}

.breadcrumb-list {
    display: flex;
    list-style: none;
    padding: 0;
    margin: 0;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.breadcrumb-item:not(:last-child)::after {
    content: '/';
    margin-left: 0.5rem;
    color: var(--color-border);
}

.breadcrumb-item a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.breadcrumb-item a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

.breadcrumb-item[aria-current="page"] {
    color: var(--color-text-primary);
    font-weight: 500;
}

.language-selector {
    display: flex;
    align-items: center;
}

.language-selector select {
    padding: 0.5rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 0.9rem;
    background: var(--color-surface);
    cursor: pointer;
}

nav a {
    text-decoration: none;
    color: var(--color-text-primary);
    font-weight: 500;
    transition: color 0.2s ease;
}

nav a:hover {
    color: var(--color-primary);
}

main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.container {
    background: var(--color-surface);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

h1 {
    margin-bottom: 2rem;
    color: var(--color-text-primary);
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

input[type="file"],
input[type="number"],
input[type="text"],
select {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input[type="file"]:focus,
input[type="number"]:focus,
input[type="text"]:focus,
select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-hint {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

button, .btn {
    background: var(--color-primary);
    color: #fff;
    border: none;
    padding: 0.75rem 2rem;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    font-weight: 500;
    text-decoration: none;
    display: inline-block;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

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

button:active, .btn:active {
    transform: translateY(0);
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature {
    padding: 2rem;
    background: var(--color-surface);
    border-radius: 8px;
    text-align: center;
    border: 1px solid var(--color-border);
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.feature:hover {
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    transform: translateY(-2px);
}

.feature h2 {
    margin-bottom: 1rem;
    color: var(--color-primary);
}

.feature p {
    margin-bottom: 1.5rem;
    color: var(--color-text-secondary);
}

.status {
    margin-top: 1rem;
    padding: 1rem;
    background: #e7f3ff;
    border-radius: 4px;
}

.progress {
    margin-top: 1rem;
    height: 20px;
    background: #e0e0e0;
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--color-primary);
    width: 0%;
    animation: progress 2s infinite;
}

@keyframes progress {
    0% { width: 0%; }
    50% { width: 70%; }
    100% { width: 100%; }
}

.result {
    margin-top: 1rem;
}

/* Button container for result actions */
.result-buttons {
    display: flex;
    flex-direction: row;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.download-btn {
    display: inline-block;
    background: var(--color-accent);
    color: #fff;
    padding: 0.75rem 2rem;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 500;
    text-align: center;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

.download-btn:hover {
    background: #059669;
    transform: translateY(-1px);
}

.hidden {
    display: none;
}

footer {
    text-align: center;
    padding: 2rem;
    color: var(--color-text-secondary);
    margin-top: 4rem;
}

/* Drag & Drop Styles */
.drop-zone {
    border: 2px dashed var(--color-border);
    border-radius: 8px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--color-bg);
    margin-bottom: 1rem;
}

.drop-zone:hover:not(.file-ready) {
    border-color: var(--color-primary);
    background: rgba(37, 99, 235, 0.05);
}

.drop-zone.drag-over {
    border-color: var(--color-primary);
    background: rgba(37, 99, 235, 0.1);
    border-style: solid;
    transform: scale(1.02);
}

.drop-zone.file-ready {
    border-color: var(--color-accent);
    background: rgba(16, 185, 129, 0.05);
    border-style: solid;
}

.drop-zone.file-ready:hover {
    border-color: #059669;
    background: rgba(16, 185, 129, 0.1);
}

.drop-zone-content {
    pointer-events: none;
    position: relative;
}

.drop-icon {
    color: var(--color-text-secondary);
    margin: 0 auto 1rem;
    display: block;
    transition: color 0.3s ease, opacity 0.3s ease;
}

.drop-zone:hover .drop-icon,
.drop-zone.drag-over .drop-icon {
    color: var(--color-primary);
}

.drop-zone.file-ready .drop-icon {
    opacity: 0;
    display: none;
}

.drop-checkmark {
    display: none;
    color: var(--color-accent);
    margin: 0 auto 1rem;
    width: 64px;
    height: 64px;
    transition: all 0.3s ease;
}

.drop-zone.file-ready .drop-checkmark {
    display: block;
}

.drop-zone.file-ready .drop-text {
    color: var(--color-accent);
    font-weight: 600;
}

.drop-zone.file-ready .drop-hint {
    color: var(--color-accent);
}

.drop-text {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--color-text-primary);
    margin: 0.5rem 0;
}

.drop-hint {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin: 0;
}

/* File List */
.file-list {
    margin-top: 1rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    background: var(--color-surface);
    max-height: 200px;
    overflow-y: auto;
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--color-border);
    border-left: 3px solid transparent;
    transition: all 0.3s ease;
}

.file-item:last-child {
    border-bottom: none;
}

.file-item.file-ready {
    border-left-color: var(--color-accent);
    background: rgba(16, 185, 129, 0.05);
}

.file-checkmark {
    display: none;
    color: var(--color-accent);
    margin-right: 0.75rem;
    flex-shrink: 0;
}

.file-item.file-ready .file-checkmark {
    display: block;
}

.file-name {
    flex: 1;
    font-weight: 500;
    color: var(--color-text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-right: 1rem;
}

.file-item.file-ready .file-name {
    color: var(--color-accent);
    font-weight: 600;
}

.file-size {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    margin-right: 1rem;
}

.file-remove {
    background: var(--color-error);
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    cursor: pointer;
    font-size: 1.2rem;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    transition: background 0.2s ease;
}

.file-remove:hover {
    background: #DC2626;
}

button:disabled {
    background: var(--color-border);
    cursor: not-allowed;
    opacity: 0.6;
}

button:disabled:hover {
    background: var(--color-border);
    transform: none;
}

/* RTL Support */
[dir="rtl"] {
    direction: rtl;
    text-align: right;
}

[dir="rtl"] nav {
    flex-direction: row-reverse;
}

[dir="rtl"] .nav-links {
    flex-direction: row-reverse;
}

[dir="rtl"] .file-item {
    flex-direction: row-reverse;
}

[dir="rtl"] .file-name {
    margin-right: 0;
    margin-left: 1rem;
    text-align: right;
}

[dir="rtl"] .file-size {
    margin-right: 0;
    margin-left: 1rem;
}

[dir="rtl"] .drop-zone {
    text-align: center;
}

[dir="rtl"] .feature {
    text-align: center;
}

[dir="rtl"] input[type="file"],
[dir="rtl"] input[type="number"],
[dir="rtl"] input[type="text"],
[dir="rtl"] select {
    text-align: right;
}

[dir="rtl"] .form-hint {
    text-align: right;
}

[dir="rtl"] label {
    text-align: right;
}

/* Ensure proper alignment for mixed content */
[dir="rtl"] .container {
    text-align: right;
}

[dir="rtl"] h1,
[dir="rtl"] h2,
[dir="rtl"] h3 {
    text-align: right;
}

/* Fix flexbox direction for RTL */
[dir="rtl"] .features {
    direction: rtl;
}

/* Maintain center alignment for buttons and actions */
[dir="rtl"] button,
[dir="rtl"] .btn {
    text-align: center;
}

[dir="rtl"] footer {
    text-align: center;
}

[dir="rtl"] .result-buttons {
    direction: rtl;
}

/* Mobile Responsive Styles */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
    
    .container {
        padding: 1rem;
    }
    
    /* Stack buttons vertically on mobile */
    .result-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .result-buttons .download-btn,
    .result-buttons .btn {
        width: 100%;
        margin-left: 0 !important;
        margin-top: 0.5rem;
    }
    
    .result-buttons .download-btn:first-child,
    .result-buttons .btn:first-child {
        margin-top: 0;
    }
    
    .drop-zone {
        padding: 2rem 1rem;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    main {
        padding: 0 0.5rem;
    }
    
    .container {
        padding: 1rem 0.75rem;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    button, .btn, .download-btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
    }
}