/* ========================================
   Universal File Converter - Styles
   Cosas Learning
   ======================================== */

/* CSS Variables for Theming */
:root {
    /* Light Mode Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --card-bg: #ffffff;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    
    /* Brand Colors */
    --primary: #7c3aed;
    --primary-light: #8b5cf6;
    --primary-dark: #6d28d9;
    --success: #10b981;
    --success-light: #34d399;
    --danger: #ef4444;
    --warning: #f59e0b;
    
    /* Header/Footer */
    --header-bg: #ffffff;
    --footer-bg: #f8fafc;
    
    /* Upload Zone */
    --upload-border: #cbd5e1;
    --upload-bg: #f8fafc;
    --upload-hover-bg: #eff6ff;
    --upload-hover-border: #7c3aed;
    
    /* Hero Gradient */
    --hero-start: #7c3aed;
    --hero-end: #a855f7;
}

/* Dark Mode Colors */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    --border-color: #334155;
    --card-bg: #1e293b;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    
    --header-bg: #1e293b;
    --footer-bg: #0f172a;
    
    --upload-border: #475569;
    --upload-bg: #1e293b;
    --upload-hover-bg: #312e81;
    --upload-hover-border: #8b5cf6;
    
    --hero-start: #5b21b6;
    --hero-end: #7e22ce;
}

/* Base Styles */
* {
    box-sizing: border-box;
}

body {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Header Styles */
.header-bg {
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
}

.nav-link {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

.nav-link:hover {
    color: var(--primary);
    background-color: var(--bg-tertiary);
}

.nav-active {
    color: var(--primary) !important;
    background-color: rgba(124, 58, 237, 0.1) !important;
    font-weight: 600;
}

.mobile-nav-link {
    color: var(--text-secondary);
    font-size: 1rem;
    background-color: var(--bg-tertiary);
}

.mobile-nav-link:hover {
    color: var(--primary);
    background-color: var(--bg-secondary);
}

.mobile-nav-active {
    color: var(--primary) !important;
    background-color: rgba(124, 58, 237, 0.15) !important;
    font-weight: 600;
}

/* Theme Toggle */
.theme-toggle {
    color: var(--text-secondary);
    background-color: var(--bg-tertiary);
}

.theme-toggle:hover {
    color: var(--primary);
    background-color: var(--bg-secondary);
}

[data-theme="dark"] .sun-icon {
    display: block;
}

[data-theme="dark"] .moon-icon {
    display: none;
}

[data-theme="light"] .sun-icon {
    display: none;
}

[data-theme="light"] .moon-icon {
    display: block;
}

/* Mobile Menu Button */
#mobileMenuBtn {
    color: var(--text-secondary);
    background-color: var(--bg-tertiary);
}

#mobileMenuBtn:hover {
    color: var(--primary);
}

/* Hero Section */
.hero-gradient {
    background: linear-gradient(135deg, var(--hero-start) 0%, var(--hero-end) 100%);
}

/* Main Background */
.main-bg {
    background-color: var(--bg-secondary);
}

/* Card Styles */
.card-bg {
    background-color: var(--card-bg);
    box-shadow: var(--card-shadow);
}

/* Upload Zone */
.upload-zone {
    border-color: var(--upload-border);
    background-color: var(--upload-bg);
}

.upload-zone:hover,
.upload-zone.drag-over {
    border-color: var(--upload-hover-border);
    background-color: var(--upload-hover-bg);
}

.upload-icon {
    background-color: var(--bg-tertiary);
    color: var(--text-muted);
}

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

/* Buttons */
.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(124, 58, 237, 0.39);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px 0 rgba(124, 58, 237, 0.5);
}

.btn-success {
    background: linear-gradient(135deg, var(--success) 0%, var(--success-light) 100%);
    color: white;
    border: none;
    box-shadow: 0 4px 14px 0 rgba(16, 185, 129, 0.39);
}

.btn-success:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px 0 rgba(16, 185, 129, 0.5);
    border: none;
}

.btn-success:focus {
    outline: none;
    border: none;
}

/* Select Input */
.select-input {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding-right: 2.5rem; /* Add margin for dropdown arrow */
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.75rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
}

[data-theme="dark"] .select-input {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%9ca3af' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
}

.select-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
}

/* Progress Bar */
.progress-bg {
    background-color: var(--bg-tertiary);
}

.progress-bar {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
}

/* Mode Tabs */
.mode-tab {
    color: var(--text-muted);
    border-color: transparent;
}

.mode-tab:hover {
    color: var(--text-secondary);
}

.mode-tab.active {
    color: var(--primary);
    border-color: var(--primary);
}

/* Conversion Item */
.conversion-item {
    background-color: var(--bg-tertiary);
}

/* Footer Styles */
.footer-bg {
    background-color: var(--footer-bg);
    border-top: 1px solid var(--border-color);
}

.footer-link {
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

.footer-link:hover {
    color: var(--primary);
}

/* Social Icons */
.social-icon {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
}

.social-icon:hover {
    background-color: var(--primary);
    color: white;
    transform: translateY(-2px);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

#mobileMenu:not(.hidden) {
    animation: fadeIn 0.2s ease-out;
}

/* Smooth transitions for all themed elements */
.header-bg,
.footer-bg,
.card-bg,
.upload-zone,
.nav-link,
.mobile-nav-link,
.btn-primary,
.btn-success,
.select-input,
.social-icon,
.footer-link,
.conversion-item {
    transition: all 0.3s ease;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Responsive Styles */
@media (max-width: 1024px) {
    .nav-link {
        font-size: 0.8rem;
        padding: 0.5rem 0.75rem;
    }
}

@media (max-width: 768px) {
    .hero-gradient h1 {
        font-size: 1.875rem;
    }
    
    .hero-gradient p {
        font-size: 1rem;
    }
}

@media (max-width: 640px) {
    .upload-zone {
        padding: 1.5rem;
    }
    
    .upload-icon {
        width: 3rem;
        height: 3rem;
    }
    
    .upload-icon svg {
        width: 1.5rem;
        height: 1.5rem;
    }
}

/* File Type Icons */
.file-type-excel { color: #10b981; }
.file-type-csv { color: #3b82f6; }
.file-type-pdf { color: #ef4444; }
.file-type-html { color: #f59e0b; }
.file-type-word { color: #2563eb; }
.file-type-image { color: #8b5cf6; }

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

.loading-spinner {
    animation: spin 1s linear infinite;
}

/* Focus States for Accessibility */
a:focus,
button:focus,
select:focus,
input:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Download Section - Force black text in light mode */
#downloadSection p {
    color: #000000 !important;
}

[data-theme="dark"] #downloadSection p {
    color: var(--text-primary) !important;
}

/* Print Styles */
@media print {
    .header-bg,
    .footer-bg,
    #uploadZone,
    #conversionSection {
        display: none !important;
    }
}