/* ================================
   CSS Variables for Theme Colors
   ================================ */

:root {
    /* Light Theme Colors */
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --border-color: #e2e8f0;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --shadow-hover: rgba(0, 0, 0, 0.15);
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --card-bg: #ffffff;

    /* Spacing and Layout */
    --container-max-width: 1200px;
    --header-height: 70px;
    --border-radius: 12px;
    --transition-speed: 0.3s;
}

/* Dark Theme Colors */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --border-color: #334155;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --shadow-hover: rgba(0, 0, 0, 0.5);
    --accent-color: #60a5fa;
    --accent-hover: #3b82f6;
    --card-bg: #1e293b;
}

/* ================================
   Reset and Base Styles
   ================================ */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ================================
   Header Styles
   ================================ */

.header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
    box-shadow: 0 2px 4px var(--shadow-color);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--header-height);
}

.site-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 12px;
    transition: color var(--transition-speed);
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--accent-color);
}

/* Header Controls */
.header-controls {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Language Selector */
.language-selector {
    position: relative;
}

.language-toggle {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 24px;
    padding: 10px 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-speed);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.language-toggle:hover {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: white;
    transform: translateY(-2px);
}

.language-toggle svg {
    width: 20px;
    height: 20px;
    transition: color var(--transition-speed);
}

.language-toggle:hover svg {
    color: white;
}

#currentLanguage {
    min-width: 20px;
    text-align: center;
    font-weight: 700;
}

.language-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 8px;
    min-width: 160px;
    box-shadow: 0 8px 16px var(--shadow-hover);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
}

.language-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.language-option {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    background: transparent;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9375rem;
    color: var(--text-primary);
    transition: all 0.2s;
    text-align: left;
}

.language-option:hover {
    background: var(--accent-color);
    color: white;
}

.language-option .flag {
    font-size: 1.25rem;
    line-height: 1;
}

.language-option span:last-child {
    font-weight: 500;
}

/* Theme Toggle Button */
.theme-toggle {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-speed);
    position: relative;
}

.theme-toggle:hover {
    background: var(--accent-color);
    border-color: var(--accent-color);
    transform: rotate(15deg) scale(1.05);
}

.theme-toggle svg {
    width: 24px;
    height: 24px;
    color: var(--text-primary);
    transition: all var(--transition-speed);
    position: absolute;
}

.theme-toggle:hover svg {
    color: #ffffff;
}

/* Icon visibility based on theme */
.sun-icon {
    opacity: 0;
    transform: rotate(-90deg) scale(0);
}

.moon-icon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

[data-theme="dark"] .sun-icon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

[data-theme="dark"] .moon-icon {
    opacity: 0;
    transform: rotate(90deg) scale(0);
}

/* ================================
   Main Content Styles
   ================================ */

.main {
    flex: 1;
    padding: 60px 0;
}

/* Welcome Section */
.welcome-section {
    text-align: center;
    margin-bottom: 50px;
}

.welcome-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    transition: color var(--transition-speed);
}

.welcome-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    transition: color var(--transition-speed);
}

/* ================================
   Tools Grid (Flexbox Layout)
   ================================ */

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

/* Tool Card */
.tool-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 40px 30px;
    text-align: center;
    text-decoration: none;
    color: var(--text-primary);
    transition: all var(--transition-speed);
    box-shadow: 0 4px 6px var(--shadow-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.1), transparent);
    transition: left 0.5s;
}

.tool-card:hover::before {
    left: 100%;
}

.tool-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px var(--shadow-hover);
    border-color: var(--accent-color);
}

/* Tool Icon */
.tool-icon {
    width: 80px;
    height: 80px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    border-radius: 50%;
    transition: all var(--transition-speed);
}

.tool-icon svg {
    width: 40px;
    height: 40px;
    color: var(--accent-color);
    transition: all var(--transition-speed);
}

.tool-card:hover .tool-icon {
    background: var(--accent-color);
    transform: scale(1.1) rotate(5deg);
}

.tool-card:hover .tool-icon svg {
    color: #ffffff;
    transform: scale(1.15);
}

/* Tool Title */
.tool-title {
    font-size: 1.375rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
    transition: color var(--transition-speed);
}

.tool-card:hover .tool-title {
    color: var(--accent-color);
}

/* Tool Description */
.tool-description {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    transition: color var(--transition-speed);
    line-height: 1.5;
}

/* ================================
   Contact Section Styles
   ================================ */

.contact-section {
    margin-top: 60px;
    margin-bottom: 40px;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.contact-section.fade-in-contact {
    opacity: 1;
    transform: translateY(0);
}

.contact-card {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.05), rgba(139, 92, 246, 0.05));
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 40px;
    text-align: center;
    transition: all var(--transition-speed);
}

.contact-card:hover {
    border-color: var(--accent-color);
    box-shadow: 0 8px 16px var(--shadow-hover);
}

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

.contact-header svg {
    width: 28px;
    height: 28px;
    color: var(--accent-color);
}

.contact-header h3 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.contact-description {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 24px;
    line-height: 1.6;
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 14px 32px;
    background: var(--accent-color);
    color: white;
    text-decoration: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.contact-link svg:first-of-type {
    width: 24px;
    height: 24px;
}

.contact-link .arrow-icon {
    width: 20px;
    height: 20px;
    transition: transform 0.3s;
}

.contact-link:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(59, 130, 246, 0.4);
}

.contact-link:hover .arrow-icon {
    transform: translateX(4px);
}

/* ================================
   Footer Styles
   ================================ */

.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 30px 0;
    margin-top: auto;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

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

.footer-content p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin: 5px 0;
    transition: color var(--transition-speed);
}

.footer-tagline {
    font-style: italic;
    opacity: 0.8;
}

/* ================================
   Responsive Design
   ================================ */

/* Tablets (768px and below) */
@media (max-width: 768px) {
    .welcome-title {
        font-size: 2rem;
    }

    .welcome-description {
        font-size: 1rem;
    }

    .tools-grid {
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
        gap: 20px;
    }

    .tool-card {
        padding: 30px 20px;
    }

    .tool-icon {
        width: 70px;
        height: 70px;
    }

    .contact-card {
        padding: 30px 20px;
    }

    .contact-header h3 {
        font-size: 1.5rem;
    }

    .tool-icon svg {
        width: 35px;
        height: 35px;
    }

    .site-title {
        font-size: 1.5rem;
    }

    .logo-icon {
        width: 28px;
        height: 28px;
    }
}

/* Mobile Phones (480px and below) */
@media (max-width: 480px) {
    .main {
        padding: 40px 0;
    }

    .welcome-section {
        margin-bottom: 35px;
    }

    .welcome-title {
        font-size: 1.75rem;
    }

    .welcome-description {
        font-size: 0.9375rem;
    }

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

    .tool-card {
        padding: 25px 20px;
    }

    .tool-title {
        font-size: 1.25rem;
    }

    .tool-description {
        font-size: 0.875rem;
    }

    .site-title {
        font-size: 1.25rem;
    }

    .theme-toggle {
        width: 44px;
        height: 44px;
    }

    .theme-toggle svg {
        width: 22px;
        height: 22px;
    }

    .header-controls {
        gap: 8px;
    }

    .language-toggle {
        padding: 8px 12px;
        font-size: 0.8125rem;
    }

    .language-toggle svg {
        width: 18px;
        height: 18px;
    }

    .container {
        padding: 0 16px;
    }
}

/* Extra small devices (360px and below) */
@media (max-width: 360px) {
    .welcome-title {
        font-size: 1.5rem;
    }

    .site-title {
        font-size: 1.125rem;
        gap: 8px;
    }

    .logo-icon {
        width: 24px;
        height: 24px;
    }
}

/* ================================
   Animation Utilities
   ================================ */

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

.tool-card {
    animation: fadeIn 0.5s ease-out backwards;
}

.tool-card:nth-child(1) {
    animation-delay: 0.1s;
}

.tool-card:nth-child(2) {
    animation-delay: 0.2s;
}

.tool-card:nth-child(3) {
    animation-delay: 0.3s;
}

.tool-card:nth-child(4) {
    animation-delay: 0.4s;
}

/* ================================
   Accessibility
   ================================ */

/* Focus styles for keyboard navigation */
.theme-toggle:focus,
.tool-card:focus {
    outline: 3px solid var(--accent-color);
    outline-offset: 2px;
}

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