/* ===================================
   Component Styles
   =================================== */

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.75rem 1.5rem;
    font-size: var(--font-size-base);
    font-weight: 600;
    line-height: 1;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--primary-foreground);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--gradient-secondary);
    color: var(--secondary-foreground);
    box-shadow: var(--shadow-md);
}

.btn-secondary:hover:not(:disabled) {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--foreground);
    border: 2px solid var(--border);
}

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

.btn-ghost {
    background: transparent;
    color: var(--foreground);
}

.btn-ghost:hover:not(:disabled) {
    background: var(--accent);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: var(--font-size-lg);
}

/* Cards */
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-slow);
}

.glass-card {
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.8) 0%,
            rgba(255, 255, 255, 0.6) 100%);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius);
    box-shadow: var(--shadow-card);
}

.dark .glass-card {
    background: linear-gradient(135deg,
            rgba(30, 30, 40, 0.8) 0%,
            rgba(20, 20, 30, 0.6) 100%);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.category-card {
    padding: var(--spacing-xl);
    background: var(--card);
    border-radius: 1rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-slow);
    cursor: pointer;
}

.category-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--primary);
}

.category-card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    margin-bottom: var(--spacing-md);
    font-size: 24px;
    transition: all var(--transition-base);
}

.category-card:hover .category-card-icon {
    transform: scale(1.1);
}

.category-card-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--foreground);
}

.category-card-description {
    font-size: var(--font-size-sm);
    color: var(--muted-foreground);
    line-height: 1.5;
}

/* Hover Lift Effect */
.hover-lift {
    transition: all var(--transition-slow);
}

.hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* Input Fields */
.input {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: var(--font-size-base);
    font-family: var(--font-sans);
    background: var(--background);
    color: var(--foreground);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    outline: none;
    transition: all var(--transition-base);
}

.input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.input::placeholder {
    color: var(--muted-foreground);
}

.converter-input {
    width: 100%;
    padding: 1rem 1.25rem;
    font-size: var(--font-size-xl);
    font-weight: 500;
    background: var(--background);
    color: var(--foreground);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    outline: none;
    transition: all var(--transition-base);
}

.converter-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.2);
}

/* Select Dropdown */
.select {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: var(--font-size-base);
    font-family: var(--font-sans);
    background: var(--background);
    color: var(--foreground);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    outline: none;
    cursor: pointer;
    transition: all var(--transition-base);
}

.select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

/* Badge */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: 9999px;
    background: var(--accent);
    color: var(--accent-foreground);
}

.badge-primary {
    background: var(--primary);
    color: var(--primary-foreground);
}

.badge-secondary {
    background: var(--secondary);
    color: var(--secondary-foreground);
}

/* Accordion */
.accordion {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.accordion-item {
    border-bottom: 1px solid var(--border);
}

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

.accordion-trigger {
    width: 100%;
    padding: var(--spacing-lg);
    background: var(--card);
    border: none;
    text-align: left;
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--foreground);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background var(--transition-base);
}

.accordion-trigger:hover {
    background: var(--accent);
}

.accordion-trigger-icon {
    transition: transform var(--transition-base);
}

.accordion-trigger.active .accordion-trigger-icon {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.accordion-content.active {
    max-height: 1000px;
}

.accordion-content-inner {
    padding: var(--spacing-lg);
    color: var(--muted-foreground);
    line-height: 1.6;
}

/* Navigation */
.nav-link {
    position: relative;
    padding: 0.5rem 1rem;
    color: var(--foreground);
    font-weight: 500;
    text-decoration: none;
    transition: color var(--transition-base);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 1rem;
    right: 1rem;
    height: 2px;
    background: var(--primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
}

.nav-link:hover::after,
.nav-link.active::after {
    transform: scaleX(1);
}

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 50;
    width: 100%;
    background: rgba(255, 255, 255, 0.8);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem var(--spacing-md);
    max-width: 1536px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: var(--shadow-md);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--foreground);
}

.logo-text .gradient-text {
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.footer-heading {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--foreground);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    list-style: none;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--foreground);
    cursor: pointer;
}

/* Footer */
.footer {
    background: var(--card);
    border-top: 1px solid var(--border);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    margin-top: var(--spacing-3xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h3 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links a {
    color: var(--muted-foreground);
    text-decoration: none;
    transition: color var(--transition-base);
}

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

.footer-bottom {
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--muted-foreground);
    font-size: var(--font-size-sm);
}

/* Converter Widget */
.converter-widget {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-card);
}

.converter-row {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--spacing-lg);
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

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

.swap-button {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent);
    border: 2px solid var(--border);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: 20px;
}

.swap-button:hover {
    background: var(--primary);
    color: var(--primary-foreground);
    transform: rotate(180deg);
}

/* Popular Conversion Card */
.popular-conversion-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-slow);
}

.popular-conversion-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.popular-conversion-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--foreground);
    margin-bottom: var(--spacing-xs);
}

.popular-conversion-subtitle {
    font-size: var(--font-size-sm);
    color: var(--muted-foreground);
}

/* Feature Card */
.feature-card {
    text-align: center;
    padding: var(--spacing-xl);
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent);
    border-radius: 16px;
    font-size: 32px;
    color: var(--primary);
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.feature-description {
    color: var(--muted-foreground);
    line-height: 1.6;
}

/* Responsive - Mobile */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 65px;
        left: 0;
        right: 0;
        background: var(--card);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        padding: var(--spacing-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-slow);
    }

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

    .mobile-menu-toggle {
        display: block;
    }

    .converter-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .swap-button {
        transform: rotate(90deg);
        margin: 0 auto;
    }

    .swap-button:hover {
        transform: rotate(270deg);
    }
}