/* Unit Converter Styles - Matching Expense Split Theme */

/* ===============================================
   MODERN TOOL HEADER DESIGN
   =============================================== */
.tool-header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 3rem 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--info-color) 100%);
    border-radius: var(--radius-xl);
    color: white;
    position: relative;
    overflow: hidden;
}

.tool-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    pointer-events: none;
}

.tool-header h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    position: relative;
    z-index: 1;
}

.tool-header p {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
    position: relative;
    z-index: 1;
}

/* ===============================================
   MODERN SECTION CONTAINERS
   =============================================== */
.category-section,
.conversion-section,
.features-section {
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

.category-section::before,
.conversion-section::before,
.features-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--info-color), var(--success-color));
}

.category-section:hover,
.conversion-section:hover,
.features-section:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--border-hover);
}

.converter-main {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Category Selection */
.category-section h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2.5rem;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
}

.category-btn {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem 1rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
    overflow: hidden;
}

.category-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s;
}

.category-btn:hover::before {
    left: 100%;
}

.category-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.category-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--text-inverse);
    box-shadow: var(--shadow-lg);
}

.category-btn i {
    font-size: 1.75rem;
}

.category-btn span {
    font-size: 0.875rem;
    font-weight: 600;
}

/* Conversion Interface */
.conversion-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 2rem;
    align-items: end;
    margin-bottom: 2rem;
}

.unit-input-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.unit-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1.125rem;
}

.input-with-select {
    display: flex;
    gap: 0.5rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 0.25rem;
    transition: var(--transition);
}

.input-with-select:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.unit-input {
    flex: 1;
    border: none;
    background: transparent;
    padding: 1rem;
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--text-primary);
    border-radius: var(--radius-md);
}

.unit-input:focus {
    outline: none;
}

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

.unit-select {
    min-width: 140px;
    border: none;
    background: var(--bg-primary);
    padding: 1rem;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
}

.unit-select:focus {
    outline: none;
}

.swap-container {
    display: flex;
    align-items: center;
    justify-content: center;
}

.swap-btn {
    background: transparent;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    width: 2.5rem;
    height: 2.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 1.25rem;
    font-weight: bold;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.swap-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--bg-secondary);
    transform: scale(1.1);
}

/* ===============================================
   SEO CONTENT SECTIONS
   =============================================== */
.seo-content {
    margin-top: 3rem;
}

.seo-content section {
    background: var(--bg-card);
    padding: 3rem;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    margin-bottom: 3rem;
    position: relative;
    overflow: hidden;
}

.seo-content section:nth-child(even) {
    background: var(--bg-secondary);
}

.seo-content h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2.5rem;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.seo-content h2 i {
    color: var(--primary-color);
    font-size: 1.75rem;
}

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

.step-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    position: relative;
    transition: var(--transition);
}

.step-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--info-color));
}

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

.step-number {
    width: 3rem;
    height: 3rem;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0 auto 1.5rem;
    position: relative;
}

.step-number::before {
    content: '';
    position: absolute;
    top: -5px;
    left: -5px;
    right: -5px;
    bottom: -5px;
    background: linear-gradient(45deg, var(--primary-color), var(--info-color));
    border-radius: 50%;
    z-index: -1;
}

.step-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.step-content p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Benefits Grid */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.benefit-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
    position: relative;
}

.benefit-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--success-color));
}

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

.benefit-icon {
    width: 4rem;
    height: 4rem;
    background: linear-gradient(135deg, var(--primary-color), var(--info-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 1.75rem;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25);
    transition: var(--transition);
}

.benefit-card:hover .benefit-icon {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.35);
}

.benefit-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.benefit-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Features Container */
.features-container {
    margin-top: 2rem;
}

.features-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
}

.feature-item {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.feature-item i {
    width: 3rem;
    height: 3rem;
    background: linear-gradient(135deg, var(--primary-color), var(--info-color));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.feature-item h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.feature-item p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.5;
}

/* Use Cases Grid */
.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.use-case-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
    position: relative;
}

.use-case-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--info-color), var(--success-color));
}

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

.use-case-icon {
    width: 4rem;
    height: 4rem;
    background: linear-gradient(135deg, var(--info-color), var(--success-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 1.75rem;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.25);
    transition: var(--transition);
}

.use-case-card:hover .use-case-icon {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.35);
}

.use-case-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.use-case-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Tips Container */
.tips-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.tip-item {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    transition: var(--transition);
}

.tip-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--success-color);
}

.tip-icon {
    width: 3rem;
    height: 3rem;
    background: linear-gradient(135deg, var(--success-color), var(--info-color));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    flex-shrink: 0;
    box-shadow: 0 3px 10px rgba(16, 185, 129, 0.25);
    transition: var(--transition);
}

.tip-item:hover .tip-icon {
    transform: scale(1.1);
    box-shadow: 0 5px 15px rgba(16, 185, 129, 0.35);
}

.tip-content h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.tip-content p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* FAQ Container */
.faq-container {
    max-width: 800px;
    margin: 2rem auto 0;
}

.faq-item {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: 1rem;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--primary-color);
}

.faq-question {
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
    background: var(--bg-primary);
}

.faq-question:hover {
    background: var(--bg-secondary);
}

.faq-question h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    flex: 1;
}

.faq-question i {
    color: var(--primary-color);
    transition: transform 0.3s ease;
    font-size: 1.25rem;
    margin-left: 1rem;
    opacity: 0.8;
}

.faq-question:hover i {
    opacity: 1;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 1.5rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 200px;
    padding: 0 1.5rem 1.5rem;
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.conversion-section,
.features-section,
.seo-content section {
    animation: fadeInUp 0.6s ease-out;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .steps-grid,
    .benefits-grid,
    .use-cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .features-list,
    .tips-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .tool-header {
        padding: 2rem 1rem;
        margin-bottom: 2rem;
    }

    .tool-header h1 {
        font-size: 2.5rem;
        flex-direction: column;
        gap: 0.75rem;
    }

    .tool-header p {
        font-size: 1rem;
        padding: 0 1rem;
    }

    .category-section,
    .conversion-section,
    .features-section,
    .seo-content section {
        padding: 2rem;
    }

    .seo-content h2 {
        font-size: 1.75rem;
        flex-direction: column;
        gap: 0.5rem;
    }

    .category-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }

    .category-btn {
        padding: 1rem 0.5rem;
    }

    .category-btn i {
        font-size: 1.5rem;
    }

    .conversion-container {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .swap-container {
        order: 3;
    }

    .swap-btn {
        transform: rotate(90deg);
    }

    .swap-btn:hover {
        transform: rotate(270deg) scale(1.1);
    }

    .input-with-select {
        flex-direction: column;
        gap: 0;
    }

    .unit-select {
        min-width: unset;
        border-top: 1px solid var(--border-color);
    }

    .steps-grid,
    .benefits-grid,
    .use-cases-grid {
        grid-template-columns: 1fr;
    }

    .feature-item,
    .tip-item {
        flex-direction: column;
        text-align: center;
    }

    .feature-item i,
    .tip-icon {
        margin: 0 auto 1rem;
    }

    .faq-question {
        padding: 1rem;
    }

    .faq-answer {
        padding: 0 1rem;
    }

    .faq-item.active .faq-answer {
        padding: 0 1rem 1rem;
    }
}

@media (max-width: 480px) {
    .tool-header {
        padding: 1.5rem 1rem;
        margin-bottom: 1.5rem;
    }

    .tool-header h1 {
        font-size: 2rem;
    }

    .seo-content h2 {
        font-size: 1.5rem;
    }

    .category-section,
    .conversion-section,
    .features-section,
    .seo-content section {
        padding: 1.5rem;
    }

    .category-grid {
        grid-template-columns: 1fr;
    }

    .category-btn {
        padding: 1.25rem 1rem;
    }

    .step-card,
    .benefit-card,
    .use-case-card {
        padding: 1.5rem;
    }

    .step-number,
    .benefit-icon,
    .use-case-icon {
        width: 3rem;
        height: 3rem;
        font-size: 1.25rem;
    }

    .feature-item i,
    .tip-icon {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1rem;
    }
}