/* =====================
   Calculator Styles
   ===================== */

/* Home Page */
.home-page .hero {
    text-align: center;
    padding: 3rem 0;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

/* Calculator Grid */
.calculators-grid {
    padding: 2rem 0;
}

.calculators-grid h2 {
    margin-bottom: 1.5rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.calculator-card {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    transition: all 0.2s;
    color: var(--text-primary);
}

.calculator-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}

.card-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.calculator-card h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.calculator-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Features Grid */
.features {
    padding: 3rem 0;
}

.features h2 {
    text-align: center;
    margin-bottom: 2rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 2rem;
}

.feature {
    text-align: center;
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

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

/* Calculator Page */
.calculator-page {
    max-width: 800px;
    margin: 0 auto;
}

.calculator-page h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.calculator-description {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Calculator Form */
.calculator-form-container {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    margin-bottom: 2rem;
}

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

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

.calculator-form input,
.calculator-form select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: border-color 0.2s;
}

.calculator-form input:focus,
.calculator-form select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-hint {
    display: block;
    font-size: 0.75rem;
    color: var(--text-light);
    margin-top: 0.25rem;
}

.form-section {
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
    margin-top: 1.5rem;
}

.form-section h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

/* Result Page */
.result-page {
    max-width: 800px;
    margin: 0 auto;
}

.result-page h1 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
}

.result-box {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    text-align: center;
    margin-bottom: 2rem;
}

.result-label {
    font-size: 0.875rem;
    opacity: 0.9;
    margin-bottom: 0.5rem;
}

.result-value {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.result-formula {
    font-size: 1.125rem;
    opacity: 0.9;
    margin-bottom: 1rem;
}

.result-text {
    font-family: var(--font-mono);
    font-size: 1rem;
    background: var(--bg-light);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    display: inline-block;
    margin-top: 0.5rem;
}

.result-box .btn-copy {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    margin-top: 1rem;
}

.result-box .btn-copy:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Solution Steps */
.solution-section,
.rules-section,
.formula-section,
.related-section,
.new-calculation,
.calculator-info {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.solution-section h2,
.rules-section h2,
.formula-section h2,
.related-section h2,
.new-calculation h2,
.calculator-info h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.steps-list {
    list-style: none;
    counter-reset: step-counter;
}

.steps-list .step {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.steps-list .step:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.step-number {
    width: 32px;
    height: 32px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
}

.step-description {
    margin-bottom: 0.5rem;
}

.step-formula {
    font-family: var(--font-mono);
    background: var(--bg-light);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
}

/* Formula Box */
.formula-box {
    background: var(--bg-light);
    padding: 1rem;
    border-radius: var(--border-radius);
    font-family: var(--font-mono);
}

/* Rules List */
.rules-list {
    list-style: disc;
    padding-left: 1.5rem;
}

.rules-list li {
    margin-bottom: 0.5rem;
}

/* Rules Grid */
.rules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.rule-card {
    background: var(--bg-light);
    border-radius: var(--border-radius);
    padding: 1rem;
}

.rule-card h4 {
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.rule-formula {
    font-size: 0.9rem;
}

/* Related Calculations */
.related-table-wrapper {
    overflow-x: auto;
}

.related-table {
    width: 100%;
    border-collapse: collapse;
}

.related-table th,
.related-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.related-table th {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.related-table a {
    font-weight: 500;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
}

.related-card {
    background: var(--bg-light);
    border-radius: var(--border-radius);
    padding: 1rem;
    text-align: center;
    transition: all 0.2s;
    color: var(--text-primary);
}

.related-card:hover {
    background: var(--bg-color);
    transform: translateY(-2px);
}

.related-function,
.related-result {
    font-size: 0.9rem;
}

.related-arrow {
    color: var(--text-light);
    margin: 0.25rem 0;
}

/* Inline Form */
.inline-form {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.inline-form input,
.inline-form select {
    flex: 1;
    min-width: 120px;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
}

/* Examples Section */
.examples-section,
.popular-calculations {
    margin-top: 2rem;
}

.examples-section h2,
.popular-calculations h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.examples-grid,
.popular-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.example-item,
.popular-item {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    color: var(--text-primary);
    transition: all 0.2s;
}

.example-item:hover,
.popular-item:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.popular-item {
    display: flex;
    gap: 0.5rem;
}

.calc-result {
    color: var(--primary-color);
    font-weight: 500;
}

/* Math Display */
.math-display {
    font-size: 1.25rem;
    padding: 1rem;
    text-align: center;
}

/* Error Page */
.error-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 50vh;
    text-align: center;
}

.error-code {
    font-size: 6rem;
    font-weight: 700;
    color: var(--text-light);
    line-height: 1;
}

.error-content h1 {
    margin: 1rem 0;
}

.error-message {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Coming Soon */
.coming-soon {
    text-align: center;
    padding: 4rem 0;
}

.coming-soon-message {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

/* Formulas List */
.formulas-list,
.derivatives-list,
.integrals-list {
    list-style: none;
    padding: 0;
}

.formulas-list li,
.derivatives-list li,
.integrals-list li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.formulas-list li:last-child,
.derivatives-list li:last-child,
.integrals-list li:last-child {
    border-bottom: none;
}

/* Responsive */
@media (max-width: 640px) {
    .form-row {
        grid-template-columns: 1fr;
    }

    .result-value {
        font-size: 2rem;
    }

    .inline-form {
        flex-direction: column;
    }

    .inline-form input,
    .inline-form select,
    .inline-form button {
        width: 100%;
    }

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