/* Diamond Problem Solver - Custom Styles */

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --teal-color: #14b8a6;
    --teal-dark: #0d9488;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.dark {
    --text-dark: #f9fafb;
    --text-light: #d1d5db;
    --bg-light: #111827;
    --bg-white: #1f2937;
    --border-color: #374151;
}

* {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

/* Diamond Calculator Layout */
.diamond-container {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 200px 1fr;
    grid-template-rows: auto auto auto;
    gap: 1.5rem;
    align-items: center;
    justify-items: center;
    max-width: 600px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.diamond-input-wrapper {
    width: 100%;
    max-width: 200px;
}

.diamond-input-wrapper.top {
    grid-column: 2;
    grid-row: 1;
}

.diamond-input-wrapper.left {
    grid-column: 1;
    grid-row: 2;
}

.diamond-icon {
    grid-column: 2;
    grid-row: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 120px;
    height: 120px;
    position: relative;
}

.diamond-input-wrapper.right {
    grid-column: 3;
    grid-row: 2;
}

.diamond-input-wrapper.bottom {
    grid-column: 2;
    grid-row: 3;
}

.diamond-label {
    display: block;
    text-align: center;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-light);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.diamond-input {
    width: 100%;
    font-size: 1.25rem;
    font-weight: 600;
    text-align: center;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    border: 2px solid var(--border-color);
    background: var(--bg-white);
    color: var(--text-dark);
    transition: all 0.2s;
}

.diamond-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.diamond-input.solved {
    background-color: #dcfce7;
    border-color: #22c55e;
    color: #166534;
}

.dark .diamond-input.solved {
    background-color: #14532d;
    border-color: #22c55e;
    color: #86efac;
}

/* Responsive Diamond Layout */
@media (max-width: 640px) {
    .diamond-container {
        grid-template-columns: 1fr 100px 1fr;
        gap: 1rem;
        padding: 1.5rem 0.5rem;
    }
    
    .diamond-input-wrapper {
        max-width: 140px;
    }
    
    .diamond-icon {
        width: 80px;
        height: 80px;
    }
    
    .diamond-icon i {
        font-size: 3rem !important;
    }
    
    .diamond-input {
        font-size: 1rem;
        padding: 0.625rem 0.75rem;
    }
}

/* Calculator Mode Selector */
.mode-selector {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 2rem;
}

.mode-btn {
    padding: 0.625rem 1.25rem;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 0.875rem;
    border: 2px solid var(--border-color);
    background: var(--bg-white);
    color: var(--text-dark);
    cursor: pointer;
    transition: all 0.2s;
}

.mode-btn:hover {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.05);
}

.mode-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Steps Display */
.steps-container {
    background: var(--bg-white);
    border-radius: 0.75rem;
    padding: 1.5rem;
    margin-top: 1.5rem;
    border: 2px solid var(--border-color);
}

.step-item {
    padding: 1rem;
    margin-bottom: 1rem;
    background: var(--bg-light);
    border-radius: 0.5rem;
    border-left: 4px solid var(--primary-color);
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.875rem;
    margin-right: 0.75rem;
}

.step-content {
    display: inline-block;
    vertical-align: middle;
    color: var(--text-dark);
}

.step-explanation {
    margin-top: 0.5rem;
    padding-left: 2.75rem;
    color: var(--text-light);
    font-size: 0.875rem;
    font-style: italic;
}

/* Solution Cards */
.solution-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 1rem;
    padding: 2rem;
    margin-top: 1.5rem;
    box-shadow: var(--shadow-lg);
}

.solution-value {
    font-size: 2rem;
    font-weight: 700;
    margin: 0.5rem 0;
}

/* Example Cards */
.example-card {
    background: var(--bg-white);
    border-radius: 0.75rem;
    padding: 1.5rem;
    border: 2px solid var(--border-color);
    cursor: pointer;
    transition: all 0.3s;
}

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

/* Code Blocks */
.code-block {
    background: #1e293b;
    color: #e2e8f0;
    border-radius: 0.5rem;
    padding: 1.5rem;
    overflow-x: auto;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    position: relative;
}

.code-block .copy-btn {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 0.375rem;
    color: white;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

.code-block .copy-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.code-block .copy-btn.copied {
    background: #22c55e;
    border-color: #22c55e;
}

/* History Items */
.history-item {
    background: var(--bg-white);
    border-radius: 0.5rem;
    padding: 1rem;
    margin-bottom: 0.75rem;
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.2s;
}

.history-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

/* Buttons */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.btn-secondary:hover {
    background: rgba(37, 99, 235, 0.1);
}

/* Tooltips */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 200px;
    background-color: #1f2937;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 8px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -100px;
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 0.875rem;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}

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

.fade-in {
    animation: fadeIn 0.3s ease-in;
}

@keyframes slideDown {
    from {
        max-height: 0;
        opacity: 0;
    }
    to {
        max-height: 1000px;
        opacity: 1;
    }
}

.slide-down {
    animation: slideDown 0.3s ease-out;
    overflow: hidden;
}

/* Loading Spinner */
.spinner {
    border: 3px solid rgba(37, 99, 235, 0.1);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 0.8s linear infinite;
    margin: 20px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Print Styles */
@media print {
    nav, footer, .no-print {
        display: none !important;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .steps-container, .solution-card {
        border: 1px solid #000;
        page-break-inside: avoid;
    }
}

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus Visible */
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* FAQ Accordion */
.faq-item {
    background: var(--bg-white);
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.faq-question {
    padding: 1.25rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: var(--text-dark);
    transition: background 0.2s;
}

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

.faq-answer {
    padding: 0 1.25rem 1.25rem 1.25rem;
    color: var(--text-light);
    line-height: 1.7;
    display: none;
}

.faq-item.active .faq-answer {
    display: block;
}

.faq-icon {
    transition: transform 0.3s;
}

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

/* Fraction Display */
.fraction {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    vertical-align: middle;
    margin: 0 0.25rem;
}

.fraction-numerator {
    border-bottom: 1px solid currentColor;
    padding-bottom: 2px;
}

.fraction-denominator {
    padding-top: 2px;
}

/* Mixed Number Display */
.mixed-number {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.mixed-whole {
    font-weight: 600;
}

/* Difficulty Badges */
.difficulty-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.difficulty-easy {
    background: #dcfce7;
    color: #166534;
}

.difficulty-medium {
    background: #fef3c7;
    color: #92400e;
}

.difficulty-hard {
    background: #fee2e2;
    color: #991b1b;
}

.dark .difficulty-easy {
    background: #14532d;
    color: #86efac;
}

.dark .difficulty-medium {
    background: #78350f;
    color: #fde047;
}

.dark .difficulty-hard {
    background: #7f1d1d;
    color: #fca5a5;
}

/* Alert Messages */
.alert {
    padding: 1rem 1.25rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.alert-info {
    background: #dbeafe;
    color: #1e40af;
    border: 1px solid #93c5fd;
}

.alert-success {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #86efac;
}

.alert-warning {
    background: #fef3c7;
    color: #92400e;
    border: 1px solid #fde047;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fca5a5;
}

.dark .alert-info {
    background: #1e3a8a;
    color: #dbeafe;
    border-color: #3b82f6;
}

.dark .alert-success {
    background: #14532d;
    color: #dcfce7;
    border-color: #22c55e;
}

.dark .alert-warning {
    background: #78350f;
    color: #fef3c7;
    border-color: #eab308;
}

.dark .alert-error {
    background: #7f1d1d;
    color: #fee2e2;
    border-color: #ef4444;
}

/* Permalink Badge */
.permalink-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-family: monospace;
    font-size: 0.875rem;
    color: var(--text-dark);
}

.permalink-badge button {
    padding: 0.25rem 0.5rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.25rem;
    cursor: pointer;
    font-size: 0.75rem;
    transition: all 0.2s;
}

.permalink-badge button:hover {
    background: var(--primary-dark);
}

/* Export Buttons */
.export-buttons {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.export-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    background: var(--bg-white);
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    color: var(--text-dark);
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
}

.export-btn:hover {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.05);
    transform: translateY(-1px);
}

.export-btn i {
    font-size: 1rem;
}

/* Random Problem Generator */
.random-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
    padding: 1rem;
    background: var(--bg-light);
    border-radius: 0.5rem;
    margin-bottom: 1.5rem;
}

.random-controls select {
    padding: 0.625rem 1rem;
    border-radius: 0.375rem;
    border: 1px solid var(--border-color);
    background: var(--bg-white);
    color: var(--text-dark);
    font-size: 0.875rem;
    cursor: pointer;
}

.random-controls button {
    flex: 1;
    min-width: 150px;
}

/* Responsive Typography */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    h3 {
        font-size: 1.5rem;
    }
    
    .solution-value {
        font-size: 1.5rem;
    }
}