/* ============================================
   Linear Thermal Expansion Calculator
   ============================================ */

.calculator-layout {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 24px;
}

.calc-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
    height: fit-content;
}

/* Input Sections */
.section-title {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.input-group {
    margin-bottom: 24px;
}

.input-row {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 12px;
    align-items: end;
}

.input-wrapper label {
    display: block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.input-wrapper input, .input-wrapper select {
    width: 100%;
    font-family: 'JetBrains Mono', monospace;
    padding: 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 1rem;
}

.input-wrapper input:focus, .input-wrapper select:focus {
    border-color: var(--accent-engineering);
    outline: none;
}

/* Material Selection */
.material-select-group {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 12px;
}

/* CTE Range Info Indicator */
.cte-range-info {
    font-size: 0.75rem;
    color: var(--accent-warning);
    font-family: 'JetBrains Mono', monospace;
    margin-top: 4px;
    padding: 4px 8px;
    background: var(--bg-card);
    border-radius: 4px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.cte-range-info::before {
    content: 'ℹ️';
    font-size: 0.875rem;
}

/* Results Panel */
.results-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 24px;
    margin-top: 32px;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px dashed var(--border-color);
}

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

.result-label {
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.result-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-engineering);
}

.result-value.percent {
    color: var(--text-primary);
}

.result-sub {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-left: 8px;
}

/* Visualization Bar */
.expansion-viz {
    margin-top: 24px;
    padding: 40px 20px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    position: relative;
}

.viz-track {
    height: 44px;
    background: transparent;
    position: relative;
    overflow: visible;
    display: flex;
    align-items: center;
}

.viz-bar {
    height: 100%;
    background: var(--text-secondary); /* Grey base */
    width: 80%; /* Base width */
    border-radius: 4px 0 0 4px;
    transition: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--bg-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    font-weight: 600;
}

.viz-bar-text {
    z-index: 2;
    pointer-events: none;
}

.viz-expansion {
    height: 100%;
    background: var(--accent-engineering);
    position: absolute;
    top: 0;
    width: 0;
    border-radius: 0 4px 4px 0;
    transition: all 0.5s ease;
    opacity: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.viz-expansion span {
    color: var(--bg-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    font-weight: 700;
    white-space: nowrap;
    padding: 0 4px;
}

.viz-label, .viz-label-base, .viz-label-start, .viz-label-end, .viz-label-delta {
    position: absolute;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
}

.viz-label-start { top: -28px; left: 0; color: var(--text-secondary); }
.viz-label-end { top: -28px; right: 20%; color: var(--text-secondary); }
.viz-label-delta { top: 100%; margin-top: 8px; left: 80%; transform: translateX(-50%); color: var(--accent-engineering); white-space: nowrap; }

.viz-caption {
    margin-top: 32px;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
}

/* Sidebar */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 24px;
    height: fit-content;
}

.sidebar-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    flex-direction: column;
}

.sidebar-card.table-card {
    height: calc(100vh - 420px);
    min-height: 350px;
}

.table-wrapper {
    overflow-y: auto;
    margin-top: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    flex-grow: 1;
}

.cte-table {
    width: 100%;
    border-collapse: collapse;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
}

.cte-table thead {
    position: sticky;
    top: 0;
    background: var(--bg-card);
    z-index: 2;
}

.cte-table th {
    text-align: left;
    color: var(--text-muted);
    padding: 10px 8px;
    border-bottom: 2px solid var(--border-color);
    font-weight: 600;
}

.cte-table td {
    padding: 8px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-right: 1px solid var(--border-color);
}

.cte-table td:last-child { border-right: none; }

.cte-table tr:hover td {
    color: var(--text-primary);
    background: var(--bg-secondary);
    cursor: pointer;
}

/* Disclaimer Card */
.disclaimer-card {
    border: 1px solid #f59e0b;
    background: rgba(245, 158, 11, 0.05);
    border-radius: 8px;
    overflow: hidden;
}

.disclaimer-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    cursor: pointer;
    user-select: none;
    background: rgba(245, 158, 11, 0.1);
    border-bottom: 1px solid rgba(217, 119, 6, 0.2);
    transition: background 0.2s ease;
}

.disclaimer-header:hover {
    background: rgba(245, 158, 11, 0.15);
}

.disclaimer-header span {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.875rem;
    font-weight: 600;
    color: #d97706;
    text-transform: uppercase;
    flex-grow: 1;
}

.disclaimer-header svg:first-child {
    color: #d97706;
    flex-shrink: 0;
}

.disclaimer-header .chevron {
    transition: transform 0.3s ease;
    color: #d97706;
    flex-shrink: 0;
}

.disclaimer-header .chevron.collapsed {
    transform: rotate(-90deg);
}

.disclaimer-content {
    padding: 16px;
    max-height: 500px;
    overflow-y: auto;
    transition: max-height 0.3s ease, opacity 0.3s ease;
    font-size: 0.75rem;
    line-height: 1.5;
    color: var(--text-secondary);
}

.disclaimer-content.collapsed {
    max-height: 0;
    padding: 0 16px;
    overflow: hidden;
    opacity: 0;
}

.disclaimer-section {
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(217, 119, 6, 0.15);
}

.disclaimer-section:last-of-type {
    border-bottom: none;
}

.disclaimer-section h4 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.8125rem;
    font-weight: 600;
    color: #d97706;
    margin: 0 0 8px 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.disclaimer-section p {
    margin: 6px 0;
    font-family: sans-serif;
}

.disclaimer-section .formula {
    font-family: 'JetBrains Mono', monospace;
    background: rgba(245, 158, 11, 0.1);
    padding: 8px 12px;
    border-radius: 6px;
    text-align: center;
    font-size: 0.8125rem;
    color: var(--text-primary);
    margin: 8px 0;
}

.disclaimer-note {
    font-style: italic;
    color: var(--text-muted);
}

.disclaimer-list {
    margin: 8px 0;
    padding-left: 16px;
}

.disclaimer-list li {
    margin-bottom: 8px;
    line-height: 1.4;
}

.disclaimer-list strong {
    color: var(--text-primary);
    font-weight: 600;
}

.disclaimer-nested {
    margin: 6px 0 6px 16px;
    padding-left: 12px;
    border-left: 2px solid rgba(217, 119, 6, 0.3);
}

.disclaimer-nested li {
    margin-bottom: 4px;
    font-size: 0.6875rem;
    color: var(--text-muted);
}

.disclaimer-footer {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid rgba(217, 119, 6, 0.3);
}

.disclaimer-footer p {
    margin: 6px 0;
    font-size: 0.6875rem;
    line-height: 1.4;
}

.disclaimer-footer strong {
    color: #d97706;
}

/* Explanation Section */
.explanation-section {
    margin-top: 48px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 40px;
}

.explanation-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}

.exp-col h3 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.exp-col p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
}

/* Atomic Animation */
.atomic-demo {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 24px;
}

.atomic-state {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.temp-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    font-weight: 700;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 6px;
    text-transform: uppercase;
}

.temp-label.cold { color: #3b82f6; }
.temp-label.hot { color: #ef4444; }

.lattice {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    transition: all 0.5s ease;
}

.lattice.cold { gap: 4px; }
.lattice.hot { gap: 10px; }

.atom {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    position: relative;
}

.lattice.cold .atom {
    background-color: #60a5fa;
    animation: shiver 0.1s infinite alternate;
}

.lattice.hot .atom {
    background-color: #f87171;
    box-shadow: 0 0 6px rgba(248, 113, 113, 0.6);
    animation: vibrate-hard 0.15s infinite linear;
}

@keyframes shiver {
    0% { transform: translate(0, 0); }
    100% { transform: translate(0.5px, 0.5px); }
}

@keyframes vibrate-hard {
    0% { transform: translate(0, 0); }
    25% { transform: translate(2px, 2px); }
    50% { transform: translate(-1px, -2px); }
    75% { transform: translate(-2px, 1px); }
    100% { transform: translate(0, 0); }
}

.highlight-box {
    background: var(--bg-secondary);
    border-left: 4px solid var(--accent-engineering);
    padding: 16px;
    border-radius: 0 8px 8px 0;
    margin: 20px 0;
}

.highlight-box code {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    color: var(--accent-engineering);
    font-size: 1.1em;
}

/* References Section */
.references-section {
    margin-top: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
}

.references-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    cursor: pointer;
    user-select: none;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    transition: background 0.2s ease;
}

.references-header:hover {
    background: var(--bg-card);
}

.references-header span {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    flex-grow: 1;
}

.references-header .chevron {
    transition: transform 0.3s ease;
    color: var(--text-secondary);
}

.references-header .chevron.collapsed {
    transform: rotate(-90deg);
}

.references-content {
    padding: 20px;
    max-height: 600px;
    overflow-y: auto;
    transition: max-height 0.3s ease, opacity 0.3s ease;
}

.references-content.collapsed {
    max-height: 0;
    padding: 0 20px;
    overflow: hidden;
    opacity: 0;
}

.references-intro {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 20px;
}

.ref-category {
    margin-bottom: 24px;
}

.ref-category h4 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.9375rem;
    color: var(--text-primary);
    margin-bottom: 12px;
    font-weight: 600;
}

.ref-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.ref-list li {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 8px;
    padding-left: 16px;
    position: relative;
}

.ref-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-engineering);
}

.ref-list a {
    color: var(--accent-engineering);
    text-decoration: none;
}

.ref-list a:hover {
    text-decoration: underline;
}

.ref-table {
    width: 100%;
    border-collapse: collapse;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    margin-bottom: 16px;
}

.ref-table th {
    text-align: left;
    color: var(--text-muted);
    padding: 10px 12px;
    border-bottom: 2px solid var(--border-color);
    font-weight: 600;
}

.ref-table td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.ref-table tr:hover td {
    background: var(--bg-secondary);
}

.ref-table a {
    color: var(--accent-engineering);
    text-decoration: none;
}

.ref-table a:hover {
    text-decoration: underline;
}

.references-footer {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
}

/* Responsive */
@media (max-width: 900px) {
    .calculator-layout { grid-template-columns: 1fr; }
    .sidebar-card.table-card { height: 400px; }
    .explanation-grid { grid-template-columns: 1fr; }
    .references-content { max-height: 400px; }
}

@media (max-width: 600px) {
    .ref-table {
        font-size: 0.6875rem;
    }

    .ref-table th,
    .ref-table td {
        padding: 6px 8px;
    }

    .references-header {
        padding: 12px 16px;
    }

    .disclaimer-header {
        padding: 10px 12px;
    }

    .disclaimer-header span {
        font-size: 0.75rem;
    }

    .disclaimer-content {
        padding: 12px;
    }

    .disclaimer-section h4 {
        font-size: 0.75rem;
    }

    .disclaimer-section .formula {
        font-size: 0.75rem;
        padding: 6px 10px;
    }
}