/* Lens Calculator - Component Styles (Lens Maker + Combined + Double Lens) */

:root {
    --lc-tool: #6366f1;
    --lc-tool-dark: #4f46e5;
    --lc-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --lc-light: #eef2ff;
}
[data-theme="dark"] {
    --lc-light: rgba(99, 102, 241, 0.15);
}

/* ===== Layout Override: narrow input, wide output ===== */
.lc-layout.tool-page-container {
    grid-template-columns: minmax(250px, 300px) 1fr 300px;
}
@media (max-width: 1024px) {
    .lc-layout.tool-page-container {
        grid-template-columns: minmax(240px, 290px) 1fr;
    }
}
@media (max-width: 900px) {
    .lc-layout.tool-page-container {
        grid-template-columns: 1fr;
    }
}

/* ===== Mode Toggle ===== */
.lc-mode-toggle {
    display: flex;
    border: 1.5px solid var(--border);
    border-radius: 0.5rem;
    overflow: hidden;
    margin-bottom: 0.75rem;
}
.lc-mode-btn {
    flex: 1;
    padding: 0.5rem 0.25rem;
    font-weight: 600;
    font-size: 0.65rem;
    border: none;
    cursor: pointer;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    transition: all 0.15s;
    font-family: var(--font-sans);
    text-align: center;
}
.lc-mode-btn.active {
    background: var(--lc-gradient);
    color: #fff;
}
.lc-mode-btn:hover:not(.active) {
    background: var(--bg-tertiary);
}
[data-theme="dark"] .lc-mode-btn { background: var(--bg-tertiary); }
[data-theme="dark"] .lc-mode-btn.active { background: var(--lc-gradient); color: #fff; }

/* ===== Input Groups ===== */
.lc-input-label {
    display: block;
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}
.lc-input {
    width: 100%;
    padding: 0.5rem;
    font-size: 0.875rem;
    font-family: var(--font-mono);
    border: 1.5px solid var(--border);
    border-radius: 0.375rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    text-align: center;
    transition: border-color 0.15s;
}
.lc-input:focus {
    outline: none;
    border-color: var(--lc-tool);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.1);
}
.lc-select {
    width: 100%;
    padding: 0.5rem;
    font-size: 0.8125rem;
    font-family: var(--font-sans);
    border: 1.5px solid var(--border);
    border-radius: 0.375rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    transition: border-color 0.15s;
}
.lc-select:focus {
    outline: none;
    border-color: var(--lc-tool);
}

/* ===== Slider ===== */
.lc-slider-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.lc-slider-row .lc-input {
    width: 80px;
    flex-shrink: 0;
}
.lc-slider {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    border-radius: 2px;
    background: var(--border);
    outline: none;
}
.lc-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--lc-tool);
    cursor: pointer;
    border: 2px solid #fff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}
.lc-slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--lc-tool);
    cursor: pointer;
    border: 2px solid #fff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

/* ===== 2-Column Input Row ===== */
.lc-2col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}
@media (max-width: 400px) {
    .lc-2col { grid-template-columns: 1fr; }
}

/* ===== Toggle Row ===== */
.lc-toggle-row {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    cursor: pointer;
}
.lc-toggle-row input[type="checkbox"] {
    width: 14px;
    height: 14px;
    accent-color: var(--lc-tool);
    cursor: pointer;
}

/* ===== Compact input column ===== */
.lc-layout .tool-card-body {
    padding: 0.75rem;
}
.lc-layout .tool-card-header {
    padding: 0.625rem 0.75rem;
    font-size: 0.8125rem;
}

/* ===== Hint text ===== */
.lc-hint {
    font-size: 0.625rem;
    color: var(--text-muted);
    margin-top: 0.15rem;
}

/* ===== Material Chips ===== */
.lc-chip-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    margin-top: 0.35rem;
}
.lc-chip {
    padding: 0.2rem 0.5rem;
    font-size: 0.6rem;
    font-weight: 600;
    border: 1.5px solid var(--border);
    border-radius: 1rem;
    background: var(--bg-primary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
    font-family: var(--font-sans);
}
.lc-chip:hover {
    border-color: var(--lc-tool);
    color: var(--lc-tool);
    background: var(--lc-light);
}

/* ===== Shape Chips ===== */
.lc-shape-chip {
    padding: 0.2rem 0.5rem;
    font-size: 0.65rem;
    font-weight: 700;
    border: 1.5px solid var(--border);
    border-radius: 1rem;
    background: var(--bg-primary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
    font-family: var(--font-mono);
    letter-spacing: 0.05em;
}
.lc-shape-chip:hover, .lc-shape-chip.active {
    border-color: var(--lc-tool);
    color: var(--lc-tool);
    background: var(--lc-light);
}

/* ===== Canvas Diagram Container ===== */
.lc-diagram-wrap {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    overflow: hidden;
    position: relative;
}
.lc-diagram-wrap canvas {
    width: 100%;
    height: auto;
    display: block;
}

/* ===== Result Cards ===== */
.lc-results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}
.lc-result-card {
    padding: 0.625rem 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    border-left: 3px solid var(--lc-tool);
}
.lc-result-label {
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-bottom: 0.15rem;
}
.lc-result-value {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* ===== Image Badges ===== */
.lc-badges {
    display: flex;
    gap: 0.375rem;
    flex-wrap: wrap;
    margin-bottom: 0.75rem;
}
.lc-badge {
    padding: 0.25rem 0.625rem;
    font-size: 0.6875rem;
    font-weight: 600;
    border-radius: 1rem;
    background: var(--lc-light);
    color: var(--lc-tool);
}
.lc-badge-converging { background: #dbeafe; color: #1e40af; }
.lc-badge-diverging { background: #fef3c7; color: #92400e; }
.lc-badge-contact { background: #d1fae5; color: #065f46; }
.lc-badge-separated { background: #fce7f3; color: #9d174d; }

/* ===== Steps ===== */
.lc-step {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}
.lc-step:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}
.lc-step-number {
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    background: var(--lc-gradient);
    color: #fff;
    font-size: 0.6875rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 0.1rem;
}
.lc-step-content {
    flex: 1;
    min-width: 0;
}
.lc-step-desc {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}
.lc-step-math {
    font-size: 1rem;
    overflow-x: auto;
}

/* ===== Educational Content ===== */
.lc-edu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 0.75rem;
}
.lc-edu-card {
    padding: 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    font-size: 0.8125rem;
    line-height: 1.6;
}
.lc-edu-card h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.375rem;
}
.lc-edu-card p {
    margin: 0;
    color: var(--text-secondary);
}

.lc-callout {
    display: flex;
    gap: 0.75rem;
    padding: 1rem;
    border-radius: 0.5rem;
    margin-top: 1rem;
}
.lc-callout-insight {
    background: var(--lc-light);
    border: 1px solid rgba(99, 102, 241, 0.2);
}
.lc-callout-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}
.lc-callout-text {
    font-size: 0.8125rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

/* ===== Quick Examples ===== */
.lc-examples {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}
.lc-example-chip {
    padding: 0.35rem 0.75rem;
    font-size: 0.6875rem;
    font-weight: 600;
    border: 1.5px solid var(--border);
    border-radius: 1rem;
    background: var(--bg-primary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
    font-family: var(--font-sans);
}
.lc-example-chip:hover {
    border-color: var(--lc-tool);
    color: var(--lc-tool);
    background: var(--lc-light);
}

/* ===== Error Alert ===== */
.lc-error {
    padding: 0.75rem 1rem;
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: 0.5rem;
    color: #991b1b;
    font-size: 0.8125rem;
    font-weight: 500;
}
[data-theme="dark"] .lc-error {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.3);
    color: #fca5a5;
}

/* ===== Scroll Animations ===== */
.lc-anim {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s, transform 0.5s;
}
.lc-anim.lc-visible {
    opacity: 1;
    transform: translateY(0);
}
.lc-anim-d1 { transition-delay: 0.1s; }
.lc-anim-d2 { transition-delay: 0.2s; }
.lc-anim-d3 { transition-delay: 0.3s; }

/* ===== Responsive ===== */
@media (max-width: 640px) {
    .lc-results-grid {
        grid-template-columns: 1fr;
    }
    .lc-edu-grid {
        grid-template-columns: 1fr;
    }
    .lc-shape-grid {
        grid-template-columns: 1fr;
    }
}