/* ========================================
   BOOTSTRAP EDUCATIONAL APPS - SHARED STYLES
   Based on Solarized Light Theme
   ======================================== */

/* ========================================
   1. SOLARIZED LIGHT VARIABLES
   ======================================== */
:root {
    /* Solarized Light Color Palette */
    --base03: #002b36;
    --base02: #073642;
    --base01: #586e75;
    --base00: #657b83;
    --base0: #839496;
    --base1: #93a1a1;
    --base2: #eee8d5;
    --base3: #fdf6e3;
    --yellow: #b58900;
    --orange: #cb4b16;
    --red: #dc322f;
    --magenta: #d33682;
    --violet: #6c71c4;
    --blue: #268bd2;
    --cyan: #2aa198;
    --green: #859900;

    /* Educational Semantic Mappings */
    --edu-primary: var(--orange);
    --edu-success: var(--green);
    --edu-error: var(--red);
    --edu-warning: var(--yellow);
}

/* ========================================
   2. BOOTSTRAP OVERRIDES
   ======================================== */

/* Body Styles */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    background-color: var(--base3);
    color: var(--base00);
    padding: 20px;
}

/* Container Styles */
.container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--base3);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

/* Accordion Styles */
.accordion {
    border: 1px solid var(--base1);
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 20px;
}

.accordion-item {
    border-bottom: 1px solid var(--base1);
    background: var(--base3);
}

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

.accordion-button {
    background-color: var(--base2);
    color: var(--base01);
    font-weight: 600;
    font-size: 1.1rem;
    padding: 1rem 1.25rem;
    border: none;
}

.accordion-button:not(.collapsed) {
    background-color: var(--blue);
    color: var(--base3);
    box-shadow: none;
}

.accordion-button:focus {
    box-shadow: none;
    border-color: var(--base1);
}

.accordion-button::after {
    filter: brightness(0.5);
}

.accordion-button:not(.collapsed)::after {
    filter: brightness(0) invert(1);
}

.accordion-body {
    padding: 1.25rem;
    background-color: var(--base3);
    border-top: 1px solid var(--base1);
}

/* Card Styles */
.card {
    background-color: var(--base3);
    border: 1px solid var(--base1);
    border-radius: 6px;
}

.card-header {
    background-color: var(--base2);
    border-bottom: 1px solid var(--base1);
    color: var(--base01);
    font-weight: 600;
}

.card-body {
    background-color: var(--base3);
    color: var(--base00);
}

/* Button Overrides */
.btn-outline-secondary {
    color: var(--base01);
    border-color: var(--base1);
    background-color: transparent;
}

.btn-outline-secondary:hover {
    color: var(--base3);
    background-color: var(--base01);
    border-color: var(--base01);
}

.btn-outline-secondary:focus {
    box-shadow: 0 0 0 0.2rem rgba(88, 110, 117, 0.25);
}

/* Form Controls */
.form-control {
    background-color: var(--base3);
    border: 1px solid var(--base1);
    color: var(--base00);
}

.form-control:focus {
    background-color: var(--base3);
    border-color: var(--blue);
    box-shadow: 0 0 0 0.2rem rgba(38, 139, 210, 0.25);
    color: var(--base00);
}

.form-control::placeholder {
    color: var(--base0);
}

/* Table Styles */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
}

table th {
    background-color: var(--base01);
    color: var(--base3);
    padding: 12px;
    text-align: left;
    font-weight: 600;
}

table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--base1);
}

table tr:last-child td {
    border-bottom: none;
}

table tr:nth-child(even) {
    background-color: var(--base2);
}

/* Links */
a {
    color: var(--blue);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
    color: var(--cyan);
}

/* Lists */
ul, ol {
    margin: 10px 0;
    padding-left: 25px;
}

li {
    margin-bottom: 8px;
}

/* Headings */
h1 {
    color: var(--orange);
    font-size: 2rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

h2 {
    color: var(--blue);
    font-size: 1.75rem;
    margin-bottom: 1rem;
}

h3 {
    color: var(--cyan);
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

h4 {
    color: var(--magenta);
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

h5 {
    color: var(--magenta);
    margin-top: 1.5rem;
    margin-bottom: 1rem;
}

h6 {
    color: var(--violet);
    margin-top: 1rem;
    font-weight: 600;
}

/* Blockquotes */
blockquote {
    background-color: var(--base2);
    padding: 15px 20px;
    border-left: 4px solid var(--violet);
    margin: 15px 0;
    font-style: italic;
}

/* ========================================
   3. EDUCATIONAL COMPONENTS
   ======================================== */

.edu-question {
    background: var(--base2);
    border-left: 5px solid var(--orange);
    padding: 15px 20px;
    margin: 15px 0;
    border-radius: 0 4px 4px 0;
}

.edu-formula {
    background: var(--base2);
    border-left: 5px solid var(--blue);
    padding: 15px 20px;
    margin: 15px 0;
    font-family: 'Latin Modern Math', 'Times New Roman', serif;
    font-size: 1.25rem;
    text-align: center;
    font-style: italic;
    border-radius: 0 4px 4px 0;
}

.edu-flow-display {
    font-family: 'Courier New', Monaco, monospace;
    font-size: 1.125rem;
    font-weight: bold;
    text-align: center;
    margin: 10px 0;
    color: var(--base01);
}

.edu-table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
    border: 1px solid var(--base1);
    border-radius: 6px;
    overflow: hidden;
}

.edu-table th {
    background-color: var(--base01);
    color: var(--base3);
    padding: 12px;
    text-align: center;
    font-weight: 600;
}

.edu-table td {
    padding: 10px 12px;
    border: 1px solid var(--base1);
    text-align: center;
    background-color: var(--base3);
}

.edu-table tr:nth-child(even) td {
    background-color: var(--base2);
}

/* ========================================
   4. FEEDBACK STATES
   ======================================== */

.edu-success {
    background: #f0fff0;
    color: var(--green);
    border: 2px solid var(--green);
    padding: 15px;
    margin: 10px 0;
    font-weight: bold;
    border-radius: 6px;
}

.edu-error {
    background: #fff0f0;
    color: var(--red);
    border: 2px solid var(--red);
    padding: 15px;
    margin: 10px 0;
    font-weight: bold;
    border-radius: 6px;
}

.edu-warning {
    background: #fffbf0;
    color: var(--yellow);
    border: 2px solid var(--yellow);
    padding: 15px;
    margin: 10px 0;
    font-weight: bold;
    border-radius: 6px;
}

.edu-code {
    font-family: 'Courier New', Monaco, monospace;
    background: var(--base2);
    border: 1px solid var(--base1);
    padding: 15px;
    margin: 10px 0;
    white-space: pre-wrap;
    font-size: 0.875rem;
    line-height: 1.4;
    border-radius: 4px;
    color: var(--base01);
}

/* ========================================
   5. UTILITY CLASSES
   ======================================== */

.edu-two-column {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 20px 0;
}

@media (max-width: 768px) {
    .edu-two-column {
        grid-template-columns: 1fr;
    }
}

.edu-input-row {
    margin: 15px 0;
}

.edu-input-row label {
    display: block;
    font-weight: bold;
    margin-bottom: 5px;
    color: var(--base01);
}

.edu-highlight {
    background-color: var(--yellow);
    color: var(--base3);
    padding: 2px 6px;
    border-radius: 3px;
}

.edu-text-red {
    color: var(--red);
    font-weight: bold;
}

.edu-text-blue {
    color: var(--blue);
    font-weight: bold;
}

.edu-text-green {
    color: var(--green);
    font-weight: bold;
}

.edu-instructor-info {
    background-color: var(--base2);
    padding: 20px;
    border-radius: 6px;
    margin-bottom: 30px;
    border-left: 4px solid var(--cyan);
}

.edu-instructor-info p {
    margin-bottom: 0.5rem;
}

/* ========================================
   6. APP-SPECIFIC SECTION
   ======================================== */

/* App-specific overrides */
[data-app="arbitrage"] {
    /* Arbitrage app specific styles */
}

[data-app="discounting"] {
    /* Discounting app specific styles */
}

[data-app="recursive-utility"] {
    /* Recursive utility app specific styles */
}

[data-app="ppf"] {
    /* PPF app specific styles */
}

/* ========================================
   7. KATEX STYLING (Solarized Colors)
   ======================================== */

/* KaTeX math text color - use Solarized base01 for emphasis */
.katex {
    color: var(--base01);
}

/* KaTeX display math - centered with proper spacing */
.katex-display {
    color: var(--base01);
    margin: 0.75em 0;
}

/* KaTeX inside edu-formula - use blue accent */
.edu-formula .katex {
    color: var(--blue);
}

/* KaTeX inside edu-code (solutions) - use base01 */
.edu-code .katex {
    color: var(--base01);
}

/* KaTeX inside success/error/warning feedback */
.edu-success .katex {
    color: var(--green);
}

.edu-error .katex {
    color: var(--red);
}

.edu-warning .katex {
    color: var(--yellow);
}

/* ========================================
   8. RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .container {
        padding: 20px;
    }

    .edu-formula {
        font-size: 1.1rem;
    }

    .edu-flow-display {
        font-size: 1rem;
    }

    table {
        font-size: 0.9rem;
    }

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

@media (max-width: 576px) {
    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .accordion-button {
        font-size: 1rem;
        padding: 0.75rem 1rem;
    }

    .edu-question,
    .edu-formula {
        padding: 12px 15px;
    }
}