math-ds-complete/style.css

:root {
    /* Primitive Color Tokens */
    --color-white: rgba(255, 255, 255, 1);
    --color-black: rgba(0, 0, 0, 1);
    --color-cream-50: rgba(252, 252, 249, 1);
    --color-cream-100: rgba(255, 255, 253, 1);
    --color-gray-200: rgba(245, 245, 245, 1);
    --color-gray-300: rgba(167, 169, 169, 1);
    --color-gray-400: rgba(119, 124, 124, 1);
    --color-slate-500: rgba(98, 108, 113, 1);
    --color-brown-600: rgba(94, 82, 64, 1);
    --color-charcoal-700: rgba(31, 33, 33, 1);
    --color-charcoal-800: rgba(38, 40, 40, 1);
    --color-slate-900: rgba(19, 52, 59, 1);
    --color-teal-300: rgba(50, 184, 198, 1);
    --color-teal-400: rgba(45, 166, 178, 1);
    --color-teal-500: rgba(33, 128, 141, 1);
    --color-teal-600: rgba(29, 116, 128, 1);
    --color-teal-700: rgba(26, 104, 115, 1);
    --color-teal-800: rgba(41, 150, 161, 1);
    --color-red-400: rgba(255, 84, 89, 1);
    --color-red-500: rgba(192, 21, 47, 1);
    --color-orange-400: rgba(230, 129, 97, 1);
    --color-orange-500: rgba(168, 75, 47, 1);

    /* RGB versions for opacity control */
    --color-brown-600-rgb: 94, 82, 64;
    --color-teal-500-rgb: 33, 128, 141;
    --color-slate-900-rgb: 19, 52, 59;
    --color-slate-500-rgb: 98, 108, 113;
    --color-red-500-rgb: 192, 21, 47;
    --color-red-400-rgb: 255, 84, 89;
    --color-orange-500-rgb: 168, 75, 47;
    --color-orange-400-rgb: 230, 129, 97;

    /* Background color tokens (Light Mode) */
    --color-bg-1: rgba(59, 130, 246, 0.08);
    /* Light blue */
    --color-bg-2: rgba(245, 158, 11, 0.08);
    /* Light yellow */
    --color-bg-3: rgba(34, 197, 94, 0.08);
    /* Light green */
    --color-bg-4: rgba(239, 68, 68, 0.08);
    /* Light red */
    --color-bg-5: rgba(147, 51, 234, 0.08);
    /* Light purple */
    --color-bg-6: rgba(249, 115, 22, 0.08);
    /* Light orange */
    --color-bg-7: rgba(236, 72, 153, 0.08);
    /* Light pink */
    --color-bg-8: rgba(6, 182, 212, 0.08);
    /* Light cyan */

    /* Semantic Color Tokens (Light Mode) */
    --color-background: var(--color-cream-50);
    --color-surface: var(--color-cream-100);
    --color-text: var(--color-slate-900);
    --color-text-secondary: var(--color-slate-500);
    --color-primary: var(--color-teal-500);
    --color-primary-hover: var(--color-teal-600);
    --color-primary-active: var(--color-teal-700);
    --color-secondary: rgba(var(--color-brown-600-rgb), 0.12);
    --color-secondary-hover: rgba(var(--color-brown-600-rgb), 0.2);
    --color-secondary-active: rgba(var(--color-brown-600-rgb), 0.25);
    --color-border: rgba(var(--color-brown-600-rgb), 0.2);
    --color-btn-primary-text: var(--color-cream-50);
    --color-card-border: rgba(var(--color-brown-600-rgb), 0.12);
    --color-card-border-inner: rgba(var(--color-brown-600-rgb), 0.12);
    --color-error: var(--color-red-500);
    --color-success: var(--color-teal-500);
    --color-warning: var(--color-orange-500);
    --color-info: var(--color-slate-500);
    --color-focus-ring: rgba(var(--color-teal-500-rgb), 0.4);
    --color-select-caret: rgba(var(--color-slate-900-rgb), 0.8);

    /* Common style patterns */
    --focus-ring: 0 0 0 3px var(--color-focus-ring);
    --focus-outline: 2px solid var(--color-primary);
    --status-bg-opacity: 0.15;
    --status-border-opacity: 0.25;
    --select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    --select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");

    /* RGB versions for opacity control */
    --color-success-rgb: 33, 128, 141;
    --color-error-rgb: 192, 21, 47;
    --color-warning-rgb: 168, 75, 47;
    --color-info-rgb: 98, 108, 113;

    /* Typography */
    --font-family-base: "FKGroteskNeue", "Geist", "Inter", -apple-system,
        BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-family-mono: "Berkeley Mono", ui-monospace, SFMono-Regular, Menlo,
        Monaco, Consolas, monospace;
    --font-size-xs: 11px;
    --font-size-sm: 12px;
    --font-size-base: 14px;
    --font-size-md: 14px;
    --font-size-lg: 16px;
    --font-size-xl: 18px;
    --font-size-2xl: 20px;
    --font-size-3xl: 24px;
    --font-size-4xl: 30px;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 550;
    --font-weight-bold: 600;
    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --letter-spacing-tight: -0.01em;

    /* Spacing */
    --space-0: 0;
    --space-1: 1px;
    --space-2: 2px;
    --space-4: 4px;
    --space-6: 6px;
    --space-8: 8px;
    --space-10: 10px;
    --space-12: 12px;
    --space-16: 16px;
    --space-20: 20px;
    --space-24: 24px;
    --space-32: 32px;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-base: 8px;
    --radius-md: 10px;
    --radius-lg: 12px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.02);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.04),
        0 2px 4px -1px rgba(0, 0, 0, 0.02);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.04),
        0 4px 6px -2px rgba(0, 0, 0, 0.02);
    --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.15),
        inset 0 -1px 0 rgba(0, 0, 0, 0.03);

    /* Animation */
    --duration-fast: 150ms;
    --duration-normal: 250ms;
    --ease-standard: cubic-bezier(0.16, 1, 0.3, 1);

    /* Layout */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
}

/* Dark mode colors */
@media (prefers-color-scheme: dark) {
    :root {
        /* RGB versions for opacity control (Dark Mode) */
        --color-gray-400-rgb: 119, 124, 124;
        --color-teal-300-rgb: 50, 184, 198;
        --color-gray-300-rgb: 167, 169, 169;
        --color-gray-200-rgb: 245, 245, 245;

        /* Background color tokens (Dark Mode) */
        --color-bg-1: rgba(29, 78, 216, 0.15);
        /* Dark blue */
        --color-bg-2: rgba(180, 83, 9, 0.15);
        /* Dark yellow */
        --color-bg-3: rgba(21, 128, 61, 0.15);
        /* Dark green */
        --color-bg-4: rgba(185, 28, 28, 0.15);
        /* Dark red */
        --color-bg-5: rgba(107, 33, 168, 0.15);
        /* Dark purple */
        --color-bg-6: rgba(194, 65, 12, 0.15);
        /* Dark orange */
        --color-bg-7: rgba(190, 24, 93, 0.15);
        /* Dark pink */
        --color-bg-8: rgba(8, 145, 178, 0.15);
        /* Dark cyan */

        /* Semantic Color Tokens (Dark Mode) */
        --color-background: var(--color-charcoal-700);
        --color-surface: var(--color-charcoal-800);
        --color-text: var(--color-gray-200);
        --color-text-secondary: rgba(var(--color-gray-300-rgb), 0.7);
        --color-primary: var(--color-teal-300);
        --color-primary-hover: var(--color-teal-400);
        --color-primary-active: var(--color-teal-800);
        --color-secondary: rgba(var(--color-gray-400-rgb), 0.15);
        --color-secondary-hover: rgba(var(--color-gray-400-rgb), 0.25);
        --color-secondary-active: rgba(var(--color-gray-400-rgb), 0.3);
        --color-border: rgba(var(--color-gray-400-rgb), 0.3);
        --color-error: var(--color-red-400);
        --color-success: var(--color-teal-300);
        --color-warning: var(--color-orange-400);
        --color-info: var(--color-gray-300);
        --color-focus-ring: rgba(var(--color-teal-300-rgb), 0.4);
        --color-btn-primary-text: var(--color-slate-900);
        --color-card-border: rgba(var(--color-gray-400-rgb), 0.2);
        --color-card-border-inner: rgba(var(--color-gray-400-rgb), 0.15);
        --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.1),
            inset 0 -1px 0 rgba(0, 0, 0, 0.15);
        --button-border-secondary: rgba(var(--color-gray-400-rgb), 0.2);
        --color-border-secondary: rgba(var(--color-gray-400-rgb), 0.2);
        --color-select-caret: rgba(var(--color-gray-200-rgb), 0.8);

        /* Common style patterns - updated for dark mode */
        --focus-ring: 0 0 0 3px var(--color-focus-ring);
        --focus-outline: 2px solid var(--color-primary);
        --status-bg-opacity: 0.15;
        --status-border-opacity: 0.25;
        --select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
        --select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");

        /* RGB versions for dark mode */
        --color-success-rgb: var(--color-teal-300-rgb);
        --color-error-rgb: var(--color-red-400-rgb);
        --color-warning-rgb: var(--color-orange-400-rgb);
        --color-info-rgb: var(--color-gray-300-rgb);
    }
}

/* Data attribute for manual theme switching */
[data-color-scheme="dark"] {
    /* RGB versions for opacity control (dark mode) */
    --color-gray-400-rgb: 119, 124, 124;
    --color-teal-300-rgb: 50, 184, 198;
    --color-gray-300-rgb: 167, 169, 169;
    --color-gray-200-rgb: 245, 245, 245;

    /* Colorful background palette - Dark Mode */
    --color-bg-1: rgba(29, 78, 216, 0.15);
    /* Dark blue */
    --color-bg-2: rgba(180, 83, 9, 0.15);
    /* Dark yellow */
    --color-bg-3: rgba(21, 128, 61, 0.15);
    /* Dark green */
    --color-bg-4: rgba(185, 28, 28, 0.15);
    /* Dark red */
    --color-bg-5: rgba(107, 33, 168, 0.15);
    /* Dark purple */
    --color-bg-6: rgba(194, 65, 12, 0.15);
    /* Dark orange */
    --color-bg-7: rgba(190, 24, 93, 0.15);
    /* Dark pink */
    --color-bg-8: rgba(8, 145, 178, 0.15);
    /* Dark cyan */

    /* Semantic Color Tokens (Dark Mode) */
    --color-background: var(--color-charcoal-700);
    --color-surface: var(--color-charcoal-800);
    --color-text: var(--color-gray-200);
    --color-text-secondary: rgba(var(--color-gray-300-rgb), 0.7);
    --color-primary: var(--color-teal-300);
    --color-primary-hover: var(--color-teal-400);
    --color-primary-active: var(--color-teal-800);
    --color-secondary: rgba(var(--color-gray-400-rgb), 0.15);
    --color-secondary-hover: rgba(var(--color-gray-400-rgb), 0.25);
    --color-secondary-active: rgba(var(--color-gray-400-rgb), 0.3);
    --color-border: rgba(var(--color-gray-400-rgb), 0.3);
    --color-error: var(--color-red-400);
    --color-success: var(--color-teal-300);
    --color-warning: var(--color-orange-400);
    --color-info: var(--color-gray-300);
    --color-focus-ring: rgba(var(--color-teal-300-rgb), 0.4);
    --color-btn-primary-text: var(--color-slate-900);
    --color-card-border: rgba(var(--color-gray-400-rgb), 0.15);
    --color-card-border-inner: rgba(var(--color-gray-400-rgb), 0.15);
    --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.1),
        inset 0 -1px 0 rgba(0, 0, 0, 0.15);
    --color-border-secondary: rgba(var(--color-gray-400-rgb), 0.2);
    --color-select-caret: rgba(var(--color-gray-200-rgb), 0.8);

    /* Common style patterns - updated for dark mode */
    --focus-ring: 0 0 0 3px var(--color-focus-ring);
    --focus-outline: 2px solid var(--color-primary);
    --status-bg-opacity: 0.15;
    --status-border-opacity: 0.25;
    --select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    --select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");

    /* RGB versions for dark mode */
    --color-success-rgb: var(--color-teal-300-rgb);
    --color-error-rgb: var(--color-red-400-rgb);
    --color-warning-rgb: var(--color-orange-400-rgb);
    --color-info-rgb: var(--color-gray-300-rgb);
}

[data-color-scheme="light"] {
    /* RGB versions for opacity control (light mode) */
    --color-brown-600-rgb: 94, 82, 64;
    --color-teal-500-rgb: 33, 128, 141;
    --color-slate-900-rgb: 19, 52, 59;

    /* Semantic Color Tokens (Light Mode) */
    --color-background: var(--color-cream-50);
    --color-surface: var(--color-cream-100);
    --color-text: var(--color-slate-900);
    --color-text-secondary: var(--color-slate-500);
    --color-primary: var(--color-teal-500);
    --color-primary-hover: var(--color-teal-600);
    --color-primary-active: var(--color-teal-700);
    --color-secondary: rgba(var(--color-brown-600-rgb), 0.12);
    --color-secondary-hover: rgba(var(--color-brown-600-rgb), 0.2);
    --color-secondary-active: rgba(var(--color-brown-600-rgb), 0.25);
    --color-border: rgba(var(--color-brown-600-rgb), 0.2);
    --color-btn-primary-text: var(--color-cream-50);
    --color-card-border: rgba(var(--color-brown-600-rgb), 0.12);
    --color-card-border-inner: rgba(var(--color-brown-600-rgb), 0.12);
    --color-error: var(--color-red-500);
    --color-success: var(--color-teal-500);
    --color-warning: var(--color-orange-500);
    --color-info: var(--color-slate-500);
    --color-focus-ring: rgba(var(--color-teal-500-rgb), 0.4);

    /* RGB versions for light mode */
    --color-success-rgb: var(--color-teal-500-rgb);
    --color-error-rgb: var(--color-red-500-rgb);
    --color-warning-rgb: var(--color-orange-500-rgb);
    --color-info-rgb: var(--color-slate-500-rgb);
}

/* Base styles */
html {
    font-size: var(--font-size-base);
    font-family: var(--font-family-base);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
}

*,
*::before,
*::after {
    box-sizing: inherit;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    margin: 0;
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    color: var(--color-text);
    letter-spacing: var(--letter-spacing-tight);
}

h1 {
    font-size: var(--font-size-4xl);
}

h2 {
    font-size: var(--font-size-3xl);
}

h3 {
    font-size: var(--font-size-2xl);
}

h4 {
    font-size: var(--font-size-xl);
}

h5 {
    font-size: var(--font-size-lg);
}

h6 {
    font-size: var(--font-size-md);
}

p {
    margin: 0 0 var(--space-16) 0;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-standard);
}

a:hover {
    color: var(--color-primary-hover);
}

code,
pre {
    font-family: var(--font-family-mono);
    font-size: calc(var(--font-size-base) * 0.95);
    background-color: var(--color-secondary);
    border-radius: var(--radius-sm);
}

code {
    padding: var(--space-1) var(--space-4);
}

pre {
    padding: var(--space-16);
    margin: var(--space-16) 0;
    overflow: auto;
    border: 1px solid var(--color-border);
}

pre code {
    background: none;
    padding: 0;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-8) var(--space-16);
    border-radius: var(--radius-base);
    font-size: var(--font-size-base);
    font-weight: 500;
    line-height: 1.5;
    cursor: pointer;
    transition: all var(--duration-normal) var(--ease-standard);
    border: none;
    text-decoration: none;
    position: relative;
}

.btn:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.btn--primary {
    background: var(--color-primary);
    color: var(--color-btn-primary-text);
}

.btn--primary:hover {
    background: var(--color-primary-hover);
}

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

.btn--secondary {
    background: var(--color-secondary);
    color: var(--color-text);
}

.btn--secondary:hover {
    background: var(--color-secondary-hover);
}

.btn--secondary:active {
    background: var(--color-secondary-active);
}

.btn--outline {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text);
}

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

.btn--sm {
    padding: var(--space-4) var(--space-12);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-sm);
}

.btn--lg {
    padding: var(--space-10) var(--space-20);
    font-size: var(--font-size-lg);
    border-radius: var(--radius-md);
}

.btn--full-width {
    width: 100%;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Form elements */
.form-control {
    display: block;
    width: 100%;
    padding: var(--space-8) var(--space-12);
    font-size: var(--font-size-md);
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-base);
    transition: border-color var(--duration-fast) var(--ease-standard),
        box-shadow var(--duration-fast) var(--ease-standard);
}

textarea.form-control {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
}

select.form-control {
    padding: var(--space-8) var(--space-12);
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: var(--select-caret-light);
    background-repeat: no-repeat;
    background-position: right var(--space-12) center;
    background-size: 16px;
    padding-right: var(--space-32);
}

/* Add a dark mode specific caret */
@media (prefers-color-scheme: dark) {
    select.form-control {
        background-image: var(--select-caret-dark);
    }
}

/* Also handle data-color-scheme */
[data-color-scheme="dark"] select.form-control {
    background-image: var(--select-caret-dark);
}

[data-color-scheme="light"] select.form-control {
    background-image: var(--select-caret-light);
}

.form-control:focus {
    border-color: var(--color-primary);
    outline: var(--focus-outline);
}

.form-label {
    display: block;
    margin-bottom: var(--space-8);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
}

.form-group {
    margin-bottom: var(--space-16);
}

/* Card component */
.card {
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-card-border);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: box-shadow var(--duration-normal) var(--ease-standard);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card__body {
    padding: var(--space-16);
}

.card__header,
.card__footer {
    padding: var(--space-16);
    border-bottom: 1px solid var(--color-card-border-inner);
}

/* Status indicators - simplified with CSS variables */
.status {
    display: inline-flex;
    align-items: center;
    padding: var(--space-6) var(--space-12);
    border-radius: var(--radius-full);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
}

.status--success {
    background-color: rgba(var(--color-success-rgb, 33, 128, 141),
            var(--status-bg-opacity));
    color: var(--color-success);
    border: 1px solid rgba(var(--color-success-rgb, 33, 128, 141), var(--status-border-opacity));
}

.status--error {
    background-color: rgba(var(--color-error-rgb, 192, 21, 47),
            var(--status-bg-opacity));
    color: var(--color-error);
    border: 1px solid rgba(var(--color-error-rgb, 192, 21, 47), var(--status-border-opacity));
}

.status--warning {
    background-color: rgba(var(--color-warning-rgb, 168, 75, 47),
            var(--status-bg-opacity));
    color: var(--color-warning);
    border: 1px solid rgba(var(--color-warning-rgb, 168, 75, 47), var(--status-border-opacity));
}

.status--info {
    background-color: rgba(var(--color-info-rgb, 98, 108, 113),
            var(--status-bg-opacity));
    color: var(--color-info);
    border: 1px solid rgba(var(--color-info-rgb, 98, 108, 113), var(--status-border-opacity));
}

/* Container layout */
.container {
    width: 100%;
    margin-right: auto;
    margin-left: auto;
    padding-right: var(--space-16);
    padding-left: var(--space-16);
}

@media (min-width: 640px) {
    .container {
        max-width: var(--container-sm);
    }
}

@media (min-width: 768px) {
    .container {
        max-width: var(--container-md);
    }
}

@media (min-width: 1024px) {
    .container {
        max-width: var(--container-lg);
    }
}

@media (min-width: 1280px) {
    .container {
        max-width: var(--container-xl);
    }
}

/* Utility classes */
.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-4 {
    gap: var(--space-4);
}

.gap-8 {
    gap: var(--space-8);
}

.gap-16 {
    gap: var(--space-16);
}

.m-0 {
    margin: 0;
}

.mt-8 {
    margin-top: var(--space-8);
}

.mb-8 {
    margin-bottom: var(--space-8);
}

.mx-8 {
    margin-left: var(--space-8);
    margin-right: var(--space-8);
}

.my-8 {
    margin-top: var(--space-8);
    margin-bottom: var(--space-8);
}

.p-0 {
    padding: 0;
}

.py-8 {
    padding-top: var(--space-8);
    padding-bottom: var(--space-8);
}

.px-8 {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
}

.py-16 {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
}

.px-16 {
    padding-left: var(--space-16);
    padding-right: var(--space-16);
}

.block {
    display: block;
}

.hidden {
    display: none;
}

/* 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 {
    outline: var(--focus-outline);
    outline-offset: 2px;
}

/* Dark mode specifics */
[data-color-scheme="dark"] .btn--outline {
    border: 1px solid var(--color-border-secondary);
}

@font-face {
    font-family: 'FKGroteskNeue';
    src: url('https://r2cdn.perplexity.ai/fonts/FKGroteskNeue.woff2') format('woff2');
}

/* END PERPLEXITY DESIGN SYSTEM */
/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #1a1a2e;
    color: #e1e1e1;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Subject Tabs */
.subject-tabs {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.subject-tab {
    padding: 0.6rem 1.5rem;
    background: rgba(74, 144, 226, 0.2);
    border: 2px solid transparent;
    border-radius: 8px;
    color: #a0a0a0;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.subject-tab:hover {
    background: rgba(74, 144, 226, 0.3);
    color: #64ffda;
}

.subject-tab.active {
    background: linear-gradient(135deg, #4a90e2, #64ffda);
    color: #1a1a2e;
    border-color: #64ffda;
    box-shadow: 0 4px 15px rgba(100, 255, 218, 0.3);
}

/* Top Navigation */
.top-nav {
    position: sticky;
    top: 0;
    background: linear-gradient(135deg, #16213e 0%, #0f3460 100%);
    padding: 1rem 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    border-bottom: 2px solid #4a90e2;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.course-title {
    font-size: 1.8rem;
    color: #64ffda;
    font-weight: 700;
    text-shadow: 0 0 20px rgba(100, 255, 218, 0.3);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: #64ffda;
    margin: 3px 0;
    border-radius: 3px;
    transition: all 0.3s ease;
}

/* Main Container */
.main-container {
    display: flex;
    max-width: 1400px;
    margin: 0 auto;
    min-height: calc(100vh - 80px);
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: #16213e;
    padding: 2rem 1rem;
    position: sticky;
    top: 80px;
    height: calc(100vh - 80px);
    overflow-y: auto;
    border-right: 2px solid #0f3460;
    transition: transform 0.3s ease;
}

.sidebar-content h3 {
    color: #64ffda;
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
    text-align: center;
}

.module {
    margin-bottom: 2rem;
}

.module-title {
    color: #4a90e2;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.8rem;
    padding: 0.5rem;
    background: rgba(74, 144, 226, 0.1);
    border-radius: 5px;
    border-left: 3px solid #4a90e2;
}

.topic-list {
    list-style: none;
}

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

.topic-link {
    display: block;
    padding: 0.6rem 0.8rem;
    color: #a0a0a0;
    text-decoration: none;
    border-radius: 5px;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    border-left: 3px solid transparent;
}

.topic-link:hover {
    background: rgba(100, 255, 218, 0.1);
    color: #64ffda;
    border-left-color: #64ffda;
    transform: translateX(5px);
}

.topic-link.active {
    background: rgba(100, 255, 218, 0.15);
    color: #64ffda;
    border-left-color: #64ffda;
    font-weight: 600;
}

/* Scrollbar Styling */
.sidebar::-webkit-scrollbar {
    width: 8px;
}

.sidebar::-webkit-scrollbar-track {
    background: #0f3460;
}

.sidebar::-webkit-scrollbar-thumb {
    background: #4a90e2;
    border-radius: 4px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: #64ffda;
}

/* Main Content */
.content {
    flex: 1;
    padding: 3rem;
    background: #1a1a2e;
}

/* Subject-specific styling */
.topic-section[data-subject="statistics"] .topic-number {
    background: linear-gradient(135deg, #4a90e2, #64ffda);
}

.topic-section[data-subject="linear-algebra"] .topic-number {
    background: linear-gradient(135deg, #b47aea, #e66af5);
}

.topic-section[data-subject="calculus"] .topic-number {
    background: linear-gradient(135deg, #ff6b6b, #ffa94d);
}

.topic-section[data-subject="data-science"] .topic-number {
    background: linear-gradient(135deg, #51cf66, #40c057);
}

.topic-section[data-subject="machine-learning"] .topic-number {
    background: linear-gradient(135deg, #ff6b9d, #c44569);
}

/* ML-specific topic number colors by category */
.topic-number.ml-regression {
    background: linear-gradient(135deg, #4a90e2, #64ffda);
}

.topic-number.ml-classification {
    background: linear-gradient(135deg, #ff6b9d, #ffa94d);
}

.topic-number.ml-clustering {
    background: linear-gradient(135deg, #51cf66, #40c057);
}

.topic-number.ml-reduction {
    background: linear-gradient(135deg, #b47aea, #e66af5);
}

.topic-number.ml-reinforcement {
    background: linear-gradient(135deg, #c44569, #ff6b9d);
}

.topic-number.ml-advanced {
    background: linear-gradient(135deg, #ffa94d, #f39c12);
}

.topic-section[data-subject="linear-algebra"] .topic-header h2 {
    color: #b47aea;
}

.topic-section[data-subject="calculus"] .topic-header h2 {
    color: #ff6b6b;
}

.topic-section[data-subject="data-science"] .topic-header h2 {
    color: #51cf66;
}

.topic-section[data-subject="machine-learning"] .topic-header h2 {
    color: #ff6b9d;
}

/* ML section styling */
.ml-section {
    border-left: 4px solid rgba(255, 107, 157, 0.3);
    padding-left: 20px;
}

.ml-section .worked-example-section {
    border: 2px solid rgba(255, 107, 157, 0.2);
}

.ml-section .code-block {
    background: rgba(0, 0, 0, 0.4);
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid #ff6b9d;
    font-family: 'Courier New', monospace;
    overflow-x: auto;
}

.ml-section .code-block code {
    color: #64ffda;
    font-size: 14px;
    line-height: 1.8;
}

/* Topic Section */
.topic-section {
    margin-bottom: 4rem;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease forwards;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.topic-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 3px solid #0f3460;
}

.topic-number {
    display: inline-block;
    background: linear-gradient(135deg, #4a90e2, #64ffda);
    color: #1a1a2e;
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 0.8rem;
}

.topic-header h2 {
    font-size: 2.5rem;
    color: #64ffda;
    margin-bottom: 0.5rem;
    text-shadow: 0 0 20px rgba(100, 255, 218, 0.2);
}

.topic-subtitle {
    color: #a0a0a0;
    font-size: 1.1rem;
    font-style: italic;
}

/* Content Cards */
.content-card {
    background: #16213e;
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    border: 1px solid #0f3460;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.content-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(74, 144, 226, 0.2);
}

.content-card h3 {
    color: #4a90e2;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.content-card h4 {
    margin-top: 1rem;
    margin-bottom: 0.8rem;
    font-size: 1.2rem;
}

.content-card p {
    margin-bottom: 1rem;
    color: #d0d0d0;
    line-height: 1.8;
}

.content-card ul,
.content-card ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.content-card li {
    margin-bottom: 0.5rem;
    color: #d0d0d0;
}

/* Callout Boxes */
.callout-box {
    padding: 1.5rem;
    border-radius: 10px;
    margin-bottom: 2rem;
    border-left: 4px solid;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.callout-header {
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.callout-box.insight {
    background: rgba(100, 255, 218, 0.1);
    border-left-color: #64ffda;
}

.callout-box.insight .callout-header {
    color: #64ffda;
}

.callout-box.warning {
    background: rgba(255, 107, 107, 0.1);
    border-left-color: #ff6b6b;
}

.callout-box.warning .callout-header {
    color: #ff6b6b;
}

.callout-box.tip {
    background: rgba(81, 207, 102, 0.1);
    border-left-color: #51cf66;
}

.callout-box.tip .callout-header {
    color: #51cf66;
}

.callout-box.example {
    background: rgba(74, 144, 226, 0.1);
    border-left-color: #4a90e2;
}

.callout-box.example .callout-header {
    color: #4a90e2;
}

.callout-box p,
.callout-box ul,
.callout-box ol {
    color: #d0d0d0;
}

/* Formula Cards */
.formula-card {
    background: linear-gradient(135deg, #0f3460 0%, #16213e 100%);
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    border: 2px solid #4a90e2;
    box-shadow: 0 4px 20px rgba(74, 144, 226, 0.2);
}

.formula-header {
    color: #64ffda;
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.formula-main {
    font-size: 1.8rem;
    text-align: center;
    margin: 1.5rem 0;
    color: #fff;
    font-family: 'Courier New', monospace;
}

.formula-symbol {
    color: #64ffda;
    font-weight: 700;
    font-size: 2rem;
}

.formula-var {
    color: #64ffda;
    font-weight: 600;
}

.formula-fraction {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    margin: 0 0.5rem;
    vertical-align: middle;
}

.formula-numerator,
.formula-denominator {
    padding: 0.2rem 0.5rem;
}

.formula-line {
    width: 100%;
    height: 2px;
    background: #fff;
    margin: 0.2rem 0;
}

.formula-steps {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.formula-steps p {
    color: #a0a0a0;
    margin-bottom: 0.5rem;
}

.formula-steps ol,
.formula-steps ul {
    margin-left: 2rem;
    color: #d0d0d0;
}

.formula-steps li {
    margin-bottom: 0.5rem;
}

/* Interactive Container */
.interactive-container {
    background: #16213e;
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    border: 2px solid #4a90e2;
    box-shadow: 0 4px 20px rgba(74, 144, 226, 0.3);
}

.interactive-container h3 {
    color: #64ffda;
    margin-bottom: 1.5rem;
    text-align: center;
    font-size: 1.5rem;
}

.interactive-container canvas {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 0 auto 1.5rem;
    background: #0f3460;
    border-radius: 8px;
    border: 1px solid #4a90e2;
}

/* Controls */
.controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    width: 100%;
    max-width: 600px;
}

.input-group label {
    color: #64ffda;
    font-weight: 600;
}

.form-control {
    padding: 0.8rem;
    background: #0f3460;
    border: 2px solid #4a90e2;
    border-radius: 8px;
    color: #e1e1e1;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: #64ffda;
    box-shadow: 0 0 10px rgba(100, 255, 218, 0.3);
}

.slider-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    width: 100%;
}

.slider-group label {
    color: #64ffda;
    font-weight: 600;
}

.slider {
    width: 100%;
    height: 8px;
    border-radius: 5px;
    background: #0f3460;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #64ffda;
    cursor: pointer;
    box-shadow: 0 0 10px rgba(100, 255, 218, 0.5);
    transition: all 0.3s ease;
}

.slider::-webkit-slider-thumb:hover {
    background: #4a90e2;
    transform: scale(1.2);
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #64ffda;
    cursor: pointer;
    border: none;
    box-shadow: 0 0 10px rgba(100, 255, 218, 0.5);
}

/* Buttons */
.btn {
    padding: 0.8rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.btn-primary {
    background: linear-gradient(135deg, #4a90e2, #64ffda);
    color: #1a1a2e;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(100, 255, 218, 0.4);
}

.btn-secondary {
    background: #0f3460;
    color: #64ffda;
    border: 2px solid #4a90e2;
}

.btn-secondary:hover {
    background: #16213e;
    transform: translateY(-2px);
}

/* Results Display */
.results {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    width: 100%;
    margin-top: 1rem;
}

.result-item {
    background: #0f3460;
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    border: 2px solid #4a90e2;
}

.result-label {
    display: block;
    color: #64ffda;
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.result-item span:last-child {
    display: block;
    color: #fff;
    font-size: 1.5rem;
    font-weight: 700;
}

/* Tables */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    background: #0f3460;
    border-radius: 8px;
    overflow: hidden;
}

.comparison-table thead {
    background: linear-gradient(135deg, #4a90e2, #64ffda);
    color: #1a1a2e;
}

.comparison-table th,
.comparison-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #16213e;
}

.comparison-table th {
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 1px;
}

.comparison-table tbody tr {
    transition: background 0.3s ease;
}

.comparison-table tbody tr:hover {
    background: rgba(74, 144, 226, 0.1);
}

.comparison-table td {
    color: #d0d0d0;
}

/* Two Column Layout */
.two-column {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 1.5rem 0;
}

.column {
    background: #0f3460;
    padding: 1.5rem;
    border-radius: 8px;
    border: 2px solid rgba(74, 144, 226, 0.3);
}

/* Comparison Grid */
.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.comparison-item {
    background: #0f3460;
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid #4a90e2;
}

/* Data Tree */
.data-tree {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    padding: 2rem;
    margin: 1.5rem 0;
}

.tree-level-1,
.tree-level-2,
.tree-level-3 {
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
}

.tree-node {
    padding: 1rem 2rem;
    background: #0f3460;
    border: 2px solid #4a90e2;
    border-radius: 8px;
    color: #64ffda;
    font-weight: 600;
    position: relative;
    transition: all 0.3s ease;
}

.tree-node:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(74, 144, 226, 0.4);
}

.tree-node.main {
    font-size: 1.3rem;
    background: linear-gradient(135deg, #4a90e2, #64ffda);
    color: #1a1a2e;
}

.tree-node.categorical {
    border-color: #64ffda;
}

.tree-node.numerical {
    border-color: #ff6b6b;
}

/* Use Case List */
.use-case-list {
    list-style: none;
    margin-left: 0;
}

.use-case-list li {
    padding: 1rem;
    margin-bottom: 1rem;
    background: #0f3460;
    border-radius: 8px;
    border-left: 4px solid #4a90e2;
    transition: all 0.3s ease;
}

.use-case-list li:hover {
    transform: translateX(5px);
    border-left-color: #64ffda;
}

/* Example Solution */
.example-solution {
    background: #0f3460;
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 1rem;
    font-family: 'Courier New', monospace;
}

.example-solution p {
    margin-bottom: 0.8rem;
    color: #d0d0d0;
}

.example-solution strong {
    color: #64ffda;
}

/* Summary Card */
.summary-card {
    background: linear-gradient(135deg, #0f3460 0%, #16213e 100%);
    padding: 2rem;
    border-radius: 12px;
    border: 2px solid #64ffda;
    box-shadow: 0 4px 20px rgba(100, 255, 218, 0.3);
    margin-bottom: 2rem;
}

.summary-card h3 {
    color: #64ffda;
    margin-bottom: 1rem;
    font-size: 1.5rem;
    text-align: center;
}

.summary-card ul {
    list-style: none;
    margin-left: 0;
}

.summary-card li {
    padding: 0.8rem;
    margin-bottom: 0.8rem;
    background: rgba(100, 255, 218, 0.05);
    border-radius: 6px;
    border-left: 3px solid #64ffda;
    color: #d0d0d0;
}

.summary-card li::before {
    content: "✓";
    color: #64ffda;
    font-weight: 700;
    margin-right: 0.8rem;
}

/* Data Examples Table */
.data-examples-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.data-examples-table th,
.data-examples-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid rgba(74, 144, 226, 0.2);
}

.data-examples-table th {
    background: rgba(74, 144, 226, 0.2);
    color: #64ffda;
    font-weight: 600;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .subject-tabs {
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .subject-tab {
        font-size: 0.8rem;
        padding: 0.5rem 1rem;
    }

    .main-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        position: static;
        transform: translateX(-100%);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .mobile-menu-btn {
        display: flex;
    }

    .content {
        padding: 2rem 1.5rem;
    }

    .topic-header h2 {
        font-size: 2rem;
    }

    .two-column {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .course-title {
        font-size: 1.3rem;
    }

    .content {
        padding: 1.5rem 1rem;
    }

    .topic-header h2 {
        font-size: 1.6rem;
    }

    .formula-main {
        font-size: 1.3rem;
    }

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

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

    .interactive-container canvas {
        max-width: 100%;
        height: auto;
    }
}

/* Worked Example Section Styles */
.worked-example-section {
    background: linear-gradient(135deg, #1e3a5f 0%, #2d4a6f 100%);
    border-radius: 12px;
    padding: 30px;
    margin: 40px 0;
    border-left: 5px solid #64ffda;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
}

.example-problem {
    background: rgba(255, 255, 255, 0.08);
    padding: 25px;
    border-radius: 10px;
    margin-bottom: 30px;
    border: 2px solid #64ffda;
}

.problem-statement {
    font-size: 19px;
    font-weight: 600;
    color: #64ffda;
    line-height: 1.6;
}

.solution-step {
    display: flex;
    gap: 20px;
    margin: 25px 0;
    padding: 25px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 10px;
    border-left: 4px solid #4a90e2;
    transition: all 0.3s ease;
}

.solution-step:hover {
    background: rgba(0, 0, 0, 0.4);
    border-left-width: 6px;
    transform: translateX(5px);
}

.step-number {
    font-weight: 700;
    color: #64ffda;
    font-size: 20px;
    min-width: 90px;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
}

.step-description {
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 12px;
}

.step-work {
    background: rgba(0, 0, 0, 0.4);
    padding: 18px;
    border-radius: 8px;
    margin: 12px 0;
    font-family: 'Courier New', monospace;
    border-left: 3px solid #ff6b6b;
    overflow-x: auto;
}

.step-work code {
    display: block;
    color: #e1e1e1;
    font-size: 14px;
    line-height: 1.8;
    margin: 4px 0;
}

.step-explanation {
    font-style: italic;
    color: #a0a0a0;
    font-size: 14px;
    margin-top: 10px;
}

.calculation-table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    overflow: hidden;
}

.calculation-table th,
.calculation-table td {
    padding: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.calculation-table th {
    background: #4a90e2;
    font-weight: 600;
    color: #fff;
}

.calculation-table tbody tr:hover {
    background: rgba(100, 255, 218, 0.1);
}

.final-answer {
    background: linear-gradient(135deg, #51cf66 0%, #37b24d 100%);
    padding: 25px;
    border-radius: 10px;
    margin-top: 30px;
    text-align: center;
    font-size: 18px;
    box-shadow: 0 4px 12px rgba(81, 207, 102, 0.3);
}

.answer-highlight {
    font-weight: 700;
    font-size: 24px;
    color: white;
    display: block;
    margin-top: 12px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.verification {
    background: rgba(100, 255, 218, 0.1);
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid #51cf66;
    margin-top: 20px;
}

.verification strong {
    color: #51cf66;
    font-size: 16px;
}

.verification p {
    color: #d0d0d0;
    margin-top: 10px;
    line-height: 1.6;
}

.practice-problems {
    background: rgba(74, 144, 226, 0.1);
    padding: 25px;
    border-radius: 10px;
    margin-top: 30px;
    border: 2px solid #4a90e2;
}

.practice-problems h4 {
    color: #64ffda;
    margin-bottom: 15px;
    font-size: 18px;
}

.practice-problems ol {
    margin: 15px 0 15px 25px;
    color: #d0d0d0;
}

.practice-problems li {
    margin-bottom: 10px;
    line-height: 1.6;
}

.show-answers-btn {
    background: #4a90e2;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    margin: 10px 0;
    transition: all 0.3s ease;
}

.show-answers-btn:hover {
    background: #64ffda;
    color: #1a1a2e;
    transform: translateY(-2px);
}

.practice-answers {
    background: rgba(0, 0, 0, 0.3);
    padding: 20px;
    border-radius: 8px;
    margin-top: 15px;
    border-left: 4px solid #51cf66;
}

.practice-answers p strong {
    color: #51cf66;
}

.practice-answers ol {
    margin-left: 25px;
    color: #e1e1e1;
}

/* Animations */
@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

.pulse {
    animation: pulse 2s ease-in-out infinite;
}

/* Loading State */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(100, 255, 218, 0.3);
    border-radius: 50%;
    border-top-color: #64ffda;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Smooth Transitions */
* {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* ========== SEARCH FUNCTIONALITY ========== */
.search-container {
    position: relative;
    margin: 0 1.5rem;
    flex-shrink: 0;
}

.search-input {
    width: 280px;
    padding: 0.7rem 1rem 0.7rem 1rem;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(100, 255, 218, 0.2);
    border-radius: 10px;
    color: #e1e1e1;
    font-size: 0.9rem;
    outline: none;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.search-input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.search-input:focus {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(100, 255, 218, 0.5);
    box-shadow: 0 0 20px rgba(100, 255, 218, 0.15);
    width: 320px;
}

.search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(26, 26, 46, 0.98);
    border: 1px solid rgba(100, 255, 218, 0.2);
    border-radius: 10px;
    margin-top: 0.5rem;
    max-height: 400px;
    overflow-y: auto;
    z-index: 1000;
    display: none;
    backdrop-filter: blur(20px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.search-results.active {
    display: block;
    animation: slideDown 0.2s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.search-result-item {
    padding: 0.8rem 1rem;
    cursor: pointer;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.2s ease;
}

.search-result-item:hover {
    background: rgba(100, 255, 218, 0.1);
}

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

.search-result-title {
    color: #64ffda;
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 0.2rem;
}

.search-result-subject {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.search-highlight {
    background: rgba(100, 255, 218, 0.3);
    border-radius: 2px;
    padding: 0 2px;
}

.no-results {
    padding: 1.5rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
}

/* Topic completion checkbox */
.topic-complete-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(100, 255, 218, 0.1);
    border: 1px solid rgba(100, 255, 218, 0.3);
    border-radius: 8px;
    color: #64ffda;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 1rem;
}

.topic-complete-btn:hover {
    background: rgba(100, 255, 218, 0.2);
    transform: translateY(-2px);
}

.topic-complete-btn.completed {
    background: rgba(81, 207, 102, 0.2);
    border-color: #51cf66;
    color: #51cf66;
}

.topic-complete-btn .check-icon {
    width: 18px;
    height: 18px;
    border: 2px solid currentColor;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
}

.topic-complete-btn.completed .check-icon::after {
    content: '✓';
}

/* Sidebar topic completed state */
.topic-link.completed {
    color: #51cf66 !important;
    position: relative;
}

.topic-link.completed::before {
    content: '✓ ';
    font-weight: bold;
}

/* ========== MICRO-ANIMATIONS ========== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }

    100% {
        background-position: 200% 0;
    }
}

@keyframes glow {

    0%,
    100% {
        box-shadow: 0 0 5px rgba(100, 255, 218, 0.3);
    }

    50% {
        box-shadow: 0 0 20px rgba(100, 255, 218, 0.6);
    }
}

.topic-section {
    animation: fadeInUp 0.5s ease forwards;
}

.content-card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.content-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.callout-box {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.callout-box:hover {
    transform: translateX(5px);
}

/* Button hover effects */
.btn-primary,
.btn-secondary,
.subject-tab {
    position: relative;
    overflow: hidden;
}

.btn-primary::after,
.btn-secondary::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s ease, height 0.6s ease;
}

.btn-primary:hover::after,
.btn-secondary:hover::after {
    width: 300px;
    height: 300px;
}

/* ========== GLASSMORPHISM EFFECTS ========== */
.formula-card {
    background: rgba(255, 255, 255, 0.03) !important;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(100, 255, 218, 0.1) !important;
}

.summary-card {
    background: linear-gradient(135deg, rgba(100, 255, 218, 0.05), rgba(74, 144, 226, 0.05)) !important;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(100, 255, 218, 0.2) !important;
}

/* ========== IMPROVED TYPOGRAPHY ========== */
body {
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif !important;
}

.formula-card,
code,
pre,
.formula-main {
    font-family: 'JetBrains Mono', 'Consolas', monospace !important;
}

/* MathJax styling */
.MathJax {
    font-size: 1.1em !important;
}

mjx-container[jax="CHTML"] {
    margin: 0.5em 0 !important;
}

/* ========== INTERACTIVE ELEMENT IMPROVEMENTS ========== */
canvas {
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    transition: box-shadow 0.3s ease;
}

canvas:hover {
    box-shadow: 0 8px 30px rgba(100, 255, 218, 0.2);
}

.controls {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    align-items: center;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 10px;
    margin-top: 1rem;
}

.slider-group {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.slider-group label {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 150px;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: linear-gradient(135deg, #4a90e2, #64ffda);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
    transition: transform 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* ========== RESPONSIVE ADJUSTMENTS ========== */
@media (max-width: 1200px) {
    .search-container {
        order: 3;
        margin: 0.5rem 0;
        width: 100%;
    }

    .search-input {
        width: 100%;
    }

    .search-input:focus {
        width: 100%;
    }
}

@media (max-width: 768px) {
    .search-container {
        display: none;
    }
}