/*
Theme Name: MathSolver Pro
Theme URI: https://mathsolverpro.com
Author: MathSolver Pro Team
Author URI: https://mathsolverpro.com
Description: A complete international-standard math solver platform theme with 13+ solvers, 10+ calculators, step-by-step solutions, Elementor Pro integration, and modern educational UI.
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.4
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: mathsolver-pro
Tags: education, calculator, math, solver, elementor, responsive, accessibility-ready, custom-colors, custom-menu, featured-images, threaded-comments, translation-ready

MathSolver Pro WordPress Theme
*/

/* ================================
   CSS Variables (Light/Dark Mode)
   ================================ */
:root {
    /* Light Mode Colors */
    --primary-color: #2563eb;
    --secondary-color: #7c3aed;
    --accent-color: #10b981;
    --bg-color: #ffffff;
    --bg-secondary: #f9fafb;
    --text-color: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-heading: 'Inter', -apple-system, sans-serif;
    --font-mono: 'Fira Code', 'Courier New', monospace;
    
    /* Spacing */
    --container-max-width: 1200px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

[data-theme="dark"] {
    --primary-color: #3b82f6;
    --secondary-color: #8b5cf6;
    --accent-color: #34d399;
    --bg-color: #111827;
    --bg-secondary: #1f2937;
    --text-color: #f9fafb;
    --text-secondary: #d1d5db;
    --border-color: #374151;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.3), 0 1px 2px 0 rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
}

/* ================================
   Global Reset & Base Styles
   ================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

/* ================================
   Typography
   ================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-color);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* ================================
   Layout & Container
   ================================ */
.site-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.site-content {
    flex: 1;
    padding: var(--spacing-xl) 0;
}

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    width: 100%;
}

/* ================================
   Header
   ================================ */
.site-header {
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

.site-logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
}

.site-logo img {
    max-height: 50px;
    width: auto;
}

/* Navigation */
.main-navigation ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.main-navigation a {
    color: var(--text-color);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
}

.main-navigation a:hover {
    background-color: var(--bg-secondary);
    color: var(--primary-color);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.mobile-menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 5px 0;
    transition: 0.3s;
}

/* Dark Mode Toggle */
.theme-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.theme-toggle:hover {
    background-color: var(--primary-color);
    color: white;
}

/* ================================
   Footer
   ================================ */
.site-footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ================================
   Math Solver Cards
   ================================ */
.solver-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.solver-card {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.solver-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.solver-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: white;
}

.solver-card h3 {
    margin-bottom: var(--spacing-sm);
}

.solver-card p {
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
}

/* ================================
   Solver Interface
   ================================ */
.solver-interface {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
    box-shadow: var(--shadow-lg);
}

.solver-input-group {
    margin-bottom: var(--spacing-lg);
}

.solver-input-group label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-color);
}

.solver-input-group input,
.solver-input-group select,
.solver-input-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    color: var(--text-color);
    font-size: 1rem;
    font-family: var(--font-mono);
    transition: all 0.2s ease;
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

/* ================================
   Solution Display
   ================================ */
.solution-output {
    background: var(--bg-secondary);
    border: 2px solid var(--accent-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.solution-answer {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
}

.solution-steps {
    margin-top: var(--spacing-lg);
}

.step-item {
    background: var(--bg-color);
    border-left: 4px solid var(--primary-color);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border-radius: var(--radius-sm);
}

.step-number {
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.step-explanation {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: var(--spacing-sm);
}

/* ================================
   Calculator Interface
   ================================ */
.calculator-interface {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    max-width: 500px;
    margin: var(--spacing-xl) auto;
    box-shadow: var(--shadow-lg);
}

.calculator-display {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    font-size: 2rem;
    font-family: var(--font-mono);
    text-align: right;
    margin-bottom: var(--spacing-lg);
    min-height: 60px;
    word-break: break-all;
}

.calculator-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
}

.calc-btn {
    padding: var(--spacing-lg);
    font-size: 1.25rem;
    font-weight: 600;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.calc-btn.operator {
    background: var(--primary-color);
    color: white;
}

.calc-btn.equals {
    background: var(--accent-color);
    color: white;
    grid-column: span 2;
}

/* ================================
   Breadcrumbs
   ================================ */
.breadcrumbs {
    padding: var(--spacing-md) 0;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.breadcrumbs a {
    color: var(--text-secondary);
}

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

.breadcrumbs span {
    margin: 0 var(--spacing-sm);
}

/* ================================
   Responsive Design (Mobile-First)
   ================================ */
@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    
    .main-navigation {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-color);
        border-top: 1px solid var(--border-color);
        padding: var(--spacing-md);
    }
    
    .main-navigation.active {
        display: block;
    }
    
    .main-navigation ul {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .solver-grid {
        grid-template-columns: 1fr;
    }
    
    .calculator-buttons {
        gap: var(--spacing-xs);
    }
    
    .calc-btn {
        padding: var(--spacing-md);
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .solver-interface,
    .calculator-interface {
        padding: var(--spacing-md);
    }
}

/* ================================
   Accessibility
   ================================ */
.screen-reader-text {
    clip: rect(1px, 1px, 1px, 1px);
    position: absolute !important;
    height: 1px;
    width: 1px;
    overflow: hidden;
}

.screen-reader-text:focus {
    background-color: var(--bg-color);
    border-radius: 3px;
    box-shadow: 0 0 2px 2px rgba(0, 0, 0, 0.6);
    clip: auto !important;
    color: var(--text-color);
    display: block;
    font-size: 14px;
    font-weight: bold;
    height: auto;
    left: 5px;
    line-height: normal;
    padding: 15px 23px 14px;
    text-decoration: none;
    top: 5px;
    width: auto;
    z-index: 100000;
}

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

/* ================================
   Animations
   ================================ */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

/* ================================
   Math Content Styling
   ================================ */
.math-content {
    font-family: var(--font-mono);
    background: var(--bg-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    display: inline-block;
}

.mjx-chtml {
    font-size: 1.2em !important;
}

/* ================================
   Utility Classes
   ================================ */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-1 { margin-top: var(--spacing-md); }
.mt-2 { margin-top: var(--spacing-lg); }
.mb-1 { margin-bottom: var(--spacing-md); }
.mb-2 { margin-bottom: var(--spacing-lg); }
.hidden { display: none; }
.flex { display: flex; }
.flex-center { display: flex; justify-content: center; align-items: center; }
.gap-1 { gap: var(--spacing-md); }
.gap-2 { gap: var(--spacing-lg); }