/*
Theme Name: Interactive Studying
Theme URI: https://interactive-studying.com/
Author: Deyan Yalamov
Author URI: https://interactive-studying.com/
Description: A premium, minimalist, high-performance custom WordPress theme for Interactive Studying LTD.
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: interactivestudying
Tags: custom-menu, featured-images, translation-ready, accessibility-ready, grid-layout, education
*/

/* --- Google Fonts Import --- */
@import url('https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,300;0,400;0,500;0,700;1,400&display=swap');

/* --- Design System & CSS Variables --- */
:root {
    /* Color Palette */
    --color-primary: #6990CB;      /* Slate Blue */
    --color-secondary: #EA5C5C;    /* Coral */
    --color-accent: #6990CB;       /* Slate Blue Accent */
    --color-bg: #F5F7FA;           /* Sleek Light Slate Off-White */
    --color-text-primary: #333333; /* Dark Charcoal */
    --color-text-muted: #666666;   /* Gray for captions/subtext */
    --color-link: #40254A;         /* Deep Purple */
    --color-link-hover: #EA5C5C;   /* Coral link hover */
    --color-border: #D1D8E0;       /* Border line color */
    --color-white: #FFFFFF;

    /* Typography Scale (MD3 Roboto guidelines) */
    --font-family: 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
    --type-eyebrow: 14px;          /* h1 - tracking category label */
    --type-h2: 50px;              /* Large hero & section headers */
    --type-h3: 24px;              /* Section subheadings */
    --type-body: 16px;            /* Standard body text */
    --type-small: 14px;           /* Footer and caption text */

    /* Grid & Spacing System (Strict 4px base unit) */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    --space-20: 80px;
    --space-24: 96px;

    /* Styling Properties */
    --border-radius: 0px;          /* Sharp flat UI aesthetic */
    --transition-fast: 200ms ease; /* Fast Swiss-style transition */
    --transition-normal: 250ms ease;
    --container-width: 1200px;
}

/* --- Base CSS Resets --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    font-size: var(--type-body);
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* Typography Defaults */
h1 {
    font-size: var(--type-eyebrow);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-secondary);
    margin-bottom: var(--space-4);
    display: inline-block;
}

h2 {
    font-size: var(--type-h2);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
    margin-bottom: var(--space-6);
}

h3 {
    font-size: var(--type-h3);
    font-weight: 500;
    line-height: 1.3;
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
}

p {
    margin-bottom: var(--space-4);
}

a {
    color: var(--color-link);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Keyboard Focus States (Accessibility) */
a:focus-visible {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
}

a:focus {
    outline: none;
}

button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
}

button:focus, input:focus, select:focus, textarea:focus {
    outline: none;
}


/* --- Layout Components --- */
.container {
    max-width: var(--container-width);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
}

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

.grid-2 {
    grid-template-columns: 1fr;
}

.grid-3 {
    grid-template-columns: 1fr;
}

@media (min-width: 768px) {
    .grid-2 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .grid-3 {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Spacing Helpers */
.py-section {
    padding-top: var(--space-20);
    padding-bottom: var(--space-20);
}

.mt-auto {
    margin-top: auto;
}

/* --- Interactive Navigation Header --- */
.site-header {
    background-color: var(--color-white);
    border-bottom: 2px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: padding var(--transition-normal);
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.site-branding {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.site-branding a {
    color: var(--color-text-primary);
}

.site-branding a span {
    color: var(--color-secondary);
}

/* Primary Navigation */
.main-navigation ul {
    list-style: none;
    display: flex;
    gap: var(--space-8);
}

.main-navigation a {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--space-2) 0;
    position: relative;
}

.main-navigation a:hover,
.main-navigation li.current-menu-item a {
    color: var(--color-primary);
}

.main-navigation a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width var(--transition-fast);
}

.main-navigation a:hover::after,
.main-navigation li.current-menu-item a::after {
    width: 100%;
}

/* Mobile Nav Toggle */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--color-text-primary);
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }
    .main-navigation {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background-color: var(--color-white);
        border-bottom: 2px solid var(--color-border);
        padding: var(--space-6);
        box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    }
    .main-navigation.is-active {
        display: block;
    }
    .main-navigation ul {
        flex-direction: column;
        gap: var(--space-4);
        align-items: flex-start;
    }
}

/* --- Hero & Sections --- */
.hero-block {
    background-color: var(--color-white);
    border-bottom: 2px solid var(--color-border);
    padding-top: var(--space-24);
    padding-bottom: var(--space-24);
}

.hero-block h2 {
    max-width: 900px;
}

.hero-lead {
    font-size: 20px;
    color: var(--color-text-muted);
    max-width: 750px;
    margin-bottom: var(--space-8);
}

/* Portal Twin Column Panels */
.portal-card {
    background-color: var(--color-white);
    border: 2px solid var(--color-border);
    padding: var(--space-10);
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.portal-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-primary);
}

.portal-card .card-icon {
    font-size: 40px;
    color: var(--color-primary);
    margin-bottom: var(--space-6);
}

.portal-card p {
    color: var(--color-text-muted);
    margin-bottom: var(--space-8);
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-primary);
    color: var(--color-white);
    font-weight: 700;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: var(--space-4) var(--space-8);
    border: 2px solid var(--color-primary);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

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

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

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

/* --- STEM Cards --- */
.stem-card {
    background-color: var(--color-white);
    border: 2px solid var(--color-border);
    padding: var(--space-8);
    transition: border-color var(--transition-fast);
}

.stem-card:hover {
    border-color: var(--color-secondary);
}

.stem-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-4);
}

.stem-category {
    font-size: 11px;
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--color-secondary);
    background-color: rgba(234,92,92,0.1);
    padding: var(--space-1) var(--space-3);
}

.stem-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: var(--space-3);
}

.stem-description {
    color: var(--color-text-muted);
    font-size: 15px;
    margin-bottom: var(--space-6);
}

.stem-features-list {
    list-style: none;
    font-size: 14px;
    color: var(--color-text-primary);
}

.stem-features-list li {
    position: relative;
    padding-left: var(--space-6);
    margin-bottom: var(--space-2);
}

.stem-features-list li::before {
    content: '▪';
    color: var(--color-primary);
    position: absolute;
    left: 0;
    top: 0;
}

/* --- Forms (Minimal Sharp Border) --- */
.inquiry-form-wrapper {
    background-color: var(--color-white);
    border: 2px solid var(--color-border);
    padding: var(--space-10);
    max-width: 650px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: var(--space-6);
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-2);
}

.form-group input,
.form-group select,
.form-group textarea {
    font-family: var(--font-family);
    font-size: 16px;
    padding: var(--space-3) var(--space-4);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-primary);
    background-color: var(--color-white);
}

/* --- Blog List Layout (index.php) --- */
.blog-grid {
    display: grid;
    gap: var(--space-8);
    grid-template-columns: 1fr;
}

@media (min-width: 768px) {
    .blog-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .blog-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.blog-card {
    background-color: var(--color-white);
    border: 2px solid var(--color-border);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.blog-card-content {
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.blog-meta {
    font-size: 13px;
    color: var(--color-text-muted);
    margin-bottom: var(--space-3);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.blog-card-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: var(--space-4);
    line-height: 1.3;
}

.blog-excerpt {
    color: var(--color-text-muted);
    font-size: 15px;
    margin-bottom: var(--space-6);
    flex-grow: 1;
}

.blog-read-more {
    font-weight: 700;
    text-transform: uppercase;
    font-size: 13px;
    letter-spacing: 0.05em;
    color: var(--color-link);
}

/* --- Single Post Layout (single.php) --- */
.single-post-wrapper {
    background-color: var(--color-white);
    border: 2px solid var(--color-border);
    padding: var(--space-10) var(--space-6);
    max-width: 800px;
    margin: 0 auto;
}

@media (min-width: 768px) {
    .single-post-wrapper {
        padding: var(--space-16) var(--space-12);
    }
}

.single-header {
    border-bottom: 2px solid var(--color-border);
    padding-bottom: var(--space-8);
    margin-bottom: var(--space-8);
}

.single-title {
    font-size: 36px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-4);
}

.post-content {
    line-height: 1.8;
    font-size: 17px;
}

.post-content p {
    margin-bottom: var(--space-6);
}

.post-content h3 {
    margin-top: var(--space-10);
    margin-bottom: var(--space-4);
}

/* --- Site Footer --- */
.site-footer {
    background-color: var(--color-white);
    border-top: 2px solid var(--color-border);
    padding-top: var(--space-16);
    padding-bottom: var(--space-12);
    font-size: var(--type-small);
}

.site-footer-grid {
    display: grid;
    gap: var(--space-10);
    grid-template-columns: 1fr;
    margin-bottom: var(--space-12);
}

@media (min-width: 768px) {
    .site-footer-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.footer-widget-title {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-primary);
    margin-bottom: var(--space-6);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--space-3);
}

.footer-links a {
    color: var(--color-text-muted);
}

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

.footer-contact-info p {
    color: var(--color-text-muted);
    margin-bottom: var(--space-3);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.footer-bottom {
    border-top: 2px solid var(--color-border);
    padding-top: var(--space-8);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    align-items: center;
    text-align: center;
}

@media (min-width: 768px) {
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
}

.footer-legal {
    color: var(--color-text-muted);
    font-size: 13px;
}

.footer-legal p {
    margin-bottom: var(--space-1);
}

.footer-copy {
    color: var(--color-text-muted);
}

/* --- Language Switcher Styling --- */
.site-language-switcher {
    display: inline-flex;
    align-items: center;
    font-size: 13px;
    font-weight: 700;
    margin-left: var(--space-4);
    border-left: 2px solid var(--color-border);
    padding-left: var(--space-4);
}

.custom-language-switcher {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.lang-link {
    color: var(--color-text-muted) !important;
    text-decoration: none;
    transition: color var(--transition-fast);
    padding: var(--space-1) var(--space-2);
    letter-spacing: 0.05em;
}

.lang-link:hover,
.lang-link.active {
    color: var(--color-secondary) !important;
}

.lang-divider {
    color: var(--color-border);
}

/* Polylang / WPML specific list support */
.pll-switcher,
.wpml-switcher {
    list-style: none;
    display: flex;
    gap: var(--space-2);
    align-items: center;
}

.pll-switcher li {
    display: inline-block;
}

.pll-switcher a,
.wpml-switcher a {
    color: var(--color-text-muted);
    text-transform: uppercase;
}

.pll-switcher a:hover,
.pll-switcher .current-lang a,
.wpml-switcher a:hover,
.wpml-switcher a.active {
    color: var(--color-secondary);
}

@media (max-width: 768px) {
    .site-language-switcher {
        margin-left: 0;
        border-left: none;
        padding-left: 0;
        margin-top: var(--space-4);
        width: 100%;
        justify-content: flex-start;
    }
}