/**
 * Main Stylesheet for English Language Courses Website
 */

@import url('variables.css');

/* Font imports */
@import url('https://api.fontshare.com/v2/css?f[]=satoshi@900,700,500,400&f[]=cabinet-grotesk@800,700,500,400&display=swap');

/* 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-secondary);
    font-weight: 400;
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-dark);
    background-color: var(--color-white);
    overflow-x: hidden;
}

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

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-normal);
}

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

button, .btn {
    cursor: pointer;
    font-family: inherit;
    border: none;
    background: none;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    font-weight: 700;
    line-height: var(--line-height-tight);
    margin-bottom: 0.5em;
}

h1 {
    font-size: var(--font-size-4xl);
    font-weight: 800;
}

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-bottom: 1em;
}

/* Layout */
.container {
    width: 100%;
    max-width: var(--container-xl);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-4);
    padding-right: var(--space-4);
}

.section {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
    position: relative;
}

.section--with-skew {
    position: relative;
    z-index: 1;
}

.section--with-skew::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-dark-10);
    transform: skewY(-3deg);
    transform-origin: top left;
    z-index: -1;
}

/* Grid System */
.grid {
    display: grid;
    gap: var(--grid-gap);
}

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

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

.grid-4 {
    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);
    }
    
    .grid-4 {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Header */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--color-white);
    z-index: var(--z-fixed);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal);
}

.site-header--hidden {
    transform: translateY(-100%);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.site-logo {
    font-family: var(--font-primary);
    font-weight: 800;
    font-size: var(--font-size-lg);
    color: var(--color-dark);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.site-logo svg {
    width: 40px;
    height: 40px;
}

.primary-nav {
    display: none;
}

.primary-nav ul {
    display: flex;
    list-style: none;
    gap: var(--space-8);
}

.primary-nav a {
    color: var(--color-dark);
    font-weight: 500;
    position: relative;
}

.primary-nav a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width var(--transition-normal);
}

.primary-nav a:hover::after,
.primary-nav a.active::after {
    width: 100%;
}

/* Language Switcher */
.language-switcher {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-left: var(--space-6);
}

.language-option {
    font-weight: 500;
    font-size: var(--font-size-sm);
    color: var(--color-dark-60);
    text-transform: uppercase;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    padding: var(--space-1) var(--space-2);
}

.language-option.active {
    color: var(--color-primary);
    font-weight: 700;
}

.language-option:hover:not(.active) {
    color: var(--color-dark);
}

.language-option::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--color-primary);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.language-option.active::after {
    opacity: 1;
}

/* Mobile Menu */
.menu-toggle {
    width: 32px;
    height: 32px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    cursor: pointer;
    padding: 6px;
}

.menu-toggle span {
    display: block;
    height: 2px;
    width: 100%;
    background-color: var(--color-dark);
    transition: all var(--transition-normal);
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

.mobile-menu {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    height: calc(100vh - 80px);
    background-color: var(--color-white);
    padding: var(--space-8);
    transform: translateX(100%);
    transition: transform var(--transition-normal);
    overflow-y: auto;
    z-index: var(--z-fixed);
}

.mobile-menu.active {
    transform: translateX(0);
}

.mobile-menu ul {
    list-style: none;
    margin-bottom: var(--space-8);
}

.mobile-menu li {
    margin-bottom: var(--space-4);
}

.mobile-menu a {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-dark);
    display: block;
    padding: var(--space-2) 0;
}

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

.mobile-menu-language {
    display: flex;
    gap: var(--space-4);
    margin-top: var(--space-8);
}

.mobile-menu-language .language-option {
    font-size: var(--font-size-base);
}

/* Main Content Area */
main {
    padding-top: 80px; /* Header height */
}

/* Hero Section */
.hero {
    min-height: calc(100vh - 80px);
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: -30%;
    width: 80%;
    height: 100%;
    background-color: var(--color-primary);
    border-radius: 0 0 0 50%;
    opacity: 0.05;
    z-index: -1;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -10%;
    left: -10%;
    width: 40%;
    height: 70%;
    background-color: var(--color-accent);
    border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
    opacity: 0.1;
    z-index: -1;
}

.hero-content {
    max-width: 650px;
}

.hero-subtitle {
    font-family: var(--font-primary);
    font-size: var(--font-size-lg);
    color: var(--color-primary);
    margin-bottom: var(--space-4);
    opacity: 0.9;
}

.hero-title {
    margin-bottom: var(--space-6);
}

.hero-description {
    font-size: var(--font-size-md);
    color: var(--color-dark-80);
    margin-bottom: var(--space-8);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4) var(--space-8);
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-align: center;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 120%;
    height: 0;
    padding-bottom: 120%;
    border-radius: 50%;
    transform: translate(-50%, -50%) scale(0);
    opacity: 0;
    transition: transform 0.5s, opacity 0.3s;
    background-color: rgba(255, 255, 255, 0.1);
}

.btn:hover::after,
.btn:focus::after {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--color-white);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-lg {
    padding: var(--space-5) var(--space-10);
    font-size: var(--font-size-md);
}

.btn-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
}

/* Feature Cards */
.feature-card {
    padding: var(--space-8);
    border-radius: var(--radius-2xl);
    background-color: var(--color-white);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    height: 100%;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background-color: var(--color-primary);
    z-index: -1;
    transition: width var(--transition-slow);
}

.feature-card:hover::before {
    width: 100%;
    opacity: 0.05;
}

.feature-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-6);
    color: var(--color-primary);
    position: relative;
}

.feature-icon::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-primary);
    opacity: 0.1;
    border-radius: var(--radius-lg);
    transform: rotate(-10deg);
}

.feature-icon svg {
    width: 32px;
    height: 32px;
    position: relative;
    z-index: 1;
}

.feature-title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-4);
}

.feature-description {
    color: var(--color-dark-80);
}

/* Testimonial */
.testimonial {
    text-align: center;
    padding: var(--space-10);
    position: relative;
}

.testimonial-quote {
    font-size: var(--font-size-xl);
    font-style: italic;
    color: var(--color-dark);
    margin-bottom: var(--space-6);
    position: relative;
}

.testimonial-quote::before,
.testimonial-quote::after {
    content: '"';
    font-family: Georgia, serif;
    font-size: 5rem;
    color: var(--color-primary);
    opacity: 0.2;
    position: absolute;
}

.testimonial-quote::before {
    top: -2rem;
    left: -1rem;
}

.testimonial-quote::after {
    bottom: -4rem;
    right: -1rem;
    transform: rotate(180deg);
}

.testimonial-author {
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: var(--space-2);
}

.testimonial-role {
    color: var(--color-dark-60);
    font-size: var(--font-size-sm);
}

/* Pricing */
.pricing-card {
    padding: var(--space-8);
    border-radius: var(--radius-2xl);
    background-color: var(--color-white);
    box-shadow: var(--shadow-lg);
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: transform var(--transition-normal);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.pricing-card--popular {
    border: 2px solid var(--color-primary);
    transform: scale(1.05);
}

.pricing-card--popular::before {
    content: 'Najpopularniejszy';
    position: absolute;
    top: 16px;
    right: -32px;
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: 4px 40px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    transform: rotate(45deg);
}

[lang="en"] .pricing-card--popular::before {
    content: 'Most Popular';
}

.pricing-card:hover:not(.pricing-card--popular) {
    transform: translateY(-8px);
}

.pricing-title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-2);
}

.pricing-price {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: var(--space-4);
}

.pricing-period {
    font-size: var(--font-size-sm);
    color: var(--color-dark-60);
    display: block;
}

.pricing-features {
    list-style: none;
    margin: var(--space-6) 0;
    flex-grow: 1;
}

.pricing-features li {
    padding: var(--space-2) 0;
    border-bottom: 1px solid var(--color-dark-20);
}

.pricing-features li:last-child {
    border-bottom: none;
}

/* FAQ Accordion */
.accordion-item {
    border-bottom: 1px solid var(--color-dark-20);
}

.accordion-toggle {
    width: 100%;
    text-align: left;
    padding: var(--space-6) 0;
    position: relative;
    font-weight: 600;
    font-size: var(--font-size-md);
    color: var(--color-dark);
    transition: color var(--transition-normal);
}

.accordion-toggle:hover {
    color: var(--color-primary);
}

.accordion-toggle::after {
    content: '+';
    position: absolute;
    right: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    font-size: var(--font-size-xl);
    transition: transform var(--transition-normal);
}

.accordion-toggle[aria-expanded="true"]::after {
    transform: translateY(-50%) rotate(45deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
    padding-right: var(--space-8);
}

.accordion-item.active .accordion-content {
    max-height: 500px;
    padding-bottom: var(--space-6);
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--grid-gap);
}

.stat-item {
    text-align: center;
    padding: var(--space-6);
}

.stat-number {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: var(--space-2);
}

.stat-label {
    font-size: var(--font-size-md);
    color: var(--color-dark-80);
}

/* Contact Form */
.contact-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: var(--space-6);
}

.form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: var(--space-4);
    border: 2px solid var(--color-dark-20);
    border-radius: var(--radius-lg);
    font-family: inherit;
    font-size: var(--font-size-base);
    transition: all var(--transition-normal);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 93, 245, 0.1);
}

textarea.form-control {
    min-height: 150px;
    resize: vertical;
}

/* Footer */
.site-footer {
    background-color: var(--color-dark);
    color: var(--color-white);
    padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--grid-gap);
}

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

.footer-brand {
    margin-bottom: var(--space-6);
}

.footer-logo {
    font-family: var(--font-primary);
    font-weight: 800;
    font-size: var(--font-size-xl);
    color: var(--color-white);
    margin-bottom: var(--space-4);
    display: inline-block;
}

.footer-description {
    color: var(--color-dark-40);
    margin-bottom: var(--space-6);
}

.footer-heading {
    font-size: var(--font-size-md);
    margin-bottom: var(--space-6);
    color: var(--color-white);
}

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

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

.footer-nav a {
    color: var(--color-dark-40);
    transition: color var(--transition-normal);
}

.footer-nav a:hover {
    color: var(--color-white);
}

.footer-contact-item {
    display: flex;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
    color: var(--color-dark-40);
}

.footer-contact-item svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--space-8);
    margin-top: var(--space-8);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

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

.footer-copyright {
    color: var(--color-dark-40);
    font-size: var(--font-size-sm);
}

.footer-links {
    display: flex;
    gap: var(--space-6);
}

.footer-links a {
    color: var(--color-dark-40);
    font-size: var(--font-size-sm);
    transition: color var(--transition-normal);
}

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

/* Animation Classes */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

.animate-delay-1 { transition-delay: 0.1s; }
.animate-delay-2 { transition-delay: 0.2s; }
.animate-delay-3 { transition-delay: 0.3s; }
.animate-delay-4 { transition-delay: 0.4s; }
.animate-delay-5 { transition-delay: 0.5s; }

/* Media Queries */
@media (min-width: 768px) {
    .primary-nav {
        display: block;
    }
    
    .menu-toggle {
        display: none;
    }
}

@media (min-width: 1024px) {
    .section {
        padding-top: var(--space-24);
        padding-bottom: var(--space-24);
    }
    
    .hero {
        min-height: 90vh;
    }
}