:root {
    --blue: #0077E6;
    --blue-dark: #0052A5;
    --blue-light: #E8F2FD;
    --orange: #FF8C00;
    --orange-dark: #E67A00;
    --orange-light: #FFF4E6;
    --white: #ffffff;
    --bg: #f8fafc;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: rgba(0, 119, 230, 0.15);
    --radius: 12px;
    --shadow: 0 8px 32px rgba(0, 82, 165, 0.1);
    --font: 'Montserrat', system-ui, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: var(--font);
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--text);
    background: var(--white);
}

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

a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--orange); }

.container {
    width: min(1140px, 92vw);
    margin-inline: auto;
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.97);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(8px);
}

.header-inner {
    display: flex;
    align-items: center;
    gap: 1rem;
    min-height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    color: var(--blue-dark);
    font-weight: 800;
    flex-shrink: 0;
}

.logo .icon { color: var(--blue); flex-shrink: 0; }

.logo-text { display: flex; flex-direction: column; line-height: 1.2; }

.logo-sub {
    font-size: 0.55rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
}

.logo-name {
    font-size: 1.25rem;
    letter-spacing: 0.06em;
}

.main-nav { flex: 1; }

.main-nav ul {
    display: flex;
    justify-content: center;
    gap: 1.25rem;
    list-style: none;
    margin: 0;
    padding: 0;
    flex-wrap: wrap;
}

.main-nav a {
    color: var(--text);
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    padding: 0.35rem 0;
    border-bottom: 2px solid transparent;
    transition: color 0.2s, border-color 0.2s;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--blue);
    border-bottom-color: var(--orange);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.search-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.4rem;
    border-radius: 50%;
    transition: color 0.2s, background 0.2s;
}

.search-btn:hover { color: var(--blue); background: var(--blue-light); }

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.menu-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    transition: 0.2s;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.65rem 1.35rem;
    font-family: var(--font);
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    border-radius: 999px;
    border: 2px solid transparent;
    cursor: pointer;
    transition: transform 0.15s, background 0.2s, border-color 0.2s;
    text-decoration: none;
}

.btn:hover { transform: translateY(-1px); }

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

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

.btn-accent {
    background: var(--orange);
    color: var(--white);
    border-color: var(--orange);
}

.btn-accent:hover { background: var(--orange-dark); color: var(--white); }

.btn-outline {
    background: transparent;
    color: var(--blue);
    border-color: var(--blue);
}

.btn-outline:hover { background: var(--blue-light); }

.btn-light {
    background: var(--white);
    color: var(--blue-dark);
    border-color: var(--white);
}

.btn-light:hover { background: rgba(255, 255, 255, 0.9); color: var(--blue-dark); }

.btn-lg { padding: 0.85rem 1.75rem; font-size: 0.85rem; }
.btn-sm { padding: 0.45rem 1rem; font-size: 0.72rem; }
.btn-block { width: 100%; }

.header-cta { white-space: nowrap; }

/* Hero */
.hero {
    position: relative;
    min-height: clamp(480px, 72vh, 720px);
    display: flex;
    align-items: center;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(105deg, rgba(0, 52, 120, 0.88) 0%, rgba(0, 82, 165, 0.65) 45%, rgba(0, 82, 165, 0.25) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    padding: 4rem 0;
    max-width: 620px;
    color: var(--white);
}

.hero-eyebrow {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    opacity: 0.85;
    margin-bottom: 0.75rem;
}

.hero h1 {
    font-size: clamp(1.85rem, 4.5vw, 2.75rem);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    line-height: 1.15;
    margin: 0 0 1rem;
}

.hero-lead {
    font-size: 1rem;
    opacity: 0.92;
    margin-bottom: 1.75rem;
    max-width: 520px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.85rem;
}

.hero-actions .btn-outline {
    border-color: rgba(255, 255, 255, 0.7);
    color: var(--white);
}

.hero-actions .btn-outline:hover {
    background: rgba(255, 255, 255, 0.15);
    color: var(--white);
}

/* Trust bar */
.trust-bar {
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem 0;
}

.trust-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
}

.trust-item {
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
}

.trust-icon {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: grid;
    place-items: center;
    background: var(--blue-light);
    color: var(--blue);
    border-radius: 10px;
}

.trust-item h3 {
    font-size: 0.88rem;
    font-weight: 700;
    margin: 0 0 0.2rem;
    color: var(--blue-dark);
}

.trust-item p {
    margin: 0;
    font-size: 0.78rem;
    color: var(--text-muted);
}

/* Sections */
.section { padding: 4rem 0; }

.section-head {
    text-align: center;
    margin-bottom: 2.5rem;
}

.section-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--blue-dark);
    margin: 0 0 0.5rem;
}

.section-title.left { text-align: left; }

.section-desc {
    color: var(--text-muted);
    max-width: 560px;
    margin: 0 auto;
    font-size: 0.9rem;
}

.eeat-note {
    text-align: center;
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 2rem;
}

/* Language cards */
.languages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
}

.lang-card {
    border-radius: var(--radius);
    padding: 1.75rem 1.25rem;
    color: var(--white);
    display: flex;
    flex-direction: column;
    min-height: 320px;
    transition: transform 0.2s, box-shadow 0.2s;
    cursor: pointer;
}

.lang-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

.lang-card--blue { background: linear-gradient(160deg, var(--blue) 0%, var(--blue-dark) 100%); }
.lang-card--orange { background: linear-gradient(160deg, var(--orange) 0%, var(--orange-dark) 100%); }

.lang-card-flag { margin-bottom: 1rem; }

.flag-icon { border-radius: 50%; box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15); }

.lang-card h3 {
    font-size: 1.1rem;
    font-weight: 800;
    text-transform: uppercase;
    margin: 0 0 0.35rem;
}

.lang-subtitle {
    font-size: 0.82rem;
    opacity: 0.9;
    margin: 0 0 0.5rem;
}

.lang-meta {
    font-size: 0.78rem;
    font-weight: 600;
    opacity: 0.85;
    margin: 0 0 0.75rem;
}

.lang-text {
    font-size: 0.82rem;
    opacity: 0.9;
    flex: 1;
    margin: 0 0 1.25rem;
}

/* Teachers */
.teachers-section { background: var(--bg); }

.teachers-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
}

.teacher-card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.teacher-photo {
    position: relative;
    aspect-ratio: 280 / 240;
    overflow: hidden;
}

.teacher-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.teacher-flag {
    position: absolute;
    bottom: 0.75rem;
    right: 0.75rem;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.teacher-body { padding: 1.25rem; }

.teacher-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin: 0 0 0.35rem;
    color: var(--blue-dark);
}

.teacher-lang {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin: 0 0 0.25rem;
}

.teacher-role {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--orange);
    margin: 0 0 0.5rem;
}

.teacher-bio {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin: 0 0 0.75rem;
}

.teacher-credentials {
    list-style: none;
    margin: 0;
    padding: 0;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.teacher-credentials li {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    margin-bottom: 0.25rem;
}

.teacher-credentials .icon { color: var(--blue); flex-shrink: 0; }

/* Quiz */
.quiz-section { background: var(--blue-light); }

.quiz-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    max-width: 720px;
    margin: 0 auto;
}

.quiz-progress { margin-bottom: 1.5rem; }

.quiz-progress-bar {
    height: 6px;
    background: linear-gradient(90deg, var(--blue), var(--orange));
    border-radius: 999px;
    transition: width 0.3s;
    margin-bottom: 0.5rem;
}

.quiz-step-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
}

.quiz-step { display: none; }
.quiz-step.active { display: block; }

.quiz-step h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--blue-dark);
    margin: 0 0 1.25rem;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.quiz-options label {
    display: flex;
    align-items: flex-start;
    gap: 0.65rem;
    padding: 0.85rem 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.88rem;
    transition: border-color 0.2s, background 0.2s;
}

.quiz-options label:hover { border-color: var(--blue); background: var(--blue-light); }

.quiz-options label:has(input:checked) {
    border-color: var(--blue);
    background: var(--blue-light);
}

.quiz-options input { margin-top: 0.2rem; accent-color: var(--blue); }

.quiz-result-level,
.quiz-result-format {
    font-weight: 700;
    color: var(--orange);
    margin: 0.5rem 0;
}

.quiz-nav {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

/* Calculator */
.calculator-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    align-items: start;
}

.calculator-intro p {
    color: var(--text-muted);
    margin-bottom: 1.25rem;
}

.calc-notes {
    list-style: none;
    margin: 0;
    padding: 0;
}

.calc-notes li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.88rem;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
}

.calc-notes .icon { color: var(--blue); }

.calculator-form {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.75rem;
}

.calculator-form label {
    display: block;
    margin-bottom: 1rem;
}

.calculator-form label > span {
    display: block;
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--text-muted);
    margin-bottom: 0.35rem;
}

.calculator-form input,
.calculator-form select,
.signup-form input,
.signup-form select,
.signup-form textarea {
    width: 100%;
    padding: 0.65rem 0.85rem;
    font-family: var(--font);
    font-size: 0.9rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--white);
    color: var(--text);
}

.calculator-form input:focus,
.calculator-form select:focus,
.signup-form input:focus,
.signup-form select:focus,
.signup-form textarea:focus {
    outline: 2px solid var(--blue);
    outline-offset: 1px;
}

.calc-options {
    border: none;
    margin: 0 0 1rem;
    padding: 0;
}

.calc-options legend {
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.88rem;
    cursor: pointer;
    margin-bottom: 0.5rem;
}

.checkbox-label input { width: auto; accent-color: var(--blue); }

.calc-result {
    background: var(--white);
    border: 2px solid var(--blue);
    border-radius: var(--radius);
    padding: 1.25rem;
    margin: 1rem 0;
    text-align: center;
}

.calc-result-label {
    display: block;
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.calc-result-value {
    display: block;
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--blue-dark);
}

.calc-result-per {
    display: block;
    font-size: 0.8rem;
    color: var(--orange);
    margin-top: 0.25rem;
}

.calc-disclaimer {
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

/* Schedule */
.schedule-section { background: var(--bg); }

.schedule-wrap {
    overflow-x: auto;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--white);
}

.schedule-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.schedule-table th,
.schedule-table td {
    padding: 0.85rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.schedule-table th {
    background: var(--blue-dark);
    color: var(--white);
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.schedule-table tbody tr:hover { background: var(--blue-light); }

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

/* Reviews */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
}

.review-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.stars {
    display: flex;
    gap: 2px;
    color: var(--orange);
    margin-bottom: 0.75rem;
}

.review-card blockquote {
    margin: 0 0 1rem;
    font-size: 0.88rem;
    color: var(--text);
}

.review-card blockquote p { margin: 0; }

.review-card footer {
    font-size: 0.82rem;
}

.review-card footer strong {
    display: block;
    color: var(--blue-dark);
}

.review-card footer span { color: var(--text-muted); }

/* FAQ */
.faq-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 2.5rem;
    align-items: start;
}

.faq-intro {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.faq-list { display: flex; flex-direction: column; gap: 0.5rem; }

.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--white);
    overflow: hidden;
}

.faq-item summary {
    padding: 1rem 1.25rem;
    font-weight: 600;
    cursor: pointer;
    color: var(--blue-dark);
    list-style: none;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
    content: '+';
    float: right;
    color: var(--orange);
    font-weight: 700;
}

.faq-item[open] summary::after { content: '−'; }

.faq-item p {
    padding: 0 1.25rem 1rem;
    margin: 0;
    font-size: 0.88rem;
    color: var(--text-muted);
}

/* Signup */
.signup-section {
    background: linear-gradient(135deg, var(--blue-dark) 0%, var(--blue) 100%);
    padding: 4rem 0;
    color: var(--white);
}

.signup-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    align-items: start;
}

.signup-info h2 {
    font-size: 1.75rem;
    font-weight: 800;
    text-transform: uppercase;
    margin: 0 0 0.75rem;
}

.signup-info p { opacity: 0.9; margin-bottom: 1.25rem; }

.signup-perks {
    list-style: none;
    margin: 0;
    padding: 0;
}

.signup-perks li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.88rem;
    opacity: 0.92;
}

.signup-perks .icon { color: var(--orange); }

.signup-form {
    background: var(--white);
    border-radius: var(--radius);
    padding: 1.75rem;
    color: var(--text);
}

.signup-form label {
    display: block;
    margin-bottom: 0.85rem;
}

.signup-form label > span {
    display: block;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.3rem;
}

.signup-form textarea { resize: vertical; min-height: 72px; }

/* Footer */
.site-footer {
    background: #eef2f7;
    color: var(--text);
    padding: 3rem 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr 0.8fr 1fr;
    gap: 2rem;
}

.logo-footer {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--blue-dark);
    letter-spacing: 0.06em;
}

.footer-brand p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin: 0.5rem 0 1rem;
}

.footer-brand .icon { color: var(--blue); opacity: 0.6; }

.footer-links h4,
.footer-contacts h4 {
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--blue-dark);
    margin: 0 0 0.75rem;
}

.footer-links ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-links li { margin-bottom: 0.35rem; }

.footer-links a {
    font-size: 0.85rem;
    color: var(--text-muted);
}

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

.footer-contacts p {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin: 0 0 0.4rem;
}

.footer-contacts a { color: var(--blue); }

.social-links {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--blue);
    color: var(--white);
    border-radius: 8px;
    font-size: 0.7rem;
    font-weight: 700;
}

.social-links a:hover { background: var(--orange); color: var(--white); }

.footer-bottom {
    border-top: 1px solid var(--border);
    padding: 1rem 0;
    margin-top: 2rem;
}

.footer-bottom .container {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.78rem;
    color: var(--text-muted);
}

.footer-bottom p { margin: 0; }

/* Toast */
.toast {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    background: var(--blue-dark);
    color: var(--white);
    padding: 0.85rem 1.25rem;
    border-radius: var(--radius);
    font-size: 0.88rem;
    font-weight: 500;
    box-shadow: var(--shadow);
    transform: translateY(120%);
    opacity: 0;
    transition: transform 0.3s, opacity 0.3s;
    z-index: 200;
    max-width: 360px;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

/* Responsive */
@media (max-width: 1024px) {
    .languages-grid,
    .teachers-grid { grid-template-columns: repeat(2, 1fr); }
    .trust-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .menu-toggle { display: flex; }
    .header-actions .header-cta { display: none; }

    .main-nav {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--white);
        border-bottom: 1px solid var(--border);
        padding: 1rem;
        transform: translateY(-120%);
        opacity: 0;
        pointer-events: none;
        transition: transform 0.25s, opacity 0.25s;
    }

    .main-nav.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .main-nav ul { flex-direction: column; align-items: center; }

    .languages-grid,
    .teachers-grid,
    .reviews-grid,
    .calculator-grid,
    .faq-grid,
    .signup-grid,
    .trust-grid { grid-template-columns: 1fr; }

    .schedule-table thead { display: none; }

    .schedule-table tr {
        display: block;
        margin-bottom: 1rem;
        border: 1px solid var(--border);
        border-radius: var(--radius);
        padding: 0.5rem;
    }

    .schedule-table td {
        display: flex;
        justify-content: space-between;
        border: none;
        padding: 0.4rem 0.5rem;
    }

    .schedule-table td::before {
        content: attr(data-label);
        font-weight: 600;
        color: var(--blue-dark);
        margin-right: 1rem;
    }

    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom .container { flex-direction: column; }
}