* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg: #0f1420;
    --surface: #171e2e;
    --surface-2: #1f2940;
    --text: #e8ecf4;
    --muted: #9aa7bd;
    --accent: #ffb454;
    --radius: 14px;
}

body {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: min(1100px, 92%);
    margin: 0 auto;
}

.site-header {
    background: var(--surface);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    padding: 16px 0;
}

.contact-bar {
    width: min(1100px, 92%);
    margin: 14px auto 0;
    padding-top: 12px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    color: var(--muted);
    font-size: 0.9rem;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.brand {
    font-size: 1.35rem;
    font-weight: 700;
    color: #0066a1;
    text-decoration: none;
    letter-spacing: 0.5px;
}

.main-nav {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.main-nav a {
    color: var(--muted);
    text-decoration: none;
    padding: 8px 14px;
    border-radius: 999px;
    font-size: 0.95rem;
    transition: background 0.15s, color 0.15s;
}

.main-nav a:hover {
    color: var(--text);
    background: var(--surface-2);
}

.main-nav a.active {
    color: var(--bg);
    background: var(--accent);
    font-weight: 600;
}

.flag-link {
    font-size: 1.3rem;
    line-height: 1;
}

main {
    flex: 1;
    padding: 48px 0;
}

h1 {
    color: #1f6feb;
}

.hero {
    text-align: center;
    padding: 24px 0 40px;
}

.hero h1 {
    font-size: clamp(1.9rem, 4vw, 3rem);
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.hero p {
    color: var(--muted);
    font-size: 1.15rem;
    max-width: 640px;
    margin: 0 auto;
}

.course-index {
    text-align: center;
    padding-top: 24px;
}

.teacher-block {
    text-align: center;
    padding-top: 34px;
}

.teacher-name {
    font-family: "Playfair Display", Georgia, "Times New Roman", serif;
    font-size: 1.6rem;
    font-weight: 600;
    color: var(--text);
}

.teacher-line {
    color: var(--muted);
    font-size: 1.05rem;
    margin-top: 4px;
}

.course-index p {
    color: var(--accent);
    font-size: 1.1rem;
    margin-bottom: 10px;
}

.course-index ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.course-index a {
    display: inline-block;
    color: var(--text);
    background: var(--surface);
    border: 1px solid rgba(255, 255, 255, 0.07);
    border-radius: var(--radius);
    padding: 8px 16px;
    font-size: 0.95rem;
    text-decoration: none;
    transition: border-color 0.15s, color 0.15s, background 0.15s;
}

.course-index a:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--surface-2);
}

.course-grid {
    display: flex;
    flex-direction: column;
    gap: 18px;
    margin-top: 24px;
    width: min(720px, 100%);
    margin-left: auto;
    margin-right: auto;
}

.lang-list {
    width: min(560px, 100%);
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.lang-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 18px;
    background: var(--surface);
    border: 1px solid rgba(255, 255, 255, 0.07);
    border-radius: var(--radius);
    padding: 22px 28px;
    text-decoration: none;
    color: var(--text);
    font-weight: 600;
    transition: border-color 0.15s, transform 0.15s;
}

.lang-item:hover {
    border-color: var(--accent);
    transform: translateX(4px);
}

.lang-item .flag {
    font-size: 2.6rem;
}

.lang-item .lang-name {
    font-family: "Playfair Display", Georgia, "Times New Roman", serif;
    font-size: 1.9rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.course-card {
    background: var(--surface);
    border: 1px solid rgba(255, 255, 255, 0.07);
    border-radius: var(--radius);
    padding: 0 28px;
    color: var(--text);
}

.course-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    padding: 22px 0;
}

.course-row .flag {
    font-size: 2.2rem;
}

.course-row .course-line {
    display: inline-flex;
    align-items: center;
    gap: 12px;
}

.course-row.stack {
    flex-direction: column;
    align-items: flex-start;
}

.course-row.lang-row {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
}

.course-row.lang-row .course-sep {
    color: var(--muted);
    font-size: 1.4rem;
}

.course-row .course-name {
    font-family: "Playfair Display", Georgia, "Times New Roman", serif;
    font-size: 1.4rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.course-row:not(.stack) .course-name {
    flex: 1 1 100%;
}

.course-card-title {
    font-family: "Playfair Display", Georgia, "Times New Roman", serif;
    font-size: 1.6rem;
    font-weight: 600;
    color: var(--accent);
    padding-bottom: 4px;
}

.course-desc {
    color: var(--muted);
    font-size: 0.95rem;
    border-top: 1px dashed rgba(255, 255, 255, 0.1);
    padding-top: 18px;
    margin-top: 6px;
}

.course-duration {
    font-weight: 700;
    font-size: 1rem;
    margin-top: 8px;
}

.course-price {
    font-weight: 700;
    font-size: 1.1rem;
    color: #1f6feb;
    margin-top: 6px;
}

.course-cta {
    margin-top: 10px;
    font-size: 1rem;
    color: var(--text);
}

.course-link-center {
    text-align: center;
    margin: 14px 0;
}

.course-link-center a {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--accent);
    text-decoration: none;
}

.course-cta a {
    color: var(--accent);
    font-weight: 600;
    text-decoration: none;
    border-bottom: 1px solid rgba(255, 180, 84, 0.4);
    margin-right: 14px;
}

.course-cta a:hover {
    border-bottom-color: var(--accent);
}

.site-footer {
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding: 20px 0;
    color: var(--muted);
    font-size: 0.9rem;
}

.btn {
    display: inline-block;
    background: var(--accent);
    color: var(--bg);
    font-weight: 600;
    text-decoration: none;
    padding: 10px 22px;
    border-radius: 999px;
}

@media (max-width: 640px) {
    main {
        padding: 28px 0;
    }
}