.lesson-page-note {
    margin-top: 0.7rem;
    border-radius: 0.9rem;
    border: 1px solid rgba(56, 189, 248, 0.38);
    padding: 0.7rem 0.85rem;
    font-size: 0.82rem;
    color: var(--text-soft);
    background:
        radial-gradient(circle at 0 0, rgba(56, 189, 248, 0.12), transparent 58%),
        linear-gradient(180deg, rgba(255, 255, 255, 0.88), rgba(255, 255, 255, 0.64));
    box-shadow: var(--shadow-soft);
}

body.theme-dark .lesson-page-note {
    background:
        radial-gradient(circle at 0 0, rgba(56, 189, 248, 0.18), transparent 58%),
        linear-gradient(180deg, rgba(15, 23, 42, 0.84), rgba(15, 23, 42, 0.68));
}

.lesson-page-note strong {
    color: var(--text-main);
}

.lesson-code-card,
.basics-code,
.projects-code {
    overflow: hidden;
}

.lesson-code-card {
    margin-top: 0.45rem;
    border-radius: 0.78rem;
    border: 1px solid rgba(148, 163, 184, 0.24);
    background: var(--card);
    box-shadow: var(--shadow-soft);
}

.lesson-code-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.6rem;
    padding: 0.46rem 0.72rem;
    border-bottom: 1px solid rgba(148, 163, 184, 0.28);
    background:
        radial-gradient(circle at 0 0, rgba(56, 189, 248, 0.16), transparent 58%),
        rgba(255, 255, 255, 0.36);
}

body.theme-dark .lesson-code-toolbar {
    background:
        radial-gradient(circle at 0 0, rgba(56, 189, 248, 0.22), transparent 58%),
        rgba(15, 23, 42, 0.32);
}

.lesson-code-title {
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-soft);
    font-weight: 700;
}

.lesson-copy-btn {
    font-size: 0.74rem;
    padding: 0.24rem 0.72rem;
    border-radius: 999px;
    border: 1px solid rgba(148, 163, 184, 0.9);
    background: rgba(15, 23, 42, 0.02);
    color: var(--text-main);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.12s ease, box-shadow 0.12s ease, border-color 0.12s ease, background 0.12s ease, color 0.12s ease;
    white-space: nowrap;
}

.lesson-copy-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgba(15, 23, 42, 0.15);
    border-color: var(--accent);
    background: rgba(15, 23, 42, 0.04);
}

.lesson-copy-btn:disabled {
    cursor: default;
}

.lesson-copy-btn.is-copied {
    border-color: rgba(34, 197, 94, 0.9);
    background: rgba(34, 197, 94, 0.12);
    color: #15803d;
}

body.theme-dark .lesson-copy-btn.is-copied {
    color: #86efac;
}

.lesson-copy-btn.is-error {
    border-color: rgba(239, 68, 68, 0.9);
    background: rgba(239, 68, 68, 0.12);
    color: #b91c1c;
}

body.theme-dark .lesson-copy-btn.is-error {
    color: #fca5a5;
}

.lesson-code-card pre,
.basics-code pre,
.projects-code pre {
    margin: 0;
    padding: 0.72rem 0.82rem 0.8rem;
    border: 0;
    border-radius: 0;
    background: transparent;
    overflow-x: auto;
}

.lesson-code-card pre code,
.basics-code pre code,
.projects-code pre code {
    display: block;
    white-space: pre;
}

.lesson-copy-toast {
    position: fixed;
    z-index: 40;
    bottom: 1.1rem;
    right: 0.9rem;
    padding: 0.38rem 0.92rem;
    border-radius: 999px;
    background: rgba(34, 197, 94, 0.95);
    color: #fff;
    font-size: 0.78rem;
    box-shadow: 0 10px 25px rgba(22, 163, 74, 0.6);
    opacity: 0;
    transform: translateY(10px);
    pointer-events: none;
    transition: opacity 0.18s ease, transform 0.18s ease;
}

.lesson-copy-toast.visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 560px) {
    .lesson-code-toolbar {
        flex-wrap: wrap;
    }
}