/* course-intro.css – estilo do modal de introdução (sem vídeo) */
.course-intro-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.75);
    z-index: 2200;
    justify-content: center;
    align-items: center;
    padding: 1rem;
    opacity: 0;
    transition: opacity 0.2s ease;
}
.course-intro-modal.show {
    opacity: 1;
}
.intro-modal-content {
    background: var(--bg-secondary, #161B22);
    border-radius: 20px;
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    transform: scale(0.95);
    transition: transform 0.2s ease;
}
.course-intro-modal.show .intro-modal-content {
    transform: scale(1);
}
.intro-logo-large {
    display: block;
    margin: 0 auto 20px auto;
    max-width: 700px;
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    background: var(--bg-primary, #0D1117);
    padding: 1rem;
    border-top-left-radius: 20px;
    border-top-right-radius: 20px;
}
#introContent {
    padding: 0 1rem 1rem 1rem;
    overflow-y: auto;
    flex: 1;
    color: var(--text-primary, #E6EDF3);
    line-height: 1.6;
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
    scrollbar-width: thin;
}
#introContent::-webkit-scrollbar {
    width: 8px;
}
#introContent::-webkit-scrollbar-track {
    background: var(--bg-tertiary, #1F2933);
    border-radius: 4px;
}
#introContent::-webkit-scrollbar-thumb {
    background: var(--accent-blue, #2563EB);
    border-radius: 4px;
}
#introContent h1 {
    font-size: 1.8rem;
    font-weight: 700;
    margin: 1rem 0 0.5rem;
    color: var(--accent-blue, #58a6ff);
    border-bottom: 2px solid var(--border, #2D3748);
    padding-bottom: 0.5rem;
}
#introContent h2 {
    font-size: 1.4rem;
    font-weight: 600;
    margin: 1.2rem 0 0.6rem;
    color: var(--accent-blue, #58a6ff);
}
#introContent h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 1rem 0 0.5rem;
    color: var(--text-primary, #E6EDF3);
}
#introContent p {
    margin-bottom: 1rem;
    line-height: 1.6;
}
#introContent ul, #introContent ol {
    margin: 0.5rem 0 1rem 1.5rem;
}
#introContent li {
    margin-bottom: 0.4rem;
    line-height: 1.5;
}
#introContent a {
    color: var(--accent-blue, #58a6ff);
    text-decoration: none;
    border-bottom: 1px dotted transparent;
    transition: border-color 0.2s;
}
#introContent a:hover {
    text-decoration: underline;
    border-bottom-color: currentColor;
}
#introContent strong {
    color: var(--accent-green, #22C55E);
}
.social-icons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin: 0 0 1rem 0;
    padding: 0 1rem;
}
.social-icons a {
    background: var(--bg-tertiary, #1F2933);
    padding: 0.6rem 1.2rem;
    border-radius: 2rem;
    font-size: 0.9rem;
    transition: 0.2s;
    color: var(--text-primary, #E6EDF3);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}
.social-icons a:hover {
    background: var(--accent-blue, #2563EB);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}
.intro-footer {
    padding: 1rem;
    border-top: 1px solid var(--border, #2D3748);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}
.dont-show-again {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary, #9CA3AF);
}
.dont-show-again input {
    cursor: pointer;
    width: 16px;
    height: 16px;
}
.start-lesson-btn {
    background: var(--accent-blue, #2563EB);
    border: none;
    color: white;
    padding: 0.6rem 1.4rem;
    border-radius: 2rem;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}
.start-lesson-btn:hover {
    background: var(--accent-blue-hover, #1D4ED8);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}
.close-intro {
    position: absolute;
    top: 12px;
    right: 12px;
    background: rgba(0, 0, 0, 0.6);
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: #fff;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}
.close-intro:hover {
    background: rgba(0, 0, 0, 0.9);
}
@media (max-width: 600px) {
    .intro-modal-content {
        max-width: 95%;
        max-height: 85vh;
    }
    .intro-logo-large {
        max-width: 100%;
    }
    .social-icons {
        flex-wrap: wrap;
        gap: 0.8rem;
    }
    .social-icons a {
        padding: 0.4rem 1rem;
        font-size: 0.8rem;
    }
    .intro-footer {
        flex-direction: column;
        align-items: stretch;
    }
    .dont-show-again {
        justify-content: center;
    }
    .start-lesson-btn {
        text-align: center;
    }
    #introContent h1 {
        font-size: 1.5rem;
    }
    #introContent h2 {
        font-size: 1.2rem;
    }
}