/* =========================================================
   PYTHON LESSON SLIDESHOW
   ========================================================= */

.lesson-container {
    position: relative;
    width: 100%;
    font-family: 'Roboto', sans-serif;
}


/* ---------------------------------------------------------
   TOOLBAR
   --------------------------------------------------------- */

.lesson-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;

    gap: 1rem;

    margin-bottom: 1rem;
    padding: 0.75rem 1rem;

    background: #ffffff;

    border: 1px solid #dee2e6;
    border-radius: 8px;

    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.lesson-toolbar-left,
.lesson-toolbar-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lesson-toolbar-center {
    flex: 1;
    text-align: center;
}

.lesson-current-title {
    font-weight: 500;
    color: #495057;
}

.lesson-counter {
    font-weight: 600;
    white-space: nowrap;
}


/* ---------------------------------------------------------
   SOURCE MARKDOWN
   --------------------------------------------------------- */

.lesson-source {
    display: none;
}


/* ---------------------------------------------------------
   SLIDESHOW
   --------------------------------------------------------- */

.lesson-slideshow {
    position: relative;

    width: 100%;

    background: #ffffff;

    border: 1px solid #dee2e6;
    border-radius: 10px;

    overflow: hidden;

    min-height: 500px;

    box-shadow:
        0 4px 12px rgba(0, 0, 0, 0.08);
}

.lesson-slides {
    width: 100%;
    height: 100%;
}


/* ---------------------------------------------------------
   SINGLE SLIDE
   --------------------------------------------------------- */

.lesson-slide {
    display: none;

    width: 100%;
    min-height: 500px;

    padding: 3rem 4rem;

    overflow-y: auto;

    animation: lessonSlideIn 0.2s ease;
}

.lesson-slide.active {
    display: block;
}

.lesson-slide h1 {
    margin-bottom: 2rem;

    font-size: clamp(2rem, 4vw, 3rem);

    font-weight: 700;

    color: #212529;
}

.lesson-slide h2 {
    margin-top: 0;
    margin-bottom: 1.5rem;

    font-size: clamp(1.6rem, 3vw, 2.3rem);

    font-weight: 600;

    color: #0d6efd;
}

.lesson-slide h3 {
    margin-top: 1.5rem;
    margin-bottom: 1rem;

    font-size: 1.5rem;
}

.lesson-slide p,
.lesson-slide li {
    font-size: 1.15rem;
    line-height: 1.75;
}

.lesson-slide ul,
.lesson-slide ol {
    margin-bottom: 1.5rem;
}


/* ---------------------------------------------------------
   CODE
   --------------------------------------------------------- */

.lesson-slide pre {
    margin: 1.5rem 0;

    padding: 1.25rem;

    background: #1e1e1e;

    border-radius: 8px;

    overflow-x: auto;

    font-family:
        Consolas,
        Monaco,
        'Courier New',
        monospace;

    font-size: 0.95rem;

    line-height: 1.55;
}

.lesson-slide pre code {
    background: transparent;
}


/* ---------------------------------------------------------
   INLINE CODE
   --------------------------------------------------------- */

.lesson-slide :not(pre)>code {
    padding: 0.15rem 0.4rem;

    border-radius: 4px;

    background: #f1f3f5;

    color: #c7254e;

    font-family:
        Consolas,
        Monaco,
        monospace;
}


/* ---------------------------------------------------------
   HORIZONTAL RULE
   --------------------------------------------------------- */

.lesson-slide hr {
    margin: 2rem 0;

    border: 0;

    border-top: 1px solid #dee2e6;
}


/* ---------------------------------------------------------
   BLOCKQUOTE
   --------------------------------------------------------- */

.lesson-slide blockquote {
    margin: 1.5rem 0;

    padding: 1rem 1.5rem;

    border-left: 5px solid #0d6efd;

    background: #f8f9fa;

    color: #495057;
}


/* ---------------------------------------------------------
   IMAGES
   --------------------------------------------------------- */

.lesson-slide img {
    max-width: 100%;
    height: auto;

    display: block;

    margin: 1.5rem auto;

    border-radius: 8px;
}


/* ---------------------------------------------------------
   NAVIGATION
   --------------------------------------------------------- */

.lesson-navigation {
    display: flex;

    align-items: center;

    gap: 1rem;

    margin-top: 1rem;
}

.lesson-navigation-center {
    flex: 1;
}

.lesson-progress {
    width: 100%;
    height: 5px;

    background: #e9ecef;

    border-radius: 5px;

    overflow: hidden;
}

.lesson-progress-bar {
    width: 0;
    height: 100%;

    background: #0d6efd;

    transition: width 0.2s ease;
}


/* ---------------------------------------------------------
   KEYBOARD HELP
   --------------------------------------------------------- */

.lesson-keyboard-help {
    display: flex;

    justify-content: center;

    gap: 1rem;

    margin-top: 0.75rem;

    color: #6c757d;

    font-size: 0.8rem;
}

.lesson-keyboard-help kbd {
    margin: 0 2px;
}


/* ---------------------------------------------------------
   INDEX
   --------------------------------------------------------- */

.lesson-index {
    position: absolute;

    z-index: 100;

    top: 65px;
    left: 0;
    right: 0;

    max-height: 70vh;

    overflow-y: auto;

    padding: 1rem;

    background: #ffffff;

    border: 1px solid #dee2e6;

    border-radius: 8px;

    box-shadow:
        0 5px 20px rgba(0, 0, 0, 0.15);
}

.lesson-index-header {
    display: flex;

    justify-content: space-between;

    align-items: center;

    margin-bottom: 1rem;

    padding-bottom: 0.75rem;

    border-bottom: 1px solid #dee2e6;
}

.lesson-index-item {
    display: block;

    width: 100%;

    margin-bottom: 0.35rem;

    padding: 0.65rem 0.75rem;

    text-align: left;

    background: #f8f9fa;

    border: 1px solid #dee2e6;

    border-radius: 5px;

    color: #343a40;

    cursor: pointer;

    transition:
        background-color 0.15s ease,
        border-color 0.15s ease;
}

.lesson-index-item:hover {
    background: #e9ecef;
}

.lesson-index-item.active {
    background: #0d6efd;
    color: #ffffff;
    border-color: #0d6efd;
}


/* ---------------------------------------------------------
   FULLSCREEN
   --------------------------------------------------------- */

.lesson-container:fullscreen {
    background: #f5f5f5;

    padding: 2rem;

    overflow: auto;
}

.lesson-container:fullscreen .lesson-toolbar {
    margin-bottom: 1rem;
}

.lesson-container:fullscreen .lesson-slideshow {
    min-height: calc(100vh - 180px);
}

.lesson-container:fullscreen .lesson-slide {
    min-height: calc(100vh - 180px);

    padding:
        4rem 8rem;
}


/* ---------------------------------------------------------
   ANIMATION
   --------------------------------------------------------- */

@keyframes lessonSlideIn {

    from {
        opacity: 0;
        transform: translateX(15px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }

}


/* ---------------------------------------------------------
   RESPONSIVE
   --------------------------------------------------------- */

@media (max-width: 992px) {

    .lesson-slide {
        padding: 2rem;
    }

    .lesson-slide p,
    .lesson-slide li {
        font-size: 1.05rem;
    }

}


@media (max-width: 768px) {

    .lesson-toolbar {
        flex-wrap: wrap;
    }

    .lesson-toolbar-center {
        order: 3;

        flex-basis: 100%;
    }

    .lesson-slide {
        min-height: 400px;

        padding: 1.5rem;
    }

    .lesson-slide h1 {
        font-size: 2rem;
    }

    .lesson-slide h2 {
        font-size: 1.6rem;
    }

    .lesson-slide p,
    .lesson-slide li {
        font-size: 1rem;
        line-height: 1.6;
    }

    .lesson-navigation {
        gap: 0.5rem;
    }

}


@media (max-width: 576px) {

    .lesson-slideshow {
        border-radius: 6px;
    }

    .lesson-slide {
        min-height: 350px;

        padding: 1rem;
    }

    .lesson-slide pre {
        font-size: 0.8rem;
    }

    .lesson-keyboard-help {
        display: none;
    }

}