/* =========================================================
   EXISTING LEARNING STYLES
========================================================= */

.learning-main {

    max-width: 800px;

    margin: 0 auto;

    padding: 2rem 1rem;

}

.learning-main select {

    max-width: 320px;

    margin-bottom: 1.5rem;

}

.topic-path-item {

    background-color: var(--color-surface);

    border: 1px solid var(--color-border);

    border-radius: var(--radius);

    padding: 1.25rem;

    margin-bottom: 1rem;

}

.topic-path-item h3 {

    margin-bottom: 0.5rem;

}

.difficulty-row {

    display: flex;

    gap: 0.75rem;

    flex-wrap: wrap;

    margin-top: 0.75rem;

}

.difficulty-chip {

    padding: 0.4rem 0.9rem;

    border-radius: 999px;

    border: 1px solid var(--color-border);

    text-decoration: none;

    color: var(--color-text);

    font-size: 0.85rem;

}

.difficulty-chip.completed {

    background-color: #dcfce7;

    border-color: #16a34a;

}


/* =========================================================
   LEARNING PAGE FOUNDATION
========================================================= */

.learning-main {

    width: 100%;

    max-width: none;

    margin: 0;

    padding: 0;

    overflow: hidden;

}

.learning-main section {

    width: 100%;

}


/* =========================================================
   LEARNING BRAND
========================================================= */

.learning-brand {

    display: flex;

    align-items: center;

    gap: 0.75rem;

}

.learning-brand h1 {

    margin: 0;

    font-size: 1.25rem;

    font-weight: 800;

    letter-spacing: -0.02em;

}

.learning-brand span {

    padding-left: 0.75rem;

    border-left: 1px solid var(--color-border);

    color: var(--color-text-muted);

    font-size: 0.78rem;

}


/* =========================================================
   SECTION LABEL
========================================================= */

.learning-main .section-label {

    display: inline-flex;

    align-items: center;

    justify-content: center;

    padding: 0.45rem 0.9rem;

    margin-bottom: 1.25rem;

    border: 1px solid rgba(29, 78, 216, 0.16);

    border-radius: 999px;

    background: rgba(29, 78, 216, 0.06);

    color: var(--color-primary);

    font-size: 0.75rem;

    font-weight: 800;

    letter-spacing: 0.08em;

    text-transform: uppercase;

}


/* =========================================================
   LEARNING HERO
========================================================= */

.learning-hero {

    position: relative;

    display: flex;

    align-items: center;

    justify-content: center;

    min-height: 430px;

    padding: 6rem 1.5rem;

    overflow: hidden;

    background:
        radial-gradient(
            circle at 50% 0%,
            rgba(29, 78, 216, 0.09),
            transparent 48%
        ),
        var(--color-background);

    text-align: center;

    border-bottom: 1px solid var(--color-border);

}

.learning-hero::before {

    content: "";

    position: absolute;

    width: 380px;

    height: 380px;

    top: -220px;

    left: 50%;

    transform: translateX(-50%);

    border-radius: 50%;

    background: rgba(29, 78, 216, 0.05);

}

.learning-hero-content {

    position: relative;

    z-index: 2;

    max-width: 820px;

    margin: 0 auto;

}

.learning-hero-content h2 {

    margin: 0;

    font-size: clamp(3rem, 7vw, 5rem);

    line-height: 1;

    font-weight: 800;

    letter-spacing: -0.05em;

}

.learning-hero-content p {

    max-width: 680px;

    margin: 1.5rem auto 0;

    color: var(--color-text-muted);

    font-size: clamp(1rem, 2vw, 1.15rem);

    line-height: 1.8;

}


/* =========================================================
   SHARED SECTION HEADING
========================================================= */

.learning-section-heading {

    display: flex;

    align-items: flex-end;

    justify-content: space-between;

    gap: 3rem;

    max-width: 1100px;

    margin: 0 auto 2.75rem;

}

.learning-section-heading h3 {

    margin: 0;

    font-size: clamp(1.9rem, 4vw, 2.8rem);

    line-height: 1.1;

    letter-spacing: -0.035em;

}

.learning-section-heading > p {

    max-width: 380px;

    margin: 0;

    color: var(--color-text-muted);

    font-size: 0.92rem;

    line-height: 1.7;

}


/* =========================================================
   COURSE SELECTION
========================================================= */

.learning-selection {

    padding: 7rem 1.5rem;

    background: var(--color-surface);

    border-bottom: 1px solid var(--color-border);

}

.course-selector-card {

    display: flex;

    align-items: flex-start;

    gap: 1.5rem;

    max-width: 1100px;

    margin: 0 auto;

    padding: 2rem;

    border: 1px solid var(--color-border);

    border-radius: calc(var(--radius) + 2px);

    background: var(--color-background);

    transition:
        border-color 0.25s ease,
        box-shadow 0.25s ease;

}

.course-selector-card:focus-within {

    border-color: rgba(29, 78, 216, 0.35);

    box-shadow: 0 15px 35px rgba(31, 41, 55, 0.06);

}

.selector-icon {

    display: flex;

    align-items: center;

    justify-content: center;

    flex: 0 0 auto;

    width: 46px;

    height: 46px;

    border-radius: 50%;

    background: var(--color-primary);

    color: #ffffff;

    font-size: 0.72rem;

    font-weight: 800;

    letter-spacing: 0.05em;

}

.selector-content {

    flex: 1;

    min-width: 0;

}

.selector-content label {

    margin: 0 0 0.6rem;

    color: var(--color-text);

    font-size: 0.95rem;

}

.selector-content select {

    width: 100%;

    max-width: 480px;

    margin: 0;

    padding: 0.9rem 1rem;

    background-color: var(--color-surface);

    color: var(--color-text);

    font-weight: 600;

    cursor: pointer;

}

.selector-content p {

    margin: 0.75rem 0 0;

    color: var(--color-text-muted);

    font-size: 0.85rem;

}


/* =========================================================
   LEARNING PATH
========================================================= */

.learning-path-section {

    padding: 7rem 1.5rem;

    background: var(--color-background);

    border-bottom: 1px solid var(--color-border);

}

.topic-path-container {

    max-width: 1100px;

    margin: 0 auto;

}

.topic-path-header {

    display: flex;

    align-items: center;

    justify-content: space-between;

    padding: 0 1.5rem 0.9rem;

    color: var(--color-text-muted);

    font-size: 0.75rem;

    font-weight: 700;

    letter-spacing: 0.07em;

    text-transform: uppercase;

}


/* =========================================================
   TOPIC PATH
========================================================= */

.topic-path {

    display: grid;

    gap: 1rem;

}

.topic-path-item {

    position: relative;

    margin: 0;

    padding: 1.75rem;

    background-color: var(--color-surface);

    border: 1px solid var(--color-border);

    border-radius: var(--radius);

    transition:
        transform 0.25s ease,
        border-color 0.25s ease,
        box-shadow 0.25s ease;

}

.topic-path-item:hover {

    transform: translateY(-3px);

    border-color: rgba(29, 78, 216, 0.22);

    box-shadow: 0 15px 35px rgba(31, 41, 55, 0.06);

}

.topic-path-item h3 {

    margin: 0;

    color: var(--color-text);

    font-size: 1.2rem;

    line-height: 1.35;

    letter-spacing: -0.015em;

}

.topic-path-item p {

    margin: 0.6rem 0 0;

    color: var(--color-text-muted);

    font-size: 0.9rem;

    line-height: 1.6;

}


/* =========================================================
   DIFFICULTY ROW
========================================================= */

.difficulty-row {

    display: flex;

    align-items: center;

    gap: 0.6rem;

    flex-wrap: wrap;

    margin-top: 1.25rem;

    padding-top: 1.1rem;

    border-top: 1px solid var(--color-border);

}

.difficulty-chip {

    display: inline-flex;

    align-items: center;

    justify-content: center;

    min-height: 34px;

    padding: 0.4rem 0.85rem;

    border-radius: 999px;

    border: 1px solid var(--color-border);

    background: var(--color-surface);

    color: var(--color-text);

    font-size: 0.8rem;

    font-weight: 600;

    transition:
        background-color 0.2s ease,
        border-color 0.2s ease,
        color 0.2s ease,
        transform 0.2s ease;

}

.difficulty-chip:hover {

    background-color: rgba(29, 78, 216, 0.06);

    border-color: rgba(29, 78, 216, 0.3);

    color: var(--color-primary);

    text-decoration: none;

    transform: translateY(-1px);

}

.difficulty-chip.completed {

    background-color: rgba(29, 78, 216, 0.08);

    border-color: rgba(29, 78, 216, 0.3);

    color: var(--color-primary);

}


/* =========================================================
   LEARNING GUIDANCE
========================================================= */

.learning-guidance {

    padding: 8rem 1.5rem;

    background: var(--color-surface);

}

.learning-guidance-content {

    max-width: 820px;

    margin: 0 auto;

    text-align: center;

}

.learning-guidance-content h3 {

    margin: 0;

    font-size: clamp(2rem, 4vw, 3.2rem);

    line-height: 1.08;

    letter-spacing: -0.04em;

}

.learning-guidance-content p {

    max-width: 680px;

    margin: 1.4rem auto 0;

    color: var(--color-text-muted);

    font-size: 1rem;

    line-height: 1.8;

}


/* =========================================================
   EMPTY TOPIC STATE
========================================================= */

.topic-path:empty {

    display: flex;

    align-items: center;

    justify-content: center;

    min-height: 220px;

    padding: 2rem;

    border: 1px dashed var(--color-border);

    border-radius: var(--radius);

    background: var(--color-surface);

}

.topic-path:empty::after {

    content: "Select a course to view its learning path.";

    color: var(--color-text-muted);

    font-size: 0.92rem;

    text-align: center;

}


/* =========================================================
   TABLET
========================================================= */

@media (max-width: 900px) {

    .learning-section-heading {

        align-items: flex-start;

        flex-direction: column;

        gap: 0.75rem;

    }

}


/* =========================================================
   MOBILE
========================================================= */

@media (max-width: 700px) {

    .learning-brand span {

        display: none;

    }

    .learning-hero {

        min-height: 400px;

        padding: 5rem 1.25rem;

    }

    .learning-hero-content h2 {

        font-size: 3.5rem;

    }

    .learning-selection,
    .learning-path-section,
    .learning-guidance {

        padding: 5rem 1.25rem;

    }

    .course-selector-card {

        flex-direction: column;

        padding: 1.5rem;

    }

    .selector-icon {

        width: 42px;

        height: 42px;

    }

    .topic-path-header {

        padding-left: 0;

        padding-right: 0;

    }

    .topic-path-item {

        padding: 1.5rem;

    }

}


/* =========================================================
   SMALL MOBILE
========================================================= */

@media (max-width: 420px) {

    .learning-hero-content h2 {

        font-size: 3rem;

    }

    .learning-selection,
    .learning-path-section,
    .learning-guidance {

        padding-left: 1rem;

        padding-right: 1rem;

    }

    .topic-path-header span:last-child {

        display: none;

    }

}