/* =========================================================
   PMAI LAB — COURSES PAGE
   Premium Academic Course Layout
   Version 3.0
========================================================= */


/* =========================================================
   GLOBAL COURSE PAGE
========================================================= */

.courses-hero,
.course-filters,
.course-area,
.materials-section,
.faculty-upload-section,
.courses-final-cta {
    width: 100%;
    box-sizing: border-box;
}


/* =========================================================
   COURSES HERO
========================================================= */

.courses-hero {
    position: relative;
    padding: 110px 24px 95px;
    overflow: hidden;

    background:
        radial-gradient(
            circle at 15% 20%,
            rgba(37, 99, 235, 0.10),
            transparent 35%
        ),
        radial-gradient(
            circle at 85% 80%,
            rgba(124, 58, 237, 0.10),
            transparent 35%
        ),
        #f8fafc;
}

.courses-hero-content {
    width: min(1080px, 100%);
    margin: 0 auto;
    text-align: center;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    margin-bottom: 16px;

    padding: 7px 14px;

    border: 1px solid rgba(37, 99, 235, 0.18);
    border-radius: 999px;

    background: rgba(255, 255, 255, 0.8);

    color: #2563eb;

    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.12em;
}

.courses-hero .section-label {
    margin-bottom: 12px;
}

.courses-hero h1 {
    margin: 0 auto 20px;

    max-width: 850px;

    color: #0f172a;

    font-size: clamp(2.3rem, 5vw, 4.3rem);
    line-height: 1.05;
    letter-spacing: -0.045em;
}

.courses-hero-description {
    max-width: 760px;

    margin: 0 auto;

    color: #64748b;

    font-size: 1.05rem;
    line-height: 1.8;
}

.courses-hero-actions {
    display: flex;

    justify-content: center;
    align-items: center;
    gap: 14px;

    margin-top: 32px;

    flex-wrap: wrap;
}


/* =========================================================
   COURSE FILTERS
========================================================= */

.course-filters {
    padding: 90px 24px 75px;

    background: #ffffff;
}

.section-heading {
    width: min(1050px, 100%);

    margin: 0 auto 45px;

    text-align: center;
}

.section-heading .section-label {
    margin-bottom: 10px;
}

.section-heading h2 {
    margin: 0 0 14px;

    color: #0f172a;

    font-size: clamp(2rem, 4vw, 3rem);
    line-height: 1.15;

    letter-spacing: -0.035em;
}

.section-heading > p:last-child {
    max-width: 700px;

    margin: 0 auto;

    color: #64748b;

    line-height: 1.75;
}


/* =========================================================
   FILTER GRID
========================================================= */

.filter-grid {
    width: min(1100px, 100%);

    margin: 0 auto;

    display: grid;

    grid-template-columns:
        repeat(2, minmax(0, 1fr));

    gap: 20px;
}

.filter-card {
    position: relative;

    min-height: 185px;

    display: grid;

    grid-template-columns:
        62px minmax(0, 1fr) auto;

    align-items: center;

    gap: 18px;

    padding: 25px;

    text-decoration: none;

    border: 1px solid #e2e8f0;
    border-radius: 18px;

    background: #ffffff;

    box-shadow:
        0 8px 25px rgba(15, 23, 42, 0.05);

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

.filter-card:hover {
    transform: translateY(-5px);

    border-color: rgba(37, 99, 235, 0.35);

    box-shadow:
        0 18px 40px rgba(15, 23, 42, 0.10);
}

.filter-icon {
    width: 62px;
    height: 62px;

    display: flex;
    align-items: center;
    justify-content: center;

    flex-shrink: 0;

    border-radius: 16px;

    background:
        linear-gradient(
            135deg,
            rgba(37, 99, 235, 0.10),
            rgba(124, 58, 237, 0.12)
        );

    color: #2563eb;

    font-size: 1.35rem;
    font-weight: 800;
}

.filter-number {
    display: block;

    margin-bottom: 5px;

    color: #94a3b8;

    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.12em;
}

.filter-card h3 {
    margin: 0 0 7px;

    color: #0f172a;

    font-size: 1.2rem;
}

.filter-card p {
    margin: 0;

    color: #64748b;

    font-size: 0.88rem;
    line-height: 1.55;
}

.filter-arrow {
    align-self: end;

    white-space: nowrap;

    color: #2563eb;

    font-size: 0.78rem;
    font-weight: 800;
}


/* =========================================================
   COURSE AREA
========================================================= */

.course-area {
    padding: 85px 24px;

    background: #f8fafc;
}

.course-area:nth-of-type(even) {
    background: #ffffff;
}


/* =========================================================
   COURSE AREA HEADER
========================================================= */

.course-area-heading {
    width: min(1040px, 100%);

    margin: 0 auto 34px;

    display: flex;

    align-items: flex-end;
    justify-content: space-between;

    gap: 30px;
}

.course-area-heading > div {
    min-width: 0;
}

.course-area-heading .section-label {
    margin-bottom: 8px;
}

.course-area-heading h2 {
    margin: 0 0 10px;

    color: #0f172a;

    font-size: clamp(1.9rem, 4vw, 2.7rem);
    line-height: 1.15;

    letter-spacing: -0.035em;
}

.course-area-description {
    max-width: 700px;

    margin: 0;

    color: #64748b;

    font-size: 0.96rem;
    line-height: 1.7;
}

.course-area-badge {
    flex-shrink: 0;

    padding: 9px 15px;

    border: 1px solid #dbeafe;
    border-radius: 999px;

    background: #eff6ff;

    color: #2563eb;

    font-size: 0.75rem;
    font-weight: 800;

    white-space: nowrap;
}


/* =========================================================
   COURSE LIST
========================================================= */

.course-list {
    width: min(1040px, 100%);

    margin: 0 auto;

    display: flex;

    flex-direction: column;

    gap: 16px;
}


/* =========================================================
   COURSE CARD
   IMPORTANT:
   Narrower + horizontal layout
========================================================= */

.course-card {
    position: relative;

    width: 100%;
    max-width: 100%;

    min-height: 145px;

    box-sizing: border-box;

    display: grid;

    /*
       LEFT  = IMAGE / SYMBOL
       CENTER = COURSE CONTENT
       RIGHT = MATERIAL BUTTON
    */
    grid-template-columns:
        105px minmax(0, 1fr) auto;

    align-items: center;

    gap: 22px;

    padding: 18px 22px;

    border: 1px solid #e2e8f0;
    border-radius: 16px;

    background: #ffffff;

    box-shadow:
        0 6px 20px rgba(15, 23, 42, 0.045);

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

.course-card:hover {
    transform: translateY(-3px);

    border-color: rgba(37, 99, 235, 0.28);

    box-shadow:
        0 14px 32px rgba(15, 23, 42, 0.09);
}


/* =========================================================
   FEATURED COURSE
========================================================= */

.featured-course {
    border-color: rgba(37, 99, 235, 0.22);

    background:
        linear-gradient(
            135deg,
            #ffffff 0%,
            #f8fbff 100%
        );
}


/* =========================================================
   COURSE IMAGE / CODE
========================================================= */

.course-code {
    width: 105px;
    height: 105px;

    flex-shrink: 0;

    display: flex;
    align-items: center;
    justify-content: center;

    overflow: hidden;

    border-radius: 14px;

    background:
        linear-gradient(
            135deg,
            #eff6ff,
            #f5f3ff
        );

    border: 1px solid #e0e7ff;
}


/* =========================================================
   COURSE IMAGE
========================================================= */

.course-code.course-image {
    padding: 0;
}

.course-code.course-image img {
    width: 100%;
    height: 100%;

    display: block;

    object-fit: cover;

    transition: transform 0.35s ease;
}

.course-card:hover .course-code.course-image img {
    transform: scale(1.05);
}


/* =========================================================
   COURSE SYMBOL
========================================================= */

.course-symbol {
    display: flex;

    align-items: center;
    justify-content: center;

    width: 68px;
    height: 68px;

    border-radius: 50%;

    background:
        linear-gradient(
            135deg,
            #2563eb,
            #7c3aed
        );

    color: #ffffff;

    font-size: 1.15rem;
    font-weight: 900;

    box-shadow:
        0 8px 20px rgba(37, 99, 235, 0.22);
}


/* =========================================================
   COURSE MAIN
========================================================= */

.course-main {
    min-width: 0;

    display: flex;

    flex-direction: column;

    justify-content: center;

    align-items: flex-start;
}

.course-index {
    display: block;

    margin-bottom: 5px;

    color: #2563eb;

    font-size: 0.68rem;
    font-weight: 900;

    letter-spacing: 0.11em;
    text-transform: uppercase;
}

.course-main h3 {
    margin: 0 0 7px;

    color: #0f172a;

    font-size: 1.18rem;
    line-height: 1.3;

    letter-spacing: -0.015em;
}

.course-main p {
    max-width: 680px;

    margin: 0;

    color: #64748b;

    font-size: 0.86rem;
    line-height: 1.55;
}


/* =========================================================
   COURSE META
========================================================= */

.course-meta {
    display: flex;

    align-items: center;

    flex-wrap: wrap;

    gap: 7px;

    margin-top: 10px;
}

.course-meta span {
    display: inline-flex;

    align-items: center;

    min-height: 25px;

    padding: 4px 9px;

    border-radius: 999px;

    background: #f1f5f9;

    color: #475569;

    font-size: 0.67rem;
    font-weight: 700;
}


/* =========================================================
   COURSE MATERIAL BUTTON
   Stays on RIGHT
========================================================= */

.course-button {
    display: inline-flex;

    align-items: center;
    justify-content: center;

    min-width: 145px;

    padding: 11px 14px;

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

    background: #eff6ff;

    color: #2563eb;

    text-decoration: none;

    font-size: 0.76rem;
    font-weight: 800;

    white-space: nowrap;

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

.course-button:hover {
    background: #2563eb;

    border-color: #2563eb;

    color: #ffffff;

    transform: translateY(-1px);
}


/* =========================================================
   MATERIALS SECTION
========================================================= */

.materials-section {
    padding: 90px 24px;

    background: #ffffff;
}

.materials-grid {
    width: min(1050px, 100%);

    margin: 0 auto;

    display: grid;

    grid-template-columns:
        repeat(3, minmax(0, 1fr));

    gap: 18px;
}

.materials-grid article {
    padding: 25px;

    border: 1px solid #e2e8f0;
    border-radius: 16px;

    background: #ffffff;

    box-shadow:
        0 6px 20px rgba(15, 23, 42, 0.04);

    transition:
        transform 0.25s ease,
        box-shadow 0.25s ease;
}

.materials-grid article:hover {
    transform: translateY(-4px);

    box-shadow:
        0 14px 30px rgba(15, 23, 42, 0.08);
}

.materials-grid article > span {
    display: inline-flex;

    align-items: center;
    justify-content: center;

    width: 45px;
    height: 45px;

    margin-bottom: 15px;

    border-radius: 12px;

    background: #f1f5f9;

    font-size: 1.3rem;
}

.materials-grid h3 {
    margin: 0 0 8px;

    color: #0f172a;

    font-size: 1rem;
}

.materials-grid p {
    margin: 0;

    color: #64748b;

    font-size: 0.84rem;

    line-height: 1.65;
}


/* =========================================================
   FACULTY UPLOAD SECTION
========================================================= */

.faculty-upload-section {
    padding: 80px 24px;

    background:
        linear-gradient(
            135deg,
            #eff6ff,
            #f5f3ff
        );
}

.faculty-upload-box {
    width: min(850px, 100%);

    margin: 0 auto;

    padding: 48px;

    text-align: center;

    border: 1px solid rgba(37, 99, 235, 0.15);

    border-radius: 22px;

    background: rgba(255, 255, 255, 0.78);

    box-shadow:
        0 20px 50px rgba(15, 23, 42, 0.07);

    backdrop-filter: blur(10px);
}

.faculty-upload-box h2 {
    margin: 0 0 14px;

    color: #0f172a;

    font-size: clamp(1.8rem, 4vw, 2.6rem);

    letter-spacing: -0.035em;
}

.faculty-upload-box > p:not(.section-label) {
    max-width: 680px;

    margin: 0 auto 25px;

    color: #64748b;

    line-height: 1.75;
}


/* =========================================================
   FINAL CTA
========================================================= */

.courses-final-cta {
    padding: 90px 24px;

    background: #0f172a;
}

.courses-final-cta .section-label {
    color: #93c5fd;
}

.courses-final-cta h2 {
    color: #ffffff;
}

.courses-final-cta .section-heading > p:last-child {
    color: #94a3b8;
}

.hero-buttons {
    display: flex;

    justify-content: center;
    align-items: center;

    gap: 14px;

    margin-top: 28px;

    flex-wrap: wrap;
}


/* =========================================================
   BUTTONS
========================================================= */

.courses-hero .btn,
.courses-final-cta .btn,
.faculty-upload-box .btn {
    display: inline-flex;

    align-items: center;
    justify-content: center;

    min-height: 44px;

    padding: 11px 20px;

    border-radius: 10px;

    text-decoration: none;

    font-size: 0.82rem;
    font-weight: 800;

    transition:
        transform 0.2s ease,
        box-shadow 0.2s ease;
}

.courses-hero .btn:hover,
.courses-final-cta .btn:hover,
.faculty-upload-box .btn:hover {
    transform: translateY(-2px);
}


/* =========================================================
   RESPONSIVE — TABLET
========================================================= */

@media (max-width: 900px) {

    .course-card {
        grid-template-columns:
            90px minmax(0, 1fr) auto;

        gap: 16px;

        padding: 16px;
    }

    .course-code {
        width: 90px;
        height: 90px;
    }

    .course-button {
        min-width: 125px;

        padding: 10px 11px;

        font-size: 0.7rem;
    }

    .filter-grid {
        grid-template-columns: 1fr;
    }

    .materials-grid {
        grid-template-columns:
            repeat(2, minmax(0, 1fr));
    }

}


/* =========================================================
   RESPONSIVE — MOBILE
========================================================= */

@media (max-width: 680px) {

    .courses-hero {
        padding: 80px 18px 70px;
    }

    .course-filters,
    .course-area,
    .materials-section,
    .faculty-upload-section,
    .courses-final-cta {
        padding-left: 18px;
        padding-right: 18px;
    }


    /* -------------------------
       Filter Cards
    ------------------------- */

    .filter-card {
        grid-template-columns:
            52px minmax(0, 1fr);

        padding: 18px;

        gap: 14px;
    }

    .filter-icon {
        width: 52px;
        height: 52px;
    }

    .filter-arrow {
        grid-column: 2;

        align-self: start;

        margin-top: -5px;
    }


    /* -------------------------
       Area Header
    ------------------------- */

    .course-area-heading {
        align-items: flex-start;

        flex-direction: column;

        gap: 15px;
    }


    /* -------------------------
       Course Card
    ------------------------- */

    .course-card {
        /*
           Keep the original
           horizontal academic layout
           on mobile as much as possible.
        */

        grid-template-columns:
            72px minmax(0, 1fr);

        align-items: center;

        gap: 14px;

        padding: 14px;
    }

    .course-code {
        width: 72px;
        height: 72px;

        border-radius: 12px;
    }

    .course-symbol {
        width: 50px;
        height: 50px;

        font-size: 0.95rem;
    }

    .course-main h3 {
        font-size: 1rem;
    }

    .course-main p {
        font-size: 0.79rem;

        line-height: 1.5;
    }

    .course-meta {
        margin-top: 8px;
    }

    .course-meta span {
        font-size: 0.61rem;
    }

    /*
       Material button remains associated
       with course content rather than
       appearing beside the image.
    */

    .course-button {
        grid-column: 2;

        justify-self: start;

        min-width: auto;

        padding: 9px 12px;

        font-size: 0.68rem;
    }


    /* -------------------------
       Materials
    ------------------------- */

    .materials-grid {
        grid-template-columns: 1fr;
    }


    /* -------------------------
       Faculty Box
    ------------------------- */

    .faculty-upload-box {
        padding: 32px 22px;
    }

}


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

@media (max-width: 430px) {

    .courses-hero h1 {
        font-size: 2.15rem;
    }

    .course-card {
        grid-template-columns:
            60px minmax(0, 1fr);

        gap: 12px;

        padding: 12px;
    }

    .course-code {
        width: 60px;
        height: 60px;
    }

    .course-symbol {
        width: 43px;
        height: 43px;

        font-size: 0.82rem;
    }

    .course-index {
        font-size: 0.6rem;
    }

    .course-main h3 {
        font-size: 0.92rem;
    }

    .course-main p {
        font-size: 0.75rem;
    }

    .course-button {
        grid-column: 2;

        font-size: 0.64rem;
    }

}


/* =========================================================
   ACCESSIBILITY
========================================================= */

.course-card:focus-within,
.filter-card:focus-visible,
.course-button:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.25);

    outline-offset: 3px;
}


/* =========================================================
   REDUCE MOTION
========================================================= */

@media (prefers-reduced-motion: reduce) {

    .course-card,
    .filter-card,
    .materials-grid article,
    .course-button,
    .course-code.course-image img {
        transition: none;
    }

}