/* =========================================================
   PMAI LAB — YOUTUBE HUB
   Premium Academic Media Platform
   Version 3.0
========================================================= */


/* =========================================================
   GLOBAL YOUTUBE PAGE
========================================================= */

.youtube-page {

    --yt-primary: var(--primary, #0f172a);
    --yt-accent: var(--accent, #2563eb);
    --yt-text: var(--text, #0f172a);
    --yt-muted: var(--text-light, #64748b);
    --yt-border: var(--border, #e2e8f0);
    --yt-surface: var(--surface, #f8fafc);

    background: #ffffff;

}


/* =========================================================
   COMMON CONTAINER
========================================================= */

.youtube-page .youtube-container {

    width: 100%;

    max-width: 1180px;

    margin: 0 auto;

    padding-left: 20px;
    padding-right: 20px;

}


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

.youtube-page .section-label {

    display: inline-flex;

    align-items: center;

    gap: 8px;

    margin: 0 0 14px;

    color: var(--yt-accent);

    font-size: 0.72rem;

    font-weight: 800;

    letter-spacing: 1.5px;

    text-transform: uppercase;

}


.youtube-page .section-label::before {

    content: "";

    width: 24px;

    height: 2px;

    border-radius: 10px;

    background: var(--yt-accent);

}


/* =========================================================
   COMMON SECTION HEADING
========================================================= */

.youtube-page .section-heading {

    max-width: 760px;

    margin-bottom: 48px;

}


.youtube-page .section-heading h2 {

    margin: 0 0 16px;

    color: var(--yt-primary);

    font-family: "Poppins", sans-serif;

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

    line-height: 1.15;

    letter-spacing: -1px;

}


.youtube-page .section-heading h2 span {

    color: var(--yt-accent);

}


.youtube-page .section-heading p:not(.section-label) {

    margin: 0;

    color: var(--yt-muted);

    font-size: 0.98rem;

    line-height: 1.8;

}


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

.youtube-page .btn {

    display: inline-flex;

    align-items: center;

    justify-content: center;

    gap: 8px;

    min-height: 48px;

    padding: 13px 22px;

    border-radius: 9px;

    font-size: 0.8rem;

    font-weight: 800;

    text-decoration: none;

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

}


.youtube-page .btn:hover {

    transform: translateY(-3px);

}


.youtube-page .btn-primary {

    background: var(--yt-primary);

    color: #ffffff;

    box-shadow:
        0 10px 25px rgba(
            15,
            23,
            42,
            0.12
        );

}


.youtube-page .btn-primary:hover {

    background: var(--yt-accent);

    box-shadow:
        0 14px 30px rgba(
            37,
            99,
            235,
            0.20
        );

}


.youtube-page .btn-secondary {

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

    background: rgba(
        255,
        255,
        255,
        0.9
    );

    color: var(--yt-primary);

}


.youtube-page .btn-secondary:hover {

    border-color: var(--yt-accent);

    color: var(--yt-accent);

}


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

.youtube-hero {

    position: relative;

    min-height: 680px;

    display: flex;

    align-items: center;

    padding: 105px 20px 90px;

    overflow: hidden;

    background:
        radial-gradient(
            circle at 85% 20%,
            rgba(
                37,
                99,
                235,
                0.12
            ),
            transparent 30%
        ),
        radial-gradient(
            circle at 10% 90%,
            rgba(
                15,
                23,
                42,
                0.07
            ),
            transparent 30%
        ),
        linear-gradient(
            135deg,
            #f8fafc 0%,
            #eff6ff 50%,
            #ffffff 100%
        );

}


.youtube-hero::before {

    content: "";

    position: absolute;

    width: 600px;

    height: 600px;

    top: -300px;

    right: -180px;

    border: 1px solid rgba(
        37,
        99,
        235,
        0.08
    );

    border-radius: 50%;

}


.youtube-hero::after {

    content: "";

    position: absolute;

    width: 350px;

    height: 350px;

    bottom: -230px;

    left: -150px;

    border: 1px solid rgba(
        15,
        23,
        42,
        0.06
    );

    border-radius: 50%;

}


.youtube-hero > .youtube-container {

    position: relative;

    z-index: 2;

    display: grid;

    grid-template-columns:
        minmax(0, 1.35fr)
        minmax(320px, 0.65fr);

    gap: 65px;

    align-items: center;

}


.youtube-hero-content {

    max-width: 760px;

}


.youtube-hero h1 {

    margin: 0 0 24px;

    color: var(--yt-primary);

    font-family: "Poppins", sans-serif;

    font-size: clamp(
        2.8rem,
        6vw,
        5rem
    );

    font-weight: 800;

    line-height: 1.04;

    letter-spacing: -2px;

}


.youtube-hero h1 span {

    display: block;

    color: var(--yt-accent);

}


.youtube-hero-description {

    max-width: 720px;

    margin: 0 0 32px;

    color: var(--yt-muted);

    font-size: 1.03rem;

    line-height: 1.85;

}


.youtube-hero-actions {

    display: flex;

    flex-wrap: wrap;

    gap: 12px;

}


/* =========================================================
   HERO CHANNEL CARD
========================================================= */

.youtube-channel-card {

    position: relative;

    overflow: hidden;

    border: 1px solid rgba(
        255,
        255,
        255,
        0.7
    );

    border-radius: 22px;

    background:
        linear-gradient(
            145deg,
            #ffffff,
            #f8fafc
        );

    box-shadow:
        0 30px 70px rgba(
            15,
            23,
            42,
            0.12
        );

    backdrop-filter: blur(15px);

    transition:
        transform 0.3s ease,
        box-shadow 0.3s ease;

}


.youtube-channel-card:hover {

    transform: translateY(-7px);

    box-shadow:
        0 35px 80px rgba(
            15,
            23,
            42,
            0.16
        );

}


.channel-card-top {

    display: flex;

    align-items: center;

    gap: 18px;

    padding: 28px;

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

}


.channel-icon {

    width: 62px;

    height: 62px;

    display: flex;

    align-items: center;

    justify-content: center;

    flex-shrink: 0;

    border-radius: 16px;

    background:
        linear-gradient(
            135deg,
            #ef4444,
            #dc2626
        );

    color: #ffffff;

    font-size: 1.3rem;

    box-shadow:
        0 10px 25px rgba(
            220,
            38,
            38,
            0.22
        );

}


.channel-card-top span {

    display: block;

    margin-bottom: 5px;

    color: var(--yt-accent);

    font-size: 0.62rem;

    font-weight: 800;

    letter-spacing: 1.2px;

}


.channel-card-top h3 {

    margin: 0;

    color: var(--yt-primary);

    font-family: "Poppins", sans-serif;

    font-size: 1.35rem;

}


.channel-card-body {

    padding: 26px 28px;

}


.channel-card-body > p {

    margin: 0 0 20px;

    color: var(--yt-muted);

    font-size: 0.85rem;

    line-height: 1.7;

}


.channel-card-line {

    width: 100%;

    height: 1px;

    margin-bottom: 20px;

    background: var(--yt-border);

}


.channel-card-meta {

    display: grid;

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

    gap: 10px;

}


.channel-card-meta span {

    display: flex;

    flex-direction: column;

    gap: 4px;

    color: var(--yt-muted);

    font-size: 0.65rem;

    line-height: 1.4;

}


.channel-card-meta strong {

    color: var(--yt-primary);

    font-size: 1rem;

}


.channel-card-button {

    display: flex;

    align-items: center;

    justify-content: space-between;

    padding: 17px 28px;

    background: var(--yt-primary);

    color: #ffffff;

    font-size: 0.78rem;

    font-weight: 800;

    text-decoration: none;

    transition: 0.25s ease;

}


.channel-card-button:hover {

    background: var(--yt-accent);

}


.channel-card-button span {

    font-size: 1.1rem;

}


/* =========================================================
   HERO STATS
========================================================= */

.youtube-stats {

    display: grid;

    grid-template-columns:
        repeat(4, 1fr);

    max-width: 760px;

    margin-top: 48px;

    border-top: 1px solid rgba(
        15,
        23,
        42,
        0.1
    );

}


.youtube-stat {

    padding: 22px 16px 0;

    border-right: 1px solid rgba(
        15,
        23,
        42,
        0.08
    );

}


.youtube-stat:last-child {

    border-right: none;

}


.youtube-stat strong {

    display: block;

    margin-bottom: 5px;

    color: var(--yt-primary);

    font-family: "Poppins", sans-serif;

    font-size: 1.5rem;

}


.youtube-stat span {

    display: block;

    color: var(--yt-muted);

    font-size: 0.66rem;

    line-height: 1.5;

}


/* =========================================================
   INTRODUCTION
========================================================= */

.youtube-introduction {

    padding: 100px 20px;

    background: #ffffff;

}


.youtube-introduction-grid {

    display: grid;

    grid-template-columns:
        minmax(0, 0.9fr)
        minmax(0, 1.1fr);

    gap: 70px;

    align-items: start;

}


.youtube-introduction h2 {

    margin: 0;

    color: var(--yt-primary);

    font-family: "Poppins", sans-serif;

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

    line-height: 1.2;

}


.youtube-introduction h2 span {

    display: block;

    color: var(--yt-accent);

}


.youtube-introduction-grid > div:last-child {

    padding: 30px;

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

    border-radius: 18px;

    background: var(--yt-surface);

}


.youtube-introduction-grid > div:last-child p {

    margin: 0;

    color: var(--yt-muted);

    font-size: 0.9rem;

    line-height: 1.8;

}


.youtube-introduction-grid > div:last-child p + p {

    margin-top: 16px;

}


/* =========================================================
   SYSTEM WORKFLOW
========================================================= */

.youtube-system {

    padding: 100px 20px;

    background: var(--yt-surface);

}


.youtube-system-grid {

    display: grid;

    grid-template-columns:
        1fr
        auto
        1fr
        auto
        1fr
        auto
        1fr;

    gap: 12px;

    align-items: stretch;

}


.system-card {

    position: relative;

    padding: 28px 24px;

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

    border-radius: 18px;

    background: #ffffff;

    box-shadow:
        0 10px 30px rgba(
            15,
            23,
            42,
            0.04
        );

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

}


.system-card:hover {

    transform: translateY(-6px);

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

    box-shadow:
        0 20px 40px rgba(
            15,
            23,
            42,
            0.08
        );

}


.system-number {

    position: absolute;

    top: 16px;

    right: 18px;

    color: #cbd5e1;

    font-size: 0.68rem;

    font-weight: 900;

}


.system-icon {

    width: 52px;

    height: 52px;

    display: flex;

    align-items: center;

    justify-content: center;

    margin-bottom: 20px;

    border-radius: 14px;

    background: #eff6ff;

    font-size: 1.3rem;

}


.system-card h3 {

    margin: 0 0 9px;

    color: var(--yt-primary);

    font-family: "Poppins", sans-serif;

    font-size: 1rem;

}


.system-card p {

    margin: 0;

    color: var(--yt-muted);

    font-size: 0.76rem;

    line-height: 1.7;

}


.system-arrow {

    display: flex;

    align-items: center;

    justify-content: center;

    color: var(--yt-accent);

    font-size: 1.4rem;

    font-weight: 800;

}


/* =========================================================
   LEARNING AREAS
========================================================= */

.youtube-areas {

    padding: 100px 20px;

    background: #ffffff;

}


.youtube-area-grid {

    display: grid;

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

    gap: 18px;

}


.youtube-area-card {

    position: relative;

    min-height: 250px;

    padding: 30px;

    overflow: hidden;

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

    border-radius: 18px;

    background: #ffffff;

    transition:
        transform 0.3s ease,
        box-shadow 0.3s ease,
        border-color 0.3s ease;

}


.youtube-area-card::after {

    content: "";

    position: absolute;

    width: 100px;

    height: 100px;

    right: -45px;

    bottom: -45px;

    border-radius: 50%;

    background: rgba(
        37,
        99,
        235,
        0.06
    );

}


.youtube-area-card:hover {

    transform: translateY(-7px);

    border-color: rgba(
        37,
        99,
        235,
        0.3
    );

    box-shadow:
        0 20px 45px rgba(
            15,
            23,
            42,
            0.08
        );

}


.area-number {

    position: absolute;

    top: 22px;

    right: 24px;

    color: #cbd5e1;

    font-size: 0.68rem;

    font-weight: 900;

}


.area-icon {

    width: 55px;

    height: 55px;

    display: flex;

    align-items: center;

    justify-content: center;

    margin-bottom: 20px;

    border-radius: 14px;

    background: #eff6ff;

    color: var(--yt-accent);

    font-size: 1rem;

    font-weight: 900;

}


.youtube-area-card h3 {

    margin: 0 0 10px;

    color: var(--yt-primary);

    font-family: "Poppins", sans-serif;

    font-size: 1.12rem;

}


.youtube-area-card p {

    margin: 0 0 20px;

    color: var(--yt-muted);

    font-size: 0.78rem;

    line-height: 1.7;

}


.youtube-area-card a {

    color: var(--yt-accent);

    font-size: 0.72rem;

    font-weight: 800;

    text-decoration: none;

}


.youtube-area-card a:hover {

    text-decoration: underline;

}


/* =========================================================
   FACULTY CONTRIBUTORS
========================================================= */

.youtube-contributors {

    padding: 100px 20px;

    background: var(--yt-surface);

}


.contributors-grid {

    display: grid;

    grid-template-columns:
        repeat(4, 1fr);

    gap: 18px;

}


.contributor-card {

    position: relative;

    min-height: 245px;

    display: flex;

    flex-direction: column;

    padding: 25px;

    overflow: hidden;

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

    border-radius: 18px;

    background: #ffffff;

    transition:
        transform 0.3s ease,
        border-color 0.3s ease,
        box-shadow 0.3s ease;

}


.contributor-card:hover {

    transform: translateY(-6px);

    border-color: rgba(
        37,
        99,
        235,
        0.3
    );

    box-shadow:
        0 20px 45px rgba(
            15,
            23,
            42,
            0.08
        );

}


.contributor-number {

    position: absolute;

    top: 18px;

    right: 20px;

    color: #cbd5e1;

    font-size: 0.68rem;

    font-weight: 900;

}


.contributor-avatar {

    width: 64px;

    height: 64px;

    display: flex;

    align-items: center;

    justify-content: center;

    margin-bottom: 20px;

    border-radius: 18px;

    background:
        linear-gradient(
            135deg,
            var(--yt-primary),
            #334155
        );

    color: #ffffff;

    font-family: "Poppins", sans-serif;

    font-size: 0.95rem;

    font-weight: 800;

}


.contributor-label {

    display: block;

    margin-bottom: 5px;

    color: var(--yt-accent);

    font-size: 0.58rem;

    font-weight: 800;

    letter-spacing: 1px;

}


.contributor-info h3 {

    margin: 0 0 7px;

    color: var(--yt-primary);

    font-family: "Poppins", sans-serif;

    font-size: 1rem;

}


.contributor-info p {

    margin: 0;

    color: var(--yt-muted);

    font-size: 0.72rem;

    line-height: 1.5;

}


.contributor-status {

    display: flex;

    align-items: center;

    gap: 7px;

    margin-top: auto;

    padding-top: 20px;

    color: #64748b;

    font-size: 0.62rem;

}


.contributor-status span {

    width: 7px;

    height: 7px;

    border-radius: 50%;

    background: #22c55e;

    box-shadow:
        0 0 0 4px rgba(
            34,
            197,
            94,
            0.1
        );

}


/* =========================================================
   COURSE MAPPING
========================================================= */

.youtube-course-mapping {

    padding: 100px 20px;

    background: #ffffff;

}


.course-mapping-flow {

    display: grid;

    grid-template-columns:
        1fr
        auto
        1fr
        auto
        1fr
        auto
        1fr
        auto
        1fr;

    gap: 12px;

    align-items: center;

}


.mapping-item {

    min-height: 170px;

    display: flex;

    flex-direction: column;

    align-items: center;

    justify-content: center;

    padding: 20px;

    text-align: center;

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

    border-radius: 18px;

    background: var(--yt-surface);

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

}


.mapping-item:hover {

    transform: translateY(-5px);

    box-shadow:
        0 15px 35px rgba(
            15,
            23,
            42,
            0.07
        );

}


.mapping-icon {

    width: 50px;

    height: 50px;

    display: flex;

    align-items: center;

    justify-content: center;

    margin-bottom: 13px;

    border-radius: 14px;

    background: #ffffff;

    box-shadow:
        0 5px 15px rgba(
            15,
            23,
            42,
            0.05
        );

    font-size: 1.25rem;

}


.mapping-item > span {

    margin-bottom: 4px;

    color: var(--yt-accent);

    font-size: 0.58rem;

    font-weight: 900;

    letter-spacing: 1px;

}


.mapping-item h3 {

    margin: 0;

    color: var(--yt-primary);

    font-family: "Poppins", sans-serif;

    font-size: 0.85rem;

}


.mapping-line {

    color: var(--yt-accent);

    font-size: 1.25rem;

    font-weight: 800;

}


.course-mapping-note {

    max-width: 900px;

    margin: 30px auto 0;

    padding: 18px 22px;

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

    border-radius: 12px;

    background: #eff6ff;

    color: #475569;

    font-size: 0.78rem;

    line-height: 1.7;

    text-align: center;

}


.course-mapping-note strong {

    color: var(--yt-primary);

}


/* =========================================================
   CONTENT MODEL
========================================================= */

.youtube-content-model {

    padding: 100px 20px;

    background: var(--yt-surface);

}


.content-model-grid {

    display: grid;

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

    gap: 18px;

}


.content-model-card {

    position: relative;

    min-height: 190px;

    padding: 30px;

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

    border-radius: 18px;

    background: #ffffff;

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

}


.content-model-card:hover {

    transform: translateY(-5px);

    box-shadow:
        0 18px 40px rgba(
            15,
            23,
            42,
            0.07
        );

}


.content-model-card > span {

    display: inline-flex;

    align-items: center;

    justify-content: center;

    width: 34px;

    height: 34px;

    margin-bottom: 20px;

    border-radius: 9px;

    background: #eff6ff;

    color: var(--yt-accent);

    font-size: 0.65rem;

    font-weight: 900;

}


.content-model-card h3 {

    margin: 0 0 10px;

    color: var(--yt-primary);

    font-family: "Poppins", sans-serif;

    font-size: 1rem;

}


.content-model-card p {

    margin: 0;

    color: var(--yt-muted);

    font-size: 0.76rem;

    line-height: 1.7;

}


/* =========================================================
   LATEST VIDEOS
========================================================= */

.youtube-latest {

    padding: 100px 20px;

    background: #ffffff;

}


.latest-video-grid {

    display: grid;

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

    gap: 20px;

}


.latest-video-card {

    overflow: hidden;

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

    border-radius: 18px;

    background: #ffffff;

    box-shadow:
        0 8px 25px rgba(
            15,
            23,
            42,
            0.04
        );

    transition:
        transform 0.3s ease,
        box-shadow 0.3s ease;

}


.latest-video-card:hover {

    transform: translateY(-7px);

    box-shadow:
        0 20px 45px rgba(
            15,
            23,
            42,
            0.1
        );

}


.video-thumbnail {

    position: relative;

    height: 205px;

    display: flex;

    align-items: center;

    justify-content: center;

    background:
        linear-gradient(
            135deg,
            #0f172a,
            #1e3a8a
        );

    overflow: hidden;

}


.video-thumbnail::before {

    content: "";

    position: absolute;

    width: 170px;

    height: 170px;

    border: 1px solid rgba(
        255,
        255,
        255,
        0.08
    );

    border-radius: 50%;

}


.video-thumbnail span {

    position: absolute;

    top: 15px;

    left: 16px;

    padding: 5px 8px;

    border-radius: 5px;

    background: rgba(
        255,
        255,
        255,
        0.1
    );

    color: #ffffff;

    font-size: 0.55rem;

    font-weight: 800;

    letter-spacing: 1px;

}


.video-play {

    position: relative;

    z-index: 2;

    width: 58px;

    height: 58px;

    display: flex;

    align-items: center;

    justify-content: center;

    border-radius: 50%;

    background: #ffffff;

    color: #dc2626;

    font-size: 1rem;

    box-shadow:
        0 10px 25px rgba(
            0,
            0,
            0,
            0.2
        );

}


.video-content {

    padding: 25px;

}


.video-category {

    display: block;

    margin-bottom: 8px;

    color: var(--yt-accent);

    font-size: 0.6rem;

    font-weight: 900;

    letter-spacing: 1px;

}


.video-content h3 {

    margin: 0 0 10px;

    color: var(--yt-primary);

    font-family: "Poppins", sans-serif;

    font-size: 1rem;

    line-height: 1.4;

}


.video-content p {

    margin: 0 0 18px;

    color: var(--yt-muted);

    font-size: 0.75rem;

    line-height: 1.65;

}


.video-content a {

    color: var(--yt-accent);

    font-size: 0.72rem;

    font-weight: 800;

    text-decoration: none;

}


.video-content a:hover {

    text-decoration: underline;

}


.latest-video-action {

    display: flex;

    justify-content: center;

    margin-top: 40px;

}


/* =========================================================
   FACULTY SUBMISSION WORKFLOW
========================================================= */

.youtube-submission {

    padding: 100px 20px;

    background: var(--yt-surface);

}


.submission-grid {

    display: grid;

    grid-template-columns:
        repeat(5, 1fr);

    gap: 15px;

}


.submission-step {

    position: relative;

    min-height: 220px;

    padding: 25px;

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

    border-radius: 18px;

    background: #ffffff;

    text-align: center;

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

}


.submission-step:hover {

    transform: translateY(-5px);

    box-shadow:
        0 18px 40px rgba(
            15,
            23,
            42,
            0.07
        );

}


.submission-step > span {

    position: absolute;

    top: 15px;

    right: 17px;

    color: #cbd5e1;

    font-size: 0.65rem;

    font-weight: 900;

}


.submission-step > div {

    width: 52px;

    height: 52px;

    display: flex;

    align-items: center;

    justify-content: center;

    margin: 15px auto 18px;

    border-radius: 14px;

    background: #eff6ff;

    font-size: 1.25rem;

}


.submission-step h3 {

    margin: 0 0 9px;

    color: var(--yt-primary);

    font-family: "Poppins", sans-serif;

    font-size: 0.95rem;

}


.submission-step p {

    margin: 0;

    color: var(--yt-muted);

    font-size: 0.72rem;

    line-height: 1.65;

}


/* =========================================================
   CHANNEL MANAGEMENT
========================================================= */

.youtube-management {

    padding: 100px 20px;

    background: #ffffff;

}


.management-box {

    display: grid;

    grid-template-columns:
        minmax(0, 1.15fr)
        minmax(300px, 0.85fr);

    gap: 50px;

    align-items: center;

    padding: 55px;

    border-radius: 24px;

    background:
        linear-gradient(
            135deg,
            #0f172a,
            #172554
        );

    box-shadow:
        0 25px 60px rgba(
            15,
            23,
            42,
            0.14
        );

    overflow: hidden;

}


.management-content .section-label {

    color: #93c5fd;

}


.management-content .section-label::before {

    background: #60a5fa;

}


.management-content h2 {

    margin: 0 0 20px;

    color: #ffffff;

    font-family: "Poppins", sans-serif;

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

    line-height: 1.15;

}


.management-content h2 span {

    display: block;

    color: #60a5fa;

}


.management-content > p:not(.section-label) {

    max-width: 650px;

    margin: 0;

    color: #cbd5e1;

    font-size: 0.88rem;

    line-height: 1.8;

}


.management-points {

    display: grid;

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

    gap: 10px;

    margin-top: 30px;

}


.management-points > div {

    padding: 17px;

    border: 1px solid rgba(
        255,
        255,
        255,
        0.1
    );

    border-radius: 12px;

    background: rgba(
        255,
        255,
        255,
        0.05
    );

}


.management-points strong {

    display: block;

    margin-bottom: 5px;

    color: #ffffff;

    font-size: 1.35rem;

}


.management-points span {

    display: block;

    color: #94a3b8;

    font-size: 0.6rem;

    line-height: 1.5;

}


.management-visual {

    display: flex;

    align-items: center;

    justify-content: center;

}


.management-circle {

    width: 270px;

    height: 270px;

    display: flex;

    flex-direction: column;

    align-items: center;

    justify-content: center;

    border: 1px solid rgba(
        255,
        255,
        255,
        0.12
    );

    border-radius: 50%;

    background:
        radial-gradient(
            circle,
            rgba(
                37,
                99,
                235,
                0.3
            ),
            rgba(
                255,
                255,
                255,
                0.03
            )
        );

    box-shadow:
        0 0 80px rgba(
            37,
            99,
            235,
            0.18
        );

}


.management-main-icon {

    width: 65px;

    height: 65px;

    display: flex;

    align-items: center;

    justify-content: center;

    margin-bottom: 15px;

    border-radius: 18px;

    background: #ffffff;

    color: #dc2626;

    font-size: 1.2rem;

}


.management-circle strong {

    color: #ffffff;

    font-family: "Poppins", sans-serif;

    font-size: 1.05rem;

}


.management-circle span {

    margin-top: 5px;

    color: #94a3b8;

    font-size: 0.6rem;

}


/* =========================================================
   CONTRIBUTION TRACKING
========================================================= */

.youtube-tracking {

    padding: 100px 20px;

    background: var(--yt-surface);

}


.tracking-grid {

    display: grid;

    grid-template-columns:
        repeat(5, 1fr);

    gap: 15px;

}


.tracking-card {

    padding: 30px 20px;

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

    border-radius: 17px;

    background: #ffffff;

    text-align: center;

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

}


.tracking-card:hover {

    transform: translateY(-5px);

    box-shadow:
        0 15px 35px rgba(
            15,
            23,
            42,
            0.07
        );

}


.tracking-card strong {

    display: block;

    margin-bottom: 8px;

    color: var(--yt-accent);

    font-family: "Poppins", sans-serif;

    font-size: 2rem;

}


.tracking-card span {

    color: var(--yt-muted);

    font-size: 0.65rem;

    line-height: 1.5;

}


/* =========================================================
   CHANNEL GROWTH
========================================================= */

.youtube-growth {

    padding: 100px 20px;

    background: #ffffff;

}


.growth-grid {

    display: grid;

    grid-template-columns:
        repeat(4, 1fr);

    gap: 18px;

}


.growth-card {

    position: relative;

    min-height: 220px;

    padding: 30px;

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

    border-radius: 18px;

    background:
        linear-gradient(
            145deg,
            #ffffff,
            #f8fafc
        );

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

}


.growth-card:hover {

    transform: translateY(-6px);

    box-shadow:
        0 18px 40px rgba(
            15,
            23,
            42,
            0.08
        );

}


.growth-card > span {

    display: block;

    margin-bottom: 22px;

    color: var(--yt-accent);

    font-size: 0.6rem;

    font-weight: 900;

    letter-spacing: 1px;

}


.growth-card h3 {

    margin: 0 0 12px;

    color: var(--yt-primary);

    font-family: "Poppins", sans-serif;

    font-size: 1rem;

}


.growth-card p {

    margin: 0;

    color: var(--yt-muted);

    font-size: 0.75rem;

    line-height: 1.7;

}


/* =========================================================
   ETHICAL MONETIZATION
========================================================= */

.youtube-monetization {

    padding: 100px 20px;

    background: var(--yt-surface);

}


.monetization-box {

    display: grid;

    grid-template-columns:
        minmax(0, 0.8fr)
        minmax(0, 1.2fr);

    gap: 55px;

    align-items: center;

    padding: 50px;

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

    border-radius: 24px;

    background: #ffffff;

    box-shadow:
        0 20px 50px rgba(
            15,
            23,
            42,
            0.06
        );

}


.monetization-box h2 {

    margin: 0 0 18px;

    color: var(--yt-primary);

    font-family: "Poppins", sans-serif;

    font-size: clamp(
        2rem,
        4vw,
        2.8rem
    );

    line-height: 1.15;

}


.monetization-box h2 span {

    display: block;

    color: var(--yt-accent);

}


.monetization-box > div:first-child > p:not(.section-label) {

    margin: 0;

    color: var(--yt-muted);

    font-size: 0.86rem;

    line-height: 1.8;

}


.monetization-items {

    display: grid;

    gap: 12px;

}


.monetization-items > div {

    display: grid;

    grid-template-columns:
        42px
        1fr;

    column-gap: 14px;

    padding: 18px;

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

    border-radius: 13px;

    background: var(--yt-surface);

}


.monetization-items span {

    grid-row: span 2;

    width: 34px;

    height: 34px;

    display: flex;

    align-items: center;

    justify-content: center;

    border-radius: 9px;

    background: #eff6ff;

    color: var(--yt-accent);

    font-size: 0.62rem;

    font-weight: 900;

}


.monetization-items strong {

    margin-bottom: 3px;

    color: var(--yt-primary);

    font-size: 0.82rem;

}


.monetization-items p {

    margin: 0;

    color: var(--yt-muted);

    font-size: 0.7rem;

    line-height: 1.6;

}


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

.youtube-cta {

    position: relative;

    padding: 110px 20px;

    overflow: hidden;

    text-align: center;

    background:
        linear-gradient(
            135deg,
            #f8fafc,
            #eff6ff
        );

}


.youtube-cta::before {

    content: "";

    position: absolute;

    width: 400px;

    height: 400px;

    top: -260px;

    left: 50%;

    transform: translateX(-50%);

    border-radius: 50%;

    background: rgba(
        37,
        99,
        235,
        0.08
    );

}


.youtube-cta > .youtube-container {

    position: relative;

    z-index: 2;

}


.youtube-cta h2 {

    margin: 0 0 18px;

    color: var(--yt-primary);

    font-family: "Poppins", sans-serif;

    font-size: clamp(
        2.2rem,
        5vw,
        3.6rem
    );

    line-height: 1.1;

}


.youtube-cta h2 span {

    color: var(--yt-accent);

}


.youtube-cta p:not(.section-label) {

    max-width: 700px;

    margin: 0 auto 30px;

    color: var(--yt-muted);

    font-size: 0.92rem;

    line-height: 1.8;

}


.youtube-cta-actions {

    display: flex;

    justify-content: center;

    flex-wrap: wrap;

    gap: 12px;

}


/* =========================================================
   FOOTER
========================================================= */

#site-footer {

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

    background: #ffffff;

}


#site-footer .youtube-container {

    padding-top: 32px;

    padding-bottom: 25px;

}


.footer-main {

    display: flex;

    align-items: center;

    justify-content: space-between;

    gap: 30px;

    padding-bottom: 25px;

}


.footer-main strong {

    display: block;

    margin-bottom: 5px;

    color: var(--yt-primary);

    font-family: "Poppins", sans-serif;

    font-size: 0.95rem;

}


.footer-main p {

    margin: 0;

    color: var(--yt-muted);

    font-size: 0.68rem;

}


.footer-main a {

    color: var(--yt-accent);

    font-size: 0.72rem;

    font-weight: 800;

    text-decoration: none;

}


.footer-main a:hover {

    text-decoration: underline;

}


.footer-bottom {

    padding-top: 20px;

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

    text-align: center;

}


.footer-bottom p {

    margin: 0;

    color: var(--yt-muted);

    font-size: 0.65rem;

}


/* =========================================================
   TABLET — 1100px
========================================================= */

@media (max-width: 1100px) {


    .youtube-hero > .youtube-container {

        grid-template-columns:
            minmax(0, 1fr)
            minmax(300px, 0.7fr);

        gap: 35px;

    }


    .contributors-grid {

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

    }


    .growth-grid {

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

    }


    .tracking-grid {

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

    }


    .submission-grid {

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

    }


    .course-mapping-flow {

        grid-template-columns:
            repeat(5, 1fr);

    }


    .course-mapping-flow .mapping-line {

        display: none;

    }

}


/* =========================================================
   TABLET — 900px
========================================================= */

@media (max-width: 900px) {


    .youtube-hero {

        min-height: auto;

        padding-top: 85px;

    }


    .youtube-hero > .youtube-container {

        grid-template-columns: 1fr;

    }


    .youtube-channel-card {

        max-width: 560px;

    }


    .youtube-introduction-grid {

        grid-template-columns: 1fr;

        gap: 35px;

    }


    .youtube-system-grid {

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

    }


    .system-arrow {

        display: none;

    }


    .youtube-area-grid {

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

    }


    .content-model-grid {

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

    }


    .latest-video-grid {

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

    }


    .management-box {

        grid-template-columns: 1fr;

        padding: 40px;

    }


    .management-visual {

        padding-top: 10px;

    }


    .monetization-box {

        grid-template-columns: 1fr;

        gap: 35px;

        padding: 40px;

    }

}


/* =========================================================
   MOBILE — 650px
========================================================= */

@media (max-width: 650px) {


    .youtube-page .youtube-container {

        padding-left: 16px;

        padding-right: 16px;

    }


    .youtube-hero {

        padding: 70px 16px;

    }


    .youtube-hero h1 {

        font-size: 2.65rem;

        letter-spacing: -1.2px;

    }


    .youtube-hero-description {

        font-size: 0.9rem;

        line-height: 1.75;

    }


    .youtube-hero-actions {

        flex-direction: column;

        align-items: stretch;

    }


    .youtube-page .btn {

        width: 100%;

    }


    .youtube-stats {

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

        margin-top: 35px;

    }


    .youtube-stat {

        padding: 18px 12px;

        border-bottom: 1px solid rgba(
            15,
            23,
            42,
            0.08
        );

    }


    .youtube-stat:nth-child(2) {

        border-right: none;

    }


    .youtube-stat:nth-child(3) {

        border-bottom: none;

    }


    .youtube-stat:nth-child(4) {

        border-right: none;

        border-bottom: none;

    }


    .channel-card-meta {

        grid-template-columns:
            1fr;

    }


    .youtube-introduction,
    .youtube-system,
    .youtube-areas,
    .youtube-contributors,
    .youtube-course-mapping,
    .youtube-content-model,
    .youtube-latest,
    .youtube-submission,
    .youtube-management,
    .youtube-tracking,
    .youtube-growth,
    .youtube-monetization,
    .youtube-cta {

        padding-top: 75px;

        padding-bottom: 75px;

    }


    .youtube-page .section-heading {

        margin-bottom: 35px;

    }


    .youtube-page .section-heading h2 {

        font-size: 2rem;

    }


    .youtube-system-grid {

        grid-template-columns: 1fr;

    }


    .youtube-area-grid {

        grid-template-columns: 1fr;

    }


    .contributors-grid {

        grid-template-columns: 1fr;

    }


    .course-mapping-flow {

        grid-template-columns: 1fr;

        gap: 12px;

    }


    .mapping-item {

        min-height: 135px;

    }


    .mapping-line {

        display: none;

    }


    .content-model-grid {

        grid-template-columns: 1fr;

    }


    .latest-video-grid {

        grid-template-columns: 1fr;

    }


    .submission-grid {

        grid-template-columns: 1fr;

    }


    .tracking-grid {

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

    }


    .tracking-card:last-child {

        grid-column: span 2;

    }


    .growth-grid {

        grid-template-columns: 1fr;

    }


    .management-box {

        padding: 30px 22px;

        border-radius: 18px;

    }


    .management-points {

        grid-template-columns: 1fr;

    }


    .management-circle {

        width: 220px;

        height: 220px;

    }


    .monetization-box {

        padding: 30px 22px;

        border-radius: 18px;

    }


    .youtube-cta-actions {

        flex-direction: column;

    }


    .footer-main {

        flex-direction: column;

        align-items: flex-start;

    }

}


/* =========================================================
   SMALL MOBILE — 420px
========================================================= */

@media (max-width: 420px) {


    .youtube-hero h1 {

        font-size: 2.25rem;

    }


    .youtube-channel-card {

        border-radius: 17px;

    }


    .channel-card-top,
    .channel-card-body {

        padding-left: 20px;

        padding-right: 20px;

    }


    .channel-card-button {

        padding-left: 20px;

        padding-right: 20px;

    }


    .youtube-stat strong {

        font-size: 1.25rem;

    }


    .tracking-grid {

        grid-template-columns: 1fr;

    }


    .tracking-card:last-child {

        grid-column: auto;

    }


    .management-circle {

        width: 190px;

        height: 190px;

    }


}


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

.youtube-page a:focus-visible,
.youtube-page button:focus-visible {

    outline: 3px solid rgba(
        37,
        99,
        235,
        0.35
    );

    outline-offset: 3px;

}


/* =========================================================
   REDUCED MOTION
========================================================= */

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

    .youtube-page *,
    .youtube-page *::before,
    .youtube-page *::after {

        scroll-behavior: auto !important;

        transition: none !important;

        animation: none !important;

    }

}