/* ==========================================================================
   PARTICIPATE PAGE STYLES
   Fluent BCI Study Participation
   ========================================================================== */

/* --- HERO SECTION --- */
.participate-hero {
    min-height: 70vh;
    width: 100%;
    display: flex;
    align-items: center;
    padding: 0 5%;
    box-sizing: border-box;
    background-color: var(--fluent-bg);
    color: var(--fluent-text-main);
}

.participate-hero .hero-grid-align {
    align-items: start !important;
    padding-top: 150px;
}

.participate-hero .hero-heading {
    margin: 0;
    font-family: 'Raleway', sans-serif;
    font-size: 48px;
    font-weight: 600;
    line-height: 1.1;
    letter-spacing: -0.03em;
    background: linear-gradient(90deg, var(--fluent-blue), var(--fluent-green), var(--fluent-yellow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    display: inline;
    -webkit-box-decoration-break: clone;
    box-decoration-break: clone;
}

.participate-hero .hero-cta-copy {
    font-family: 'Inter', sans-serif;
    font-size: 36px;
    font-weight: 400;
    line-height: 1.35;
    letter-spacing: -0.02em;
    color: var(--fluent-text-main);
    margin: 0;
}

/* --- SECTION FOUNDATIONS --- */
.participate-section {
    padding: 100px 5%;
    box-sizing: border-box;
}

.participate-section.white-bg {
    background-color: #ffffff;
    color: var(--fluent-text-dark);
}

.participate-section.light-bg {
    background-color: var(--fluent-bg-light);
    color: var(--fluent-text-dark);
}

.participate-section.dark-bg {
    background-color: var(--fluent-bg);
    color: var(--fluent-text-main);
}

/* --- INTRO / CENTERED HEADLINE --- */
.participate-intro-container {
    max-width: 900px;
    margin: 0 auto 60px;
    text-align: center;
}

.participate-intro-heading {
    font-family: 'Raleway', sans-serif;
    font-size: 44px;
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: #111111;
    margin: 0;
}

/* --- TWO-COLUMN STUDIES GRID --- */
.participate-grid.two-col-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 36px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.study-card {
    background-color: #ffffff;
    padding: 40px;
    border-radius: 8px;
    color: #111111;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
    border: 1px solid rgba(0, 0, 0, 0.06);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.study-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.08);
    border-color: rgba(var(--fluent-blue-rgb), 0.25);
}

.study-card-title {
    font-family: 'Raleway', sans-serif;
    font-size: 24px;
    font-weight: 600;
    color: #111111;
    margin: 0 0 16px 0;
    line-height: 1.25;
    letter-spacing: -0.02em;
}

.study-card-lead {
    font-family: 'Inter', sans-serif;
    font-size: 16px;
    font-weight: 500;
    line-height: 1.6;
    color: #111111;
    margin: 0 0 12px 0;
}

.study-criteria-list {
    list-style-type: disc;
    padding-left: 20px;
    margin: 0 0 24px 0;
}

.study-criteria-list li {
    font-family: 'Inter', sans-serif;
    font-size: 15px;
    line-height: 1.6;
    color: rgba(17, 17, 17, 0.75);
    margin-bottom: 8px;
}

.study-criteria-list li:last-child {
    margin-bottom: 0;
}

.study-card-text {
    font-family: 'Inter', sans-serif;
    font-size: 15px;
    line-height: 1.6;
    color: rgba(17, 17, 17, 0.75);
    margin: 0 0 24px 0;
}

.study-card-footer {
    margin-top: auto;
    padding-top: 24px;
}

.study-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 4px;
}

/* --- HIGH-DENSITY EEG STUDY SECTION --- */
.hd-study-section {
    scroll-margin-top: 90px;
}

.hd-study-container {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.hd-study-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hd-study-heading {
    font-family: 'Raleway', sans-serif;
    font-size: 44px;
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: #111111;
    margin: 0 0 24px 0;
}

.hd-criteria-lead {
    font-family: 'Inter', sans-serif;
    font-size: 18px;
    font-weight: 600;
    line-height: 1.5;
    color: #111111;
    margin: 0 0 16px 0;
}

.hd-criteria-list {
    list-style-type: disc;
    padding-left: 20px;
    margin: 0 0 28px 0;
}

.hd-criteria-list li {
    font-family: 'Inter', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: rgba(17, 17, 17, 0.85);
    margin-bottom: 12px;
}

.hd-criteria-list li:last-child {
    margin-bottom: 0;
}

.hd-reimbursement {
    font-family: 'Inter', sans-serif;
    font-size: 16px;
    font-weight: 500;
    line-height: 1.5;
    color: #111111;
    margin: 0;
    padding: 14px 18px;
    background-color: rgba(var(--fluent-blue-rgb), 0.08);
    border-left: 3px solid var(--fluent-blue);
    border-radius: 0 6px 6px 0;
}

.hd-cta-wrapper {
    margin-top: 28px;
}

.hd-register-btn {
    padding: 12px 28px;
}

.hd-study-images-col {
    width: 100%;
}

.hd-staggered-wrapper {
    position: relative;
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    padding-bottom: 20px;
}

.hd-stagger-card {
    border-radius: 14px;
    overflow: hidden;
    background-color: #ffffff;
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.09);
    border: 4px solid #ffffff;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hd-card-top {
    width: 72%;
    position: relative;
    z-index: 1;
}

.hd-card-bottom {
    width: 72%;
    margin-left: auto;
    margin-top: -90px;
    position: relative;
    z-index: 2;
    box-shadow: 0 18px 44px rgba(0, 0, 0, 0.13);
}

.hd-stagger-card:hover {
    transform: translateY(-4px);
    z-index: 3;
    box-shadow: 0 22px 50px rgba(0, 0, 0, 0.16);
}

.hd-stagger-card img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
}

/* --- DOUBLE YOUR IMPACT SECTION --- */
.impact-section {
    border-top: 1px solid rgba(0, 0, 0, 0.07);
    padding: 100px 5%;
}

.impact-container {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.impact-grid {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: 60px;
    align-items: center;
}

.impact-image-col {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
}

.impact-logo-wrapper {
    max-width: 280px;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.impact-logo-wrapper img {
    width: 100%;
    max-width: 280px;
    height: auto;
    display: block;
    object-fit: contain;
    background: transparent;
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.06));
}

.impact-content-col {
    width: 100%;
}

.impact-heading {
    font-family: 'Raleway', sans-serif;
    font-size: 44px;
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: #111111;
    margin: 0 0 20px 0;
}

.impact-text {
    font-family: 'Inter', sans-serif;
    font-size: 20px;
    font-weight: 400;
    line-height: 1.6;
    color: rgba(17, 17, 17, 0.85);
    margin: 0;
}

/* ==========================================================================
   MOBILE RESPONSIVE
   ========================================================================== */
@media (max-width: 900px) {
    .participate-hero {
        min-height: auto;
        padding: 130px 5% 60px;
    }

    .participate-hero .hero-grid-align {
        padding-top: 0;
        gap: 30px;
    }

    .participate-hero .hero-heading {
        font-size: 32px;
    }

    .participate-hero .hero-cta-copy {
        font-size: 24px;
        line-height: 1.35;
    }

    .participate-section {
        padding: 70px 5%;
    }

    .participate-intro-container {
        margin-bottom: 36px;
    }

    .participate-intro-heading {
        font-size: 28px;
        line-height: 1.25;
    }

    .participate-grid.two-col-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .study-card {
        padding: 28px 20px;
    }

    .study-card-title {
        font-size: 20px;
    }

    .hd-study-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hd-study-heading {
        font-size: 32px;
        margin-bottom: 20px;
    }

    .hd-criteria-lead {
        font-size: 17px;
    }

    .hd-staggered-wrapper {
        max-width: 380px;
    }

    .hd-card-top {
        width: 74%;
    }

    .hd-card-bottom {
        width: 74%;
        margin-top: -65px;
    }

    .impact-section {
        padding: 70px 5%;
    }

    .impact-grid {
        grid-template-columns: 1fr;
        gap: 32px;
        text-align: center;
    }

    .impact-content-col {
        order: 1;
    }

    .impact-image-col {
        order: 2;
    }

    .impact-logo-wrapper {
        max-width: 200px;
        margin: 0 auto;
    }

    .impact-heading {
        font-size: 32px;
        margin-bottom: 16px;
    }

    .impact-text {
        font-size: 18px;
    }
}

@media (max-width: 480px) {
    .participate-hero {
        padding: 120px 5% 50px;
    }

    .participate-hero .hero-heading {
        font-size: 30px;
    }

    .participate-hero .hero-cta-copy {
        font-size: 22px;
    }

    .participate-section {
        padding: 60px 5%;
    }

    .participate-intro-heading {
        font-size: 26px;
    }

    .study-card {
        padding: 24px 18px;
    }

    .study-btn {
        width: 100%;
        box-sizing: border-box;
        text-align: center;
    }

    .hd-study-heading {
        font-size: 28px;
    }

    .hd-register-btn {
        width: 100%;
        box-sizing: border-box;
        text-align: center;
    }

    .hd-staggered-wrapper {
        max-width: 320px;
    }

    .hd-card-bottom {
        margin-top: -55px;
    }

    .impact-heading {
        font-size: 28px;
    }

    .impact-text {
        font-size: 16px;
    }

    .impact-logo-wrapper {
        max-width: 170px;
    }
}