:root {
    --irrv-info: #0dcaf0;
    --irrv-info-dark: #0891b2;
    --irrv-navy: #0f172a;
    --irrv-slate: #475569;
}

/* GLOBAL */
html {
    scroll-behavior: smooth;
}

body {
    background:
        radial-gradient(circle at top right, rgba(13, 202, 240, .18), transparent 25%),
        linear-gradient(180deg, #ffffff 0%, #f8fcff 55%, #f5fbfd 100%);
    color: var(--irrv-navy);
    padding-top: 88px;
}

/* NAVBAR */
.navbar {
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 30px rgba(15, 23, 42, .12);
}

.navbar.bg-info {
    background: linear-gradient(90deg, #0dcaf0 0%, #38bdf8 55%, #67e8f9 100%) !important;
}

.navbar .nav-link {
    font-weight: 600;
    transition: all .25s ease;
}

.navbar .nav-link:hover {
    transform: translateY(-1px);
}

/* HERO */
.hero {
    position: relative;
    border-radius: 2rem;
    padding: 5rem 1.5rem 4rem;
    margin-top: 1.5rem;
    background:
        linear-gradient(135deg, rgba(13, 202, 240, .12), rgba(255,255,255,.95));
    box-shadow: 0 20px 45px rgba(15, 23, 42, .08);
    text-align: center;
}

.hero-title {
    font-size: clamp(2.25rem, 5vw, 4rem);
    font-weight: 800;
}

.hero-lead {
    color: var(--irrv-slate);
    max-width: 900px;
    margin: auto;
}

.btn-glow {
    border-radius: 999px;
    font-weight: 700;
    box-shadow: 0 12px 24px rgba(13, 202, 240, .22);
}

/* SECTION */
.section-heading {
    font-size: 2rem;
    font-weight: 800;
}

.section-subheading {
    color: var(--irrv-slate);
    max-width: 700px;
    margin: auto;
}

.divider {
    width: 90px;
    height: 4px;
    margin: 1rem auto;
    background: linear-gradient(90deg, var(--irrv-info), #67e8f9);
}

/* VIDEO CARDS */
.video-card {
    background: #fff;
    border-radius: 1.4rem;
    padding: 1rem;
    box-shadow: 0 14px 35px rgba(15, 23, 42, .06);
    transition: .25s;
}

.video-card:hover {
    transform: translateY(-6px);
}

.video-role {
    color: var(--irrv-info-dark);
}

/* STUDENTS */
.student-card {
    text-align: center;
    padding: 1rem;
    background: #fff;
    border-radius: 1rem;
    transition: .25s;
}

.student-card:hover {
    transform: translateY(-4px);
}

.student-avatar {
    width: 100px;
    height: 100px;
    object-fit: cover;
    border-radius: 0.75rem;
    border: 3px solid rgba(13, 202, 240, .25);
}

.student-name .btn {
    border-radius: 999px;
    margin-top: 10px;
}

/* CUSTOM BUTTON */
.btn-purple {
    color: #fff;
    background-color: #7c3aed;
}

/* CONTACT STRIP */
.contact-strip {
    margin-top: 2rem;
    padding: 1.25rem 1.5rem;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(13, 202, 240, 0.12);
    border-radius: 1rem;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
}

.contact-strip-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.9rem;
    height: 100%;
    text-align: left;
}

.contact-strip-icon {
    width: 48px;
    height: 48px;
    flex: 0 0 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(13, 202, 240, 0.12);
    color: var(--irrv-info-dark);
    font-size: 1.1rem;
}

.contact-strip-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--irrv-info-dark);
    margin-bottom: 0.15rem;
}

.contact-strip-text {
    margin: 0;
    color: var(--irrv-navy);
    line-height: 1.5;
}

.contact-strip-text a {
    color: #1fc1ea;
    text-decoration: none;
    font-weight: 700;
}

.contact-strip-text a:hover {
    text-decoration: underline;
}

.contact-strip-divider {
    border-left: 1px solid rgba(13, 202, 240, 0.15);
}

footer {
    color: var(--irrv-slate);
    text-align: center;
}



@media (max-width: 767.98px) {
    .contact-strip {
        padding: 1rem;
    }

    .contact-strip-item {
        justify-content: flex-start;
        text-align: left;
    }

    .contact-strip-divider {
        border-left: 0;
        border-top: 1px solid rgba(13, 202, 240, 0.15);
        padding-top: 1rem;
        margin-top: 1rem;
    }
}

/* MOBILE */
@media (max-width: 768px) {
    body {
        padding-top: 82px;
    }

    .hero {
        padding: 3rem 1rem;
    }
}