/* =========================================================
   BVO Elektronik Case Study Page
   Brand vibe: industrial electronics — petrol blue + orange accent
   ========================================================= */

:root {
    --bvo-ink: #0A2A38;
    --bvo-petrol: #0F4256;
    --bvo-petrol-2: #1A6480;
    --bvo-orange: #C8631E;
    --bvo-orange-2: #E8852E;
    --bvo-amber: #F2A23B;
    --bvo-soft: #F2F5F7;
    --bvo-card: #FFFFFF;
    --bvo-muted: #5F7280;
    --bvo-font: 'Inter', 'Manrope', 'Segoe UI', sans-serif;
    --bvo-display-font: 'Rajdhani', 'Orbitron', 'Inter', 'Segoe UI', sans-serif;
}

.bvo-hero,
.bvo-intro,
.bvo-feature,
.bvo-social,
.bvo-other-brands {
    font-family: var(--bvo-font);
}

/* ---------- 1. HERO ---------- */
.bvo-hero {
    position: relative;
    width: 100%;
    height: 100vh;
    min-height: 520px;
    overflow: hidden;
    background: var(--bvo-ink);
}

.bvo-hero__video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
}

.bvo-hero__overlay {
    position: absolute;
    inset: 0;
    z-index: 2;
    display: flex;
    align-items: flex-end;
    padding-bottom: clamp(2.5rem, 7vw, 7rem);
    color: #fff;
    background:
        radial-gradient(circle at 78% 18%, rgba(200,99,30,0.22) 0%, transparent 38%),
        linear-gradient(180deg, rgba(10,42,56,0.10) 28%, rgba(10,42,56,0.78) 100%);
}

.bvo-hero__brand-card {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 22px 28px;
    border-radius: 14px;
    background: rgba(255,255,255,0.96);
    box-shadow: 0 18px 44px rgba(0,0,0,0.34);
    margin-bottom: 1.5rem;
}

.bvo-hero__logo {
    max-width: 260px;
    max-height: 86px;
    object-fit: contain;
    display: block;
}

.bvo-hero h1 {
    color: #fff;
    font-family: var(--bvo-display-font);
    font-size: clamp(3rem, 8vw, 6.8rem);
    font-weight: 700;
    line-height: 1.0;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    margin: 0 0 1rem;
    text-shadow: 0 12px 32px rgba(0,0,0,0.35);
}

.bvo-hero h1 em {
    color: var(--bvo-orange-2);
    font-style: normal;
    font-weight: 700;
}

.bvo-hero__subtitle {
    color: rgba(255,255,255,0.86);
    font-size: clamp(1rem, 1.6vw, 1.3rem);
    line-height: 1.65;
    max-width: 680px;
    margin: 0;
}

@media (max-width: 768px) {
    .bvo-hero { height: 72vh; min-height: 470px; }
    .bvo-hero__overlay { padding-bottom: 2.6rem; }
}

/* ---------- 2. INTRO ---------- */
.bvo-intro {
    position: relative;
    background: var(--bvo-soft);
    color: var(--bvo-ink);
    padding: clamp(4rem, 7vw, 7rem) 0;
    overflow: hidden;
}

.bvo-intro::before {
    content: '';
    position: absolute;
    top: -160px;
    right: -120px;
    width: 420px;
    height: 420px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(200,99,30,0.13), transparent 70%);
    pointer-events: none;
}

.bvo-intro__text {
    position: relative;
    z-index: 2;
    max-width: 980px;
    font-size: clamp(1.1rem, 2vw, 1.65rem);
    line-height: 1.7;
    color: #1F2A40;
    font-weight: 500;
}

.bvo-intro__text strong {
    color: var(--bvo-orange);
    font-weight: 800;
}

/* ---------- Section headers ---------- */
.bvo-section-head {
    max-width: 760px;
    margin: 0 auto clamp(2rem, 4vw, 3.5rem);
    text-align: center;
}

.bvo-section-head span {
    display: inline-flex;
    align-items: center;
    padding: 7px 13px;
    border-radius: 999px;
    background: rgba(200,99,30,0.12);
    color: var(--bvo-orange);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.bvo-section-head h2 {
    color: var(--bvo-ink);
    font-family: var(--bvo-display-font);
    font-size: clamp(2rem, 5vw, 4.2rem);
    font-weight: 700;
    letter-spacing: 0.01em;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.bvo-section-head p {
    color: var(--bvo-muted);
    line-height: 1.75;
    margin: 0;
}

.bvo-section-head--light span {
    background: rgba(232,133,46,0.20);
    color: var(--bvo-amber);
}

.bvo-section-head--light h2,
.bvo-section-head--light p {
    color: #fff;
}

.bvo-section-head--light p {
    color: rgba(255,255,255,0.72);
}

/* ---------- 3. FEATURE / KEY VISUAL ---------- */
.bvo-feature {
    position: relative;
    background:
        radial-gradient(circle at 80% 10%, rgba(200,99,30,0.22), transparent 32%),
        linear-gradient(180deg, var(--bvo-petrol) 0%, var(--bvo-ink) 100%);
    padding: clamp(5rem, 8vw, 9rem) 0;
    overflow: hidden;
}

.bvo-feature__frame {
    border-radius: 24px;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,0.12);
    box-shadow: 0 28px 80px rgba(0,0,0,0.42);
    background: #000;
    max-width: 1200px;
    margin: 0 auto;
}

.bvo-feature__frame video,
.bvo-feature__frame img {
    width: 100%;
    display: block;
    object-fit: cover;
}

.bvo-feature__frame video {
    aspect-ratio: 16 / 9;
}

/* ---------- 4. SOCIAL ---------- */
.bvo-social {
    background: #fff;
    padding: clamp(5rem, 8vw, 9rem) 0;
}

.bvo-social-masonry {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    max-width: 1520px;
    margin: 0 auto;
    padding: 0 clamp(15px, 3vw, 30px);
}

.bvo-social-col {
    flex: 1;
    min-width: 250px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.bvo-social-col img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 16px;
    background: var(--bvo-soft);
    box-shadow: 0 8px 22px rgba(10,42,56,0.08);
    transition: transform .35s ease, box-shadow .35s ease;
}

.bvo-social-col img:hover {
    transform: translateY(-7px);
    box-shadow: 0 22px 44px rgba(10,42,56,0.20);
}

@media (max-width: 600px) {
    .bvo-social-col { min-width: 100%; }
}

/* ---------- OTHER BRANDS ---------- */
.bvo-other-brands {
    background: var(--bvo-soft);
    padding: clamp(5rem, 8vw, 10rem) 0;
}

.bvo-other-title {
    color: var(--bvo-ink);
    font-family: var(--bvo-display-font);
    font-weight: 700;
    font-size: clamp(2rem, 4vw, 3.4rem);
    letter-spacing: 0.01em;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.bvo-other-card {
    min-height: clamp(170px, 24vw, 260px);
    border-radius: 18px;
    background: #fff;
    border: 1px solid rgba(10,42,56,0.06);
    color: var(--bvo-ink);
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-weight: 800;
    letter-spacing: 0.12em;
    transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease, color .3s ease;
}

.bvo-other-card:hover {
    transform: translateY(-7px);
    color: var(--bvo-orange);
    border-color: rgba(200,99,30,0.28);
    box-shadow: 0 18px 42px rgba(10,42,56,0.10);
}

.bvo-back {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 1rem 1.9rem;
    border-radius: 999px;
    background: var(--bvo-petrol);
    color: #fff;
    text-decoration: none;
    font-weight: 800;
    transition: transform .25s ease, background .25s ease, color .25s ease;
}

.bvo-back:hover {
    background: var(--bvo-orange);
    color: #fff;
    transform: translateY(-2px);
}

@media (prefers-reduced-motion: reduce) {
    .bvo-social-col img,
    .bvo-other-card { transition: none !important; }
}