* {
    box-sizing: border-box;
    transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(18px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes shine {
    from {
        transform: translateX(-120%) rotate(12deg);
    }
    to {
        transform: translateX(220%) rotate(12deg);
    }
}

body {
    margin: 0;
    min-height: 100vh;
    color: #e5e5e5;
    font-family: 'Inter', sans-serif;
    background:
        radial-gradient(circle at top left, rgba(79, 195, 247, 0.16), transparent 34%),
        radial-gradient(circle at bottom right, rgba(129, 199, 132, 0.13), transparent 30%),
        linear-gradient(135deg, #0a0a0a 0%, #1a1a2e 100%);
    padding: 26px 20px 54px;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

.page-shell {
    width: min(1120px, 100%);
    margin: 0 auto;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    animation: fadeUp 0.7s ease-out;
}

.brand {
    color: #4fc3f7;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
}

.back-btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0 18px;
    border: 2px solid #4fc3f7;
    border-radius: 8px;
    color: #4fc3f7;
    font-weight: 700;
    overflow: hidden;
}

.back-btn::before {
    content: '';
    position: absolute;
    inset: 0 auto 0 -70%;
    width: 55%;
    background: linear-gradient(90deg, transparent, rgba(79, 195, 247, 0.55), transparent);
    transform: skewX(-18deg);
}

.back-btn:hover::before,
.back-btn:focus-visible::before {
    animation: shine 0.65s ease;
}

.back-btn:hover,
.back-btn:focus-visible {
    background: #4fc3f7;
    color: #0a0a0a;
    box-shadow: 0 0 22px rgba(79, 195, 247, 0.52);
    outline: none;
}

.hero {
    padding: 74px 0 42px;
    animation: fadeUp 0.8s ease-out 0.08s backwards;
}

.eyebrow {
    color: #81c784;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 14px;
}

h1 {
    max-width: 780px;
    margin: 0;
    font-family: 'Poppins', sans-serif;
    font-size: clamp(2.25rem, 7vw, 4.6rem);
    line-height: 1.02;
    background: linear-gradient(135deg, #4fc3f7, #81c784);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.intro {
    max-width: 660px;
    margin: 20px 0 0;
    color: #99a8b8;
    font-size: clamp(0.95rem, 2vw, 1.06rem);
    line-height: 1.7;
}

.collage {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 26px;
    align-items: start;
}

.section-panel {
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(79, 195, 247, 0.17);
    border-radius: 16px;
    background: rgba(26, 26, 46, 0.58);
    box-shadow: 0 18px 44px rgba(0, 0, 0, 0.24);
    animation: fadeUp 0.8s ease-out 0.2s backwards;
}

.multimedia-panel {
    grid-column: 1 / -1;
}

.section-panel::after {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: linear-gradient(135deg, rgba(79, 195, 247, 0.08), transparent 42%, rgba(129, 199, 132, 0.08));
}

.section-header {
    position: relative;
    z-index: 1;
    padding: 26px 28px 8px;
}

.section-header h2 {
    margin: 0;
    color: #4fc3f7;
    font-family: 'Poppins', sans-serif;
    font-size: clamp(1.35rem, 3vw, 2rem);
}

.section-header p {
    max-width: 570px;
    margin: 8px 0 0;
    color: #99a8b8;
    line-height: 1.6;
}

.browser-grid {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    padding: 24px 28px 30px;
}

.multimedia-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.browser-card {
    position: relative;
    min-height: 210px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 22px 16px;
    border: 1px solid rgba(79, 195, 247, 0.18);
    border-radius: 14px;
    background: rgba(10, 10, 10, 0.36);
    outline: none;
    overflow: hidden;
}

.browser-card::before {
    content: '';
    position: absolute;
    inset: -1px;
    opacity: 0;
    background: linear-gradient(135deg, rgba(79, 195, 247, 0.18), rgba(129, 199, 132, 0.16));
}

.browser-card:hover,
.browser-card:focus-visible {
    transform: translateY(-8px) scale(1.02);
    border-color: rgba(79, 195, 247, 0.7);
    box-shadow: 0 14px 32px rgba(79, 195, 247, 0.18);
}

.browser-card:hover::before,
.browser-card:focus-visible::before {
    opacity: 1;
}

.browser-card:active {
    transform: translateY(-2px) scale(0.98);
}

.icon-stage {
    position: relative;
    z-index: 1;
    width: 96px;
    height: 96px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: #f4fbff;
    box-shadow: 0 0 0 8px rgba(79, 195, 247, 0.08), 0 14px 26px rgba(0, 0, 0, 0.28);
}

.browser-card:hover .icon-stage,
.browser-card:focus-visible .icon-stage {
    transform: rotate(-5deg) scale(1.08);
    box-shadow: 0 0 0 10px rgba(129, 199, 132, 0.11), 0 18px 34px rgba(79, 195, 247, 0.22);
}

.icon-stage img {
    width: 62px;
    height: 62px;
    object-fit: contain;
}

.browser-name {
    position: relative;
    z-index: 1;
    color: #e5e5e5;
    font-size: 1rem;
    font-weight: 800;
    text-align: center;
}

.download-label {
    position: relative;
    z-index: 1;
    color: #81c784;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.side-stack {
    display: grid;
    gap: 26px;
}

.mini-panel {
    min-height: 176px;
    padding: 26px;
    border: 1px solid rgba(79, 195, 247, 0.15);
    border-radius: 16px;
    background: rgba(22, 33, 62, 0.48);
    animation: fadeUp 0.8s ease-out 0.32s backwards;
}

.mini-panel h3 {
    margin: 0 0 12px;
    color: #81c784;
    font-family: 'Poppins', sans-serif;
    font-size: 1.2rem;
}

.mini-panel p {
    margin: 0;
    color: #99a8b8;
    line-height: 1.6;
}

.status-line {
    width: 100%;
    height: 2px;
    margin-top: 22px;
    background: linear-gradient(90deg, #4fc3f7, #81c784, transparent);
    border-radius: 99px;
}

@media (max-width: 860px) {
    .collage {
        grid-template-columns: 1fr;
    }

    .multimedia-panel {
        grid-column: auto;
    }

    .browser-grid {
        grid-template-columns: repeat(3, minmax(130px, 1fr));
        overflow-x: auto;
    }

    .multimedia-grid {
        grid-template-columns: repeat(4, minmax(130px, 1fr));
    }
}

@media (max-width: 620px) {
    body {
        padding: 20px 14px 38px;
    }

    .topbar {
        align-items: flex-start;
        flex-direction: column;
    }

    .back-btn {
        width: 100%;
    }

    .hero {
        padding: 48px 0 30px;
    }

    .section-header {
        padding: 22px 20px 6px;
    }

    .browser-grid {
        grid-template-columns: 1fr;
        padding: 20px;
    }

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

    .browser-card {
        min-height: 184px;
    }

    .mini-panel {
        padding: 22px 20px;
    }
}