/* =========================================
   VSS ROOT VARIABLES & RESET
========================================= */
.vss-wrapper {
    --vss-font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --vss-black: #111111;
    --vss-white: #ffffff;
    --vss-yellow: #ffb800;
    --vss-cyan: #d6f5f5;
    --vss-magenta: #ff007f;
    --vss-gray: #888888;
    --vss-light-gray: #f5f5f5;

    --vss-space-sm: 1rem;
    --vss-space-md: 2rem;
    --vss-space-lg: 4rem;
    --vss-space-xl: 8rem;

    font-family: var(--vss-font);
    color: var(--vss-black);
    background: var(--vss-white);
    line-height: 1.5;
    overflow-x: hidden;
}

.vss-wrapper * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* =========================================
   LAYOUT & CONTAINERS
========================================= */
.vss-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--vss-space-md);
}

.vss-section {
    padding: var(--vss-space-xl) 0;
}

.vss-bg-yellow {
    background-color: var(--vss-yellow);
}

.vss-bg-gray {
    background-color: var(--vss-gray);
    color: var(--vss-white);
}

.vss-bg-cyan {
    background-color: var(--vss-cyan);
}

.vss-bg-magenta {
    background-color: var(--vss-magenta);
    color: var(--vss-white);
}

.vss-mt-large {
    margin-top: var(--vss-space-lg);
}

.vss-mb-large {
    margin-bottom: var(--vss-space-lg);
}

/* =========================================
   TYPOGRAPHY
========================================= */
.vss-title-xl {
    font-size: clamp(3rem, 6vw, 5.5rem);
    font-weight: 500;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: var(--vss-space-md);
}

.vss-title-lg {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 500;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.vss-title-md {
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    font-weight: 500;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.vss-dot {
    color: var(--vss-yellow);
}

/* =========================================
   COMPONENTS (HERO, BUTTONS, CARDS)
========================================= */
.vss-hero__inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--vss-space-lg);
    align-items: center;
    min-height: 80vh;
}

.vss-hero__desc {
    font-size: 1.125rem;
    max-width: 80%;
    margin-bottom: var(--vss-space-md);
    color: #555;
}

.vss-blob-placeholder {
    width: 100%;
    aspect-ratio: 1;
    background-color: var(--vss-yellow);
    border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%;
    animation: vss-morph 8s ease-in-out infinite;
}

@keyframes vss-morph {

    0%,
    100% {
        border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%;
    }

    50% {
        border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
    }
}

.vss-btn {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.vss-btn--outline {
    border: 1px solid var(--vss-black);
    color: var(--vss-black);
}

.vss-btn--outline:hover {
    background: var(--vss-black);
    color: var(--vss-white);
}

/* =========================================
   GRIDS
========================================= */
.vss-header-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--vss-space-lg);
}

.vss-grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--vss-space-md);
}

.vss-grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1px;
    /* border hack */
    background: #eaeaea;
    border: 1px solid #eaeaea;
}

.vss-card {
    background: var(--vss-white);
    padding: var(--vss-space-lg) var(--vss-space-md);
    transition: transform 0.3s ease;
}

.vss-card:hover {
    background: var(--vss-light-gray);
}

.vss-card h3 {
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 1.25rem;
}

/* Bento Grid */
.vss-bento-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--vss-space-sm);
}

.vss-bento-card {
    padding: var(--vss-space-lg) var(--vss-space-md);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 300px;
}

.vss-span-2 {
    grid-column: span 2;
}

.vss-meta {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 2rem;
}

/* =========================================
   MARQUEE (CSS ONLY)
========================================= */
.vss-marquee-section {
    overflow: hidden;
    white-space: nowrap;
    padding: var(--vss-space-md) 0;
    border-top: 1px solid #eaeaea;
    border-bottom: 1px solid #eaeaea;
}

.vss-marquee-track {
    display: inline-block;
    animation: vss-scroll 20s linear infinite;
}

.vss-marquee-track span {
    font-size: 1.5rem;
    font-weight: 500;
    text-transform: uppercase;
    margin: 0 2rem;
}

@keyframes vss-scroll {
    0% {
        transform: translateX(0);
    }

    100% {
        transform: translateX(-50%);
    }
}

/* =========================================
   ANIMATIONS (JS Triggered)
========================================= */
.vss-fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.vss-fade-in {
    opacity: 0;
    transition: opacity 1s ease;
}

.vss-is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* =========================================
   RESPONSIVE (TABLET & MOBILE)
========================================= */
@media (max-width: 992px) {
    .vss-hero__inner {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .vss-hero__desc {
        max-width: 100%;
        margin: 0 auto var(--vss-space-md);
    }

    .vss-header-split,
    .vss-grid-4 {
        grid-template-columns: 1fr 1fr;
    }

    .vss-bento-grid {
        grid-template-columns: 1fr 1fr;
    }

    .vss-span-2 {
        grid-column: span 1;
    }

    /* Reset span trên màn nhỏ */
}

@media (max-width: 768px) {
    .vss-section {
        padding: var(--vss-space-md) 0;
    }

    .vss-header-split,
    .vss-grid-4,
    .vss-grid-2,
    .vss-bento-grid {
        grid-template-columns: 1fr;
    }

    .vss-bento-card {
        min-height: 200px;
    }
}