/* 
  Interactive Heading Styles
  ──────────────────────────
  Per-letter hover animation with premium gradient.
  Depends on global.css tokens.
*/

.interactive-heading {
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: default;
    transition: transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
    user-select: none;
    padding: 30px 0;
    will-change: transform;
    perspective: 1000px;
    position: relative;
}

/* Container scale on hover */
.interactive-heading:hover {
    transform: scale(1.02) translateY(-5px);
}

.interactive-letter {
    display: inline-block;
    position: relative;
    font-size: 64px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: -0.02em;
    color: rgba(255, 255, 255, 0.85);

    /* Premium Multi-Color Gradient */
    background: linear-gradient(
        180deg,
        rgba(255, 255, 255, 0.95) 0%,
        rgba(255, 255, 255, 0.6) 50%,
        rgba(0, 212, 255, 0.3) 100%
    );
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;

    transition:
        transform 0.45s cubic-bezier(0.23, 1, 0.32, 1),
        color 0.4s ease,
        filter 0.4s ease,
        letter-spacing 0.4s ease;

    will-change: transform;
    backface-visibility: hidden;
    transform: translate3d(0, 0, 0);
    animation: floating 4s ease-in-out infinite;
    animation-delay: var(--delay);
    text-shadow: 0 0 40px rgba(0, 212, 255, 0.1);
}

/* Shimmer Animation Effect */
.interactive-heading::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 50%;
    height: 100%;
    background: linear-gradient(90deg,
            transparent,
            rgba(255, 7, 58, 0.08),
            rgba(0, 212, 255, 0.05),
            transparent);
    animation: shimmer 8s infinite linear;
    pointer-events: none;
    will-change: transform;
}

@keyframes shimmer {
    0% {
        transform: translate3d(-200%, 0, 0);
    }
    100% {
        transform: translate3d(400%, 0, 0);
    }
}

@keyframes floating {
    0%,
    100% {
        transform: translate3d(0, 0, 0);
    }
    50% {
        transform: translate3d(0, -8px, 0);
    }
}

/* Active letter state (zoomed in / hovered) */
.interactive-letter.active {
    color: #ffffff;
    background: linear-gradient(180deg, #FFFFFF 0%, #FF073A 60%, #00D4FF 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 15px rgba(255, 7, 58, 0.9)) drop-shadow(0 0 30px rgba(0, 212, 255, 0.3));
    z-index: 10;
    animation-play-state: paused;
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
    .interactive-letter {
        font-size: 40px;
    }

    .interactive-heading {
        padding: 15px 10px;
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .interactive-letter {
        font-size: 26px;
        letter-spacing: -0.03em;
    }

    .interactive-heading {
        padding: 10px 8px;
        flex-wrap: wrap;
        gap: 0;
    }
}