/***** Header *****/

.header {
    position: fixed;
    top: 66px;
    left: 50%;
    transform: translateX(-50%);
    width: min(1100px, calc(100% - 2rem));
    z-index: 30;
    transition: top 0.35s ease;

    &.header-pinned {
        top: 12px;
    }

    .header-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 1rem;
        padding: 0.85rem 1rem;
        border: 1px solid var(--border);
        border-radius: 50px;
        background: rgba(30, 31, 34, 0.72);
        backdrop-filter: blur(22px);
        box-shadow: var(--shadow);
        position: relative;
    }

    .header-brand,
    .header-burger,
    .header-link,
    .header-backdrop {
        -webkit-tap-highlight-color: transparent;
    }

    .header-brand {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        padding: 0;
        border: 0;
        background: transparent;
        cursor: pointer;
        flex: 0 0 auto;

        &:hover .header-logo,
        &:focus-visible .header-logo {
            transform: rotate(12deg) scale(1.12);
            filter: drop-shadow(0 0 14px rgba(88, 101, 242, 0.4));
        }
    }

    .header-logo {
        display: block;
        width: 2.5rem;
        filter: drop-shadow(0 0 8px rgba(88, 101, 242, 0.26));
        transition:
            transform 0.35s ease,
            filter 0.25s ease;
        transform-origin: center;
    }

    .header-nav {
        flex: 1 1 auto;
    }

    .header-list {
        list-style: none;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 0.25rem;
        padding: 0;
        margin: 0;
        flex-wrap: wrap;
    }

    .header-item {
        margin: 0;
    }

    .header-link {
        appearance: none;
        border: 0;
        background: transparent;
        color: var(--text);
        font-family: "SenRegular", sans-serif;
        font-size: 0.7rem;
        letter-spacing: 0.1em;
        text-transform: uppercase;
        text-decoration: none;
        line-height: 1;
        padding: 0.5rem 0.35rem;
        border-radius: 14px;
        cursor: pointer;
        position: relative;
        overflow: hidden;

        transition:
            color 0.3s ease,
            transform 0.3s ease;

        &::after {
            content: "";
            position: absolute;
            left: 50%;
            bottom: 0.15rem;
            width: 100%;
            height: 2px;
            background: linear-gradient(
                90deg,
                transparent,
                var(--accent),
                transparent
            );
            transform: translateX(-50%) scaleX(0);
            transform-origin: center;
            transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
        }

        &:hover,
        &:focus-visible {
            color: #fff;
            transform: translateY(-2px);

            &::after {
                transform: translateX(-50%) scaleX(1);
            }
        }
    }

    .header-burger {
        display: none;
        align-items: center;
        justify-content: center;
        width: 2.9rem;
        height: 2.9rem;
        padding: 0;
        border: 1px solid var(--border);
        border-radius: 999px;
        background: rgba(49, 51, 56, 0.92);
        cursor: pointer;
        flex: 0 0 auto;
        position: relative;
    }

    .header-burger-line {
        position: absolute;
        left: 50%;
        width: 1.1rem;
        height: 2px;
        border-radius: 999px;
        background: var(--text);
        transform: translateX(-50%);
        transition:
            transform 0.25s ease,
            opacity 0.2s ease,
            top 0.25s ease;

        &:nth-child(1) {
            top: 0.95rem;
        }

        &:nth-child(2) {
            top: 1.35rem;
        }

        &:nth-child(3) {
            top: 1.75rem;
        }
    }

    .header-open {
        .header-burger-line:nth-child(1) {
            top: 1.35rem;
            transform: translateX(-50%) rotate(45deg);
        }

        .header-burger-line:nth-child(2) {
            opacity: 0;
        }

        .header-burger-line:nth-child(3) {
            top: 1.35rem;
            transform: translateX(-50%) rotate(-45deg);
        }
    }

    .header-backdrop {
        display: none;
    }

    .scroll-top {
        position: fixed;
        bottom: 20px;
        right: 20px;
        padding: 0.8rem 0.95rem;
        font-size: 1.1rem;
        border: none;
        border-radius: 999px;
        color: white;
        cursor: pointer;
        box-shadow: 0 15px 35px rgba(0, 0, 0, 0.35);
        z-index: 25;
        background: linear-gradient(135deg, var(--accent), var(--accent-2));
        transition:
            transform 0.25s ease,
            box-shadow 0.25s ease;

        &:hover {
            transform: translateY(-3px);
            box-shadow: 0 18px 38px rgba(88, 101, 242, 0.3);
        }
    }
}

/***** Responsive tablette *****/

@media screen and (min-width: 992px) {
    .header {
        width: 100%;
        top: 66px;

        .header-inner {
            width: 55%;
            margin: 0 auto;
            padding: 0.75rem 1rem;
        }

        .header-nav {
            display: block;
        }

        .header-scrolled .header-inner {
            padding-top: 0.65rem;
            padding-bottom: 0.65rem;
            border-radius: 50px;
        }
    }
}

/***** Responsive mobile *****/

@media screen and (max-width: 991px) {
    .header {
        top: 102px;
        left: 12px;
        transform: none;
        width: calc(100% - 24px);

        &.header-pinned {
            top: 10px;
        }

        .header-inner {
            width: 50%;
            margin: 0 auto;
            align-items: flex-start;
            padding: 0.75rem;
            border-radius: 50px;
        }

        .header-burger {
            display: inline-flex;
        }

        .header-nav {
            position: absolute;
            top: calc(100% + 0.65rem);
            left: 0;
            right: 0;
            padding: 0.85rem;
            border: 1px solid var(--border);
            border-radius: 20px;
            background: rgba(30, 31, 34, 0.96);
            backdrop-filter: blur(22px);
            box-shadow: var(--shadow);
            opacity: 0;
            visibility: hidden;
            pointer-events: none;
            transform: translateY(-12px) scale(0.98);
            transform-origin: top center;
            transition:
                opacity 0.25s ease,
                transform 0.25s ease,
                visibility 0.25s ease;
            z-index: 32;
        }

        .header-nav-open {
            opacity: 1;
            visibility: visible;
            pointer-events: auto;
            transform: translateY(0) scale(1);
        }

        .header-list {
            flex-direction: column;
            align-items: stretch;
            justify-content: flex-start;
            gap: 0.35rem;
        }

        .header-link {
            width: 100%;
            text-align: left;
            padding: 0.9rem 1rem;
            font-size: 0.92rem;
            border-radius: 14px;
            letter-spacing: 0.14em;
            background: rgba(255, 255, 255, 0.02);

            &:hover,
            &:focus-visible {
                background: rgba(88, 101, 242, 0.18);
            }
        }

        .header-backdrop {
            display: block;
            position: fixed;
            inset: 0;
            border: 0;
            background: rgba(11, 12, 14, 0.4);
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.25s ease;
            z-index: 29;
        }

        .header-backdrop-visible {
            opacity: 1;
            pointer-events: auto;
        }
    }
}

@media screen and (max-width: 520px) {
    .header {
        top: 112px;
        left: 10px;
        width: calc(100% - 20px);

        &.header-pinned {
            top: 10px;
        }

        .header-inner {
            padding: 0.7rem;
        }

        .header-burger {
            width: 2.5rem;
            height: 2.5rem;
        }

        .header-burger-line:nth-child(1) {
            top: 0.88rem;
        }

        .header-burger-line:nth-child(2) {
            top: 1.25rem;
        }

        .header-burger-line:nth-child(3) {
            top: 1.62rem;
        }

        .header-open .header-burger-line:nth-child(1),
        .header-open .header-burger-line:nth-child(3) {
            top: 1.25rem;
        }
    }
}