/* ========================================================================== */
/* Header shell                                                               */
/* ========================================================================== */

.header {
    --header-accent: #facc14;
    --header-text: #e1e1e1;
    --header-bg-start: #2b0066;
    --header-bg-mid: #1a0033;
    --header-bg-end: #120022;
    --header-surface: rgba(255, 255, 255, 0.07);
    --header-surface-soft: rgba(255, 255, 255, 0.035);

    /* Fluid size tokens: 360px → 1360px */
    --header-logo-height: clamp(40px, calc((146px + 15vw) / 5), 70px);
    --header-nav-gap: clamp(6px, calc((12px + 5vw) / 5), 16px);
    --header-menu-min-width: 220px;
    --header-menu-option-padding-inline: 12px;
    background: linear-gradient(90deg, var(--header-bg-start), var(--header-bg-mid));
}

.header__inner {
    position: relative;
    z-index: 2;
    max-width: 1600px;
    margin: 0 auto;
    padding: 8px var(--header-nav-gap);
    display: flex;
    align-items: center;
    gap: var(--header-nav-gap);
}


/* ========================================================================== */
/* Logo                                                                       */
/* ========================================================================== */

.header__logo {
    flex: 0 0 auto;
    margin-right: auto;
}

.header__logo a {
    display: inline-flex;
    align-items: center;
}

.header__logo img {
    display: block;
    width: auto;
    height: var(--header-logo-height);
    transition: transform var(--transition-medium), filter var(--transition-medium);
}

.header__logo img:hover {
    transform: scale(1.1);
    filter: brightness(1.1);
}


/* ========================================================================== */
/* Navigation layout                                                          */
/* ========================================================================== */

.header__nav {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--header-nav-gap);
}


/* ========================================================================== */
/* Shared navigation items and controls                                       */
/* ========================================================================== */

.header__link,
.header__dropdown-toggle,
.header__icon-button {
    color: var(--header-text);
    line-height: 1;
    font-size: clamp(1rem, calc((30.1rem + 4vw) / 31), 1.1rem);
    font-weight: 600;
    letter-spacing: 0.04em;
    text-decoration: none;
    white-space: nowrap;
    transition: color var(--transition-medium), background-color var(--transition-medium), text-decoration-color var(--transition-medium);
}

/* Reset button controls. */
.header__dropdown-toggle,
.header__icon-button {
    border: 0;
    background: transparent;
    cursor: pointer;
}

.header__link:hover,
.header__dropdown-toggle:hover,
.header__dropdown.is-open .header__dropdown-toggle,
.header__language.is-open .header__language-toggle {
    color: var(--header-accent);
}

.header__link.is-active,
.header__dropdown-toggle.is-active {
    color: var(--header-accent);
    text-decoration: underline;
    text-decoration-color: var(--header-accent);
    text-decoration-thickness: 2px;
    text-underline-offset: 6px;
}


/* ========================================================================== */
/* Dropdown and language controls                                             */
/* ========================================================================== */

/*
    `.is-open` is expected to be toggled by JavaScript.
    `.is-active` is expected to be added by routing/server-side logic.
*/
.header__dropdown,
.header__language {
    position: relative;
}

.header__dropdown {
    display: flex;
    align-items: center;
}

.header__language {
    flex: 0 0 auto;
}

.header__dropdown-toggle {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.header__icon-button {
    min-width: calc(var(--icon-s) + var(--space-s) + var(--space-s));
    min-height: calc(var(--icon-s) + var(--space-s) + var(--space-s));
    padding: var(--space-s);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    border-radius: var(--radius-s);
}

.header__icon-button:hover,
.header__language.is-open .header__icon-button {
    background: var(--header-surface);
}


/* ========================================================================== */
/* Icons and arrows                                                           */
/* ========================================================================== */

.header__icon {
    width: var(--icon-s);
    height: auto;
    display: block;
    flex: 0 0 auto;
}

.header__icon {
    width: var(--icon-s);
    height: auto;
    max-width: var(--icon-s);
    max-height: var(--icon-s);
    display: block;
    flex: 0 0 auto;
}

.header__arrow {
    width: 0;
    height: 0;
    flex: 0 0 auto;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 6px solid var(--header-text);
    transition: transform var(--transition-medium), border-top-color var(--transition-medium);
}

.header__dropdown.is-open .header__arrow,
.header__language.is-open .header__arrow {
    transform: rotate(180deg);
    border-top-color: var(--header-accent);
}


/* ========================================================================== */
/* Dropdown menus                                                             */
/* ========================================================================== */

/* Dropdowns are closed by default and opened by JS via `.is-open`. */
.header__menu {
    display: none;
    position: absolute;
    top: 100%;
    min-width: var(--header-menu-min-width);
    max-width: calc(100vw - 32px);
    padding: 8px 0;
    background: linear-gradient(180deg, var(--header-bg-mid), var(--header-bg-end));
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.42);
    z-index: 1000;
}

.header__dropdown-menu {
    left: 0;
}

.header__language-menu {
    right: 0;
}

.header__dropdown.is-open .header__menu,
.header__language.is-open .header__menu {
    display: block;
}

.header__menu-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px var(--header-menu-option-padding-inline);
    color: var(--header-text);
    text-decoration: none;
    white-space: nowrap;
    transition: background-color var(--transition-medium), color var(--transition-medium);
}

.header__menu-option:hover,
.header__menu-option.is-active {
    background: var(--header-surface);
    color: var(--header-accent);
}


/* ========================================================================== */
/* Focus states                                                               */
/* ========================================================================== */

.header__link:focus-visible,
.header__dropdown-toggle:focus-visible,
.header__icon-button:focus-visible,
.header__mobile-toggle:focus-visible,
.header__menu-option:focus-visible {
    outline: 2px solid var(--header-accent);
    outline-offset: 3px;
}


/* ========================================================================== */
/* Mobile menu button                                                         */
/* ========================================================================== */

.header__mobile-toggle {
    display: none;
    width: calc(var(--icon-s) + var(--space-s) + var(--space-s));
    height: calc(var(--icon-s) + var(--space-s) + var(--space-s));
    flex: 0 0 auto;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: var(--radius-s);
    background: var(--header-surface);
    cursor: pointer;
}

.header__mobile-toggle span {
    position: absolute;
    left: 50%;
    top: 50%;
    display: block;
    width: 22px;
    height: 2px;
    border-radius: 999px;
    background: var(--header-text);
    transform-origin: center;
    transition: transform var(--transition-medium), opacity var(--transition-medium), background-color var(--transition-medium);
}

.header__mobile-toggle span:nth-child(1) {
    transform: translate(-50%, -50%) translateY(-7px);
}

.header__mobile-toggle span:nth-child(2) {
    transform: translate(-50%, -50%);
}

.header__mobile-toggle span:nth-child(3) {
    transform: translate(-50%, -50%) translateY(7px);
}

.header__mobile-toggle:hover span,
.header.is-nav-open .header__mobile-toggle span {
    background: var(--header-accent);
}

.header.is-nav-open .header__mobile-toggle span:nth-child(1) {
    transform: translate(-50%, -50%) rotate(45deg);
}

.header.is-nav-open .header__mobile-toggle span:nth-child(2) {
    opacity: 0;
}

.header.is-nav-open .header__mobile-toggle span:nth-child(3) {
    transform: translate(-50%, -50%) rotate(-45deg);
}


/* ========================================================================== */
/* Desktop hover behavior                                                     */
/* ========================================================================== */

/* Desktop hover only on real mouse/trackpad devices. */
@media (min-width: 1000px) and (hover: hover) and (pointer: fine) {

    .header__dropdown:hover .header__dropdown-menu,
    .header__language:hover .header__language-menu {
        display: block;
    }

    .header__dropdown:hover .header__dropdown-toggle,
    .header__language:hover .header__language-toggle {
        color: var(--header-accent);
    }

    .header__dropdown:hover .header__arrow,
    .header__language:hover .header__arrow {
        transform: rotate(180deg);
        border-top-color: var(--header-accent);
    }
}

/* ========================================================================== */
/* Responsive: tablet / phone                                                 */
/* ========================================================================== */

/* Compact header. This is deliberately CSS-based for reliability. */
@media (max-width: 999px) {
    .header__inner {
        flex-wrap: wrap;
    }

    .header__logo {
        order: 1;
        margin-right: auto;
    }

    .header__mobile-toggle {
        order: 2;
        display: block;
    }

    .header__theme-toggle {
        order: 3;
    }

    .header__language {
        order: 4;
    }

    .header__nav {
        order: 5;
        width: 100%;
        flex: 0 0 100%;
        display: none;
        margin-left: 0;
        padding: var(--radius-s) 0 4px;
        align-items: stretch;
        justify-content: flex-start;
        border-top: 1px solid rgba(255, 255, 255, 0.08);
    }

    .header.is-nav-open .header__nav {
        display: flex;
        flex-direction: column;
    }

    .header__link,
    .header__dropdown-toggle {
        width: 100%;
        min-height: calc(var(--icon-s) + var(--space-s) + var(--space-s));
        padding: 10px var(--radius-s);
        display: flex;
        align-items: center;
        justify-content: space-between;
        border-bottom: 0;
        border-radius: var(--radius-s);
        background: var(--header-surface-soft);
    }

    .header__link:hover,
    .header__dropdown-toggle:hover,
    .header__link.is-active,
    .header__dropdown-toggle.is-active,
    .header__dropdown.is-open .header__dropdown-toggle {
        background: var(--header-surface);
    }

    .header__dropdown {
        width: 100%;
        display: block;
    }

    .header__dropdown-menu {
        position: static;
        width: 100%;
        min-width: 0;
        max-width: none;
        margin: 6px 0 4px;
        padding: 6px;
        border-radius: var(--radius-m);
        background: rgba(18, 0, 34, 0.82);
        box-shadow: none;
    }

    .header__dropdown-option {
        min-height: 40px;
        border-radius: 10px;
    }
}