/* ============================================================
   TAXTRIPE — HEADER.CSS · v1.4
   Estilo Revolut: backdrop-filter, mega-menu animado, fluido
   ============================================================ */

.tt-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: 64px;
    background: rgba(255, 255, 255, 0);
    transition: background 280ms var(--tt-ease), backdrop-filter 280ms var(--tt-ease), border-color 280ms var(--tt-ease), box-shadow 280ms var(--tt-ease);
    border-bottom: 1px solid transparent;
}
.tt-header[data-state="scrolled"] {
    background: rgba(255, 255, 255, 0.78);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    backdrop-filter: saturate(180%) blur(20px);
    border-bottom-color: var(--tt-border);
    box-shadow: 0 1px 24px rgba(10, 10, 10, 0.04);
}

body:has(.tt-tool-main) { padding-top: 64px; }

.tt-header__container {
    max-width: 1280px;
    margin: 0 auto;
    height: 100%;
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

/* LOGO */
.tt-header__logo {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    color: var(--tt-ink);
    font-weight: 700;
    letter-spacing: -0.02em;
    flex-shrink: 0;
}
.tt-wordmark {
    font-size: 18px;
    font-weight: 800;
}
.tt-wordmark__dot {
    color: var(--tt-lime-600);
}

/* NAV */
.tt-header__nav {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
    justify-content: center;
}

.tt-nav-link {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: transparent;
    border: none;
    font-family: var(--tt-font);
    font-size: 14px;
    font-weight: 500;
    color: var(--tt-ink);
    cursor: pointer;
    text-decoration: none;
    border-radius: 8px;
    transition: background 180ms var(--tt-ease), color 180ms var(--tt-ease);
}
.tt-nav-link:hover {
    background: rgba(10, 10, 10, 0.04);
}
.tt-nav-link::after {
    content: '';
    position: absolute;
    left: 14px;
    right: 14px;
    bottom: 4px;
    height: 1.5px;
    background: var(--tt-ink);
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 280ms var(--tt-ease);
    border-radius: 2px;
}
.tt-nav-link:hover::after {
    transform: scaleX(0.6);
}
.tt-nav-chevron {
    width: 12px;
    height: 12px;
    transition: transform 200ms var(--tt-ease);
}

/* NAV GROUP con dropdown */
.tt-nav-group {
    position: relative;
}
.tt-nav-group:hover .tt-nav-link--has-dropdown .tt-nav-chevron {
    transform: rotate(180deg);
}
.tt-nav-group:hover .tt-mega-menu,
.tt-nav-link--has-dropdown[aria-expanded="true"] + .tt-mega-menu,
.tt-mega-menu.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
}

/* MEGA MENU estilo Revolut */
.tt-mega-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    margin-top: 8px;
    background: rgba(255, 255, 255, 0.96);
    -webkit-backdrop-filter: saturate(180%) blur(24px);
    backdrop-filter: saturate(180%) blur(24px);
    border: 1px solid var(--tt-border);
    border-radius: 16px;
    box-shadow: 0 24px 64px rgba(10, 10, 10, 0.12),
                0 2px 8px rgba(10, 10, 10, 0.04);
    padding: 20px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 220ms var(--tt-ease), transform 220ms var(--tt-ease);
    min-width: 760px;
}
.tt-mega-menu__container {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 4px;
}
.tt-mega-menu__col {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 4px;
}
.tt-mega-menu__heading {
    font-family: var(--tt-mono);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--tt-soft);
    font-weight: 600;
    padding: 6px 12px 8px;
    margin-bottom: 2px;
}
.tt-mega-menu__item {
    display: block;
    padding: 10px 12px;
    border-radius: 10px;
    text-decoration: none;
    color: var(--tt-ink);
    transition: background 160ms var(--tt-ease), transform 160ms var(--tt-ease);
    position: relative;
}
.tt-mega-menu__item:hover {
    background: var(--tt-lime-50);
    transform: translateX(2px);
}
.tt-mega-menu__item:hover .tt-mega-menu__item-title {
    color: var(--tt-lime-600);
}
.tt-mega-menu__item-title {
    font-size: 14px;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--tt-ink);
    transition: color 160ms var(--tt-ease);
    display: flex;
    align-items: center;
    gap: 4px;
}
.tt-mega-menu__item-title::after {
    content: '→';
    opacity: 0;
    transform: translateX(-4px);
    transition: opacity 160ms var(--tt-ease), transform 160ms var(--tt-ease);
    font-weight: 400;
}
.tt-mega-menu__item:hover .tt-mega-menu__item-title::after {
    opacity: 1;
    transform: translateX(0);
}
.tt-mega-menu__item-meta {
    font-size: 12px;
    color: var(--tt-soft);
    margin-top: 2px;
}

/* CTA del header */
.tt-header__cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}
.tt-header__login {
    color: var(--tt-ink);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 8px;
    transition: background 160ms var(--tt-ease);
}
.tt-header__login:hover {
    background: rgba(10, 10, 10, 0.04);
}
.tt-header__signup {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--tt-ink);
    color: var(--tt-paper);
    padding: 9px 16px;
    border-radius: 999px;
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    transition: transform 180ms var(--tt-ease), box-shadow 180ms var(--tt-ease);
}
.tt-header__signup:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 20px rgba(10, 10, 10, 0.2);
}

/* MOBILE */
.tt-header__mobile-toggle {
    display: none;
    background: transparent;
    border: none;
    width: 36px;
    height: 36px;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    cursor: pointer;
    color: var(--tt-ink);
}
.tt-header__mobile-toggle:hover { background: rgba(10, 10, 10, 0.04); }
.tt-header__mobile-toggle svg { width: 20px; height: 20px; }
.tt-header__mobile-toggle .icon-close { display: none; }
.tt-header__mobile-toggle[aria-expanded="true"] .icon-open { display: none; }
.tt-header__mobile-toggle[aria-expanded="true"] .icon-close { display: block; }

.tt-mobile-menu {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--tt-paper-pure);
    overflow-y: auto;
    padding: 24px 24px 80px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 200ms var(--tt-ease);
    z-index: 99;
}
.tt-mobile-menu[aria-hidden="false"] {
    opacity: 1;
    pointer-events: auto;
}
.tt-mobile-menu__group {
    border-bottom: 1px solid var(--tt-border);
    padding: 16px 0;
}
.tt-mobile-menu__heading {
    font-family: var(--tt-mono);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--tt-soft);
    margin-bottom: 8px;
}
.tt-mobile-menu__link {
    display: block;
    padding: 12px 0;
    color: var(--tt-ink);
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
}
.tt-mobile-menu__link-meta {
    font-size: 12px;
    color: var(--tt-soft);
    margin-top: 2px;
}
.tt-mobile-menu__footer {
    margin-top: 24px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

@media (max-width: 968px) {
    .tt-header__container { padding: 0 20px; gap: 12px; }
    .tt-header__nav { display: none; }
    .tt-header__cta .tt-header__login { display: none; }
    .tt-header__mobile-toggle { display: inline-flex; }
}