/* ===================================
   NAVIGATION STYLES
   =================================== */

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 18px var(--spacing-md) 0;
    z-index: 1000;
    transition: background var(--transition-fast);
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.2), transparent);
    pointer-events: none;
    z-index: -1;
}

.header-logo {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.header-logo .logo-link {
    font-family: var(--font-logo);
    font-size: 20px;
    font-weight: 600;
    letter-spacing: 3px;
    color: #ffffff;
    text-transform: uppercase;
    white-space: nowrap;
    text-indent: 6px;
}

/* Hamburger */
.hamburger {
    position: absolute;
    right: var(--spacing-md);
    top: 18px;
    z-index: 1001;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 9px;
    width: 1.7rem;
    height: 1.5rem;
    background: transparent;
    border: none;
    padding: 0;
    cursor: pointer;
}

.hamburger-line {
    display: block;
    width: 100%;
    height: 2px;
    background: #ffffff;
    mix-blend-mode: difference;
    transform-origin: center;
    transition: transform 0.35s ease;
}

/* @keyframes: slide to center first, then rotate */
@keyframes ham-top-open {
    0%   { transform: translateY(0)     rotate(0deg);  }
    50%  { transform: translateY(5.5px) rotate(0deg);  }
    100% { transform: translateY(5.5px) rotate(45deg); }
}
@keyframes ham-bot-open {
    0%   { transform: translateY(0)      rotate(0deg);   }
    50%  { transform: translateY(-5.5px) rotate(0deg);   }
    100% { transform: translateY(-5.5px) rotate(-45deg); }
}
@keyframes ham-top-close {
    0%   { transform: translateY(5.5px) rotate(45deg); }
    50%  { transform: translateY(5.5px) rotate(0deg);  }
    100% { transform: translateY(0)     rotate(0deg);  }
}
@keyframes ham-bot-close {
    0%   { transform: translateY(-5.5px) rotate(-45deg); }
    50%  { transform: translateY(-5.5px) rotate(0deg);   }
    100% { transform: translateY(0)      rotate(0deg);   }
}

.hamburger.active .hamburger-line:first-child {
    animation: ham-top-open 1.5s ease forwards;
}
.hamburger.active .hamburger-line:last-child {
    animation: ham-bot-open 1.5s ease forwards;
}
.hamburger.closing .hamburger-line:first-child {
    animation: ham-top-close 1.5s ease forwards;
}
.hamburger.closing .hamburger-line:last-child {
    animation: ham-bot-close 1.5s ease forwards;
}

/* Navigation Overlay */
.nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 999;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-medium), visibility var(--transition-medium);
}

.nav-overlay.active {
    pointer-events: all;
    opacity: 1;
    visibility: visible;
}

.nav-overlay::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #d4d0c8;
}

/* When menu is open: logo + hamburger lines turn dark */
body.menu-open .logo-link {
    color: var(--color-text-dark) !important;
    transition: color 0.3s ease;
}

body.menu-open .hamburger-line {
    background: var(--color-text-dark) !important;
    mix-blend-mode: normal;
}

.nav-content {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--header-height) var(--spacing-md) var(--spacing-lg);
}

.nav-links {
    text-align: center;
    margin-bottom: auto;
    margin-top: auto;
}

.nav-links li {
    margin-bottom: var(--spacing-md);
    overflow: hidden;
}

.nav-link {
    font-family: var(--font-primary);
    font-size: 28px;
    font-weight: 700;
    letter-spacing: 4px;
    color: var(--color-text-dark);
    text-transform: uppercase;
    display: inline-block;
    transform: translateY(100%);
    transition: transform var(--transition-smooth), opacity var(--transition-fast);
}

.nav-overlay.active .nav-link {
    transform: translateY(0);
}

.nav-overlay.active .nav-links li:nth-child(1) .nav-link {
    transition-delay: 0.15s;
}

.nav-overlay.active .nav-links li:nth-child(2) .nav-link {
    transition-delay: 0.25s;
}

.nav-overlay.active .nav-links li:nth-child(3) .nav-link {
    transition-delay: 0.35s;
}

.nav-overlay.active .nav-links li:nth-child(4) .nav-link {
    transition-delay: 0.45s;
}

.nav-link:active {
    opacity: 0.5;
}

/* Nav Footer */
.nav-footer {
    width: 100%;
    padding: 0 var(--spacing-sm);
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-smooth) 0.5s;
}

.nav-overlay.active .nav-footer {
    opacity: 1;
    transform: translateY(0);
}

.nav-services {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.nav-services a {
    font-size: 9px;
    letter-spacing: 1.5px;
    color: var(--color-text-dark);
    font-weight: 500;
    opacity: 0.7;
}

.nav-divider {
    width: 100%;
    height: 1px;
    background: var(--color-border-dark);
    margin: var(--spacing-sm) 0;
}

.nav-social {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
}

.social-circle {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 1.5px solid currentColor;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-logo);
    font-size: 8px;
    font-weight: 700;
    letter-spacing: 0;
    color: var(--color-text-dark);
    text-decoration: none;
    transition: all var(--transition-fast);
    opacity: 0.85;
}

.social-circle:active {
    background: var(--color-text-dark);
    color: var(--color-bg-light);
    opacity: 1;
}

.lang-switcher {
    position: fixed;
    bottom: 20px;
    left: 20px;
    display: flex;
    align-items: center;
    z-index: 1001;
    border-radius: 50px;
    background: #000;
    padding: 4px;
    gap: 2px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.lang-btn {
    padding: 8px 12px;
    font-family: var(--font-logo);
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 1px;
    transition: all var(--transition-fast);
    background: transparent;
    color: #fff;
    border-radius: 50px;
    border: none;
    cursor: pointer;
}

.lang-btn.active {
    background: #fff;
    color: #000;
}

/* Header on light sections */
.header.dark-text .logo-link {
    color: var(--color-text-dark);
}

.header.dark-text .hamburger-line {
    background: var(--color-text-dark);
    mix-blend-mode: normal;
}

.header.dark-text::before {
    background: none;
}

/* ===================================
   MOBILE RESPONSIVE — Nav
   Match theupper.studio mobile layout
   =================================== */
@media (max-width: 768px) {
    .header {
        height: 60px;
        padding: 14px 16px 0;
    }

    /* Logo — smaller on mobile like original ~14px */
    .header-logo .logo-link {
        font-size: 14px;
        letter-spacing: 2.5px;
        text-indent: 4px;
    }

    /* Hamburger — positioned higher, match original */
    .hamburger {
        right: 16px;
        top: 14px;
        width: 1.5rem;
        height: 1.3rem;
        gap: 7px;
    }

    .hamburger-line {
        height: 1.5px;
    }

    /* Language switcher — compact like original FR/EN */
    .lang-switcher {
        bottom: 16px;
        left: 16px;
        padding: 3px;
        gap: 1px;
    }

    .lang-btn {
        padding: 6px 9px;
        font-size: 9px;
        letter-spacing: 0.5px;
    }

    /* Nav overlay — menu links smaller */
    .nav-link {
        font-size: 22px;
        letter-spacing: 3px;
    }

    .nav-links li {
        margin-bottom: 18px;
    }

    .nav-services a {
        font-size: 8px;
        letter-spacing: 1px;
    }

    .nav-services {
        gap: 14px;
        flex-wrap: wrap;
        justify-content: center;
    }

    .social-circle {
        width: 28px;
        height: 28px;
    }

    .social-circle svg {
        width: 8px;
        height: 8px;
    }
}