/* ============================================
   ANALEMMA AI - Header & Navigation
   ============================================ */

/* ===== HEADER ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-sticky);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-bottom: 1px solid var(--glass-border);
    transition: all var(--transition-normal);
}

.header.scrolled {
    background: rgba(10, 10, 10, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
    min-height: 72px;
}

/* ===== LOGO ===== */
.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    transition: all var(--transition-normal);
}

.logo:hover {
    transform: scale(1.02);
}

.logo-img {
    height: 2.5rem;
    width: auto;
    object-fit: contain;
    filter: drop-shadow(0 0 10px var(--glow-primary));
    transition: filter var(--transition-normal);
}

.logo:hover .logo-img {
    filter: drop-shadow(0 0 20px var(--glow-primary));
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-name {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.15em;
    line-height: 1.2;
}

@media (min-width: 768px) {
    .logo-name {
        font-size: 1.5rem;
        letter-spacing: 0.22em;
    }
}

.logo-tagline {
    font-size: 0.6rem;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 0.22em;
    text-transform: uppercase;
    display: none;
}

@media (min-width: 768px) {
    .logo-tagline {
        display: block;
        letter-spacing: 0.175em;
    }
}

/* ===== NAVIGATION ===== */
.nav {
    display: none;
    align-items: center;
    gap: 2rem;
}

@media (min-width: 1024px) {
    .nav {
        display: flex;
    }
}

.nav-link {
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    position: relative;
    padding: 0.5rem 0;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-normal);
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link:hover::after {
    width: 100%;
}

/* ===== HEADER ACTIONS ===== */
.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* ===== LANGUAGE SELECTOR ===== */
.lang-selector {
    position: relative;
    display: none;
}

@media (min-width: 1024px) {
    .lang-selector {
        display: block;
    }
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.875rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.lang-btn:hover {
    color: var(--text-primary);
    border-color: var(--accent-primary);
    background: rgba(37, 99, 235, 0.1);
}

.lang-btn svg {
    width: 1rem;
    height: 1rem;
    transition: transform var(--transition-fast);
}

.lang-selector.open .lang-btn svg {
    transform: rotate(180deg);
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    min-width: 120px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 0.5rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    z-index: var(--z-dropdown);
    box-shadow: var(--shadow-card);
}

.lang-selector.open .lang-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.625rem 0.875rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.lang-option:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.lang-option.active {
    color: var(--accent-primary);
    background: rgba(37, 99, 235, 0.1);
}

/* ===== MOBILE MENU ===== */
.mobile-menu-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
}

@media (min-width: 1024px) {
    .mobile-menu-btn {
        display: none;
    }
}

.hamburger {
    position: relative;
    width: 1.5rem;
    height: 1rem;
}

.hamburger span {
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.hamburger span:nth-child(1) { top: 0; }
.hamburger span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.hamburger span:nth-child(3) { bottom: 0; }

.mobile-menu-btn.active .hamburger span:nth-child(1) {
    top: 50%;
    transform: translateY(-50%) rotate(45deg);
}

.mobile-menu-btn.active .hamburger span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active .hamburger span:nth-child(3) {
    bottom: 50%;
    transform: translateY(50%) rotate(-45deg);
}

/* ===== MOBILE NAV ===== */
.mobile-nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    padding: 2rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-20px);
    transition: all var(--transition-normal);
    z-index: calc(var(--z-sticky) - 1);
    overflow-y: auto;
}

.mobile-nav.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.mobile-nav-link {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
    transition: color var(--transition-fast);
}

.mobile-nav-link:hover {
    color: var(--accent-primary);
}

.mobile-nav-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* ===== MOBILE LANGUAGE SWITCH ===== */
.mobile-lang-switch {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.mobile-lang-btn {
    flex: 1;
    padding: 0.75rem 1rem;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
}

.mobile-lang-btn:hover {
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

.mobile-lang-btn.active {
    color: var(--text-primary);
    background: rgba(37, 99, 235, 0.15);
    border-color: var(--accent-primary);
}

/* ===== HEADER CTA ===== */
.header-cta {
    display: none;
}

@media (min-width: 768px) {
    .header-cta {
        display: flex;
    }
}