/* Claude AI Header CSS - Clean, Professional Navigation */

.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    transition: all var(--transition-normal);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-4) var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 72px;
}

/* Logo Section */
.header-left {
    display: flex;
    align-items: center;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--orange-500), var(--orange-600));
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.logo-icon:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.logo-icon svg {
    width: 20px;
    height: 20px;
}

.app-title {
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--gray-900);
    letter-spacing: -0.025em;
}
h1.app-title {margin:0;}
/* Navigation */
.header-nav {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--gray-700);
    background: transparent;
    border: 1px solid transparent;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(238, 119, 35, 0.1), transparent);
    transition: left var(--transition-slow);
}

.nav-link:hover::before {
    left: 100%;
}

.nav-link:hover {
    color: var(--orange-600);
    background: var(--orange-50);
    border-color: var(--orange-200);
    transform: translateY(-1px);
}

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

.nav-icon {
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Header Actions */
.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.header-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-lg);
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    color: var(--gray-600);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.header-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--orange-500);
    opacity: 0;
    transition: opacity var(--transition-normal);
    border-radius: inherit;
}

.header-btn:hover::before {
    opacity: 0.1;
}

.header-btn:hover {
    color: var(--orange-600);
    border-color: var(--orange-300);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.header-btn:active {
    transform: translateY(0);
}

.header-btn svg {
    position: relative;
    z-index: 1;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .header-container {
        padding: var(--space-3) var(--space-4);
    }
    
    .header-nav {
        gap: var(--space-1);
    }
    
    .nav-link {
        padding: var(--space-2) var(--space-3);
        font-size: var(--text-xs);
    }
    
    .nav-icon {
        font-size: 14px;
    }
}

@media (max-width: 768px) {
    .header-container {
        flex-wrap: wrap;
        gap: var(--space-3);
    }
    
    .header-nav {
        order: 3;
        width: 100%;
        justify-content: center;
        padding-top: var(--space-3);
        border-top: 1px solid var(--gray-200);
    }
    
    .nav-link {
        flex: 1;
        justify-content: center;
        min-width: 0;
    }
    
    .nav-link span:last-child {
        display: none;
    }
    
    .app-title {
        font-size: var(--text-lg);
    }
    
    .logo-icon {
        width: 36px;
        height: 36px;
    }
    
    .header-btn {
        width: 36px;
        height: 36px;
    }
}

@media (max-width: 480px) {
    .header-container {
        padding: var(--space-3);
    }
    
    .header-nav {
        gap: var(--space-1);
    }
    
    .nav-link {
        padding: var(--space-2);
        border-radius: var(--radius-md);
    }
    
    .header-right {
        gap: var(--space-1);
    }
}

/* Header scroll effects */
.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-sm);
}

/* Header animation on page load */
.header {
    animation: slideDown 0.4s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Focus states for accessibility */
.nav-link:focus-visible,
.header-btn:focus-visible {
    outline: 2px solid var(--orange-500);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .header {
        background: white;
        border-bottom: 2px solid black;
    }
    
    .nav-link,
    .header-btn {
        border-width: 2px;
    }
    
    .nav-link:hover,
    .header-btn:hover {
        border-color: var(--orange-600);
    }
}

/* Print styles */
@media print {
    .header {
        display: none;
    }
}