/* ========================================
   Ling.AI - 导航栏组件样式
   ======================================== */

.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(252, 252, 249, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(252, 252, 249, 0.98);
    border-bottom-color: #e8e5dc;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.navbar-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 2rem;
    max-width: 1100px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.625rem;
    font-weight: 700;
    color: #2a2a2a;
    text-decoration: none;
    transition: opacity 0.2s ease;
}

.logo:hover { opacity: 0.8; }

.logo-icon {
    width: 40px;
    height: 40px;
    background: #d97706;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.logo-icon svg { width: 24px; height: 24px; }

.nav-links { display: flex; gap: 2.5rem; }

.nav-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: #555555;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.25rem 0;
    position: relative;
    text-decoration: none;
    transition: color 0.2s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: #d97706;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.nav-link:hover, .nav-link.active { color: #d97706; }
.nav-link:hover::after, .nav-link.active::after { transform: scaleX(1); }

.nav-actions { display: flex; align-items: center; gap: 1.25rem; }

.nav-icon {
    color: #555555;
    transition: color 0.2s ease, transform 0.2s ease;
    display: flex;
    align-items: center;
}

.nav-icon svg { width: 22px; height: 22px; fill: currentColor; }
.nav-icon:hover { color: #d97706; transform: translateY(-2px); }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.625rem;
    padding: 0.875rem 1.75rem;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    white-space: nowrap;
    text-decoration: none;
    transition: all 0.25s ease;
}

.btn-primary {
    background: #d97706;
    color: white;
    box-shadow: 0 8px 24px rgba(217, 119, 6, 0.25);
}

.btn-primary:hover {
    background: #b45309;
    color: white;
    box-shadow: 0 12px 32px rgba(217, 119, 6, 0.3);
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    border: 2px solid #e8e5dc;
    color: #2a2a2a;
}

.btn-secondary:hover {
    border-color: #d97706;
    color: #b45309;
    background: rgba(217, 119, 6, 0.05);
}

.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.25rem;
    position: relative;
}

.hamburger span, .hamburger span::before, .hamburger span::after {
    display: block;
    width: 24px;
    height: 3px;
    background: #2a2a2a;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.hamburger span::before { content: ''; position: relative; top: -8px; }
.hamburger span::after { content: ''; position: relative; top: 8px; }
.hamburger[aria-expanded="true"] span { background: transparent; }
.hamburger[aria-expanded="true"] span::before { top: 0; transform: rotate(45deg); }
.hamburger[aria-expanded="true"] span::after { top: 0; transform: rotate(-45deg); }

.mobile-menu {
    position: fixed;
    inset: 0;
    background: #fcfcf9;
    z-index: 1001;
    transform: translateX(100%);
    transition: transform 0.4s ease;
    display: none;
}

.mobile-menu.active { transform: translateX(0); }

.mobile-menu-content {
    padding: 2rem;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.mobile-menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 2rem;
    border-bottom: 1px solid #e8e5dc;
}

.mobile-menu-close {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    color: #2a2a2a;
}

.mobile-menu-close svg { width: 24px; height: 24px; }

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 2rem 0;
    flex: 1;
}

.mobile-nav-link {
    font-size: 1.125rem;
    font-weight: 500;
    color: #555555;
    padding: 1rem 0;
    text-decoration: none;
    border-bottom: 1px solid #e8e5dc;
    transition: color 0.2s ease;
}

.mobile-nav-link:hover, .mobile-nav-link.active { color: #d97706; }

.mobile-menu-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding-top: 2rem;
    border-top: 1px solid #e8e5dc;
}

@media (max-width: 1024px) { .nav-links { gap: 1.5rem; } }

@media (max-width: 768px) {
    .navbar-container { padding: 1rem 1.5rem; }
    .nav-links { display: none; }
    .nav-actions { display: none; }
    .hamburger { display: block; }
    .mobile-menu { display: block; }
}

@media (prefers-reduced-motion: reduce) {
    .navbar, .nav-link::after, .mobile-menu { transition: none; }
}