:root {
    --primary-color: #3D87FA;
    --primary-light: #6BA3FF;
    --primary-dark: #2C6EE5;
}

.gradient-bg {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
}

.glass-effect {
    backdrop-filter: blur(20px);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.card-hover {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.card-hover:hover {
    transform: translateY(-8px);
    box-shadow: 0 25px 50px rgba(61, 135, 250, 0.15);
}

.animate-float {
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.text-gradient {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Navigation Menu Styles */
.nav-link {
    position: relative;
    transition: all 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

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

.nav-link.active {
    color: var(--primary-color) !important;
    font-weight: 600;
}

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

/* Mobile Navigation Styles */
.mobile-nav-link {
    position: relative;
    transition: all 0.3s ease;
}

.mobile-nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: all 0.3s ease;
}

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

.mobile-nav-link.active {
    color: var(--primary-color) !important;
    font-weight: 600;
    background-color: rgba(61, 135, 250, 0.1);
}

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

.language-selector {
    position: relative;
    display: inline-block;
}

.language-dropdown {
    display: none;
    position: absolute;
    right: 0;
    top: 100%;
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    min-width: 150px;
}

.language-dropdown.show {
    display: block;
}

.language-option {
    padding: 8px 16px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.language-option:hover {
    background-color: #f3f4f6;
}

.language-option.active {
    background-color: #3D87FA;
    color: white;
}

/* 语言切换加载状态样式 */
.language-btn:disabled,
.mobile-lang-btn:disabled {
    cursor: not-allowed;
    pointer-events: none;
}

.language-btn.opacity-50,
.mobile-lang-btn.opacity-50 {
    opacity: 0.5;
    transition: opacity 0.3s ease;
}

/* 加载动画 */
@keyframes loading-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.current-lang:contains("Loading...") {
    animation: loading-pulse 1.5s ease-in-out infinite;
}

/* Footer Language Selector Styles */
.footer-language-selector {
    position: relative;
    display: inline-block;
    width: 100%;
}

.footer-language-dropdown {
    display: none;
    position: absolute;
    bottom: 100%;
    left: 0;
    background: #1f2937;
    border: 1px solid #374151;
    border-radius: 8px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    min-width: 140px;
    margin-bottom: 8px;
}

.footer-language-dropdown.show {
    display: block;
}

.footer-language-option {
    padding: 8px 12px;
    cursor: pointer;
    transition: background-color 0.2s;
    color: #9ca3af;
}

.footer-language-option:hover {
    background-color: #374151;
    color: white;
}

.footer-language-option.active {
    background-color: #3D87FA;
    color: white;
}

.footer-language-btn {
    position: relative;
    transition: all 0.3s ease;
}

.footer-language-btn:hover {
    border-color: #6b7280;
}

.footer-language-btn:focus {
    outline: none;
    border-color: #3D87FA;
}

/* Footer language loading state */
.footer-language-btn:disabled {
    cursor: not-allowed;
    opacity: 0.5;
}