:root {
    --primary: #1a5f7a;
    --primary-dark: #134b61;
    --accent: #159895;
    --dark: #2d3436;
    --light: #f8f9fa;
    --gray: #636e72;
    --white: #ffffff;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    --radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    color: var(--dark);
    line-height: 1.7;
    background: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.navbar {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow-sm);
    padding: 1rem 0;
    transition: var(--transition);
}

.navbar.scrolled {
    padding: 0.75rem 0;
    box-shadow: var(--shadow-md);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link {
    color: var(--dark);
    font-weight: 500;
    padding: 0.5rem 1.5rem !important;
    margin: 0 0.25rem;
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--primary);
    background: rgba(26, 95, 122, 0.05);
}

.nav-link.active {
    color: var(--primary);
    background: rgba(26, 95, 122, 0.08);
}


.language-switcher {
    display: flex;
    align-items: center;
}

.language-btn {
    padding: 0.4rem 1rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary);
    background: rgba(26, 95, 122, 0.05);
    border: 1px solid rgba(26, 95, 122, 0.1);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.language-btn:hover {
    background: rgba(26, 95, 122, 0.08);
    border-color: var(--primary);
    color: var(--primary-dark);
}

footer {
    background: var(--dark);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-about h5 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.footer-about p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
}

.footer-links {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--white);
    padding-left: 5px;
}

.footer-contact h5 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.footer-contact p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 1rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.footer-contact i {
    color: var(--accent);
    margin-top: 0.25rem;
}

.copyright {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 3rem;
    padding-top: 2rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
}


.friend-links a {
    transition: var(--transition);
}

.friend-links a:hover {
    color: var(--white) !important;
}

.border-white-10 {
    border-color: rgba(255, 255, 255, 0.1) !important;
}