* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f6f8fa;
    color: #222;
    margin: 0;
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 40px 0 28px 0;
    background: none;
    border-bottom: 1.5px solid #e5e8ef;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}
.logo i {
    font-size: 2rem;
    color: #4f6ef7;
}
.logo h1 {
    font-size: 1.3rem;
    font-weight: 700;
    color: #222;
    letter-spacing: 1px;
}

.nav {
    display: flex;
    gap: 32px;
    align-items: center;
}
.nav-link {
    color: #888;
    text-decoration: none;
    font-size: 1.05rem;
    padding: 2px 0;
    border-bottom: 2px solid transparent;
    transition: color 0.2s, border 0.2s;
    font-weight: 500;
}
.nav-link.active, .nav-link:hover {
    color: #4f6ef7;
    border-bottom: 2px solid #4f6ef7;
}
.lang-switch {
    margin-left: 18px;
    display: flex;
    align-items: center;
    gap: 2px;
}
.lang-btn {
    background: none;
    border: none;
    color: #4f6ef7;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 3px;
    transition: background 0.2s;
}
.lang-btn:hover {
    background: #e5e8ef;
}

.main {
    margin-top: 56px;
}

.hero {
    text-align: center;
    margin-bottom: 56px;
}
.hero-content h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 18px;
    color: #222;
    letter-spacing: 1px;
}
.hero-content p {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 38px;
}
.cta-button {
    background: linear-gradient(90deg, #4f6ef7 0%, #6a8dff 100%);
    color: #fff;
    border: none;
    padding: 15px 48px;
    font-size: 1.1rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 700;
    box-shadow: 0 2px 12px 0 rgba(79,110,247,0.08);
    transition: background 0.2s, box-shadow 0.2s, transform 0.2s;
}
.cta-button:hover {
    background: linear-gradient(90deg, #3956c6 0%, #4f6ef7 100%);
    box-shadow: 0 4px 24px 0 rgba(79,110,247,0.13);
    transform: translateY(-2px) scale(1.03);
}

.results-section {
    background: #fff;
    border-radius: 18px;
    padding: 40px 0 32px 0;
    margin: 0 0 40px 0;
    box-shadow: 0 4px 32px 0 rgba(79,110,247,0.07);
    border: 1.5px solid #e5e8ef;
}
.results-container h3 {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: 32px;
    color: #222;
    font-weight: 700;
}
.ip-info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px 32px;
    margin-bottom: 32px;
    padding: 0 32px;
}
.info-card {
    background: none;
    border-radius: 0;
    padding: 0;
    box-shadow: none;
    display: flex;
    align-items: center;
    gap: 14px;
    border-bottom: 1px solid #f0f0f0;
    min-height: 52px;
}
.card-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #4f6ef7;
    font-size: 1.3rem;
}
.card-content h4 {
    color: #888;
    font-size: 1.05rem;
    margin-bottom: 2px;
    font-weight: 400;
}
.card-content p {
    color: #222;
    font-size: 1.13rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}
.action-buttons {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-top: 12px;
}
.action-btn {
    background: #f6f8fa;
    color: #4f6ef7;
    border: 1.5px solid #e5e8ef;
    padding: 10px 32px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1.05rem;
    font-weight: 600;
    transition: background 0.2s, color 0.2s, box-shadow 0.2s;
    box-shadow: 0 1px 4px 0 rgba(79,110,247,0.04);
}
.action-btn:hover {
    background: #4f6ef7;
    color: #fff;
    box-shadow: 0 2px 12px 0 rgba(79,110,247,0.10);
}

.about-section, .tools-section {
    background: none;
    border-radius: 0;
    padding: 48px 0 0 0;
    margin: 0 0 40px 0;
    text-align: center;
    box-shadow: none;
}
.about-content h3, .tools-content h3 {
    font-size: 1.4rem;
    margin-bottom: 20px;
    color: #222;
    font-weight: 700;
}
.about-content p {
    font-size: 1.08rem;
    color: #666;
    margin-bottom: 32px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}
.features, .tools-grid {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 18px;
}
.feature, .tool-card {
    background: none;
    border-radius: 0;
    box-shadow: none;
    padding: 0;
    min-width: 120px;
    text-align: center;
}
.feature i, .tool-card i {
    font-size: 2.1rem;
    color: #4f6ef7;
    margin-bottom: 10px;
}
.feature h4, .tool-card h4 {
    font-size: 1.08rem;
    margin-bottom: 6px;
    color: #222;
    font-weight: 600;
}
.feature p, .tool-card p {
    color: #888;
    font-size: 1rem;
}
.footer {
    background: none;
    border-radius: 0;
    padding: 40px 0 18px 0;
    margin: 0;
    text-align: center;
    color: #aaa;
    border-top: 1.5px solid #e5e8ef;
}
.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}
.footer-links {
    display: flex;
    gap: 24px;
}
.footer-links a {
    color: #aaa;
    text-decoration: none;
    font-size: 1rem;
    transition: color 0.2s;
}
.footer-links a:hover {
    color: #4f6ef7;
}
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2.5px solid #e0e0e0;
    border-top: 2.5px solid #4f6ef7;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}
@media (max-width: 700px) {
    .container { padding: 0 6px; }
    .header { flex-direction: column; gap: 14px; padding: 28px 0 14px 0; }
    .main { margin-top: 24px; }
    .hero-content h2 { font-size: 1.5rem; }
    .ip-info-grid { grid-template-columns: 1fr; padding: 0 8px; }
    .features, .tools-grid { flex-direction: column; gap: 18px; }
    .results-section { padding: 24px 0 18px 0; }
}