* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: linear-gradient(
        135deg,
        #eef6ff,
        #ffffff
    );
    color: #1f2937;
}

.index-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.index-header {
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 22px;
    background: #e7f0fd;
    border-bottom: 3px solid #90caf9;
    box-shadow: 0 4px 15px rgba(13, 71, 161, .16);
}

.index-header-logo {
    width: auto;
    height: 48px;
    max-width: 210px;
    display: block;
    object-fit: contain;
}

.index-header-link {
    padding: 9px 15px;
    border: 1px solid #b9d3ec;
    border-radius: 9px;
    background: #ffffff;
    color: #0f172a;
    font-size: 13px;
    font-weight: 700;
    text-decoration: none;
}

.index-header-link:hover {
    background: #e8f1fb;
    color: #155fa0;
}

.index-main {
    width: 100%;
    max-width: 1050px;
    margin: 0 auto;
    padding: 35px 18px 50px;
}

.index-hero {
    max-width: 670px;
    margin: 0 auto 32px;
    padding: 32px 24px;
    border: 1px solid #dbe4f0;
    border-radius: 20px;
    background: #ffffff;
    box-shadow: 0 12px 30px rgba(15, 23, 42, .07);
    text-align: center;
}

.index-logo {
    width: 110px;
    height: 110px;
    display: block;
    object-fit: contain;
    margin: 0 auto 18px;
    border-radius: 24px;
}

.index-hero h1 {
    margin: 0 0 10px;
    color: #0d47a1;
    font-size: 34px;
}

.index-tagline {
    margin: 0 0 14px;
    color: #1976d2;
    font-size: 18px;
    font-weight: 700;
}

.index-description {
    max-width: 560px;
    margin: 0 auto;
    color: #475569;
    font-size: 15px;
    line-height: 1.7;
}

.index-actions {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 25px;
}

.index-button {
    display: inline-block;
    min-width: 150px;
    padding: 13px 18px;
    border: 0;
    border-radius: 11px;
    font-size: 15px;
    font-weight: 700;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
}

.index-button-primary {
    background: #1976d2;
    color: #ffffff;
}

.index-button-primary:hover {
    background: #1565b8;
}

.index-button-secondary {
    background: #e8f1fb;
    color: #0f172a;
}

.index-button-secondary:hover {
    background: #d7e8f8;
}

.index-features {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 28px;
}

.index-feature {
    padding: 22px 17px;
    border: 1px solid #dbe4f0;
    border-radius: 15px;
    background: #ffffff;
    box-shadow: 0 8px 22px rgba(15, 23, 42, .05);
    text-align: center;
}

.index-feature-icon {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 12px;
    border: 1px solid #b9d3ec;
    border-radius: 15px;
    background: #e8f1fb;
    font-size: 26px;
}

.index-feature h2 {
    margin: 0 0 8px;
    color: #0d47a1;
    font-size: 18px;
}

.index-feature p {
    margin: 0;
    color: #64748b;
    font-size: 13px;
    line-height: 1.55;
}

.index-install-card {
    max-width: 670px;
    margin: 0 auto 26px;
    padding: 24px;
    border: 1px solid #b9d3ec;
    border-radius: 16px;
    background: #f8fbff;
    text-align: center;
}

.index-install-card h2 {
    margin: 0 0 8px;
    color: #0d47a1;
    font-size: 21px;
}

.index-install-card p {
    margin: 0 auto 17px;
    max-width: 560px;
    color: #475569;
    font-size: 14px;
    line-height: 1.6;
}

.index-install-message {
    min-height: 20px;
    margin-top: 12px;
    color: #475569;
    font-size: 13px;
}

.index-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 18px;
    margin-top: 20px;
}

.index-links a {
    color: #1976d2;
    font-size: 13px;
    font-weight: 700;
    text-decoration: none;
}

.index-links a:hover {
    color: #0d47a1;
    text-decoration: underline;
}

.index-footer {
    margin-top: auto;
    padding: 20px;
    border-top: 1px solid #dbe4f0;
    color: #64748b;
    font-size: 12px;
    text-align: center;
}

@media (max-width: 800px) {
    .index-features {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .index-header {
        min-height: 62px;
        padding: 8px 12px;
    }

    .index-header-logo {
        height: 40px;
        max-width: 175px;
    }

    .index-main {
        padding: 22px 12px 35px;
    }

    .index-hero {
        padding: 26px 18px;
    }

    .index-logo {
        width: 90px;
        height: 90px;
    }

    .index-hero h1 {
        font-size: 28px;
    }

    .index-actions {
        flex-direction: column;
    }

    .index-button {
        width: 100%;
    }
}

@media (max-width: 430px) {
    .index-features {
        grid-template-columns: 1fr;
    }

    .index-feature {
        padding: 18px;
    }
}