* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Inter", "Segoe UI", Arial, sans-serif;
    background: linear-gradient(135deg, #eef2ff, #f8fafc);
    color: #0f172a;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ---------- HEADER ---------- */
header {
    background: #020617;
    color: #ffffff;
    padding: 14px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 18px;
    font-weight: 600;
}

nav a {
    color: #cbd5f5;
    text-decoration: none;
    margin-left: 18px;
    font-size: 14px;
}

nav a:hover {
    color: #ffffff;
}

/* ---------- MAIN ---------- */
main {
    flex: 1;
    padding: 30px 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.card {
    background: #ffffff;
    max-width: 460px;
    width: 100%;
    padding: 36px;
    border-radius: 14px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.title {
    font-size: 26px;
    font-weight: 800;
    margin-bottom: 6px;
}

.subtitle {
    font-size: 14px;
    color: #475569;
    margin-bottom: 24px;
}

.clock {
    font-size: 48px;
    font-weight: 800;
    letter-spacing: 1.5px;
    margin-bottom: 20px;
}

.toggle {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 24px;
}

.toggle button {
    padding: 10px 22px;
    border-radius: 8px;
    border: none;
    font-size: 14px;
    cursor: pointer;
    background: #e5e7eb;
    color: #0f172a;
}

.toggle button.active {
    background: #2563eb;
    color: #ffffff;
    font-weight: 600;
}

.info {
    font-size: 14px;
    color: #334155;
    line-height: 1.8;
}

/* ---------- SEO CONTENT ---------- */
.seo-content {
    width: 100%;
    background: #f8fafc;
    padding: 60px 16px;
    margin-top: 40px;
}

.seo-container {
    max-width: 1100px;
    margin: 0 auto;
    background: transparent; /* removed pure white */
    padding: 0;
}

.seo-container h2 {
    font-size: 26px;
    font-weight: 800;
    margin-bottom: 28px;
    color: #020617;
    text-align: center;
}

.seo-block {
    margin-bottom: 32px;
}

.seo-block h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
    color: #0f172a;
}

.seo-block p {
    font-size: 15px;
    line-height: 1.8;
    color: #334155;
    margin-bottom: 10px;
}

.seo-block ul {
    padding-left: 18px;
    margin: 0;
}

.seo-block ul li {
    font-size: 15px;
    line-height: 1.7;
    color: #334155;
    margin-bottom: 6px;
}

/* ---------- FOOTER ---------- */
footer {
    background: #020617;
    color: #cbd5f5;
    padding: 18px 10px;
    text-align: center;
    font-size: 13px;
    margin-top: auto;
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 600px) {
    .seo-container h2 {
        font-size: 22px;
    }

    .clock {
        font-size: 40px;
    }
}