* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #f4f6f8;
    color: #20252b;
}

header {
    height: 70px;
    background: #ffffff;
    border-bottom: 1px solid #e4e7eb;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 6%;
}

.logo {
    font-size: 22px;
    font-weight: 800;
    letter-spacing: -1px;
}
.logo span { font-weight: 400; margin-left: 3px; }

.price { color: #667085; font-size: 14px; }

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 50px 20px;
}

.hero {
    padding: 30px 0 40px;
}

.tag {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 1.5px;
    color: #5b6470;
}

h1 {
    font-size: clamp(34px, 6vw, 58px);
    line-height: 1.02;
    max-width: 800px;
    margin: 15px 0;
}

.hero p {
    max-width: 700px;
    font-size: 18px;
    line-height: 1.6;
    color: #667085;
}

.card {
    background: white;
    padding: 32px;
    border-radius: 18px;
    box-shadow: 0 10px 30px rgba(0,0,0,.06);
}

.card h2 { margin-top: 0; }

.grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}

label {
    display: block;
    margin: 18px 0;
    font-weight: 600;
    font-size: 14px;
}

input, textarea {
    display: block;
    width: 100%;
    margin-top: 8px;
    padding: 13px 14px;
    border: 1px solid #d8dde3;
    border-radius: 9px;
    font: inherit;
    background: #fff;
}

textarea {
    min-height: 100px;
    resize: vertical;
}

button, .button {
    border: 0;
    cursor: pointer;
    text-decoration: none;
}

.primary {
    display: inline-block;
    background: #111827;
    color: white;
    padding: 15px 22px;
    border-radius: 9px;
    font-weight: 700;
    margin-top: 10px;
}

.primary:hover { opacity: .9; }

.article-page {
    max-width: 950px;
    margin: 35px auto;
    padding: 0 18px 60px;
}

.preview-banner {
    background: #111827;
    color: white;
    padding: 18px 22px;
    border-radius: 12px;
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    margin-bottom: 25px;
}

.preview-banner span { color: #d5d9df; }

.paper {
    background: white;
    padding: 70px 90px;
    box-shadow: 0 8px 30px rgba(0,0,0,.08);
    line-height: 1.8;
}

.paper h2 {
    margin-top: 42px;
    font-size: 18px;
}

.paper p {
    text-align: justify;
}

.cover {
    min-height: 700px;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.cover p { text-align: center; }

.cover h1, .cover h2 {
    margin: 10px auto;
    max-width: 650px;
}

.checkout-teaser {
    margin-top: 25px;
    background: white;
    text-align: center;
    padding: 35px;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0,0,0,.06);
}

.big-price {
    font-size: 38px;
    font-weight: 800;
    margin: 15px;
}

.checkout-teaser small {
    display: block;
    margin-top: 14px;
    color: #667085;
}

.back {
    color: #20252b;
    text-decoration: none;
    font-weight: 600;
}

@media (max-width: 700px) {
    header { padding: 0 20px; }
    .price { display: none; }
    .grid { grid-template-columns: 1fr; }
    .card { padding: 22px; }
    .paper { padding: 35px 25px; }
}