:root {
      --bg: #f5f7f8;
      --card: #ffffff;
      --text: #172126;
      --muted: #66757f;
      --accent: #1677ff;
      --accent-dark: #0e5fcf;
      --border: #dce3e7;
      --soft: #eef5ff;
      --success: #0b7a45;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      font-family: Arial, Helvetica, sans-serif;
      color: var(--text);
      background: var(--bg);
      line-height: 1.6;
    }
    .container { width: min(1080px, calc(100% - 32px)); margin: 0 auto; }
    header {
      background: #fff;
      border-bottom: 1px solid var(--border);
      position: sticky; top: 0; z-index: 10;
    }
    .nav {
      min-height: 66px; display: flex; align-items: center;
      justify-content: space-between; gap: 20px;
    }
    .logo { font-weight: 800; font-size: 20px; text-decoration: none; color: var(--text); }
    .logo span { color: var(--accent); }
    nav { display: flex; gap: 18px; flex-wrap: wrap; }
    nav a { color: var(--muted); text-decoration: none; font-size: 14px; }
    nav a:hover { color: var(--accent); }

    .unit-switch {
      display: inline-flex;
      align-items: center;
      gap: 0;
      background: #f1f4f6;
      border: 1px solid var(--border);
      border-radius: 10px;
      padding: 3px;
      margin-left: auto;
    }
    .unit-switch button {
      border: 0;
      background: transparent;
      color: var(--muted);
      padding: 7px 11px;
      border-radius: 7px;
      font-size: 13px;
      font-weight: 700;
      cursor: pointer;
    }
    .unit-switch button.active {
      background: #fff;
      color: var(--accent);
      box-shadow: 0 1px 4px rgba(20,40,55,.10);
    }

    .hero { padding: 56px 0 32px; text-align: center; }
    .eyebrow { color: var(--accent); font-weight: 700; font-size: 13px; text-transform: uppercase; letter-spacing: .08em; }
    h1 { font-size: clamp(34px, 5vw, 52px); margin: 10px 0 12px; line-height: 1.08; }
    .lead { max-width: 720px; margin: 0 auto; color: var(--muted); font-size: 18px; }

    .calculator {
      background: #f8fbff; border: 1px solid #dbe8f5;
      border-radius: 18px; padding: 26px; margin: 22px auto 20px;
      max-width: 960px; box-shadow: 0 8px 25px rgba(20,40,55,.045);
      text-align: left;
    }
    .calculator + .calculator { margin-top: 18px; }
    .calculator:nth-of-type(2) { background: #f8faf9; border-color: #dce8e1; }
    .calculator:nth-of-type(3) { background: #fbf9f6; border-color: #ebe2d8; }
    .calc-title { margin: 0 0 6px; font-size: 24px; }
    .calc-description { color: var(--muted); margin: 0 0 20px; }
    .grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .grid.two { grid-template-columns: repeat(2, 1fr); }
    label { display: block; font-size: 14px; font-weight: 700; margin-bottom: 7px; }
    .input-wrap { position: relative; }
    input, select {
      width: 100%; border: 1px solid var(--border); border-radius: 10px;
      padding: 13px 12px; font-size: 16px; background: #fff; color: var(--text);
    }
    input:focus, select:focus { outline: 3px solid rgba(22,119,255,.15); border-color: var(--accent); }
    .suffix {
      position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
      color: var(--muted); font-size: 13px; pointer-events: none;
    }
    .has-suffix input { padding-right: 82px; }
    .actions { display: flex; gap: 12px; align-items: center; margin-top: 20px; flex-wrap: wrap; }
    button.primary {
      border: 0; background: var(--accent); color: #fff; padding: 14px 24px;
      border-radius: 10px; font-size: 16px; font-weight: 700; cursor: pointer;
    }
    button.primary:hover { background: var(--accent-dark); }
    button.reset {
      background: transparent; color: var(--muted); border: 1px solid var(--border);
      padding: 13px 20px; border-radius: 10px; font-size: 15px; cursor: pointer;
    }
    .results {
      display: none; margin-top: 24px; background: var(--soft);
      border-radius: 14px; padding: 20px;
    }
    .results.show { display: block; }
    .result-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
    .result { background: #fff; border-radius: 12px; padding: 15px; border: 1px solid #d9e7fa; }
    .result .label { font-size: 13px; color: var(--muted); }
    .result .value { font-size: 25px; font-weight: 800; margin-top: 3px; }
    .note { color: var(--muted); font-size: 13px; margin-top: 12px; }

    .popular { padding: 36px 0 18px; }
    h2 { font-size: 30px; line-height: 1.2; margin: 0 0 16px; }
    .cards { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
    .card {
      background: #fff; border: 1px solid var(--border); border-radius: 12px;
      padding: 18px; text-decoration: none; color: var(--text); min-height: 95px;
      display: flex; align-items: center; font-weight: 700;
    }
    .card:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

    article { background: #fff; margin: 36px 0 50px; border: 1px solid var(--border); border-radius: 18px; padding: clamp(24px, 5vw, 48px); }
    article h2 { margin-top: 38px; }
    article h2:first-child { margin-top: 0; }
    article h3 { margin-top: 26px; font-size: 21px; }
    article p, article li { color: #44515a; }
    .formula {
      background: #f3f5f7; border-left: 4px solid var(--accent);
      padding: 16px 18px; border-radius: 8px; font-weight: 700;
      margin: 14px 0;
    }
    details { border-top: 1px solid var(--border); padding: 16px 0; }
    summary { cursor: pointer; font-weight: 700; }
    footer { border-top: 1px solid var(--border); padding: 28px 0; color: var(--muted); font-size: 14px; }

    @media (max-width: 900px) {
      .nav { flex-wrap: wrap; padding: 10px 0; }
      .unit-switch { margin-left: 0; }
      .cards { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 760px) {
      .nav { align-items: flex-start; flex-direction: column; }
      .hero { padding-top: 36px; }
      .grid, .grid.two, .result-grid { grid-template-columns: 1fr; }
      .cards { grid-template-columns: 1fr 1fr; }
      .calculator { padding: 18px; }
    }
    @media (max-width: 430px) { .cards { grid-template-columns: 1fr; } }


/* ==========================================================================
   Изолированные стили для страницы статьи (how-to-retrieve-keys-mini-cooper.html)
   ========================================================================== */

.article-page-body {
    background-color: #f9f9f9 !important;
}

.article-page {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

.article-page header {
    background-color: #1a252f;
    color: #fff;
    padding: 30px 20px;
    text-align: center;
    border-radius: 8px;
    margin-bottom: 30px;
    position: static; /* Отмена sticky из глобальных стилей */
    border-bottom: none;
}

.article-page header h1 {
    margin: 0;
    font-size: 24px;
    color: #fff;
}

.article-page article {
    background: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    margin: 0;
    border: none;
}

.article-page h2 {
    color: #2c3e50;
    border-bottom: 2px solid #ecf0f1;
    padding-bottom: 8px;
    margin-top: 30px;
    font-size: 24px;
}

.article-page .cta-box {
    background-color: #ebf5fb;
    border-left: 5px solid #3498db;
    padding: 20px;
    margin: 30px 0;
    border-radius: 0 8px 8px 0;
}

.article-page .cta-box a {
    color: #2980b9;
    font-weight: bold;
    text-decoration: underline;
}

.article-page .faq-section {
    background-color: #fcfcfc;
    border: 1px solid #e1e8ed;
    padding: 20px;
    border-radius: 8px;
    margin-top: 30px;
}

.article-page .faq-section h2 {
    margin-top: 0;
}

.article-page footer {
    text-align: center;
    margin-top: 40px;
    font-size: 14px;
    color: #7f8c8d;
    border-top: none;
    padding: 0;
}