:root {
    --bg: #ffffff;
    --surface: #f4f3f0;
    --surface-alt: #eae9e5;
    --border: #d4d2cb;
    --border-strong: #a8a59e;
    --text: #1a1a18;
    --text-mid: #5c5a54;
    --text-muted: #8a877f;
    --accent: #2c5aa0;
    --accent-hover: #1e4380;
    --green: #2a7d4f;
    --green-bg: #e8f5ed;
    --navy: #1b2a4a;
    --nav-bg: #2b2b28;
    --yellow: #c8a415;
    --yellow-bg: #fdf8e8;
    --red: #b5342a;
    --mono: 'IBM Plex Mono', monospace;
    --sans: 'IBM Plex Sans', sans-serif;
  }

  * { margin: 0; padding: 0; box-sizing: border-box; }

  body {
    font-family: var(--sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
  }

  /* ── NAV ── */
  nav {
    background: var(--nav-bg);
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 48px;
    border-bottom: 2px solid #444;
  }
  .nav-brand {
    font-family: var(--mono);
    font-weight: 700;
    font-size: 0.95rem;
    color: #fff;
    letter-spacing: 0.05em;
    text-decoration: none;
  }
  .nav-links {
    display: flex;
    gap: 0;
    list-style: none;
  }
  .nav-links a {
    font-family: var(--mono);
    font-size: 0.78rem;
    font-weight: 500;
    color: #b0ada6;
    text-decoration: none;
    padding: 0 1rem;
    height: 48px;
    display: flex;
    align-items: center;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    transition: color 0.15s, background 0.15s;
    border-left: 1px solid #3a3a37;
  }
  .nav-links a:hover,
  .nav-links a.active {
    color: #fff;
    background: rgba(255,255,255,0.06);
  }

  /* ── LAYOUT ── */
  .container {
    max-width: 960px;
    margin: 0 auto;
    padding: 2rem 1.5rem 3rem;
  }

  .page-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
  }
  .page-header h1 {
    font-family: var(--mono);
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    color: var(--text);
  }
  .page-header p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
  }

  /* ── PRODUCT CARDS ── */
  .products {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1.25rem;
    margin-bottom: 2rem;
  }

  .product-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 3px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
  }

  .card-header {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: baseline;
  }
  .card-header h2 {
    font-family: var(--mono);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    text-transform: uppercase;
  }
  .price-tag {
    font-family: var(--mono);
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text);
  }
  .price-tag .period {
    font-size: 0.7rem;
    font-weight: 400;
    color: var(--text-muted);
  }

  .card-body {
    padding: 1rem 1.25rem;
    flex: 1;
  }
  .card-body ul {
    list-style: none;
    font-size: 0.82rem;
    color: var(--text-mid);
  }
  .card-body li {
    padding: 0.3rem 0;
    padding-left: 1.1rem;
    position: relative;
    line-height: 1.45;
  }
  .card-body li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--green);
    font-weight: 600;
    font-size: 0.75rem;
  }

  .card-footer {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border);
    background: var(--surface-alt);
  }

  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 0.65rem 1.5rem;
    font-family: var(--mono);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    border: none;
    border-radius: 2px;
    cursor: pointer;
    transition: background 0.15s, transform 0.1s;
    text-decoration: none;
  }
  .btn:active { transform: scale(0.98); }

  .btn-primary {
    background: var(--accent);
    color: #fff;
  }
  .btn-primary:hover { background: var(--accent-hover); }

  .btn-secondary {
    background: var(--nav-bg);
    color: #fff;
  }
  .btn-secondary:hover { background: #1a1a18; }

  .payment-methods {
    display: flex;
    gap: 0.4rem;
    justify-content: center;
    margin-top: 0.6rem;
  }
  .payment-methods span {
    font-family: var(--mono);
    font-size: 0.6rem;
    font-weight: 600;
    color: var(--text-muted);
    padding: 0.15rem 0.4rem;
    border: 1px solid var(--border);
    border-radius: 2px;
    background: #fff;
    letter-spacing: 0.03em;
  }

  /* ── PROMO TAG ── */
  .promo-tag {
    display: inline-block;
    font-family: var(--mono);
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 0.2rem 0.5rem;
    border-radius: 2px;
    margin-bottom: 0.4rem;
  }
  .promo-intro {
    background: var(--yellow-bg);
    color: #8a6d00;
    border: 1px solid #e6d580;
  }

  /* ── TRIAL BANNER ── */
  .trial-banner {
    background: var(--surface);
    border: 1px solid var(--border);
    border-left: 3px solid var(--green);
    border-radius: 3px;
    padding: 1rem 1.25rem;
    margin-bottom: 2rem;
  }
  .trial-banner h3 {
    font-family: var(--mono);
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--green);
    margin-bottom: 0.5rem;
  }
  .trial-banner p, .trial-banner li {
    font-size: 0.82rem;
    color: var(--text-mid);
    line-height: 1.5;
  }
  .trial-banner ul {
    list-style: none;
    margin-top: 0.4rem;
  }
  .trial-banner li {
    padding: 0.2rem 0 0.2rem 1.1rem;
    position: relative;
  }
  .trial-banner li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--green);
    font-weight: 600;
    font-size: 0.75rem;
  }

  /* ── LOWER SECTIONS ── */
  .lower-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
  }

  .section-box {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 3px;
    overflow: hidden;
  }
  .section-box-header {
    padding: 0.75rem 1.25rem;
    border-bottom: 1px solid var(--border);
    background: var(--surface-alt);
  }
  .section-box-header h3 {
    font-family: var(--mono);
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text);
  }
  .section-box-body {
    padding: 1.25rem;
    font-family: var(--mono);
  }

  /* ── FORMS ── */
  .form-group {
    margin-bottom: 0.9rem;
  }
  .form-group:last-child {
    margin-bottom: 0;
  }
  label {
    display: block;
    font-family: var(--mono);
    font-size: 0.72rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.35rem;
  }
  input[type="text"],
  input[type="password"],
  input[type="email"] {
    width: 100%;
    padding: 0.55rem 0.75rem;
    font-family: var(--mono);
    font-size: 0.82rem;
    border: 1px solid var(--border);
    border-radius: 2px;
    background: #fff;
    color: var(--text);
    outline: none;
    transition: border-color 0.15s;
  }
  input:focus {
    border-color: var(--accent);
  }
  .form-actions {
    margin-top: 1rem;
  }
  .btn-sm {
    padding: 0.5rem 1.25rem;
    font-size: 0.75rem;
  }
  .form-link {
    display: block;
    margin-top: 0.6rem;
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--accent);
    text-decoration: none;
  }
  .form-link:hover {
    text-decoration: underline;
  }

  /* ── FOOTER ── */
  footer {
    margin-top: 2.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    font-family: var(--mono);
    font-size: 0.7rem;
    color: var(--text-muted);
    letter-spacing: 0.02em;
  }
  footer a {
    color: var(--accent);
    text-decoration: none;
  }
  footer a:hover { text-decoration: underline; }

  /* ── RESPONSIVE ── */
  @media (max-width: 700px) {
    .products,
    .lower-grid {
      grid-template-columns: 1fr;
    }
    nav {
      padding: 0 1rem;
    }
    .nav-links a {
      padding: 0 0.65rem;
      font-size: 0.72rem;
    }
  }