/* ============================================================
     SECTION HEAD
     ============================================================ */
  .block { padding: 100px 0; }
  .block.alt { background: var(--surface); }
  .section-head {
    margin-bottom: 64px;
    max-width: 880px;
  }
  .section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
  .kicker {
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    display: inline-block;
    margin-bottom: 16px;
  }
  .kicker.orange { color: var(--orange); }
  .kicker.pink { color: var(--pink); }
  .kicker.navy { color: var(--navy); }
  .kicker.magenta { color: var(--magenta); }
  .section-title {
    font-size: clamp(28px, 3.5vw, 52px);
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 24px;
    letter-spacing: -0.015em;
  }
  .section-title .gr {
    background: var(--grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
  .section-lead {
    font-size: 18px;
    color: var(--text-muted);
    max-width: 720px;
    line-height: 1.7;
  }
  .section-head.center .section-lead { margin-left: auto; margin-right: auto; }

  /* ============================================================
     CONCEPTS GRID — mitä AI-mainonta tarkoittaa
     ============================================================ */
  .concept-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
  .concept-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 22px;
    padding: 36px 30px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.3s, border-color 0.3s;
    position: relative;
    overflow: hidden;
  }
  .concept-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--sh-lg);
    border-color: var(--pink-soft);
  }
  .concept-card::before {
    content: '';
    position: absolute;
    top: -80px;
    right: -80px;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    opacity: 0.06;
    background: var(--grad);
    pointer-events: none;
  }
  .concept-icon {
    width: 52px;
    height: 52px;
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }
  .concept-icon.grad { background: var(--grad); color: #fff; }
  .concept-icon.pink { background: var(--pink-50); color: var(--pink); }
  .concept-icon.orange { background: var(--orange-50); color: var(--orange); }
  .concept-icon.navy { background: var(--navy-50); color: var(--navy); }
  .concept-icon.magenta { background: #fce9fc; color: var(--magenta); }
  .concept-card h3 {
    font-size: 20px;
    font-weight: 800;
    color: var(--navy-dark);
    letter-spacing: -0.01em;
    line-height: 1.25;
  }
  .concept-card p {
    font-size: 15px;
    color: var(--text-muted);
    line-height: 1.65;
    flex: 1;
  }
  .concept-tag {
    display: inline-flex;
    align-self: flex-start;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
  }
  .concept-tag.google { background: rgba(66, 133, 244, 0.10); color: #4285F4; }
  .concept-tag.ai { background: var(--pink-50); color: var(--pink); }
  .concept-tag.auto { background: var(--orange-50); color: var(--orange); }

  /* ============================================================
     KANAVAOSIO — teksti ja kuvitus rinnakkain (ChatGPT-mainokset)
     ============================================================ */
  .channel-section {
    padding: 110px 0;
    background: linear-gradient(180deg, var(--bg) 0%, var(--surface) 100%);
    position: relative;
    overflow: hidden;
  }
  .channel-section::before {
    content: '';
    position: absolute;
    top: -140px;
    right: -160px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(216, 35, 205, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
  }
  .channel-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 72px;
    align-items: center;
    position: relative;
    z-index: 2;
  }
  .channel-text .kicker { color: var(--magenta); }
  .channel-text h2 {
    font-size: clamp(28px, 3.2vw, 46px);
    font-weight: 900;
    line-height: 1.15;
    letter-spacing: -0.015em;
    color: var(--navy-dark);
    margin-bottom: 22px;
  }
  .channel-text h2 .gr {
    background: var(--grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
  .channel-text p {
    font-size: 17px;
    line-height: 1.7;
    color: var(--text-muted);
    margin-bottom: 16px;
  }
  .channel-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
    margin-top: 32px;
  }
  .channel-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 18px 16px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.2s, border-color 0.2s;
  }
  .channel-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--sh-md);
    border-color: var(--pink-soft);
  }
  .channel-card-icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--navy-dark);
  }
  .channel-card h4 {
    font-size: 14px;
    font-weight: 800;
    color: var(--navy-dark);
    line-height: 1.3;
  }
  .channel-card p {
    font-size: 12.5px;
    color: var(--text-muted);
    line-height: 1.5;
    margin: 0;
  }
  .channel-note {
    margin-top: 24px;
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-muted);
  }
  .channel-note a,
  .section-lead a { color: var(--magenta); font-weight: 700; }

  /* ChatGPT-mainoksen havainnollistus: keskustelu ja sponsoroitu kortti */
  .chat-mock {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 28px;
    box-shadow: var(--sh-lg);
    display: flex;
    flex-direction: column;
    gap: 16px;
  }
  .chat-mock-bar {
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-muted);
  }
  .chat-mock-ask {
    align-self: flex-end;
    max-width: 82%;
    background: var(--surface);
    border-radius: 18px 18px 4px 18px;
    padding: 12px 16px;
    font-size: 14.5px;
    line-height: 1.5;
    color: var(--navy-dark);
  }
  .chat-mock-answer {
    font-size: 14.5px;
    line-height: 1.65;
    color: var(--text);
    margin: 0;
  }
  .chat-mock-ad {
    display: grid;
    grid-template-columns: 64px 1fr;
    gap: 14px;
    align-items: center;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 14px;
    background: linear-gradient(135deg, #fff 0%, var(--pink-50) 100%);
  }
  .chat-mock-ad-img {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    background: var(--grad);
  }
  .chat-mock-ad-tag {
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
  }
  .chat-mock-ad strong {
    display: block;
    font-size: 15px;
    color: var(--navy-dark);
    margin: 2px 0;
  }
  .chat-mock-ad span:last-child { font-size: 13px; color: var(--text-muted); line-height: 1.5; }
  .chat-mock-caption {
    font-size: 12px;
    line-height: 1.6;
    color: var(--text-muted);
    margin-top: 14px;
    text-align: center;
  }

  /* Neljän kortin ruudukko (tekoälyllä tuotetut mainokset) */
  .concept-grid--4 { grid-template-columns: repeat(4, 1fr); }
  .concept-links {
    margin-top: auto;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
  .concept-card .concept-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 700;
    color: var(--magenta);
    text-decoration: none;
  }
  .concept-card .concept-link:hover { text-decoration: underline; }

  /* ============================================================
     AI-HI FORM (Kipinä-kehote)
     ============================================================ */
  @media (max-width: 600px) {
    .ai-hi { justify-content: center; }
    .ai-hi:hover .ai-hi-input,
    .ai-hi:focus-within .ai-hi-input { width: 140px; }
  }