/* =====================================================
       Products · Single-page (White-first)
       ===================================================== */
    :root {
      --p-bg: #ffffff;
      --p-bg-soft: #f6f7f9;
      --p-bg-mute: #eef1f5;
      --p-text: #171a20;
      --p-text-soft: #5c5e62;
      --p-text-mute: #8a8f99;
      --p-border: #e3e6eb;
      --p-brand: #4BA3DC;
      --p-brand-deep: #2f7fbf;
      --p-accent-r: #3E6AE1;
      --p-accent-a: #6E58E0;
      --p-accent-c: #2FA37A;
      --p-accent-s: #E29335;
      --p-display: 'Inter', 'Noto Sans SC', sans-serif;
      --p-cn: 'Noto Sans SC', sans-serif;
    }

    html { scroll-behavior: smooth; }
    body[data-page="products"] { background: var(--p-bg); color: var(--p-text); }

    .p-shell { width: min(1440px, calc(100% - 8vw)); margin: 0 auto; }

    /* shared atoms ---------------------------------------- */
    .p-kicker {
      font-family: var(--p-display);
      font-size: 12px; font-weight: 600;
      letter-spacing: 0.34em; text-transform: uppercase;
      color: var(--p-brand);
    }
    .p-h1 {
      font-family: var(--p-cn);
      font-size: clamp(40px, 5vw, 72px);
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.1;
      color: var(--p-text);
    }
    .p-h2 {
      font-family: var(--p-cn);
      font-size: clamp(32px, 3.4vw, 48px);
      font-weight: 700;
      letter-spacing: -0.01em;
      line-height: 1.15;
      color: var(--p-text);
    }
    .p-lead {
      font-family: var(--p-cn);
      font-size: clamp(16px, 1.15vw, 19px);
      color: var(--p-text-soft);
      line-height: 1.7;
      max-width: 640px;
    }
    .p-cta-row {
      display: flex; flex-wrap: wrap; gap: 14px;
    }
    .p-btn {
      display: inline-flex; align-items: center; justify-content: center;
      min-height: 46px; min-width: 196px; padding: 0 36px;
      border-radius: 8px; border: none; cursor: pointer;
      font-family: var(--p-cn);
      font-size: 15px; font-weight: 500;
      letter-spacing: 0.04em;
      transition: background 200ms ease, color 200ms ease, transform 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
    }
    .p-btn--primary { background: #3E6AE1; color: #fff; box-shadow: 0 8px 24px rgba(62, 106, 225, 0.28); }
    .p-btn--primary:hover { background: #2d55c7; transform: translateY(-1px); }
    .p-btn--ghost { background: transparent; color: var(--p-text); border: 1px solid var(--p-border); }
    .p-btn--ghost:hover { background: var(--p-bg-soft); border-color: var(--p-text); }
    .p-btn--brand { background: #3E6AE1; color: #fff; box-shadow: 0 8px 24px rgba(62, 106, 225, 0.28); }
    .p-btn--brand:hover { background: #2d55c7; transform: translateY(-1px); }

    /* ===== Hero ===== */
    .p-hero {
      position: relative;
      padding: 112px 0 64px;
      background:
        radial-gradient(circle at 80% 10%, rgba(75,163,220,0.08), transparent 50%),
        radial-gradient(circle at 10% 90%, rgba(92,184,92,0.05), transparent 50%),
        #fff;
      overflow: hidden;
    }
    .p-hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 1fr;
      gap: 80px;
      align-items: center;
    }
    .p-hero-copy h1 { margin: 18px 0 22px; }
    .p-hero-highlight { color: var(--p-brand); }
    .p-hero-lead { margin-bottom: 32px; }
    .p-hero-meta {
      display: flex; flex-wrap: wrap; gap: 28px;
      padding-top: 28px; margin-top: 32px;
      border-top: 1px solid var(--p-border);
    }
    .p-hero-meta-item { display: flex; flex-direction: column; gap: 4px; }
    .p-hero-meta-num {
      font-family: var(--p-display);
      font-size: 28px; font-weight: 700; color: var(--p-text);
      letter-spacing: -0.01em;
    }
    .p-hero-meta-label {
      font-family: var(--p-cn);
      font-size: 12px; color: var(--p-text-mute);
      letter-spacing: 0.06em;
    }

    .p-hero-stage {
      position: relative;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
    }
    .p-hero-stage img {
      width: 100%; height: 220px; object-fit: contain;
      background: linear-gradient(180deg, #fafbfc 0%, #f0f3f7 100%);
      border-radius: 14px;
      padding: 18px;
      transition: transform 360ms ease;
    }
    .p-hero-stage a { display: block; position: relative; text-decoration: none; }
    .p-hero-stage a:hover img { transform: translateY(-4px); }
    .p-hero-stage-label {
      position: absolute; bottom: 12px; left: 16px;
      font-family: var(--p-display);
      font-size: 13px; font-weight: 600;
      color: var(--p-text);
      letter-spacing: 0.05em;
    }
    .p-hero-stage-label small {
      display: block;
      font-family: var(--p-cn);
      font-size: 11px; font-weight: 400;
      color: var(--p-text-mute);
      letter-spacing: 0.04em;
      margin-top: 2px;
    }

    /* ===== Compare Matrix ===== */
    .p-compare {
      padding: 100px 0 110px;
      background: var(--p-bg-soft);
      border-top: 1px solid var(--p-border);
      border-bottom: 1px solid var(--p-border);
    }
    .p-section-head {
      max-width: 760px;
      margin: 0 auto 56px;
      text-align: center;
    }
    .p-section-head h2 { margin: 14px 0 16px; }
    .p-section-head p { margin: 0 auto; }

    .p-cmp-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .p-cmp-card {
      background: #fff;
      border: 1px solid var(--p-border);
      border-radius: 16px;
      padding: 28px 24px 24px;
      display: flex; flex-direction: column;
      transition: transform 220ms ease, box-shadow 220ms ease, border-color 220ms ease;
      text-decoration: none; color: inherit;
    }
    .p-cmp-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 18px 40px rgba(23,26,32,0.08);
      border-color: var(--p-brand);
    }
    .p-cmp-card[data-tier="r"] .p-cmp-letter { color: var(--p-accent-r); }
    .p-cmp-card[data-tier="a"] .p-cmp-letter { color: var(--p-accent-a); }
    .p-cmp-card[data-tier="c"] .p-cmp-letter { color: var(--p-accent-c); }
    .p-cmp-card[data-tier="s"] .p-cmp-letter { color: var(--p-accent-s); }

    .p-cmp-imgwrap {
      height: 180px;
      display: flex; align-items: center; justify-content: center;
      margin-bottom: 20px;
      background: linear-gradient(180deg, #fafbfc 0%, #f0f3f7 100%);
      border-radius: 10px;
    }
    .p-cmp-imgwrap img { max-height: 100%; max-width: 100%; object-fit: contain; }

    .p-cmp-name {
      font-family: var(--p-display);
      font-size: 26px; font-weight: 700;
      letter-spacing: -0.01em;
      margin-bottom: 4px;
    }
    .p-cmp-letter { font-weight: 700; }
    .p-cmp-tier {
      font-family: var(--p-cn);
      font-size: 13px; color: var(--p-text-mute);
      letter-spacing: 0.04em;
      margin-bottom: 18px;
    }
    .p-cmp-tags {
      display: flex; flex-direction: column; gap: 10px;
      margin-bottom: 22px;
      padding-top: 18px;
      border-top: 1px solid var(--p-border);
    }
    .p-cmp-tag {
      display: flex; justify-content: space-between; align-items: baseline;
      font-family: var(--p-cn);
      font-size: 13px;
    }
    .p-cmp-tag-k { color: var(--p-text-mute); }
    .p-cmp-tag-v { color: var(--p-text); font-weight: 500; text-align: right; }
    .p-cmp-price {
      font-family: var(--p-display);
      font-size: 22px; font-weight: 700;
      color: var(--p-text);
      letter-spacing: -0.01em;
      margin-top: auto;
      padding-top: 18px;
      border-top: 1px solid var(--p-border);
    }
    .p-cmp-price small {
      font-family: var(--p-cn);
      font-size: 12px; color: var(--p-text-mute);
      font-weight: 400; margin-left: 4px;
    }
    .p-cmp-jump {
      display: flex; align-items: center; gap: 6px;
      margin-top: 12px;
      font-family: var(--p-cn);
      font-size: 13px; color: var(--p-brand);
      font-weight: 500;
    }
    .p-cmp-jump i { font-size: 16px; }

    /* ===== Product Detail · Flow R / A / C / S ===== */
    .p-detail {
      padding: 120px 0;
      background: #fff;
      scroll-margin-top: 80px;
    }
    .p-detail--soft { background: var(--p-bg-soft); border-top: 1px solid var(--p-border); border-bottom: 1px solid var(--p-border); }
    .p-detail--reverse .p-detail-grid { direction: rtl; }
    .p-detail--reverse .p-detail-grid > * { direction: ltr; }
    .p-detail[data-product="a"] .p-bullets i { color: var(--p-accent-a); }
    .p-detail[data-product="c"] .p-bullets i { color: var(--p-accent-c); }
    .p-detail[data-product="s"] .p-bullets i { color: var(--p-accent-s); }
    /* 按钮统一为品牌蓝（per-product accent 只用在 bullet 图标，不上按钮）*/

    .p-detail-head {
      display: flex; align-items: baseline; justify-content: space-between;
      flex-wrap: wrap; gap: 16px;
      margin-bottom: 48px;
      padding-bottom: 28px;
      border-bottom: 1px solid var(--p-border);
    }
    .p-detail-tag {
      font-family: var(--p-cn);
      font-size: 13px; font-weight: 500;
      color: var(--p-text-mute);
      letter-spacing: 0.06em;
    }
    .p-detail-name {
      font-family: var(--p-display);
      font-size: clamp(40px, 4vw, 56px);
      font-weight: 700;
      letter-spacing: -0.02em;
    }
    .p-detail-name .lr { color: var(--p-accent-r); }
    .p-detail-name .la { color: var(--p-accent-a); }
    .p-detail-name .lc { color: var(--p-accent-c); }
    .p-detail-name .ls { color: var(--p-accent-s); }
    .p-detail-sub {
      font-family: var(--p-cn);
      font-size: 18px; color: var(--p-text-soft);
      margin-top: 6px;
    }
    .p-detail-price {
      font-family: var(--p-display);
      font-size: 32px; font-weight: 700;
      color: var(--p-text);
    }
    .p-detail-price small {
      font-family: var(--p-cn);
      font-size: 14px; font-weight: 400;
      color: var(--p-text-mute); margin-left: 4px;
    }

    .p-detail-grid {
      display: grid;
      grid-template-columns: 1.1fr 1fr;
      gap: 64px;
      align-items: start;
    }
    .p-detail-visual {
      background: linear-gradient(180deg, #fafbfc 0%, #eef1f5 100%);
      border-radius: 22px;
      padding: 40px;
      display: flex; align-items: center; justify-content: center;
      min-height: 520px;
      position: relative;
    }
    .p-detail-visual img { max-width: 100%; max-height: 520px; object-fit: contain; }
    .p-detail-visual::after {
      content: ''; position: absolute; inset: auto 24px 24px auto;
      width: 78px; height: 22px;
      background: rgba(23,26,32,0.04);
      border-radius: 4px;
    }

    .p-detail-info h3 {
      font-family: var(--p-cn);
      font-size: 28px; font-weight: 700;
      color: var(--p-text);
      line-height: 1.3;
      margin: 0 0 18px;
      letter-spacing: -0.01em;
    }
    .p-detail-info > p {
      font-family: var(--p-cn);
      font-size: 16px; line-height: 1.8;
      color: var(--p-text-soft);
      margin: 0 0 32px;
    }

    .p-stats {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
      margin: 32px 0 36px;
      padding: 24px 0;
      border-top: 1px solid var(--p-border);
      border-bottom: 1px solid var(--p-border);
    }
    .p-stat-num {
      font-family: var(--p-display);
      font-size: clamp(32px, 2.6vw, 40px);
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--p-text);
      line-height: 1.1;
    }
    .p-stat-num span {
      font-size: 14px; font-weight: 500;
      color: var(--p-text-mute);
      margin-left: 4px;
    }
    .p-stat-label {
      font-family: var(--p-cn);
      font-size: 13px; color: var(--p-text-mute);
      margin-top: 6px;
      letter-spacing: 0.02em;
    }

    .p-bullets { list-style: none; padding: 0; margin: 0 0 32px; }
    .p-bullets li {
      display: flex; align-items: flex-start; gap: 12px;
      padding: 10px 0;
      font-family: var(--p-cn);
      font-size: 15px; color: var(--p-text);
      line-height: 1.6;
    }
    .p-bullets i {
      color: var(--p-brand);
      font-size: 18px; flex-shrink: 0;
      margin-top: 2px;
    }
    .p-bullets b { font-weight: 600; }
    .p-bullets em { font-style: normal; color: var(--p-text-soft); }

    /* spec table */
    .p-specs {
      margin-top: 64px;
      padding-top: 56px;
      border-top: 1px solid var(--p-border);
    }
    .p-specs-title {
      font-family: var(--p-cn);
      font-size: 24px; font-weight: 700;
      color: var(--p-text);
      margin-bottom: 28px;
    }
    .p-specs-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px 32px;
    }
    .p-spec-cell { display: flex; flex-direction: column; gap: 6px; padding: 14px 0; border-top: 1px solid var(--p-border); }
    .p-spec-k {
      font-family: var(--p-cn);
      font-size: 12px; color: var(--p-text-mute);
      letter-spacing: 0.06em;
      text-transform: uppercase;
    }
    .p-spec-v {
      font-family: var(--p-cn);
      font-size: 15px; color: var(--p-text);
      font-weight: 500;
      line-height: 1.5;
    }

    /* === Full Technical Specs · 6-group cards === */
    .p-specs-groups {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 28px;
      margin-top: 28px;
    }
    .p-specs-group {
      background: #fff;
      border: 1px solid var(--p-border);
      border-radius: 12px;
      padding: 22px 24px 8px;
    }
    .p-specs-group-title {
      font-family: var(--p-cn);
      font-size: 12px; font-weight: 600;
      color: var(--p-brand);
      letter-spacing: 0.16em;
      text-transform: uppercase;
      margin-bottom: 14px;
      padding-bottom: 10px;
      border-bottom: 1px solid var(--p-border);
    }
    .p-specs-row {
      display: grid;
      grid-template-columns: 96px 1fr;
      gap: 16px;
      padding: 10px 0;
      border-bottom: 1px solid rgba(23,26,32,0.05);
      align-items: baseline;
    }
    .p-specs-row:last-child { border-bottom: none; }
    .p-specs-row-k {
      font-family: var(--p-cn);
      font-size: 12px; color: var(--p-text-mute);
      letter-spacing: 0.03em;
      font-weight: 500;
    }
    .p-specs-row-v {
      font-family: var(--p-cn);
      font-size: 13.5px; color: var(--p-text);
      font-weight: 500;
      line-height: 1.6;
      word-break: break-word;
    }
    .p-specs-row-v.is-mute { color: var(--p-text-mute); font-weight: 400; }

    /* === Accordion (native details/summary) === */
    .p-accordion {
      margin-top: 14px;
      border: 1px solid var(--p-border);
      border-radius: 10px;
      overflow: hidden;
      background: #fff;
    }
    .p-accordion summary {
      cursor: pointer;
      padding: 18px 24px;
      font-family: var(--p-cn);
      font-size: 15px; font-weight: 600;
      color: var(--p-text);
      list-style: none;
      display: flex; align-items: center; justify-content: space-between;
      transition: background 200ms ease;
    }
    .p-accordion summary::-webkit-details-marker { display: none; }
    .p-accordion summary::after {
      content: '+';
      font-size: 22px; font-weight: 300;
      color: var(--p-text-mute);
      transition: transform 220ms ease;
      line-height: 1;
    }
    .p-accordion[open] summary::after { transform: rotate(45deg); }
    .p-accordion summary:hover { background: #fafbfc; }
    .p-accordion-body {
      padding: 18px 24px 24px;
      font-family: var(--p-cn);
      font-size: 14px;
      color: var(--p-text-soft);
      line-height: 1.85;
      background: #fafbfc;
      border-top: 1px solid var(--p-border);
    }
    .p-accordion-body ol,
    .p-accordion-body ul {
      margin: 0; padding-left: 20px;
    }
    .p-accordion-body li { margin-bottom: 14px; }
    .p-accordion-body li:last-child { margin-bottom: 0; }
    .p-accordion-body li b { color: var(--p-text); font-weight: 600; display: block; margin-bottom: 4px; }
    .p-specs-note {
      margin-top: 22px;
      font-size: 12px;
      color: var(--p-text-mute);
      line-height: 1.7;
    }

    @media (max-width: 960px) {
      .p-specs-groups { grid-template-columns: 1fr; }
    }

    /* ===== Placeholder sections (A / C / S) ===== */
    .p-placeholder {
      padding: 96px 0;
      background: #fff;
      border-top: 1px solid var(--p-border);
      scroll-margin-top: 80px;
    }
    .p-placeholder--soft { background: var(--p-bg-soft); }
    .p-placeholder-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 64px;
      align-items: center;
    }
    .p-placeholder-visual {
      background: linear-gradient(180deg, #fafbfc 0%, #eef1f5 100%);
      border-radius: 18px;
      padding: 36px;
      min-height: 360px;
      display: flex; align-items: center; justify-content: center;
    }
    .p-placeholder-visual img { max-width: 100%; max-height: 320px; object-fit: contain; }
    .p-placeholder-info .p-detail-name { font-size: clamp(36px, 3.4vw, 48px); margin-top: 8px; }
    .p-placeholder-stub {
      margin-top: 28px;
      padding: 22px 24px;
      background: rgba(75,163,220,0.06);
      border-left: 3px solid var(--p-brand);
      border-radius: 0 8px 8px 0;
      font-family: var(--p-cn);
      font-size: 14px;
      color: var(--p-text-soft);
      line-height: 1.7;
    }
    .p-placeholder-stub b { color: var(--p-text); font-weight: 600; }

    /* ===== Decision Tree ===== */
    .p-decide {
      padding: 110px 0;
      background: var(--p-text);
      color: #fff;
    }
    .p-decide .p-section-head h2 { color: #fff; }
    .p-decide .p-section-head p { color: rgba(255,255,255,0.66); }
    .p-decide .p-kicker { color: var(--p-brand); }

    .p-decide-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
      margin-top: 56px;
    }
    .p-decide-card {
      background: rgba(255,255,255,0.04);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: 14px;
      padding: 32px 28px;
      display: flex; flex-direction: column;
      transition: background 220ms ease, border-color 220ms ease, transform 220ms ease;
    }
    .p-decide-card:hover {
      background: rgba(255,255,255,0.06);
      border-color: rgba(255,255,255,0.16);
      transform: translateY(-3px);
    }
    .p-decide-q {
      font-family: var(--p-cn);
      font-size: 12px; font-weight: 600;
      letter-spacing: 0.06em;
      color: var(--p-brand);
      text-transform: uppercase;
      margin-bottom: 14px;
    }
    .p-decide-title {
      font-family: var(--p-cn);
      font-size: 22px; font-weight: 600;
      line-height: 1.4;
      margin-bottom: 14px;
      color: #fff;
    }
    .p-decide-desc {
      font-family: var(--p-cn);
      font-size: 14px; line-height: 1.75;
      color: rgba(255,255,255,0.6);
      margin-bottom: 28px;
      flex: 1;
    }
    .p-decide-pick {
      display: flex; align-items: center; gap: 10px;
      padding-top: 22px;
      border-top: 1px solid rgba(255,255,255,0.08);
    }
    .p-decide-pick-label {
      font-family: var(--p-cn);
      font-size: 12px; color: rgba(255,255,255,0.5);
      letter-spacing: 0.06em;
    }
    .p-decide-pick-name {
      font-family: var(--p-display);
      font-size: 22px; font-weight: 700;
      letter-spacing: -0.01em;
      margin-left: auto;
    }
    .p-decide-pick-name .lr { color: #7CA5F0; }
    .p-decide-pick-name .la { color: #9C88F0; }
    .p-decide-pick-name .lc { color: #6FD4A8; }
    .p-decide-pick-name .ls { color: #F5B96A; }

    /* ===== CTA ===== */
    .p-cta {
      padding: 120px 0 100px;
      background: #fff;
      border-top: 1px solid var(--p-border);
      text-align: center;
    }
    .p-cta h2 { margin: 14px 0 20px; }
    .p-cta p { margin: 0 auto 36px; }
    .p-cta .p-cta-row { justify-content: center; }
    .p-cta-contact {
      margin-top: 28px;
      font-family: var(--p-cn);
      font-size: 14px;
      color: var(--p-text-mute);
    }
    .p-cta-contact a {
      color: var(--p-text); font-weight: 500;
      text-decoration: none;
      border-bottom: 1px solid var(--p-border);
      transition: border-color 200ms ease;
    }
    .p-cta-contact a:hover { border-color: var(--p-brand); }

    /* nav active state on this page */
    .nav-links a[data-nav-key="products"].is-active { color: var(--p-text); font-weight: 600; }

    /* ===== Modal (reused) ===== */
    .modal-overlay {
      position: fixed; inset: 0; z-index: 9000;
      background: rgba(0,0,0,0.55); backdrop-filter: blur(6px);
      display: flex; align-items: center; justify-content: center;
      opacity: 0; pointer-events: none; transition: opacity 260ms ease;
    }
    .modal-overlay.is-open { opacity: 1; pointer-events: auto; }
    .modal-panel {
      background: #fff; border-radius: 14px;
      width: min(720px, calc(100vw - 40px)); max-height: 90vh;
      overflow: hidden;
      position: relative; box-shadow: 0 32px 80px rgba(0,0,0,0.22);
    }
    .modal-body {
      padding: 52px 56px; max-height: 90vh; overflow-y: auto;
    }
    .modal-close {
      position: absolute; top: 20px; right: 20px;
      width: 36px; height: 36px; border-radius: 50%;
      background: rgba(23,26,32,0.06); color: #171A20;
      display: flex; align-items: center; justify-content: center;
      font-size: 18px; cursor: pointer; transition: background 220ms ease;
      border: none;
    }
    .modal-close:hover { background: rgba(23,26,32,0.12); }
    .modal-kicker { font-size: 11px; font-weight: 600; letter-spacing: 0.34em; text-transform: uppercase; color: #4BA3DC; margin-bottom: 10px; font-family: var(--p-display); }
    .modal-title { font-size: 28px; font-weight: 600; color: #171A20; margin-bottom: 8px; font-family: var(--p-cn); }
    .modal-copy { font-size: 14px; color: #5C5E62; margin-bottom: 28px; font-family: var(--p-cn); }
    .demo-form { display: flex; flex-direction: column; gap: 16px; }
    .form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
    .form-field { display: flex; flex-direction: column; gap: 6px; }
    .form-field span { font-size: 12px; font-weight: 500; color: #5C5E62; letter-spacing: 0.04em; font-family: var(--p-cn); }
    .form-field em { color: #E53E3E; font-style: normal; }
    .form-field input, .form-field select, .form-field textarea {
      padding: 11px 14px; border: 1px solid rgba(23,26,32,0.15); border-radius: 8px;
      font-size: 14px; color: #171A20; background: #fff; transition: border-color 220ms ease;
      font-family: var(--p-cn);
    }
    .form-field input:focus, .form-field select:focus, .form-field textarea:focus {
      outline: none; border-color: #4BA3DC;
    }
    .form-field--full { grid-column: 1 / -1; }
    .btn-submit {
      display: inline-flex; align-items: center; justify-content: center;
      min-height: 46px; min-width: 196px; padding: 0 36px; border-radius: 8px;
      background: #3E6AE1; color: #fff; font-size: 15px; font-weight: 500;
      cursor: pointer; border: none; transition: background 220ms ease, transform 220ms ease;
      align-self: flex-start;
      font-family: var(--p-cn);
      box-shadow: 0 8px 24px rgba(62, 106, 225, 0.28);
    }
    .btn-submit:hover { background: #2d55c7; transform: translateY(-1px); }

    /* ===== Responsive ===== */
    @media (max-width: 1100px) {
      .p-hero-grid { grid-template-columns: 1fr; gap: 56px; }
      .p-cmp-grid { grid-template-columns: repeat(2, 1fr); }
      .p-detail-grid { grid-template-columns: 1fr; gap: 40px; }
      .p-detail-visual { min-height: 380px; }
      .p-specs-grid { grid-template-columns: repeat(2, 1fr); }
      .p-decide-grid { grid-template-columns: 1fr; }
      .p-placeholder-grid { grid-template-columns: 1fr; gap: 32px; }
    }
    @media (max-width: 640px) {
      .p-hero { padding: 96px 0 48px; }
      .p-cmp-grid { grid-template-columns: 1fr; }
      .p-specs-grid { grid-template-columns: 1fr; }
      .p-detail-head { flex-direction: column; align-items: flex-start; }
      .p-hero-stage { grid-template-columns: 1fr 1fr; }
      .p-hero-stage img { height: 160px; }
    }