:root {
    --paper:       #F6F1E7;
    --paper-deep:  #EFE8D8;
    --paper-line:  #D9D0BC;
    --ink:         #151311;
    --ink-2:       #3C3833;
    --ink-mute:    #7A7267;
    --accent:      #0F4C4A;   /* 深い青緑 — 松葉・緑青の間 */
    --accent-ink:  #F6F1E7;
    --vermilion:   #B84A2E;   /* 挿し色：朱 */
    --serif-ja: "Shippori Mincho B1", "Hiragino Mincho ProN", "Yu Mincho", serif;
    --serif-en: "Fraunces", "Times New Roman", serif;
    --sans-ja:  "Noto Sans JP", "Hiragino Kaku Gothic ProN", system-ui, sans-serif;
  }

  *,*::before,*::after { box-sizing: border-box; }
  html { -webkit-font-smoothing: antialiased; }
  body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--sans-ja);
    font-weight: 400;
    line-height: 1.8;
    font-feature-settings: "palt";
    /* 紙の微細ノイズ */
    background-image:
      radial-gradient(circle at 20% 10%, rgba(184,74,46,0.03) 0, transparent 50%),
      radial-gradient(circle at 80% 80%, rgba(15,76,74,0.04) 0, transparent 50%);
  }

  a { color: inherit; text-decoration: none; }
  img { max-width: 100%; display: block; }

  .container { max-width: 1240px; margin: 0 auto; padding: 0 32px; }

  /* ============ Top bar ============ */
  .topbar {
    padding: 28px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--paper-line);
  }
  .brand {
    font-family: var(--serif-en);
    font-weight: 400;
    font-size: 18px;
    letter-spacing: 0.28em;
  }
  .brand em { font-style: italic; font-weight: 300; color: var(--ink-mute); margin-left: 10px; letter-spacing: 0.05em; }
  .topbar nav {
    font-size: 13px;
    letter-spacing: 0.1em;
    color: var(--ink-2);
    display: flex;
    gap: 32px;
  }
  .topbar nav a { position: relative; }
  .topbar nav a:hover { color: var(--accent); }

  /* ============ Hero ============ */
  .hero {
    padding: 80px 0 120px;
    position: relative;
    overflow: hidden;
  }
  .hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 64px;
    align-items: center;
  }
  .hero-eyebrow {
    font-family: var(--serif-en);
    font-style: italic;
    font-weight: 300;
    font-size: 15px;
    color: var(--ink-mute);
    margin-bottom: 28px;
    letter-spacing: 0.04em;
  }
  .hero-eyebrow::before {
    content: "";
    display: inline-block;
    width: 36px;
    height: 1px;
    background: var(--ink-mute);
    vertical-align: middle;
    margin-right: 14px;
  }
  .hero h1 {
    font-family: var(--serif-ja);
    font-weight: 600;
    font-size: clamp(40px, 5.2vw, 78px);
    line-height: 1.28;
    letter-spacing: -0.01em;
    margin: 0 0 32px;
    color: var(--ink);
  }
  .hero h1 .accent {
    color: var(--vermilion);
    font-weight: 700;
    position: relative;
  }
  .hero h1 .comma {
    color: var(--ink-mute);
    font-weight: 400;
  }
  .hero-lede {
    font-size: 17px;
    line-height: 2;
    color: var(--ink-2);
    max-width: 28em;
    margin: 0 0 40px;
  }
  .hero-meta {
    display: flex;
    gap: 28px;
    font-family: var(--serif-en);
    font-size: 12px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--ink-mute);
    padding-top: 24px;
    border-top: 1px solid var(--paper-line);
  }
  .hero-meta span b {
    display: block;
    font-family: var(--sans-ja);
    font-weight: 500;
    font-size: 14px;
    color: var(--ink);
    letter-spacing: 0;
    text-transform: none;
    margin-top: 4px;
  }

  .hero-visual {
    position: relative;
    aspect-ratio: 4/5;
  }
  .hero-frame img { object-position: center center; }
  .hero-frame {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #E8E0CC 0%, #D5CBB3 100%);
    border-radius: 2px;
    overflow: hidden;
    box-shadow:
      0 1px 0 rgba(0,0,0,0.04),
      0 30px 60px -20px rgba(21,19,17,0.25),
      0 60px 120px -40px rgba(21,19,17,0.18);
  }
  .hero-frame img { width: 100%; height: 100%; object-fit: cover; }
  .hero-frame-placeholder {
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    font-family: var(--serif-en);
    font-style: italic;
    color: rgba(21,19,17,0.35);
    font-size: 14px;
    text-align: center;
    padding: 20px;
  }
  .hero-caption {
    position: absolute;
    right: -20px;
    bottom: -40px;
    background: var(--ink);
    color: var(--paper);
    padding: 20px 28px;
    max-width: 260px;
    font-size: 12px;
    line-height: 1.7;
    letter-spacing: 0.02em;
  }
  .hero-caption .fig {
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 11px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: rgba(246,241,231,0.5);
    display: block;
    margin-bottom: 6px;
  }

  /* CTAs */
  .cta-row {
    display: flex;
    gap: 18px;
    align-items: center;
    flex-wrap: wrap;
  }
  .btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 16px 28px;
    font-family: var(--sans-ja);
    font-weight: 500;
    font-size: 14px;
    letter-spacing: 0.08em;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 300ms cubic-bezier(.2,.7,.2,1);
  }
  .btn-primary {
    background: var(--ink);
    color: var(--paper);
  }
  .btn-primary:hover { background: var(--accent); }
  .btn-primary::after {
    content: "→";
    font-family: var(--serif-en);
    font-size: 18px;
    transition: transform 300ms;
  }
  .btn-primary:hover::after { transform: translateX(4px); }
  .btn-ghost {
    background: transparent;
    color: var(--ink);
    border-color: var(--paper-line);
  }
  .btn-ghost:hover { border-color: var(--ink); }

  /* ============ Section header (editorial) ============ */
  .section { padding: 140px 0; border-top: 1px solid var(--paper-line); }
  .section-deep { background: var(--paper-deep); }
  .sec-head {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 56px;
    align-items: end;
    margin-bottom: 80px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--paper-line);
  }
  .sec-num {
    font-family: var(--serif-en);
    font-weight: 300;
    font-size: 96px;
    line-height: 0.9;
    color: var(--ink);
    font-variant-numeric: oldstyle-nums;
  }
  .sec-num small {
    display: block;
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--ink-mute);
    text-transform: uppercase;
    margin-top: 10px;
    font-style: italic;
    font-weight: 400;
  }
  .sec-title h2 {
    font-family: var(--serif-ja);
    font-size: clamp(32px, 3.6vw, 48px);
    font-weight: 500;
    margin: 0;
    line-height: 1.35;
    letter-spacing: -0.005em;
  }
  .sec-title p {
    margin: 20px 0 0;
    color: var(--ink-2);
    font-size: 16px;
    max-width: 38em;
  }

  /* ============ Pricing (松竹梅) ============ */
  .plans {
    display: grid;
    grid-template-columns: 1fr 1.08fr 1fr;
    gap: 0;
    align-items: stretch;
  }
  .plan {
    padding: 48px 40px 44px;
    background: var(--paper);
    border: 1px solid var(--paper-line);
    display: flex;
    flex-direction: column;
    position: relative;
    transition: transform 400ms cubic-bezier(.2,.7,.2,1);
  }
  .plan + .plan { border-left: none; }
  .plan-rank {
    font-family: var(--serif-en);
    font-style: italic;
    font-weight: 300;
    font-size: 13px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--ink-mute);
    margin-bottom: 8px;
  }
  .plan-name {
    font-family: var(--serif-ja);
    font-size: 30px;
    font-weight: 500;
    margin: 0 0 6px;
    letter-spacing: 0.01em;
  }
  .plan-kanji {
    font-family: var(--serif-ja);
    font-size: 13px;
    color: var(--ink-mute);
    margin-bottom: 32px;
  }
  .plan-price {
    font-family: var(--serif-en);
    font-weight: 300;
    line-height: 1;
    margin: 0 0 8px;
    display: flex;
    align-items: baseline;
    gap: 6px;
  }
  .plan-price .num {
    font-size: 84px;
    letter-spacing: -0.04em;
    font-variant-numeric: oldstyle-nums;
  }
  .plan-price .unit {
    font-family: var(--serif-ja);
    font-size: 18px;
    font-weight: 500;
    color: var(--ink-2);
  }
  .plan-price .tilde {
    font-family: var(--serif-ja);
    font-size: 22px;
    color: var(--ink-mute);
    margin-left: -2px;
  }
  .plan-tax {
    font-size: 11px;
    color: var(--ink-mute);
    letter-spacing: 0.1em;
    margin-bottom: 36px;
  }
  .plan-persona {
    font-size: 13px;
    color: var(--ink-2);
    padding: 14px 0;
    border-top: 1px solid var(--paper-line);
    border-bottom: 1px solid var(--paper-line);
    margin-bottom: 28px;
    font-feature-settings: "palt";
  }
  .plan-persona b {
    display: block;
    font-family: var(--serif-en);
    font-weight: 400;
    font-style: italic;
    font-size: 10px;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--ink-mute);
    margin-bottom: 6px;
  }
  .plan-capacity {
    font-family: var(--serif-ja);
    font-size: 15px;
    color: var(--ink);
    margin-bottom: 28px;
  }
  .plan-capacity strong {
    font-size: 22px;
    font-weight: 600;
    color: var(--accent);
    margin: 0 2px;
  }
  .plan ul {
    list-style: none;
    padding: 0;
    margin: 0 0 36px;
    flex-grow: 1;
    font-size: 14px;
    line-height: 1.9;
    color: var(--ink-2);
  }
  .plan ul li {
    padding: 9px 0 9px 22px;
    border-bottom: 1px dotted var(--paper-line);
    position: relative;
  }
  .plan ul li::before {
    content: "";
    position: absolute;
    left: 0; top: 18px;
    width: 10px; height: 1px;
    background: var(--ink-2);
  }
  .plan ul li.new {
    color: var(--ink);
  }
  .plan ul li.new::before {
    background: var(--accent);
    width: 14px;
    height: 2px;
    top: 17px;
  }
  .plan-cta {
    display: block;
    text-align: center;
    padding: 14px;
    font-size: 13px;
    letter-spacing: 0.1em;
    border: 1px solid var(--ink);
    color: var(--ink);
    transition: all 250ms;
  }
  .plan-cta:hover { background: var(--ink); color: var(--paper); }

  /* 中央プラン（竹）を強調 */
  .plan.featured {
    background: var(--ink);
    color: var(--paper);
    border-color: var(--ink);
    transform: translateY(-16px);
    box-shadow: 0 40px 80px -20px rgba(21,19,17,0.35);
    z-index: 2;
  }
  .plan.featured .plan-rank,
  .plan.featured .plan-kanji,
  .plan.featured .plan-tax,
  .plan.featured .plan-persona b { color: rgba(246,241,231,0.55); }
  .plan.featured .plan-persona { border-color: rgba(246,241,231,0.15); color: rgba(246,241,231,0.9); }
  .plan.featured .plan-price .unit { color: rgba(246,241,231,0.8); }
  .plan.featured .plan-price .tilde { color: rgba(246,241,231,0.5); }
  .plan.featured .plan-capacity { color: var(--paper); }
  .plan.featured .plan-capacity strong { color: #6FD3C0; }
  .plan.featured ul { color: rgba(246,241,231,0.85); }
  .plan.featured ul li { border-color: rgba(246,241,231,0.12); }
  .plan.featured ul li::before { background: rgba(246,241,231,0.7); }
  .plan.featured ul li.new { color: var(--paper); }
  .plan.featured ul li.new::before { background: #6FD3C0; }
  .plan.featured .plan-cta {
    background: var(--paper);
    color: var(--ink);
    border-color: var(--paper);
  }
  .plan.featured .plan-cta:hover {
    background: transparent;
    color: var(--paper);
    border-color: var(--paper);
  }
  .plan.featured .featured-flag {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--vermilion);
    color: #FAF5EC;
    font-family: var(--serif-ja);
    font-size: 12px;
    padding: 5px 18px;
    letter-spacing: 0.3em;
    white-space: nowrap;
  }

  .plans-note {
    margin-top: 32px;
    padding-top: 24px;
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 13px;
    color: var(--ink-mute);
    text-align: center;
  }

  /* ============ Maintenance comparison ============ */
  .maint-intro {
    display: grid;
    grid-template-columns: 0.85fr 1.15fr;
    gap: 72px;
    margin-bottom: 72px;
    align-items: center;
  }
  .maint-visual {
    aspect-ratio: 4/5;
    overflow: hidden;
    border-radius: 2px;
    box-shadow:
      0 1px 0 rgba(0,0,0,0.04),
      0 24px 48px -16px rgba(21,19,17,0.22),
      0 48px 96px -32px rgba(21,19,17,0.15);
  }
  .maint-visual img { width: 100%; height: 100%; object-fit: cover; }
  .maint-text { display: flex; flex-direction: column; gap: 36px; }
  .maint-quote {
    font-family: var(--serif-ja);
    font-size: 24px;
    line-height: 1.9;
    font-weight: 400;
    color: var(--ink);
    position: relative;
    padding-left: 40px;
  }
  .maint-quote::before {
    content: "「";
    position: absolute;
    left: -8px; top: -12px;
    font-size: 72px;
    color: var(--accent);
    font-family: var(--serif-ja);
    line-height: 1;
  }
  .maint-quote cite {
    display: block;
    font-style: normal;
    font-family: var(--serif-en);
    font-size: 12px;
    letter-spacing: 0.2em;
    color: var(--ink-mute);
    margin-top: 24px;
    text-transform: uppercase;
  }
  .maint-body p {
    font-size: 15px;
    line-height: 2.1;
    color: var(--ink-2);
    margin: 0 0 18px;
  }
  .maint-body p b {
    color: var(--accent);
    font-weight: 600;
  }

  .maint-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
  }
  .maint-table th, .maint-table td {
    padding: 22px 20px;
    text-align: left;
    border-bottom: 1px solid var(--paper-line);
    vertical-align: middle;
  }
  .maint-table thead th {
    font-family: var(--serif-ja);
    font-size: 16px;
    font-weight: 500;
    color: var(--ink);
    padding-bottom: 10px;
    border-bottom: 2px solid var(--ink);
  }
  .maint-table thead th small {
    display: block;
    font-family: var(--serif-en);
    font-style: italic;
    font-weight: 300;
    font-size: 11px;
    letter-spacing: 0.2em;
    color: var(--ink-mute);
    margin-top: 4px;
    text-transform: uppercase;
  }
  .maint-table thead th.hi {
    color: var(--accent);
    border-bottom-color: var(--accent);
  }
  .maint-table thead th.hi small { color: var(--accent); opacity: 0.7; }
  .maint-table .row-label {
    font-family: var(--serif-ja);
    color: var(--ink);
    font-weight: 500;
    width: 22%;
  }
  .maint-table td.hi {
    background: rgba(15,76,74,0.04);
    color: var(--ink);
    font-weight: 500;
  }
  .maint-table td .dash { color: var(--ink-mute); }
  .maint-table td .check {
    display: inline-block;
    width: 16px; height: 16px;
    color: var(--accent);
    font-family: var(--serif-en);
  }
  .maint-table tfoot td {
    font-family: var(--serif-ja);
    font-size: 20px;
    font-weight: 600;
    padding-top: 30px;
    border-bottom: none;
  }
  .maint-table tfoot td.hi { color: var(--accent); font-size: 22px; }
  .maint-table tfoot td small {
    display: block;
    font-size: 11px;
    font-weight: 400;
    color: var(--ink-mute);
    letter-spacing: 0.1em;
    margin-top: 2px;
    font-family: var(--sans-ja);
  }

  .cloud-compare {
    margin-top: 96px;
    padding: 48px 56px;
    background: var(--ink);
    color: var(--paper);
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 56px;
    align-items: center;
  }
  .cloud-compare h3 {
    font-family: var(--serif-ja);
    font-size: 26px;
    font-weight: 500;
    margin: 0 0 12px;
    line-height: 1.5;
  }
  .cloud-compare h3 small {
    display: block;
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 12px;
    letter-spacing: 0.2em;
    color: rgba(246,241,231,0.55);
    margin-bottom: 10px;
    text-transform: uppercase;
  }
  .cloud-grid {
    display: grid;
    grid-template-columns: 1fr 1fr auto;
    gap: 40px;
    align-items: end;
  }
  .cloud-item .label {
    font-size: 12px;
    letter-spacing: 0.15em;
    color: rgba(246,241,231,0.5);
    text-transform: uppercase;
    margin-bottom: 8px;
  }
  .cloud-item .val {
    font-family: var(--serif-en);
    font-weight: 300;
    font-size: 44px;
    line-height: 1;
    font-variant-numeric: oldstyle-nums;
  }
  .cloud-item .val .yen {
    font-family: var(--serif-ja);
    font-size: 22px;
    margin-left: 4px;
  }
  .cloud-item.ours .val { color: #6FD3C0; }
  .cloud-arrow {
    font-family: var(--serif-en);
    font-size: 48px;
    font-weight: 200;
    color: rgba(246,241,231,0.4);
  }

  /* ============ Pain points (S2) ============ */
  .pain-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    border-top: 1px solid var(--paper-line);
    border-left: 1px solid var(--paper-line);
  }
  .pain-card {
    padding: 32px 32px;
    border-right: 1px solid var(--paper-line);
    border-bottom: 1px solid var(--paper-line);
    position: relative;
    transition: background 300ms;
  }
  .pain-card:hover { background: var(--paper-deep); }
  .pain-card .vnum {
    font-family: var(--serif-en);
    font-style: italic;
    font-weight: 300;
    font-size: 11px;
    letter-spacing: 0.22em;
    color: var(--ink-mute);
    margin-bottom: 14px;
    text-transform: uppercase;
  }
  .pain-card p {
    font-family: var(--serif-ja);
    font-size: 15px;
    line-height: 1.8;
    color: var(--ink);
    margin: 0;
    font-weight: 400;
    position: relative;
    padding-left: 16px;
  }
  .pain-card p::before {
    content: "";
    position: absolute;
    left: 0; top: 10px; bottom: 10px;
    width: 2px;
    background: var(--vermilion);
  }

  /* ============ How it works (S3) ============ */
  .arch {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 80px;
    align-items: center;
  }
  .arch-diagram {
    position: relative;
    padding: 56px 40px;
    border: 1px solid var(--paper-line);
    background:
      linear-gradient(var(--paper-line) 1px, transparent 1px) 0 0 / 100% 48px,
      var(--paper);
    background-attachment: local;
  }
  .arch-ring {
    position: absolute;
    top: 14px; left: 14px; right: 14px;
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 10px;
    letter-spacing: 0.25em;
    color: var(--ink-mute);
    text-transform: uppercase;
    text-align: center;
    background: var(--paper);
    padding: 0 10px;
    width: fit-content;
    margin: 0 auto;
  }
  .arch-node {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 20px 24px;
    border: 1px solid var(--ink);
    background: var(--paper);
    font-family: var(--serif-ja);
    font-weight: 500;
    font-size: 15px;
  }
  .arch-node-main {
    background: var(--ink);
    color: var(--paper);
    border-color: var(--ink);
    padding: 28px 24px;
    margin: 0 auto 28px;
    max-width: 220px;
  }
  .arch-node-main .arch-node-label { font-size: 17px; font-weight: 600; letter-spacing: 0.04em; }
  .arch-node-main .arch-node-sub {
    font-family: var(--serif-en);
    font-style: italic;
    font-weight: 300;
    font-size: 11px;
    letter-spacing: 0.18em;
    color: rgba(246,241,231,0.55);
    margin-top: 6px;
    text-transform: uppercase;
  }
  .arch-wire {
    width: 1px;
    height: 32px;
    background: var(--ink);
    margin: 0 auto 28px;
    position: relative;
  }
  .arch-wire::before, .arch-wire::after {
    content: "";
    position: absolute;
    width: 6px; height: 6px;
    border: 1px solid var(--ink);
    background: var(--paper);
    border-radius: 50%;
    left: 50%;
    transform: translateX(-50%);
  }
  .arch-wire::before { top: -3px; }
  .arch-wire::after { bottom: -3px; }
  .arch-cluster {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }
  .arch-node-sub-item {
    padding: 18px 14px;
    font-size: 14px;
  }
  .arch-node-sub-item span {
    display: block;
    font-family: var(--serif-en);
    font-style: italic;
    font-weight: 300;
    font-size: 10px;
    letter-spacing: 0.15em;
    color: var(--ink-mute);
    margin-top: 6px;
    text-transform: uppercase;
  }
  .arch-body h3 {
    font-family: var(--serif-ja);
    font-size: 28px;
    font-weight: 500;
    margin: 0 0 24px;
    line-height: 1.55;
  }
  .arch-body p {
    font-size: 16px;
    line-height: 2;
    color: var(--ink-2);
    margin: 0 0 32px;
  }
  .how-points {
    list-style: none;
    padding: 0;
    margin: 0;
    border-top: 1px solid var(--paper-line);
  }
  .how-points li {
    padding: 18px 0 18px 36px;
    border-bottom: 1px solid var(--paper-line);
    position: relative;
    font-size: 15px;
    color: var(--ink);
  }
  .how-points li::before {
    content: "01";
    position: absolute;
    left: 0; top: 20px;
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 12px;
    letter-spacing: 0.15em;
    color: var(--accent);
    font-weight: 400;
  }
  .how-points li:nth-child(2)::before { content: "02"; }
  .how-points li:nth-child(3)::before { content: "03"; }

  /* ============ Comparison (S4) ============ */
  .cmp-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 15px;
  }
  .cmp-table th, .cmp-table td {
    padding: 22px 20px;
    text-align: left;
    border-bottom: 1px solid var(--paper-line);
    vertical-align: top;
  }
  .cmp-table thead th {
    font-family: var(--serif-ja);
    font-size: 17px;
    font-weight: 500;
    padding-bottom: 14px;
    border-bottom: 2px solid var(--ink);
  }
  .cmp-table thead th small {
    display: block;
    font-family: var(--serif-en);
    font-style: italic;
    font-weight: 300;
    font-size: 11px;
    letter-spacing: 0.2em;
    color: var(--ink-mute);
    margin-top: 4px;
    text-transform: uppercase;
  }
  .cmp-table thead th.hi { color: var(--accent); border-bottom-color: var(--accent); }
  .cmp-table thead th.hi small { color: var(--accent); opacity: 0.7; }
  .cmp-table .row-label {
    font-family: var(--serif-ja);
    color: var(--ink);
    font-weight: 500;
    width: 22%;
  }
  .cmp-table td.hi {
    background: rgba(15,76,74,0.04);
    color: var(--ink);
    font-weight: 500;
  }
  .cmp-table td.dim {
    color: var(--ink-mute);
  }

  /* ============ Strengths (S5) ============ */
  .strengths-head {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    margin-bottom: 96px;
  }
  .strengths-visual {
    aspect-ratio: 4/5;
    overflow: hidden;
    box-shadow: 0 40px 80px -24px rgba(21,19,17,0.3);
  }
  .strengths-visual img { width: 100%; height: 100%; object-fit: cover; }
  .strengths-lede {
    font-family: var(--serif-ja);
    font-size: 24px;
    line-height: 1.9;
    color: var(--ink);
  }
  .strengths-lede small {
    display: block;
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 12px;
    letter-spacing: 0.25em;
    color: var(--ink-mute);
    text-transform: uppercase;
    margin-bottom: 20px;
  }

  .strengths-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    border-top: 1px solid var(--ink);
  }
  .str-item {
    padding: 40px 40px 8px 0;
    border-right: 1px solid var(--paper-line);
  }
  .str-item:last-child { border-right: none; padding-right: 0; }
  .str-item:not(:first-child) { padding-left: 40px; }
  .str-item .rn {
    font-family: var(--serif-en);
    font-weight: 300;
    font-size: 64px;
    line-height: 1;
    color: var(--vermilion);
    font-style: italic;
    margin-bottom: 18px;
    letter-spacing: -0.02em;
  }
  .str-item h3 {
    font-family: var(--serif-ja);
    font-size: 20px;
    font-weight: 600;
    line-height: 1.6;
    margin: 0 0 16px;
    color: var(--ink);
  }
  .str-item p {
    font-size: 14px;
    line-height: 2;
    color: var(--ink-2);
    margin: 0;
  }

  /* ============ Use cases (S6) ============ */
  .uc-tabs {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--paper-line);
    margin-bottom: 48px;
    flex-wrap: wrap;
  }
  .uc-tab {
    font-family: var(--serif-ja);
    font-size: 17px;
    font-weight: 500;
    background: none;
    border: none;
    padding: 18px 28px;
    cursor: pointer;
    color: var(--ink-mute);
    position: relative;
    transition: color 200ms;
    letter-spacing: 0.02em;
  }
  .uc-tab:hover { color: var(--ink); }
  .uc-tab[aria-selected="true"] {
    color: var(--ink);
  }
  .uc-tab[aria-selected="true"]::after {
    content: "";
    position: absolute;
    left: 0; right: 0; bottom: -1px;
    height: 2px;
    background: var(--vermilion);
  }
  .uc-panel { display: none; }
  .uc-panel.is-active { display: block; }
  .uc-panel {
    display: none;
    grid-template-columns: auto 1fr;
    gap: 48px;
  }
  .uc-panel.is-active { display: grid; }
  .uc-panel-label {
    font-family: var(--serif-en);
    font-style: italic;
    font-weight: 300;
    font-size: 13px;
    letter-spacing: 0.2em;
    color: var(--ink-mute);
    text-transform: uppercase;
    padding-top: 8px;
    border-right: 1px solid var(--paper-line);
    padding-right: 48px;
    min-width: 140px;
  }
  .uc-list {
    list-style: none;
    padding: 0;
    margin: 0;
    font-family: var(--serif-ja);
    font-size: 18px;
    line-height: 2.2;
    color: var(--ink);
  }
  .uc-list li {
    position: relative;
    padding-left: 28px;
  }
  .uc-list li::before {
    content: "—";
    position: absolute;
    left: 0;
    color: var(--accent);
  }
  .uc-panel a.btn-ghost { margin-top: 16px; }

  /* ============ Flow (S8) ============ */
  .flow {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0 0;
    position: relative;
  }
  .flow-step {
    display: contents;
  }
  .flow-num {
    font-family: var(--serif-en);
    font-weight: 300;
    font-style: italic;
    font-size: 56px;
    line-height: 1;
    color: var(--ink);
    padding: 36px 48px 36px 0;
    border-bottom: 1px solid var(--paper-line);
    border-right: 1px solid var(--paper-line);
    text-align: right;
    font-variant-numeric: oldstyle-nums;
    min-width: 140px;
  }
  .flow-body {
    padding: 40px 0 40px 48px;
    border-bottom: 1px solid var(--paper-line);
  }
  .flow-step:last-child .flow-num,
  .flow-step:last-child .flow-body {
    border-bottom: none;
  }
  .flow-body h4 {
    font-family: var(--serif-ja);
    font-size: 21px;
    font-weight: 600;
    margin: 0 0 8px;
    color: var(--ink);
  }
  .flow-body .dur {
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 12px;
    letter-spacing: 0.15em;
    color: var(--accent);
    text-transform: uppercase;
    margin-bottom: 12px;
    display: inline-block;
  }
  .flow-body p {
    font-size: 14px;
    color: var(--ink-2);
    margin: 0;
    line-height: 1.9;
  }
  .flow-notes {
    margin-top: 40px;
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 13px;
    color: var(--ink-mute);
  }
  .flow-notes p { margin: 0 0 4px; }

  /* ============ Founder (S9) ============ */
  .founder {
    display: grid;
    grid-template-columns: 0.42fr 1fr;
    gap: 72px;
    align-items: center;
  }
  .founder-card {
    aspect-ratio: 3/4;
    max-width: 320px;
    background: linear-gradient(135deg, #E8E0CC 0%, #C9BFA8 100%);
    position: relative;
    overflow: hidden;
    box-shadow: 0 30px 60px -20px rgba(21,19,17,0.25);
    display: block;
    cursor: pointer;
    transition: transform 400ms cubic-bezier(.2,.7,.2,1), box-shadow 400ms;
  }
  .founder-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 40px 80px -24px rgba(21,19,17,0.35);
  }
  .founder-hover {
    position: absolute;
    left: 0; right: 0; bottom: 0;
    padding: 16px 24px;
    background: linear-gradient(to top, rgba(21,19,17,0.9), rgba(21,19,17,0));
    color: var(--paper);
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 13px;
    letter-spacing: 0.12em;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 300ms, transform 300ms;
  }
  .founder-card:hover .founder-hover {
    opacity: 1;
    transform: translateY(0);
  }
  .founder-card .founder-photo {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center 20%;
    filter: saturate(0.9) contrast(1.02);
  }
  .founder-card .tag {
    position: absolute;
    left: 24px; bottom: 24px;
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 11px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--paper);
    background: rgba(21,19,17,0.6);
    padding: 6px 12px;
    backdrop-filter: blur(4px);
  }
  .founder-info h3 {
    font-family: var(--serif-ja);
    font-size: 28px;
    font-weight: 600;
    margin: 0 0 6px;
  }
  .founder-info .title {
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 13px;
    color: var(--ink-mute);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    margin-bottom: 28px;
  }
  .founder-info ul {
    list-style: none;
    padding: 0;
    margin: 0 0 36px;
    border-top: 1px solid var(--paper-line);
  }
  .founder-info ul li {
    padding: 14px 0;
    border-bottom: 1px solid var(--paper-line);
    font-size: 14px;
    color: var(--ink-2);
  }
  .founder-quote {
    font-family: var(--serif-ja);
    font-size: 18px;
    line-height: 2;
    color: var(--ink);
    border-left: 2px solid var(--vermilion);
    padding: 6px 0 6px 20px;
    margin: 0 0 28px;
    font-weight: 400;
  }
  .founder-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 13px;
    letter-spacing: 0.12em;
    color: var(--accent);
    border-bottom: 1px solid var(--paper-line);
    padding: 10px 0 12px;
    transition: all 250ms;
  }
  .founder-link:hover {
    color: var(--ink);
    border-bottom-color: var(--ink);
  }
  .founder-link span { transition: transform 250ms; }
  .founder-link:hover span { transform: translateX(4px); }

  /* ============ FAQ (S10) ============ */
  .faq-list {
    border-top: 1px solid var(--ink);
  }
  .faq-list details {
    border-bottom: 1px solid var(--paper-line);
    padding: 24px 0;
  }
  .faq-list summary {
    font-family: var(--serif-ja);
    font-size: 18px;
    font-weight: 500;
    color: var(--ink);
    cursor: pointer;
    list-style: none;
    position: relative;
    padding-right: 48px;
    padding-left: 44px;
  }
  .faq-list summary::-webkit-details-marker { display: none; }
  .faq-list summary::before {
    content: "Q";
    position: absolute;
    left: 0; top: 0;
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 18px;
    color: var(--vermilion);
    font-weight: 400;
  }
  .faq-list summary::after {
    content: "＋";
    position: absolute;
    right: 0; top: 0;
    color: var(--ink-mute);
    font-weight: 300;
    font-size: 20px;
    transition: transform 250ms;
  }
  .faq-list details[open] summary::after {
    content: "−";
  }
  .faq-list details .ans {
    padding: 18px 0 6px 44px;
    font-size: 15px;
    color: var(--ink-2);
    line-height: 2;
    position: relative;
  }
  .faq-list details .ans::before {
    content: "A";
    position: absolute;
    left: 0; top: 18px;
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 18px;
    color: var(--accent);
  }

  /* ============ Download (S11) ============ */
  .dl-wrap {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
  }
  .dl-cover {
    aspect-ratio: 3/4;
    background: var(--ink);
    color: var(--paper);
    padding: 48px 44px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
    box-shadow: 0 40px 80px -24px rgba(21,19,17,0.3);
  }
  .dl-cover::before {
    content: "";
    position: absolute;
    inset: 14px;
    border: 1px solid rgba(246,241,231,0.2);
    pointer-events: none;
  }
  .dl-cover .edition {
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 12px;
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: rgba(246,241,231,0.6);
    position: relative;
  }
  .dl-cover h3 {
    font-family: var(--serif-ja);
    font-size: 34px;
    font-weight: 500;
    line-height: 1.5;
    margin: 0;
    position: relative;
  }
  .dl-cover h3 small {
    display: block;
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 13px;
    letter-spacing: 0.1em;
    color: rgba(246,241,231,0.5);
    margin-top: 18px;
    font-weight: 300;
    text-transform: none;
  }
  .dl-cover .pages {
    position: relative;
    font-family: var(--serif-en);
    font-size: 11px;
    letter-spacing: 0.2em;
    color: rgba(246,241,231,0.4);
    text-transform: uppercase;
  }

  .dl-form h3 {
    font-family: var(--serif-ja);
    font-size: 24px;
    font-weight: 500;
    margin: 0 0 12px;
  }
  .dl-form > p {
    font-size: 15px;
    color: var(--ink-2);
    margin: 0 0 32px;
    line-height: 1.9;
  }
  .fg { margin-bottom: 20px; }
  .fg label {
    display: block;
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 11px;
    letter-spacing: 0.2em;
    color: var(--ink-mute);
    text-transform: uppercase;
    margin-bottom: 8px;
  }
  .fg label .req { color: var(--vermilion); margin-left: 4px; }
  .fg input {
    width: 100%;
    padding: 14px 4px;
    font-family: var(--sans-ja);
    font-size: 15px;
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--paper-line);
    color: var(--ink);
    outline: none;
    transition: border-color 200ms;
  }
  .fg input:focus { border-bottom-color: var(--ink); }
  .dl-form button {
    width: 100%;
    margin-top: 12px;
    padding: 18px;
    font-family: var(--sans-ja);
    font-weight: 500;
    font-size: 14px;
    letter-spacing: 0.1em;
    background: var(--ink);
    color: var(--paper);
    border: none;
    cursor: pointer;
    transition: background 250ms;
  }
  .dl-form button:hover { background: var(--accent); }

  /* ============ Final CTA (S12) ============ */
  .cta-final {
    padding: 160px 0;
    background: var(--ink);
    color: var(--paper);
    text-align: center;
    position: relative;
    overflow: hidden;
  }
  .cta-final::before {
    content: "";
    position: absolute;
    top: 40px; left: 50%;
    transform: translateX(-50%);
    width: 60px; height: 1px;
    background: var(--vermilion);
  }
  .cta-final .stamp {
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 12px;
    letter-spacing: 0.3em;
    color: rgba(246,241,231,0.5);
    text-transform: uppercase;
    margin-bottom: 32px;
  }
  .cta-final h2 {
    font-family: var(--serif-ja);
    font-size: clamp(36px, 4.5vw, 60px);
    font-weight: 500;
    line-height: 1.55;
    margin: 0 0 28px;
    letter-spacing: -0.005em;
  }
  .cta-final .sub {
    font-size: 16px;
    color: rgba(246,241,231,0.75);
    max-width: 32em;
    margin: 0 auto 48px;
    line-height: 2;
  }
  .cta-final .btn-row {
    display: flex;
    gap: 18px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 32px;
  }
  .cta-final .btn-fill {
    background: var(--paper);
    color: var(--ink);
    padding: 18px 36px;
    font-family: var(--sans-ja);
    font-weight: 500;
    font-size: 14px;
    letter-spacing: 0.1em;
    display: inline-flex;
    align-items: center;
    gap: 12px;
    transition: all 300ms;
  }
  .cta-final .btn-fill:hover { background: var(--vermilion); color: var(--paper); }
  .cta-final .btn-fill::after { content: "→"; font-family: var(--serif-en); }
  .cta-final .btn-line {
    color: var(--paper);
    border: 1px solid rgba(246,241,231,0.3);
    padding: 18px 36px;
    font-family: var(--sans-ja);
    font-weight: 400;
    font-size: 14px;
    letter-spacing: 0.1em;
    transition: all 300ms;
  }
  .cta-final .btn-line:hover { border-color: var(--paper); }
  .cta-final .note {
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 13px;
    color: rgba(246,241,231,0.5);
  }

  /* ============ Footer ============ */
  .foot {
    background: #0A0907;
    color: rgba(246,241,231,0.7);
    padding: 56px 0 36px;
    font-size: 13px;
  }
  .foot-grid {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 32px;
    align-items: center;
    padding-bottom: 28px;
    border-bottom: 1px solid rgba(246,241,231,0.1);
    margin-bottom: 28px;
  }
  .foot-brand {
    font-family: var(--serif-en);
    font-size: 14px;
    letter-spacing: 0.28em;
    color: var(--paper);
  }
  .foot-links { display: flex; gap: 28px; }
  .foot-links a { color: rgba(246,241,231,0.7); transition: color 200ms; }
  .foot-links a:hover { color: var(--paper); }
  .foot-copy {
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 11px;
    color: rgba(246,241,231,0.4);
    letter-spacing: 0.1em;
  }

  /* ============ Responsive ============ */
  @media (max-width: 960px) {
    .hero { padding: 48px 0 80px; }
    .hero-grid { grid-template-columns: 1fr; gap: 48px; }
    .hero-visual { aspect-ratio: 4/3; }
    .hero-caption { right: 16px; bottom: -20px; max-width: 220px; }
    .sec-head { grid-template-columns: 1fr; gap: 20px; }
    .sec-num { font-size: 64px; }
    .section { padding: 80px 0; }
    .plans { grid-template-columns: 1fr; }
    .plan + .plan { border-left: 1px solid var(--paper-line); border-top: none; }
    .plan.featured { transform: none; }
    .maint-intro { grid-template-columns: 1fr; gap: 40px; }
    .maint-visual { aspect-ratio: 4/3; max-height: 380px; }
    .maint-table { font-size: 12px; }
    .maint-table th, .maint-table td { padding: 14px 10px; }
    .cloud-compare { grid-template-columns: 1fr; padding: 36px 28px; gap: 32px; }
    .cloud-grid { grid-template-columns: 1fr 1fr; }
    .cloud-arrow { display: none; }

    .pain-grid { grid-template-columns: 1fr; }
    .arch { grid-template-columns: 1fr; gap: 40px; }
    .arch-diagram { padding: 40px 24px; }
    .cmp-table { font-size: 13px; }
    .cmp-table th, .cmp-table td { padding: 14px 10px; }
    .strengths-head { grid-template-columns: 1fr; gap: 40px; }
    .strengths-visual { aspect-ratio: 4/3; max-height: 420px; }
    .strengths-list { grid-template-columns: 1fr; }
    .str-item { border-right: none; border-bottom: 1px solid var(--paper-line); padding: 40px 0 28px 0 !important; }
    .str-item:last-child { border-bottom: none; }
    .uc-panel.is-active { grid-template-columns: 1fr; gap: 24px; }
    .uc-panel-label { border-right: none; border-bottom: 1px solid var(--paper-line); padding: 0 0 16px; }
    .flow-num { font-size: 40px; padding: 24px 24px 24px 0; min-width: 90px; }
    .flow-body { padding: 24px 0 24px 24px; }
    .founder { grid-template-columns: 1fr; gap: 48px; }
    .dl-wrap { grid-template-columns: 1fr; gap: 48px; }
    .dl-cover { aspect-ratio: 4/3; max-height: 360px; padding: 32px 28px; }
    .dl-cover h3 { font-size: 26px; }
    .cta-final { padding: 96px 0; }
    .foot-grid { grid-template-columns: 1fr; text-align: center; }
    .foot-links { justify-content: center; flex-wrap: wrap; }
  }

  /* Preview banner */
  .pv-banner {
    position: fixed;
    bottom: 16px;
    left: 16px;
    z-index: 100;
    background: var(--vermilion);
    color: var(--paper);
    padding: 10px 16px;
    font-family: var(--serif-en);
    font-style: italic;
    font-size: 12px;
    letter-spacing: 0.1em;
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
  }