/* IIM 紹介用LP。システム本体の配色（紺＋赤のロゴ、白地）に合わせる */

:root {
  --ink: #1f2933;
  --ink-2: #52606d;
  --ink-3: #7b8794;
  --line: #dbe1e8;
  --line-soft: #eef2f6;
  --surface: #ffffff;
  --surface-2: #f6f8fa;
  --accent: #1f4e79;
  --accent-soft: #eaf1f8;
  --accent-line: #c5d8e9;
  --brand: #d7262c;
  --radius: 12px;
  --width: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--surface);
  color: var(--ink);
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic UI", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.9;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

h1,
h2,
h3 {
  line-height: 1.5;
  letter-spacing: 0.01em;
}

/* 上部のバー */
.bar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 20px;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line-soft);
  backdrop-filter: blur(6px);
}

.bar-logo {
  width: 72px;
  height: auto;
}

.bar-cta {
  margin-left: auto;
  padding: 8px 16px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.bar-cta:hover {
  background: #17395a;
}

/* 見出し部分 */
.hero {
  max-width: var(--width);
  margin: 0 auto;
  padding: 56px 20px 24px;
  text-align: center;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.hero h1 {
  margin: 0 0 20px;
  font-size: clamp(26px, 4.4vw, 42px);
  font-weight: 800;
}

.lead {
  max-width: 760px;
  margin: 0 auto;
  color: var(--ink-2);
  font-size: 15.5px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin: 28px 0 8px;
}

.button {
  display: inline-block;
  padding: 13px 26px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}

.button:hover {
  background: var(--surface-2);
}

.button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.button.primary:hover {
  background: #17395a;
}

.hero-shot {
  margin: 36px 0 0;
}

.hero-shot img {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 10px 30px rgba(31, 41, 51, 0.1);
}

/* 各節 */
.section {
  max-width: var(--width);
  margin: 0 auto;
  padding: 56px 20px;
}

.section.alt {
  max-width: none;
  background: var(--surface-2);
  border-block: 1px solid var(--line-soft);
}

.section.alt > * {
  max-width: var(--width);
  margin-inline: auto;
}

.section h2 {
  margin: 0 0 12px;
  font-size: clamp(20px, 2.6vw, 27px);
  font-weight: 800;
}

.section-lead {
  margin: 0 0 28px;
  color: var(--ink-2);
  font-size: 15px;
}

/* 3つ並ぶカード */
.cards {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.cards.three {
  grid-template-columns: repeat(3, 1fr);
}

.card {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  color: var(--accent);
}

.card p {
  margin: 0;
  color: var(--ink-2);
  font-size: 14px;
}

/* 4段階の流れ */
.flow {
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
  grid-template-columns: repeat(4, 1fr);
}

.flow li {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.flow .step {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
}

.flow h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.flow p {
  margin: 0;
  color: var(--ink-2);
  font-size: 14px;
}

/* 機能の紹介（文章＋画面写真） */
.feature {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 36px;
  align-items: center;
  padding: 28px 0;
}

.feature.reverse .feature-text {
  order: 2;
}

.feature h3 {
  margin: 0 0 10px;
  font-size: 20px;
}

.feature p {
  margin: 0 0 14px;
  color: var(--ink-2);
  font-size: 15px;
}

.feature ul {
  margin: 0;
  padding-left: 20px;
  color: var(--ink-2);
  font-size: 14px;
}

.feature li {
  margin-bottom: 4px;
}

.feature figure {
  margin: 0;
}

.feature figure img {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 6px 20px rgba(31, 41, 51, 0.08);
}

.feature figure.narrow img {
  max-width: min(420px, 100%);
  margin-inline: auto;
}

/* よくあるご質問 */
.faq {
  display: grid;
  gap: 10px;
}

.faq details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.faq summary {
  padding: 16px 18px;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::before {
  content: "＋";
  margin-right: 10px;
  color: var(--accent);
  font-family: monospace;
}

.faq details[open] summary::before {
  content: "−";
}

.faq p {
  margin: 0;
  padding: 0 18px 18px 42px;
  color: var(--ink-2);
  font-size: 14.5px;
}

/* お問い合わせ */
.contact {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-2);
}

.contact label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13.5px;
  font-weight: 700;
}

.contact label.wide,
.contact .submit,
.contact .hp {
  grid-column: 1 / -1;
}

.contact em {
  margin-left: 8px;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--brand);
  color: #fff;
  font-size: 10.5px;
  font-style: normal;
}

.contact input,
.contact textarea {
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-size: 15px;
}

.contact textarea {
  resize: vertical;
}

.contact .submit {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.contact .note {
  margin: 0;
  color: var(--ink-3);
  font-size: 12.5px;
  font-weight: 400;
}

.contact .note.ok {
  color: #2f855a;
  font-weight: 700;
}

.contact .note.bad {
  color: var(--brand);
  font-weight: 700;
}

/* 自動投稿よけ。人には見せない */
.hp {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.foot {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 28px 20px 40px;
  border-top: 1px solid var(--line-soft);
  color: var(--ink-3);
  font-size: 13px;
}

.foot img {
  width: 56px;
}

.foot p {
  margin: 0;
}

@media (max-width: 860px) {
  .cards.three,
  .flow {
    grid-template-columns: 1fr;
  }

  .feature {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .feature.reverse .feature-text {
    order: 0;
  }

  .contact {
    grid-template-columns: 1fr;
  }
}