/*
Theme Name: IDEA Original
Theme URI: https://idea-ep.com/
Author: IDEA ENTERPRISE
Description: 株式会社イデアエンタープライズ専用の1ページ企業サイトテーマです。Sydney・Elementorに依存せず、トップページを固定コードで構築しています。
Version: 1.1.0
Requires at least: 6.0
Requires PHP: 7.4
Text Domain: idea-original
*/

:root {
  --idea-blue: #00558f;
  --idea-blue-dark: #003d6d;
  --idea-cyan: #00a5b5;
  --idea-pale: #eef6fb;
  --idea-text: #243746;
  --idea-muted: #637381;
  --idea-line: #dce6ed;
  --idea-white: #fff;
  --idea-shadow: 0 12px 32px rgba(22, 71, 102, .10);
  --idea-radius: 14px;
  --idea-width: 1120px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--idea-text);
  background: #fff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
body.menu-open { overflow: hidden; }
img { display: block; max-width: 100%; height: auto; }
a { color: var(--idea-cyan); text-decoration: none; transition: opacity .2s ease, color .2s ease, transform .2s ease; }
a:hover { color: var(--idea-blue); }
button, input, textarea, select { font: inherit; }

.screen-reader-text {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}
.screen-reader-text:focus {
  position: fixed !important;
  top: 12px; left: 12px; z-index: 99999;
  width: auto; height: auto; padding: 12px 16px; margin: 0;
  clip: auto; background: #fff; color: #000;
}

.idea-container { width: min(calc(100% - 40px), var(--idea-width)); margin-inline: auto; }
.idea-section { padding: 92px 0; }
.idea-section--soft { background: #f7fafc; }
.idea-section-heading { margin: 0 0 44px; text-align: center; }
.idea-section-heading__en {
  display: block; color: var(--idea-blue); font-size: clamp(1.7rem, 3vw, 2.45rem);
  font-weight: 800; letter-spacing: .08em; line-height: 1.25;
}
.idea-section-heading__ja {
  display: block; margin-top: 8px; color: var(--idea-muted);
  font-size: .8rem; font-weight: 700; letter-spacing: .16em;
}
.idea-kicker { color: var(--idea-cyan); font-size: .79rem; font-weight: 800; letter-spacing: .17em; }

/* Header */
.idea-header {
  position: fixed; inset: 0 0 auto; z-index: 1000;
  height: 76px; background: rgba(255,255,255,.94);
  border-bottom: 1px solid rgba(0,85,143,.09);
  backdrop-filter: blur(12px);
}
.idea-header__inner {
  width: min(calc(100% - 40px), 1280px); height: 100%; margin: auto;
  display: flex; align-items: center; justify-content: space-between; gap: 30px;
}
.idea-logo img { width: 172px; }
.idea-nav ul { display: flex; align-items: center; gap: 25px; margin: 0; padding: 0; list-style: none; }
.idea-nav a {
  color: var(--idea-blue-dark); font-size: .75rem; font-weight: 800;
  letter-spacing: .08em; text-transform: uppercase;
}
.idea-nav a:hover { color: var(--idea-cyan); }
.idea-menu-button {
  display: none; width: 46px; height: 46px; padding: 10px; border: 0;
  border-radius: 8px; background: var(--idea-blue); cursor: pointer;
}
.idea-menu-button span { display: block; width: 100%; height: 2px; margin: 5px 0; background: #fff; transition: .25s; }
.idea-menu-button[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.idea-menu-button[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.idea-menu-button[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Hero */
.idea-hero {
  min-height: 610px; padding-top: 76px;
  display: grid; place-items: center;
  background: linear-gradient(90deg, rgba(255,255,255,.03), rgba(255,255,255,.18)), url('img/img-header.jpg') center 45% / cover no-repeat;
}
.idea-hero__inner { width: min(calc(100% - 40px), 960px); }
.idea-hero__content { max-width: 680px; margin-left: 17%; text-shadow: 0 1px 12px rgba(255,255,255,.85); }
.idea-hero h1 {
  margin: 0 0 18px; color: #fff; font-size: clamp(2rem, 4.6vw, 4.2rem);
  line-height: 1.35; letter-spacing: .04em; text-shadow: 0 3px 16px rgba(0,71,125,.28);
}
.idea-hero h1 span { color: #fff; }
.idea-hero p {
  margin: 0; color: var(--idea-blue-dark); font-size: clamp(.96rem, 1.6vw, 1.18rem);
  font-weight: 700; line-height: 2;
}

/* Services */
.idea-services-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 26px; }
.idea-service-card {
  position: relative; min-height: 230px; padding: 34px 34px 30px 112px;
  background: #fff; border: 1px solid #edf2f5; border-radius: var(--idea-radius);
  box-shadow: var(--idea-shadow);
}
.idea-service-card:hover { transform: translateY(-4px); }
.idea-service-card__icon {
  position: absolute; top: 34px; left: 32px; width: 58px; height: 58px;
  display: grid; place-items: center; color: var(--idea-blue);
  background: #dcebf5; border-radius: 50%;
}
.idea-service-card__icon svg { width: 29px; height: 29px; fill: currentColor; }
.idea-service-card h3 { margin: 0 0 13px; font-size: 1.03rem; line-height: 1.55; }
.idea-service-card h3 a { color: var(--idea-cyan); text-decoration: underline; text-underline-offset: 3px; }
.idea-service-card p { margin: 0; color: #596976; font-size: .88rem; line-height: 1.75; }
.idea-service-card--last { grid-column: 1 / 2; }

/* Welfare */
.idea-welfare-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.idea-welfare-card { text-align: center; }
.idea-welfare-card a { display: block; color: var(--idea-cyan); font-weight: 800; }
.idea-welfare-card img {
  width: 100%; aspect-ratio: 4 / 3; object-fit: cover;
  border-radius: var(--idea-radius); box-shadow: var(--idea-shadow);
  transition: transform .25s ease, opacity .25s ease;
}
.idea-welfare-card a:hover img { transform: translateY(-4px); opacity: .9; }
.idea-welfare-card__type { display: block; margin-top: 14px; font-size: .74rem; }
.idea-welfare-card__name { display: block; font-size: .84rem; line-height: 1.5; }
.idea-welfare-card:nth-child(4), .idea-welfare-card:nth-child(5) { transform: translateX(52%); }

/* Banners */
.idea-banner-block { padding: 60px 0; }
.idea-banner-title { margin: 0 0 18px; color: #ed6d20; text-align: center; font-size: 1rem; }
.idea-banner-note { margin: 0 0 24px; text-align: center; font-size: .82rem; color: var(--idea-muted); }
.idea-banners { display: grid; grid-template-columns: 1.12fr .88fr; gap: 24px; align-items: center; }
.idea-banners a { display: block; overflow: hidden; border-radius: 12px; box-shadow: var(--idea-shadow); }
.idea-banners a:hover { opacity: .88; transform: translateY(-3px); }
.idea-banners img { width: 100%; }
.idea-recruit { margin-top: 50px; padding-top: 10px; text-align: center; }
.idea-recruit a { display: inline-block; max-width: 805px; }

/* Message */
.idea-message { max-width: 970px; margin: auto; }
.idea-message p { margin: 0 0 18px; color: #53626d; font-size: .94rem; }
.idea-message__signature { margin-top: 34px !important; text-align: right; color: var(--idea-text) !important; }

/* Corporate */
.idea-corporate-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 64px;
  align-items: start;
}
.idea-corporate-list { margin: 0; }
.idea-corporate-row { display: grid; grid-template-columns: 135px 1fr; border-bottom: 1px solid var(--idea-line); }
.idea-corporate-row dt { padding: 17px 18px; color: #698ca5; background: #f3f6f8; font-weight: 700; }
.idea-corporate-row dd { margin: 0; padding: 17px 19px; font-size: .91rem; }
.idea-corporate-row a { text-decoration: underline; }

/* Contact */
.idea-contact-intro { max-width: 760px; margin: -16px auto 36px; text-align: center; color: #687783; font-size: .88rem; }
.idea-contact-form { max-width: 900px; margin: auto; }
.idea-contact-form .wpcf7 { width: 100%; }
.idea-contact-form form { margin: 0; }
.idea-contact-form dl { margin: 0; }
.idea-contact-form dt, .idea-contact-form dd { margin: 0; padding: 18px 22px; border-bottom: 1px solid var(--idea-line); }
.idea-contact-form dt { color: #6f93ad; background: #f3f6f8; font-weight: 700; }
.idea-contact-form dd { background: #fff; }
.idea-contact-form form > p { text-align: center; }
.idea-contact-form .hissu, .idea-contact-form .required { color: #ef6c1a; font-weight: 700; }
.idea-contact-form input[type="text"],
.idea-contact-form input[type="email"],
.idea-contact-form input[type="tel"],
.idea-contact-form input[type="url"],
.idea-contact-form select,
.idea-contact-form textarea {
  width: 100%; max-width: 100%; padding: 11px 13px;
  border: 1px solid #cad6de; border-radius: 5px; background: #fff;
}
.idea-contact-form textarea { min-height: 170px; resize: vertical; }
.idea-contact-form input[type="submit"] {
  min-width: 160px; padding: 13px 32px; color: #fff; background: var(--idea-blue);
  border: 0; border-radius: 4px; font-weight: 800; cursor: pointer;
}
.idea-contact-form input[type="submit"]:hover { background: var(--idea-cyan); }
.idea-contact-form .wpcf7-list-item { margin: 0 1em .5em 0; }

/* Generic pages */
.idea-page-main { min-height: 60vh; padding: 130px 0 90px; }
.idea-page-content { max-width: 900px; margin: auto; }
.idea-page-content h1 { color: var(--idea-blue); font-size: clamp(1.8rem, 4vw, 2.7rem); }
.idea-page-content h2 { margin-top: 2.2em; color: var(--idea-blue); }
.idea-page-content a { text-decoration: underline; }

/* Footer */
.idea-footer { padding: 70px 0 30px; background: #f7fafc; border-top: 1px solid #edf2f5; }
.idea-footer__grid { display: grid; grid-template-columns: 1.05fr 1.2fr 1fr; gap: 58px; }
.idea-footer__logo img { width: 190px; margin-bottom: 22px; }
.idea-footer h3 { margin: 0 0 16px; color: var(--idea-blue); font-size: .92rem; letter-spacing: .06em; }
.idea-footer p, .idea-footer li { color: #5d6b75; font-size: .82rem; line-height: 1.8; }
.idea-footer ul { margin: 0; padding: 0; list-style: none; }
.idea-footer a { color: #36718f; text-decoration: underline; }
.idea-footer__links { margin-top: 24px; }
.idea-social { display: flex; gap: 8px; margin-top: 14px; }
.idea-social a { width: 31px; height: 31px; }
.idea-social img { width: 31px; height: 31px; }
.idea-copyright { margin: 45px 0 0; padding-top: 24px; text-align: center; border-top: 1px solid var(--idea-line); color: #80909a; font-size: .75rem; }
.idea-go-top {
  position: fixed; right: 18px; bottom: 18px; z-index: 900;
  width: 46px; height: 46px; display: grid; place-items: center;
  color: #fff; background: var(--idea-blue); border-radius: 8px;
  opacity: 0; pointer-events: none; transform: translateY(8px);
}
.idea-go-top.is-visible { opacity: 1; pointer-events: auto; transform: translateY(0); }

@media (max-width: 900px) {
  .idea-nav {
    position: fixed; top: 76px; right: 0; bottom: 0; width: min(82vw, 360px);
    padding: 24px; background: var(--idea-blue-dark);
    transform: translateX(102%); transition: transform .25s ease;
  }
  .idea-nav.is-open { transform: translateX(0); }
  .idea-nav ul { display: block; }
  .idea-nav li { border-bottom: 1px solid rgba(255,255,255,.18); }
  .idea-nav a { display: block; padding: 17px 8px; color: #fff; font-size: .9rem; }
  .idea-menu-button { display: block; }
  .idea-hero__content { margin-left: 7%; }
  .idea-welfare-grid { grid-template-columns: repeat(2,1fr); }
  .idea-welfare-card:nth-child(4), .idea-welfare-card:nth-child(5) { transform: none; }
  .idea-banners, .idea-corporate-grid, .idea-footer__grid { grid-template-columns: 1fr; }
  .idea-footer__grid { gap: 36px; }
}

@media (max-width: 680px) {
  .idea-container { width: min(calc(100% - 28px), var(--idea-width)); }
  .idea-section { padding: 68px 0; }
  .idea-header { height: 66px; }
  .idea-header__inner { width: calc(100% - 24px); }
  .idea-logo img { width: 145px; }
  .idea-nav { top: 66px; }
  .idea-menu-button { width: 42px; height: 42px; }
  .idea-hero { min-height: 560px; padding-top: 66px; background-position: 61% center; }
  .idea-hero__inner { width: calc(100% - 28px); }
  .idea-hero__content { margin: 0; padding: 30px 18px; background: rgba(255,255,255,.30); border-radius: 14px; backdrop-filter: blur(2px); }
  .idea-hero h1 { font-size: 2rem; }
  .idea-hero p { font-size: .91rem; }
  .idea-services-grid, .idea-welfare-grid { grid-template-columns: 1fr; }
  .idea-service-card, .idea-service-card--last { grid-column: auto; min-height: 0; padding: 28px 24px 26px 90px; }
  .idea-service-card__icon { top: 27px; left: 22px; width: 50px; height: 50px; }
  .idea-banners { gap: 18px; }
  .idea-corporate-grid { gap: 24px; }
  .idea-corporate-row { grid-template-columns: 105px 1fr; }
  .idea-corporate-row dt, .idea-corporate-row dd { padding: 13px 12px; font-size: .8rem; }
  .idea-contact-form dt, .idea-contact-form dd { padding: 14px; }
  .idea-footer { padding-top: 55px; }
}


/* =========================================================
   IDEA Original 1.1 — visual refinement
   Key color: #03A2AD
   ========================================================= */
:root {
  --idea-blue: #03A2AD;
  --idea-blue-dark: #164552;
  --idea-cyan: #03A2AD;
  --idea-cyan-dark: #027C85;
  --idea-pale: #eefafa;
  --idea-text: #20343b;
  --idea-muted: #60747b;
  --idea-line: rgba(3,162,173,.18);
  --idea-shadow: 0 18px 45px rgba(20,69,82,.13), 0 3px 10px rgba(20,69,82,.06);
  --idea-shadow-strong: 0 25px 65px rgba(20,69,82,.19), 0 6px 18px rgba(20,69,82,.08);
  --idea-radius: 16px;
}

body {
  background: #fff;
  color: var(--idea-text);
}

.idea-section {
  position: relative;
  overflow: hidden;
  padding: 104px 0;
}
.idea-section--soft {
  background:
    radial-gradient(circle at 8% 12%, rgba(3,162,173,.09), transparent 28%),
    linear-gradient(180deg, #f7fcfc 0%, #eef8f8 100%);
}
.idea-section-heading {
  position: relative;
  z-index: 1;
  margin-bottom: 52px;
}
.idea-section-heading::after {
  content: "";
  display: block;
  width: 68px;
  height: 3px;
  margin: 18px auto 0;
  background: linear-gradient(90deg, transparent, #03A2AD 18%, #03A2AD 82%, transparent);
}
.idea-section-heading__en {
  color: #164552;
  font-weight: 900;
  letter-spacing: .11em;
}
.idea-section-heading__ja { color: #4f747b; }

/* Clear, highly translucent header */
.idea-header {
  height: 78px;
  background: rgba(255,255,255,.66);
  border-bottom: 1px solid rgba(255,255,255,.58);
  box-shadow: 0 7px 26px rgba(22,69,82,.08);
  -webkit-backdrop-filter: blur(16px) saturate(145%);
  backdrop-filter: blur(16px) saturate(145%);
}
.idea-header::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(3,162,173,.38), transparent);
}
.idea-logo img { width: 178px; filter: drop-shadow(0 2px 6px rgba(255,255,255,.7)); }
.idea-nav a { color: #164552; font-weight: 900; }
.idea-nav a::after {
  content: "";
  display: block;
  width: 0;
  height: 2px;
  margin-top: 4px;
  background: #03A2AD;
  transition: width .25s ease;
}
.idea-nav a:hover::after { width: 100%; }

/* Hero: centered, strong and sharp */
.idea-hero {
  min-height: 680px;
  padding-top: 78px;
  position: relative;
  isolation: isolate;
  background: url('img/img-header.jpg') center 45% / cover no-repeat;
}
.idea-hero::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -54px;
  z-index: -1;
  width: min(78vw, 1000px);
  height: 108px;
  transform: translateX(-50%);
  background: rgba(255,255,255,.42);
  filter: blur(38px);
  border-radius: 50%;
}
.idea-hero__inner {
  width: min(calc(100% - 48px), 1320px);
  display: flex;
  justify-content: center;
}
.idea-hero__content {
  max-width: none;
  margin: 0;
  padding: 46px 54px;
  text-align: center;
  background: rgba(255,255,255,.8);
}
.idea-hero h1 {
  margin: 0 0 22px;
  color: #004c77;
  font-size: clamp(2.65rem, 4.15vw, 4.75rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: .035em;
  white-space: nowrap;
  text-shadow: 0 4px 2px rgba(255,255,255,.6);
}
.idea-hero h1 span { margin-left: .12em; color: #004c77; }
.idea-hero p {
  color: #004c77;
  font-size: clamp(1rem, 1.35vw, 1.2rem);
  letter-spacing: .035em;
  line-height: 2;
  text-shadow: 0 4px 2px rgba(255,255,255,.8);
}

/* Services: stronger icons and visual depth */
.idea-services-grid { gap: 30px; }
.idea-service-card {
  min-height: 258px;
  padding: 38px 38px 34px 146px;
  border: 1px solid rgba(3,162,173,.16);
  border-radius: 18px;
  background:
    linear-gradient(145deg, rgba(255,255,255,.99), rgba(246,252,252,.95));
  box-shadow: var(--idea-shadow);
  overflow: hidden;
  transition: transform .28s ease, box-shadow .28s ease, border-color .28s ease;
}
.idea-service-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 5px;
  background: #03A2AD;
}
.idea-service-card::after {
  content: "";
  position: absolute;
  right: -62px;
  bottom: -72px;
  width: 180px;
  height: 180px;
  border: 28px solid rgba(3,162,173,.06);
  border-radius: 50%;
  pointer-events: none;
}
.idea-service-card:hover {
  transform: translateY(-8px);
  border-color: rgba(3,162,173,.35);
  box-shadow: var(--idea-shadow-strong);
}
.idea-service-card__icon {
  top: 38px;
  left: 38px;
  width: 84px;
  height: 84px;
  color: #fff;
  background: linear-gradient(145deg, #12b7c1, #028892);
  border: 5px solid rgba(255,255,255,.88);
  border-radius: 22px;
  box-shadow: 0 14px 28px rgba(3,162,173,.28), inset 0 1px rgba(255,255,255,.35);
  transform: rotate(-3deg);
}
.idea-service-card__icon svg { width: 43px; height: 43px; }
.idea-service-card h3 { position: relative; z-index: 1; font-size: 1.12rem; }
.idea-service-card h3 a { color: #027c85; text-decoration-thickness: 1px; }
.idea-service-card p { position: relative; z-index: 1; color: #51686f; font-size: .91rem; }

/* Welfare cards */
.idea-welfare-card a {
  padding-bottom: 18px;
  background: #fff;
  border: 1px solid rgba(3,162,173,.14);
  border-radius: 17px;
  box-shadow: 0 13px 34px rgba(20,69,82,.10);
  overflow: hidden;
  transition: transform .28s ease, box-shadow .28s ease;
}
.idea-welfare-card a:hover { transform: translateY(-7px); box-shadow: var(--idea-shadow-strong); }
.idea-welfare-card img { border-radius: 0; box-shadow: none; }
.idea-welfare-card a:hover img { transform: scale(1.025); opacity: 1; }
.idea-welfare-card__type { color: #027c85; }
.idea-welfare-card__name { padding-inline: 12px; color: #20343b; }

/* Equal-size banners */
.idea-banner-block {
  position: relative;
  padding: 86px 0;
  background: linear-gradient(135deg, #163f4a 0%, #18505b 58%, #067d86 100%);
  overflow: hidden;
}
.idea-banner-block::before {
  content: "";
  position: absolute;
  width: 360px;
  height: 360px;
  top: -210px;
  right: -80px;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 50%;
  box-shadow: 0 0 0 60px rgba(255,255,255,.025), 0 0 0 120px rgba(255,255,255,.018);
}
.idea-banner-title { position: relative; color: #fff; font-size: 1.35rem; font-weight: 900; letter-spacing: .05em; }
.idea-banner-note { position: relative; color: rgba(255,255,255,.82); font-size: .92rem; }
.idea-banners {
  position: relative;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 28px;
  align-items: stretch;
}
.idea-banners a {
  aspect-ratio: 16 / 6.5;
  display: grid;
  border-radius: 30px;
  box-shadow: 0 22px 50px rgba(0,29,35,.30);
}
.idea-banners a:hover { opacity: 1; transform: translateY(-7px); }
.idea-banners img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* President's message: serif and dignified */
.idea-message {
  position: relative;
  max-width: 970px;
  padding: 54px 64px;
  background: rgba(255,255,255,.92);
  border: 1px solid rgba(3,162,173,.15);
  box-shadow: var(--idea-shadow);
}
.idea-message::before {
  content: "“";
  position: absolute;
  top: -24px;
  left: 26px;
  color: rgba(3,162,173,.18);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 9rem;
  line-height: 1;
}
.idea-message p {
  position: relative;
  margin-bottom: 22px;
  color: #344c53;
  font-family: "Yu Mincho", "YuMincho", "Hiragino Mincho ProN", "Hiragino Mincho Pro", "Noto Serif JP", Georgia, serif;
  font-size: 1rem;
  line-height: 2.15;
  letter-spacing: .025em;
}
.idea-message__signature {
  margin-top: 40px !important;
  font-family: "Yu Mincho", "YuMincho", "Hiragino Mincho ProN", "Noto Serif JP", Georgia, serif !important;
  font-size: 1.06rem !important;
  font-weight: 700;
  letter-spacing: .06em !important;
}

/* Corporate/contact surfaces */
.idea-corporate-grid,
.idea-contact-form {
  position: relative;
  z-index: 1;
}
.idea-corporate-list {
  overflow: hidden;
  background: #fff;
  border: 1px solid rgba(3,162,173,.14);
  border-radius: 12px;
  box-shadow: 0 14px 38px rgba(20,69,82,.08);
}
.idea-corporate-row dt { color: #17636b; background: #edf8f8; }
.idea-contact-form {
  padding: 34px;
  background: rgba(255,255,255,.94);
  border: 1px solid rgba(3,162,173,.16);
  border-radius: 16px;
  box-shadow: var(--idea-shadow);
}
.idea-contact-form input[type="submit"] {
  min-width: 190px;
  padding: 15px 38px;
  background: #03A2AD;
  border-radius: 6px;
  box-shadow: 0 10px 24px rgba(3,162,173,.25);
}
.idea-contact-form input[type="submit"]:hover { background: #027c85; transform: translateY(-2px); }

.idea-footer { background: #153e49; border-top: 4px solid #03A2AD; }
.idea-footer h3 { color: #8de1e5; }
.idea-footer p, .idea-footer li { color: rgba(255,255,255,.74); }
.idea-footer a { color: #b7edf0; }
.idea-copyright { border-top-color: rgba(255,255,255,.14); color: rgba(255,255,255,.52); }
.idea-go-top { background: #03A2AD; box-shadow: 0 10px 24px rgba(3,162,173,.28); }

@media (max-width: 1100px) {
  .idea-hero h1 { font-size: clamp(2.35rem, 4.5vw, 4rem); }
}

@media (max-width: 900px) {
  .idea-header { background: rgba(255,255,255,.78); }
  .idea-nav { top: 78px; background: rgba(22,69,82,.98); }
  .idea-hero__content { padding: 40px 30px; }
  .idea-hero h1 { white-space: normal; }
  .idea-service-card { padding-left: 136px; }
  .idea-banners { grid-template-columns: 1fr; max-width: 760px; margin-inline: auto; }
  .idea-banners a { aspect-ratio: 16 / 6.5; }
}

@media (max-width: 680px) {
  .idea-section { padding: 76px 0; }
  .idea-header { height: 66px; }
  .idea-nav { top: 66px; }
  .idea-hero { min-height: 590px; padding-top: 66px; }
  .idea-hero__content {
    padding: 32px 18px;
    border-radius: 0;
  }
  .idea-hero h1 { font-size: clamp(0.8rem, 7vw, 1.8rem); line-height: 1.28; }
  .idea-hero h1 span { display: block; margin: .08em 0 0; }
  .idea-hero p br { display: none; }
  .idea-service-card,
  .idea-service-card--last {
    padding: 126px 24px 30px;
  }
  .idea-service-card__icon {
    top: 26px;
    left: 24px;
    width: 78px;
    height: 78px;
  }
  .idea-service-card__icon svg { width: 40px; height: 40px; }
  .idea-message { padding: 42px 24px 34px; }
  .idea-message p { font-size: .94rem; line-height: 2; }
  .idea-banners { gap: 18px; }
  .idea-contact-form { padding: 22px 14px; }
}
/* Turnstileの「成功しました！」枠を非表示にする
.cf-turnstile,
.cf-turnstile-wrapper,
iframe[src*="challenges.cloudflare.com"] {
    display: none !important;
} */