@charset "utf-8";
/* リセットCSS（最小構成） */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}
ul, ol {
  list-style: none;
}
a {
  text-decoration: none;
  color: inherit;
}
html {
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}
body {
  margin: 0;
  font-family: "Noto Sans JP", sans-serif;
  font-size: 16px;
  position: relative;
}
button, input, textarea, select {
  font: inherit;
}
table {
  border-collapse: collapse;
  border-spacing: 0;
}
.invisible {
    visibility: hidden;
}
.pc_only {
	display: block;
}
.sp_only {
	display: none;
}
.material-icons.pc_only {
	display: block;
}
.material-icons.sp_only {
	display: none;
}
.material-symbols-outlined.pc_only {
	display: block;
}
.material-symbols-outlined.sp_only {
	display: none;
}
.material-icons { font-family: 'Material Icons'; }
:root {
	--txt_strong: #18181B;
  	--txt_main: #52525B;
	--white: #FFFFFF;
  	--blue: #3B82F6;
	--blue_02: #1D4ED8;
	--blue_03: #DBEAFE;
  	--green: #00AF98;
  	--gray: #E9E9E9;
	--gray_02: #F8FAFC;
}

/* --------------------
   ヘッダー
-------------------- */
.header {
  background: #fff;
  border-bottom: 1px solid #ddd;
  height: auto;
  position: relative;
  z-index: 10;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
  padding: 10px;
}
.header-inner h1 {
	max-width: 200px;
}
.logo a {
  font-size: 24px;
  font-weight: bold;
  text-decoration: none;
  color: #333;
}

/* --------------------
   PCナビ
-------------------- */
.nav ul {
  display: flex;
  gap: 30px;
  font-size: clamp(14px, 1.5vw, 16px);
  white-space: nowrap;
}

.nav a {
  text-decoration: none;
  color: var(--txt_main);
  font-weight: 400;
  position: relative;
}
.nav a::after {
  background-color: var(--blue_02); /* 下線の色 */
  bottom: -4px; /* 要素の下端からの距離 */
  content: ""; /* 要素に内容を追加 */
  height: 2px; /* 下線の高さ */
  left: 0; /* 要素の左端からの距離 */
  position: absolute; /* 絶対位置指定 */
  transform: scale(0, 1); /* 下線を横方向に0倍、縦方向に1倍に変形（非表示） */
  transform-origin: center top; /* 変形の原点を中央上に指定 */
  transition: transform .3s; /* 変形をアニメーション化 */
  width: 100%; /* 要素の幅 */
}
.nav a:hover {
	color: var(--txt_strong);
	transition: transform .3s; /* 変形をアニメーション化 */
}
.nav a:hover::after {
  transform: scale(1, 1); /* 下線を横方向に1倍、縦方向に1倍に変形（表示） */
}
.nav .btn a {
	padding: 0.5rem 1.5rem;
	background: var(--green);
	color: var(--white);
	border-radius: 30px;
}
.nav .btn a:hover {
	filter: brightness(120%);
	transition: 0.2s;
}
.nav .btn a:hover::after {
  transform: scale(0, 0);
}
/* --------------------
   ハンバーガー（スマホ用）
-------------------- */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 9999;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background: #333;
  display: block;
  transition: 0.3s;
}

/* 開いたときの変化 */
.hamburger.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* --------------------
   メインビジュアル
-------------------- */
.mv_area {
	position: relative;
}
.mv {
	width: 100%;
	height: 75vh;
	overflow: hidden;
	background-size: cover;
	background-position: center 0;
	background-repeat: no-repeat;
	/* フェード用 */ 
	opacity: 1; 
	transition: opacity 1s ease;
	position: relative;
}
.mask {
  position: absolute;
  inset: 0;
  background: linear-gradient(75deg, rgba(29, 78, 216,0.6), rgba(29, 78, 216,0));
  z-index: 2;
}
.key_txt_area {
	position: absolute;
	inset: 0;
	z-index: 3;
	display: flex;
	align-items: center;
	justify-content: center;
}
.key_txt {
	width: 100%;
	max-width: 1200px;
	margin: auto;
}
.key_txt h2 {
	color: var(--white);
	font-weight: 900;
	font-size: clamp(24px, 4vw, 60px);
}
.inner {
	width: 100%;
	max-width: 1200px;
	margin: auto;
}
section {
	padding: 6rem 1rem;
}
.bg_white {
	background: var(--white);
}
.bg_gray {
	background: var(--gray_02);
}
.bg_blue {
	background: var(--blue_02);
}
.mb {
	margin-bottom: 4rem;
}
h3 {
	font-size: clamp(30px, 4vw, 48px);
	color: var(--txt_strong);
	line-height: 1.4;
}
h3 span.en_ttl {
	display: block;
	font-size: 1.0rem;
	font-weight: bold;
	color: var(--blue);
}
p {
	margin: 1.5rem 0;
	color: var(--txt_main);
	font-weight: normal;
}
p.strong {
	font-size: clamp(18px, 3vw, 22px);
	color: var(--txt_strong);
}
p span {
	display: block;
	color: var(--txt_strong);
	font-weight: 500;
}
.fl_box {
	display: flex;
	flex-wrap: wrap;
	width: 100%;
	align-items: center;
}
.box_left {
	width: 55%;
}
.box_right {
	width: 45%;
	padding: 2rem;
}
.service_item {
	display: flex;
	flex-wrap: nowrap;
	gap: 2rem;
	margin-bottom: 3rem;
}
.service_item .txt_area {
	width: 80%;
}
.service_item span.material-icons {
	font-size: 2rem;
	color: var(--blue_02);
	padding: 0.5rem;
	background-color: var(--blue_03);
	border-radius: 50px;
	width: 3rem;
	height: 3rem;
}
h4 {
	font-size: clamp(18px, 4vw, 20px);
	color: var(--txt_strong);
	font-weight: bold;
}
.btn_blue {
	display: inline-block;
	padding: 0.5rem 1.5rem;
    background: var(--blue);
    color: var(--white);
    border-radius: 30px;
}
.btn_blue:hover {
	filter: brightness(120%);
	transition: 0.2s;
}
.al_right {
	text-align: right;
}
.al_left {
	text-align: left;
}
.sec02 .fl_box {
	align-items: flex-start;
	justify-content: space-around;
}
.sec02 .fl_box .card {
	width: 30%;
	background: var(--white);
	padding: 1.5rem;
	border-radius: 5px;
	box-shadow: 0px 5px 10px 0px rgba(0, 0, 0, 0.2);
}
.card p {
	color: var(--txt_strong);
	font-weight: 500;
}
.card a {
	color: var(--blue);
	position: relative;
}
.card a::after {
  background-color: var(--blue_02); /* 下線の色 */
  bottom: -4px; /* 要素の下端からの距離 */
  content: ""; /* 要素に内容を追加 */
  height: 2px; /* 下線の高さ */
  left: 0; /* 要素の左端からの距離 */
  position: absolute; /* 絶対位置指定 */
  transform: scale(0, 1); /* 下線を横方向に0倍、縦方向に1倍に変形（非表示） */
  transform-origin: center top; /* 変形の原点を中央上に指定 */
  transition: transform .3s; /* 変形をアニメーション化 */
  width: 100%; /* 要素の幅 */
}
.card a:hover {
	color: var(--txt_strong);
	transition: transform .3s; /* 変形をアニメーション化 */
}
.card a:hover::after {
  transform: scale(1, 1); /* 下線を横方向に1倍、縦方向に1倍に変形（表示） */
}
.sec03 .box_left {
	width: 65%;
	padding: 0 1.5rem;
}
.sec03 .box_right {
	width: 50%;
	padding: 2rem 2rem 0;
}
.bg_sekine {
	background-image: url(https://www.iscf.co.jp/renew_cmn/img/sekine.png);
	background-repeat: no-repeat;
	background-position: right 5% bottom;
	background-size: 35% auto;
}
.sec04 .fl_box {
	margin-top: 2rem;
	justify-content: space-around;
}
.sec04 .fl_box .card {
	width: 40%;
	background: var(--white);
	padding: 1.5rem;
	border-radius: 5px;
	box-shadow: 0px 5px 10px 0px rgba(0, 0, 0, 0.2);
}
.sec05 h3 {
	text-align: center;
	color: var(--white);
}
.sec05 h3 span.en_ttl {
	color: var(--white);
}
.sec05 p {
	text-align: center;
	color: var(--blue_03);
}
.sec05 .fl_box {
	padding: 3rem 0;
	justify-content: center;
	gap: 3rem;
}
.sec05 .fl_box a {
	width: 25%;
	display: flex;
	flex-wrap: nowrap;
	align-items: center;
	padding: 1.0rem 1.5rem;
	justify-content: center;
	gap: 1.0rem;
	font-size: 1.0rem;
}
a.btn_white {
	background: var(--white);
	color: var(--blue_02);
	border-radius: 30px;
}
a.btn_green {
	background: var(--green);
	color: var(--white);
	border-radius: 30px;
}
.sec05 .fl_box a:hover {
	filter: brightness(120%);
	transition: 0.2s;
}
.page-top {
    display: none;
    position: fixed;
    right: 40px;
    bottom: 76px;
    z-index: 99;
    line-height: 1.2;
    margin-bottom: 0;
    opacity: 0.9;
}
.page-top a {
	display: flex;
	width: 50px;
	height: 50px;
	background: var(--blue);
	border-radius: 50px;
	color: var(--white);
	justify-content: center;
	align-items: center;
}
.page-top a span {
	font-size: 1.5rem;
}
/* --------------------
   フッター
-------------------- */
footer {
	background: var(--gray);
	padding: 3rem 0 1rem;
}
footer .left {
	width: 35%;
}
footer .left img {
	max-width: 150px;
}
footer .left p {
	font-size: 14px;
	margin: 0.5rem;
}
footer .right {
	width: 60%;
}
footer .right.fl_box {
	gap: 1.5rem;
}
footer .right a {
	width: 30%;
	color: var(--txt_main);
	font-size: 14px;
}
footer .right a:hover {
	color: var(--txt_strong);
}
footer p.copy {
	text-align: center;
	font-size: 14px;
	margin-top: 3rem;
}
/* --------------------
   スマホ表示
-------------------- */
@media (max-width: 767px) {
.pc_only {
	display: none;
}
.sp_only {
	display: block;
}
.material-icons.pc_only {
	display: none;
}
.material-icons.sp_only {
	display: block;
}
.material-symbols-outlined.pc_only {
	display: none;
}
.material-symbols-outlined.sp_only {
	display: block;
}
/* --------------------
   ヘッダー
-------------------- */
.header {
  background: rgba(255,255,255,0.8);
  border-bottom: 1px solid #ddd;
  max-height: 80px;
  position: fixed;
  width: 100%;
}
.header-inner h1 {
	max-width: 100px;
	position: relative;
	z-index: 1;
}
  .nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    height: auto;
    background: #fff;
    padding: 80px 20px 40px;
    transition: right 0.3s ease;
  }

  .nav.open {
    right: 0;
	box-shadow: 0 3px 5px rgba(0, 0, 0, 0.1);
  }
  .nav a {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

  .nav ul {
    flex-direction: column;
    gap: 20px;
  }
  .nav ul li {
	padding-bottom: 1.0rem;
	border-bottom: 1px solid var(--gray);
  }
  .nav ul li:last-child {
	border-bottom: none;
  }
  .nav ul li.btn {
	padding-top: 1.0rem;
	text-align: center;
  }
  .nav ul li.btn a {
	display: inline-block;
	width: 80%;
  }
  .hamburger {
    display: flex;
  }
  .mv {
	height: 65vh;
  }
  .key_txt {
	width: 80%;
	max-width: inherit;
	margin: auto;
}
section {
    padding: 3rem 1rem;
}
.box_left {
	width: 100%;
}
.box_right {
	width: 100%;
	padding: 0;
}
.fl_box {
	padding: 2rem 0;
}
.sec02 .fl_box {
	gap: 2rem;
}
.sec02 .fl_box .card {
	width: 100%;
}
.sec03 .box_left {
	width: 100%;
}
.sec03 .box_left img {
	width: 60%;
}
.bg_sekine {
	background-position: right 0% bottom;
    background-size: 60% auto;
}
.sec03 {
	padding-bottom: 20rem;
}
.sec04 .fl_box {
	gap: 2rem;
}
.sec04 .fl_box .card {
	width: 100%;
}
.sec05 p {
	text-align: left;
}
.sec05 .fl_box a {
	width: 80%;
}
.page-top {
	right: 20px;
	bottom: 20px;
}
footer {
	padding: 3rem 1rem 1rem;
}
footer .left {
	width: 100%;
}
footer .right {
	width: 100%;
}
footer .right a {
	width: 45%;
}
}

@media (max-width: 600px) {
	.sec03 .box_left img {
	width: 75%;
}
    .bg_sekine {
        background-size: 70% auto;
    }
}
@media (max-width: 500px) {
	.sec03 .box_left img {
	width: 100%;
}
}