/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Noto Sans JP', sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #fff;
}

.main-container {
  width: 100%;
  margin: 0 auto;
  background-color: #fff;
}

/* Overview Section */
.overview-section {
  display: flex;
  flex-direction: column;
  width: 100%;
  align-items: center;
  justify-content: center;
  gap: 20px;
  padding: 117px 311px;
  position: relative;
  background: url('../img/../img/shinkin_img/Frame2.jpg') 50% 50% / cover;
  min-height: 400px;
}

.overview-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
}

.main-title {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #003993;
  font-size: 48px;
  text-align: center;
  line-height: normal;
}

.subtitle {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #000;
  font-size: 20px;
  text-align: center;
  line-height: normal;
}

/* Resource Section */
.resource-section {
  position: relative;
  width: 100%;
  background: url('../img/shinkin_img/mv_bg.webp') 50% 50% / cover;
}

.resource-container {
  position: relative;
  width: 100%;
  max-width: 1200px;
  height: 100%;
  margin: 0 auto;
  padding: 0 16px;
}

.breadcrumb {
  position: relative;
  padding: 0 0 10px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb-link {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 14px;
  color: #808080;
  text-decoration: none;
}

.breadcrumb-separator {
  color: #808080;
}

.breadcrumb-current {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 14px;
  color: #808080;
}

.resource-content {
  position: relative;
  max-width: 1200px;
  height: 400px;
}

.resource-content::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('../img/shinkin_img/mv_image_02.webp');
  background-repeat: no-repeat;
  background-size: 60%;
  opacity: 0.7;
}

.resource-text {
  position: absolute;
  right: 0;
  width: 600px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 25px;
}

.resource-text-top,
.resource-text-bottom {
  text-shadow: 0px 4px 4px rgba(0, 0, 0, 0.25);
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #fff;
  font-size: 48px;
  letter-spacing: 7.2px;
  line-height: normal;
}

.resource-text-bottom {
  text-align: right;
}

/* Service Section */
.service-section {
  display: flex;
  justify-content: center;
  padding: 40px 20px;
  width: 100%;
}

.service-section a {
  text-decoration: none;
}

.service-card {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  background-color: #003993;
  border-radius: 20px;
  box-shadow: 0px 8px 8px rgba(0, 0, 0, 0.25);
  overflow: hidden;
  transition: all 0.3s ease;
}

.service-card:hover {
  box-shadow: 0px 12px 12px rgba(0, 0, 0, 0.5);
}

.service-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px 22px;
}

.service-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  max-width: 518px;
}

.service-line {
  width: 36.06px;
  height: 35.36px;
  object-fit: cover;
}

.service-title {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #fff;
  font-size: 30px;
  text-align: center;
  letter-spacing: 1.5px;
  line-height: normal;
}

.service-subtitle {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #fff;
  font-size: 48px;
  text-align: right;
  letter-spacing: 2.4px;
  line-height: normal;
  margin-top: 8px;
}

/* Feature Section (Table of Contents) */
.feature-section {
  display: flex;
  justify-content: center;
  padding: 40px 20px;
  width: 100%;
}

.toc-card {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  background-color: #f4f4f4;
  border-radius: 10px;
  border: 1px solid #c0c0c0;
  padding: 20px 24px;
}

.toc-title {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #4d4d4d;
  font-size: 24px;
  letter-spacing: 1.2px;
  text-align: center;
  margin-bottom: 20px;
}

.toc-content {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 400;
  color: #4d4d4d;
  font-size: 16px;
  letter-spacing: 1.6px;
  line-height: 30px;
}

/* Info Section (Challenges) */
.info-section {
  display: flex;
  flex-direction: column;
  width: 100%;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 16px 0;
  position: relative;
  overflow: hidden;
}

.section-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 10px 0;
  position: relative;
  width: 100%;
}

.section-title {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #4d4d4d;
  font-size: 24px;
  text-align: center;
  letter-spacing: 1.2px;
  line-height: 20px;
  white-space: nowrap;
  position: relative;
  padding-bottom: 15px;
}

.section-title::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: 0;
  width: 135px;
  border-bottom: 3px solid #009245;
}

.challenges-container {
  position: relative;
  width: 100%;
  height: 374px;
}

.challenges-container_inner {
  position: relative;
  width: 1000px;
  margin: 0 auto;
}

.challenge-card {
  display: flex;
  flex-direction: column;
  width: 250px;
  height: 130px;
  align-items: center;
  justify-content: center;
  position: absolute;
  background-color: #5F86C5;
  border-radius: 20px;
  overflow: visible;
  padding: 20px;
}

.challenge-1 {
  top: 204px;
  left: 0;
}

.challenge-1::after {
  content: '';
  position: absolute;
  right: -14px;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-left: 15px solid #5F86C5;
  border-top: 15px solid transparent;
  border-bottom: 15px solid transparent;
}

.challenge-2 {
  top: 30px;
  left: 226px;
}

.challenge-2::after {
  content: '';
  position: absolute;
  bottom: -14px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-top: 15px solid #5F86C5;
  border-left: 15px solid transparent;
  border-right: 15px solid transparent;
}

.challenge-3 {
  top: 30px;
  left: 525px;
}

.challenge-3::after {
  content: '';
  position: absolute;
  bottom: -14px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-top: 15px solid #5F86C5;
  border-left: 15px solid transparent;
  border-right: 15px solid transparent;
}

.challenge-4 {
  top: 204px;
  left: 750px;
}

.challenge-4::after {
  content: '';
  position: absolute;
  left: -14px;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-right: 15px solid #5F86C5;
  border-top: 15px solid transparent;
  border-bottom: 15px solid transparent;
}

.challenge-card p {
  width: 100%;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #fff;
  font-size: 16px;
  letter-spacing: 0.8px;
  line-height: 25px;
  text-align: center;
}

.challenge-images {
  display: flex;
  width: 280px;
  height: 155px;
  align-items: center;
  justify-content: center;
  gap: 15px;
  position: absolute;
  top: 219px;
  left: 361px;
}

.challenge-image-1,
.challenge-image-2 {
  position: relative;
  width: 110px;
  height: 155px;
}

.challenge-image-1 {
  background: url('../img/shinkin_img/nayami_img_left.png') no-repeat 50% 50% / cover;
}

.challenge-image-2 {
  background: url('../img/shinkin_img/nayami_img_right.png') no-repeat 50% 50% / cover;
}

.matrix-section {
  position: relative;
  width: 100%;
  background-color: #ebf3f7;
  padding: 50px 0;
  z-index: 1;
}

.matrix-container {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
}

.quadrant-container {
  text-align: center;
}

.efficiency-quadrant {
  background-color: #ffd09a;
}

.resource-quadrant {
  background-color: #afceff;
}

.quadrant-title {
  position: absolute;
  width: 100%;
  top: 12px;
  left: 0;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  font-size: 24px;
  text-align: center;
  letter-spacing: 1.2px;
  line-height: 25px;
  white-space: nowrap;
}

.efficiency-quadrant .quadrant-title {
  color: #f7931e;
}

.resource-quadrant .quadrant-title {
  color: #003993;
}

.quadrant-section {
  position: absolute;
}

.quadrant-section h4 {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #000;
  font-size: 20px;
  text-align: center;
  letter-spacing: 1px;
  line-height: 25px;
  margin-bottom: 24px;
}

.quadrant-section p {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 400;
  color: #000;
  font-size: 16px;
  letter-spacing: 0.8px;
  line-height: 25px;
}

.matrix-labels {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
}

.label {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 14px;
  position: absolute;
  background-color: #fff;
  border-radius: 5px;
  overflow: hidden;
  box-shadow: 0px 0px 4px rgba(0, 0, 0, 0.25);
}

.label-top {
  top: 36px;
  left: 50%;
  transform: translateX(-50%);
}

.label-right {
  top: 289px;
  right: 142px;
}

.label-left {
  top: 289px;
  left: 142px;
}

.label-bottom {
  top: 552px;
  left: 50%;
  transform: translateX(-50%);
}

.label div {
  position: relative;
  width: fit-content;
  margin-top: -1px;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #4d4d4d;
  font-size: 20px;
  letter-spacing: 1px;
  line-height: 25px;
  text-align: center;
}

.message-section {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 80px 20px;
  background-color: #f7931e;
}

.message-decoration {
  position: absolute;
  bottom: -38px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 39px
}

.message-text {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 600;
  color: #fff;
  font-size: 48px;
  text-align: center;
  letter-spacing: 2.4px;
  line-height: 25px;
}

/* Details Section (Services) */
.details-section {
  width: 100%;
  padding: 64px 0;
  position: relative;
  opacity: 1 !important;
  transform: translateY(0) !important;
}

.service-section-header {
  margin-bottom: 50px;
}

.service-detail-card {
  width: 100%;
  max-width: 1000px;
  margin: 0 auto 48px;
  background-color: #ebf3f7;
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0px 4px 4px rgba(0, 0, 0, 0.25);
}

.service-header-bar {
  background-color: #003993;
  padding: 19px 0;
  color: #fff;
  font-size: 24px;
  text-align: center;
  letter-spacing: 1.2px;
  line-height: 20px;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
}

.service-subtitle-section {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 45px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 205px;
  margin-top: 19px;
}

.service-subtitle-section h3 {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #000;
  font-size: 24px;
  text-align: center;
  letter-spacing: 1.2px;
  line-height: 20px;
  white-space: nowrap;
}

.service-concerns {
  margin: 10px 30px;
}

.service-concerns .concerns-label {
  position: relative;
  width: 185px;
  height: 24px;
  background-color: #fff;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #f7931e;
  font-size: 16px;
  text-align: center;
  letter-spacing: 0.8px;
  line-height: 20px;
  white-space: nowrap;
}

.service-concerns .concerns-text {
  background-color: #fff;
  padding: 16px;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #000;
  font-size: 18px;
  text-align: center;
  letter-spacing: 1.8px;
  line-height: 25px;
}

.service-info-container {
  display: flex;
  align-items: stretch;
  gap: 10px;
  margin: 0 30px;
}

.service-info-box {
  display: flex;
  flex-direction: column;
  width: 250px;
  align-items: center;
  justify-content: center;
  gap: 25px;
  padding: 20px 0;
  position: relative;
  background-color: #fff;
}

.service-info-box h4 {
  position: relative;
  height: 30px;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #000;
  font-size: 20px;
  text-align: center;
  letter-spacing: 1px;
  line-height: 20px;
}

.service-image {
  position: relative;
  width: 139px;
  height: 102px;
}

.buntan-image {
  background: url('../img/shinkin_img/service_icon01.png') no-repeat 50% 50% / contain;
}

.storage-image {
  background: url('../img/shinkin_img/service_icon02.png') no-repeat 50% 50% / contain;
}

.disposal-image {
  background: url('../img/shinkin_img/service_icon03.png') no-repeat 50% 50% / contain;
}

.service-info-box p {
  position: relative;
  width: 201px;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 400;
  color: #000;
  font-size: 16px;
  text-align: center;
  letter-spacing: 0.8px;
  line-height: 20px;
}

.service-features-box {
  position: relative;
  width: 680px;
  background-color: #fff;
  padding: 25px;
}

.service-features-box h4 {
  height: 20px;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #003993;
  font-size: 18px;
  text-align: center;
  letter-spacing: 0.9px;
  line-height: 20px;
  white-space: nowrap;
  margin-bottom: 28px;
}

.feature-item {
  margin-bottom: 20px;
}

.feature-item h5 {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #003993;
  font-size: 16px;
  text-align: left;
  letter-spacing: 0.8px;
  line-height: 20px;
  white-space: nowrap;
  margin-bottom: 8px;
}

.feature-item p {
  width: 580px;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 400;
  color: #000;
  font-size: 16px;
  letter-spacing: 0.8px;
  line-height: 25px;
}

.highlight {
  color: #f7931e;
}

.service-details-link {
  display: flex;
  justify-content: flex-end;
  margin: 16px 16px 16px 0;
}

.details-button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 10px 0;
  color: #003993;
  text-decoration: none;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.9px;
  line-height: 25px;
  white-space: nowrap;
  transition: all 0.3s ease;
}

.details-button:hover {
  transform: translateX(5px);
}

.details-button img {
  width: 24px;
  height: 24px;
}

/* Additional sections for document storage */
.additional-section {
  margin: 32px;
}

.additional-section h3 {
  display: flex;
  flex-direction: column;
  width: 100%;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #000;
  font-size: 24px;
  text-align: center;
  letter-spacing: 1.2px;
  line-height: 20px;
  white-space: nowrap;
  margin-bottom: 32px;
}

.point-section {
  display: flex;
  flex-direction: column;
  width: 100%;
  align-items: flex-start;
  padding: 10px;
}

.point-label {
  position: relative;
  width: 118px;
  height: 24px;
  background-color: #fff;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #f7931e;
  font-size: 16px;
  text-align: center;
  letter-spacing: 0.8px;
  line-height: 20px;
  white-space: nowrap;
}

.point-text {
  background-color: #fff;
  padding: 16px;
  width: 100%;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #000;
  font-size: 18px;
  text-align: center;
  letter-spacing: 1.8px;
  line-height: 25px;
}

.support-image {
  position: relative;
  width: 100%;
  height: 65px;
  background: url('../img/shinkin_img/storage_period.jpg') 50% 50% / cover;
  margin: 16px 0 0;
}

.support-note {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 400;
  color: #000;
  font-size: 14px;
  letter-spacing: 0.7px;
  line-height: 25px;
  white-space: nowrap;
  text-align: right;
}

.security-section {
  margin: 32px;
}

.security-section h3 {
  display: flex;
  flex-direction: column;
  width: 100%;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #000;
  font-size: 24px;
  text-align: center;
  letter-spacing: 1.2px;
  line-height: 20px;
  white-space: nowrap;
  margin-bottom: 16px;
}

.security-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(2, 1fr);
  width: 100%;
  gap: 15px;
  padding: 15px;
  background-color: #fff;
}

.security-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  padding: 12px 11px;
  background-color: #f4f4f4;
  border-radius: 5px;
  overflow: hidden;
}

.security-image {
  position: relative;
  width: 150px;
  height: 88px;
}

.security-1 {
  background: url('../img/shinkin_img/system_image01.png') 50% 50% / cover;
}

.security-2 {
  background: url('../img/shinkin_img/system_image02.png') 50% 50% / cover;
}

.security-3 {
  background: url('../img/shinkin_img/system_image03.png') 50% 50% / cover;
}

.security-4 {
  background: url('../img/shinkin_img/system_image04.png') 50% 50% / cover;
}

.security-5 {
  background: url('../img/shinkin_img/system_image05.png') 50% 50% / cover;
}

.security-6 {
  background: url('../img/shinkin_img/system_image06.png') 50% 50% / cover;
}

.security-7 {
  background: url('../img/shinkin_img/system_image07.png') 50% 50% / cover;
}

.security-8 {
  background: url('../img/shinkin_img/system_image08.png') 50% 50% / cover;
}

.security-item p {
  position: relative;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 400;
  color: #000;
  font-size: 14px;
  letter-spacing: 0;
  line-height: 18px;
}

/* Contact Section (Flow) */
.contact-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 40px;
  padding: 40px 20px 0;
  background-color: #ebf3f7;
}

.flow-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 21px 0;
}

.flow-step {
  display: flex;
  width: 100%;
  max-width: 1000px;
  align-items: flex-start;
  justify-content: space-between;
  padding: 10px;
  background-color: #fff;
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0px 4px 4px rgba(0, 0, 0, 0.25);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.step-card {
  display: flex;
  width: 100%;
  padding: 0;
}

.step-icon-section {
  display: flex;
  flex-direction: column;
  width: 147px;
  height: 163px;
  align-items: center;
  gap: 10px;
  padding: 11px 14px;
}

.step-number {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #003993;
  font-size: 24px;
  text-align: center;
  letter-spacing: 1.2px;
  line-height: 20px;
  white-space: nowrap;
}

.step-icon {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 18px;
}

.step-icon img {
  width: 84px;
  height: 84px;
}

.step-content {
  flex: 1;
  height: 144px;
}

.step-content h4 {
  width: 522px;
  height: 33px;
  margin-top: 8px;
  margin-left: 12px;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #000;
  font-size: 20px;
  letter-spacing: 1px;
  line-height: 20px;
}

.step-content p {
  margin-top: 15px;
  margin-left: 14px;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 400;
  color: #000;
  font-size: 18px;
  line-height: 30px;
}

.flow-arrow {
  align-self: center;
}

.flow-arrow img {
  display: block;
}

/* Gallery Section */
.gallery-section {
  display: flex;
  justify-content: center;
  padding: 40px 20px;
}

.gallery-card {
  width: 100%;
  max-width: 800px;
  background-color: #003993;
  border-radius: 20px;
  box-shadow: 0px 8px 8px rgba(0, 0, 0, 0.25);
  overflow: hidden;
}

.gallery-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.gallery-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  max-width: 518px;
}

.gallery-line {
  width: 36.06px;
  height: 35.36px;
  object-fit: cover;
}

.gallery-title {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #fff;
  font-size: 30px;
  text-align: center;
  letter-spacing: 1.5px;
}

.gallery-subtitle {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: #fff;
  font-size: 48px;
  text-align: right;
  letter-spacing: 2.4px;
  margin-top: 8px;
}

/* Responsive Design */
@media (max-width: 1200px) {
  .pc-only {
    display: none;
  }

  .overview-section {
    padding: 80px 50px;
  }

  .main-title {
    font-size: 36px;
  }

  .subtitle {
    font-size: 18px;
  }

  .resource-content {
    flex-direction: column;
    height: auto;
  }

  .resource-image,
  .resource-text {
    width: 100%;
  }

  .resource-text-top,
  .resource-text-bottom {
    font-size: 36px;
    text-align: center;
  }

  .service-detail-card {
    width: 90%;
  }

  .service-concerns .concerns-text {
    font-size: 16px;
  }

  .service-subtitle-section h3 {
    font-size: 18px;
    white-space: normal;
  }

  .feature-item h5 {
    white-space: normal;
  }

  .message-text {
    font-size: 32px;
  }

  .challenges-container {
    height: auto;
    position: relative;
  }

  .challenges-container_inner {
    width: 100%;
  }

  .challenge-card {
    position: relative;
    margin: 10px auto;
    top: auto !important;
    left: auto !important;
  }

  .challenge-images {
    position: relative;
    top: auto;
    left: auto;
    margin: 20px auto;
  }

  .quadrant-container {
    flex-direction: column;
    width: 100%;
  }

  .quadrant-container img {
    width: 100%;
  }

  .quadrant {
    width: 100%;
    max-width: 400px;
    height: 300px;
  }

  .service-info-container {
    flex-direction: column;
    align-items: center;
  }

  .service-features-box {
    width: 100%;
    height: auto;
  }

  .feature-item p {
    width: 100%;
  }

  .step-content {
    height: auto;
  }

  .step-content h4 {
    width: 100%;
    margin: 0;
    padding: 10px;
    height: auto;
  }

  .step-content p {
    width: 100%;
    margin: 0;
    padding: 10px
  }

  .security-grid {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(4, 1fr);
  }

  .support-image {
    height: 65px;
    background: url('../img/shinkin_img/storage_period.jpg') no-repeat 50% 50% / contain;
  }

  .additional-section h3 {
    font-size: 18px;
    white-space: normal;
  }

  .security-section h3 {
    font-size: 18px;
    white-space: normal;
  }
}

@media (max-width: 768px) {
  .overview-section {
    padding: 60px 20px;
  }

  .main-title {
    font-size: 28px;
  }

  .subtitle {
    font-size: 16px;
  }

  .service-title,
  .gallery-title {
    font-size: 24px;
  }

  .service-subtitle,
  .gallery-subtitle {
    font-size: 32px;
  }

  .message-text {
    font-size: 32px;
  }

  .resource-container {
    height: 240px;
  }

  .resource-content::before {
    height: 240px;
    background-size: cover;
    background-position: center;
  }

  .challenge-1::after,
  .challenge-2::after,
  .challenge-3::after,
  .challenge-4::after {
    display: none;
  }

  .resource-text-top,
  .resource-text-bottom {
    font-size: 24px;
  }

  .step-icon-section {
    width: 100px;
  }

  .step-icon img {
    width: 60px;
    height: 60px;
  }

  .security-grid {
    grid-template-columns: 1fr;
    grid-template-rows: repeat(8, 1fr);
  }

  .service-subtitle-section {
    padding: 0 20px;
  }

  .service-concerns,
  .additional-section,
  .security-section {
    margin: 16px;
  }

  .service-info-container {
    margin: 0 16px;
  }
}

@media (max-width: 480px) {
  .main-title {
    font-size: 24px;
  }

  .service-title,
  .gallery-title {
    font-size: 14px;
  }

  .service-subtitle,
  .gallery-subtitle {
    font-size: 16px;
  }

  .service-line {
    width: 16px;
    height: 16px;
  }

  .message-text {
    font-size: 24px;
  }

  .challenge-card {
    width: 200px;
    height: 120px;
  }

  .challenge-card p {
    width: 180px;
    font-size: 14px;
  }

  .step-content h4 {
    font-size: 18px;
  }

  .step-content p {
    font-size: 16px;
  }
}

/* 鍵保管 */
.problem-section {
  position: absolute;
  top: 70px;
  left: 34px;
  width: 931px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 10px;
}

.problem-header {
  width: 100%;
  height: 24px;
  margin-bottom: 0;
}

.problem-label {
  width: 185px;
  height: 22px;
  background-color: white;
  font-weight: bold;
  color: #f7931e;
  font-size: 16px;
  text-align: center;
  letter-spacing: 0.8px;
  line-height: 20px;
  padding: 1px 0;
}

.problem-description {
  width: 100%;
  height: 70px;
  background-color: white;
  display: flex;
  align-items: center;
  justify-content: center;
}

.problem-description p {
  width: 900px;
  font-weight: bold;
  color: black;
  font-size: 18px;
  text-align: center;
  letter-spacing: 1.8px;
  line-height: 25px;
}

/* Main content */
.problems-content {
  width: 940px;
  height: 300px;
  margin: 0 auto 20px;
  background-color: white;
}

/* Problems container */
.problems-container {
  position: relative;
  width: 910px;
  height: 115px;
  top: 4px;
  left: 1px;
  overflow: hidden;
}

.problem-item {
  position: absolute;
  width: 455px;
  height: 128px;
  top: 0;
}

.problem-item:first-child {
  left: 0;
}

.problem-item:last-child {
  left: 455px;
}

.problem-icon {
  position: absolute;
  background-size: cover;
  background-position: center;
}

.problem-icon-1 {
  width: 73px;
  height: 100px;
  top: 19px;
  left: 19px;
  background-image: url('../img/shinkin_img/kagihokan_img01.png');
  background-repeat: no-repeat;
}

.problem-icon-2 {
  width: 66px;
  height: 95px;
  top: 16px;
  left: 371px;
  background-image: url('../img/shinkin_img/kagihokan_img02.png');
  background-repeat: no-repeat;
}

.problem-card {
  position: absolute;
  width: 316px;
  height: 80px;
  background-color: #ebf3f7;
  border-radius: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
}

.problem-item:first-child .problem-card {
  top: 21px;
  left: 124px;
}

.problem-item:last-child .problem-card {
  top: 20px;
  left: 15px;
}

.problem-card p {
  width: 279px;
  height: 55px;
  font-weight: 500;
  color: black;
  font-size: 16px;
  text-align: center;
  letter-spacing: 0.8px;
  line-height: 20px;
}

.polygon {
  position: absolute;
  width: 12px;
  height: 14px;
}

.polygon-1 {
  top: 50%;
  left: -10px;
}

.polygon-2 {
  top: 50%;
  right: -10px;
}

/* Features section */
.features-section {
  width: 940px;
  height: 202px;
}

.features-title {
  font-weight: bold;
  color: #003993;
  font-size: 18px;
  text-align: center;
  letter-spacing: 0.9px;
  line-height: 20px;
  white-space: nowrap;
}

.features-container {
  width: 100%;
  display: flex;
  gap: 32px;
  margin-top: 15px;
}

.feature-card {
  width: 285px;
  height: 125px;
  background-color: #ebf3f7;
  border-radius: 10px;
  box-shadow: 0px 2px 2px rgba(0, 0, 0, 0.25);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.feature-card:first-child {
  margin-left: 10px;
}

.feature-title {
  height: 36px;
  font-weight: bold;
  color: black;
  font-size: 18px;
  text-align: center;
  letter-spacing: 0.9px;
  line-height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: -1px;
}

.feature-content {
  position: relative;
  flex: 1;
  height: 89px;
}

.feature-icon {
  position: absolute;
  width: 72px;
  height: 84px;
  top: 3px;
  left: 0;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-left: 8px;
}

.feature-icon img {
  width: 57px;
  height: 57px;
}

.feature-card:nth-child(2) .feature-icon img {
  width: 59px;
  height: 59px;
  margin-left: -1px;
}

.feature-card:nth-child(3) .feature-icon img {
  width: 60px;
  height: 60px;
  margin-left: -2px;
  margin-top: -1px;
}

.feature-description {
  position: absolute;
  width: 194px;
  height: 84px;
  top: 2px;
  left: 81px;
  font-weight: normal;
  color: black;
  font-size: 16px;
  line-height: 20px;
  letter-spacing: 0;
}

.feature-card:nth-child(3) .feature-description {
  width: 192px;
}

/* Responsive design */
@media (max-width: 1024px) {
  .frame {
    width: 90vw;
    height: auto;
    min-height: 538px;
  }

  .header {
    padding: 19px 20px;
  }

  .problem-section {
    width: 100%;
  }

  .problems-content {
    width: 100%;
    height: auto;
    padding-bottom: 30px;
    margin-bottom: 0;
  }

  .features-section {
    width: 100%;
    height: auto;
  }

  .problems-container {
    width: 100%;
    height: 320px;
  }

  .problem-item {
    position: relative;
    width: 100%;
    height: 120px;
    margin-bottom: 20px;
  }

  .problem-item:last-child {
    left: 0;
  }

  .features-container {
    flex-direction: column;
    align-items: center;
    gap: 20px;
  }

  .features-title {
    position: relative;
    left: 0;
    text-align: center;
    width: 100%;
    margin-bottom: 20px;
  }

  .problem-card {
    position: relative;
    width: 60%;
    height: auto;
    padding: 15px;
  }

  .problem-icon-2 {
    left: auto;
    right: 8%;
    height: 105px;
  }

  .problem-card p {
    height: auto;
  }
}

/* END_鍵保管 */