/* ====================================
   Spine Function Page Styles
   Theme Color: Indigo (#3F51B5)
   ==================================== */

/* Fix for body opacity (overrides common.css) */
body.page-spine {
  opacity: 1 !important;
}
html.wf-active body.page-spine,
html.wf-inactive body.page-spine,
html.loading-delay body.page-spine {
  opacity: 1 !important;
}

/* ====================================
   Reset & Base
   ==================================== */
*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: "dnp-shuei-gothic-gin-std", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  vertical-align: bottom;
}

a {
  text-decoration: none;
  color: inherit;
}

ul, ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

h1, h2, h3, h4, h5, h6, p {
  margin: 0;
}

/* ====================================
   Header
   ==================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  height: 64px;
}

.header-logo a {
  display: flex;
  align-items: center;
  gap: 15px;
}

.header-logo img {
  height: 40px;
  width: auto;
}

.header-logo p {
  font-size: 13px;
  color: #333;
  white-space: nowrap;
}

.global-nav ul {
  display: flex;
  gap: 30px;
}

.global-nav a {
  font-size: 14px;
  color: #333;
  transition: color 0.3s;
}

.global-nav a:hover {
  color: var(--spine-primary);
}

.jc-button {
  display: none;
}

@media (max-width: 760px) {
  .header {
    padding: 0 20px;
    height: 15.3846153846dvw;
  }
  .header-logo img {
    height: 30px;
  }
  .header-logo p {
    display: none;
  }
  .global-nav {
    display: none;
  }
  .jc-button {
    display: block;
    position: fixed;
    top: 15px;
    right: 15px;
    z-index: 1001;
    cursor: pointer;
  }
  .jc-button div {
    width: 30px;
    height: 20px;
    position: relative;
  }
  .jc-button span {
    display: block;
    width: 100%;
    height: 2px;
    background: #333;
    position: absolute;
    left: 0;
    transition: all 0.3s;
  }
  .jc-button span:first-child {
    top: 0;
  }
  .jc-button span:last-child {
    bottom: 0;
  }
  .jc-button p {
    font-size: 10px;
    text-align: center;
    margin-top: 5px;
    color: #333;
  }
}

/* ====================================
   Footer
   ==================================== */
.footer {
  background: #1E1E1E;
  padding: 60px 20px;
  text-align: center;
}

.footer-logo {
  margin-bottom: 20px;
}

.footer-logo img {
  height: 40px;
  filter: brightness(0) invert(1);
}

.footer-company {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 10px;
}

.footer-address {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 15px;
}

.footer-address a {
  color: var(--spine-primary-light);
  margin-left: 10px;
}

.footer-copyright {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
}

@media (max-width: 760px) {
  .footer {
    padding: 40px 20px;
  }
  .footer-logo img {
    height: 30px;
  }
  .footer-company {
    font-size: 13px;
  }
  .footer-address {
    font-size: 12px;
  }
}

/* ====================================
   Main
   ==================================== */
.l-main {
  min-height: 100vh;
}

:root {
  --spine-primary: #3F51B5;
  --spine-primary-light: #7986CB;
  --spine-primary-dark: #303F9F;
  --spine-lock-01: #283593;
  --spine-lock-01-dark: #1A237E;
  --spine-lock-02: #1565C0;
  --spine-lock-02-dark: #0D47A1;
  --spine-dark: #333333;
  --spine-text: #555555;
  --spine-light-text: #777777;
  --spine-white: #FFFFFF;
  --spine-bg-light: #E8EAF6;
  --spine-bg-gray: #F5F5F5;
  --spine-border: #E0E0E0;
}

/* ====================================
   Base
   ==================================== */
.page-spine {
  color: var(--spine-text);
  line-height: 1.8;
}

.spine-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 30px;
}

@media (max-width: 760px) {
  .spine-container {
    padding: 0 20px;
  }
}

/* ====================================
   Section Title
   ==================================== */
.spine-section-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--spine-dark);
  text-align: center;
  margin-bottom: 50px;
  line-height: 1.5;
}

@media (max-width: 760px) {
  .spine-section-title {
    font-size: 22px;
    margin-bottom: 35px;
  }
}

/* ====================================
   FV
   ==================================== */
.spine-fv {
  position: relative;
  margin-top: 64px;
  background: var(--spine-white);
}

.spine-fv__image {
  width: 100%;
  max-width: 1400px;
  height: auto;
  display: block;
  margin: 0 auto;
}

@media (max-width: 760px) {
  .spine-fv {
    margin-top: 15.3846153846dvw;
  }
  .spine-fv__image {
    max-width: 100%;
  }
}

/* ====================================
   Intro
   ==================================== */
.spine-intro {
  padding: 80px 0;
  background: var(--spine-white);
}

.spine-intro__lead {
  font-size: 18px;
  color: var(--spine-primary-dark);
  text-align: center;
  margin-bottom: 30px;
  font-weight: 500;
}

.spine-intro__content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.spine-intro__text {
  font-size: 17px;
  line-height: 2;
}

.spine-intro__image {
  margin: 20px 0;
}

.spine-intro__image img {
  width: 100%;
  height: auto;
}

.spine-intro__highlight {
  background: var(--spine-primary);
  color: var(--spine-white);
  padding: 25px 30px;
  margin: 20px 0;
}

.spine-intro__highlight p {
  font-size: 17px;
  line-height: 1.8;
  margin: 0;
  font-weight: 500;
}

@media (max-width: 760px) {
  .spine-intro {
    padding: 50px 0;
  }
  .spine-intro__lead {
    font-size: 16px;
  }
  .spine-intro__text {
    font-size: 15px;
  }
  .spine-intro__highlight {
    padding: 20px;
  }
  .spine-intro__highlight p {
    font-size: 15px;
  }
}

/* ====================================
   Points
   ==================================== */
.spine-points {
  padding: 80px 0;
  background: var(--spine-bg-light);
}

.spine-points__list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.spine-points__list > li {
  font-size: 17px;
  line-height: 1.9;
  margin-bottom: 20px;
  padding-left: 30px;
  position: relative;
}

.spine-points__list > li::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 12px;
  width: 8px;
  height: 8px;
  background: var(--spine-primary);
  border-radius: 50%;
}

.spine-points__list > li:last-child {
  margin-bottom: 0;
}

.spine-points__sublist {
  list-style: none;
  padding: 0;
  margin: 10px 0 0 20px;
}

.spine-points__sublist li {
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 8px;
  padding-left: 20px;
  position: relative;
}

.spine-points__sublist li::before {
  content: "・";
  position: absolute;
  left: 0;
  color: var(--spine-primary);
}

@media (max-width: 760px) {
  .spine-points {
    padding: 50px 0;
  }
  .spine-points__list > li {
    font-size: 15px;
  }
  .spine-points__sublist li {
    font-size: 14px;
  }
}

/* ====================================
   Areas Section
   ==================================== */
.spine-areas {
  padding: 80px 0;
  background: var(--spine-white);
}

.spine-areas__image {
  margin-bottom: 50px;
}

.spine-areas__image img {
  width: 100%;
  height: auto;
}

.spine-areas__list {
  display: flex;
  flex-direction: column;
  gap: 25px;
}

.spine-area {
  background: var(--spine-bg-gray);
  padding: 25px 30px;
}

.spine-area__header {
  display: flex;
  align-items: flex-start;
  gap: 15px;
  margin-bottom: 15px;
}

.spine-area__num {
  font-size: 20px;
  font-weight: 700;
  color: var(--spine-primary);
  font-family: "dnp-shuei-gothic-gin-std", sans-serif;
}

.spine-area__title {
  font-size: 18px;
  font-weight: 700;
  color: var(--spine-dark);
  margin: 0;
  line-height: 1.5;
}

.spine-area__text {
  font-size: 15px;
  line-height: 1.9;
  margin: 0;
  padding-left: 35px;
}

@media (max-width: 760px) {
  .spine-areas {
    padding: 50px 0;
  }
  .spine-area {
    padding: 20px;
  }
  .spine-area__title {
    font-size: 16px;
  }
  .spine-area__text {
    font-size: 14px;
    padding-left: 0;
  }
}

/* ====================================
   Signs
   ==================================== */
.spine-signs {
  padding: 80px 0;
  background: var(--spine-bg-gray);
}

.spine-signs__content {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.spine-signs__list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.spine-signs__list li {
  font-size: 17px;
  line-height: 1.9;
  margin-bottom: 20px;
  padding-left: 30px;
  position: relative;
}

.spine-signs__list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--spine-primary);
  font-weight: 700;
}

.spine-signs__list li:last-child {
  margin-bottom: 0;
}

.spine-signs__image img {
  width: 100%;
  height: auto;
}

@media (max-width: 760px) {
  .spine-signs {
    padding: 50px 0;
  }
  .spine-signs__list li {
    font-size: 15px;
  }
}

/* ====================================
   Locks Section
   ==================================== */
.spine-locks {
  padding: 80px 0;
  background: var(--spine-white);
}

.spine-locks__intro {
  font-size: 17px;
  line-height: 2;
  text-align: center;
  margin-bottom: 40px;
}

.spine-locks__image {
  margin: 40px 0;
}

.spine-locks__image img {
  width: 100%;
  height: auto;
}

@media (max-width: 760px) {
  .spine-locks {
    padding: 50px 0;
  }
  .spine-locks__intro {
    font-size: 15px;
    text-align: left;
  }
}

/* ====================================
   Lock Card
   ==================================== */
.spine-lock {
  background: var(--spine-white);
  overflow: hidden;
  margin-bottom: 40px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.spine-lock__header {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 25px 30px;
}

.spine-lock--arthro .spine-lock__header {
  background: linear-gradient(135deg, var(--spine-lock-01) 0%, var(--spine-lock-01-dark) 100%);
}

.spine-lock--neuro .spine-lock__header {
  background: linear-gradient(135deg, var(--spine-lock-02) 0%, var(--spine-lock-02-dark) 100%);
}

.spine-lock__num {
  font-size: 24px;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.4);
  font-family: "dnp-shuei-gothic-gin-std", sans-serif;
}

.spine-lock__titles {
  flex: 1;
}

.spine-lock__title {
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  margin: 0 0 5px;
}

.spine-lock__subtitle {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.85);
  margin: 0;
}

.spine-lock__body {
  padding: 30px;
}

.spine-lock__definition {
  background: var(--spine-bg-gray);
  padding: 20px 25px;
  margin-bottom: 25px;
}

.spine-lock__definition-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--spine-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.spine-lock__definition-text {
  font-size: 16px;
  line-height: 1.8;
  margin: 0;
}

.spine-lock__image {
  margin: 25px 0;
}

.spine-lock__image img {
  width: 100%;
  height: auto;
}

.spine-lock__detail {
  font-size: 16px;
  line-height: 1.9;
  margin-bottom: 25px;
}

.spine-lock__detail p {
  margin: 0 0 15px;
}

.spine-lock__detail p:last-child {
  margin-bottom: 0;
}

.spine-lock__detail ul {
  list-style: none;
  padding: 0;
  margin: 0 0 15px;
}

.spine-lock__detail li {
  font-size: 16px;
  line-height: 1.8;
  margin-bottom: 10px;
  padding-left: 25px;
  position: relative;
}

.spine-lock__detail li::before {
  content: "•";
  position: absolute;
  left: 8px;
  color: var(--spine-primary);
  font-weight: 700;
}

/* Intervention - Solid dark backgrounds for text visibility */
.spine-lock__intervention {
  padding: 20px 25px;
  margin-top: 25px;
}

.spine-lock--arthro .spine-lock__intervention {
  background: var(--spine-lock-01-dark);
}

.spine-lock--neuro .spine-lock__intervention {
  background: var(--spine-lock-02-dark);
}

.spine-lock__intervention-label {
  font-size: 12px;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.9);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.spine-lock__intervention p {
  font-size: 16px;
  line-height: 1.8;
  color: #ffffff;
  margin: 0;
  font-weight: 500;
}

@media (max-width: 760px) {
  .spine-lock__header {
    padding: 20px;
    gap: 15px;
  }
  .spine-lock__num {
    font-size: 20px;
  }
  .spine-lock__title {
    font-size: 18px;
  }
  .spine-lock__subtitle {
    font-size: 13px;
  }
  .spine-lock__body {
    padding: 20px;
  }
  .spine-lock__definition {
    padding: 15px 20px;
  }
  .spine-lock__definition-text {
    font-size: 14px;
  }
  .spine-lock__detail {
    font-size: 14px;
  }
  .spine-lock__detail li {
    font-size: 14px;
  }
  .spine-lock__intervention {
    padding: 15px 20px;
  }
  .spine-lock__intervention p {
    font-size: 14px;
  }
}

/* ====================================
   Locks Relation
   ==================================== */
.spine-locks__relation {
  background: var(--spine-bg-light);
  padding: 30px;
  margin-top: 40px;
}

.spine-locks__relation-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--spine-dark);
  text-align: center;
  margin-bottom: 25px;
}

.spine-locks__relation-image {
  margin-bottom: 25px;
}

.spine-locks__relation-image img {
  width: 100%;
  height: auto;
}

.spine-locks__relation p {
  font-size: 16px;
  line-height: 1.8;
  margin-bottom: 15px;
}

.spine-locks__relation p:last-child {
  margin-bottom: 0;
}

@media (max-width: 760px) {
  .spine-locks__relation {
    padding: 20px;
  }
  .spine-locks__relation-title {
    font-size: 18px;
  }
  .spine-locks__relation p {
    font-size: 14px;
  }
}

/* ====================================
   Comparison Table
   ==================================== */
.spine-comparison {
  padding: 80px 0;
  background: var(--spine-bg-gray);
}

.spine-comparison__table-wrap {
  overflow-x: auto;
}

.spine-comparison__table {
  width: 100%;
  border-collapse: collapse;
  min-width: 600px;
}

.spine-comparison__table th,
.spine-comparison__table td {
  padding: 15px 20px;
  text-align: left;
  border: 1px solid var(--spine-border);
  font-size: 15px;
  line-height: 1.6;
}

.spine-comparison__table thead th {
  background: var(--spine-primary);
  color: #fff;
  font-weight: 700;
  text-align: center;
}

.spine-comparison__table thead th:first-child {
  background: var(--spine-dark);
}

.spine-comparison__table thead th.arthro {
  background: var(--spine-lock-01);
}

.spine-comparison__table thead th.neuro {
  background: var(--spine-lock-02);
}

.spine-comparison__table tbody th {
  background: var(--spine-bg-gray);
  font-weight: 500;
  white-space: nowrap;
}

.spine-comparison__table tbody td {
  background: var(--spine-white);
}

@media (max-width: 760px) {
  .spine-comparison {
    padding: 50px 0;
  }
  .spine-comparison__table th,
  .spine-comparison__table td {
    padding: 12px 15px;
    font-size: 14px;
  }
}

/* ====================================
   Chain Section
   ==================================== */
.spine-chain {
  padding: 80px 0;
  background: var(--spine-white);
}

.spine-chain__image {
  margin-bottom: 40px;
}

.spine-chain__image img {
  width: 100%;
  height: auto;
}

.spine-chain__content p {
  font-size: 16px;
  line-height: 2;
  margin-bottom: 20px;
}

.spine-chain__highlight {
  background: var(--spine-bg-light);
  padding: 25px 30px;
  margin: 30px 0;
  border-left: 4px solid var(--spine-primary);
}

.spine-chain__highlight p {
  font-size: 17px;
  line-height: 1.8;
  margin: 0;
  font-weight: 500;
  color: var(--spine-dark);
}

@media (max-width: 760px) {
  .spine-chain {
    padding: 50px 0;
  }
  .spine-chain__content p {
    font-size: 15px;
  }
  .spine-chain__highlight {
    padding: 20px;
  }
  .spine-chain__highlight p {
    font-size: 15px;
  }
}

/* ====================================
   Method
   ==================================== */
.spine-method {
  padding: 80px 0;
  background: var(--spine-bg-light);
}

.spine-method__image {
  margin-bottom: 50px;
}

.spine-method__image img {
  width: 100%;
  height: auto;
}

.spine-method__steps {
  display: flex;
  flex-direction: column;
  gap: 25px;
}

.spine-method__step {
  background: var(--spine-white);
  padding: 25px 30px;
  display: flex;
  align-items: flex-start;
  gap: 20px;
}

.spine-method__step-num {
  flex: 0 0 45px;
  width: 45px;
  height: 45px;
  background: var(--spine-primary);
  color: #fff;
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.spine-method__step-content {
  flex: 1;
}

.spine-method__step-content h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--spine-dark);
  margin: 0 0 12px;
}

.spine-method__step-content p,
.spine-method__step-content ul {
  font-size: 15px;
  line-height: 1.8;
  margin: 0 0 10px;
}

.spine-method__step-content p:last-child,
.spine-method__step-content ul:last-child {
  margin-bottom: 0;
}

.spine-method__step-content ul {
  padding-left: 20px;
}

.spine-method__step-content li {
  margin-bottom: 8px;
}

.spine-method__step-content li:last-child {
  margin-bottom: 0;
}

.spine-method__note {
  font-size: 14px;
  color: var(--spine-primary-dark);
  background: var(--spine-bg-light);
  padding: 15px 20px;
  margin-top: 15px;
  font-weight: 500;
}

@media (max-width: 760px) {
  .spine-method {
    padding: 50px 0;
  }
  .spine-method__step {
    padding: 20px;
    gap: 15px;
  }
  .spine-method__step-num {
    flex: 0 0 38px;
    width: 38px;
    height: 38px;
    font-size: 18px;
  }
  .spine-method__step-content h3 {
    font-size: 16px;
  }
  .spine-method__step-content p,
  .spine-method__step-content ul {
    font-size: 14px;
  }
  .spine-method__note {
    font-size: 13px;
    padding: 12px 15px;
  }
}

/* ====================================
   Safety Section
   ==================================== */
.spine-safety {
  padding: 80px 0;
  background: var(--spine-white);
}

.spine-safety__image {
  margin-bottom: 40px;
}

.spine-safety__image img {
  width: 100%;
  height: auto;
}

.spine-safety__content p {
  font-size: 16px;
  line-height: 2;
  margin-bottom: 20px;
}

.spine-safety__box {
  background: var(--spine-bg-light);
  padding: 25px 30px;
  margin-top: 30px;
}

.spine-safety__box-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--spine-dark);
  margin-bottom: 15px;
}

.spine-safety__list {
  list-style: none;
  padding: 0;
  margin: 0 0 15px;
}

.spine-safety__list li {
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 10px;
  padding-left: 25px;
  position: relative;
}

.spine-safety__list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--spine-primary);
  font-weight: 700;
}

.spine-safety__box > p:last-child {
  font-size: 15px;
  margin: 0;
}

@media (max-width: 760px) {
  .spine-safety {
    padding: 50px 0;
  }
  .spine-safety__content p {
    font-size: 15px;
  }
  .spine-safety__box {
    padding: 20px;
  }
  .spine-safety__box-title {
    font-size: 16px;
  }
  .spine-safety__list li {
    font-size: 14px;
  }
}

/* ====================================
   FAQ
   ==================================== */
.spine-faq {
  padding: 80px 0;
  background: var(--spine-bg-gray);
}

.spine-faq__list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.spine-faq__item {
  background: var(--spine-white);
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.spine-faq__question {
  display: flex;
  gap: 15px;
  padding: 20px 25px;
  background: var(--spine-bg-light);
  font-weight: 500;
}

.spine-faq__question span {
  flex: 0 0 30px;
  width: 30px;
  height: 30px;
  background: var(--spine-primary);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.spine-faq__question p {
  flex: 1;
  font-size: 16px;
  line-height: 1.6;
  margin: 0;
  color: var(--spine-dark);
}

.spine-faq__answer {
  display: flex;
  gap: 15px;
  padding: 20px 25px;
}

.spine-faq__answer span {
  flex: 0 0 30px;
  width: 30px;
  height: 30px;
  background: var(--spine-bg-gray);
  color: var(--spine-primary);
  font-size: 15px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.spine-faq__answer p {
  flex: 1;
  font-size: 15px;
  line-height: 1.8;
  margin: 0;
}

@media (max-width: 760px) {
  .spine-faq {
    padding: 50px 0;
  }
  .spine-faq__question,
  .spine-faq__answer {
    padding: 15px 20px;
    gap: 12px;
  }
  .spine-faq__question span,
  .spine-faq__answer span {
    flex: 0 0 26px;
    width: 26px;
    height: 26px;
    font-size: 13px;
  }
  .spine-faq__question p {
    font-size: 15px;
  }
  .spine-faq__answer p {
    font-size: 14px;
  }
}

/* ====================================
   Caution
   ==================================== */
.spine-caution {
  padding: 60px 0;
  background: var(--spine-white);
}

.spine-caution__box {
  background: var(--spine-bg-light);
  border: 1px solid var(--spine-primary-light);
  padding: 30px;
}

.spine-caution__title {
  font-size: 18px;
  font-weight: 700;
  color: var(--spine-primary-dark);
  margin: 0 0 15px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.spine-caution__title::before {
  content: "!";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--spine-primary-dark);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  border-radius: 50%;
}

.spine-caution__box > p {
  font-size: 15px;
  line-height: 1.8;
  margin: 0 0 15px;
}

.spine-caution__list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.spine-caution__list li {
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 10px;
  padding-left: 25px;
  position: relative;
}

.spine-caution__list li::before {
  content: "•";
  position: absolute;
  left: 8px;
  color: var(--spine-primary-dark);
  font-weight: 700;
}

.spine-caution__list li:last-child {
  margin-bottom: 0;
}

@media (max-width: 760px) {
  .spine-caution {
    padding: 40px 0;
  }
  .spine-caution__box {
    padding: 20px;
  }
  .spine-caution__title {
    font-size: 16px;
  }
  .spine-caution__box > p,
  .spine-caution__list li {
    font-size: 14px;
  }
}

/* ====================================
   Result
   ==================================== */
.spine-result {
  padding: 60px 0;
  background: var(--spine-bg-gray);
}

.spine-result__image img {
  width: 100%;
  height: auto;
}

@media (max-width: 760px) {
  .spine-result {
    padding: 40px 0;
  }
}

/* ====================================
   References
   ==================================== */
.spine-references {
  padding: 60px 0;
  background: var(--spine-white);
}

.spine-references__list {
  list-style: decimal;
  padding-left: 25px;
  margin: 0;
}

.spine-references__list li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--spine-light-text);
  margin-bottom: 10px;
}

.spine-references__list li:last-child {
  margin-bottom: 0;
}

@media (max-width: 760px) {
  .spine-references {
    padding: 40px 0;
  }
  .spine-references__list li {
    font-size: 13px;
  }
}

/* ====================================
   Back Link
   ==================================== */
.spine-back {
  padding: 60px 0;
  background: var(--spine-bg-gray);
}

.spine-back__link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
  font-size: 16px;
  font-weight: 500;
  color: var(--spine-dark);
  text-decoration: none;
  transition: color 0.3s;
}

.spine-back__link:hover {
  color: var(--spine-primary);
}

.spine-back__arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--spine-border);
  border-radius: 50%;
  transition: all 0.3s;
}

.spine-back__arrow::before {
  content: "";
  width: 8px;
  height: 8px;
  border-left: 2px solid var(--spine-dark);
  border-bottom: 2px solid var(--spine-dark);
  transform: rotate(45deg);
  margin-left: 3px;
  transition: border-color 0.3s;
}

.spine-back__link:hover .spine-back__arrow {
  border-color: var(--spine-primary);
}

.spine-back__link:hover .spine-back__arrow::before {
  border-color: var(--spine-primary);
}

@media (max-width: 760px) {
  .spine-back {
    padding: 40px 0;
  }
  .spine-back__link {
    font-size: 14px;
    gap: 12px;
  }
  .spine-back__arrow {
    width: 35px;
    height: 35px;
  }
}

/* ====================================
   SP Only
   ==================================== */
.sp-only {
  display: none;
}

@media (max-width: 760px) {
  .sp-only {
    display: inline;
  }
}

/* ====================================
   Gift Page Navigation (ページ間導線)
   ==================================== */
.gift-page-nav {
  padding: 80px 40px;
  background: #F5F5F5;
}

.gift-page-nav__container {
  max-width: 1000px;
  margin: 0 auto;
}

.gift-page-nav__title {
  font-size: 20px;
  font-weight: 600;
  text-align: center;
  color: #1E1E1E;
  margin-bottom: 40px;
  letter-spacing: 0.05em;
}

.gift-page-nav__method-label {
  font-size: 14px;
  font-weight: 600;
  color: #888;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.gift-page-nav__methods {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 32px;
}

.gift-page-nav__method-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px 12px;
  background: #fff;
  border-radius: 4px;
  text-decoration: none;
  color: #333;
  border: 2px solid #E0E0E0;
  transition: all 0.3s;
}

.gift-page-nav__method-card:hover {
  border-color: #05A5B9;
  box-shadow: 0 4px 16px rgba(5, 165, 185, 0.15);
  transform: translateY(-2px);
}

.gift-page-nav__method-card.is-current {
  border-color: #05A5B9;
  background: #F0F9FA;
  pointer-events: none;
}

.gift-page-nav__method-letter {
  font-size: 28px;
  font-weight: 700;
  color: #05A5B9;
  line-height: 1;
  margin-bottom: 6px;
}

.gift-page-nav__method-en {
  font-size: 13px;
  font-weight: 600;
  color: #333;
  margin-bottom: 4px;
}

.gift-page-nav__method-jp {
  font-size: 11px;
  color: #888;
}

.gift-page-nav__method-current {
  font-size: 10px;
  color: #05A5B9;
  font-weight: 600;
  margin-top: 6px;
  letter-spacing: 0.05em;
}

.gift-page-nav__divider {
  border: none;
  border-top: 1px solid #ddd;
  margin: 32px 0;
}

.gift-page-nav__approach-label {
  font-size: 14px;
  font-weight: 600;
  color: #888;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.gift-page-nav__approaches {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 32px;
}

.gift-page-nav__approach-card {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px;
  background: #fff;
  border-radius: 4px;
  text-decoration: none;
  color: #333;
  font-size: 14px;
  font-weight: 600;
  border: 2px solid #E0E0E0;
  transition: all 0.3s;
}

.gift-page-nav__approach-card:hover {
  border-color: #05A5B9;
  box-shadow: 0 4px 16px rgba(5, 165, 185, 0.15);
  transform: translateY(-2px);
}

.gift-page-nav__approach-card.is-current {
  border-color: #05A5B9;
  background: #F0F9FA;
  pointer-events: none;
}

.gift-page-nav__approach-arrow {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-top: 2px solid #05A5B9;
  border-right: 2px solid #05A5B9;
  transform: rotate(45deg);
}

.gift-page-nav__approach-card.is-current .gift-page-nav__approach-arrow {
  display: none;
}

.gift-page-nav__approach-current {
  display: none;
  font-size: 10px;
  color: #05A5B9;
  font-weight: 600;
}

.gift-page-nav__approach-card.is-current .gift-page-nav__approach-current {
  display: inline;
}

.gift-page-nav__top-link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px;
  background: #05A5B9;
  color: #fff;
  border-radius: 4px;
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
  transition: background 0.3s;
}

.gift-page-nav__top-link:hover {
  background: #048a9a;
}

.gift-page-nav__top-arrow {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-top: 2px solid #fff;
  border-left: 2px solid #fff;
  transform: rotate(-45deg);
}

@media (max-width: 760px) {
  .gift-page-nav {
    padding: 60px 20px;
  }

  .gift-page-nav__title {
    font-size: 17px;
    margin-bottom: 28px;
  }

  .gift-page-nav__methods {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .gift-page-nav__method-letter {
    font-size: 24px;
  }

  .gift-page-nav__approaches {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .gift-page-nav__top-link {
    font-size: 14px;
    padding: 14px;
  }
}

/* ======================================
   AIO追加スタイル
   ====================================== */

/* ------------------------------------
   パンくずリスト
------------------------------------ */
.spine-breadcrumb {
  max-width: 1000px;
  margin: 0 auto;
  padding: 12px 20px;
  font-size: 13px;
}

.spine-breadcrumb__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.spine-breadcrumb__item + .spine-breadcrumb__item::before {
  content: ">";
  margin-right: 8px;
  color: #999;
}

.spine-breadcrumb__item a {
  color: #2a7f62;
  text-decoration: underline;
}

.spine-breadcrumb__item[aria-current="page"] {
  color: #666;
}

/* ------------------------------------
   h1 ページ見出し
------------------------------------ */
.spine-page-heading {
  max-width: 1000px;
  margin: 0 auto;
  padding: 40px 20px 0;
  text-align: center;
}

.spine-page-heading__title {
  font-size: 28px;
  font-weight: 700;
  color: #333;
  line-height: 1.5;
  letter-spacing: 0.04em;
}

.spine-page-heading__sub {
  display: block;
  font-size: 15px;
  font-weight: 400;
  color: #777;
  margin-top: 8px;
  letter-spacing: 0.02em;
}

@media (max-width: 760px) {
  .spine-page-heading {
    padding: 28px 16px 0;
  }
  .spine-page-heading__title {
    font-size: 22px;
  }
  .spine-page-heading__sub {
    font-size: 13px;
  }
}

/* ------------------------------------
   要約ボックス（Answer First）
------------------------------------ */
.spine-summary {
  padding: 48px 20px;
  background: #f9f9f6;
}

.spine-summary__heading {
  font-size: 22px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 24px;
  color: #333;
}

.spine-summary__box {
  max-width: 860px;
  margin: 0 auto;
  background: #fff;
  border-left: 4px solid #2a7f62;
  padding: 28px;
  border-radius: 0 8px 8px 0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.spine-summary__lead {
  font-size: 15px;
  line-height: 1.9;
  margin-bottom: 14px;
  color: #333;
}

.spine-summary__lead a {
  color: #2a7f62;
  text-decoration: underline;
}

.spine-summary__desc {
  font-size: 14px;
  line-height: 1.9;
  color: #555;
  margin-bottom: 14px;
}

.spine-summary__supervisor {
  font-size: 12px;
  color: #888;
  padding-top: 12px;
  border-top: 1px solid #eee;
}

/* ------------------------------------
   比較テーブル caption（視認可能）
------------------------------------- */
.spine-comparison__table caption {
  caption-side: top;
  text-align: left;
  font-size: 13px;
  color: #666;
  padding: 0 0 8px;
}

/* ------------------------------------
   FAQ（details/summary化）
------------------------------------ */
.spine-faq__item {
  border-bottom: 1px solid #e0e0e0;
}

.spine-faq__item summary {
  cursor: pointer;
  list-style: none;
}

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

.spine-faq__item .spine-faq__answer p a {
  color: #2a7f62;
  text-decoration: underline;
}

/* ------------------------------------
   監修者セクション（E-E-A-T）
------------------------------------ */
.spine-trust {
  padding: 48px 20px;
  background: #f5f5f0;
}

.spine-trust__profile {
  max-width: 800px;
  margin: 24px auto 0;
  padding: 24px;
  background: #fff;
  border-radius: 8px;
}

.spine-trust__name {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
  color: #333;
}

.spine-trust__credential {
  display: inline-block;
  font-size: 13px;
  font-weight: 400;
  color: #2a7f62;
  margin-left: 8px;
}

.spine-trust__role {
  font-size: 14px;
  color: #666;
  margin-bottom: 12px;
}

.spine-trust__desc {
  font-size: 14px;
  line-height: 1.8;
  color: #555;
}

/* ------------------------------------
   関連症状セクション
------------------------------------ */
.spine-related {
  padding: 48px 20px;
  background: #fff;
}

.spine-related__lead {
  text-align: center;
  font-size: 14px;
  color: #555;
  margin-bottom: 24px;
}

.spine-related__list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  max-width: 800px;
  margin: 0 auto;
}

.spine-related__item {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px 12px;
  background: #f9f9f6;
  border: 1px solid #e0e0d8;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  color: #333;
  text-decoration: none;
}

@media (max-width: 760px) {
  .spine-related__list {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ------------------------------------
   免責事項
------------------------------------ */
.spine-disclaimer {
  padding: 20px;
  background: #f5f5f5;
  border-top: 1px solid #e0e0e0;
}

.spine-disclaimer__text {
  max-width: 860px;
  margin: 0 auto;
  font-size: 12px;
  line-height: 1.8;
  color: #888;
}

.spine-disclaimer__supervisor {
  max-width: 860px;
  margin: 6px auto 0;
  font-size: 12px;
  color: #999;
}

/* ------------------------------------
   内部リンク（本文中）
------------------------------------ */
.spine-summary__lead a,
.spine-intro__text a,
.spine-intro__highlight a,
.spine-area__text a,
.spine-lock__detail a,
.spine-lock__intervention a,
.spine-chain__content a,
.spine-method__step-content a,
.spine-safety__content a {
  color: #2a7f62;
  text-decoration: underline;
}

/* ------------------------------------
   戻るリンク
------------------------------------ */
.spine-back {
  padding: 32px 20px;
  text-align: center;
}

.spine-back__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #2a7f62;
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
}

.spine-back__link:hover {
  text-decoration: underline;
}

.spine-back__arrow {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-top: 2px solid #2a7f62;
  border-left: 2px solid #2a7f62;
  transform: rotate(-45deg);
}