html {
  scroll-behavior: smooth;
}

:root {
  /* Color */
  --color-bg-dark: #14171C;
  --color-bg-light: #FFFFFF;
  --color-bg-light-alt: #F4F6F8;
  --color-accent: #2B67F6;
  --color-accent-hover: #1949CA;
  --color-text-primary: #14171C;
  --color-text-primary-inverse: #FFFFFF;
  --color-text-secondary: #5B6472;
  --color-text-secondary-inverse: rgba(255, 255, 255, 0.72);
  --color-border: #E2E5EA;
  --color-border-inverse: rgba(255, 255, 255, 0.14);

  /* Spacing */
  --max-width: 1160px;
  --space-side-pc: 40px;
  --space-side-tablet: 32px;
  --space-side-sp: 20px;
  --space-section-pc: 120px;
  --space-section-tablet: 88px;
  --space-section-sp: 64px;
  --space-card-gap: 28px;
  --space-side: var(--space-side-sp);
  --space-section: var(--space-section-sp);

  /* Typography */
  --font-jp: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Yu Gothic", "Segoe UI", sans-serif;
  --font-en: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-size-hero: 36px;
  --font-size-hero-sp: 30px;
  --font-size-h2: 34px;
  --font-size-h2-sp: 25px;
  --font-size-h2-emphasis: 40px;
  --font-size-h2-emphasis-sp: 30px;
  --font-size-h3: 20px;
  --font-size-h3-sp: 18px;
  --font-size-body: 16px;
  --font-size-body-sp: 15px;
  --font-size-small: 13px;
  --font-size-small-sp: 12px;
  --font-size-button: 16px;
  --font-size-button-sp: 15px;
  --font-size-eyebrow: 13px;
  --font-size-eyebrow-sp: 12px;

  /* Radius */
  --radius-card: 16px;
  --radius-button: 999px;
  --radius-small: 8px;

  /* Shadow */
  --shadow-card: 0 12px 32px rgba(20, 23, 28, 0.08);
  --shadow-card-hover: 0 16px 40px rgba(20, 23, 28, 0.12);

  /* Transition */
  --transition-base: 0.18s ease;
}

* {
  box-sizing: border-box;
}

html, body {
  max-width: 100%;
  overflow-x: hidden;
}

body {
  margin: 0;
  font-family: var(--font-jp);
  color: var(--color-text-primary);
  background-color: var(--color-bg-light);
  line-height: 1.8;
  font-size: var(--font-size-body);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
}

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

h1, h2, h3 {
  margin: 0;
  line-height: 1.5;
  font-family: var(--font-jp);
}

p {
  margin: 0;
}

button {
  font-family: inherit;
  cursor: pointer;
}

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.section-dark :focus-visible,
.section-final-cta :focus-visible,
.site-footer :focus-visible {
  outline-color: #FFFFFF;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-side);
  width: 100%;
}

.section {
  padding: var(--space-section) 0;
}

.section-light-alt {
  background-color: var(--color-bg-light-alt);
}

.section-dark {
  background-color: var(--color-bg-dark);
}

/* SECTION 03(#approach)のみ上下paddingを縮小(他セクションのpaddingには影響しない) */
#approach.section-dark {
  padding-top: 94px;
  padding-bottom: 94px;
}

@media (min-width: 768px) and (max-width: 1023px) {
  #approach.section-dark {
    padding-top: 69px;
    padding-bottom: 69px;
  }
}

.section-narrow {
  max-width: 720px;
  margin: 0 auto;
  padding-left: var(--space-side);
  padding-right: var(--space-side);
}

.section-narrow-800 {
  max-width: 800px;
  margin: 0 auto;
  padding-left: var(--space-side);
  padding-right: var(--space-side);
  text-align: center;
}

.center {
  text-align: center;
}

.sp-only {
  display: none;
}

/* ============================
   Typography helpers
============================ */

.eyebrow {
  display: block;
  font-family: var(--font-en);
  font-size: var(--font-size-eyebrow-sp);
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 14px;
}

.eyebrow-inverse {
  color: var(--color-text-secondary-inverse);
}

/* section-light-alt(#F4F6F8)背景上のeyebrowのみ、WCAG AA 4.5:1確保のため個別に濃色化(--color-accentは変更しない) */
.section-light-alt .eyebrow {
  color: #2860EA;
}

.section-title {
  font-size: var(--font-size-h2-sp);
  font-weight: 800;
  margin-bottom: 20px;
}

.section-title-inverse {
  color: var(--color-text-primary-inverse);
}

.section-title-emphasis {
  font-size: var(--font-size-h2-emphasis-sp);
}

.section-lead {
  color: var(--color-text-secondary);
  margin-bottom: 32px;
}

.section-body-inverse {
  color: var(--color-text-secondary-inverse);
  margin-bottom: 24px;
}

/* ============================
   Buttons
============================ */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 28px;
  min-height: 52px;
  border-radius: var(--radius-button);
  font-family: var(--font-jp);
  font-size: var(--font-size-button-sp);
  font-weight: 700;
  letter-spacing: 0.02em;
  border: none;
  transition: background-color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base), color var(--transition-base);
  white-space: normal;
  text-align: center;
}

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

.button-primary:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(20, 115, 230, 0.28);
}

.button-primary:active {
  transform: translateY(0);
  box-shadow: none;
}

.button-white {
  background-color: #FFFFFF;
  color: var(--color-accent);
}

.button-white:hover {
  background-color: #EAF1FF;
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.18);
}

.button-large {
  padding: 18px 40px;
  font-size: var(--font-size-button);
}

/* ============================
   Icons
============================ */

.icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--color-accent);
}

.icon-circle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background-color: var(--color-bg-light-alt);
  margin-bottom: 16px;
}

.icon-circle .icon {
  width: 24px;
  height: 24px;
}

.section-dark .icon-circle {
  background-color: rgba(255, 255, 255, 0.08);
}

.section-dark .icon-circle .icon,
.section-dark .icon {
  color: var(--color-text-primary-inverse);
}

/* ============================
   Header
============================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(20, 23, 28, 0.92);
  backdrop-filter: saturate(150%) blur(6px);
  transition: background-color var(--transition-base);
}

.site-header-inner {
  display: flex;
  align-items: center;
  padding: 16px var(--space-side);
}

.brand-mark {
  font-family: var(--font-en);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: #FFFFFF;
  line-height: 1.3;
}

.brand-mark span {
  display: block;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--color-text-secondary-inverse);
}

/* ============================
   Hero(SECTION 01)
============================ */

.hero {
  background-color: var(--color-bg-dark);
  padding: 56px 0 64px;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

.hero-content .eyebrow {
  color: var(--color-accent);
}

.hero-title {
  font-family: var(--font-jp);
  font-size: var(--font-size-hero-sp);
  font-weight: 800;
  color: var(--color-text-primary-inverse);
  letter-spacing: -0.01em;
  line-height: 1.4;
  margin-bottom: 20px;
}

@media (min-width: 1024px) {
  .hero-title-line2 {
    white-space: nowrap;
  }
}

.hero-sub {
  font-size: var(--font-size-body);
  color: var(--color-text-secondary-inverse);
  margin-bottom: 28px;
}

.hero-cta {
  margin-bottom: 24px;
}

.hero-cta-sub {
  margin-top: 12px;
  font-size: var(--font-size-small);
  color: var(--color-text-secondary-inverse);
}

.hero-tags {
  font-family: var(--font-en);
  font-size: var(--font-size-small);
  letter-spacing: 0.04em;
  color: var(--color-text-secondary-inverse);
}

.hero-visual {
  position: relative;
  aspect-ratio: 4 / 5;
  max-width: 420px;
  margin: 0 auto;
  width: 100%;
}

.hero-visual::before {
  content: "";
  position: absolute;
  inset: -24px;
  background: radial-gradient(circle at 72% 28%, rgba(43, 103, 246, 0.38), transparent 62%);
  filter: blur(36px);
  z-index: 0;
}

.hero-visual-img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 70% center;
  border-radius: var(--radius-card);
}

/* ============================
   Grids / Cards
============================ */

.grid {
  display: grid;
  gap: var(--space-card-gap);
}

.grid-3 {
  grid-template-columns: 1fr;
}

.card {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 28px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

.card h3 {
  font-size: var(--font-size-h3-sp);
  font-weight: 700;
  margin-bottom: 10px;
}

.card p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-body-sp);
}

.reason-item h3 {
  font-size: var(--font-size-h3-sp);
  font-weight: 700;
  margin-bottom: 8px;
}

.reason-item p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-body-sp);
}

/* ============================
   Problem card(SECTION 02)
============================ */

.problem-card {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 12px 24px;
  box-shadow: var(--shadow-card);
}

.problem-card li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 0;
  font-size: var(--font-size-body-sp);
}

.problem-card li + li {
  border-top: 1px solid var(--color-border);
}

.problem-card .icon {
  margin-top: 3px;
}

/* ============================
   Benefit(SECTION 06)
============================ */

.benefit-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}

.benefit-visual-img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  object-position: center;
  border-radius: var(--radius-card);
}

.benefit-list {
  margin-top: 20px;
}

.benefit-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 0;
  color: var(--color-text-secondary-inverse);
  font-size: var(--font-size-body-sp);
}

/* ============================
   Usage(SECTION 07)
============================ */

.usage-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}

.usage-visual-img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  object-position: center;
  border-radius: var(--radius-card);
}

.usage-points {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.usage-points li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: var(--font-size-body-sp);
  font-weight: 500;
}

/* ============================
   Counseling(SECTION 08)
============================ */

.counseling-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 32px 0;
}

.counseling-step {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  justify-content: center;
}

.step-number {
  font-family: var(--font-en);
  font-weight: 800;
  color: var(--color-accent);
  font-size: 15px;
}

.counseling-step p {
  font-weight: 700;
}

.counseling-steps.counseling-steps-single {
  grid-template-columns: 1fr;
  max-width: 320px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================
   FAQ(SECTION 09)
============================ */

.faq-item {
  border-bottom: 1px solid var(--color-border);
}

.faq-heading {
  margin: 0;
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 4px;
  background: none;
  border: none;
  text-align: left;
  font-size: var(--font-size-body-sp);
  font-weight: 700;
  color: var(--color-text-primary);
  min-height: 48px;
}

.faq-icon {
  position: relative;
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

.faq-icon::before,
.faq-icon::after {
  content: "";
  position: absolute;
  background-color: var(--color-accent);
  border-radius: 2px;
  transition: transform var(--transition-base);
}

.faq-icon::before {
  top: 50%;
  left: 0;
  width: 100%;
  height: 2px;
  transform: translateY(-50%);
}

.faq-icon::after {
  top: 0;
  left: 50%;
  width: 2px;
  height: 100%;
  transform: translateX(-50%);
}

.faq-question[aria-expanded="true"] .faq-icon::after {
  transform: translateX(-50%) scaleY(0);
}

.faq-answer {
  overflow: hidden;
  transition: max-height 0.25s ease;
}

.faq-answer p {
  padding: 0 4px 20px;
  color: var(--color-text-secondary);
  font-size: var(--font-size-body-sp);
}

/* ============================
   Final CTA(SECTION 10)
============================ */

.section-final-cta {
  padding: var(--space-section-sp) var(--space-side-sp);
  background-color: var(--color-bg-light);
}

.final-cta {
  background: linear-gradient(135deg, var(--color-bg-dark) 0%, #1E2530 60%, var(--color-accent) 160%);
  border-radius: 24px;
  padding: 56px 28px;
  text-align: center;
}

.final-cta .section-title {
  margin-bottom: 16px;
}

.final-cta .section-body-inverse {
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================
   Footer(SECTION 11)
============================ */

.site-footer {
  background-color: var(--color-bg-dark);
  padding: 40px 0;
}

.site-footer-inner {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.brand-mark-footer {
  font-size: 14px;
}

.footer-disclaimer {
  font-size: var(--font-size-small-sp);
  color: var(--color-text-secondary-inverse);
  line-height: 1.7;
  max-width: 560px;
}

/* ============================
   Scroll reveal
============================ */

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .card:hover,
  .button-primary:hover,
  .button-white:hover {
    transform: none;
  }

  .faq-answer {
    transition: none;
  }
}

/* ============================
   Responsive: Tablet (768px - 1023px)
============================ */

@media (min-width: 768px) {
  :root {
    --space-side: var(--space-side-tablet);
    --space-section: var(--space-section-tablet);
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .counseling-steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .section-title {
    font-size: calc(var(--font-size-h2-sp) * 1.15);
  }
}

/* ============================
   Responsive: Desktop (>=1024px)
============================ */

@media (min-width: 1024px) {
  :root {
    --space-side: var(--space-side-pc);
    --space-section: var(--space-section-pc);
  }

  .eyebrow {
    font-size: var(--font-size-eyebrow);
  }

  .section-title {
    font-size: var(--font-size-h2);
  }

  .section-title-emphasis {
    font-size: var(--font-size-h2-emphasis);
  }

  .card h3,
  .reason-item h3 {
    font-size: var(--font-size-h3);
  }

  .card p,
  .reason-item p,
  .problem-card li,
  .usage-points li,
  .faq-question,
  .faq-answer p {
    font-size: var(--font-size-body);
  }

  .button {
    font-size: var(--font-size-button);
  }

  .hero {
    padding: 0;
    min-height: 88vh;
    display: flex;
    align-items: center;
  }

  .hero-inner {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
  }

  .hero-title {
    font-size: var(--font-size-hero);
  }

  .hero-visual {
    max-width: none;
  }

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

  .benefit-inner {
    grid-template-columns: 1fr 1fr;
  }

  .usage-inner {
    grid-template-columns: 1fr 1fr;
  }

  .usage-visual {
    order: 2;
  }

  .counseling-steps {
    grid-template-columns: repeat(2, 1fr);
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
  }

  .final-cta {
    padding: 88px 40px;
  }

  .section-final-cta {
    padding: var(--space-section-pc) var(--space-side-pc);
  }
}

/* ============================
   Mobile-specific crop adjustment
============================ */

@media (max-width: 1023px) {
  .hero-visual-img {
    object-position: 65% 20%;
  }
}

/* ============================
   Responsive: Mobile (<=767px) fine-tuning
============================ */

@media (max-width: 767px) {
  .button-large {
    padding: 14px 22px;
    font-size: var(--font-size-button-sp);
    min-height: 48px;
    box-sizing: border-box;
    justify-content: center;
    max-width: 100%;
    white-space: nowrap;
  }

  .hero-tags {
    font-size: var(--font-size-small-sp);
  }

  /* セクション間の縦余白を実機確認に基づき個別に調整(Hero・CTA・Footerの余白には触れない) */
  #problem {
    padding-top: 52px;
    padding-bottom: 52px;
  }

  #why {
    padding-bottom: 52px;
  }

  #service {
    padding-top: 52px;
  }

  #approach.section-dark {
    padding-top: 73px;
    padding-bottom: 73px;
  }

  .sp-only {
    display: inline;
  }

  .problem-card {
    padding: 12px 16px;
  }

  .problem-card li {
    gap: 8px;
  }

  .nowrap-sp {
    white-space: nowrap;
  }

  #approach .section-body-inverse {
    text-align: left;
  }

  #counseling {
    padding-bottom: 40px;
  }

  #faq {
    padding-top: 40px;
  }

  /* 最終CTA: .section-final-cta と .container の横paddingが二重に加算されていたため解消 */
  .section-final-cta {
    padding-left: 0;
    padding-right: 0;
  }

  .final-cta {
    padding-left: 18px;
    padding-right: 18px;
  }

  .final-cta .button-large {
    width: 100%;
    padding-left: 16px;
    padding-right: 16px;
    font-size: 14px;
  }
}