html {
  scroll-behavior: smooth;
}

:root {
  /* Color */
  --color-bg: #FFFFFF;
  --color-bg-soft: #F5F9FF;
  --color-primary: #245DEB;
  --color-primary-hover: #1D4ABC;
  --color-navy: #14213D;
  --color-accent-orange: #FFB547;
  --color-text: #1E293B;
  --color-text-sub: #5F6F86;
  --color-text-inverse: #FFFFFF;
  --color-text-sub-inverse: rgba(255, 255, 255, 0.76);
  --color-border: #DDE7F3;
  --color-border-inverse: rgba(255, 255, 255, 0.16);

  /* Spacing(モバイルファースト: デフォルトはSP値) */
  --max-width: 1160px;
  --space-side-pc: 40px;
  --space-side-tablet: 32px;
  --space-side-sp: 20px;
  --space-section-pc: 104px;
  --space-section-tablet: 88px;
  --space-section-sp: 72px;
  --space-side: var(--space-side-sp);
  --space-section: var(--space-section-sp);
  --space-card-gap: 24px;

  /* 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-h1-sp: 28px;
  --font-size-h1: 44px;
  --font-size-h2-sp: 26px;
  --font-size-h2: 36px;
  --font-size-h3-sp: 18px;
  --font-size-h3: 22px;
  --font-size-body-sp: 15px;
  --font-size-body: 17px;
  --font-size-small-sp: 12px;
  --font-size-small: 13px;
  --font-size-button-sp: 15px;
  --font-size-button: 16px;
  --font-size-eyebrow-sp: 12px;
  --font-size-eyebrow: 13px;

  /* Radius */
  --radius-card: 20px;
  --radius-button: 999px;
  --radius-small: 8px;

  /* Shadow */
  --shadow-card: 0 8px 24px rgba(20, 33, 61, 0.06);
  --shadow-card-hover: 0 12px 32px rgba(20, 33, 61, 0.1);

  /* 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);
  background-color: var(--color-bg);
  line-height: 1.8;
  font-size: var(--font-size-body-sp);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-primary);
  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-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

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

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

.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: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 14px;
}

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

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

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

.section-lead {
  color: var(--color-text-sub);
  margin-bottom: 28px;
}

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

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 28px;
  min-height: 50px;
  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-primary);
  color: #FFFFFF;
}

.button-primary:hover {
  background-color: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(36, 93, 235, 0.28);
}

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

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

.button-white:hover {
  background-color: #EAF1FF;
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.16);
}

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

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

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

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

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

.section-navy .icon-circle {
  background-color: rgba(255, 255, 255, 0.1);
}

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

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(150%) blur(6px);
  border-bottom: 1px solid var(--color-border);
  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: 0.06em;
  color: var(--color-navy);
  line-height: 1.3;
}

.brand-mark span {
  display: block;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--color-text-sub);
}

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

.hero {
  background-color: var(--color-bg-soft);
  padding: 48px 0 56px;
}

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

.hero-title {
  font-family: var(--font-jp);
  font-size: var(--font-size-h1-sp);
  font-weight: 800;
  color: var(--color-navy);
  letter-spacing: -0.01em;
  line-height: 1.5;
  margin-bottom: 20px;
}

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

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

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

.hero-tags {
  font-family: var(--font-en);
  font-size: var(--font-size-small-sp);
  letter-spacing: 0.03em;
  color: var(--color-text-sub);
}

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

.hero-visual::before {
  content: "";
  position: absolute;
  inset: -20px;
  background: radial-gradient(circle at 28% 24%, rgba(36, 93, 235, 0.16), transparent 62%);
  filter: blur(30px);
  z-index: 0;
}

.hero-visual-img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 20%;
  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-sub);
  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;
}

/* ============================
   Approach(SECTION 03)
============================ */

.approach-visual {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 10px;
  margin: 28px 0;
}

.approach-number {
  font-family: var(--font-en);
  font-size: 72px;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
}

.approach-unit {
  font-family: var(--font-en);
  font-size: var(--font-size-small-sp);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-text-sub);
  text-transform: uppercase;
}

.benefits-cta {
  text-align: center;
  margin-top: 44px;
}

/* ============================
   Service(SECTION 05)
============================ */

.service-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

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

.service-points {
  margin-top: 22px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

/* ============================
   Beginner Support(SECTION 06)
============================ */

.support-list {
  margin-top: 24px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  text-align: left;
}

.support-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: var(--font-size-body-sp);
  color: var(--color-text-sub);
}

/* ============================
   Free Trial(SECTION 07)
============================ */

.free-trial-inner {
  text-align: center;
}

/* ============================
   FAQ(SECTION 08)
============================ */

.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);
  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-primary);
  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-sub);
  font-size: var(--font-size-body-sp);
}

/* ============================
   Final CTA(SECTION 09)
============================ */

.section-final-cta {
  padding: var(--space-section-sp) 0;
  background-color: var(--color-bg);
}

.final-cta {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-navy) 130%);
  border-radius: 24px;
  padding: 48px 24px;
  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 10)
============================ */

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

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

.site-footer .brand-mark {
  color: #FFFFFF;
}

.site-footer .brand-mark span {
  color: var(--color-text-sub-inverse);
}

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

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

.reveal {
  opacity: 0;
  transform: translateY(18px);
  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);
  }

  .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);
  }

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

  .card p,
  .problem-card li,
  .service-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: 82vh;
    display: flex;
    align-items: center;
  }

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

  .hero-title {
    font-size: var(--font-size-h1);
  }

  .hero-title-line1,
  .hero-title-line2 {
    white-space: nowrap;
  }

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

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

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

  .grid-3 > :nth-child(4) {
    grid-column: 2;
  }

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

  .approach-number {
    font-size: 96px;
  }

  .final-cta {
    padding: 72px 40px;
  }
}

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

@media (max-width: 1023px) {
  .hero-visual-img {
    object-position: 55% 15%;
  }
}

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

@media (max-width: 767px) {
  .sp-only {
    display: inline;
  }

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

  .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;
  }

  .final-cta {
    padding: 40px 20px;
  }

  .final-cta .button-large {
    width: 100%;
    padding-left: 20px;
    padding-right: 20px;
  }

  .approach-number {
    font-size: 56px;
  }
}