/* ========================================
   Reset & Base
   ======================================== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --blue: #2E5BFF;
  --blue-light: #EEF2FF;
  --blue-dark: #1a3aad;
  --black: #1A1A1A;
  --gray-text: #555;
  --gray-light: #F5F5F5;
  --gray-border: #E0E0E0;
  --white: #FFFFFF;
  --dark: #1A1A1A;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 2px 16px rgba(0,0,0,0.06);
  --shadow-hover: 0 8px 32px rgba(0,0,0,0.1);
  --transition: 0.3s ease;
  --max-width: 1120px;
}

html {
  scroll-behavior: smooth;
  font-size: 18px;
}

body {
  font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--black);
  line-height: 1.8;
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }

/* ========================================
   Scroll Animation
   ======================================== */
.problem__card,
.features__card,
.flow__step,
.cycle__step,
.faq__item {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

/* Fallback: ensure visibility even without JS */
@media (prefers-reduced-motion: reduce) {
  .problem__card,
  .features__card,
  .flow__step,
  .cycle__step,
  .faq__item {
    opacity: 1;
    transform: none;
  }
}

.problem__card.is-visible,
.features__card.is-visible,
.flow__step.is-visible,
.cycle__step.is-visible,
.faq__item.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.problem__card:nth-child(2),
.features__card:nth-child(2),
.faq__item:nth-child(2) { transition-delay: 0.1s; }
.problem__card:nth-child(3),
.features__card:nth-child(3),
.faq__item:nth-child(3) { transition-delay: 0.2s; }
.problem__card:nth-child(4),
.features__card:nth-child(4),
.faq__item:nth-child(4) { transition-delay: 0.3s; }
.faq__item:nth-child(5) { transition-delay: 0.4s; }

/* ========================================
   Header
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,0,0,0.05);
}

.header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 40px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.header__logo-text {
  font-family: 'Lato', sans-serif;
  font-weight: 900;
  font-size: 1.25rem;
  color: var(--black);
  letter-spacing: 0.05em;
}

.header__nav {
  display: flex;
  gap: 32px;
}

.header__nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gray-text);
  transition: color var(--transition);
}

.header__nav a:hover {
  color: var(--blue);
}

.header__cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  background: var(--blue);
  color: var(--white);
  font-size: 0.875rem;
  font-weight: 700;
  border-radius: 100px;
  transition: background var(--transition), transform var(--transition);
}

.header__cta-btn:hover {
  background: var(--blue-dark);
  transform: translateY(-1px);
}

.header__menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.header__menu-btn span {
  width: 24px;
  height: 2px;
  background: var(--black);
  transition: var(--transition);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 0.9375rem;
  font-weight: 700;
  border-radius: 100px;
  transition: all var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
}

.btn--primary {
  background: var(--blue);
  color: var(--white);
  border-color: var(--blue);
}

.btn--primary:hover {
  background: var(--blue-dark);
  border-color: var(--blue-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(46,91,255,0.3);
}

.btn--outline {
  background: transparent;
  color: var(--blue);
  border-color: var(--blue);
}

.btn--outline:hover {
  background: var(--blue);
  color: var(--white);
  transform: translateY(-2px);
}

.btn--white {
  background: var(--white);
  color: var(--blue);
  border-color: var(--white);
}

.btn--white:hover {
  background: transparent;
  color: var(--white);
  border-color: var(--white);
  transform: translateY(-2px);
}

.btn--large {
  padding: 18px 40px;
  font-size: 1rem;
}

/* ========================================
   Hero
   ======================================== */
.hero {
  padding: 130px 40px 70px;
  background: var(--white);
  overflow: hidden;
}

.hero__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero__label {
  font-family: 'Lato', sans-serif;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--blue);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.hero__title {
  font-size: 2.5rem;
  font-weight: 900;
  line-height: 1.4;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.hero__desc {
  font-size: 1rem;
  color: var(--gray-text);
  line-height: 1.9;
  margin-bottom: 32px;
}

.hero__buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero__image {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

/* ========================================
   Section Common
   ======================================== */
.section {
  padding: 72px 40px;
}

.section--gray {
  background: var(--gray-light);
}

.section__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section__header {
  text-align: center;
  margin-bottom: 40px;
}

.section__label {
  display: inline-block;
  font-family: 'Lato', sans-serif;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--blue);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.section__label::after {
  content: '';
  display: block;
  width: 40px;
  height: 3px;
  background: var(--blue);
  margin: 8px auto 0;
  border-radius: 2px;
}

.section__title {
  font-size: 1.75rem;
  font-weight: 900;
  line-height: 1.5;
  margin-top: 12px;
  letter-spacing: -0.01em;
}

.section__lead {
  margin-top: 12px;
  font-size: 0.9375rem;
  color: var(--gray-text);
  line-height: 1.8;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

/* ========================================
   Problem
   ======================================== */
.problem__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.problem__card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  border: 1px solid transparent;
}

.problem__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--blue-light);
}

.problem__num {
  font-family: 'Lato', sans-serif;
  font-size: 2rem;
  font-weight: 900;
  color: var(--blue);
  opacity: 0.2;
  margin-bottom: 12px;
  line-height: 1;
}

.problem__card-title {
  font-size: 1.25rem;
  font-weight: 900;
  margin-bottom: 12px;
  color: var(--black);
  line-height: 1.4;
}

.problem__card-desc {
  font-size: 0.9375rem;
  color: #444;
  line-height: 1.9;
}

/* ========================================
   PDCA Cycle
   ======================================== */
.cycle {
  padding-top: 72px;
}

.cycle__diagram {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  grid-template-rows: auto auto auto auto auto;
  gap: 0;
  align-items: center;
  justify-items: center;
  max-width: 880px;
  margin: 0 auto;
  position: relative;
}

.cycle__center {
  grid-column: 2;
  grid-row: 3;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: var(--blue);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--white);
  z-index: 2;
  box-shadow: 0 4px 24px rgba(46,91,255,0.3);
}

.cycle__center-text {
  font-family: 'Lato', sans-serif;
  font-weight: 900;
  font-size: 1.25rem;
  line-height: 1.3;
}

.cycle__center-text small {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  display: block;
  margin-top: 2px;
  opacity: 0.9;
}

.cycle__step {
  background: var(--white);
  border: 2px solid var(--blue);
  border-radius: var(--radius);
  padding: 28px 24px;
  width: 100%;
  max-width: 340px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.cycle__step:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(46,91,255,0.12);
}

.cycle__step--collect { grid-column: 1; grid-row: 1; }
.cycle__step--analyze { grid-column: 3; grid-row: 1; }
.cycle__step--execute { grid-column: 3; grid-row: 5; }
.cycle__step--improve { grid-column: 1; grid-row: 5; }

.cycle__arrow--1 { grid-column: 2; grid-row: 1; }
.cycle__arrow--2 { grid-column: 3; grid-row: 3; }
.cycle__arrow--3 { grid-column: 2; grid-row: 5; }
.cycle__arrow--4 { grid-column: 1; grid-row: 3; }

.cycle__step-num {
  font-family: 'Lato', sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--blue);
  letter-spacing: 0.1em;
  margin-bottom: 4px;
  opacity: 0.6;
}

.cycle__step-title {
  font-family: 'Lato', sans-serif;
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--blue);
  margin-bottom: 2px;
}

.cycle__step-subtitle {
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.cycle__step-desc {
  font-size: 0.8125rem;
  color: var(--gray-text);
  line-height: 1.8;
}

.cycle__note {
  text-align: center;
  margin-top: 32px;
  font-size: 0.9375rem;
  color: var(--gray-text);
  line-height: 1.9;
}

/* ========================================
   Features
   ======================================== */
.features__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.features__card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 36px 24px;
  box-shadow: var(--shadow);
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
  border: 1px solid transparent;
}

.features__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--blue-light);
}

.features__icon-wrap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: var(--blue-light);
  margin-bottom: 20px;
}

.features__icon {
  margin-bottom: 20px;
}

.features__card-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.5;
}

.features__card-desc {
  font-size: 0.8125rem;
  color: var(--gray-text);
  line-height: 1.8;
}

/* ========================================
   Comparison
   ======================================== */
.comparison__table-wrap {
  overflow-x: auto;
}

.comparison__table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.comparison__table th,
.comparison__table td {
  padding: 18px 24px;
  text-align: left;
  font-size: 0.9375rem;
  border-bottom: 1px solid var(--gray-border);
}

.comparison__th-item {
  background: var(--white);
  font-weight: 700;
  width: 20%;
}

.comparison__th-before {
  background: #f0f0f0;
  font-weight: 700;
  color: var(--gray-text);
  width: 40%;
}

.comparison__th-after {
  background: var(--blue);
  font-weight: 700;
  color: var(--white);
  width: 40%;
}

.comparison__th-before span,
.comparison__th-after span {
  display: block;
  font-size: 0.75rem;
  font-weight: 400;
  margin-top: 2px;
  opacity: 0.8;
}

.comparison__item {
  background: var(--white);
  font-weight: 700;
  font-size: 0.875rem;
}

.comparison__before {
  background: #fafafa;
  color: var(--gray-text);
}

.comparison__after {
  background: var(--blue-light);
  color: var(--blue-dark);
  font-weight: 500;
}

.comparison__table tr:last-child td {
  border-bottom: none;
}

/* ========================================
   Flow
   ======================================== */
.flow__steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
}

.flow__step {
  flex: 1;
  max-width: 300px;
  background: var(--white);
  border-radius: var(--radius);
  padding: 36px 28px;
  box-shadow: var(--shadow);
  border: 1px solid transparent;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.flow__num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--blue);
  color: var(--white);
  font-family: 'Lato', sans-serif;
  font-size: 1.25rem;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.flow__step-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.flow__step-desc {
  font-size: 0.8125rem;
  color: var(--gray-text);
  line-height: 1.8;
}

.flow__connector {
  display: flex;
  align-items: center;
  padding: 0 8px;
  margin-top: 40px;
}

/* ========================================
   FAQ
   ======================================== */
.faq__list {
  max-width: 720px;
  margin: 0 auto;
}

.faq__item {
  background: var(--white);
  border-radius: var(--radius);
  margin-bottom: 12px;
  border: 1px solid var(--gray-border);
}

.faq__item:first-child {
  border-top: 1px solid var(--gray-border);
}

.faq__question {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding: 20px 24px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
  transition: color var(--transition);
  text-align: left;
}

.faq__question::-webkit-details-marker {
  display: none;
}

.faq__question::before {
  content: 'Q.';
  font-family: 'Lato', sans-serif;
  font-weight: 900;
  color: var(--blue);
  margin-right: 12px;
  flex-shrink: 0;
}

.faq__question::after {
  content: '+';
  font-family: 'Lato', sans-serif;
  font-size: 1.5rem;
  color: var(--blue);
  margin-left: auto;
  padding-left: 16px;
  flex-shrink: 0;
  transition: transform var(--transition);
}

details[open] .faq__question::after {
  transform: rotate(45deg);
}

.faq__question:hover {
  color: var(--blue);
}

.faq__answer {
  padding: 0 24px 20px 56px;
  font-size: 0.9375rem;
  color: var(--gray-text);
  line-height: 1.9;
}

/* ========================================
   Solution Image
   ======================================== */
.solution__image {
  margin-top: 32px;
  text-align: center;
}

.solution__placeholder {
  max-width: 720px;
  margin: 0 auto;
  height: 280px;
  background: var(--white);
  border: 2px dashed var(--gray-border);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #bbb;
  font-size: 0.875rem;
}

.solution__img {
  max-width: 720px;
  width: 100%;
  border-radius: var(--radius-lg);
}

/* ========================================
   Contact Form
   ======================================== */
.contact {
  background: var(--white);
}

.contact__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.contact__form-wrap {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow);
}

.contact__form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact__form-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.contact__label {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--black);
}

.contact__required {
  font-size: 0.6875rem;
  color: var(--white);
  background: #E53E3E;
  padding: 1px 6px;
  border-radius: 3px;
  margin-left: 6px;
  font-weight: 700;
}

.contact__input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--gray-border);
  border-radius: 8px;
  font-size: 0.9375rem;
  font-family: inherit;
  background: var(--white);
  transition: border-color var(--transition);
  outline: none;
}

.contact__input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(46,91,255,0.1);
}

.contact__select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%23666' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}

.contact__textarea {
  resize: vertical;
  min-height: 100px;
}

.contact__radio-group {
  display: flex;
  gap: 16px;
}

.contact__radio {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  padding: 12px 20px;
  border: 2px solid var(--gray-border);
  border-radius: 8px;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: all var(--transition);
  flex: 1;
}

.contact__radio:has(input:checked) {
  border-color: var(--blue);
  background: var(--blue-light);
}

.contact__radio input {
  accent-color: var(--blue);
  width: 18px;
  height: 18px;
}

.contact__consent {
  text-align: center;
}
.contact__checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  cursor: pointer;
}
.contact__checkbox-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  cursor: pointer;
}
.contact__checkbox-label a {
  color: #2563EB;
  text-decoration: underline;
  font-weight: 500;
}
.contact__checkbox-label a:hover {
  opacity: 0.7;
}

.contact__submit {
  width: 100%;
  margin-top: 8px;
  border: none;
  font-family: inherit;
}

.contact__submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.contact__success {
  text-align: center;
  padding: 60px 20px;
}

.contact__success-title {
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--blue);
  margin-bottom: 12px;
}

.contact__success-desc {
  font-size: 0.9375rem;
  color: var(--gray-text);
  line-height: 1.9;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background: var(--dark);
  color: rgba(255,255,255,0.7);
  padding: 48px 40px 20px;
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer__tagline {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1.6;
  margin-bottom: 20px;
}

.footer__company {
  font-weight: 700;
  margin-bottom: 8px;
}

.footer__company a {
  color: var(--white);
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: opacity var(--transition);
}

.footer__company a:hover {
  opacity: 0.7;
}

.footer__address {
  font-size: 0.8125rem;
  line-height: 1.8;
}

.footer__nav {
  display: flex;
  flex-direction: column;
  gap: 16px;
  justify-content: flex-start;
  align-items: flex-end;
}

.footer__nav a {
  font-size: 0.875rem;
  transition: color var(--transition);
}

.footer__nav a:hover {
  color: var(--white);
}

.footer__bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: 24px;
  text-align: center;
  font-size: 0.75rem;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 1024px) {
  .features__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .header__nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 24px 40px;
    gap: 20px;
    border-bottom: 1px solid var(--gray-border);
    box-shadow: var(--shadow);
  }

  .header__nav.is-open {
    display: flex;
  }

  .header__cta-btn {
    display: none;
  }

  .header__menu-btn {
    display: flex;
  }

  .hero {
    padding: 120px 24px 60px;
  }

  .hero__inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero__title {
    font-size: 1.75rem;
  }

  .hero__desc br {
    display: none;
  }

  .section {
    padding: 64px 24px;
  }

  .section__title {
    font-size: 1.5rem;
  }

  .section__title br,
  .section__lead br,
  .cta__title br,
  .cta__desc br,
  .cycle__note br {
    display: none;
  }

  .problem__grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .cycle__diagram {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
    gap: 16px;
  }

  .cycle__step--collect,
  .cycle__step--analyze,
  .cycle__step--execute,
  .cycle__step--improve {
    grid-column: 1;
    grid-row: auto;
    max-width: 100%;
  }

  .cycle__center {
    grid-column: 1;
    grid-row: auto;
    width: 100px;
    height: 100px;
    margin: 8px auto;
  }

  .cycle__center-text {
    font-size: 1rem;
  }

  .cycle__arrow {
    display: none;
  }

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

  .flow__steps {
    flex-direction: column;
    align-items: center;
    gap: 16px;
  }

  .flow__connector {
    transform: rotate(90deg);
    margin-top: 0;
  }

  .flow__step {
    max-width: 100%;
  }

  .comparison__table th,
  .comparison__table td {
    padding: 12px 16px;
    font-size: 0.8125rem;
  }

  .footer__inner {
    padding-bottom: 32px;
  }

  .solution__placeholder {
    height: 200px;
  }

  .contact__radio-group {
    flex-direction: column;
    gap: 8px;
  }

  .contact__layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .contact__form-wrap {
    padding: 24px;
  }
}