/* ==========================================================================
   CSS Variables
   ========================================================================== */
:root {
  /* Colors */
  --color-primary: #2C7A7B;
  --color-primary-dark: #1D5A5B;
  --color-primary-light: #E6FFFA;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-bg: #F8F9FA;
  --color-white: #FFFFFF;
  --color-border: #E2E8F0;
  --color-accent: #38B2AC;

  /* Typography */
  --font-family: 'Noto Sans JP', 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Meiryo', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 800px;

  /* Effects */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --transition: 0.3s ease;
}

/* ==========================================================================
   Base Styles
   ========================================================================== */
body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background-color: var(--color-white);
  line-height: 1.8;
}

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

.container--narrow {
  max-width: var(--container-narrow);
}

/* ==========================================================================
   Typography
   ========================================================================== */
h1,
h2,
h3,
h4 {
  font-weight: 700;
  line-height: 1.4;
  color: var(--color-text);
}

h1 {
  font-size: var(--font-size-3xl);
}

h2 {
  font-size: var(--font-size-2xl);
}

h3 {
  font-size: var(--font-size-xl);
}

p {
  margin-bottom: var(--space-sm);
}

/* ==========================================================================
   Components
   ========================================================================== */

/* Section */
.section {
  padding: var(--space-3xl) 0;
}

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

.section__title {
  text-align: center;
  margin-bottom: var(--space-xl);
  font-size: var(--font-size-2xl);
  position: relative;
  padding-bottom: var(--space-md);
}

.section__title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background-color: var(--color-primary);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--font-size-base);
  font-weight: 700;
  text-align: center;
  border-radius: var(--radius-md);
  transition: all var(--transition);
  cursor: pointer;
}

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

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--large {
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-lg);
}

/* CTA Box */
.cta-box {
  text-align: center;
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
}

/* Cards */
.card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-sm);
  color: var(--color-primary);
}

.card__title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.card__text {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
}

/* ==========================================================================
   Header
   ========================================================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
}

.header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.header__logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
}

.header__cta .btn {
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-sm);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-white) 100%);
  padding-top: 70px;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: url('../images/hero-bg.svg') no-repeat center right;
  background-size: contain;
  opacity: 0.3;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 700px;
}

.hero__badge {
  display: inline-block;
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.hero__title {
  font-size: var(--font-size-4xl);
  line-height: 1.3;
  margin-bottom: var(--space-md);
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  margin-bottom: var(--space-xl);
  line-height: 1.8;
}

/* ==========================================================================
   Challenges Section
   ========================================================================== */
.challenges__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.challenges .card {
  border-left: 4px solid var(--color-primary);
}

.challenges .card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background-color: var(--color-primary-light);
  border-radius: 50%;
  margin-bottom: var(--space-md);
}

.challenges .card__icon svg {
  width: 28px;
  height: 28px;
  color: var(--color-primary);
}

/* ==========================================================================
   Solution Section
   ========================================================================== */
.solution__steps {
  display: flex;
  gap: var(--space-lg);
  justify-content: center;
  flex-wrap: wrap;
}

.solution__step {
  flex: 1;
  min-width: 280px;
  max-width: 350px;
  text-align: center;
  padding: var(--space-lg);
}

.solution__number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: var(--font-size-2xl);
  font-weight: 700;
  border-radius: 50%;
  margin: 0 auto var(--space-md);
}

.solution__step-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.solution__step-text {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
}

/* ==========================================================================
   Architecture Section
   ========================================================================== */
.architecture {
  background-color: var(--color-bg);
}

.architecture__image {
  max-width: 900px;
  margin: 0 auto var(--space-lg);
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-md);
}

.architecture__image img {
  width: 100%;
  height: auto;
}

.architecture__caption {
  text-align: center;
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
  max-width: 600px;
  margin: 0 auto;
}

/* ==========================================================================
   Features Section (Data, Automation, AI)
   ========================================================================== */
.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.feature {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.feature__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 80px;
  height: 80px;
  background-color: var(--color-primary-light);
  border-radius: 50%;
  margin: 0 auto var(--space-md);
}

.feature__icon svg {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
}

.feature__title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
  color: var(--color-primary);
}

.feature__text {
  color: var(--color-text-light);
  line-height: 1.8;
}

.feature__note {
  margin-top: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  font-style: italic;
}

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

.comparison__table {
  width: 100%;
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.comparison__table th,
.comparison__table td {
  padding: var(--space-md) var(--space-lg);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.comparison__table th {
  background-color: var(--color-primary);
  color: var(--color-white);
  font-weight: 700;
}

.comparison__table th:first-child {
  background-color: var(--color-bg);
  color: var(--color-text);
}

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

.comparison__table tr:nth-child(even) {
  background-color: var(--color-bg);
}

.comparison__table td:first-child {
  font-weight: 700;
  color: var(--color-text);
}

.comparison__table td:last-child {
  color: var(--color-primary);
  font-weight: 700;
}

/* ==========================================================================
   Service Section
   ========================================================================== */
.service__card {
  max-width: 700px;
  margin: 0 auto;
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-lg);
  border: 2px solid var(--color-primary);
}

.service__badge {
  display: inline-block;
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.service__title {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-md);
}

.service__meta {
  display: flex;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.service__meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.service__meta-label {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
}

.service__meta-value {
  font-weight: 700;
  color: var(--color-primary);
}

.service__deliverables-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.service__deliverables {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
}

.service__deliverable {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-size-sm);
}

.service__deliverable::before {
  content: '';
  display: block;
  width: 8px;
  height: 8px;
  background-color: var(--color-primary);
  border-radius: 50%;
}

/* ==========================================================================
   Flow Section
   ========================================================================== */
.flow {
  background-color: var(--color-bg);
}

.flow__timeline {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
  position: relative;
}

.flow__step {
  flex: 1;
  min-width: 220px;
  max-width: 260px;
  text-align: center;
  position: relative;
}

.flow__step:not(:last-child)::after {
  content: '';
  position: absolute;
  top: 35px;
  right: -30px;
  width: 30px;
  height: 2px;
  background-color: var(--color-primary);
}

.flow__number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 70px;
  height: 70px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: var(--font-size-2xl);
  font-weight: 700;
  border-radius: 50%;
  margin: 0 auto var(--space-md);
}

.flow__step-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.flow__step-text {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
}

/* ==========================================================================
   Target Section
   ========================================================================== */
.target__list {
  max-width: 700px;
  margin: 0 auto;
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
}

.target__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
}

.target__item:last-child {
  border-bottom: none;
}

.target__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  color: var(--color-primary);
}

.target__text {
  font-size: var(--font-size-base);
}

/* ==========================================================================
   FAQ Section
   ========================================================================== */
.faq {
  background-color: var(--color-bg);
}

.faq__list {
  max-width: 800px;
  margin: 0 auto;
}

.faq__item {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-sm);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.faq__question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) var(--space-lg);
  font-size: var(--font-size-base);
  font-weight: 700;
  text-align: left;
  cursor: pointer;
  transition: background-color var(--transition);
}

.faq__question:hover {
  background-color: var(--color-primary-light);
}

.faq__item[open] .faq__question {
  background-color: var(--color-primary-light);
}

.faq__icon {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
  transition: transform var(--transition);
}

.faq__item[open] .faq__icon {
  transform: rotate(180deg);
}

.faq__answer {
  padding: 0 var(--space-lg) var(--space-md);
  color: var(--color-text-light);
  line-height: 1.8;
}

/* ==========================================================================
   Contact Section
   ========================================================================== */
.contact {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
}

.contact .section__title {
  color: var(--color-white);
}

.contact .section__title::after {
  background-color: var(--color-white);
}

.contact__lead {
  text-align: center;
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-xl);
  opacity: 0.9;
}

.contact__form {
  max-width: 600px;
  margin: 0 auto;
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-lg);
}

.form__group {
  margin-bottom: var(--space-md);
}

.form__label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.form__required {
  color: #E53E3E;
  margin-left: var(--space-xs);
}

.form__input,
.form__textarea {
  width: 100%;
  padding: var(--space-sm);
  font-size: var(--font-size-base);
  color: var(--color-text);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition);
}

.form__input:focus,
.form__textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.form__textarea {
  min-height: 120px;
  resize: vertical;
}

.form__privacy {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.form__privacy input[type="checkbox"] {
  margin-top: 4px;
  width: 18px;
  height: 18px;
  accent-color: var(--color-primary);
}

.form__privacy-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

.form__privacy-text a {
  color: var(--color-primary);
  text-decoration: underline;
}

.form__submit {
  width: 100%;
}

/* Honeypot - hidden from users */
.form__honeypot {
  position: absolute;
  left: -9999px;
  top: -9999px;
  opacity: 0;
  height: 0;
  width: 0;
  overflow: hidden;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  background-color: var(--color-text);
  color: var(--color-white);
  padding: var(--space-xl) 0;
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer__company {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.footer__logo {
  font-size: var(--font-size-lg);
  font-weight: 700;
}

.footer__info {
  font-size: var(--font-size-sm);
  opacity: 0.7;
  line-height: 1.6;
}

.footer__info p {
  margin-bottom: 0;
}

.footer__links {
  display: flex;
  gap: var(--space-lg);
}

.footer__link {
  font-size: var(--font-size-sm);
  opacity: 0.8;
  transition: opacity var(--transition);
}

.footer__link:hover {
  opacity: 1;
}

.footer__copyright {
  width: 100%;
  text-align: center;
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  font-size: var(--font-size-sm);
  opacity: 0.6;
}

/* ==========================================================================
   Responsive Styles
   ========================================================================== */

/* Tablet */
@media (max-width: 1023px) {
  :root {
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.5rem;
    --font-size-2xl: 1.25rem;
  }

  .hero {
    min-height: auto;
    padding: calc(70px + var(--space-3xl)) 0 var(--space-3xl);
  }

  .hero::before {
    opacity: 0.15;
    width: 100%;
  }

  .features__grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .feature {
    padding: var(--space-lg);
  }

  .flow__step:not(:last-child)::after {
    display: none;
  }

  .service__meta {
    flex-direction: column;
    gap: var(--space-sm);
  }

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

/* Mobile */
@media (max-width: 767px) {
  :root {
    --font-size-4xl: 1.75rem;
    --font-size-3xl: 1.375rem;
    --font-size-2xl: 1.125rem;
    --space-3xl: 4rem;
    --space-2xl: 3rem;
    --space-xl: 2rem;
  }

  .header__inner {
    height: 60px;
  }

  .header__logo {
    font-size: var(--font-size-base);
  }

  .hero {
    padding-top: calc(60px + var(--space-2xl));
    text-align: center;
  }

  .hero__content {
    max-width: 100%;
  }

  .btn--large {
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--font-size-base);
  }

  .solution__steps {
    flex-direction: column;
    align-items: center;
  }

  .solution__step {
    max-width: 100%;
  }

  .comparison__table th,
  .comparison__table td {
    padding: var(--space-sm);
    font-size: var(--font-size-sm);
  }

  .flow__timeline {
    flex-direction: column;
    align-items: center;
  }

  .flow__step {
    max-width: 100%;
  }

  .contact__form {
    padding: var(--space-lg);
  }

  .footer__inner {
    flex-direction: column;
    text-align: center;
  }

  .footer__links {
    flex-direction: column;
    gap: var(--space-sm);
  }
}