/* ========================================
   ion-shower-eco.jp - SK Design System
   ======================================== */

/* CSS Variables */
:root {
  /* Basic 3 Colors */
  --sk-white: #ffffff;
  --sk-black: #000000;
  --good-red: #d1544d;
  --good-red-hover: #b8453f;

  /* Grayscale (補助) */
  --sk-gray-dark: #333333;
  --sk-gray-medium: #666666;
  --sk-gray-light: #999999;
  --sk-gray-border: #e5e5e5;
  --sk-gray-bg: #f5f5f5;

  /* Spacing */
  --sk-space-xs: 0.5rem;    /* 8px */
  --sk-space-sm: 1rem;      /* 16px */
  --sk-space-md: 2rem;      /* 32px */
  --sk-space-lg: 4rem;      /* 64px */
  --sk-space-xl: 8rem;      /* 128px */
}

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

body {
  font-family: 'Helvetica Neue', 'Helvetica', 'Arial', 'Noto Sans JP', sans-serif;
  font-weight: 400;
  line-height: 1.8;
  color: var(--sk-gray-medium);
  background: var(--sk-white);
}

/* Typography */
.sk-heading {
  font-family: 'Helvetica Neue', 'Helvetica', 'Arial', 'Noto Sans JP', sans-serif;
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--sk-black);
}

.sk-subheading {
  font-family: 'Helvetica Neue', 'Helvetica', 'Arial', 'Noto Sans JP', sans-serif;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--sk-black);
}

.sk-body {
  font-family: 'Helvetica Neue', 'Helvetica', 'Arial', 'Noto Sans JP', sans-serif;
  font-weight: 400;
  line-height: 1.8;
  color: var(--sk-gray-medium);
}

/* CTA Buttons */
.btn-cta-red {
  display: inline-block;
  background: var(--good-red);
  color: var(--sk-white);
  padding: 1rem 2rem;
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: background 0.2s;
  border: none;
  cursor: pointer;
}
.btn-cta-red:hover {
  background: var(--good-red-hover);
}

.btn-cta-black {
  display: inline-block;
  background: var(--sk-black);
  color: var(--sk-white);
  padding: 1rem 2rem;
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: background 0.2s;
  border: none;
  cursor: pointer;
}
.btn-cta-black:hover {
  background: var(--sk-gray-dark);
}

.btn-cta-outline {
  display: inline-block;
  background: transparent;
  color: var(--sk-black);
  border: 2px solid var(--sk-black);
  padding: calc(1rem - 2px) calc(2rem - 2px);
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
}
.btn-cta-outline:hover {
  background: var(--sk-black);
  color: var(--sk-white);
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--sk-white);
  z-index: 1000;
  transition: box-shadow 0.3s;
}

.site-header.is-scrolled {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--sk-space-md);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.header-logo a {
  display: flex;
  align-items: center;
  text-decoration: none;
  gap: var(--sk-space-sm);
}

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

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-name {
  font-weight: 900;
  font-size: 1.25rem;
  color: var(--sk-black);
  line-height: 1;
}

.logo-tagline {
  font-size: 0.625rem;
  letter-spacing: 0.15em;
  color: var(--sk-gray-medium);
  margin-top: 2px;
}

.desktop-nav {
  display: none;
  align-items: center;
  gap: var(--sk-space-md);
}

@media (min-width: 768px) {
  .desktop-nav {
    display: flex;
  }
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--sk-black);
  text-decoration: none;
  transition: color 0.2s;
}

.nav-link:hover,
.nav-link.active {
  color: var(--good-red);
}

.header-accent {
  height: 1px;
  background: var(--good-red);
}

/* Mobile Navigation */
.mobile-toggle {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

@media (min-width: 768px) {
  .mobile-toggle {
    display: none;
  }
}

.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--sk-black);
  transition: all 0.3s;
}

.mobile-toggle.is-active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.mobile-toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.mobile-toggle.is-active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.mobile-nav {
  display: none;
  flex-direction: column;
  padding: var(--sk-space-md);
  background: var(--sk-white);
  border-top: 1px solid var(--sk-gray-border);
}

.mobile-nav.is-open {
  display: flex;
}

@media (min-width: 768px) {
  .mobile-nav {
    display: none !important;
  }
}

.mobile-nav-link {
  padding: var(--sk-space-sm) 0;
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--sk-black);
  text-decoration: none;
  border-bottom: 1px solid var(--sk-gray-border);
}

.mobile-nav .btn-cta-red {
  margin-top: var(--sk-space-sm);
  text-align: center;
}

/* Main Content */
main {
  margin-top: 81px;
}

/* Footer */
.site-footer {
  background: var(--sk-black);
  color: var(--sk-white);
  padding: var(--sk-space-xl) 0 var(--sk-space-md);
}

.footer-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--sk-space-md);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sk-space-lg);
  margin-bottom: var(--sk-space-lg);
}

@media (min-width: 768px) {
  .footer-content {
    grid-template-columns: 1fr 2fr;
  }
}

.footer-logo {
  font-size: 1.5rem;
  font-weight: 900;
  margin-bottom: var(--sk-space-sm);
}

.footer-company {
  font-size: 0.875rem;
  margin-bottom: var(--sk-space-md);
  opacity: 0.8;
}

.footer-info {
  font-size: 0.875rem;
  line-height: 1.8;
  opacity: 0.7;
}

.footer-info a {
  color: var(--sk-white);
  text-decoration: none;
}

.footer-info a:hover {
  text-decoration: underline;
}

.footer-nav-columns {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sk-space-md);
}

@media (min-width: 768px) {
  .footer-nav-columns {
    grid-template-columns: repeat(3, 1fr);
  }
}

.footer-nav-title {
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: var(--sk-space-sm);
}

.footer-nav-list {
  list-style: none;
}

.footer-nav-list li {
  margin-bottom: 0.5rem;
}

.footer-nav-list a {
  color: var(--sk-white);
  opacity: 0.7;
  text-decoration: none;
  font-size: 0.875rem;
  transition: opacity 0.2s;
}

.footer-nav-list a:hover {
  opacity: 1;
}

.footer-legal {
  padding-top: var(--sk-space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
}

.footer-legal-links {
  font-size: 0.75rem;
  margin-bottom: var(--sk-space-sm);
}

.footer-legal-links a {
  color: var(--sk-white);
  opacity: 0.7;
  text-decoration: none;
  transition: opacity 0.2s;
}

.footer-legal-links a:hover {
  opacity: 1;
}

.footer-legal-links .separator {
  margin: 0 var(--sk-space-sm);
  opacity: 0.3;
}

.footer-copyright {
  font-size: 0.75rem;
  opacity: 0.5;
}

/* Container */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--sk-space-md);
}

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

@media (max-width: 767px) {
  .section {
    padding: var(--sk-space-lg) 0;
  }
}

/* Red Accent Border */
.red-accent-border {
  border-left: 6px solid var(--good-red);
  padding-left: var(--sk-space-md);
}

/* FAQ */
.faq-question {
  cursor: pointer;
  padding: var(--sk-space-md);
  border-left: 6px solid var(--good-red);
  background: var(--sk-gray-bg);
  margin-bottom: var(--sk-space-sm);
  font-weight: 700;
  color: var(--sk-black);
  transition: background 0.2s;
}

.faq-question:hover {
  background: #eeeeee;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  padding: 0 var(--sk-space-md);
  color: var(--sk-gray-medium);
}

.faq-answer.is-open {
  max-height: 500px;
  padding: var(--sk-space-md);
  margin-bottom: var(--sk-space-sm);
}

/* Product Cards */
.product-card {
  background: var(--sk-white);
  border: 2px solid var(--sk-gray-border);
  padding: var(--sk-space-md);
  position: relative;
}

.product-badge {
  position: absolute;
  top: -1px;
  right: -1px;
  background: var(--good-red);
  color: var(--sk-white);
  padding: 0.5rem 1rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
}

/* Voice Cards */
.voice-card {
  border-left: 6px solid var(--good-red);
  padding: var(--sk-space-md);
  background: var(--sk-white);
  margin-bottom: var(--sk-space-md);
}

.voice-quote {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--sk-gray-dark);
  margin-bottom: var(--sk-space-sm);
}

.voice-attribution {
  font-size: 0.875rem;
  color: var(--sk-gray-light);
}

/* Utility Classes */
.text-center {
  text-align: center;
}

.mb-sm { margin-bottom: var(--sk-space-sm); }
.mb-md { margin-bottom: var(--sk-space-md); }
.mb-lg { margin-bottom: var(--sk-space-lg); }
.mb-xl { margin-bottom: var(--sk-space-xl); }

.mt-sm { margin-top: var(--sk-space-sm); }
.mt-md { margin-top: var(--sk-space-md); }
.mt-lg { margin-top: var(--sk-space-lg); }
.mt-xl { margin-top: var(--sk-space-xl); }