/*
Theme Name: AirEco LP Theme
Theme URI: https://example.com/aireco
Author: Your Company
Author URI: https://example.com
Description: 業務用エアコン省エネフィルター「エアエコ」のランディングページ用WordPressテーマ
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: aireco
*/

/* ===== CSS Variables ===== */
:root {
  --primary: #0d9488;
  --primary-dark: #0f766e;
  --primary-light: #14b8a6;
  --secondary: #1e40af;
  --secondary-dark: #1e3a8a;
  --accent: #f59e0b;
  --background: #ffffff;
  --foreground: #0f172a;
  --muted: #f1f5f9;
  --muted-foreground: #64748b;
  --card: #ffffff;
  --card-foreground: #0f172a;
  --border: #e2e8f0;
  --ring: #0d9488;
  --radius: 0.5rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--foreground);
  background-color: var(--background);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

/* ===== Utilities ===== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.section {
  padding: 5rem 0;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--muted-foreground);
  text-align: center;
  margin-bottom: 3rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  font-size: 1.125rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent) 0%, #d97706 100%);
  color: white;
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.5);
}

.btn-outline {
  background: transparent;
  color: white;
  border: 2px solid white;
}

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

.text-gradient {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
}

.logo span {
  color: var(--primary);
}

.logo img {
  height: 45px;
  width: auto;
  display: block;
}

.header-nav {
  display: none;
}

.header-nav ul {
  display: flex;
  gap: 2rem;
}

.header-nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted-foreground);
  transition: color 0.3s;
}

.header-nav a:hover {
  color: var(--primary);
}

.header-cta {
  display: none;
}

.header-cta .btn {
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem;
}

@media (min-width: 768px) {
  .header-nav,
  .header-cta {
    display: block;
  }
}

/* ===== Hero Section ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #0f766e 0%, #1e40af 100%);
  color: white;
  overflow: hidden;
  padding-top: 70px;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-inner {
  display: grid;
  gap: 3rem;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

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

.hero-description {
  font-size: 1.125rem;
  opacity: 0.9;
  margin-bottom: 2rem;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  font-size: 0.875rem;
  opacity: 0.8;
}

.hero-image {
  display: none;
}

.hero-image-wrapper {
  position: relative;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 1rem;
  padding: 2rem;
  backdrop-filter: blur(10px);
}

.hero-image img {
  border-radius: 0.5rem;
}

.hero-image-badge {
  position: absolute;
  bottom: 1rem;
  right: 1rem;
  background: white;
  color: var(--primary);
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  font-weight: 600;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 3.5rem;
  }

  .hero-buttons {
    flex-direction: row;
  }

  .hero-image {
    display: block;
  }

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

@media (min-width: 1024px) {
  .hero-title {
    font-size: 4rem;
  }
}

/* ===== Problem Section ===== */
.problem {
  background: var(--muted);
}

.problem-grid {
  display: grid;
  gap: 1.5rem;
}

.problem-card {
  background: white;
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.problem-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: #fef2f2;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ef4444;
}

.problem-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.problem-text {
  font-size: 0.875rem;
  color: var(--muted-foreground);
}

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

@media (min-width: 1024px) {
  .problem-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ===== Solution Section ===== */
.solution-header {
  text-align: center;
  margin-bottom: 4rem;
}

.solution-badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: white;
  padding: 0.5rem 1.5rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.solution-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.solution-content {
  display: grid;
  gap: 3rem;
  align-items: center;
}

.solution-image {
  position: relative;
}

.solution-image-wrapper {
  position: relative;
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.solution-image-badge {
  position: absolute;
  top: 1rem;
  left: 1rem;
  background: var(--primary);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 600;
}

.solution-features {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.feature-card {
  display: flex;
  gap: 1rem;
  padding: 1.5rem;
  background: var(--muted);
  border-radius: var(--radius);
  transition: all 0.3s;
}

.feature-card:hover {
  background: white;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

.feature-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.feature-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.feature-text {
  font-size: 0.875rem;
  color: var(--muted-foreground);
}

@media (min-width: 1024px) {
  .solution-content {
    grid-template-columns: 1fr 1fr;
  }
}

/* ===== Benefits Section ===== */
.benefits {
  background: linear-gradient(135deg, #0f766e 0%, #1e40af 100%);
  color: white;
}

.benefits .section-title,
.benefits .section-subtitle {
  color: white;
}

.benefits .section-subtitle {
  opacity: 0.9;
}

.benefits-grid {
  display: grid;
  gap: 1.5rem;
}

.benefit-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all 0.3s;
}

.benefit-card:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-4px);
}

.benefit-icon {
  width: 64px;
  height: 64px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  color: var(--accent);
}

.benefit-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.benefit-text {
  font-size: 0.875rem;
  opacity: 0.9;
}

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

@media (min-width: 1024px) {
  .benefits-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ===== Case Studies Section ===== */
.case-studies {
  background: var(--muted);
}

.case-grid {
  display: grid;
  gap: 2rem;
}

.case-card {
  background: white;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  transition: all 0.3s;
}

.case-card:hover {
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
  transform: translateY(-4px);
}

.case-image {
  position: relative;
  height: 200px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.case-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.case-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: var(--accent);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.case-content {
  padding: 1.5rem;
}

.case-category {
  display: inline-block;
  background: var(--muted);
  color: var(--primary);
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.case-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.case-result {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.case-text {
  font-size: 0.875rem;
  color: var(--muted-foreground);
}

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

@media (min-width: 1024px) {
  .case-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== Effect Section ===== */
.effect-content {
  display: grid;
  gap: 3rem;
  align-items: center;
}

.effect-visual {
  position: relative;
}

.effect-card {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  border-radius: 1rem;
  padding: 3rem 2rem;
  color: white;
  text-align: center;
}

.effect-card-title {
  font-size: 1.125rem;
  margin-bottom: 1rem;
  opacity: 0.9;
}

.effect-value {
  font-size: 5rem;
  font-weight: 700;
  line-height: 1;
  margin-bottom: 0.5rem;
}

.effect-unit {
  font-size: 2rem;
}

.effect-label {
  font-size: 1.25rem;
  opacity: 0.9;
}

.effect-comparison {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.effect-item {
  text-align: center;
}

.effect-item-value {
  font-size: 1.5rem;
  font-weight: 700;
}

.effect-item-label {
  font-size: 0.875rem;
  opacity: 0.8;
}

.effect-details {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.effect-detail-card {
  display: flex;
  gap: 1rem;
  padding: 1.5rem;
  background: var(--muted);
  border-radius: var(--radius);
}

.effect-detail-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
}

.effect-detail-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.effect-detail-text {
  font-size: 0.875rem;
  color: var(--muted-foreground);
}

@media (min-width: 1024px) {
  .effect-content {
    grid-template-columns: 1fr 1fr;
  }
}

/* ===== Comparison Section ===== */
.comparison {
  background: var(--muted);
}

.comparison-table-wrapper {
  overflow-x: auto;
}

.comparison-table {
  width: 100%;
  background: white;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border-collapse: collapse;
}

.comparison-table th,
.comparison-table td {
  padding: 1rem 1.5rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.comparison-table th {
  background: var(--muted);
  font-weight: 600;
  font-size: 0.875rem;
}

.comparison-table th:nth-child(3) {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: white;
}

.comparison-table td {
  font-size: 0.875rem;
}

.comparison-table td:nth-child(3) {
  background: rgba(13, 148, 136, 0.05);
  font-weight: 600;
  color: var(--primary);
}

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

.check-icon {
  color: var(--primary);
}

.x-icon {
  color: #ef4444;
}

/* ===== Trust Section ===== */
.trust-grid {
  display: grid;
  gap: 2rem;
}

.trust-card {
  background: white;
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border);
  transition: all 0.3s;
}

.trust-card:hover {
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
  transform: translateY(-4px);
}

.trust-number {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.trust-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.trust-text {
  font-size: 0.875rem;
  color: var(--muted-foreground);
  line-height: 1.7;
}

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

@media (min-width: 1024px) {
  .trust-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

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

.flow-grid {
  display: grid;
  gap: 1.5rem;
  position: relative;
}

.flow-line {
  display: none;
}

.flow-step {
  display: flex;
  gap: 1.5rem;
  background: white;
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.flow-number {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 1.25rem;
}

.flow-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.flow-text {
  font-size: 0.875rem;
  color: var(--muted-foreground);
}

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

@media (min-width: 1024px) {
  .flow-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ===== FAQ Section ===== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: white;
  border-radius: var(--radius);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--foreground);
  transition: background 0.3s;
}

.faq-question:hover {
  background: var(--muted);
}

.faq-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  transition: transform 0.3s;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  display: none;
  padding: 0 1.5rem 1.5rem;
  font-size: 0.875rem;
  color: var(--muted-foreground);
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  display: block;
}

/* ===== CTA Section ===== */
.cta {
  background: linear-gradient(135deg, #0f766e 0%, #1e40af 100%);
  color: white;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.cta-content {
  position: relative;
  z-index: 1;
}

.cta-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.cta-text {
  font-size: 1.125rem;
  opacity: 0.9;
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-buttons {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  justify-content: center;
  align-items: center;
}

.cta-note {
  font-size: 0.875rem;
  opacity: 0.8;
  margin-top: 1.5rem;
}

@media (min-width: 768px) {
  .cta-title {
    font-size: 2.5rem;
  }

  .cta-buttons {
    flex-direction: row;
  }
}

/* ===== Footer ===== */
.footer {
  background: #0f172a;
  color: white;
  padding: 4rem 0 2rem;
}

.footer-content {
  display: grid;
  gap: 2rem;
  margin-bottom: 3rem;
}

.footer-logo {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.footer-logo span {
  color: var(--primary);
}

.footer-description {
  font-size: 0.875rem;
  opacity: 0.7;
  line-height: 1.7;
}

.footer-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a {
  font-size: 0.875rem;
  opacity: 0.7;
  transition: opacity 0.3s;
}

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

.footer-contact p {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  opacity: 0.7;
  margin-bottom: 0.75rem;
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  text-align: center;
}

.footer-copyright {
  font-size: 0.875rem;
  opacity: 0.7;
}

.footer-legal {
  display: flex;
  gap: 1.5rem;
}

.footer-legal a {
  font-size: 0.75rem;
  opacity: 0.7;
  transition: opacity 0.3s;
}

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

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

  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}