/* ========================================
   Cocoa - AI恋愛コーチアプリ サポートサイト
   スタイルシート
   ======================================== */

/* CSS Variables - アプリのテーマカラー */
:root {
  /* メインカラー */
  --color-primary: #e8a598;
  --color-primary-dark: #d4897f;
  --color-primary-light: #f5d4ce;
  --color-primary-50: #fdf5f3;

  /* セカンダリーカラー */
  --color-secondary: #7db9a8;
  --color-secondary-dark: #5a9686;
  --color-secondary-light: #b8d9ce;

  /* アクセント */
  --color-accent: #f4d03f;

  /* 背景・テキスト */
  --color-background: #fdf8f6;
  --color-surface: #ffffff;
  --color-text: #2c3e50;
  --color-text-secondary: #7f8c8d;
  --color-text-muted: #bdc3c7;

  /* ボーダー */
  --color-border: #eceff1;

  /* ステータス */
  --color-success: #58d68d;
  --color-warning: #f7dc6f;
  --color-error: #ec7063;

  /* タイポグラフィ */
  --font-jp: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-en: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* サイズ */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-round: 999px;

  /* シャドウ */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
    0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1),
    0 8px 10px -6px rgba(0, 0, 0, 0.1);

  /* トランジション */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-jp);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-background);
  min-height: 100vh;
}

body.lang-en {
  font-family: var(--font-en);
}

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

a {
  color: var(--color-primary-dark);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
}

/* ========================================
   Header
   ======================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(253, 248, 246, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
}

.nav-brand:hover {
  color: var(--color-text);
}

.brand-icon {
  font-size: 1.75rem;
  line-height: 1;
}

.brand-name {
  letter-spacing: -0.02em;
}

/* Language Switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  font-weight: 500;
}

.lang-link {
  color: var(--color-text-muted);
  padding: 4px 8px;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.lang-link:hover {
  color: var(--color-text-secondary);
  background: var(--color-primary-50);
}

.lang-link.active {
  color: var(--color-primary-dark);
  background: var(--color-primary-light);
}

.lang-divider {
  color: var(--color-border);
}

/* ========================================
   Main Content
   ======================================== */
.site-main {
  min-height: calc(100vh - 64px - 200px);
}

/* Hero Section */
.hero {
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-primary-light) 100%
  );
  padding: 80px 0 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(
      circle at 30% 70%,
      rgba(255, 255, 255, 0.3) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 70% 30%,
      rgba(255, 255, 255, 0.2) 0%,
      transparent 40%
    );
  animation: heroShine 15s ease-in-out infinite;
}

@keyframes heroShine {
  0%,
  100% {
    transform: rotate(0deg);
  }
  50% {
    transform: rotate(180deg);
  }
}

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

.hero-icon {
  font-size: 5rem;
  margin-bottom: 24px;
  display: inline-block;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  line-height: 1.3;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: rgba(255, 255, 255, 0.95);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Content Layout */
.content-wrapper {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  padding: 48px 0;
}

@media (max-width: 968px) {
  .content-wrapper {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

/* Table of Contents */
.toc {
  position: sticky;
  top: 88px;
  height: fit-content;
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.toc-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.toc-list {
  list-style: none;
}

.toc-item {
  margin-bottom: 4px;
}

.toc-link {
  display: block;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  transition: all var(--transition-fast);
  border-left: 3px solid transparent;
}

.toc-link:hover {
  background: var(--color-primary-50);
  color: var(--color-text);
}

.toc-link.active {
  background: var(--color-primary-50);
  color: var(--color-primary-dark);
  border-left-color: var(--color-primary);
  font-weight: 500;
}

@media (max-width: 968px) {
  .toc {
    position: static;
    order: -1;
  }

  .toc-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }

  .toc-item {
    margin: 0;
  }

  .toc-link {
    border-left: none;
    border-bottom: 2px solid transparent;
  }

  .toc-link.active {
    border-left-color: transparent;
    border-bottom-color: var(--color-primary);
  }
}

/* Main Article */
.article {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

@media (max-width: 768px) {
  .article {
    padding: 24px;
  }
}

.article-header {
  margin-bottom: 40px;
  padding-bottom: 32px;
  border-bottom: 2px solid var(--color-border);
}

.article-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
  line-height: 1.3;
}

.article-meta {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

/* Sections */
.section {
  margin-bottom: 48px;
}

.section:last-child {
  margin-bottom: 0;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-primary-light) 100%
  );
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.section-content {
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.section-content p {
  margin-bottom: 16px;
}

.section-content p:last-child {
  margin-bottom: 0;
}

/* Feature Cards */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin: 32px 0;
}

.feature-card {
  background: var(--color-background);
  border-radius: var(--radius-xl);
  padding: 28px;
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.feature-card-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(
    135deg,
    var(--color-secondary) 0%,
    var(--color-secondary-light) 100%
  );
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin-bottom: 16px;
}

.feature-card-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

.feature-card-desc {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* FAQ */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--color-background);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.faq-question {
  padding: 20px 24px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: background var(--transition-fast);
}

.faq-question:hover {
  background: var(--color-primary-50);
}

.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--color-primary);
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 24px 20px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  display: none;
}

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

/* Steps */
.steps {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin: 32px 0;
}

.step {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.step-number {
  width: 48px;
  height: 48px;
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-primary-dark) 100%
  );
  color: #fff;
  border-radius: var(--radius-round);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.125rem;
  flex-shrink: 0;
}

.step-content {
  flex: 1;
  padding-top: 8px;
}

.step-title {
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 6px;
}

.step-desc {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* Contact Card */
.contact-card {
  background: linear-gradient(
    135deg,
    var(--color-secondary) 0%,
    var(--color-secondary-light) 100%
  );
  border-radius: var(--radius-xl);
  padding: 32px;
  text-align: center;
  color: #fff;
}

.contact-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.contact-card-text {
  opacity: 0.95;
  margin-bottom: 20px;
  line-height: 1.6;
}

.contact-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  color: var(--color-secondary-dark);
  padding: 14px 28px;
  border-radius: var(--radius-round);
  font-weight: 600;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-md);
}

.contact-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--color-secondary-dark);
}

/* Lists */
.content-list {
  list-style: none;
  padding: 0;
}

.content-list li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 12px;
  color: var(--color-text-secondary);
}

.content-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  background: var(--color-primary);
  border-radius: var(--radius-round);
}

/* Tips Box */
.tip-box {
  background: linear-gradient(135deg, var(--color-accent) 0%, #f9e79f 100%);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin: 24px 0;
}

.tip-box-title {
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.tip-box-content {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* Info Box */
.info-box {
  background: var(--color-primary-50);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 20px 24px;
  margin: 24px 0;
}

.info-box-title {
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

.info-box-content {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 48px 0 32px;
  margin-top: 64px;
}

.footer-content {
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 24px;
  font-size: 1.25rem;
  font-weight: 700;
}

.footer-icon {
  font-size: 1.5rem;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
  margin-bottom: 24px;
}

.footer-nav a {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  transition: color var(--transition-fast);
}

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

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

/* ========================================
   Privacy Policy / Terms Pages
   ======================================== */
.policy-section {
  margin-bottom: 40px;
}

.policy-section-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-primary-light);
}

.policy-section-content {
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.policy-section-content p {
  margin-bottom: 16px;
}

.policy-list {
  list-style: decimal;
  padding-left: 24px;
  margin: 16px 0;
}

.policy-list li {
  margin-bottom: 12px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.policy-date {
  background: var(--color-background);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  margin-bottom: 32px;
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

/* ========================================
   Lucide Icons
   ======================================== */
[class*='lucide-'],
i[data-lucide] {
  display: inline-block;
  width: 1em;
  height: 1em;
  vertical-align: middle;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

.brand-icon i[data-lucide],
.hero-icon i[data-lucide],
.section-icon i[data-lucide],
.feature-card-icon i[data-lucide],
.footer-icon i[data-lucide] {
  width: 1em;
  height: 1em;
}

.tip-box-title i[data-lucide] {
  flex-shrink: 0;
}

.contact-button i[data-lucide] {
  flex-shrink: 0;
}

/* ========================================
   Utilities
   ======================================== */
.text-center {
  text-align: center;
}
.text-left {
  text-align: left;
}
.text-right {
  text-align: right;
}

.mt-0 {
  margin-top: 0;
}
.mt-1 {
  margin-top: 8px;
}
.mt-2 {
  margin-top: 16px;
}
.mt-3 {
  margin-top: 24px;
}
.mt-4 {
  margin-top: 32px;
}

.mb-0 {
  margin-bottom: 0;
}
.mb-1 {
  margin-bottom: 8px;
}
.mb-2 {
  margin-bottom: 16px;
}
.mb-3 {
  margin-bottom: 24px;
}
.mb-4 {
  margin-bottom: 32px;
}

/* Print Styles */
@media print {
  .site-header,
  .site-footer,
  .toc {
    display: none;
  }

  .site-main {
    min-height: auto;
  }

  .article {
    box-shadow: none;
    border: none;
    padding: 0;
  }
}