/* =============================================
   Familiaris Landing Page - styles.css
   CSS Variables / BEM / Mobile-first / Animations
   ============================================= */

/* --- CSS Variables --- */
:root {
  /* Colors */
  --color-primary: #4CAF50;
  --color-primary-dark: #388E3C;
  --color-primary-light: #C8E6C9;
  --color-accent: #5865F2;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-text-muted: #999999;
  --color-bg: #ffffff;
  --color-bg-light: #F8FAF8;
  --color-bg-dark: #212121;
  --color-border: #E0E0E0;
  /* Typography */
  --font-family: 'Noto Sans JP', 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: 2rem;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Layout */
  --container-max: 1100px;
  --nav-height: 64px;
  --border-radius: 12px;
  --border-radius-sm: 8px;
  --border-radius-lg: 20px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.8;
  overflow-x: hidden;
}

body.menu-open {
  overflow: hidden;
}

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

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

ul {
  list-style: none;
}

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

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

.section__label {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.section__title {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: var(--space-md);
}

.section__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  line-height: 1.7;
  max-width: 640px;
  margin: 0 auto var(--space-2xl);
}

.section--center {
  text-align: center;
}

/* =============================================
   1. Navbar
   ============================================= */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  height: var(--nav-height);
}

.navbar--scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.navbar__logo {
  width: 140px;
  flex-shrink: 0;
}

.navbar__links {
  display: none;
  gap: var(--space-xl);
}

.navbar__link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-light);
  transition: color var(--transition-fast);
}

.navbar__link:hover {
  color: var(--color-primary);
}

.navbar__cta {
  display: none;
  align-items: center;
  gap: var(--space-sm);
  background: var(--color-primary);
  color: #fff;
  font-size: var(--font-size-sm);
  font-weight: 700;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--border-radius-sm);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.navbar__cta:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
}

.navbar__cta-icon {
  width: 18px;
  height: 18px;
}

/* Hamburger */
.navbar__hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
}

.navbar__hamburger-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.navbar__hamburger--open .navbar__hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.navbar__hamburger--open .navbar__hamburger-line:nth-child(2) {
  opacity: 0;
}

.navbar__hamburger--open .navbar__hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu */
.navbar__mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2xl);
  z-index: 99;
}

.navbar__mobile-menu--open {
  display: flex;
}

.navbar__mobile-link {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
}

.navbar__mobile-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--color-primary);
  color: #fff;
  font-size: var(--font-size-lg);
  font-weight: 700;
  padding: var(--space-md) var(--space-2xl);
  border-radius: var(--border-radius-sm);
}

/* =============================================
   2. Hero
   ============================================= */
.hero {
  padding: var(--space-3xl) 0 var(--space-4xl);
  overflow: hidden;
}

.hero__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2xl);
}

.hero__text {
  text-align: center;
  max-width: 540px;
}

.hero__badge {
  display: inline-block;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  font-size: var(--font-size-xs);
  font-weight: 700;
  padding: var(--space-xs) var(--space-md);
  border-radius: 100px;
  margin-bottom: var(--space-lg);
  letter-spacing: 0.03em;
}

.hero__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: var(--space-lg);
}

.hero__title--accent {
  color: var(--color-primary);
}

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

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
}

.hero__image {
  width: 100%;
  max-width: 320px;
}

.hero__image img {
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-family: var(--font-family);
  font-weight: 700;
  border: none;
  cursor: pointer;
  border-radius: var(--border-radius-sm);
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  font-size: var(--font-size-base);
  padding: var(--space-md) var(--space-xl);
}

.btn--primary:hover {
  background: var(--color-primary-dark);
  box-shadow: 0 4px 16px rgba(76, 175, 80, 0.3);
}

.btn--outline {
  background: transparent;
  color: var(--color-text);
  font-size: var(--font-size-base);
  padding: var(--space-md) var(--space-xl);
  border: 2px solid var(--color-border);
}

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

.btn--discord {
  background: var(--color-accent);
  color: #fff;
  font-size: var(--font-size-lg);
  padding: var(--space-md) var(--space-2xl);
}

.btn--discord:hover {
  background: #4752C4;
  box-shadow: 0 4px 16px rgba(88, 101, 242, 0.3);
}

.btn__icon {
  width: 20px;
  height: 20px;
}

.btn--lg {
  font-size: var(--font-size-xl);
  padding: var(--space-lg) var(--space-2xl);
}

/* =============================================
   3. Problems
   ============================================= */
.problems {
  background: var(--color-bg-light);
}

.problems__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

.problems__card {
  background: var(--color-bg);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  text-align: center;
}

.problems__icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-md);
}

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

.problems__card-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: 1.7;
}

.problems__solution {
  text-align: center;
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
  padding: var(--space-lg);
  background: var(--color-bg);
  border-radius: var(--border-radius);
  border: 2px solid var(--color-primary-light);
}

/* =============================================
   4. Features
   ============================================= */
.features__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2xl);
  margin-bottom: var(--space-4xl);
}

.features__item:last-of-type {
  margin-bottom: var(--space-2xl);
}

.features__item-image {
  width: 100%;
  max-width: 360px;
}

.features__item-image img {
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
}

.features__item-text {
  text-align: center;
  max-width: 480px;
}

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

.features__item-title {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 700;
  margin-bottom: var(--space-md);
  line-height: 1.4;
}

.features__item-description {
  font-size: var(--font-size-base);
  color: var(--color-text-light);
  line-height: 1.8;
}

/* AI voice demo UI */
.features__voice-demo {
  background: var(--color-bg-light);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  width: 100%;
  max-width: 360px;
  box-shadow: var(--shadow-md);
}

.voice-demo__bubble {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  border-radius: var(--border-radius-sm) var(--border-radius-sm) var(--border-radius-sm) 4px;
  padding: var(--space-md) var(--space-lg);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-lg);
  position: relative;
}

.voice-demo__mic {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  font-weight: 700;
  margin-bottom: var(--space-lg);
}

.voice-demo__mic-icon {
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-lg);
}

.voice-demo__result {
  background: var(--color-bg);
  border-radius: var(--border-radius-sm);
  padding: var(--space-md);
  border: 1px solid var(--color-border);
}

.voice-demo__result-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-xs);
}

.voice-demo__result-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  padding: var(--space-xs) 0;
}

.voice-demo__result-row + .voice-demo__result-row {
  border-top: 1px solid var(--color-border);
}

/* Extra feature cards */
.features__cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.features__card {
  background: var(--color-bg-light);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  text-align: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.features__card-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-md);
}

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

.features__card-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: 1.7;
}

/* =============================================
   5. Activities
   ============================================= */
.activities {
  background: var(--color-bg-light);
}

.activities__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  max-width: 640px;
  margin: 0 auto;
}

.activities__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  background: var(--color-bg);
  border-radius: var(--border-radius-sm);
  padding: var(--space-md) var(--space-sm);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base);
}

.activities__item:hover {
  transform: translateY(-2px);
}

.activities__emoji {
  font-size: 2rem;
}

.activities__label {
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-align: center;
}

.activities__item--more {
  background: var(--color-primary-light);
  border: 2px dashed var(--color-primary);
  color: var(--color-primary-dark);
}

.activities__item--more .activities__label {
  font-weight: 700;
}

/* =============================================
   6. Steps
   ============================================= */
.steps {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
}

.steps .section__label {
  color: var(--color-primary-light);
}

.steps .section__title {
  color: #fff;
}

.steps .section__subtitle {
  color: rgba(255, 255, 255, 0.8);
}

.steps__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
  max-width: 480px;
  margin: 0 auto;
  position: relative;
}

/* Connector line */
.steps__list::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 48px;
  bottom: 48px;
  width: 2px;
  background: rgba(255, 255, 255, 0.3);
}

.steps__item {
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
  position: relative;
}

.steps__number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
  font-weight: 700;
  flex-shrink: 0;
  z-index: 1;
}

.steps__content {
  padding-top: var(--space-sm);
}

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

.steps__item-text {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.7;
}

/* =============================================
   7. CTA
   ============================================= */
.cta {
  position: relative;
  overflow: hidden;
}

.cta__bg {
  position: absolute;
  inset: 0;
  opacity: 0.06;
  pointer-events: none;
}

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

.cta__content {
  position: relative;
  z-index: 1;
}

.cta__title {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.cta__text {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  margin-bottom: var(--space-2xl);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.cta__stores {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.cta__store-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--color-bg-light);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  font-weight: 500;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--color-border);
}

/* =============================================
   8. Footer
   ============================================= */
.footer {
  background: var(--color-bg-dark);
  color: rgba(255, 255, 255, 0.6);
  padding: var(--space-2xl) 0;
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
  text-align: center;
}

.footer__logo {
  width: 120px;
  filter: brightness(0) invert(1);
  opacity: 0.8;
}

.footer__tagline {
  font-size: var(--font-size-sm);
}

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

.footer__link {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.5);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: rgba(255, 255, 255, 0.9);
}

.footer__copy {
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.3);
}

/* =============================================
   Scroll Animations
   ============================================= */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-up.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-up-delay-1 { transition-delay: 0.1s; }
.fade-up-delay-2 { transition-delay: 0.2s; }
.fade-up-delay-3 { transition-delay: 0.3s; }

/* Float animation for hero image */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.hero__image--float {
  animation: float 4s ease-in-out infinite;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .fade-up {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .hero__image--float {
    animation: none;
  }

  html {
    scroll-behavior: auto;
  }
}

/* =============================================
   Responsive: Tablet (768px+)
   ============================================= */
@media (min-width: 768px) {
  .problems__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .features__item {
    flex-direction: row;
    text-align: left;
  }

  .features__item--reverse {
    flex-direction: row-reverse;
  }

  .features__item-text {
    text-align: left;
  }

  .features__item-image {
    flex-shrink: 0;
    max-width: 300px;
  }

  .features__cards {
    grid-template-columns: repeat(3, 1fr);
  }

  .activities__grid {
    grid-template-columns: repeat(4, 1fr);
    max-width: 720px;
  }

  .hero__inner {
    flex-direction: row;
    justify-content: space-between;
  }

  .hero__text {
    text-align: left;
    flex: 1;
  }

  .hero__actions {
    justify-content: flex-start;
  }

  .hero__image {
    flex-shrink: 0;
    max-width: 300px;
  }
}

/* =============================================
   Responsive: Desktop (1024px+)
   ============================================= */
@media (min-width: 1024px) {
  .navbar__links {
    display: flex;
  }

  .navbar__cta {
    display: inline-flex;
  }

  .navbar__hamburger {
    display: none;
  }

  .hero__image {
    max-width: 360px;
  }

  .features__item-image {
    max-width: 400px;
  }

  .features__voice-demo {
    max-width: 400px;
  }

  .activities__grid {
    grid-template-columns: repeat(6, 1fr);
    max-width: 800px;
  }

  .steps__list {
    flex-direction: row;
    max-width: 100%;
    gap: var(--space-xl);
  }

  .steps__list::before {
    left: 48px;
    right: 48px;
    top: 24px;
    bottom: auto;
    height: 2px;
    width: auto;
  }

  .steps__item {
    flex-direction: column;
    align-items: center;
    text-align: center;
    flex: 1;
  }
}

/* =============================================
   Legal Pages (Privacy Policy, Terms of Service)
   ============================================= */
.legal {
  padding-top: calc(var(--nav-height) + var(--space-3xl));
  padding-bottom: var(--space-4xl);
}

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

.legal__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: var(--space-sm);
}

.legal__updated {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-3xl);
}

.legal__section {
  margin-bottom: var(--space-2xl);
}

.legal__section-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-primary-light);
}

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

.legal__text {
  font-size: var(--font-size-base);
  color: var(--color-text-light);
  line-height: 1.9;
  margin-bottom: var(--space-md);
}

.legal__text a {
  color: var(--color-primary);
  text-decoration: underline;
  transition: color var(--transition-fast);
}

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

.legal__list {
  list-style: disc;
  padding-left: var(--space-xl);
  margin-bottom: var(--space-md);
}

.legal__list li {
  font-size: var(--font-size-base);
  color: var(--color-text-light);
  line-height: 1.9;
  margin-bottom: var(--space-sm);
}

.legal__list li strong {
  color: var(--color-text);
}

.legal__table-wrapper {
  overflow-x: auto;
  margin: var(--space-lg) 0;
}

.legal__table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}

.legal__table caption {
  text-align: left;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  padding-bottom: var(--space-sm);
}

.legal__table th {
  background: var(--color-bg-light);
  font-weight: 700;
  color: var(--color-text);
  padding: var(--space-md);
  text-align: left;
  border-bottom: 2px solid var(--color-primary-light);
}

.legal__table td {
  padding: var(--space-md);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-light);
  vertical-align: top;
}

.legal__table tr:hover td {
  background: var(--color-bg-light);
}

.legal__contact {
  background: var(--color-bg-light);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  border: 1px solid var(--color-border);
  margin-top: var(--space-md);
}

.legal__contact .legal__text + .legal__text {
  margin-top: var(--space-xs);
}

.legal__contact .legal__text {
  margin-bottom: 0;
}

/* Legal responsive: stack table on mobile */
@media (max-width: 767px) {
  .legal__table {
    font-size: var(--font-size-xs);
  }

  .legal__table th,
  .legal__table td {
    padding: var(--space-sm);
  }
}