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

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #000;
  color: #f5f5f7;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* CJK font overrides */
[lang="ja"] body { font-family: 'Noto Sans JP', 'Inter', sans-serif; }
[lang="zh"] body { font-family: 'Noto Sans SC', 'Inter', sans-serif; }
[lang="ar"] body { font-family: 'Noto Sans Arabic', 'Inter', sans-serif; }

/* CJK line-breaking */
[lang="ja"] body,
[lang="zh"] body { word-break: keep-all; }

a {
  color: #2997ff;
  text-decoration: none;
  transition: color 0.3s;
}

a:hover { color: #6cb8ff; }

img, video, iframe {
  max-width: 100%;
  display: block;
}

ul { list-style: none; }

::selection {
  background: rgba(41, 151, 255, 0.3);
  color: #fff;
}

/* ===== CSS Variables ===== */
:root {
  --color-bg: #000000;
  --color-bg-alt: #0a0a0a;
  --color-bg-card: #111111;
  --color-bg-card-hover: #1a1a1a;
  --color-text: #f5f5f7;
  --color-text-secondary: #86868b;
  --color-accent: #2997ff;
  --color-accent-hover: #6cb8ff;
  --color-border: rgba(255, 255, 255, 0.08);
  --font-size-hero: clamp(2.8rem, 7vw, 5.5rem);
  --font-size-section: clamp(2rem, 4.5vw, 3.5rem);
  --font-size-card: clamp(1.3rem, 2.5vw, 1.75rem);
  --font-size-body: clamp(1rem, 1.2vw, 1.15rem);
  --section-padding: clamp(80px, 12vh, 160px) clamp(20px, 5vw, 80px);
  --max-width: 1200px;
  --nav-height: 64px;
  --transition-fast: 0.2s ease;
  --transition-med: 0.4s ease;
  --transition-slow: 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ===== Utility ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
}

.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;
}

/* ===== Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }

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

/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  transition: background var(--transition-fast), backdrop-filter var(--transition-fast);
}

.nav.scrolled {
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 clamp(20px, 4vw, 48px);
  max-width: 1400px;
  margin: 0 auto;
}

.nav__logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.nav__logo span {
  color: var(--color-accent);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav__link {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  white-space: nowrap;
}

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

.nav__cta {
  display: inline-flex;
  align-items: center;
  padding: 8px 20px;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 980px;
  transition: background var(--transition-fast), transform var(--transition-fast);
  white-space: nowrap;
}

.nav__cta:hover {
  background: var(--color-accent-hover);
  color: #fff;
  transform: scale(1.04);
}

/* Language Switcher */
.lang-switcher {
  position: relative;
}

.lang-switcher__btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 8px;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.lang-switcher__btn:hover {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.06);
}

.lang-switcher__btn svg {
  width: 18px;
  height: 18px;
}

.lang-switcher__dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: rgba(28, 28, 30, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 6px;
  min-width: 160px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

.lang-switcher.open .lang-switcher__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-switcher__dropdown a {
  display: block;
  padding: 8px 14px;
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  border-radius: 8px;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.lang-switcher__dropdown a:hover,
.lang-switcher__dropdown a.active {
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-text);
}

/* Mobile burger */
.nav__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  width: 40px;
  height: 40px;
}

.nav__burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav__burger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__burger.active span:nth-child(2) {
  opacity: 0;
}

.nav__burger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu */
.mobile-menu {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.96);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 999;
  display: flex;
  flex-direction: column;
  padding: 40px 30px;
  gap: 8px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}

.mobile-menu.open {
  opacity: 1;
  visibility: visible;
}

.mobile-menu a {
  color: var(--color-text);
  font-size: 1.5rem;
  font-weight: 600;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}

.mobile-menu .mobile-lang-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}

.mobile-menu .mobile-lang-list a {
  font-size: 0.9rem;
  font-weight: 500;
  padding: 6px 14px;
  border: 1px solid var(--color-border);
  border-radius: 980px;
  color: var(--color-text-secondary);
  border-bottom: none;
}

.mobile-menu .mobile-lang-list a.active {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--section-padding);
  padding-top: calc(var(--nav-height) + 60px);
  overflow: hidden;
}

.hero__glow {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 600px;
  height: 600px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(41, 151, 255, 0.15) 0%, rgba(41, 151, 255, 0.05) 40%, transparent 70%);
  animation: glowPulse 6s ease-in-out infinite;
  pointer-events: none;
}

@keyframes glowPulse {
  0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
  50% { transform: translate(-50%, -50%) scale(1.15); opacity: 0.7; }
}

@media (prefers-reduced-motion: reduce) {
  .hero__glow { animation: none; }
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.hero__title {
  font-size: var(--font-size-hero);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.08;
  margin-bottom: 20px;
  background: linear-gradient(to bottom, #fff 30%, #86868b 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  color: var(--color-text-secondary);
  max-width: 640px;
  margin: 0 auto 12px;
  line-height: 1.5;
}

.hero__elderly {
  font-size: clamp(0.95rem, 1.5vw, 1.15rem);
  color: var(--color-accent);
  margin-bottom: 40px;
  font-weight: 500;
}

.hero__actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 980px;
  border: none;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  font-family: inherit;
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  color: #fff;
  transform: scale(1.04);
  box-shadow: 0 0 30px rgba(41, 151, 255, 0.3);
}

.btn--secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-text);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn--secondary:hover {
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
  transform: scale(1.04);
}

.hero__scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--color-text-secondary);
  font-size: 0.75rem;
  animation: scrollBounce 2s ease-in-out infinite;
}

.hero__scroll svg {
  width: 24px;
  height: 24px;
  opacity: 0.5;
}

@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

@media (prefers-reduced-motion: reduce) {
  .hero__scroll { animation: none; }
}

/* ===== Section Common ===== */
.section {
  padding: var(--section-padding);
}

.section__label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.section__title {
  font-size: var(--font-size-section);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 20px;
}

.section__subtitle {
  font-size: var(--font-size-body);
  color: var(--color-text-secondary);
  max-width: 600px;
  line-height: 1.6;
}

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

.section__header {
  text-align: center;
  margin-bottom: 60px;
}

.section__header .section__subtitle {
  margin: 0 auto;
}

/* ===== Features ===== */
.features__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 40px;
  transition: background var(--transition-fast), transform var(--transition-fast), border-color var(--transition-fast);
}

.feature-card:hover {
  background: var(--color-bg-card-hover);
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.12);
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: 20px;
  color: var(--color-accent);
}

.feature-card__title {
  font-size: var(--font-size-card);
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.feature-card__desc {
  font-size: var(--font-size-body);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.features__callout {
  text-align: center;
  margin-top: 48px;
  padding: 32px;
  background: linear-gradient(135deg, rgba(41, 151, 255, 0.08) 0%, rgba(41, 151, 255, 0.02) 100%);
  border: 1px solid rgba(41, 151, 255, 0.15);
  border-radius: 16px;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
}

.features__callout p {
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
  font-weight: 500;
  color: var(--color-accent);
}

/* ===== Demo Video ===== */
.demo {
  text-align: center;
}

.demo__wrapper {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  border-radius: 20px;
  overflow: hidden;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  aspect-ratio: 16 / 9;
}

.demo__wrapper iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.demo__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0a0a0a 0%, #1a1a2e 100%);
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.demo__placeholder.hidden { display: none; }

.demo__play {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: rgba(41, 151, 255, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.demo__placeholder:hover .demo__play {
  transform: scale(1.1);
  box-shadow: 0 0 40px rgba(41, 151, 255, 0.4);
}

.demo__play svg {
  width: 32px;
  height: 32px;
  margin-left: 4px;
  fill: #fff;
}

/* ===== Team ===== */
.team__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.team-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 32px;
  text-align: center;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.team-card:hover {
  background: var(--color-bg-card-hover);
  transform: translateY(-4px);
}

.team-card__photo {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  margin: 0 auto 20px;
  overflow: hidden;
  background: linear-gradient(135deg, #1a1a2e, #2a2a4a);
  display: flex;
  align-items: center;
  justify-content: center;
}

.team-card__photo svg {
  width: 48px;
  height: 48px;
  color: var(--color-text-secondary);
}

.team-card__name {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.team-card__role {
  font-size: 0.9rem;
  color: var(--color-accent);
  margin-bottom: 12px;
  font-weight: 500;
}

.team-card__bio {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ===== FAQ ===== */
.faq__list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
}

.faq-item__question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  font-weight: 600;
  padding: 24px 0;
  cursor: pointer;
  text-align: start;
  font-family: inherit;
  gap: 16px;
  transition: color var(--transition-fast);
}

.faq-item__question:hover { color: var(--color-accent); }

.faq-item__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  transition: transform var(--transition-fast);
}

.faq-item.open .faq-item__icon {
  transform: rotate(45deg);
}

.faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq-item.open .faq-item__answer {
  max-height: 400px;
  padding-bottom: 24px;
}

.faq-item__answer p {
  font-size: var(--font-size-body);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ===== Investment CTA ===== */
.invest {
  text-align: center;
}

.invest__metrics {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.invest__metric {
  text-align: center;
}

.invest__metric-value {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: -0.02em;
}

.invest__metric-label {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-top: 4px;
}

.invest__form {
  max-width: 520px;
  margin: 0 auto;
  text-align: start;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 18px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  color: var(--color-text);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(41, 151, 255, 0.15);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: rgba(134, 134, 139, 0.6);
}

.invest__form .btn {
  width: 100%;
  padding: 16px;
  font-size: 1.05rem;
}

/* ===== Footer ===== */
.footer {
  padding: 32px clamp(20px, 4vw, 48px);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1400px;
  margin: 0 auto;
  flex-wrap: wrap;
  gap: 16px;
}

.footer__copy {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.footer__socials {
  display: flex;
  gap: 16px;
}

.footer__socials a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.footer__socials a:hover { color: var(--color-text); }

.footer__socials svg {
  width: 20px;
  height: 20px;
}

/* ===== RTL Overrides ===== */
[dir="rtl"] .nav__inner { flex-direction: row-reverse; }
[dir="rtl"] .nav__links { flex-direction: row-reverse; }
[dir="rtl"] .lang-switcher__dropdown { right: auto; left: 0; }
[dir="rtl"] .faq-item__question { text-align: right; }
[dir="rtl"] .faq-item__icon { transform: scaleX(-1); }
[dir="rtl"] .faq-item.open .faq-item__icon { transform: scaleX(-1) rotate(45deg); }
[dir="rtl"] .demo__play svg { margin-left: 0; margin-right: 4px; }
[dir="rtl"] .footer__inner { flex-direction: row-reverse; }
[dir="rtl"] .invest__form { text-align: right; }
[dir="rtl"] .hero__scroll { transform: translateX(50%); }
[dir="rtl"] @keyframes scrollBounce {
  0%, 100% { transform: translateX(50%) translateY(0); }
  50% { transform: translateX(50%) translateY(8px); }
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .features__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .feature-card { padding: 30px; }
}

@media (max-width: 768px) {
  .nav__links { display: none; }
  .nav__burger { display: flex; }

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

  .invest__metrics {
    gap: 24px;
  }

  .invest__metric-value {
    font-size: 2rem;
  }

  .hero {
    min-height: calc(100vh - 60px);
    padding-top: calc(var(--nav-height) + 40px);
  }

  .hero__glow {
    width: 350px;
    height: 350px;
  }

  .team__grid {
    grid-template-columns: 1fr;
    max-width: 400px;
  }

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

@media (max-width: 480px) {
  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    padding: 14px 24px;
    font-size: 0.95rem;
  }

  .feature-card { padding: 24px; }
}