/* ============================================
   ROYAL NEO — Apple Japan Design System
   ============================================ */

/* --- Custom Properties --- */
:root {
  /* Colors */
  --color-primary: #1d1d1f;
  --color-white: #fff;
  --color-black: #000;
  --color-gray-bg: #f5f5f7;
  --color-on-dark: #f5f5f7;
  --color-apple-blue: #0071e3;
  --color-link-blue: #0066cc;
  --color-bright-blue: #2997ff;
  --color-nav-bg: rgba(0, 0, 0, 0.8);
  --color-nav-text: rgba(0, 0, 0, 0.8);
  --color-secondary-text: rgba(0, 0, 0, 0.56);
  --color-glyph-gray: #6e6e73;

  /* Typography */
  --font-text: "SF Pro JP", "SF Pro Text", "SF Pro Icons",
    "Hiragino Kaku Gothic Pro", "ヒラギノ角ゴ Pro W3",
    メイリオ, Meiryo, "ＭＳ Ｐゴシック",
    "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-display: "SF Pro JP", "SF Pro Display", "SF Pro Icons",
    "Hiragino Kaku Gothic Pro", "ヒラギノ角ゴ Pro W3",
    メイリオ, Meiryo, "ＭＳ Ｐゴシック",
    "Helvetica Neue", Helvetica, Arial, sans-serif;

  /* Layout */
  --max-width: 1260px;
  --max-width-hero: 1680px;
  --nav-height: 44px;

  /* Transitions */
  --transition: 0.3s ease;
}

/* --- 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-text);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.47;
  letter-spacing: -0.357px;
  color: var(--color-primary);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: normal;
}

a {
  color: var(--color-link-blue);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  text-decoration: underline;
}

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* --- Utility --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.container--hero {
  max-width: var(--max-width-hero);
  margin: 0 auto;
  padding: 0 24px;
}

/* Fade-in animation */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* --- Navigation --- */
.global-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: var(--color-nav-bg);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
}

.global-nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.global-nav__logo {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-on-dark);
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.global-nav__logo a {
  color: inherit;
  text-decoration: none;
}

.global-nav__links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.global-nav__links a {
  font-size: 12px;
  font-weight: 400;
  line-height: 1;
  color: var(--color-on-dark);
  text-decoration: none;
  letter-spacing: normal;
  transition: opacity var(--transition);
}

.global-nav__links a:hover {
  opacity: 0.72;
  text-decoration: none;
}

.global-nav__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-apple-blue);
  color: var(--color-white) !important;
  border-radius: 980px;
  font-size: 12px;
  padding: 4px 14px;
  opacity: 1 !important;
  transition: background var(--transition);
}

.global-nav__cta:hover {
  background: #0077ed;
  opacity: 1 !important;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 20px;
  height: var(--nav-height);
  cursor: pointer;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--color-on-dark);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger.is-active span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

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

.hamburger.is-active span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Mobile nav overlay */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: #fafafc;
  z-index: 999;
  padding: 32px 24px;
  overflow-y: auto;
}

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

.mobile-nav a {
  display: block;
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  padding: 12px 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  text-decoration: none;
}

.mobile-nav a:hover {
  text-decoration: none;
  color: var(--color-apple-blue);
}

/* --- Hero Section --- */
.hero {
  background: var(--color-black);
  padding-top: calc(var(--nav-height) + 80px);
  padding-bottom: 100px;
  text-align: center;
  overflow: hidden;
}

.hero__title {
  font-family: var(--font-display);
  font-size: 80px;
  font-weight: 600;
  line-height: 1.09;
  letter-spacing: normal;
  color: var(--color-on-dark);
  margin-bottom: 16px;
}

.hero__subtitle {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 400;
  line-height: 1.14;
  letter-spacing: 0.196px;
  color: var(--color-on-dark);
  margin-bottom: 32px;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-apple-blue);
  color: var(--color-white);
  font-size: 17px;
  font-weight: 400;
  padding: 12px 28px;
  border-radius: 980px;
  text-decoration: none;
  transition: background var(--transition);
  margin-bottom: 60px;
}

.hero__cta:hover {
  background: #0077ed;
  text-decoration: none;
  color: var(--color-white);
}

.hero__image-placeholder {
  max-width: 580px;
  height: 360px;
  margin: 0 auto;
  border-radius: 20px;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 40%, #0f3460 70%, #0071e3 100%);
  opacity: 0.7;
}

/* --- Product Highlight --- */
.product-highlight {
  background: var(--color-white);
  padding: 100px 0;
  text-align: center;
}

.product-highlight__name {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 600;
  line-height: 1.10;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.product-highlight__desc {
  font-size: 21px;
  font-weight: 400;
  line-height: 1.24;
  letter-spacing: 0.231px;
  color: var(--color-secondary-text);
  max-width: 600px;
  margin: 0 auto 20px;
}

.product-highlight__price {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 600;
  line-height: 1.14;
  color: var(--color-primary);
  margin-bottom: 24px;
}

.product-highlight__link {
  font-size: 21px;
  font-weight: 400;
  color: var(--color-link-blue);
  text-decoration: none;
}

.product-highlight__link:hover {
  text-decoration: underline;
}

/* --- Features --- */
.features {
  background: var(--color-gray-bg);
  padding: 100px 0;
}

.features__heading {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 600;
  line-height: 1.10;
  text-align: center;
  color: var(--color-primary);
  margin-bottom: 60px;
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  background: var(--color-white);
  border-radius: 18px;
  padding: 48px 32px;
  text-align: center;
  transition: box-shadow var(--transition);
}

.feature-card:hover {
  box-shadow: rgba(0, 0, 0, 0.22) 3px 5px 30px 0px;
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-card__icon svg {
  width: 48px;
  height: 48px;
  color: var(--color-apple-blue);
}

.feature-card__title {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 600;
  line-height: 1.24;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.feature-card__desc {
  font-size: 14px;
  font-weight: 400;
  line-height: 1.47;
  color: var(--color-secondary-text);
  letter-spacing: normal;
}

/* --- Brand Story --- */
.brand-story {
  background: var(--color-white);
  padding: 120px 0;
}

.brand-story__heading {
  font-family: var(--font-display);
  font-size: 53px;
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.53px;
  color: var(--color-primary);
  margin-bottom: 48px;
  max-width: 800px;
}

.brand-story__text {
  font-size: 21px;
  font-weight: 400;
  line-height: 1.47;
  letter-spacing: 0.231px;
  color: var(--color-secondary-text);
  max-width: 720px;
  margin-bottom: 28px;
}

.brand-story__text:last-child {
  margin-bottom: 0;
}

/* --- FAQ --- */
.faq {
  background: var(--color-gray-bg);
  padding: 100px 0;
}

.faq__heading {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 600;
  line-height: 1.10;
  text-align: center;
  color: var(--color-primary);
  margin-bottom: 60px;
}

.faq__list {
  max-width: 780px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.faq-item:first-child {
  border-top: 1px solid rgba(0, 0, 0, 0.1);
}

.faq-item__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 20px 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.47;
  color: var(--color-primary);
  cursor: pointer;
  background: none;
  border: none;
  text-align: left;
  letter-spacing: -0.357px;
}

.faq-item__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-left: 16px;
  transition: transform var(--transition);
}

.faq-item.is-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.is-open .faq-item__answer {
  max-height: 300px;
}

.faq-item__answer-inner {
  padding-bottom: 20px;
  font-size: 17px;
  line-height: 1.47;
  color: var(--color-secondary-text);
}

/* --- Contact / CTA --- */
.contact {
  background: var(--color-black);
  padding: 100px 0;
  text-align: center;
}

.contact__heading {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 600;
  line-height: 1.10;
  color: var(--color-on-dark);
  margin-bottom: 20px;
}

.contact__desc {
  font-size: 21px;
  font-weight: 400;
  line-height: 1.24;
  letter-spacing: 0.231px;
  color: rgba(255, 255, 255, 0.72);
  margin-bottom: 12px;
}

.contact__email {
  color: var(--color-bright-blue);
  font-size: 17px;
  margin-bottom: 40px;
  display: inline-block;
}

.contact__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-apple-blue);
  color: var(--color-white);
  font-size: 17px;
  font-weight: 400;
  padding: 12px 28px;
  border-radius: 980px;
  text-decoration: none;
  transition: background var(--transition);
}

.contact__cta:hover {
  background: #0077ed;
  text-decoration: none;
  color: var(--color-white);
}

/* --- Footer --- */
.footer {
  background: #1d1d1f;
  padding: 40px 0;
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer__copy {
  font-size: 12px;
  font-weight: 400;
  line-height: 1.42;
  color: var(--color-glyph-gray);
  letter-spacing: normal;
}

.footer__links {
  display: flex;
  gap: 24px;
}

.footer__links a {
  font-size: 12px;
  font-weight: 400;
  line-height: 1.42;
  color: var(--color-glyph-gray);
  text-decoration: none;
  letter-spacing: normal;
  transition: color var(--transition);
}

.footer__links a:hover {
  color: var(--color-on-dark);
  text-decoration: none;
}

/* --- Product Detail Page --- */
.product-detail {
  padding-top: calc(var(--nav-height) + 60px);
  padding-bottom: 100px;
}

.product-detail__image {
  width: 100%;
  max-width: 640px;
  height: 400px;
  margin: 0 auto 60px;
  border-radius: 20px;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 40%, #0f3460 70%, #0071e3 100%);
}

.product-detail__info {
  max-width: 640px;
  margin: 0 auto;
}

.product-detail__name {
  font-family: var(--font-display);
  font-size: 53px;
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.53px;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.product-detail__tagline {
  font-size: 21px;
  font-weight: 400;
  line-height: 1.24;
  letter-spacing: 0.231px;
  color: var(--color-secondary-text);
  margin-bottom: 32px;
}

.product-detail__price {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 32px;
}

.product-detail__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-apple-blue);
  color: var(--color-white);
  font-size: 17px;
  font-weight: 400;
  padding: 12px 28px;
  border-radius: 980px;
  text-decoration: none;
  transition: background var(--transition);
  margin-bottom: 60px;
}

.product-detail__cta:hover {
  background: #0077ed;
  text-decoration: none;
  color: var(--color-white);
}

.product-detail__section-title {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 600;
  line-height: 1.18;
  letter-spacing: 0.196px;
  color: var(--color-primary);
  margin-bottom: 20px;
  margin-top: 48px;
}

.product-detail__text {
  font-size: 17px;
  line-height: 1.47;
  color: var(--color-secondary-text);
  margin-bottom: 16px;
}

.product-detail__ingredients {
  list-style: none;
  padding: 0;
}

.product-detail__ingredients li {
  font-size: 17px;
  line-height: 1.47;
  color: var(--color-secondary-text);
  padding: 8px 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.product-detail__ingredients li:first-child {
  border-top: 1px solid rgba(0, 0, 0, 0.08);
}

/* ============================================
   Responsive
   ============================================ */

/* Medium — Tablet (834–1023px) */
@media (max-width: 1023px) {
  .hero__title {
    font-size: 56px;
  }

  .hero__subtitle {
    font-size: 24px;
  }

  .features__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .brand-story__heading {
    font-size: 40px;
  }

  .product-detail__name {
    font-size: 40px;
  }
}

/* Small — Mobile (≤833px) */
@media (max-width: 833px) {
  .global-nav__links {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .hero {
    padding-top: calc(var(--nav-height) + 48px);
    padding-bottom: 64px;
  }

  .hero__title {
    font-size: 44px;
  }

  .hero__subtitle {
    font-size: 21px;
  }

  .hero__image-placeholder {
    height: 220px;
    margin-left: 24px;
    margin-right: 24px;
  }

  .product-highlight {
    padding: 64px 0;
  }

  .product-highlight__name {
    font-size: 28px;
  }

  .product-highlight__desc {
    font-size: 17px;
  }

  .product-highlight__price {
    font-size: 21px;
  }

  .features {
    padding: 64px 0;
  }

  .features__heading {
    font-size: 28px;
    margin-bottom: 40px;
  }

  .features__grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .brand-story {
    padding: 64px 0;
  }

  .brand-story__heading {
    font-size: 32px;
    letter-spacing: normal;
  }

  .brand-story__text {
    font-size: 17px;
  }

  .faq {
    padding: 64px 0;
  }

  .faq__heading {
    font-size: 28px;
    margin-bottom: 40px;
  }

  .contact {
    padding: 64px 0;
  }

  .contact__heading {
    font-size: 28px;
  }

  .contact__desc {
    font-size: 17px;
  }

  .footer__inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .product-detail {
    padding-top: calc(var(--nav-height) + 40px);
    padding-bottom: 64px;
  }

  .product-detail__image {
    height: 260px;
    border-radius: 12px;
  }

  .product-detail__name {
    font-size: 32px;
  }

  .product-detail__tagline {
    font-size: 17px;
  }

  .product-detail__price {
    font-size: 21px;
  }

  .product-detail__section-title {
    font-size: 21px;
  }
}