/* ==========================================================================
   NATURIO — Brand Site Stylesheet
   ========================================================================== */

:root {
  --color-bg: #FBFAF7;
  --color-bg-alt: #F1F3EC;
  --color-bg-dark: #16261E;
  --color-green: #1F3A2E;
  --color-green-light: #3C5C48;
  --color-green-pale: #E7ECE4;
  --color-text: #262622;
  --color-text-muted: #6E6E63;
  --color-text-on-dark: #F4F1E6;
  --color-text-on-dark-muted: #B9C2B7;
  --color-border: #E2E1D6;

  --font-serif: "Zen Old Mincho", "Noto Serif JP", serif;
  --font-sans: "Zen Kaku Gothic New", "Noto Sans JP", -apple-system, BlinkMacSystemFont, sans-serif;

  --container-width: 1200px;
  --gutter: clamp(1.5rem, 5vw, 5rem);

  --transition-base: 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, figure { margin: 0; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
ul { list-style: none; margin: 0; padding: 0; }

.skip-link {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 200;
  background: var(--color-green);
  color: var(--color-text-on-dark);
  padding: 0.85rem 1.5rem;
  border-radius: 4px;
  font-size: 0.85rem;
  transform: translateY(-150%);
  transition: transform var(--transition-base);
}
.skip-link:focus { transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  font-weight: 300;
  line-height: 1.9;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---- Type helpers ---- */
.eyebrow {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-green-light);
  margin-bottom: 1.25rem;
}
.eyebrow--on-dark { color: var(--color-text-on-dark-muted); }

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-text);
}

.section-heading {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.65;
  max-width: 24ch;
}

.section-lede {
  margin-top: 1.5rem;
  color: var(--color-text-muted);
  font-size: 1rem;
  max-width: 46ch;
  line-height: 2;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  padding: 1rem 2.1rem;
  border: 1px solid currentColor;
  border-radius: 999px;
  transition: background var(--transition-base), color var(--transition-base), border-color var(--transition-base);
  white-space: nowrap;
}
.btn svg { width: 14px; height: 14px; transition: transform var(--transition-base); }
.btn:hover svg { transform: translateX(4px); }

.btn--primary {
  background: var(--color-green);
  border-color: var(--color-green);
  color: var(--color-text-on-dark);
}
.btn--primary:hover { background: var(--color-green-light); border-color: var(--color-green-light); }

.btn--outline-dark {
  color: var(--color-text);
  border-color: var(--color-text);
}
.btn--outline-dark:hover { background: var(--color-text); color: var(--color-bg); }

.btn--outline-light {
  color: var(--color-text-on-dark);
  border-color: rgba(244, 241, 230, 0.55);
}
.btn--outline-light:hover { background: var(--color-text-on-dark); color: var(--color-green); }

.btn--ghost {
  border-color: transparent;
  padding-inline: 0;
  color: var(--color-green);
}
.btn--ghost:hover { color: var(--color-green-light); }
.btn--ghost:hover svg { transform: translateX(4px); }

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 100;
  padding: 1.6rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--transition-base), padding var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(251, 250, 247, 0.9);
  backdrop-filter: blur(10px);
  padding-block: 1.05rem;
  border-color: var(--color-border);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  letter-spacing: 0.22em;
  color: var(--color-text-on-dark);
  transition: color var(--transition-base);
}
.site-header.is-scrolled .logo,
.mobile-nav-open .logo { color: var(--color-text); }
.logo__word { font-family: var(--font-serif); }
.logo__mark {
  width: 40px;
  height: 40px;
  object-fit: contain;
  /* Over the dark hero: render the mark in white. */
  filter: brightness(0) invert(1);
  transition: filter var(--transition-base);
}
/* On the light (scrolled) header and open mobile nav: full-color mark. */
.site-header.is-scrolled .logo__mark,
.mobile-nav-open .logo__mark { filter: none; }

.main-nav { display: flex; align-items: center; gap: 2.75rem; }
.main-nav__links { display: flex; gap: 2.5rem; }
.main-nav__links a {
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--color-text-on-dark-muted);
  position: relative;
  padding-bottom: 0.3rem;
  transition: color var(--transition-base);
}
.site-header.is-scrolled .main-nav__links a { color: var(--color-text-muted); }
.main-nav__links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 1px;
  background: currentColor;
  transition: right var(--transition-base);
}
.main-nav__links a:hover { color: var(--color-text-on-dark); }
.site-header.is-scrolled .main-nav__links a:hover { color: var(--color-text); }
.main-nav__links a:hover::after { right: 0; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 0.5rem;
  z-index: 110;
}
.nav-toggle span {
  width: 22px;
  height: 1px;
  background: var(--color-text-on-dark);
  transition: background var(--transition-base), transform var(--transition-base), opacity var(--transition-base);
}
.site-header.is-scrolled .nav-toggle span,
.mobile-nav-open .nav-toggle span { background: var(--color-text); }

.mobile-nav {
  position: fixed;
  inset: 0;
  background: var(--color-bg);
  z-index: 90;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2rem;
  padding: 0 var(--gutter);
  transform: translateY(-100%);
  transition: transform var(--transition-base);
}
.mobile-nav-open .mobile-nav { transform: translateY(0); }
.mobile-nav a {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  color: var(--color-text);
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  color: var(--color-text-on-dark);
}
.hero__media {
  position: absolute;
  inset: 0;
  z-index: -1;
}
.hero__media img { width: 100%; height: 100%; object-fit: cover; }
.hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(8, 15, 11, 0.6) 0%, rgba(8, 15, 11, 0.28) 42%, rgba(8, 15, 11, 0.08) 70%),
    linear-gradient(180deg, rgba(15, 26, 20, 0.3) 0%, rgba(15, 26, 20, 0.22) 35%, rgba(15, 26, 20, 0.82) 100%);
}

.hero__content {
  width: 100%;
  padding: 0 var(--gutter) clamp(4rem, 9vw, 7rem);
}
.hero__mark {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  letter-spacing: 0.4em;
  color: var(--color-text-on-dark-muted);
  margin-bottom: 2rem;
}
.hero__headline {
  font-size: clamp(2rem, 5vw, 3.6rem);
  line-height: 1.55;
  max-width: 16ch;
  font-weight: 500;
  color: var(--color-text-on-dark);
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.25);
}
.hero__sub {
  margin-top: 2rem;
  max-width: 40ch;
  font-size: 1rem;
  color: var(--color-text-on-dark-muted);
  line-height: 2;
}
.hero__actions { margin-top: 2.75rem; display: flex; gap: 1rem; flex-wrap: wrap; }

.hero__scroll {
  position: absolute;
  right: var(--gutter);
  bottom: 2.5rem;
  display: flex;
  align-items: center;
  gap: 0.9rem;
  color: var(--color-text-on-dark-muted);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
}
.hero__scroll-line {
  width: 1px;
  height: 46px;
  background: rgba(244, 241, 230, 0.4);
  position: relative;
  overflow: hidden;
}
.hero__scroll-line::after {
  content: "";
  position: absolute;
  top: -100%; left: 0;
  width: 100%; height: 100%;
  background: var(--color-text-on-dark);
  animation: scrollLine 2.2s ease-in-out infinite;
}
@keyframes scrollLine {
  0% { top: -100%; }
  60% { top: 100%; }
  100% { top: 100%; }
}

/* ==========================================================================
   Generic section spacing
   ========================================================================== */
section { position: relative; }
section[id] { scroll-margin-top: 88px; }
.section-pad { padding-block: clamp(5rem, 10vw, 9rem); }

/* ---- Intro / Philosophy ---- */
.intro {
  background: var(--color-bg);
  text-align: center;
}
.intro .container { display: flex; flex-direction: column; align-items: center; }
.intro__heading {
  font-size: clamp(1.7rem, 3.4vw, 2.6rem);
  line-height: 1.75;
  max-width: 18ch;
}
.intro__body {
  margin-top: 2rem;
  max-width: 42ch;
  color: var(--color-text-muted);
}
.intro__divider {
  width: 1px;
  height: 64px;
  background: var(--color-border);
  margin-bottom: 2.5rem;
}

/* ---- Brand story ---- */
.story { background: var(--color-bg-alt); overflow: hidden; }
.story .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: clamp(2.5rem, 6vw, 6rem);
}
.story__media { position: relative; }
.story__media-main {
  aspect-ratio: 4 / 5;
  overflow: hidden;
  border-radius: 2px;
}
.story__media-main img { width: 100%; height: 100%; object-fit: cover; }
.story__media-accent {
  position: absolute;
  width: 42%;
  aspect-ratio: 4 / 3;
  bottom: -8%;
  left: -12%;
  border: 8px solid var(--color-bg-alt);
  overflow: hidden;
  box-shadow: 0 20px 45px rgba(20, 30, 24, 0.18);
}
.story__media-accent img { width: 100%; height: 100%; object-fit: cover; }

.story__text .section-heading { max-width: 15ch; }
.story__name {
  margin-top: 2.25rem;
  display: flex;
  gap: 1.5rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.story__name dt {
  font-family: var(--font-serif);
  color: var(--color-green);
  font-size: 0.95rem;
  min-width: 4.5rem;
}
.story__name dd {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.9;
}
.story__body { margin-top: 1.75rem; color: var(--color-text-muted); }

/* ---- Criteria ---- */
.criteria { background: var(--color-bg); }
.criteria__head { max-width: 640px; margin-inline: auto; text-align: center; }
.criteria__head .section-lede { margin-inline: auto; }
.criteria__grid {
  margin-top: clamp(3rem, 6vw, 5rem);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--color-border);
  border-left: 1px solid var(--color-border);
}
.criteria__item {
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 2.75rem 2rem;
  transition: background var(--transition-base);
}
.criteria__item:hover { background: var(--color-bg-alt); }
.criteria__num {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  color: var(--color-green-light);
  letter-spacing: 0.1em;
}
.criteria__icon { margin: 1.75rem 0; width: 34px; height: 34px; color: var(--color-green); }
.criteria__title {
  font-size: 1.05rem;
  line-height: 1.6;
}
.criteria__desc {
  margin-top: 0.9rem;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.9;
}

/* ---- Signature product ---- */
.signature {
  background: var(--color-bg-dark);
  color: var(--color-text-on-dark);
}
.signature .container {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  min-height: 88vh;
  align-items: stretch;
  gap: 0;
  padding-inline: 0;
  max-width: none;
}
.signature__media { position: relative; overflow: hidden; }
.signature__media img { width: 100%; height: 100%; object-fit: cover; min-height: 420px; }
.signature__media-caption {
  position: absolute;
  left: 2.5rem;
  bottom: 2.5rem;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--color-text-on-dark-muted);
  max-width: 20ch;
  line-height: 1.8;
}
.signature__text {
  padding: clamp(3rem, 6vw, 6rem) var(--gutter);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.signature__heading {
  font-size: clamp(1.8rem, 3.2vw, 2.7rem);
  line-height: 1.7;
  color: var(--color-text-on-dark);
  max-width: 15ch;
}
.signature__body {
  margin-top: 2rem;
  color: var(--color-text-on-dark-muted);
  max-width: 42ch;
}
.signature__facts {
  margin-top: 2.75rem;
  display: grid;
  grid-template-columns: repeat(3, auto);
  gap: 2.5rem;
}
.signature__fact dt {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--color-text-on-dark-muted);
  margin-bottom: 0.6rem;
}
.signature__fact dd {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  color: var(--color-text-on-dark);
}
.signature__actions { margin-top: 3rem; }

/* ---- Lineup ---- */
.lineup { background: var(--color-bg); }
.lineup__head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 2rem;
  flex-wrap: wrap;
}
.lineup__grid {
  margin-top: clamp(3rem, 6vw, 5rem);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}
.lineup__card { position: relative; }
.lineup__card-media {
  aspect-ratio: 4 / 5;
  overflow: hidden;
  border-radius: 2px;
  position: relative;
}
.lineup__card-media img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}
.lineup__card:hover .lineup__card-media img { transform: scale(1.06); }
.lineup__badge {
  position: absolute;
  top: 1rem; left: 1rem;
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  padding: 0.4rem 0.85rem;
  background: rgba(251, 250, 247, 0.88);
  color: var(--color-green);
  border-radius: 999px;
}
.lineup__card-title {
  margin-top: 1.1rem;
  font-family: var(--font-serif);
  font-size: 1.05rem;
}
.lineup__card-desc {
  margin-top: 0.4rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ---- Promise / closing ---- */
.promise {
  background: var(--color-green);
  color: var(--color-text-on-dark);
  text-align: center;
  overflow: hidden;
}
.promise .container { display: flex; flex-direction: column; align-items: center; }
.promise__heading {
  font-size: clamp(1.8rem, 3.6vw, 2.8rem);
  color: var(--color-text-on-dark);
  max-width: 18ch;
  line-height: 1.7;
}
.promise__body {
  margin-top: 1.75rem;
  max-width: 44ch;
  color: var(--color-text-on-dark-muted);
}
.promise__actions { margin-top: 2.75rem; display: flex; gap: 1rem; flex-wrap: wrap; justify-content: center; }

.newsletter {
  margin-top: 4.5rem;
  padding-top: 3.5rem;
  border-top: 1px solid rgba(244, 241, 230, 0.2);
  width: 100%;
  max-width: 520px;
}
.newsletter__label {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--color-text-on-dark-muted);
  margin-bottom: 1.25rem;
}
.newsletter__form {
  display: flex;
  border-bottom: 1px solid rgba(244, 241, 230, 0.45);
  padding-bottom: 0.75rem;
}
.newsletter__form input {
  flex: 1;
  background: none;
  border: none;
  color: var(--color-text-on-dark);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  padding: 0.4rem 0;
  outline: none;
}
.newsletter__form input::placeholder { color: var(--color-text-on-dark-muted); }
.newsletter__form button {
  background: none;
  border: none;
  color: var(--color-text-on-dark);
  display: flex;
  align-items: center;
}
.newsletter__form button svg { width: 20px; height: 20px; transition: transform var(--transition-base); }
.newsletter__form button:hover svg { transform: translateX(4px); }
.newsletter__note {
  margin-top: 1rem;
  font-size: 0.75rem;
  color: var(--color-text-on-dark-muted);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--color-bg-dark);
  color: var(--color-text-on-dark-muted);
  padding-top: clamp(4rem, 7vw, 6rem);
}
.site-footer .container {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 3rem;
  padding-bottom: 4rem;
  border-bottom: 1px solid rgba(244, 241, 230, 0.14);
}
.footer__brand .logo { color: var(--color-text-on-dark); margin-bottom: 1.25rem; }
.footer__brand p { max-width: 32ch; font-size: 0.88rem; line-height: 1.95; }
.footer__social { display: flex; gap: 1rem; margin-top: 1.75rem; }
.footer__social a {
  width: 36px; height: 36px;
  border: 1px solid rgba(244, 241, 230, 0.25);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  transition: border-color var(--transition-base), background var(--transition-base);
}
.footer__social a:hover { background: rgba(244, 241, 230, 0.1); border-color: rgba(244, 241, 230, 0.5); }
.footer__social svg { width: 15px; height: 15px; }

.footer__col-title {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--color-text-on-dark);
  margin-bottom: 1.5rem;
}
.footer__col ul { display: flex; flex-direction: column; gap: 0.9rem; }
.footer__col a { font-size: 0.88rem; transition: color var(--transition-base); }
.footer__col a:hover { color: var(--color-text-on-dark); }

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  padding-block: 1.75rem;
  font-size: 0.78rem;
}
.footer__bottom-links { display: flex; gap: 1.75rem; }

/* ==========================================================================
   Scroll reveal
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 1s cubic-bezier(0.22, 1, 0.36, 1), transform 1s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.12s; }
.reveal-delay-2 { transition-delay: 0.24s; }
.reveal-delay-3 { transition-delay: 0.36s; }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1080px) {
  .criteria__grid { grid-template-columns: repeat(2, 1fr); }
  .lineup__grid { grid-template-columns: repeat(2, 1fr); }
  .signature__facts { grid-template-columns: repeat(3, auto); gap: 1.75rem; }
  .site-footer .container { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px) {
  .main-nav__links { display: none; }
  .nav-toggle { display: flex; }

  .story .container { grid-template-columns: 1fr; }
  .story__media { margin-bottom: 3rem; }
  .story__media-accent { width: 55%; left: -6%; }

  .signature .container { grid-template-columns: 1fr; }
  .signature__media img { min-height: 320px; }
}

@media (max-width: 640px) {
  .criteria__grid { grid-template-columns: 1fr; }
  .lineup__grid { grid-template-columns: 1fr; }
  .signature__facts { grid-template-columns: repeat(2, auto); }
  .site-footer .container { grid-template-columns: 1fr; }
  .footer__bottom { flex-direction: column; align-items: flex-start; }
  .hero__actions { flex-direction: column; align-items: flex-start; }
}