/* MELUVIRA — shared stylesheet
   Clean, quiet, minimal, product-focused. One stylesheet, no framework. */

:root {
  /* Logo-derived teal palette (2026-10-14, pending Owner visual review).
     Source: colors measured from the MELUVIRA logo's icon mark (favicon /
     apple-touch-icon) — teal #1b6b6f, lavender #9293bd, light gray
     #e1e2e2, background #fafaf9. Only custom-property VALUES changed;
     every class/structure below is untouched. Focus ring uses a darker
     shade of the logo lavender so it keeps >= 3:1 against the background. */
  --color-bg: #fafaf9;
  --color-surface: #ffffff;
  --color-surface-muted: #eef2f2;
  --color-text: #1d2b2c;
  --color-text-muted: #4f5f60;
  --color-border: #e1e2e2;
  --color-accent: #1b6b6f;
  --color-accent-contrast: #ffffff;
  --color-focus: #6f70a3;
  --color-accent-tint: #9293bd;

  --font-sans: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN",
    "Noto Sans JP", "Segoe UI", Roboto, sans-serif;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 6rem;

  --max-width: 72rem;
  --max-width-text: 42rem;

  --radius: 0.75rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #121a1b;
    --color-surface: #182324;
    --color-surface-muted: #1e2b2c;
    --color-text: #eaf0ef;
    --color-text-muted: #a3b3b2;
    --color-border: #2b3a3b;
    --color-accent: #6cc0c3;
    --color-accent-contrast: #0f1718;
    --color-focus: #b7b8de;
    --color-accent-tint: #2e2f47;
  }
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-accent);
}

a:not(.button) {
  text-underline-offset: 0.2em;
}

/* Visible, consistent focus state everywhere — never removed, only restyled. */
:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -3rem;
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  padding: var(--space-1) var(--space-2);
  border-radius: 0 0 8px 8px;
  z-index: 100;
  transition: top 0.15s ease;
}

.skip-link:focus {
  top: 0;
}

.container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-2);
}

@media (min-width: 48rem) {
  .container {
    padding-inline: var(--space-4);
  }
}

/* ---------------------------------------------------------------- */
/* Header / navigation                                               */
/* ---------------------------------------------------------------- */

.site-header {
  position: relative;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-2);
  gap: var(--space-2);
}

.site-logo {
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: 0.02em;
  color: var(--color-text);
  text-decoration: none;
  white-space: nowrap;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  cursor: pointer;
}

.nav-toggle__icon,
.nav-toggle__icon::before,
.nav-toggle__icon::after {
  display: block;
  width: 1.25rem;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
}

.nav-toggle__icon {
  position: relative;
}

.nav-toggle__icon::before,
.nav-toggle__icon::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle__icon::before {
  top: -6px;
}

.nav-toggle__icon::after {
  top: 6px;
}

/* Mobile: the nav is a dropdown panel anchored to the header, not part of
   the bar's own row flow — this is what lets the logo+toggle row stay a
   single tidy line while the open menu overlays below it rather than
   pushing page content down. */
.site-nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 8px 16px -12px rgb(0 0 0 / 0.2);
}

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

.site-nav__list {
  list-style: none;
  margin: 0;
  padding: var(--space-2);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.site-nav__list a {
  display: block;
  padding: var(--space-2);
  border-radius: 0.5rem;
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
}

.site-nav__list a:hover {
  background: var(--color-surface-muted);
}

.site-nav__list a[aria-current="page"] {
  color: var(--color-accent);
  text-decoration: underline;
}

/* Desktop / tablet-wide: nav becomes a normal inline row, hamburger hidden.
   Chosen deliberately wide (60rem / 960px) so the collapsed menu stays in
   use through 768px tablet width, which is exactly the breakpoint the Wix
   reference site's navigation broke at. */
@media (min-width: 60rem) {
  .nav-toggle {
    display: none;
  }

  .site-nav {
    display: block;
    position: static;
    background: transparent;
    border-bottom: 0;
    box-shadow: none;
  }

  .site-nav__list {
    flex-direction: row;
    padding: 0;
    gap: var(--space-3);
  }

  .site-nav__list a {
    padding: var(--space-1) 0.25rem;
  }
}

/* ---------------------------------------------------------------- */
/* Hero                                                               */
/* ---------------------------------------------------------------- */

.hero {
  background: linear-gradient(135deg, var(--color-surface-muted), var(--color-bg) 70%);
  padding-block: var(--space-5) var(--space-6);
}

.hero__eyebrow {
  margin: 0 0 var(--space-1);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.hero h1 {
  margin: 0 0 var(--space-2);
  font-size: clamp(1.75rem, 1.2rem + 2.2vw, 2.75rem);
  line-height: 1.25;
  max-width: 24ch;
}

/* Heading Layout Fix (Owner request): `ch` is defined by the width of "0" in
   the current font, which is a reasonable column-width unit for Latin text
   but is roughly half the width of a CJK full-width character -- so the same
   24ch that reads as one comfortable line in English wraps Japanese onto two
   lines well before the container's own width becomes the real constraint.
   Scoped to :lang(ja) only, so an eventual English/other-language hero keeps
   its original 24ch behavior untouched. `em` (not a fixed px/rem) is used so
   this scales together with the h1's own clamp()-based font-size: on narrow
   viewports the font shrinks and this shrinks with it, letting the
   .container's actual width become the binding constraint again and wrap
   naturally -- no media query or `white-space: nowrap` needed. */
html[lang="ja"] .hero h1 {
  max-width: 19em;
}

.hero p {
  max-width: var(--max-width-text);
  color: var(--color-text-muted);
  font-size: 1.0625rem;
}

/* ---------------------------------------------------------------- */
/* Buttons / links                                                   */
/* ---------------------------------------------------------------- */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.6rem 1.4rem;
  border-radius: 999px;
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
}

.button:hover {
  opacity: 0.92;
}

.button--secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

/* ---------------------------------------------------------------- */
/* Sections                                                           */
/* ---------------------------------------------------------------- */

section {
  padding-block: var(--space-5);
}

section + section {
  border-top: 1px solid var(--color-border);
}

.section-heading {
  margin: 0 0 var(--space-3);
  font-size: clamp(1.375rem, 1.1rem + 1vw, 1.75rem);
}

.section-intro {
  max-width: var(--max-width-text);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

/* ---------------------------------------------------------------- */
/* Feature / step list — numbers stay structurally inside each item  */
/* ---------------------------------------------------------------- */

.feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
  grid-template-columns: 1fr;
}

@media (min-width: 40rem) {
  .feature-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 60rem) {
  .feature-list {
    grid-template-columns: repeat(4, 1fr);
  }
}

.feature-list__item {
  padding: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.feature-list__index {
  display: block;
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--color-accent);
  margin-bottom: var(--space-1);
}

.feature-list__item h3 {
  margin: 0 0 0.4rem;
  font-size: 1.0625rem;
}

.feature-list__item p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

/* Privacy-style 2-column numbered principle list (same grouping rule) */
.principle-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
  grid-template-columns: 1fr;
}

@media (min-width: 40rem) {
  .principle-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

.principle-list__item {
  padding: var(--space-3);
  border-radius: var(--radius);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.principle-list__index {
  display: block;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: var(--space-1);
}

.principle-list__item h2,
.principle-list__item h3 {
  margin: 0 0 0.4rem;
  font-size: 1.0625rem;
}

.principle-list__item p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

/* ---------------------------------------------------------------- */
/* Data-management card (quiet gradient panel, Wix "データ管理" section) */
/* ---------------------------------------------------------------- */

.panel {
  background: linear-gradient(135deg, var(--color-surface-muted), var(--color-bg));
  border-radius: var(--radius);
  padding: var(--space-4);
}

.panel__groups {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-3);
}

@media (min-width: 40rem) {
  .panel__groups {
    grid-template-columns: repeat(3, 1fr);
  }
}

.panel__group h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  letter-spacing: 0.02em;
}

.panel__group p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

/* ---------------------------------------------------------------- */
/* Link cards (Home -> Support / Privacy)                             */
/* ---------------------------------------------------------------- */

.card-grid {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: 1fr;
}

@media (min-width: 40rem) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
}

.card h2 {
  margin: 0;
  font-size: 1.25rem;
}

.card p {
  margin: 0;
  color: var(--color-text-muted);
  flex-grow: 1;
}

.card .button {
  align-self: flex-start;
}

/* ---------------------------------------------------------------- */
/* Disclaimer / closing note (dark quiet band, Wix "サポートと大切なこと") */
/* ---------------------------------------------------------------- */

.note {
  background: var(--color-surface-muted);
  border-radius: var(--radius);
  padding: var(--space-4);
}

.note h2 {
  margin-top: 0;
}

.note p {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

/* ---------------------------------------------------------------- */
/* Simple content section (Privacy page) */
/* ---------------------------------------------------------------- */

.content-section + .content-section {
  margin-top: var(--space-4);
}

.content-section h2 {
  font-size: 1.1875rem;
  margin: 0 0 var(--space-1);
}

.content-section p {
  margin: 0;
  color: var(--color-text-muted);
  max-width: var(--max-width-text);
}

/* ---------------------------------------------------------------- */
/* App screenshots — real captures from the Simulator, never mockups */
/* ---------------------------------------------------------------- */

.app-shot {
  display: block;
  width: 100%;
  aspect-ratio: 303 / 660;
  object-fit: cover;
  object-position: top center;
  border-radius: 1.25rem;
  border: 1px solid var(--color-border);
  box-shadow: 0 16px 32px -20px rgb(0 0 0 / 0.28);
  background: var(--color-surface);
}

.shot-grid {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(2, 1fr);
}

@media (min-width: 40rem) {
  .shot-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.shot-grid figure {
  margin: 0;
}

.shot-grid .app-shot {
  max-width: 11rem;
  margin-inline: auto;
}

.shot-grid figcaption {
  margin-top: var(--space-1);
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.feature-list__item .app-shot {
  max-width: 9rem;
  margin: 0 0 var(--space-2);
}

/* ---------------------------------------------------------------- */
/* Footer                                                             */
/* ---------------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-4);
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.site-footer__bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: space-between;
  align-items: center;
}

.site-footer a {
  color: inherit;
}

/* ---------------------------------------------------------------- */
/* Utility                                                            */
/* ---------------------------------------------------------------- */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition-duration: 0.01ms !important;
  }
}

/* Keep the layout inside the screen when only the TEXT is enlarged (e.g.
   200% text size on a phone). A plain `1fr` grid track cannot shrink below
   its content's min-content width, so a large word such as "MELUVIRA" or a
   long e-mail address pushed cards, feature items and screenshots past the
   right edge. `minmax(0, 1fr)` lets the tracks shrink, and `overflow-wrap:
   anywhere` lets an over-long word wrap instead. Column counts and
   breakpoints are exactly those above; at normal text sizes nothing is
   wider than its track, so nothing moves. */
.feature-list,
.principle-list,
.card-grid { grid-template-columns: minmax(0, 1fr); }
.shot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (min-width: 40rem) {
  .feature-list,
  .principle-list,
  .card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .shot-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .panel__groups { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (min-width: 60rem) {
  .feature-list { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
.feature-list > *,
.principle-list > *,
.card-grid > *,
.shot-grid > *,
.panel__groups > * { min-width: 0; }
.feature-list__item,
.card,
.shot-grid figcaption,
a[href^="mailto:"] { overflow-wrap: anywhere; }

/* Keep short Japanese phrases together so the lead line breaks only after "、" on narrow screens. */
.phrase {
  display: inline-block;
}