/* ============================================================
   ZENobira Co., Ltd. — The First Letter
   style.css
   ------------------------------------------------------------
   A quiet, editorial layout. Typography leads; white space
   is part of the design. No gradients, shadows, or radius.
   ============================================================ */

/* ------------------------------------------------------------
   1. DESIGN TOKENS
   ------------------------------------------------------------ */
:root {
  /* Color */
  --color-white: #ffffff;
  --color-black: #1a1a1a;
  --color-wine: #6a1f2b;
  --color-border: #ececec;
  --color-muted: #6f6f6f;
  --color-overlay: rgba(26, 26, 26, 0.34);

  /* Type families */
  --font-display: "Cormorant Garamond", "Noto Serif JP", serif;
  --font-jp: "Noto Serif JP", serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  /* Fluid type scale */
  --fs-hero: clamp(3.4rem, 9vw, 7.5rem);
  --fs-display: clamp(2.2rem, 5vw, 3.6rem);
  --fs-heading: clamp(1.9rem, 4vw, 2.9rem);
  --fs-word: clamp(1.6rem, 3vw, 2.3rem);
  --fs-lead: clamp(1.15rem, 2.4vw, 1.5rem);
  --fs-body: clamp(0.98rem, 1.4vw, 1.06rem);
  --fs-caption: 0.78rem;

  /* Layout */
  --max-width: 1200px;
  --gutter: 24px;
  --section-space: clamp(6rem, 14vw, 12rem);
  --header-height: 96px;

  /* Motion */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --speed: 0.25s;
  --reveal-speed: 0.8s;
}

/* ------------------------------------------------------------
   2. RESET / BASE
   ------------------------------------------------------------ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--color-white);
  color: var(--color-black);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

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

h1,
h2,
h3,
p,
ul,
figure,
address {
  margin: 0;
}

ul {
  list-style: none;
  padding: 0;
}

button {
  font-family: inherit;
  cursor: pointer;
}

/* ------------------------------------------------------------
   3. UTILITIES
   ------------------------------------------------------------ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  top: -60px;
  left: 16px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--color-black);
  color: var(--color-white);
  font-size: var(--fs-caption);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transition: top var(--speed) var(--ease);
}

.skip-link:focus {
  top: 16px;
}

/* Shared section labels */
.section__eyebrow {
  font-family: var(--font-body);
  font-size: var(--fs-caption);
  font-weight: 500;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--color-wine);
}

.section__heading {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--fs-heading);
  line-height: 1.1;
  letter-spacing: 0.03em;
}

/* Focus visibility (accessibility) */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-wine);
  outline-offset: 3px;
}

/* ------------------------------------------------------------
   4. HEADER / NAVIGATION
   Transparent over hero → white after scroll
   ------------------------------------------------------------ */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
  border-bottom: 1px solid transparent;
  transition: background var(--speed) var(--ease),
    border-color var(--speed) var(--ease), color var(--speed) var(--ease);
}

/* Over the hero */
.site-header[data-state="top"] {
  background: transparent;
  color: var(--color-white);
}

/* After scrolling past the hero */
.site-header[data-state="scrolled"] {
  background: var(--color-white);
  color: var(--color-black);
  border-bottom-color: var(--color-border);
}

.nav {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__brand {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: 0.06em;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: clamp(1.4rem, 3vw, 2.6rem);
}

.nav__link {
  position: relative;
  font-size: 0.82rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding-block: 6px;
  transition: color var(--speed) var(--ease);
}

/* Understated underline that fades in on hover / active */
.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  opacity: 0;
  transition: opacity var(--speed) var(--ease);
}

.nav__link:hover,
.nav__link.is-active {
  color: var(--color-wine);
}

.nav__link:hover::after,
.nav__link.is-active::after {
  opacity: 1;
}

/* Mobile toggle */
.nav__toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: transparent;
  border: 0;
  padding: 0;
}

.nav__toggle-bar {
  display: block;
  width: 24px;
  height: 1px;
  background: currentColor;
  transition: transform var(--speed) var(--ease),
    opacity var(--speed) var(--ease);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(1) {
  transform: translateY(3.5px) rotate(45deg);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(2) {
  transform: translateY(-3.5px) rotate(-45deg);
}

/* ------------------------------------------------------------
   5. HERO
   ------------------------------------------------------------ */
.hero {
  position: relative;
  isolation: isolate; /* contain the background image layer */
  height: 100vh;
  min-height: 560px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--color-white);
  overflow: hidden;
}

.hero__media {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.hero__image {
  width: 100%;
  height: 100%;
  /* Composition nudged left so the typography has more breathing room */
  object-position: 38% center;
}

/* Soft, even veil so text stays legible without HDR contrast */
.hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--color-overlay);
}

.hero__inner {
  padding-inline: var(--gutter);
}

.hero__title {
  font-family: var(--font-display);
  font-weight: 400; /* slightly heavier */
  font-size: var(--fs-hero);
  line-height: 1;
  letter-spacing: 0.03em;
  /* 48–64px of breathing room before the caption */
  margin-bottom: clamp(48px, 5vw, 64px);
}

.hero__caption {
  font-family: var(--font-body);
  font-size: 0.55rem; /* ~30% smaller */
  font-weight: 400;
  letter-spacing: 0.38em;
  text-transform: uppercase;
  margin-bottom: 24px;
  opacity: 0.62; /* quieter presence */
}

.hero__message {
  font-family: var(--font-jp);
  font-weight: 300;
  font-size: var(--fs-lead);
  letter-spacing: 0.22em;
  line-height: 2;
}

/* Scroll indicator — a thin vertical line with a small arrow */
.hero__scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  width: 16px;
  height: 64px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero__scroll-line {
  width: 1px;
  height: 46px;
  background: var(--color-white);
}

.hero__scroll-arrow {
  width: 8px;
  height: 8px;
  margin-top: -1px;
  border-right: 1px solid var(--color-white);
  border-bottom: 1px solid var(--color-white);
  transform: rotate(45deg);
}

/* ------------------------------------------------------------
   6. ESSENCE
   ------------------------------------------------------------ */
.essence__grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(3rem, 7vw, 7rem);
  align-items: center;
}

.essence__words {
  margin-top: 2.4rem;
  margin-bottom: 2.8rem;
}

.essence__word {
  font-family: var(--font-display);
  font-size: var(--fs-word);
  font-weight: 400;
  letter-spacing: 0.03em;
  line-height: 1.5;
  color: var(--color-black);
}

.essence__word + .essence__word {
  border-top: 1px solid var(--color-border);
  padding-top: 1.6rem;
  margin-top: 1.6rem;
}

.essence__body {
  font-family: var(--font-jp);
  font-weight: 300;
  line-height: 2;
  letter-spacing: 0.04em;
  color: #2c2c2c;
}

.essence__body p + p {
  margin-top: 1.4rem;
}

.essence__lead {
  display: inline-block;
  min-width: 4.2em;
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.18em;
  color: var(--color-wine);
}

.essence__portrait {
  aspect-ratio: 3 / 4;
  overflow: hidden;
}

.essence__portrait img {
  height: 100%;
}

/* ------------------------------------------------------------
   7. PHILOSOPHY
   ------------------------------------------------------------ */
.philosophy {
  position: relative;
  isolation: isolate; /* contain the background image layer */
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--color-white);
  overflow: hidden;
}

.philosophy__media {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.philosophy__image {
  width: 100%;
  height: 100%;
}

.philosophy__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--color-overlay);
}

.philosophy__inner {
  padding-inline: var(--gutter);
}

.philosophy__text {
  font-family: var(--font-jp);
  font-weight: 300;
  font-size: var(--fs-display);
  line-height: 2;
  letter-spacing: 0.2em;
  margin: 0;
}

/* ------------------------------------------------------------
   8. WHAT WE DO
   ------------------------------------------------------------ */
.wwd__eyebrow {
  display: block;
  margin-bottom: clamp(2.4rem, 5vw, 4rem);
}

.wwd__row {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(1.5rem, 5vw, 5rem);
  align-items: baseline;
  padding-block: clamp(2rem, 4vw, 3.2rem);
  border-top: 1px solid var(--color-border);
}

.wwd__list .wwd__row:last-child {
  border-bottom: 1px solid var(--color-border);
}

.wwd__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--fs-display);
  line-height: 1.1;
  letter-spacing: 0.03em;
  transition: color var(--speed) var(--ease);
}

.wwd__desc {
  font-family: var(--font-jp);
  font-weight: 300;
  line-height: 2;
  letter-spacing: 0.06em;
  color: #3a3a3a;
  transition: color var(--speed) var(--ease);
}

/* Hover — text turns Deep Wine Red; dividers stay unchanged */
.wwd__row:hover .wwd__title,
.wwd__row:hover .wwd__desc {
  color: var(--color-wine);
}

/* ------------------------------------------------------------
   9. PARTNERSHIPS
   ------------------------------------------------------------ */
.partnerships {
  padding-block: 0 var(--section-space);
}

.partnerships__media {
  width: 100%;
  height: clamp(55vh, 69vh, 80vh); /* ~15% larger */
  margin-bottom: var(--section-space);
  overflow: hidden;
}

.partnerships__media img {
  height: 100%;
}

.partnerships__body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2.5rem, 6vw, 6rem);
  align-items: start;
}

.partnerships__heading,
.partnerships .section__heading {
  grid-column: 1 / -1;
  margin-bottom: 0.5rem;
}

.partnerships__text {
  font-family: var(--font-jp);
  font-weight: 300;
  line-height: 2;
  letter-spacing: 0.05em;
  color: #2c2c2c;
}

.partnerships__text p + p {
  margin-top: 1.4rem;
}

/* Editorial feature — text only, no badge, no logo wall */
.partnerships__feature {
  border-left: 1px solid var(--color-border);
  padding-left: clamp(1.6rem, 3vw, 2.6rem);
}

.partnerships__feature-label {
  font-size: var(--fs-caption);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-wine);
  margin-bottom: 1rem;
}

.partnerships__feature-name {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.2;
  margin-bottom: 1.2rem;
}

.partnerships__feature-note {
  font-size: 0.92rem;
  line-height: 1.9;
  color: var(--color-muted);
  margin-bottom: 1.4rem;
}

.partnerships__feature-press {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.partnerships__feature-press-label {
  font-size: var(--fs-caption);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.partnerships__feature-press-name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  letter-spacing: 0.06em;
  color: var(--color-black);
}

/* ------------------------------------------------------------
   10. LETTER
   ------------------------------------------------------------ */
.letter {
  background: var(--color-white);
}

/* Editorial reading layout — a single, centred column with air */
.letter__grid {
  display: block;
  max-width: 680px;
  margin-inline: auto;
  text-align: center;
}

.letter__portrait {
  width: min(200px, 56%);
  aspect-ratio: 3 / 4;
  margin: 0 auto clamp(2.4rem, 5vw, 3.6rem);
  overflow: hidden;
}

.letter__portrait img {
  height: 100%;
}

.letter__content {
  text-align: left;
}

.letter #letter-heading {
  text-align: center;
}

.letter__subheading {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.25rem, 2.4vw, 1.7rem);
  letter-spacing: 0.04em;
  color: var(--color-wine);
  text-align: center;
  margin-top: 1rem;
  margin-bottom: clamp(3rem, 7vw, 5rem);
}

.letter__body {
  min-height: 3rem;
  font-family: var(--font-jp);
  font-weight: 300;
  font-size: 1.08rem;
  line-height: 2.3;
  letter-spacing: 0.06em;
  color: #2c2c2c;
}

.letter__body p + p {
  margin-top: 1.8rem;
}

.letter__sign {
  margin-top: clamp(3rem, 6vw, 4.5rem);
  font-family: var(--font-display);
  font-size: 1.5rem;
  letter-spacing: 0.06em;
  text-align: right;
}

/* ------------------------------------------------------------
   10b. JOURNAL  (placeholder)
   ------------------------------------------------------------ */
.journal {
  background: var(--color-white);
  border-top: 1px solid var(--color-border);
}

.journal__inner {
  text-align: center;
}

.journal__note {
  margin-top: 1.6rem;
  font-family: var(--font-body);
  font-size: 0.82rem;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--color-muted);
}



/* ------------------------------------------------------------
   11. CONTACT
   ------------------------------------------------------------ */
.contact {
  position: relative;
  isolation: isolate; /* contain the background image layer */
  padding-block: var(--section-space);
  color: var(--color-white);
  overflow: hidden;
}

.contact__media {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.contact__image {
  width: 100%;
  height: 100%;
}

.contact__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(26, 26, 26, 0.5);
}

.contact__inner {
  max-width: 640px;
}

.contact__heading {
  color: var(--color-white);
  margin-bottom: clamp(3rem, 6vw, 4.5rem);
}

.contact__form {
  display: flex;
  flex-direction: column;
  gap: 2.6rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.field__label {
  font-size: var(--fs-caption);
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.field__input {
  width: 100%;
  padding: 0.85rem 0;
  background: transparent;
  border: 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.5);
  color: var(--color-white);
  font-family: var(--font-body);
  font-size: 1rem;
  transition: border-color var(--speed) var(--ease);
}

.field__input::placeholder {
  color: rgba(255, 255, 255, 0.6);
}

.field__input:focus {
  outline: none;
  border-bottom-color: var(--color-white);
}

.field__textarea {
  resize: vertical;
  min-height: 120px;
}

/* Button — transparent, 1px border, wine on hover */
.btn {
  align-self: flex-start;
  margin-top: 1rem;
  padding: 0.72rem 2.1rem;
  background: transparent;
  border: 1px solid currentColor;
  color: inherit;
  font-family: var(--font-body);
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  transition: background var(--speed) var(--ease),
    border-color var(--speed) var(--ease), color var(--speed) var(--ease);
}

.btn:hover,
.btn:focus-visible {
  background: var(--color-wine);
  border-color: var(--color-wine);
  color: var(--color-white);
}

/* ------------------------------------------------------------
   12. FOOTER
   ------------------------------------------------------------ */
.site-footer {
  background: var(--color-white);
  border-top: 1px solid var(--color-border);
  padding-block: clamp(4rem, 8vw, 6rem);
}

.site-footer__inner {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  text-align: center;
}

.site-footer__name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: 0.06em;
}

.site-footer__address {
  font-style: normal;
  font-family: var(--font-jp);
  font-weight: 300;
  line-height: 1.9;
  color: var(--color-muted);
}

.site-footer__copy {
  font-size: var(--fs-caption);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.site-footer__grace {
  margin-top: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.site-footer__grace [lang="ja"] {
  font-family: var(--font-jp);
  font-weight: 400;
  font-size: 1.225rem; /* +2px */
  letter-spacing: 0.18em;
}

.site-footer__grace-en {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.125rem; /* +2px */
  letter-spacing: 0.04em;
  color: var(--color-muted);
}

.site-footer__grace-mark {
  margin-top: 1.4rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.35rem;
  letter-spacing: 0.14em;
  color: var(--color-black);
}

/* ------------------------------------------------------------
   13. MOTION — fade-in / reveal on scroll
   ------------------------------------------------------------ */
.fade-in {
  opacity: 0;
  transform: translateY(10px);
  animation: fade-up var(--reveal-speed) var(--ease) forwards;
}

.fade-in:nth-child(1) { animation-delay: 0.1s; }
.fade-in:nth-child(2) { animation-delay: 0.25s; }
.fade-in:nth-child(3) { animation-delay: 0.4s; }
.hero__scroll.fade-in { animation-delay: 0.6s; }

@keyframes fade-up {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity var(--reveal-speed) var(--ease),
    transform var(--reveal-speed) var(--ease);
}

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

/* ------------------------------------------------------------
   14. RESPONSIVE
   Breakpoints: 1440 · 1200 · 992 · 768 · 480
   ------------------------------------------------------------ */
@media (max-width: 1440px) {
  :root {
    --section-space: clamp(6rem, 12vw, 11rem);
  }
}

@media (max-width: 1200px) {
  :root {
    --gutter: 32px;
  }
}

@media (max-width: 992px) {
  .essence__grid,
  .partnerships__body {
    grid-template-columns: 1fr;
  }

  .essence__portrait {
    max-width: 460px;
  }

  .partnerships__feature {
    border-left: 0;
    border-top: 1px solid var(--color-border);
    padding-left: 0;
    padding-top: 2rem;
  }
}

@media (max-width: 768px) {
  :root {
    --gutter: 22px;
    --header-height: 68px;
  }

  /* Collapse nav into a panel */
  .nav__toggle {
    display: flex;
  }

  .nav__menu {
    position: fixed;
    inset: var(--header-height) 0 auto 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--color-white);
    color: var(--color-black);
    border-bottom: 1px solid var(--color-border);
    padding: 8px var(--gutter) 24px;
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--speed) var(--ease),
      opacity var(--speed) var(--ease);
  }

  .nav__menu.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav__menu li {
    width: 100%;
    border-top: 1px solid var(--color-border);
  }

  .nav__link {
    display: block;
    width: 100%;
    padding-block: 16px;
    color: var(--color-black);
  }

  .nav__link::after {
    display: none;
  }

  .wwd__row {
    grid-template-columns: 1fr;
    gap: 0.8rem;
  }

  .essence__lead {
    min-width: 3.6em;
  }
}

@media (max-width: 480px) {
  :root {
    --gutter: 18px;
  }

  .hero__caption {
    letter-spacing: 0.32em;
  }

  .hero__message,
  .philosophy__text {
    letter-spacing: 0.14em;
  }

  .btn {
    width: 100%;
    text-align: center;
  }
}

/* ------------------------------------------------------------
   15. REDUCED MOTION
   ------------------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .fade-in,
  .reveal {
    opacity: 1;
    transform: none;
  }
}