@import url('https://fonts.googleapis.com/css2?family=Zen+Old+Mincho:wght@400;500;700&family=Zen+Kaku+Gothic+New:wght@300;400;500;700&family=Lora:ital,wght@0,400;0,500;1,400&display=swap');

:root {
  --ink: #231815;
  --ink-soft: #4a423f;
  --gray-700: #6b645f;
  --gray-500: #9a938d;
  --gray-300: #d8d3cd;
  --gray-100: #f2f0ec;
  --gray-050: #f8f7f4;
  --white: #ffffff;
  --border: #e2ddd6;

  --font-jp-heading: 'Zen Old Mincho', serif;
  --font-jp-body: 'Zen Kaku Gothic New', 'Hiragino Sans', sans-serif;
  --font-en: 'Lora', serif;

  --max-width: 1120px;
  --gutter: clamp(20px, 5vw, 64px);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-jp-body);
  font-weight: 300;
  color: var(--ink);
  background: var(--white);
  line-height: 1.9;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
}

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

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

h1, h2, h3, h4 {
  font-family: var(--font-jp-heading);
  font-weight: 500;
  margin: 0;
  letter-spacing: 0.06em;
  line-height: 1.6;
}

.en {
  font-family: var(--font-en);
  letter-spacing: 0.04em;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* -------- header -------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px var(--gutter);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}

/* 背景のぼかしは疑似要素側にかける。
   .site-header自体にfilter/backdrop-filterを持たせると、
   position:fixedの子要素（モバイルメニュー）の基準がヘッダーの
   小さな箱に変わってしまい、メニューが画面全体に広がらなくなるため。 */
.site-header::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.site-header.is-scrolled {
  border-bottom-color: var(--border);
}

.site-logo img {
  height: 22px;
  width: auto;
}

.site-nav {
  display: flex;
  gap: clamp(16px, 3vw, 40px);
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.site-nav a {
  position: relative;
  padding-bottom: 4px;
}

.site-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--ink);
  transition: width 0.3s ease;
}

.site-nav a:hover::after,
.site-nav a.is-active::after {
  width: 100%;
}

.nav-toggle {
  display: none;
}

/* -------- hero / parallax -------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--gray-050);
}

.hero-layer {
  position: absolute;
  inset: -10% -5%;
  will-change: transform;
}

.hero-layer-bg {
  background:
    radial-gradient(circle at 18% 28%, var(--gray-100) 0%, transparent 45%),
    radial-gradient(circle at 82% 70%, var(--gray-100) 0%, transparent 50%);
  z-index: 1;
}

.hero-layer-particles {
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.hero-layer-particles canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.hero-layer-lines {
  z-index: 2;
}

.hero-content {
  position: relative;
  z-index: 3;
  width: 100%;
  padding: 0 var(--gutter);
}

.hero-eyebrow {
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: 0.25em;
  color: var(--gray-700);
  margin-bottom: 24px;
}

.hero-copy {
  font-size: clamp(32px, 5.6vw, 64px);
  max-width: 14ch;
}

.hero-sub {
  margin-top: 28px;
  font-family: var(--font-en);
  font-style: italic;
  color: var(--gray-700);
  font-size: clamp(14px, 1.6vw, 18px);
  max-width: 40ch;
}

.hero-scroll {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: 40px;
  z-index: 3;
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gray-500);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.hero-scroll-line {
  width: 1px;
  height: 40px;
  background: var(--gray-500);
  overflow: hidden;
}

.hero-scroll-line::after {
  content: '';
  display: block;
  width: 100%;
  height: 100%;
  background: var(--ink);
  transform: translateY(-100%);
  animation: scroll-line 2.2s ease-in-out infinite;
}

@keyframes scroll-line {
  0% { transform: translateY(-100%); }
  50% { transform: translateY(0); }
  100% { transform: translateY(100%); }
}

/* -------- sections -------- */
section {
  padding: clamp(80px, 12vw, 160px) 0;
}

.section-alt {
  background: var(--gray-050);
}

/* -------- section stacking（次のセクションがせり上がって重なる） -------- */
.stack-section {
  position: sticky;
  top: 0;
  background: var(--white);
}

.stack-section.section-alt {
  background: var(--gray-050);
}

.stack-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--gray-500);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 1s cubic-bezier(0.16, 1, 0.3, 1);
}

.stack-section.is-visible::before {
  transform: scaleX(1);
}

.section-head {
  margin-bottom: clamp(40px, 6vw, 80px);
}

.section-label {
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--gray-500);
  margin-bottom: 16px;
  display: block;
}

.section-title {
  font-size: clamp(24px, 3.2vw, 36px);
}

.lede {
  margin-top: 24px;
  color: var(--ink-soft);
  max-width: 46ch;
  font-weight: 400;
}

/* reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s cubic-bezier(0.16, 1, 0.3, 1), transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* -------- cards / grid -------- */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.card {
  background: var(--white);
  display: flex;
  flex-direction: column;
}

.card-thumb {
  aspect-ratio: 4 / 3;
  background: repeating-linear-gradient(135deg, var(--gray-100) 0px, var(--gray-100) 12px, var(--white) 12px, var(--white) 24px);
  overflow: hidden;
}

.card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.card-body {
  padding: clamp(28px, 4vw, 48px);
}

.card-num {
  font-family: var(--font-en);
  font-size: 13px;
  color: var(--gray-500);
  margin-bottom: 20px;
  display: block;
}

.card-title {
  font-size: 20px;
  margin-bottom: 16px;
}

.card-text {
  color: var(--gray-700);
  font-size: 15px;
  line-height: 1.9;
}

.tag-list {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  font-family: var(--font-en);
  font-size: 12px;
  padding: 6px 14px;
  border: 1px solid var(--border);
  color: var(--gray-700);
  border-radius: 999px;
}

/* -------- stack cards（できること：スクロールでカードが重なっていく） -------- */
.stack-cards {
  position: relative;
}

.stack-card {
  position: sticky;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  margin-bottom: 28px;
}

.stack-card-thumb {
  aspect-ratio: 4 / 3;
  background: repeating-linear-gradient(135deg, var(--gray-100) 0px, var(--gray-100) 12px, var(--white) 12px, var(--white) 24px);
  overflow: hidden;
}

.stack-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.stack-card-body {
  padding: clamp(28px, 4vw, 48px);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.stack-card .card-num {
  margin-bottom: 16px;
}

.stack-card .card-title {
  font-size: 24px;
  margin-bottom: 16px;
}

.stack-card .card-text {
  margin-bottom: 20px;
}

@media (max-width: 720px) {
  .stack-card {
    grid-template-columns: 1fr;
  }
}

/* -------- info table -------- */
.info-table {
  width: 100%;
  border-top: 1px solid var(--border);
}

.info-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}

.info-row dt {
  font-family: var(--font-en);
  font-size: 13px;
  color: var(--gray-500);
  letter-spacing: 0.1em;
}

.info-row dd {
  margin: 0;
  color: var(--ink-soft);
}

/* -------- buttons -------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-en);
  font-size: 14px;
  letter-spacing: 0.06em;
  padding: 16px 32px;
  border: 1px solid var(--ink);
  color: var(--ink);
  background: transparent;
  transition: background 0.3s ease, color 0.3s ease;
}

.btn:hover {
  background: var(--ink);
  color: var(--white);
}

/* ボックスの周りにゆるやかに描かれる縁取り（対角から伸びる4本の線）
   既存の静的なborderと重ならないよう、ボックスの外側に描画する。 */
.btn .border,
.form-submit .border {
  position: absolute;
  opacity: 0;
  pointer-events: none;
  transition: width 1.4s cubic-bezier(0.22, 1, 0.36, 1), height 1.4s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.4s ease;
}

.btn .border.top,
.btn .border.bottom,
.form-submit .border.top,
.form-submit .border.bottom {
  width: 0;
}

.btn .border.top,
.form-submit .border.top {
  border-top: 1px solid var(--ink);
  right: -6px;
  top: -6px;
}

.btn .border.bottom,
.form-submit .border.bottom {
  border-bottom: 1px solid var(--ink);
  left: -6px;
  bottom: -6px;
}

.btn .border.right,
.btn .border.left,
.form-submit .border.right,
.form-submit .border.left {
  height: 0;
}

.btn .border.right,
.form-submit .border.right {
  border-right: 1px solid var(--ink);
  right: -6px;
  top: -6px;
}

.btn .border.left,
.form-submit .border.left {
  border-left: 1px solid var(--ink);
  left: -6px;
  bottom: -6px;
}

.btn.is-animated .border,
.form-submit.is-animated .border {
  opacity: 1;
}

.btn.is-animated .border.top,
.btn.is-animated .border.bottom,
.form-submit.is-animated .border.top,
.form-submit.is-animated .border.bottom {
  width: calc(100% + 12px);
}

.btn.is-animated .border.right,
.btn.is-animated .border.left,
.form-submit.is-animated .border.right,
.form-submit.is-animated .border.left {
  height: calc(100% + 12px);
}

@media (prefers-reduced-motion: reduce) {
  .btn .border,
  .form-submit .border {
    transition: opacity 0.4s ease;
  }
  .btn.is-animated .border.top,
  .btn.is-animated .border.bottom,
  .form-submit.is-animated .border.top,
  .form-submit.is-animated .border.bottom {
    width: calc(100% + 12px);
  }
  .btn.is-animated .border.right,
  .btn.is-animated .border.left,
  .form-submit.is-animated .border.right,
  .form-submit.is-animated .border.left {
    height: calc(100% + 12px);
  }
}

.btn-arrow {
  transition: transform 0.3s ease;
}

.btn:hover .btn-arrow {
  transform: translateX(4px);
}

/* -------- cta -------- */
.cta {
  text-align: center;
}

.cta .section-title {
  max-width: 20ch;
  margin: 0 auto 40px;
}

/* -------- works marquee（画像が横に流れるスライド） -------- */
.works-marquee {
  overflow: hidden;
  padding: 56px 0;
  background: var(--white);
}

.marquee-row {
  overflow: hidden;
  width: 100%;
}

.marquee-row + .marquee-row {
  margin-top: 16px;
}

.marquee-track {
  display: flex;
  gap: 16px;
  width: max-content;
  animation: marquee-left 36s linear infinite;
}

.marquee-track.track-reverse {
  animation-name: marquee-right;
}

.marquee-row:hover .marquee-track {
  animation-play-state: paused;
}

@keyframes marquee-left {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

@keyframes marquee-right {
  from { transform: translateX(-50%); }
  to { transform: translateX(0); }
}

.marquee-item {
  position: relative;
  flex: 0 0 auto;
  width: 500px;
  aspect-ratio: 4 / 3;
  border-radius: 4px;
  overflow: hidden;
  background:
    repeating-linear-gradient(135deg, var(--gray-100) 0px, var(--gray-100) 12px, var(--white) 12px, var(--white) 24px);
  border: 1px solid var(--border);
  display: flex;
  align-items: flex-end;
}

.marquee-item img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.marquee-label {
  position: relative;
  z-index: 1;
  margin: 12px;
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.85);
  padding: 5px 12px;
  border-radius: 999px;
}

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

@media (max-width: 640px) {
  .marquee-item {
    width: 300px;
  }
}

/* -------- works grid（実績一覧・カテゴリフィルタ） -------- */
.works-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 40px;
}

.works-filter button {
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: 0.06em;
  padding: 8px 18px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--gray-700);
  cursor: pointer;
  transition: border-color 0.3s ease, color 0.3s ease;
}

.works-filter button:hover,
.works-filter button.is-active {
  border-color: var(--ink);
  color: var(--ink);
}

.works-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.works-item {
  background: var(--white);
}

.works-item-thumb {
  aspect-ratio: 4 / 3;
  background: repeating-linear-gradient(135deg, var(--gray-100) 0px, var(--gray-100) 12px, var(--white) 12px, var(--white) 24px);
}

.works-item-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.works-item-body {
  padding: 24px clamp(20px, 3vw, 32px);
}

.works-item-title {
  font-size: 17px;
  margin-bottom: 12px;
}

@media (max-width: 640px) {
  .works-grid {
    grid-template-columns: 1fr;
  }
}

/* -------- footer -------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 56px 0 32px;
  color: var(--gray-700);
  font-size: 13px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 32px;
  margin-bottom: 40px;
}

.footer-logo img {
  height: 18px;
  margin-bottom: 16px;
}

.footer-nav {
  display: flex;
  gap: 24px;
  font-family: var(--font-en);
  letter-spacing: 0.06em;
}

.footer-meta {
  font-family: var(--font-en);
  color: var(--gray-500);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

/* -------- responsive -------- */
/* -------- character assemble animation -------- */
.char {
  display: inline-block;
  opacity: 0;
  transform: translateY(18px) rotate(6deg) scale(0.85);
  transition: opacity 1.1s cubic-bezier(0.16, 1, 0.3, 1), transform 1.1s cubic-bezier(0.16, 1, 0.3, 1);
}

.chars-in .char {
  opacity: 1;
  transform: none;
}

/* -------- mask reveal（Newsのようなスピード感のある見出しスライドイン） -------- */
.mask-reveal {
  overflow: hidden;
  display: block;
}

.mask-reveal span {
  display: inline-block;
  transform: translateY(105%);
  transition: transform 0.6s cubic-bezier(0.19, 1, 0.22, 1);
}

.mask-reveal.is-in span {
  transform: translateY(0);
}

/* -------- 文字が大きく揺れながら流れるように現れる見出し -------- */
.flow-char {
  display: inline-block;
  opacity: 0;
  transform: translate(-24px, 0) scale(0.75);
}

.flow-heading.is-in .flow-char {
  animation: char-flow 0.6s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes char-flow {
  0% {
    transform: translate(-24px, 0) scale(0.75);
    opacity: 0;
  }
  40% {
    transform: translate(6px, 0) scale(0.92);
    opacity: 1;
  }
  70% {
    transform: translate(0, 0) scale(1.08);
    opacity: 1;
  }
  100% {
    transform: translate(0, 0) scale(1);
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .flow-char {
    opacity: 1;
    transform: none;
  }
  .flow-heading.is-in .flow-char {
    animation: none;
  }
}

/* -------- decorative line-draw -------- */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.line-draw {
  display: inline-block;
  position: relative;
  width: 32px;
  height: 1px;
}

.line-draw::after {
  content: '';
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  height: 1px;
  width: 0;
  background: var(--gray-500);
  transition: width 1s cubic-bezier(0.22, 1, 0.36, 1);
}

.line-draw.is-animated::after {
  width: 100%;
}

/* -------- hero decorative lines（幅・高さを0から伸ばす） -------- */
.hero-line {
  position: absolute;
  background: var(--border);
  opacity: 0;
  transition: width 1.6s cubic-bezier(0.22, 1, 0.36, 1), height 1.6s cubic-bezier(0.22, 1, 0.36, 1), opacity 1.2s ease;
}

.hero-line-h {
  left: 0;
  height: 1px;
  width: 0;
}

.hero-line-v {
  top: 0;
  width: 1px;
  height: 0;
}

.hero-line.is-animated {
  opacity: 1;
}

.hero-line-h.is-animated {
  width: 100%;
}

.hero-line-v.is-animated {
  height: 100%;
}

/* -------- contact form -------- */
.contact-form {
  max-width: 640px;
  margin-top: 24px;
}

.form-field {
  margin-bottom: 32px;
}

.form-field label {
  display: block;
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gray-700);
  margin-bottom: 10px;
}

.form-field .required {
  color: var(--ink);
  font-size: 11px;
  margin-left: 6px;
}

.form-field input[type="text"],
.form-field input[type="email"],
.form-field textarea {
  width: 100%;
  border: none;
  border-bottom: 1px solid var(--border);
  background: transparent;
  padding: 12px 4px;
  font-family: var(--font-jp-body);
  font-size: 15px;
  color: var(--ink);
  outline: none;
  transition: border-color 0.3s ease;
}

.form-field input[type="text"]:focus,
.form-field input[type="email"]:focus,
.form-field textarea:focus {
  border-bottom-color: var(--ink);
}

.form-field textarea {
  resize: vertical;
  min-height: 140px;
}

.form-notice {
  padding: 14px 18px;
  border: 1px solid var(--border);
  color: var(--ink-soft);
  font-size: 14px;
  margin-bottom: 32px;
}

.form-submit {
  position: relative;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  font-family: var(--font-en);
  font-size: 14px;
  letter-spacing: 0.06em;
  padding: 16px 40px;
  cursor: pointer;
  transition: background 0.3s ease, color 0.3s ease;
}

.form-submit:hover {
  background: var(--ink);
  color: var(--white);
}

.form-honeypot {
  position: absolute;
  left: -9999px;
  top: -9999px;
}

@media (max-width: 860px) {
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
  .site-nav {
    position: fixed;
    inset: 0;
    top: 0;
    background: var(--white);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 32px;
    font-size: 16px;
    transform: translateY(-100%);
    transition: transform 0.4s ease;
    z-index: 90;
  }
  .site-nav.is-open {
    transform: translateY(0);
  }
  .nav-toggle {
    display: block;
    z-index: 110;
    background: none;
    border: none;
    cursor: pointer;
    width: 28px;
    height: 20px;
    position: relative;
  }
  .nav-toggle span,
  .nav-toggle::before,
  .nav-toggle::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--ink);
    transition: transform 0.3s ease, opacity 0.3s ease;
  }
  .nav-toggle::before { top: 0; }
  .nav-toggle span { top: 50%; }
  .nav-toggle::after { bottom: 0; }
  .info-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}