:root {
  --text: #f7f7f5;
  --muted: rgba(255, 255, 255, 0.68);
  --gold: #c9aa63;

  --gradient-scroll-x: 0px;
  --gradient-scroll-y: 0px;
  --gradient-scroll-rotate: 0deg;

  /* 暗部は約7割のまま、明部だけ輝度差を強くしてアクセントを効かせる。 */
  --page-gradient-fallback:
    radial-gradient(
      ellipse 50% 58% at 0% 96%,
      rgba(0, 232, 220, 0.96) 0%,
      rgba(0, 184, 194, 0.84) 20%,
      rgba(0, 115, 145, 0.48) 42%,
      rgba(0, 67, 94, 0.16) 58%,
      transparent 70%
    ),
    radial-gradient(
      ellipse 46% 52% at 100% 90%,
      rgba(0, 214, 174, 0.90) 0%,
      rgba(0, 162, 153, 0.76) 22%,
      rgba(0, 98, 116, 0.42) 44%,
      rgba(0, 58, 76, 0.14) 58%,
      transparent 70%
    ),
    radial-gradient(
      ellipse 38% 38% at 98% 4%,
      rgba(42, 164, 217, 0.66) 0%,
      rgba(18, 105, 156, 0.40) 34%,
      rgba(5, 60, 96, 0.14) 54%,
      transparent 68%
    ),
    linear-gradient(
      135deg,
      #033a56 0%,
      #001626 44%,
      #004352 100%
    );
}
* {
  box-sizing: border-box;
}

[v-cloak] {
  display: none;
}

html {
  scroll-behavior: smooth;
  min-height: 100%;

  background-color: #001626;
  background-image: var(--page-gradient-fallback);
  background-position: center top;
  background-repeat: no-repeat;
  background-size: 100vw 100lvh;
}

html.is-page-loading,
body.is-page-loading {
  background: #fff;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100lvh;

  color: var(--text);

  background-color: #001626;
  background-image: var(--page-gradient-fallback);
  background-position: center top;
  background-repeat: no-repeat;
  background-size: 100vw 100lvh;

  line-height: 1.7;
  overflow-x: hidden;
}

#body_content,
#app,
.site-app,
.v-application,
.v-application__wrap {
  min-height: 100vh;
  min-height: 100svh;
}

.site-app,
.v-application,
.v-application__wrap {
  color: inherit;
  background: transparent !important;
}

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

button {
  font: inherit;
}

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

/* =========================================
   Fixed gradient background
========================================= */

.gradient-background {
  position: fixed;
  top: 0;
  left: 0;

  width: 100%;
  height: 100lvh;

  z-index: 0;
  overflow: hidden;
  pointer-events: none;
  background: #001626;

  transform: translateZ(0);
}

#body_content {
  position: relative;
  z-index: 1;
}

/* 暗部の面積は維持しつつ、明部の芯を潰さない程度に全体を締める。 */
.gradient-background::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background:
    radial-gradient(
      ellipse 84% 80% at 50% 40%,
      rgba(0, 7, 16, 0.02) 0%,
      rgba(0, 7, 16, 0.08) 40%,
      rgba(0, 5, 13, 0.20) 66%,
      rgba(0, 3, 10, 0.38) 100%
    ),
    rgba(0, 6, 15, 0.12);
}

.gradient-scroll-layer {
  z-index: 1;
  position: absolute;
  inset: -22%;
  transform: translate3d(var(--gradient-scroll-x), var(--gradient-scroll-y), 0)
    rotate(var(--gradient-scroll-rotate));
  will-change: transform;
}

.gradient-animation-layer {
  position: absolute;
  inset: -4%;
  overflow: hidden;
  transform: scale(1.14);
  background:
    radial-gradient(ellipse 50% 58% at 0% 96%, rgba(0, 232, 220, 0.96) 0%, rgba(0, 184, 194, 0.84) 20%, rgba(0, 115, 145, 0.48) 42%, rgba(0, 67, 94, 0.16) 58%, transparent 70%),
    radial-gradient(ellipse 46% 52% at 100% 90%, rgba(0, 214, 174, 0.90) 0%, rgba(0, 162, 153, 0.76) 22%, rgba(0, 98, 116, 0.42) 44%, rgba(0, 58, 76, 0.14) 58%, transparent 70%),
    radial-gradient(ellipse 38% 38% at 98% 4%, rgba(42, 164, 217, 0.66) 0%, rgba(18, 105, 156, 0.40) 34%, rgba(5, 60, 96, 0.14) 54%, transparent 68%),
    radial-gradient(ellipse 70% 88% at 48% 16%, rgba(0, 5, 20, 0.82) 0%, rgba(0, 13, 34, 0.56) 30%, rgba(0, 31, 49, 0.26) 56%, transparent 78%),
    linear-gradient(135deg, #033a56 0%, #001626 44%, #004352 100%);
  background-size: 118% 118%;
  animation: gradient-water-base 22s ease-in-out infinite alternate;
  will-change: transform, background-position;
}

.gradient-animation-layer::before {
  content: "";
  position: absolute;
  inset: -24%;
  background: conic-gradient(
    from 215deg at 49% 52%,
    transparent 0deg 44deg,
    rgba(0, 236, 220, 0.28) 70deg,
    rgba(30, 142, 190, 0.16) 98deg,
    transparent 130deg 210deg,
    rgba(0, 196, 164, 0.22) 236deg,
    transparent 282deg 360deg
  );
  filter: blur(42px);
  mix-blend-mode: screen;
  opacity: 0.58;
  transform: translate3d(-7%, -3%, 0) scale(1.14) rotate(-8deg);
  animation: gradient-water-stream 15s ease-in-out infinite alternate;
  will-change: transform, opacity;
}

.gradient-animation-layer::after {
  content: "";
  position: absolute;
  inset: -20%;
  background:
    radial-gradient(ellipse 34% 24% at 18% 40%, rgba(0, 224, 210, 0.26) 0%, rgba(0, 138, 160, 0.14) 40%, transparent 66%),
    radial-gradient(ellipse 36% 24% at 82% 68%, rgba(0, 210, 172, 0.22) 0%, rgba(0, 112, 129, 0.12) 42%, transparent 68%),
    radial-gradient(ellipse 58% 62% at 54% 16%, rgba(0, 5, 20, 0.50) 0%, rgba(0, 19, 37, 0.26) 44%, transparent 74%);
  filter: blur(34px);
  mix-blend-mode: soft-light;
  opacity: 0.9;
  transform: translate3d(6%, 4%, 0) scale(1.08) rotate(5deg);
  animation: gradient-water-swell 19s ease-in-out infinite alternate;
  will-change: transform, opacity;
}

@keyframes gradient-water-base {
  0% { background-position: 0% 15%; transform: translate3d(-3%, -2%, 0) scale(1.14) rotate(-2deg); }
  32% { background-position: 42% 4%; transform: translate3d(4%, 1%, 0) scale(1.2) rotate(1.5deg); }
  66% { background-position: 75% 88%; transform: translate3d(-1%, 5%, 0) scale(1.17) rotate(-1deg); }
  100% { background-position: 100% 50%; transform: translate3d(5%, -3%, 0) scale(1.22) rotate(2.5deg); }
}

@keyframes gradient-water-stream {
  0% { opacity: 0.42; transform: translate3d(-10%, -7%, 0) scale(1.08) rotate(-13deg); }
  45% { opacity: 0.72; transform: translate3d(8%, 5%, 0) scale(1.26) rotate(8deg); }
  100% { opacity: 0.50; transform: translate3d(-1%, 12%, 0) scale(1.16) rotate(22deg); }
}

@keyframes gradient-water-swell {
  0% { opacity: 0.38; transform: translate3d(9%, 8%, 0) scale(1.08) rotate(7deg); }
  40% { opacity: 0.58; transform: translate3d(-8%, -4%, 0) scale(1.22) rotate(-7deg); }
  100% { opacity: 0.44; transform: translate3d(4%, -11%, 0) scale(1.14) rotate(12deg); }
}

body[data-motion="scroll"] .gradient-animation-layer,
body[data-motion="scroll"] .gradient-animation-layer::before,
body[data-motion="scroll"] .gradient-animation-layer::after {
  animation: none;
}

body[data-motion="always"] .gradient-scroll-layer {
  transform: none;
}

/* =========================================
   Common visual styles
   余白・配置・レスポンシブ幅は index.html の
   Vuetifyユーティリティクラス／v-row／v-colで管理する。
========================================= */

.section {
  position: relative;
}

.section-dark,
.section-deep,
.section-light {
  color: #fff;
  background: transparent;
}

.section-heading {
  font-size: clamp(1.8rem, 3.6vw, 2.7rem);
  font-weight: 400;
  line-height: 1.35;
  letter-spacing: 0.025em;
}

/* =========================================
   Header
========================================= */

#header {
  z-index: 3001;
}

#header .v-toolbar__content,
#header .v-toolbar-title,
#header .v-toolbar-title__placeholder {
  overflow: visible;
}

.source-header-logo {
  line-height: 0;
}

.source-header-logo a,
.source-header-logo img {
  display: block;
}

/* =========================================
   Hero
========================================= */

.hero {
  min-height: calc(100svh - 64px);
  height: calc(100svh - 64px);
  overflow: hidden;
  isolation: isolate;
  background:
    linear-gradient(rgba(15, 23, 29, 0.12), rgba(15, 23, 29, 0.28)),
    linear-gradient(135deg, #c8b9a0 0%, #b7a68d 48%, #9b8e7d 100%);
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(
      circle at 50% 45%,
      transparent 0%,
      rgba(0, 0, 0, 0.08) 58%,
      rgba(0, 0, 0, 0.24) 100%
    );
}

.hero__media {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;

  opacity: 0;
}

.hero__media.is-ready {
  opacity: 1;
}
/*
.hero__placeholder {
  position: relative;
  z-index: 2;
  border: 1px solid rgba(255, 255, 255, 0.56);
  color: #fff;
  background: rgba(0, 0, 0, 0.12);
  font-size: clamp(1.4rem, 3.5vw, 2.6rem);
  letter-spacing: 0.05em;
}
*/

/* =========================================
   Sale summary
========================================= */

.sale-title {
  line-height: 1;
}

/* セールタイトル
   PCではサブタイトル最大サイズ（1.72rem）の約1.5倍を上限にする。
   スマートフォンでは1行表示を優先し、はみ出さない範囲まで縮小する。 */
.sale-title__main {
  display: block;
  width: fit-content;
  max-width: 100%;

  font-size: clamp(1.9rem, 3.8vw, 3.25rem);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: 0.015em;

  white-space: nowrap;
}

/* セールサブタイトル */
.sale-title__subtitle {
  font-size: clamp(1.2rem, 2.05vw, 1.72rem);
  font-weight: 400;
  line-height: 1.7;
  letter-spacing: 0.055em;
}

.sale-title__subtitle.font_ja_title {
  font-size: clamp(1.2rem, 2.05vw, 1.72rem);
  line-height: 1.7;
  letter-spacing: 0.055em;
}

.sale-title__subtitle.font_en_title {
  font-size: clamp(1.08rem, 1.75vw, 1.5rem);
  line-height: 1.55;
  letter-spacing: 0.025em;
}

.schedule-item {
  border-top: 1px solid rgba(255, 255, 255, 0.25);
}

.schedule-item dt {
  color: var(--muted);
  font-size: 1.08rem;
  font-weight: 400;
  line-height: 1.45;
  letter-spacing: 0.09em;
}

.schedule-item dd {
  font-size: clamp(1.16rem, 1.95vw, 1.55rem);
  font-weight: 400;
  line-height: 1.65;
  letter-spacing: 0.025em;
}

.schedule-item.font_en_sch dd {
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* =========================================
   Page anchor navigation
========================================= */

.page-anchor-nav__button {
  min-width: 0 !important;
  height: auto !important;
  border-color: rgba(255, 255, 255, 0.58) !important;
  color: #fff !important;
  font-size: clamp(0.82rem, 0.9vw, 0.92rem) !important;
  font-weight: 400 !important;
  letter-spacing: 0.025em;
}

.page-anchor-nav__button .v-btn__content {
  min-width: 0;
  width: 100%;
  justify-content: center;
  white-space: normal;
  line-height: 1.35;
  text-align: center;
}

@media (min-width: 960px) {
  /* PCでは章リンクを1行に均等配分する。章数が変わっても各ボタン幅を揃える。 */
  .page-anchor-nav__col {
    flex: 1 1 0 !important;
    width: auto !important;
    max-width: none !important;
  }
}

.page-anchor-nav__button:hover {
  border-color: rgba(255, 255, 255, 0.9) !important;
  background: rgba(255, 255, 255, 0.08) !important;
}

.page-anchor-target {
  scroll-margin-top: 80px;
}

/* =========================================
   Messages
   セクション全体ではなく、文章を囲む領域だけに明るい背景を置く。
========================================= */

.messages {
  position: relative;
  z-index: 0;
  background: transparent;
}

.message-surface {
  position: relative;
  z-index: 0;
  isolation: isolate;
  overflow: hidden;
  color: #fff;
  background: rgba(0, 0, 0, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.24);
  backdrop-filter: blur(8px);
  box-shadow:
    0 24px 64px rgba(0, 5, 16, 0.24),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.message-surface::before,
.message-surface::after {
  display: none;
}

@keyframes message-gradient-flow {
  0% {
    background-position: 0% 18%;
    transform: translate3d(-3%, -2%, 0) scale(1.06) rotate(-1deg);
  }

  48% {
    background-position: 54% 76%;
    transform: translate3d(3%, 1%, 0) scale(1.13) rotate(1.5deg);
  }

  100% {
    background-position: 100% 38%;
    transform: translate3d(-1%, 4%, 0) scale(1.09) rotate(-1.5deg);
  }
}

.message-accordions {
  gap: clamp(16px, 2vw, 24px);
}

.message-accordions .v-expansion-panel {
  color: #fff;
  background: rgba(0, 30, 48, 0.18) !important;
  border: 1px solid rgba(255, 255, 255, 0.24);
  box-shadow: 0 10px 28px rgba(0, 20, 35, 0.12) !important;
}

.message-accordion-item {
  position: relative;
  overflow: hidden;
  padding-inline-start: clamp(18px, 2.2vw, 30px);
}

/* Vuetify標準のパネル間セパレーターを使わず、各挨拶文に個別の棒線を置く。 */
.message-accordion-item::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  z-index: 2;
  width: 5px;
  background: linear-gradient(180deg, #f4d574 0%, #c99832 100%);
  box-shadow: 0 0 18px rgba(244, 213, 116, 0.2);
}

.message-accordion-item::after {
  display: none !important;
}

.message-accordion-inner > h2 {
  color: #fff;
  font-size: clamp(1.35rem, 1.9vw, 1.72rem);
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0.035em;
  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.14);
}

/* 現行HTMLの本文クラスに直接指定する。 */
.message-copy {
  color: rgba(255, 255, 255, 0.92);
  font-weight: 400;
  line-break: strict;
  word-break: normal;
  overflow-wrap: anywhere;
  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.12);
}

.message-copy.font_ja_int {
  font-size: clamp(1rem, 1.02vw, 1.08rem);
  line-height: 2.05;
  letter-spacing: 0.025em;
}

.message-copy.font_en_int {
  font-size: clamp(1.03rem, 1.08vw, 1.13rem);
  line-height: 1.92;
  letter-spacing: 0.012em;
}

.message-copy > p,
.message-more p {
  margin: 0 0 1.55em;
}

.message-copy > p:last-child,
.message-more p:last-child {
  margin-bottom: 0;
}

.message-more {
  margin-top: 1.55em;
}

.message-toggle-row {
  display: flex;
  justify-content: center;
}

.message-toggle-button {
  opacity: 0.9;
}

.message-toggle-button:hover {
  opacity: 1;
  background: rgba(255, 255, 255, 0.07) !important;
}

@media (max-width: 599px) {
  /* SPでは挨拶文の多重paddingを抑え、本文幅を確保する。 */
  .message-surface {
    /* 右側の余白を詰め、本文が使える横幅を広げる。 */
    padding: 16px 6px 16px 10px !important;
    box-shadow:
      0 18px 42px rgba(0, 5, 16, 0.28),
      inset 0 1px 0 rgba(255, 255, 255, 0.08);
  }

  .message-accordion-item {
    padding-inline-start: 6px;
  }

  .message-accordion-inner {
    padding-left: 8px !important;
    padding-right: 2px !important;
  }

  .message-accordion-item::before {
    width: 3px;
  }

  .message-accordion-inner > h2 {
    font-size: 1.28rem;
    line-height: 1.5;
    letter-spacing: 0.025em;
  }

  .message-copy.font_ja_int {
    font-size: 0.95rem;
    line-height: 1.98;
    letter-spacing: 0.018em;
    overflow-wrap: break-word;
  }

  .message-copy.font_en_int {
    font-size: 0.98rem;
    line-height: 1.88;
    letter-spacing: 0.008em;
    overflow-wrap: break-word;
  }

  .message-copy > p,
  .message-more p {
    margin-bottom: 1.45em;
  }
}

/* スマートフォンではセールタイトルを1行のまま収める。 */
@media (max-width: 599px) {
  .sale-title__main {
    width: 100%;
    font-size: clamp(1.02rem, 5.2vw, 1.6rem);
    letter-spacing: 0;
  }
}

/* iPhone SE相当ではさらに安全側に寄せ、左右の見切れを防ぐ。 */
@media (max-width: 390px) {
  .sale-title__main {
    font-size: clamp(1rem, 5vw, 1.28rem);
  }
}

body[data-motion="scroll"] .message-surface::before {
  animation: none;
}

/* =========================================
   Works
========================================= */

.works-subheading {
  color: rgba(255, 255, 255, 0.68);
  font-size: 0.84rem;
  line-height: 1.5;
  letter-spacing: 0.1em;
}

.chapter-header,
.chapter-header--light,
.seller-card {
  color: #fff;
  background: rgba(0, 0, 0, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.24);
  backdrop-filter: blur(8px);
}

.chapter-number {
  font-size: clamp(1.45rem, 2.2vw, 1.95rem);
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0.06em;
}

.chapter-title {
  font-size: clamp(1.5rem, 2.1vw, 2rem);
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: 0.035em;
}

.chapter-title.font_en_title {
  letter-spacing: 0.02em;
}

.chapter-description {
  font-size: clamp(1rem, 1.08vw, 1.08rem);
  font-weight: 400;
  line-height: 2;
  letter-spacing: 0.025em;
  line-break: strict;
}

.chapter-description.font_en_int {
  line-height: 1.85;
  letter-spacing: 0.012em;
}

.work-card {
  overflow: hidden;
  border: 1px solid #d5d5d2;
  background: #f1f1ef;
}

.work-image {
  min-height: 0;
  aspect-ratio: 1 / 1;
  background: #fff;
}

.work-image__asset {
  display: block;
  width: 100%;
  height: 100%;
  max-width: none;
  max-height: none;
  object-fit: contain;
}

.work-image__placeholder {
  width: min(100%, 240px);
  aspect-ratio: 4 / 3;
  color: #8d8578;
  background: linear-gradient(135deg, #e8dfd2, #d7cbbb);
  font-size: 0.75rem;
}

.work-info {
  background: #ededeb;
}

.lot {
  color: #73736f;
  font-size: 0.78rem;
  font-weight: 400;
  line-height: 1.45;
  letter-spacing: 0.07em;
}

.artist {
  color: #111;
  font-size: clamp(1.18rem, 1.42vw, 1.34rem);
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0.015em;
}

.work-title {
  color: #3d3d3a;
  font-size: clamp(1.04rem, 1.18vw, 1.14rem);
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.015em;
}

/* 日本語の作家名は、作品カード内で一段強く見せる。 */
.artist.font_ja_gothic {
  font-weight: 600;
}

/* 英語の作品名は、英語本文より少し強いウェイトで見せる。 */
.work-title.font_en_int {
  font-weight: 500;
}

.work-public-info {
  border-top: 1px solid #d2d2cf;
}

.estimate {
  color: #333;
  font-size: 0.86rem;
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0.015em;
}

.detail-link {
  color: #111;
  font-size: 0.86rem;
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0.015em;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* =========================================
   Seller
========================================= */

.seller-card h2 {
  font-size: clamp(1.95rem, 3.15vw, 2.75rem);
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: 0.035em;
}

.seller-card > div {
  color: rgba(255, 255, 255, 0.82);
  font-size: clamp(1rem, 1.08vw, 1.08rem);
  font-weight: 400;
  line-height: 2;
  letter-spacing: 0.025em;
  line-break: strict;
}

/* =========================================
   Footer
========================================= */

.source-footer {
  position: relative;
  z-index: 1;
  color: #2a2a2a;
  font-size: 0.75rem;
}

.source-footer img {
  display: block;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .gradient-animation-layer,
  .gradient-animation-layer::before,
  .gradient-animation-layer::after,
  .message-surface::before {
    animation: none !important;
  }

  .gradient-scroll-layer {
    transform: none !important;
  }

  .work-card {
    transition: none;
  }
}


/* =========================================
   Vuetify layout stabilization
========================================= */

#content.v-main {
  padding-top: 64px !important;
  transition: none !important;
}

@media (max-width: 390px) {
  .hero {
    min-height: 603px;
    height: 603px;
  }
}