/**
 * Certificate of Authenticity (COA) Luxury Stylesheet
 * Standard: Museum Fine-Art Archival Certificate (A4 / 8x10 Landscape)
 */

:root {
  --coa-paper: #FAF8F3;
  --coa-paper-alt: #F3EFE6;
  --coa-paper-dark: #ECE7DA;
  --coa-ink: #17211F;
  --coa-ink-light: #4A463F;
  --coa-muted: #7A746B;
  --coa-gold: #C29B48;
  --coa-gold-dark: #987529;
  --coa-gold-light: #E8D8A6;
  --coa-vermilion: #B23A2B;
  --coa-font-serif: "Playfair Display", "Didot", "Songti SC", "SimSun", "Cinzel", "Times New Roman", serif;
  --coa-font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

*, *::before, *::after {
  box-sizing: border-box;
}

body.coa-page {
  margin: 0;
  padding: 0;
  background-color: #202424;
  background-image: radial-gradient(circle at 50% 20%, #2A3030 0%, #151818 100%);
  color: var(--coa-ink);
  font-family: var(--coa-font-sans);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 顶部控制栏（仅屏幕可见，打印时自动隐藏） */
.coa-control-bar {
  background: rgba(23, 33, 31, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(194, 155, 72, 0.25);
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
  color: #FAF8F3;
}

.coa-bar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: #FAF8F3;
  font-size: 0.9rem;
}

.coa-bar-brand:hover {
  color: var(--coa-gold-light);
}

.coa-bar-title {
  font-family: var(--coa-font-serif);
  letter-spacing: 0.15em;
  font-weight: 500;
  color: var(--coa-gold-light);
}

.coa-bar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.coa-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  border: 1px solid transparent;
}

.coa-btn-gold {
  background: linear-gradient(135deg, #D4AF37 0%, #AA8222 100%);
  color: #17211F;
  border-color: #D4AF37;
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(212, 175, 55, 0.25);
}

.coa-btn-gold:hover {
  background: linear-gradient(135deg, #E2C04D 0%, #BC9228 100%);
  box-shadow: 0 4px 14px rgba(212, 175, 55, 0.4);
  transform: translateY(-1px);
}

.coa-btn-outline {
  background: rgba(250, 248, 243, 0.08);
  color: #FAF8F3;
  border-color: rgba(250, 248, 243, 0.25);
}

.coa-btn-outline:hover {
  background: rgba(250, 248, 243, 0.15);
  border-color: rgba(250, 248, 243, 0.4);
}

.coa-lang-select {
  background: rgba(23, 33, 31, 0.9);
  color: #FAF8F3;
  border: 1px solid rgba(194, 155, 72, 0.3);
  padding: 7px 12px;
  border-radius: 8px;
  font-size: 0.85rem;
  cursor: pointer;
}

/* 证书容器视口 */
.coa-viewport {
  flex: 1;
  padding: 32px 16px 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

/* 核心证书卡片主体（物理画幅比例与高贵羊皮纸材质） */
.coa-card {
  width: 1040px;
  max-width: 100%;
  aspect-ratio: 1.414 / 1; /* A4 横版比例 (297 / 210) */
  background-color: var(--coa-paper);
  background-image: 
    radial-gradient(ellipse at 50% 50%, #FFFDF9 0%, #FAF6EE 70%, #EFE9DC 100%),
    linear-gradient(rgba(194, 155, 72, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(194, 155, 72, 0.03) 1px, transparent 1px);
  background-size: 100% 100%, 20px 20px, 20px 20px;
  box-shadow: 
    0 16px 48px rgba(0, 0, 0, 0.4),
    0 2px 8px rgba(0, 0, 0, 0.2),
    inset 0 0 100px rgba(194, 155, 72, 0.08);
  border-radius: 4px;
  position: relative;
  padding: 26px 38px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
}

/* 双重古典装饰边框与角落回纹 */
.coa-outer-frame {
  position: absolute;
  top: 14px;
  left: 14px;
  right: 14px;
  bottom: 14px;
  border: 2px solid var(--coa-gold);
  pointer-events: none;
}

.coa-inner-frame {
  position: absolute;
  top: 20px;
  left: 20px;
  right: 20px;
  bottom: 20px;
  border: 1px solid rgba(23, 33, 31, 0.7);
  pointer-events: none;
}

.coa-corner {
  position: absolute;
  width: 32px;
  height: 32px;
  border: 2px solid var(--coa-gold-dark);
  pointer-events: none;
}

.coa-corner-tl { top: 24px; left: 24px; border-right: none; border-bottom: none; }
.coa-corner-tr { top: 24px; right: 24px; border-left: none; border-bottom: none; }
.coa-corner-bl { bottom: 24px; left: 24px; border-right: none; border-top: none; }
.coa-corner-br { bottom: 24px; right: 24px; border-left: none; border-top: none; }

/* 居中画室徽标微缩水印 */
.coa-watermark {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 360px;
  height: 360px;
  opacity: 0.04;
  pointer-events: none;
  background-image: url("/assets/brand/icon-20260923-512.png");
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  filter: grayscale(100%);
}

/* 证书头部 */
.coa-header {
  text-align: center;
  position: relative;
  z-index: 2;
  margin-bottom: 8px;
}

.coa-brand-crest {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 2px;
}

.coa-brand-crest img {
  height: 32px;
  width: auto;
}

.coa-atelier-name {
  font-family: var(--coa-font-serif);
  font-size: 1.15rem;
  letter-spacing: 0.35em;
  font-weight: 700;
  color: var(--coa-ink);
  text-transform: uppercase;
  margin: 0;
}

.coa-atelier-sub {
  font-size: 0.62rem;
  letter-spacing: 0.28em;
  color: var(--coa-gold-dark);
  text-transform: uppercase;
  margin: 2px 0 4px;
  font-weight: 600;
}

.coa-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin: 3px auto 6px;
  width: 260px;
}

.coa-divider::before,
.coa-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--coa-gold), transparent);
}

.coa-divider-symbol {
  color: var(--coa-gold);
  font-size: 0.75rem;
}

.coa-title {
  font-family: var(--coa-font-serif);
  font-size: 1.65rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--coa-ink);
  text-transform: uppercase;
  margin: 0;
  line-height: 1.1;
}

.coa-subtitle {
  font-family: var(--coa-font-serif);
  font-size: 0.85rem;
  letter-spacing: 0.4em;
  color: var(--coa-muted);
  margin: 2px 0 0;
  font-weight: 500;
}

/* 典藏展台：左侧认证原作微缩画心 + 右侧官方认证声明（符合博物馆左右对称装帧） */
.coa-showcase-split {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: 20px;
  align-items: center;
  margin: 8px 0 10px;
  padding: 8px 14px;
  background: rgba(255, 253, 249, 0.65);
  border: 1px solid rgba(194, 155, 72, 0.32);
  border-radius: 4px;
  position: relative;
  z-index: 2;
  box-shadow: inset 0 0 20px rgba(194, 155, 72, 0.04);
}

.coa-artwork-col {
  display: flex;
  justify-content: center;
  align-items: center;
}

.coa-artwork-frame {
  position: relative;
  width: 100%;
  max-width: 185px;
  height: 114px;
  background: #FFFFFF;
  padding: 3px;
  border: 1px solid var(--coa-gold);
  border-radius: 2px;
  box-shadow: 
    0 4px 12px rgba(23, 33, 31, 0.09),
    inset 0 0 0 1px rgba(23, 33, 31, 0.12);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.coa-artwork-img {
  width: 100%;
  height: calc(100% - 16px);
  object-fit: cover;
  object-position: center 20%;
  border-radius: 1px;
  display: block;
  background-color: #f7f5f0;
}

.coa-artwork-mount-caption {
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--coa-paper-alt);
  border-top: 1px solid rgba(194, 155, 72, 0.3);
  font-size: 0.48rem;
  font-weight: 600;
  letter-spacing: 0.10em;
  color: var(--coa-gold-dark);
  text-transform: uppercase;
}

.coa-decl-col {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 108px;
}

.coa-declaration-inner {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
}

/* 艺术参数规范网格 */
.coa-specs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px 18px;
  background: rgba(243, 239, 230, 0.7);
  border: 1px solid rgba(194, 155, 72, 0.35);
  border-radius: 6px;
  padding: 8px 18px;
  position: relative;
  z-index: 2;
  margin-bottom: 8px;
}

.coa-spec-item {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.coa-spec-label {
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: var(--coa-gold-dark);
  text-transform: uppercase;
  font-weight: 600;
}

.coa-spec-value {
  font-size: 0.85rem;
  color: var(--coa-ink);
  font-weight: 600;
  font-family: var(--coa-font-serif);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.coa-spec-value.is-number {
  font-family: "Courier New", Courier, monospace;
  letter-spacing: 0.05em;
  color: #17211F;
}

/* 画师手记区域 */
.coa-inscription-card {
  background: #FFFDF9;
  border-left: 3px solid var(--coa-gold);
  border-top: 1px solid rgba(194, 155, 72, 0.2);
  border-right: 1px solid rgba(194, 155, 72, 0.2);
  border-bottom: 1px solid rgba(194, 155, 72, 0.2);
  padding: 7px 16px;
  border-radius: 0 6px 6px 0;
  position: relative;
  z-index: 2;
  margin-bottom: 8px;
}

.coa-inscription-header {
  font-size: 0.65rem;
  letter-spacing: 0.10em;
  color: var(--coa-gold-dark);
  text-transform: uppercase;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 5px;
  margin-bottom: 3px;
}

.coa-inscription-quote {
  font-family: var(--coa-font-serif);
  font-style: italic;
  font-size: 0.85rem;
  line-height: 1.4;
  color: var(--coa-ink);
  margin: 0;
}

/* 底部防伪验真与亲笔签章区域 */
.coa-footer {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  position: relative;
  z-index: 2;
  padding-top: 4px;
  border-top: 1px solid rgba(194, 155, 72, 0.25);
}

/* 左侧：防伪微型二维码与验真提示 */
.coa-verify-box {
  display: flex;
  align-items: center;
  gap: 10px;
}

.coa-qr-frame {
  width: 56px;
  height: 56px;
  background: #FFF;
  border: 1px solid rgba(194, 155, 72, 0.5);
  border-radius: 4px;
  padding: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
}

.coa-qr-frame img,
.coa-qr-frame svg {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.coa-verify-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.coa-verify-title {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--coa-ink);
}

.coa-verify-url {
  font-size: 0.65rem;
  color: var(--coa-gold-dark);
  font-family: monospace;
}

.coa-verify-hint {
  font-size: 0.62rem;
  color: var(--coa-muted);
}

/* 中间：画室馆藏钢印图章 */
.coa-emboss-seal {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  border: 1.5px dashed rgba(194, 155, 72, 0.6);
  border-radius: 50%;
  width: 70px;
  height: 70px;
  padding: 6px;
  color: var(--coa-gold-dark);
  font-family: var(--coa-font-serif);
}

.coa-emboss-star {
  font-size: 0.8rem;
  color: var(--coa-gold);
}

.coa-emboss-text {
  font-size: 0.48rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 700;
  line-height: 1.1;
  margin: 1px 0;
}

.coa-emboss-years {
  font-size: 0.44rem;
  color: var(--coa-muted);
}

/* 右侧：画师手写西文签名与朱红工匠印章 */
.coa-signature-block {
  display: flex;
  align-items: center;
  gap: 14px;
}

.coa-sig-col {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.coa-signature-img {
  height: 44px;
  width: auto;
  object-fit: contain;
  margin-bottom: -3px;
}

.coa-sig-caption {
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: var(--coa-ink-light);
  font-family: var(--coa-font-serif);
  border-top: 1px solid rgba(23, 33, 31, 0.4);
  padding-top: 2px;
  min-width: 140px;
  text-align: right;
}

.coa-seal-img {
  width: 50px;
  height: 50px;
  object-fit: contain;
  filter: drop-shadow(0 1px 3px rgba(178, 58, 43, 0.25));
}

/* 页面底部简短说明 */
.coa-page-notice {
  margin-top: 24px;
  text-align: center;
  color: rgba(250, 248, 243, 0.6);
  font-size: 0.82rem;
  max-width: 720px;
}

/* 打印样式（纯净无边距 A4 / 8x10 横版打印输出） */
@media print {
  @page {
    size: A4 landscape;
    margin: 0;
  }

  body.coa-page {
    background: transparent !important;
    color: #000 !important;
    padding: 0 !important;
    margin: 0 !important;
  }

  .coa-control-bar,
  .coa-page-notice {
    display: none !important;
  }

  .coa-viewport {
    padding: 0 !important;
    margin: 0 !important;
    display: block !important;
  }

  .coa-card {
    width: 100vw !important;
    height: 100vh !important;
    max-width: none !important;
    aspect-ratio: auto !important;
    box-shadow: none !important;
    border-radius: 0 !important;
    padding: 28mm 24mm !important;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
    page-break-inside: avoid !important;
    page-break-after: avoid !important;
  }
}

/* 移动端响应式适配 */
@media (max-width: 768px) {
  .coa-control-bar {
    padding: 10px 14px;
    flex-wrap: wrap;
    gap: 10px;
  }

  .coa-card {
    aspect-ratio: auto;
    padding: 24px 20px;
  }

  .coa-title {
    font-size: 1.35rem;
  }

  .coa-showcase-split {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 12px;
  }

  .coa-artwork-frame {
    max-width: 240px;
    height: 140px;
  }

  .coa-decl-col {
    min-height: auto;
    text-align: center;
  }

  .coa-specs-grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .coa-footer {
    flex-direction: column;
    align-items: center;
    gap: 16px;
    text-align: center;
  }

  .coa-sig-col {
    align-items: center;
  }

  .coa-sig-caption {
    text-align: center;
  }
}


/* ==========================================================================
   Language Mode Presentation: English-Only vs Other-Primary / English-Auxiliary
   ========================================================================== */

.coa-primary {
  font-weight: 600;
  color: var(--coa-ink);
}

.coa-secondary {
  font-size: 0.85em;
  color: var(--coa-muted);
  font-family: var(--coa-font-serif);
  font-style: italic;
  font-weight: 400;
  letter-spacing: 0.05em;
}

.coa-spec-label .coa-primary {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--coa-gold-dark);
  letter-spacing: 0.12em;
}

.coa-spec-label .coa-secondary {
  font-size: 0.58rem;
  color: var(--coa-muted);
  letter-spacing: 0.08em;
  font-style: normal;
  margin-left: 5px;
}

.coa-spec-value .coa-val-primary {
  display: block;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--coa-ink);
  line-height: 1.25;
}

.coa-spec-value .coa-val-sec {
  display: block;
  font-size: 0.70rem;
  color: var(--coa-muted);
  font-family: var(--coa-font-serif);
  font-style: italic;
  font-weight: 400;
  margin-top: 2px;
  line-height: 1.2;
}

.coa-declaration .coa-decl-primary,
.coa-decl-col .coa-decl-primary {
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--coa-ink);
  font-weight: 500;
  letter-spacing: 0.03em;
  margin: 0;
}

.coa-declaration .coa-decl-secondary,
.coa-decl-col .coa-decl-secondary {
  font-size: 0.73rem;
  line-height: 1.45;
  color: var(--coa-muted);
  font-family: var(--coa-font-serif);
  font-style: italic;
  margin: 0;
  padding-top: 5px;
  border-top: 1px dashed rgba(194, 155, 72, 0.28);
}

.coa-inscription-card .coa-quote-primary {
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--coa-ink);
  font-weight: 500;
}

.coa-inscription-card .coa-quote-secondary {
  display: block;
  font-size: 0.74rem;
  line-height: 1.4;
  color: var(--coa-muted);
  font-family: var(--coa-font-serif);
  font-style: italic;
  margin-top: 6px;
  padding-top: 6px;
  border-top: 1px dashed rgba(194, 155, 72, 0.25);
}

/* 纯英文模式（is-lang-en）：隐藏所有辅文字，纯正国际博物馆英文标准排版 */
.is-lang-en .coa-secondary,
.is-lang-en .coa-val-sec,
.is-lang-en .coa-decl-secondary,
.is-lang-en .coa-quote-secondary {
  display: none !important;
}

.is-lang-en .coa-declaration .coa-decl-primary,
.is-lang-en .coa-decl-col .coa-decl-primary {
  font-family: var(--coa-font-serif);
  font-size: 0.88rem;
  line-height: 1.62;
  color: var(--coa-ink-light);
  letter-spacing: 0.015em;
  border-top: none;
  padding-top: 0;
}

.is-lang-en .coa-subtitle {
  letter-spacing: 0.25em;
  font-size: 0.78rem;
}

.is-lang-en .coa-spec-value .coa-val-primary {
  font-size: 0.88rem;
}