/* ==========================================================================
   BIYT NEW MATERIALS - MENU & MENU DETAIL SPECIFICATION STYLESHEET
   1:1 Digital Reproduction of MENU.pdf and MENU详情.pdf
   ========================================================================== */

:root {
  --color-teal: #3d6d76;
  --color-teal-dark: #346270;
  --color-teal-light: #4c838e;
  --color-teal-pale: #eef5f6;
  --color-banner: #f4f6f6;
  --color-bg: #ffffff;
  --color-text-main: #0f172a;
  --color-text-body: #334155;
  --color-text-sub: #64748b;
  --color-text-muted: #94a3b8;
  --color-border: #e2e8f0;
  --color-border-dark: #cbd5e1;
  --color-accent-gold: #c5a059;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --page-max-width: 1400px;
  --header-height: 64px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text-body);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button, input {
  font-family: inherit;
}

/* ==========================================================================
   Site Header (Teal Brand Bar)
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: var(--color-teal);
  color: #ffffff;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.header-inner {
  max-width: var(--page-max-width);
  margin: 0 auto;
  height: 100%;
  padding: 0 clamp(16px, 3vw, 40px);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-brand {
  display: flex;
  align-items: baseline;
  text-decoration: none;
  color: #ffffff;
  gap: 8px;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.brand-sub {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  opacity: 0.88;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.2vw, 28px);
}

.nav-link {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color 0.15s ease, opacity 0.15s ease;
  position: relative;
  padding: 4px 0;
}

.nav-link:hover {
  color: #ffffff;
}

.nav-link.active {
  color: #ffffff;
  font-weight: 700;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-accent-gold);
  border-radius: 2px;
}

/* Language Switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  background: rgba(0, 0, 0, 0.16);
  border-radius: 4px;
  padding: 2px;
  margin-left: 8px;
}

.lang-btn {
  background: transparent;
  border: none;
  color: rgba(255, 255, 255, 0.75);
  padding: 3px 8px;
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
  border-radius: 3px;
  transition: all 0.15s;
}

.lang-btn:hover {
  color: #ffffff;
}

.lang-btn.active {
  background: rgba(255, 255, 255, 0.25);
  color: #ffffff;
}

.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}

.mobile-menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: #ffffff;
}

/* ==========================================================================
   Catalog View (1:1 from MENU.pdf)
   ========================================================================== */

.page-view {
  min-height: calc(100vh - var(--header-height) - 100px);
}

.catalog-banner {
  background-color: var(--color-banner);
  border-bottom: 1px solid var(--color-border);
  padding: 32px 0 20px;
}

.banner-inner {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 clamp(16px, 3vw, 40px);
}

.catalog-heading-wrap {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 24px;
}

.catalog-big-title {
  font-size: clamp(2rem, 3.2vw, 3rem);
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--color-text-main);
  line-height: 1;
}

.catalog-sub-title {
  font-size: clamp(1rem, 1.4vw, 1.25rem);
  font-weight: 600;
  color: var(--color-text-sub);
}

/* Toolbar: Search & Tabs */
.catalog-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}

.search-box {
  position: relative;
  flex: 1;
  min-width: 260px;
  max-width: 380px;
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
}

.search-input {
  width: 100%;
  padding: 9px 34px 9px 36px;
  font-size: 0.85rem;
  border: 1px solid var(--color-border-dark);
  border-radius: 6px;
  outline: none;
  background: #ffffff;
  color: var(--color-text-main);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.search-input:focus {
  border-color: var(--color-teal);
  box-shadow: 0 0 0 3px rgba(61, 109, 118, 0.15);
}

.search-clear-btn {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 0.75rem;
  padding: 2px 4px;
}

.series-tabs {
  display: flex;
  gap: 8px;
}

.tab-btn {
  padding: 8px 18px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  border: 1px solid var(--color-border-dark);
  background: #ffffff;
  color: var(--color-text-body);
  border-radius: 5px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.tab-btn:hover {
  border-color: var(--color-teal);
  color: var(--color-teal);
}

.tab-btn.active {
  background: var(--color-teal);
  color: #ffffff;
  border-color: var(--color-teal);
}

/* Category Pills */
.category-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.pill-btn {
  padding: 5px 14px;
  font-size: 0.78rem;
  color: var(--color-text-sub);
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.pill-btn:hover {
  border-color: var(--color-teal-light);
  color: var(--color-text-main);
}

.pill-btn.active {
  background: var(--color-teal-pale);
  color: var(--color-teal);
  border-color: var(--color-teal);
  font-weight: 600;
}

.catalog-status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.78rem;
  color: var(--color-text-sub);
  padding-top: 10px;
  border-top: 1px solid rgba(0, 0, 0, 0.06);
}

.catalog-hint {
  color: var(--color-teal);
  font-weight: 500;
}

/* Catalog Body & Sections */
.catalog-body-wrap {
  padding: 40px 0 80px;
}

.catalog-container {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 clamp(16px, 3vw, 40px);
  display: flex;
  flex-direction: column;
  gap: 56px;
}

/* Major Series Group (PETG SERIES, PP SERIES) */
.series-section {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.series-main-title {
  font-size: clamp(1.4rem, 2vw, 1.85rem);
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--color-text-main);
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-teal);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

.series-main-title .sub-count {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

/* Subcategory Block (e.g. PETG PURE COLOUR, PETG BRUSHED METAL) */
.subcategory-block {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.subcat-header {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.subcat-title {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--color-teal-dark);
  text-transform: uppercase;
}

.subcat-count {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* 10-Column Swatch Grid 1:1 matching MENU.pdf */
.swatch-grid-10 {
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: 12px;
}

@media (max-width: 1300px) {
  .swatch-grid-10 {
    grid-template-columns: repeat(8, minmax(0, 1fr));
    gap: 10px;
  }
}

@media (max-width: 1024px) {
  .swatch-grid-10 {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 10px;
  }
}

@media (max-width: 768px) {
  .swatch-grid-10 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 8px;
  }
}

@media (max-width: 480px) {
  .swatch-grid-10 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
  }
}

/* Individual Swatch Card */
.swatch-card {
  display: flex;
  flex-direction: column;
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.16s ease, box-shadow 0.16s ease, border-color 0.16s ease;
  user-select: none;
  text-align: left;
  outline: none;
}

.swatch-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-teal);
  box-shadow: 0 8px 18px rgba(61, 109, 118, 0.14);
}

.swatch-color-box {
  width: 100%;
  aspect-ratio: 1.15;
  position: relative;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.04);
}

/* Brushed Metal Procedural Sheen */
.swatch-color-box.is-brushed {
  background-image: repeating-linear-gradient(
    90deg,
    rgba(255, 255, 255, 0) 0px,
    rgba(255, 255, 255, 0.24) 1px,
    rgba(0, 0, 0, 0.08) 2px,
    rgba(255, 255, 255, 0) 3px
  );
}

/* Wood Grain Procedural Texture */
.swatch-color-box.is-wood {
  background-image: repeating-linear-gradient(
    174deg,
    rgba(0, 0, 0, 0) 0px,
    rgba(0, 0, 0, 0.08) 7px,
    rgba(255, 255, 255, 0.06) 14px
  );
}

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

.swatch-footer {
  padding: 6px 4px;
  text-align: center;
  background: #ffffff;
  border-top: 1px solid #f1f5f9;
}

.swatch-code {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-text-body);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: block;
}

.featured-mark {
  display: inline-block;
  background: var(--color-accent-gold);
  color: #ffffff;
  font-size: 0.58rem;
  font-weight: 600;
  padding: 1px 4px;
  border-radius: 2px;
  margin-top: 2px;
}

/* ==========================================================================
   Detail View (1:1 from MENU详情.pdf)
   ========================================================================== */

.detail-view {
  background-color: #ffffff;
  animation: fadeIn 0.22s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.detail-banner {
  background-color: var(--color-banner);
  border-bottom: 1px solid var(--color-border);
  padding: 24px 0 16px;
}

.detail-banner-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 10px;
}

.detail-heading-wrap {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.detail-big-title {
  font-size: 1.85rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--color-text-main);
}

.detail-sub-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text-sub);
}

.btn-back-catalog {
  background: #ffffff;
  border: 1px solid var(--color-border-dark);
  color: var(--color-teal);
  padding: 6px 14px;
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: 4px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
}

.btn-back-catalog:hover {
  background: var(--color-teal-pale);
  border-color: var(--color-teal);
}

.back-arrow {
  font-size: 1.1rem;
  line-height: 1;
}

.detail-breadcrumb {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-teal-dark);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* Detail Main Stage */
.detail-stage-wrap {
  padding: 48px 0 60px;
}

.stage-inner {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 clamp(16px, 3vw, 40px);
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: clamp(24px, 4vw, 56px);
  align-items: start;
}

@media (max-width: 900px) {
  .stage-inner {
    grid-template-columns: 1fr;
  }
}

/* Left Specimen Board Card */
.specimen-card {
  width: 100%;
  aspect-ratio: 1.18;
  position: relative;
  background-color: #f1f5f9;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--color-border-dark);
  box-shadow: 0 16px 36px -8px rgba(15, 23, 42, 0.12), 0 0 0 1px rgba(0, 0, 0, 0.03);
}

.board-lighting-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.28) 0%, rgba(0, 0, 0, 0.04) 100%);
  z-index: 2;
}

.board-texture-layer {
  width: 100%;
  height: 100%;
  position: relative;
}

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

.board-procedural {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
}

.board-procedural.is-brushed {
  background-image: repeating-linear-gradient(
    90deg,
    rgba(255, 255, 255, 0) 0px,
    rgba(255, 255, 255, 0.25) 1px,
    rgba(0, 0, 0, 0.09) 2px,
    rgba(255, 255, 255, 0) 3px
  );
}

.board-procedural.is-wood {
  background-image: repeating-linear-gradient(
    174deg,
    rgba(0, 0, 0, 0) 0px,
    rgba(0, 0, 0, 0.08) 8px,
    rgba(255, 255, 255, 0.06) 16px
  );
}

.board-watermark {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: rgba(0, 0, 0, 0.28);
  margin-bottom: 8px;
}

.board-code-display {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 800;
  color: rgba(0, 0, 0, 0.55);
}

.board-badge {
  position: absolute;
  bottom: 18px;
  right: 18px;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(6px);
  padding: 6px 14px;
  border-radius: 4px;
  display: flex;
  gap: 8px;
  align-items: baseline;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  border: 1px solid rgba(0, 0, 0, 0.06);
  z-index: 3;
}

.badge-series {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-teal);
  letter-spacing: 0.05em;
}

.badge-code {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 800;
  color: var(--color-text-main);
}

/* Right Specs Panel */
.specs-column {
  display: flex;
  flex-direction: column;
}

.detail-category-tag {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-teal);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.detail-product-title {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin: 8px 0 24px;
}

.title-zh {
  font-size: clamp(1.6rem, 2.4vw, 2.2rem);
  font-weight: 800;
  color: var(--color-text-main);
}

.title-code {
  font-family: var(--font-mono);
  font-size: clamp(1.2rem, 1.8vw, 1.6rem);
  font-weight: 700;
  color: var(--color-text-sub);
}

/* Specs Table */
.spec-table {
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 16px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.spec-row {
  display: grid;
  grid-template-columns: 88px 1fr;
  font-size: 0.84rem;
  line-height: 1.5;
}

.spec-label {
  color: var(--color-text-muted);
  font-weight: 600;
}

.spec-value {
  color: var(--color-text-body);
  font-weight: 500;
}

/* Detail Actions */
.detail-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 28px;
}

.btn-primary {
  background: var(--color-teal);
  color: #ffffff;
  border: 1px solid var(--color-teal);
  padding: 10px 24px;
  font-size: 0.84rem;
  font-weight: 600;
  border-radius: 4px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: opacity 0.15s;
}

.btn-primary:hover {
  opacity: 0.92;
}

.btn-secondary {
  background: #ffffff;
  color: var(--color-teal);
  border: 1px solid var(--color-teal);
  padding: 10px 22px;
  font-size: 0.84rem;
  font-weight: 600;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.15s;
}

.btn-secondary:hover {
  background-color: var(--color-teal-pale);
}

/* Stepper */
.swatch-stepper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 18px;
  border-top: 1px dashed var(--color-border);
}

.step-btn {
  background: #ffffff;
  border: 1px solid var(--color-border-dark);
  color: var(--color-text-body);
  padding: 6px 14px;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: 4px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: all 0.15s;
}

.step-btn:hover {
  border-color: var(--color-teal);
  color: var(--color-teal);
}

.step-indicator {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

/* Scene Showcase Section */
.scene-showcase-section {
  background-color: var(--color-banner);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 48px 0;
}

.scene-inner {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 clamp(16px, 3vw, 40px);
}

.scene-header {
  margin-bottom: 20px;
}

.scene-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 6px;
}

.scene-desc {
  font-size: 0.85rem;
  color: var(--color-text-sub);
  max-width: 720px;
}

.scene-image-frame {
  position: relative;
  border-radius: 6px;
  overflow: hidden;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.08);
}

.scene-img {
  width: 100%;
  height: auto;
  max-height: 520px;
  object-fit: cover;
  display: block;
}

.scene-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 12px 20px;
  background: linear-gradient(0deg, rgba(0, 0, 0, 0.75) 0%, transparent 100%);
  color: #ffffff;
  font-size: 0.8rem;
  font-weight: 500;
}

.scene-caption span {
  font-weight: 700;
  color: var(--color-accent-gold);
}

/* Related Swatches Section */
.related-swatches-section {
  padding: 48px 0 80px;
}

.related-inner {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 clamp(16px, 3vw, 40px);
}

.related-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 18px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: 12px;
}

@media (max-width: 1200px) {
  .related-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (max-width: 600px) {
  .related-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* Toast */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(50px);
  background: rgba(15, 23, 42, 0.92);
  color: #ffffff;
  padding: 10px 20px;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  opacity: 0;
  pointer-events: none;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 1000;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Footer */
.site-footer {
  background-color: var(--color-teal-dark);
  color: #ffffff;
  padding: 24px 0;
}

.footer-inner {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 clamp(16px, 3vw, 40px);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-size: 0.78rem;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  transition: color 0.15s;
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-copy {
  color: rgba(255, 255, 255, 0.65);
}

/* Responsive Overrides */
@media (max-width: 768px) {
  .site-nav {
    display: none;
  }
  .mobile-menu-toggle {
    display: flex;
  }
}