/* ==========================================================================
   上海黄浦拍卖有限公司 (Shanghai Huangpu Auction Co., Ltd.)
   Design System: Deep Navy (#0a192f), Champagne Gold (#c5a059), Pure White Minimalist
   Authoritative, High-End, Fully Responsive
   ========================================================================== */

:root {
  --hp-navy-dark: #06111f;
  --hp-navy: #0a192f;
  --hp-navy-light: #112240;
  --hp-navy-card: #172a45;
  --hp-navy-border: #233554;
  --hp-gold: #c5a059;
  --hp-gold-hover: #d4af37;
  --hp-gold-light: #fbf7ee;
  --hp-gold-border: rgba(197, 160, 89, 0.35);
  --hp-text-dark: #0f172a;
  --hp-text-body: #334155;
  --hp-text-muted: #64748b;
  --hp-text-light: #94a3b8;
  --hp-bg-white: #ffffff;
  --hp-bg-gray: #f8fafc;
  --hp-bg-gray-alt: #f1f5f9;
  --hp-border-subtle: #e2e8f0;
  
  --font-serif: "Noto Serif SC", "Source Han Serif SC", SimSun, "Songti SC", STSong, Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", sans-serif;
  
  --container-max: 1240px;
  --container-wide: 1440px;
}

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

html {
  font-family: var(--font-sans);
  color: var(--hp-text-dark);
  background-color: var(--hp-bg-white);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-width: 320px;
  overflow-x: hidden;
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.25s ease;
}

button, input, select, textarea {
  font-family: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

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

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

.container-wide {
  width: 100%;
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   Header & Navigation (深蓝殿堂级导航)
   ========================================================================== */

#topHeader {
  position: sticky;
  top: 0;
  background: rgba(10, 25, 47, 0.98);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(197, 160, 89, 0.25);
  z-index: 1000;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
  transition: all 0.3s ease;
}

/* Top bar with hotline & credentials */
.header-topbar {
  background: var(--hp-navy-dark);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding: 6px 0;
  font-size: 12px;
  color: var(--hp-text-light);
}

.header-topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.topbar-badge {
  background: rgba(197, 160, 89, 0.15);
  color: var(--hp-gold);
  border: 1px solid rgba(197, 160, 89, 0.4);
  padding: 1px 8px;
  border-radius: 2px;
  font-size: 11px;
  letter-spacing: 0.5px;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.topbar-hotline {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--hp-gold);
  font-weight: 600;
  letter-spacing: 0.5px;
}

.lang-switch-box {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.05);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.lang-btn {
  font-size: 11px;
  color: var(--hp-text-light);
  padding: 2px 6px;
  border-radius: 2px;
  transition: all 0.2s ease;
}

.lang-btn:hover, .lang-btn.active {
  color: var(--hp-gold);
  background: rgba(197, 160, 89, 0.12);
  font-weight: 600;
}

.lang-sep {
  color: rgba(255, 255, 255, 0.2);
}

/* Main Nav */
.header-main-nav {
  height: 76px;
}

.header-main-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* LOGO */
.brand-logo-wrap {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-emblem {
  width: 44px;
  height: 44px;
  border: 1px solid var(--hp-gold);
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: radial-gradient(circle, #162b4d 0%, #0a192f 100%);
  box-shadow: 0 0 12px rgba(197, 160, 89, 0.2);
}

.brand-emblem span {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--hp-gold);
  letter-spacing: 1px;
}

.brand-titles {
  display: flex;
  flex-direction: column;
}

.brand-name-cn {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 2px;
  line-height: 1.2;
}

.brand-name-en {
  font-size: 9px;
  color: var(--hp-gold);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-top: 2px;
  font-weight: 500;
}

/* Menu Links */
.nav-menu-list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link-item {
  position: relative;
}

.nav-link {
  display: inline-block;
  padding: 10px 16px;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.88);
  font-weight: 500;
  letter-spacing: 0.5px;
  transition: all 0.25s ease;
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--hp-gold);
  transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-link:hover, .nav-link.active {
  color: var(--hp-gold);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 24px;
}

/* Highlight badge for Consignment */
.nav-badge-consignment {
  background: linear-gradient(135deg, #c5a059, #e2c275);
  color: var(--hp-navy-dark);
  font-size: 10px;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 10px;
  margin-left: 4px;
  vertical-align: middle;
}

/* Contact button in Nav */
.nav-contact-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--hp-gold), #dfb868);
  color: var(--hp-navy-dark);
  font-weight: 600;
  font-size: 14px;
  padding: 8px 18px;
  border-radius: 3px;
  margin-left: 14px;
  box-shadow: 0 2px 10px rgba(197, 160, 89, 0.3);
  transition: all 0.25s ease;
}

.nav-contact-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(197, 160, 89, 0.45);
}

.mobile-nav-toggle {
  display: none;
  color: #fff;
  font-size: 26px;
}

/* Mobile Drawer */
.mobile-drawer {
  position: fixed;
  top: 0;
  right: -100%;
  width: 280px;
  height: 100vh;
  background: var(--hp-navy-dark);
  border-left: 1px solid var(--hp-gold-border);
  box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
  z-index: 1050;
  transition: right 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  padding: 30px 24px;
  display: flex;
  flex-direction: column;
}

.mobile-drawer.open {
  right: 0;
}

.mobile-drawer-close {
  align-self: flex-end;
  color: var(--hp-gold);
  font-size: 24px;
  margin-bottom: 24px;
}

.mobile-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.mobile-nav-links a {
  font-size: 16px;
  color: #fff;
  display: block;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.mobile-nav-links a:hover, .mobile-nav-links a.active {
  color: var(--hp-gold);
}

/* ==========================================================================
   一、全屏轮播大图 (Hero Carousel)
   ========================================================================== */

.hero-slider-section {
  position: relative;
  background: #040911;
  overflow: hidden;
}

.hero-viewport {
  position: relative;
  height: 620px;
  width: 100%;
}

.hero-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  visibility: hidden;
  transition: opacity 1s cubic-bezier(0.16, 1, 0.3, 1), transform 1.2s ease;
  transform: scale(1.04);
}

.hero-slide.active {
  opacity: 1;
  visibility: visible;
  transform: scale(1);
}

.hero-slide-bg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: brightness(0.65);
}

.hero-slide-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg, 
    rgba(6, 17, 31, 0.95) 0%, 
    rgba(10, 25, 47, 0.75) 45%, 
    rgba(10, 25, 47, 0.2) 100%
  );
  display: flex;
  align-items: center;
}

.hero-content {
  max-width: 680px;
  color: #ffffff;
}

.hero-tagline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--hp-gold);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 16px;
  padding: 4px 12px;
  background: rgba(197, 160, 89, 0.12);
  border: 1px solid rgba(197, 160, 89, 0.3);
  border-radius: 2px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 42px;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 1.5px;
  margin-bottom: 18px;
  text-shadow: 0 4px 16px rgba(0, 0, 0, 0.6);
}

.hero-title span {
  color: var(--hp-gold);
}

.hero-desc {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.7;
  margin-bottom: 28px;
  font-weight: 300;
}

.hero-actions {
  display: flex;
  gap: 16px;
  align-items: center;
}

.btn-hero-primary {
  padding: 12px 28px;
  background: linear-gradient(135deg, var(--hp-gold), #dfb868);
  color: var(--hp-navy-dark);
  font-size: 15px;
  font-weight: 700;
  border-radius: 3px;
  letter-spacing: 1px;
  box-shadow: 0 4px 16px rgba(197, 160, 89, 0.35);
  transition: all 0.25s ease;
}

.btn-hero-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(197, 160, 89, 0.5);
}

.btn-hero-secondary {
  padding: 12px 26px;
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.3);
  font-size: 15px;
  font-weight: 500;
  border-radius: 3px;
  backdrop-filter: blur(4px);
  transition: all 0.25s ease;
}

.btn-hero-secondary:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: #ffffff;
}

/* Hero Nav Buttons & Dots */
.hero-nav-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(10, 25, 47, 0.6);
  border: 1px solid rgba(197, 160, 89, 0.3);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  transition: all 0.25s ease;
  backdrop-filter: blur(6px);
  z-index: 10;
}

.hero-nav-arrow:hover {
  background: var(--hp-gold);
  color: var(--hp-navy-dark);
  border-color: var(--hp-gold);
  transform: translateY(-50%) scale(1.08);
}

.hero-arrow-prev {
  left: 28px;
}

.hero-arrow-next {
  right: 28px;
}

.hero-indicators {
  position: absolute;
  bottom: 30px;
  right: 48px;
  display: flex;
  gap: 10px;
  z-index: 10;
}

.hero-ind-item {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.35);
  border: 1px solid rgba(0, 0, 0, 0.2);
  cursor: pointer;
  transition: all 0.3s ease;
}

.hero-ind-item.active {
  width: 28px;
  border-radius: 6px;
  background: var(--hp-gold);
  box-shadow: 0 0 10px rgba(197, 160, 89, 0.6);
}

/* ==========================================================================
   Section Common Heading
   ========================================================================== */

.site-section {
  padding: 80px 0;
}

.section-navy-bg {
  background: var(--hp-navy);
  color: #ffffff;
}

.section-gray-bg {
  background: var(--hp-bg-gray);
}

.section-header-center {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 52px;
}

.section-tag-gold {
  display: inline-block;
  color: var(--hp-gold);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 8px;
  position: relative;
}

.section-main-title {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 700;
  letter-spacing: 1px;
  line-height: 1.35;
  margin-bottom: 14px;
}

.section-header-center.light .section-main-title {
  color: #ffffff;
}

.section-header-center.dark .section-main-title {
  color: var(--hp-navy-dark);
}

.section-title-divider {
  width: 50px;
  height: 2px;
  background: var(--hp-gold);
  margin: 12px auto 16px;
}

.section-sub-desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--hp-text-muted);
}

.section-header-center.light .section-sub-desc {
  color: var(--hp-text-light);
}

/* ==========================================================================
   二、本季拍卖预告 (Auction Preview Cards)
   ========================================================================== */

.preview-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.preview-card {
  background: #ffffff;
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid var(--hp-border-subtle);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
}

.preview-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 36px rgba(10, 25, 47, 0.12);
  border-color: var(--hp-gold);
}

.preview-card-img-wrap {
  position: relative;
  height: 220px;
  background: #111a26;
  overflow: hidden;
}

.preview-card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.preview-card:hover .preview-card-img {
  transform: scale(1.08);
}

.preview-status-pill {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(10, 25, 47, 0.88);
  color: var(--hp-gold);
  border: 1px solid rgba(197, 160, 89, 0.4);
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 2px;
  font-weight: 600;
  letter-spacing: 0.5px;
  backdrop-filter: blur(4px);
}

.preview-status-pill.live {
  background: #a73843;
  color: #ffffff;
  border-color: #a73843;
}

.preview-card-body {
  padding: 22px 20px 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.preview-card-category {
  font-size: 12px;
  color: var(--hp-gold);
  font-weight: 600;
  margin-bottom: 6px;
  letter-spacing: 1px;
}

.preview-card-title {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--hp-navy);
  line-height: 1.45;
  margin-bottom: 14px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.preview-meta-list {
  list-style: none;
  font-size: 13px;
  color: var(--hp-text-muted);
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
  border-top: 1px solid var(--hp-border-subtle);
  padding-top: 14px;
}

.preview-meta-list li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.preview-meta-list svg {
  color: var(--hp-gold);
  flex-shrink: 0;
}

.preview-card-btn {
  width: 100%;
  padding: 10px;
  text-align: center;
  background: var(--hp-navy);
  color: #ffffff;
  border-radius: 2px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.5px;
  transition: all 0.25s ease;
  border: 1px solid var(--hp-navy);
}

.preview-card-btn:hover {
  background: var(--hp-gold);
  color: var(--hp-navy-dark);
  border-color: var(--hp-gold);
  box-shadow: 0 4px 12px rgba(197, 160, 89, 0.35);
}

/* ==========================================================================
   三、核心板块：藏品征集专区 (Consignment Focus)
   ========================================================================== */

.consignment-section-wrap {
  position: relative;
  background: radial-gradient(circle at top right, #112644 0%, #0a192f 100%);
  color: #ffffff;
  padding: 90px 0;
}

.consignment-intro-box {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(197, 160, 89, 0.25);
  border-radius: 4px;
  padding: 32px 36px;
  margin-bottom: 48px;
  backdrop-filter: blur(8px);
}

.consignment-intro-p {
  font-size: 16px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.92);
  margin-bottom: 20px;
}

.consignment-intro-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  border-top: 1px solid rgba(197, 160, 89, 0.2);
  padding-top: 22px;
}

.feat-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.feat-icon-box {
  width: 36px;
  height: 36px;
  background: rgba(197, 160, 89, 0.15);
  border: 1px solid rgba(197, 160, 89, 0.4);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--hp-gold);
  flex-shrink: 0;
}

.feat-text h5 {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 4px;
}

.feat-text p {
  font-size: 12px;
  color: var(--hp-text-light);
  line-height: 1.5;
}

/* Categories Grid */
.consignment-cat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 56px;
}

.cat-tile {
  background: rgba(17, 34, 64, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  padding: 24px 22px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.cat-tile::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--hp-gold);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.cat-tile:hover {
  background: rgba(23, 42, 69, 0.85);
  border-color: rgba(197, 160, 89, 0.4);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.cat-tile:hover::before {
  opacity: 1;
}

.cat-tile-title {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--hp-gold);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.cat-tile-desc {
  font-size: 13px;
  color: var(--hp-text-light);
  line-height: 1.6;
}

/* Online Consignment Interactive Form */
.consignment-form-container {
  background: #ffffff;
  color: var(--hp-text-dark);
  border-radius: 6px;
  padding: 44px 48px;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4);
  border: 1px solid var(--hp-gold-border);
}

.form-header {
  text-align: center;
  margin-bottom: 32px;
}

.form-title {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--hp-navy-dark);
  margin-bottom: 8px;
}

.form-sub {
  font-size: 14px;
  color: var(--hp-text-muted);
}

.form-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 18px;
}

.form-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--hp-navy);
}

.form-label span.req {
  color: #dc2626;
  margin-left: 2px;
}

.form-control {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--hp-border-subtle);
  border-radius: 3px;
  font-size: 14px;
  color: var(--hp-text-dark);
  background: #fff;
  transition: all 0.25s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--hp-gold);
  box-shadow: 0 0 0 3px rgba(197, 160, 89, 0.15);
}

.upload-dropzone {
  border: 2px dashed rgba(197, 160, 89, 0.5);
  background: #fafaf9;
  border-radius: 4px;
  padding: 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.25s ease;
}

.upload-dropzone:hover {
  background: #fbf7ee;
  border-color: var(--hp-gold);
}

.upload-icon {
  color: var(--hp-gold);
  margin-bottom: 8px;
}

.upload-tip {
  font-size: 12px;
  color: var(--hp-text-muted);
}

.btn-submit-consignment {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--hp-navy), #162b4d);
  color: var(--hp-gold);
  border: 1px solid var(--hp-gold);
  font-size: 16px;
  font-weight: 700;
  border-radius: 3px;
  letter-spacing: 1.5px;
  transition: all 0.25s ease;
  margin-top: 10px;
}

.btn-submit-consignment:hover {
  background: var(--hp-gold);
  color: var(--hp-navy-dark);
  box-shadow: 0 6px 20px rgba(197, 160, 89, 0.4);
}

/* ==========================================================================
   四、精品拍品展示 (Gallery Masterpieces Grid)
   ========================================================================== */

.gallery-tabs-wrap {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.gallery-tab-btn {
  padding: 8px 20px;
  font-size: 14px;
  color: var(--hp-text-body);
  background: #ffffff;
  border: 1px solid var(--hp-border-subtle);
  border-radius: 2px;
  font-weight: 500;
  transition: all 0.25s ease;
}

.gallery-tab-btn:hover {
  border-color: var(--hp-gold);
  color: var(--hp-gold);
}

.gallery-tab-btn.active {
  background: var(--hp-navy);
  color: var(--hp-gold);
  border-color: var(--hp-navy);
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(10, 25, 47, 0.2);
}

.masterpiece-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.masterpiece-card {
  background: #ffffff;
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid var(--hp-border-subtle);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
}

.masterpiece-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.1);
  border-color: var(--hp-gold);
}

.masterpiece-img-box {
  position: relative;
  height: 280px;
  background: #f8fafc;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.masterpiece-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.masterpiece-card:hover .masterpiece-img {
  transform: scale(1.08);
}

.lot-tag-badge {
  position: absolute;
  top: 14px;
  left: 14px;
  background: rgba(10, 25, 47, 0.88);
  color: #ffffff;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 2px;
  letter-spacing: 0.5px;
  backdrop-filter: blur(4px);
}

.masterpiece-info {
  padding: 22px 20px 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.masterpiece-dynasty {
  font-size: 12px;
  color: var(--hp-gold);
  font-weight: 600;
  margin-bottom: 6px;
}

.masterpiece-title {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--hp-navy);
  line-height: 1.4;
  margin-bottom: 10px;
  cursor: pointer;
  transition: color 0.2s ease;
}

.masterpiece-title:hover {
  color: var(--hp-gold);
}

.masterpiece-dim {
  font-size: 13px;
  color: var(--hp-text-muted);
  margin-bottom: 16px;
  border-bottom: 1px dashed var(--hp-border-subtle);
  padding-bottom: 12px;
}

.masterpiece-prices {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 16px;
}

.price-label {
  font-size: 12px;
  color: var(--hp-text-muted);
}

.price-val {
  font-size: 16px;
  font-weight: 700;
  color: var(--hp-navy-dark);
}

.price-val.hammer {
  color: #a73843;
}

.masterpiece-action-btn {
  width: 100%;
  padding: 10px;
  background: #ffffff;
  border: 1px solid var(--hp-navy);
  color: var(--hp-navy);
  font-size: 13px;
  font-weight: 600;
  border-radius: 2px;
  transition: all 0.25s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.masterpiece-action-btn:hover {
  background: var(--hp-navy);
  color: #ffffff;
}

/* ==========================================================================
   五、公司简介 (Corporate Profile)
   ========================================================================== */

.about-section-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.about-text-col {
  padding-right: 20px;
}

.about-lead-p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--hp-text-body);
  margin-bottom: 20px;
}

.about-features-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 28px 0;
}

.about-feat-box {
  background: var(--hp-bg-gray);
  border: 1px solid var(--hp-border-subtle);
  padding: 16px 18px;
  border-radius: 3px;
  border-left: 3px solid var(--hp-gold);
}

.about-feat-box h6 {
  font-size: 14px;
  font-weight: 700;
  color: var(--hp-navy);
  margin-bottom: 4px;
}

.about-feat-box p {
  font-size: 12px;
  color: var(--hp-text-muted);
  line-height: 1.5;
}

.about-stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  border-top: 1px solid var(--hp-border-subtle);
  padding-top: 24px;
  margin-top: 24px;
}

.stat-item {
  text-align: center;
}

.stat-num {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 700;
  color: var(--hp-navy);
  line-height: 1.2;
}

.stat-num span {
  font-size: 16px;
  color: var(--hp-gold);
}

.stat-label {
  font-size: 12px;
  color: var(--hp-text-muted);
  margin-top: 4px;
}

.about-visual-col {
  position: relative;
}

.about-visual-main {
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(10, 25, 47, 0.15);
  border: 4px solid #ffffff;
}

.about-visual-main img {
  width: 100%;
  height: 420px;
  object-fit: cover;
}

.about-cert-card {
  position: absolute;
  bottom: -24px;
  left: -24px;
  background: var(--hp-navy-dark);
  color: #ffffff;
  border: 1px solid var(--hp-gold);
  border-radius: 4px;
  padding: 20px 24px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
  max-width: 280px;
}

.cert-card-title {
  color: var(--hp-gold);
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 6px;
  letter-spacing: 0.5px;
}

.cert-card-desc {
  font-size: 12px;
  color: var(--hp-text-light);
  line-height: 1.5;
}

/* ==========================================================================
   六、网站底部页脚 (Footer - 全站统一)
   ========================================================================== */

#siteFooter {
  background: var(--hp-navy-dark);
  color: var(--hp-text-light);
  font-size: 13px;
  border-top: 2px solid var(--hp-gold);
}

.footer-top-info {
  padding: 60px 0 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-grid-4 {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
}

.footer-brand h4 {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 14px;
  letter-spacing: 1px;
}

.footer-brand p {
  line-height: 1.7;
  color: var(--hp-text-light);
  margin-bottom: 20px;
}

.footer-col-title {
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 18px;
  letter-spacing: 0.5px;
  position: relative;
  padding-bottom: 8px;
}

.footer-col-title::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--hp-gold);
}

.footer-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-nav-links a {
  color: var(--hp-text-light);
  transition: all 0.2s ease;
}

.footer-nav-links a:hover {
  color: var(--hp-gold);
  transform: translateX(4px);
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 14px;
  line-height: 1.5;
}

.footer-contact-item svg {
  color: var(--hp-gold);
  flex-shrink: 0;
  margin-top: 2px;
}

.footer-copyright-wrap {
  padding: 28px 0;
  text-align: center;
  color: rgba(255, 255, 255, 0.5);
  font-size: 12px;
  line-height: 1.8;
}

.footer-copyright-wrap p {
  margin-bottom: 8px;
}

.footer-compliance-row {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-compliance-row span {
  color: var(--hp-text-light);
}

/* ==========================================================================
   Modals & Live Chat (客服与藏品详情弹窗)
   ========================================================================== */

/* Lot Detail Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(6, 17, 31, 0.75);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 2000;
  padding: 20px;
}

.modal-overlay.show {
  opacity: 1;
  visibility: visible;
}

.modal-window {
  background: #ffffff;
  border-radius: 4px;
  max-width: 920px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.4);
  position: relative;
  border: 1px solid var(--hp-gold-border);
}

.modal-close-icon {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--hp-bg-gray);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--hp-navy);
  font-size: 18px;
  transition: all 0.2s ease;
  z-index: 10;
}

.modal-close-icon:hover {
  background: var(--hp-navy);
  color: #ffffff;
}

.modal-lot-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.modal-lot-image-pane {
  background: #0d1a2d;
  padding: 30px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.modal-main-img-box {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 320px;
}

.modal-main-img-box img {
  max-height: 420px;
  max-width: 100%;
  object-fit: contain;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
  border-radius: 2px;
  transition: opacity 0.2s ease;
}

.modal-lot-thumbs-wrapper {
  width: 100%;
}

.modal-lot-thumbs-hint {
  font-size: 11px;
  color: var(--hp-gold);
  margin-bottom: 6px;
  font-weight: 600;
}

.modal-lot-thumbs-row {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.modal-lot-thumb-item {
  width: 58px;
  height: 58px;
  flex-shrink: 0;
  border-radius: 3px;
  overflow: hidden;
  border: 2px solid rgba(255, 255, 255, 0.2);
  cursor: pointer;
  transition: all 0.2s ease;
}

.modal-lot-thumb-item:hover,
.modal-lot-thumb-item.active {
  border-color: var(--hp-gold);
  transform: translateY(-2px);
  box-shadow: 0 0 10px rgba(197, 160, 89, 0.5);
}

.modal-lot-thumb-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Consignment Live Multi-Image Preview */
.consign-preview-gallery {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  background: rgba(17, 34, 64, 0.5);
  border: 1px solid rgba(197, 160, 89, 0.3);
  padding: 12px;
  border-radius: 4px;
}

.consign-preview-card {
  position: relative;
  width: 72px;
  height: 72px;
  border-radius: 3px;
  overflow: hidden;
  border: 1px solid rgba(197, 160, 89, 0.4);
}

.consign-preview-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.modal-lot-info-pane {
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
}

/* Floating Online Customer Service Widget */
.floating-cs-button {
  position: fixed;
  bottom: 36px;
  right: 36px;
  background: linear-gradient(135deg, var(--hp-navy), #162b4d);
  color: var(--hp-gold);
  border: 2px solid var(--hp-gold);
  border-radius: 30px;
  padding: 12px 22px;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 8px 24px rgba(10, 25, 47, 0.35);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  z-index: 999;
  transition: all 0.25s ease;
}

.floating-cs-button:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 12px 30px rgba(197, 160, 89, 0.4);
  background: var(--hp-gold);
  color: var(--hp-navy-dark);
}

/* Live Chat Dialog */
.chat-window {
  position: fixed;
  bottom: 96px;
  right: 36px;
  width: 360px;
  height: 500px;
  background: #ffffff;
  border-radius: 8px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
  border: 1px solid var(--hp-gold-border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.95);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.chat-window.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.chat-header {
  background: var(--hp-navy);
  color: #ffffff;
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--hp-gold-border);
}

.chat-header-title h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--hp-gold);
}

.chat-header-title span {
  font-size: 11px;
  color: var(--hp-text-light);
}

.chat-body {
  flex: 1;
  padding: 18px;
  overflow-y: auto;
  background: #f8fafc;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.chat-msg {
  max-width: 82%;
  padding: 10px 14px;
  border-radius: 6px;
  font-size: 13px;
  line-height: 1.5;
}

.chat-msg.agent {
  background: #ffffff;
  color: var(--hp-text-dark);
  border: 1px solid var(--hp-border-subtle);
  align-self: flex-start;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
}

.chat-msg.user {
  background: var(--hp-navy);
  color: #ffffff;
  align-self: flex-end;
}

.chat-footer {
  padding: 12px 14px;
  background: #ffffff;
  border-top: 1px solid var(--hp-border-subtle);
  display: flex;
  gap: 8px;
}

.chat-input {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--hp-border-subtle);
  border-radius: 4px;
  font-size: 13px;
}

.chat-input:focus {
  outline: none;
  border-color: var(--hp-gold);
}

.chat-send-btn {
  padding: 8px 14px;
  background: var(--hp-navy);
  color: var(--hp-gold);
  border-radius: 4px;
  font-size: 13px;
  font-weight: 600;
}

/* Toast */
.hp-toast {
  position: fixed;
  top: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background: rgba(10, 25, 47, 0.95);
  color: #ffffff;
  border: 1px solid var(--hp-gold);
  padding: 12px 24px;
  border-radius: 4px;
  font-size: 14px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 3000;
  display: flex;
  align-items: center;
  gap: 10px;
}

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

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */

@media (max-width: 1200px) {
  .preview-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .masterpiece-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-section-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .footer-grid-4 {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 900px) {
  .nav-menu-list, .nav-contact-btn {
    display: none;
  }
  .mobile-nav-toggle {
    display: block;
  }
  .hero-viewport {
    height: 480px;
  }
  .hero-title {
    font-size: 30px;
  }
  .consignment-cat-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .consignment-intro-features {
    grid-template-columns: 1fr;
  }
  .modal-lot-grid {
    grid-template-columns: 1fr;
  }
  .modal-lot-image-pane {
    max-height: 300px;
    padding: 20px;
  }
}

@media (max-width: 640px) {
  .header-topbar {
    display: none;
  }
  .hero-viewport {
    height: 420px;
  }
  .hero-title {
    font-size: 24px;
  }
  .hero-desc {
    font-size: 14px;
  }
  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }
  .preview-cards-grid,
  .masterpiece-grid,
  .consignment-cat-grid,
  .form-grid-2,
  .about-features-list,
  .about-stats-row {
    grid-template-columns: 1fr;
  }
  .consignment-form-container {
    padding: 24px 20px;
  }
  .footer-grid-4 {
    grid-template-columns: 1fr;
  }
  .chat-window {
    width: calc(100vw - 32px);
    right: 16px;
    bottom: 80px;
  }
  .floating-cs-button {
    bottom: 20px;
    right: 20px;
    padding: 10px 16px;
    font-size: 13px;
  }
}




/* ==========================================================================
   全局在线客服弹窗稳定版样式 (PC & 移动端绝对定位防跑偏)
   ========================================================================== */
.chat-window {
  position: fixed !important;
  bottom: 96px !important;
  right: 36px !important;
  top: auto !important;
  left: auto !important;
  width: 380px !important;
  max-width: calc(100vw - 32px) !important;
  height: 520px !important;
  max-height: calc(100vh - 120px) !important;
  background: #ffffff !important;
  border-radius: 12px !important;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4) !important;
  border: 1px solid var(--hp-gold-border) !important;
  display: flex !important;
  flex-direction: column !important;
  overflow: hidden !important;
  z-index: 99999 !important;
  opacity: 0 !important;
  visibility: hidden !important;
  pointer-events: none !important;
  transform: translateY(20px) !important;
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease !important;
}

.chat-window.open {
  opacity: 1 !important;
  visibility: visible !important;
  pointer-events: auto !important;
  transform: translateY(0) !important;
}

.chat-header {
  background: var(--hp-navy) !important;
  color: #ffffff !important;
  padding: 14px 18px !important;
  display: flex !important;
  justify-content: space-between !important;
  align-items: center !important;
  border-bottom: 1px solid var(--hp-gold-border) !important;
  flex-shrink: 0 !important;
}

.chat-body {
  flex: 1 !important;
  padding: 16px !important;
  overflow-y: auto !important;
  background: #f8fafc !important;
  display: flex !important;
  flex-direction: column !important;
  gap: 12px !important;
}

.chat-footer {
  padding: 12px 16px !important;
  background: #ffffff !important;
  border-top: 1px solid #e2e8f0 !important;
  display: flex !important;
  gap: 8px !important;
  flex-shrink: 0 !important;
}

.chat-input {
  flex: 1 !important;
  height: 42px !important;
  border: 1px solid #cbd5e1 !important;
  border-radius: 6px !important;
  padding: 0 12px !important;
  font-size: 16px !important; /* >=16px 防缩放 */
  outline: none !important;
  color: #0f172a !important;
  background: #ffffff !important;
}

.chat-send-btn {
  height: 42px !important;
  padding: 0 18px !important;
  background: var(--hp-gold-gradient) !important;
  color: var(--hp-navy-dark) !important;
  font-weight: 700 !important;
  border: none !important;
  border-radius: 6px !important;
  cursor: pointer !important;
}

/* ---------------- 移动端全屏/贴底适配 ---------------- */
@media screen and (max-width: 768px) {
  .chat-window {
    bottom: 0 !important;
    left: 0 !important;
    right: 0 !important;
    top: auto !important;
    width: 100vw !important;
    max-width: 100vw !important;
    height: 75vh !important;
    height: 75dvh !important;
    max-height: 85vh !important;
    border-radius: 16px 16px 0 0 !important;
    border: none !important;
    border-top: 2px solid var(--hp-gold) !important;
    transform: translateY(100%) !important;
  }

  .chat-window.open {
    transform: translateY(0) !important;
  }

  .chat-footer {
    padding-bottom: calc(12px + env(safe-area-inset-bottom, 0px)) !important;
  }
}