/* ========================================
   嘉诚达集团官网 · 全局样式
   Design: 深炭黑 + 嘉诚达红 + 金属灰
   ======================================== */

/* ---------- 设计 Token ---------- */
:root {
  /* 颜色 */
  --color-bg: #0F1115;
  --color-bg-card: #1A1D24;
  --color-bg-card-2: #232730;
  --color-fg: #F5F5F7;
  --color-fg-muted: #A0A4AC;
  --color-fg-dim: #6B6F78;
  --color-accent: #E60012;
  --color-accent-hover: #FF1A2C;
  --color-accent-dim: rgba(230, 0, 18, 0.12);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-strong: rgba(255, 255, 255, 0.18);

  /* 字体 */
  --font-sans: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC",
               "Noto Sans SC", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", Menlo, monospace;

  /* 字号 */
  --fs-xs: 12px;
  --fs-sm: 13px;
  --fs-base: 14px;
  --fs-md: 16px;
  --fs-lg: 18px;
  --fs-xl: 22px;
  --fs-2xl: 28px;
  --fs-3xl: 36px;
  --fs-4xl: 48px;
  --fs-hero: 60px;

  /* 字重 */
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;

  /* 圆角 */
  --r-sm: 4px;
  --r-md: 6px;
  --r-lg: 8px;
  --r-xl: 12px;

  /* 间距 */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-8: 32px;
  --sp-10: 40px;
  --sp-12: 48px;
  --sp-16: 64px;
  --sp-20: 80px;

  /* 容器 */
  --container-max: 1200px;
  --header-h: 64px;
  --tabbar-h: 60px;

  /* 过渡 */
  --t-fast: 0.15s ease;
  --t-base: 0.25s ease;
}

/* ---------- 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  background: var(--color-bg);
  color: var(--color-fg);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  font-weight: var(--fw-regular);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding-bottom: env(safe-area-inset-bottom, 0);
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; transition: color var(--t-fast); }
button { background: transparent; border: none; color: inherit; font: inherit; cursor: pointer; }
ul, ol { list-style: none; }
input, textarea, select { font: inherit; color: inherit; }

/* ---------- 容器 ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--sp-6);
}

/* ---------- 顶部导航 ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(15, 17, 21, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 0.5px solid var(--color-border);
}
.header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--sp-6);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-size: var(--fs-md);
  font-weight: var(--fw-medium);
  letter-spacing: 0.5px;
}
.brand-logo {
  height: 48px;
  width: auto;
  display: block;
  flex-shrink: 0;
}
.brand-mark {
  width: 40px;       /* V29 徽章 logo navbar 尺寸：40×40 方形 */
  height: 40px;
  display: block;
  flex-shrink: 0;
  background: transparent;
  border-radius: 0;
  /* V29: 红色徽章 logo,浅深色都通用,不跟随主题色 */
}
.brand-name {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.brand-name strong { font-size: var(--fs-md); font-weight: var(--fw-medium); }
.brand-name small { font-size: 10px; color: var(--color-fg-muted); letter-spacing: 1.5px; margin-top: 2px; }

.nav-desktop {
  display: flex;
  gap: 40px;            /* V13: 加宽间距 → 40px */
  font-size: 17px;       /* V13: 15px → 17px (Apple 风标准) */
  font-weight: var(--fw-regular);
}
.nav-desktop a {
  color: var(--color-fg);                 /* V13: muted → fg，更清晰 */
  font-weight: var(--fw-medium);          /* V13: regular → medium 加粗 */
  font-size: 17px;                        /* V13: 显式声明 */
  letter-spacing: 0.2px;                  /* V13: 加宽字距 */
  position: relative;
  padding: 4px 0;
  transition: color var(--t-fast);
}
.nav-desktop a:hover,
.nav-desktop a.active {
  color: var(--color-fg);
}
.nav-desktop a.active::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  background: var(--color-accent);
}
/* ---------- V59: header 联系方式扩展 ---------- */
.header-cta {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-size: var(--fs-sm);
}
.header-phone {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
  border-left: 0.5px solid var(--color-border);
  padding-left: var(--sp-3);
}
.header-phone strong {
  color: var(--color-accent);
  font-weight: var(--fw-medium);
  font-size: 15px;
  letter-spacing: 0.4px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.header-phone strong svg { width: 12px; height: 12px; }
.header-phone-sub {
  color: var(--color-fg-muted);
  font-size: 10.5px;
  letter-spacing: 0.2px;
  margin-top: 3px;
}

.header-qr-group {
  display: flex;
  gap: 8px;
  padding-left: var(--sp-3);
  border-left: 0.5px solid var(--color-border);
}
.header-qr-btn {
  position: relative;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 0.5px solid var(--color-border-strong);
  background: rgba(255, 255, 255, 0.04);
  color: var(--color-fg);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 200ms, border-color 200ms, color 200ms;
  padding: 0;
}
.header-qr-btn:hover,
.header-qr-btn:focus-visible {
  background: rgba(230, 0, 18, 0.14);
  border-color: var(--color-accent);
  color: var(--color-accent);
  outline: none;
}
.header-qr-btn svg { width: 15px; height: 15px; }

.qr-popover {
  position: absolute;
  top: calc(100% + 14px);
  right: 0;
  background: rgba(15, 17, 21, 0.98);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 0.5px solid var(--color-border-strong);
  border-radius: var(--r-lg);
  padding: var(--sp-4);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
  width: 184px;
  z-index: 110;
  text-align: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 200ms, transform 200ms, visibility 200ms;
  pointer-events: none;
}
.qr-popover.show,
.header-qr-btn:hover .qr-popover,
.header-qr-btn:focus-within .qr-popover {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}
.qr-popover::before {
  content: '';
  position: absolute;
  top: -6px;
  right: 16px;
  width: 12px;
  height: 12px;
  background: rgba(15, 17, 21, 0.98);
  border-top: 0.5px solid var(--color-border-strong);
  border-left: 0.5px solid var(--color-border-strong);
  transform: rotate(45deg);
}
.qr-popover img {
  width: 148px;
  height: 148px;
  border-radius: 4px;
  display: block;
  margin: 0 auto;
  background: #fff;
  padding: 4px;
}
.qr-popover-cap {
  font-size: 12px;
  color: var(--color-fg);
  font-weight: var(--fw-medium);
  margin-top: 8px;
  letter-spacing: 0.2px;
}
.qr-popover-sub {
  font-size: 10.5px;
  color: var(--color-fg-muted);
  margin-top: 2px;
}

/* ---------- V59: 顶部 topbar 细条 ---------- */
.topbar {
  background: rgba(0, 0, 0, 0.34);
  border-bottom: 0.5px solid var(--color-border);
  height: 32px;
  font-size: 11.5px;
  color: var(--color-fg-muted);
}
.topbar-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--sp-6);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
}
.topbar-hours {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  letter-spacing: 0.2px;
}
.topbar-hours-icon {
  width: 11px;
  height: 11px;
  color: var(--color-accent);
  flex-shrink: 0;
}
.topbar-contacts {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}
.topbar-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--color-fg-muted);
  text-decoration: none;
  transition: color 200ms;
  letter-spacing: 0.2px;
}
.topbar-link:hover {
  color: var(--color-fg);
}
.topbar-link svg {
  width: 11px;
  height: 11px;
  color: var(--color-accent);
  flex-shrink: 0;
}
.topbar-sep {
  color: var(--color-fg-dim);
  font-size: 10px;
}

/* 中等屏幕(<1280):topbar 工作时间收起,CTA 副号收起 */
@media (max-width: 1279px) {
  .topbar-hours { display: none; }
  .header-phone-sub { display: none; }
}
@media (max-width: 960px) {
  .topbar { display: none; }
}

/* ---------- 桌面端 mega menu（V51） ---------- */
.nav-desktop > .nav-item { display: flex; align-items: center; }
.nav-desktop > .nav-item--mega { position: static; }

.nav-trigger {
  background: none;
  border: 0;
  padding: 4px 0;
  font: inherit;
  color: var(--color-fg);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  letter-spacing: 0.2px;
  font-weight: var(--fw-medium);
  font-size: 17px;
  transition: color var(--t-fast);
}
.nav-trigger:hover,
.nav-item--mega.is-open .nav-trigger { color: var(--color-accent); }
.nav-chevron {
  width: 12px; height: 12px;
  transition: transform var(--t-fast);
  color: var(--color-fg-muted);
}
.nav-item--mega.is-open .nav-chevron { transform: rotate(180deg); color: var(--color-accent); }

/* 全宽跨页 mega 面板：相对 .header 定位，left/right 撑到屏宽 */
.mega-menu {
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  background: var(--color-bg);
  border-top: 0.5px solid var(--color-border);
  border-bottom: 0.5px solid var(--color-border);
  box-shadow: 0 24px 48px -12px rgba(15, 23, 42, 0.12);
  padding: 40px 0 44px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
  pointer-events: none;
  z-index: 90;
}
.nav-item--mega.is-open .mega-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.mega-inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 56px;
}
.mega-title {
  font-size: 13px;
  font-weight: var(--fw-medium);
  letter-spacing: 3px;
  color: var(--color-fg-muted);
  text-transform: uppercase;
  margin: 0 0 18px;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--color-border);
  position: relative;
}
.mega-title::before {
  content: '';
  position: absolute;
  left: 0; bottom: -1px;
  width: 28px; height: 1px;
  background: var(--color-accent);
}
.mega-title-en {
  font-size: 11px;
  letter-spacing: 1.5px;
  color: var(--color-fg-dim);
  font-weight: var(--fw-regular);
}
.mega-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 12px; }
.mega-list a {
  display: block;
  font-size: 15px;
  font-weight: var(--fw-medium);
  color: var(--color-fg);
  text-decoration: none;
  padding: 4px 0;
  transition: color var(--t-fast), padding-left 0.2s ease;
  letter-spacing: 0.2px;
}
.mega-list a:hover {
  color: var(--color-accent);
  padding-left: 6px;
}

/* 移动端隐藏 mega（只 desktop 显示） */
@media (max-width: 960px) {
  .nav-desktop > .nav-item--mega { display: none; }
}

/* ---------- 汉堡菜单按钮 ---------- */
.menu-btn {
  display: none;
  width: 36px;
  height: 36px;
  border-radius: var(--r-md);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}
.menu-btn span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--color-fg);
  transition: transform var(--t-fast), opacity var(--t-fast);
}
.menu-btn span:nth-child(2) { width: 14px; }
.menu-btn.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.menu-btn.open span:nth-child(2) { opacity: 0; }
.menu-btn.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ---------- 移动端抽屉菜单 ---------- */
.mobile-drawer {
  position: fixed;
  inset: 0;                          /* V15: 全屏覆盖，不留 header */
  background: var(--color-bg);
  z-index: 95;
  padding: calc(var(--header-h) + var(--sp-4)) var(--sp-6) var(--sp-6);
  transform: translateY(-100%);       /* V15: 从顶部滑入，覆盖整屏 */
  transition: transform 0.45s cubic-bezier(0.32, 0.72, 0, 1);
  overflow-y: auto;
  padding-bottom: calc(var(--tabbar-h) + env(safe-area-inset-bottom, 0px) + 24px);
  visibility: hidden;
}
.mobile-drawer.open {
  transform: translateY(0);
  visibility: visible;
}
.mobile-drawer-nav { margin-bottom: var(--sp-8); }
.mobile-drawer a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;                    /* V15: 加大点击区 */
  font-size: 32px;                    /* V15: 全屏大字号 Apple 风 */
  color: var(--color-fg);
  border-bottom: 0.5px solid var(--color-border);
  font-weight: var(--fw-medium);
  letter-spacing: -0.5px;
  text-decoration: none;
}
.mobile-drawer a::after {
  content: '›';
  font-size: 32px;
  color: var(--color-fg-muted);
  font-weight: var(--fw-regular);
}
.mobile-drawer a.active { color: var(--color-accent); }
.mobile-drawer a.active::after { color: var(--color-accent); }
.mobile-drawer-meta {
  margin-top: var(--sp-6);
  padding: var(--sp-5);
  background: var(--color-bg-2);
  border-radius: var(--r-lg);
}
.mobile-drawer-meta-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 0;
  font-size: 15px;
}
.mobile-drawer-meta-row:not(:last-child) { border-bottom: 0.5px solid var(--color-border); }
.mobile-drawer-meta-row svg {
  width: 22px; height: 22px;
  color: var(--color-accent);
  flex-shrink: 0;
}
.mobile-drawer-cta {
  margin-top: var(--sp-6);
  padding: 18px;
  background: var(--color-accent);
  color: #fff;
  border-radius: var(--r-lg);
  text-align: center;
  font-size: 17px;
  font-weight: var(--fw-medium);
  text-decoration: none;
  display: block;
}

/* V59: 移动端 drawer 二维码区 */
.mobile-drawer-qrcode {
  display: flex;
  gap: 14px;
  margin-top: var(--sp-5);
}
.mobile-drawer-qr-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 14px 8px;
  background: var(--color-bg-2);
  border: 0.5px solid var(--color-border);
  border-radius: var(--r-lg);
  text-decoration: none;
  color: var(--color-fg);
  text-align: center;
  transition: border-color 200ms, background 200ms;
}
.mobile-drawer-qr-item:hover,
.mobile-drawer-qr-item:focus-visible {
  border-color: var(--color-accent);
  background: rgba(230, 0, 18, 0.08);
  outline: none;
}
.mobile-drawer-qr-item img {
  width: 110px;
  height: 110px;
  border-radius: 4px;
  background: #fff;
  padding: 4px;
  display: block;
}
.mobile-drawer-qr-item span {
  font-size: 12px;
  line-height: 1.4;
  color: var(--color-fg-muted);
}
.mobile-drawer-qr-item:hover span { color: var(--color-fg); }

/* ---------- 移动端 drawer 手风琴（V51） ---------- */
.drawer-accordion {
  border-bottom: 0.5px solid var(--color-border);
}
.drawer-accordion-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: none;
  border: 0;
  padding: 20px 0;
  font-size: 32px;
  color: var(--color-fg);
  font-weight: var(--fw-medium);
  letter-spacing: -0.5px;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
}
.drawer-accordion-trigger[aria-expanded="true"] {
  color: var(--color-accent);
}
.drawer-chevron {
  width: 22px; height: 22px;
  transition: transform var(--t-fast);
  flex-shrink: 0;
}
.drawer-accordion-trigger[aria-expanded="true"] .drawer-chevron {
  transform: rotate(180deg);
}

.drawer-accordion-panel {
  display: none;
  padding: 4px 0 18px;
}
.drawer-accordion-panel.is-open { display: block; }

.drawer-accordion-group {
  margin: 0 0 22px;
}
.drawer-accordion-group:last-child { margin-bottom: 8px; }
.drawer-accordion-group h6 {
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--color-fg-dim);
  text-transform: uppercase;
  margin: 0 0 10px;
  font-weight: var(--fw-medium);
}
.drawer-accordion-group a {
  display: block;
  padding: 12px 0;
  font-size: 22px;
  color: var(--color-fg);
  text-decoration: none;
  border-bottom: 0.5px solid var(--color-border);
  font-weight: var(--fw-regular);
  letter-spacing: -0.3px;
  transition: color var(--t-fast);
}
.drawer-accordion-group a:hover,
.drawer-accordion-group a:active {
  color: var(--color-accent);
}

/* ---------- 移动端底部 Tab ---------- */
.mobile-tabbar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 80;
  height: calc(var(--tabbar-h) + env(safe-area-inset-bottom, 0px));
  padding-bottom: env(safe-area-inset-bottom, 0px);
  background: rgba(10, 12, 15, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 0.5px solid var(--color-border);
}
.mobile-tabbar-inner {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  height: var(--tabbar-h);
}
.mobile-tab-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  color: var(--color-fg-muted);
  font-size: 10px;
  transition: color var(--t-fast);
}
.mobile-tab-item.active,
.mobile-tab-item:active { color: var(--color-accent); }
.mobile-tab-item svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--r-md);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all var(--t-fast);
  white-space: nowrap;
  text-decoration: none;
  min-height: 44px;
}
.btn-primary {
  background: var(--color-accent);
  color: white;
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent;
  color: var(--color-fg);
  border: 0.5px solid var(--color-border-strong);
}
.btn-ghost:hover {
  border-color: var(--color-fg);
  background: rgba(255, 255, 255, 0.04);
}
.btn-sm { padding: 8px 16px; font-size: var(--fs-xs); min-height: 36px; }
.btn-lg { padding: 16px 32px; font-size: var(--fs-md); min-height: 52px; }

/* ---------- 区块 ---------- */
.section {
  padding: var(--sp-20) 0;
}
.section-tight { padding: var(--sp-12) 0; }
.section-head {
  margin-bottom: var(--sp-12);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--sp-6);
  flex-wrap: wrap;
}
.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  color: var(--color-accent);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: var(--sp-4);
}
.section-eyebrow::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--color-accent);
}
.section-title {
  font-size: var(--fs-3xl);
  font-weight: var(--fw-semibold);
  line-height: 1.25;
  letter-spacing: -0.5px;
  color: var(--color-fg);
}
.section-title em {
  color: var(--color-accent);
  font-style: normal;
}
.section-subtitle {
  font-size: var(--fs-md);
  color: var(--color-fg-muted);
  line-height: 1.7;
  margin-top: var(--sp-4);
  max-width: 600px;
}
.section-link {
  font-size: var(--fs-sm);
  color: var(--color-fg-muted);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color var(--t-fast);
}
.section-link:hover { color: var(--color-accent); }

/* ---------- 卡片 ---------- */
.card {
  background: var(--color-bg-card);
  border: 0.5px solid var(--color-border);
  border-radius: var(--r-lg);
  padding: var(--sp-6);
  transition: all var(--t-base);
}
.card:hover {
  border-color: var(--color-border-strong);
  background: var(--color-bg-card-2);
  transform: translateY(-2px);
}

/* ---------- Footer ---------- */
.footer {
  background: #08090C;
  border-top: 0.5px solid var(--color-border);
  padding: var(--sp-16) 0 var(--sp-8);
  margin-top: var(--sp-20);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1fr 1.2fr;
  gap: var(--sp-10);
  margin-bottom: var(--sp-12);
}
.footer-col h4 {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-fg);
  margin-bottom: var(--sp-4);
}
.footer-col a,
.footer-col p {
  display: block;
  font-size: var(--fs-sm);
  color: var(--color-fg-muted);
  line-height: 1.9;
}
.footer-col a:hover { color: var(--color-fg); }
.footer-brand-block { font-size: var(--fs-sm); color: var(--color-fg-muted); line-height: 1.8; }
.footer-brand-block .brand-name strong { font-size: var(--fs-lg); }
.footer-brand-block .brand-mark { width: 56px; height: 56px; }   /* V29: 徽章 logo footer 56×56 */
.footer-qr {
  margin-top: var(--sp-4);
  display: flex;
  gap: var(--sp-4);
  align-items: center;
}
.footer-qr img {
  width: 64px;
  height: 64px;
  background: white;
  padding: 4px;
  border-radius: var(--r-sm);
}
.footer-qr-text { font-size: var(--fs-xs); color: var(--color-fg-muted); line-height: 1.6; }
.footer-bottom {
  padding-top: var(--sp-6);
  border-top: 0.5px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  font-size: var(--fs-xs);
  color: var(--color-fg-dim);
  flex-wrap: wrap;
  gap: var(--sp-3);
}

/* ---------- 通用工具 ---------- */
.text-center { text-align: center; }
.text-muted { color: var(--color-fg-muted); }
.text-accent { color: var(--color-accent); }
.divider {
  height: 0.5px;
  background: var(--color-border);
  margin: var(--sp-12) 0;
}
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ---------- 响应式断点 ---------- */
@media (max-width: 960px) {
  .nav-desktop,
  .header-cta { display: none; }
  .menu-btn { display: flex; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--sp-8); }
  .section { padding: var(--sp-12) 0; }
  .section-title { font-size: var(--fs-2xl); }
}

@media (max-width: 640px) {
  .container,
  .header-inner { padding: 0 var(--sp-4); }
  .mobile-tabbar { display: block; }
  body { padding-bottom: calc(var(--tabbar-h) + env(safe-area-inset-bottom, 0px)); }
  .section { padding: var(--sp-10) 0; }
  .section-head { margin-bottom: var(--sp-8); }
  .section-title { font-size: var(--fs-xl); }
  .section-subtitle { font-size: var(--fs-base); }
  .footer-grid { grid-template-columns: 1fr; gap: var(--sp-6); }
  .footer { padding: var(--sp-10) 0 var(--sp-6); margin-top: var(--sp-12); }
  .brand-name small { display: none; }
}