/* ─── 设计令牌 ─────────────────────────────────────── */
:root {
  --paper: #f5f4f0;
  --paper-strong: #ffffff;
  --ink: #17232b;
  --muted: #68737a;
  --line: rgba(23, 35, 43, 0.16);
  --blue: #355a70;
  --blue-dark: #243f50;
  --blue-soft: #dce6e9;
  --brass: #a77c3d;
  --brass-soft: #e8dcc7;
  --shadow: 0 24px 70px rgba(27, 42, 52, 0.12);
  --radius: 4px;
  --max: 1240px;

  /* 字号比例（以 15px 为基准，约 1.2 模数） */
  --text-xs:   12px;
  --text-sm:   13px;
  --text-base: 15px;
  --text-md:   16px;
  --text-lg:   18px;

  /* 间距节奏（8px 倍数） */
  --sp-2:  16px;
  --sp-3:  24px;
  --sp-4:  32px;
  --sp-5:  40px;
  --sp-6:  56px;
}

/* ─── 全局基础 ──────────────────────────────────────── */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(53, 90, 112, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(53, 90, 112, 0.035) 1px, transparent 1px),
    var(--paper);
  background-size: 40px 40px;
  font-family:
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  font-size: var(--text-base);
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

button,
a {
  font: inherit;
}

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

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

/* ─── 顶部导航 ──────────────────────────────────────── */
.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  min-height: 72px;
  padding: 0 4vw;
  border-bottom: 1px solid var(--line);
  background: rgba(245, 244, 240, 0.92);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: var(--text-base);
  font-weight: 650;
  letter-spacing: 0.06em;
}

.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  color: white;
  background: var(--blue-dark);
  font-family: Georgia, serif;
  font-size: var(--text-md);
  letter-spacing: 0;
}

.site-nav {
  display: flex;
  justify-content: center;
  gap: clamp(18px, 3vw, 40px);
  color: var(--muted);
  font-size: var(--text-sm);
}

.site-nav a {
  position: relative;
  padding: 24px 0;
}

.site-nav a::after {
  position: absolute;
  bottom: 16px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--brass);
  content: "";
  transition: width 180ms ease;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  width: 100%;
}

.header-action,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid var(--blue-dark);
  background: var(--blue-dark);
  color: white;
  font-size: var(--text-sm);
  font-weight: 650;
  letter-spacing: 0.04em;
  transition:
    transform 180ms ease,
    background 180ms ease;
}

.header-action:hover,
.button:hover {
  transform: translateY(-2px);
  background: var(--blue);
}

.button.secondary {
  border-color: var(--line);
  background: transparent;
  color: var(--ink);
}

.nav-toggle {
  display: none;
}

/* ─── 通用区块外壳 ─────────────────────────────────── */
.section-shell {
  width: min(var(--max), calc(100% - 8vw));
  margin-inline: auto;
  padding-block: clamp(64px, 9vw, 120px);
}

/* ─── 通用区块标题组 ──────────────────────────────── */
.section-label {
  margin: 0 0 12px;
  color: var(--brass);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.section-title {
  max-width: 800px;
  margin: 0;
  font-family: "Songti SC", "STSong", Georgia, serif;
  font-size: clamp(22px, 2.8vw, 36px);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.section-intro {
  max-width: 720px;
  margin: var(--sp-2) 0 0;
  color: var(--muted);
  font-size: var(--text-base);
  line-height: 1.8;
}

/* ─── 首屏 ──────────────────────────────────────────── */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 1fr);
  min-height: calc(100svh - 72px);
  align-items: center;
  gap: clamp(40px, 6vw, 96px);
  padding-block: clamp(56px, 7vw, 96px);
}

.hero h1 {
  max-width: 680px;
  margin: 0 0 var(--sp-3);
  font-family: "Songti SC", "STSong", Georgia, serif;
  font-size: clamp(30px, 4.2vw, 52px);
  font-weight: 600;
  line-height: 1.22;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.hero-subtitle {
  max-width: 620px;
  margin: 0 0 var(--sp-2);
  color: var(--muted);
  font-size: clamp(14px, 1.2vw, 17px);
  line-height: 1.85;
}

.hero-instructor {
  max-width: 620px;
  margin: 0;
  color: var(--blue);
  font-size: var(--text-sm);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: var(--sp-5);
}

.hero-visual {
  position: relative;
  min-width: 0;
}

.hero-visual::before {
  position: absolute;
  z-index: -1;
  inset: -24px 22% 16% -26px;
  border: 1px solid var(--brass);
  content: "";
}

.hero-visual img {
  width: 100%;
  min-height: 420px;
  object-fit: cover;
  box-shadow: var(--shadow);
}

.visual-caption {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 14px 0 0;
  color: var(--muted);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-align: center;
}

.visual-caption span {
  padding: 8px 6px;
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

.visual-caption span:last-child {
  border-right: 0;
}

/* ─── Hero 贴图横向滚动带 ──────────────────────────────── */
/* 用 CSS 变量统一容器与图片高度，避免 % 高度在 flex 中解析失败 */
:root {
  --sticker-h: clamp(420px, 48vh, 480px);
}

.sticker-track-wrap {
  overflow: hidden;
  border-radius: 12px;
  box-shadow: var(--shadow);
  height: var(--sticker-h);
  /* 两侧柔光渐隐 */
  mask-image: linear-gradient(to right, transparent 0%, #000 8%, #000 92%, transparent 100%);
  -webkit-mask-image: linear-gradient(to right, transparent 0%, #000 8%, #000 92%, transparent 100%);
}

.sticker-track {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  width: max-content;
  animation: sticker-scroll 52s linear infinite;
}

.sticker-track:hover {
  animation-play-state: paused;
}

.sticker-track img {
  /* 直接使用与容器相同的高度变量，不依赖 % 解析 */
  height: var(--sticker-h);
  width: auto;
  display: block;
  flex-shrink: 0;
}

@keyframes sticker-scroll {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* 滚动带模式下隐藏金色装饰边框 */
.hero-visual.sticker-mode::before {
  display: none;
}

/* ─── 痛点区 ─────────────────────────────────────────── */
.pain {
  border-top: 1px solid var(--line);
}

.pain-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin: var(--sp-6) 0 0;
  border-top: 1px solid var(--line);
}

.pain-item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
  padding: 24px 24px 24px 0;
  border-bottom: 1px solid var(--line);
  font-size: var(--text-base);
  line-height: 1.7;
}

.pain-item:nth-child(odd) {
  border-right: 1px solid var(--line);
}

.pain-number {
  padding-top: 2px;
  color: var(--brass);
  font-family: Georgia, serif;
  font-size: var(--text-md);
}

/* ─── 推荐主题 ──────────────────────────────────────── */
.recommendations {
  width: 100%;
  padding-inline: max(4vw, calc((100vw - var(--max)) / 2));
  background: var(--blue-dark);
  color: white;
}

.recommendation-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  margin-top: var(--sp-5);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.recommendation-item {
  padding: 28px 28px 28px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.recommendation-item:nth-child(odd) {
  border-right: 1px solid rgba(255, 255, 255, 0.2);
}

.recommendation-item:nth-child(even) {
  padding-left: 28px;
}

.recommendation-item h3 {
  margin: 0 0 10px;
  font-family: "Songti SC", "STSong", Georgia, serif;
  font-size: clamp(17px, 1.6vw, 22px);
  font-weight: 500;
  line-height: 1.4;
}

.recommendation-item p {
  margin: 0;
  color: rgba(255, 255, 255, 0.68);
  font-size: var(--text-base);
  line-height: 1.7;
}

/* ─── 课程全景目录 ──────────────────────────────────── */
.catalog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: var(--sp-5);
}

.catalog-card {
  padding: 20px 22px 22px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.07);
  border-top: 3px solid rgba(255, 255, 255, 0.2);
}

.catalog-card--blue  { border-top-color: #6aafd6; }
.catalog-card--brass { border-top-color: var(--brass); }
.catalog-card--muted { border-top-color: rgba(255, 255, 255, 0.35); }

.catalog-category {
  display: inline-block;
  margin: 0 0 14px;
  padding: 4px 12px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.15);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.9);
}

.catalog-card--blue  .catalog-category { background: #4a85aa; color: #fff; }
.catalog-card--brass .catalog-category { background: var(--brass); color: #fff; }

.catalog-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.catalog-list li {
  font-size: var(--text-sm);
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.82);
  padding-left: 14px;
  position: relative;
}

.catalog-list li::before {
  content: "·";
  position: absolute;
  left: 0;
  color: rgba(255, 255, 255, 0.4);
}

/* ─── 课程详情子标题 ─────────────────────────────────── */
.courses-sublabel {
  margin: 0 0 var(--sp-4);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--muted);
  text-transform: uppercase;
}

/* ─── 课程模块 ──────────────────────────────────────── */
.course-block {
  display: grid;
  grid-template-columns: minmax(220px, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(32px, 6vw, 80px);
  padding-block: clamp(48px, 6vw, 80px);
  border-bottom: 1px solid var(--line);
}

.course-block:first-child {
  border-top: 1px solid var(--line);
}

.course-index {
  color: var(--brass);
  font-family: Georgia, serif;
  font-size: var(--text-md);
}

.course-block h3 {
  margin: 14px 0 14px;
  font-family: "Songti SC", "STSong", Georgia, serif;
  font-size: clamp(18px, 1.8vw, 26px);
  font-weight: 600;
  line-height: 1.35;
}

.course-block p {
  margin: 0;
  color: var(--muted);
  font-size: var(--text-base);
  line-height: 1.75;
}

.course-details {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.detail-group {
  padding-top: 16px;
  border-top: 2px solid var(--blue);
}

.detail-group h4 {
  margin: 0 0 14px;
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
}

.clean-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.clean-list li {
  position: relative;
  padding-left: 16px;
  color: var(--muted);
  font-size: var(--text-base);
  line-height: 1.65;
}

.clean-list li::before {
  position: absolute;
  top: 0.7em;
  left: 0;
  width: 4px;
  height: 4px;
  background: var(--brass);
  content: "";
}

/* ─── 交付方式 ──────────────────────────────────────── */
.delivery-grid {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: clamp(32px, 6vw, 80px);
  margin-top: var(--sp-6);
}

.delivery-steps {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.delivery-step {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  font-size: var(--text-base);
  line-height: 1.7;
}

.delivery-step span {
  padding-top: 2px;
  color: var(--brass);
  font-family: Georgia, serif;
}

.delivery-table {
  border-top: 2px solid var(--blue);
}

.delivery-row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}

.delivery-row strong {
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.delivery-row span {
  color: var(--muted);
  font-size: var(--text-base);
  line-height: 1.65;
}

/* ─── 合作方案 ──────────────────────────────────────── */
.cooperation {
  width: 100%;
  padding-inline: max(4vw, calc((100vw - var(--max)) / 2));
  background: #e9eceb;
}

.plan-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: var(--sp-6);
  background: var(--line);
  border: 1px solid var(--line);
}

.plan {
  display: flex;
  min-height: 460px;
  flex-direction: column;
  padding: clamp(24px, 2.5vw, 36px);
  background: var(--paper-strong);
}

.plan:nth-child(2) {
  box-shadow: inset 0 4px 0 var(--brass);
}

.plan-level {
  margin: 0 0 14px;
  color: var(--brass);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
}

.plan h3 {
  margin: 0 0 16px;
  font-family: "Songti SC", "STSong", Georgia, serif;
  font-size: clamp(17px, 1.5vw, 22px);
  font-weight: 600;
  line-height: 1.35;
}

.plan-price {
  margin: -8px 0 16px;
  color: var(--brass);
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.plan-description {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: var(--text-base);
  line-height: 1.7;
}

.plan .clean-list {
  margin-bottom: var(--sp-4);
}

.plan .button {
  width: 100%;
  margin-top: auto;
}

.upgrade-note {
  margin-top: var(--sp-3);
  color: var(--muted);
  font-size: var(--text-sm);
  line-height: 1.7;
}

/* ─── 讲师介绍 ──────────────────────────────────────── */
.instructor {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: clamp(40px, 6vw, 96px);
  align-items: start;
}

.instructor-copy p {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: var(--text-base);
  line-height: 1.8;
}

.credential-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  margin: var(--sp-5) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.credential-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 14px 14px 0;
  border-bottom: 1px solid var(--line);
  color: var(--blue-dark);
  font-size: var(--text-sm);
  line-height: 1.55;
}

.credential-logo {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 4px;
  object-fit: contain;
  background: var(--paper);
}

.credential-star {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  color: var(--brass);
  font-size: 14px;
  line-height: 1;
}

.credential-list li:nth-child(odd) {
  border-right: 1px solid var(--line);
}

.credential-list li:nth-child(even) {
  padding-left: 14px;
}

.poster-frame {
  margin: 0;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  overflow: hidden;
  align-self: start;
}

.poster-frame img {
  display: block;
  width: 100%;
  height: auto;
}

/* ─── 思想与洞察 ─────────────────────────────────────── */
.insight-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: var(--sp-6);
  background: var(--line);
  border: 1px solid var(--line);
}

.insight-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(20px, 2.2vw, 32px);
  background: var(--paper-strong);
  transition: background 180ms ease;
}

.insight-card:hover {
  background: var(--blue-soft);
}

.insight-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.insight-tag {
  padding: 3px 9px;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
}

.insight-tag--blue   { background: var(--blue-soft); color: var(--blue-dark); }
.insight-tag--brass  { background: var(--brass-soft); color: var(--brass); }
.insight-tag--muted  { background: var(--line); color: var(--muted); }

.insight-date {
  color: var(--muted);
  font-size: var(--text-xs);
  white-space: nowrap;
}

.insight-card h3 {
  margin: 0;
  font-family: "Songti SC", "STSong", Georgia, serif;
  font-size: clamp(15px, 1.3vw, 18px);
  font-weight: 600;
  line-height: 1.45;
}

.insight-card p {
  margin: 0;
  color: var(--muted);
  font-size: var(--text-sm);
  line-height: 1.7;
  flex: 1;
}

.insight-read {
  margin-top: auto;
  color: var(--blue);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
}

.insight-follow {
  margin-top: var(--sp-4);
  color: var(--muted);
  font-size: var(--text-sm);
  text-align: center;
}

/* ─── 联系区块 ──────────────────────────────────────── */
.contact {
  width: 100%;
  padding-inline: max(4vw, calc((100vw - var(--max)) / 2));
  background: var(--blue-dark);
  color: white;
}

.contact-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(40px, 8vw, 100px);
  align-items: start;
}

.contact .section-title {
  color: white;
}

.contact p {
  max-width: 640px;
  color: rgba(255, 255, 255, 0.68);
  font-size: var(--text-base);
  line-height: 1.8;
}

.contact-links {
  display: grid;
  gap: 0;
  margin-top: var(--sp-4);
}

.contact-links a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.contact-links span:first-child {
  color: rgba(255, 255, 255, 0.5);
  font-size: var(--text-sm);
}

.contact-links strong {
  font-size: var(--text-base);
}

.qr-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.qr-card {
  padding: 12px;
  background: white;
  color: var(--ink);
}

.qr-card img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
}

.qr-card:first-child img {
  object-position: center 38%;
}

.qr-card span {
  display: block;
  padding: 8px 4px 2px;
  font-size: var(--text-xs);
  text-align: center;
  color: var(--muted);
}

/* ─── 页脚 ───────────────────────────────────────────── */
.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 4vw;
  border-top: 1px solid var(--line);
  background: var(--paper);
  color: var(--muted);
  font-size: var(--text-xs);
}

/* ─── 关键词高亮 ──────────────────────────────────────── */
.kw {
  color: var(--brass);
  font-weight: 700;
}

/* ─── 交付方式：格式名称与描述分行 ─────────────────────── */
.delivery-format-name {
  display: block;
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 4px;
}

.delivery-format-desc {
  margin: 0;
  color: var(--muted);
  font-size: var(--text-sm);
  line-height: 1.65;
}

/* ─── 讲师介绍附加样式 ───────────────────────────────── */
.instructor-research {
  margin: 0 0 var(--sp-3);
  color: var(--muted);
  font-size: var(--text-base);
  line-height: 1.8;
  padding-left: 14px;
  border-left: 3px solid var(--brass);
}

.credentials-label {
  margin: var(--sp-5) 0 0;
  padding: 0;
  color: var(--ink);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
}

/* ─── 动画 ───────────────────────────────────────────── */
[data-reveal] {
  transition:
    opacity 650ms ease,
    transform 650ms ease;
}

/* ─── 响应式：中屏 (≤ 980px) ─────────────────────────── */
@media (max-width: 980px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .nav-toggle {
    display: grid;
    width: 44px;
    height: 44px;
    place-content: center;
    gap: 7px;
    border: 0;
    background: transparent;
  }

  .nav-toggle span {
    width: 24px;
    height: 1px;
    background: var(--ink);
  }

  .site-nav {
    position: absolute;
    top: 72px;
    right: 0;
    left: 0;
    display: none;
    flex-direction: column;
    gap: 0;
    padding: 8px 4vw 20px;
    border-bottom: 1px solid var(--line);
    background: var(--paper);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 12px 0;
  }

  .header-action {
    display: none;
  }

  .hero,
  .course-block,
  .delivery-grid,
  .instructor,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero-visual {
    margin-top: 16px;
  }

  .plan-list {
    grid-template-columns: 1fr;
  }

  .plan {
    min-height: auto;
  }

  .insight-grid {
    grid-template-columns: 1fr;
  }

  .catalog-grid {
    grid-template-columns: 1fr;
  }
}

/* ─── 响应式：小屏 (≤ 680px) ─────────────────────────── */
@media (max-width: 680px) {
  .site-header {
    min-height: 64px;
  }

  .brand-text {
    font-size: 14px;
  }

  .brand-mark {
    width: 32px;
    height: 32px;
  }

  .site-nav {
    top: 64px;
  }

  .section-shell {
    width: calc(100% - 32px);
    padding-block: 56px;
  }

  .hero {
    padding-top: 40px;
  }

  .hero h1 {
    font-size: 30px;
    overflow-wrap: anywhere;
    word-break: break-all;
  }

  .hero-actions {
    display: grid;
  }

  .hero-visual img {
    min-height: 260px;
  }

  :root {
    --sticker-h: clamp(240px, 38vw, 320px);
  }

  .pain-list,
  .recommendation-list,
  .course-details,
  .credential-list,
  .qr-grid {
    grid-template-columns: 1fr;
  }

  .catalog-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pain-item:nth-child(odd),
  .recommendation-item:nth-child(odd),
  .credential-list li:nth-child(odd) {
    border-right: 0;
  }

  .recommendation-item:nth-child(even),
  .credential-list li:nth-child(even) {
    padding-left: 0;
  }

  .delivery-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .site-footer {
    flex-direction: column;
  }
}

/* ─── 减少动效（无障碍） ──────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}