/* =====================================================================
 *  v49 · "碳"索未来 —— 解锁绿色能源超能力
 *  共用样式表
 *  适配：max-1920 / 1280 / 1024 / 768 / 400 / 0
 * ===================================================================== */

/* ==================== 0. CSS 变量 ==================== */
:root {
  /* 主色：绿能 */
  --c-primary: #0c7f72;
  --c-primary-light: #479f83;
  --c-primary-dark: #007679;
  --c-accent: #137448;
  --c-bg-page: #bbdbc7;
  --c-bg-card: #ffffff;
  --c-more: #137448;

  /* 导航 */
  --bg-nav: #479f83;
  --bg-nav-active: #007679;
  --c-nav-text: #ffffff;

  /* 文本色 */
  --c-text: #254e49;
  --c-text-2: #676767;
  --c-text-3: #8c8c8c;
  --c-text-4: #677472;
  --c-light: #ffffff;

  --c-border: rgba(37, 78, 73, 0.10);
  --c-shadow: 0 8px 30px rgba(12, 127, 114, 0.14);
  --c-shadow-hover: 0 14px 40px rgba(12, 127, 114, 0.22);

  /* 字号（桌面默认） */
  --fs-hero: 26px;
  --fs-nav: 40px;
  --fs-foot: 15px;

  --fs-s1t: 32px;
  --fs-s1p: 24px;
  --fs-s1m: 24px;

  --fs-s2t: 57px;
  --fs-s2p: 24px;
  --fs-s2b: 30px;

  --fs-s3p: 30px;
  --fs-s3m: 28px;

  --fs-s4t: 30px;
  --fs-s4p: 23px;
  --fs-s4m: 28px;

  --fs-s4-tag: 29px;
  --fs-s4-btn: 30px;
  --fs-s4-ct: 46px;
  --fs-s4-cp: 30px;
  --fs-s4-cm: 24px;

  --fs-s5t: 48px;
  --fs-s5p: 29px;
  --fs-s5m: 28px;

  /* 桌面：只显示段落（34px）；标题/日期为小屏值 */
  --fs-list-t: 20px;
  --fs-list-p: 33px;
  --fs-list-d: 24px;
  --fs-list-b: 24px;

  --fs-detail-vt: 74px;
  --fs-detail-vp: 44px;
  --fs-detail-b: 30px;
  --fs-detail-H: 36px;
  --fs-detail-txt: 22px;

  /* 行高 */
  --lh-1: 1.2;
  --lh-15: 1.5;
  --lh-2: 2;

  /* 容器 */
  --index-w: 1720px;
  --list-w: 1800px;
  --detail-w: 1680px;
  --w-dot: 12px;

  /* 间距 */
  --gap-xl: 60px;
  --gap-lg: 30px;
  --gap-md: 24px;
  --gap-sm: 16px;
  --gap-xs: 8px;

  /* 圆角 */
  --r-card: 24px;
}

/* ==================== 1. Reset ==================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  width: 100%;
  min-height: 100%;
  background: var(--c-bg-page);
  color: var(--c-text);
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  overflow-x: hidden;
}

/* ==================== 1.1 滚动条 ==================== */
/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--c-primary) transparent;
}

/* WebKit (Chrome / Edge / Safari) */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background-color: var(--c-primary);
  border-radius: 6px;
  border: 2px solid transparent;
  background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
  background-color: var(--c-primary-dark);
  background-clip: padding-box;
}

::-webkit-scrollbar-corner {
  background: transparent;
}

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

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul,
ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
}

/* ==================== 2. 页头 ==================== */
.hero {
  position: relative;
  width: 100%;
  aspect-ratio: 1920 / 1200;
  overflow: hidden;
  background: #0a3056;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center top;
  background-repeat: no-repeat;
  z-index: 1;
}

.hero__inner {
  position: relative;
  z-index: 2;
  width: 100%;
  height: 100%;
  display: flex;
  line-height: 1.5;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding-top: 46.35%;
  font-size: var(--fs-hero);
  color: var(--c-text);
  text-shadow: 0 1px 2px rgba(255, 255, 255, 0.5);
}

.hero__logo {
  display: none;
}

/* ==================== 3. 导航 ==================== */
.nav {
  position: relative;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: stretch;
  gap: 0;
  z-index: 10;
  background: var(--bg-nav);
}

.nav__inner {
  width: 100%;
  aspect-ratio: 1920 / 120;
  display: flex;
  justify-content: stretch;
  align-items: stretch;
  position: relative;
  /* 白色发光边框 */
  border: 0px solid rgba(255, 255, 255, 0.5);
  border-left-width: 0;
  border-right-width: 0;
  box-shadow: 0 0 0.6vw rgba(255, 255, 255, 0.85),
              0 0 1.2vw rgba(255, 255, 255, 0.55),
              inset 0 0 0.9vw rgba(255, 255, 255, 0.35);
}

/* 导航内发光 */
.nav__inner::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  border-radius: inherit;
  box-shadow: inset 0 0 1.2vw 0.4vw rgba(255, 255, 255, 0.5),
              inset 0 0 0.4vw 1px rgba(255, 255, 255, 0.65);
  z-index: 2;
}

.nav__item {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  aspect-ratio: 243 / 120;
  max-height: 120px;
  background: var(--bg-nav);
  /* 文字仅用于无障碍，视觉标签由 nav-*.png 图形承担 */
  color: transparent;
  font-size: var(--fs-nav);
  font-weight: 700;
  letter-spacing: 2px;
  position: relative;
  transition: background 0.25s, transform 0.25s;
}
.nav__item:first-child {
  width: 12.65%;
  height: 100%;
}

.nav__item > img {
  position: absolute;
  z-index: 0;
  height: 54%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  object-fit: contain;
  opacity: 0.92;
  pointer-events: none;
  transition: opacity 0.25s, filter 0.25s;
}
.nav__item:first-child img {
  height: 48%;
}

.nav__item:hover > img {
  opacity: 1;
  filter: drop-shadow(0 0 6px rgba(79, 247, 217, 0.9));
}

.nav__item.is-active {
  background: var(--bg-nav-active);
}

/* 激活项内发光 */
.nav__item.is-active::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  box-shadow: inset 0 0 1vw 0.3vw rgba(255, 255, 255, 0.6),
              inset 0 0 0.3vw 1px rgba(255, 255, 255, 0.5);
  z-index: 2;
}

/* ==================== 4. 通用布局 ==================== */
.sec {
  width: 100%;
}

.sec__inner {
  position: relative;
  width: var(--index-w);
  max-width: var(--index-w);
  margin: 0 auto;
  container-type: inline-size;
}

.sec__list {
  position: relative;
  width: var(--inner-w);
  max-width: var(--inner-w);
  margin: 0 auto;
}

main {
  position: relative;
  width: 100%;
  overflow: hidden;
}

/* ==================== 5. Footer ==================== */
.footer {
  width: 100%;
  background: var(--c-primary-light);
  color: var(--c-light);
}

.footer__inner {
  width: var(--index-w);
  aspect-ratio: 1920 / 170;
  max-width: var(--index-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
  padding: 0 24px;
}

.footer__logo {
  width: 12%;
  filter: brightness(0) invert(1);
}

.footer__info {
  font-size: var(--fs-foot);
  line-height: 2.3;
  text-align: center;
  color: var(--c-light);
}

.footer__info p {
  margin: 0;
}

.footer__info img {
  display: inline-block;
  width: 1em;
  /*filter: brightness(0) invert(1);*/
}

.footer__info a {
  margin-right: 1em;
  color: var(--c-light);
}

.footer__icons {
  width: 12%;
  display: flex;
  gap: 20%;
}

.footer__icons img {
  height: 44px;
  width: auto;
}

/* ==================== 6. 栏目 1：绿能破译局（3卡可见轮播，5 positions） ==================== */
.sec-s1 {
  width: 100%;
  background-image: url(topic-carbon-future-v1-bg-s1-3.jpg);
  background-size: 100% 100%;
  background-repeat: no-repeat;
}
.sec__inner {
  width: var(--index-w);
  max-width: var(--index-w);
  margin: 0 auto;
}
.sec-s1 .sec__inner {
  aspect-ratio: 1720 / 1080;
  display: flex;
  flex-direction: column;
}

/* 标题 */
.s1-head {
  position: relative;
  width: 100%;
  aspect-ratio: 1720 / 235;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.s1-head__title {
  width: 28.95%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.s1-title-img {
  width: 100%;
  height: auto;
  object-fit: contain;
  transform: translateY(10%);
  transition: 0.3s;
  cursor: pointer;
}
.s1-title-img {
  /* 白色图形转为 #4a9ea0 */
  filter: brightness(0) saturate(100%) invert(56%) sepia(30%) saturate(757%) hue-rotate(129deg) brightness(94%) contrast(88%);
}
.s1-title-img:hover {
  filter: brightness(0) saturate(100%) invert(56%) sepia(30%) saturate(757%) hue-rotate(129deg) brightness(94%) contrast(88%) drop-shadow(0 0 0.6vw rgba(79, 247, 217, 0.9));
}

/* 3卡轮播 */
.s1 {
  position: relative;
  width: 100%;
  aspect-ratio: 1720 / 670;
  /*flex: 1;*/
  display: flex;
  align-items: stretch;
  justify-content: center;
}

.s1__viewport {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  container-type: inline-size;
}

/* 外层：只负责位置、显隐、过渡 */
.s1__card {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 33.3333%;
  aspect-ratio: 573 / 670;
  transition: transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1),
              opacity 0.5s ease;
  /* 默认隐藏，JS 按 data-pos 写入位移与透明度 */
  transform: translate(-50%, -50%) translate3d(var(--tx, 0), var(--ty, 0), 0) scale(var(--sc, 1));
  opacity: var(--op, 0);
  z-index: var(--zi, 0);
  pointer-events: var(--pe, none);
  display: flex;
  align-items: center;
  justify-content: center;
  --op: 0;
  --zi: 0;
}

/* 内层：只负责细节样式（边框、圆角、背景等） */
.s1__card__innner {
  position: relative;
  width: 95.1%;
  aspect-ratio: 545 / 670;
  background: var(--c-bg-card);
  border-radius: var(--r-card);
  border: 0px solid #fff;
  overflow: hidden;
  box-shadow: var(--c-shadow);
  display: flex;
  flex-direction: column;
}

.s1__card-img {
  width: 100%;
  aspect-ratio: 545 / 363;
  background-size: cover;
  background-position: center;
  flex-shrink: 0;
}

.s1__card-body {
  flex: 1;
  padding: 5% 6%;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  background: #fff;
}

.s1__card-title {
  font-size: var(--fs-s1t);
  font-weight: bold;
  color: var(--c-text);
  line-height: 1.3;
  margin-bottom: 0.8em;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.s1__card-desc {
  font-size: var(--fs-s1p);
  color: var(--c-text-2);
  line-height: 1.5;
  flex: 1;
  min-width: 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.4);
  margin-bottom: 1.0em;
}

/* 行数限制放在内层 */
.s1__card-desc-inner {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.s1__card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.s1__card-date {
  font-size: var(--fs-s1m);
  color: var(--c-text-3);
}

.s1__card-more {
  font-size: var(--fs-s1m);
  color: var(--c-text);
  font-weight: normal;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.s1__card-more::after {
  /*content: '\00bb';*/
  color: #254e49;
  border-color: #254e49;
  content: '';
  display: inline-block;
  margin-left: 0.4em;
  background-image: url(topic-carbon-future-v1-icon-more.png);
  background-size: 100% 100%;
  font-size: 0.8em;
  width: 1em;
  aspect-ratio: 1 / 1;
  /* 原 #0f2476 图形转为 #254e49 */
  filter: brightness(0) saturate(100%) invert(25%) sepia(22%) saturate(900%) hue-rotate(131deg) brightness(92%) contrast(88%);
}

/* 5 个位置（n=3 + 前后各 1 = 5） */
.s1__card[data-pos="0"] {
  /* 中间卡 */
  --tx: 0%;
  --ty: 0%;
  --sc: 1;
  --op: 1;
  --zi: 3;
  --pe: auto;
}

.s1__card[data-pos="-1"] {
  /* 左可见 */
  --tx: -100%;
  --ty: 0%;
  --sc: 1;
  --op: 1;
  --zi: 2;
  --pe: auto;
  justify-content: start;
}

.s1__card[data-pos="1"] {
  /* 右可见 */
  --tx: 100%;
  --ty: 0%;
  --sc: 1;
  --op: 1;
  --zi: 2;
  --pe: auto;
  justify-content: end;
}

.s1__card[data-pos="-2"] {
  /* 左侧溢出隐藏 */
  --tx: -200%;
  --ty: 0%;
  --sc: 1;
  --op: 0;
  --zi: 1;
  --pe: none;
}

.s1__card[data-pos="2"] {
  /* 右侧溢出隐藏 */
  --tx: 200%;
  --ty: 0%;
  --sc: 1;
  --op: 0;
  --zi: 1;
  --pe: none;
}

/* 左右切换按钮 */
.s1__arrow {
  position: absolute;
  top: 50%;
  left: 0%;
  transform: translateY(-50%);
  width: 3.4%;
  aspect-ratio: 1/1;
  min-width: 60px;
  border-radius: 50%;
  cursor: pointer;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: 0.3s;
  opacity: 0.01;
}

.s1__arrow img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: 0.3s;
}
.s1__arrow--prev img { transform: scaleX(-1); }
.s1__arrow--next { left: auto; right: 0%; }
.s1__arrow:hover { filter: drop-shadow(0 0 6px rgba(79, 247, 217, 0.9)); opacity: 0.25; transform: translateY(-50%) scale(1.02); }

/* 更多按钮 */
.s1-more {
  display: flex;
  justify-content: center;
  margin-top: 2.32%;
  
}

.s1-more__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 25%;
  aspect-ratio: 438 / 70;
  background: #fff;
  color: var(--c-text);
  border: 1px solid var(--c-primary);
  border-radius: 999px;
  font-size: var(--fs-s2b);
  font-weight: 500;
  letter-spacing: 1px;
  transition: background 0.25s, color 0.25s;
}

.s1-more__btn:hover {
  background: var(--c-primary);
  color: #fff;
}

/* ==================== 7. 栏目 2：减碳实践营（单卡轮播，3 positions） ==================== */
.sec-s2 {
  width: 100%;
  background-image: url(topic-carbon-future-v1-bg-s2-3m.jpg);
  background-size: 100% 100%;
  background-repeat: no-repeat;
}

.sec-s2 .sec__inner {
  aspect-ratio: 1720 / 1080;
  display: flex;
  flex-direction: column;
}

.s2-head {
  position: relative;
  width: 100%;
  aspect-ratio: 1720 / 220;
  display: flex;
  align-items: center;
  justify-content: center;
}


.s2 {
  position: relative;
  width: 100%;
  aspect-ratio: 1720 / 725;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: center;
}

.s2__viewport {
  position: relative;
  width: 100%;
  /* 桌面 1720*725 */
  height: 100%;
  margin: 0 auto;
  overflow: hidden;
  border-radius: var(--r-card);
  container-type: inline-size;
}

.s2__track {
  position: relative;
  width: 100%;
  height: 100%;
}

/* 外层：只负责位置、显隐、过渡 */
.s2__card {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  transform: translate3d(var(--tx, 0), 0, 0) scale(var(--sc, 1));
  transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.8s ease;
  opacity: var(--op, 0);
  z-index: var(--zi, 1);
  pointer-events: var(--pe, none);
}

/* 内层：只负责细节样式（背景、圆角、裁切） */
.s2__card__innner {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: var(--r-card);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: row-reverse;
  background-color: var(--c-bg-card);
  border-radius: var(--r-card);
  padding: 1.16%;
  box-sizing: border-box;
}

/* 背景图独立元素 */
.s2__card-img {
  position: relative;
  width: 70.83%;
  aspect-ratio: 1190 / 684;
  border-radius: var(--r-card);
  background-size: cover;
  background-position: center;
  z-index: 0;
}

.s2__card__innner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(12, 127, 114, 0.75) 0%, rgba(170, 202, 200, 0.5) 35%, rgba(0, 0, 0, 0) 60%);
  pointer-events: none;
  opacity: 0.01;
}

.s2__card-body {
  position: relative;
  z-index: 2;
  width: 29.17%;
  aspect-ratio: 490 / 684;
  
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding-left: 1.78%;
  padding-right: 1.78%;
  box-sizing: border-box;
  padding-top: 5.98%;
  padding-bottom: 5.3%;
}

.s2__card-title {
  font-size: var(--fs-s2t);
  font-weight: bold;
  color: var(--c-primary);
  margin-bottom: 0.4em;
  line-height: 1.2;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.s2__card-sub {
  font-size: var(--fs-s2p);
  color: var(--c-text-2);
  margin-bottom: 1em;
  line-height: 1.5;
  height: 35%;
  overflow: hidden;
}

.s2__card-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  align-self: flex-start;
  width: 62.79%;
  aspect-ratio: 270 / 60;
  text-align: center;
  background: #fff;
  border: 2px solid var(--c-primary);
  box-sizing: border-box;
  color: var(--c-primary);
  font-size: var(--fs-s2b);
  font-weight: 500;
  border-radius: 0.5em;
  letter-spacing: 0.1em;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  transition: background 0.25s, transform 0.25s;
}

.s2__card-btn:hover {
  background: var(--c-primary-light);
  color: #fff;
  transform: translateY(-2px);
}

.s2__card[data-pos="0"] {
  --tx: 0%;
  --sc: 1;
  --op: 1;
  --zi: 3;
  --pe: auto;
}

.s2__card[data-pos="-1"],
.s2__card[data-pos="1"] {
  --tx: 0%;
  --sc: 1;
  --op: 0;
  --zi: 1;
  --pe: none;
}

.s2__dots {
  position: absolute;
  width: 100%;
  aspect-ratio: 1720 / 80;
  left: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8vw;
  z-index: 25;
  transform: translateY(100%);
  user-select: none;
}

.s2__dot {
  
  height: var(--w-dot);
  aspect-ratio: 4 / 3;
  border-radius: calc(var(--w-dot) * 0.5);
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.7);
  cursor: pointer;
  transition: 0.3s;
  transform: scale(1.2);
}

.s2__dot.is-active {
  aspect-ratio: 4 / 2;
  background-color: #137448;
  
}

/* ==================== 8. 栏目 3：京城寻绿记（5张可见：中心1全+左右各2侧，7 positions） ==================== */
.sec-s3 {
  width: 100%;
  background-color: #d6ece0;
  background-image: url(topic-carbon-future-v1-bg-s3-3.jpg);
  background-size: 100% auto;
  background-position: center bottom;
  background-repeat: no-repeat;
}

.sec-s3 .sec__inner {
  aspect-ratio: 1720 / 1080;
  display: flex;
  flex-direction: column;
}

.s3-head {
  position: relative;
  width: 100%;
  aspect-ratio: 1920 / 220;
  display: flex;
  align-items: center;
  justify-content: center;
}

.s3-title-img {
  height: 65%;
  width: auto;
  object-fit: contain;
}

.s3 {
  position: relative;
  width: 100%;
  aspect-ratio: 1720 / 594;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: center;
  padding: 0;
}

.s3__viewport {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  container-type: inline-size;
}

.s3__track {
  position: relative;
  width: 100%;
  height: 100%;
  perspective: 1400px;
  perspective-origin: center;
}

/* 外层：只负责位置、显隐、过渡 */
.s3__card {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 46.51%;
  aspect-ratio: 800 / 594;
  transform: translate(-50%, -50%) translateX(var(--tx, 0)) rotateY(var(--ry, 0deg)) scale(var(--sc, 1));
  transition: transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1),
              opacity 0.5s ease;
  opacity: var(--op, 0);
  z-index: var(--zi, 0);
  
  box-sizing: border-box;
  pointer-events: var(--pe, none);
}

/* 内层：只负责细节样式（背景、圆角、阴影、裁切） */
.s3__card__innner {
  position: relative;
  width: 100%;
  height: 100%;
  border: 2px solid var(--c-bg-card);
  border-radius: calc(var(--r-card) * 0.6);
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(12, 127, 114, 0.18);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: end;
  color: #fff;
  box-sizing: border-box;
}

/* 背景图独立元素 */
.s3__card__img {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  z-index: 0;
}

.s3__card__innner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.6) 0%, rgba(0, 0, 0, 0) 60%);
  pointer-events: none;
}

.s3__card-title {
  position: relative;
  width: 100%;
  aspect-ratio: 796 / 90;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-text);
  background-color: var(--c-bg-card);
}

/* s3 卡片标题文本样式容器 */
.s3__card-title-inner {
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
  width: 100%;
  font-size: var(--fs-s3p);
  font-weight: bold;
  line-height: 1.4;
  text-align: center;
}

/* 7个位置 - 中心完全展示，左右各2张部分显示 */
.s3__card[data-pos="0"] {
  --tx: 0%;
  --ry: 0deg;
  --sc: 1;
  --op: 1;
  --zi: 5;
  --pe: auto;
}

.s3__card[data-pos="-1"] {
  --tx: -39%;
  --ry: 56deg;
  --sc: 0.75;
  --op: 0.85;
  --zi: 4;
  --pe: auto;
}

.s3__card[data-pos="1"] {
  --tx: 39%;
  --ry: -56deg;
  --sc: 0.75;
  --op: 0.85;
  --zi: 4;
  --pe: auto;
}

.s3__card[data-pos="-2"] {
  --tx: -71%;
  --ry: 70deg;
  --sc: 0.56;
  --op: 0.75;
  --zi: 3;
  --pe: none;
}

.s3__card[data-pos="2"] {
  --tx: 71%;
  --ry: -70deg;
  --sc: 0.56;
  --op: 0.75;
  --zi: 3;
  --pe: none;
}

.s3__card[data-pos="-3"] {
  /* 左外侧：定位在容器左侧，超出部分隐藏 */
  --tx: -100%;
  --ry: 68deg;
  --sc: 0.56;
  --op: 0;
  --zi: 2;
  --pe: none;
}

.s3__card[data-pos="3"] {
  /* 右外侧：定位在容器右侧，超出部分隐藏 */
  --tx: 180%;
  --ry: -68deg;
  --sc: 0.56;
  --op: 0;
  --zi: 2;
  --pe: none;
}

/* 箭头 */
.s3__arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 5.3%;
  aspect-ratio: 1/1;
  min-width: 30px;
  border-radius: 50%;
  cursor: pointer;
  z-index: 30;
  transition: 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.s3__arrow img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  opacity: 0.8;
}

.s3__arrow--prev {
  left: 0%;
  transform: translateY(-50%) scaleX(-1);
}

.s3__arrow--next {
  right: 0%;
}

.s3__arrow:hover {
  filter: drop-shadow(0 0 6px rgba(79, 247, 217, 0.9));
}

.s3-more {
  display: flex;
  justify-content: flex-end;
  width: 100%;
  aspect-ratio: 1720 / 80;
  font-size: var(--fs-s3m);
  color: var(--c-primary);
  font-weight: normal;
}

.s3-more a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.s3-more a::after {
  content: '\00bb';
  font-size: 1.25em;
}

/* ==================== 9. 栏目 4："碳"索圆桌派（单卡 + 右侧矩形资料卡） ==================== */
.sec-s4 {
  width: 100%;
  background-color: #bae2c8;
  background-image: url(topic-carbon-future-v1-bg-s4-3.jpg);
  background-size: 100% 100%;
  background-position: center bottom;
  background-repeat: no-repeat;
}
.sec-s4 .sec__inner {
  width: var(--index-w);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  padding: 0 0;
}

.s4-head {
  position: relative;
  width: 100%;
  aspect-ratio: 1720 / 180;
  display: flex;
  align-items: start;
  justify-content: center;
}

.s4-title-img {
  height: 65%;
  width: auto;
  object-fit: contain;
}

.s4 {
  position: relative;
  width: 100%;
  aspect-ratio: 1720 / 705;
  display: flex;
  align-items: stretch;
  justify-content: center;
  background-color: rgba(255, 255, 255, 0.5);
  border-radius: var(--r-card);
  padding-left: 1.16%;
  padding-right: 1.16%;
  padding-top: 1.74%;
  padding-bottom: 2.32%;
}

.s4__main {
  position: relative;
  width: 100%;
  height: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: row;
  gap: 1.5%;
  align-items: stretch;
}

.s4__left {
  position: relative;
  width: 63.69%;
  aspect-ratio: 1070 / 620;
  /*height: 100%;*/
  border-radius: var(--r-card);
  overflow: hidden;
  background-size: cover;
  background-position: center;
  background-color: #177c70;
  container-type: inline-size;
}

/* 外层：只负责位置、显隐、过渡 */
.s4__card {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  transform: translate3d(var(--tx, 0), var(--ty, 0), 0) scale(var(--sc, 1));
  transition: transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1), opacity 0.7s ease;
  opacity: var(--op, 0);
  z-index: var(--zi, 1);
  pointer-events: var(--pe, none);
}

/* 内层：只负责细节样式（背景、圆角、阴影、裁切） */
.s4__card__innner {
  position: relative;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: right center;
  border-radius: var(--r-card);
  overflow: hidden;
}

.s4__card__innner::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(to right, rgba(255, 255, 255, 0.45) 0%, rgba(255, 255, 255, 0.05) 100%);
  pointer-events: none;
}

.s4__card-body {
  position: absolute;
  inset: 0;
  z-index: 3;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 8% 4%;
  color: #fff;
  pointer-events: none;
  container-type: inline-size;
}

.s4__card-body > * {
  pointer-events: auto;
}

.s4__tag {
  
  width: 14.66%;
  aspect-ratio: 143 / 42;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #3b9a70;
  color: var(--c-light);
  font-size: var(--fs-s4-tag);
  font-weight: 500;
  border-radius: 0.4em;
  margin-bottom: 3cqw;
}

.s4__countdown {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  margin-bottom: 3cqw;
}

.s4__countdown-day {
  font-size: var(--fs-s4-ct);
  color: #224c3a;
  line-height: 1;
}

.s4__countdown-time {
  display: inline-flex;
  font-size: var(--fs-s4-cp);
  color: #224c3a;
  padding: 4px 12px;
  border-radius: 6px;
}
.s4__countdown-time:last-child {
  width: 100%;
  padding-left: 0;
}

.s4__card-title {
  font-size: calc(var(--fs-s4-cp) * 1.1);
  color: #224c3a;
  margin-bottom: 12px;
  line-height: 1.2;
}

.s4__card-desc {
  font-size: var(--fs-s4-cp);
  color: var(--c-text-2);
  line-height: 1.5;
  margin-bottom: 18px;
  min-width: 0;
}

/* 行数限制放在内层 */
.s4__card-desc-inner {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.s4__card-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  align-self: flex-start;
  width: 24.61%;
  aspect-ratio: 240 / 66;
  text-align: center;
  background: #0c7f72;
  color: #fff;
  font-size: var(--fs-s4-btn);
  border-radius: 0.5em;
  letter-spacing: 0.1em;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.25);
  transition: background 0.25s, transform 0.25s;
  margin-top: 3cqw;
}
.s4__card-btn::before {
  content: '';
  display: block;
  width: 1.2em;
  aspect-ratio: 1 / 1;
  background-image: url(topic-carbon-future-v1-icon-ber.png);
  background-size: 100% 100%;
  border-radius: 0.5em;
  margin-right: 0.4em;
  /* 黑色图标转为纯白 */
  filter: brightness(0) invert(1);
}

.s4__card-btn:hover {
  background: var(--c-primary-dark);
  transform: translateY(-2px);
}

.s4__card[data-pos="0"] {
  --tx: 0%;
  --ty: 0%;
  --sc: 1;
  --op: 1;
  --zi: 3;
  --pe: auto;
}

.s4__card[data-pos="-1"] {
  --tx: 0%;
  --ty: -100%;
  --sc: 1;
  --op: 1;
  --zi: 1;
  --pe: none;
}

.s4__card[data-pos="1"] {
  --tx: 0%;
  --ty: 100%;
  --sc: 1;
  --op: 1;
  --zi: 1;
  --pe: none;
}

/* 右侧矩形资料卡（DOTS） */
.s4__right {
  /*flex: 1;*/
  width: 35.71%;
  aspect-ratio: 600 / 620;
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: 1.5%;
  /*overflow: hidden;*/
  min-width: 0;
}

.s4__dots {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2.8%;
  min-height: 0;
  user-select: none;
  container-type: inline-size;
}

.s4__dot {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 5cqw;
  padding: 4% 6%;
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid rgba(12, 127, 114, 0.18);
  border-radius: calc(var(--r-card) * 0.9);
  cursor: pointer;
  transition: background 0.25s, transform 0.25s, border-color 0.25s;
  min-height: 0;
  overflow: hidden;
}

.s4__dot:hover {
  background: #fff;
  transform: translateX(-4px);
}

.s4__dot.is-active {
  background: #fff;
  border-color: var(--c-primary);
  box-shadow: 0 4px 14px rgba(12, 127, 114, 0.18);
}

.s4__dot-avatar {
  width: 26.33%;
  max-width: 158px;
  aspect-ratio: 1/1;
  border-radius: 50%;
  background-size: cover;
  background-position: center;
  background-color: #ddd;
}

.s4__dot-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4%;
  color: var(--c-text);
}

.s4__dot-name {
  font-size: var(--fs-s4t);
  font-weight: bold;
  color: var(--c-text);
  line-height: 1.2;
  margin-bottom: 0.2em;
}

.s4__dot-title {
  font-size: var(--fs-s4p);
  color: var(--c-text-2);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.s4__dot.is-active .s4__dot-name {
  color: var(--c-text);
}

.s4-more {
  display: flex;
  justify-content: flex-end;
  width: 100%;
  aspect-ratio: 1720 / 80;
  font-size: var(--fs-s3m);
  color: var(--c-primary);
  font-weight: normal;
  pointer-events: none;
  opacity: 0;
}

.s4-more a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.s4-more a::after {
  content: '\00bb';
  font-size: 1.25em;
}

/* ==================== 10. 栏目 5：侦碳60秒（2卡可见，4 positions） ==================== */
.sec-s5 {
  width: 100%;
  background-color: #91d0ad;
  background-image: url(topic-carbon-future-v1-bg-s5-3.jpg);
  background-size: 100% 100%;
  background-position: center bottom;
  background-repeat: no-repeat;
}
.sec-s5 .sec__inner {
  aspect-ratio: 1720 / 940;
  display: flex;
  flex-direction: column;
}

.s5-head {
  position: relative;
  width: 100%;
  aspect-ratio: 1720 / 260;
  display: flex;
  align-items: center;
  justify-content: center;
}

.s5-title-img {
  height: 60%;
  width: auto;
  object-fit: contain;
}

.s5 {
  position: relative;
  width: 100%;
  aspect-ratio: 1720 / 520;
  display: flex;
  align-items: center;
  justify-content: center;
}

.s5__viewport {
  position: relative;
  width: 100%;
  height: 100%;
  /*overflow: hidden;*/
  container-type: inline-size;
}

.s5__track {
  position: relative;
  width: 100%;
  height: 100%;
}

/* 外层：只负责位置、显隐、过渡 */
.s5__card {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 50%;
  aspect-ratio: 848 / 504;
  transform: translate(-50%, -50%) translateX(var(--tx, 0)) scale(var(--sc, 1));
  transition: transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1),
              opacity 0.5s ease;
  opacity: var(--op, 0);
  z-index: var(--zi, 0);
  pointer-events: var(--pe, none);
  display: flex;
  justify-content: start;
}

/* 内层：只负责细节样式（背景、圆角、阴影、裁切） */
.s5__card__innner {
  position: relative;
  width: 98.60%;
  height: 100%;
  background-size: cover;
  background-position: center;
  background-color: #1a5640;
  border-radius: var(--r-card);
  overflow: hidden;
  box-shadow: 0 0.8vw 1.0vw rgba(12, 141, 9, 0.42);
}

.s5__card__innner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7) 0%, rgba(0, 0, 0, 0.1) 50%, rgba(0, 0, 0, 0) 100%);
  pointer-events: none;
}

.s5__play {
  position: absolute;
  bottom: 0%;
  right: 0;
  transform: translate(-20%, -20%);
  width: 10.61%;
  aspect-ratio: 1/1;
  background: rgba(0, 0, 0, 0.3);
  border: 2px solid rgba(255, 255, 255, 0.85);
  border-radius: 50%;
  z-index: 5;
  cursor: pointer;
  transition: 0.4s;
  container-type: inline-size;
}

/* 白色等边三角形播放图标 */
.s5__play::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-35%, -50%);
  width: 0;
  height: 0;
  border-style: solid;
  /* 等边三角形：底边 2.4cqw，高 2.4×√3/2 ≈ 2.08cqw，上下各 1.04cqw */
  border-width: 30.0cqw 0 30.0cqw 51.0cqw;
  border-color: transparent transparent transparent #fff;
}

.s5__play:hover {
  background: rgba(0, 0, 0, 0.55);
  filter: drop-shadow(0 0 0.4vw rgba(140, 243, 224, 0.9));
}

.s5__card-body {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 4;
  padding: 4% 5%;
  color: #fff;
  pointer-events: none;
  padding-right: 10%;
}

.s5__card-body > * {
  pointer-events: auto;
}

.s5__card-title {
  font-size: var(--fs-s5t);
  font-weight: 700;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 8px;
}

.s5__card-desc {
  font-size: var(--fs-s5p);
  color: rgba(255, 255, 255, 0.92);
  line-height: 1.5;
  min-width: 0;
}
.s5__card-title,
.s5__card-desc-inner {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* 行数限制放在内层 */
.s5__card-desc-inner {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 4个位置（n=2 + 前后各 1 = 4） */
.s5__card[data-pos="0"] {
  --tx: -50%;
  --sc: 1;
  --op: 1;
  --zi: 3;
  --pe: auto;
}

.s5__card[data-pos="1"] {
  --tx: 50%;
  --sc: 1;
  --op: 1;
  --zi: 2;
  --pe: auto;
  justify-content: end;
}

.s5__card[data-pos="-1"] {
  --tx: -170%;
  --sc: 1;
  --op: 0;
  --zi: 1;
  --pe: none;
}

.s5__card[data-pos="2"] {
  --tx: 170%;
  --sc: 1;
  --op: 0;
  --zi: 1;
  --pe: none;
}

.s5__arrow {
  position: absolute;
  top: 50%;
  left: 0%;
  transform: translateY(-50%);
  width: 5.3%;
  aspect-ratio: 1/1;
  min-width: 28px;
  border-radius: 50%;
  cursor: pointer;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: 0.3s;
  opacity: 0.2;
}

.s5__arrow img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.s5__arrow--prev img { transform: scaleX(-1); }
.s5__arrow--next { left: auto; right: 0%; }
.s5__arrow:hover { filter: drop-shadow(0 0 6px rgba(79, 247, 217, 0.9)); opacity: 0.25; transform: translateY(-50%) scale(1.02); }

.s5-more {
  width: 100%;
  aspect-ratio: 1720 / 100;
  display: flex;
  justify-content: flex-end;
  font-size: var(--fs-s5m);
  color: var(--c-primary);
}

.s5-more a {
  display: inline-flex;
  align-items: center;
  gap: 0.2em;
}

.s5-more a::after {
  content: '\00bb';
  font-size: 1.25em;
}

/* ==================== 11. 列表页 ==================== */
.sec-list {
  background: var(--c-bg-page);
  background-image: url(topic-carbon-future-v1-bg-list.jpg);
  background-size: 100% auto;
  background-repeat: repeat-y;
  background-position: top center;
}

.sec-list::before, .sec-list::after {
  content: '';
  display: inline-block;
  width: var(--list-w);
  aspect-ratio: 1800 / 50;;
}

.list-wrap {
  position: relative;
  width: var(--list-w);
  max-width: var(--list-w);
  aspect-ratio: 1800 / 2040;
  margin: 0 auto;
  z-index: 1;
  padding: 2.77% 1.33%;
  box-sizing: border-box;
  border-radius: var(--r-card);
  background-color: rgba(255, 255, 255, 0.65);
  container-type: inline-size;
}
.list {
  width: 100%;
  height: 100%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  column-gap: 1.5cqw;
  row-gap: 3.0cqw;
  overflow-y: auto;
  overflow-x: hidden;
  padding-right: 1.67cqw;
  /* 行高按卡片实际高度计算，避免拉伸导致行高小于卡片而挤掉行距 */
  align-items: start;
  grid-auto-rows: max-content;
}

.list-card {
  width: 100%;
  aspect-ratio: 550 / 438;
  display: flex;
  flex-direction: column;
  background: var(--c-bg-card);
  border-radius: var(--r-card);
  box-shadow: var(--c-shadow);
  transition: transform 0.3s, box-shadow 0.3s;
  cursor: pointer;
  overflow: hidden;
  padding: 2.9% 2.9%;
  box-sizing: border-box;
  background-color: #479f83;
  
}

.list-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--c-shadow-hover);
}

/* 图片容器：负责尺寸/比例/边框 */
.list-card__media {
  width: 100%;
  aspect-ratio: 518 / 280;
  overflow: hidden;
  border-radius: var(--r-card);
  border: 2px solid var(--c-bg-card);
  box-sizing: border-box;
}

/* 图片元素：铺满容器并裁切 */
.list-card__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.list-card__body {
  width: 100%;
  aspect-ratio: 518 / 120;
  display: flex;
  flex-direction: column;
  min-height: 0;
  align-items: center;
  justify-content: center;
}

/* 桌面：标题隐藏（设计图仅显示段落） */
.list-card__title {
  display: none;
  font-size: var(--fs-list-t);
  font-weight: bold;
  color: #007679;
  line-height: 1.2;
  margin-top: 0.4em;
  margin-bottom: 0.4em;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 桌面：段落为主文案（外层仅布局） */
.list-card__desc {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  padding: 0 1cqw;
}

/* 段落文本样式容器 */
.list-card__desc-inner {
  width: 100%;
  font-size: var(--fs-list-p);
  color: var(--c-light);
  line-height: 1.2;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 桌面：日期/标注隐藏 */
.list-card__meta {
  display: none;
  align-items: center;
  justify-content: space-between;
  margin-top: 4px;
}

.list-card__date {
  font-size: var(--fs-list-d);
  color: #007679;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-weight: normal;
  /*border-top: 1px solid rgba(0, 118, 121, 0.2);*/
  width: 100%;
}

.list-card__date img {
  width: 1em;
  height: 1em;
  filter: brightness(0) saturate(100%) invert(36%) sepia(60%) saturate(750%) hue-rotate(151deg) brightness(94%) contrast(93%);
}

/* ==================== 12. 详情页 ==================== */
.sec-detail {
  background: var(--c-bg-page);
  background-image: url(topic-carbon-future-v1-bg-list.jpg);
  background-size: 100% auto;
  background-repeat: repeat-y;
  min-height: 600px;
  padding: 2% 0 6%;
  position: relative;
}

.sec__detail__inner {
  width: var(--detail-w);
  max-width: var(--detail-w);
  margin: 0 auto;
  container-type: inline-size;
  position: relative;
}

.detail-toolbar {
  max-width: var(--detail-w);
  margin: 0 auto 1px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.d-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-detail-b);
  color: var(--c-primary);
  font-weight: 700;
  padding: 8px 0;
  border-radius: 30px;
  transition: background 0.2s, opacity 0.25s;
}

.d-back img {
  width: 1.2em;
  height: 1.2em;
  /* 黑色图标转为 #0c7f72 */
  filter: brightness(0) saturate(100%) invert(39%) sepia(51%) saturate(680%) hue-rotate(121deg) brightness(92%) contrast(92%);
}

.d-back--top {
  margin: 0 0 20px 0;
}

.d-back--bottom {
  position: relative;
  display: none;
}

.d-back:hover { background: rgba(12, 127, 114, 0.10); }

/* 模式切换 */
.mode-switch {
  display: inline-flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(12, 127, 114, 0.25);
  border-radius: 999px;
  padding: 2px;
  box-shadow: var(--c-shadow);
}

.mode-switch__btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 1.5em;
  font-size: var(--fs-detail-vp);
  font-weight: 600;
  color: var(--c-text-2);
  border-radius: 999px;
  cursor: pointer;
  transition: all .25s ease;
  user-select: none;
}

.mode-switch__btn:hover {
  color: var(--c-primary);
}

.mode-switch__btn.is-active {
  background: linear-gradient(135deg, #479f83, #0c7f72);
  color: #fff;
  box-shadow: 0 6px 16px rgba(12, 127, 114, 0.32);
}

/* 详情盒 */
.detail-box {
  max-width: var(--detail-w);
  margin: 0 auto;
}

/* 视频模式 */
.detail-video {
  position: relative;
  width: 100%;
  max-width: var(--detail-w);
  aspect-ratio: 1680 / 945;
  margin: 0 auto;
  background: #000;
  border-radius: 0;
  /*overflow: hidden;*/
  box-shadow: var(--c-shadow);
}

.video__overlay_title {
  display: none;
  font-size: var(--fs-detail-vt);
}

.detail-video video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}

.detail-video__overlay {
  position: absolute;
  inset: 0;
  z-index: 3;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 4.7% 3.5%;
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.1) 0%, rgba(0, 0, 0, 0.1) 50%, rgba(0, 0, 0, 0.85) 100%);
  transition: opacity 0.3s ease;
}

.detail-video__overlay.is-hidden {
  opacity: 0;
  pointer-events: none;
}

.detail-video__title {
  font-size: var(--fs-detail-vt);
  font-weight: bold;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 14px;
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.5);
}

.detail-video__desc {
  font-size: var(--fs-detail-vp);
  color: rgba(255, 255, 255, 0.92);
  line-height: 1.5;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

.detail-video__play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 14.6%;
  aspect-ratio: 1/1;
  background-image:  url('topic-carbon-future-v1-icon-play-v.png');
  background-size: 100% 100%;
  border-radius: 50%;
  z-index: 4;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}

.detail-video__play:hover {
  transform: translate(-50%, -50%) scale(1.05);
  filter: drop-shadow(0 0 6px rgba(79, 247, 217, 0.9));;
}

.detail-video__play.is-hidden {
  opacity: 0;
  pointer-events: none;
}

/* 图文模式 */
.detail-card {
  background: #fff;
  border-radius: var(--r-card);
  padding: 4.76% 5.6%;
  box-shadow: var(--c-shadow);
  margin-bottom: 3cqw;
}

.detail-card__body {
  padding: 0 5%;
  max-width: 92%;
  margin: 0 auto;
}

.detail-card__title {
  font-size: var(--fs-detail-H);
  font-weight: 700;
  color: #000;
  text-align: center;
  margin-bottom: 12px;
  line-height: 1.3;
}

.detail-source {
  text-align: center;
  font-size: calc(var(--fs-detail-txt) * 0.8);
  color: #000;
  opacity: 0.7;
  margin-top: 18px;
  padding-bottom: 2%;
}

.detail-card__divider {
  width: 100%;
  height: 1px;
  background-color: rgba(0, 0, 0, .12);
  margin: 20px auto 30px;
}

.detail-card__body {
  font-size: var(--fs-detail-txt);
  color: #000;
  line-height: 1.8;
}

.detail-card__body p {
  margin-bottom: 18px;
  text-indent: 2em;
}

.detail-card__body img,
.detail-card__body video {
  display: block;
  max-width: 100%;
  margin: 30px auto;
  border-radius: 8px;
}

/* 模式切换控制变体显隐 */
body.detail-mode-v .detail-t { display: none; }
body.detail-mode-t .detail-v { display: none; }

/* ==================== 13. 响应式 ==================== */

/* max-1800：1200 缩小 0.7 */
@media (max-width: 1800px) {
  :root {
    --fs-hero: 18px;
    --fs-nav: 28px;
    --fs-foot: 11px;
    --fs-s1t: 22px;
    --fs-s1p: 16px;
    --fs-s1m: 16px;
    --fs-s2t: 38px;
    --fs-s2p: 18px;
    --fs-s2b: 20px;
    --fs-s3p: 21px;
    --fs-s3m: 20px;
    --fs-s4t: 21px;
    --fs-s4p: 16px;
    --fs-s4m: 19px;
    --fs-s4-tag: 20px;
    --fs-s4-btn: 20px;
    --fs-s4-ct: 32px;
    --fs-s4-cp: 21px;
    --fs-s4-cm: 16px;

    --fs-s5t: 32px;
    --fs-s5p: 20px;
    --fs-s5m: 19px;
    --fs-list-t: 22px;
    --fs-list-p: 24px;
    --fs-list-d: 12px;
    --fs-list-b: 16px;
    --fs-detail-vt: 50px;
    --fs-detail-vp: 30px;
    --fs-detail-b: 21px;
    --fs-detail-H: 24px;
    --fs-detail-txt: 15px;
    --index-w: 1200px;
    --list-w: 1200px;
    --detail-w: 1200px;
    --w-dot: 10px;
    --r-card: 16px;
    --gap-lg: 20px;
  }
}

/* max-1280：980 缩小 0.57 */
@media (max-width: 1280px) {
  :root {
    --fs-hero: 15px;
    --fs-nav: 23px;
    --fs-foot: 9px;
    --fs-s1t: 18px;
    --fs-s1p: 13px;
    --fs-s1m: 13px;
    --fs-s2t: 32px;
    --fs-s2p: 14px;
    --fs-s2b: 17px;
    --fs-s3p: 17px;
    --fs-s3m: 16px;
    --fs-s4t: 17px;
    --fs-s4p: 13px;
    --fs-s4m: 16px;

    --fs-s4-tag: 17px;
    --fs-s4-btn: 17px;
    --fs-s4-ct: 26px;
    --fs-s4-cp: 17px;
    --fs-s4-cm: 13px;

    --fs-s5t: 26px;
    --fs-s5p: 16px;
    --fs-s5m: 16px;
    --fs-list-t: 18px;
    --fs-list-p: 19px;
    --fs-list-d: 10px;
    --fs-list-b: 13px;
    --fs-detail-vt: 40px;
    --fs-detail-vp: 24px;
    --fs-detail-b: 16px;
    --fs-detail-H: 20px;
    --fs-detail-txt: 13px;
    --index-w: 980px;
    --list-w: 980px;
    --detail-w: 980px;
    --w-dot: 9px;
    --r-card: 13px;
    --gap-lg: 17px;
  }

  .footer__inner {
    width: 94.66%;
    max-width: 94.66%;
    gap: 1vw;
  }

  .footer__icons img {
    height: 4vw;
  }
}

/* max-1024：移动端 720 0.42 */
@media (max-width: 1024px) {
  :root {
    --fs-hero: 11px;
    --fs-nav: 17px;
    --fs-foot: 7px;
    --fs-s1t: 13px;
    --fs-s1p: 10px;
    --fs-s1m: 10px;
    --fs-s2t: 24px;
    --fs-s2p: 13px;
    --fs-s2b: 12px;
    --fs-s3p: 13px;
    --fs-s3m: 12px;
    --fs-s4t: 13px;
    --fs-s4p: 10px;
    --fs-s4m: 12px;
    --fs-s4-tag: 12px;
    --fs-s4-btn: 12px;
    --fs-s4-ct: 19px;
    --fs-s4-cp: 12px;
    --fs-s4-cm: 10px;
    --fs-s5t: 20px;
    --fs-s5p: 13px;
    --fs-s5m: 12px;

    --fs-list-t: 14px;
    --fs-list-p: 14px;
    --fs-list-d: 9px;
    --fs-list-b: 10px;
    --fs-detail-vt: 28px;
    --fs-detail-vp: 16px;
    --fs-detail-b: 13px;
    --fs-detail-H: 16px;
    --fs-detail-txt: 10px;
    --index-w: 720px;
    --list-w: 720px;
    --detail-w: 720px;
    --w-dot: 7px;
    --r-card: 8px;
    --gap-lg: 12px;
  }

  

  .footer__icons, .footer__logo {
    display: none;
  }
}

/* max-768：移动端单卡 */
@media (max-width: 768px) {
  :root {
    --fs-hero: 1.33vw;
    --fs-nav: 2.66vw;
    --fs-foot: 1.0vw;
    --fs-s1t: 3.2vw;
    --fs-s1p: 2.8vw;
    --fs-s1m: 2.66vw;
    --fs-s2t: 3.3vw;
    --fs-s2p: 2.9vw;
    --fs-s2b: 2.4vw;
    --fs-s3p: 3.2vw;
    --fs-s3m: 2.9vw;
    --fs-s4t: 2.9vw;
    --fs-s4p: 2.66vw;
    --fs-s4m: 2.9vw;
    --fs-s4-tag: 2.66vw;
    --fs-s4-btn: 2.9vw;
    --fs-s4-ct: 3.46vw;
    --fs-s4-cp: 2.4vw;
    --fs-s4-cm: 1.86vw;
    --fs-s5t: 3.2vw;
    --fs-s5p: 2.93vw;
    --fs-s5m: 2.93vw;

    --fs-list-t: 3.73vw;
    --fs-list-p: 3.2vw;
    --fs-list-d: 3.2vw;
    --fs-list-b: 3.2vw;

    --fs-detail-vt: 4.0vw;
    --fs-detail-vp: 2.4vw;
    --fs-detail-b: 3.4vw;
    --fs-detail-H: 3.6vw;
    --fs-detail-txt: 1.66vw;
    --index-w: 93.33%;
    --list-w: 93.33%;
    --detail-w: 93.33%;
    --w-dot: 6px;
    --r-card: 1.6vw;
    --gap-lg: 2.66vw;
  }

  .hero__inner {
    padding-top: 46%;
  }

  .nav__inner {
    width: 100%;
    aspect-ratio: 750 / 48;
  }
  .nav__item:first-child {
    width: 12.4%;
  }
  .nav__item:first-child img {
    height: 48%;
  }
  .nav__item {
    aspect-ratio: 131 / 48;
  }

  .s1-head {
    aspect-ratio: 700 / 106;
  }
  .sec-s1 {
    background-image: url(topic-carbon-future-v1-bg-s1-3m.jpg);
    background-size: 100% 100%;
  }
  .s1 {
    aspect-ratio: 700 / 285;
  }
  .sec-s1 .sec__inner {
    aspect-ratio: 700 / 480;
  }
  .s1__card {
    aspect-ratio: 233 / 285;
  }
  .s1__card-body {
    padding: 5% 5%;
    justify-content: space-between;
  }
  .s1__card-title {
    -webkit-line-clamp: 1;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-bottom: 0;
    line-height: 1.1;
  }
  .s1__card-desc-inner {
    -webkit-line-clamp: 1;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .s1__card-desc {
    margin-bottom: 0.0em;
    line-height: 1.1;
    flex: unset;
    padding-bottom: 0.4em;
  }
  .s1__card-date {
    display: none;
  }
  .s1__card-more {
    width: 100%;
    aspect-ratio: 201 / 30;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 1em;
    background-color: var(--c-bg-page);
  }
  .s1-more {
    margin-top: 5.6%;
  }

  .s2 {
    aspect-ratio: 700 / 300;
  }
  .s2__card-btn {
    width: 96%;
    aspect-ratio: 168 / 43;
    border-width: 1px;
  }
  .s2__dots {
    aspect-ratio: 700 / 50;
    gap: 2.33vw;
  }

  /* 移动端：s1 保持 3 卡可见（沿用桌面位置，仅缩字号） */

  /* s3 移动端：显示中心 + 左右各 1（共 3 张） */
  .s3__card[data-pos="1"] {
    --tx: 45%
  }
  .s3__card[data-pos="-1"] {
    --tx: -45%
  }
  .s3__card[data-pos="-2"],
  .s3__card[data-pos="2"] {
    --op: 0.5;
    --zi: 1;
    --pe: none;
  }
  .s3__card[data-pos="-3"],
  .s3__card[data-pos="3"] {
    --op: 0;
    --zi: 1;
    --pe: none;
  }
  .s3__arrow {
    width: 5.3vw;
    min-width: 24px;
  }

  /* s4 移动端：左右换行，主卡上，资料卡下方 */
  .s4 {
    aspect-ratio: 700 / 512;
    padding: 1.42% 1.42%;
  }
  .sec-s4 {
    background-image: url(topic-carbon-future-v1-bg-s4-3m.jpg);
  }
  .s4__main {
    flex-direction: column;
    gap: 2%;
    justify-content: space-around;
  }
  .s4-more {
    display: flex;
    aspect-ratio: 750 / 50;
    pointer-events: all;
    opacity: 1;
  }
  .s4__left {
    width: 100%;
    aspect-ratio: 680 / 393;
  }
  .s4__tag {
    width: 19.23%;
    aspect-ratio: 120 / 36;
  }
  .s4__card-btn {
    width: 24.67%;
    aspect-ratio: 154 / 43;
  }

  .s4__right {
    width: 100%;
    aspect-ratio: 680 / 78;
    height: auto;
  }

  .s4__dots {
    flex-direction: row;
    gap: 2%;
  }

  .s4__dot {
    width: 32.05%;
    aspect-ratio: 218 / 78;
    text-align: left;
    padding: 4% 2%;
    gap: 1cqw;
  }
  .s4__dot-info {
    overflow: hidden;
  }
  .s4__dot-name, .s4__dot-title {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .s4__dot-avatar {
    max-width: 50px;
  }

  /* s5 移动端保持 2 卡可见 */
  .s5 {
    aspect-ratio: 700 / 220;
  }
  .s5__card[data-pos="-1"] { --tx: -170%; --op: 0; }
  .s5__card[data-pos="2"]  { --tx: 170%;  --op: 0; }

  .s5__card[data-pos="0"] {
    --tx: -50%;
    --sc: 1;
    --op: 1;
    --zi: 3;
    --pe: auto;
  }

  .s5__card-body {
    padding-right: 15%;
  }
  .s5__card-title,
  .s5__card-desc-inner {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .s5__play {
    width: 14.28%;
  }
  .s5__card {
    aspect-ratio: 350 / 210;
  }

  /* 列表页：单列横向 */
  .list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .list-card {
    flex-direction: row;
    aspect-ratio: 700 / 176;
    background-color: rgba(255, 255, 255, 0.95);
    padding: 0.7% 0.7%;
  }

  .list-card__media {
    width: 38%;
    aspect-ratio: 263 / 168;
    border-bottom: none;
    border-right: 2px solid #e0e7f0;
    flex-shrink: 0;
  }

  .list-card__body {
    flex: 1;
    height: 100%;
    overflow: hidden;
    padding: 0 4.11%;
  }

  /* 小屏：显示 标题 + 段落 + 日期 */
  .list-card__title {
    width: 100%;
    display: -webkit-box;
    font-size: var(--fs-list-t);
  }

  .list-card__desc-inner {
    font-size: var(--fs-list-p);
    color: #676767;
  }

  .list-card__meta {
    width: 100%;
    display: flex;
  }

  /* 详情页 */
  .detail-card {
    padding: 5.71% 5%;
  }

  .d-back--top {
    display: none;
  }

  .d-back--bottom {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    margin-top: 4vw;
  }

  /* footer 隐藏 */
  .footer {
    display: none;
  }
  .list-wrap {
    aspect-ratio: auto;
    padding: 0;
    background-color: transparent;
  }
  .list {
    height: auto;
  }
  .list-card__desc {
    padding: 0;
  }
  .sec-detail {
    padding: 4% 6%;
  }

  .video__overlay_title {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    aspect-ratio: 700 / 80;
    transform: translateY(-100%);
    display: flex;
    align-items: center;
    justify-content: left;
    z-index: 9;
    pointer-events: none;
    padding-right: 20%;
  }
  .video__overlay_title .detail-video__title {
    color: var(--c-primary);
    text-shadow: none;
    margin-bottom: 0;
    pointer-events: all;
  }
  .video__overlay_title::before {
    content: '';
    display: block;
    height: 1em;
    aspect-ratio: 1/5;
    background-color: var(--c-primary);
    margin-right: 0.5em;
  }
   
   
}

/* max-400：超小屏 */


/* ==================== 14. 内容加载动画：右侧滑入渐入 ==================== */
.reveal {
  opacity: 0;
  transform: translateX(60px);
  transition: opacity 0.8s cubic-bezier(0.22, 0.61, 0.36, 1),
              transform 0.8s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateX(0);
}

[hidden]{display:none!important}
.trs-css-background-asset-preload{display:none!important}
.footer__copyright-mark::before{content:"\00a9 ";}
.trs-list-heading{text-align:center;color:#007679;margin:0 0 2rem;font-size:2rem}
.topic-pagination{display:flex;justify-content:center;gap:.75rem;padding:2rem 0}
.topic-pagination__link{min-width:2.25rem;height:2.25rem;display:grid;place-items:center;color:#007679;border:1px solid #007679;text-decoration:none}
.topic-pagination__link.is-active{background:#007679;color:#fff}
@media (max-width:768px){.video__overlay_title{right:48%;width:auto;padding-right:8px}.video__overlay_title .detail-video__title{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}}

/* Automatically selected media shares one article with its full body. */
.detail-card .detail-video{max-width:100%;margin:0 auto 24px;border-radius:8px;overflow:hidden}
.detail-card .detail-video video{object-fit:contain}
.detail-card__body iframe{display:block;max-width:100%;margin:24px auto;box-sizing:border-box}
.detail-source [data-detail-meta]+[data-detail-meta]{margin-left:1em}
/* Roundtable cover shows only its details action at the lower left. */
.s4__card-body{justify-content:flex-end}
.s4__card-btn{margin-top:0}
.s4__card-btn::before{display:none;content:none}
.s4__card__innner{display:block;text-decoration:none}
.s4__card__innner:focus-visible{outline:3px solid #fff;outline-offset:-4px}
/* Keep the original three-card slot size when only one/two records exist. */
.s4__dots{display:grid;grid-template-rows:repeat(3,minmax(0,1fr));align-content:start}
@media(max-width:768px){.s4__dots{grid-template-columns:repeat(3,minmax(0,1fr));grid-template-rows:1fr}.s4__dot{width:auto}}
/* Real records only: no cloned positions, autoplay, perspective or clipping. */
.sec-s1 .sec__inner,.sec-s3 .sec__inner,.sec-s5 .sec__inner{aspect-ratio:auto;padding-bottom:3%}
.topic-static{display:block;aspect-ratio:auto;height:auto;min-height:0}
.topic-static .s1__viewport,.topic-static .s3__viewport,.topic-static .s5__viewport{height:auto;overflow:visible}
.topic-static .s1__track,.topic-static .s3__track,.topic-static .s5__track{display:flex;flex-wrap:wrap;justify-content:center;align-items:stretch;gap:20px 2.4%;height:auto;perspective:none;transform:none}
.topic-static .s1__card,.topic-static .s3__card,.topic-static .s5__card{position:static;inset:auto;transform:none;transition:none;opacity:1;pointer-events:auto;z-index:auto;flex:none}
.topic-static .s1__card{width:31.73%;aspect-ratio:auto}
.topic-static .s1__card__innner{width:100%;height:100%}
.topic-static .s3__card,.topic-static .s5__card{width:48.8%}
.topic-static .s5__card__innner{display:block;width:100%;text-decoration:none}
.s1__card-img,.s2__card-img{display:block}
.s2__card-title{text-decoration:none;font-size:calc(var(--fs-s2t) * 0.833333)}
.s2__card-title:hover{text-decoration:underline}
.s2__dot{padding:0;box-sizing:content-box;flex:none}
.s2__dot:focus-visible{outline:2px solid #007679;outline-offset:3px}
.s5__card-title{display:block}
.s1__card-img:focus-visible,.s2__card-img:focus-visible,.s5__card__innner:focus-visible{outline:3px solid #007679;outline-offset:3px}
.list-card__media{position:relative}
.list-card__play{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:clamp(32px,18%,64px);aspect-ratio:1;border:2px solid rgba(255,255,255,.9);border-radius:50%;background:rgba(0,0,0,.35);pointer-events:none;box-sizing:border-box}
.list-card__play::after{content:"";position:absolute;left:40%;top:27%;width:38%;height:46%;background:#fff;clip-path:polygon(0 0,100% 50%,0 100%)}
@media(max-width:768px){.topic-static .s1__card{width:48.8%}.topic-static .s3__card,.topic-static .s5__card{width:100%}.s2__card-title{font-size:var(--fs-s2t)}}
/* List text flows naturally: two complete title lines cannot flex-shrink. */
.list{height:auto;align-items:stretch;grid-auto-rows:auto;overflow:visible;padding-right:0}
.list-card{aspect-ratio:auto;text-decoration:none}
.list-card__media{flex:none}
.list-card__body{aspect-ratio:auto;height:auto;min-width:0;overflow:visible;flex:1 1 auto;align-items:stretch;justify-content:flex-start;gap:8px;padding:10px 4px 4px;box-sizing:border-box}
.list-card__title{display:-webkit-box;flex:none;width:100%;min-height:2.8em;margin:0;font-size:clamp(14px,1.55vw,22px);line-height:1.4;color:#fff;overflow-wrap:anywhere;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.list-card__desc{display:block;flex:none;min-width:0;padding:0}
.list-card__desc-inner{font-size:clamp(12px,1.35vw,18px);line-height:1.5;color:#fff;overflow-wrap:anywhere;-webkit-line-clamp:2}
.list-card__meta{display:flex;flex:none;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:4px 8px;width:100%;margin-top:auto;padding-top:4px;font-size:clamp(10px,1.05vw,14px);line-height:1.5;color:#fff}
.list-card__source{display:flex;flex:1 1 90px;min-width:0;white-space:nowrap}
.list-card__source [data-field-value]{min-width:0;overflow:hidden;text-overflow:ellipsis}
.list-card__date{display:block;flex:0 0 auto;width:auto;margin-left:auto;font-size:inherit;color:inherit;white-space:nowrap}
@media(max-width:768px){
  .list-card{aspect-ratio:auto;align-items:center;padding:8px;gap:12px}
  .list-card__media{width:38%;align-self:center}
  .list-card__body{padding:0;gap:6px}
  .list-card__title{font-size:clamp(14px,3vw,22px);color:#007679}
  .list-card__desc-inner{font-size:clamp(12px,2.5vw,18px);color:#676767}
  .list-card__meta{font-size:clamp(10px,2.1vw,14px);color:#007679}
}