/* ==========================================================================
   运达娱乐 · modules.css
   --------------------------------------------------------------------------
   组件层：顶栏 / 全屏菜单 / 主视觉 / 排期板 / 账簿行 / 栏块 / 表单 / 页脚
   ========================================================================== */

/* ---------- 顶栏 ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bone);
  border-bottom: 1px solid var(--line);
  transition: background 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.topbar.is-stuck {
  background: rgba(242, 240, 234, 0.95);
  -webkit-backdrop-filter: saturate(150%) blur(10px);
  backdrop-filter: saturate(150%) blur(10px);
}

.topbar__grid {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(14px, 2.2vw, 36px);
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding-inline: var(--pad);
  height: var(--bar);
}

.sig {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: none;
}

.sig__mark {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  background: var(--ink);
  color: var(--bone);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.sig__text {
  display: flex;
  flex-direction: column;
  line-height: 1.08;
}

.sig__text b {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.sig__text em {
  margin-top: 4px;
  font-family: var(--mono);
  font-style: normal;
  font-size: 8px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--mute);
}

.nav {
  display: flex;
  justify-content: flex-end;
  gap: clamp(10px, 1.5vw, 24px);
  min-width: 0;
}

.nav a {
  position: relative;
  padding: 3px 0;
  font-size: 13.5px;
  letter-spacing: 0.01em;
  color: var(--ink-2);
  white-space: nowrap;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--red);
  transition: width 0.28s var(--ease);
}

.nav a:hover::after,
.nav a[aria-current="page"]::after {
  width: 100%;
}

.nav a[aria-current="page"] {
  color: var(--red);
}

.topbar__cta {
  display: flex;
  align-items: center;
  gap: 16px;
  flex: none;
}

.topbar__cta .lnk {
  font-size: 10.5px;
  border-bottom-color: transparent;
}

.menu-btn {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: transparent;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  padding: 0;
}

.menu-btn span {
  display: block;
  width: 17px;
  height: 1.5px;
  background: var(--ink);
  transition: transform 0.28s var(--ease), opacity 0.2s;
}

.menu-btn[aria-expanded="true"] span:first-child {
  transform: translateY(3.25px) rotate(45deg);
}

.menu-btn[aria-expanded="true"] span:last-child {
  transform: translateY(-3.25px) rotate(-45deg);
}

/* ---------- 全屏菜单 ---------- */
.menu {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  flex-direction: column;
  padding: 0 var(--pad) 24px;
  background: var(--ink);
  color: var(--bone);
  transform: translateY(-100%);
  visibility: hidden;
  transition: transform 0.48s var(--ease), visibility 0s linear 0.48s;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.menu.is-open {
  transform: translateY(0);
  visibility: visible;
  transition: transform 0.48s var(--ease), visibility 0s;
}

.menu__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--bar);
  border-bottom: 1px solid var(--line-inv);
  flex: none;
}

.menu__top .sig__mark {
  background: var(--bone);
  color: var(--ink);
}

.menu__top .sig__text em {
  color: rgba(242, 240, 234, 0.5);
}

.menu__close {
  width: 42px;
  height: 42px;
  border: 1px solid var(--line-inv);
  background: transparent;
  color: var(--bone);
  font-family: var(--mono);
  font-size: 18px;
  line-height: 1;
}

.menu__close:hover {
  background: var(--red);
  border-color: var(--red);
}

.menu__body {
  flex: 1 1 auto;
  padding-top: clamp(16px, 3vw, 32px);
}

.menu__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: clamp(24px, 4vw, 64px);
  border-top: 1px solid var(--line-inv);
}

.menu__link {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: clamp(12px, 1.9vw, 20px) 0;
  border-bottom: 1px solid var(--line-inv);
  font-size: clamp(1.15rem, 2.2vw, 1.72rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--bone);
}

.menu__link span {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.16em;
  color: var(--red);
}

.menu__link:hover {
  color: var(--red);
  padding-left: 8px;
  transition: padding 0.24s var(--ease);
}

.menu__meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 14px 30px;
  padding-top: 22px;
  border-top: 1px solid var(--line-inv);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: rgba(242, 240, 234, 0.5);
  text-transform: uppercase;
}

.menu__meta a {
  color: rgba(242, 240, 234, 0.76);
}

/* ---------- 滚动条幅 ---------- */
.ticker {
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: var(--bone);
}

.ticker__track {
  display: flex;
  width: max-content;
  animation: ticker-run 38s linear infinite;
}

.ticker:hover .ticker__track {
  animation-play-state: paused;
}

.ticker__item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 24px;
  border-right: 1px solid var(--line-soft);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--mute);
  white-space: nowrap;
}

.ticker__item::before {
  content: "";
  width: 5px;
  height: 5px;
  background: var(--red);
  flex: none;
}

.ticker__item b {
  color: var(--ink);
  font-weight: 700;
}

@keyframes ticker-run {
  to {
    transform: translateX(-50%);
  }
}

/* ---------- 主视觉 ---------- */
.hero {
  padding-block: clamp(26px, 3.4vw, 46px) clamp(28px, 3.6vw, 54px);
  border-bottom: 1px solid var(--line);
}

.hero__top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  padding-bottom: 12px;
  margin-bottom: clamp(24px, 3.4vw, 46px);
  border-bottom: 1px solid var(--line);
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.24fr) minmax(0, 0.76fr);
  gap: clamp(28px, 4.4vw, 72px);
  align-items: end;
}

.hero h1 {
  margin-bottom: 24px;
}

.hero__sub {
  max-width: 54ch;
  color: var(--mute);
  font-size: clamp(1rem, 1.2vw, 1.1rem);
}

.hero__act {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 18px;
  margin-top: 28px;
}

/* 排期板 */
.slate {
  border: 1px solid var(--ink);
  background: var(--bone);
  display: flex;
  flex-direction: column;
}

.slate__hd {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 11px 15px;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--ink);
}

.slate__hd .mono {
  margin-left: auto;
  font-size: 9.5px;
  color: var(--mute);
}

.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--red);
  animation: blink 1.3s steps(1) infinite;
  flex: none;
}

@keyframes blink {
  50% {
    opacity: 0.12;
  }
}

.slate__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.slate__row {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: baseline;
  padding: 11px 15px;
  border-bottom: 1px solid var(--line-soft);
}

.slate__row:last-child {
  border-bottom: 0;
}

.slate__row > .mono {
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--mute);
}

.slate__row b {
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.slate__row em {
  font-style: normal;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--red);
}

.slate__ft {
  margin-top: auto;
  padding: 10px 15px;
  border-top: 1px solid var(--line);
  background: var(--bone-2);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  color: var(--mute);
}

/* 数据带 */
.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: clamp(28px, 3.6vw, 48px) 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
}

.stat {
  padding-right: 18px;
  border-right: 1px solid var(--line-soft);
}

.stat:last-child {
  border-right: 0;
}

.stat__n {
  display: block;
  font-size: clamp(1.7rem, 3vw, 2.6rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.05em;
  font-variant-numeric: tabular-nums;
}

.stat__n sup {
  font-size: 0.38em;
  font-weight: 700;
  color: var(--red);
  vertical-align: super;
  letter-spacing: 0;
}

.stat__k {
  display: block;
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--mute);
}

/* ---------- 页头 ---------- */
.pagehead {
  position: relative;
  overflow: hidden;
  padding-block: clamp(32px, 4.6vw, 62px) clamp(26px, 3.4vw, 46px);
  border-bottom: 1px solid var(--line);
}

.pagehead__no {
  position: absolute;
  right: var(--pad);
  top: clamp(10px, 2vw, 24px);
  font-family: var(--mono);
  font-size: clamp(86px, 15vw, 210px);
  line-height: 0.78;
  font-weight: 700;
  letter-spacing: -0.08em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(19, 19, 17, 0.16);
  pointer-events: none;
  user-select: none;
}

.pagehead__in {
  position: relative;
  z-index: 1;
  max-width: 74rem;
}

.pagehead h1 {
  font-size: clamp(2.1rem, 4.8vw, 4.1rem);
  max-width: 22ch;
  margin: 16px 0 0;
}

.pagehead__lead {
  max-width: 62ch;
  margin-top: 20px;
  color: var(--mute);
  font-size: clamp(1rem, 1.2vw, 1.1rem);
}

.pagehead__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 34px;
  margin-top: 26px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--mute);
}

.pagehead__meta b {
  color: var(--ink);
  font-weight: 400;
}

/* 面包屑 */
.crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 14px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mute);
}

.crumb a {
  color: var(--mute);
}

.crumb i {
  font-style: normal;
  opacity: 0.5;
}

.crumb [aria-current="page"] {
  color: var(--ink);
  text-transform: none;
  letter-spacing: 0.02em;
}

/* ---------- 章节戳 ---------- */
.stamp {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 18px;
  padding-top: 13px;
  margin-bottom: clamp(24px, 3vw, 40px);
  border-top: 1px solid var(--ink);
}

.stamp__no {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--red);
}

.stamp h2 {
  margin: 0;
  font-size: clamp(1.25rem, 2vw, 1.75rem);
}

.stamp__meta {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mute);
}

.band--ink .stamp {
  border-top-color: var(--line-inv);
}

.band--ink .stamp h2 {
  color: var(--bone);
}

/* ---------- 账簿行 ---------- */
.ledger {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--ink);
}

.ledger__item {
  margin: 0;
}

.ledger__row {
  position: relative;
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr) minmax(140px, 220px) 26px;
  gap: 18px;
  align-items: center;
  padding: 22px 12px 22px 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  transition: background 0.26s var(--ease), color 0.26s var(--ease),
    padding 0.26s var(--ease);
}

.ledger__row::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0;
  height: 1px;
  background: var(--red);
  transition: width 0.42s var(--ease);
}

.ledger__row:hover {
  padding-left: 16px;
  background: var(--ink);
  color: var(--bone);
}

.ledger__row:hover::before {
  width: 100%;
}

.ledger__no {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mute);
}

.ledger__row:hover .ledger__no {
  color: var(--red);
}

.ledger__row h3 {
  margin: 0 0 4px;
  font-size: clamp(1rem, 1.35vw, 1.2rem);
}

.ledger__row p {
  margin: 0;
  max-width: 58ch;
  font-size: 0.89rem;
  line-height: 1.6;
  color: var(--mute);
}

.ledger__row:hover p,
.ledger__row:hover .ledger__meta {
  color: rgba(242, 240, 234, 0.7);
}

.ledger__meta {
  text-align: right;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mute);
}

.ledger__arrow {
  justify-self: end;
  font-family: var(--mono);
  font-size: 14px;
  color: var(--mute);
  transition: transform 0.26s var(--ease), color 0.26s;
}

.ledger__row:hover .ledger__arrow {
  transform: translateX(4px);
  color: var(--red);
}

/* ---------- 左栏 + 右栏 ---------- */
.split {
  display: grid;
  grid-template-columns: minmax(0, 250px) minmax(0, 1fr);
  gap: clamp(20px, 4vw, 64px);
  align-items: start;
}

.split__aside {
  position: sticky;
  top: calc(var(--bar) + 26px);
  align-self: start;
}

.split__aside .mono {
  display: block;
  margin-bottom: 10px;
}

.split__aside h2 {
  font-size: clamp(1.25rem, 1.9vw, 1.6rem);
  margin-bottom: 12px;
}

.split__aside p {
  font-size: 0.88rem;
  color: var(--mute);
  margin: 0;
}

.band--ink .split__aside p {
  color: rgba(242, 240, 234, 0.6);
}

/* ---------- 栏块 ---------- */
.tiles {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.tiles--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.tile {
  display: flex;
  flex-direction: column;
  padding: clamp(18px, 2.3vw, 32px);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--bone);
  transition: background 0.24s var(--ease);
}

.tile:hover {
  background: #fbfaf7;
}

.tile__no {
  display: block;
  margin-bottom: 20px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--red);
}

.tile h3 {
  margin-bottom: 8px;
  font-size: 1.05rem;
}

.tile p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--mute);
}

.tile__link {
  margin-top: auto;
  padding-top: 18px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mute);
}

.tile:hover .tile__link {
  color: var(--red);
}

.band--ink .tiles {
  border-color: var(--line-inv);
}

.band--ink .tile {
  background: var(--ink);
  border-color: var(--line-inv);
}

.band--ink .tile:hover {
  background: #1c1c19;
}

.band--ink .tile p {
  color: rgba(242, 240, 234, 0.62);
}

/* ---------- 面板 ---------- */
.panel {
  padding: clamp(18px, 2.4vw, 30px);
  border: 1px solid var(--line);
  background: transparent;
}

.panel__hd {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 12px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--line-soft);
}

.panel__hd h3 {
  margin: 0;
  font-size: 1rem;
}

.panel p:last-child {
  margin-bottom: 0;
}

.panel--ink {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--bone);
}

.panel--ink p {
  color: rgba(242, 240, 234, 0.72);
}

.panel--ink .panel__hd {
  border-color: var(--line-inv);
}

.panel--red {
  background: var(--red);
  border-color: var(--red);
  color: #fff;
}

.panel--red p {
  color: rgba(255, 255, 255, 0.9);
}

.panel--red .panel__hd {
  border-color: rgba(255, 255, 255, 0.32);
}

/* ---------- 流程步骤 ---------- */
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.step {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
  margin: 0;
}

.step__no {
  padding-top: 3px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--red);
}

.step h3 {
  margin-bottom: 4px;
  font-size: 1rem;
}

.step p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--mute);
}

.band--ink .step {
  border-color: var(--line-inv-soft);
}

.band--ink .steps {
  border-top-color: var(--line-inv);
}

/* ---------- 规格表 ---------- */
.spec {
  margin: 0;
  border-top: 1px solid var(--line);
}

.spec__row {
  display: grid;
  grid-template-columns: minmax(84px, 148px) minmax(0, 1fr);
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line-soft);
}

.spec dt {
  padding-top: 2px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mute);
}

.spec dd {
  margin: 0;
  font-size: 0.92rem;
}

.band--ink .spec,
.band--ink .spec__row {
  border-color: var(--line-inv);
}

.band--ink .spec dd {
  color: rgba(242, 240, 234, 0.82);
}

/* ---------- 直播节目板 ---------- */
.board {
  width: 100%;
  border-top: 1px solid var(--ink);
}

.board__row {
  display: grid;
  grid-template-columns: 74px minmax(0, 1.7fr) minmax(0, 1fr) 108px;
  gap: 14px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 0.92rem;
}

.board__row--hd {
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--mute);
}

.board__row strong {
  font-weight: 700;
}

.board__row .mono {
  font-size: 9.5px;
  letter-spacing: 0.06em;
}

.board__tag {
  justify-self: start;
  padding: 2px 8px;
  border: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mute);
}

.board__tag--live {
  border-color: var(--red);
  color: var(--red);
}

/* ---------- 案例 ---------- */
.cases {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.case {
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--bone);
}

.case__body {
  padding: 16px 20px 22px;
}

.case__meta {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--mute);
}

.case h3 {
  margin-bottom: 6px;
  font-size: 1rem;
}

.case p {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--mute);
}

.case:hover h3 {
  color: var(--red);
}

/* CSS 图版（无图片依赖） */
.art {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: var(--bone-2);
}

.art::after {
  content: attr(data-mark);
  position: absolute;
  right: 12px;
  bottom: -6px;
  font-family: var(--mono);
  font-size: clamp(30px, 4vw, 52px);
  font-weight: 700;
  letter-spacing: -0.07em;
  color: rgba(19, 19, 17, 0.14);
}

.art--a {
  background-image: linear-gradient(135deg, var(--ink) 0 47%, transparent 47%),
    linear-gradient(0deg, var(--red) 0 13%, transparent 13%);
}

.art--b {
  background-image: repeating-linear-gradient(
      90deg,
      var(--ink) 0 7px,
      transparent 7px 28px
    ),
    linear-gradient(0deg, var(--ink) 0 9%, transparent 9%);
}

.art--c {
  background-image: linear-gradient(90deg, transparent 0 62%, var(--red) 62%),
    linear-gradient(0deg, var(--ink) 0 34%, transparent 34%);
}

.art--d {
  background-image: linear-gradient(180deg, transparent 0 58%, var(--ink) 58%),
    repeating-linear-gradient(
      0deg,
      var(--bone-3) 0 1px,
      transparent 1px 18px
    );
}

.art--e {
  background-image: linear-gradient(45deg, var(--red) 0 26%, transparent 26%),
    linear-gradient(180deg, var(--ink) 0 18%, transparent 18%),
    repeating-linear-gradient(
      90deg,
      var(--bone-3) 0 1px,
      transparent 1px 22px
    );
}

.art--f {
  background-image: linear-gradient(135deg, transparent 0 55%, var(--ink) 55%),
    linear-gradient(315deg, var(--red) 0 22%, transparent 22%);
}

/* ---------- 问答 ---------- */
.qa {
  border-top: 1px solid var(--line);
}

.qa__item {
  border-bottom: 1px solid var(--line);
}

.qa__item summary {
  display: flex;
  align-items: flex-start;
  gap: 15px;
  padding: 17px 0;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  font-size: 0.98rem;
}

.qa__item summary::-webkit-details-marker {
  display: none;
}

.qa__item summary::before {
  content: "+";
  flex: none;
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 400;
  line-height: 1.35;
  color: var(--red);
}

.qa__item[open] summary::before {
  content: "\2212";
}

.qa__item summary:hover {
  color: var(--red);
}

.qa__a {
  padding: 0 0 18px 29px;
  color: var(--mute);
  font-size: 0.92rem;
  line-height: 1.72;
}

.qa__a p:last-child {
  margin-bottom: 0;
}

.band--ink .qa,
.band--ink .qa__item {
  border-color: var(--line-inv);
}

.band--ink .qa__a {
  color: rgba(242, 240, 234, 0.65);
}

/* ---------- 表单 ---------- */
.form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 22px;
  padding-top: 24px;
  border-top: 1px solid var(--ink);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field--full {
  grid-column: 1 / -1;
}

.field label {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mute);
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 9px 0;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 0.97rem;
  transition: border-color 0.2s;
}

.field select {
  appearance: none;
  -webkit-appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--ink) 50%),
    linear-gradient(135deg, var(--ink) 50%, transparent 50%);
  background-position: calc(100% - 10px) 55%, calc(100% - 5px) 55%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 24px;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-bottom-color: var(--red);
}

.field textarea {
  min-height: 100px;
  resize: vertical;
}

.field--err input,
.field--err textarea {
  border-bottom-color: var(--red);
}

.check {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--mute);
}

.check input {
  margin-top: 4px;
  accent-color: var(--red);
  flex: none;
}

.form__foot {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 18px;
}

.form__msg {
  min-height: 1.1em;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--red);
}

.form__msg.is-ok {
  color: #1c7a4c;
}

/* ---------- 文章 ---------- */
.article__head {
  padding-block: clamp(26px, 3.6vw, 48px) clamp(22px, 3vw, 36px);
  border-bottom: 1px solid var(--line);
}

.article__head h1 {
  font-size: clamp(1.9rem, 4.2vw, 3.3rem);
  max-width: 26ch;
  margin: 14px 0 18px;
}

.article__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mute);
}

.article__body {
  max-width: 74ch;
}

.article__body > p,
.article__body > ul li,
.article__body > ol li {
  font-size: 1.02rem;
  line-height: 1.82;
  color: var(--mute);
}

.article__body h2 {
  margin-top: 2.1em;
  font-size: clamp(1.3rem, 1.9vw, 1.7rem);
}

.article__body h3 {
  margin-top: 1.7em;
}

.article__body strong {
  color: var(--ink);
}

.article__body blockquote {
  margin: 30px 0;
  padding: 4px 0 4px 20px;
  border-left: 3px solid var(--red);
  font-size: 1.14rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--ink);
}

.article__body blockquote p {
  margin: 0;
  color: inherit;
}

.article__body .spec {
  margin: 26px 0;
}

.toc {
  position: sticky;
  top: calc(var(--bar) + 26px);
  border-top: 1px solid var(--ink);
  padding-top: 12px;
}

.toc__t {
  margin-bottom: 10px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mute);
}

.toc ol {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: toc;
}

.toc li {
  counter-increment: toc;
  margin: 0;
  border-bottom: 1px solid var(--line-soft);
}

.toc a {
  display: flex;
  gap: 10px;
  padding: 8px 0;
  font-size: 0.85rem;
  color: var(--mute);
  line-height: 1.45;
}

.toc a::before {
  content: counter(toc, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 9px;
  color: var(--red);
  padding-top: 3px;
}

.toc a:hover {
  color: var(--ink);
}

/* ---------- 联系信息 ---------- */
.info {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.info li {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 0.93rem;
  margin: 0;
}

.info b {
  padding-top: 3px;
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mute);
}

/* ---------- CTA ---------- */
.cta {
  padding-block: clamp(46px, 6vw, 86px);
  border-top: 1px solid var(--ink);
}

.cta__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.42fr) minmax(0, 0.58fr);
  gap: 26px;
  align-items: end;
}

.cta h2 {
  font-size: clamp(1.7rem, 3.8vw, 3.1rem);
  margin-bottom: 12px;
}

.cta__act {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.band--ink .cta {
  border-top-color: var(--line-inv);
}

/* ---------- 页脚 ---------- */
.foot {
  padding-top: clamp(40px, 5vw, 68px);
  background: var(--ink);
  color: var(--bone);
}

.foot__word {
  margin: 0 0 clamp(24px, 3vw, 40px);
  font-size: clamp(3.2rem, 13.5vw, 10.5rem);
  font-weight: 800;
  line-height: 0.78;
  letter-spacing: -0.07em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(242, 240, 234, 0.3);
  user-select: none;
  white-space: nowrap;
}

.foot__grid {
  display: grid;
  grid-template-columns: 1.5fr 0.8fr 0.8fr 1.1fr;
  gap: 26px;
  padding-bottom: 36px;
}

.foot__t {
  margin-bottom: 12px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(242, 240, 234, 0.44);
}

.foot__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 7px;
  font-size: 0.87rem;
}

.foot__list li {
  margin: 0;
}

.foot__list a {
  color: rgba(242, 240, 234, 0.78);
}

.foot__list a:hover {
  color: var(--red);
}

.foot p {
  color: rgba(242, 240, 234, 0.6);
  font-size: 0.87rem;
}

.foot__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  padding-block: 14px;
  border-top: 1px solid var(--line-inv);
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.08em;
  color: rgba(242, 240, 234, 0.42);
}

.foot__disc {
  padding: 16px 0 26px;
  border-top: 1px solid var(--line-inv-soft);
  font-size: 0.76rem;
  line-height: 1.7;
  color: rgba(242, 240, 234, 0.4);
}

.foot .sig__mark {
  background: var(--bone);
  color: var(--ink);
}

.foot .sig__text em {
  color: rgba(242, 240, 234, 0.5);
}

.foot .sig__text b {
  color: var(--bone);
}

/* ---------- 回顶 ---------- */
.to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 80;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: var(--bone);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.24s var(--ease), transform 0.24s var(--ease);
}

.to-top.is-on {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}

.to-top:hover {
  background: var(--ink);
  color: var(--bone);
  border-color: var(--ink);
}

/* ---------- 滚动揭示 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.62s var(--ease), transform 0.62s var(--ease);
}

[data-reveal].is-in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .ticker__track,
  .dot {
    animation: none;
  }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1180px) {
  .nav {
    gap: 12px;
  }

  .nav a {
    font-size: 12.5px;
  }
}

@media (max-width: 1080px) {
  .nav,
  .topbar__cta .lnk {
    display: none;
  }

  .menu-btn {
    display: inline-flex;
  }

  .topbar__grid {
    grid-template-columns: auto minmax(0, 1fr) auto;
  }

  .topbar__cta {
    justify-self: end;
  }

  .hero__grid {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
  }

  .slate {
    max-width: 560px;
  }

  .split {
    grid-template-columns: minmax(0, 1fr);
  }

  .split__aside,
  .toc {
    position: static;
  }

  .tiles,
  .cases {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .foot__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cta__grid {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
  }
}

@media (max-width: 860px) {
  .menu__grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 0;
  }

  .stat:nth-child(2) {
    border-right: 0;
  }

  .ledger__row {
    grid-template-columns: 46px minmax(0, 1fr) 20px;
    gap: 12px;
    padding-block: 18px;
  }

  .ledger__meta {
    display: none;
  }

  .board__row {
    grid-template-columns: 58px minmax(0, 1fr) 80px;
    gap: 10px;
    font-size: 0.88rem;
  }

  .board__row > :nth-child(3) {
    display: none;
  }

  .article__head h1 {
    max-width: 100%;
  }
}

@media (max-width: 620px) {
  .topbar__cta .btn {
    padding: 9px 12px;
    font-size: 10px;
  }

  .sig__text em {
    display: none;
  }

  .tiles,
  .tiles--2,
  .cases {
    grid-template-columns: minmax(0, 1fr);
  }

  .form {
    grid-template-columns: minmax(0, 1fr);
  }

  .cta__act .btn {
    width: 100%;
  }

  .foot__grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .foot__word {
    font-size: clamp(2.4rem, 17vw, 4rem);
  }

  .slate__row {
    grid-template-columns: 46px minmax(0, 1fr);
  }

  .slate__row em {
    display: none;
  }
}