/* ============================================================
   site.css : 公开站点（首页 / 价格 / 登录 / 帮助）
   ============================================================ */

/* ---------------- 公共导航 ---------------- */
.site-nav {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--gutter);
  z-index: 600;
  transition: background var(--t) var(--ease), border-color var(--t) var(--ease),
    backdrop-filter var(--t) var(--ease), color var(--t) var(--ease);
  border-bottom: 1px solid transparent;
  color: #fff;
}

.site-nav.solid {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(18px) saturate(180%);
  border-bottom-color: var(--line-2);
  color: var(--ink);
}

.wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
}
.wordmark .cn {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.06em;
}
.wordmark .lat {
  font-size: 10px;
  letter-spacing: 0.26em;
  font-weight: 500;
  opacity: 0.45;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}
.nav-links a {
  font-size: 13px;
  font-weight: 500;
  color: currentColor;
  opacity: 0.62;
  transition: opacity var(--t-fast) var(--ease);
  letter-spacing: 0.01em;
}
.nav-links a:hover,
.nav-links a.on {
  opacity: 1;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 10px;
}
.nav-right .btn {
  height: 36px;
  padding: 0 16px;
  font-size: 13px;
}

.nav-solid-btn {
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.2);
}
.nav-solid-btn:hover {
  background: rgba(255, 255, 255, 0.24);
}
.site-nav.solid .nav-solid-btn {
  background: var(--bg-3);
  color: var(--ink);
  border-color: transparent;
}
.site-nav.solid .nav-solid-btn:hover {
  background: var(--bg-4);
}

/* ---------------- 首页 Hero ---------------- */
.hero {
  position: relative;
  height: 100svh;
  min-height: 620px;
  background: #0a0a0a;
  color: #fff;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.62;
  transform: scale(1.04);
  animation: heroZoom 22s var(--ease-out) forwards;
}
@keyframes heroZoom {
  to {
    transform: scale(1);
  }
}
.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
      120% 80% at 50% 30%,
      rgba(0, 0, 0, 0.15) 0%,
      rgba(0, 0, 0, 0.55) 55%,
      rgba(0, 0, 0, 0.92) 100%
    ),
    linear-gradient(180deg, rgba(0, 0, 0, 0.72) 0%, transparent 34%, rgba(0, 0, 0, 0.85) 100%);
}

.hero-inner {
  position: relative;
  z-index: 2;
  text-align: center;
  padding-bottom: 15vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  height: 30px;
  padding: 0 14px;
  border-radius: var(--r-full);
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.07);
  backdrop-filter: blur(12px);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.86);
  margin-bottom: 30px;
}
.hero-kicker .dot {
  background: #fff;
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.16);
}

.hero h1 {
  font-size: clamp(46px, 7.4vw, 104px);
  font-weight: 300;
  letter-spacing: 0.02em;
  line-height: 1.06;
  margin: 0 0 26px;
  text-shadow: 0 2px 40px rgba(0, 0, 0, 0.35);
}
.hero h1 em {
  font-style: normal;
  font-weight: 600;
}

.hero-sub {
  font-size: clamp(14px, 1.2vw, 17px);
  color: rgba(255, 255, 255, 0.66);
  max-width: 620px;
  line-height: 1.7;
  margin-bottom: 38px;
  font-weight: 400;
}

.hero-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

.hero-foot {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 22px var(--gutter);
}
.hero-stat {
  padding: 0 32px;
  border-left: 1px solid rgba(255, 255, 255, 0.1);
}
.hero-stat:first-child {
  border-left: 0;
  padding-left: 0;
}
.hero-stat b {
  display: block;
  font-size: 26px;
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.hero-stat span {
  font-size: 11.5px;
  color: rgba(255, 255, 255, 0.45);
  letter-spacing: 0.06em;
}

.scroll-hint {
  position: absolute;
  bottom: 118px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  color: rgba(255, 255, 255, 0.4);
  font-size: 10px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.scroll-hint i {
  width: 1px;
  height: 34px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.5), transparent);
  animation: scrollLine 2.2s var(--ease) infinite;
}
@keyframes scrollLine {
  0% {
    transform: scaleY(0.2);
    transform-origin: top;
    opacity: 0;
  }
  50% {
    transform: scaleY(1);
    opacity: 1;
  }
  100% {
    transform: scaleY(0.2);
    transform-origin: bottom;
    opacity: 0;
  }
}

/* ---------------- 首页：三条业务线 ---------------- */
.biz-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.biz-card {
  display: flex;
  flex-direction: column;
  gap: 18px;
  group: b;
}

.biz-media {
  position: relative;
  border-radius: var(--r-l);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--warm);
}
.biz-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 1.1s var(--ease-out);
}
.biz-card:hover .biz-media img {
  transform: scale(1.05);
}
.biz-media .badge-corner {
  top: 12px;
  right: 12px;
}
.biz-meta {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}
.biz-meta h3 {
  font-size: 17px;
  letter-spacing: -0.01em;
  margin-bottom: 6px;
}
.biz-meta p {
  font-size: 13px;
  color: var(--ink-4);
  line-height: 1.6;
}
.biz-arrow {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  flex: none;
  transition: all var(--t) var(--ease);
  color: var(--ink-3);
}
.biz-card:hover .biz-arrow {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
  transform: rotate(-45deg);
}

/* ---------------- 首页：对比滑块 ---------------- */
.compare {
  position: relative;
  border-radius: var(--r-xl);
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--bg-3);
  cursor: ew-resize;
  user-select: none;
}
.compare img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.compare .after {
  clip-path: inset(0 0 0 var(--split, 50%));
}
.compare .handle {
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--split, 50%);
  width: 2px;
  background: rgba(255, 255, 255, 0.9);
  z-index: 3;
  transform: translateX(-1px);
  box-shadow: 0 0 18px rgba(0, 0, 0, 0.28);
}
.compare .handle::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 44px;
  height: 44px;
  margin: -22px 0 0 -22px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(6px);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.24);
}
.compare .handle::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 16px;
  height: 8px;
  margin: -4px 0 0 -8px;
  z-index: 4;
  background: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='10' viewBox='0 0 16 10'%3E%3Cpath d='M5 1L1 5l4 4M11 1l4 4-4 4' stroke='%23111' stroke-width='1.4' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")
    center/16px no-repeat;
}
.compare .tag-l,
.compare .tag-r {
  position: absolute;
  bottom: 18px;
  z-index: 4;
  height: 26px;
  padding: 0 12px;
  display: inline-flex;
  align-items: center;
  border-radius: var(--r-full);
  font-size: 11.5px;
  background: rgba(17, 17, 17, 0.5);
  color: #fff;
  backdrop-filter: blur(10px);
}
.compare .tag-l {
  left: 18px;
}
.compare .tag-r {
  right: 18px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--ink);
}

/* ---------------- 首页：工具矩阵 ---------------- */
.tool-mosaic {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 10px;
}

.tool-tile {
  position: relative;
  border-radius: var(--r-m);
  overflow: hidden;
  aspect-ratio: 1;
  background: var(--bg-2);
}
.tool-tile img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.9s var(--ease-out), filter var(--t) var(--ease);
}
.tool-tile:hover img {
  transform: scale(1.06);
}
.tool-tile .tt-name {
  position: absolute;
  left: 10px;
  bottom: 10px;
  z-index: 2;
  height: 24px;
  padding: 0 10px;
  display: inline-flex;
  align-items: center;
  border-radius: var(--r-full);
  background: rgba(17, 17, 17, 0.55);
  color: #fff;
  font-size: 11px;
  backdrop-filter: blur(10px);
  transition: background var(--t) var(--ease);
}
.tool-tile:hover .tt-name {
  background: rgba(17, 17, 17, 0.85);
}

/* ---------------- 首页：流程 ---------------- */
.flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}
.flow-item {
  padding: 30px 26px 0 0;
  position: relative;
}
.flow-item + .flow-item {
  padding-left: 26px;
  border-left: 1px solid var(--line-2);
}
.flow-no {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ink-5);
  margin-bottom: 16px;
}
.flow-item h4 {
  font-size: 15px;
  margin-bottom: 8px;
}
.flow-item p {
  font-size: 12.5px;
  color: var(--ink-4);
  line-height: 1.65;
}

/* ---------------- 首页：价格预览 ---------------- */
.price-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.price-mini {
  padding: 28px;
  border-radius: var(--r-l);
  background: #fff;
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: all var(--t) var(--ease);
}
.price-mini:hover {
  background: #fff;
  border-color: transparent;
  box-shadow: var(--sh-3);
  transform: translateY(-2px);
}
.price-mini .pm-name {
  font-size: 13px;
  color: var(--ink-3);
}
.price-mini .pm-price {
  font-size: 34px;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin: 4px 0 2px;
}
.price-mini .pm-price small {
  font-size: 13px;
  font-weight: 400;
  color: var(--ink-4);
  letter-spacing: 0;
}
.price-mini .pm-desc {
  font-size: 12.5px;
  color: var(--ink-4);
}

/* ---------------- 企业 CTA ---------------- */
.cta-band {
  position: relative;
  border-radius: var(--r-2xl);
  overflow: hidden;
  background: #101010;
  color: #fff;
  padding: 76px 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 48px;
}
.cta-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(80% 120% at 85% 20%, rgba(227, 216, 200, 0.16), transparent 60%);
}
.cta-band h2 {
  font-size: clamp(26px, 3vw, 40px);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.25;
  max-width: 620px;
  position: relative;
}
.cta-band p {
  margin-top: 14px;
  color: rgba(255, 255, 255, 0.5);
  font-size: 14px;
  max-width: 520px;
  line-height: 1.7;
  position: relative;
}
.cta-band .cta-act {
  position: relative;
  display: flex;
  gap: 10px;
  flex: none;
}

/* ---------------- 页脚 ---------------- */
.site-foot {
  border-top: 1px solid var(--line);
  padding: 64px 0 40px;
  background: #fff;
}
.foot-grid {
  display: grid;
  grid-template-columns: 1.6fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 56px;
}
.foot-brand p {
  font-size: 12.5px;
  color: var(--ink-4);
  line-height: 1.75;
  max-width: 300px;
  margin-top: 16px;
}
.foot-col h5 {
  font-size: 12px;
  color: var(--ink-5);
  font-weight: 500;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}
.foot-col a {
  display: block;
  font-size: 13px;
  color: var(--ink-3);
  padding: 5px 0;
  transition: color var(--t-fast) var(--ease);
}
.foot-col a:hover {
  color: var(--ink);
}
.foot-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--line-2);
  padding-top: 22px;
  font-size: 11.5px;
  color: var(--ink-5);
  gap: 16px;
  flex-wrap: wrap;
}
.foot-bottom .links {
  display: flex;
  gap: 20px;
}

/* ============================================================
   价格页
   ============================================================ */
.page-head {
  padding: calc(var(--nav-h) + 76px) 0 44px;
  text-align: center;
}
.page-head h1 {
  font-size: clamp(34px, 4vw, 52px);
  letter-spacing: -0.035em;
  font-weight: 600;
  margin-bottom: 14px;
}
.page-head p {
  color: var(--ink-4);
  font-size: 14.5px;
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

.plan-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  align-items: start;
}

.plan {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--r-l);
  padding: 26px 24px 24px;
  background: #fff;
  display: flex;
  flex-direction: column;
  transition: border-color var(--t) var(--ease), box-shadow var(--t) var(--ease),
    transform var(--t) var(--ease);
}
.plan:hover {
  box-shadow: var(--sh-2);
  transform: translateY(-2px);
}
.plan.hot {
  border-color: var(--ink);
  box-shadow: var(--sh-3);
}

.plan-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 4px;
}
.plan-name {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.plan-desc {
  font-size: 12px;
  color: var(--ink-4);
  min-height: 19px;
}
.plan-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 18px 0 4px;
}
.plan-price .cur {
  font-size: 15px;
  font-weight: 500;
}
.plan-price .amt {
  font-size: 42px;
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1;
}
.plan-price .per {
  font-size: 12.5px;
  color: var(--ink-4);
}
.plan-credit {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--ink-3);
  background: var(--bg-2);
  border-radius: var(--r-full);
  padding: 5px 11px;
  align-self: flex-start;
  margin-bottom: 18px;
}
.plan-note {
  font-size: 12.5px;
  color: var(--ink-4);
  line-height: 1.65;
  min-height: 62px;
  margin-bottom: 18px;
}
.plan-feats {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding-top: 18px;
  border-top: 1px solid var(--line-2);
}
.plan-feats li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 12.5px;
  color: var(--ink-3);
  line-height: 1.5;
}
.plan-feats li::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--ink-5);
  margin-top: 7px;
  flex: none;
}
.plan .btn {
  margin-bottom: 18px;
}

.credit-packs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.pack {
  border: 1px solid var(--line);
  border-radius: var(--r-l);
  padding: 22px;
  transition: all var(--t) var(--ease);
  cursor: pointer;
}
.pack:hover {
  border-color: var(--ink-6);
  background: #fcfcfc;
}
.pack .pk-amt {
  font-size: 13px;
  color: var(--ink-4);
}
.pack .pk-price {
  font-size: 26px;
  font-weight: 600;
  letter-spacing: -0.03em;
  margin: 6px 0 2px;
}
.pack .pk-rate {
  font-size: 11.5px;
  color: var(--ink-5);
}

.faq-list {
  border-top: 1px solid var(--line);
}
.faq-item {
  border-bottom: 1px solid var(--line-2);
}
.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 20px 2px;
  font-size: 14.5px;
  font-weight: 500;
  width: 100%;
  text-align: left;
  cursor: pointer;
}
.faq-q svg {
  transition: transform var(--t) var(--ease);
  color: var(--ink-5);
  flex: none;
}
.faq-item.open .faq-q svg {
  transform: rotate(45deg);
}
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease);
}
.faq-a p {
  padding: 0 2px 22px;
  font-size: 13px;
  color: var(--ink-4);
  line-height: 1.8;
  max-width: 760px;
}

/* ============================================================
   登录页
   ============================================================ */
.login {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  min-height: 100svh;
}
.login-visual {
  position: relative;
  background: #0c0c0c;
  overflow: hidden;
}
.login-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.85;
}
.login-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.46) 0%, rgba(0, 0, 0, 0.06) 26%, rgba(0, 0, 0, 0.32) 62%, rgba(0, 0, 0, 0.78) 100%);
}
.login-visual .lv-text {
  position: absolute;
  left: 56px;
  bottom: 64px;
  z-index: 2;
  color: #fff;
}
.login-visual .lv-text h2 {
  font-size: 40px;
  font-weight: 300;
  line-height: 1.25;
  letter-spacing: 0.01em;
  margin-bottom: 14px;
}
.login-visual .lv-text p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
  max-width: 320px;
  line-height: 1.7;
}
.login-visual .lv-brand {
  position: absolute;
  left: 56px;
  top: 44px;
  z-index: 2;
  color: #fff;
}

.login-form-side {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 40px;
  background: #fff;
}
.login-box {
  width: 100%;
  max-width: 348px;
}
.login-box h1 {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}
.login-box .sub {
  font-size: 13px;
  color: var(--ink-4);
  margin-bottom: 30px;
}
.login-tabs {
  display: flex;
  gap: 26px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 26px;
}
.login-tabs button {
  padding: 0 0 12px;
  font-size: 13.5px;
  color: var(--ink-4);
  position: relative;
  transition: color var(--t-fast) var(--ease);
}
.login-tabs button.on {
  color: var(--ink);
  font-weight: 500;
}
.login-tabs button.on::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1.5px;
  background: var(--ink);
}
.login-box .field {
  margin-bottom: 16px;
}
.code-row {
  display: flex;
  gap: 8px;
}
.code-row .input {
  flex: 1;
}
.code-row .btn {
  flex: none;
  height: 44px;
  padding: 0 14px;
  font-size: 12.5px;
  border-radius: var(--r-m);
  background: var(--bg-3);
}
.login-legal {
  margin: 18px 0 22px;
}
.login-foot {
  margin-top: 30px;
  font-size: 12px;
  color: var(--ink-5);
  text-align: center;
}
.login-foot a {
  color: var(--ink-3);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (max-width: 1000px) {
  .login {
    grid-template-columns: 1fr;
  }
  .login-visual {
    display: none;
  }
  .plan-grid,
  .credit-packs,
  .biz-grid,
  .price-strip {
    grid-template-columns: 1fr;
  }
  .tool-mosaic {
    grid-template-columns: repeat(3, 1fr);
  }
  .flow {
    grid-template-columns: 1fr 1fr;
  }
  .flow-item + .flow-item {
    border-left: 0;
  }
  .foot-grid {
    grid-template-columns: 1fr 1fr;
  }
  .cta-band {
    flex-direction: column;
    align-items: flex-start;
    padding: 44px 28px;
  }
  .nav-links {
    display: none;
  }
  .hero-foot {
    grid-template-columns: 1fr 1fr;
    gap: 20px 0;
  }
  .hero-stat:nth-child(odd) {
    border-left: 0;
    padding-left: 0;
  }
}