/* ============================================================
   Meridian 首页 · 专属样式
   通用 token / reset / 背景氛围 / 玻璃 / 按钮 / 链接 / 动效
   全部继承 ../auth.css，本文件只写首页独有的版式区块
   ============================================================ */

.page {
  position: relative;
  z-index: 1;
  margin: 0 auto;
  max-width: 76rem;
  padding: 0 1.25rem;
}

/* ---------- 顶栏 ---------- */

/* .mark 在 auth.html 里是 div，这里用作 <a>：UA 的 a{color} 会盖掉继承色，必须显式收回 */
a.mark {
  color: var(--ink);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 4.5rem;
}

.nav-links {
  display: none;
  align-items: center;
  gap: 2.25rem;
}

.nav-link {
  position: relative;
  font-size: 13.5px;
  color: var(--ink-soft);
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--ink);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  height: 2.5rem;
  padding: 0 1.125rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: oklch(0.255 0.022 265 / 45%);
  font-family: var(--font-display);
  font-size: 13.5px;
  font-weight: 500;
  color: var(--ink);
  transition:
    background 0.2s,
    border-color 0.2s,
    transform 0.12s var(--ease);
}

.nav-cta svg {
  width: 14px;
  height: 14px;
  transition: transform 0.24s var(--ease);
}

.nav-cta:hover {
  background: var(--field-hover);
  border-color: oklch(0.76 0.13 62 / 45%);
}

.nav-cta:hover svg {
  transform: translateX(3px);
}

.nav-cta:active {
  transform: translateY(1px);
}

/* ---------- Hero ---------- */
.hero {
  padding: 3.5rem 0 4rem;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  height: 2rem;
  padding: 0 0.875rem 0 0.625rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: oklch(0.215 0.024 265 / 60%);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  font-size: 12px;
  color: var(--ink-soft);
}

.hero-tag i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 3px oklch(0.78 0.14 155 / 18%);
  animation: pulse-dot 2.4s ease-in-out infinite;
}

.hero h1 {
  margin-top: 1.75rem;
  max-width: 22ch;
  font-family: var(--font-display);
  font-size: clamp(2.35rem, 6.4vw, 4.15rem);
  font-weight: 300;
  line-height: 1.08;
  letter-spacing: -0.025em;
}

.hero h1 em {
  font-style: normal;
  color: var(--beam);
}

.hero-lede {
  margin-top: 1.5rem;
  max-width: 34rem;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2.25rem;
}

.btn-hero {
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  height: 3rem;
  padding: 0 1.5rem;
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-size: 14.5px;
  font-weight: 500;
  transition:
    filter 0.2s,
    transform 0.12s var(--ease);
}

.btn-hero svg {
  width: 15px;
  height: 15px;
  transition: transform 0.24s var(--ease);
}

.btn-hero:active {
  transform: translateY(1px);
}

.btn-hero.beam {
  background: linear-gradient(180deg, var(--beam), var(--beam-deep));
  color: var(--on-beam);
  box-shadow: var(--shadow-beam);
}

.btn-hero.beam:hover {
  filter: brightness(1.08);
}

.btn-hero.beam:hover svg {
  transform: translateX(3px);
}

.btn-hero.ghost {
  border: 1px solid var(--line-strong);
  background: oklch(0.255 0.022 265 / 40%);
  color: var(--ink);
}

.btn-hero.ghost:hover {
  background: var(--field-hover);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
  margin-top: 2.5rem;
  list-style: none;
  padding: 0;
  font-size: 13px;
  color: var(--ink-faint);
}

.hero-meta li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hero-meta li::before {
  content: "";
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--beam);
}

/* ---------- 预览卡 ---------- */
.preview {
  margin-top: 3.5rem;
}

.preview-card {
  position: relative;
  overflow: hidden;
  border-radius: calc(var(--radius) + 12px);
}

.preview-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  height: 2.75rem;
  padding: 0 1rem;
  border-bottom: 1px solid var(--line);
}

.preview-bar i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--line-strong);
}

.preview-bar span {
  margin-left: 0.75rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}

.preview-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  padding: 1.25rem;
}

.mini-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.chart {
  display: flex;
  align-items: flex-end;
  gap: 0.5rem;
  height: 9.5rem;
  margin-top: 1rem;
}

.chart i {
  flex: 1;
  border-radius: 5px 5px 2px 2px;
  background: linear-gradient(180deg, oklch(0.76 0.13 62 / 85%), oklch(0.58 0.11 235 / 35%));
  transform-origin: bottom;
  animation: grow-y 0.9s var(--ease) both;
  animation-delay: var(--d, 0ms);
}

.chart i.dim {
  background: linear-gradient(180deg, oklch(0.94 0.01 250 / 22%), oklch(0.94 0.01 250 / 6%));
}

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.kpi {
  padding: 0.875rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: oklch(0.255 0.022 265 / 35%);
}

.kpi b {
  display: block;
  margin-top: 0.375rem;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.kpi s {
  display: inline-block;
  margin-top: 0.25rem;
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ok);
}

.kpi s.down {
  color: var(--danger);
}

/* ---------- 分区标题 ---------- */
.band {
  padding: 4.5rem 0;
}

.band-head {
  max-width: 34rem;
}

.band-head h2 {
  margin-top: 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.4vw, 2.35rem);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.band-head p {
  margin-top: 0.875rem;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 能力卡 ---------- */
.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 2.5rem;
}

.cap {
  position: relative;
  overflow: hidden;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 4px);
  background: oklch(0.215 0.024 265 / 55%);
  transition:
    border-color 0.24s,
    background 0.24s,
    transform 0.24s var(--ease);
}

.cap::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--beam), transparent);
  transform: scaleX(0);
  transition: transform 0.4s var(--ease);
}

.cap:hover {
  border-color: var(--line-strong);
  background: oklch(0.245 0.026 265 / 75%);
  transform: translateY(-3px);
}

.cap:hover::after {
  transform: scaleX(1);
}

.cap-icon {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: oklch(0.255 0.022 265 / 60%);
  color: var(--beam);
}

.cap-icon svg {
  width: 18px;
  height: 18px;
}

.cap h3 {
  margin-top: 1.125rem;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 500;
}

.cap p {
  margin-top: 0.5rem;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 流程 ---------- */
.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 2.5rem;
  counter-reset: step;
}

.step {
  position: relative;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}

.step::before {
  counter-increment: step;
  content: "0" counter(step);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--beam);
}

.step h3 {
  margin-top: 0.75rem;
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 500;
}

.step p {
  margin-top: 0.5rem;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 数据条 ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem 1rem;
  padding: 2.5rem 0;
  border-block: 1px solid var(--line);
}

.stat b {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 300;
  letter-spacing: -0.02em;
}

.stat b i {
  font-style: normal;
  color: var(--beam);
}

.stat span {
  display: block;
  margin-top: 0.375rem;
  font-size: 12.5px;
  color: var(--ink-faint);
}

/* ---------- 引言 ---------- */
.quote {
  max-width: 46rem;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  font-weight: 300;
  line-height: 1.45;
  letter-spacing: -0.015em;
}

.quote em {
  font-style: normal;
  color: var(--beam);
}

.quote-by {
  margin-top: 1.5rem;
  font-size: 13px;
  color: var(--ink-faint);
}

/* ---------- 结尾 CTA ---------- */
.closer {
  position: relative;
  overflow: hidden;
  margin: 4.5rem 0 5rem;
  padding: 3rem 1.5rem;
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 12px);
  background:
    radial-gradient(40rem 18rem at 18% 0%, oklch(0.62 0.15 62 / 18%), transparent 62%),
    oklch(0.215 0.024 265 / 70%);
  text-align: center;
}

.closer h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 300;
  letter-spacing: -0.02em;
}

.closer p {
  margin: 0.875rem auto 0;
  max-width: 28rem;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.closer .hero-actions {
  justify-content: center;
  margin-top: 2rem;
}

/* ---------- 页脚 ---------- */
.foot {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  color: var(--ink-faint);
}

.foot-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

/* ---------- 入场揭示 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition:
    opacity 0.7s var(--ease),
    transform 0.7s var(--ease);
  transition-delay: var(--d, 0ms);
}

.reveal.in {
  opacity: 1;
  transform: none;
}

@keyframes pulse-dot {
  0%,
  100% {
    box-shadow: 0 0 0 3px oklch(0.78 0.14 155 / 18%);
  }
  50% {
    box-shadow: 0 0 0 6px oklch(0.78 0.14 155 / 6%);
  }
}

@keyframes grow-y {
  from {
    transform: scaleY(0.05);
    opacity: 0.3;
  }
  to {
    transform: scaleY(1);
    opacity: 1;
  }
}

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

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .kpi-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .foot {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media (min-width: 1024px) {
  .page {
    padding: 0 2.5rem;
  }

  .nav-links {
    display: flex;
  }

  .hero {
    padding: 5rem 0 5.5rem;
  }

  .preview-body {
    grid-template-columns: 1.4fr 1fr;
    padding: 1.75rem;
  }

  .grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 2rem;
  }

  .band {
    padding: 6rem 0;
  }

  .closer {
    padding: 4.5rem 2rem;
  }
}