/* 阶梯式五档 · A 方案专属样式 */
.tier-picker-stair {
  position: relative;
  background: linear-gradient(180deg, #e0ebe6 0%, #d4e0db 100%);
  border-top: 1px solid #c5d3cc;
  border-bottom: 1px solid #c5d3cc;
  overflow: hidden;
  padding: 48px 0 64px;
  margin-left: calc((100vw - 100%) / -2);
  margin-right: calc((100vw - 100%) / -2);
  padding-left: calc((100vw - 100%) / 2);
  padding-right: calc((100vw - 100%) / 2);
}
.tier-picker-stair::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 200px;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(217,177,102,0.08) 0%, transparent 70%);
  pointer-events: none;
}
.stair-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
  align-items: stretch;
  padding-top: 4px;
  position: relative;
  z-index: 1;
}
.stair-card {
  position: relative;
  background: #fff;
  border: 1px solid var(--line-steel);
  border-radius: var(--r-l);
  padding: 28px 22px 24px;
  box-shadow: 0 1px 2px rgba(18,58,95,.08), 0 6px 18px rgba(18,58,95,.10);
  cursor: pointer;
  transition: transform .25s ease, box-shadow .25s ease, border-color .2s ease;
  display: flex;
  flex-direction: column;
}
.stair-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 10px rgba(18,58,95,.12), 0 18px 40px rgba(18,58,95,.18);
  border-color: var(--navy-400);
}
.stair-card > * { position: relative; }
.stair-deco {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 120px;
  background-size: cover;
  background-position: center;
  opacity: 0.18;
  border-radius: var(--r-l) var(--r-l) 0 0;
  pointer-events: none;
}

/* 阶梯高度差 —— 所有卡片底部齐平，内容顶部形成阶梯
   s0 内容最低 = 视觉上最矮，s2 内容最高 = 视觉上最高，s4 略回落 */
.stair-card { height: 100%; }
.stair-s0 { padding-top: 96px; }
.stair-s1 { padding-top: 64px; }
.stair-s2 { padding-top: 24px; }
.stair-s3 { padding-top: 56px; }
.stair-s4 { padding-top: 44px; }

.tier-position {
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted-500);
  margin: 4px 0 8px;
  font-weight: 400;
}
.stair-s4 .tier-position {
  color: rgba(255,255,255,0.75) !important;
}
.stair-featured .tier-position {
  color: var(--ink-500);
}

/* 色阶：从浅到深、从金到绿渐进
   P0：深色照片卡（.stair-photo 独立处理）
   P1：温馨米色（入门轻量服务）
   P2：极浅薄荷（主推档）
   P3：清新薄荷（进阶档）
   P4：金色顶配（强调画龙点） */
.stair-s0 {
  background: linear-gradient(180deg, #fdf6e8 0%, #fff 60%);
  border-color: rgba(217,177,102,0.35);
}
.stair-s1 {
  background: linear-gradient(180deg, #fdf9f3 0%, #faf5ec 100%);
  border-color: rgba(217,177,102,0.2);
}
.stair-s2 {
  background: linear-gradient(180deg, #fbfefd 0%, #eef7f4 100%);
  border-color: rgba(26,128,114,0.2);
}
.stair-s3 {
  background: linear-gradient(180deg, #eef7f4 0%, #dceee9 100%);
  border-color: rgba(26,128,114,0.3);
}
.stair-s4 {
  background: linear-gradient(180deg, #fff8ee 0%, #fff3e0 55%, #fff7ea 100%);
  border: 2px solid var(--gold-500);
  border-top: 6px solid var(--gold-500);
  color: inherit;
  box-shadow: 0 4px 14px rgba(217,177,102,0.2), 0 18px 44px rgba(217,177,102,0.25);
}
.stair-s4 .tier-name,
.stair-s4 .tier-meta li,
.stair-s4 .tier-deliver li,
.stair-s4 .tier-fit {
  color: inherit;
}
.stair-s4 .tier-price { color: var(--gold-700) !important; }
.stair-s4 .tier-price .unit { color: var(--muted-400); }
.stair-s4 .tier-code { color: var(--gold-700) !important; }
.stair-s4 .tier-split { border-color: rgba(217,177,102,0.25); }
.stair-s4 .tier-deliver li::before { background: #d9b166 !important; }
.stair-s4 .tier-fit b { color: var(--gold-700) !important; }
.stair-s4 .tier-more { color: var(--gold-700) !important; }
.stair-s4 .tier-ico { color: var(--gold-700) !important; }

/* 深色高冲击卡（P0 入口档）—— 墨绿背景 + 暖金光晕 + 玻璃波态信息层 */
.stair-card.stair-photo {
  /* 档位主题变量：每档只需覆写这几个值 */
  --ph-bg: #452a20;
  --ph-grad-a: #633c2b;
  --ph-grad-b: #331e17;
  --ph-glow: rgba(255,214,168,0.36);
  --ph-accent: #ffe8c8;
  --ph-accent-2: #f6c79b;
  --ph-accent-3: #e0a071;
  --ph-accent-ink: #3a1c11;
  --ph-shadow: 66,38,26;
  padding: 0;
  overflow: visible;
  background: var(--ph-bg);
  border: 1px solid transparent;
  border-radius: var(--r-l);
  box-shadow:
    0 4px 14px rgba(var(--ph-shadow),0.45),
    0 24px 56px rgba(var(--ph-shadow),0.55);
  position: relative;
  color: #fff;
  isolation: isolate;
}
.stair-card.stair-photo::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1.5px;
  background: linear-gradient(155deg,
    var(--ph-accent) 0%,
    var(--ph-accent-2) 25%,
    var(--ph-accent-3) 50%,
    color-mix(in oklab, var(--ph-accent-3) 55%, transparent) 75%,
    color-mix(in oklab, var(--ph-accent-3) 50%, transparent) 100%);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  z-index: 3;
}
.stair-card.stair-photo:hover {
  transform: translateY(-6px);
  box-shadow:
    0 8px 20px rgba(var(--ph-shadow),0.55),
    0 36px 72px rgba(var(--ph-shadow),0.6),
    0 0 40px color-mix(in oklab, var(--ph-accent) 18%, transparent);
}
.stair-card.stair-photo:hover::before {
  background: linear-gradient(155deg,
    color-mix(in oklab, var(--ph-accent) 70%, #fff) 0%,
    var(--ph-accent) 25%,
    var(--ph-accent-2) 50%,
    color-mix(in oklab, var(--ph-accent-3) 70%, transparent) 75%,
    color-mix(in oklab, var(--ph-accent-3) 60%, transparent) 100%);
}
.stair-card.stair-photo .stair-deco,
.stair-card.stair-photo .stair-step-badge,
.stair-card.stair-photo .stair-entry-flag {
  display: none;
}

/* 填充背景 */
.stair-card.stair-photo::after {
  content: "";
  position: absolute;
  inset: 1px;
  border-radius: calc(var(--r-l) - 1px);
  background:
    radial-gradient(ellipse 80% 40% at 30% 0%, var(--ph-glow) 0%, transparent 60%),
    linear-gradient(160deg, var(--ph-grad-a) 0%, var(--ph-grad-b) 100%);
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}
/* 顶部高光扫线 */
.stair-photo-sheen {
  position: absolute;
  top: 1px; left: 1px; right: 1px;
  height: 40%;
  background: linear-gradient(180deg, rgba(255,255,255,0.1) 0%, transparent 100%);
  pointer-events: none;
  z-index: 2;
  border-radius: calc(var(--r-l) - 1px) calc(var(--r-l) - 1px) 0 0;
}
/* 角光效果 */
.stair-photo-corner {
  position: absolute;
  width: 60px; height: 60px;
  pointer-events: none;
  z-index: 2;
}
.stair-photo-corner.tl {
  top: 10px; left: 10px;
  border-top: 1.5px solid color-mix(in oklab, var(--ph-accent) 70%, transparent);
  border-left: 1.5px solid color-mix(in oklab, var(--ph-accent) 70%, transparent);
  border-radius: calc(var(--r-l) - 6px) 0 0 0;
}
.stair-photo-corner.br {
  bottom: 10px; right: 10px;
  border-bottom: 1.5px solid color-mix(in oklab, var(--ph-accent) 45%, transparent);
  border-right: 1.5px solid color-mix(in oklab, var(--ph-accent) 45%, transparent);
  border-radius: 0 0 calc(var(--r-l) - 6px) 0;
}

.stair-photo-media {
  position: relative;
  z-index: 3;
  flex: none;
  overflow: hidden;
}
.stair-photo-img {
  display: block;
  width: 100%;
  height: 156px;
  object-fit: cover;
  object-position: center 30%;
  opacity: 0.5;
  border-radius: calc(var(--r-l) - 1px) calc(var(--r-l) - 1px) 0 0;
  -webkit-mask-image: linear-gradient(180deg,
    #000 0%,
    #000 38%,
    rgba(0,0,0,0.72) 60%,
    rgba(0,0,0,0.34) 78%,
    rgba(0,0,0,0.10) 92%,
    transparent 100%);
  mask-image: linear-gradient(180deg,
    #000 0%,
    #000 38%,
    rgba(0,0,0,0.72) 60%,
    rgba(0,0,0,0.34) 78%,
    rgba(0,0,0,0.10) 92%,
    transparent 100%);
}
.stair-photo-media .stair-photo-flag {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 4;
}
.stair-photo-media .stair-photo-step {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 4;
  color: rgba(255,255,255,0.9);
  text-shadow: 0 1px 3px rgba(0,0,0,0.65);
}
.stair-photo-flag {
  display: inline-flex;
  align-items: center;
  padding: 5px 13px;
  border-radius: var(--r-full);
  background: linear-gradient(135deg, var(--ph-accent) 0%, var(--ph-accent-3) 100%);
  color: var(--ph-accent-ink);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  box-shadow:
    0 3px 10px color-mix(in oklab, var(--ph-accent-3) 45%, transparent),
    inset 0 1px 0 rgba(255,255,255,0.5),
    inset 0 -1px 0 rgba(0,0,0,0.1);
}
.stair-photo-step {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: rgba(255,255,255,0.75);
  letter-spacing: 0.14em;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.stair-photo-step::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--ph-accent);
  box-shadow: 0 0 10px color-mix(in oklab, var(--ph-accent) 80%, transparent), 0 0 20px color-mix(in oklab, var(--ph-accent) 40%, transparent);
}

/* 大号价格展示区域 */
.stair-photo-hero {
  position: relative;
  z-index: 3;
  margin-top: -34px;
  padding: 0 22px 20px;
  text-align: center;
}
.stair-photo-hero .big-price {
  font-size: 60px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  background: linear-gradient(180deg, #ffffff 0%, color-mix(in oklab, var(--ph-accent) 70%, #fff) 45%, var(--ph-accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  font-family: var(--font-mono);
  -webkit-font-smoothing: antialiased;
}
.stair-photo-hero .big-price .yuan {
  font-size: 22px;
  font-weight: 600;
  -webkit-text-fill-color: color-mix(in oklab, var(--ph-accent) 70%, #fff);
  margin-right: 2px;
  vertical-align: 16px;
  filter: none;
}
.stair-photo-hero .big-sub {
  margin-top: 8px;
  font-size: 14px;
  color: rgba(255,255,255,0.88);
  font-weight: 500;
  letter-spacing: 0.02em;
}
.stair-photo-hero .big-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  padding: 9px 22px;
  border-radius: var(--r-full);
  background: linear-gradient(135deg, var(--ph-accent) 0%, var(--ph-accent-3) 100%);
  color: var(--ph-accent-ink);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  box-shadow:
    0 4px 14px color-mix(in oklab, var(--ph-accent-3) 40%, transparent),
    inset 0 1px 0 rgba(255,255,255,0.5),
    inset 0 -1px 0 rgba(0,0,0,0.1);
  transition: transform .2s ease, box-shadow .2s ease;
}
.stair-card.stair-photo:hover .big-cta {
  transform: scale(1.04);
  box-shadow:
    0 6px 18px color-mix(in oklab, var(--ph-accent-3) 55%, transparent),
    inset 0 1px 0 rgba(255,255,255,0.6),
    inset 0 -1px 0 rgba(0,0,0,0.1);
}

/* 玻璃波态信息层 */
.stair-photo-body {
  position: relative;
  z-index: 3;
  margin: 0 14px 14px;
  padding: 18px 18px 20px;
  border-radius: calc(var(--r-l) - 6px);
  background:
    linear-gradient(160deg,
      color-mix(in oklab, var(--ph-grad-a) 82%, #000) 0%,
      color-mix(in oklab, var(--ph-bg) 88%, #000) 100%);
  border: 1px solid rgba(255,255,255,0.16);
  box-shadow:
    0 10px 30px rgba(0,0,0,0.25),
    inset 0 1px 0 rgba(255,255,255,0.18);
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  color: #fff;
}
.stair-photo-body .tier-code-row { display: none; }
.stair-photo-body .tier-name {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin: 0 0 6px;
  line-height: 1.4;
}
.stair-photo-body .tier-position {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(255,255,255,0.86);
  margin: 0 0 12px;
}
.stair-photo-body .tier-price { display: none; }
.stair-photo-body .tier-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 12px;
  padding: 0;
  list-style: none;
}
.stair-photo-body .tier-meta li {
  flex: 1 1 40%;
  min-width: 0;
  padding: 7px 10px;
  border-radius: var(--r-s);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.08);
  font-size: 12px;
  color: rgba(255,255,255,0.78);
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.stair-photo-body .tier-meta li b {
  font-size: 13px;
  color: var(--ph-accent);
  font-weight: 700;
  font-family: var(--font-mono);
  text-align: left;
}
.stair-photo-body .tier-deliver {
  margin: 0 0 10px;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.stair-photo-body .tier-deliver li {
  position: relative;
  padding-left: 20px;
  font-size: 13px;
  color: rgba(255,255,255,0.95);
  line-height: 1.55;
}
.stair-photo-body .tier-deliver li::before {
  content: "";
  position: absolute;
  left: 2px; top: 7px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--ph-accent) 0%, transparent 70%);
  box-shadow: 0 0 8px color-mix(in oklab, var(--ph-accent) 70%, transparent);
}
.stair-photo-body .tier-split {
  border: none;
  border-top: 1px solid rgba(255,255,255,0.1);
  margin: 10px 0;
}
.stair-photo-body .tier-fit {
  font-size: 13px;
  color: rgba(255,255,255,0.92);
  line-height: 1.55;
  margin: 0 0 10px;
}
.stair-photo-body .tier-fit b { color: var(--ph-accent); font-weight: 600; }
.stair-photo-body .tier-more {
  margin-top: auto;
  padding-top: 6px;
  color: var(--ph-accent);
  font-size: 12.5px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.stair-photo-body .tier-more::after {
  content: "→";
  transition: transform .2s ease;
}
.stair-card.stair-photo:hover .tier-more::after {
  transform: translateX(3px);
}

/* 主推卡 P2 灯塔效果 */

/* ===== 五档照片版主题色 —— 全部深色底，无白色卡面 =====
   P0 墨绿+暖金（入口档） / P1 深石青+淡金
   P2 深薄荷绿+青绿光（主推） / P3 深松绿+清绿光
   P4 墨棕+金（顶配） */
.stair-card.stair-photo.stair-s1 {
  --ph-bg: #1a2c42;
  --ph-grad-a: #26425e;
  --ph-grad-b: #131f2f;
  --ph-glow: rgba(206,228,246,0.22);
  --ph-accent: #e0eaf6;
  --ph-accent-2: #bdd5ea;
  --ph-accent-3: #93b6d4;
  --ph-accent-ink: #102234;
  --ph-shadow: 20,40,58;
}
.stair-card.stair-photo.stair-s2 {
  --ph-bg: #0b332f;
  --ph-grad-a: #135049;
  --ph-grad-b: #082b28;
  --ph-glow: rgba(18,179,156,0.30);
  --ph-accent: #7fe8d2;
  --ph-accent-2: #3fd0b6;
  --ph-accent-3: #12b39c;
  --ph-accent-ink: #04302a;
  --ph-shadow: 8,58,52;
}
.stair-card.stair-photo.stair-s3 {
  --ph-bg: #0d2b31;
  --ph-grad-a: #12414a;
  --ph-grad-b: #0a2429;
  --ph-glow: rgba(147,211,196,0.24);
  --ph-accent: #a9e2dd;
  --ph-accent-2: #7ecdc8;
  --ph-accent-3: #4ea9a6;
  --ph-accent-ink: #082a2e;
  --ph-shadow: 10,38,42;
}
.stair-card.stair-photo.stair-s4 {
  --ph-bg: #22201c;
  --ph-grad-a: #37302a;
  --ph-grad-b: #1a1815;
  --ph-glow: rgba(247,224,189,0.30);
  --ph-accent: #f3ddc0;
  --ph-accent-2: #e5c39c;
  --ph-accent-3: #c48e7a;
  --ph-accent-ink: #2b1d13;
  --ph-shadow: 34,28,22;
}

/* 照片版重置：盖掉浅色底 / 阶梯内边距的旧规则 */
.stair-card.stair-photo.stair-s0,
.stair-card.stair-photo.stair-s1,
.stair-card.stair-photo.stair-s2,
.stair-card.stair-photo.stair-s3,
.stair-card.stair-photo.stair-s4 {
  padding: 0;
  background: var(--ph-bg);
  border: 1px solid transparent;
}
.stair-card.stair-photo.stair-s4 { border-top: 1px solid transparent; }
.stair-card.stair-photo .tier-name,
.stair-card.stair-photo .tier-fit { color: inherit; }
.stair-card.stair-photo.stair-s4 .tier-position {
  color: rgba(255,255,255,0.72) !important;
}

/* 主推档：照片版下的缎带与光晕 */
.stair-card.stair-photo.stair-featured {
  border: 1px solid transparent;
  transform: translateY(-4px);
  will-change: auto;
  z-index: 2;
  box-shadow:
    0 6px 20px rgba(var(--ph-shadow),0.5),
    0 28px 64px rgba(var(--ph-shadow),0.6),
    0 0 0 4px rgba(18,179,156,0.14);
}
.stair-card.stair-photo.stair-featured:hover { transform: translateY(-8px); }
.stair-card.stair-photo .stair-ribbon {
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%) translateY(-100%);
  background: linear-gradient(135deg, var(--ph-accent-2) 0%, var(--ph-accent-3) 100%);
  color: var(--ph-accent-ink);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 6px 16px 8px;
  border-radius: 8px 8px 0 0;
  white-space: nowrap;
  z-index: 4;
  pointer-events: none;
}
.stair-card.stair-photo .stair-ribbon::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 50%;
  transform: translateX(-50%);
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 6px solid var(--ph-accent-3);
}

/* 照片版：继承标签 / 早鸟价 */
.stair-photo-body .stair-inherit {
  display: inline-block;
  align-self: flex-start;
  margin: 0 0 10px;
  padding: 3px 10px;
  border-radius: var(--r-full);
  background: color-mix(in oklab, var(--ph-accent) 16%, transparent);
  border: 1px solid color-mix(in oklab, var(--ph-accent) 28%, transparent);
  color: var(--ph-accent);
  font-size: 11.5px;
  font-weight: 600;
}
.stair-photo-hero .stair-early {
  margin: 8px 0 0;
  font-size: 11.5px;
  font-weight: 500;
  color: color-mix(in oklab, var(--ph-accent) 80%, #fff);
}

.stair-card.stair-featured {
  border: 2px solid var(--teal-500);
  box-shadow:
    0 0 0 4px rgba(26,128,114,0.10),
    0 6px 20px rgba(26,128,114,0.18),
    0 20px 50px rgba(18,58,95,0.22);
  transform: translateY(-4px);
  z-index: 2;
}
.stair-card.stair-featured:hover {
  transform: translateY(-8px);
  box-shadow:
    0 0 0 4px rgba(26,128,114,0.14),
    0 10px 28px rgba(26,128,114,0.22),
    0 28px 60px rgba(18,58,95,0.28);
}
.stair-featured .stair-ribbon {
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%) translateY(-100%);
  background: var(--teal-500);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 6px 16px 8px;
  border-radius: 8px 8px 0 0;
  white-space: nowrap;
  z-index: 3;
  pointer-events: none;
}
.stair-featured .stair-ribbon::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 50%;
  transform: translateX(-50%);
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 6px solid var(--teal-600);
}

/* 阶梯顶部连线 */
.stair-connection {
  position: absolute;
  top: 40px;
  left: 8%;
  right: 8%;
  height: 2px;
  background: linear-gradient(90deg,
    var(--gold-400) 0%,
    var(--gold-300) 20%,
    var(--teal-300) 50%,
    var(--teal-500) 80%,
    var(--gold-500) 100%);
  opacity: 0.35;
  pointer-events: none;
  z-index: 0;
}
.stair-step-dot {
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--teal-500);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.stair-card.stair-featured .stair-step-dot {
  width: 16px;
  height: 16px;
  border-width: 3px;
  background: var(--teal-500);
  box-shadow: 0 0 0 4px rgba(26,128,114,0.18);
}

/* 价格字号逐级放大 */
.stair-s0 .tier-price { font-size: 26px; }
.stair-s1 .tier-price { font-size: 30px; }
.stair-s2 .tier-price { font-size: 36px; }
.stair-s3 .tier-price { font-size: 32px; }
.stair-s4 .tier-price { font-size: 38px; }

/* 阶梯编号徽章 */
.stair-step-badge {
  position: absolute;
  top: -14px;
  left: 22px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--teal-400);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  color: var(--teal-600);
  font-family: var(--mono);
  z-index: 2;
}
.stair-card.stair-featured .stair-step-badge {
  top: -16px;
  width: 32px;
  height: 32px;
  font-size: 13px;
  border-color: var(--teal-500);
  background: var(--teal-500);
  color: #fff;
}
.stair-s0 .stair-step-badge {
  border-color: var(--gold-500);
  color: var(--gold-700);
  background: #fff;
}
.stair-s4 .stair-step-badge {
  border-color: var(--gold-500);
  color: #fff;
  background: var(--gold-500);
}

/* 继承标签 */
.stair-inherit {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  color: var(--teal-600);
  background: rgba(26,128,114,0.08);
  padding: 3px 10px;
  border-radius: 999px;
  margin: 6px 0 2px;
}
.stair-s0 .stair-inherit { display: none; }
.stair-s1 .stair-inherit { display: none; }
.stair-s4 .stair-inherit {
  background: rgba(217,177,102,0.12);
  color: var(--gold-700);
}

/* 早鸟标签 */
.stair-early {
  font-size: 12px;
  color: var(--gold-600);
  margin: 2px 0 0;
  font-weight: 500;
}
.stair-s4 .stair-early { color: var(--gold-700); }

/* 入门标签 */
.stair-entry-flag {
  position: absolute;
  top: 14px;
  right: 14px;
  background: var(--gold-500);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  letter-spacing: 0.03em;
  z-index: 2;
}

/* 顶部阶梯标签栏 */
.stair-bg-shape {
  position: absolute;
  left: 0;
  right: 0;
  top: 50px;
  bottom: 60px;
  pointer-events: none;
  z-index: 0;
  opacity: 0.9;
}
.stair-header-bar {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 4px;
  position: relative;
  z-index: 1;
}
.stair-header-item {
  text-align: center;
  padding-top: 8px;
}
.stair-header-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--muted-500);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-family: var(--mono);
}
.stair-header-line {
  height: 3px;
  border-radius: 2px;
  margin-top: 8px;
  opacity: 0.6;
}
.stair-h0 .stair-header-line { background: var(--gold-500); width: 30%; margin-left: 0; }
.stair-h1 .stair-header-line { background: var(--navy-300); width: 45%; margin-left: 0; }
.stair-h2 .stair-header-line { background: var(--teal-500); width: 80%; margin: 8px auto 0; }
.stair-h3 .stair-header-line { background: var(--teal-600); width: 55%; margin-right: 0; margin-left: auto; }
.stair-h4 .stair-header-line { background: var(--gold-500); width: 40%; margin-right: 0; margin-left: auto; }

.stair-h2 .stair-header-label {
  color: var(--teal-600);
  font-size: 13px;
}

/* 底部文案区 */
.stair-gate {
  background: rgba(255,255,255,.92);
  border: 1px solid var(--line-steel);
  border-radius: var(--r-m);
  padding: 14px 18px;
  margin-top: 28px;
}
.stair-gate strong { font-weight: 700; color: var(--ink-800); }

/* 响应式 */
@media (max-width: 1100px) {
  .stair-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .stair-bg-shape {
  position: absolute;
  left: 0;
  right: 0;
  top: 50px;
  bottom: 60px;
  pointer-events: none;
  z-index: 0;
  opacity: 0.9;
}
.stair-header-bar { display: none; }
  .stair-connection { display: none; }
  .stair-s0, .stair-s1, .stair-s2, .stair-s3, .stair-s4 {
    padding-top: 28px;
    margin-bottom: 0;
  }
  .stair-card.stair-photo { padding-top: 0; }
  .stair-photo-img { height: 138px; }
  .stair-photo-hero { margin-top: -30px; }
  .stair-photo-hero .big-price { font-size: 56px; }
  .stair-photo-hero .big-price .yuan { font-size: 20px; vertical-align: 12px; }
  .stair-photo-body { margin: 0 10px 10px; padding: 14px 14px 16px; }
  .stair-s4 .tier-name,
  .stair-s4 .tier-price { color: inherit !important; }
  .stair-s4:not(.stair-photo) {
    background: linear-gradient(180deg, #fff 0%, #f3f9f8 100%);
    border-color: var(--line-steel);
    color: inherit;
  }
  .stair-s4:not(.stair-photo) .tier-code { color: var(--teal-600) !important; }
}
@media (max-width: 720px) {
  .stair-grid { grid-template-columns: 1fr; gap: 14px; }
  .stair-photo-img { height: 200px; }
  .stair-photo-hero { margin-top: -42px; }
  .stair-photo-hero .big-price { font-size: 72px; }
  .stair-photo-body { margin: 0 14px 14px; padding: 18px 18px 20px; }
  .stair-card.stair-featured,
  .stair-card.stair-photo.stair-featured { transform: none; }
  .stair-card.stair-featured:hover,
  .stair-card.stair-photo.stair-featured:hover { transform: translateY(-2px); }
  .stair-s0 .tier-price, .stair-s1 .tier-price,
  .stair-s2 .tier-price, .stair-s3 .tier-price,
  .stair-s4 .tier-price { font-size: 28px; }
}