/* 壁纸站主题：纯黑画廊。
   只有透明度和位移两种过渡，不做阴影、不做渐变色块——画面里唯一有颜色的东西是壁纸本身。 */

:root {
  --bg: #000;
  --surface: #0c0c0e;
  --surface-2: #141417;
  --line: rgba(255, 255, 255, .1);
  --line-strong: rgba(255, 255, 255, .28);
  --fg: #f5f5f7;
  --fg-2: #a1a1a6;
  --fg-3: #6e6e73;
  --danger: #ff6b6b;
  --ok: #4ade80;

  --ease: cubic-bezier(.16, 1, .3, 1);
  --pad: clamp(20px, 5vw, 56px);
  --radius: 18px;

  color-scheme: dark;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC",
               "Helvetica Neue", "Microsoft YaHei", sans-serif;
  font-weight: 400;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: anywhere;
}

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

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

::selection { background: rgba(255, 255, 255, .18); }

/* ---------- 顶栏 ---------- */

.top {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px var(--pad);
  background: rgba(0, 0, 0, .62);
  backdrop-filter: saturate(160%) blur(20px);
  -webkit-backdrop-filter: saturate(160%) blur(20px);
  border-bottom: 1px solid var(--line);
}

.top .brand {
  font-size: 15px;
  letter-spacing: .12em;
  font-weight: 500;
  text-transform: uppercase;
}

.top nav {
  display: flex;
  gap: 22px;
  font-size: 14px;
  color: var(--fg-2);
}

.top nav a { transition: color .25s var(--ease); }
.top nav a:hover, .top nav a[aria-current] { color: var(--fg); }

/* ---------- 通用排版 ---------- */

.wrap { padding: 0 var(--pad); }
.wrap-narrow { max-width: 620px; margin: 0 auto; padding: 0 var(--pad); }

.hero {
  padding: clamp(64px, 14vh, 148px) var(--pad) clamp(40px, 8vh, 84px);
  max-width: 900px;
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(34px, 6.4vw, 68px);
  font-weight: 300;
  letter-spacing: -.02em;
  line-height: 1.08;
}

.hero p {
  margin: 0;
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 18px);
  color: var(--fg-2);
  font-weight: 300;
}

h2 {
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 400;
  letter-spacing: -.01em;
  margin: 0 0 14px;
}

.muted { color: var(--fg-2); }
.dim { color: var(--fg-3); }
.tiny { font-size: 13px; }
.center { text-align: center; }

/* ---------- 瀑布流 ---------- */

.gallery {
  columns: 2;
  column-gap: 14px;
  padding: 0 var(--pad) clamp(60px, 12vh, 140px);
}

@media (min-width: 760px)  { .gallery { columns: 3; column-gap: 18px; } }
@media (min-width: 1280px) { .gallery { columns: 4; column-gap: 20px; } }

.card {
  /* 是个 <button>，UA 默认的边框和内边距要显式清掉，否则每张图外面挂一圈亮边 */
  border: 0;
  padding: 0;
  font: inherit;
  color: inherit;
  text-align: left;
  display: block;
  width: 100%;

  break-inside: avoid;
  margin-bottom: 14px;
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
  cursor: pointer;
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}

.card:focus-visible { outline: 2px solid var(--fg); outline-offset: 2px; }

@media (min-width: 760px) { .card { margin-bottom: 18px; } }

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

.card img {
  width: 100%;
  height: auto;
  transition: transform .8s var(--ease), opacity .5s var(--ease);
}

.card:hover img { transform: scale(1.035); }

.card .meta {
  position: absolute;
  inset: auto 0 0 0;
  padding: 44px 16px 14px;
  background: linear-gradient(to top, rgba(0, 0, 0, .78), transparent);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
  opacity: 0;
  transition: opacity .35s var(--ease);
}

.card:hover .meta, .card:focus-visible .meta { opacity: 1; }

/* 触屏没有 hover，标题常驻 */
@media (hover: none) { .card .meta { opacity: 1; } }

.card .meta strong { font-weight: 400; font-size: 15px; }
.card .meta span { font-size: 13px; color: var(--fg-2); white-space: nowrap; }
/* 免费的那几张，价格位置比标价更亮一点，在瀑布流里一眼能扫到 */
.card .meta span.free { color: var(--fg); }

/* ---------- 按钮 ---------- */

.btn {
  appearance: none;
  border: 0;
  border-radius: 999px;
  padding: 13px 26px;
  font: inherit;
  font-size: 15px;
  background: var(--fg);
  color: #000;
  cursor: pointer;
  transition: opacity .25s var(--ease), transform .25s var(--ease);
}

.btn:hover { opacity: .86; }
.btn:active { transform: scale(.975); }
.btn[disabled] { opacity: .35; cursor: not-allowed; transform: none; }

.btn.ghost {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--line-strong);
}

.btn.ghost:hover { background: rgba(255, 255, 255, .07); opacity: 1; }

.btn.block { display: block; width: 100%; }

/* ---------- 表单 ---------- */

.field { margin: 0 0 16px; }

.field label {
  display: block;
  font-size: 13px;
  color: var(--fg-2);
  margin-bottom: 7px;
}

input[type=text], input[type=tel], input[type=number], input[type=password], textarea, select {
  width: 100%;
  padding: 13px 15px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--surface-2);
  color: var(--fg);
  font: inherit;
  font-size: 16px;   /* 小于 16px iOS 会在聚焦时放大整页 */
  transition: border-color .25s var(--ease);
}

input:focus, textarea:focus, select:focus { outline: none; border-color: var(--line-strong); }

input::placeholder, textarea::placeholder { color: var(--fg-3); }

.mono {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  letter-spacing: .02em;
}

/* ---------- 弹层 ---------- */

.sheet {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
  background: rgba(0, 0, 0, .86);
  backdrop-filter: blur(28px);
  -webkit-backdrop-filter: blur(28px);
}

.sheet.open { display: flex; flex-direction: column; }

.sheet-close {
  position: absolute;
  top: 14px;
  right: 16px;
  z-index: 2;
  width: 38px;
  height: 38px;
  border-radius: 999px;
  border: 0;
  background: rgba(255, 255, 255, .12);
  color: var(--fg);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
}

.sheet-body {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 22px;
  padding: 58px 20px 24px;
  animation: rise .5s var(--ease);
}

@keyframes rise {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: none; }
}

.sheet-body img.shot {
  max-width: min(100%, 560px);
  max-height: 62vh;
  width: auto;
  border-radius: 14px;
  object-fit: contain;
}

.sheet-foot {
  width: 100%;
  max-width: 460px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* ---------- 二维码 ---------- */

.qr {
  width: 232px;
  height: 232px;
  padding: 14px;
  border-radius: 16px;
  background: #fff;
  display: grid;
  place-items: center;
}

.qr canvas, .qr img { width: 100%; height: 100%; }

.pay-state {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 14px;
  color: var(--fg-2);
}

.dot {
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--fg-3);
  animation: pulse 1.6s ease-in-out infinite;
}

.dot.ok { background: var(--ok); animation: none; }
.dot.bad { background: var(--danger); animation: none; }

@keyframes pulse { 0%, 100% { opacity: .3; } 50% { opacity: 1; } }

/* ---------- 卡片区块 ---------- */

.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: clamp(20px, 4vw, 30px);
  margin: 0 0 18px;
}

.panel h3 { margin: 0 0 4px; font-size: 17px; font-weight: 500; }

.row {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}

.row:last-child { border-bottom: 0; }
.row span:first-child { color: var(--fg-2); flex: none; }
.row span:last-child { text-align: right; }

.code-box {
  margin: 12px 0;
  padding: 15px;
  border-radius: 12px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
  line-height: 1.65;
  word-break: break-all;
  user-select: all;
}

.note {
  font-size: 13px;
  color: var(--fg-3);
  line-height: 1.7;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  transform: translate(-50%, 20px);
  z-index: 300;
  padding: 12px 20px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .95);
  color: #000;
  font-size: 14px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s var(--ease), transform .3s var(--ease);
}

.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- 页脚 ---------- */

.foot {
  padding: 40px var(--pad) 56px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  font-size: 13px;
  color: var(--fg-3);
}

.foot a { transition: color .25s var(--ease); }
.foot a:hover { color: var(--fg-2); }

/* ---------- 空态 / 加载 ---------- */

.empty {
  padding: clamp(60px, 16vh, 160px) var(--pad);
  text-align: center;
  color: var(--fg-3);
  font-weight: 300;
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .card { opacity: 1; transform: none; }
}