/* ライトは白地（2026-11-04、依頼）。メニューで自動・ライト・ダークを選べ、html の data-theme に入る */
:root {
  --paper: #ffffff;
  --ink: #1f1f1f;
  --dim: #6b6b6b;
  --line: #e4e4e4;
  --on: #1f1f1f;
  --on-ink: #ffffff;
  --gap: 96px;
  color-scheme: light;
  font-family: "IBM Plex Sans JP", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", system-ui, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #111111;
    --ink: #ebebeb;
    --dim: #9b9b9b;
    --line: #2e2e2e;
    --on: #ebebeb;
    --on-ink: #111111;
    --atomo-glow: 106 168 255;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #111111;
  --ink: #ebebeb;
  --dim: #9b9b9b;
  --line: #2e2e2e;
  --on: #ebebeb;
  --on-ink: #111111;
  --atomo-glow: 106 168 255;
  color-scheme: dark;
}
@media (prefers-contrast: more) {
  :root { --dim: var(--ink); }
}

* { box-sizing: border-box; }
html { background: var(--paper); color: var(--ink); }
body { margin: 0; font-size: 0.8125rem; line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: inherit; }

/* 上の帯。地の色を78%にしてぼかし、下の写真が透けて見える */
.bar {
  position: sticky; top: 0; z-index: 8;
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center;
  height: 56px; padding: 0 max(16px, env(safe-area-inset-left));
  background: color-mix(in srgb, var(--paper) 78%, transparent);
  -webkit-backdrop-filter: saturate(1.4) blur(18px); backdrop-filter: saturate(1.4) blur(18px);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 60%, transparent);
}
@media (prefers-reduced-transparency: reduce) {
  .bar { background: var(--paper); -webkit-backdrop-filter: none; backdrop-filter: none; }
}
.menu-btn {
  justify-self: start; display: inline-flex; align-items: center; gap: 8px;
  font: inherit; font-size: 0.875rem; color: var(--ink); background: none; border: 0;
  min-height: 44px; padding: 0 4px; cursor: pointer;
}
.menu-btn svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; }
.mark { display: block; line-height: 0; }
.mark img { display: block; width: 30px; height: 30px; border-radius: 50%; }
/* 黒い丸は暗い地にまぎれるので、ダークでは細い縁を付ける */
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .mark img { box-shadow: 0 0 0 1px #3a3a3a; } }
:root[data-theme="dark"] .mark img { box-shadow: 0 0 0 1px #3a3a3a; }
.mark:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; border-radius: 50%; }

/* メニュー。帯の下に全面で開き、項目を大きな字で縦に並べる */
.menu {
  position: fixed; inset: 56px 0 0; z-index: 7; overflow-y: auto;
  background: var(--paper); padding: 24px max(16px, env(safe-area-inset-left)) 48px;
}
.menu[hidden] { display: none; }
.feeds { display: flex; flex-direction: column; max-width: 640px; margin: 0 auto; }
.feeds button {
  display: flex; justify-content: space-between; align-items: center;
  font: inherit; font-size: 1.375rem; font-weight: 300; text-align: left; color: var(--ink);
  background: none; border: 0; border-bottom: 1px solid var(--line);
  min-height: 64px; padding: 0 2px; cursor: pointer;
}
.feeds button::after { content: "›"; color: var(--dim); font-size: 1.5rem; }
.feeds button[aria-pressed="true"]::after { content: "●"; font-size: 0.5rem; color: var(--ink); }
.feeds button[hidden] { display: none; }
.menu-sub { max-width: 640px; margin: 32px auto 0; color: var(--dim); font-size: 0.75rem; }
.menu-sub p { margin: 0 0 16px; }
.theme { display: flex; align-items: center; gap: 4px; margin: 0 0 24px; }
.theme .label { color: var(--dim); margin-right: 10px; }
.theme button {
  font: inherit; color: var(--dim); background: none; border: 1px solid var(--line); border-radius: 999px;
  min-height: 32px; padding: 2px 14px; cursor: pointer;
}
.theme button[aria-checked="true"] { color: var(--on-ink); background: var(--on); border-color: var(--on); }
.theme button:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }
.links { display: flex; flex-wrap: wrap; gap: 4px 18px; }

/* 見ているフィードの名前。ライカの特集の見出しにならって大きく、細く置く */
.hero { max-width: 672px; margin: 0 auto; padding: 64px 16px 56px; }
.hero h1 { margin: 0; font-size: clamp(2rem, 6vw, 3.25rem); font-weight: 300; line-height: 1.15; letter-spacing: 0.01em; }
.sub { margin: 14px 0 0; color: var(--dim); font-size: 0.875rem; }
.sub:empty { display: none; }

.feeds button:focus-visible, .menu-btn:focus-visible, .shot:focus-visible, .lightbox .close:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }

#stream { margin: 0 auto; }

/* 縦長・正方形・組み写真は 640px の内側、横長の1枚は画面の端まで（1600px まで） */
.post { margin: 0 auto var(--gap); }
.post.narrow { max-width: 672px; padding: 0 16px; }
.post.wide { max-width: 1600px; }
.post.wide .meta { padding: 0 16px; }
.photos { display: flex; flex-direction: column; gap: 6px; }
.post.pair .photos { flex-direction: row; }
.post.pair .frame { flex: 1; min-width: 0; }
.frame { position: relative; }
.shot { display: block; padding: 0; border: 0; background: var(--line); cursor: zoom-in; width: 100%; }
.shot img { display: block; width: 100%; height: auto; }
.post.wide .shot img { max-height: 92vh; object-fit: cover; }
.post.narrow .shot img { max-height: 88vh; object-fit: contain; background: var(--paper); }

/* ライカの「© 名前」と同じ、写真の右下の小さな札 */
.credit {
  position: absolute; right: 12px; bottom: 12px; max-width: calc(100% - 24px);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  font-size: 0.6875rem; line-height: 1; color: #2b2b2b; background: rgb(255 255 255 / 0.88);
  padding: 6px 9px; border-radius: 4px; text-decoration: none;
}
.credit:hover { background: #fff; }
.credit:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }
.meta {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  margin-top: 12px; color: var(--dim); font-size: 0.75rem;
}
.who { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.who a { text-decoration: none; }
.who a:hover { text-decoration: underline; }
.counts { display: flex; align-items: center; gap: 14px; flex-shrink: 0; font-variant-numeric: tabular-nums; }
.act {
  font: inherit; color: var(--dim); background: none; border: 0; cursor: pointer;
  display: inline-flex; align-items: center; gap: 4px; min-height: 28px; padding: 0 2px;
}
.act svg { width: 13px; height: 13px; }
.act[aria-pressed="true"] { color: var(--ink); }
.act.like[aria-pressed="true"] svg { fill: currentColor; }
.act.bookmark[aria-pressed="true"] svg { fill: currentColor; }
.feeds button[hidden] { display: none; }
.act:disabled { cursor: progress; }
.act:focus-visible, .mute:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }

.right { justify-self: end; display: flex; align-items: center; gap: 4px; }
.search-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; color: var(--ink); background: none; border: 0; cursor: pointer;
}
.search-btn svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; }
.search-btn:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }

/* 撮った人で探す */
.search-box { max-width: 640px; margin: 0 auto; }
.search-box input {
  width: 100%; font: inherit; font-size: 1.375rem; font-weight: 300; color: var(--ink);
  background: none; border: 0; border-bottom: 1px solid var(--ink); border-radius: 0;
  padding: 10px 2px; outline: none; -webkit-appearance: none; appearance: none;
}
.search-box input::placeholder { color: var(--dim); }
.search-note { max-width: 640px; margin: 18px auto 6px; color: var(--dim); font-size: 0.75rem; }
.search-note:empty { display: none; }
.people { list-style: none; max-width: 640px; margin: 0 auto; padding: 0; }
.people button {
  display: flex; align-items: center; gap: 14px; width: 100%; text-align: left;
  font: inherit; color: var(--ink); background: none; border: 0; border-bottom: 1px solid var(--line);
  min-height: 64px; padding: 8px 2px; cursor: pointer;
}
.people button:focus-visible { outline: 2px solid var(--ink); outline-offset: -2px; }
.people img, .people .blank { width: 40px; height: 40px; border-radius: 50%; object-fit: cover; flex: none; background: var(--line); }
.people .name { display: block; font-size: 1rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.people .handle { display: block; color: var(--dim); font-size: 0.75rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.people .count { margin-left: auto; color: var(--dim); font-size: 0.75rem; flex: none; }
.people .who { min-width: 0; }
.people .group { color: var(--dim); font-size: 0.75rem; padding: 20px 2px 6px; }
.from:empty { display: none; }
/* 出典の丸。写真部は藍、どうでもいい写真部は芥子、植物園は若草。明るい地でも暗い地でも見分けられる濃さにした */
.from { display: inline-flex; flex-wrap: wrap; gap: 4px 14px; }
.src { display: inline-flex; align-items: center; gap: 7px; }
.dot { width: 8px; height: 8px; border-radius: 50%; flex: none; }
.dot.photo { background: #3b6fd4; }
.dot.whatever { background: #e0a43a; }
.dot.botanical { background: #4fa865; }

/* 帯の右。ログイン前は光の輪と「ATOMO でログイン」、ログイン後は輪の中に自分のアイコン */
.account { position: relative; display: flex; align-items: center; }
.account > button {
  font: inherit; font-size: 0.8125rem; color: var(--ink); background: none; border: 0;
  min-height: 44px; min-width: 44px; padding: 0 4px; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: flex-end; gap: 8px;
}
@media (max-width: 560px) { .account .login span { display: none; } }
.who-pop {
  position: absolute; top: calc(100% + 4px); right: 0; min-width: 200px;
  background: var(--paper); border: 1px solid var(--line); border-radius: 10px;
  box-shadow: 0 8px 24px rgb(0 0 0 / 0.12); padding: 12px 14px; font-size: 0.8125rem;
}
.who-pop[hidden] { display: none; }
.who-pop .me { margin: 0 0 8px; color: var(--dim); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.who-pop button { font: inherit; color: var(--ink); background: none; border: 0; padding: 4px 0; min-height: 32px; cursor: pointer; text-decoration: underline; }

dialog.signin {
  width: min(400px, calc(100vw - 32px)); border: 1px solid var(--line); border-radius: 12px;
  padding: 24px; background: var(--paper); color: var(--ink);
}
dialog.signin::backdrop { background: rgb(0 0 0 / 0.25); }
dialog.signin form { display: grid; gap: 12px; }
dialog.signin h2 { font-size: 1rem; font-weight: 500; margin: 0; }
dialog.signin .note { margin: 0; color: var(--dim); font-size: 0.75rem; }
dialog.signin .row { display: flex; align-items: center; gap: 6px; }
dialog.signin .at { color: var(--dim); }
dialog.signin input {
  flex: 1; font: inherit; font-size: 1rem; color: var(--ink); background: transparent;
  border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; min-height: 40px;
}
dialog.signin .primary {
  font: inherit; color: var(--on-ink); background: var(--on); border: 0; border-radius: 999px;
  min-height: 40px; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; gap: 8px;
}
dialog.signin .primary:disabled { opacity: 0.7; cursor: progress; }
dialog.signin .err { margin: 0; color: #b4302a; font-size: 0.75rem; }
dialog.signin .err:empty { display: none; }
dialog.signin .cancel { justify-self: center; font: inherit; color: var(--dim); background: none; border: 0; text-decoration: underline; cursor: pointer; padding: 6px; }

.mute {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; margin: 0 -8px 0 -4px; padding: 0;
  color: var(--dim); background: none; border: 0; cursor: pointer; opacity: 0.6;
}
.mute:hover, .mute:focus-visible { opacity: 1; }
.mute svg { width: 14px; height: 14px; }

.muted[hidden] { display: none; }
.muted button, .toast button {
  font: inherit; color: inherit; background: none; border: 0; padding: 4px 6px;
  text-decoration: underline; cursor: pointer;
}
.toast {
  position: fixed; left: 50%; bottom: max(24px, env(safe-area-inset-bottom)); transform: translateX(-50%); z-index: 5;
  background: var(--on); color: var(--on-ink); border-radius: 999px;
  padding: 6px 10px 6px 18px; font-size: 0.75rem; white-space: nowrap;
}
.toast[hidden] { display: none; }

.state { text-align: center; color: var(--dim); margin: 0 auto 64px; padding: 0 16px; max-width: 640px; }
.state button { font: inherit; color: var(--ink); background: none; border: 1px solid var(--line); border-radius: 999px; padding: 4px 14px; min-height: 32px; cursor: pointer; margin-top: 8px; }
#more { height: 1px; }

.foot { text-align: center; color: var(--dim); font-size: 0.6875rem; padding: 32px 16px 64px; }
.foot a { text-decoration: none; }

.lightbox {
  position: fixed; inset: 0; z-index: 10; background: var(--paper);
  display: flex; align-items: center; justify-content: center;
  /* 閉じる・矢印・「Bluesky で開く」は写真の外の余白に置き、写真と重ねない */
  padding: max(68px, env(safe-area-inset-top)) 76px max(56px, env(safe-area-inset-bottom));
  cursor: zoom-out;
}
.lightbox[hidden] { display: none; }
.lightbox img { max-width: 100%; max-height: 100%; object-fit: contain; }
.lightbox .close {
  position: absolute; top: max(12px, env(safe-area-inset-top)); right: 12px;
  width: 44px; height: 44px; font-size: 1.5rem; color: var(--dim);
  background: none; border: 0; cursor: pointer;
}
.lightbox .open {
  position: absolute; bottom: max(16px, env(safe-area-inset-bottom)); left: 50%; transform: translateX(-50%);
  color: var(--dim); font-size: 0.75rem; padding: 8px;
}
.toast button[hidden] { display: none; }
/* 前後の写真へ。ライカのギャラリーの丸い矢印にならう */
.lightbox .prev, .lightbox .next {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 44px; height: 44px; border-radius: 50%; border: 0; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--ink); background: color-mix(in srgb, var(--paper) 80%, transparent);
  box-shadow: 0 1px 6px rgb(0 0 0 / 0.12);
}
.lightbox .prev { left: max(12px, env(safe-area-inset-left)); }
.lightbox .next { right: max(12px, env(safe-area-inset-right)); }
.lightbox .prev svg, .lightbox .next svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.lightbox .prev:disabled, .lightbox .next:disabled { opacity: 0.3; cursor: default; }
.lightbox .prev:focus-visible, .lightbox .next:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }
/* 細い画面では左右の余白を取らず、矢印は下の両端へ移す */
@media (max-width: 600px) {
  .lightbox { padding: max(68px, env(safe-area-inset-top)) 0 max(72px, env(safe-area-inset-bottom)); }
  .lightbox .prev, .lightbox .next { top: auto; transform: none; bottom: max(14px, env(safe-area-inset-bottom)); box-shadow: none; }
}

@media (prefers-reduced-motion: no-preference) {
  .post { animation: rise 0.6s ease both; }
  @keyframes rise { from { opacity: 0; transform: translateY(8px); } }
}