/* ─────────────────────────────────────────────────────────────────
   birdclaw — design tokens
   Palette: Twitter blue, but on a deeper, slightly cool obsidian.
   ─────────────────────────────────────────────────────────────── */
:root {
  --bc-blue:        #1d9bf0;
  --bc-blue-hover:  #1a8cd8;
  --bc-blue-press:  #177cbf;
  --bc-blue-soft:   rgba(29,155,240,.10);
  --bc-blue-line:   rgba(29,155,240,.30);

  --bg:             #000000;
  --bg-elev:        #0b1418;
  --bg-elev-2:      #16202a;
  --bg-hover:       rgba(231,233,234,.03);
  --bg-press:       rgba(231,233,234,.06);

  --line:           rgb(47,51,54);
  --line-soft:      rgba(231,233,234,.10);

  --fg:             #e7e9ea;
  --fg-mute:        #71767b;
  --fg-quiet:       #536471;
  --fg-link:        var(--bc-blue);

  --red-like:       #f91880;
  --red-like-soft:  rgba(249,24,128,.10);
  --green-repost:   #00ba7c;
  --green-soft:     rgba(0,186,124,.10);

  --radius-sm: 4px;
  --radius:    14px;
  --radius-lg: 18px;
  --radius-pill: 9999px;

  --shadow-pop: 0 10px 30px rgba(0,0,0,.5), 0 2px 6px rgba(0,0,0,.4);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --rail-w: 275px;
  --feed-w: 600px;
  --aside-w: 350px;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.3125;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

::selection { background: var(--bc-blue); color: white; }

/* Hide native focus rings but keep keyboard-only focus visible. */
:focus { outline: none; }
:focus-visible { outline: 2px solid var(--bc-blue); outline-offset: 2px; border-radius: 4px; }

/* ─────────────────────────────────────────────────────────────────
   Layout
   ─────────────────────────────────────────────────────────────── */
.app {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr;
  justify-content: center;
}
.shell {
  display: grid;
  grid-template-columns: var(--rail-w) var(--feed-w) var(--aside-w);
  gap: 0;
  max-width: calc(var(--rail-w) + var(--feed-w) + var(--aside-w));
  margin: 0 auto;
  min-height: 100vh;
}

/* ── Left rail ─────────────────────────────────────────────────── */
.rail {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  padding: 6px 12px 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.rail-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  margin: 4px 0 6px;
  transition: background 120ms ease;
}
.rail-logo:hover { background: var(--bg-hover); }
.rail-logo img { width: 36px; height: 36px; border-radius: 50%; }
.rail-link {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 12px 18px 12px 14px;
  border-radius: var(--radius-pill);
  font-size: 20px;
  font-weight: 500;
  color: var(--fg);
  cursor: pointer;
  transition: background 120ms ease;
  user-select: none;
}
.rail-link:hover { background: var(--bg-hover); }
.rail-link.is-active { font-weight: 700; }
.rail-link svg { width: 26px; height: 26px; flex-shrink: 0; }

.rail-cta {
  display: block;
  background: var(--bc-blue);
  color: white;
  border: none;
  font-weight: 700;
  font-size: 17px;
  padding: 16px;
  border-radius: var(--radius-pill);
  margin: 16px 6px 0;
  cursor: pointer;
  transition: background 120ms ease;
}
.rail-cta:hover { background: var(--bc-blue-hover); }
.rail-cta:active { background: var(--bc-blue-press); }

.rail-spacer { flex: 1; }

.rail-user {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background 120ms ease;
  margin-top: 8px;
}
.rail-user:hover { background: var(--bg-hover); }
.rail-user-name { font-weight: 700; font-size: 14px; }
.rail-user-handle { color: var(--fg-mute); font-size: 14px; }
.rail-user-text { flex: 1; min-width: 0; }
.rail-user-text > div { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ── Feed (center column) ──────────────────────────────────────── */
.feed {
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
  min-height: 100vh;
  background: var(--bg);
}
.feed-head {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  background: rgba(0,0,0,.65);
  border-bottom: 1px solid var(--line);
}
.feed-head-title {
  padding: 14px 16px 4px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -.01em;
  display: flex;
  align-items: center;
  gap: 12px;
}
.feed-head-back {
  width: 34px; height: 34px;
  border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  border: none; background: transparent; color: var(--fg);
  cursor: pointer;
}
.feed-head-back:hover { background: var(--bg-hover); }
.feed-head-sub { font-size: 13px; color: var(--fg-mute); font-weight: 400; padding: 0 16px 8px; }

.feed-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.feed-tab {
  padding: 16px;
  text-align: center;
  cursor: pointer;
  color: var(--fg-mute);
  font-weight: 500;
  position: relative;
  transition: background 120ms ease, color 120ms ease;
  background: transparent;
  border: none;
  font-size: 15px;
}
.feed-tab:hover { background: var(--bg-hover); }
.feed-tab.is-active { color: var(--fg); font-weight: 700; }
.feed-tab.is-active::after {
  content: '';
  position: absolute;
  left: 50%; bottom: 0;
  transform: translateX(-50%);
  width: 56px; height: 4px;
  background: var(--bc-blue);
  border-radius: 2px;
}

/* ── Composer ──────────────────────────────────────────────────── */
.composer {
  display: flex;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
}
.composer-avatar { flex-shrink: 0; }
.composer-main { flex: 1; min-width: 0; }
.composer-textarea {
  width: 100%;
  background: transparent;
  border: none;
  resize: none;
  color: var(--fg);
  font: inherit;
  font-size: 20px;
  line-height: 1.4;
  padding: 12px 0 4px;
  min-height: 56px;
  max-height: 320px;
  overflow-y: auto;
}
.composer-textarea::placeholder { color: var(--fg-mute); }
.composer-textarea:focus { outline: none; }

.composer-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 10px;
  border-top: 1px solid var(--line-soft);
  margin-top: 8px;
}
.composer-tools { display: flex; gap: 2px; color: var(--bc-blue); }
.composer-tools button {
  width: 34px; height: 34px;
  border-radius: 50%;
  border: none; background: transparent;
  color: var(--bc-blue);
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: background 120ms ease;
}
.composer-tools button:hover { background: var(--bc-blue-soft); }
.composer-meter {
  display: flex; align-items: center; gap: 14px;
}
.meter-ring {
  width: 24px; height: 24px;
  transform: rotate(-90deg);
}
.meter-ring circle { fill: none; stroke-width: 2.4; }
.meter-ring .track { stroke: var(--line); }
.meter-ring .indicator { stroke: var(--bc-blue); transition: stroke-dashoffset 120ms linear, stroke 120ms linear; }
.meter-ring.is-warn .indicator { stroke: #ffd400; }
.meter-ring.is-over .indicator  { stroke: #f4212e; }

.composer-submit {
  background: var(--bc-blue);
  color: white;
  border: none;
  font-weight: 700;
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  font-size: 15px;
  transition: background 120ms ease, opacity 120ms ease;
}
.composer-submit:hover { background: var(--bc-blue-hover); }
.composer-submit:disabled { opacity: .5; cursor: not-allowed; }

/* ── Post ──────────────────────────────────────────────────────── */
.post {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  cursor: pointer;
  transition: background 100ms ease;
}
.post:hover { background: var(--bg-hover); }
.post-avatar-link { display: block; width: 40px; height: 40px; }
.post-main { min-width: 0; }
.post-head {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 15px;
  line-height: 1.25;
  flex-wrap: nowrap;
  white-space: nowrap;
}
.post-name { font-weight: 700; color: var(--fg); }
.post-name:hover { text-decoration: underline; }
.post-verified { width: 16px; height: 16px; color: var(--bc-blue); flex-shrink: 0; display: none; }
.post.is-verified .post-verified { display: inline-block; }
.post-handle, .post-sep, .post-time { color: var(--fg-mute); font-weight: 400; }
.post-more {
  margin-left: auto;
  width: 30px; height: 30px;
  border-radius: 50%;
  border: none; background: transparent; color: var(--fg-mute);
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease;
}
.post-more:hover { background: var(--bc-blue-soft); color: var(--bc-blue); }

.post-body {
  font-size: 15px;
  line-height: 1.4;
  margin-top: 2px;
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-wrap: anywhere;
}
.post-body a.tag,
.post-body a.mention,
.post-body a.link { color: var(--bc-blue); }
.post-body a.tag:hover,
.post-body a.mention:hover,
.post-body a.link:hover { text-decoration: underline; }

.post-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 425px;
  margin-top: 10px;
  margin-left: -8px;
}
.act {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: transparent;
  border: none;
  color: var(--fg-mute);
  padding: 4px 8px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  transition: color 120ms ease, background 120ms ease;
}
.act svg { transition: transform 180ms cubic-bezier(.2,.6,.4,1.4); }
.act-count { min-width: 16px; text-align: left; tabular-nums: 1; }
.act-reply:hover  { color: var(--bc-blue);     }
.act-reply:hover .act-count { color: var(--bc-blue); }
.act-reply:hover svg { background: var(--bc-blue-soft); border-radius: 50%; }
.act-repost:hover { color: var(--green-repost); }
.act-like:hover   { color: var(--red-like);    }
.act-share:hover  { color: var(--bc-blue);     }

.act-like-fill { display: none; color: var(--red-like); }
.act.is-active.act-like .act-like-outline { display: none; }
.act.is-active.act-like .act-like-fill    { display: inline-block; }
.act.is-active.act-like { color: var(--red-like); }
.act.is-active.act-like svg { animation: like-pop 380ms ease; }
@keyframes like-pop {
  0%   { transform: scale(.7); }
  40%  { transform: scale(1.25); }
  100% { transform: scale(1); }
}
.act.is-active.act-repost { color: var(--green-repost); }

/* ── Avatar ────────────────────────────────────────────────────── */
.avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -.01em;
  flex-shrink: 0;
  user-select: none;
  background:
    radial-gradient(120% 120% at 25% 20%, hsla(var(--h, 210),85%,62%,1) 0%, hsla(var(--h, 210),70%,38%,1) 70%, hsla(var(--h, 210),60%,22%,1) 100%);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.06);
}
.avatar.sm { width: 32px; height: 32px; font-size: 13px; }
.avatar.lg { width: 134px; height: 134px; font-size: 48px; border: 4px solid var(--bg); }

/* ── Right aside ───────────────────────────────────────────────── */
.aside {
  padding: 12px 16px 24px;
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow-y: auto;
  scrollbar-width: thin;
}
.aside::-webkit-scrollbar { width: 6px; }
.aside::-webkit-scrollbar-thumb { background: transparent; }
.aside:hover::-webkit-scrollbar-thumb { background: var(--line); border-radius: 3px; }

.search {
  position: sticky;
  top: 0;
  padding-bottom: 8px;
  background: var(--bg);
  z-index: 2;
}
.search-box {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: var(--bg-elev);
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  transition: background 120ms ease, border-color 120ms ease;
}
.search-box:focus-within {
  background: var(--bg);
  border-color: var(--bc-blue);
}
.search-box svg { color: var(--fg-mute); }
.search-box:focus-within svg { color: var(--bc-blue); }
.search-box input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--fg);
  font: inherit;
  font-size: 15px;
}
.search-box input:focus { outline: none; }

.card {
  background: var(--bg-elev);
  border-radius: var(--radius-lg);
  margin-bottom: 16px;
  overflow: hidden;
}
.card-title {
  padding: 12px 16px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -.01em;
}
.card-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  cursor: pointer;
  transition: background 120ms ease;
}
.card-row:hover { background: var(--bg-press); }
.card-row-main { flex: 1; min-width: 0; }
.card-row-main > div { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.card-row-cat { font-size: 13px; color: var(--fg-mute); }
.card-row-title { font-size: 15px; font-weight: 700; }
.card-row-meta { font-size: 13px; color: var(--fg-mute); }
.card-foot {
  padding: 14px 16px;
  color: var(--bc-blue);
  cursor: pointer;
  font-size: 15px;
  transition: background 120ms ease;
}
.card-foot:hover { background: var(--bg-press); }

.suggest-name { font-weight: 700; font-size: 15px; display: flex; align-items: center; gap: 4px; }
.suggest-handle { font-size: 13px; color: var(--fg-mute); }
.btn-follow {
  margin-left: auto;
  background: var(--fg);
  color: black;
  border: none;
  font-weight: 700;
  padding: 7px 16px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  font-size: 14px;
  transition: background 120ms ease;
}
.btn-follow:hover { background: white; }
.btn-follow.is-following {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--line);
}
.btn-follow.is-following:hover {
  border-color: rgba(244,33,46,.4);
  color: #f4212e;
  background: rgba(244,33,46,.08);
}
.btn-follow.is-following:hover .label-following { display: none; }
.btn-follow.is-following:hover .label-unfollow { display: inline; }
.btn-follow .label-unfollow { display: none; }

.foot-small {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--fg-mute);
  display: flex; flex-wrap: wrap; gap: 4px 10px;
}
.foot-small a:hover { text-decoration: underline; }

/* ── Profile view ──────────────────────────────────────────────── */
.profile-banner {
  height: 200px;
  background:
    radial-gradient(120% 120% at 20% 10%, hsla(var(--h, 210),85%,52%,.95) 0%, hsla(var(--h, 210),60%,22%,1) 80%);
}
.profile-meta {
  padding: 12px 16px 16px;
  position: relative;
  border-bottom: 1px solid var(--line);
}
.profile-avatar-wrap {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-top: -75px;
  margin-bottom: 8px;
}
.profile-name { font-size: 20px; font-weight: 800; letter-spacing: -.01em; display: flex; align-items: center; gap: 6px; }
.profile-handle { color: var(--fg-mute); font-size: 15px; }
.profile-bio { margin: 12px 0; font-size: 15px; }
.profile-stats { display: flex; gap: 20px; font-size: 14px; color: var(--fg-mute); }
.profile-stats strong { color: var(--fg); margin-right: 4px; }
.profile-stats span { cursor: pointer; }
.profile-stats span:hover strong { text-decoration: underline; }

.profile-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--line);
}

/* ── Empty / loading ───────────────────────────────────────────── */
.empty {
  padding: 60px 32px;
  text-align: center;
  color: var(--fg-mute);
}
.empty h2 { color: var(--fg); margin: 0 0 6px; }
.skeleton {
  background: linear-gradient(90deg, var(--bg-elev) 0%, var(--bg-elev-2) 50%, var(--bg-elev) 100%);
  background-size: 200% 100%;
  animation: shimmer 1.2s linear infinite;
  border-radius: 8px;
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ── Modal ─────────────────────────────────────────────────────── */
.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(91,112,131,.4);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 5vh;
  z-index: 100;
}
.modal {
  background: var(--bg);
  border-radius: var(--radius-lg);
  width: 600px;
  max-width: calc(100vw - 32px);
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-pop);
}
.modal-head {
  display: flex; align-items: center; gap: 16px;
  padding: 8px 16px;
  position: sticky; top: 0;
  background: rgba(0,0,0,.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 2;
}
.modal-close {
  width: 34px; height: 34px;
  border-radius: 50%;
  border: none; background: transparent; color: var(--fg);
  cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
}
.modal-close:hover { background: var(--bg-hover); }

/* ── Toast ─────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bc-blue);
  color: white;
  padding: 12px 20px;
  border-radius: var(--radius);
  font-weight: 500;
  box-shadow: var(--shadow-pop);
  z-index: 200;
  animation: toast-in 200ms ease, toast-out 200ms ease 2.6s forwards;
}
@keyframes toast-in {
  from { transform: translate(-50%, 20px); opacity: 0; }
  to   { transform: translate(-50%, 0);    opacity: 1; }
}
@keyframes toast-out {
  to { transform: translate(-50%, 20px); opacity: 0; }
}

/* ── Detail view (post + replies) ──────────────────────────────── */
.post-detail {
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
}
.detail-head {
  display: flex; align-items: center; gap: 12px;
  padding-bottom: 8px;
}
.detail-author { flex: 1; min-width: 0; }
.detail-name { font-weight: 700; display: flex; align-items: center; gap: 4px; }
.detail-handle { color: var(--fg-mute); font-size: 14px; }
.detail-body {
  font-size: 23px;
  line-height: 1.35;
  margin: 4px 0 12px;
  white-space: pre-wrap;
  word-wrap: break-word;
}
.detail-time {
  color: var(--fg-mute);
  font-size: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
}
.detail-stats {
  display: flex; gap: 20px;
  padding: 12px 0;
  font-size: 14px;
  color: var(--fg-mute);
  border-bottom: 1px solid var(--line-soft);
}
.detail-stats strong { color: var(--fg); margin-right: 4px; }
.detail-actions {
  display: flex;
  justify-content: space-around;
  padding: 4px 0;
}
.detail-actions .act { padding: 8px 16px; }

/* ── Responsive ────────────────────────────────────────────────── */
@media (max-width: 1280px) {
  .shell { grid-template-columns: 88px var(--feed-w) var(--aside-w); }
  .rail-link span:not(.rail-only) { display: none; }
  .rail-link { justify-content: center; padding: 12px; }
  .rail-cta { font-size: 0; padding: 14px; margin: 16px 6px 0; }
  .rail-cta::before {
    content: '＋'; font-size: 24px; line-height: 1;
  }
  .rail-user-text { display: none; }
  .rail-user { justify-content: center; }
}
@media (max-width: 1000px) {
  .shell { grid-template-columns: 88px var(--feed-w); }
  .aside { display: none; }
}
@media (max-width: 700px) {
  :root { --feed-w: 100vw; }
  .shell { grid-template-columns: 1fr; }
  .rail {
    position: fixed;
    bottom: 0; left: 0; right: 0;
    top: auto;
    height: auto;
    background: rgba(0,0,0,.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--line);
    flex-direction: row;
    justify-content: space-around;
    padding: 4px 0;
    z-index: 50;
  }
  .rail-logo, .rail-cta, .rail-user, .rail-spacer { display: none; }
  .rail-link { flex: 1; }
  .feed { border: none; padding-bottom: 60px; }
  .detail-body { font-size: 19px; }
}