/* ── Kernel Design System ─────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #0d0d0d;
  --s1:        #141414;
  --s2:        #1c1c1c;
  --s3:        #242424;
  --s4:        #2e2e2e;
  --txt:       #e2e2e2;
  --txt2:      #848484;
  --txt3:      #505050;
  --accent:    #7c6af7;
  --accent-dim:#7c6af718;
  --vote:      #f97316;
  --vote-dim:  #f9731618;
  --green:     #22c55e;
  --red:       #ef4444;
  --r:         10px;
  --r-sm:      6px;
  --gap:       12px;
  --max:       680px;
}

html { background: var(--bg); color: var(--txt); font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, sans-serif; font-size: 15px; line-height: 1.5; -webkit-font-smoothing: antialiased; }
body { min-height: 100dvh; }

a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }

/* ── Layout ─── */
.page { max-width: var(--max); margin: 0 auto; padding: 0 var(--gap) 80px; }

/* ── Top bar ─── */
.topbar {
  position: sticky; top: 0; z-index: 100;
  background: #0d0d0dcc;
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border-bottom: 1px solid #ffffff08;
}
.topbar-inner {
  max-width: var(--max); margin: 0 auto;
  display: flex; align-items: center; gap: 10px;
  padding: 0 var(--gap); height: 50px;
}
.logo {
  font-size: 17px; font-weight: 700; letter-spacing: -0.5px;
  color: var(--txt);
  display: flex; align-items: center; gap: 6px;
}
.logo-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.topbar-spacer { flex: 1; }
.topbar-search {
  display: flex; align-items: center; gap: 8px;
  background: var(--s2); border-radius: var(--r);
  padding: 7px 12px; flex: 1; max-width: 240px;
}
.topbar-search input {
  background: none; border: none; outline: none;
  color: var(--txt); font: inherit; font-size: 14px; width: 100%;
}
.topbar-search input::placeholder { color: var(--txt3); }
.icon-btn {
  width: 34px; height: 34px; border-radius: var(--r-sm);
  display: flex; align-items: center; justify-content: center;
  color: var(--txt2); background: var(--s2);
  transition: background 0.12s, color 0.12s;
}
.icon-btn:hover { background: var(--s3); color: var(--txt); }
.avatar {
  width: 30px; height: 30px; border-radius: 50%;
  background: linear-gradient(135deg, #7c6af7 0%, #a78bfa 100%);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; color: #fff;
  cursor: pointer; flex-shrink: 0;
}

/* ── Sort bar ─── */
.sortbar {
  display: flex; align-items: center; gap: 4px;
  padding: 14px 0 10px;
}
.sort-btn {
  padding: 6px 12px; border-radius: var(--r-sm);
  font-size: 13px; font-weight: 500; color: var(--txt2);
  transition: background 0.12s, color 0.12s;
}
.sort-btn:hover { background: var(--s2); color: var(--txt); }
.sort-btn.active { background: var(--accent-dim); color: var(--accent); }
.sort-icon { margin-right: 4px; font-size: 11px; }

/* ── Feed ─── */
.feed { display: flex; flex-direction: column; gap: 8px; }

/* ── Post card ─── */
.post-card {
  background: var(--s1);
  border-radius: var(--r);
  padding: 14px 16px;
  display: grid; grid-template-columns: 1fr auto;
  gap: 10px;
  transition: background 0.12s;
  cursor: pointer;
  position: relative;
}
.post-card:hover { background: var(--s2); }
.post-card:active { background: var(--s3); }

.post-card-body { min-width: 0; }

.post-meta {
  display: flex; align-items: center; gap: 6px;
  margin-bottom: 6px; flex-wrap: wrap;
}
.community-tag {
  font-size: 11px; font-weight: 600; letter-spacing: 0.3px;
  padding: 2px 7px; border-radius: 4px;
  background: var(--accent-dim); color: var(--accent);
  text-transform: lowercase;
}
.community-tag.orange { background: #f9731618; color: #f97316; }
.community-tag.green  { background: #22c55e18; color: #22c55e; }
.community-tag.blue   { background: #3b82f618; color: #60a5fa; }
.community-tag.pink   { background: #ec489918; color: #f472b6; }
.community-tag.yellow { background: #eab30818; color: #fbbf24; }
.post-author { font-size: 12px; color: var(--txt3); }
.post-time   { font-size: 12px; color: var(--txt3); }
.dot-sep     { color: var(--txt3); font-size: 10px; }

.post-title {
  font-size: 15px; font-weight: 600; line-height: 1.35;
  color: var(--txt); margin-bottom: 6px;
  letter-spacing: -0.1px;
}
.post-snippet {
  font-size: 13px; color: var(--txt2); line-height: 1.5;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden; margin-bottom: 10px;
}
.post-link-preview {
  display: flex; align-items: center; gap: 8px;
  background: var(--s3); border-radius: var(--r-sm);
  padding: 8px 10px; margin-bottom: 10px;
  font-size: 12px; color: var(--txt2);
}
.post-link-icon { font-size: 14px; }
.post-link-url  { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.post-footer {
  display: flex; align-items: center; gap: 12px;
}
.vote-row {
  display: flex; align-items: center; gap: 4px;
}
.vote-btn {
  width: 26px; height: 26px; border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  color: var(--txt3); font-size: 12px;
  transition: background 0.1s, color 0.1s;
}
.vote-btn:hover         { background: var(--vote-dim); color: var(--vote); }
.vote-btn.active        { color: var(--vote); }
.vote-btn.down:hover    { background: #3b82f618; color: #60a5fa; }
.vote-btn.down.active   { color: #60a5fa; }
.vote-count { font-size: 13px; font-weight: 600; color: var(--txt2); min-width: 24px; text-align: center; }
.vote-count.hot { color: var(--vote); }

.stat-btn {
  display: flex; align-items: center; gap: 5px;
  font-size: 12px; color: var(--txt3); padding: 4px 6px;
  border-radius: var(--r-sm);
  transition: background 0.1s, color 0.1s;
}
.stat-btn:hover { background: var(--s3); color: var(--txt2); }

.post-thumb {
  width: 72px; height: 72px; border-radius: var(--r-sm);
  object-fit: cover; background: var(--s3);
  flex-shrink: 0; display: flex; align-items: center; justify-content: center;
  font-size: 28px; align-self: start; margin-top: 2px;
}

/* ── Pinned card ─── */
.post-card.pinned { border-left: 2px solid var(--accent); }
.pinned-label { font-size: 11px; color: var(--accent); font-weight: 500; margin-bottom: 8px; letter-spacing: 0.3px; }

/* ── Divider ─── */
.section-label {
  font-size: 11px; font-weight: 600; letter-spacing: 0.8px;
  color: var(--txt3); text-transform: uppercase;
  padding: 14px 0 8px;
}

/* ── Post page ─── */
.back-btn {
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--txt2); padding: 10px 0;
  transition: color 0.12s;
}
.back-btn:hover { color: var(--txt); }

.post-full { background: var(--s1); border-radius: var(--r); padding: 20px 18px; margin-bottom: 8px; }
.post-full .post-title { font-size: 19px; font-weight: 700; letter-spacing: -0.3px; margin-bottom: 10px; line-height: 1.3; }
.post-body { font-size: 14px; color: var(--txt2); line-height: 1.65; margin-bottom: 16px; }
.post-body p + p { margin-top: 10px; }

.post-actions {
  display: flex; align-items: center; gap: 10px;
  padding-top: 14px; border-top: 1px solid #ffffff07;
}
.action-btn {
  display: flex; align-items: center; gap: 5px;
  font-size: 12px; color: var(--txt3); padding: 6px 10px;
  border-radius: var(--r-sm); background: var(--s2);
  transition: background 0.1s, color 0.1s;
}
.action-btn:hover { background: var(--s3); color: var(--txt2); }

.vote-bar {
  display: flex; align-items: center; gap: 6px;
  background: var(--s2); border-radius: var(--r-sm);
  padding: 4px 10px;
}
.vote-bar .vote-count { font-size: 14px; font-weight: 700; color: var(--vote); }

/* ── Comments ─── */
.comments-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 0 10px;
}
.comments-title { font-size: 14px; font-weight: 600; color: var(--txt); }
.comments-sort  { font-size: 12px; color: var(--txt3); }

.comment-input-box {
  background: var(--s1); border-radius: var(--r);
  padding: 12px 14px; margin-bottom: 8px;
}
.comment-input {
  width: 100%; background: var(--s2); border: none; outline: none;
  border-radius: var(--r-sm); color: var(--txt); font: inherit; font-size: 14px;
  padding: 10px 12px; resize: none; min-height: 72px; line-height: 1.5;
}
.comment-input::placeholder { color: var(--txt3); }
.comment-input-footer {
  display: flex; justify-content: flex-end; margin-top: 8px;
}
.submit-btn {
  padding: 7px 16px; background: var(--accent); color: #fff;
  border-radius: var(--r-sm); font-size: 13px; font-weight: 600;
  transition: opacity 0.12s;
}
.submit-btn:hover { opacity: 0.88; }

.comment {
  background: var(--s1); border-radius: var(--r);
  padding: 14px 14px 12px; margin-bottom: 6px;
}
.comment-meta {
  display: flex; align-items: center; gap: 6px; margin-bottom: 8px;
}
.comment-avatar {
  width: 22px; height: 22px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 10px; font-weight: 700; color: #fff; flex-shrink: 0;
}
.comment-author { font-size: 13px; font-weight: 600; color: var(--txt); }
.comment-author.op { color: var(--accent); }
.comment-time   { font-size: 12px; color: var(--txt3); }
.comment-body   { font-size: 14px; color: var(--txt2); line-height: 1.6; margin-bottom: 10px; }
.comment-footer {
  display: flex; align-items: center; gap: 6px;
}
.comment-vote {
  display: flex; align-items: center; gap: 2px;
}
.c-vote-btn {
  width: 24px; height: 24px; border-radius: 5px;
  display: flex; align-items: center; justify-content: center;
  color: var(--txt3); font-size: 11px;
  transition: background 0.1s, color 0.1s;
}
.c-vote-btn:hover { background: var(--vote-dim); color: var(--vote); }
.c-vote-count { font-size: 12px; font-weight: 600; color: var(--txt3); min-width: 20px; text-align: center; }
.c-stat-btn {
  font-size: 11px; color: var(--txt3); padding: 3px 7px;
  border-radius: 4px; transition: background 0.1s, color 0.1s;
}
.c-stat-btn:hover { background: var(--s2); color: var(--txt2); }

/* nested comments */
.comment-replies {
  margin-top: 8px; margin-left: 14px;
  padding-left: 12px;
  border-left: 1px solid #ffffff0a;
  display: flex; flex-direction: column; gap: 6px;
}
.comment.nested { background: var(--s2); padding: 10px 12px 8px; }
.comment.nested2 { background: var(--s3); padding: 8px 10px 6px; }

/* ── Awards / flair ─── */
.award { display: inline-flex; align-items: center; gap: 3px; font-size: 11px; padding: 2px 6px; border-radius: 4px; background: var(--s3); color: var(--txt2); margin-left: 4px; }

/* ── Bottom nav (mobile) ─── */
.bottom-nav {
  position: fixed; bottom: 0; left: 0; right: 0;
  background: #0d0d0ddd;
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border-top: 1px solid #ffffff08;
  display: flex; align-items: center;
  padding: 0 8px; padding-bottom: env(safe-area-inset-bottom, 0);
  height: calc(56px + env(safe-area-inset-bottom, 0));
}
.nav-item {
  flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 3px; padding: 8px 0; color: var(--txt3);
  font-size: 10px; font-weight: 500; letter-spacing: 0.3px;
  transition: color 0.12s;
}
.nav-item.active { color: var(--accent); }
.nav-item svg   { width: 22px; height: 22px; stroke-width: 1.75; }

.nav-post-btn {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--accent); display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 22px; box-shadow: 0 4px 16px #7c6af740;
}