:root, [data-theme="light"] {
  --bg:             #f4f5f7;
  --surface:        #ffffff;
  --text:           #1a1d23;
  --text-muted:     #6b7280;
  --border:         #e5e7eb;
  --header-bg:      #ffffff;
  --header-shadow:  0 1px 3px rgba(0,0,0,0.08);
  --bar-bg:         #ffffff;
  --bar-border:     #e5e7eb;
  --input-bg:       #ffffff;
  --input-border:   #d1d5db;
  --accent:         #e31337;
  --accent-hover:   #c0102e;
  --ghost-border:   #d1d5db;
  --ghost-color:    #374151;
  --ghost-hover-bg: #f3f4f6;
}

[data-theme="dark"] {
  --bg:             #0d1117;
  --surface:        #161b22;
  --text:           #e6edf3;
  --text-muted:     #7d8590;
  --border:         #30363d;
  --header-bg:      #161b22;
  --header-shadow:  0 1px 4px rgba(0,0,0,0.5);
  --bar-bg:         #161b22;
  --bar-border:     #30363d;
  --input-bg:       #0d1117;
  --input-border:   #30363d;
  --accent:         #ff4d6d;
  --accent-hover:   #ff1f47;
  --ghost-border:   #30363d;
  --ghost-color:    #c9d1d9;
  --ghost-hover-bg: #21262d;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  line-height: 1.6;
  padding-bottom: 72px;
  transition: background 0.2s ease, color 0.2s ease;
}

/* ── Header ── */
.app-header {
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--header-shadow);
  position: sticky;
  top: 0;
  z-index: 200;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.app-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}
.app-logo:hover { color: var(--accent-hover); }
.app-logo img { width: 22px; height: 22px; }

.header-tagline {
  font-size: 0.78rem;
  color: var(--text-muted);
  white-space: nowrap;
}

@media (max-width: 600px) {
  .header-tagline { display: none; }
}

.header-spacer { flex: 1; }

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ── Ghost button ── */
.btn-ghost {
  background: transparent;
  border: 1px solid var(--ghost-border);
  color: var(--ghost-color);
  border-radius: 8px;
  width: 36px;
  height: 36px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.85rem;
  line-height: 1;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.btn-ghost:hover {
  background: var(--ghost-hover-bg);
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Sign-in ── */
#signin-container .input-group { width: 220px; }

#signin-container .input-group-text {
  background: var(--input-bg);
  border-color: var(--input-border);
  color: var(--text-muted);
  font-size: 0.85rem;
  transition: background 0.2s, border-color 0.2s;
}
#signin-container .form-control {
  background: var(--input-bg);
  border-color: var(--input-border);
  color: var(--text);
  font-size: 0.85rem;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}
#signin-container .form-control::placeholder { color: var(--text-muted); }
#signin-container .form-control:focus {
  background: var(--input-bg);
  border-color: var(--accent);
  color: var(--text);
  box-shadow: 0 0 0 3px rgba(227,19,55,0.15);
}
#signin-container .btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  font-size: 0.85rem;
}
#signin-container .btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

/* ── Main content area ── */
.main-wrap {
  max-width: 900px;
  margin: 28px auto;
  padding: 0 20px;
}

#hr-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px 36px;
  min-height: 200px;
  transition: background 0.2s ease, border-color 0.2s ease;
}

#hr-content:empty::after {
  content: 'Loading\2026';
  display: block;
  text-align: center;
  color: var(--text-muted);
  padding: 60px 0;
}

#hr-content h1 {
  font-size: 1.65rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text);
  margin-bottom: 4px;
}

#hr-content h2 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 8px;
  margin-top: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.post-date {
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--text-muted);
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}

.post-tag {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 8px;
}

#hr-content p, #hr-content li {
  color: var(--text);
  line-height: 1.75;
}

#hr-content a { color: var(--accent); }
#hr-content a:hover { color: var(--accent-hover); }

#hr-content img {
  border-radius: 8px;
  margin: 12px 0;
  max-width: 100%;
}

#hr-content blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 16px;
  color: var(--text-muted);
  margin: 16px 0;
}

#hr-content hr { border-color: var(--border); }

#hr-content pre, #hr-content code {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.88em;
}
#hr-content pre { padding: 12px 16px; }
#hr-content code { padding: 2px 6px; }

/* ── Bottom action bar ── */
.action-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bar-bg);
  border-top: 1px solid var(--bar-border);
  padding: 10px 20px;
  display: flex;
  align-items: center;
  gap: 6px;
  z-index: 200;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.action-bar .btn-icon {
  width: 38px;
  height: 38px;
  padding: 0;
  border-radius: 9px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  border: 1px solid var(--ghost-border);
  background: transparent;
  color: var(--ghost-color);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  text-decoration: none;
}
.action-bar .btn-icon:hover {
  background: var(--ghost-hover-bg);
  border-color: var(--accent);
  color: var(--accent);
}
.action-bar .btn-icon:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  pointer-events: none;
}
.action-bar .btn-next-up {
  background: #16a34a;
  border-color: #16a34a;
  color: #fff !important;
  gap: 1px;
}
.action-bar .btn-next-up:hover {
  background: #15803d !important;
  border-color: #15803d !important;
}
.action-bar .btn-next {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff !important;
  gap: 1px;
}
.action-bar .btn-next:hover {
  background: var(--accent-hover) !important;
  border-color: var(--accent-hover) !important;
}

.action-bar .sep {
  width: 1px;
  height: 24px;
  background: var(--border);
  margin: 0 2px;
  flex-shrink: 0;
}

.action-bar .branding {
  margin-left: auto;
  font-size: 0.78rem;
  color: var(--text-muted);
  white-space: nowrap;
}
.action-bar .branding a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}
.action-bar .branding a:hover { color: var(--accent-hover); }

#vote-weight-container {
  display: none;
  align-items: center;
  gap: 4px;
}
#vote-weight-slider {
  width: 72px;
  accent-color: var(--accent);
  cursor: pointer;
}
#vote-weight-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  min-width: 30px;
  text-align: right;
}

@media (max-width: 480px) {
  .action-bar .branding { display: none; }
  #signin-container .input-group { width: 160px; }
  #vote-weight-slider { width: 54px; }
  #vote-weight-container { display: none !important; }
}

/* ── Vote weight popup (mobile) ── */
#vote-popup {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  top: 0;
  z-index: 300;
  background: rgba(0,0,0,0.4);
  align-items: flex-end;
}
#vote-popup.open {
  display: flex;
}
#vote-popup-inner {
  width: 100%;
  background: var(--bar-bg);
  border-top: 1px solid var(--bar-border);
  border-radius: 14px 14px 0 0;
  padding: 20px 24px calc(20px + env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.vote-popup-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}
#vote-popup-close {
  background: none;
  border: none;
  font-size: 1rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
}
.vote-popup-slider-row {
  display: flex;
  align-items: center;
  gap: 12px;
}
#vote-popup-slider {
  flex: 1;
  accent-color: var(--accent);
  cursor: pointer;
}
#vote-popup-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-width: 36px;
  text-align: right;
}
#vote-popup-confirm {
  background: var(--accent);
  border: none;
  border-radius: 9px;
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  padding: 12px;
  cursor: pointer;
  width: 100%;
}
#vote-popup-confirm:active {
  background: var(--accent-hover);
}