/* Snail web app — design tokens, dark mode, components */

:root {
  --bg: #fafaf9;
  --surface: #ffffff;
  --fg: #1c1917;
  --muted: #78716c;
  --border: #e7e5e4;
  --accent: #d97706;
  --accent-hover: #b45309;
  --danger: #dc2626;
  --radius: 8px;
  --font: system-ui, -apple-system, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1917;
    --surface: #292524;
    --fg: #e7e5e4;
    --muted: #a8a29e;
    --border: #44403c;
    --accent: #f59e0b;
    --accent-hover: #d97706;
  }
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  min-height: 100vh;
}

#app {
  height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

header h1 { font-size: 1.25rem; font-weight: 700; }

nav { display: flex; gap: 0.5rem; align-items: center; }
nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.85rem;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius);
  white-space: nowrap;
}
nav a:hover { color: var(--fg); }
nav a.active { color: var(--accent); font-weight: 600; }

#layout {
  display: flex;
  flex: 1;
  overflow: hidden;
}

#sidebar {
  width: 240px;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  padding: 1rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

#sidebar .sidebar-header {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

#sidebar .group-list { list-style: none; }
#sidebar .group-card {
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius);
  margin-bottom: 0.25rem;
  cursor: pointer;
  transition: background 0.1s;
  font-size: 0.9rem;
}
#sidebar .group-card:hover { background: var(--surface); }
#sidebar .group-card.active {
  background: var(--surface);
  font-weight: 600;
  color: var(--accent);
}
#sidebar .group-card .meta {
  font-size: 0.7rem;
  color: var(--muted);
  margin-top: 0.1rem;
}

main {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem 2rem;
}

.auth-screen { max-width: 360px; margin: 4rem auto; text-align: center; }
.auth-screen h2 { margin-bottom: 1.5rem; }

.form-group { margin-bottom: 1rem; text-align: left; }
.form-group label { display: block; font-size: 0.875rem; color: var(--muted); margin-bottom: 0.25rem; }
.form-group input, .form-group select {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--fg);
  font-size: 1rem;
}

.btn {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  cursor: pointer;
  font-weight: 600;
}
.btn:hover { background: var(--accent-hover); }
.btn:disabled { opacity: 0.4; cursor: default; }

#logout-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.8rem;
}

.group-list { list-style: none; }
.group-card {
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
  cursor: pointer;
  transition: background 0.15s;
}
.group-card:hover { background: var(--surface); }
.group-card h3 { font-size: 1.1rem; margin-bottom: 0.25rem; }
.group-card .meta { font-size: 0.8rem; color: var(--muted); }

.feed {
  flex: 1;
  overflow-y: auto;
  margin-bottom: 1rem;
}
.feed-meta { margin-bottom: 1.5rem; font-size: .875rem; color: var(--muted); }
.feed-rotation { margin-top: .25rem; font-size: .8rem; }
.feed-loading { color: var(--muted); text-align: center; padding: 2rem 0; }
.feed-empty { color: var(--muted); text-align: center; padding: 2rem 0; }

/* Author-grouped letter blocks */
.letter-group {
  margin-bottom: 1.75rem;
  border-left: 4px solid var(--border);
  padding: 0.75rem 1rem;
  border-radius: 0 8px 8px 0;
}
.letter-group-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.6rem;
}
.author-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.author-name {
  font-weight: 700;
  font-size: 0.9rem;
}
.letter-date {
  color: var(--muted);
  font-size: 0.75rem;
  margin-left: auto;
}
.letter-body {
  margin-top: 0.25rem;
}
.letter-para {
  margin-bottom: 0.6rem;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.7;
}

/* Compose section embedded below feed */
.compose-section {
  border-top: 2px solid var(--border);
  padding-top: 1rem;
  margin-top: 0.5rem;
}
.compose-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}
.compose-label { font-size: 0.85rem; font-weight: 600; color: var(--accent); }
.compose-banner {
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
  font-size: 0.85rem;
}
.muted-banner {
  background: var(--surface);
  color: var(--fg);
  border: 1px solid var(--border);
}
.compose-editor {
  width: 100%;
  min-height: 240px;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--fg);
  font-family: var(--font);
  font-size: 0.95rem;
  line-height: 1.7;
  resize: vertical;
}
.compose-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 0.5rem;
}
.compose-hint { font-size: 0.75rem; color: var(--muted); }

.error-banner {
  background: #fef2f2;
  color: var(--danger);
  border: 1px solid #fecaca;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.about { max-width: 560px; margin: 1rem auto; }
.about h2 { margin-bottom: 1rem; }
.about p { margin-bottom: 1rem; }
.about ol { margin: 0 0 1rem 1.25rem; }
.about li { margin-bottom: 0.5rem; }

.landing { max-width: 560px; margin: 2rem auto; }
.landing section { margin-bottom: 2rem; }
.landing-hero h2 { font-size: 2rem; margin-bottom: 0.25rem; }
.landing-tagline { color: var(--muted); font-size: 1.05rem; margin-bottom: 1rem; }
.landing p { margin-bottom: 1rem; line-height: 1.5; }
.landing h3 { margin-bottom: 0.75rem; }
.landing ol { margin: 0 0 1rem 1.25rem; }
.landing li { margin-bottom: 0.5rem; }
.landing-signin { border-top: 1px solid var(--border, #e3ded8); padding-top: 1.5rem; }
.landing-signin-note { color: var(--muted); font-size: 0.9rem; }

.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translate(-50%, 1rem);
  background: var(--accent);
  color: #fff;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: none;
  z-index: 50;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* Media display in feed */
.media-placeholder {
  display: flex; align-items: center; justify-content: center;
  height: 120px; background: var(--surface); border-radius: 6px;
  color: var(--muted); font-size: 0.85rem;
}
.media-placeholder.loading { opacity: 0.6; }
.letter-media {
  max-width: 100%; max-height: 400px; border-radius: 6px;
  margin: 0.5rem 0; display: block; cursor: zoom-in;
}
.letter-media.doc-link {
  display: inline-flex; align-items: center; gap: 0.25rem;
  padding: 0.5rem 0.75rem; background: var(--surface);
  border: 1px solid var(--border); border-radius: 6px;
  color: var(--fg); text-decoration: none; font-size: 0.85rem; cursor: pointer;
}

/* Compose attachments */
.compose-attach { margin-bottom: 0.5rem; }
.compose-attach-label {
  cursor: pointer; color: var(--accent); font-size: 0.85rem;
  padding: 0.25rem 0; display: inline-block;
}
.compose-attach-label:hover { text-decoration: underline; }
.attachment-row {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.4rem 0.6rem; background: var(--surface);
  border: 1px solid var(--border); border-radius: 6px;
  margin-bottom: 0.25rem; font-size: 0.8rem;
}
.attachment-row .att-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.attachment-row .att-size { color: var(--muted); white-space: nowrap; }

/* Editable letter blocks (one per Telegram message). */
.compose-block {
  position: relative;
  padding: 0.6rem 2rem 0.6rem 0.6rem;
  border: 1px solid var(--border); border-radius: 8px;
  margin-bottom: 0.6rem; background: var(--surface);
}
.compose-block.changed-in-telegram { border-color: var(--accent); }
.compose-block-media { font-size: 0.85rem; color: var(--muted); margin-bottom: 0.35rem; }
.compose-block-edit {
  width: 100%; min-height: 8rem; resize: vertical;
  padding: 0.6rem 0.8rem; font-family: var(--font);
  font-size: 0.95rem; line-height: 1.7;
}
.compose-block-actions {
  display: flex; align-items: center; gap: 0.5rem; margin-top: 0.4rem;
}
.compose-block-actions .btn { padding: 0.25rem 0.8rem; font-size: 0.8rem; }
.btn-cancel { background: none; color: var(--muted); border: 1px solid var(--border); }
.btn-cancel:hover { background: var(--surface); }
.compose-block-status { font-size: 0.75rem; color: var(--muted); }
.compose-block-remove {
  position: absolute; top: 0.4rem; right: 0.6rem;
  cursor: pointer; color: var(--muted); font-size: 0.9rem;
}
.compose-block-remove:hover { color: var(--accent); }
.attachment-row .att-remove { cursor: pointer; color: var(--danger); font-weight: 700; padding: 0 0.2rem; }