/* ============================================================
   Practice — AI tutor page styles
   ============================================================ */

.ai-page {
  width: min(960px, 100% - 80px);
  margin: 120px auto 64px;
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 22px;
}
@media (max-width: 820px) {
  .ai-page {
    width: min(960px, 100% - 28px);
    margin: 90px auto 48px;
  }
}

.ai-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 40px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--ink-line);
}
.ai-header .eyebrow {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--red);
  display: block;
  margin-bottom: 12px;
}
.ai-header h1 {
  font-family: var(--f-serif);
  font-weight: 300;
  font-size: clamp(38px, 5.4vw, 60px);
  margin: 0;
  letter-spacing: 0.005em;
  color: var(--ink);
}
.ai-header h1 em {
  font-style: italic;
  color: var(--ink-soft);
}
.ai-status {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.18em;
  text-transform: lowercase;
  margin: 0;
}

/* ---------- Subject + model controls ---------- */
.ai-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: end;
}
.ai-controls .field {
  flex: 1 1 200px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.ai-controls .field span {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.ai-controls select {
  background: var(--bg-raised);
  color: var(--ink);
  border: 1px solid var(--ink-line);
  padding: 11px 14px;
  font-family: var(--f-serif);
  font-size: 15px;
  letter-spacing: 0.01em;
  cursor: pointer;
  outline: none;
  transition: border-color 200ms ease;
}
.ai-controls select:focus { border-color: var(--red); }

.ghost-btn {
  background: transparent;
  border: 1px solid var(--ink-line);
  color: var(--ink-soft);
  padding: 10px 18px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: lowercase;
  cursor: pointer;
  transition: all 200ms ease;
}
.ghost-btn:hover { color: var(--ink); border-color: var(--red); }

/* ---------- Thread ---------- */
.ai-thread {
  display: flex;
  flex-direction: column;
  gap: 26px;
  min-height: 320px;
  padding: 8px 0 8px;
}

.ai-empty {
  border: 1px dashed var(--ink-line);
  padding: 56px 36px;
  text-align: center;
  color: var(--ink-soft);
  font-family: var(--f-serif);
}
.ai-empty .empty-lede {
  font-style: italic;
  font-size: 18px;
  color: var(--ink);
  margin: 0 0 18px;
}
.ai-empty .empty-tips {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 14px;
  color: var(--ink-faint);
}
.ai-empty .empty-tips li::before { content: "· "; color: var(--red); }

.ai-message {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-family: var(--f-serif);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0.005em;
  color: var(--ink);
  max-width: 100%;
}
.ai-message[data-role="user"] {
  align-self: flex-end;
  max-width: min(640px, 100%);
}
.ai-message[data-role="assistant"] {
  align-self: stretch;
}
.ai-msg-meta {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.ai-msg-body {
  background: var(--bg-raised);
  border: 1px solid var(--ink-line);
  padding: 16px 20px;
  border-radius: 4px;
}
.ai-message[data-role="user"] .ai-msg-body {
  background: rgba(178, 34, 34, 0.08);
  border-color: rgba(178, 34, 34, 0.32);
}
.ai-msg-body p { margin: 0 0 12px; }
.ai-msg-body p:last-child { margin-bottom: 0; }
.ai-msg-body code {
  font-family: var(--f-mono);
  font-size: 0.92em;
  padding: 2px 6px;
  background: var(--bg);
  border: 1px solid var(--ink-line);
  border-radius: 3px;
}
.ai-msg-body pre {
  margin: 14px 0;
  padding: 14px 16px;
  background: var(--bg);
  border: 1px solid var(--ink-line);
  border-radius: 4px;
  overflow-x: auto;
  font-family: var(--f-mono);
  font-size: 13px;
  line-height: 1.55;
}
.ai-msg-body pre code {
  background: transparent;
  border: 0;
  padding: 0;
}
.ai-msg-body ul, .ai-msg-body ol { padding-left: 22px; margin: 0 0 12px; }
.ai-msg-body li { margin: 4px 0; }
.ai-msg-body blockquote {
  border-left: 2px solid var(--red);
  margin: 12px 0;
  padding: 4px 14px;
  color: var(--ink-soft);
  font-style: italic;
}
.ai-msg-body table {
  border-collapse: collapse;
  margin: 14px 0;
  font-size: 14px;
}
.ai-msg-body th, .ai-msg-body td {
  border: 1px solid var(--ink-line);
  padding: 6px 12px;
}
.ai-msg-body th { background: var(--bg); }
.ai-msg-body img {
  max-width: 100%;
  border: 1px solid var(--ink-line);
  margin: 8px 0;
}
.ai-msg-attachments {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 6px;
}
.ai-msg-attachments img {
  width: 96px;
  height: 96px;
  object-fit: cover;
  border: 1px solid var(--ink-line);
  border-radius: 3px;
}
.ai-msg-actions {
  display: flex;
  gap: 8px;
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: lowercase;
  color: var(--ink-faint);
}
.ai-msg-actions button {
  background: transparent;
  border: 0;
  color: var(--ink-faint);
  cursor: pointer;
  padding: 4px 0;
  font-family: inherit;
  font-size: inherit;
  letter-spacing: inherit;
}
.ai-msg-actions button:hover { color: var(--ink); }

.ai-thinking {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--red);
  border-radius: 50%;
  margin-left: 4px;
  vertical-align: middle;
  animation: ai-pulse 1.2s ease-in-out infinite;
}

/* Reasoning models stream their chain-of-thought separately. Render it
   as a collapsible block above the answer so it's available but doesn't
   crowd the page. */
.ai-reasoning {
  margin: 0 0 14px;
  padding: 10px 14px;
  background: var(--bg);
  border-left: 2px solid var(--ink-line);
  border-radius: 0 3px 3px 0;
  font-size: 14px;
  color: var(--ink-soft);
}
.ai-reasoning summary {
  cursor: pointer;
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--ink-faint);
  user-select: none;
  outline: none;
}
.ai-reasoning summary:hover { color: var(--ink); }
.ai-reasoning[open] summary { color: var(--ink); margin-bottom: 8px; }
.ai-reasoning-body {
  font-style: italic;
  line-height: 1.6;
}
.ai-reasoning-body p { margin: 0 0 8px; }
.ai-reasoning-body p:last-child { margin: 0; }
@keyframes ai-pulse {
  0%, 100% { opacity: 0.3; transform: scale(0.8); }
  50%      { opacity: 1;   transform: scale(1.1); }
}

/* ---------- Composer ---------- */
.ai-composer {
  position: sticky;
  bottom: 16px;
  background: var(--bg);
  border: 1px solid var(--ink-line);
  border-radius: 4px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.ai-composer:focus-within { border-color: var(--red); }

.ai-attachments {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.ai-attachments:empty { display: none; }
.ai-attach-thumb {
  position: relative;
  width: 64px;
  height: 64px;
}
.ai-attach-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border: 1px solid var(--ink-line);
  border-radius: 3px;
}
.ai-attach-thumb button {
  position: absolute;
  top: -6px;
  right: -6px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--bg-raised);
  border: 1px solid var(--ink-line);
  color: var(--ink);
  cursor: pointer;
  font-size: 12px;
  line-height: 1;
  padding: 0;
  display: grid;
  place-items: center;
}
.ai-attach-thumb button:hover { color: var(--red); border-color: var(--red); }

.ai-row {
  display: flex;
  align-items: end;
  gap: 10px;
}

.ai-attach {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  cursor: pointer;
  color: var(--ink-faint);
  border: 1px solid transparent;
  border-radius: 3px;
  transition: color 150ms ease, border-color 150ms ease;
}
.ai-attach:hover { color: var(--ink); border-color: var(--ink-line); }
.ai-attach i { width: 18px; height: 18px; }

#aiInput {
  flex: 1;
  resize: none;
  border: 0;
  background: transparent;
  color: var(--ink);
  font-family: var(--f-serif);
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: 0.005em;
  padding: 8px 0;
  outline: none;
  min-height: 24px;
  max-height: 220px;
  overflow-y: auto;
}
#aiInput::placeholder { color: var(--ink-faint); font-style: italic; }

.ai-send, .ai-stop {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  background: var(--red);
  color: #fff;
  border: 0;
  border-radius: 3px;
  cursor: pointer;
  transition: opacity 150ms ease;
}
.ai-send:disabled { opacity: 0.4; cursor: not-allowed; }
.ai-stop { background: transparent; color: var(--ink); border: 1px solid var(--ink-line); }
.ai-stop:hover { border-color: var(--red); color: var(--red); }
.ai-send i, .ai-stop i { width: 16px; height: 16px; }

.ai-foot {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: lowercase;
  color: var(--ink-faint);
  margin: 0;
}

/* When dragging an image over the composer */
.ai-composer.is-dragover {
  border-color: var(--red);
  background: rgba(178, 34, 34, 0.05);
}