* { box-sizing: border-box; }
body { margin: 0; font-family: Segoe UI, Arial, sans-serif; background: radial-gradient(circle at top, #eef3ff 0%, #f5f7fb 45%, #f5f7fb 100%); color: #172033; }
.page { display: none; }
.page.active { display: block; }
.hidden { display: none !important; }

.auth-shell { max-width: 520px; margin: 6vh auto; background: linear-gradient(165deg, #ffffff 0%, #f8fbff 100%); padding: 28px; border-radius: 20px; border: 1px solid #dce6f7; box-shadow: 0 18px 42px rgba(23,32,51,.14); }
.auth-form { display: grid; gap: 10px; margin-top: 10px; }
.auth-switcher { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.auth-tab { border: 1px solid #ced6e5; background: #fff; border-radius: 999px; padding: 8px 14px; cursor: pointer; font-weight: 600; color: #21314f; }
.auth-tab.active { background: linear-gradient(90deg, #174ea6, #4a63c7); color: #fff; border-color: transparent; }

input, textarea, button { font: inherit; padding: 11px 12px; border-radius: 11px; border: 1px solid #ccd5e3; }
input:focus, textarea:focus { outline: none; border-color: #5a7de0; box-shadow: 0 0 0 3px rgba(90,125,224,.16); }
button { background: linear-gradient(100deg, #174ea6, #3a62ca); color: white; border: 0; cursor: pointer; }
button:hover { opacity: .94; }
.auth-form button { font-weight: 700; letter-spacing: 0.2px; padding: 12px; box-shadow: 0 6px 16px rgba(23,78,166,.25); }
.auth-shell h1 { margin: 0; font-size: 2rem; background: linear-gradient(90deg, #174ea6, #4a63c7); -webkit-background-clip: text; color: transparent; }
.auth-shell p { color: #52607a; margin: 8px 0 10px; }

.topbar { display: flex; justify-content: space-between; align-items: center; padding: 16px 24px; background: white; box-shadow: 0 2px 10px rgba(0,0,0,.08); }
.tabs { display: flex; gap: 8px; padding: 10px 16px; background: #eef2f9; flex-wrap: wrap; }
.tab-btn { background: #fff; color: #172033; border: 1px solid #d3ddec; }
.tab-btn.active { background: #174ea6; color: #fff; }
.main-wrap { max-width: 1100px; margin: 18px auto; padding: 0 12px; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.card { background: #fff; border-radius: 16px; padding: 18px; box-shadow: 0 6px 20px rgba(0,0,0,.06); }
.row { display: grid; grid-template-columns: 1fr auto; gap: 8px; margin-bottom: 12px; }
.stack { display: grid; gap: 8px; }
.hint { background: #eff7ee; color: #0a6d36; border-radius: 10px; padding: 8px; margin-top: 6px; }
.danger { background: #b3261e; }
.result-card { border: 1px solid #d6deec; border-radius: 12px; padding: 12px; background: #fafcff; }
.structure { width: 220px; max-width: 100%; border-radius: 10px; border: 1px solid #d3dceb; background: #fff; }
.submission-card { border: 1px solid #d9e1ef; border-radius: 12px; padding: 10px; margin-top: 8px; background: #fbfdff; }
.status-pill { padding: 3px 9px; border-radius: 12px; font-size: 12px; background: #e8edf9; }
.review-actions { margin-top: 8px; display: grid; gap: 6px; }
.review-button-row { display: flex; gap: 8px; }
.mini-btn { width: fit-content; padding: 8px 12px; font-size: .88rem; }
.card-grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.suggestion-card { cursor: pointer; transition: transform .18s ease, box-shadow .2s ease; }
.suggestion-card:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(0,0,0,.08); }
.pub-section { margin-top: 10px; border: 1px solid #d6deec; border-radius: 10px; padding: 10px; background: #fff; }
.pub-section summary { font-weight: 700; cursor: pointer; color: #1e2d4f; }
.depth-1 { margin-left: 10px; border-left: 3px solid #dce6fb; }
.depth-2, .depth-3 { margin-left: 18px; border-left: 3px solid #e9eefb; }
.autocomplete-list { border: 1px solid #d6deec; border-radius: 10px; background: #fff; margin-bottom: 10px; box-shadow: 0 6px 20px rgba(0,0,0,.08); max-height: 240px; overflow-y: auto; }
.autocomplete-item { width: 100%; text-align: left; background: #fff; color: #172033; border: 0; border-bottom: 1px solid #edf1f8; border-radius: 0; display: flex; justify-content: space-between; }
.autocomplete-item:hover { background: #f5f8ff; opacity: 1; }
.ai-subtitle { margin-top: 0; color: #425270; }
.ai-chat-shell { border: 1px solid #d6deec; border-radius: 14px; background: linear-gradient(180deg, #f9fbff 0%, #f2f6ff 100%); overflow: hidden; }
.ai-chat-messages { min-height: 340px; max-height: 460px; overflow-y: auto; padding: 14px; display: grid; gap: 12px; }
.chat-msg { display: flex; }
.chat-msg.user { justify-content: flex-end; }
.chat-msg.assistant { justify-content: flex-start; }
.chat-bubble { max-width: min(82%, 720px); padding: 10px 12px; border-radius: 12px; white-space: pre-wrap; line-height: 1.45; font-size: 0.95rem; box-shadow: 0 4px 12px rgba(0,0,0,.07); }
.chat-msg.user .chat-bubble { background: linear-gradient(100deg, #174ea6, #4d67cc); color: #fff; border-bottom-right-radius: 6px; }
.chat-msg.assistant .chat-bubble { background: #fff; color: #172033; border: 1px solid #d7e0f1; border-bottom-left-radius: 6px; }
.ai-controls { border-top: 1px solid #dbe4f4; background: #fff; padding: 12px; display: grid; gap: 10px; }
.ai-prompt-row { display: grid; grid-template-columns: 1fr auto; gap: 8px; align-items: end; }
.ai-prompt-row textarea { min-height: 76px; resize: vertical; }

@media (max-width: 760px) {
  .row { grid-template-columns: 1fr; }
  .topbar { flex-direction: column; align-items: flex-start; gap: 8px; }
  .ai-prompt-row { grid-template-columns: 1fr; }
  .chat-bubble { max-width: 95%; }
}