/* Artifact platform tokens — auto-resolved */
:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
}

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

html, body, #root {
  height: 100%;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

button {
  font-family: var(--font-sans);
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  transition: all 0.2s ease;
}

input, textarea, select {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--neutral);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  width: 100%;
}

input:focus, textarea:focus, select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-tint);
}

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }

/* ============ LAYOUT ============ */
.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: var(--surface);
  border-bottom: 1px solid var(--neutral);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: grid;
  place-items: center;
  color: white;
  box-shadow: var(--shadow-sm);
}

.topbar-actions { display: flex; gap: 0.5rem; align-items: center; }

.chip {
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.8rem;
  background: var(--primary-tint);
  color: var(--primary-dark);
  font-weight: 500;
}

/* ============ BUTTONS ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.2rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  box-shadow: var(--shadow-sm);
}

.btn-primary {
  background: var(--primary);
  color: white;
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: var(--shadow-md); }

.btn-ghost {
  background: transparent;
  color: var(--text);
  box-shadow: none;
  padding: 0.5rem 0.9rem;
}
.btn-ghost:hover { background: var(--primary-tint); color: var(--primary-dark); }

.btn-soft {
  background: var(--primary-tint);
  color: var(--primary-dark);
  box-shadow: none;
}
.btn-soft:hover { background: var(--primary); color: white; }

.btn-danger {
  background: var(--danger);
  color: white;
}

.btn-lg {
  padding: 1rem 1.75rem;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

/* ============ WELCOME ============ */
.welcome {
  flex: 1;
  display: grid;
  place-items: center;
  padding: 2rem 1.25rem;
  background:
    radial-gradient(1200px 500px at 10% -10%, var(--primary-tint), transparent 60%),
    radial-gradient(900px 400px at 100% 110%, color-mix(in srgb, var(--accent) 25%, transparent), transparent 60%),
    var(--bg);
}

.welcome-card {
  max-width: 560px;
  width: 100%;
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-lg);
  text-align: center;
  animation: fadeUp 0.6s ease;
}

.welcome-logo {
  width: 72px;
  height: 72px;
  margin: 0 auto 1.25rem;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: grid;
  place-items: center;
  color: white;
  box-shadow: var(--shadow-md);
}

.welcome h1 {
  font-size: 1.9rem;
  margin-bottom: 0.4rem;
  letter-spacing: -0.01em;
}

.welcome .subtitle {
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.welcome-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.feature {
  padding: 0.9rem 0.5rem;
  border-radius: var(--radius-md);
  background: var(--bg);
  border: 1px solid var(--neutral);
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
}
.feature svg { color: var(--primary); }

.welcome-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.disclaimer {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 1.25rem;
  padding: 0.75rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
  line-height: 1.5;
}

/* ============ AUTH FORM ============ */
.auth-form {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  text-align: left;
  margin-top: 0.5rem;
}
.auth-form label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
  display: block;
  margin-bottom: 0.35rem;
}
.auth-toggle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}
.auth-toggle button {
  color: var(--primary);
  font-weight: 600;
  text-decoration: underline;
}

.error-msg {
  background: color-mix(in srgb, var(--danger) 12%, transparent);
  color: var(--danger);
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
}

/* ============ CHAT ============ */
.chat-shell {
  flex: 1;
  display: flex;
  flex-direction: column;
  max-width: 820px;
  width: 100%;
  margin: 0 auto;
  padding: 1rem;
  min-height: 0;
}

.chat-window {
  flex: 1;
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 60vh;
}

.chat-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--neutral);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.chat-header h2 {
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  scroll-behavior: smooth;
}

.bubble {
  max-width: 78%;
  padding: 0.85rem 1.05rem;
  border-radius: var(--radius-lg);
  line-height: 1.55;
  font-size: 0.95rem;
  animation: fadeUp 0.3s ease;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.bubble.assistant {
  background: var(--primary-tint);
  color: var(--text);
  border-bottom-left-radius: var(--radius-sm);
  align-self: flex-start;
}

.bubble.user {
  background: var(--primary);
  color: white;
  border-bottom-right-radius: var(--radius-sm);
  align-self: flex-end;
}

.bubble-meta {
  font-size: 0.72rem;
  opacity: 0.65;
  margin-top: 0.3rem;
}

.typing {
  display: inline-flex;
  gap: 4px;
  padding: 0.5rem 0;
}
.typing span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--primary);
  animation: bounce 1.2s infinite;
}
.typing span:nth-child(2) { animation-delay: 0.15s; }
.typing span:nth-child(3) { animation-delay: 0.3s; }

.mood-picker {
  display: flex;
  gap: 0.6rem;
  justify-content: center;
  padding: 0.75rem;
  flex-wrap: wrap;
}

.mood-btn {
  font-size: 1.8rem;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--neutral);
  display: grid;
  place-items: center;
  transition: transform 0.15s, border-color 0.15s;
}
.mood-btn:hover { transform: scale(1.1); border-color: var(--primary); }
.mood-btn.selected { border-color: var(--primary); background: var(--primary-tint); }

.chat-input-bar {
  padding: 0.9rem 1rem;
  border-top: 1px solid var(--neutral);
  display: flex;
  gap: 0.6rem;
  align-items: flex-end;
  background: var(--surface);
}
.chat-input-bar textarea {
  flex: 1;
  resize: none;
  min-height: 46px;
  max-height: 120px;
  border-radius: var(--radius-lg);
}

.icon-btn {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--primary);
  color: white;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}
.icon-btn:hover { background: var(--primary-dark); }
.icon-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ============ SHARE PROMPT ============ */
.share-prompt {
  margin: 0.75rem 0;
  padding: 1rem;
  background: var(--surface);
  border: 1px solid var(--primary-tint);
  border-radius: var(--radius-md);
  align-self: center;
  max-width: 90%;
  text-align: center;
}
.share-prompt h3 { font-size: 1rem; margin-bottom: 0.35rem; }
.share-prompt p { color: var(--text-muted); font-size: 0.88rem; margin-bottom: 0.8rem; line-height: 1.5; }
.share-prompt-actions { display: flex; gap: 0.5rem; justify-content: center; flex-wrap: wrap; }

.resource-notice {
  padding: 0.9rem 1rem;
  background: color-mix(in srgb, var(--warning) 15%, transparent);
  border-left: 3px solid var(--warning);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text);
  margin: 0.5rem 1rem;
  line-height: 1.5;
}

/* ============ ADMIN ============ */
.admin-shell {
  flex: 1;
  padding: 1.5rem;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
}

.admin-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--neutral);
  overflow-x: auto;
}
.admin-tab {
  padding: 0.75rem 1.1rem;
  font-weight: 500;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}
.admin-tab[aria-current="page"] {
  color: var(--primary);
  border-color: var(--primary);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.stat-card {
  background: var(--surface);
  padding: 1.1rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--neutral);
}
.stat-card .label { color: var(--text-muted); font-size: 0.85rem; }
.stat-card .value { font-size: 1.8rem; font-weight: 700; margin-top: 0.3rem; color: var(--primary); }

.card-list {
  display: grid;
  gap: 0.75rem;
}

.friend-card, .share-card {
  background: var(--surface);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--neutral);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.share-card .header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.75rem;
}
.share-card .friend-name { font-weight: 600; }
.share-card .timestamp { font-size: 0.78rem; color: var(--text-muted); }
.share-card .mood {
  font-size: 1.5rem;
  margin-right: 0.3rem;
}
.share-card .summary {
  background: var(--bg);
  padding: 0.7rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--text);
}
.share-card details {
  margin-top: 0.4rem;
  font-size: 0.85rem;
}
.share-card details summary {
  cursor: pointer;
  color: var(--primary);
  font-weight: 500;
  padding: 0.3rem 0;
}
.share-card .message-log {
  margin-top: 0.5rem;
  padding: 0.5rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
  max-height: 260px;
  overflow-y: auto;
}
.share-card .message-log .msg {
  padding: 0.3rem 0.4rem;
  font-size: 0.82rem;
  line-height: 1.5;
}
.share-card .message-log .msg strong { color: var(--primary-dark); }

.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-muted);
}
.empty-state svg { margin-bottom: 1rem; opacity: 0.5; }

.share-link-box {
  background: var(--surface);
  padding: 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--neutral);
  box-shadow: var(--shadow-sm);
}
.share-link-box label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text);
}
.share-link-box .link-row {
  display: flex;
  gap: 0.5rem;
}
.share-link-box input {
  background: var(--bg);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* ============ DIALOG ============ */
dialog {
  border: none;
  border-radius: var(--radius-lg);
  padding: 0;
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow-lg);
  max-width: 420px;
  width: calc(100% - 2rem);
}
dialog::backdrop { background: var(--scrim); backdrop-filter: blur(3px); }

dialog .dialog-content { padding: 1.5rem; }
dialog h2 { margin-bottom: 0.5rem; font-size: 1.2rem; }
dialog p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.55; margin-bottom: 1rem; }
dialog menu {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
  margin-top: 1rem;
  list-style: none;
}

/* ============ TOAST ============ */
.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 100;
  animation: fadeUp 0.3s ease;
  font-size: 0.9rem;
}

/* ============ ANIMATIONS ============ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes bounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-6px); opacity: 1; }
}

/* ============ RESPONSIVE ============ */
@media (max-width: 640px) {
  .welcome-card { padding: 1.75rem 1.25rem; }
  .welcome h1 { font-size: 1.5rem; }
  .welcome-features { grid-template-columns: repeat(3, 1fr); font-size: 0.72rem; }
  .bubble { max-width: 88%; }
  .admin-shell { padding: 1rem; }
  .topbar { padding: 0.75rem 1rem; }
}