:root {
  --bg: #f3ecdf;
  --panel: rgba(255, 252, 246, 0.9);
  --panel-strong: rgba(255, 250, 241, 0.98);
  --line: rgba(92, 66, 34, 0.15);
  --text: #1f1b16;
  --muted: #6f6558;
  --user: #1f1b16;
  --assistant: #fff7eb;
  --accent: #c96b2c;
  --accent-dark: #8a4518;
  --shadow: 0 20px 60px rgba(93, 61, 25, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Noto Sans JP", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(201, 107, 44, 0.18), transparent 30%),
    radial-gradient(circle at right, rgba(130, 169, 118, 0.18), transparent 28%),
    linear-gradient(180deg, var(--bg) 0%, #f9f5ee 100%);
}

.page-shell {
  width: min(1280px, calc(100% - 32px));
  margin: 0 auto;
  padding: 36px 0 24px;
}

.app-shell {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.sidebar,
.chat-panel,
.settings-card,
.auth-card {
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--panel);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.sidebar {
  padding: 18px;
}

.sidebar-header {
  display: grid;
  gap: 12px;
}

.conversation-list {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

.conversation-item {
  display: grid;
  gap: 6px;
  justify-items: start;
  width: 100%;
  padding: 14px 16px;
  border-radius: 18px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(92, 66, 34, 0.12);
  text-align: left;
}

.conversation-item.active {
  color: white;
  background: var(--user);
}

.conversation-item.active .conversation-meta {
  color: rgba(255, 255, 255, 0.72);
}

.conversation-title {
  width: 100%;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-weight: 700;
}

.conversation-meta,
.conversation-empty {
  color: var(--muted);
  font-size: 0.88rem;
}

.hidden {
  display: none !important;
}

.auth-overlay,
.settings-overlay {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(31, 27, 22, 0.42);
  backdrop-filter: blur(14px);
}

.settings-overlay {
  z-index: 11;
}

.auth-card {
  width: min(460px, 100%);
  padding: 28px;
}

.settings-card {
  width: min(860px, 100%);
  max-height: 90vh;
  overflow: auto;
  padding: 28px;
  background: var(--panel-strong);
}

.auth-tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 18px;
}

.auth-tab {
  flex: 1;
  color: var(--text);
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(92, 66, 34, 0.14);
}

.auth-tab.active {
  color: white;
  background: linear-gradient(135deg, var(--accent) 0%, #de8c45 100%);
}

.auth-card h2,
.settings-card h2,
h1,
.message-role,
button,
.eyebrow,
.toolbar-label,
.settings-title,
.summary-card strong {
  font-family: "Manrope", sans-serif;
}

.auth-copy,
.hero-copy,
.status-text,
.hint,
.conversation-meta,
.conversation-empty,
.admin-user-meta {
  color: var(--muted);
}

.auth-form,
.settings-form {
  display: grid;
  gap: 14px;
  margin-top: 20px;
}

input[type="email"],
input[type="password"],
.admin-reset-input,
textarea {
  width: 100%;
  border: 1px solid rgba(92, 66, 34, 0.18);
  border-radius: 18px;
  padding: 16px 18px;
  font: inherit;
  font-size: 1rem;
  color: var(--text);
  background: rgba(255, 255, 255, 0.92);
}

input[type="email"]:focus,
input[type="password"]:focus,
.admin-reset-input:focus,
textarea:focus {
  outline: 2px solid rgba(201, 107, 44, 0.22);
  border-color: var(--accent);
}

.auth-error {
  min-height: 1.2em;
  margin: 0;
  color: #9a2f18;
  font-size: 0.92rem;
}

.hero {
  margin-bottom: 20px;
  animation: slide-up 500ms ease-out;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  color: var(--accent-dark);
}

h1 {
  margin: 0;
  max-width: 12ch;
  font-size: clamp(2.3rem, 6vw, 4.8rem);
  line-height: 0.95;
}

.hero-copy {
  max-width: 640px;
  margin: 16px 0 0;
  font-size: 1rem;
}

.hero-copy:empty {
  display: none;
}

.chat-panel {
  overflow: hidden;
}

.panel-toolbar,
.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 18px 0;
}

.settings-header {
  padding: 0;
}

.toolbar-actions {
  display: flex;
  gap: 10px;
}

.toolbar-label {
  margin: 0;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  color: var(--accent-dark);
  text-transform: uppercase;
}

.status-text {
  margin: 6px 0 0;
  font-size: 0.95rem;
}

.messages {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 24px;
  min-height: 60vh;
  max-height: 62vh;
  overflow-y: auto;
}

.message {
  max-width: min(82%, 720px);
  padding: 16px 18px;
  border-radius: 22px;
  border: 1px solid var(--line);
  animation: slide-up 260ms ease-out;
}

.message p {
  margin: 8px 0 0;
  line-height: 1.7;
  white-space: pre-wrap;
}

.message-role {
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.message.user {
  align-self: flex-end;
  background: var(--user);
  color: white;
}

.message.user .message-role {
  color: rgba(255, 255, 255, 0.7);
}

.message.assistant {
  align-self: flex-start;
  background: var(--assistant);
}

.composer {
  display: grid;
  gap: 14px;
  padding: 18px;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.56);
}

textarea {
  resize: none;
  line-height: 1.6;
}

.composer-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.hint {
  margin: 0;
  font-size: 0.9rem;
}

button {
  border: 0;
  border-radius: 999px;
  padding: 14px 24px;
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: white;
  background: linear-gradient(135deg, var(--accent) 0%, #de8c45 100%);
  cursor: pointer;
  transition: transform 140ms ease, opacity 140ms ease;
}

.secondary-button {
  color: var(--text);
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(92, 66, 34, 0.14);
}

button:hover {
  transform: translateY(-1px);
}

button:disabled {
  opacity: 0.6;
  cursor: wait;
  transform: none;
}

.settings-title {
  margin: 0;
  font-weight: 800;
}

.admin-panel {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.admin-summary {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.summary-card {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.74);
}

.summary-card span {
  display: block;
  color: var(--muted);
  font-size: 0.9rem;
}

.summary-card strong {
  display: block;
  margin-top: 6px;
  font-size: 1.8rem;
}

.admin-checkbox {
  color: var(--muted);
  font-size: 0.95rem;
}

.admin-user-list {
  display: grid;
  gap: 12px;
}

.admin-user-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.74);
}

.admin-user-meta {
  margin: 6px 0 0;
  font-size: 0.88rem;
}

.admin-reset-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@keyframes slide-up {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(100% - 18px, 100%);
    padding-top: 24px;
  }

  .messages {
    min-height: 56vh;
    padding: 16px;
  }

  .message {
    max-width: 100%;
  }

  .composer-actions,
  .panel-toolbar,
  .toolbar-actions,
  .settings-header,
  .admin-summary,
  .admin-user-item,
  .admin-reset-form {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: stretch;
  }

  button {
    width: 100%;
  }
}