:root {
  --paper: #f5f2ea;
  --paper-strong: #fbfaf6;
  --ink: #1b2923;
  --muted: #748078;
  --line: #dcddd3;
  --green: #315f4b;
  --sage: #dfe8dd;
  --warm: #c97852;
  --danger: #b84537;
  --shadow: 0 24px 70px rgba(28, 41, 35, 0.09);
}

* { box-sizing: border-box; }

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 8%, rgba(223, 232, 221, .8), transparent 26rem),
    linear-gradient(135deg, #f8f4eb 0%, var(--paper) 44%, #efe9dc 100%);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

button,
input,
textarea,
select {
  font: inherit;
}

button {
  color: inherit;
}

.hidden {
  display: none !important;
}

.app-shell {
  display: grid;
  grid-template-columns: 230px 1fr;
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 34px 24px 28px;
  display: flex;
  flex-direction: column;
  border-right: 1px solid rgba(220, 221, 211, .9);
  background: rgba(245, 242, 234, .82);
  backdrop-filter: blur(20px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 13px;
  background: var(--green);
  color: var(--paper-strong);
  font: 18px/1 Georgia, "Songti SC", serif;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 18px;
  letter-spacing: .02em;
}

.brand small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 11px;
}

.nav {
  display: grid;
  gap: 8px;
  margin-top: 66px;
}

.nav-item {
  padding: 14px 16px;
  border: 0;
  border-radius: 14px;
  background: transparent;
  color: var(--muted);
  text-align: left;
  cursor: pointer;
}

.nav-item.active {
  background: var(--sage);
  color: var(--green);
  font-weight: 700;
}

.side-note {
  margin-top: auto;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.side-note strong {
  font: 42px/1 Georgia, "Songti SC", serif;
  color: var(--green);
}

.side-note span,
.side-note p {
  color: var(--muted);
  font-size: 12px;
}

.side-note p {
  margin: 12px 0 0;
  line-height: 1.7;
}

main {
  min-width: 0;
}

.view {
  display: none;
  min-height: 100vh;
}

.view.active {
  display: block;
}

#today-view {
  padding: 54px min(5vw, 70px) 60px;
}

.topbar,
.simple-header {
  display: flex;
  justify-content: space-between;
  gap: 28px;
  align-items: flex-start;
}

.eyebrow {
  margin: 0 0 11px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .12em;
}

h1 {
  margin: 0;
  font: 500 clamp(34px, 5vw, 54px)/1.15 Georgia, "Songti SC", serif;
  letter-spacing: -.04em;
}

h2 {
  margin: 0;
  font: 500 24px/1.3 Georgia, "Songti SC", serif;
}

.pill-button,
.send-button,
.mini-button {
  border: 1px solid var(--green);
  background: var(--green);
  color: white;
  cursor: pointer;
  transition: transform .18s ease, opacity .18s ease, background .18s ease;
}

.pill-button {
  min-height: 40px;
  padding: 0 18px;
  border-radius: 999px;
}

.pill-button.subtle,
.mini-button {
  border-color: var(--line);
  background: rgba(251, 250, 246, .72);
  color: var(--ink);
}

.pill-button:disabled,
.send-button:disabled {
  cursor: not-allowed;
  opacity: .5;
}

.pill-button:not(:disabled):hover,
.send-button:not(:disabled):hover,
.mini-button:hover {
  transform: translateY(-1px);
}

.chat-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, 430px);
  gap: 28px;
  align-items: start;
  margin-top: 44px;
}

.conversation-card,
.journal-preview,
.settings-card {
  border: 1px solid rgba(220, 221, 211, .9);
  border-radius: 28px;
  background: rgba(251, 250, 246, .7);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.conversation-card {
  min-height: calc(100vh - 170px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.conversation {
  flex: 1;
  display: grid;
  align-content: start;
  gap: 22px;
  padding: 28px;
  overflow: auto;
  scroll-behavior: smooth;
}

.message {
  max-width: 78%;
  display: flex;
  gap: 12px;
  animation: rise .24s ease both;
}

.message.user {
  justify-self: end;
  flex-direction: row-reverse;
}

.avatar {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--sage);
  color: var(--green);
  font: 15px Georgia, "Songti SC", serif;
}

.message.user .avatar {
  background: #dfd3c6;
  color: #795a47;
}

.bubble {
  padding: 14px 17px;
  border-radius: 4px 18px 18px;
  background: var(--paper-strong);
  line-height: 1.75;
}

.message.user .bubble {
  border-radius: 18px 4px 18px 18px;
  background: var(--green);
  color: white;
}

.bubble p {
  margin: 0;
}

.bubble p + p {
  margin-top: 6px;
}

.typing {
  display: flex;
  gap: 5px;
  padding: 10px 4px;
}

.typing i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--muted);
  animation: blink 1s infinite alternate;
}

.typing i:nth-child(2) { animation-delay: .18s; }
.typing i:nth-child(3) { animation-delay: .36s; }

.composer-panel {
  padding: 16px;
  border-top: 1px solid var(--line);
  background: rgba(245, 242, 234, .72);
}

textarea {
  width: 100%;
  min-height: 78px;
  max-height: 190px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 20px;
  outline: none;
  padding: 15px 16px;
  background: rgba(251, 250, 246, .9);
  color: var(--ink);
  line-height: 1.65;
}

textarea:focus,
input:focus,
select:focus {
  border-color: rgba(49, 95, 75, .58);
  box-shadow: 0 0 0 4px rgba(49, 95, 75, .08);
}

.composer-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 12px;
}

.send-button {
  min-height: 40px;
  padding: 0 20px;
  border-radius: 999px;
}

.journal-preview {
  position: sticky;
  top: 28px;
  min-height: 540px;
  padding: 22px;
}

.preview-empty {
  min-height: 496px;
  display: grid;
  place-content: center;
  gap: 10px;
  text-align: center;
  color: var(--muted);
}

.preview-empty p {
  margin: 0;
  color: var(--ink);
  font: 22px Georgia, "Songti SC", serif;
}

.preview-empty span {
  font-size: 13px;
  line-height: 1.8;
}

.paper {
  padding: 34px 34px 28px;
  border-radius: 20px;
  background: var(--paper-strong);
}

.paper-meta {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .08em;
}

.paper h2 {
  margin-top: 30px;
  font-size: 30px;
}

.paper-content {
  margin-top: 22px;
}

.paper-content p {
  margin: 0 0 18px;
  font: 15px/1.95 Georgia, "Songti SC", serif;
  text-align: justify;
}

.takeaway {
  margin-top: 28px;
  padding: 18px 0 0 18px;
  border-top: 1px solid var(--line);
  border-left: 3px solid var(--green);
}

.takeaway span {
  color: var(--green);
  font-size: 11px;
  letter-spacing: .16em;
}

.takeaway p {
  margin: 8px 0 0;
  font: 16px/1.75 Georgia, "Songti SC", serif;
}

.paper-actions {
  display: flex;
  gap: 10px;
  margin-top: 26px;
}

.simple-header {
  padding: 64px min(7vw, 86px) 42px;
  border-bottom: 1px solid var(--line);
}

.history-list,
.settings-grid {
  width: min(960px, calc(100% - 48px));
  margin: 48px auto;
}

.month-title {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin: 34px 0 8px;
}

.month-title h2 {
  font-size: 32px;
}

.month-title span {
  color: var(--muted);
  font-size: 12px;
}

.history-row {
  display: grid;
  grid-template-columns: 82px 1fr auto;
  gap: 18px;
  align-items: center;
  padding: 22px 10px;
  border-top: 1px solid var(--line);
}

.history-row time {
  min-height: 42px;
  display: grid;
  align-content: start;
  color: var(--muted);
}

.history-row time strong {
  color: var(--ink);
  font: 30px/1 Georgia, serif;
}

.history-row time span,
.history-row p {
  font-size: 12px;
}

.history-row h3 {
  margin: 0 0 7px;
  font: 20px/1.35 Georgia, "Songti SC", serif;
}

.history-row p {
  margin: 0;
  color: var(--muted);
}

.mini-link {
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
}

.mini-link:hover h3 {
  color: var(--green);
}

.history-actions {
  display: flex;
  gap: 8px;
}

.danger-button {
  min-height: 36px;
  padding: 0 14px;
  border: 1px solid rgba(184, 69, 55, .35);
  border-radius: 999px;
  background: rgba(184, 69, 55, .08);
  color: var(--danger);
  cursor: pointer;
}

.empty {
  padding: 80px 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  text-align: center;
}

.settings-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 380px);
  gap: 24px;
}

.settings-card {
  padding: 28px;
  display: grid;
  gap: 20px;
}

.settings-card > div:first-child p,
.storage-note p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.8;
}

label {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
}

input,
select {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 14px;
  outline: none;
  padding: 0 14px;
  background: rgba(251, 250, 246, .88);
  color: var(--ink);
}

.secret-row,
.model-row {
  display: grid;
  gap: 8px;
}

.secret-row {
  grid-template-columns: 1fr auto;
}

.mini-button {
  min-width: 68px;
  border-radius: 14px;
}

.button-row {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  z-index: 30;
  transform: translate(-50%, 16px);
  opacity: 0;
  pointer-events: none;
  padding: 12px 18px;
  border-radius: 999px;
  background: rgba(28, 41, 35, .92);
  color: white;
  box-shadow: var(--shadow);
  transition: opacity .2s ease, transform .2s ease;
}

.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

@keyframes rise {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes blink {
  from { opacity: .3; transform: translateY(1px); }
  to { opacity: 1; transform: translateY(-1px); }
}

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    inset: auto 16px 16px;
    width: auto;
    height: auto;
    z-index: 20;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 10px;
    border: 1px solid rgba(220, 221, 211, .88);
    border-radius: 999px;
    box-shadow: var(--shadow);
  }

  .brand,
  .side-note {
    display: none;
  }

  .nav {
    margin: 0;
    grid-auto-flow: column;
  }

  .nav-item {
    padding: 10px 18px;
    text-align: center;
  }

  #today-view {
    padding: 34px 18px 104px;
  }

  .chat-layout,
  .settings-grid {
    grid-template-columns: 1fr;
  }

  .journal-preview {
    position: static;
  }

  .simple-header {
    padding: 38px 22px 28px;
  }

  .history-list,
  .settings-grid {
    width: calc(100% - 36px);
    margin-bottom: 110px;
  }
}

@media (max-width: 620px) {
  .topbar,
  .simple-header {
    display: grid;
  }

  .composer-actions,
  .paper-actions,
  .button-row {
    flex-wrap: wrap;
  }

  .history-row {
    grid-template-columns: 56px 1fr;
  }

  .history-actions {
    grid-column: 2;
  }
}