@font-face {
  font-family: Syne;
  src: url("/static/fonts/Syne.woff2") format("woff2");
  font-weight: 400 800;
  font-style: normal;
  font-display: swap;
}

:root {
  --field: #E8EDF0;
  --ink: #1C2B33;
  --cyan: #2A6F7A;
  --ochre: #C4842A;
  --rule: #8A9AA1;
  --redline: #B54A3A;
  --paper: #F4F7F8;
  --font-cjk: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", "Noto Sans CJK SC", "Noto Sans SC", "Source Han Sans SC", sans-serif;
  --font-display: Syne, var(--font-cjk);
  --font-body: var(--font-cjk);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--field);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
}

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

button { cursor: pointer; }

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

/* ---- login: empty sheet + title block in the lower right ---- */

.login-screen {
  min-height: 100%;
  position: relative;
  overflow: hidden;
}

.login-sheet {
  position: absolute;
  inset: 18px;
  border: 3px solid var(--ink);
  background:
    linear-gradient(to right, rgba(42, 111, 122, 0.07) 1px, transparent 1px) 0 0 / 32px 32px,
    linear-gradient(to bottom, rgba(42, 111, 122, 0.07) 1px, transparent 1px) 0 0 / 32px 32px,
    var(--field);
  pointer-events: none;
}

.login-sheet::after {
  content: "";
  position: absolute;
  inset: 7px;
  border: 1px solid var(--cyan);
  pointer-events: none;
}

.titleblock {
  position: absolute;
  right: 48px;
  bottom: 48px;
  width: min(360px, calc(100% - 80px));
  background: var(--field);
  border: 2px solid var(--ink);
  padding: 22px 22px 18px;
}

.titleblock-rule {
  height: 6px;
  background: var(--cyan);
  margin: -22px -22px 16px;
}

.wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 34px;
  letter-spacing: 0.04em;
  margin: 0;
  line-height: 1.1;
}

.subtitle {
  margin: 4px 0 0;
  color: var(--cyan);
  font-size: 14px;
}

.titleblock form {
  margin-top: 18px;
  display: grid;
  gap: 12px;
}

.field {
  display: grid;
  gap: 4px;
}

.field span {
  font-size: 13px;
  color: var(--ink);
}

.field input,
.field select,
.composer textarea {
  border: 1px solid var(--ink);
  background: var(--paper);
  padding: 8px 10px;
  border-radius: 0;
  width: 100%;
}

.field input:focus,
.field select:focus,
.composer textarea:focus {
  outline: 2px solid var(--cyan);
  outline-offset: 0;
}

.form-error {
  margin: 0;
  color: var(--redline);
  font-size: 13px;
}

.titleblock-note {
  margin: 14px 0 0;
  font-size: 12px;
  color: var(--rule);
}

.btn-solid {
  border: 2px solid var(--ink);
  background: var(--ink);
  color: var(--field);
  padding: 8px 16px;
  font-family: var(--font-display);
  font-weight: 650;
  border-radius: 0;
}

.btn-solid:hover,
.btn-solid:focus-visible {
  background: var(--cyan);
  border-color: var(--cyan);
}

.btn-solid:disabled {
  opacity: 0.55;
  cursor: wait;
}

.btn-ghost {
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  padding: 4px 10px;
  font-family: var(--font-display);
  border-radius: 0;
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ---- workbench ---- */

.workbench {
  height: 100%;
  display: grid;
  grid-template-columns: 230px minmax(280px, 1fr) minmax(340px, 1.2fr);
  grid-template-rows: 56px 1fr;
  grid-template-areas:
    "top top top"
    "rail chat preview";
  background: var(--field);
}

.topbar {
  grid-area: top;
  display: grid;
  grid-template-columns: 230px 1fr auto auto;
  align-items: center;
  gap: 16px;
  padding: 0 16px 0 0;
  border-bottom: 2px solid var(--ink);
  background: var(--field);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 0 16px;
  border-right: 1px solid var(--rule);
  height: 100%;
}

.brand .wordmark {
  font-size: 22px;
}

.brand .subtitle {
  margin: 0;
}

.topbar-project {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
}

.topbar-project span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar-project #current-project-name {
  font-family: var(--font-display);
  font-weight: 650;
  font-size: 16px;
}

.quiet { color: var(--rule); font-size: 12px; }

.model-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--ink);
}

.model-btn {
  border: 0;
  background: var(--field);
  padding: 6px 12px;
  font-family: var(--font-display);
  font-size: 13px;
  border-right: 1px solid var(--ink);
}

.model-btn:last-child { border-right: 0; }

.model-btn.is-on {
  background: var(--ink);
  color: var(--field);
}

.topbar-user {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
}

.rail {
  grid-area: rail;
  border-right: 1px solid var(--rule);
  padding: 16px 0 24px;
  overflow: auto;
  min-height: 0;
}

.rail h1 {
  margin: 0 16px 6px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 650;
}

.rail-hint {
  margin: 0 16px 14px;
  font-size: 12px;
  color: var(--rule);
}

.project-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.project-list li button {
  width: 100%;
  text-align: left;
  border: 0;
  border-left: 4px solid transparent;
  background: transparent;
  padding: 10px 16px 10px 12px;
}

.project-list li button:hover,
.project-list li button:focus-visible {
  background: var(--paper);
}

.project-list li button.is-on {
  border-left-color: var(--ochre);
  background: var(--paper);
}

.project-list .pname {
  display: block;
  font-weight: 700;
}

.project-list .pmeta {
  display: block;
  font-size: 12px;
  color: var(--rule);
}

.project-list .punavail {
  opacity: 0.55;
}

.chat-pane {
  grid-area: chat;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  border-right: 3px solid var(--cyan);
  background: var(--paper);
}

.chat-log {
  flex: 1;
  overflow: auto;
  padding: 18px 18px 8px;
}

.empty-chat {
  color: var(--rule);
  max-width: 22em;
}

.msg {
  margin: 0 0 16px;
  padding: 0 0 16px;
  border-bottom: 1px solid rgba(138, 154, 161, 0.45);
}

.msg-meta {
  display: flex;
  gap: 10px;
  align-items: baseline;
  font-size: 12px;
  color: var(--rule);
  margin-bottom: 6px;
}

.msg-meta .who {
  font-family: var(--font-display);
  color: var(--ink);
  font-weight: 650;
}

.msg.is-user .who { color: var(--cyan); }

.msg-body {
  white-space: pre-wrap;
  word-break: break-word;
}

.plan-bits {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
}

.plan-bits li {
  padding: 2px 0 2px 10px;
  border-left: 2px solid var(--ochre);
  margin-bottom: 4px;
}

.plan-bits .pipe { border-left-color: var(--cyan); }
.plan-bits .text { border-left-color: var(--redline); }

.composer {
  border-top: 1px solid var(--ink);
  padding: 12px 14px 14px;
  background: var(--field);
}

.composer textarea {
  resize: vertical;
  min-height: 72px;
}

.composer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 8px;
}

.composer-status {
  margin: 0;
  font-size: 12px;
  color: var(--rule);
  min-height: 1.2em;
}

.preview-pane {
  grid-area: preview;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  background: var(--field);
}

.preview-toolbar {
  display: grid;
  gap: 6px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--rule);
}

.region-field {
  max-width: 16rem;
}

.region-field select {
  width: 100%;
  max-width: 16rem;
  text-overflow: ellipsis;
}

.preview-note {
  margin: 0;
  font-size: 12px;
  color: var(--cyan);
}

.preview-stage {
  flex: 1;
  min-height: 0;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  background: #fff;
}

.preview-stage img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
  border: 1px solid var(--ink);
  background: #fff;
  transform-origin: 0 0;
  will-change: transform;
  user-select: none;
  -webkit-user-drag: none;
}

.preview-stage.is-zoomed { cursor: grab; }
.preview-stage.is-panning { cursor: grabbing; }

.zoom-controls {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-left: 4px;
}

.zoom-controls .btn-ghost {
  min-width: 28px;
  padding: 2px 8px;
}

.preview-empty,
.preview-loading {
  color: var(--rule);
  padding: 24px;
}

.preview-loading {
  position: absolute;
  left: 12px;
  top: 12px;
  background: var(--field);
  border: 1px solid var(--ink);
  padding: 4px 10px;
  font-size: 12px;
  color: var(--ink);
  z-index: 2;
}

.preview-stage.is-waiting::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.28);
  pointer-events: none;
}


.preview-tools .btn-ghost.is-on {
  background: var(--ink);
  color: var(--paper);
}

.scene-view {
  position: absolute;
  inset: 12px;
  display: flex;
  align-items: stretch;
  justify-content: stretch;
  background: #fff;
  border: 1px solid var(--ink);
  overflow: hidden;
  z-index: 1;
}

.scene-view[hidden] { display: none !important; }

#scene-svg {
  width: 100%;
  height: 100%;
  display: block;
  background: #fff;
  touch-action: none;
  user-select: none;
}

.scene-stamp {
  position: absolute;
  right: 10px;
  top: 10px;
  z-index: 2;
  background: var(--field);
  border: 1px solid var(--ochre);
  color: var(--ink);
  font-size: 12px;
  padding: 3px 8px;
  pointer-events: none;
}

[hidden] { display: none !important; }

@media (max-width: 900px) {
  .workbench {
    grid-template-columns: 1fr;
    grid-template-rows: 56px auto 50vh 50vh;
    grid-template-areas:
      "top"
      "rail"
      "preview"
      "chat";
    height: auto;
    min-height: 100%;
  }
  .topbar { grid-template-columns: 1fr auto; }
  .brand { border-right: 0; }
  .topbar-project, .model-toggle { display: none; }
  .chat-pane { border-right: 0; border-top: 3px solid var(--cyan); }
}


.rail-actions {
  margin: 0 16px 14px;
}

.btn-new-session {
  width: 100%;
}

.project-list .pmeta.is-prep { color: var(--ochre); }
.project-list .pmeta.is-ready { color: var(--cyan); }
.project-list li button.is-prep { opacity: 1; }

.composer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: flex-end;
}

.session-panel {
  flex: 1;
  min-height: 0;
  padding: 32px 28px;
  overflow: auto;
}

.session-kicker {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--rule);
  text-transform: uppercase;
}

.session-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 650;
}

.session-copy {
  margin: 0 0 18px;
  color: var(--rule);
  max-width: 28em;
}

.upload-drop {
  display: flex;
  flex-direction: column;
  gap: 6px;
  justify-content: center;
  align-items: flex-start;
  min-height: 140px;
  padding: 20px 22px;
  border: 1px dashed var(--ink);
  background: var(--field);
  cursor: pointer;
  max-width: 28em;
}

.upload-drop.is-over {
  background: var(--paper);
  border-style: solid;
}

.init-steps {
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
  max-width: 28em;
}

.init-steps li {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid rgba(138, 154, 161, 0.35);
}

.init-steps .mark {
  width: 1.2em;
  height: 1.2em;
  flex: 0 0 1.2em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--rule);
  font-family: var(--font-display);
}

.init-steps li.is-done .mark { color: var(--cyan); }
.init-steps li.is-running .mark { color: var(--ochre); }
.init-steps li.is-error .mark { color: var(--redline); }

.mark.spin,
.pmeta.is-prep .spin {
  box-sizing: border-box;
  width: 0.85em;
  height: 0.85em;
  flex: 0 0 0.85em;
  margin: 0 0.15em;
  border: 2px solid rgba(138, 154, 161, 0.35);
  border-top-color: var(--ochre);
  border-radius: 50%;
  animation: init-spin 0.75s linear infinite;
  color: transparent;
  font-size: 0;
}

.pmeta.is-prep {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

@keyframes init-spin {
  to { transform: rotate(360deg); }
}

.init-progress-row {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 28em;
  margin: 0 0 12px;
}

.init-progress {
  flex: 1;
  height: 8px;
  background: rgba(138, 154, 161, 0.25);
  margin: 0;
  border-radius: 999px;
  overflow: hidden;
}

.init-bar {
  height: 100%;
  width: 0;
  background: var(--ochre);
  border-radius: 999px;
  transition: width 0.25s ease;
}

.init-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 8px 0 0;
}

.init-percent {
  flex: 0 0 auto;
  min-width: 5.5em;
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  color: var(--cyan);
}

.preview-tools {
  display: flex;
  gap: 6px;
  align-items: center;
}