:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #eef4fb;
  color: #101827;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    linear-gradient(rgba(41, 104, 154, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(41, 104, 154, 0.08) 1px, transparent 1px),
    #eef4fb;
  background-size: 28px 28px;
}

button,
input {
  font: inherit;
}

.svg-sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.icon,
.section-icon,
.upload-icon {
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon {
  width: 16px;
  height: 16px;
}

.section-icon {
  width: 17px;
  height: 17px;
  color: #0b7fb3;
}

.upload-icon {
  width: 23px;
  height: 23px;
  color: #6be2ff;
}

button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  border: 1px solid #0f172a;
  background: #0f172a;
  color: #fff;
  min-height: 44px;
  padding: 0 16px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 650;
  box-shadow: 0 8px 18px rgba(15, 23, 42, 0.14);
}

button span,
.download-btn span {
  white-space: nowrap;
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.app {
  width: min(100%, 460px);
  min-height: 100vh;
  margin: 0 auto;
  padding: max(18px, env(safe-area-inset-top)) 14px max(22px, env(safe-area-inset-bottom));
}

.topbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
  gap: 12px;
  margin-bottom: 12px;
  padding: 16px 14px;
  border: 1px solid rgba(107, 226, 255, 0.28);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(15, 23, 42, 0.98), rgba(19, 37, 54, 0.96)),
    #0f172a;
  box-shadow: 0 18px 42px rgba(10, 22, 38, 0.18);
}

h1 {
  margin: 0;
  color: #f8fbff;
  font-size: 23px;
  line-height: 1.08;
  letter-spacing: 0;
  white-space: nowrap;
}

p {
  margin: 0;
  color: #9eb8c9;
  font-size: 12px;
  text-align: right;
}

.status-block p {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.status-block p::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: #20d6a4;
  box-shadow: 0 0 12px rgba(32, 214, 164, 0.9);
}

.status-block {
  display: grid;
  justify-items: end;
  gap: 5px;
  min-width: 0;
}

.user-bar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
  color: #b7c9d7;
  font-size: 12px;
  max-width: 172px;
}

.user-bar span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.user-bar button {
  flex: 0 0 auto;
  min-height: 28px;
  padding: 0 10px;
  border-color: rgba(120, 216, 255, 0.28);
  background: rgba(255, 255, 255, 0.08);
  color: #e6f7ff;
  font-size: 12px;
  font-weight: 600;
  box-shadow: none;
}

.history-card {
  display: grid;
  gap: 12px;
}

#refreshHistoryBtn {
  min-height: 32px;
  padding: 0 12px;
  border-color: #c8d7e6;
  background: #f7fbff;
  color: #17334d;
  font-size: 12px;
  font-weight: 600;
  box-shadow: none;
}

.account-panel {
  display: flex;
  justify-content: center;
  padding: 12px 0 2px;
}

#logoutBtn {
  min-height: 38px;
  padding: 0 14px;
  border-color: transparent;
  background: transparent;
  color: #5f6f83;
  font-size: 12px;
  font-weight: 600;
  box-shadow: none;
}

.history-list {
  display: grid;
  gap: 8px;
}

.history-empty {
  color: #647180;
  font-size: 13px;
}

.history-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px;
  column-gap: 10px;
  width: 100%;
  min-height: 0;
  padding: 12px;
  border: 1px solid #d8e5f0;
  border-radius: 8px;
  background: linear-gradient(180deg, #ffffff, #f8fbff);
  color: #101827;
  text-align: left;
  font-weight: 400;
  box-shadow: none;
}

.history-icon {
  grid-row: 1 / span 2;
  align-self: center;
  width: 18px;
  height: 18px;
  color: #0b7fb3;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.history-item strong {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 14px;
  line-height: 1.3;
}

.history-item span {
  color: #647180;
  font-size: 12px;
}

.tip-bar {
  border: 1px solid rgba(14, 116, 144, 0.16);
  border-radius: 8px;
  padding: 9px 10px;
  background: rgba(232, 248, 255, 0.72);
  color: #31556f;
  font-size: 12px;
  line-height: 1.45;
}

.selection-note {
  color: #31556f;
  font-size: 12px;
  line-height: 1.4;
}

.busy-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(6, 18, 32, 0.34);
  backdrop-filter: blur(2px);
}

.busy-card {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 148px;
  min-height: 52px;
  padding: 0 16px;
  border: 1px solid rgba(107, 226, 255, 0.3);
  border-radius: 8px;
  background: rgba(15, 23, 42, 0.94);
  color: #e6f7ff;
  box-shadow: 0 20px 50px rgba(6, 18, 32, 0.28);
}

.busy-spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(107, 226, 255, 0.25);
  border-top-color: #6be2ff;
  border-radius: 999px;
  animation: spin 0.8s linear infinite;
}

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

.hidden {
  display: none !important;
}

.panel {
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid #d8e5f0;
  border-radius: 8px;
  padding: 12px;
  box-shadow: 0 10px 28px rgba(21, 40, 62, 0.08);
}

.panel-head strong {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.upload {
  display: grid;
  gap: 12px;
}

.upload-panel {
  border-color: #b9d9eb;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(244, 250, 255, 0.98)),
    #fff;
}

.file-input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.upload-picker {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "mark title"
    "mark summary";
  align-items: center;
  column-gap: 12px;
  min-height: 82px;
  padding: 14px;
  border: 1px solid #9ecde7;
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(232, 248, 255, 0.95), rgba(255, 255, 255, 0.98)),
    #fff;
  cursor: pointer;
}

.upload-picker::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px dashed rgba(19, 108, 155, 0.32);
  border-radius: 6px;
  pointer-events: none;
}

.upload-mark {
  display: grid;
  place-items: center;
  grid-area: mark;
  position: relative;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(17, 147, 205, 0.42);
  border-radius: 8px;
  background: #0f172a;
  box-shadow: 0 10px 20px rgba(18, 120, 172, 0.18);
}

.upload-title {
  grid-area: title;
  color: #101827;
  font-size: 16px;
  font-weight: 750;
  line-height: 1.2;
}

.upload-summary {
  grid-area: summary;
  overflow: hidden;
  color: #557086;
  font-size: 12px;
  line-height: 1.4;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.login-form {
  display: grid;
  gap: 12px;
}

.login-form input,
.upload input {
  width: 100%;
  min-height: 44px;
  border: 1px solid #d4dde8;
  border-radius: 8px;
  padding: 9px 11px;
  background: #fbfcfe;
  color: #111827;
}

.upload button[type="submit"] {
  min-height: 50px;
  border-color: #0f172a;
  background:
    linear-gradient(135deg, #0f172a 0%, #17334d 62%, #0b7fb3 100%),
    #0f172a;
  box-shadow: 0 14px 28px rgba(11, 127, 179, 0.22);
}

.login-form button[type="submit"] {
  background:
    linear-gradient(135deg, #0f172a, #17334d),
    #0f172a;
}

.workspace {
  display: grid;
  gap: 12px;
}

.steps {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
  padding: 8px 0;
  background: #eef4fb;
}

.steps button {
  flex-direction: row;
  gap: 4px;
  min-height: 40px;
  padding: 0 5px;
  border-color: #d4dde8;
  background: #fff;
  color: #111827;
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}

.steps .icon {
  width: 14px;
  height: 14px;
}

.steps span {
  line-height: 1;
}

.steps button.active {
  border-color: #111827;
  background: #111827;
  color: #fff;
}

.step-panel {
  display: grid;
  gap: 12px;
}

.panel-head,
.action-bar {
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-head {
  justify-content: space-between;
}

.panel-head span {
  color: #5f6f83;
  font-size: 13px;
}

.action-bar {
  flex-wrap: nowrap;
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: none;
}

.action-bar::-webkit-scrollbar {
  display: none;
}

.action-bar button,
.download-btn {
  flex: 1 0 auto;
  min-width: max-content;
  white-space: nowrap;
}

.action-bar button:not(:last-child),
#chooseQuestionsBtn,
#selectAll,
#clearAll,
#mergeBtn,
#resetBtn,
#backAdjustBtn {
  background: #fff;
  color: #111827;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid #111827;
  border-radius: 8px;
  background: #111827;
  color: #fff;
  text-decoration: none;
  font-weight: 650;
}

.download-btn.secondary {
  background: #fff;
  color: #111827;
}

.select-tools {
  position: sticky;
  top: 56px;
  z-index: 9;
  display: grid;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid #eef2f6;
  background: #fff;
}

.page-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
}

.page-tab {
  flex: 0 0 auto;
  min-height: 38px;
  border-color: #d4dde8;
  background: #fff;
  color: #111827;
  white-space: nowrap;
  font-weight: 600;
}

.page-tab.active {
  border-color: #111827;
  background: #111827;
  color: #fff;
}

.page-stack {
  display: grid;
  gap: 12px;
}

.page-card {
  display: grid;
  gap: 6px;
}

.page-title {
  color: #5f6f83;
  font-size: 13px;
}

.page-canvas {
  position: relative;
  width: 100%;
  overflow: hidden;
  border: 1px solid #dce4ee;
  border-radius: 8px;
  background: #fff;
  touch-action: pan-y;
}

.page-canvas img {
  display: block;
  width: 100%;
  height: auto;
}

.region-box {
  position: absolute;
  border: 2px solid #2563eb;
  background: rgba(37, 99, 235, 0.08);
  color: #1d4ed8;
  min-width: 26px;
  min-height: 26px;
  padding: 3px 5px;
  border-radius: 4px;
  font-size: 12px;
  line-height: 1;
  touch-action: none;
  user-select: none;
}

.select-box {
  touch-action: pan-y;
}

.adjust-box {
  touch-action: none;
}

.region-box.selected {
  border-color: #059669;
  background: rgba(5, 150, 105, 0.14);
  color: #047857;
}

.region-box.active {
  border-color: #dc2626;
  background: rgba(220, 38, 38, 0.12);
  color: #991b1b;
  z-index: 4;
}

.handle {
  position: absolute;
  width: 26px;
  height: 26px;
  border: 2px solid #dc2626;
  border-radius: 999px;
  background: #fff;
  z-index: 5;
  touch-action: none;
}

.handle.nw {
  left: -14px;
  top: -14px;
}

.handle.n {
  left: 50%;
  top: -14px;
  transform: translateX(-50%);
}

.handle.ne {
  right: -14px;
  top: -14px;
}

.handle.e {
  right: -14px;
  top: 50%;
  transform: translateY(-50%);
}

.handle.se {
  right: -14px;
  bottom: -14px;
}

.handle.s {
  left: 50%;
  bottom: -14px;
  transform: translateX(-50%);
}

.handle.sw {
  left: -14px;
  bottom: -14px;
}

.handle.w {
  left: -14px;
  top: 50%;
  transform: translateY(-50%);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  overflow: visible;
  padding-bottom: 0;
}

.chip {
  flex: 0 0 auto;
  border: 1px solid #d4dde8;
  background: #fff;
  color: #111827;
  min-height: 38px;
  padding: 0 10px;
  border-radius: 999px;
  font-weight: 600;
}

.chip.selected {
  border-color: #059669;
  color: #047857;
  background: rgba(5, 150, 105, 0.08);
}

.pdf-preview {
  width: 100%;
  min-height: 72vh;
  border: 1px solid #dce4ee;
  border-radius: 8px;
  background: #fff;
}

@media (min-width: 820px) {
  .app {
    width: min(100%, 720px);
    padding-left: 22px;
    padding-right: 22px;
  }

  .upload,
  .login-form {
    grid-template-columns: 1fr auto;
    align-items: center;
  }

  .login-form {
    grid-template-columns: 1fr 1fr auto;
  }
}