:root {
  --black: #000000;
  --panel: #050505;
  --line: #242424;
  --line-soft: #171717;
  --line-strong: #3d3d3d;
  --white: #f2f2f2;
  --dim: #7c7c7c;
  --dim-2: #4a4a4a;
  --font-display: 'JetBrains Mono', 'Courier New', monospace;
  --font-mono: 'Share Tech Mono', 'JetBrains Mono', monospace;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--black);
  color: var(--white);
  font-family: var(--font-mono);
  min-height: 100%;
}

body {
  min-height: 100vh;
}

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

button {
  cursor: pointer;
}

/* ---------- CRT overlay ---------- */

.crt-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
  background:
    repeating-linear-gradient(
      0deg,
      rgba(255, 255, 255, 0.03) 0px,
      rgba(255, 255, 255, 0.03) 1px,
      transparent 1px,
      transparent 3px
    ),
    radial-gradient(ellipse at center, rgba(0, 0, 0, 0) 55%, rgba(0, 0, 0, 0.6) 100%);
  mix-blend-mode: overlay;
  opacity: 0.55;
}

@keyframes blink {
  0%, 45% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

.cursor {
  display: inline-block;
  margin-left: 1px;
  animation: blink 1s steps(1) infinite;
}

/* ---------- shell / window chrome ---------- */

.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  margin: 10px;
}

.title-bar {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--dim);
}

.app-body {
  flex: 1;
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 0;
}

/* ---------- sidebar (continuous log, no cards) ---------- */

.sidebar {
  border-right: 1px solid var(--line);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 0;
  overflow-y: auto;
  font-size: 0.82rem;
}

.upload-zone {
  border: 1px dashed var(--line-strong);
  padding: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  margin-bottom: 4px;
  transition: border-color 0.12s ease;
}

.upload-zone:hover {
  border-color: var(--white);
}

.upload-zone-icon {
  width: 30px;
  height: 30px;
  flex: none;
  display: grid;
  place-items: center;
  background: var(--white);
  color: var(--black);
  font-weight: 700;
  font-size: 1.05rem;
}

.upload-zone-text {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.upload-zone-text strong {
  font-family: var(--font-display);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
}

.upload-zone-text small {
  color: var(--dim);
  font-size: 0.72rem;
}

.rule {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 18px 0 10px;
  color: var(--dim-2);
  font-family: var(--font-display);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
}

.rule::before {
  content: "";
  flex: none;
  width: 10px;
  border-top: 1px solid var(--line);
}

.rule::after {
  content: "";
  flex: 1;
  border-top: 1px solid var(--line);
}

.log-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 5px 0;
  border-bottom: 1px dotted var(--line-soft);
}

.log-row:last-of-type {
  border-bottom: 0;
}

.log-key {
  color: var(--dim);
}

.log-val {
  color: var(--white);
  text-align: right;
  max-width: 150px;
  word-break: break-word;
}

.log-key-bracket {
  font-family: var(--font-display);
  font-size: 0.74rem;
  letter-spacing: 0.03em;
  color: var(--dim);
}

.sidebar-spacer {
  flex: 1;
}

.prompt-line {
  padding-top: 14px;
  border-top: 1px solid var(--line);
  color: var(--dim);
  font-size: 0.78rem;
}

/* ---------- viewer area ---------- */

.viewer-area {
  display: grid;
  grid-template-rows: auto 1fr;
  min-height: 0;
  overflow: hidden;
}

.topbar {
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  background: var(--panel);
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.tool-btn {
  background: transparent;
  border: 0;
  color: var(--dim);
  font-family: var(--font-display);
  font-size: 0.74rem;
  letter-spacing: 0.03em;
  padding: 8px 6px;
  transition: color 0.12s ease;
}

.tool-btn:hover:not(:disabled) {
  color: var(--white);
}

.tool-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.tool-btn-icon {
  min-width: 40px;
  text-align: center;
}

.page-box {
  border: 1px solid var(--line);
  padding: 7px 10px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--dim);
}

.page-box input {
  width: 42px;
  background: transparent;
  border: 0;
  color: var(--white);
  outline: none;
  text-align: right;
}

.tool-stat {
  min-width: 48px;
  text-align: center;
  color: var(--dim);
  font-size: 0.76rem;
}

/* ---------- viewer panel ---------- */

.viewer-panel {
  position: relative;
  overflow: auto;
  background: var(--black);
}

.dropzone {
  min-height: 100%;
  transition: background 0.15s ease;
}

.dropzone.dragover {
  background: var(--panel);
}

.empty-state {
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: 30px;
}

.empty-frame {
  position: relative;
  width: min(540px, 100%);
  min-height: 280px;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 32px;
  gap: 4px;
}

.dropzone.dragover .empty-frame .corner {
  border-color: var(--white);
}

.empty-glyph {
  font-size: 1.8rem;
  color: var(--dim-2);
  margin-bottom: 8px;
}

.empty-frame h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.empty-frame p {
  margin: 0;
  color: var(--dim);
  max-width: 380px;
  font-size: 0.82rem;
  line-height: 1.5;
}

/* ---------- corner reticle (signature element) ---------- */

.canvas-wrap {
  position: relative;
  display: flex;
  justify-content: center;
  padding: 44px;
}

.corner {
  position: absolute;
  width: 16px;
  height: 16px;
  border: 1px solid var(--line-strong);
  transition: border-color 0.15s ease;
}

.corner-tl {
  top: 12px;
  left: 12px;
  border-right: 0;
  border-bottom: 0;
}

.corner-tr {
  top: 12px;
  right: 12px;
  border-left: 0;
  border-bottom: 0;
}

.corner-bl {
  bottom: 12px;
  left: 12px;
  border-right: 0;
  border-top: 0;
}

.corner-br {
  bottom: 12px;
  right: 12px;
  border-left: 0;
  border-top: 0;
}

#pdf-canvas {
  max-width: 100%;
  height: auto;
  background: white;
}

.hidden {
  display: none !important;
}

/* ---------- responsive ---------- */

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

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
}

@media (max-width: 640px) {
  .app-shell {
    margin: 0;
    border-left: 0;
    border-right: 0;
  }

  .topbar,
  .sidebar {
    padding: 14px;
  }
}