@import url("https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700&display=swap");

:root {
  font-family: "Plus Jakarta Sans", system-ui, "Segoe UI", Roboto, sans-serif;
  --border: rgba(15, 23, 42, 0.1);
  --border-strong: rgba(15, 23, 42, 0.16);
  --bg: #eef2ff;
  --bg-accent: #e0e7ff;
  --surface: rgba(255, 255, 255, 0.88);
  --surface-solid: #ffffff;
  --text: #0f172a;
  --text-muted: #64748b;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-glow: rgba(79, 70, 229, 0.35);
  --sumup: #2563eb;
  --sumup-bg: rgba(37, 99, 235, 0.12);
  --danger: #dc2626;
  --danger-bg: rgba(220, 38, 38, 0.1);
  --warn: #b45309;
  --warn-bg: rgba(245, 158, 11, 0.14);
  --success-bg: #ecfdf5;
  --success-border: #6ee7b7;
  --success-text: #065f46;
  --error-bg: #fef2f2;
  --error-border: #fca5a5;
  --error-text: #991b1b;
  --nav-head-w: 13.35rem;
  --nav-head-h: 2.65rem;
  --nav-leaf-w: 16.2rem;
  --nav-leaf-h: 2.45rem;
  --nav-gap: 0.55rem;
  --nav-total-w: calc(var(--nav-head-w) + var(--nav-leaf-w) + var(--nav-gap));
  --nav-font: 0.92rem;
  --shell-half-h: 12rem;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08), 0 2px 6px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 20px 50px rgba(15, 23, 42, 0.12);
  --transition: 0.18s ease;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(ellipse 80% 60% at 10% -10%, rgba(99, 102, 241, 0.22), transparent 55%),
    radial-gradient(ellipse 70% 50% at 100% 0%, rgba(14, 165, 233, 0.14), transparent 50%),
    linear-gradient(165deg, var(--bg) 0%, #f8fafc 45%, var(--bg-accent) 100%);
}

main {
  min-height: 100vh;
  padding: 1.75rem 1.5rem 2.5rem;
  overflow-y: auto;
}

.page-wrap {
  width: min(1040px, 100%);
  margin: 0 auto;
}

.app-brand {
  margin-bottom: 1.35rem;
  padding: 0 0.15rem;
}

.app-brand h1 {
  margin: 0;
  font-size: 1.65rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
}

.app-tagline {
  margin: 0.35rem 0 0;
  font-size: 0.92rem;
  color: var(--text-muted);
  max-width: 36rem;
  line-height: 1.45;
}

.app-shell {
  display: grid;
  grid-template-columns: var(--nav-total-w) minmax(0, 1fr);
  gap: 1.5rem;
  align-items: start;
  width: 100%;
  margin-top: max(0.5rem, calc(50vh - var(--shell-half-h)));
}

.side-nav {
  position: relative;
  width: var(--nav-total-w);
  min-width: var(--nav-total-w);
  max-width: var(--nav-total-w);
  align-self: start;
  overflow: visible;
}

.nav-stack {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  width: var(--nav-head-w);
}

.nav-branch { display: block; }

.nav-branch-flyout {
  position: absolute;
  left: calc(var(--nav-head-w) + var(--nav-gap));
  width: var(--nav-leaf-w);
  min-width: var(--nav-leaf-w);
  max-width: var(--nav-leaf-w);
  padding-left: 0.75rem;
  visibility: hidden;
  pointer-events: none;
  z-index: 2;
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
}

.nav-branch-flyout.is-visible {
  visibility: visible;
  pointer-events: auto;
  opacity: 1;
  transform: translateX(0);
}

.nav-branch > summary {
  box-sizing: border-box;
  cursor: pointer;
  list-style: none;
  margin: 0;
  width: var(--nav-head-w);
  height: var(--nav-head-h);
  min-height: var(--nav-head-h);
  max-height: var(--nav-head-h);
  padding: 0.32rem 1.6rem 0.32rem 0.55rem;
  font-size: var(--nav-font);
  font-weight: 600;
  line-height: 1.25;
  text-align: center;
  color: var(--danger);
  background: var(--danger-bg);
  border: 1px solid rgba(220, 38, 38, 0.18);
  border-radius: var(--radius-md);
  user-select: none;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition);
  position: relative;
}

.nav-branch > summary::after {
  content: "";
  position: absolute;
  right: 0.55rem;
  top: 50%;
  width: 0.45rem;
  height: 0.45rem;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: translateY(-65%) rotate(45deg);
  opacity: 0.55;
  transition: transform var(--transition);
}

.nav-branch[open] > summary::after {
  transform: translateY(-35%) rotate(-135deg);
}

.nav-branch[open] > summary {
  box-shadow: var(--shadow-md);
}

.nav-branch > summary:hover {
  transform: translateY(-1px);
}

.nav-branch--sumup > summary {
  color: var(--sumup);
  background: var(--sumup-bg);
  border-color: rgba(37, 99, 235, 0.22);
}

.nav-branch > summary::-webkit-details-marker { display: none; }

.nav-branch-flyout::before {
  content: "";
  position: absolute;
  left: 0.15rem;
  top: 0.6rem;
  bottom: 0.6rem;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--accent), rgba(79, 70, 229, 0.15));
}

.nav-children {
  display: flex;
  flex-direction: column;
  gap: 0.32rem;
  padding: 0.35rem;
  background: var(--surface);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.nav-leaf {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  width: 100%;
  min-height: var(--nav-leaf-h);
  text-align: center;
  padding: 0.38rem 0.65rem;
  margin: 0;
  border: 1px solid transparent;
  background: var(--surface-solid);
  font-family: inherit;
  font-size: var(--nav-font);
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  border-radius: var(--radius-sm);
  line-height: 1.3;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition), color var(--transition);
}

.nav-leaf::before {
  content: "";
  position: absolute;
  left: -0.62rem;
  top: 50%;
  width: 0.55rem;
  height: 1px;
  background: var(--border-strong);
}

.nav-leaf:hover:not(:disabled) {
  background: #f8fafc;
  border-color: var(--border);
}

.nav-leaf.is-selected {
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.12), rgba(99, 102, 241, 0.06));
  color: var(--accent);
  border-color: rgba(79, 70, 229, 0.28);
  box-shadow: inset 3px 0 0 var(--accent);
}

.nav-leaf--todo,
.nav-leaf:disabled {
  color: var(--text-muted);
  cursor: not-allowed;
  background: #f8fafc;
  border-color: var(--border);
}

.nav-todo-tag {
  display: inline-block;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--warn);
  background: var(--warn-bg);
  border-radius: 999px;
  padding: 0.12em 0.45em;
  margin-left: 0.35em;
  vertical-align: middle;
}

.main-panel {
  min-width: 0;
  max-width: 26rem;
  width: 100%;
  align-self: start;
}

.card {
  background: var(--surface);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.65);
  border-radius: var(--radius-lg);
  padding: 1.35rem 1.4rem 1.5rem;
  box-shadow: var(--shadow-lg);
}

.card-actions {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 1rem;
}

.panel-hint {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.75rem 0.9rem;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.08), rgba(14, 165, 233, 0.06));
  border: 1px solid rgba(79, 70, 229, 0.14);
}

.panel-hint-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.panel-hint-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.35;
}

.panel-hint-value.is-empty {
  font-weight: 500;
  color: var(--text-muted);
}

.file-drop {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 1.15rem 1rem;
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius-md);
  background: rgba(248, 250, 252, 0.85);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
  text-align: center;
}

.file-drop:hover,
.file-drop.is-dragover {
  border-color: var(--accent);
  background: rgba(238, 242, 255, 0.95);
  box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.file-drop input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.file-drop-icon {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  background: linear-gradient(135deg, var(--accent), #6366f1);
  color: #fff;
  box-shadow: 0 4px 12px var(--accent-glow);
}

.file-drop-text {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
  max-width: 100%;
  word-break: break-word;
}

.file-drop-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.ocr-isd-section {
  padding-top: 0.25rem;
  border-top: 1px solid var(--border);
  animation: fadeSlideIn 0.22s ease;
}

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.ocr-isd-section-title {
  margin: 0.65rem 0 0.75rem;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.ocr-isd-panel {
  display: grid;
  gap: 0.65rem;
}

.ocr-isd-panel label {
  display: block;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
}

.ocr-isd-panel input[type="text"] {
  display: block;
  width: 100%;
  margin-top: 0.35rem;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.9rem;
  color: var(--text);
  background: var(--surface-solid);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.ocr-isd-panel input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.card-actions button#btnConvert {
  width: 100%;
  align-self: stretch;
  background: linear-gradient(135deg, var(--accent) 0%, #6366f1 100%);
  color: #fff;
  border: none;
  padding: 0.78rem 1.25rem;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 6px 20px var(--accent-glow);
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

.card-actions button#btnConvert:hover:not(:disabled) {
  transform: translateY(-1px);
  filter: brightness(1.03);
  box-shadow: 0 10px 28px var(--accent-glow);
}

.card-actions button#btnConvert:active:not(:disabled) {
  transform: translateY(0);
}

.card-actions button#btnConvert:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
}

#status {
  margin: 0;
  padding: 0.7rem 0.9rem;
  border-radius: var(--radius-md);
  font-size: 0.86rem;
  line-height: 1.4;
  display: none;
}

#status.err {
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  color: var(--error-text);
  display: block;
}

#status.ok {
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  color: var(--success-text);
  display: block;
}

@media (max-width: 720px) {
  .app-shell {
    grid-template-columns: 1fr;
    margin-top: 0;
  }

  .side-nav {
    width: 100%;
    min-width: 0;
    max-width: 100%;
  }

  .nav-stack { width: 100%; }

  .nav-branch > summary {
    width: 100%;
    max-width: 100%;
  }

  .nav-branch-flyout {
    position: static;
    left: auto;
    width: 100%;
    min-width: 0;
    max-width: 100%;
    padding-left: 0;
    margin-top: 0.35rem;
    transform: none;
    opacity: 1;
  }

  .nav-branch-flyout::before { display: none; }

  .nav-leaf::before { display: none; }

  .main-panel { max-width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}