/* ============================================================
   DocuScan design system
   Palette derived from assets/logo.svg:
     Brand blue  #3b82f6  (gradient start)
     Brand teal  #0ea5a4  (gradient end)
     Flag red    #ef4444  (red-flag accent)
     Ink         #0b3b5e  (deep navy)
     Paper       #eef2f7  (light surface)
   ============================================================ */

:root {
  --brand:        #2563eb;
  --brand-start:  #3b82f6;
  --brand-end:    #0ea5a4;
  --accent:       #0d9488;
  --ink:          #0b2540;
  --shadow-sm:    0 1px 2px rgba(11, 37, 64, 0.06), 0 1px 3px rgba(11, 37, 64, 0.10);
  --shadow-md:    0 4px 12px -2px rgba(11, 37, 64, 0.10), 0 2px 6px -2px rgba(11, 37, 64, 0.08);
  --shadow-lg:    0 24px 48px -16px rgba(11, 37, 64, 0.18), 0 8px 20px -12px rgba(11, 37, 64, 0.12);
  --ring:         0 0 0 4px rgba(37, 99, 235, 0.14);
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  font-family: 'Inter', ui-sans-serif, system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* Tighter, more confident headings */
h1, h2, h3 { letter-spacing: -0.02em; }

/* ---- Brand gradient helpers ---- */
.brand-gradient {
  background-image: linear-gradient(135deg, var(--brand-start) 0%, var(--brand-end) 100%);
}
.brand-gradient-text {
  background-image: linear-gradient(120deg, var(--brand-start) 0%, var(--brand-end) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---- Reusable buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  border-radius: 9999px;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
  cursor: pointer;
}
.btn:focus-visible { outline: none; box-shadow: var(--ring); }

.btn-primary {
  background-image: linear-gradient(135deg, var(--brand-start) 0%, var(--brand-end) 100%);
  color: #fff;
  box-shadow: var(--shadow-md);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow-lg); }

.btn-secondary {
  background: #fff;
  color: var(--ink);
  border: 1px solid #cbd5e1;
  box-shadow: var(--shadow-sm);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }

/* ---- Icon sizing ---- */
.icon { flex: none; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* Icon tile (feature cards / headings) */
.icon-tile {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  background-image: linear-gradient(135deg, var(--brand-start) 0%, var(--brand-end) 100%);
  box-shadow: var(--shadow-md);
}

/* ---- Cards ---- */
.card {
  background: #fff;
  border: 1px solid #e7edf3;
  border-radius: 1.25rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}
.lift:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: #d7e1ea;
}

/* ---- Scroll-reveal animation ---- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ---- Dashboard tab panels ---- */
.tab-panel { display: none; }
.tab-panel.active {
  display: block;
  animation: panelIn 0.35s ease both;
}
@keyframes panelIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---- Tab buttons ---- */
.tab-btn { transition: color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease; }
.tab-btn.active {
  background-image: linear-gradient(135deg, var(--brand-start) 0%, var(--brand-end) 100%);
  color: #fff;
  box-shadow: var(--shadow-md);
}

/* ---- Upload drop zone ---- */
.dropzone { transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease; }
.dropzone.dragover {
  border-color: var(--accent);
  background-color: rgba(13, 148, 136, 0.06);
  transform: scale(1.01);
}

/* ---- Circular safety gauge ----
   r=52 -> circumference 326.7. JS animates stroke-dashoffset. */
.gauge-ring {
  stroke-dasharray: 326.7;
  stroke-dashoffset: 326.7;
  transition: stroke-dashoffset 1.2s cubic-bezier(0.4, 0, 0.2, 1), stroke 0.5s ease;
  transform: rotate(-90deg);
  transform-origin: center;
}

/* ---- Fake analysis progress bar ---- */
.progress-bar { transition: width 0.3s ease; }

/* ---- Nav: active link underline ---- */
.nav-link { position: relative; }
.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background-image: linear-gradient(90deg, var(--brand-start), var(--brand-end));
  transition: width 0.25s ease;
}
.nav-link:hover::after,
.nav-link.active::after { width: 100%; }

/* ---- Compare view: highlight conflicting rows ---- */
.diff-conflict {
  background-color: rgba(239, 68, 68, 0.07);
  border-left: 3px solid #ef4444;
}
.diff-ok { border-left: 3px solid #10b981; }

/* ---- Toast ---- */
#toast { transition: opacity 0.3s ease, transform 0.3s ease; }
#toast.hidden-toast {
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
}

/* ---- Subtle section grid backdrop ---- */
.hero-grid {
  background-image:
    radial-gradient(60rem 40rem at 70% -10%, rgba(59, 130, 246, 0.10), transparent 60%),
    radial-gradient(50rem 40rem at 0% 20%, rgba(14, 165, 164, 0.08), transparent 55%);
}

/* ============================================================
   FEATURE EXPLORER (nav list + deep panel)
   ============================================================ */
.feat-btn {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  width: 100%;
  text-align: left;
  padding: 0.85rem 1rem;
  border-radius: 1rem;
  border: 1px solid #e7edf3;
  background: #fff;
  box-shadow: var(--shadow-sm);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
  cursor: pointer;
}
.feat-btn:hover { border-color: #cfe0ee; transform: translateY(-1px); }
.feat-btn.active {
  border-color: transparent;
  background-image: linear-gradient(135deg, rgba(59, 130, 246, 0.10), rgba(14, 165, 164, 0.10));
  box-shadow: var(--shadow-md);
}
.feat-chevron { margin-left: auto; color: #cbd5e1; transition: transform 0.2s ease, color 0.2s ease; }
.feat-btn.active .feat-chevron { color: var(--accent); transform: translateX(2px); }

.feat-panel { display: none; }
.feat-panel.active { display: block; animation: panelIn 0.35s ease both; }

/* ============================================================
   CONTRACT SHOWCASE, 3D cover-flow of annotated documents
   ============================================================ */
.cf-clip { overflow: hidden; }  /* clips fanned pages before they reach the panel */
.cf-stage {
  position: relative;
  height: 740px;  /* tall enough that the centered card's shadow fits, so the clip never slices it */
  perspective: 1800px;
  transform-style: preserve-3d;
}
.cf-slide {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 384px;
  height: 498px;                 /* 8.5 x 11 ratio (0.773) */
  margin: -249px 0 0 -192px;
  transition: transform 0.6s cubic-bezier(0.2, 0.7, 0.2, 1), opacity 0.6s ease, filter 0.6s ease;
  cursor: pointer;
  will-change: transform;
}
@media (max-width: 640px) {
  .cf-stage { height: 640px; }
  .cf-slide { width: 300px; height: 388px; margin: -194px 0 0 -150px; }
}

/* The document "page" itself */
.cf-doc {
  width: 100%;
  height: 100%;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 5px;
  box-shadow: var(--shadow-lg);
  padding: 30px 32px;
  overflow: hidden;
  font-family: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  color: #1f2937;
  font-size: 8.4px;
  line-height: 1.52;
  position: relative;
}
.cf-slide.is-active .cf-doc {
  /* Font size for the centered doc is set by JS (fitActive) so the whole page
     always fits without clipping, whatever the contract length. */
  box-shadow: 0 26px 50px -18px rgba(11, 37, 64, 0.30), 0 8px 18px -10px rgba(11, 37, 64, 0.16);
}
.cf-doc-inner { transform-origin: top center; }
@media (max-width: 640px) {
  .cf-doc { font-size: 6.6px; padding: 22px 24px; }
}

.doc-title {
  text-align: center;
  font-weight: 700;
  font-size: 1.5em;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  margin-bottom: 2px;
}
.doc-sub { text-align: center; font-size: 0.95em; color: #64748b; margin-bottom: 11px; }
.doc-recital { text-align: justify; margin-bottom: 8px; }
.doc-clause  { text-align: justify; margin-bottom: 6px; }
.doc-num, .doc-clause strong { font-weight: 700; color: #0f172a; }

/* Highlight bands, matched to the app's color logic */
mark.hl { border-radius: 2px; padding: 0.5px 1.5px; color: inherit; }
.hl-red   { background: #fecaca; box-shadow: inset 2.5px 0 0 #ef4444; }
.hl-amber { background: #fde68a; box-shadow: inset 2.5px 0 0 #f59e0b; }
.hl-green { background: #bbf7d0; box-shadow: inset 2.5px 0 0 #10b981; }

/* Signature block */
.doc-sig { display: flex; gap: 26px; margin-top: 18px; }
.sig-col { flex: 1; }
.sig-line { border-bottom: 1px solid #334155; height: 22px; }
.sig-label { font-size: 0.85em; color: #64748b; margin-top: 3px; }
.doc-foot { position: absolute; bottom: 10px; left: 0; right: 0; text-align: center; font-size: 0.8em; color: #94a3b8; letter-spacing: 0.08em; }

/* Type tag under the active document */
.cf-type {
  position: absolute;
  bottom: -34px;
  left: 50%;
  transform: translateX(-50%) translateY(6px);
  white-space: nowrap;
  font-family: 'Inter', sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  color: #fff;
  background-image: linear-gradient(135deg, var(--brand-start), var(--brand-end));
  padding: 5px 14px;
  border-radius: 9999px;
  box-shadow: var(--shadow-md);
  opacity: 0;
  transition: opacity 0.5s ease, transform 0.5s ease;
  pointer-events: none;
}
.cf-slide.is-active .cf-type { opacity: 1; transform: translateX(-50%) translateY(0); }

/* Controls */
.cf-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 9999px;
  background: #fff;
  border: 1px solid #e2e8f0;
  color: var(--ink);
  box-shadow: var(--shadow-md);
  transition: transform 0.18s ease, border-color 0.18s ease, color 0.18s ease;
  cursor: pointer;
}
.cf-btn:hover { transform: translateY(-1px); border-color: var(--accent); color: var(--accent); }
.cf-dot { width: 8px; height: 8px; border-radius: 9999px; background: #cbd5e1; transition: all 0.25s ease; cursor: pointer; }
.cf-dot.active { width: 26px; background-image: linear-gradient(90deg, var(--brand-start), var(--brand-end)); }

/* Results panel findings */
.cf-group-h {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}
.cf-group-h.red { color: #dc2626; }
.cf-group-h.amber { color: #d97706; }
.cf-group-h.green { color: #059669; }
.cf-count {
  margin-left: 4px;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 1px 8px;
  border-radius: 9999px;
  background: #f1f5f9;
  color: #475569;
}
.cf-item { font-size: 0.82rem; line-height: 1.35; padding: 7px 11px; border-radius: 9px; }
.red-item   { background: #fef2f2; color: #7f1d1d; border-left: 3px solid #ef4444; }
.amber-item { background: #fffbeb; color: #78350f; border-left: 3px solid #f59e0b; }
.green-item { background: #ecfdf5; color: #065f46; border-left: 3px solid #10b981; }