add welcome page and README.md

app/static/css/app.css

@@ -257,11 +257,152 @@ a {
   text-align: center;
 }
 
+.welcome-page {
+  margin: -2rem -1.5rem -3rem;
+  background: #f3f6f7;
+}
+
+.welcome-hero {
+  min-height: 78vh;
+  position: relative;
+  display: flex;
+  align-items: center;
+  isolation: isolate;
+  overflow: hidden;
+  padding: 7rem clamp(1.5rem, 6vw, 7rem) 5rem;
+  background: url("../img/welcome-hero.png") center / cover no-repeat;
+  color: #ffffff;
+}
+
+.welcome-hero::before {
+  content: "";
+  position: absolute;
+  inset: 0;
+  z-index: -1;
+  background: rgba(6, 15, 28, 0.58);
+}
+
+.welcome-nav {
+  position: absolute;
+  top: 1.5rem;
+  left: clamp(1.5rem, 6vw, 7rem);
+  right: clamp(1.5rem, 6vw, 7rem);
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 1rem;
+}
+
+.welcome-brand {
+  color: #ffffff;
+  font-size: 1.05rem;
+  font-weight: 700;
+  text-decoration: none;
+}
+
+.welcome-copy {
+  max-width: 760px;
+}
+
+.welcome-copy h1 {
+  margin: 0;
+  font-size: clamp(3rem, 7vw, 7rem);
+  font-weight: 800;
+  line-height: 0.95;
+}
+
+.welcome-copy p {
+  max-width: 660px;
+  margin: 1.4rem 0 0;
+  color: rgba(255, 255, 255, 0.86);
+  font-size: clamp(1.05rem, 1.5vw, 1.35rem);
+}
+
+.welcome-eyebrow {
+  color: rgba(255, 255, 255, 0.72);
+}
+
+.welcome-actions {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.85rem;
+  margin-top: 2rem;
+}
+
+.welcome-section,
+.workflow-band {
+  padding: clamp(3rem, 6vw, 5rem) clamp(1.5rem, 6vw, 7rem);
+}
+
+.welcome-section-header {
+  max-width: 760px;
+  margin-bottom: 1.5rem;
+}
+
+.welcome-section-header h2,
+.workflow-band h2 {
+  margin: 0;
+  font-size: clamp(2rem, 3vw, 3rem);
+}
+
+.feature-grid {
+  display: grid;
+  grid-template-columns: repeat(4, minmax(0, 1fr));
+  gap: 1rem;
+}
+
+.feature-card {
+  min-height: 250px;
+  padding: 1.25rem;
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  background: #ffffff;
+}
+
+.feature-card span {
+  color: var(--accent);
+  font-weight: 800;
+}
+
+.feature-card h3 {
+  margin: 2.5rem 0 0.75rem;
+  font-size: 1.15rem;
+}
+
+.feature-card p {
+  color: var(--muted);
+  margin: 0;
+}
+
+.workflow-band {
+  display: grid;
+  grid-template-columns: minmax(0, 0.75fr) minmax(320px, 1fr);
+  gap: 2rem;
+  align-items: start;
+  background: #172033;
+  color: #ffffff;
+}
+
+.workflow-band .eyebrow,
+.workflow-list {
+  color: rgba(255, 255, 255, 0.72);
+}
+
+.workflow-list {
+  display: grid;
+  gap: 1rem;
+  margin: 0;
+  padding-left: 1.25rem;
+  font-size: 1.05rem;
+}
+
 @media (max-width: 992px) {
   .stats-grid,
   .upload-grid,
   .detail-grid,
-  .kiosk-grid {
+  .kiosk-grid,
+  .feature-grid,
+  .workflow-band {
     grid-template-columns: 1fr 1fr;
   }
 }
@@ -276,11 +417,22 @@ a {
   .stats-grid,
   .upload-grid,
   .detail-grid,
-  .kiosk-grid {
+  .kiosk-grid,
+  .feature-grid,
+  .workflow-band {
     grid-template-columns: 1fr;
   }
 
   .detail-list {
     grid-template-columns: 1fr;
   }
+
+  .welcome-hero {
+    min-height: 82vh;
+    padding-top: 6rem;
+  }
+
+  .welcome-actions .btn {
+    width: 100%;
+  }
 }