revamp UI/UX with dark design system and modern layoutv2

Replace Bootstrap color utilities and legacy layout patterns with a
cohesive dark-mode design system. Key changes:

- CSS: full rewrite using custom property tokens (--bg, --surface,
  --accent, --text-muted, etc.), Inter font, glassmorphism modals
  (backdrop-filter + semi-transparent backgrounds), and a fixed
  pill-bar metric selector centered at the bottom of the viewport
- Navbar: unified nav-icon-btn style for all icon buttons, removed
  the gradient-toggle collapse button, settings dropdown aligned end
- Metric bar: promoted from Bootstrap collapse to always-visible
  fixed pill bar; metric-btn replaces btn; active-metric pre-applied
  to match default currentMetric
- Modals: removed inline bg overrides, h4 → h5, custom close buttons
  (nav-icon-btn + SVG), btn-modal-primary / btn-modal-ghost / ref-btn
  replace Bootstrap color variants
- Dropped Font Awesome dependency (all icons are inline SVGs)

1 files changed, 385 insertions, 88 deletions

diff --git a/assets/css/app.css b/assets/css/app.css
index af5e95c..d5b2f84 100644
--- a/assets/css/app.css
+++ b/assets/css/app.css
@@ -1,145 +1,442 @@
-html {
+@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&display=swap');
+
+/* ── Design tokens ───────────────────────────────────────────────────── */
+:root {
+	--bg:          #0d0d14;
+	--surface:     #13131e;
+	--surface-2:   #1c1c2a;
+	--surface-3:   #252535;
+	--border:      rgba(255, 255, 255, 0.08);
+	--border-2:    rgba(255, 255, 255, 0.14);
+	--accent:      #24ab48;
+	--accent-dim:  rgba(36, 171, 72, 0.14);
+	--accent-glow: rgba(36, 171, 72, 0.25);
+	--text:        #e2e2ef;
+	--text-muted:  #5e5e78;
+	--text-soft:   #9898b0;
+	--danger:      #ef4444;
+	--danger-dim:  rgba(239, 68, 68, 0.12);
+	--nav-h:       52px;
+	--radius-sm:   6px;
+	--radius:      10px;
+	--radius-lg:   14px;
+	--radius-pill: 100px;
+	--shadow-sm:   0 2px 8px rgba(0, 0, 0, 0.4);
+	--shadow:      0 8px 32px rgba(0, 0, 0, 0.5);
+	--shadow-lg:   0 24px 64px rgba(0, 0, 0, 0.7);
+}
+
+/* ── Reset ───────────────────────────────────────────────────────────── */
+*, *::before, *::after { box-sizing: border-box; }
+
+html, body {
 	height: 100%;
 	margin: 0;
+	background: var(--bg);
+	color: var(--text);
+	font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
+	font-size: 14px;
+	line-height: 1.5;
+	-webkit-font-smoothing: antialiased;
+	-moz-osx-font-smoothing: grayscale;
 }
 
-body {
-	background: #161616;
+a { text-decoration: none; color: inherit; }
+
+/* Bootstrap resets we override */
+.btn { border-radius: var(--radius-sm) !important; }
+.modal-content { border-radius: var(--radius-lg) !important; }
+
+/* ── Navbar ──────────────────────────────────────────────────────────── */
+.navbar {
+	height: var(--nav-h);
+	min-height: var(--nav-h);
+	padding: 0 20px;
+	background: rgba(13, 13, 20, 0.9);
+	backdrop-filter: blur(20px);
+	-webkit-backdrop-filter: blur(20px);
+	border-bottom: 1px solid var(--border);
+	position: sticky;
+	top: 0;
+	z-index: 1000;
+	margin-bottom: 0;
 }
 
-a,
-.fa-question-circle {
-	text-decoration: none;
+.navbar-brand {
+	font-size: 14px;
+	font-weight: 600;
+	letter-spacing: 0.02em;
+	color: var(--text) !important;
+	opacity: 0.9;
 }
 
-.btn,
-.nav-link,
-.dropdown-menu,
-.dropdown-item,
-.modal-content {
-	border-radius: 0;
+.navbar-nav {
+	gap: 4px;
+	align-items: center;
 }
 
-.navbar {
-	background: #161616;
-	margin-bottom: 0;
+/* ── Navbar icon buttons ─────────────────────────────────────────────── */
+.nav-icon-btn {
+	width: 36px;
+	height: 36px;
+	padding: 0;
+	display: flex;
+	align-items: center;
+	justify-content: center;
+	background: transparent;
+	border: 1px solid transparent;
+	border-radius: var(--radius-sm) !important;
+	color: var(--text-muted);
+	transition: background 0.15s, color 0.15s, border-color 0.15s;
+	cursor: pointer;
+}
+
+.nav-icon-btn svg path { fill: currentColor; }
+.navbar path { fill: currentColor; }
+
+.nav-icon-btn:hover {
+	background: var(--surface-2);
+	border-color: var(--border);
+	color: var(--text);
+}
+
+.nav-icon-btn:focus-visible {
+	outline: 2px solid var(--accent);
+	outline-offset: 2px;
+}
+
+/* ── Dropdown ────────────────────────────────────────────────────────── */
+.dropdown-menu {
+	background: var(--surface) !important;
+	border: 1px solid var(--border-2) !important;
+	border-radius: var(--radius) !important;
+	padding: 6px !important;
+	box-shadow: var(--shadow) !important;
+	min-width: 160px;
+}
+
+.dropdown-item {
+	border-radius: var(--radius-sm) !important;
+	padding: 9px 12px !important;
+	font-size: 13px;
+	font-weight: 500;
+	color: var(--text-soft) !important;
+	transition: background 0.12s, color 0.12s;
+}
+
+.dropdown-item:hover, .dropdown-item:focus {
+	background: var(--surface-2) !important;
+	color: var(--text) !important;
 }
 
-.modal-title path,
-.navbar path {
-	fill: white;
+/* ── Navbar toggler (mobile) ─────────────────────────────────────────── */
+.navbar-toggler {
+	border: 1px solid var(--border) !important;
+	border-radius: var(--radius-sm) !important;
+	padding: 6px 10px;
 }
 
-#settings-icon {
-	fill: black;
+.navbar-toggler-icon {
+	background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28226,226,239,0.75%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e") !important;
 }
 
+/* ── Map container ───────────────────────────────────────────────────── */
+#map-container {
+	height: calc(100vh - var(--nav-h));
+	width: 100%;
+	background: var(--bg);
+	position: relative;
+}
+
+/* ── Metric pill bar ─────────────────────────────────────────────────── */
+#gbar {
+	position: fixed;
+	bottom: 28px;
+	left: 50%;
+	transform: translateX(-50%);
+	display: flex !important;
+	align-items: center;
+	gap: 3px;
+	padding: 5px;
+	background: rgba(19, 19, 30, 0.94);
+	backdrop-filter: blur(20px);
+	-webkit-backdrop-filter: blur(20px);
+	border: 1px solid var(--border-2);
+	border-radius: var(--radius-pill);
+	box-shadow: var(--shadow), 0 2px 8px rgba(0, 0, 0, 0.4);
+	z-index: 500;
+	white-space: nowrap;
+	/* allow horizontal scroll on very small screens */
+	max-width: calc(100vw - 32px);
+	overflow-x: auto;
+	scrollbar-width: none;
+}
+
+#gbar::-webkit-scrollbar { display: none; }
+
+.metric-btn {
+	padding: 7px 18px;
+	border: none;
+	border-radius: var(--radius-pill);
+	background: transparent;
+	color: var(--text-muted);
+	font-family: inherit;
+	font-size: 12px;
+	font-weight: 500;
+	letter-spacing: 0.025em;
+	cursor: pointer;
+	transition: background 0.15s, color 0.15s;
+	white-space: nowrap;
+}
+
+.metric-btn:hover {
+	background: var(--surface-3);
+	color: var(--text-soft);
+}
+
+.metric-btn.active-metric {
+	background: var(--accent);
+	color: #000;
+	font-weight: 600;
+}
+
+/* ── Tooltip ─────────────────────────────────────────────────────────── */
+.map-tooltip {
+	position: fixed;
+	background: rgba(13, 13, 20, 0.96);
+	color: var(--text);
+	padding: 9px 14px;
+	border: 1px solid var(--border-2);
+	border-radius: var(--radius);
+	pointer-events: none;
+	font-size: 13px;
+	font-weight: 500;
+	font-family: 'Inter', system-ui, sans-serif;
+	opacity: 0;
+	transition: opacity 0.1s;
+	z-index: 9999;
+	box-shadow: var(--shadow);
+}
+
+/* ── Modals ──────────────────────────────────────────────────────────── */
 .modal-content {
-	border: 1px solid #fff;
+	background: rgba(13, 13, 20, 0.98) !important;
+	border: 1px solid var(--border-2) !important;
+	border-radius: var(--radius-lg) !important;
+	overflow: hidden;
+	box-shadow: var(--shadow-lg);
+	color: var(--text);
+	backdrop-filter: blur(24px);
+	-webkit-backdrop-filter: blur(24px);
 }
 
 .modal-header {
-	background-color: #24ab48;
-	border-bottom: #000;
-	color: white;
+	background: transparent !important;
+	border-bottom: 1px solid var(--border) !important;
+	padding: 20px 24px;
+}
+
+.modal-title {
+	font-size: 15px !important;
+	font-weight: 600;
+	color: var(--text) !important;
+	letter-spacing: 0.01em;
+}
+
+/* Country modal — accent title */
+#country-modal-title {
+	color: var(--accent) !important;
+}
+
+.modal-body {
+	background: transparent !important;
+	padding: 24px !important;
+	color: var(--text);
 }
 
-.modal-body,
 .modal-footer {
-	background-color: #000;
-	color: #ffffff;
+	background: transparent !important;
+	border-top: 1px solid var(--border) !important;
+	padding: 16px 24px !important;
+	gap: 8px;
 }
 
-.alert {
-	background-color: rgb(66, 133, 244);
-	background-color: rgba(66, 133, 244, 0.5);
-	color: #ffffff;
-	margin: 1.5rem auto;
-	width: 90%;
+/* Modal body typography */
+.modal-body p {
+	margin-bottom: 14px;
+	font-size: 14px;
+	line-height: 1.7;
 }
 
-#gradientbtn {
-	background-color: #9966ff;
-	color: #ffffff;
+.modal-body p:last-child { margin-bottom: 0; }
+
+.modal-body p b {
+	color: var(--text-soft);
+	font-weight: 500;
+	margin-right: 4px;
 }
 
-#totPop,
-#perCapita,
-#women,
-#juveniles,
-#occupancy {
-	background-color: #9966ff;
-	color: #ffffff;
-	margin: 5px;
-	padding: 10px;
+.modal-body hr {
+	border: none;
+	border-top: 1px solid var(--border);
+	margin: 20px 0;
+}
+
+/* ── Modal buttons ───────────────────────────────────────────────────── */
+.btn-modal-primary {
+	padding: 9px 20px;
+	background: var(--accent);
+	color: #000;
+	border: none;
+	border-radius: var(--radius-sm) !important;
+	font-family: inherit;
+	font-size: 13px;
+	font-weight: 600;
+	cursor: pointer;
+	transition: opacity 0.15s;
+}
+
+.btn-modal-primary:hover { opacity: 0.85; }
+
+.btn-modal-ghost {
+	padding: 9px 20px;
+	background: transparent;
+	color: var(--text-soft);
+	border: 1px solid var(--border-2);
+	border-radius: var(--radius-sm) !important;
+	font-family: inherit;
+	font-size: 13px;
+	font-weight: 500;
+	cursor: pointer;
+	transition: background 0.15s, color 0.15s;
+}
+
+.btn-modal-ghost:hover {
+	background: var(--surface-2);
+	color: var(--text);
+}
+
+.btn-modal-link {
+	padding: 9px 20px;
+	background: transparent;
+	color: var(--accent);
+	border: none;
+	border-radius: var(--radius-sm) !important;
+	font-family: inherit;
+	font-size: 13px;
+	font-weight: 500;
+	cursor: pointer;
+	text-decoration: none;
+	display: inline-flex;
+	align-items: center;
+}
+
+/* ── Alert ───────────────────────────────────────────────────────────── */
+.alert-danger {
+	background: var(--danger-dim) !important;
+	border: 1px solid rgba(239, 68, 68, 0.25) !important;
+	border-radius: var(--radius) !important;
+	color: #fca5a5 !important;
+	padding: 12px 16px;
+	margin-bottom: 16px;
+	font-size: 13px;
 }
 
+.text-danger { color: var(--danger) !important; }
+
+/* ── Selects ─────────────────────────────────────────────────────────── */
 select {
-	-webkit-appearance: none;
-	-moz-appearance: none;
 	appearance: none;
-	background: url(../images/down-arrow.png) no-repeat #24ab48;
-	background-color: #000;
-	background-position: 95%;
-	border: 1px solid #24ab48;
-	border-radius: 0;
-	color: white;
+	-webkit-appearance: none;
+	background-color: var(--surface-2);
+	background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath fill='none' stroke='%235e5e78' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round' d='M1 1l4 4 4-4'/%3E%3C/svg%3E");
+	background-repeat: no-repeat;
+	background-position: right 12px center;
+	border: 1px solid var(--border-2);
+	border-radius: var(--radius);
+	color: var(--text);
 	cursor: pointer;
-	font-size: 16px;
-	overflow: hidden;
-	padding: 0.5rem;
+	font-family: inherit;
+	font-size: 13px;
+	padding: 10px 36px 10px 12px;
 	width: 100%;
+	transition: border-color 0.15s;
 }
 
-select::-ms-expand {
-	display: none;
+select:focus {
+	outline: none;
+	border-color: var(--accent);
+	box-shadow: 0 0 0 3px var(--accent-dim);
 }
 
+select option { background: var(--surface); }
+
+/* ── Table ───────────────────────────────────────────────────────────── */
 .table {
-	color: #ddd;
+	color: var(--text);
+	border-collapse: collapse;
+	width: 100%;
+	font-size: 13px;
 }
 
-th {
-	color: #fff;
-	font-size: 16px;
+.table th {
+	color: var(--text-muted);
+	font-size: 11px;
+	font-weight: 600;
+	text-transform: uppercase;
+	letter-spacing: 0.07em;
+	padding: 0 12px 10px;
+	border-bottom: 1px solid var(--border-2);
 }
 
-#map-container {
-	height: calc(100vh - 56px);
-	width: 100%;
-	background: #161616;
+.table td {
+	padding: 12px;
+	border-bottom: 1px solid rgba(255, 255, 255, 0.04);
+	vertical-align: top;
+	line-height: 1.5;
 }
 
-.map-tooltip {
-	position: absolute;
-	background: #1a1a1a;
-	color: #fff;
-	padding: 8px 12px;
-	border: 1px solid #24ab48;
-	border-radius: 0;
-	pointer-events: none;
-	font-size: 13px;
-	opacity: 0;
-	transition: opacity 0.1s;
-	z-index: 9999;
+.table td:first-child {
+	color: var(--text-soft);
+	font-size: 12px;
+	font-weight: 500;
+	white-space: nowrap;
+	padding-right: 20px;
 }
 
-/* chart containers inside graph modal */
+.table tbody tr:last-child td { border-bottom: none; }
+
+/* ── Chart containers ────────────────────────────────────────────────── */
 #myChart2,
 #myNextChart {
-	min-height: 300px;
-	background: #000;
-}
-
-/* active metric button highlight */
-.active-metric {
-	outline: 2px solid #fff;
+	min-height: 340px;
+	background: transparent;
 }
 
-/* D3 axis lines */
+/* D3 chart axis styling */
 #myChart2 .domain,
 #myNextChart .domain,
 #myChart2 .tick line,
 #myNextChart .tick line {
-	stroke: #555;
+	stroke: var(--border-2);
+}
+
+/* ── Info modal reference links ──────────────────────────────────────── */
+.modal-body .ref-btn {
+	display: block;
+	padding: 10px 16px;
+	background: var(--surface-2);
+	border: 1px solid var(--border);
+	border-radius: var(--radius);
+	color: var(--text-soft);
+	font-size: 13px;
+	font-weight: 500;
+	text-align: center;
+	transition: background 0.15s, color 0.15s, border-color 0.15s;
+}
+
+.modal-body .ref-btn:hover {
+	background: var(--surface-3);
+	border-color: var(--border-2);
+	color: var(--text);
 }