frontend/src/index.css

:root {
  --bg: #0b1220;
  --card: #161f33;
  --card2: #11192b;
  --line: #26314a;
  --txt: #e6edf6;
  --mut: #93a4bd;
  --ok: #16a34a;
  --warn: #d97706;
  --mute: #64748b;
  --blue: #8b5cf6;
  --red: #dc2626;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --gradient-1: #0b1220;
  --gradient-2: #130f26;
  --gradient-3: #0e1b33;
}

body.light {
  --bg: #fdfbf7;
  --card: #ffffff;
  --card2: #f4f2ec;
  --line: #e6e2d8;
  --txt: #2a2520;
  --mut: #7c736a;
  --ok: #15803d;
  --warn: #b45309;
  --mute: #94a3b8;
  --blue: #d96c52;
  --red: #dc2626;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --gradient-1: #fdfbf7;
  --gradient-2: #faeee5;
  --gradient-3: #f5f0e6;

}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, system-ui, sans-serif;
  background: linear-gradient(-45deg, var(--gradient-1), var(--gradient-2), var(--gradient-3), var(--gradient-1));
  background-size: 400% 400%;
  animation: gradientBG 15s ease infinite;
  color: var(--txt);
  line-height: 1.5;
  transition: background 0.3s, color 0.3s;
}

@keyframes gradientBG {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}a { color: inherit; text-decoration: none; }

header { padding: 16px 24px; background: var(--card); border-bottom: 1px solid var(--line); }
header h1 { margin: 0; font-size: 18px; }
header p { margin: 6px 0 0; color: var(--mut); font-size: 13px; max-width: 820px; }

nav { display: flex; gap: 4px; padding: 0 16px; background: var(--card); border-bottom: 1px solid var(--line); }
nav a {
  color: var(--mut); border-bottom: 2px solid transparent;
  padding: 12px 16px; cursor: pointer; font-size: 14px;
}
nav a.active { color: var(--txt); border-bottom-color: var(--blue); }

main { padding: 24px; max-width: 1080px; margin: 0 auto; min-height: calc(100vh - 200px); }

/* footer */
footer {
  text-align: center;
  padding: 32px 24px;
  color: var(--mute);
  font-size: 14px;
  border-top: 1px solid var(--line);
  margin-top: 40px;
}

.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px; margin-bottom: 16px; box-shadow: var(--shadow); transition: background-color 0.2s, border-color 0.2s; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.spread { justify-content: space-between; }
.muted { color: var(--mut); font-size: 13px; }
.dim { color: var(--mut); }
h3.sec { margin: 0 0 6px; font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--mut); }

input, select {
  background: var(--bg); color: var(--txt); border: 1px solid var(--line);
  border-radius: 8px; padding: 9px; font-size: 14px;
}
button.go { background: var(--blue); color: #fff; border: 0; border-radius: 8px; padding: 9px 16px; cursor: pointer; font-weight: 600; }
button.go:disabled { opacity: .5; cursor: default; }
button.go.approve { background: var(--ok); }
button.go.reject { background: var(--red); }
button.ghost { background: transparent; color: var(--mut); border: 1px solid var(--line); border-radius: 8px; padding: 8px 12px; cursor: pointer; }

/* custom upload button */
.custom-upload {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--card2);
  color: var(--txt);
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
}
.custom-upload:hover {
  background: rgba(37, 99, 235, 0.1);
  border-color: var(--blue);
  color: var(--blue);
}
.custom-upload input[type="file"] {
  display: none;
}

/* icon button for theme */
button.icon-btn {
  background: transparent;
  color: var(--mut);
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s, color 0.2s;
}
button.icon-btn:hover {
  background: var(--card2);
  color: var(--txt);
}

img.annot { width: 100%; border-radius: 10px; border: 1px solid var(--line); margin-top: 12px; }

.banner { padding: 10px 14px; border-radius: 8px; font-size: 14px; margin-bottom: 12px; line-height: 1.6; border-left: 4px solid transparent; }
.banner.info { background: rgba(37, 99, 235, 0.1); color: var(--blue); border-left-color: var(--blue); }
.banner.warnb { background: rgba(217, 119, 6, 0.1); color: var(--warn); border-left-color: var(--warn); }
.banner.good { background: rgba(22, 163, 74, 0.1); color: var(--ok); border-left-color: var(--ok); }

/* feature grid for empty state */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
  margin-top: 32px;
  margin-bottom: 32px;
}
.feature-card {
  background: var(--card2);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  transition: transform 0.2s, box-shadow 0.2s;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: var(--blue);
}

/* badges */
.badge { padding: 4px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; white-space: nowrap; }
.badge.ok { background: rgba(22, 163, 74, .18); color: #5ee08b; }
.badge.warn { background: rgba(217, 119, 6, .18); color: #ffc560; }
.badge.mute { background: rgba(100, 116, 139, .2); color: #aab6c8; }
.badge.tier { background: rgba(37, 99, 235, .18); color: #9ec1ff; cursor: help; }

/* violation card */
.vcard {
  display: grid; grid-template-columns: 44px 1fr auto; gap: 14px; align-items: center;
  padding: 14px; border: 1px solid var(--line); border-radius: 10px; margin-bottom: 10px;
  background: var(--card2); cursor: pointer; transition: border-color .15s;
}
.vcard:hover { border-color: var(--blue); }
.vicon { font-size: 26px; text-align: center; }
.vtitle { font-weight: 600; font-size: 15px; }
.vsub { color: var(--mut); font-size: 13px; margin-top: 3px; }
.right { text-align: right; }

.plate {
  font-family: ui-monospace, Consolas, monospace; background: var(--card2); border: 1px solid var(--line);
  padding: 2px 8px; border-radius: 6px; letter-spacing: 1px;
}

/* score bars */
.bar { height: 7px; background: #23304a; border-radius: 99px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--blue); }
.bar.thin { max-width: 240px; margin-top: 8px; }
.sbrow { display: grid; grid-template-columns: 88px 1fr 46px; gap: 10px; align-items: center; margin: 6px 0; font-size: 13px; }
.sbrow .lbl { color: var(--mut); }
.sbrow .val { text-align: right; font-variant-numeric: tabular-nums; }
.sbrow.fused .lbl, .sbrow.fused .val { color: var(--txt); font-weight: 700; }
.sbrow.off .lbl, .sbrow.off .val { color: var(--mute); font-style: italic; }

/* KPIs + charts */
.kpis { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.kpi .n { font-size: 26px; font-weight: 700; }
.kpi .l { color: var(--mut); font-size: 13px; }
.charts { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 9px 8px; border-bottom: 1px solid var(--line); }
tbody tr { cursor: pointer; }
tbody tr:hover { background: var(--card2); }

.legend { font-size: 13px; color: var(--mut); line-height: 1.8; }

/* modal */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0, 0, 0, 0.5); backdrop-filter: blur(4px); display: flex;
  align-items: flex-start; justify-content: center; padding: 32px 16px; z-index: 50; overflow-y: auto;
}
.modal {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  width: 100%; max-width: 720px; padding: 0; box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}
.modal-head { display: flex; align-items: center; gap: 12px; padding: 18px 20px; border-bottom: 1px solid var(--line); }
.modal-head .x { margin-left: auto; cursor: pointer; color: var(--mut); font-size: 22px; line-height: 1; background: none; border: 0; }
.modal-body { padding: 20px; }
.block { margin-bottom: 18px; }

/* e-challan */
.challan {
  border: 1px dashed var(--line); border-radius: 10px; padding: 16px; background: var(--card2);
}
.challan .hd { font-size: 12px; letter-spacing: .12em; color: #ffc560; text-transform: uppercase; margin-bottom: 10px; }
.challan .grid { display: grid; grid-template-columns: 120px 1fr; gap: 6px 12px; font-size: 14px; }
.challan .grid .k { color: var(--mut); }
.challan .grid .v { color: var(--txt); }
.hash { font-family: ui-monospace, Consolas, monospace; font-size: 12px; word-break: break-all; }

/* audit timeline */
.audit { list-style: none; padding: 0; margin: 0; }
.audit li { padding: 8px 0 8px 16px; border-left: 2px solid var(--line); margin-left: 4px; font-size: 13px; }
.audit li b { color: var(--txt); }

.spinner {
  width: 16px; height: 16px; border: 2px solid var(--line); border-top-color: var(--blue);
  border-radius: 50%; display: inline-block; animation: spin .8s linear infinite; vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

@media (max-width: 720px) {
  .kpis { grid-template-columns: repeat(2, 1fr); }
  .charts { grid-template-columns: 1fr; }
  .vcard { grid-template-columns: 36px 1fr; }
  .vcard .right { grid-column: 2; text-align: left; }
}