:root {
  --bg: #060806;
  --panel: #0b1117;
  --panel-2: #101822;
  --neon: #72d6ff;
  --neon-soft: #3396c7;
  --text: #efffec;
  --muted: #9eb3c4;
  --border: rgba(114, 214, 255, 0.25);
  --danger: #c9f1ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Space Grotesk", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 20% 15%, #112641 0%, #060b14 42%, #02050a 100%);
  position: relative;
}



.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(114, 214, 255, 0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(114, 214, 255, 0.1) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(circle at center, black 25%, transparent 85%);
  pointer-events: none;
}

.hero,
.container,
footer {
  width: min(1100px, calc(100% - 2rem));
  margin-inline: auto;
  position: relative;
  z-index: 1;
}

.hero {
  padding: 3.5rem 0 1.2rem;
}

.eyebrow {
  color: var(--neon);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  margin-bottom: 0.2rem;
}

h1 {
  margin: 0;
  font-size: clamp(2.3rem, 5vw, 4rem);
  line-height: 1;
  text-shadow: 0 0 18px rgba(114, 214, 255, 0.35);
}

.subtitle {
  color: var(--muted);
  max-width: 68ch;
  margin-top: 0.8rem;
}

.container {
  display: grid;
  gap: 1rem;
  padding-bottom: 2rem;
}

.panel {
  background: linear-gradient(155deg, var(--panel-2), var(--panel));
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1rem;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.01), 0 12px 40px rgba(0, 0, 0, 0.4);
}

.uploader h2,
.chart-card h2 {
  margin: 0;
  font-size: 1rem;
}

.hint {
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.92rem;
}

code {
  color: var(--danger);
}

.dropzone {
  border: 1px dashed var(--border);
  margin-top: 1rem;
  border-radius: 14px;
  padding: 1.3rem;
  display: block;
  cursor: pointer;
  transition: border-color 0.25s ease, transform 0.25s ease, background 0.25s ease;
  background: rgba(114, 214, 255, 0.04);
}

.dropzone:hover,
.dropzone.dragover {
  border-color: var(--neon);
  transform: translateY(-1px);
  background: rgba(114, 214, 255, 0.1);
}

.dropzone input {
  display: none;
}

.drop-title {
  display: block;
  font-weight: 700;
}

.drop-sub {
  display: block;
  color: var(--muted);
  margin-top: 0.35rem;
}

button.ghost {
  margin-top: 0.8rem;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.5rem 0.85rem;
  cursor: pointer;
}

button.ghost:hover {
  border-color: var(--neon);
}

.download-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: #fff;
}

.sample-downloads {
  margin-top: 0.8rem;
}

.uploader-actions {
  display: flex;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.google-connect {
  margin-top: 0.8rem;
  padding-top: 0.2rem;
}

.card-actions {
  display: flex;
  gap: 0.45rem;
  margin-top: 0.7rem;
  flex-wrap: wrap;
}

.card-actions .ghost {
  margin-top: 0;
  padding: 0.4rem 0.65rem;
  font-size: 0.82rem;
}

.metrics {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: repeat(3, 1fr);
}

.metric-card p {
  margin: 0;
  color: var(--muted);
}

.metric-card h3 {
  margin: 0.4rem 0 0;
  color: var(--neon);
  font-size: clamp(1.2rem, 2.2vw, 1.8rem);
}

.card-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.7rem;
}

.card-head p {
  color: var(--muted);
  margin: 0;
  font-size: 0.85rem;
}

.heatmap-shell {
  margin-top: 0.8rem;
  border: 1px solid rgba(114, 214, 255, 0.22);
  border-radius: 14px;
  padding: 0.85rem;
  background: linear-gradient(180deg, rgba(5, 10, 18, 0.96), rgba(4, 8, 15, 0.9));
}

.heatmap-axis {
  display: grid;
  grid-template-columns: 58px repeat(24, minmax(18px, 1fr));
  gap: 0.28rem;
  color: #7e8d81;
  font-size: 0.75rem;
}

.heatmap-axis span {
  text-align: center;
}

.heatmap-rows {
  margin-top: 0.28rem;
  display: grid;
  gap: 0.28rem;
}

.heat-row {
  display: grid;
  grid-template-columns: 58px repeat(24, minmax(18px, 1fr));
  gap: 0.28rem;
  align-items: center;
}

.heat-day {
  color: #aeb3b7;
  font-size: 0.86rem;
  letter-spacing: 0.08em;
  font-weight: 700;
}

.heat-cell {
  position: relative;
  height: 44px;
  border-radius: 8px;
  border: 1px solid rgba(132, 143, 153, 0.24);
  background: rgba(8, 12, 18, 0.9);
}

.heat-cell::after {
  content: attr(data-tip);
  position: absolute;
  bottom: 115%;
  left: 50%;
  transform: translateX(-50%) scale(0.92);
  font-size: 0.68rem;
  white-space: nowrap;
  background: #09121d;
  border: 1px solid var(--border);
  padding: 0.2rem 0.35rem;
  border-radius: 5px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.heat-cell:hover::after {
  opacity: 1;
  transform: translateX(-50%) scale(1);
}

.level-1 { background: rgba(9, 30, 56, 0.95); border-color: rgba(114, 214, 255, 0.18); }
.level-2 { background: rgba(13, 52, 86, 0.95); border-color: rgba(114, 214, 255, 0.23); }
.level-3 { background: rgba(18, 78, 120, 0.96); border-color: rgba(114, 214, 255, 0.29); }
.level-4 { background: rgba(30, 100, 145, 0.96); border-color: rgba(114, 214, 255, 0.36); }
.level-5 { background: rgba(38, 124, 170, 0.98); border-color: rgba(114, 214, 255, 0.43); }
.level-6 { background: rgba(52, 152, 198, 0.98); border-color: rgba(114, 214, 255, 0.52); }
.level-7 {
  background: rgba(70, 186, 232, 1);
  border-color: rgba(114, 214, 255, 0.7);
  box-shadow: 0 0 14px rgba(114, 214, 255, 0.24);
}

.heatmap-legend {
  margin-top: 0.9rem;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.45rem;
  color: #8d9490;
  font-size: 0.9rem;
  line-height: 1;
}

.legend-chip {
  width: 19px;
  height: 19px;
  flex: 0 0 19px;
  border-radius: 7px;
  border: 1px solid rgba(132, 143, 153, 0.28);
  background: rgba(8, 12, 18, 0.9);
}

.heatmap-legend span {
  display: inline-flex;
  align-items: center;
}

.heatmap-insight {
  margin-top: 0.95rem;
  border-radius: 12px;
  border: 1px solid rgba(114, 214, 255, 0.28);
  background: linear-gradient(90deg, rgba(8, 26, 46, 0.95), rgba(4, 11, 22, 0.86));
  color: #cfd9d2;
  padding: 0.65rem 0.8rem;
}

.heatmap-insight strong {
  color: var(--neon);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 1rem;
}

.sender-list,
.legend {
  list-style: none;
  margin: 0.8rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
}

.sender-list li,
.legend li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.45rem 0.55rem;
  border: 1px solid rgba(114, 214, 255, 0.16);
  border-radius: 8px;
  background: rgba(114, 214, 255, 0.04);
  font-size: 0.94rem;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 999px;
  margin-right: 0.4rem;
  display: inline-block;
}

#typeChart {
  margin-top: 0.8rem;
  width: min(320px, 100%);
  height: auto;
  display: block;
  margin-inline: auto;
}

footer {
  padding-bottom: 2rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.modal {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: rgba(1, 4, 1, 0.82);
  z-index: 20;
}

.modal.is-open {
  display: flex;
}

.modal-card {
  width: min(720px, 100%);
  background: linear-gradient(155deg, var(--panel-2), var(--panel));
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1rem;
}

.modal-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.8rem;
}

.modal-head h2 {
  margin: 0;
  font-size: 1rem;
}

.modal-close {
  margin-top: 0;
  font-size: 0.82rem;
  padding: 0.35rem 0.6rem;
}

.modal-card ol {
  margin: 0.8rem 0 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

.modal-card li {
  margin-bottom: 0.45rem;
}

@media (max-width: 900px) {
  .metrics {
    grid-template-columns: 1fr;
  }

  .grid-2 {
    grid-template-columns: 1fr;
  }

  .heatmap-shell {
    overflow-x: auto;
  }

  .heatmap-axis,
  .heat-row {
    min-width: 760px;
  }
}