:root {
  --bg-1: linear-gradient(135deg, #0f172a 0%, #071034 60%, #0a1225 100%);
  --glass: rgba(255, 255, 255, 0.06);
  --glass-2: rgba(255, 255, 255, 0.04);
  --accent: linear-gradient(90deg, #c33aed, #1b8092);
  --muted: #9aa4b2;
  --card-radius: 14px;
  --glass-border: rgba(255, 255, 255, 0.06);
  --glass-glow: rgba(237, 58, 237, 0.12);
  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    "Helvetica Neue",
    Arial;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--bg-1);
  color: #e6eef8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size: 15px;
  line-height: 1.35;
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 28px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent);
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(6px);
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
}

.brand h1 {
  margin: 0;
  font-size: 18px;
  letter-spacing: 0.3px;
}

.brand .muted {
  margin: 0;
  font-size: 12px;
  color: var(--muted);
}

.logo {
  width: 44px;
  height: 44px;
  color: white;
  opacity: 0.95;
}

.container {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 22px;
  padding: 28px;
  align-items: start;
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  flex: 1;
}

.left-pane,
.right-pane {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

/* card */
.card {
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.02),
    rgba(255, 255, 255, 0.01)
  );
  border-radius: var(--card-radius);
  padding: 18px;
  border: 1px solid var(--glass-border);
  box-shadow: 0 6px 30px rgba(2, 6, 23, 0.5);
  backdrop-filter: blur(8px);
}

/* form */
.form-card h2 {
  margin: 0 0 10px 0;
}

.field {
  display: flex;
  flex-direction: column;
  margin-bottom: 12px;
}

.field.small {
  flex: 1;
  margin-right: 8px;
}

.row {
  display: flex;
  gap: 8px;
}

.label-text {
  font-weight: 600;
  font-size: 13px;
  margin-bottom: 6px;
}

textarea,
input {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 10px;
  border-radius: 8px;
  color: inherit;
  outline: none;
}

textarea::placeholder,
input::placeholder {
  color: rgba(230, 238, 248, 0.45);
}

.hint {
  font-size: 12px;
  color: var(--muted);
  margin-top: 6px;
}

.actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
}

.btn {
  padding: 8px 12px;
  border-radius: 10px;
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font-weight: 600;
}

.btn.primary {
  background: linear-gradient(90deg, #7c3aed, #06b6d4);
  color: white;
  box-shadow: 0 6px 18px rgba(7, 18, 70, 0.45);
}

.btn.ghost {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.btn.tiny {
  padding: 6px 8px;
  border-radius: 8px;
  font-size: 13px;
}

.spacer {
  flex: 1;
}

/* samples */
.samples {
  margin-top: 12px;
  border-top: 1px dashed rgba(21, 192, 44, 0.03);
  padding-top: 10px;
}

.sample-list {
  display: flex;
  gap: 8px;
  margin-top: 8px;
  flex-wrap: wrap;
}

.sample-item {
  background: rgba(42, 207, 158, 0.459);
  padding: 8px 10px;
  border-radius: 10px;
  font-size: 13px;
  cursor: pointer;
  border: 1px solid rgb(255, 255, 255);
}

/* result */
.result-card {
  min-height: 300px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.main-result {
  padding: 8px 2px;
}

.placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 36px 10px;
  color: var(--muted);
}

.placeholder-gear {
  width: 56px;
  height: 56px;
  opacity: 0.2;
}

/* prediction row */
.prediction {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px;
  border-radius: 12px;
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.02),
    rgba(255, 255, 255, 0.01)
  );
  border: 1px solid rgba(255, 255, 255, 0.03);
}

.pred-left {
  flex: 1;
}

.pred-right {
  text-align: right;
}

.pred-agent {
  font-size: 20px;
  font-weight: 700;
}

.pred-solvent {
  font-weight: 700;
  color: #c7f9cc;
}

.pred-confidence {
  font-size: 13px;
  color: var(--muted);
}

/* structure images */
.structure-row {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-top: 10px;
}

.structure-card {
  display: flex;
  gap: 10px;
  align-items: center;
  background: rgba(255, 255, 255, 0.01);
  padding: 8px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.03);
}

.structure-card img {
  width: 160px;
  height: auto;
  display: block;
  border-radius: 8px;
  background: white;
  padding: 6px;
}

/* alternatives */
.alternatives {
  margin-top: 8px;
}

.alt-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px;
  border-radius: 8px;
}

.alt-bar {
  flex: 1;
  height: 10px;
  border-radius: 999px;
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.02),
    rgba(255, 255, 255, 0.01)
  );
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.03);
}

.alt-bar-fill {
  height: 100%;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 4px 14px var(--glass-glow);
}

/* similar list */
.similar-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 8px;
}

.similar-item {
  padding: 8px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.015);
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

/* small helpers */
.muted {
  color: var(--muted);
}

.small {
  font-size: 12px;
}

/* responsive */
@media (max-width: 980px) {
  .container {
    grid-template-columns: 1fr;
    padding: 18px;
  }

  .right-pane {
    order: 2;
  }

  .left-pane {
    order: 1;
  }
}