:root {
  --bg: #000814;
  --bg-soft: #0a1221;
  --panel: #101a2b;
  --panel-2: #0a1220;
  --text: #fff9d8;
  --muted: #c9d4ac;
  --neon: #ffd300;
  --neon-2: #9ea513;
  --sky: #58b3d4;
  --teal: #46beb7;
  --warning: #ffbf3c;
  --danger: #ff6b5f;
  --ok: #80ffd4;
  --border: rgba(255, 211, 0, 0.34);
  --shadow: 0 16px 45px rgba(0, 0, 0, 0.45);
  --radius: 16px;
  --radius-sm: 12px;
  --trans: 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  min-height: 100%;
}

body {
  font-family: "Space Grotesk", "Segoe UI", system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(
      1200px 700px at 78% -20%,
      rgba(255, 211, 0, 0.26),
      transparent 65%
    ),
    radial-gradient(
      900px 500px at -10% -10%,
      rgba(70, 190, 183, 0.16),
      transparent 60%
    ),
    linear-gradient(170deg, #000814 0%, #081224 52%, #00070f 100%);
  line-height: 1.45;
  padding: 20px;
  overflow-x: hidden;
}

h1,
h2 {
  font-family:
    "Orbitron",
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    sans-serif;
}

.app {
  max-width: 1160px;
  margin: 0 auto;
  display: grid;
  gap: 18px;
}

.card {
  background: linear-gradient(
    180deg,
    rgba(16, 26, 43, 0.93),
    rgba(10, 18, 32, 0.96)
  );
  border: 1px solid transparent;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(4px);
}

.hero {
  padding: 24px;
  position: relative;
  overflow: hidden;
  animation: fadeSlide 450ms ease-out;
}

.hero-mark {
  position: absolute;
  right: -10px;
  top: -24px;
  width: clamp(120px, 18vw, 210px);
  opacity: 0.12;
  filter: drop-shadow(0 0 22px rgba(255, 211, 0, 0.35)) saturate(1.08);
  pointer-events: none;
  user-select: none;
  transform: rotate(-8deg);
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto -90px -80px auto;
  width: 240px;
  height: 240px;
  background: radial-gradient(circle, rgba(255, 211, 0, 0.38), transparent 65%);
  pointer-events: none;
}

.title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

h1 {
  font-size: clamp(1.6rem, 2.5vw, 2.2rem);
  letter-spacing: 0.02em;
  font-weight: 700;
}

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

.brand-icon-wrap {
  width: 50px;
  height: 50px;
  border-radius: 12px;
  padding: 6px;
  display: inline-grid;
  place-items: center;
  border: 1px solid rgba(255, 211, 0, 0.52);
  background: linear-gradient(
    165deg,
    rgba(255, 211, 0, 0.17),
    rgba(3, 10, 20, 0.35)
  );
  box-shadow:
    0 0 0 1px rgba(255, 211, 0, 0.12) inset,
    0 6px 18px rgba(255, 211, 0, 0.18);
}

.brand-icon {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 8px;
}

.accent {
  color: var(--neon);
  text-shadow: 0 0 24px rgba(255, 211, 0, 0.65);
}

.subtitle {
  margin-top: 8px;
  color: var(--muted);
  max-width: 850px;
  font-size: 0.98rem;
  position: relative;
  z-index: 1;
}

.lang-toggle {
  display: inline-flex;
  border-radius: 999px;
  background: rgba(8, 16, 31, 0.8);
  border: 1px solid var(--border);
  overflow: hidden;
}

.lang-btn {
  border: none;
  background: transparent;
  color: var(--muted);
  padding: 10px 14px;
  cursor: pointer;
  font-weight: 600;
  transition: all var(--trans);
}

.lang-btn.active {
  color: #221500;
  background: linear-gradient(135deg, var(--neon), #ffea69);
  text-shadow: none;
  box-shadow: 0 0 18px rgba(255, 211, 0, 0.45) inset;
}

.controls {
  padding: 20px;
  display: grid;
  gap: 14px;
  animation: fadeSlide 520ms ease-out;
}

.input-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
}

.seed-wrap {
  display: grid;
  gap: 8px;
}

label {
  font-size: 0.88rem;
  color: var(--muted);
  font-weight: 600;
  letter-spacing: 0.02em;
}

input[type="text"] {
  width: 100%;
  background: rgba(3, 10, 20, 0.78);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 14px;
  color: var(--text);
  font-size: 1rem;
  outline: none;
  transition:
    border-color var(--trans),
    box-shadow var(--trans),
    transform var(--trans);
}

input[type="text"]:focus {
  border-color: rgba(255, 211, 0, 0.9);
  box-shadow:
    0 0 0 3px rgba(255, 211, 0, 0.26),
    0 0 20px rgba(255, 211, 0, 0.22);
  transform: translateY(-1px);
}

.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

button {
  border: 1px solid transparent;
  border-radius: 12px;
  padding: 11px 14px;
  color: #1f1300;
  background: linear-gradient(135deg, #ffe251, var(--neon));
  font-weight: 700;
  letter-spacing: 0.015em;
  cursor: pointer;
  transition:
    transform var(--trans),
    box-shadow var(--trans),
    opacity var(--trans),
    border-color var(--trans);
  box-shadow: 0 10px 24px rgba(255, 211, 0, 0.44);
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 30px rgba(255, 211, 0, 0.52);
}

button:active {
  transform: translateY(0);
}

button.secondary {
  background: rgba(4, 10, 20, 0.72);
  color: var(--text);
  border-color: var(--border);
  box-shadow: none;
}

button.secondary:hover {
  border-color: rgba(255, 211, 0, 0.72);
  box-shadow: 0 0 0 3px rgba(255, 211, 0, 0.2);
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.meta-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.meta-box {
  background: rgba(4, 10, 20, 0.5);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 11px 12px;
  min-height: 74px;
  display: grid;
  align-content: center;
  gap: 4px;
}

.meta-k {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.meta-v {
  font-size: 1.03rem;
  font-weight: 700;
}

.difficulty-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 700;
}

.dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  box-shadow: 0 0 12px currentColor;
}

.dot.low {
  color: var(--ok);
  background: var(--ok);
}
.dot.medium {
  color: var(--warning);
  background: var(--warning);
}
.dot.high {
  color: var(--danger);
  background: var(--danger);
}

.results {
  padding: 18px;
  display: grid;
  gap: 10px;
  animation: fadeSlide 620ms ease-out;
}

.empty {
  border: 1px dashed var(--border);
  border-radius: 14px;
  padding: 28px;
  color: var(--muted);
  text-align: center;
  background: rgba(4, 10, 20, 0.4);
}

details.cluster {
  border: 1px solid var(--border);

  margin-bottom: 1rem;

  border-radius: 12px;
  overflow: hidden;
  background: rgba(4, 10, 20, 0.38);
  transform-origin: top center;
  animation: popIn 260ms ease-out;
}

summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 13px 14px;
  background: rgba(8, 15, 29, 0.68);
  border-bottom: 1px solid transparent;
  transition:
    background var(--trans),
    border-color var(--trans);
}

summary::-webkit-details-marker {
  display: none;
}

details[open] summary {
  border-color: var(--border);
  background: rgba(12, 20, 36, 0.86);
}

.cluster-title {
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.chev {
  display: inline-block;
  transition: transform var(--trans);
  color: var(--neon);
  font-weight: 900;
  width: 12px;
}

details[open] .chev {
  transform: rotate(90deg);
}

.cluster-meta {
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 600;
}

.keywords {
  padding: 12px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 10px;
}

.keyword-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  background: rgba(3, 10, 19, 0.6);
  display: grid;
  gap: 8px;
  transition:
    transform var(--trans),
    border-color var(--trans),
    box-shadow var(--trans);
}

.keyword-card:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 211, 0, 0.75);
  box-shadow: 0 8px 20px rgba(255, 211, 0, 0.14);
}

.kw {
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--text);
  word-break: break-word;
}

.badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.badge {
  font-size: 0.74rem;
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.intent-info {
  color: var(--sky);
  border-color: rgba(88, 179, 212, 0.5);
  background: rgba(88, 179, 212, 0.14);
}
.intent-commercial {
  color: #ffd300;
  border-color: rgba(255, 211, 0, 0.55);
  background: rgba(255, 211, 0, 0.16);
}
.intent-transactional {
  color: var(--teal);
  border-color: rgba(70, 190, 183, 0.52);
  background: rgba(70, 190, 183, 0.14);
}

.footer-note {
  color: var(--muted);
  font-size: 0.78rem;
  text-align: right;
  padding-right: 2px;
}

.toast {
  position: fixed;
  bottom: 18px;
  right: 18px;
  background: rgba(9, 16, 29, 0.95);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 0.86rem;
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition:
    opacity var(--trans),
    transform var(--trans);
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

@keyframes fadeSlide {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes popIn {
  from {
    opacity: 0;
    transform: scale(0.985);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@media (max-width: 920px) {
  .input-row {
    grid-template-columns: 1fr;
  }

  .meta-row {
    grid-template-columns: 1fr;
  }

  .actions {
    width: 100%;
  }

  .actions button {
    flex: 1;
  }
}

@media (max-width: 520px) {
  body {
    padding: 14px;
  }
  .hero,
  .controls,
  .results {
    padding: 14px;
  }
  .keywords {
    grid-template-columns: 1fr;
  }
  button {
    width: 100%;
  }
  .actions {
    display: grid;
  }
  .brand-icon-wrap {
    width: 42px;
    height: 42px;
    border-radius: 10px;
  }
  .hero-mark {
    width: 120px;
    right: -22px;
    top: -10px;
    opacity: 0.1;
  }
}