:root {
  --bg: #0b1020;
  --bg-soft: #121933;
  --card: rgba(255, 255, 255, 0.08);
  --card-border: rgba(255, 255, 255, 0.12);
  --text: #eef2ff;
  --muted: #b6c0e0;
  --primary: #6d8cff;
  --primary-hover: #5a78ee;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --neutral: #94a3b8;
  --shadow: 0 20px 40px rgba(0, 0, 0, 0.28);
  --radius: 20px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(109, 140, 255, 0.22), transparent 30%),
    radial-gradient(circle at top right, rgba(34, 197, 94, 0.14), transparent 22%),
    linear-gradient(180deg, #0a1022 0%, #0b1020 100%);
  min-height: 100vh;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

header {
  padding: 42px 0 18px;
}

.hero {
  display: grid;
  gap: 18px;
  padding: 28px;
  border: 1px solid var(--card-border);
  border-radius: 28px;
  background: linear-gradient(135deg, rgba(109, 140, 255, 0.18), rgba(255,255,255,0.06));
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.hero p {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 760px;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

nav a {
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  background: rgba(255,255,255,0.08);
  border: 1px solid var(--card-border);
  border-radius: 999px;
  padding: 10px 16px;
  transition: 0.2s ease;
}

nav a:hover {
  background: rgba(255,255,255,0.14);
  transform: translateY(-1px);
}

main {
  padding: 10px 0 48px;
}

.grid {
  display: grid;
  gap: 20px;
}

.grid-2 {
  grid-template-columns: 1.2fr 0.8fr;
}

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.card h2 {
  margin: 0 0 14px;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

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

label {
  display: block;
  font-weight: 700;
  margin-bottom: 8px;
}

textarea,
select,
input,
button {
  width: 100%;
  font-size: 16px;
  font-family: inherit;
}

textarea,
select,
input {
  color: var(--text);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 14px;
  padding: 14px 16px;
  margin-bottom: 16px;
  outline: none;
  transition: 0.2s ease;
}

textarea::placeholder,
input::placeholder {
  color: #aab4d6;
}

textarea:focus,
select:focus,
input:focus {
  border-color: rgba(109, 140, 255, 0.8);
  box-shadow: 0 0 0 4px rgba(109, 140, 255, 0.16);
}

button {
  border: none;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), #8a63ff);
  color: white;
  cursor: pointer;
  font-weight: 800;
  padding: 14px 18px;
  transition: 0.2s ease;
  box-shadow: 0 12px 26px rgba(109, 140, 255, 0.28);
}

button:hover {
  transform: translateY(-1px);
  background: linear-gradient(135deg, var(--primary-hover), #7c56ee);
}

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

pre {
  background: rgba(0,0,0,0.22);
  border: 1px solid rgba(255,255,255,0.08);
  padding: 14px;
  border-radius: 14px;
  overflow-x: auto;
  color: #dbe7ff;
}

ul {
  padding-left: 20px;
}

li {
  margin-bottom: 8px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-top: 16px;
}

.stat-box {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 18px;
  text-align: center;
}

.stat-box span {
  display: block;
  font-size: 13px;
  margin-bottom: 8px;
  color: var(--muted);
  font-weight: 700;
}

.stat-box strong {
  font-size: 28px;
}

.stat-positive strong { color: var(--success); }
.stat-negative strong { color: var(--danger); }
.stat-neutral strong { color: var(--neutral); }
.stat-mixed strong { color: var(--warning); }

.filter-row {
  display: grid;
  grid-template-columns: 1fr 220px 140px;
  gap: 12px;
  align-items: end;
}

.feedback-list {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.feedback-item {
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 18px;
  background: rgba(255,255,255,0.05);
}

.feedback-item small {
  display: block;
  color: var(--muted);
  margin-bottom: 10px;
}

.feedback-item-text {
  line-height: 1.6;
}

.sentiment-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
  margin-bottom: 10px;
  letter-spacing: 0.02em;
}

.sentiment-positive {
  background: rgba(34, 197, 94, 0.14);
  color: #86efac;
  border: 1px solid rgba(34, 197, 94, 0.28);
}

.sentiment-negative {
  background: rgba(239, 68, 68, 0.14);
  color: #fca5a5;
  border: 1px solid rgba(239, 68, 68, 0.28);
}

.sentiment-neutral {
  background: rgba(148, 163, 184, 0.14);
  color: #cbd5e1;
  border: 1px solid rgba(148, 163, 184, 0.28);
}

.sentiment-mixed {
  background: rgba(245, 158, 11, 0.14);
  color: #fcd34d;
  border: 1px solid rgba(245, 158, 11, 0.28);
}

.helper-list {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.helper-list li {
  margin-bottom: 10px;
}

footer {
  color: var(--muted);
  text-align: center;
  padding: 8px 0 40px;
  font-size: 14px;
}

@media (max-width: 900px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 560px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .card,
  .hero {
    padding: 18px;
  }
}