/* =======================
   Root & Reset
======================= */
:root {
  --bg-main: #020617;
  --bg-card: rgba(15, 23, 42, 0.75);
  --accent: #38bdf8;
  --accent-soft: #2563eb;
  --text-main: #e5e7eb;
  --text-muted: #94a3b8;
  --border-soft: rgba(148, 163, 184, 0.15);
  --glow: 0 0 40px rgba(56, 189, 248, 0.15);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  height: 100vh;
  background: radial-gradient(circle at top, #020617, #000);
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
  color: var(--text-main);
  display: flex;
  justify-content: center;
  align-items: center;
}

/* =======================
   App Container
======================= */
.app {
  width: 460px;
  max-width: 95%;
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border-radius: 16px;
  padding: 28px;
  border: 1px solid var(--border-soft);
  box-shadow: var(--glow);
  animation: fadeIn 0.6s ease;
}

/* =======================
   Headings
======================= */
h1 {
  text-align: center;
  font-size: 1.9rem;
  margin-bottom: 20px;
  color: #e2e8f0;
  letter-spacing: 0.5px;
}

h2 {
  margin: 0;
  font-size: 1.6rem;
  color: var(--accent);
}

h3 {
  margin: 18px 0 8px;
  font-size: 1rem;
  font-weight: 600;
  color: #7dd3fc;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* =======================
   Search Input
======================= */
input {
  width: 100%;
  padding: 14px 16px;
  font-size: 1rem;
  border-radius: 10px;
  background: #020617;
  color: var(--text-main);
  border: 1px solid var(--border-soft);
  outline: none;
  transition: 0.25s;
}

input::placeholder {
  color: var(--text-muted);
}

input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

/* =======================
   Button
======================= */
button {
  width: 100%;
  margin-top: 12px;
  padding: 14px;
  border-radius: 10px;
  border: none;
  font-size: 1rem;
  font-weight: 600;
  color: #020617;
  background: linear-gradient(135deg, var(--accent), var(--accent-soft));
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 25px rgba(56, 189, 248, 0.35);
}

button:active {
  transform: scale(0.98);
}

/* =======================
   Result Area
======================= */
.result {
  margin-top: 24px;
  animation: slideUp 0.4s ease;
}

.result em {
  color: var(--text-muted);
  font-style: normal;
}

/* =======================
   Sections
======================= */
.section {
  padding-top: 10px;
  border-top: 1px solid var(--border-soft);
}

/* =======================
   Lists
======================= */
ul {
  padding-left: 18px;
  margin: 8px 0;
}

li {
  line-height: 1.5;
  margin-bottom: 6px;
  color: #cbd5f5;
}

li small {
  display: block;
  color: var(--text-muted);
  margin-top: 2px;
}

/* =======================
   Chips (Synonyms / Antonyms)
======================= */
.list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.list span {
  padding: 6px 10px;
  background: linear-gradient(
    135deg,
    rgba(56, 189, 248, 0.15),
    rgba(37, 99, 235, 0.15)
  );
  border: 1px solid var(--border-soft);
  border-radius: 999px;
  font-size: 0.85rem;
  color: #e0f2fe;
  transition: 0.2s;
}

.list span:hover {
  background: rgba(56, 189, 248, 0.25);
  transform: translateY(-1px);
}

/* =======================
   Empty / Error State
======================= */
.result p {
  text-align: center;
  color: #f87171;
  font-weight: 500;
}

/* =======================
   Animations
======================= */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: scale(0.96);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* =======================
   Responsive
======================= */
@media (max-width: 480px) {
  .app {
    padding: 20px;
  }

  h1 {
    font-size: 1.6rem;
  }
}