:root {

  --bg: #050816;

  --bg-elevated: #0b1020;

  --accent: #4f46e5;

  --accent-soft: rgba(79, 70, 229, 0.1);

  --accent-strong: rgba(79, 70, 229, 0.4);

  --border: rgba(255, 255, 255, 0.06);

  --text-main: #f9fafb;

  --text-muted: #9ca3af;

  --radius-lg: 20px;

  --radius-xl: 28px;

  --shadow-soft: 0 18px 40px rgba(15, 23, 42, 0.6);

  --shadow-soft-strong: 0 20px 60px rgba(15, 23, 42, 0.9);

  --transition-fast: 150ms ease-out;

  --transition-med: 220ms ease-out;

}

*,

*::before,

*::after {

  box-sizing: border-box;

}

body {

  margin: 0;

  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",

    "Segoe UI", sans-serif;

  background: radial-gradient(circle at top left, #1d2338 0, #050816 40%, #020617 100%);

  color: var(--text-main);

  min-height: 100vh;

}

.app {

  max-width: 1100px;

  margin: 0 auto;

  padding: 1.25rem 1.25rem 2.5rem;

}

/* HEADER */

.app-header {

  display: flex;

  justify-content: space-between;

  align-items: center;

  gap: 1.5rem;

  padding: 1.25rem 1.5rem;

  margin-bottom: 1.5rem;

  border-radius: var(--radius-xl);

  background: linear-gradient(135deg, rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.85));

  border: 1px solid rgba(148, 163, 184, 0.2);

  box-shadow: var(--shadow-soft);

  backdrop-filter: blur(18px);

}

#app-title {

  font-size: 1.7rem;

  letter-spacing: 0.04em;

  margin: 0 0 0.3rem;

}

#app-subtitle {

  margin: 0;

  font-size: 0.95rem;

  color: var(--text-muted);

}

.lang-switcher {

  display: flex;

  align-items: center;

  gap: 0.6rem;

}

#language-label {

  font-size: 0.8rem;

  text-transform: uppercase;

  letter-spacing: 0.08em;

  color: var(--text-muted);

}

#language-select {

  padding: 0.4rem 0.8rem;

  border-radius: 999px;

  border: 1px solid rgba(148, 163, 184, 0.35);

  background: radial-gradient(circle, #020617, #020617);

  color: var(--text-main);

  font-size: 0.85rem;

  outline: none;

  cursor: pointer;

}

/* CATEGORY SECTION */

.category-section {

  margin-top: 1.3rem;

  margin-bottom: 1.3rem;

  padding: 1rem 1.2rem;

  border-radius: var(--radius-lg);

  background: linear-gradient(90deg, rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.8));

  border: 1px solid rgba(148, 163, 184, 0.25);

  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.7);

}

.category-tabs {

  display: inline-flex;

  padding: 0.18rem;

  border-radius: 999px;

  background: radial-gradient(circle, rgba(15, 23, 42, 0.95), rgba(15, 23, 42, 0.9));

  border: 1px solid rgba(148, 163, 184, 0.3);

  box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.9);

}

.category-tab {

  border: none;

  background: transparent;

  color: var(--text-muted);

  padding: 0.55rem 1.1rem;

  border-radius: 999px;

  cursor: pointer;

  font-size: 0.8rem;

  font-weight: 500;

  letter-spacing: 0.06em;

  text-transform: uppercase;

  transition: background var(--transition-med), color var(--transition-med),

    transform var(--transition-fast), box-shadow var(--transition-med);

}

.category-tab:hover {

  color: var(--text-main);

  background: rgba(148, 163, 184, 0.08);

}

.category-tab.active {

  color: white;

  background: radial-gradient(circle at 0 0, var(--accent-strong), var(--accent));

  transform: translateY(-1px);

  box-shadow: 0 10px 25px rgba(79, 70, 229, 0.4);

}

.category-description {

  margin-top: 0.9rem;

  margin-bottom: 0;

  font-size: 0.92rem;

  color: var(--text-muted);

}

/* EXAMPLES GRID */

.examples-section {

  margin-top: 1.3rem;

}

.examples-grid {

  display: grid;

  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));

  gap: 1.2rem;

}

.example-card {

  position: relative;

  padding: 1.1rem 1.1rem 1rem;

  border-radius: 18px;

  background: radial-gradient(circle at top left, rgba(15, 23, 42, 0.95), rgba(15, 23, 42, 0.96));

  border: 1px solid var(--border);

  box-shadow: var(--shadow-soft);

  overflow: hidden;

  transition: transform var(--transition-med), box-shadow var(--transition-med),

    border-color var(--transition-med), background 200ms ease-out;

}

.example-card::before {

  content: "";

  position: absolute;

  inset: 0;

  background: radial-gradient(circle at top right, rgba(79, 70, 229, 0.18), transparent 55%);

  opacity: 0;

  transition: opacity var(--transition-med);

  pointer-events: none;

}

.example-card:hover {

  transform: translateY(-4px) translateZ(0);

  box-shadow: var(--shadow-soft-strong);

  border-color: rgba(129, 140, 248, 0.7);

}

.example-card:hover::before {

  opacity: 1;

}

.example-header {

  display: flex;

  justify-content: space-between;

  align-items: flex-start;

  gap: 0.6rem;

  margin-bottom: 0.7rem;

}

.example-title {

  margin: 0;

  font-size: 1rem;

}

.example-category-pill {

  font-size: 0.72rem;

  padding: 0.25rem 0.6rem;

  border-radius: 999px;

  background: var(--accent-soft);

  color: #c7d2fe;

  border: 1px solid rgba(129, 140, 248, 0.6);

  text-transform: uppercase;

  letter-spacing: 0.09em;

  white-space: nowrap;

}

.example-description {

  margin: 0;

  font-size: 0.9rem;

  color: var(--text-muted);

  line-height: 1.5;

}

.example-footer {

  margin-top: 0.75rem;

  display: flex;

  justify-content: space-between;

  align-items: center;

  gap: 0.5rem;

  font-size: 0.78rem;

}

.example-stack {

  display: flex;

  flex-wrap: wrap;

  gap: 0.25rem;

}

.stack-pill {

  padding: 0.18rem 0.5rem;

  border-radius: 999px;

  border: 1px solid rgba(148, 163, 184, 0.4);

  color: rgba(209, 213, 219, 0.85);

}

.example-link {

  text-decoration: none;

  border-radius: 999px;

  padding: 0.3rem 0.7rem;

  font-size: 0.78rem;

  border: 1px solid rgba(148, 163, 184, 0.7);

  color: var(--text-main);

  backdrop-filter: blur(10px);

}

.example-link:hover {

  background: rgba(148, 163, 184, 0.12);

}

/* EMPTY STATE */

.empty-state {

  margin-top: 2rem;

  text-align: center;

}

#empty-state-text {

  color: var(--text-muted);

}

/* FOOTER */

.app-footer {

  margin-top: 2rem;

  text-align: center;

  font-size: 0.8rem;

  color: var(--text-muted);

}

/* RESPONSIVE */

@media (max-width: 720px) {

  .app-header {

    flex-direction: column;

    align-items: flex-start;

  }

  .lang-switcher {

    align-self: stretch;

    justify-content: space-between;

  }

}