:root {
  color-scheme: dark;
  --bg: #030712;
  --panel: rgba(18, 22, 37, 0.72);
  --panel-border: rgba(112, 129, 255, 0.18);
  --text: #f4f7ff;
  --muted: #aab1d9;
  --accent: #7c5cff;
  --accent-strong: #ffb347;
  --danger: #ff5f6d;
  --boost: 1;
  font-size: clamp(15px, 1.9vw, 16px);
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: radial-gradient(circle at top, rgba(52, 74, 255, 0.2), transparent 55%),
    radial-gradient(circle at 20% 80%, rgba(255, 95, 109, 0.22), transparent 60%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.app-shell {
  max-width: 1080px;
  margin: 0 auto;
  padding: clamp(1.5rem, 4vw, 3rem) clamp(1.25rem, 4vw, 4rem) 4rem;
  display: flex;
  flex-direction: column;
  gap: clamp(2rem, 4vw, 3.5rem);
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  padding: 1.25rem 1.5rem;
  background: linear-gradient(135deg, rgba(18, 22, 37, 0.75), rgba(22, 18, 37, 0.4));
  border: 1px solid var(--panel-border);
  border-radius: 20px;
  backdrop-filter: blur(18px);
  box-shadow: 0 18px 35px rgba(0, 0, 0, 0.32);
}

.branding {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo-glow {
  width: clamp(48px, 8vw, 62px);
  height: clamp(48px, 8vw, 62px);
  background: radial-gradient(circle, #ffd56f 0%, #ff5f6d 40%, transparent 65%);
  border-radius: 18px;
  position: relative;
  box-shadow: 0 0 45px rgba(255, 160, 64, 0.5), inset 0 0 28px rgba(255, 240, 180, 0.3);
}

.branding h1 {
  margin: 0;
  font-size: clamp(1.4rem, 5vw, 1.85rem);
  font-weight: 700;
}

.branding p {
  margin: 0.2rem 0 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.cta {
  background: linear-gradient(120deg, var(--accent), #6be1ff);
  color: #05070f;
  border: none;
  border-radius: 999px;
  padding: 0.85rem 1.75rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 12px 24px rgba(108, 152, 255, 0.35);
}

.cta:hover,
.cta:focus-visible {
  transform: translateY(-2px) scale(1.01);
  box-shadow: 0 16px 32px rgba(108, 152, 255, 0.45);
}

.hero {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  align-items: center;
  gap: clamp(2rem, 5vw, 4rem);
  background: linear-gradient(145deg, rgba(25, 27, 53, 0.82), rgba(20, 17, 34, 0.72));
  padding: clamp(2rem, 6vw, 4rem);
  border-radius: 32px;
  border: 1px solid rgba(108, 152, 255, 0.22);
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, rgba(255, 111, 145, 0.35), transparent 65%);
  pointer-events: none;
}

.hero-copy h2 {
  margin: 0 0 0.65rem 0;
  font-size: clamp(1.8rem, 6vw, 2.5rem);
}

.hero-copy p {
  margin: 0 0 1.5rem 0;
  color: var(--muted);
}

.hero-tips {
  margin: 0 0 1.75rem 0;
  padding-left: 1.25rem;
  display: grid;
  gap: 0.6rem;
  color: #d0d6ff;
}

.hero-scene {
  position: relative;
  height: 260px;
  border-radius: 26px;
  background: radial-gradient(circle at 30% 30%, rgba(255, 200, 90, 0.85), rgba(255, 92, 160, 0.65) 32%, transparent 68%),
    radial-gradient(circle at 70% 70%, rgba(140, 95, 255, 0.75), transparent 52%);
  box-shadow: inset 0 0 35px rgba(255, 255, 255, 0.15), 0 25px 45px rgba(6, 4, 20, 0.45);
}

.halo {
  position: absolute;
  inset: 18% 18%;
  background: radial-gradient(circle, rgba(255, 247, 200, 0.85), rgba(255, 127, 80, 0.4), transparent 80%);
  filter: blur(10px);
  animation: breathe 4s ease-in-out infinite;
}

.spark,
.spark.second {
  position: absolute;
  width: 70px;
  height: 70px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.9), rgba(250, 220, 160, 0.3));
  box-shadow: 0 0 45px rgba(255, 199, 120, 0.6);
  animation: drift 6s linear infinite;
}

.spark {
  top: 36%;
  left: 16%;
}

.spark.second {
  width: 52px;
  height: 52px;
  bottom: 26%;
  right: 18%;
  animation-duration: 7s;
  animation-delay: 1.2s;
}

@keyframes breathe {
  0%,
  100% {
    transform: scale(0.95);
    opacity: 0.8;
  }
  50% {
    transform: scale(1.05);
    opacity: 1;
  }
}

@keyframes drift {
  0% {
    transform: translateY(0) scale(1);
  }
  50% {
    transform: translateY(-12px) scale(1.05);
  }
  100% {
    transform: translateY(0) scale(1);
  }
}

.lab {
  display: flex;
  flex-direction: column;
  gap: clamp(2.5rem, 6vw, 4rem);
}

.controls-panel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.control-card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 20px;
  padding: 1.5rem;
  display: grid;
  gap: 1rem;
  backdrop-filter: blur(14px);
  position: relative;
  overflow: hidden;
}

.control-card::before {
  content: '';
  position: absolute;
  inset: -30% -40% auto auto;
  width: 160px;
  height: 160px;
  background: radial-gradient(circle, rgba(124, 92, 255, 0.18), transparent 65%);
  pointer-events: none;
}

.control-card h3 {
  margin: 0;
  font-size: 1.1rem;
}

.control-card p {
  margin: 0;
  color: var(--muted);
}

.pattern-buttons {
  display: grid;
  gap: 0.65rem;
}

.pattern-button {
  background: rgba(19, 21, 38, 0.8);
  color: var(--text);
  border: 1px solid rgba(124, 92, 255, 0.4);
  border-radius: 14px;
  padding: 0.65rem 0.9rem;
  font-size: 0.95rem;
  text-align: left;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.pattern-button.active {
  background: linear-gradient(120deg, rgba(124, 92, 255, 0.9), rgba(107, 225, 255, 0.9));
  color: #05070f;
  border-color: rgba(124, 92, 255, 1);
  transform: translateY(-2px);
}

.pattern-button:focus-visible {
  outline: 2px solid #6be1ff;
  outline-offset: 2px;
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

input[type='range'] {
  width: 100%;
  accent-color: var(--accent);
}

.toggle {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 500;
}

.toggle input {
  width: 20px;
  height: 20px;
}

.timer-display {
  font-size: 2rem;
  font-weight: 600;
  text-align: center;
  letter-spacing: 0.08em;
}

.timer-actions {
  display: flex;
  gap: 0.75rem;
}

.timer-actions button {
  flex: 1;
  background: rgba(124, 92, 255, 0.18);
  border: 1px solid rgba(124, 92, 255, 0.4);
  color: var(--text);
  border-radius: 12px;
  padding: 0.55rem 0.7rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease;
}

.timer-actions button:hover {
  background: rgba(124, 92, 255, 0.35);
}

.pattern-lab {
  display: grid;
  gap: 1.5rem;
}

.pattern-display {
  position: relative;
  min-height: clamp(280px, 55vw, 420px);
  border-radius: 32px;
  overflow: hidden;
  border: 1px solid rgba(124, 92, 255, 0.28);
  box-shadow: 0 32px 60px rgba(3, 8, 24, 0.6);
  transition: filter 0.2s ease;
  filter: brightness(var(--boost));
}

.pattern-display::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
  background-image: linear-gradient(rgba(255, 255, 255, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.07) 1px, transparent 1px);
  background-size: 40px 40px;
}

.pattern-display[data-grid='true']::after {
  opacity: 1;
}

.pattern-display[data-flash='true']::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.7), transparent 70%);
  mix-blend-mode: screen;
  animation: pulse 1.8s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 0.1;
  }
  50% {
    opacity: 1;
  }
}

.sparkle-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(255, 255, 255, 0.3) 2px, transparent 2px);
  background-size: 120px 120px;
  opacity: 0;
  transition: opacity 0.3s ease;
  animation: shimmer 10s linear infinite;
}

.pattern-display[data-sparkles='true'] .sparkle-layer {
  opacity: 0.6;
}

@keyframes shimmer {
  from {
    background-position: 0 0;
  }
  to {
    background-position: 160px 160px;
  }
}

.pattern-info {
  background: rgba(9, 12, 26, 0.8);
  border-radius: 24px;
  padding: 1.75rem;
  border: 1px solid rgba(108, 152, 255, 0.2);
  box-shadow: 0 18px 40px rgba(3, 8, 24, 0.45);
  display: grid;
  gap: 0.9rem;
}

.pattern-info h3 {
  margin: 0;
  font-size: 1.35rem;
}

.pattern-info p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.pattern-info ul {
  margin: 0;
  padding-left: 1.3rem;
  display: grid;
  gap: 0.5rem;
  color: #ced5ff;
}

.experiment-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.5rem;
}

.experiment {
  background: rgba(13, 16, 31, 0.75);
  border-radius: 20px;
  border: 1px solid rgba(124, 92, 255, 0.22);
  padding: 1.5rem;
  display: grid;
  gap: 0.75rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.experiment:hover {
  transform: translateY(-4px);
  box-shadow: 0 22px 40px rgba(5, 8, 28, 0.5);
}

.experiment h3 {
  margin: 0;
  font-size: 1.1rem;
}

.experiment p {
  margin: 0;
  color: var(--muted);
}

.knowledge {
  background: rgba(11, 16, 34, 0.78);
  border-radius: 26px;
  border: 1px solid rgba(124, 92, 255, 0.18);
  padding: clamp(1.75rem, 5vw, 2.75rem);
  display: grid;
  gap: 1.2rem;
}

.knowledge h2 {
  margin: 0;
  font-size: clamp(1.4rem, 5vw, 1.9rem);
}

.knowledge ul {
  margin: 0;
  padding-left: 1.4rem;
  display: grid;
  gap: 0.7rem;
  color: #d4daff;
  line-height: 1.6;
}

.site-footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 2rem;
}

/* Pattern backgrounds */

#pattern-display[data-pattern='gradient'] {
  background: linear-gradient(180deg, #02030a 0%, #080e2b 25%, #14315f 50%, #6fa9ff 75%, #ffffff 100%);
}

#pattern-display[data-pattern='contrast'] {
  background: radial-gradient(circle, #ffffff 8%, #000000 8% 16%, #ffffff 16% 24%, #000000 24% 32%, #ffffff 32% 40%, #000000 40% 48%, transparent 48%),
    radial-gradient(circle at center, #000000 0%, #010104 45%, #ffffff 60%, #000000 80%);
  background-blend-mode: screen;
}

#pattern-display[data-pattern='specular'] {
  background: radial-gradient(circle at center, #ffffff 0%, #ffeab6 8%, rgba(255, 210, 120, 0.8) 12%, rgba(10, 12, 30, 0.95) 35%),
    radial-gradient(circle at 30% 30%, rgba(255, 149, 0, 0.7), transparent 45%),
    radial-gradient(circle at 70% 65%, rgba(120, 210, 255, 0.6), transparent 55%);
  animation: gleam 3.5s ease-in-out infinite;
}

@keyframes gleam {
  0%,
  100% {
    background-position: center;
  }
  50% {
    background-position: 48% 52%;
  }
}

#pattern-display[data-pattern='colorbars'] {
  background: repeating-linear-gradient(
    90deg,
    #ffffff 0 12%,
    #ffeb3b 12% 24%,
    #ff5722 24% 36%,
    #ff00ff 36% 48%,
    #3f51b5 48% 60%,
    #00bcd4 60% 72%,
    #00ff6a 72% 84%,
    #ffffff 84% 100%
  );
}

#pattern-display[data-pattern='neon'] {
  background: radial-gradient(circle at 20% 50%, rgba(255, 0, 120, 0.95), transparent 40%),
    radial-gradient(circle at 60% 25%, rgba(0, 255, 250, 0.9), transparent 35%),
    radial-gradient(circle at 80% 70%, rgba(124, 92, 255, 0.95), transparent 40%),
    #050812;
  animation: neonFlow 6s ease-in-out infinite;
}

@keyframes neonFlow {
  0%,
  100% {
    filter: saturate(1);
  }
  50% {
    filter: saturate(1.3);
  }
}

#pattern-display[data-pattern='sunset'] {
  background: linear-gradient(180deg, #060b18 0%, #131d38 20%, #ff7b54 55%, #ffd56f 75%, #fff5d6 100%);
  background-size: 100% 100%;
}

.pattern-display::before {
  pointer-events: none;
}

@media (max-width: 720px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .cta {
    width: 100%;
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .hero-scene {
    height: 220px;
  }

  .app-shell {
    padding-inline: clamp(1rem, 5vw, 2rem);
  }
}

@media (max-width: 420px) {
  .controls-panel {
    grid-template-columns: 1fr;
  }

  .pattern-display {
    min-height: 320px;
  }
}