/* Shared dark animated background + layout */
*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --bg-deep: #0a0a0f;
  --bg-mid: #12121c;
  --accent: #6366f1;
  --accent-dim: #4f46e5;
  --text: #e8e8ed;
  --text-muted: #9898a8;
  --panel-bg: rgba(18, 18, 28, 0.72);
  --panel-border: rgba(255, 255, 255, 0.08);
  --glow: rgba(99, 102, 241, 0.35);
}

html {
  height: 100%;
}

body {
  margin: 0;
  min-height: 100%;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: var(--bg-deep);
  overflow-x: hidden;
}

/* Animated mesh background */
.bg-stage {
  position: fixed;
  inset: 0;
  z-index: 0;
  background: var(--bg-deep);
  overflow: hidden;
}

.bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
  animation: float-orb 18s ease-in-out infinite;
}

.bg-orb:nth-child(1) {
  width: min(55vw, 420px);
  height: min(55vw, 420px);
  background: radial-gradient(circle, #4338ca 0%, transparent 70%);
  top: -10%;
  left: -15%;
  animation-delay: 0s;
}

.bg-orb:nth-child(2) {
  width: min(50vw, 380px);
  height: min(50vw, 380px);
  background: radial-gradient(circle, #7c3aed 0%, transparent 70%);
  bottom: -15%;
  right: -10%;
  animation-delay: -6s;
}

.bg-orb:nth-child(3) {
  width: min(45vw, 340px);
  height: min(45vw, 340px);
  background: radial-gradient(circle, #0d9488 0%, transparent 70%);
  top: 40%;
  left: 50%;
  animation-name: float-orb-center;
  animation-delay: -12s;
  opacity: 0.35;
}

@keyframes float-orb {
  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }
  33% {
    transform: translate(8%, 5%) scale(1.08);
  }
  66% {
    transform: translate(-5%, 8%) scale(0.95);
  }
}

@keyframes float-orb-center {
  0%,
  100% {
    transform: translate(-50%, -50%) scale(1);
  }
  33% {
    transform: translate(calc(-50% + 4vw), calc(-50% + 3vh)) scale(1.08);
  }
  66% {
    transform: translate(calc(-50% - 2.5vw), calc(-50% + 4vh)) scale(0.95);
  }
}

.bg-grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(
      rgba(255, 255, 255, 0.03) 1px,
      transparent 1px
    ),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  animation: grid-drift 40s linear infinite;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 50%, black 20%, transparent 100%);
}

@keyframes grid-drift {
  0% {
    background-position: 0 0, 0 0;
  }
  100% {
    background-position: 48px 48px, 48px 48px;
  }
}

.bg-vignette {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 90% 80% at 50% 50%, transparent 0%, var(--bg-deep) 100%);
  pointer-events: none;
}

/* Page content */
.page-wrap {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.25rem;
}

.back-link {
  position: absolute;
  top: 1.25rem;
  left: 1.25rem;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.back-link:hover {
  color: var(--text);
}

.panel {
  width: 100%;
  max-width: 420px;
  padding: 2rem 1.75rem;
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(255, 255, 255, 0.04) inset;
}

.panel h1 {
  margin: 0 0 0.35rem;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.panel .subtitle {
  margin: 0 0 1.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.nav-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.btn {
  display: block;
  width: 100%;
  padding: 0.85rem 1.25rem;
  font-size: 1rem;
  font-weight: 500;
  font-family: inherit;
  color: var(--text);
  text-align: center;
  text-decoration: none;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dim) 100%);
  box-shadow: 0 4px 20px var(--glow);
  transition: transform 0.15s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.08);
  box-shadow: 0 8px 28px var(--glow);
}

.btn:active {
  transform: translateY(0);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  box-shadow: none;
  border: 1px solid var(--panel-border);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

/* Forms */
.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.form-group input {
  width: 100%;
  padding: 0.65rem 0.85rem;
  font-size: 1rem;
  font-family: ui-monospace, "Cascadia Code", monospace;
  color: var(--text);
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus {
  border-color: rgba(99, 102, 241, 0.5);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.result-row {
  margin-top: 1rem;
}

.result-row input[readonly] {
  background: rgba(99, 102, 241, 0.12);
  border-color: rgba(99, 102, 241, 0.25);
  font-size: 1.25rem;
  text-align: center;
}

/* Color generator */
.color-preview {
  width: 100%;
  height: 120px;
  border-radius: 12px;
  margin-bottom: 1rem;
  border: 1px solid var(--panel-border);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.06);
  transition: background-color 0.35s ease;
}

.color-hex {
  font-size: 1.35rem;
  letter-spacing: 0.08em;
  text-align: center;
  margin-bottom: 1rem;
  font-family: ui-monospace, "Cascadia Code", monospace;
  color: var(--text);
}