/* ─────────────────────────────────────────────────────────────
   Page 09 — Motion
   ───────────────────────────────────────────────────────────── */

/* The three motion principles, paired with live demos */
.motion-principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
@media (max-width: 900px) { .motion-principles { grid-template-columns: 1fr; } }
.motion-card {
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: rgba(255,255,255,0.02);
  display: flex;
  flex-direction: column;
}
.motion-card .stage {
  height: 200px;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse 80% 100% at 50% 50%, rgba(47,55,255,0.15), transparent 60%),
    linear-gradient(180deg, #000000, #050818);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
}
.motion-card .stage::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle, rgba(255,255,255,0.5) 0.5px, transparent 0.5px);
  background-size: 90px 90px;
  background-position: 10px 10px;
  opacity: 0.4;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black, transparent);
}
.motion-card .info {
  padding: 20px 22px 24px;
}
.motion-card .info .n {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue-300);
  margin-bottom: 6px;
}
.motion-card .info h4 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.014em;
  margin: 0 0 8px;
}
.motion-card .info p {
  font-size: 13.5px;
  color: var(--fg-secondary);
  line-height: 1.55;
  margin: 0 0 14px;
}
.motion-card .info .specs {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--fg-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.motion-card .info .specs span {
  padding: 4px 9px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-full);
  background: rgba(255,255,255,0.02);
}

/* Orbit demo svg */
.orbit-demo svg {
  width: 80%;
  height: 80%;
  overflow: visible;
}
.orbit-demo .o-ring {
  fill: none;
  stroke: rgba(133,160,255,0.5);
  stroke-width: 1;
}
.orbit-demo .o-spin-1 { animation: spin 18s linear infinite; transform-origin: center; }
.orbit-demo .o-spin-2 { animation: spin 12s linear infinite reverse; transform-origin: center; }

/* Drift — slow horizontal float */
.drift-demo {
  position: relative;
  width: 100%;
  height: 100%;
}
.drift-demo .star {
  position: absolute;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: #FFFFFF;
  filter: drop-shadow(0 0 6px rgba(133,160,255,0.8));
  animation: drift 8s ease-in-out infinite;
}
.drift-demo .star:nth-child(1) { top: 30%; left: 12%; animation-delay: 0s; }
.drift-demo .star:nth-child(2) { top: 56%; left: 38%; background: #85A0FF; animation-delay: 1.5s; }
.drift-demo .star:nth-child(3) { top: 22%; left: 62%; background: #C2B3FF; animation-delay: 3s; }
.drift-demo .star:nth-child(4) { top: 68%; left: 78%; background: #69FDF8; animation-delay: 4.5s; }
@keyframes drift {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(18px, -8px); }
}

/* Settle — entrance: opacity 0 + 8px down → 1 + 0 */
.settle-demo {
  display: flex;
  align-items: center;
  justify-content: center;
}
.settle-demo .blocks {
  display: flex;
  gap: 6px;
}
.settle-demo .blk {
  width: 36px;
  height: 60px;
  border-radius: 4px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.18);
  animation: settle 2.8s cubic-bezier(0.22, 1, 0.36, 1) infinite;
  opacity: 0;
  transform: translateY(8px);
}
.settle-demo .blk:nth-child(1) { animation-delay: 0s; }
.settle-demo .blk:nth-child(2) { animation-delay: 0.12s; }
.settle-demo .blk:nth-child(3) { animation-delay: 0.24s; }
.settle-demo .blk:nth-child(4) { animation-delay: 0.36s; }
@keyframes settle {
  0% { opacity: 0; transform: translateY(8px); }
  25%, 75% { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(-4px); }
}

/* Duration ladder */
.duration-ladder {
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  overflow: hidden;
}
.duration-ladder .row {
  display: grid;
  grid-template-columns: 140px 100px 1fr 1fr;
  align-items: center;
  padding: 14px 22px;
  border-bottom: 1px solid var(--border-subtle);
  gap: 24px;
}
.duration-ladder .row:last-child { border-bottom: 0; }
@media (max-width: 820px) {
  .duration-ladder .row { grid-template-columns: 100px 1fr; }
  .duration-ladder .row .dur, .duration-ladder .row .ex { display: none; }
}
.duration-ladder .row.head {
  background: rgba(255,255,255,0.025);
  padding: 12px 22px;
}
.duration-ladder .row.head > div {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.duration-ladder .name {
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.005em;
  color: var(--fg-default);
}
.duration-ladder .dur {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--blue-300);
  letter-spacing: 0.04em;
}
.duration-ladder .use {
  font-size: 13.5px;
  color: var(--fg-secondary);
  line-height: 1.5;
}
.duration-ladder .ex {
  display: flex;
  align-items: center;
  height: 18px;
  position: relative;
}
.duration-ladder .ex .bar {
  height: 2px;
  background: linear-gradient(90deg, var(--blue-400), var(--blue-300));
  border-radius: 2px;
  border-right: 1px solid var(--fg-muted);
}

/* Easing curves visual */
.easing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
@media (max-width: 820px) { .easing-grid { grid-template-columns: repeat(2, 1fr); } }
.easing-card {
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: 0;
  background: rgba(255,255,255,0.02);
  overflow: hidden;
}
.easing-card .plot {
  height: 130px;
  position: relative;
  border-bottom: 1px solid var(--border-subtle);
  background:
    repeating-linear-gradient(0deg, rgba(255,255,255,0.04) 0 1px, transparent 1px 16px),
    repeating-linear-gradient(90deg, rgba(255,255,255,0.04) 0 1px, transparent 1px 16px);
}
.easing-card .plot svg { width: 100%; height: 100%; }
.easing-card .plot path { fill: none; stroke: var(--blue-300); stroke-width: 2; stroke-linecap: round; }
.easing-card .info { padding: 14px 18px 16px; }
.easing-card .info h5 {
  font-size: 14px;
  font-weight: 600;
  margin: 0 0 2px;
}
.easing-card .info code {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--blue-300);
  letter-spacing: 0.02em;
  margin: 0 0 6px;
  display: block;
}
.easing-card .info p {
  font-size: 12px;
  color: var(--fg-muted);
  line-height: 1.5;
  margin: 0;
}

/* Motion don'ts */
.motion-donts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
@media (max-width: 820px) { .motion-donts { grid-template-columns: 1fr; } }
.motion-dont {
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: rgba(255,255,255,0.02);
}
.motion-dont .stage {
  height: 130px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(255,255,255,0.02);
}
.motion-dont .stage::after {
  content: "";
  position: absolute;
  left: 14%;
  right: 14%;
  top: 50%;
  height: 2px;
  background: var(--orange-500);
  transform: rotate(-10deg);
  z-index: 2;
}
.motion-dont .stage .demo-element {
  padding: 12px 22px;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.08);
  color: var(--fg-default);
  font-size: 13px;
  font-weight: 500;
}
.motion-dont .stage.bouncing .demo-element { animation: badBounce 0.6s ease-in-out infinite; }
.motion-dont .stage.shaking .demo-element { animation: badShake 0.25s ease-in-out infinite; }
.motion-dont .stage.flashing .demo-element { animation: badFlash 0.4s ease-in-out infinite; }
@keyframes badBounce { 0%,100% { transform: translateY(-12px); } 50% { transform: translateY(6px); } }
@keyframes badShake { 0%,100% { transform: translateX(-4px); } 50% { transform: translateX(4px); } }
@keyframes badFlash { 0%,100% { opacity: 1; } 50% { opacity: 0.3; } }
.motion-dont .info {
  padding: 14px 18px 18px;
}
.motion-dont .info .x {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--orange-300);
  margin-bottom: 6px;
}
.motion-dont .info h5 {
  font-size: 14px;
  font-weight: 600;
  margin: 0 0 4px;
}
.motion-dont .info p {
  font-size: 12.5px;
  color: var(--fg-muted);
  line-height: 1.5;
  margin: 0;
}