:root {
  --bg: #071118;
  --panel: rgba(11, 22, 33, 0.84);
  --border: rgba(173, 225, 255, 0.18);
  --text: #eef7fb;
  --muted: #aac4d2;
  --accent: #7fe7ff;
  --accent-warm: #fbbf7d;
  --shadow: rgba(0, 0, 0, 0.34);
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: dark;
}

body {
  margin: 0;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  font-family: "Trebuchet MS", "Gill Sans", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 20%, rgba(127, 231, 255, 0.12), transparent 24%),
    radial-gradient(circle at 86% 14%, rgba(251, 191, 125, 0.12), transparent 18%),
    linear-gradient(180deg, #040b11 0%, #071118 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  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: 34px 34px;
  mask-image: radial-gradient(circle at center, black 28%, transparent 90%);
  opacity: 0.24;
}

.background-orbit {
  position: fixed;
  border-radius: 999px;
  filter: blur(20px);
  opacity: 0.38;
  pointer-events: none;
}

.orbit-a {
  width: 320px;
  height: 320px;
  top: -110px;
  left: -70px;
  background: rgba(127, 231, 255, 0.22);
}

.orbit-b {
  width: 380px;
  height: 380px;
  right: -120px;
  bottom: -120px;
  background: rgba(251, 191, 125, 0.18);
}

.site-shell {
  position: relative;
  z-index: 1;
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 40px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 24px;
}

.brand {
  color: var(--text);
  text-decoration: none;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
}

.progress-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.progress-nav a {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  text-decoration: none;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.progress-nav a.is-current {
  color: #081018;
  background: linear-gradient(180deg, var(--accent), #c8f5ff);
  border-color: transparent;
}

.progress-nav a:hover {
  color: var(--text);
  border-color: rgba(127, 231, 255, 0.26);
}

.slide-card {
  background: linear-gradient(180deg, rgba(13, 29, 42, 0.94), var(--panel));
  border: 1px solid var(--border);
  border-radius: 30px;
  box-shadow: 0 28px 60px var(--shadow);
  padding: 32px;
}

.hero-panel {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 28px;
  align-items: center;
  min-height: calc(100vh - 180px);
}

.content-panel {
  display: grid;
  gap: 28px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.82rem;
}

h1,
h2 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  line-height: 0.95;
}

h1 {
  font-size: clamp(2.6rem, 6vw, 5rem);
}

h2 {
  font-size: clamp(1.25rem, 2vw, 1.8rem);
  margin-bottom: 12px;
}

.hero-lead,
.hero-support,
.content-block p,
.quote-card p,
.feature-card p,
.mini-card p,
.link-meta p,
.slider-heading p,
.feedback-copy,
.pager-note,
.prompt-note,
.clean-list li {
  color: var(--muted);
  line-height: 1.7;
}

.hero-lead {
  max-width: 18ch;
  margin: 18px 0 0;
  font-size: clamp(1.15rem, 2vw, 1.5rem);
}

.hero-support {
  max-width: 58ch;
  margin: 20px 0 0;
}

.content-intro .hero-lead {
  max-width: 60ch;
}

.memory-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.memory-tags span,
.feedback-tag,
.feature-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: rgba(127, 231, 255, 0.12);
  color: #ddf9ff;
  padding: 0.45rem 0.8rem;
  border: 1px solid rgba(127, 231, 255, 0.22);
}

.hero-actions {
  margin-top: 32px;
}

.button-primary,
.pager-prev,
.pager-next {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.8rem 1.15rem;
  border-radius: 999px;
  background: linear-gradient(180deg, #d4f8ff 0%, #7fe7ff 100%);
  color: #071118;
  text-decoration: none;
  font-weight: 700;
}

.button-primary:hover,
.pager-prev:hover,
.pager-next:hover {
  filter: brightness(1.05);
}

.credit {
  margin: 12px 0 0;
  color: var(--muted);
}

.hero-visual {
  position: relative;
  min-height: 520px;
}

.memory-core {
  position: relative;
  width: min(100%, 440px);
  aspect-ratio: 1;
  margin: 0 auto;
  display: grid;
  place-items: center;
}

.memory-ring {
  position: absolute;
  border: 1px solid rgba(127, 231, 255, 0.2);
  border-radius: 999px;
}

.ring-1 {
  inset: 16%;
}

.ring-2 {
  inset: 7%;
}

.ring-3 {
  inset: 0;
  border-style: dashed;
}

.memory-center {
  width: 45%;
  aspect-ratio: 1;
  border-radius: 999px;
  display: grid;
  place-items: center;
  text-align: center;
  background:
    radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.42), transparent 26%),
    linear-gradient(180deg, rgba(127, 231, 255, 0.4), rgba(127, 231, 255, 0.08));
  border: 1px solid rgba(127, 231, 255, 0.28);
  box-shadow: 0 0 40px rgba(127, 231, 255, 0.2);
}

.memory-center span {
  display: block;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: #d9f6ff;
  font-size: 0.78rem;
}

.memory-center strong {
  font-size: 1.2rem;
}

.signal-card,
.quote-card,
.content-block,
.mini-card,
.feature-card,
.media-card,
.slider-panel {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 22px;
  padding: 22px;
}

.signal-card {
  position: absolute;
  max-width: 240px;
  backdrop-filter: blur(10px);
}

.signal-a {
  top: 8%;
  right: -2%;
}

.signal-b {
  left: 0;
  bottom: 8%;
}

.signal-label,
.quote-label {
  display: block;
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent);
  font-size: 0.76rem;
}

.content-intro {
  max-width: 68ch;
}

.two-column {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
  gap: 20px;
}

.two-column.stretch {
  align-items: stretch;
}

.legacy-split {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  gap: 22px;
  align-items: start;
}

.role-column,
.visual-column {
  min-height: 100%;
}

.visual-column img {
  background: rgba(255, 255, 255, 0.92);
  padding: 10px;
  filter: blur(4px);
}

.three-up,
.feature-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.feature-card {
  min-height: 100%;
}

.feature-number {
  width: fit-content;
  margin-bottom: 14px;
  font-weight: 700;
}

.clean-list {
  margin: 0;
  padding-left: 20px;
}

.prompt-note {
  margin-top: 18px;
}

.media-card {
  display: grid;
  align-content: start;
  gap: 12px;
}

.media-card img {
  width: 100%;
  display: block;
  border-radius: 16px;
}

.media-card figcaption {
  color: var(--muted);
  font-size: 0.92rem;
}

.image-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.6;
}

.link-card {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 18px;
  align-items: stretch;
  text-decoration: none;
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 24px;
  overflow: hidden;
}

.link-card.wide {
  grid-template-columns: 190px minmax(0, 1fr);
}

.link-card:hover {
  border-color: rgba(127, 231, 255, 0.28);
  box-shadow: 0 18px 36px rgba(0, 0, 0, 0.2);
}

.link-thumb {
  min-height: 160px;
  display: grid;
  place-items: end start;
  padding: 18px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.4rem;
  color: #081018;
  background: linear-gradient(135deg, #d4f8ff 0%, #7fe7ff 45%, #fbbf7d 100%);
}

.thumb-rip {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.3), transparent 50%),
    linear-gradient(135deg, #ffd8bd 0%, #fbbf7d 100%);
}

.thumb-springer {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.34), transparent 50%),
    linear-gradient(135deg, #d2ffe1 0%, #8ef4b6 100%);
}

.thumb-doi {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.34), transparent 50%),
    linear-gradient(135deg, #ddf3ff 0%, #7fe7ff 100%);
}

.thumb-survey {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.34), transparent 50%),
    linear-gradient(135deg, #ffd2d2 0%, #ff9f9f 100%);
}

.link-meta {
  padding: 18px 20px 18px 0;
}

.link-meta strong {
  display: block;
  font-size: 1.15rem;
}

.link-url {
  display: inline-block;
  margin-top: 10px;
  color: var(--accent);
  word-break: break-word;
}

.slider-panel {
  display: grid;
  gap: 18px;
}

.slider-scale {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  font-size: 0.92rem;
  color: var(--muted);
}

.slider-scale span:last-child {
  text-align: right;
}

.legacy-slider {
  width: 100%;
  appearance: none;
  height: 12px;
  border-radius: 999px;
  background: linear-gradient(90deg, #ff8b8b 0%, #fbbf7d 35%, #7fe7ff 68%, #aaf0ae 100%);
  outline: none;
}

.legacy-slider::-webkit-slider-thumb {
  appearance: none;
  width: 28px;
  height: 28px;
  border-radius: 999px;
  background: #f9fdff;
  border: 3px solid #081018;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.22);
  cursor: pointer;
}

.legacy-slider::-moz-range-thumb {
  width: 28px;
  height: 28px;
  border-radius: 999px;
  background: #f9fdff;
  border: 3px solid #081018;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.22);
  cursor: pointer;
}

.slider-feedback {
  display: grid;
  gap: 10px;
}

.feedback-tag {
  width: fit-content;
  margin: 0;
}

.feedback-copy {
  margin: 0;
  max-width: 62ch;
}

.pager {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 18px;
}

.pager-note {
  flex: 1;
  margin: 0;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 900px) {
  .hero-panel,
  .two-column,
  .legacy-split,
  .three-up,
  .feature-list {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    min-height: 420px;
  }

  .signal-a,
  .signal-b {
    position: relative;
    top: auto;
    right: auto;
    left: auto;
    bottom: auto;
    margin-top: 16px;
  }
}

@media (max-width: 720px) {
  .site-shell {
    width: min(100%, calc(100% - 24px));
    padding-top: 16px;
    padding-bottom: 28px;
  }

  .topbar,
  .pager {
    flex-direction: column;
    align-items: stretch;
  }

  .slide-card {
    padding: 22px;
    border-radius: 24px;
  }

  .hero-panel {
    min-height: auto;
  }

  .link-card,
  .link-card.wide {
    grid-template-columns: 1fr;
  }

  .link-thumb {
    min-height: 120px;
  }

  .link-meta {
    padding: 0 18px 18px;
  }

  .slider-scale {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    row-gap: 8px;
  }

  .slider-scale span:nth-child(2),
  .slider-scale span:nth-child(4) {
    text-align: right;
  }
}