/* Depth landing — full-viewport practice demo, explore-gated descent */

.landing-depth {
  --header-h: 52px;
  --header-offset: calc(var(--header-h) + var(--safe-top));
  --font-serif: "Cormorant Garamond", Georgia, serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
}

.landing-depth.view-game {
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

.landing-depth.view-explore {
  overflow-y: auto;
  overflow-x: hidden;
}

.landing-depth ::selection {
  background: #ffffff;
  color: var(--bg);
}

.landing-depth .slice--light ::selection {
  background: #090b0e;
  color: #ffffff;
}

/* Header */
.landing-depth .glass-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 300;
  height: var(--header-offset);
  box-sizing: border-box;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--safe-top) max(clamp(1rem, 4vw, 2rem), var(--safe-right)) 0 max(clamp(1rem, 4vw, 2rem), var(--safe-left));
  background: var(--glass-bg);
  backdrop-filter: blur(28px) saturate(1.85);
  -webkit-backdrop-filter: blur(28px) saturate(1.85);
  border-bottom: 1px solid var(--glass-border);
}

.landing-depth .logo-lockup {
  display: flex;
  align-items: center;
}

.landing-depth .logo-lockup .logo-icon {
  width: 26px;
  height: 26px;
}

.landing-depth .nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  margin: 0 -10px 0 auto;
  background: none;
  border: none;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.landing-depth .nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.landing-depth .glass-header.nav-open .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.landing-depth .glass-header.nav-open .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.landing-depth .glass-header.nav-open .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

body.nav-menu-open {
  overflow: hidden;
}

.landing-depth .glass-nav {
  display: flex;
  align-items: center;
  gap: clamp(0.65rem, 2vw, 1.25rem);
}

.landing-depth .glass-nav .nav-mode-btn,
.landing-depth .glass-nav .nav-link {
  font-size: 0.78rem;
  color: var(--text-secondary);
  transition: color 0.15s;
  background: none;
  border: none;
  padding: 0;
  font-family: var(--font);
  cursor: pointer;
}

.landing-depth .glass-nav .nav-mode-btn:hover,
.landing-depth .glass-nav .nav-link:hover {
  color: var(--text);
}

.landing-depth.view-game #btn-game {
  display: none;
}

.landing-depth.view-explore #btn-explore {
  display: none;
}

.landing-depth .glass-nav .nav-link-active {
  color: var(--text);
}

/* View layers — fade between game and explore */
.view-layer {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.36s ease, visibility 0.36s ease;
}

.view-layer.active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

#game-view {
  position: fixed;
  inset: var(--header-offset) 0 0;
  overflow-y: auto;
  z-index: 10;
}

#explore-view {
  position: relative;
  z-index: 5;
  padding-top: var(--header-offset);
  min-height: 100vh;
  min-height: 100dvh;
}

.landing-depth.view-game #explore-view {
  position: fixed;
  inset: 0;
  padding-top: 0;
  overflow: hidden;
}

.landing-depth.view-explore #game-view {
  position: fixed;
  inset: 0;
  padding-top: 0;
  overflow: hidden;
}

/* Landing hero — explore first 100vh CTA */
.landing-hero {
  min-height: calc(100vh - var(--header-offset));
  min-height: calc(100dvh - var(--header-offset));
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem max(clamp(1.25rem, 5vw, 3rem), var(--safe-right)) calc(2rem + var(--safe-bottom)) max(clamp(1.25rem, 5vw, 3rem), var(--safe-left));
  background:
    radial-gradient(ellipse 75% 55% at 50% 0%, rgba(107, 140, 184, 0.12), transparent 58%),
    linear-gradient(180deg, #0a0e14 0%, #090b0e 100%);
}

.landing-hero-inner {
  max-width: 40rem;
  text-align: center;
}

.landing-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--blue-hint);
  margin-bottom: 1rem;
}

.landing-hero h1 {
  font-size: clamp(2.5rem, 8vw, 4.25rem);
  font-weight: 600;
  letter-spacing: -0.045em;
  line-height: 0.95;
  margin-bottom: 1rem;
}

.landing-lead {
  color: var(--text-secondary);
  line-height: 1.55;
  font-size: 1.05rem;
  margin-bottom: 2rem;
  max-width: 36ch;
  margin-inline: auto;
}

.landing-hero-actions {
  display: flex;
  gap: 0.65rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.landing-hero-note {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.landing-completed-section {
  padding: clamp(4rem, 10vw, 6.5rem) max(clamp(1.25rem, 5vw, 3rem), var(--safe-right)) clamp(4rem, 10vw, 6.5rem) max(clamp(1.25rem, 5vw, 3rem), var(--safe-left));
  border-top: 1px solid var(--border);
  background:
    radial-gradient(ellipse 70% 80% at 50% 100%, rgba(107, 140, 184, 0.08), transparent 55%),
    linear-gradient(180deg, #090b0e 0%, #0a0e14 100%);
}

.landing-completed-inner {
  max-width: 28rem;
  margin: 0 auto;
  text-align: center;
}

.landing-completed-section .landing-eyebrow {
  margin-bottom: 0.85rem;
}

.landing-completed-section h2 {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 0.75rem;
}

.landing-completed-lead {
  color: var(--text-secondary);
  line-height: 1.55;
  font-size: 1rem;
  margin-bottom: 2rem;
  max-width: 32ch;
  margin-inline: auto;
}

.landing-completed {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.landing-completed-val {
  font-size: clamp(3.5rem, 12vw, 5.5rem);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.045em;
  line-height: 0.95;
  color: var(--text);
}

.landing-depth .glass-nav .nav-cta {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: var(--on-accent);
}

.landing-depth .glass-nav .nav-cta:hover {
  opacity: 0.9;
  color: var(--on-accent);
}

/* Full-viewport demo */
#game-view .demo-viewport {
  height: 100%;
  padding-top: 0.75rem;
  padding-left: max(1.5rem, var(--safe-left));
  padding-right: max(1.5rem, var(--safe-right));
  padding-bottom: max(1rem, var(--safe-bottom));
}

.demo-viewport {
  height: 100vh;
  height: 100dvh;
  padding: var(--header-offset) max(1.5rem, var(--safe-right)) var(--safe-bottom) max(1.5rem, var(--safe-left));
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(ellipse 80% 50% at 50% 0%, rgba(107, 140, 184, 0.08), transparent 55%),
    var(--bg);
}

.demo-shell {
  flex: 1;
  min-height: 0;
  width: 100%;
  max-width: 920px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}

.demo-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: clamp(1.1rem, 3.5vw, 1.75rem) 0.15rem;
}

.demo-step {
  display: none;
  min-height: 100%;
}

.demo-step.active {
  display: flex;
  flex-direction: column;
}

.demo-topic-card {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1.5rem 0.15rem;
  border: none;
  background: transparent;
  box-shadow: none;
  gap: 0;
}

.demo-topic-card.shuffling .demo-topic-title {
  opacity: 0.85;
}

.demo-topic-title {
  font-size: clamp(1.35rem, 3.5vw, 1.9rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  margin: 0.65rem 0 0.5rem;
}

.demo-topic-prompt {
  color: var(--text-secondary);
  line-height: 1.5;
  max-width: 34rem;
  margin: 0 auto 1.15rem;
}

.demo-topic-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 1.15rem;
}

.demo-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}

.demo-research-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0 0 0.85rem;
  margin-bottom: 0.85rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.demo-research-header h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.demo-research {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  overflow-y: auto;
}

@media (max-width: 700px) {
  .demo-research { grid-template-columns: 1fr; }
}

.demo-research .section-title {
  margin-bottom: 0.65rem;
}

.demo-source {
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
}

.demo-source h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.demo-source .site {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}

.demo-source p {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.45;
  margin-bottom: 0.45rem;
}

.demo-source-toggle {
  margin-bottom: 0.35rem;
}

.demo-source-notes {
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}

.demo-source-bullets {
  margin: 0 0 0.75rem;
  padding-left: 1.1rem;
  list-style: disc;
}

.demo-source-bullets li {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 0.55rem;
}

.demo-source-bullets li:last-child {
  margin-bottom: 0.35rem;
}

.demo-empty {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.demo-search-hit {
  display: block;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 0.35rem;
  font-size: var(--text-sm);
  transition: border-color 0.15s;
}

.demo-search-hit:hover {
  border-color: var(--border-strong);
}

.demo-search-hit small {
  display: block;
  color: var(--text-muted);
  font-size: var(--text-xs);
  margin-top: 0.15rem;
}

.demo-notes {
  width: 100%;
  min-height: 140px;
  padding: 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font);
  font-size: var(--text-sm);
  resize: vertical;
}

.demo-notes:focus {
  outline: none;
  border-color: var(--blue-hint);
}

.demo-step-footer {
  text-align: center;
  padding-top: 1rem;
  flex-shrink: 0;
}

.demo-speak {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1.5rem 1rem;
  border: none;
  background: transparent;
  box-shadow: none;
}

.demo-speak h3 {
  font-size: var(--text-xl);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.demo-speak p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.demo-timer {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 8vw, 3rem);
  letter-spacing: -0.04em;
  margin-bottom: 1.25rem;
}

.demo-timer.urgent {
  color: var(--blue-light);
}

.demo-locked {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1.5rem 1rem;
  border: none;
  background: transparent;
  box-shadow: none;
}

.demo-locked .lock-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 1rem;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--blue-hint);
}

.demo-locked h3 {
  font-size: var(--text-xl);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.demo-locked p {
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 1.25rem;
  max-width: 28rem;
}

.demo-locked .score-preview {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  width: 100%;
  max-width: 20rem;
}

.demo-locked .score-preview div {
  padding: 0.75rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  filter: blur(4px);
  opacity: 0.5;
  user-select: none;
}

.demo-locked .score-preview span {
  display: block;
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

/* Below fold */
.descent-zone {
  position: relative;
  height: 320vh;
  background: linear-gradient(
    180deg,
    #090b0e 0%,
    #0a0e14 25%,
    #080c12 55%,
    #060a0f 80%,
    #04080c 100%
  );
}

.descent-zone::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    180deg,
    transparent 0,
    transparent 119px,
    rgba(107, 140, 184, 0.04) 119px,
    rgba(107, 140, 184, 0.04) 120px
  );
  pointer-events: none;
  opacity: calc(0.1 + var(--depth, 0) * 0.4);
}

.descent-sticky {
  position: sticky;
  top: var(--header-offset);
  height: calc(100vh - var(--header-offset));
  height: calc(100dvh - var(--header-offset));
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem max(clamp(1rem, 4vw, 2.5rem), var(--safe-right)) calc(2rem + var(--safe-bottom)) max(clamp(1rem, 4vw, 2.5rem), var(--safe-left));
}

/* Depth HUD — inside descent only, desktop */
.descent-sticky .anchor-hud {
  position: absolute;
  left: clamp(1.25rem, 4vw, 3rem);
  top: calc(12% + var(--anchor-drop, 0%) * 0.55);
  display: flex;
  gap: 0.85rem;
  align-items: stretch;
  pointer-events: none;
  z-index: 2;
}

@media (max-width: 768px) {
  .descent-sticky .anchor-hud { display: none; }
}

.depth-rail {
  width: 3px;
  border-radius: 999px;
  background: rgba(107, 140, 184, 0.12);
  position: relative;
  min-height: 72px;
  align-self: stretch;
}

.depth-rail-fill {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 0%;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--blue-light), var(--blue-hint));
}

.depth-rail-marker {
  position: absolute;
  left: 50%;
  top: 0%;
  width: 9px;
  height: 9px;
  margin-left: -4.5px;
  margin-top: -4.5px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 0 3px rgba(107, 140, 184, 0.35);
}

.depth-card {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  padding: 0.85rem 1rem;
  border: 1px solid rgba(148, 163, 184, 0.16);
  border-radius: var(--radius);
  background: rgba(13, 16, 22, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  min-width: 9rem;
}

.anchor-icon {
  width: 22px;
  height: 22px;
  color: var(--blue-hint);
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.depth-hud {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.depth-label {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.depth-hud strong {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--text);
  line-height: 1.1;
}

.depth-unit {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.zone-label {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue-hint);
  margin-top: 0.15rem;
}

/* Crossfade panels — one at a time */
.descent-panels {
  position: relative;
  width: 100%;
  max-width: 520px;
  min-height: min(420px, 55vh);
  margin: 0 auto;
}

.app-panel {
  position: absolute;
  inset: 0;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(13, 16, 22, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.12s linear, visibility 0.12s linear;
}

.app-panel .roman {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  color: var(--blue-hint);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

.app-panel h3 {
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.app-panel p {
  color: var(--text-secondary);
  line-height: 1.5;
  font-size: 0.95rem;
}

.app-panel .mini-ui {
  margin-top: 1rem;
  padding: 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-muted);
  font-size: var(--text-sm);
}

.app-panel .mini-stat {
  display: flex;
  justify-content: space-between;
  padding: 0.35rem 0;
  border-bottom: 1px solid var(--border-subtle);
}

.app-panel .mini-stat:last-child { border-bottom: none; }

.protocol-strip {
  padding: 5rem clamp(1rem, 4vw, 2.5rem);
  border-top: 1px solid var(--border);
  background: #080c12;
}

.protocol-strip h2 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 600;
  text-align: center;
  margin-bottom: 0.75rem;
  letter-spacing: -0.03em;
}

.protocol-strip .sub {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: 3rem;
  font-size: 0.95rem;
}

.protocol-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  max-width: 920px;
  margin: 0 auto;
}

@media (max-width: 800px) {
  .protocol-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .protocol-grid { grid-template-columns: 1fr; }
}

.protocol-cell {
  background: var(--bg-secondary);
  padding: 1.75rem 1.25rem;
  min-height: 14rem;
}

.protocol-cell .roman {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--blue-hint);
  letter-spacing: 0.12em;
  margin-bottom: 1rem;
}

.protocol-cell h3 {
  font-size: var(--text-md);
  font-weight: 600;
  margin-bottom: 0.45rem;
  letter-spacing: -0.02em;
}

.protocol-cell p {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.45;
}

.final-cta {
  background: linear-gradient(180deg, #080c12 0%, #090b0e 100%);
  color: var(--text);
  padding: clamp(4rem, 10vw, 6rem) 1.5rem;
  border-top: 1px solid var(--border);
}

.final-cta-inner {
  max-width: 36rem;
  margin: 0 auto;
  text-align: center;
}

.final-cta h2 {
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 0.85rem;
  color: var(--text);
}

.final-cta .fathoming {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 500;
  color: var(--blue-light);
}

.final-cta p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
  line-height: 1.5;
}

.landing-footer {
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, var(--bg-secondary), var(--bg));
  padding: clamp(2.5rem, 6vw, 4rem) clamp(1rem, 4vw, 2.5rem) 1.5rem;
}

.landing-footer .footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 2rem 1.5rem;
  max-width: 1080px;
  margin: 0 auto 2.5rem;
}

@media (max-width: 800px) {
  .landing-footer .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .landing-footer .footer-grid { grid-template-columns: 1fr; }
}

.landing-footer .footer-brand img {
  width: 24px;
  height: 24px;
}

.landing-footer .footer-brand .row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.75rem;
}

.landing-footer .footer-brand strong {
  font-size: 0.9rem;
}

.landing-footer .footer-brand p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
  max-width: 22ch;
}

.landing-footer .footer-col h4 {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 0.85rem;
  font-weight: 500;
}

.landing-footer .footer-col a,
.landing-footer .footer-col span {
  display: block;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.55rem;
}

.landing-footer .footer-col a:hover { color: var(--text); }
.landing-footer .footer-col span { color: var(--text-faint); }

.landing-footer .footer-bottom {
  max-width: 1080px;
  margin: 0 auto;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.72rem;
  color: var(--text-faint);
}

.landing-footer .footer-bottom a {
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.footer-link-btn {
  display: block;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.55rem;
  background: none;
  border: none;
  padding: 0;
  font-family: var(--font);
  cursor: pointer;
  text-align: left;
}

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

/* About page */
.about-body {
  min-height: 100vh;
  overflow-y: auto;
}

.about-page {
  padding: calc(var(--header-offset) + 3rem) max(clamp(1.25rem, 5vw, 2rem), var(--safe-right)) calc(4rem + var(--safe-bottom)) max(clamp(1.25rem, 5vw, 2rem), var(--safe-left));
  max-width: 42rem;
  margin: 0 auto;
}

.about-eyebrow,
.love-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--blue-hint);
  margin-bottom: 0.85rem;
}

.about-content h1 {
  font-size: clamp(1.85rem, 5vw, 2.75rem);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.1;
  margin-bottom: 1.75rem;
}

.about-prose p {
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.15rem;
  font-size: 1rem;
}

.about-prose p:last-child {
  margin-bottom: 0;
}

.about-prose a {
  color: var(--blue-light);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.about-prose a:hover {
  color: var(--text);
}

.love-card {
  margin-top: 3rem;
  padding: 1.75rem 1.5rem;
  border: 1px solid rgba(107, 140, 184, 0.22);
  border-radius: var(--radius);
  background:
    radial-gradient(ellipse 80% 60% at 0% 0%, rgba(107, 140, 184, 0.1), transparent 55%),
    rgba(13, 16, 22, 0.75);
}

.love-card h2 {
  font-size: clamp(1.25rem, 3.5vw, 1.65rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 0.85rem;
}

.love-card h2 a {
  color: var(--blue-light);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.love-card p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
}

.about-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 2.5rem;
}

.about-footer {
  padding-top: 2rem;
  padding-bottom: 2rem;
}

/* PWA / mobile app page */
.pwa-page {
  padding: calc(var(--header-offset) + 3rem) max(clamp(1.25rem, 5vw, 2rem), var(--safe-right)) calc(4rem + var(--safe-bottom)) max(clamp(1.25rem, 5vw, 2rem), var(--safe-left));
  max-width: 36rem;
  margin: 0 auto;
  text-align: center;
}

.pwa-hero h1 {
  font-size: clamp(1.85rem, 5vw, 2.75rem);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.1;
  margin-bottom: 1rem;
}

.pwa-lead {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 2rem;
  font-size: 1rem;
}

.pwa-phone-wrap {
  margin-bottom: 2rem;
}

.pwa-phone-wrap img {
  width: min(240px, 65vw);
  height: auto;
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.4));
}

.pwa-install-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(13, 16, 22, 0.75);
  margin-bottom: 1.25rem;
}

.pwa-install-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--bg-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
}

.pwa-install-icon img {
  width: 28px;
  height: 28px;
  object-fit: contain;
}

.pwa-install-card h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.pwa-install-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.5;
  margin-bottom: 0.5rem;
}

.pwa-install-card .btn[disabled] {
  opacity: 0.55;
  cursor: not-allowed;
}

.pwa-note {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.pwa-note a {
  color: var(--blue-light);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* —— Mobile nav —— */
@media (max-width: 720px) {
  .landing-depth .nav-toggle {
    display: flex;
  }

  .landing-depth .glass-nav {
    display: none;
    position: fixed;
    top: var(--header-offset);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.35rem max(1.5rem, var(--safe-right)) 1rem max(1.5rem, var(--safe-left));
    background: var(--glass-bg);
    backdrop-filter: blur(22px) saturate(1.45);
    -webkit-backdrop-filter: blur(22px) saturate(1.45);
    border-bottom: 1px solid var(--glass-border);
    z-index: 299;
  }

  .landing-depth .glass-header.nav-open .glass-nav {
    display: flex;
  }

  .landing-depth .glass-nav .nav-mode-btn,
  .landing-depth .glass-nav .nav-link {
    display: block;
    padding: 0.85rem 0;
    font-size: 0.9rem;
    border-bottom: 1px solid var(--border);
    text-align: left;
  }

  .landing-depth .glass-nav .nav-cta {
    display: block;
    margin-top: 0.75rem;
    padding: 0.75rem 1rem;
    text-align: center;
    font-size: 0.85rem;
  }

  .landing-depth .glass-header {
    padding-left: max(1.5rem, var(--safe-left));
    padding-right: max(1.5rem, var(--safe-right));
  }

  .demo-viewport {
    padding-left: max(1.5rem, var(--safe-left));
    padding-right: max(1.5rem, var(--safe-right));
  }

  .demo-topic-title {
    font-size: clamp(1.45rem, 7vw, 1.85rem);
    margin: 0.85rem 0 0.65rem;
    line-height: 1.15;
  }

  .demo-topic-prompt {
    font-size: 0.95rem;
    margin-bottom: 1.35rem;
    max-width: 28rem;
  }

  .demo-topic-meta {
    gap: 0.4rem;
    margin-bottom: 1.5rem;
  }

  /* Hide timing chips — keep category/difficulty at most */
  .demo-topic-meta .badge:nth-child(n+3) {
    display: none;
  }

  .demo-actions {
    flex-direction: column;
    align-items: stretch;
    width: min(100%, 20rem);
    margin-inline: auto;
    gap: 0.85rem;
    margin-top: 0.35rem;
  }

  .demo-actions .btn {
    width: 100%;
  }

  .demo-research-header {
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .about-page,
  .pwa-page {
    padding-left: max(1.5rem, var(--safe-left));
    padding-right: max(1.5rem, var(--safe-right));
    padding-top: calc(var(--header-offset) + 2.25rem);
  }

  .love-card {
    padding: 1.35rem 1.15rem;
  }

  .about-actions {
    flex-direction: column;
  }

  .about-actions .btn {
    width: 100%;
  }

  .landing-hero {
    padding-left: max(1.5rem, var(--safe-left));
    padding-right: max(1.5rem, var(--safe-right));
  }

  .landing-hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .landing-hero-actions .btn {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .demo-topic-meta .badge:nth-child(n+2) {
    display: none;
  }

  .pwa-install-card {
    padding: 1.25rem 1.1rem;
  }
}