:root {
  --bg: #0b0907;
  --bg-deep: #120d09;
  --peat: #18110c;
  --moss: #272117;
  --membrane: rgba(26, 18, 13, 0.94);
  --plate: rgba(31, 22, 16, 0.9);
  --plate-soft: rgba(40, 28, 19, 0.78);
  --plate-inset: rgba(18, 12, 9, 0.9);
  --line: rgba(141, 108, 71, 0.38);
  --line-soft: rgba(111, 83, 52, 0.22);
  --line-strong: rgba(195, 148, 93, 0.55);
  --text: #f4ead7;
  --text-soft: #e4d6bd;
  --muted: #cdb18a;
  --muted-strong: #ddc39f;
  --ember: #da9c48;
  --ember-soft: rgba(218, 156, 72, 0.18);
  --signal: #f1bb74;
  --signal-dim: #7f5224;
  --shadow: 0 32px 80px rgba(0, 0, 0, 0.48);
  --radius: 26px;
  --radius-sm: 18px;
  --max-width: 1240px;
  --font-body: Georgia, "Times New Roman", serif;
  --font-reading: Georgia, "Iowan Old Style", "Palatino Linotype", "Book Antiqua", serif;
  --font-ui: "Trebuchet MS", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at top center, rgba(216, 157, 76, 0.12), transparent 24%),
    radial-gradient(circle at 20% 12%, rgba(82, 58, 34, 0.25), transparent 26%),
    radial-gradient(circle at 80% 18%, rgba(62, 45, 27, 0.18), transparent 24%),
    linear-gradient(180deg, #090705 0%, #0d0907 34%, #110d0a 100%);
  font-family: var(--font-body);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button,
textarea {
  font: inherit;
}

img {
  display: block;
  max-width: 100%;
}

.ambient,
.root-vein {
  position: fixed;
  pointer-events: none;
  z-index: 0;
}

.ambient {
  filter: blur(28px);
  opacity: 0.52;
}

.ambient-1 {
  top: 10vh;
  left: -5rem;
  width: 16rem;
  height: 16rem;
  border-radius: 50%;
  background: rgba(150, 88, 25, 0.16);
}

.ambient-2 {
  right: -3rem;
  bottom: 8vh;
  width: 19rem;
  height: 19rem;
  border-radius: 50%;
  background: rgba(91, 62, 29, 0.18);
}

.root-vein {
  inset: auto auto 0 auto;
  width: 28vw;
  height: 54vh;
  opacity: 0.12;
  filter: none;
}

.root-vein-left {
  left: 0;
  background:
    radial-gradient(circle at 6% 84%, rgba(228, 186, 132, 0.32), transparent 8%),
    linear-gradient(35deg, transparent 0 46%, rgba(132, 95, 61, 0.85) 47%, transparent 48%),
    linear-gradient(58deg, transparent 0 58%, rgba(132, 95, 61, 0.5) 59%, transparent 60%),
    linear-gradient(82deg, transparent 0 70%, rgba(132, 95, 61, 0.45) 71%, transparent 72%);
}

.root-vein-right {
  right: 0;
  background:
    radial-gradient(circle at 94% 76%, rgba(228, 186, 132, 0.28), transparent 8%),
    linear-gradient(-32deg, transparent 0 46%, rgba(132, 95, 61, 0.8) 47%, transparent 48%),
    linear-gradient(-54deg, transparent 0 58%, rgba(132, 95, 61, 0.48) 59%, transparent 60%),
    linear-gradient(-78deg, transparent 0 70%, rgba(132, 95, 61, 0.42) 71%, transparent 72%);
}

.app-shell {
  position: relative;
  z-index: 1;
  width: min(100%, var(--max-width));
  margin: 0 auto;
  padding: 1rem 1rem 2rem;
}

.plate,
.plate-inset,
.toc-panel-inner {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow:
    inset 0 1px 0 rgba(255, 228, 198, 0.04),
    inset 0 -1px 0 rgba(0, 0, 0, 0.22),
    var(--shadow);
}

.plate::before,
.plate-inset::before,
.toc-panel-inner::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at top center, rgba(231, 177, 113, 0.05), transparent 18%),
    linear-gradient(180deg, rgba(255, 224, 188, 0.03), transparent 10%, transparent 88%, rgba(0, 0, 0, 0.22)),
    repeating-linear-gradient(
      180deg,
      transparent 0 13px,
      rgba(255, 255, 255, 0.009) 13px 14px
    );
}

.plate::after,
.plate-inset::after,
.toc-panel-inner::after {
  content: "";
  position: absolute;
  inset: 1px;
  border-radius: inherit;
  pointer-events: none;
  box-shadow:
    inset 0 0 0 1px rgba(255, 226, 191, 0.025),
    inset 0 -18px 26px rgba(0, 0, 0, 0.24),
    inset 0 18px 22px rgba(255, 225, 184, 0.015);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
  padding: 0.85rem 0;
}

.topbar-title {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  text-align: center;
}

.eyebrow,
.panel-label {
  margin: 0;
  font-family: var(--font-ui);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--muted-strong);
}

.ghost-button,
.primary-button {
  appearance: none;
  position: relative;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  padding: 0.86rem 1.2rem;
  font-family: var(--font-ui);
  font-size: 0.92rem;
  letter-spacing: 0.02em;
  font-weight: 600;
  cursor: pointer;
  transition: transform 140ms ease, box-shadow 140ms ease, border-color 140ms ease, background 140ms ease;
}

.ghost-button::before,
.primary-button::before {
  content: "";
  position: absolute;
  inset: 1px;
  border-radius: inherit;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(255, 216, 168, 0.08), rgba(0, 0, 0, 0.18));
}

.ghost-button {
  color: var(--text);
  background: linear-gradient(180deg, rgba(60, 42, 27, 0.86), rgba(22, 15, 11, 0.96));
  box-shadow:
    inset 0 1px 0 rgba(255, 214, 166, 0.08),
    inset 0 -10px 16px rgba(0, 0, 0, 0.18),
    0 10px 18px rgba(0, 0, 0, 0.26);
}

.primary-button {
  color: #180f08;
  background:
    radial-gradient(circle at 50% 35%, rgba(255, 220, 160, 0.92), transparent 38%),
    linear-gradient(180deg, #f0bf78 0%, #cf8d39 100%);
  box-shadow:
    inset 0 1px 0 rgba(255, 240, 212, 0.34),
    inset 0 -10px 14px rgba(137, 81, 20, 0.16),
    0 0 0 1px rgba(210, 143, 59, 0.2),
    0 12px 24px rgba(0, 0, 0, 0.3);
}

.ghost-button:hover,
.primary-button:hover {
  transform: translateY(-1px);
  box-shadow:
    inset 0 1px 0 rgba(255, 214, 166, 0.12),
    0 14px 24px rgba(0, 0, 0, 0.34);
}

.ghost-button:hover,
.primary-button:hover,
.ghost-button:focus-visible,
.primary-button:focus-visible {
  border-color: rgba(226, 171, 97, 0.76);
}

.ghost-button:active,
.primary-button:active,
.ghost-button.is-triggered,
.primary-button.is-triggered {
  transform: translateY(1px);
  box-shadow:
    inset 0 2px 0 rgba(0, 0, 0, 0.26),
    inset 0 -1px 0 rgba(255, 222, 176, 0.06),
    0 4px 10px rgba(0, 0, 0, 0.24);
}

.ghost-button:focus-visible,
.primary-button:focus-visible,
.toc-button:focus-visible,
textarea:focus-visible {
  outline: 1px solid rgba(238, 182, 104, 0.72);
  outline-offset: 2px;
}

.viewport {
  position: relative;
}

.hero-screen,
.reader-screen,
.error-screen {
  animation: rise 360ms ease;
}

.hero-grid {
  display: grid;
  gap: 1rem;
}

.hero-copy,
.hero-panel,
.reader-card,
.toc-panel-inner,
.disclaimer,
.error-screen .reader-card,
.reader-footer {
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(44, 31, 21, 0.94), rgba(17, 13, 10, 0.98)),
    var(--membrane);
}

.hero-copy {
  padding: 1.5rem;
  min-height: 22rem;
  display: grid;
  align-content: space-between;
  gap: 1rem;
}

.hero-copy h1,
.reader-head h1,
.error-screen h1 {
  margin: 0;
  font-weight: 500;
  line-height: 0.98;
  letter-spacing: -0.035em;
  color: #f5ead4;
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.26);
}

.hero-copy h1 {
  font-size: clamp(3rem, 13vw, 5.6rem);
  max-width: 9ch;
  text-wrap: balance;
}

.hero-lead {
  max-width: 32rem;
  font-size: 1.08rem;
  line-height: 1.8;
  color: var(--text-soft);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.hero-artifact-shell {
  min-height: 24rem;
  display: grid;
  align-items: stretch;
}

.artifact-frame {
  position: relative;
  isolation: isolate;
  min-height: 100%;
  border-radius: 34px;
  background:
    radial-gradient(circle at 50% 48%, rgba(220, 159, 76, 0.12), transparent 24%),
    radial-gradient(circle at 50% 12%, rgba(114, 80, 43, 0.22), transparent 28%),
    linear-gradient(180deg, rgba(27, 18, 12, 0.98), rgba(12, 9, 7, 0.98));
  border: 1px solid rgba(146, 106, 65, 0.42);
  box-shadow:
    inset 0 0 0 1px rgba(255, 226, 190, 0.03),
    inset 0 -30px 40px rgba(0, 0, 0, 0.22),
    0 28px 64px rgba(0, 0, 0, 0.48);
  overflow: hidden;
}

.artifact-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 50% 48%, rgba(239, 187, 108, 0.2), transparent 12%),
    linear-gradient(180deg, rgba(255, 217, 163, 0.03), transparent 24%, rgba(0, 0, 0, 0.3));
  pointer-events: none;
  z-index: 4;
}

.artifact-image {
  position: absolute;
  inset: 6% 4%;
  width: 92%;
  height: 88%;
  object-fit: contain;
  filter: saturate(0.92) brightness(0.92) contrast(1.06);
  z-index: 2;
}

.artifact-halo {
  position: absolute;
  inset: 24% 24%;
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(240, 188, 99, 0.32) 0%, rgba(240, 188, 99, 0.06) 42%, transparent 72%);
  filter: blur(24px);
  z-index: 1;
}

.artifact-vignette {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at center, transparent 42%, rgba(8, 6, 5, 0.2) 60%, rgba(5, 4, 3, 0.62) 100%),
    linear-gradient(180deg, rgba(0, 0, 0, 0.24), transparent 20%, transparent 80%, rgba(0, 0, 0, 0.32));
  z-index: 3;
}

.artifact-root {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 34%;
  z-index: 0;
  opacity: 0.24;
}

.artifact-root-left {
  left: -4%;
  background:
    linear-gradient(55deg, transparent 0 54%, rgba(141, 102, 64, 0.9) 55%, transparent 56%),
    linear-gradient(78deg, transparent 0 62%, rgba(121, 87, 55, 0.55) 63%, transparent 64%),
    linear-gradient(32deg, transparent 0 72%, rgba(121, 87, 55, 0.48) 73%, transparent 74%);
}

.artifact-root-right {
  right: -4%;
  background:
    linear-gradient(-56deg, transparent 0 54%, rgba(141, 102, 64, 0.9) 55%, transparent 56%),
    linear-gradient(-80deg, transparent 0 62%, rgba(121, 87, 55, 0.55) 63%, transparent 64%),
    linear-gradient(-30deg, transparent 0 72%, rgba(121, 87, 55, 0.48) 73%, transparent 74%);
}

.hero-panel {
  padding: 1.25rem;
}

.route-list {
  display: grid;
  gap: 0.75rem;
  margin-top: 1rem;
}

.route-item {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-soft);
  background:
    linear-gradient(180deg, rgba(57, 39, 24, 0.72), rgba(17, 12, 9, 0.88));
}

.route-item strong {
  font-weight: 500;
  color: #f1dfc4;
}

.route-item span {
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: 0.86rem;
}

.toc-panel {
  position: fixed;
  inset: 4.8rem 1rem auto 1rem;
  z-index: 40;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-0.5rem);
  transition: opacity 160ms ease, transform 160ms ease;
}

.toc-panel.is-open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.toc-panel-inner {
  max-height: min(76vh, 48rem);
  overflow: auto;
  border-radius: var(--radius);
  padding: 1.1rem;
  background:
    linear-gradient(180deg, rgba(38, 27, 19, 0.97), rgba(15, 11, 8, 0.98));
}

.toc-list {
  display: grid;
  gap: 1rem;
}

.toc-group {
  display: grid;
  gap: 0.5rem;
}

.toc-group h3 {
  margin: 0;
  font-size: 1rem;
  font-family: var(--font-ui);
  color: #efddbf;
}

.toc-button {
  width: 100%;
  text-align: left;
  border: 1px solid var(--line-soft);
  border-radius: 14px;
  background:
    linear-gradient(180deg, rgba(54, 38, 24, 0.72), rgba(19, 13, 9, 0.9));
  color: var(--text);
  padding: 0.75rem 0.9rem;
  cursor: pointer;
  font-family: var(--font-ui);
  line-height: 1.35;
}

.toc-button.is-active {
  border-color: var(--line-strong);
  box-shadow:
    inset 0 0 0 1px rgba(230, 175, 107, 0.12),
    inset 0 0 18px rgba(214, 151, 77, 0.06);
}

.toc-button:hover,
.toc-button:focus-visible {
  border-color: rgba(217, 160, 88, 0.62);
  box-shadow:
    inset 0 0 0 1px rgba(230, 175, 107, 0.08),
    inset 0 0 14px rgba(214, 151, 77, 0.05);
}

.toc-button:active,
.toc-button.is-triggered {
  transform: translateY(1px);
  box-shadow:
    inset 0 2px 0 rgba(0, 0, 0, 0.24),
    inset 0 0 0 1px rgba(230, 175, 107, 0.09);
}

.toc-button.is-complete::after {
  content: "Luettu";
  float: right;
  color: var(--ember);
  font-family: var(--font-ui);
  font-size: 0.8rem;
}

.reader-screen {
  position: relative;
}

.reader-screen::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.06;
  background:
    radial-gradient(circle at center, rgba(233, 180, 102, 0.08), transparent 18%),
    url("assets/images/hermosto-orbi.png") center 10rem / min(92vw, 56rem) auto no-repeat;
  filter: saturate(0.76) contrast(1.06);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0.95) 16%, rgba(0, 0, 0, 0.95) 84%, rgba(0, 0, 0, 0.25));
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0.95) 16%, rgba(0, 0, 0, 0.95) 84%, rgba(0, 0, 0, 0.25));
}

.reader-layout {
  display: grid;
  gap: 1rem;
}

.reader-head {
  display: grid;
  gap: 1rem;
}

.reader-head h1 {
  font-size: clamp(2.1rem, 6vw, 3.9rem);
  max-width: 12ch;
}

.progress-cluster {
  display: grid;
  gap: 0.55rem;
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-ui);
  color: var(--muted-strong);
  font-size: 0.88rem;
  letter-spacing: 0.03em;
}

.progress-track {
  position: relative;
  height: 22px;
  border-radius: 999px;
  border: 1px solid var(--line-soft);
  background:
    linear-gradient(180deg, rgba(12, 9, 7, 0.92), rgba(30, 20, 13, 0.82));
  overflow: hidden;
  box-shadow:
    inset 0 1px 0 rgba(255, 222, 180, 0.03),
    inset 0 -10px 12px rgba(0, 0, 0, 0.24);
}

.progress-track::before {
  content: "";
  position: absolute;
  inset: 50% 0 auto;
  height: 1px;
  background: rgba(191, 139, 78, 0.42);
  transform: translateY(-50%);
}

.progress-track::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 0.6rem;
  width: 0.38rem;
  height: 0.38rem;
  border-radius: 50%;
  transform: translateY(-50%);
  background: rgba(245, 191, 116, 0.88);
  box-shadow: 0 0 8px rgba(245, 191, 116, 0.22);
}

.progress-bar {
  position: absolute;
  inset: 50% auto auto 0;
  width: 0;
  height: 5px;
  border-radius: 999px;
  transform: translateY(-50%);
  background:
    linear-gradient(90deg, rgba(119, 76, 31, 0.92), rgba(241, 187, 116, 0.96));
  box-shadow:
    0 0 0 1px rgba(224, 169, 96, 0.1),
    0 0 10px rgba(224, 169, 96, 0.12);
  transition: width 200ms ease;
}

.reader-card {
  padding: 1.45rem 1.15rem 1.6rem;
  transition:
    transform 180ms ease,
    opacity 180ms ease,
    border-color 180ms ease,
    box-shadow 180ms ease;
  background:
    radial-gradient(circle at top center, rgba(212, 152, 77, 0.035), transparent 18%),
    linear-gradient(180deg, rgba(34, 24, 18, 0.975), rgba(15, 11, 9, 0.985));
  box-shadow:
    inset 0 1px 0 rgba(255, 229, 194, 0.035),
    inset 0 0 0 1px rgba(113, 81, 49, 0.14),
    inset 0 -28px 36px rgba(0, 0, 0, 0.12),
    0 24px 72px rgba(0, 0, 0, 0.5);
  transform-origin: 50% 8%;
  will-change: transform, opacity, box-shadow;
}

.reader-card.page-is-turning {
  transform: translateY(2px) rotateX(0.42deg);
  opacity: 0.94;
  border-color: rgba(186, 137, 78, 0.46);
  box-shadow:
    inset 0 1px 0 rgba(255, 229, 194, 0.03),
    inset 0 0 0 1px rgba(113, 81, 49, 0.12),
    inset 0 -22px 28px rgba(0, 0, 0, 0.1),
    0 18px 52px rgba(0, 0, 0, 0.42);
}

.reader-card.page-is-turning::after,
.reader-card.page-has-turned::after {
  box-shadow:
    inset 0 0 0 1px rgba(255, 226, 191, 0.02),
    inset -14px 0 18px rgba(214, 151, 77, 0.035),
    inset 0 18px 22px rgba(255, 225, 184, 0.012);
}

.reader-card.page-has-turned {
  transform: translateY(0);
  opacity: 1;
  border-color: rgba(171, 125, 72, 0.34);
}

.reader-orb-glow {
  position: absolute;
  inset: 1rem auto auto 50%;
  width: min(48vw, 20rem);
  height: min(48vw, 20rem);
  border-radius: 50%;
  transform: translateX(-50%);
  pointer-events: none;
  background: radial-gradient(circle, rgba(223, 161, 83, 0.09), transparent 68%);
  filter: blur(26px);
}

.video-slot,
.observation-card,
.summary-card {
  padding: 1rem;
  border-radius: 20px;
  background:
    linear-gradient(180deg, rgba(30, 21, 15, 0.96), rgba(13, 10, 8, 0.94));
}

.plate-inset {
  border: 1px solid rgba(113, 81, 49, 0.42);
}

.video-slot {
  display: grid;
  gap: 0.55rem;
  margin-bottom: 1rem;
  padding: 0.85rem;
  background:
    radial-gradient(circle at top center, rgba(216, 156, 80, 0.06), transparent 34%),
    linear-gradient(180deg, rgba(22, 16, 12, 0.96), rgba(9, 8, 7, 0.97));
  border-color: rgba(126, 90, 54, 0.5);
  box-shadow:
    inset 0 1px 0 rgba(255, 225, 188, 0.025),
    inset 0 0 0 1px rgba(95, 68, 42, 0.18),
    0 16px 34px rgba(0, 0, 0, 0.3);
}

.video-slot::before {
  background:
    radial-gradient(circle at top center, rgba(231, 177, 113, 0.04), transparent 16%),
    linear-gradient(180deg, rgba(255, 224, 188, 0.02), transparent 10%, transparent 88%, rgba(0, 0, 0, 0.18)),
    repeating-linear-gradient(
      180deg,
      transparent 0 15px,
      rgba(255, 255, 255, 0.006) 15px 16px
    );
}

.video-slot .panel-label,
.video-slot strong,
.video-slot span {
  position: relative;
  z-index: 2;
}

.video-slot strong {
  font-size: 1.1rem;
  font-weight: 500;
  color: #f0dfc2;
}

.video-slot span {
  color: var(--text-soft);
  line-height: 1.5;
  max-width: 34rem;
}

.video-slot.is-loading strong,
.video-slot.is-loading span {
  opacity: 0.78;
}

.threshold-sound-toggle {
  appearance: none;
  position: relative;
  z-index: 2;
  justify-self: center;
  margin-top: 0.1rem;
  border: 1px solid rgba(141, 103, 63, 0.44);
  border-radius: 999px;
  padding: 0.45rem 0.8rem;
  min-width: 8.75rem;
  color: rgba(236, 205, 157, 0.92);
  background:
    linear-gradient(180deg, rgba(45, 31, 21, 0.86), rgba(16, 12, 9, 0.94));
  box-shadow:
    inset 0 1px 0 rgba(255, 226, 191, 0.045),
    inset 0 -10px 14px rgba(0, 0, 0, 0.16),
    0 8px 18px rgba(0, 0, 0, 0.22);
  font-family: var(--font-ui);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  cursor: pointer;
  transition: transform 140ms ease, border-color 140ms ease, box-shadow 140ms ease, color 140ms ease;
}

.threshold-sound-toggle::before {
  content: "";
  display: inline-block;
  width: 0.42rem;
  height: 0.42rem;
  margin-right: 0.5rem;
  vertical-align: middle;
  border-radius: 50%;
  background: rgba(119, 83, 46, 0.72);
  box-shadow: 0 0 0 1px rgba(255, 225, 188, 0.05);
}

.threshold-sound-toggle[aria-pressed="true"] {
  border-color: rgba(188, 138, 81, 0.62);
  color: #f1d7ad;
  box-shadow:
    inset 0 1px 0 rgba(255, 226, 191, 0.06),
    inset 0 0 18px rgba(212, 152, 77, 0.06),
    0 10px 20px rgba(0, 0, 0, 0.24);
}

.threshold-sound-toggle[aria-pressed="true"]::before {
  background: rgba(222, 164, 89, 0.92);
  box-shadow: 0 0 12px rgba(222, 164, 89, 0.24);
}

.threshold-sound-toggle:hover,
.threshold-sound-toggle:focus-visible {
  border-color: rgba(207, 151, 88, 0.68);
  transform: translateY(-1px);
}

.threshold-sound-toggle:active {
  transform: translateY(1px);
}

.threshold-sound-toggle:focus-visible {
  outline: 1px solid rgba(238, 182, 104, 0.72);
  outline-offset: 2px;
}

.threshold-video {
  position: relative;
  z-index: 1;
  display: block;
  width: min(100%, 620px);
  aspect-ratio: 16 / 9;
  margin-inline: auto;
  margin-top: 0.2rem;
  border-radius: 18px;
  border: 1px solid rgba(144, 104, 62, 0.42);
  padding: 0.3rem;
  object-fit: cover;
  background:
    radial-gradient(circle at 50% 20%, rgba(108, 75, 44, 0.16), transparent 44%),
    linear-gradient(180deg, rgba(17, 13, 10, 0.88), rgba(6, 5, 4, 0.98));
  filter: saturate(0.76) brightness(0.74) contrast(1.08);
  box-shadow:
    inset 0 0 0 1px rgba(255, 228, 191, 0.03),
    0 0 0 1px rgba(52, 37, 24, 0.4),
    0 20px 34px rgba(0, 0, 0, 0.34);
  pointer-events: none;
}

.video-slot[data-video-state="ready"] .panel-label::after {
  content: "";
  display: inline-block;
  width: 0.42rem;
  height: 0.42rem;
  margin-left: 0.55rem;
  vertical-align: middle;
  border-radius: 50%;
  background: rgba(222, 164, 89, 0.92);
  box-shadow: 0 0 12px rgba(222, 164, 89, 0.28);
}

.video-slot[data-video-state="ready"]::after {
  content: "";
  position: absolute;
  inset: auto 10% 0.85rem 10%;
  height: 1px;
  border-radius: 999px;
  background: linear-gradient(90deg, transparent, rgba(218, 156, 72, 0.24), transparent);
  pointer-events: none;
}

@supports not (aspect-ratio: 16 / 9) {
  .threshold-video {
    height: min(56vw, 22rem);
  }
}

.prose {
  position: relative;
  font-family: var(--font-reading);
  font-size: clamp(1.12rem, 1.05rem + 0.35vw, 1.34rem);
  line-height: 2.05;
  letter-spacing: 0.018em;
  color: #efe3cf;
  text-shadow: none;
  max-width: 62ch;
  margin-inline: auto;
  padding: 1.15rem 0.3rem 0.4rem;
}

.reader-body.prose::before {
  content: "";
  display: block;
  width: min(100%, 18rem);
  height: 1px;
  margin: 0 0 1.75rem;
  background:
    linear-gradient(90deg, rgba(215, 155, 82, 0.58), rgba(215, 155, 82, 0.08) 72%, transparent 100%);
  box-shadow: 0 0 14px rgba(215, 155, 82, 0.08);
}

.reader-body.prose::after {
  content: "";
  position: absolute;
  top: 1.1rem;
  left: 0.3rem;
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 50%;
  background: rgba(223, 164, 91, 0.82);
  box-shadow: 0 0 10px rgba(223, 164, 91, 0.12);
}

.prose h4,
.prose h5,
.prose h6 {
  margin: 2.35rem 0 1rem;
  font-family: var(--font-reading);
  font-weight: 400;
  line-height: 1.42;
  letter-spacing: 0.03em;
  color: #f0d8b3;
  text-wrap: balance;
}

.prose p,
.prose ul,
.prose blockquote,
.prose aside,
.prose hr {
  margin: 0;
}

.prose p {
  margin-bottom: 1.42rem;
  color: #efe2cd;
}

.prose ul {
  list-style: none;
  padding-left: 0;
  display: grid;
  gap: 0.9rem;
  margin-bottom: 1.55rem;
}

.prose p,
.prose li {
  max-width: 62ch;
}

.prose li {
  position: relative;
  padding-left: 1.4rem;
  color: #ebddc5;
  line-height: 1.95;
}

.prose li::before {
  content: "";
  position: absolute;
  top: 1.02em;
  left: 0.1rem;
  width: 0.36rem;
  height: 0.36rem;
  border-radius: 50%;
  transform: translateY(-50%);
  background:
    radial-gradient(circle, rgba(247, 199, 129, 0.95) 0%, rgba(208, 143, 67, 0.92) 60%, rgba(122, 77, 28, 0.96) 100%);
  box-shadow: 0 0 10px rgba(214, 151, 77, 0.08);
}

.prose blockquote {
  margin: 0.4rem 0 1.75rem;
  padding: 0.3rem 0 0.3rem 1.45rem;
  border-left: 1px solid rgba(214, 151, 77, 0.58);
  color: #e4d4b8;
  font-style: italic;
  letter-spacing: 0.016em;
}

.prose hr {
  border: 0;
  height: 1px;
  margin: 1.8rem 0 2rem;
  background: linear-gradient(90deg, transparent, rgba(171, 122, 69, 0.52), transparent);
}

.prose aside {
  display: grid;
  gap: 0.9rem;
  padding: 1.25rem 1.2rem 1.15rem;
  margin: 1.7rem 0 1.95rem;
  border-radius: 18px;
  border: 1px solid rgba(115, 83, 50, 0.28);
  background:
    radial-gradient(circle at top left, rgba(222, 163, 86, 0.04), transparent 18%),
    linear-gradient(180deg, rgba(36, 25, 18, 0.82), rgba(15, 11, 8, 0.94));
  box-shadow:
    inset 0 1px 0 rgba(255, 230, 195, 0.02),
    inset 0 0 0 1px rgba(96, 68, 43, 0.1);
}

.prose aside p:last-child,
.prose aside ul:last-child,
.prose aside blockquote:last-child {
  margin-bottom: 0;
}

.observation-card,
.summary-card {
  margin-top: 1.25rem;
}

.observation-header {
  margin-bottom: 0.75rem;
}

.observation-header h2 {
  margin: 0.15rem 0 0;
  font-size: 1.35rem;
  font-weight: 500;
  color: #f0dfc2;
}

textarea {
  width: 100%;
  min-height: 8rem;
  border: 1px solid rgba(134, 95, 56, 0.42);
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(11, 9, 7, 0.96), rgba(27, 19, 13, 0.92));
  color: var(--text);
  padding: 0.9rem 1rem;
  resize: vertical;
  line-height: 1.7;
}

textarea:focus {
  outline: 1px solid rgba(223, 162, 85, 0.44);
  box-shadow: 0 0 0 3px rgba(223, 162, 85, 0.12);
}

.observation-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-top: 0.9rem;
}

#save-feedback {
  color: var(--muted-strong);
  font-family: var(--font-ui);
  font-size: 0.88rem;
}

.summary-list {
  display: grid;
  gap: 0.8rem;
}

.summary-item {
  padding: 0.9rem 1rem;
  border-radius: 16px;
  border: 1px solid rgba(120, 87, 51, 0.34);
  background:
    linear-gradient(180deg, rgba(52, 36, 24, 0.6), rgba(15, 11, 8, 0.84));
}

.summary-item h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-family: var(--font-ui);
  color: #eedab8;
}

.summary-item p {
  margin: 0;
  color: var(--text-soft);
}

.summary-empty {
  color: var(--muted-strong);
}

.reader-footer {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  padding: 0.9rem;
  position: sticky;
  bottom: 1rem;
}

.reader-footer.is-final-close {
  grid-template-columns: repeat(2, 1fr);
}

.disclaimer {
  margin-top: 1rem;
  padding: 1rem 1.1rem;
  color: #e0cfb1;
  line-height: 1.72;
  font-size: 0.98rem;
}

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

.hidden {
  display: none !important;
}

@media (min-width: 900px) {
  .app-shell {
    padding: 1.25rem 1.25rem 3rem;
  }

  .hero-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(20rem, 0.96fr) minmax(18rem, 0.7fr);
    align-items: stretch;
  }

  .reader-head {
    grid-template-columns: minmax(0, 1.2fr) minmax(14rem, 0.8fr);
    align-items: end;
  }

  .reader-card {
    padding: 1.8rem 1.7rem 1.9rem;
  }

  .prose {
    padding-inline: 0.65rem;
  }

  .reader-footer {
    grid-template-columns: repeat(3, 1fr);
  }

  .reader-footer.is-final-close {
    grid-template-columns: repeat(2, 1fr);
  }

  .toc-panel {
    left: auto;
    right: max(1rem, calc((100vw - var(--max-width)) / 2 + 1rem));
    width: min(30rem, calc(100vw - 2rem));
  }
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero-screen,
  .reader-screen,
  .error-screen,
  .reader-card,
  .ghost-button,
  .primary-button,
  .toc-button {
    animation: none !important;
    transition-duration: 0.01ms !important;
  }

  .reader-card {
    transform: none !important;
    opacity: 1 !important;
  }
}