:root {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #f6f7fb;
  background: #10131a;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top right, rgba(255,255,255,.09), transparent 30rem),
    linear-gradient(160deg, #151922 0%, #0d1016 100%);
  transition: background .35s ease;
}

body[data-mode="work"] {
  background:
    radial-gradient(circle at top right, rgba(106, 214, 255, .17), transparent 28rem),
    linear-gradient(160deg, #14202a 0%, #0e1318 100%);
}

body[data-mode="normal"] {
  background:
    radial-gradient(circle at top right, rgba(191, 129, 255, .16), transparent 28rem),
    linear-gradient(160deg, #1d1726 0%, #111016 100%);
}

body[data-mode="sleep"] {
  background:
    radial-gradient(circle at top right, rgba(91, 107, 190, .15), transparent 28rem),
    linear-gradient(160deg, #111625 0%, #090c13 100%);
}

button, a { -webkit-tap-highlight-color: transparent; }

button {
  font: inherit;
  color: inherit;
}

.app-shell {
  width: min(100%, 760px);
  margin: 0 auto;
  padding:
    max(28px, env(safe-area-inset-top))
    max(18px, env(safe-area-inset-right))
    max(52px, calc(28px + env(safe-area-inset-bottom)))
    max(18px, env(safe-area-inset-left));
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
}

.eyebrow {
  margin: 0 0 6px;
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .18em;
  opacity: .55;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 8vw, 3.8rem);
  line-height: 1;
  letter-spacing: -.04em;
}

.subtitle {
  margin: 10px 0 0;
  color: rgba(246,247,251,.68);
  max-width: 34rem;
}

.ghost-button,
.mode-switcher button,
.card-action {
  border: 1px solid rgba(255,255,255,.11);
  background: rgba(255,255,255,.055);
  border-radius: 999px;
  cursor: pointer;
}

.ghost-button {
  padding: 9px 12px;
  white-space: nowrap;
}

.mode-switcher {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 22px 0 12px;
  scrollbar-width: none;
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(18px);
}

.mode-switcher::-webkit-scrollbar { display: none; }

.mode-switcher button {
  padding: 10px 14px;
  white-space: nowrap;
}

.mode-switcher button.active {
  background: rgba(255,255,255,.16);
  border-color: rgba(255,255,255,.28);
}

.context-strip {
  display: flex;
  gap: 10px;
  align-items: center;
  color: rgba(246,247,251,.55);
  font-size: .84rem;
  margin: 4px 0 16px;
}

.context-strip span + span::before {
  content: "·";
  margin-right: 10px;
}

.feed {
  display: grid;
  gap: 14px;
}

.feed-card {
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.10);
  border-radius: 26px;
  background: rgba(255,255,255,.065);
  box-shadow: 0 18px 54px rgba(0,0,0,.20);
  backdrop-filter: blur(18px);
}

.card-body { padding: 21px; }

.card-source {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: rgba(246,247,251,.50);
  font-size: .78rem;
}

.card-title {
  margin: 18px 0 10px;
  font-size: clamp(1.35rem, 5.5vw, 2.15rem);
  line-height: 1.08;
  letter-spacing: -.025em;
}

.card-summary,
.text-content {
  color: rgba(246,247,251,.75);
  line-height: 1.62;
  margin: 0;
  white-space: pre-wrap;
}

.text-content {
  font-size: 1.08rem;
  margin-top: 15px;
}

.media-frame {
  width: 100%;
  max-height: 620px;
  display: block;
  object-fit: cover;
  background: rgba(0,0,0,.24);
}

video.media-frame {
  max-height: 70vh;
  background: #000;
}

.tags {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.tag {
  border: 1px solid rgba(255,255,255,.09);
  border-radius: 999px;
  padding: 6px 9px;
  color: rgba(246,247,251,.57);
  font-size: .74rem;
}

.card-actions {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 18px;
}

.card-action {
  padding: 8px 11px;
  font-size: .82rem;
}

.card-action.primary {
  background: rgba(255,255,255,.92);
  color: #11151c;
  border-color: transparent;
  text-decoration: none;
  font-weight: 650;
}

.card-action.subtle {
  opacity: .72;
}

.translation-note {
  display: none;
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: 14px;
  background: rgba(255,255,255,.055);
  color: rgba(246,247,251,.66);
  font-size: .82rem;
  line-height: 1.45;
}

.translation-note.visible { display: block; }

.feed-sentinel {
  min-height: 72px;
  display: grid;
  place-items: center;
  text-align: center;
  color: rgba(246,247,251,.42);
  font-size: .8rem;
  padding: 16px 0;
}

.footer-note {
  color: rgba(246,247,251,.32);
  font-size: .76rem;
  text-align: center;
  margin: 24px 0 0;
}

.loading {
  min-height: 40vh;
  display: grid;
  place-items: center;
  color: rgba(246,247,251,.5);
}

@media (max-width: 430px) {
  .app-shell {
    padding:
      max(20px, env(safe-area-inset-top))
      max(12px, env(safe-area-inset-right))
      max(42px, calc(22px + env(safe-area-inset-bottom)))
      max(12px, env(safe-area-inset-left));
  }
  .card-body { padding: 18px; }
  .feed { gap: 10px; }
}


.card-action:disabled {
  opacity: .5;
  cursor: wait;
}

.media-fallback {
  display: grid;
  min-height: 180px;
  place-items: center;
  padding: 24px;
  text-align: center;
  color: rgba(246,247,251,.55);
  background:
    linear-gradient(135deg, rgba(255,255,255,.045), rgba(255,255,255,.015));
  border-bottom: 1px solid rgba(255,255,255,.07);
}


.card-action.link-fallback {
  background: rgba(255, 196, 87, .12);
  border-color: rgba(255, 196, 87, .25);
  color: rgba(255, 231, 184, .95);
}

.card-action.link-dead {
  opacity: .48;
  cursor: not-allowed;
  text-decoration: line-through;
}


.feed-card.type-exercise {
  border-color: rgba(173, 216, 255, .18);
  background:
    linear-gradient(145deg, rgba(91, 139, 255, .10), rgba(255,255,255,.055));
}

.feed-card.type-exercise .card-source span:first-child::before {
  content: "🧾 ";
}

.exercise-answer {
  margin-top: 16px;
  padding: 14px 15px;
  border-radius: 16px;
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.09);
  color: rgba(246,247,251,.84);
  line-height: 1.55;
  white-space: pre-wrap;
}

.exercise-answer[hidden] {
  display: none;
}

.card-action.tax-action {
  background: rgba(130, 177, 255, .15);
  border-color: rgba(130, 177, 255, .28);
}


.speech-lab {
  margin-top: 16px;
  padding: 14px;
  border-radius: 18px;
  border: 1px solid rgba(130, 177, 255, .18);
  background: rgba(15, 23, 42, .26);
}

.speech-lab-title {
  font-size: .78rem;
  color: rgba(210, 226, 255, .7);
  margin-bottom: 10px;
}

.speech-controls {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.speech-result {
  margin-top: 12px;
  padding: 12px;
  border-radius: 14px;
  background: rgba(255,255,255,.055);
  color: rgba(246,247,251,.78);
  line-height: 1.5;
  font-size: .86rem;
}

.speech-result[hidden] {
  display: none;
}

.speech-score {
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -.02em;
}

.speech-score span {
  font-size: .76rem;
  font-weight: 500;
  opacity: .6;
}

.speech-transcript,
.speech-feedback,
.speech-disclaimer {
  margin-top: 7px;
}

.speech-disclaimer {
  opacity: .48;
  font-size: .72rem;
}