:root {
  --cream: #fffde8;
  --ink: #191a17;
  --muted: #74766d;
  --line: #dfddc5;
  --lavender: #edcffd;
  --orange: #ffa43b;
  --green: #00594d;
  --green-bright: #00a982;
  --card-radius: 34px;
  --serif: Georgia, "Times New Roman", Times, serif;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  font-family: var(--sans);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  background:
    radial-gradient(circle at 12% 8%, rgba(237, 207, 253, 0.38), transparent 18rem),
    radial-gradient(circle at 86% 2%, rgba(255, 164, 59, 0.16), transparent 18rem),
    var(--cream);
  color: var(--ink);
  margin: 0;
  min-height: 100vh;
}

body::before,
body::after {
  color: rgba(25, 26, 23, 0.055);
  font-family: var(--serif);
  font-size: clamp(5.5rem, 13vw, 16rem);
  line-height: 0.8;
  pointer-events: none;
  position: fixed;
  z-index: -1;
}

body::before {
  content: "Signal";
  left: -3vw;
  top: 18vh;
  transform: rotate(-11deg);
}

body::after {
  bottom: 4vh;
  content: "Fifteen";
  right: -5vw;
  transform: rotate(7deg);
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

.topbar {
  align-items: center;
  background: rgba(255, 253, 232, 0.88);
  border: 3px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 10px 0 rgba(25, 26, 23, 0.05);
  display: grid;
  gap: 28px;
  grid-template-columns: auto 1fr auto;
  margin: 22px auto 0;
  max-width: 1460px;
  padding: 14px 18px 14px 24px;
  position: relative;
  width: calc(100% - 48px);
  z-index: 20;
}

.brand-lockup {
  align-items: center;
  display: flex;
  gap: 12px;
}

.brand-mark {
  align-items: end;
  display: inline-flex;
  gap: 3px;
  height: 34px;
  justify-content: center;
  width: 34px;
}

.brand-mark i {
  background: var(--ink);
  border-radius: 999px;
  display: block;
  width: 5px;
}

.brand-mark i:nth-child(1) { height: 20px; }
.brand-mark i:nth-child(2) { height: 29px; }
.brand-mark i:nth-child(3) { height: 15px; }
.brand-mark i:nth-child(4) { height: 25px; }

.eyebrow {
  color: var(--green);
  font-size: 0.72rem;
  font-weight: 950;
  letter-spacing: 0.14em;
  margin: 0 0 8px;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(1.45rem, 2.2vw, 2.05rem);
  letter-spacing: -0.03em;
  line-height: 1;
  margin: 0;
}

.topnav {
  align-items: center;
  border-left: 2px solid var(--line);
  border-right: 2px solid var(--line);
  display: flex;
  gap: clamp(18px, 4vw, 56px);
  justify-content: center;
  min-height: 58px;
}

.topnav a,
.classic-link {
  font-size: 1rem;
  font-weight: 850;
}

.classic-link {
  background: var(--lavender);
  border: 3px solid var(--ink);
  border-radius: 16px;
  box-shadow: 0 3px 0 var(--ink);
  padding: 13px 18px;
}

.shell {
  margin: 0 auto 56px;
  max-width: 1500px;
  padding: clamp(24px, 3.6vw, 52px) clamp(20px, 4vw, 70px) 0;
}

.hero-panel {
  align-items: center;
  background: rgba(255, 253, 232, 0.76);
  border: 3px solid var(--line);
  border-radius: 28px;
  display: grid;
  gap: clamp(28px, 5vw, 72px);
  grid-template-columns: minmax(0, 1fr) minmax(320px, 460px);
  margin-bottom: 28px;
  padding: clamp(26px, 4vw, 54px);
}

.hero-copy h2 {
  font-family: var(--serif);
  font-size: clamp(3rem, 5.7vw, 6rem);
  font-weight: 500;
  letter-spacing: -0.065em;
  line-height: 0.94;
  margin: 0 0 22px;
  max-width: 920px;
}

.hero-copy p:not(.eyebrow) {
  color: var(--muted);
  font-size: clamp(1.05rem, 1.5vw, 1.34rem);
  font-weight: 800;
  line-height: 1.28;
  max-width: 760px;
}

.source-pills,
.source-list,
.prompt-row {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.source-pills span,
.source-list span,
.prompt-row button {
  border: 3px solid var(--ink);
  border-radius: 999px;
  display: inline-flex;
  font-weight: 950;
  min-height: 38px;
  padding: 7px 16px;
}

.source-pills span:nth-child(1),
.source-list span:nth-child(1) {
  background: var(--ink);
  color: var(--cream);
}

.source-pills span:nth-child(2),
.source-list span:nth-child(2) {
  background: var(--lavender);
}

.source-pills span:nth-child(3),
.source-list span:nth-child(3) {
  background: var(--orange);
}

.source-pills span:nth-child(4),
.source-list span:nth-child(4) {
  background: var(--cream);
}

.source-pills span:nth-child(5),
.source-list span:nth-child(5) {
  background: var(--green);
  color: var(--cream);
}

.context-card,
.ask-card,
.signal-card {
  border: 4px solid var(--ink);
  border-radius: var(--card-radius);
}

.context-card {
  background: var(--lavender);
  display: grid;
  gap: 16px;
  padding: clamp(24px, 3vw, 36px);
}

.context-card label {
  display: grid;
  font-weight: 950;
  gap: 8px;
}

.context-card input,
.chat-form input {
  background: var(--cream);
  border: 3px solid var(--ink);
  border-radius: 18px;
  color: var(--ink);
  font-weight: 850;
  outline: 0;
  padding: 14px 18px;
  width: 100%;
}

.context-card button,
.chat-form button {
  background: var(--ink);
  border: 3px solid var(--ink);
  border-radius: 18px;
  color: var(--cream);
  font-weight: 950;
  padding: 15px 18px;
}

.context-card p {
  color: rgba(25, 26, 23, 0.62);
  font-weight: 850;
  line-height: 1.34;
  margin: 2px 0 0;
}

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

.signal-card,
.ask-card {
  background: rgba(255, 253, 232, 0.9);
  padding: clamp(22px, 3vw, 36px);
}

.signal-card.primary {
  grid-column: span 3;
}

.signal-card.lavender {
  background: var(--lavender);
}

.signal-card.dark {
  background:
    radial-gradient(circle at 74% 12%, rgba(255, 253, 232, 0.12), transparent 10rem),
    var(--ink);
  color: var(--cream);
}

.signal-card.dark .eyebrow,
.signal-card.dark .why-box span {
  color: var(--lavender);
}

.signal-card h2,
.ask-card h2 {
  font-family: var(--serif);
  font-size: clamp(2.3rem, 4vw, 4.7rem);
  font-weight: 500;
  letter-spacing: -0.06em;
  line-height: 0.94;
  margin-bottom: 18px;
}

.signal-card p,
.ask-card p,
.chat-log {
  color: var(--muted);
  font-size: 1rem;
  font-weight: 780;
  line-height: 1.45;
}

.signal-card.dark p,
.signal-card.dark .observed-list li {
  color: rgba(255, 253, 232, 0.78);
}

.why-box {
  background: rgba(25, 26, 23, 0.06);
  border-radius: 20px;
  margin: 20px 0;
  padding: 18px;
}

.dark-box {
  background: rgba(255, 253, 232, 0.08);
}

.why-box span,
.split-grid span,
.why-split span,
.message strong {
  display: block;
  font-size: 0.78rem;
  font-weight: 950;
  letter-spacing: 0.09em;
  margin-bottom: 7px;
  text-transform: uppercase;
}

.why-box p,
.tight-copy {
  margin-bottom: 0;
}

.split-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr 1fr;
  margin-bottom: 18px;
}

.split-grid div,
.why-split div {
  background: rgba(255, 253, 232, 0.46);
  border: 2px solid rgba(25, 26, 23, 0.18);
  border-radius: 20px;
  padding: 16px;
}

.why-split {
  display: grid;
  gap: 14px;
}

.why-split p {
  margin-bottom: 0;
}

.observed-list {
  display: grid;
  gap: 12px;
  margin-bottom: 18px;
}

.observed-list div {
  border-left: 5px solid var(--orange);
  padding-left: 14px;
}

.observed-list strong {
  color: var(--cream);
  display: block;
  margin-bottom: 4px;
}

.ask-card {
  grid-column: span 3;
}

.watch-card {
  background: rgba(255, 253, 232, 0.92);
  border: 4px solid var(--ink);
  border-radius: var(--card-radius);
  grid-column: span 3;
  padding: clamp(22px, 3vw, 36px);
}

.watch-header {
  align-items: end;
  display: flex;
  justify-content: space-between;
  margin-bottom: 18px;
}

.watch-header h2 {
  font-family: var(--serif);
  font-size: clamp(2.2rem, 4vw, 4.5rem);
  font-weight: 500;
  letter-spacing: -0.06em;
  line-height: 0.94;
  margin-bottom: 0;
}

.watch-list {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.watch-item {
  background: var(--ink);
  border-radius: 26px;
  color: var(--cream);
  display: grid;
  gap: 14px;
  min-height: 220px;
  padding: 22px;
}

.watch-item h3 {
  font-family: var(--serif);
  font-size: clamp(1.7rem, 2.4vw, 2.7rem);
  font-weight: 500;
  letter-spacing: -0.045em;
  line-height: 0.98;
  margin: 0 0 12px;
}

.watch-item p {
  color: rgba(255, 253, 232, 0.78);
  font-weight: 800;
  line-height: 1.35;
  margin: 0;
}

.watch-item details {
  align-self: end;
  border-top: 1px solid rgba(255, 253, 232, 0.2);
  padding-top: 12px;
}

.watch-item summary {
  color: var(--lavender);
  cursor: pointer;
  font-weight: 950;
}

.watch-item details span {
  color: var(--orange);
  display: block;
  font-size: 0.88rem;
  font-weight: 900;
  margin-top: 10px;
}

.ask-copy {
  max-width: 820px;
}

.chat-log {
  display: grid;
  gap: 12px;
  margin: 20px 0;
}

.message {
  background: rgba(25, 26, 23, 0.06);
  border-radius: 22px;
  max-width: 980px;
  padding: 16px 18px;
}

.message.user {
  background: var(--lavender);
  color: var(--ink);
  justify-self: end;
  max-width: 760px;
}

.message p {
  margin: 0 0 10px;
}

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

.chat-form {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr auto;
}

.prompt-row {
  margin-top: 14px;
}

.prompt-row button {
  background: var(--cream);
  color: var(--ink);
}

@media (max-width: 980px) {
  .topbar,
  .hero-panel,
  .brief-grid,
  .split-grid,
  .watch-list,
  .chat-form {
    grid-template-columns: 1fr;
  }

  .topnav {
    display: none;
  }

  .signal-card.primary,
  .watch-card,
  .ask-card {
    grid-column: span 1;
  }
}

@media (max-width: 640px) {
  .topbar {
    margin-top: 14px;
    width: calc(100% - 24px);
  }

  .shell {
    padding: 22px 14px 0;
  }

  .hero-copy h2,
  .signal-card h2,
  .ask-card h2 {
    font-size: clamp(2.4rem, 12vw, 4rem);
  }
}