:root {
  --ink: #0e1a24;
  --ink-soft: #2a3d4d;
  --paper: #f3f7f4;
  --foam: #e6f2ec;
  --mint: #1f8a70;
  --mint-deep: #146554;
  --coffee: #c47a3a;
  --coffee-deep: #9a5a28;
  --line: rgba(14, 26, 36, 0.12);
  --glow: rgba(31, 138, 112, 0.35);
  --danger-soft: #b54a3c;
  --font-display: "Fraunces", "Georgia", serif;
  --font-body: "Figtree", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "Consolas", monospace;
  --radius: 14px;
  --shadow: 0 18px 50px rgba(14, 26, 36, 0.14);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(31, 138, 112, 0.22), transparent 55%),
    radial-gradient(900px 500px at 95% 5%, rgba(196, 122, 58, 0.18), transparent 50%),
    linear-gradient(165deg, #d9ebe3 0%, var(--paper) 42%, #eef3f0 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(14, 26, 36, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14, 26, 36, 0.03) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(to bottom, black, transparent 70%);
}

a {
  color: var(--mint-deep);
}

.shell {
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.25rem 0 3rem;
}

.hero {
  min-height: min(92vh, 720px);
  display: grid;
  align-content: center;
  gap: 1.1rem;
  padding: 2.5rem 0 3rem;
  position: relative;
  animation: rise 700ms ease-out both;
}

.hero::after {
  content: "";
  position: absolute;
  right: -4%;
  top: 12%;
  width: min(42vw, 380px);
  height: min(42vw, 380px);
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 35%, rgba(255, 255, 255, 0.55), transparent 45%),
    radial-gradient(circle at 60% 60%, rgba(196, 122, 58, 0.35), transparent 60%),
    radial-gradient(circle at 50% 50%, rgba(31, 138, 112, 0.4), transparent 70%);
  filter: blur(2px);
  animation: drift 10s ease-in-out infinite alternate;
  z-index: 0;
}

.hero > * {
  position: relative;
  z-index: 1;
}

.brand {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(3.2rem, 9vw, 5.6rem);
  letter-spacing: -0.03em;
  line-height: 0.95;
  color: var(--ink);
}

.brand span {
  color: var(--mint-deep);
}

.tagline {
  margin: 0;
  max-width: 34rem;
  font-size: clamp(1.05rem, 2.4vw, 1.25rem);
  color: var(--ink-soft);
  line-height: 1.45;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.4rem;
}

.button {
  appearance: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
  font-weight: 650;
  font-size: 0.98rem;
  border-radius: 999px;
  padding: 0.85rem 1.35rem;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  background: var(--ink);
  color: #f7fbf8;
  box-shadow: 0 10px 24px rgba(14, 26, 36, 0.22);
}

.button-primary:hover {
  background: #173041;
}

.button-ghost {
  background: rgba(255, 255, 255, 0.55);
  color: var(--ink);
  border: 1px solid var(--line);
}

.panel {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 4px);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  padding: 1.15rem;
  animation: rise 800ms ease-out 120ms both;
}

.panel-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  align-items: end;
  margin-bottom: 0.9rem;
}

.panel-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.55rem;
  letter-spacing: -0.02em;
}

.panel-head p {
  margin: 0.2rem 0 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.layout {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 1rem;
}

@media (max-width: 880px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .hero::after {
    opacity: 0.55;
    width: 240px;
    height: 240px;
  }
}

label {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 0.35rem;
}

textarea,
input,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  padding: 0.75rem 0.85rem;
}

textarea {
  min-height: 220px;
  resize: vertical;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.45;
}

textarea:focus,
input:focus {
  outline: 2px solid rgba(31, 138, 112, 0.35);
  border-color: var(--mint);
}

.stack {
  display: grid;
  gap: 0.75rem;
}

details.flavor {
  border-top: 1px dashed var(--line);
  padding-top: 0.75rem;
}

details.flavor summary {
  cursor: pointer;
  font-weight: 650;
  color: var(--mint-deep);
}

.chat {
  display: grid;
  grid-template-rows: 1fr auto;
  min-height: 420px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background:
    linear-gradient(180deg, rgba(230, 242, 236, 0.65), rgba(255, 255, 255, 0.9));
  overflow: hidden;
}

.messages {
  padding: 1rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.bubble {
  max-width: 92%;
  padding: 0.7rem 0.85rem;
  border-radius: 14px;
  line-height: 1.45;
  font-size: 0.95rem;
  white-space: pre-wrap;
  animation: pop 220ms ease-out;
}

.bubble strong {
  font-weight: 700;
}

.bubble.bot {
  align-self: flex-start;
  background: #fff;
  border: 1px solid var(--line);
}

.bubble.user {
  align-self: flex-end;
  background: var(--ink);
  color: #f4faf7;
}

.bubble.meta {
  align-self: center;
  background: transparent;
  color: var(--ink-soft);
  font-size: 0.85rem;
  border: none;
  padding: 0.2rem;
}

.composer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem;
  padding: 0.75rem;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.85);
}

.composer input {
  border-radius: 999px;
}

.composer .button {
  padding-inline: 1.1rem;
}

.token-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem;
  align-items: end;
}

.hint {
  margin: 0.35rem 0 0;
  font-size: 0.8rem;
  color: var(--ink-soft);
}

.status {
  min-height: 1.2rem;
  font-size: 0.82rem;
  color: var(--coffee-deep);
}

.status.error {
  color: var(--danger-soft);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.55rem;
}

.chip {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.7);
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  font-size: 0.8rem;
  cursor: pointer;
  font-family: var(--font-body);
}

.chip:hover {
  border-color: var(--mint);
  color: var(--mint-deep);
}

.footer-note {
  margin-top: 1rem;
  color: var(--ink-soft);
  font-size: 0.85rem;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pop {
  from {
    opacity: 0;
    transform: translateY(6px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes drift {
  from {
    transform: translate(0, 0) scale(1);
  }
  to {
    transform: translate(-18px, 12px) scale(1.05);
  }
}