:root {
  --bg: #f7f5f2;
  --bg-elevated: #ffffff;
  --panel: rgba(255, 255, 255, 0.92);
  --ink: #1a1a1a;
  --ink-soft: #5c5c5c;
  --muted: #8a8a8a;
  --line: rgba(26, 26, 26, 0.1);
  --orange: #e87722;
  --orange-hot: #f3860b;
  --orange-deep: #c45f12;
  --assistant: #f4f1ee;
  --user: linear-gradient(145deg, #e87722, #c45f12);
  --shadow: 0 20px 50px rgba(26, 26, 26, 0.1);
  --radius: 22px;
  --font: "Plus Jakarta Sans", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(900px 520px at 12% -8%, rgba(232, 119, 34, 0.16) 0%, transparent 55%),
    radial-gradient(800px 480px at 100% 0%, rgba(243, 134, 11, 0.1) 0%, transparent 50%),
    linear-gradient(165deg, #fffaf6 0%, var(--bg) 45%, #f3efe9 100%);
}

.atmosphere {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(26, 26, 26, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26, 26, 26, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at center, black 35%, transparent 85%);
  opacity: 0.5;
}

.shell {
  width: min(920px, calc(100% - 2rem));
  height: 100dvh;
  margin: 0 auto;
  padding: 1rem 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 0.85rem;
  position: relative;
  z-index: 1;
}

.brand-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-shrink: 0;
  animation: rise 500ms ease-out both;
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 0.95rem;
  min-width: 0;
}

.brand-logo {
  height: 42px;
  width: auto;
  display: block;
  filter: drop-shadow(0 6px 16px rgba(232, 119, 34, 0.18));
}

.eyebrow {
  margin: 0 0 0.2rem;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--orange);
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: clamp(1.55rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--ink);
}

.chat-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(14px);
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  min-height: 0;
  height: 100%;
  overflow: hidden;
  animation: rise 650ms ease-out both;
  position: relative;
}

.chat-panel::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--orange), transparent);
  opacity: 0.9;
  z-index: 2;
  pointer-events: none;
}

.messages-stage {
  position: relative;
  min-height: 0;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.messages {
  flex: 1 1 auto;
  min-height: 0;
  height: 100%;
  padding: 1.25rem 1.25rem 1rem;
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  scroll-behavior: smooth;
  display: flex;
  flex-direction: column;
  gap: 0.95rem;
  -webkit-overflow-scrolling: touch;
}

.messages::-webkit-scrollbar {
  width: 10px;
}

.messages::-webkit-scrollbar-thumb {
  background: rgba(232, 119, 34, 0.35);
  border-radius: 999px;
  border: 2px solid transparent;
  background-clip: padding-box;
}

.jump-latest {
  position: absolute;
  left: 50%;
  bottom: 0.85rem;
  transform: translateX(-50%);
  z-index: 3;
  border: 1px solid rgba(232, 119, 34, 0.35);
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-size: 0.85rem;
  font-weight: 700;
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  box-shadow: 0 10px 24px rgba(26, 26, 26, 0.12);
  cursor: pointer;
}

.jump-latest:hover {
  border-color: var(--orange);
  color: var(--orange-deep);
}

.bubble {
  max-width: min(82%, 660px);
  padding: 0.95rem 1.05rem;
  border-radius: 18px;
  line-height: 1.55;
  flex-shrink: 0;
  animation: pop 220ms ease-out both;
}

.bubble.assistant {
  align-self: flex-start;
  background: var(--assistant);
  border: 1px solid var(--line);
  color: var(--ink);
}

.bubble.user {
  align-self: flex-end;
  background: var(--user);
  color: #fff;
  white-space: pre-wrap;
  box-shadow: 0 10px 28px rgba(232, 119, 34, 0.22);
}

.bubble.system {
  align-self: center;
  max-width: 92%;
  text-align: center;
  background: rgba(255, 255, 255, 0.65);
  color: var(--ink-soft);
  font-size: 0.95rem;
  border: 1px dashed rgba(232, 119, 34, 0.4);
}

.bubble.assistant .md > *:first-child {
  margin-top: 0;
}

.bubble.assistant .md > *:last-child {
  margin-bottom: 0;
}

.bubble.assistant .md p {
  margin: 0 0 0.7rem;
}

.bubble.assistant .md h1,
.bubble.assistant .md h2,
.bubble.assistant .md h3 {
  margin: 0.2rem 0 0.55rem;
  font-size: 1rem;
  font-weight: 760;
  color: #111;
}

.bubble.assistant .md strong {
  color: #111;
  font-weight: 700;
}

.bubble.assistant .md ul,
.bubble.assistant .md ol {
  margin: 0 0 0.75rem;
  padding-left: 1.15rem;
}

.bubble.assistant .md li {
  margin: 0.28rem 0;
}

.bubble.assistant .md li::marker {
  color: var(--orange);
}

.bubble.assistant .md a {
  color: var(--orange-deep);
}

.composer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.75rem;
  padding: 0.9rem 1.1rem 1.05rem;
  border-top: 1px solid var(--line);
  background: rgba(255, 252, 249, 0.96);
  flex-shrink: 0;
}

textarea {
  width: 100%;
  resize: none;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 0.9rem 1rem;
  font: inherit;
  color: var(--ink);
  background: #fff;
  outline: none;
  min-height: 64px;
  max-height: 160px;
}

textarea::placeholder {
  color: var(--muted);
}

textarea:focus {
  border-color: rgba(232, 119, 34, 0.65);
  box-shadow: 0 0 0 4px rgba(232, 119, 34, 0.12);
}

.send-btn,
.ghost-btn {
  font: inherit;
  font-weight: 700;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease, opacity 160ms ease, border-color 160ms ease;
}

.send-btn {
  align-self: end;
  border: 0;
  background: linear-gradient(145deg, var(--orange-hot), var(--orange-deep));
  color: #fff;
  padding: 0.85rem 1.3rem;
  min-width: 92px;
  box-shadow: 0 10px 24px rgba(232, 119, 34, 0.25);
}

.send-btn:hover:not(:disabled),
.ghost-btn:hover {
  transform: translateY(-1px);
}

.send-btn:disabled {
  opacity: 0.55;
  cursor: wait;
}

.ghost-btn {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.8);
  color: var(--ink-soft);
  padding: 0.55rem 0.95rem;
}

.ghost-btn:hover {
  border-color: rgba(232, 119, 34, 0.5);
  color: var(--ink);
}

.typing {
  display: inline-flex;
  gap: 0.28rem;
  align-items: center;
  min-height: 1.2rem;
}

.typing span {
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 50%;
  background: var(--orange);
  animation: blink 1s infinite ease-in-out;
}

.typing span:nth-child(2) {
  animation-delay: 0.15s;
}

.typing span:nth-child(3) {
  animation-delay: 0.3s;
}

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

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  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 blink {
  0%,
  80%,
  100% {
    opacity: 0.25;
    transform: translateY(0);
  }
  40% {
    opacity: 1;
    transform: translateY(-2px);
  }
}

@media (max-width: 640px) {
  .shell {
    width: min(100% - 1rem, 920px);
    padding: 0.75rem 0;
  }

  .brand-bar {
    align-items: start;
    flex-direction: column;
  }

  .brand-logo {
    height: 34px;
  }

  .bubble {
    max-width: 94%;
  }

  .composer {
    grid-template-columns: 1fr;
  }

  .send-btn {
    width: 100%;
  }
}