:root {
  --ink: #12161c;
  --ink-soft: #3a4452;
  --paper: #f3f6f9;
  --panel: rgba(255, 255, 255, 0.72);
  --panel-solid: #ffffff;
  --line: rgba(18, 22, 28, 0.1);
  --signal: #e85d04;
  --signal-deep: #c44a00;
  --sky-a: #d7e4f2;
  --sky-b: #eef3f7;
  --sky-c: #f7f1e8;
  --user-bubble: #12161c;
  --agent-bubble: #ffffff;
  --shadow: 0 18px 50px rgba(18, 22, 28, 0.12);
  --radius: 22px;
  --font-display: "Anybody", sans-serif;
  --font-body: "Sora", sans-serif;
}

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

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  overflow-x: hidden;
}

.sky {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(1200px 700px at 12% -10%, #c9daf0 0%, transparent 55%),
    radial-gradient(900px 600px at 90% 0%, #f3d9b8 0%, transparent 50%),
    linear-gradient(160deg, var(--sky-a), var(--sky-b) 45%, var(--sky-c));
  z-index: -2;
}

.grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(18, 22, 28, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(18, 22, 28, 0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at 50% 20%, black, transparent 75%);
  z-index: -1;
  animation: drift 28s linear infinite;
}

@keyframes drift {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(48px);
  }
}

.lang-switch {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 20;
  display: inline-flex;
  padding: 4px;
  gap: 2px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--line);
  box-shadow: 0 10px 28px rgba(18, 22, 28, 0.1);
  backdrop-filter: blur(10px);
}

.lang-switch__btn {
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 0.45rem 0.7rem;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.lang-switch__btn:hover {
  color: var(--ink);
}

.lang-switch__btn.is-active {
  background: var(--ink);
  color: #fff;
}

.shell {
  width: min(920px, calc(100% - 2rem));
  margin: 0 auto;
  min-height: 100vh;
  padding: 2.5rem 0 1.5rem;
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 1.5rem;
}
.brand {
  animation: rise 0.7s ease both;
}

.brand__row {
  display: flex;
  align-items: center;
  gap: 1.15rem 1.35rem;
}

.brand__photo {
  width: clamp(88px, 18vw, 120px);
  height: clamp(88px, 18vw, 120px);
  object-fit: cover;
  object-position: center 18%;
  border-radius: 28px;
  border: 1px solid var(--line);
  box-shadow: 0 14px 34px rgba(18, 22, 28, 0.14);
  flex-shrink: 0;
  background: #dfe6ee;
  animation: rise 0.85s ease both;
}

.brand__text {
  min-width: 0;
}

.brand__mark {
  margin: 0 0 0.55rem;
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.brand__title {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.45rem 0.55rem;
  line-height: 0.95;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.1rem, 6.5vw, 3.8rem);
  letter-spacing: -0.03em;
}

.brand__code {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.1rem, 6.5vw, 3.8rem);
  letter-spacing: -0.04em;
  color: var(--signal);
  animation: pulse-code 3.2s ease-in-out infinite;
}

.brand__line {
  margin: 0.85rem 0 0;
  max-width: 34rem;
  color: var(--ink-soft);
  font-size: 1rem;
  line-height: 1.5;
}

.status {
  margin-top: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.86rem;
  color: var(--ink-soft);
}

.status__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #9aa3ad;
  box-shadow: 0 0 0 0 rgba(232, 93, 4, 0.35);
}

.status.is-live .status__dot {
  background: #1f8a4c;
  animation: live 1.8s ease-in-out infinite;
}

.status.is-stub .status__dot {
  background: var(--signal);
}

@keyframes live {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(31, 138, 76, 0.35);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(31, 138, 76, 0);
  }
}

@keyframes pulse-code {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.72;
  }
}

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

.stage {
  display: grid;
  grid-template-rows: 1fr auto;
  min-height: min(68vh, 720px);
  background: var(--panel);
  backdrop-filter: blur(14px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  animation: rise 0.85s ease both;
  animation-delay: 0.08s;
}

.transcript {
  padding: 1.35rem 1.2rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.msg {
  max-width: min(78%, 560px);
  padding: 0.9rem 1rem;
  border-radius: 18px;
  line-height: 1.55;
  font-size: 0.95rem;
  white-space: pre-wrap;
  word-break: break-word;
  animation: rise 0.35s ease both;
}

.msg--agent {
  align-self: flex-start;
  background: var(--agent-bubble);
  border: 1px solid var(--line);
  color: var(--ink);
  border-bottom-left-radius: 6px;
}

.msg--user {
  align-self: flex-end;
  background: var(--user-bubble);
  color: #fff;
  border-bottom-right-radius: 6px;
}

.msg__who {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.55;
}

.msg--typing {
  color: var(--ink-soft);
}

.composer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.75rem;
  padding: 0.95rem;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.55);
}

.composer textarea {
  width: 100%;
  resize: none;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.9rem 1rem;
  font: inherit;
  font-size: 0.95rem;
  line-height: 1.4;
  background: var(--panel-solid);
  color: var(--ink);
  outline: none;
  max-height: 160px;
}

.composer textarea:focus {
  border-color: rgba(232, 93, 4, 0.55);
  box-shadow: 0 0 0 3px rgba(232, 93, 4, 0.12);
}

.composer button {
  border: 0;
  border-radius: 14px;
  padding: 0 1.15rem;
  background: var(--signal);
  color: #fff;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease;
}

.composer button:hover {
  background: var(--signal-deep);
}

.composer button:active {
  transform: translateY(1px);
}

.composer button:disabled {
  opacity: 0.55;
  cursor: wait;
}

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

@media (max-width: 640px) {
  .shell {
    width: calc(100% - 1rem);
    padding-top: 1.4rem;
  }

  .brand__row {
    align-items: flex-start;
  }

  .brand__photo {
    border-radius: 22px;
  }

  .msg {
    max-width: 92%;
  }

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

  .composer button {
    min-height: 48px;
  }
}