/* ============================================================
   UrutiBot - single-page chat experience
   Critical above-the-fold tokens are inlined in index.html.
   This file repeats the tokens so it works standalone, then
   styles the chat card and supporting chrome.
   ============================================================ */

:root {
  --brand: #00aaa9;
  --brand-strong: #008685;
  --brand-soft: #e6f7f7;
  --on-brand: #eafafa;
  --bg: #fafbfb;
  --surface: #ffffff;
  --surface-2: #eef3f3;
  --border: #e1e7e7;
  --text: #0e1414;
  --text-muted: #4b5b5b;
  --link: #007a79;
  --link-hover: #005a59;
  --danger: #b3261e;
  --success: #1f7a3a;
  --shadow: 0 6px 24px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 24px 48px -12px rgba(0, 0, 0, 0.1);
  --shadow-card:
    0 1px 0 rgba(255, 255, 255, 0.6) inset, 0 1px 2px rgba(15, 23, 23, 0.04),
    0 12px 32px -10px rgba(15, 23, 23, 0.12),
    0 32px 64px -24px rgba(0, 170, 169, 0.14);
  --shadow-brand: 0 8px 24px -8px
    color-mix(in srgb, var(--brand) 50%, transparent);
  --radius: 22px;
  --radius-sm: 12px;
}

:root[data-theme="dark"] {
  --brand: #2dc8c7;
  --brand-strong: #5cdcdb;
  --brand-soft: #0e2828;
  --on-brand: #052828;
  --bg: #0a0e0f;
  --surface: #131819;
  --surface-2: #1c2324;
  --border: #2a3334;
  --text: #e8eded;
  --text-muted: #9aa6a6;
  --link: #5cdcdb;
  --link-hover: #8ee9e8;
  --shadow: 0 6px 24px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 24px 48px -12px rgba(0, 0, 0, 0.6);
  --shadow-card:
    0 1px 0 rgba(255, 255, 255, 0.04) inset, 0 1px 2px rgba(0, 0, 0, 0.4),
    0 16px 40px -10px rgba(0, 0, 0, 0.55),
    0 32px 64px -24px rgba(45, 200, 199, 0.18);
  --shadow-brand: 0 8px 24px -8px
    color-mix(in srgb, var(--brand) 60%, transparent);
}

/* ---------- base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

/* Honor the `hidden` attribute over our class-level `display` rules.
   Without !important, our own `.chat-error { display: flex }` etc. would
   beat the UA `[hidden] { display: none }` on equal specificity. */
[hidden] {
  display: none !important;
}
body {
  background: var(--bg);
  color: var(--text);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
    Cantarell, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh; /* fallback for browsers without dvh */
  min-height: 100dvh; /* dynamic vh: shrinks when the mobile keyboard opens
                         so the composer doesn't end up hidden under it */
  position: relative;
  isolation: isolate;
  /* Smooth color transitions when the user toggles theme - tokens cross-
     fade instead of snapping. Limited list (no `all`) so we don't slow
     down hover transitions on individual elements. */
  transition:
    background-color 0.4s ease,
    color 0.4s ease;
}
/* Soft brand-tinted aurora layered behind the page. A fixed pseudo-element
   keeps it pinned to the viewport (no scroll jitter) and a slow alternating
   transform animation gives the page a subtle "alive" feel without
   competing with content. */
body::before {
  content: "";
  position: fixed;
  inset: -10%;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(
      1200px 600px at 10% -10%,
      var(--brand-soft),
      transparent 60%
    ),
    radial-gradient(
      900px 500px at 100% 110%,
      var(--brand-soft),
      transparent 60%
    );
  animation: aurora-drift 28s ease-in-out infinite alternate;
  will-change: transform;
}
@keyframes aurora-drift {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }
  to {
    transform: translate3d(2%, -1.5%, 0) scale(1.06);
  }
}
img,
svg {
  max-width: 100%;
  height: auto;
}
button {
  font: inherit;
}

a {
  color: var(--link);
  text-decoration: none;
}
a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

:focus-visible {
  outline: 3px solid var(--brand);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--brand);
  color: var(--on-brand);
  padding: 0.5rem 1rem;
  z-index: 100;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

.muted {
  color: var(--text-muted);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- header ---------- */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: saturate(1.4) blur(6px);
  -webkit-backdrop-filter: saturate(1.4) blur(6px);
}
.brand {
  display: inline-flex;
  align-items: center;
}
.brand:hover {
  text-decoration: none;
}
.brand img {
  display: block;
  height: 28px;
  width: auto;
  transition:
    transform 0.25s cubic-bezier(0.2, 0.9, 0.3, 1.4),
    filter 0.25s ease;
}
.brand:hover img {
  transform: scale(1.04);
  filter: drop-shadow(
    0 4px 10px color-mix(in srgb, var(--brand) 35%, transparent)
  );
}

.theme-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition:
    background 0.15s,
    border-color 0.15s;
}
.theme-toggle:hover {
  background: var(--surface-2);
  border-color: color-mix(in srgb, var(--brand) 35%, var(--border));
}
.theme-toggle:hover .icon-sun,
.theme-toggle:hover .icon-moon {
  transform: rotate(20deg);
}
.theme-toggle:active {
  transform: scale(0.94);
}
.theme-toggle .icon-sun,
.theme-toggle .icon-moon,
.theme-toggle .icon-system {
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.theme-toggle .icon-sun,
.theme-toggle .icon-moon,
.theme-toggle .icon-system {
  display: none;
}
:root[data-theme-pref="light"] .theme-toggle .icon-sun {
  display: block;
}
:root[data-theme-pref="dark"] .theme-toggle .icon-moon {
  display: block;
}
:root[data-theme-pref="system"] .theme-toggle .icon-system {
  display: block;
}

/* ---------- main / stage ---------- */
.page-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.25rem;
}
.stage {
  width: 100%;
  max-width: 680px;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  animation: rise 0.45s ease-out both;
}
@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- welcome block ---------- */
.welcome {
  text-align: center;
  display: grid;
  gap: 0.5rem;
  justify-items: center;
  padding: 0 0.5rem;
}
.welcome-logo {
  margin: 0;
  margin-bottom: 2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 0;
  animation: fade-up 0.6s 0.1s ease-out both;
}
.welcome-logo img {
  display: block;
  height: clamp(32px, 5vw, 48px);
  width: auto;
  max-width: 100%;
  transition:
    transform 0.4s cubic-bezier(0.2, 0.9, 0.3, 1.4),
    filter 0.4s ease;
}
.welcome-logo img:hover {
  transform: scale(1.03) translateY(-2px);
  filter: drop-shadow(
    0 10px 24px color-mix(in srgb, var(--brand) 35%, transparent)
  );
}
@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.welcome-sub {
  margin: 0;
  color: var(--text-muted);
  font-size: 1.02rem;
  max-width: 48ch;
  line-height: 1.55;
  /* Delay so the logo lands first - reads as a deliberate cascade. */
  animation: fade-up 0.6s 0.25s ease-out both;
}

/* ---------- chat card ---------- */
.chat-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  /* Subtle hover lift - the shadow deepens and the card rises 2px so the
     surface reads as interactive, not just a static panel. */
  transition:
    transform 0.35s cubic-bezier(0.2, 0.9, 0.3, 1.2),
    box-shadow 0.35s ease;
  animation: fade-up 0.7s 0.4s ease-out both;
  display: flex;
  flex-direction: column;
  min-height: 520px;
  /* dvh keeps the card sized to the *visible* viewport on mobile, so when
     the keyboard opens the card shrinks instead of pushing the composer
     off-screen. vh fallback for older browsers. */
  max-height: min(74vh, 760px);
  max-height: min(74dvh, 760px);
  overflow: hidden;
  isolation: isolate;
  /* Keep touch / wheel scroll inside the chat - the inner .chat-log
     handles its own scroll and shouldn't chain to the page. */
  overscroll-behavior: contain;
}
.chat-card:hover {
  transform: translateY(-2px);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.6) inset,
    0 1px 2px rgba(15, 23, 23, 0.04),
    0 18px 40px -12px rgba(15, 23, 23, 0.16),
    0 40px 80px -28px color-mix(in srgb, var(--brand) 24%, transparent);
}
/* Soft brand glow underneath, anchored at top - adds depth without
   competing with content. */
.chat-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    80% 60% at 50% -10%,
    color-mix(in srgb, var(--brand) 12%, transparent),
    transparent 70%
  );
  pointer-events: none;
  z-index: 0;
}
.chat-card > * {
  position: relative;
  z-index: 1;
}

.chat-card-header {
  display: flex;
  align-items: center;
  padding: 0.9rem 1.1rem;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  gap: 0.75rem;
  min-width: 0;
  background: linear-gradient(
    180deg,
    color-mix(in srgb, var(--surface) 100%, transparent),
    color-mix(in srgb, var(--surface-2) 40%, var(--surface))
  );
}

/* CSS-rendered bot avatar: brand-gradient circle with the "U" initial. */
.bot-avatar {
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(
    135deg,
    var(--brand) 0%,
    var(--brand-strong) 100%
  );
  color: var(--on-brand);
  font-weight: 700;
  font-size: 0.98rem;
  letter-spacing: -0.02em;
  box-shadow:
    0 0 0 3px color-mix(in srgb, var(--brand) 18%, transparent),
    var(--shadow-brand);
  /* Slow breathe: barely-perceptible glow pulse signals the bot is awake.
     Distinct from the hard "online" status dot pulse. */
  animation: avatar-breathe 4.5s ease-in-out infinite;
}
@keyframes avatar-breathe {
  0%,
  100% {
    box-shadow:
      0 0 0 3px color-mix(in srgb, var(--brand) 18%, transparent),
      var(--shadow-brand);
  }
  50% {
    box-shadow:
      0 0 0 5px color-mix(in srgb, var(--brand) 22%, transparent),
      0 12px 30px -8px color-mix(in srgb, var(--brand) 60%, transparent);
  }
}

.chat-card-id {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
  min-width: 0; /* allow ellipsis on long emails */
  flex: 1;
}
.chat-card-name {
  font-weight: 650;
  color: var(--text);
  font-size: 1rem;
  letter-spacing: -0.005em;
}
.chat-card-meta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-muted);
  font-size: 0.82rem;
  min-width: 0;
  margin-top: 1px;
}
.chat-card-status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--success) 18%, transparent);
  flex: 0 0 auto;
  position: relative;
}
.chat-card-status::after {
  content: "";
  position: absolute;
  inset: -2px;
  border-radius: 50%;
  background: var(--success);
  opacity: 0.35;
  animation: pulse 2.4s ease-out infinite;
}
@keyframes pulse {
  0% {
    transform: scale(0.6);
    opacity: 0.55;
  }
  70% {
    transform: scale(2);
    opacity: 0;
  }
  100% {
    transform: scale(2);
    opacity: 0;
  }
}
.chat-card-sep {
  flex: 0 0 auto;
  opacity: 0.65;
}
.chat-card-email {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
  font-feature-settings: "tnum";
}
/* New-chat (reset) - brand-tinted pill with leading + icon.
   Visually a destructive action: tooltip + JS confirm() warn before clearing. */
.btn-new-chat {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--brand-strong);
  background: var(--brand-soft);
  border: 1px solid color-mix(in srgb, var(--brand) 28%, transparent);
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
  transition:
    background 0.18s ease,
    color 0.18s ease,
    border-color 0.18s ease,
    box-shadow 0.18s ease,
    transform 0.08s ease;
}
.btn-new-chat svg {
  display: block;
  opacity: 0.9;
  transition: transform 0.25s ease;
}
.btn-new-chat:hover {
  background: color-mix(in srgb, var(--brand) 16%, var(--surface));
  border-color: color-mix(in srgb, var(--brand) 50%, transparent);
  color: var(--brand-strong);
  box-shadow: 0 6px 16px -8px color-mix(in srgb, var(--brand) 50%, transparent);
}
.btn-new-chat:hover svg {
  transform: rotate(90deg);
}
.btn-new-chat:active {
  transform: translateY(1px);
}
:root[data-theme="dark"] .btn-new-chat {
  color: var(--brand);
}
:root[data-theme="dark"] .btn-new-chat:hover {
  color: var(--brand-strong);
}

/* ---------- pre-chat ---------- */
/* Layout the prechat form to fill the card: a centered hero on top,
   and a docked input row at the bottom that mirrors the chat composer.
   This makes the empty state read as a placeholder for the live chat. */
.chat-prechat {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  padding: 0;
  gap: 0;
}
.prechat-hero {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 0.65rem;
  padding: 2.25rem 1.5rem 1.5rem;
}

.prechat-hero-title {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 650;
  letter-spacing: -0.015em;
  color: var(--text);
}
.prechat-hero-sub {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.97rem;
  max-width: 38ch;
  line-height: 1.55;
}

.prechat-dock {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 0.9rem 1rem 1.1rem;
  border-top: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  background: linear-gradient(
    180deg,
    color-mix(in srgb, var(--surface-2) 30%, var(--surface)),
    var(--surface)
  );
}
.prechat-row {
  display: flex;
  gap: 0.6rem;
  align-items: center;
}
.prechat-row input {
  flex: 1;
  min-width: 0;
  height: 46px;
  padding: 0 1.05rem;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
  font-size: 0.96rem;
  transition:
    border-color 0.18s ease,
    box-shadow 0.18s ease,
    background 0.18s ease;
  box-shadow:
    inset 0 1px 0 color-mix(in srgb, var(--text) 4%, transparent),
    0 1px 2px rgba(0, 0, 0, 0.02);
}
.prechat-row input::placeholder {
  color: color-mix(in srgb, var(--text-muted) 75%, transparent);
}
.prechat-row input:hover:not(:focus) {
  background: color-mix(in srgb, var(--surface) 60%, var(--bg));
  border-color: color-mix(in srgb, var(--border) 60%, var(--text-muted));
}
.prechat-row input:focus {
  border-color: var(--brand);
  background: var(--surface);
  box-shadow:
    inset 0 1px 0 color-mix(in srgb, var(--text) 4%, transparent),
    0 0 0 4px var(--brand-soft);
  outline: none;
}
.prechat-row input[aria-invalid="true"] {
  border-color: var(--danger);
  box-shadow:
    inset 0 1px 0 color-mix(in srgb, var(--text) 4%, transparent),
    0 0 0 4px color-mix(in srgb, var(--danger) 14%, transparent);
}
.form-error {
  color: var(--danger);
  margin: 0;
  font-size: 0.88rem;
  font-weight: 500;
}

/* Neutralize browser autofill: WebKit/Blink paints a hard yellow (or, in
   dark mode, a milky blue) background and forces black text on autofilled
   inputs. The huge inset box-shadow paints over it with our own surface,
   and -webkit-text-fill-color restores readable foreground text. */
.prechat-row input:-webkit-autofill,
.prechat-row input:-webkit-autofill:hover,
.prechat-row input:-webkit-autofill:focus,
.chat-composer textarea:-webkit-autofill,
.chat-composer textarea:-webkit-autofill:hover,
.chat-composer textarea:-webkit-autofill:focus {
  -webkit-box-shadow:
    inset 0 1px 0 color-mix(in srgb, var(--text) 4%, transparent),
    0 0 0 1000px var(--bg) inset;
  -webkit-text-fill-color: var(--text);
  caret-color: var(--text);
  border-color: var(--border);
  transition: background-color 5000s ease-in-out 0s;
}
.prechat-row input:-webkit-autofill:focus,
.chat-composer textarea:-webkit-autofill:focus {
  -webkit-box-shadow:
    inset 0 1px 0 color-mix(in srgb, var(--text) 4%, transparent),
    0 0 0 1000px var(--surface) inset,
    0 0 0 4px var(--brand-soft);
  border-color: var(--brand);
}

/* ---------- conversation ---------- */
.chat-conversation {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}
.chat-log {
  flex: 1;
  overflow-y: auto;
  /* Stop scroll-chaining: hitting the top/bottom of the log shouldn't
     pull the body. Critical on mobile where rubber-banding the page
     behind the chat feels broken. */
  overscroll-behavior: contain;
  padding: 1.25rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.chat-log::-webkit-scrollbar {
  width: 8px;
}
.chat-log::-webkit-scrollbar-track {
  background: transparent;
}
.chat-log::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 999px;
  border: 2px solid transparent;
  background-clip: padding-box;
}
.chat-log::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
  background-clip: padding-box;
  border: 2px solid transparent;
}

.bubble {
  max-width: 86%;
  padding: 0.75rem 1rem;
  border-radius: 18px;
  line-height: 1.55;
  word-wrap: break-word;
  overflow-wrap: anywhere;
  font-size: 0.96rem;
  animation: bubble-in 0.28s ease-out both;
}
@keyframes bubble-in {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.bubble--user {
  align-self: flex-end;
  background: linear-gradient(
    135deg,
    var(--brand) 0%,
    var(--brand-strong) 100%
  );
  color: var(--on-brand);
  border-bottom-right-radius: 6px;
  box-shadow: var(--shadow-brand);
}
.bubble--user a {
  color: var(--on-brand);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.bubble--bot {
  align-self: flex-start;
  background: var(--surface-2);
  color: var(--text);
  border-bottom-left-radius: 6px;
  border: 1px solid color-mix(in srgb, var(--border) 60%, transparent);
}
.bubble--bot a {
  color: var(--link);
}
.bubble--bot a:hover {
  color: var(--link-hover);
}
.bubble p {
  margin: 0 0 0.5rem;
}
.bubble p:last-child {
  margin-bottom: 0;
}
.bubble ul,
.bubble ol {
  margin: 0.25rem 0 0.5rem 1.25rem;
  padding: 0;
}
.bubble code {
  background: color-mix(in srgb, var(--text) 8%, transparent);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
}

/* subtle "stopped" pill appended to a bot bubble after user abort */
.bubble-stopped {
  display: inline-block;
  margin-left: 0.5rem;
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--text) 10%, transparent);
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 500;
  vertical-align: 1px;
}
.bubble--bot .bubble-stopped {
  background: color-mix(in srgb, var(--text) 10%, transparent);
}
.bubble--user .bubble-stopped {
  background: color-mix(in srgb, var(--on-brand) 22%, transparent);
  color: color-mix(in srgb, var(--on-brand) 85%, transparent);
}

/* typing indicator */
.typing {
  display: inline-flex;
  gap: 4px;
  padding: 6px 2px;
  align-items: center;
}
/* When the bubble is mid-stream, the typing dots sit below the partial
   text. Empty text slot collapses to zero height so the dots show in
   place of the message until the first token lands. */
.bubble--streaming .bubble-text:not(:empty) {
  margin-bottom: 0.25rem;
}
.bubble--streaming .typing {
  display: flex;
  padding: 2px 0 0;
}
.bubble--streaming .typing span {
  opacity: 0.6;
}
.typing span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: linear-gradient(
    135deg,
    var(--brand) 0%,
    var(--brand-strong) 100%
  );
  opacity: 0.55;
  animation: typing 1.3s infinite ease-in-out;
}
.typing span:nth-child(2) {
  animation-delay: 0.18s;
}
.typing span:nth-child(3) {
  animation-delay: 0.36s;
}
@keyframes typing {
  0%,
  80%,
  100% {
    transform: translateY(0) scale(0.85);
    opacity: 0.45;
  }
  40% {
    transform: translateY(-5px) scale(1);
    opacity: 1;
  }
}

/* error block */
.chat-error {
  margin: 0 1.1rem 0.5rem;
  background: color-mix(in srgb, var(--danger) 10%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--danger) 35%, var(--border));
  color: var(--text);
  border-radius: 14px;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.chat-error p {
  margin: 0;
  flex: 1;
  font-size: 0.92rem;
}

/* composer */
.chat-composer {
  display: flex;
  gap: 0.6rem;
  align-items: flex-end;
  padding: 1rem 1.5rem;
  border-top: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  background: linear-gradient(
    180deg,
    color-mix(in srgb, var(--surface-2) 30%, var(--surface)),
    var(--surface)
  );
}
.chat-composer textarea {
  flex: 1;
  resize: none;
  min-height: 46px;
  max-height: 140px;
  padding: 0.8rem 1.05rem;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
  font-size: 0.96rem;
  line-height: 1.45;
  transition:
    border-color 0.18s ease,
    box-shadow 0.18s ease,
    background 0.18s ease;
  /* subtle inner highlight to read as a tactile, raised input */
  box-shadow:
    inset 0 1px 0 color-mix(in srgb, var(--text) 4%, transparent),
    0 1px 2px rgba(0, 0, 0, 0.02);
}
.chat-composer textarea::placeholder {
  color: color-mix(in srgb, var(--text-muted) 75%, transparent);
}
.chat-composer textarea:hover:not(:disabled):not(:focus) {
  background: color-mix(in srgb, var(--surface) 60%, var(--bg));
  border-color: color-mix(in srgb, var(--border) 60%, var(--text-muted));
}
.chat-composer textarea:focus {
  border-color: var(--brand);
  background: var(--surface);
  box-shadow:
    inset 0 1px 0 color-mix(in srgb, var(--text) 4%, transparent),
    0 0 0 4px var(--brand-soft);
  outline: none;
}
.chat-composer textarea:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  background: var(--surface-2);
  box-shadow: none;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  border: 1px solid transparent;
  border-radius: 14px;
  padding: 0.8rem 1.25rem;
  cursor: pointer;
  font-size: 0.95rem;
  transition:
    background 0.18s ease,
    color 0.18s ease,
    border-color 0.18s ease,
    box-shadow 0.18s ease,
    transform 0.08s ease,
    filter 0.18s ease;
  text-decoration: none;
  color: var(--text);
  will-change: transform;
}
.btn:active {
  transform: translateY(1px) scale(0.98);
}
.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-primary {
  background: linear-gradient(
    135deg,
    var(--brand) 0%,
    var(--brand-strong) 100%
  );
  color: var(--on-brand);
  box-shadow: var(--shadow-brand);
  border-color: color-mix(in srgb, var(--brand-strong) 65%, transparent);
  position: relative;
  overflow: hidden;
}
/* Diagonal sheen that sweeps across the button on hover. The pseudo
   sits off-screen by default and translates across when the parent is
   hovered, giving the primary CTA a tactile, premium feel. */
.btn-primary::before {
  content: "";
  position: absolute;
  top: 0;
  left: -120%;
  width: 60%;
  height: 100%;
  background: linear-gradient(
    100deg,
    transparent 0%,
    color-mix(in srgb, #ffffff 35%, transparent) 50%,
    transparent 100%
  );
  transform: skewX(-20deg);
  transition: left 0.6s ease;
  pointer-events: none;
}
.btn-primary:hover::before {
  left: 130%;
}
.btn-primary:hover {
  color: var(--on-brand);
  text-decoration: none;
  filter: brightness(1.05);
  box-shadow:
    0 12px 28px -8px color-mix(in srgb, var(--brand) 60%, transparent),
    0 2px 6px -2px color-mix(in srgb, var(--brand) 40%, transparent);
  transform: translateY(-1px);
}
.btn-primary:active {
  transform: translateY(0) scale(0.99);
  filter: brightness(1);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover {
  background: var(--surface-2);
  border-color: color-mix(in srgb, var(--border) 60%, var(--text-muted));
}

.btn-danger {
  background: var(--danger);
  color: #fff;
  box-shadow: 0 8px 20px -8px color-mix(in srgb, var(--danger) 50%, transparent);
}
.btn-danger:hover {
  filter: brightness(1.06);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 0.5rem 0.9rem;
  font-size: 0.88rem;
  border-radius: 12px;
}

/* Circular icon CTAs (Send / Stop) - premium, balances the textarea pill. */
.btn-icon {
  width: 46px;
  height: 46px;
  padding: 0;
  border-radius: 50%;
  flex: 0 0 auto;
}
.btn-icon svg {
  transition: transform 0.18s ease;
}
.btn-icon:hover svg {
  transform: scale(1.08);
}
.btn-icon.btn-primary svg {
  transform: translate(-1px, 1px);
}
.btn-icon.btn-primary:hover svg {
  transform: translate(-1px, 1px) scale(1.08);
}

/* ---------- footer ---------- */
.page-footer {
  padding: 0.85rem 1.25rem;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
}
.page-footer a {
  color: var(--text-muted);
}
.page-footer a:hover {
  color: var(--text);
}

/* ---------- responsive ---------- */
@media (max-width: 640px) {
  .page-header {
    padding: 0.75rem 1rem;
  }
  .page-main {
    padding: 1rem 0.75rem;
  }
  .chat-card {
    /* Allow the card to shrink below 460px when the keyboard is open
       and the dvh-based viewport is tiny - otherwise the card would
       overflow and push the composer off-screen. */
    min-height: min(460px, calc(100dvh - 220px));
    /* 230px accounts for: header (~60) + footer (~50) + main padding
       (32) + welcome block (~70) + gap (24). Tuned so a 600px-tall
       viewport just barely fits without forcing body scroll. */
    max-height: calc(100vh - 230px); /* fallback */
    max-height: calc(100dvh - 230px);
    border-radius: 18px;
  }
  /* iOS zooms in on any input/textarea whose font-size is below 16px when
     focused. Bump these to 16px on small screens so the page doesn't
     suddenly scale up the moment the user taps the field. */
  .prechat-row input,
  .chat-composer textarea {
    font-size: 16px;
  }
  .chat-card-header {
    padding: 0.8rem 0.9rem;
  }
  .bot-avatar {
    width: 34px;
    height: 34px;
    font-size: 0.92rem;
  }
  .chat-log {
    padding: 1rem 0.85rem;
  }
  /* Bottom padding respects the iPhone home-indicator inset so the
     send/start button doesn't end up behind it on notched devices. */
  .chat-composer {
    padding: 0.75rem 0.85rem max(0.85rem, env(safe-area-inset-bottom));
  }
  .prechat-dock {
    padding: 0.75rem 0.85rem max(0.85rem, env(safe-area-inset-bottom));
  }
  .prechat-hero {
    padding: 1.75rem 1.25rem 1rem;
  }
  .welcome-sub {
    font-size: 0.95rem;
  }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
  html {
    scroll-behavior: auto;
  }
  .stage {
    animation: none;
  }
}