:root {
  /* AI-specific tokens extend the portfolio tokens defined in ../styles.css. */
  --twin-panel: rgba(12, 16, 36, 0.94);
  --twin-panel-strong: #0c1024;
  --twin-panel-soft: rgba(255, 255, 255, 0.045);
  --twin-border: rgba(255, 255, 255, 0.12);
  --twin-border-active: rgba(255, 255, 255, 0.24);
  --twin-text: #f7f8ff;
  --twin-muted: #a8afc5;
  --twin-muted-dark: #7f879e;
  --twin-danger: #ff9a9a;
  --twin-radius-lg: 30px;
  --twin-radius-md: 20px;
  --twin-radius-sm: 14px;
  --twin-transition: 180ms ease;
}

* { box-sizing: border-box; }

.twin-body {
  min-height: 100vh;
  min-height: 100dvh;
  background:
    radial-gradient(circle at 76% 8%, var(--accent-soft), transparent 25rem),
    var(--bg);
}

.twin-ambient {
  position: fixed;
  z-index: -1;
  top: 18%;
  left: -16rem;
  width: 36rem;
  height: 36rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(53, 214, 255, 0.06), transparent 68%);
  pointer-events: none;
}

.twin-site-header .desktop-nav a.active {
  color: white;
}

.twin-site-header .desktop-nav a.active::after {
  transform: scaleX(1);
  background: var(--accent-2);
}

.twin-main {
  min-height: calc(100dvh - 90px);
  padding: 150px 0 84px;
}

/* Compact AI-page introduction */
.twin-intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 48px;
  margin-bottom: 48px;
}

.twin-intro-copy {
  max-width: 770px;
}

.twin-intro-copy h1 {
  max-width: 760px;
  margin: 0;
  color: var(--twin-text);
  font-size: clamp(3.6rem, 7.5vw, 7.2rem);
  line-height: 0.88;
  letter-spacing: -0.075em;
}

.twin-intro-copy h1 span {
  color: transparent;
  background: linear-gradient(90deg, var(--accent-2), var(--accent), var(--accent-3));
  background-clip: text;
  -webkit-background-clip: text;
}

.twin-intro-copy > p:last-child {
  max-width: 650px;
  margin: 30px 0 0;
  color: var(--twin-muted);
  font-size: clamp(1rem, 1.5vw, 1.18rem);
  line-height: 1.75;
}

.twin-presence {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 220px;
  padding: 14px 18px 14px 14px;
  border: 1px solid var(--twin-border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  box-shadow: 0 18px 55px rgba(0, 0, 0, 0.16);
}

.presence-orbit {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  flex: 0 0 48px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 50%;
  background: linear-gradient(145deg, var(--accent-soft), rgba(255, 255, 255, 0.08));
  box-shadow: inset 0 0 20px var(--accent-soft);
}

.presence-orbit i {
  font-size: 0.9rem;
  font-style: normal;
  font-weight: 800;
}

.twin-presence > span:last-child {
  display: grid;
  gap: 2px;
}

.twin-presence small {
  color: var(--twin-muted);
  font-size: 0.69rem;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.twin-presence strong {
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--twin-text);
  font-size: 0.82rem;
}

.twin-presence strong i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-3);
  box-shadow: 0 0 12px var(--accent-3);
}

/* Main conversation application surface */
.twin-workspace {
  overflow: hidden;
  border: 1px solid var(--twin-border);
  border-radius: var(--twin-radius-lg);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.035), transparent 32%),
    var(--twin-panel);
  box-shadow: 0 36px 110px rgba(0, 0, 0, 0.3);
}

.workspace-topbar {
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 28px;
  border-bottom: 1px solid var(--twin-border);
}

.workspace-topbar > div,
.workspace-topbar > div > span:last-child {
  display: flex;
  align-items: center;
}

.workspace-topbar > div {
  gap: 12px;
}

.workspace-topbar > div > span:last-child {
  align-items: flex-start;
  flex-direction: column;
  gap: 1px;
}

.workspace-mark,
.thinking-mark {
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: white;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  font-weight: 800;
}

.workspace-mark {
  width: 40px;
  height: 40px;
  font-size: 0.8rem;
  box-shadow: 0 10px 28px var(--accent-soft);
}

.workspace-topbar strong {
  font-size: 0.92rem;
  line-height: 1.2;
}

.workspace-topbar small {
  color: var(--twin-muted-dark);
  font-size: 0.7rem;
}

.new-chat-button {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 14px;
  border: 1px solid var(--twin-border);
  border-radius: 999px;
  color: var(--twin-muted);
  background: transparent;
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  transition: color var(--twin-transition), border-color var(--twin-transition), background var(--twin-transition);
}

.new-chat-button svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.new-chat-button:hover {
  color: white;
  border-color: var(--twin-border-active);
  background: rgba(255, 255, 255, 0.055);
}

.conversation-stage {
  position: relative;
  min-height: 540px;
}

/* Useful first-run state shown before any messages exist */
.onboarding {
  min-height: 540px;
  display: grid;
  grid-template-columns: minmax(250px, 0.78fr) minmax(420px, 1.22fr);
  align-items: center;
  gap: clamp(36px, 6vw, 84px);
  padding: clamp(48px, 7vw, 88px);
  animation: twin-enter 480ms ease both;
}

.onboarding[hidden] { display: none; }

.onboarding-eyebrow {
  margin: 0 0 15px;
  color: var(--accent-2);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.onboarding-copy h2 {
  max-width: 470px;
  margin: 0;
  color: white;
  font-size: clamp(2.1rem, 4vw, 4rem);
  line-height: 0.98;
  letter-spacing: -0.06em;
}

.onboarding-copy > p:last-child {
  max-width: 430px;
  margin: 24px 0 0;
  color: var(--twin-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.suggestion-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.suggestion-card {
  position: relative;
  min-height: 146px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-content: space-between;
  gap: 26px 12px;
  padding: 19px 20px;
  overflow: hidden;
  border: 1px solid var(--twin-border);
  border-radius: var(--twin-radius-md);
  color: var(--twin-text);
  background: var(--twin-panel-soft);
  text-align: left;
  cursor: pointer;
  transition: transform var(--twin-transition), border-color var(--twin-transition), background var(--twin-transition);
}

.suggestion-card::before {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -80px;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-soft), transparent 70%);
  opacity: 0;
  transition: opacity var(--twin-transition);
}

.suggestion-card > span:nth-child(2) {
  grid-column: 1 / -1;
  max-width: 240px;
  font-size: 0.9rem;
  font-weight: 650;
  line-height: 1.42;
}

.suggestion-index {
  color: var(--twin-muted-dark);
  font-size: 0.64rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.suggestion-arrow {
  color: var(--accent-2);
  font-size: 1rem;
  transition: transform var(--twin-transition);
}

.suggestion-card:hover {
  transform: translateY(-3px);
  border-color: var(--twin-border-active);
  background: rgba(255, 255, 255, 0.065);
}

.suggestion-card:hover::before { opacity: 1; }
.suggestion-card:hover .suggestion-arrow { transform: translate(2px, -2px); }

/* Active conversation */
.message-list {
  min-height: 540px;
  max-height: min(64vh, 720px);
  overflow-y: auto;
  scroll-behavior: smooth;
  padding: 48px clamp(24px, 7vw, 86px) 80px;
  scrollbar-color: var(--twin-border-active) transparent;
  scrollbar-width: thin;
}

.message-list[hidden] { display: none; }

.chat-message {
  display: flex;
  margin-bottom: 36px;
  animation: message-enter 240ms ease both;
}

.chat-message.user { justify-content: flex-end; }

.assistant-layout {
  width: min(100%, 780px);
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 15px;
}

.assistant-avatar {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 50%;
  background: linear-gradient(145deg, var(--accent-soft), rgba(255, 255, 255, 0.06));
  color: white;
  font-size: 0.76rem;
  font-weight: 800;
}

.assistant-content { min-width: 0; }

.message-identity {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 1px 0 10px;
}

.message-identity strong {
  font-size: 0.76rem;
  letter-spacing: 0.02em;
}

.message-identity span {
  color: var(--twin-muted-dark);
  font-size: 0.67rem;
}

.assistant-text {
  color: #e7eaf5;
  font-size: 0.94rem;
  line-height: 1.75;
}

.assistant-text > :first-child { margin-top: 0; }
.assistant-text > :last-child { margin-bottom: 0; }
.assistant-text p { margin: 0 0 14px; }
.assistant-text h2,
.assistant-text h3,
.assistant-text h4 {
  margin: 26px 0 10px;
  color: white;
  line-height: 1.2;
  letter-spacing: -0.025em;
}
.assistant-text h2 { font-size: 1.28rem; }
.assistant-text h3 { font-size: 1.08rem; }
.assistant-text h4 { font-size: 0.98rem; }
.assistant-text ul,
.assistant-text ol { margin: 10px 0 16px; padding-left: 1.35rem; }
.assistant-text li { margin: 6px 0; padding-left: 4px; }
.assistant-text li::marker { color: var(--accent-2); }
.assistant-text strong { color: white; }
.assistant-text a {
  color: var(--accent-2);
  text-decoration: underline;
  text-decoration-color: rgba(53, 214, 255, 0.45);
  text-underline-offset: 3px;
}
.assistant-text code:not(pre code) {
  padding: 2px 6px;
  border: 1px solid var(--twin-border);
  border-radius: 6px;
  color: var(--accent-3);
  background: rgba(255, 255, 255, 0.055);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.84em;
}

.code-block {
  margin: 18px 0;
  overflow: hidden;
  border: 1px solid var(--twin-border);
  border-radius: var(--twin-radius-sm);
  background: #080b18;
}

.code-toolbar {
  min-height: 38px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px 0 14px;
  border-bottom: 1px solid var(--twin-border);
  color: var(--twin-muted-dark);
  font-size: 0.67rem;
}

.copy-code {
  padding: 5px 8px;
  border: 0;
  border-radius: 7px;
  color: var(--twin-muted);
  background: transparent;
  font-size: 0.67rem;
  cursor: pointer;
}

.copy-code:hover { color: white; background: rgba(255, 255, 255, 0.07); }

.code-block pre {
  margin: 0;
  overflow-x: auto;
  padding: 17px;
}

.code-block code {
  color: #dfe5f5;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.8rem;
  line-height: 1.65;
}

.user-bubble {
  max-width: min(76%, 620px);
  padding: 14px 18px;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  border-radius: 20px 20px 5px 20px;
  color: white;
  background: linear-gradient(135deg, var(--accent-soft), rgba(255, 255, 255, 0.055));
  font-size: 0.92rem;
  line-height: 1.55;
  white-space: pre-wrap;
}

.thinking {
  position: absolute;
  bottom: 25px;
  left: clamp(24px, 7vw, 86px);
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--twin-muted);
  font-size: 0.76rem;
}

.thinking[hidden] { display: none; }

.thinking-mark {
  width: 28px;
  height: 28px;
  margin-right: 5px;
  font-size: 0.58rem;
}

.thinking i {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent-2);
  animation: thinking-dot 1.1s ease-in-out infinite;
}

.thinking i:nth-of-type(2) { animation-delay: 120ms; }
.thinking i:nth-of-type(3) { animation-delay: 240ms; }

.chat-error {
  position: absolute;
  right: 24px;
  bottom: 20px;
  left: 24px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 11px;
  padding: 13px 15px;
  border: 1px solid rgba(255, 125, 125, 0.28);
  border-radius: var(--twin-radius-sm);
  color: #ffd3d3;
  background: rgba(80, 24, 34, 0.92);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.25);
}

.chat-error[hidden] { display: none; }
.chat-error > span {
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 154, 154, 0.35);
  border-radius: 50%;
  color: var(--twin-danger);
  font-size: 0.75rem;
  font-weight: 800;
}
.chat-error p { margin: 0; font-size: 0.78rem; }
.chat-error button {
  width: 30px;
  height: 30px;
  border: 0;
  border-radius: 50%;
  color: #ffd3d3;
  background: transparent;
  font-size: 1.2rem;
  cursor: pointer;
}

/* Multiline prompt input */
.chat-composer {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 10px;
  margin: 0 28px 28px;
  padding: 12px 12px 9px 18px;
  border: 1px solid var(--twin-border);
  border-radius: var(--twin-radius-md);
  background: rgba(255, 255, 255, 0.055);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.18);
  transition: border-color var(--twin-transition), box-shadow var(--twin-transition);
}

.chat-composer:focus-within {
  border-color: color-mix(in srgb, var(--accent-2) 62%, transparent);
  box-shadow: 0 0 0 3px rgba(53, 214, 255, 0.08), 0 18px 50px rgba(0, 0, 0, 0.2);
}

.chat-composer textarea {
  width: 100%;
  max-height: 150px;
  min-height: 34px;
  resize: none;
  overflow-y: auto;
  padding: 6px 0;
  border: 0;
  outline: 0;
  color: white;
  background: transparent;
  font-size: 0.93rem;
  line-height: 1.5;
}

.chat-composer textarea::placeholder { color: #737c94; }

.send-button {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 14px;
  color: #07101c;
  background: linear-gradient(135deg, var(--accent-3), var(--accent-2));
  box-shadow: 0 10px 26px var(--accent-soft);
  cursor: pointer;
  transition: transform var(--twin-transition), opacity var(--twin-transition), filter var(--twin-transition);
}

.send-button svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.send-button:hover:not(:disabled) { transform: translateY(-2px); filter: brightness(1.08); }
.send-button:disabled { opacity: 0.32; cursor: not-allowed; box-shadow: none; }

.composer-meta {
  grid-column: 1 / -1;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: #697188;
  font-size: 0.63rem;
}

.composer-meta kbd {
  font-family: inherit;
  font-size: inherit;
}

.twin-disclosure {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 9px;
  max-width: 790px;
  margin-top: 23px;
  color: var(--twin-muted-dark);
  text-align: center;
  font-size: 0.7rem;
  line-height: 1.55;
}

.twin-disclosure > span { color: var(--accent-2); }
.twin-disclosure p { margin: 0; }
.twin-disclosure a { color: var(--twin-muted); text-decoration: underline; text-underline-offset: 3px; }

.twin-footer {
  border-top: 1px solid var(--line);
  color: var(--twin-muted-dark);
  font-size: 0.75rem;
}

.twin-footer .shell {
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.twin-footer a { color: var(--twin-muted); }
.twin-footer a:hover { color: white; }

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

button:focus-visible,
a:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 3px;
}

@keyframes twin-enter {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

@keyframes message-enter {
  from { opacity: 0; transform: translateY(7px); }
  to { opacity: 1; transform: none; }
}

@keyframes thinking-dot {
  0%, 65%, 100% { opacity: 0.32; transform: translateY(0); }
  32% { opacity: 1; transform: translateY(-3px); }
}

@media (max-width: 980px) {
  .twin-intro {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .twin-presence { justify-self: start; }

  .onboarding {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .onboarding-copy h2 { max-width: 630px; }
  .onboarding-copy > p:last-child { max-width: 620px; }
}

@media (max-width: 760px) {
  .twin-main { padding: 116px 0 54px; }

  .twin-intro {
    gap: 26px;
    margin-bottom: 32px;
  }

  .twin-intro-copy h1 {
    font-size: clamp(2.9rem, 14vw, 4rem);
    line-height: 0.91;
  }

  .twin-intro-copy > p:last-child {
    margin-top: 22px;
    font-size: 0.95rem;
    line-height: 1.65;
  }

  .twin-presence {
    min-width: 0;
    padding: 10px 14px 10px 10px;
  }

  .presence-orbit { width: 40px; height: 40px; flex-basis: 40px; }

  .twin-workspace {
    width: 100%;
    border-right: 0;
    border-left: 0;
    border-radius: 0;
  }

  .workspace-topbar {
    min-height: 70px;
    padding: 0 14px;
  }

  .new-chat-button { width: 40px; padding: 0; justify-content: center; }
  .new-chat-button span { display: none; }

  .conversation-stage { min-height: 470px; }

  .onboarding {
    min-height: 470px;
    gap: 30px;
    padding: 42px 20px;
  }

  .onboarding-copy h2 {
    font-size: clamp(1.9rem, 8.8vw, 2.6rem);
    line-height: 1;
  }

  .onboarding-copy > p:last-child { margin-top: 18px; font-size: 0.87rem; }

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

  .suggestion-card {
    min-height: 0;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 13px;
    padding: 15px 16px;
    border-radius: var(--twin-radius-sm);
  }

  .suggestion-card > span:nth-child(2) {
    grid-column: auto;
    max-width: none;
    font-size: 0.82rem;
  }

  .message-list {
    min-height: 470px;
    max-height: calc(100dvh - 260px);
    padding: 32px 16px 72px;
  }

  .chat-message { margin-bottom: 28px; }

  .assistant-layout {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 11px;
  }

  .assistant-avatar { width: 34px; height: 34px; font-size: 0.64rem; }
  .assistant-text { font-size: 0.89rem; line-height: 1.68; }
  .user-bubble { max-width: 88%; font-size: 0.87rem; }

  .thinking { left: 16px; bottom: 20px; }

  .chat-composer {
    position: sticky;
    z-index: 5;
    bottom: max(10px, env(safe-area-inset-bottom));
    margin: 0 10px max(10px, env(safe-area-inset-bottom));
    padding: 10px 10px 8px 14px;
    border-radius: 18px;
  }

  .composer-meta span:first-child { display: none; }
  .composer-meta { justify-content: flex-end; }

  .twin-disclosure { padding-right: 14px; padding-left: 14px; }

  .twin-footer .shell {
    min-height: 110px;
    flex-direction: column;
    justify-content: center;
    gap: 8px;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .onboarding,
  .chat-message,
  .thinking i {
    animation: none !important;
  }

  .message-list { scroll-behavior: auto; }
}