/* DEUS AI — calm, editorial conversation interface */

:root {
  color-scheme: light;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Helvetica, Arial, sans-serif;
  --font-serif: ui-serif, Georgia, Cambria, "Times New Roman", serif;
  --ink: #1f2933;
  --ink-soft: #4d5a66;
  --muted: #74808b;
  --faint: #a2abb3;
  --canvas: #f5f6f3;
  --canvas-glow: #fbfcfa;
  --surface: #ffffff;
  --surface-soft: #fafbf9;
  --surface-muted: #f2f5f2;
  --line: #e4e8e4;
  --line-strong: #d7ddd8;
  --navy: #18354f;
  --navy-hover: #244d70;
  --navy-active: #112a40;
  --user-bubble: #eaf2f8;
  --user-border: #d7e5ef;
  --success: #2e7559;
  --shadow-sm: 0 3px 10px rgb(23 38 48 / 0.04);
  --shadow-card: 0 24px 70px rgb(23 38 48 / 0.09), 0 3px 12px rgb(23 38 48 / 0.04);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 30px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --ink: #edf2f0;
    --ink-soft: #c4cfca;
    --muted: #a0aca6;
    --faint: #78847e;
    --canvas: #121816;
    --canvas-glow: #18201d;
    --surface: #1b2420;
    --surface-soft: #202a25;
    --surface-muted: #26312c;
    --line: #344039;
    --line-strong: #46534b;
    --navy: #78a9ce;
    --navy-hover: #98c3e2;
    --navy-active: #c4e0f4;
    --user-bubble: #213a4b;
    --user-border: #31566d;
    --success: #7bca9f;
    --shadow-sm: 0 3px 10px rgb(0 0 0 / 0.18);
    --shadow-card: 0 24px 70px rgb(0 0 0 / 0.28), 0 3px 12px rgb(0 0 0 / 0.15);
  }
}

* { box-sizing: border-box; }

html { min-width: 320px; scroll-behavior: smooth; }

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 50% -14%, var(--canvas-glow) 0, transparent 39rem),
    var(--canvas);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

button, textarea { font: inherit; }
button { -webkit-tap-highlight-color: transparent; }
button:focus-visible, textarea:focus-visible, a:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--navy) 40%, transparent);
  outline-offset: 3px;
}

::selection { background: color-mix(in srgb, var(--navy) 20%, transparent); color: var(--ink); }

.page {
  width: min(100% - 40px, 1050px);
  margin: 0 auto;
  padding: clamp(56px, 8vw, 96px) 0 34px;
}

/* Hero */
.hero { max-width: 700px; margin: 0 auto clamp(32px, 5vw, 52px); text-align: center; }
.hero-logo { display: grid; place-items: center; margin-bottom: 20px; }
.logo-circle {
  display: grid;
  width: 58px;
  height: 58px;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--navy) 15%, var(--line));
  border-radius: 50%;
  background: var(--navy);
  box-shadow: 0 10px 25px rgb(24 53 79 / 0.17);
  color: #fff;
  font-family: var(--font-serif);
  font-size: 31px;
  font-weight: 600;
  line-height: 1;
  animation: enter-up 620ms var(--ease) both;
}
.hero h1 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(2.1rem, 5.2vw, 3.35rem);
  font-weight: 750;
  letter-spacing: -0.065em;
  line-height: 1;
  animation: enter-up 620ms 60ms var(--ease) both;
}
.hero-subtitle, .subtitle {
  margin: 12px 0 0;
  color: var(--navy);
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  font-weight: 650;
  letter-spacing: -0.015em;
  animation: enter-up 620ms 110ms var(--ease) both;
}
.hero-description, .description {
  max-width: 620px;
  margin: 19px auto 0;
  color: var(--ink-soft);
  font-size: clamp(0.98rem, 2vw, 1.08rem);
  line-height: 1.72;
  animation: enter-up 620ms 160ms var(--ease) both;
}
.hero-tagline {
  display: inline-flex;
  margin-top: 22px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface) 78%, transparent);
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.4;
  animation: enter-up 620ms 210ms var(--ease) both;
}

/* Chat shell */
.chat-card {
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--line) 88%, transparent);
  border-radius: var(--radius-xl);
  background: var(--surface);
  box-shadow: var(--shadow-card);
  animation: enter-up 720ms 200ms var(--ease) both;
}
.chat-window, #chat-window {
  height: clamp(430px, 56vh, 660px);
  min-height: 390px;
  padding: clamp(22px, 4vw, 42px);
  overflow-y: auto;
  overscroll-behavior: contain;
  background: linear-gradient(135deg, var(--surface-soft), var(--surface) 42%);
  scrollbar-color: var(--line-strong) transparent;
  scrollbar-width: thin;
}
.chat-window::-webkit-scrollbar, #chat-window::-webkit-scrollbar { width: 10px; }
.chat-window::-webkit-scrollbar-track, #chat-window::-webkit-scrollbar-track { background: transparent; }
.chat-window::-webkit-scrollbar-thumb, #chat-window::-webkit-scrollbar-thumb {
  border: 3px solid transparent;
  border-radius: 20px;
  background: var(--line-strong);
  background-clip: padding-box;
}
.chat-window::-webkit-scrollbar-thumb:hover, #chat-window::-webkit-scrollbar-thumb:hover { background-color: var(--muted); }

/* Messages */
.message {
  width: fit-content;
  max-width: min(86%, 760px);
  margin: 0 0 25px;
  padding: 18px 20px;
  border-radius: 5px var(--radius-md) var(--radius-md) var(--radius-md);
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.68;
  animation: message-in 400ms var(--ease) both;
}
.message.ai {
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}
.message.user {
  margin-left: auto;
  border: 1px solid var(--user-border);
  border-radius: var(--radius-md) 5px var(--radius-md) var(--radius-md);
  background: var(--user-bubble);
}
.message-header { display: flex; align-items: center; gap: 10px; margin: 0 0 14px; }
.avatar {
  display: grid;
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 50%;
  background: var(--navy);
  color: #fff;
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  line-height: 1;
}
.sender {
  color: var(--ink);
  font-size: 0.74rem;
  font-weight: 750;
  letter-spacing: 0.075em;
  line-height: 1.2;
  text-transform: uppercase;
}
.timestamp { margin-top: 2px; color: var(--muted); font-size: 0.72rem; line-height: 1.2; }
.message.user .sender { color: var(--navy); }
.message-body, .message .content { max-width: 70ch; }
.message-body > :first-child, .message .content > :first-child { margin-top: 0; }
.message-body > :last-child, .message .content > :last-child { margin-bottom: 0; }
.message p, .message .content { margin: 0 0 0.9em; }
.message .content { white-space: pre-wrap; }

/* Markdown content returned by the application */
.message-body h1, .message-body h2, .message-body h3,
.message .content h1, .message .content h2, .message .content h3 {
  margin: 1.45em 0 0.55em;
  color: var(--ink);
  font-weight: 730;
  letter-spacing: -0.025em;
  line-height: 1.2;
}
.message-body h1, .message .content h1 { font-size: 1.45em; }
.message-body h2, .message .content h2 { font-size: 1.22em; }
.message-body h3, .message .content h3 { font-size: 1.05em; }
.message-body strong, .message .content strong { font-weight: 720; }
.message-body em, .message .content em { color: var(--ink-soft); }
.message-body a, .message .content a { color: var(--navy); font-weight: 620; text-decoration-color: color-mix(in srgb, var(--navy) 45%, transparent); text-underline-offset: 0.16em; }
.message-body a:hover, .message .content a:hover { text-decoration-color: currentColor; }
.message-body ul, .message-body ol, .message .content ul, .message .content ol { margin: 0.85em 0; padding-left: 1.25em; }
.message-body li, .message .content li { margin: 0.36em 0; padding-left: 0.2em; }
.message-body li::marker, .message .content li::marker { color: var(--navy); }
.message-body blockquote, .message .content blockquote { margin: 1em 0; padding: 0.15em 0 0.15em 1em; border-left: 3px solid var(--line-strong); color: var(--ink-soft); font-family: var(--font-serif); font-size: 1.06em; }
.message-body hr, .message .content hr { height: 1px; margin: 1.4em 0; border: 0; background: var(--line); }
.message-body code, .message .content code { padding: 0.12em 0.35em; border-radius: 5px; background: var(--surface-muted); color: var(--navy); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.86em; }
.message-body pre, .message .content pre { max-width: 100%; margin: 1em 0; padding: 13px; overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--surface-muted); }
.message-body pre code, .message .content pre code { padding: 0; background: transparent; color: var(--ink); }

/* Thinking/loading state; app.js can append either class */
.message.loading, .thinking-message {
  display: flex;
  align-items: center;
  gap: 9px;
  min-width: 125px;
  color: var(--muted);
  font-size: 0.9rem;
}
.typing-dots { display: inline-flex; align-items: center; gap: 4px; height: 14px; }
.typing-dots span, .loading-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--navy);
  animation: typing-bounce 1.15s ease-in-out infinite;
}
.typing-dots span:nth-child(2), .loading-dot:nth-child(2) { animation-delay: 140ms; }
.typing-dots span:nth-child(3), .loading-dot:nth-child(3) { animation-delay: 280ms; }
.is-loading { cursor: wait; }
.is-loading .send-button { pointer-events: none; opacity: 0.62; }

/* Suggested questions */
.examples { padding: 18px clamp(22px, 4vw, 42px) 17px; border-top: 1px solid var(--line); background: var(--surface); }
.examples-title { margin-bottom: 10px; color: var(--muted); font-size: 0.74rem; font-weight: 700; letter-spacing: 0.075em; text-transform: uppercase; }
.example-list { display: flex; flex-wrap: wrap; gap: 8px; }
.example {
  min-height: 33px;
  padding: 6px 11px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 0.83rem;
  font-weight: 580;
  line-height: 1.2;
  transition: border-color 180ms var(--ease), background 180ms var(--ease), color 180ms var(--ease), transform 180ms var(--ease), box-shadow 180ms var(--ease);
}
.example:hover { border-color: color-mix(in srgb, var(--navy) 35%, var(--line)); background: color-mix(in srgb, var(--navy) 6%, var(--surface)); color: var(--navy); box-shadow: var(--shadow-sm); transform: translateY(-1px); }
.example:active { transform: translateY(0); box-shadow: none; }

/* Composer */
.composer, .input-area { display: flex; align-items: flex-end; gap: 12px; padding: 16px clamp(18px, 3vw, 26px); border-top: 1px solid var(--line); background: var(--surface); }
.composer textarea, .input-area textarea, textarea#question {
  display: block;
  width: 100%;
  min-width: 0;
  max-height: 190px;
  min-height: 49px;
  padding: 13px 14px;
  resize: vertical;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  background: var(--surface-soft);
  color: var(--ink);
  font-size: 0.98rem;
  line-height: 1.45;
  transition: border-color 180ms var(--ease), box-shadow 180ms var(--ease), background 180ms var(--ease);
}
.composer textarea::placeholder, .input-area textarea::placeholder { color: var(--faint); opacity: 1; }
.composer textarea:hover, .input-area textarea:hover { border-color: var(--muted); }
.composer textarea:focus, .input-area textarea:focus { border-color: var(--navy); background: var(--surface); box-shadow: 0 0 0 4px color-mix(in srgb, var(--navy) 10%, transparent); outline: 0; }
.send-button, #send, .input-area button {
  display: inline-flex;
  min-width: max-content;
  min-height: 49px;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  border: 1px solid var(--navy);
  border-radius: var(--radius-md);
  background: var(--navy);
  box-shadow: 0 4px 10px rgb(24 53 79 / 0.15);
  color: #fff;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
  transition: transform 180ms var(--ease), background 180ms var(--ease), border-color 180ms var(--ease), box-shadow 180ms var(--ease), opacity 180ms var(--ease);
}
.send-button::after, #send::after { margin-left: 7px; content: "→"; font-size: 1.15em; transition: transform 180ms var(--ease); }
.send-button:hover, #send:hover, .input-area button:hover { border-color: var(--navy-hover); background: var(--navy-hover); box-shadow: 0 8px 18px rgb(24 53 79 / 0.2); transform: translateY(-1px); }
.send-button:hover::after, #send:hover::after { transform: translateX(2px); }
.send-button:active, #send:active, .input-area button:active { background: var(--navy-active); box-shadow: none; transform: translateY(0); }
.send-button:disabled, #send:disabled, .input-area button:disabled { cursor: not-allowed; opacity: 0.55; transform: none; }

/* Citations/source cards introduced by a later API response format */
.sources, .source-list { margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line); }
.sources-title, .source-list-title { margin: 0 0 9px; color: var(--muted); font-size: 0.72rem; font-weight: 750; letter-spacing: 0.075em; text-transform: uppercase; }
.source-card {
  display: flex;
  align-items: center;
  gap: 11px;
  margin: 8px 0 0;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface-soft);
  color: inherit;
  text-decoration: none;
  transition: border-color 180ms var(--ease), background 180ms var(--ease), box-shadow 180ms var(--ease), transform 180ms var(--ease);
}
.source-card:hover { border-color: color-mix(in srgb, var(--navy) 32%, var(--line)); background: var(--surface); box-shadow: var(--shadow-sm); transform: translateY(-1px); }
.source-card-icon { display: grid; width: 29px; height: 29px; flex: 0 0 auto; place-items: center; border-radius: 8px; background: color-mix(in srgb, var(--navy) 9%, var(--surface)); color: var(--navy); font-size: 0.88rem; }
.source-card-copy { min-width: 0; }
.source-card-title { overflow: hidden; color: var(--ink); font-size: 0.88rem; font-weight: 680; line-height: 1.25; text-overflow: ellipsis; white-space: nowrap; }
.source-card-meta { margin-top: 2px; color: var(--muted); font-size: 0.75rem; line-height: 1.2; }

/* Footer */
.site-footer { max-width: 680px; margin: 25px auto 0; color: var(--muted); font-size: 0.76rem; line-height: 1.6; text-align: center; }

/* Utility states useful to the JavaScript layer */
.hidden, [hidden] { display: none !important; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.empty-state { display: grid; min-height: 100%; place-items: center; color: var(--muted); text-align: center; }
.error-message { border-color: color-mix(in srgb, #bd4141 40%, var(--line)) !important; background: color-mix(in srgb, #bd4141 7%, var(--surface)) !important; }

/* Optional response details, status labels, and content variants */
.message-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 0.73rem;
}
.message-meta time { color: inherit; }
.message-status {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--success);
  font-weight: 650;
}
.message-status::before {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  content: "";
}
.message-answer { max-width: 70ch; }
.message-answer > *:first-child { margin-top: 0; }
.message-answer > *:last-child { margin-bottom: 0; }
.message--compact { padding: 13px 15px; font-size: 0.92rem; }
.message--wide { max-width: min(94%, 840px); }
.message--notice { border-color: color-mix(in srgb, var(--navy) 24%, var(--line)); background: color-mix(in srgb, var(--navy) 5%, var(--surface)); }

.retry-button {
  margin-top: 11px;
  padding: 6px 9px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--surface);
  color: var(--navy);
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 680;
}
.retry-button:hover { border-color: var(--navy); background: color-mix(in srgb, var(--navy) 6%, var(--surface)); }

/* Native controls and link treatment kept intentionally quiet */
input, select, textarea { accent-color: var(--navy); }
a { color: var(--navy); }
button { font-family: var(--font-sans); }
button[aria-busy="true"] { cursor: progress; }
button[aria-busy="true"]::after { content: "…"; animation: subtle-pulse 900ms ease-in-out infinite; }

/* A light divider is useful when message components are generated dynamically. */
.conversation-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 23px 0;
  color: var(--faint);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.conversation-divider::before,
.conversation-divider::after {
  height: 1px;
  flex: 1;
  background: var(--line);
  content: "";
}

.scroll-to-bottom {
  position: sticky;
  bottom: 10px;
  display: grid;
  width: 34px;
  height: 34px;
  margin: -44px 4px 10px auto;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  color: var(--navy);
  cursor: pointer;
}
.scroll-to-bottom:hover { border-color: var(--navy); }

@keyframes enter-up { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
@keyframes message-in { from { opacity: 0; transform: translateY(7px) scale(0.99); } to { opacity: 1; transform: translateY(0) scale(1); } }
@keyframes typing-bounce { 0%, 60%, 100% { opacity: 0.4; transform: translateY(0); } 30% { opacity: 1; transform: translateY(-4px); } }
@keyframes subtle-pulse { 50% { opacity: 0.35; } }

@media (max-width: 680px) {
  .page { width: min(100% - 24px, 1050px); padding-top: 42px; }
  .hero { margin-bottom: 28px; }
  .logo-circle { width: 52px; height: 52px; font-size: 28px; }
  .hero-tagline { max-width: 100%; margin-top: 17px; }
  .chat-card { border-radius: var(--radius-lg); }
  .chat-window, #chat-window { height: min(58vh, 570px); min-height: 370px; padding: 20px; }
  .message { max-width: 93%; padding: 16px; font-size: 0.96rem; }
  .examples { padding: 15px 18px; }
  .composer, .input-area { gap: 9px; padding: 12px; }
  .composer textarea, .input-area textarea, textarea#question { min-height: 46px; padding: 12px; }
  .send-button, #send, .input-area button { min-height: 46px; padding: 0 14px; font-size: 0.82rem; }
  .site-footer { margin-top: 20px; }
}

@media (max-width: 470px) {
  .page { width: 100%; padding: 32px 12px 22px; }
  .hero { padding: 0 8px; }
  .hero-description, .description { line-height: 1.62; }
  .chat-card { border-radius: 20px; }
  .chat-window, #chat-window { height: 53vh; min-height: 340px; padding: 16px; }
  .message { max-width: 96%; margin-bottom: 17px; border-radius: 5px 13px 13px; }
  .message.user { border-radius: 13px 5px 13px 13px; }
  .message-header { margin-bottom: 11px; }
  .example-list { gap: 6px; }
  .example { min-height: 31px; padding: 5px 9px; font-size: 0.78rem; }
  .composer, .input-area { align-items: stretch; flex-direction: column; }
  .send-button, #send, .input-area button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: 1ms !important; animation-iteration-count: 1 !important; transition-duration: 1ms !important; }
}