/* BlueAtlasAI — shared tokens and the chat interface.
   Direction: a marine chart. Light is chart paper under daylight; dark is the
   same chart at night — deep water, luminous soundings, a glowing graticule.
   Every colour is a token so the two schemes stay in step.

   The dark block appears twice on purpose: once for an explicit choice, once
   for visitors following their system with JavaScript off. */

:root {
  color-scheme: light;

  --paper:      #EFF2F5;
  --card:       #FFFFFF;
  --ink:        #0C1A24;
  --slate:      #5A6C79;
  --line:       #D5DDE3;
  --line-soft:  #E7ECF0;
  --soft:       #E7EDF2;
  --deep:       #0B2E4A;
  --mid:        #1B5E8C;
  --shoal:      #8FBBD4;

  --veil:       rgba(255, 255, 255, .82);
  --wash:       rgba(11, 46, 74, .06);
  --placeholder:#93A0AA;
  --fine:       #7B8892;
  --lift:       0 12px 28px -20px rgba(11, 46, 74, .55);

  --btn-bg:       #0B2E4A;
  --btn-bg-hover: #1B5E8C;
  --btn-ink:      #EAF2F7;
  --btn-off:      #98A6B0;
  --ghost-ink:    #0B2E4A;

  --bubble-bg:  #0B2E4A;
  --bubble-ink: #E9F1F6;

  --band-bg:      #0B2E4A;
  --band-ink:     #DCE9F1;
  --band-muted:   #8FBBD4;
  --band-rule:    rgba(143, 187, 212, .18);
  --band-contour: rgba(143, 187, 212, .18);
  --band-grid:    rgba(143, 187, 212, .07);

  --code-bg:  #0A1C2A;
  --code-ink: #D9E6EE;
  --tick-bg:  #E3E9ED;

  --err-bg:   #FAF0ED;
  --err-ink:  #7A2E22;
  --err-line: #A8452F;

  --table-head: #F3F6F8;

  --contour:   rgba(27, 94, 140, .16);
  --contour-2: rgba(27, 94, 140, .12);
  --grid:      rgba(11, 46, 74, .045);
  --glow:      #D9E7F0;

  --tint-ink: #FFFFFF;

  --display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --accent:  "Newsreader", Georgia, "Times New Roman", serif;

  --wrap: 860px;
}

:root[data-theme="dark"] {
  color-scheme: dark;

  --paper:      #08141D;
  --card:       #0F1F2B;
  --ink:        #DCE7EF;
  --slate:      #8496A3;
  --line:       #1E3242;
  --line-soft:  #18293A;
  --soft:       #0B1A24;
  --deep:       #8FC3E2;
  --mid:        #5CA8D6;
  --shoal:      #7FB7DA;

  --veil:       rgba(8, 20, 29, .84);
  --wash:       rgba(143, 187, 212, .09);
  --placeholder:#6C7E8B;
  --fine:       #6F808C;
  --lift:       0 14px 30px -20px rgba(0, 0, 0, .85);

  --btn-bg:       #1B5E8C;
  --btn-bg-hover: #2C7CB3;
  --btn-ink:      #F1F8FC;
  --btn-off:      #2A3F52;
  --ghost-ink:    #9FC6DE;

  --bubble-bg:  #17475F;
  --bubble-ink: #E4F0F7;

  --band-bg:      #0B1D28;
  --band-ink:     #DCE9F1;
  --band-muted:   #7FB7DA;
  --band-rule:    rgba(143, 187, 212, .14);
  --band-contour: rgba(92, 168, 214, .15);
  --band-grid:    rgba(92, 168, 214, .06);

  --code-bg:  #061019;
  --code-ink: #CBDDE9;
  --tick-bg:  #1B2E3C;

  --err-bg:   #2A1512;
  --err-ink:  #F0B3A2;
  --err-line: #A8452F;

  --table-head: #132433;

  --contour:   rgba(92, 168, 214, .13);
  --contour-2: rgba(92, 168, 214, .09);
  --grid:      rgba(143, 187, 212, .05);
  --glow:      #0E2634;

  --tint-ink: #061019;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;

    --paper:      #08141D;
    --card:       #0F1F2B;
    --ink:        #DCE7EF;
    --slate:      #8496A3;
    --line:       #1E3242;
    --line-soft:  #18293A;
    --soft:       #0B1A24;
    --deep:       #8FC3E2;
    --mid:        #5CA8D6;
    --shoal:      #7FB7DA;

    --veil:       rgba(8, 20, 29, .84);
    --wash:       rgba(143, 187, 212, .09);
    --placeholder:#6C7E8B;
    --fine:       #6F808C;
    --lift:       0 14px 30px -20px rgba(0, 0, 0, .85);

    --btn-bg:       #1B5E8C;
    --btn-bg-hover: #2C7CB3;
    --btn-ink:      #F1F8FC;
    --btn-off:      #2A3F52;
    --ghost-ink:    #9FC6DE;

    --bubble-bg:  #17475F;
    --bubble-ink: #E4F0F7;

    --band-bg:      #0B1D28;
    --band-ink:     #DCE9F1;
    --band-muted:   #7FB7DA;
    --band-rule:    rgba(143, 187, 212, .14);
    --band-contour: rgba(92, 168, 214, .15);
    --band-grid:    rgba(92, 168, 214, .06);

    --code-bg:  #061019;
    --code-ink: #CBDDE9;
    --tick-bg:  #1B2E3C;

    --err-bg:   #2A1512;
    --err-ink:  #F0B3A2;
    --err-line: #A8452F;

    --table-head: #132433;

    --contour:   rgba(92, 168, 214, .13);
    --contour-2: rgba(92, 168, 214, .09);
    --grid:      rgba(143, 187, 212, .05);
    --glow:      #0E2634;

    --tint-ink: #061019;
  }
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--display);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

:focus-visible {
  outline: 2px solid var(--mid);
  outline-offset: 2px;
}

/* ------------------------------------------------------------------- brand */

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  color: inherit;
}

.brand__mark { flex: 0 0 auto; }

.brand__name {
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.025em;
}

.brand__name em {
  font-style: normal;
  color: var(--mid);
}

/* ------------------------------------------------------------ theme toggle */

.themetoggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  color: var(--slate);
  background: none;
  border: 1px solid var(--line);
  border-radius: 9px;
  cursor: pointer;
  transition: color 140ms ease, border-color 140ms ease;
}

.themetoggle:hover { color: var(--ink); border-color: var(--slate); }

.themetoggle svg { display: none; }

:root[data-theme="dark"] .themetoggle .icon-sun { display: block; }
:root[data-theme="light"] .themetoggle .icon-moon { display: block; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .themetoggle .icon-sun { display: block; }
  :root:not([data-theme="light"]) .themetoggle .icon-moon { display: none; }
}

/* ----------------------------------------------------------------- chat app */

.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
}

.topbar {
  flex: 0 0 auto;
  border-bottom: 1px solid var(--line);
  background: var(--veil);
  backdrop-filter: blur(8px);
}

.topbar__inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.topbar__spacer { margin-left: auto; }

.topbar__link {
  font-size: 14px;
  font-weight: 500;
  color: var(--slate);
  text-decoration: none;
  padding: 7px 12px;
  border-radius: 7px;
}

.topbar__link:hover { color: var(--ink); background: var(--wash); }

.stage {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.transcript {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 36px 20px 40px;
}

/* ------------------------------------------------------------- chat intro */

.intro { padding: 20px 0 8px; }

.intro__title {
  margin: 0 0 12px;
  font-size: clamp(27px, 5vw, 38px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.035em;
}

.intro__body {
  margin: 0 0 26px;
  max-width: 48ch;
  color: var(--slate);
  font-family: var(--accent);
  font-style: italic;
  font-size: 18px;
  line-height: 1.55;
}

.intro__chips { display: flex; flex-wrap: wrap; gap: 8px; }

.chip {
  font-family: var(--display);
  font-size: 14px;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 15px;
  cursor: pointer;
  transition: border-color 140ms ease, transform 140ms ease;
}

.chip:hover { border-color: var(--mid); transform: translateY(-1px); }

/* ------------------------------------------------------------------ messages */

.msg { margin-bottom: 26px; display: flex; flex-direction: column; }

.msg--user { align-items: flex-end; }

.msg.is-hidden { display: none; }

.msg__label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 6px;
}

.msg__body {
  max-width: 64ch;
  padding: 13px 17px;
  border-radius: 12px 12px 12px 4px;
  background: var(--card);
  border: 1px solid var(--line);
}

.msg--user .msg__body {
  background: var(--bubble-bg);
  border-color: var(--bubble-bg);
  color: var(--bubble-ink);
  border-radius: 12px 12px 4px 12px;
  white-space: pre-wrap;
}

.msg__body > :first-child { margin-top: 0; }
.msg__body > :last-child { margin-bottom: 0; }
.msg__body p { margin: 0 0 12px; }
.msg__body ul, .msg__body ol { margin: 0 0 12px; padding-left: 22px; }
.msg__body li { margin-bottom: 4px; }
.msg__body a { color: var(--mid); }

.msg__body h2, .msg__body h3, .msg__body h4 {
  font-size: 16px;
  font-weight: 700;
  margin: 18px 0 8px;
  letter-spacing: -0.02em;
}

.msg__body pre {
  margin: 0 0 12px;
  padding: 12px 14px;
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: 8px;
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  line-height: 1.55;
}

.msg__body code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13.5px;
  background: var(--tick-bg);
  padding: 1px 5px;
  border-radius: 3px;
}

.msg__body pre code { background: none; padding: 0; font-size: inherit; }

.msg__body .caret {
  display: inline-block;
  width: 7px; height: 15px;
  margin-left: 1px;
  vertical-align: -2px;
  background: var(--mid);
  animation: blink 1.05s steps(1, end) infinite;
}

@keyframes blink { 50% { opacity: .15; } }

.msg__more {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 11px;
}

.msg__more-note {
  font-size: 13.5px;
  color: var(--slate);
}

.msg__more-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--display);
  font-weight: 600;
  font-size: 13.5px;
  color: var(--deep);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 16px;
  cursor: pointer;
  transition: border-color 140ms ease, color 140ms ease;
}

.msg__more-btn:hover { border-color: var(--mid); color: var(--mid); }

.msg__error {
  border-color: var(--err-line);
  background: var(--err-bg);
  color: var(--err-ink);
}

/* ----------------------------------------------------------------- the ad */

.slot {
  --tint: var(--mid);
  --tint-lift: var(--shoal);
  --tint-used: var(--tint);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 26px;
  box-shadow: var(--lift);
  animation: slot-in 240ms cubic-bezier(.2, .7, .3, 1) both;
}

@keyframes slot-in { from { opacity: 0; transform: translateY(10px); } }

.slot.is-closing { animation: slot-out 200ms ease both; }

@keyframes slot-out { to { opacity: 0; transform: translateY(-6px); } }

:root[data-theme="dark"] .slot { --tint-used: var(--tint-lift); }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .slot { --tint-used: var(--tint-lift); }
}

.slot__rule { height: 3px; background: var(--tint-used); }

.slot__meta {
  padding: 11px 18px 0;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--slate);
}

.slot__main {
  padding: 14px 18px 22px;
  overflow: hidden;
  transition: height 320ms cubic-bezier(.3, .7, .3, 1), opacity 170ms ease;
}

.slot__main.is-swapping { opacity: 0; }

.slot__advertiser {
  margin: 0 0 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--tint);
}

.slot__headline {
  margin: 0 0 10px;
  font-size: clamp(21px, 3.6vw, 27px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.03em;
  max-width: 24ch;
}

.slot__copy {
  margin: 0 0 20px;
  color: var(--slate);
  font-size: 15px;
  max-width: 46ch;
}

.slot__cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--tint-used);
  color: var(--tint-ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  padding: 11px 18px;
  border-radius: 8px;
  transition: filter 140ms ease;
}

.slot__cta:hover { filter: brightness(1.12); }

.slot__foot { border-top: 1px solid var(--line); }

.slot__row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 18px;
}

.slot__status {
  font-size: 13px;
  color: var(--slate);
  margin-right: auto;
}

.slot__track { height: 3px; background: var(--line); overflow: hidden; }

/* Indeterminate: nobody knows how long the answer takes, so don't pretend
   to know. It sweeps until the answer lands, then fills solid. */
.slot__fill {
  height: 100%;
  width: 100%;
  background: var(--shoal);
  transform-origin: left center;
  animation: sweep 1.5s cubic-bezier(.5, 0, .5, 1) infinite;
}

@keyframes sweep {
  0%   { transform: translateX(-100%) scaleX(.35); }
  50%  { transform: translateX(25%) scaleX(.5); }
  100% { transform: translateX(100%) scaleX(.35); }
}

.slot.is-ready .slot__fill {
  animation: none;
  transform: none;
  background: var(--mid);
}

.slot.is-ready .slot__status { color: var(--mid); font-weight: 500; }

/* ---------------------------------------------------------------------- dock */

.dock {
  flex: 0 0 auto;
  border-top: 1px solid var(--line);
  background: var(--veil);
  backdrop-filter: blur(8px);
}

.notice {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 11px 20px 0;
  font-size: 13.5px;
  color: var(--err-ink);
}

.notice code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12.5px;
  background: var(--tick-bg);
  padding: 1px 5px;
  border-radius: 3px;
}

.composer {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 14px 20px 12px;
  display: flex;
  align-items: flex-end;
  gap: 10px;
}

.composer__input {
  flex: 1 1 auto;
  resize: none;
  max-height: 190px;
  padding: 12px 14px;
  font-family: var(--display);
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
}

.composer__input:focus { border-color: var(--mid); outline: none; }
.composer__input::placeholder { color: var(--placeholder); }

.composer__send {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 18px;
  font-family: var(--display);
  font-weight: 600;
  font-size: 15px;
  color: var(--btn-ink);
  background: var(--btn-bg);
  border: 0;
  border-radius: 10px;
  cursor: pointer;
  transition: background 140ms ease;
}

.composer__send:hover { background: var(--btn-bg-hover); }
.composer__send[disabled] { background: var(--btn-off); cursor: default; }

/* -------------------------------------------------------------- disclaimer */

.disclaimer {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 20px 14px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--fine);
}

.disclaimer a { color: var(--fine); }

/* -------------------------------------------------------------------- mobile */

@media (max-width: 560px) {
  .transcript { padding: 24px 14px 30px; }
  .disclaimer { padding: 0 14px 12px; }
  .topbar__inner { padding: 11px 14px; }
  .composer { padding: 12px 14px 16px; }
  .notice { padding: 10px 14px 0; }
  .msg__body { max-width: 100%; }
  .composer__send span { display: none; }
  .composer__send { padding: 13px 15px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}