/* public/styles.css */
:root {
  color-scheme: light dark;

  --color-bg: #ffffff;
  --color-surface: #f4f5f7;
  --color-border: #dfe2e8;
  --color-text: #14171c;
  --color-text-muted: #5b6472;
  --color-accent: #2563eb;
  --color-accent-contrast: #ffffff;
  --color-danger: #b42318;
  --color-danger-bg: #fdecea;
  --color-danger-border: #f4b9b3;
  --color-success: #1a7f4b;
  --color-focus: #2563eb;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 40px;

  --gutter: 16px;
  --content-width: 720px;
  --radius: 14px;
  --radius-sm: 8px;
  --composer-max-height: 12rem;
  --touch-target: 44px;
  --auth-card-width: 24rem;
  --header-height: calc(var(--touch-target) + 2 * var(--space-3) + 1px);
  --transition: 150ms ease;

  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-sm: 0.8125rem;
  --text-base: 1rem;
  --text-lg: 1.5rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f1115;
    --color-surface: #1a1d24;
    --color-border: #2c313b;
    --color-text: #eceef2;
    --color-text-muted: #9aa3b2;
    --color-accent: #5b93f5;
    --color-accent-contrast: #0b1220;
    --color-danger: #ff8a80;
    --color-danger-bg: #2a1614;
    --color-danger-border: #5c2b27;
    --color-success: #4cc38a;
    --color-focus: #8ab4ff;
  }
}

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

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  color: var(--color-text);
  font: var(--text-base) / 1.5 var(--font-sans);
  overflow-x: hidden;
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.container {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 2;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding-block: var(--space-3);
}

/* Hidden until the session check passes so a logged-out visitor never sees the app. */
body[data-auth="pending"] {
  visibility: hidden;
}

.site-title {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 600;
  margin-right: auto;
}

.status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.status__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-text-muted);
  transition: background var(--transition);
}

.status__dot.is-connected {
  background: var(--color-success);
}

/* On narrow screens the dot carries the state; the text stays for screen readers. */
.site-header .status__label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (min-width: 40em) {
  .site-header .status__label {
    position: static;
    width: auto;
    height: auto;
    overflow: visible;
    clip-path: none;
  }
}

/* Narrow screens: tighter header buttons and shortened labels keep five items inside 390px. */
.site-header .btn--ghost {
  padding-inline: var(--space-2);
}

.collapsible {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (min-width: 40em) {
  .site-header__inner {
    gap: var(--space-3);
  }

  .site-header .btn--ghost {
    padding-inline: var(--space-3);
  }

  .collapsible {
    position: static;
    width: auto;
    height: auto;
    overflow: visible;
    clip-path: none;
  }
}

/* Buttons */
.btn {
  font: inherit;
  font-weight: 500;
  min-height: var(--touch-target);
  padding: var(--space-2) var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: opacity var(--transition), background var(--transition);
}

.btn:hover {
  opacity: 0.88;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-accent-contrast);
}

.btn--danger {
  background: var(--color-danger-bg);
  color: var(--color-danger);
  border-color: var(--color-danger-border);
}

.btn--ghost {
  padding-inline: var(--space-3);
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
  font-size: var(--text-sm);
}

.btn--ghost[aria-pressed="true"] {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* Layout: chat column plus optional live browser panel */
.layout {
  flex: 1;
  min-width: 0;
}

.chat {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: calc(100dvh - var(--header-height));
}

/* Below the desktop breakpoint the panel replaces the chat. */
.layout[data-browser="open"] .chat {
  display: none;
}

@media (min-width: 64em) {
  .layout[data-browser="open"] {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .layout[data-browser="open"] .chat {
    display: flex;
  }

  .browser {
    border-left: 1px solid var(--color-border);
  }
}

/* Live browser panel */
.browser {
  position: sticky;
  top: var(--header-height);
  align-self: start;
  display: flex;
  flex-direction: column;
  min-width: 0;
  height: calc(100dvh - var(--header-height));
  background: var(--color-bg);
}

.browser__toolbar {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3) var(--gutter);
  border-bottom: 1px solid var(--color-border);
}

.browser__row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.browser__tab,
.browser__url {
  flex: 1;
}

.browser__live {
  flex: none;
}

.browser__title {
  margin: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.browser__viewport {
  flex: 1;
  min-height: 0;
  overflow: auto;
  background: var(--color-surface);
}

.browser__message {
  margin: 0;
  padding: var(--space-6) var(--gutter);
  text-align: center;
  color: var(--color-text-muted);
}

.browser__canvas {
  display: block;
  width: 100%;
  height: auto;
  background: var(--color-bg);
  cursor: default;
  user-select: none;
  -webkit-user-select: none;
}

/* :focus (not :focus-visible) because mouse users must see that typing is captured. */
.browser__canvas:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: -2px;
}

.browser__hint {
  margin: 0;
  padding: var(--space-2) var(--gutter);
  padding-bottom: calc(var(--space-2) + env(safe-area-inset-bottom));
  border-top: 1px solid var(--color-border);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.field {
  min-width: 0;
  min-height: var(--touch-target);
  padding: var(--space-2) var(--space-3);
  font: inherit;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.field:disabled {
  opacity: 0.6;
}

/* Main / empty state */
.main {
  flex: 1;
  padding-block: var(--space-5);
}

.empty {
  padding-block: var(--space-6);
  text-align: center;
}

.empty__title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-lg);
}

.empty__hint {
  margin: 0 0 var(--space-5);
  color: var(--color-text-muted);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.agent-pick {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  margin: 0 0 var(--space-5);
}

.recent__title {
  margin: var(--space-6) 0 var(--space-2);
}

.recent {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-width: var(--auth-card-width);
  margin: 0 auto;
  padding: 0;
  list-style: none;
}

.recent__item {
  width: 100%;
  text-align: start;
  border-radius: var(--radius-sm);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chip {
  max-width: 100%;
  min-height: 44px;
  padding: var(--space-2) var(--space-4);
  font: inherit;
  font-size: 0.9375rem;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  cursor: pointer;
  text-wrap: balance;
  transition: border-color var(--transition);
}

.chip:hover {
  border-color: var(--color-accent);
}

/* Messages */
.messages {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.message {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  min-width: 0;
}

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

.bubble {
  max-width: 100%;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.message--user .bubble {
  max-width: 85%;
  background: var(--color-accent);
  color: var(--color-accent-contrast);
}

.message--assistant .bubble {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.message--assistant .bubble a {
  color: var(--color-accent);
}

.bubble--error {
  background: var(--color-danger-bg);
  border-color: var(--color-danger-border);
  color: var(--color-danger);
}

.bubble--stopped {
  color: var(--color-text-muted);
  font-style: italic;
}

/* Working indicator */
.working {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.working__dots {
  display: inline-flex;
  gap: var(--space-1);
}

.working__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  animation: pulse 1.2s ease-in-out infinite;
}

.working__dot:nth-child(2) {
  animation-delay: 0.2s;
}

.working__dot:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes pulse {
  0%,
  80%,
  100% {
    opacity: 0.25;
  }
  40% {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .working__dot {
    animation: none;
  }
}

/* Activity steps */
.steps-details summary {
  width: fit-content;
  cursor: pointer;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
}

.steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin: var(--space-2) 0 0;
  padding: 0 0 0 var(--space-3);
  list-style: none;
  border-left: 2px solid var(--color-border);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.message > .steps {
  margin-top: 0;
}

.step {
  display: flex;
  gap: var(--space-2);
  min-width: 0;
}

.step__kind {
  flex: none;
  min-width: 4.5rem;
  text-transform: uppercase;
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  padding-top: 0.15em;
}

.step__text {
  min-width: 0;
  overflow-wrap: anywhere;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  overflow: hidden;
}

.step--command .step__text {
  font-family: var(--font-mono);
}

/* Composer */
.composer {
  position: sticky;
  bottom: 0;
  z-index: 2;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-3);
  padding-bottom: calc(var(--space-3) + env(safe-area-inset-bottom));
}

.composer__inner {
  display: flex;
  align-items: flex-end;
  gap: var(--space-2);
}

/* Mirror element sizes the grid so the textarea auto-grows without JS style writes. */
.grow-wrap {
  flex: 1;
  min-width: 0;
  display: grid;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color var(--transition);
}

.grow-wrap:focus-within {
  border-color: var(--color-focus);
  outline: 2px solid var(--color-focus);
  outline-offset: 1px;
}

.grow-wrap.is-disabled {
  opacity: 0.6;
}

.grow-wrap::after,
.grow-wrap__input {
  grid-area: 1 / 1 / 2 / 2;
  max-height: var(--composer-max-height);
  margin: 0;
  padding: 0;
  border: 0;
  font: inherit;
  line-height: 1.5;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.grow-wrap::after {
  content: attr(data-value) " ";
  visibility: hidden;
  overflow: hidden;
  pointer-events: none;
}

.grow-wrap__input {
  resize: none;
  overflow-y: auto;
  background: transparent;
  color: inherit;
}

.grow-wrap__input:focus-visible {
  outline: none;
}

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

/* Login */
.auth {
  flex: 1;
  display: grid;
  place-items: center;
  padding: var(--space-5) var(--gutter);
}

.auth__card {
  width: 100%;
  max-width: var(--auth-card-width);
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.auth__title {
  margin: 0 0 var(--space-1);
  font-size: var(--text-lg);
}

.auth__subtitle {
  margin: 0 0 var(--space-5);
  color: var(--color-text-muted);
}

.auth__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.auth__label {
  font-size: var(--text-sm);
  font-weight: 500;
}

.auth__field {
  width: 100%;
  background: var(--color-bg);
}

.auth__button {
  width: 100%;
}

.auth__status {
  margin: var(--space-4) 0 0;
  color: var(--color-text);
}

.auth__status:empty {
  display: none;
}

.auth__status--error {
  color: var(--color-danger);
}