:root {
  --ink: #17130f;
  --muted: #74695c;
  --paper: #f4efe5;
  --panel: #fffaf0;
  --field: #fffdf7;
  --body-copy: #3b332a;
  --line: rgba(43, 34, 24, 0.16);
  --accent: #b7411f;
  --accent-dark: #7d2d18;
  --green: #277c55;
  --shadow: 0 24px 70px rgba(31, 23, 15, 0.12);
  --grid-line: rgba(23, 19, 15, 0.035);
  --grid-line-strong: rgba(23, 19, 15, 0.03);
  --accent-wash: rgba(183, 65, 31, 0.12);
  --panel-strong: rgba(255, 250, 240, 0.88);
  --panel-medium: rgba(255, 250, 240, 0.74);
  --panel-soft: rgba(255, 250, 240, 0.62);
  --tile-soft: rgba(255, 253, 247, 0.72);
  --sidebar-bg: rgba(244, 239, 229, 0.78);
  --message-bg: rgba(23, 19, 15, 0.06);
  --danger: #9f2f1b;
  --scrollbar-size: 6px;
  --scrollbar-thumb: rgba(43, 34, 24, 0.26);
  --scrollbar-thumb-hover: rgba(43, 34, 24, 0.42);
  --scrollbar-track: transparent;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --ink: #f3eadc;
  --muted: #b6aa9b;
  --paper: #17130f;
  --panel: #241d17;
  --field: #1b1611;
  --body-copy: #dfd2c0;
  --line: rgba(243, 234, 220, 0.17);
  --accent: #d15d35;
  --accent-dark: #f09a76;
  --green: #65c794;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.34);
  --grid-line: rgba(255, 250, 240, 0.045);
  --grid-line-strong: rgba(255, 250, 240, 0.035);
  --accent-wash: rgba(209, 93, 53, 0.14);
  --panel-strong: rgba(36, 29, 23, 0.92);
  --panel-medium: rgba(36, 29, 23, 0.76);
  --panel-soft: rgba(36, 29, 23, 0.62);
  --tile-soft: rgba(33, 27, 22, 0.82);
  --sidebar-bg: rgba(23, 19, 15, 0.86);
  --message-bg: rgba(255, 250, 240, 0.08);
  --danger: #ff8a66;
  --scrollbar-thumb: rgba(243, 234, 220, 0.2);
  --scrollbar-thumb-hover: rgba(243, 234, 220, 0.34);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

html {
  scroll-behavior: smooth;
}

*::-webkit-scrollbar {
  width: var(--scrollbar-size);
  height: var(--scrollbar-size);
}

*::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}

*::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: var(--scrollbar-thumb);
}

*::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}

*::-webkit-scrollbar-corner {
  background: transparent;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px) 0 0 / 38px 38px,
    linear-gradient(var(--grid-line-strong) 1px, transparent 1px) 0 0 / 38px 38px,
    radial-gradient(circle at 10% 0%, var(--accent-wash), transparent 34rem),
    var(--paper);
  color: var(--ink);
  font-family: "IBM Plex Sans", sans-serif;
}

a {
  color: inherit;
}

button,
input,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 5;
  background: var(--ink);
  color: var(--panel);
  padding: 0.75rem 1rem;
}

.skip-link:focus {
  top: 1rem;
}

.eyebrow {
  margin: 0 0 0.6rem;
  color: var(--accent-dark);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.login-shell {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 1.25rem;
}

.login-panel {
  width: min(31rem, 100%);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-strong);
  box-shadow: var(--shadow);
  padding: clamp(1.5rem, 6vw, 3rem);
}

.login-panel h1,
.app-header h1,
.dossier-hero h2 {
  font-family: "Instrument Serif", serif;
  font-weight: 400;
  line-height: 0.95;
}

.login-panel h1 {
  margin: 0;
  font-size: clamp(3rem, 13vw, 5.7rem);
}

.login-copy {
  color: var(--muted);
  font-size: 1.06rem;
  line-height: 1.6;
}

.login-form {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.login-form label {
  display: grid;
  gap: 0.4rem;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.login-form input,
.chat-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--field);
  color: var(--ink);
  padding: 0.9rem 1rem;
}

.login-form button,
.completion-toggle,
.audit-link,
.chat-form button {
  border: 0;
  border-radius: 999px;
  background: var(--ink);
  color: var(--panel);
  font-weight: 700;
  padding: 0.86rem 1.1rem;
  text-decoration: none;
  transition: transform 160ms ease, background 160ms ease;
}

.login-form button:hover,
.completion-toggle:hover,
.audit-link:hover,
.chat-form button:hover {
  background: var(--accent-dark);
  transform: translateY(-1px);
}

.form-error {
  border-left: 4px solid var(--accent);
  background: rgba(183, 65, 31, 0.08);
  padding: 0.8rem 1rem;
}

.login-back {
  justify-self: start;
  margin-top: 0.15rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.app-header {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  padding: clamp(1.25rem, 4vw, 2.5rem);
  border-bottom: 1px solid var(--line);
}

.app-header h1 {
  max-width: 30ch;
  margin: 0;
  font-size: clamp(3rem, 4vw, 5rem);
}

.app-header p:not(.eyebrow) {
  max-width: 48rem;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.6;
}

.user-panel {
  align-self: start;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  white-space: nowrap;
}

.user-panel a {
  color: var(--muted);
  font-size: 0.92rem;
}

.theme-toggle {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel-soft);
  color: var(--accent-dark);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 0.48rem 0.78rem;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(16rem, 22%) minmax(0, 1fr);
  min-height: calc(100vh - 14rem);
}

.persona-menu-toggle,
.persona-drawer-backdrop,
.persona-sidebar-heading {
  display: none;
}

.persona-sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow: auto;
  border-right: 1px solid var(--line);
  background: var(--sidebar-bg);
  padding: 0.65rem;
}

.progress-block {
  border-bottom: 1px solid var(--line);
  margin-bottom: 0.55rem;
  padding: 0.25rem 0.25rem 0.75rem;
}

.progress-label,
.tab-status,
.completion-state {
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
}

.progress-block strong {
  display: block;
  margin: 0.2rem 0 0.45rem;
  font-size: 1.35rem;
}

.progress-track {
  height: 0.45rem;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(23, 19, 15, 0.12);
}

.progress-track span {
  display: block;
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: var(--accent);
  transition: width 220ms ease;
}

.persona-tabs {
  display: grid;
  gap: 0.25rem;
}

.persona-tab {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 0.35rem 0.5rem;
  align-items: start;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0.52rem;
  text-decoration: none;
}

.persona-tab:hover,
.persona-tab.is-active {
  border-color: var(--line);
  background: var(--panel-medium);
}

.persona-tab.is-complete .tab-status {
  color: var(--green);
}

.persona-tab small {
  display: block;
  margin-top: 0.08rem;
  color: var(--muted);
  font-size: 0.7rem;
}

.tab-index {
  color: var(--accent-dark);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
  font-weight: 700;
}

.tab-status {
  justify-self: end;
  align-self: start;
  padding-top: 0.12rem;
  font-size: 0.64rem;
}

.persona-workspace {
  min-width: 0;
  padding: clamp(1rem, 3vw, 2.4rem);
}

.persona-dossier {
  animation: rise 360ms ease both;
}

.dossier-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(16rem, 20rem);
  gap: 1rem;
  align-items: end;
  border-bottom: 1px solid var(--line);
  padding-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.dossier-hero h2 {
  margin: 0;
  font-size: clamp(3rem, 4vw, 5rem);
}

.dossier-hero p:not(.eyebrow) {
  max-width: 60rem;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.24rem);
  line-height: 1.6;
}

.completion-card {
  display: grid;
  gap: 0.7rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-medium);
  padding: 1rem;
}

.completion-state.is-complete {
  color: var(--green);
}

.audit-link {
  display: inline-flex;
  justify-content: center;
  background: var(--accent);
}

.dossier-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(24rem, 30rem);
  gap: clamp(1.25rem, 3vw, 2.25rem);
  padding-top: clamp(1.5rem, 4vw, 2.5rem);
}

.dossier-main {
  display: grid;
  gap: 1.25rem;
  min-width: 0;
}

.quick-rail {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-medium);
  padding: clamp(0.8rem, 2vw, 1rem);
}

.quick-rail dl {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8.25rem, 1fr));
  gap: 0.6rem;
  margin: 0;
}

.quick-rail dl > div {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--tile-soft);
  padding: 0.68rem 0.72rem;
}

.quick-rail dt {
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  text-transform: uppercase;
}

.quick-rail dd {
  margin: 0.16rem 0 0;
  font-weight: 700;
  line-height: 1.22;
  overflow-wrap: anywhere;
}

.stat-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0.75rem 0 0;
}

.stat-list span {
  max-width: 100%;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel-soft);
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.25;
  overflow-wrap: anywhere;
  padding: 0.38rem 0.58rem;
}

.persona-content {
  display: grid;
  gap: 1.25rem;
}

.source-persona {
  display: grid;
  gap: 1rem;
}

.source-persona > p {
  margin: 0;
  color: var(--body-copy);
  font-size: 1.02rem;
  line-height: 1.68;
}

.content-section {
  border-top: 1px solid var(--line);
  padding-top: 1.1rem;
}

.content-section h3,
.chat-panel h3 {
  margin: 0 0 0.7rem;
  font-size: clamp(1.3rem, 2vw, 2rem);
}

.content-section p {
  margin: 0;
  color: var(--body-copy);
  line-height: 1.68;
}

.content-section ul,
.source-persona > ul {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding-left: 1.1rem;
}

.content-section li,
.source-persona > ul li {
  color: var(--body-copy);
  line-height: 1.62;
}

blockquote {
  margin: 0;
  border-left: 5px solid var(--accent);
  background: var(--panel-medium);
  color: var(--ink);
  font-family: "Instrument Serif", serif;
  font-size: clamp(1.55rem, 3vw, 2.5rem);
  line-height: 1.15;
  padding: 1rem 1.2rem;
}

.dossier-pager {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid var(--line);
  padding-top: 1rem;
}

.dossier-pager a {
  color: var(--accent-dark);
  font-weight: 700;
  text-decoration: none;
}

.chat-panel {
  position: sticky;
  top: 1rem;
  align-self: start;
  max-height: calc(100vh - 2rem);
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-medium);
  padding: clamp(1rem, 3vw, 1.5rem);
}

.chat-heading {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.chat-heading p:not(.eyebrow) {
  margin: 0.2rem 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.chat-heading button {
  align-self: start;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--field);
  color: var(--accent-dark);
  font-weight: 700;
  padding: 0.7rem 1rem;
  font-size: 0.82rem;
  text-transform: uppercase;
}

.chat-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 1rem;
}

.chat-thread-list {
  display: flex;
  gap: 0.45rem;
  overflow-x: auto;
  padding-bottom: 0.2rem;
}

.chat-thread-list p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.5;
}

.chat-thread-card {
  flex: 0 0 10.5rem;
  position: relative;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--tile-soft);
  overflow: visible;
}

.chat-thread-card > button {
  width: 100%;
  min-height: 5.5rem;
  border: 0;
  background: transparent;
  color: var(--ink);
  padding: 0.7rem 2.35rem 0.7rem 0.7rem;
  text-align: left;
}

.chat-thread-card:hover,
.chat-thread-card.is-active {
  border-color: rgba(183, 65, 31, 0.42);
  background: var(--accent-wash);
}

.chat-thread-menu {
  padding: 0 0.55rem 0.55rem;
}

.chat-thread-menu summary {
  position: absolute;
  top: 0.35rem;
  right: 0.35rem;
  display: grid;
  width: 1.75rem;
  height: 1.75rem;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--field);
  color: transparent;
  list-style: none;
  cursor: pointer;
}

.chat-thread-menu summary::-webkit-details-marker {
  display: none;
}

.chat-thread-menu summary::before {
  content: "...";
  color: var(--accent-dark);
  font-weight: 700;
  line-height: 1;
  transform: translateX(-0.28rem);
}

.chat-thread-menu div {
  display: grid;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--field);
}

.chat-thread-menu button {
  border: 0;
  background: transparent;
  color: var(--ink);
  padding: 0.65rem 0.75rem;
  text-align: left;
}

.chat-thread-menu button:hover {
  background: var(--panel-soft);
}

.chat-thread-menu [data-archive-thread] {
  color: var(--danger);
}

.chat-thread-list strong,
.chat-thread-list span {
  display: block;
}

.chat-thread-list strong {
  font-size: 0.92rem;
  max-width: 15ch;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
}

.chat-thread-list span {
  max-width: 15ch;
  overflow: hidden;
  margin-top: 0.2rem;
  color: var(--muted);
  font-size: 0.78rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chat-messages {
  display: grid;
  gap: 0.7rem;
  margin: 1rem 0;
}

.chat-note { color: var(--muted); font-size: 0.72rem; font-style: italic; }
.chat-empty { color: var(--muted); font-size: 0.92rem; }

.chat-message {
  max-width: 92%;
  border-radius: 8px;
  background: var(--message-bg);
  padding: 0.8rem 0.95rem;
}

.chat-message.user {
  justify-self: end;
  background: var(--accent-wash);
}

.chat-message span {
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  text-transform: uppercase;
}

.chat-message-body {
  display: grid;
  gap: 0.5rem;
  margin-top: 0.25rem;
  line-height: 1.55;
}

.chat-message-body > * {
  margin: 0;
}

.chat-message-body ul,
.chat-message-body ol {
  display: grid;
  gap: 0.28rem;
  padding-left: 1.15rem;
}

.chat-message-body blockquote {
  border-left-width: 3px;
  background: rgba(127, 111, 93, 0.1);
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  padding: 0.6rem 0.75rem;
}

.chat-message-body pre {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--field);
  padding: 0.75rem;
}

.chat-message-body code {
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--field);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.86em;
  padding: 0.08rem 0.28rem;
}

.chat-message-body pre code {
  border: 0;
  background: transparent;
  padding: 0;
}

.chat-message-body a {
  color: var(--accent-dark);
  font-weight: 700;
}

.chat-message > p {
  margin: 0.25rem 0 0;
  line-height: 1.55;
}

.chat-form label {
  display: block;
  margin-bottom: 0.45rem;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.chat-form > div {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.7rem;
  align-items: end;
}

.chat-form textarea {
  resize: vertical;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(0.5rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1380px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .persona-menu-toggle {
    position: sticky;
    top: 0.75rem;
    z-index: 6;
    display: inline-flex;
    width: max-content;
    margin: 0.75rem 0 0 0.75rem;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--ink);
    color: var(--panel);
    font-weight: 700;
    padding: 0.72rem 1rem;
  }

  .persona-drawer-backdrop {
    position: fixed;
    inset: 0;
    z-index: 8;
    display: block;
    background: rgba(23, 19, 15, 0.36);
    opacity: 0;
    pointer-events: none;
    transition: opacity 180ms ease;
  }

  .persona-sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 9;
    width: min(22rem, 86vw);
    height: 100vh;
    border-right: 1px solid var(--line);
    border-bottom: 0;
    box-shadow: var(--shadow);
    transform: translateX(-105%);
    transition: transform 220ms ease;
  }

  .app-shell.is-menu-open .persona-sidebar {
    transform: translateX(0);
    background: var(--paper);
  }

  .app-shell.is-menu-open .persona-drawer-backdrop {
    opacity: 1;
    pointer-events: auto;
  }

  .persona-sidebar-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--line);
    margin-bottom: 0.75rem;
    padding: 0.2rem 0.2rem 0.75rem;
    font-weight: 700;
  }

  .persona-sidebar-heading button {
    border: 0;
    background: transparent;
    color: var(--accent-dark);
    font-weight: 700;
  }
}

@media (max-width: 1100px) {
  .dossier-grid {
    grid-template-columns: 1fr;
  }

  .chat-panel {
    position: static;
    max-height: none;
  }
}

@media (max-width: 980px) {
  .dossier-hero {
    grid-template-columns: 1fr;
  }

  .quick-rail,
  .chat-panel {
    position: static;
    max-height: none;
  }

  .quick-rail dl {
    grid-template-columns: repeat(auto-fit, minmax(9.25rem, 1fr));
  }
}

@media (max-width: 640px) {
  .app-header,
  .chat-form > div,
  .chat-layout,
  .dossier-pager {
    display: grid;
  }

  .app-header {
    padding: 1rem;
  }

  .user-panel {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
  }

  .persona-workspace {
    padding: 1rem;
  }

  .dossier-hero h2 {
    font-size: 3rem;
  }
}