:root {
  --bg: #070707;
  --line: #1f1f1f;
  --line-strong: #2f2f2f;
  --text: #f6f6f6;
  --muted: #8a8a8a;
  --ok: #58d799;
  --warn: #f0b760;
  --danger: #ff7e94;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  color: var(--text);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
}

body {
  overflow: hidden;
}

.shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 12px;
  height: 100vh;
  padding: 20px 20px;
}

.sidebar {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: transparent;
  border: none;
  border-right: 1px solid var(--line);
  border-radius: 0;
  margin-bottom: 0;
}

.sidebar-head {
  padding: 14px;
  border-bottom: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.brand-block {
  min-width: 0;
}

.brand-title {
  margin: 0;
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.sidebar-actions {
  display: flex;
  gap: 6px;
}

.sidebar-actions .ghost-btn {
  padding: 8px 10px;
}

.tasks-list {
  padding: 10px;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
  min-height: 0;
}

.task-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px;
  background: #0d0d0d;
  cursor: pointer;
  transition: border-color 120ms ease, background 120ms ease;
}

.task-item:hover {
  border-color: var(--line-strong);
}

.task-item.active {
  border-color: #3a3a3a;
  background: #131313;
}

.task-line {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 0.74rem;
  color: var(--muted);
  margin-bottom: 5px;
}

.task-objective {
  font-size: 0.84rem;
  line-height: 1.3;
  max-height: 3.8em;
  overflow: hidden;
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 5px;
}

.status-pending,
.status-in_progress {
  background: var(--warn);
}

.status-completed {
  background: var(--ok);
}

.status-blocked,
.status-failed {
  background: var(--danger);
}

.main-panel {
  background: transparent;
  border: none;
  border-radius: 16px;
  padding: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 100%;
  overflow: hidden;
  min-width: 0;
  min-height: 0;
}

body.expanded .main-panel {
  background: transparent;
  border: none;
  justify-content: flex-start;
  padding: 0;
}

.main-head {
  display: none;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding-bottom: 8px;
}

body.expanded .main-head {
  display: none;
}

.product-title {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 600;
  color: #f1f1f1;
}

.task-context {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.2;
  max-width: 70ch;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.workspace {
  margin-top: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  align-items: center;
  flex: 0 1 auto;
  height: auto;
  min-height: auto;
  overflow: hidden;
}

body.expanded .workspace {
  grid-template-columns: 1fr;
  align-items: stretch;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  padding-top: 22px;
  padding-bottom: 20px;
}

body.expanded .workspace.report-open {
  grid-template-columns: minmax(0, 2fr) minmax(0, 3fr);
}

.chat-panel {
  border: none;
  border-radius: 18px;
  background: transparent;
  display: flex;
  flex-direction: column;
  height: auto;
  min-height: auto;
  overflow: hidden;
  min-width: 0;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
}

body.expanded .chat-panel {
  border: none;
  border-radius: 18px;
  background: transparent;
  height: 100%;
  max-width: none;
  margin: 0;
}

.report-panel {
  border: 1px solid #2f3237;
  border-radius: 18px;
  background: linear-gradient(180deg, #111112 0%, #0f0f10 100%);
  height: 100%;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow:
    0 12px 30px rgba(0, 0, 0, 0.34),
    0 0 0 1px rgba(255, 255, 255, 0.03) inset;
  transition:
    border-color 200ms ease,
    box-shadow 220ms ease,
    background 220ms ease;
}

body.expanded .workspace.report-open .report-panel {
  border-color: #3a4047;
  background: linear-gradient(180deg, #121315 0%, #101113 100%);
  box-shadow:
    0 18px 42px rgba(0, 0, 0, 0.42),
    0 0 0 1px rgba(196, 212, 230, 0.08) inset,
    0 0 30px rgba(122, 145, 171, 0.12);
}

.report-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 16px 36px;
  border-bottom: 1px solid #2d3137;
  background: linear-gradient(180deg, #151619 0%, #121315 100%);
}

.report-title {
  margin: 0;
  font-size: 0.98rem;
  font-weight: 600;
  text-transform: none;
  letter-spacing: 0;
  color: #e5e5e5;
  line-height: 1.25;
  min-width: 0;
  flex: 1;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.report-status {
  margin: 14px 36px 0;
  border: 1px solid #2f2f2f;
  border-radius: 10px;
  background: #151515;
  color: #d8d8d8;
  padding: 10px 12px;
  font-size: 0.8rem;
}

.report-status.error {
  border-color: #4c232c;
  background: #1a0c10;
  color: #ffccd6;
}

.report-content {
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 44px 72px 48px;
}

.report-content > * {
  max-width: 780px;
  margin-left: auto;
  margin-right: auto;
}

.landing-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-bottom: 72px;
  padding-top: 20px;
  animation: rise 260ms ease both;
}

.landing-title {
  margin: 0 0 12px;
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 700;
  color: #f8f8f8;
}

.landing-subtitle {
  margin: 0 0 16px;
  font-size: clamp(1rem, 2.2vw, 1.25rem);
  font-weight: 450;
  color: #b8b8b8;
  line-height: 1.35;
  letter-spacing: 0.01em;
}

.landing-databases {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 4px;
}

.db-badge {
  display: inline-block;
  border: 1px solid #2a2a2a;
  border-radius: 999px;
  padding: 5px 14px;
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--muted);
  background: #0e0e0e;
}

.sidebar-footer {
  padding: 12px 14px;
  border-top: 1px solid var(--line);
  margin-top: auto;
}

.sidebar-about-link {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.15s;
}

.sidebar-about-link:hover {
  color: var(--text);
  letter-spacing: 0.02em;
}

body.expanded .landing-hero {
  display: none;
}

.messages {
  display: none;
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 14px 14px 14px 18px;
  flex-direction: column;
  gap: 10px;
}

body.expanded .messages {
  display: flex;
}

.activity-card {
  border: 1px solid #27495c;
  border-radius: 14px;
  background:
    radial-gradient(120% 120% at 10% 10%, rgba(52, 116, 165, 0.28) 0%, rgba(9, 18, 34, 0.85) 36%, rgba(8, 10, 18, 0.96) 100%),
    linear-gradient(145deg, rgba(20, 28, 44, 0.92), rgba(12, 14, 26, 0.98));
  box-shadow:
    0 0 0 1px rgba(97, 181, 222, 0.16) inset,
    0 0 18px rgba(40, 135, 205, 0.18),
    0 0 34px rgba(15, 86, 147, 0.2);
  margin: 4px 0 6px;
  padding: 11px 12px;
  cursor: pointer;
  width: 100%;
}

.messages .activity-card {
  align-self: stretch;
}

.activity-card.is-complete {
  border-color: #2f7a5f;
  box-shadow:
    0 0 0 1px rgba(104, 197, 155, 0.14) inset,
    0 0 16px rgba(44, 174, 123, 0.15);
}

.activity-card.is-error {
  border-color: #7e3c4f;
  box-shadow:
    0 0 0 1px rgba(198, 90, 116, 0.13) inset,
    0 0 16px rgba(175, 62, 94, 0.19);
}

.activity-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.activity-main {
  display: flex;
  align-items: center;
  gap: 10px;
}

.activity-wheel {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid rgba(92, 157, 196, 0.28);
  border-top-color: #72dbff;
  border-right-color: #7ef2cd;
  box-shadow:
    0 0 12px rgba(98, 195, 255, 0.3),
    0 0 20px rgba(72, 138, 226, 0.22);
  animation: spin 1000ms linear infinite;
  flex: 0 0 auto;
}

.activity-card.is-complete .activity-wheel {
  animation: none;
  border-color: #8cf7c2;
  border-top-color: #8cf7c2;
  border-right-color: #8cf7c2;
  box-shadow: 0 0 14px rgba(95, 212, 160, 0.28);
}

.activity-card.is-error .activity-wheel {
  animation: spin 1300ms linear infinite;
  border-color: rgba(180, 86, 111, 0.45);
  border-top-color: #ff8ca6;
  border-right-color: #f89bb2;
  box-shadow: 0 0 14px rgba(197, 71, 104, 0.28);
}

.activity-card.is-paused .activity-wheel {
  animation: none;
}

.activity-title-stack {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.activity-title {
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  color: #eaf3ff;
  font-weight: 620;
  line-height: 1.25;
}

.activity-summary {
  font-size: 0.8rem;
  color: #cad8e8;
  line-height: 1.34;
}

.activity-preview {
  font-size: 0.76rem;
  color: #b8c8df;
  line-height: 1.4;
  max-height: 2.8em;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 7px;
}

.activity-details {
  margin: 8px 0 0;
  padding: 8px;
  border-radius: 8px;
  border: 1px solid #22364a;
  background: rgba(9, 12, 22, 0.82);
  color: #dbe6f3;
  font: 500 0.76rem/1.45 Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  white-space: normal;
  max-height: 420px;
  overflow: auto;
}

.activity-card.expanded .activity-preview {
  max-height: none;
  overflow: visible;
}

.activity-card.expanded .activity-details {
  cursor: text;
  -webkit-user-select: text;
  user-select: text;
}

.message {
  max-width: 92%;
  padding: 6px 0;
  animation: rise 180ms ease both;
}

.message.user {
  align-self: flex-end;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #1a1a1a;
  padding: 10px 12px;
}

.message.assistant {
  align-self: flex-start;
  max-width: 100%;
  border: none;
  border-radius: 0;
  background: transparent;
  padding: 2px 0;
}

.message.system {
  align-self: flex-start;
  max-width: 100%;
  border: none;
  border-radius: 0;
  background: transparent;
  padding: 2px 0;
}

.checkpoint-start-btn {
  margin-top: 8px;
}

.report-card {
  border: 1px solid #2c3442 !important;
  border-radius: 12px !important;
  background: linear-gradient(145deg, rgba(24, 28, 40, 0.94), rgba(14, 17, 26, 0.96)) !important;
  box-shadow:
    0 0 0 1px rgba(135, 162, 198, 0.08) inset,
    0 12px 26px rgba(0, 0, 0, 0.24);
  padding: 10px 12px !important;
  cursor: pointer;
  margin: 2px 0 4px;
}

.report-card.active {
  border-color: #5f7ea0 !important;
  box-shadow:
    0 0 0 1px rgba(146, 190, 234, 0.22) inset,
    0 0 18px rgba(84, 130, 183, 0.25);
}

.report-card-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  font-size: 0.76rem;
  color: #b8c7d9;
}

.report-card-title {
  margin-top: 6px;
  color: #e7eef8;
  font-size: 0.86rem;
  line-height: 1.35;
}

.branch-badge {
  display: inline-block;
  margin-top: 8px;
  border: 1px solid #35516d;
  border-radius: 999px;
  padding: 3px 9px;
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: #b6cee8;
  background: rgba(34, 58, 86, 0.55);
}

.message-head {
  font-size: 0.73rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 6px;
}

.message-body {
  margin: 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
  font-size: 0.88rem;
  line-height: 1.42;
  color: #f0f0f0;
  font-family: inherit;
}

.markdown-body {
  white-space: normal;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
  margin: 0.5em 0 0.35em;
  line-height: 1.25;
}

.markdown-body h1 {
  font-size: 1.15rem;
}

.markdown-body h2 {
  font-size: 1.03rem;
}

.markdown-body h3 {
  font-size: 0.96rem;
}

.markdown-body p {
  margin: 0.28em 0;
}

.markdown-body ul,
.markdown-body ol {
  margin: 0.32em 0;
  padding-left: 1.25em;
}

.markdown-body li {
  margin: 0.2em 0;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.markdown-body li::marker {
  color: inherit;
  font-weight: 400;
}

.checkpoint-message .markdown-body h3 {
  margin-top: 0.65em;
  margin-bottom: 0.3em;
  padding-left: 0;
  border-left: none;
  color: #ebf2ff;
}

.checkpoint-message .plan-steps {
  margin: 0.7em 0 0.4em;
  padding-left: 1.4em;
  list-style: decimal;
}

.checkpoint-message .plan-steps > li {
  margin: 0.85em 0;
  padding-left: 0.2em;
  line-height: 1.45;
}

.plan-step-title {
  display: block;
  font-weight: 600;
  color: #e8f0fb;
  font-size: 0.9rem;
}

.plan-step-details {
  margin: 0.35em 0 0 0.15em !important;
  padding-left: 0.75em !important;
  list-style: none !important;
  border-left: 2px solid #2d3d52;
}

.plan-step-details > li {
  margin: 0.22em 0 !important;
  font-size: 0.83rem;
  color: #a8b8cc;
  line-height: 1.4;
}

.plan-step-label {
  font-weight: 500;
  color: #6b8aaa;
  margin-right: 0.35em;
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
}

/* In activity logs, visually nest bullet details under numbered workflow steps. */
.activity-details ol + ul {
  margin-left: 0.95rem;
  padding-left: 1.35em;
  border-left: none;
}

.markdown-body blockquote {
  margin: 0.4em 0;
  padding-left: 0.8em;
  border-left: 2px solid #2f2f2f;
  color: #cfcfcf;
}

.markdown-body blockquote p {
  margin: 0.15em 0;
}

.markdown-body hr {
  border: none;
  border-top: 1px solid #2f3237;
  margin: 0.6em 0;
}

.markdown-body code {
  background: #1e1e1e;
  border: 1px solid #2b2b2b;
  border-radius: 6px;
  padding: 0.08em 0.28em;
  font-size: 0.86em;
}

.markdown-body pre {
  margin: 0.4em 0;
  padding: 0.55em 0.65em;
  border: 1px solid #2a2a2a;
  border-radius: 8px;
  background: #121212;
  overflow: auto;
}

.markdown-body pre code {
  border: none;
  background: transparent;
  padding: 0;
}

.markdown-body a {
  color: #d8d8d8;
  text-decoration: underline;
}

.report-content.markdown-body {
  font-size: 1rem;
  line-height: 1.72;
  color: #f1f1f1;
}

.report-content.markdown-body h1,
.report-content.markdown-body h2,
.report-content.markdown-body h3 {
  line-height: 1.28;
  letter-spacing: 0;
  margin-top: 1.5em;
  margin-bottom: 0.55em;
}

.report-content.markdown-body > h1:first-child,
.report-content.markdown-body > h2:first-child,
.report-content.markdown-body > h3:first-child {
  margin-top: 0;
}

.report-content.markdown-body h1 {
  font-size: 1.34rem;
}

.report-content.markdown-body h2 {
  font-size: 1.18rem;
}

.report-content.markdown-body h3 {
  font-size: 1.06rem;
}

.report-content.markdown-body p {
  margin: 0.74em 0;
}

.report-content.markdown-body ul,
.report-content.markdown-body ol {
  margin: 0.72em 0 0.9em;
  padding-left: 1.4em;
}

.report-content.markdown-body li {
  margin: 0.34em 0;
}

.report-content.markdown-body blockquote {
  margin: 0.9em 0;
  padding: 0.18em 0 0.18em 0.95em;
}

.report-content.markdown-body blockquote p {
  margin: 0.25em 0;
}

.report-content.markdown-body hr {
  border: none;
  border-top: 1px solid #2f3237;
  margin: 1.3em 0;
}

.report-content.markdown-body pre {
  margin: 0.95em 0;
  padding: 0.85em 0.95em;
}

.composer {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #141414;
  position: relative;
  padding: 10px 52px 36px 10px;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  gap: 0;
}

body.expanded .composer {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #141414;
}

.example-queries {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 12px;
  animation: rise 320ms ease both;
}

body.expanded .example-queries {
  display: none;
}

.example-query {
  border: 1px solid #2a2a2a;
  border-radius: 10px;
  padding: 8px 13px;
  font-size: 0.78rem;
  line-height: 1.35;
  color: #6b6b6b;
  background: #0e0e0e;
  cursor: pointer;
  transition: border-color 150ms ease, color 150ms ease, background 150ms ease;
  max-width: 100%;
}

.example-query:hover {
  border-color: #3a3a3a;
  color: #a0a0a0;
  background: #141414;
}

#promptInput {
  width: 100%;
  border-radius: 0;
  border: none;
  resize: none;
  min-height: 72px;
  max-height: 210px;
  padding: 0;
  font: 500 0.92rem/1.4 Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: transparent;
  color: #f3f3f3;
}

#promptInput::placeholder {
  color: #707070;
}

#promptInput:focus {
  outline: none;
}

.primary-btn,
.ghost-btn {
  border-radius: 10px;
  border: 1px solid var(--line-strong);
  font: 600 0.82rem/1 Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  padding: 9px 12px;
  cursor: pointer;
  background: #131313;
  color: #efefef;
}

.primary-btn {
  background: #f2f2f2;
  color: #0b0b0b;
  border-color: #f2f2f2;
}

.primary-btn:disabled,
.ghost-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.muted {
  margin: 0;
  font-size: 0.82rem;
  color: var(--muted);
}

.notice {
  margin: 6px 0 8px;
  padding: 9px 10px;
  border-radius: 10px;
  border: 1px solid #3a3a3a;
  background: #121212;
  color: #f1f1f1;
  font-size: 0.83rem;
  white-space: pre-wrap;
}

.hidden {
  display: none !important;
}

.send-btn {
  width: 38px;
  height: 38px;
  padding: 0;
  border-radius: 999px;
  font-size: 0.95rem;
  line-height: 1;
  position: absolute;
  right: 8px;
  bottom: 8px;
}

.tasks-list,
.messages,
.activity-details,
.report-content {
  scrollbar-width: thin;
  scrollbar-color: transparent transparent;
}

.tasks-list::-webkit-scrollbar,
.messages::-webkit-scrollbar,
.activity-details::-webkit-scrollbar,
.report-content::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

.tasks-list::-webkit-scrollbar-track,
.messages::-webkit-scrollbar-track,
.activity-details::-webkit-scrollbar-track,
.report-content::-webkit-scrollbar-track {
  background: transparent;
}

.tasks-list::-webkit-scrollbar-thumb,
.messages::-webkit-scrollbar-thumb,
.activity-details::-webkit-scrollbar-thumb,
.report-content::-webkit-scrollbar-thumb {
  background: transparent;
  border-radius: 999px;
}

.tasks-list:hover,
.messages:hover,
.activity-details:hover,
.report-content:hover {
  scrollbar-color: #353535 transparent;
}

.tasks-list:hover::-webkit-scrollbar-thumb,
.messages:hover::-webkit-scrollbar-thumb,
.activity-details:hover::-webkit-scrollbar-thumb,
.report-content:hover::-webkit-scrollbar-thumb {
  background: #353535;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes fade-line {
  to {
    opacity: 0.82;
  }
}


@media (max-width: 980px) {
  body {
    overflow: auto;
  }

  .shell {
    grid-template-columns: 1fr;
    height: auto;
    min-height: 100vh;
  }

  .sidebar {
    max-height: 27vh;
  }

  .workspace,
  body.expanded .workspace {
    grid-template-columns: 1fr;
  }

  body.expanded .workspace.report-open {
    grid-template-columns: 1fr;
  }

  .chat-panel {
    margin: auto;
  }

  .report-panel {
    max-height: 56vh;
  }

  .report-content {
    padding: 24px 22px 26px;
  }
}

/* ── About page ─────────────────────────────────────────────────────────── */

.about-body {
  overflow: auto;
}

.about-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 24px 60px;
}

.about-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 48px;
}

.about-back {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: 6px 12px;
  transition: color 0.15s, border-color 0.15s;
}

.about-back:hover {
  color: var(--text);
  border-color: var(--text);
}

.about-brand {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.about-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}

.about-intro {
  margin-bottom: 48px;
}

.about-intro p {
  font-size: 1rem;
  line-height: 1.65;
  color: #c8c8c8;
  margin: 0 0 12px;
}

.about-intro em {
  color: var(--text);
  font-style: italic;
}

.about-sources-intro {
  font-size: 0.92rem;
  color: var(--muted);
  margin: 0 0 32px;
}

.tier {
  margin-bottom: 36px;
}

.tier h3 {
  font-size: 1.1rem;
  font-weight: 650;
  margin: 0 0 4px;
  color: var(--text);
}

.tier-desc {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0 0 16px;
}

.source-list {
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.source-item {
  background: #0e0e0e;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 18px;
}

.source-item dt {
  font-size: 0.9rem;
  font-weight: 600;
  margin: 0 0 4px;
  color: var(--text);
}

.source-item dt a {
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,0.2);
  transition: border-color 0.15s, color 0.15s;
}

.source-item dt a:hover {
  color: var(--accent, #60a5fa);
  border-bottom-color: var(--accent, #60a5fa);
}

.source-item dd {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.55;
  color: var(--muted);
}

.about-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.about-footer p {
  font-size: 0.82rem;
  color: var(--muted);
  margin: 0;
}

@media (max-width: 600px) {
  .about-page {
    padding: 24px 16px 40px;
  }

  .about-content h2 {
    font-size: 1.25rem;
  }

  .tier h3 {
    font-size: 1rem;
  }
}