:root {
  --ink: #10211f;
  --ink-soft: #2e4743;
  --paper: #eef3ef;
  --paper-deep: #dce6df;
  --stone: #cbd4ce;
  --silver: #aebbb5;
  --jade: #24786c;
  --jade-deep: #14594f;
  --amber: #bd813b;
  --danger: #a8433f;
  --white: #fbfdfb;
  --line: rgba(16, 33, 31, 0.18);
  --shadow: 0 24px 70px rgba(16, 33, 31, 0.16);
  --display: "Noto Serif CJK SC", "Source Han Serif SC", "STSong", "SimSun", serif;
  --sans: "Noto Sans CJK SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--paper);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.6;
  background:
    linear-gradient(132deg, rgba(36, 120, 108, 0.09), transparent 38%),
    radial-gradient(circle at 82% 10%, rgba(189, 129, 59, 0.11), transparent 28%),
    var(--paper);
}

button,
input,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

textarea,
input {
  width: 100%;
}

textarea,
input,
output {
  border: 1px solid var(--line);
  border-radius: 3px;
  background: rgba(251, 253, 251, 0.82);
  color: var(--ink);
}

input,
textarea {
  padding: 0.75rem 0.85rem;
}

textarea {
  resize: vertical;
}

input:focus,
textarea:focus,
button:focus-visible,
a:focus-visible {
  outline: 3px solid rgba(36, 120, 108, 0.3);
  outline-offset: 2px;
}

label {
  display: grid;
  gap: 0.35rem;
  color: var(--ink-soft);
  font-size: 0.88rem;
}

code,
output {
  display: block;
  overflow-wrap: anywhere;
  padding: 0.7rem;
  font-family: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.78rem;
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(16, 33, 31, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 33, 31, 0.028) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, black, transparent 88%);
}

.masthead {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  min-height: 78px;
  padding: 0.85rem clamp(1.1rem, 4vw, 3.5rem);
  border-bottom: 1px solid var(--line);
  background: rgba(238, 243, 239, 0.86);
  backdrop-filter: blur(14px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  width: 31px;
  height: 31px;
  border: 1px solid var(--jade);
  border-radius: 50% 48% 52% 46%;
  transform: rotate(-17deg);
}

.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  border-radius: 999px;
  background: var(--jade);
}

.brand-mark::before {
  width: 4px;
  height: 19px;
  left: 12px;
  top: 5px;
  transform: rotate(29deg);
}

.brand-mark::after {
  width: 13px;
  height: 1px;
  left: 8px;
  top: 15px;
}

.brand strong {
  display: block;
  font-family: var(--display);
  font-size: 1.08rem;
  letter-spacing: 0.08em;
}

.brand small {
  display: block;
  color: var(--ink-soft);
  font-size: 0.72rem;
  letter-spacing: 0.13em;
}

.session-strip {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.connection-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--silver);
  box-shadow: 0 0 0 4px rgba(174, 187, 181, 0.18);
}

.connection-dot.online {
  background: var(--jade);
  box-shadow: 0 0 0 4px rgba(36, 120, 108, 0.16);
}

.gate-view {
  width: min(1380px, calc(100% - 2rem));
  min-height: calc(100vh - 78px);
  margin: 0 auto;
  padding: clamp(2.2rem, 5vw, 5rem) 0;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(340px, 0.8fr);
  gap: clamp(2rem, 6vw, 7rem);
  align-items: center;
}

.gate-intro {
  max-width: 690px;
}

.kicker {
  margin: 0 0 0.45rem;
  color: var(--jade-deep);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.kicker:empty {
  display: none;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  font-family: var(--display);
  line-height: 1.23;
}

h1 {
  margin-bottom: 1.25rem;
  font-size: clamp(2.5rem, 5.1vw, 5.2rem);
  font-weight: 600;
  letter-spacing: -0.035em;
}

h2 {
  margin-bottom: 0.8rem;
  font-size: clamp(1.7rem, 2.5vw, 2.4rem);
}

h3 {
  margin-bottom: 0.6rem;
  font-size: 1.25rem;
}

.lead {
  max-width: 58ch;
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.4vw, 1.17rem);
}

.principles {
  margin: 2.1rem 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.principles li {
  display: grid;
  grid-template-columns: 2.2rem 1fr;
  gap: 1rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--line);
}

.principles span {
  color: var(--amber);
  font-family: "Cascadia Mono", monospace;
  font-size: 0.78rem;
}

.principles p {
  margin: 0;
}

.gate-card {
  position: relative;
  padding: clamp(1.25rem, 3vw, 2.4rem);
  border: 1px solid rgba(16, 33, 31, 0.25);
  border-radius: 5px 32px 5px 32px;
  background: rgba(251, 253, 251, 0.92);
  box-shadow: var(--shadow);
}

.secure-context-warning {
  margin-bottom: 1rem;
  padding: 0.9rem 1rem;
  border: 1px solid #c99658;
  border-radius: 0.65rem;
  background: #fff7e9;
  color: #5d3c16;
}

.secure-context-warning strong {
  display: block;
  margin-bottom: 0.25rem;
}

.secure-context-warning p {
  margin: 0;
  line-height: 1.55;
}

.gate-card::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(36, 120, 108, 0.12);
  border-radius: 2px 25px 2px 25px;
  pointer-events: none;
}

.stack {
  display: grid;
  gap: 1rem;
}

.form-grid {
  display: grid;
  gap: 0.9rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.primary,
.secondary,
.quiet-button,
.icon-button {
  border: 0;
  border-radius: 3px;
  transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}

.primary {
  padding: 0.82rem 1.15rem;
  background: var(--jade-deep);
  color: var(--white);
  font-weight: 700;
}

.primary:hover {
  background: var(--jade);
}

.secondary {
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
}

.secondary:hover {
  background: var(--paper-deep);
}

.quiet-button {
  align-self: end;
  padding: 0.6rem;
  background: transparent;
  color: var(--ink-soft);
  text-align: left;
}

.icon-button {
  width: 2.45rem;
  height: 2.45rem;
  border: 1px solid var(--line);
  background: rgba(251, 253, 251, 0.65);
  color: var(--ink);
  font-size: 1.15rem;
}

.tab-list {
  display: flex;
  gap: 0.3rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.tab {
  padding: 0.7rem 0.8rem;
  border: 0;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--ink-soft);
}

.tab.active {
  border-bottom-color: var(--jade);
  color: var(--ink);
  font-weight: 700;
}

.secret-result {
  padding: 1rem;
  border-left: 3px solid var(--amber);
  background: rgba(189, 129, 59, 0.08);
}

.device-step {
  display: grid;
  gap: 0.75rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--line);
}

.step-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

.step-head strong {
  color: var(--amber);
  font-family: "Cascadia Mono", monospace;
  font-size: 0.76rem;
}

.muted {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.workspace {
  width: min(1440px, calc(100% - 1.5rem));
  min-height: calc(100vh - 100px);
  margin: 0 auto;
  padding: 1rem 0 2rem;
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: 1rem;
}

.rail,
.workbench {
  border: 1px solid var(--line);
  background: rgba(251, 253, 251, 0.82);
}

.rail {
  min-height: calc(100vh - 116px);
  padding: 1rem;
  border-radius: 4px 22px 4px 22px;
  display: flex;
  flex-direction: column;
}

.rail-title {
  padding: 0 0.45rem 1rem;
  border-bottom: 1px solid var(--line);
}

.rail-title strong {
  display: block;
  font-family: var(--display);
  font-size: 1.25rem;
}

.rail nav {
  display: grid;
  gap: 0.3rem;
  padding: 1rem 0;
}

.nav-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0.8rem;
  border: 0;
  border-left: 2px solid transparent;
  background: transparent;
  color: var(--ink-soft);
  text-align: left;
}

.nav-item small {
  min-width: 1.7rem;
  color: var(--ink-soft);
  font-family: "Cascadia Mono", monospace;
  text-align: right;
}

.nav-item.active {
  border-left-color: var(--jade);
  background: rgba(36, 120, 108, 0.08);
  color: var(--ink);
  font-weight: 700;
}

.workbench {
  min-width: 0;
  padding: clamp(1rem, 2vw, 1.6rem);
  border-radius: 22px 4px 22px 4px;
}

.workbench-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.workbench-head h2 {
  margin: 0;
  font-size: clamp(1.7rem, 3vw, 2.6rem);
}

.view-panel {
  padding-top: 1.2rem;
}

.message-list,
.data-list,
.audit-list {
  display: grid;
  gap: 0.65rem;
}

.archive-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 0.75rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.archive-toolbar label {
  flex: 1 1 260px;
}

.archive-group {
  border: 1px solid var(--line);
  background: rgba(251, 253, 251, 0.72);
}

.archive-group summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1rem;
  cursor: pointer;
  list-style: none;
}

.archive-group summary::-webkit-details-marker {
  display: none;
}

.archive-group summary::before {
  content: "＋";
  color: var(--jade);
  font-family: "Cascadia Mono", monospace;
}

.archive-group[open] summary::before {
  content: "−";
}

.archive-heading {
  display: flex;
  flex: 1;
  align-items: baseline;
  gap: 0.65rem;
}

.archive-heading strong {
  font-family: var(--display);
  font-size: 1.03rem;
}

.archive-heading small,
.archive-meta {
  color: var(--ink-soft);
  font-size: 0.76rem;
}

.archive-body {
  display: grid;
  gap: 0.65rem;
  padding: 0 1rem 1rem 2.2rem;
}

.message {
  max-width: none;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--jade);
  border-radius: 2px;
  background: var(--white);
}

.message > p {
  max-width: 78ch;
  margin-bottom: 0;
}

.message.mine {
  justify-self: stretch;
  border-radius: 2px;
  background: rgba(36, 120, 108, 0.05);
}

.message-meta,
.data-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.8rem;
  margin-top: 0.6rem;
  color: var(--ink-soft);
  font-size: 0.76rem;
}

.state {
  color: var(--jade-deep);
  font-family: "Cascadia Mono", monospace;
}

.state.ACKED,
.state.ACKNOWLEDGED,
.state.DONE {
  color: var(--jade);
}

.state.BLOCKED,
.state.UNKNOWN {
  color: var(--danger);
}

.composer,
.inline-form {
  display: grid;
  gap: 0.75rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.composer {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
}

.section-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.section-row .muted {
  margin-right: auto;
}

.file-picker {
  width: auto;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--white);
}

.file-picker input {
  max-width: 15rem;
  padding: 0;
  border: 0;
  background: transparent;
}

.data-item,
.audit-item {
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  background: var(--white);
}

.data-title {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.6rem;
}

.data-title strong {
  font-family: var(--display);
  font-size: 1.05rem;
}

.split-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
  gap: 1rem;
  margin-bottom: 1.2rem;
}

.pending-card {
  min-height: 220px;
  padding: 1rem;
  border-left: 3px solid var(--amber);
  background: rgba(189, 129, 59, 0.08);
}

.pending-card dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.35rem 0.8rem;
  margin: 0 0 1rem;
}

.pending-card dt {
  color: var(--ink-soft);
}

.pending-card dd {
  overflow-wrap: anywhere;
  margin: 0;
  font-family: "Cascadia Mono", monospace;
  font-size: 0.78rem;
}

.checkbox-grid {
  display: grid;
  gap: 0.35rem;
  margin: 0.8rem 0;
}

.checkbox-grid label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.checkbox-grid input {
  width: auto;
}

.toast {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 20;
  width: min(420px, calc(100% - 2rem));
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--jade);
  background: var(--ink);
  color: var(--white);
  box-shadow: var(--shadow);
}

.toast.error {
  border-left-color: var(--danger);
}

.empty {
  padding: 2rem 1rem;
  border: 1px dashed var(--line);
  color: var(--ink-soft);
  text-align: center;
}

.site-filing {
  width: min(1380px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1rem 0 1.4rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.35rem 1.15rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.74rem;
}

.site-filing a {
  color: inherit;
  text-decoration: none;
}

.site-filing a:hover {
  color: var(--jade-deep);
  text-decoration: underline;
}

.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;
}

[hidden] {
  display: none !important;
}

@media (max-width: 900px) {
  .gate-view {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .gate-intro {
    max-width: none;
  }

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

  .rail {
    min-height: auto;
    border-radius: 4px 18px 4px 18px;
  }

  .rail nav {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0.2rem;
  }

  .nav-item {
    display: grid;
    gap: 0.2rem;
    justify-items: center;
    padding: 0.65rem 0.35rem;
    border-left: 0;
    border-bottom: 2px solid transparent;
    text-align: center;
  }

  .nav-item.active {
    border-bottom-color: var(--jade);
  }

  .split-panel {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .masthead {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-filing {
    width: calc(100% - 1rem);
    padding-bottom: 0.9rem;
  }

  .gate-view {
    width: min(100% - 1rem, 1380px);
    padding-top: 1.4rem;
  }

  h1 {
    font-size: clamp(2.2rem, 13vw, 3.5rem);
  }

  .gate-card {
    padding: 1.15rem;
  }

  .workspace {
    width: calc(100% - 0.7rem);
    padding-top: 0.35rem;
  }

  .rail {
    padding: 0.65rem;
  }

  .rail-title,
  #logout-button {
    display: none;
  }

  .rail nav {
    padding: 0;
  }

  .nav-item span {
    font-size: 0.78rem;
  }

  .workbench {
    padding: 0.9rem;
  }

  .message {
    max-width: 100%;
  }

  .composer {
    grid-template-columns: 1fr;
  }

  .archive-toolbar {
    align-items: stretch;
  }

  .archive-group summary {
    flex-wrap: wrap;
  }

  .archive-meta {
    width: 100%;
    padding-left: 1.5rem;
  }

  .archive-body {
    padding-left: 1rem;
  }

  .section-row {
    align-items: stretch;
  }

  .file-picker {
    width: 100%;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .gate-intro,
  .gate-card {
    animation: settle 540ms cubic-bezier(0.22, 1, 0.36, 1) both;
  }

  .gate-card {
    animation-delay: 90ms;
  }

  @keyframes settle {
    from {
      opacity: 0;
      transform: translateY(14px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}