:root {
  --bg: #f7f7f7;
  --panel: #ffffff;
  --text: #0a0a0a;
  --muted: #666666;
  --border: #d9d9d9;
  --soft: #eeeeee;
  --strong: #000000;
  --reverse: #ffffff;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

:root[data-theme='dark'] {
  --bg: #050505;
  --panel: #111111;
  --text: #f5f5f5;
  --muted: #aaaaaa;
  --border: #333333;
  --soft: #1d1d1d;
  --strong: #ffffff;
  --reverse: #000000;
  --shadow: 0 12px 40px rgba(255, 255, 255, 0.04);
}

* {
  box-sizing: border-box;
}

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

button,
input,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.58;
}

.page {
  min-height: 100vh;
  padding: 24px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.home-page {
  display: grid;
  place-items: center;
}

.hero-panel {
  width: min(860px, 100%);
  padding: 36px;
}

.topbar,
.room-title-row,
.chat-header,
.key-actions,
.alias-row,
.composer,
.home-actions,
.join-box {
  display: flex;
  align-items: center;
  gap: 12px;
}

.topbar,
.room-title-row,
.chat-header {
  justify-content: space-between;
}

.eyebrow {
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  line-height: 1.15;
}

h1 {
  font-size: clamp(30px, 5vw, 54px);
}

h2 {
  max-width: 100%;
  overflow-wrap: anywhere;
  font-size: 18px;
}

.hero-text {
  max-width: 660px;
  margin: 24px 0 30px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
}

.home-actions {
  align-items: stretch;
  flex-wrap: wrap;
}

.join-box {
  flex: 1;
  min-width: 320px;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--panel);
  color: var(--text);
  outline: none;
}

input {
  height: 44px;
  padding: 0 14px;
}

textarea {
  min-height: 44px;
  max-height: 220px;
  padding: 12px 14px;
  resize: none;
  line-height: 1.45;
}

input:focus,
textarea:focus {
  border-color: var(--strong);
}

.primary-btn,
.secondary-btn,
.ghost-btn,
.file-btn,
.message-actions button {
  height: 44px;
  border-radius: 14px;
  padding: 0 16px;
  border: 1px solid var(--strong);
  white-space: nowrap;
}

.primary-btn {
  background: var(--strong);
  color: var(--reverse);
}

.secondary-btn {
  background: var(--panel);
  color: var(--text);
}

.ghost-btn {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}

.primary-btn:hover,
.secondary-btn:hover,
.ghost-btn:hover,
.file-btn:hover,
.message-actions button:hover {
  filter: invert(0.08);
}

.tips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.tips span,
.badge {
  display: inline-flex;
  align-items: center;
  height: 28px;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0 10px;
  color: var(--muted);
  font-size: 13px;
}

.room-page {
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  gap: 18px;
}

.sidebar {
  position: sticky;
  top: 24px;
  height: calc(100vh - 48px);
  padding: 22px;
  overflow: auto;
}

.status-line {
  display: flex;
  align-items: center;
  gap: 6px;
  min-height: 42px;
  min-width: 0;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--soft);
  color: var(--text);
  font-size: 14px;
  font-weight: 700;
}

.room-status-row .status-line {
  margin-top: 0;
  flex: 1;
}

.room-status-row {
  margin-bottom: 18px;
  gap: 10px;
}

.status-text,
.status-sep {
  flex: 0 0 auto;
}

.status-self {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.dot {
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--border);
}

.dot.online {
  background: var(--strong);
}

.dot.connecting {
  background: transparent;
  border: 2px solid var(--strong);
}

.dot.reconnecting {
  background: transparent;
  border: 2px solid var(--strong);
}

.dot.offline {
  border: 2px solid var(--border);
  background: transparent;
}

.key-actions {
  margin: 18px 0 20px;
}

.field-label,
.section-title {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 13px;
}

.alias-row input {
  min-width: 0;
}

.member-block {
  margin-top: 24px;
}

.members {
  display: grid;
  gap: 8px;
}

.member {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 8px;
  overflow: hidden;
}

.member.self {
  border-color: var(--strong);
}

.member span:last-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chat {
  height: calc(100vh - 48px);
  overflow: auto;
  padding: 0 22px 22px;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto auto;
  transition: outline 0.15s ease;
}

.chat-header {
  position: sticky;
  top: 0;
  z-index: 10;
  margin: 0 -22px;
  padding: 22px 22px 14px;
  border-bottom: 1px solid var(--border);
  border-radius: 24px 24px 0 0;
  background: var(--panel);
}

.chat.dragging {
  outline: 2px dashed var(--strong);
  outline-offset: -12px;
}

.file-btn {
  display: inline-flex;
  align-items: center;
  background: var(--strong);
  color: var(--reverse);
}

.file-btn input {
  display: none;
}

.message-list {
  margin: 18px -4px 0;
  padding: 4px;
  overflow: auto;
}

.empty,
.muted {
  color: var(--muted);
}

.empty {
  display: grid;
  place-items: center;
  height: 100%;
  min-height: 260px;
  text-align: center;
  border: 1px dashed var(--border);
  border-radius: 18px;
  padding: 24px;
}

.message {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  width: fit-content;
  min-width: 92px;
  max-width: min(76%, 760px);
  margin: 14px 0;
}

.message.own {
  align-items: flex-end;
  margin-left: auto;
}

.message-meta {
  margin: 0 4px 6px;
  color: var(--muted);
  font-size: 12px;
}

.message.own .message-meta {
  text-align: right;
}

.bubble {
  display: inline-block;
  width: fit-content;
  min-width: 64px;
  max-width: 100%;
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 12px 14px;
  background: var(--soft);
}

.text-bubble {
  min-width: 48px;
}

.message.own .bubble {
  border-color: var(--strong);
  background: var(--panel);
}

.message.revoked .bubble {
  color: var(--muted);
  font-style: italic;
}

.message.pending .bubble {
  border-style: dashed;
}

.message.pending.sending .bubble {
  color: var(--muted);
}

.pending-error {
  margin: 5px 4px 0;
  color: var(--muted);
  font-size: 12px;
}

pre {
  display: inline;
  margin: 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
  font-family: inherit;
}

.image-link {
  display: block;
}

.image-link img {
  display: block;
  max-width: 100%;
  max-height: 360px;
  border-radius: 12px;
  object-fit: contain;
  border: 1px solid var(--border);
}

.file-meta {
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
}

.file-card {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 260px;
  max-width: 100%;
  color: inherit;
  text-decoration: none;
}

.file-icon {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border: 1px solid var(--border);
  border-radius: 14px;
  color: var(--muted);
  font-size: 12px;
}

.file-card strong,
.file-card small {
  display: block;
  word-break: break-all;
}

.file-card small {
  margin-top: 4px;
  color: var(--muted);
}

.message-actions {
  display: flex;
  gap: 6px;
  margin-top: 6px;
}

.message.own .message-actions {
  justify-content: flex-end;
}

.message-actions button {
  height: 30px;
  padding: 0 10px;
  border-color: var(--border);
  background: transparent;
  color: var(--muted);
  font-size: 12px;
}

.edit-box {
  display: grid;
  gap: 10px;
}

.edit-box div {
  display: flex;
  gap: 8px;
}

.upload-tray {
  display: grid;
  gap: 8px;
  margin: 0 0 12px;
}

.upload-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px 12px;
  align-items: center;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--panel);
}

.upload-main {
  min-width: 0;
}

.upload-name {
  overflow: hidden;
  color: var(--text);
  font-size: 14px;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.upload-meta {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}

.upload-progress {
  grid-column: 1 / -1;
  height: 6px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--soft);
}

.upload-progress span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--strong);
  transition: width 0.16s ease;
}

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

.upload-actions button {
  height: 30px;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0 10px;
  background: transparent;
  color: var(--muted);
  font-size: 12px;
}

.composer {
  align-items: flex-end;
}

.composer textarea {
  flex: 1;
  min-height: 44px;
  max-height: 180px;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  max-width: min(520px, calc(100vw - 32px));
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel);
  color: var(--text);
  box-shadow: var(--shadow);
  z-index: 20;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(0, 0, 0, 0.34);
  z-index: 30;
}

.modal-panel {
  width: min(520px, 100%);
  border: 1px solid var(--border);
  border-radius: 24px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.qr-panel {
  display: grid;
  gap: 16px;
  padding: 22px;
}

.modal-head,
.modal-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.qr-code {
  display: grid;
  place-items: center;
  width: 100%;
  min-height: 320px;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: #ffffff;
  color: #000000;
  overflow: hidden;
}

.qr-code svg {
  display: block;
  width: min(280px, 100%);
  max-width: 100%;
  height: auto;
}

.qr-empty {
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

.invite-link {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 14px;
  color: var(--muted);
  font-size: 13px;
}

.invite-link span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.invite-link strong {
  flex: 0 0 auto;
  color: var(--text);
}

@media (max-width: 900px) {
  .page {
    padding: 12px;
  }

  .room-page {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
  }

  .chat {
    height: auto;
    min-height: 70vh;
  }

  .message {
    max-width: 92%;
  }
}

@media (max-width: 620px) {
  .hero-panel,
  .sidebar,
  .chat {
    border-radius: 18px;
    padding: 18px;
  }

  .chat {
    padding-top: 0;
  }

  .chat-header {
    margin: 0 -18px;
    padding: 18px 18px 12px;
    border-radius: 18px 18px 0 0;
  }

  .topbar,
  .room-title-row,
  .chat-header,
  .home-actions,
  .join-box,
  .composer {
    align-items: stretch;
    flex-direction: column;
  }

  .join-box {
    min-width: 0;
  }

  .key-actions,
  .alias-row {
    align-items: stretch;
    flex-direction: column;
  }

  .primary-btn,
  .secondary-btn,
  .ghost-btn,
  .file-btn {
    justify-content: center;
    width: 100%;
  }

  h1 {
    font-size: 34px;
  }

  h2 {
    font-size: 15px;
  }

  .message {
    max-width: 100%;
  }

  .file-card {
    min-width: 0;
  }

  .modal-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .upload-item {
    grid-template-columns: minmax(0, 1fr);
  }

  .upload-actions {
    justify-content: flex-start;
  }
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: transparent;
  color: var(--text);
  font-size: 20px;
  line-height: 1;
}

.icon-btn:hover {
  border-color: var(--strong);
}

.masked-key {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  letter-spacing: 0.06em;
  user-select: none;
}

.hint {
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.key-actions-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: stretch;
}

.key-actions-grid button {
  width: 100%;
}

.danger-btn {
  color: var(--text);
}

@media (max-width: 620px) {
  .key-actions-grid {
    grid-template-columns: 1fr;
  }

  .room-status-row {
    align-items: center;
    flex-direction: row;
  }

  .room-status-row .status-line {
    flex: 1;
    min-width: 0;
  }

  .room-status-row .icon-btn {
    align-self: center;
  }

  .icon-btn {
    align-self: flex-start;
  }
}