:root {
  --rail: #18191c;
  --side: #1f2125;
  --main: #26282d;
  --elevated: #1a1b1e;
  --input: #1a1b1e;
  --hover: rgba(255, 255, 255, 0.04);
  --active: rgba(168, 85, 247, 0.16);

  --text: #dbdee1;
  --text-muted: #949ba4;
  --text-faint: #6d7178;
  --text-h: #f2f3f5;

  --border: #303237;
  --accent: #a855f7;
  --accent-strong: #9333ea;
  --accent-soft: rgba(168, 85, 247, 0.14);
  --danger: #f23f42;
  --online: #23a55a;

  --radius: 10px;
  --radius-sm: 7px;
  --sans: 'Inter', system-ui, 'Segoe UI', Roboto, sans-serif;
  --mono: ui-monospace, 'SF Mono', Consolas, monospace;

  color-scheme: dark;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

* {
  box-sizing: border-box;
}

html,
body,
#root {
  height: 100%;
  margin: 0;
}

body {
  font: 15px/1.5 var(--sans);
  color: var(--text);
  background: var(--main);
}

#root {
  width: 100%;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

h1,
h2,
h3,
h4 {
  color: var(--text-h);
  font-weight: 600;
  margin: 0;
}

p {
  margin: 0;
}

button {
  font-family: inherit;
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-thumb {
  background: #00000050;
  border-radius: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}

/* ---------- shared controls ---------- */
.input {
  width: 100%;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  background: var(--input);
  color: var(--text-h);
  font-size: 14px;
  outline: none;
  transition: border-color 0.12s ease;
}
.input::placeholder {
  color: var(--text-faint);
}
.input:focus {
  border-color: var(--accent);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: none;
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  cursor: pointer;
  transition:
    background 0.12s ease,
    opacity 0.12s ease,
    transform 0.05s ease;
}
.btn:hover {
  background: var(--accent-strong);
}
.btn:active {
  transform: translateY(1px);
}
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.btn-secondary {
  background: #3a3d44;
  color: var(--text-h);
}
.btn-secondary:hover {
  background: #44474f;
}
.btn-ghost {
  background: transparent;
  color: var(--text-muted);
}
.btn-ghost:hover {
  background: var(--hover);
  color: var(--text-h);
}
.btn-danger {
  background: var(--danger);
}
.btn-danger:hover {
  background: #d83a3d;
}

.muted {
  color: var(--text-muted);
}
.error-text {
  color: #f87171;
}
.list-reset {
  list-style: none;
  padding: 0;
  margin: 0;
}

/* ---------- login ---------- */
.login-screen {
  flex: 1;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(900px 500px at 50% -10%, rgba(168, 85, 247, 0.22), transparent 60%),
    var(--main);
}
.login-card {
  width: min(420px, 100%);
  background: var(--side);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  box-shadow: 0 20px 50px -20px rgba(0, 0, 0, 0.6);
}
.login-card h1 {
  font-size: 24px;
  margin-bottom: 4px;
}
.login-sub {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 24px;
}
.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}
.field label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.login-card .btn {
  width: 100%;
  margin-top: 4px;
}

/* ---------- chat shell ---------- */
.dc-shell {
  flex: 1;
  height: 100vh;
  display: flex;
  overflow: hidden;
  background: var(--main);
}

/* server rail */
.dc-rail {
  width: 72px;
  background: var(--rail);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 12px 0;
  overflow-y: auto;
}
.dc-rail::-webkit-scrollbar {
  display: none;
}
.rail-btn {
  position: relative;
  width: 48px;
  height: 48px;
  border: none;
  border-radius: 24px;
  background: var(--side);
  color: var(--text-h);
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  transition:
    border-radius 0.15s ease,
    background 0.15s ease;
}
.rail-btn:hover {
  border-radius: 16px;
  background: var(--accent);
  color: #fff;
}
.rail-btn.active {
  border-radius: 16px;
  background: var(--accent);
  color: #fff;
}
.rail-btn.active::before {
  content: '';
  position: absolute;
  left: -12px;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 28px;
  background: #fff;
  border-radius: 0 4px 4px 0;
}
.rail-add {
  background: transparent;
  color: var(--online);
  border: 1px solid var(--border);
  font-size: 22px;
  line-height: 1;
}
.rail-add:hover {
  background: var(--online);
  color: #fff;
}
.rail-sep {
  width: 32px;
  height: 1px;
  background: var(--border);
  flex: none;
}

/* channel sidebar */
.dc-sidebar {
  width: 248px;
  background: var(--side);
  display: flex;
  flex-direction: column;
}
.dc-sidebar-head {
  height: 50px;
  padding: 0 16px;
  display: flex;
  align-items: center;
  font-weight: 700;
  color: var(--text-h);
  border-bottom: 1px solid #00000040;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2);
}
.dc-sidebar-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 12px 8px;
}
.dc-section-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 8px 4px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.dc-section-label button {
  border: none;
  background: transparent;
  color: var(--text-faint);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  padding: 0 4px;
}
.dc-section-label button:hover {
  color: var(--text-h);
}
.chan-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 6px;
  text-align: left;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  margin: 1px 0;
  color: var(--text-muted);
  font-size: 15px;
  cursor: pointer;
}
.chan-btn .hash {
  color: var(--text-faint);
  font-weight: 600;
}
.chan-btn:hover {
  background: var(--hover);
  color: var(--text);
}
.chan-btn.active {
  background: var(--active);
  color: var(--text-h);
}
.chan-tag {
  margin-left: auto;
  font-size: 10px;
  font-weight: 700;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 4px;
  padding: 0 4px;
}
.dc-empty {
  color: var(--text-faint);
  font-size: 13px;
  padding: 8px 10px;
}

/* user bar */
.dc-userbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  background: var(--elevated);
}
.dc-userbar .who {
  flex: 1;
  min-width: 0;
}
.dc-userbar .who .nm {
  color: var(--text-h);
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.dc-userbar .who .sub {
  color: var(--text-muted);
  font-size: 11px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.icon-btn {
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 7px;
  background: transparent;
  color: var(--text-muted);
  font-size: 15px;
  cursor: pointer;
}
.icon-btn:hover {
  background: var(--hover);
  color: var(--text-h);
}

/* avatar */
.avatar {
  flex: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), #6d28d9);
}
.avatar.lg {
  width: 40px;
  height: 40px;
  font-size: 15px;
}

/* main column */
.dc-main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  background: var(--main);
}
.dc-topbar {
  height: 50px;
  flex: none;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
  border-bottom: 1px solid #00000040;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2);
}
.dc-topbar .title {
  font-weight: 700;
  color: var(--text-h);
}
.dc-topbar .hash {
  color: var(--text-faint);
  margin-right: 2px;
}
.dc-topbar .spacer {
  flex: 1;
}

.dc-messages {
  flex: 1;
  overflow-y: auto;
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.msg {
  display: flex;
  gap: 12px;
  padding: 6px 8px;
  border-radius: 8px;
}
.msg:hover {
  background: rgba(0, 0, 0, 0.12);
}
.msg .body {
  min-width: 0;
}
.msg .meta {
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.msg .author {
  font-weight: 600;
  color: var(--text-h);
  font-size: 14px;
}
.msg .time {
  font-size: 11px;
  color: var(--text-faint);
}
.msg .text {
  color: var(--text);
  word-break: break-word;
}
.msg.deleted .text {
  color: var(--text-faint);
  font-style: italic;
}
.dc-empty-center {
  margin: auto;
  text-align: center;
  color: var(--text-faint);
}

/* composer */
.dc-composer {
  flex: none;
  display: flex;
  gap: 10px;
  padding: 0 16px 20px;
}
.dc-composer .input {
  background: #303237;
  padding: 12px 14px;
}
.dc-composer .btn {
  flex: none;
}

/* members */
.dc-members {
  width: 232px;
  background: var(--side);
  padding: 16px 8px;
  overflow-y: auto;
}
.dc-members .dc-section-label {
  cursor: default;
}
.member-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
}
.member-row:hover {
  background: var(--hover);
}
.member-row .nm {
  color: var(--text);
  font-size: 14px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.member-row .you {
  color: var(--text-faint);
  font-size: 11px;
  margin-left: 4px;
}
.dot {
  position: relative;
}
.dot::after {
  content: '';
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--online);
  border: 2px solid var(--side);
}

/* ---------- modal ---------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(2px);
  display: grid;
  place-items: center;
  z-index: 50;
  padding: 20px;
}
.modal-card {
  width: min(460px, 100%);
  max-height: 84vh;
  overflow: auto;
  background: var(--side);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px;
  box-shadow: 0 24px 60px -20px rgba(0, 0, 0, 0.7);
}
.modal-card h3 {
  font-size: 18px;
  margin-bottom: 14px;
}
.modal-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 10px 0;
  max-height: 240px;
  overflow: auto;
}
.check-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.check-row:hover {
  background: var(--hover);
}
.check-row input {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
}
.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 18px;
}
.modal-actions .btn {
  flex: 1;
}