:root {
  --bg: #000000;
  --green: #00ff41;
  --green-dim: #008f11;
  --green-deep: #003b00;
  --green-glow: rgba(0, 255, 65, 0.45);
  --green-glow-soft: rgba(0, 255, 65, 0.15);
  --red: #ff3b3b;
  --mono: 'Share Tech Mono', 'VT323', ui-monospace, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--green);
  font-family: var(--mono);
  overflow: hidden;
}

body {
  position: relative;
}

#matrix-bg {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.35;
  pointer-events: none;
  filter: blur(1.8px);
}

.screen {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

.hidden { display: none !important; }

/* ---------- Login ---------- */
#login-screen {
  align-items: center;
  justify-content: center;
}

.login-box {
  width: min(420px, 90vw);
  padding: 32px;
  border: 1px solid var(--green-dim);
  background: rgba(0, 20, 0, 0.55);
  box-shadow: 0 0 24px var(--green-glow), inset 0 0 24px var(--green-glow-soft);
  text-align: left;
}

.logo {
  font-size: 32px;
  letter-spacing: 2px;
  text-shadow: 0 0 8px var(--green-glow);
  margin-bottom: 4px;
}

.logo.small { font-size: 18px; }

.subtitle {
  color: var(--green-dim);
  font-size: 14px;
  margin-bottom: 24px;
}

#login-form label {
  display: block;
  font-size: 13px;
  color: var(--green-dim);
  margin-bottom: 6px;
  letter-spacing: 1px;
}

#login-form input {
  width: 100%;
  background: transparent;
  color: var(--green);
  border: 1px solid var(--green-dim);
  padding: 10px 12px;
  font-family: var(--mono);
  font-size: 18px;
  outline: none;
  caret-color: var(--green);
}

#login-form input:focus {
  border-color: var(--green);
  box-shadow: 0 0 12px var(--green-glow);
}

#login-form button {
  margin-top: 16px;
  width: 100%;
  background: transparent;
  color: var(--green);
  border: 1px solid var(--green);
  padding: 10px;
  font-family: var(--mono);
  font-size: 16px;
  letter-spacing: 2px;
  cursor: pointer;
  transition: 120ms ease;
}

#login-form button:hover {
  background: var(--green);
  color: #000;
  box-shadow: 0 0 16px var(--green-glow);
}

.error {
  margin-top: 12px;
  min-height: 18px;
  color: var(--red);
  font-size: 13px;
  text-shadow: 0 0 6px rgba(255, 59, 59, 0.5);
}

/* ---------- Chat ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 18px;
  border-bottom: 1px solid var(--green-dim);
  background: rgba(0, 12, 0, 0.6);
}

.status {
  font-size: 13px;
  color: var(--green-dim);
  display: flex;
  align-items: center;
  gap: 10px;
}

#logout-btn {
  background: transparent;
  color: var(--green);
  border: 1px solid var(--green-dim);
  padding: 4px 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 1px;
  cursor: pointer;
  transition: 120ms ease;
}

#logout-btn:hover {
  background: var(--green);
  color: #000;
  border-color: var(--green);
  box-shadow: 0 0 10px var(--green-glow);
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px var(--green-glow);
  animation: pulse 1.6s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.layout {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 260px;
  min-height: 0;
}

.chat-pane {
  display: flex;
  flex-direction: column;
  min-height: 0;
  border-right: 1px solid var(--green-dim);
  background: rgba(0, 8, 0, 0.55);
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px 18px;
  font-size: 15px;
  line-height: 1.5;
}

.messages::-webkit-scrollbar { width: 8px; }
.messages::-webkit-scrollbar-track { background: transparent; }
.messages::-webkit-scrollbar-thumb {
  background: var(--green-deep);
  border: 1px solid var(--green-dim);
}

.msg { margin-bottom: 6px; word-wrap: break-word; }
.msg .ts { color: var(--green-deep); margin-right: 6px; }
.msg .user { color: var(--green); text-shadow: 0 0 6px var(--green-glow); }
.msg .user.me { color: #aaffb0; }
.msg .text { color: var(--green); }

.msg.system {
  color: var(--green-dim);
  font-style: italic;
}

.msg.system .ts {
  font-style: normal;
}

#message-form {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-top: 1px solid var(--green-dim);
  background: rgba(0, 14, 0, 0.7);
}

#attach-btn {
  background: transparent;
  color: var(--green);
  border: 1px solid var(--green-dim);
  padding: 6px 10px;
  font-family: var(--mono);
  font-size: 14px;
  cursor: pointer;
  transition: 120ms ease;
}

#attach-btn:hover {
  background: var(--green);
  color: #000;
  border-color: var(--green);
  box-shadow: 0 0 10px var(--green-glow);
}

.attachment-preview {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border-top: 1px solid var(--green-deep);
  background: rgba(0, 20, 0, 0.6);
  font-size: 13px;
  color: var(--green-dim);
}

.attachment-preview #attachment-thumb-wrap {
  width: 44px;
  height: 44px;
  border: 1px solid var(--green-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  flex-shrink: 0;
  font-size: 11px;
  color: var(--green);
  background: rgba(0, 20, 0, 0.4);
}

.attachment-preview #attachment-thumb-wrap img,
.attachment-preview #attachment-thumb-wrap video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.attachment-preview #attachment-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--green);
}

#attachment-clear {
  background: transparent;
  color: var(--red);
  border: 1px solid var(--red);
  padding: 4px 8px;
  font-family: var(--mono);
  font-size: 12px;
  cursor: pointer;
}

#attachment-clear:hover {
  background: var(--red);
  color: #000;
}

.msg .image-wrap {
  display: block;
  margin-top: 6px;
}

.msg .image-wrap img {
  max-width: min(360px, 70%);
  max-height: 320px;
  border: 1px solid var(--green-dim);
  box-shadow: 0 0 10px var(--green-glow-soft);
  cursor: pointer;
  display: block;
}

.msg .image-wrap img:hover {
  box-shadow: 0 0 14px var(--green-glow);
}

.msg .video-wrap {
  display: block;
  margin-top: 6px;
}

.msg .video-wrap video {
  max-width: min(420px, 80%);
  max-height: 360px;
  border: 1px solid var(--green-dim);
  box-shadow: 0 0 10px var(--green-glow-soft);
  display: block;
  background: #000;
}

#lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
}

#lightbox img {
  max-width: 92vw;
  max-height: 92vh;
  border: 1px solid var(--green);
  box-shadow: 0 0 30px var(--green-glow);
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: rgba(0, 0, 0, 0.78);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: modal-fade 180ms ease-out;
}

@keyframes modal-fade {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-box {
  width: min(440px, 90vw);
  border: 1px solid var(--green);
  background: rgba(0, 16, 0, 0.92);
  box-shadow: 0 0 30px var(--green-glow), inset 0 0 24px var(--green-glow-soft);
  padding: 22px 24px;
  text-align: left;
}

.modal-title {
  color: var(--green-dim);
  font-size: 13px;
  letter-spacing: 2px;
  margin-bottom: 12px;
  border-bottom: 1px dashed var(--green-deep);
  padding-bottom: 8px;
}

.modal-body {
  color: var(--green);
  font-size: 16px;
  line-height: 1.6;
  margin-bottom: 18px;
  text-shadow: 0 0 4px var(--green-glow-soft);
}

.modal-body .hl {
  color: #aaffb0;
  text-shadow: 0 0 8px var(--green-glow);
}

.modal-box button {
  background: transparent;
  color: var(--green);
  border: 1px solid var(--green);
  padding: 8px 16px;
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 2px;
  cursor: pointer;
  transition: 120ms ease;
}

.modal-box button:hover {
  background: var(--green);
  color: #000;
  box-shadow: 0 0 14px var(--green-glow);
}

.prompt {
  color: var(--green);
  text-shadow: 0 0 6px var(--green-glow);
  font-size: 18px;
}

#message-input {
  flex: 1;
  background: transparent;
  border: 1px solid var(--green-deep);
  color: var(--green);
  padding: 8px 10px;
  font-family: var(--mono);
  font-size: 15px;
  outline: none;
  caret-color: var(--green);
}

#message-input:focus {
  border-color: var(--green);
  box-shadow: 0 0 10px var(--green-glow);
}

#message-form button {
  background: transparent;
  color: var(--green);
  border: 1px solid var(--green);
  padding: 8px 14px;
  font-family: var(--mono);
  letter-spacing: 1px;
  cursor: pointer;
  transition: 120ms ease;
}

#message-form button:hover {
  background: var(--green);
  color: #000;
  box-shadow: 0 0 12px var(--green-glow);
}

.users-pane {
  background: rgba(0, 8, 0, 0.7);
  padding: 14px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.pane-section {
  display: flex;
  flex-direction: column;
}

.pane-section + .pane-section {
  border-top: 1px solid var(--green-deep);
  padding-top: 16px;
}

.pane-title {
  color: var(--green-dim);
  font-size: 13px;
  letter-spacing: 1px;
  margin-bottom: 12px;
  border-bottom: 1px dashed var(--green-deep);
  padding-bottom: 8px;
}

.topbar-controls {
  display: flex;
  align-items: center;
  gap: 14px;
}

.color-custom {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--green-dim);
  letter-spacing: 1px;
}

.color-custom input[type="color"] {
  width: 28px;
  height: 22px;
  background: transparent;
  border: 1px solid var(--green-deep);
  padding: 0;
  cursor: pointer;
}

.color-custom input[type="color"]::-webkit-color-swatch-wrapper { padding: 2px; }
.color-custom input[type="color"]::-webkit-color-swatch { border: none; }

#user-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

#user-list li {
  padding: 6px 4px;
  font-size: 14px;
  color: var(--green);
  display: flex;
  align-items: center;
  gap: 8px;
}

#user-list li::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--green);
  border-radius: 50%;
  box-shadow: 0 0 6px var(--green-glow);
}

#user-list li.me {
  color: #aaffb0;
  text-shadow: 0 0 6px var(--green-glow);
}

@media (max-width: 720px) {
  .layout { grid-template-columns: 1fr; grid-template-rows: 1fr 160px; }
  .chat-pane { border-right: none; border-bottom: 1px solid var(--green-dim); }
}