:root {
  --bg: #0a0e17;
  --card: #0f1525;
  --muted: #8b9bb8;
  --soft: #151e30;
  --accent: #3a86ff;
  --accent-2: #5e60ce;
  --danger: #ff4d6d;
  --success: #38b000;
  --text: #e6edf3;
  --border: #1c2a44;
  --star-color: rgba(255, 255, 255, 0.7);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  margin: 0;
  font: 16px/1.45 system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, "Helvetica Neue", Arial;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  position: relative;
}

@keyframes fall {
  from { transform: translateY(-100px) translateX(0) rotate(0deg); opacity: 1; }
  to { transform: translateY(100vh) translateX(100px) rotate(360deg); opacity: 0; }
}

.stars {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
}

.star {
  position: absolute;
  background: var(--star-color);
  border-radius: 50%;
  animation: fall linear infinite;
}

.app {
  max-width: 1100px;
  margin: 3rem auto;
  padding: 0 1rem;
  position: relative;
}

.hidden { display: none !important; }

.card {
  background: linear-gradient(145deg, var(--card), #0d1321);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  animation: fadeIn 0.3s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

.card-sm {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.03);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

h1, h2, h3, h4 {
  color: var(--text);
  margin-bottom: 0.8rem;
  font-weight: 600;
}

h1 {
  font-size: 1.8rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin: 1rem 0;
}

input, textarea, button {
  font: inherit;
  border: none;
  outline: none;
}

input, textarea {
  background: var(--soft);
  border: 1px solid #253143;
  color: var(--text);
  border-radius: 8px;
  padding: 0.8rem 1rem;
  transition: all 0.2s ease;
}

input:focus, textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(58, 134, 255, 0.2);
}

input::placeholder, textarea::placeholder {
  color: #6b7688;
}

button {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  font-weight: 600;
  padding: 0.8rem 1.5rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}

button::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: 0.5s;
}

button:hover::after {
  left: 100%;
}

button:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(58, 134, 255, 0.3);
}

button:active {
  transform: translateY(0);
}

button.danger {
  background: linear-gradient(135deg, var(--danger), #c1121f);
}

button.ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

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

.chat__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--border);
}

.presence {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--muted);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: linear-gradient(135deg, #38b000, #38bdf8);
  box-shadow: 0 0 10px #38b000;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { opacity: 1; }
  50% { opacity: 0.5; }
  100% { opacity: 1; }
}

.lock-banner {
  margin-top: 0.8rem;
  padding: 0.5rem;
  background: rgba(239, 68, 68, 0.1);
  border: 1px dashed #ef4444;
  border-radius: 8px;
  color: #ef4444;
  text-align: center;
  animation: shake 0.5s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

#chat {
  display: grid;
  grid-template-columns: 260px 1fr;
  grid-template-rows: auto 1fr auto;
  gap: 1rem;
  grid-template-areas:
    "header header"
    "sidebar messages"
    "sidebar composer";
  min-height: 70vh;
}

#chat .chat__header { grid-area: header; }

.sidebar {
  grid-area: sidebar;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.you {
  display: flex;
  gap: 0.8rem;
  align-items: center;
  margin-bottom: 0.5rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--border);
}

.avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
  position: relative;
}

.avatar::after {
  content: '';
  position: absolute;
  bottom: 0;
  right: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--success);
  border: 2px solid var(--card);
}

.you__nick {
  font-weight: 700;
  color: var(--accent);
}

.peers {
  list-style: none;
  padding: 0;
  margin: 0.5rem 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.peers li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  background: rgba(15, 22, 33, 0.5);
  border: 1px solid var(--border);
  padding: 0.6rem;
  border-radius: 8px;
  transition: all 0.2s ease;
}

.peers li:hover {
  background: rgba(58, 134, 255, 0.1);
  transform: translateX(5px);
}

.peers .nick {
  font-weight: 600;
}

.badge {
  font-size: 0.75rem;
  color: #06121a;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-radius: 999px;
  padding: 0.2rem 0.5rem;
}

.messages {
  grid-area: messages;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  scroll-behavior: smooth;
}

.msg {
  display: flex;
  gap: 0.8rem;
  align-items: flex-start;
  max-width: 80%;
  background: rgba(15, 22, 33, 0.7);
  border: 1px solid var(--border);
  padding: 0.8rem;
  border-radius: 12px;
  animation: pop 0.2s ease;
  position: relative;
  transition: all 0.2s ease;
}

.msg:hover {
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.msg.me {
  align-self: flex-end;
  background: rgba(15, 28, 40, 0.7);
  border-color: #253143;
}

.msg .author {
  font-weight: 700;
  color: var(--accent);
}

.msg .time {
  color: var(--muted);
  font-size: 0.8rem;
  margin-left: 0.5rem;
}

.msg.private {
  border: 1px dashed #7dd3fc;
  background: rgba(15, 22, 33, 0.9);
}

.msg .trash {
  position: absolute;
  top: 6px;
  right: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  opacity: 0.6;
  transition: opacity 0.2s ease;
}

.msg .trash:hover {
  opacity: 1;
}

.system {
  color: var(--muted);
  font-style: italic;
  text-align: center;
  margin: 0.5rem 0;
}

@keyframes pop {
  from { transform: scale(0.95); opacity: 0.7; }
  to { transform: none; opacity: 1; }
}

.composer {
  grid-area: composer;
  display: flex;
  gap: 0.8rem;
}

#messageInput {
  flex: 1;
}

.fab {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 22px;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.35);
  z-index: 1001;
  transition: all 0.3s ease;
}

.fab:hover {
  transform: rotate(45deg);
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(5px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.modal:not(.hidden) {
  opacity: 1;
  pointer-events: all;
}

.modal__card {
  width: 100%;
  max-width: 900px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  transform: scale(0.9);
  transition: transform 0.3s ease;
}

.modal:not(.hidden) .modal__card {
  transform: scale(1);
}

.modal__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--border);
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.panel h4 {
  margin: 0.2rem 0 0.8rem;
  color: var(--accent);
}

.row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin: 0.8rem 0;
}

.switch {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  cursor: pointer;
}

.admin-users {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.admin-users li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  background: rgba(15, 22, 33, 0.5);
  border: 1px solid var(--border);
  padding: 0.6rem;
  border-radius: 10px;
}

.admin-users button {
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
}

.admin-only {
  display: none;
}

.admin-only:not(.hidden) {
  display: inline;
}

button:focus, input:focus, textarea:focus {
  outline: 2px solid var(--accent-2);
  outline-offset: 2px;
}

@media (max-width: 768px) {
  #chat {
    grid-template-columns: 1fr;
    grid-template-areas:
      "header"
      "messages"
      "composer";
  }
  
  .sidebar {
    display: none;
  }
  
  .grid {
    grid-template-columns: 1fr;
  }
  
  .app {
    margin: 1rem auto;
  }
  
  .msg {
    max-width: 90%;
  }
}