/* ═══════════════════════════════════════════════════════════════════════
   Ephemeral Chat — Dark IRC-inspired theme
   No frameworks. No CDN. No tracking.
   ═══════════════════════════════════════════════════════════════════════ */

/* ── Reset ──────────────────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg:            #1a1b1e;
  --bg-secondary:  #25262b;
  --bg-tertiary:   #2c2e33;
  --text:          #c1c2c5;
  --text-muted:    #909296;
  --text-bright:   #e0e0e0;
  --accent:        #4c9aff;
  --accent-hover:  #3a8af0;
  --danger:        #e03131;
  --danger-hover:  #c92a2a;
  --border:        #373a40;
  --system:        #7c7f85;
  --join:          #51cf66;
  --leave:         #ff6b6b;
  --admin:         #ffd43b;
  --font:          'SF Mono', 'Fira Code', 'Cascadia Code', 'Consolas',
                   'Monaco', 'Courier New', monospace;
}

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Screen containers ──────────────────────────────────────────────── */
.screen {
  height: 100%;
  display: flex;
  flex-direction: column;
}

.hidden {
  display: none !important;
}

/* ── Auth screen ────────────────────────────────────────────────────── */
#auth-screen {
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.auth-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 36px 32px;
  width: 100%;
  max-width: 440px;
  text-align: center;
}

.auth-box h1 {
  color: var(--text-bright);
  font-size: 28px;
  margin-bottom: 24px;
  font-weight: 600;
}

#auth-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

#auth-form input {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-bright);
  padding: 12px 14px;
  border-radius: 6px;
  font-family: var(--font);
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s;
}

#auth-form input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(76, 154, 255, 0.15);
}

#auth-form button {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 12px;
  border-radius: 6px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

#auth-form button:hover {
  background: var(--accent-hover);
}

.error {
  color: var(--danger);
  font-size: 13px;
  margin-top: 12px;
}

/* ── Chat screen ────────────────────────────────────────────────────── */
#chat-screen {
  height: 100%;
}

/* Header */
header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  min-height: 48px;
}

.header-left {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.header-left h2 {
  font-size: 15px;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.3px;
}

.user-count {
  color: var(--text-muted);
  font-size: 12px;
}

.header-right {
  display: flex;
  gap: 8px;
}

/* Admin buttons */
.admin-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 5px 10px;
  border-radius: 4px;
  font-family: var(--font);
  font-size: 11px;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.admin-btn:hover {
  border-color: var(--text-muted);
}

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

.admin-btn.danger:hover {
  background: var(--danger);
  color: #fff;
}

.admin-btn.muted {
  border-color: var(--admin);
  color: var(--admin);
}

/* ── Messages area ──────────────────────────────────────────────────── */
.messages {
  flex: 1;
  overflow-y: auto;
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 1px;
  /* Smooth scroll */
  scroll-behavior: smooth;
}

/* Custom scrollbar */
.messages::-webkit-scrollbar {
  width: 5px;
}

.messages::-webkit-scrollbar-track {
  background: transparent;
}

.messages::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

.messages::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Single message line */
.message {
  padding: 2px 0;
  word-break: break-word;
  line-height: 1.55;
  animation: fadeIn 0.15s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.message .timestamp {
  color: var(--text-muted);
  font-size: 11px;
  margin-right: 8px;
  white-space: nowrap;
  user-select: none;
}

.message .username {
  font-weight: 600;
  margin-right: 8px;
  white-space: nowrap;
}

.message .username.admin-user {
  color: var(--admin);
}

.message .username.admin-user::before {
  content: '⚡ ';
  font-size: 11px;
}

.message.system-msg {
  color: var(--system);
  font-style: italic;
  font-size: 13px;
}

.message.system-msg .join {
  color: var(--join);
}

.message.system-msg .leave {
  color: var(--leave);
}

.message .text {
  color: var(--text);
}

/* ── Footer / input ─────────────────────────────────────────────────── */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 10px 16px;
  flex-shrink: 0;
}

#message-form {
  display: flex;
  gap: 8px;
}

#message-input {
  flex: 1;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-bright);
  padding: 10px 14px;
  border-radius: 6px;
  font-family: var(--font);
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s;
}

#message-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(76, 154, 255, 0.15);
}

#message-form button {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 10px 20px;
  border-radius: 6px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}

#message-form button:hover {
  background: var(--accent-hover);
}

/* ── Responsive ─────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .auth-box {
    margin: 0;
    padding: 24px 20px;
  }

  header {
    padding: 8px 12px;
  }

  .messages {
    padding: 8px 12px;
  }

  footer {
    padding: 8px 12px;
  }

  #message-form button {
    padding: 10px 14px;
    font-size: 13px;
  }

  .header-left h2 {
    font-size: 14px;
  }
}

@media (max-width: 380px) {
  .header-right {
    gap: 4px;
  }

  .admin-btn {
    font-size: 10px;
    padding: 4px 8px;
  }
}

/* ── Reduce motion preference ───────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
  }

  .message {
    animation: none;
  }
}