/* ----------------------------------------------------
   DESIGN SYSTEM & VARIABLES
   ---------------------------------------------------- */
:root {
  --bg-app: #090e17;
  --bg-card: #0f1624;
  --bg-card-header: #131b2d;
  --border-color: rgba(255, 255, 255, 0.07);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-active: #ffffff;
  
  /* Brand Accent Colors */
  --color-blue: #3b82f6;
  --color-green: #22c55e;
  --color-lightblue: #60a5fa;
  --color-orange: #f97316;
  --color-purple: #a855f7;
  --color-danger: #ef4444;
  --color-danger-hover: #dc2626;
  --color-btn-bg: #1e293b;
  --color-btn-hover: #334155;

  --font-family: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --transition-speed: 0.2s;
  --border-radius: 12px;
}

/* ----------------------------------------------------
   BASE STYLES
   ---------------------------------------------------- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-app);
  color: var(--text-main);
  font-family: var(--font-family);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding: 2rem 1.5rem;
  min-height: 100vh;
}

/* ----------------------------------------------------
   BASE SCROLLBARS
   ---------------------------------------------------- */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.1);
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* ----------------------------------------------------
   LOGIN OVERLAY STYLING (GLASSMORPHISM)
   ---------------------------------------------------- */
.login-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: radial-gradient(circle at center, #0f172a 0%, #020617 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  backdrop-filter: blur(10px);
  padding: 1.5rem;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.login-overlay:not(.active) {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.login-box-premium {
  background: rgba(15, 22, 36, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  width: 100%;
  max-width: 400px;
  padding: 2.5rem 2rem;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.login-logo {
  width: 48px;
  height: 48px;
  background-color: var(--color-blue);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.75rem;
  color: #fff;
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.4);
  margin-bottom: 1.25rem;
}

.login-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.25rem;
}

.login-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.form-group-login {
  width: 100%;
  margin-bottom: 1rem;
}

.form-group-login input {
  width: 100%;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  padding: 0.8rem 1rem;
  color: #fff;
  font-family: inherit;
  font-size: 0.95rem;
  transition: all var(--transition-speed);
}

.form-group-login input:focus {
  outline: none;
  border-color: var(--color-blue);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.15);
}

.login-error {
  color: var(--color-danger);
  font-size: 0.8rem;
  margin-bottom: 1rem;
  text-align: left;
  width: 100%;
  min-height: 1.2rem;
}

.btn-login-submit {
  width: 100%;
  background-color: var(--color-blue);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.85rem;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
  transition: all var(--transition-speed);
}

.btn-login-submit:hover {
  background-color: #2563eb;
  transform: translateY(-1px);
}

/* ----------------------------------------------------
   LAYOUT CONTAINER
   ---------------------------------------------------- */
.app-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ----------------------------------------------------
   HEADER STYLING
   ---------------------------------------------------- */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-box {
  width: 32px;
  height: 32px;
  background-color: var(--color-blue);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.25rem;
  color: #fff;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.app-title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.badge-pro {
  background: linear-gradient(135deg, #f97316, #ea580c);
  font-size: 0.7rem;
  font-weight: 800;
  color: #fff;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  letter-spacing: 0.05em;
  line-height: 1;
}

.app-version {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-top: 0.2rem;
}

.btn-logout {
  background-color: var(--color-btn-bg);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-speed);
}

.btn-logout:hover {
  background-color: var(--color-btn-hover);
  border-color: rgba(255,255,255,0.15);
}

/* ----------------------------------------------------
   STATS GRID
   ---------------------------------------------------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

.stat-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.15);
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
}

/* Stat Colors */
.text-blue { color: var(--color-blue); }
.text-green { color: var(--color-green); }
.text-lightblue { color: var(--color-lightblue); }
.text-orange { color: var(--color-orange); }
.text-purple { color: var(--color-purple); }

/* ----------------------------------------------------
   NAVIGATION TABS
   ---------------------------------------------------- */
.nav-tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 2px;
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.6rem 1.2rem;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  border-radius: 6px 6px 0 0;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: all var(--transition-speed);
}

.tab-btn:hover {
  color: var(--text-main);
  background-color: rgba(255, 255, 255, 0.02);
}

.tab-btn.active {
  color: var(--text-active);
  background-color: var(--color-blue);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
}

/* ----------------------------------------------------
   MAIN CONTENT PANELS
   ---------------------------------------------------- */
.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.card-header {
  padding: 1.25rem 1.5rem;
  background-color: var(--bg-card-header);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
}

/* ----------------------------------------------------
   BUTTONS
   ---------------------------------------------------- */
.btn-primary {
  background-color: var(--color-blue);
  color: #fff;
  border: none;
  padding: 0.55rem 1.1rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background-color var(--transition-speed);
}

.btn-primary:hover {
  background-color: #2563eb;
}

.btn-danger {
  background-color: var(--color-danger);
  color: #fff;
  border: none;
  padding: 0.55rem 1.1rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background-color var(--transition-speed);
}

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

/* ----------------------------------------------------
   DATA TABLE STYLING
   ---------------------------------------------------- */
.table-container {
  width: 100%;
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.data-table th {
  padding: 1rem 1.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-color);
  background-color: rgba(0,0,0,0.1);
}

.data-table td {
  padding: 1.25rem 1.5rem;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
}

.data-table tbody tr:hover {
  background-color: rgba(255, 255, 255, 0.01);
}

.customer-name {
  font-weight: 600;
  color: #fff;
  margin-bottom: 0.25rem;
}

.key-code-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.key-code {
  font-family: monospace;
  font-size: 0.85rem;
  color: var(--color-lightblue);
  letter-spacing: 0.02em;
}

.btn-copy {
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 0.9rem;
  opacity: 0.6;
  transition: opacity var(--transition-speed);
}

.btn-copy:hover {
  opacity: 1;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge.active {
  background-color: rgba(34, 197, 94, 0.15);
  color: var(--color-green);
  border: 1px solid rgba(34, 197, 94, 0.2);
}

.badge.expired {
  background-color: rgba(249, 115, 22, 0.15);
  color: var(--color-orange);
  border: 1px solid rgba(249, 115, 22, 0.2);
}

.badge.revoked {
  background-color: rgba(239, 68, 68, 0.15);
  color: var(--color-danger);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Device expand button */
.device-toggle {
  background: transparent;
  border: none;
  color: var(--text-main);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}

.device-toggle:hover {
  background-color: rgba(255,255,255,0.05);
}

/* Action Buttons inside Table */
.action-buttons {
  display: flex;
  gap: 0.5rem;
}

.btn-edit {
  background-color: var(--color-blue);
  color: #fff;
  border: none;
  padding: 0.35rem 0.8rem;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.8rem;
  cursor: pointer;
}

.btn-edit:hover {
  background-color: #2563eb;
}

.btn-revoke {
  background-color: var(--color-orange);
  color: #fff;
  border: none;
  padding: 0.35rem 0.8rem;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.8rem;
  cursor: pointer;
}

.btn-revoke:hover {
  background-color: #ea580c;
}

.btn-delete {
  background-color: var(--color-btn-bg);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  padding: 0.35rem;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-delete:hover {
  color: var(--color-danger);
  border-color: rgba(239, 68, 68, 0.3);
  background-color: rgba(239, 68, 68, 0.05);
}

/* ----------------------------------------------------
   EXPANDED DEVICE AREA
   ---------------------------------------------------- */
.expanded-row {
  background-color: rgba(0, 0, 0, 0.2);
}

.expanded-container {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.device-table {
  width: 100%;
  border-collapse: collapse;
}

.device-table th {
  background-color: transparent !important;
  border-bottom: 1px solid rgba(255,255,255,0.05) !important;
  padding: 0.5rem 1rem !important;
  font-size: 0.7rem !important;
  text-align: left;
}

.device-table td {
  padding: 0.75rem 1rem !important;
  font-size: 0.85rem !important;
  border-bottom: none !important;
}

.device-name-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.1rem;
}

.device-hwid {
  color: var(--color-lightblue);
  font-family: monospace;
}

.btn-unlink {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

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

/* ----------------------------------------------------
   META WEBHOOK INFO BOX
   ---------------------------------------------------- */
.webhook-info-box {
  background-color: rgba(255, 255, 255, 0.02);
  border-bottom: 1px solid var(--border-color);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.info-item {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.info-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

.copy-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background-color: rgba(0, 0, 0, 0.3);
  padding: 0.6rem 1rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  width: fit-content;
  max-width: 100%;
}

.copy-container code {
  font-family: monospace;
  font-size: 0.9rem;
  color: var(--color-lightblue);
  word-break: break-all;
}

.btn-copy-inline {
  background-color: var(--color-btn-bg);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  font-size: 0.75rem;
  cursor: pointer;
  white-space: nowrap;
}

.btn-copy-inline:hover {
  background-color: var(--color-btn-hover);
}

/* ----------------------------------------------------
   LOG STREAM TERMINAL
   ---------------------------------------------------- */
.log-stream-container {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.log-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.pulse-indicator {
  width: 8px;
  height: 8px;
  background-color: var(--color-green);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 8px var(--color-green);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.5; }
  50% { transform: scale(1.1); opacity: 1; box-shadow: 0 0 12px var(--color-green); }
  100% { transform: scale(0.95); opacity: 0.5; }
}

.log-terminal {
  background-color: #05080e;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem;
  font-family: monospace;
  font-size: 0.85rem;
  height: 350px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.log-line {
  line-height: 1.4;
  word-break: break-all;
}

.log-line.system { color: #818cf8; }
.log-line.messenger { color: #38bdf8; }
.log-line.instagram { color: #ec4899; }
.log-line.error { color: var(--color-danger); }

.log-timestamp {
  color: var(--text-muted);
  margin-right: 0.5rem;
}

/* ----------------------------------------------------
   META INBOX LAYOUT (2 CỘT PREMIUM)
   ---------------------------------------------------- */
.inbox-layout {
  display: flex;
  height: 620px;
  background-color: var(--bg-card);
}

/* Cột trái: Sidebar */
.inbox-sidebar {
  width: 320px;
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  background-color: rgba(0, 0, 0, 0.12);
}

.inbox-sidebar-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--bg-card-header);
}

.page-meta-profile {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.page-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: #fff;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.2);
}

.page-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-details {
  display: flex;
  flex-direction: column;
}

.page-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 150px;
}

.page-status {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.sidebar-actions {
  display: flex;
  gap: 0.4rem;
}

.btn-sidebar-icon {
  background: var(--color-btn-bg);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.85rem;
  transition: all var(--transition-speed);
}

.btn-sidebar-icon:hover {
  background-color: var(--color-btn-hover);
  border-color: rgba(255,255,255,0.15);
}

.conversations-list {
  flex: 1;
  overflow-y: auto;
}

.loading-conversations, .no-conversations {
  padding: 2rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Conversation Item */
.conv-item {
  padding: 1.15rem 1.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.02);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  transition: background-color var(--transition-speed);
}

.conv-item:hover {
  background-color: rgba(255, 255, 255, 0.02);
}

.conv-item.active {
  background-color: rgba(59, 130, 246, 0.08);
  border-left: 3px solid var(--color-blue);
  padding-left: calc(1.5rem - 3px);
}

.conv-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.conv-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 170px;
}

.conv-time {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.conv-preview {
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Cột phải: Chat Area */
.inbox-chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  background-color: rgba(0, 0, 0, 0.18);
}

.chat-header-info {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-card-header);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.chat-customer-name {
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
}

.chat-platform-badge {
  background-color: rgba(56, 189, 248, 0.12);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.18);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  text-transform: uppercase;
}

.chat-messages-container {
  flex: 1;
  padding: 1.5rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  background-color: #0b111e;
}

.chat-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-muted);
  gap: 1rem;
  text-align: center;
  padding: 2rem;
}

.chat-placeholder-icon {
  font-size: 3rem;
  opacity: 0.3;
}

/* Chat bubble styling */
.chat-bubble-wrapper {
  display: flex;
  flex-direction: column;
  width: 100%;
}

.chat-bubble-wrapper.incoming {
  align-items: flex-start;
}

.chat-bubble-wrapper.outgoing {
  align-items: flex-end;
}

.chat-bubble {
  max-width: 70%;
  padding: 0.75rem 1rem;
  border-radius: 12px;
  font-size: 0.9rem;
  line-height: 1.45;
  word-break: break-word;
}

.chat-bubble-wrapper.incoming .chat-bubble {
  background-color: #1e293b;
  color: var(--text-main);
  border-bottom-left-radius: 2px;
}

.chat-bubble-wrapper.outgoing .chat-bubble {
  background-color: var(--color-blue);
  color: #fff;
  border-bottom-right-radius: 2px;
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.25);
}

.chat-msg-time {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
  padding: 0 0.25rem;
}

/* Chat Input Bar */
.chat-input-bar {
  padding: 1rem 1.5rem;
  background-color: var(--bg-card-header);
  border-top: 1px solid var(--border-color);
}

.chat-input-bar input {
  flex: 1;
  background-color: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  color: #fff;
  font-family: inherit;
  font-size: 0.9rem;
}

.chat-input-bar input:focus {
  outline: none;
  border-color: var(--color-blue);
}

.chat-input-bar input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-send-message {
  background-color: var(--color-blue);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background-color var(--transition-speed);
}

.btn-send-message:hover:not(:disabled) {
  background-color: #2563eb;
}

.btn-send-message:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ----------------------------------------------------
   MODALS
   ---------------------------------------------------- */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6);
  z-index: 100;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}

.modal.active {
  display: flex;
}

.modal-content {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  width: 100%;
  max-width: 480px;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
  animation: modalSlide 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalSlide {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.modal-header {
  padding: 1.25rem 1.5rem;
  background-color: var(--bg-card-header);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-title {
  font-size: 1.1rem;
  font-weight: 600;
}

.btn-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
}

.btn-close:hover {
  color: #fff;
}

form {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-input {
  background-color: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.65rem 0.85rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-family: inherit;
  width: 100%;
}

.form-input:focus {
  outline: none;
  border-color: var(--color-blue);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.btn-cancel {
  background-color: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.55rem 1.1rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
}

.btn-cancel:hover {
  background-color: var(--color-btn-bg);
}

.btn-submit {
  background-color: var(--color-blue);
  color: #fff;
  border: none;
  padding: 0.55rem 1.1rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
}

.btn-submit:hover {
  background-color: #2563eb;
}

/* ----------------------------------------------------
   EMPTY STATE
   ---------------------------------------------------- */
.empty-state {
  padding: 3rem 2rem;
  text-align: center;
  color: var(--text-muted);
}

/* ----------------------------------------------------
   RESPONSIVE DESIGN
   ---------------------------------------------------- */
@media(max-width: 768px) {
  body {
    padding: 1rem;
  }
  .app-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
  .header-right {
    width: 100%;
    display: flex;
    justify-content: flex-end;
  }
  
  .inbox-layout {
    flex-direction: column;
    height: 800px;
  }
  .inbox-sidebar {
    width: 100%;
    height: 300px;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }
}