:root {
  --bg-dark: #090d16;
  --bg-card: #111827;
  --bg-elevated: #1f2937;
  --border-color: rgba(255, 255, 255, 0.08);
  --text-main: #f9fafb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --emerald: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 4px 12px rgba(0,0,0,0.3);
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-family);
  line-height: 1.5;
  min-height: 100vh;
}

/* LOGIN VIEW */
.login-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 2rem;
}

.login-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  max-width: 440px;
  width: 100%;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.login-logo {
  font-size: 1.8rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.login-logo span {
  color: var(--accent);
}

.login-sub {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.admin-badge-notice {
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  color: var(--accent);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  margin-bottom: 1.5rem;
  line-height: 1.4;
}

.google-btn-wrapper {
  display: flex;
  justify-content: center;
  margin-top: 1rem;
}

/* ADMIN LAYOUT */
.admin-layout {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
}

.admin-logo {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
  text-decoration: none;
}

.admin-logo span {
  font-size: 1rem;
}

.user-profile-bar {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border-color);
}

.user-info {
  text-align: right;
}

.user-name {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
}

.user-email {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* NAV TABS */
.nav-tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
  overflow-x: auto;
}

.tab-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  padding: 0.75rem 1.2rem;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--text-main);
}

.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

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

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

/* CARDS & GRID */
.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-cols-4 {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.grid-two-thirds {
  grid-template-columns: 2fr 1fr;
}

@media (max-width: 992px) {
  .grid-two-thirds {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* STAT CARDS */
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.2rem;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.3rem;
}

.stat-value {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-main);
}

.stat-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* TABLES */
.table-container {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

th {
  text-align: left;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.02);
  color: var(--text-secondary);
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
}

td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
  vertical-align: middle;
}

tr:hover td {
  background: rgba(255, 255, 255, 0.015);
}

/* BADGES */
.badge {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  border-radius: 9999px;
  font-size: 0.72rem;
  font-weight: 700;
}

.badge-pending { background: rgba(245, 158, 11, 0.15); color: var(--warning); border: 1px solid rgba(245, 158, 11, 0.3); }
.badge-active { background: rgba(16, 185, 129, 0.15); color: var(--emerald); border: 1px solid rgba(16, 185, 129, 0.3); }
.badge-paused { background: rgba(239, 68, 68, 0.15); color: var(--danger); border: 1px solid rgba(239, 68, 68, 0.3); }
.badge-beginner { background: rgba(59, 130, 246, 0.15); color: var(--accent); border: 1px solid rgba(59, 130, 246, 0.3); }

/* BUTTONS & INPUTS */
.btn {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.btn:hover { background: var(--accent-hover); }
.btn-sm { padding: 0.3rem 0.6rem; font-size: 0.78rem; }
.btn-secondary { background: var(--bg-elevated); color: var(--text-main); border: 1px solid var(--border-color); }
.btn-secondary:hover { background: rgba(255, 255, 255, 0.1); }
.btn-emerald { background: var(--emerald); }
.btn-emerald:hover { background: #059669; }
.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #dc2626; }

input[type="text"], input[type="email"], textarea, select {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-family: inherit;
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--accent);
}

/* TASK BOARD */
.task-column {
  background: rgba(255,255,255,0.01);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.task-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.8rem;
  margin-bottom: 0.6rem;
}

.task-title {
  font-size: 0.88rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.task-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* CHAT BOX */
.chat-container {
  display: flex;
  height: 540px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-card);
}

.chat-project-list {
  width: 260px;
  border-right: 1px solid var(--border-color);
  overflow-y: auto;
}

.chat-project-item {
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: background 0.2s;
}

.chat-project-item:hover, .chat-project-item.active {
  background: var(--bg-elevated);
}

.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.chat-header {
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--border-color);
  font-weight: 700;
  background: rgba(255,255,255,0.01);
}

.chat-messages {
  flex: 1;
  padding: 1rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.msg-bubble {
  max-width: 70%;
  padding: 0.6rem 0.9rem;
  border-radius: 12px;
  font-size: 0.85rem;
  line-height: 1.4;
}

.msg-admin {
  align-self: flex-end;
  background: var(--accent);
  color: #fff;
  border-bottom-right-radius: 2px;
}

.msg-user {
  align-self: flex-start;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-bottom-left-radius: 2px;
}

.msg-meta {
  font-size: 0.68rem;
  opacity: 0.7;
  margin-top: 0.2rem;
  text-align: right;
}

.chat-input-bar {
  display: flex;
  gap: 0.5rem;
  padding: 0.8rem;
  border-top: 1px solid var(--border-color);
}

/* MODAL */
.modal {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
  z-index: 1000;
  justify-content: center;
  align-items: center;
  padding: 1rem;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  max-width: 680px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
}

.close-btn {
  position: absolute;
  top: 1rem; right: 1rem;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
}

.qa-box {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  padding: 0.8rem 1rem;
  border-radius: var(--radius-sm);
}

.qa-q { font-size: 0.8rem; font-weight: 700; color: var(--accent); margin-bottom: 0.3rem; }
.qa-a { font-size: 0.85rem; color: var(--text-main); white-space: pre-wrap; }