/* ==========================================================================
   AETHER INDUSTRIES — ALPHA AMHARIC TEACHING PORTAL
   Design Philosophy: Minimal, Clean, Professional White Interface
   ========================================================================== */

:root {
  --bg-primary: #FFFFFF;
  --bg-secondary: #F9FAFB;
  --bg-tertiary: #F3F4F6;
  --text-main: #111827;
  --text-muted: #4B5563;
  --text-light: #9CA3AF;
  --border-light: #E5E7EB;
  --border-focus: #0284C7;
  --accent: #0284C7;
  --accent-light: #E0F2FE;
  --accent-hover: #0369A1;
  --success: #059669;
  --success-bg: #ECFDF5;
  --warning: #D97706;
  --warning-bg: #FFFBEB;
  --danger: #DC2626;
  --danger-bg: #FEF2F2;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --font-ethio: 'Noto Sans Ethiopic', 'Inter', sans-serif;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header & Navigation */
.teach-header {
  border-bottom: 1px solid var(--border-light);
  background-color: var(--bg-primary);
  position: sticky;
  top: 0;
  z-index: 40;
}

.teach-header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.875rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.teach-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
}

.teach-brand img {
  height: 28px;
  width: auto;
}

.teach-brand-title {
  font-weight: 600;
  font-size: 0.9375rem;
  letter-spacing: -0.01em;
}

.teach-brand-badge {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--accent);
  background-color: var(--accent-light);
  padding: 0.15rem 0.5rem;
  border-radius: 9999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.teach-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.teach-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.15s ease;
}

.teach-nav a:hover,
.teach-nav a.active {
  color: var(--text-main);
}

.btn-primary {
  background-color: var(--text-main);
  color: #FFFFFF !important;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid var(--text-main);
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-primary:hover {
  background-color: #000000;
  border-color: #000000;
}

.btn-secondary {
  background-color: var(--bg-primary);
  color: var(--text-main) !important;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid var(--border-light);
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-secondary:hover {
  background-color: var(--bg-secondary);
  border-color: #D1D5DB;
}

/* Layout Container */
.teach-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  width: 100%;
  flex: 1;
}

.teach-container-narrow {
  max-width: 680px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  width: 100%;
  flex: 1;
}

/* Typography */
h1.page-title {
  font-size: 1.875rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

p.page-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  line-height: 1.5;
}

/* Cards & Surfaces */
.card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

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

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-main);
}

/* Forms */
.form-group {
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-main);
}

.form-label-hint {
  font-weight: normal;
  color: var(--text-light);
  font-size: 0.75rem;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.625rem 0.875rem;
  font-size: 0.875rem;
  font-family: inherit;
  color: var(--text-main);
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.12);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.4;
  margin-top: 0.5rem;
}

.checkbox-group input[type="checkbox"] {
  margin-top: 0.15rem;
  accent-color: var(--accent);
}

/* Tables */
.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border-light);
  border-radius: 8px;
}

.teach-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.875rem;
}

.teach-table th {
  background-color: var(--bg-secondary);
  color: var(--text-muted);
  font-weight: 600;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.teach-table td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-main);
}

.teach-table tr:last-child td {
  border-bottom: none;
}

.teach-table tr:hover td {
  background-color: var(--bg-secondary);
}

/* Status Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.55rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: capitalize;
}

.badge-pending {
  background-color: var(--warning-bg);
  color: var(--warning);
}

.badge-approved,
.badge-active {
  background-color: var(--success-bg);
  color: var(--success);
}

.badge-rejected,
.badge-suspended {
  background-color: var(--danger-bg);
  color: var(--danger);
}

.badge-completed {
  background-color: var(--accent-light);
  color: var(--accent);
}

/* Metrics HUD */
.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.metric-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 1.25rem;
}

.metric-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin-bottom: 0.375rem;
}

.metric-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.metric-sub {
  font-size: 0.75rem;
  color: var(--text-light);
  margin-top: 0.25rem;
}

/* Chat Interface */
.chat-wrapper {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 180px);
  min-height: 500px;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  background-color: var(--bg-primary);
  overflow: hidden;
}

.chat-header {
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border-light);
  background-color: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.msg-bubble {
  max-width: 75%;
  padding: 0.875rem 1.125rem;
  border-radius: 10px;
  font-size: 0.9375rem;
  line-height: 1.5;
  position: relative;
}

.msg-teacher {
  align-self: flex-end;
  background-color: var(--text-main);
  color: #FFFFFF;
  border-bottom-right-radius: 2px;
}

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

.msg-meta {
  font-size: 0.6875rem;
  margin-top: 0.375rem;
  opacity: 0.75;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.correct-btn {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
}

.correct-btn:hover {
  background-color: var(--accent-light);
}

.chat-input-bar {
  padding: 0.875rem 1.25rem;
  border-top: 1px solid var(--border-light);
  background-color: var(--bg-primary);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.voice-btn {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-light);
  color: var(--text-muted);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
  shrink-0: 0;
}

.voice-btn.recording {
  background-color: var(--danger-bg);
  border-color: var(--danger);
  color: var(--danger);
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.08); }
  100% { transform: scale(1); }
}

/* Toast */
.toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background-color: var(--text-main);
  color: #FFFFFF;
  padding: 0.75rem 1.25rem;
  border-radius: 6px;
  font-size: 0.875rem;
  z-index: 100;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: opacity 0.2s ease;
}

/* Footer */
.teach-footer {
  border-top: 1px solid var(--border-light);
  background-color: var(--bg-primary);
  padding: 1.5rem;
  font-size: 0.8125rem;
  color: var(--text-light);
  text-align: center;
  margin-top: auto;
}

@media (max-width: 768px) {
  .teach-header-inner {
    flex-wrap: wrap;
  }
  .teach-nav {
    gap: 0.75rem;
  }
  .msg-bubble {
    max-width: 90%;
  }
}