@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Outfit:wght@400;600;700&display=swap");

[data-theme="dark"] {
  --primary: #ccd6f6;
  --secondary: #1e2d4a;
  --accent: #64ffda;
  --bg: #020c1b;
  --card-bg: #0c1c38;
  --item-bg: #112240;
  --border: #1e2d4a;
  --text: #ccd6f6;
  --text-muted: #8892b0;
  
  --sidebar-bg: #0a192f;
  --sidebar-text: #ffffff;
  --login-overlay-bg: radial-gradient(circle at top right, #172a45 0%, #020c1b 60%);
  --login-box-bg: rgba(255, 255, 255, 0.03);
  --login-input-bg: rgba(23, 42, 69, 0.5);
  --login-input-text: #ffffff;

  --btn-bg: #112240;
  --btn-text: #ccd6f6;
  --btn-hover: #1e2d4a;
  --btn-primary-bg: #64ffda;
  --btn-primary-text: #020c1b;
  --btn-primary-hover: #52e0c4;
}

[data-theme="light"] {
  --primary: #0a192f;
  --secondary: #e2e8f0;
  --accent: #2563eb;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --item-bg: #f8fafc;
  --border: #e2e8f0;
  --text: #0f172a;
  --text-muted: #64748b;
  
  --sidebar-bg: #ffffff;
  --sidebar-text: #0a192f;
  --login-overlay-bg: #f8fafc;
  --login-box-bg: #ffffff;
  --login-input-bg: #f1f5f9;
  --login-input-text: #0f172a;

  --btn-bg: #ffffff;
  --btn-text: #0f172a;
  --btn-hover: #f1f5f9;
  --btn-primary-bg: #0a192f;
  --btn-primary-text: #ffffff;
  --btn-primary-hover: #172a45;
}

:root {
  --font-heading: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;
  --sidebar-w: 260px;
}

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* LOGIN OVERLAY */
.login-overlay {
  position: fixed;
  inset: 0;
  background: var(--login-overlay-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.login-overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.login-box {
  background: var(--login-box-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(120, 120, 120, 0.2);
  padding: 40px;
  border-radius: 20px;
  width: 100%;
  max-width: 400px;
  color: var(--text);
  text-align: center;
  box-shadow: 0 25px 50px -12px rgba(2, 12, 27, 0.2);
}

.login-logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}

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

.login-box h2 {
  font-family: var(--font-heading);
  font-size: 1.7rem;
  margin: 0 0 10px;
}

.login-box p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 30px;
}

.login-input {
  width: 100%;
  box-sizing: border-box;
  background: var(--login-input-bg);
  border: 1px solid var(--border);
  color: var(--login-input-text);
  padding: 14px;
  border-radius: 10px;
  margin-bottom: 15px;
  font-family: var(--font-body);
}

.login-input::placeholder {
  color: var(--text-muted);
}

.login-input:focus {
  border-color: var(--accent);
  outline: none;
}

.login-btn {
  width: 100%;
  padding: 14px;
  border-radius: 10px;
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  font-weight: 600;
  border: none;
  cursor: pointer;
  margin-top: 10px;
  font-size: 1rem;
}

.login-btn:hover {
  background: var(--btn-primary-hover);
}

.login-error {
  color: #ef4444;
  font-size: 0.9rem;
  margin-bottom: 15px;
  min-height: 20px;
}

.login-back {
  display: block;
  margin-top: 25px;
  color: #8892b0;
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.3s;
}

.login-back:hover {
  color: var(--accent);
}

/* LAYOUT */
.dashboard-layout {
  display: flex;
  min-height: 100vh;
}

/* SIDEBAR */
.sidebar {
  width: var(--sidebar-w);
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  position: fixed;
  height: 100vh;
  top: 0;
  bottom: 0;
  left: 0;
}

.sidebar-brand {
  padding: 30px 24px;
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border);
  color: var(--accent);
}

.sidebar-nav {
  padding: 24px 12px;
  flex: 1;
}

.nav-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  margin-bottom: 8px;
  background: transparent;
  color: var(--sidebar-text);
  opacity: 0.8;
  border: none;
  border-radius: 10px;
  text-align: left;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.nav-btn:hover {
  opacity: 1;
  background: rgba(120, 120, 120, 0.1);
}

.nav-btn.active {
  color: var(--accent);
  background: rgba(100, 255, 218, 0.1);
}

.nav-btn span {
  font-size: 1.2rem;
}

.sidebar-footer {
  padding: 20px 12px;
  border-top: 1px solid var(--border);
}

/* MAIN CONTENT */
.main-content {
  margin-left: var(--sidebar-w);
  flex: 1;
  padding: 40px;
  max-width: 1100px;
}

.page-header {
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--border);
}

.page-header h1 {
  margin: 0 0 5px;
  font-family: var(--font-heading);
  font-size: 2rem;
  color: var(--primary);
}

.page-header p {
  margin: 0;
  color: var(--text-muted);
}

/* TABS */
.tab-content {
  display: none;
}

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

/* CARDS & UI ELEMENTS */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  margin-bottom: 24px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--primary);
}

.row {
  display: flex;
  gap: 20px;
  align-items: start;
}

.column {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.strong-label {
  color: var(--primary);
}

.input {
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  outline: none;
  color: var(--text);
  transition: border-color 0.2s ease;
}

.input:focus {
  border-color: var(--accent);
}

.btn {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 20px;
  background: var(--btn-bg);
  color: var(--btn-text);
  cursor: pointer;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn:hover:not(:disabled) {
  background: var(--btn-hover);
}

.btn.primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  border: none;
}

.btn.primary:hover:not(:disabled) {
  background: var(--btn-primary-hover);
}

.btn.danger {
  border-color: #fca5a5;
  color: #dc2626;
  background: #fef2f2;
}

.btn.danger:hover:not(:disabled) {
  background: #fee2e2;
  border-color: #ef4444;
}

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

/* ANALYTICS */
.analytics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
}

.metric {
  background: var(--item-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}

.metric-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
}

.metric-value {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  margin-top: 5px;
}

/* LIBRARY */
.library {
  display: grid;
  gap: 12px;
}

.library-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 20px;
  background: var(--item-bg);
}

.library-title {
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
}

.library-meta {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 400;
}

/* TOP QUESTIONS */
.top-list {
  display: grid;
  gap: 8px;
}

.top-item {
  display: flex;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--item-bg);
  color: var(--text);
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 0.95rem;
}

/* PROGRESS BAR */
.progress-wrap {
  display: none;
  align-items: center;
  gap: 16px;
  margin-top: 15px;
}

.progress {
  flex: 1;
  height: 8px;
  border-radius: 999px;
  background: var(--item-bg);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width 0.4s ease;
}

.status, .helper {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* MOBILE RESPONSIVENESS */
.mobile-header {
  display: none;
  background: var(--sidebar-bg);
  padding: 15px 20px;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
}

.mobile-brand {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--accent);
}

.mobile-menu-btn {
  background: transparent;
  border: none;
  color: var(--sidebar-text);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  z-index: 95;
  opacity: 0;
  transition: opacity 0.3s ease;
}

@media (max-width: 900px) {
  .dashboard-layout {
    flex-direction: column;
  }
  
  .mobile-header {
    display: flex;
  }
  
  .sidebar {
    z-index: 100;
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .sidebar-overlay.active {
    display: block;
    opacity: 1;
  }
  
  .main-content {
    margin-left: 0;
    margin-top: 62px; /* Header height space */
    padding: 20px;
  }
  
  .page-header h1 {
    font-size: 1.6rem;
  }
  
  .analytics-grid {
    grid-template-columns: 1fr 1fr;
  }

  .table-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  
  .table-container table {
    min-width: 600px;
  }
  
  #exportCsvBtn {
    margin-top: 10px;
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .analytics-grid {
    grid-template-columns: 1fr;
  }
}