/* -------------  Color system ------------- */
:root {
  --bg-gradient: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #24243e 100%);
  --glass-bg: rgba(255, 255, 255, 0.07);
  --glass-border: rgba(255, 255, 255, 0.1);
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --success: #10b981;
  --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

/* -------------  Navbar ------------- */
.navbar .navbar-brand,
.navbar-expand-lg .navbar-brand {
  color: var(--text-primary) !important;
  text-decoration: none !important;
  transition: color 0.3s ease;
}

.navbar .navbar-brand:hover,
.navbar .navbar-brand:focus,
.navbar-expand-lg .navbar-brand:hover,
.navbar-expand-lg .navbar-brand:focus {
  color: var(--text-primary) !important;
  text-decoration: none !important;
}

.navbar .navbar-brand span,
.navbar-brand .fw-bold,
.navbar-expand-lg .navbar-brand span,
.navbar-expand-lg .navbar-brand .fw-bold {
  color: var(--text-primary) !important;
}

.navbar .nav-link,
.navbar-expand-lg .nav-link {
  color: var(--text-secondary) !important;
  font-weight: 500;
  transition: color 0.3s ease;
}

.navbar .nav-link:hover,
.navbar .nav-link:focus,
.navbar-expand-lg .nav-link:hover,
.navbar-expand-lg .nav-link:focus {
  color: var(--text-primary) !important;
}

/* Force navbar brand text to be white - aggressive approach */
.navbar-brand,
.navbar-brand *,
a.navbar-brand,
a.navbar-brand *,
.navbar .navbar-brand,
.navbar .navbar-brand *,
.navbar-expand-lg .navbar-brand,
.navbar-expand-lg .navbar-brand * {
  color: #ffffff !important;
}

/* -------------  Global ------------- */
html, body {
  height: 100%;
  scroll-behavior: smooth;
}

body {
  background: var(--bg-gradient) fixed;
  color: var(--text-primary);
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  display: flex;
  flex-direction: column;
  letter-spacing: -0.01em;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  letter-spacing: -0.03em;
}

.display-4 {
  font-weight: 800;
  margin-bottom: 1.5rem;
  background: linear-gradient(to right, #fff, rgba(255, 255, 255, 0.7));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.lead {
  font-weight: 400;
  color: var(--text-secondary);
  font-size: 1.2rem;
  line-height: 1.6;
}

.btn {
  border-radius: 12px;
  padding: 0.7rem 1.5rem;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn-accent {
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  border: none;
  color: #fff;
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.3);
  color: white;
}

.btn-accent:active {
  transform: translateY(1px);
}

.btn-lg {
  font-size: 1.05rem;
  padding: 0.8rem 1.8rem;
}

/* -------------  Glass card ------------- */
.glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--card-shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

/* Glass alert for dashboard */
.glass-alert {
  background: rgba(13, 202, 240, 0.1);
  border: 1px solid rgba(13, 202, 240, 0.2);
  border-radius: 16px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

/* -------------  Drop area ------------- */
#drop-area {
  min-height: 180px;
  border: 2px dashed rgba(255, 255, 255, 0.15);
  border-radius: 20px;
  transition: all 0.3s ease;
  padding: 2rem;
  background: rgba(255, 255, 255, 0.03);
}

#drop-area.is-dragover {
  border-color: var(--accent);
  background: rgba(99, 102, 241, 0.08);
  transform: scale(1.02);
}

#drop-area.file-uploaded {
  border-color: var(--success);
  background: rgba(16, 185, 129, 0.08);
}

#drop-area p {
  color: var(--text-secondary);
  font-weight: 500;
  margin-top: 0.5rem;
  transition: color 0.25s ease;
}

#drop-area.file-uploaded p {
  color: var(--success);
  font-weight: 600;
}

.upload-icon, .success-icon {
  margin-bottom: 1rem;
  font-size: 3rem;
  opacity: 0.7;
  transition: all 0.3s ease;
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
}

.success-icon {
  color: var(--success);
  opacity: 0.9;
  display: none;
}

#drop-area.file-uploaded .upload-icon {
  display: none;
}

#drop-area.file-uploaded .success-icon {
  display: block;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

/* Make radio fields row‑like */
.choice-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.form-check {
  margin: 0;
}

.btn-choice {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  color: var(--text-secondary);
  padding: 0.7rem 1.25rem;
  font-weight: 500;
  transition: all 0.2s ease;
  cursor: pointer;
}

.btn-choice:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.btn-check:checked + .btn-choice {
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  border-color: transparent;
  color: #fff;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

/* -------------  Progress bar ------------- */
.progress {
  overflow: hidden;
  height: 0.8rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 100px;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.2);
}

.bg-accent {
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  background-size: 200% 100%;
  animation: gradient-shift 2s linear infinite;
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
}

@keyframes gradient-shift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* -------------  Alert styling ------------- */
.alert {
  border-radius: 16px;
  padding: 1rem 1.5rem;
}

/* -------------  Result page styling ------------- */
.result-icon {
  font-size: 5rem;
  margin-bottom: 1.5rem;
  color: var(--accent);
  filter: drop-shadow(0 4px 12px rgba(99, 102, 241, 0.4));
}

/* Media queries for better responsive design */
@media (max-width: 768px) {
  .display-4 {
    font-size: 2.5rem;
  }
  
  .lead {
    font-size: 1rem;
  }
  
  .glass {
    padding: 1.5rem !important;
  }
}