/* styles.css - Modern Blue, Purple & Pink Gradient Design System */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Fira+Code:wght@400;500&display=swap');

:root {
  --blue-primary: #2563eb;
  --blue-light: #60a5fa;
  --purple-primary: #7c3aed;
  --purple-light: #c084fc;
  --pink-primary: #ec4899;
  --pink-light: #f472b6;
  --dark-bg: #0f172a;
  --dark-surface: #1e1b4b;
  --gradient-main: linear-gradient(135deg, #2563eb 0%, #7c3aed 50%, #ec4899 100%);
  --gradient-text: linear-gradient(90deg, #60a5fa 0%, #c084fc 50%, #f472b6 100%);
  --gradient-banner: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #31103f 100%);
  --card-bg: #ffffff;
  --text-main: #334155;
  --text-heading: #0f172a;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  color: var(--text-main);
  line-height: 1.65;
  background-color: #f8fafc;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  color: var(--text-heading);
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.75rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid #e2e8f0;
  position: relative;
}

h2::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 60px;
  height: 3px;
  background: var(--gradient-main);
  border-radius: 2px;
}

/* Navbar Styling */
.navbar {
  background: var(--gradient-banner) !important;
  box-shadow: 0 6px 24px rgba(124, 58, 237, 0.2);
  padding: 0.9rem 1.8rem;
  border-bottom: 1px solid rgba(236, 72, 153, 0.2);
}

.navbar-brand {
  font-weight: 800;
  font-size: 1.3rem;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.01em;
}

.navbar-nav .nav-link {
  color: #e2e8f0 !important;
  font-weight: 500;
  transition: all 0.25s ease-in-out;
  padding: 0.5rem 1.1rem !important;
  border-radius: 8px;
  margin: 0 0.2rem;
}

.navbar-nav .nav-link:hover {
  color: #ffffff !important;
  background: rgba(236, 72, 153, 0.15);
  transform: translateY(-1px);
}

.navbar-nav .nav-link.active {
  color: #ffffff !important;
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.8), rgba(236, 72, 153, 0.8));
  box-shadow: 0 4px 12px rgba(236, 72, 153, 0.3);
}

/* Hero Banner Section */
.hero-banner {
  background: var(--gradient-banner);
  color: white;
  padding: 3.5rem 2.5rem;
  border-radius: 20px;
  margin-bottom: 2.5rem;
  border: 1px solid rgba(236, 72, 153, 0.25);
  box-shadow: 0 16px 40px rgba(30, 27, 75, 0.35);
  position: relative;
  overflow: hidden;
}

.hero-banner::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(236, 72, 153, 0.15) 0%, rgba(124, 58, 237, 0) 70%);
  pointer-events: none;
}

.hero-banner h1 {
  font-size: 2.6rem;
  font-weight: 800;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.8rem;
  letter-spacing: -0.03em;
}

.hero-banner h3,
.hero-banner .hero-subtitle {
  font-size: 1.25rem;
  color: #cbd5e1;
  font-weight: 400;
  max-width: 850px;
  line-height: 1.5;
  margin-top: 0.5rem;
  margin-bottom: 0;
}

/* Callout Box Customization */
.callout {
  border-radius: 14px !important;
  border-left-width: 6px !important;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.05);
  margin: 1.8rem 0;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.callout:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.08);
}

.callout-note {
  background-color: #f0f6ff !important;
  border-left-color: var(--blue-primary) !important;
}

.callout-note .callout-header {
  color: #1e40af !important;
}

.callout-tip {
  background-color: #f5f3ff !important;
  border-left-color: var(--purple-primary) !important;
}

.callout-tip .callout-header {
  color: #5b21b6 !important;
}

.callout-important {
  background-color: #fdf2f8 !important;
  border-left-color: var(--pink-primary) !important;
}

.callout-important .callout-header {
  color: #9d174d !important;
}

/* Table Styling */
table, .table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 1.8rem 0;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  border: 1px solid #e2e8f0;
}

th, table th, .table th, .table thead th, .table > thead > tr > th {
  background: var(--gradient-banner) !important;
  color: #f8fafc !important;
  font-weight: 700 !important;
  text-align: left;
  padding: 0.95rem 1.2rem;
  letter-spacing: 0.01em;
}

td {
  padding: 0.85rem 1.2rem;
  border-bottom: 1px solid #f1f5f9;
  background-color: #ffffff;
  color: #334155;
}

tr:nth-child(even) td {
  background-color: #f8fafc;
}

tr:hover td {
  background-color: #f1f5f9;
}

/* Figure & Plot Framing */
.cell-output-display img {
  border-radius: 14px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
  border: 1px solid #e2e8f0;
  margin: 1rem 0;
  transition: transform 0.2s ease;
}

.cell-output-display img:hover {
  transform: scale(1.005);
}

/* Footer Styling */
footer {
  margin-top: 4rem;
  padding: 2.5rem 0;
  border-top: 2px solid;
  border-image: var(--gradient-main) 1;
  color: #64748b;
  font-size: 0.92rem;
  text-align: center;
}

/* Overview Animated Graphic Card */
.overview-graphic-card {
  background: #ffffff;
  border-radius: 16px;
  padding: 1.8rem;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  border: 1px solid #e2e8f0;
  margin-top: 1rem;
  margin-bottom: 2.5rem;
  transition: box-shadow 0.3s ease;
}

.overview-graphic-card:hover {
  box-shadow: 0 16px 36px rgba(124, 58, 237, 0.12);
}

.overview-graphic-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.overview-graphic-badge {
  background: var(--gradient-main);
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.3rem 0.75rem;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}