/* ==========================================================================
   Statis-Gravity: Design System
   Modern Clinical Biostatistics & Exploratory Visualization Theme
   ========================================================================== */

:root {
  /* Color Palette - Deep Clinical Dark (Default) */
  --bg-primary: #090d16;
  --bg-surface: #0f172a;
  --bg-surface-elevated: #1e293b;
  --bg-card: rgba(30, 41, 59, 0.7);
  --bg-card-hover: rgba(51, 65, 85, 0.7);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);
  --border-focus: #00d2ff;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  /* Accent Colors */
  --cyan-primary: #00d2ff;
  --cyan-glow: rgba(0, 210, 255, 0.25);
  --violet-primary: #a855f7;
  --emerald-primary: #10b981;
  --emerald-glow: rgba(16, 185, 129, 0.2);
  --amber-primary: #f59e0b;
  --rose-primary: #f43f5e;
  --rose-glow: rgba(244, 63, 94, 0.2);

  /* Shadows & Glassmorphism */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px var(--cyan-glow);
  --glass-blur: blur(12px);

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;

  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-hover: #ffffff;
  
  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.16);
  --border-focus: #0284c7;

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;

  --cyan-primary: #0284c7;
  --cyan-glow: rgba(2, 132, 199, 0.15);
  --violet-primary: #9333ea;
  --emerald-primary: #059669;
  --emerald-glow: rgba(5, 150, 105, 0.15);
  --amber-primary: #d97706;
  --rose-primary: #e11d48;
  --rose-glow: rgba(225, 29, 72, 0.15);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.1);
}

/* Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Layout Container */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Global App Header */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.75rem;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: var(--glass-blur);
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-icon {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--cyan-primary), var(--violet-primary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 800;
  font-size: 1.1rem;
  box-shadow: 0 0 12px var(--cyan-glow);
}

.brand-info h1 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, var(--text-main), var(--cyan-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-info p {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

/* Button & Interactive Utility */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  text-decoration: none;
  font-family: inherit;
}

.btn-primary {
  background: linear-gradient(135deg, var(--cyan-primary), #0284c7);
  color: #ffffff;
  box-shadow: 0 2px 8px var(--cyan-glow);
}

.btn-primary:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-surface-elevated);
  color: var(--text-main);
  border-color: var(--border-subtle);
}

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

.btn-sm {
  padding: 0.3rem 0.6rem;
  font-size: 0.75rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.5rem;
  border-radius: 9999px;
  font-size: 0.72rem;
  font-weight: 600;
}

.badge-sig {
  background-color: var(--emerald-glow);
  color: var(--emerald-primary);
  border: 1px solid var(--emerald-primary);
}

.badge-ns {
  background-color: rgba(148, 163, 184, 0.15);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
}

.badge-warning {
  background-color: rgba(245, 158, 11, 0.15);
  color: #f59e0b;
  border: 1px solid #f59e0b;
}

.badge-danger {
  background-color: rgba(244, 63, 94, 0.15);
  color: #f43f5e;
  border: 1px solid #f43f5e;
}