/**
 * FHIT DESIGN SYSTEM - GLOBAL STYLESHEET
 * Organization: FHIT Technology LLC (fhit.ai)
 * Usage: Include this stylesheet in any fhit.ai subdomain (e.g., student.fhit.ai, business.fhit.ai, portal.fhit.ai)
 * Compatible with plain HTML, React, Vue, Svelte, or Tailwind CSS setups.
 */

:root {
  /* Brand Primary (Emerald) */
  --fhit-primary-50: #ecfdf5;
  --fhit-primary-100: #d1fae5;
  --fhit-primary-200: #a7f3d0;
  --fhit-primary-300: #6ee7b7;
  --fhit-primary-400: #34d399;
  --fhit-primary-500: #10b981;
  --fhit-primary-600: #059669;
  --fhit-primary-700: #047857;
  --fhit-primary-800: #065f46;
  --fhit-primary-900: #064e3b;
  --fhit-primary-950: #022c22;

  /* Neutral Slate Palette */
  --fhit-slate-50: #f8fafc;
  --fhit-slate-100: #f1f5f9;
  --fhit-slate-200: #e2e8f0;
  --fhit-slate-300: #cbd5e1;
  --fhit-slate-400: #94a3b8;
  --fhit-slate-500: #64748b;
  --fhit-slate-600: #475569;
  --fhit-slate-700: #334155;
  --fhit-slate-800: #1e293b;
  --fhit-slate-900: #0f172a;
  --fhit-slate-950: #020617;

  /* Light Theme Surface & Text Variables */
  --fhit-bg-canvas: #f8fafc;
  --fhit-bg-surface: #ffffff;
  --fhit-bg-surface-elevated: #ffffff;
  --fhit-bg-muted: #f1f5f9;

  --fhit-text-primary: #0f172a;
  --fhit-text-secondary: #475569;
  --fhit-text-muted: #64748b;
  --fhit-text-inverse: #ffffff;

  --fhit-border-default: #e2e8f0;
  --fhit-border-subtle: #f1f5f9;
  --fhit-border-focus: #059669;

  /* Feedback Colors */
  --fhit-success: #059669;
  --fhit-success-bg: #ecfdf5;
  --fhit-danger: #e11d48;
  --fhit-danger-bg: #fff1f2;
  --fhit-warning: #d97706;
  --fhit-warning-bg: #fffbeb;
  --fhit-info: #0284c7;
  --fhit-info-bg: #f0f9ff;

  /* Typography */
  --fhit-font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --fhit-font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Border Radii */
  --fhit-radius-sm: 6px;
  --fhit-radius-md: 8px;
  --fhit-radius-lg: 12px;
  --fhit-radius-xl: 16px;
  --fhit-radius-2xl: 20px;
  --fhit-radius-3xl: 24px;
  --fhit-radius-full: 9999px;

  /* Shadows */
  --fhit-shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --fhit-shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.08), 0 1px 2px -1px rgba(0, 0, 0, 0.08);
  --fhit-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.06);
  --fhit-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);

  /* Transitions */
  --fhit-transition: 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode Overrides */
.dark,
[data-theme="dark"] {
  --fhit-bg-canvas: #020617;
  --fhit-bg-surface: #0f172a;
  --fhit-bg-surface-elevated: #1e293b;
  --fhit-bg-muted: #1e293b;

  --fhit-text-primary: #f8fafc;
  --fhit-text-secondary: #cbd5e1;
  --fhit-text-muted: #94a3b8;
  --fhit-text-inverse: #0f172a;

  --fhit-border-default: #1e293b;
  --fhit-border-subtle: #0f172a;
  --fhit-border-focus: #10b981;

  --fhit-success-bg: rgba(6, 78, 59, 0.25);
  --fhit-danger-bg: rgba(136, 19, 55, 0.25);
  --fhit-warning-bg: rgba(120, 53, 15, 0.25);
  --fhit-info-bg: rgba(22, 78, 99, 0.25);
}

/* Base Body Styles */
body {
  font-family: var(--fhit-font-sans);
  background-color: var(--fhit-bg-canvas);
  color: var(--fhit-text-primary);
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Focus and Selection Defaults */
::selection {
  background-color: var(--fhit-primary-600);
  color: #ffffff;
}

*, ::before, ::after {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

/* ==========================================================================
   Reusable FHIT Utility Components
   ========================================================================== */

/* Surface Containers / Cards */
.fhit-card {
  background-color: var(--fhit-bg-surface);
  border: 1px solid var(--fhit-border-default);
  border-radius: var(--fhit-radius-2xl);
  padding: 24px;
  box-shadow: var(--fhit-shadow-xs);
  transition: border-color var(--fhit-transition), box-shadow var(--fhit-transition);
}

.fhit-card-interactive:hover {
  border-color: var(--fhit-primary-500);
  box-shadow: var(--fhit-shadow-sm);
}

/* Buttons */
.fhit-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--fhit-font-sans);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  padding: 12px 20px;
  border-radius: var(--fhit-radius-xl);
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--fhit-transition);
  text-decoration: none;
}

.fhit-btn:active {
  transform: scale(0.98);
}

.fhit-btn-primary {
  background-color: var(--fhit-primary-600);
  color: #ffffff;
}

.fhit-btn-primary:hover {
  background-color: var(--fhit-primary-700);
}

.fhit-btn-dark {
  background-color: var(--fhit-slate-900);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.1);
}

.fhit-btn-dark:hover {
  background-color: var(--fhit-slate-800);
}

.fhit-btn-secondary {
  background-color: var(--fhit-bg-muted);
  color: var(--fhit-text-primary);
  border-color: var(--fhit-border-default);
}

.fhit-btn-secondary:hover {
  background-color: var(--fhit-border-default);
}

.fhit-btn-outline {
  background-color: transparent;
  color: var(--fhit-text-primary);
  border-color: var(--fhit-border-default);
}

.fhit-btn-outline:hover {
  border-color: var(--fhit-primary-500);
  color: var(--fhit-primary-600);
}

/* Form Inputs */
.fhit-input {
  width: 100%;
  font-family: var(--fhit-font-sans);
  font-size: 14px;
  padding: 12px 16px;
  border-radius: var(--fhit-radius-lg);
  border: 1px solid var(--fhit-border-default);
  background-color: var(--fhit-bg-surface);
  color: var(--fhit-text-primary);
  transition: border-color var(--fhit-transition), box-shadow var(--fhit-transition);
}

.fhit-input:focus {
  outline: none;
  border-color: var(--fhit-border-focus);
  box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.15);
}

.fhit-input::placeholder {
  color: var(--fhit-slate-400);
}

/* Typography Helpers */
.fhit-heading-1 {
  font-size: 36px;
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--fhit-text-primary);
}

.fhit-heading-2 {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--fhit-text-primary);
}

.fhit-heading-3 {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.35;
  color: var(--fhit-text-primary);
}

.fhit-body {
  font-size: 15px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--fhit-text-secondary);
}

.fhit-caption {
  font-size: 12px;
  font-weight: 500;
  color: var(--fhit-text-muted);
}