/**
 * Techackode Enterprise UI Design System
 * 
 * Design Philosophy: Clean • Trustworthy • Modern • Minimal • Enterprise-ready
 * Inspired by: Microsoft Fluent, Google Material, IBM Carbon
 * 
 * Brand Identity: Security-focused, professional, reliable
 * 
 * LOGO COLOR INTEGRATION (Subtle & Intentional):
 * - Deep Navy Blue (#0F2A3F - #142F44): From logo shield - Security & Trust
 *   Usage: Focus states, active navigation, trust indicators, subtle accents
 * 
 * - Soft Steel/Silver (#BFC7CE - #D1D7DC): From logo sword - Precision & Clarity
 *   Usage: Dividers, icon backgrounds, subtle UI hints, secondary accents
 * 
 * Logo colors are NEVER overwhelming fills - always used as subtle accents
 * that enhance readability and communicate security/trust without distraction.
 * 
 * Version: 1.1.0
 * Last Updated: 2025
 */

/* ============================================
   DESIGN TOKENS - FOUNDATION
   ============================================ */

:root {
  /* ===== COLOR SYSTEM ===== */
  /* Primary UI Color - Enterprise Blue */
  --color-primary: #0078D4;
  --color-primary-hover: #005A9E;
  --color-primary-active: #004578;
  --color-primary-light: #E6F2FA;
  --color-primary-dark: #004578;

  /* Logo Brand Colors - Used Subtly as Accents */
  /* Deep Navy Blue (from logo shield) - Security & Trust */
  --color-logo-navy: #0F2A3F;
  --color-logo-navy-light: #142F44;
  --color-logo-navy-subtle: rgba(15, 42, 63, 0.08);
  --color-logo-navy-accent: rgba(15, 42, 63, 0.12);
  
  /* Soft Steel / Silver (from logo sword) - Precision & Clarity */
  --color-logo-steel: #BFC7CE;
  --color-logo-steel-light: #D1D7DC;
  --color-logo-steel-subtle: rgba(191, 199, 206, 0.3);
  --color-logo-steel-accent: rgba(191, 199, 206, 0.5);

  /* Text Colors */
  --color-text-primary: #1b1b1b;
  --color-text-secondary: #5f5f5f;
  --color-text-tertiary: #8a8a8a;
  --color-text-muted: #8a8a8a;
  --color-text-inverse: #ffffff;
  --color-text-link: #0078D4;
  --color-text-link-hover: #005A9E;

  /* Background Colors */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f5f5f5;
  --color-bg-tertiary: #fafafa;
  --color-bg-overlay: rgba(0, 0, 0, 0.5);
  --color-bg-card: #ffffff;

  /* Border & Divider Colors */
  --color-border-primary: #e1e1e1;
  --color-border-secondary: #d1d1d1;
  --color-border-focus: #0078D4;
  --color-border-focus-navy: #0F2A3F; /* Navy focus for security emphasis */
  --color-divider: #e1e1e1;
  --color-divider-steel: #D1D7DC; /* Steel-toned divider for brand identity */

  /* Status Colors */
  --color-success: #107C10;
  --color-success-bg: #E6F7E6;
  --color-warning: #FF8C00;
  --color-warning-bg: #FFF4E6;
  --color-error: #D13438;
  --color-error-bg: #FDE7E7;
  --color-info: #0078D4;
  --color-info-bg: #E6F2FA;
  
  /* Security & Trust Indicators (using logo navy subtly) */
  --color-trust-indicator: var(--color-logo-navy-subtle);
  --color-security-accent: var(--color-logo-navy-light);

  /* ===== TYPOGRAPHY ===== */
  /* Font Stack - Enterprise Standard */
  --font-family-primary: "Segoe UI", "Segoe", "Roboto", "Helvetica Neue", Arial, sans-serif;
  --font-family-heading: "Segoe UI", "Segoe", "Roboto", "Helvetica Neue", Arial, sans-serif;
  --font-family-mono: "Consolas", "Monaco", "Courier New", monospace;

  /* Font Sizes - Scale System */
  --font-size-xs: 0.75rem;      /* 12px */
  --font-size-sm: 0.875rem;     /* 14px */
  --font-size-base: 1rem;       /* 16px */
  --font-size-md: 1.125rem;     /* 18px */
  --font-size-lg: 1.25rem;      /* 20px */
  --font-size-xl: 1.5rem;       /* 24px */
  --font-size-2xl: 1.875rem;     /* 30px */
  --font-size-3xl: 2.25rem;     /* 36px */
  --font-size-4xl: 3rem;        /* 48px */

  /* Font Weights */
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Line Heights */
  --line-height-tight: 1.2;
  --line-height-normal: 1.4;
  --line-height-relaxed: 1.6;
  --line-height-loose: 1.8;

  /* Letter Spacing */
  --letter-spacing-tight: -0.01em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.02em;

  /* ===== SPACING SYSTEM - 8px Base ===== */
  --spacing-0: 0;
  --spacing-1: 0.25rem;   /* 4px */
  --spacing-2: 0.5rem;    /* 8px */
  --spacing-3: 0.75rem;   /* 12px */
  --spacing-4: 1rem;      /* 16px */
  --spacing-5: 1.25rem;   /* 20px */
  --spacing-6: 1.5rem;    /* 24px */
  --spacing-8: 2rem;      /* 32px */
  --spacing-10: 2.5rem;   /* 40px */
  --spacing-12: 3rem;     /* 48px */
  --spacing-16: 4rem;     /* 64px */
  --spacing-20: 5rem;     /* 80px */
  --spacing-24: 6rem;     /* 96px */

  /* ===== BORDER RADIUS ===== */
  --radius-none: 0;
  --radius-sm: 2px;
  --radius-base: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-full: 9999px;

  /* ===== SHADOWS ===== */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-none: none;

  /* ===== TRANSITIONS ===== */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-all: all var(--transition-base);

  /* ===== LAYOUT ===== */
  --container-max-width: 1320px;
  --container-padding: var(--spacing-4);
  --grid-columns: 12;
  --grid-gap: var(--spacing-6);

  /* ===== Z-INDEX SCALE ===== */
  --z-index-base: 1;
  --z-index-dropdown: 100;
  --z-index-sticky: 200;
  --z-index-fixed: 300;
  --z-index-modal-backdrop: 400;
  --z-index-modal: 500;
  --z-index-popover: 600;
  --z-index-tooltip: 700;

  /* ===== BREAKPOINTS ===== */
  --breakpoint-sm: 576px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 992px;
  --breakpoint-xl: 1200px;
  --breakpoint-xxl: 1400px;
}

/* ============================================
   GLOBAL RESETS & BASE STYLES
   ============================================ */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  margin: 0;
  padding: 0;
}

/* ============================================
   TYPOGRAPHY SYSTEM
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-text-primary);
  margin: 0 0 var(--spacing-4) 0;
  letter-spacing: var(--letter-spacing-tight);
}

h1 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
}

h2 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-semibold);
}

h3 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
}

h4 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
}

h5 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
}

h6 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
}

p {
  margin: 0 0 var(--spacing-4) 0;
  line-height: var(--line-height-relaxed);
}

a {
  color: var(--color-text-link);
  text-decoration: none;
  transition: var(--transition-fast);
}

a:hover,
a:focus {
  color: var(--color-text-link-hover);
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
  border-radius: var(--radius-base);
}

/* ============================================
   BUTTON SYSTEM
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-6);
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  vertical-align: middle;
  cursor: pointer;
  user-select: none;
  border: 1px solid transparent;
  border-radius: var(--radius-base);
  transition: var(--transition-all);
  min-height: 40px;
}

.btn:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

.btn:disabled,
.btn.disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

/* Primary Button */
.btn-primary,
.btn.btn-primary {
  color: var(--color-text-inverse);
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  box-shadow: 0 1px 2px rgba(0, 120, 212, 0.2);
}

.btn-primary:hover,
.btn.btn-primary:hover {
  color: var(--color-text-inverse);
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  text-decoration: none;
  box-shadow: 0 2px 4px rgba(0, 120, 212, 0.25);
}

.btn-primary:active,
.btn.btn-primary:active {
  background-color: var(--color-primary-active);
  border-color: var(--color-primary-active);
  box-shadow: 0 1px 2px rgba(0, 120, 212, 0.2);
}

.btn-primary:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(0, 120, 212, 0.15);
}

/* Secondary Button */
.btn-secondary,
.btn.btn-secondary {
  color: var(--color-primary);
  background-color: transparent;
  border-color: var(--color-primary);
}

.btn-secondary:hover,
.btn.btn-secondary:hover {
  color: var(--color-text-inverse);
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  text-decoration: none;
}

/* Trust/Security Button - Subtle Navy Accent */
.btn-trust,
.btn.btn-trust {
  color: var(--color-logo-navy);
  background-color: transparent;
  border-color: var(--color-logo-navy-light);
  border-width: 1.5px;
}

.btn-trust:hover,
.btn.btn-trust:hover {
  color: var(--color-text-inverse);
  background-color: var(--color-logo-navy);
  border-color: var(--color-logo-navy);
  text-decoration: none;
}

/* Outline Button */
.btn-outline-primary,
.btn.btn-outline-primary {
  color: var(--color-primary);
  background-color: transparent;
  border-color: var(--color-border-primary);
}

.btn-outline-primary:hover,
.btn.btn-outline-primary:hover {
  color: var(--color-primary-hover);
  background-color: var(--color-bg-secondary);
  border-color: var(--color-primary-hover);
  text-decoration: none;
}

/* Button Sizes */
.btn-sm {
  padding: var(--spacing-2) var(--spacing-4);
  font-size: var(--font-size-sm);
  min-height: 32px;
}

.btn-lg {
  padding: var(--spacing-4) var(--spacing-8);
  font-size: var(--font-size-lg);
  min-height: 48px;
}

/* ============================================
   CARD SYSTEM
   ============================================ */

.card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: var(--transition-all);
  position: relative;
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-secondary);
}

/* Card with subtle logo navy accent on hover */
.card.card-trust:hover {
  border-top: 2px solid var(--color-logo-navy-light);
  box-shadow: var(--shadow-md), 0 -2px 0 var(--color-logo-navy-subtle);
}

.card-header {
  padding: var(--spacing-6);
  border-bottom: 1px solid var(--color-divider-steel);
  background-color: var(--color-bg-secondary);
}

.card-body {
  padding: var(--spacing-6);
  flex: 1 1 auto;
}

.card-footer {
  padding: var(--spacing-6);
  border-top: 1px solid var(--color-divider);
  background-color: var(--color-bg-secondary);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin: 0 0 var(--spacing-2) 0;
  color: var(--color-text-primary);
}

.card-text {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin: 0;
}

/* ============================================
   FORM SYSTEM
   ============================================ */

.form-group {
  margin-bottom: var(--spacing-4);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-2);
}

.form-control {
  display: block;
  width: 100%;
  padding: var(--spacing-3) var(--spacing-4);
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-base);
  transition: var(--transition-all);
  min-height: 40px;
}

.form-control:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px rgba(0, 120, 212, 0.1);
}

/* Trust-focused form inputs - subtle navy accent */
.form-control.form-trust:focus {
  border-color: var(--color-border-focus-navy);
  box-shadow: 0 0 0 3px var(--color-logo-navy-subtle);
}

.form-control:disabled {
  background-color: var(--color-bg-secondary);
  cursor: not-allowed;
  opacity: 0.6;
}

.form-control::placeholder {
  color: var(--color-text-tertiary);
}

.input-group {
  display: flex;
  align-items: stretch;
  width: 100%;
}

.input-group-text {
  display: flex;
  align-items: center;
  padding: var(--spacing-3) var(--spacing-4);
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border-primary);
  border-right: none;
  border-radius: var(--radius-base) 0 0 var(--radius-base);
}

.input-group .form-control {
  border-left: none;
  border-radius: 0 var(--radius-base) var(--radius-base) 0;
}

.input-group .form-control:focus {
  border-left: 1px solid var(--color-border-focus);
}

/* Form Validation States */
.form-control.is-valid {
  border-color: var(--color-success);
}

.form-control.is-invalid {
  border-color: var(--color-error);
}

.form-feedback {
  display: block;
  margin-top: var(--spacing-1);
  font-size: var(--font-size-sm);
}

.form-feedback.valid-feedback {
  color: var(--color-success);
}

.form-feedback.invalid-feedback {
  color: var(--color-error);
}

/* ============================================
   NAVIGATION SYSTEM
   ============================================ */

.navbar {
  background-color: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-divider);
  padding: var(--spacing-4) 0;
  transition: var(--transition-all);
}

.navbar.scrolled {
  box-shadow: var(--shadow-sm);
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
}

.nav-link {
  display: flex;
  align-items: center;
  padding: var(--spacing-2) var(--spacing-4);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: var(--transition-fast);
  border-radius: var(--radius-base);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
  text-decoration: none;
}

/* Navigation with logo navy underline for active state */
.nav-link.nav-trust.active {
  color: var(--color-logo-navy);
  background-color: transparent;
  border-bottom: 2px solid var(--color-logo-navy-light);
  padding-bottom: calc(var(--spacing-2) - 2px);
}

.nav-link.nav-trust:hover {
  color: var(--color-logo-navy);
  background-color: var(--color-logo-navy-subtle);
}

.nav-link:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

/* Spacing Utilities */
.mt-0 { margin-top: var(--spacing-0) !important; }
.mt-1 { margin-top: var(--spacing-1) !important; }
.mt-2 { margin-top: var(--spacing-2) !important; }
.mt-3 { margin-top: var(--spacing-3) !important; }
.mt-4 { margin-top: var(--spacing-4) !important; }
.mt-6 { margin-top: var(--spacing-6) !important; }
.mt-8 { margin-top: var(--spacing-8) !important; }

.mb-0 { margin-bottom: var(--spacing-0) !important; }
.mb-1 { margin-bottom: var(--spacing-1) !important; }
.mb-2 { margin-bottom: var(--spacing-2) !important; }
.mb-3 { margin-bottom: var(--spacing-3) !important; }
.mb-4 { margin-bottom: var(--spacing-4) !important; }
.mb-6 { margin-bottom: var(--spacing-6) !important; }
.mb-8 { margin-bottom: var(--spacing-8) !important; }

.pt-0 { padding-top: var(--spacing-0) !important; }
.pt-1 { padding-top: var(--spacing-1) !important; }
.pt-2 { padding-top: var(--spacing-2) !important; }
.pt-3 { padding-top: var(--spacing-3) !important; }
.pt-4 { padding-top: var(--spacing-4) !important; }
.pt-6 { padding-top: var(--spacing-6) !important; }
.pt-8 { padding-top: var(--spacing-8) !important; }

.pb-0 { padding-bottom: var(--spacing-0) !important; }
.pb-1 { padding-bottom: var(--spacing-1) !important; }
.pb-2 { padding-bottom: var(--spacing-2) !important; }
.pb-3 { padding-bottom: var(--spacing-3) !important; }
.pb-4 { padding-bottom: var(--spacing-4) !important; }
.pb-6 { padding-bottom: var(--spacing-6) !important; }
.pb-8 { padding-bottom: var(--spacing-8) !important; }

/* Text Utilities */
.text-primary { color: var(--color-text-primary) !important; }
.text-secondary { color: var(--color-text-secondary) !important; }
.text-tertiary { color: var(--color-text-tertiary) !important; }
.text-muted { color: var(--color-text-muted) !important; }
.text-link { color: var(--color-text-link) !important; }
.text-navy { color: var(--color-logo-navy) !important; }
.text-steel { color: var(--color-logo-steel) !important; }

.text-center { text-align: center !important; }
.text-left { text-align: left !important; }
.text-right { text-align: right !important; }

.font-weight-regular { font-weight: var(--font-weight-regular) !important; }
.font-weight-medium { font-weight: var(--font-weight-medium) !important; }
.font-weight-semibold { font-weight: var(--font-weight-semibold) !important; }
.font-weight-bold { font-weight: var(--font-weight-bold) !important; }

/* Background Utilities */
.bg-primary { background-color: var(--color-bg-primary) !important; }
.bg-secondary { background-color: var(--color-bg-secondary) !important; }
.bg-tertiary { background-color: var(--color-bg-tertiary) !important; }
.bg-navy-subtle { background-color: var(--color-logo-navy-subtle) !important; }
.bg-steel-subtle { background-color: var(--color-logo-steel-subtle) !important; }

/* Border Utilities */
.border { border: 1px solid var(--color-border-primary) !important; }
.border-top { border-top: 1px solid var(--color-border-primary) !important; }
.border-bottom { border-bottom: 1px solid var(--color-border-primary) !important; }
.border-navy { border-color: var(--color-logo-navy-light) !important; }
.border-steel { border-color: var(--color-divider-steel) !important; }
.border-radius { border-radius: var(--radius-base) !important; }
.border-radius-lg { border-radius: var(--radius-lg) !important; }

/* Divider Utilities */
.divider { border-top: 1px solid var(--color-divider) !important; }
.divider-steel { border-top: 1px solid var(--color-divider-steel) !important; }
.divider-navy { border-top: 1px solid var(--color-logo-navy-subtle) !important; }

/* Display Utilities */
.d-flex { display: flex !important; }
.d-block { display: block !important; }
.d-inline-block { display: inline-block !important; }
.d-none { display: none !important; }

.align-items-center { align-items: center !important; }
.justify-content-center { justify-content: center !important; }
.justify-content-between { justify-content: space-between !important; }

/* ============================================
   ACCESSIBILITY
   ============================================ */

/* Focus Visible - Enhanced for accessibility */
*:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

/* Skip to content link */
.skip-to-content {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--spacing-2) var(--spacing-4);
  z-index: var(--z-index-tooltip);
  text-decoration: none;
}

.skip-to-content:focus {
  top: 0;
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ============================================
   RESPONSIVE UTILITIES
   ============================================ */

@media (max-width: 768px) {
  :root {
    --font-size-4xl: 2.25rem;  /* 36px */
    --font-size-3xl: 1.875rem; /* 30px */
    --font-size-2xl: 1.5rem;   /* 24px */
  }
  
  .container {
    padding-left: var(--spacing-4);
    padding-right: var(--spacing-4);
  }
}