/* ========================================================================
   Variables
   ======================================================================== */
:root {
  /* Color Palette - tuned for professional security / corporate feel */
  --color-background: #05070c; /* deep slate/navy */
  --color-surface: #0b1018;
  --color-surface-alt: #111827;
  --color-text: #f9fafb;
  --color-text-muted: #9ca3af;

  --color-primary: #1d4ed8; /* strong, trustworthy blue */
  --color-primary-soft: #1d4ed814;
  --color-primary-strong: #1e40af;
  --color-success: #16a34a;
  --color-warning: #f59e0b;
  --color-danger: #dc2626;

  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2933;
  --gray-900: #111827;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-heading: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, "Helvetica Neue", Arial, sans-serif;

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

  --line-height-tight: 1.2;
  --line-height-snug: 1.35;
  --line-height-normal: 1.6;

  /* Spacing scale (0–96px) */
  --space-0: 0;
  --space-1: 0.25rem;  /* 4px */
  --space-2: 0.5rem;   /* 8px */
  --space-3: 0.75rem;  /* 12px */
  --space-4: 1rem;     /* 16px */
  --space-5: 1.25rem;  /* 20px */
  --space-6: 1.5rem;   /* 24px */
  --space-8: 2rem;     /* 32px */
  --space-10: 2.5rem;  /* 40px */
  --space-12: 3rem;    /* 48px */
  --space-16: 4rem;    /* 64px */
  --space-20: 5rem;    /* 80px */
  --space-24: 6rem;    /* 96px */

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-pill: 999px;

  /* Shadows (subtle but present for depth / security feel) */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 20px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 18px 45px rgba(0, 0, 0, 0.45);

  /* Transitions */
  --transition-fast: 120ms ease-out;
  --transition-base: 180ms ease-out;
  --transition-slow: 250ms ease-out;
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0ms;
    --transition-base: 0ms;
    --transition-slow: 0ms;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* ========================================================================
   Reset / Normalize
   ======================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  text-size-adjust: 100%;
}

body,
h1,
h2,
h3,
h4,
h5,
h6,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

ul[role="list"],
ol[role="list"] {
  list-style: none;
  margin: 0;
  padding: 0;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

input,
button,
textarea,
select {
  font: inherit;
}

button {
  border: none;
  padding: 0;
  background: none;
}

/* Remove animations/transitions for people who prefer reduced motion (already set vars) */

/* ========================================================================
   Base Styles
   ======================================================================== */
body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
}

main {
  display: block;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: var(--line-height-tight);
  color: var(--gray-50);
  margin-bottom: var(--space-3);
}

h1 {
  font-size: clamp(2.25rem, 3vw, 2.75rem);
}

h2 {
  font-size: clamp(1.875rem, 2.4vw, 2.25rem);
}

h3 {
  font-size: clamp(1.5rem, 2vw, 1.75rem);
}

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

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

h6 {
  font-size: var(--font-size-base);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

p {
  margin-bottom: var(--space-3);
  color: var(--color-text-muted);
}

strong,
b {
  font-weight: 600;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-base), opacity var(--transition-base);
}

a:hover {
  color: var(--color-primary-strong);
}

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

hr {
  border: none;
  border-top: 1px solid var(--gray-800);
  margin: var(--space-8) 0;
}

/* ========================================================================
   Accessibility & Focus States
   ======================================================================== */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

/* Visually hidden but accessible to screen readers */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ========================================================================
   Utilities
   ======================================================================== */

/* Layout helpers */
.container {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
  max-width: 72rem; /* 1152px - good for corporate layout */
}

.section {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
}

.section--tight {
  padding-top: var(--space-10);
  padding-bottom: var(--space-10);
}

.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

/* Flex utilities */
.flex {
  display: flex;
}

.inline-flex {
  display: inline-flex;
}

.flex-col {
  flex-direction: column;
}

.flex-row {
  flex-direction: row;
}

.flex-wrap {
  flex-wrap: wrap;
}

.items-center {
  align-items: center;
}

.items-start {
  align-items: flex-start;
}

.items-end {
  align-items: flex-end;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.justify-end {
  justify-content: flex-end;
}

.gap-4 {
  gap: var(--space-4);
}

.gap-6 {
  gap: var(--space-6);
}

.gap-8 {
  gap: var(--space-8);
}

/* Grid utilities */
.grid {
  display: grid;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-8);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-8);
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Spacing utilities (vertical rhythm helpers) */
.stack-sm > * + * {
  margin-top: var(--space-2);
}

.stack-md > * + * {
  margin-top: var(--space-4);
}

.stack-lg > * + * {
  margin-top: var(--space-6);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-pill);
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background-color: var(--gray-900);
  color: var(--gray-200);
}

/* ========================================================================
   Components
   ======================================================================== */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.5rem;
  border-radius: var(--radius-pill);
  font-size: var(--font-size-sm);
  font-weight: 500;
  line-height: 1.2;
  cursor: pointer;
  border: 1px solid transparent;
  transition:
    background-color var(--transition-base),
    color var(--transition-base),
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-fast);
}

.btn-primary {
  background: linear-gradient(135deg, #1d4ed8, #0f172a);
  color: #f9fafb;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
  background: linear-gradient(135deg, #1e40af, #020617);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-text);
  border-color: var(--gray-700);
}

.btn-outline:hover {
  background-color: var(--gray-900);
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-text);
}

.btn-ghost:hover {
  background-color: rgba(15, 23, 42, 0.9);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

/* Form Inputs */
.input,
select,
textarea {
  width: 100%;
  padding: 0.625rem 0.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-700);
  background-color: #020617;
  color: var(--color-text);
  font-size: var(--font-size-sm);
  line-height: 1.4;
  transition:
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    background-color var(--transition-base);
}

.input::placeholder,
textarea::placeholder {
  color: var(--gray-500);
}

.input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary-soft);
}

.input[aria-invalid="true"],
.input--error {
  border-color: var(--color-danger);
}

label {
  display: block;
  margin-bottom: var(--space-1);
  font-size: var(--font-size-sm);
  color: var(--gray-200);
}

.form-row {
  margin-bottom: var(--space-4);
}

/* Cards - for services, case studies, testimonials */
.card {
  background: radial-gradient(circle at top left, #111827, #020617);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(31, 41, 55, 0.9);
}

.card--subtle {
  background: #020617;
  border-color: var(--gray-800);
  box-shadow: var(--shadow-sm);
}

.card-header {
  margin-bottom: var(--space-3);
}

.card-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-1);
}

.card-meta {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray-400);
}

.card-body {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* Hero-specific helper (for consistent look) */
.hero {
  padding-top: clamp(5rem, 8vh, 7rem);
  padding-bottom: clamp(4rem, 7vh, 6rem);
}

.hero-title {
  font-size: clamp(2.5rem, 4vw, 3rem);
}

.hero-subtitle {
  max-width: 36rem;
  font-size: var(--font-size-lg);
}

/* Simple tag row for service badges */
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  padding: 0.125rem 0.625rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--gray-800);
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray-300);
}

/* Tables (for service standards / SIC / pricing summaries) */
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}

.table th,
.table td {
  padding: 0.75rem 0.75rem;
  border-bottom: 1px solid var(--gray-800);
}

.table th {
  text-align: left;
  font-weight: 500;
  color: var(--gray-200);
  background-color: #020617;
}

.table tbody tr:nth-child(even) {
  background-color: rgba(15, 23, 42, 0.65);
}

/* Alerts (for compliance / standards notices) */
.alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-size: var(--font-size-sm);
}

.alert--info {
  border-color: var(--color-primary-soft);
  background-color: rgba(37, 99, 235, 0.12);
}

.alert--success {
  border-color: rgba(34, 197, 94, 0.4);
  background-color: rgba(22, 163, 74, 0.12);
}

.alert--warning {
  border-color: rgba(245, 158, 11, 0.4);
  background-color: rgba(245, 158, 11, 0.12);
}

.alert--danger {
  border-color: rgba(220, 38, 38, 0.4);
  background-color: rgba(220, 38, 38, 0.12);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--gray-800);
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
  background: #020617;
}

.site-footer p {
  color: var(--gray-500);
}

/* ========================================================================
   Responsive Tweaks
   ======================================================================== */
@media (max-width: 640px) {
  .section {
    padding-top: var(--space-10);
    padding-bottom: var(--space-10);
  }

  .card {
    padding: var(--space-5);
  }
}