/* ========================================================================== 
   Variables
   ========================================================================== */

:root {
  /* Colors */
  --color-background: #f5f7fa;
  --color-surface: #ffffff;
  --color-text: #1b2430;
  --color-text-muted: #6b7280;
  --color-primary: #173b6c; /* deep navy */
  --color-primary-soft: #214b86;
  --color-primary-subtle: #e5edf7;
  --color-accent: #4b7f5b; /* muted green */
  --color-success: #2e7d32;
  --color-warning: #f59e0b;
  --color-danger: #c0392b;
  --color-info: #2563eb;

  --color-border-subtle: #d1d5db;
  --color-border-strong: #9ca3af;

  --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;

  --color-steel: #b0b8c4; /* steel silver accent */

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

  --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 */
  --font-size-5xl: 3rem;     /* 48px */

  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.7;

  /* 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; /* 4px */
  --radius-md: 0.5rem;  /* 8px */
  --radius-lg: 0.75rem; /* 12px */
  --radius-xl: 1rem;    /* 16px */
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 10px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 10px 25px rgba(15, 23, 42, 0.12);

  /* Transitions */
  --transition-fast: 150ms ease-out;
  --transition-normal: 200ms ease-out;
  --transition-slow: 300ms ease-out;

  /* Layout */
  --container-max-width: 72rem; /* 1152px – comfortable for professional sites */
}

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

/* ========================================================================== 
   Reset / Normalize
   ========================================================================== */

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

html {
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
  text-size-adjust: 100%;
}

body {
  margin: 0;
}

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

ul,
ol {
  margin: 0;
  padding: 0;
}

img,
svg,
video,
canvas,
audio,
iframe,
embed,
object {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
}

a {
  text-decoration: none;
  color: inherit;
}

button,
input,
optgroup,
select,
textarea {
  margin: 0;
  font: inherit;
  color: inherit;
}

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

button,
[role="button"],
input[type="button"],
input[type="submit"],
input[type="reset"] {
  cursor: pointer;
}

button:disabled,
[role="button"][aria-disabled="true"],
input:disabled {
  cursor: not-allowed;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

/* ========================================================================== 
   Base Styles
   ========================================================================== */

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
}

main {
  min-height: 100vh;
}

h1,
 h2,
 h3,
 h4,
 h5,
 h6 {
  font-weight: 600;
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

h1 {
  font-size: var(--font-size-4xl);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
}

h2 {
  font-size: var(--font-size-3xl);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-3);
}

h3 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-2);
}

h4 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-2);
}

h5 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-1);
}

h6 {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}

p {
  margin-bottom: var(--space-4);
  }

p:last-child {
  margin-bottom: 0;
}

strong {
  font-weight: 600;
}

small {
  font-size: var(--font-size-sm);
}

code,
pre {
  font-family: var(--font-mono);
}

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

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

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

hr {
  border: 0;
  border-top: 1px solid var(--gray-200);
  margin: var(--space-6) 0;
}

/* ========================================================================== 
   Accessibility & Motion
   ========================================================================== */

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

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

/* Container */

.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

@media (min-width: 1024px) {
  .container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}

/* Flex helpers */

.flex {
  display: flex;
}

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

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

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

/* Grid helpers */

.grid {
  display: grid;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}

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

/* Spacing utilities (minimal set) */

.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }
.mt-4 { margin-top: var(--space-4) !important; }
.mb-4 { margin-bottom: var(--space-4) !important; }
.mt-6 { margin-top: var(--space-6) !important; }
.mb-6 { margin-bottom: var(--space-6) !important; }

.pt-4 { padding-top: var(--space-4) !important; }
.pb-4 { padding-bottom: var(--space-4) !important; }
.pt-6 { padding-top: var(--space-6) !important; }
.pb-6 { padding-bottom: var(--space-6) !important; }

.text-center { text-align: center !important; }
.text-right { text-align: right !important; }
.text-muted { color: var(--color-text-muted) !important; }

/* Visually hidden for 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;
}

.sr-only-focusable:focus,
.sr-only-focusable:active {
  position: static;
  width: auto;
  height: auto;
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

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

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.65rem 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-weight: 500;
  font-size: var(--font-size-sm);
  line-height: 1.2;
  transition:
    background-color var(--transition-normal),
    color var(--transition-normal),
    border-color var(--transition-normal),
    box-shadow var(--transition-normal),
    transform var(--transition-fast);
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff!important;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--color-primary-soft);
  border-color: var(--color-primary-soft);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

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

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

.btn-outline:hover {
  background-color: var(--color-primary-subtle);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

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

.btn-ghost:hover {
  background-color: var(--gray-100);
}

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

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.6;
  box-shadow: none;
  transform: none;
}

/* Inputs & form controls */

.input,
textarea,
select {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
  background-color: #ffffff;
  color: var(--color-text);
  font-size: var(--font-size-sm);
  line-height: 1.4;
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background-color var(--transition-fast);
}

.input::placeholder,
textarea::placeholder {
  color: var(--gray-400);
}

.input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 0;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary-subtle);
}

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

.input:disabled,
textarea:disabled,
select:disabled {
  background-color: var(--gray-100);
  cursor: not-allowed;
}

label {
  display: inline-block;
  margin-bottom: var(--space-1);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.form-helper {
  margin-top: var(--space-1);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.form-error {
  margin-top: var(--space-1);
  font-size: var(--font-size-xs);
  color: var(--color-danger);
}

/* Card */

.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
  padding: var(--space-6);
}

.card-header {
  margin-bottom: var(--space-4);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

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

.card-footer {
  margin-top: var(--space-4);
}

/* Badge (useful for credentials, safety labels) */

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 500;
  background-color: var(--color-primary-subtle);
  color: var(--color-primary);
}

.badge-success {
  background-color: rgba(46, 125, 50, 0.08);
  color: var(--color-success);
}

.badge-neutral {
  background-color: var(--gray-100);
  color: var(--gray-700);
}

/* Sections (helpful for clean layout) */

.section {
  padding-top: var(--space-12);
  padding-bottom: var(--space-12);
}

.section--alt {
  background-color: var(--gray-50);
}

.section-header {
  margin-bottom: var(--space-8);
}

.section-kicker {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

/* Subtle navigation bar base (for consistency across pages) */

.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(23, 59, 108, 0.98);
  color: #ffffff;
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(176, 184, 196, 0.4);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4rem;
}

.navbar-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--font-size-sm);
}

.navbar-link {
  color: rgba(255, 255, 255, 0.85);
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition:
    color var(--transition-fast),
    border-color var(--transition-fast);
}

.navbar-link:hover {
  color: #ffffff;
  border-color: rgba(176, 184, 196, 0.7);
}

.navbar-link--active {
  color: #ffffff;
  border-color: var(--color-accent);
}

/* Utility for polished hero imagery */

.hero-media {
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(176, 184, 196, 0.4);
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Testimonial / quote styling */

.quote {
  border-left: 4px solid var(--color-accent);
  padding-left: var(--space-4);
  color: var(--color-text-muted);
  font-style: italic;
}

.quote-author {
  margin-top: var(--space-3);
  font-weight: 500;
  color: var(--color-text);
}

/* Tables for credentials / certifications */

table.table {
  width: 100%;
  font-size: var(--font-size-sm);
}

table.table thead {
  background-color: var(--gray-50);
}

table.table th,
 table.table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--gray-200);
}

table.table th {
  font-weight: 600;
  color: var(--gray-700);
}

table.table tbody tr:hover {
  background-color: var(--gray-50);
}

/* Responsive helpers */

.hide-mobile {
  display: block;
}

@media (max-width: 768px) {
  .hide-mobile {
    display: none !important;
  }
}

.hide-desktop {
  display: none;
}

@media (max-width: 768px) {
  .hide-desktop {
    display: block !important;
  }
}