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

:root {
  /* Color Palette - Management Consultancy (UK, Sleek & Sophisticated) */
  --color-background: #070809;           /* Midnight charcoal */
  --color-surface: #101216;              /* Dark surface for cards/sections */
  --color-surface-soft: #181b20;         /* Slightly lighter surface */
  --color-text: #f5f6f8;                 /* Crisp white */
  --color-text-muted: #a6aab3;           /* Muted steel / neutral text */
  --color-primary: #4b6f9c;              /* Muted steel blue */
  --color-primary-soft: rgba(75, 111, 156, 0.15);
  --color-primary-strong: #3b5a7e;
  --color-border-subtle: #272b33;        /* Soft pearl gray border */
  --color-border-strong: #3a404b;
  --color-accent: #c4c6cc;               /* Refined silver accents */

  --color-success: #3ab97a;
  --color-warning: #e2b654;
  --color-danger: #e56363;

  /* Neutral Grays */
  --gray-50: #f5f6f8;
  --gray-100: #e4e7ed;
  --gray-200: #cfd3dd;
  --gray-300: #b1b7c4;
  --gray-400: #949bad;
  --gray-500: #787f93;
  --gray-600: #5f6677;
  --gray-700: #474c59;
  --gray-800: #2f333d;
  --gray-900: #191c22;

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

  --font-size-xs: 0.75rem;   /* 12px */
  --font-size-sm: 0.875rem;  /* 14px */
  --font-size-md: 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-snug: 1.35;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.75;

  /* 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-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 10px;
  --radius-xl: 16px;
  --radius-full: 999px;

  /* Shadows (subtle, corporate) */
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.24);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.5);

  /* Transitions */
  --transition-fast: 120ms ease-out;
  --transition-normal: 200ms ease-out;
  --transition-slow: 320ms ease;

  /* Layout */
  --layout-max-width: 1120px;
  --layout-gutter: var(--space-4);

  /* Focus Ring */
  --focus-ring-color: rgba(75, 111, 156, 0.65);
  --focus-ring-offset: 2px;
  --focus-ring-width: 2px;
}

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

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

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

body {
  margin: 0;
}

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

ul,
ol {
  padding-left: 1.25rem;
}

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

img,
video {
  height: auto;
}

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

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

:focus {
  outline: none;
}

[hidden] {
  display: none !important;
}

body, html {
  min-height: 100%;
}

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

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-md);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

main {
  display: block;
}

/* Headings - corporate hierarchy */

h1,
.h1 {
  font-size: clamp(2.25rem, 2.6vw + 1.6rem, 3rem);
  line-height: var(--line-height-tight);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
  font-weight: 600;
}

h2,
.h2 {
  font-size: clamp(1.75rem, 2vw + 1.2rem, 2.25rem);
  line-height: var(--line-height-tight);
  letter-spacing: -0.015em;
  margin-bottom: var(--space-3);
  font-weight: 600;
}

h3,
.h3 {
  font-size: clamp(1.5rem, 1.4vw + 1rem, 1.875rem);
  line-height: var(--line-height-snug);
  margin-bottom: var(--space-3);
  font-weight: 500;
}

h4,
.h4 {
  font-size: 1.25rem;
  line-height: var(--line-height-snug);
  margin-bottom: var(--space-2);
  font-weight: 500;
}

h5,
.h5 {
  font-size: 1.125rem;
  line-height: var(--line-height-snug);
  margin-bottom: var(--space-2);
  font-weight: 500;
}

h6,
.h6 {
  font-size: 0.9rem;
  line-height: var(--line-height-snug);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
  color: var(--gray-400);
}

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

p.lead {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  color: var(--gray-100);
}

strong {
  font-weight: 600;
}

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

.text-xs {
  font-size: var(--font-size-xs);
}

/* Links */

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

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

a:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
}

/* Horizontal Rule */

hr {
  border: 0;
  border-top: 1px solid var(--color-border-subtle);
  margin: var(--space-8) 0;
}

/* Lists */

li + li {
  margin-top: 0.25rem;
}

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

:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
}

@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;
  }
}

/* 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: 0;
}

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

/* ============================================================================
   Layout & Utilities
   ========================================================================== */

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

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

.section--subdued {
  background: radial-gradient(circle at top left, rgba(75, 111, 156, 0.16), transparent 55%),
    var(--color-surface);
}

/* 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-2 {
  gap: var(--space-2);
}

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

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

/* 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 (limited set for base) */

.mt-0 { margin-top: 0 !important; }
.mt-4 { margin-top: var(--space-4) !important; }
.mt-8 { margin-top: var(--space-8) !important; }
.mb-0 { margin-bottom: 0 !important; }
.mb-4 { margin-bottom: var(--space-4) !important; }
.mb-8 { margin-bottom: var(--space-8) !important; }

.pt-8 { padding-top: var(--space-8) !important; }
.pb-8 { padding-bottom: var(--space-8) !important; }

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

.max-w-sm { max-width: 24rem; }
.max-w-md { max-width: 32rem; }
.max-w-lg { max-width: 40rem; }

.w-full { width: 100%; }

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

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  font-size: var(--font-size-sm);
  font-weight: 500;
  line-height: 1.1;
  cursor: pointer;
  text-decoration: none;
  background-color: var(--color-primary);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-normal),
    border-color var(--transition-normal),
    box-shadow var(--transition-normal),
    transform var(--transition-fast),
    color var(--transition-normal);
}

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

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

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

.btn-outline {
  background-color: transparent;
  color: var(--color-text);
  border-color: var(--color-border-strong);
  box-shadow: none;
}

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

.btn-ghost {
  background: transparent;
  border-color: transparent;
  box-shadow: none;
  color: var(--color-text);
}

.btn-ghost:hover {
  background-color: rgba(255, 255, 255, 0.02);
}

.btn-sm {
  padding: 0.4rem 0.9rem;
  font-size: var(--font-size-xs);
}

.btn-lg {
  padding: 0.9rem 1.8rem;
  font-size: var(--font-size-md);
}

.btn-success {
  background-color: var(--color-success);
}

.btn-success:hover {
  background-color: #2f925f;
}

.btn-danger {
  background-color: var(--color-danger);
}

.btn-danger:hover {
  background-color: #c24b4b;
}

/* Form Controls */

.input,
textarea,
select {
  width: 100%;
  padding: 0.7rem 0.9rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-subtle);
  background-color: rgba(10, 12, 16, 0.96);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  line-height: 1.4;
  transition: border-color var(--transition-normal),
    box-shadow var(--transition-normal),
    background-color var(--transition-normal);
}

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

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

.input[disabled],
textarea[disabled],
select[disabled] {
  cursor: not-allowed;
  opacity: 0.6;
}

label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  margin-bottom: 0.4rem;
}

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

.form-help {
  margin-top: 0.35rem;
  font-size: var(--font-size-xs);
  color: var(--gray-400);
}

.form-error {
  margin-top: 0.35rem;
  font-size: var(--font-size-xs);
  color: var(--color-danger);
}

/* Card - used for service modules, case studies, etc. */

.card {
  background: linear-gradient(
      135deg,
      rgba(255, 255, 255, 0.02),
      rgba(255, 255, 255, 0.0)
    ),
    var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.04);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal),
    box-shadow var(--transition-normal),
    border-color var(--transition-normal),
    background-color var(--transition-normal);
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-soft);
  border-color: rgba(196, 198, 204, 0.32);
}

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

.card-title {
  margin-bottom: var(--space-2);
}

.card-meta {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--gray-500);
}

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

/* Tag / Pill for key metrics, sectors, etc. */

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.6rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.1);
  background-color: rgba(255, 255, 255, 0.03);
  font-size: var(--font-size-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--gray-300);
}

/* Media wrapper for boardroom / office imagery */

.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-xl);
  background-color: #000;
}

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

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    circle at top right,
    rgba(75, 111, 156, 0.35),
    transparent 55%
  );
  mix-blend-mode: soft-light;
  pointer-events: none;
}

/* Subtle top border divider for sections like contact details */

.section-divider {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

/* Site-specific small details (contact info, meta text) */

.text-meta {
  font-size: var(--font-size-xs);
  color: var(--gray-500);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* End of base.css */