/* ==================================================================
   Variables
   ================================================================== */
:root {
  /* Color Palette */
  --color-background: #f5f7fb;
  --color-surface: #ffffff;
  --color-surface-muted: #f0f3f8;

  --color-text: #0b1220;
  --color-text-muted: #64748b;
  --color-text-soft: #94a3b8;

  --color-primary: #0f172a; /* Deep navy */
  --color-primary-soft: #1e293b;
  --color-primary-subtle: #e2e8f0;

  --color-success: #16a34a;
  --color-warning: #f59e0b;
  --color-danger: #dc2626;

  /* Neutral grays (blue-leaning for corporate look) */
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5f5;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;

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

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

  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.7;

  /* Spacing Scale (0–96px, 4px base) */
  --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-7: 1.75rem;   /* 28px */
  --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: 0.125rem; /* 2px */
  --radius-sm: 0.25rem;  /* 4px */
  --radius-md: 0.5rem;   /* 8px */
  --radius-lg: 0.75rem;  /* 12px */
  --radius-xl: 1rem;     /* 16px */
  --radius-pill: 9999px;

  /* Shadows (subtle and professional) */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 10px 30px rgba(15, 23, 42, 0.12);

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

  /* Layout */
  --container-width: 1120px;
  --container-padding-x: clamp(1.25rem, 3vw, 2.5rem);
}

@media (min-width: 1024px) {
  :root {
    --text-base: 1.0625rem; /* Slightly larger base text on desktop */
  }
}

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

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

body {
  margin: 0;
}

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

img,
video {
  height: auto;
}

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

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

textarea {
  resize: vertical;
}

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

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

/* Respect user motion preferences */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

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

main {
  display: block;
}

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

h1 {
  font-size: clamp(2.25rem, 4vw, 2.75rem);
  letter-spacing: -0.03em;
  margin-bottom: var(--space-4);
}

h2 {
  font-size: clamp(1.875rem, 3vw, 2.25rem);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
}

h3 {
  font-size: clamp(1.5rem, 2.4vw, 1.875rem);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-2);
}

h4 {
  font-size: 1.25rem;
  margin-bottom: var(--space-2);
}

h5 {
  font-size: 1.125rem;
  margin-bottom: var(--space-2);
}

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

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

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

a {
  position: relative;
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-medium);
}

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

a:focus-visible {
  outline: 2px solid transparent;
  box-shadow: 0 0 0 2px var(--color-surface), 0 0 0 4px var(--color-primary);
  border-radius: var(--radius-xs);
}

strong,
b {
  font-weight: 600;
}

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

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

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

/* ==================================================================
   Accessibility
   ================================================================== */
:focus-visible {
  outline: 2px solid transparent;
  box-shadow: 0 0 0 2px var(--color-surface), 0 0 0 4px var(--color-primary);
}

:focus:not(:focus-visible) {
  outline: none;
  box-shadow: none;
}

/* Visually hidden (for screen reader only content) */
.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 */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--container-padding-x);
}

.section {
  padding-block: clamp(var(--space-10), 10vh, var(--space-20));
}

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

/* Flex utilities */
.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;
}

.gap-sm {
  gap: var(--space-3);
}

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

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

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

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

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

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

  .grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

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

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

.m-auto {
  margin: auto;
}

.mt-0 {
  margin-top: 0;
}

.mb-0 {
  margin-bottom: 0;
}

.mb-sm {
  margin-bottom: var(--space-3);
}

.mb-md {
  margin-bottom: var(--space-4);
}

.mb-lg {
  margin-bottom: var(--space-6);
}

.hidden {
  display: none !important;
}

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

/* Buttons */
.button,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-weight: 500;
  font-size: var(--text-sm);
  line-height: 1.2;
  cursor: pointer;
  background-color: var(--color-primary);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
  transition:
    background-color var(--transition-medium),
    color var(--transition-medium),
    box-shadow var(--transition-medium),
    transform var(--transition-fast),
    border-color var(--transition-medium);
}

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

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

.button:focus-visible,
.btn:focus-visible {
  outline: 2px solid transparent;
  box-shadow: 0 0 0 2px var(--color-surface), 0 0 0 4px var(--color-primary);
}

.button--secondary,
.btn--secondary {
  background-color: var(--color-surface);
  color: var(--color-primary);
  border-color: var(--gray-200);
  box-shadow: var(--shadow-xs);
}

.button--secondary:hover,
.btn--secondary:hover {
  background-color: var(--color-surface-muted);
  border-color: var(--gray-300);
}

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

.button--ghost:hover,
.btn--ghost:hover {
  background-color: var(--color-primary-subtle);
}

.button[disabled],
.btn[disabled],
.button:disabled,
.btn:disabled {
  cursor: not-allowed;
  opacity: 0.6;
  box-shadow: none;
  transform: none;
}

/* Form Controls */
.input,
textarea,
select,
input[type="text"],
input[type="email"],
input[type="tel"],
input[type="password"],
input[type="number"],
input[type="search"],
input[type="url"],
input[type="date"],
input[type="time"] {
  width: 100%;
  padding: 0.7rem 0.85rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-200);
  background-color: #ffffff;
  color: var(--color-text);
  font-size: var(--text-sm);
  line-height: 1.4;
  transition:
    border-color var(--transition-medium),
    box-shadow var(--transition-medium),
    background-color var(--transition-medium);
}

.input::placeholder,
textarea::placeholder,
select::placeholder,
input::placeholder {
  color: var(--color-text-soft);
}

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

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

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

.field-description {
  margin-top: 0.25rem;
  font-size: var(--text-xs);
  color: var(--color-text-soft);
}

.form-error {
  margin-top: 0.25rem;
  font-size: var(--text-xs);
  color: var(--color-danger);
}

/* Cards */
.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(148, 163, 184, 0.25);
}

.card--muted {
  background-color: var(--color-surface-muted);
  border-style: dashed;
}

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

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

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

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

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

/* Tag / Badge */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.6rem;
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background-color: var(--color-primary-subtle);
  color: var(--color-primary);
}

.badge--success {
  background-color: rgba(22, 163, 74, 0.08);
  color: var(--color-success);
}

.badge--warning {
  background-color: rgba(245, 158, 11, 0.08);
  color: var(--color-warning);
}

.badge--danger {
  background-color: rgba(220, 38, 38, 0.08);
  color: var(--color-danger);
}

/* Subtle section header used for consulting service sections */
.section-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--color-text-soft);
  margin-bottom: var(--space-2);
}

.section-heading {
  margin-bottom: var(--space-3);
}

.section-intro {
  max-width: 46rem;
  color: var(--color-text-muted);
}

/* Pricing / Feature list style (common on consulting sites) */
.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.feature-list__item {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.feature-list__item::before {
  content: "";
  margin-top: 0.4rem;
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 999px;
  background-color: var(--color-primary);
  flex-shrink: 0;
}

/* Helper for hero overlays on professional imagery */
.overlay-soft {
  position: relative;
}

.overlay-soft::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(15, 23, 42, 0.55),
    rgba(15, 23, 42, 0.15)
  );
  pointer-events: none;
}