/* ============================================================
   Conceptlab Consulting — Main Stylesheet
   ============================================================ */

/* ----------------------------------------------------------
   CSS Custom Properties
   ---------------------------------------------------------- */
:root {
  /* Colors */
  --color-bg:           #0f1117;
  --color-surface:      #161b27;
  --color-surface-alt:  #12161f;
  --color-border:       #1e2535;
  --color-accent:       #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-accent-light: rgba(37, 99, 235, 0.12);
  --color-text:         #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-muted:   #64748b;
  --color-success:      #10b981;
  --color-warning:      #f59e0b;
  --color-error:        #ef4444;

  /* Typography */
  --font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-xs: 0.75rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-hero: clamp(2.2rem, 5vw, 3.5rem);
  --line-height-body: 1.6;
  --line-height-heading: 1.1;

  /* Spacing */
  --space-xs:  0.25rem;
  --space-sm:  0.5rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-section: 80px;

  /* Layout */
  --max-width: 1140px;
  --radius:    8px;
  --radius-sm: 4px;
  --radius-lg: 12px;

  /* Nav */
  --nav-height: 64px;
  --nav-bg: rgba(15, 17, 23, 0.97);

  /* Transitions */
  --transition: 0.18s ease;
  --transition-md: 0.28s ease;
}

/* ----------------------------------------------------------
   Reset & Base
   ---------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

a:hover { color: var(--color-accent-hover); }
a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

ul, ol { list-style: none; }

h1, h2, h3, h4, h5, h6 {
  line-height: var(--line-height-heading);
  font-weight: 700;
  color: var(--color-text);
}

p { color: var(--color-text-secondary); }

/* ----------------------------------------------------------
   Layout Utilities
   ---------------------------------------------------------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-section) 0;
}

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

.section--surface {
  background-color: var(--color-surface);
}

.section--diagnostic {
  background: linear-gradient(135deg, #0d1420 0%, #111827 100%);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

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

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

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 680px;
}

.section-header--center .section-subtitle {
  margin: 0 auto;
}

/* ----------------------------------------------------------
   Navigation
   ---------------------------------------------------------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: var(--nav-bg);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xl);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
  color: var(--color-text);
  font-weight: 600;
  font-size: var(--font-size-lg);
}

.nav__logo:hover { color: var(--color-text); }

.nav__logo img {
  height: 36px;
  width: auto;
  object-fit: contain;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  flex-wrap: nowrap;
}

.nav__link {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: color var(--transition), background var(--transition);
}

.nav__link:hover {
  color: var(--color-text);
  background: rgba(255,255,255,0.05);
}

.nav__link.active,
.nav__link[aria-current="page"] {
  color: var(--color-accent);
  background: var(--color-accent-light);
}

/* Contact link styled as button */
.nav__link--cta {
  background: var(--color-accent);
  color: #fff !important;
  padding: var(--space-xs) var(--space-md);
}

.nav__link--cta:hover {
  background: var(--color-accent-hover) !important;
  color: #fff !important;
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--space-sm);
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

.nav__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav__hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav__hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav__hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile nav drawer */
.nav__mobile {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  z-index: 999;
  padding: var(--space-md) var(--space-lg);
  flex-direction: column;
  gap: var(--space-xs);
}

.nav__mobile.open { display: flex; }

.nav__mobile .nav__link {
  display: block;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-base);
  border-radius: var(--radius-sm);
}

/* Page offset for fixed nav */
.page-top { padding-top: var(--nav-height); }

/* ----------------------------------------------------------
   Buttons
   ---------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.5rem;
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition), border-color var(--transition), color var(--transition), transform 0.1s ease;
  white-space: nowrap;
  line-height: 1.2;
}

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

.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #fff;
}

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

.btn--ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-light);
}

.btn--lg {
  padding: 1rem 2rem;
  font-size: var(--font-size-lg);
}

.btn--sm {
  padding: 0.5rem 1rem;
  font-size: var(--font-size-sm);
}

/* ----------------------------------------------------------
   Hero Section
   ---------------------------------------------------------- */
.hero {
  background: linear-gradient(160deg, #0a0e1a 0%, #0f1117 50%, #0d1520 100%);
  padding: calc(var(--space-section) + var(--space-2xl)) 0 var(--space-section);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  max-width: 820px;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-lg);
}

.hero__eyebrow::before {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-accent);
}

.hero__headline {
  font-size: var(--font-size-hero);
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
  letter-spacing: -0.02em;
}

.hero__headline em {
  font-style: normal;
  color: var(--color-accent);
}

.hero__subheadline {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-bottom: var(--space-2xl);
  max-width: 640px;
}

.hero__ctas {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* ----------------------------------------------------------
   Problem Cards Grid
   ---------------------------------------------------------- */
.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

.problem-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-lg);
  transition: border-color var(--transition), transform var(--transition-md);
}

.problem-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.problem-card__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.problem-card__title::before {
  content: '';
  display: block;
  width: 28px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 2px;
  margin-bottom: var(--space-sm);
}

.problem-card__body {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.55;
}

/* ----------------------------------------------------------
   Service Cards Grid
   ---------------------------------------------------------- */
.service-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-accent);
  border-radius: var(--radius);
  padding: var(--space-xl);
  transition: border-color var(--transition), box-shadow var(--transition-md);
  display: flex;
  flex-direction: column;
}

.service-card:hover {
  box-shadow: 0 8px 32px rgba(37, 99, 235, 0.15);
  border-color: var(--color-accent);
  border-top-color: var(--color-accent);
}

.service-card__title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.service-card__body {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  flex: 1;
  margin-bottom: var(--space-lg);
}

.service-card__link {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  margin-top: auto;
}

.service-card__link::after { content: ' \2192'; }
.service-card__link:hover { color: var(--color-accent-hover); }

/* ----------------------------------------------------------
   Why Experience / 3-col feature grid
   ---------------------------------------------------------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.feature-item {
  padding: var(--space-xl);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.feature-item__title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.feature-item__body {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* ----------------------------------------------------------
   Tag Cloud / Technical Depth
   ---------------------------------------------------------- */
.tech-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.tech-section__intro {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tag {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}

.tag:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-light);
}

/* ----------------------------------------------------------
   Diagnostic Section
   ---------------------------------------------------------- */
.diagnostic-box {
  max-width: 780px;
  margin: 0 auto;
  text-align: center;
}

.diagnostic-box .section-title { margin-bottom: var(--space-md); }

.diagnostic-subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

.diagnostic-desc {
  font-size: var(--font-size-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-2xl);
  max-width: 620px;
  margin-left: auto;
  margin-right: auto;
}

/* ----------------------------------------------------------
   Case Study Cards (homepage previews)
   ---------------------------------------------------------- */
.case-study-preview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

.case-preview-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-xl);
  position: relative;
}

.case-preview-card__badge {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: 100px;
  background: rgba(16, 185, 129, 0.1);
  color: var(--color-success);
  border: 1px solid rgba(16, 185, 129, 0.3);
  margin-bottom: var(--space-md);
}

.case-preview-card__title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
}

/* ----------------------------------------------------------
   Case Study Full Cards (case-studies.html)
   ---------------------------------------------------------- */
.case-study-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: var(--space-xl);
}

.case-study-card__header {
  padding: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-md);
}

.case-study-card__title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.case-study-card__meta {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.case-study-badge {
  display: inline-block;
  flex-shrink: 0;
  font-size: var(--font-size-xs);
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
  background: rgba(245, 158, 11, 0.1);
  color: var(--color-warning);
  border: 1px solid rgba(245, 158, 11, 0.3);
  white-space: nowrap;
}

.case-study-card__body {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
}

.case-study-section {
  padding: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.case-study-section:nth-child(odd) {
  border-right: 1px solid var(--color-border);
}

.case-study-section:last-child,
.case-study-section:nth-last-child(2):nth-child(odd) {
  border-bottom: none;
}

.case-study-section__label {
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.case-study-section__content {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* ----------------------------------------------------------
   Article Cards
   ---------------------------------------------------------- */
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.article-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition), transform var(--transition-md);
}

.article-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.article-card--coming {
  opacity: 0.5;
  pointer-events: none;
}

.article-card__tag {
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.article-card__title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
  margin-bottom: var(--space-md);
  flex: 1;
}

.article-card__coming-badge {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  background: rgba(100, 116, 139, 0.15);
  color: var(--color-text-muted);
  border-radius: 100px;
  border: 1px solid var(--color-border);
}

.article-card__link {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-accent);
  margin-top: auto;
}

.article-card__link:hover { color: var(--color-accent-hover); }
.article-card__link::after { content: ' \2192'; }

/* ----------------------------------------------------------
   Article List (articles.html full list)
   ---------------------------------------------------------- */
.article-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.article-list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-xl);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  gap: var(--space-md);
  transition: border-color var(--transition);
}

.article-list-item:hover {
  border-color: var(--color-accent);
}

.article-list-item--coming {
  opacity: 0.5;
  pointer-events: none;
}

.article-list-item__title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
}

.article-list-item__action {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-accent);
  white-space: nowrap;
  flex-shrink: 0;
}

.article-list-item--coming .article-list-item__action {
  color: var(--color-text-muted);
}

/* ----------------------------------------------------------
   Services Detail Page
   ---------------------------------------------------------- */
.services-section {
  margin-bottom: var(--space-3xl);
  padding-bottom: var(--space-3xl);
  border-bottom: 1px solid var(--color-border);
}

.services-section:last-child {
  border-bottom: none;
}

.services-section__title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.services-section__intro {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-xl);
  max-width: 720px;
}

.services-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm) var(--space-xl);
  margin-bottom: var(--space-xl);
}

.services-list li {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  padding: var(--space-xs) 0;
  padding-left: var(--space-md);
  position: relative;
}

.services-list li::before {
  content: '–';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}

/* ----------------------------------------------------------
   Subsection layout (detail pages)
   ---------------------------------------------------------- */
.subsection {
  margin-bottom: var(--space-2xl);
  padding: var(--space-xl);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius);
}

.subsection__title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.subsection__body {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.subsection__list {
  margin-top: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.subsection__list li {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  padding-left: var(--space-md);
  position: relative;
}

.subsection__list li::before {
  content: '\2192';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-size: 0.7rem;
  top: 0.15em;
}

/* ----------------------------------------------------------
   Approach Steps
   ---------------------------------------------------------- */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.step-item {
  padding: var(--space-xl);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  position: relative;
}

.step-item__number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-accent);
  opacity: 0.3;
  line-height: 1;
  margin-bottom: var(--space-sm);
}

.step-item__title {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.step-item__body {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ----------------------------------------------------------
   Problem Grid (troubleshooting page)
   ---------------------------------------------------------- */
.trouble-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

.trouble-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-lg);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  position: relative;
  padding-left: calc(var(--space-lg) + var(--space-md));
}

.trouble-item::before {
  content: '▸';
  position: absolute;
  left: var(--space-lg);
  color: var(--color-accent);
  font-size: 0.75rem;
  top: calc(var(--space-lg) + 2px);
}

/* ----------------------------------------------------------
   Contact Form
   ---------------------------------------------------------- */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: var(--space-3xl);
  align-items: start;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
}

.form-label .required {
  color: var(--color-accent);
  margin-left: 2px;
}

.form-input,
.form-textarea,
.form-select {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  padding: 0.75rem var(--space-md);
  transition: border-color var(--transition), box-shadow var(--transition);
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-muted);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='%2364748b' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-md) center;
  background-size: 12px;
  padding-right: 2.5rem;
  cursor: pointer;
}

.form-select option {
  background: var(--color-surface);
  color: var(--color-text);
}

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

.form-message {
  display: none;
  padding: var(--space-lg);
  border-radius: var(--radius);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.form-message--success {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--color-success);
}

.form-message--error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--color-error);
}

.contact-info {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-xl));
}

.contact-info-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-xl);
}

.contact-info-box__title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
}

.contact-info-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-lg);
}

.contact-info-item:last-child { margin-bottom: 0; }

.contact-info-item__label {
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}

.contact-info-item__value {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.contact-info-item__value a {
  color: var(--color-accent);
}

/* ----------------------------------------------------------
   About Page
   ---------------------------------------------------------- */
.about-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.about-prose p {
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: var(--space-lg);
}

.about-prose p:last-child { margin-bottom: 0; }

.about-sidebar {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-xl));
}

.sidebar-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.sidebar-box__title {
  font-size: var(--font-size-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.sidebar-box__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.sidebar-box__list li {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  padding: var(--space-xs) 0;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-box__list li:last-child { border-bottom: none; }

/* Does Not Do section */
.not-do-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.not-do-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-md) var(--space-lg);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  position: relative;
  padding-left: calc(var(--space-lg) + var(--space-md));
}

.not-do-item::before {
  content: '✕';
  position: absolute;
  left: var(--space-md);
  color: var(--color-error);
  font-size: 0.7rem;
  opacity: 0.7;
  top: calc(var(--space-md) + 2px);
}

/* ----------------------------------------------------------
   Article Content
   ---------------------------------------------------------- */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--space-3xl);
  align-items: start;
}

.article-content {
  max-width: 720px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.article-meta__date,
.article-meta__read-time {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.article-meta__tag {
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  background: var(--color-accent-light);
  padding: 0.2rem 0.6rem;
  border-radius: 100px;
}

.article-body h2 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
}

.article-body h3 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

.article-body p {
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: var(--space-md);
}

.article-body ul {
  list-style: none;
  margin-bottom: var(--space-md);
  padding-left: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.article-body ul li {
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
  line-height: 1.65;
  position: relative;
  padding-left: var(--space-md);
}

.article-body ul li::before {
  content: '\2192';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-size: 0.75rem;
  top: 0.2em;
}

.article-body code {
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.9em;
  background: rgba(255,255,255,0.07);
  padding: 0.1em 0.4em;
  border-radius: 3px;
  color: var(--color-text);
}

.article-body strong {
  color: var(--color-text);
  font-weight: 600;
}

.article-cta-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius);
  padding: var(--space-xl);
  margin-top: var(--space-2xl);
}

.article-cta-box p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

.article-sidebar {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-xl));
}

/* ----------------------------------------------------------
   CTA Banner / Final Section
   ---------------------------------------------------------- */
.cta-section {
  background: linear-gradient(135deg, #0a0e1a 0%, #0f1117 100%);
  text-align: center;
  padding: var(--space-section) 0;
  border-top: 1px solid var(--color-border);
}

.cta-section .section-title {
  margin-bottom: var(--space-md);
}

.cta-section p {
  max-width: 600px;
  margin: 0 auto var(--space-2xl);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ----------------------------------------------------------
   Breadcrumb
   ---------------------------------------------------------- */
.breadcrumb {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 0;
}

.breadcrumb__list {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  list-style: none;
  flex-wrap: wrap;
}

.breadcrumb__item {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.breadcrumb__item:not(:last-child)::after {
  content: '/';
  color: var(--color-border);
}

.breadcrumb__item a {
  color: var(--color-text-secondary);
}

.breadcrumb__item a:hover { color: var(--color-accent); }

.breadcrumb__item--current {
  color: var(--color-text-secondary);
}

/* ----------------------------------------------------------
   Page Hero (non-home pages)
   ---------------------------------------------------------- */
.page-hero {
  background: linear-gradient(160deg, #0a0e1a 0%, #0f1117 100%);
  padding: var(--space-section) 0 var(--space-2xl);
  border-bottom: 1px solid var(--color-border);
}

.page-hero__tagline {
  font-size: var(--font-size-lg);
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.page-hero__intro {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: 1.65;
  max-width: 680px;
  margin-top: var(--space-md);
}

/* ----------------------------------------------------------
   Footer
   ---------------------------------------------------------- */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.footer__main {
  padding: var(--space-section) 0 var(--space-2xl);
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: var(--space-3xl);
}

.footer__brand img {
  height: 32px;
  width: auto;
  object-fit: contain;
  margin-bottom: var(--space-md);
}

.footer__tagline {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: var(--space-lg);
}

.footer__col-title {
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer__link {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.footer__link:hover { color: var(--color-accent); }

.footer__contact-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.footer__contact-item:last-child { margin-bottom: 0; }

.footer__contact-label {
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}

.footer__contact-value {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.footer__contact-value a { color: var(--color-accent); }

.footer__bottom {
  border-top: 1px solid var(--color-border);
  padding: var(--space-lg) 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

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

.footer__legal {
  display: flex;
  gap: var(--space-lg);
}

.footer__legal a {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.footer__legal a:hover { color: var(--color-accent); }

/* ----------------------------------------------------------
   Utilities
   ---------------------------------------------------------- */
.text-accent { color: var(--color-accent); }
.text-muted  { color: var(--color-text-muted); }
.text-center { text-align: center; }
.mt-sm  { margin-top: var(--space-sm); }
.mt-md  { margin-top: var(--space-md); }
.mt-lg  { margin-top: var(--space-lg); }
.mt-xl  { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }
.mb-md  { margin-bottom: var(--space-md); }
.mb-lg  { margin-bottom: var(--space-lg); }
.mb-xl  { margin-bottom: var(--space-xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

/* ----------------------------------------------------------
   Responsive — 1024px
   ---------------------------------------------------------- */
@media (max-width: 1024px) {
  .service-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .tech-section {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .article-layout {
    grid-template-columns: 1fr;
  }

  .article-sidebar {
    position: static;
  }

  .footer__main {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
  }

  .footer__brand {
    grid-column: span 2;
  }
}

/* ----------------------------------------------------------
   Responsive — 768px
   ---------------------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --space-section: 56px;
  }

  /* Nav */
  .nav__links { display: none; }
  .nav__hamburger { display: flex; }

  /* Hero */
  .hero__ctas {
    flex-direction: column;
  }

  .hero__ctas .btn {
    width: 100%;
    justify-content: center;
  }

  /* Grids */
  .problem-grid,
  .case-study-preview-grid,
  .feature-grid,
  .service-grid,
  .steps-grid,
  .trouble-grid,
  .article-grid {
    grid-template-columns: 1fr;
  }

  /* Case study card body */
  .case-study-card__body {
    grid-template-columns: 1fr;
  }

  .case-study-section:nth-child(odd) {
    border-right: none;
  }

  .case-study-section:nth-last-child(2):nth-child(odd) {
    border-bottom: 1px solid var(--color-border);
  }

  .case-study-card__header {
    flex-direction: column;
    align-items: flex-start;
  }

  /* Services list */
  .services-list {
    grid-template-columns: 1fr;
  }

  /* Contact layout */
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .contact-info {
    position: static;
  }

  /* Form row */
  .form-row {
    grid-template-columns: 1fr;
  }

  /* About */
  .about-content {
    grid-template-columns: 1fr;
  }

  .about-sidebar {
    position: static;
  }

  .not-do-grid {
    grid-template-columns: 1fr;
  }

  /* Footer */
  .footer__main {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .footer__brand {
    grid-column: auto;
  }

  .footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
}

/* ----------------------------------------------------------
   Print styles
   ---------------------------------------------------------- */
@media print {
  .nav,
  .nav__mobile,
  .footer,
  .cta-section,
  .hero__ctas,
  .btn {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  .page-top {
    padding-top: 0;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}