/**
 * Layout Patterns & Containers
 * Implements the "Systematic Flow" design motif with offset grids and responsive layouts
 *
 * @package AIIMN
 * @since 1.0.0
 */

/* ========================================
   CONTAINERS
   ======================================== */

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

.container-narrow {
  max-width: var(--max-width-narrow);
}

.container-wide {
  max-width: var(--max-width-wide);
}

.container-full {
  max-width: 100%;
  padding-left: 0;
  padding-right: 0;
}

/* ========================================
   GRID SYSTEM
   ======================================== */

.grid {
  display: grid;
  gap: var(--grid-gap);
}

.grid-2 {
  grid-template-columns: 1fr;
}

.grid-3 {
  grid-template-columns: 1fr;
}

.grid-4 {
  grid-template-columns: 1fr;
}

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

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Offset Grid (Systematic Flow Pattern) */
.grid-offset {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--grid-gap);
  align-items: center;
}

@media (min-width: 1024px) {
  .grid-offset {
    grid-template-columns: repeat(12, 1fr);
  }

  .grid-content {
    grid-column: 1 / 7;
  }

  .grid-visual {
    grid-column: 7 / 13;
  }

  .grid-visual-offset-right {
    grid-column: 8 / 13;
  }

  .grid-visual-offset-left {
    grid-column: 1 / 6;
  }
}

/* ========================================
   SECTIONS
   ======================================== */

.section {
  padding: var(--section-padding-y) 0;
  position: relative;
}

.section-compact {
  padding: var(--space-16) 0;
}

.section-header {
  margin-bottom: var(--space-12);
}

.section-header-center {
  text-align: center;
  max-width: var(--max-width-md);
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--space-12);
}

.section-intro {
  font-size: var(--font-size-body-lg);
  color: var(--color-text-secondary);
  margin-top: var(--space-4);
}

/* Section Backgrounds */
.section-bg-white {
  background-color: var(--color-white);
}

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

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

.section-bg-dark {
  background-color: var(--color-bg-dark);
  color: var(--color-white);
}

.section-bg-dark h1,
.section-bg-dark h2,
.section-bg-dark h3,
.section-bg-dark h4,
.section-bg-dark h5,
.section-bg-dark h6 {
  color: var(--color-white);
}

.section-bg-dark p {
  color: rgba(255, 255, 255, 0.9);
}

/* Section with Gradient Background */
.section-gradient {
  background: linear-gradient(135deg, var(--color-electric-base), var(--color-electric-dark));
  color: var(--color-white);
}

.section-gradient h1,
.section-gradient h2,
.section-gradient h3 {
  color: var(--color-white);
}

/* ========================================
   HERO SECTIONS
   ======================================== */

.hero {
  padding: var(--space-24) 0;
  min-height: 60vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

@media (min-width: 1024px) {
  .hero {
    padding: var(--space-32) 0;
    min-height: 70vh;
  }
}

/* Homepage Hero */
.hero-home {
  background: linear-gradient(to bottom, var(--color-bg-primary), var(--color-white));
  text-align: center;
}

.hero-title {
  max-width: var(--max-width-lg);
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--space-6);
}

.hero-subtitle {
  font-size: var(--font-size-body-xl);
  color: var(--color-text-secondary);
  max-width: var(--max-width-md);
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--space-8);
}

.hero-cta-group {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-12);
}

.hero-visual {
  max-width: 800px;
  margin: var(--space-12) auto 0;
}

/* Internal Page Hero */
.hero-internal {
  background: var(--color-primary-900);
  color: var(--color-white);
  padding: var(--space-16) 0;
  min-height: auto;
}

@media (min-width: 768px) {
  .hero-internal {
    padding: var(--space-20) 0;
  }
}

/* ========================================
   CTA SECTIONS
   ======================================== */

.section-cta {
  text-align: center;
  padding: var(--space-20) 0;
}

@media (min-width: 768px) {
  .section-cta {
    padding: var(--space-24) 0;
  }
}

.section-cta-primary {
  background: linear-gradient(135deg, var(--color-electric-base), var(--color-electric-dark));
  color: var(--color-white);
}

.cta-title {
  color: var(--color-white);
  margin-bottom: var(--space-6);
}

.cta-subtitle {
  font-size: var(--font-size-body-lg);
  opacity: 0.9;
  margin-bottom: var(--space-8);
}

.cta-note {
  font-size: var(--font-size-body-sm);
  opacity: 0.8;
  margin-top: var(--space-4);
}

/* ========================================
   FEATURE GRIDS
   ======================================== */

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-top: var(--space-10);
}

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

@media (min-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ========================================
   STEP PROCESS (NUMBERED)
   ======================================== */

.steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
  position: relative;
}

.step {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--grid-gap);
  align-items: center;
  position: relative;
}

@media (min-width: 1024px) {
  .step {
    grid-template-columns: repeat(12, 1fr);
  }

  .step-offset-left .step-content {
    grid-column: 3 / 10;
  }

  .step-offset-right .step-content {
    grid-column: 5 / 12;
  }

  .step-offset-left .step-number,
  .step-offset-right .step-number {
    position: absolute;
    z-index: 0;
  }

  .step-offset-left .step-number {
    left: 0;
  }

  .step-offset-right .step-number {
    right: 0;
  }
}

.step-number {
  font-size: 4rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-electric-base);
  opacity: 0.15;
  line-height: 1;
}

@media (min-width: 768px) {
  .step-number {
    font-size: 6rem;
  }
}

.step-content {
  position: relative;
  z-index: 1;
}

.step-title {
  margin-bottom: var(--space-3);
}

.step-description {
  color: var(--color-text-secondary);
}

/* ========================================
   TWO-COLUMN LAYOUT
   ======================================== */

.two-column {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--grid-gap);
  align-items: center;
  margin-bottom: var(--space-12);
}

@media (min-width: 1024px) {
  .two-column {
    grid-template-columns: repeat(2, 1fr);
  }

  .two-column-reverse {
    direction: rtl;
  }

  .two-column-reverse > * {
    direction: ltr;
  }
}

.column-image img {
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
}

.column-content {
  max-width: var(--max-width-narrow);
}

/* ========================================
   TESTIMONIALS
   ======================================== */

.testimonials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 1024px) {
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ========================================
   CASE STUDIES
   ======================================== */

.case-studies-filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-10);
  justify-content: center;
}

.filter-btn {
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-body-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background: transparent;
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition-colors);
}

.filter-btn:hover,
.filter-active {
  background: var(--color-electric-base);
  color: var(--color-white);
  border-color: var(--color-electric-base);
}

.case-studies-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 1024px) {
  .case-studies-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.case-study-card {
  position: relative;
}

.case-study-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius-card) var(--radius-card) 0 0;
}

.case-study-tags {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
  flex-wrap: wrap;
}

.case-study-metrics {
  display: flex;
  gap: var(--space-6);
  margin-top: var(--space-6);
}

/* ========================================
   SITE HEADER
   ======================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border-default);
  transition: var(--transition-default);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) var(--container-padding-x);
  min-height: 72px;
}

@media (min-width: 1024px) {
  .header-container {
    min-height: 88px;
  }
}

.site-logo img {
  height: 32px;
  width: auto;
}

@media (min-width: 1024px) {
  .site-logo img {
    height: 40px;
  }
}

/* ========================================
   NAVIGATION
   ======================================== */

.primary-navigation {
  display: none;
}

@media (min-width: 1024px) {
  .primary-navigation {
    display: flex;
    align-items: center;
    gap: var(--space-2);
  }
}

.nav-menu {
  display: flex;
  gap: var(--space-2);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-menu a {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  transition: var(--transition-colors);
  border-radius: var(--radius-md);
}

.nav-menu a:hover,
.nav-menu .current-menu-item a {
  color: var(--color-electric-base);
  background: var(--color-arctic-light);
}

/* Mobile Navigation */
.mobile-menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
}

@media (min-width: 1024px) {
  .mobile-menu-toggle {
    display: none;
  }
}

.mobile-menu-toggle svg {
  width: 24px;
  height: 24px;
  color: var(--color-text-primary);
}

.mobile-navigation {
  position: fixed;
  top: 0;
  right: -100%;
  width: 100%;
  max-width: 400px;
  height: 100vh;
  background: var(--color-white);
  box-shadow: var(--shadow-2xl);
  z-index: var(--z-modal);
  overflow-y: auto;
  transition: right var(--duration-slow) var(--timing-ease-out);
}

.mobile-navigation.active {
  right: 0;
}

.mobile-nav-header {
  display: flex;
  justify-content: flex-end;
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border-default);
}

.mobile-menu-close {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  cursor: pointer;
}

.mobile-menu-close svg {
  width: 24px;
  height: 24px;
}

.mobile-nav-menu {
  padding: var(--space-6) 0;
}

.mobile-nav-menu li {
  border-bottom: 1px solid var(--color-border-default);
}

.mobile-nav-menu a {
  display: block;
  padding: var(--space-4) var(--space-6);
  font-size: var(--font-size-body-lg);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.mobile-nav-menu a:hover {
  background: var(--color-arctic-light);
}

/* ========================================
   SITE FOOTER
   ======================================== */

.site-footer {
  background: var(--color-primary-900);
  color: var(--color-white);
  padding: var(--space-16) 0 var(--space-8);
  margin-top: auto;
}

.footer-main {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-10);
}

@media (min-width: 768px) {
  .footer-main {
    grid-template-columns: 1fr 2fr;
  }
}

.footer-brand img {
  height: 36px;
  margin-bottom: var(--space-6);
}

.footer-tagline {
  color: var(--color-neutral-400);
  margin-bottom: var(--space-6);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-8);
}

.footer-nav-column h3 {
  font-size: var(--font-size-h6);
  margin-bottom: var(--space-4);
  color: var(--color-white);
}

.footer-nav-column ul {
  list-style: none;
}

.footer-nav-column a {
  display: block;
  padding: var(--space-2) 0;
  font-size: var(--font-size-body-sm);
  color: var(--color-neutral-400);
  transition: var(--transition-colors);
}

.footer-nav-column a:hover {
  color: var(--color-white);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-copyright {
  font-size: var(--font-size-body-sm);
  color: var(--color-neutral-400);
  margin-bottom: 0;
}

.footer-legal {
  display: flex;
  gap: var(--space-6);
}

.footer-legal a {
  font-size: var(--font-size-body-sm);
  color: var(--color-neutral-400);
}

.footer-legal a:hover {
  color: var(--color-white);
}