/* Bey Adhi - Case Studies Portfolio */
/* Typography: Google Sans Medium (headings), IBM Plex Sans (body) */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300;1,400;1,500;1,600;1,700&display=swap');

/* Google Sans via local fallback - using system fonts as Google Sans requires special access */
@font-face {
  font-family: 'Google Sans';
  src: local('Google Sans Medium'), local('GoogleSans-Medium'), local('Product Sans Medium');
  font-weight: 500;
  font-style: normal;
}

@font-face {
  font-family: 'Google Sans';
  src: local('Google Sans Bold'), local('GoogleSans-Bold'), local('Product Sans Bold');
  font-weight: 700;
  font-style: normal;
}

/* CSS Variables */
:root {
  /* Colors - Light Minimal */
  --color-bg: #FAFAFA;
  --color-bg-card: #FFFFFF;
  --color-bg-hover: #F5F5F5;
  --color-text-primary: #1A1A1A;
  --color-text-secondary: #3D3D3D;
  --color-text-muted: #6B6B6B;
  --color-primary: #0828CC;
  --color-primary-light: #EEF0FB;
  --color-accent: #1A1A1A;
  --color-accent-light: #E8E8E8;
  --color-border: #E0E0E0;
  --color-border-light: #EDEDEE;

  /* Typography */
  --font-heading: 'Google Sans', 'Product Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  /* Layout */
  --max-width: 1200px;
  --max-width-content: 800px;
  --border-radius: 12px;
  --border-radius-sm: 8px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-smooth: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.7;
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 500;
  line-height: 1.3;
  color: var(--color-text-primary);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
}

h4 {
  font-size: 1.0625rem;
  font-weight: 600;
}

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

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

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

strong {
  font-weight: 600;
}

/* Layout */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

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

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 250, 250, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.header__brand {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-text-primary);
}

.header__brand span {
  color: var(--color-text-muted);
  font-weight: 400;
  transition: color var(--transition-base);
}

.header__brand:hover span {
  color: var(--color-text-secondary);
}

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

.header__link {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  position: relative;
  transition: color var(--transition-base);
}

.header__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-smooth);
}

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

.header__link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Hero Section */
.hero {
  padding: var(--space-xl) 0 var(--space-md);
}

.hero__title {
  margin-bottom: var(--space-xs);
}

.hero__subtitle {
  font-size: clamp(1.0625rem, 2vw, 1.1875rem);
  color: var(--color-text-secondary);
  max-width: 560px;
  font-weight: 400;
  line-height: 1.6;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: var(--space-sm);
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  transition: color var(--transition-base), border-color var(--transition-base);
}

.hero__cta svg {
  transition: transform var(--transition-smooth);
}

.hero__cta:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.hero__cta:hover svg {
  transform: translateX(3px);
}

/* Case Studies Grid - Balanced approach */
.case-studies-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr));
  gap: var(--space-md);
  padding: var(--space-md) 0 var(--space-2xl);
}

.case-study-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.case-study-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(8, 40, 204, 0.08);
  border-color: var(--color-primary);
}

.case-study-card__image {
  aspect-ratio: 16 / 9;
  background: var(--color-bg-hover);
  position: relative;
  overflow: hidden;
}

.case-study-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-smooth);
}

.case-study-card:hover .case-study-card__image img {
  transform: scale(1.03);
}

.case-study-card__image-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  transition: transform var(--transition-smooth);
}

.case-study-card:hover .case-study-card__image-placeholder {
  transform: scale(1.03);
}

.case-study-card__content {
  padding: var(--space-sm) var(--space-md) var(--space-md);
}

.case-study-card__title {
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
}

.case-study-card__description {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
  margin-bottom: var(--space-sm);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.case-study-card__meta {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.case-study-card__tag {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-bg);
  padding: 0.2rem 0.625rem;
  border-radius: 100px;
  letter-spacing: 0.01em;
  transition: color var(--transition-base), background-color var(--transition-base);
}

.case-study-card:hover .case-study-card__tag {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

/* Case Study Page */
.case-study-hero {
  padding: var(--space-xl) 0 var(--space-lg);
}

.case-study-hero__eyebrow {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
}

.case-study-hero__title {
  margin-bottom: var(--space-sm);
}

.case-study-hero__subtitle {
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  color: var(--color-text-secondary);
  max-width: 640px;
  line-height: 1.6;
  margin-bottom: var(--space-lg);
}

.case-study-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm) var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-light);
}

.case-study-meta__item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.case-study-meta__label {
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.case-study-meta__value {
  font-size: 0.875rem;
  color: var(--color-text-primary);
  line-height: 1.5;
}

/* Section Cards */
.case-study-content {
  padding: var(--space-xl) 0 var(--space-2xl);
}

.section-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  transition: box-shadow var(--transition-smooth), border-color var(--transition-base);
}

.section-card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
  border-color: var(--color-border);
}

.section-card:last-child {
  margin-bottom: 0;
}

/* Scroll reveal */
.section-card {
  opacity: 0;
  transform: translateY(20px);
}

.section-card.is-visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 600ms cubic-bezier(0.4, 0, 0.2, 1),
              transform 600ms cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow var(--transition-smooth),
              border-color var(--transition-base);
}

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

.section-card__number {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-xs);
}

.section-card__title {
  font-size: 1.5rem;
}

.section-card__content {
  font-size: 0.9375rem;
  line-height: 1.75;
}

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

.section-card__content p:last-child {
  margin-bottom: 0;
}

.section-card__content strong {
  color: var(--color-text-primary);
}

.section-card__content h4 {
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
  color: var(--color-text-primary);
}

/* Blockquote */
blockquote {
  border-left: 3px solid var(--color-primary);
  padding-left: var(--space-md);
  margin: var(--space-md) 0;
  font-size: 1rem;
  font-style: italic;
  color: var(--color-text-primary);
  line-height: 1.7;
}

/* Lists in content */
.section-card__content ul,
.section-card__content ol {
  margin: var(--space-sm) 0;
  padding-left: var(--space-md);
  color: var(--color-text-secondary);
}

.section-card__content li {
  margin-bottom: 0.375rem;
  line-height: 1.65;
}

.section-card__content li strong {
  color: var(--color-text-primary);
}

/* Insight Cards */
.insight-grid {
  display: grid;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.insight-card {
  background: var(--color-bg);
  border-radius: var(--border-radius-sm);
  padding: var(--space-md);
}

.insight-card__number {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 500;
  color: var(--color-primary-light);
  line-height: 1;
  margin-bottom: var(--space-xs);
}

.insight-card__title {
  font-size: 1.125rem;
  margin-bottom: var(--space-xs);
}

.insight-card__description {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

/* Image Placeholder */
.image-placeholder {
  background: linear-gradient(135deg, var(--color-accent-light) 0%, var(--color-border) 100%);
  border-radius: var(--border-radius-sm);
  padding: var(--space-lg);
  margin: var(--space-md) 0;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* Image Comparison Slider (Before/After) */
.image-compare {
  position: relative;
  overflow: hidden;
  border-radius: var(--border-radius-sm);
  margin: var(--space-md) 0;
  cursor: ew-resize;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
  --split: 50%;
}

.image-compare img {
  pointer-events: none;
  -webkit-user-drag: none;
}

.image-compare__before,
.image-compare__after {
  display: block;
  width: 100%;
  height: auto;
}

.image-compare__before {
  position: relative;
  z-index: 1;
}

.image-compare__after {
  position: absolute;
  inset: 0;
  z-index: 2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  clip-path: inset(0 0 0 var(--split));
}

.image-compare__handle {
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--split);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  transform: translateX(-50%);
  pointer-events: none;
}

.image-compare__handle-line {
  flex: 1;
  width: 2px;
  background: #fff;
  box-shadow: 0 0 4px rgba(0, 0, 0, 0.3);
}

.image-compare__handle-grip {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.image-compare__handle-grip::before {
  content: '';
  width: 16px;
  height: 16px;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 16 16' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M5 3L1 8l4 5M11 3l4 5-4 5' stroke='%23555' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
}

.image-compare__label {
  position: absolute;
  top: var(--space-sm);
  z-index: 4;
  padding: 2px 10px;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: #fff;
  background: rgba(0, 0, 0, 0.45);
  pointer-events: none;
}

.image-compare__label--before {
  left: var(--space-sm);
}

.image-compare__label--after {
  right: var(--space-sm);
}

/* Project Navigation (prev/next) */
.project-nav {
  display: flex;
  justify-content: space-between;
  gap: var(--space-md);
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border-light);
}

.project-nav__link {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: var(--space-sm) 0;
  max-width: 45%;
  transition: color var(--transition-fast);
}

.project-nav__link--next {
  text-align: right;
  margin-left: auto;
}

.project-nav__title {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-text-primary);
  transition: color var(--transition-base), transform var(--transition-smooth);
}

.project-nav__label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: color var(--transition-base);
}

.project-nav__link:hover .project-nav__label {
  color: var(--color-primary);
}

.project-nav__link:hover .project-nav__title {
  color: var(--color-primary);
}

.project-nav__link--prev:hover .project-nav__title {
  transform: translateX(-4px);
}

.project-nav__link--next:hover .project-nav__title {
  transform: translateX(4px);
}

/* Footer */
.footer {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border-light);
  text-align: center;
}

.footer__text {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.footer__link {
  color: var(--color-text-secondary);
  text-decoration: none;
  position: relative;
  transition: color var(--transition-base);
}

.footer__link::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--color-text-muted);
  transform: scaleX(1);
  transform-origin: left;
  transition: transform var(--transition-smooth), background-color var(--transition-base);
}

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

.footer__link:hover::after {
  background: var(--color-primary);
  transform: scaleX(1);
  transform-origin: left;
  animation: underline-wipe 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes underline-wipe {
  0% { transform: scaleX(0); transform-origin: left; }
  100% { transform: scaleX(1); transform-origin: left; }
}

/* Section card images — clickable */
.section-card__content img {
  cursor: pointer;
  border-radius: var(--border-radius-sm);
  transition: opacity var(--transition-base);
}

.section-card__content img:hover {
  opacity: 0.85;
}

/* Lightbox Gallery */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.92);
  opacity: 0;
  visibility: hidden;
  transition: opacity 250ms ease, visibility 250ms ease;
}

.lightbox.is-active {
  opacity: 1;
  visibility: visible;
}

.lightbox__img {
  max-width: 90vw;
  max-height: 85vh;
  object-fit: contain;
  border-radius: 4px;
  transform: scale(0.96);
  transition: transform 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

.lightbox.is-active .lightbox__img {
  transform: scale(1);
}

.lightbox__close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.7);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.lightbox__close:hover {
  color: #fff;
}

.lightbox__close svg {
  width: 24px;
  height: 24px;
}

.lightbox__arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 50%;
  color: rgba(255, 255, 255, 0.7);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.lightbox__arrow:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
}

.lightbox__arrow svg {
  width: 20px;
  height: 20px;
}

.lightbox__arrow--prev {
  left: var(--space-md);
}

.lightbox__arrow--next {
  right: var(--space-md);
}

.lightbox__counter {
  position: absolute;
  bottom: var(--space-md);
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.8125rem;
  font-variant-numeric: tabular-nums;
}

/* Responsive */
@media (max-width: 768px) {
  .header__inner {
    height: 56px;
  }

  .hero {
    padding: var(--space-lg) 0 var(--space-sm);
  }

  .case-study-hero {
    padding: var(--space-lg) 0 var(--space-md);
  }

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

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

  .lightbox__arrow {
    width: 36px;
    height: 36px;
  }

  .lightbox__arrow--prev {
    left: var(--space-xs);
  }

  .lightbox__arrow--next {
    right: var(--space-xs);
  }
}

@media (max-width: 480px) {
  .case-study-meta {
    grid-template-columns: 1fr;
  }
}

/* Staggered card entrance on home page */
.case-study-card {
  opacity: 0;
  transform: translateY(16px);
}

.case-study-card.is-visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 500ms cubic-bezier(0.4, 0, 0.2, 1),
              transform 500ms cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow var(--transition-base),
              border-color var(--transition-base);
}

/* No-JS fallback: show everything if JS doesn't run */
.no-js .section-card,
.no-js .case-study-card {
  opacity: 1;
  transform: none;
}

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

  .section-card,
  .case-study-card {
    opacity: 1;
    transform: none;
  }
}

/* Utility Classes */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}