/* ==========================================================================
   ldigital.pro - Minimalist Editorial Light Design System
   Clean, typography-driven, zero AI-slop
   ========================================================================== */

:root {
  --bg-page: #fbfbfd;
  --bg-surface: #ffffff;
  --bg-subtle: #f4f4f6;
  --bg-muted: #eef0f3;
  --bg-tag: #f1f3f5;
  
  --border-light: #e6e8ec;
  --border-hover: #cbd0d8;
  --border-dark: #18181b;

  --text-main: #111418;
  --text-secondary: #525866;
  --text-muted: #868e96;
  --text-accent: #2563eb;

  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Plus Jakarta Sans', var(--font-sans);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: rgba(251, 251, 253, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--text-main);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.logo-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: #111418;
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0;
}

.logo-text span {
  color: var(--text-muted);
  font-weight: 500;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.15s ease;
}

.nav-link:hover {
  color: var(--text-main);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.95rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background-color: #111418;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background-color 0.15s ease;
}

.header-cta:hover {
  background-color: #27272a;
}

/* Hero Section */
.hero-section {
  padding: 4.5rem 0 3.5rem;
  border-bottom: 1px solid var(--border-light);
}

.hero-content {
  max-width: 820px;
}

.hero-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4.5vw, 3.1rem);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.03em;
  color: var(--text-main);
  margin-bottom: 1.25rem;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 720px;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.6rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.15s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background-color: #111418;
  color: #ffffff;
}

.btn-primary:hover {
  background-color: #27272a;
}

.btn-outline {
  background-color: transparent;
  color: var(--text-main);
  border-color: var(--border-light);
}

.btn-outline:hover {
  background-color: var(--bg-surface);
  border-color: var(--border-hover);
}

/* Services Strip */
.services-section {
  padding: 3.5rem 0;
  border-bottom: 1px solid var(--border-light);
  background-color: var(--bg-surface);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem;
}

.service-item {
  display: flex;
  flex-direction: column;
}

.service-icon {
  width: 32px;
  height: 32px;
  color: var(--text-main);
  margin-bottom: 0.85rem;
}

.service-title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

.service-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 0.85rem;
}

.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: auto;
}

.service-tag {
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.15rem 0.45rem;
  background-color: var(--bg-subtle);
  color: var(--text-secondary);
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-light);
}

/* Portfolio Section */
.portfolio-section {
  padding: 4.5rem 0;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 2rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.section-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* Clean Category Filter Tabs */
.filter-tabs {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
  padding-bottom: 1.5rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--border-light);
}

.filter-tab {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.filter-tab:hover {
  color: var(--text-main);
  background-color: var(--bg-subtle);
}

.filter-tab.active {
  color: var(--text-main);
  background-color: var(--bg-surface);
  border-color: var(--border-light);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
  font-weight: 600;
}

.filter-tab svg {
  width: 14px;
  height: 14px;
}

.filter-tab-count {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* 1 Project Per Row Layout */
.portfolio-list {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.project-row {
  display: grid;
  grid-template-columns: 46% 1fr;
  gap: 2.25rem;
  align-items: flex-start;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.project-row:hover {
  border-color: var(--border-hover);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

/* Left Column: Visual Screenshot Container */
.project-media {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  background-color: #f1f3f5;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-light);
  cursor: pointer;
}

.project-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
  transition: transform 0.25s ease;
}

.project-media:hover img {
  transform: scale(1.02);
}

.media-expand-badge {
  position: absolute;
  bottom: 0.75rem;
  right: 0.75rem;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid var(--border-light);
  color: var(--text-main);
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-xs);
  font-size: 0.75rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
}

/* Right Column: Case Study Details */
.project-body {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.project-category {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

.project-title {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 0.6rem;
}

.project-summary {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 1rem;
}

/* Flow Steps Section */
.flow-container {
  background-color: var(--bg-subtle);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  margin-bottom: 1rem;
  border: 1px solid var(--border-light);
}

.flow-heading {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.flow-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.flow-item {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.flow-step-num {
  flex-shrink: 0;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background-color: #ffffff;
  color: var(--text-main);
  border: 1px solid var(--border-light);
  font-size: 0.65rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

/* Outcomes List */
.outcomes-container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.1rem;
}

.outcome-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  font-weight: 500;
  color: #1e40af;
  background-color: #eff6ff;
  border: 1px solid #dbeafe;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-xs);
}

.outcome-pill svg {
  width: 12px;
  height: 12px;
  stroke: #2563eb;
}

/* Tools Footer */
.project-tools {
  margin-top: auto;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-light);
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.tool-tag {
  font-size: 0.73rem;
  font-weight: 500;
  color: var(--text-secondary);
  background-color: var(--bg-tag);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-light);
}

/* Contact Section */
.contact-section {
  padding: 4.5rem 0;
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-light);
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 3rem;
  align-items: flex-start;
}

.contact-info-title {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
  margin-bottom: 0.75rem;
}

.contact-info-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.75rem;
}

.contact-channels {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.channel-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-decoration: none;
}

.channel-item:hover {
  color: var(--text-main);
}

.channel-icon {
  width: 18px;
  height: 18px;
  color: var(--text-muted);
}

/* Contact Form */
.contact-form-box {
  background-color: var(--bg-page);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 0.65rem 0.9rem;
  font-family: inherit;
  font-size: 0.9rem;
  color: var(--text-main);
  background-color: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: #111418;
  box-shadow: 0 0 0 3px rgba(17, 20, 24, 0.08);
}

.form-textarea {
  resize: vertical;
  min-height: 110px;
}

.form-submit-btn {
  width: 100%;
  padding: 0.75rem;
}

#form-message {
  margin-top: 1rem;
  font-size: 0.875rem;
  text-align: center;
  font-weight: 500;
}

#form-message.success {
  color: #15803d;
}

#form-message.error {
  color: #b91c1c;
}

/* Lightbox Modal */
.lightbox-modal {
  position: fixed;
  inset: 0;
  background-color: rgba(17, 20, 24, 0.75);
  backdrop-filter: blur(8px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.lightbox-modal.active {
  opacity: 1;
  pointer-events: auto;
}

.lightbox-dialog {
  max-width: 980px;
  width: 100%;
  max-height: 90vh;
  background-color: #ffffff;
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.lightbox-image-wrap {
  width: 100%;
  max-height: 75vh;
  background-color: #0d1117;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.lightbox-image-wrap img {
  max-width: 100%;
  max-height: 75vh;
  object-fit: contain;
}

.lightbox-footer {
  padding: 1rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-light);
  background-color: #ffffff;
}

.lightbox-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
}

.lightbox-close-btn {
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xs);
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
}

.lightbox-close-btn:hover {
  color: var(--text-main);
  border-color: var(--border-hover);
}

/* Footer */
.site-footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border-light);
  background-color: var(--bg-page);
}

.footer-content {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 900px) {
  .project-row {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .services-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .contact-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 640px) {
  .hero-title {
    font-size: 2rem;
  }
  
  .nav-links {
    display: none;
  }
  
  .filter-tabs {
    gap: 0.25rem;
  }
  
  .filter-tab {
    padding: 0.35rem 0.65rem;
    font-size: 0.8rem;
  }

  .footer-content {
    flex-direction: column;
    gap: 0.75rem;
    text-align: center;
  }
}