/* ==========================================================================
   DIGITAL LINK - UI Component Styles
   ========================================================================== */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--accent);
  color: #FFFFFF;
  box-shadow: 0 0 20px var(--accent-glow);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px var(--accent-glow);
}

.btn-outline {
  background-color: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-color-light);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background-color: rgba(0, 82, 255, 0.06);
}

.btn-sm {
  padding: 9px 18px;
  font-size: 0.8125rem;
}

/* SECTION 01: HERO */
.hero-section {
  position: relative;
  min-height: auto;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: calc(var(--header-height) + 40px);
  padding-bottom: 40px;
  overflow: hidden;
  background-color: var(--bg-dark);
}

#heroCanvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
  opacity: 0.65;
}

.hero-container {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--container-max);
  padding: 0 24px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 12px;
}

.hero-badge .dot {
  width: 6px;
  height: 6px;
  background-color: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent);
}

.hero-title {
  font-size: clamp(3.2rem, 8vw, 7.5rem);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.04em;
  margin-bottom: 12px;
  text-transform: uppercase;
}

.hero-title .line-break {
  display: block;
}

.hero-title .highlight-text {
  background: linear-gradient(135deg, #FFFFFF 0%, #A3A3A3 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-slogan-box {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.hero-slogan {
  font-size: clamp(1.125rem, 2.5vw, 1.75rem);
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: -0.01em;
}

.hero-slogan .symbol {
  color: var(--accent);
  margin: 0 4px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-scroll-down {
  display: none;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translate(-50%, 0); }
  40% { transform: translate(-50%, -8px); }
  60% { transform: translate(-50%, -4px); }
}

/* SECTION 02: BRAND MESSAGE & CONNECTION FLOW */
.section-padding {
  padding: 40px 0;
  position: relative;
}

@media (max-width: 768px) {
  .section-padding {
    padding: 28px 0;
  }
}

.brand-section {
  border-bottom: 1px solid var(--border-color);
}

.brand-quote {
  font-size: clamp(1.75rem, 3.5vw, 3rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.brand-subtext {
  font-size: 1.125rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

/* Connection Architecture Diagram */
.connection-flow-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 24px;
  position: relative;
}

@media (max-width: 868px) {
  .connection-flow-grid {
    grid-template-columns: 1fr;
  }
}

.flow-step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  position: relative;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.flow-step-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}

.flow-number {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.flow-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.flow-desc {
  font-size: 0.9375rem;
  color: var(--text-muted);
}

/* SECTION 03: SERVICES */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 36px;
}

@media (max-width: 991px) {
  .services-grid {
    grid-template-columns: 1fr;
  }
}

.service-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px 36px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 480px;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), #00A3FF);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.service-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 82, 255, 0.4);
  background-color: var(--bg-card-hover);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.service-card:hover::before {
  opacity: 1;
}

.service-code {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 12px;
}

.service-name {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.service-subtitle {
  font-size: 0.9375rem;
  color: var(--text-subtle);
  margin-bottom: 24px;
}

.service-feature-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 36px;
}

.service-feature-item {
  font-size: 0.875rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.service-feature-item::before {
  content: '—';
  color: var(--accent);
  font-weight: 700;
}

/* SECTION 04: DIFFERENCE (4 PILLARS) */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 36px;
}

@media (max-width: 991px) {
  .pillars-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 576px) {
  .pillars-grid {
    grid-template-columns: 1fr;
  }
}

.pillar-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 36px 24px;
  transition: all var(--transition-fast);
}

.pillar-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
}

.pillar-num {
  font-size: 1.75rem;
  font-weight: 900;
  color: var(--accent);
  margin-bottom: 16px;
  font-family: var(--font-mono);
}

.pillar-title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: 0.05em;
}

.pillar-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* SECTION 05: FEATURED PROJECT SHOWCASE */
.featured-project-card {
  background: linear-gradient(135deg, #141414 0%, #0D0D0D 100%);
  border: 1px solid var(--border-color-light);
  border-radius: var(--radius-lg);
  padding: 56px 48px;
  margin-top: 36px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  position: relative;
  overflow: hidden;
}

@media (max-width: 991px) {
  .featured-project-card {
    grid-template-columns: 1fr;
    padding: 36px 24px;
  }
}

.project-meta-badge {
  display: inline-flex;
  gap: 8px;
  margin-bottom: 20px;
}

.badge-item {
  padding: 4px 12px;
  background: rgba(0, 82, 255, 0.15);
  border: 1px solid rgba(0, 82, 255, 0.4);
  color: #60A5FA;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  letter-spacing: 0.05em;
}

.project-display-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 16px;
}

.project-subtitle-kr {
  font-size: 1.125rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.project-desc-box {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  line-height: 1.7;
}

.scope-tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 36px;
}

.scope-tag {
  font-size: 0.8125rem;
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: var(--radius-full);
}

.project-visual-preview {
  width: 100%;
  height: 360px;
  background: #1A1A1A;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background: radial-gradient(circle at center, #262626 0%, #121212 100%);
}

.project-visual-preview .visual-badge {
  font-size: 2.5rem;
  font-weight: 900;
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.15);
  text-transform: uppercase;
}

.project-visual-preview .visual-label {
  font-size: 0.875rem;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.1em;
  margin-top: 12px;
}

/* SECTION 06: PROCESS */
.process-timeline {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
  margin-top: 36px;
}

@media (max-width: 1100px) {
  .process-timeline {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 600px) {
  .process-timeline {
    grid-template-columns: 1fr;
  }
}

.process-step-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 28px 20px;
  border-radius: var(--radius-md);
  position: relative;
}

.step-num {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  font-family: var(--font-mono);
  margin-bottom: 8px;
}

.step-title {
  font-size: 1.125rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.step-desc {
  font-size: 0.8125rem;
  color: var(--text-subtle);
}

/* SECTION 07: INSIGHT GRID */
.insight-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 32px;
}

@media (max-width: 991px) {
  .insight-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .insight-grid {
    grid-template-columns: 1fr;
  }
}

.insight-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.insight-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}

.insight-category {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.insight-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
}

.insight-summary {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.insight-date {
  font-size: 0.75rem;
  color: var(--text-subtle);
}

/* SECTION 08: CONTACT CTA BANNER */
.contact-cta-section {
  background: linear-gradient(180deg, var(--bg-dark) 0%, #001238 100%);
  border-top: 1px solid var(--border-color);
  padding: 70px 0;
  text-align: center;
}

.cta-box {
  max-width: 800px;
  margin: 0 auto;
}

.cta-heading {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.05;
  margin-bottom: 24px;
}

.cta-subtext {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 32px;
}

/* FOOTER */
.footer {
  background-color: #FFFFFF;
  border-top: 1px solid rgba(0, 0, 0, 0.08);
  padding: 80px 0 40px 0;
  font-size: 0.875rem;
}

.footer-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 3fr;
  gap: 64px;
  margin-bottom: 64px;
}

@media (max-width: 868px) {
  .footer-top {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

.footer-tagline {
  color: #555555;
  margin-top: 16px;
  line-height: 1.6;
}

.footer-links-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

@media (max-width: 576px) {
  .footer-links-grid {
    grid-template-columns: 1fr;
  }
}

.footer-col-title {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: #1A1A1A;
  margin-bottom: 20px;
}

.footer-menu {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-menu a {
  color: #555555;
}

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

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid rgba(0, 0, 0, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #737373;
}

.footer-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
}

.footer-badge .badge-dot {
  width: 6px;
  height: 6px;
  background-color: #10B981;
  border-radius: 50%;
}

/* MOBILE STICKY FLOATING CTA BAR */
.mobile-sticky-cta {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: 12px 16px;
  background: rgba(10, 10, 10, 0.92);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--border-color);
  z-index: 90;
}

@media (max-width: 768px) {
  .mobile-sticky-cta {
    display: block;
  }
  .footer {
    padding-bottom: 90px;
  }
}

.mobile-cta-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 14px;
  background-color: var(--accent);
  color: #FFFFFF;
  font-weight: 700;
  font-size: 0.9375rem;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 20px var(--accent-glow);
}

/* FORM ELEMENTS */
.form-group {
  margin-bottom: 24px;
  text-align: left;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
}

.form-label .required {
  color: var(--accent);
}

.form-input, .form-textarea, .form-select {
  width: 100%;
  padding: 14px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 0.9375rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-textarea {
  min-height: 140px;
  resize: vertical;
}

.form-checkbox-label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.875rem;
  color: var(--text-muted);
  cursor: pointer;
}

.form-checkbox {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}