/* ==========================================================================
   COMPONENTS DESIGN SYSTEM
   MD. YEASIR ARAFAT — ELECTRICAL & ELECTRONIC PORTFOLIO
   ========================================================================== */

/* --------------------------------------------------------------------------
   SITE HEADER & NAVIGATION
   -------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--bg-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: var(--z-header);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.site-header.scrolled {
  box-shadow: var(--shadow-sm);
  background: var(--bg-glass);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Monogram Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  text-decoration: none;
}

.logo-badge {
  width: 38px;
  height: 38px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  box-shadow: 0 0 12px rgba(var(--accent-cyan-rgb), 0.2);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.brand-logo:hover .logo-badge {
  transform: scale(1.05);
  box-shadow: var(--shadow-glow);
}

.logo-text-group {
  display: flex;
  flex-direction: column;
}

.logo-name {
  font-size: 1.05rem;
  line-height: 1.15;
}

.logo-role {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent-cyan);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* Desktop Navigation */
.desktop-nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.nav-link {
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  position: relative;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background-color: var(--border-subtle);
}

.nav-link.active {
  color: var(--accent-cyan);
  font-weight: 600;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0.85rem;
  right: 0.85rem;
  height: 2px;
  background-color: var(--accent-cyan);
  border-radius: var(--radius-full);
  box-shadow: 0 0 8px var(--accent-cyan);
}

/* Header Action Buttons */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  border-color: var(--border-accent);
  color: var(--accent-cyan);
  box-shadow: var(--shadow-sm);
}

.theme-icon-sun, .theme-icon-moon {
  width: 18px;
  height: 18px;
  transition: transform var(--transition-normal);
}

:root[data-theme="dark"] .theme-icon-moon,
:root:not([data-theme="light"]) .theme-icon-moon {
  display: none;
}

:root[data-theme="dark"] .theme-icon-sun,
:root:not([data-theme="light"]) .theme-icon-sun {
  display: block;
  color: #fbbf24;
}

:root[data-theme="light"] .theme-icon-sun {
  display: none;
}

:root[data-theme="light"] .theme-icon-moon {
  display: block;
  color: var(--accent-blue);
}

/* Mobile Menu Toggle */
.mobile-nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

/* Mobile Drawer Overlay */
.mobile-drawer {
  position: fixed;
  inset: 0;
  background: rgba(5, 8, 14, 0.75);
  backdrop-filter: blur(8px);
  z-index: var(--z-drawer);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.mobile-drawer.open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-drawer-content {
  position: absolute;
  top: 0;
  right: 0;
  width: 82%;
  max-width: 340px;
  height: 100%;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-subtle);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
}

.mobile-drawer.open .mobile-drawer-content {
  transform: translateX(0);
}

.mobile-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 1.5rem;
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.mobile-nav-link {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-primary);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mobile-nav-link.active {
  background: var(--badge-bg);
  color: var(--accent-cyan);
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   BUTTONS
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 0.8rem 1.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.97);
}

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

.btn svg {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-blue) 100%);
  color: #040810;
  border-color: rgba(var(--accent-cyan-rgb), 0.4);
  box-shadow: 0 4px 18px rgba(var(--accent-cyan-rgb), 0.25);
}

.btn-primary:hover {
  color: #000000;
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(var(--accent-cyan-rgb), 0.45);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.btn-secondary:hover {
  background: var(--bg-elevated);
  border-color: var(--border-accent);
  color: var(--accent-cyan);
  transform: translateY(-2px);
}

.btn-accent {
  background: linear-gradient(135deg, #0ea5e9 0%, #2563eb 100%);
  color: #ffffff;
  border-color: rgba(14, 165, 233, 0.4);
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.3);
}

.btn-accent:hover {
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(37, 99, 235, 0.5);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.82rem;
}

/* --------------------------------------------------------------------------
   CARDS & TECHNICAL CONTAINERS
   -------------------------------------------------------------------------- */
.tech-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: clamp(1.25rem, 3vw, 2rem);
  position: relative;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.tech-card:hover {
  border-color: var(--border-accent);
  box-shadow: var(--shadow-md);
}

/* Subtle corner technical marks */
.tech-card::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 14px;
  width: 18px;
  height: 2px;
  background: var(--accent-cyan);
  opacity: 0.7;
}

/* --------------------------------------------------------------------------
   EXPERIENCE TIMELINE
   -------------------------------------------------------------------------- */
.timeline {
  position: relative;
  padding-left: 2rem;
  display: flex;
  flex-direction: column;
  gap: 2.25rem;
}

/* Vertical electrical conductor trace */
.timeline::before {
  content: '';
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-cyan) 0%, var(--accent-blue) 60%, var(--border-subtle) 100%);
}

.timeline-item {
  position: relative;
}

/* Circuit node connector */
.timeline-node {
  position: absolute;
  top: 1.4rem;
  left: -2rem;
  transform: translateX(-5px);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2px solid var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
  z-index: 2;
}

.timeline-item:hover .timeline-node {
  background: var(--accent-cyan);
}

.timeline-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.75rem;
  transition: all var(--transition-normal);
}

.timeline-card:hover {
  border-color: var(--border-accent);
  box-shadow: var(--shadow-md);
}

.timeline-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.timeline-role {
  font-size: 1.3rem;
  color: var(--text-primary);
  font-weight: 700;
}

.timeline-company {
  font-size: 1rem;
  color: var(--accent-cyan);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.2rem;
}

.timeline-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.timeline-badge {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--badge-border);
}

.timeline-badge.status-present {
  background: rgba(16, 185, 129, 0.12);
  color: #10b981;
  border-color: rgba(16, 185, 129, 0.3);
}

.timeline-summary {
  font-size: 0.96rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.timeline-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: none;
  border: none;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.3rem 0;
  transition: opacity var(--transition-fast);
}

.timeline-toggle-btn:hover {
  opacity: 0.85;
}

.timeline-toggle-btn svg {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-fast);
}

.timeline-toggle-btn.expanded svg {
  transform: rotate(180deg);
}

.timeline-details {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}

.timeline-details.open {
  max-height: 500px;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--border-subtle);
}

.responsibility-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.responsibility-list li {
  font-size: 0.92rem;
  color: var(--text-secondary);
  position: relative;
  padding-left: 1.35rem;
}

.responsibility-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
  font-size: 0.9rem;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.tech-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-xs);
  background: var(--bg-tertiary);
  color: var(--text-tertiary);
  border: 1px solid var(--border-subtle);
}

/* --------------------------------------------------------------------------
   EDUCATION & QUALIFICATIONS
   -------------------------------------------------------------------------- */
.edu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.edu-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
}

.edu-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.edu-degree {
  font-size: 1.15rem;
  margin-bottom: 0.35rem;
}

.edu-institution {
  font-size: 0.95rem;
  color: var(--accent-cyan);
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.edu-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-subtle);
}

/* Certification Grid & Filters */
.cert-filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
  justify-content: center;
}

.cert-filter-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.cert-filter-btn:hover {
  border-color: var(--border-medium);
  color: var(--text-primary);
}

.cert-filter-btn.active {
  background: var(--badge-bg);
  border-color: var(--border-accent);
  color: var(--accent-cyan);
  font-weight: 600;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.25rem;
}

.cert-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.75rem;
  transition: all var(--transition-fast);
}

.cert-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.cert-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.5rem;
}

.cert-title {
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-primary);
}

.cert-issuer {
  font-size: 0.84rem;
  color: var(--text-tertiary);
}

.cert-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 0.65rem;
  border-top: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.74rem;
}

/* --------------------------------------------------------------------------
   SKILLS MATRIX
   -------------------------------------------------------------------------- */
.skills-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
}

.skills-group-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.skills-group-header {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.skills-group-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: var(--badge-bg);
  border: 1px solid var(--border-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
}

.skills-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.skill-row {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  transition: border-color var(--transition-fast);
}

.skill-row:hover {
  border-color: var(--border-accent);
}

.skill-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.skill-name {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
}

.skill-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-cyan);
  background: var(--badge-bg);
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-xs);
}

.skill-desc {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  line-height: 1.35;
}

/* --------------------------------------------------------------------------
   ACHIEVEMENTS
   -------------------------------------------------------------------------- */
.achievements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.achievement-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
  transition: all var(--transition-normal);
}

.achievement-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.ach-meta-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.ach-org {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--accent-cyan);
}

.ach-year {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-tertiary);
}

.ach-title {
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-top: 0.25rem;
}

.ach-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.ach-badge-code {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-green);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-xs);
  display: inline-block;
  align-self: flex-start;
}

/* --------------------------------------------------------------------------
   ELECTRICAL RESOURCES HERO BANNER
   -------------------------------------------------------------------------- */
.resource-banner {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-xl);
  padding: clamp(2rem, 5vw, 3.5rem);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-glow);
}

.resource-banner::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 350px;
  height: 350px;
  background: radial-gradient(circle, rgba(var(--accent-cyan-rgb), 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.resource-content {
  max-width: 680px;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  position: relative;
  z-index: 2;
}

.resource-heading {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
}

.resource-features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 0.75rem;
  margin-bottom: 1.25rem;
}

.resource-feature-item {
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.resource-feature-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--accent-cyan);
  margin-bottom: 0.35rem;
}

.resource-feature-text {
  font-size: 0.82rem;
  color: var(--text-tertiary);
  line-height: 1.4;
}

/* --------------------------------------------------------------------------
   CONTACT SECTION & FORM
   -------------------------------------------------------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(2rem, 4vw, 3.5rem);
}

.contact-info-card {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.contact-item:hover {
  border-color: var(--border-accent);
  transform: translateX(4px);
  background: var(--bg-tertiary);
}

.contact-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: var(--badge-bg);
  border: 1px solid var(--border-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  flex-shrink: 0;
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
}

.contact-val {
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--text-primary);
}

.social-links-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.social-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.social-pill:hover {
  border-color: var(--border-accent);
  color: var(--accent-cyan);
  transform: translateY(-2px);
}

.social-pill svg {
  width: 16px;
  height: 16px;
}

/* Contact Form */
.contact-form-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 3vw, 2.5rem);
}

.form-group {
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-input, .form-textarea {
  width: 100%;
  padding: 0.8rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

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

.form-textarea {
  min-height: 130px;
  resize: vertical;
}

.form-feedback {
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  margin-bottom: 1.25rem;
  display: none;
}

.form-feedback.success {
  display: block;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #10b981;
}

.form-feedback.error {
  display: block;
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #ef4444;
}

/* --------------------------------------------------------------------------
   FOOTER
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding-top: 4rem;
  padding-bottom: 2.5rem;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: clamp(2rem, 4vw, 3.5rem);
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border-subtle);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-tagline {
  font-size: 0.9rem;
  color: var(--text-secondary);
  max-width: 36ch;
}

.footer-nav-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}

.footer-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-nav-list a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-nav-list a:hover {
  color: var(--accent-cyan);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding-top: 2rem;
  font-size: 0.85rem;
  color: var(--text-tertiary);
}

.back-to-top-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.back-to-top-btn:hover {
  border-color: var(--border-accent);
  color: var(--accent-cyan);
}

/* --------------------------------------------------------------------------
   RESPONSIVE COMPONENT RULES
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .desktop-nav {
    display: none;
  }
  .mobile-nav-toggle {
    display: flex;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .brand-logo {
    gap: 0.5rem;
  }
  .logo-badge {
    width: 34px;
    height: 34px;
    font-size: 0.75rem;
    border-radius: var(--radius-xs);
  }
  .logo-name {
    font-size: 0.92rem;
    white-space: nowrap;
  }
  .logo-role {
    display: none;
  }
  .header-actions {
    gap: 0.45rem;
    flex-shrink: 0;
  }
  .theme-toggle-btn, .mobile-nav-toggle {
    width: 36px;
    height: 36px;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .timeline {
    padding-left: 1.5rem;
  }
  .timeline::before {
    left: 4px;
  }
  .timeline-node {
    left: -1.5rem;
    transform: translateX(-4px);
  }
  .cert-grid {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   GLASSMORPHISM DESIGN SYSTEM (Section 3)
   ========================================================================== */
.glass-card {
  position: relative;
  overflow: hidden;
  isolation: isolate;

  background: var(--glass-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);

  border: 1px solid var(--glass-border);
  border-radius: 20px;

  box-shadow:
    var(--glass-shadow),
    inset 0 1px 0 var(--glass-specular-top),
    inset 0 -1px 0 rgba(255, 255, 255, 0.05),
    inset 0 0 16px 4px var(--glass-inner-glow);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.glass-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;

  background: linear-gradient(
    90deg,
    transparent,
    var(--glass-specular-top),
    transparent
  );

  pointer-events: none;
  z-index: 1;
}

.glass-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 100%;

  background: linear-gradient(
    180deg,
    var(--glass-specular-top),
    transparent,
    var(--glass-specular-left)
  );

  pointer-events: none;
  z-index: 1;
}

.glass-card:hover {
  border-color: var(--border-accent-strong);
  box-shadow: var(--shadow-glow), var(--glass-shadow);
  transform: translateY(-3px);
}

/* Ensure absolute spec pills maintain absolute positioning when using glass-card */
.tech-spec-pill.glass-card {
  position: absolute !important;
}

/* Graceful solid/translucent fallback when backdrop-filter is unsupported */
@supports not ((-webkit-backdrop-filter: blur(1px)) or (backdrop-filter: blur(1px))) {
  .glass-card {
    background: var(--bg-elevated);
  }
  .site-header {
    background: var(--bg-secondary);
  }
  .contact-modal-dialog {
    background: var(--bg-secondary);
  }
  .tech-spec-pill {
    background: var(--bg-elevated);
  }
}

/* Button light sweep / shine animation */
.btn-primary {
  position: relative;
  overflow: hidden;
}

.btn-primary::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -60%;
  width: 40%;
  height: 200%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.45), transparent);
  transform: rotate(25deg);
  pointer-events: none;
  transition: none;
  opacity: 0;
}

.btn-primary:hover::after {
  opacity: 1;
  animation: btnSweep 1.2s ease-in-out infinite;
}

@keyframes btnSweep {
  0% { left: -60%; }
  100% { left: 140%; }
}

/* Arrow move animation on hover */
.btn:hover svg.arrow-icon,
.btn:hover svg {
  transform: translateX(3px);
  transition: transform var(--transition-fast);
}

/* ==========================================================================
   CONTACT MODAL DIALOG (Section 8)
   ========================================================================== */
.contact-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(4, 7, 12, 0.78);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.contact-modal-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.contact-modal-dialog {
  width: 100%;
  max-width: 580px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-accent-strong);
  border-radius: var(--radius-xl);
  padding: clamp(1.5rem, 3.5vw, 2.25rem);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.75), 0 0 30px rgba(var(--accent-cyan-rgb), 0.25);
  transform: scale(0.92) translateY(15px);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
  position: relative;
  max-height: 90vh;
  overflow-y: auto;
}

.contact-modal-backdrop.open .contact-modal-dialog {
  transform: scale(1) translateY(0);
}

.modal-close-btn {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-accent);
  transform: scale(1.05);
}

.modal-title-group {
  margin-bottom: 1.25rem;
  padding-right: 2.5rem;
}

.modal-title {
  font-size: 1.4rem;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.modal-subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.message-preview-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
  font-size: 0.86rem;
  max-height: 160px;
  overflow-y: auto;
  border-left: 3px solid var(--accent-cyan);
}

.preview-field {
  margin-bottom: 0.35rem;
  color: var(--text-secondary);
}

.preview-field strong {
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.preview-body-text {
  margin-top: 0.65rem;
  padding-top: 0.65rem;
  border-top: 1px dashed var(--border-subtle);
  color: var(--text-primary);
  white-space: pre-wrap;
  font-family: var(--font-body);
  line-height: 1.45;
}

.dispatch-options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

@media (max-width: 520px) {
  .dispatch-options-grid {
    grid-template-columns: 1fr;
  }
}

.btn-dispatch {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  padding: 1.15rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  font-weight: 600;
  text-align: center;
  transition: all var(--transition-fast);
}

.btn-dispatch-whatsapp {
  background: linear-gradient(135deg, #25D366 0%, #128C7E 100%);
  color: #ffffff;
  border-color: rgba(37, 211, 102, 0.4);
  box-shadow: 0 6px 20px rgba(37, 211, 102, 0.35);
}

.btn-dispatch-whatsapp:hover {
  color: #ffffff;
  transform: translateY(-3px);
  box-shadow: 0 8px 26px rgba(37, 211, 102, 0.55);
}

.btn-dispatch-email {
  background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-blue) 100%);
  color: #040810;
  border-color: rgba(var(--accent-cyan-rgb), 0.4);
  box-shadow: 0 6px 20px rgba(var(--accent-cyan-rgb), 0.3);
}

.btn-dispatch-email:hover {
  color: #000000;
  transform: translateY(-3px);
  box-shadow: 0 8px 26px rgba(var(--accent-cyan-rgb), 0.5);
}

.btn-dispatch-icon {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-dispatch-icon svg {
  width: 24px;
  height: 24px;
}

.btn-dispatch-title {
  font-size: 0.96rem;
  line-height: 1.2;
}

.btn-dispatch-desc {
  font-size: 0.74rem;
  opacity: 0.88;
  font-weight: 400;
}

.modal-actions-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.85rem;
}

.btn-ghost {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-xs);
  transition: color var(--transition-fast);
}

.btn-ghost:hover {
  color: var(--accent-cyan);
}

/* ==========================================================================
   FLOATING WHATSAPP & ACTIONS (Section 10)
   ========================================================================== */
.floating-actions-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.75rem;
  z-index: var(--z-header);
}

.floating-whatsapp-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #25D366;
  color: #ffffff;
  border: none;
  box-shadow: 0 4px 18px rgba(37, 211, 102, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
}

.floating-whatsapp-btn:hover {
  transform: scale(1.08);
  box-shadow: 0 6px 24px rgba(37, 211, 102, 0.65);
  color: #ffffff;
}

.floating-whatsapp-btn svg {
  width: 26px;
  height: 26px;
  fill: currentColor;
}

.floating-whatsapp-btn::before {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  border: 2px solid #25D366;
  opacity: 0.7;
  animation: pulseRing 2.4s cubic-bezier(0.215, 0.61, 0.355, 1) infinite;
  pointer-events: none;
}

@keyframes pulseRing {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 0; }
  100% { transform: scale(1.3); opacity: 0; }
}

@media (max-width: 640px) {
  .floating-actions-container {
    bottom: 16px;
    right: 16px;
  }
  .floating-whatsapp-btn {
    width: 42px;
    height: 42px;
  }
  .floating-whatsapp-btn svg {
    width: 22px;
    height: 22px;
  }
}