/* ===== CSS Variables ===== */
:root {
  /* Light mode colors */
  --color-bg: #ffffff;
  --color-bg-secondary: #f9fafb;
  --color-bg-tertiary: #f3f4f6;
  --color-text: #111827;
  --color-text-secondary: #4b5563;
  --color-text-tertiary: #6b7280;
  --color-border: #e5e7eb;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-accent-light: #dbeafe;
  --color-card-bg: #ffffff;
  --color-navbar-bg: rgba(255, 255, 255, 0.95);
  --color-shadow: rgba(0, 0, 0, 0.1);
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  
  /* Transitions */
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
}

/* Dark mode colors */
body.dark-mode {
  --color-bg: #111827;
  --color-bg-secondary: #1f2937;
  --color-bg-tertiary: #374151;
  --color-text: #f9fafb;
  --color-text-secondary: #d1d5db;
  --color-text-tertiary: #9ca3af;
  --color-border: #374151;
  --color-accent: #3b82f6;
  --color-accent-hover: #60a5fa;
  --color-accent-light: rgba(59, 130, 246, 0.1);
  --color-card-bg: #1f2937;
  --color-navbar-bg: rgba(17, 24, 39, 0.95);
  --color-shadow: rgba(0, 0, 0, 0.3);
}

/* ===== Dark Mode Toggle ===== */
.dark-mode-toggle {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border: none;
  background-color: var(--color-card-bg);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 4px 12px var(--color-shadow);
  transition: all var(--transition-base);
}

.dark-mode-toggle:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 16px var(--color-shadow);
}

.dark-mode-toggle svg {
  width: 1.5rem;
  height: 1.5rem;
  color: var(--color-text);
}

/* ===== Base Styles ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
}

.heading-1 {
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  margin-bottom: 1rem;
}

.heading-2 {
  font-size: clamp(2rem, 4vw, 2.5rem);
  margin-bottom: 1rem;
}

.heading-3 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  margin-bottom: 0.5rem;
}

/* ===== Layout ===== */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

@media (min-width: 640px) {
  .container {
    padding: 0 var(--spacing-md);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--spacing-lg);
  }
}

.section {
  padding: 4rem 0;
}

@media (min-width: 768px) {
  .section {
    padding: 6rem 0;
  }
}

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.navbar.scrolled {
  background-color: var(--color-navbar-bg);
  backdrop-filter: blur(8px);
  box-shadow: 0 2px 8px var(--color-shadow);
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

@media (min-width: 768px) {
  .navbar-container {
    height: 5rem;
  }
}

.navbar-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition-base);
}

.navbar-brand:hover {
  color: var(--color-accent);
}

@media (min-width: 768px) {
  .navbar-brand {
    font-size: 1.5rem;
  }
}

.navbar-menu {
  display: none;
  align-items: center;
  gap: 2rem;
}

@media (min-width: 768px) {
  .navbar-menu {
    display: flex;
  }
}

.navbar-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-base);
  cursor: pointer;
  background: none;
  border: none;
  font-size: 1rem;
}

.navbar-link:hover {
  color: var(--color-accent);
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.icon-button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: none;
  background-color: transparent;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: background-color var(--transition-base);
}

.icon-button:hover {
  background-color: var(--color-bg-tertiary);
}

.icon-button svg {
  width: 1.25rem;
  height: 1.25rem;
  color: var(--color-text-secondary);
}

.mobile-menu {
  display: none;
  padding: 1rem 0;
  border-top: 1px solid var(--color-border);
}

.mobile-menu.active {
  display: block;
}

.mobile-menu-link {
  display: block;
  padding: 0.75rem 0;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-base);
  cursor: pointer;
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  font-size: 1rem;
}

.mobile-menu-link:hover {
  color: var(--color-accent);
}

@media (min-width: 768px) {
  .mobile-menu {
    display: none !important;
  }
  
  .mobile-menu-toggle {
    display: none;
  }
}

/* ===== Hero Section ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 1rem;
  padding-bottom: 2rem;
  background: linear-gradient(to bottom right, var(--color-bg-secondary), var(--color-bg));
}

.hero-content {
  max-width: 56rem;
  text-align: center;
}

.hero-profile-image {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 2rem;
  display: block;
  border: 4px solid var(--color-accent);
  box-shadow: 0 8px 24px var(--color-shadow);
}

.hero-title {
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: clamp(1.5rem, 3vw, 1.875rem);
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.hero-tagline {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  color: var(--color-text-secondary);
  font-weight: 500;
  margin-bottom: 1.5rem;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: 2.5rem;
  max-width: 42rem;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  justify-content: center;
}

@media (min-width: 640px) {
  .hero-buttons {
    flex-direction: row;
  }
}

.hero-bio-section {
  text-align: left;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-weight: 500;
  border-radius: 0.5rem;
  cursor: pointer;
  border: none;
  font-size: 1rem;
  transition: all var(--transition-base);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-accent);
  color: white;
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-2px);
}

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

.btn-secondary:hover {
  background-color: var(--color-border);
}

.btn svg {
  width: 1.25rem;
  height: 1.25rem;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ===== Card ===== */
.card {
  background-color: var(--color-card-bg);
  border-radius: 0.75rem;
  padding: 1.5rem;
  box-shadow: 0 4px 6px -1px var(--color-shadow);
  transition: all var(--transition-slow);
  border: 2px solid transparent;
}

.card:hover {
  box-shadow: 0 10px 15px -3px var(--color-shadow);
  transform: translateY(-2px);
}

.card-highlight:hover {
  border-color: var(--color-accent);
}

/* ===== Grid ===== */
.grid {
  display: grid;
  gap: 2rem;
}

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

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

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

/* ===== Section Styles ===== */
.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-subheading {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 42rem;
  margin: 0 auto;
}

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

/* ===== Services ===== */
.service-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.service-header {
  display: flex;
  align-items: start;
  gap: 1rem;
  margin-bottom: 1rem;
}

.service-icon {
  padding: 0.75rem;
  background-color: var(--color-accent-light);
  border-radius: 0.5rem;
  transition: background-color var(--transition-base);
  flex-shrink: 0;
}

.service-card:hover .service-icon {
  background-color: var(--color-accent);
}

.service-icon svg {
  width: 1.5rem;
  height: 1.5rem;
  color: var(--color-accent);
}

.service-card:hover .service-icon svg {
  color: white;
}

.service-description {
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
}

.service-outcomes-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.75rem;
}

.service-outcomes {
  list-style: none;
}

.service-outcomes li {
  display: flex;
  align-items: start;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.service-outcomes li::before {
  content: "✓";
  color: var(--color-accent);
  font-weight: 700;
  flex-shrink: 0;
}

/* ===== Process Timeline ===== */
.process-timeline {
  max-width: 64rem;
  margin: 0 auto;
  position: relative;
}

.process-timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--color-accent-light);
  transform: translateX(-50%);
  display: none;
}

@media (min-width: 768px) {
  .process-timeline::before {
    display: block;
  }
}

.process-step {
  margin-bottom: 3rem;
  position: relative;
}

@media (min-width: 768px) {
  .process-step:nth-child(odd) {
    padding-right: 50%;
  }
  
  .process-step:nth-child(even) {
    padding-left: 50%;
    text-align: right;
  }
}

.process-step-content {
  position: relative;
}

.process-step-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.process-step-number {
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.25rem;
  flex-shrink: 0;
  z-index: 10;
}

.process-step-duration {
  font-size: 0.875rem;
  color: var(--color-accent);
  font-weight: 500;
}

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

/* ===== Case Studies ===== */
.case-study-category {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  background-color: var(--color-accent-light);
  color: var(--color-accent);
  border-radius: 1rem;
  margin-bottom: 0.75rem;
}

.case-study-section {
  margin-bottom: 1rem;
}

.case-study-section h4 {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.case-study-section p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.case-study-results {
  list-style: none;
}

.case-study-results li {
  display: flex;
  align-items: start;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.case-study-results li::before {
  content: "●";
  color: #10b981;
  flex-shrink: 0;
}

/* ===== Tech Stack ===== */
.tech-category {
  margin-bottom: 1rem;
}

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

.tech-tag {
  padding: 0.5rem 0.75rem;
  background-color: var(--color-bg-tertiary);
  color: var(--color-text);
  border-radius: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--transition-base);
}

.tech-tag:hover {
  background-color: var(--color-accent-light);
  color: var(--color-accent);
}

/* ===== Certifications ===== */
.certifications-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1rem;
}

@media (min-width: 640px) {
  .certifications-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Legacy certification item (simple text with checkmark) */
.certification-item {
  display: flex;
  align-items: start;
  gap: 0.5rem;
  padding: 0.75rem;
  background-color: var(--color-bg-secondary);
  border-radius: 0.5rem;
}

.certification-item::before {
  content: "✓";
  color: var(--color-accent);
  font-weight: 700;
  flex-shrink: 0;
}

.certification-item span {
  font-size: 0.875rem;
  color: var(--color-text);
}

/* New certification card with badge image */
.certification-card {
  background-color: var(--color-bg-secondary);
  border-radius: 0.75rem;
  padding: 1rem;
  transition: all var(--transition-base);
  border: 2px solid transparent;
  height: 100%;
}

.certification-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--color-shadow);
}

.cert-link,
.cert-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.75rem;
  text-decoration: none;
  color: inherit;
  height: 100%;
}

.cert-link:hover {
  color: var(--color-accent);
}

.cert-badge {
  width: 100%;
  max-width: 120px;
  height: auto;
  object-fit: contain;
  margin: 0 auto;
  display: block;
}

.cert-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  width: 100%;
}

.cert-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.4;
}

.cert-issuer {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

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

.cert-link:hover .cert-name {
  color: var(--color-accent);
}

/* ===== About ===== */
.about-content {
  max-width: 56rem;
  margin: 0 auto;
}

.about-bio {
  margin-bottom: 3rem;
}

.about-bio p {
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
}

.collaboration-card {
  background: linear-gradient(to bottom right, var(--color-accent-light), rgba(96, 165, 250, 0.1));
  border: 2px solid var(--color-accent);
}

.collaboration-list {
  list-style: none;
}

.collaboration-list li {
  display: flex;
  align-items: start;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.collaboration-number {
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 0.125rem;
}

.collaboration-list li span {
  color: var(--color-text-secondary);
}

/* ===== Contact ===== */
.contact-grid {
  display: grid;
  gap: 2rem;
}

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

.contact-info-card {
  margin-bottom: 1.5rem;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1rem;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-base);
  padding: 0.5rem;
  border-radius: 0.5rem;
}

.contact-link:hover {
  color: var(--color-accent);
  background-color: var(--color-bg-secondary);
}

.contact-link-icon {
  padding: 0.5rem;
  background-color: var(--color-accent-light);
  border-radius: 0.5rem;
  transition: background-color var(--transition-base);
}

.contact-link:hover .contact-link-icon {
  background-color: var(--color-accent);
}

.contact-link-icon svg {
  width: 1.25rem;
  height: 1.25rem;
  color: var(--color-accent);
}

.contact-link:hover .contact-link-icon svg {
  color: white;
}

.contact-link-text p:first-child {
  font-size: 0.875rem;
  font-weight: 600;
}

.contact-link-text p:last-child {
  font-size: 0.875rem;
}

.contact-note {
  padding: 1rem;
  background-color: var(--color-accent-light);
  border: 1px solid var(--color-accent);
  border-radius: 0.75rem;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.contact-note strong {
  color: var(--color-text);
}

/* ===== Form ===== */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-size: 1rem;
  font-family: var(--font-sans);
  transition: all var(--transition-base);
}

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

.form-textarea {
  resize: vertical;
  min-height: 150px;
}

.form-error {
  margin-top: 0.25rem;
  font-size: 0.875rem;
  color: #ef4444;
}

.form-alert {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  margin-top: 1rem;
}

.form-alert-success {
  background-color: rgba(16, 185, 129, 0.1);
  border: 1px solid #10b981;
  color: #059669;
}

.form-alert-error {
  background-color: rgba(239, 68, 68, 0.1);
  border: 1px solid #ef4444;
  color: #dc2626;
}

.form-alert svg {
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
}

.honeypot {
  position: absolute;
  left: -9999px;
  opacity: 0;
}

/* ===== Footer ===== */
.footer {
  background-color: #111827;
  color: #d1d5db;
  padding: 3rem 0;
}

body.dark-mode .footer {
  background-color: #000000;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

@media (min-width: 768px) {
  .footer-content {
    flex-direction: row;
    justify-content: space-between;
  }
}

.footer-info {
  text-align: center;
}

@media (min-width: 768px) {
  .footer-info {
    text-align: left;
  }
}

.footer-name {
  font-weight: 600;
  color: white;
  margin-bottom: 0.25rem;
}

.footer-location {
  font-size: 0.875rem;
}

.footer-social {
  display: flex;
  gap: 1rem;
}

.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 0.5rem;
  transition: background-color var(--transition-base);
  color: #d1d5db;
}

.footer-social a:hover {
  background-color: #1f2937;
}

.footer-social svg {
  width: 1.25rem;
  height: 1.25rem;
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid #374151;
  text-align: center;
  font-size: 0.875rem;
}

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

.spinner {
  width: 1.25rem;
  height: 1.25rem;
  border: 2px solid white;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ===== Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive Adjustments ===== */
@media (max-width: 767px) {
  .section {
    padding: 3rem 0;
  }
  
  .section-header {
    margin-bottom: 2rem;
  }
  
  .grid {
    gap: 1.5rem;
  }
}