/* Modern Portfolio CSS - Comprehensive Design System */

/* Reset and Base Styles */
*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  line-height: 1.6;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

/* Skip Link for Accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-600);
  color: white;
  padding: 8px;
  text-decoration: none;
  border-radius: var(--radius-md);
  z-index: 10000;
  font-weight: 500;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 6px;
}

/* Container and Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }
}

/* Header Styles */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(var(--bg-primary), 0.95);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-primary);
  z-index: 1000;
  transition: all var(--transition-base);
}

.nav-container {
  padding: 0;
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0;
  color: var(--text-primary);
}

.logo-highlight {
  color: var(--primary-500);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  padding: 0.5rem 0;
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link:focus {
  color: var(--text-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-500);
  transition: width var(--transition-base);
}

.nav-link:hover::after,
.nav-link:focus::after {
  width: 100%;
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.theme-toggle:hover {
  background: var(--bg-tertiary);
  transform: scale(1.05);
}

.theme-icon {
  position: absolute;
  font-size: 1.2rem;
  transition: all var(--transition-base);
}

[data-theme="dark"] .theme-icon-light {
  opacity: 1;
  transform: rotate(0deg);
}

[data-theme="dark"] .theme-icon-dark {
  opacity: 0;
  transform: rotate(180deg);
}

[data-theme="light"] .theme-icon-light {
  opacity: 0;
  transform: rotate(-180deg);
}

[data-theme="light"] .theme-icon-dark {
  opacity: 1;
  transform: rotate(0deg);
}

/* Mobile Menu */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  background: none;
  cursor: pointer;
  padding: 0;
}

.hamburger-line {
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  margin: 2px 0;
  transition: all var(--transition-base);
  transform-origin: center;
}

.mobile-menu-btn[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: -2;
}

.hero-gradient {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-700) 50%, var(--primary-900) 100%);
  opacity: 0.9;
}

.hero-pattern {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(circle at 25% 25%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 75% 75%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
  background-size: 100px 100px;
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(0px, 0px); }
  33% { transform: translate(30px, -30px); }
  66% { transform: translate(-20px, 20px); }
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  position: relative;
  z-index: 1;
}

.hero-text {
  color: white;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.1;
  margin: 0 0 1rem 0;
}

.name-highlight {
  color: var(--primary-50);
  position: relative;
}

.name-highlight::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-300), var(--primary-100));
  border-radius: 2px;
}

.hero-subtitle {
  font-size: 1.5rem;
  font-weight: 500;
  margin: 0 0 1.5rem 0;
  color: var(--primary-100);
  min-height: 2em;
}

.hero-description {
  font-size: 1.125rem;
  line-height: 1.6;
  margin: 0 0 2rem 0;
  color: var(--primary-50);
  opacity: 0.9;
}

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

/* Avatar */
.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.avatar-container {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.avatar {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  border: 4px solid rgba(255, 255, 255, 0.2);
  object-fit: cover;
  position: relative;
  z-index: 2;
  transition: transform var(--transition-slow);
}

.avatar:hover {
  transform: scale(1.05);
}

.avatar-ring {
  position: absolute;
  top: -12px;
  left: -12px;
  right: -12px;
  bottom: -12px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: var(--primary-300);
  border-right-color: var(--primary-300);
  animation: ring-rotate 3s linear infinite;
  z-index: 1;
}

@keyframes ring-rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.avatar-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.1);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-radius: 9999px;
  color: white;
  font-size: 0.875rem;
  font-weight: 500;
}

.status-dot {
  width: 8px;
  height: 8px;
  background: #10b981;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.7;
    transform: scale(1.1);
  }
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: rgba(255, 255, 255, 0.7);
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  40% {
    transform: translateX(-50%) translateY(-10px);
  }
  60% {
    transform: translateX(-50%) translateY(-5px);
  }
}

.scroll-mouse {
  width: 24px;
  height: 36px;
  border: 2px solid rgba(255, 255, 255, 0.5);
  border-radius: 12px;
  position: relative;
}

.scroll-wheel {
  width: 4px;
  height: 8px;
  background: rgba(255, 255, 255, 0.7);
  border-radius: 2px;
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  animation: scroll-wheel 2s infinite;
}

@keyframes scroll-wheel {
  0%, 100% {
    top: 6px;
    opacity: 1;
  }
  50% {
    top: 16px;
    opacity: 0.3;
  }
}

.scroll-text {
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: white;
  color: var(--primary-700);
  box-shadow: var(--shadow-lg);
}

.btn-primary:hover {
  background: var(--primary-50);
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.3);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  background: var(--bg-secondary);
  border-color: var(--primary-500);
  color: var(--primary-500);
  transform: translateY(-1px);
}

.btn-full {
  width: 100%;
  justify-content: center;
}

.btn-icon {
  flex-shrink: 0;
}

/* Section Styles */
.section {
  padding: 5rem 0;
  position: relative;
}

.section:nth-child(even) {
  background: var(--bg-secondary);
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin: 0 0 1rem 0;
  color: var(--text-primary);
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -0.5rem;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-500), var(--primary-600));
  border-radius: 2px;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin: 0;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.section-actions {
  text-align: center;
  margin-top: 3rem;
}

/* About Section */
.about-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about-text {
  font-size: 1.125rem;
  line-height: 1.7;
}

.lead {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}

.skills-section {
  margin-top: 3rem;
}

.skills-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 1.5rem 0;
  color: var(--text-primary);
}

.skills-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.skill-category h4 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.75rem 0;
  color: var(--primary-600);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: 0.375rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid var(--border-primary);
  transition: all var(--transition-fast);
}

.skill-tag:hover {
  background: var(--primary-500);
  color: white;
  border-color: var(--primary-500);
  transform: translateY(-1px);
}

/* Stats */
.about-stats {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.stat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: 2rem;
  text-align: center;
  transition: all var(--transition-base);
}

.stat-card:hover {
  background: var(--bg-tertiary);
  border-color: var(--primary-500);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-600);
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.project-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.project-card:hover {
  border-color: var(--primary-500);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-500), var(--primary-600));
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.project-card:hover::before {
  transform: scaleX(1);
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  margin-bottom: 1rem;
}

.project-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0;
  color: var(--text-primary);
}

.project-link {
  color: var(--text-tertiary);
  transition: color var(--transition-fast);
}

.project-link:hover {
  color: var(--primary-500);
}

.project-description {
  color: var(--text-secondary);
  margin: 0 0 1.5rem 0;
  line-height: 1.6;
}

.project-languages {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: auto;
}

.language-tag {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.language-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

/* Language Colors */
.lang-python { background-color: #3776ab; }
.lang-javascript { background-color: #f7df1e; }
.lang-go { background-color: #00add8; }
.lang-shell { background-color: #89e051; }
.lang-html { background-color: #e34c26; }
.lang-css { background-color: #1572b6; }
.lang-powershell { background-color: #5391fe; }
.lang-cpp { background-color: #00599c; }
.lang-c { background-color: #555555; }
.lang-dockerfile { background-color: #2496ed; }

/* Certifications Grid */
.certifications-container {
  display: grid;
  gap: 3rem;
}

.provider-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: 2rem;
}

.provider-title {
  font-size: 1.75rem;
  font-weight: 600;
  margin: 0 0 2rem 0;
  color: var(--text-primary);
  text-align: center;
  position: relative;
}

.provider-title::after {
  content: '';
  position: absolute;
  bottom: -0.5rem;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-500), var(--primary-600));
  border-radius: 2px;
}

.certification-category {
  margin-bottom: 2rem;
}

.category-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 1rem 0;
  color: var(--primary-600);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.category-title::before {
  content: '';
  width: 4px;
  height: 1.5rem;
  background: linear-gradient(180deg, var(--primary-500), var(--primary-600));
  border-radius: 2px;
}

.certification-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1.5rem;
}

.certification-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  text-align: center;
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.certification-card:hover {
  border-color: var(--primary-500);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.cert-image {
  width: 120px !important;
  height: 90px !important;
  min-width: 120px !important;
  min-height: 90px !important;
  max-width: 120px !important;
  max-height: 90px !important;
  object-fit: contain !important;
  object-position: center !important;
  margin-bottom: 1rem;
  border-radius: var(--radius-md);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  background: rgba(var(--text-rgb), 0.05);
  padding: 0.5rem;
  display: block !important;
  box-sizing: border-box !important;
}

.cert-image:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
}

/* Backup rule for any images in certification cards */
.certification-card img,
.certification-box img {
  width: 120px !important;
  height: 90px !important;
  min-width: 120px !important;
  min-height: 90px !important;
  max-width: 120px !important;
  max-height: 90px !important;
  object-fit: contain !important;
  object-position: center !important;
  display: block !important;
  box-sizing: border-box !important;
}

/* Force sizing for GitHub-hosted images */
.certifications-container img[src*="github.com"],
.certifications-container img[src*="githubusercontent.com"],
.certifications-container img[src*="user-attachments"] {
  width: 120px !important;
  height: 90px !important;
  min-width: 120px !important;
  min-height: 90px !important;
  max-width: 120px !important;
  max-height: 90px !important;
  object-fit: contain !important;
  object-position: center !important;
  display: block !important;
  box-sizing: border-box !important;
  border-radius: var(--radius-md) !important;
  background: rgba(var(--text-rgb), 0.05) !important;
  padding: 0.5rem !important;
}

/* Universal rule for ALL images in certifications section */
.certifications-container img,
#certifications img,
section.certifications img {
  width: 120px !important;
  height: 90px !important;
  min-width: 120px !important;
  min-height: 90px !important;
  max-width: 120px !important;
  max-height: 90px !important;
  object-fit: contain !important;
  object-position: center !important;
  display: block !important;
  box-sizing: border-box !important;
}

/* Legacy support for certification-box class */
.certification-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 1.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  text-decoration: none;
  color: inherit;
}

.certification-box:hover {
  border-color: var(--primary-500);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.cert-title {
  font-size: 0.875rem;
  font-weight: 500;
  margin: 0;
  color: var(--text-primary);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Social Grid */
.social-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  max-width: 800px;
  margin: 0 auto 4rem auto;
}

.social-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  text-align: center;
  text-decoration: none;
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.social-card:hover {
  border-color: var(--primary-500);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.social-icon {
  width: 48px;
  height: 48px;
  object-fit: contain;
  border-radius: var(--radius-md);
}

.social-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0;
  color: var(--text-primary);
}

.social-description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0;
}

/* Contact Form */
.contact-form-section {
  max-width: 600px;
  margin: 0 auto;
}

.form-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 2rem 0;
  color: var(--text-primary);
  text-align: center;
}

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

.form-group {
  display: flex;
  flex-direction: column;
}

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

.form-input,
.form-textarea {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary-500);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-error {
  color: #ef4444;
  font-size: 0.875rem;
  margin-top: 0.25rem;
  min-height: 1.25rem;
}

.btn-loading {
  display: none;
}

.btn:disabled .btn-text {
  display: none;
}

.btn:disabled .btn-loading {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.spinner {
  animation: spin 1s linear infinite;
}

/* Footer */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-primary);
  padding: 2rem 0;
  margin-top: 4rem;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-text {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--primary-500);
}

/* Scroll to Top */
.scroll-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  background: var(--primary-600);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
  transform: translateY(100px);
  opacity: 0;
  z-index: 1000;
}

.scroll-to-top.visible {
  transform: translateY(0);
  opacity: 1;
}

.scroll-to-top:hover {
  background: var(--primary-700);
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

/* Loading Placeholders */
.loading-placeholder {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.placeholder-card,
.placeholder-cert,
.placeholder-social {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  animation: skeleton-loading 1.5s ease-in-out infinite alternate;
}

.placeholder-card {
  height: 200px;
}

.placeholder-cert {
  height: 180px;
}

.placeholder-social {
  height: 150px;
}

@keyframes skeleton-loading {
  0% {
    background-color: var(--bg-secondary);
  }
  100% {
    background-color: var(--bg-tertiary);
  }
}

/* Responsive Design */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 3rem;
  }
  
  .hero-title {
    font-size: 3rem;
  }
  
  .about-content {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .about-stats {
    flex-direction: row;
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: flex;
  }
  
  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-top: none;
    padding: 1rem 1.5rem;
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
  }
  
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-link {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-primary);
  }
  
  .nav-link:last-child {
    border-bottom: none;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.25rem;
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .avatar {
    width: 240px;
    height: 240px;
  }
  
  .section {
    padding: 3rem 0;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .about-stats {
    flex-direction: column;
  }
  
  .certification-grid {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }
  
  .cert-image {
    width: 100px !important;
    height: 75px !important;
    min-width: 100px !important;
    min-height: 75px !important;
    max-width: 100px !important;
    max-height: 75px !important;
    object-fit: contain !important;
    object-position: center !important;
    box-sizing: border-box !important;
  }
  
  /* Mobile backup rule for any images in certification cards */
  .certification-card img,
  .certification-box img {
    width: 100px !important;
    height: 75px !important;
    min-width: 100px !important;
    min-height: 75px !important;
    max-width: 100px !important;
    max-height: 75px !important;
  }
  
  /* Force sizing for GitHub-hosted images on mobile */
  .certifications-container img[src*="github.com"],
  .certifications-container img[src*="githubusercontent.com"],
  .certifications-container img[src*="user-attachments"] {
    width: 100px !important;
    height: 75px !important;
    min-width: 100px !important;
    min-height: 75px !important;
    max-width: 100px !important;
    max-height: 75px !important;
  }
  
  /* Universal mobile rule for ALL images in certifications section */
  .certifications-container img,
  #certifications img,
  section.certifications img {
    width: 100px !important;
    height: 75px !important;
    min-width: 100px !important;
    min-height: 75px !important;
    max-width: 100px !important;
    max-height: 75px !important;
  }
  
  .social-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
  
  .scroll-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 44px;
    height: 44px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1.125rem;
  }
  
  .hero-description {
    font-size: 1rem;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
  
  .about-text {
    font-size: 1rem;
  }
  
  .lead {
    font-size: 1.125rem;
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .certification-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
}

/* Animation Classes */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition-slow);
}

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

.scale-in {
  opacity: 0;
  transform: scale(0.9);
  transition: all var(--transition-slow);
}

.scale-in.visible {
  opacity: 1;
  transform: scale(1);
}

.slide-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: all var(--transition-slow);
}

.slide-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.slide-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: all var(--transition-slow);
}

.slide-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Focus Styles for Accessibility */
*:focus {
  outline: 2px solid var(--primary-500);
  outline-offset: 2px;
}

button:focus,
a:focus {
  outline-offset: 4px;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .scroll-indicator {
    display: none;
  }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  :root {
    --border-primary: var(--gray-400);
    --border-secondary: var(--gray-500);
  }
  
  .btn-outline {
    border-width: 2px;
  }
  
  .form-input:focus,
  .form-textarea:focus {
    border-width: 2px;
  }
}

/* Print Styles */
@media print {
  .header,
  .scroll-to-top,
  .theme-toggle,
  .mobile-menu-btn,
  .hero-actions,
  .contact-form-section {
    display: none !important;
  }
  
  .hero {
    min-height: auto;
    padding: 2rem 0;
  }
  
  .section {
    padding: 2rem 0;
    page-break-inside: avoid;
  }
  
  .project-card,
  .certification-card,
  .social-card {
    break-inside: avoid;
  }
}