/* 
  Minimalist Black & White Design System
  Developer: Gohar Rehman (Backend Software Engineer)
*/

/* --- Google Font Import --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@300;400;500;600;700&display=swap');

/* --- Reset & Base Variables --- */
:root {
  /* Colors */
  --bg-color: #000000;
  --text-primary: #ffffff;
  --text-secondary: #b0b0b0;
  --border-color: #222222;
  --border-hover: #ffffff;
  --accent: #ffffff;
  --navbar-bg: rgba(0, 0, 0, 0.85);
  --icon-filter: brightness(0) invert(0.69);
  --icon-filter-hover: brightness(0) invert(1);
  
  /* Fonts */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Spacing Scale */
  --space-8: 8px;
  --space-12: 12px;
  --space-16: 16px;
  --space-24: 24px;
  --space-32: 32px;
  --space-48: 48px;
  --space-64: 64px;
  --space-96: 96px;

  /* Max Widths */
  --max-width: 1200px;
  --header-height: 80px;
  --header-shrink-height: 60px;

  /* Transitions */
  --transition-fast: 200ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 400ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 800ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* Light Theme Variables Override */
:root.light-theme {
  --bg-color: #ffffff;
  --text-primary: #000000;
  --text-secondary: #555555;
  --border-color: #e0e0e0;
  --border-hover: #000000;
  --accent: #000000;
  --navbar-bg: rgba(255, 255, 255, 0.85);
  --icon-filter: brightness(0) invert(0.3);
  --icon-filter-hover: brightness(0) invert(0);
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-primary);
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-color);
}
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* --- Layout & Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

p {
  color: var(--text-secondary);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

button, input, textarea {
  font-family: inherit;
  font-size: inherit;
  background: none;
  border: none;
  color: inherit;
  outline: none;
}

/* Scroll Progress Bar */
.scroll-progress-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: transparent;
  z-index: 1001;
}

.scroll-progress-bar {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width 50ms linear;
}

/* --- Sticky Navbar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  border-bottom: 1px solid var(--border-color);
  background: var(--navbar-bg);
  backdrop-filter: blur(8px);
  z-index: 1000;
  transition: height var(--transition-normal), border-color var(--transition-normal);
}

.navbar.shrink {
  height: var(--header-shrink-height);
}

.navbar-container {
  max-width: var(--max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--space-24);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-primary);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.1em;
  display: flex;
  align-items: center;
  gap: var(--space-8);
  white-space: nowrap;
}

.logo-slash {
  font-family: var(--font-mono);
  color: var(--text-secondary);
  font-weight: 300;
}

.nav-links {
  display: flex;
  gap: var(--space-32);
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: var(--space-8) 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-normal);
}

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

.nav-link.active::after,
.nav-link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Navbar Actions Container */
.navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-24);
}

/* Theme Toggle Button */
.theme-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.theme-toggle-btn:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.theme-toggle-btn svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
}

/* Icons state based on theme */
.sun-icon {
  display: block;
}
.moon-icon {
  display: none;
}

.light-theme .sun-icon {
  display: none;
}
.light-theme .moon-icon {
  display: block;
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  cursor: pointer;
  flex-direction: column;
  justify-content: space-between;
  width: 20px;
  height: 14px;
}

.mobile-nav-toggle span {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--text-primary);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

/* Mobile Nav Menu */
.mobile-nav-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 100%;
  height: 100vh;
  background: var(--bg-color);
  z-index: 999;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--space-32);
  transition: right var(--transition-normal);
  border-left: 1px solid var(--border-color);
}

.mobile-nav-menu.open {
  right: 0;
}

.mobile-nav-link {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-secondary);
}

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

/* --- Layout Sections --- */
section {
  padding: var(--space-96) 0;
  border-bottom: 1px solid var(--border-color);
}

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

.section-header {
  margin-bottom: var(--space-64);
  max-width: 600px;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--text-secondary);
  display: block;
  margin-bottom: var(--space-16);
}

.section-title {
  font-size: 2.25rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: -0.01em;
}

/* --- Hero Section --- */
.hero {
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--header-height);
  border-bottom: 1px solid var(--border-color);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
  gap: var(--space-48);
  width: 100%;
}

.hero-content {
  display: flex;
  flex-direction: column;
}

.hero-tagline {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.15em;
  color: var(--text-secondary);
  margin-bottom: var(--space-24);
  text-transform: uppercase;
}

.hero-name {
  font-size: clamp(3rem, 6vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 0.9;
  text-transform: uppercase;
  margin-bottom: var(--space-16);
}

.hero-title {
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: var(--space-16);
  border-right: 2px solid var(--accent);
  white-space: nowrap;
  width: max-content;
  padding-right: 4px;
}

.hero-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 540px;
  margin-bottom: var(--space-32);
}

.hero-stack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-16);
  margin-bottom: var(--space-48);
}

.hero-stack-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border-color);
  background: var(--bg-color);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
  cursor: pointer;
}

.hero-stack-icon img,
.hero-stack-icon svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
  filter: var(--icon-filter);
  color: var(--text-secondary);
  transition: color var(--transition-fast), filter var(--transition-fast);
}

.hero-stack-icon:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.hero-stack-icon:hover img,
.hero-stack-icon:hover svg {
  filter: var(--icon-filter-hover);
  color: var(--text-primary);
}

.hero-actions {
  display: flex;
  gap: var(--space-16);
  flex-wrap: wrap;
}

/* Floating Geometric Elements (Pure CSS B&W Art) */
.hero-shapes {
  position: relative;
  width: 100%;
  height: 380px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.shape {
  position: absolute;
  border: 1px solid var(--border-color);
  transition: border-color var(--transition-slow);
}

.shape-1 {
  width: 240px;
  height: 240px;
  border-radius: 50%;
  animation: floatRound 20s infinite linear;
}

.shape-2 {
  width: 180px;
  height: 180px;
  animation: floatRotate 25s infinite linear reverse;
}

.shape-3 {
  width: 120px;
  height: 120px;
  border-style: dashed;
  border-radius: 8px;
  animation: floatRotate 15s infinite linear;
}

@keyframes floatRotate {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

@keyframes floatRound {
  0% {
    transform: rotate(0deg) translate(15px) rotate(0deg);
  }
  100% {
    transform: rotate(360deg) translate(15px) rotate(-360deg);
  }
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-16) var(--space-32);
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  cursor: pointer;
}

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

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

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

.btn-secondary:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

/* --- About Section --- */
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-64);
}

.about-text {
  display: flex;
  flex-direction: column;
  gap: var(--space-24);
}

.about-intro {
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--text-primary);
  line-height: 1.5;
}

.about-body {
  font-size: 1rem;
  color: var(--text-secondary);
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-32);
  align-content: center;
}

.stat-item {
  border: 1px solid var(--border-color);
  padding: var(--space-32);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  transition: border-color var(--transition-fast);
}

.stat-item:hover {
  border-color: var(--border-hover);
}

.stat-number {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: var(--space-8);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* --- Skills Section --- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-32);
}

.skill-category-card {
  border: 1px solid var(--border-color);
  padding: var(--space-32);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

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

.skill-category-name {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  text-transform: uppercase;
  color: var(--text-primary);
  letter-spacing: 0.1em;
  margin-bottom: var(--space-24);
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--border-color);
}

.skill-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
}

.skill-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.skill-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.875rem;
}

.skill-name {
  color: var(--text-secondary);
}

.skill-level {
  font-family: var(--font-mono);
  color: var(--text-primary);
}

.skill-progress-bg {
  width: 100%;
  height: 2px;
  background-color: var(--border-color);
  overflow: hidden;
}

.skill-progress-bar {
  width: 0%; /* Animate this in JS */
  height: 100%;
  background-color: var(--accent);
  transition: width var(--transition-slow);
}

/* --- Experience Section --- */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-16) 0;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 20px;
  width: 1px;
  height: 100%;
  background: var(--border-color);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--space-48);
  padding-left: 50px;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: 17px;
  top: 8px;
  width: 7px;
  height: 7px;
  background: var(--bg-color);
  border: 1px solid var(--accent);
  border-radius: 50%;
  z-index: 1;
  transition: background var(--transition-fast);
}

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

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-8);
  flex-wrap: wrap;
  gap: var(--space-8);
}

.timeline-role {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.timeline-company {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-16);
  display: block;
}

.timeline-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-16);
}

.timeline-details {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.timeline-detail-item {
  font-size: 0.875rem;
  color: var(--text-secondary);
  position: relative;
  padding-left: var(--space-16);
}

.timeline-detail-item::before {
  content: '-';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--text-secondary);
}

/* --- Featured Projects --- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-32);
}

.project-card {
  border: 1px solid var(--border-color);
  background: var(--bg-color);
  padding: var(--space-32);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 340px;
  position: relative;
  transition: transform var(--transition-normal);
}

.project-card:hover {
  transform: translateY(-6px);
}

/* Custom border animation logic using pure CSS transitions on outline or custom divs */
.project-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 1px solid var(--accent);
  opacity: 0;
  transition: opacity var(--transition-normal);
  pointer-events: none;
}

.project-card:hover::after {
  opacity: 1;
}

.project-title {
  font-size: 1.25rem;
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: var(--space-12);
  color: var(--text-primary);
}

.project-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-24);
  line-height: 1.5;
}

.project-stack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-8);
  margin-bottom: var(--space-32);
}

.project-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 4px 8px;
}

.project-links {
  display: flex;
  gap: var(--space-16);
}

.project-link-btn {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
  padding: var(--space-8) 0;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.project-link-btn:hover {
  color: var(--text-primary);
  border-color: var(--text-primary);
}

.project-link-btn svg,
.project-link-btn img {
  width: 12px;
  height: 12px;
  filter: brightness(0) invert(0.69);
  transition: filter var(--transition-fast);
}

.project-link-btn:hover svg,
.project-link-btn:hover img {
  filter: brightness(0) invert(1);
}

/* --- Technology Showcase (Interactive Grid) --- */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: var(--space-16);
}

.showcase-item {
  border: 1px solid var(--border-color);
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--space-12);
  cursor: pointer;
  position: relative;
  transition: border-color var(--transition-normal), transform var(--transition-normal);
}

.showcase-item img,
.showcase-item svg {
  width: 32px;
  height: 32px;
  fill: currentColor;
  filter: var(--icon-filter);
  color: var(--text-secondary);
  transition: color var(--transition-normal), filter var(--transition-normal);
}

.showcase-name {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  transition: color var(--transition-normal);
}

.showcase-item:hover {
  border-color: var(--border-hover);
  transform: scale(1.05);
  z-index: 2;
}

.showcase-item:hover img,
.showcase-item:hover svg {
  filter: var(--icon-filter-hover);
  color: var(--text-primary);
}

.showcase-item:hover .showcase-name {
  color: var(--text-primary);
}

/* Showcase Tooltip */
.showcase-tooltip {
  position: absolute;
  bottom: -35px;
  left: 50%;
  transform: translateX(-50%) translateY(5px);
  background: var(--text-primary);
  color: var(--bg-color);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  padding: 4px 8px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: 10;
}

.showcase-item:hover .showcase-tooltip {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* --- Education Section --- */
.education-timeline {
  display: flex;
  flex-direction: column;
  gap: var(--space-32);
  max-width: 800px;
  margin: 0 auto;
}

.education-card {
  border: 1px solid var(--border-color);
  padding: var(--space-32);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  transition: border-color var(--transition-fast);
}

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

.education-main {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.education-school {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.education-degree {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.education-meta {
  text-align: right;
}

.education-year {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}

/* --- Contact Section --- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: var(--space-64);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-32);
}

.contact-detail-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-24);
}

.contact-detail-item {
  display: flex;
  align-items: center;
  gap: var(--space-16);
}

.contact-icon-box {
  width: 48px;
  height: 48px;
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-icon-box svg,
.contact-icon-box img {
  width: 18px;
  height: 18px;
  filter: var(--icon-filter);
}

.contact-detail-title {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  text-transform: uppercase;
}

.contact-detail-value {
  font-size: 0.95rem;
  color: var(--text-primary);
}

/* Contact Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-24);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.form-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.form-input,
.form-textarea {
  width: 100%;
  border: 1px solid var(--border-color);
  background: var(--bg-color);
  color: var(--text-primary);
  padding: var(--space-16);
  font-size: 0.875rem;
  transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--text-primary);
}

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

.form-error {
  font-size: 0.75rem;
  color: var(--text-primary);
  margin-top: 4px;
  font-family: var(--font-mono);
  display: none;
}

.form-error.active {
  display: block;
}

.form-submit-btn {
  align-self: flex-start;
}

.form-message-status {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  display: none;
  border: 1px solid var(--border-color);
  padding: var(--space-16);
  text-transform: uppercase;
}

.form-message-status.success {
  display: block;
  border-color: var(--text-primary);
  color: var(--text-primary);
}

.form-message-status.error {
  display: block;
  border-color: var(--border-color);
  color: var(--text-secondary);
}

/* --- Footer --- */
.footer {
  padding: var(--space-64) 0;
  background-color: var(--bg-color);
}

.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-24);
}

.footer-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.footer-name {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.footer-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.footer-links {
  display: flex;
  gap: var(--space-24);
}

.footer-link-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border-color);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.footer-link-icon:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.footer-link-icon img,
.footer-link-icon svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
  filter: var(--icon-filter);
  color: var(--text-secondary);
  transition: color var(--transition-fast), filter var(--transition-fast);
}

.footer-link-icon:hover img,
.footer-link-icon:hover svg {
  filter: var(--icon-filter-hover);
  color: var(--text-primary);
}

.footer-copy {
  width: 100%;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-color);
  padding-top: var(--space-24);
  margin-top: var(--space-24);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-12);
}

/* --- Animation Classes (Scroll-Triggered) --- */
.animate-on-scroll {
  opacity: 0;
  transition-property: opacity, transform;
  transition-timing-function: cubic-bezier(0.16, 1, 0.3, 1);
  will-change: transform, opacity;
}

.animate-fade-in {
  transition-duration: 600ms;
}
.animate-fade-in.animated {
  opacity: 1;
}

.animate-fade-up {
  transform: translateY(30px);
  transition-duration: 800ms;
}
.animate-fade-up.animated {
  opacity: 1;
  transform: translateY(0);
}

.animate-slide-left {
  transform: translateX(40px);
  transition-duration: 800ms;
}
.animate-slide-left.animated {
  opacity: 1;
  transform: translateX(0);
}

.animate-slide-right {
  transform: translateX(-40px);
  transition-duration: 800ms;
}
.animate-slide-right.animated {
  opacity: 1;
  transform: translateX(0);
}

.animate-scale-in {
  transform: scale(0.95);
  transition-duration: 600ms;
}
.animate-scale-in.animated {
  opacity: 1;
  transform: scale(1);
}

/* Delay modifiers */
.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-300 { transition-delay: 300ms; }
.delay-400 { transition-delay: 400ms; }
.delay-500 { transition-delay: 500ms; }
.delay-600 { transition-delay: 600ms; }

/* Loading Animation Overlay */
.loader-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-color);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  transition: opacity 500ms ease, visibility 500ms ease;
}

.loader-overlay.fade-out {
  opacity: 0;
  visibility: hidden;
}

.loader-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-16);
}

.loader-bar {
  width: 150px;
  height: 1px;
  background-color: var(--border-color);
  position: relative;
  overflow: hidden;
}

.loader-bar-fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 0%;
  background-color: var(--text-primary);
  animation: loadProgress 1.5s infinite ease-in-out;
}

@keyframes loadProgress {
  0% {
    left: -100%;
    width: 100%;
  }
  50% {
    left: 0%;
    width: 10%;
  }
  100% {
    left: 100%;
    width: 100%;
  }
}

.loader-text {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--text-secondary);
  text-transform: uppercase;
}

/* --- Responsive Adjustments --- */
@media (max-width: 992px) {
  .hero {
    height: auto;
    min-height: 100vh;
    padding-top: calc(var(--header-height) + var(--space-48));
    padding-bottom: var(--space-64);
    position: relative;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: var(--space-64);
    text-align: center;
    padding-top: var(--space-48);
  }

  .hero-content {
    align-items: center;
    position: relative;
    z-index: 2;
  }

  .hero-shapes {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    max-width: 400px;
    height: 380px;
    z-index: 1;
    opacity: 0.15;
    pointer-events: none;
  }

  .hero-title {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-stack {
    justify-content: center;
  }

  .hero-actions {
    justify-content: center;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--space-48);
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--space-48);
  }

  .desktop-nav {
    display: none;
  }

  .navbar-actions {
    gap: var(--space-16);
  }

  .theme-toggle-btn {
    margin-right: 6px;
  }

  .mobile-nav-toggle {
    display: flex;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 70px;
    --header-shrink-height: 60px;
  }

  section {
    padding: var(--space-64) 0;
  }

  #contact {
    padding-bottom: var(--space-96);
  }

  .section-title {
    font-size: 1.75rem;
  }

  .timeline::before {
    left: 10px;
  }

  .timeline-item {
    padding-left: var(--space-32);
  }

  .timeline-dot {
    left: 7px;
  }

  .education-card {
    flex-direction: column;
    gap: var(--space-16);
  }

  .education-meta {
    text-align: left;
  }

  .footer-container {
    flex-direction: column;
    text-align: center;
    gap: var(--space-24);
  }

  .footer-copy {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--space-8);
  }
}

@media (max-width: 480px) {
  .navbar-container {
    padding: 0 var(--space-16);
  }

  .navbar-actions {
    gap: var(--space-12);
  }

  .logo {
    font-size: 1.05rem;
    letter-spacing: 0.05em;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    max-width: 280px;
    margin: 0 auto;
    gap: var(--space-12);
  }

  .hero-actions .btn {
    width: 100%;
  }

  .about-stats {
    grid-template-columns: 1fr;
    gap: var(--space-16);
  }

  .stat-item {
    padding: var(--space-24);
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .showcase-grid {
    grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
    gap: var(--space-12);
  }
}