/* ============================================
   CSS Custom Properties & Design Tokens
   ============================================ */
:root {
  /* Colors - Dark Theme */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #12121a;
  --color-bg-tertiary: #1a1a26;
  --color-surface: rgba(255, 255, 255, 0.03);
  --color-surface-hover: rgba(255, 255, 255, 0.06);

  --color-text-primary: #ffffff;
  --color-text-secondary: #a0a0b0;
  --color-text-tertiary: #6a6a7a;

  --color-accent-primary: #6366f1;
  --color-accent-secondary: #8b5cf6;
  --color-accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);

  /* Typography */
  --font-primary:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
    Cantarell, sans-serif;
  --font-mono:
    "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;

  --font-size-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --font-size-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
  --font-size-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --font-size-lg: clamp(1.125rem, 1rem + 0.625vw, 1.5rem);
  --font-size-xl: clamp(1.5rem, 1.25rem + 1.25vw, 2.25rem);
  --font-size-2xl: clamp(2rem, 1.5rem + 2.5vw, 3.5rem);
  --font-size-3xl: clamp(2.5rem, 2rem + 2.5vw, 4.5rem);

  /* Spacing */
  --space-xs: clamp(0.5rem, 0.45rem + 0.25vw, 0.75rem);
  --space-sm: clamp(1rem, 0.9rem + 0.5vw, 1.5rem);
  --space-md: clamp(1.5rem, 1.3rem + 1vw, 2.5rem);
  --space-lg: clamp(2rem, 1.5rem + 2.5vw, 4rem);
  --space-xl: clamp(3rem, 2rem + 5vw, 6rem);
  --space-2xl: clamp(4rem, 3rem + 5vw, 8rem);

  /* Layout */
  --container-max-width: 1400px;
  --container-padding: clamp(1.5rem, 5vw, 3rem);

  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.6s cubic-bezier(0.16, 1, 0.3, 1);

  /* Effects */
  --blur-sm: 8px;
  --blur-md: 16px;
  --blur-lg: 24px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 32px rgba(99, 102, 241, 0.3);

  /* Z-index layers */
  --z-canvas: 1;
  --z-content: 10;
  --z-nav: 100;
  --z-cursor: 1000;
  --z-loader: 10000;
}

/* ============================================
   Reset & Base Styles
   ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  overflow-x: hidden;
  min-height: 100vh;
}

/* ============================================
   WebGL Canvas
   ============================================ */
.webgl-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: var(--z-canvas);
  pointer-events: none;
}

/* ============================================
   Loader
   ============================================ */
.loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-loader);
  transition:
    opacity var(--transition-slow),
    visibility var(--transition-slow);
}

.loader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader__content {
  text-align: center;
}

.loader__spinner {
  width: 60px;
  height: 60px;
  margin: 0 auto var(--space-sm);
  border: 3px solid var(--color-surface);
  border-top-color: var(--color-accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.loader__text {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-sm);
}

.loader__progress {
  width: 200px;
  height: 2px;
  background: var(--color-surface);
  border-radius: 2px;
  overflow: hidden;
  margin: 0 auto;
}

.loader__progress-bar {
  height: 100%;
  background: var(--color-accent-gradient);
  width: 0%;
  transition: width 0.3s ease;
}

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: var(--space-sm) var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: var(--z-nav);
  transition:
    background-color var(--transition-base),
    backdrop-filter var(--transition-base);
}

.nav.scrolled {
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(var(--blur-md));
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.05);
}

.nav__logo-text {
  font-size: var(--font-size-lg);
  font-weight: 700;
  background: var(--color-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav__menu {
  display: flex;
  gap: var(--space-md);
  list-style: none;
}

.nav__link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: 500;
  position: relative;
  transition: color var(--transition-fast);
}

.nav__link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent-gradient);
  transition: width var(--transition-base);
}

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

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav__toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  transition:
    transform var(--transition-base),
    opacity var(--transition-base);
}

@media (max-width: 768px) {
  .nav__menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: rgba(18, 18, 26, 0.98);
    backdrop-filter: blur(var(--blur-lg));
    flex-direction: column;
    padding: var(--space-2xl) var(--space-lg);
    transition: right var(--transition-smooth);
  }

  .nav__menu.active {
    right: 0;
  }

  .nav__toggle {
    display: flex;
  }

  .nav__toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
  }

  .nav__toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav__toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
  }
}

/* ============================================
   Main Layout
   ============================================ */
.main {
  position: relative;
  z-index: var(--z-content);
}

.section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--space-2xl) 0;
  position: relative;
}

.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section__title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin-bottom: var(--space-xl);
  text-align: center;
  background: var(--color-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  justify-content: center;
  text-align: center;
}

.hero__content {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.hero__title {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--space-md);
}

.hero__title-line {
  display: block;
  opacity: 0;
  transform: translateY(40px);
  animation: fadeInUp var(--transition-smooth) forwards;
}

.hero__title-line:nth-child(2) {
  background: var(--color-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation-delay: 0.1s;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  opacity: 0;
  animation: fadeInUp var(--transition-smooth) 0.3s forwards;
}

.hero__cta {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeInUp var(--transition-smooth) 0.5s forwards;
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-text-tertiary);
  font-size: var(--font-size-xs);
  opacity: 0;
  animation: fadeIn var(--transition-slow) 1s forwards;
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}

.hero__scroll-indicator {
  width: 2px;
  height: 40px;
  background: linear-gradient(
    to bottom,
    var(--color-accent-primary),
    transparent
  );
  animation: scrollIndicator 2s ease-in-out infinite;
}

@keyframes scrollIndicator {
  0%,
  100% {
    transform: translateY(0);
    opacity: 1;
  }
  50% {
    transform: translateY(10px);
    opacity: 0.5;
  }
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-decoration: none;
  border-radius: 8px;
  transition: all var(--transition-base);
  cursor: pointer;
  border: none;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  transform: translate(-50%, -50%);
  transition:
    width var(--transition-smooth),
    height var(--transition-smooth);
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn--primary {
  background: var(--color-accent-gradient);
  color: white;
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(99, 102, 241, 0.4);
}

.btn--secondary {
  background: var(--color-surface);
  color: var(--color-text-primary);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn--secondary:hover {
  background: var(--color-surface-hover);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn--full {
  width: 100%;
}

/* ============================================
   About Section
   ============================================ */
.about__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.about__paragraph {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.8;
}

.about__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.stat {
  text-align: center;
  padding: var(--space-md);
  background: var(--color-surface);
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: all var(--transition-base);
}

.stat:hover {
  background: var(--color-surface-hover);
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-4px);
}

.stat__number {
  display: block;
  font-size: var(--font-size-2xl);
  font-weight: 700;
  background: var(--color-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-xs);
}

.stat__label {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

@media (max-width: 968px) {
  .about__content {
    grid-template-columns: 1fr;
  }

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

/* ============================================
   Skills Section
   ============================================ */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.skill-card {
  padding: var(--space-lg);
  background: var(--color-surface);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 16px;
  transition: all var(--transition-base);
}

.skill-card:hover {
  background: var(--color-surface-hover);
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.skill-card__icon {
  font-size: 3rem;
  margin-bottom: var(--space-sm);
}

.skill-card__title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.skill-card__list {
  list-style: none;
}

.skill-card__list li {
  padding: var(--space-xs) 0;
  color: var(--color-text-secondary);
  position: relative;
  padding-left: var(--space-sm);
}

.skill-card__list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--color-accent-primary);
}

/* ============================================
   Projects Section
   ============================================ */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.project-card {
  background: var(--color-surface);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 16px;
  overflow: hidden;
  transition: all var(--transition-base);
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(99, 102, 241, 0.3);
}

.project-card__image {
  width: 100%;
  height: 240px;
  overflow: hidden;
  position: relative;
}

.project-card__placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    rgba(99, 102, 241, 0.2),
    rgba(139, 92, 246, 0.2)
  );
  transition: transform var(--transition-slow);
}

.project-card:hover .project-card__placeholder {
  transform: scale(1.1);
}

.project-card__content {
  padding: var(--space-lg);
}

.project-card__title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.project-card__description {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.6;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.tag {
  padding: 0.375rem 0.75rem;
  background: rgba(99, 102, 241, 0.1);
  color: var(--color-accent-primary);
  border-radius: 6px;
  font-size: var(--font-size-xs);
  font-weight: 500;
}

.project-card__link {
  color: var(--color-accent-primary);
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: gap var(--transition-base);
}

.project-card__link:hover {
  gap: 0.75rem;
}

/* ============================================
   Contact Section
   ============================================ */
.contact__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  max-width: 1000px;
  margin: 0 auto;
}

.contact__description {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  line-height: 1.8;
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.contact__link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: 8px;
  transition: all var(--transition-base);
}

.contact__link:hover {
  color: var(--color-text-primary);
  background: var(--color-surface);
  transform: translateX(8px);
}

.contact__icon {
  font-size: 1.5rem;
}

/* Form Styles */
.contact__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.form-group {
  position: relative;
}

.form-input {
  width: 100%;
  padding: 1rem;
  background: var(--color-surface);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
  font-family: var(--font-primary);
  transition: all var(--transition-base);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  background: var(--color-surface-hover);
}

.form-input:focus + .form-label,
.form-input:not(:placeholder-shown) + .form-label {
  transform: translateY(-2rem) scale(0.85);
  color: var(--color-accent-primary);
}

.form-label {
  position: absolute;
  left: 1rem;
  top: 1rem;
  color: var(--color-text-tertiary);
  pointer-events: none;
  transition: all var(--transition-base);
  transform-origin: left;
}

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

@media (max-width: 968px) {
  .contact__content {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   Footer
   ============================================ */
.footer {
  padding: var(--space-lg) 0;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer__text {
  color: var(--color-text-tertiary);
  font-size: var(--font-size-sm);
}

/* ============================================
   Custom Cursor
   ============================================ */
.cursor,
.cursor-follower {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: var(--z-cursor);
  mix-blend-mode: difference;
}

.cursor {
  width: 8px;
  height: 8px;
  background: white;
  transform: translate(-50%, -50%);
}

.cursor-follower {
  width: 32px;
  height: 32px;
  border: 2px solid rgba(255, 255, 255, 0.5);
  transform: translate(-50%, -50%);
  transition:
    width 0.3s,
    height 0.3s,
    border-color 0.3s;
}

.cursor-follower.hover {
  width: 48px;
  height: 48px;
  border-color: rgba(99, 102, 241, 0.8);
}

@media (hover: none) {
  .cursor,
  .cursor-follower {
    display: none;
  }
}

/* ============================================
   Animation Utilities
   ============================================ */
[data-animate] {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity var(--transition-smooth),
    transform var(--transition-smooth);
}

[data-animate].animated {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   Accessibility
   ============================================ */
.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;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus visible for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--color-accent-primary);
  outline-offset: 4px;
}