/* ===== DESIGN TOKENS ===== */
:root {
  --color-bg: #000000;
  --color-bg-secondary: #000000;
  --color-surface: #0e0e0e;
  --color-surface-hover: #141414;
  --color-text: #ffffff;
  --color-text-muted: #a0a0a0;
  --color-text-dim: #888888;
  --color-accent: #00E5FF;
  --color-accent-dim: rgba(0, 229, 255, 0.1);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-overlay: rgba(0, 0, 0, 0.8);
  
  /* Glass effect tokens */
  --glass-bg: rgba(14, 14, 14, 0.5);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-blur: 24px;

  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Outfit', 'Inter', sans-serif;

  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1.125rem;
  --fs-lg: 1.125rem;
  --fs-xl: 1.25rem;
  --fs-2xl: 1.5rem;
  --fs-3xl: 2.25rem;
  --fs-4xl: 3rem;
  --fs-hero: clamp(2.5rem, 8vw, 5rem);

  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 5rem;
  --spacing-4xl: 8rem;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --transition-fast: 0.15s ease;
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-glacial: 1s cubic-bezier(0.2, 0.8, 0.2, 1);

  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(255, 255, 255, 0.05);

  --grid-gap: 24px;
  --header-height: 80px;
  --max-width: 1600px;
}

/* ===== RESET & BASE ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  letter-spacing: -0.01em;
}

/* Background Glow Effects */
.bg-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
  background: #000000;
}

.glow-blob {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0;
  background: white;
  animation: float 20s infinite alternate cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
}

.glow-1 {
  top: -10%;
  left: -10%;
  background: #0055ff;
  animation-duration: 25s;
}

.glow-2 {
  bottom: -10%;
  right: -10%;
  background: #aa00ff;
  animation-duration: 30s;
  animation-delay: -5s;
}

.glow-3 {
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 400px;
  height: 400px;
  background: #00E5FF;
  opacity: 0.05;
  animation: pulse 15s infinite alternate;
}

@keyframes float {
  0% { transform: translate(0, 0) rotate(0deg); }
  50% { transform: translate(100px, 50px) rotate(90deg); }
  100% { transform: translate(-50px, 100px) rotate(180deg); }
}

@keyframes pulse {
  0% { transform: translate(-50%, -50%) scale(1); opacity: 0.05; }
  100% { transform: translate(-50%, -50%) scale(1.5); opacity: 0.08; }
}

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

a:hover {
  opacity: 0.7;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

ul, ol {
  list-style: none;
}

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
  color: inherit;
}

/* ===== HEADER ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-xl);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: all var(--transition-base);
}

.site-header.scrolled {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--glass-border);
  height: calc(var(--header-height) - 10px);
}

.header-left a,
.header-right a {
  font-family: var(--font-primary);
  font-size: var(--fs-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

.header-left a:hover,
.header-right a:hover {
  color: var(--color-accent);
  transform: translateY(-1px);
}

.header-center {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.header-center a {
  font-family: var(--font-heading);
  font-size: var(--fs-xl);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 6px;
  white-space: nowrap;
  background: linear-gradient(to right, #fff, #888);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Hamburger Menu (Mobile) */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  z-index: 1100;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Nav Overlay */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--color-bg);
  z-index: 1050;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xl);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.mobile-nav.active {
  opacity: 1;
  visibility: visible;
}

.mobile-nav a {
  font-family: var(--font-heading);
  font-size: var(--fs-4xl);
  text-transform: uppercase;
  letter-spacing: -1px;
  font-weight: 800;
  transition: transform var(--transition-fast);
}

.mobile-nav a:hover {
  transform: scale(1.1);
  color: var(--color-accent);
}

/* ===== MAIN CONTENT ===== */
main {
  padding-top: var(--header-height);
}

/* ===== HERO SECTION ===== */
.hero {
  position: relative;
  padding: var(--spacing-4xl) var(--spacing-xl) var(--spacing-3xl);
  max-width: var(--max-width);
  margin: 0 auto;
  min-height: calc(90vh - var(--header-height));
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero h1 {
  font-family: var(--font-heading);
  font-size: var(--fs-hero);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -1px;
  line-height: 0.9;
  margin-bottom: var(--spacing-xl);
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp var(--transition-slow) forwards;
}

.hero p {
  font-size: var(--fs-xl);
  color: var(--color-text-muted);
  max-width: 800px;
  line-height: 1.5;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp var(--transition-slow) forwards 0.2s;
}

/* ===== PORTFOLIO GRID ===== */
.portfolio-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-xl) var(--spacing-4xl);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--grid-gap);
}

.portfolio-item {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  opacity: 0;
  transform: translateY(40px);
  transition: all var(--transition-slow);
}

.portfolio-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.portfolio-item .image-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 11;
  overflow: hidden;
}

.portfolio-item .image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-glacial);
}

.portfolio-item .image-wrapper .portfolio-img {
  position: absolute;
  top: 0;
  left: 0;
}

.portfolio-item:hover {
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  transform: translateY(-8px);
}

.portfolio-item:hover .image-wrapper img {
  transform: scale(1.08);
}

/* Image overlay on hover */
.portfolio-item .image-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    0deg,
    rgba(0, 0, 0, 0.8) 0%,
    rgba(0, 0, 0, 0) 60%
  );
  opacity: 0.6;
  transition: opacity var(--transition-base);
}

.portfolio-item:hover .image-overlay {
  opacity: 0.9;
}

.portfolio-item .item-title {
  position: absolute;
  bottom: 0;
  left: 0;
  padding: var(--spacing-lg);
  font-family: var(--font-heading);
  font-size: var(--fs-xl);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: #fff;
  z-index: 2;
  transition: transform var(--transition-base);
}

.portfolio-item:hover .item-title {
  transform: translateY(-5px);
}

/* Placeholder image styling */
.placeholder-img {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 40%, #0f3460 100%);
  position: relative;
  overflow: hidden;
}

.placeholder-img::before {
  content: '';
  position: absolute;
  width: 120%;
  height: 120%;
  background: radial-gradient(
    circle at 30% 50%,
    rgba(100, 150, 255, 0.08) 0%,
    transparent 50%
  );
  animation: shimmer 8s ease-in-out infinite alternate;
}

.placeholder-img::after {
  content: '';
  position: absolute;
  width: 60px;
  height: 60px;
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: 50%;
}

.placeholder-img .placeholder-icon {
  font-size: 2.5rem;
  opacity: 0.15;
  z-index: 1;
  user-select: none;
}

/* ===== PROJECT DETAIL PAGE (MODAL) ===== */
.project-modal {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: var(--color-bg);
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.project-modal.active {
  opacity: 1;
  visibility: visible;
}

.modal-header {
  position: sticky;
  top: 0;
  z-index: 110; /* Ensure header is always above nav */
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-xl);
  background: var(--color-bg); /* Solid background to prevent overlap transparency */
  border-bottom: 1px solid var(--color-border);
}

.modal-close {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-2xl);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--color-surface-hover);
  color: var(--color-accent);
  transform: rotate(90deg);
}

.modal-content {
  max-width: 1000px;
  margin: 0 auto;
  padding: var(--spacing-4xl) var(--spacing-xl);
}

.modal-content h2 {
  font-family: var(--font-heading);
  font-size: var(--fs-3xl);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -1px;
  line-height: 1;
  margin-bottom: var(--spacing-md);
}

.modal-category {
  color: var(--color-text-muted);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: var(--spacing-xs);
}

.modal-software {
  color: var(--color-text-dim);
  font-size: var(--fs-sm);
  margin-bottom: var(--spacing-2xl);
}

.modal-description p {
  color: var(--color-text-muted);
  font-size: var(--fs-base);
  line-height: 1.8;
  margin-bottom: var(--spacing-lg);
}

.modal-gallery {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-3xl);
}

.modal-gallery .gallery-image {
  width: 100%;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.modal-gallery .gallery-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--transition-slow);
}

.modal-gallery .gallery-image:hover img {
  transform: scale(1.02);
}

.modal-nav-internal {
  position: sticky;
  top: 78px; /* Increased to account for modal-header height */
  z-index: 100;
  background: var(--color-bg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-2xl);
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-border);
}

.modal-nav-internal a {
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-text-dim);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 6px;
}

.modal-nav-internal .nav-label {
  line-height: 1.3;
}

.modal-nav-internal .nav-prev .nav-label {
  text-align: left;
}

.modal-nav-internal .nav-next .nav-label {
  text-align: right;
}

.modal-nav-internal .nav-arrow {
  display: inline-flex;
  font-size: 1.8em;
  line-height: 0;
  position: relative;
  top: -1px;
  transform: scale(1.5, 0.7); /* Shorter and wider */
  transform-origin: center;
}

.modal-nav-internal a:hover {
  color: var(--color-text);
  transform: translateX(4px);
}

.modal-nav-internal .nav-prev a:hover {
  transform: translateX(-4px);
}

/* ===== ABOUT PAGE ===== */
.about-section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-4xl) var(--spacing-xl);
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s ease forwards;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: var(--spacing-4xl);
  align-items: start;
}

.about-section h1 {
  font-family: var(--font-heading);
  font-size: var(--fs-hero);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 4px;
  margin-bottom: var(--spacing-2xl);
}

.about-section p {
  font-size: var(--fs-lg);
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: var(--spacing-lg);
}

.about-section .skills-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-xl);
}

.about-image img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  filter: grayscale(0.2);
  transition: filter var(--transition-base), transform var(--transition-slow);
}

.about-image img:hover {
  filter: grayscale(0);
  transform: scale(1.02);
}

@media (max-width: 992px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }
  
  .about-image {
    order: -1;
    max-width: 600px;
    margin: 0 auto;
  }
}

.about-section .skill-tag {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  transition: border-color var(--transition-fast), color var(--transition-fast),
    background var(--transition-fast);
}

.about-section .skill-tag:hover {
  border-color: var(--color-text-dim);
  color: var(--color-text);
  background: var(--color-surface-hover);
}

/* ===== FOOTER ===== */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-3xl) var(--spacing-xl);
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--spacing-xl);
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-left .footer-email {
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-weight: 400;
}

.footer-right {
  display: flex;
  gap: var(--spacing-xl);
}

.footer-right a {
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-weight: 400;
  transition: opacity var(--transition-fast);
}

.footer-right a:hover {
  opacity: 0.7;
}

.footer-right a.active-link {
  opacity: 0.5;
}

/* ===== PAGE TRANSITIONS ===== */
.page {
  display: none;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.page.active {
  display: block;
  opacity: 1;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes shimmer {
  0% {
    transform: translate(-10%, -10%) rotate(0deg);
  }
  100% {
    transform: translate(10%, 10%) rotate(5deg);
  }
}

/* Stagger animations for grid items */
.portfolio-item:nth-child(1) { transition-delay: 0.05s; }
.portfolio-item:nth-child(2) { transition-delay: 0.1s; }
.portfolio-item:nth-child(3) { transition-delay: 0.15s; }
.portfolio-item:nth-child(4) { transition-delay: 0.2s; }
.portfolio-item:nth-child(5) { transition-delay: 0.25s; }
.portfolio-item:nth-child(6) { transition-delay: 0.3s; }
.portfolio-item:nth-child(7) { transition-delay: 0.35s; }
.portfolio-item:nth-child(8) { transition-delay: 0.4s; }
.portfolio-item:nth-child(9) { transition-delay: 0.45s; }
.portfolio-item:nth-child(10) { transition-delay: 0.5s; }
.portfolio-item:nth-child(11) { transition-delay: 0.55s; }
.portfolio-item:nth-child(12) { transition-delay: 0.6s; }
.portfolio-item:nth-child(13) { transition-delay: 0.65s; }
.portfolio-item:nth-child(14) { transition-delay: 0.7s; }
.portfolio-item:nth-child(15) { transition-delay: 0.75s; }
.portfolio-item:nth-child(16) { transition-delay: 0.8s; }
.portfolio-item:nth-child(17) { transition-delay: 0.85s; }
.portfolio-item:nth-child(18) { transition-delay: 0.9s; }
.portfolio-item:nth-child(19) { transition-delay: 0.95s; }
.portfolio-item:nth-child(20) { transition-delay: 1.0s; }

/* ===== SCROLL HINT ===== */
.scroll-hint {
  position: absolute;
  bottom: 40px;
  left: var(--spacing-xl);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  color: var(--color-text-dim);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 2px;
  opacity: 0;
  animation: fadeInUp var(--transition-slow) forwards 1s;
}

.mouse {
  width: 20px;
  height: 32px;
  border: 2px solid var(--color-text-dim);
  border-radius: 20px;
  position: relative;
  display: inline-block;
}

.wheel {
  width: 2px;
  height: 6px;
  background: var(--color-accent);
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  animation: scrollWheel 2s infinite;
}

@keyframes scrollWheel {
  0% { transform: translateY(0); opacity: 1; }
  100% { transform: translateY(12px); opacity: 0; }
}

/* ===== RESPONSIVE ===== */
/* ===== RESPONSIVE ===== */
@media (max-width: 992px) {
  .portfolio-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--grid-gap);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 70px;
    --grid-gap: 16px;
    --fs-hero: 3.5rem;
  }

  .header-left,
  .header-right > a {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .mobile-nav {
    display: flex;
  }

  .header-center {
    position: relative;
    left: auto;
    transform: none;
  }

  .header-center a {
    font-size: var(--fs-base);
    letter-spacing: 4px;
    background: none;
    -webkit-text-fill-color: #fff;
    color: #fff;
  }

  .hero {
    padding: var(--spacing-4xl) var(--spacing-xl) var(--spacing-xl);
    min-height: 60vh;
  }

  .hero h1 {
    font-size: var(--fs-4xl);
    line-height: 1;
    letter-spacing: -1px;
  }

  .hero p {
    font-size: var(--fs-lg);
  }

  .scroll-hint {
    display: none;
  }

  .portfolio-grid {
    grid-template-columns: 1fr;
    padding: 0 var(--spacing-xl) var(--spacing-4xl);
  }

  .portfolio-item .item-title {
    font-size: var(--fs-lg);
    padding: var(--spacing-md);
  }

  .portfolio-item .image-overlay {
    opacity: 0.8;
  }

  .modal-content {
    padding-top: var(--spacing-2xl);
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }

  .about-image {
    order: -1;
    max-width: 100%;
  }

  .about-section h1 {
    font-size: var(--fs-3xl);
  }

  .modal-content h2 {
    font-size: var(--fs-2xl);
  }

  .modal-description p {
    font-size: var(--fs-sm);
    line-height: 1.6;
  }
}

@media (max-width: 480px) {
  :root {
    --header-height: 60px;
  }

  .hero h1 {
    font-size: var(--fs-3xl);
    letter-spacing: -1px;
  }

  .portfolio-item .item-title {
    font-size: var(--fs-base);
  }
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-dim);
}

/* ===== SELECTION ===== */
::selection {
  background: rgba(255, 255, 255, 0.15);
  color: var(--color-text);
}