/* ===================================
   CSS Variables & Reset
   =================================== */

:root {
  /* Colors - Light Mode */
  --color-primary: #4169E1;
  --color-primary-dark: #3457b1;
  --color-primary-light: #6b8be8;
  
  --color-bg: #ffffff;
  --color-bg-secondary: #f8f9fa;
  --color-bg-tertiary: #e9ecef;
  
  --color-text: #212529;
  --color-text-secondary: #6c757d;
  --color-text-muted: #adb5bd;
  
  --color-border: #dee2e6;
  --color-border-light: #e9ecef;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;
  
  /* Layout */
  --container-max-width: 1200px;
  --nav-height: 80px;
  
  /* Effects */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

/* Dark Mode */
[data-theme="dark"] {
  --color-bg: #0f1419;
  --color-bg-secondary: #1a1f26;
  --color-bg-tertiary: #252c35;
  
  --color-text: #e7e9ea;
  --color-text-secondary: #8b98a5;
  --color-text-muted: #5c6b77;
  
  --color-border: #2f3336;
  --color-border-light: #38444d;
  
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.5);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-base), color var(--transition-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  color: var(--color-primary-dark);
}

ul {
  list-style: none;
}

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

/* ===================================
   Utilities
   =================================== */

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

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-3xl);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-base);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  cursor: pointer;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-text);
  border: 2px solid var(--color-border);
}

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

.btn-full {
  width: 100%;
}

/* ===================================
   Navigation
   =================================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border-light);
  z-index: 1000;
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.nav.scrolled {
  box-shadow: var(--shadow-md);
}

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

.nav-logo {
  display: flex;
  align-items: center;
}

.nav-logo img {
  height: 40px;
  width: auto;
}

.logo-light {
  display: none;
}

[data-theme="dark"] .logo-dark {
  display: none;
}

[data-theme="dark"] .logo-light {
  display: block;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav-link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--spacing-sm) 0;
  position: relative;
}

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

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

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

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  background-color: var(--color-bg-secondary);
  color: var(--color-text);
}

.icon-sun {
  display: none;
}

[data-theme="dark"] .icon-sun {
  display: block;
}

[data-theme="dark"] .icon-moon {
  display: none;
}

/* Mobile Navigation */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--spacing-sm);
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: all var(--transition-fast);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }
  
  .nav-menu {
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border-light);
    padding: var(--spacing-lg);
    gap: var(--spacing-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base);
  }
  
  .nav-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  
  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  
  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  
  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }
}

/* ===================================
   Hero Section
   =================================== */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: var(--nav-height) var(--spacing-lg) var(--spacing-3xl);
}

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

.hero-content {
  max-width: 700px;
}

.hero-greeting {
  font-size: var(--font-size-lg);
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
  animation: fadeInUp 0.6s ease forwards;
  opacity: 0;
}

.hero-name {
  font-size: var(--font-size-5xl);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--spacing-md);
  animation: fadeInUp 0.6s ease 0.1s forwards;
  opacity: 0;
}

.hero-title {
  font-size: var(--font-size-2xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  min-height: 2.5rem;
  animation: fadeInUp 0.6s ease 0.2s forwards;
  opacity: 0;
}

.typing-text {
  color: var(--color-primary);
  font-weight: 500;
}

.typing-cursor {
  color: var(--color-primary);
  animation: blink 1s infinite;
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

.hero-description {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  max-width: 500px;
  animation: fadeInUp 0.6s ease 0.3s forwards;
  opacity: 0;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  animation: fadeInUp 0.6s ease 0.4s forwards;
  opacity: 0;
}

.scroll-indicator {
  position: absolute;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%);
  color: var(--color-text-muted);
  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); }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 768px) {
  .hero-name {
    font-size: var(--font-size-4xl);
  }
  
  .hero-title {
    font-size: var(--font-size-xl);
  }
}

/* ===================================
   About Section
   =================================== */

.about {
  padding: var(--spacing-4xl) 0;
  background-color: var(--color-bg-secondary);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: start;
}

.about-text {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
}

.about-text p {
  margin-bottom: var(--spacing-lg);
}

.about-intro {
  font-size: var(--font-size-xl);
  color: var(--color-text);
}

.about-intro strong {
  color: var(--color-primary);
}

.about-details {
  background-color: var(--color-bg);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
}

.about-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.about-info li {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.about-info svg {
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 2px;
}

.about-info .label {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--spacing-xs);
}

.about-info .value {
  font-weight: 500;
  color: var(--color-text);
}

.about-info .value a {
  color: var(--color-text);
}

.about-info .value a:hover {
  color: var(--color-primary);
}

@media (max-width: 768px) {
  .about-content {
    grid-template-columns: 1fr;
  }
}

/* ===================================
   Portfolio Section
   =================================== */

.portfolio {
  padding: var(--spacing-4xl) 0;
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-xl);
}

.project-card {
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.project-image {
  aspect-ratio: 16 / 10;
  overflow: hidden;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.project-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--color-bg-tertiary) 0%, var(--color-bg-secondary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
}

.project-content {
  padding: var(--spacing-xl);
}

.project-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.project-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.tag {
  font-size: var(--font-size-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--color-bg);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-light);
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md) var(--spacing-lg);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

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

@media (max-width: 480px) {
  .portfolio-grid {
    grid-template-columns: 1fr;
  }
}

/* ===================================
   Contact Section
   =================================== */

.contact {
  padding: var(--spacing-4xl) 0;
  background-color: var(--color-bg-secondary);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--spacing-3xl);
  align-items: start;
}

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

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.contact-item svg {
  color: var(--color-primary);
  flex-shrink: 0;
}

.contact-label {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--spacing-xs);
}

.contact-value {
  font-weight: 500;
  color: var(--color-text);
}

a.contact-value:hover {
  color: var(--color-primary);
}

/* Contact Map */
.contact-map {
  height: 400px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

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

/* ===================================
   Footer
   =================================== */

.footer {
  padding: var(--spacing-xl) 0;
  border-top: 1px solid var(--color-border-light);
}

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

.footer-copyright {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.footer-links {
  display: flex;
  gap: var(--spacing-md);
}

.footer-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.footer-links a:hover {
  background-color: var(--color-bg-secondary);
  color: var(--color-primary);
}

@media (max-width: 480px) {
  .footer-content {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }
}

/* ===================================
   Animations for scroll reveal
   =================================== */

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

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

/* ===================================
   Gallery Trigger (Project Images)
   =================================== */

.gallery-trigger {
  display: block;
  width: 100%;
  height: 100%;
  padding: 0;
  border: none;
  background: none;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.gallery-trigger img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.gallery-trigger:hover img {
  transform: scale(1.05);
}

.image-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  color: #ffffff;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.gallery-trigger:hover .image-overlay,
.gallery-trigger:focus .image-overlay {
  opacity: 1;
}

.image-overlay span {
  font-size: var(--font-size-sm);
  font-weight: 500;
}

/* ===================================
   Lightbox
   =================================== */

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.lightbox.active {
  opacity: 1;
  visibility: visible;
}

.lightbox-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.95);
}

.lightbox-container {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
}

.lightbox-close {
  position: absolute;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  border-radius: var(--radius-md);
  color: #ffffff;
  cursor: pointer;
  transition: background var(--transition-fast);
  z-index: 10;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.2);
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  border-radius: var(--radius-md);
  color: #ffffff;
  cursor: pointer;
  transition: background var(--transition-fast);
  z-index: 10;
}

.lightbox-nav:hover {
  background: rgba(255, 255, 255, 0.2);
}

.lightbox-prev {
  left: var(--spacing-lg);
}

.lightbox-next {
  right: var(--spacing-lg);
}

.lightbox-content {
  max-width: 90vw;
  max-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-image {
  max-width: 100%;
  max-height: 80vh;
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
}

.lightbox-footer {
  position: absolute;
  bottom: var(--spacing-lg);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  color: #ffffff;
  text-align: center;
  z-index: 10;
}

.lightbox-caption {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.8);
  max-width: 600px;
}

.lightbox-counter {
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.5);
}

@media (max-width: 768px) {
  .lightbox-nav {
    width: 40px;
    height: 40px;
  }
  
  .lightbox-prev {
    left: var(--spacing-sm);
  }
  
  .lightbox-next {
    right: var(--spacing-sm);
  }
  
  .lightbox-container {
    padding: var(--spacing-md);
  }
}