/* ===================================
   CUSTOM THEME - Modern Portfolio Design
   =================================== */

/* ROOT & COLORS */
:root {
  --color-primary: #1a1a1a;
  --color-secondary: #666666;
  --color-bg-light: #fafafa;
  --color-bg-white: #ffffff;
  --color-border: #e0e0e0;

  --accent-cyan: #00D9FF;
  --accent-coral: #FF6B35;
  --accent-green: #00D96F;
  --accent-purple: #B537F2;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Syne', 'Inter', sans-serif;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 4rem;

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
}

/* RESET & DEFAULTS */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--color-primary);
  background-color: var(--color-bg-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* CONTAINER */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
}

/* PAGE WRAPPER */
.page-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.main-content {
  flex: 1;
}

/* ===================================
   HEADER & NAVIGATION
   =================================== */

.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
  background-color: rgba(255, 255, 255, 0.95);
}

.navbar {
  padding: var(--spacing-md) 0;
}

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

.logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--color-primary);
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
  transition: var(--transition);
}

.logo:hover {
  color: var(--accent-cyan);
}

.logo-dot {
  color: var(--accent-coral);
  font-size: 2rem;
  line-height: 1;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
}

.nav-link {
  text-decoration: none;
  color: var(--color-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition);
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-cyan);
  transition: var(--transition);
}

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

@media (max-width: 768px) {
  .nav-links {
    gap: var(--spacing-md);
    font-size: 0.9rem;
  }
}

/* ===================================
   HERO SECTION
   =================================== */

.hero {
  padding: var(--spacing-xl) 0;
  background: linear-gradient(135deg, var(--color-bg-light) 0%, var(--color-bg-white) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 217, 255, 0.1) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -50%;
  left: -50%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(181, 55, 242, 0.1) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

.hero-tagline {
  font-size: clamp(1rem, 3vw, 1.5rem);
  color: var(--color-secondary);
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.8;
}

.hero-accent {
  width: 80px;
  height: 6px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-coral), var(--accent-green), var(--accent-purple));
  border-radius: 3px;
  margin: 0 auto;
  animation: slideIn 0.8s ease-out;
}

@keyframes slideIn {
  from {
    width: 0;
    opacity: 0;
  }
  to {
    width: 80px;
    opacity: 1;
  }
}

/* ===================================
   ABOUT / FOCUS AREAS
   =================================== */

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

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 5vw, 2.5rem);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary);
  text-align: center;
}

.section-subtitle {
  text-align: center;
  color: var(--color-secondary);
  font-size: 1.1rem;
  margin-bottom: var(--spacing-xl);
}

.focus-areas-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.focus-card {
  padding: var(--spacing-lg);
  background: var(--color-bg-light);
  border-radius: 12px;
  border-left: 4px solid var(--accent-color);
  transition: var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.focus-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--accent-color), transparent);
  opacity: 0;
  transition: var(--transition);
  pointer-events: none;
}

.focus-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  background: var(--color-bg-white);
}

.focus-card:hover::before {
  opacity: 0.05;
}

.focus-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.focus-card h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
  font-size: 1.25rem;
}

.focus-card p {
  color: var(--color-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ===================================
   TECH STACK
   =================================== */

.tech-stack {
  padding: var(--spacing-xl) 0;
  background: var(--color-bg-light);
}

.tech-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  justify-content: center;
}

.tech-tag {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: 24px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-primary);
  transition: var(--transition);
  cursor: default;
}

.tech-tag:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  box-shadow: 0 0 12px rgba(0, 217, 255, 0.2);
}

/* ===================================
   PROJECTS SECTION
   =================================== */

.projects {
  padding: var(--spacing-xl) 0;
  background: var(--color-bg-white);
}

.filter-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  margin-top: var(--spacing-lg);
}

.filter-group {
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 0.75rem;
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 0.45rem;
}

.filter-group-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--color-secondary);
  margin: 0;
}

.filter-options {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
  justify-content: flex-start;
  align-content: flex-start;
}

.filter-btn {
  padding: 0.75rem 1.5rem;
  background: var(--color-bg-light);
  border: 2px solid var(--color-border);
  border-radius: 24px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.filter-btn.active {
  background: var(--accent-cyan);
  border-color: var(--accent-cyan);
  color: var(--color-bg-white);
  box-shadow: var(--shadow-md);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--spacing-sm);
}

.project-card {
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: var(--spacing-sm);
  transition: var(--transition);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  height: 4px;
  width: 100%;
  background: var(--category-color, var(--accent-cyan));
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--category-color, var(--accent-cyan));
}

.project-category {
  display: inline-block;
  width: fit-content;
  padding: 0.25rem 0.5rem;
  background: var(--category-color, var(--accent-cyan));
  color: white;
  border-radius: 6px;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  margin-bottom: var(--spacing-xs);
}

.project-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.35rem;
  line-height: 1.3;
}

.project-status {
  display: inline-block;
  margin-bottom: 0.35rem;
  padding: 0.15rem 0.4rem;
  border: 1px solid #d32f2f;
  color: #d32f2f;
  background: #ffebee;
  border-radius: 4px;
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  width: fit-content;
}

.project-description {
  color: var(--color-secondary);
  font-size: 0.78rem;
  margin-bottom: var(--spacing-xs);
  line-height: 1.4;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-bottom: var(--spacing-xs);
  font-size: 0.75rem;
}

.project-language {
  display: inline-block;
  padding: 0.18rem 0.4rem;
  background: var(--color-bg-light);
  color: var(--color-secondary);
  border-radius: 4px;
  font-weight: 500;
}

.project-links {
  display: flex;
  gap: 0.3rem;
  flex-wrap: wrap;
}

.project-link {
  min-width: 72px;
  padding: 0.35rem 0.5rem;
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  text-decoration: none;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.72rem;
  text-align: center;
  transition: var(--transition);
}

.project-link:hover {
  background: var(--category-color, var(--accent-cyan));
  border-color: var(--category-color, var(--accent-cyan));
  color: white;
  transform: translateY(-2px);
}

.projects-empty {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--color-secondary);
  padding: var(--spacing-xl) 0;
  font-size: 1.1rem;
}

/* ===================================
   CONTACT SECTION
   =================================== */

.contact {
  padding: var(--spacing-xl) 0;
  background: linear-gradient(135deg, var(--color-bg-light) 0%, var(--color-bg-white) 100%);
  text-align: center;
}

.contact-content {
  max-width: 600px;
  margin: 0 auto;
}

.contact-content p {
  font-size: 1.1rem;
  color: var(--color-secondary);
  margin-bottom: var(--spacing-xl);
}

.social-links {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
}

.social-link {
  display: inline-block;
  padding: 0.8rem 2rem;
  background: var(--accent-cyan);
  color: white;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 600;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
}

.social-link:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  background: var(--accent-coral);
}

/* ===================================
   FOOTER
   =================================== */

.footer {
  background: var(--color-primary);
  color: var(--color-bg-light);
  padding: var(--spacing-lg) 0;
  text-align: center;
  margin-top: auto;
  font-size: 0.9rem;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */

@media (max-width: 768px) {
  :root {
    --spacing-xl: 2.5rem;
    --spacing-lg: 2rem;
  }

  .hero {
    padding: var(--spacing-lg) 0;
  }

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

  .filter-controls {
    gap: var(--spacing-xs);
  }

  .filter-btn {
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
  }
}

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