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

:root {
  /* Colors */
  --color-bg: #0a0a0a;
  --color-bg-secondary: #1a1a1a;
  --color-bg-tertiary: #2a2a2a;
  --color-text: #e8e8e8;
  --color-text-secondary: #a0a0a0;
  --color-primary: #1a7a7a;
  --color-primary-hover: #156666;
  --color-primary-light: #e8f5f5;
  --color-primary-mid: #c2e0e0;
  --color-accent: #8b5cf6;
  --color-success: #10b981;
  --color-border: #333;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;

  /* Layout */
  --container-max: 1200px;
  --header-height: 70px;

  /* Transitions */
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--color-text);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: 1.25rem; }

p {
  margin-bottom: 1rem;
  color: var(--color-text-secondary);
}

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

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

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-bg-secondary);
  padding: 0.2em 0.4em;
  border-radius: 3px;
  color: var(--color-accent);
}

pre {
  background: var(--color-bg-secondary);
  padding: 1.5rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--color-border);
}

pre code {
  background: none;
  padding: 0;
  font-size: 0.9rem;
  color: var(--color-text);
}

/* ==========================================================================
   Layout
   ========================================================================== */

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

main {
  min-height: calc(100vh - var(--header-height) - 200px);
  padding-top: var(--header-height);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(10, 10, 10, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
}

.navbar {
  height: 100%;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  transition: color var(--transition);
}

.logo:hover .logo-text {
  color: var(--color-primary);
}

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

.nav-link {
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  transition: all var(--transition);
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

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

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

.hero {
  min-height: calc(100vh - var(--header-height));
  display: flex;
  align-items: center;
  padding: var(--space-xl) 0;
}

.hero-content {
  max-width: 800px;
}

.hero-subtitle {
  color: var(--color-primary);
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: var(--space-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.hero h1 {
  margin-bottom: var(--space-md);
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
  line-height: 1.7;
}

.hero-tagline {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  font-style: italic;
}

.hero-avatar {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--color-primary);
  margin-bottom: var(--space-md);
  box-shadow: 0 10px 30px rgba(26, 122, 122, 0.3);
}

.hero-cta {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  border-radius: 8px;
  font-weight: 500;
  font-size: 1rem;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  text-align: center;
}

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

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(26, 122, 122, 0.3);
}

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

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

/* ==========================================================================
   Sections
   ========================================================================== */

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

.section-title {
  text-align: center;
  margin-bottom: var(--space-lg);
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  margin: var(--space-sm) auto 0;
  border-radius: 2px;
}

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

.about-content {
  max-width: 900px;
  margin: 0 auto;
}

.about-text h3 {
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.about-text ul {
  list-style: none;
  margin: var(--space-md) 0;
}

.about-text li {
  padding: 0.5rem 0;
  padding-left: 1.5rem;
  position: relative;
  color: var(--color-text-secondary);
}

.about-text li::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-size: 1.2rem;
}

/* ==========================================================================
   Services Section
   ========================================================================== */

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

.service-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-primary);
  border-radius: 12px;
  padding: var(--space-md);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.service-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(26, 122, 122, 0.2);
}

.service-card h3 {
  color: var(--color-primary);
  font-size: 1.1rem;
  margin-bottom: var(--space-sm);
}

.service-card .service-intro {
  font-size: 0.95rem;
  font-style: italic;
  margin-bottom: var(--space-sm);
  color: var(--color-text-secondary);
}

.service-card ul {
  list-style: none;
  margin: var(--space-sm) 0;
}

.service-card li {
  padding: 0.35rem 0;
  padding-left: 1.25rem;
  position: relative;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

.service-card li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: bold;
}

.service-deliverable {
  margin-top: var(--space-sm);
  font-size: 0.875rem;
  color: var(--color-primary);
  font-weight: 500;
  border-top: 1px solid var(--color-primary-mid);
  padding-top: var(--space-sm);
}

/* ==========================================================================
   Projects Section
   ========================================================================== */

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--space-md);
}

.project-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: var(--space-md);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transform: scaleX(0);
  transition: transform var(--transition);
}

.project-card:hover {
  transform: translateY(-5px);
  border-color: var(--color-primary);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
}

.project-card:hover::before {
  transform: scaleX(1);
}

.project-card h3 {
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.project-card p {
  margin-bottom: var(--space-md);
  font-size: 0.95rem;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: var(--space-md);
}

.tag {
  background: var(--color-bg-tertiary);
  color: var(--color-primary);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid var(--color-primary-mid);
}

.project-link {
  color: var(--color-primary);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

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

.badge-wip {
  display: inline-block;
  background: rgba(26, 122, 122, 0.15);
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  border-radius: 6px;
  padding: 0.2rem 0.7rem;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  letter-spacing: 0.03em;
}

/* Other Projects */
.other-projects {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
}

.other-projects h2 {
  color: var(--color-text-secondary);
  font-size: 1.4rem;
  margin-bottom: var(--space-md);
}

/* ==========================================================================
   Project Detail Page
   ========================================================================== */

.project-detail {
  padding: var(--space-lg) 0;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  font-weight: 500;
}

.back-link:hover {
  color: var(--color-primary);
  gap: 0.75rem;
}

.project-header {
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.project-header .lead {
  font-size: 1.25rem;
  color: var(--color-text);
  margin: var(--space-md) 0;
}

.project-header .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: var(--space-md);
}

.project-content {
  max-width: 800px;
}

.project-content h2 {
  margin-top: var(--space-lg);
  margin-bottom: var(--space-md);
  color: var(--color-primary);
}

.project-content h3 {
  margin-top: var(--space-md);
  margin-bottom: var(--space-sm);
}

.project-content img {
  max-width: 100%;
  border-radius: 8px;
  margin: var(--space-md) 0;
}

.figure-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin: var(--space-md) 0;
}

.figure-grid figure {
  margin: 0;
}

.figure-grid figure img {
  width: 100%;
  margin: 0 0 0.5rem 0;
}

.figure-grid figcaption {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  text-align: center;
  font-style: italic;
}

@media (max-width: 600px) {
  .figure-grid {
    grid-template-columns: 1fr;
  }
}

.project-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-md) 0;
  font-size: 0.95rem;
}

.project-content th,
.project-content td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.project-content th {
  background: var(--color-bg-secondary);
  font-weight: 600;
  color: var(--color-text);
}

.project-content tr:hover {
  background: var(--color-bg-secondary);
}

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

.contact-content {
  max-width: 700px;
  margin: 0 auto;
}

.contact-subtitle {
  text-align: center;
  font-size: 1.1rem;
  margin-bottom: var(--space-lg);
  color: var(--color-text-secondary);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.contact-form input,
.contact-form textarea {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1rem;
  transition: border-color var(--transition);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.contact-form textarea {
  min-height: 140px;
  resize: vertical;
}

.contact-form button[type="submit"] {
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 0.85rem 2rem;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  align-self: flex-start;
}

.contact-form button[type="submit"]:hover {
  background: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(26, 122, 122, 0.3);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: var(--space-md);
}

.contact-info a {
  color: var(--color-text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.95rem;
  transition: color var(--transition);
}

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

.contact-links {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-lg);
  flex-wrap: wrap;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-weight: 500;
  transition: all var(--transition);
}

.contact-link:hover {
  border-color: var(--color-primary);
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.contact-link i {
  font-size: 1.25rem;
}

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

.site-footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: var(--space-lg) 0 var(--space-md);
  margin-top: var(--space-xl);
}

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

.footer-info h3 {
  margin-bottom: 0.5rem;
  font-size: 1.25rem;
}

.footer-info p {
  color: var(--color-text-secondary);
  margin: 0;
}

.footer-social {
  display: flex;
  gap: var(--space-sm);
}

.footer-social a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-tertiary);
  border-radius: 50%;
  color: var(--color-text);
  transition: all var(--transition);
}

.footer-social a:hover {
  background: var(--color-primary);
  color: white;
  transform: translateY(-3px);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
}

.footer-bottom p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin: 0;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

@media (max-width: 992px) {
  .services-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --space-lg: 3rem;
    --space-xl: 4rem;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(10px);
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
    gap: 0;
  }

  .nav-menu.active {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .about-content {
    grid-template-columns: 1fr;
  }

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

  .footer-content {
    flex-direction: column;
    text-align: center;
  }

  .contact-links {
    flex-direction: column;
  }

  .contact-link {
    width: 100%;
    justify-content: center;
  }

  .contact-form button[type="submit"] {
    align-self: stretch;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  .hero-cta {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}

/* ==========================================================================
   Animations
   ========================================================================== */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

/* Smooth reveal for sections */
section > * {
  animation: fadeInUp 0.8s ease-out;
  animation-fill-mode: both;
}

section > *:nth-child(1) { animation-delay: 0.1s; }
section > *:nth-child(2) { animation-delay: 0.2s; }
section > *:nth-child(3) { animation-delay: 0.3s; }