/* ============================================
   Manuel Alvarez Portfolio - Clean Minimalist Style
   Inspired by create.treydenc.com
   ============================================ */

/* CSS Variables */
:root {
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-text-light: #666666;
  --color-text-lighter: #999999;
  --color-border: #e5e5e5;
  --color-hover: #000000;

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

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;

  --max-width: 1400px;
  --header-height: 80px;

  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

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

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

/* ============================================
   Header
   ============================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--color-bg);
  z-index: 1000;
  border-bottom: 1px solid var(--color-border);
}

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

.logo {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

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

.main-nav {
  display: flex;
  gap: var(--spacing-lg);
}

.main-nav a {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--color-text-light);
  position: relative;
}

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

.main-nav a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--color-text);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  gap: 5px;
}

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

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

.mobile-menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

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

/* Mobile Navigation */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg);
  z-index: 999;
  padding: var(--spacing-xl);
}

.mobile-nav.active {
  display: block;
}

.mobile-nav nav {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.mobile-nav a {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--color-text-light);
}

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

/* ============================================
   Masthead / Hero
   ============================================ */
.masthead {
  margin-top: var(--header-height);
  padding: var(--spacing-3xl) var(--spacing-lg);
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.masthead-content {
  max-width: 800px;
  margin: 0 auto;
}

.masthead-title {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.masthead-subtitle {
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   Project Grid
   ============================================ */
.site-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
}

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

/* Project Card */
.project-card {
  display: block;
  text-decoration: none;
  transition: transform var(--transition-medium);
}

.project-card:hover {
  transform: translateY(-4px);
}

.project-image {
  position: relative;
  width: 100%;
  padding-bottom: 78.125%; /* 16:12.5 aspect ratio */
  overflow: hidden;
  background: var(--color-border);
  margin-bottom: var(--spacing-md);
}

.project-image img,
.project-image-placeholder {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow), opacity var(--transition-medium);
}

.project-card:hover .project-image img,
.project-card:hover .project-image-placeholder {
  transform: scale(1.03);
}

/* Placeholder styling for projects without images */
.project-image-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
}

.placeholder-text {
  font-size: 0.85rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.project-info {
  padding: 0 var(--spacing-xs);
}

.project-title {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--spacing-xs);
  transition: color var(--transition-fast);
}

.project-card:hover .project-title {
  color: var(--color-hover);
}

.project-description {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  margin-top: var(--spacing-3xl);
  padding: var(--spacing-xl) var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
}

.footer-social {
  display: flex;
  gap: var(--spacing-lg);
}

.footer-social a {
  font-size: 0.9rem;
  color: var(--color-text-light);
}

.footer-social a:hover {
  color: var(--color-text);
}

.footer-copyright {
  font-size: 0.8rem;
  color: var(--color-text-lighter);
}

/* ============================================
   About Page Styles
   ============================================ */
.about-content {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-3xl) var(--spacing-lg);
}

.about-header {
  margin-bottom: var(--spacing-2xl);
}

.about-header h1 {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.about-header .subtitle {
  font-size: 1.1rem;
  color: var(--color-text-light);
}

.about-section {
  margin-bottom: var(--spacing-2xl);
}

.about-section h2 {
  font-size: 0.85rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-lighter);
  margin-bottom: var(--spacing-md);
}

.about-section p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
}

.about-section p:last-child {
  margin-bottom: 0;
}

/* Experience List */
.experience-list {
  list-style: none;
}

.experience-item {
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-border);
}

.experience-item:last-child {
  border-bottom: none;
}

.experience-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--spacing-xs);
}

.experience-company {
  font-weight: 500;
  color: var(--color-text);
}

.experience-date {
  font-size: 0.85rem;
  color: var(--color-text-lighter);
}

.experience-role {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xs);
}

.experience-description {
  font-size: 0.9rem;
  color: var(--color-text-light);
}

/* Skills */
.skills-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.skill-tag {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: #f5f5f5;
  font-size: 0.85rem;
  color: var(--color-text);
  border-radius: 4px;
}

/* ============================================
   Project Detail Page
   ============================================ */
.project-detail {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--spacing-3xl) var(--spacing-lg);
}

.project-detail-header {
  margin-bottom: var(--spacing-2xl);
  text-align: center;
}

.project-detail-header .category {
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-lighter);
  margin-bottom: var(--spacing-sm);
}

.project-detail-header h1 {
  font-size: 2.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.project-detail-header .subtitle {
  font-size: 1.25rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
}

.project-meta {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  font-size: 0.9rem;
  color: var(--color-text-lighter);
}

.project-detail-content {
  margin-bottom: var(--spacing-2xl);
}

.project-detail-content h2 {
  font-size: 0.85rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-lighter);
  margin-bottom: var(--spacing-md);
  margin-top: var(--spacing-2xl);
}

.project-detail-content h2:first-child {
  margin-top: 0;
}

.project-detail-content p {
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
}

.project-detail-content ul {
  list-style: none;
  margin-bottom: var(--spacing-md);
}

.project-detail-content li {
  position: relative;
  padding-left: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  font-size: 1rem;
  line-height: 1.6;
}

.project-detail-content li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  background: var(--color-text);
  border-radius: 50%;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xl);
}

.back-link:hover {
  color: var(--color-text);
}

.back-link svg {
  width: 16px;
  height: 16px;
}

/* Tech Tags */
.tech-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-sm);
}

.tech-tag {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: #f5f5f5;
  font-size: 0.85rem;
  color: var(--color-text);
  border-radius: 4px;
}

/* Links */
.project-links {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  font-size: 0.9rem;
  border-radius: 4px;
  transition: all var(--transition-fast);
}

.project-link:hover {
  background: var(--color-text);
  color: var(--color-bg);
  border-color: var(--color-text);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .main-nav {
    display: none;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .masthead {
    padding: var(--spacing-2xl) var(--spacing-md);
  }

  .masthead-title {
    font-size: 1.5rem;
  }

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

  .site-content {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  .footer-social {
    flex-wrap: wrap;
    justify-content: center;
  }

  .experience-header {
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .project-meta {
    flex-direction: column;
    gap: var(--spacing-xs);
  }
}

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

  .masthead-title {
    font-size: 1.25rem;
  }

  .masthead-subtitle {
    font-size: 1rem;
  }
}

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

.project-card {
  animation: fadeInUp 0.6s ease forwards;
  opacity: 0;
}

.project-card:nth-child(1) { animation-delay: 0.1s; }
.project-card:nth-child(2) { animation-delay: 0.15s; }
.project-card:nth-child(3) { animation-delay: 0.2s; }
.project-card:nth-child(4) { animation-delay: 0.25s; }
.project-card:nth-child(5) { animation-delay: 0.3s; }
.project-card:nth-child(6) { animation-delay: 0.35s; }

/* Page transitions */
.site-content,
.about-content,
.project-detail {
  animation: fadeInUp 0.5s ease forwards;
}