/* ============================================
   INDUSTRIAL MODERNISM + CYBER MINIMALISM
   Design System for David Quintana Portfolio
   ============================================ */

/* ============================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================ */
:root {
  /* Color Palette */
  --black: #000000;
  --charcoal: #0D0D0D;
  --gunmetal: #1A1A1A;
  --steel-gray: #2E2E2E;
  --soft-white: #F2F2F2;
  --muted-silver: #C4C4C4;
  --cyber-orange: #FF6A00;
  --cyber-orange-hover: #FF7A1A;
  --warning-amber: #FFB300;
  --orange-glow: rgba(255, 106, 0, 0.45);
  --grid-overlay: rgba(255, 255, 255, 0.03);

  /* Spacing Scale (4px base) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --space-16: 64px;
  --space-24: 96px;

  /* Typography */
  --font-headline: 'Anton', 'Bebas Neue', 'Impact', sans-serif;
  --font-body: 'Inter', 'IBM Plex Sans', 'Space Grotesk', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  /* Transitions */
  --transition-fast: 150ms ease-out;
  --transition-base: 250ms ease-out;
  --transition-slow: 400ms ease-out;
}

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

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  background-color: var(--charcoal);
  color: var(--soft-white);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* ============================================
   TYPOGRAPHY SYSTEM
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-headline);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  text-transform: uppercase;
}

h2 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  text-transform: uppercase;
}

h3 {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  text-transform: uppercase;
  color: var(--cyber-orange);
}

h4 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  letter-spacing: 0.02em;
}

p {
  margin-bottom: var(--space-4);
  color: var(--muted-silver);
}

strong {
  color: var(--soft-white);
  font-weight: 600;
}

a {
  color: var(--cyber-orange);
  text-decoration: none;
  position: relative;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--cyber-orange-hover);
}

a:focus-visible {
  outline: 2px solid var(--cyber-orange);
  outline-offset: 4px;
  border-radius: 2px;
}

/* ============================================
   GRID OVERLAY TEXTURE (OPTIONAL ACCENT)
   ============================================ */
.logo-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  opacity: 0.03;
  pointer-events: none;
  background-image: 
    linear-gradient(var(--grid-overlay) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-overlay) 1px, transparent 1px);
  background-size: 32px 32px;
}

.bg-logo {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-headline);
  font-size: 40vw;
  color: var(--gunmetal);
  opacity: 0.15;
  letter-spacing: -0.05em;
  user-select: none;
}

/* ============================================
   FLOATING LANGUAGE TOGGLE
   ============================================ */
.floating-toggle {
  position: fixed;
  top: var(--space-6);
  right: var(--space-6);
  z-index: 1000;
  background: var(--black);
  border: 2px solid var(--cyber-orange);
  padding: var(--space-2) var(--space-4);
  border-radius: 0;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  display: flex;
  gap: var(--space-2);
  align-items: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.floating-toggle:hover {
  background: var(--cyber-orange);
  transform: translateY(-2px);
}

.floating-toggle span {
  color: var(--soft-white);
  font-weight: 600;
  transition: color var(--transition-fast);
}

.floating-toggle span.inactive {
  color: var(--steel-gray);
}

.floating-toggle:hover span {
  color: var(--black);
}

/* ============================================
   SITE HEADER
   ============================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 900;
  background: rgba(13, 13, 13, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--steel-gray);
  padding: var(--space-4) 0;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-6);
}

.brand h1 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  margin-bottom: var(--space-1);
  color: var(--soft-white);
}

.brand a {
  color: var(--soft-white);
}

.brand a:hover {
  color: var(--cyber-orange);
}

.tagline {
  font-size: 0.875rem;
  color: var(--muted-silver);
  margin-bottom: 0;
  max-width: 600px;
}

.nav {
  display: flex;
  gap: var(--space-6);
  align-items: center;
}

.nav a {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted-silver);
  position: relative;
  padding-bottom: var(--space-1);
}

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

.nav a:hover {
  color: var(--soft-white);
}

.nav a:hover::after {
  width: 100%;
}

.nav a.cta {
  background: var(--black);
  border: 2px solid var(--cyber-orange);
  padding: var(--space-2) var(--space-4);
  color: var(--cyber-orange);
}

.nav a.cta::after {
  display: none;
}

.nav a.cta:hover {
  background: var(--cyber-orange);
  color: var(--black);
}

/* ============================================
   CONTAINER & LAYOUT
   ============================================ */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section-spacing {
  padding: var(--space-24) 0;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
  min-height: 80vh;
}

.hero-left h2 {
  margin-bottom: var(--space-6);
  position: relative;
}

.hero-left h2::before {
  content: '';
  position: absolute;
  left: -var(--space-4);
  top: 0;
  width: 4px;
  height: 100%;
  background: var(--cyber-orange);
  animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { opacity: 1; box-shadow: 0 0 8px var(--orange-glow); }
  50% { opacity: 0.6; box-shadow: 0 0 16px var(--orange-glow); }
}

.hero-left p {
  font-size: 1.125rem;
  margin-bottom: var(--space-8);
}

.hero-cta-group {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: var(--space-4) var(--space-8);
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 2px solid var(--cyber-orange);
  background: var(--black);
  color: var(--cyber-orange);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: var(--cyber-orange);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width var(--transition-base), height var(--transition-base);
  z-index: -1;
}

.btn:hover::before {
  width: 300%;
  height: 300%;
}

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

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--cyber-orange);
  color: var(--black);
}

.btn-secondary {
  background: transparent;
}

.hero-right {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
}

.profile-photo {
  width: 100%;
  max-width: 400px;
  height: auto;
  border: 3px solid var(--cyber-orange);
  filter: grayscale(20%);
  transition: all var(--transition-base);
}

.profile-photo:hover {
  filter: grayscale(0%);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--orange-glow);
}

.hero-nav {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  justify-content: center;
}

.hero-nav-btn {
  padding: var(--space-3) var(--space-6);
  border: 1px solid var(--steel-gray);
  background: var(--gunmetal);
  color: var(--muted-silver);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: all var(--transition-fast);
}

.hero-nav-btn:hover {
  border-color: var(--cyber-orange);
  background: var(--black);
  color: var(--cyber-orange);
  transform: translateY(-2px);
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-12);
  align-items: start;
  background: var(--gunmetal);
  padding: var(--space-12);
  border: 1px solid var(--steel-gray);
  position: relative;
}

.about::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--cyber-orange);
}

.about-text h3 {
  margin-bottom: var(--space-6);
}

.about-photo img {
  width: 100%;
  height: auto;
  border: 2px solid var(--steel-gray);
  transition: all var(--transition-base);
}

.about-photo img:hover {
  border-color: var(--cyber-orange);
  transform: translateY(-4px);
}

/* ============================================
   PROJECTS SECTION
   ============================================ */
.projects {
  background: var(--black);
  padding: var(--space-12);
  border-top: 1px solid var(--steel-gray);
  border-bottom: 1px solid var(--steel-gray);
}

.section-header {
  margin-bottom: var(--space-12);
  text-align: center;
}

.section-header h3 {
  margin-bottom: var(--space-4);
}

.section-header p {
  font-size: 1.125rem;
  max-width: 800px;
  margin: 0 auto;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-8);
}

.project-card {
  background: var(--gunmetal);
  border: 1px solid var(--steel-gray);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 40px 40px 0;
  border-color: transparent var(--cyber-orange) transparent transparent;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyber-orange);
}

.project-card:hover::before {
  opacity: 1;
}

.project-image-wrapper {
  width: 100%;
  height: 240px;
  overflow: hidden;
  background: var(--black);
}

.project-image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
  filter: grayscale(30%);
}

.project-card:hover .project-image-wrapper img {
  transform: scale(1.05);
  filter: grayscale(0%);
}

.project-body {
  padding: var(--space-6);
}

.project-body h4 {
  color: var(--soft-white);
  margin-bottom: var(--space-2);
}

.project-subtitle {
  font-size: 0.875rem;
  color: var(--cyber-orange);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.project-desc {
  font-size: 1rem;
  margin-bottom: var(--space-4);
}

.project-highlights {
  list-style: none;
  margin-bottom: var(--space-6);
}

.project-highlights li {
  padding-left: var(--space-4);
  margin-bottom: var(--space-4);
  position: relative;
  font-size: 0.9375rem;
  line-height: 1.6;
}

.project-highlights li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--cyber-orange);
  font-weight: bold;
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding-top: var(--space-4);
  border-top: 1px solid var(--steel-gray);
}

.project-links a {
  padding: var(--space-2) var(--space-4);
  background: var(--black);
  border: 1px solid var(--steel-gray);
  color: var(--muted-silver);
  font-size: 0.875rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.project-links a:hover {
  border-color: var(--cyber-orange);
  color: var(--cyber-orange);
  background: var(--charcoal);
}

/* ============================================
   SKILLS SECTION
   ============================================ */
.skills {
  background: var(--charcoal);
}

.skills-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-8);
}

.skill-detail-card {
  background: var(--gunmetal);
  border: 1px solid var(--steel-gray);
  padding: var(--space-8);
  position: relative;
  transition: all var(--transition-base);
}

.skill-detail-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--cyber-orange);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.skill-detail-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyber-orange);
}

.skill-detail-card:hover::after {
  transform: scaleX(1);
}

.skill-detail-card h4 {
  color: var(--cyber-orange);
  margin-bottom: var(--space-6);
  font-size: 1.5rem;
}

.skill-list {
  list-style: none;
}

.skill-list li {
  padding-left: var(--space-4);
  margin-bottom: var(--space-4);
  position: relative;
  font-size: 0.9375rem;
  line-height: 1.7;
}

.skill-list li::before {
  content: '◆';
  position: absolute;
  left: 0;
  color: var(--cyber-orange);
  font-size: 0.75rem;
}

.skill-list strong {
  display: block;
  color: var(--soft-white);
  margin-bottom: var(--space-1);
}

/* ============================================
   SERVICES SECTION
   ============================================ */
.services {
  background: var(--black);
}

.services h3 {
  text-align: center;
  margin-bottom: var(--space-12);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-8);
}

.service-card {
  background: var(--gunmetal);
  border: 2px solid var(--steel-gray);
  padding: var(--space-8);
  position: relative;
  transition: all var(--transition-base);
}

.service-card::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(135deg, var(--cyber-orange), var(--warning-amber));
  z-index: -1;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.service-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyber-orange);
}

.service-card:hover::before {
  opacity: 1;
}

.service-card h4 {
  color: var(--cyber-orange);
  margin-bottom: var(--space-4);
  font-size: 1.25rem;
}

.service-card p {
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 0;
}

/* ============================================
   CONTACT SECTION
   ============================================ */
#contact {
  background: var(--gunmetal);
  padding: var(--space-16) 0;
}

#contact h3 {
  text-align: center;
  margin-bottom: var(--space-8);
}

.contact-card {
  max-width: 800px;
  margin: 0 auto;
  background: var(--charcoal);
  border: 2px solid var(--cyber-orange);
  padding: var(--space-12);
  text-align: center;
}

.contact-intro {
  font-size: 1.25rem;
  margin-bottom: var(--space-8);
  color: var(--soft-white);
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: center;
}

.contact-link-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-6);
  background: var(--black);
  border: 2px solid var(--steel-gray);
  color: var(--soft-white);
  font-weight: 600;
  font-size: 0.9375rem;
  transition: all var(--transition-fast);
}

.contact-link-btn svg {
  transition: transform var(--transition-fast);
}

.contact-link-btn:hover {
  background: var(--cyber-orange);
  border-color: var(--cyber-orange);
  color: var(--black);
  transform: translateY(-2px);
}

.contact-link-btn:hover svg {
  transform: scale(1.1);
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  background: var(--black);
  border-top: 1px solid var(--steel-gray);
  padding: var(--space-8) 0;
  text-align: center;
}

.site-footer p {
  font-size: 0.875rem;
  color: var(--muted-silver);
  margin-bottom: 0;
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
[lang-block] {
  display: none;
}

[lang-block][data-active="true"] {
  display: block;
}

.nav [lang-block][data-active="true"] {
  display: inline-block;
}

/* ============================================
   ANIMATIONS (Scroll Reveal - Applied via JS)
   ============================================ */
.fade-in-up {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1024px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-left h2::before {
    display: none;
  }

  .hero-cta-group {
    justify-content: center;
  }

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

  .nav {
    flex-wrap: wrap;
  }
}

@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    text-align: center;
  }

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

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

  .skills-card-grid {
    grid-template-columns: 1fr;
  }

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

  .floating-toggle {
    top: var(--space-4);
    right: var(--space-4);
  }
}

/* ============================================
   ACCESSIBILITY ENHANCEMENTS
   ============================================ */
:focus-visible {
  outline: 2px solid var(--cyber-orange);
  outline-offset: 4px;
}

@media (prefers-reduced-motion: reduce) {
  .fade-in-up {
    opacity: 1;
    transform: none;
  }
  
  .btn::before,
  .project-card::before,
  .skill-detail-card::after,
  .service-card::before {
    display: none;
  }
}

/* Skip to main content link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--cyber-orange);
  color: var(--black);
  padding: var(--space-3) var(--space-4);
  text-decoration: none;
  font-weight: bold;
  z-index: 9999;
}

.skip-link:focus {
  top: 0;
}