/* ===================================
   DNA Arquitectos - Design System
   =================================== */

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;500;600;700&family=Inter:wght@300;400;500;600;700&display=swap');

/* ===================================
   CSS Variables - Design Tokens
   =================================== */
:root {
  /* Color Palette */
  --color-black: #000000;
  --color-charcoal: #1a1a1a;
  --color-dark-grey: #2a2a2a;
  --color-medium-grey: #4a4a4a;
  --color-grey: #6a6a6a;
  --color-light-grey: #9a9a9a;
  --color-lighter-grey: #d0d0d0;
  --color-off-white: #f5f5f5;
  --color-white: #ffffff;

  /* Red Accents */
  --color-red-primary: #c41e3a;
  --color-red-dark: #8b0000;
  --color-red-light: #e63946;

  /* Typography */
  --font-heading: 'Playfair Display', serif;
  --font-body: 'Inter', sans-serif;

  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3);

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
}

/* ===================================
   Reset & Base Styles
   =================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-body);
  background-color: var(--color-charcoal);
  color: var(--color-off-white);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

/* ===================================
   Typography
   =================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

h1 {
  font-size: var(--text-5xl);
  font-weight: 700;
}

h2 {
  font-size: var(--text-4xl);
}

h3 {
  font-size: var(--text-3xl);
}

h4 {
  font-size: var(--text-2xl);
}

p {
  margin-bottom: var(--space-sm);
  color: var(--color-lighter-grey);
}

/* ===================================
   Navigation
   =================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(26, 26, 26, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  transition: var(--transition-base);
}

.navbar.scrolled {
  background: rgba(0, 0, 0, 0.98);
  box-shadow: var(--shadow-lg);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-sm) var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 2px;
}

.logo span {
  color: var(--color-red-primary);
}

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

.nav-links a {
  font-size: var(--text-sm);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
  position: relative;
  padding: var(--space-xs) 0;
}

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

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

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--space-xs);
}

.mobile-menu-toggle span {
  width: 25px;
  height: 2px;
  background: var(--color-white);
  transition: var(--transition-base);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
  position: relative;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-black) 0%, var(--color-charcoal) 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(196, 30, 58, 0.1) 0%, rgba(0, 0, 0, 0.8) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
  padding: var(--space-lg);
  animation: fadeInUp 1s ease;
}

.hero h1 {
  font-size: clamp(2.5rem, 8vw, 6rem);
  margin-bottom: var(--space-lg);
  color: var(--color-white);
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.hero-subtitle {
  font-size: var(--text-xl);
  color: var(--color-lighter-grey);
  margin-bottom: var(--space-xl);
  font-weight: 300;
  letter-spacing: 2px;
}

.hero-accent {
  color: var(--color-red-primary);
  font-weight: 700;
}

.cta-button {
  display: inline-block;
  padding: var(--space-md) var(--space-xl);
  background: var(--color-red-primary);
  color: var(--color-white);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  border-radius: var(--radius-sm);
  transition: var(--transition-base);
  box-shadow: var(--shadow-lg);
}

.cta-button:hover {
  background: var(--color-red-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

/* ===================================
   Section Styles
   =================================== */
.section {
  padding: var(--space-3xl) var(--space-lg);
  max-width: 1400px;
  margin: 0 auto;
}

.section-title {
  text-align: center;
  margin-bottom: var(--space-2xl);
  position: relative;
  animation: fadeInUp 0.8s ease;
}

.section-title h2 {
  font-size: var(--text-4xl);
  color: var(--color-white);
  margin-bottom: var(--space-sm);
}

.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 3px;
  background: var(--color-red-primary);
  margin: var(--space-md) auto 0;
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--color-light-grey);
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

/* ===================================
   About Section
   =================================== */
.about {
  background: var(--color-dark-grey);
  position: relative;
  z-index: 10;
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
  margin-top: var(--space-xl);
}

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

.about-logo {
  max-width: 200px;
  height: auto;
  margin-bottom: var(--space-lg);
}

.about-text p {
  font-size: var(--text-lg);
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.about-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.feature-card {
  background: rgba(255, 255, 255, 0.05);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: var(--transition-base);
}

.feature-card:hover {
  background: rgba(255, 255, 255, 0.08);
  transform: translateY(-5px);
  border-color: var(--color-red-primary);
}

.feature-card h4 {
  color: var(--color-white);
  margin-bottom: var(--space-sm);
  font-size: var(--text-xl);
}

.feature-card p {
  font-size: var(--text-sm);
  color: var(--color-light-grey);
}

/* ===================================
   Portfolio Section
   =================================== */
.portfolio {
  background: var(--color-charcoal);
}

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

.project-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  aspect-ratio: 4/3;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  transition: var(--transition-base);
}

.project-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-xl);
}

.project-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-slow);
}

.project-card:hover .project-image {
  transform: scale(1.1);
}

.project-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.95) 0%, rgba(0, 0, 0, 0.3) 50%, transparent 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-lg);
  opacity: 0;
  transition: var(--transition-base);
}

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

.project-overlay h3 {
  color: var(--color-white);
  font-size: var(--text-2xl);
  margin-bottom: var(--space-xs);
  transform: translateY(20px);
  transition: var(--transition-base);
}

.project-card:hover .project-overlay h3 {
  transform: translateY(0);
}

.project-overlay p {
  color: var(--color-lighter-grey);
  font-size: var(--text-sm);
  transform: translateY(20px);
  transition: var(--transition-base);
  transition-delay: 0.1s;
}

.project-card:hover .project-overlay p {
  transform: translateY(0);
}

.project-category {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-red-primary);
  color: var(--color-white);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 1px;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-sm);
  transform: translateY(20px);
  transition: var(--transition-base);
  transition-delay: 0.05s;
}

.project-card:hover .project-category {
  transform: translateY(0);
}

/* ===================================
   Contact Section
   =================================== */
.contact {
  background: linear-gradient(180deg, var(--color-charcoal) 0%, var(--color-black) 100%);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  margin-top: var(--space-xl);
}

.contact-info h3 {
  color: var(--color-red-primary);
  margin-bottom: var(--space-lg);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  padding: var(--space-md);
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-red-primary);
  transition: var(--transition-base);
}

.contact-item:hover {
  background: rgba(255, 255, 255, 0.05);
  transform: translateX(5px);
}

.contact-item h4 {
  color: var(--color-white);
  font-size: var(--text-lg);
  margin-bottom: var(--space-xs);
}

.contact-item p {
  color: var(--color-light-grey);
  font-size: var(--text-base);
}

.contact-form {
  background: rgba(255, 255, 255, 0.05);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-group label {
  display: block;
  color: var(--color-white);
  font-weight: 500;
  margin-bottom: var(--space-xs);
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--space-md);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  color: var(--color-white);
  font-family: var(--font-body);
  font-size: var(--text-base);
  transition: var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-red-primary);
  background: rgba(255, 255, 255, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 150px;
}

.submit-button {
  width: 100%;
  padding: var(--space-md);
  background: var(--color-red-primary);
  color: var(--color-white);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-base);
  font-size: var(--text-base);
}

.submit-button:hover {
  background: var(--color-red-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* ===================================
   Footer
   =================================== */
.footer {
  background: var(--color-black);
  padding: var(--space-2xl) var(--space-lg) var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.footer-section h4 {
  color: var(--color-white);
  margin-bottom: var(--space-md);
  font-size: var(--text-xl);
}

.footer-section p {
  color: var(--color-light-grey);
  font-size: var(--text-sm);
  line-height: 1.8;
}

.social-links {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.social-links a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  transition: var(--transition-base);
}

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

.footer-bottom {
  text-align: center;
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--color-grey);
  font-size: var(--text-sm);
}

/* ===================================
   Animations
   =================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: rgba(0, 0, 0, 0.98);
    flex-direction: column;
    justify-content: flex-start;
    padding: var(--space-xl);
    transition: var(--transition-base);
  }

  .nav-links.active {
    left: 0;
  }

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

  .hero h1 {
    font-size: var(--text-4xl);
  }

  .hero-subtitle {
    font-size: var(--text-base);
  }

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

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

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

  .section {
    padding: var(--space-2xl) var(--space-md);
  }

  .section-title h2 {
    font-size: var(--text-3xl);
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: var(--text-3xl);
  }

  .section-title h2 {
    font-size: var(--text-2xl);
  }

  .nav-container {
    padding: var(--space-sm) var(--space-md);
  }
}