/* Modern AI Portfolio CSS */

/* thexperiment - Bold Minimalist Design System */
:root {
  /* Experimental Color Palette - Cyan Edition */
  --accent-cyan: #00d4ff;
  --accent-blue: #0099ff;
  --accent-pink: #ff0080;
  --accent-gold: #ffd700;

  /* Minimalist Foundation - Airy White Background */
  --pure-white: #FFFFFF;
  --soft-gray: #FFFFFF; /* Changed to pure white for airy design */
  --light-gray: #FFFFFF; /* Changed to pure white */
  --border-gray: #E8E8E8;
  --deep-black: #0A0A0A;
  --text-gray: #4A4A4A;
  --subtle-gray: #737373;

  /* Navigation - Light Teal (from logo) */
  --nav-background: #F0FAFB;

  /* Experimental Typography */
  --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  --font-weight-black: 900;

  /* Bold Typography System - Confident & Conversational */
  --font-size-nav: 1rem; /* 16px */
  --font-size-small: 0.875rem; /* 14px */
  --font-size-base: 1rem; /* 16px */
  --font-size-lede: clamp(1.375rem, 1.75vw, 1.75rem); /* 22px → 28px subtitle */
  --font-size-h3: clamp(1.5rem, 2vw, 1.75rem); /* 24px → 28px card titles */
  --font-size-h2: clamp(2.5rem, 4vw, 3.5rem); /* 40px → 56px section titles */
  --font-size-h1: clamp(3.5rem, 7vw, 6rem); /* 56px → 96px HERO */

  /* Bold Spacing System - Generous & Intentional */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --space-4xl: 8rem;
  --space-5xl: 12rem;

  /* Comfortable Section Rhythm */
  --section-spacing: 10rem;
  --content-spacing: var(--space-3xl);
  --element-spacing: var(--space-lg);

  /* Sharp Design Language - Less Polite */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.5rem;
  --radius-2xl: 1rem;
  --radius-full: 9999px;

  /* Bold Card Shadows - Elevated Design */
  --shadow-subtle: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-soft: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-strong: 0 8px 32px rgba(0, 0, 0, 0.12);
  --shadow-bold: 0 16px 48px rgba(0, 0, 0, 0.15);

  /* Smooth Transitions */
  --transition-quick: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-gentle: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

  /* Expansive Container System - Own the Space */
  --container-main: 1400px;
  --container-padding: var(--space-2xl);
}

/* Modern Reset for thexperiment */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
  font-size: 16px;
}

@media (min-width: 1024px) {
  html {
    font-size: 18px;
  }
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  color: var(--deep-black);
  background-color: var(--pure-white);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

@media (min-width: 1024px) {
  body {
    font-size: 1.125rem; /* 18px at base 16px */
  }
}

/* Bold Experimental Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-black);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--deep-black);
}

h1 {
  font-size: var(--font-size-h1);
  font-weight: var(--font-weight-black);
  line-height: 1.1;
}

h2 {
  font-size: var(--font-size-h2);
  font-weight: var(--font-weight-black);
  line-height: 1.1;
}

h3 {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-bold);
  line-height: 1.25;
}

h4 {
  font-size: var(--font-size-lede);
  font-weight: var(--font-weight-semibold);
  line-height: 1.4;
}

p {
  color: var(--text-gray);
  line-height: 1.7;
  font-weight: var(--font-weight-normal);
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: all var(--transition-quick);
  font-weight: var(--font-weight-medium);
}

a:hover {
  color: var(--accent-blue);
  transform: translateY(-1px);
}

/* Experimental Layout System */
.container,
.container-narrow {
  max-width: var(--container-main);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

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

.section-title {
  color: var(--deep-black);
  margin-bottom: var(--space-2xl);
  font-weight: var(--font-weight-black);
  font-size: var(--font-size-h2);
  line-height: 0.95;
  letter-spacing: -0.03em;
}

.section-subtitle {
  font-size: var(--font-size-lede);
  color: var(--text-gray);
  max-width: 700px;
  margin: 0 auto;
  font-weight: var(--font-weight-normal);
  line-height: 1.5;
}

/* Experimental Button System */
/* Button Scale System */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  border: none;
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-smooth);
  position: relative;
  white-space: nowrap;
}

/* Primary Medium - Default */
.btn-md {
  height: 3rem; /* 48px */
  padding: 0 1.5rem; /* 24px */
  font-size: 1rem; /* 16px */
  border-radius: var(--radius-md);
}

/* Primary Large - Bold Hero CTA */
.btn-lg {
  height: 3rem; /* 48px */
  padding: 0 2.5rem; /* 40px */
  font-size: 1rem; /* 16px */
  border-radius: var(--radius-md);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: var(--font-weight-black);
}

/* Primary Small - Cards */
.btn-sm {
  height: 2.5rem; /* 40px */
  padding: 0 1rem; /* 16px */
  font-size: 0.875rem; /* 14px */
  border-radius: var(--radius-lg);
}

.btn-primary {
  background-color: var(--accent-cyan);
  color: var(--deep-black);
  box-shadow: 4px 4px 0 var(--deep-black);
  border: 3px solid var(--deep-black);
}

.btn-primary:hover {
  background-color: var(--deep-black);
  color: var(--accent-cyan);
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--accent-cyan);
}

.btn-secondary {
  background-color: transparent;
  color: var(--deep-black);
  border: 3px solid var(--deep-black);
}

.btn-secondary:hover {
  background-color: var(--deep-black);
  color: var(--pure-white);
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--deep-black);
}

/* Bold Full-Width Navigation Bar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--deep-black);
  border: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0;
  transition: none;
  box-shadow: none;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2xl);
  max-width: var(--container-main);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  height: 64px;
}

.nav-logo .logo-link {
  font-size: 1.25rem;
  font-weight: var(--font-weight-black);
  color: var(--pure-white);
  letter-spacing: -0.02em;
  text-decoration: none;
  transition: opacity var(--transition-smooth);
}

.nav-logo .logo-link:hover {
  opacity: 0.8;
}

.nav-menu {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--space-xl);
  margin: 0;
  padding: 0;
}

.nav-link {
  color: rgba(255, 255, 255, 0.7);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-nav);
  transition: all var(--transition-quick);
  padding: var(--space-sm) 0;
  border-radius: 0;
  position: relative;
  min-height: 44px;
  display: flex;
  align-items: center;
  text-decoration: none;
}

.nav-link:hover,
.nav-link.active {
  color: var(--pure-white);
  background-color: transparent;
}

.nav-link:hover::after,
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background-color: var(--accent-cyan);
}

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

/* Language Selector - Bold Black/White */
.language-selector {
  display: flex;
  gap: var(--space-sm);
  background-color: transparent;
  border-radius: 0;
  padding: 0;
}

.lang-btn {
  padding: var(--space-xs) var(--space-md);
  border: 2px solid rgba(255, 255, 255, 0.2);
  background-color: transparent;
  color: rgba(255, 255, 255, 0.7);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-quick);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-bold);
  min-height: 44px;
  min-width: 44px;
  text-transform: uppercase;
}

.lang-btn:hover,
.lang-btn.active {
  background-color: var(--pure-white);
  color: var(--deep-black);
  border-color: var(--pure-white);
  box-shadow: none;
}

/* Mobile Navigation Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background-color: var(--pure-white);
  border-radius: 2px;
  transition: all var(--transition-base);
}

/* Bold Experimental Hero Section - Conversational */
.hero {
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  position: relative;
  background-color: var(--pure-white);
  padding: var(--space-4xl) 0 var(--space-5xl) 0;
  margin-top: 64px;
  border-bottom: 1px solid var(--border-gray);
}

.hero-container {
  max-width: var(--container-main);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  position: relative;
  z-index: 2;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}

.geometric-shape {
  position: absolute;
  border-radius: var(--radius-xl);
  opacity: 0.08;
  animation: float 6s ease-in-out infinite;
}

.shape-1 {
  width: 200px;
  height: 200px;
  background-color: var(--accent-blue);
  top: 15%;
  left: 10%;
  animation-delay: -2s;
}

.shape-2 {
  width: 150px;
  height: 150px;
  background-color: var(--accent-cyan);
  top: 70%;
  right: 15%;
  border-radius: var(--radius-full);
  animation-delay: -4s;
}

.shape-3 {
  width: 120px;
  height: 120px;
  background-color: var(--accent-pink);
  top: 40%;
  right: 25%;
  animation-delay: -1s;
}

.shape-4 {
  width: 180px;
  height: 180px;
  background-color: var(--accent-gold);
  bottom: 20%;
  left: 20%;
  border-radius: var(--radius-full);
  animation-delay: -3s;
}

.hero-content {
  text-align: left;
  position: relative;
  z-index: 3;
  max-width: 100%;
}

.hero-title {
  font-size: var(--font-size-h1);
  font-weight: var(--font-weight-black);
  color: var(--deep-black);
  margin-bottom: var(--space-xl);
  letter-spacing: -0.04em;
  line-height: 0.9;
  opacity: 0;
  animation: fadeInUp 0.8s ease-out 0.2s forwards;
  position: relative;
  display: inline-block;
}

.hero-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 240px;
  height: 10px;
  background-color: var(--accent-cyan);
  animation: slideIn 0.6s ease-out 1s forwards;
  transform-origin: left;
  transform: scaleX(0);
}

@keyframes slideIn {
  to {
    transform: scaleX(1);
  }
}

.hero-subtitle {
  font-size: var(--font-size-lede);
  color: var(--text-gray);
  margin-bottom: var(--space-lg);
  font-weight: var(--font-weight-normal);
  line-height: 1.5;
  max-width: 700px;
  opacity: 0;
  animation: fadeInUp 0.8s ease-out 0.6s forwards;
}

.hero-tagline {
  font-size: var(--font-size-base);
  color: var(--text-gray);
  margin-bottom: var(--space-3xl);
  font-weight: var(--font-weight-medium);
  line-height: 1.6;
  font-style: italic;
  max-width: 600px;
  opacity: 0;
  animation: fadeInUp 0.8s ease-out 0.8s forwards;
}

.hero-actions {
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeInUp 0.8s ease-out 1s forwards;
}

.cta-primary-wrapper {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  align-items: flex-start;
}

.cta-time {
  font-size: 0.875rem;
  color: var(--text-gray);
  font-weight: var(--font-weight-medium);
  padding-left: var(--space-xs);
}

/* BuildLab Calendar Section - Compact 2-Column */
.buildlab {
  padding: 4rem 0;
  background-color: var(--pure-white);
  border-bottom: 1px solid var(--border-gray);
  position: relative;
}

.buildlab-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-2xl);
  align-items: center;
}

.buildlab-content {
  padding-right: var(--space-lg);
}

.buildlab-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: var(--font-weight-black);
  color: var(--deep-black);
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.buildlab-subtitle {
  font-size: var(--font-size-base);
  color: var(--text-gray);
  line-height: 1.6;
  font-weight: var(--font-weight-normal);
  margin-bottom: var(--space-xl);
}

.calendar-wrapper {
  padding: 0;
}

.calendar-wrapper iframe {
  display: block;
  box-shadow: 6px 6px 0 var(--deep-black);
  transition: all var(--transition-smooth);
}

.calendar-wrapper iframe:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--deep-black);
}

/* About Section - REMOVED (Keeping styles for potential future use) */
.about {
  padding: var(--section-spacing) 0;
  background-color: #FAFAFA;
  border-top: 1px solid var(--border-gray);
  border-bottom: 1px solid var(--border-gray);
  position: relative;
  display: none;
}

.about-content {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.about-manifesto {
  margin-bottom: var(--content-spacing);
}

.manifesto-text {
  font-size: var(--font-size-lede);
  line-height: 1.6;
  color: var(--deep-black);
  font-weight: var(--font-weight-normal);
  max-width: 100%;
}

.about-text {
  font-size: var(--font-size-lg);
}

.about-stats {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-3xl);
  max-width: 1000px;
  margin: 0 auto;
}

.stat-item {
  text-align: center;
  padding: var(--space-3xl) var(--space-2xl);
  background-color: var(--pure-white);
  border-radius: var(--radius-lg);
  border: 3px solid var(--deep-black);
  transition: all var(--transition-smooth);
  box-shadow: none;
}

.stat-item:nth-child(1) {
  border-top: 16px solid var(--accent-pink);
}

.stat-item:nth-child(2) {
  border-top: 16px solid var(--accent-blue);
}

.stat-item:nth-child(3) {
  border-top: 16px solid var(--accent-cyan);
}

.stat-item:hover {
  transform: translateY(-6px);
}

.stat-item:nth-child(1):hover {
  box-shadow: 8px 8px 0 var(--accent-pink);
}

.stat-item:nth-child(2):hover {
  box-shadow: 8px 8px 0 var(--accent-blue);
}

.stat-item:nth-child(3):hover {
  box-shadow: 8px 8px 0 var(--accent-cyan);
}

.stat-number {
  font-size: 11rem;
  font-weight: var(--font-weight-black);
  color: var(--deep-black);
  margin-bottom: var(--space-md);
  line-height: 0.9;
  letter-spacing: -0.04em;
}

.stat-item:nth-child(2) .stat-number,
.stat-item:nth-child(3) .stat-number {
  font-size: 5rem;
}

.stat-label {
  font-size: 1rem;
  color: var(--text-gray);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Projects Section - Immediately After Hero */
.projects {
  padding: var(--section-spacing) 0;
  background-color: #FAFAFA;
  border-top: 1px solid var(--border-gray);
  border-bottom: 1px solid var(--border-gray);
}


/* Clean 3-Column Equal Grid - Honest & Scalable */
.experiments-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  max-width: var(--container-main);
  margin: 0 auto;
}

.experiment-card {
  background-color: var(--pure-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: none;
  transition: all var(--transition-smooth);
  position: relative;
  opacity: 0;
  animation: fadeInUp 0.6s ease-out forwards;
  border: 3px solid var(--deep-black);
  display: flex;
  flex-direction: column;
  min-height: 280px;
}

/* Equal Treatment - BOLD Color Borders */
.experiment-card:nth-child(1) {
  border-color: var(--accent-cyan);
}

.experiment-card:nth-child(2) {
  border-color: var(--accent-blue);
}

.experiment-card:nth-child(3) {
  border-color: var(--accent-pink);
}

.experiment-card:nth-child(4) {
  border-color: var(--accent-gold);
}

.experiment-card:nth-child(5) {
  border-color: var(--accent-cyan);
}

.experiment-card:nth-child(6) {
  border-color: var(--accent-blue);
}

.experiment-card:nth-child(7) {
  border-color: var(--accent-pink);
}

.experiment-card:hover {
  transform: translateY(-6px);
  box-shadow: 8px 8px 0 var(--deep-black);
}

.experiment-card:nth-child(1):hover {
  box-shadow: 8px 8px 0 var(--accent-cyan);
}

.experiment-card:nth-child(2):hover {
  box-shadow: 8px 8px 0 var(--accent-blue);
}

.experiment-card:nth-child(3):hover {
  box-shadow: 8px 8px 0 var(--accent-pink);
}

.experiment-card:nth-child(4):hover {
  box-shadow: 8px 8px 0 var(--accent-gold);
}

.experiment-card:nth-child(5):hover {
  box-shadow: 8px 8px 0 var(--accent-cyan);
}

.experiment-card:nth-child(6):hover {
  box-shadow: 8px 8px 0 var(--accent-blue);
}

.experiment-card:nth-child(7):hover {
  box-shadow: 8px 8px 0 var(--accent-pink);
}

.card-doodle {
  position: relative;
  height: 80px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  flex-shrink: 0;
  border-radius: 0;
}

/* FULL SATURATION Color Blocks - Equal Height */
.experiment-card:nth-child(1) .card-doodle {
  background: var(--accent-cyan);
}

.experiment-card:nth-child(2) .card-doodle {
  background: var(--accent-blue);
}

.experiment-card:nth-child(3) .card-doodle {
  background: var(--accent-pink);
}

.experiment-card:nth-child(4) .card-doodle {
  background: var(--accent-gold);
}

.experiment-card:nth-child(5) .card-doodle {
  background: var(--accent-cyan);
}

.experiment-card:nth-child(6) .card-doodle {
  background: var(--accent-blue);
}

.experiment-card:nth-child(7) .card-doodle {
  background: var(--accent-pink);
}

/* Remove SVG icons entirely */
.card-doodle svg {
  display: none;
}

.card-content {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  background-color: var(--pure-white);
}

.card-title {
  font-size: 1.25rem;
  font-weight: var(--font-weight-bold);
  color: var(--deep-black);
  margin-bottom: 0.75rem;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.card-description {
  color: var(--text-gray);
  margin-bottom: 0.75rem;
  line-height: 1.5;
  font-size: 0.875rem;
  flex: 1;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  margin-bottom: 0.75rem;
}

/* Base tag styling */
.complexity-tag,
.category-tag {
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.6875rem;
  font-weight: var(--font-weight-semibold);
  border: 1px solid;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

/* Complexity Tags */
.complexity-beginner {
  background-color: #F0F9FF;
  color: #0369A1;
  border-color: #BAE6FD;
}

.complexity-intermediate {
  background-color: #FEFCE8;
  color: #A16207;
  border-color: #FEF08A;
}

.complexity-advanced {
  background-color: #FEF3F2;
  color: #B91C1C;
  border-color: #FECACA;
}

.complexity-expert {
  background-color: #F3F4F6;
  color: #374151;
  border-color: #D1D5DB;
}

/* Project Category Tags */
.category-ai-tools {
  background-color: #FEF3C7;
  color: #D97706;
  border-color: #FDE68A;
}

.category-logistics-\&-maps,
.category-logística-y-mapas {
  background-color: #DBEAFE;
  color: #1D4ED8;
  border-color: #93C5FD;
}

.category-finance-\/-ai-agents,
.category-finanzas-\/-agentes-ia {
  background-color: #F0FDF4;
  color: #15803D;
  border-color: #86EFAC;
}

.category-web-app {
  background-color: #ECFDF5;
  color: #059669;
  border-color: #A7F3D0;
}

.category-ai-ml {
  background-color: #F4F3FF;
  color: #6366F1;
  border-color: #C7D2FE;
}

.card-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.card-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: var(--font-weight-bold);
  text-decoration: none;
  transition: all var(--transition-smooth);
  min-width: 100px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.card-link.primary {
  background-color: var(--deep-black);
  color: var(--pure-white);
  border: 2px solid var(--deep-black);
}

.card-link.primary:hover {
  background-color: var(--accent-cyan);
  color: var(--deep-black);
  transform: translateY(-2px);
  box-shadow: 3px 3px 0 var(--deep-black);
}

.card-link:not(.primary) {
  background-color: var(--pure-white);
  color: var(--deep-black);
  border: 2px solid var(--deep-black);
}

.card-link:not(.primary):hover {
  background-color: var(--accent-cyan);
  color: var(--deep-black);
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
  box-shadow: 3px 3px 0 var(--deep-black);
}

/* Doodle Category Colors */
.doodle-nlp {
  color: var(--accent-pink);
  fill: var(--accent-pink);
}

.doodle-cv {
  color: var(--accent-blue);
  fill: var(--accent-blue);
}

.doodle-ml {
  color: var(--accent-cyan);
  fill: var(--accent-cyan);
}

.doodle-webapp {
  color: var(--accent-gold);
  fill: var(--accent-gold);
}

/* Contact Section - Single CTA Focus */
.contact {
  padding: 6rem 0;
  background-color: var(--pure-white);
  border-top: 1px solid var(--border-gray);
  border-bottom: none;
}

.contact .section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: var(--space-lg);
  font-weight: var(--font-weight-black);
  letter-spacing: -0.02em;
}

.contact .section-subtitle {
  font-size: clamp(1.125rem, 1.5vw, 1.25rem);
  line-height: 1.7;
  margin-bottom: var(--space-3xl);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
  font-weight: var(--font-weight-medium);
}

.contact-cta-center {
  display: flex;
  justify-content: center;
  margin-top: var(--space-xl);
}

/* Footer - Compact Bold Block */
.footer {
  padding: var(--space-xl) 0;
  background-color: var(--deep-black);
  color: var(--pure-white);
  border-top: 3px solid var(--accent-cyan);
}

.footer-content {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.footer-text {
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 0;
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
}

.footer-copy {
  color: rgba(255, 255, 255, 0.4);
  font-size: var(--font-size-small);
}

/* Loading Spinner */
.loading-spinner {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 1;
  visibility: visible;
  transition: all var(--transition-base);
}

.loading-spinner.hidden {
  opacity: 0;
  visibility: hidden;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border-color);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Experimental Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Responsive Design */
@media (max-width: 1024px) {
  .about-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }

  .about-stats {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .stat-number {
    font-size: 8rem !important;
  }

  .stat-item:nth-child(2) .stat-number,
  .stat-item:nth-child(3) .stat-number {
    font-size: 6rem !important;
  }

  /* 2 columns on tablet */
  .experiments-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }

  .experiment-card {
    min-height: 300px;
  }

  .card-doodle {
    height: 80px;
  }
}

@media (max-width: 768px) {
  :root {
    --section-spacing: 5rem;
    --content-spacing: var(--space-2xl);
  }

  html {
    font-size: 16px; /* Ensure 16px minimum on mobile */
  }

  /* Keep full-width navbar on mobile */
  .navbar {
    position: fixed;
    top: 0;
  }

  .nav-container {
    height: 64px;
    padding: 0 var(--space-lg);
  }

  .nav-logo .logo-link {
    font-size: 1.125rem;
  }

  .nav-list {
    flex-direction: column;
    gap: var(--space-xs);
  }

  .nav-toggle {
    display: none;
  }

  .language-selector {
    margin-top: var(--space-sm);
  }

  .hero {
    padding-top: var(--space-3xl);
    margin-top: 64px;
    min-height: 75vh;
  }

  .hero-title::after {
    width: 160px;
    height: 6px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn-md {
    width: 100%;
    max-width: 280px;
  }

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

  .about-stats {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .stat-number {
    font-size: 6rem !important;
  }

  .stat-item:nth-child(2) .stat-number,
  .stat-item:nth-child(3) .stat-number {
    font-size: 4rem !important;
  }

  /* Single column stack on mobile */
  .experiments-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .experiment-card {
    min-height: 280px;
  }

  .card-doodle {
    height: 80px;
  }

  .card-content {
    padding: 1.25rem;
  }

  .card-actions {
    flex-direction: column;
    gap: var(--space-sm);
  }

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

  .contact-links {
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
  }

  .contact-link {
    width: 100%;
    max-width: 300px;
    justify-content: center;
    min-height: 48px;
  }
}

/* Accessibility & Focus States */
*:focus {
  outline: none;
}

*:focus-visible {
  outline: 3px solid var(--accent-cyan);
  outline-offset: 3px;
}

.btn:focus-visible {
  outline: 3px solid var(--accent-cyan);
  outline-offset: 3px;
}

.btn-primary:focus-visible {
  outline: 3px solid var(--pure-white);
  outline-offset: 3px;
}

.contact-link:focus-visible,
.experiment-card:focus-within {
  outline: 3px solid var(--accent-cyan);
  outline-offset: 3px;
}

/* Skip link for keyboard navigation */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--deep-black);
  color: var(--pure-white);
  padding: var(--space-sm) var(--space-md);
  text-decoration: none;
  border-radius: var(--radius-md);
  z-index: 1000;
  font-weight: var(--font-weight-semibold);
}

.skip-link:focus {
  top: 6px;
  outline: 3px solid var(--pure-white);
  outline-offset: 2px;
}

@media (max-width: 480px) {
  :root {
    --section-spacing: 4rem;
  }

  .container,
  .container-narrow {
    padding: 0 var(--space-md);
  }

  .navbar {
    position: fixed;
  }

  .nav-container {
    padding: 0 var(--space-md);
    height: 56px;
  }

  .logo-img {
    height: 36px;
  }

  .hero {
    min-height: 65vh;
    padding: var(--space-xl) 0;
    margin-top: 56px;
  }

  /* Mobile typography adjustments */
  .hero-title {
    font-size: clamp(2.25rem, 11vw, 3.5rem);
    line-height: 1;
  }

  .hero-title::after {
    width: 120px;
    height: 5px;
  }

  .hero-subtitle {
    font-size: 1.125rem;
  }

  .hero-tagline {
    font-size: 0.9375rem;
  }

  .hero-actions {
    flex-direction: column;
    gap: var(--space-md);
    width: 100%;
  }

  .cta-primary-wrapper {
    width: 100%;
  }

  .cta-primary-wrapper .btn {
    width: 100%;
  }

  .btn-secondary {
    width: 100%;
  }

  .cta-time {
    font-size: 0.8125rem;
  }

  .buildlab {
    padding: 3rem 0;
  }

  .buildlab-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .buildlab-content {
    padding-right: 0;
  }

  .buildlab-title {
    font-size: clamp(1.5rem, 6vw, 2rem);
    margin-bottom: var(--space-sm);
  }

  .buildlab-subtitle {
    margin-bottom: var(--space-md);
  }

  .calendar-wrapper iframe {
    height: 450px;
    box-shadow: 4px 4px 0 var(--deep-black);
  }

  .calendar-wrapper iframe:hover {
    transform: none;
    box-shadow: 4px 4px 0 var(--deep-black);
  }

  .section-title {
    font-size: clamp(2rem, 9vw, 2.5rem);
  }

  .experiments-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .experiment-card {
    min-height: 260px;
  }

  .card-doodle {
    height: 70px;
  }

  .card-content {
    padding: 1rem;
  }

  .card-title {
    font-size: 1.125rem;
  }

  .about-stats {
    grid-template-columns: 1fr;
    gap: var(--space-md);
    max-width: 100%;
  }

  .contact {
    padding: 4rem 0;
  }

  .contact .section-title {
    font-size: clamp(1.75rem, 7vw, 2.25rem);
  }

  .contact .section-subtitle {
    font-size: 1rem;
    margin-bottom: var(--space-2xl);
  }

  .contact-cta-center {
    margin-top: var(--space-lg);
  }

  .stat-item {
    padding: var(--space-xl);
  }

  .contact-links {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .contact-link {
    width: 100%;
    max-width: 100%;
    justify-content: center;
    margin: 0;
    min-height: 52px;
  }

}