/* ============================================ */
/* 1. CSS CUSTOM PROPERTIES (Design Tokens)     */
/* ============================================ */
:root {
  /* Colors */
  --color-primary: #4F46E5;
  --color-primary-light: #818CF8;
  --color-primary-dark: #3730A3;
  --color-accent: #F97316;
  --color-accent-warm: #FBBF24;
  --color-teal: #14B8A6;
  --color-green: #22C55E;
  --color-pink: #EC4899;
  --color-ski: #0EA5E9;
  --color-strava: #FC4C02;
  --color-surface: #F8FAFC;
  --color-card: #FFFFFF;
  --color-text: #0F172A;
  --color-text-secondary: #64748B;
  --color-border: #E2E8F0;
  --color-footer: #1E293B;
  --color-linkedin: #0077B5;
  --color-github: #1E293B;
  --color-email: #F97316;

  /* Typography */
  --font-heading: 'Plus Jakarta Sans', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 5rem;

  /* Borders */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;

  /* Layout */
  --max-width: 1200px;
  --content-width: 900px;
}

/* ============================================ */
/* 2. CSS RESET / BASE                          */
/* ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul {
  list-style: none;
}

/* ============================================ */
/* 3. TYPOGRAPHY                                */
/* ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.3;
  color: var(--color-text);
}

h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
}

h2 {
  font-size: 2rem;
  font-weight: 700;
}

h3 {
  font-size: 1.25rem;
  font-weight: 700;
}

p {
  margin-bottom: 1rem;
}

p:last-child {
  margin-bottom: 0;
}

small, .text-small {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* ============================================ */
/* 4. LAYOUT UTILITIES                          */
/* ============================================ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container--narrow {
  max-width: var(--content-width);
}

.section {
  padding: var(--space-2xl) 0;
}

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

.section-header h2 {
  display: inline-block;
  position: relative;
  padding-bottom: var(--space-sm);
}

.section-header h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
}

.section-header p {
  color: var(--color-text-secondary);
  margin-top: var(--space-md);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================ */
/* 5. NAVIGATION                                */
/* ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-md) 0;
  transition: background-color var(--transition-normal), box-shadow var(--transition-normal);
}

.navbar--scrolled {
  background-color: var(--color-card);
  box-shadow: var(--shadow-sm);
}

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

.navbar__brand {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  color: white;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.navbar--scrolled .navbar__brand {
  color: var(--color-text);
}

.navbar__links {
  display: flex;
  gap: var(--space-lg);
}

.navbar__links a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
}

.navbar__links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-normal);
  border-radius: var(--radius-full);
}

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

.navbar--scrolled .navbar__links a {
  color: var(--color-text);
}

.navbar--scrolled .navbar__links a:hover {
  color: var(--color-primary);
}

/* Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: white;
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
}

.navbar--scrolled .hamburger span {
  background-color: var(--color-text);
}

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

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

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

/* Interior page nav (non-fixed) */
.navbar--interior {
  position: relative;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
}

.navbar--interior .navbar__brand {
  color: white;
}

.navbar--interior .navbar__links a {
  color: rgba(255, 255, 255, 0.9);
}

.navbar--interior .navbar__links a:hover {
  color: white;
}

.navbar--interior .hamburger span {
  background-color: white;
}

/* ============================================ */
/* 6. HERO SECTION                              */
/* ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  position: relative;
  overflow: hidden;
  padding: var(--space-2xl) 0;
}

.hero__content {
  text-align: center;
  color: white;
  position: relative;
  z-index: 1;
}

.hero__photo {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  border: 5px solid rgba(255, 255, 255, 0.3);
  box-shadow: var(--shadow-xl);
  margin: 0 auto var(--space-lg);
  transition: transform var(--transition-normal);
}

.hero__photo:hover {
  transform: scale(1.05);
}

.hero__title {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: var(--space-sm);
  color: white;
}

.hero__subtitle {
  font-size: 1.25rem;
  font-weight: 400;
  opacity: 0.9;
  margin-bottom: var(--space-xl);
}

.hero__buttons {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* Decorative circles */
.hero::before,
.hero::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  opacity: 0.1;
}

.hero::before {
  width: 400px;
  height: 400px;
  background: white;
  top: -100px;
  right: -100px;
}

.hero::after {
  width: 300px;
  height: 300px;
  background: white;
  bottom: -50px;
  left: -50px;
}

/* Scroll indicator */
.hero__scroll {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
  color: white;
  opacity: 0.7;
  font-size: 1.5rem;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  40% {
    transform: translateX(-50%) translateY(-10px);
  }
  60% {
    transform: translateX(-50%) translateY(-5px);
  }
}

/* Project detail hero (shorter) */
.hero--project {
  min-height: auto;
  padding: 120px 0 60px;
}

.hero--project .hero__title {
  font-size: 2.5rem;
}

.hero--about {
  min-height: auto;
  padding: 80px 0 60px;
}

/* ============================================ */
/* 7. ABOUT SECTION                             */
/* ============================================ */
.about-card {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
  max-width: var(--content-width);
  margin: 0 auto;
}

.about-card p {
  color: var(--color-text-secondary);
  font-size: 1.125rem;
  line-height: 1.8;
}

.about-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-primary);
  font-weight: 600;
  margin-top: var(--space-md);
  transition: gap var(--transition-fast);
}

.about-link:hover {
  gap: var(--space-md);
  color: var(--color-primary-dark);
}

/* ============================================ */
/* 8. PROJECT CARDS                             */
/* ============================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.project-card {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  display: flex;
  flex-direction: column;
  border-top: 4px solid var(--color-primary);
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.project-card--teal {
  border-top-color: var(--color-teal);
}

.project-card--coral {
  border-top-color: var(--color-accent);
}

.project-card--green {
  border-top-color: var(--color-green);
}

.project-card--ski {
  border-top-color: var(--color-ski);
}

.project-card--strava {
  border-top-color: var(--color-strava);
}

.project-card--coros {
  border-top-color: var(--color-teal);
}

.project-card--hevy {
  border-top-color: var(--color-accent);
}

.project-card--rx {
  border-top-color: #7C3AED;
}

.project-card--ocean {
  border-top-color: #0E7490;
}

.project-card__body {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  flex: 1;
}

.project-card__icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-md);
}

.project-card__title {
  margin-bottom: var(--space-sm);
}

.project-card__title a {
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.project-card__desc {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  flex: 1;
  margin-bottom: var(--space-md);
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.project-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--color-primary);
  transition: gap var(--transition-fast);
}

.project-card__link:hover {
  gap: var(--space-md);
}

/* ============================================ */
/* 9. PROJECT DETAIL PAGE                       */
/* ============================================ */
.project-content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
}

.project-content h2 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-border);
}

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

.project-content ul {
  list-style: disc;
  padding-left: var(--space-lg);
  margin-bottom: var(--space-md);
}

.project-content li {
  margin-bottom: var(--space-sm);
  color: var(--color-text-secondary);
}

.project-content li strong {
  color: var(--color-text);
}

.project-content p {
  color: var(--color-text-secondary);
}

.project-content img {
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  margin: var(--space-lg) 0;
}

.project-content a {
  color: var(--color-primary);
  font-weight: 500;
}

.project-content a:hover {
  text-decoration: underline;
}

/* Code blocks */
.project-content pre {
  background: var(--color-footer);
  color: #E2E8F0;
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  overflow-x: auto;
  margin: var(--space-lg) 0;
  border-left: 4px solid var(--color-primary-light);
  font-size: 0.875rem;
  line-height: 1.6;
}

.project-content code {
  font-family: 'Fira Code', 'Source Code Pro', monospace;
}

.project-content pre code {
  background: none;
  padding: 0;
  font-size: inherit;
}

/* Inline code */
.project-content p code,
.project-content li code {
  background: var(--color-surface);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}

/* Callout box */
.callout {
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.05), rgba(129, 140, 248, 0.05));
  border: 1px solid rgba(79, 70, 229, 0.15);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin: var(--space-lg) 0;
}

.callout p {
  margin: 0;
  color: var(--color-text);
}

/* Back link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-text-secondary);
  font-weight: 500;
  margin-bottom: var(--space-lg);
  transition: color var(--transition-fast);
}

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

/* ============================================ */
/* 10. SKILLS SECTION                           */
/* ============================================ */
.skills-category {
  margin-bottom: var(--space-xl);
}

.skills-category:last-child {
  margin-bottom: 0;
}

.skills-category h3 {
  text-align: center;
  margin-bottom: var(--space-md);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--space-md);
  max-width: 800px;
  margin: 0 auto;
}

.skill-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--color-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  text-align: center;
}

.skill-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.skill-card i {
  font-size: 1.75rem;
  color: var(--color-primary);
}

.skill-card--teal i { color: var(--color-teal); }
.skill-card--coral i { color: var(--color-accent); }
.skill-card--green i { color: var(--color-green); }
.skill-card--pink i { color: var(--color-pink); }

.skill-card span {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text);
}

/* ============================================ */
/* 11. CONTACT SECTION                          */
/* ============================================ */
.contact-buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  color: white;
  font-size: 1rem;
  font-weight: 600;
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.contact-btn:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  color: white;
}

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

.contact-btn--linkedin {
  background-color: var(--color-linkedin);
}

.contact-btn--github {
  background-color: var(--color-github);
}

.contact-btn--email {
  background-color: var(--color-email);
}

/* ============================================ */
/* 12. TECHNOLOGY TAGS                          */
/* ============================================ */
.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  transition: transform var(--transition-fast);
}

.tag:hover {
  transform: scale(1.05);
}

/* Tag color variants */
.tag--python { background: var(--color-teal); color: white; }
.tag--pandas { background: #1D4ED8; color: white; }
.tag--numpy { background: #4F46E5; color: white; }
.tag--statsmodels { background: var(--color-primary-light); color: white; }
.tag--dataviz { background: var(--color-pink); color: white; }
.tag--jupyter { background: var(--color-accent); color: white; }
.tag--tableau { background: var(--color-accent); color: white; }
.tag--dashboard { background: #6366F1; color: white; }
.tag--kpi { background: var(--color-accent-warm); color: var(--color-text); }
.tag--selenium { background: var(--color-green); color: white; }
.tag--beautifulsoup { background: #059669; color: white; }
.tag--webscraping { background: #0D9488; color: white; }
.tag--automation { background: var(--color-primary-dark); color: white; }
.tag--regression { background: #7C3AED; color: white; }
.tag--sql { background: var(--color-primary); color: white; }
.tag--r { background: #2563EB; color: white; }
.tag--html { background: #E34F26; color: white; }
.tag--css { background: #1572B6; color: white; }
.tag--datascience { background: var(--color-pink); color: white; }
.tag--webdev { background: var(--color-primary-light); color: white; }
.tag--chartjs { background: #FF6384; color: white; }
.tag--api { background: var(--color-ski); color: white; }
.tag--javascript { background: #F7DF1E; color: var(--color-text); }
.tag--strava { background: var(--color-strava); color: white; }
.tag--actions { background: #2088FF; color: white; }
.tag--looker { background: #0E7490; color: white; }
.tag--sheets { background: #0F9D58; color: white; }
.tag--lean { background: #7C3AED; color: white; }
.tag--bsc { background: #6366F1; color: white; }

/* White variant for hero sections */
.tag--white {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  backdrop-filter: blur(4px);
}

/* ============================================ */
/* 13. BUTTONS                                  */
/* ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn--primary:hover {
  background-color: #EA580C;
  color: white;
}

.btn--outline {
  background: transparent;
  color: white;
  border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn--outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: white;
  color: white;
}

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

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

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

.btn--github:hover {
  background: #111827;
  color: white;
}

/* ============================================ */
/* 14. FOOTER                                   */
/* ============================================ */
.footer {
  background-color: var(--color-footer);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--space-xl) 0 var(--space-lg);
}

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

.footer__brand {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.125rem;
  color: white;
}

.footer__links {
  display: flex;
  gap: var(--space-lg);
}

.footer__links a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.footer__links a:hover {
  color: white;
}

.footer__copy {
  width: 100%;
  text-align: center;
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.875rem;
}

/* ============================================ */
/* 15. ANIMATIONS                               */
/* ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Hero entrance animations */
.hero__photo {
  animation: fadeInDown 0.8s ease forwards;
}

.hero__title {
  animation: fadeInUp 0.8s ease 0.2s forwards;
  opacity: 0;
}

.hero__subtitle {
  animation: fadeInUp 0.8s ease 0.4s forwards;
  opacity: 0;
}

.hero__buttons {
  animation: fadeInUp 0.8s ease 0.6s forwards;
  opacity: 0;
}

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

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================ */
/* 16. SKI TRACKER CHARTS                       */
/* ============================================ */
.ski-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
  margin: var(--space-lg) 0;
}

.ski-stat-card {
  background: var(--color-card);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
  border-top: 3px solid var(--color-ski);
}

.ski-stat-card__icon {
  font-size: 1.5rem;
  margin-bottom: var(--space-sm);
}

.ski-stat-card__value {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-text);
  line-height: 1.2;
}

.ski-stat-card__label {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-xs);
}

.chart-container {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  margin: var(--space-lg) 0;
}

.chart-container h3 {
  margin-bottom: var(--space-md);
  text-align: center;
}

.chart-container canvas {
  max-height: 400px;
}

.chart-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  margin: var(--space-lg) 0;
}

.chart-row .chart-container {
  margin: 0;
}

/* ============================================ */
/* 16b. STRAVA DASHBOARD                        */
/* ============================================ */
.strava-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
  margin: var(--space-lg) 0;
}

.strava-stat-card {
  background: var(--color-card);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
  border-top: 3px solid var(--color-strava);
}

.strava-stat-card__icon {
  font-size: 1.5rem;
  margin-bottom: var(--space-sm);
}

.strava-stat-card__value {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-text);
  line-height: 1.2;
}

.strava-stat-card__label {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-xs);
}

/* ============================================ */
/* 17. RESPONSIVE - TABLET (max-width: 1024px)  */
/* ============================================ */
@media (max-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  h1, .hero__title {
    font-size: 2.5rem;
  }

  .hero__photo {
    width: 180px;
    height: 180px;
  }
}

/* ============================================ */
/* 17. RESPONSIVE - MOBILE (max-width: 768px)   */
/* ============================================ */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .navbar__links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--color-card);
    flex-direction: column;
    padding: 80px var(--space-lg) var(--space-lg);
    box-shadow: var(--shadow-xl);
    transition: right var(--transition-normal);
  }

  .navbar__links.active {
    right: 0;
  }

  .navbar__links a {
    color: var(--color-text) !important;
    font-size: 1.125rem;
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border);
  }

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

  h1, .hero__title {
    font-size: 2rem;
  }

  .hero__subtitle {
    font-size: 1rem;
  }

  .hero__photo {
    width: 150px;
    height: 150px;
  }

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

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

  .contact-buttons {
    flex-direction: column;
    align-items: center;
  }

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

  .footer__links {
    justify-content: center;
  }

  .hero--project .hero__title {
    font-size: 1.75rem;
  }

  .skills-grid {
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  }

  .chart-row {
    grid-template-columns: 1fr;
  }

  .ski-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .strava-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================================ */
/* 18. RESPONSIVE - SMALL MOBILE (max-width: 480px) */
/* ============================================ */
@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-md);
  }

  h1, .hero__title {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .about-card {
    padding: var(--space-lg);
  }

  .project-card__body {
    padding: var(--space-md);
  }

  .project-content {
    padding: var(--space-xl) var(--space-md);
  }

  .ski-stats {
    grid-template-columns: 1fr;
  }

  .ski-stat-card__value {
    font-size: 1.5rem;
  }

  .strava-stats {
    grid-template-columns: 1fr;
  }

  .strava-stat-card__value {
    font-size: 1.5rem;
  }
}

/* ============================================ */
/* 19. REDUCED MOTION                           */
/* ============================================ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .fade-in {
    opacity: 1;
    transform: none;
  }
}

/* ============================================ */
/* 20. BIOGRAPHY SECTION (About page)           */
/* ============================================ */
.bio-section {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--space-lg);
}

.bio-section h2 {
  margin-bottom: var(--space-md);
}

.bio-section p {
  color: var(--color-text-secondary);
  font-size: 1.0625rem;
  line-height: 1.8;
}