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

html { 
  scroll-behavior: smooth; 
}

/* ── Design Tokens ── */
:root {
  --color-bg:       #0a0a0a;
  --color-surface:  #141414;
  --color-border:   #282828;
  --color-text:     #f5f5f5;
  --color-muted:    #888888;
  --color-accent:   #00d9ff;
  --color-accent-2: #7c3aed;

  --font-display:   'DM Serif Display', Georgia, serif;
  --font-body:      'Sora', -apple-system, system-ui, sans-serif;

  --radius-sm:  8px;
  --radius-md:  16px;
  --radius-lg:  24px;

  --space-xs:   0.25rem;
  --space-sm:   0.5rem;
  --space-md:   1rem;
  --space-lg:   2rem;
  --space-xl:   4rem;
  --space-2xl:  8rem;

  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow: 0 8px 32px rgba(0, 217, 255, 0.1);
  --shadow-hover: 0 12px 48px rgba(0, 217, 255, 0.2);
}

/* ── Base ── */
body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
  position: relative;
  overflow-x: hidden;
}

/* Background gradient effect */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 20% 50%, rgba(124, 58, 237, 0.08) 0%, transparent 50%),
              radial-gradient(circle at 80% 80%, rgba(0, 217, 255, 0.06) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

img, video, svg { 
  display: block; 
  max-width: 100%; 
}

a { 
  color: inherit; 
  text-decoration: none; 
}

button { 
  font: inherit; 
  cursor: pointer; 
  border: none; 
  background: none; 
}

ul, ol { 
  list-style: none; 
}

/* ── Typography Scale ── */
h1 { 
  font-family: var(--font-display); 
  font-size: clamp(2.5rem, 8vw, 6rem); 
  line-height: 1.05; 
  font-weight: 400;
  letter-spacing: -0.02em;
}

h2 { 
  font-family: var(--font-display); 
  font-size: clamp(2rem, 5vw, 3.5rem); 
  line-height: 1.15; 
  font-weight: 400;
  letter-spacing: -0.01em;
}

h3 { 
  font-family: var(--font-display); 
  font-size: clamp(1.5rem, 3vw, 2.25rem); 
  line-height: 1.3; 
  font-weight: 400; 
}

h4 { 
  font-size: 1.25rem; 
  font-weight: 600; 
  letter-spacing: 0.01em; 
}

p { 
  max-width: 65ch; 
}

small { 
  font-size: 0.875rem; 
  color: var(--color-muted); 
}

/* ── Layout Utilities ── */
.container { 
  width: min(1400px, 92vw); 
  margin-inline: auto; 
}

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

.flex { 
  display: flex; 
}

.flex-col { 
  flex-direction: column; 
}

.items-center { 
  align-items: center; 
}

.justify-between { 
  justify-content: space-between; 
}

.gap-sm { 
  gap: var(--space-sm); 
}

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

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

.gap-xl {
  gap: var(--space-xl);
}

.grid { 
  display: grid; 
}

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

.grid-3 { 
  grid-template-columns: repeat(3, 1fr); 
}

.grid-auto { 
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); 
}

.text-center { 
  text-align: center; 
}

.text-muted { 
  color: var(--color-muted); 
}

.accent { 
  color: var(--color-accent); 
}

/* ── Components ── */

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-2xl);
  backdrop-filter: blur(12px) saturate(180%);
  background: rgba(10, 10, 10, 0.8);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition);
}

.nav.scrolled {
  padding: var(--space-md);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.nav__logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav__links {
  display: flex;
  gap: var(--space-xl);
}

.nav__links a {
  font-size: 0.95rem;
  color: var(--color-muted);
  transition: color var(--transition);
  position: relative;
}

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

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

.nav__links a:hover::after,
.nav__links a.active::after {
  width: 100%;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 6rem;
}

.hero__content {
  max-width: 900px;
}

.hero__label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(0, 217, 255, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
  border: 1px solid rgba(0, 217, 255, 0.2);
  color: var(--color-accent);
  margin-bottom: var(--space-lg);
}

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

.hero__title .gradient {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__description {
  font-size: 1.15rem;
  line-height: 1.8;
  margin-bottom: var(--space-xl);
}

.hero__cta {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* Button */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 1rem 2rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  cursor: pointer;
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-2) 100%);
  color: var(--color-bg);
  box-shadow: 0 4px 16px rgba(0, 217, 255, 0.3);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 217, 255, 0.4);
}

.btn--outline {
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn--outline:hover {
  border-color: var(--color-accent);
  background: rgba(0, 217, 255, 0.05);
}

.btn--project { 
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-2) 100%); 
}

/* Social Links */
.social-links {
  display: flex;
  gap: var(--space-md);
}

.social-link {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  transition: all var(--transition);
}

.social-link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(0, 217, 255, 0.05);
  transform: translateY(-2px);
}

/* Project Card */
.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
  cursor: pointer;
  display: block;
  text-decoration: none;
  color: inherit;
  position: relative;
}

.project-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.project-card__image {
  width: 100%;
  aspect-ratio: 16/9;
  background: linear-gradient(135deg, rgba(0, 217, 255, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--color-muted);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition);
}

.project-card:hover .project-card__image {
  /* UUSI: Kuva kirkastuu hoverissa */
  background: linear-gradient(135deg, rgba(0, 217, 255, 0.15) 0%, rgba(124, 58, 237, 0.15) 100%);
}

.project-card__content {
  padding: var(--space-lg);
}

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

.project-card__tag {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  background: rgba(0, 217, 255, 0.1);
  color: var(--color-accent);
}

.project-card__title {
  font-size: 1.5rem;
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.project-card__link-icon {
  opacity: 0;
  transform: translate(-4px, 4px);
  transition: all var(--transition);
  color: var(--color-accent);
  flex-shrink: 0;
}

.project-card__demo-link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  margin-top: var(--space-md);
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  position: relative;
  z-index: 10; /* Tärkeä: nostaa linkin kortin päälle */
}

.project-card__demo-link:hover {
  background: var(--color-accent);
  color: var(--color-bg);
  transform: translateX(2px);
}

.project-card:hover .project-card__link-icon {
  opacity: 1;
  transform: translate(0, 0);
}

.project-card__description {
  color: var(--color-muted);
  line-height: 1.6;
}

/* Skill Badge */
.skill-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
}

.skill-badge:hover {
  border-color: var(--color-accent);
  background: rgba(0, 217, 255, 0.05);
  transform: translateY(-2px);
}

.skill-badge__icon {
  font-size: 1.25rem;
}

/* Section Header */
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-xl);
}

.section-header__label {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

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

/* Contact Section */
.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.contact-item:hover {
  border-color: var(--color-accent);
  background: rgba(0, 217, 255, 0.02);
}

.contact-item__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(0, 217, 255, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
  border-radius: var(--radius-sm);
  color: var(--color-accent);
  font-size: 1.5rem;
}

.contact-item__content h4 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.contact-item__content p {
  color: var(--color-muted);
  font-size: 0.95rem;
}

/* Footer */
footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) 0;
  margin-top: var(--space-2xl);
}

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

/* Divider */
.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-2xl) 0;
}

/* ── Animations ── */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

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

.animate-fade-up {
  animation: fadeUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) both;
}

.animate-fade-in {
  animation: fadeIn 0.6s ease both;
}

.animate-slide-in {
  animation: slideIn 0.7s ease both;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }

/* ── Responsive ── */
@media (max-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav__links {
    display: none;
  }
  
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
  
  .grid-auto {
    grid-template-columns: 1fr;
  }
  
  .hero {
    padding-top: 4rem;
    min-height: 90vh;
  }
  
  .hero__cta {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .footer-content {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }
  
  .section {
    padding-block: var(--space-xl);
  }
}

@media (max-width: 480px) {
  .container {
    width: 90vw;
  }
  
  .skill-badge {
    font-size: 0.85rem;
    padding: 0.6rem 1rem;
  }
}