/* ===== Design tokens ===== */
:root {
  --font-sans: 'Outfit', system-ui, sans-serif;
  --font-serif: 'Instrument Serif', Georgia, serif;
  --color-bg: #0f0f0f;
  --color-bg-elevated: #1a1a1a;
  --color-surface: #242424;
  --color-text: #f5f5f5;
  --color-text-muted: #a3a3a3;
  --color-accent: #e07a5f;
  --color-accent-hover: #e8917a;
  --color-border: #2e2e2e;
  --radius: 12px;
  --radius-lg: 20px;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --transition: 0.25s ease;
  --container: min(1200px, 100% - 2rem);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

/* ===== Layout ===== */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-lg) 0;
  background: transparent;
  transition: background var(--transition);
}

.header.scrolled {
  background: rgba(15, 15, 15, 0.9);
  backdrop-filter: blur(12px);
}

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

.logo {
  font-weight: 600;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
}

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

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--color-text);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

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

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

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

.btn-secondary:hover {
  background: var(--color-border);
}

.btn-full {
  width: 100%;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  padding: var(--space-xl) 0 var(--space-2xl);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(224, 122, 95, 0.15), transparent),
    radial-gradient(ellipse 60% 40% at 100% 50%, rgba(129, 178, 154, 0.08), transparent);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-label {
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  margin-bottom: var(--space-lg);
  opacity: 0;
  animation: fadeUp 0.8s ease forwards;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-xl);
}

.hero-title .line {
  display: block;
  opacity: 0;
  animation: fadeUp 0.8s ease forwards;
}

.hero-title .line:nth-child(1) { animation-delay: 0.1s; }
.hero-title .line:nth-child(2) { animation-delay: 0.2s; }
.hero-title .line:nth-child(3) { animation-delay: 0.3s; }

.hero-desc {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 480px;
  margin-bottom: var(--space-2xl);
  opacity: 0;
  animation: fadeUp 0.8s ease 0.4s forwards;
}

.hero-cta {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.5s forwards;
}

.hero-scroll {
  position: absolute;
  bottom: var(--space-2xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--color-border), transparent);
  border-radius: 2px;
  animation: scrollPulse 2s ease-in-out infinite;
}

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

@keyframes scrollPulse {
  0%, 100% { opacity: 0.5; transform: scaleY(0.8); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* ===== Section common ===== */
.section-label {
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  margin-bottom: var(--space-xl);
  letter-spacing: -0.02em;
}

/* ===== About ===== */
.about {
  padding: var(--space-2xl) 0 var(--space-4xl);
  background: var(--color-bg-elevated);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-4xl);
  align-items: center;
}

.about-image-frame {
  aspect-ratio: 4/5;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  background: var(--color-surface);
}

.about-image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.about-text {
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
  max-width: 56ch;
}

.about-skills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
}

.about-skills li {
  padding: var(--space-sm) var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ===== Portfolio ===== */
.portfolio {
  padding: var(--space-4xl) 0;
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
}

.portfolio-item {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  transition: transform var(--transition), border-color var(--transition);
}

.portfolio-item:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
}

.portfolio-image {
  aspect-ratio: 4/3;
  overflow: hidden;
}

.portfolio-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--transition);
}

.portfolio-item:hover .portfolio-image img {
  transform: scale(1.05);
}

.portfolio-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--accent, var(--color-surface)) 0%, var(--color-surface) 100%);
  opacity: 0.9;
  transition: transform var(--transition);
}

.portfolio-item:hover .portfolio-placeholder {
  transform: scale(1.05);
}

.portfolio-info {
  padding: var(--space-lg);
}

.portfolio-category {
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

.portfolio-info h4 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.portfolio-info p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ===== Contact ===== */
.contact {
  padding: var(--space-4xl) 0;
  background: var(--color-bg-elevated);
}

.contact-wrapper {
  max-width: 640px;
}

.contact-intro {
  margin-bottom: var(--space-2xl);
}

.contact-intro p {
  color: var(--color-text-muted);
  margin-top: var(--space-md);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color var(--transition);
  resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-muted);
  opacity: 0.7;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

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

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

.footer p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

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

.footer-links a {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--color-accent);
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
  }

  .about-image {
    max-width: 400px;
    margin-inline: auto;
  }

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

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    background: var(--color-bg-elevated);
    border-left: 1px solid var(--color-border);
    flex-direction: column;
    padding: var(--space-4xl) var(--space-xl);
    gap: var(--space-lg);
    transform: translateX(100%);
    transition: transform var(--transition);
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .hero-cta {
    flex-direction: column;
  }

  .hero-cta .btn {
    width: 100%;
  }

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

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

@media (max-width: 480px) {
  :root {
    --container: 100% - 1.5rem;
  }

  .hero-title {
    font-size: 2.5rem;
  }
}