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

:root {
  --bg: #f9f8f6;
  --fg: #1a1a1a;
  --muted: #888;
  --accent: #1a1a1a;
  --card-bg: #ffffff;
  --border: #e8e6e1;
  --card-hover: #f3f2ef;
  --max-w: 680px;
  --track-bg: #d4d2cd;
  color-scheme: light;
}

html.dark {
  --bg: #141414;
  --fg: #e8e6e1;
  --muted: #666;
  --accent: #e8e6e1;
  --card-bg: #1e1e1e;
  --border: #2c2c2c;
  --card-hover: #252525;
  --track-bg: #3a3a3a;
  color-scheme: dark;
}

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

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'Georgia', serif;
  line-height: 1.7;
  padding: 0 1.5rem 4rem;
}

/* Nav */
nav {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 0.75rem;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1.5rem 0 0;
}

#lang-toggle {
  font-family: inherit;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  cursor: pointer;
  padding: 0.3rem 0.75rem;
  border-radius: 2px;
  transition: color 0.2s, border-color 0.2s;
}

#lang-toggle:hover {
  color: var(--fg);
  border-color: var(--fg);
}

/* Header */
header {
  max-width: var(--max-w);
  margin: 3.5rem auto 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}

.avatar {
  width: 162px;
  height: 162px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
}

h1 {
  font-size: 2rem;
  font-weight: normal;
  letter-spacing: -0.02em;
}

.tagline {
  color: var(--muted);
  font-size: 0.95rem;
  font-style: italic;
}

/* Sections */
section {
  max-width: var(--max-w);
  margin: 3.5rem auto 0;
}

section p {
  color: var(--fg);
  font-size: 1rem;
}

h2 {
  font-size: 0.75rem;
  font-family: 'Helvetica Neue', Arial, sans-serif;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: normal;
  margin-bottom: 1.5rem;
}

/* Project cards */
.project-grid {
  display: flex;
  flex-direction: column;
  gap: 1px;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.project-card {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  padding: 1.25rem 1.5rem;
  background: var(--card-bg);
  text-decoration: none;
  color: inherit;
  border-bottom: 1px solid var(--border);
  transition: background 0.15s;
}

.project-card:last-child {
  border-bottom: none;
}

.project-card:hover {
  background: var(--card-hover);
}

.project-icon {
  font-size: 1.25rem;
  line-height: 1.4;
  flex-shrink: 0;
}

.project-card h3 {
  font-size: 1rem;
  font-weight: normal;
  margin-bottom: 0.2rem;
}

.project-card p {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.5;
}

/* Contact form */
#contact p {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 1.75rem;
}

form {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

input, textarea {
  font-family: inherit;
  font-size: 0.95rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.75rem 1rem;
  color: var(--fg);
  transition: border-color 0.2s;
  width: 100%;
  resize: vertical;
}

input::placeholder, textarea::placeholder {
  color: var(--muted);
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--fg);
}

form button {
  align-self: flex-start;
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: var(--fg);
  color: var(--bg);
  border: none;
  padding: 0.75rem 1.75rem;
  border-radius: 3px;
  cursor: pointer;
  transition: opacity 0.2s;
}

form button:hover {
  opacity: 0.75;
}

/* Footer */
footer {
  max-width: var(--max-w);
  margin: 4rem auto 0;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--muted);
  font-family: 'Helvetica Neue', Arial, sans-serif;
}

/* Dark mode toggle switch */
.dark-toggle {
  display: inline-flex;
  align-items: center;
  cursor: pointer;
}

.dark-toggle input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.track {
  display: flex;
  align-items: center;
  width: 44px;
  height: 24px;
  background: var(--track-bg);
  border-radius: 999px;
  padding: 2px;
  transition: background 0.25s;
}

.thumb {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  background: var(--card-bg);
  border-radius: 50%;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
  transition: transform 0.25s;
  font-size: 11px;
  line-height: 1;
}

.dark-toggle input:checked ~ .track {
  background: #4a4a4a;
}

.dark-toggle input:checked ~ .track .thumb {
  transform: translateX(20px);
}

/* Responsive */
@media (max-width: 480px) {
  h1 { font-size: 1.6rem; }
  .project-card { padding: 1rem 1.25rem; }
}