:root,
[data-theme="dark"] {
  --color-body-bg: #2b2b2b;
  --color-header-bg: #2b2b2b;
  --color-surface: rgba(255, 255, 255, 0.06);
  --color-text: #f5f5f5;
  --color-text-muted: #a8a8a8;
  --color-border: #444444;
  --color-header-text: #ffffff;
  --color-header-text-muted: #a8a8a8;
  --color-icon-filter: brightness(0) invert(1);
}

[data-theme="light"] {
  --color-body-bg: #ffffff;
  --color-header-bg: #ffffff;
  --color-surface: rgba(255, 255, 255, 0.85);
  --color-text: #2b2b2b;
  --color-text-muted: #6e6e6e;
  --color-border: #d8d8d8;
  --color-header-text: #2b2b2b;
  --color-header-text-muted: #6e6e6e;
  --color-icon-filter: none;
}

:root {
  --font: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --header-height: 56px;
  --max-width: 640px;
  --transition: 0.2s ease;
}

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

html {
  scrollbar-gutter: stable;
  background: var(--color-body-bg);
}

body {
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-body-bg);
  transition: color var(--transition), background var(--transition);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: var(--color-header-bg);
  transition: background var(--transition);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav__link {
  font-size: 0.875rem;
  color: var(--color-header-text-muted);
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-header-text);
}

.theme-toggle {
  flex-shrink: 0;
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-header-text-muted);
  font: inherit;
  font-size: 0.875rem;
  line-height: 1;
  padding: 4px 8px;
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition);
}

.theme-toggle:hover {
  color: var(--color-header-text);
  border-color: var(--color-header-text-muted);
}

.main {
  flex: 1;
  padding-top: calc(var(--header-height) + 48px);
  padding-bottom: 48px;
}

.main:has(.page__back) {
  display: flex;
  flex-direction: column;
}

.main--home {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding-top: var(--header-height);
  padding-bottom: 0;
}

.intro {
  text-align: center;
}

.intro__title,
.page__title,
.article__title {
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.main--home .intro__title {
  font-size: 2rem;
  margin-bottom: 16px;
}

.page__title {
  margin-bottom: 24px;
}

.content p,
.article__content p {
  color: var(--color-text-muted);
  margin-bottom: 1em;
}

.intro__contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 0.875rem;
  font-weight: 500;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.intro__contact-btn:hover {
  background: var(--color-text);
  border-color: var(--color-text);
  color: var(--color-body-bg);
}

.intro__contact-icon {
  flex-shrink: 0;
  transition: filter var(--transition);
  filter: var(--color-icon-filter);
}

.intro__contact-btn:hover .intro__contact-icon {
  filter: brightness(0) invert(1);
}

[data-theme="dark"] .intro__contact-btn:hover .intro__contact-icon {
  filter: none;
}

.project-list {
  list-style: none;
  border-top: 1px solid var(--color-border);
}

.project {
  border-bottom: 1px solid var(--color-border);
}

.project__toggle {
  display: block;
  width: 100%;
  padding: 14px 0;
  border: none;
  background: none;
  font: inherit;
  text-align: left;
  color: var(--color-text);
  cursor: pointer;
}

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

.project__name {
  display: block;
  font-weight: 500;
  transition: color var(--transition);
}

.project__desc {
  display: block;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.project__details {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.25s ease;
}

.project.open .project__details {
  grid-template-rows: 1fr;
}

.project__details-inner {
  overflow: hidden;
}

.project__details-inner p {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  line-height: 1.7;
  padding-bottom: 14px;
}

.project__links {
  display: flex;
  gap: 16px;
  padding-bottom: 14px;
}

.text-link {
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.article__header {
  margin-bottom: 24px;
}

.article__title {
  margin-bottom: 8px;
}

.article__date {
  display: block;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.article__content h2 {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text);
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

.article__content ul {
  color: var(--color-text-muted);
  margin-bottom: 1em;
  padding-left: 1.25em;
}

.article__content li {
  margin-bottom: 0.35em;
}

.page__back {
  display: inline-block;
  margin-top: auto;
  padding-top: 64px;
}