:root {
  --color-primary: #2563eb;
  --color-link: #0000ee;
  --color-link-visited: #551a8b;
  --color-secondary: #64748b;
  --color-bg: #f0f0f0;
  --color-surface: #ffffff;
  --color-text: #000000;
  --color-text-muted: #333333;
  --color-accent: #000080;
  --color-success: #006400;
  --color-warning: #b8860b;
  --color-danger: #8b0000;
  --color-planned: #333333;
  --color-border: #333333;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 24px;

  --font-base: system-ui, -apple-system, 'MS Sans Serif', 'Courier New', monospace;
  --font-mono: 'Courier New', 'SF Mono', Monaco, 'Cascadia Code', monospace;
  --font-size-sm: 0.8rem;
  --font-size-base: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.563rem;
  --font-size-2xl: 1.953rem;
  --font-size-3xl: 2.441rem;

  --line-height-body: 1.5;
  --line-height-heading: 1.2;
}

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

html {
  scroll-behavior: smooth;
}

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

a {
  color: var(--color-link);
  text-decoration: underline;
}

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

a:visited {
  color: var(--color-link-visited);
}

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

ul {
  list-style: none;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-primary);
  color: #fff;
  z-index: 1000;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
}

/* === GLOBAL CONTAINER === */
.page-container {
  width: min(1100px, calc(100% - 48px));
  margin-inline: auto;
}

/* === HEADER (full-width bg, centered content) === */
.header {
  width: 100%;
  background: var(--color-surface);
  border-bottom: 2px solid var(--color-border);
}

.header .nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  padding: var(--space-sm) 0;
  position: relative;
}

/* === NAVBAR (retro, rectangular, persistent) === */
.nav__logo {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 1px;
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: 1px solid var(--color-border);
  cursor: pointer;
  padding: var(--space-xs);
}

.nav__toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
}

.nav__link {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  font-weight: 700;
  border-radius: 0;
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
}

.nav__link:hover {
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
}

.nav__link--active {
  background: var(--color-primary);
  color: #fff;
}

/* === LANGUAGE SWITCHER === */
.lang-switcher {
  position: relative;
  margin-left: var(--space-lg);
  display: flex;
  gap: var(--space-xs);
  align-items: center;
}

.lang-switcher__option {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  font-weight: 700;
  cursor: pointer;
  border-radius: 0;
}

.lang-switcher__option.is-active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.lang-switcher__option input {
  accent-color: var(--color-primary);
  margin: 0;
}

/* === MAIN (global container seam) === */
#main {
  width: min(1100px, calc(100% - 48px));
  margin-inline: auto;
  padding: var(--space-xl) 0;
}

#main > * {
  margin-bottom: var(--space-xl);
}

#main > *:last-child {
  margin-bottom: 0;
}

.home-content > * {
  margin-bottom: var(--space-xl);
}

.home-content > *:last-child {
  margin-bottom: 0;
}

/* === FOOTER (full-width bg, centered content) === */
.footer {
  width: 100%;
  background: var(--color-surface);
  border-top: 2px solid var(--color-border);
  margin-top: var(--space-xl);
}

.footer__copy {
  width: min(1100px, calc(100% - 48px));
  margin-inline: auto;
  padding: var(--space-lg) 0;
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* === HERO === */
.hero,
.hero--page {
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: 0;
}

.hero--page {
  padding: 40px var(--space-lg) var(--space-xl);
}

.hero__name {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.hero--page .hero__name {
  font-size: var(--font-size-2xl);
}

.hero__title {
  color: var(--color-text-muted);
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-sm);
}

.hero__description {
  color: var(--color-text-muted);
  font-size: var(--font-size-base);
  max-width: 600px;
  margin: 0 auto var(--space-lg);
}

.hero--page .hero__description {
  margin: 0 auto;
}

.hero__focus {
  color: var(--color-accent);
  font-weight: 700;
  font-size: var(--font-size-md);
  margin-top: var(--space-md);
}

.hero__actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  margin-top: var(--space-lg);
  flex-wrap: wrap;
}

.hero__picture,
.hero__img {
  display: none;
}

/* === MISSION === */
.mission {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: 0;
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
}

.mission__title {
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.mission__description {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-md);
}

.mission__meta {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* === TECH FOCUS === */
.tech-focus {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: 0;
  padding: var(--space-lg) var(--space-md);
}

.tech-focus__title {
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.tech-focus__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

/* === PROGRESS BAR (retro ASCII) === */
.progress-bar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin: var(--space-md) 0;
  font-family: var(--font-mono);
}

.progress-bar__fill {
  display: none;
}

.progress-bar__text {
  font-weight: 700;
  color: var(--color-text);
}

/* === STATUS BADGE (flat) === */
.status-badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-text);
  border-radius: 0;
}

.status--completed {
  border-color: var(--color-success);
  color: var(--color-success);
}

.status--in-progress {
  border-color: var(--color-warning);
  color: var(--color-warning);
}

.status--planned {
  border-color: var(--color-border);
  color: var(--color-planned);
}

/* === TECH / CONCEPT BADGES (flat) === */
.tech-badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  font-weight: 700;
  border-radius: 0;
  margin-right: var(--space-xs);
}

.concept-badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  background: #e0e0e0;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  border-radius: 0;
  margin-right: var(--space-xs);
}

/* === BUTTONS (retro, rectangular) === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-md);
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  border-radius: 0;
  transition: background 0.2s, color 0.2s;
}

.btn:hover {
  background: #e0e0e0;
  text-decoration: none;
}

.btn:active {
  background: #d0d0d0;
}

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

.btn--primary:hover {
  background: #1d4ed8;
}

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

.btn--secondary:hover {
  background: #e8eefc;
}

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn--ghost:hover {
  background: #e0e0e0;
}

/* === LINKS === */
.link {
  color: var(--color-link);
  text-decoration: underline;
  font-weight: 500;
}

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

.link--inline {
  font-size: var(--font-size-sm);
}

/* === RECENT LEARNING === */
.recent-learning__header,
.featured-projects__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
}

.recent-learning__title,
.featured-projects__title {
  color: var(--color-primary);
  margin-bottom: 0;
}

.learning-entry {
  padding: var(--space-md);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: 0;
  margin-bottom: var(--space-md);
}

.learning-entry__date {
  color: var(--color-primary);
  font-weight: 700;
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-xs);
}

.learning-entry__title {
  color: var(--color-text);
  margin-bottom: var(--space-sm);
  font-size: var(--font-size-md);
}

.learning-entry__desc {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-sm);
}

.learning-entry__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.tag {
  color: var(--color-accent);
  font-weight: 700;
  font-size: var(--font-size-sm);
}

/* === FEATURED PROJECTS / PROJECT CARDS === */
.featured-projects__grid {
  display: grid;
  gap: var(--space-lg);
}

@media (min-width: 768px) {
  .featured-projects__grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }
}

.project-card {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: 0;
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s;
}

.project-card:hover {
  border-color: var(--color-primary);
}

.project-card__header {
  padding: var(--space-md);
  border-bottom: 1px solid #999999;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-sm);
}

.project-card__title {
  margin-bottom: 0;
  color: var(--color-text);
}

.project-card__desc {
  padding: var(--space-md) var(--space-md) 0;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  flex: 1;
  margin-top: var(--space-sm);
}

.project-card__meta {
  padding: 0 var(--space-md) var(--space-md);
}

.project-card__techs,
.project-card__concepts {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
}

.project-card__footer {
  padding: var(--space-md);
  border-top: 1px solid #999999;
  display: flex;
  gap: var(--space-sm);
}

/* === REPOSITORY CARDS (About page) === */
.repos-grid {
  display: grid;
  gap: var(--space-lg);
}

@media (min-width: 768px) {
  .repos-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }
}

.repo-card {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: 0;
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s;
}

.repo-card:hover {
  border-color: var(--color-primary);
}

.repo-card__header {
  padding: var(--space-md);
  border-bottom: 1px solid #999999;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-sm);
}

.repo-card__title {
  margin-bottom: 0;
  color: var(--color-text);
}

.repo-card__desc {
  padding: var(--space-md) var(--space-md) 0;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  flex: 1;
  margin-top: var(--space-sm);
}

.repo-card__meta {
  padding: 0 var(--space-md) var(--space-md);
}

.repo-card__techs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
}

.repo-card__footer {
  padding: var(--space-md);
  border-top: 1px solid #999999;
  display: flex;
  gap: var(--space-sm);
}

/* === CONTRIBUTION CARDS (About page - Open Source) === */
.contributions-grid {
  display: grid;
  gap: var(--space-lg);
}

@media (min-width: 768px) {
  .contributions-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }
}

.contribution-card {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: 0;
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s;
}

.contribution-card:hover {
  border-color: var(--color-primary);
}

.contribution-card__header {
  padding: var(--space-md);
  border-bottom: 1px solid #999999;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-sm);
}

.contribution-card__title {
  margin-bottom: 0;
  color: var(--color-text);
}

.contribution-card__type {
  background: #e0e0e0;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  padding: var(--space-xs) var(--space-sm);
  border-radius: 0;
  margin-bottom: var(--space-sm);
}

.contribution-card__desc {
  padding: var(--space-md) var(--space-md) 0;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  flex: 1;
  margin-top: var(--space-sm);
}

.contribution-card__meta {
  padding: 0 var(--space-md) var(--space-md);
}

.contribution-card__technologies {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
}

/* === PERBAIKAN DI BAGIAN INI === */
.contribution-card__notable {
  margin-top: var(--space-md);
  padding: 0 var(--space-md); /* Memberikan jarak konsisten di kiri dan kanan */
}

.contribution-card__notable-title {
  margin: 0 0 var(--space-xs) 0;
  color: var(--color-text);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.contribution-card__notable-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.contribution-card__notable-list li {
  padding: var(--space-sm) 0; /* Padding vertikal tanpa padding horizontal berlebih */
  border-bottom: 1px solid #eeeeee;
  text-align: left;
}

.contribution-card__notable-list li:last-child {
  border-bottom: none;
}

.contribution-card__footer {
  padding: var(--space-md);
  border-top: 1px solid #999999;
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-md); /* Menjaga jarak footer dengan konten di atasnya */
}

/* === PROJECTS GRID === */
.projects-grid {
  display: grid;
  gap: var(--space-lg);
}

@media (min-width: 768px) {
  .projects-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }
}

/* === ROADMAP === */
.roadmap-tabs {
  display: flex;
  gap: var(--space-sm);
  margin: var(--space-xl) 0;
  border-bottom: 2px solid var(--color-border);
}

.roadmap-tab {
  padding: var(--space-sm) var(--space-md);
  background: transparent;
  border: 2px solid var(--color-border);
  border-bottom: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: var(--font-size-base);
  font-weight: 700;
  border-radius: 0;
  transition: background 0.2s, color 0.2s;
}

.roadmap-tab--active {
  color: var(--color-primary);
  background: var(--color-surface);
  border-color: var(--color-primary);
}

.roadmap-tab:hover:not(.roadmap-tab--active) {
  background: #e0e0e0;
}

.roadmap-panels {
  margin-top: var(--space-xl);
}

.roadmap-panel {
  display: none;
}

.roadmap-panel--active {
  display: block;
}

.roadmap-category {
  margin: var(--space-xl) 0;
}

.roadmap-category__title {
  color: var(--color-secondary);
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-md);
}

.roadmap-category__list {
  list-style: none;
  padding: 0;
}

.roadmap-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 0;
  margin-bottom: var(--space-sm);
}

.roadmap-item__status {
  font-weight: 700;
  min-width: 24px;
  text-align: center;
}

.roadmap-item__title {
  flex: 1;
}

.roadmap-icon {
  font-weight: 700;
}

.roadmap-icon--completed {
  color: var(--color-success);
}

.roadmap-icon--in-progress {
  color: var(--color-warning);
}

.roadmap-icon--planned {
  color: var(--color-planned);
}

/* === LEARNING LOG === */
.learning-month__title {
  color: var(--color-primary);
  margin: var(--space-xl) 0 var(--space-md);
}

.learning-month__entries {
  display: flex;
  flex-direction: column;
}

/* === ABOUT === */
.about {
  padding: var(--space-xl) var(--space-lg);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: 0;
}

.about__title {
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.about__intro {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-xl);
}

.about__section {
  margin-bottom: var(--space-xl);
}

.about__section-title {
  color: var(--color-secondary);
  font-size: var(--font-size-md);
  margin-bottom: var(--space-sm);
}

.about__badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
}

.about__links {
  display: flex;
  gap: var(--space-sm);
  margin: var(--space-xl) 0;
  flex-wrap: wrap;
}

.about__philosophy {
  font-style: italic;
  color: var(--color-text-muted);
  padding: var(--space-md);
  border-left: 4px solid var(--color-primary);
  background: var(--color-bg);
  margin-top: var(--space-xl);
}

/* === BACK TO TOP === */
.back-to-top {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  width: 40px;
  height: 40px;
  background: var(--color-surface);
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  border-radius: 0;
  z-index: 1000;
}

.back-to-top--visible {
  display: flex;
}

.back-to-top svg {
  width: 20px;
  height: 20px;
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .nav__toggle {
    display: flex;
    margin-left: auto;
  }

  .lang-switcher {
    margin-left: var(--space-sm);
  }

  .nav__menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-bg);
    border-bottom: 2px solid var(--color-border);
    padding: var(--space-sm) 0;
    z-index: 50;
  }

  .nav__menu--open {
    display: flex;
  }

  .nav__link {
    display: block;
    padding: var(--space-sm) var(--space-md);
  }
}

@media (max-width: 600px) {
  .page-container,
  #main,
  .footer__copy {
    width: calc(100% - 32px);
  }

  .hero,
  .hero--page,
  .mission,
  .about {
    padding: var(--space-lg) var(--space-md);
  }

  .section {
    padding: var(--space-lg) var(--space-md);
  }
}