/* ============ RESET & BASE (mobile-first) ============ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --teal-700: #0f766e;
  --teal-600: #0d9488;
  --teal-50:  #f0fdfa;
  --slate-900: #0f172a;
  --slate-700: #334155;
  --slate-500: #64748b;
  --slate-200: #e2e8f0;
  --white: #ffffff;
  --amber-100: #fef3c7;
  --amber-800: #92400e;
}

html { scroll-behavior: smooth; }

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  color: var(--slate-700);
  background: var(--teal-50);
}

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

h1, h2, h3 { color: var(--slate-900); line-height: 1.25; }

.container { width: 100%; padding-inline: 1rem; margin-inline: auto; }

a { color: var(--teal-700); }
a:hover, a:focus-visible { color: var(--teal-600); }

/* Skip link untuk aksesibilitas keyboard */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--slate-900);
  color: var(--white);
  padding: .5rem 1rem;
  z-index: 100;
}
.skip-link:focus { left: .5rem; top: .5rem; }

/* ============ HEADER ============ */
.site-header {
  background: linear-gradient(135deg, var(--teal-700), var(--slate-900));
  color: var(--white);
  padding-block: 2rem;
}
.header-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1rem;
}
.avatar {
  border-radius: 50%;
  border: 4px solid rgba(255, 255, 255, .6);
}
.site-header h1 { color: var(--white); font-size: 1.6rem; }
.tagline { color: var(--teal-50); font-size: 1rem; }
.header-meta {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .4rem;
  margin-top: .5rem;
}
.header-meta li {
  background: rgba(255, 255, 255, .15);
  border-radius: 999px;
  padding: .15rem .75rem;
  font-size: .8rem;
}

/* ============ NAV ============ */
.site-nav {
  background: var(--white);
  border-bottom: 1px solid var(--slate-200);
  position: sticky;
  top: 0;
  z-index: 50;
}
.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-toggle-label {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: .75rem 1rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--teal-700);
  user-select: none;
}
.hamburger,
.hamburger::before,
.hamburger::after {
  content: "";
  display: block;
  width: 22px;
  height: 2px;
  background: var(--teal-700);
  position: relative;
  transition: transform .25s ease, opacity .25s ease;
}
.hamburger::before { position: absolute; top: -7px; }
.hamburger::after  { position: absolute; top:  7px; }

.nav-list {
  list-style: none;
  display: none;
  flex-direction: column;
  padding-inline: 1rem;
}
.nav-list a {
  display: block;
  padding: .7rem .25rem;
  text-decoration: none;
  font-weight: 500;
  border-top: 1px solid var(--slate-200);
}
.nav-toggle:checked ~ .nav-list { display: flex; }
.nav-toggle:checked ~ .nav-toggle-label .hamburger { background: transparent; }
.nav-toggle:checked ~ .nav-toggle-label .hamburger::before { transform: translateY(7px) rotate(45deg); }
.nav-toggle:checked ~ .nav-toggle-label .hamburger::after  { transform: translateY(-7px) rotate(-45deg); }
.nav-toggle:focus-visible ~ .nav-toggle-label { outline: 2px solid var(--teal-600); outline-offset: 2px; }

/* ============ MAIN / SECTIONS ============ */
main { padding-block: 1.5rem; }

section { margin-bottom: 2.5rem; }
section h2 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
  padding-bottom: .4rem;
  border-bottom: 3px solid var(--teal-600);
  display: inline-block;
}
section article { margin-bottom: 1.25rem; }
section article h3 { font-size: 1.05rem; }
.period { color: var(--slate-500); font-size: .85rem; margin-block: .15rem .4rem; }

.highlight-box {
  background: var(--amber-100);
  border-left: 4px solid var(--amber-800);
  border-radius: .5rem;
  padding: 1rem;
  margin-top: 1rem;
}
.highlight-box h3 { font-size: .95rem; color: var(--amber-800); margin-bottom: .4rem; }
.highlight-box ul { padding-left: 1.2rem; font-size: .9rem; }

.chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: .5rem;
}
.chips li {
  background: var(--teal-50);
  border: 1px solid var(--teal-600);
  color: var(--teal-700);
  border-radius: 999px;
  padding: .2rem .8rem;
  font-size: .8rem;
}

/* ---- Keahlian ---- */
.skills-grid { display: grid; gap: 1rem; }
.skill-card, .project-card {
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: .75rem;
  padding: 1rem;
  box-shadow: 0 1px 3px rgba(15, 23, 42, .06);
}
.skill-card h3, .project-card h3 { font-size: 1rem; margin-bottom: .5rem; }
.skill-card ul { padding-left: 1.2rem; font-size: .9rem; }

/* ---- Pengalaman (timeline) ---- */
.timeline-item {
  border-left: 3px solid var(--teal-600);
  padding-left: 1rem;
  position: relative;
}
.timeline-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: .4rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--teal-700);
}

/* ---- Projek ---- */
.projects-grid { display: grid; gap: 1rem; }
.project-card p { font-size: .9rem; }
.tech {
  margin-top: .6rem;
  font-size: .78rem !important;
  font-weight: 600;
  color: var(--teal-700);
}

/* ---- Kontak ---- */
.contact-list { list-style: none; }
.contact-list li { padding-block: .35rem; }

/* ============ FOOTER ============ */
.site-footer {
  background: var(--slate-900);
  color: var(--slate-200);
  text-align: center;
  padding-block: 1.5rem;
  font-size: .85rem;
}
.site-footer a { color: var(--teal-50); }

/* ============ TABLET (>= 640px) ============ */
@media (min-width: 640px) {
  .container { max-width: 640px; }
  .site-header h1 { font-size: 2rem; }
  .header-inner { text-align: left; flex-direction: row; }
  .header-meta { justify-content: flex-start; }
  .skills-grid, .projects-grid { grid-template-columns: repeat(2, 1fr); }

  .nav-toggle-label { display: none; }
  .nav-list {
    display: flex !important;
    flex-direction: row;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.25rem;
  }
  .nav-list a { border-top: none; padding: .8rem .1rem; }
}

/* ============ DESKTOP (>= 1024px) ============ */
@media (min-width: 1024px) {
  .container { max-width: 960px; }
  section h2 { font-size: 1.5rem; }
  .skills-grid { grid-template-columns: repeat(3, 1fr); }
  .projects-grid { grid-template-columns: repeat(3, 1fr); }
  .avatar { width: 150px; height: 150px; }
}