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

:root {
  --cream: #F9F6F1;
  --white: #FFFFFF;
  --ink: #1A1A1A;
  --ink-soft: #3A3A3A;
  --ink-muted: #6A6A6A;
  --accent: #1B4FD8;
  --accent-light: #E8EEFB;
  --accent-soft: #3B6FF0;
  --border: #D2CDC7;
  --gold: #C9A84C;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'DM Sans', sans-serif;
  background-color: var(--cream);
  color: var(--ink);
  line-height: 1.6;
  overflow-x: hidden;
  padding-top: 64px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

a, button, .menu-toggle, .close-btn {
  -webkit-tap-highlight-color: #fff0;
}

nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgb(249 246 241 / .95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 5%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  transition: opacity 0.4s ease, transform 0.4s ease;
  opacity: 1;
  transform: translateY(0);
}

nav.nav-hidden {
  opacity: 0;
  transform: translateY(-10px);
  pointer-events: none;
}

.nav-logo {
  font-family: 'DM Serif Display', serif;
  font-size: 1.1rem;
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  transition: transform 0.15s cubic-bezier(.4,0,.2,1), opacity 0.15s ease;
}

.nav-logo:active {
  transform: scale(.96);
  opacity: .75;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--ink);
}

.nav-overlay {
  display: flex;
  align-items: center;
}

.overlay-links {
  list-style: none;
  display: flex;
  flex-direction: row;
  gap: 2rem;
}

.overlay-links a {
  text-decoration: none;
  font-size: .875rem;
  font-weight: 500;
  color: var(--ink-soft);
  letter-spacing: .03em;
  transition: color 0.2s;
}

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

.overlay-header {
  display: none;
}

.certificates-page {
  padding-top: 40px;
  flex-grow: 1;
}

.section-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 5%;
}

.back-btn-wrap {
  margin-bottom: 2rem;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  text-decoration: none;
  color: var(--accent);
  font-weight: 600;
  font-size: .95rem;
  transition: transform 0.15s ease;
}

.back-btn:active {
  transform: scale(.96);
}

.section-label {
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: .6rem;
}

.section-title {
  font-family: 'DM Serif Display', serif;
  font-size: clamp(1.9rem, 3.5vw, 2.6rem);
  color: var(--ink);
  line-height: 1.15;
}

.divider {
  width: 48px;
  height: 3px;
  background: var(--accent);
  margin: 1rem 0 2.5rem;
  border-radius: 2px;
}

.cert-buttons-wrapper {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 3rem;
}

.cert-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .6rem 1.2rem;
  font-family: 'DM Sans', sans-serif;
  font-size: .85rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 6px;
  transition: all 0.2s ease;
  cursor: pointer;
  white-space: nowrap;
}

.cert-btn.btn-secondary {
  background-color: #fff0;
  color: var(--accent);
  border: 2px solid var(--accent);
}

.cert-btn.btn-secondary.active-filter, .cert-btn.btn-secondary:hover {
  background-color: var(--accent);
  color: var(--white);
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.75rem;
}

.project-card {
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--white);
  box-shadow: 0 4px 12px rgb(0 0 0 / .02);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
  transition: box-shadow 0.25s, transform 0.25s;
}

.project-card:hover {
  box-shadow: 0 10px 36px rgb(0 0 0 / .1);
  transform: translateY(-4px);
}

.project-img-wrap {
  width: 100%;
  aspect-ratio: 16/9;
  background: #EAEAEA;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

.project-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}

.project-card:hover .project-img-wrap img {
  transform: scale(1.03);
}

.project-info {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  flex-grow: 1;
}

.project-badge {
  display: inline-block;
  font-size: .72rem;
  font-weight: 700 !important;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: .25rem .75rem;
  border-radius: 20px;
  margin-bottom: 1rem;
  align-self: flex-start;
}

/* Badge warna */
.badge-ai {
  background-color: #E0F2FE !important;
  color: #0369A1 !important;
}
.badge-cisco {
  background-color: #FEF3C7 !important;
  color: #B45309 !important;
}
.badge-linux {
  background-color: #DCFCE7 !important;
  color: #15803D !important;
}
.badge-mikrotik {
  background-color: #FEE2E2 !important;
  color: #B91C1C !important;
}
.badge-windows {
  background-color: #EDE9FE !important;
  color: #6D28D9 !important;
}
.badge-website {
  background-color: #E0E7FF !important;
  color: #3730A3 !important;
}
.badge-default {
  background-color: #E5E7EB !important;
  color: #374151 !important;
}

.project-title {
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--ink);
  margin-bottom: .5rem;
}

.project-desc {
  font-size: .88rem;
  color: var(--ink-soft) !important;
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .5rem 1rem;
  background-color: #fff0;
  color: var(--accent);
  border: 1.5px solid var(--accent);
  border-radius: 4px;
  font-size: .85rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  align-self: flex-start;
  transition: all 0.2s;
}

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

footer {
  text-align: center;
  padding: 2rem;
  margin-top: auto;
  font-size: .82rem;
  color: var(--ink-muted) !important;
  border-top: 1px solid var(--border);
  background: var(--white);
}

/* ========== RESPONSIVE ========== */
@media (min-width: 769px) {
  .cert-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }
  .nav-overlay {
    position: fixed;
    top: 0;
    right: -100%;
    width: 190px;
    height: 100vh;
    background: var(--white);
    box-shadow: -5px 0 30px rgb(0 0 0 / .05);
    z-index: 200;
    padding: 16px 20px;
    flex-direction: column;
    justify-content: flex-start;
    align-items: flex-start;
    gap: 1.2rem;
    transition: right 0.4s cubic-bezier(.16,1,.3,1);
  }
  .nav-overlay.open {
    right: 0;
  }
  .overlay-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    border-bottom: 1px solid var(--border);
    padding-bottom: .5rem;
  }
  .close-btn {
    font-size: 2rem;
    color: var(--ink-soft);
    cursor: pointer;
    line-height: 1;
  }
  .overlay-title {
    display: block;
    font-size: .85rem;
    font-weight: 600;
    letter-spacing: .05em;
    text-transform: uppercase;
    color: var(--ink-soft) !important;
  }
  .overlay-links {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
    width: 100%;
  }
  .overlay-links a {
    font-size: 1.05rem;
    width: 100%;
  }
}

/* ========== TAMBAHAN UNTUK TOMBOL BAGIKAN ========== */
.project-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 0.5rem;
  gap: 1rem;
}

.project-share {
  background: none;
  border: 1.5px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.8rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink-muted);
  transition: all 0.2s;
  background-color: transparent;
}

.project-share:hover {
  background-color: var(--cream);
  color: var(--accent);
  border-color: var(--accent);
}

.project-share svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
}

@media (max-width: 480px) {
  .project-actions {
    flex-direction: column;
    gap: 0.75rem;
  }
  .project-link, .project-share {
    width: 100%;
    justify-content: center;
  }
}