:root {
  --color-primary: #c9a227;
  --color-primary-dark: #8f7015;
  --color-secondary: #38bdf8;
  --color-bg: #0a0e1a;
  --color-bg-alt: #11172b;
  --color-card: #141a2e;
  --color-text: #e8eaf0;
  --color-text-muted: #9aa3b8;
  --color-border: #2a3350;
  --font-base: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --radius: 8px;
  --max-width: 1120px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}

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

.section__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 4rem 1.5rem;
}

section { scroll-margin-top: 80px; }

.site-header {
  position: sticky;
  top: 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  z-index: 10;
}

.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

.nav__logo-img { height: 36px; width: 36px; border-radius: 9px; display: block; }

.hero__logo {
  width: 120px;
  height: 120px;
  border-radius: 24px;
  margin: 0 auto 1.5rem;
  display: block;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.nav__toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--color-text);
  cursor: pointer;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav__links a {
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.95rem;
}

.nav__links a:hover { color: var(--color-primary); }

.nav__lang {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.35rem 0.75rem;
  color: var(--color-text);
  cursor: pointer;
  font-weight: 600;
}

.hero {
  background: linear-gradient(135deg, var(--color-bg-alt) 0%, var(--color-bg) 100%);
  color: var(--color-text);
  text-align: center;
}

.hero__content {
  max-width: 820px;
  margin: 0 auto;
  padding: 5rem 1.5rem;
}

.hero__badge {
  display: inline-block;
  margin-bottom: 1.5rem;
  padding: 0.4rem 1rem;
  border: 1px solid var(--color-primary);
  border-radius: 999px;
  color: var(--color-primary);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.hero__content h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  margin-bottom: 1.25rem;
  color: var(--color-primary);
}

.hero__content p {
  font-size: 1.1rem;
  margin-bottom: 2rem;
  color: var(--color-text-muted);
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-bg);
}

.btn--primary:hover { background: var(--color-primary-dark); }

@media (max-width: 720px) {
  .nav__toggle { display: block; }
  .nav__links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem 1.5rem;
    gap: 1rem;
    display: none;
  }
  .nav__links--open { display: flex; }
}

.tech { background: var(--color-bg-alt); }

.tech h2 { font-size: 1.85rem; margin-bottom: 0.75rem; color: var(--color-primary); }

.section__intro { color: var(--color-text-muted); margin-bottom: 2.5rem; max-width: 640px; }

.tech__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.tech__card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.tech__card h3 { font-size: 1.05rem; margin-bottom: 0.5rem; color: var(--color-secondary); }

.tech__card p { color: var(--color-text-muted); font-size: 0.95rem; }

.problem h2 { font-size: 1.6rem; margin-bottom: 0.75rem; color: var(--color-primary); }

.problem__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2.5rem;
}

.problem__col p { color: var(--color-text-muted); }

.problem__col ul {
  margin-top: 0.75rem;
  padding-left: 1.2rem;
  color: var(--color-text-muted);
}

.problem__col li { margin-bottom: 0.4rem; }

.features h2 {
  font-size: 1.85rem;
  margin-bottom: 2.5rem;
  color: var(--color-primary);
  text-align: center;
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.feature__card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.feature__card h3 { font-size: 1rem; margin-bottom: 0.5rem; color: var(--color-primary); }

.feature__card p { color: var(--color-text-muted); font-size: 0.9rem; }

.features__integration {
  text-align: center;
  margin-top: 2.5rem;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.architecture { background: var(--color-bg-alt); }

.architecture h2 {
  font-size: 1.85rem;
  margin-bottom: 0.75rem;
  color: var(--color-primary);
  text-align: center;
}

.architecture .section__intro {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.architecture__figure {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  max-width: 1000px;
  margin: 0 auto;
}

.architecture__figure img { width: 100%; }

.architecture__figure figcaption {
  padding: 1rem 1.5rem;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  text-align: center;
  background: var(--color-card);
}

.flow { background: var(--color-bg); }

.flow h2 {
  font-size: 1.85rem;
  margin-bottom: 2.5rem;
  color: var(--color-primary);
  text-align: center;
}

.flow__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.flow__card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  border-top: 3px solid var(--color-secondary);
  padding: 1.5rem;
}

.flow__card h3 { font-size: 1.05rem; margin-bottom: 0.75rem; color: var(--color-secondary); }

.flow__steps {
  list-style: none;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.flow__steps li {
  position: relative;
  padding-left: 1.4rem;
  margin-bottom: 0.4rem;
}

.flow__steps li::before {
  content: "\2192";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
}

.impact h2 {
  font-size: 1.85rem;
  margin-bottom: 2.5rem;
  color: var(--color-primary);
  text-align: center;
}

.impact { background: var(--color-bg-alt); }

.impact__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  text-align: center;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem 1rem;
}

.stat__value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-primary);
}

.stat__label {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.recognition {
  background: var(--color-bg-alt);
  color: var(--color-text);
  text-align: center;
  border-top: 2px solid var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
}

.recognition h2 { font-size: 1.5rem; margin-bottom: 0.75rem; color: var(--color-primary); }

.recognition p { max-width: 680px; margin: 0 auto 0.75rem; color: var(--color-text-muted); }

.recognition p:last-child { margin-bottom: 0; }

.cta { text-align: center; }

.cta h2 { font-size: 1.85rem; margin-bottom: 0.75rem; color: var(--color-primary); }

.cta p { color: var(--color-text-muted); margin-bottom: 1.75rem; }

.cta__contact {
  margin-top: 1.5rem;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.cta__contact a { color: var(--color-secondary); text-decoration: none; }

.cta__contact a:hover { text-decoration: underline; }

.site-footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  text-align: center;
  padding: 1.5rem;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.footer__brand-line {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.35rem;
}

/* Poster projek */
.poster { background: var(--color-bg); }
.poster h2 { font-size: 1.85rem; margin-bottom: 1.5rem; color: var(--color-primary); text-align: center; }
.poster__frame {
  display: block;
  max-width: 720px;
  margin: 0 auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.4);
  transition: transform 0.15s ease;
}
.poster__frame:hover { transform: translateY(-3px); }
.poster__frame img { width: 100%; height: auto; display: block; }
.poster__hint { text-align: center; margin-top: 0.9rem; color: var(--color-text-muted); font-size: 0.85rem; }