/* ===== Theme: Slate (modern, professional) ===== */
:root {
  /* Slate palette — from Tailwind CSS: https://tailwindcss.com/docs/customizing-colors#slate */
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
  --slate-950: #020617;

  /* Brand blue (for accents) */
  --blue-500: #3b82f6;
  --blue-600: #2563eb;

  /* Default */
  --bg: var(--slate-50);
  --bg-alt: var(--slate-100);
  --card: var(--white);
  --text: var(--slate-900);
  --text-light: var(--slate-600);
  --border: var(--slate-200);
  --shadow: 0 4px 16px rgba(15, 23, 42, 0.08);
  --radius: 12px;
  --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

[data-theme="dark"] {
  --bg: var(--slate-950);
  --bg-alt: var(--slate-900);
  --card: var(--slate-800);
  --text: var(--slate-100);
  --text-light: var(--slate-400);
  --border: var(--slate-700);
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

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

body {
  font-family: 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  transition: var(--transition);
}

a {
  text-decoration: none;
  color: inherit;
}

img, svg {
  max-width: 100%;
  height: auto;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.appear {
  opacity: 1;
  transform: translateY(0);
}

.delay-1 { transition-delay: 0.2s; }
.delay-2 { transition-delay: 0.4s; }
.delay-3 { transition-delay: 0.6s; }

.slide-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-up.appear {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Navbar ===== */
.navbar {
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  transition: var(--transition);
}

[data-theme="dark"] .navbar {
  background-color: rgba(15, 23, 42, 0.9);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px;
}

.logo {
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--blue-600);
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-menu ul {
  display: flex;
  list-style: none;
  gap: 28px;
}

.nav-link {
  font-weight: 500;
  color: var(--slate-700);
  position: relative;
  padding: 4px 0;
}

[data-theme="dark"] .nav-link {
  color: var(--slate-200);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--blue-600);
  border-radius: 2px;
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--blue-600);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-lang {
  background: none;
  border: none;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--slate-600);
  cursor: pointer;
  padding: 6px 12px;
  border-radius: 6px;
  transition: var(--transition);
}

.btn-lang:hover {
  background: var(--slate-200);
  color: var(--slate-900);
}

[data-theme="dark"] .btn-lang {
  color: var(--slate-300);
}

[data-theme="dark"] .btn-lang:hover {
  background: var(--slate-700);
  color: var(--slate-100);
}

.theme-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--slate-200);
  border: none;
  color: var(--slate-700);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

[data-theme="dark"] .theme-btn {
  background: var(--slate-700);
  color: var(--slate-300);
}

.theme-btn:hover {
  background: var(--slate-300);
  transform: rotate(15deg);
}

[data-theme="dark"] .theme-btn:hover {
  background: var(--slate-600);
}

/* ===== Sections ===== */
section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.section-header h2 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--slate-900);
}

[data-theme="dark"] .section-header h2 {
  color: var(--slate-100);
}

.section-header p {
  color: var(--text-light);
  font-size: 1.1rem;
}

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

/* ===== Hero ===== */
.hero {
  padding-top: 180px;
  text-align: center;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 24px;
}


.hero p {
  font-size: 1.2rem;
  color: var(--text-light);
  margin: 0 auto 32px;
  max-width: 700px;
}

.btn-primary {
  display: inline-block;
  background: var(--blue-600);
  color: white;
  padding: 14px 36px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1.05rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.btn-primary:hover {
  background: #1d4ed8;
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.3);
}

.hero-illustration {
  margin-top: 50px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== Services ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
}

.service-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 36px 32px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--border);
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12);
}

.service-icon {
  font-size: 2.4rem;
  color: var(--blue-600);
  margin-bottom: 20px;
}

.service-card h3 {
  font-size: 1.4rem;
  margin-bottom: 16px;
}

.service-card p {
  color: var(--text-light);
}

/* ===== Portfolio ===== */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
}

.project-card {
  background: var(--card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--border);
}

.project-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.15);
}

.project-img {
  height: 180px;
  background: linear-gradient(135deg, var(--slate-200), var(--slate-300));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--slate-700);
  font-size: 3rem;
}

[data-theme="dark"] .project-img {
  background: linear-gradient(135deg, var(--slate-700), var(--slate-800));
  color: var(--slate-300);
}

.project-content {
  padding: 24px;
}

.project-content h3 {
  font-size: 1.35rem;
  margin-bottom: 12px;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0;
}

.project-tags span {
  background: var(--blue-500);
  color: white;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}

/* ===== Contact ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: start;
}

.contact-info h3 {
  font-size: 1.5rem;
  margin-bottom: 24px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 20px;
}

.contact-item i {
  font-size: 1.3rem;
  color: var(--blue-600);
  margin-top: 4px;
}

.contact-item a {
  color: var(--blue-600);
  font-weight: 500;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: transparent;
  color: var(--text);
  font-family: 'Poppins', sans-serif;
  font-size: 1rem;
  transition: var(--transition);
}

.contact-form button{
  border: none;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--blue-600);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

/* ===== Footer ===== */
.footer {
  background: var(--slate-900);
  color: var(--slate-300);
  padding: 60px 0 40px;
  text-align: center;
}

[data-theme="dark"] .footer {
  background: var(--slate-950);
}

.footer p {
  margin: 12px 0;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin: 24px 0;
}

.social-links a {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.1rem;
  transition: var(--transition);
}

.social-links a:hover {
  background: var(--blue-600);
  transform: translateY(-3px);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .navbar .container {
    padding: 14px 16px;
  }

  .logo { font-size: 1.3rem; }
  .nav-menu ul { gap: 16px; }
  .nav-actions { gap: 8px; }

  .hero {
    padding-top: 140px;
  }

  .hero h1 { font-size: 2.3rem; }
  .hero p { font-size: 1.05rem; }

  .section-header h2 { font-size: 1.8rem; }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  section {
    padding: 70px 0;
  }
}

/* ===== Tablet (769px – 1024px) ===== */
@media (min-width: 769px) and (max-width: 1024px) {
  .container {
    padding: 0 20px;
  }

  .hero h1 {
    font-size: 2.6rem;
  }

  .hero p {
    font-size: 1.15rem;
    max-width: 650px;
  }

  .services-grid,
  .portfolio-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
  }

  .section-header h2 {
    font-size: 2rem;
  }

  .contact-grid {
    gap: 40px;
  }
}

/* ===== Mobile (≤768px) — Enhanced ===== */
@media (max-width: 768px) {
  .navbar .container {
    padding: 14px 16px;
  }

  .logo {
    font-size: 1.3rem;
  }

  .nav-menu ul {
    gap: 16px;
  }

  .nav-actions {
    gap: 8px;
  }

  /* Hero */
  .hero {
    padding-top: 130px;
  }

  .hero h1 {
    font-size: 2.2rem;
    line-height: 1.3;
  }

  .hero p {
    font-size: 1rem;
    padding: 0 12px;
  }

  .btn-primary {
    padding: 12px 28px;
    font-size: 1rem;
  }

  .hero-illustration {
    margin-top: 32px;
    max-width: 320px;
  }

  /* Sections */
  section {
    padding: 60px 0;
  }

  .section-header h2 {
    font-size: 1.7rem;
  }

  .section-header p {
    font-size: 1rem;
  }

  /* Services & Portfolio Grid */
  .services-grid,
  .portfolio-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  /* Project Card */
  .project-card {
    margin: 0 auto;
    max-width: 100%;
  }

  .project-img {
    height: 140px; /* turunkan dari 180px */
    font-size: 2.5rem;
  }

  .project-content {
    padding: 20px 16px;
  }

  .project-content h3 {
    font-size: 1.25rem;
  }

  .project-tags span {
    font-size: 0.7rem;
    padding: 3px 10px;
  }

  /* Contact */
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .contact-info h3,
  .contact-form input,
  .contact-form textarea,
  .contact-form button {
    font-size: 1rem;
  }

  .contact-form input,
  .contact-form textarea {
    padding: 14px;
  }

  .contact-form button {
    padding: 14px;
    width: 100%;
  }

  /* Footer */
  .footer {
    padding: 40px 0 30px;
  }

  .social-links {
    gap: 16px;
  }

  .social-links a {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }
}

/* Extra: Very small mobile (≤480px) */
@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.9rem;
  }

  .hero p {
    font-size: 0.95rem;
  }

  .btn-primary {
    padding: 12px 24px;
    font-size: 0.95rem;
  }

  .project-img {
    height: 120px;
    font-size: 2.2rem;
  }

  .project-content h3 {
    font-size: 1.15rem;
  }

  .section-header h2 {
    font-size: 1.5rem;
  }
}