/* Versi portfolio terdahulu: kod asal untuk paparan arkib dan interaksi berkaitan. */
/* ============================================
   MUHAMMAD NAQIUDIN — PORTFOLIO STYLESHEET
   Modern, Minimal, Tech-Focused Dark Theme
   Mobile-First Responsive Design
   ============================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

/* ---------- CSS Reset & Base ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* ---------- CSS Variables (Dark Theme Default) ---------- */
:root {
  /* Colors */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a2e;
  --bg-card-hover: #222240;
  --text-primary: #e8e8f0;
  --text-secondary: #a0a0b8;
  --text-muted: #6b6b80;
  --accent: #6c63ff;
  --accent-light: #8b83ff;
  --accent-dark: #4a42d4;
  --accent-glow: rgba(108, 99, 255, 0.12);
  --gradient-accent: linear-gradient(135deg, #6c63ff 0%, #3b82f6 100%);
  --border-color: rgba(108, 99, 255, 0.15);
  --border-subtle: rgba(255, 255, 255, 0.06);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(108, 99, 255, 0.1);

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --section-padding: 5rem 1.5rem;
  --container-max: 1200px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-primary);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent-dark); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--accent-light); }

img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* ---------- Utility Classes ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: 0.75rem;
  display: block;
}

.section-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
  line-height: 1.2;
}

.section-title .highlight {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.8;
}

/* Scroll-triggered animations */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

.fade-in-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-in-left.visible { opacity: 1; transform: translateX(0); }

.fade-in-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-in-right.visible { opacity: 1; transform: translateX(0); }

/* Staggered children */
.stagger-children .fade-in:nth-child(1) { transition-delay: 0.05s; }
.stagger-children .fade-in:nth-child(2) { transition-delay: 0.1s; }
.stagger-children .fade-in:nth-child(3) { transition-delay: 0.15s; }
.stagger-children .fade-in:nth-child(4) { transition-delay: 0.2s; }
.stagger-children .fade-in:nth-child(5) { transition-delay: 0.25s; }
.stagger-children .fade-in:nth-child(6) { transition-delay: 0.3s; }
.stagger-children .fade-in:nth-child(7) { transition-delay: 0.35s; }
.stagger-children .fade-in:nth-child(8) { transition-delay: 0.4s; }

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 1rem 0;
  transition: background-color var(--transition-base),
              box-shadow var(--transition-base),
              padding var(--transition-base);
}

.navbar.scrolled {
  background-color: rgba(10, 10, 15, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--border-subtle);
  padding: 0.6rem 0;
}

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

.nav-logo {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}
.nav-logo .dot { color: var(--accent); }

.nav-links {
  display: none;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: 1px;
  transition: width var(--transition-base);
}
.nav-links a:hover,
.nav-links a.active { color: var(--text-primary); }
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }

.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
  z-index: 1001;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}
.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile menu */
.nav-mobile {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: rgba(10, 10, 15, 0.97);
  backdrop-filter: blur(20px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
}
.nav-mobile.open { display: flex; }
.nav-mobile a {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}
.nav-mobile a:hover { color: var(--accent); }

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding: 8rem 1.5rem 4rem;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(108, 99, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(108, 99, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  top: 10%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(108, 99, 255, 0.08), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: float 8s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-20px, -30px); }
}

.hero .container { position: relative; z-index: 1; }

.hero-content { max-width: 720px; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent-glow);
  border: 1px solid var(--border-color);
  border-radius: 50px;
  padding: 0.4rem 1rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent-light);
  margin-bottom: 1.5rem;
}
.hero-badge .pulse {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

.hero h1 {
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 0.5rem;
  letter-spacing: -1.5px;
}

.hero .hero-name {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-weight: 400;
  line-height: 1.7;
}

.hero-roles {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}
.hero-roles .role-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--border-color);
  border-radius: 50px;
  color: var(--text-secondary);
  background: var(--bg-secondary);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.8rem;
  background: var(--gradient-accent);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(108, 99, 255, 0.3);
  color: #fff;
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.8rem;
  background: transparent;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.btn-outline:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
  color: var(--accent-light);
}

.hero-socials {
  display: flex;
  gap: 1rem;
}
.hero-socials a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 1.2rem;
  transition: all var(--transition-fast);
}
.hero-socials a:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
  transform: translateY(-2px);
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about { padding: var(--section-padding); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
}

.about-image-wrapper {
  position: relative;
  max-width: 300px;
  margin: 0 auto;
}
.about-image-wrapper img {
  border-radius: var(--radius-lg);
  border: 2px solid var(--border-color);
}
.about-image-wrapper::after {
  content: '';
  position: absolute;
  inset: -8px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  opacity: 0.3;
  pointer-events: none;
}

.about-text p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}

.stat-card {
  text-align: center;
  padding: 1.5rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-base);
}
.stat-card:hover { border-color: var(--border-color); }
.stat-number {
  font-size: 2rem;
  font-weight: 700;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
}
.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
  display: block;
}

/* ============================================
   EXPERIENCE SECTION
   ============================================ */
.experience {
  padding: var(--section-padding);
  background: var(--bg-secondary);
}

.experience-block { margin-top: 3rem; }
.experience-block-title {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.experience-block-title .highlight {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.timeline {
  position: relative;
  max-width: 800px;
  padding-left: 2rem;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), transparent);
}

.timeline-item {
  position: relative;
  padding-bottom: 2.5rem;
  padding-left: 2rem;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -2rem;
  top: 0.5rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg-secondary);
  margin-left: -5px;
}

.timeline-item .timeline-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
  display: block;
}

.timeline-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: border-color var(--transition-base), transform var(--transition-base);
}
.timeline-card:hover {
  border-color: var(--border-color);
  transform: translateX(4px);
}
.timeline-card h3 { font-size: 1.15rem; font-weight: 600; margin-bottom: 0.3rem; }
.timeline-card .institution { color: var(--accent); font-size: 0.95rem; font-weight: 500; }
.timeline-card p { color: var(--text-secondary); font-size: 0.9rem; margin-top: 0.5rem; }
.timeline-card .timeline-logo {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-sm);
  object-fit: contain;
  margin-bottom: 0.75rem;
  background: rgba(255,255,255,0.05);
  padding: 4px;
}

/* ============================================
   SKILLS SECTION
   ============================================ */
.skills { padding: var(--section-padding); }

.skills-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  justify-content: center;
}
.skills-tabs .tab-btn {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.5rem 1.2rem;
  border: 1px solid var(--border-subtle);
  border-radius: 50px;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.skills-tabs .tab-btn:hover,
.skills-tabs .tab-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}

.skills-grid {
  display: none;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 1rem;
  justify-items: center;
}
.skills-grid.active { display: grid; }

.skill-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1.2rem 0.8rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  width: 100%;
  max-width: 120px;
  transition: all var(--transition-base);
  cursor: default;
}
.skill-item:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.skill-item img { width: 40px; height: 40px; object-fit: contain; }
.skill-item span {
  font-size: 0.72rem;
  color: var(--text-secondary);
  text-align: center;
  font-weight: 500;
}

/* ============================================
   PROJECTS SECTION
   ============================================ */
.projects {
  padding: var(--section-padding);
  background: var(--bg-secondary);
}

.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 3rem;
}

.project-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
}
.project-card:hover {
  border-color: var(--border-color);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.project-card-image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/10;
}
.project-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}
.project-card:hover .project-card-image img { transform: scale(1.05); }
.project-card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10, 10, 15, 0.9) 0%, transparent 60%);
  display: flex;
  align-items: flex-end;
  padding: 1.5rem;
  opacity: 0;
  transition: opacity var(--transition-base);
}
.project-card:hover .project-card-overlay { opacity: 1; }
.project-card-overlay a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}
.project-card-overlay a:hover { background: var(--accent-light); color: #fff; }

.project-card-body { padding: 1.5rem; }
.project-card-body .project-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 0.5rem;
  display: block;
}
.project-card-body h3 { font-size: 1.15rem; font-weight: 600; margin-bottom: 0.5rem; line-height: 1.3; }
.project-card-body p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }

/* ============================================
   CERTIFICATIONS SECTION
   ============================================ */
.certifications-section { padding: var(--section-padding); }

.cert-slider {
  position: relative;
  max-width: 900px;
  margin: 2.5rem auto 0;
}

.cert-track {
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  gap: 1.5rem;
  padding: 1rem 0 2rem;
  scrollbar-width: none;
}
.cert-track::-webkit-scrollbar { display: none; }

.cert-card {
  min-width: 280px;
  max-width: 320px;
  flex-shrink: 0;
  scroll-snap-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
}
.cert-card:hover {
  border-color: var(--border-color);
  transform: translateY(-4px);
}
.cert-card img { width: 100%; height: 180px; object-fit: contain; background: rgba(255,255,255,0.03); padding: 0.5rem; }
.cert-card-body { padding: 1.25rem; }
.cert-card-body h3 { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.5rem; line-height: 1.4; }
.cert-card-body p { font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 0.25rem; }
.cert-card-body a {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  margin-top: 0.75rem;
}
.cert-card-body a:hover { color: var(--accent-light); }

.cert-nav {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1rem;
}
.cert-nav button {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}
.cert-nav button:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact {
  padding: var(--section-padding);
  background: var(--bg-secondary);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2.5rem;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-base);
}
.contact-item:hover { border-color: var(--border-color); }
.contact-item .contact-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  background: var(--accent-glow);
  border-radius: var(--radius-sm);
  color: var(--accent);
  font-size: 1.2rem;
}
.contact-item-text h4 {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 0.15rem;
}
.contact-item-text p,
.contact-item-text a { font-size: 0.95rem; color: var(--text-primary); }

.contact-socials {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}
.contact-socials a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 1.3rem;
  transition: all var(--transition-fast);
}
.contact-socials a:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
  transform: translateY(-2px);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--border-subtle);
  text-align: center;
}
.footer .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}
.footer p { font-size: 0.85rem; color: var(--text-muted); }
.footer-links { display: flex; gap: 1.5rem; }
.footer-links a { font-size: 0.85rem; color: var(--text-secondary); }
.footer-links a:hover { color: var(--accent); }

.back-to-top {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  color: var(--accent);
  font-size: 1.1rem;
  transition: all var(--transition-fast);
}
.back-to-top:hover { background: var(--accent); color: #fff; transform: translateY(-2px); }

/* ============================================
   PROJECT.HTML — PROJECT DETAIL PAGE
   ============================================ */
.project-detail-hero {
  padding: 8rem 1.5rem 3rem;
  text-align: center;
}

.project-detail-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 2rem;
}
.project-detail-nav a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.4rem 1rem;
  border: 1px solid var(--border-subtle);
  border-radius: 50px;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.project-detail-nav a:hover,
.project-detail-nav a.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}

.back-home-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 2rem;
  padding: 0.6rem 1.4rem;
  background: var(--accent-glow);
  border: 1px solid var(--border-color);
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}
.back-home-btn:hover { background: var(--accent); color: #fff; }

/* Project sections */
.project-section {
  padding: var(--section-padding);
  border-bottom: 1px solid var(--border-subtle);
}
.project-section:nth-child(even of section) {
  background: var(--bg-secondary);
}

.project-section .section-title {
  text-align: center;
  margin-bottom: 2rem;
}

/* Swiper overrides for project page */
.project-swiper-wrapper {
  max-width: 800px;
  margin: 0 auto 2rem;
}
.project-swiper-wrapper .swiper {
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.project-swiper-wrapper .swiper-slide img {
  width: 100%;
  height: auto;
  max-height: 500px;
  object-fit: contain;
  border-radius: var(--radius-md);
  background: var(--bg-card);
}
.project-swiper-wrapper .swiper-button-next,
.project-swiper-wrapper .swiper-button-prev { color: var(--accent); }
.project-swiper-wrapper .swiper-pagination-bullet { background: var(--text-muted); }
.project-swiper-wrapper .swiper-pagination-bullet-active { background: var(--accent); }

/* Project description cards */
.project-desc-card {
  max-width: 800px;
  margin: 0 auto 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
}
.project-desc-card h2 {
  font-size: 1.4rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--accent);
  color: var(--text-primary);
}
.project-desc-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1rem;
}
.project-desc-card strong { color: var(--text-primary); }

.project-features {
  background: var(--accent-glow);
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}
.project-features h3 { font-size: 1rem; font-weight: 600; margin-bottom: 0.75rem; color: var(--text-primary); }
.project-features ul { list-style: disc; margin-left: 1.25rem; }
.project-features li {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 0.4rem;
}

/* Tools grid */
.tools-label {
  text-align: center;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
}
.tools-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  max-width: 600px;
  margin: 0 auto 3rem;
}
.tools-grid .skill-item {
  max-width: 90px;
  padding: 0.8rem 0.5rem;
}
.tools-grid .skill-item img { width: 36px; height: 36px; }
.tools-grid .skill-item span { font-size: 0.65rem; }

/* ============================================
   RESPONSIVE — Tablet (768px+)
   ============================================ */
@media (min-width: 768px) {
  :root { --section-padding: 6rem 2rem; }

  .nav-links { display: flex; }
  .nav-toggle { display: none; }

  .hero { padding: 0 2rem; }

  .about-grid { grid-template-columns: 1fr 1.5fr; }

  .projects-grid { grid-template-columns: repeat(2, 1fr); }

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

  .cert-card { min-width: 300px; }

  .skills-grid { grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); }
}

/* ============================================
   RESPONSIVE — Desktop (1024px+)
   ============================================ */
@media (min-width: 1024px) {
  :root { --section-padding: 7rem 2rem; }

  .hero { padding: 0 2rem; }

  .projects-grid { grid-template-columns: repeat(3, 1fr); }
}

/* ============================================
   RESPONSIVE — Large Desktop (1280px+)
   ============================================ */
@media (min-width: 1280px) {
  .projects-grid { grid-template-columns: repeat(4, 1fr); }
}

/* ============================================
   REDUCED MOTION
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .fade-in, .fade-in-left, .fade-in-right { opacity: 1; transform: none; }
}

/* Pautan pulang versi lama; tidak menutup kandungan atau kawalan asal. */
.version-return { position:relative; display:block; z-index:1001; padding:12px 18px; background:#12233c; color:#fff; text-align:center; font:14px/1.5 system-ui; }
body { padding-top:44px; }
.navbar { top:44px; }

/* Pembetulan intrinsik grid lama untuk Safari/WebKit pada telefon sempit.
   Reka bentuk asal dikekalkan; teks statistik tidak memaksa lebar halaman. */
.about-grid > * { min-width: 0; }
.about-image-wrapper { width: 100%; }
.about-stats { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.stat-label { overflow-wrap: anywhere; }
/* Hadkan lapisan transform Swiper kepada ruang galeri, termasuk pada WebKit. */
.project-swiper-wrapper { min-width: 0; overflow: hidden; }
.project-desc-card { overflow-wrap: anywhere; }
@media (max-width: 767px) {
  .about-grid { grid-template-columns: minmax(0, 1fr); }
  .about-stats { gap: 8px; }
  .stat-card { padding: 15px 8px; }
  .stat-label { font-size: .7rem; }
  .cert-card { min-width: min(280px, 85vw); max-width: 85vw; }
}
@media (prefers-reduced-motion: reduce) {
  .fade-in, .fade-in-left, .fade-in-right { transform: none; opacity: 1; }
}