@import url('https://fonts.googleapis.com/css2?family=Rajdhani:wght@400;500;600;700&family=Share+Tech+Mono&family=Exo+2:wght@300;400;600;800&family=Poppins:wght@300;400;500;600;700;800&display=swap');

:root {
  /* Background & Panel Colors - LIGHT MINIMALIST MONOCHROME */
  --bg:        #ffffff;
  --panel:     #f8f9fa;
  --panel2:    #e9ecef;
  --border:    #dee2e6;
  
  /* Accent Colors - MINIMAL ESSENTIAL (LIGHT THEME) */
  --accent-orange: #e67e22;
  --accent-red:    #e74c3c;
  --accent-blue:   #6c757d;
  --accent-cyan:   #5a6c7d;
  --accent-green:  #6c757d;
  --accent-yellow: #8e8e8e;
  
  /* Text Colors - LIGHT THEME MONOCHROME */
  --text:     #333333;    
  --text-dim: #6c757d;
  
  /* Font Variables */
  --font-text: 'Poppins', sans-serif;
  --font-diagram: 'Share Tech Mono', monospace;
  --font-formula: 'Cambria Math', 'Cambria', serif;
  
  /* WARNA UTAMA (UI Colors) - LIGHT THEME MONOCHROME */
  --color-white: #ffffff;
  --color-black: #000000;
  --color-dark-bg: #f8f9fa;
  --color-overlay-dark-85: rgba(248, 249, 250, 0.85);
  --color-overlay-dark-95: rgba(248, 249, 250, 0.95);
  --color-overlay-dark-98: rgba(248, 249, 250, 0.98);
  --color-overlay-black: rgba(0, 0, 0, 0.1);
  --color-overlay-white-light: rgba(0, 0, 0, 0.02);
  --color-overlay-white-md: rgba(0, 0, 0, 0.03);
  --color-overlay-white-heavy: rgba(0, 0, 0, 0.05);
  --color-overlay-blue-light: rgba(108, 117, 125, 0.08);
  --color-overlay-blue-md: rgba(108, 117, 125, 0.1);
  --color-overlay-blue-heavy: rgba(108, 117, 125, 0.2);
  --color-overlay-blue-strong: rgba(108, 117, 125, 0.3);
  --color-overlay-blue-xlight: rgba(108, 117, 125, 0.12);
  --color-overlay-blue-softer: rgba(108, 117, 125, 0.08);
  --color-overlay-text-dim: rgba(108, 117, 125, 0.2);
  --color-overlay-green: rgba(108, 117, 125, 0.08);
  --color-overlay-red: rgba(231, 76, 60, 0.2);
  --color-overlay-orange: rgba(230, 126, 34, 0.3);
  --color-overlay-cyan: rgba(108, 117, 125, 0.1);
  
  /* WARNA DIAGRAM (Diagram/Stroke Colors) - LIGHT THEME MUTED */
  --diagram-steam: #f4a261;
  --diagram-power: #e76f51;
  --diagram-water: #2a9d8f;
  --diagram-air: #264653;
  --diagram-crude: #e9c46a;
  --diagram-vapor: #f77f00;
  --diagram-products: #f4a261;
  --diagram-glow: #e76f51;
  --diagram-blue: #457b9d;
  --diagram-purple: #8d5a97;
  --diagram-purple-dark: #6d4c7a;
  --diagram-brown1: #a67c52;
  --diagram-brown2: #8b7355;
  --diagram-lime: #b5c689;
  --diagram-light-cyan: #7fb3d5;
  --diagram-grass: #8fb996;
}

/* Dark Theme Variables */
:root[data-theme="dark"] {
  --bg:        #121212;
  --panel:     #1e1e1e;
  --panel2:    #2d2d2d;
  --border:    #333333;
  
  --text:      #f8f9fa;
  --text-dim:  #adb5bd;
  
  --color-white: #121212;
  --color-black: #ffffff;
  --color-dark-bg: #1e1e1e;
  
  --color-overlay-dark-85: rgba(18, 18, 18, 0.85);
  --color-overlay-dark-95: rgba(18, 18, 18, 0.95);
  --color-overlay-dark-98: rgba(18, 18, 18, 0.98);
  --color-overlay-black: rgba(255, 255, 255, 0.1);
  --color-overlay-white-light: rgba(255, 255, 255, 0.02);
  --color-overlay-white-md: rgba(255, 255, 255, 0.05);
  --color-overlay-white-heavy: rgba(255, 255, 255, 0.1);
  
  --color-overlay-text-dim: rgba(255, 255, 255, 0.2);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { background: var(--bg); color: var(--text); font-family: var(--font-text); height: 100vh; display: flex; flex-direction: column; overflow-y: auto; scroll-behavior: smooth; transition: background-color 0.3s ease, color 0.3s ease; }
svg text, svg tspan { font-family: var(--font-diagram) !important; }

header { background: var(--bg); border-bottom: 1px solid var(--border); padding: 10px 40px; display: flex; align-items: center; justify-content: space-between; flex-shrink: 0; z-index: 1000; gap: 15px; position: fixed; top: 0; left: 0; right: 0; }
.header-title { display: flex; align-items: center; gap: 12px; font-family: var(--font-text); font-size: 1.4rem; font-weight: 600; letter-spacing: 0px; color: var(--text); white-space: nowrap; cursor: pointer; }
.logo-wrapper { display: inline-flex; align-items: center; justify-content: center; height: 1.8rem; cursor: pointer; }
.logo-wrapper svg { height: 100%; width: auto; }

/* Menyesuaikan warna logo secara aman tanpa merusak struktur SVG asli */
.logo-wrapper svg {
  filter: brightness(0); /* Memaksa piksel logo menjadi hitam di Light Theme */
  transition: filter 0.3s ease;
}
:root[data-theme="dark"] .logo-wrapper svg {
  filter: brightness(0) invert(1); /* Membalikkan piksel hitam menjadi putih di Dark Theme */
}

/* Theme Toggle Button */
.theme-toggle {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 9999;
  background: var(--panel2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 50%;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.5rem;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}
.theme-toggle:hover {
  background: var(--text);
  color: var(--bg);
}

.main-content { flex: 1; padding: 15px 40px; width: 100%; display: flex; flex-direction: column; }
.page-section { display: block; width: 100%; min-height: 100vh; padding: 100px 0 80px 0; opacity: 0; transform: translateY(50px); transition: all 0.8s ease-out; }
.page-section.active { opacity: 1; transform: translateY(0); }

/* HERO SECTION */
.hero-section {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 100vh;
  text-align: left;
  gap: 40px;
}
.hero-content { max-width: 600px; }
.hero-animation {
  flex-shrink: 0;
  width: 450px;
  height: 450px;
}
#lemniscate-canvas { width: 100%; height: 100%; }
.hero-title { font-size: 3.5rem; font-weight: 700; color: var(--text); margin-bottom: 20px; line-height: 1.1; }
.hero-subtitle { font-size: 1.3rem; color: var(--text-dim); margin-bottom: 40px; line-height: 1.4; }
.cta-btn { background: var(--color-black); color: var(--color-white); border: none; padding: 16px 32px; border-radius: 8px; font-size: 1.1rem; font-weight: 700; cursor: pointer; transition: all 0.3s ease; }
.cta-btn:hover { background: var(--text); transform: translateY(-2px); }

/* SECTION CONTAINER */
.section-container { max-width: 1200px; margin: 0; padding: 0; }

/* PROJECTS GRID */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); gap: 40px; margin-top: 50px; }
.project-item { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; cursor: pointer; transition: all 0.3s ease; }
.project-item:hover { transform: translateY(-5px); box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1); }
.project-image { height: 200px; overflow: hidden; background: var(--panel2); display: flex; align-items: center; justify-content: center; }
.project-image img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.3s ease; }
.project-item:hover .project-image img { transform: scale(1.05); }
.project-info { padding: 25px; }
.project-info h3 { font-size: 1.4rem; font-weight: 700; margin-bottom: 10px; color: var(--text); }
.project-info p { color: var(--text-dim); line-height: 1.5; }

/* ABOUT GRID */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; margin-top: 50px; }
.about-content h3 { font-size: 2rem; font-weight: 700; margin-bottom: 20px; color: var(--text); }
.about-content p { font-size: 1.1rem; line-height: 1.6; color: var(--text-dim); margin-bottom: 30px; }
.contact-info { font-family: var(--font-diagram); font-size: 1.1rem; color: var(--text); }
.contact-info p { margin-bottom: 8px; }

/* CONTACT FORM */
.contact-form h3 { font-size: 1.8rem; font-weight: 700; margin-bottom: 25px; color: var(--text); }
.contact-form form { display: flex; flex-direction: column; gap: 20px; }
.contact-form input, .contact-form textarea { background: var(--panel); border: 1px solid var(--border); padding: 15px; border-radius: 8px; color: var(--text); font-family: var(--font-text); font-size: 1rem; transition: border-color 0.3s ease; }
.contact-form input:focus, .contact-form textarea:focus { outline: none; border-color: var(--accent-orange); }
.contact-form textarea { height: 120px; resize: vertical; }
.submit-btn { background: var(--color-black); color: var(--color-white); border: none; padding: 15px; border-radius: 8px; font-weight: 700; font-size: 1rem; cursor: pointer; transition: all 0.3s ease; }
.submit-btn:hover { background: var(--text); transform: translateY(-1px); }

.status-row { display: flex; justify-content: space-between; align-items: center; padding: 12px 0; border-bottom: 1px solid var(--color-overlay-white-md); }
.status-tag { padding: 4px 10px; border-radius: 4px; font-size: 0.7rem; font-weight: 800; font-family: var(--font-diagram); }
.status-ok { background: rgba(34, 197, 94, 0.15); color: var(--accent-green); border: 1px solid var(--accent-green); }
.status-warn { background: rgba(250, 204, 21, 0.15); color: var(--accent-yellow); border: 1px solid var(--accent-yellow); }

.alarm-list { display: flex; flex-direction: column; gap: 10px; }
.alarm-item { display: flex; gap: 15px; padding: 10px; border-radius: 6px; font-size: 0.85rem; border-left: 4px solid #ccc; background: var(--color-overlay-white-light); }
.alarm-item.crit { border-color: var(--accent-red); color: #fda4af; }
.alarm-item.warn { border-color: var(--accent-yellow); }
.alarm-item.info { border-color: var(--accent-blue); }
.alarm-time { font-family: var(--font-diagram); opacity: 0.6; }

/* DIAGRAM UI */
.diagram-wrapper { position: relative; background: #0A0D14; border: 1px solid var(--border); border-radius: 12px; overflow: hidden; flex: 1; width: 100%; display: none; align-items: center; justify-content: center; cursor: grab; user-select: none; }
.diagram-wrapper.active { display: flex; }
.diagram-wrapper svg { 
    display: block; width: 100%; height: 100%; object-fit: contain; overflow: visible !important; 
    will-change: transform; backface-visibility: hidden; transform: translateZ(0);
}


.sub-nav { display: flex; gap: 10px; margin-bottom: 15px; border-bottom: 1px solid var(--border); padding-bottom: 10px; overflow-x: auto; scrollbar-width: thin; scrollbar-color: var(--accent-blue) transparent; }
.sub-nav::-webkit-scrollbar { height: 4px; }
.sub-nav::-webkit-scrollbar-thumb { background: var(--accent-blue); border-radius: 10px; }
.sub-item { padding: 5px 15px; font-family: var(--font-text); font-size: 0.8rem; font-weight: 700; color: var(--text-dim); cursor: pointer; border: 1px solid var(--border); border-radius: 4px; transition: 0.2s; white-space: nowrap; }
.sub-item.active { background: var(--color-overlay-blue-light); border-color: var(--accent-blue); color: var(--accent-blue); }
.page-title { font-family: var(--font-text); color: var(--accent-yellow); font-size: 1.3rem; margin-bottom: 10px; letter-spacing: 2px; display: flex; align-items: center; gap: 10px; flex-shrink: 0; }

.placeholder-card { background: var(--panel2); border: 1px dashed var(--border); padding: 30px; text-align: left; border-radius: 12px; color: var(--text-dim); flex: 1; display: flex; align-items: flex-start; justify-content: center; flex-direction: column; font-family: var(--font-text); font-size: 1.2rem; }

 .filter-panel { display: flex; gap: 8px; margin-bottom: 15px; flex-wrap: wrap; background: var(--color-overlay-dark-85); border: 1px solid var(--border); border-radius: 999px; padding: 6px 8px; }
 .filter-btn { background: var(--color-overlay-white-heavy); border: 1px solid var(--color-overlay-text-dim); color: var(--text); padding: 6px 14px; border-radius: 999px; font-family: var(--font-text); font-weight: 700; font-size: 0.82rem; cursor: pointer; transition: all 0.2s ease; box-shadow: none; }
 .filter-btn:hover { background: var(--color-overlay-blue-softer); border-color: var(--color-overlay-blue-strong); }
 .filter-btn.active { background: var(--accent-blue); border-color: var(--accent-blue); color: var(--bg); box-shadow: 0 0 10px var(--color-overlay-blue-md); }

.diagram-wrapper { position: relative; background: #0A0D14; border: 1px solid var(--border); border-radius: 12px; overflow: hidden; flex: 1; width: 100%; display: none; align-items: center; justify-content: center; cursor: grab; user-select: none; }
.diagram-wrapper.active { display: flex; }
.diagram-wrapper svg { 
    display: block; width: 100%; height: 100%; object-fit: contain; overflow: visible !important; 
    will-change: transform; backface-visibility: hidden; transform: translateZ(0);
}

footer { background: var(--panel); border-top: 1px solid var(--border); padding: 10px 40px; display: flex; align-items: center; justify-content: space-between; flex-shrink: 0; font-family: var(--font-diagram); font-size: 0.75rem; color: var(--text-dim); gap: 10px; }
.footer-status { display: flex; align-items: center; gap: 15px; }
.status-indicator { display: flex; align-items: center; gap: 6px; color: var(--accent-green); }
.dot { width: 8px; height: 8px; background: var(--accent-green); border-radius: 50%; box-shadow: 0 0 10px var(--accent-green); animation: pulse 1.5s infinite ease-in-out; }

@media (max-width: 768px) {
    header { flex-direction: column; padding: 15px 20px; align-items: flex-start; text-align: left; }
    .header-title { font-size: 1.1rem; flex-direction: row; align-items: center; gap: 10px; }
    .logo-wrapper { height: 1.5rem; }
    .nav-menu { width: 100%; justify-content: flex-start; overflow-x: auto; gap: 15px; }
    .nav-item { padding: 6px 0; font-size: 0.75rem; }
    .main-content { padding: 10px 15px; }
    footer { flex-direction: column; padding: 15px 20px; height: auto; text-align: left; align-items: flex-start; }
    .footer-status { flex-direction: column; gap: 5px; align-items: flex-start; }
    .footer-status span { display: none; }
}

/* =======================================================
   PIPELINE ANIMATION
   ======================================================= */
svg rect[stroke], svg circle[stroke], svg ellipse[stroke], svg polygon[stroke] { 
    animation: none !important; 
    stroke-dasharray: none !important; 
}

/* DIAGRAM STROKE ANIMATION - Mapping to CSS Variables */
#STEAM_LINES path, #ELECT_LINES path, #WATER_LINES path, #COMP_LINES path,
svg [stroke="#0066FF"], /* --diagram-blue */ 
svg [stroke="#41BA4F"], /* --diagram-grass */ 
svg [stroke="#D37FCC"], /* --diagram-purple */ 
svg [stroke="#7F3779"], /* --diagram-purple-dark */ 
svg [stroke="#D63C3C"], /* --diagram-power */ 
svg [stroke="#DB7241"], /* building color */ 
svg [stroke="#FFF600"], /* --diagram-steam */ 
svg [stroke="#977A58"], /* --diagram-brown1 */ 
svg [stroke="#806341"], /* --diagram-brown2 */ 
svg [stroke="#75EA83"], /* --diagram-lime */ 
svg [stroke="#90EAE6"], /* --diagram-light-cyan */ 
svg [stroke="#41B9B1"], /* --diagram-water */ 
svg [stroke="#24742F"], /* --diagram-air */ 
svg [stroke="#FFA500"], /* --diagram-crude */ 
svg [stroke="#FF4500"], /* --diagram-vapor */ 
svg [stroke="#FFD700"] /* --diagram-products */ {
    stroke-dasharray: 30 10 !important;
    animation: figmaDashFlow 4s linear infinite !important;
    will-change: stroke-dashoffset;
}

@keyframes figmaDashFlow { 
    from { stroke-dashoffset: 0; } 
    to { stroke-dashoffset: -240; } 
}

/* =======================================================
   VISUAL EFFECTS: GLOW, RISE, SPIN
   ======================================================= */
.furnace-glow { 
    animation: glowFurnace 2.5s infinite alternate ease-in-out !important; 
    transform-box: fill-box;
    transform-origin: center;
}
@keyframes glowFurnace { 
    0% { filter: brightness(0.8) drop-shadow(0 0 10px var(--color-overlay-orange)); opacity: 0.85; } 
    100% { filter: brightness(1.3) drop-shadow(0 0 50px var(--diagram-glow)); opacity: 1; } 
}

.smoke-anim { 
    transform-box: fill-box; 
    transform-origin: center; 
    animation: smokeRise 4s infinite ease-in forwards !important; 
}
@keyframes smokeRise { 
    0% { transform: translateY(0) scale(0.6); opacity: 0; } 
    20% { opacity: 0.7; } 
    100% { transform: translateY(-500px) scale(3); opacity: 0; } 
}

.fan-spin { 
    animation: spinFan 2.5s linear infinite !important; 
    transform-box: fill-box !important; 
    transform-origin: 50% 50% !important; 
}
@keyframes spinFan { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

/* =======================================================
   PHYSICS SIMULATION PORTFOLIO
   ======================================================= */

.portfolio-physics-section {
  padding-bottom: 40px;
}

.physics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 25px;
}

.physics-card {
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: all 0.3s ease;
}

.physics-card:hover {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 25px var(--color-overlay-cyan);
  transform: translateY(-3px);
}

.physics-card h3 {
  font-family: var(--font-text);
  color: var(--accent-cyan);
  font-size: 1rem;
  letter-spacing: 1px;
}

.physics-card p {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.6;
}

.physics-canvas-placeholder {
  height: 160px;
  background: var(--color-black);
  border: 1px dashed var(--border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-diagram);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.physics-formula {
  margin-top: auto;
  padding-top: 10px;
  border-top: 1px solid var(--color-overlay-white-md);
  font-family: var(--font-formula);
  font-style: italic;
  font-size: 0.9rem;
  color: var(--accent-yellow);
}

/* --- POPUP TOOLTIP --- */
.info-popup {
  position: fixed;
  background: var(--color-overlay-dark-98);
  backdrop-filter: blur(12px);
  border: 1px solid var(--accent-blue);
  border-radius: 8px;
  padding: 16px;
  max-width: 280px;
  font-size: 0.85rem;
  color: var(--color-white);
  z-index: 99999;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s;
}
.info-popup-title {
  display: inline-block;
  background: var(--color-overlay-blue-md);
  color: var(--accent-cyan);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 10px;
}
.info-popup-body {
  font-size: 0.85rem;
  color: var(--text);
  line-height: 2;
}
.info-popup.visible { opacity: 1; }

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

/* --- FOOTER LINK --- */
.footer-link {
  color: var(--accent-blue);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  border-bottom: 1px dashed transparent;
}

.footer-link:hover {
  color: var(--color-white);
  text-shadow: 0 0 2px var(--accent-blue);
  border-bottom: 1px dashed var(--accent-blue);
}

/* ==== FORCE ZOOM BUTTON VISIBILITY ==== */
.zoom-controls {
  position: absolute;
  right: 20px;
  bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 9999;
}

.zoom-btn {
  all: unset; /* ⬅️ INI PENTING: reset inheritance */

  width: 40px;
  height: 40px;

  display: flex;
  align-items: center;
  justify-content: center;

  background-color: var(--color-overlay-dark-95);
  border: 1px solid var(--accent-blue);
  border-radius: 6px;

  color: var(--accent-blue) !important;
  font-size: 22px !important;
  font-weight: 800;
  line-height: 1;

  font-family: system-ui, -apple-system, BlinkMacSystemFont,
               "Segoe UI", Arial, sans-serif !important;

  cursor: pointer;
  user-select: none;
}

.zoom-btn:hover {
  background-color: var(--accent-blue);
  color: var(--color-black) !important;
}

/* RESPONSIVE DESIGN */
@media (max-width: 768px) {
  header { padding: 10px 20px; }
  .header-title { font-size: 1.1rem; }
  .main-content { padding: 15px 20px; }
  .hero-section {
    flex-direction: column;
    justify-content: center;
    text-align: center;
    padding-top: 60px;
  }
  .hero-title { font-size: 2.5rem; }
  .hero-subtitle { font-size: 1.1rem; }
  .hero-animation {
    margin-top: 30px;
    width: 300px;
    height: 300px;
  }
  .projects-grid { grid-template-columns: 1fr; gap: 30px; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .section-container { padding: 0; }
}

@media (max-width: 480px) {
  .hero-animation { display: none; }
  .hero-title { font-size: 2rem; }
  .hero-subtitle { font-size: 1rem; }
  .cta-btn { padding: 14px 28px; font-size: 1rem; }
  .project-info { padding: 20px; }
  .project-info h3 { font-size: 1.2rem; }
}

/* PAGE TITLE */
.page-title { font-size: 2.5rem; font-weight: 800; color: var(--text); text-align: left; margin-bottom: 20px; margin-top: 100px; }
.section-description { font-size: 1.2rem; color: var(--text-dim); text-align: left; max-width: 600px; margin: 0 0 40px 0; line-height: 1.5; }