/* ==========================================================================
   VARIABLES & THEME CONFIGURATION
   ========================================================================== */
:root {
  color-scheme: dark;
  --bg: #050810;
  --accent: #4f8ef7;
  --accent2: #7c5cbf;
  --text: #e8eaf0;
  --muted: #8090b0;
  --border: rgba(255, 255, 255, 0.1);
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-nav: rgba(5, 8, 16, 0.65);
  --blob1: #1a3a8f;
  --blob2: #2d1b69;
  --blob3: #0e4d7a;
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #0d1a35;
  --accent: #60a5fa;
  --accent2: #a78bfa;
  --text: #e2e8f8;
  --muted: #94a3c8;
  --border: rgba(255, 255, 255, 0.13);
  --glass-bg: rgba(255, 255, 255, 0.08);
  --glass-nav: rgba(13, 26, 53, 0.75);
  --blob1: #1e4fd8;
  --blob2: #5b21b6;
  --blob3: #0369a1;
}

/* ==========================================================================
   RESET & BASE STYLES (HARDWARE ACCELERATED)
   ========================================================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  touch-action: pan-y;
}

body {
  font-family:
    "Syne",
    -apple-system,
    BlinkMacSystemFont,
    sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
  touch-action: pan-y;
  transition:
    background 0.3s ease,
    color 0.3s ease;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   BACKGROUND CANVAS, BLOBS & OVERLAYS (OPTIMIZED)
   ========================================================================== */
#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  transform: translate3d(0, 0, 0);
  contain: strict;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.38;
  animation: floatBlob linear infinite;
  transform: translate3d(0, 0, 0);
  backface-visibility: hidden;
  pointer-events: none;
}

.blob-1 {
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, var(--blob1), #0a1a4a);
  top: -100px;
  left: -100px;
  animation-duration: 22s;
}

.blob-2 {
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, var(--blob2), #0d0720);
  top: 30%;
  right: -150px;
  animation-duration: 26s;
  animation-delay: -8s;
}

.blob-3 {
  width: 380px;
  height: 380px;
  background: radial-gradient(circle, var(--blob3), #020d1a);
  bottom: 10%;
  left: 20%;
  animation-duration: 20s;
  animation-delay: -5s;
}

.blob-4 {
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, #1e3a6e, #060f25);
  top: 60%;
  left: -80px;
  animation-duration: 24s;
  animation-delay: -12s;
}

.blob-5 {
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, #0d2d5e, #030810);
  top: 20%;
  left: 40%;
  animation-duration: 30s;
  animation-delay: -3s;
}

@keyframes floatBlob {
  0% {
    transform: translate3d(0, 0, 0);
  }
  25% {
    transform: translate3d(40px, -50px, 0);
  }
  50% {
    transform: translate3d(-30px, 40px, 0);
  }
  75% {
    transform: translate3d(50px, 25px, 0);
  }
  100% {
    transform: translate3d(0, 0, 0);
  }
}

#main-content,
#opening {
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   OPENING SCREEN / PRELOADER
   ========================================================================== */
#opening {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: #050810;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

#opening-text {
  font-family: "Outfit", sans-serif;
  font-size: clamp(1.8rem, 6vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  text-align: center;
  padding: 0 1rem;
  color: #ffffff;
  background: linear-gradient(180deg, #ffffff 0%, #e2e8f0 60%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  forced-color-adjust: none;
  filter: drop-shadow(0 2px 2px rgba(0, 0, 0, 0.8))
    drop-shadow(0 6px 20px rgba(79, 142, 247, 0.4));
}

#opening-text::after {
  content: "|";
  color: #4f8ef7;
  animation: blink 0.7s step-end infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

#opening-sub {
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: #8090b0;
  text-transform: uppercase;
  opacity: 0;
  transition: opacity 0.4s ease;
}

#opening.hide {
  opacity: 0;
  visibility: hidden;
  transform: scale(1.03);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease,
    visibility 0.6s ease;
  pointer-events: none;
}

#main-content {
  opacity: 0;
  transition: opacity 0.6s ease;
}

#main-content.show {
  opacity: 1;
}

/* ==========================================================================
   ANIMATIONS & TRANSITIONS (GPU ACCELERATED)
   ========================================================================== */
.fade-up {
  opacity: 0;
  transform: translate3d(0, 30px, 0);
  transition:
    opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.fade-up.visible {
  opacity: 1;
  transform: translate3d(0, 0, 0);
  will-change: auto;
}

.fade-up.d1 {
  transition-delay: 0.08s;
}
.fade-up.d2 {
  transition-delay: 0.16s;
}
.fade-up.d3 {
  transition-delay: 0.24s;
}
.fade-up.d4 {
  transition-delay: 0.32s;
}
.fade-up.d5 {
  transition-delay: 0.4s;
}

/* ==========================================================================
   NAVIGATION
   ========================================================================== */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  padding: 0.85rem 6%;
  background: var(--glass-nav);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s ease;
  transform: translate3d(0, 0, 0);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  max-width: 1300px;
  margin: 0 auto;
}

/* Left-aligned navigation menu on Desktop */
.nav-menu {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 2.2rem;
  margin: 0;
  padding: 0;
}

.nav-menu a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: color 0.25s ease;
  position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--accent);
}

/* Right-aligned action controls */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-left: auto;
}

/* Modern Theme Toggle Button (SVG Icon Transition) */
.theme-toggle-btn {
  background: var(--glass-bg);
  border: 1px solid var(--border);
  color: var(--text);
  width: 38px;
  height: 38px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
  transition:
    border-color 0.25s ease,
    transform 0.25s ease,
    box-shadow 0.25s ease;
  flex-shrink: 0;
}

.theme-toggle-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: scale(1.06);
  box-shadow: 0 0 14px rgba(79, 142, 247, 0.35);
}

.theme-toggle-btn .sun-icon,
.theme-toggle-btn .moon-icon {
  position: absolute;
  transition:
    transform 0.4s cubic-bezier(0.16, 1, 0.3, 1),
    opacity 0.3s ease;
}

/* Dark mode state: Moon visible */
[data-theme="dark"] .theme-toggle-btn .sun-icon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

[data-theme="dark"] .theme-toggle-btn .moon-icon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
  color: var(--accent);
}

/* Light mode state: Sun visible */
[data-theme="light"] .theme-toggle-btn .sun-icon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
  color: #f59e0b;
}

[data-theme="light"] .theme-toggle-btn .moon-icon {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}

/* Hamburger Menu Button (hidden on desktop) */
.hamburger-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--glass-bg);
  border: 1px solid var(--border);
  cursor: pointer;
  padding: 8px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
  transition:
    border-color 0.25s ease,
    transform 0.25s ease;
  flex-shrink: 0;
}

.hamburger-btn:hover {
  border-color: var(--accent);
}

.hamburger-btn .bar {
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition:
    transform 0.3s cubic-bezier(0.16, 1, 0.3, 1),
    opacity 0.25s ease,
    background-color 0.25s ease;
}

/* Hamburger active transformation to 'X' */
.hamburger-btn.open .bar-1 {
  transform: translateY(7px) rotate(45deg);
  background: var(--accent);
}

.hamburger-btn.open .bar-2 {
  opacity: 0;
  transform: scaleX(0);
}

.hamburger-btn.open .bar-3 {
  transform: translateY(-7px) rotate(-45deg);
  background: var(--accent);
}

/* ==========================================================================
   GLASSMORPHISM CARD COMPONENT
   ========================================================================== */
.glass {
  background: var(--glass-bg);
  border: 1px solid var(--border);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: 20px;
  padding: 2.2rem;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.12),
    0 8px 32px rgba(0, 0, 0, 0.3);
  contain: layout style paint;
  transition:
    background 0.3s ease,
    border 0.3s ease;
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
#hero {
  min-height: calc(100vh - 40px);
  display: flex;
  align-items: center;
  padding: 5rem 6% 2.5rem 6%;
  gap: 2rem;
  position: relative;
  overflow: hidden;
}

.hero-text {
  flex: 1;
  z-index: 1;
}

.hero-tag {
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.hero-name {
  font-family: "Outfit", sans-serif;
  font-size: clamp(2.2rem, 7vw, 4.2rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin-bottom: 0.6rem;
  color: #ffffff;
  background: linear-gradient(180deg, #ffffff 0%, #e2e8f0 55%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  forced-color-adjust: none;
  filter: drop-shadow(0 2px 0px rgba(0, 0, 0, 0.7))
    drop-shadow(0 4px 14px rgba(79, 142, 247, 0.35))
    drop-shadow(0 10px 28px rgba(0, 0, 0, 0.5));
}

.hero-role {
  font-family: "Syne", sans-serif;
  font-size: clamp(1.2rem, 2.5vw, 1.8rem);
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 1.5rem;
  letter-spacing: 0.01em;
  font-variant-numeric: tabular-nums;
  display: inline-block;
}

.hero-desc {
  color: var(--muted);
  max-width: 480px;
  font-size: 1rem;
  margin-bottom: 2rem;
}

.btn-group {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  padding: 0.75rem 1.8rem;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition:
    transform 0.2s ease,
    opacity 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  border: none;
}

.btn-primary:hover {
  opacity: 0.88;
  transform: translateY(-2px);
}

.btn-outline {
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.socials {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
}

.socials a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border);
  color: var(--muted);
  text-decoration: none;
  transition:
    border-color 0.2s ease,
    color 0.2s ease;
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.socials a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

#lottie-hero {
  flex: 0 0 380px;
  width: 380px;
  height: 380px;
  z-index: 1;
}

/* ==========================================================================
   GENERAL SECTIONS & ABOUT SECTION
   ========================================================================== */
section {
  padding: 3.5rem 6%;
  position: relative;
  z-index: 1;
}

.section-label {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}

.section-title {
  font-family: "Syne", sans-serif;
  font-size: clamp(1.2rem, 3vw, 2.1rem);
  font-weight: 700;
  margin-bottom: 1rem;
}

.about-inner {
  display: flex;
  align-items: center;
  gap: 3.5rem;
}

.about-inner p {
  flex: 1;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.8;
  text-align: justify;
  text-justify: inter-word;
}

/* ==========================================================================
   ABOUT PHOTO COMPONENT
   ========================================================================== */
.about-photo-wrapper {
  flex: 0 0 240px;
  display: flex;
  justify-content: center;
  align-items: center;
  contain: layout style paint;
}

.about-photo {
  width: 240px;
  height: 290px;
  border-radius: 18px;
  object-fit: cover;
  display: block;
  border: 1px solid var(--border);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.15),
    0 12px 36px rgba(0, 0, 0, 0.35);
  transition:
    transform 0.3s ease,
    border-color 0.3s ease,
    box-shadow 0.3s ease;
}

.about-photo:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 18px 45px rgba(79, 142, 247, 0.25);
}

/* ==========================================================================
   EDUCATION TOGGLE & TIMELINE
   ========================================================================== */
.edu-toggle-wrapper {
  margin-top: 1.5rem;
  text-align: center;
}

#edu-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 2rem;
  border-radius: 50px;
  background: var(--glass-bg);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: "Syne", sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
  transition:
    border-color 0.25s ease,
    color 0.25s ease,
    transform 0.2s ease;
}

#edu-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

#edu-toggle.open {
  border-color: var(--accent);
  color: var(--accent);
}

#edu-box {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition:
    max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1),
    opacity 0.35s ease,
    margin-top 0.35s ease;
  margin-top: 0;
}

#edu-box.open {
  max-height: 600px;
  opacity: 1;
  margin-top: 1.5rem;
}

.edu-timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 1.5rem;
}

.edu-item {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

.edu-line {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-shrink: 0;
  padding-top: 3px;
}

.edu-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  box-shadow: 0 0 12px rgba(79, 142, 247, 0.6);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.edu-item:hover .edu-dot {
  transform: scale(1.3);
}

.edu-connector {
  width: 2px;
  flex: 1;
  min-height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  margin-top: 4px;
  opacity: 0.4;
}

.edu-content {
  padding-bottom: 2rem;
  flex: 1;
}

.edu-year {
  font-size: 0.72rem;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 0.2rem;
}

.edu-name {
  font-family: "Syne", sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.edu-desc {
  font-size: 0.85rem;
  color: var(--muted);
}

/* ==========================================================================
   PROJECTS SECTION (HORIZONTAL SLIDER)
   ========================================================================== */
.section-header-flex {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 1.5rem;
  gap: 1rem;
}

.slider-controls {
  display: flex;
  gap: 0.6rem;
}

.slider-arrow {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--glass-bg);
  border: 1px solid var(--border);
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  flex-shrink: 0;
}

.slider-arrow:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: scale(1.08);
  box-shadow: 0 0 14px rgba(79, 142, 247, 0.35);
}

.slider-arrow:active {
  transform: scale(0.95);
}

.slider-arrow:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none;
  border-color: var(--border);
  color: var(--muted);
}

/* Horizontal Projects Slider Wrapper */
.projects-slider-wrapper {
  position: relative;
  width: 100%;
  contain: layout style paint;
}

.projects-slider {
  display: flex;
  gap: 1.5rem;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-x: contain;
  scroll-snap-stop: normal;
  padding: 0.5rem 0.2rem 1.4rem 0.2rem;
  scrollbar-width: thin;
  scrollbar-color: var(--accent) transparent;
}

/* Custom Sleek Scrollbar */
.projects-slider::-webkit-scrollbar {
  height: 6px;
}

.projects-slider::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.04);
  border-radius: 10px;
}

.projects-slider::-webkit-scrollbar-thumb {
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 10px;
}

.project-card {
  flex: 0 0 340px;
  max-width: 340px;
  scroll-snap-align: start;
  background: var(--glass-bg);
  border: 1px solid var(--border);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: 16px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.1),
    0 4px 24px rgba(0, 0, 0, 0.25);
  contain: layout style paint;
  transition:
    transform 0.25s ease,
    border-color 0.25s ease,
    box-shadow 0.25s ease;
  transform: translate3d(0, 0, 0);
}

.project-card:hover {
  transform: translate3d(0, -6px, 0);
  border-color: var(--accent);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.15),
    0 12px 40px rgba(79, 142, 247, 0.2);
}

.project-image {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
}

.project-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.project-body h3 {
  font-family: "Syne", sans-serif;
  font-size: 1.08rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.35;
}

.project-body p {
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.6;
  flex: 1;
}

.project-link {
  display: inline-block;
  margin-top: 1rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
  align-self: flex-start;
}

.project-link:hover {
  text-decoration: underline;
}

/* ==========================================================================
   CONTACT / REMINDER SECTION
   ========================================================================== */
#kontak {
  text-align: center;
}

#kontak > p {
  color: var(--muted);
  margin-bottom: 2rem;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.contact-chip {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.4rem;
  border-radius: 50px;
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
  transition:
    border-color 0.2s ease,
    color 0.2s ease;
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.contact-chip:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
footer {
  text-align: center;
  padding: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.8rem;
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   BACK TO TOP BUTTON
   ========================================================================== */
#back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 500;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: 0 4px 20px rgba(79, 142, 247, 0.4);
  opacity: 0;
  transform: translate3d(0, 20px, 0);
  transition:
    opacity 0.25s ease,
    transform 0.25s ease;
  pointer-events: none;
  will-change: transform, opacity;
}

#back-to-top.show {
  opacity: 1;
  transform: translate3d(0, 0, 0);
  pointer-events: all;
}

#back-to-top:hover {
  transform: translate3d(0, -3px, 0);
  box-shadow: 0 6px 25px rgba(79, 142, 247, 0.6);
}

/* ==========================================================================
   MOBILE PERFORMANCE & RESPONSIVE STYLES (@media <= 768px)
   ========================================================================== */
@media (max-width: 768px) {
  /* Fast GPU-efficient aura blobs on mobile */
  .blob {
    filter: blur(28px);
    opacity: 0.32;
    will-change: transform;
  }

  .blob-1 {
    width: 380px;
    height: 380px;
  }
  .blob-2 {
    width: 320px;
    height: 320px;
  }
  .blob-3 {
    width: 280px;
    height: 280px;
  }
  .blob-4 {
    width: 240px;
    height: 240px;
  }
  .blob-5 {
    width: 200px;
    height: 200px;
  }

  /* Lightweight Glass Navbar on Mobile */
  nav {
    padding: 0.75rem 5%;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    background: rgba(5, 8, 16, 0.92);
  }

  [data-theme="light"] nav {
    background: rgba(13, 26, 53, 0.92);
  }

  /* Show Hamburger Button on Left */
  .hamburger-btn {
    display: flex;
  }

  /* Mobile Dropdown Menu (Glass Card on Top-Left below hamburger) */
  .nav-menu {
    position: fixed;
    top: 66px;
    left: 5%;
    right: auto;
    width: 210px;
    background: rgba(5, 8, 16, 0.96);
    backdrop-filter: blur(14px) saturate(160%);
    -webkit-backdrop-filter: blur(14px) saturate(160%);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 1rem 0.8rem;
    flex-direction: column;
    align-items: stretch;
    gap: 0.4rem;
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.6);
    opacity: 0;
    transform: translateY(-12px) scale(0.95);
    pointer-events: none;
    transition:
      opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1),
      transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 1001;
  }

  [data-theme="light"] .nav-menu {
    background: rgba(13, 26, 53, 0.96);
  }

  /* Active Open State for Mobile Dropdown */
  .nav-menu.open {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
  }

  .nav-menu li {
    width: 100%;
  }

  .nav-menu a {
    display: block;
    padding: 0.7rem 1rem;
    border-radius: 10px;
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--muted);
    transition: all 0.2s ease;
  }

  .nav-menu a::after {
    display: none;
  }

  .nav-menu a:hover,
  .nav-menu a.active {
    color: #fff;
    background: rgba(79, 142, 247, 0.15);
  }

  /* Original Background Preserved on Mobile */
  .blob {
    filter: blur(28px);
    opacity: 0.35;
    animation: none !important; /* Static on mobile to prevent Android GPU lag */
  }

  .blob-1 {
    width: 340px;
    height: 340px;
  }
  .blob-2 {
    width: 300px;
    height: 300px;
  }
  .blob-3 {
    width: 250px;
    height: 250px;
  }
  .blob-4 {
    width: 220px;
    height: 220px;
  }
  .blob-5 {
    width: 190px;
    height: 190px;
  }

  /* Disable heavy GPU backdrop-filter on mobile cards to eliminate 100% of scroll stutter */
  .glass,
  .project-card,
  #edu-toggle,
  .contact-chip,
  .btn-outline,
  .socials a,
  .slider-arrow,
  .theme-toggle-btn,
  .hamburger-btn {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    background: rgba(12, 18, 34, 0.94) !important;
    border-color: rgba(255, 255, 255, 0.09) !important;
  }

  [data-theme="light"] .glass,
  [data-theme="light"] .project-card,
  [data-theme="light"] #edu-toggle,
  [data-theme="light"] .contact-chip,
  [data-theme="light"] .btn-outline,
  [data-theme="light"] .socials a,
  [data-theme="light"] .slider-arrow,
  [data-theme="light"] .theme-toggle-btn,
  [data-theme="light"] .hamburger-btn {
    background: rgba(18, 32, 64, 0.95) !important;
    border-color: rgba(255, 255, 255, 0.12) !important;
  }

  .glass {
    padding: 1.4rem;
  }

  .project-card {
    flex: 0 0 285px;
    max-width: 285px;
  }

  /* Section padding on Mobile */
  section {
    padding: 2.2rem 5%;
  }

  .fade-up {
    transform: translate3d(0, 16px, 0);
    transition:
      opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1),
      transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  }

  #hero {
    flex-direction: column;
    text-align: center;
    padding-top: 78px;
    gap: 1.2rem;
    min-height: auto;
    padding-bottom: 2rem;
  }

  .hero-name {
    color: #ffffff;
    forced-color-adjust: none;
    filter: drop-shadow(0 2px 8px rgba(79, 142, 247, 0.45));
  }

  #lottie-hero {
    flex: none;
    width: 220px;
    height: 220px;
  }

  .btn-group,
  .socials {
    justify-content: center;
  }

  /* About Section on Mobile: Photo on Top, Text below */
  .about-inner {
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
  }

  .about-inner p {
    text-align: justify;
    text-justify: inter-word;
  }

  .about-photo-wrapper {
    width: 100%;
    flex: none;
    display: flex;
    justify-content: center;
    order: -1;
  }

  .about-photo {
    width: 190px;
    height: 235px;
  }

  #back-to-top {
    bottom: 1.2rem;
    right: 1.2rem;
    width: 42px;
    height: 42px;
  }

  /* Faster touch response on Android */
  .btn,
  .socials a,
  .slider-arrow,
  .theme-toggle-btn,
  .hamburger-btn,
  #edu-toggle,
  #back-to-top {
    touch-action: manipulation;
  }
}

/* ==========================================================================
   BATTERY SAVER & REDUCED MOTION (ACCESSIBILITY OPTIMIZATION)
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}