:root {
  /* Default Light Mode "Normal" Flow */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --accent-primary: #4f46e5;
  --accent-secondary: #6366f1;
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(0, 0, 0, 0.05);
  --success: #10b981;
  --spotlight-x: 50%;
  --spotlight-y: 50%;
  --spotlight-radius: 150px;
}

[data-theme="dark"] {
  /* Scanner/Dark Mode "Crazy" Flow */
  --bg-primary: #020617;
  --bg-secondary: #0f172a;
  --accent-primary: #6366f1;
  --accent-secondary: #818cf8;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --glass-bg: rgba(255, 255, 255, 0.03);
  --glass-border: rgba(255, 255, 255, 0.1);
}

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

/* Spotlight Overlay (Only in Dark Mode) */
.spotlight-reveal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  pointer-events: none;
  z-index: 9999;
  opacity: 0;
  display: none;
  mask-image: radial-gradient(
    circle var(--spotlight-radius) at var(--spotlight-x) var(--spotlight-y),
    transparent 100%,
    black 100%
  );
  -webkit-mask-image: radial-gradient(
    circle var(--spotlight-radius) at var(--spotlight-x) var(--spotlight-y),
    transparent 100%,
    black 100%
  );
  transition: opacity 0.5s ease;
}

[data-theme="dark"] .spotlight-reveal-overlay {
  opacity: 1;
  display: block;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3 {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
}

/* Glassmorphism utility */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
}

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

/* Hero Section */
header {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

/* Background elements */
.blob {
  position: absolute;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--accent-primary) 0%, transparent 70%);
  filter: blur(60px);
  opacity: 0.3;
  z-index: -1;
  animation: float 20s infinite linear;
}

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

.hero-content {
  text-align: center;
  animation: fadeIn 1s ease-out;
}

.hero-portrait-wrapper {
  position: relative;
  display: inline-block;
  margin-bottom: 2rem;
}

.hero-portrait {
  width: 240px;
  height: 240px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--accent-primary);
  box-shadow: 0 0 30px rgba(99, 102, 241, 0.4);
}

.hero-title {
  font-size: 4rem;
  margin-bottom: 0.5rem;
  background: linear-gradient(to right, #fff, var(--accent-primary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.cta-group {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

.btn {
  padding: 12px 28px;
  border-radius: 99px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: #fff;
}

.btn-primary:hover {
  background-color: var(--accent-secondary);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(99, 102, 241, 0.3);
}

.btn-outline {
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  background: var(--glass-bg);
}

.btn-outline:hover {
  background: var(--glass-border);
  transform: translateY(-2px);
}

/* Theme Switch UI */
.theme-switch-wrapper {
  position: fixed;
  top: 30px;
  right: 30px;
  display: flex;
  align-items: center;
  z-index: 10001;
  gap: 12px;
}

.mode-label {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--text-secondary);
}

.theme-switch {
  display: inline-block;
  height: 34px;
  position: relative;
  width: 60px;
}

.theme-switch input { display:none; }

.slider {
  background-color: #ccc;
  bottom: 0;
  cursor: pointer;
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
  transition: .4s;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 8px;
  color: #fff;
}

.slider:before {
  background-color: #fff;
  bottom: 4px;
  content: "";
  height: 26px;
  left: 4px;
  position: absolute;
  transition: .4s;
  width: 26px;
  z-index: 2;
}

input:checked + .slider {
  background-color: var(--accent-primary);
}

input:focus + .slider {
  box-shadow: 0 0 1px var(--accent-primary);
}

input:checked + .slider:before {
  transform: translateX(26px);
}

.slider.round { border-radius: 34px; }
.slider.round:before { border-radius: 50%; }

/* Vault Tunnel & Door (Only accessible in dark mode spotlight) */
.vault-tunnel-container {
  display: none;
  position: absolute;
  top: 15%;
  right: 10%;
  width: 400px;
  height: 400px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  transform: scale(0.6) perspective(1000px) rotateY(-30deg);
  z-index: 1000;
  border-radius: 50%;
  overflow: hidden;
  box-shadow: 0 0 100px rgba(99, 102, 241, 0.3);
}

[data-theme="dark"] .vault-tunnel-container {
  display: block;
}

.vault-tunnel-container.visible {
  opacity: 1;
  pointer-events: auto;
  transform: scale(1) perspective(1000px) rotateY(0deg);
}

.vault-door {
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Keypad Interface */
.keypad {
  width: 160px;
  padding: 15px;
  border-radius: 12px;
  border: 1px solid rgba(0, 210, 255, 0.3);
  background: rgba(2, 6, 23, 0.8);
  box-shadow: 0 0 20px rgba(0, 210, 255, 0.2);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.keypad-display {
  background: #000;
  color: var(--accent-primary);
  font-family: 'Fira Code', monospace;
  font-size: 0.7rem;
  padding: 8px;
  text-align: center;
  border-radius: 4px;
  border: 1px solid rgba(0, 210, 255, 0.1);
  min-height: 30px;
}

.keypad-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.key {
  all: unset;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #fff;
  padding: 8px;
  text-align: center;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.8rem;
  transition: all 0.2s ease;
}

.key:hover {
  background: rgba(0, 210, 255, 0.2);
  border-color: var(--citizen-blue);
  box-shadow: 0 0 10px rgba(0, 210, 255, 0.3);
}

.key:active { transform: scale(0.95); }

.action-key {
  background: rgba(99, 102, 241, 0.1);
}

#enterBtn:hover { background: var(--success); }
#clearBtn:hover { background: #ef4444; }

/* Portfolio Grid */
section {
  padding: 100px 0;
}

.section-label {
  color: var(--accent-primary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 1rem;
  display: block;
  text-align: center;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 4rem;
  text-align: center;
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
}

.project-card {
  position: relative;
  padding: 24px;
  transition: all 0.3s ease;
  cursor: pointer;
  overflow: visible;
}

.project-card:hover {
  transform: translateY(-10px);
  border-color: var(--accent-primary);
}

.project-tag {
  font-size: 0.75rem;
  color: var(--accent-primary);
  font-weight: 700;
  margin-bottom: 0.5rem;
  display: block;
}

.project-name {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.project-description {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

/* Hover Screenshot Magic */
.screenshot-preview {
  position: fixed;
  width: 350px;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.5);
  pointer-events: none;
  z-index: 1000;
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.3s ease, transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  background: var(--bg-secondary);
  border: 1px solid var(--accent-primary);
  overflow: hidden;
}

.screenshot-preview img {
  width: 100%;
  height: auto;
  display: block;
}

.screenshot-preview.visible {
  opacity: 1;
  transform: scale(1);
}

/* Certificates Section */
.certificate-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.5rem;
}

.cert-card {
  padding: 20px;
  text-align: center;
  transition: all 0.3s ease;
}

.cert-card:hover {
  background: var(--glass-border);
}

.cert-icon {
  font-size: 2rem;
  color: #fbbf24;
  margin-bottom: 1rem;
}

/* Footer */
footer {
  padding: 60px 0;
  text-align: center;
  border-top: 1px solid var(--glass-border);
  color: var(--text-secondary);
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease-out;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 768px) {
  .hero-title { font-size: 2.5rem; }
  .portfolio-grid { grid-template-columns: 1fr; }
}