/* =============================================
   CSS Custom Properties
   ============================================= */
:root {
  --bg-primary:    #0a0e1a;
  --bg-secondary:  #0f1526;
  --bg-card:       #141b2d;
  --bg-card-hover: #1a2340;
  --accent:        #00b4d8;
  --accent-dark:   #0096b4;
  --accent-glow:   rgba(0, 180, 216, 0.18);
  --text-primary:  #e8eaf6;
  --text-secondary:#94a3b8;
  --text-muted:    #5a6a85;
  --border:        rgba(255, 255, 255, 0.07);
  --border-accent: rgba(0, 180, 216, 0.35);
  --nav-height:    70px;
  --radius:        12px;
  --radius-lg:     20px;
  --shadow:        0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-accent: 0 0 30px rgba(0, 180, 216, 0.25);
  --transition:    0.3s ease;
  --font:          'Poppins', sans-serif;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a   { text-decoration: none; color: inherit; }
ul  { list-style: none; }

/* =============================================
   Utilities
   ============================================= */
.accent { color: var(--accent); }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 100px 0;
}
.section-alt {
  background-color: var(--bg-secondary);
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}
.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 3.5rem;
  font-size: 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.6rem;
  border-radius: 8px;
  font-family: var(--font);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
}
.btn-primary {
  background: var(--accent);
  color: #000;
}
.btn-primary:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-accent);
}
.btn-outline {
  border-color: var(--accent);
  color: var(--accent);
  background: transparent;
}
.btn-outline:hover {
  background: var(--accent-glow);
  transform: translateY(-2px);
}
.btn-full { width: 100%; justify-content: center; }

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* =============================================
   Navbar
   ============================================= */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition);
}
.navbar.scrolled {
  background: rgba(10, 14, 26, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 2px 20px rgba(0,0,0,0.4);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.nav-links {
  display: flex;
  gap: 2.2rem;
}
.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  transition: color var(--transition);
}
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -4px;
  width: 0; height: 2px;
  background: var(--accent);
  transition: width var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
}
.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =============================================
   Hero
   ============================================= */
.hero {
  min-height: 100vh;
  padding: calc(var(--nav-height) + 60px) 1.5rem 80px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr auto;
  align-items: center;
  gap: 3rem;
  max-width: 1100px;
  margin: 0 auto;
  position: relative;
}

.hero-bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,180,216,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,180,216,0.04) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  z-index: 0;
}

.hero-content,
.hero-visual { position: relative; z-index: 1; }

.hero-greeting {
  color: var(--accent);
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, #e8eaf6 40%, var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  font-weight: 500;
  color: var(--text-secondary);
  min-height: 2rem;
  margin-bottom: 1.25rem;
}
.cursor {
  display: inline-block;
  color: var(--accent);
  animation: blink 1s step-end infinite;
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0} }

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

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Code card */
.code-card {
  background: var(--bg-card);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow), var(--shadow-accent);
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.88rem;
}
.code-card-header {
  background: var(--bg-card-hover);
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  border-bottom: 1px solid var(--border);
}
.dot {
  width: 12px; height: 12px;
  border-radius: 50%;
}
.dot.red    { background: #ff5f57; }
.dot.yellow { background: #ffbd2e; }
.dot.green  { background: #28c840; }
.code-filename {
  margin-left: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.8rem;
}
.code-body {
  padding: 1.5rem;
  line-height: 1.9;
  color: var(--text-primary);
  white-space: pre;
}
.kw  { color: #c792ea; }
.fn  { color: #82aaff; }
.dec { color: var(--accent); }
.str { color: #c3e88d; }
.op  { color: #89ddff; }
.cm  { color: var(--text-muted); }

/* Scroll down arrow */
.scroll-down {
  grid-column: 1 / -1;
  justify-self: center;
  color: var(--text-muted);
  font-size: 1.2rem;
  animation: bounce 2s infinite;
  transition: color var(--transition);
}
.scroll-down:hover { color: var(--accent); }
@keyframes bounce {
  0%,100%{transform:translateY(0)} 50%{transform:translateY(8px)}
}

/* =============================================
   About
   ============================================= */
.about-grid {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 4rem;
  align-items: center;
}

.photo-wrapper {
  position: relative;
  width: 220px;
  height: 220px;
  margin: 0 auto;
}
.photo-placeholder {
  width: 220px; height: 220px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--bg-card), var(--bg-card-hover));
  border: 3px solid var(--border-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  color: var(--accent);
  box-shadow: var(--shadow-accent);
}
.photo-ring {
  position: absolute;
  inset: -12px;
  border-radius: 50%;
  border: 2px dashed var(--border-accent);
  animation: spin 20s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.about-text h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 1rem;
}
.about-text p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.about-stats {
  display: flex;
  gap: 2.5rem;
  margin: 1.75rem 0;
}
.stat { display: flex; flex-direction: column; }
.stat-number {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
}
.stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* =============================================
   Skills
   ============================================= */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2rem;
}

.skill-category {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.skill-category:hover {
  border-color: var(--border-accent);
  box-shadow: var(--shadow-accent);
}
.skill-category h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.skill-item { margin-bottom: 1.2rem; }
.skill-info {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
  font-size: 0.88rem;
  font-weight: 500;
}
.skill-info i {
  font-size: 1rem;
  color: var(--accent);
  width: 18px;
  text-align: center;
}
.skill-pct {
  margin-left: auto;
  color: var(--text-muted);
  font-size: 0.78rem;
}

.skill-bar {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}
.skill-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-dark), var(--accent));
  border-radius: 3px;
  width: 0;
  transition: width 1s ease;
}

/* =============================================
   Projects
   ============================================= */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden; /* Ensure image doesn't overflow rounded corners */
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.project-card-content {
  padding: 1.5rem 2rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  flex: 1;
}

.project-img-wrapper {
  width: 100%;
  height: 200px;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

.project-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.project-card:hover .project-img {
  transform: scale(1.05);
}
.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-accent);
  box-shadow: var(--shadow-accent);
}

.project-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}
.project-icon {
  font-size: 2rem;
  color: var(--accent);
}

.project-links {
  display: flex;
  gap: 0.75rem;
}
.icon-link {
  color: var(--text-muted);
  font-size: 1.1rem;
  transition: color var(--transition);
}
.icon-link:hover { color: var(--accent); }

.project-title {
  font-size: 1.1rem;
  font-weight: 700;
}
.project-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  flex: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.tag {
  background: rgba(0,180,216,0.1);
  color: var(--accent);
  border: 1px solid var(--border-accent);
  border-radius: 4px;
  padding: 0.2rem 0.6rem;
  font-size: 0.75rem;
  font-weight: 500;
}

/* =============================================
   Contact
   ============================================= */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 4rem;
  align-items: start;
}

.contact-info h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}
.contact-info > p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.contact-links { display: flex; flex-direction: column; gap: 1rem; }
.contact-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.9rem 1.1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.contact-link:hover {
  border-color: var(--border-accent);
  box-shadow: var(--shadow-accent);
}
.contact-icon {
  width: 42px; height: 42px;
  background: var(--accent-glow);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 1.1rem;
  flex-shrink: 0;
}
.contact-link span:last-child {
  display: flex;
  flex-direction: column;
}
.contact-link strong { font-size: 0.9rem; }
.contact-link small { color: var(--text-muted); font-size: 0.78rem; }

/* Contact form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.form-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}
.form-group input,
.form-group textarea {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-family: var(--font);
  font-size: 0.9rem;
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  resize: vertical;
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0,180,216,0.12);
}
.form-group input.error,
.form-group textarea.error {
  border-color: #f87171;
}

.form-error {
  font-size: 0.78rem;
  color: #f87171;
  min-height: 1rem;
}

.form-status {
  text-align: center;
  font-size: 0.88rem;
  min-height: 1.2rem;
}
.form-status.success { color: #34d399; }
.form-status.error-msg { color: #f87171; }

/* =============================================
   Footer
   ============================================= */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
  padding: 2rem 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-logo {
  font-size: 1.4rem;
  font-weight: 800;
}
.footer-copy {
  color: var(--text-muted);
  font-size: 0.85rem;
}
.footer-social {
  display: flex;
  gap: 1rem;
}
.footer-social a {
  color: var(--text-muted);
  font-size: 1.1rem;
  transition: color var(--transition);
}
.footer-social a:hover { color: var(--accent); }

/* =============================================
   Responsive
   ============================================= */
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    padding-top: calc(var(--nav-height) + 40px);
  }
  .hero-intro { margin: 0 auto 2rem; }
  .hero-cta { justify-content: center; }
  .hero-visual { order: -1; }
  .code-card { max-width: 420px; margin: 0 auto; }
  .scroll-down { display: none; }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
    text-align: center;
  }
  .about-stats { justify-content: center; }
  .about-text .btn { margin: 0 auto; }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 640px) {
  .section { padding: 70px 0; }

  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0; right: 0;
    background: rgba(10, 14, 26, 0.98);
    flex-direction: column;
    align-items: center;
    padding: 2rem 0;
    gap: 1.5rem;
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(12px);
  }
  .nav-links.open { display: flex; }
  .nav-links a { font-size: 1.05rem; }

  .hamburger { display: flex; }

  .hero-name { font-size: 2.4rem; }
  .hero-cta { flex-direction: column; align-items: center; }
  .code-body { font-size: 0.78rem; padding: 1rem; }

  .footer-inner { flex-direction: column; align-items: center; text-align: center; }
}