/* ===========================
   CSS Custom Properties
   =========================== */
:root {
  --clr-bg: #0d1117;
  --clr-surface: #161b22;
  --clr-surface-2: #21262d;
  --clr-border: #30363d;
  --clr-text: #e6edf3;
  --clr-text-muted: #8b949e;
  --clr-accent: #58a6ff;
  --clr-accent-2: #bc8cff;
  --clr-accent-hover: #79b8ff;
  --nav-height: 68px;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --transition: 0.25s ease;
  --max-width: 1100px;
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'Fira Code', 'Cascadia Code', monospace;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-main);
  background-color: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }

a { color: inherit; text-decoration: none; }

ul { list-style: none; }

/* ===========================
   Utility
   =========================== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.accent { color: var(--clr-accent); }

.section-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--clr-accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-subtitle {
  color: var(--clr-text-muted);
  font-size: 1.05rem;
  max-width: 560px;
  margin-bottom: 56px;
}

/* ===========================
   Buttons
   =========================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-main);
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--clr-accent);
  color: #0d1117;
  border-color: var(--clr-accent);
}

.btn-primary:hover {
  background: var(--clr-accent-hover);
  border-color: var(--clr-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(88, 166, 255, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--clr-text);
  border-color: var(--clr-border);
}

.btn-outline:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent);
  transform: translateY(-2px);
}

.btn-full { width: 100%; justify-content: center; }

/* ===========================
   Navigation
   =========================== */
.nav-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  border-bottom: 1px solid transparent;
  transition: background var(--transition), border-color var(--transition), backdrop-filter var(--transition);
}

.nav-header.scrolled {
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-color: var(--clr-border);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--clr-accent);
  padding: 6px 12px;
  border: 1px solid var(--clr-accent);
  border-radius: 6px;
  transition: all var(--transition);
}

.nav-logo:hover {
  background: var(--clr-accent);
  color: var(--clr-bg);
}

.nav-links {
  display: flex;
  gap: 36px;
  align-items: center;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--clr-text-muted);
  transition: color var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--clr-accent);
  transform: scaleX(0);
  transition: transform var(--transition);
  border-radius: 2px;
}

.nav-links a:hover,
.nav-links a.active { color: var(--clr-text); }

.nav-links a:hover::after,
.nav-links a.active::after { transform: scaleX(1); }

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--clr-text);
  border-radius: 2px;
  transition: all var(--transition);
}

.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===========================
   Hero
   =========================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-height) + 40px) 24px 80px;
  overflow: hidden;
}

.hero-content {
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  position: relative;
  z-index: 1;
}

.hero-greeting {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--clr-accent);
  margin-bottom: 8px;
  opacity: 0;
  animation: fadeUp 0.6s ease 0.1s forwards;
}

.hero-name {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--clr-text) 0%, var(--clr-text-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  opacity: 0;
  animation: fadeUp 0.6s ease 0.2s forwards;
}

.hero-tagline {
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  font-weight: 600;
  color: var(--clr-accent-2);
  margin-bottom: 20px;
  opacity: 0;
  animation: fadeUp 0.6s ease 0.3s forwards;
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--clr-text-muted);
  max-width: 480px;
  margin-bottom: 40px;
  opacity: 0;
  animation: fadeUp 0.6s ease 0.4s forwards;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.6s ease 0.5s forwards;
}

/* Decorative blobs */
.hero-decoration {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.15;
}

.blob-1 {
  width: 500px;
  height: 500px;
  background: var(--clr-accent);
  top: -100px;
  right: -100px;
  animation: blobFloat 8s ease-in-out infinite;
}

.blob-2 {
  width: 400px;
  height: 400px;
  background: var(--clr-accent-2);
  bottom: 0;
  right: 30%;
  animation: blobFloat 10s ease-in-out 2s infinite reverse;
}

/* Scroll indicator */
.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  opacity: 0;
  animation: fadeIn 0.6s ease 1s forwards;
}

.scroll-arrow {
  display: block;
  width: 20px;
  height: 20px;
  border-right: 2px solid var(--clr-text-muted);
  border-bottom: 2px solid var(--clr-text-muted);
  transform: rotate(45deg);
  animation: scrollBounce 1.5s ease-in-out infinite;
}

/* ===========================
   About
   =========================== */
.about {
  padding: 100px 0;
  background: var(--clr-surface);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 64px;
  align-items: center;
}

.about-image-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.about-image-placeholder {
  width: 100%;
  max-width: 300px;
  aspect-ratio: 1;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--clr-surface-2) 0%, #1c2333 100%);
  border: 1px solid var(--clr-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-accent);
  position: relative;
  overflow: hidden;
}

.about-image-placeholder::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: linear-gradient(135deg, var(--clr-accent), var(--clr-accent-2));
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask-composite: exclude;
  -webkit-mask-composite: xor;
  padding: 1px;
  opacity: 0.4;
}

.about-image-placeholder svg {
  width: 70%;
  height: 70%;
}

.about-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.skill-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 4px 12px;
  border-radius: 100px;
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border);
  color: var(--clr-text-muted);
  transition: all var(--transition);
}

.skill-tag:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent);
}

.about-text h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: 24px;
}

.about-text p {
  color: var(--clr-text-muted);
  margin-bottom: 16px;
  font-size: 1rem;
}

.about-text .btn { margin-top: 8px; }

/* ===========================
   Projects
   =========================== */
.projects {
  padding: 100px 0;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

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

.project-image {
  position: relative;
  height: 200px;
  background: var(--img-grad);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.project-image-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
}

.project-icon {
  width: 120px;
  height: 90px;
  transition: transform var(--transition);
}

.project-card:hover .project-icon {
  transform: scale(1.08);
}

.project-links {
  position: absolute;
  top: 12px;
  right: 12px;
  display: flex;
  gap: 8px;
  opacity: 0;
  transform: translateY(-4px);
  transition: all var(--transition);
}

.project-card:hover .project-links {
  opacity: 1;
  transform: translateY(0);
}

.project-link {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: rgba(13, 17, 23, 0.7);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  transition: background var(--transition);
}

.project-link:hover { background: rgba(13, 17, 23, 0.95); }

.project-link svg { width: 16px; height: 16px; }

.project-content { padding: 24px; }

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.project-tags span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: 100px;
  background: rgba(88, 166, 255, 0.1);
  color: var(--clr-accent);
  border: 1px solid rgba(88, 166, 255, 0.2);
}

.project-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 10px;
  line-height: 1.4;
}

.project-content p {
  font-size: 0.9rem;
  color: var(--clr-text-muted);
  line-height: 1.65;
}

/* ===========================
   Contact
   =========================== */
.contact {
  padding: 100px 0;
  background: var(--clr-surface);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  border-radius: var(--radius);
  border: 1px solid var(--clr-border);
  background: var(--clr-surface-2);
  transition: all var(--transition);
}

.contact-item:hover {
  border-color: var(--clr-accent);
  transform: translateX(4px);
}

.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(88, 166, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-accent);
  flex-shrink: 0;
}

.contact-icon svg { width: 20px; height: 20px; }

.contact-label {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
  margin-bottom: 2px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.contact-value {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--clr-text);
}

/* Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--clr-text-muted);
}

.form-group input,
.form-group textarea {
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border);
  border-radius: 8px;
  padding: 12px 16px;
  color: var(--clr-text);
  font-family: var(--font-main);
  font-size: 0.95rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  resize: vertical;
  outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--clr-text-muted); opacity: 0.6; }

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--clr-accent);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.12);
}

.form-note {
  font-size: 0.85rem;
  color: var(--clr-accent);
  text-align: center;
  min-height: 20px;
}

/* ===========================
   Footer
   =========================== */
.footer {
  padding: 28px 0;
  border-top: 1px solid var(--clr-border);
  text-align: center;
}

.footer p {
  font-size: 0.85rem;
  color: var(--clr-text-muted);
}

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

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes blobFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%       { transform: translate(20px, -20px) scale(1.05); }
  66%       { transform: translate(-15px, 15px) scale(0.97); }
}

@keyframes scrollBounce {
  0%, 100% { transform: rotate(45deg) translateY(0); }
  50%       { transform: rotate(45deg) translateY(6px); }
}

/* Reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ===========================
   Responsive — Tablet
   =========================== */
@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-image-wrap {
    flex-direction: row;
    align-items: flex-start;
    gap: 32px;
  }

  .about-image-placeholder {
    max-width: 200px;
    flex-shrink: 0;
  }

  .about-skills { justify-content: flex-start; }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

/* ===========================
   Responsive — Mobile
   =========================== */
@media (max-width: 640px) {
  :root { --nav-height: 60px; }

  .nav-toggle { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(13, 17, 23, 0.97);
    backdrop-filter: blur(12px);
    flex-direction: column;
    gap: 0;
    border-bottom: 1px solid var(--clr-border);
    padding: 8px 0;
  }

  .nav-links.open { display: flex; }

  .nav-links a {
    padding: 14px 24px;
    font-size: 1rem;
    width: 100%;
  }

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

  .hero {
    padding: calc(var(--nav-height) + 24px) 24px 60px;
  }

  .hero-actions { flex-direction: column; align-items: flex-start; }

  .about { padding: 72px 0; }

  .about-image-wrap { flex-direction: column; align-items: center; }

  .about-image-placeholder { max-width: 220px; }

  .projects { padding: 72px 0; }

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

  .contact { padding: 72px 0; }

  .contact-info { gap: 12px; }
}