:root {
  /* Colors */
  --bg-color: #06090f;
  --bg-alt: #090d18;
  --surface-color: #0d1424;
  --surface-hover: #131c30;
  --border-color: #1a2540;
  --border-hover: #253660;

  --primary-color: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.25);
  --accent-color: #22d3ee;
  --gradient-start: #818cf8;
  --gradient-end: #e879f9;

  --text-color: #dde3ed;
  --text-muted: #8898b0;
  --text-subtle: #4a5c78;

  /* Typography */
  --font-heading: "Outfit", sans-serif;
  --font-body: "Inter", sans-serif;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 8rem;

  /* Layout */
  --container-width: 1100px;
  --header-height: 72px;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
}

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

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

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: #fff;
  line-height: 1.2;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s ease;
}

ul { list-style: none; }
img { display: block; }

/* ─── Utilities ─────────────────────────────────── */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ─── Buttons ───────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 11px 26px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  font-family: var(--font-body);
  transition: all 0.2s ease;
  border: none;
  cursor: pointer;
  white-space: nowrap;
}

.btn:active { transform: scale(0.98); }

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color) 0%, #7c3aed 100%);
  color: white;
  box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-hover) 0%, #6d28d9 100%);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
  transform: translateY(-1px);
  color: white;
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--border-hover);
  color: var(--text-muted);
}

.btn-secondary:hover {
  border-color: var(--primary-color);
  color: var(--text-color);
  background: rgba(99, 102, 241, 0.07);
}

/* ─── Section Title ─────────────────────────────── */
.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-md);
  display: inline-block;
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 36px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  border-radius: 2px;
}

/* ─── Header ────────────────────────────────────── */
.header {
  height: var(--header-height);
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(6, 9, 15, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 1000;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

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

.logo {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-color);
}

.logo span {
  color: var(--primary-color);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
  transition: color 0.2s ease;
}

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

.lang-flag {
  height: 22px;
  width: 22px;
  vertical-align: middle;
  border-radius: 50%;
  object-fit: cover;
  opacity: 0.65;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.lang-flag:hover {
  opacity: 1;
  transform: scale(1.1);
}

/* ─── Hero ──────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  position: relative;
  overflow: hidden;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.022) 1px, transparent 1px);
  background-size: 64px 64px;
}

/* Radial glow */
.hero::before {
  content: '';
  position: absolute;
  top: 10%;
  left: -10%;
  width: 55vw;
  height: 55vw;
  max-width: 700px;
  max-height: 700px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.14) 0%, transparent 65%);
  pointer-events: none;
}

/* Bottom fade */
.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 220px;
  background: linear-gradient(to top, var(--bg-color), transparent);
  pointer-events: none;
  z-index: 1;
}

.hero .container {
  position: relative;
  z-index: 2;
}

.hero .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--primary-color);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--spacing-sm);
}

.hero .eyebrow::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 2px;
  background: var(--primary-color);
  border-radius: 2px;
  flex-shrink: 0;
}

.hero-title {
  font-size: clamp(2.75rem, 5vw, 4.75rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: var(--spacing-md);
}

.gradient-text {
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: var(--spacing-md);
  max-width: 500px;
  line-height: 1.75;
}

.hero-cta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ─── Sections ──────────────────────────────────── */
section {
  padding: var(--spacing-xl) 0;
}

/* ─── About ─────────────────────────────────────── */
.about-content {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-lg);
}

.profile-image-wrapper {
  width: 210px;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  padding: 3px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  flex-shrink: 0;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4), 0 0 0 6px rgba(99, 102, 241, 0.08);
}

.profile-image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

.about-text p {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.8;
}

.about-stats {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
}

.stat-number {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 700;
  color: #fff;
  line-height: 1;
  display: block;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-top: 0.3rem;
  display: block;
}

/* ─── Projects ──────────────────────────────────── */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary-color);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(99, 102, 241, 0.2);
}

.project-thumbnail {
  height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.project-card:nth-child(1) .project-thumbnail { background: linear-gradient(135deg, #0f1e0e 0%, #1a3a1a 50%, #0d2b2b 100%); }
.project-card:nth-child(2) .project-thumbnail { background: linear-gradient(135deg, #0e1a2e 0%, #1a2e4a 50%, #0e2040 100%); }
.project-card:nth-child(3) .project-thumbnail { background: linear-gradient(135deg, #1a0e2e 0%, #2a1a40 50%, #1a0a2e 100%); }
.project-card:nth-child(4) .project-thumbnail { background: linear-gradient(135deg, #0a1e1e 0%, #0d2f2a 50%, #081a20 100%); }

.project-thumbnail img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
  transition: transform 0.4s ease;
}

.project-card:hover .project-thumbnail img {
  transform: scale(1.05);
}

.project-thumbnail::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(0,0,0,0.15) 0%, rgba(0,0,0,0.4) 100%);
  z-index: 1;
  pointer-events: none;
}

.project-info {
  padding: 1.4rem 1.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.project-info h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--text-color);
}

.project-info p {
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.65;
  flex: 1;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1rem;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--primary-color);
  font-size: 0.8rem;
  font-weight: 600;
  margin-top: 0.9rem;
  transition: color 0.2s ease, gap 0.2s ease;
}

.project-link:hover {
  color: var(--gradient-start);
  gap: 0.55rem;
}

.tech-tags span {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.2rem 0.55rem;
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* ─── Contact ───────────────────────────────────── */
.contact {
  text-align: center;
}

.contact .container > p {
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: var(--spacing-md);
}

.contact-form {
  max-width: 560px;
  margin: 0 auto;
  text-align: left;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.45rem;
  color: var(--text-muted);
  font-size: 0.83rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 11px 14px;
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-color);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-subtle);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.contact-form .btn {
  width: 100%;
  margin-top: 0.5rem;
}

/* ─── Footer ────────────────────────────────────── */
.footer {
  padding: var(--spacing-md) 0;
  border-top: 1px solid var(--border-color);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-copy {
  color: var(--text-subtle);
  font-size: 0.83rem;
}

.footer-social {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.footer-social a {
  color: var(--text-subtle);
  transition: color 0.2s ease;
  display: flex;
  align-items: center;
}

.footer-social a:hover {
  color: var(--text-color);
}

/* ─── Mobile Menu ───────────────────────────────── */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 26px;
  height: 18px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 1001;
  padding: 0;
}

.mobile-menu-toggle .bar {
  width: 100%;
  height: 2px;
  background-color: var(--text-color);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.mobile-menu-toggle.active .bar:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.mobile-menu-toggle.active .bar:nth-child(2) { opacity: 0; }
.mobile-menu-toggle.active .bar:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ─── Responsive ────────────────────────────────── */
@media (max-width: 768px) {
  .mobile-menu-toggle { display: flex; }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 75%;
    max-width: 300px;
    height: 100vh;
    background: var(--surface-color);
    border-left: 1px solid var(--border-color);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2.25rem;
    transition: right 0.3s ease;
    z-index: 1000;
  }

  .nav-links.active {
    display: flex;
    right: 0;
  }

  .nav-links a {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-color);
  }

  .about-content {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .about-stats {
    justify-content: center;
  }

  .profile-image-wrapper {
    width: 160px;
  }

  .hero-title {
    font-size: 2.5rem;
  }

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

/* ─── Animations ────────────────────────────────── */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.65s ease-out, transform 0.65s ease-out;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}