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

:root {
  --color-bg: #0f0f0f;
  --color-bg-alt: #161616;
  --color-surface: #1e1e1e;
  --color-border: #2a2a2a;
  --color-text: #e8e8e8;
  --color-muted: #888;
  --color-accent: #6c63ff;
  --color-accent-hover: #574fd6;
  --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --radius: 8px;
  --transition: 0.2s ease;
}

html {
  scroll-behavior: smooth;
}

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

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

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

.section {
  padding: 80px 0;
}

.section-alt {
  background-color: var(--color-bg-alt);
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 2.5rem;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  display: block;
  height: 3px;
  width: 50px;
  background: var(--color-accent);
  margin-top: 8px;
  border-radius: 2px;
}

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: rgba(15, 15, 15, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.nav-logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-accent);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.95rem;
  color: var(--color-muted);
  transition: color var(--transition);
}

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

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
  background: radial-gradient(ellipse at top, #1a1040 0%, var(--color-bg) 65%);
}

.hero-content {
  max-width: 600px;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1rem;
}

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

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-muted);
  margin-bottom: 2rem;
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 0.7rem 1.6rem;
  background: var(--color-accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}

.btn:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 0.45rem 1rem;
  font-size: 0.85rem;
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
}

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

.btn-disabled {
  opacity: 0.6;
  cursor: default;
  pointer-events: none;
}

/* ===== About ===== */
.about-content {
  display: flex;
  align-items: flex-start;
  gap: 2.5rem;
  max-width: 820px;
}

.about-photo {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  border: 3px solid var(--color-accent);
  flex-shrink: 0;
}

.about-text p {
  color: var(--color-muted);
  margin-bottom: 1rem;
  font-size: 1.05rem;
}

.about-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.about-links-label {
  color: var(--color-muted);
  font-size: 0.95rem;
}

@media (max-width: 640px) {
  .about-content {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}

/* ===== Projects ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

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

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
}

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

.placeholder-img {
  background: linear-gradient(135deg, #1e1640 0%, #2a1f5e 100%);
}

.project-img-swap {
  position: relative;
  width: 100%;
  height: 180px;
  overflow: hidden;
}

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

.project-img-swap .img-hover {
  opacity: 0;
}

.project-card:hover .project-img-swap .img-default {
  opacity: 0;
}

.project-card:hover .project-img-swap .img-hover {
  opacity: 1;
}

.project-info {
  padding: 1.25rem;
}

.project-info h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.project-info p {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.tag {
  background: rgba(108, 99, 255, 0.15);
  color: var(--color-accent);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.78rem;
  font-weight: 500;
}

.project-links {
  display: flex;
  gap: 0.75rem;
}

/* ===== Skills ===== */
.skills-categories {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.skill-group-title {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
}

.skills-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.skill-item {
  background: var(--color-surface);
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: opacity var(--transition);
}

.skill-item:hover {
  opacity: 0.85;
}

/* Languages — purple */
.skill-lang-title { color: #6c63ff; }
.skill-lang {
  border-color: #6c63ff;
  color: #a89fff;
  background: rgba(108, 99, 255, 0.1);
}

/* Frameworks & Libraries — teal */
.skill-framework-title { color: #2dd4bf; }
.skill-framework {
  border-color: #2dd4bf;
  color: #7ee8df;
  background: rgba(45, 212, 191, 0.1);
}

/* Tools — amber */
.skill-tool-title { color: #f59e0b; }
.skill-tool {
  border-color: #f59e0b;
  color: #fbbf24;
  background: rgba(245, 158, 11, 0.1);
}

/* Operating Systems — rose */
.skill-os-title { color: #f43f5e; }
.skill-os {
  border-color: #f43f5e;
  color: #fb7185;
  background: rgba(244, 63, 94, 0.1);
}

/* Data & AI — sky blue */
.skill-ai-title { color: #38bdf8; }
.skill-ai {
  border-color: #38bdf8;
  color: #7dd3fc;
  background: rgba(56, 189, 248, 0.1);
}

/* ===== Contact ===== */
.contact-intro {
  color: var(--color-muted);
  margin-bottom: 2rem;
  font-size: 1.05rem;
}

.contact-form {
  max-width: 560px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: border-color var(--transition);
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

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

/* ===== Footer ===== */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 1.5rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.9rem;
  color: var(--color-muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

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

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .navbar {
    padding: 0.9rem 1.25rem;
  }

  .nav-links {
    gap: 1.25rem;
  }

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