/* ============================================================
   CSS Custom Properties
   ============================================================ */
:root {
  --bg:          #0d1117;
  --surface:     #161b22;
  --surface-2:   #21262d;
  --border:      #30363d;
  --accent:      #58a6ff;
  --accent-alt:  #f78166;
  --text:        #e6edf3;
  --text-muted:  #8b949e;
  --radius:      8px;
  --transition:  0.25s ease;
  --max-width:   1100px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

h1, h2, h3 {
  font-family: 'Space Grotesk', sans-serif;
  line-height: 1.2;
}

a {
  color: var(--accent);
  text-decoration: none;
}

ul {
  list-style: none;
}

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

/* ============================================================
   Utility
   ============================================================ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 5rem 1.5rem;
}

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

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  margin-bottom: 0.5rem;
}

.section-title::after {
  content: '';
  display: block;
  width: 3rem;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
  margin-top: 0.5rem;
  margin-bottom: 2.5rem;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 1.5rem;
  border-radius: var(--radius);
  font-family: 'Inter', system-ui, sans-serif;
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
}

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

.btn-primary:hover {
  background: transparent;
  border-color: var(--accent);
  color: var(--accent);
}

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

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-sm {
  padding: 0.4rem 1rem;
  font-size: 0.85rem;
}

/* ============================================================
   Navbar
   ============================================================ */
#navbar {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 2rem;
  transition: background var(--transition), box-shadow var(--transition);
}

#navbar.scrolled {
  background: var(--surface);
  box-shadow: 0 1px 0 var(--border);
}

.nav-brand {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.5px;
}

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

.nav-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
  text-decoration: none;
}

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.25rem;
}

/* ============================================================
   Hero
   ============================================================ */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background-image: radial-gradient(var(--border) 1px, transparent 1px);
  background-size: 28px 28px;
  position: relative;
}

#hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 40%, var(--bg) 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 700px;
  padding: 0 1.5rem;
}

.hero-tagline {
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
}

.hero-name {
  font-size: clamp(3rem, 10vw, 5.5rem);
  background: linear-gradient(135deg, var(--text) 30%, var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.25rem;
}

.hero-role {
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.hero-sub {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 520px;
  margin: 0 auto 2rem;
  line-height: 1.7;
}

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

/* ============================================================
   About
   ============================================================ */
#about {
  background: var(--surface);
}

.about-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 3rem;
  align-items: start;
}

.photo-placeholder {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: var(--surface-2);
  border: 2px dashed var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: var(--text-muted);
}

.about-photo img {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border);
}

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

.about-text p:last-of-type {
  margin-bottom: 1.5rem;
}

/* ============================================================
   Skills
   ============================================================ */
.skill-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.skill-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.25rem;
  text-align: center;
  transition: transform var(--transition), border-color var(--transition);
}

.skill-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}

.skill-icon {
  font-size: 2.5rem;
  color: var(--accent);
  margin-bottom: 0.75rem;
  display: block;
}

.skill-card span {
  display: block;
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.skill-card small {
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* Skill bars */
.skill-bars {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  max-width: 700px;
}

.skill-bar-item {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.skill-bar-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  font-weight: 500;
}

.skill-bar-label span:last-child {
  color: var(--text-muted);
}

.skill-bar-track {
  background: var(--surface-2);
  border-radius: 999px;
  height: 8px;
  overflow: hidden;
}

.skill-bar-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-alt));
  border-radius: 999px;
  transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   Projects
   ============================================================ */
#projects {
  background: var(--surface);
}

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

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

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}

.project-card-header {
  padding: 2rem;
  font-size: 2.5rem;
  text-align: center;
}

.project-card-header.python {
  background: linear-gradient(135deg, #30699830, #ffd43b15);
  color: #ffd43b;
}

.project-card-header.sql {
  background: linear-gradient(135deg, #33679130, #61b3de15);
  color: #61b3de;
}

.project-card-header.powerbi {
  background: linear-gradient(135deg, #f2c81130, #f2c81115);
  color: #f2c811;
}

.project-card-body {
  padding: 1.5rem;
}

.project-tag {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.2rem 0.75rem;
  margin-bottom: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.project-card-body h3 {
  font-size: 1.15rem;
  margin-bottom: 0.6rem;
}

.project-card-body p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.25rem;
  line-height: 1.6;
}

/* ============================================================
   Contact
   ============================================================ */
.contact-sub {
  color: var(--text-muted);
  margin-bottom: 2rem;
  font-size: 1rem;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 380px;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  text-decoration: none;
  padding: 0.9rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: color var(--transition), border-color var(--transition);
}

.contact-link:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.contact-link i {
  width: 1.25rem;
  text-align: center;
  color: var(--accent);
}

/* ============================================================
   Footer
   ============================================================ */
footer {
  text-align: center;
  padding: 2rem 1.5rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}

/* ============================================================
   Project Detail Pages
   ============================================================ */
.project-page {
  padding-top: 6rem;
  min-height: 100vh;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  text-decoration: none;
  margin-bottom: 2rem;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}

.back-link:hover {
  color: var(--accent);
}

.project-hero {
  padding: 3rem 2rem;
  border-radius: var(--radius);
  text-align: center;
  margin-bottom: 3rem;
}

.project-hero i {
  font-size: 3rem;
  margin-bottom: 0.75rem;
  display: block;
}

.project-hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
}

.project-hero.python {
  background: linear-gradient(135deg, #30699820, #ffd43b10);
  border: 1px solid #ffd43b40;
  color: var(--text);
}
.project-hero.python i { color: #ffd43b; }

.project-hero.sql {
  background: linear-gradient(135deg, #33679120, #61b3de10);
  border: 1px solid #61b3de40;
  color: var(--text);
}
.project-hero.sql i { color: #61b3de; }

.project-hero.powerbi {
  background: linear-gradient(135deg, #f2c81120, #f2c81110);
  border: 1px solid #f2c81140;
  color: var(--text);
}
.project-hero.powerbi i { color: #f2c811; }

.project-meta {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  margin-top: 1rem;
  flex-wrap: wrap;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.project-meta span {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.project-section {
  margin-bottom: 3rem;
}

.project-section h2 {
  font-size: 1.3rem;
  color: var(--accent);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.project-section p {
  color: var(--text-muted);
  line-height: 1.8;
}

.project-section ul {
  list-style: disc;
  padding-left: 1.5rem;
  color: var(--text-muted);
}

.project-section li {
  margin-bottom: 0.5rem;
  line-height: 1.7;
}

.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.screenshot-placeholder {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 4rem 2rem;
  text-align: center;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
}

.screenshot-placeholder i {
  font-size: 2.5rem;
  color: var(--border);
}

.screenshot-item {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--surface);
}

.screenshot-img {
  width: 100%;
  display: block;
  transition: transform 0.3s ease;
}

.screenshot-item:hover .screenshot-img {
  transform: scale(1.02);
}

.screenshot-item figcaption {
  padding: 0.6rem 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

/* Tech stack icons */
.tech-stack {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.5rem;
}

.tech-item {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.65rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: border-color var(--transition);
}

.tech-item:hover {
  border-color: var(--accent);
}

.tech-item img {
  width: 1rem;
  height: 1rem;
}

.tech-item span {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
  white-space: nowrap;
}

/* Project card with screenshot preview header */
.project-card-header.preview-img {
  padding: 0;
  height: 180px;
  overflow: hidden;
}

.project-card-header.preview-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
  display: block;
  transition: transform 0.4s ease;
}

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

.project-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 768px) {
  #navbar {
    padding: 1rem 1.25rem;
  }

  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    gap: 0;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem 0;
  }

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

  .nav-links li {
    width: 100%;
  }

  .nav-links a {
    display: block;
    padding: 0.75rem 1.5rem;
    width: 100%;
  }

  .about-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .about-grid .photo-placeholder {
    margin: 0 auto;
  }

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

  .skill-cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .contact-links {
    max-width: 100%;
  }
}

@media (min-width: 769px) {
  .nav-toggle {
    display: none;
  }
}