/* Portfolio — Obaid Abdullah | Dark theme, cyan accent */

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

:root {
  --bg-primary: #0a192f;
  --bg-secondary: #112240;
  --bg-card: #172a45;
  --text-primary: #ccd6f6;
  --text-secondary: #8892b0;
  --accent: #64ffda;
  --accent-tint: rgba(100, 255, 218, 0.1);
  --white: #e6f1ff;
  --font-main: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "Fira Code", "Consolas", monospace;
  --nav-height: 70px;
  --transition: 0.25s ease;
}

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

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

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent); }
img { max-width: 100%; height: auto; display: block; }

/* --- Utility --- */
.container { max-width: 1000px; margin: 0 auto; padding: 0 25px; }
.section { padding: 100px 0; }
.highlight { color: var(--accent); }

.inline-link {
  color: var(--accent);
  position: relative;
}
.inline-link::after {
  content: "";
  position: absolute;
  width: 100%; height: 1px;
  bottom: 0; left: 0;
  background-color: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition);
}
.inline-link:hover::after { transform: scaleX(1); transform-origin: left; }

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}
.btn-primary {
  color: var(--accent);
  background-color: transparent;
  border: 1px solid var(--accent);
}
.btn-primary:hover { background-color: var(--accent-tint); }
.btn-outline {
  color: var(--text-primary);
  background-color: transparent;
  border: 1px solid var(--text-secondary);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

/* --- Section Title --- */
.section-title {
  display: flex;
  align-items: center;
  font-size: clamp(1.5rem, 3vw, 1.75rem);
  color: var(--white);
  margin-bottom: 40px;
  white-space: nowrap;
  font-weight: 600;
}
.section-number {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: clamp(0.875rem, 2vw, 1.125rem);
  margin-right: 10px;
  font-weight: 400;
}
.section-title::after {
  content: "";
  display: block;
  height: 1px; width: 200px;
  background-color: #233554;
  margin-left: 20px;
}

/* ===== NAVIGATION ===== */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background-color: rgba(10, 25, 47, 0.85);
  backdrop-filter: blur(10px);
  z-index: 1000;
  transition: all 0.3s ease;
}
#navbar.scrolled { box-shadow: 0 10px 30px -10px rgba(2, 12, 27, 0.7); }

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px;
}
.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: -0.5px;
}
.nav-logo:hover { color: var(--accent); }

.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
  align-items: center;
}
.nav-links a {
  color: var(--text-primary);
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  padding: 8px 12px;
  transition: color var(--transition);
}
.nav-links a:hover,
.nav-links a.active { color: var(--accent); }
.nav-number { color: var(--accent); margin-right: 4px; font-size: 0.75rem; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}
.hamburger span {
  display: block;
  width: 28px; height: 2px;
  background-color: var(--accent);
  transition: all 0.3s ease;
  transform-origin: center;
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ===== HERO ===== */
#hero {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 0 25px;
  position: relative;
}
.hero-content {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 25px;
}
.hero-greeting {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: clamp(0.875rem, 2vw, 1rem);
  margin-bottom: 20px;
}
.hero-name {
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  color: var(--white);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 10px;
}
.hero-tagline {
  font-size: clamp(2rem, 5vw, 3.5rem);
  color: var(--text-secondary);
  font-weight: 600;
  line-height: 1.1;
  margin-bottom: 25px;
}
.hero-description {
  max-width: 540px;
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 40px;
}
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }

/* Hero side social links */
.hero-socials {
  position: fixed;
  bottom: 0; left: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  z-index: 10;
}
.hero-socials a { color: var(--text-secondary); transition: all var(--transition); }
.hero-socials a:hover { color: var(--accent); transform: translateY(-3px); }
.social-line { width: 1px; height: 90px; background-color: var(--text-secondary); }

/* ===== ABOUT ===== */
.about-content {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 50px;
  align-items: start;
}
.about-text p { margin-bottom: 15px; font-size: 1rem; }

.image-wrapper {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
}
.image-wrapper::after {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background-color: rgba(100, 255, 218, 0.15);
  transition: background-color var(--transition);
}
.image-wrapper:hover::after { background-color: transparent; }
.image-wrapper img {
  border-radius: 8px;
  filter: grayscale(30%);
  transition: filter var(--transition);
}
.image-wrapper:hover img { filter: grayscale(0%); }

/* ===== SKILLS ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.skill-category {
  background-color: var(--bg-card);
  padding: 24px;
  border-radius: 8px;
  border: 1px solid #233554;
  transition: all var(--transition);
}
.skill-category:hover { border-color: var(--accent); transform: translateY(-4px); }
.skill-category-title {
  color: var(--white);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.skill-category-title svg { color: var(--accent); }
.skill-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.skill-tag {
  background-color: var(--accent-tint);
  color: var(--accent);
  padding: 4px 12px;
  border-radius: 20px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

/* ===== PROJECTS ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.project-card {
  background-color: var(--bg-card);
  border-radius: 8px;
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  border: 1px solid #233554;
  transition: all var(--transition);
  position: relative;
}
.project-card:hover {
  transform: translateY(-7px);
  border-color: var(--accent);
  box-shadow: 0 20px 30px -15px rgba(2, 12, 27, 0.7);
}
.project-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 24px;
}
.project-folder svg { color: var(--accent); }
.project-links { display: flex; gap: 12px; }
.project-links a { color: var(--text-secondary); transition: color var(--transition); }
.project-links a:hover { color: var(--accent); }
.project-title {
  color: var(--white);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 12px;
  line-height: 1.3;
}
.project-card:hover .project-title { color: var(--accent); }
.project-description {
  font-size: 0.925rem;
  line-height: 1.6;
  flex-grow: 1;
  margin-bottom: 20px;
}
.project-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: auto; }
.project-tags span { font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-secondary); }

/* ===== OPEN SOURCE ===== */
.opensource-intro { font-size: 1.05rem; margin-bottom: 32px; max-width: 700px; }
.contributions-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}
.contribution-card {
  background-color: var(--bg-card);
  padding: 28px;
  border-radius: 8px;
  border: 1px solid #233554;
  transition: all var(--transition);
}
.contribution-card:hover { border-color: var(--accent); transform: translateY(-4px); }
.contribution-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.contribution-header h3 { color: var(--white); font-size: 1.15rem; font-weight: 600; }
.contribution-badge {
  background-color: var(--accent-tint);
  color: var(--accent);
  padding: 2px 10px;
  border-radius: 20px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
}
.contribution-card p { font-size: 0.925rem; line-height: 1.6; }
.opensource-cta {
  background-color: var(--bg-secondary);
  padding: 32px;
  border-radius: 8px;
  border-left: 3px solid var(--accent);
  text-align: center;
}
.opensource-cta p { margin-bottom: 20px; font-size: 1rem; }

/* ===== EDUCATION ===== */
.education-content { display: flex; flex-direction: column; gap: 40px; }
.education-card {
  display: flex;
  align-items: center;
  gap: 24px;
  background-color: var(--bg-card);
  padding: 32px;
  border-radius: 8px;
  border: 1px solid #233554;
}
.education-icon svg { color: var(--accent); }
.education-details h3 { color: var(--white); font-size: 1.25rem; font-weight: 600; margin-bottom: 4px; }
.education-institution { font-size: 1rem; margin-bottom: 4px; }
.education-year { font-family: var(--font-mono); font-size: 0.875rem; color: var(--accent); }
.certifications-title { color: var(--white); font-size: 1.15rem; font-weight: 600; margin-bottom: 20px; }
.cert-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.cert-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.925rem;
  color: var(--text-primary);
}
.cert-item svg { color: var(--accent); flex-shrink: 0; }

/* ===== CONTACT ===== */
#contact { text-align: center; }
.contact-content { max-width: 600px; margin: 0 auto; }
.contact-text { font-size: 1.05rem; margin-bottom: 32px; line-height: 1.7; }
.contact-links { margin-bottom: 32px; }
.contact-socials { display: flex; justify-content: center; gap: 24px; }
.contact-socials a { color: var(--text-secondary); transition: all var(--transition); }
.contact-socials a:hover { color: var(--accent); transform: translateY(-3px); }

/* ===== FOOTER ===== */
#footer { padding: 24px; text-align: center; border-top: 1px solid #233554; }
.footer-content p { font-family: var(--font-mono); font-size: 0.8125rem; color: var(--text-secondary); margin-bottom: 4px; }
.footer-sub { font-size: 0.75rem; color: #4a5d7a; }

/* ===== CERTIFICATE IMAGES ===== */
.cert-images-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}
.cert-image-card {
  background-color: var(--bg-card);
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid #233554;
  transition: all var(--transition);
}
.cert-image-card:hover { border-color: var(--accent); transform: translateY(-4px); }
.cert-image-card img { width: 100%; height: auto; }
.cert-image-card p {
  padding: 12px 16px;
  font-size: 0.85rem;
  color: var(--text-primary);
  text-align: center;
  font-family: var(--font-mono);
}

/* ===== HOBBIES ===== */
.hobbies-content { display: flex; flex-direction: column; gap: 40px; }
.hobby-block { }
.hobby-title { color: var(--white); font-size: 1.2rem; font-weight: 600; margin-bottom: 12px; }
.hobby-desc { font-size: 1rem; margin-bottom: 20px; max-width: 700px; }
.hobby-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.hobby-card {
  background-color: var(--bg-card);
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid #233554;
  transition: all var(--transition);
  text-align: center;
}
.hobby-card:hover { border-color: var(--accent); transform: translateY(-4px); }
.hobby-card img { width: 100%; height: 200px; object-fit: cover; }
.hobby-card p { padding: 12px; color: var(--text-primary); font-weight: 500; font-size: 0.95rem; }
.hobby-card-single { max-width: 250px; }
.hobby-card-single img { height: 200px; object-fit: contain; background-color: var(--bg-secondary); padding: 16px; }

/* ===== CONTACT INFO ===== */
.contact-info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 32px;
  text-align: left;
}
.contact-info-card {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background-color: var(--bg-card);
  padding: 20px;
  border-radius: 8px;
  border: 1px solid #233554;
}
.contact-info-card svg { color: var(--accent); flex-shrink: 0; margin-top: 2px; }
.contact-info-card h4 { color: var(--white); font-size: 0.9rem; margin-bottom: 4px; }
.contact-info-card span, .contact-info-card a { font-size: 0.875rem; color: var(--text-secondary); }
.contact-links { display: flex; gap: 16px; justify-content: center; margin-bottom: 32px; }

/* ===== ANIMATIONS ===== */
.fade-in { opacity: 0; transform: translateY(25px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===== RESPONSIVE — TABLET ===== */
@media (max-width: 1024px) {
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .section { padding: 70px 0; }

  .hamburger { display: flex; }
  .nav-links {
    position: fixed;
    top: 0; right: -100%;
    width: min(75vw, 400px);
    height: 100vh;
    background-color: var(--bg-secondary);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 0;
    transition: right 0.3s ease;
    box-shadow: -10px 0 30px -15px rgba(2, 12, 27, 0.7);
  }
  .nav-links.open { right: 0; }
  .nav-links a { font-size: 1rem; padding: 16px 20px; display: block; width: 100%; text-align: center; }
  .nav-container { padding: 0 25px; }

  .about-content { grid-template-columns: 1fr; gap: 40px; }
  .about-image { max-width: 300px; margin: 0 auto; }
  .skills-grid { grid-template-columns: 1fr 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .contributions-grid { grid-template-columns: 1fr; }
  .cert-list { grid-template-columns: 1fr; }
  .cert-images-grid { grid-template-columns: 1fr; }
  .hobby-cards { grid-template-columns: 1fr; }
  .contact-info-grid { grid-template-columns: 1fr; }
  .hero-socials { display: none; }
  .section-title::after { width: 100px; }
  .hero-name { font-size: clamp(2rem, 8vw, 3rem); }
  .hero-tagline { font-size: clamp(1.5rem, 5vw, 2.2rem); }
}

@media (max-width: 480px) {
  .section { padding: 50px 0; }
  .container { padding: 0 20px; }
  .nav-links { width: 100vw; }
  .skills-grid { grid-template-columns: 1fr; }
  .hero-cta { flex-direction: column; align-items: flex-start; }
  .hero-cta .btn { width: 100%; text-align: center; }
  .education-card { flex-direction: column; text-align: center; }
  .section-title::after { width: 60px; }
  .contact-socials { gap: 16px; }
  .opensource-cta { padding: 24px 16px; }
}

/* Mobile overlay */
.nav-overlay { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(10, 25, 47, 0.7); z-index: 999; }
.nav-overlay.active { display: block; }