/* ===================== Theme Variables ===================== */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f7f8fb;
  --bg-card: #ffffff;
  --text-primary: #14161a;
  --text-secondary: #565b66;
  --border-color: #e5e7eb;
  --accent: #5b5bf5;
  --accent-hover: #4747d8;
  --accent-soft: rgba(91, 91, 245, 0.1);
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 10px 30px rgba(0, 0, 0, 0.1);
  --success-bg: #e6f7ed;
  --success-text: #1b7a43;
  --error-bg: #fdecec;
  --error-text: #c0392b;
  --radius: 12px;
  --transition: 0.25s ease;
}

[data-theme="dark"] {
  --bg-primary: #0f1115;
  --bg-secondary: #15171d;
  --bg-card: #1a1d24;
  --text-primary: #f1f2f4;
  --text-secondary: #9aa0ac;
  --border-color: #2a2d35;
  --accent: #7b7bff;
  --accent-hover: #9292ff;
  --accent-soft: rgba(123, 123, 255, 0.15);
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 10px 30px rgba(0, 0, 0, 0.4);
  --success-bg: #11301f;
  --success-text: #4fd58c;
  --error-bg: #341417;
  --error-text: #f06868;
}

/* ===================== Reset ===================== */
* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

section[id] {
  scroll-margin-top: 80px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

h1, h2, h3, h4, h5 {
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  line-height: 1.2;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ===================== Buttons ===================== */
.btn {
  display: inline-block;
  padding: 0.8rem 1.8rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

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

.btn-sm { padding: 0.5rem 1.1rem; font-size: 0.85rem; }
.btn-block { width: 100%; text-align: center; }

/* ===================== Header / Navbar ===================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition);
}

.navbar {
  max-width: 1140px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
}

.logo {
  font-family: 'Poppins', sans-serif;
  font-size: 1.4rem;
  font-weight: 800;
}
.logo .accent { color: var(--accent); }

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

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

.nav-links a {
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 0.4rem 0;
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--text-primary); }
.nav-links a.active { color: var(--accent); }
.nav-links a.active::after {
  content: '';
  position: absolute;
  left: 0; bottom: -4px;
  width: 100%;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

.nav-links a.nav-resume {
  background: var(--accent);
  color: #fff;
  padding: 0.5rem 1.2rem;
  border-radius: 999px;
  font-weight: 600;
}
.nav-links a.nav-resume:hover {
  background: var(--accent-hover);
  color: #fff;
}
.nav-links a.nav-resume.active::after { display: none; }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-toggle {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-primary);
  transition: all var(--transition);
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.4rem;
}
.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===================== Hero ===================== */
.hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  padding: 3rem 1.5rem;
  max-width: 1140px;
  margin: 0 auto;
}

.hero-content { max-width: 700px; }
.hero-greeting { color: var(--accent); font-weight: 600; margin-bottom: 0.5rem; }
.hero-name {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  margin-bottom: 0.5rem;
}
.hero-title {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  color: var(--text-secondary);
  margin-bottom: 1.2rem;
}
.hero-desc {
  color: var(--text-secondary);
  max-width: 540px;
  margin-bottom: 2rem;
  font-size: 1.05rem;
}
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

/* ===================== Generic Sections ===================== */
.home-section { padding: 4rem 0; }
.section-label {
  text-align: center;
  font-size: 1.8rem;
  margin-bottom: 2.5rem;
}

.page-header {
  padding: 4rem 1.5rem 2rem;
  text-align: center;
  background: var(--bg-secondary);
}
.page-header h1 { font-size: clamp(2rem, 5vw, 3rem); margin-bottom: 0.5rem; }
.page-header p { color: var(--text-secondary); font-size: 1.1rem; }

/* ===================== Cards (Home info cards) ===================== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
}
.info-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.info-icon {
  font-size: 1.8rem;
  width: 60px; height: 60px;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 1rem;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 50%;
}
.info-card h4 { margin-bottom: 0.6rem; }
.info-card p { color: var(--text-secondary); font-size: 0.95rem; }

.cta-section { padding: 2rem 0 5rem; }
.cta-box {
  background: var(--bg-secondary);
  border-radius: var(--radius);
  padding: 3rem 2rem;
  text-align: center;
}
.cta-box h3 { font-size: 1.8rem; margin-bottom: 0.6rem; }
.cta-box p { color: var(--text-secondary); margin-bottom: 1.5rem; }

/* ===================== Page Sections (single-page layout) ===================== */
.page-section { padding: 5rem 0;}
.page-section.alt-bg { background: var(--bg-secondary); }
.section-title {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  margin-bottom: 0.6rem;
}
.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 3rem;
}

/* ===================== About ===================== */
.about-grid {
  margin-bottom: 4rem;
}
.about-grid:has(.about-image) {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 3rem;
  align-items: center;
}
.about-image img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  aspect-ratio: 1/1;
  object-fit: cover;
}
.about-bio h3 { font-size: 1.8rem; margin-bottom: 1rem; }
.about-bio p { color: var(--text-secondary); margin-bottom: 1rem; }
.about-bio .btn { margin-top: 0.5rem; }

.about-subsection { margin-top: 3.5rem; }
.subsection-label {
  text-align: center;
  font-size: 1.4rem;
  margin-bottom: 2rem;
}

/* ===================== Certificates Marquee ===================== */
.cert-marquee {
  overflow: hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
}
.cert-track {
  display: flex;
  gap: 1.5rem;
  width: max-content;
  animation: cert-scroll 32s linear infinite;
}
.cert-marquee:hover .cert-track { animation-play-state: paused; }
.cert-card {
  flex: 0 0 380px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.cert-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.cert-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
}

@keyframes cert-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

@media (prefers-reduced-motion: reduce) {
  .cert-track { animation: none; }
}

.skills-categories {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}
.skill-category-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.6rem;
}
.skill-category-card h5 { font-size: 1.05rem; margin-bottom: 1.1rem; }
.skill-tags { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.skill-tag {
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid transparent;
}
.skill-tag.c-blue   { color: #2f6fed; border-color: rgba(47, 111, 237, 0.35); background: rgba(47, 111, 237, 0.1); }
.skill-tag.c-green  { color: #1fa971; border-color: rgba(31, 169, 113, 0.35); background: rgba(31, 169, 113, 0.1); }
.skill-tag.c-orange { color: #e8722a; border-color: rgba(232, 114, 42, 0.35); background: rgba(232, 114, 42, 0.1); }
.skill-tag.c-purple { color: #9854e0; border-color: rgba(152, 84, 224, 0.35); background: rgba(152, 84, 224, 0.1); }
.skill-tag.c-pink   { color: #e0509a; border-color: rgba(224, 80, 154, 0.35); background: rgba(224, 80, 154, 0.1); }

/* ===================== Volunteer ===================== */
.volunteer-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem;
}
.volunteer-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.4rem 1.6rem;
}
.volunteer-card h5 { font-size: 1rem; margin-bottom: 0.5rem; }
.volunteer-card p { color: var(--text-secondary); font-size: 0.9rem; }

.timeline {
  border-left: 2px solid var(--border-color);
  padding-left: 2rem;
}
.timeline-item { position: relative; margin-bottom: 2.5rem; }
.timeline-item::before {
  content: '';
  position: absolute;
  left: -2.45rem;
  top: 0.3rem;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--accent);
}
.timeline-date { color: var(--accent); font-weight: 600; font-size: 0.9rem; margin-bottom: 0.3rem; }
.timeline-content h4 { margin-bottom: 0.2rem; }
.timeline-company { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 0.4rem; font-style: italic; }
.timeline-content p:last-child { color: var(--text-secondary); }

/* ===================== Projects ===================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.8rem;
}
.project-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition);
}
.project-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.featured-badge {
  position: absolute;
  top: 1.2rem; right: 1.2rem;
  background: var(--accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
}
.project-card h3 { margin-bottom: 0.6rem; padding-right: 5rem; }
.project-desc { color: var(--text-secondary); font-size: 0.92rem; margin-bottom: 1.4rem; }

.project-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.4rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1rem 0.4rem;
  margin-bottom: 1.4rem;
}
.project-stat { text-align: center; }
.project-stat .stat-value {
  display: block;
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  color: var(--accent);
  margin-bottom: 0.2rem;
  word-break: break-word;
}
.project-stat .stat-label {
  font-size: 0.7rem;
  color: var(--text-secondary);
}

.project-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: auto; }
.tag {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-family: 'Courier New', monospace;
  font-size: 0.76rem;
  font-weight: 600;
  padding: 0.3rem 0.7rem;
  border-radius: 6px;
}

.github-cta { text-align: center; margin-top: 3rem; }
.github-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.9rem 2rem;
  border: 2px solid var(--accent);
  border-radius: 999px;
  color: var(--accent);
  font-weight: 600;
  transition: all var(--transition);
}
.github-cta-btn svg { width: 20px; height: 20px; }
.github-cta-btn:hover {
  background: var(--accent-soft);
  transform: translateY(-2px);
}

/* ===================== Contact ===================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 3rem;
}
.contact-info h3 { margin-bottom: 0.8rem; }
.contact-info p { color: var(--text-secondary); margin-bottom: 1.5rem; }
.contact-details li { margin-bottom: 0.6rem; color: var(--text-secondary); }

.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 2rem;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-group { margin-bottom: 1.2rem; }
.form-group label { display: block; margin-bottom: 0.4rem; font-weight: 600; font-size: 0.9rem; }
.form-group input, .form-group textarea {
  width: 100%;
  padding: 0.7rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color var(--transition);
}
.form-group input:focus, .form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
}
.form-alert {
  padding: 0.8rem 1rem;
  border-radius: 8px;
  margin-bottom: 1.2rem;
  font-size: 0.9rem;
  font-weight: 500;
}
.form-alert-success { background: var(--success-bg); color: var(--success-text); }
.form-alert-error { background: var(--error-bg); color: var(--error-text); }

/* ===================== Footer ===================== */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding-top: 3rem;
}
.footer-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 1.5rem 2rem;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
}
.footer-brand p { color: var(--text-secondary); margin-top: 0.8rem; max-width: 320px; }
.footer-links h4, .footer-social h4 { margin-bottom: 1rem; font-size: 1rem; }
.footer-links ul li { margin-bottom: 0.6rem; }
.footer-links a { color: var(--text-secondary); transition: color var(--transition); }
.footer-links a:hover { color: var(--accent); }
.social-icons { display: flex; gap: 0.8rem; }
.social-icons a {
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  color: var(--text-primary);
  transition: all var(--transition);
}
.social-icons a:hover { background: var(--accent); color: #fff; border-color: var(--accent); transform: translateY(-3px); }
.social-icons svg { width: 18px; height: 18px; }
.footer-bottom {
  text-align: center;
  padding: 1.2rem 0;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* ===================== Scroll Animations ===================== */
.fade-in, .fade-in-up {
  opacity: 0;
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-in { }
.fade-in-up { transform: translateY(24px); }
.fade-in.in-view, .fade-in-up.in-view {
  opacity: 1;
  transform: none;
}

/* ===================== Responsive ===================== */
@media (max-width: 1100px) {
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  .about-grid:has(.about-image) { grid-template-columns: 1fr; text-align: center; }
  .about-image { max-width: 280px; margin: 0 auto; }
  .contact-grid { grid-template-columns: 1fr; }
  .cards-grid { grid-template-columns: 1fr 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .skills-categories { grid-template-columns: 1fr; }
  .volunteer-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; text-align: center; }
  .social-icons { justify-content: center; }
}

@media (max-width: 720px) {
  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    padding: 2rem 0;
    transform: translateY(-110%);
    transition: transform var(--transition);
    z-index: 99;
  }
  .nav-links.open { transform: translateY(0); }
  .hamburger { display: flex; }
  .cards-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .hero { min-height: 70vh; text-align: center; align-items: flex-start; padding-top: 4rem; }
  .hero-actions { justify-content: center; width: 100%; }
}