/* --- Reset and Base Styles --- */
:root {
  --color-bg: #f6faff;
  --color-bg-card: #fff;
  --color-primary: #1565c0;
  --color-primary-dark: #1a237e;
  --color-accent: #64b5f6;
  --color-text: #1a237e;
  --color-text-light: #e3eaf3;
  --color-border: #e3eaf3;
  --color-shadow: rgba(21,101,192,0.10);
}
body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: 'Poppins', 'Lato', Arial, sans-serif;
  margin: 0;
  padding: 0;
  min-height: 100vh;
  overflow-x: hidden;
}
.dark-mode {
  --color-bg: #181f2c;
  --color-bg-card: #232b3a;
  --color-primary: #64b5f6;
  --color-primary-dark: #90caf9;
  --color-accent: #1976d2;
  --color-text: #f6faff;
  --color-text-light: #b0bed9;
  --color-border: #26304a;
  --color-shadow: rgba(100,181,246,0.10);
}
* {
  box-sizing: border-box;
}
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* --- Navbar --- */
.navbar {
  position: sticky;
  top: 0;
  width: 100%;
  background: var(--color-bg-card);
  box-shadow: 0 2px 12px var(--color-shadow);
  z-index: 100;
  padding: 1.2rem 0;
}
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 1px;
}
.nav-links {
  display: flex;
  gap: 2rem;
}
.nav-link {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.08rem;
  padding: 0.5rem 1.2rem;
  border-radius: 1.2rem;
  transition: background 0.2s, color 0.2s;
}
.nav-link.active,
.nav-link:hover {
  background: var(--color-primary);
  color: #fff;
}
.dark-mode .nav-link.active,
.dark-mode .nav-link:hover {
  background: var(--color-accent);
  color: #181f2c;
}

/* --- Hero Section --- */
.hero-section {
  background: linear-gradient(120deg, var(--color-primary) 60%, var(--color-accent) 100%);
  color: #fff;
  border-radius: 2.5rem;
  margin: 2.5rem 0 2rem 0;
  box-shadow: 0 8px 32px rgba(26,35,126,0.10);
  padding: 4.5rem 0;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 70vh;
}
@media (max-width: 900px) {
  .hero-section {
    padding: 2.5rem 0;
    min-height: 50vh;
  }
}
@media (max-width: 600px) {
  .hero-section {
    padding: 1.5rem 0;
    min-height: 30vh;
  }
}
.hero-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 3rem;
}
.hero-left {
  flex: 1.2;
}
.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  margin-bottom: 0.7rem;
  letter-spacing: 1px;
}
.hero-subtitle {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1.2rem;
  color: #e3eaf3;
}
.hero-desc {
  font-size: 1.15rem;
  margin-bottom: 2rem;
  color: #e3eaf3;
  max-width: 500px;
}
.hero-btn {
  background: #fff;
  color: #1565c0;
  font-size: 1.1rem;
  font-weight: 700;
  border: none;
  border-radius: 2rem;
  padding: 1rem 2.5rem;
  box-shadow: 0 4px 16px rgba(21,101,192,0.10);
  cursor: pointer;
  transition: background 0.2s, color 0.2s, transform 0.2s;
  margin-top: 1.2rem;
}
.hero-btn:hover {
  background: #1565c0;
  color: #fff;
  transform: scale(1.07);
}
.hero-right {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-photo {
  width: 260px;
  height: 260px;
  border-radius: 50%;
  object-fit: cover;
  border: 7px solid #fff;
  box-shadow: 0 0 32px 8px #90caf9, 0 2px 18px rgba(21,101,192,0.18);
  background: #fff;
  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  transform: scale(1) rotate(0deg);
}
.hero-photo:hover {
  box-shadow: 0 0 48px 12px #64b5f6, 0 2px 24px rgba(21,101,192,0.22);
  border: 7px solid #1565c0;
  transform: scale(1.05) rotate(-1deg);
}
.dark-mode .hero-photo {
  border: 7px solid var(--color-bg-card);
  box-shadow: 0 0 32px 8px var(--color-accent), 0 2px 18px rgba(100,181,246,0.18);
}
.dark-mode .hero-photo:hover {
  box-shadow: 0 0 48px 12px var(--color-primary), 0 2px 24px rgba(100,181,246,0.22);
  border: 7px solid var(--color-accent);
  transform: scale(1.05) rotate(-1deg);
}
.hero-btn-secondary {
  background: #fff;
  color: #1565c0;
  border: 2px solid #1565c0;
  font-weight: 700;
  margin-left: 1rem;
  box-shadow: 0 2px 8px rgba(21,101,192,0.08);
  transition: background 0.2s, color 0.2s, border 0.2s, transform 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
}
.hero-btn-secondary:hover {
  background: #1565c0;
  color: #fff;
  border-color: #1565c0;
  transform: scale(1.07);
}
@media (max-width: 700px) {
  .hero-btn-secondary {
    margin-left: 0.5rem;
    font-size: 0.98rem;
    padding: 0.7rem 1.5rem;
  }
}

/* --- Card Sections --- */
.card-section {
  background: var(--color-bg-card);
  border-radius: 2rem;
  box-shadow: 0 8px 32px var(--color-shadow);
  margin: 2.5rem 0;
  padding: 3rem 2.5rem;
  position: relative;
  transition: background 0.3s, color 0.3s, box-shadow 0.3s;
}
.card-section:hover {
  box-shadow: 0 16px 48px rgba(21,101,192,0.18);
  transform: translateY(-6px) scale(1.02);
}
.card-section h2 {
  color: #1565c0;
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
}

/* --- Project Cards --- */
.project-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
}
@media (max-width: 900px) {
  .project-list {
    grid-template-columns: 1fr;
  }
}
.project-card {
  background: #f6faff;
  border-radius: 1.3rem;
  box-shadow: 0 2px 12px rgba(21,101,192,0.07);
  padding: 2rem 1.5rem 2.2rem 1.5rem;
  transition: box-shadow 0.7s cubic-bezier(0.22, 0.61, 0.36, 1), transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1), border 0.7s cubic-bezier(0.22, 0.61, 0.36, 1), background 0.7s cubic-bezier(0.22, 0.61, 0.36, 1);
  min-height: 200px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border: 1px solid #e3eaf3;
}
.project-card:hover {
  box-shadow: 0 8px 32px rgba(21,101,192,0.13);
  transform: translateY(-6px) scale(1.03);
  border: 1.5px solid #1565c0;
  background: #fff;
}
.project-card:active {
  transform: translateY(-2px) scale(0.99);
  box-shadow: 0 2px 8px rgba(21,101,192,0.10);
}
.project-card h3 {
  color: #1565c0;
  font-size: 1.25rem;
  margin-bottom: 0.7em;
}
.project-card p {
  color: #444;
  font-size: 1.08rem;
  margin-bottom: 1em;
}
.project-github {
  display: inline-flex;
  align-items: center;
  gap: 0.2em;
  background: #fff;
  color: #1565c0;
  border: 1.5px solid #1565c0;
  border-radius: 50%;
  padding: 0.3em 0.5em;
  font-size: 1.1rem;
  font-weight: 600;
  text-decoration: none;
  margin-top: auto;
  margin-bottom: 0.2em;
  box-shadow: 0 2px 8px rgba(21,101,192,0.06);
  transition: background 0.2s, color 0.2s, border 0.2s, transform 0.2s;
  width: 2.1em;
  height: 2.1em;
  justify-content: center;
}
.project-github i {
  font-size: 1.2em;
}
.project-github:hover {
  background: #1565c0;
  color: #fff;
  border-color: #1565c0;
  transform: scale(1.08);
}
@media (max-width: 700px) {
  .project-github {
    font-size: 1rem;
    padding: 0.2em 0.4em;
    width: 1.7em;
    height: 1.7em;
  }
}

/* --- Education Section --- */
.education-list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-top: 2rem;
}
.education-item {
  display: flex;
  gap: 2rem;
  background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-card) 100%);
  padding: 2rem;
  border-radius: 1.5rem;
  border: 2px solid #e3eaf3;
  box-shadow: 0 4px 16px rgba(21,101,192,0.08);
  transition: all 0.4s cubic-bezier(0.4,0,0.2,1);
  position: relative;
  overflow: hidden;
}
.education-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, #1565c0 0%, #64b5f6 100%);
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 4px 16px rgba(21,101,192,0.2);
}
.education-icon i {
  font-size: 2rem;
  color: #fff;
}
.education-content h3 {
  color: #1565c0;
  font-size: 1.4rem;
  font-weight: 700;
  margin: 0 0 0.5rem 0;
  letter-spacing: 0.5px;
}
.education-school {
  color: #1976d2;
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 0.3rem 0;
}
.education-year {
  color: #64b5f6;
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 1rem 0;
  background: rgba(100, 181, 246, 0.1);
  padding: 0.3rem 0.8rem;
  border-radius: 0.8rem;
  display: inline-block;
}
.education-description {
  color: #555;
  font-size: 1rem;
  line-height: 1.6;
  margin: 0;
}

/* --- Skills List --- */
.skills-list {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}
.skills-list li {
  background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-card) 100%);
  padding: 1.5rem 2rem;
  border-radius: 1.2rem;
  border: 2px solid #e3eaf3;
  font-weight: 600;
  font-size: 1.1rem;
  color: #1565c0;
  text-align: center;
  box-shadow: 0 4px 16px rgba(21,101,192,0.08);
  transition: all 0.4s cubic-bezier(0.4,0,0.2,1);
  position: relative;
  overflow: hidden;
}
.skills-list li:hover {
  transform: translateY(-8px) scale(1.04);
  box-shadow: 0 12px 32px rgba(21,101,192,0.18);
  background: linear-gradient(135deg, var(--color-bg-card) 0%, var(--color-accent) 100%);
  border-color: #1565c0;
}

/* --- Contact Form --- */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.3rem;
  max-width: 500px;
  margin: 0 auto;
}
.contact-form input,
.contact-form textarea {
  border: 1.5px solid #e3eaf3;
  border-radius: 1rem;
  padding: 1rem 1.2rem;
  font-size: 1.08rem;
  font-family: inherit;
  background: var(--color-bg);
  color: var(--color-text);
  outline: none;
  transition: background 0.2s, color 0.2s, border 0.2s;
}
.contact-form input:focus,
.contact-form textarea:focus {
  border: 1.5px solid #1565c0;
}
.dark-mode .contact-form input, .dark-mode .contact-form textarea {
  background: #232b3a;
  color: var(--color-text);
  border: 1.5px solid #26304a;
}
.contact-form button {
  background: #1565c0;
  color: #fff;
  border: none;
  border-radius: 1.2rem;
  padding: 0.8rem 1.7rem;
  font-weight: 700;
  font-size: 1.08rem;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
  box-shadow: 0 2px 8px rgba(21,101,192,0.08);
}
.contact-form button:hover {
  background: #64b5f6;
  transform: scale(1.04);
}
.contact-links {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: flex-start;
}
.contact-links a {
  color: #1565c0;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.08rem;
  transition: color 0.2s;
}
.contact-links a:hover {
  color: #1976d2;
}

/* --- CV Button --- */
.cv-btn {
  background: #1565c0;
  color: #fff;
  border: none;
  border-radius: 1.2rem;
  padding: 0.8rem 1.7rem;
  font-weight: 700;
  font-size: 1.08rem;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 2px 8px rgba(21,101,192,0.08);
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
}
.cv-btn:hover {
  background: #64b5f6;
  color: #fff;
  transform: scale(1.04);
  box-shadow: 0 4px 16px rgba(21,101,192,0.12);
}

/* --- Footer --- */
footer {
  width: 100vw;
  background: var(--color-bg-card);
  border-top: 1px solid var(--color-border);
  box-shadow: 0 -2px 12px rgba(21,101,192,0.04);
  padding: 2rem 0 1.2rem 0;
  text-align: center;
  color: var(--color-text-light);
  font-size: 1.08rem;
  margin-top: 3rem;
}
.heart {
  color: var(--color-primary);
}
.dark-mode .heart {
  color: var(--color-accent);
}

/* --- Responsive Design --- */
@media (max-width: 1100px) {
  .container { max-width: 98vw; }
  .hero-container { flex-direction: column; gap: 2rem; }
  .hero-right { justify-content: flex-start; }
}
@media (max-width: 900px) {
  .hero-title { font-size: 2.2rem; }
  .hero-photo { width: 180px; height: 180px; }
  .card-section { padding: 2rem 1rem; }
  .project-list { gap: 1.2rem; }
}
@media (max-width: 600px) {
  .navbar { padding: 0.7rem 0; }
  .nav-logo { font-size: 1.3rem; }
  .nav-links { gap: 1rem; }
  .hero-section { padding: 1.5rem 0; border-radius: 1.2rem; }
  .hero-title { font-size: 1.3rem; }
  .hero-photo { width: 100px; height: 100px; border-width: 4px; }
  .card-section { padding: 1rem 0.5rem; border-radius: 1rem; }
  .skills-list { grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); }
}

/* Dark mode toggle button */
.dark-mode-toggle {
  background: none;
  border: none;
  outline: none;
  cursor: pointer;
  font-size: 1.3rem;
  margin-left: 1.5rem;
  color: var(--color-primary);
  border-radius: 50%;
  padding: 0.4em 0.6em;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
  box-shadow: 0 2px 8px var(--color-shadow);
}
.dark-mode-toggle:hover {
  background: var(--color-accent);
  color: #fff;
}
.dark-mode .dark-mode-toggle {
  color: var(--color-accent);
  background: var(--color-bg-card);
}
.dark-mode .dark-mode-toggle:hover {
  background: var(--color-primary);
  color: #fff;
}

/* Transitions for theme */
body, .navbar, .card-section, .project-card, .education-item, .skills-list li, .contact-form input, .contact-form textarea, .footer, .hero-section {
  transition: background 0.3s, color 0.3s, box-shadow 0.3s, border 0.3s;
}

/* --- Mobile Navbar --- */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 2rem;
  color: var(--color-primary);
  cursor: pointer;
  margin-left: 1.2rem;
  z-index: 120;
}
.mobile-menu-toggle.open {
  color: var(--color-accent);
}
@media (max-width: 700px) {
  .nav-links {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    background: var(--color-bg-card);
    flex-direction: column;
    gap: 0;
    box-shadow: 0 8px 32px var(--color-shadow);
    border-radius: 0 0 1.2rem 1.2rem;
    padding: 0.5rem 0;
    display: none;
    z-index: 110;
  }
  .nav-links.mobile {
    display: none;
  }
  .nav-links.mobile.open {
    display: flex;
  }
  .nav-link {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    border-radius: 0;
    text-align: left;
    width: 100%;
  }
  .nav-container {
    position: relative;
  }
  .mobile-menu-toggle {
    display: block;
  }
}
@media (max-width: 700px) {
  .nav-container {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    position: relative;
  }
  .nav-logo {
    order: 1;
  }
  .dark-mode-toggle {
    order: 2;
    margin-left: 0.5rem;
    margin-right: 0;
  }
  .mobile-menu-toggle {
    order: 3;
    margin-left: 0.5rem;
    margin-right: 0.2rem;
    position: static;
  }
}
@media (max-width: 700px) {
  .nav-links {
    width: 100vw;
    left: 50%;
    transform: translateX(-50%);
  }
}
/* Prevent horizontal scroll */
body {
  overflow-x: hidden;
}
/* Responsive tweaks for all sections */
@media (max-width: 700px) {
  .container {
    padding: 0 0.5rem;
  }
  .hero-container {
    flex-direction: column;
    gap: 1.2rem;
    align-items: flex-start;
  }
  .hero-left, .hero-right {
    width: 100%;
    flex: unset;
  }
  .hero-left {
    width: 100%;
    text-align: center;
  }
  .hero-right {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 1rem;
  }
  .hero-photo {
    display: block;
    margin: 0 auto;
    position: static;
  }
  .hero-title {
    font-size: 1.1rem;
  }
  .hero-photo {
    width: 80px;
    height: 80px;
    border-width: 3px;
  }
  .card-section {
    padding: 0.7rem 0.2rem;
    border-radius: 0.7rem;
  }
  .project-list {
    grid-template-columns: 1fr;
    gap: 0.7rem;
  }
  .skills-list {
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 0.7rem;
  }
  .education-item {
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
    align-items: flex-start;
  }
  .education-icon {
    width: 50px;
    height: 50px;
    font-size: 1.2rem;
  }
  .contact-form {
    padding: 0.5rem;
    max-width: 100%;
  }
  .contact-links {
    gap: 0.5rem;
    font-size: 0.95rem;
  }
  .cv-btn {
    padding: 0.5rem 1rem;
    font-size: 0.98rem;
  }
  footer {
    font-size: 0.95rem;
    padding: 1rem 0 0.7rem 0;
  }
}

/* --- Enhanced Contact Section --- */
.contact-container {
  display: flex;
  gap: 3rem;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
}
.contact-info {
  flex: 1;
  min-width: 260px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  padding: 2rem 1rem 2rem 0;
  border-right: 2px solid var(--color-border);
  background: none;
}
.contact-illustration {
  background: linear-gradient(135deg, var(--color-primary) 60%, var(--color-accent) 100%);
  border-radius: 1.5rem;
  padding: 1.2rem 1.5rem;
  margin-bottom: 1.2rem;
  color: #fff;
  box-shadow: 0 4px 16px var(--color-shadow);
  display: flex;
  align-items: center;
  justify-content: center;
}
.contact-info h2 {
  color: var(--color-primary);
  margin-bottom: 0.5rem;
  font-size: 2rem;
  font-weight: 800;
}
.contact-invite {
  color: #444;
  font-size: 1.13rem;
  margin-bottom: 0.5rem;
  margin-top: 0.5rem;
  max-width: 320px;
}
.contact-main {
  flex: 2;
  min-width: 300px;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  padding: 1rem 0 1rem 1rem;
}
@media (max-width: 900px) {
  .contact-container {
    flex-direction: column;
    gap: 1.5rem;
  }
  .contact-info {
    border-right: none;
    border-bottom: 2px solid var(--color-border);
    padding: 1rem 0 1.5rem 0;
    align-items: center;
    text-align: center;
  }
  .contact-main {
    padding: 1.5rem 0 0 0;
  }
}
.dark-mode .project-card {
  background: #232b3a;
  border: 1.5px solid #26304a;
  color: var(--color-text);
}
.dark-mode .project-card:hover {
  background: #26304a;
  border: 1.5px solid var(--color-accent);
}
.dark-mode .project-github {
  background: #232b3a;
  color: var(--color-accent);
  border: 1.5px solid var(--color-accent);
}
.dark-mode .project-github:hover {
  background: var(--color-accent);
  color: #232b3a;
  border-color: var(--color-accent);
}
.dark-mode .contact-form input,
.dark-mode .contact-form textarea {
  background: #232b3a;
  color: var(--color-text);
  border: 1.5px solid #26304a;
}
.dark-mode .contact-form input:focus,
.dark-mode .contact-form textarea:focus {
  border: 1.5px solid var(--color-accent);
}
.dark-mode .contact-form button {
  background: var(--color-accent);
  color: #232b3a;
}
.dark-mode .contact-form button:hover {
  background: var(--color-primary);
  color: #fff;
}
.dark-mode .hero-btn-secondary {
  background: #232b3a;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
}
.dark-mode .hero-btn-secondary:hover {
  background: var(--color-accent);
  color: #232b3a;
  border-color: var(--color-accent);
}
.dark-mode .contact-invite,
.dark-mode .project-card p,
.dark-mode .education-description,
.dark-mode .skills-list li,
.dark-mode .contact-links a,
.dark-mode .education-year {
  color: #fff !important;
}

#about.card-section {
  min-height: 50vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
@media (max-width: 900px) {
  #about.card-section {
    min-height: 35vh;
  }
}
@media (max-width: 600px) {
  #about.card-section {
    min-height: 20vh;
  }
}

.hero-section,
.card-section {
  scroll-margin-top: 100px;
}
@media (max-width: 700px) {
  .hero-section,
  .card-section {
    scroll-margin-top: 70px;
  }
}

/* --- Enhanced Skills Section --- */
.skills-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 1.5rem;
  position: relative;
}
.skills-header .skills-icon {
  color: #1565c0;
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  filter: drop-shadow(0 2px 8px #90caf9);
  position: relative;
  z-index: 2;
}
.skills-header .skills-icon::after {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 50%;
  background: radial-gradient(circle, #64b5f6 0%, rgba(100,181,246,0.12) 70%, transparent 100%);
  z-index: -1;
  filter: blur(2px);
  opacity: 0.7;
}
.skills-header .skills-highlight {
  width: 60px;
  height: 6px;
  background: linear-gradient(90deg, #1565c0 0%, #64b5f6 100%);
  border-radius: 3px;
  margin: 0.5rem auto 0 auto;
}
.skills-list li {
  background: linear-gradient(135deg, #fff 60%, #e3eaf3 100%);
  box-shadow: 0 2px 8px rgba(21,101,192,0.06);
  border: 2px solid #e3eaf3;
  transition: transform 0.6s cubic-bezier(0.22, 0.61, 0.36, 1), box-shadow 0.6s cubic-bezier(0.22, 0.61, 0.36, 1), border 0.6s cubic-bezier(0.22, 0.61, 0.36, 1), background 0.6s cubic-bezier(0.22, 0.61, 0.36, 1);
  position: relative;
  z-index: 1;
  overflow: hidden;
}
.skills-list li::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: 1.2rem;
  background: linear-gradient(120deg, #64b5f6 0%, #1565c0 100%);
  opacity: 0;
  transition: opacity 0.5s;
  z-index: 0;
}
.skills-list li:hover::before {
  opacity: 0.18;
}
.skills-list li:hover {
  transform: translateY(-4px) scale(1.03) rotate(-0.5deg);
  box-shadow: 0 6px 18px rgba(21,101,192,0.13);
  background: linear-gradient(135deg, #e3eaf3 0%, #64b5f6 100%);
  border-color: #64b5f6;
}
.skills-list li span, .skills-list li {
  position: relative;
  z-index: 1;
}
#skills.card-section {
  background: linear-gradient(120deg, #f6faff 60%, #e3eaf3 100%);
  position: relative;
  overflow: visible;
}
#skills.card-section::before {
  content: '';
  position: absolute;
  top: -40px;
  right: -60px;
  width: 180px;
  height: 180px;
  background: radial-gradient(circle, #64b5f6 0%, transparent 80%);
  opacity: 0.18;
  z-index: 0;
  pointer-events: none;
}
@media (max-width: 700px) {
  .skills-header .skills-icon {
    font-size: 2rem;
  }
  #skills.card-section::before {
    width: 100px;
    height: 100px;
    top: -20px;
    right: -30px;
  }
}
.dark-mode #skills.card-section {
  background: linear-gradient(120deg, #181f2c 60%, #232b3a 100%);
}
.dark-mode .skills-header .skills-icon {
  color: var(--color-accent);
  filter: drop-shadow(0 2px 8px var(--color-primary));
}
.dark-mode .skills-header .skills-icon::after {
  background: radial-gradient(circle, var(--color-accent) 0%, rgba(100,181,246,0.18) 70%, transparent 100%);
}
.dark-mode .skills-header .skills-highlight {
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-primary) 100%);
}
.dark-mode .skills-list li {
  background: linear-gradient(135deg, #232b3a 60%, #181f2c 100%);
  border: 2px solid #26304a;
}
.dark-mode .skills-list li:hover {
  background: linear-gradient(135deg, #26304a 0%, var(--color-accent) 100%);
  border-color: var(--color-accent);
  box-shadow: 0 6px 18px rgba(100,181,246,0.13);
  transform: translateY(-4px) scale(1.03) rotate(-0.5deg);
}
.dark-mode .skills-list li::before {
  background: linear-gradient(120deg, var(--color-accent) 0%, var(--color-primary) 100%);
}

/* --- Certificates Section --- */
.certificate-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 2rem;
}
@media (max-width: 900px) {
  .certificate-list {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }
}
.certificate-card {
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-card) 100%);
  border-radius: 1.3rem;
  box-shadow: 0 2px 12px rgba(21,101,192,0.07);
  padding: 1.5rem 1.2rem;
  border: 1.5px solid #e3eaf3;
  transition: box-shadow 0.4s, border 0.4s, background 0.4s;
  min-height: 120px;
}
.certificate-card:hover {
  box-shadow: 0 8px 32px rgba(21,101,192,0.13);
  border: 1.5px solid #1565c0;
  background: #fff;
}
.certificate-icon {
  font-size: 2.5rem;
  color: #ff9900; /* AWS orange */
  margin-right: 1.5rem;
  flex-shrink: 0;
  filter: drop-shadow(0 2px 8px #ffd580);
}
.certificate-content h3 {
  color: #1565c0;
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0 0 0.3rem 0;
}
.certificate-org {
  color: #1976d2;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.2rem;
}
.certificate-year {
  color: #64b5f6;
  font-size: 0.98rem;
  font-weight: 600;
  background: rgba(100, 181, 246, 0.1);
  padding: 0.2rem 0.7rem;
  border-radius: 0.7rem;
  display: inline-block;
}
.certificate-link {
  margin-left: 0.5em;
  color: #1565c0;
  font-size: 1em;
  vertical-align: middle;
  display: inline-flex;
  align-items: center;
  transition: color 0.2s;
}
.certificate-link:hover {
  color: #ff9900;
}
.dark-mode .certificate-link {
  color: var(--color-accent);
}
.dark-mode .certificate-link:hover {
  color: #ffb74d;
}
@media (max-width: 700px) {
  .certificate-list {
    grid-template-columns: 1fr;
    gap: 0.7rem;
  }
  .certificate-card {
    padding: 1rem 0.7rem;
    border-radius: 0.7rem;
  }
  .certificate-icon {
    font-size: 1.5rem;
    margin-right: 0.7rem;
  }
}
.dark-mode .certificate-card {
  background: #232b3a;
  border: 1.5px solid #26304a;
  color: var(--color-text);
}
.dark-mode .certificate-card:hover {
  background: #26304a;
  border: 1.5px solid var(--color-accent);
}
.dark-mode .certificate-icon {
  color: #ffb74d;
  filter: drop-shadow(0 2px 8px #ffecb3);
}
.dark-mode .certificate-content h3 {
  color: var(--color-accent);
}
.dark-mode .certificate-org {
  color: var(--color-primary);
}
.dark-mode .certificate-year {
  color: #fff;
  background: rgba(100, 181, 246, 0.18);
}

@media (max-width: 400px) {
  .container {
    padding: 0 0.2rem;
  }
  .navbar {
    padding: 0.4rem 0;
  }
  .nav-logo {
    font-size: 1rem;
  }
  .nav-link {
    font-size: 0.9rem;
    padding: 0.4rem 0.7rem;
  }
  .hero-section {
    padding: 0.5rem 0;
    border-radius: 0.5rem;
    min-height: 10vh;
  }
  .hero-title {
    font-size: 0.9rem;
  }
  .hero-photo {
    width: 50px;
    height: 50px;
    border-width: 2px;
  }
  .card-section {
    padding: 0.3rem 0.1rem;
    border-radius: 0.3rem;
  }
  .project-list {
    gap: 0.3rem;
  }
  .project-card {
    padding: 0.7rem 0.3rem 1rem 0.3rem;
    border-radius: 0.5rem;
    min-height: 80px;
  }
  .project-card h3, .certificate-content h3 {
    font-size: 0.9rem;
    word-break: break-word;
  }
  .project-card p, .certificate-org, .certificate-year {
    font-size: 0.85rem;
    word-break: break-word;
  }
  .project-github {
    width: 1.2em;
    height: 1.2em;
    font-size: 0.9em;
    padding: 0.1em 0.2em;
  }
  .skills-list {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }
  .skills-list li {
    padding: 0.7rem 0.5rem;
    font-size: 0.85rem;
  }
  .education-item {
    padding: 0.5rem;
    border-radius: 0.5rem;
    gap: 0.5rem;
  }
  .education-icon {
    width: 30px;
    height: 30px;
    font-size: 0.8rem;
  }
  .contact-form {
    padding: 0.2rem;
    gap: 0.5rem;
  }
  .contact-form input, .contact-form textarea {
    font-size: 0.85rem;
    padding: 0.5rem 0.7rem;
  }
  .contact-form button {
    font-size: 0.9rem;
    padding: 0.4rem 0.7rem;
  }
  .contact-links {
    font-size: 0.85rem;
    gap: 0.2rem;
  }
  .cv-btn {
    font-size: 0.9rem;
    padding: 0.3rem 0.7rem;
  }
  .certificate-list {
    gap: 0.3rem;
  }
  .certificate-card {
    padding: 0.5rem 0.2rem;
    border-radius: 0.3rem;
    min-height: 60px;
  }
  .certificate-icon {
    font-size: 1rem;
    margin-right: 0.3rem;
  }
  .certificate-link {
    font-size: 0.9em;
    margin-left: 0.2em;
  }
  .contact-container {
    gap: 0.5rem;
  }
  .contact-info h2 {
    font-size: 1.1rem;
  }
  .contact-invite {
    font-size: 0.85rem;
    max-width: 180px;
  }
  .contact-main {
    padding: 0.2rem 0 0.2rem 0.2rem;
  }
  footer {
    font-size: 0.8rem;
    padding: 0.3rem 0 0.2rem 0;
  }
}