:root {
  --primary-color: #0277bd;
  --secondary-color: #01579b;
  --accent-color: #ff6f00;
  --light-blue: #e1f5fe;
  --light-green: #e8f5e9;
  --light-orange: #fff3e0;
  --light-purple: #f3e5f5;
  --light-cyan: #e0f7fa;
  --dark-color: #333;
  --light-color: #f8f9fa;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  scroll-behavior: smooth;
  background-color: var(--light-color);
  color: var(--dark-color);
  overflow-x: hidden;
}

.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  color: white;
}

.loading-screen p {
  margin-top: 20px;
  font-size: 1.2rem;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 5px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.navbar {
  transition: all 0.3s ease;
  padding: 15px 0;
}

.navbar.scrolled {
  background-color: rgba(255, 255, 255, 0.95) !important;
  backdrop-filter: blur(10px);
  padding: 10px 0;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
  font-size: 1.5rem;
  color: var(--primary-color) !important;
}

.navbar-nav a {
  transition: color 0.3s, transform 0.3s;
  position: relative;
  font-weight: 500;
  margin: 0 10px;
}

.navbar-nav a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-color);
  transition: width 0.3s ease;
}

.navbar-nav a:hover {
  color: var(--secondary-color) !important;
  transform: translateY(-2px);
}

.navbar-nav a:hover::after {
  width: 100%;
}

section {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 100px 20px;
  position: relative;
}

#hero {
  background: linear-gradient(135deg, var(--light-blue), #b3e5fc);
  position: relative;
  overflow: hidden;
}

#hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="%230277bd" fill-opacity="0.1" d="M0,224L48,213.3C96,203,192,181,288,181.3C384,181,480,203,576,192C672,181,768,139,864,138.7C960,139,1056,181,1152,186.7C1248,192,1344,160,1392,144L1440,128L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>');
  background-size: cover;
  background-position: bottom;
  animation: wave 20s linear infinite;
}

@keyframes wave {
  0% { background-position-x: 0; }
  100% { background-position-x: 1440px; }
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-content h1 {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.hero-content span {
  color: var(--primary-color);
  position: relative;
  background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.typing-text::after {
  content: "|";
  animation: blink 1s infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.lead {
  font-size: 1.3rem;
  max-width: 600px;
  margin: 0 auto;
}

.floating-elements {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.floating-element {
  position: absolute;
  font-size: 2rem;
  color: rgba(2, 119, 189, 0.2);
  animation: float 6s ease-in-out infinite;
}

.floating-element.el-1 {
  top: 20%;
  left: 10%;
  animation-delay: 0s;
}

.floating-element.el-2 {
  top: 60%;
  left: 80%;
  animation-delay: 1s;
}

.floating-element.el-3 {
  top: 80%;
  left: 20%;
  animation-delay: 2s;
}

.floating-element.el-4 {
  top: 40%;
  left: 85%;
  animation-delay: 3s;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(10deg); }
}

.scroll-indicator {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  color: var(--primary-color);
  font-size: 0.9rem;
  animation: bounce 2s infinite;
}

.arrow {
  width: 2px;
  height: 20px;
  background-color: var(--primary-color);
  margin-top: 5px;
  position: relative;
}

.arrow::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: -3px;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--primary-color);
  border-bottom: 2px solid var(--primary-color);
  transform: rotate(45deg);
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0) translateX(-50%); }
  40% { transform: translateY(-10px) translateX(-50%); }
  60% { transform: translateY(-5px) translateX(-50%); }
}

.btn-custom {
  background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
  color: white;
  border: none;
  padding: 12px 30px;
  border-radius: 30px;
  transition: all 0.3s;
  text-decoration: none;
  display: inline-block;
  font-weight: 600;
  box-shadow: 0 4px 15px rgba(2, 119, 189, 0.3);
  position: relative;
  overflow: hidden;
}

.btn-custom::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
}

.btn-custom:hover::before {
  left: 100%;
}

.btn-custom:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(2, 119, 189, 0.4);
  color: white;
}

.btn-outline-custom {
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
  background: transparent;
  padding: 10px 28px;
  border-radius: 30px;
  transition: all 0.3s;
  text-decoration: none;
  display: inline-block;
  font-weight: 600;
}

.btn-outline-custom:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(2, 119, 189, 0.3);
}

.section-title {
  position: relative;
  margin-bottom: 3rem;
  font-size: 2.5rem;
  font-weight: 700;
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
  border-radius: 2px;
}

#about {
  background: linear-gradient(135deg, var(--light-green), #c8e6c9);
}

.about-item {
  padding: 30px 20px;
  transition: all 0.3s ease;
  border-radius: 15px;
  height: 100%;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(10px);
}

.about-item:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
  background: white;
}

.icon-wrapper {
  margin-bottom: 20px;
}

.timeline {
  margin-top: 20px;
  text-align: left;
}

.timeline-item {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid #eee;
}

.year {
  font-weight: bold;
  color: var(--primary-color);
}

.hobbies {
  margin-top: 15px;
}

.hobby-tag {
  display: inline-block;
  background: var(--light-blue);
  color: var(--primary-color);
  padding: 5px 10px;
  border-radius: 20px;
  margin: 5px;
  font-size: 0.8rem;
  font-weight: 600;
}

#skills {
  background: linear-gradient(135deg, var(--light-cyan), #b2ebf2);
}

.skill-category {
  margin-bottom: 2rem;
  padding: 25px;
  border-radius: 15px;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.skill-category:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  background: white;
}

.skill-item {
  margin-bottom: 1.5rem;
}

.skill-name {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.progress {
  height: 10px;
  border-radius: 5px;
  background-color: #e9ecef;
  overflow: hidden;
}

.progress-bar {
  background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
  border-radius: 5px;
  transition: width 1.5s ease-in-out;
}

.skill-level {
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--primary-color);
}

#projects {
  background: linear-gradient(135deg, var(--light-orange), #ffe0b2);
}

.project-card {
  border-radius: 15px;
  transition: all 0.3s ease;
  border: none;
  overflow: hidden;
  height: 100%;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
}

.project-card:hover {
  transform: translateY(-15px) scale(1.02);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
  background: white;
}

.project-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  color: white;
  font-size: 2rem;
}

.project-tags {
  margin-top: 15px;
}

.badge {
  margin-right: 5px;
  margin-bottom: 5px;
  font-size: 0.7rem;
  padding: 5px 10px;
  border-radius: 15px;
}

.btn-project {
  background: transparent;
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
  padding: 1px 20px;
  border-radius: 20px;
  transition: all 0.3s;
  font-weight: 600;
}

.btn-project:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-2px);
}

#contact {
  background: linear-gradient(135deg, var(--light-purple), #e1bee7);
}

.contact-card {
  border-radius: 15px;
  transition: all 0.3s ease;
  border: none;
  height: 100%;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
}

.contact-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
  background: white;
}

.contact-icon {
  width: 60px;
  height: 60px;
  background: rgba(2, 119, 189, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 15px;
}

.contact-form-card {
  border-radius: 15px;
  border: none;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
}

.form-control {
  border-radius: 10px;
  border: 1px solid #e0e0e0;
  padding: 12px 15px;
  transition: all 0.3s;
}

.form-control:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.2rem rgba(2, 119, 189, 0.25);
}

footer {
  background: linear-gradient(135deg, #2c3e50, #34495e) !important;
}

.social-links a {
  display: inline-block;
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  text-align: center;
  line-height: 40px;
  color: white;
  margin-left: 10px;
  transition: all 0.3s;
}

.social-links a:hover {
  background: var(--primary-color);
  transform: translateY(-3px);
}

.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
  color: white;
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
  z-index: 1000;
  box-shadow: 0 4px 15px rgba(2, 119, 189, 0.3);
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(2, 119, 189, 0.4);
}

@media (max-width: 768px) {
  section {
    padding: 80px 15px;
    min-height: auto;
  }
  
  .hero-content h1 {
    font-size: 2.5rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .floating-elements {
    display: none;
  }
  
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 45px;
    height: 45px;
  }
}