:root {
  --mainColor: #f5f5f5;
  --secondaryColor: #ffffff;
  --accentColor: #0066cc;
  --accentColorDark: #0052a3;
  --borderColor: #e0e0e0;
  --mainText: #1a1a1a;
  --secondaryText: #666666;
  --lightText: #999999;
  --previewBg: rgba(255, 255, 255, 0.7);
  --previewShadow: rgba(0, 0, 0, 0.05);
  --glassEffect: rgba(255, 255, 255, 0.8);
  --glassBorder: rgba(255, 255, 255, 0.2);
}

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

html,
body {
  padding: 0;
  margin: 0;
  scroll-behavior: smooth;
}

h1,
h2,
h3,
h4,
h5,
h6,
strong {
  color: var(--mainText);
  font-family: "Inter", sans-serif;
  font-weight: 700;
  letter-spacing: -0.5px;
}

p,
li,
span,
label,
input,
textarea {
  color: var(--secondaryText);
  font-family: "Inter", sans-serif;
  font-weight: 400;
}

a {
  text-decoration: none;
  color: var(--accentColor);
  transition: color 0.3s ease;
}

a:hover {
  color: var(--accentColorDark);
}

ul {
  list-style: none;
}

body * {
  transition: 0.3s ease;
}

h1 {
  font-size: 56px;
  line-height: 1.2;
}

h2 {
  font-size: 42px;
  line-height: 1.2;
  margin-bottom: 40px;
}

h3 {
  font-size: 24px;
  line-height: 1.3;
  margin-bottom: 20px;
}

h4 {
  font-size: 20px;
  line-height: 1.4;
}

h5 {
  font-size: 18px;
}

h6 {
  font-size: 16px;
}

/* Container */
.container {
  width: 80%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px;
}

/* Navigation */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 40px;
  border-bottom: 1px solid var(--borderColor);
}

.nav-brand {
  font-size: 24px;
  font-weight: 700;
  color: var(--accentColor);
}

.nav-links {
  display: flex;
  gap: 40px;
  list-style: none;
}

.nav-links a {
  color: var(--mainText);
  font-weight: 500;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accentColor);
  transition: width 0.3s ease;
}

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

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--mainColor) 0%, var(--secondaryColor) 100%);
  padding: 60px 0 100px;
  border-bottom: 1px solid var(--borderColor);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-top: 60px;
  text-align: center;
}

.hero-text {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.hero-text h1 {
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--mainText), var(--accentColor));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 20px;
  color: var(--accentColor);
  font-weight: 600;
  margin-bottom: 16px;
}

.hero-description {
  font-size: 16px;
  line-height: 1.6;
  color: var(--secondaryText);
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
}

/* Buttons */
.btn {
  padding: 12px 28px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
  display: inline-block;
  transition: all 0.3s ease;
  border: 2px solid transparent;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--accentColor);
  color: white;
}

.btn-primary:hover {
  background-color: var(--accentColorDark);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 102, 204, 0.3);
}

.btn-secondary {
  background-color: transparent;
  color: var(--accentColor);
  border: 2px solid var(--accentColor);
}

.btn-secondary:hover {
  background-color: var(--accentColor);
  color: white;
}

.cta-button {
  padding: 8px 16px;
  background-color: var(--accentColor);
  color: white;
  border-radius: 6px;
  font-weight: 600;
}

.cta-button:hover {
  background-color: var(--accentColorDark);
}

/* Hero Image */
.hero-image {
  display: flex;
  justify-content: center;
}

#profile-pic {
  width: 280px;
  height: 280px;
  border-radius: 16px;
  object-fit: cover;
  border: 2px solid var(--borderColor);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease;
}

#profile-pic:hover {
  transform: scale(1.02);
}

/* Theme Selector */
.theme-selector {
  background-color: var(--secondaryColor);
  padding: 40px 0;
  border-bottom: 1px solid var(--borderColor);
}

.theme-selector .container {
  text-align: center;
}

.theme-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--mainText);
  margin-bottom: 20px;
}

#theme-options {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 16px;
}

.theme-dot {
  height: 36px;
  width: 36px;
  border-radius: 50%;
  border: 2px solid var(--borderColor);
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.theme-dot:hover {
  border-color: var(--accentColor);
  transform: scale(1.1);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
}

#light-mode {
  background-color: #fff;
}

#blue-mode {
  background-color: #192734;
}

#green-mode {
  background-color: #78866b;
}

#purple-mode {
  background-color: #7e4c74;
}

.theme-note {
  font-size: 12px;
  color: var(--lightText);
  font-style: italic;
}

/* About Section */
.about {
  padding: 100px 0;
  background-color: var(--secondaryColor);
  border-bottom: 1px solid var(--borderColor);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.about-text {
  background: var(--glassEffect);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glassBorder);
  padding: 40px;
  border-radius: 12px;
  line-height: 1.8;
}

.about-text p {
  margin-bottom: 20px;
  font-size: 16px;
}

.about-text p:last-child {
  margin-bottom: 0;
}

/* Skills Section */
.skills {
  padding: 100px 0;
  background: linear-gradient(135deg, var(--mainColor) 0%, var(--secondaryColor) 100%);
  border-bottom: 1px solid var(--borderColor);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 40px;
}

.skill-category {
  background: var(--glassEffect);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glassBorder);
  padding: 32px;
  border-radius: 12px;
  transition: all 0.3s ease;
}

.skill-category:hover {
  border-color: var(--accentColor);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  transform: translateY(-4px);
}

.skill-category h3 {
  color: var(--accentColor);
  margin-bottom: 24px;
  font-size: 18px;
}

.skill-category ul {
  list-style: none;
}

.skill-category li {
  padding: 8px 0;
  padding-left: 24px;
  position: relative;
  font-size: 14px;
  color: var(--secondaryText);
}

.skill-category li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accentColor);
  font-weight: 700;
}

/* Footer */
.footer {
  background-color: var(--mainColor);
  padding: 40px 0;
  border-top: 1px solid var(--borderColor);
  text-align: center;
}

.footer p {
  margin: 8px 0;
  font-size: 14px;
  color: var(--secondaryText);
}

.footer a {
  color: var(--accentColor);
}

/* Responsive Design */
@media screen and (max-width: 768px) {
  .container {
    padding: 0 20px;
  }

  h1 {
    font-size: 36px;
  }

  h2 {
    font-size: 28px;
    margin-bottom: 24px;
  }

  .navbar {
    flex-direction: column;
    gap: 16px;
  }

  .nav-links {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .hero {
    padding: 40px 0 60px;
  }

  .hero-content {
    grid-template-columns: 1fr;
    gap: 40px;
    margin-top: 30px;
  }

  #profile-pic {
    width: 200px;
    height: 200px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    text-align: center;
  }

  .skill-category {
    padding: 24px;
  }

  .about-text {
    padding: 24px;
  }
}

@media screen and (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  h1 {
    font-size: 28px;
  }

  h2 {
    font-size: 22px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

  .hero-description {
    font-size: 14px;
  }

  #profile-pic {
    width: 160px;
    height: 160px;
  }
}