:root {
    --primary: #1a1a1a;
    --secondary: #e8e8e8;
    --accent: #2ecc71;
    --primary-dark: #121212;
    --secondary-dark: #1e1e24;
    --primary-blue: #4361ee;
    --primary-purple: #7b2cbf;
    --accent-blue: #3a86ff;
    --text-light: #f8f9fa;
    --text-muted: #b0b0b0;
    --card-bg: rgba(30, 30, 36, 0.7);
    --gradient: linear-gradient(120deg, var(--primary-blue), var(--primary-purple));
    --transition-speed: 0.3s;
}

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

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: var(--primary-dark);
    color: var(--text-light);
    line-height: 1.6;
    padding: 0;
    max-width: 1200px;
    margin: 0 auto;
    letter-spacing: 0.01em;
    font-weight: 400;
}

header {
    padding: 3rem 2rem;
    text-align: center;
    background: var(--gradient);
    border-radius: 0 0 15px 15px;
    margin-bottom: 2rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

header h1 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    letter-spacing: 0.5px;
    font-weight: 700;
}

header p {
    font-size: 1.2rem;
    color: var(--text-light);
    opacity: 0.9;
    font-weight: 400;
}

.contact-header {
    margin-top: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.header-links {
    display: flex;
    gap: 1.5rem;
    margin-top: 0.5rem;
}

.header-links a {
    color: var(--text-light);
    font-size: 1.4rem;
    transition: transform var(--transition-speed), color var(--transition-speed);
}

.header-links a:hover {
    color: var(--text-light);
    transform: translateY(-3px);
}

nav {
    margin: 0 auto 2rem auto;
    background-color: var(--secondary-dark);
    border-radius: 10px;
    padding: 0.5rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    position: sticky;
    top: 10px;
    z-index: 100;
    max-width: 90%;
    transition: box-shadow var(--transition-speed);
}

nav:hover {
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.nav-links {
    display: flex;
    justify-content: space-evenly;
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-links li {
    margin: 0;
    flex: 1;
    text-align: center;
}

.nav-links a {
    display: block;
    color: var(--text-light);
    text-decoration: none;
    padding: 0.8rem 0.5rem;
    border-radius: 6px;
    font-weight: 500;
    transition: all var(--transition-speed) ease;
    position: relative;
    overflow: hidden;
    letter-spacing: 0.5px;
}

.nav-links a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background: var(--gradient);
    transition: all var(--transition-speed) ease;
    transform: translateX(-50%);
}

.nav-links a:hover {
    background-color: rgba(75, 97, 238, 0.1);
    color: var(--primary-blue);
}

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

.nav-links a.active {
    background: var(--gradient);
    color: white;
}

section {
    padding: 2rem;
    margin-bottom: 2.5rem;
    background-color: var(--secondary-dark);
    border-radius: 12px;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.15);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

section:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.7rem;
    border-bottom: 2px solid var(--primary-purple);
    color: var(--accent-blue);
    font-weight: 600;
    letter-spacing: 0.5px;
}

.education-item {
    padding: 1.5rem;
    border-radius: 10px;
    background-color: var(--card-bg);
    transition: transform var(--transition-speed);
}

.education-item:hover {
    transform: translateY(-3px);
}

.education-item h3 {
    color: var(--primary-blue);
    margin-bottom: 0.8rem;
    font-weight: 600;
    font-size: 1.4rem;
}

.degree {
    font-weight: 600;
    margin-bottom: 0.5rem;
    letter-spacing: 0.3px;
}

.details {
    color: var(--text-muted);
    font-style: italic;
    margin-bottom: 1.2rem;
    font-size: 0.95rem;
    letter-spacing: 0.3px;
}

.coursework h4 {
    margin-bottom: 0.7rem;
    color: var(--text-light);
    font-weight: 500;
}

.coursework p {
    line-height: 1.7;
    font-size: 0.95rem;
}

.experience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.8rem;
}

.experience-card {
    background-color: var(--card-bg);
    border-radius: 10px;
    padding: 1.8rem;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.experience-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.experience-card h3 {
    color: var(--primary-blue);
    margin-bottom: 0.7rem;
    font-weight: 600;
    font-size: 1.3rem;
    line-height: 1.4;
}

.duration {
    color: var(--text-muted);
    font-style: italic;
    margin-bottom: 1.2rem;
    font-size: 0.9rem;
    letter-spacing: 0.3px;
}

.project-card {
    background-color: var(--card-bg);
    border-radius: 10px;
    padding: 1.8rem;
    margin-bottom: 1.2rem;
    border-left: 4px solid var(--primary-purple);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.project-card:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.project-card h3 {
    color: var(--primary-blue);
    margin-bottom: 1rem;
    font-weight: 600;
    font-size: 1.3rem;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.skill-card {
    background-color: var(--card-bg);
    border-radius: 10px;
    padding: 1.8rem;
    transition: transform var(--transition-speed);
    height: 100%;
}

.skill-card:hover {
    transform: translateY(-5px);
}

.skill-card h3 {
    color: var(--primary-blue);
    margin-bottom: 1.2rem;
    text-align: center;
    padding-bottom: 0.7rem;
    border-bottom: 1px solid var(--primary-purple);
    font-weight: 600;
    font-size: 1.3rem;
}

ul {
    list-style-position: inside;
    padding-left: 0.5rem;
}

li {
    margin-bottom: 0.8rem;
    position: relative;
    line-height: 1.5;
    font-size: 0.95rem;
}

li::marker {
    color: var(--primary-purple);
}

a {
    color: var(--accent-blue);
    text-decoration: none;
    transition: all var(--transition-speed) ease;
}

a:hover {
    opacity: 0.8;
}

footer {
    text-align: center;
    padding: 2rem 1rem;
    margin-top: 3rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    letter-spacing: 0.5px;
}

footer p::before {
    content: '©';
    margin-right: 3px;
}

#guestbook {
  background: var(--card-bg, #232946);
  border-radius: 12px;
  padding: 2rem 1.5rem;
  margin: 2rem auto;
  max-width: 500px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
}

#guestbook h2 {
  color: var(--primary-blue, #3f8efc);
  margin-bottom: 1.2rem;
  text-align: center;
}

#comment-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

#comment-form input[type="text"],
#comment-form textarea {
  background: var(--secondary-dark, #121629);
  color: var(--text-light, #fff);
  border: 1px solid var(--primary-blue, #3f8efc);
  border-radius: 6px;
  padding: 0.9rem 1rem;
  font-size: 1rem;
  transition: border 0.2s;
}

#comment-form input[type="text"]:focus,
#comment-form textarea:focus {
  outline: none;
  border: 1.5px solid var(--primary-purple, #a259f7);
}

#comment-form textarea {
  min-height: 80px;
  resize: vertical;
}

#comment-form button {
  background: linear-gradient(90deg, var(--primary-blue, #3f8efc), var(--primary-purple, #a259f7));
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 0.9rem 1.2rem;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  box-shadow: 0 2px 8px rgba(63,142,252,0.08);
}

#comment-form button:hover {
  background: linear-gradient(90deg, var(--primary-purple, #a259f7), var(--primary-blue, #3f8efc));
  transform: translateY(-2px) scale(1.03);
}

/* Remove button animation/checkmark/spinner styles */
#comment-form button.circle-transition {
  width: auto;
  height: auto;
  border-radius: 6px;
  padding: 0.9rem 1.2rem;
  min-width: unset;
  transition: none;
  display: inline-block;
  align-items: unset;
  justify-content: unset;
  font-size: 1.1rem;
}

#comment-form button .spinner,
#comment-form button .checkmark,
#comment-form button.checkmark-success {
  display: none !important;
}

#comments .comment {
  background: var(--secondary-dark, #121629);
  border-radius: 6px;
  padding: 1rem;
  margin-bottom: 1rem;
  color: var(--text-light, #fff);
  box-shadow: 0 2px 8px rgba(63,142,252,0.04);
}

#comments .comment strong {
  color: var(--primary-blue, #3f8efc);
}

#comments .comment small {
  color: var(--text-muted, #b8c1ec);
  display: block;
  margin-top: 0.3rem;
  font-size: 0.92em;
}

/* Section Overview Styles */
.section-overview {
  background: var(--card-bg, #232946);
  padding: 1rem 0;
  margin-bottom: 1.5rem;
  border-radius: 0 0 12px 12px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.04);
  text-align: center;
}

.section-overview ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: inline-flex;
  gap: 2rem;
}

.section-overview li {
  display: inline;
}

.section-overview a {
  color: var(--primary-blue, #3f8efc);
  font-weight: 600;
  text-decoration: none;
  font-size: 1.1rem;
  transition: color 0.2s;
}

.section-overview a:hover {
  color: var(--primary-purple, #a259f7);
  text-decoration: underline;
}

/* Pagination styles */
.pagination {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.page-btn {
  background: var(--secondary-dark, #121629);
  color: var(--primary-blue, #3f8efc);
  border: 1.5px solid var(--primary-blue, #3f8efc);
  border-radius: 6px;
  padding: 0.4em 1em;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.page-btn.active,
.page-btn:hover {
  background: var(--primary-blue, #3f8efc);
  color: #fff;
}

@media (max-width: 768px) {
    .experience-grid, .skills-grid {
        grid-template-columns: 1fr;
    }
    
    header h1 {
        font-size: 2.3rem;
    }
    
    section {
        padding: 1.5rem;
    }
}

@media (max-width: 600px) {
    nav {
        padding: 0.3rem;
    }
    
    .nav-links {
        flex-direction: row;
        flex-wrap: wrap;
    }
    
    .nav-links li {
        flex: 1 0 50%;
        margin-bottom: 0.3rem;
    }
    
    .nav-links a {
        padding: 0.5rem 0.3rem;
        font-size: 0.9rem;
    }
}