:root {
    --primary-color: #a8b2bd;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --bg-color: #2c3842;
    --text-color: #e8eaed;
    --card-bg: #1e2529;
    --education-color: #3498db;
    --work-color: #2ecc71;
    --achievement-color: #f39c12;
    --personal-color: #9b59b6;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header Styles */
header {
    text-align: center;
    padding: 2rem 0;
}

.profile-photo {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--secondary-color);
    margin-bottom: 1rem;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.bio {
    font-size: 1.1rem;
    color: #9ca3af;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Link Cards */
.links-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 2rem;
}

.link-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-decoration: none;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.link-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
}

.link-icon {
    font-size: 2rem;
    width: 50px;
    text-align: center;
}

.link-text {
    font-size: 1.2rem;
    font-weight: 500;
}

/* Timeline Styles */
.filter-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin: 2rem 0;
}

.filter-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 25px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.filter-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.filter-btn.active {
    transform: scale(1.05);
}

.filter-btn.all {
    background-color: #3d4f5c;
    color: white;
}

.filter-btn.education {
    background-color: var(--education-color);
    color: white;
}

.filter-btn.work {
    background-color: var(--work-color);
    color: white;
}

.filter-btn.achievement {
    background-color: var(--achievement-color);
    color: white;
}

.filter-btn.personal {
    background-color: var(--personal-color);
    color: white;
}

.timeline {
    position: relative;
    padding: 2rem 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--secondary-color);
}

.milestone {
    position: relative;
    padding-left: 100px;
    margin-bottom: 2rem;
    transition: opacity 0.3s, transform 0.3s;
}

.milestone.hidden {
    display: none;
}

.milestone-marker {
    position: absolute;
    left: 40px;
    top: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 3px solid var(--card-bg);
    z-index: 1;
}

.milestone.education .milestone-marker {
    background-color: var(--education-color);
}

.milestone.work .milestone-marker {
    background-color: var(--work-color);
}

.milestone.achievement .milestone-marker {
    background-color: var(--achievement-color);
}

.milestone.personal .milestone-marker {
    background-color: var(--personal-color);
}

.milestone-content {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    position: relative;
}

.milestone-logo {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    max-width: 80px;
    max-height: 80px;
    object-fit: contain;
    border-radius: 8px;
}

.milestone-time {
    font-size: 0.9rem;
    color: #9ca3af;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.milestone-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-color);
    padding-right: 100px; /* Make room for logo */
}

.milestone-title a {
    color: var(--secondary-color);
    text-decoration: none;
}

.milestone-title a:hover {
    text-decoration: underline;
}

.milestone-details {
    list-style-position: inside;
    margin-left: 0;
}

.milestone-details li {
    margin-bottom: 0.5rem;
    color: #c1c7cd;
}

.milestone-details a {
    color: var(--secondary-color);
    text-decoration: none;
}

.milestone-details a:hover {
    text-decoration: underline;
}

/* Contact Card */
.contact-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    max-width: 500px;
    margin: 2rem auto;
}

.contact-card h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-color);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 8px;
    background: var(--bg-color);
}

.contact-icon {
    font-size: 1.5rem;
    width: 40px;
    text-align: center;
    color: var(--secondary-color);
}

.contact-info {
    flex: 1;
}

.contact-label {
    font-size: 0.85rem;
    color: #9ca3af;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.contact-value {
    font-size: 1.1rem;
    color: var(--text-color);
}

.contact-value a {
    color: var(--secondary-color);
    text-decoration: none;
}

.contact-value a:hover {
    text-decoration: underline;
}

/* Navigation */
nav {
    text-align: center;
    margin-top: 3rem;
}

.back-link {
    display: inline-block;
    padding: 0.75rem 2rem;
    background: var(--secondary-color);
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 600;
    transition: background-color 0.2s, transform 0.2s;
}

.back-link:hover {
    background: #2980b9;
    transform: translateY(-2px);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    h1 {
        font-size: 2rem;
    }

    .bio {
        font-size: 1rem;
    }

    .filter-buttons {
        gap: 0.5rem;
    }

    .filter-btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }

    .timeline::before {
        left: 20px;
    }

    .milestone {
        padding-left: 60px;
    }

    .milestone-marker {
        left: 10px;
    }

    .link-card {
        padding: 1rem;
    }

    .link-icon {
        font-size: 1.5rem;
        width: 40px;
    }

    .link-text {
        font-size: 1rem;
    }

    .milestone-logo {
        max-width: 60px;
        max-height: 60px;
        top: 1rem;
        right: 1rem;
    }

    .milestone-title {
        padding-right: 70px; /* Adjust for smaller logo on mobile */
    }
}

/* Language Toggle Styles */
.language-toggle {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.lang-btn {
    padding: 0.5rem 1rem;
    border: 2px solid var(--secondary-color);
    background: transparent;
    color: var(--text-color);
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    min-width: 50px;
}

.lang-btn:hover {
    background: var(--secondary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.lang-btn.active {
    background: var(--secondary-color);
    color: white;
}

@media (max-width: 768px) {
    .language-toggle {
        gap: 0.3rem;
        margin-bottom: 1rem;
    }

    .lang-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
        min-width: 45px;
    }
}