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

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --bg-color: #ecf0f1;
    --text-color: #34495e;
    --card-bg: #ffffff;
    --border-color: #bdc3c7;
    --hover-bg: #f8f9fa;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    padding: 20px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    background: var(--card-bg);
    padding: 40px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
}

header {
    text-align: center;
    padding-bottom: 30px;
    border-bottom: 3px solid var(--secondary-color);
    margin-bottom: 40px;
}

header h1 {
    color: var(--primary-color);
    font-size: 2.5em;
    margin-bottom: 10px;
}

.tagline {
    color: var(--secondary-color);
    font-size: 1.2em;
    font-weight: 400;
}

section {
    margin-bottom: 40px;
}

section h2 {
    color: var(--primary-color);
    font-size: 1.8em;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border-color);
}

section p,
section ul {
    font-size: 1.05em;
    line-height: 1.8;
}

section ul {
    margin-left: 20px;
    margin-top: 15px;
}

section ul li {
    margin-bottom: 10px;
}

.quick-links .links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.link-card {
    display: block;
    padding: 25px;
    background: var(--bg-color);
    border-radius: 6px;
    border-left: 4px solid var(--secondary-color);
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

.link-card:hover {
    background: var(--hover-bg);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.link-card h3 {
    color: var(--primary-color);
    font-size: 1.3em;
    margin-bottom: 8px;
}

.link-card p {
    color: var(--text-color);
    font-size: 0.95em;
    line-height: 1.5;
}

.about p {
    text-align: justify;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.project-card {
    padding: 20px;
    background: var(--bg-color);
    border-radius: 6px;
    border-left: 4px solid var(--accent-color);
}

.project-card h3 {
    color: var(--primary-color);
    font-size: 1.2em;
    margin-bottom: 10px;
}

.project-card p {
    font-size: 1em;
    line-height: 1.6;
}

.demo-link,
.cv-link {
    margin-top: 15px;
    font-style: italic;
    color: #7f8c8d;
}

.demo-link a,
.cv-link a {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 600;
}

.demo-link a:hover,
.cv-link a:hover {
    text-decoration: underline;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 15px;
    margin-top: 20px;
}

.skill-category {
    padding: 15px;
    background: var(--bg-color);
    border-radius: 6px;
    border-left: 4px solid var(--secondary-color);
}

.skill-category h4 {
    color: var(--primary-color);
    margin-bottom: 12px;
    font-size: 1.1em;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tag {
    background: var(--secondary-color);
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.9em;
}

.experience ul {
    margin-top: 15px;
}

.cta {
    text-align: center;
    padding: 30px 20px;
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.1), rgba(44, 62, 80, 0.1));
    border-radius: 8px;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 25px;
}

.cta-button {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1em;
    transition: all 0.3s ease;
    border: 2px solid var(--secondary-color);
    color: var(--secondary-color);
    background: white;
}

.cta-button.primary {
    background: var(--secondary-color);
    color: white;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.cta-button.primary:hover {
    background: #2980b9;
    border-color: #2980b9;
}

footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 2px solid var(--border-color);
    color: #7f8c8d;
    font-size: 0.9em;
}

.update-date {
    margin-top: 5px;
    font-size: 0.85em;
}

/* Breadcrumb Navigation */
.breadcrumb {
    margin-top: 15px;
    font-size: 0.9em;
    color: #7f8c8d;
}

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

.breadcrumb a:hover {
    text-decoration: underline;
}

/* Demos Page Styles */
.demos-intro {
    font-size: 1.05em;
    line-height: 1.8;
    color: var(--text-color);
    background: var(--bg-color);
    padding: 20px;
    border-radius: 6px;
    margin-bottom: 40px;
    border-left: 4px solid var(--secondary-color);
}

.demo-detailed {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.demo-item {
    background: var(--bg-color);
    padding: 30px;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

.demo-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
}

.demo-header h2 {
    color: var(--primary-color);
    font-size: 1.8em;
    margin: 0;
    border: none;
    padding: 0;
}

.demo-meta {
    display: flex;
    gap: 10px;
    align-items: center;
}

.demo-status {
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.85em;
    font-weight: 600;
}

.demo-status.active {
    background: rgba(46, 204, 113, 0.15);
    color: #2d7a3a;
    border: 1px solid rgba(46, 204, 113, 0.3);
}

.demo-year {
    color: #7f8c8d;
    font-size: 0.9em;
    font-style: italic;
}

.demo-description {
    margin-bottom: 25px;
}

.demo-description > p {
    font-size: 1.05em;
    line-height: 1.8;
    margin-bottom: 20px;
}

.demo-description h3 {
    color: var(--primary-color);
    font-size: 1.3em;
    margin-top: 25px;
    margin-bottom: 12px;
}

.demo-description ul {
    margin-left: 20px;
    margin-top: 10px;
}

.demo-description ul li {
    margin-bottom: 10px;
    line-height: 1.7;
}

.demo-description ul li strong {
    color: var(--primary-color);
}

.tech-stack {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-top: 15px;
}

.tech-group {
    background: white;
    padding: 15px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.tech-group h4 {
    color: var(--primary-color);
    font-size: 1em;
    margin-bottom: 10px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--bg-color);
}

.tech-group .tech-tag {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: 4px 10px;
    border-radius: 15px;
    font-size: 0.85em;
    margin: 4px 4px 4px 0;
}

.demo-links {
    display: flex;
    gap: 15px;
    margin-top: 25px;
    flex-wrap: wrap;
}

.demo-link-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1em;
    transition: all 0.3s ease;
    border: 2px solid var(--secondary-color);
    color: var(--secondary-color);
    background: white;
}

.demo-link-btn.primary {
    background: var(--secondary-color);
    color: white;
}

.demo-link-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.demo-link-btn.primary:hover {
    background: #2980b9;
    border-color: #2980b9;
}

.demo-link-btn .icon {
    font-size: 1.1em;
}

@media (max-width: 768px) {
    .container {
        padding: 20px;
    }

    header h1 {
        font-size: 2em;
    }

    .tagline {
        font-size: 1em;
    }

    section h2 {
        font-size: 1.5em;
    }

    .links-grid,
    .project-grid,
    .skills-grid {
        grid-template-columns: 1fr;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: stretch;
    }

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

    .demo-item {
        padding: 20px;
    }

    .demo-header {
        flex-direction: column;
        gap: 10px;
    }

    .demo-meta {
        align-self: flex-start;
    }

    .tech-stack {
        grid-template-columns: 1fr;
    }

    .demo-links {
        flex-direction: column;
    }

    .demo-link-btn {
        width: 100%;
        justify-content: center;
    }
}