:root {
    --bg-gradient-start: #0f0c29;
    --bg-gradient-mid: #302b63;
    --bg-gradient-end: #24243e;
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.9);
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --accent-start: #667eea;
    --accent-end: #764ba2;
    --shadow-color: rgba(0, 0, 0, 0.2);
}

[data-theme="light"] {
    --bg-gradient-start: #f5f7fa;
    --bg-gradient-mid: #c3cfe2;
    --bg-gradient-end: #e0e7ef;
    --text-primary: #1a1a2e;
    --text-secondary: #16213e;
    --card-bg: rgba(255, 255, 255, 0.8);
    --card-border: rgba(0, 0, 0, 0.1);
    --accent-start: #667eea;
    --accent-end: #764ba2;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-mid) 50%, var(--bg-gradient-end) 100%);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
    transition: background 0.5s ease, color 0.3s ease;
}

.site-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 2rem 0;
}

.container {
    max-width: 900px;
    width: 90%;
    margin: 0 auto;
    padding: 2rem;
    flex: 1;
}

/* Header */
.site-header {
    width: 100%;
    max-width: 900px;
    margin: 0 auto 3rem;
    padding: 0 1rem;
    text-align: center;
    animation: fadeIn 1s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.logo {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    font-weight: 700;
    box-shadow: 0 10px 40px rgba(102, 126, 234, 0.4);
    animation: float 3s ease-in-out infinite;
    text-decoration: none;
    color: white;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-10px) rotate(2deg); }
}

.site-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -1px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-start) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.site-title a {
    text-decoration: none;
    color: inherit;
}

.site-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.nav-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 1.5rem;
}

.nav-links a {
    padding: 0.6rem 1.2rem;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 2px solid var(--card-border);
    border-radius: 30px;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.nav-links a:hover {
    background: var(--accent-start);
    border-color: var(--accent-end);
    transform: translateY(-2px);
    box-shadow: 0 5px 20px var(--shadow-color);
}

/* Theme & Language toggles */
.theme-toggle, .lang-toggle {
    position: fixed;
    top: 2rem;
    width: 50px;
    height: 50px;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 2px solid var(--card-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.5rem;
    transition: all 0.3s ease;
    z-index: 1000;
    box-shadow: 0 4px 15px var(--shadow-color);
}

.theme-toggle {
    right: 2rem;
}

.lang-toggle {
    right: 6rem;
    font-size: 0.85rem;
    font-weight: 700;
}

.theme-toggle:hover, .lang-toggle:hover {
    transform: scale(1.1) rotate(15deg);
    background: var(--accent-start);
    border-color: var(--accent-end);
}

[lang]:not([lang="es"]) .es,
[lang]:not([lang="en"]) .en {
    display: none;
}

/* Blog posts list */
.posts-list {
    display: grid;
    gap: 2rem;
    margin-top: 2rem;
}

.post-card {
    background: var(--card-bg);
    backdrop-filter: blur(15px);
    border-radius: 20px;
    border: 1px solid var(--card-border);
    padding: 2rem;
    transition: all 0.3s ease;
    box-shadow: 0 8px 32px var(--shadow-color);
}

.post-card:hover {
    transform: translateY(-5px);
    background: rgba(102, 126, 234, 0.1);
    border-color: rgba(102, 126, 234, 0.3);
    box-shadow: 0 12px 40px rgba(102, 126, 234, 0.3);
}

.post-title {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.post-title a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.post-title a:hover {
    background: linear-gradient(135deg, var(--accent-start) 0%, var(--accent-end) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.post-meta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.post-meta span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.post-summary {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.read-more {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--card-bg);
    border: 2px solid var(--card-border);
    border-radius: 20px;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.read-more:hover {
    background: var(--accent-start);
    border-color: var(--accent-end);
    transform: translateX(5px);
}

/* Single post */
.post-content {
    background: var(--card-bg);
    backdrop-filter: blur(15px);
    border-radius: 20px;
    border: 1px solid var(--card-border);
    padding: 3rem;
    box-shadow: 0 8px 32px var(--shadow-color);
    margin-bottom: 2rem;
}

.post-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 2px solid var(--card-border);
}

.post-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.content {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.content h2 {
    font-size: 2rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.content h3 {
    font-size: 1.5rem;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.content p {
    margin-bottom: 1rem;
}

.content ul, .content ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.content li {
    margin-bottom: 0.5rem;
}

.content a {
    color: var(--accent-start);
    text-decoration: none;
    border-bottom: 2px solid transparent;
    transition: border-color 0.3s ease;
}

.content a:hover {
    border-bottom-color: var(--accent-start);
}

.content code {
    background: rgba(0, 0, 0, 0.3);
    padding: 0.2rem 0.5rem;
    border-radius: 5px;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.9em;
}

.content pre {
    background: rgba(0, 0, 0, 0.3);
    padding: 1.5rem;
    border-radius: 10px;
    overflow-x: auto;
    margin: 1.5rem 0;
    border-left: 4px solid var(--accent-start);
}

.content pre code {
    background: none;
    padding: 0;
}

.content blockquote {
    border-left: 4px solid var(--accent-start);
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    font-style: italic;
    color: var(--text-secondary);
}

.content img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    margin: 1.5rem 0;
}

/* Tags */
.tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.tag {
    padding: 0.3rem 0.8rem;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 15px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    transition: all 0.3s ease;
}

.tag:hover {
    background: var(--accent-start);
    border-color: var(--accent-end);
    color: white;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 3rem;
}

.pagination a, .pagination span {
    padding: 0.75rem 1.5rem;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 2px solid var(--card-border);
    border-radius: 30px;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.pagination a:hover {
    background: var(--accent-start);
    border-color: var(--accent-end);
    transform: translateY(-2px);
}

.pagination .active {
    background: var(--accent-start);
    border-color: var(--accent-end);
}

/* Footer */
.site-footer {
    width: 100%;
    max-width: 900px;
    margin: 4rem auto 0;
    padding: 2rem 1rem 1rem;
    text-align: center;
    border-top: 1px solid var(--card-border);
    color: var(--text-secondary);
    font-size: 0.75rem;
    opacity: 0.5;
    clear: both;
}

.privacy-notice {
    margin-top: 0.5rem;
}

/* Particles background */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}

.particle {
    position: absolute;
    background: var(--card-border);
    border-radius: 50%;
    animation: rise 15s infinite ease-in;
}

@keyframes rise {
    from {
        transform: translateY(100vh) scale(0);
        opacity: 1;
    }
    to {
        transform: translateY(-100vh) scale(1);
        opacity: 0;
    }
}

/* Responsive */
@media (max-width: 768px) {
    .site-title {
        font-size: 2rem;
    }
    
    .post-content {
        padding: 1.5rem;
    }
    
    .post-header h1 {
        font-size: 1.8rem;
    }
    
    .content {
        font-size: 1rem;
    }
    
    .content h2 {
        font-size: 1.5rem;
    }
}