/* CSS Variables for theming */
:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --danger-color: #e74c3c;
    --background-color: #ffffff;
    --surface-color: #f8f9fa;
    --text-color: #2c3e50;
    --text-secondary: #7f8c8d;
    --border-color: #dee2e6;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --primary-color: #5dade2;
    --secondary-color: #58d68d;
    --danger-color: #ec7063;
    --background-color: #1a1a2e;
    --surface-color: #16213e;
    --text-color: #eaeaea;
    --text-secondary: #b0b0b0;
    --border-color: #2c3e50;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: var(--transition);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    background: var(--surface-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: var(--transition);
    z-index: 1000;
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-hover);
}

.theme-toggle svg {
    stroke: var(--text-color);
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.theme-toggle .moon-icon {
    display: none;
}

[data-theme="dark"] .theme-toggle .sun-icon {
    display: none;
}

[data-theme="dark"] .theme-toggle .moon-icon {
    display: block;
}

/* Header */
.header {
    background: var(--surface-color);
    box-shadow: var(--shadow);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-color);
}

.auth-section {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.user-info {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Buttons */
.btn {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    display: inline-block;
    transition: var(--transition);
}

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

.btn-primary:hover {
    background: #2980b9;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-secondary {
    background: var(--surface-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

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

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

.btn-danger:hover {
    background: #c0392b;
}

.btn-block {
    width: 100%;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 0 2rem;
    animation: fadeInDown 0.6s ease;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

/* Search */
.search-container {
    display: flex;
    gap: 1rem;
    max-width: 600px;
    margin: 2rem auto;
    animation: fadeIn 0.8s ease;
}

.search-input {
    flex: 1;
    padding: 0.8rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    background: var(--surface-color);
    color: var(--text-color);
    font-size: 1rem;
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Posts Grid */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.post-card {
    background: var(--surface-color);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
    animation: fadeInUp 0.6s ease;
}

.post-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.post-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.post-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

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

.post-stats {
    display: flex;
    gap: 1rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.draft-badge {
    display: inline-block;
    background: var(--danger-color);
    color: white;
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: bold;
}

/* Single Post */
.post-single {
    max-width: 800px;
    margin: 2rem auto;
    background: var(--surface-color);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
    animation: fadeIn 0.6s ease;
}

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

.post-single .post-meta {
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 1rem;
    margin-bottom: 2rem;
}

.post-content {
    line-height: 1.8;
    font-size: 1.1rem;
}

.post-content h1,
.post-content h2,
.post-content h3 {
    margin-top: 2rem;
    margin-bottom: 1rem;
}

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

.post-content img {
    max-width: 100%;
    border-radius: 8px;
    margin: 1rem 0;
}

.post-content code {
    background: var(--background-color);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
}

.post-content pre {
    background: var(--background-color);
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1rem 0;
}

/* Comments */
.comments-section {
    max-width: 800px;
    margin: 3rem auto;
    animation: fadeIn 0.8s ease;
}

.comments-section h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
}

.comment-form {
    margin-bottom: 2rem;
}

.comment-form textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--surface-color);
    color: var(--text-color);
    font-family: inherit;
    font-size: 1rem;
    resize: vertical;
    margin-bottom: 1rem;
}

.comment-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.login-prompt {
    background: var(--surface-color);
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    margin-bottom: 2rem;
}

.login-prompt a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: bold;
}

.comment {
    background: var(--surface-color);
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    animation: fadeIn 0.4s ease;
}

.comment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.comment-author {
    font-weight: bold;
    color: var(--primary-color);
}

.comment-date {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.comment-content {
    color: var(--text-color);
    line-height: 1.6;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin: 3rem 0;
}

.pagination button {
    padding: 0.6rem 1rem;
    border: 1px solid var(--border-color);
    background: var(--surface-color);
    color: var(--text-color);
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
}

.pagination button:hover:not(:disabled) {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.pagination button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination button.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    animation: fadeIn 0.3s ease;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: var(--surface-color);
    padding: 2rem;
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    position: relative;
    animation: slideUp 0.3s ease;
}

.close {
    position: absolute;
    right: 1rem;
    top: 1rem;
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.close:hover {
    color: var(--text-color);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    background: var(--background-color);
    color: var(--text-color);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.error-message {
    color: var(--danger-color);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    display: none;
}

.error-message.show {
    display: block;
}

/* Loading */
.loading {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
    font-size: 1.2rem;
}

/* Footer */
.footer {
    background: var(--surface-color);
    padding: 2rem 0;
    text-align: center;
    margin-top: 4rem;
    border-top: 1px solid var(--border-color);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

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

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Responsive */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 1rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .posts-grid {
        grid-template-columns: 1fr;
    }

    .post-single h1 {
        font-size: 2rem;
    }

    .theme-toggle {
        top: 10px;
        right: 10px;
        width: 40px;
        height: 40px;
    }
}