:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --secondary: #10b981;
  --accent: #f59e0b;
  --dark: #1f2937;
  --light: #f9fafb;
  --gray: #9ca3af;
  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --gradient-secondary: linear-gradient(135deg, #10b981 0%, #3b82f6 100%);
  --gradient-accent: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
  --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 20px 25px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 25px 50px rgba(0, 0, 0, 0.25);
  --radius: 12px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', 'Segoe UI', sans-serif;
    color: var(--dark);
    background: var(--light);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(99, 102, 141, 0.05) 0%, transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(16, 185, 129, 0.05) 0%, transparent 25%);
}

/* animation */

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes glow {
    0%, 100% { box-shadow: 0 0 20px rgba(99, 102, 241, 0.3);}
    50% { box-shadow: 0 0 30px rgba(99, 102, 241, 0.6); }
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translate3d(0, 60px, 0);
    }
    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }
}

@keyframes ripple-animation {
    0% {
        transform: scale(0);
        opacity: 0.5;
    }
    100% {
        transform: scale(2.5);
        opacity: 0;
    }
}



.blog-post.card,
.feature-card {
    opacity: 0;
    transform: translate3d(0, 60px, 0);
}

.fade-in-up {
    animation: fadeInUp 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

/* nawigation */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.navbar-brand {
    font-weight: 800;
    font-size: 1.8rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    position: relative;
}

.navbar-brand i {
    padding-right: 10px;
}

.navbar-brand::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 30px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
    transition: var(--transition);
}

.navbar-brand:hover::after {
    width: 100%;
}

.navbar-nav .nav-link {
    font-weight: 600;
    margin: 0 0.3rem;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.navbar-nav .nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    transition: var(--transition);
    z-index: -1;
    border-radius: 50px;
}

.navbar-nav .nav-link:hover::before {
    left: 0;
}

.navbar-nav .nav-link.active {
    background: var(--gradient-primary);
    color: white !important;
    box-shadow: var(--shadow-md);
}

.navbar-nav .nav-link:hover {
    color: white !important;
    transform: translateY(-2px);
}

/* Hero section */

.hero {
    min-height: 60vh;
    display: flex;
    align-items: center;
    background: var(--gradient-primary);
    color: white;
    position: relative;
    overflow: hidden;
    margin-bottom: 4rem;
    justify-content: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 20%), 
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 20%);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 4rem 2rem;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    animation: slideIn 1s ease-out;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    animation: slideIn 1s ease-out 0.2s both;
}

/* footer */

footer {
    background: var(--dark);
    color: white;
    padding: 4rem 0 2rem;
    margin-top: 6rem;
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: var(--gradient-primary);
}

.footer-links a {
    color: var(--gray);
    text-decoration: none;
    transition: var(--transition);
    display: block;
    margin-bottom: 0.5rem;
}

.footer-links a:hover {
    color: white;
    transform: translateX(5px);
}

.social-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

.social-links a {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(225, 255, 255, 0.1);
    color: white;
    font-size: 1.2rem;
    transition: var(--transition);
    text-decoration: none;
}

.social-links a:hover {
    background: var(--gradient-primary);
    transform: translateY(-3px);
}

/* features */
.feature-icon {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    font-size: 1.8rem;
    margin: 0 auto 1.5rem;
    animation: float 3s ease-in-out infinite;
}

.feature-card {
    text-align: center;
    padding: 2rem;
    border-radius: var(--radius);
    background: white;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    height: 100%;
}

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



/* buttons */

.btn {
    border-radius: 50px;
    padding: 0.8rem 2rem;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    position: relative;
    overflow: hidden;
}

.btn .ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.6);
    width: 20px;
    height: 20px;
    margin-top: -10px;
    margin-left: -10px;
    animation: ripple-animation 0.6s ease-out;
    pointer-events: none;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--gradient-primary);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    animation: glow 2s infinite;
}

.btn-outline-primary {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

.btn-outline-primary:hover {
    background: var(--gradient-primary);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.btn-gradient {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-gradient:hover {
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
    animation: glow 2s infinite;
}

/* auth buttons */
.auth-btn {
    width: 100%;
    background: var(--gradient-primary);
    border: none;
    border-radius: 12px;
    padding: 15px 20px;
    color: white;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    position: relative;
    overflow: hidden;
    text-decoration: none;
}

.auth-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.auth-btn:hover::before {
    left: 100%;
}

.auth-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

.auth-btn:active {
    transform: translateY(0);
}

.auth-btn i {
    font-size: 1.2rem;
}

.auth-btn-outline {
    background: transparent;
    border: 2px solid #667eea;
    color: #667eea;
}

.auth-btn-outline:hover {
    background: #667eea;
    color: white;
}

.auth-btn-sm {
    padding: 10px 15px;
    font-size: 1rem;
}

.auth-btn-lg {
    padding: 20px 25px;
    font-size: 1.2rem;
}

.auth-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    animation: none !important;
}

.auth-btn:disabled:hover {
    box-shadow: none;
}

/* forms */
.form-control {
    border-radius: var(--radius);
    padding: 1rem 1.5rem;
    border: 2px solid #e5e7eb;
    transition: var(--transition);
    font-size: 1rem;
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    transform: translateY(-2px);
}

.card-body {
    padding: 2rem;
}

.card {
    border-radius: 10px;
}

/* Sidebar */
.sidebar-card {
    border: none;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    background: linear-gradient(145deg, #ffffff, #f8f9fa);
    position: relative;
    margin-bottom: 1.5rem;
}

.sidebar-card:last-child {
    margin-bottom: 0;
}

.sidebar-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.sidebar-card:hover::before {
    opacity: 1;
}

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

.sidebar-card .card-body {
    padding: 1.8rem;
    position: relative;
    z-index: 2;
}

.sidebar-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 1.2rem;
    display: flex;
    align-items: center;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    transition: var(--transition);
}

.sidebar-card:hover .sidebar-title {
    transform: translateX(5px);
}

.sidebar-title i {
    font-size: 1.2rem;
    margin-right: 0.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.sidebar-text {
    color: #718096;
    line-height: 1.6;
    font-size: 1rem;
    margin-bottom: 0;
    transition: color 0.3s ease;
}

.sidebar-card:hover .sidebar-text {
    color: #4a5568;
}

/* Tags */

.tags-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem
}

.tag-badge {
    background: linear-gradient(135deg, #f7fafc 0%, #edf2f7 100%);
    color: #4a5568 !important;
    padding: 0.6rem 1rem;
    border-radius: 25px;
    font-weight: 500;
    font-size: 0.9rem;
    border: 2px solid transparent;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.tag-badge::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.1), transparent);
    transition: left 0.6s ease;
}

.tag-badge:hover::before {
    left: 100%;
}

.tag-badge:hover {
    background: var(--gradient-primary);
    color: white !important;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Badges */

.post-count-badge {
    background: var(--gradient-primary);
    color: white !important;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-weight: 600;
    font-size: 0.9rem;
    border: none;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.post-count-badge::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.6s ease;
}

.post-count-badge:hover::before {
    left: 100%;
}

.post-count-badge:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.post-count-badge i {
    margin-right: 0.3rem;
    font-size: 0.8rem;
}

.post-count-badge.sm {
    padding: 0.3rem 0.7rem;
    font-size: 0.8rem;
}

.post-count-badge.lg {
    padding: 0.7rem 1.3rem;
    font-size: 1rem;
}

/* Post Header */

.blog-post-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid #e2e8f0;
}

.blog-post-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: #2d3748;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.blog-post-meta {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    color: #718096;
    font-size: 0.9rem;
}

.blog-post-meta span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.blog-post-actions {
    display: flex;
    gap: 1rem;
}

/* Post Content */

.blog-post-content {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #2d3748;
    margin-top: 1.5rem;
}

.blog-post-content p {
    margin-bottom: 1.5rem;
}

.blog-post-content h2,
.blog-post-content h3,
.blog-post-content h4 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-weight: 700;
  color: #2d3748;
}
 
.blog-post-content h2 {
  font-size: 1.8rem;
  border-bottom: 2px solid #e2e8f0;
  padding-bottom: 0.5rem;
}
 
.blog-post-content h3 {
  font-size: 1.5rem;
}
 
.blog-post-content h4 {
  font-size: 1.3rem;
}
 
.blog-post-content ul,
.blog-post-content ol {
  margin-bottom: 1.5rem;
  padding-left: 2rem;
}
 
.blog-post-content li {
  margin-bottom: 0.5rem;
}
 
.blog-post-content blockquote {
  border-left: 4px solid var(--primary);
  padding-left: 1.5rem;
  margin-left: 0;
  font-style: italic;
  color: #718096;
  background: #f7fafc;
  padding: 1.5rem;
  border-radius: 8px;
  margin: 1.5rem 0;
}
 
.blog-post-content code {
  background: #f7fafc;
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.9em;
  color: #e53e3e;
}
 
.blog-post-content pre {
  background: #1a202c;
  color: #e2e8f0;
  padding: 1.5rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1.5rem 0;
}
 
.blog-post-content pre code {
  background: none;
  color: inherit;
  padding: 0;
}
 
.blog-post-content img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  margin: 1.5rem 0;
  box-shadow: var(--shadow-md);
}
 
.blog-post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}
 
.blog-post-content table th,
.blog-post-content table td {
  padding: 0.75rem;
  border: 1px solid #e2e8f0;
  text-align: left;
}
 
.blog-post-content table th {
  background: #f7fafc;
  font-weight: 600;
}
 
.blog-post-content table tr:nth-child(even) {
  background: #f7fafc;
}
 
.blog-post-content a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.3s ease;
}
 
.blog-post-content a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

/* Comments */

.comments-section {
    margin-top: 3rem;
    padding-top: 2rem;
    border-bottom: 2px solid #e2e8f0;
}

.comment {
    border: none;
    border-top-right-radius: 12px !important;
    border-bottom-right-radius: 12px !important;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    background: white;
    margin-bottom: 1.5rem;
    position: relative;
}

.comment::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient-primary);
}

.comment:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

.comment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.comment-text {
    color: #4a5568;
    line-height: 1.6;
}

.add-comment {
    background-color: #f7fafc;
    padding: 2rem;
    border-radius: var(--radius);
    margin-top: 2rem;
}

/* special effects */
.particle-network {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: -1;
}

.parallax-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(16, 185, 129, 0.1) 0%, transparent 25%);
    z-index: -2;
}

/* utilities */
.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: inline-block;
}

.gradient-bg {
    background: var(--gradient-primary);
    background-size: 200% 200%;
    animation: gradientShift 3s ease infinite;
}

.shadow-hover {
    transition: var(--transition);
}

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

.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }
.animate-delay-1 { animation-delay: 0.4s; }
.animate-delay-1 { animation-delay: 0.5s; }

/* Responsive Design */

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .navbar-nav .nav-link {
        margin: 0.2rem 0;
        text-align: center;
    }

    .blog-post-content {
        font-size: 1rem;
    }

    .blog-post-content h2 {
        font-size: 1.5rem;
    }

    .blog-post-content h3 {
        font-size: 1.3rem;
    }

    .blog-post-content pre {
        padding: 1rem;
    }

    .blog-post-content table {
        font-size: 0.9rem;
    }

    .blog-post-title {
        font-size: 2rem;
    }

    .blog-post-meta {
        flex-direction: column;
        gap: 0.5rem;
    }

    .add-comment {
        padding: 1.5rem;
    }

    .tags-container {
        justify-content: center;
    }

    .tag-badge {
        padding: 0.5rem 0.8rem;
        font-size: 0.85rem;
    }

    .auth-btn {
        padding: 12px 16px;
        font-size: 1rem;
    }

    .auth-btn-lg {
        padding: 16px 20px;
        font-size: 1.1rem;
    }

    .post-count-badge {
        padding: 0.4rem 0.8rem;
        font-size: 0.85rem;
    }

    .post-count-badge.lg {
        padding: 0.6rem 1.1rem;
    }
}

@media (max-width: 992px) {
    .sidebar-card {
        margin-bottom: 1.5rem;
    }

    .sidebar-card .card-body {
        padding: 1.5rem;
    }

    .sidebar-title {
        font-size: 1.2rem;
    }
}