/* Hero Section */
.hero {
    height: 50vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: radial-gradient(ellipse at center, rgba(78, 205, 196, 0.1) 0%, transparent 70%);
}

.hero-content {
    text-align: center;
    max-width: 800px;
    padding: 0 2rem;
    animation: fadeInUp 1s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero h1 {
    font-size: 4rem;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, #ff6b6b, #4ecdc4, #45b7d1, #f7d794);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: rainbow 3s infinite;
}

@keyframes rainbow {
    0% {
        filter: hue-rotate(0deg);
    }

    100% {
        filter: hue-rotate(360deg);
    }
}

.hero p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Filter Section */
.filter-section {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
}

.filter-bar {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    justify-content: center;
}

.filter-btn {
    font-size: 0.8rem;
    padding: 0rem 0.4rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #ffffff;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
    width: 11%;
}

.filter-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: radial-gradient(circle, rgba(135, 206, 250, 0.3) 0%, transparent 70%);
    transition: all 0.3s ease;
    transform: translate(-50%, -50%);
}

.filter-btn:hover::before {
    width: 200px;
    height: 200px;
}

.filter-btn:hover,
.filter-btn.active {
    background: #154C6C;
    border-color: #1483B9;
    transform: translateY(-3px);
}

/* Search Bar */
.search-container {
    position: relative;
    max-width: 500px;
    margin: 2rem auto;
}

.search-input {
    width: 100%;
    padding: 1rem 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 25px;
    color: #ffffff;
    font-size: 1rem;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.search-input:focus {
    outline: none;
    border-color: #1b7dce;
    box-shadow: 0 0 20px rgba(10, 111, 157, 0.3);
    transform: scale(1.02);
}

.search-input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

/* Blog Grid */
.blog-grid {
    max-width: 1600px;
    margin: 0 auto;
    padding: 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.blog-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    overflow: hidden;
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.4s ease;
    position: relative;
    cursor: pointer;
}

.blog-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.6s;
}

.blog-card:hover::before {
    left: 100%;
}

.blog-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    border-color: rgba(13, 147, 236, 0.5);
}

.blog-list-img {
    width: 100%;
    height: 100%;
    object-fit: cover; /* hoặc contain */
    display: block;

}

.card-image {
    height: 200px;
    position: relative;
    overflow: hidden;
}

.card-content {
    padding: 1.5rem;
}

.card-category {
    display: inline-block;
    padding: 0.1rem 0.4rem;
    background-color: rgba(0, 158, 226, 0.5);
    color: #d2e2e8;
    border-radius: 15px;
    font-size: 0.6rem;
    margin-bottom: 1rem;
    margin-left: 3px;
}

.card-title {
    font-size: 1.3rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
    line-height: 1.4;
    transition: color 0.3s ease;
}

.blog-card:hover .card-title {
    color: #f39c12;
}

.card-excerpt {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.8rem;
}

.read-more {
    color: #3cb9e7;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
    position: relative;
}

.read-more::after {
    content: '→';
    margin-left: 0.5rem;
    transition: transform 0.3s ease;
}

.read-more:hover::after {
    transform: translateX(5px);
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 3rem 0;
    flex-wrap: wrap;
}

.page-btn {
    padding: 0.4rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #ffffff;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 5%;
    backdrop-filter: blur(10px);
}

.page-btn:hover,
.page-btn.active {
    background: rgba(231, 76, 60, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(231, 76, 60, 0.3);
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .nav-links {
        display: none;
    }

    .blog-grid {
        grid-template-columns: 1fr;
        padding: 1rem;
    }

    .filter-bar {
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: 1rem;
    }
}

/* Loading Animation */
.loading {
    display: none;
    text-align: center;
    padding: 2rem;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top: 3px solid #e74c3c;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}


.floating-shapes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}

.shape {
    position: absolute;
    opacity: 0.1;
    animation: float 6s ease-in-out infinite;
}

.shape:nth-child(1) {
    top: 10%;
    left: 10%;
    width: 100px;
    height: 100px;
    background: #ff6b6b;
    border-radius: 50%;
    animation-delay: 0s;
}

.shape:nth-child(2) {
    top: 60%;
    right: 10%;
    width: 80px;
    height: 80px;
    background: #4ecdc4;
    border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
    animation-delay: 2s;
}

.shape:nth-child(3) {
    bottom: 20%;
    left: 20%;
    width: 60px;
    height: 60px;
    background: #45b7d1;
    border-radius: 20%;
    animation-delay: 4s;
}


.shape:nth-child(4) {
    bottom: 60%;
    left: 30%;
    width: 60px;
    height: 60px;
    background: #154C6C;
    border-radius: 30% 30% 70% 70%;
    animation-delay: 4s;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px) rotate(0deg);
    }

    50% {
        transform: translateY(-20px) rotate(180deg);
    }
}


.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: rgba(255, 255, 255, 0.6);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.3;
}