/* ----------------------------------
    PROJECTS PAGE STYLES
-------------------------------------*/
.projects-section {
    padding: 12rem 9% 4rem;
    background: #f9fafb;
}

.projects-header {
    text-align: center;
    margin-bottom: 4rem;
}

.projects-header .heading {
    font-size: 4.5rem;
}

.projects-header p {
    font-size: 1.8rem;
    color: #666;
    max-width: 600px;
    margin: 1rem auto 0;
}

/* Filter Buttons */
.projects-filter {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 5rem;
}

.filter-btn {
    padding: 0.7rem 1.8rem;
    margin: 0 0.5rem 1rem 0;
    border: 1px solid #e0e0e0;
    border-radius: 5rem; /* Pill shape */
    background: #f9f9f9;
    color: #555;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-btn:hover {
    background: #f0f0f0;
    border-color: #d0d0d0;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.filter-btn.active {
    background: #6c63ff; /* Default for "All Projects" */
    color: white;
    border-color: #6c63ff;
    box-shadow: 0 5px 15px rgba(108, 99, 255, 0.2);
}

/* Category-specific active filter colors */
.filter-btn[data-filter=".supervised-learning"].active {
    background: linear-gradient(135deg, #d9534f, #ff8a65);
    border-color: transparent;
    box-shadow: 0 5px 15px rgba(217, 83, 79, 0.3);
}

.filter-btn[data-filter=".unsupervised-learning"].active {
    background: linear-gradient(135deg, #3fa39a, #48c6b9);
    border-color: transparent;
    box-shadow: 0 5px 15px rgba(63, 163, 154, 0.3);
}

.filter-btn[data-filter=".large-language-models"].active {
    background: linear-gradient(135deg, #f0ad4e, #fec867);
    border-color: transparent;
    box-shadow: 0 5px 15px rgba(240, 173, 78, 0.3);
}

/* Projects Gallery */
.projects-gallery {
    position: relative;
    margin-top: 3rem;
}

/* Define grid structure for Isotope */
.grid-sizer,
.project-box {
    width: 31.5%;
}

.gutter-sizer {
    width: 2.75%;
}

/* --- Project Card --- */
.project-box {
    border-radius: 1.2rem;
    padding: 4px; /* Creates the border thickness */
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    margin-bottom: 2.5rem;
    display: block;
    text-decoration: none;
    cursor: pointer;
}

/* Category-specific borders */
.project-box.supervised-learning { background: linear-gradient(135deg, #d9534f, #ff8a65); }
.project-box.unsupervised-learning { background: linear-gradient(135deg, #3fa39a, #48c6b9); }
.project-box.large-language-models { background: linear-gradient(135deg, #f0ad4e, #fec867); }

.project-box:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.12);
}

.project-box:focus-visible {
    outline: 3px solid #6c63ff;
    outline-offset: 4px;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.12);
}

.project-content {
    background: #fff;
    padding: 2.5rem 2rem 2rem; /* Adjusted padding for structure */
    border-radius: 0.9rem; /* Slightly smaller radius to show the border */
    height: 100%;
    display: flex;
    flex-direction: column;
}

.project-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #3d3d5e;
    margin-bottom: 0.75rem;
}

.project-description {
    color: #7a7a7a;
    line-height: 1.6;
    margin-bottom: 1.5rem;
    flex-grow: 1; /* Pushes tags to the bottom */
    
    /* Truncate to 2 lines */
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    min-height: 3.2em; /* Ensures space for 2 lines, preventing footer jump */
}

.project-footer {
    margin-top: auto;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.tech-tag {
    padding: 0.5rem 1rem;
    border-radius: 5rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: white;
}

.cta-view {
    display: block;
    text-align: right;
    font-weight: 700;
    color: #6c63ff;
    margin-top: 1.5rem;
    transition: all 0.2s ease-in-out;
}

.project-box:hover .cta-view {
    color: #5048e0;
    transform: translateX(4px);
}

/* Category-specific colors */
.supervised-learning .project-title { color: #d9534f; }
.unsupervised-learning .project-title { color: #3fa39a; }
.large-language-models .project-title { color: #f0ad4e; }

/* Improved Contrast Tags */
.supervised-learning .tech-tag { background: #d9534f; }
.unsupervised-learning .tech-tag { background: #3fa39a; }
.large-language-models .tech-tag { background: #f0ad4e; }
.tech-tag { background: #6c63ff; } /* Default for non-categorized or "All" */

/* --- Isotope Transitions --- */
.project-box {
  transition: .5s ease-out;
  transition-property: transform, opacity, box-shadow;
}

.project-box.isotope-hidden {
  opacity: 0;
  transform: scale(0.8);
}

/* --- Responsive Design --- */
@media (max-width: 992px) {
    .grid-sizer, .project-box { width: 48%; }
    .gutter-sizer { width: 4%; }
}

/* Colorful Page Title */
.page-title {
    font-size: 2.8rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 0.5rem;
    color: #3d3d5e; /* Dark, muted purple */
}

.page-subtitle {
    text-align: center;
    color: #7a7a7a;
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

/* Colorful Section Headers */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
}

/* --- Filter Buttons --- */
.filter-btn {
    padding: 0.7rem 1.8rem;
    margin: 0 0.5rem 1rem 0;
    border: 1px solid #e0e0e0;
    border-radius: 5rem; /* Pill shape */
    background: #f9f9f9;
    color: #555;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-btn:hover {
    background: #f0f0f0;
    border-color: #d0d0d0;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.filter-btn.active {
    background: #6c63ff; /* Default for "All Projects" */
    color: white;
    border-color: #6c63ff;
    box-shadow: 0 5px 15px rgba(108, 99, 255, 0.2);
}

/* Category-specific active filter colors */
.filter-btn[data-filter=".supervised-learning"].active {
    background: linear-gradient(135deg, #d9534f, #ff8a65);
    border-color: transparent;
    box-shadow: 0 5px 15px rgba(217, 83, 79, 0.3);
}

.filter-btn[data-filter=".unsupervised-learning"].active {
    background: linear-gradient(135deg, #3fa39a, #48c6b9);
    border-color: transparent;
    box-shadow: 0 5px 15px rgba(63, 163, 154, 0.3);
}

.filter-btn[data-filter=".large-language-models"].active {
    background: linear-gradient(135deg, #f0ad4e, #fec867);
    border-color: transparent;
    box-shadow: 0 5px 15px rgba(240, 173, 78, 0.3);
}