/* ========== ABOUT PAGE ========== */
#left-hero img { height: 85px; width: 85px; }
.technologies { font-size: 20px; }
.technologies h2 { margin-top: 2%; }
.work-hero-img { height: 70%; width: 65%; object-fit: cover; }
#my_skills { margin-top: -5%; }
.info-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: flex-start;
    margin-top: 20px;
}
.responsibilities-container { display: flex; border-radius: 20px; background: #f5f5f5; }
.responsibilities-container .column { flex: 1; }
.responsibilities-container .item { margin-bottom: 5px; line-height: 1.6; font-size: 16px; }

/* ========== SECTIONS ========== */
.section {
    margin: 3rem auto;
    margin-left: -1%;
    margin-top: 3.5%;
    padding: 0 1.5rem;
    max-width: 1400px;
}
.section-title {
    font-size: 25px;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: rgb(0, 0, 109);
    border-left: 5px solid #0d6efd;
    padding-left: 0.5rem;
}
.section-description {
    font-size: 1.1rem;
    color: #555;
    margin-bottom: 2rem;
    padding-left: 1rem;
}

/* ========== CARDS GRID ========== */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin-top: 1rem;
}
.card {
    background: #ffffff;
    border-radius: 28px;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.200);
    width: 350px;
    max-width: 350px;
    min-width: 350px;
    transition: transform 0.2s, box-shadow 0.2s, visibility 0s, opacity 0.2s;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 400px;
}
.card:hover { transform: translateY(-5px); box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12); }
.card-img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    background: #f0f4fa;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
}
.card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: 70% 10%;
    transition: transform 0.5s ease;
}
.card:hover .card-img img { transform: scale(1.02); }
.card-content { padding: 1.5rem; }
.card-title {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: black;
}
.card-short-desc {
    font-size: 0.95rem;
    color: #404040;
    line-height: 1.4;
    margin-bottom: 1rem;
    font-weight: 500;
}
.view-btn {
    background: rgb(0, 0, 109);
    color: white;
    border: none;
    padding: 0.5rem 1.2rem;
    border-radius: 40px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}
.view-btn:hover { background: #1e38a8; }

/* Hidden state */
.card.hidden { visibility: hidden; opacity: 0; pointer-events: none; }
.card.hidden .card-img, .card.hidden .card-content { visibility: hidden; }
.section.hidden-section { display: none; }

/* ========== MODAL ========== */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    justify-content: center;
    align-items: center;
}
.modal-content {
    background-color: #fefefe;
    border-radius: 32px;
    width: 100%;
    max-width: 60%;
    max-height: 85vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 20px 35px rgba(0, 0, 0, 0.2);
    animation: fadeInUp 0.3s ease;
    margin: 0;
}
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 1.8rem;
    border-bottom: 1px solid #eef2f8;
    background: #fff;
    position: sticky;
    top: 0;
    z-index: 10;
    border-radius: 32px 32px 0 0;
}
.modal-header h2 { margin: 0; font-size: 1.8rem; font-weight: bold; color: black; }
.close-modal {
    font-size: 2rem;
    font-weight: 300;
    cursor: pointer;
    background: none;
    border: none;
    line-height: 1;
    color: #5e7e9e;
    transition: color 0.2s;
}
.close-modal:hover { color: #c00; }
.modal-body { padding: 1.8rem; }
.modal-detail-row { display: flex; flex-wrap: wrap; gap: 3rem; align-items: stretch; }
.modal-detail-row > div:first-child { display: flex; align-items: stretch; }
.modal-detail-row .work-hero-img {
    width: 100% !important;
    height: 100% !important;
    object-fit: cover;
    border-radius: 24px;
}
.tech-stack {
    display: inline-block;
    background: #f0f2f5;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    font-size: 0.9rem;
    color: #1e466e;
    margin: 0.2rem 0;
}
.info-item h2 {
    font-size: 1rem;
    margin: 0 0 0.25rem 0;
    color: rgb(0, 0, 109);
    border-left: 5px solid #0d6efd;
    padding-left: 0.5rem;
    font-weight: bold;
}
.info-item a { text-decoration: none; }

/* ========== FILTER BAR ========== */
.filter-row { margin: 1.5rem 0 2rem 0; display: flex; justify-content: flex-start; }
.filter-bar-horizontal {
    background: #ffffff;
    border-radius: 60px;
    padding: 0.6rem 1.5rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.200);
    border: 1px solid #e2e8f0;
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    width: auto;
}
.filter-label-horizontal {
    font-size: 0.85rem;
    font-weight: 600;
    color: rgb(0, 0, 109);
    display: flex;
    align-items: center;
    gap: 0.4rem;
    white-space: nowrap;
}
.filter-label-horizontal i { font-size: 0.8rem; }
.desktop-filter-horizontal { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.filter-btn-horizontal {
    background: transparent;
    border: none;
    padding: 0.4rem 1rem;
    border-radius: 40px;
    font-size: 0.8rem;
    font-weight: 500;
    color: #4a5568;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
    white-space: nowrap;
}
.filter-btn-horizontal:hover { background: #eef2ff; color: rgb(0, 0, 109); }
.filter-btn-horizontal.active { background: rgb(0, 0, 109); color: white; }
.mobile-filter-horizontal { display: none; }
.filter-select-horizontal {
    padding: 0.5rem 2rem 0.5rem 1rem;
    border: 1px solid #cbd5e1;
    border-radius: 40px;
    font-size: 0.8rem;
    background: white;
    cursor: pointer;
    font-family: inherit;
    font-weight: 500;
    color: #4a5568;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%234a5568' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
}
.filter-select-horizontal:focus { outline: none; border-color: rgb(0, 0, 109); }

/* Empty state */
.empty-message { text-align: center; padding: 3rem; color: #6c757d; font-size: 1.1rem; }
.empty-message i { font-size: 3rem; margin-bottom: 1rem; display: block; opacity: 0.5; }

/* ========== PAGE CONTENT ========== */
.page-content {
    margin-top: 130px;
    padding: 0 5% 3rem 5%;
    max-width: 1850px;
    margin-left: 2%;
    margin-right: auto;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 767px) {
    .work-hero-img { width: 90%; height: auto; }
    #left-hero img { height: 70px; width: 70px; display: none; }
    .technologies { font-size: 18px; }
    #details { margin-top: -8%; }
    .technologies h2 { margin-top: 2%; }
    .work-des h1, #left-hero h1 { font-size: 30px; margin-top: 7%; }
    #my_skills { margin-top: -15%; margin-left: 5%; }
    #skills_header { margin-top: 0%; }
    #research_header { margin-top: -15%; }
    .card { max-width: 100%; margin-left: 0; min-height: 380px; width: 100%; min-width: auto; }
    .modal-content { width: 95% !important; max-width: 95% !important; margin: 0; max-height: 90vh; }
    .modal-detail-row { flex-direction: column; }
    .modal-detail-row .work-hero-img { max-width: 80%; margin: 0 auto 1rem auto; display: block; }
    .modal-body { padding: 1.2rem; }
    .modal-header h2 { font-size: 1.2rem; }
    .section { margin-left: -5%; }
    .section-title { font-size: 1.5rem; }
    .cards-grid { grid-template-columns: 1fr; gap: 1.5rem; justify-items: center; }
    .filter-row { width: 100%; }
    .filter-bar-horizontal { display: flex; width: 100%; justify-content: space-between; flex-wrap: nowrap; }
    .desktop-filter-horizontal { display: none; }
    .mobile-filter-horizontal { display: block; width: auto; }
    .filter-select-horizontal { width: auto; min-width: 130px; }
    .page-content { margin-top: 75px; }
}
@media (min-width: 768px) and (max-width: 1024px) {
    .work-hero-img { width: 100%; height: auto; }
    .work-des h1 { font-size: 25px; }
    #left-hero h1 { font-size: 28px; }
    #left-hero img { height: 65px; width: 65px; display: none; }
    .technologies { font-size: 18px; }
    .technologies h2 { margin-top: 3%; }
    #my_skills { margin-top: -10%; }
    .cards-grid { grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
    .desktop-filter-horizontal { display: none; }
    .mobile-filter-horizontal { display: block; }
    .filter-bar-horizontal { width: 100%; justify-content: space-between; }
    .filter-row { width: 100%; }
}
@media (min-width: 1025px) and (max-width: 1440px) {
    .work-hero-img { width: 80%; height: auto; }
    .work-des h1 { font-size: 28px; }
    #details { margin-top: -2%; }
    #left-hero h1 { font-size: 40px; }
    .technologies { font-size: 19px; }
    .technologies h2 { margin-top: 3%; }
    #my_skills { margin-top: -8%; margin-left: 1.5%; }
    #skills_header { margin-top: -3%; }
    #research_header { margin-top: -8%; }
    .cards-grid { grid-template-columns: repeat(4, 1fr); gap: 2rem; }
}
@media (min-width: 1441px) {
    .work-hero-img { width: 65%; height: 100%; }
    .work-des h1 { font-size: 30px; }
    #left-hero h1 { font-size: 45px; }
    .todo-list { margin-top: -0.5%; font-size: 18px; }
    .order { color: rgb(0, 0, 109); font-weight: bold; }
    .paper { color: black; }
    .paper a { text-decoration: none; }
    #details { margin-top: 0%; }
    .technologies { font-size: 20px; }
    .technologies h2 { margin-top: 3%; }
    #my_skills { margin-top: -5%; margin-left: 1%; }
    #skills_header { margin-top: -3%; }
    #research_header { margin-top: -8%; }
    .cards-grid { grid-template-columns: repeat(4, 1fr); gap: 2rem; }
}