@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    --primary-color: #000000;
    --accent-color: #000000;
    --hover-color: #333333;
    --bg-color: #ffffff;
    --card-bg: #ffffff;
    --text-main: #000000;
    --text-muted: #555555;
    --border-color: #dddddd;
    --font-heading: 'Inter', sans-serif;
    --font-body: 'Inter', sans-serif;
    --transition: all 0.2s ease-in-out;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Header */
.app-header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.logo {
    display: flex;
    flex-direction: column;
    text-align: center;
}

.logo h1 {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -1px;
    color: var(--text-main);
    text-transform: uppercase;
    margin-bottom: -5px;
}

.logo p {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
    font-weight: 600;
}

/* Navigation inside Header */
.header-nav {
    display: flex;
    gap: 30px;
    flex-grow: 1;
    justify-content: center;
}

.nav-btn {
    background: transparent;
    border: none;
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    cursor: pointer;
    padding: 10px 0;
    position: relative;
    border-radius: 0;
    transition: var(--transition);
}

.nav-btn::after {
    content: '';
    position: absolute;
    bottom: 0px;
    left: 0;
    width: 0%;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-btn:hover {
    color: var(--text-main);
}

.nav-btn.active {
    color: var(--text-main);
}

.nav-btn.active::after {
    width: 100%;
}

.header-search {
    flex-grow: 1;
    max-width: 250px;
    position: relative;
}

.header-search input {
    width: 100%;
    padding: 10px 10px 10px 35px;
    border: 1px solid var(--text-main);
    background: var(--bg-color);
    font-family: var(--font-body);
    font-size: 0.85rem;
    border-radius: 0;
    transition: var(--transition);
}

.header-search input:focus {
    outline: none;
    background: #fdfdfd;
}

.header-search i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-main);
}

.upload-btn {
    background: var(--primary-color);
    color: white;
    border: 1px solid var(--primary-color);
    padding: 10px 20px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    border-radius: 0;
}

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

/* Main Content Wrapper */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Hero Section */
.hero-section {
    text-align: center;
    padding: 60px 20px 80px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 60px;
}

.hero-title {
    font-size: 3.5rem;
    font-family: var(--font-heading);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: -1.5px;
    margin-bottom: 20px;
    color: var(--text-main);
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: 400;
    max-width: 700px;
    margin: 0 auto;
}

/* Group Headers */
.group-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--text-main);
    padding-bottom: 15px;
}

.group-header h2 {
    font-size: 1.8rem;
    font-family: var(--font-heading);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: -0.5px;
}

.view-all-btn {
    background: transparent;
    border: none;
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-main);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
}

.view-all-btn:hover {
    text-decoration: underline;
}

/* Horizontal Scroll */
.horizontal-scroll {
    display: flex;
    gap: 20px;
    overflow-x: auto;
    padding-bottom: 20px;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}

.horizontal-scroll::-webkit-scrollbar {
    height: 6px;
}

.horizontal-scroll::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 10px;
}

/* Featured Card */
.featured-card {
    min-width: 320px;
    height: 400px;
    position: relative;
    overflow: hidden;
    cursor: pointer;
    background: var(--border-color);
}

.featured-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.featured-card:hover img {
    transform: scale(1.03);
}

/* Category Cards Grid */
.category-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 60px;
}

.cat-card {
    background: var(--card-bg);
    cursor: pointer;
    text-align: center;
    transition: var(--transition);
}

.cat-card:hover .cat-card-img img {
    transform: scale(1.05);
}

.cat-card-img {
    width: 100%;
    aspect-ratio: 1;
    overflow: hidden;
    background: var(--border-color);
    margin-bottom: 15px;
}

.cat-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.cat-card-title {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-main);
}

.cat-card-count {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 400;
    margin-top: 5px;
    text-transform: none;
    letter-spacing: normal;
}

/* Gallery Header */
.gallery-header {
    text-align: center;
    margin: 40px 0 50px;
}

.gallery-header h2 {
    font-size: 2.8rem;
    font-family: var(--font-heading);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: -1px;
    margin-bottom: 10px;
}

.gallery-header p {
    font-size: 1.1rem;
    color: var(--text-muted);
}

/* Filters */
.categories-wrapper {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    padding: 0 20px;
}

.categories {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
}

.category-chip {
    padding: 8px 20px;
    background: transparent;
    border: 1px solid var(--border-color);
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-main);
}

.category-chip:hover {
    border-color: var(--text-main);
}

.category-chip.active {
    background: var(--text-main);
    color: white;
    border-color: var(--text-main);
}

.sub-filters-wrapper {
    margin-bottom: 50px;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
}

.sub-category-chip {
    padding: 6px 15px;
    background: transparent;
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
}

.sub-category-chip:hover {
    color: var(--text-main);
}

.sub-category-chip.active {
    color: var(--text-main);
    font-weight: 700;
    border-bottom: 2px solid var(--text-main);
}

/* Uniform Sequence Grid */
.masonry-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    align-items: stretch;
}

.gallery-item {
    background: var(--border-color);
    overflow: hidden;
    position: relative;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    aspect-ratio: 4/5;
}

.gallery-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.gallery-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    padding: 30px 20px 20px;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    opacity: 0;
    transition: var(--transition);
}

.gallery-item:hover .gallery-overlay {
    opacity: 1;
}

.post-category-tag {
    position: absolute;
    top: 15px;
    left: 15px;
    background: white;
    color: black;
    padding: 4px 10px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0;
    transform: translateY(-10px);
    transition: var(--transition);
}

.gallery-item:hover .post-category-tag {
    opacity: 1;
    transform: translateY(0);
}

.post-info {
    color: white;
}

.post-title {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 5px;
}

.post-author {
    font-size: 0.8rem;
    opacity: 0.9;
}

.post-actions {
    display: flex;
    gap: 10px;
}

.action-btn {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    backdrop-filter: blur(5px);
    transition: var(--transition);
    font-size: 0.9rem;
}

.action-btn:hover {
    background: white;
    color: black;
}

.action-btn.liked {
    color: #e60000;
    background: white;
}

/* Modals */
.post-detail-modal,
.upload-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    backdrop-filter: blur(5px);
}

.post-detail-modal.active,
.upload-modal.active {
    opacity: 1;
    pointer-events: all;
}

.detail-content,
.upload-content {
    background: var(--card-bg);
    max-width: 1000px;
    width: 95%;
    max-height: 90vh;
    border-radius: 0;
    display: flex;
    overflow: hidden;
    position: relative;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.upload-content {
    max-width: 600px;
    flex-direction: column;
    overflow-y: auto;
}

.detail-img-container {
    flex: 1.5;
    background: var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.detail-img-container img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.detail-info {
    flex: 1;
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    overflow-y: auto;
}

.detail-close,
.upload-close {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: var(--transition);
    z-index: 10;
}

.detail-close:hover,
.upload-close:hover {
    color: var(--text-main);
    transform: rotate(90deg);
}

.detail-title {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: -1px;
    margin-bottom: 10px;
    line-height: 1.2;
}

.detail-author {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.author-avatar {
    width: 45px;
    height: 45px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
}

.detail-tags {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 30px;
}

.detail-actions {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.detail-btn {
    flex: 1;
    padding: 15px;
    border: none;
    background: #f3f4f6;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.detail-btn:hover {
    background: #e5e7eb;
}

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

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

.detail-btn.primary.liked {
    background: white;
    color: #e60000;
    border: 1px solid #e60000;
}

/* Upload Modal Form */
.upload-body {
    padding: 40px;
}

.upload-body h2 {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: -1px;
    margin-bottom: 30px;
    text-align: center;
}

.upload-area {
    border: 2px dashed var(--border-color);
    text-align: center;
    padding: 50px 20px;
    margin-bottom: 30px;
    cursor: pointer;
    transition: var(--transition);
    background: #f9f9f9;
    position: relative;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: #f0f0f0;
}

.upload-area img {
    max-width: 100%;
    max-height: 300px;
    margin: 0 auto;
    display: none;
    object-fit: contain;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 1px solid var(--border-color);
    background: #fff;
    font-family: var(--font-body);
    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);
}

.submit-post-btn {
    width: 100%;
    padding: 18px;
    background: var(--primary-color);
    color: white;
    border: none;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 10px;
}

.submit-post-btn:hover {
    background: var(--hover-color);
}

/* Responsive */
@media (max-width: 900px) {
    .detail-content {
        flex-direction: column;
        overflow-y: auto;
    }

    .detail-img-container {
        height: 40vh;
        flex: none;
    }

    .header-nav {
        order: 3;
        width: 100%;
        margin-top: 15px;
        overflow-x: auto;
        justify-content: flex-start;
        padding-bottom: 10px;
    }

    .header-search {
        order: 2;
    }
}