:root {
    --bg-base: #09090b;
    --bg-sidebar: #101012;
    --bg-surface: #18181b;
    --bg-surface-hover: #27272a;
    --accent: #8b5cf6;
    --accent-glow: rgba(139, 92, 246, 0.3);
    --accent-gradient: linear-gradient(135deg, #8b5cf6, #6366f1);
    --text-primary: #f4f4f5;
    --text-secondary: #a1a1aa;
    --text-tertiary: #52525b;
    --border: #27272a;
    --border-hover: #3f3f46;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    --sidebar-width-collapsed: 72px;
    --sidebar-width-expanded: 240px;
    --header-height: 70px;
}

* {
    box-sizing: border-box;
    outline: none;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    height: 100vh;
    display: flex;
    overflow: hidden;
}

.sidebar {
    width: var(--sidebar-width-collapsed);
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 1.5rem 0.75rem;
    gap: 0.5rem;
    transition: width 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
    z-index: 50;
    flex-shrink: 0;
}

.sidebar:hover {
    width: var(--sidebar-width-expanded);
}

.main-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
    min-width: 0;
}

.brand-logo {
    height: 48px;
    display: flex;
    align-items: center;
    padding: 0 0.5rem;
    margin-bottom: 2rem;
    overflow: hidden;
    color: var(--text-primary);
    font-weight: 800;
    font-size: 1.25rem;
    letter-spacing: -0.5px;
    cursor: default;
}

.brand-icon {
    min-width: 32px;
    height: 32px;
    background: var(--accent-gradient);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    margin-right: 1rem;
    box-shadow: 0 0 15px var(--accent-glow);
    color: white;
}

.nav-button {
    display: flex;
    align-items: center;
    padding: 0.85rem;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
    overflow: hidden;
    position: relative;
}

.nav-button:hover {
    background: var(--bg-surface);
    color: var(--text-primary);
}

.nav-button.active {
    background: linear-gradient(90deg, rgba(139, 92, 246, 0.1), transparent);
    border-left: 3px solid var(--accent);
    color: var(--accent);
}

.nav-button svg {
    min-width: 24px;
    width: 24px;
    height: 24px;
    margin-right: 1rem;
}

a,
a:visited,
a:hover,
a:active {
    text-decoration: none;
}

.nav-button span {
    opacity: 0;
    transform: translateX(-10px);
    transition: 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.sidebar:hover .nav-button span {
    opacity: 1;
    transform: translateX(0);
}

.top-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 2rem;
    position: sticky;
    top: 0;
    z-index: 40;
}

.search-box {
    display: contents;
}

#search-input {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    padding: 0.5rem 1rem;
    color: var(--text-primary);
    width: 350px;
    transition: 0.2s;
    font-size: 0.9rem;
}

#search-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.content-view {
    flex: 1;
    overflow-y: auto;
    padding: 0 2rem 2rem 2rem;
}

.page {
    max-width: 1600px;
    margin: 0 auto;
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

#source-list {
    display: flex;
    gap: 1rem;
    padding-bottom: 1rem;
    scrollbar-width: none;
    align-items: center;
    flex-direction: row;
    scroll-behavior: smooth;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

#source-list::-webkit-scrollbar {
    height: 6px;
}

#source-list::-webkit-scrollbar-track {
    background: transparent;
}

#source-list::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

#source-list::-webkit-scrollbar-thumb:hover {
    background: var(--border-hover);
}

.source-button {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1rem;
    min-width: 200px;
    width: auto;
    height: auto;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
    overflow: hidden;
    text-align: left;
    flex-shrink: 0;
}

.source-button:hover {
    background: var(--bg-surface-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    color: var(--text-primary);
}

.source-button.active {
    border-color: var(--accent);
    background: linear-gradient(to right, rgba(139, 92, 246, 0.05), transparent);
    color: var(--text-primary);
}

.source-button img,
.source-button .brand-icon {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    object-fit: cover;
    flex-shrink: 0;
}

.source-text-wrapper {
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: hidden;
    line-height: 1.3;
}

.source-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.source-url {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.gallery-masonry {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 1rem;
}

.gallery-masonry:not(.books-only) {
    grid-auto-rows: 8px;
}

.image-entry:not([data-type="book"]) {
    margin-bottom: 0;
    border-radius: var(--radius-md);
    overflow: hidden;
    position: relative;
    background: var(--bg-surface);
    break-inside: avoid;
    transition: transform 0.2s;
    cursor: zoom-in;
    display: block;
    width: 100%;
}

.image-entry:not([data-type="book"]):hover {
    transform: scale(1.02);
    z-index: 2;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

.image-entry img {
    width: 100%;
    height: auto;
    display: block;
    aspect-ratio: auto;
}

.image-entry img.loaded {
    opacity: 1;
    transition: opacity 0.3s ease-in;
    min-height: unset;
}

.image-buttons {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 2rem 1rem 1rem 1rem;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.9), transparent);
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    opacity: 0;
    transition: 0.2s;
    top: auto;
    right: auto;
    flex-direction: row;
}

.image-entry:hover .image-buttons {
    opacity: 1;
}

.image-buttons button {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
    cursor: pointer;
    transition: 0.2s;
    padding: 0;
}

.image-buttons button:hover {
    background: var(--accent);
    border-color: var(--accent);
}

.image-buttons button svg {
    width: 16px;
    height: 16px;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.settings-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
}

.settings-card h3 {
    margin-top: 0;
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

fieldset {
    border: none;
    padding: 0;
    margin: 0;
}

label {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    margin-bottom: 0.5rem;
    transition: 0.2s;
}

label:hover {
    background: var(--bg-surface-hover);
}

input[type="radio"] {
    accent-color: var(--accent);
    margin-top: 4px;
    width: 1.2em;
    height: 1.2em;
}

.hidden {
    display: none !important;
}

.loading-state {
    text-align: center;
    padding: 4rem;
    color: var(--text-tertiary);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

#tag-info-modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

#tag-info-modal.hidden {
    display: none;
}

#tag-info-modal>div {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    padding: 2rem;
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 500px;
    position: relative;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    max-height: 80vh;
    overflow-y: auto;
}

#tag-info-close-button {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    font-size: 1.5rem;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 1rem;
}

#tag-info-content span {
    background: var(--bg-surface-hover);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
}

.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--bg-sidebar);
    border: 1px solid var(--border);
    border-left: 4px solid var(--accent);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    z-index: 1000;
    transform: translateY(20px);
    opacity: 0;
    pointer-events: none;
    transition: 0.3s;
    max-width: calc(100vw - 4rem);
}

.toast:not(.hidden) {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
}

#message-bar:not(.hidden) {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
}

#gallery-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 4rem 1rem;
    break-inside: avoid;
    column-span: all;
    grid-column: 1 / -1;
}

#gallery-placeholder p {
    max-width: 300px;
    text-align: center;
    white-space: normal;
    margin: 0;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.image-entry.newly-added {
    animation: fadeInUp 0.4s ease-out;
}

.hamburger {
    display: none;
    width: 42px;
    height: 42px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--bg-surface);
    color: var(--text-primary);
    font-size: 1.8rem;
    font-weight: bold;
    cursor: pointer;
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    transition: background 0.2s, border-color 0.2s;
    align-items: center;
    justify-content: center;
    z-index: 999;
}

.hamburger:hover {
    background: var(--bg-surface-hover);
    border-color: var(--accent);
}

@media (min-width: 1400px) {
    .gallery-masonry {
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    }
}

@media (min-width: 1024px) and (max-width: 1399px) {
    .gallery-masonry {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .content-view {
        padding: 0 1.5rem 2rem 1.5rem;
    }

    .top-header {
        padding: 0 1.5rem;
    }

    .gallery-masonry {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }

    #search-input {
        width: 280px;
    }

    .source-button {
        min-width: 180px;
    }

    .settings-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 767px) {
    html {
        font-size: 16px;
    }

    body {
        zoom: 1;
    }

    .content-view {
        overflow-x: hidden !important;
        padding: 0 1rem 2rem 1rem;
    }

    .top-header {
        height: 70px;
        padding: 0 1rem;
        justify-content: flex-start;
    }

    .hamburger {
        display: flex;
        position: static;
        transform: none;
        margin-right: auto;
    }

    #search-input {
        width: 100%;
        max-width: none;
        font-size: 1rem;
        padding: 0.6rem 1rem;
    }

    .sidebar {
        position: fixed;
        left: -100%;
        top: 0;
        width: 280px;
        height: 100%;
        background: var(--bg-sidebar);
        transition: left 0.3s ease;
        z-index: 300;
        padding: 1.5rem 1rem;
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.5);
    }

    .sidebar.active {
        left: 0;
    }

    .sidebar:hover {
        width: 280px;
    }

    .main-wrapper {
        margin-left: 0 !important;
        width: 100%;
    }

    .sidebar .nav-button span {
        opacity: 1 !important;
        transform: translateX(0) !important;
    }

    .sidebar nav {
        gap: 0.75rem !important;
    }

    .nav-button {
        padding: 1rem 1.25rem !important;
        font-size: 1rem !important;
    }

    .nav-button span {
        font-size: 1rem !important;
    }

    .nav-button svg {
        width: 24px !important;
        height: 24px !important;
        stroke-width: 2 !important;
        margin-right: 0.75rem !important;
    }

    .gallery-masonry {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 0.75rem;
    }

    .image-entry:not([data-type="book"]):hover {
        transform: none;
    }

    .image-buttons {
        opacity: 0.8;
        padding: 1.5rem 0.75rem 0.75rem 0.75rem;
    }

    .image-buttons button {
        width: 36px;
        height: 36px;
    }

    .image-buttons button svg {
        width: 18px;
        height: 18px;
    }

    #source-list {
        gap: 0.75rem;
        padding-bottom: 0.75rem;
    }

    .source-button {
        min-width: 160px;
        padding: 0.6rem 0.85rem;
        gap: 0.75rem;
    }

    .source-button img,
    .source-button .brand-icon {
        width: 28px;
        height: 28px;
    }

    .source-name {
        font-size: 0.9rem;
    }

    .source-url {
        font-size: 0.7rem;
    }

    .source-button:hover {
        transform: none;
    }

    .toast {
        bottom: 1rem;
        right: 1rem;
        left: 1rem;
        max-width: none;
        padding: 0.85rem 1rem;
        font-size: 0.9rem;
    }

    .loading-state {
        padding: 2rem 1rem;
    }

    #tag-info-modal>div {
        padding: 1.5rem;
        width: 95%;
    }

    .settings-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .settings-card {
        padding: 1.25rem;
    }

    h1, h2, h3 {
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .gallery-masonry {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 0.6rem;
    }

    .source-button {
        min-width: 140px;
        padding: 0.5rem 0.75rem;
    }

    .source-name {
        font-size: 0.85rem;
    }
}