/* ==========================================================================
   STUDIO STUDIO — BOOK LIBRARY
   Radical minimalist design. Typographic. Systematic.
   ========================================================================== */

/* Font faces — Riforma for titles, IBM Plex Mono for everything else */
@font-face {
    font-family: 'Riforma';
    src: url('/booklibrary/fonts/RiformaRegular.woff2') format('woff2'),
         url('/booklibrary/fonts/RiformaRegular.woff') format('woff');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}
@font-face {
    font-family: 'Riforma';
    src: url('/booklibrary/fonts/RiformaLight.woff2') format('woff2'),
         url('/booklibrary/fonts/RiformaLight.woff') format('woff');
    font-weight: 300;
    font-style: normal;
    font-display: swap;
}
@font-face {
    font-family: 'IBM Plex Mono';
    src: url('/booklibrary/fonts/IBMPlexMono-Regular.woff') format('woff'),
         url('/booklibrary/fonts/IBMPlexMono-Regular.ttf') format('truetype');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

:root {
    --bg: #FFFFFF;
    --fg: #000000;
    --border: #000000;
    --meta: #555555;
    --font-title: 'Riforma', -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    --font-mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
    --font: var(--font-mono); /* base text = mono */
}

[data-theme="dark"] {
    --bg: #000000;
    --fg: #FFFFFF;
    --border: #FFFFFF;
    --meta: #999999;
}

/* Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font);
    background-color: var(--bg);
    color: var(--fg);
    transition: background-color 0.2s, color 0.2s;
    min-height: 100vh;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 4px 12px;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg);
}

.header-title {
    font-family: var(--font-title);
    font-size: 48px;
    font-weight: 400;
    letter-spacing: 0;
    text-transform: uppercase;
    text-decoration: none;
    color: var(--fg);
    line-height: 1;
    /* optical centering — caps sit high in the line box, nudge down */
    transform: translateY(0.1em);
}

.header-nav {
    display: flex;
    align-items: stretch;
    gap: 0;
    border: 1px solid var(--border);
}

.nav-link {
    background: none;
    border: none;
    border-right: 1px solid var(--border);
    cursor: pointer;
    color: var(--fg);
    font-family: var(--font);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    text-decoration: none;
    padding: 6px 12px;
    display: flex;
    align-items: center;
    line-height: 1;
}

.nav-link:last-child {
    border-right: none;
}

.nav-link:hover {
    background: var(--fg);
    color: var(--bg);
}

.nav-link.active {
    background: var(--fg);
    color: var(--bg);
}

/* Mode toggle — studiostudio.be style */
.nav-mode {
    display: flex;
    align-items: center;
    padding: 6px 12px;
    border-right: 1px solid var(--border);
    font-family: var(--font);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    line-height: 1;
    gap: 0;
}

.nav-mode-label {
    font-size: 7px;
    text-transform: lowercase;
    position: relative;
    top: -0.3em;
    padding-right: 0.5em;
    color: var(--meta);
}

.nav-mode-btn {
    background: none;
    border: none;
    font: inherit;
    color: inherit;
    padding: 0;
    cursor: pointer;
    line-height: 1;
    text-transform: uppercase;
}

.nav-mode-btn.is-off {
    text-decoration: line-through;
}

.nav-mode-btn:hover {
    text-decoration: none;
    opacity: 0.6;
}

.nav-mode-sep {
    padding: 0 2px;
    pointer-events: none;
}

/* Color sort button */
.nav-color-btn {
    display: flex !important;
    align-items: center;
    gap: 0;
    padding: 6px 8px !important;
}

.color-swatch {
    display: inline-block;
    width: 8px;
    height: 12px;
    border-right: 1px solid var(--border);
}

.color-swatch:first-child {
    border-left: 1px solid var(--border);
}

.nav-color-btn.active .color-swatch {
    border-color: var(--bg);
}

.nav-color-btn.desc .color-swatch {
    border-color: var(--bg);
}

/* Filter panel */
.filter-panel {
    display: none;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
}

.filter-panel.active {
    display: block;
}

.search-input {
    width: 100%;
    padding: 10px 0;
    border: none;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
    font-family: var(--font);
    background: transparent;
    color: var(--fg);
    outline: none;
}

.search-input::placeholder {
    color: var(--meta);
}

.filter-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}

.sort-row {
    align-items: center;
}

.filter-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--meta);
    margin-right: 4px;
}

.sort-direction-btn {
    background: none;
    border: 1px solid var(--border);
    cursor: pointer;
    padding: 4px 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--fg);
}

.sort-direction-btn svg {
    stroke: var(--fg);
    fill: none;
    stroke-width: 1.5;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.filter-tag {
    padding: 5px 10px;
    font-size: 11px;
    font-family: var(--font);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--fg);
    cursor: pointer;
    transition: background-color 0.15s, color 0.15s;
}

.filter-tag:hover,
.filter-tag.active {
    background: var(--fg);
    color: var(--bg);
}

/* Book grid */
.grid {
    display: grid;
    grid-template-columns: repeat(10, 1fr);
    gap: 0;
    border-left: 1px solid var(--border);
}

.grid-item {
    border-right: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    min-width: 0;
    overflow: hidden;
    transition: background-color 0.12s ease, color 0.12s ease;
}

/* Invert-on-hover — Studio Studio signature. Cover image stays untouched. */
.grid-item:hover {
    background: var(--fg);
    color: var(--bg);
}

.grid-item:hover a,
.grid-item:hover .grid-author {
    color: var(--bg);
}

.grid-item:hover .grid-info {
    border-top-color: var(--border);
}

.grid-item:hover .grid-cover {
    background: var(--fg);
}

.grid-item a {
    display: flex;
    flex-direction: column;
    height: 100%;
    text-decoration: none;
    color: var(--fg);
}

.grid-cover {
    width: 100%;
    aspect-ratio: 2 / 3; /* uniform cover area for every book */
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: var(--bg);
}

.grid-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover; /* fill the cover area completely */
    display: block;
}

.grid-cover .no-cover {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--meta);
}

.grid-info {
    padding: 5px;
    border-top: 1px solid var(--border);
}

.grid-title {
    font-family: var(--font-title);
    font-size: 13px;
    font-weight: 400;
    line-height: 1.3;
    margin-bottom: 2px;
    overflow-wrap: anywhere; /* wrap long words instead of cutting off */
}

.grid-author {
    font-size: 11px;
    color: var(--meta);
    line-height: 1.3;
    overflow-wrap: anywhere; /* full author shown, never truncated */
}

/* Empty state */
.empty-state {
    grid-column: 1 / -1;
    padding: 80px 20px;
    text-align: center;
    font-size: 13px;
    color: var(--meta);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-right: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

/* Modal overlay */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 1000;
    overflow-y: auto;
    display: none;
    align-items: center;
    justify-content: center;
}

[data-theme="dark"] .modal-overlay {
    background: rgba(255, 255, 255, 0.15);
}

.modal-overlay.active {
    display: flex;
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--fg);
    z-index: 1001;
    padding: 4px;
}

.modal-close svg {
    width: 20px;
    height: 20px;
    stroke: var(--fg);
    fill: none;
    stroke-width: 1.5;
}

.modal-content {
    position: relative;
    max-width: 800px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    margin: 0 auto;
    padding: 40px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    background: var(--bg);
    border: 1px solid var(--border);
}

.modal-cover {
    width: 100%;
}

.modal-cover img {
    width: 100%;
    display: block;
}

.modal-cover .no-cover-large {
    aspect-ratio: 2 / 3;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--meta);
}

.modal-details {
    padding-top: 10px;
}

.modal-title {
    font-family: var(--font-title);
    font-size: 24px;
    font-weight: 400;
    line-height: 1.2;
    margin-bottom: 8px;
}

.modal-author {
    font-size: 14px;
    margin-bottom: 30px;
}

.modal-meta {
    font-size: 12px;
    color: var(--meta);
    line-height: 2;
    margin-bottom: 24px;
}

.modal-meta span {
    display: block;
}

.modal-meta strong {
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 10px;
    color: var(--fg);
    margin-right: 8px;
}

.modal-summary {
    font-size: 13px;
    line-height: 1.7;
    margin-bottom: 24px;
}

.modal-edit-btn {
    display: inline-block;
    font-family: var(--font);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    text-decoration: none;
    color: var(--fg);
    border: 1px solid var(--border);
    padding: 6px 12px;
}

.modal-edit-btn:hover {
    background: var(--fg);
    color: var(--bg);
}

/* Loading state */
.loading {
    grid-column: 1 / -1;
    padding: 80px 20px;
    text-align: center;
    font-size: 12px;
    color: var(--meta);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border-right: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

/* Focus styles for keyboard navigation */
.nav-link:focus-visible,
.nav-mode-btn:focus-visible,
.filter-tag:focus-visible,
.sort-direction-btn:focus-visible,
.modal-close:focus-visible {
    outline: 1px solid var(--fg);
    outline-offset: 1px;
}

.grid-item a:focus-visible {
    outline: 1px solid var(--fg);
    outline-offset: -1px;
}

.search-input:focus-visible {
    border-bottom-color: var(--fg);
}

/* Responsive: 8 columns on large tablet / small desktop */
@media (max-width: 1400px) {
    .grid {
        grid-template-columns: repeat(8, 1fr);
    }
}

/* Responsive: 4 columns on tablet */
@media (max-width: 1024px) {
    .grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Responsive: 2 columns on mobile */
@media (max-width: 768px) {
    .grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .modal-content {
        grid-template-columns: 1fr;
        padding: 40px 16px 24px;
        gap: 24px;
        width: 95%;
    }

    .modal-cover {
        max-width: 300px;
    }

    .modal-title {
        font-size: 20px;
    }

    .header {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
        padding: 4px 8px;
    }

    .header-title {
        font-size: 28px;
    }

    .header-nav {
        flex-wrap: wrap;
        border: none;
    }

    .header-nav > * {
        border: 1px solid var(--border);
        margin-top: -1px;
        margin-right: -1px;
        flex: 1;
        justify-content: center;
        text-align: center;
    }

    .nav-link:last-child {
        border-right: 1px solid var(--border);
    }

    .grid-info {
        padding: 10px;
    }

    .grid-title {
        font-size: 12px;
    }

    .grid-author {
        font-size: 10px;
    }
}

@media (max-width: 480px) {
    .grid-info {
        padding: 8px;
    }
}