/* ============================================================
   style.css - Bibliografia VeP
   Mobile-first responsive stylesheet
   ============================================================ */

/* ------------------------------------------------------------
   Custom Properties
   ------------------------------------------------------------ */
:root {
    --font-serif: Georgia, 'Times New Roman', serif;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --color-text: #1a1a1a;
    --color-text-muted: #6b7280;
    --color-bg: #ffffff;
    --color-bg-alt: #f9fafb;
    --color-border: #e5e7eb;
    --color-primary: #2563eb;
    --color-pdf: #dc2626;
    --color-word: #2563eb;
    --color-excel: #16a34a;
    --color-ppt: #ea580c;
    --color-archive: #7c3aed;
    --color-link: #6b7280;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --radius: 6px;
    --transition: 0.2s ease;
}

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

html {
    -webkit-text-size-adjust: 100%;
    -moz-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    line-height: 1.6;
}

img,
svg {
    display: block;
    max-width: 100%;
    height: auto;
}

button,
input,
select,
textarea {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    color: inherit;
}

ul,
ol {
    list-style: none;
}

a {
    color: inherit;
    text-decoration: none;
}

table {
    border-collapse: collapse;
}

/* ------------------------------------------------------------
   Typography
   ------------------------------------------------------------ */
body {
    font-family: var(--font-serif);
    font-size: 1rem;
    color: var(--color-text);
    background-color: var(--color-bg);
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-sans);
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text);
}

h1 {
    font-size: 1.75rem;
}

h2 {
    font-size: 1.375rem;
    margin-bottom: 0.75rem;
}

h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

a {
    color: var(--color-primary);
    transition: color var(--transition);
}

a:hover,
a:focus {
    color: #1d4ed8;
    text-decoration: underline;
}

cite {
    font-style: italic;
}

/* ------------------------------------------------------------
   Layout
   ------------------------------------------------------------ */
.container {
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header */
.site-header {
    padding: 1.25rem 0;
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-bg);
}

.site-header__title {
    font-size: 1.25rem;
    font-weight: 700;
    font-family: var(--font-sans);
}

.site-header__title a {
    color: var(--color-text);
    text-decoration: none;
}

.site-header__title a:hover {
    color: var(--color-primary);
    text-decoration: none;
}

/* Main content */
.site-main {
    padding: 1.5rem 0 3rem;
    min-height: 60vh;
}

/* Footer */
.site-footer {
    padding: 1.5rem 0;
    border-top: 1px solid var(--color-border);
    background-color: var(--color-bg-alt);
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.site-footer__inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem 1.5rem;
    text-align: center;
}

.site-footer__brand {
    display: inline-flex;
    flex-wrap: wrap;
    align-items: baseline;
    justify-content: center;
    gap: 0.5rem;
}

.site-footer__name {
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: 0.01em;
    font-size: 0.9375rem;
}

.site-footer__slogan {
    font-style: italic;
}

.site-footer__meta {
    display: inline-flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.site-footer__dot {
    color: var(--color-border);
}

.site-footer__credit {
    color: inherit;
    text-decoration: none;
    border-bottom: 1px dotted currentColor;
    transition: color 0.15s ease;
}

.site-footer__credit:hover,
.site-footer__credit:focus-visible {
    color: var(--color-primary);
}

@media (max-width: 640px) {
    .site-footer__inner {
        flex-direction: column;
    }
}

/* ------------------------------------------------------------
   Skip Link (a11y)
   ------------------------------------------------------------ */
.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    z-index: 1000;
    padding: 0.75rem 1.5rem;
    background: var(--color-primary);
    color: #fff;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 0 0 var(--radius) 0;
}

.skip-link:focus {
    top: 0;
    color: #fff;
    text-decoration: none;
    outline: 2px solid #fff;
    outline-offset: 2px;
}

/* ------------------------------------------------------------
   Home Page - Books Grid
   ------------------------------------------------------------ */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.book-card {
    display: flex;
    flex-direction: column;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: box-shadow var(--transition), transform var(--transition);
}

.book-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.book-card__cover {
    aspect-ratio: 3 / 4;
    width: 100%;
    overflow: hidden;
    background-color: var(--color-bg-alt);
    display: flex;
    align-items: center;
    justify-content: center;
}

.book-card__cover img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.book-card__body {
    padding: 0.875rem 1rem;
    flex: 1;
    display: flex;
    align-items: center;
}

.book-card__title {
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--color-text);
    margin: 0;
}

.book-card a {
    text-decoration: none;
    color: inherit;
    display: block;
}

.book-card a:hover {
    text-decoration: none;
}

/* ------------------------------------------------------------
   Book Page - Header
   ------------------------------------------------------------ */
.book-header {
    margin-bottom: 2rem;
}

.book-header__image {
    width: 100%;
    overflow: hidden;
    border-radius: var(--radius);
    margin-bottom: 1.25rem;
}

.book-header__image img {
    width: 100%;
    height: auto;
    display: block;
}

.book-header__title {
    font-size: 1.75rem;
    margin-bottom: 0.75rem;
}

.book-header__description {
    font-size: 1rem;
    color: var(--color-text-muted);
    line-height: 1.7;
    max-width: 72ch;
}

/* ------------------------------------------------------------
   Search Bar
   ------------------------------------------------------------ */
.search-bar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-bg);
    padding: 0.75rem 0;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.search-bar__main {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.search-bar__input {
    flex: 1;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-family: var(--font-sans);
    font-size: 16px; /* 16px obbligatori: previene lo zoom automatico iOS Safari sul focus */
    background: var(--color-bg);
    transition: border-color var(--transition);
    -webkit-appearance: none;
    appearance: none;
}

.search-bar__input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.search-bar__input::placeholder {
    color: var(--color-text-muted);
}

.search-bar__toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-bg);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
    cursor: pointer;
    white-space: nowrap;
    transition: border-color var(--transition), background-color var(--transition);
}

.search-bar__toggle:hover {
    background: var(--color-bg-alt);
    border-color: #d1d5db;
}

.search-bar__toggle[aria-expanded="true"] {
    background: var(--color-bg-alt);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.search-bar__toggle-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.25rem;
    height: 1.25rem;
    padding: 0 0.375rem;
    border-radius: 999px;
    background: var(--color-primary);
    color: #fff;
    font-size: 0.6875rem;
    font-weight: 700;
    line-height: 1;
}

.search-bar__toggle-badge.hidden {
    display: none;
}

/* Filters panel */
.search-bar__filters {
    display: none;
    padding-top: 0.75rem;
    margin-top: 0.75rem;
    border-top: 1px solid var(--color-border);
}

.search-bar__filters.is-open {
    display: block;
}

.search-bar__filters-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.5rem;
}

.search-bar__filter-group label {
    display: block;
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.025em;
    margin-bottom: 0.25rem;
}

.search-bar__filter-group select {
    width: 100%;
    padding: 0.4375rem 2rem 0.4375rem 0.625rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M3 4.5L6 7.5L9 4.5'/%3E%3C/svg%3E") no-repeat right 0.625rem center;
    background-size: 12px;
    font-family: var(--font-sans);
    font-size: 16px; /* 16px obbligatori: previene lo zoom automatico iOS Safari sul focus */
    color: var(--color-text);
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
    transition: border-color var(--transition);
}

.search-bar__filter-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.search-bar__actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 0.75rem;
    gap: 0.75rem;
}

.search-bar__reset {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.375rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-bg);
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: color var(--transition), border-color var(--transition);
}

.search-bar__reset:hover {
    color: var(--color-text);
    border-color: #d1d5db;
}

/* Status counter */
.search-bar__status {
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    padding-top: 0.5rem;
}

/* ------------------------------------------------------------
   Bibliography Sections & Entries
   ------------------------------------------------------------ */
.bib-section {
    margin-bottom: 2.5rem;
}

.bib-section__header {
    font-size: 1.375rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-border);
    margin-bottom: 1rem;
    color: var(--color-text);
}

.bib-chapter {
    margin-bottom: 1.5rem;
}

.bib-chapter__header {
    font-size: 1.0625rem;
    padding-bottom: 0.375rem;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 0.75rem;
    color: var(--color-text-muted);
}

/* Entry row */
.bib-entry {
    display: flex;
    gap: 0.625rem;
    padding: 0.625rem 0.5rem;
    border-bottom: 1px solid transparent;
    transition: background-color var(--transition);
    align-items: center;
    color: inherit;
    text-decoration: none;
    border-radius: 6px;
}

a.bib-entry {
    cursor: pointer;
}

.bib-entry:hover {
    background-color: var(--color-bg-alt);
    text-decoration: underline;
}

.bib-entry + .bib-entry {
    border-top: 1px solid var(--color-border);
}

/* Entry icon */
.bib-entry__icon {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.bib-entry__icon svg {
    width: 24px;
    height: 24px;
}

.bib-entry__icon-link {
    flex-shrink: 0;
    margin-left: auto;
    display: inline-flex;
    color: inherit;
    text-decoration: none;
    transition: opacity var(--transition);
}

.bib-entry__icon-link:hover {
    opacity: 0.7;
}

.bib-entry > .bib-entry__icon {
    margin-left: auto;
}

.bib-entry__icon--pdf {
    color: var(--color-pdf);
}

.bib-entry__icon--word {
    color: var(--color-word);
}

.bib-entry__icon--excel {
    color: var(--color-excel);
}

.bib-entry__icon--powerpoint {
    color: var(--color-ppt);
}

.bib-entry__icon--archive {
    color: var(--color-archive);
}

.bib-entry__icon--link {
    color: var(--color-link);
}

/* Entry number (badge grigio) */
.bib-entry__number {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: #e5e7eb;
    color: #374151;
    border-radius: 6px;
    min-width: 2rem;
    height: 1.75rem;
    padding: 0 0.5rem;
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    font-weight: 700;
}

/* Nascondi numeri delle note se impostato sul libro */
.bib-list--no-numbers .bib-entry__number {
    display: none;
}

/* Entry content (tutto su una riga con wrap, font serif uniforme) */
.bib-entry__content {
    flex: 1;
    min-width: 0;
    font-family: var(--font-serif);
    font-size: 0.9375rem;
    line-height: 1.55;
    color: var(--color-text);
}

.bib-entry__author {
    font-weight: 700;
    color: inherit;
}

.bib-entry__et-alias {
    color: var(--color-text-muted);
    font-style: italic;
}

.bib-entry__description {
    font-style: italic;
    color: #147b97;
    font-weight: 600;
}

.bib-entry__publisher,
.bib-entry__date,
.bib-entry__extra {
    color: var(--color-text-muted);
}

.bib-entry__filesize {
    color: var(--color-text-muted);
    font-size: 0.75rem;
    margin-left: 0.25rem;
}

/* ------------------------------------------------------------
   Utility Classes
   ------------------------------------------------------------ */
.hidden {
    display: none !important;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ------------------------------------------------------------
   Breakpoints - Tablet (640px)
   ------------------------------------------------------------ */
@media (min-width: 640px) {
    .container {
        padding: 0 1.5rem;
    }

    h1 {
        font-size: 2rem;
    }

    .site-main {
        padding: 2rem 0 4rem;
    }

    .search-bar__filters-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .book-header__title {
        font-size: 2rem;
    }

    .bib-entry {
        padding: 0.75rem 0.5rem;
    }
}

/* ------------------------------------------------------------
   Breakpoints - Desktop (1024px)
   ------------------------------------------------------------ */
@media (min-width: 1024px) {
    .container {
        padding: 0 2rem;
    }

    h1 {
        font-size: 2.25rem;
    }

    .search-bar__filters-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .bib-entry__number {
        min-width: 2.5rem;
    }
}

/* ------------------------------------------------------------
   Print Stylesheet
   ------------------------------------------------------------ */
@media print {
    *,
    *::before,
    *::after {
        background: transparent !important;
        color: #000 !important;
        box-shadow: none !important;
        text-shadow: none !important;
    }

    body {
        font-size: 11pt;
        line-height: 1.5;
    }

    .container {
        max-width: 100%;
        padding: 0;
    }

    .search-bar,
    .skip-link,
    .site-footer {
        display: none !important;
    }

    .site-header {
        border-bottom: 2px solid #000;
        padding: 0.5rem 0;
    }

    .book-header__image {
        max-height: 200px;
    }

    .bib-entry {
        page-break-inside: avoid;
        border-bottom: 1px solid #ccc;
    }

    .bib-section {
        page-break-before: auto;
    }

    .bib-section__header {
        border-bottom-color: #000;
    }

    a[href]::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        color: #555 !important;
        word-break: break-all;
    }

    .bib-entry__icon,
    .bib-entry__icon-link {
        display: none;
    }

    .books-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}