/* Kardiotechnik Archiv - Frontend Styles v2.0 */

:root {
    --kt-primary: #1a4d8f;
    --kt-primary-dark: #0d3a6e;
    --kt-primary-light: #e8f0fe;
    --kt-secondary: #2c7a4b;
    --kt-text: #1e293b;
    --kt-text-light: #64748b;
    --kt-border: #e2e8f0;
    --kt-bg: #f8fafc;
    --kt-white: #ffffff;
    --kt-radius: 8px;
    --kt-shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --kt-shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
}

.kt-archive-wrapper {
    max-width: 960px;
    margin: 0 auto;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--kt-text);
}

/* Suchbereich */
.kt-search-section { margin-bottom: 2rem; }

.kt-search-form {
    background: var(--kt-white);
    border: 1px solid var(--kt-border);
    border-radius: var(--kt-radius);
    padding: 1.5rem;
    box-shadow: var(--kt-shadow);
}

.kt-search-main {
    display: flex;
    gap: 0.75rem;
}

.kt-search-main input[type="search"] {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid var(--kt-border);
    border-radius: var(--kt-radius);
    font-size: 1rem;
    transition: border-color 0.2s;
    outline: none;
}

.kt-search-main input[type="search"]:focus {
    border-color: var(--kt-primary);
    box-shadow: 0 0 0 3px rgba(26,77,143,0.1);
}

.kt-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border: none;
    border-radius: var(--kt-radius);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
    line-height: 1.4;
}

.kt-btn-primary { background: var(--kt-primary); color: var(--kt-white); }
.kt-btn-primary:hover { background: var(--kt-primary-dark); color: var(--kt-white); }

.kt-btn-secondary {
    background: var(--kt-bg);
    color: var(--kt-primary);
    border: 1px solid var(--kt-border);
}
.kt-btn-secondary:hover { background: var(--kt-primary-light); }

.kt-btn-outline {
    background: transparent;
    color: var(--kt-primary);
    border: 1px solid var(--kt-primary);
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
}
.kt-btn-outline:hover { background: var(--kt-primary); color: var(--kt-white); }
.kt-btn-sm { padding: 0.4rem 0.75rem; font-size: 0.8rem; }

/* Filter */
.kt-filters { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--kt-border); }
.kt-filter-row { display: flex; flex-wrap: wrap; gap: 1rem; align-items: end; }
.kt-filter-group { display: flex; flex-direction: column; gap: 0.25rem; flex: 1; min-width: 120px; }

.kt-filter-group label {
    font-size: 0.8rem; font-weight: 600;
    color: var(--kt-text-light); text-transform: uppercase; letter-spacing: 0.5px;
}

.kt-filter-group input, .kt-filter-group select {
    padding: 0.5rem; border: 1px solid var(--kt-border); border-radius: 6px; font-size: 0.9rem;
}

/* Ergebnisse */
.kt-results-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 1rem; color: var(--kt-text-light); font-size: 0.9rem;
}

.kt-results-list { display: flex; flex-direction: column; gap: 1rem; }

/* Artikelkarte */
.kt-article-card {
    background: var(--kt-white); border: 1px solid var(--kt-border);
    border-radius: var(--kt-radius); padding: 1.25rem; transition: box-shadow 0.2s;
}
.kt-article-card:hover { box-shadow: var(--kt-shadow-md); }

.kt-article-card-header {
    display: flex; justify-content: space-between; align-items: flex-start;
    gap: 1rem; margin-bottom: 0.5rem;
}

.kt-article-card-title {
    font-size: 1.1rem; font-weight: 600; color: var(--kt-primary); margin: 0; line-height: 1.4;
}
.kt-article-card-title a { color: inherit; text-decoration: none; }
.kt-article-card-title a:hover { text-decoration: underline; }

.kt-article-card-issue {
    font-size: 0.8rem; color: var(--kt-text-light); white-space: nowrap;
    background: var(--kt-bg); padding: 0.25rem 0.5rem; border-radius: 4px;
}

.kt-article-card-authors { font-size: 0.9rem; color: var(--kt-text); margin-bottom: 0.5rem; }
.kt-article-card-abstract { font-size: 0.9rem; color: var(--kt-text-light); line-height: 1.6; margin-bottom: 0.75rem; }

.kt-article-card-meta {
    display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center;
    font-size: 0.8rem; color: var(--kt-text-light);
}

.kt-keyword-tag {
    display: inline-block; padding: 0.2rem 0.5rem;
    background: var(--kt-primary-light); color: var(--kt-primary);
    border-radius: 4px; font-size: 0.8rem; text-decoration: none;
}
.kt-keyword-tag:hover { background: var(--kt-primary); color: var(--kt-white); }

.kt-article-card-actions {
    display: flex; gap: 0.5rem; margin-top: 0.75rem;
    padding-top: 0.75rem; border-top: 1px solid var(--kt-border);
}

.kt-doi-link { font-size: 0.8rem; color: var(--kt-secondary); text-decoration: none; font-family: monospace; }
.kt-doi-link:hover { text-decoration: underline; }

/* Artikel-Detail */
.kt-article-detail { max-width: 800px; margin: 0 auto; }
.kt-article-header { margin-bottom: 2rem; }

.kt-article-meta-top {
    display: flex; gap: 1rem; flex-wrap: wrap;
    font-size: 0.9rem; color: var(--kt-text-light); margin-bottom: 1rem;
}

.kt-article-title { font-size: 1.6rem; font-weight: 700; line-height: 1.3; margin: 0 0 0.5rem; }

.kt-article-title-en {
    font-size: 1.1rem; font-weight: 400; font-style: italic;
    color: var(--kt-text-light); margin: 0 0 1rem;
}

.kt-article-authors { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.kt-author-link { color: var(--kt-primary); text-decoration: none; font-weight: 500; }
.kt-author-link:hover { text-decoration: underline; }
.kt-author-link:not(:last-child)::after { content: ','; color: var(--kt-text); }

.kt-article-doi {
    margin: 1rem 0; padding: 0.75rem 1rem;
    background: var(--kt-primary-light); border-radius: var(--kt-radius);
    font-family: monospace; font-size: 0.9rem;
}

.kt-article-abstract, .kt-article-abstract-en {
    margin: 1.5rem 0; padding: 1rem; background: var(--kt-bg);
    border-left: 3px solid var(--kt-primary); border-radius: 0 var(--kt-radius) var(--kt-radius) 0;
}
.kt-article-abstract h3, .kt-article-abstract-en h3 {
    margin: 0 0 0.5rem; font-size: 0.9rem; text-transform: uppercase;
    letter-spacing: 0.5px; color: var(--kt-text-light);
}

.kt-article-keywords { margin: 1rem 0; display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; }
.kt-article-pdf { margin: 1.5rem 0; }

/* Zitation */
.kt-citation-section {
    margin-top: 2rem; padding: 1.5rem; background: var(--kt-bg);
    border-radius: var(--kt-radius); border: 1px solid var(--kt-border);
}
.kt-citation-section h3 { margin: 0 0 1rem; font-size: 1rem; }
.kt-citation-formats { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1rem; }

.kt-citation-output {
    background: var(--kt-white); border: 1px solid var(--kt-border);
    border-radius: var(--kt-radius); padding: 1rem;
}
.kt-citation-output pre {
    white-space: pre-wrap; word-break: break-word;
    font-size: 0.85rem; margin: 0 0 1rem; max-height: 200px; overflow-y: auto;
}

/* Loading & Feedback */
.kt-loading { display: flex; align-items: center; gap: 1rem; padding: 2rem; justify-content: center; color: var(--kt-text-light); }

.kt-spinner {
    width: 24px; height: 24px; border: 3px solid var(--kt-border);
    border-top-color: var(--kt-primary); border-radius: 50%; animation: kt-spin 0.8s linear infinite;
}
@keyframes kt-spin { to { transform: rotate(360deg); } }

.kt-no-results { text-align: center; padding: 3rem; color: var(--kt-text-light); }

/* Pagination */
.kt-pagination { display: flex; justify-content: center; gap: 0.25rem; margin-top: 2rem; }
.kt-pagination button, .kt-pagination span {
    padding: 0.5rem 0.75rem; border: 1px solid var(--kt-border);
    border-radius: 6px; background: var(--kt-white); cursor: pointer; font-size: 0.9rem;
}
.kt-pagination button:hover { background: var(--kt-primary-light); }
.kt-pagination .kt-page-active { background: var(--kt-primary); color: var(--kt-white); border-color: var(--kt-primary); }

/* Bibliografische Kopfzeile */
.kt-article-biblio {
    display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center;
    font-size: 0.9rem; color: var(--kt-text-light);
    padding: 0.75rem 0; border-bottom: 1px solid var(--kt-border); margin-bottom: 1rem;
}
.kt-article-journal { font-weight: 600; color: var(--kt-primary); }
.kt-article-authors-line { font-size: 1rem; margin-bottom: 0.75rem; line-height: 1.6; }

/* PDF-Viewer */
.kt-article-original { margin: 2rem 0; }
.kt-article-original h3 { margin: 0 0 1rem; font-size: 1.1rem; }

.kt-pdf-viewer {
    border: 1px solid var(--kt-border); border-radius: var(--kt-radius);
    overflow: hidden; background: #525659; margin-bottom: 1rem;
}
.kt-pdf-embed {
    width: 100%; height: 80vh; min-height: 600px; display: block; border: none;
}

.kt-pdf-actions {
    display: flex; gap: 1rem; align-items: center; flex-wrap: wrap;
}
.kt-pdf-page-hint {
    font-size: 0.85rem; color: var(--kt-text-light); font-style: italic;
}

/* Zitation */
.kt-citation-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }

/* Archivar */
.kt-archivar-actions {
    margin-top: 2rem; padding: 1.25rem; border: 1px dashed var(--kt-border);
    border-radius: var(--kt-radius); background: #fefce8;
}
.kt-archivar-actions h3 { margin: 0 0 0.75rem; font-size: 0.95rem; color: #854d0e; }
.kt-archivar-buttons { display: flex; gap: 0.5rem; flex-wrap: wrap; align-items: center; }

.kt-doi-status { padding: 0.25rem 0.75rem; border-radius: 12px; font-size: 0.85rem; font-weight: 500; }
.kt-doi-status-registered { background: #dcfce7; color: #166534; }
.kt-doi-status-submitted { background: #dbeafe; color: #1e40af; }
.kt-doi-status-pending { background: #fef3c7; color: #92400e; }
.kt-doi-status-failed { background: #fee2e2; color: #991b1b; }
.kt-doi-status-nicht\ registriert { background: #f1f5f9; color: #475569; }

/* ============================== */
/* Smartphone-Optimierung         */
/* ============================== */

@media (max-width: 768px) {
    .kt-archive-wrapper { padding: 0 0.25rem; }

    .kt-search-form { padding: 0.75rem; }

    .kt-search-main { flex-direction: column; }
    .kt-search-main input[type="search"] { font-size: 16px; /* verhindert iOS-Zoom */ }

    .kt-filter-row { flex-direction: column; gap: 0.5rem; }
    .kt-filter-group { min-width: 100%; }

    .kt-article-card { padding: 0.75rem; }
    .kt-article-card-header { flex-direction: column; gap: 0.25rem; }
    .kt-article-card-title { font-size: 1rem; }
    .kt-article-card-actions { flex-direction: column; gap: 0.5rem; }
    .kt-article-card-actions .kt-btn { text-align: center; justify-content: center; }

    /* Einzelartikel */
    .kt-article-detail { padding: 0; }
    .kt-article-title { font-size: 1.2rem !important; }
    .kt-article-title-en { font-size: 0.95rem; }
    .kt-article-biblio { font-size: 0.8rem; flex-direction: column; gap: 0.25rem; }
    .kt-article-doi { font-size: 0.8rem; padding: 0.5rem; word-break: break-all; }
    .kt-article-abstract, .kt-article-abstract-en { padding: 0.75rem; margin: 1rem 0; }

    .kt-citation-section { padding: 1rem; }
    .kt-citation-formats { flex-direction: column; }
    .kt-citation-formats .kt-btn { text-align: center; justify-content: center; }

    .kt-archivar-buttons { flex-direction: column; }
    .kt-archivar-buttons .kt-btn { text-align: center; justify-content: center; }

    .kt-pdf-actions { flex-direction: column; }
}

@media (max-width: 480px) {
    .kt-search-form { padding: 0.5rem; border-radius: 0; }
    .kt-article-card { border-radius: 0; border-left: none; border-right: none; }
    .kt-results-list { gap: 0; }
    .kt-article-card + .kt-article-card { border-top: none; }
    .kt-keyword-tag { font-size: 0.7rem; padding: 0.15rem 0.4rem; }
}