/* --- ЗМІННІ --- */
:root {
    --paper-color: #f2ecd9; 
    --ink-color: #2c3e50;
    --active-line: #3f78e2;
    --mvs-blue: #3f78e2;
    --transition-speed: 0.5s;
}

/* --- ВКЛАДКИ (КНОПКИ) --- */
.book-tabs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
    width: calc(100% - 6px);
    max-width: 894px;
    margin-left: -1px;
    z-index: 10;
    position: relative;
    margin-bottom: 0;
}

.tab-btn {
    padding: 16px 5px;
    font-family: "Segoe UI", sans-serif;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: linear-gradient(to bottom, #2c3e50, #34495e);
    border: 1px solid #1a252f;
    border-bottom: none; 
    border-radius: 10px 10px 0 0;
    cursor: pointer;
    color: #ffffff;
    position: relative;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    text-align: center;
    outline: none;
}

.tab-btn.active {
    background: var(--paper-color);
    color: var(--ink-color);
    transform: translateY(-2px);
    border-top: 3px solid var(--active-line);
    border-left: 1px solid #c9c1ac;
    border-right: 1px solid #c9c1ac;
}

.tab-btn.active::after {
    content: "";
    position: absolute;
    bottom: 0; left: 0; width: 100%; height: 4px;
    background: linear-gradient(90deg, transparent, var(--active-line), transparent);
    background-size: 200% 100%;
    animation: shine-line 2s linear infinite;
}

@keyframes shine-line {
    0% { background-position: 200% 0; }
    100% { background-position: 0% 0; }
}

/* --- КОНТЕЙНЕР КНИГИ --- */
.book-container {
    width: 100%;
    max-width: 900px;
    position: relative;
    display: flex; 
    margin-top: -1px; 
    margin-left: -2px; 
    margin-bottom: 45px; 
    z-index: 1;
}

.book-background {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--paper-color);
    background-image: 
        linear-gradient(to right, rgba(0,0,0,0.05), transparent 10%, transparent 90%, rgba(0,0,0,0.05)),
        url("https://www.transparenttextures.com/patterns/paper-fibers.png");
    border-radius: 0 15px 15px 0;
    border-left: 6px solid #bdc3c7;
    box-shadow: 
        1px 0px 1px rgba(0,0,0,0.2),
        3px 3px 0 0 var(--paper-color), 3px 3px 2px 0 rgba(0,0,0,0.25),
        6px 6px 0 0 var(--paper-color), 6px 6px 2px 0 rgba(0,0,0,0.25),
        9px 9px 0 0 var(--paper-color), 9px 9px 2px 0 rgba(0,0,0,0.25),
        12px 12px 0 0 var(--paper-color), 12px 12px 2px 0 rgba(0,0,0,0.25);
}

/* СТОРІНКА */
.page {
    width: 100%;
    padding: 50px 70px;
    box-sizing: border-box;
    display: none; 
    flex-direction: column;
    z-index: 5;
    position: relative;
}

.page.active { display: flex; }

.page h2 {
    font-family: "Georgia", serif;
    font-size: 22px;
    color: #34495e;
    text-align: center;
    margin-bottom: 30px;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-bottom: 1px double rgba(0,0,0,0.1);
    padding-bottom: 15px;
}

/* --- СТИЛІЗАЦІЯ ТАБЛИЦІ (КАРТКА ПРАЦІВНИКА) --- */
.info-block {
    opacity: 0;
    transform: translateX(20px);
    transition: all 0.5s ease;
}

.page.active .info-block {
    opacity: 1;
    transform: translateX(0);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: rgba(255, 255, 255, 0.2); /* Легке висвітлення під текстом */
    border-radius: 8px;
    overflow: hidden;
}

/* ПІБ заголовок */
#staff-name {
    padding: 20px;
    color: var(--mvs-blue);
    font-family: "Georgia", serif;
    font-weight: 700;
    border-bottom: 2px solid var(--active-line);
    background: rgba(255,255,255,0.4);
}

/* Рядки таблиці */
table tbody tr {
    border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: background 0.3s;
}

table tbody tr:hover {
    background: rgba(255,255,255,0.3);
}

table td {
    padding: 15px 10px;
    font-family: "Segoe UI", sans-serif;
    font-size: 16px;
    color: #444;
    vertical-align: top;
}

/* Ліва колонка (Назви) */
table td:first-child {
    font-weight: 700;
    color: #2c3e50;
    width: 35%;
    text-align: right;
    padding-right: 20px;
    border-right: 1px solid rgba(0,0,0,0.05);
}

/* Права колонка (Значення) */
table td:last-child {
    padding-left: 20px;
    font-style: italic; /* Науковий стиль */
}

/* --- НАВІГАЦІЯ --- */
.staff-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-top: 1px solid rgba(0,0,0,0.1);
    margin-top: 30px;
}

.nav-arrow {
    background: none;
    border: none;
    color: var(--mvs-blue);
    font-weight: bold;
    text-transform: uppercase;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: 0.3s;
}

.nav-arrow:hover { color: #2c3e50; transform: scale(1.05); }
.nav-arrow.prev::before { content: "←"; }
.nav-arrow.next::after { content: "→"; }

.page-indicator {
    font-family: "Georgia", serif;
    font-style: italic;
    color: #7f8c8d;
    font-size: 14px;
}

/* АДАПТИВНІСТЬ */
@media (max-width: 600px) {
    .page { padding: 30px 20px; }
    table td { display: block; width: 100% !important; text-align: left !important; padding: 5px 10px; }
    table td:first-child { border-right: none; border-bottom: none; padding-top: 15px; }
}