@charset "utf-8";
/* CSS Document - GIAO DIỆN LUMINA STYLE - THƯ VIỆN NEXUS LIBRARY */

:root {
    --bg-dark-brown: #5C453A;
    --bg-header: #2B1E1A;
    --bg-light: #F5F2EC;
    --bg-card: #FFFFFF;
    --text-gold: #D2A86E;
    --text-dark: #3D2D27;
    --text-muted: #7A6960;
    --border-color: #E0D7CD;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--bg-light);
    color: var(--text-dark);
}

/* 1. HEADER */
header {
    background-color: var(--bg-header);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 50px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo-area img {
    height: 35px;
    width: auto;
    object-fit: contain;
}

.logo-text h1 {
    font-size: 13px;
    color: #FFFFFF;
    font-weight: 700;
    line-height: 1.2;
    text-transform: uppercase;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 25px;
    align-items: center;
}

nav ul li a {
    text-decoration: none;
    color: #E2D9CF;
    font-size: 13px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: color 0.2s;
}

nav ul li a.active, nav ul li a:hover {
    color: var(--text-gold);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 15px;
    color: #E2D9CF;
    font-size: 15px;
    cursor: pointer;
}

/* 2. HERO BANNER */
.hero-lumina {
    background-color: var(--bg-dark-brown);
    padding: 60px 20px;
    text-align: center;
    position: relative;
    border-bottom: 2px solid var(--border-color);
}

.hero-frame-border {
    border: 2px solid rgba(255, 255, 255, 0.8);
    border-radius: 8px;
    padding: 35px 25px;
    max-width: 850px;
    margin: 0 auto;
    background: rgba(0, 0, 0, 0.1);
}

.hero-frame-border h2 {
    font-size: 26px;
    font-weight: 600;
    color: #FFFFFF;
    margin-bottom: 10px;
}

.hero-frame-border p {
    font-size: 16px;
    color: #F0E8DF;
    letter-spacing: 0.5px;
}

/* 3. BANNER TĨNH */
.slider-container-box {
    max-width: 1200px;
    margin: 30px auto;
    padding: 0 20px;
}

.hero-slider-container {
    width: 100%;
    height: 320px;
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    background: var(--bg-dark-brown);
    border: 1px solid var(--border-color);
}

.slide-item {
    width: 100%;
    height: 100%;
}

.slide-placeholder {
    width: 100%;
    height: 100%;
}

/* 4. THANH TÌM KIẾM */
.search-section-bar {
    max-width: 1200px;
    margin: 0 auto 30px auto;
    padding: 0 20px;
}

.search-box-large {
    background: #FFFFFF;
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 8px 18px;
    border-radius: 50px;
    width: 100%;
}

.search-box-large i {
    color: var(--bg-dark-brown);
    font-size: 18px;
    margin-right: 12px;
}

.search-box-large input {
    border: none;
    outline: none;
    flex: 1;
    font-size: 15px;
    color: var(--text-dark);
    background: transparent;
}

.search-box-large button {
    background-color: var(--bg-dark-brown);
    color: #FFFFFF;
    border: none;
    padding: 10px 30px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: 0.2s;
}

.search-box-large button:hover {
    background-color: #423129;
}

/* 5. KHÁM PHÁ THƯ VIỆN BAR */
.explore-container {
    max-width: 1200px;
    margin: 0 auto 35px auto;
    padding: 0 20px;
}

.explore-bar {
    background: #FFFFFF;
    padding: 16px 22px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    border: 1px solid var(--border-color);
    width: 100%;
}

.explore-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 14px;
    color: var(--bg-dark-brown);
    width: 200px;
    flex-shrink: 0;
    border-right: 1px solid var(--border-color);
    padding-right: 18px;
}

.explore-items {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex: 1;
    padding-left: 18px;
    gap: 15px;
}

.ex-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-decoration: none;
    color: inherit;
    flex: 1;
}

.ex-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.ex-info i {
    font-size: 16px;
    color: var(--bg-dark-brown);
    background: #F0E9E2;
    padding: 8px;
    border-radius: 6px;
}

.ex-text h5 { font-size: 12px; color: var(--text-dark); margin-bottom: 2px; }
.ex-text p { font-size: 10px; color: var(--text-muted); }

/* 6. TIÊU ĐỀ NÂU & 3 SÁCH NỔI BẬT */
.lumina-section-header {
    background-color: var(--bg-dark-brown);
    color: #FFFFFF;
    padding: 22px 50px;
    margin-bottom: 25px;
}

.lumina-section-header h3 {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

.main-content-wrapper {
    max-width: 1200px;
    margin: 0 auto 40px auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 30px;
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
}

.book-card {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    background: #FFFFFF;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.book-img-placeholder {
    background: #F0EAE2;
    border: 1px dashed #B8AAA0;
    height: 140px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 10px;
    overflow: hidden;
}

.book-card h5 { font-size: 13px; color: var(--text-dark); margin-bottom: 4px; }
.book-card p { font-size: 11px; color: var(--text-muted); margin-bottom: 10px; }
.book-card a { font-size: 11px; color: var(--bg-dark-brown); font-weight: 700; text-decoration: none; }

.news-box {
    background: #FFFFFF;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
}

.news-box h4 {
    font-size: 16px;
    color: var(--bg-dark-brown);
    margin-bottom: 15px;
    text-transform: uppercase;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 8px;
}

.news-list { display: flex; flex-direction: column; gap: 15px; }
.news-item { display: flex; gap: 12px; padding-bottom: 12px; border-bottom: 1px solid var(--border-color); }
.news-img { width: 70px; height: 50px; background: #E0D7CD; border-radius: 6px; flex-shrink: 0; overflow: hidden; }
.news-content h5 { font-size: 12px; color: var(--text-dark); }

/* 7. KHỐI SỨ MỆNH */
.mission-lumina-section {
    background-color: var(--bg-dark-brown);
    color: #FFFFFF;
    padding: 50px;
    display: flex;
    align-items: center;
    gap: 40px;
    margin-bottom: 40px;
}

.mission-text-area { flex: 1; }
.mission-text-area p {
    font-size: 15px;
    line-height: 1.8;
    color: #F0E8DF;
    margin-bottom: 25px;
}

.mission-btn {
    background-color: #FFFFFF;
    color: var(--bg-dark-brown);
    padding: 10px 35px;
    border-radius: 4px;
    font-weight: 700;
    text-decoration: none;
    display: inline-block;
}

.mission-image-holder {
    width: 380px;
    height: 240px;
    border-radius: 8px;
    overflow: hidden;
    flex-shrink: 0;
}

/* 8. FOOTER */
footer {
    background-color: #EAE4DC;
    color: var(--text-dark);
    padding: 45px 50px 20px 50px;
    border-top: 1px solid var(--border-color);
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 30px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
}

.footer-col h5 {
    color: var(--bg-dark-brown);
    font-size: 14px;
    margin-bottom: 12px;
    text-transform: uppercase;
    font-weight: 700;
}

.footer-col p { font-size: 12px; line-height: 1.6; color: var(--text-muted); }

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 20px;
    font-size: 12px;
    color: var(--text-muted);
}
.social-icons i { font-size: 16px; color: var(--bg-dark-brown); margin-left: 15px; }