/* ============================================
   BOOK STYLE - MAIN CSS
   ============================================ */

/* ============================================
   COLOR VARIABLES (Easy to switch)
   ============================================ */
:root {
    /* Primary Colors */
    --gold: #c9a84c;
    --gold-light: #e8d5a3;
    --gold-dark: #a8893a;
    --silver: #c0c0c0;
    --silver-light: #e8e8e8;
    --silver-dark: #999999;
    
    /* Background Colors */
    --bg-body: #ffffff;
    --bg-book-cover: #f8f8f8;
    --bg-book-pages: #ffffff;
    --bg-card-front: #ffffff;
    --bg-card-back: #f5f5f5;
    
    /* Text Colors */
    --text-primary: #1a1a1a;
    --text-secondary: #555555;
    --text-light: #888888;
    --text-white: #ffffff;
    
    /* Border Colors */
    --border-light: #e8e8e8;
    --border-dark: #cccccc;
    
    /* Shadow Colors */
    --shadow-light: rgba(0,0,0,0.06);
    --shadow-medium: rgba(0,0,0,0.1);
    --shadow-dark: rgba(0,0,0,0.15);
    
    /* Font Family */
    --font-primary: 'Georgia', 'Times New Roman', serif;
    --font-secondary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    
    /* Spacing */
    --spacing-sm: 10px;
    --spacing-md: 20px;
    --spacing-lg: 30px;
    --spacing-xl: 40px;
}

/* ============================================
   GLOBAL STYLES
   ============================================ */

body {
    font-family: var(--font-secondary);
    background: var(--bg-body);
    color: var(--text-primary);
    padding-top: 80px;
    min-height: 100vh;
}

/* ============================================
   BOOK WRAPPER
   ============================================ */

.book-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px 40px;
}

/* ============================================
   BOOK COVER
   ============================================ */

.book-cover {
    background: var(--bg-book-cover);
    border-radius: 12px;
    box-shadow: 
        0 4px 20px var(--shadow-medium),
        0 1px 4px var(--shadow-light);
    padding: 25px;
    position: relative;
    border: 1px solid var(--border-light);
}

/* ============================================
   BOOK PAGES
   ============================================ */

.book-pages {
    background: var(--bg-book-pages);
    border-radius: 8px;
    padding: 35px;
    min-height: 400px;
    position: relative;
}

/* Page Fold Effect */
.book-pages::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 30px;
    height: 30px;
    background: linear-gradient(135deg, transparent 50%, var(--shadow-light) 50%);
    border-radius: 0 8px 0 0;
}

/* ============================================
   PAGE TITLE
   ============================================ */

.page-title {
    text-align: center;
    padding: 10px 0 25px;
    border-bottom: 2px solid var(--border-light);
    margin-bottom: 25px;
}

.page-title h1 {
    font-size: 42px;
    font-weight: 700;
    color: var(--text-primary);
    font-family: var(--font-primary);
    letter-spacing: 1px;
    margin: 0;
}

.page-title h1 span {
    color: var(--gold);
}

.page-title p {
    font-size: 17px;
    color: var(--text-secondary);
    margin-top: 8px;
    font-family: var(--font-primary);
}

.page-title .bookmark-icon {
    color: var(--gold);
    font-size: 20px;
    margin: 0 8px;
}

/* ============================================
   CHAPTER DIVIDER
   ============================================ */

.chapter-divider {
    text-align: center;
    margin: 30px 0 20px;
    color: var(--silver-dark);
    font-family: var(--font-primary);
    font-size: 13px;
    letter-spacing: 4px;
    text-transform: uppercase;
    opacity: 0.6;
}

.chapter-divider::before,
.chapter-divider::after {
    content: '◆';
    margin: 0 12px;
    color: var(--gold);
    opacity: 0.5;
}

/* ============================================
   FLIP GRID
   ============================================ */

.flip-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 25px;
    margin: 25px 0 10px;
}

/* ============================================
   FLIP CARD
   ============================================ */

.flip-card {
    background: transparent;
    height: 260px;
    perspective: 1000px;
    cursor: pointer;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
}

.flip-card.flipped .flip-card-inner {
    transform: rotateY(180deg);
}

/* ============================================
   FLIP CARD - FRONT
   ============================================ */

.flip-card-front,
.flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 10px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    box-shadow: 0 2px 12px var(--shadow-light);
}

.flip-card-front {
    background: var(--bg-card-front);
    border: 1px solid var(--border-light);
    color: var(--text-primary);
}

.flip-card-front i {
    font-size: 42px;
    color: var(--gold);
    margin-bottom: 12px;
    transition: transform 0.3s ease;
}

.flip-card:hover .flip-card-front i {
    transform: scale(1.1);
}

.flip-card-front h3 {
    font-size: 20px;
    font-weight: 700;
    font-family: var(--font-primary);
    margin-bottom: 8px;
    color: var(--text-primary);
}

.flip-card-front p {
    font-size: 13px;
    color: var(--text-secondary);
    font-family: var(--font-primary);
    margin: 0;
}

.flip-card-front .page-corner {
    position: absolute;
    bottom: 10px;
    right: 12px;
    font-size: 11px;
    color: var(--silver);
    opacity: 0.4;
}

/* ============================================
   FLIP CARD - BACK
   ============================================ */

.flip-card-back {
    background: var(--bg-card-back);
    border: 1px solid var(--border-light);
    color: var(--text-primary);
    transform: rotateY(180deg);
}

.flip-card-back i {
    font-size: 28px;
    color: var(--silver);
    margin-bottom: 12px;
}

.flip-card-back h4 {
    font-size: 18px;
    font-weight: 700;
    font-family: var(--font-primary);
    margin-bottom: 8px;
    color: var(--text-primary);
}

.flip-card-back p {
    font-size: 13px;
    color: var(--text-secondary);
    font-family: var(--font-primary);
    line-height: 1.5;
    margin: 0 0 12px 0;
}

.flip-card-back .read-more {
    display: inline-block;
    padding: 6px 18px;
    background: var(--gold);
    color: var(--text-white);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    font-family: var(--font-secondary);
    border: none;
}

.flip-card-back .read-more:hover {
    background: var(--gold-dark);
    transform: scale(1.05);
    color: var(--text-white);
}

/* Flip card hover effect */
.flip-card:not(.flipped):hover .flip-card-inner {
    transform: rotateY(8deg);
    transition: transform 0.3s ease;
}

/* ============================================
   BOOK STATUS
   ============================================ */

.book-status {
    background: var(--bg-book-pages);
    border-radius: 10px;
    padding: 20px 25px;
    margin-top: 25px;
    border: 1px solid var(--border-light);
    box-shadow: 0 2px 8px var(--shadow-light);
}

.book-status h3 {
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 18px;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border-light);
}

.book-status h3 i {
    color: var(--gold);
    margin-right: 8px;
}

.status-item {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-secondary);
    color: var(--text-primary);
    font-size: 14px;
}

.status-item:last-child {
    border-bottom: none;
}

.status-item i {
    color: var(--silver);
    width: 20px;
    margin-right: 8px;
}

.status-badge {
    padding: 3px 14px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
}

.status-badge.success {
    background: #e8f5e9;
    color: #2e7d32;
}

.status-badge.warning {
    background: #fff8e1;
    color: #f57f17;
}

.status-badge.error {
    background: #fce4ec;
    color: #c62828;
}

/* ============================================
   BOOK FOOTER
   ============================================ */

.book-footer {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 2px solid var(--border-light);
    color: var(--text-secondary);
    font-family: var(--font-primary);
    font-size: 14px;
}

.book-footer i {
    color: var(--gold);
    margin: 0 5px;
}

/* ============================================
   DEBUG INFO
   ============================================ */

.debug-info {
    background: var(--bg-book-pages);
    border-radius: 10px;
    padding: 18px 22px;
    margin-top: 25px;
    border: 1px solid var(--border-light);
    font-size: 13px;
    font-family: var(--font-secondary);
    color: var(--text-secondary);
}

.debug-info h4 {
    color: var(--text-primary);
    font-family: var(--font-primary);
    margin-bottom: 12px;
    font-size: 16px;
}

.debug-info h4 i {
    color: var(--gold);
    margin-right: 8px;
}

.debug-info p {
    margin: 4px 0;
    font-size: 13px;
}

.debug-info code {
    background: var(--bg-card-back);
    padding: 2px 8px;
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 12px;
    border: 1px solid var(--border-light);
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
    .book-pages {
        padding: 20px;
    }
    
    .page-title h1 {
        font-size: 30px;
    }
    
    .flip-grid {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
        gap: 18px;
    }
    
    .flip-card {
        height: 220px;
    }
    
    .flip-card-front i {
        font-size: 34px;
    }
    
    .flip-card-front h3 {
        font-size: 17px;
    }
    
    .flip-card-back i {
        font-size: 24px;
    }
    
    .flip-card-back h4 {
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .book-cover {
        padding: 12px;
    }
    
    .book-pages {
        padding: 15px;
    }
    
    .page-title h1 {
        font-size: 24px;
    }
    
    .page-title p {
        font-size: 14px;
    }
    
    .flip-grid {
        grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
        gap: 12px;
    }
    
    .flip-card {
        height: 190px;
    }
    
    .flip-card-front {
        padding: 15px;
    }
    
    .flip-card-front i {
        font-size: 28px;
        margin-bottom: 8px;
    }
    
    .flip-card-front h3 {
        font-size: 15px;
        margin-bottom: 4px;
    }
    
    .flip-card-front p {
        font-size: 11px;
    }
    
    .flip-card-back {
        padding: 15px;
    }
    
    .flip-card-back i {
        font-size: 20px;
        margin-bottom: 8px;
    }
    
    .flip-card-back h4 {
        font-size: 14px;
        margin-bottom: 4px;
    }
    
    .flip-card-back p {
        font-size: 11px;
        margin-bottom: 8px;
    }
    
    .flip-card-back .read-more {
        font-size: 11px;
        padding: 4px 14px;
    }
    
    .book-status {
        padding: 15px;
    }
    
    .status-item {
        font-size: 12px;
        padding: 6px 0;
    }
    
    .chapter-divider {
        font-size: 11px;
        margin: 20px 0 15px;
    }
    
    .chapter-divider::before,
    .chapter-divider::after {
        margin: 0 8px;
    }
}

/* ============================================
   BOOKMARK TABS - For Product/Project/Service Pages
   ============================================ */

/* Bookmark Container */
.bookmark-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0;
    margin: 20px 0 30px;
    padding-left: 20px;
    position: relative;
}

/* Individual Bookmark */
.bookmark-tab {
    position: relative;
    padding: 12px 28px 10px 28px;
    background: var(--bg-card-front, #ffffff);
    border: 1px solid var(--border-light, #e8e8e8);
    border-bottom: none;
    border-radius: 8px 8px 0 0;
    font-family: var(--font-primary, 'Georgia', serif);
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary, #555555);
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    margin-right: -1px;
    box-shadow: 0 -2px 8px var(--shadow-light, rgba(0,0,0,0.04));
}

/* Bookmark Triangle/Flag at Bottom */
.bookmark-tab::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-top: 10px solid var(--bg-card-front, #ffffff);
    opacity: 0;
    transition: all 0.3s ease;
}

/* Bookmark Active State */
.bookmark-tab.active {
    background: var(--gold, #c9a84c);
    color: #ffffff;
    border-color: var(--gold, #c9a84c);
    box-shadow: 0 -4px 15px rgba(201, 168, 76, 0.2);
    z-index: 2;
}

.bookmark-tab.active::after {
    opacity: 1;
    border-top-color: var(--gold, #c9a84c);
}

/* Bookmark Hover */
.bookmark-tab:hover:not(.active) {
    background: var(--gold-light, #e8d5a3);
    border-color: var(--gold, #c9a84c);
    color: var(--text-primary, #1a1a1a);
    transform: translateY(-2px);
}

.bookmark-tab:hover:not(.active)::after {
    opacity: 0.5;
    border-top-color: var(--gold-light, #e8d5a3);
}

/* Bookmark Icons */
.bookmark-tab i {
    margin-right: 8px;
    font-size: 14px;
}

/* Bookmark Active Icon Color */
.bookmark-tab.active i {
    color: #ffffff;
}

/* ============================================
   BOOKMARK CONTENT - The pages behind bookmarks
   ============================================ */

.bookmark-content {
    background: var(--bg-card-front, #ffffff);
    border: 1px solid var(--border-light, #e8e8e8);
    border-radius: 0 8px 8px 8px;
    padding: 30px;
    margin-top: 0;
    box-shadow: 0 4px 20px var(--shadow-light, rgba(0,0,0,0.04));
    min-height: 300px;
}

/* Bookmark Content with top border (when first tab active) */
.bookmark-content .bookmark-page-title {
    font-family: var(--font-primary, 'Georgia', serif);
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary, #1a1a1a);
    margin-bottom: 10px;
}

.bookmark-content .bookmark-page-title span {
    color: var(--gold, #c9a84c);
}

.bookmark-content .bookmark-page-subtitle {
    font-size: 15px;
    color: var(--text-secondary, #555555);
    font-family: var(--font-primary, 'Georgia', serif);
    font-style: italic;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-light, #e8e8e8);
}

/* ============================================
   PRODUCT GRID - Inside Bookmark Content
   ============================================ */

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 25px;
}

/* Product Card */
.product-card {
    background: var(--bg-book-pages, #ffffff);
    border: 1px solid var(--border-light, #e8e8e8);
    border-radius: 8px;
    padding: 15px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px var(--shadow-light, rgba(0,0,0,0.04));
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px var(--shadow-medium, rgba(0,0,0,0.08));
    border-color: var(--gold, #c9a84c);
}

.product-card .product-image {
    width: 100%;
    height: 160px;
    object-fit: cover;
    border-radius: 6px;
    background: var(--bg-card-back, #f5f5f5);
}

.product-card .product-name {
    font-family: var(--font-primary, 'Georgia', serif);
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary, #1a1a1a);
    margin: 12px 0 5px;
}

.product-card .product-name span {
    color: var(--gold, #c9a84c);
}

.product-card .product-description {
    font-size: 13px;
    color: var(--text-secondary, #555555);
    font-family: var(--font-secondary, 'Segoe UI', sans-serif);
    margin-bottom: 12px;
    line-height: 1.5;
}

.product-card .product-link {
    display: inline-block;
    padding: 6px 20px;
    background: var(--gold, #c9a84c);
    color: #ffffff;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    font-family: var(--font-secondary, 'Segoe UI', sans-serif);
}

.product-card .product-link:hover {
    background: var(--gold-dark, #a8893a);
    transform: scale(1.05);
}

/* ============================================
   BOOKMARK RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
    .bookmark-tabs {
        padding-left: 10px;
        gap: 4px;
    }
    
    .bookmark-tab {
        padding: 10px 16px 8px 16px;
        font-size: 12px;
        border-radius: 6px 6px 0 0;
    }
    
    .bookmark-tab i {
        margin-right: 5px;
        font-size: 12px;
    }
    
    .bookmark-content {
        padding: 20px;
        border-radius: 0 6px 6px 6px;
    }
    
    .bookmark-content .bookmark-page-title {
        font-size: 20px;
    }
    
    .product-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 15px;
    }
    
    .product-card .product-image {
        height: 120px;
    }
}

@media (max-width: 480px) {
    .bookmark-tabs {
        padding-left: 5px;
        gap: 2px;
    }
    
    .bookmark-tab {
        padding: 8px 12px 6px 12px;
        font-size: 11px;
        border-radius: 4px 4px 0 0;
    }
    
    .bookmark-tab i {
        margin-right: 3px;
        font-size: 10px;
    }
    
    .bookmark-tab::after {
        bottom: -6px;
        border-left-width: 5px;
        border-right-width: 5px;
        border-top-width: 6px;
    }
    
    .bookmark-content {
        padding: 15px;
        border-radius: 0 4px 4px 4px;
    }
    
    .bookmark-content .bookmark-page-title {
        font-size: 17px;
    }
    
    .bookmark-content .bookmark-page-subtitle {
        font-size: 13px;
    }
    
    .product-grid {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }
    
    .product-card {
        padding: 10px;
    }
    
    .product-card .product-image {
        height: 100px;
    }
    
    .product-card .product-name {
        font-size: 13px;
        margin: 8px 0 3px;
    }
    
    .product-card .product-description {
        font-size: 11px;
        margin-bottom: 8px;
    }
    
    .product-card .product-link {
        font-size: 10px;
        padding: 4px 14px;
    }
}

/* ============================================
   SPECIAL: GOLD BOOKMARK (for active gold theme)
   ============================================ */

.bookmark-tab.gold {
    background: var(--gold, #c9a84c);
    color: #ffffff;
    border-color: var(--gold, #c9a84c);
}

.bookmark-tab.gold::after {
    opacity: 1;
    border-top-color: var(--gold, #c9a84c);
}

.bookmark-tab.gold:hover {
    background: var(--gold-dark, #a8893a);
    border-color: var(--gold-dark, #a8893a);
}