:root {
    --bg-primary: #fcfaf2; /* Màu kem/giấy da ấm áp cổ điển */
    --bg-secondary: #f3eee3; /* Màu xám kem đậm hơn một chút để tạo độ sâu */
    --bg-glass: rgba(255, 255, 255, 0.85);
    --border-glass: rgba(0, 0, 0, 0.08);
    --accent-primary: #15803d; /* Màu xanh lá cây rừng cổ điển */
    --accent-secondary: #166534;
    --accent-glow: rgba(21, 128, 61, 0.12);
    
    --text-primary: #1e293b; /* Chữ màu slate đậm */
    --text-secondary: #475569;
    --text-muted: #64748b;
    
    --male-color: #0284c7; /* Xanh dương cho Nam */
    --male-bg: rgba(2, 132, 199, 0.06);
    --female-color: #db2777; /* Hồng cho Nữ */
    --female-bg: rgba(219, 39, 119, 0.06);
    
    --shadow-premium: 0 10px 30px -10px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.05);
    --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--font-sans);
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
}

/* App Layout */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Header styling */
.app-header {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-glass);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 10;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
}

.brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    box-shadow: 0 4px 12px rgba(21, 128, 61, 0.2);
}

.brand h1 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--accent-secondary);
}

.brand .subtitle {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Controls */
.controls-wrapper {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.search-box {
    position: relative;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.search-box input {
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--border-glass);
    border-radius: 9999px;
    padding: 0.6rem 1rem 0.6rem 2.5rem;
    color: var(--text-primary);
    outline: none;
    width: 240px;
    transition: all 0.3s ease;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.05);
}

.search-box input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 10px var(--accent-glow), inset 0 1px 2px rgba(0,0,0,0.05);
    width: 300px;
}

.filters {
    display: flex;
    gap: 1rem;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.filter-group label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    font-weight: 600;
}

.filter-group select {
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--border-glass);
    border-radius: 8px;
    padding: 0.4rem 1.5rem 0.4rem 0.75rem;
    color: var(--text-primary);
    outline: none;
    cursor: pointer;
    font-size: 0.85rem;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.filter-group select:focus {
    border-color: var(--accent-primary);
}

/* Buttons */
.btn {
    border: none;
    border-radius: 8px;
    padding: 0.5rem 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--accent-primary);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-secondary);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.8);
    color: var(--text-primary);
    border: 1px solid var(--border-glass);
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.btn-secondary:hover {
    background: rgba(0, 0, 0, 0.03);
}

#config-btn {
    height: 38px;
    width: 38px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    padding: 0;
}

/* Tree Viewport */
.tree-viewport {
    flex: 1;
    position: relative;
    overflow: hidden;
    background-color: var(--bg-primary);
    background-image: 
        radial-gradient(rgba(0, 0, 0, 0.05) 1px, transparent 1px),
        radial-gradient(rgba(0, 0, 0, 0.05) 1px, transparent 1px);
    background-size: 40px 40px;
    background-position: 0 0, 20px 20px;
    cursor: grab;
}

.tree-viewport:active {
    cursor: grabbing;
}

/* Zoom Controls */
.zoom-controls {
    position: absolute;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 5;
}

.zoom-controls button {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-premium);
    transition: all 0.2s ease;
}

.zoom-controls button:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
    transform: scale(1.05);
}

.drag-hint {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    padding: 0.6rem 1.2rem;
    border-radius: 9999px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    pointer-events: none;
    border: 1px solid var(--border-glass);
    box-shadow: var(--shadow-premium);
}

/* Canvas styling */
.tree-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 5000px;
    height: 5000px;
    transform-origin: 0 0;
    user-select: none;
}

.tree-svg-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.tree-svg-layer path {
    fill: none;
    stroke: #bbf7d0; /* Muted green connector lines */
    stroke-width: 3px;
    stroke-dasharray: 4, 4;
    transition: stroke 0.3s;
}

.tree-svg-layer path.spouse-line {
    stroke: var(--accent-primary);
    stroke-dasharray: none;
    stroke-width: 2px;
}

.tree-nodes-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
}

/* Spouses container to align them horizontally */
.spouse-couple {
    display: flex;
    gap: 16px;
    position: absolute;
    transform: translate(-50%, -50%);
    background: rgba(21, 128, 61, 0.03);
    border: 1px dashed rgba(21, 128, 61, 0.2);
    border-radius: 16px;
    padding: 10px;
}

/* Member Cards */
.member-card {
    width: 200px;
    height: 110px;
    background: white;
    border: 1.5px solid #e2e8f0;
    border-radius: 12px;
    padding: 0.8rem;
    cursor: pointer;
    position: absolute;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
}

.spouse-couple .member-card {
    position: relative;
    transform: none;
    top: auto;
    left: auto;
}

.member-card:hover {
    transform: translate(-50%, -55%) scale(1.05);
    border-color: var(--accent-primary);
    box-shadow: 0 12px 20px -8px var(--accent-glow), 0 4px 20px rgba(0,0,0,0.08);
}

.spouse-couple .member-card:hover {
    transform: translateY(-5px) scale(1.05);
}

.member-card.male {
    border-left: 5px solid var(--male-color);
    background: linear-gradient(to right, var(--male-bg) 0%, white 100%);
}

.member-card.female {
    border-left: 5px solid var(--female-color);
    background: linear-gradient(to right, var(--female-bg) 0%, white 100%);
}

.member-card.deceased {
    opacity: 0.75;
    background: #f8fafc;
}

.member-card.deceased::after {
    content: '✝';
    position: absolute;
    top: 5px;
    right: 8px;
    color: var(--text-muted);
    font-size: 0.8rem;
}

.card-generation {
    font-size: 0.65rem;
    color: var(--text-muted);
    font-weight: 600;
}

.card-name {
    font-size: 0.95rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin: 0.2rem 0;
}

.member-card.male .card-name {
    color: #0f172a;
}

.member-card.female .card-name {
    color: #0f172a;
}

.card-life {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.7rem;
    color: var(--text-muted);
}

.card-relation-badge {
    background: rgba(0,0,0,0.04);
    padding: 2px 6px;
    border-radius: 4px;
}

/* Highlighted search target */
.member-card.highlighted {
    border-color: var(--accent-primary) !important;
    box-shadow: 0 0 25px rgba(21, 128, 61, 0.4) !important;
    animation: pulse 1.5s infinite alternate;
}

@keyframes pulse {
    0% { transform: scale(1) translate(-50%, -50%); }
    100% { transform: scale(1.08) translate(-50%, -50%); }
}

.spouse-couple .member-card.highlighted {
    animation: pulse-spouse 1.5s infinite alternate;
}

@keyframes pulse-spouse {
    0% { transform: scale(1); }
    100% { transform: scale(1.08); }
}

/* Detail Drawer (Slide out) */
.detail-drawer {
    position: fixed;
    top: 0;
    right: -420px;
    width: 400px;
    height: 100vh;
    background: white;
    border-left: 1px solid var(--border-glass);
    box-shadow: -10px 0 30px rgba(0,0,0,0.05);
    z-index: 100;
    transition: right 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    flex-direction: column;
}

.detail-drawer.open {
    right: 0;
}

.drawer-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-glass);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.drawer-header h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--accent-secondary);
}

.close-drawer {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
}

.close-drawer:hover {
    color: var(--text-primary);
}

.drawer-body {
    padding: 1.5rem;
    overflow-y: auto;
    flex: 1;
}

.drawer-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.3);
    z-index: 99;
    display: none;
    backdrop-filter: blur(4px);
}

.drawer-overlay.open {
    display: block;
}

/* Detail Info Styles */
.detail-avatar-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 2rem;
    text-align: center;
}

.detail-avatar {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    border: 3px solid white;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.detail-avatar.male {
    color: var(--male-color);
    background: var(--male-bg);
}

.detail-avatar.female {
    color: var(--female-color);
    background: var(--female-bg);
}

.detail-name {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
}

.detail-gen-tag {
    font-size: 0.8rem;
    background: var(--bg-secondary);
    padding: 4px 10px;
    border-radius: 9999px;
    margin-top: 0.5rem;
    color: var(--text-secondary);
}

.info-grid {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.info-item {
    background: white;
    border: 1px solid var(--border-glass);
    border-radius: 8px;
    padding: 0.8rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

.info-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    font-weight: 600;
    margin-bottom: 0.3rem;
}

.info-value {
    font-size: 0.95rem;
    color: var(--text-primary);
}

/* Clickable relationships */
.relation-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--accent-primary);
    cursor: pointer;
    font-weight: 500;
    transition: color 0.2s;
    background: none;
    border: none;
    padding: 0;
    font-size: 0.95rem;
    text-align: left;
}

.relation-link:hover {
    color: var(--accent-secondary);
    text-decoration: underline;
}

.relation-list {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0,0,0,0.4);
    z-index: 200;
    display: none;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.modal.open {
    display: flex;
}

.modal-content {
    background: white;
    border: 1px solid var(--border-glass);
    border-radius: 16px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1);
    overflow: hidden;
}

.modal-header {
    padding: 1.2rem 1.5rem;
    border-bottom: 1px solid var(--border-glass);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.close-modal {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
}

.modal-body {
    padding: 1.5rem;
}

.form-group {
    margin-bottom: 1.2rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.form-control {
    width: 100%;
    background: #f8fafc;
    border: 1px solid var(--border-glass);
    border-radius: 8px;
    padding: 0.6rem 0.8rem;
    color: var(--text-primary);
    outline: none;
}

.form-control:focus {
    border-color: var(--accent-primary);
}

.help-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.3rem;
    display: block;
}

.modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-glass);
    display: flex;
    justify-content: flex-end;
}

/* -------------------------------------------------------------------------- */
/* Responsive Design & Mobile Optimizations                                   */
/* -------------------------------------------------------------------------- */

@media (max-width: 1024px) {
    .app-header {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
        align-items: stretch;
    }
    
    .controls-wrapper {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }
    
    .search-box input {
        width: 100%;
    }
    
    .search-box input:focus {
        width: 100%;
    }
    
    .filters {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.5rem;
    }
    
    .filter-group select {
        width: 100%;
    }
}

@media (max-width: 768px) {
    .detail-drawer {
        width: 100%;
        right: -100%;
    }
    
    .zoom-controls {
        bottom: 1rem;
        right: 1rem;
    }
    
    .zoom-controls button {
        width: 38px;
        height: 38px;
        font-size: 0.95rem;
    }
    
    .drag-hint {
        width: 90%;
        text-align: center;
        bottom: 1rem;
        font-size: 0.7rem;
        padding: 0.5rem 1rem;
    }
    
    /* Slightly scale down nodes on small mobile screens */
    .member-card {
        width: 180px;
        height: 105px;
        padding: 0.6rem;
    }
    
    .card-name {
        font-size: 0.85rem;
    }
    
    .spouse-couple {
        gap: 10px;
        padding: 6px;
    }
}