:root {
    --primary-color: #6a0dad; /* Purple */
    --secondary-color: #9370db; /* Medium Purple */
    --light-purple: #e6e6fa; /* Lavender */
    --dark-purple: #4b0082; /* Indigo */
    --text-color: #333;
    --light-text: #fff;
    --border-color: #ddd;
    --light-bg: #f9f9f9;
    --hover-bg: #eee;
    --disabled-bg: #cccccc;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Basic Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; /* Modern font stack */
    line-height: 1.6;
    color: var(--text-color);
    background-color: #fff; /* White background */
    padding-top: 80px; /* Space for fixed header */
}

header {
    background-color: var(--primary-color);
    color: var(--light-text);
    padding: 1rem 0;
    text-align: center;
    position: fixed; /* Fixed header */
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: var(--shadow);
}

header h1 {
    margin: 0;
    font-size: 2rem;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
}

nav ul {
    list-style: none;
    padding: 10px 0 0 0;
    margin: 0;
    box-shadow: var(--shadow);
}

nav ul li {
    display: inline;
    margin: 0 15px;
}

nav a {
    text-decoration: none;
    color: var(--light-purple);
    font-weight: 500;
    transition: color 0.3s ease;
}

nav a:hover, nav a.active {
    color: var(--light-text);
    text-decoration: none;
}

main {
    max-width: 1100px; /* Wider max-width */
    margin: 40px auto; /* More space from header */
    padding: 30px;
    background-color: #fff;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

main h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
    text-align: center;
    font-size: 1.8rem;
}

main h3 {
    color: var(--secondary-color);
    margin-bottom: 15px;
    font-size: 1.4rem;
    border-bottom: 2px solid var(--light-purple);
    padding-bottom: 5px;
}

main h4 {
    color: var(--dark-purple);
    margin-bottom: 10px;
}

.button, button {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--light-text);
    padding: 12px 25px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    margin: 5px;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
    box-shadow: var(--shadow);
}

.button:hover, button:hover:not(:disabled) {
    background-color: var(--dark-purple);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.button:disabled, button:disabled {
    background-color: var(--disabled-bg);
    cursor: not-allowed;
    box-shadow: none;
}

.cta-buttons {
    margin-top: 30px;
    text-align: center;
}

/* Forms */
form {
    margin-top: 20px;
    min-height: 100px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: var(--secondary-color);
}

input[type="text"],
input[type="email"],
input[type="file"],
textarea,
select {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
}

input[type="checkbox"], input[type="radio"] {
    margin-right: 8px;
}

input[type="range"] {
    width: 80%;
    cursor: pointer;
}

textarea {
    resize: vertical;
    min-height: 100px;
}

/* Build Page Specific */
.section-options, .current-mix, .constructor-link, .notebook-config {
    margin-bottom: 25px;
    padding: 20px;
    border: 1px solid var(--light-purple);
    border-radius: 5px;
    background-color: var(--light-bg);
}

.section-cards {
    display: flex;
    flex-wrap: wrap; /* Allow wrapping on smaller screens */
    gap: 15px;
    margin-bottom: 15px;
}

.card {
    border: 2px solid transparent; /* Start transparent for selection effect */
    padding: 15px;
    cursor: pointer;
    background-color: #fff;
    border-radius: 5px;
    box-shadow: var(--shadow);
    transition: border-color 0.3s ease, transform 0.2s ease;
    text-align: center;
    min-width: 100px;
}

.card:hover {
    background-color: var(--hover-bg);
    transform: translateY(-2px);
}

.card.selected {
    border-color: var(--secondary-color);
    background-color: var(--light-purple);
}

#mix-container {
    min-height: 60px;
    border: 1px solid var(--border-color);
    padding: 15px;
    background-color: #fff;
    border-radius: 5px;
    margin-bottom: 10px;
}

#mix-container div {
    padding: 5px 0;
    border-bottom: 1px dotted var(--light-purple);
}
#mix-container div:last-child {
    border-bottom: none;
}

/* Constructor Page Specific */
.constructor-main {
    max-width: 1200px;
    position: relative; /* Needed if using absolute positioning for window */
}

/* Floating Preview Window Styles */
.floating-window {
    position: fixed; /* Float over everything, stay in viewport */
    right: 20px;     /* Initial position */
    top: 100px;    /* Initial position (below header) */
    width: 50%;    /* Initial size */
    max-width: 700px;
    min-width: 350px;
    z-index: 1001; /* Above header */
    background-color: var(--light-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    overflow: auto;     /* Allow scrolling if content overflows, needed for resize handle */
    resize: both;     /* Allow user resizing (basic) */
    min-height: 300px; /* Prevent resizing too small */
    display: flex;
    flex-direction: column;
}

.window-header {
    background-color: var(--secondary-color);
    color: var(--light-text);
    padding: 8px 15px;
    cursor: move; /* Indicate draggable */
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.window-header span {
    font-weight: bold;
}

.window-controls .window-btn {
    background: none;
    border: none;
    color: var(--light-text);
    font-size: 1.1rem;
    font-weight: bold;
    padding: 2px 8px;
    cursor: pointer;
    margin-left: 5px;
    line-height: 1;
    box-shadow: none;
}

.window-controls .window-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}

/* Adjust preview content area */
#notebook-preview.preview-content {
    flex-grow: 1;
    min-height: 300px;
    background-color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    font-style: italic;
    color: var(--disabled-bg);
    border: 1px dashed var(--secondary-color);
    border-radius: 5px;
    position: relative;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    margin: 10px;
    padding: 10px;
    box-sizing: border-box;
}

#preview-cover-layer {
    /* Styles set inline for toggling */
    /* Example texture placeholders */
}

#preview-cover-layer.leather {
    background-color: #8B4513; /* Brown */
    /* Add texture image later */
}
#preview-cover-layer.wood {
    background-color: #DEB887; /* BurlyWood */
    /* Add texture image later */
}

/* Ensure layers are contained within the padding */
#preview-image-layer {
    position: absolute;
    top: 0; /* Cover the entire parent */
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    /* opacity set by JS */
    pointer-events: none; /* Allow clicks through to page content if needed */
}

/* Style the container for page content */
#preview-page-content {
    width: 100%;
    height: 100%;
    position: relative; /* Already set inline, but good practice */
    overflow: hidden;   /* Clip inserts/diary header if they go outside bounds */
}

/* Style the placeholder text */
#preview-page-content > p {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--disabled-bg);
    font-style: italic;
    text-align: center;
    padding: 10px;
    display: block; /* Initially visible */
}

/* Controls Pane Wrapper - takes up space on the page */
.controls-pane-wrapper {
    max-width: 450px; /* Adjust width as needed */
    margin-right: auto; /* Keep controls to the left */
    /* Or use margin: 0 auto; to center if preferred */
}

.controls-pane {
    /* Removed flex properties as it's no longer side-by-side */
    border: 1px solid var(--border-color);
    padding: 20px;
    border-radius: 8px;
    background-color: #fff;
    min-width: 280px;
}

.control-group {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--light-purple);
}
.control-group:last-of-type {
    border-bottom: none;
}

.color-picker-wrapper label {
    display: inline-block;
    margin-right: 10px;
}

input[type="color"] {
    vertical-align: middle;
    margin-left: 5px;
    cursor: pointer;
    width: 40px;
    height: 30px;
    border: none;
    padding: 0;
}

/* Placeholders for Drag and Drop */
.droppable-area {
    border: 2px dashed var(--secondary-color);
    min-height: 100px;
    padding: 10px;
    margin-top: 10px;
    border-radius: 5px;
    text-align: center;
    color: var(--disabled-bg);
}

.draggable-item {
    padding: 8px 12px;
    background-color: var(--secondary-color);
    color: var(--light-text);
    border-radius: 4px;
    margin: 5px;
    cursor: grab;
    display: inline-block;
}

footer {
    background-color: var(--dark-purple);
    color: var(--light-purple);
    padding: 1.5rem 0;
    text-align: center;
    margin-top: 50px;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    body {
        padding-top: 120px; /* Adjust for potentially taller header */
    }
    nav ul li {
        margin: 0 8px;
    }
    main {
        padding: 20px;
        margin: 20px auto;
    }
    .constructor-interface {
        flex-direction: column;
    }
    .preview-pane, .controls-pane {
        flex: none; /* Remove flex sizing */
        width: 100%; /* Stack vertically */
    }
}

/* Cart Item Styling */
.cart-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--light-purple);
    padding: 15px 0;
    margin-bottom: 10px;
}

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

.cart-item-details {
    flex-grow: 1;
    margin-right: 15px;
}

.cart-item-details h4 {
    margin-bottom: 5px;
    color: var(--primary-color);
}

.cart-item-details ul {
    list-style: none;
    padding-left: 0;
    font-size: 0.9em;
    color: #555;
}

.cart-item-price {
    font-weight: bold;
    color: var(--dark-purple);
    min-width: 60px;
    text-align: right;
    margin-right: 15px;
}

.cart-item-remove button {
    background-color: #dc3545;
    color: white;
    padding: 5px 10px;
    font-size: 0.9em;
    box-shadow: none;
}

.cart-item-remove button:hover {
    background-color: #c82333;
}

/* Homepage Specific */
.hero-section {
    text-align: center;
    padding: 40px 20px;
    background-color: var(--light-bg);
    border-radius: 8px;
    margin-bottom: 30px;
}

.notebook-photos {
    margin: 20px 0;
}

.notebook-photos img {
    max-width: 45%;
    height: auto;
    border-radius: 5px;
    margin: 5px;
    box-shadow: var(--shadow);
}

.feedback-display-section {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--light-purple);
}

.feedback-carousel {
    display: flex;
    gap: 20px;
    overflow-x: auto; /* Basic horizontal scroll for now */
    padding: 20px;
    /* TODO: Add animation for spinning */
    min-height: 150px; /* Ensure space is visible */
    align-items: center;
    justify-content: flex-start; /* Start cards from left */
    border: 1px solid var(--border-color);
    background-color: var(--light-bg);
    border-radius: 5px;
}

.feedback-card {
    background-color: #fff;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    min-width: 250px;
    max-width: 300px;
    box-shadow: var(--shadow);
    flex-shrink: 0; /* Prevent cards from shrinking */
     /* Add animation properties later */
    /* animation: spin 20s linear infinite; */
}

.feedback-card .stars {
    color: #f8d64e; /* Gold color for stars */
    font-size: 1.2em;
    margin-bottom: 10px;
}

.feedback-card p {
    font-style: italic;
    margin-bottom: 10px;
    color: #555;
}

.feedback-card span {
    font-size: 0.9em;
    color: var(--secondary-color);
    font-weight: bold;
}

/* Basic Spinning Animation (Example - can be improved) */
@keyframes spin {
    from { transform: translateX(0); }
    /* Move cards - adjust based on number/width */
    to { transform: translateX(-800px); } 
}

/* Star Rating Input */
.star-rating {
    display: inline-block;
    direction: rtl; /* Right to left to make hover/selection work nicely */
    font-size: 2em; /* Adjust size */
    margin-bottom: 10px;
}
.star-rating input[type=radio] {
    display: none;
}
.star-rating label {
    color: #ccc;
    cursor: pointer;
    display: inline-block; /* Reset display */
    padding: 0 0.1em;
    transition: color 0.2s ease-in-out;
    margin: 0;
}
.star-rating label:hover,
.star-rating label:hover ~ label, /* Color preceding stars on hover */
.star-rating input[type=radio]:checked ~ label /* Color selected and preceding stars */
{
    color: #f8d64e; /* Gold */
}

/* View Toggle Buttons */
.view-toggle-btn {
    background: none;
    border: 1px solid transparent;
    padding: 5px 15px;
    cursor: pointer;
    font-size: 0.9em;
    color: var(--secondary-color);
    border-radius: 4px;
    margin: 0 5px;
}

.view-toggle-btn.active {
    background-color: var(--secondary-color);
    color: var(--light-text);
    font-weight: bold;
}

.view-toggle-btn:not(.active):hover {
    background-color: #ddd;
}

/* Auth Forms */
.auth-form {
    max-width: 450px;
    margin: 30px auto;
    padding: 30px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--light-bg);
}

.form-group {
    margin-bottom: 20px;
}

.auth-form label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: var(--secondary-color);
}

.auth-form input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
}

.auth-form button {
    width: 100%;
    padding: 15px;
    font-size: 1.1rem;
}

.auth-switch {
    text-align: center;
    margin-top: 20px;
    font-size: 0.9em;
}

/* Profile Page */
#profile-info {
    margin-bottom: 20px;
}

#profile-info p {
    margin-bottom: 10px;
    font-size: 1.1em;
}

#profile-info strong {
    color: var(--primary-color);
}

#saved-designs-list {
    margin-top: 20px;
}

.saved-design-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    border: 1px solid var(--light-purple);
    border-radius: 5px;
    margin-bottom: 10px;
    background-color: #fff;
}

.saved-design-item span.design-details {
    flex-grow: 1;
    margin-right: 15px;
}

.saved-design-item span small {
     display: block;
     color: #666;
     margin-top: 3px;
}

.saved-design-item .design-actions {
    display: flex;
    gap: 10px;
    flex-shrink: 0; /* Prevent buttons from shrinking */
}

.saved-design-item .design-actions button {
    padding: 6px 12px;
    font-size: 0.9em;
}

.saved-design-item .design-actions .edit-name-btn {
    background: none;
    border: none;
    color: var(--secondary-color);
    font-size: 1.2em; /* Make icon slightly larger */
    padding: 0 5px;
    box-shadow: none;
}

.saved-design-item .design-actions .edit-name-btn:hover {
    color: var(--primary-color);
}

/* 3D Notebook Styles */
.notebook-3d-preview {
    perspective: 1200px;
    perspective-origin: 50% 200px;
}

.notebook-3d {
    width: 320px;
    height: 420px;
    margin: 30px auto;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.8s cubic-bezier(.4,2,.3,1), box-shadow 0.5s;
    box-shadow: 0 8px 32px rgba(0,0,0,0.18);
}

.notebook-3d.zoomed {
    transform: scale(1.15) rotateY(-60deg) translateX(60px);
    box-shadow: 0 16px 48px rgba(0,0,0,0.25);
}

.notebook-3d.open {
    transform: scale(1.15) rotateY(-120deg) translateX(120px);
}

.notebook-cover {
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    border-radius: 12px 12px 12px 12px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
    z-index: 3;
    backface-visibility: hidden;
    transition: background-image 0.4s, background-color 0.4s;
}

.notebook-spine {
    position: absolute;
    left: -16px;
    top: 0;
    width: 32px;
    height: 100%;
    background: linear-gradient(90deg, #bbb 60%, #888 100%);
    border-radius: 16px 0 0 16px;
    z-index: 2;
    box-shadow: 2px 0 8px rgba(0,0,0,0.10);
}

.notebook-pages {
    position: absolute;
    left: 12px;
    top: 10px;
    width: 92%;
    height: 95%;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    z-index: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s;
}

.notebook-3d.open .notebook-pages {
    opacity: 1;
    pointer-events: auto;
}

.notebook-3d.open .notebook-cover {
    opacity: 0.15;
}

/* Page List Builder Styles */
.page-list {
    list-style: none;
    padding: 0;
    margin: 0 0 10px 0;
    min-height: 40px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background: #f7f7f7;
    max-height: 180px;
    overflow-y: auto;
}
.page-list li {
    display: flex;
    align-items: center;
    padding: 6px 10px;
    margin: 2px 0;
    background: #fff;
    border: 1px solid #eee;
    border-radius: 4px;
    cursor: grab;
    transition: box-shadow 0.2s;
}
.page-list li.dragging {
    opacity: 0.5;
    box-shadow: 0 2px 8px rgba(0,0,0,0.12);
}
.page-list .page-type {
    flex: 1;
    font-weight: 500;
    color: var(--primary-color);
}
.page-list .remove-page-btn {
    background: #dc3545;
    color: #fff;
    border: none;
    border-radius: 3px;
    font-size: 1em;
    margin-left: 10px;
    cursor: pointer;
    padding: 2px 8px;
}
.page-list .remove-page-btn:hover {
    background: #b71c1c;
}
.add-page-row {
    display: flex;
    gap: 8px;
    margin-top: 8px;
}

/* 3D Notebook Two-Page Spread */
.notebook-3d.spread-view {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    width: 480px;
    height: 320px;
    perspective: 1200px;
    margin: 30px auto;
    background: #eaeaea;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.18);
    position: relative;
}
.notebook-spine {
    width: 18px;
    min-width: 18px;
    height: 90%;
    background: linear-gradient(90deg, #bbb 60%, #888 100%);
    border-radius: 12px;
    margin: 0 2px;
    z-index: 2;
}
.spread-pages {
    display: flex;
    flex-direction: row;
    width: 440px;
    height: 95%;
    align-items: center;
    justify-content: center;
    gap: 0;
}
.spread-page {
    width: 210px;
    height: 98%;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    margin: 0 2px;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: box-shadow 0.2s;
}
.spread-page .page-label {
    position: absolute;
    top: 6px;
    left: 10px;
    font-size: 0.85em;
    color: #888;
    background: rgba(255,255,255,0.7);
    padding: 1px 6px;
    border-radius: 4px;
    z-index: 2;
}
.spread-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    margin: 10px 0 0 0;
}
.spread-controls button {
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 1.2em;
    padding: 4px 16px;
    cursor: pointer;
    transition: background 0.2s;
}
.spread-controls button:disabled {
    background: #ccc;
    cursor: not-allowed;
}