/* CSS Variables for Light and Dark Themes */
:root {
    --bg-color: #f8f9fa;
    --text-color: #333;
    --text-muted: #666;
    --card-bg: #ffffff;
    --card-header-bg: #f8f9fa;
    --card-border: #e9ecef;
    --navbar-bg: #ffffff;
    --navbar-border: rgba(0,0,0,.1);
    --input-bg: #ffffff;
    --input-border: #ced4da;
    --input-focus-border: #667eea;
    --button-outline-border: #6c757d;
    --button-outline-color: #6c757d;
    --button-outline-hover-bg: #6c757d;
    --button-outline-hover-color: #ffffff;
    --hero-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --hero-text: #ffffff;
    --section-bg: #f8f9fa;
    --footer-bg: #343a40;
    --footer-text: #ffffff;
    --diagram-bg: #ffffff;
    --diagram-border: #e0e0e0;
    --loading-overlay-bg: rgba(255, 255, 255, 0.8);
    --image-input-bg: #f8f9fa;
    --image-input-border: #ccc;
    --image-input-dragover-bg: #e9ecef;
    --shadow-color: rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --text-muted: #a0a0a0;
    --card-bg: #2d2d2d;
    --card-header-bg: #3a3a3a;
    --card-border: #444444;
    --navbar-bg: #2d2d2d;
    --navbar-border: rgba(255,255,255,.1);
    --input-bg: #3a3a3a;
    --input-border: #555555;
    --input-focus-border: #667eea;
    --button-outline-border: #6c757d;
    --button-outline-color: #adb5bd;
    --button-outline-hover-bg: #6c757d;
    --button-outline-hover-color: #ffffff;
    --hero-bg: linear-gradient(135deg, #4a5568 0%, #2d3748 100%);
    --hero-text: #ffffff;
    --section-bg: #252525;
    --footer-bg: #1a1a1a;
    --footer-text: #e0e0e0;
    --diagram-bg: #2d2d2d;
    --diagram-border: #555555;
    --loading-overlay-bg: rgba(45, 45, 45, 0.9);
    --image-input-bg: #3a3a3a;
    --image-input-border: #555555;
    --image-input-dragover-bg: #4a4a4a;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; /* Modern font */
    background-color: var(--bg-color); /* Use CSS variable */
    padding-top: 56px; /* Adjust for fixed navbar */
    padding-bottom: 0; /* Footer will handle bottom spacing */
    color: var(--text-color); /* Use CSS variable */
    transition: background-color 0.3s ease, color 0.3s ease;
}

.navbar {
    box-shadow: 0 2px 4px var(--navbar-border);
    background-color: var(--navbar-bg) !important;
    transition: background-color 0.3s ease;
}

.navbar-brand {
    font-size: 1.5rem; /* Slightly larger brand name */
    color: var(--text-color) !important;
}

.nav-link {
    color: var(--text-color) !important;
}

.nav-link:hover {
    color: #667eea !important;
}

/* Theme toggle button styles */
.theme-toggle {
    border-color: var(--button-outline-border) !important;
    color: var(--button-outline-color) !important;
    background-color: transparent !important;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    background-color: var(--button-outline-hover-bg) !important;
    border-color: var(--button-outline-hover-bg) !important;
    color: var(--button-outline-hover-color) !important;
}

.navbar-toggler {
    border-color: var(--button-outline-border);
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%2833, 37, 41, 0.75%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

[data-theme="dark"] .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28224, 224, 224, 0.75%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

.hero-section {
    background: var(--hero-bg); /* Use CSS variable */
    color: var(--hero-text);
    padding: 60px 0; /* Increased padding */
    transition: background 0.3s ease;
}

.hero-section h1 {
    font-size: 2.8rem; /* Responsive font size */
    font-weight: 700;
}

.hero-section .lead {
    font-size: 1.2rem;
    margin-bottom: 30px;
}

.card {
    border: none; /* Remove default card border */
    border-radius: 0.5rem; /* Softer corners */
    box-shadow: 0 6px 12px var(--shadow-color); /* Use CSS variable */
    margin-bottom: 30px; /* Increased margin */
    background-color: var(--card-bg); /* Use CSS variable */
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.card-header {
    background-color: var(--card-header-bg); /* Use CSS variable */
    border-bottom: 1px solid var(--card-border); /* Use CSS variable */
    font-weight: 600;
    color: var(--text-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.card-body {
    background-color: var(--card-bg);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

#diagramContainer {
    background-color: var(--diagram-bg); /* Use CSS variable */
    border: 1px solid var(--diagram-border); /* Use CSS variable */
    border-radius: 0.25rem;
    transition: all 0.3s ease;
    min-height: 500px; /* Ensure it has some height even when empty */
    position: relative; /* Added for overlay positioning */
}

/* Styles for the new diagram loading overlay */
#diagramLoadingOverlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--loading-overlay-bg); /* Use CSS variable */
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 10; /* Ensure it's on top of the iframe */
    border-radius: 0.25rem; /* Match diagramContainer */
    transition: background-color 0.3s ease;
}

#diagramLoadingOverlay .spinner-border {
    width: 3rem;
    height: 3rem;
    color: #667eea;
}

#diagramLoadingOverlay p {
    margin-top: 15px;
    font-size: 1.1rem;
    color: var(--text-color); /* Use CSS variable */
    transition: color 0.3s ease;
}

/* Image Input Area Enhancements */
#image-input-area {
    transition: background-color 0.2s ease-in-out, border-color 0.2s ease-in-out;
    background-color: var(--image-input-bg) !important; /* Use CSS variable */
    border-color: var(--image-input-border) !important; /* Use CSS variable */
}

#image-input-area.dragover {
    background-color: var(--image-input-dragover-bg) !important; /* Use CSS variable */
    border-color: #667eea !important; /* Theme color for border */
}

#image-input-area label.btn-outline-primary {
    cursor: pointer;
}

#image-input-area .text-muted {
    color: var(--text-muted) !important; /* Use CSS variable */
}

/* Ensuring the preview container within the new dropzone doesn't take unnecessary space before image is loaded */
#imagePreviewContainer:not(:has(img:not(.d-none))) {
    min-height: 0; /* Collapse if no visible image */
}

/* Style for the new remove image button */
#imagePreviewWrapper {
    display: inline-block; /* Make wrapper shrink to image size */
    /* position: relative; is already applied by Bootstrap class 'position-relative' in HTML */
}

#removeImageBtn {
    /* Using Bootstrap position utilities (top-0 end-0) */
    /* Position the center of the button at the top-right corner of the wrapper */
    transform: translate(-50%, 50%); 
    z-index: 5; /* Ensure it's above the image */
    width: 28px; /* Custom size for the small circle */
    height: 28px;
    padding: 0; /* Reset padding to ensure icon centers well */
    display: flex; /* For centering icon */
    align-items: center; /* For centering icon */
    justify-content: center; /* For centering icon */
    line-height: 1; /* Ensure consistent line height */
}

#removeImageBtn i {
    /* vertical-align: middle; -- Not needed with flex centering */
    font-size: 0.8rem; /* Adjust icon size if necessary */
}

textarea.form-control {
    resize: vertical;
    min-height: 120px; /* Slightly taller */
    border-radius: 0.3rem;
    background-color: var(--input-bg); /* Use CSS variable */
    border-color: var(--input-border); /* Use CSS variable */
    color: var(--text-color); /* Use CSS variable */
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

textarea.form-control:focus {
    background-color: var(--input-bg);
    border-color: var(--input-focus-border);
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
    color: var(--text-color);
}

.form-control {
    background-color: var(--input-bg); /* Use CSS variable */
    border-color: var(--input-border); /* Use CSS variable */
    color: var(--text-color); /* Use CSS variable */
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

.form-control:focus {
    background-color: var(--input-bg);
    border-color: var(--input-focus-border);
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
    color: var(--text-color);
}

.form-label {
    color: var(--text-color); /* Use CSS variable */
    transition: color 0.3s ease;
}

.btn-primary {
    background-color: #667eea; /* Fliki-like purple */
    border-color: #667eea;
    padding: 0.75rem 1.5rem; /* Larger buttons */
    font-size: 1.1rem;
    font-weight: 500;
    border-radius: 0.3rem;
    transition: background-color 0.2s ease-in-out;
}

.btn-primary:hover {
    background-color: #5a6fd0; /* Darker shade on hover */
    border-color: #5a6fd0;
}

.btn-success {
    background-color: #28a745; /* Kept green for success */
    border-color: #28a745;
    padding: 0.75rem 1.5rem;
    font-size: 1.1rem;
    font-weight: 500;
    border-radius: 0.3rem;
    transition: background-color 0.2s ease-in-out;
}

.btn-success:hover {
    background-color: #218838;
    border-color: #1e7e34;
}

.how-it-works-section {
    padding: 60px 0;
    background-color: var(--section-bg) !important; /* Use CSS variable */
    transition: background-color 0.3s ease;
}

.how-it-works-section h2 {
    color: var(--text-color); /* Use CSS variable */
    margin-bottom: 50px;
    transition: color 0.3s ease;
}

.step-icon i {
    color: #667eea !important; /* Ensure icon color matches theme */
    margin-bottom: 1rem;
}

.how-it-works-section h4 {
    color: var(--text-color); /* Use CSS variable */
    font-weight: 600;
    margin-bottom: 0.5rem;
    transition: color 0.3s ease;
}

.how-it-works-section p {
    color: var(--text-muted); /* Use CSS variable */
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

.footer {
    background-color: var(--footer-bg); /* Use CSS variable */
    color: var(--footer-text); /* Use CSS variable */
    padding: 20px 0;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.footer p {
    margin-bottom: 0;
    color: var(--footer-text); /* Use CSS variable */
    transition: color 0.3s ease;
}

/* Make sure the main content area below hero has some top margin */
#generate.container {
    padding-top: 40px;
    padding-bottom: 40px;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 2.2rem;
    }
    .hero-section .lead {
        font-size: 1rem;
    }
    .how-it-works-section .col-md-3 {
        margin-bottom: 30px;
    }
    .navbar-nav .nav-link {
        padding-right: .5rem;
        padding-left: .5rem;
    }
}

/* Additional dark theme support for Bootstrap elements */
.alert {
    background-color: var(--card-bg);
    border-color: var(--card-border);
    color: var(--text-color);
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

.alert-danger {
    background-color: var(--card-bg);
    border-color: #dc3545;
    color: #dc3545;
}

[data-theme="dark"] .alert-danger {
    background-color: #2d1b1b;
    border-color: #dc3545;
    color: #f5c6cb;
}

.btn-outline-primary {
    color: #667eea;
    border-color: #667eea;
    background-color: transparent;
}

.btn-outline-primary:hover {
    color: #fff;
    background-color: #667eea;
    border-color: #667eea;
}

[data-theme="dark"] .btn-outline-primary {
    color: #667eea;
    border-color: #667eea;
}

[data-theme="dark"] .btn-outline-primary:hover {
    color: #fff;
    background-color: #667eea;
    border-color: #667eea;
}

/* Placeholder text styling */
::placeholder {
    color: var(--text-muted) !important;
    opacity: 0.7;
}

[data-theme="dark"] ::placeholder {
    color: var(--text-muted) !important;
    opacity: 0.8;
}

/* Smooth transitions for all interactive elements */
* {
    transition-property: background-color, border-color, color, box-shadow;
    transition-duration: 0.3s;
    transition-timing-function: ease;
}

/* Override for elements that shouldn't have transitions */
.spinner-border, .btn:active, .btn:focus {
    transition: none !important;
}

/* Prompt Editor Modal Styles */
.modal-xl {
    max-width: 90vw;
}

#promptEditorModal .modal-body {
    padding: 2rem;
}

#modalPromptTextarea {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 1rem;
    line-height: 1.6;
    resize: vertical;
    min-height: 400px;
    background-color: var(--input-bg);
    border-color: var(--input-border);
    color: var(--text-color);
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

#modalPromptTextarea:focus {
    background-color: var(--input-bg);
    border-color: var(--input-focus-border);
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
    color: var(--text-color);
    outline: none;
}

.modal-content {
    background-color: var(--card-bg);
    border-color: var(--card-border);
    color: var(--text-color);
}

.modal-header {
    background-color: var(--card-bg);
    border-bottom-color: var(--card-border);
    color: var(--text-color);
}

.modal-footer {
    background-color: var(--card-bg);
    border-top-color: var(--card-border);
    color: var(--text-color);
}

.modal-title {
    color: var(--text-color);
    font-weight: 600;
}

/* Expand button positioning */
#expandPromptBtn {
    z-index: 10;
    opacity: 0.7;
    transition: opacity 0.2s ease;
}

#expandPromptBtn:hover {
    opacity: 1;
}

/* Character count styling */
#charCount {
    font-weight: 600;
    color: var(--text-color);
}

/* Tips and supported types cards in modal */
#promptEditorModal .card {
    border-color: var(--card-border);
    background-color: var(--section-bg);
}

#promptEditorModal .card-body {
    background-color: var(--section-bg);
}

#promptEditorModal .card-title {
    color: var(--text-color);
    font-size: 0.95rem;
    font-weight: 600;
}

#promptEditorModal .card ul {
    color: var(--text-muted);
}

#promptEditorModal .card li {
    margin-bottom: 0.25rem;
}

/* Responsive adjustments for modal */
@media (max-width: 768px) {
    .modal-xl {
        max-width: 95vw;
    }
    
    #promptEditorModal .modal-body {
        padding: 1rem;
    }
    
    #modalPromptTextarea {
        min-height: 300px;
        font-size: 0.9rem;
    }
    
    #promptEditorModal .card-title {
        font-size: 0.9rem;
    }
    
    #promptEditorModal .small {
        font-size: 0.8rem;
    }
}

/* Diagram Editor Modal Styles */
.modal-fullscreen {
    width: 100vw;
    max-width: none;
    height: 100vh;
    margin: 0;
}

.modal-fullscreen .modal-content {
    height: 100vh;
    border: none;
    border-radius: 0;
}

#diagramEditorModal .modal-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--card-border);
}

#diagramEditorModal .modal-body {
    padding: 0;
    overflow: hidden;
}

#diagramEditorModal .modal-footer {
    padding: 0.75rem 1.5rem;
    border-top: 1px solid var(--card-border);
}

#modalDiagramContainer {
    background-color: var(--diagram-bg);
    transition: background-color 0.3s ease;
}

#modalDiagramLoadingOverlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--loading-overlay-bg);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 10;
    transition: background-color 0.3s ease;
}

#modalDiagramLoadingOverlay .spinner-border {
    width: 3rem;
    height: 3rem;
    color: #667eea;
}

#modalDiagramLoadingOverlay p {
    margin-top: 15px;
    font-size: 1.1rem;
    color: var(--text-color);
    transition: color 0.3s ease;
}

/* Expand diagram button styling */
#expandDiagramBtn {
    opacity: 0.8;
    transition: opacity 0.2s ease;
}

#expandDiagramBtn:hover {
    opacity: 1;
}

/* Download button in modal header */
#downloadFromModalBtn {
    font-size: 0.875rem;
}

/* Ensure modal appears above everything */
#diagramEditorModal {
    z-index: 1060;
}

/* Mobile adjustments for diagram modal */
@media (max-width: 768px) {
    #diagramEditorModal .modal-header {
        padding: 0.75rem 1rem;
    }
    
    #diagramEditorModal .modal-footer {
        padding: 0.5rem 1rem;
    }
    
    #diagramEditorModal .modal-title {
        font-size: 1rem;
    }
    
    #downloadFromModalBtn {
        font-size: 0.8rem;
        padding: 0.25rem 0.5rem;
    }
}