:root {
    --primary-color: #3f51b5; /* Indigo */
    --secondary-color: #64b5f6; /* Light Blue */
    --background-color: #f0f2f5; /* Lighter Grey */
    --text-color: #333333; /* Dark Grey */
    --card-bg: #ffffff; /* White */
    --input-bg: #fdfdfd; /* Slightly off-white for inputs */
    --border-color: #e0e0e0; /* Light Grey */
    --focus-border-color: #a7d9f7; /* Lighter blue for focus */
    --shadow-color: rgba(0, 0, 0, 0.08);
    --button-hover-color: #4b6ad2; /* Darker indigo for hover */
    --font-family: 'Cairo', sans-serif;
    --border-radius: 8px;
    --spacing-unit: 1rem;
}

/* Dark Mode Variables */
:root.dark-mode {
    --primary-color: #90CAF9; /* Light Blue for contrast */
    --secondary-color: #673AB7; /* Deep Purple */
    --background-color: #121212; /* Very Dark Grey */
    --text-color: #E0E0E0; /* Light Grey */
    --card-bg: #1E1E1E; /* Darker Grey */
    --input-bg: #2C2C2C; /* Dark Grey for inputs */
    --border-color: #444444; /* Darker border */
    --focus-border-color: #9CCC65; /* Greenish for focus */
    --shadow-color: rgba(0, 0, 0, 0.3);
    --button-hover-color: #5E35B1; /* Slightly lighter purple */
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: var(--spacing-unit); /* Responsive padding */
    text-align: center;
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s; /* Smooth transition for dark mode */
}

header {
    margin-bottom: calc(2 * var(--spacing-unit));
    padding: var(--spacing-unit) 0;
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 10px var(--shadow-color);
    transition: background-color 0.3s, box-shadow 0.3s;
}

h1 {
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: 0.5rem;
    font-size: 2.5rem;
}

header p {
    color: var(--text-color); /* Use text-color variable */
    font-size: 1.1rem;
    margin-bottom: 0;
}

.header-controls {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 1rem;
}

.control-btn {
    padding: 8px 15px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    font-family: var(--font-family);
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
}

.control-btn:hover {
    background-color: var(--button-hover-color);
    transform: translateY(-1px);
}

.form-container {
    max-width: 550px; /* Slightly wider for better desktop layout */
    margin: 0 auto calc(2 * var(--spacing-unit)) auto;
    background: var(--card-bg);
    padding: calc(2 * var(--spacing-unit));
    border-radius: var(--border-radius);
    box-shadow: 0 5px 20px var(--shadow-color);
    text-align: right; /* Align form content right for RTL */
    transition: background-color 0.3s, box-shadow 0.3s;
}

label {
    display: block; /* Ensure label takes full width for stacking */
    margin-bottom: 0; /* Reset margin from previous rules */
    font-weight: bold;
    color: var(--primary-color);
    text-align: right; /* Explicitly align label text */
    width: 100%; /* Make label take full width of its flex container */
}

input[type="color"], 
input[type="range"], 
input[type="file"], 
input[type="number"],
select, 
textarea {
    width: 100%;
    padding: 0.8rem 1rem; /* Increased padding for better touch targets */
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-family: var(--font-family);
    box-sizing: border-box;
    font-size: 1rem;
    background-color: var(--input-bg);
    color: var(--text-color);
    transition: border-color 0.3s, box-shadow 0.3s, background-color 0.3s, color 0.3s;
    -webkit-appearance: none; /* For selects to customize */
    -moz-appearance: none;
    appearance: none;
}

textarea {
    border: 2px solid var(--border-color); /* Darker and slightly thicker border for textarea */
}

select {
    padding-left: calc(0.8rem + 1.5rem); /* Space for dropdown arrow */
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%233f51b5' class='bi bi-chevron-down' viewBox='0 0 16 16'%3E%3Cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: left 1rem center; /* Position arrow on the left for RTL */
    background-size: 1rem;
}
/* Dark mode select arrow color */
:root.dark-mode select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%2390CAF9' class='bi bi-chevron-down' viewBox='0 0 16 16'%3E%3Cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3E%3C/svg%3E");
}

select:focus,
input[type="color"]:focus, 
input[type="range"]:focus, 
input[type="file"]:focus, 
input[type="number"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--focus-border-color);
    box-shadow: 0 0 0 3px rgba(100, 181, 246, 0.3); /* Soft blue glow */
}
/* Dark mode focus glow */
:root.dark-mode select:focus,
:root.dark-mode input[type="color"]:focus, 
:root.dark-mode input[type="range"]:focus, 
:root.dark-mode input[type="file"]:focus, 
:root.dark-mode input[type="number"]:focus,
:root.dark-mode textarea:focus {
    box-shadow: 0 0 0 3px rgba(156, 204, 101, 0.3);
}

input[type="color"] {
    height: 44px; /* Consistent height with other inputs */
    padding: 5px; /* Adjust padding for color picker */
}

input[type="range"] {
    padding: 0;
    height: 8px; /* Height of the track */
    background: var(--border-color);
    border-radius: 5px;
    opacity: 1; /* Always fully visible */
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px; /* Larger thumb for better touch */
    height: 22px;
    background: var(--secondary-color);
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    margin-top: -7px; /* Center thumb vertically */
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    transition: background-color 0.3s, border-color 0.3s;
}

input[type="range"]::-moz-range-thumb {
    width: 22px;
    height: 22px;
    background: var(--secondary-color);
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    transition: background-color 0.3s, border-color 0.3s;
}

.control-group {
    margin-bottom: var(--spacing-unit);
    display: flex; /* Use flexbox for grouping */
    flex-direction: column; /* Stack label and input */
    align-items: flex-end; /* Align items to the right for RTL */
    gap: 0.5rem; /* Space between label and input */
}

.control-group label {
    margin-bottom: 0.25rem;
}

.control-group input[type="range"] + span {
    display: inline-block;
    width: 60px; /* Adjust width for percentage display */
    text-align: left; /* Align percentage left */
    margin-right: 0; /* No margin on this side */
    margin-left: 10px; /* Add margin to separate from slider */
    font-weight: bold;
    color: var(--primary-color);
    vertical-align: middle;
}

/* Adjust the specific control group for opacity slider to keep them inline */
.control-group:has(#overlay-opacity) {
    flex-direction: row; /* Keep slider and span inline */
    justify-content: flex-end; /* Align to the right */
    align-items: center;
    gap: 10px; /* Gap between slider and span */
}
.control-group:has(#overlay-opacity) label {
    width: auto; /* Allow label to take its natural width */
    margin-left: auto; /* Push label to the far left (RTL) */
}

.control-group > label {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 10px;
}

.control-group > label:not(:first-child) {
    margin-top: 1rem;
}

/* New styles for font formatting controls */
.font-formatting-controls {
    display: flex;
    align-items: center;
    justify-content: flex-end; /* Align checkboxes to the right */
    gap: 15px;
    width: 100%;
}

.font-formatting-controls label {
    display: inline-flex;
    align-items: center;
    margin-bottom: 0;
    font-weight: normal;
    color: var(--text-color);
    cursor: pointer;
    gap: 5px;
}

.font-formatting-controls input[type="checkbox"] {
    width: auto;
    height: 20px; /* Make checkbox slightly larger */
    margin-bottom: 0;
    accent-color: var(--primary-color); /* Color for checkbox checked state */
    border-radius: 4px; /* Slightly rounded checkbox */
}

#generate-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 15px;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1.2rem;
    font-family: var(--font-family);
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s, transform 0.2s;
    min-height: 50px;
    box-shadow: 0 4px 8px var(--shadow-color);
}

#generate-btn:hover {
    background-color: var(--button-hover-color);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px var(--shadow-color);
}

#generate-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px var(--shadow-color);
}

#generate-btn:disabled {
    background-color: #bdbdbd; /* Lighter grey for disabled */
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.spinner {
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top: 4px solid #fff;
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.invite-output-container {
    max-width: 500px; /* Maintain max-width for the card */
    margin: calc(2 * var(--spacing-unit)) auto var(--spacing-unit) auto;
    display: flex;
    justify-content: center;
    align-items: center;
}

.actions-container {
    max-width: 550px; /* Match form container width */
    margin: 0 auto;
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap; /* Allows buttons to wrap to the next line */
    padding: 0 var(--spacing-unit);
    margin-top: var(--spacing-unit); /* Add some top margin to separate from invite output */
}

#refresh-btn, #export-gif-btn, #export-png-btn, #export-jpeg-btn, #export-clip-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 1 1 auto; /* Allow buttons to grow and shrink */
    max-width: 180px; /* Max width for individual buttons */
    padding: 10px 15px; /* Adjust padding for button text */
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: var(--font-family);
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s, transform 0.2s;
    opacity: 0;
    animation: fadeIn 0.5s forwards;
    min-height: 45px; /* Ensure consistent button height */
    box-shadow: 0 2px 5px var(--shadow-color);
}

#refresh-btn:hover, #export-gif-btn:hover, #export-png-btn:hover, #export-jpeg-btn:hover, #export-clip-btn:hover {
    background-color: var(--button-hover-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

#refresh-btn:active, #export-gif-btn:active, #export-png-btn:active, #export-jpeg-btn:active, #export-clip-btn:active {
    transform: translateY(0);
    box-shadow: 0 1px 3px var(--shadow-color);
}

#refresh-btn:disabled, #export-gif-btn:disabled, #export-png-btn:disabled, #export-jpeg-btn:disabled, #export-clip-btn:disabled {
    background-color: #bdbdbd;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.invite-card {
    position: relative; /* Needed for positioning the text-content-wrapper */
    width: 100%;
    aspect-ratio: 9 / 16;
    background-size: cover;
    background-position: center;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15); /* Slightly stronger shadow for the card */
    box-sizing: border-box;
    display: flex; /* Use flexbox to center the text wrapper */
    flex-direction: column;
    justify-content: center; /* Center vertically */
    align-items: center; /* Center horizontally */
    color: white; /* Default text color, will be overridden */
    text-shadow: 1px 1px 6px rgba(0,0,0,0.6); /* Softer text shadow */
    animation: fadeIn 1s ease-in-out;
    transition: background-image 0.5s ease-in-out, background-color 0.5s ease-in-out;
    overflow: hidden; /* Ensure content stays within bounds */
}

.text-content-wrapper {
    position: relative; /* To allow z-index and padding */
    z-index: 2; /* Ensure text is above background */
    width: 90%; /* Max width for the text content area */
    max-width: 400px; /* Fixed max-width for consistency */
    padding: calc(1.5 * var(--spacing-unit)) var(--spacing-unit); /* More padding */
    border-radius: var(--border-radius); /* Rounded corners for the text box */
    box-sizing: border-box;
    display: flex; /* Flexbox for text alignment within the wrapper */
    flex-direction: column;
    justify-content: center;
    transition: background-color 0.3s ease, opacity 0.3s ease;
}

/* Adjust text alignment within the wrapper */
.text-content-wrapper.align-left {
    align-items: flex-start;
}
.text-content-wrapper.align-center {
    align-items: center;
}
.text-content-wrapper.align-right {
    align-items: flex-end;
}

.invite-card h2, .invite-card p {
    margin: 0; /* Remove default margins for h2/p inside wrapper */
    padding: 0;
    width: 100%; /* Ensure text elements take full width of wrapper */
    transition: color 0.3s ease, font-family 0.3s ease, font-weight 0.3s ease, font-style 0.3s ease, text-align 0.3s ease;
}

.invite-card h2 {
    font-size: 2.2rem; /* Slightly larger title */
    margin-bottom: 0.5rem; /* Space between title and content */
}

.invite-card p {
    font-size: 1.3rem; /* Slightly larger content text */
    line-height: 1.7; /* Increased line height for readability */
    white-space: pre-wrap; /* To respect newlines in textarea */
}

/* Specific style for wedding title to be smaller */
.invite-card.wedding .text-content-wrapper h2 {
    font-size: 1.6rem;
}
.invite-card.wedding .text-content-wrapper p {
    font-size: 1.1rem;
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

/* Media queries for smaller screens (phones) */
@media (max-width: 768px) {
    body {
        padding: calc(0.5 * var(--spacing-unit)); /* Smaller padding on phones */
    }

    h1 {
        font-size: 2rem; /* Slightly smaller h1 for phones */
    }

    header p {
        font-size: 1rem;
    }
    
    .header-controls {
        flex-direction: column;
        gap: 5px;
    }

    .control-btn {
        width: 80%;
        max-width: 200px;
        margin: 0 auto;
    }

    .form-container {
        padding: var(--spacing-unit); /* Smaller padding inside the form container */
        margin-bottom: var(--spacing-unit); /* Slightly less margin */
    }

    input[type="color"], 
    input[type="range"], 
    input[type="file"], 
    input[type="number"],
    select, 
    textarea {
        font-size: 0.95rem; /* Slightly smaller font size for form inputs */
        padding: 0.7rem 0.9rem;
    }

    select {
        background-position: left 0.9rem center;
    }

    #generate-btn {
        font-size: 1.1rem;
        padding: 12px;
        min-height: 48px;
    }

    #refresh-btn, #export-gif-btn, #export-png-btn, #export-jpeg-btn, #export-clip-btn {
        font-size: 0.95rem;
        padding: 9px 12px;
        min-height: 42px;
        flex: 1 1 45%; /* Allow two buttons per row */
        max-width: unset; /* Remove max-width on mobile */
    }

    .actions-container {
        gap: 8px; /* Slightly smaller gap on mobile */
        padding: 0 0.5rem;
    }

    .invite-card h2 {
        font-size: 2rem; /* Adjust title size on card for small screens */
    }
    
    .invite-card p {
        font-size: 1.2rem; /* Adjust content size on card for small screens */
    }

    /* Specific wedding text size adjustment */
    .invite-card.wedding .text-content-wrapper h2 {
        font-size: 1.5rem;
    }
    .invite-card.wedding .text-content-wrapper p {
        font-size: 1rem;
    }

    .text-content-wrapper {
        padding: var(--spacing-unit) 0.8rem;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.8rem;
    }
    header p {
        font-size: 0.9rem;
    }
    .invite-card h2 {
        font-size: 1.8rem;
    }
    .invite-card p {
        font-size: 1.1rem;
    }
    .invite-card.wedding .text-content-wrapper h2 {
        font-size: 1.3rem;
    }
    .invite-card.wedding .text-content-wrapper p {
        font-size: 0.9rem;
    }

    #refresh-btn, #export-gif-btn, #export-png-btn, #export-jpeg-btn, #export-clip-btn {
        flex: 1 1 100%; /* Stack buttons on very small screens */
        margin-bottom: 5px; /* Add space between stacked buttons */
    }
    .actions-container {
        gap: 0; /* Remove gap when stacking */
    }
}