/* --- Base & Body Styles --- */
html {
    /* Prevent horizontal shift when scrollbar appears/disappears */
    overflow-y: scroll;
}

body {
    font-family: Arial, sans-serif;
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    text-align: center;
    background-color: #f0f0f0;
    animation: fadeIn 0.8s ease-in-out; /* Initial page load animation */
}

/* --- Header and Title Styles --- */
header {
    margin-bottom: 30px;
    animation: slideInDown 0.5s ease-out;
}

.subtitle {
    color: #666;
    font-size: 1.1em;
    margin-top: -10px;
    margin-bottom: 20px;
    font-weight: normal;
    line-height: 1.4;
}

/* --- Keyframe Animations --- */

/* Fade-in animation for the body */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

h1 {
    animation: slideInDown 0.5s ease-out;
    color: #333;
    margin-bottom: 30px;
}

/* Slide-in animation for the main heading */
@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- QR Code Container --- */
#qr-container {
    margin-top: 20px;
    background-color: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    animation: slideInUp 0.4s ease-out 0.1s both; /* Delayed slide-in */
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#qr-container:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

/* Slide-up animation for the QR container */
@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Form Elements (Inputs, Buttons, Select) --- */
input, button, select, textarea {
    font-size: 14px;
    margin: 10px 0;
    padding: 12px;
    width: 100%;
    box-sizing: border-box;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    transition: all 0.3s ease;
    animation: fadeInUp 0.3s ease-out 0.1s both; /* Staggered fade-in */
}

textarea {
    font-family: Arial, sans-serif; /* Ensure consistent font */
    resize: vertical; /* Allow vertical resizing only */
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: #007acc;
    box-shadow: 0 0 0 3px rgba(0, 122, 204, 0.1);
    transform: scale(1.02);
}


/* Fade-up animation for form elements */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Button Styles --- */
button {
    background: linear-gradient(135deg, #007acc, #005a9e);
    color: white;
    border: none;
    cursor: pointer;
    font-weight: bold;
    position: relative; /* For pseudo-element positioning */
    overflow: hidden; /* Hides the ::before element outside the button */
}

button:hover {
    background: linear-gradient(135deg, #005a9e, #004080);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 122, 204, 0.3);
}

button:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(0, 122, 204, 0.3);
}

/* Shimmer effect on button hover */
button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

button:hover::before {
    left: 100%;
}

/* --- QR Image & Download Button --- */
#qr-image {
    max-width: 100%;
    height: auto;
    margin-top: 20px;
    border-radius: 8px;
    transition: all 0.3s ease;
    animation: qrAppear 0.6s ease-out;
}

/* Animation for the QR code appearing */
@keyframes qrAppear {
    from {
        opacity: 0;
        transform: scale(0.8) rotate(5deg);
    }
    to {
        opacity: 1;
        transform: scale(1) rotate(0deg);
    }
}

#qr-image:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

#download-btn {
    display: none; /* Initially hidden */
    margin-top: 15px;
    background: linear-gradient(135deg, #28a745, #20c997);
    animation: bounceIn 0.4s ease-out;
}

#download-btn:hover {
    background: linear-gradient(135deg, #20c997, #17a2b8);
}

/* Bounce-in animation for the download button */
@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }
    50% {
        opacity: 1;
        transform: scale(1.05);
    }
    70% {
        transform: scale(0.9);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

/* --- Character Counter --- */
.char-counter {
    color: #666;
    font-size: 0.8em;
    margin-top: 5px;
    margin-bottom: 10px;
    text-align: right;
    animation: fadeIn 0.8s ease-out 0.7s both;
    transition: color 0.3s ease;
}

.char-counter.warning {
    color: #ff6b35;
    font-weight: bold;
    animation: pulse 1s ease-in-out;
}

/* Pulse animation for character count warning */
@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* --- Miscellaneous Styles --- */
#size-select {
    background-color: white;
    cursor: pointer;
}

#size-select:hover {
    border-color: #007acc;
}

p {
    animation: fadeIn 1s ease-out 1s both;
}

a {
    transition: all 0.3s ease;
    text-decoration: none;
}

a:hover {
    color: #005a9e !important;
    text-decoration: underline;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    text-align: left;
    font-size: 0.9em;
    color: #444;
    animation: fadeInUp 0.6s ease-out 0.5s both;
}

.input-group.full-width {
    grid-column: 1 / -1; /* Span across both columns in the grid */
}

/* --- Loading Spinner Animation --- */
/* Applied to qr-container during generation */
.loading {
    position: relative;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid #007acc;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* --- Responsive Design --- */
/* Simplify animations on smaller screens */
@media (max-width: 768px) {
    body {
        padding: 15px;
    }
    
    #qr-container {
        padding: 15px;
    }
    
    /* Disable hover transforms on touch devices to prevent sticky hover states */
    button:hover {
        transform: none;
    }
}

/* --- QR Code Data Display --- */
#qr-code-text {
    font-size: 0.9em;
    color: #555;
    margin-top: 15px;
    word-wrap: break-word;
    padding: 10px;
    background-color: #f9f9f9;
    border-radius: 5px;
    border: 1px solid #eee;
    animation: fadeIn 0.5s ease-out;
}

#qr-placeholder {
    color: #888;
    margin-top: 20px;
    padding: 20px 0;
}

/* --- Tab Navigation Styles --- */
#tabs {
    display: flex;
    margin-bottom: 20px;
    gap: 10px;
    animation: fadeIn 0.4s ease-in-out;
}

.tab-link {
    background: #fff;
    color: #333;
    border: 2px solid #e0e0e0;
    outline: none;
    cursor: pointer;
    padding: 12px 16px;
    font-size: 16px;
    transition: all 0.3s ease;
    margin: 0;
    width: auto;
    box-sizing: border-box;
    border-radius: 8px;
    font-weight: bold;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1.2;
    height: 48px;
}

.tab-link:hover:not(.active) {
    border-color: #aaa;
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.tab-link.active {
    background: linear-gradient(135deg, #28a745, #20c997);
    color: white;
    border-color: transparent;
    box-shadow: 0 4px 10px rgba(40, 167, 69, 0.3);
}

.tab-link.active:hover {
     background: linear-gradient(135deg, #20c997, #17a2b8);
     transform: translateY(-2px);
     box-shadow: 0 6px 15px rgba(32, 201, 151, 0.4);
}

.tab-content {
    display: none; /* Hidden by default, shown via JS */
    animation: fadeIn 0.5s;
}

/* --- vCard Form Grid Layout --- */
.vcard-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

/* No extra margin needed for inputs inside the grid; gap property handles spacing */
.vcard-grid input {
     margin: 0;
}

/* --- Layout Groups & Checkboxes --- */
.input-group {
    display: flex;
    flex-direction: column;
}

.checkbox-group {
    flex-direction: row;
    align-items: center;
    gap: 10px;
    margin-top: 10px;
}
.checkbox-group input[type="checkbox"] {
    width: auto;
    margin: 0;
    animation: none; /* No need to animate tiny checkboxes */
}
.checkbox-group label {
    display: inline; /* Override block display */
    margin: 0;
    font-weight: normal;
    animation: none;
}

/* --- Radio Button Group Styles --- */
.radio-group-container {
    display: flex;
    flex-direction: row;
    gap: 20px;
    align-items: center;
    margin-bottom: 10px;
    grid-column: 1 / -1; /* Span full width in grid */
}

.radio-group {
    display: flex;
    align-items: center;
    gap: 8px;
    line-height: 1.2;
}

.radio-group input[type="radio"] {
    appearance: none;
    width: 1.2em;
    height: 1.2em;
    border: 2px solid #007acc;
    border-radius: 50%;
    display: inline-block;
    position: relative;
    vertical-align: middle;
    margin: 0;
    background-color: white;
    cursor: pointer;
}

.radio-group input[type="radio"]::before {
    content: "";
    position: absolute;
    width: 60%;
    height: 60%;
    border-radius: 50%;
    top: 20%;
    left: 20%;
    background-color: #007acc;
    transform: scale(0);
    transition: transform 0.2s ease-in-out;
}

.radio-group input[type="radio"]:checked::before {
    transform: scale(1);
}

.radio-group label {
    vertical-align: middle;
    margin: 0;
    cursor: pointer;
}

/* --- Footer Styles --- */
footer {
    border-top: 1px solid #e0e0e0;
    padding-top: 20px;
    margin-top: 40px;
    text-align: center;
}

footer p {
    margin: 8px 0;
    line-height: 1.5;
}

footer a {
    text-decoration: none;
    font-weight: 500;
}

footer a:hover {
    text-decoration: underline;
}

/* --- Customization Panel Styles --- */
.customization-section {
    margin: 20px 0;
    animation: fadeInUp 0.5s ease-out 0.3s both;
}

.customize-toggle {
    width: 100%;
    text-align: left;
    background: #ffffff;
    color: #333;
    border: 2px solid #e0e0e0;
    padding: 12px 16px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.customize-toggle:hover {
    border-color: #007acc;
    background: #f9f9f9;
    transform: translateY(-1px);
}

#customize-icon {
    transition: transform 0.3s ease;
    display: inline-block;
    width: 12px;
}

.customize-panel {
    background: #f9f9f9;
    border: 2px solid #e0e0e0;
    border-top: none;
    border-radius: 0 0 8px 8px;
    padding: 20px;
    margin-top: -8px;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.customize-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 15px;
}

.color-input-wrapper {
    display: flex;
    gap: 8px;
    align-items: center;
}

.color-input-wrapper input[type="color"] {
    width: 60px;
    height: 40px;
    padding: 2px;
    border-radius: 4px;
    border: 2px solid #e0e0e0;
    cursor: pointer;
    margin: 0;
}

.color-input-wrapper input[type="text"] {
    flex: 1;
    font-family: 'Courier New', monospace;
    text-transform: uppercase;
    margin: 0;
    padding: 8px;
    font-size: 14px;
}

.secondary-btn {
    background: linear-gradient(135deg, #6c757d, #5a6268);
    color: white;
    font-size: 14px;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
}

.secondary-btn:hover {
    background: linear-gradient(135deg, #5a6268, #495057);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

#qr-canvas-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 20px;
    min-height: 50px;
}

#qr-canvas-container canvas,
#qr-canvas-container svg {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

#qr-canvas-container canvas:hover,
#qr-canvas-container svg:hover {
    transform: scale(1.02);
}

/* Logo Section Styles */
.logo-section,
.style-section {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #e0e0e0;
}

.section-title {
    font-size: 16px;
    font-weight: bold;
    color: #333;
    margin: 0 0 12px 0;
}

.logo-upload-area {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.small-btn {
    padding: 8px 16px;
    font-size: 13px;
    margin: 0;
}

.logo-filename {
    font-size: 0.9em;
    color: #666;
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.icon-btn {
    width: 32px;
    height: 32px;
    padding: 0;
    background: #dc3545;
    color: white;
    font-size: 18px;
    line-height: 1;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
}

.icon-btn:hover {
    background: #c82333;
    transform: scale(1.1);
}

.logo-preview {
    text-align: center;
    margin: 15px 0;
    padding: 10px;
    background: #fff;
    border: 2px dashed #e0e0e0;
    border-radius: 8px;
}

.logo-preview img {
    max-width: 120px;
    max-height: 120px;
    border-radius: 4px;
    object-fit: contain;
}

.slider-group {
    margin-bottom: 12px;
}

.slider-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: #444;
    margin-bottom: 6px;
}

.slider-group span {
    color: #007acc;
    font-weight: bold;
}

.slider-group input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: #e0e0e0;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.slider-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: linear-gradient(135deg, #007acc, #005a9e);
    cursor: pointer;
    transition: all 0.3s ease;
}

.slider-group input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 2px 8px rgba(0, 122, 204, 0.4);
}

.slider-group input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: linear-gradient(135deg, #007acc, #005a9e);
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
}

.slider-group input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 2px 8px rgba(0, 122, 204, 0.4);
}

/* Style Section */
.style-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 12px;
    margin-bottom: 15px;
}

.helper-text {
    font-size: 12px;
    color: #666;
    margin: 8px 0 0 0;
    font-style: italic;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .customize-grid {
        grid-template-columns: 1fr;
    }

    .color-input-wrapper input[type="color"] {
        width: 50px;
        height: 36px;
    }

    .logo-preview img {
        max-width: 100px;
        max-height: 100px;
    }

    .style-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   LOCALIZATION STYLES
   ======================================== */

/* Language Selector */
.language-selector {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 15px 0;
    animation: fadeIn 0.5s ease-out;
}

.language-selector select {
    width: auto;
    min-width: 150px;
    max-width: 200px;
    padding: 8px 12px;
    font-size: 14px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    background-color: white;
    cursor: pointer;
    transition: all 0.3s ease;
}

.language-selector select:hover {
    border-color: #007acc;
}

.language-selector select:focus {
    outline: none;
    border-color: #007acc;
    box-shadow: 0 0 0 3px rgba(0, 122, 204, 0.1);
}

/* Screen reader only label */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* CJK (Chinese, Japanese, Korean) Font Support */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial,
                 "Noto Sans CJK SC", "Noto Sans CJK JP", "Noto Sans CJK KR",
                 sans-serif;
}

html[lang="zh"],
html[lang="ja"],
html[lang="ko"] {
    line-height: 1.6;
}

html[lang="zh"] body,
html[lang="ja"] body,
html[lang="ko"] body {
    font-size: 15px;
}

/* Prevent text overflow in buttons with longer translations */
button,
.tab-link {
    white-space: normal;
    word-wrap: break-word;
    min-height: 44px;
}

/* Responsive header title */
h1 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    line-height: 1.3;
}

/* Mobile adjustments */
@media (max-width: 768px) {
    .language-selector select {
        min-width: 130px;
        font-size: 13px;
    }
}