/* ========================================
   QR Code Generator - Styles
   Color Palette:
   - #FAF3E1 (soft cream) - background
   - #F5E7C6 (warm sand) - card background
   - #FF6D1F (accent orange) - primary accent
   - #222222 (deep charcoal) - text color
   ======================================== */

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-cream: #FAF3E1;
    --color-sand: #F5E7C6;
    --color-orange: #FF6D1F;
    --color-charcoal: #222222;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.2s ease-in-out;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--color-cream);
    color: var(--color-charcoal);
    line-height: 1.6;
    min-height: 100vh;
    padding: 1rem;
}

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

/* Main Layout */
main {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 2rem);
    padding: 2rem 0;
}

.card {
    background-color: var(--color-sand);
    border-radius: 1rem; /* 2xl equivalent */
    box-shadow: var(--shadow-lg);
    padding: 2.5rem;
    width: 100%;
    max-width: 800px;
    transition: var(--transition);
}

/* Header */
header {
    text-align: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-charcoal);
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--color-charcoal);
    opacity: 0.8;
    font-size: 0.95rem;
}

/* Form Sections */
.input-section,
.options-section,
.preview-section {
    margin-bottom: 2rem;
}

.input-group {
    margin-bottom: 1rem;
}

/* Input Field */
input[type="text"] {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    border: 2px solid transparent;
    border-radius: 0.5rem;
    background-color: white;
    color: var(--color-charcoal);
    transition: var(--transition);
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--color-orange);
    box-shadow: 0 0 0 3px rgba(255, 109, 31, 0.1);
}

input[type="text"]::placeholder {
    color: #999;
}

.input-hint {
    font-size: 0.875rem;
    color: var(--color-charcoal);
    opacity: 0.7;
    margin-top: 0.5rem;
}

/* URL Preview */
.url-preview {
    margin-top: 1rem;
    padding: 0.875rem 1rem;
    background-color: white;
    border-radius: 0.5rem;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.url-preview-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.url-preview-icon {
    font-size: 1.25rem;
}

.url-hostname {
    font-weight: 500;
    color: var(--color-charcoal);
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    cursor: pointer;
    user-select: none;
}

.toggle-label input[type="checkbox"] {
    width: 1.125rem;
    height: 1.125rem;
    cursor: pointer;
    accent-color: var(--color-orange);
}

/* Options Grid */
.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.option-group-full {
    grid-column: 1 / -1;
}

.option-group label {
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--color-charcoal);
}

/* Select Dropdowns */
select {
    width: 100%;
    padding: 0.75rem;
    font-size: 0.95rem;
    border: 2px solid transparent;
    border-radius: 0.5rem;
    background-color: white;
    color: var(--color-charcoal);
    cursor: pointer;
    transition: var(--transition);
}

select:focus {
    outline: none;
    border-color: var(--color-orange);
    box-shadow: 0 0 0 3px rgba(255, 109, 31, 0.1);
}

select:hover {
    border-color: rgba(255, 109, 31, 0.3);
}

/* Color Input Wrapper */
.color-input-wrapper {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

input[type="color"] {
    width: 3rem;
    height: 2.5rem;
    border: 2px solid transparent;
    border-radius: 0.5rem;
    cursor: pointer;
    background: none;
    padding: 0;
    transition: var(--transition);
}

input[type="color"]:focus {
    outline: none;
    border-color: var(--color-orange);
    box-shadow: 0 0 0 3px rgba(255, 109, 31, 0.1);
}

input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

input[type="color"]::-webkit-color-swatch {
    border: none;
    border-radius: 0.25rem;
}

#foreground-color-text,
#background-color-text {
    flex: 1;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
}

/* Logo Upload */
.logo-upload-wrapper {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    flex-wrap: wrap;
}

input[type="file"] {
    flex: 1;
    min-width: 150px;
    padding: 0.5rem;
    font-size: 0.875rem;
    border: 2px dashed rgba(0, 0, 0, 0.2);
    border-radius: 0.5rem;
    background-color: white;
    cursor: pointer;
    transition: var(--transition);
}

input[type="file"]:hover {
    border-color: var(--color-orange);
    border-style: solid;
}

input[type="file"]:focus {
    outline: none;
    border-color: var(--color-orange);
    box-shadow: 0 0 0 3px rgba(255, 109, 31, 0.1);
}

.logo-filename {
    font-size: 0.875rem;
    color: var(--color-charcoal);
    opacity: 0.8;
}

.option-hint {
    font-size: 0.75rem;
    color: var(--color-charcoal);
    opacity: 0.6;
    margin-top: 0.25rem;
}

/* Buttons */
.action-group {
    margin-top: 2rem;
    display: flex;
    justify-content: center;
}

.button-primary,
.button-secondary {
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.button-primary {
    background-color: var(--color-orange);
    color: white;
    width: 100%;
}

.button-primary:hover:not(:disabled) {
    background-color: #e55f19;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.button-primary:active:not(:disabled) {
    transform: translateY(0);
}

.button-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.button-primary:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 109, 31, 0.3);
}

.button-secondary {
    background-color: white;
    color: var(--color-charcoal);
    border: 2px solid rgba(0, 0, 0, 0.1);
}

.button-secondary:hover {
    background-color: var(--color-cream);
    border-color: var(--color-orange);
    transform: translateY(-1px);
}

.button-secondary:active {
    transform: translateY(0);
}

.button-secondary:focus {
    outline: none;
    border-color: var(--color-orange);
    box-shadow: 0 0 0 3px rgba(255, 109, 31, 0.1);
}

/* Preview Section */
.preview-section {
    margin-top: 2.5rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    text-align: center;
}

/* Loading Indicator */
.loading-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 2rem;
    color: var(--color-charcoal);
    opacity: 0.7;
}

.spinner {
    width: 2.5rem;
    height: 2.5rem;
    border: 3px solid rgba(255, 109, 31, 0.2);
    border-top-color: var(--color-orange);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* QR Preview */
.qr-preview {
    display: inline-block;
    padding: 1.5rem;
    background-color: white;
    border-radius: 0.5rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
    transition: var(--transition);
}

.qr-preview:hover {
    box-shadow: var(--shadow-md);
}

.qr-preview canvas,
.qr-preview svg {
    display: block;
    max-width: 100%;
    height: auto;
}

/* Preview Actions */
.preview-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.preview-actions .button-primary {
    width: auto;
    min-width: 150px;
}

/* Status Message */
.status-message {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--color-charcoal);
    color: white;
    padding: 0.875rem 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow-lg);
    font-size: 0.9rem;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.status-message:not([hidden]) {
    opacity: 1;
}

.status-message.success {
    background-color: #10b981;
}

.status-message.error {
    background-color: #ef4444;
}

/* Responsive Design */
@media (max-width: 640px) {
    body {
        padding: 0.5rem;
    }

    .card {
        padding: 1.5rem;
        border-radius: 0.75rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    .options-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .preview-actions {
        flex-direction: column;
    }

    .preview-actions .button-primary,
    .preview-actions .button-secondary {
        width: 100%;
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
    }

    .card {
        border: 2px solid var(--color-charcoal);
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}