/* ==========================================================================
    QR Code Generator — Clean Minimal Dark Theme
    Matches UI mockup precisely
    Indentation: strictly 4 spaces
    ========================================================================== */

:root {
    --bg-page: #111215;
    --bg-card: #1c1d22;
    --bg-card-inner: #15161a;
    --bg-chip: #18191e;
    --bg-chip-hover: #22242b;
    --bg-chip-active: #282a32;

    --border-color: #2b2e38;
    --border-hover: #3e4250;
    --border-active: #5c6275;

    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;

    --accent-blue: #0d6efd;
    --accent-blue-hover: #0b5ed7;

    --radius-card: 24px;
    --radius-input: 12px;
    --radius-chip: 14px;
    --radius-pill: 9999px;

    --font-family: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    background-color: var(--bg-page);
    color: var(--text-primary);
    font-family: var(--font-family);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Page Container */
.page-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 32px 36px 60px 36px;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

/* Navbar */
.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 8px;
}

.nav-brand .nav-title {
    font-size: 18px;
    font-weight: 800;
    letter-spacing: 0.04em;
    color: var(--text-primary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.btn-theme-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 9px 18px;
    border-radius: var(--radius-pill);
    font-family: inherit;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
}

.btn-theme-toggle:hover {
    background-color: var(--bg-chip-hover);
    border-color: var(--border-hover);
    transform: translateY(-1px);
}

.sun-icon {
    display: block;
    color: #f59e0b;
}

.moon-icon {
    display: none;
    color: #6366f1;
}

/* Light Theme Variables & Overrides */
[data-theme="light"] {
    --bg-page: #f5f6f9;
    --bg-card: #ffffff;
    --bg-card-inner: #f8fafc;
    --bg-chip: #f1f5f9;
    --bg-chip-hover: #e2e8f0;
    --bg-chip-active: #e0e7ff;

    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    --border-active: #3b82f6;

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;

    --accent-blue: #0d6efd;
    --accent-blue-hover: #0b5ed7;
}

[data-theme="light"] .sun-icon {
    display: none;
}

[data-theme="light"] .moon-icon {
    display: block;
}

[data-theme="light"] .card {
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .toggle-slider {
    background-color: #cbd5e1;
}

[data-theme="light"] .qr-canvas-wrapper {
    background-color: #f8fafc;
    border: 1px solid #e2e8f0;
}

[data-theme="light"] .qr-canvas-wrapper.is-transparent {
    background-color: #ffffff;
    background-image:
        linear-gradient(45deg, #f1f5f9 25%, transparent 25%),
        linear-gradient(-45deg, #f1f5f9 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #f1f5f9 75%),
        linear-gradient(-45deg, transparent 75%, #f1f5f9 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

[data-theme="light"] #dl-svg-btn {
    background-color: #0f172a;
    color: #ffffff;
}

[data-theme="light"] #dl-svg-btn:hover {
    background-color: #1e293b;
}

[data-theme="light"] .toast {
    background-color: #0f172a;
    color: #ffffff;
    border-color: #334155;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}


/* Main Content Grid */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1.05fr;
    gap: 32px;
    align-items: start;
}

/* Card Container */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-card);
    padding: 32px;
    box-shadow: 0 10px 40px -15px rgba(0, 0, 0, 0.6);
}

.controls-card {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Form Groups & Labels */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.section-label, .control-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
}

.subheading {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin-top: 4px;
}

/* URL Input & Button */
.url-input-wrapper {
    display: flex;
    gap: 10px;
    align-items: center;
}

.url-input {
    flex: 1;
    height: 48px;
    background-color: var(--bg-card-inner);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-input);
    padding: 0 16px;
    font-family: inherit;
    font-size: 14px;
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.url-input:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.2);
}

.btn-primary {
    height: 48px;
    background-color: var(--accent-blue);
    color: #ffffff;
    border: none;
    border-radius: var(--radius-input);
    padding: 0 20px;
    font-family: inherit;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: background-color 0.15s ease, transform 0.1s ease;
}

.btn-primary:hover {
    background-color: var(--accent-blue-hover);
}

.btn-primary:active {
    transform: scale(0.98);
}

/* Dot Styles Grid */
.dot-styles-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
}

.corner-styles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.style-chip {
    background-color: var(--bg-chip);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-chip);
    padding: 14px 6px 10px 6px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
    transition: all 0.15s ease;
    color: var(--text-secondary);
}

.style-chip:hover {
    background-color: var(--bg-chip-hover);
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.style-chip.active {
    background-color: var(--bg-chip-active);
    border-color: var(--border-active);
    color: var(--text-primary);
    box-shadow: 0 0 0 1px var(--border-active);
}

.chip-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chip-label {
    font-size: 11px;
    font-weight: 500;
    color: var(--text-muted);
    text-align: center;
    white-space: nowrap;
}

.style-chip.active .chip-label {
    color: var(--text-primary);
}

/* Colors Grid */
.colors-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.color-control-box {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.color-control-box.disabled {
    opacity: 0.35;
    pointer-events: none;
}

.color-picker-input-group {
    background-color: var(--bg-card-inner);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-input);
    padding: 8px 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    height: 48px;
}

.color-swatch-label {
    position: relative;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.native-color-input {
    position: absolute;
    width: 0;
    height: 0;
    opacity: 0;
    pointer-events: none;
}

.swatch-color {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    display: block;
}

.hex-text-input {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: monospace;
    font-size: 14px;
    outline: none;
    width: 90px;
    text-transform: uppercase;
}

/* Transparent Background Row */
.transparent-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 4px;
}

.transparent-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.transparent-toggle-wrap {
    display: flex;
    align-items: center;
    gap: 12px;
}

.toggle-indicator-color {
    font-size: 12px;
    font-family: monospace;
    color: var(--text-muted);
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
    cursor: pointer;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    inset: 0;
    background-color: #2b2e38;
    border-radius: var(--radius-pill);
    transition: background-color 0.2s ease;
}

.toggle-slider::before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: #ffffff;
    border-radius: 50%;
    transition: transform 0.2s ease;
}

.toggle-switch input:checked + .toggle-slider {
    background-color: var(--accent-blue);
}

.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(20px);
}

/* Add Logo Section */
.logo-section {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.btn-upload-logo {
    width: 100%;
    height: 48px;
    background-color: var(--bg-card-inner);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-input);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn-upload-logo:hover {
    background-color: var(--bg-chip-hover);
    border-color: var(--border-hover);
}

.camera-icon {
    color: var(--text-secondary);
}

.center-logo-row {
    display: flex;
    align-items: center;
    padding-top: 2px;
}

.custom-checkbox {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
}

.custom-checkbox input {
    display: none;
}

.checkmark {
    width: 16px;
    height: 16px;
    border-radius: 4px;
    background-color: var(--accent-blue);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.checkmark::after {
    content: "";
    width: 4px;
    height: 8px;
    border: solid #ffffff;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
    margin-bottom: 2px;
}

.checkbox-label {
    font-size: 13px;
    color: var(--text-secondary);
}

/* Uploaded Logo Badge & Controls */
.logo-status-container {
    background-color: var(--bg-card-inner);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-input);
    padding: 8px 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-preview-badge {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
}

.logo-preview-badge img {
    width: 28px;
    height: 28px;
    object-fit: contain;
    border-radius: 4px;
    background: #ffffff;
    padding: 2px;
}

.logo-name-text {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.btn-remove-logo {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 14px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: color 0.15s ease;
}

.btn-remove-logo:hover {
    color: #ef4444;
}

/* Logo Scale Slider */
.logo-scale-row {
    background-color: var(--bg-card-inner);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-input);
    padding: 10px 14px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.scale-label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.scale-label {
    font-size: 12px;
    color: var(--text-secondary);
}

.scale-val {
    font-size: 12px;
    font-weight: 600;
    color: var(--accent-blue);
}

.custom-slider {
    appearance: none;
    -webkit-appearance: none;
    width: 100%;
    height: 4px;
    background: #2b2e38;
    border-radius: var(--radius-pill);
    outline: none;
}

.custom-slider::-webkit-slider-thumb {
    appearance: none;
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    background: var(--accent-blue);
    border-radius: 50%;
    cursor: pointer;
}

/* Right Column: Preview & Downloads */
.preview-column {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.preview-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 36px;
}

.qr-canvas-wrapper {
    background-color: #0d0e12;
    border-radius: 20px;
    width: 440px;
    height: 440px;
    max-width: 100%;
    aspect-ratio: 1 / 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    overflow: hidden;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

/* Optional checkerboard pattern only when transparent */
.qr-canvas-wrapper.is-transparent {
    background-color: #12141a;
    background-image:
        linear-gradient(45deg, #1a1d26 25%, transparent 25%),
        linear-gradient(-45deg, #1a1d26 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #1a1d26 75%),
        linear-gradient(-45deg, transparent 75%, #1a1d26 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

#qr-target-container {
    width: 100%;
    height: 100%;
    max-width: 100%;
    max-height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

#qr-target-container svg,
#qr-target-container canvas {
    max-width: 100% !important;
    max-height: 100% !important;
    width: 100% !important;
    height: 100% !important;
    object-fit: contain;
    display: block;
    border-radius: 12px;
}


.preview-caption {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    margin-top: 24px;
}

/* Download Bar */
.download-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.btn-download {
    border-radius: var(--radius-pill);
    padding: 12px 24px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: inherit;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s ease;
    border: none;
    text-decoration: none;
}

/* Download SVG button in mockup is white pill with dark text */
#dl-svg-btn {
    background-color: #ffffff;
    color: #111215;
}

#dl-svg-btn:hover {
    background-color: #e5e7eb;
    transform: translateY(-1px);
}

/* Download PNG & JPEG buttons are dark pills */
#dl-png-btn, #dl-jpeg-btn {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

#dl-png-btn:hover, #dl-jpeg-btn:hover {
    background-color: var(--bg-chip-hover);
    border-color: var(--border-hover);
    transform: translateY(-1px);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(40px);
    background-color: #1f2128;
    color: #ffffff;
    border: 1px solid var(--border-color);
    padding: 10px 22px;
    border-radius: var(--radius-pill);
    font-size: 13px;
    font-weight: 500;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
    opacity: 0;
    pointer-events: none;
    transition: all 0.25s ease;
    z-index: 1000;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Responsive */
@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
    }

    .qr-canvas-wrapper {
        width: 380px;
        height: 380px;
    }
}

@media (max-width: 640px) {
    .page-container {
        padding: 20px 16px;
    }

    .navbar {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
    }


    .card {
        padding: 20px;
    }

    .dot-styles-grid {
        grid-template-columns: repeat(3, 1fr);
    }

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

    .download-bar {
        flex-direction: column;
        width: 100%;
    }

    .btn-download {
        width: 100%;
        justify-content: center;
    }
}