/* ============================================================
   QR Code Generator - Styles
   Dark theme matching parent site design system
   ============================================================ */

:root {
    --bg-dark: #0f172a;
    --bg-panel: #1e293b;
    --bg-input: #0f172a;
    --accent: #60a5fa;
    --accent-hover: #3b82f6;
    --accent-dim: rgba(96, 165, 250, 0.15);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-dim: #64748b;
    --border: rgba(255, 255, 255, 0.08);
    --border-focus: rgba(96, 165, 250, 0.5);
    --radius: 10px;
    --radius-sm: 6px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
    --gradient-header: linear-gradient(135deg, #1e3a5f 0%, #2563eb 50%, #7c3aed 100%);
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

/* ---- Header / Top Bar ---- */
.top-bar {
    background: var(--gradient-header);
    padding: 1.25rem 2rem;
    border-bottom: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.top-bar::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 600px 300px at 20% 50%, rgba(96,165,250,0.12), transparent),
        radial-gradient(ellipse 400px 200px at 80% 50%, rgba(124,58,237,0.10), transparent);
    pointer-events: none;
}

.top-bar-inner {
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    flex-shrink: 0;
}

.top-bar h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: #fff;
}

.subtitle {
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.65);
    font-weight: 400;
    padding-left: 2.75rem;
}

/* ---- Main Layout ---- */
.app-container {
    max-width: 1400px;
    margin: 1.5rem auto;
    padding: 0 1.5rem;
    display: grid;
    grid-template-columns: 420px 1fr;
    gap: 1.5rem;
    align-items: start;
}

@media (max-width: 960px) {
    .app-container {
        grid-template-columns: 1fr;
    }
}

/* ---- Panels ---- */
.panel {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.left-panel {
    display: flex;
    flex-direction: column;
    max-height: calc(100vh - 140px);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--text-dim) transparent;
}

.left-panel::-webkit-scrollbar {
    width: 6px;
}
.left-panel::-webkit-scrollbar-track {
    background: transparent;
}
.left-panel::-webkit-scrollbar-thumb {
    background: var(--text-dim);
    border-radius: 3px;
}

.right-panel {
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 1.5rem;
}

/* ---- Section Blocks ---- */
.section-block {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
}

.section-block:last-child {
    border-bottom: none;
}

.section-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-dim);
    margin-bottom: 0.875rem;
}

/* ---- Mode Tabs ---- */
.mode-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}

.mode-tab {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 0.875rem;
    font-size: 0.8125rem;
    font-weight: 500;
    font-family: inherit;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.mode-tab:hover {
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.15);
    background: rgba(255, 255, 255, 0.03);
}

.mode-tab.active {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-dim);
}

.mode-tab svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

/* ---- Form Fields ---- */
.mode-form {
    display: none;
}

.mode-form.active {
    display: block;
}

.field-group {
    margin-bottom: 0.875rem;
}

.field-group:last-child {
    margin-bottom: 0;
}

.field-group label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.375rem;
}

.field-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

input[type="text"],
input[type="url"],
input[type="email"],
input[type="tel"],
textarea,
select {
    width: 100%;
    padding: 0.625rem 0.875rem;
    font-size: 0.875rem;
    font-family: inherit;
    color: var(--text-primary);
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    resize: vertical;
}

input:focus,
textarea:focus,
select:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.1);
}

input::placeholder,
textarea::placeholder {
    color: var(--text-dim);
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2rem;
}

select option {
    background: var(--bg-panel);
    color: var(--text-primary);
}

/* ---- Color Picker ---- */
.color-input-wrap {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.375rem 0.625rem;
}

input[type="color"] {
    -webkit-appearance: none;
    appearance: none;
    width: 28px;
    height: 28px;
    border: 2px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
    padding: 0;
    background: none;
}

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

input[type="color"]::-webkit-color-swatch {
    border: none;
    border-radius: 2px;
}

.color-value {
    font-size: 0.8125rem;
    font-family: 'SF Mono', 'Fira Code', monospace;
    color: var(--text-dim);
}

/* ---- Range Slider ---- */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg-panel);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
    transition: transform 0.15s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg-panel);
    cursor: pointer;
}

/* ---- EC Level Buttons ---- */
.ec-buttons {
    display: flex;
    gap: 0.375rem;
}

.ec-btn {
    flex: 1;
    padding: 0.5rem;
    font-size: 0.8125rem;
    font-weight: 600;
    font-family: inherit;
    color: var(--text-secondary);
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}

.ec-btn:hover {
    border-color: rgba(255, 255, 255, 0.15);
    color: var(--text-primary);
}

.ec-btn.active {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-dim);
}

/* ---- Toggle Switch ---- */
.toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.toggle-row label:first-child {
    margin-bottom: 0;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
    flex-shrink: 0;
}

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

.toggle-slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    left: 2px;
    top: 2px;
    background: var(--text-dim);
    border-radius: 50%;
    transition: all 0.3s ease;
}

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

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

/* ---- File Upload ---- */
.file-upload-label {
    display: flex !important;
    align-items: center;
    gap: 0.625rem;
    padding: 0.625rem 0.875rem;
    background: var(--bg-input);
    border: 1px dashed var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.8125rem;
    color: var(--text-dim);
}

.file-upload-label:hover {
    border-color: var(--accent);
    color: var(--text-secondary);
}

.file-upload-label svg {
    flex-shrink: 0;
    color: var(--text-dim);
}

.btn-small {
    margin-top: 0.5rem;
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
    font-family: inherit;
    font-weight: 500;
    color: #f87171;
    background: rgba(248, 113, 113, 0.1);
    border: 1px solid rgba(248, 113, 113, 0.2);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-small:hover {
    background: rgba(248, 113, 113, 0.2);
}

/* ---- Preview Area ---- */
.preview-area {
    padding: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 480px;
    background:
        radial-gradient(circle at 50% 50%, rgba(30, 41, 59, 0.5), transparent 70%),
        repeating-conic-gradient(rgba(255,255,255,0.02) 0% 25%, transparent 0% 50%) 0 0 / 20px 20px;
}

.preview-canvas-wrap {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

#qr-canvas {
    display: block;
    max-width: 100%;
    height: auto;
    image-rendering: pixelated;
}

.empty-state {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: var(--text-dim);
    font-size: 0.875rem;
}

/* ---- Export Bar ---- */
.export-bar {
    display: flex;
    gap: 0.625rem;
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
}

.btn-export {
    flex: 1;
    min-width: 140px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    font-size: 0.8125rem;
    font-weight: 600;
    font-family: inherit;
    color: #fff;
    background: linear-gradient(135deg, var(--accent-hover), var(--accent));
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.btn-export:hover {
    background: linear-gradient(135deg, #2563eb, #60a5fa);
    box-shadow: 0 4px 16px rgba(59, 130, 246, 0.3);
    transform: translateY(-1px);
}

.btn-export:active {
    transform: translateY(0);
}

.btn-export svg {
    flex-shrink: 0;
}

/* ---- Toast Notification ---- */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 0.75rem 1.5rem;
    background: var(--bg-panel);
    color: var(--text-primary);
    border: 1px solid var(--accent);
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    opacity: 0;
    pointer-events: none;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
}

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

/* ---- Responsive ---- */
@media (max-width: 960px) {
    .app-container {
        padding: 0 1rem;
        margin: 1rem auto;
    }

    .right-panel {
        position: static;
    }

    .left-panel {
        max-height: none;
    }

    .preview-area {
        min-height: 360px;
        padding: 1.5rem;
    }

    .top-bar {
        padding: 1rem 1.25rem;
    }

    .top-bar h1 {
        font-size: 1.25rem;
    }

    .subtitle {
        padding-left: 2.5rem;
    }
}

@media (max-width: 480px) {
    .mode-tabs {
        display: grid;
        grid-template-columns: 1fr 1fr;
    }

    .export-bar {
        flex-direction: column;
    }

    .btn-export {
        min-width: unset;
    }

    .field-row {
        grid-template-columns: 1fr;
    }
}