/* ===== CSS Variables — Dark Theme ===== */
:root {
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #22223b;
    --bg-card: #1e1e32;
    --bg-input: #252540;
    --border-color: #2d2d4a;
    --border-light: #3a3a5c;

    --text-primary: #e8e8f0;
    --text-secondary: #a0a0b8;
    --text-muted: #6c6c88;

    --accent: #6C5CE7;
    --accent-hover: #7d6ff0;
    --accent-glow: rgba(108, 92, 231, 0.35);
    --accent-secondary: #fd79a8;
    --success: #00b894;
    --danger: #e74c3c;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 30px var(--accent-glow);

    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ===== Header ===== */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 32px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    font-size: 1.6rem;
    color: var(--accent);
    filter: drop-shadow(0 0 8px var(--accent-glow));
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--text-primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.tab-nav {
    display: flex;
    gap: 6px;
    background: var(--bg-input);
    padding: 4px;
    border-radius: var(--radius-lg);
}

.tab-btn {
    padding: 10px 22px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
}

.tab-btn:hover { color: var(--text-primary); }

.tab-btn.active {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 2px 12px var(--accent-glow);
}

/* ===== Main ===== */
.app-main {
    max-width: 1280px;
    margin: 0 auto;
    padding: 28px 24px;
}

.tab-panel { display: none; animation: fadeUp 0.35s ease; }
.tab-panel.active { display: block; }

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== Create Layout ===== */
.panel-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
    align-items: start;
}

@media (max-width: 900px) {
    .panel-layout { grid-template-columns: 1fr; }
}

.controls-column {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* ===== Control Groups ===== */
.control-group {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 18px;
    transition: border-color var(--transition);
}

.control-group:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.control-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 10px;
}

.control-input {
    width: 100%;
    padding: 11px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.9rem;
    transition: var(--transition);
    outline: none;
}

.control-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

textarea.control-input { resize: vertical; min-height: 70px; }

select.control-input {
    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 12 12'%3E%3Cpath fill='%23a0a0b8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
}

/* ===== Type Selector ===== */
.type-selector {
    display: flex;
    gap: 4px;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.type-btn {
    padding: 6px 14px;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font);
    font-size: 0.78rem;
    font-weight: 500;
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
}

.type-btn:hover { border-color: var(--accent); color: var(--text-primary); }

.type-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

/* ===== Sub Forms ===== */
.sub-form {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 10px;
    animation: fadeUp 0.25s ease;
}

.sub-form.hidden { display: none; }

/* ===== Color Fields ===== */
.color-row {
    display: flex;
    gap: 12px;
    margin-bottom: 10px;
}

.color-field {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.color-field span {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

.color-field input[type="color"] {
    width: 100%;
    height: 38px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-input);
    cursor: pointer;
    padding: 2px;
}

.color-field input[type="color"]::-webkit-color-swatch-wrapper { padding: 2px; }
.color-field input[type="color"]::-webkit-color-swatch { border-radius: 4px; border: none; }

/* ===== Toggle ===== */
.toggle-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.toggle-input { display: none; }

.toggle-label {
    position: relative;
    padding-left: 48px;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text-secondary);
    user-select: none;
}

.toggle-label::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 36px;
    height: 20px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    transition: var(--transition);
}

.toggle-label::after {
    content: '';
    position: absolute;
    left: 3px;
    top: 50%;
    transform: translateY(-50%);
    width: 14px;
    height: 14px;
    background: var(--text-muted);
    border-radius: 50%;
    transition: var(--transition);
}

.toggle-input:checked + .toggle-label::before {
    background: var(--accent);
    border-color: var(--accent);
}

.toggle-input:checked + .toggle-label::after {
    left: 19px;
    background: #fff;
}

/* ===== File Upload ===== */
.file-upload {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.file-name {
    font-size: 0.78rem;
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 140px;
}

/* ===== Range ===== */
.range-input {
    width: 100%;
    height: 6px;
    background: var(--bg-input);
    border-radius: 3px;
    outline: none;
    appearance: none;
    cursor: pointer;
}

.range-input::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px var(--accent-glow);
    transition: transform var(--transition);
}

.range-input::-webkit-slider-thumb:hover { transform: scale(1.15); }

/* ===== Preview ===== */
.preview-column {
    position: sticky;
    top: 100px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.preview-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 380px;
    background-image:
        radial-gradient(circle at 20% 20%, rgba(108,92,231,0.06) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(253,121,168,0.06) 0%, transparent 50%);
}

.qr-preview {
    display: flex;
    align-items: center;
    justify-content: center;
    filter: drop-shadow(0 8px 24px rgba(0,0,0,0.5));
}

.qr-preview canvas, .qr-preview svg {
    border-radius: var(--radius-md);
    max-width: 100%;
    height: auto;
}

.action-row {
    display: flex;
    gap: 10px;
}

.action-row .btn { flex: 1; }

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 11px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 4px 16px var(--accent-glow);
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 24px var(--accent-glow);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-light);
    color: var(--text-primary);
}

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(108,92,231,0.08);
}

.btn-danger {
    background: transparent;
    border: 1px solid var(--danger);
    color: var(--danger);
}

.btn-danger:hover { background: rgba(231,76,60,0.12); }

.btn-sm { padding: 7px 14px; font-size: 0.8rem; }

.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none !important; }

/* ===== Scan Layout ===== */
.scan-layout {
    max-width: 680px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.scan-controls {
    display: flex;
    justify-content: center;
}

.scan-mode-toggle {
    display: flex;
    gap: 4px;
    background: var(--bg-input);
    padding: 4px;
    border-radius: var(--radius-lg);
}

.scan-mode-btn {
    padding: 9px 24px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

.scan-mode-btn:hover { color: var(--text-primary); }

.scan-mode-btn.active {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 2px 12px var(--accent-glow);
}

.scan-mode-panel { display: none; }
.scan-mode-panel.active { display: block; animation: fadeUp 0.3s ease; }

.qr-reader {
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    min-height: 300px;
}

.qr-reader video { border-radius: var(--radius-lg); }

.scan-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 16px;
}

/* ===== Drop Zone ===== */
.file-drop-zone {
    border: 2px dashed var(--border-light);
    border-radius: var(--radius-xl);
    padding: 60px 32px;
    text-align: center;
    transition: var(--transition);
    background: var(--bg-card);
    cursor: pointer;
}

.file-drop-zone.dragover {
    border-color: var(--accent);
    background: rgba(108,92,231,0.08);
    box-shadow: 0 0 30px var(--accent-glow);
}

.drop-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 12px;
    color: var(--accent);
    opacity: 0.7;
}

.drop-content p {
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.drop-sub {
    font-size: 0.8rem !important;
    color: var(--text-muted) !important;
    margin: 12px 0 !important;
}

/* ===== Scan Result ===== */
.scan-result {
    background: var(--bg-card);
    border: 1px solid var(--success);
    border-radius: var(--radius-lg);
    padding: 20px;
    animation: fadeUp 0.3s ease;
    box-shadow: 0 0 24px rgba(0,184,148,0.15);
}

.scan-result.hidden { display: none; }

.result-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
}

.result-badge {
    color: var(--success);
    font-weight: 700;
    font-size: 0.9rem;
}

.result-text {
    word-break: break-all;
    background: var(--bg-input);
    padding: 14px;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: 14px;
    border: 1px solid var(--border-color);
}

.result-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* ===== Toast ===== */
.toast {
    position: fixed;
    bottom: 28px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 12px 24px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
    font-size: 0.875rem;
    font-weight: 500;
    opacity: 0;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 9999;
    pointer-events: none;
}

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

.toast.success { border-color: var(--success); color: var(--success); }
.toast.error { border-color: var(--danger); color: var(--danger); }

/* ===== Preset Grid ===== */
.preset-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

@media (max-width: 500px) {
    .preset-grid { grid-template-columns: repeat(2, 1fr); }
}

.preset-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 10px 8px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font);
}

.preset-btn:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.preset-btn.active {
    border-color: var(--accent);
    background: rgba(108, 92, 231, 0.12);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.preset-swatches {
    display: flex;
    gap: 3px;
}

.preset-swatches span {
    width: 16px;
    height: 16px;
    border-radius: 4px;
    border: 1px solid rgba(255,255,255,0.12);
}

.preset-name {
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.02em;
}

.preset-btn.active .preset-name {
    color: var(--text-primary);
    font-weight: 600;
}

/* ===== Utilities ===== */
.hidden { display: none !important; }

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ===== Responsive ===== */
@media (max-width: 600px) {
    .app-header {
        flex-direction: column;
        gap: 12px;
        padding: 14px 16px;
    }

    .app-main { padding: 16px; }

    .preview-card { min-height: 280px; padding: 20px; }

    .scan-layout { padding: 0; }
}

.adjust-info {
    margin-top: 10px;
    padding: 10px 12px;
    background: rgba(108, 92, 231, 0.08);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.adjust-info .swatch {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 3px;
    vertical-align: middle;
    margin: 0 4px 0 2px;
    border: 1px solid rgba(255,255,255,0.15);
}

.adjust-info.hidden { display: none; }