:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg-color: #0f172a;
    --panel-bg: rgba(30, 41, 59, 0.7);
    --panel-border: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --input-bg: rgba(15, 23, 42, 0.6);
    --input-border: rgba(255, 255, 255, 0.2);
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-color);
    background-image: radial-gradient(at 0% 0%, hsla(253,16%,7%,1) 0, transparent 50%), radial-gradient(at 50% 0%, hsla(225,39%,30%,1) 0, transparent 50%), radial-gradient(at 100% 0%, hsla(339,49%,30%,1) 0, transparent 50%);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.app-container {
    max-width: 1000px;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

header {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
}

header .logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary);
}

main {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: 2rem;
}

@media (max-width: 768px) {
    main {
        grid-template-columns: 1fr;
    }
}

.glass-panel {
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--panel-border);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--panel-border);
    padding-bottom: 1rem;
}

.tab-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: color 0.3s ease;
    position: relative;
}

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

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

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -17px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
}

.tab-content {
    display: none;
    animation: fadeIn 0.4s ease;
}

.tab-content.active {
    display: block;
}

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

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

input, textarea {
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.3s ease;
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

input[type="file"] {
    padding: 0.5rem;
}

input[type="file"]::file-selector-button {
    background: var(--primary);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: background 0.3s;
    margin-right: 1rem;
}

input[type="file"]::file-selector-button:hover {
    background: var(--primary-hover);
}

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

.full-width {
    grid-column: 1 / -1;
}

.color-picker-wrapper {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 8px;
    padding: 0.5rem;
}

input[type="color"] {
    -webkit-appearance: none;
    border: none;
    width: 32px;
    height: 32px;
    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: 4px;
}

.color-hex {
    font-family: monospace;
    font-size: 0.875rem;
}

button {
    font-family: inherit;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    border-radius: 8px;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    font-size: 1rem;
    width: 100%;
}

button:active {
    transform: scale(0.98);
}

.primary-btn {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 6px rgba(99, 102, 241, 0.3);
}

.primary-btn:hover {
    background: var(--primary-hover);
    box-shadow: 0 6px 12px rgba(99, 102, 241, 0.4);
}

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

.secondary-btn:hover {
    background: rgba(255, 255, 255, 0.05);
}

.preview-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.preview-header {
    width: 100%;
    text-align: left;
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 2rem;
}

.preview-container {
    width: 300px;
    height: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--input-bg);
    border: 1px dashed var(--input-border);
    border-radius: 12px;
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
}

#qr-preview {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

#empty-state, #loading {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.hidden {
    display: none !important;
}

.actions {
    display: flex;
    gap: 1rem;
    width: 100%;
}

/* QR Type Selector Styles */
.type-btn {
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.type-btn:hover {
    background: rgba(255, 255, 255, 0.08) !important;
    color: var(--text-primary) !important;
    border-color: rgba(255, 255, 255, 0.2) !important;
}

.type-btn.active {
    background: var(--primary) !important;
    color: white !important;
    border-color: var(--primary) !important;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.type-form select {
    outline: none;
}

.type-form select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}