/* CSS Variables & Theming */
:root {
    --bg-gradient: linear-gradient(135deg, #e0c3fc 0%, #8ec5fc 100%);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.4);
    --text-main: #1e293b;
    --text-muted: #64748b;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --danger: #ef4444;
    --success: #10b981;
    --card-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
    --input-bg: rgba(255, 255, 255, 0.9);
    --border-color: #cbd5e1;
}

[data-theme="dark"] {
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
    --glass-bg: rgba(15, 23, 42, 0.75);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --primary: #6366f1;
    --primary-hover: #818cf8;
    --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
    --input-bg: rgba(30, 41, 59, 0.9);
    --border-color: #334155;
}

/* Reset & Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
    transition: background-color 0.3s, color 0.3s;
}

body {
    background: var(--bg-gradient);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

/* Top Navigation / Controls */
.top-nav {
    position: absolute;
    top: 1rem;
    right: 1rem;
}

.icon-btn {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--card-shadow);
    font-size: 1.2rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.icon-btn:hover {
    transform: scale(1.05);
}

/* Main App Container */
.app-container {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 2.5rem;
    width: 100%;
    max-width: 500px;
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    z-index: 10;
}

.header {
    text-align: center;
}

.header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.header p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Input Group */
.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-wrapper i {
    position: absolute;
    left: 1rem;
    color: var(--text-muted);
}

input[type="url"] {
    width: 100%;
    padding: 1rem 1rem 1rem 2.75rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: var(--input-bg);
    color: var(--text-main);
    font-size: 1rem;
    outline: none;
}

input[type="url"]:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

.btn-primary {
    background: var(--primary);
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    min-height: 48px; /* Touch-friendly */
}

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

.btn-primary:active {
    transform: translateY(2px);
}

.error-msg {
    color: var(--danger);
    font-size: 0.85rem;
    margin-top: -0.5rem;
    display: none;
}

/* Settings Group (Bonus Feature) */
.settings-group {
    display: flex;
    gap: 1rem;
    background: rgba(0,0,0,0.05);
    padding: 1rem;
    border-radius: 12px;
    flex-wrap: wrap;
}

[data-theme="dark"] .settings-group { background: rgba(255,255,255,0.05); }

.setting-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: 120px;
}

.setting-item label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
}

input[type="color"] {
    width: 100%;
    height: 36px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    background: transparent;
}

input[type="range"] {
    width: 100%;
    accent-color: var(--primary);
}

/* Loading Spinner */
.loader {
    display: none;
    border: 4px solid var(--glass-border);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* Output Section */
.output-section {
    display: none; /* Hidden until generated */
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    animation: fadeIn 0.4s ease-out forwards;
}

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

.qr-wrapper {
    background: #ffffff; /* QR background should be white by default to contrast the image */
    padding: 1rem;
    border-radius: 16px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

/* This container targets the qrcodejs output */
#qrcode {
    display: flex;
    justify-content: center;
    align-items: center;
}

#qrcode img, #qrcode canvas {
    max-width: 100%;
    height: auto !important; /* overrides inline styles for responsiveness */
}

.preview-info {
    text-align: center;
    width: 100%;
}

.preview-url {
    font-size: 0.9rem;
    color: var(--text-main);
    word-break: break-all;
    background: rgba(0,0,0,0.05);
    padding: 0.5rem;
    border-radius: 8px;
    margin-bottom: 0.5rem;
}

[data-theme="dark"] .preview-url { background: rgba(255,255,255,0.05); }

.stats {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    justify-content: space-around;
}

/* Action Buttons */
.action-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    width: 100%;
}

.btn-action {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--text-main);
    padding: 0.75rem;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.2s;
    min-height: 48px;
}

.btn-action:hover {
    background: var(--primary);
    color: white;
}

/* Social Share */
.share-row {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    width: 100%;
    flex-wrap: wrap;
}

.share-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: transform 0.2s;
}

.share-btn:hover { transform: translateY(-3px); }
.bg-x { background: #000000; }
.bg-fb { background: #1877F2; }
.bg-wa { background: #25D366; }
.bg-li { background: #0A66C2; }
.bg-share { background: var(--text-muted); }

/* Print Styles - Only print the QR Code */
@media print {
    body * { visibility: hidden; }
    .qr-wrapper, .qr-wrapper * { visibility: visible; }
    .qr-wrapper {
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        box-shadow: none;
        border: none;
    }
}

/* Responsive */
@media (max-width: 480px) {
    .app-container {
        padding: 1.5rem;
        border-radius: 16px;
        border: none;
        box-shadow: none;
        background: transparent;
        backdrop-filter: none;
    }
    body { padding: 0; }
    .top-nav { position: relative; display: flex; justify-content: flex-end; width: 100%; padding: 1rem 1rem 0; }
}