/* -------------------------------------------------------------
 * QRQR PRO - Modern & Premium Design System
 * Glassmorphism, Dark/Light Mode, Responsive Grid
 * ------------------------------------------------------------- */

/* 1. Global Reset & Theme Variables */
:root {
    --bg-color: #0d0f17;
    --card-bg: rgba(22, 26, 43, 0.65);
    --card-border: rgba(255, 255, 255, 0.08);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --primary-neon: #6366f1;
    --primary-neon-glow: rgba(99, 102, 241, 0.4);
    --secondary-neon: #a855f7;
    --secondary-neon-glow: rgba(168, 85, 247, 0.4);
    --accent-red: #ef4444;
    --input-bg: rgba(13, 15, 23, 0.8);
    --input-border: rgba(255, 255, 255, 0.1);
    --tab-inactive: rgba(255, 255, 255, 0.05);
    
    --glass-blur: blur(16px);
    --transition-speed: 0.3s;
}

[data-theme="light"] {
    --bg-color: #f1f5f9;
    --card-bg: rgba(255, 255, 255, 0.75);
    --card-border: rgba(0, 0, 0, 0.06);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --primary-neon: #4f46e5;
    --primary-neon-glow: rgba(79, 70, 229, 0.2);
    --secondary-neon: #9333ea;
    --secondary-neon-glow: rgba(147, 51, 234, 0.2);
    --input-bg: rgba(255, 255, 255, 0.9);
    --input-border: rgba(0, 0, 0, 0.1);
    --tab-inactive: rgba(0, 0, 0, 0.03);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    position: relative;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* Background Glowing Effect */
.glass-bg {
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--primary-neon-glow) 0%, rgba(0,0,0,0) 70%);
    top: -100px;
    right: -100px;
    z-index: -1;
    pointer-events: none;
    filter: blur(80px);
}

/* 2. Header Style */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--card-border);
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(13, 15, 23, 0.4);
}

[data-theme="light"] .app-header {
    background: rgba(241, 245, 249, 0.4);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.neon-icon {
    color: var(--primary-neon);
    text-shadow: 0 0 10px var(--primary-neon-glow);
}

.badge {
    font-size: 0.65rem;
    padding: 0.15rem 0.5rem;
    background: linear-gradient(135deg, var(--primary-neon), var(--secondary-neon));
    border-radius: 99px;
    color: white;
    vertical-align: middle;
    margin-left: 0.25rem;
    font-weight: 600;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.lang-select-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 0.5rem 1rem;
    gap: 0.5rem;
    transition: all 0.2s ease;
}

.lang-select-wrapper:hover {
    border-color: var(--primary-neon);
}

.lang-icon {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

#lang-select {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.85rem;
    outline: none;
    cursor: pointer;
    padding-right: 0.5rem;
}

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

.btn-icon {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    color: var(--text-primary);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.btn-icon:hover {
    transform: scale(1.05);
    border-color: var(--primary-neon);
    box-shadow: 0 0 15px var(--primary-neon-glow);
}

/* 3. Main Container & Grid Layout */
.app-container {
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    padding: 2rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.grid-layout {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 2rem;
}

@media (max-width: 1024px) {
    .grid-layout {
        grid-template-columns: 1fr;
    }
    .sticky-card {
        position: static !important;
    }
}

/* 4. Panels & Cards (Glassmorphism) */
.panel-card {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 2.25rem;
    backdrop-filter: var(--glass-blur);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-bottom: 2rem;
}

.control-panel {
    display: flex;
    flex-direction: column;
}

.sticky-card {
    position: sticky;
    top: 100px;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--card-border);
}

.section-title i {
    color: var(--primary-neon);
}

/* 5. Inputs & Form Fields */
.input-tabs {
    display: flex;
    background-color: var(--tab-inactive);
    padding: 0.25rem;
    border-radius: 12px;
    border: 1px solid var(--input-border);
}

.tab-btn {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 0.75rem 1rem;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
}

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

.tab-btn.active {
    background-color: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--card-border);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.tab-content {
    animation: fadeIn 0.4s ease;
}

.tab-content.hidden {
    display: none;
}

.input-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
}

@media (max-width: 600px) {
    .input-grid {
        grid-template-columns: 1fr;
    }
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.input-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.input-group input[type="text"],
.input-group input[type="password"],
.input-group input[type="email"],
.input-group select {
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--text-primary);
    padding: 0.85rem 1.2rem;
    border-radius: 12px;
    outline: none;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.input-group input:focus,
.input-group select:focus {
    border-color: var(--primary-neon);
    box-shadow: 0 0 0 3px var(--primary-neon-glow);
}

/* Color Picker Custom styling */
.color-picker-wrapper {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.color-picker-wrapper input[type="color"] {
    -webkit-appearance: none;
    border: none;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    cursor: pointer;
    background: none;
}

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

.color-picker-wrapper input[type="color"]::-webkit-color-swatch {
    border: 1px solid var(--input-border);
    border-radius: 12px;
}

.color-picker-wrapper input[type="text"] {
    width: 100px;
    text-align: center;
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--text-primary);
    padding: 0.85rem;
    border-radius: 12px;
    font-family: monospace;
    font-size: 0.9rem;
}

.checkbox-inline {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
    margin-left: 0.5rem;
}

.sub-section {
    border-top: 1px solid var(--card-border);
    padding-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.sub-section h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.color-mode-select {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 0.5rem;
}

.color-mode-select label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.hidden {
    display: none !important;
}

/* Logo Upload Custom UI */
.logo-upload-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.logo-upload-label {
    border: 2px dashed var(--input-border);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.logo-upload-label:hover {
    border-color: var(--primary-neon);
    background-color: var(--tab-inactive);
    color: var(--text-primary);
}

.logo-upload-label i {
    font-size: 1.75rem;
}

#logo-preview-area {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 12px;
}

#logo-filename {
    font-size: 0.85rem;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 70%;
}

.logo-control {
    margin-top: 1rem;
}

/* Range input styling */
input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    background: transparent;
}

input[type="range"]:focus {
    outline: none;
}

input[type="range"]::-webkit-slider-runnable-track {
    width: 100%;
    height: 6px;
    cursor: pointer;
    background: var(--input-border);
    border-radius: 3px;
}

input[type="range"]::-webkit-slider-thumb {
    height: 18px;
    width: 18px;
    border-radius: 50%;
    background: var(--primary-neon);
    cursor: pointer;
    -webkit-appearance: none;
    margin-top: -6px;
    box-shadow: 0 0 10px var(--primary-neon-glow);
}

/* 6. Preview & Output Area */
.qr-preview-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 16px;
    padding: 2rem;
    min-height: 320px;
    position: relative;
    overflow: hidden;
}

#canvas-container {
    background-color: white;
    padding: 1.5rem;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.3s ease;
}

/* Buttons style */
.download-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

button {
    font-family: inherit;
    font-weight: 700;
    font-size: 0.95rem;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-neon), var(--secondary-neon));
    color: white;
    box-shadow: 0 4px 15px var(--primary-neon-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--primary-neon-glow);
}

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

.btn-secondary:hover {
    background-color: var(--tab-inactive);
    border-color: var(--text-secondary);
}

.btn-small {
    padding: 0.4rem 0.8rem;
    font-size: 0.75rem;
    border-radius: 6px;
    background-color: var(--accent-red);
    color: white;
}

.tips-box {
    background-color: rgba(99, 102, 241, 0.05);
    border-left: 4px solid var(--primary-neon);
    padding: 1rem 1.25rem;
    border-radius: 0 12px 12px 0;
}

.tips-box h4 {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--primary-neon);
    margin-bottom: 0.4rem;
}

.tips-box ul {
    list-style-type: none;
    padding-left: 0;
}

.tips-box li {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.4;
    position: relative;
    padding-left: 0.75rem;
}

.tips-box li::before {
    content: "•";
    color: var(--primary-neon);
    position: absolute;
    left: 0;
}

/* 7. AdSense & Placeholders */
.adsense-slot {
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(255, 255, 255, 0.02);
    border: 1px dashed rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 1rem;
    margin: 1rem 0;
    min-height: 100px;
    transition: all 0.3s ease;
}

[data-theme="light"] .adsense-slot {
    background: rgba(0, 0, 0, 0.01);
    border: 1px dashed rgba(0, 0, 0, 0.05);
}

.ads-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    color: var(--text-secondary);
    font-size: 0.8rem;
    opacity: 0.6;
}

.ads-placeholder i {
    font-size: 1.25rem;
}

.banner-top {
    min-height: 90px;
    width: 100%;
}

.banner-bottom {
    min-height: 100px;
    width: 100%;
    margin-top: 2rem;
}

.sidebar-ad {
    min-height: 250px;
    margin-top: 1.5rem;
}

/* 8. Footer Style */
.app-footer {
    backdrop-filter: var(--glass-blur);
    border-top: 1px solid var(--card-border);
    padding: 2rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    background: rgba(13, 15, 23, 0.4);
    margin-top: auto;
}

[data-theme="light"] .app-footer {
    background: rgba(241, 245, 249, 0.4);
}

.app-footer p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--primary-neon);
    font-size: 0.85rem;
    text-decoration: none;
    font-weight: 500;
}

.footer-links a:hover {
    text-decoration: underline;
}

}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ---------------------------------------------------------------
 * FAQ Section
 * --------------------------------------------------------------- */
.faq-section {
    max-width: 900px;
    margin: 0 auto 40px;
    padding: 0 16px;
}

.faq-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--card-border);
}

.faq-item {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    margin-bottom: 10px;
    overflow: hidden;
    transition: border-color var(--transition-speed);
}

.faq-item:hover {
    border-color: var(--primary-neon);
}

.faq-item summary {
    padding: 16px 20px;
    font-size: 0.97rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
    content: '+';
    font-size: 1.3rem;
    color: var(--primary-neon);
    transition: transform var(--transition-speed);
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-item p {
    padding: 0 20px 16px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}