/* =========================================
   QR Code Generator - Custom Styles
   AdSense-safe: class-scoped selectors only
   ========================================= */

:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #dbeafe;
    --color-secondary: #0f172a;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-bg: #f8fafc;
    --color-white: #ffffff;
    --color-border: #e2e8f0;
    --color-success: #16a34a;
    --color-error: #dc2626;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --container-max: 1200px;
    --header-height: 64px;
}

/* Reset - scoped to avoid affecting AdSense */
html { box-sizing: border-box; }
.site-header, .site-header *, .site-main, .site-main *, .site-footer, .site-footer * { box-sizing: border-box; }
body {
    margin: 0;
    padding: 0;
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-dark); }

.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 20px;
}

/* =================== HEADER =================== */
.site-header {
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-height);
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}
.site-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-secondary);
    text-decoration: none;
}
.site-logo:hover { color: var(--color-primary); }

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-secondary);
    border-radius: 2px;
    transition: transform 0.3s, opacity 0.3s;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.main-nav {
    display: flex;
    align-items: center;
    gap: 4px;
}
.nav-group { position: relative; }
.nav-group-toggle {
    display: flex;
    align-items: center;
    gap: 4px;
    background: none;
    border: none;
    padding: 8px 14px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    cursor: pointer;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    transition: background 0.2s;
}
.nav-group-toggle:hover { background: var(--color-bg); }
.nav-group-toggle svg { transition: transform 0.2s; }
.nav-group-toggle[aria-expanded="true"] svg { transform: rotate(180deg); }

.nav-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    min-width: 160px;
    padding: 6px;
    z-index: 110;
}
.nav-dropdown.show { display: block; }
.nav-dropdown a {
    display: block;
    padding: 8px 14px;
    color: var(--color-text);
    font-size: 0.875rem;
    border-radius: var(--radius-sm);
    transition: background 0.15s;
}
.nav-dropdown a:hover {
    background: var(--color-primary-light);
    color: var(--color-primary);
}
.nav-link {
    padding: 8px 14px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    border-radius: var(--radius-sm);
    transition: background 0.2s;
}
.nav-link:hover { background: var(--color-bg); color: var(--color-primary); }

/* =================== MAIN =================== */
.site-main {
    min-height: calc(100vh - var(--header-height) - 200px);
    padding-bottom: 60px;
}

/* =================== HERO =================== */
.hero {
    text-align: center;
    padding: 60px 20px 40px;
}
.hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-secondary);
    margin: 0 0 16px;
    line-height: 1.2;
}
.hero p {
    font-size: 1.15rem;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto 30px;
}

/* =================== QR TYPE CARDS (Homepage) =================== */
.qr-types-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
    padding: 0 20px 40px;
    max-width: var(--container-max);
    margin: 0 auto;
}
.qr-type-card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    text-decoration: none;
    color: var(--color-text);
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.qr-type-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
    color: var(--color-text);
}
.qr-type-card .card-icon {
    width: 48px;
    height: 48px;
    background: var(--color-primary-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
}
.qr-type-card .card-icon svg { width: 24px; height: 24px; }
.qr-type-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0;
    color: var(--color-secondary);
}
.qr-type-card p {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin: 0;
    line-height: 1.5;
}

/* =================== HOW IT WORKS =================== */
.how-it-works {
    background: var(--color-white);
    padding: 60px 20px;
    margin: 0;
}
.how-it-works h2, .features-section h2, .faq-section h2 {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-secondary);
    margin: 0 0 40px;
}
.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    max-width: var(--container-max);
    margin: 0 auto;
}
.step-item {
    text-align: center;
    padding: 20px;
}
.step-number {
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 16px;
}
.step-item h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0 0 8px;
    color: var(--color-secondary);
}
.step-item p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin: 0;
}

/* =================== FEATURES =================== */
.features-section {
    padding: 60px 20px;
    max-width: var(--container-max);
    margin: 0 auto;
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 24px;
}
.feature-item {
    padding: 24px;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}
.feature-item h3 {
    font-size: 1rem;
    font-weight: 600;
    margin: 12px 0 8px;
    color: var(--color-secondary);
}
.feature-item p {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin: 0;
}
.feature-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
}

/* =================== FAQ =================== */
.faq-section {
    padding: 60px 20px;
    max-width: 800px;
    margin: 0 auto;
}
.faq-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    background: var(--color-white);
    overflow: hidden;
}
.faq-question {
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    padding: 18px 20px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-secondary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-sans);
}
.faq-question:hover { background: var(--color-bg); }
.faq-question svg { transition: transform 0.2s; flex-shrink: 0; margin-left: 12px; }
.faq-question[aria-expanded="true"] svg { transform: rotate(180deg); }
.faq-answer {
    display: none;
    padding: 0 20px 18px;
    font-size: 0.9rem;
    color: var(--color-text-light);
    line-height: 1.7;
}
.faq-answer.show { display: block; }

/* =================== QR TYPE PAGE LAYOUT =================== */
.qr-page { padding: 40px 20px 0; max-width: var(--container-max); margin: 0 auto; }
.qr-page-header { text-align: center; margin-bottom: 36px; }
.qr-page-header h1 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-secondary);
    margin: 0 0 12px;
}
.qr-page-header p {
    font-size: 1.05rem;
    color: var(--color-text-light);
    max-width: 650px;
    margin: 0 auto;
    line-height: 1.6;
}
.qr-generator-layout {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 32px;
    align-items: start;
}

/* =================== FORM STYLES =================== */
.qr-form-card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
}
.qr-form-card h2 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-secondary);
    margin: 0 0 20px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--color-border);
}
.form-group {
    margin-bottom: 18px;
}
.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 6px;
}
.form-group input[type="text"],
.form-group input[type="url"],
.form-group input[type="email"],
.form-group input[type="tel"],
.form-group input[type="number"],
.form-group input[type="datetime-local"],
.form-group input[type="date"],
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px 14px;
    font-size: 0.9rem;
    font-family: var(--font-sans);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-white);
    color: var(--color-text);
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
}
.form-group textarea { min-height: 80px; resize: vertical; }
.form-group input::placeholder,
.form-group textarea::placeholder {
    color: #94a3b8;
}
.form-hint {
    font-size: 0.8rem;
    color: var(--color-text-light);
    margin-top: 4px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

/* Checkbox */
.form-check {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 18px;
}
.form-check input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--color-primary);
    cursor: pointer;
}
.form-check label {
    font-size: 0.9rem;
    color: var(--color-text);
    cursor: pointer;
    margin-bottom: 0;
}

/* Color pickers */
.color-pickers {
    display: flex;
    gap: 16px;
    margin-bottom: 18px;
}
.color-picker-group {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
}
.color-picker-group label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text);
    white-space: nowrap;
}
.color-picker-group input[type="color"] {
    width: 40px;
    height: 36px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    padding: 2px;
    background: var(--color-white);
}

/* ECC and size */
.options-row {
    display: flex;
    gap: 14px;
    margin-bottom: 18px;
}
.options-row .form-group { flex: 1; margin-bottom: 0; }

/* Logo upload */
.logo-upload-area {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-md);
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    margin-bottom: 18px;
    position: relative;
}
.logo-upload-area:hover { border-color: var(--color-primary); background: var(--color-primary-light); }
.logo-upload-area input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}
.logo-upload-area p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--color-text-light);
}
.logo-upload-area .upload-icon {
    color: var(--color-primary);
    margin-bottom: 8px;
}
.logo-preview {
    display: none;
    margin-top: 10px;
    text-align: center;
}
.logo-preview img {
    max-width: 80px;
    max-height: 80px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}
.logo-preview .remove-logo {
    display: inline-block;
    margin-top: 6px;
    font-size: 0.8rem;
    color: var(--color-error);
    cursor: pointer;
    background: none;
    border: none;
    font-family: var(--font-sans);
}

/* Generate button */
.btn-generate {
    width: 100%;
    padding: 14px;
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-sans);
    color: var(--color-white);
    background: var(--color-primary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}
.btn-generate:hover { background: var(--color-primary-dark); }
.btn-generate:active { transform: scale(0.98); }
.btn-generate:disabled { opacity: 0.6; cursor: not-allowed; }

/* =================== QR PREVIEW PANEL =================== */
.qr-preview-card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 28px;
    text-align: center;
    position: sticky;
    top: calc(var(--header-height) + 20px);
}
.qr-preview-card h2 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-secondary);
    margin: 0 0 20px;
}
.qr-preview-image {
    width: 100%;
    max-width: 280px;
    margin: 0 auto 20px;
    aspect-ratio: 1;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border: 1px solid var(--color-border);
}
.qr-preview-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}
.qr-placeholder {
    color: var(--color-text-light);
    font-size: 0.875rem;
}
.qr-placeholder svg { display: block; margin: 0 auto 8px; opacity: 0.4; }

.download-buttons {
    display: flex;
    gap: 10px;
}
.btn-download {
    flex: 1;
    padding: 10px 16px;
    font-size: 0.875rem;
    font-weight: 600;
    font-family: var(--font-sans);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    border: none;
    text-align: center;
}
.btn-download:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-download-png {
    background: var(--color-primary);
    color: var(--color-white);
}
.btn-download-png:hover:not(:disabled) { background: var(--color-primary-dark); }
.btn-download-svg {
    background: var(--color-white);
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}
.btn-download-svg:hover:not(:disabled) { background: var(--color-primary-light); }

/* =================== CONTENT SECTIONS =================== */
.qr-info-section {
    max-width: var(--container-max);
    margin: 40px auto 0;
    padding: 0 20px;
}
.info-card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px;
    margin-bottom: 24px;
}
.info-card h2 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-secondary);
    margin: 0 0 16px;
}
.info-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-secondary);
    margin: 20px 0 8px;
}
.info-card p, .info-card li {
    font-size: 0.925rem;
    color: var(--color-text-light);
    line-height: 1.7;
    margin: 0 0 12px;
}
.info-card ul, .info-card ol {
    padding-left: 20px;
    margin: 0 0 12px;
}
.info-card ol li { margin-bottom: 8px; }

/* Steps list */
.usage-steps { counter-reset: step; list-style: none; padding-left: 0; }
.usage-steps li {
    counter-increment: step;
    padding: 12px 0 12px 48px;
    position: relative;
    border-bottom: 1px solid var(--color-border);
}
.usage-steps li:last-child { border-bottom: none; }
.usage-steps li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 12px;
    width: 32px;
    height: 32px;
    background: var(--color-primary-light);
    color: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
}

/* Related QR types */
.related-types {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 16px;
}
.related-type-link {
    padding: 8px 16px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text);
    transition: background 0.2s, border-color 0.2s;
}
.related-type-link:hover {
    background: var(--color-primary-light);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* =================== FOOTER =================== */
.site-footer {
    background: var(--color-secondary);
    color: #94a3b8;
    padding: 48px 0 0;
    margin-top: 60px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
}
.footer-col h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-white);
    margin: 0 0 16px;
}
.footer-col a {
    display: block;
    color: #94a3b8;
    font-size: 0.875rem;
    padding: 4px 0;
    transition: color 0.2s;
}
.footer-col a:hover { color: var(--color-white); }
.footer-links-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding: 20px 0;
    text-align: center;
}
.footer-bottom p {
    margin: 0;
    font-size: 0.8rem;
    color: #64748b;
    line-height: 1.6;
}

/* =================== ABOUT / PRIVACY PAGES =================== */
.page-content {
    max-width: 800px;
    margin: 40px auto 0;
    padding: 0 20px;
}
.page-content h1 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-secondary);
    margin: 0 0 20px;
}
.page-content h2 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-secondary);
    margin: 28px 0 12px;
}
.page-content p {
    font-size: 0.95rem;
    color: var(--color-text-light);
    line-height: 1.7;
    margin: 0 0 16px;
}
.page-content ul, .page-content ol {
    padding-left: 20px;
    margin: 0 0 16px;
}
.page-content li {
    font-size: 0.95rem;
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: 6px;
}

/* =================== LOADING SPINNER =================== */
.spinner {
    display: none;
    width: 24px;
    height: 24px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    margin: 0 auto;
}
.spinner.show { display: inline-block; }
@@keyframes spin { to { transform: rotate(360deg); } }

/* =================== RESPONSIVE =================== */
@@media (max-width: 1024px) {
    .qr-generator-layout {
        grid-template-columns: 1fr;
    }
    .qr-preview-card {
        position: static;
        max-width: 420px;
        margin: 0 auto;
    }
}

@@media (max-width: 768px) {
    .hero h1 { font-size: 1.8rem; }
    .hero p { font-size: 1rem; }
    .steps-grid { grid-template-columns: 1fr; gap: 16px; }
    .qr-types-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 14px; }
    .form-row { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .footer-links-grid { grid-template-columns: repeat(2, 1fr); }
    .qr-page-header h1 { font-size: 1.6rem; }

    .nav-toggle { display: flex; }
    .main-nav {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--color-white);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
        flex-direction: column;
        padding: 12px;
        gap: 0;
    }
    .main-nav.show { display: flex; }
    .nav-group { width: 100%; }
    .nav-group-toggle { width: 100%; justify-content: space-between; padding: 12px 14px; }
    .nav-dropdown {
        position: static;
        box-shadow: none;
        border: none;
        padding: 0 0 0 16px;
    }
    .nav-link { display: block; padding: 12px 14px; width: 100%; }
}

@@media (max-width: 480px) {
    .hero h1 { font-size: 1.5rem; }
    .qr-form-card { padding: 20px; }
    .qr-preview-card { padding: 20px; }
    .info-card { padding: 24px; }
    .color-pickers { flex-direction: column; gap: 10px; }
    .options-row { flex-direction: column; }
    .qr-types-grid { grid-template-columns: 1fr 1fr; }
    .download-buttons { flex-direction: column; }
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
}

html {
  position: relative;
  min-height: 100%;
}

body {
  margin-bottom: 60px;
}