/* Modern QR Code Generator Stylesheet */

:root {
    --font-primary: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', Consolas, monospace;

    /* Color Palette */
    --bg-main: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --bg-input: #0f172a;
    --border-color: rgba(255, 255, 255, 0.1);
    --border-focus: #3b82f6;

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --accent-blue: #3b82f6;
    --accent-blue-hover: #2563eb;
    --accent-purple: #8b5cf6;
    --accent-green: #10b981;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;

    --shadow-card: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 25px rgba(59, 130, 246, 0.25);
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font-primary);
    background-color: var(--bg-main);
    background-image: 
        radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(139, 92, 246, 0.15) 0px, transparent 50%);
    background-attachment: fixed;
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Header Navbar */
.site-header {
    width: 100%;
    backdrop-filter: blur(16px);
    background: rgba(15, 23, 42, 0.8);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 800;
    font-size: 1.35rem;
    letter-spacing: -0.02em;
}

.logo-icon {
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    box-shadow: var(--shadow-glow);
}

.nav-tagline {
    font-size: 0.85rem;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.05);
    padding: 0.35rem 0.85rem;
    border-radius: 999px;
    border: 1px solid var(--border-color);
}

/* Main Layout */
.main-wrapper {
    max-width: 1200px;
    width: 100%;
    margin: 2rem auto;
    padding: 0 1.5rem;
    flex: 1;
}

.hero-section {
    text-align: center;
    margin-bottom: 2.5rem;
}

.hero-title {
    font-size: clamp(2rem, 4vw, 3.2rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, #ffffff 30%, #94a3b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: clamp(1rem, 1.8vw, 1.2rem);
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto;
}

/* Generator Container Grid */
.generator-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 2rem;
    align-items: start;
}

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

/* Glassmorphism Cards */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-card);
}

.card-header {
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.card-title svg {
    color: var(--accent-blue);
}

/* Input Form Controls */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.input-container {
    position: relative;
}

.form-input {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.9rem 1.2rem;
    font-size: 1rem;
    font-family: inherit;
    color: var(--text-primary);
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15);
}

.form-select {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.85rem 1rem;
    font-size: 0.95rem;
    font-family: inherit;
    color: var(--text-primary);
    cursor: pointer;
}

.form-select option {
    background: #0f172a;
    color: #ffffff;
}

/* Preset Buttons */
.presets-group {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.preset-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.4rem 0.85rem;
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.preset-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.2);
}

.preset-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
}

/* Accordion for Options */
.accordion-toggle {
    width: 100%;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.9rem 1.2rem;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    transition: var(--transition);
}

.accordion-toggle:hover {
    background: rgba(255, 255, 255, 0.07);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.accordion-content.open {
    max-height: 500px;
    margin-top: 1rem;
}

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

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

.color-input-wrapper {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.4rem 0.75rem;
}

.color-picker {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    width: 34px;
    height: 34px;
    background: transparent;
    border: none;
    cursor: pointer;
}

.color-picker::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-picker::-webkit-color-swatch {
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 6px;
}

.color-value-text {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-transform: uppercase;
}

/* Range Slider */
.range-slider {
    width: 100%;
    accent-color: var(--accent-blue);
    cursor: pointer;
}

.range-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
}

/* Preview Card */
.preview-card {
    text-align: center;
    position: sticky;
    top: 90px;
}

.qr-display-box {
    background: #ffffff;
    padding: 1.5rem;
    border-radius: var(--radius-md);
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    margin: 1rem 0 1.5rem 0;
    min-width: 240px;
    min-height: 240px;
    position: relative;
    transition: var(--transition);
}

.qr-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
    text-align: center;
}

.qr-display-img {
    max-width: 100%;
    height: auto;
    display: block;
}

.loading-spinner {
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.loading-spinner.active {
    opacity: 1;
    pointer-events: auto;
}

.spinner {
    width: 36px;
    height: 36px;
    border: 4px solid #e2e8f0;
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Download Action Buttons */
.download-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    width: 100%;
}

.btn-primary {
    width: 100%;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: #ffffff;
    border: none;
    border-radius: var(--radius-md);
    padding: 0.95rem 1.5rem;
    font-size: 1rem;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    box-shadow: var(--shadow-glow);
    min-height: 48px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
}

.btn-secondary-row {
    display: flex;
    gap: 0.5rem;
}

.btn-secondary {
    flex: 1;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    padding: 0.7rem 0.5rem;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    min-height: 44px;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.25);
}

/* SEO Content Section */
.seo-section {
    margin-top: 4rem;
    padding-top: 3rem;
    border-top: 1px solid var(--border-color);
}

.section-title {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    text-align: center;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3.5rem;
}

.feature-card {
    background: rgba(30, 41, 59, 0.4);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    transition: var(--transition);
}

.feature-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-4px);
}

.feature-icon {
    width: 44px;
    height: 44px;
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-blue);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.feature-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.feature-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* FAQ Accordion */
.faq-container {
    max-width: 800px;
    margin: 0 auto 3rem auto;
}

.faq-item {
    background: rgba(30, 41, 59, 0.5);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    overflow: hidden;
}

.faq-question {
    padding: 1.2rem 1.5rem;
    font-weight: 700;
    font-size: 1.05rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-primary);
}

.faq-answer {
    padding: 0 1.5rem 1.2rem 1.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    display: none;
}

.faq-item.open .faq-answer {
    display: block;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: #1e293b;
    border: 1px solid var(--accent-green);
    color: #ffffff;
    padding: 0.85rem 1.25rem;
    border-radius: var(--radius-md);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    font-size: 0.9rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 1000;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

/* Footer */
.site-footer {
    border-top: 1px solid var(--border-color);
    padding: 2rem 1.5rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    background: rgba(15, 23, 42, 0.9);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 0.75rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--accent-blue);
}