/* ============================================
   QR Code Generator - Modern CSS
   Orange/Amber accent theme
   ============================================ */

:root {
    --bg-primary: #0f0a08;
    --bg-secondary: #1a1210;
    --bg-card: #1f1814;
    --bg-card-hover: #2a211a;
    
    --text-primary: #ffffff;
    --text-secondary: #b0a090;
    --text-muted: #706050;
    
    --accent-primary: #f59e0b;
    --accent-secondary: #d97706;
    --accent-tertiary: #fbbf24;
    --accent-success: #10b981;
    --accent-error: #ef4444;
    
    --gradient-primary: linear-gradient(135deg, var(--accent-tertiary) 0%, var(--accent-primary) 50%, var(--accent-secondary) 100%);
    --gradient-subtle: linear-gradient(135deg, rgba(245, 158, 11, 0.1) 0%, rgba(217, 119, 6, 0.1) 100%);
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-color-hover: rgba(255, 255, 255, 0.15);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(245, 158, 11, 0.3);
    
    --font-primary: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Background Effects */
.bg-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    background: 
        radial-gradient(ellipse 80% 50% at 20% -20%, rgba(245, 158, 11, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 80% 0%, rgba(217, 119, 6, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse 50% 30% at 50% 100%, rgba(251, 191, 36, 0.08) 0%, transparent 50%);
}

.bg-noise {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1rem 1.5rem;
    background: rgba(15, 10, 8, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.25rem;
    transition: opacity var(--transition-fast);
}

.logo:hover { opacity: 0.8; }

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--accent-primary);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

.nav-links a:hover { color: var(--text-primary); }

/* Main Content */
.main {
    position: relative;
    z-index: 1;
    padding-top: 5rem;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 3rem 1.5rem 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--gradient-subtle);
    border: 1px solid var(--border-color);
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.6s ease;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.1); }
}

.hero-title {
    font-size: clamp(2.25rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1rem;
    letter-spacing: -0.03em;
    animation: fadeInUp 0.6s ease 0.1s both;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 550px;
    margin: 0 auto;
    line-height: 1.7;
    animation: fadeInUp 0.6s ease 0.2s both;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Generator Section */
.generator-section {
    padding: 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
    animation: fadeInUp 0.6s ease 0.3s both;
}

.generator-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
}

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

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

/* Options Column */
.options-column {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.option-label {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.input-textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 0.95rem;
    resize: vertical;
    min-height: 80px;
    transition: all var(--transition-fast);
}

.input-textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    background: rgba(255, 255, 255, 0.05);
}

.input-presets {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.preset-btn {
    padding: 0.35rem 0.75rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: var(--font-primary);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

/* Color Inputs */
.color-row {
    display: flex;
    gap: 1rem;
}

.color-input {
    flex: 1;
}

.color-input label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.35rem;
}

.color-picker-wrapper {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

input[type="color"] {
    width: 40px;
    height: 36px;
    padding: 0;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    background: none;
}

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

input[type="color"]::-webkit-color-swatch {
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
}

.color-text {
    flex: 1;
    padding: 0.5rem 0.75rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

.color-presets {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.color-preset {
    width: 32px;
    height: 32px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.03);
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.color-preset:hover {
    transform: scale(1.1);
    border-color: var(--accent-primary);
}

/* Style Buttons */
.style-buttons {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.style-btn {
    width: 48px;
    height: 48px;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.style-btn svg {
    width: 100%;
    height: 100%;
}

.style-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--border-color-hover);
}

.style-btn.active {
    background: rgba(245, 158, 11, 0.15);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* Logo Upload */
.logo-upload {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.logo-upload:hover {
    border-color: var(--accent-primary);
    background: rgba(245, 158, 11, 0.03);
}

.logo-upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
}

.logo-upload-content svg {
    width: 32px;
    height: 32px;
}

.logo-upload-content span {
    font-size: 0.85rem;
}

.logo-preview {
    position: relative;
    display: inline-block;
}

.logo-preview img {
    max-width: 100px;
    max-height: 100px;
    border-radius: var(--radius-sm);
}

.logo-remove {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 24px;
    height: 24px;
    background: var(--accent-error);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-size-control {
    margin-top: 0.75rem;
}

.logo-size-control label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.35rem;
}

/* Slider */
.slider {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--gradient-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.4);
}

.slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--gradient-primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

/* Generate Button */
.btn-generate {
    width: 100%;
    margin-top: 0.5rem;
    padding: 1rem 2rem;
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-md);
    color: #000;
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
}

.btn-generate:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn-generate.loading .btn-text { opacity: 0; }
.btn-generate.loading .btn-loader { opacity: 1; }

.btn-loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 24px;
    height: 24px;
    border: 3px solid rgba(0, 0, 0, 0.2);
    border-top-color: #000;
    border-radius: 50%;
    opacity: 0;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Preview Column */
.preview-column {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.preview-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 320px;
}

.preview-placeholder {
    text-align: center;
    color: var(--text-muted);
}

.preview-placeholder svg {
    width: 120px;
    height: 120px;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.preview-placeholder p {
    font-size: 0.9rem;
}

.preview-image img {
    max-width: 100%;
    max-height: 280px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
}

/* Download Buttons */
.download-buttons {
    display: flex;
    gap: 0.75rem;
}

.btn-download {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-download:hover {
    background: rgba(245, 158, 11, 0.15);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.btn-download svg {
    width: 18px;
    height: 18px;
}

/* Features Section */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
}

.feature {
    padding: 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-normal);
}

.feature:hover {
    transform: translateY(-4px);
    border-color: var(--border-color-hover);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-subtle);
    border-radius: var(--radius-md);
    color: var(--accent-primary);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
}

.feature h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.feature p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Use Cases Section */
.use-cases {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1.5rem 4rem;
    text-align: center;
}

.use-cases h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.use-cases-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
}

.use-case {
    padding: 0.75rem 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 100px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.use-case:hover {
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

/* Footer */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 3rem 1.5rem;
    margin-top: 2rem;
}

.footer-content {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    text-align: center;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.footer-brand .logo { font-size: 1.1rem; }
.footer-brand p { color: var(--text-muted); font-size: 0.9rem; }

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

.footer-links a:hover { color: var(--text-primary); }

.footer-copy {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: rgba(255, 255, 255, 0.02); border-radius: 4px; }
::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.1); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.15); }

/* Responsive */
@media (max-width: 768px) {
    .hero { padding: 2rem 1rem 1.5rem; }
    .hero-title { font-size: 1.75rem; }
    .generator-card { padding: 1.5rem; }
    .preview-card { min-height: 250px; padding: 1.5rem; }
    .color-row { flex-direction: column; gap: 0.75rem; }
    .style-buttons { justify-content: center; }
    .download-buttons { flex-direction: column; }
    .features { grid-template-columns: 1fr; padding: 2rem 1rem; }
}