/* QRFlow.io - Main Stylesheet */

/* ===== CSS Variables ===== */
:root {
    --primary-blue: #3B82F6;
    --dark-blue: #1D4ED8;
    --light-blue: #60A5FA;
    --dark-text: #1E293B;
    --light-bg: #F8FAFC;
    --white: #FFFFFF;
    --gray-100: #F1F5F9;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-600: #475569;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

/* ===== Reset & Base ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--dark-text);
    background-color: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== Header & Navigation ===== */
.header {
    background: var(--white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo {
    height: 40px;
    width: 40px;
}

.brand-name {
    font-size: 24px;
    font-weight: 700;
    color: var(--dark-text);
}

.brand-highlight {
    color: var(--primary-blue);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--dark-text);
    font-weight: 500;
    transition: var(--transition);
    padding: 8px 16px;
    border-radius: 8px;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary-blue);
    background: var(--gray-100);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--dark-text);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--white);
    padding: 80px 0;
    text-align: center;
}

.hero-title {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 20px;
    animation: fadeInUp 0.8s ease;
}

.gradient-text {
    background: linear-gradient(90deg, #60A5FA, #A78BFA);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.95;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-cta {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-top: 60px;
    animation: fadeInUp 0.8s ease 0.6s both;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 8px;
}

.stat-label {
    display: block;
    font-size: 14px;
    opacity: 0.9;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Ad Placeholders ===== */
.ad-placeholder {
    padding: 30px 0;
    background: var(--gray-100);
}

.ad-banner {
    background: var(--white);
    border: 2px dashed var(--gray-300);
    border-radius: 8px;
    padding: 40px;
    text-align: center;
    color: var(--gray-600);
    font-size: 14px;
}

/* ===== Buttons ===== */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

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

.btn-primary:hover {
    background: var(--dark-blue);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--white);
    color: var(--primary-blue);
}

.btn-secondary:hover {
    background: var(--gray-100);
}

.btn-large {
    padding: 16px 32px;
    font-size: 18px;
}

.btn-premium {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: var(--white);
}

/* ===== Generator Section ===== */
.generator-section {
    padding: 60px 0;
    background: var(--light-bg);
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 40px;
}

.generator-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    background: var(--white);
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
}

.type-selector {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 30px;
}

.type-btn {
    padding: 12px;
    border: 2px solid var(--gray-200);
    background: var(--white);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.type-btn.active, .type-btn:hover {
    border-color: var(--primary-blue);
    background: var(--light-blue);
    color: var(--white);
}

.input-form {
    display: none;
}

.input-form.active {
    display: block;
}

.input-form input, .input-form textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--gray-200);
    border-radius: 8px;
    font-family: inherit;
    margin-bottom: 15px;
    transition: var(--transition);
}

.input-form input:focus, .input-form textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
}

.customization {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 20px;
}

.customization input[type="range"] {
    width: 100%;
}

.customization input[type="color"] {
    width: 60px;
    height: 40px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

.qr-preview {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--gray-100);
    border-radius: 12px;
    padding: 40px;
}

#qr-canvas {
    background: var(--white);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
}

.download-btns {
    display: flex;
    gap: 10px;
}

.download-btns button {
    padding: 10px 20px;
    background: var(--primary-blue);
    color: var(--white);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
}

.download-btns button:hover {
    background: var(--dark-blue);
}

/* ===== Footer ===== */
.footer {
    background: var(--dark-text);
    color: var(--white);
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3, .footer-section h4 {
    margin-bottom: 20px;
    color: var(--white);
}

.footer-section p {
    color: var(--gray-300);
    margin-bottom: 20px;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 12px;
}

.footer-section ul li a {
    color: var(--gray-300);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: var(--white);
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    font-size: 24px;
    transition: var(--transition);
}

.social-links a:hover {
    transform: scale(1.2);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--gray-600);
    color: var(--gray-300);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-top: 20px;
}

.footer-links a {
    color: var(--gray-300);
    text-decoration: none;
    transition: var(--transition);
}

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

/* ===== Guide Section ===== */
.guide-section {
    padding: 80px 0;
    background: var(--white);
}

.section-subtitle {
    text-align: center;
    color: var(--gray-600);
    font-size: 18px;
    margin-bottom: 50px;
}

.guide-steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 50px;
}

.step-card {
    text-align: center;
    padding: 40px 30px;
    background: var(--light-bg);
    border-radius: 16px;
    transition: var(--transition);
    position: relative;
}

.step-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.step-number {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    background: var(--primary-blue);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
}

.step-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.step-title {
    font-size: 22px;
    margin-bottom: 15px;
    color: var(--dark-text);
}

.step-description {
    color: var(--gray-600);
    line-height: 1.6;
}

/* ===== Features Section ===== */
.features-section {
    padding: 80px 0;
    background: var(--light-bg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 50px;
}

.feature-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.feature-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--dark-text);
}

.feature-card p {
    color: var(--gray-600);
    line-height: 1.6;
}

/* ===== FAQ Section ===== */
.faq-section {
    padding: 80px 0;
    background: var(--white);
}

.faq-accordion {
    max-width: 800px;
    margin: 0 auto;
    margin-top: 50px;
}

.faq-item {
    border-bottom: 1px solid var(--gray-200);
    margin-bottom: 10px;
}

.faq-question {
    width: 100%;
    padding: 20px;
    background: none;
    border: none;
    text-align: left;
    font-size: 18px;
    font-weight: 600;
    color: var(--dark-text);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--primary-blue);
}

.faq-icon {
    font-size: 24px;
    font-weight: 300;
    transition: var(--transition);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 20px 20px;
}

.faq-answer p {
    color: var(--gray-600);
    line-height: 1.8;
}

/* ===== Utility Classes ===== */
.text-center {
    text-align: center;
}

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}