/* ========================================
   PuffGuard - Main Stylesheet
   ======================================== */

/* ========================================
   1. CSS Variables / Design Tokens
   ======================================== */
:root {
    /* Colors */
    --color-primary-50: #E5E3FD;
    --color-primary-100: #B8B3F9;
    --color-primary-200: #8A83F6;
    --color-primary-300: #5D54F4;
    --color-primary-400: #4339F2;
    --color-primary-500: #2E25D9;
    --color-primary-600: #1F19B3;

    --color-success: #00C853;
    --color-warning: #FFD60A;
    --color-error: #FF3B30;
    --color-info: #00D9E1;

    --color-gray-50: #FAFAFA;
    --color-gray-100: #F5F5F7;
    --color-gray-200: #E5E5EA;
    --color-gray-300: #D1D1D6;
    --color-gray-400: #C7C7CC;
    --color-gray-500: #8E8E93;
    --color-gray-600: #636366;
    --color-gray-700: #48484A;
    --color-gray-800: #3A3A3C;
    --color-gray-900: #1C1C1E;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', sans-serif;

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;

    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;

    --leading-tight: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.75;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    --space-5xl: 8rem;

    /* Effects */
    --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);

    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;

    /* Breakpoints */
    --screen-sm: 640px;
    --screen-md: 768px;
    --screen-lg: 1024px;
    --screen-xl: 1280px;
    --screen-2xl: 1536px;
}

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

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

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--color-gray-900);
    background-color: #fff;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-bold);
    line-height: var(--leading-tight);
    color: var(--color-gray-900);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }

p {
    margin-bottom: var(--space-md);
}

a {
    text-decoration: none;
    color: inherit;
}

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

button {
    cursor: pointer;
    font-family: inherit;
    font-size: inherit;
    border: none;
    background: none;
}

ul, ol {
    list-style: none;
}

/* ========================================
   3. Layout Components
   ======================================== */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

@media (max-width: 640px) {
    .container {
        padding: 0 var(--space-md);
    }
}

/* ========================================
   4. Navigation
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--color-gray-200);
    transition: all var(--transition-base);
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--color-primary-400);
}

.logo-img {
    height: 32px;
    width: auto;
}

.logo-text {
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--color-primary-400);
}

.nav-menu {
    display: none;
    gap: var(--space-2xl);
}

@media (min-width: 768px) {
    .nav-menu {
        display: flex;
    }
}

.nav-link {
    font-size: var(--text-base);
    font-weight: var(--font-medium);
    color: var(--color-gray-700);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--color-primary-400);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary-400);
    transition: width var(--transition-base);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    width: 24px;
    height: 24px;
    justify-content: center;
    gap: 4px;
}

@media (min-width: 768px) {
    .mobile-menu-toggle {
        display: none;
    }
}

.mobile-menu-toggle span {
    width: 100%;
    height: 2px;
    background: var(--color-gray-900);
    transition: all var(--transition-base);
}

/* ========================================
   5. Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
    cursor: pointer;
    text-align: center;
}

.btn-primary {
    background: var(--color-primary-400);
    color: white;
}

.btn-primary:hover {
    background: var(--color-primary-500);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(67, 57, 242, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: transparent;
    color: var(--color-primary-400);
    border: 2px solid var(--color-primary-400);
}

.btn-secondary:hover {
    background: var(--color-primary-400);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(67, 57, 242, 0.2);
}

.btn-large {
    padding: var(--space-md) var(--space-xl);
    font-size: var(--text-lg);
}

.btn-block {
    width: 100%;
}

/* ========================================
   6. Hero Section
   ======================================== */
.hero {
    padding-top: calc(72px + var(--space-4xl));
    padding-bottom: var(--space-4xl);
    position: relative;
    overflow: hidden;
}

.hero-bg-gradient {
    position: absolute;
    top: 0;
    right: -20%;
    width: 60%;
    height: 120%;
    background: radial-gradient(circle, var(--color-primary-100) 0%, transparent 70%);
    opacity: 0.3;
    pointer-events: none;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-3xl);
    align-items: center;
}

@media (min-width: 1024px) {
    .hero-content {
        grid-template-columns: 1.2fr 1fr;
    }
}

.hero-headline {
    font-size: var(--text-4xl);
    margin-bottom: var(--space-lg);
    background: linear-gradient(135deg, var(--color-gray-900) 0%, var(--color-primary-600) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

@media (min-width: 768px) {
    .hero-headline {
        font-size: var(--text-5xl);
    }
}

@media (min-width: 1024px) {
    .hero-headline {
        font-size: var(--text-6xl);
    }
}

.hero-subheadline {
    font-size: var(--text-lg);
    color: var(--color-gray-600);
    margin-bottom: var(--space-2xl);
    line-height: var(--leading-relaxed);
}

@media (min-width: 768px) {
    .hero-subheadline {
        font-size: var(--text-xl);
    }
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
}

@media (max-width: 640px) {
    .hero-cta {
        flex-direction: column;
    }

    .hero-cta .btn {
        width: 100%;
    }
}

.trust-badges {
    display: flex;
    gap: var(--space-2xl);
    flex-wrap: wrap;
}

.trust-badge {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.badge-number {
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--color-primary-400);
}

.badge-text {
    font-size: var(--text-sm);
    color: var(--color-gray-600);
}

.hero-visual {
    position: relative;
}

.phone-mockup {
    max-width: 400px;
    margin: 0 auto;
}

/* ========================================
   7. Stats Banner
   ======================================== */
.stats-banner {
    background: var(--color-gray-50);
    padding: var(--space-3xl) 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-2xl);
    text-align: center;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
}

.stat-number {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    color: var(--color-primary-400);
}

.stat-label {
    font-size: var(--text-base);
    color: var(--color-gray-600);
}

/* ========================================
   8. Features Section
   ======================================== */
.features {
    padding: var(--space-4xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-title {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-md);
}

@media (min-width: 768px) {
    .section-title {
        font-size: var(--text-4xl);
    }
}

.section-subtitle {
    font-size: var(--text-lg);
    color: var(--color-gray-600);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-2xl);
}

.feature-card {
    background: white;
    padding: var(--space-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    cursor: pointer;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    margin-bottom: var(--space-lg);
}

.feature-title {
    font-size: var(--text-xl);
    margin-bottom: var(--space-sm);
}

.feature-description {
    color: var(--color-gray-600);
    line-height: var(--leading-relaxed);
}

/* ========================================
   9. How It Works
   ======================================== */
.how-it-works {
    padding: var(--space-4xl) 0;
    background: var(--color-gray-50);
}

.steps-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
    max-width: 800px;
    margin: 0 auto;
}

.step-item {
    display: flex;
    gap: var(--space-lg);
    position: relative;
}

.step-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: var(--color-primary-400);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
}

.step-content {
    flex: 1;
}

.step-title {
    font-size: var(--text-xl);
    margin-bottom: var(--space-sm);
}

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

.step-line {
    position: absolute;
    left: 24px;
    top: 60px;
    width: 2px;
    height: calc(100% + var(--space-lg));
    background: var(--color-gray-300);
}

.step-item:last-child .step-line {
    display: none;
}

/* ========================================
   10. Testimonials
   ======================================== */
.testimonials {
    padding: var(--space-4xl) 0;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-2xl);
}

.testimonial-card {
    background: white;
    padding: var(--space-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.testimonial-stars {
    color: var(--color-warning);
    font-size: var(--text-lg);
}

.testimonial-text {
    flex: 1;
    font-size: var(--text-base);
    line-height: var(--leading-relaxed);
    color: var(--color-gray-700);
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.author-avatar {
    width: 48px;
    height: 48px;
    background: var(--color-primary-100);
    color: var(--color-primary-600);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-bold);
}

.author-name {
    font-weight: var(--font-semibold);
}

.author-meta {
    font-size: var(--text-sm);
    color: var(--color-gray-600);
}

/* ========================================
   11. Pricing
   ======================================== */
.pricing {
    padding: var(--space-4xl) 0;
    background: var(--color-gray-50);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-2xl);
    max-width: 1024px;
    margin: 0 auto;
}

.pricing-card {
    background: white;
    padding: var(--space-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    position: relative;
    display: flex;
    flex-direction: column;
}

.pricing-featured {
    border: 2px solid var(--color-primary-400);
    transform: scale(1.05);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary-400);
    color: white;
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: var(--font-bold);
}

.pricing-title {
    font-size: var(--text-xl);
    margin-bottom: var(--space-md);
}

.pricing-price {
    display: flex;
    align-items: baseline;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.price-amount {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    color: var(--color-primary-400);
}

.price-period {
    color: var(--color-gray-600);
}

.pricing-description {
    color: var(--color-gray-600);
    margin-bottom: var(--space-lg);
}

.pricing-features {
    flex: 1;
    margin-bottom: var(--space-xl);
}

.pricing-features li {
    padding: var(--space-sm) 0;
    padding-left: var(--space-lg);
    position: relative;
    color: var(--color-gray-700);
}

.pricing-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-success);
    font-weight: var(--font-bold);
}

.pricing-note {
    text-align: center;
    font-size: var(--text-sm);
    color: var(--color-gray-600);
    margin-top: var(--space-md);
}

/* ========================================
   12. FAQ Section
   ======================================== */
.faq {
    padding: var(--space-4xl) 0;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--color-gray-200);
    padding: var(--space-lg) 0;
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--color-gray-900);
    cursor: pointer;
    transition: color var(--transition-fast);
}

.faq-question:hover {
    color: var(--color-primary-400);
}

.faq-icon {
    font-size: var(--text-2xl);
    transition: transform var(--transition-base);
}

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

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
}

.faq-answer p {
    padding-top: var(--space-md);
    color: var(--color-gray-700);
    line-height: var(--leading-relaxed);
}

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

/* ========================================
   13. Download CTA
   ======================================== */
.download-cta {
    padding: var(--space-4xl) 0;
    background: var(--color-gray-50);
    position: relative;
    overflow: hidden;
}

.cta-bg-gradient {
    position: absolute;
    bottom: -50%;
    left: -20%;
    width: 60%;
    height: 120%;
    background: radial-gradient(circle, var(--color-primary-100) 0%, transparent 70%);
    opacity: 0.3;
    pointer-events: none;
}

.cta-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.cta-title {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-md);
}

@media (min-width: 768px) {
    .cta-title {
        font-size: var(--text-4xl);
    }
}

.cta-subtitle {
    font-size: var(--text-lg);
    color: var(--color-gray-600);
    margin-bottom: var(--space-2xl);
}

.app-badges {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    margin-bottom: var(--space-2xl);
}

.app-badge img {
    height: 48px;
}

.qr-code {
    margin-top: var(--space-2xl);
}

.qr-text {
    font-size: var(--text-sm);
    color: var(--color-gray-600);
    margin-bottom: var(--space-md);
}

.qr-code img {
    width: 150px;
    height: 150px;
    margin: 0 auto;
}

/* ========================================
   14. Footer
   ======================================== */
.footer {
    background: var(--color-gray-900);
    color: white;
    padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-3xl);
    margin-bottom: var(--space-3xl);
}

.footer-title {
    font-size: var(--text-xl);
    margin-bottom: var(--space-md);
}

.footer-heading {
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    margin-bottom: var(--space-md);
    color: white;
}

.footer-description,
.footer-text {
    color: var(--color-gray-400);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--space-lg);
}

.footer-links li {
    padding: var(--space-xs) 0;
}

.footer-links a {
    color: var(--color-gray-400);
    transition: color var(--transition-fast);
}

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

.social-links {
    display: flex;
    gap: var(--space-md);
}

.social-link {
    width: 40px;
    height: 40px;
    background: var(--color-gray-800);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-gray-400);
    transition: all var(--transition-base);
}

.social-link:hover {
    background: var(--color-primary-400);
    color: white;
    transform: translateY(-2px);
}

.newsletter-form {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.newsletter-input {
    flex: 1;
    min-width: 200px;
    padding: var(--space-sm) var(--space-md);
    background: var(--color-gray-800);
    border: 1px solid var(--color-gray-700);
    border-radius: var(--radius-md);
    color: white;
}

.newsletter-input::placeholder {
    color: var(--color-gray-500);
}

.footer-bottom {
    padding-top: var(--space-2xl);
    border-top: 1px solid var(--color-gray-800);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.copyright {
    color: var(--color-gray-400);
}

.footer-bottom-links {
    display: flex;
    gap: var(--space-md);
    align-items: center;
}

.footer-bottom-links a {
    color: var(--color-gray-400);
    transition: color var(--transition-fast);
}

.footer-bottom-links a:hover {
    color: white;
}

.separator {
    color: var(--color-gray-600);
}

/* ========================================
   15. Animations
   ======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.animate-fade-up {
    opacity: 0;
    animation: fadeInUp 0.6s ease-out forwards;
}

.animate-fade-in {
    opacity: 0;
    animation: fadeIn 0.6s ease-out forwards;
}

.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }
.animate-delay-4 { animation-delay: 0.4s; }

/* Scroll animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.6s ease-out;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   16. Responsive Utilities
   ======================================== */
@media (max-width: 768px) {
    .hide-mobile {
        display: none;
    }
}

@media (min-width: 769px) {
    .hide-desktop {
        display: none;
    }
}

/* ========================================
   17. Reduced Motion
   ======================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}