/* ============================================
   PARETO LANDING PAGE
   Design System: Citrus + Mint + PostHog-inspired
   ============================================ */

/* ========== CSS Variables ========== */
:root {
    /* Colors - Pareto Brand */
    --color-citrus: #FF9A1F;
    --color-citrus-hover: #FFA833;
    --color-citrus-dark: #F28C0C;
    --color-citrus-light: #FFB54D;

    --color-mint: #3CD2A5;
    --color-mint-hover: #4ADDB3;
    --color-mint-dark: #2BB88F;
    --color-mint-light: #5EEBC4;

    --color-bleu: #12212C;
    --color-bleu-light: #1A2D3A;

    /* Gradients */
    --gradient-brand: linear-gradient(135deg, #FF9A1F 0%, #3CD2A5 100%);
    --gradient-citrus: linear-gradient(135deg, #FF9A1F 0%, #FFA833 100%);
    --gradient-hero: linear-gradient(135deg, rgba(255, 154, 31, 0.1) 0%, rgba(60, 210, 165, 0.1) 100%);

    /* Surfaces - Dark Mode */
    --surface-base: #0E1018;
    --surface-elevated: #161B24;
    --surface-card: #1A2029;
    --surface-hover: #1F2530;

    /* Text */
    --text-primary: #FFFFFF;
    --text-secondary: #A8AEBF;
    --text-tertiary: #6B7280;

    /* Typography */
    --font-display: 'Space Grotesk', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;

    /* Spacing */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 24px;
    --space-6: 32px;
    --space-7: 40px;
    --space-8: 56px;
    --space-9: 72px;
    --space-10: 96px;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 999px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(255, 154, 31, 0.3);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
    --transition-normal: 200ms cubic-bezier(0.16, 1, 0.3, 1);
    --transition-slow: 300ms cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--surface-base);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

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

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

/* ========== Container ========== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-4);
    }
}

/* ========== Navigation ========== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(14, 16, 24, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) 0;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
}

.nav-logo-icon {
    width: 32px;
    height: 32px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-5);
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }
}

/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.9375rem;
    cursor: pointer;
    border: none;
    transition: all var(--transition-normal);
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient-brand);
    color: white;
    box-shadow: 0 0 0 0 rgba(255, 154, 31, 0);
}

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

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

.btn-secondary {
    background: var(--surface-card);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background: var(--surface-hover);
    border-color: rgba(255, 154, 31, 0.3);
}

.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: 0.875rem;
}

.btn-lg {
    padding: var(--space-4) var(--space-6);
    font-size: 1.0625rem;
}

.btn-xl {
    padding: var(--space-5) var(--space-7);
    font-size: 1.125rem;
}

/* ========== Hero Section ========== */
.hero {
    position: relative;
    padding: calc(80px + var(--space-10)) 0 var(--space-10);
    overflow: hidden;
}

.hero-bg-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-hero);
    opacity: 1;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-9);
    align-items: center;
}

.hero-badge {
    margin-bottom: var(--space-5);
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
}

.badge-gradient {
    background: var(--gradient-brand);
    color: white;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: var(--space-5);
    line-height: 1.1;
}

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

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
    max-width: 600px;
}

.hero-cta {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-7);
}

.hero-stats {
    display: flex;
    gap: var(--space-7);
}

.stat {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.stat-value {
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--text-primary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

.hero-right {
    position: relative;
}

.hero-illustration {
    position: relative;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

/* Browser Mockup */
.browser-mockup {
    background: var(--surface-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.browser-header {
    background: var(--surface-elevated);
    padding: var(--space-3);
    display: flex;
    align-items: center;
    gap: var(--space-4);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.browser-dots {
    display: flex;
    gap: 6px;
}

.browser-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-tertiary);
}

.browser-url {
    flex: 1;
    background: var(--surface-base);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.browser-content {
    padding: var(--space-6);
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.extension-popup {
    background: var(--surface-elevated);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    border: 1px solid rgba(255, 154, 31, 0.3);
    box-shadow: 0 0 40px rgba(255, 154, 31, 0.2);
}

.popup-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.popup-header img {
    width: 32px;
    height: 32px;
}

.popup-header span {
    font-weight: 600;
}

.popup-btn {
    width: 100%;
    padding: var(--space-3) var(--space-5);
    background: var(--gradient-brand);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.popup-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(255, 154, 31, 0.4);
}

.hero-wave {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    color: var(--surface-base);
    line-height: 0;
}

.hero-wave svg {
    width: 100%;
    height: auto;
}

@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--space-7);
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}

/* ========== Problem/Solution Section ========== */
.problem-solution {
    padding: var(--space-10) 0;
}

.section-header {
    margin-bottom: var(--space-8);
}

.section-header.center {
    text-align: center;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--space-4);
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

.comparison {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--space-6);
    max-width: 1000px;
    margin: 0 auto;
}

.comparison-side {
    background: var(--surface-card);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.comparison-side h3 {
    font-size: 1.5rem;
    margin-bottom: var(--space-5);
}

.comparison-side.after {
    border: 1px solid rgba(255, 154, 31, 0.3);
    background: linear-gradient(135deg, rgba(255, 154, 31, 0.05), rgba(60, 210, 165, 0.05));
}

.comparison-list {
    list-style: none;
}

.comparison-list li {
    padding: var(--space-3) 0;
    color: var(--text-secondary);
    font-size: 1.0625rem;
}

.comparison-divider {
    display: flex;
    align-items: center;
    justify-content: center;
}

.divider-icon {
    width: 48px;
    height: 48px;
    background: var(--gradient-brand);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
}

@media (max-width: 968px) {
    .comparison {
        grid-template-columns: 1fr;
    }

    .comparison-divider {
        transform: rotate(90deg);
    }
}

/* ========== Features Section ========== */
.features {
    padding: var(--space-10) 0;
    background: var(--surface-elevated);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-6);
}

.feature-card {
    background: var(--surface-card);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 154, 31, 0.3);
    box-shadow: 0 0 40px rgba(255, 154, 31, 0.15);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-4);
}

.feature-title {
    font-size: 1.375rem;
    margin-bottom: var(--space-3);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========== How It Works Section ========== */
.how-it-works {
    padding: var(--space-10) 0;
}

.steps {
    max-width: 900px;
    margin: 0 auto;
}

.step {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: var(--space-6);
    align-items: center;
    padding: var(--space-6) 0;
}

.step:not(:last-child) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.step-number {
    width: 56px;
    height: 56px;
    background: var(--gradient-brand);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1.5rem;
    margin-bottom: var(--space-2);
}

.step-description {
    color: var(--text-secondary);
}

.step-visual {
    width: 80px;
    height: 80px;
    background: var(--surface-card);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
}

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

    .step-visual {
        display: none;
    }
}

/* ========== Social Proof Section ========== */
.social-proof {
    padding: var(--space-10) 0;
    background: var(--surface-elevated);
}

.testimonials {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-6);
}

.testimonial-card {
    background: var(--surface-card);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.testimonial-content {
    margin-bottom: var(--space-5);
}

.testimonial-text {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

.testimonial-author {
    display: flex;
    gap: var(--space-4);
    align-items: center;
}

.author-avatar {
    width: 48px;
    height: 48px;
    background: var(--surface-elevated);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.author-name {
    font-weight: 600;
}

.author-role {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

/* ========== CTA Section ========== */
.cta {
    position: relative;
    padding: var(--space-10) 0;
    overflow: hidden;
}

.cta-bg-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-hero);
    opacity: 1;
}

.cta-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.cta-title {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--space-4);
}

.cta-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-7);
}

.cta-buttons {
    margin-bottom: var(--space-5);
}

.cta-note {
    color: var(--text-tertiary);
    font-size: 0.9375rem;
}

/* ========== Footer ========== */
.footer {
    background: var(--surface-elevated);
    padding: var(--space-9) 0 var(--space-6);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-8);
    margin-bottom: var(--space-7);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
    margin-bottom: var(--space-3);
}

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

.footer-tagline {
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
}

.footer-title {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
    margin-bottom: var(--space-4);
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer-link {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-citrus);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-6);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

@media (max-width: 968px) {
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-6);
    }
}

@media (max-width: 568px) {
    .footer-content {
        grid-template-columns: 1fr;
    }
}