/* ============================================
   SPLITO.AI - Early Access Landing Page
   Design System & Styles
   ============================================ */

/* CSS Custom Properties (Design Tokens) */
:root {
    /* Colors - Based on Flowjin */
    --color-bg-primary: #141a21;
    --color-bg-secondary: #1a222b;
    --color-bg-tertiary: #232d3a;
    --color-bg-card: rgba(35, 45, 58, 0.6);

    --color-text-primary: #ffffff;
    --color-text-secondary: #a0aec0;
    --color-text-muted: #6b7a90;

    --color-accent-start: #F472B6;
    --color-accent-end: #FBBF24;
    --color-accent-glow: rgba(244, 114, 182, 0.3);

    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-hover: rgba(255, 255, 255, 0.15);

    /* Gradients */
    --gradient-accent: linear-gradient(135deg, var(--color-accent-start) 0%, var(--color-accent-end) 100%);
    --gradient-bg: radial-gradient(ellipse at top, var(--color-bg-secondary) 0%, var(--color-bg-primary) 50%);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;
    --font-size-6xl: 4.5rem;

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

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 60px var(--color-accent-glow);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;

    /* Layout */
    --container-max: 1200px;
    --header-height: 72px;
}

/* ============================================
   Base Styles
   ============================================ */

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
    min-height: 100vh;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ============================================
   Typography
   ============================================ */

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

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

.section-label {
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent-start);
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-lg);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-3xl);
}

/* ============================================
   Header / Navigation
   ============================================ */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(20, 26, 33, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--color-text-primary);
}

.logo-icon {
    font-size: var(--font-size-2xl);
    color: var(--color-accent-start);
}

.logo-text {
    font-family: 'Space Grotesk', sans-serif;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.logo-accent {
    color: var(--color-accent-start);
}

.nav-badge {
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(244, 114, 182, 0.1);
    color: var(--color-accent-start);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    border-radius: var(--radius-full);
    border: 1px solid rgba(244, 114, 182, 0.3);
    transition: all var(--transition-fast);
}

.nav-badge:hover {
    background: rgba(244, 114, 182, 0.2);
    border-color: rgba(244, 114, 182, 0.5);
}

/* ============================================
   Buttons & Forms
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-accent);
    color: var(--color-text-primary);
}

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

.btn-arrow {
    transition: transform var(--transition-fast);
}

.btn:hover .btn-arrow {
    transform: translateX(4px);
}

.form-group {
    display: flex;
    gap: var(--spacing-sm);
    width: 100%;
    max-width: 480px;
}

.form-input {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input::placeholder {
    color: var(--color-text-muted);
}

.form-input:focus {
    border-color: var(--color-accent-start);
    box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.form-note {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: var(--spacing-md);
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: calc(var(--header-height) + var(--spacing-4xl)) var(--spacing-lg) var(--spacing-4xl);
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: var(--font-size-5xl);
    margin-bottom: var(--spacing-xl);
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-2xl);
}

.hero-form {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-glow {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 600px;
    background: radial-gradient(ellipse, var(--color-accent-glow) 0%, transparent 60%);
    opacity: 0.4;
    pointer-events: none;
}

/* Social Proof */
.social-proof {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-2xl);
    animation: fadeInUp 0.6s ease-out both;
    animation-delay: 0.3s;
}

.social-proof-icons {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.platform-icon {
    width: 24px;
    height: 24px;
    color: var(--color-text-muted);
    opacity: 0.6;
    transition: opacity var(--transition-fast), color var(--transition-fast);
}

.platform-icon:hover {
    opacity: 1;
    color: var(--color-text-secondary);
}

.social-proof-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* ============================================
   Visual Proof / Comparison Section
   ============================================ */

.visual-proof {
    padding: var(--spacing-2xl) var(--spacing-lg) var(--spacing-4xl);
    text-align: center;
}

.comparison-grid {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

.comparison-card {
    flex: 1;
    max-width: 380px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.comparison-card:hover {
    transform: translateY(-4px);
}

.comparison-card--before:hover {
    box-shadow: 0 8px 32px rgba(239, 68, 68, 0.2);
}

.comparison-card--winner:hover {
    box-shadow: 0 8px 32px var(--color-accent-glow);
}

.comparison-label {
    padding: var(--spacing-md);
    text-align: center;
}

.comparison-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-full);
}

.comparison-badge--before {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
}

.comparison-badge--winner {
    background: rgba(251, 191, 36, 0.15);
    color: var(--color-accent-start);
}

.comparison-thumbnail {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
}

.comparison-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.comparison-stats {
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--color-bg-secondary);
}

.comparison-ctr {
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.comparison-ctr--low {
    color: #ef4444;
}

.comparison-ctr--high {
    color: var(--color-accent-start);
}

.comparison-trend {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.comparison-trend--down {
    color: #ef4444;
}

.comparison-trend--up {
    color: #22c55e;
}

.comparison-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    flex-shrink: 0;
}

.comparison-vs {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text-muted);
}

.comparison-caption {
    margin-top: var(--spacing-xl);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

@media (max-width: 768px) {
    .comparison-grid {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .comparison-card {
        max-width: 100%;
        width: 100%;
    }

    .comparison-divider {
        width: 100%;
        padding: var(--spacing-sm) 0;
    }
}

/* ============================================
   Problem Section
   ============================================ */

.problem {
    padding: var(--spacing-4xl) var(--spacing-lg);
    text-align: center;
    background: var(--gradient-bg);
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.problem-card,
.feature-card {
    padding: var(--spacing-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    text-align: left;
    backdrop-filter: blur(10px);
    transition: border-color var(--transition-base), transform var(--transition-base);
}

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

/* Shared Card Styles - Inline Icon + Heading */
.card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.card-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.card-icon svg {
    color: var(--color-text-muted);
}

.card-heading {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin: 0;
}

.card-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin: 0;
}

/* ============================================
   Features Section
   ============================================ */

.features {
    padding: var(--spacing-4xl) var(--spacing-lg);
    text-align: center;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

/* ============================================
   How It Works Section
   ============================================ */

.how-it-works {
    padding: var(--spacing-4xl) var(--spacing-lg);
    text-align: center;
    background: var(--gradient-bg);
}

.steps-grid {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-3xl);
}

.step {
    flex: 1;
    max-width: 280px;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--gradient-accent);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.step-heading {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
}

.step-text {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
}

.step-arrow {
    font-size: var(--font-size-3xl);
    color: var(--color-text-muted);
    margin-top: var(--spacing-xl);
}

/* ============================================
   CTA Footer Section
   ============================================ */

.cta-footer {
    position: relative;
    padding: var(--spacing-4xl) var(--spacing-lg);
    text-align: center;
    overflow: hidden;
}

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

.cta-title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-lg);
}

.cta-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 540px;
    margin: 0 auto var(--spacing-2xl);
}

.cta-form {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.cta-glow {
    position: absolute;
    bottom: -200px;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 600px;
    background: radial-gradient(ellipse, var(--color-accent-glow) 0%, transparent 60%);
    opacity: 0.3;
    pointer-events: none;
}

/* ============================================
   Footer
   ============================================ */

.footer {
    padding: var(--spacing-xl) var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

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

/* ============================================
   Animations
   ============================================ */

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title,
.hero-subtitle,
.hero-form {
    animation: fadeInUp 0.6s ease-out both;
}

.hero-subtitle {
    animation-delay: 0.1s;
}

.hero-form {
    animation-delay: 0.2s;
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 1024px) {
    .hero-title {
        font-size: var(--font-size-4xl);
    }

    .problem-grid,
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .steps-grid {
        flex-wrap: wrap;
    }

    .step-arrow {
        display: none;
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.5rem;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    .hero {
        min-height: auto;
        padding-top: calc(var(--header-height) + var(--spacing-3xl));
        padding-bottom: var(--spacing-3xl);
    }

    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .problem-grid,
    .features-grid {
        grid-template-columns: 1fr;
    }

    .steps-grid {
        flex-direction: column;
        align-items: center;
    }

    .step {
        max-width: 100%;
    }

    .form-group {
        flex-direction: column;
    }

    .form-input,
    .btn {
        width: 100%;
    }

    .section-title {
        font-size: var(--font-size-3xl);
    }

    .cta-title {
        font-size: var(--font-size-3xl);
    }

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .nav-cta {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-xs);
    }

    .hero-title {
        font-size: var(--font-size-2xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-base);
    }
}