/* Flow7 Landing Page CSS */

:root {
    --bg-primary: #050505;
    --bg-surface: rgba(255, 255, 255, 0.03);
    --bg-card: rgba(255, 255, 255, 0.05);

    --text-primary: #ffffff;
    --text-muted: #a1a1aa;
    --text-dark: #71717a;

    --accent: #10b981;
    --accent-hover: #ffffff;
    --btn-primary-bg: #ffffff;
    --btn-primary-text: #050505;
    --border: rgba(255, 255, 255, 0.1);

    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'Roboto Mono', ui-monospace, SFMono-Regular, monospace;

    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 32px;
    --space-xl: 64px;
    --space-2xl: 120px;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
}

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

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

body {
    background: linear-gradient(-45deg, #0f172a, #000000, #022c22, #000000);
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 999;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.05'/%3E%3C/svg%3E");
}

@keyframes gradientBG {
    0% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

/* Typography */
h1 {
    font-size: clamp(3rem, 6vw, 5rem);
    line-height: 1.1;
    letter-spacing: -0.04em;
    font-weight: 500;
    margin-bottom: var(--space-md);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    line-height: 1.2;
    letter-spacing: -0.03em;
    font-weight: 500;
    margin-bottom: var(--space-md);
}

h3 {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: var(--space-md);
}

p {
    color: var(--text-muted);
    margin-bottom: var(--space-md);
    font-size: 1.125rem;
}

.mono {
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.875rem;
}

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

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

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container.narrow {
    max-width: 800px;
}

.section {
    padding: var(--space-2xl) 0;
}

.bg-surface {
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.grid-2-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
}

.align-center {
    align-items: center;
}

.mb-xl {
    margin-bottom: var(--space-xl);
}

.mt-md {
    margin-top: var(--space-md);
}

.mt-xl {
    margin-top: var(--space-xl);
}

/* Buttons */
button {
    font-family: var(--font-sans);
    cursor: pointer;
    border: none;
    outline: none;
    transition: all 0.2s ease;
}

.btn-primary {
    background-color: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    padding: 12px 24px;
    border-radius: 9999px;
    /* Pill shape */
    font-weight: 600;
    font-size: 1rem;
    box-shadow: 0 4px 14px 0 rgba(255, 255, 255, 0.1);
}

.btn-primary:hover {
    background-color: #e4e4e7;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 255, 255, 0.15);
}

.btn-primary.lg {
    padding: 16px 32px;
    font-size: 1.125rem;
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 8px 16px;
    border-radius: 9999px;
    /* Pill shape */
    font-weight: 500;
    font-size: 0.875rem;
}

.btn-secondary:hover {
    border-color: var(--text-muted);
}

/* Nav */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    backdrop-filter: blur(12px);
    background-color: rgba(5, 5, 5, 0.4);
    border-bottom: 1px solid var(--border);
    z-index: 100;
    padding: var(--space-md) 0;
}

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

.logo img {
    height: 24px;
    display: block;
}

/* Hero Section */
.hero {
    padding-top: 180px;
    padding-bottom: var(--space-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.hero-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

.hero-content {
    max-width: 800px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-content h1 {
    font-size: clamp(3.5rem, 8vw, 6rem);
    letter-spacing: -0.05em;
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.badge {
    display: inline-block;
    padding: 6px 16px;
    border: 1px solid var(--border);
    border-radius: 20px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: var(--space-lg);
    background: var(--bg-surface);
}

.subtitle {
    font-size: 1.25rem;
    line-height: 1.6;
    margin-bottom: var(--space-xl);
    max-width: 600px;
    color: var(--text-dark);
}

.hero-visual {
    margin-top: var(--space-xl);
    width: 100%;
    max-width: 900px;
    display: flex;
    justify-content: center;
    padding: 0 var(--space-md);
}

.device-mockup {
    position: relative;
    border-radius: 32px;
    padding: 0;
    box-shadow: 0 35px 60px -15px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

/* Hide hero visual completely on mobile to clean up layout */
@media (max-width: 1024px) {
    .grid-2-col {
        grid-template-columns: 1fr;
    }
}

.app-screenshot {
    width: 100%;
    height: auto;
    object-fit: contain;
    display: block;
}

.app-screenshot.landscape {
    max-width: 800px;
    border-radius: 16px;
}

/* Placeholder */
.placeholder-img {
    width: 320px;
    height: 650px;
    background-color: var(--bg-card);
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--text-dark);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    border: 1px dashed var(--border);
}

.placeholder-img.landscape {
    width: 100%;
    max-width: 800px;
    height: 400px;
    border-radius: 16px;
    margin: 0 auto;
}

/* Shift Section */
.diagram {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    background: var(--bg-card);
    padding: var(--space-xl);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}

.diagram-node {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.diagram-node.muted {
    opacity: 0.5;
}

.diagram-node.active span {
    color: var(--accent);
}

.diagram-arrow {
    font-family: var(--font-mono);
    color: var(--text-dark);
}

/* Steps Grid */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.step-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
}

.step-number {
    font-family: var(--font-mono);
    font-size: 2rem;
    color: var(--text-dark);
    margin-bottom: var(--space-md);
}

.step-card h3 {
    color: var(--text-primary);
    font-size: 1.125rem;
}

.step-card p {
    font-size: 1rem;
    margin: 0;
}

/* Filtering Section */
.filtering-table {
    display: grid;
    grid-template-columns: 1fr 1fr;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.filter-col {
    padding: var(--space-lg);
}

.filter-col.is {
    background: var(--bg-surface);
    border-right: 1px solid var(--border);
}

.filter-header {
    margin-bottom: var(--space-md);
    color: var(--text-primary);
    border-bottom: 1px solid var(--border);
    padding-bottom: var(--space-md);
}

.filter-col ul {
    list-style: none;
}

.filter-col li {
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
    position: relative;
    padding-left: 24px;
}

.filter-col.is li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--text-dark);
}

.filter-col.is-not li {
    color: var(--text-muted);
    opacity: 0.7;
}

.filter-col.is-not li::before {
    content: '×';
    position: absolute;
    left: 0;
    color: var(--text-dark);
}

/* Comparison */
.comparison-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.comparison-item {
    border-top: 1px solid var(--border);
    padding-top: var(--space-lg);
}

.comparison-item h4 {
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

/* FAQ */
.faq-list {
    margin-top: var(--space-xl);
}

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

.faq-item:first-child {
    border-top: 1px solid var(--border);
}

.faq-question {
    padding: var(--space-lg) 0;
    cursor: pointer;
    font-weight: 500;
    font-size: 1.125rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question::after {
    content: '+';
    font-family: var(--font-mono);
    color: var(--text-dark);
    font-size: 1.5rem;
}

.faq-question.active::after {
    content: '−';
}

.faq-answer {
    display: none;
    padding-bottom: var(--space-lg);
    color: var(--text-muted);
}

/* Pre-footer */
.founder-quote {
    font-size: 1.5rem;
    color: var(--text-primary);
    line-height: 1.4;
    font-style: italic;
}

/* Footer */
.footer {
    padding: var(--space-2xl) 0 var(--space-lg);
    border-top: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0.5;
}

.footer-meta {
    margin-top: var(--space-2xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

.system-status {
    color: var(--accent);
    opacity: 0.8;
}

/* Responsive */
@media (max-width: 768px) {

    .steps-grid,
    .comparison-grid,
    .filtering-table,
    .grid-2-col {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .filter-col.is {
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    h1 {
        font-size: clamp(2.5rem, 10vw, 3.5rem) !important;
    }

    h2 {
        font-size: clamp(1.75rem, 8vw, 2.5rem) !important;
    }

    .section {
        padding: var(--space-xl) 0;
    }

    .hero {
        padding-top: 140px;
        padding-bottom: var(--space-xl);
    }

    .hero-visual {
        padding: 0;
        margin-top: var(--space-lg);
    }

    .subtitle {
        font-size: 1.125rem;
        padding: 0 var(--space-sm);
    }

    .visual-showcase {
        gap: 24px !important;
        margin-top: 32px !important;
        flex-direction: column;
        align-items: center;
        padding: 0 !important;
    }

    .visual-showcase>div {
        min-width: 100% !important;
    }

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

    .diagram {
        flex-direction: column;
        gap: var(--space-lg);
        text-align: center;
    }

    .diagram-arrow {
        transform: rotate(90deg);
    }
}

@media (max-width: 480px) {
    .btn-primary.lg {
        padding: 14px 24px;
        font-size: 1rem;
        width: 100%;
    }

    .hero-actions {
        width: 100%;
        display: flex;
        flex-direction: column;
        align-items: center;
    }
}