/* ============================================================
   Prick Landing Page — style.css
   Light theme. Brand: Rose #C94058, soft grays, clean whites.
   ============================================================ */

:root {
    --rose: #C94058;
    --rose-light: #E8899A;
    --rose-dark: #881337;
    --green: #22C55E;
    --green-muted: #BBF7D0;
    --amber: #F59E0B;
    --sky: #0EA5E9;
    --sky-muted: #BAE6FD;
    --red: #EF4444;

    --bg: #FAFAFA;
    --bg-warm: #F5F3F0;
    --surface: #FFFFFF;
    --surface-raised: #F1F5F9;
    --surface-border: #E2E8F0;

    --text-primary: #1E293B;
    --text-secondary: #475569;
    --text-muted: #94A3B8;

    --font-stack: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-stack);
    background-color: var(--bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    color: var(--rose);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--rose-dark);
}

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

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

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1rem 1.5rem;
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.25rem;
}

.nav-brand img {
    width: 36px;
    height: 36px;
    border-radius: 8px;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: color 0.2s;
}

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

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.25rem;
}

/* ============================================================
   Container
   ============================================================ */

.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

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

.hero {
    padding: 8rem 0 4rem;
    text-align: center;
    background: linear-gradient(180deg, #FFF 0%, var(--bg) 100%);
}

.hero-icon {
    width: 120px;
    height: 120px;
    border-radius: 28px;
    margin: 0 auto 2rem;
    box-shadow:
        0 8px 30px rgba(201, 64, 88, 0.12),
        0 2px 8px rgba(0, 0, 0, 0.06);
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.hero h1 span {
    background: linear-gradient(135deg, var(--rose), #E8899A);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-tagline {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto 2rem;
}

.hero-badges {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 3rem;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    background: var(--surface);
    color: var(--text-secondary);
    border: 1px solid var(--surface-border);
}

.badge-green { color: #16A34A; border-color: #BBF7D0; background: #F0FDF4; }
.badge-sky   { color: #0284C7; border-color: #BAE6FD; background: #F0F9FF; }
.badge-rose  { color: var(--rose); border-color: #FECDD3; background: #FFF1F2; }

.app-store-badge {
    display: inline-block;
    transition: opacity 0.2s;
}

.app-store-badge:hover {
    opacity: 0.85;
}

.app-store-badge img {
    height: 54px;
}

/* ============================================================
   Screenshot Fan-out (hero)
   ============================================================ */

.screenshot-fan {
    position: relative;
    width: 100%;
    max-width: 700px;
    height: 520px;
    margin: 0 auto;
    perspective: 1200px;
}

.fan-card {
    position: absolute;
    width: 220px;
    left: 50%;
    top: 50%;
    transform-origin: bottom center;
    transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.fan-card img {
    pointer-events: none;
}

/* 5-card fan positions */
.fan-card:nth-child(1) { transform: translate(-50%, -50%) translateX(-180px) rotate(-12deg); z-index: 1; }
.fan-card:nth-child(2) { transform: translate(-50%, -50%) translateX(-90px)  rotate(-6deg);  z-index: 2; }
.fan-card:nth-child(3) { transform: translate(-50%, -50%) translateX(0px)    rotate(0deg);   z-index: 5; }
.fan-card:nth-child(4) { transform: translate(-50%, -50%) translateX(90px)   rotate(6deg);   z-index: 2; }
.fan-card:nth-child(5) { transform: translate(-50%, -50%) translateX(180px)  rotate(12deg);  z-index: 1; }

.fan-card:nth-child(3):hover {
    transform: translate(-50%, -50%) translateX(0px) rotate(0deg) scale(1.03);
}

/* ============================================================
   App Screenshot (rounded corners + shadow, no device frame)
   ============================================================ */

.mockup-img {
    display: block;
    width: 100%;
    border-radius: 36px;
    box-shadow:
        0 20px 60px rgba(0, 0, 0, 0.10),
        0 6px 20px rgba(0, 0, 0, 0.06);
}

.mockup-small {
    max-width: 280px;
}

/* ============================================================
   Card Stack — V-formation shuffle
   ============================================================ */

.card-stack {
    position: relative;
    width: 280px;
    flex: 0 0 280px;
    /* Height set by the front card; back card is absolute */
}

.card-stack .stack-card {
    transition: transform 0.7s cubic-bezier(0.4, 0, 0.2, 1),
                z-index 0s 0.35s,
                opacity 0.7s ease;
    transform-origin: bottom center;
}

/* Card A (first): front-left of the V */
.card-stack .stack-card:first-child {
    position: relative;
    z-index: 2;
    transform: rotate(-3deg) translateX(-8px);
}

/* Card B (second): back-right of the V, peeking out */
.card-stack .stack-card:last-child {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1;
    transform: rotate(3deg) translateX(8px) scale(0.97);
    opacity: 0.75;
}

/* Swapped: B comes front-left, A goes back-right */
.card-stack.swapped .stack-card:first-child {
    z-index: 1;
    transform: rotate(3deg) translateX(8px) scale(0.97);
    opacity: 0.75;
}

.card-stack.swapped .stack-card:last-child {
    z-index: 2;
    transform: rotate(-3deg) translateX(-8px) scale(1);
    opacity: 1;
}

/* ============================================================
   Mode Toggle (light/dark screenshots)
   ============================================================ */

.mode-toggle {
    display: inline-flex;
    background: var(--surface);
    border-radius: 100px;
    padding: 4px;
    margin: 2rem auto;
    border: 1px solid var(--surface-border);
}

.mode-toggle button {
    padding: 0.4rem 1rem;
    border-radius: 100px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--font-stack);
}

.mode-toggle button.active {
    background: var(--rose);
    color: white;
}

/* ============================================================
   Feature Sections
   ============================================================ */

.features {
    padding: 2rem 0;
}

.feature {
    display: flex;
    align-items: center;
    gap: 4rem;
    padding: 4rem 0;
}

.feature:nth-child(even) {
    flex-direction: row-reverse;
}

.feature-text {
    flex: 1;
    min-width: 0;
}

.feature-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--rose);
    margin-bottom: 0.75rem;
}

.feature-text h2 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    line-height: 1.2;
    color: var(--text-primary);
}

.feature-text p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
}

.feature-visual {
    flex: 0 0 280px;
}

/* ============================================================
   Experiment Types Grid
   ============================================================ */

.experiment-types {
    padding: 1rem 0 4rem;
    text-align: center;
}

.experiment-types h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2rem;
}

.experiment-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
    text-align: left;
}

.experiment-card {
    background: var(--surface);
    border: 1px solid var(--surface-border);
    border-radius: 14px;
    padding: 1.25rem 1.5rem;
    transition: box-shadow 0.2s, border-color 0.2s;
}

.experiment-card:hover {
    border-color: #FECDD3;
    box-shadow: 0 4px 16px rgba(201, 64, 88, 0.06);
}

.experiment-icon {
    font-size: 1.5rem;
    display: block;
    margin-bottom: 0.5rem;
}

.experiment-card h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.35rem;
}

.experiment-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.55;
    margin: 0;
}

/* ============================================================
   Privacy Banner
   ============================================================ */

.privacy-banner {
    padding: 4rem 0;
    text-align: center;
}

.privacy-banner-inner {
    background: linear-gradient(135deg, #F0FDF4, #F0F9FF);
    border: 1px solid #D1FAE5;
    border-radius: 20px;
    padding: 3rem 2rem;
    max-width: 720px;
    margin: 0 auto;
}

.privacy-banner-inner h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #16A34A;
}

.privacy-banner-inner p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.7;
}

/* ============================================================
   Story Section
   ============================================================ */

.story {
    padding: 5rem 0;
}

.story-inner {
    max-width: 680px;
    margin: 0 auto;
}

.story-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--rose);
    margin-bottom: 1rem;
}

.story h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    color: var(--text-primary);
}

.story p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 1.25rem;
}

.story p:last-child {
    margin-bottom: 0;
}

/* ============================================================
   Developer Section
   ============================================================ */

.developer {
    padding: 3rem 0;
    text-align: center;
}

.developer p {
    color: var(--text-secondary);
    font-size: 1rem;
}

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

.footer {
    padding: 3rem 0;
    border-top: 1px solid var(--surface-border);
}

.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    text-align: center;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    list-style: none;
}

.footer-links a {
    color: var(--text-muted);
    font-size: 0.85rem;
}

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

.footer-copy {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-app-store {
    display: inline-block;
    transition: opacity 0.2s;
    margin-bottom: 0.5rem;
}

.footer-app-store:hover {
    opacity: 0.85;
}

.footer-app-store img {
    height: 44px;
}

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

.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.96);
        padding: 1rem 1.5rem;
        gap: 0.75rem;
        border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    }

    .nav-links.open {
        display: flex;
    }

    .nav-toggle {
        display: block;
    }

    .hero {
        padding: 6rem 0 3rem;
    }

    .hero h1 {
        font-size: 2.25rem;
    }

    .hero-tagline {
        font-size: 1.05rem;
    }

    .screenshot-fan {
        max-width: 500px;
        height: 420px;
    }

    .fan-card {
        width: 170px;
    }

    .fan-card:nth-child(1) { transform: translate(-50%, -50%) translateX(-130px) rotate(-10deg); }
    .fan-card:nth-child(2) { transform: translate(-50%, -50%) translateX(-65px)  rotate(-5deg);  }
    .fan-card:nth-child(3) { transform: translate(-50%, -50%) translateX(0px)    rotate(0deg);   }
    .fan-card:nth-child(4) { transform: translate(-50%, -50%) translateX(65px)   rotate(5deg);   }
    .fan-card:nth-child(5) { transform: translate(-50%, -50%) translateX(130px)  rotate(10deg);  }

    .feature {
        flex-direction: column !important;
        gap: 2rem;
        padding: 2.5rem 0;
        text-align: center;
    }

    .feature-visual {
        flex: none;
        max-width: 240px;
        margin: 0 auto;
    }

    .card-stack {
        width: 240px;
        flex: none;
        margin: 0 auto;
    }

    .feature-text h2 {
        font-size: 1.5rem;
    }

    .experiment-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    }

    .experiment-types h3 {
        font-size: 1.1rem;
    }

    .footer-inner {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.75rem;
    }

    .hero-icon {
        width: 88px;
        height: 88px;
        border-radius: 22px;
    }

    .screenshot-fan {
        max-width: 360px;
        height: 380px;
    }

    .fan-card {
        width: 150px;
    }

    .fan-card:nth-child(1),
    .fan-card:nth-child(5) {
        opacity: 0.3;
    }

    .fan-card:nth-child(1) { transform: translate(-50%, -50%) translateX(-100px) rotate(-8deg); }
    .fan-card:nth-child(2) { transform: translate(-50%, -50%) translateX(-50px)  rotate(-4deg); }
    .fan-card:nth-child(3) { transform: translate(-50%, -50%) translateX(0px)    rotate(0deg);  }
    .fan-card:nth-child(4) { transform: translate(-50%, -50%) translateX(50px)   rotate(4deg);  }
    .fan-card:nth-child(5) { transform: translate(-50%, -50%) translateX(100px)  rotate(8deg);  }

    .mockup-img {
        border-radius: 28px;
    }

    .card-stack {
        width: 200px;
    }

    .experiment-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================================
   Legal Pages
   ============================================================ */

.legal {
    padding: 8rem 0 4rem;
    max-width: 680px;
    margin: 0 auto;
}

.legal h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.legal .updated {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 2rem;
}

.legal h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.legal p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.7;
}

.legal ul {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    padding-left: 1.25rem;
    line-height: 1.7;
}

.legal li {
    margin-bottom: 0.25rem;
}