/* Arrow Trails - Dopamine style, background #fff */
:root {
    --bg: #ffffff;
    --dopamine-pink: #ff6b9d;
    --dopamine-blue: #4dabf7;
    --dopamine-green: #51cf66;
    --dopamine-yellow: #ffd43b;
    --dopamine-orange: #ff922b;
    --dopamine-purple: #cc5de8;
    --dopamine-cyan: #22b8cf;
    --text-dark: #212529;
    --text-muted: #495057;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.12);
    --radius: 16px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section-title {
    text-align: center;
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 2.5rem;
    color: var(--text-dark);
}

.section-title .emoji {
    display: inline-block;
    margin-right: 0.25rem;
}

section {
    padding: 4rem 0;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1rem 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    justify-content: center;
    align-items: center;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-menu a {
    color: var(--text-dark);
    font-weight: 600;
    font-size: 1rem;
}

.nav-menu a:hover {
    color: var(--dopamine-pink);
}

.nav-menu .btn-download {
    background: linear-gradient(135deg, var(--dopamine-pink), var(--dopamine-orange));
    color: white !important;
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
}

.nav-menu .btn-download:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-hover);
}

.nav-toggle {
    display: none;
    font-size: 1.5rem;
    color: var(--text-dark);
    cursor: pointer;
}

/* Hero */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 6rem 1.5rem 4rem;
    background: linear-gradient(135deg,
        rgba(255, 107, 157, 0.15) 0%,
        rgba(77, 171, 247, 0.12) 25%,
        rgba(81, 207, 102, 0.1) 50%,
        rgba(255, 210, 59, 0.12) 75%,
        rgba(255, 146, 43, 0.15) 100%);
    background-color: var(--bg);
}

.hero-content {
    max-width: 700px;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--dopamine-pink), var(--dopamine-orange), var(--dopamine-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero .tagline {
    font-size: 1.35rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 0.9rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background: linear-gradient(135deg, var(--dopamine-pink), var(--dopamine-orange));
    color: white;
    border: none;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.btn-secondary {
    background: var(--bg);
    color: var(--dopamine-blue);
    border: 2px solid var(--dopamine-blue);
}

.btn-secondary:hover {
    background: var(--dopamine-blue);
    color: white;
    transform: translateY(-3px);
}

/* Banner */
.banner {
    padding: 2rem 0;
    background: var(--bg);
}

.banner .container {
    max-width: 880px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.banner-image {
    width: 100%;
    max-height: 58vh;
    height: auto;
    display: block;
    object-fit: contain;
    vertical-align: bottom;
    border-radius: var(--radius);
}

/* Intro */
.intro {
    background: var(--bg);
}

.intro-content {
    max-width: 680px;
    margin: 0 auto;
    text-align: center;
    font-size: 1.15rem;
    color: var(--text-muted);
}

.intro-content strong {
    color: var(--dopamine-pink);
}

/* How to Play */
.how-to-play {
    background: linear-gradient(180deg, rgba(77, 171, 247, 0.08) 0%, var(--bg) 100%);
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
    max-width: 700px;
    margin: 0 auto;
}

.step-card {
    background: var(--bg);
    padding: 1.75rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border-left: 4px solid var(--dopamine-blue);
    transition: var(--transition);
}

.step-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.step-num {
    display: block;
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

.step-card p {
    color: var(--text-muted);
    font-size: 1.05rem;
}

/* Screenshots - 单行排列，高度自适应 */
.screenshots {
    background: var(--bg);
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1rem;
    margin-top: 1rem;
    align-items: stretch;
}

.screenshot-item {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
}

.screenshot-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.screenshot-item img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
    vertical-align: bottom;
}

@media (max-width: 768px) {
    .screenshots-grid {
        grid-template-columns: repeat(5, 1fr);
        gap: 0.75rem;
        overflow-x: auto;
        padding-bottom: 0.5rem;
        -webkit-overflow-scrolling: touch;
    }

    .screenshot-item {
        min-width: 0;
    }
}

/* Features */
.features {
    background: var(--bg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    padding: 2rem;
    border-radius: var(--radius);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
}

.feature-1 {
    background: linear-gradient(145deg, rgba(255, 107, 157, 0.12), rgba(255, 146, 43, 0.08));
    border: 1px solid rgba(255, 107, 157, 0.2);
}

.feature-2 {
    background: linear-gradient(145deg, rgba(77, 171, 247, 0.12), rgba(34, 184, 207, 0.08));
    border: 1px solid rgba(77, 171, 247, 0.2);
}

.feature-3 {
    background: linear-gradient(145deg, rgba(81, 207, 102, 0.12), rgba(255, 210, 59, 0.08));
    border: 1px solid rgba(81, 207, 102, 0.2);
}

.feature-emoji {
    font-size: 2rem;
    display: block;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.feature-1 h3 { color: var(--dopamine-pink); }
.feature-2 h3 { color: var(--dopamine-blue); }
.feature-3 h3 { color: var(--dopamine-green); }

.feature-card p {
    color: var(--text-muted);
    font-size: 1rem;
}

/* Download */
.download {
    background: linear-gradient(135deg, var(--dopamine-pink), var(--dopamine-orange));
    color: white;
    text-align: center;
}

.download .section-title {
    color: white;
}

.download-text {
    max-width: 560px;
    margin: 0 auto 2rem;
    font-size: 1.15rem;
    opacity: 0.95;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.btn-download-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background: rgba(255, 255, 255, 0.95);
    color: var(--text-dark);
    padding: 0.9rem 1.75rem;
    border-radius: var(--radius);
    font-weight: 600;
    transition: var(--transition);
}

.btn-download-cta i {
    font-size: 2rem;
}

.btn-download-cta span {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.btn-download-cta small {
    font-size: 0.7rem;
    opacity: 0.8;
}

.btn-download-cta strong {
    font-size: 1.1rem;
}

.btn-download-cta:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-hover);
}

/* Footer */
footer {
    background: var(--text-dark);
    color: white;
    padding: 3rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-logo h2 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(90deg, var(--dopamine-pink), var(--dopamine-yellow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-links h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: rgba(255, 255, 255, 0.9);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
}

.footer-links a:hover {
    color: var(--dopamine-pink);
}

.footer-links ul li {
    margin-bottom: 0.5rem;
}

.footer-contact h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: rgba(255, 255, 255, 0.9);
}

.footer-contact p {
    margin: 0;
}

.footer-contact a {
    color: rgba(255, 255, 255, 0.7);
}

.footer-contact a:hover {
    color: var(--dopamine-pink);
}

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

/* Mobile */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav-menu {
        position: fixed;
        top: 60px;
        left: -100%;
        width: 100%;
        flex-direction: column;
        background: var(--bg);
        padding: 2rem;
        box-shadow: var(--shadow-hover);
        transition: 0.3s;
    }

    .nav-menu.active {
        left: 0;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero .tagline {
        font-size: 1.15rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

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

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }

    .section-title {
        font-size: 1.5rem;
    }
}