:root {
    --bg-gradient: linear-gradient(180deg, #FFF5F7 0%, #F2F2F7 100%);
    --card-bg: #FFFFFF;
    --text-main: #1C1C1E;
    --text-sub: #8E8E93;
    --accent-red: #FF2D55;
    --accent-gradient: linear-gradient(135deg, #FF5E7E 0%, #FF2D55 100%);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-gradient: linear-gradient(180deg, #1A0A0C 0%, #000000 100%);
        --card-bg: #1C1C1E;
        --text-main: #FFFFFF;
        --text-sub: #A2A2A7;
    }
}

body {
    margin: 0;
    font-family: -apple-system, system-ui, sans-serif;
    background: var(--bg-gradient);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

header {
    padding: env(safe-area-inset-top) 25px 10px;
    margin-top: 40px;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 8px;
}

h1 {
    font-size: 34px;
    font-weight: 800;
    margin: 0;
    letter-spacing: -1px;
}

.heart-icon {
    font-size: 24px;
    animation: pulse 2s infinite;
}

.subtitle {
    font-size: 15px;
    color: var(--text-sub);
    margin: 5px 0 0;
}

#app {
    flex: 1;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

#menu-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 360px;
}

#menu-screen h2 {
    font-size: 24px;
    margin-bottom: 30px;
    color: var(--text-main);
}

.category-btn {
    width: 100%;
    padding: 20px;
    margin: 10px 0;
    background: var(--accent-gradient);
    color: white;
    border: none;
    border-radius: 20px;
    font-size: 18px;
    font-weight: 700;
    box-shadow: 0 8px 20px rgba(255, 45, 85, 0.3);
    cursor: pointer;
    transition: transform 0.2s ease;
}

.category-btn:hover {
    transform: scale(1.05);
}

.category-btn.completed {
    background: linear-gradient(135deg, #4CAF50 0%, #45a049 100%);
}

#game-screen {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#back-btn {
    align-self: flex-start;
    margin-bottom: 20px;
    background: var(--text-sub);
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 10px;
    font-size: 16px;
    cursor: pointer;
}

#stack-container {
    position: relative;
    width: 100%;
    max-width: 360px;
    height: 480px;
    margin: 0 auto;
}

.card {
    position: absolute;
    inset: 0;
    background: var(--card-bg);
    border-radius: 35px;
    padding: 35px;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    box-shadow: 0 5px 5px 5px rgba(255, 45, 85, 0.12);
    transition: transform 0.45s cubic-bezier(0.15, 0.3, 0.25, 1), opacity 0.3s ease;
    touch-action: none;
}

.card p {
    font-size: 26px;
    font-weight: 600;
    line-height: 1.35;
    margin: 0;
}

#empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 20px;
    position: absolute;
    top: 150px;
}

.finish-icon {
    font-size: 50px;
    margin-bottom: 20px;
}

.hidden {
    display: none !important;
}

.restart-btn {
    background: var(--accent-gradient);
    color: white;
    border: none;
    padding: 18px 40px;
    border-radius: 20px;
    font-size: 17px;
    font-weight: 700;
    box-shadow: 0 8px 20px rgba(255, 45, 85, 0.3);
    cursor: pointer;
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }

    100% {
        transform: scale(1);
    }
}

/* Styles for legal pages */
.legal-content {
    overflow-y: auto;
    padding: 40px 25px;
    max-width: 650px;
    margin: 0 auto;
    display: block;
}

.legal-content h2 {
    margin-top: 30px;
    font-size: 22px;
}

.legal-content a {
    color: var(--accent-red);
    text-decoration: none;
}